| New energy vehicles have been vigorously promoted around the world because they use non-fuel motor,use electricity instead of diesel and gasoline,and can use the distributed energy in power grid.The design of high-performance new energy vehicles has become an important research goal of major automobile manufacturers.Permanent magnet synchronous motor(PMSM)is more efficient than fuel motor and has stronger speed regulation ability,which is welcomed by the new energy vehicle industry.This paper will design a permanent magnet synchronous motor used in new energy vehicles,and complete the performance optimization of the motor.In this paper,a built-in permanent magnet synchronous motor with a rated power of 35 k W is selected as the research object.According to the performance requirements and technical indicators of new energy vehicles,and based on relevant professional knowledge and literature on motor design,the preliminary electromagnetic design of permanent magnet synchronous motor for new energy vehicles is completed.In order to ensure the high performance of new energy vehicles,the average torque and line back EMF should be improved as much as possible.However,in order to ensure the stability of vehicle operation,attention should also be paid to reducing cogging torque and torque ripple.The particle swarm optimization algorithm is used to optimize some parameters of stator teeth,motor air gap and permanent magnet,which successfully improves the average torque,torque ripple and the amplitude of line back EMF.After particle swarm optimization,the motor still maintains a large cogging torque.The cogging torque can be effectively reduced by combining Taguchi method with auxiliary slot and pole segment offset.The cogging torque and torque ripple of the optimized motor are obviously improved.At last,simulation analysis is carried out on the no-load magnetic field,air gap magnetic density,back potential and operation characteristics of the optimized motor. |
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