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<p>Inter-turn short circuit (ITSC) is a common fault of permanent magnet synchronous motor (PMSM). Improper real-time monitoring of ITSC fault usually leads to greater damage to the PMSM. To enhance the ability of fault detection and location in PMSM, we propose a novel diagnosis method of Inter-turn short circuit fault based on reconstructed negative sequence current (NSC) and phase angle. First, we establish mathematical models of PMSM under healthy and faulty condition, and the variation law of NSC in PMSM under ITSC is theoretically analyzed. Second, the fundamental amplitude and initial phase angle of NSC are employed to reconstruct the fault detection indicator and fault location indicator. To avoid the deviation of three-phase currents, a fault location flag is introduced. Finally, <Emphasis Type="BoldItalic">k</Emphasis> serves as fault factor, which can characterize the severity of ITSC fault. The method proposed in this article does not require additional measurement devices, which can complete the diagnosis of incipient faults in the presence of speed fluctuations and certain inherent asymmetry. Theoretical derivation and experiments verify the effectiveness of the proposed method.</p>

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Detection and Location of Inter-Turn Short Circuit Fault in PMSM Based on Reconstructed Negative Sequence Current and Phase Angle

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Dongdong Li,
  • Mengqi Zhu,
  • Yao Zhao,
  • Shunfu Lin

摘要

Inter-turn short circuit (ITSC) is a common fault of permanent magnet synchronous motor (PMSM). Improper real-time monitoring of ITSC fault usually leads to greater damage to the PMSM. To enhance the ability of fault detection and location in PMSM, we propose a novel diagnosis method of Inter-turn short circuit fault based on reconstructed negative sequence current (NSC) and phase angle. First, we establish mathematical models of PMSM under healthy and faulty condition, and the variation law of NSC in PMSM under ITSC is theoretically analyzed. Second, the fundamental amplitude and initial phase angle of NSC are employed to reconstruct the fault detection indicator and fault location indicator. To avoid the deviation of three-phase currents, a fault location flag is introduced. Finally, k serves as fault factor, which can characterize the severity of ITSC fault. The method proposed in this article does not require additional measurement devices, which can complete the diagnosis of incipient faults in the presence of speed fluctuations and certain inherent asymmetry. Theoretical derivation and experiments verify the effectiveness of the proposed method.