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Energies 2019, 12(3), 510; https://doi.org/10.3390/en12030510

Online Diagnosis of Inter-turn Short Circuit for Dual-Redundancy Permanent Magnet Synchronous Motor Based on Reactive Power Difference

Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
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Received: 23 November 2018 / Revised: 27 January 2019 / Accepted: 31 January 2019 / Published: 5 February 2019
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Abstract

The Dual-Redundancy Permanent Magnet Synchronous Motor (DRPMSM) with weak thermal coupling and no electromagnetic coupling among phase windings has two sets of three-phase symmetrical windings. Under normal conditions, two sets of windings can operate simultaneously, and once one set has an inter-turn short circuit fault (ISCF), the other set will operate alone, so a DRPMSM can be applied in fields with high reliability requirements. According to the equivalent circuit principle, a simplified model of a DRPMSM when ISCF occurs is established in this paper, and mathematical equations for the equivalent resistance, inductance and induction electromotive force (EMF) are derived. Based on the simplified circuit principle and instantaneous power theory, combined with the analysis of the fundamental wave in the two sets, an online diagnosis method of the ISCF for DRPMSM is proposed based on the reactive power difference and the feasibility of the method is verified by experiments. View Full-Text
Keywords: dual-redundancy permanent magnet synchronous motor; ISCF; instantaneous reactive power theory; online fault diagnosis dual-redundancy permanent magnet synchronous motor; ISCF; instantaneous reactive power theory; online fault diagnosis
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Chen, Y.; Zhao, X.; Yang, Y.; Shi, Y. Online Diagnosis of Inter-turn Short Circuit for Dual-Redundancy Permanent Magnet Synchronous Motor Based on Reactive Power Difference. Energies 2019, 12, 510.

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