摘要
永磁同步电机永磁磁动势和电枢反应磁动势作用于磁路在气隙处除产生基波磁场外,还产生各种谐波磁场。气隙处各种谐波磁场相对于永磁体转速不同,相对转速不为零的谐波磁场会在永磁体内部感应出电场产生涡流损耗,引起永磁体发热甚至去磁。从产生涡流损耗原因入手,在二维直角坐标系下建立电磁场方程,得出了永磁体涡流损耗的解析解,并分析涡流损耗与电机参数的关系。对一种直驱式表贴永磁同步风力发电机进行了解析计算,并利用有限元进行了仿真分析,仿真结果表明此方法可行。
Air gap magnetic field from permanent magnet(PM) and stator windings consists of fundamental components and harmonic components. The harmonic components cause eddy current loss in PM, which may lead to demagnetization as the speed of harmonic components and rotor is differ. This paper explains the reasons of eddy current loss in PM, and it presents an analytical method for calculating the PM eddy current loss. The analytical expression for the PM eddy current loss is derived from the electromagnetic equation in rectangular coordinate system, and the relationship between eddy current loss and motor parameters is analyzed. The results of the PM eddy current loss of a directly driven wind turbine with surface mount PMSM calculated by analytic method and 2D finite element method(FEM) is compared, the proposed method is confirmed.
出处
《大电机技术》
北大核心
2014年第6期9-14,共6页
Large Electric Machine and Hydraulic Turbine
关键词
永磁同步电机
涡流损耗
表贴式
解析计算
permanent magnet synchronous machine
eddy current loss
surface mount PMSM
analytical calculation
