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<p>The conventional switching-state phase shift method, while enabling low-cost phase current reconstruction for permanent magnet synchronous motors (PMSMs), introduces asymmetric switching sequences within carrier cycles, generating certain phase current harmonics. To mitigate this issue, the shunt resistor is moved from the traditional dc-link terminal to the middle branch between the upper arms of phases A and B in the inverter, and a new switching-state phase shift method is proposed to reduce phase current harmonics. Existing hybrid modulation strategies for this topology exhibit significant phase current harmonics due to the utilization of active zero-state pulse width modulation (AZSPWM), and face modulation index limitations because of edge reconstruction dead zones (RDZs). Meanwhile, the proposed method achieves lower phase current harmonics through minimal phase shift operations while expanding the linear modulation range by 6.8% through a dynamic zero-vector allocation method. Simulation and experimental results validate the effectiveness of the proposed method.</p>

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Improved switching-state phase shift method-based phase current reconstruction for low-power PMSM drives with lower phase current harmonics

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Xiang Wu,
  • Jieguang Li,
  • Boliang Wu,
  • Haifeng Yue,
  • Xiao Zhang

摘要

The conventional switching-state phase shift method, while enabling low-cost phase current reconstruction for permanent magnet synchronous motors (PMSMs), introduces asymmetric switching sequences within carrier cycles, generating certain phase current harmonics. To mitigate this issue, the shunt resistor is moved from the traditional dc-link terminal to the middle branch between the upper arms of phases A and B in the inverter, and a new switching-state phase shift method is proposed to reduce phase current harmonics. Existing hybrid modulation strategies for this topology exhibit significant phase current harmonics due to the utilization of active zero-state pulse width modulation (AZSPWM), and face modulation index limitations because of edge reconstruction dead zones (RDZs). Meanwhile, the proposed method achieves lower phase current harmonics through minimal phase shift operations while expanding the linear modulation range by 6.8% through a dynamic zero-vector allocation method. Simulation and experimental results validate the effectiveness of the proposed method.