电动汽车用六相永磁容错电机的分析和设计

Analysis and design of a six-phase fault-tolerant PM machine used for EVs

为需满足容错电机各相绕组间的电隔离、物理隔离、磁隔离、热隔离,设计分析、设计一种采用分数槽集中绕组的电动汽车用六相永磁同步容错电机。通过磁动势谐波分析,提出一种新的极槽配合方案以减小因采用集中绕组而带来的永磁体涡流损耗,同时降低了转子极对数,减小了定子铁心损耗。通过分析集中绕组电机产生转矩波动的原因,以及相间解耦后dq0变换下的电感矩阵,确定容错电机的转子设计形式。最后给出整体的电机设计方案和性能参数。

Fault-tolerant permanent-magnet machine （FTPM） is an ideal choice for the drive motor in electric vehicle （EV） applications because of its advantages in control performance, efficiency, torque density and the capacity of operating under the failure of windings and converter. This paper designs a sixphase FTPM used for EV. To meet the requirements of physical and magnetic separation of the various phases, single-layer fractional-slot concentrated windings （FSCW） were adopted. A slot and pole combination was proposed to reduce the eddy loss in permanent magnet resulting from the use of FSCW, and the iron loss declined with the decrease of the number of poles. By analyzing the torque ripple caused by concentrated windings and the inductance matrix in dqO-coordinate in the case of decoupling of various phases, the FTPM＇ s rotor type was confirmed. Finally, the prototype of a 6-phase FTPM was proposed and some performance parameters were listed.