A Novel Fault Tolerance Structure of Arc Linear Flux Switching Permanent Magnet Motors Based on Redundant Winding

This article presents a novel structure of the arc linear flux switching permanent magnet motor (AL FSPM) based on the redundant winding to inhibit the rise of the motor losses and temperature due to the open-circuit fault tolerance. First, the structural characteristic of the AL FSPM is introduced. Then, the fault tolerance current of single-phase open-circuit fault is calculated for different winding connection forms. The fault tolerance performances under different conditions are compared from a special view of motor temperature rises. Finally, a novel structure for fault tolerance enhancement is proposed, which can effectively improve the freedom degree of the fault tolerance current by using redundant winding. This novel structure takes full advantage of the circumferential air gap between the arc stator. The calculation results show that the novel structure can allow the fault tolerance of open-circuit fault to have little influence on the motor copper losses and temperature rises while maintaining the on-load torque.