Research and Application of Order Analysis Technology Without Tachometer Under Variable Speed Condition

Under the condition of variable speed, the traditional signal processing method cannot accurately determine the fault location of motor bearing. This paper proposes and studies the order analysis method without tachometer. Through the short-time Fourier transform and speed tracking of the collected fault signal, the speed signal of the motor fault bearing is obtained indirectly. The extraction process of the speed signal is completed and the order analysis is carried out to obtain the bearing fault diagnosis results. The results show that this method can effectively judge the fault location of motor bearing.