Research On Control And Efficiency Optimization Of Permanent Magnet Synchronous Motor For Electric Vehicle

With the world’s oil shortage and environmental degradation.Developing new energy vehicles is the only way to realize sustainable development of automotive industry.Electric vehicles are among the best in new energy vehicles.This paper mainly studies the control and efficiency optimization of permanent magnet synchronous motor for electric vehicles.The research has a very important significance for the popularization of electric vehicles.At the first part of the paper,the mathematical model of the permanent magnet synchronous motor is established.We analyze the SVPWM control theory,the principles of coordinate transformation and decoupling control.The three main control methods which are Variable Voltage and Variable Frequency Control,Field Oriental Control and Direct Torque Control of permanent magnet synchronous motor are briefly introduced,their advantages and disadvantages are analyzed,and vector control is selected as the control method of this paper.Then,the strategy of vector control of permanent magnet synchronous motor is introduced in detail.The MATLAB/Simulink modeling is used to simulate the _di(28)0 control,speed loop PI output limitation,current loop error compensation control and reduced common-mode voltage technique with nonzero vector pulse width modulation.We analyze of the advantages and disadvantages of each algorithm and its application.Afterwards,the optimization of control efficiency of permanent magnet synchronous motor for electric vehicle is studied.The principle of maximum torque per ampere control is analyzed in detail,as well as its advantages and disadvantages.Two algorithms for maximum efficiency control of permanent magnet synchronous motor are proposed.One algorithm is to improve the maximum torque per ampere control,and the other one is based on the current vector offset control of_di(28)0.These two algorithms which do not depend on motor parameters are not affected by changes in motor parameters,and have strong robustness.Finally,an experimental study on the control algorithm and efficiency optimization of permanent magnet synchronous motor is carried out through the experimental platform based on TMS320F28069.The experimental results show that the proposed control algorithm improves the dynamic response and control efficiency of the system and can increase the maximum by 4%control efficiency of motor,to achieve high efficiency and fast response requirements.