Abstract
In this paper, the influence of impact damage to the induction motors on
the zero-sequence voltage and its spectrum is presented. The signals
detecting the damages result from a detailed analysis of the formula
describing this voltage component which is induced in the stator windings
due to core magnetic saturation and the discrete displacement of windings.
Its course is affected by the operation of both the stator and the rotor.
Other fault detection methods, are known and widely applied by analysing
the spectrum of stator currents. The presented method may be a complement
to other methods because of the ease of measurements of the zero voltage
for star connected motors. Additionally, for converter fed motors the zero
sequence voltage eliminates higher time harmonics displaced by 120
degrees. The results of the method application are presented through
measurements and explained by the use of a mathematical model of the
slip-ring induction motor.
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