定子模块化混合励磁永磁电机短路特性分析

Short Circuit Characteristics Analysis of Modular Stator Hybrid-Excited Permanent Magnetic Machine

电机因短路故障会产生较大的短路电流,严重时可能烧毁定子绕组。针对混合励磁永磁电机,提出了在定子齿引入径向气隙的定子模块化结构以降低电机匝间短路电流。首先通过建立该电机的解析磁路模型,分析了短路匝数与短路位置对绕组电感的影响。其次利用Maxwell分别对所提结构与传统混合励磁永磁电机的匝间短路电流进行分析并比较。结果表明,与传统混合励磁永磁电机相比,所提出的定子模块化混合励磁永磁电机的短路电流可以降低16.38%,提升了电机的可靠性。

The motor will produce a large short circuit current when the short circuit fault occurs,which may burn the stator windings in serious cases.In order to reduce the short circuit current of the permanent magnet machine,a modular stator hybrid-excited stator slot permanent magnet(HSSPM)machine is proposed by introducing the radial flux gap on the stator teeth.Firstly,the influence of the turns and the position on the short circuit windings on induct-ance was analyzed by establishing the analytical magnetic circuit model.Secondly,the inter-turn short circuit current of the modular stator HSSPM machine and alternate teeth wound HSSPM machine was analyzed and compared by Maxwell.Compared with alternate teeth wound HSSPM machine,the short circuit current of modular stator HSSPM machine can be reduced by 16.38%,which reliability is improved.