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<p>The high-frequency (HF) voltage injection technique is widely employed for estimating the rotor position in interior permanent magnet synchronous motors (IPMSMs) during low-speed operation. However, the use of fixed-frequency voltage injection generates significant audible noise, limiting its broader application potential. The optimal solution for this problem is designing injected signals via current power spectral density (PSD) analysis. In this way, acoustic noise reduction can be achieved by eliminating the discrete harmonics of the current PSD. To eliminate the discrete harmonics, a pseudo-random HF (PRHF) orthogonal square wave signal injection method is proposed in this paper. The PRHF signal is executed by randomly selecting and injecting square wave signals from a pair of distinct frequencies, where the injected signal is adjusted once each quarter period. Descriptions of the injected signals and a comparative analysis of the current PSD are carried out among the full-period-switch (FPS) PRHF, half-period-switch (HPS) PRHF, and quarter-period-switch (QPS) PRHF. Comparison results show that the QPS-PRHF scheme successfully eliminates all of the discrete harmonics in the noise spectrum, reducing the acoustic noise. The effectiveness and practicality of the algorithm are verified by experimental results.</p>

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Pseudo-random orthogonal square wave signal injection for sensorless IPMSM drives with noise reduction

  • 期刊论文

  • 发表日期：

    2025年1月4日

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  • Qinglun Chen,
  • Yuxiang Wu,
  • Xiaohong Wang,
  • Lin Zhou,
  • Yu Liang

摘要

The high-frequency (HF) voltage injection technique is widely employed for estimating the rotor position in interior permanent magnet synchronous motors (IPMSMs) during low-speed operation. However, the use of fixed-frequency voltage injection generates significant audible noise, limiting its broader application potential. The optimal solution for this problem is designing injected signals via current power spectral density (PSD) analysis. In this way, acoustic noise reduction can be achieved by eliminating the discrete harmonics of the current PSD. To eliminate the discrete harmonics, a pseudo-random HF (PRHF) orthogonal square wave signal injection method is proposed in this paper. The PRHF signal is executed by randomly selecting and injecting square wave signals from a pair of distinct frequencies, where the injected signal is adjusted once each quarter period. Descriptions of the injected signals and a comparative analysis of the current PSD are carried out among the full-period-switch (FPS) PRHF, half-period-switch (HPS) PRHF, and quarter-period-switch (QPS) PRHF. Comparison results show that the QPS-PRHF scheme successfully eliminates all of the discrete harmonics in the noise spectrum, reducing the acoustic noise. The effectiveness and practicality of the algorithm are verified by experimental results.