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<p>During the non-ideal commutation of BLDCM, the discrepancy in current slew rates between the incoming and outgoing phases induces fluctuations in the non-commutating current, thereby causing considerable torque ripple. This issue restricts the application of BLDCM in high-precision scenarios. Existing optimized modulation strategies still have room for enhancement regarding low-speed commutation time, simplification of PWM control modes, and reduction of switching losses. This paper presents a novel three-phase segmented modulation (TPSM) strategy aimed at mitigating commutation torque ripple. TPSM divides each PWM cycle into four intervals based on the states of the three-phase switches and allocates the duty ratios of each interval according to the principle of maximizing the commutation rate. By collaboratively controlling the current variation rates of the three phases and the commutation time, this strategy ensures a rapid and stable transition of the non-commutating current. Compared with traditional methods, TPSM achieves a simpler PWM control mode and lower switching losses. Experimental results demonstrate that TPSM effectively suppresses commutation torque ripple across the entire speed range, thus proving its feasibility and effectiveness.</p>

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Three-Phase Segmented Modulation Method for Torque Ripple Suppression in Brushless DC Motor

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Yikun You,
  • Yang Zhou,
  • Runhui Yao,
  • An Zheng,
  • Jin Zhou

摘要

During the non-ideal commutation of BLDCM, the discrepancy in current slew rates between the incoming and outgoing phases induces fluctuations in the non-commutating current, thereby causing considerable torque ripple. This issue restricts the application of BLDCM in high-precision scenarios. Existing optimized modulation strategies still have room for enhancement regarding low-speed commutation time, simplification of PWM control modes, and reduction of switching losses. This paper presents a novel three-phase segmented modulation (TPSM) strategy aimed at mitigating commutation torque ripple. TPSM divides each PWM cycle into four intervals based on the states of the three-phase switches and allocates the duty ratios of each interval according to the principle of maximizing the commutation rate. By collaboratively controlling the current variation rates of the three phases and the commutation time, this strategy ensures a rapid and stable transition of the non-commutating current. Compared with traditional methods, TPSM achieves a simpler PWM control mode and lower switching losses. Experimental results demonstrate that TPSM effectively suppresses commutation torque ripple across the entire speed range, thus proving its feasibility and effectiveness.