Dissertations / Theses on the topic 'Direct Scalar Torque Control'
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Vidlák, Michal. "Modely řízení asynchronního motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-401962.
Full textKoch, Gustavo Guilherme. "Controle escalar sensorless para sistemas de conversão de energia eólica com gerador síncrono de ímãs permanentes." Universidade Federal de Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/8568.
Full textThis master thesis proposes a control method of scalar direct torque control and a technique of current control to maximize the aerodynamic efficiency of wind energy conversion systems (WECS) using permanent magnets synchronous generators (PMSG) with non-salient poles. The maximum power point tracking (MPPT) is possible to apply optimum torque to the generator by just controlling the static converter. Two topologies are addressed: The first one is a boost converter, widely used in WECS, where the MPPT method is implemented by the controlling the boost inductor current; and the second is a three phase AC boost converter where the scalar direct torque control is proposed. Aims to reduce the mechanic speed sensor a work with sensorless algorithms, is proposed. First an observer in the continuous time domain in coordinates αβ is developed containing two observers: a current sliding mode whose function is to determine the electromotive force (EMF) and EMF observer which aims to determine the rotor speed based on the direct method of Lyapunov. After, in the discrete time domain, sliding mode observers of speed and rotor position are described. Simulation and experimental results are presented to validate the theoretical analysis and demonstrate the good performance of the techniques to drive PMSG.
Esta dissertação propõe um método de controle escalar direto de conjugado e uma técnica de controle de corrente para maximização da eficiência aerodinâmica de sistemas de conversão de energia eólica (WECS) que utilizam geradores síncronos de ímãs permanente (PMSG) com polos não salientes. O rastreamento do ponto de máxima potência (MPPT), impõe o conjugado ótimo ao gerador apenas por meio do controle do conversor estático. Duas topologias são abordadas: conversor boost, amplamente utilizado em WECS, em que o método de MPPT é implementado por meio do controle da corrente do indutor boost, e um conversor boost trifásico CA, com controle escalar direto de torque. Buscando reduzir os sensores mecânicos do sistema, estimadores para obtenção da velocidade e da posição rotórica são propostos. Primeiramente um observador no domínio de tempo contínuo em coordenadas αβ é desenvolvido, contendo dois observadores: um de corrente por modos deslizantes, cuja função é determinar a força eletromotriz (EMF) e um observador de EMF, baseado no método direto de Lyapunov, com objetivo de determinar a velocidade rotórica. Posteriormente são descritos observadores por modos deslizantes no domínio de tempo discreto de velocidade e posição rotórica. Resultados de simulação e experimentais são apresentados para validar a análise teórica e demonstrar o desempenho das técnicas de controle e estimação propostas.
Hořava, Jan. "Modelování a simulace vektorového řízení EC motorů v prostředí Simulink." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229792.
Full textBouallaga, Kamel. "Contribution à l'optimisation de la commande d'un alternateur-démarreur pour automobile." Paris 6, 2003. http://www.theses.fr/2003PA066029.
Full textMagalhães, Pedro Mendes de Lacerda Peixoto de. "Direct torque control em máquinas assíncronas." Master's thesis, Faculdade de Ciências e Tecnologia, 2009. http://hdl.handle.net/10362/3977.
Full textEste trabalho incide sobre o DTC (Direct Torque Control ), técnica de controlo de máquinas eléctricas(polifásicas) de corrente alternada, em particular a máquina assíncrona, e o seu objectivo é construir bases para trabalho futuro nesta área, nomeadamente através da análise crítica dos componentes elementares da técnica e seu desempenho. A realização deste trabalho prevê o estudo teórico do método de controlo e avaliação das suas características a partir de simulação e implementação prática
Abdalla, Abdelnassir. "Torque Ripple Minimization in Direct Torque Control of Induction Machines." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1116121267.
Full textAlam, S. M. Mahfuz. "Direct Torque Control of AC Machine Drives." Thesis, Southern Illinois University at Edwardsville, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10128872.
Full textField oriented control (FOC) and direct torque control (DTC) are the two most important control strategies for modern advanced machine drives. Field oriented control (FOC) has been widely used as the industrial motor drives. The direct torque control has been recently developed by Takashi and has shown great potential in machine drive applications. This thesis discusses the performances of direct torque control on AC machine drives including the industrial workhorse induction machines (IM) and permanent magnet synchronous machines (PMSM). Both of the IM and PMSM dynamics models are derived in details in the thesis. By applying nonlinear filtering techniques, the sensorless direct torque control of AC machine drives are studied. MATLAB simulations have shown the efficacy and superior performance of the resilient extended Kalman filter over the traditional extended Kalman filter for direct torque control applications.
Lüdtke, Ingo. "The direct torque control of induction motors." Thesis, University of South Wales, 1998. https://pure.southwales.ac.uk/en/studentthesis/the-direct-torque-control-of-induction-motors(5b85e666-04b6-493b-b615-c5e2144d03c6).html.
Full textArias, Pujol Antoni. "Improvements in direct torque control of induction motors." Doctoral thesis, Universitat Politècnica de Catalunya, 2001. http://hdl.handle.net/10803/6317.
Full textClassical Direct Torque Control has inherent disadvantages such as: problems during starting resulting from the null states, the compulsory requirement of torque and flux estimators, and torque ripple. In the classical DTC induction motor drive a voltage vector is applied for the entire period, and this causes the stator current and electromagnetic torque exceeds its reference value early during the cycle, causing a high torque ripple. Switching cycles then follows this, in which the zero switching vectors are applied in order to reduce the electromagnetic torque to reference value. This thesis suggests a technique based on applying to the inverter the selected active states just enough time to achieve the torque and flux references values. The rest of the switching period a null state is selected which won't almost change both the torque and the flux. Therefore, a duty ratio has to be determined each switching time. By means of varying the duty ratio between its extreme values (0 up to 1) it is possible to apply any voltage to the motor. The optimum duty ratio per sampling period is a non-linear function of the electromagnetic torque error, the stator flux position and the working point, which is determined by the motor speed and the electromagnetic torque. It is obvious that it is extremely difficult to model such an expression since it is a different non-linear function per working point. Therefore, this thesis is focused on performing a fuzzy-logic-based duty-ratio controller, where the optimum duty ratio is determined every switching period. Additionally, this Fuzzy Controller is adaptive and may be applied to any induction motor.
A stator flux reference optimum controller is also designed, which not only helps to achieve a smaller torque ripple, but also reduces the reactive power consumption of the drive taken from the main supply. This is achieved by changing the stator flux reference value with reference being made to the correspondent torque reference value. Therefore, the stator flux reference value chosen is to be just of sufficient value to produce the desired torque
Simulated results are shown in order to compare the classical DTC and the Fuzzy Logic based DTC.
The control algorithms have been implemented on a PC/DSP based board that facilitates the use of parallelism in software design. A 1.5kW, three-phase induction motor drive has been designed and experimental data obtained from it in order to verify the results achieved by simulation.
del, Toro GarciÌa Xavier. "Improvements in direct torque control of induction motors." Thesis, University of South Wales, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.446106.
Full textOkumus, Halil Ibrahim. "Improved direct torque control of induction machine drives." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364958.
Full textTsoutsas, Athanasios. "Designing a sensorless torque estimator for direct torque control of an induction motor." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FTsoutsas.pdf.
Full textThesis Advisor(s): Julian, Alexander L. "September 2009." Description based on title screen as viewed on November 5, 2009. Author(s) subject terms: Induction Motor, Electromagnetic Torque Estimator, Field Programmable Gate Array (FPGA), XILINX. Includes bibliographical references (p. 59). Also available in print.
Mascarenhas, Manuel Maria Brás Pereira. "Speed control of induction machine based on direct torque control method." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/9957.
Full textMulti-level converters have been receiving attention in the recent years and have been proposed as the best choice in a wide variety of medium voltage applications. They enable a commutation at substantially reduced voltages and an improved harmonic spectrum without a series connection of devices, which is the main advantage of a multi-level structure. The use of multi-level inverters contributes to the performances amelioration of the induction machine control. In fact, the use of three level inverter (or multilevel inverter) associated with DTC control can contribute to more reducing harmonics and the ripple torque and to have a high level of output voltage. A variation of DTC-SVM with a three level neutral point clamped inverter is proposed and discussed in the literature. The goal of this project is to study, evaluate and compare the DTC and the proposed DTC-SVM technique when applied to induction machines through simulations. The simulations were carried out using MATLAB/ SIMULINK simulation package. Evaluation was made based on the drive performance, which includes dynamic torque and flux responses, feasibility and the complexity of the systems.
Ocen, David. "Direct Torque Control of a Permanent Magnet synchronous Motor." Thesis, KTH, Reglerteknik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-109456.
Full textYu, Jian. "Direct torque control of brushless doubly-fed reluctance machines." Thesis, Northumbria University, 2004. http://nrl.northumbria.ac.uk/897/.
Full textAbdollahzadeh, Zare Mohammad. "FPGA-Based Simulation and Implementation of Induction Motor Torque Control Systems Based on Direct Torque Control (DTC)." Thesis, North Dakota State University, 2014. https://hdl.handle.net/10365/27275.
Full textLiu, Yong. "Direct torque control of permanent magnet brushless AC/DC drives with reduced torque ripple." Thesis, University of Sheffield, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.630444.
Full textBouwer, Pieter. "Modelling, design and implementation of a small-scale, position sensorless, variable speed wind energy conversion system incorporating DTC-SVM of a PMSG drive with RLC filter." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80242.
Full textWind energy has proven to be a viable source of clean energy, and the worldwide demand is growing rapidly. Variable speed topologies, with synchronous generators and full-scale converters, are becoming more popular, and the e ective control of these systems is a current trend in wind energy research. The purpose of this study is the modelling, design, simulation and implementation of a small-scale, variable speed wind energy conversion system, incorporating the position sensorless direct torque control with space vector modulation, of a permanent magnet synchronous generator, including an RLC converter lter. Another aim is the development of a gain scheduling algorithm that facilitates the high level control of the system. Mathematical models of the combined lter-generator model, in the stationary and rotating reference frames, are presented and discussed, from which equivalent approximate transfer functions are derived for the design of the controller gains. The design of the controller gains, RLC lter components, gain scheduling concept and maximum power point tracking controller are presented. It is discovered that the RLC lter damping resistance has a signi cant e ect on the resonance frequency of the system. The system is simulated dynamically in both Simulink and the VHDL-AMS programming language. Additionally, the maximum power point tracking controller is simulated in the VHDL-AMS simulation, including a wind turbine simulator. The simulation results demonstrate good dynamic performance, as well as the variable speed operation of the system. The practical results of torque and speed controllers show satisfactory performance, and correlate well with simulated results. The detailed gain scheduling algorithm is presented and discussed. A nal test of the complete system yields satisfactory practical results, and con rms that the objectives of this thesis have been reached.
Wong, Wallace Shung Hui. "Improved direct torque control and robust adaptive control of induction motor drives." Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271811.
Full textLi, Yaohua [Verfasser]. "Direct Torque Control of Permanent Magnet Synchronous Machine / Yaohua Li." Aachen : Shaker, 2010. http://d-nb.info/1081886862/34.
Full textPham-Dinh, Truc. "Direct torque control of induction machines considering the iron losses." Thesis, Liverpool John Moores University, 2003. http://researchonline.ljmu.ac.uk/4969/.
Full textMelin, Alexander M. "On direct adaptive control of a class of nonlinear scalar systems /." free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p1418051.
Full textOrtega, Garcia Carlos. "Direct torque control of permanent magnet synchronous machines using Matrix Converters." Doctoral thesis, Universitat Politècnica de Catalunya, 2008. http://hdl.handle.net/10803/22732.
Full textThe control of AC machine drives is a continuously advancing subject satisfying increasing high performance applications demands. Induction Motor (IM) drives with cage-type machines has been the workhorses of industrial variable speed drives applications, including pumps and fans, paper and textile mills, electric vehicles, locomotive propulsion, wind generation systems, etc. In addition to performance requirements, energy saving aspects of variable speed drives is gaining attention nowadays. Permanent Magnet Synchronous Machines (PMSM) are becoming a very attractive alternative to IM. Among other advantages, these type of machines offer higher efficiency, high power density and very fast dynamic performance. PMSM, in particular in the low power range, are already widely used in industry and recently, the interest in their application is growing, particularly up to 100 kW. Variable speed drives fed by voltage source inverters has been traditionally employed in industrial applications. In the past few years, matrix converters have emerged to become a close competitor to the conventional inverter. A matrix converter is an advanced circuit topology capable of converting AC-AC, providing generation of load voltage with arbitrary amplitude and frequency, bi-directional power flow, sinusoidal input/output waveforms, and operation under unity input power factor. Furthermore, since no inductive or capacitive elements are required, MC allows a very compact design. There are several methods to control AC machines, vector control methods being the most suitable for high performance demands. Among others, field oriented control and direct torque control are the most widely used. Although being one of the emerging control techniques for industrial applications, the direct torque control has some inherent drawbacks that are still being investigated by researchers. The work reported in this thesis is devoted to the investigation of direct torque control of PMSM drives fed by matrix converters. This work considers the replacement of the conventional voltage source inverter by a matrix converter. The features of matrix converters are exploited to reduce the inherent electromagnetic torque and stator flux ripples arising from the direct torque control driving a PMSM. A new direct torque control using small and large voltage vectors of matrix converters has been developed during the course of this work. The undesirable effects of the common mode voltage related with the utilization of the conventional voltage source inverter, like electromagnetic interferences and the machine early failures, are other issues with which this work is also concerned. A very simple algorithm to reduce the common mode voltage in direct torque control drives using matrix converters is developed and investigated in this work. The main limitation of all sensorless vector control schemes, based on the conventional fundamental frequency models or observers, is that they fail at very low speeds. The desirability to operate continuously at low or zero speed has led to another sensorless approaches where the saliency of the machine is tracked through some form of signal injection to obtain flux or position information. A new algorithm to inject a rotating vector in the a-b frame when employing a direct torque control has been developed in this thesis.
Fuengwarodsakul, Nisai. "Predictive PWM-based direct instantaneous torque control for switched reluctance machines /." Aachen : Shaker, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016167111&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textDever, Timothy P. "Direct Torque Control of Resonant Inverter Driven Permanent Magnet Synchronous Motor." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1586426523199448.
Full textAbosh, Atheer. "Direct and indirect torque control of unbalanced permanent magnet synchronous machines." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/15245/.
Full textPurcell, 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.
Full textZhao, Jibo. "An Efficient Wide-Speed Direct Torque Control Based on Fuzzy Logic Technique." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1352922315.
Full textRen, Yuan. "Direct torque control of dual three-phase permanent magnet synchronous machine drives." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/12190/.
Full textAndrews, Darin M. "Direct torque control of a three-phase voltage source inverter-fed induction machine." Thesis, Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/38872.
Full textThe scope of this thesis involves various techniques to control the torque of a voltage source inverter-fed induction motor. The three methods investigated here are voltage by frequency, known as scalar control, field-oriented control with and without space vector modulation, and direct torque control. Although all three techniques have been proven effective, each technique possesses its own advantages and disadvantages. In todays engineering world, time and money are saved by utilizing software developed to accurately model a physical system and to compare with hardware previously implemented in a lab. Comparisons can be made to determine how each of these torque control methods perform under static and dynamic modes of operation. The United States military can benefit from this study by modifying or adding onto the software models developed here with little cost and use these models to do trade studies without the cost of lab demonstrations.
Fuengwarodsakul, Nisai [Verfasser]. "Predictive PWM-based Direct Instantaneous Torque Control for Switched Reluctance Machines / Nisai Fuengwarodsakul." Aachen : Shaker, 2007. http://d-nb.info/1166509796/34.
Full textOzturk, Salih Baris. "Direct torque control of permanent magnet synchronous motors with non-sinusoidal back-EMF." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2728.
Full textPark, Joon B. "Fault-Tolerant Nonlinear Estimator-Based Direct Torque Control of Sensorless AC Motor Drives." Thesis, Southern Illinois University at Edwardsville, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10982121.
Full textThe advancement of sophisticated power electronics technology and high expectation of sensing reliability attribute to the rapid deployment of sensorless-control of AC motor drives. The purpose of this thesis is to provide the comparative studies of the extended Kalman filter (EKF), the fault tolerant extended Kalman filter (FTEKF), and the unscented Kalman filter (UKF)-based sensorless direct torque control approaches for permanent magnet AC motor (PMAC) and induction motor (IM) drives to improve Kalman filtering based state-estimation performances during external disturbances, noise and measurement failures. The proposed fault tolerant Kalman filtering control algorithm is robust to modeling uncertainties and sensing failures. Comparative of computer simulation studies and hardware implementations results have shown that the proposed second-order fault tolerant Kalman filter (SOFTEKF) provide superior state-estimation performance improvements in comparison with the unscented Kalman filter and traditional extended Kalman filter for sensorless direct torque control applications of AC motor drives.
Yun-ChungWeng and 翁允中. "Low Torque Ripple Direct Torque Control for IPM Motor." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/m4fpaq.
Full text史宗岳. "Implementation of Direct Torque Control Inverter." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/02277787858573295118.
Full text國立臺北科技大學
機電整合研究所
86
The objective of this project is to develop a sensorless controller for AC induction motor drives based upon the direct torque control technique. First, auto parameter measuring technique is used to measure parameter of AC motor, then Several inverter control technique, including space vector modulation, random space vector modulation, as well as conventional techique using switching table, are investigated and inverter followed by exploring the control structure of AC drives, subjected to these inverter control techniques. The application of the inverter control technique to AC drives bassed upon direct torque control technique, are investigated in this project. Simulation and experimental results are presented to confirm the theoretical analysis.
Yang, Wei-Chang, and 楊偉昌. "Design of the Direct Torque Control IC." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/90637893026079273341.
Full text國立臺北科技大學
機電整合研究所
92
The main research of the thesis is based on Cell-based digital IC design flow. We use the way to design and make the motor control ic, the ic is Direct Torque Control ASIC. The method of DTC is analysis the mathematic model of induction motor on stator coordinate axis. We use the input voltage and current to control the torque and flux. It’s foundation on Space Vector Modulation. Therefore the DTC ASIC can control the signal by stator torque and stator flux then to bring the on and off signal. After the inverter we can control the induction motor immediately, and the control technology is better. The cost is less and less. First, the system function is programming in the Hardware Description Language（VERILOG）.Then, we use the compiler to confirm the syntax of the VERILOG code, After that, the synthesis tool , auto place & routed and function simulation tool are used to implement the design flow of the Direct Torque Control. We also can be implemented by Filed Programmable Gate Array（FPGA）in hardware. We use the FPGA to replace the design of DTC control IC. Adding the input signal control board by myself then cooperated with the power driver and the induction motor of the three-phase AC power. In the testing system, FPGA generate the control signal to drive the power driver successfully, and the power driver also makes the motor to rotate correctly.
Wang, Deng-Mao, and 王登茂. "Torque Ripple Reduction Design for Direct Torque Control of Induction Motor." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/11893407918422494189.
Full text國立中央大學
電機工程研究所
97
This research investigated the phenomenon of over-large ripple generated by direct torque control operated induction motors, and developed a fixed flux variation direct torque control to sufficiently inhibit the ripple. Direct torque control is uncomplicated, easy to practice, and not affected much by factor variations. However, a huge problem of direct torque control is that switching limited voltage vector results in a torque change, and this change causes noise and vibration of the motor. This problem is usually solved by spatial voltage vector adjusting control, which uses more voltage vector and advanced hysteresis comparators to stablize the variation of flux. However, increasing voltage vector and the level of hystersis comparator cannot eliminate torque ripple efficiently because the switch element cannot follow this rapid adjustment. This thesis proposed fixed flux variation direct torque control to stabilize the flux variation and inhibit torque ripple generation by instant spatial voltage vector computation. The traditional method is used when flux deviation is big; the fixed flux variation method is used when the flux deviation decreases to the targeted range. Therefore, this newly developed method accomplishes both transient and steady state control. This research developed a full-digital drive based on the fixed-point digital signal processor and intelligent power module. This drive not only efficiently simplifies the circuit, it also increases the flexibility of the system. Finally, the experiment confirmed the feasibility of this method.
Brassfield, William R. "Direct torque control for brushless doubly-fed machines." Thesis, 1993. http://hdl.handle.net/1957/36482.
Full textGraduation date: 1993
"Improvements in direct torque control of induction motors." Universitat Politècnica de Catalunya, 2001. http://www.tesisenxarxa.net/TDX-0724101-144636/.
Full textPan, Yi-Cheng, and 潘奕丞. "Hybrid Direct Torque Control for Induction Motor Drives." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/61568632171644115675.
Full text清雲科技大學
電機工程研究所
94
Induction motors have been widely used in industry applications. According to its mechanical structure identities, the induction motor has a lot of advantages such as stable structure, low price, simplicity of maintenance and so on. Recently, direct torque control technique has been well developed. Differently from the field-oriented control (FOC), DTC does not tend to reproduce the electromechanical behavior of a dc motor drive but is aimed at a complete exploitation of the flux and torque-producing capabilities of an induction motor (IM) fed by a pulse width modulation (PWM) inverter. In this case, DTC can be viewed as a novel concept in the control of IM drives. This paper develops a hybrid direct torque control (H-DTC) strategy, which combine the switching-table -based direct torque control (ST-DTC) and the space vector modulation direct torque control (SVM-DTC), for high performance induction motor (IM) drives. A switching logic is designed for choosing either the ST-DTC or SVM-DTC strategy during the drive operation to guaranty transient and steady-state performance. Under transient operating conditions, the fast torque response is preserved by using ST-DTC, while better steady-state performance is achieved by using the SVM-DTC. The effectiveness of the proposed method will be demonstrated by computer simulations and experimental tests.
Chang, Wen-Sheng, and 張文勝. "Direct Torque Control of Permanent Magnet Synchronous Motor." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/29202449038718233363.
Full text國立臺北科技大學
機電整合研究所
88
It is well known that the features of DTC include not requiring complex coordinate transform and decoupling calculations, and with fast torque response. The objective of this thesis is to implement a Permanent Magnet Synchronous Motor (PMSM) based upon Direct Torque Control. The implemented DTC-based PMSM motor drives generates the flux and torque errors, and thereby selecting the switching states via switching table for inverter control. The speed control loop consists of a proportional-integral (PI) controller. The details for the controller design are also explored in this thesis. Experimental results derive d from a PC-based control system are presented to confirm the theoretical analysis and software development, which is developed using Simulink. Experimental results show that the tracking performance of the developed DTC-based PMSM drive is satisfied and confirming the above-mentioned claims.
Chu, Bor-Sen, and 褚柏森. "Application of Induction Motor to Direct Torque Control." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/01311922385082708578.
Full text國立交通大學
電機與控制工程系
89
Direct Torque Control is to use torque and flux magnitude as input commands in the controller, which calculates the voltage vectors for the motor.In this thesis, we deal with the problem of using sliding mode technique to control and observe the states of an induction motor. We hope to directly regulate the rotor torque and the square of the rotor flux magnitude to the desired value. Nonlinear sliding surfaces are chosen and stator voltages are derived such that the state trajectories have a sliding mode behavior for the driving system to achieve the control objective. Because of the rotor fluxes are hard to measure in practice, the reduced order observer is used to estimate the rotor fluxes. Besides, the adaptive MRAC law will be also applied in position tracking control. The simulations of the control structure are implemented by C language. The experimental tools will be divided to two structures. One is built by PC and some interface cards. The other is built by PC and the DSP digital board. The results of simulations and experiments verify the validity and practice of this technique.
Chung, Chao-Wen, and 鍾昭玟. "The Torque Ripple Improvement of Brushless DC Motor by Direct Torque Control Method." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/18374395151700112978.
Full text國立中央大學
電機工程研究所
89
Abstract The paper describes an investigation of direct torque control(DTC) for brushless dc motor (BDCM) drives. The paper implementation two DTC methods and compare the two methods with traditional DTC on torque ripple of BDCM.The implementation of DTC in BDCM drives is discussed and the switching table specific for BDCM is also derived.The simulation and experimental results show that the torque ripple and response are extremely good than traditional DTC.
Huang, Hsin-Wei, and 黃信瑋. "Design of Fuzzy Control System for Induction Motor Direct Torque Control." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/9gzj45.
Full text國立臺北科技大學
電機工程系所
100
The fuzzy control theory is used to design torque controller and flux controller these are applied to direct torque control (DTC) of induction motor. In the conventional DTC scheme, two PI controllers are used to generate the reference stator voltage vector. Then the parameters of PI controllers are stationary, therefore it can’t respond the dynamic performance. In order to improve the disadvantages of conventional DTC, this design of two fuzzy controllers (FC); Fuzzy torque controller (FTC) and fuzzy flux controller (FFC) are designed to substitute the original PI controllers, which improves the flux response and reduce the torque ripple for better system dynamic performance. The thesis also adopts cerebellar model articulation controller (CMAC) and fuzzy control theory with Gaussian as membership functions to design the adaptive fuzzy cerebellar model articulation controller (AFCMAC) speed controller. The mentioned AFCMAC has the advantages of simple structure and rapid learning ability. In addition, for the dynamic performance of motor is affected by stator resistance due to temperature effect, this research combines model reference adaptive system (MRAS) with fuzzy control theory to make the stator resistance fuzzy stator resistance estimator (FSRE) for real-time estimating and acquiring accurate flux linkage. Finally, this scheme integrated FTC, FFC, AFCMAC speed controller and FSRE to achieve the sensorless speed control for DTC of induction motor. Via the simuliaton and experimental results, the proposed direct torque control systems have excellent speed response and robustness within 36 rpm to 2000 rpm and 8 Nm load torque.
Chen, Ming-Liang, and 陳銘良. "The Sensorless Direct Torque Control System for Induction Motor." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/24995805262217816522.
Full text國立高雄應用科技大學
電機工程系碩士班
94
In this thesis, we researched the sensor-less direct torque control system applied to an induction motor servo system, using the induction motor stationary d-q axis model to deduce the rotor speed. Because the sensor-less direct torque control system needed accurate motor parameters, we proposed an automatic parameter measuring technique. To analyze and verify the control rules, We used the Matlab/Simulink to design the sensor-less direct torque control system. In addition to the above, we realized the hardware configuration by the xPC-MC240 PCI I/O Card development servo controller, made by TeraSoft corporation. We described the connections among the xPC soft/hardware, MC240 PCI I/O Card and the inverter in detail. By the simulation and the experiment, we demonstrated the feasibility of the proposed sensor-less direct torque control.
Chen, Jian-Ho, and 陳建和. "Direct Torque Control of Inverter at Low Speed Range." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/07601917530696522347.
Full text國立臺北科技大學
機械整合技術研究所
87
The objective of this paper is to develop an induction motor drive based upon the techniques of direct torque control (DTC) and inverter control. Moreover, the compensation technique at low speed range for the developed induction motor drive is investigated. Simulation and experimental results are presented to confirm the theoretical development. In order to improve the performance at low speed range and the parameter accuracy of auto tuning of the induction motor drive, dead time compensation is realized using software. It has been shown that the induction motor drive with dead time compensation has very promising torque and speed response even at low speed range. Moreover, the well-known space vector modulation technique for inverter control is also incorporated into the newly developed DTC-based induction motor drive. Simulation results agree with the experimental results very well, confirming the theoretical analysis.
Yu-HsinTeng and 鄧育昕. "Implementation of Direct Torque Control on Synchronous Reluctance Motor." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9wh835.
Full text國立成功大學
電機工程學系
105
In this paper, the direct torque control on synchronous reluctance motor and the flux Luenberger observer scheme are proposed to avoid the error accumulation and the stator voltage-drop caused by the back electromotive force integral in the traditional flux estimation. Three simulation software, i.e., Maxwell, Simplorer and MATLAB were used to implement the multi-physics coupled-simulation for designing the model of the synchronous reluctance motor direct torque control. MATLAB simulation was used to build the direct torque control model for determining the switching signal of the motor drive system, which was then delivered to the driver circuit built by Simplorer software. After which, Simplorer software exported the electric information such as current and voltage values to the synchronous reluctance motor model developed by Maxwell software for simulating the characteristics of the motor. Finally, the information collected was further delivered to MATLAB as the feedback signal to achieve the goal of multi-physics coupled-simulation. Our experimental results showed that the accuracy of the proposed method was higher than the traditional flux linkage estimation method. In addition, the co-simulation results of DTC collected had further confirmed that the capability/performance of the proposed method was better than the conventional method as well.
Chung-YouChang and 張崇侑. "Magnetic Flux Command Setting Strategy of Direct Torque Control." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/8sz3rq.
Full textWen, Ya-Ting, and 溫雅婷. "Drive IC Design of Direct Torque Control Induction Motor." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/b4mcda.
Full text國立臺北科技大學
電機工程系研究所
97
The focus of this paper is the driver IC design of direct torque control (DTC) induction motor, and uses the hardware description language (Verilog) is composed of hardware architecture. The cell-based digital IC design flow is used to design this control IC. The main principle of the direct torque control architecture is controlled magnetism and torque of the stator. It could select suitable for switch sequence of the inverter to induce a fast response of the induction motor after calculating the module. First, the rotor speed obtains the value by speed controller module, and use of switching state to get the three-phase voltage and the three-phase current. Those transforms into the d-q static axis by abc-dq transformation module, which used to compute the stator’s magnetism and torque. By comparing with original values, those magnetism and torque will be calculated and set to new datas. The switching table and the hysteresis controller are decided with the new data and generated a voltage vector and to control the stator magnetism and torque. The system function is programming with the hardware description language, and examining the functionality work. To Complete this IC design of direct torque control induction motor by TSMC 0.18μm cell library, and the EDA tools which vendors were Synopsys and Candence are employed for circuit implementation, which included circuit synthesis, auto place and routing and design verification for chip implementation. Completes this IC design of direct torque control induction motor.
Lin, Chun-Chih, and 林俊志. "Simulation and Analysis of Direct Torque Control Induction Motor." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/8kt35m.
Full text國立虎尾科技大學
電機工程研究所在職專班
99
Abstract VisSim, a visual language for modeling and simulating nonlinear dynamic system of Visual Solutions company, has been properly applied to imitate and analyze the rule of direct torque control(DTC) for three-phase induction motor in this thesis. The structures of the DTC have been explained in this thesis, including voltage space vector modulation, hysteresis comparator, voltage vector switching table, the rule of flux estimating . Besides imitating the rule of DTC system characteristic in this thesis, and compared with the field orietnd control(FOC)system, including the respond of three-phase induction motor rotational speed, torque, flux. Secondly study of the discussion to the motor resistance parameters. In case of not influencing most motors normal running, the stator resistance parameter can be omitted for the rule of flux estimating. It is simpler to make the rule of DTC, and is totally free of motor parameters.