In view of the harsh environment of the motor,it is prone to phasedeficiency(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 pro-posed.Theoretical analysis and simulation software validation have demonstrated that the proposed diagnosis strate-gy 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.
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