Volsun Shaft Grounding Ring-Reliable Protection Way for VFD Motor Bearings

Volsun Shaft Grounding Rings are engineered to protect motor bearings from harmful shaft voltage and stray shaft currents generated by variable frequency drives (VFDs).

By providing a stable, low-impedance grounding path directly from the rotating shaft to ground, Volsun grounding rings prevent electrical discharge through bearings—significantly extending bearing life and improving overall motor reliability.

Designed for both OEM integration and retrofit applications, Volsun Shaft Grounding Rings deliver long-term performance in demanding industrial environments.

How It Works

In VFD-driven motors, high-frequency switching voltages induce electrical potential on the motor shaft. When this voltage discharges through bearings, it causes electrical erosion and premature failure.

Volsun Shaft Grounding Rings use 360-degree conductive fiber contact technology to continuously discharge shaft currents before they reach the bearings, ensuring safe and controlled grounding during operation.

Key Benefits

• Effective Shaft Voltage Dissipation

Safely diverts high-frequency shaft currents away from motor bearings.

• Ultra-Low Wear Contact Design

Conductive fibers provide stable electrical contact with minimal friction and shaft wear.

• Maintenance-Free Operation

Designed for long service life without frequent inspection or replacement.

• High-Speed Compatibility

Suitable for motors operating at high rotational speeds under VFD control.

• Flexible Installation

Available for new motor designs or field retrofit on existing equipment.

Typical Specifications (Customizable)

• Shaft grounding ring diameter: Customized to application

• Contact material: Conductive carbon fiber composite

• Operating speed: Suitable for high-speed motors

• Custom designs available based on motor size, application, and operating conditions.

Why Choose Volsun Shaft Grounding Rings

With over 20 years of expertise, Volsun delivers shaft grounding ring solutions that balance electrical performance, mechanical reliability, and real-world durability. We don’t just supply components—we engineer application-matched motor bearing protection solutions.

Shaft Grounding Ring – Frequently Asked Questions

• What is a shaft grounding ring used for?

A shaft grounding ring is used to safely discharge stray shaft currents generated in VFD-driven motors, preventing electrical damage to motor bearings.

• Why are VFD motors more prone to bearing damage?

VFDs generate high-frequency switching voltages that induce shaft voltage. When this voltage discharges through bearings, it causes electrical erosion such as pitting and fluting.

• Is a shaft grounding ring better than insulated bearings?

Insulated bearings can block current at one location, but they do not eliminate shaft voltage. Shaft grounding rings provide a controlled discharge path, making them a more direct and reliable solution.

• Where is a shaft grounding ring installed?

Shaft grounding rings are typically installed on the motor shaft or end bracket, maintaining continuous contact with the rotating shaft.

• Do shaft grounding rings wear out?

Volsun grounding rings use low-wear conductive fiber technology and are designed for long-term, maintenance-free operation under normal industrial conditions.

• Can Volsun provide custom shaft grounding rings?

Yes. Volsun offers customized designs based on shaft diameter, motor type, speed, environment, and installation constraints.

• Are shaft grounding rings suitable for retrofit applications?

Absolutely. Volsun Shaft Grounding Rings are widely used for upgrading existing motors already operating with VFDs.