基于磁极分块与转子开槽削弱永磁电机齿槽转矩

为了提高6极72槽永磁直驱风力发电机的运行性能，提出了磁极分块与转子开槽相结合削弱齿槽转矩的方法。根据齿槽转矩的解析式和叠加原理，分析得出磁极分块和转子开辅助槽对削弱齿槽转矩的有效性。基于Maxwell有限元软件分别研究了永磁体的磁极分块、转子开槽对齿槽转矩的影响，给出了最佳的磁极分块数和磁极间隔以及转子辅助槽槽深和开槽位置。通过对比分析优化前后的电机仿真结果可知，该方法使电机的齿槽转矩得到了显著的削弱，同时电机的其他性能符合技术要求。

Cogging Torque Reduction of Permanent Magnet Motor with Permanent Magnet Segmentation and Rotor Slotting

In order to improve the operation performance of 6-pole 72 slot permanent magnet direct-drive wind turbine, a method of reducing cogging torque by combining permanent magnet segmentation with rotor slotting is proposed. According to the analytical formula and superposition principle of cogging torque, the effectiveness of permanent magnet segmentation with rotor slotting on reducing cogging torque is analyzed. Based on Maxwell finite element software, the influence of permanent magnet segmentation and rotor slotting on cogging torque are studied respectively, and the optimal number of pole segmentation and magnetic pole spacing, as well as slotting radius and angle are given. By comparing and analyzing the simulation results of the motor before and after optimization, it can be seen that the cogging torque of the motor has been significantly reduced, while ensure that the other performance of the motor meets the technical requirements.