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<p>Quick stopping of permanent-magnet synchronous motors (PMSMs) without DC bus overvoltage or phase current surges had remained challenging. This paper proposed an active short-circuit (ASC) quick-stop strategy augmented by a current pre-processing stage that suppressed transient overcurrent while preventing DC bus overshoot. <i>Firstly</i>, closed-form time domain expressions were derived for the currents in the synchronous rotating reference frame (<i>d</i> − <i>q</i>), obtained from the three-phase <i>abc</i> currents via the Clarke and Park transformation, to describe the ASC-induced transient. <i>Then</i>, the time domain square of the current-vector norm <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(S(t)=i_d^2(t)+i_q^2(t)\)</EquationSource> </InlineEquation> was derived and analyzed to locate and bound the transient maximum. <i>Last</i>, it was proven that the transient peak necessarily exceeded the ASC steady-state current unless ASC was initiated with the steady-state short-circuit current (SSC); this led to a pre-processing law that regulated the initial current to that value before ASC. Simulation and experimental results verified the analysis and demonstrated safe, rapid stopping with suppressed current overshoot and no DC bus overvoltage.</p>

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An Active Short Circuit Method for PMSM Quick Stop with Current Pre-Processing

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • Tong Wang,
  • Yuwei Chen,
  • Haoda Jiang,
  • Yanjun Li,
  • Siyi Wang

摘要

Quick stopping of permanent-magnet synchronous motors (PMSMs) without DC bus overvoltage or phase current surges had remained challenging. This paper proposed an active short-circuit (ASC) quick-stop strategy augmented by a current pre-processing stage that suppressed transient overcurrent while preventing DC bus overshoot. Firstly, closed-form time domain expressions were derived for the currents in the synchronous rotating reference frame (d − q), obtained from the three-phase abc currents via the Clarke and Park transformation, to describe the ASC-induced transient. Then, the time domain square of the current-vector norm \(S(t)=i_d^2(t)+i_q^2(t)\) was derived and analyzed to locate and bound the transient maximum. Last, it was proven that the transient peak necessarily exceeded the ASC steady-state current unless ASC was initiated with the steady-state short-circuit current (SSC); this led to a pre-processing law that regulated the initial current to that value before ASC. Simulation and experimental results verified the analysis and demonstrated safe, rapid stopping with suppressed current overshoot and no DC bus overvoltage.