Rotor Fault Diagnosis of Squirrel Cage Asynchronous Motor Based on Instantaneous Reactive Power in α-β Coordinates
Wang Zhen1, Li Cheng1, Xu Yunzhi2, Dai Xianliang1
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China; 2. China University of Mining and Technology Xuzhou 221000 China
Abstract：The instantaneous reactive power’s expression of the squirrel-cage asynchronous motor is based on the instantaneous reactive power theory of the two-phase static coordinate, which is derived on the condition of normal motor, broken bar, rotor eccentricity and the rotor composite fault. Meanwhile, the fault characteristic frequency components are extracted, which are effectively exempted to be drowned easily by the base wave frequency. The fault characteristic frequency is identified easily and the purpose of the diagnosis of motor is achievable. The approach separates characteristic frequency of the rotor composite fault. Lastly, using double Hilbert transformation, DC component in reactive power was eliminated, which is helpful to emphasize the fault characteristic frequency. The stator current and voltage were collected by the experiment and the instantaneous reactive power was obtained by the theory of the coordinate transformation. The approach has been successfully verified by spectrum analysis of experimental results.
王臻, 李承, 许允之, 代贤良. α-β坐标系下瞬时无功功率型异步电机转子故障诊断[J]. 电工技术学报, 2015, 30(10): 179-186.
Wang Zhen, Li Cheng, Xu Yunzhi, Dai Xianliang. Rotor Fault Diagnosis of Squirrel Cage Asynchronous Motor Based on Instantaneous Reactive Power in α-β Coordinates. Transactions of China Electrotechnical Society, 2015, 30(10): 179-186.
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2015, Vol. 30 
