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<p>The growing electrification of aerospace vehicles has led to increased demand for high-power-density aerospace generation systems. The permanent magnet synchronous generator (PMSG) is extensively utilized in aerospace applications owing to the PMSG’s high power density and excellent electromagnetic performance. However, challenges such as demagnetization difficulties, large short circuit currents, and the extremely low tensile strength of permanent magnets, which can cause fragmentation, pose significant safety risks during high-speed operation. To tackle the above-mentioned challenges, a synchronous reluctance generator with a laminated composite rotor (SynRG-LCR) is proposed. The design employs a laminated composite solid rotor with an integral frame made of non-magnetic high-strength alloy, with embedded magnetic high-strength alloys and permanent magnets, thereby reducing mechanical stress on the rotor and enhancing the rotor’s mechanical integrity. Additionally, the permanent magnet in the proposed design serves only to supply remanent flux to the magnetic circuit, leading to a considerably smaller volume. Based on the operational principles of the SynRG-LCR and finite element simulations of short circuit faults, we conducted simulation analyses under various operating conditions of the power generation system. Results demonstrate that the proposed scheme enables self-excitation and voltage buildup in the generator. Stable operation is maintained under rated high-speed conditions. Under load short circuit fault conditions, the steady-state short circuit current is merely 9%–25% of the rated current, demonstrating that the SynRG-LCR features excellent short circuit withstand capability.</p>

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Mechanism Analysis of a Novel High-Speed Synchronous Reluctance Aerospace Generator System with Short Circuit Fault Tolerance

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Ze-Xin Xv,
  • Bo Zhao,
  • Li-Jun Jiang,
  • Kun Wang,
  • Chang-Jie Wei,
  • Bing-Lin Lu

摘要

The growing electrification of aerospace vehicles has led to increased demand for high-power-density aerospace generation systems. The permanent magnet synchronous generator (PMSG) is extensively utilized in aerospace applications owing to the PMSG’s high power density and excellent electromagnetic performance. However, challenges such as demagnetization difficulties, large short circuit currents, and the extremely low tensile strength of permanent magnets, which can cause fragmentation, pose significant safety risks during high-speed operation. To tackle the above-mentioned challenges, a synchronous reluctance generator with a laminated composite rotor (SynRG-LCR) is proposed. The design employs a laminated composite solid rotor with an integral frame made of non-magnetic high-strength alloy, with embedded magnetic high-strength alloys and permanent magnets, thereby reducing mechanical stress on the rotor and enhancing the rotor’s mechanical integrity. Additionally, the permanent magnet in the proposed design serves only to supply remanent flux to the magnetic circuit, leading to a considerably smaller volume. Based on the operational principles of the SynRG-LCR and finite element simulations of short circuit faults, we conducted simulation analyses under various operating conditions of the power generation system. Results demonstrate that the proposed scheme enables self-excitation and voltage buildup in the generator. Stable operation is maintained under rated high-speed conditions. Under load short circuit fault conditions, the steady-state short circuit current is merely 9%–25% of the rated current, demonstrating that the SynRG-LCR features excellent short circuit withstand capability.