Optimization Design Of Permanent Magnet Synchronous Motor For Electric Vehicles

As a core component of the electric vehicle drive system,the performance of the motor directly affects the operation of the electric vehicle.For the electric vehicle drive motor,it is necessary to meet the high torque output in the low speed zone,and at the same time to meet the special requirements of the high and constant power zone wide and weak magnetic speed regulation range,and study the influence of structural parameter changes on the motor weak magnetic speed regulation performance and torque.It is of great significance.This paper mainly discusses the design of permanent magnet synchronous motor for electric vehicle,and combines Taguchi method and time step finite element to optimize the design of permanent magnet synchronous motor for electric vehicle drive.Firstly,according to the relevant performance requirements of permanent magnet synchronous motor for electric vehicles,the design of permanent magnet synchronous motor with rated power of 30 kW is completed by analyzing the motor and analyzing the relevant dimensions of the motor and the matching of the pole slot.The preliminary design of the motor was simulated and analyzed by finite element software,and the torque performance and the cross-axis inductance of the motor were analyzed,which provided the direction for the next optimization design.Secondly,in order to improve the performance of the weak magnetic speed regulation of the motor,two new rotor structures of the same-pole permanent magnet iron bridge and V-shaped iron bridge segment permanent magnet are proposed,and two structures are obtained in the static field by Ansoft software.No-load leakage coefficient.At the same time,the influence of four parameters of permanent magnet adjacent pole spacing,permanent magnet and shaft distance,V-shaped magnetic steel angle and uneven air gap eccentricity on the weak magnetic performance of the motor in V-type permanent magnet synchronous motor is studied.Thirdly,in order to obtain better torque output and lower cogging torque whileachieving better weak magnetic speed regulation capability,the above four rotor parameters are optimized as optimization variables through the Taguchi algorithm,and before and after optimization.The results were compared to verify the superiority of the Taguchi algorithm.Finally,the cogging torque of the motor is further optimized by means of the stator crown opening auxiliary slot when the rotor parameters are determined.By analyzing the suppression of cogging torque by three different groove types:rectangular,angular and semi-circular,the groove type with the best suppression effect on the cogging torque of the built-in V-type permanent magnet synchronous motor is obtained,and the slotting is studied.After the impact on other properties of the motor.