【目的】如何降低齿槽转矩是电机设计中的热点问题，目前已知在永磁同步电机(PMSM)定子齿上开槽可以有效抑制电机齿槽转矩，但在屏蔽式永磁同步电机(CPMSM)上开槽抑制齿槽转矩的可行性暂不明确。【方法】因此，本文以一台6极9槽CPMSM为研究对象，利用有限元法搭建了电机模型，对电机定子齿部进行开槽设计。然后在推导CPMSM齿槽转矩表达式的基础上，研究了定子齿开辅助槽对CPMSM齿槽转矩的影响。此外，本文还研究了辅助槽的开槽个数、槽型、开槽位置、槽口宽度和深度对齿槽转矩的削弱效果以及开槽前后电机性能对比。【结果】研究结果表明，与常规PMSM相比，CPMSM由于屏蔽套的存在使得开辅助槽抑制齿槽转矩效果不如常规PMSM。此外，通过研究得出开2个槽口宽度w=2.6 mm、槽口深度h=0.4 mm的矩形槽，辅助槽偏移角?=12.8°时对CPMSM齿槽转矩抑制效果最好。【结论】本文所提在CPMSM定子齿上开槽来抑制电机齿槽转矩的办法是可行的，同时通过开辅助槽降低了气隙磁密幅值和屏蔽套损耗，提高了CPMSM的效率。本文研究对CPMSM的优化与设计提供了参考。

[Objective] Reducing cogging torque is a key issue in motor design. It is widely recognized that slotting the stator teeth of permanent magnet synchronous motor (PMSM) can effectively suppress cogging torque. However, the feasibility of using this method for canned permanent magnet synchronous motor (CPMSM) remains unclear. [Methods] This study investigated a 6-pole, 9-slot CPMSM. A motor model was developed using the finite element method, and stator tooth slotting was implemented. Based on the derivation of the cogging torque expression for the CPMSM, the influence of auxiliary stator tooth slots on cogging torque was analyzed. In addition, the effects of slot number, slot shape, slot position, slot opening width, and slot depth on cogging torque reduction were studied, along with a performance comparison before and after slotting. [Results] The research results showed that, compared with conventional PMSM, the presence of a shielding sleeve in CPMSM reduced the effectiveness of auxiliary slotting for cogging torque suppression. Furthermore, identified as two rectangular slots with a width of w=2.6 mm, a depth of h=0.4 mm, and an offset angle of ??=12.8°, which achieved the best suppression performance on the CPMSM's cogging torque. [Conclusion] The proposed method of slotting the stator teeth of CPMSM to suppress cogging torque is feasible. Additionally, auxiliary slotting reduces the amplitude of air gap flux density and shielding sleeve losses, thereby improving motor efficiency. This study provides valuable insights for the optimization and design of CPMSM.

国家自然科学基金项目(62473061);辽宁省教育厅一般项目(LJ212410167024)