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<p>Impulse frequency response analysis (IFRA) has emerged as a promising technique for detecting winding faults in salient pole synchronous machines due to its high sensitivity and fast response. However, its accuracy is still affected by external influencing factors that remain insufficiently studied. This paper investigates how factors such as machine reassembly, ambient temperature, rotor position, non-measured and measured phase faults influence IFRA diagnostic results. A 7.5-kW test platform was constructed not only to simulate various fault conditions but also to conduct controlled tests under different influencing factors. Experimental results show that rotor position significantly affects low- and mid-frequency responses, while ambient temperature induces observable downward shifts in resonance frequency and reduced sharpness. Faults in non-measured phases introduce distortions in high-frequency ranges of measured phase IFRA curves, with gain deviations reaching − 8.61%. Meanwhile, faults occurring within the measured phase cause more severe and broadband distortions. In contrast, machine reassembly has minimal impact. These findings emphasize the importance of maintaining consistent test conditions and improve the practical reliability of IFRA-based diagnostics for salient pole synchronous machines.</p>

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Study on the influencing factors in impulse frequency response analysis for salient pole synchronous machines

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Yuqian Song,
  • Zhongyong Zhao,
  • Liang Cao,
  • Lian Chen,
  • Gaohui He,
  • Yueqiang Yu

摘要

Impulse frequency response analysis (IFRA) has emerged as a promising technique for detecting winding faults in salient pole synchronous machines due to its high sensitivity and fast response. However, its accuracy is still affected by external influencing factors that remain insufficiently studied. This paper investigates how factors such as machine reassembly, ambient temperature, rotor position, non-measured and measured phase faults influence IFRA diagnostic results. A 7.5-kW test platform was constructed not only to simulate various fault conditions but also to conduct controlled tests under different influencing factors. Experimental results show that rotor position significantly affects low- and mid-frequency responses, while ambient temperature induces observable downward shifts in resonance frequency and reduced sharpness. Faults in non-measured phases introduce distortions in high-frequency ranges of measured phase IFRA curves, with gain deviations reaching − 8.61%. Meanwhile, faults occurring within the measured phase cause more severe and broadband distortions. In contrast, machine reassembly has minimal impact. These findings emphasize the importance of maintaining consistent test conditions and improve the practical reliability of IFRA-based diagnostics for salient pole synchronous machines.