永磁体分割可有效降低表贴式永磁同步电机(SPMSM)永磁体涡流损耗，且对电机性能影响最小。分析了永磁体轴向分割和圆周向分割与永磁体涡流损耗的关系，推导了SPMSM永磁体涡流损耗解析解。影响永磁体涡流损耗的因素，包括气隙磁密、齿谐波频率（转速和槽数）、齿距、永磁体电阻率和永磁体磁导率等。根据分析结果可知，永磁体圆周向分割对降低永磁体涡流损耗起主要作用，并通过试验验证了解析解的准确性。

Segmented permanent magnet (PM) can effectively reduce the eddy current loss of surface permanent magnet synchronous motor (SPMSM) with minimum performance impact. The relationship between axially and circumferentially segmented PM and the eddy current loss is analyzed. The analytical solution of PM eddy current loss of SPMSM is derived. The factors that affect the eddy current loss of PMs include air gap flux density, tooth harmonic frequency (speed and slot number), pitch, PM resistivity, PM permeability, etc. The analysis shows that circumferentially segmented PM plays main role to reduce PM eddy current loss. The accuracy of this analysis result is verified.