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http://dx.doi.org/10.5916/jkosme.2014.38.9.1141

Polarity discrimination of stator windings for 3 phase induction motors by using DC differential signals between mutual inductive voltages  

Choi, Soon-Man (Department of Education & Research, Korea Institute of Maritime & Fisheries Technology)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.38, no.9, 2014 , pp. 1141-1145 More about this Journal
Abstract
When the stator windings of 3 phase induction motors are in wrong condition, the mutual inductive responses between windings can be utilized for the purpose of diagnosing motors in that fault windings affect even the responses by DC excitation. Three phase induction motors are supposed to generate consistent inductive voltages at the remaining windings when exciting DC current is given to one of 3 windings, while the inconsistence of their voltages indicates the existence of disorder at electric motors. This study describes how the exciting current to one of three windings cause the other windings to create induced voltages, analyzing responses by transfer functions, and discloses whether or not the balance relation at two windings is normal in the way of measuring the differential voltage of their outputs. For experiment, common analog multi-testers is used for applying exciting current and measuring the output signal to confirm whether the proposed method is useful enough to be able to discriminate wrong polarities of windings onboard vessels including also the case of exciting current by AC.
Keywords
Polarity discrimination; Three phase induction motor; Mutual induction; Differential output;
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  • Reference
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