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Research on typical fault detection of AC motor stator based on open transformer method
  • yucai wu,
  • long zhang
yucai wu
North China Electric Power University

Corresponding Author:[email protected]

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long zhang
North China Electric Power University
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Abstract

The general diagnosis of typical faults of AC motor stator can simplify the detection steps, improve the detection efficiency, and help to shorten the outage time of motor maintenance. In this paper, the open transformer method is proposed to detect the inter-turn short-circuit (ITSC) fault of stator winding and the inter-lamination short circuit fault of stator core. Firstly, the expression of the flux in the open transformer core before and after the typical fault of the AC motor stator is derived. The expression of the induced electromotive force of the open transformer winding is further obtained, and the variation law of the induced electromotive force before and after the fault is obtained. Different finite element electromagnetic simulation models are established for the two typical faults, and experimental schemes are designed for verification. The final simulations and experiments show that the amplitude of the induced electromotive force of the open transformer winding changes significantly after the typical fault of the AC motor stator , and its amplitude varies with the fault location and fault degree, which proves the feasibility of the open transformer method for the general detection of the typical fault of the AC motor stator.