Abstract:In view of the harsh environment of the motor, it is prone to phase deficiency (usually refers to a winding open circuit) faults. The traditional current detection method has high computational complexity, slow diagnosis speed and may have misdiagnosed conditions. Based on the traditional current detection method, a phase deficiency fault diagnosis strategy for permanent magnet fault-tolerant motor drive systems based on grey prediction is proposed. Theoretical analysis and simulation software validation have demonstrated that the proposed diagnosis strategy can quicker and more precisely diagnose winding open circuit faults compared to the traditional current detection method. It can also effectively avoid misdiagnosis when the motor speed or torque changes suddenly.