The method of rotor broken bars on-line monitoring in induction motor based on the air-gap torque is proposed.

提出了基于气隙转矩的鼠笼异步电动机转子断条故障在线监测方法。

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Finally, a new theory is proposed, in which the asymmetry of the motor induced by broken bars is taken as the criterion for determination of the degree of motor faults.

揭示了过去人们试图把定子电流中故障特征量的大小作为电机转子断条根数多少的判据的局限性，提出了把断条引起电机的不对称性作为电机故障程度判据的新的理论。

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Because the squirrel cage rotor real structure is considered, the model can be used to simulate the motors normal state, external faults and broken bars and rings faults exactly.

本文提出的模型能够对电动机的正常运行、外部故障以及笼型转子导条或端环断裂故障进行精确的仿真。

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