VFD-driven motors | Bearing protection
Shaft Grounding Rings for VFD-Driven Motors
Volsun shaft grounding rings use metallized carbon fiber technology to provide a low-resistance path for shaft currents. By effectively diverting shaft currents away from bearings, they help reduce electrical pitting, fluting, and premature bearing failure, supporting long-term motor reliability.
Latest News
Company updates and exhibition highlights from Volsun.
- 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.
- Volsun at EASA 2026 Orlando
Volsun joined EASA 2026 in Orlando to discuss shaft grounding rings, VFD motor bearing protection, and practical reliability strategies with motor repair and OEM professionals.
Featured Technical Articles
Application guides on shaft voltage, VFD motor bearing protection, and shaft grounding ring installation.
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.
Oil-Cooled EV Motor Protection with VS-RDW Shaft Grounding
Oil-cooled traction motors improve thermal management, but immersion can disrupt shaft grounding contact. Learn how Volsun VS-RDW rings are engineered for reliable motor protection in EV oil-chamber applications.
What Causes VFD Bearing Failure? Electrical Erosion, Fluting, and Diagnosis
Repeated bearing replacement, abnormal noise, vibration, and fluting on VFD motors may point to electrical erosion—but lubrication and mechanical damage can look similar. Learn how to diagnose carefully, approach shaft-voltage checks, and decide when shaft grounding may help.
Featured Products
Core shaft grounding ring families for inverter-duty motors and custom retrofit programs.
VS-RD/RDW solid shaft grounding ring
Solid ring structure for smaller shaft diameters, with interference-fit or screw-fastened mounting reviewed by application.
VS-ST/STW arc-shaped shaft grounding ring
Arc-shaped ring structure for larger shaft diameters or access-constrained motors, typically reviewed for screw-fastened mounting.
Custom shaft grounding ring
Custom shaft grounding ring shapes and sizes reviewed from drawings, shaft geometry, and installation constraints.
Selection guide
Match the ring family to shaft access and diameter before RFQ.
- RD/RDW solid rings: strong default for smaller shaft diameters when the drive end is accessible for a one-piece install.
- ST/STW arc-shaped rings: suited to larger shaft diameters or when motor access makes a split install more practical.
- Custom: drawing-based reviews when envelope, groove, or contact position needs a non-catalog layout.
Why Choose Volsun Shaft Grounding Ring
Metallized carbon fiber contact
Core contact material is designed to provide a stable low-resistance path for shaft currents.
Oil-cooled EV motor compatibility
Suitable for oil-cooled EV motors and compatible with common transmission oil environments. The fiber structure maintains stable shaft contact under high-speed operation.
Design and customization support
Solid, arc-shaped, and custom structures can be reviewed according to shaft geometry and installation constraints.
Automated production and delivery support
Production capability and process control support repeatable delivery for application programs.
Testing and application review
Engineering review helps confirm fit, contact position, and documentation needs before quotation.
Broad application experience
Engineering teams align shaft grounding solutions with EV motors, industrial motors, pump systems, and wind power duty profiles.
Knowledge Center
Browse news, technical articles, and FAQs on shaft grounding ring applications and selection.
Documentation & next steps
Connect application context to downloads, Q&A, and RFQ.
Contact & RFQ
Request a quote or technical review—mention the motor application (pump, fan, traction, and so on), approximate shaft diameter, motor type or frame, and any known VFD brand or carrier-frequency range. All fields stay optional in the form; more detail usually speeds sizing. We typically respond within 24 hours.
