Knowledge Center
Technical articles on shaft voltage, product selection, and installation - written for engineers and maintenance teams.
VOLSUN News
6 posts
Latest news, company updates, and product information from VOLSUN.
Technical Articles
17 articles
Technical articles and application guides about shaft grounding rings, cold shrink tubes, insulation protection, and material solutions.
Frequently Asked Questions
Q&A
Frequently asked questions about VOLSUN products, applications, installation, and customization.
VOLSUN News
- VOLSUN Named to KPMG China's 9th Leading Automotive Technology Enterprises 50 – Leading Technology List
VOLSUN was named to KPMG China's 9th Leading Automotive Technology Enterprises 50 – Leading Technology List, recognizing its material solutions spanning insulation, sealing, electrical conductivity, and thermal management for automotive e-drive and motor applications.
- Volsun Showcases E-Drive Material Solutions at TMC2026, Third-Generation Shaft Grounding Ring Recognized as Innovative Technology
Volsun joined TMC2026 in Nantong to present e-drive material solutions, including a third-generation shaft grounding ring recognized as innovative technology for electric motor reliability.
- Volsun to Exhibit at MOTOR CHINA 2026 | Shaft Grounding Ring Solutions for VFD Motor Protection
Volsun will exhibit shaft grounding ring and motor protection material solutions at MOTOR CHINA 2026, Hall E7 Booth H875, for VFD motor bearing protection and electric drive reliability.
- Volsun Wins Recognition in VFD Motor Protection Field (Award News 2026)
Volsun's fiber-based high-conductivity shaft grounding ring received the 2026 Electric Drive Innovation Technology Award, recognizing progress in VFD motor bearing protection.
- Volsun at 2026 Global XEV Drive System Conference
Volsun presented electric drive safety protection solutions at the 2026 Global XEV Drive System Conference in Shanghai, with shaft grounding rings for VFD motor bearing protection among the booth highlights.
Technical Articles
- VFD Pump Motor Bearing Failure: How to Diagnose Shaft Voltage and Bearing Current
Diagnose repeated VFD pump motor bearing failure by separating mechanical causes from shaft voltage, bearing current, and EDM damage—and decide when shaft grounding is a reasonable mitigation option.
- How to Measure Shaft Voltage in VFD Motors: Test Setup, Waveforms and Grounding Verification
A field procedure for measuring shaft voltage on VFD motors: probe placement, ground reference, waveform capture, before/after shaft-grounding checks, and the data needed for engineering review.
- Shaft Grounding Ring vs. Insulated Bearing: Which Does Your VFD Motor Need?
Compare shaft grounding rings and insulated bearings for VFD motor protection. Learn how they address different bearing-current paths and when both may be required.
- When Standard Shaft Grounding Rings Are Not Enough: 6 Cases That May Need Custom Design
A practical review of when a standard shaft grounding ring may fit—and when shaft geometry, space, speed, oil exposure, mounting, or OEM validation may require a custom design review.
- Inside VOLSUN’s Testing Laboratories: How We Evaluate Shaft Grounding Ring Quality
See how material inspection, dimensional measurement, wear testing and performance evaluation support VOLSUN shaft grounding ring development and customer application review.
- Why EV Drive Motors Need Shaft Current Protection
Inverter-induced shaft current can damage EV motor bearings through repeated electrical discharge. Learn how shaft grounding rings provide a controlled current path and support motor reliability.
- How to Select a Shaft Grounding Ring for EC and VFD Motors
A practical engineering guide to selecting shaft grounding rings for EC and VFD motors, covering shaft dimensions, speed, fiber configuration, installation, environment and validation.
- Why VFD Motors Need Shaft Grounding Rings to Prevent Bearing Failure
VFD-driven motors can develop shaft voltage and bearing current that lead to EDM damage and premature bearing failure. Learn how shaft grounding rings help protect motor bearings in industrial applications.
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