Yn. Wang et al., Real-time tracking of the torsional vibration of an induction motor supplied by distorted voltage sources, ELEC POW SY, 57(3), 2001, pp. 205-215
Shaft breaking is a potentially serious problem that can occur in a drive s
ystem. Most industrial control applications and home appliances employ powe
r electronic devices which may produce large concomitant harmonic currents.
The harmonic currents can distort the voltage source waveform, and induce
harmonic torque pulsations in the air gap. Torque pulsations normally cause
torsional vibrations which in some cases may exceed the maximum tolerance
of the shaft, and incurs cyclic fatigue fractures. This work presents a nov
el algorithm for estimating the time-varying harmonic components and fundam
ental frequency. It also evaluates the torsional vibration behavior in a di
storted-voltage-fed induction motor drive system. By comparing the estimate
d torsional vibration and experimental results, the accuracy of this new me
thod is verified. Based on the method proposed, the drive system can be eva
luated for potential risks by relatively simple and inexpensive procedures
to avert many possible catastrophic failures. (C) 2001 Elsevier Science B.V
. All rights reserved.