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<p>Electric machines driven by variable frequency drives (VFDs) experience shaft voltage due to the continuous switching of these drives. The shaft voltage leads to pitting, fluting, and other detrimental effects in the bearings, which shorten their lifespan. Various shaft voltage mitigation strategies are proposed in the literature to address this issue, with the shaft grounding ring (SGR) being one of the most effective approaches. However, this method faces challenges related to maintenance and longevity. This paper presents a novel non-contact method for mitigating shaft voltage in interior permanent magnet synchronous motors (IPMSMs). The proposed design comprises a rotating capacitor setup with two basic parts. One is called the rotating plates, which are mechanically and electrically connected to the rotor shaft and rotate with it. The other part is named the stationary plates that remain fixed to the motor housing. This capacitive approach offers a maintenance-free, compact-sized, and non-invasive solution to the shaft voltage problem. The proposed method has been experimentally validated on a six-pole, nine-slot IPMSM, with results confirming a shaft voltage reduction of almost 70%. Moreover, the shaft voltage reduction rate can be enhanced further by increasing the applied capacitance.</p>

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Development and Performance Evaluation of a Rotating Capacitor for Shaft Voltage Mitigation in IPMSM

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Zuhair Abbas,
  • Byoung-Wook Jo,
  • Jin Hur

摘要

Electric machines driven by variable frequency drives (VFDs) experience shaft voltage due to the continuous switching of these drives. The shaft voltage leads to pitting, fluting, and other detrimental effects in the bearings, which shorten their lifespan. Various shaft voltage mitigation strategies are proposed in the literature to address this issue, with the shaft grounding ring (SGR) being one of the most effective approaches. However, this method faces challenges related to maintenance and longevity. This paper presents a novel non-contact method for mitigating shaft voltage in interior permanent magnet synchronous motors (IPMSMs). The proposed design comprises a rotating capacitor setup with two basic parts. One is called the rotating plates, which are mechanically and electrically connected to the rotor shaft and rotate with it. The other part is named the stationary plates that remain fixed to the motor housing. This capacitive approach offers a maintenance-free, compact-sized, and non-invasive solution to the shaft voltage problem. The proposed method has been experimentally validated on a six-pole, nine-slot IPMSM, with results confirming a shaft voltage reduction of almost 70%. Moreover, the shaft voltage reduction rate can be enhanced further by increasing the applied capacitance.