Technical Articles
Technical articles and application guides about shaft grounding rings, cold shrink tubes, insulation protection, and material solutions.
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.
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.
Shaft Grounding Ring vs. Carbon Brush: An Engineering Comparison for VFD Motors
Engineering comparison of conductive-fiber shaft grounding rings and carbon brush grounding for VFD motors, covering shaft current formation, contact mechanisms, application fit, and the operating data needed for selection.
How to Install a Shaft Grounding Ring Correctly: Five Critical Checks
A practical installation guide covering shaft preparation, conductive-fiber contact, ring alignment, frame grounding, common installation errors, and post-installation verification.
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.
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.
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.
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.
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 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.
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.
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.
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.
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