Research of Asynchronous Motor Fault Diagnosis based on Fourier Transform

Stator current of asynchronous motor includes fault characteristic frequency caused by broken rotor bars, however, the characteristic frequency is hard to extract as it is close to fundamental frequency. In this paper, square of the park’s vector modulus function is given; it can eliminate the impact of fundamental frequency. It is good for making Fourier Transform to the square of the park’s vector modulus, the fault motor is easy to recognise. It is an effective method.