A NOVEL DETECTION METHOD FOR BROKEN ROTOR BARS IN INDUCTION MOTORS

This paper addresses to develop high-sensitivity high-reliability detection scheme for induction motor broken rotor bar fault, taking into account the intrinsic asymmetry, air-gap eccentricity and rotor disalignment of induction motor. Firstly, numerical simulation and related experiments of broken rotor bar fault have been performed successfully. Secondly, a series of principles and laws, which assure the sensitivity and reliability of broken rotor bar fault detection in practice, are generalized and revealed, based on thorough analysis of simulation and experiment results. Finally, a novel scheme to detect broken rotor bar fault, which perfectly blends continuous subdivision Fourier transform, self-adaptive filter, rotor slot harmonics based slip estimation and detection threshold self-tuning technique, is proposed in this paper. Fault detection instances in laboratory demonstrate that the presented scheme is valid and effective.