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 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.
What Causes VFD Bearing Failure?
VFDs improve motor control and efficiency, but shaft voltage and bearing currents can contribute to premature bearing failure. Learn the mechanisms, warning signs, and common mitigation approaches.
Why Shaft Grounding Ring is the Smarter Choice for VFD Motors
Learn why shaft grounding rings are a smarter solution for VFD motor bearing protection compared with traditional carbon brushes, especially in wind power, industrial motors, and variable frequency drive applications.
How to Install a Shaft Grounding Ring Correctly | VFD Motor Bearing Protection
Step-by-step installation guide for shaft grounding rings, covering shaft cleaning, fiber contact, grounding, continuity testing, and common installation mistakes.
Shaft Grounding Ring vs Carbon Brush: Which Is Better?
Compare shaft grounding rings and carbon brushes for VFD motor bearing protection, including maintenance, shaft wear, reliability, cleanliness, and long-term cost.
What Is Shaft Voltage and How to Prevent Bearing Damage in VFD Motors
VFDs improve control and efficiency, but their switching can induce shaft voltage that discharges through motor bearings. Learn the causes, warning signs, and how shaft grounding rings help.
Install an Arc-Shaped Shaft Grounding Ring
Installation checklist for arc-shaped shaft grounding rings where access and mounting envelope need review.
ST/STW vs RD/RDW: Which Shaft Grounding Ring Structure?
Compare arc-shaped ST/STW and solid RD/RDW shaft grounding rings by structure, mounting, and application fit.
What Causes Shaft Voltage in VFD Motors?
Foundational article on shaft voltage and bearing currents in inverter-fed motors.
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.
