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.
Main Products
Choose the family that matches how you build or maintain the motor.
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
What Causes Shaft Voltage in VFD Motors?
Foundational article on shaft voltage and bearing currents in inverter-fed motors.
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.
Install an Arc-Shaped Shaft Grounding Ring
Installation checklist for arc-shaped shaft grounding rings where access and mounting envelope need review.
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.
