【摘要】 永磁电机的齿槽转矩引起转矩脉动，影响电机系统的低速性能和控制精度。该文建立齿槽转矩与气隙磁场谐波的模型，分析低次谐波磁场对齿槽转矩的影响规律，揭示齿槽转矩产生机理。通过部分磁极反余弦削极技术重构气隙磁场波形，抵消3、5、7次谐波磁场引起的齿槽转矩，实现电机齿槽转矩的抑制。与现有减小齿槽转矩的方法相比，所提方法通过间接控制气隙磁场减小齿槽转矩。通过有限元法对所提的方法进行验证，并研制1台12槽8极部分反余弦削极转子永磁电机，进行相关测试。更多还原

【Abstract】 The cogging torque of permanent magnet(PM)machines can cause torque ripple,leading to reduced low-speed performance and control precision of the system.This study aims to establish the relationship between airgap field harmonics and cogging torque,with a focus on the influence of low order harmonics(3rd,5th,and 7th).The cogging torque generation mechanism is analyzed from the perspective of magnetic field modulation,and a magnet partial inverse cosine shaping method is proposed to reconstruct airgap magnetic field harmonics.Cogging torque can be significantly reduced by optimizing the 3rd,5th and 7th airgap field harmonics.Compared with existing methods,the proposed method achieves cogging torque reduction by indirectly controlling the airgap field,which is much more time-saving.The effectiveness of the method is verified using finite element analysis.A 12-slot/8-pole PM machine with a partial inverse cosine shaped rotor has been manufactured and measured for verification.更多还原