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This paper describes how a mechanical disturbance on the shaft of a variable-speed permanent-magnet motor is propagated to the supply input side of the drive system, and therefore may be detected by monitoring specific frequency components in the rectifier input current. The propagation of the disturbance from the torque disturbance to the motor current, then to the dc link current, and finally to...
A scheme has been proposed whereby the presence of mechanical faults in a variable speed motor drive is detected by monitoring the frequency content of the rectifier input current. This paper provides a detailed theoretical analysis of the proposed diagnostic method to determine the major influences on its resolution and accuracy. These include the influence of the resolution of the data acquisition...
This paper presents a novel scheme to predict and detect different mechanical faults in a variable speed motor drive (e.g. eccentricity, defective bearings, faulty gearbox), by monitoring components in the rectifier input current. The scheme is based on the principle that a torque disturbance in the machine (produced by the mechanical fault) propagates from the machine through the PWM inverter, the...
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