关键词: 非接触式, 激感一体, 在线监测感知, 异步电机

Abstract: For the induction motor system without inverter or frequency converter power supply,this paper proposes a non-contact excitation-sensing integrated online insulation perception method for induction motors. The common-mode impedance spectrum of the motor is measured or known. On this basis,a weak fixed-frequency sinusoidal signal is injected into the motor system by means of a non-contact method. The average value of the peak common-mode current of the induction motor under different operating states is extracted. Significant variations can be observed in the average peak value,and such variations can be used to effectively perceive the insulation state of the induction motor. The feasibility of this method was verified by experiments.

Key words: non-contact, excitation-sensing integrated, online monitoring and sensing, asynchronous motor