Design Optimization And Performance Analysis Of Permanent Magnet Synchronous Motor For Electric Vehicles

Due to focused on the new energy vehicle "Three Horizontal and Three Vertical" and pure electrical vehicle technical route being carried out,which Proposed by the national science and technology department,China’s new energy vehicle technology and foreign auto technology gap gradually narrowed.In the internal pure electric vehicle field,compared with other electric excitation motor,permanent magnet synchronous drive motor as pure electric vehicle mechanical and electrical energy conversion`s core components,with its high torque / power density,wide efficient distribution and weak magnetic Speed range,caught most car manufacturers and research institutions favored.Therefore,it is of great significance to study the permanent magnet synchronous drive motor.In this paper,an drive motor with the rated power of 30 KW and the peak speed of 9000 rpm was designed from the design of the permanent magnet synchronous drive motor and the pure electric vehicle motor control.This paper first analyzes the performance requirements of the pure electric vehicle under the different driving conditions in the city road,and calculates the basic performance parameters of the driving motor by referring to the vehicle parameters of the matching vehicle.According to the design requirements,the rotor magnetic circuit structure of the permanent magnet synchronous drive motor for pure electric vehicle is determined.The main dimension parameters and electromagnetic parameters of the driving motor are designed and calculated by the design concept of field circuit.Then,the finite element simulation software Maxwell’s routing module is used to optimize the design initial value,and the structural dimensions and electromagnetic performance parameters of the final designed motor are obtained.Secondly,the finite element simulation software Maxwell is used to analyze the harmonic content of the air gap air gap and the back electromotive force of two different rotor magnetic circuit motors in the transient field.The cogging torque of the two motors is analyzed by comparing the different troughs,the stator slot width and the rotor section oblique pole.And then for the built-in "V"_type rotor magnetic circuit structure for multi-objective optimization,to reduce the cogging torque peak.The vector control strategy of the permanent magnet synchronous drive motor in different operating regions is analyzed.The IPMSM control system of the maximum torque / current(MTPA)control strategy is set up in the MATLAB / Simulink simulation platform.The driving motor Dynamic response characteristics of no load and load start.Then,the distribution of the motor loss during the start-up process and the full-speed range is analyzed emphatically,and the efficiency distribution curve and cloud map are obtained in the full speed range of the motor.Finally,a prototype of "V"_type permanent magnet synchronous drive motor is designed and the parameters of no-load back electromotive force,external characteristics,efficiency distribution and temperature rise are tested.Test results show that the design of the prototype to meet the basic needs of pure electric vehicles.