定子槽偏移的内置式永磁同步电机的优化与分析

为降低永磁同步电机齿槽转矩和提高电机输出性能，以三相8极36槽内置组合式永磁同步电机为例，提出了一种电机定子槽偏移的方法。首先，通过理论推导定子齿气隙磁导函数，建立电机定子槽偏移数学模型；其次，对不同定子偏移槽数下不同偏移角度的齿槽转矩峰值、输出转矩以及转矩脉动的影响做出分析，利用自适应遗传算法确定电机定子偏移槽数偏移角度下的目标值；最后，通过试制样机进行实验。结果表明，优化后的电机齿槽转矩峰值降低了49.56%，转矩脉动降低了39.2%，平均输出转矩得到适当提升，气隙磁密谐波得到适当降低，同时，平均输出转矩增大，电机输出性能得到提升。所提定子槽偏移结构及多目标联合仿真方法具有一定的合理性和有效性，可为同类型电机的齿槽转矩优化和输出性能提高提供参考。

Performance optimization and analysis of built-in permanent magnet synchronous motor based on stator slot offset

In order to reduce the permanent magnet synchronous motor cogging torque and improve the motor output performance, a method of motor stator slot offset was proposed with the example of 3-phase 8-pole 36-slot built-in combined permanent magnet synchronous motor. Firstly, a mathematical model of motor stator slot offset was established by theoretically deriving the stator tooth air gap permeability function. Secondly, the effects of peak cogging torque, output torque and torque pulsation at different offset angles under different numbers of stator slot offsets were analyzed, and adaptive genetic algorithms were used to determine the target values under the offset angles for the number of stator slot offsets. Finally, a trial prototype was produced and the experiment was conducted. The results show that the peak cogging torque of the optimized motor is reduced by 49.56%, the torque pulsation is reduced by 39.2%, the average output torque is appropriately improved, and the air-gap magnetic density harmonics are appropriately reduced; the average output torque increases and the motor output performance is improved. The proposed stator slot offset structure and multi-objective joint simulation method are rational and effective, which can provide some reference for cogging torque optimization and output performance improvement of the same type of motors.