The automotive industry is racing toward 800V high-voltage architectures to achieve faster charging and higher efficiency. However, this leap in power comes with a hidden mechanical predator: High dv/dt (voltage change rate). As inverters switch faster to manage high voltages, they generate significant shaft voltages—often exceeding 100V—that can turn a high-performance EV motor into a ticking time bomb for bearing failure.

The 800V Bearing Challenge

In an 800V system, the dielectric strength of the bearing grease is constantly challenged. When voltage peaks, it creates an arc discharge (EDM) that "blasts" microscopic craters into bearing races. This leads to the infamous "fluting" noise and, eventually, total drivetrain failure. For EV manufacturers, this is a massive warranty and brand reputation risk.

The Volsun Shaft Grounding Ring Solution: Precision at 4mm

Volsun addresses this with the RDW Series (3rd Generation) Shaft Grounding Ring. Designed for space-constrained E-axles, it offers a revolutionary 4mm ultra-thin profile. This allows engineers to press-fit the ring into the housing without redesigning the shaft assembly.

Technical Edge: Metal-Coated Carbon Fiber (MCF) 

Unlike traditional brushes that create dust, Volsun uses proprietary Nickel-plated carbon fibers. This innovation ensures:

• Ultra-Low Resistance: Dynamic contact resistance of ≤10Ω throughout the motor's life.
• Thermal Resilience: Operating from -40°C to 150°C, essential for high-performance thermal cycling.
• Durability: Verified wear of <0.2mm per 300,000 km in oil-cooled environments.

Modular Innovation for Global Scale

Volsun 3rd Gen modular design utilizes laser-welding, reducing comprehensive costs by over 20%. This enables Tier-1 suppliers to maintain high reliability without sacrificing their competitive pricing edge.

FAQs:

Q1. How to protect 800V EV bearings? 

The most effective way is installing a low-impedance path like the Volsun RDW Ring to divert voltage before it arcs through the bearings.

Q2. What is the best grounding ring for EVs? 

A ring using Metal-Coated Carbon Fibers is best, offering low resistance (≤10Ω), extreme temperature tolerance, and a compact 4mm design.

Q3. Does the Volsun SGR work in oil-cooled motors? 

Yes. Some shaft grounding rings are specifically engineered for oil-chamber environments, showing superior wear resistance (<0.2mm per 300k km) compared to dry-run applications.

Q4. How is the Volsun 3rd Gen RDW installed? 

It supports two professional methods: Interference Fit (Press-fit) for high-stability motor assembly and Bolt-on Fixation for easy field retrofitting.

Q5. How does Volsun help reduce EV manufacturing costs? 

Our 3rd Gen modular laser-welded structure simplifies production and reduces components, leading to a 20%+ reduction in total cost while maintaining IATF 16949 standards.

• CONTACT TEL: +86-512-66386808
• SALES CONTACT: volsun2006@szvolsun.com