Open Device Fault Detection and Fail Safe Action Strategy for a Premium Class Electric Vehicle with a Dual Inverter fed Open Winding Motor

A premium class electric vehicle (EV) needs high drive system efficiency, low motor noise and limp-home capability of the traction drive when there is a component failure. A dual inverter fed open winding interior permanent magnet synchronous motor (DIF-OW-IPMSM) drive system satisfied all the above needs. In this paper, a new algorithm of inverter open-circuit fault diagnosis and fail-safe action strategy for the DIFOW-IPMSM drive system are proposed and presented to prove its high reliability. The proposed new algorithm is verified by suitable simulation and experimental results, and the safe limp-home capability of the DIF-OW-IPMSM drive system is demonstrated.