Dissertations / Theses: 'Singlesided linear induction motor'

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Hu, Yifei. "Linear Induction Motor Investigation and Design for Articulated Funiculator." Thesis, KTH, Elektrisk energiomvandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177816.

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Articulated Funiculator is a new and innovative concept developed by Tyréns forachieving a more efficient vertical transportation with a higher space utilization.Having a variety of merits, i.e.: simple construction, direct electromagneticthrust propulsion, and high safety and reliability in contrast to rotary inductionmotor, linear induction motor (LIM) is considered to be one of the cases as thepropulsion system for Articulated Funiculator. The thesis is then carried outwith the purpose of determining the feasibility of this study case by designing theLIMs meeting some specific requirements. The detailed requirements include: aset of identical LIMs are required to jointly produce the thrust that is sufficientto vertically raise the moving system up to 2 m/s2; the size of the LIMs cannotexceed the specification of the funiculator; the maximum flux density in the airgap for each LIM is kept slightly below 0.6 T; no iron saturation of any part ofthe LIMs is allowed.In this thesis report, an introduction of LIM is firstly presented. Followingthe introduction, relevant literature has been reviewed for a strengthenedtheoretical fundamentals and a better understanding of LIM’s history and applications. A general classification of LIMs is subsequently introduced. In addtion,an analytical model of the single-sided linear induction motor (SLIM) has beenbuilt based on an approximate equivalent circuit, and the preliminary geometryof the SLIM is thereby obtained. In order to acquire a more comprehensiveunderstanding of the machine characteristics and a more precise SLIM design, atwo-dimensional finite element method (2D-FEM) analysis is performed initiallyaccording to the preliminary geometry. The results, unfortunately, turn out tobe iron severely saturated in the teeth and yoke, and a excessive maximumvalue of air-gap flux density. Specific to the problems, different parameters ofthe SLIM are marginally adjusted and a series of design scenarios are run inFlux2D for 8-pole and 6-pole SLIM. The comparisons between the results areconducted and the final solution is lastly chosen among them.
Articulated Funiculator är ett nytt och innovativt koncept som utvecklats av Tyréns för att möjilggöra en mer effektiv vertikal transport och bättre utnyttjautrymme. Tack vare fördelar såsom en enkel konstruktion, direkt elektromagnetiskdragkraftsframdrivning, samt hög säkerhet och tillförlitlighet i motsatstill roterande induktionsmotor, är en linjär induktionsmotor (LIM) aktuell somframdrivningssystem. Detta examensarbete är utfört med syfte att utforma enLIM för att uppfylla vissa specifika krav. De detaljerade kraven inkluderar: enuppsättning identiska LIM krävs för att gemensamt producera tillräcklig dragkraftför att vertikalt höja det rörliga systemet upp till 2 m/s2; storleken påLIM får inte överstiga specifikation; den maximala flödestätheten i luftgapet förvarje LIM hålls är begränsad till knappt 0.6 T; ingen järnmättnad av någon delav LIM är tillåtet. I denna rapport ges först en introduktion av LIM-konceptet. Efter introduktionenhar relevant litteratur granskats för att stärka teoretiska grundkunskapersamt ge en bättre belysning av historiken kring LIMs samt dess applikationer. Utöver detta har en analytisk modell av den ensidiga linjära induktionsmotorn(SLIM) byggts, baserat på en ungefärlig ekvivalent krets med vilket den preliminärageometrin för SLIM. För att erhålla en mer grundläggande förståelse avmaskinens egenskaper är en tvådimensionell analys med finita elementmetoden(2D-FEM) utförd, initialt med användande av en preliminär geometri erhållenmed hjälp av analytisk dimensionering. Resultaten från dessa simuleringar visadedock att järnet mättats kraftigt i både tänderna och oket och ett överdrivetstort maximivärde av luftgapets flödestäthet erhålls. Specifikt för applikationenjusteras olika parametrar och en rad driftscenarier körs i Flux2D för en 8-poligoch en 6-polig SLIM. En slutgiltig jämförelse mellan de olika maskindesignernapresenteras och den rekommenderade lösningen väljs slutligen.

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Manchen, Manfred Ludwig. "Shaded-pole flat linear induction motor." Thesis, Cape Technikon, 1990. http://hdl.handle.net/20.500.11838/1137.

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Thesis (Masters Diploma (Heavy Current)) -- Cape Technikon, 1991
Linear induction motors are built for numerous applications. Their robustness, gearfree-link to the load and the fact that speed is not a function of the number of poles (as in round machines) are only a few advantages. As every single phase motor needs some starting aid, so does a linear induction drive. For round machines, capacitors or shaded poles are usually used. A capacitor can be damaged electrically, which is a rare occurrence for shading rings. A useful combination of these advantages is a linear induction motor which is gearless and uses the shaded pole principle as a starting aid. In order to simplify the designing process, a computer program (Fortran) was written. The main objective on the electrical side was to obtain low input power, high power factor and high efficiency. In order to find the performance curves, torque measurements were made. Although the principles of torque measurements are well known the device to measure torque for this machine was not available and had to be constructed.

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Johnson, Andrew P. (Andrew Peter). "High speed linear induction motor efficiency optimization." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/10945/11052.

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CIVINS
CIVINS
One of the reasons linear motors, a technology nearly a century old, have not been adopted for a large number of linear motion applications is that they have historically had poor efficiencies. This has restricted the progress of linear motor development. The concept of a linear motor as a rotary motor cut and laid out flat with a conventional rotary motor control scheme as a design basis may not be the best way to design and control a high-speed linear motor. End effects and other geometry subtleties of a linear motor make it unique, and a means of optimizing efficiency with both the motor geometry and the motor control scheme will be analyzed to create a High-Speed Linear Induction Motor (LIM) with a higher efficiency than what is possible with conventional motors and controls. This thesis pursues the modeling of a short secondary type Double-Sided Linear Induction Motor (DSLIM) that is proposed for use as an Electromagnetic Aircraft Launch System (EMALS) aboard the CVN-2 1. Mathematical models for the prediction of effects that are peculiar to DSLIM are formulated, and their overall effects on the performance of the proposed machine are analyzed.;3 |a(cont.) These effects are used to generate a transient motor model, which is then driven by a motor controller that is specifically designed to the characteristics of the proposed DSLIM. Due to this DSLIM's role as a linear accelerator, the overall efficiency of the DSLIM will be judged by the kinetic energy of the launched projectile versus the total electric energy that the machine consumes. This thesis is meant to propose a maximum possible efficiency for a DSLIM in this type of role.

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Davidson, Innocent Ewean Agbongiague. "Performance analysis for a shaded-pole linear induction motor." Doctoral thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/21326.

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Bibliography: pages 129-148.
The induction motor remains the prime mover of present day industry with it's associated components in drive applications. In many such applications, fractional horse-power motors find ready use in small mechanisms where three-phase power supply is not available. In Southern Africa, these motors can be used is rural areas with simple reticulation systems, hence the renewed interest in the development of these low-power electrical motors, especially specialised models such as linear versions of such motors for special applications. This research is in the area of single-phase LIMs. The objective has been to model the shaded-pole LIM, in an attempt to enhance it's performance through improved design methods. This was carried out using an integrated analysis approach, involving circuital and field theory in the analysis of the practical motor, and computer simulation of it's equivalent model using the finite element method. Linear counterparts are possible for all the various forms of rotating electrical machines. All cylindrical machines can be 'cut' along a radial plane and 'unrolled' [32]. LIMs convert electrical energy directly into mechanical energy of translatory motion. Some advantages of linear version of induction motors are: they are gearless and often require minimal material thus minimising cost. While their scope of application are somewhat limited when compared to rotary versions, they do however give excellent performance in special situations where translator motion is required. However, the output power-to-mass and output power-to-volume of active materials ratio is reduced compared to rotary induction motors[45]. These disadvantages are caused by the large air-gap and the open magnetic circuit, which produces parasitical effects.

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Plodpradista, Wisuwat. "Study of tubular linear induction motor for pneumatic capsule pipeline system /." free to MU campus, to others for purchase, 2002. http://wwwlib.umi.com/cr/mo/fullcit?p3052209.

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Khiyo, Sargon, University of Western Sydney, of Science Technology and Environment College, and School of Engineering and Industrial Design. "Neuro/fuzzy speed control of induction motors." THESIS_CSTE_EID_Khiyo_S.xml, 2002. http://handle.uws.edu.au:8081/1959.7/554.

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The thesis involved the design, implementation and testing of a second order neuro-fuzzy controller for the speed control of an AC induction motor, and a comparison of the neuro-fuzzy controller's performance with that of the PI algorithm. It was found experimentally, that the operating temperature of the AC induction motor affected the ability of the PI controller to maintain the set speed. The linear PI algorithm approximation was observed to produce transient speed responses when sudden changes in load occurred. The neuro-fuzzy design was found to be quite involved in the initial design stages. However, after the initial design, it was a simple matter of fine-tuning the algorithm, to optimize performance for any parameter variations of the motor due to temperature or due to sudden changes in load. The neuro-fuzzy algorithm can be developed utilising one of two methods. The first method utilises sensor-less control by detailed modeling of the induction motor; where all varying parameters of the motor are modeled mathematically. This involves using differential equations, and representing them in the form of system response block diagrams. When the overall plant transfer function is known, a fuzzy PI algorithm can be utilised to control the processes of the plant. The second method involves modeling the overall output response as a second order system. Raw data can then be generated in a text file format, providing control data according to the modeled second order system. Using the raw data, development software such as FuzzyTECH is utilised to perform supervised learning, so to produce the knowledge base for the overall system. This method was utilised in this thesis and compared to the conventional PI algorithm. The neuro-fuzzy algorithm implemented on a PLC was found to provide better performance than the PI algorithm implemented on the same PLC. It provided also in the added flexibility for further fine-tuning and avoided the need for rigorous mathematical manipulation of linear equations
Master of Engineering (Hons)

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Bhamidi, Sarveswra Prasad. "Design of a single sided linear induction motor (SLIM) using a user interactive computer program." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4308.

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Thesis (M.S.)--University of Missouri-Columbia, 2005.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (May 26, 2006) Includes bibliographical references.

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Anand, Vivek. "Modelling and Control of a Dual Sided Linear Induction Motor for a scaled Hyperloop Pod." Thesis, KTH, Fordonsdynamik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-285801.

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The electrification era has been marked up by an increase in volume of electric vehicles which are directly or indirectly powered by electricity. Railways, roadways and airways are being electrified as we speak at their own respective rate. In addition to that upcoming concepts for transport solution such as hyperloop also described as the fifth mode of transportation will be electrified. The current thesis work is based on developing the model and control of the propulsion system of a scaled Hyperloop pod designed by student team KTH Hyperloop representing KTH. The team competes in Hyperloop competition organized by Spacex and the goal is to achieve the highest possible speed in a given distance and track designed by SpaceX. In order to achieve the goal of being the fastest, the scaled pod uses a Double Sided Linear Induction Motor (DSLIM) as mentioned in the subsequent chapter. The motor modelling is done on Simulink and is similar to a rotary induction motor (RIM). However the presence of end effect in DSLIM makes it different from RIM and has been discussed subsequently. The control strategy uses a synchronous frame PI control for the current control and sensor based speed control for controlling the speed of the pod.The speed control output is a reference current which is used as an input to the current controller which finally gives voltage as the control output. The corresponding bandwidth for the various loops have been calculated based on motor parameters as discussed in the method section. The validation of the motor model and the corresponding controller has been discussed in the result section, where the accuracy of the controller for the designed modelled is discussed.
Elektrifieringstiden har präglats av en ökning i volym av elfordon som direkt eller indirekt drivs med el. Järnvägar, vägar och luftvägar elektrifieras just nu med deras respektive takt. Utöver det kommer kommande koncept för transportlösning som hyperloop som också beskrivs som det femte transportsättet att elektrifieras. Detta examensarbete bygger på att utveckla modellen och regleringen av framdrivningssystemet för en nedskalad Hyperloop-pod utvecklad av studentteamet KTH Hyperloop som representerar KTH. Teamet tävlar i Hyperloop-tävlingen organiserad av SpaceX och målet är att uppnå högsta möjliga hastighet på ett visst avstånd och spår framtaget av SpaceX. För att uppnå målet om att vara snabbast använder den nedskalade podden en dubbelsidig elektrisk linjär induktionsmotor (DSLIM) som nämns i det följande kapitlet. Den elektriska motormodelleringen görs i Simulink och liknar en roterande induktionsmotor(RIM). Men närvaron av ’end effect’ i DSLIM gör den annorlunda än RIM och har diskuterats därefter. Styrstrategin använder en synkron ram-PI-styrning för strömstyrning och sensorbaserad hastighetsreglering för att styra hastigheten på podden. Varvtalsstyrningsutgången är en referensström som används som en ingång till den nuvarande styrenheten som slutligen ger spänning som slutling styrning. Motsvarande bandbredd för de olika slingorna har beräknats baserat på elektriska motorparametrar som diskuterats i metodavsnittet.Valideringen av elmotormodellen och motsvarande styrenhet har diskuterats i resultatsektionen, där noggrannheten hos styrenheten för den konstruerade modellerna diskuteras.

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Joshi, Makarand Madhav. "A user interactive design procedure for an efficient tubular linear induction motor for pneumatic capsule pipeline systems." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/5910.

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Thesis (M.S.)--University of Missouri-Columbia, 2006.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (February 26, 2007) Includes bibliographical references.

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Alvarenga, Bernardo Pinheiro de. "Proposta de aplicação de motor de indução linear tubular na extração de petróleo." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-10032004-092604/.

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O presente trabalho apresenta o desenvolvimento de um protótipo de motor de indução linear tubular para aplicação na extração de petróleo. A principal função do motor é acionar diretamente uma bomba de sucção instalada no fundo de um poço em terra. São estabelecidas as diretrizes de projeto elétrico do motor, em conjunto com uma análise preliminar baseada na teoria convencional das máquinas elétricas. Propõe-se a aplicação do método das matrizes de transmissão para obter um modelo analítico mais preciso do motor de indução linear tubular. Também é apresentado o modelo obtido pela aplicação do Método dos Elementos Finitos. Os resultados dos modelos teóricos convencional e matricial são confrontados com os resultados do modelo por Elementos Finitos e de testes, mostrando boa concordância. De maneira geral, os resultados indicam que o motor tubular pode substituir com vantagens o sistema mecânico de superfície e o conjunto de hastes utilizados na extração de petróleo.
This report presents the development of a tubular linear induction motor for oil well applications. The aim of the motor is to directly drive an on-shore downhole piston pump with no rods. Guidance to the electric and magnetic design of the motor is established. Two forms of analysis are proposed: the rotating electrical machines (conventional) based and the transmission matrix based. A model using the Finite Element Method is also described. Conventional and matricial solutions are compared to the Finite Element and tests results, showing good agreement. In a general sense, the work results show that the tubular motor may substitute the mechanical surface system and the rod string with advantage.

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Costa, Eduardo Alves da. "Mancal magnético ativo aplicado a um motor de indução linear tubular." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-21122009-131641/.

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O Motor Assíncrono Tubular para Aplicação na Extração de Óleo do Subsolo MATÆOS foi desenvolvido na Escola Politécnica da Universidade de São Paulo (EPUSP) com a função de acionar diretamente uma bomba de sucção, instalada no fundo de um poço de petróleo em terra. Dando continuidade aos trabalhos realizados na EPUSP envolvendo sistemas de levitação magnética, foi desenvolvido um mancal magnético ativo (AMB - Active Magnetic Bearing), aplicado ao protótipo do motor em substituição ao mancal mecânico tradicional existente. O projeto abrange a construção de um protótipo de mancal magnético composto das partes mecânicas, elétricas e de software necessárias ao funcionamento do sistema. O projeto do eletroímã foi realizado por meio do método dos elementos finitos (MEF), para análise da densidade de fluxo e da relação entre a força radial e a corrente elétrica nas bobinas. O controle da levitação do mancal é realizado por meio de controlador digital com placas conversoras AD/DA e algoritmo de controle implementado em hardware FPGA. Utilizando o modelo do sistema, os controladores são sintonizados para atender aos requisitos de estabilidade e rejeição de perturbações, que desviem o entreferro do seu valor nominal. Na configuração do AMB, ao invés do sistema tradicional com oito pólos, um conceito diferente é adotado. Neste, uma máquina primitiva bearingless é excitada com corrente contínua e usada como mancal magnético. Os resultados experimentais obtidos com o protótipo em funcionamento mostram que o sistema em malha fechada é estável e apresenta uma resposta transitória satisfatória.
A tubular linear induction motor applied to onshore oil exploitation, named MATÆOS (which is in the Portuguese acronym for Tubular Asynchronous Motor for Onshore Oil Exploitation) was built at Escola Politécnica da Universidade de São Paulo (EPUSP). Its purpose is to directly drive the sucker-rod pump installed in the down hole of the oil well. In continuing the research accomplished at EPUSP concerning magnetic levitation systems, an Active Magnetic Bearing (AMB) was developed and applied to the prototype of the motor in substitution to the existing traditional bearing. The design includes the construction of the magnetic bearing prototype composed of mechanical, electric and software components required to the operation of the system. The electromagnet design was accomplished using the Finite Element Method (FEM) in the analysis of both the flux density and the relationship between the radial force and the suspension winding current. The magnetic bearing levitation control is executed by a digital controller using an AD/DA converter and a control algorithm implemented in FPGA hardware. Using the system model, the controllers are tuned to provide both stability and rejection of disturbances that tend to move the air gap from its nominal value. Instead of the usual eight-pole AMB, a different concept is adopted where a DC-excited primitive bearingless machine is used as a magnetic bearing. The experimental results obtained with the prototype in operation show that the closed-loop system is stable and exhibits a satisfactory transient response.

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Treviso, Felipe. "Estudo de um atuador planar de indução para a inspeção de superfícies metálicas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/141822.

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Um atuador planar de indução é um dispositivo baseado no mesmo princípio de funcionamento de um motor linear de indução, onde a interação de um campo magnético viajante produzido pelo primário do dispositivo com uma superfície de boa condutividade elétrica induz correntes parasitas que levam à produção de uma força de propulsão. O movimento planar sobre essa superfície é produzido através da movimentação linear em dois eixos ortogonais. Uma aplicação deste movimento é na propulsão de uma plataforma equipada com câmeras e sensores para a realização da inspeção em uma superfície metálica, que se beneficiaria da força normal que o motor planar de indução produz quando acionado sobre uma superfície ferromagnética para anexar a plataforma à superfície. Um modelo analítico que fornece equações para o campo elétrico e magnético é apresentado, e simulações numéricas baseadas no método dos elementos finitos são realizadas para avaliar o comportamento do dispositivo utilizando três tipos diferentes de superfícies como secundário: um secundário com duas camadas formadas por uma chapa de alumínio com outra de aço por baixo; apenas a chapa de alumínio; e apenas a chapa de aço. As distribuições de campo magnético calculadas por estes dois modelos teóricos mostram boa concordância entre si, e são utilizadas para calcular as forças de propulsão e normal produzidas pelo atuador. Medidas experimentais são realizadas em um protótipo de atuador planar de indução, e seus resultados são comparados com os resultados obtidos nos modelos teóricos, mostrando uma boa concordância e potencial para a aplicação do atuador planar de indução na inspeção de superfícies horizontais.
An induction planar actuator is a device that, based on the operating principle of a linear induction motor, in which the interaction between a travelling magnetic field produced by the primary of the device and a conducting surface generates eddy currents in the surface and leads to the generation of a thrust force. The device produces planar motion over this surface through movement on two orthogonal axis. An application of this movement is in a platform for the inspection of metallic surfaces, which is driven by the planar induction motor and equipped with cameras and sensors to inspect the surface. This application benefits from the normal force produced by the induction planar actuator operating over a ferromagnetic surface to attach the driving platform to it. An analytical model with equations for the electric and magnetic fields is presented, and numerical simulations based on the finite element method are carried out to assess the behaviour of the device using three different surfaces as secondary: a double-layered secondary formed by an aluminum plate over a steel plate; a aluminum only plate; and a single steel plate. The distributions for the magnetic field computed through these theoretical models show good agreement, and are employed to evaluate the thrust and normal forces produced by the planar induction actuator. Experimental measurements are made on a prototype of the device, and the results are compared to the results of the theoretical models, showing good agreement and potential in the application of the induction planar motor for the inspection of horizontal metallic surfaces.

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Filho, Geraldo Macias Martins. "Estudo do motor de indução linear utilizado como posicionador e simulações computacionais." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-26052017-111516/.

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Desde a idealização das máquinas elétricas girantes, o motor de indução linear (MIL) fora também considerado viável e, ao longo do tempo, foi pesquisado e foram desenvolvidas novas tecnologias para sua melhoria e para o seu acionamento. Muitos trabalhos acadêmicos foram realizados em todos os centros de pesquisa do mundo e, no Brasil, os primeiros a estudá-lo com rigor científico foram os professores Morency Arouca e Délio Pereira Guerrini, no início da década de 70, no departamento de Engenharia Elétrica da EESC/USP. Até hoje no Brasil, pouco se desenvolve neste campo de estudo da Engenharia Elétrica e, quando se desenvolve, ficam restritos à simulações e levantamentos de parâmetros característicos aos MIL\'s específicos. O presente trabalho tem como objetivo fazer uma explanação teórica e matemática que servirá de base ao estudo e compreensão do MIL e propor uma aplicação ao mesmo: o MIL acionado por inversor de freqüência e utilizado para obtenção de posicionamento com auxílio de simulação computacional de algumas malhas de controle para tal posicionamento.
Since the rotating machines had been idealized, the Linear Induction Motor (LIM) has been researched and, along the time, new technologies are being developed in order to improve it. Many academic works were accomplished in several research centers and universities around the world. In Brazil, the first ones to study it with scientific approach were Professors Morency Arouca and Délio Pereira Guerrini, in the early 70\'s. Even nowadays, works are seldom developed, and most of them are dedicated to simulation of the LIM or obtaining of parameters of specific LIM\'s. The present work has as objective to study the mathematical and theoretical modeling, which will be used as basis in order to study and understand the LIM and to propose an application: the LIM fed by Frequency Inverter, used in order to obtain positioning, with simulation of specific control systems.

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Alves, Thiago Berger Canuto. "Análise da força propulsora do motor de indução linear alimentado com imposição de corrente." Universidade Federal de Uberlândia, 2016. https://repositorio.ufu.br/handle/123456789/17713.

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O presente trabalho tem como objetivo estudar a força propulsora proveniente do motor de indução linear plano, na condição de bloqueio. Utiliza-se um método de imposição de correntes elétricas ao estator através de um conversor de frequência PWM acionado por uma plataforma realimentada. A leitura da força propulsora foi realizada através de uma célula de carga utilizando um circuito eletrônico para leitura e condicionamento do sinal. Visando a análise completa do motor linear, foi realizado uma modelagem computacional que emprega todos os parâmetros relevantes ao estudo da máquina bloqueada. Ao final realizou-se um confronto teórico experimental que avaliou a eficiência do método proposto.
This work intent to study the motive power provided by the plane linear induction motor, in a lock condition. It uses a method of imposition of the electric current to the stator via a frequency convertor PWM driven by a refed platform. The reading of the motive power was performed by a load cell using an electronic circuit for reading and conditioning of the signal. Aiming a complete analysis of the linear motor, it was performed a computational modeling that employs all relevant parameters to the study of the locked machine. At the end it was held a theoric-experimental confrontation that evaluated the effectiveness of the proposed method.
Dissertação (Mestrado)

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Soares, Matheus Garcia. "Motor de indução linear bloqueado - obtenção da força desejada através de alimentação não senoidal." Universidade Federal de Uberlândia, 2012. https://repositorio.ufu.br/handle/123456789/14534.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico
The objective of this work is to apply a heuristic method to optimize the choice of parameters of unbalanced input voltages of a linear induction motor at low speeds.The mathematical model developed for the linear induction motor considers his linor blocked, aiming applications at low speeds. Applying a genetic algorithm program the magnitude of unbalance of the input voltage of the linear motor can be determine.The experimental results are compared satisfactorily with practical tests conducted with a prototype of the linear machine.
O objetivo deste trabalho é aplicar um método heurístico para otimizar a escolha dos parâmetros de desbalanceamento das tensões de entrada de um motor de indução linear em baixas velocidades. O modelo matemático desenvolvido para o motor de indução linear considera o seu linor bloqueado, visando aplicações em baixas velocidades. Através da aplicação de um programa de algoritmo genético é possível determinar a magnitude dos desbalanceamentos das tensões de entrada do motor linear. Os resultados experimentais obtidos são confrontados de forma satisfatória com os testes práticos realizados com um protótipo da máquina linear.
Mestre em Ciências

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Paškonis, Deividas. "Valdomosios tiesiaeigės stūmiklio pavaros tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110617_190807-90292.

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Šiame baigiamajame darbe tiriamas elektriškai ir magnetiškai dvipusio tiesiaeigio asinchroninio variklio (TAV) valdymo būdas, keičiant vieno iš induktorių maitinimo įtampos fazę kito induktoriaus maitinimo įtampos fazės atžvilgiu. Įvade suformuluotas darbo tikslas ir paminėtos TAV taikymo galimybės. Atlikta literatūros šaltinių analizė ir apžvelgti tiesiaeigiai asinchroniniai varikliai bei jų konstrukcijos. Pateikti šių variklių privalumai, trūkumai ir panaudojimo sritys. Teorinėje dalyje išanalizuotos tiesiaeigės stūmiklių pavaros ir apžvelgti specialūs tiesiaeigių variklių valdymo būdai. Išanalizuotos statinės charakteristikos ir sudaryta skaičiavimo metodika. Tiriamojoje dalyje sudarytas TAV modelis ir imituotos dinaminės charakteristikos. Pagamintas ir išbandytas TAV bandymų stendas, pateiktos išvados. Pasiūlyta tiesiaeigės stūmiklio pavaros funkcinė ir elektrinė principinė schemos. Darbą sudaro 7 dalys: įvadas, literatūros analizė, tyrimo tikslas ir uždaviniai, tiriamoji dalis eksperimentinė dalis, tyrimo rezultatų apibendrinimas, literatūra ir kt. šaltiniai. Darbo apimtis – 70 p. teksto be priedų, 49 iliustr., 3 lent., 24 bibliografiniai šaltiniai.
Electrically and magnetically control mode of two-sided linear induction motor (LIM) is analysed in this thesis. It is done by changing one of the voltage power supply inductor phase regard to next phase inductor. The main goal of thesis and LIM application possibilities are formulated in introduction. Literature review and analysis of linear induction motors and their construction was accomplished. The use of energy, main advantages and disadvantages of these motors were represented. Special control techniques, analysis of linear pushing drives and linear motors were analysed in theoretical section. LIM static characteristics and calculation methodology is provided in this section either. In the research section consist of LIM mathematical model, where dynamic characteristics are simulated. The actual LIM model was made and tested, experiment conclusions were written. The linear spindle drive functional and electrical diagrams were proposed. The work consists of seven sections: introduction, literature review, the study of aims and objectives, experimental section, investigating LIM and providing results, literature and others sources. Work size - 70 p. text without appendixes, 49 pictures., 3 tables., 24 bibliographic sources.

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17

Gong, Jinlin. "Modélisation et conception optimale d’un moteur linéaire à induction pour système de traction ferroviaire." Thesis, Ecole centrale de Lille, 2011. http://www.theses.fr/2011ECLI0016/document.

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Cette thèse porte sur l’étude des performances du moteur linéaire de référence par la méthode d’analyse éléments finis, et la conception optimale sur un modèle lourd en temps de calcul. La méthode éléments finis est utilisée pour étudier les performances du moteur linéaire de référence, car le modèle analytique d’un moteur linéaire est difficile à construire dû aux effets d’extrémités. Le modèle éléments finis (MEF) 2D permet de prendre en compte l’effet d’extrémité de longueur finie. L’effet d’extrémité de largeur finie est intégré au modèle 2D en faisant varier la conductivité du secondaire et en ajoutant une inductance de tête de bobines. Ensuite, le couplage entre le MEF 3D magnétique et thermique permet de prendre en compte tous les effets d’extrémité et de l’influence de la température. Un banc d’essais est construit pour valider les modélisations éléments finis. La comparaison entre les différents modèles montre l’importance du modèle couplé. L’optimisation directe sur un MEF est très couteuse en temps de calcul. Les stratégies d’intégrer un modèle de substitution au lieu d’un MEF sont étudiées. L’optimisation directe sur un modèle de substitution et l’algorithme Efficient Global Optimisation (EGO) sont comparés. Un algorithme Space Mapping (SM) 3 niveaux est proposé. Les résultats des cas tests montrent que le SM 3 niveaux est plus efficace par rapport à l’algorithme SM 2 niveaux. Une nouvelle stratégie d’optimisation avec un faible budget d’évaluation du MEF est proposée et testée dans le contexte d’une modélisation difficile. La stratégie proposée permet d’évaluer les MEF en parallèle, ainsi permet un gain considérable de réduction du temps d’optimisation
This thesis focuses on studying the performance of the linear induction motor using the method of finite element analysis, and the optimal design on a time-costly model. The finite element method is used to study the performance of the linear induction motor. Firstly, the 2D finite element model (FEM) is constructed, which allows taking into account the longitudinal end effects. The transverse edge effects are taken into account within 2D model by varying the conductivity of the secondary and by adding the inductance of the winding overhang. Secondly, a coupled model between the magnetic and thermal 3D FEM is built which allows taking into account both the end effects and the temperature influence. Finally, a test bench is realized to validate the models. The comparison between the different models shows the importance of the coupled model. Optimal design using finite element modeling tools is a complex task and also time-costly. The surrogate model-assisted optimization strategies are studied. The direct surrogate model-assisted optimization and the Efficient Global Optimization are compared. A three-level output space-mapping technique is proposed to reduce the computation time. The optimization results show that the proposed algorithm allows saving a substantial computation time compared to the classical two level output space-mapping. Using the 3D FEM, a multi-objective optimization with a progressive improvement of a surrogate model is proposed. The proposed strategy evaluates the FEM in parallel. A 3D Pareto front composed of the finite element model evaluation results is obtained, which allows taking the decision for the engineering design

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Monaco, Leandro Henrique. "Controle de sistema de mancais magnéticos ativos para um motor de indução linear tubular." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-16072013-171723/.

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Para aplicações de extração de petróleo de poços em terra foi desenvolvido pelo Laboratório de Eletromagnetismo Aplicado (LMAG) da Escola Politécnica da Universidade de São Paulo um protótipo de motor de indução linear tubular (MILT), onde o movimento axial do secundário do motor aciona diretamente a bomba de extração situada no fundo do poço. Numa segunda etapa, foi prevista a substituição dos mancais mecânicos por dois mancais magnéticos ativos (AMBs), que permitem melhor movimentação e praticamente nenhum atrito, reduzindo o desgaste causado por impurezas contidas no petróleo extraído, e consequentemente os esforços de manutenção. Todavia, o protótipo atual possui apenas um mancal magnético, e o outro é mecânico. O presente trabalho apresenta a instalação do segundo mancal magnético ao protótipo do MILT, e propõe realizar o controle do sistema de mancais magnéticos para o MILT, tendo em vista um problema multivariável, onde as posições do secundário do motor em relação aos dois mancais são correlacionadas, bem como as ações de controle sobre os mesmos. O trabalho faz uma revisão do sistema atual com um AMB, abordando sua concepção física, modelagem e o controlador, e tal controlador é replicado para o segundo AMB. Um novo modelo é apresentado, considerando o comportamento multivariável dos dois AMBs, e um sistema de controle robusto multivariável é projetado, através da técnica LQG/LTR. Resultados de simulação do novo controlador são analisados e comparados com os resultados experimentais do controlador atual aplicado aos dois AMBs, e apresentam-se as conclusões.
For onshore oil extraction applications, a tubular linear induction motor (TLIM) prototype was developed by Applied Electromagnetism Laboratory (LMAG) of Escola Politécnica da Universidade de São Paulo, on which the axial movement of the motor secondary drives the suction pump, placed in the down hole of the oil well. In a second step, it was planned to replace the mechanical bearings by two Active Magnetic Bearings (AMB), in order to have better movement and practically no friction, reducing damages caused by impurities in the oil, thus reducing maintenance effort. Nevertheless, the actual prototype has only one AMB, being the other one a mechanical bearing. This paper presents the installation of the second AMB onto TLIM prototype, and a proposal to implement the control algorithm for the TLIM magnetic bearing system, considering now a multivariable problem, where the position of the motor secondary for both AMB are related, as well as control efforts. The present work review the actual system with only one AMB, approaching its physical construction, mathematical model and applied control system; and this control system is applied to the second AMB. A new model is presented, considering the AMB system multivariable behavior, and a multivariable robust control system is then designed, using LQG/LTR approach. Simulation results for the new controller are analyzed and compared to experimental results from the actual controller applied to both AMB, and some conclusions are presented.

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Rossini, Wagner Marques. "Identificação de parâmetros de motor de indução linear tubular para extração de petróleo." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-02062008-171921/.

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O presente trabalho apresenta a identificação de parâmetros de motor de indução linear tubular para a extração de petróleo, denominado de MATÆOS -- Motor Assíncrono Tubular para Aplicação na Extração de Óleo Subterrâneo. O primeiro passo para a identificação de parâmetros do motor foi a implementação da bancada de testes com o seu sistema de controle e supervisório. O modelo adotado corresponde à situação de operação em regime estacionário e consiste no circuito contendo resistores e indutores tradicionalmente utilizado para representar motores de indução. A identificação dos parâmetros foi realizada por meio de um procedimento de otimização tomando por base o balanço de potência do motor. Para isso, em função dos parâmetros do modelo, definiu-se e minimizou-se uma medida de erro entre as potências medidas e as calculadas pelo modelo para um conjunto pré-fixado de escorregamentos. A solução desse problema de otimização foi obtida por meio de uma busca exaustiva, uma vez que o número de variáveis independentes do problema é pequeno e uma região contendo o ponto de mínimo é conhecida com razoável confiança. Os resultados obtidos indicam que os valores dos parâmetros nominais a quente apresentam algumas diferenças em relação àqueles produzidos pelo método de identificação. Essas diferenças se devem possivelmente a variações nas características térmicas do motor e a erros introduzidos pelos instrumentos de medida. O modelo identificado apresentou uma menor disponibilidade de força e um pior rendimento quando comparado com os valores de projeto do modelo nominal a quente. Apesar disto, verificou-se uma boa proximidade entre a curva característica do modelo e as obtidas experimentalmente.
This work presents the identification of parameters of the tubular linear induction motor for the extraction of oil, called MATÆOS - which is the Portuguese acronym for Asynchronous Tubular Motor for Application to Subterranean Oil Extraction. The first step to the identification of the motor parameters was the implementation of the supervisory and control system for the test bench. The model, which is the usual one containing resistors and inductors, represents the motor operating in steady-state. The parameter identification problem was written as an optimization problem based on the motor power balance. An error between the measured power and the one given by the model was defined and minimized with respect to the model parameters in correspondence to a given set of slipping frequencies. The numerical solution to this problem was obtained by an exhaustive search algorithm. This choice was made because the number of independent variables is small and a region containing the solution is known with a significant degree of confidence. The results obtained show that the nominal values of the model parameters differ slightly from those produced by the identification method. Possibly, such differences are due to the variations in the model caused by temperature changes and to the measurement errors. The identified model presented both a lower available force and a worst efficiency when compared to the nominal design values for the warm motor. Despite this the characteristic curve of the model was quite close to the nominal design one.

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20

Ortunho, Tiago Veronese [UNESP]. "Projeto de controladores robustos para acionamento de um motor de indução trifásico." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/134247.

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Nesta dissertação apresentam-se o princípio de funcionamento do motor de indução trifásico em regime permanente abordando os ensaios necessários para obtenção de seus parâmetros e as diferentes possibilidades de variação de velocidade. A partir disso, efetuou-se uma análise da modelagem dinâmica do motor, enfocando nas transformações de eixos, além de analisar os tipos de controle, escalar, vetorial direto e indireto (orientado pelo fluxo do rotor, pelo fluxo do estator e pelo fluxo do entreferro) e o controle direto de torque. Também se abordou os conversores CC - CA utilizados para o acionamento do motor de indução trifásico, juntamente com suas principais metodologias de modulação. Fez-se uma revisão do estado da arte dos sistemas de acionamento e controle mais estudados nos últimos anos sobre o assunto. Após, estudou-se os conceitos de estabilidade quadrática proposto por Lyapunov, juntamente com o controle H∞, os quais foram a base para o desenvolvimento de controladores robustos projetados no trabalho com desigualdade matriciais lineares (em inglês Linear Matrix Inequalities (LMIs)). Desenvolveram-se cinco tipos de controladores robustos com LMIs: o robusto, com taxa de decaimento (para sigma 1 e 10), H∞, H∞ com D-Estabilidade e H∞ com D-Estabilidade e realimentação da integral do erro de saída sendo que em todos o motor de indução trifásico foi orientado pelo fluxo do rotor. Os controladores foram projetados para quatro diferentes configurações, sendo considerados, primeiro caso - variação da velocidade (5 rad/s até a nominal); segundo caso - variação da velocidade e incerteza na resistência rotórica (3%); terceiro caso - variação na velocidade e incerteza na constante de tempo do rotor (5%); quarto caso - variação na velocidade e incertezas na constante de tempo do rotor (15%) e do estator (10%). Em todos os controladores projetados foram analisadas a resposta no tempo das saídas para uma entrada degrau unitário de distúrbio do torque de carga. Esta análise objetivou avaliar o comportamento do sistema, porém, para emular o sistema com maior fidelidade, foi montado no software Matlab/Simulink uma plataforma que contém o conjunto completo de acionamento, sistema de potência e controle, com alimentação trifásica, retificador de onda completa, barramento CC – CC, conversor CC – CA, motor de indução de indução trifásico e sensores. Esta plataforma possibilita desenvolver diversos testes no acionamento do motor de indução, além de facilitar a implementação e coleta de resultados com outras topologias de controladores. Nesta plataforma foram desenvolvidas simulações para o sistema sem carga e após 1,5 segundos aplicava-se um degrau de carga nominal no motor. Nesta plataforma analisaram-se o sistema em malha aberta com intuito de entender o comportamento do motor e, em malha fechada, foi simulado o sistema para os quatro casos de análise considerando os seis controladores robustos e o sistema com o controle clássico PI. Nas simulações foram observadas diversas formas de onda, as quais foram comparadas com os resultados do sistema em malha aberta e do controle PI. Os melhores resultados foram obtidos para os controladores H∞ com D-Estabilidade e H∞ com D-Estabilidade e realimentação da integral do erro de saída, pois, seguiram a referência de velocidade solicitada com um tempo de estabelecimento relativamente pequeno. Evidencia-se a viabilidade dos controladores e a possibilidade da implementação em bancada e ambiente industrial, os quais proporcionarão maior confiabilidade ao sistema de acionamento.
This research shows the steady state operating principle of triphasic induction motors to approach the tests necessary to obtain their parameters and different speed variation possibilities. After were performed an analysis of the dynamics of motor modeling, focusing on the transformation of axes, and analyzing the types of control, scalar, direct and indirect vector (guided by the rotor flux at the stator flux and flux air gap) and direct torque control. The converters CC – AC used to drive the induction motor are also aborded, along with their main methods of modulation. A review of the state of the art regarding the drives and control systems most studied in recent years on the subject is presented. After were studied the concepts of quadratic stability proposed by Lyapunov, together with the H∞ control, which were the basis for the development of robust controllers based on Linear Matrix Inequality (LMI). In this research were developed five types of robust controllers with LMI: the robust controller, the controller with decay rate (for sigma 1 and 10), H∞ controller, H∞ controller with D- Stability and H∞ controller with D- Stability and feedback the integral of output error, considering in all cases that the triphasic induction motor is driven by rotor flux. The controllers were designed for four different configurations and were considered the first case - the speed variation (5 rad/s up to the rated); second case - the speed variation and uncertainty in the rotor resistance (3%); third case - variations in speed and uncertainty in the rotor time constant (5%); fourth case - variations in speed and uncertainties in the rotor time constant (15%) and the stator (10%). In all researched controllers were analyzed the response time of the outputs for a unit step input load torque disturbance. This analysis aimed to evaluate system behavior, however, for a complete and rigorous analysis of the system, with greater fidelity, was set up in Matlab/ Simulink software a platform that contains the full set of drive, power and control system with three-phase power, full-wave rectifier, bus DC – DC, converter DC – AC, three-phase induction motor and sensors. This platform allows the simulation of various tests with induction motor drive, and also the implementation and result analysis using a broad class of controllers. Simulations of the system without load and considering a nominal engine load step applied after 1.5 seconds are presented. In this program were analyzed the open-loop system with the aim of understanding the motor behavior, and the closed loop system was simulated considering four cases, six robust controllers and the classic PI controller. The simulations display the waveforms of triphasic current and the line voltage of the MIT, the triggers for inverter drive, currents and voltages of the direct-axis and quadrature, the electromagnetic torque and speed. The best results were obtained for the H∞ controllers with D-Stability and H∞ with D-Stability and feedback of the integral of output error. The feedback system with this controller tracked the speed reference with a small setting time. Based on this results it is possible the application of this control technique in industrial environments.

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21

Pařízek, Jiří. "Analýza a optimalizace energetických parametrů asynchronních strojů malého výkonu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219004.

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This thesis deals with the asynchronous engines, describes their structure, principles, properties, use, and briefly describes the design of three-phase asynchronous motor. The first section describes the most common three-phase induction motor, the emergence of the rotating magnetic field and the basic relationships. The second part deals with asynchronous motors for specific applications, their design and features. The next section is an analysis engine borrowed from the electric company ATAS Náchod, and The last section lists ways to improve the basic parameters of induction motors designed and optimized engine.

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Belica, Andrej. "Speciální asynchronní motory malého výkonu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242131.

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Master thesis deals with design and construction of the most widely used engines currently. Overall, it is divided into five chapters, the first chapter deals with constructional features of various three-phase asynchronous motors, the second chapter briefly paid attention to single-phase motors. The next chapter focuses on the specific engine types, which differ from standard induction motors in its design implementation. This is an engine with full rotor, hysteresis, linear and with shaded field. Although asynchronous motors are considered the most reliable machines work in imperfect conditions, it leads to frequent breakdowns. This is covered in chapter four. Based on the findings from previous chapters the fifth chapter includes a preliminary draft of the asynchronous motor with a full rotor. The last chapter is devoted to the measurement on functional models.

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23

Geglis, Andžej. "Tiesinio asinchroninio variklio valdymo būdų modeliavimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2005. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20050620_141025-41632.

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The analysis of the feature and application of linear induction motors at work have been performed; mathematical models of linear motors have been studied; mathematical description of induction machine have been presented; coordinate transform have been studied; dynamic equations in moving and move-less systems of axes of linear induction motor have been presented; the analysis of the classification of induction drives control modes have been performed. Four models of the frequency-regulated electric drives with linear induction motors have been studied: when the motor is supplied from variable frequency mains supply, when the motor is supplied from frequency converter, when frequency is changed by program, when frequency is changed in close-loop by vector control system. The characteristics of those models have been compared and performed. The received results are summarized in the conclusions.

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Šveistys, Valdas. "Elektros pavaros su tiesiaeigiu asinchroniniu varikliu tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080930_090631-03888.

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Baigiamajame magistro darbe nagrinėjama elektros pavaros su tiesiaeigiu asinchroniniu varikliu konstrukciniai ypatumai, savybės, mechaninės charakteristikos bei kokybės rodikliai. Programiniu paketu MathCAD 2001 Professional yra sudarytas matematinis tiesiaeigio asinchroninio variklio modelis. Tyrimas atliekamas eksperimentiniu būdu, keičiant TAV parametrus (Reynoldso skaičių, neferomagnetinį sluoksnį, oro tarpą, induktoriaus plotį, variklio apvijų skaičių ir pan.), gaunamos tam tikram modeliui būdingos mechaninės charakteristikos. Magistro darbe pateikiama bendra elektros pavarų su tiesiaeigiais asinchroniniais varikliais apžvalga ir jų savybių analizė. Tiriamoji dalis apima apibendrinto tiesiaeigio asinchroninio variklio matematinio modelio sudarymą ir mechaninių charakteristikų tyrimą programiniu paketu MathCAD 2001 Professional. Programa skaičiavimo rezultatus pateikia grafiniu pavidalu. Gauti rezultatai yra analizuojami ir apibendrinami. Išnagrinėjus teorinius ir praktinius tiesiaeigio asinchroninio variklio darbo režimų aspektus, pateikiamos išvados ir pasiūlymai. Tyrimo rezultatai gali būti panaudoti elektros pavarų su tiesiaeigiais asinchroniniais varikliais racionaliam ir optimaliam realizavimui greitaeigių elektros pavarų technologinėse sistemose. Darbą sudaro 7 dalys, įvadas, literatūros elektros pavaros su tiesiaeigiu asinchroniniu varikliu klausimais apžvalga, tyrimo tikslas ir uždaviniai, skaičiuojamoji dalis, tyrimo rezultatų apibendrinimas, išvados ir... [toliau žr. visą tekstą]
In master thesis researching high-speed electric drive with Linear Induction Motor (LIM) design peculiarities, internals and indexes of quality. Using program MathCAD 2001 Professional was created mathematical model of Linear Induction Motor. By changing Linear Induction Motor parameters (Reynolds's number, SE thickness, air gap, inductor width, number of coils and etc) getting for the defined model appropriate mechanicals characteristics. In master thesis the view of electric drive with Linear Induction Motor has been reviewed and their features analyzed. In the investigation part involves the creation of Linear Induction Motor mathematical model and investigation of mechanicals characteristics on program pack MathCAD 2001 Professional. The program displays results in graphical form. The results are analyzed and generalized. After analyzing theoretical and practical LIM motor aspects of operations, conclusions and suggestions are formed. The results of research can be used for rational and optimal realization of LIM in various technological systems. Structure: introduction, literature electrical drive with LIM questions review, research purpose and tasks, calculation part, summary of research results, conclusions and suggestions, references.

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Sadauskas, Tomas. "Tiesiaeigio asinchroninio variklio magnetinio lauko imitacija." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2006. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20060623_095632-82775.

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In this thesis is investigated how magnetic field varies at different instants of time in the air gap of linear induction motor and outside of it. The are given results of simulation, which show the change of magnetic flux at different instants of time of linear induction motor in the air gap, outside the inductors, also magnetic flux dependencies on air gap width. Two models of linear induction motor with secondary element and without it are compared.

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26

Inčirauskaitė, Asta. "Universalios sklendės tiesiaeigės pavaros tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110620_141649-95793.

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Šiame baigiamajame darbe apžvelgtos dulkių sprogimų atsiradimo priežastys bei sprogimų plitimų mechanizmas. Aprašyti sprogimų žemės ūkio įmonėse padariniai. Aptartos techninės priemonės, įgalinančias lokalizuoti pirminius silpnus dulkių sprogimus ir taip išvengiant stiprių, griaunamosios jėgos sprogimų. Išanalizuotos ugnį užtveriančių ir technologinių universaliųjų sklendžių tiesiaeiges elektros pavaros. Naudojant programinį modeliavimo paketą Matlab Simulink sudarytas universaliosios sklendės tiesiaeigės pavaros modelis ir gautos dinaminių charakteristikų imitacijos kreives. Naudojant programinį paketą SolidWorks sumodeliuota universalioji sklendė ir gauta smūginės bangos slėgio veikiamo sklendės judamojo elemento deformacija ir judamojo elemento deformacija, kai induktoriaus aktyviojoje zonoje įtaisyti papildomi atraminiai guoliai. Baigiamojo darbo pabaigoje pateiktos išvados ir pasiūlymai.
The final work of master analyses the causes of dust explosions and explosions spread mechanism. A short overview of the explosions effects in the agro - industry is presented. Technical devices enabling the localization of primary weak dust explosions and so avoiding the strong, destructive force explosions are discussed. Fire blocking and universal linear electric drives are analyzed. Using software package Matlab Simulink model of universal linear electric drive is created and dynamic characteristics are gained. Using software package SolidWorks model of universal linear electric drive is created and valves mobile element deformation and deformation of the mobile element, when there are installed additional supporting bearings in the inductor active zone are obtained when mobile element is affected by the pressure of the explosion wave. Concluding part presents inferences and suggestions.

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Mitka, Darius. "Roboto valdymo sistema." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2004. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2004~D_20040621_172148-76217.

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The final work of master studies reviews various industrial robots constructions and parameters, from which they are characterized. Robotics systems and control of flexible production have been discussed in here. Various robots’ drives and their control advantages and disadvantages are analyzed. In the practical part original robot global movement platform is suggested and algorithm of two flexible production bays handling is created. Static characteristics of linear drive used in platform are calculated. Using software package “Matlab Simulink” model of symmetrical linear induction motor (LIM) is created and dynamic characteristics are gained. Concluding part presents inferences and suggestions.

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28

Jenkinas, Piotras. "Tiesiaeigės dažninės pavaros tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2004. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2004~D_20040608_172437-19296.

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The properties of linear induction motor and areas of its application are analyzed; frequency converters and their control methods are discussed in this final work. Methods to realize a pulse width modulation are analyzed, scalar and vector control principles as well as perspectives of perfection of semiconductor commutating elements and control systems are discussed. The principle of operation of control systems applied in frequency converters is analyzed On the base of analysis mathematical and Simulink model of linear induction motor in α-β reference frame is developed, mathematical and Simulink models of frequency controlled linear induction drives are carried out. Two models of linear frequency controlled induction drive: scalar and vector control are investigated, transient characteristics of inverter output voltage, currents of linear motor, developed force and linear speed are analyzed and results of different control principles are compared.

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29

Bednařík, Václav. "Výpočet optimálního skluzového kmitočtu asynchronního motoru pro minimalizaci ztrát." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220924.

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This master’s thesis focuses on the minimisation of losses by calculation of optimum slip frequency of induction motor. The next point of this master‘s thesis is supersaturation. Supersaturation must be solved for the size of losses, because of the effect that is cause of the losses, when current increases with saturation. However current is not increase proportionally with increasing saturation, but increases several times more. This problem is included in the calculation of the slip frequency. Optimum of slip frequency is solve for modified gamma model of induction machine. In the main point of this thesis is outlined the process, how the optimum can be found. With same process were already were found the equations, but they were too extensit. In the end is solved the optimum of slip frequency be minimum of the flux density.

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30

Weng, Jiann-Jyh, and 翁健智. "The motion control of linear induction motor." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/78078614172347839725.

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碩士
國立臺灣科技大學
機械工程系
87
The purpose of this thesis is to realize an entire digital PC-Based linear induction servo motor system. The PWM drive card of induction motor which is based on motor coprocessor chip-ADMC201 is designed and is used to generate pulse width modulation signal and deal with some feedback signal. The controller is a microcomputer which deals with the calculation of control laws and transmits the real-time commands to achieve the purpose of software servo control. We order the parameters tests of linear induction motor which differ from rotary one. We adopt sinusoid and voltage space vector pulse width modulation methods by voltage-fed inverter to drive motor. By the use of V/F control, we make experiments about position and velocity closed-loop on the single-sided linear induction motor to prove the hardware and control schemes are available.

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31

Wei, ChuChi, and 魏趨吉. "The Motion Control of Linear DC Brushless Motor and Induction Motor." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/03793840785698096686.

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碩士
國立臺灣科技大學
機械工程系
89
This thesis uses RTW(real time workshop) in MATLAB Simulink software.The Vector control of DC brushless motor and induction motor is accomplished. MATLAB Simulink contains the advantages of rapidly designing, easily correcting,easily analyzing and friendly human-machine interface. This thesis begins with constructing the mathematical motor models and blocks of RFO Vector Control in MATLAB Simulink.The Clarke and the Park transformation are also used for the Vector Control theorem. After the simulation,this thesis continues to present the Vector Control experiments by RTW.We change the modules of the mathematical motor models into the I/O modules.The voltages are output to the driver and signals form Hall-Sensor and position encoder are feedback to interface card.Finally the real-time control is accomplished.

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32

莊福祿. "Position Control for Single-Sided Linear Induction Motor." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/90920930579080070995.

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碩士
國立中興大學
電機工程學系
91
This thesis develops methodologies for positioning of a single-sided induction motor (SLIM). Although the PID controller have been extensively used in industry. Such a controller would not given good tracking performance, when the transfer functions or the parameters of plants vary with time, or unpredictable disturbances occur. To deal with these shortcomings, we propose a new type of control structure, which combines a simple recurrent neural-networks identifier (SRNNI), and a simple recurrent neural-networks compensator (SRNNC). The SRNNI and SRNNC make use of the dynamic back-propagation (DBP) method for updating their weightings and ensure that the output of the plant is able to follow the desired output generated by a reference model. Computer simulation results have used to verify the effectiveness and feasibility of the proposed control method. Through experimental results, the proposed positioning control for the SLIM has been show to outperform the traditional PID control, and to given an excellent control efforts.

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33

Liu, Wei-Kuo, and 劉偉國. "Nonlinear Control for Linear Induction Motor Drive System." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/74455839173408915402.

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碩士
元智大學
電機工程研究所
89
Abstract The purpose of this thesis is to develop a sliding-mode feedback linearization control (SMFLC) system and an adaptive optimal control(AOC) system for the high-precision position control of a linear induction motor (LIM). First, the driving cricuit of the LIM is developed and the nonlinear decoupled control technique is adopted to decouple the thrust force and the flux amplitude of the LIM. Then, a SMFLC system, which is comprised of a sliding-mode flux and a sliding-mode position controllers, is designed in order to increase the robustness of LIM drive system. Moreover, to relax the requirement of the secondary flux in the SMFLC system, an adaptive flux observer is proposed to estimate the secondary flux. The control laws of the SMFLC system are derived in the sense of Lyapunov stability theorem such that the asymptotically stability of the control system can be guaranteed even under the possible occurrence of uncertainties. In addition, an AOC system is designed to increase the system control performance. In the AOC system, an adaptive uncertainty observer is used to estimate the bound of uncertainties for confronting the shortcoming in the traditional optimal control system. The control laws of the AOC system also are derived in the sense of Lyapunov stability theorem, so that system-tracking stability can be guaranteed. Finally, the effectiveness of the proposed control schemes is verified by both numerical simulation and experimental results.

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34

Chin-Liun, Chen, and 陳俊良. "Simulation and analysis of linear induction motor drives." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/85458052891035667979.

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碩士
國立臺灣科技大學
機械工程系
87
Abstract The purpose of this paper is to simulate the vector control of induction motor by using the software MATLAB-SIMULINK. We first expound the formulation of the electric electron element model, which is needed in rotor magnetic field oriented control, and the two kinds of different pulse modulation rules, in order to modulate the order of entering motor driver signal. Then, we use the equal-effect electric circuit of the induction motor to establish a mathematical formula which is to apply to magnetic field oriented control. It is also explained in the paper how to complete indirect vector control, in order to have a fixed speed and fixed position control over the motor. We also analyze the different flux estimation laws, on the purpose of reaching a sensorless control, and discuss the test results as a reference for further practices. Finally, we analyze the equal-effect electric circuit of the linear induction motor. Because of its construction, we make use of the asymmetric effect of its d-q axis and compare its difference to the open route test of a symmetric model. Then, we apply the linear induction motor model to accomplish a speed close loop vector control and discuss the result.

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35

Chen, Ko-Lo, and 陳可樂. "Nonlinear Adaptive Motion Control of Linear Induction Motor." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/10758791612996439842.

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碩士
國立臺灣大學
電機工程學研究所
89
In this thesis, we will proposed a nonlinear adaptive controller and an adaptive backstepping controller for linear induction motor to achieve speed/position tracking. A nonlinear transformation is proposed to facilitate controller design. The rotor flux observer is designed to relax the need of flux measurement. Besides, the very unique end effect of the linear induction motor is also considered and is well taken care of in our controller design. Stability analysis based on Lyapunov theory is also performed to guarantee that the controller design here is stable. Also, the computer simulations and experiments are done to demonstrate the performance of our various controller design.

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36

Yu, Soon-Huang, and 游順煌. "Design and Implementation of Linear Induction Motor Drives." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/07449654371326034691.

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碩士
國立臺灣科技大學
機械工程研究所
84
Owing to the difference between linear motor and rotary motor, like as end-effect, edge effect, skin effect, larger air gap and harmonic, unbalance phenomenon, and the normal force coupling effect , So the paper make the mathematical model and the equivalent circuit, and analysis the static and dynamic thrust-velocity characterictic, and improve the system performance. Using digital signal processor and the IGBT inverter module, with the technologies of vector control and voltage space PWM , design and implement a one-horsepower motor drives, also test the capability in rotary indiction motor. Taking account of the end-effect compensation in linear induction motor drives control law. And the method has control of effective flux, allowing a complicated induction motor to be treated as an ideal one, then a frequency compensation control follows to reduce error, then examines and improves the thrust- velocity performance. Finally, the paper accomplishes the velocity and position control under different loading conditions.

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37

Jean, Chern Guang, and 簡辰光. "The Fundamental Research of The Linear Induction Motor." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/45939265580634004438.

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碩士
國立臺灣科技大學
機械工程研究所
84
Nowadays, it is respectively important for the requirement of the precision because of the more and more progress of the technology. If we use the rotation induction motor with some transformation mechanisms to achieve the aim of the linear motion,but the precision will be effective and naturally become worse by these auxiliary mechanisms. If we can develop a kind of motor which can do linear motion without any auxiliary mechanisms, it belives certainly to promote the precision. Now, the rotation induction motor is widely used in the industries because of its easy mechanism and durabi-lity. However, the conception of the linear motors are ori-ginal in the rotation motors, but linear motors have some advantages that rotation motors do not have.For example, linear induction motors have low noise 、 high initial th-rust and so on. The aim of thispaper is mainly to discuss the linear induction motors from the method of the design to the control theorem.

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38

Hsu, Shu-Peng, and 徐書鵬. "Linear Induction Motor Drive System Based on Backstepping Controller." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/23579098446808039182.

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碩士
中原大學
電機工程研究所
89
The subject of this thesis is to develop a linear induction motor (LIM) drive control system based on backstepping control. First, the dynamic model of an indirect field-oriented linear induction motor drive is derived. Then, a recurrent-fuzzy-neural-network(RFNN) backstepping control system, a recurrent-neural-network(RNN) backstepping control system and an adaptive backstepping sliding mode control system are developed individually for the robust and precise position control of the linear induction motor. A recurrent-fuzzy-neural-network backstepping control system is proposed to compensate the uncertainties occurred in the motion control system where a RFNN uncertainty observer is proposed to estimate the required lumped uncertainty parameter in the backstepping control system. Moreover, a recurrent-neural-network backstepping control system is proposed to compensate the uncertainties including the friction force occurred in the motion control system where a RNN uncertainty observer is proposed to estimate the required lumped uncertainty parameter in the backstepping control system. Furthermore, an adaptive backstepping sliding mode control system, which combined both the merits of adaptive backstepping control and sliding mode control, is proposed to control the mover position of a linear induction motor drive to compensate the uncertainties including the friction force. In addition, an adaptive law is derived to adapt the value of lumped uncertainty. Theഊeffectiveness of the proposed control schemes is demonstrated by some simulated and experimental results.

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39

Chang, Chih-Kai, and 張智凱. "FPGA-Based Adaptive Backstepping Control for Linear Induction Motor Drive." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/93389512897072685020.

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碩士
國立東華大學
電機工程學系
94
An FPGA-based adaptive backstepping controller, which combines both the merits of adaptive law and backstepping control, is proposed in this thesis to control the mover position of a linear induction motor (LIM) drive to compensate the uncertainties including the friction force. First, the dynamic model of an indirect field-oriented LIM drive is derived. Next, an FPGA-based LIM drive system, which consists of FPGA development board, D/A converters, a ramp comparison current-controlled PWM, and IGBT inverter, is implemented. Then, a proportional-intergral-derivative (PID) computed-torque controller is designed, but the tracking response is not good. Moreover, a backstepping controller and a backstepping sliding-mode controller are presented. The uncertainties are lumped and the upper bound of the lumped uncertainty is necessary in the design of the backstepping controller and the backstepping sliding-mode controller. However, the upper bound of the lumped uncertainty is difficult to obtain in advance in practical applications. Therefore, an adaptive law is derived to adapt the value of the lumped uncertainty in real time, and an adaptive backstepping controller and an adaptive backstepping sliding-mode controller are designed to make the LIM drive possessing the advantages of good transient control performance and robustness. Finally, one can verify that the adaptive backstepping control systems are better than the conventional backstepping control systems from the experimental tracking responses.

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40

Wang, Chien-Chih, and 王建智. "Computer-aided Design of a Three-Phase Linear Induction Motor." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/94799931801116557915.

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碩士
桃園創新技術學院
機械工程系機械與機電工程碩士班
103
This paper presents the structure of the application of T type Semi-open parallel slots embedded-type ladder conductor to enhance the thrust of the linear induction motor (LIM).In the analysis, 12 cases combinations are achieved through calculating the type size of the motor, constructing geometric forms with graphic application, performing finite element method software to analyze 4 mobile substructure, and combining with 3 fixed sub-type. Compare the thrust and ripple force of these 12 combinations cases, ladder conductor with back iron increases the thrust, and decreases the effective air-gap, and it reveals the amplification of the thrust, as the simulation result. T type Semi-open parallel slots embedded-type ladder conductor possesses favorable thrust; this simulation data can be used as reference basis when estimating practical linear motor performances.

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41

Peng, Shao-Wei, and 彭紹瑋. "Design and thrust analysis of three-phase linear induction motor." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/82934562404909131744.

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碩士
桃園創新技術學院
機械工程系機械與機電工程碩士班
104
This paper presents the thrust analysis on the structure of the application of semi-open parallel slots moving core ladder shape conductor, as well as the thrust relationship of the conductor with different thickness, based on both distributed and centralized windings. The study applies the data from the finite element analysis on distributed and centralized windings between magnetic flux density and the conductor, the thickness of ladder shape conductor of linear motor as the experimental factor of winding moving core, and finite element analysis to find out thrust behavior analysis of the linear motor. The simulative result of analysis shows that the structure of the application of semi-open parallel slots moving core ladder shape aluminum conductor can effectively improve linear motor thrust, and prove distributed winding, better than centralized one, can promote the thrust significantly. It can also be used as reference basis to develop linear motor.

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42

Hung, Cheng-Yao, and 洪振堯. "Linear Induction Motor Control Based on Adaptive and Fuzzy Approaches." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/00452374330993812566.

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博士
中原大學
電機工程研究所
96
This dissertation presents a speed control issue for linear induction motors (LIMs) under features of adaptive control and T-S fuzzy model based control. A gradual progress is done to achieve robust sensor-based speed control and sensorless speed control. First of all, the end-effect is taken into our consideration for linear induction motor (LIM) modeling in contrast to former researches. After the LIM model is derived, optimal force property is mentioned by a constant secondary flux and is further applied in the controller design process. Then the speed/position tracking control is achieved under a practical current-fed condition with residual current errors which is more relaxed than traditional ideal current-fed control. The novel robust adaptive control scheme called adaptive VDV (virtual desired variable) synthesis is carried out to deal with the existence of parametric uncertainty including unknown end-effect and secondary resistance. More practical conditions including boundary primary voltage and finite absolute-integral of current tracking is considered; however, the proposed controller still achieves asymptotic speed and position tracking. Furthermore, the effect of residual current errors is attenuated in an L₂-gain sense. In addition, we probe into the issue of sensorless speed control to avoid using expensive sensors. To this end, the nonlinear LIM is represented in T-S fuzzy form. Next, an observer is constructed to estimate the immeasurable states of mover speed and secondary flux, where the observer gains are obtained by solving a set of linear matrix inequalities (LMIs). Combination of the fuzzy observer and VDV-synthesis concept leads to exponential speed tracking. Finally, the T-S fuzzy model-based VDV controller is proposed by applying the T-S fuzzy observer and controller design. In detail, the design procedure is in two independent steps: 1) determine the virtual desired variables from desired output equations; 2) determine the control feedback gains and observer gains by independently solving a set of LMIs. The benefits of the fuzzy model-based VDV design is resulting a strict overall stability analysis and easy gain design. The simulations and experiments results show the satisfactory performance in both adaptive control and T-S fuzzy sensorless control.

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43

Chen, Cheng-Yen, and 陳政言. "FPGA-Based Robust RBFN Control for Linear Induction Motor Drive." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/8xynvn.

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碩士
國立東華大學
電機工程學系
95
The purpose of the thesis is to develop a field programmable gate array (FPGA)-based robust radial basis function network (RBFN) control for linear induction motor drive. An adaptive backstepping control system with RBFN observer is also adopted to confront the uncertainties including the friction force in this thesis. First, the dynamic model of an indirect field-oriented LIM drive is derived. Next, an FPGA-based LIM drive system, which consists of FPGA development board, D/A converters, a ramp comparison current-controlled PWM, and IGBT inverter, is implemented. Then, a robust RBFN controller is designed. However, the lumped uncertainty is difficult to obtain in advance in practical applications. Therefore, an adaptive backstepping control system with RBFN observer is derived to adapt the value of the lumped uncertainty in real time, and it is designed to make the LIM drive possessing the advantages of good transient control performance and robustness. Finally, the effectiveness can be verified using the simulated and the experimental results.

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44

Lai, Chien-Liang, and 賴建良. "Driver Design and Implementation of a Single-Sided Linear Induction Motor." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/67582903073445374770.

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碩士
國立中興大學
電機工程學系
86
This thesis develops methodologies for mathematical modeling, velocity tracking,positioning and implementation of a single-sided linear induction motor (SLIM). Alinearized transient-state mathematiacl model is derived using the phasor method andthe electromagnetic dynamics. Three independent, constant-frequency PWM current control loops are developed. Several experiment are descrided which were performedto verify the linearized model, thus obtaining a nominal transfer function for theSLIM. Three control approaches, such as conventional PID control, optimal PID controland H-Infinity control, are used to track the reference velocity command during startupas rapidly as possible while avoiding large overshoots and rejecting the effects of load variation. After developing high-performance current and velocity control loops,two types of position controllers are designed to complete the positioning task withoutexceeding the maximum velocity of the SLIM. The experimental setup is composed of aprecisely laser displacement measurement unit, a ramp comparison PWM current inverter, a host computer PC-486 and a digital signal processor (DSP) TMS320C31 with 16-bitanalog-to-digital converters and digital input/output circuits. Computer simulationsare described which were performed to illustrate effectiveness and feasibility of theproposed control laws. Experimental results show that the proposed linearized modelis valid and the proposed methods are capable of giving excellent results on the SLIM.

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45

Lee, Chin-Chung, and 李清忠. "Linear Induction Motor Drive System Based on Intelligent and Nonlinear Control." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/75861950369371486158.

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碩士
中原大學
電機工程學系
88
The purpose of this thesis is to develop a linear induction motor (LIM) drive system based on intelligent and nonlinear control. First, the driving circuit of the linear induction motor is developed. Then, the nonlinear decoupled control technique is adopted for the decoupling control of the linear induction motor. The second-side sliding-mode flux observer and the feedback linearization theory are used to decouple the thrust force and the flux amplitude of the linear induction motor. Moreover, since the linear induction motor is a nonlinear and time-varying system, a robust controller and an adaptive backstepping controller are developed for the precise position control of the linear induction motor. The robust controller, which combines an IP position controller and a neural network uncertainty observer, is proposed to increase the robustness of linear induction motor drive system. In the robust controller, the motor drive system at the nominal condition is selected as the reference model, and the mover position and speed errors between the reference model and linear induction motor servo drive system are used to estimate the lumped uncertainty based on the neural network uncertainty observer. However, the robust controller with IP position controller can track periodic step-command only. Therefore, a feedforward control is added to the IP control system for the tracking of periodic sinusoidal and triangular reference inputs. Though theoretically the feedforward control can track any time varying reference, the robust control performance is degenerate when the uncertainties occur in the controlled plant. Thus, an adaptive backstepping approach is proposed to obtain the robustness for uncertainties. With the proposed adaptive backstepping controller, the mover position of the linear induction motor drive possessed the advantages of good transient control performance and robustness to uncertainties for the tracking of periodic reference inputs. The effectiveness of the proposed control schemes is verified by both the simulated and experimental results.

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46

chang, hung-ming, and 張鴻銘. "Adaptive Motion Control with End-Effect Compensation for Linear Induction Motor." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/58789665848372732622.

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碩士
國立臺灣大學
電機工程學研究所
90
In this thesis, we will propose a new mathematic model for end-effect compensation and a nonlinear adaptive controller for linear induction motor to achieve speed/position tracking. A nonlinear transformation is proposed to facilitate controller design. The flux observer and the secondary-side resistance are designed to relax the need of flux measurement and the resistance drift, respectively. Besides, the unknown force is designed as the function of velocity. Stability analysis based on Lyapunov theory is also conducted to ensure that the controller design here is stable. Also, the computer simulations and experiments demonstrate the performance of our various tracking scenarios.

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47

Wang, Dong-Hai, and 王東海. "FPGA-Based Fuzzy Sliding-Mode Control for Linear Induction Motor Drive." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/70118303630086190737.

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碩士
國立東華大學
電機工程學系
93
An FPGA-based fuzzy sliding-mode controller, which combines both the merits of fuzzy control and sliding-mode control, is proposed in this thesis to control the mover position of a linear induction motor (LIM) drive to compensate the uncertainties including the friction force. First, the dynamic model of an indirect field-oriented LIM drive is derived. Then, FPGA-based LIM drive system, which consists of FPGA development board, three D/A converters, a ramp comparison current-controlled PWM, and a dead-time compensation circuit is implemented. Next, an integral-proportional controller and a fuzzy controller are designed. Moreover, a sliding-mode controller with an integral-operation switching surface is designed. The uncertainties are lumped in the sliding-mode controller and the upper bound of the lumped uncertainty is necessary in the design of the sliding-mode controller. However, the upper bound of the lumped uncertainty is difficult to obtain in advance in practical applications. Therefore, a fuzzy sliding-mode controller is investigated, in which a simple fuzzy inference mechanism is utilized to estimate the upper bound of lumped uncertainty. With the fuzzy sliding-mode controller, the mover of the LIM drive possesses the advantages of good transient control performance and robustness to uncertainties for the tracking of periodic reference trajectories. An FPGA chip is adopted to implement the indirect field-oriented mechanism and the developed control algorithms. Finally, the effectiveness of the proposed control schemes is verified by some experimental results.

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48

Huang, Guan-Hua, and 黃冠華. "Performance-effective Enhanced Fuzzy Sliding Mode Control for Linear Induction Motor Drives." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/91550909882485402968.

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碩士
輔仁大學
電機工程學系碩士班
101
In this thesis, an enhanced fuzzy sliding mode control system (EFSMC) with a flux observer is proposed for a linear induction motor (LIM) to achieve the position tracking. First, the dynamic model of LIM is introduced, and the end effect and the friction force are also considered in the observer-based compensation design to cope with the time-varying uncertainties. Then, a sliding mode control (SMC) based on the backstepping control technique is presented. This controller is combined with two fuzzy logic controllers to improve the tracking performance of the LIM. The first fuzzy logic controller is proposed, through a dynamic tune of the sliding surface slope constant of the SMC according to the controlled system states by a fuzzy logic unit. To relax the need of the upper bound of the lumped uncertainties in the SMC, the second fuzzy logic controller is presented, in which the upper bound of the lumped uncertainties can be estimated by a fuzzy inference mechanism. With the proposed EFSMC, the mover of the LIM achieves the good performance and robustness in the tracking of periodic reference trajectories, even with unknown system parameters and/or uncertainties. Also, the computer simulations and experiments for several scenarios are conducted to demonstrate the effectiveness of the proposed controller design.

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49

Huang, Chih-Chung, and 黃執忠. "The improvement of cutting path error for linear induction motor feeding system." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/31027622401262530066.

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碩士
國立清華大學
動力機械工程學系
93
In past few years, using of linear motor becomes a good approach for high speed feeding and cutting for the machine tools. In all types of linear motor, linear induction motor is the most potential one to be used in this purpose. However, use of the linear induction motor in machine tools causes cutting path error due to the long reaction time to balance the cutting force. To study the cutting path error, in this thesis the model of three axes machine tool by using MSC.ADAMS, the equivalent models of linear induction motor and cutting force in Simulink environment are set up. Combining those three models, the cutting path of linear machine tool is simulated. From the results of the simulation, the cutting path error is found and the methods to decrease cutting path error are suggested.

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50

Huang, Po-Kai, and 黃柏凱. "Recurrent Fuzzy Neural Network Controlled Linear Induction Motor Drive Based on Genetic Algorithm." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/01832501290796089644.

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碩士
中原大學
電機工程研究所
91
The subject of this thesis is to develop a recurrent fuzzy neural network (RFNN) controlled linear induction motor (LIM) drive based on genetic algorithm (GA). First, the dynamic model of an indirect field-oriented linear induction motor drive is derived. The personal computer (PC) controlled LIM drive system consists of PC, AD/DA servo control card, and a ramp comparison current-controlled PWM. Then, the on-line tuning of the RFNN learning rates and weights using real-coded GA are developed individually to achieve the robust and precise position control of the LIM. Using real-coded GA to search the optimal learning rates of the RFNN can reduce time consumption in the trial-and-error process and guarantee an optimal solution. In addition, using the real-coded GA to search the optimal weights of the RFNN can avoid the network from converging slowly or diverging due to bad network architecture. Finally, the effectiveness of the proposed control schemes is demonstrated by simulated and experimental results.

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