Online diagnosis of slight interturn short-circuit fault (ISCF) has always been difficult in low-speed permanent magnet synchronous motors (PMSMs). It is found that the residual zero-sequence voltage exists in healthy PMSMs due to the inherent unbalance of a low-speed motor. This article proposes a new ISCF diagnosis method based on zero-sequence voltage vector decomposition to solve this problem. The voltage vector whose phase angle is closest to the ISCF phase angle is extracted from the zero-sequence voltage vector, which improves the sensitivity of fault phase identification. Furthermore, the method of extracting phase voltage from PWM duty-cycle control voltage is proposed, which can reduce the error caused by measuring zero-sequence voltage with three-phase balanced resistance. Experiments demonstrate that the online detection limit of ISCF is reduced from 5% to 1% (short-circuit ratio) for a low-speed PMSM.


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    Title :

    Online Diagnosis of Slight Interturn Short-Circuit Fault for a Low-Speed Permanent Magnet Synchronous Motor


    Contributors:
    Zhang, Yecheng (author) / Liu, Guohai (author) / Zhao, Wenxiang (author) / Zhou, Huawei (author) / Chen, Qian (author) / Wei, Mingji (author)


    Publication date :

    2021-03-01


    Size :

    2333013 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English