Dissertations / Theses: 'Induction Motors - Vector Control'

1

Zhang, Zaining. "Sensorless vector control for induction motors." Thesis, University of Sussex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340849.

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2

Bharadwaj, Aravind S. "Vector controlled induction motor drive systems." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-172143/.

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3

Ozcelik, Eray. "Speed Sensorless Vector Control Of Induction Machine." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606063/index.pdf.

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Focus of this work is closed-loop speed control of an induction machine based on direct field-oriented control (DFOC) algorithm, using estimates of speed and flux observers which utilize only stator current and voltage. Theoretical bases of the algorithms are explained in detail and their performances are investigated with simulations and experiments. Field Orientated Control is based on projections which transform a threephase time and speed dependent system into a two co-ordinate time invariant system. These projections lead to a structure similar to that of a DC machine control. Transformations are done in synchronous frame alligned to d-axis of rotor flux. So rotor flux position must be known accurately to make these transformations. Degined flux observer, in which voltage model is assisted by current model via a closed-loop to compensate voltage model&rsquo
s disadvantages, estimates the position of the rotor flux. Obtaining adequate torque control via FOC, speed loop is closed using conventional PI regulators. Speed feedback is necessary to complete control loop. Model Reference Adaptive System is studied as a speed estimator. Reactive power scheme is applied to MRAS algorithm to estimate rotor speed. In this study, the direct (rotor) flux oriented control system with flux and speed estimators is described and tested in real-time with the starter kit named TMS320F2812 eZdsp DSK and the Embedded Target for the TI C2000 DSP tool of Matlab

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4

Purcell, Anthony. "New switching techniques for direct torque controlled induction motor drives." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285275.

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5

Healey, Russell Cameron. "Advanced induction motor models for vector controllers." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337900.

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6

Kanekal, Ramesh V. "Modeling, simulation and analysis of an indirect vector controlled induction motor drive." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/76443.

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Vector control technique is being widely used in ac motors drives for precise dynamic control of torque, speed and position. The application of vector control scheme to the induction motor drive and the complete modeling, analysis and simulation of the drive system are presented in this thesis. State space models of the motor and the speed controller and the real time models of the inverter switches and the vector controller are integrated to model the drive. Performance differences due to the use of PWM and hysteresis current controllers are examined. Simulation results of the torque and speed drive systems are given. The drive system is linearised around an operating point and the small signal response is evaluated.
Master of Science

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7

Blasco, Giménez Ramón. "High performance sensorless vector control of induction motor drives." Thesis, University of Nottingham, 1995. http://eprints.nottingham.ac.uk/13038/.

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The aim of this research project was to develop a vector controlled induction motor drive operating without a speed or position sensor but having a dynamic performance comparable to a sensored vector drive. The methodology was to detect the motor speed from the machine rotor slot harmonics using digital signal processing and to use this signal to tune a speed estimator and thus reduce or eliminate the estimator’s sensitivity to parameter variations. Derivation of a speed signal from the rotor slot harmonics using a Discrete Fourier Transform-based algorithm has yielded highly accurate and robust speed signals above machine frequencies of about 2 Hz and independent of machine loads. The detection, which has been carried out using an Intel i860 processor in parallel with the main vector controller, has been found to give predictable and consistent results duing speed transient conditions. The speed signal obtained from the rotor slot harmonics has been used to tune a Model Reference Adaptive speed and flux observer, with the resulting sensorless drive operating to steady state speed accuracies down to 0.02 rpm above 2 Hz (i.e. 60 rpm for the 4 pole machine). A significant aspect of the research has been the mathematical derivation of the speed bandwidth limitations for both sensored and sensorless drives, thus allowing for quantitative comparison of their dynamic performance. It has been found that the speed bandwidth limitation for sensorless drives depends on the accuracy to which the machine parameters are known and that for maximum dynamic performance it is necessary to tune the flux and speed estimator against variations in stator resistance in addition to the tuning mechanism deriving from the DFT speed detector. New dynamic stator resistance tuning algorithms have been implemented. The resulting sensorless drive has been found to have a speed bandwidth equivalent to sensored drives fitted with medium resolution encoders (i.e. about 500 ppr), and a zero speed accuracy of ± 8 rpm under speed control. These specifications are superior to any reported in the research literature.

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8

Acar, Akin. "Implementation Of A Vector Controlled Induction Motor Drive." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1219286/index.pdf.

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High dynamic performance, which is obtained from dc motors, became achievable from induction motors with the recent advances in power semiconductors, digital signal processors and development in control techniques. By using field oriented control, torque and flux of the induction motors can be controlled independently as in dc motors. The control performance of field oriented induction motor drive greatly depends on the correct stator flux estimation. In this thesis voltage model is used for the flux estimation. Stator winding resistance is used in the voltage model. Also leakage inductance, mutual inductance and referred rotor resistance values are used in vector control calculations. Motor control algorithms use motor models, which depend on motor parameters, so motor parameters should be measured accurately. Induction motor parameters may be measured by conventional no load and locked rotor test. However, an intelligent induction motor drive should be capable of identifying motor parameters itself. In this study parameter estimation algorithms are implemented and motor parameters are calculated. Then these parameters are used and rotor flux oriented vector control is implemented. Test results are presented.

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9

Karanayil, Baburaj Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "Parameter identification for vector contolled induction motor drives using artificial neural networks and fuzzy principles." Awarded by:University of New South Wales. Electrical Engineering and Telecommunications, 2005. http://handle.unsw.edu.au/1959.4/21999.

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This thesis analyses, develops and implements a very fast on-line parameter identification algorithm for both rotor and stator resistances of a rotor flux oriented induction motor drive, with the best possible convergence results using artificial neural networks and fuzzy logic systems. The thesis focuses mainly on identifying the rotor resistance, which is the most critical parameter for RFOC. Limitations of PI and fuzzy logic based estimators were identified. Artificial neural network based estimators were found to track the rotor and stator resistances of the drive accurately and fast. The rotor flux of the induction motor estimated with a classical voltage model was the key input of the rotor resistance estimator. Because, pure digital integrators were unable to play this role, an alternative rotor flux synthesizer using a programmable cascaded filter was developed. This rotor flux synthesizer has been used for all of the resistance estimators. It was found that the error in rotor resistance estimation using an ANN was contributed to by error in the stator resistance (caused by motor heating). Several stator resistance estimators using the stator current measurements were developed. The limitations of a PI and a fuzzy estimator for stator resistance estimation were also established. A new stator resistance identifier using an ANN was found to be much superior to the PI and fuzzy estimators, both in terms of dynamic estimation times and convergence problems. The rotor resistance estimator developed for this thesis used a feedforward neural network and the stator resistance estimator used a recurrent neural network. Both networks exhibited excellent learning capabilities; the stator resistance estimator network was very fast as it had a feedback input. A speed estimator was also developed with the state estimation principles, with the updated motor parameters supplied by the ANN estimators. Analysis for speed sensorless operation has shown that the stator and rotor resistances could be updated on-line.

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10

Slater, Howard James. "Real time emulation environment for digital control development." Thesis, University of Newcastle Upon Tyne, 1997. http://hdl.handle.net/10443/925.

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Simulation is a powerful tool for developing electric drive systems. Simulations allow the designer to experiment with control algorithms and hardware systems in a safe environment. To this end simulation is becoming increasingly popular. On'-line simulation does have its limitations in that the controller developed during the simulation period has eventually to be transferred to the target processor which will operate in the actual drive system. If, however, a real-time simulation environment could be realised, then the actual controller running in the actual target processor could be included in the simulation. Therefore no translation of code would be required once the controller had been developed and tested within the simulation. This would obviously lead to a reduction in development time and eliminate any possibility of introducing errors due to the translation between the simulated and actual controllers. This thesis describes the development of such a system using a multiple digital signal processing environment. The real-time simulated drive is operated in parallel with an experimental drive to allow a direct comparison between the two. The ability of the multiple processing system to operate in real-time has allowed the whole concept of simulation to be taken a stage further by the development of a real-time power level simulator. This simulator is capable of emulating a machine and load in real-time with real level of voltage and current. It is designed to replace a real machine during the development and testing stages of drive manufacture. This Virtual Machine is a controllable source/sink which is driven by the real-time simulation, and because of this the Virtual Machine takes on the characteristics of any choice of model within the real-time simulation. Moreover, because of its ability to handle bi-directional power flow, the Virtual machine can be programmed to emulate motors or generators. The Virtual Machine also includes the emulation of loads, thus making it extremely flexible and of interest to applications such as machine tools, electric vehicles, and wind generators, to name but a few.

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11

Pye, Gregory. "Precision position control of a three-phase squirrel-cage induction motor using vector control." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357862.

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12

Ertugrul, Baris Tugrul. "Sensorless Vector Control Of Induction Motor Based On Flux And Speed Estimation." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12610297/index.pdf.

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The main focus of the study is the implementation of techniques regarding flux estimation and rotor speed estimation by the use of sensorless closed-loop observers. Within this framework, the information about the mathematical representation of the induction motor, pulse width modulation technique and flux oriented vector control techniques together with speed adaptive flux estimation &ndash
a kind of sensorless closed loop estimation technique- and Kalman filters is given. With the comparison of sensorless closed-loop speed estimation techniques, it has been attempted to identify their superiority and inferiority to each other by the use of simulation models and real-time experiments. In the experiments, the performance of the techniques developed and used in the thesis has been examined under extensively changing speed and load conditions. The real-time experiments have been carried out by the use of TI TMS320F2812 digital signal processor, XILINX XCS2S150E Field Programmable Gate Array (FPGA), control card and the motor drive card Furthermore, Matlab &ldquo
Embedded Target for the TI C2000 DSP&rdquo
and &ldquo
Code Composer Studio&rdquo
software tools have been used. The simulations and experiments conducted in the study have illustrated that it is possible to increase the performance at low speeds at the expense of increased computational burden on the processor. However, in order to control the motor at zero speed, high frequency signal implementation should be used as well as a different electronic hardware.

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13

Novinschi, Anca. "Simulation and implementation of rotor flux control for an induction motor." Thesis, De Montfort University, 1998. http://hdl.handle.net/2086/5208.

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14

Sguarezi, Filho Alfeu Joãozinho. "Controle de potências ativa e reativa de geradores de indução trifásicos de rotor bobinado para aplicação em geração eólica com a utilização de controladores baseados no modelo matemático dinâmico do gerador." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260744.

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Orientador: Ernesto Ruppert Filho
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: A energia eólica surge como alternativa à crescente demanda por energia elétrica e as preocupações com as reduções de emissão de materiais poluentes no mundo todo. Nesse contexto, o objetivo desta tese é o de propor o uso de três tipos de controladores de potências ativa e reativa do gerador de indução trifásico com rotor bobinado para uso em parques eólicos. Os controladores propostos são o controlador deadbeat, o controlador por desacoplamento de fluxo de enrolamento de estator associado com o controlador deadbeat e, finalmente, o controlador preditivo, todos eles baseados na modelagem dinâmica do gerador. O gerador tem tanto seu enrolamento de estator diretamente conectado à rede elétrica e seu enrolamento de rotor conectado à rede através de um conversor bidirecional que permite ao fluxo de potência apresentar um comportamento bidirecional. Avalia-se também o desempenho dos controladores de potências mencionados quando existem erros nos parâmetros estimados do gerador. Resultados de simulação computacional do modelo matemático dinâmico do sistema bem como resultados experimentais obtidos em uma montagem de bancada são apresentados para comprovação das propostas.
Abstract: Wind energy is an alternative to the growing demand for electricity and concerns about emission reductions of pollutants worldwide. In this context, the objective of this thesis is to propose the use of three types of real and reactive power controllers of the wound rotor three phase induction generator to be used in wind farms. The proposed controllers are the deadbeat controller, the controller by decoupling stator winding magnetic flux associated with the deadbeat controller and finally, the predictive control, all based on the generator dynamic mathematical model. The generator has its stator windings directly connected to the grid as its rotor windings connected to the network through a bi-directional converter that allows the power flow in the two directions. It also evaluates the performance of the mentioned power controllers when there are errors in the estimated generator's parameters. Results of computer simulations of the system dynamic mathematical model and experimental results obtained on a laboratory assembly are presented to check the proposals.
Doutorado
Energia Eletrica
Doutor em Engenharia Elétrica

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15

Diniz, Ãber de Castro. "Use of three-phase induction motors in an articulated manipulator of 2-dof considering the strategies of vector control and slidnig mode control." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=10710.

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This paper proposes the position control of an articulated manipulator of two degrees of freedom driven by induction motors with a controller in the current loop. The work includes the mechanical modeling of the handler that will be developed from the direct and inverse kinematics and position control of induction motors operating system and uncoupled allocated in the manipulator. Thus, we developed two strategies for control of manipulators with two degrees of freedom, one using the scheme for field-oriented vector control and other means of indirect sliding mode control (Sliding-Mode Control - SMC). These control strategies are applied to current loop of induction motors that drive the manipulator. The parameters of the position controller of manipulator are taken into account in calculating the controller parameters of the current control loop, in order to obtain satisfactory results in the positioning the degrees of freedom. In addition, we performed a comparative study between the indirect field-oriented vector control and sliding mode control applied to the current loop. The advantage of the SMC compared to the indirect field-oriented vector control due to the first had in its control law, developed in this thesis, the use of position degree of freedom manipulator applied directly in the control law, while the second acted only as a disturbed rejection controller for the position loop. The Proportional-Integral (PI) was used in the position and speed loops for both current control algorithms to provide a standard for comparison between. For the purpose of implementing the control system individually for each engine and motors coupled to the manipulator used a digital signal processor.
O presente trabalho propÃe o controle de posiÃÃo de um manipulador articulado de dois graus de liberdade acionado a partir de motores de induÃÃo trifÃsicos com um controlador na malha de corrente. O trabalho contempla a modelagem mecÃnica do manipulador que serÃ desenvolvida a partir das cinemÃticas direta e inversa e o controle de posiÃÃo dos motores de induÃÃo atuando desacoplados do sistema e alocados no manipulador. Deste modo, foram desenvolvidas duas estratÃgias de controle de manipuladores com dois graus de liberdade, uma utilizando o esquema por controle vetorial de campo orientado indireto e outra atravÃs de controle por modos deslizantes (Sliding Mode Control â SMC). Estas estratÃgias de controle sÃo aplicadas a malha de corrente dos motores de induÃÃo que acionam o manipulador. Os parÃmetros do controlador de posiÃÃo dos manipuladores sÃo levados em consideraÃÃo no cÃlculo dos parÃmetros do controlador da malha de controle de corrente, de modo a se obter resultados satisfatÃrios no posicionamento dos graus de liberdade. AlÃm disso, foi realizado um estudo comparativo entre o controle vetorial de campo orientado indireto e o controle de modos deslizantes aplicado na malha de corrente. A vantagem do SMC em relaÃÃo ao controle vetorial de campo orientado indireto deveu-se a que o primeiro possuÃa em sua lei de controle desenvolvida nesta tese a utilizaÃÃo direta da posiÃÃo do grau de liberdade do manipulador, enquanto que o segundo atuava somente como um controlador com rejeiÃÃo ao distÃrbio. O controlador Proporcional-Integral (PI) foi utilizado nas malhas de posiÃÃo e velocidade de modo a fornecer um padrÃo de comparaÃÃo confiÃvel entre os controladores de corrente. Com a finalidade de implementar o sistema de controle de cada motor individualmente e dos motores acoplados ao manipulador utilizou-se um processador digital de sinais.

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16

Ertek, Talip Murat. "Speed Estimation Techniques For Sensorless Vector Controlled Induction Motor Drive." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606863/index.pdf.

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This work focuses on speed estimation techniques for sensorless closed-loop speed control of an induction machine based on direct field-oriented control technique. Details of theories behind the algorithms are stated and their performances are verified by the help of simulations and experiments. The field-oriented control as the vector control technique is mainly implemented in two ways: indirect field oriented control and direct field oriented control. The field to be oriented may be rotor, stator, or airgap flux-linkage. In the indirect field-oriented control no flux estimation exists. The angular slip velocity estimation based on the measured or estimated rotor speed is required, to compute the synchronous speed of the motor. In the direct field oriented control the synchronous speed is computed with the aid of a flux estimator. Field Oriented Control is based on projections which transform a three phase time and speed dependent system into a two co-ordinate time invariant system. These projections lead to a structure similar to that of a DC machine control. The flux observer used has an adaptive structure which makes use of both the voltage model and the current model of the machine. The rotor speed is estimated via Kalman filter technique which has a recursive state estimation feature. The flux angle estimated by flux observer is processed taking the angular slip velocity into account for speed estimation. For closed-loop speed control of system, torque, flux and speed producing control loops are tuned by the help of PI regulators. The performance of the closed-loop speed control is investigated by simulations and experiments. TMS320F2812 DSP controller card and the Embedded Target for the TI C2000 DSP tool of Matlab are utilized for the real-time experiments.

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17

Aounis, Abdulmagid. "An investigation into induction motor vector control based on reusable VHDL digital architectures and FPGA rapid prototyping." Thesis, De Montfort University, 2002. http://hdl.handle.net/2086/5206.

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18

Azcue, Puma José Luis 1981. "Estratégias de controle direto de torque para motores de indução trifásicos usando controladores fuzzy tipo Takagi-Sugeno e controladores por modos deslizantes." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260745.

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Orientador: Ernesto Ruppert Filho, Alfeu Joãozinho Sguarezi Filho
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: Na presente tese de doutorado propõe estratégias de controle por orientação direta de campo (FOC direto) e de controle direto de torque (CDT) com emprego de controladores fuzzy do tipo Takagi-Sugeno (fuzzy T-S). Propõe-se também, uma estratégia de CDT baseado no controle do ¿angulo de carga com o emprego do controle por modos deslizantes (CDT-CMD). As estratégias de controle vetorial propostas são utilizadas para o controle de alto desempenho do motor de indução trifásico. O controlador fuzzy T-S proposto utiliza uma única base de regras para gerar as componentes de eixo direto e de quadratura do vetor espacial da tensão do estator. Isto simplifica a estrutura do controlador fuzzy T-S e em consequência diminui o custo computacional e seu tempo de processamento. Na estratégia de CDT com o controle por modos deslizantes o esforço de controle é sempre o máximo possível no sentido de reduzir os erros do torque e do fluxo. Assim, é possível obter uma resposta rápida no controle do fluxo e do torque. Os resultados de simulação e experimentais são apresentados para validarem as propostas desta tese de doutorado. Os controladores apresentaram um desempenho dinâmico satisfatório pois as referências de torque e de fluxo foram atendidas. Todos os resultados obtidos mostraram-se compatíveis com os resultados apresentados na literatura, validando as estratégias de CDT e de FOC direto propostas
Abstract: This thesis proposes a direct field oriented control (D-FOC) and direct torque control (DTC) strategies with Takagi-Sugeno fuzzy controllers (T-S fuzzy). Also it proposes a DTC strategy based on load angle control with the use of sliding mode control (DTC-SMC). The proposed vector control strategies are used for high performance control of three-phase induction motor. The proposed T-S fuzzy controller uses a single rule base to generate the direct-axis and quadrature-axis components of the stator voltage space vector. This simplifies the structure of the T-S fuzzy controller and consequently it reduces the computational cost and its processing time. However, in the sliding mode control the control effort is always the maximum possible in order to reduce the errors of the torque and the flux. Hence, it is possible to get a fast response in the control of the torque and the flux. The proposed controllers showed a good dynamic performance because the references were achieved. The experimental and simulation results of the vector control strategies were presented to validate the proposed controllers. All the obtained results were consistent with the results reported in the literature, validating the proposed DTC and D-FOC strategies
Doutorado
Energia Eletrica
Doutor em Engenharia Elétrica

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19

Bawana, Niyem Mawenbe. "Thermal Response in a Field Oriented Controlled Three-phase Induction Motor." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7740.

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The research conducted at the department of Electrical Engineering of the University of South Florida campus in Tampa only covers the electrical aspect of electric drives. However, the performance of electric machinery is significantly impacted by temperature variation. The literature review shows three main control techniques in use today in electric drives namely, Scalar control, Direct Torque control and Field Oriented control. This thesis presents a temperature rise of rotor bars, stator winding, stator core and stator frame in a running three phase field-oriented controlled induction machine. A literature search shows that none of research has been carried out to investigate a thermal response of a field-oriented controlled induction motor. With this motivation, we were able to implement a lumped parameters thermal model of a three-phase field-oriented IM in MATLAB Simulink, which allows us to determine that rotor bars have the highest temperatures rising to 84 degrees Celsius. This confirms that rotors bars are the hottest part of a running IM as stipulated in literature.

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Rashed, Mohamed El-Sayed. "Design and implementation of sensorless vector and direct torque control induction motor drives for low speed operation." Thesis, University of Aberdeen, 2002. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602300.

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The invention of the Rotor Field Oriented Control (RFOC) has made the induction machine (IM) dominate the high performance drives market. Fifteen years later, the Direct Torque Control (DTC) strategy has been introduced to give fast torque and flux control with reduced software and hardware requirements. However, the use of flux, speed, current and three-phase stator voltage sensors to monitor the drive states increase the drive cost and reduce the overall system reliability. The number of sensors can be minimised using estimation. However, estimation at low stator frequency operation suffers from pure integration, stability problems, observablity problems, parameter detuning and inverter non-linearity. Thus, it has been suggested to develop and implement stable sensorless RFOC and DTC drives with stator and rotor resistance estimators that can work at low stator frequency with minimal number of sensors. Thus, two types of model reference adaptive system (MRAS) estimators that do not include pure integration have been adopted. A novel design procedure based on linear control theory has been stated to design stable speed, stator resistance and rotor resistance estimators in various operating modes for individual and simultaneous use. The observablity problem at zero stator frequency operation has been eliminated using high frequency injection. The inverter non-linearity has been modeled and thus the model has been used to compensate the inverter voltage losses. The designed estimators have been employed to realise and implement stable sensorless RFOC and DTC IM drives that work at low stator frequency. Furthermore, the classic DTC with fixed switching frequency suffers from torque ripples, flux ripples, torque control offset and flux collapse at low speed and light load. A novel torque ripple minimisation (TRM) DTC scheme has been proposed to predictively eliminate the torque ripple and reduce the flux ripple and also eliminate the torque offset and the flux collapse. In addition, a novel Space Vector Modulation (SVM) DTC has been proposed as an alternative to the TRM DTC scheme and has shown better performance and less computational time. To achieve successful development of sensorless RFOC and DTC drives which can work at low speeds, well-designed stable estimators are the key factor. This research work has given important contribution towards clear vision to analyse and design stable parameter estimators for RFOC and DTC IM drive. It follows, stable speed and stator and rotor resistance MRAS based on back-EMF estimators have been designed for individual and simultaneous use, following the proposed design procedure. These estimators have been employed to implement a stable sensorless RFOC IM drive for low speed operation that insensitive to parameters variation. The performance of the drive has been investigated extensively using simulations and experimental work. In addition, stable speed and stator and rotor resistance MRAS based on current estimation estimators have been designed for individual and simultaneous use. These estimators have been also used to realise a stable sensorless RFOC IM drive for low speed operation. Simulations and experimental work have been carried out to also investigate the performance of the drive. These stable estimators have been also employed to develop two stable sensorless SVM and TRM DTC IM drives for low speed operation and insensitive to stator resistance. The performance of the drives has been investigated for low speed operation using simulations and experimental work. They have shown excellent performance.

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21

Gulec, Mustafa Alpertunga. "Vector Controlled Elevator Drive." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12607186/index.pdf.

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In this thesis, a practical vector controlled elevator drive is presented. Indirect vector control of induction machine is investigated in theory and then implemented. Control technique is compared with scalar control and induction machine is compared with dc motor. The operation of the system depends on induction machine parameters, so how to accurately and automatically obtaining of the parameters is also presented. Finally, the elevator system is introduced, the application of this control system to the elevator system is described and a basic elevator control system is simulated.

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22

Azcue, Puma José Luis 1981. "Controle direto de torque do motor de indução trifásico usando controlador Fuzzy tipo PI autoajustável." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258996.

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Orientador: Ernesto Ruppert Filho
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: Neste trabalho apresenta-se o desempenho de um controlador fuzzy tipo PI autoajustável (FPIA) para o uso no esquema de controle direto de torque com modulação por vetores espaciais apresentado por J. Rodriguez e outros em 2004. Apresenta-se também um estudo comparativo da resposta dinâmica de vários esquemas de controle direto de torque (DTC) para o motor de indução trifásico. O controlador FPIA determina dinâmicamente o ângulo de carga existente entre os vetores espaciais dos fluxos do estator e do rotor e, em consequência, o torque eletromagnético necessário para suprir a carga do motor. A base de regras para o controlador proposto é definida em função do erro "e" e da variação do erro "??" do torque eletromagnético usando funções de pertinência triangulares e trapezoidais. O controle é realizado em frequência de chaveamento constante e apresenta baixa ondulação de torque usando modulação em largura de pulsos por vetores espaciais. O desempenho do DTC com o controlador proposto é comparado com o desempenho do mesmo esquema usando o controlador PI através de várias medidas de desempenho tais como tempo de acomodação, tempo de subida e o índice integral do tempo multiplicado pelo valor absoluto do erro (ITAE). Foram realizadas simulações em diferentes condições de operação que mostram que o controlador proposto assegura uma resposta rápida com baixa ondulação do torque em comparação com o controlador PI, ambos aplicados ao mesmo esquema DTC
Abstract: This dissertation presents the performance of a self-tuning PI type fuzzy controller (STPIF) for the direct torque control (DTC) with space vector modulation (SVM) scheme presented by J. Rodriguez et al. in 2004. It is also presented a comparative study of the dynamic response of various DTC schemes for the three-phase induction motor. The STPIF controller determines dynamically the load angle between the stator and rotor flux space vectors and, consequently, the electromagnetic torque necessary to supply the motor load. The rule base for the proposed controller is defined in terms of error "e" and the change of the error "??" of electromagnetic torque using triangular and trapezoidal membership functions. Constant switching frequency and low torque ripple are obtained using SVM. The performance of the DTC-SVM with the proposed controller is compared with the performance of the same scheme but using PI controller in terms of several performance indexes such as settling time, rise time and integral-of-time multiplied by the absolute magnitude of the error index (ITAE). The simulation results show that the proposed controller ensures fast torque response and low torque ripple when compared to the PI controller, both implemented in the same DTC-SVM scheme
Mestrado
Energia Eletrica
Mestre em Engenharia Elétrica

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Molaei, Hamid. "Control of Induction Motor Drives in the Field Weakening Region Fed by a Boost Converter." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Induction motors are usually fed by voltage source inverters. In some cases, it is necessary to increase the speed of the motor beyond the rated speed. This could be done by increasing the supply voltage (which is not always possible) or by field weakening. Field weakening algorithms are desirable since the current and the voltage of the motor cannot exceed the rated values. However, the range of the controlled speed is limited because of the limitation of the input voltage of the inverter. In this project, considering the limitation of current and voltage, the fundamentals of the field weakening in induction motor are reviewed. Th motor performance is evaluated under a variable range of the input DC voltage. A three-phase boost converter is used to regulate the input DC voltage of the inverter. In fact, when the requested voltage of the control algorithm is greater than the producible voltage of the inverter, the input DC voltage of the inverter is increased by the boost converter. The performance of this drive is evaluated in terms of current, torque and speed of induction motor. Besides, the efficiency of the drive is discussed.

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Herwald, Marc A. "Control Design and Analysis of an Advanced Induction Motor Electric Vehicle Drive." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/32934.

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This thesis is about the development and performance enhancement of an induction motor electric vehicle drive system. The fundamental operation of the induction motor drive hardware and control software are introduced, and the different modulation techniques tested are described. A software simulation package is developed to assist in the control design and analysis of the drive system. Next, to establish the efficiency gains obtained by using space vector modulation in the improved drive system, an inverter with hysteresis current control is compared to the same inverter with space vector modulation in steady state and on separate driving profiles. A method for determining induction motor harmonic losses is introduced and is based on obtaining the phase current harmonics from sampled induction motor stator phase currents obtained. Using a semi-empirical loss model, the induction motor losses are compared between different pulse width modulation control strategies throughout the torque versus speed operating region. Next, several issues related to the robustness of the control design are addressed. To obtain good performance in the actual vehicle, a new method for driveline resonance compensation is developed and proven to work well through simulation and experiment. Lastly, this thesis discusses the development of a new method to compensate for the gain and phase error obtained in the feedback of the d-axis and q-axis stator flux linkages. Improved accuracy of the measured stator flux linkages will be shown to improve the field oriented controller by obtaining a more accurate measurement of the feedback electromagnetic torque.
Master of Science

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Pelegrin, Jessé de. "Uma nova estratégia de controle baseado em modelo de perdas para melhoria de eficiência energética em motores de indução." Universidade Tecnológica Federal do Paraná, 2013. http://repositorio.utfpr.edu.br/jspui/handle/1/703.

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Este trabalho desenvolve um novo método de controle de eficiência energética no acionamento de motores de indução. Esta técnica utiliza um modelo de perdas e uma estrutura de controle baseada no mínimo consumo de energia elétrica. Em um primeiro momento, são apresentados os estudos com os principais controladores de eficiência energética da última década. Depois, são apresentados os modelos elétricos e mecânicos do motor de indução trifásico, a partir do modelo clássico, com o eixo de referência qd0. O controlador utilizado, é o controle por campo orientado indireto (IFOC - Indirect Field Oriented Control), composto por uma malha externa de controle de velocidade e fluxo, e uma malha interna de controle de correntes, que demonstram um bom desempenho de torque e velocidade. Por se tratar de um controlador IFOC, onde os parâmetros do motor são fundamentais para obter bons resultados, o ensaio do motor de indução é realizado e apresentado. Sabendo-se das principais fontes de perdas do motor, o controlador de eficiência energética pode ser elaborado. O controlador baseado no modelo de perdas (LMC -Loss-Model-Based Control) é descrito, assim como o controlador de busca recursiva (SC - Search Control), ambos muito utilizados na literatura. O LMC proposto é implementado através de curvas padrão de fluxo ótimo baseado na potência absorvida, dependendo da carga no eixo do motor, uma nova curva padrão é utilizada. O controlador de eficiência proposto chamado de (MBC - Model Based Control), utiliza o método LMC com um controlador IFOC, este é simulado via software Matlab e verificado experimentalmente através de uma plataforma de acionamento projetada e montada, conforme o projeto descrito. O controlador de eficiência proposto, é comparado com o acionamento de fluxo constante e com o controlador SC, para diferentes perfis de carga no eixo. Para todos os casos o controlador proposto, apresentou o melhor rendimento da máquina.
This paper develops a new method of controlling the drive energy efficiency of induction motors . This technique uses a model of losses and a control structure based on minimum energy consumption . At first , studies with the main drivers of energy efficiency in the last decade are presented . Then the electrical and mechanical models of three-phase induction motor are presented , from the classic model , with the reference axis qd0 . The controller used is an indirect field-oriented control (IFOC), composed of an outer control loop speed and flow , and an inner current control loop , showing a good performance of torque and speed. Because it is a IFOC controller, where the engine parameters are critical to obtain good results , the testing of induction motor is carried out and presented . Knowing the main sources of losses of the engine, the controller of energy efficiency can be drawn . The loss model based (LMC) controller is described , as well as the controller recursive search (SC), both widely used in the literature . The LMC proposed is implemented through optimum standard curves of flow based on power absorbed. Depending on the load on the motor shaft , a new standard curve is used . The proposed controller called efficiency ( MBC - Model Based Control ) uses the LMC method with a IFOC controller , this is simulated via textit software emph Matlab and verified experimentally through a platform drive designed and assembled , as the project described . The controller proposed efficiency is compared with the drive and the constant flow controller SC to different profiles of the axle. For all cases, the proposed controller showed the best performance of the machine.

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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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Pina, Ortega Alejandro Jose. "Design and Comparison of Induction Motor and Synchronous Reluctance Motor for Variable Speed Applications: Design Aided by Differential Evolution and Finite Element Analysis." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1365429279.

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Pinheiro, Diego Dias. "Análise e proposição de estratégias de estimação e controle de velocidade para motores de indução trifásicos." Universidade Tecnológica Federal do Paraná, 2016. http://repositorio.utfpr.edu.br/jspui/handle/1/1765.

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CAPES; Fundação Araucária
Este trabalho apresenta a proposta de servomecanismos de velocidade sem o uso de sensores mecânicos (sensorless) utilizando motores de indução trifásicos. É realizada a comparação e proposição de técnicas para estimação de velocidade rotórica, analisando o desempenho em diferentes condições de velocidade e de carga. Para a determinação da técnica de controle, inicialmente, é realizada uma análise da literatura das principais técnicas de controle e estimação de velocidade utilizadas, apresentando suas características e limitações. A técnica proposta para o servomecanismo de velocidade sensorless com motor de indução utiliza controle de campo orientado indireto (IFOC), composto de quatro controladores do tipo proporcional-integral (PI): controlador de fluxo rotórico, controlador de velocidade e controladores de corrente no eixo direto e em quadratura. Como o foco principal do trabalho está na malha de controle de velocidade, foi implementado no Matlab® o algoritmo de mínimos quadrados recursivo (RLS) para identificação dos parâmetros mecânicos, tais como: momento de inércia e coeficiente de atrito. Com isso, os ganhos do controlador da malha externa de velocidade podem ser auto ajustados para compensar eventuais variações dos parâmetros mecânicos. Para a estimação de velocidade são analisadas as técnicas: MRAS por fluxos rotóricos, MRAS por força contra eletromotriz (fcem), MRAS por potência reativa instantânea, escorregamento, phase locked-loop (PLL) e modos deslizantes. É apresentada uma proposição de estimação de velocidade baseada em modos deslizantes, onde é realizada uma modificação na estrutura do observador de fluxo rotórico. Para avaliação das técnicas são realizadas análises teóricas no ambiente de simulação de Matlab® e experimentais na plataforma de acionamentos de máquinas elétricas. O DSP TMS320F28069 foi utilizado para implementação experimental das técnicas de estimação de velocidade e verificação do desempenho das mesmas em uma larga faixa de velocidade, incluindo inserção de carga. A partir dessa análise é realizada a implementação em malha fechada controle de velocidade sensorless com estrutura IFOC. Os resultados demonstraram a real possibilidade de substituição de sensores mecânicos pelas técnicas de estimação propostas e analisadas. Dentre estas, o estimador baseado em PLL demonstrou o melhor desempenho em diversas condições, enquanto a técnica baseada em modos deslizantes apresenta boa capacidade de estimação em regime permanente e robustez a variações paramétricas.
This study presents a proposal of speed servomechanisms without the use of mechanical sensors (sensorless) using induction motors. A comparison is performed and propose techniques for pet rotor speed, analyzing performance in different conditions of speed and load. For the determination of control technique, initially, is performed an analysis of the technical literature of the main control and speed estimation used, with their characteristics and limitations. The proposed technique for servo sensorless speed induction motor uses indirect field-oriented control (IFOC), composed of four controllers of the proportional-integral type (PI): rotor flux controller, speed controller and current controllers in the direct and quadrature shaft. As the main focus of the work is in the speed control loop was implemented in Matlab the recursive least squares algorithm (RLS) for identification of mechanical parameters, such as moment of inertia and friction coefficient. Thus, the speed of outer loop controller gains can be self adjusted to compensate for any changes in the mechanical parameters. For speed estimation techniques are analyzed: MRAS by rotóricos fluxes MRAS by counter EMF, MRAS by instantaneous reactive power, slip, locked loop phase (PLL) and sliding mode. A proposition of estimation in sliding mode based on speed, which is performed a change in rotor flux observer structure is displayed. To evaluate the techniques are performed theoretical analyzes in Matlab simulation environment and experimental platform in electrical machinery drives. The DSP TMS320F28069 was used for experimental implementation of speed estimation techniques and check the performance of the same in a wide speed range, including load insertion. From this analysis is carried out to implement closed-loop control of sensorless speed IFOC structure. The results demonstrated the real possibility of replacing mechanical sensors for estimation techniques proposed and analyzed. Among these, the estimator based on PLL demonstrated the best performance in various conditions, while the technique based on sliding mode has good capacity estimation in steady state and robustness to parametric variations.

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Esteves, Lucas Mangili [UNESP]. "Acionamento de motor de indução trifásico, sujeito a falhas, utilizando controle com estrutura variável e modos deslizantes." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/148779.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Este trabalho apresenta uma análise do motor de indução trifásico (MIT), que é um dos motores mais utilizados em aplicações industriais, e de diferentes metodologias de controle de velocidade aplicadas para este tipo de motor. A princípio realizou-se um estudo do funcionamento do MIT sem nenhum tipo de controle, para somente depois analisar-se tanto técnicas clássicas e já bastante difundidas no controle deste tipo de máquina como também um tipo específico de controlador robusto, a fim de utilizá-lo para substituir os controladores clássicos na intenção de obter-se um desempenho superior. O controlador robusto escolhido foi do tipo com Estrutura Variável e Modos Deslizantes (CEV-MD). Este trabalho foca no estudo do Controle Vetorial Indireto com Orientação sobre o Fluxo do Rotor, sendo utilizados juntamente deste método um controlador clássico (do tipo PI, Proporcional Integral) e o controlador robusto projetado (do tipo CEV-MD), no intuito de realizar-se uma comparação entre o desempenho dos dois controladores mediante diferentes condições de operação, incluindo-se variação de parâmetros do motor e falhas de queda de tensão nos terminais da máquina. Todos os estudos e projetos resultaram em um conjunto de simulações no ambiente MATLAB/Simulink, a partir das quais constatou-se que o controlador robusto projetado apresentou um desempenho um pouco superior ao do PI, tanto no controle da velocidade quanto em relação a tolerar as falhas de queda de tensão.
This paper presents a three phase induction motor analysis, one of the most used machines in industries applications, and also shows different speed control methods for this kind of machine. At first a study about the IM (induction motor) was made without any control technique, and then an analysis of the classic and well known methods is presented, as well as an analysis of a robust controller, in order to replace the classic controllers by this one and achieve better performance. The chosen robust controller was a Variable Structure Controller with Sliding Mode. This paper focus is the study of the Indirect Vector Control with Rotor Orientation, which was used along a classic controller (PI – Proportional Integral) and the above proposed robust controller, in order to make a balance between both considering several operational conditions, including parameters variation and a particular fault (voltage drops on the motor terminals). All the analysis culminated in a set of simulations on the MATLAB/Simulink ambient, from which it was observed that the proposed robust controller showed a better performance than the PI, both on the speed control and the voltage drops faults tolerance.

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Esteves, Lucas Mangili. "Acionamento de motor de indução trifásico, sujeito a falhas, utilizando controle com estrutura variável e modos deslizantes /." Ilha Solteira, 2017. http://hdl.handle.net/11449/148779.

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Orientador: José Paulo Fernandes Garcia
Resumo: Este trabalho apresenta uma análise do motor de indução trifásico (MIT), que é um dos motores mais utilizados em aplicações industriais, e de diferentes metodologias de controle de velocidade aplicadas para este tipo de motor. A princípio realizou-se um estudo do funcionamento do MIT sem nenhum tipo de controle, para somente depois analisar-se tanto técnicas clássicas e já bastante difundidas no controle deste tipo de máquina como também um tipo específico de controlador robusto, a fim de utilizá-lo para substituir os controladores clássicos na intenção de obter-se um desempenho superior. O controlador robusto escolhido foi do tipo com Estrutura Variável e Modos Deslizantes (CEV-MD). Este trabalho foca no estudo do Controle Vetorial Indireto com Orientação sobre o Fluxo do Rotor, sendo utilizados juntamente deste método um controlador clássico (do tipo PI, Proporcional Integral) e o controlador robusto projetado (do tipo CEV-MD), no intuito de realizar-se uma comparação entre o desempenho dos dois controladores mediante diferentes condições de operação, incluindo-se variação de parâmetros do motor e falhas de queda de tensão nos terminais da máquina. Todos os estudos e projetos resultaram em um conjunto de simulações no ambiente MATLAB/Simulink, a partir das quais constatou-se que o controlador robusto projetado apresentou um desempenho um pouco superior ao do PI, tanto no controle da velocidade quanto em relação a tolerar as falhas de queda de tensão.
Mestre

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Martins, Orlando Saccol. "Comparação de técnicas de controle de velocidade sensorless aplicadas a motores de indução em plataforma DSP." Universidade Federal de Santa Maria, 2006. http://repositorio.ufsm.br/handle/1/8449.

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This work proposes a comparative performance analysis of control and estimation techniques applied to three-phase induction motors with discrete realization, using a fixed-point digital signal processor based platform. Some modifications in original algorithms are proposed to improve the performance of the techniques in study. Initially, an historical review about the induction motors drives and a bibliographical review of the main speed estimation techniques implemented in DSP were accomplished. Then, different models of the induction machine are obtained using the semi-stationary reference frames. From the machine model, two speed controllers are projected: a classical PI controller, that is widely used in industrial environment and a robust model reference adaptive controller, objecting to compensate disturbances and unmodeled dynamics. After that, two estimation techniques based on 1M model are selected to project high-performance speed sensorless drives and later comparison. One of these schemes is extremely spread in academic and industrial environrnents, it is based on a model reference adaptive system (MRAS) and the other one is projected from a modified recursive least squares (MRLS), that is presented as a highperformance altemative solution. In the development of this work are displayed simulation results using the MatlabTM software, real-time simulations in DSP platform, and finally, experimental results. After these results analysis, it is possible to determinate which of these sensorless speed controllers proposed present satisfactory dynamic response for a wide range of speed, including low and null rotations, in situations of load disturbances and parametric variation.
Este trabalho propõe uma análise comparativa do desempenho de técnicas de controle e estimação de velocidade, com realização discreta no tempo, aplicadas a motores de indução trifásicos, utilizando plataforma com base em um processador digital de sinais de ponto-fixo. Algumas modificações em algoritmos existentes na literatura são propostas para melhorar o desempenho das técnicas em estudo. Inicialmente, uma revisão histórica sobre a evolução dos sistemas de acionamento para motores de corrente alternada e uma revisão bibliográfica das principais técnicas de estimação de velocidade implementadas em DSP são realizadas. Em seguida, são obtidos diferentes modelos para o motor de indução trifásico representados em referenciais semi-estacionários. A partir do modelo da máquina foram projetados dois controladores de velocidade: um controlador clássico e amplamente utilizado no meio industrial (PI), e, com o objetivo de compensar distúrbios e dinâmicas não modeladas, um controlador adaptativo robusto por modelo de referência (RMRAC) é implementado. Para o projeto de servomecanismos sensorless de alto desempenho, duas técnicas de estimação de velocidade baseadas no modelo do MI foram selecionadas. Uma delas é amplamente difundida. no meio acadêmico e industrial, sendo fundamentada em um sistema adaptativo por modelo de referência (MRAS) e outra tem base em um algoritmo de mínimos quadrados recursivos modificado (MRLS) e é apresentada como uma alternativa de alto desempenho. No desenvolvimento deste trabalho, resultados de simulações utilizando o software Matlab@, simulações em tempo-real em plataforma DSP, e por fim, resultados experimentais são apresentados. A partir destes resultados, parte-se para avaliação para determinar quais dos controladores sensorless analisados apresentam resposta dinâmica satisfatória em uma larga faixa de velocidade, inclusive em condições de velocidade baixa e nula, e também diante de situações de variação de carga e de parâmetros.

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Sguarezi, Filho Alfeu Joãozinho. "O controlador complexo aplicado ao controle vetorial do motor de indução." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258915.

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Orientador: Edson Bim
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: Este trabalho visa o estudo de métodos de projeto de controladores mediante o emprego da função de transferência complexa; o controle em baixas velocidades de um motor de indução trifásico orientado no fluxo do rotor, bem como no do estator, é o objetivo a ser alcançado. A formulação do modelo vetorial do motor de indução com emprego da função de transferência complexa e do controle vetorial são apresentados. Para validar a proposta, um controlador de ganho proporcional complexo é realizado. Resultados de simulação e de experimentos são obtidos
Abstract: This work aims the study of tunning methods for controllers on vector control using the complex transfer function; low speed control by using the rotor or stator flux orientation on the induction motor is the objetctive. The complex transfer function formulation, its aplication on induction machine model and vector control are presented. To validate the proposal, a proportional complex gains is proposed. Simulation and experimentally results are presented.
Mestrado
Energia Eletrica
Mestre em Engenharia Elétrica

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Oliveira, Jacson Luís de. "Avaliação de estratégias de controle do motor de indução monofásico." Universidade do Estado de Santa Catarina, 2013. http://tede.udesc.br/handle/handle/2074.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
The goal of the present work is to evaluate control schemes which were developed to control the three-phase induction motor, applied in this work to control the single-phase induction motor. The development of control schemes to control fractional power electrical machines such as the single-phase induction motor has been in evidence due to the needs of improvements on efficiency energy demanded by the market. The constructive aspects of this motor does not allow to apply control schemes directly. Thus, it is necessary to model the single-phase induction motor as a two-phase motor. The model considers coordinates transformations to stationary systems. To fix the asymmetry of the motor windings, a symmetry transformation is required to apply the control schemes. Classical control schemes based on field-oriented control and direct torque control were evaluated. Numerical simulations were performed to review how these control schemes work and to verify the feasibility of experimental implementation. For control schemes based on field-oriented control, the rotor flux oriented control and the stator flux oriented control were evaluated. Some constraints on the classical direct torque control were noted due to the high switching frequencies. An alternative to the classical direct torque control to allow constant switching frequencies was evaluated. Experimental results were found by using a hardware system based on digital signal processor.
Este trabalho tem por objetivo avaliar estratégias de controle, originalmente desenvolvidas para controlar o motor de indução trifásico, aqui aplicadas ao controle motor de indução monofásico. O desenvolvimento de estratégias que abordam o controle de motores de potência fracionária tal como o motor de indução monofásico tem tido maior destaque devido a necessidade de melhorias na eficiência energética exigida pelo mercado. As características construtivas deste motor não permitem a aplicação direta destas estratégias, de modo que o modelamento do motor de indução monofásico deve ser realizado afim de obter o modelo em sua configuração bifásica. O modelo considera a transformação de coordenadas para um sistema de eixo estacionário e, para compensar a assimetria dos enrolamentos uma transformação de simetria é necessária para a aplicação das estratégias de controle. Foram avaliadas estratégias clássicas baseadas no controle por orientação de campo e controle direto de torque. Um estudo de simulação numérica é realizado para avaliar o comportamento destas estratégias de controle e verificar a viabilidade de implementação prática. Nas estratégias de controle por orientação de campo são analisados o controle vetorial com orientação por fluxo de rotor e o controle vetorial com orientação por fluxo de estator. Observou-se que há restrições na implementação prática de estratégias de controle baseadas no controle direto de torque clássico devido as altas freqüências de chaveamento requeridas. Uma alternativa ao controle direto de torque clássico que permite o uso de frequências fixas de chaveamento é avaliada. Resultados experimentais foram obtidos utilizando uma plataforma de hardware com processador digital de sinais.

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Queiroz, Francisco Canind? Holanda de. "Controle vetorial de velocidade de um motor de indu??o trif?sico com estima??o neural de fluxo." Universidade Federal do Rio Grande do Norte, 2008. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15193.

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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior
This work describes the study and the implementation of the speed control for a three-phase induction motor of 1,1 kW and 4 poles using the neural rotor flux estimation. The vector speed control operates together with the winding currents controller of the stator phasis. The neural flux estimation applied to the vector speed controls has the objective of compensating the parameter dependences of the conventional estimators in relation to the parameter machine s variations due to the temperature increases or due to the rotor magnetic saturation. The implemented control system allows a direct comparison between the respective responses of the speed controls to the machine oriented by the neural rotor flux estimator in relation to the conventional flux estimator. All the system control is executed by a program developed in the ANSI C language. The main DSP recources used by the system are, respectively, the Analog/Digital channels converters, the PWM outputs and the parallel and RS-232 serial interfaces, which are responsible, respectively, by the DSP programming and the data capture through the supervisory system
Este trabalho descreve o estudo e a implementa??o de um controle vetorial de velocidade para um motor de indu??o trif?sico de 1.1 kW / 4 p?los utilizando estima??o neural de fluxo do rotor. O controle vetorial de velocidade opera em conjunto com o controle das correntes nos enrolamentos de cada fase do estator. A estima??o neural de fluxo aplicada ao controle vetorial de velocidade tem como objetivo compensar a depend?ncia dos estimadores convencionais em rela??o ?s varia??es nos par?metros da m?quina devido a aumentos de temperatura ou satura??o magn?tica do rotor. O sistema de controle implementado possibilita uma compara??o direta dos respectivos desempenhos de velocidade sob orienta??o do estimador neural em rela??o ao estimador convencional de fluxo. Todo o controle do sistema ? realizado por um programa desenvolvido em linguagem padr?o ANSI C. Os principais recursos do DSP utilizados pelo sistema s?o, respectivamente, os canais de convers?o A/D, as sa?das PWM e as interfaces paralela e serial RS-232, as quais s?o respons?veis, respectivamente, pela programa??o do DSP e a captura de dados atrav?s de um sistema de supervis?o

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Trigui, Rochdi. "Motorisation asynchrone pour véhicules électriques : modélisation, optimisation et évaluation." Vandoeuvre-les-Nancy, INPL, 1997. http://www.theses.fr/1997INPL064N.

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Notre travail a porté sur la contribution à la conception d'un outil modulaire pour la simulation de véhicules électriques et hybrides sur des trajets d'usage réel. Notre apport a concerné plus précisément la motorisation asynchrone dont le modèle proposé ici tient compte des contraintes imposées à l'entrée et à la sortie du moteur électrique par le type d'usage du véhicule. En effet, une étude préliminaire concernant l'usage réel d'un véhicule utilitaire électrique de livraison nous a permis de mettre en évidence le domaine et le temps d'utilisation du moteur électrique. Celui ci est amené à fonctionner en surcharge pendant des périodes de courtes durées et à faibles puissances pendant un temps important. Le modèle du moteur asynchrone exposé dans ce travail présente de ce fait des paramètres variables pour tenir compte des phénomènes de saturation magnétique, d'effet de peau dans le rotor et de l'élévation de température. Nous présentons les méthodes pour l'identification de ces paramètres à partir d'essais à vide et en charge du moteur. Les mesures sont effectuées sur un banc d'essai muni d'un onduleur à IGBT et d'une commande vectorielle. Le module de calcul développé autour du modèle identifié permet de calculer les grandeurs électriques et énergétiques en offrant plusieurs possibilités de fonctionnement. Ce module est ensuite intégré dans le logiciel de simulation de véhicules électriques et hybrides VERT de l'INRETS. L'utilisation de ce logiciel nous a permis d'examiner deux solutions à motorisation asynchrone. La première a concerné un véhicule urbain léger dont l'étude des performances et de consommation d'énergie nous ont permis de comparer les différentes stratégies de commandes et de vérifier l'importance de l'usage réel du véhicule. La deuxième a consisté en une chaine de traction à deux moteurs asynchrones pour un véhicule utilitaire de livraison en vue d'une économie d'énergie.

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Lee, Wen-Lung, and 李文龍. "Adaptive Control for Induction Motors Using Principles of Vector Control." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/40166435970034126953.

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碩士
中原大學
電機工程學系
87
On the basis of measurable rotor speed, stator current and stator voltage, the control design methodology for speed tracking and torque tracking problems of induction motors with unknown rotor resistance and loading torque is proposed in this paper. The proposed nonlinear adaptive controller is developed by integrating the design methods of a two-stage design approach and virtual desired variables. Based on the two-stage approach, the speed tracking problem is transformed to an equivalent control problem for torque tracking. The virtual desired variables include desired stator currents and desired rotor fluxes, which are naturally determined under the conditions induced from the principles for vector control. In Chapter 3, we first consider the model of a current-fed induction motor. In the case, a measurable auxiliary signal will be introduced to relate the rotor flux error, whereby the direct feedback of the rotor flux can be avoided. Then the control inputs are chosen for the purpose of steering the state variables toward the desired ones. Under the condition of persistent excitation, this controller structure will provide the properties of asymptotic speed tracking and exponential torque tracking in physical operating conditions, whereas all of the internal signals are bounded. It is worth remarking that no explicit observer for the rotor flux will be constructed in the controller. In Chapter 4, the sliding mode controller is used to substitute the PI-controller. This will maintain good tracking performance when system uncertainty and external disturbance exists. Also, an Extended Kalman Filter is used to estimate the states that are not measurable in the practical system. The results of simulation are shown to demonstrate good transient and steady state responses of the proposed control algorithm. Finally, we make a complete statement and theory proof. The whole induction motor speed and position control system is implemented by using a high-speed digital signal processor TMS320C31 in the dSPACE environment. An induction motor of driver module is used to achieve the control task. We can see from experiments, that these adaptive nonlinear controllers have good performances.

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37

Palani, Vel S. "Self Commissioning, Parameter Adaptation And Sensorless Operation Of Vector Controlled Induction Motor Drives." Thesis, 1996. https://etd.iisc.ac.in/handle/2005/1707.

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Palani, Vel S. "Self Commissioning, Parameter Adaptation And Sensorless Operation Of Vector Controlled Induction Motor Drives." Thesis, 1996. http://etd.iisc.ernet.in/handle/2005/1707.

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39

Chen, Wei-Je, and 陳偉哲. "Sensorless Vector Control for Current-Mode Induction Motors Based on Fuzzy Approach." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/z5z2u2.

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碩士
中原大學
電機工程研究所
93
This thesis presents a current-mode concept and a design method for sensorless induction motors to achieve speed tracking. First, the traditional ideal current loop is replaced by the assumption of allowing a bounded stator voltage and a finite absolute-integral of current tracking error. From this practical current-mode model for the induction motors is used for the controller design. Our objective is to develop a fuzzy observer-based, controller for speed tracking. Second, the fuzzy observer is addressed to estimate the immeasurable states of rotor flux and rotor electric angular speed, whereby zero estimation error is concluded. Third, the controller is proposed by using the design concept of virtual desired variables. In light of this concept, the concept of vector control is presented. The vector control and the fuzzy observer are independently designed. According to the derived stability criterion, the observer gains and control gains are obtained by solving linear matrix inequalities. Finally practical simulations and experiments are found to be consistent with theoretical derivations.

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Chou, Ping-Kuei, and 周炳奎. "THE VECTOR CONTROL OF INDUCTION SERVO MOTOR." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/32046536009375292433.

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41

Wu, Ming-Jheng, and 吳明政. "Induction Motor Driver Design and Vector Control." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/28881638872586406273.

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碩士
國立中正大學
機械工程學系暨研究所
101
This thesis describes how I to creat a vector control system for an induction motor. First analyzed the model of the induction motor, and then research the viability of two control theories, scalar control and vector control. It was decided upon to use vector control. I also researched vector control theory of torque control and speed control. Then I identified the system parameters which are required in order to implement vector control. The experiments used were DC, Stall-signal phase, and no load. Finally I introduced the driver, which was designed by my department. In the implementation I used TMS320- 28335 digital signal processor (DSP) microcontroller, designed by Texas Instruments and the DSP control card which was produced by C.C.U. Auto-Control Lab. I then conducted the induction motor experiments on the driver and firmware in order to verify the feasibility of an induction motor vector control systems via a driver and DSP is acceptable.

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Chen, YaoNan, and 陳耀南. "Design and Implementation of FPGA-Based Sensorless Vector Control Chips for Induction Motors." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/00924836383735396304.

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碩士
國立臺灣科技大學
電機工程系
92
This thesis utilizes FPGA to implement algorithms for both rotor-flux-oriented and stator-flux-oriented sensorless vector control. The algorithms are written in VHDL using Altera Quartus II, which are partitioned into several modules for separate circuit design and verifications and are then combined together into a complete sensorless vector control circuit. To implement VHDL programs, the control algorithms are per unitized and are expressed in 16-bit signed fixed-point formats for execution. The FPGA is connected to a DSP through an expansion bus and, together, they form a hybrid control system. The DSP is responsible for parameter and register read/write, current feedback processing, and PWM signal generation, while the FPGA handles the execution of the complete sensorless vector control algorithms. Experimental results confirm that the execution time of the sensorless vector control algorithms using the DSP-FPGA hybrid control system can be drastically reduced. The proposed control structure contributes to the advancement of digital control performance and control algorithm realization.

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Chiu, Chun-Jung, and 邱俊榮. "Vector Control Design for Induction Motors Using Takagi-Sugeno-Kang Fuzzy Speed Estimator." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/h3exym.

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碩士
國立臺北科技大學
電機工程系研究所
97
In this thesis, the Takagi-Sugeno-Kang fuzzy theory is used to design the TSK fuzzy speed estimator and TSK fuzzy rotor resistance estimator for establishing the speed sensor-less control. Moreover, the projection algorithm in adaptive theory is adopted to modify the parameters of the TSK fuzzy rules in the consequence part. The speed and rotor resistance estimated by the proposed estimator are fed back to the adaptive fuzzy cerebellar model articulation controller (AFCMAC) and pseudoreduced-order flux observer (APRO) in order to achieve the adaptive vector control. The proposed vector control of the motor drive integrates the direct field orientation control (DFOC) and the adaptive control law. Also, an adaptive pseudoreduced-order flux observer (APRO) is used to estimate the rotor flux and solve the problem that the constants of pole assignment must be changed according the speed command; this problem often happens when the adaptive full-order flux observer (AFO) is applied. In addition, the use of APRO reduces the computation time of control algorithm. Under the operation conditions that the speed range varies from 2% to 100% of the rated speed with 8-Nm start-up torque load, the experimental results indicate that the speed not only has superior dynamic response but also remains robustness in the environment of motor parameter variations when the AFCMAC, TSK fuzzy speed estimator, and TSK fuzzy rotor resistance estimators are applied.

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44

Karmazin, Max. "Simplified fuzzy logic controller based indirect vector control of an induction motor drive /." 2003.

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45

Bhattacharya, Tanmoy. "Flux Estimation, Parameter Adaptation And Speed Sensorless Control For Vector Controlled Induction Motor Drive." Thesis, 2005. https://etd.iisc.ac.in/handle/2005/1406.

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Bhattacharya, Tanmoy. "Flux Estimation, Parameter Adaptation And Speed Sensorless Control For Vector Controlled Induction Motor Drive." Thesis, 2005. http://etd.iisc.ernet.in/handle/2005/1406.

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Kuo, Ei-Lang, and 郭益郎. "Speed Sensorless Vector Control of Induction Motor Driver." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/58682933314356013189.

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碩士
淡江大學
機械工程學系
88
The objective of this thesis is to develop a sensorless speed estimator for induction motor drives. From the state equations of the induction motor, we derive the estimation algorithm of which inputs include stator currents and voltages, and rotor flux. In order to reduce the hardware burden, only currents of two phases are measured by using hardware sensors, while the voltages and rotor flux are determined by using software estimates. For the voltage estimation, we utilize the PWM switching states that are created by a DSPC240 controller. On the other hand, a voltage model observer is used for the rotor-flux observation. Because of the insignificant variation of parameters in high frequencies, the voltage model is usually applied in high-speed operation. For the situation of low-speed operation, we propose a compensation method for the flux command. Therefore the zero-crossover speed will be quite smoothly. There are many advantages to measure currents, voltages, and rotor flues by using estimates. We can filter out the external noise by the software estimates and increase the robustness of the system. Furthermore, the omission of the hardware sensor will simplify the system mechanism and reduce the cost price. With the estimated rotor speed, we can form a closed-loop velocity control system that will provide larger torque outputs in low-speed operation than those by a pure V/F control. We develop the servo-controller by using TI DSPC240 to implement the sensorless speed control algorithm. The control command is sent to a power drive made by ITRI, which would regular the motion of an 1-HP induction motor. Experimental results show that the proposed estimates can efficaciously provide the rotor speed in various operational situations.

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Suresh, Banoth. "Sensor Less Vector Control of Induction Motor Based on MRAS Control." Thesis, 2018. http://ethesis.nitrkl.ac.in/9892/1/2018_MT_216EE4294_BSuresh_Sensor.pdf.

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The implementation of vector control technique needs speed information of motor from the tachogenerators, incremental encoders or resolvers to measure the speed. The speed and flux sensors require careful mounting, alignment and it needs special attention to reduce the noise due to electrical phenomenon. The speed sensors require maintenance and extra space for mounting which increases size and cost of drive system in practical implementation. These problems can be eliminated by speed estimation techniques without using any external sensors in machine. It can be achieved by using Model Reference Adaptive System (MRAS) speed estimation technique. MRAS is popularly used for speed estimation to avoid the sensors like flux and speed. MRAS technique consists of two models named as adaptive and reference models. Moreover, it has one adaptive mechanism PI controller to tune the flux error zero. The error generated from these two models will estimate the speed of the induction machine. The conventional MRAS speed estimation method along with Voltage source inverter normally provides poor steady state response of torque waveform and more distortion/ripples in speed, flux and armature current of induction motor in steady state region. To overcome these drawbacks, anew method of Space Vector Pulse Width Modulation (SVPWM) is introduced here. In the present method, stator flux components are the control variables, and these flux components are resolved into reference voltage vectors based on SVPW Mtechnique. Due to this, the performance of MRAS speed estimator can be improved and speed disturbances are minimized, and also reduce the ripples present in torque and stator currents of the induction motor drive. Also, it has good tracking of rotor speed and reaches to steady state quickly as shown in simulation results carried out by MATLAB/SIMULINK.

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袁德威. "The DSP Controller Based AC Induction Motor Vector Control." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/64557353708022332455.

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碩士
逢甲大學
電機工程學系
87
The purpose of this thesis is to implement a DSP-based induction motor vector control, with the inclusion of the rotor flux orientation method. With the structure of the vector control, the current controller, the flux controller and the speed controller will be analyzed and designed in detail. In order to cope with the design methodology, each controller will be simulated by using the MATLAB/SIMULINK software package for different parameters. The induction motor vector controller designed in this thesis consists of two parts, hardware and software. For the hardware aspect, DSP controller, protective circuit, current sensor circuit, power module, and the related digital peripheral circuits will be included. The inner loop control for calculating the values of and , current controller, flux controller and speed controller, and the outer loop control for calculating the electrical and mechanical speed, both are for the software aspect considered. Finally, a three-horsepower four-pole induction motor with vector control will be demonstrated and verified with the parameters calculated and obtained from the simulation.

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HUANG, ZHI-YI, and 黃志毅. "Induction motor speed control by using instantaneous voltage vector." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/94256947442840820862.

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