Detection and location of inter-turn short-circuit in a PMSM based on square of negative sequence current vector modulus

Abstract

Inter-turn short circuit (ITSC) is a common fault in permanent synchronous motor (PMSM). To enhance the ability of fault detection and location in PMSM, a diagnosis method based on square of negative sequence current vector modulus is proposed. First, we establish mathematical models of PMSM under healthy and faulty condition. Second, the amplitude and phase angle of second harmonic component in the square of negative sequence current vector modulus are analyzed theoretically based on superposition theorem and symmetric component method. Finally, the experiment is carried out on an 8-pole, 36-slot prototype, which verifies the effectiveness and accuracy of theory.