Fault-tolerant of Hall-effect sensors in permanent magnet in-wheel motor drives

In this paper, Hall-effect sensor faults are investigated in Sinusoidal-current-fed Permanent Magnet In-wheel Motor (PMIM) drives. And an effective methodology for their diagnostic and compensation is proposed. In particular, fault diagnostic only based Hall sensors signal, at the rising or falling edges of Hall signal, fault types of Hall sensors are diagnosed according to the specific type of Hall signal transitions and the current state of Hall signal. Fault-compensation based on reduced-order observer which has been devised to be free from the mechanical parameters (such as, inertia) in rotor position estimation process. The validity and effectiveness of the proposed methods are verified by experiments on PMIM with excessive and variable load.