Abstract
AbstractBroken rotor bar (BRB) fault may cause deterioration of motor performance and interfere with normal production. Accurate detection of BRB fault is helpful in arranging overhaul and replacing equipment in advance. According to the theory of magnetic potential balance, the variation rule of the air‐gap flux density of the squirrel‐cage induction motor (IM) before and after the BRB fault is deduced in this paper. A large‐size measuring coil is embedded inside one stator slot wedge, and BRB fault is diagnosed by combining the time‐domain and frequency‐domain characteristics of the induced voltage of the measuring coil. In the stage of validity verification, a 200 kW and a 7.5 kW squirrel‐cage IM are selected to complete the finite element simulation and fault‐simulation experiments, respectively. Compared with the traditional motor current signal analysis method, the detection performance of BRB fault under different load levels is verified, which provides a new solution for the fault diagnosis of BRB fault of the squirrel‐cage IM. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
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