In order to improve the safety and reliability of the motor operation and reduce the misalignment phenomenon in the first installation of the motor, this paper proposed a method to detect the angular misalignment fault in the first installation of the motor based on the speed signal. This method does not require any health data and historical information, nor does it need to install additional vibration sensors. Firstly, the influence of the angular misalignment fault on the speed signal was analyzed. The fast Fourier transform and the least square method were used to analyze the speed signal. According to the coefficient of the quadratic term of the curve fitted by the change of the twice frequency amplitude with the rotation speed, and combined with the S-type distribution membership function, then the first installation misalignment of the motor was comprehensively evaluated. Finally, the simulation model and experimental platform of permanent magnet synchronous motor (PMSM) were built. The results show that the method is feasible and effective for the detection of angle misalignment fault in the first installation of PMSM, and has a great application prospect.
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2021, Vol. 36 
