Inter-turn Fault Identification of Surface-Mounted Permanent Magnet Synchronous Motor Based on Inverter Harmonics

Fengyang Gao, Guoheng Zhang, Mingming Li, Yunbo Gao and Shengxian Zhuang
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Fengyang Gao: School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Guoheng Zhang: School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Mingming Li: School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Yunbo Gao: School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Shengxian Zhuang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China

Energies, 2020, vol. 13, issue 4, 1-13

Abstract: Inter-turn short-circuit faults can lead to further faults in motors. This makes monitoring and identifying such faults particularly important. However, because of interference in their working environment, fault signals can be weak and difficult to detect in permanent magnet synchronous motors. This paper proposes a method for overcoming this by extracting the inverter harmonics as an excitation source and then extracting characteristic of fault measurements from the negative sequence voltage. First of all, a model of permanent magnet synchronous motor faults is established and a fault negative sequence voltage is introduced to calculate the fault indicators. Then the high frequency harmonic excitation in the voltage is extracted. This is injected into the original voltage signal and the high frequency negative sequence component is separated and detected by a second-order generalized integrator. Simulation results show that the proposed method can effectively identify inter-turn short-circuit faults in permanent magnet synchronous motors while remaining highly resistant to interference. The method is especially effective when the severity of the fault is relatively small and the torque is relatively large.

Keywords: permanent magnet synchronous motor; inter-turn short-circuit fault; inverter harmonics; negative sequence voltage; fault identification (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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