Shaft Grounding Ring: A Protective Shield Against Electrocorrosion For EV Motors
Time: 2025-10-17 16:23:17     Copyfrom: SuZhou Volsun Electronics Technology Co.,Ltd.

As new energy vehicles continue to pursue longer driving range and greater power, the drive motor, as the "heart" of the vehicle, faces increasing demands for reliability, directly impacting its performance and lifespan. However, with the widespread adoption of high-frequency PWM technology, shaft voltage and current issues caused by common-mode voltage are becoming increasingly prominent. This current can easily penetrate the bearing oil film, causing electrocorrosion pits and spots, and in severe cases, leading to motor failure. Industry data indicates that bearing electrocorrosion has become a leading cause of drive motor failure. To address this common challenge, Volsun, leveraging nearly two decades of experience in polymer material research and development, has launched the VS-RD series shaft grounding ring, providing an efficient and reliable solution to electrocorrosion.

The VS-RD shaft grounding ring utilizes a unique coated conductive fiber technology, effectively providing a layer of protective armor for motor bearings. This design creates a low-impedance electrical path, significantly reducing the shaft voltage between the shaft and the housing, mitigating the risk of bearing breakdown due to current flow. It also provides a prioritized discharge path for harmful shaft current, safely directing it to the ground terminal. This effectively prevents current from flowing through the bearings, significantly delaying the onset of electrical corrosion and extending the overall motor life.

This shaft grounding ring also performs exceptionally well in extreme environments. Its excellent wear and weather resistance ensures stable operation even under harsh operating conditions such as high temperature and high humidity. Maintenance-free throughout the motor's lifecycle, it easily handles diverse operating scenarios, from frequent urban start-stop driving to continuous high-speed driving, providing reliable all-weather protection for new energy vehicles.

Technically, the VS-RD conductive ring excels in channeling shaft current and suppressing shaft voltage, effectively blocking current-induced corrosion on bearings and preventing pitting and electrical corrosion spots. Furthermore, its excellent environmental adaptability and wear resistance ensure stable motor operation under complex driving conditions, meeting the long-life and high-stability requirements of core components in new energy vehicles.

Currently, this product is widely used in drive motor systems for various new energy vehicles. It precisely addresses the issue of bearing electrical corrosion caused by high-frequency PWM technology, ensuring smooth and reliable power output and adapting to diverse driving scenarios, from urban commuting to high-speed cruising.

With nearly two decades of experience in materials research and development, Volsun has a deep understanding and practical experience in addressing electrical corrosion issues in drive motors. Its products have been recognized and established long-term partnerships with several major new energy vehicle manufacturers. Contact us for professional technical support and sample testing services.