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Dissertations / Theses on the topic 'Direct Torque Control'

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Published: 4 June 2021
Last updated: 9 March 2023

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1

Magalhães, 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.

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Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Mestre em Engenharia Electrotécnica e de Computadores
Este 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
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2

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.

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3

Alam, S. M. Mahfuz. "Direct Torque Control of AC Machine Drives." Thesis, Southern Illinois University at Edwardsville, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10128872.

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Field 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.

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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.

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This thesis is mainly devoted to the investigation of speed control methods of three phase, cage rotor induction motors with particular emphasis being given to vector control and direct torque control techniques. Modern control strategies such as vector control and direct torque control are investigated as well as the conventional methods such as open loop (constant V/f) operation. A number of different pulse width modulation (p.w.m.) waveform generation strategies are simulated and discussed and their application to the above speed control systems fully investigated. A 3kW, three phase induction motor drive has been designed and experimental data obtained from it in order to verify the results achieved by simulation. It is shown that direct torque control achieves decoupling of the motor torque and the motor flux without the use of a co-ordinate transform. A variation of the direct torque control algorithm has also been developed and implemented. It is shown, that by using different switching tables for the selection of voltage vectors, the performance of direct torque control can be further improved. Further insight into the nature of direct torque control has been gained from the study of the effect of the application of inverter switch settings, or the application of corresponding voltage vectors, on the motor flux and torque. It has been found that the range of torque variation of the motor drive system depends strongly on both the motor load torque and the motor speed. The results of the work reported indicate that the range of torque variation for a drive system which strongly depends on motor load torque and motor speed is considerably reduced by the novel direct torque control system resulting from the research. The control algorithms have been implemented on 32 bit micro processors which facilitate the use of parallelism in both the hardware and the software design. The resulting system is capable of controlling a three phase induction motor with variable voltage and variable frequency with control strategies such as six step operation, symmetric and asymmetric regular and natural sampled p.w.m. waveforms, sigma delta modulation methods, space vector modulation techniques, flux vector control and direct torque control.
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5

Arias, Pujol Antoni. "Improvements in direct torque control of induction motors." Doctoral thesis, Universitat Politècnica de Catalunya, 2001. http://hdl.handle.net/10803/6317.

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This thesis is mainly devoted to the investigation of speed control methods for three phase cage induction motors with particular emphasis being given to Direct Torque Control (DTC) improved techniques.
Classical 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.
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del, Toro García 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.

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7

Okumus, 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.

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8

Tsoutsas, 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.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2009.
Thesis 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.
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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.

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Dissertação para obtenção do Grau de Mestre em Engenharia Electrotécnica e de Computadores
Multi-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.
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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.

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This work presents an improved variant of the Direct Torque Control (DTC) for a Permanent Magnet Synchronous Motor (PMSM). The improved DTC use a higher number of voltage space vectors by introducing a kind of Space Vector Modulation technique. The higher number of space vectors are tabulated in more precise switch tables which also take the emf induced in the stator windings into account. The emf voltage significantly affect the motor behavior from a given space vector. It is discussed how the switch tables are constructed. Experiments from the classical and improved DTC are compared and show that the torque, flux linkage and stator current ripples are significantly decreased with the improved DTC.
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11

Yu, Jian. "Direct torque control of brushless doubly-fed reluctance machines." Thesis, Northumbria University, 2004. http://nrl.northumbria.ac.uk/897/.

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Theoretical and Experimental results of research on the Direct Torque Control (DTC) of the Brushless Doubly Fed Reluctance Machine (BDFRM) are presented in this thesis. The main motivation for this work has been found in the relative simplicity of the DTC strategy and attractive properties of the BDFRM drive, foremost its cost-effectiveness associated with the use of a partially rated power electronics, and reliability of brushless structure of the machine itself. It is hoped that the project outcomes will be extremely helpful to the further study of the machine in light of its application in wind power generation and/or large pump systems. The thesis is essentially divided into three main parts. The first part is the theory development, which involves the analysis of the fundamental principles of DTC and BDFRM operation. The second part presents the comprehensive simulation studies of the developed control scheme for the machine in both sensor and sensorless modes. The computer studies have been performed to examine the performance of the controller based on a linear (ideal) machine model. The parameters used for this model have been obtained by off-line testing of a small Axially Laminated BDFRM prototype at Northumbria University, UK. The third part of the thesis contains a comprehensive set of experimental results that have successfully verified the control algorithm for the machine. Based on the Simulink® program, a Digital Signal Processor (DSP) control board from dSPACE® has been used to control a conventional IGBT inverter bridge.
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12

Abdollahzadeh, 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.

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Electric drives for induction machines are of great importance because of the popularity of this machine type. To design, simulate and implement such drives, fast, reliable digital signal processors are needed. Recently Field Programmable Gate Array (FPGA) has been used in electric drive applications. This is mostly because of higher flexibility of hardware solutions compared to software solutions. In this thesis, FPGA-based simulation and implementation of direct torque control (DTC) of induction motors are studied. DTC is simulated on an FPGA as well as a personal computer. Results prove the FPGA-based simulation to be 12 times faster. Also an experimental setup of DTC is implemented using both FPGA and dSPACE. The FPGA-based design provides a potential sampling frequency of 800 kHz. This is a breakthrough knowing that a low ripple DTC is highly dependent on high sampling frequencies. Finally, a configurable torque/speed control system is designed and implemented on dSPACE.
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Liu, 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.

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14

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.

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15

Li, Yaohua [Verfasser]. "Direct Torque Control of Permanent Magnet Synchronous Machine / Yaohua Li." Aachen : Shaker, 2010. http://d-nb.info/1081886862/34.

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16

Pham-Dinh, Truc. "Direct torque control of induction machines considering the iron losses." Thesis, Liverpool John Moores University, 2003. http://researchonline.ljmu.ac.uk/4969/.

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17

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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18

Dever, 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.

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19

Ortega, 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.

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La demanda d’aplicacions industrials avançades, fa que el control de màquines elèctriques de corrent altern (AC) sigui una disciplina contínuament creixent per satisfer l’alt nivell d’exigència. Tradicionalment, la màquina d’inducció (IM) ha estat la més utilitzada en aplicacions industrials de velocitat variable, incloent-ne bombes i ventiladors, màquines tèxtils i de paper, vehicles elèctrics, generació eòlica, etc. A més dels requeriments funcionals, l’estalvi energètic és, actualment, un aspecte a tenir en compte en aplicacions de velocitat variable. Una alternativa molt atractiva a la IM és la màquina síncrona d’imants permanents (PMSM). Entre d’altres avantatges, aquest tipus de màquines ofereixen una eficiència més elevada, alta densitat de potència i una resposta dinàmica molt ràpida. La demanda industrial de PMSM es situa en el rang de petita potència, encara que el interès en aquest tipus de màquines està creixent, en particular fins al rang dels 100 kW. Històricament, les màquines utilitzades en aplicacions de velocitat variable han estat alimentades per inversors de potència. En els últims anys, el convertidor matricial ha esdevingut un clar competidor del inversor convencional. Un convertidor matricial és un circuit de topologia avançada capaç de convertir directament AC en AC generant una tensió de càrrega amb amplitud i freqüència variable, amb flux de potència bidireccional, formes d’ona sinusoïdal tant a l’entrada com a la sortida i operant amb factor de potència unitari a l’entrada. A més, degut a que requereix no elements inductius ni capacitius per emmagatzemar energia, el disseny del convertidor matricial és molt compacte. Existeixen molts tipus de control per màquines de AC, essent els basats en control vectorial els més adequats per aplicacions de d’alt rendiment. Entre d’altres, el control de camp orientat i el control directe de parell son els més utilitzats. Tot i essent una de les tècniques emergents en aplicacions industrials, el control directe de parell té implícites una sèrie de limitacions que, encara avui, s’estan investigant. El treball presentat en aquesta tesi, s’endinsa en la investigació del control directe de parell per PMSM alimentats amb convertidors matricials. Aquest, treball considera el reemplaçament del inversor convencional per un convertidor matricial, explotant les característiques d’aquest per tal de reduir el arrissat del parell i del flux en la PMSM, inherent al control directe de parell. Durant el transcurs d’aquest treball s’ha desenvolupat un nou control directe de parell utilitzant vectors curts i llargs del convertidor matricial. Els efectes indesitjats de la tensió en mode comú, relacionada amb la utilització de convertidors de potència, és altre dels aspectes que s’aborden en aquest treball. Un algoritme molt simple que redueix la tensió en mode comú ocasionat pel control directe de parell amb convertidors matricials ha estat desenvolupat i investigat en aquesta tesi. La principal limitació de les tècniques “sensorless” basades en models o observadors és que fallen a baixes velocitats. La necessitat d’operar a baixa velocitat o velocitat zero, ha desencadenat la investigació d’altres tècniques on s’exploren les asimetries de la màquina a partir de la injecció d’un senyal d’alta freqüència per obtenir-ne la posició del rotor. Durant aquesta tesi s’ha desenvolupat un nou algoritme de injecció d’un vector rotatori en el pla  quan s’utilitza el control directe de parell.
The 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.
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20

Abosh, Atheer. "Direct and indirect torque control of unbalanced permanent magnet synchronous machines." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/15245/.

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Electrical machines may exhibit various types of imbalances and undesirable harmonic distortions. These may increase the torque and flux ripples, acoustic noise, unbalanced three-phase currents, while also reducing efficiency. These types of imbalances and undesirable harmonic distortions cannot be controlled by using the conventional indirect torque control (ITC) and direct torque control (DTC) strategies. For some high-performance motion control, such as precision machine tools, robotics, and servo drives, low torque ripples are, however, obligatory. Nowadays, more studies have been conducted on the ITC strategy to control undesired current harmonics, such as double synchronic reference frames (DSRF), resonant controller, second order generalized integration, and reference current generation. Such strategies, however, can rarely be applied to DTC strategy. In this research, the influence of asymmetric winding impedances, unbalanced back-EMF, and inverter nonlinearity in three-phase surface-mounted PMSMs has been systematically investigated by employing space vector modulations (SVM) based ITC and DTC strategies. This thesis firstly presents a modified ITC strategy by extracting the positive and negative sequence components in the stationary abc frame, and then a coordination transformation is used to control the machine in DSRF. This strategy provides faster dynamic response when compared with the conventional DSRF strategy, since the filters and the decoupling network are not required. Due to the lack of research regarding the DTC strategy under unbalanced conditions, this research investigates and proposes modified cascaded and parallel DTC-SVM strategies. The conventional cascaded DTC strategy is investigated under balanced and unbalanced conditions. Then, a modified control strategy is introduced by adding two compensators (the conventional PI-controller with a resonant controller, and the use of the negative- and positive-sequence voltage vectors) to suppress the 2nd harmonic components in the torque and stator flux linkage. Furthermore, for parallel DTC-SVM, the compensation of the 2nd and 6th harmonic components is investigated by means of either a resonant controller or an adaptive filter. In addition to the simplicity of the proposed strategies, these may also be able to significantly reduce the torque and flux ripples, while maintaining the merit of the fast dynamic response of the conventional DTC strategy even under variable fundamental frequency. Moreover, it has been proven that the compensation from using a resonant controller or an adaptive filter is parameter independent. Thus, regardless of unbalanced conditions, an effective torque ripple minimisation can still be achieved by properly selecting the dominant harmonic compensation.
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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.

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22

Zhao, 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.

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Ren, Yuan. "Direct torque control of dual three-phase permanent magnet synchronous machine drives." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/12190/.

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Gullayanon, Rutchanee. "Motion Control of 3 Degree-Of-Freedom Direct-Drive Robot." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6969.

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Modern motion controllers of robot manipulators require knowledge of the system's dynamics in order to intelligently predict the torque command. The main objective for this thesis is to apply various motion controllers on a parallel direct drive robot in simulations and verify if one can take advantage of the model knowledge to improve performance of controllers. The controllers used in this thesis varied from simple PD control with position and velocity reference only applied independently at each joint to more advanced PD control with full dynamic feedforward term and computed torque control, which incorporate full dynamic knowledge of the manipulator. In the first part, a thorough study of deriving dynamic equation using Lagrange formulation has been presented as well as the actual derivation of dynamic equations for MINGUS2000. Next, in order to prepare proper sets of inputs for the simulations, detailed discussions of end effector trajectory path planning and inverse kinematics determination have been presented. Finally, background theories of various controllers used in this thesis have been presented and their simulation results on the closed-chain direct drive robot have been compared for verification purposes.
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Ozturk, 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.

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Andrews, 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.

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Approved for public release; distribution is unlimited.
The 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.
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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.

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28

Park, 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.

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The 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.

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Xu, Xingsheng. "MIMO Direct Adaptive Torque Control for Workspace Task of Hyper-redundant Robotic Arm." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1589474272081458.

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Yun-ChungWeng and 翁允中. "Low Torque Ripple Direct Torque Control for IPM Motor." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/m4fpaq.

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史宗岳. "Implementation of Direct Torque Control Inverter." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/02277787858573295118.

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碩士
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.
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32

Yang, Wei-Chang, and 楊偉昌. "Design of the Direct Torque Control IC." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/90637893026079273341.

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碩士
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.
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33

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.

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碩士
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.
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34

"Improvements in direct torque control of induction motors." Universitat Politècnica de Catalunya, 2001. http://www.tesisenxarxa.net/TDX-0724101-144636/.

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35

Brassfield, William R. "Direct torque control for brushless doubly-fed machines." Thesis, 1993. http://hdl.handle.net/1957/36482.

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The Brushless Doubly-Fed Machine (BDFM) has recently become an important research topic in the field of variable-speed AC drives. In recent studies, the BDFM has shown significant potential for improving the reliability and performance of AC drive systems, as well as reducing total system cost. While the BDFM offers several advantages over existing AC drives in steady-state operation, it suffers from dynamic instabilities and slow response times, and a feedback control system is necessary. The mathematics of the BDFM are much more complicated than those of a singly-fed machine, and thus traditional control methods can't be applied. In this thesis, a control method known as "Direct Torque Control" has been adapted from that of a singly-fed induction machine and successfully applied to the BDFM. The thesis begins by discussing the background of the BDFM, its open-loop operating characteristics, and some of the control considerations. The reduced-order system differential equations are introduced, and it is noted that they are coupled and nonlinear. Furthermore, all state variables are time-varying (but periodic), even in steady-state operation. In the controller development, it is found that a linear relationship exists between the desired torque/flux-level change and the d-q voltages to be applied to the control winding of the machine via the power-electronic converter. This linear relationship, together with a one-step-ahead predictor to compensate for computational delay, is successfully used to control the speed and efficiency of the machine, for a wide range of speeds and load torques. Numerous open- vs. closed-loop simulations are compared and summarized, and it is found that the performance of the BDFM is greatly improved in the closed-loop, with faster response and reduced oscillation. Further simulations investigating the robustness of the controller are summarized, and it is found that the controller is reasonably insensitive to errors in most of the the static machine parameters. Hardware implementation is briefly discussed but is not complete; laboratory results are not yet available but should be soon. Future controller considerations are then discussed; included among the recommendations are an on-line parameter estimator for use in adaptive control, and a controller for generator applications of the BDFM.
Graduation date: 1993
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36

Pan, Yi-Cheng, and 潘奕丞. "Hybrid Direct Torque Control for Induction Motor Drives." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/61568632171644115675.

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Abstract:
碩士
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.
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37

Chang, Wen-Sheng, and 張文勝. "Direct Torque Control of Permanent Magnet Synchronous Motor." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/29202449038718233363.

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碩士
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.
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38

Chu, Bor-Sen, and 褚柏森. "Application of Induction Motor to Direct Torque Control." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/01311922385082708578.

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碩士
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.
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39

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.

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碩士
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.
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40

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.

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碩士
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.
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41

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.

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碩士
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.
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42

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.

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碩士
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.
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43

Chang, Chi-Ming, and 張志明. "The Microprocessor Based Direct Torque Control of Induction Motor." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/05318687401786441854.

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碩士
國立臺灣大學
電機工程學系
86
A 80196MC micro-controller based direct torque controlsystem of inductio n motor is implemented in this thesis. Thedirect torque control and the speed adaptive observer are combined in this system to achieve speed control. Wi th direct torque control, this system features simple structure, brief computa tion and better dynamic response. The adaptive observer eliminates the use of a speed sensorby estimating the rotor speed from stator current and stator vol tage signal. To improve the performance of this system, twotechniques of elevating the switching frequency are proposed: the novel regulation scheme a nd the carrier injection method. The novel regulation scheme can increase the switching frequency by switching twice in one sampling period, and a 5-order h ystersis comparator is utilized to achieve better torque control. The carrier injection method has the benefits of elevating switching frequency and less sw itching noise. Both simulation and experiment results show the validity an d effectiveness of the proposed control scheme.
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44

Kau, Chien-Long, and 高建隆. "Direct Torque Control of PMSM with Feedback-Linearization Techniques." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/49377734361850915674.

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Abstract:
碩士
國立交通大學
電機與控制工程系
88
Direct Torque Control is to use torque and flux magnitude as input commands in the controller,which calculates the voltage vector for the motor. In this thesis, feedback-linearization theory is applied and the robustness is considered in designing the direct torque control law of PMSM.This control scheme can avoid the disturbance from any unpredicted condition, and will still keep the system stable. Besides, adaptive MRAC law will be also applied in speed tracking control. Since control scheme can immidiately estimate the mechanical parameters of the motor and the extra unknown load, the exact machanical parameters are not necessarity known. The proof of stability and the experiment results are presented in this paper. The simulations and experiments of the control structure will be implemented by C language with PC-based hardware. The results of simulations and experiments will verify the validity and practice of this technique.
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45

Su, Hung-Yen, and 蘇鴻彥. "Developments of Digital IPs for Direct Torque Control Platform." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/55390636655520677197.

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碩士
長庚大學
電機工程研究所
95
This thesis utilize the FPGA-Based Controller to realize a direct Torque Control (DTC) for Induction Motors. Describe with Verilog HDL that writes every mould group DTC，designing into ASIC structure, among them include FIFO , PCU , CCU , CU and FSM .Then verify the output waveform with Xilinx simulation，tests its function，and do logic optimization with Logic Synthesis, whether the Area , Power and Timing after reaching to need , reach the making of Soft IP; The SIP core of each component can be integrated in a single motor controller platform.The FPGA platform is constructed to verify the feasibility of the proposed control algorithm.
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46

Yu-HsinTeng and 鄧育昕. "Implementation of Direct Torque Control on Synchronous Reluctance Motor." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9wh835.

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碩士
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.
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47

Chung-YouChang and 張崇侑. "Magnetic Flux Command Setting Strategy of Direct Torque Control." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/8sz3rq.

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48

Wen, Ya-Ting, and 溫雅婷. "Drive IC Design of Direct Torque Control Induction Motor." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/b4mcda.

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碩士
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.
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49

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.

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碩士
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.
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50

Lin, Juu-kuh, and 林主庫. "Design and Implementation of Direct Torque Control for Induction Motor with Minimum Torque Ripple." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/62217514276006772109.

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博士
國立中央大學
電機工程研究所
100
The purpose of this dissertation is to investigate a novel direct torque control for induction motors. To theoretically analyze the torque ripple, a criterion for the torque ripple should be firstly defined. This dissertation aims to minimize the torque ripple criteria defined by the root mean square (RMS) over a sampling period. By minimizing the RMS torque ripple criteria, one could obtain the optimal switching time for zero and nonzero vectors. However, the optimal switching time is a function of the starting torque error between the reference and actual torques. This means this controlled optimal torque ripple is local but global because of the dependence of starting toque error. Three interesting problems are raised from this starting torque error based optimal torque ripple control. The first one is the evolution of the starting torque error based optimal torque ripple when time increases. The next problem is the existence of global optimal torque ripple, which should not be a function of the starting torque error. The last one is to design a control input such that the torque ripple is the global minimum. Aiming at three problems mentioned above, this dissertation firstly not only proves the existence but also finds the formula of the global minimum torque ripple. Then, starting from a local minimum torque ripple, this dissertation deeply investigates the evolution of the local minimum torque ripple as time increases. A very interesting fact has been found is the convergence from local to global minimum torque ripple when time goes to infinite. Moreover, because of the existence of global minimum torque ripple, this dissertation proposes a two-phase control to obtain the global minimum torque ripple. The first phase control drives the torque error to zero. Therefore, the second phase control enables the global minimum torque ripple. Finally both simulation and experimental results are provided to verify the feasibility of the new-type direct torque control for induction motor drive system.
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