Fault diagnosis and fault tolerant control of position signal for doubly salient permanent magnet motor

Position sensor is the key of exact commutation for brushless motor. The commutation information is incorrect when position sensor is faulted. And the output torque is reduced, and the speed is decreased or zero. The study on fault diagnosis and fault tolerant control of position signal is very necessary in order to increase system reliability. The method of real-time monitoring the state of position signal is proposed throughout studying position signal of doubly salient permanent magnet (DSPM) motor. The logical controller of commutation is restructured. The validity of fault diagnosis and fault tolerant control is verified by fault simulation and experiment.