非均匀气隙结构内置永磁同步电机设计与优化

Design and optimization of permanent magnet synchronous motor with non-uniform air gap structure

为降低电机齿槽转矩与转矩脉动,首先以一均匀气隙V型内置永磁同步电机为基础,提出一种新型转子外圆分段弧非均匀气隙V型内置永磁同步电机,分析了电机齿槽转矩、转矩脉动性能,并验证该新型电机能够有效抑制齿槽转矩。为进一步降低齿槽转矩、减少转矩脉动,选取转子的极弧系数、定子槽口宽度、永磁体磁化方向长度、最大气隙长度作为优化参数,采用田口法对新型电机进行多目标优化设计,得到一组最优参数组合。优化后的仿真验证结果表明,齿槽转矩与转矩脉动都得到了有效降低,同时电机的空载反电势、气隙磁密、平均输出转矩等性能也有所提升。

In order to reduce the groove torque and torque ripple of the motor,a new type permanent magnet synchronous motor is proposed based on a V-type built-in permanent magnet synchronous motor with uneven air gap.The groove torque and torque ripple performance of the motor are analyzed,and the new motor is verified to be able to effectively suppress the groove torque.In order to further reduce the groove torque and torque fluctuation,the pole arc coefficient of rotor,the width of stator slot,the length of the magnetization direction of the permanent magnet and the length of maximum air gap are selected as the optimization parameters.The simulation results show that the groove torque and torque ripple are effectively reduced,and the no-load reverse potential,air gap flux density and average output torque of the motor are also improved.