The proposed scheme possesses some attractive features when compared to the conventional current. The classical switching table based dtc presents large flux, torque ripples and more mechanical vibrations in the motor. Direct torque control of permanent magnet synchronous motor is widely used in high performance servo applications due to. The direct torque control theory has achieved great success in the control of induction motors. Controller design for synchronous reluctance motor drive. This paper describes an investigation of direct torque control dtc for permanent magnet synchronous motor pmsm drives. Comparative study on direct torque control of interior. The basic differences to the control principles of other ac motors are due to the magnetic properties of permanent magnets, and particularly to the fact that the permanent magnet material is a part of the magnetic circuit of the machine, and therefore has a significant influence on its reluctance. Direct torque control of permanent magnet synchronous motor abstract. The use of permanent magnet synchrono us motors pmsms combined with the direct torque control dtc scheme offers many opportunities to achieve this goal.
This paper introduces the modeling of the direct torque control dtc system of permanent magnet synchronous motor based on matlabsimulink. Fault tolerant direct torque control of threephase. Highperformance motor control is characterized by smooth rotation over the entire speed range of the motor, full torque control at. Direct torque control of double star permanent magnet synchronous. Joshi published 2012 abstract due to the features such as high efficiency and high power density permanent magnet. Using this technique for synchronous motors with permanent magnets o. Project report on direct torque control of permanent magnet synchronous motor as without his constant motivation and support during my work, this would not have been possible.
Permanent magnet synchronous motors pms are typically used for highperformance and highefficiency motor drives. A highperformance direct torque control based on dsp in permanent magnet synchronous motor drive. Widespeed operation of direct torquecontrolled interior. Direct torque control based three level inverterfed double. Vector control of permanent magnet synchronous motor based on. Analysis of direct torque control in permanent magnet. In order to provide a more reliable and cost saving approach, the sensorless direct torque control of permanent magnet synchronous motor technique is proposed to eliminate the need of using encoders or resolvers. Direct torque control dtc of ac drives is considered one of the most interesting high performance control techniques nowadays. Fuzzylogicbased direct torque control research on permanent. Electrical engineering department technical college of basrah foundation of technical education, basrah iraq. Direct torque control of a permanent magnet synchronous motor.
Pilike fuzzy logic direct torque control of permanent magnet synchronous motor alaa a. Direct torque control system and sensorless technique of. In the conventional direct torque control dtc of a permanent magnet synchronous motor pmsm, hysteresis controllers are used to choose the proper voltage vector resulting in large torque. Index termsdirect torque control, matlabsimulink, permanent magnet synchronous motor drive, motor control. A permanent magnet motor is a direct current motor in which the field excitation is supplied by permanent magnets. The study is done by simulation using the simulink power system. Permanent magnet synchronous motors pmsm are widely used. Direct torque control dtc is a method to control motor with utilizing torque and flux. Direct torque control of multiphase permanent magnet synchronous motor drive. The direct torque control dtc technique of a permanent magnet synchronous motor pmsm has received increasing attention due to its simplicity and robust dynamic response compared with other control techniques. Traditionally, vector control with proportionalintegral loops vc shown in fig. Direct torque control of permanent magnet synchronous motor. Direct torque control of permanent magnet synchronous motors. Thus, the machine windings can be substituted by an equivalent scheme in the.
Aiming to solve the problem of large torque ripple in traditional dtc system, this paper introduces the principle of space vector modulation and builds the electric propulsion system models based on direct torque control for permanent magnet synchronous motor in simulink. Improved direct torque control of permanent magnet synchronous motor in electric vehicle drive. Introduction global warming and uncertainty on energy price demand efficient machine for industry applications. Deadbeat direct torque control of permanent magnet. But the torque and current ripples are occurred in the conventional dtc. Study on the direct torque control of permanent magnet synchronous. The main difference between a permanent magnet synchronous motor and an asynchronous motor is the rotor. Permanent magnet motor an overview sciencedirect topics. In pmsm drives, the electro magnetic torque is usually controlled indirectly via the stator current components in a reference frame fixed to the rotor flux field. By this method it is preserved the principle of the conventional dtc regarding the decoupled torque and flux control, while. Pdf the modeling and simulation of a permanent magnet. X problems associated with the direct torque control of an interior permanent magnet synchronous motor drive and their remedies. Performance enhancement of direct torquecontrolled.
Direct torque control of permanentmagnet synchronous. Pdf modified direct torque control of permanent magnet. I truly appreciate and value his esteemed guidance and encouragement from the beginning to the end of this report. Nonlinear adaptive speed control of a permanent magnet. Direct torque control dtc is a method to control machine with utilizing torque and flux of motor controlled. Standard handbook of petroleum and natural gas engineering third edition, 2016. Currentindependent torque control of permanentmagnet. This paper presents a comparative study on two most popular control strategies for permanent magnet synchronous motor pmsm drives. Velocity control of a permanent magnet brushed direct current motor an electric motor is a device that is often employed to provide motion to mechanical systems. The dtc scheme has already been successfully realized in induction motor 1m drives, and is being applied in permanent magnet synchronous motor pmsm variable speed drives 14. Direct torque control dtc is one method used in variable frequency drives to control the torque and thus finally the speed of threephase ac electric motors. In recent years many studies have been developedto find out different solutions for the pmsm drive control having the. Modified direct torque control of permanent magnet.
Comparison of fieldoriented control and direct torque. Pdf on may 4, 2016, shady m sadek and others published direct torque control of permanent magnet synchronous motors find, read and. This involves calculating an estimate of the motor s magnetic flux and torque based on the measured voltage and current of the motor. First of all, the classical direct torque control of permanent magnet synchronous motor pmsm with sinusoidal backemf is discussed in detail. A low torque ripple direct torque control method for. This paper proposes a method of applying the space vector modulation technique for direct torque control dtc of a permanent magnet synchronous motor pmsm drive. Direct torque control dtc of ac drives is considered one of the most interesting high dynamic response motor control strategies nowadays. The model of threephase permanent magnet synchronous motor pmsm with loss of one phase or loss of one transistor is built and its fault tolerant direct torque control dtc is investigated. Direct torque control of a permanent magnet synchronous motor drives using space ector modulation. These motors require a variablefrequency power source to start. Because of the constant magnetic field in the rotor these cannot use induction windings for starting. This paper presents a new control scheme for wide speed range operation of interior permanent magnet synchronous motor drives, where both torque and stator flux linkage are directly controlled.
Pdf direct torque control of a pmsmdrive for electric vehicle. Extraleg extraswitch inverter is put to use in the postfault operation. Permanent magnet synchronous motor drives pmsm offers many. This paper proposes a simple method to generate stable voltage commands for permanent magnet synchronous motors to achieve low torque ripple based on space vector modulation direct torque control svmdtc. Niu et al comparative evaluation of direct torque control strategies for permanent magnet synchronous 1409 systemforsvmhasbeenproposedin22. Recently several authors have proposed possible implementations of direct torque control for permanent magnet synchronous motors. Direct torque control of permanent magnet synchronous motor pmsman approach by using space vector modulation svm. A novel sensorless direct torque control technique of. This type of control is known as direct torque control. Joshi, abstract due to the features such as high efficiency and high power density permanent magnet synchronous motors pmsm are becoming attractive. Instead of measuring currents, all required control parameters are. The process of the building simulation system is discussed in detail. Chapter 10 velocity control of a permanent magnet brushed. Dtc, pmsm, hysteresis and nonhysteresis controllers, switching tables.
The experimental results carried on a dspace platform with a laboratory prototype of the permanent magnet machine verify that the proposed dutybased dtc method can achieve excellent transient response, less torque ripple, and less steadystate error, without resorting to the complicated control method over a wide range of operating regions. Permanent magnet synchronous motors pmsm are now replacing induction motors im in a variety of applications due to. A permanent magnet synchronous motor and reluctance motor requires a control system for operating vfd or servo drive. Under the dl coordinate system, the torque and flux controller is designed. Secondly, the proposed twophase conduction mode for dtc of bldc motors is introduced in the constant torque region. Moghaddam, ari tammi, larserik thand electric motors in industrial applications account for approximately 60 65 percent of consumed industrial electricity. First of all, the classical direct torque control of permanent magnet synchronous motor pmsm with sinusoidal backemf is. This involves calculating an estimate of the motors magnetic flux and torque based on the measured voltage and current of the motor.
Pdf improved direct torque control of permanent magnet. The direct current may be supplied from a separate dc source or from a dc generator directly connected to the motor shaft. Permanent magnet synchronous motor drives pmsm offers many advantages over the induction motor, such as overall officiency, effective use of reluctance torque, smaller losses and compact motor size. Controller design for synchronous reluctance motor drive systems with direct torque control 255 generates noise, and requires space. Pdf dsp based direct torque control of permanent magnet.
In order to solve the problem of large torque and flux ripple in the traditional direct torque control of permanent magnet synchronous motor, supertwisting sliding mode variable structure control strategy is adopted. It is mathematically proven that the increase of electromagnetic torque in a permanent magnet motor is proportional to the increase of the angle between the stator and rotor flux linkages, and, therefore, the fast torque response can be obtained by adjusting the. Pdf direct torque control of permanent magnet synchronous. Permanent magnet synchronous motors pmsms are attractive and competitive in ac drive applications due to its selfexcitation, high efficiency, high torque toinertia and fast dynamic response elmas and ustun, 2008, khanchoul et al. Direct torque control of permanent magnet synchronous motors dtcpmsm by eng. Control of permanent magnet synchronous motors request pdf. In high performance servo applications a rapid and accurate torque control is desired preferably without the use of. Synchronous motors controlled by variablespeed drives are.
Mpcbased torque control of permanent magnet synchronous. An alternative scheme to reduce torque ripple and mechanical. Direct torque control of permanent magnet synchronous motor zhang tao, liu baolian, zhang huiping faculty of electronic and electrical engineering, huaiyin institute of technology, huaian223003, p,r. Permanentmagnet synchronous motor sensorless control. Traditionally, the rotor position and speed of rotation are directly fed back through encoders or resolvers. As the technology gets improved, studies on pmsm such as direct torque control method have been improved as well. Direct torque control for permanent magnet synchronous. The dynamic performances of the driving system can be analyzed in the simulated results presented at the end of this paper. Abstract this paper describes an investigation of direct torque control dtc for permanent magnet synchronous motor. Synchronous motors controlled by variablespeed drives are bringing higher efficiencies to industrial applications motoring ahead heinz lendenmann, reza r.
A very fast direct torque control for interior permanent magnet synchronous motors start up. The theoretical basis of the direct torque control dtc of permanent magnet synchronous motor pmsm drives is firstly explained in this paper. The direct torque control of a double star permanent magnet synchronous machine is based on the direct determination of the sequence control used to switch a voltage inverter. Two different flux estimators are employed in order to. Direct torque control of permanent magnet synchronous motor nitin kelkar, v. Direct torque control of permanent magnet synchronous motors core. Direct torque control of permanent magnet synchronous. As a result, the sensorless drive systems can reduce costs and improve reliability. Permanent magnet synchronous motors are similar to brushless dc motors.
To solve those problems associated with conventional direct torque control dtc of permanent magnet synchronous motor pmsm, such as high current, flux and torque ripple, variable switching. The doublelayer ipm rotor design is accounted for ipmsms requiring a wide torque speed envelope. In principle, vector control is required for controlling the pmsm. The comparison is based on various criteria including basic control characteristics, dynamic performance, and implementation complexity. Direct torque control dtc method for permanent magnet synchronous pms motor has attracted great deal of attentions thanks to its significant advantages including. Direct torque control for permanent magnet synchronous motors. This work presents the direct torque control dtc techniques, implemented in four and sixswitch inverter, for brushless dc bldc motors with nonsinusoidal backemf using two and threephase conduction modes. As technology improves, studies on permanent magnet synchronous motors have increased and became to major on field oriented control and direct torque control methods. Sensorless direct torque control of surfacemounted permanent magnet synchronous motors with nonlinear kalman filtering. Direct torque control of permanent magnet synchronous motors 1 depenbrock, 1988 presented the direct self control theory.
Simulation research of direct torque control for marine. The relationship between applied voltage and electromagnetic torque is first analyzed and the effect of the voltage and flux linkage on. Direct torque control of double star permanent magnet. Abstract this paper investigates the improvement of the speed and torque dynamic responses of three phase permanent magnet synchronous motor pmsm using direct torque control dtc technique. Direct torque control of permanent magnet synchronous motor pmsm an approach by using space vector modulation svm. Speed control of permanent magnet synchronous motor based. Abstractin this paper, an integrated design and direct torque control dtc of inverterfed interior permanentmagnet synchronous motors ipmsms for widespeed operation with high torque capability is presented. Permanent magnet synchronous motor has the characteristics of small size, lightweight, high power factor and high efficiency, and is widely used in the field of robots and electric vehicles 1. Keywordsclarke transformation, mathematical model of permanent magnet synchronous motor, park transformation, sinusoidal pulse width modulation, vector control. The main topics of permanent magnet motor control are mathematical modelling, voltage feed inverter model, space vector modulation and determination of voltage vectors. Switchingtable and space vector modulation direct torque. This choice is usually based on use of hysteresis comparators whose function is to control the system state, namely the amplitude of stator flux and electromagnetic torque. Direct torque control dtc is a method to control machine with utilizing torque and flux of motor. Modified direct torque control of permanent magnet synchronous.
In wind mill generators, the development has currently been in the direction of permanent magnet machines. Several researchers have studied the rotor estimating technique to realize a sensorless drive. A currentindependent torque equation for the permanent magnet synchronous motor pmsm aiming at direct drive servo applications is derived from a first principles model. Pdf this paper proposes the use of a permanent magnet synchronous motor pmsm as a propulsion system of an electric vehicle ev. The existing literature have proposed some methods to reduce torque and flux. This work combines these techniques and it proposes the use of pulse width modulation by means of diverse fuzzy logic strategies to re duce the ripple and to improve flux and torque response. In dtc conspire avrc, the need for speed torque sensors may likewise be disposed of. In conventional direct torque controlled dtc permanent magnet synchronous motor drive, there is usually undesired torque and flux ripple. Electrical engineering department college of engineering university of basrah, basrah iraq. Direct torque control of permanent magnet synchronous motor pankaj zodape research scholar, electrical department, jabalpur engineering, college jec, jabalpur, india abstract.
Adaptive vector control reference strategy based speed and. Pilike fuzzy logic direct torque control of permanent. Comparative studies on several direct torque control dtc strategies of interior permanent magnet synchronous motor ipmsm for electric vehicles evs are discussed in details, namely basic dtc, dtc combined with space vector modulation dtcsvm, and. According to this theory, the variations in operation frequency are obtained by the algebraic calculations from the heylandossanna circular diagram based on the torque demand feedback. However, in the dtc drive system of permanent magnet synchronous machine pmsm proposed a few years ago, there are many basic theoretical problems that must be clarified. Jul 31, 2010 direct torque control of permanent magnet synchronous motor abstract. Highperformance motor control is characterized by smooth rotation over the entire speed range of the motor, full torque control at zero speed, and fast acceleration and deceleration. Control of permanent magnet synchronous motors is a timely advancement along that path as the first comprehensive, selfcontained, and thoroughly uptodate book devoted solely to the control.
In order to effectively achieve torque demand in electric vehicles evs, this paper presents a torque control strategy based on model predictive control mpc for permanent magnet synchronous motor pmsm driven by a twolevel threephase inverter. A direct torquecontrolled interior permanent magnet. Given the close relationship between torque and torque angle, proper. Permanent magnet synchronous motors pmsm, characterized by high power density and efficiency, domain most of the applications that require high performance in control of position, speed, and torque. Index terms direct torque control, matlabsimulink, permanent magnet synchronous motor drive, motor control. Introduction compared with other forms of motor, permanent magnet synchronous motor pmsm has better dynamic performance, smaller size and higher efficiency. During a long time, permanent magnet synchronous motor pmsm were only reserved for some specific applications, however, recently, these machines are becoming more used due to the powerful magnetic characteristic of the rare earth, being used in. A centralized control strategy is established in the mpc framework to track the torque demand and reduce. The permanent magnet synchronous motors are more and more popular in marine electric propulsion field. In this paper the effect of the voltage vector on the amplitude of stator flux, torque angle and torque of the permanent magnet synchronous motor pmsm direct torque control dtc drive. A modified direct torque control dtc method based on torque angle is proposed for interior permanent magnet synchronous motor ipmsm drivers used in electric vehicles evs.
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