中文摘要：

永磁同步电主轴在数控机床领域中应用越来越广泛,为了保证其精度,需降低齿槽转矩。针对永磁同步电主轴大小磁极不同个数和不同安装位置对齿槽转矩脉动的影响进行了研究。在阐述齿槽转矩产生机制和削弱方法的基础上,建立了永磁同步电主轴运动电磁场有限元模型,分别对永磁同步电主轴大小磁极的不同个数和不同安装位置的齿槽转矩进行了仿真。最后,利用MATLAB对仿真所得的数据进行计算、分析和对比。结果表明：适当的大小磁极个数和安装位置可有效地削弱永磁同步电主轴的齿槽转矩脉动。

英文摘要：

In the field of the computer numberical control（ CNC） machine,permanent magnet synchronous motor spindle（ PMSMS） was used more and more widely. In order to ensure its accuracy,the cogging torque should be reduced. Thus,this is to investigate the impact of different number and different installation position of different size of permanent magnet aimed for PMSMS on the cogging torque ripple. Based on description of the producing mechanism and reducing methods of cogging torque,the moving electromagnetic finite element model（ FEM） for PMSMS was built up. The cogging torque of different number and different installation position of different size of permanent magnet of the PMSMS was simulated respectively. At last,the data of the simulation was calculated,analyzed and compared by using MATLAB. The results show that the suitable number and the suitable installation position of different size of permanent magnet can reduce PMSMS＇s cogging torque effectively.