逆变器供电的永磁同步电机(PMSM)中电子器件的高频开关会产生高频的电流时间谐波,进而引起永磁体涡流损耗的显著增加。给出了一种考虑电流时间谐波的永磁体涡流损耗计算的解析式,详细分析了永磁体尺寸和透入深度与涡流损耗之间的关系,并通过一个理想的3D模型进行验证。以1台逆变器供电的48槽8极PMSM为例进行涡流损耗仿真计算,结果表明:永磁体合理的分块数可以有效减少涡流损耗。

In the inverterpowered permanent magnet synchronous motor (PMSM), high frequency current time harmonics was produced by the high frequency switch tube, and the eddy current loss of permanent magnet (PM) was increased. Considering the current time harmonics in PM, an analytic equation about the eddy current loss was proposed. The relationship between the dimension of PM, penetration depth and eddy current loss was deduced in details. Then the conclusion was drawn. The eddy current loss of PM was greatest when the axial or circumferential dimension of PM was twice the penetration depth, and the accuracy of the conclusion was verified by an ideal 3D model. In addition, the eddy current loss simulation of a 48slot 8pole watercooled PMSM powered by an inverter was taken as an example. The results showed that a reasonable number of segments in PM could effectively reduce the eddy current loss.

TM 302

上海市产学研合作年度计划项目(沪CXY2015014)