动态偏心的内置式永磁电机齿槽转矩研究

Study of Cogging Torque in Interior Permanent Magnet Motors with Dynamic Air-Gap Eccentricity

分析了动态偏心状态下内置式永磁同步电机的齿槽转矩特性,通过二维有限元法进行了较为详细的计算,比较了不同程度动态气隙偏心情况下的齿槽转矩变化趋势。结果表明,动态气隙偏心的存在会使齿槽转矩产生波动;在动态气隙偏心故障的初期齿槽转矩变化并不明显,当动态偏心度增加到一定程度时,齿槽转矩的幅值以较快的速度增大。

The cogging torque of an interior permanent magnet motor under dynamic air-gap eccentricity conditions was analyzed. 2-dimensional finite element approach was applied in the calculation of cogging torque. The variations of cogging torque under different levels of dynamic eccentricity were compared. It is found that the existence of dynamic air-gap eccentricity would introduce torque fluctuation. In the initial stage of dynamic air-gap eccentricity fault, the variation of cogging torque is not very distinct. When the level of dynamic air-gap eccentricity reaches a certain level, the cogging torque may increase at a rapid speed.