Exposing a bearing to an electric current can lead to serious damage, often resulting in pitting, grooves, and uneven surfaces that increase noise, vibration, and eventually complete failure. This kind of damage can be costly, causing unnecessary downtime and expensive repairs or replacements. While not all bearings are affected by electrical currents, and not every circuit causes damage, two common scenarios typically lead to this issue: improper grounding and the use of bearings in motors with variable frequency drives (VFDs).
When equipment is not grounded correctly, stray currents may find their way through the bearings, which act as a path to the ground. In VFD applications, voltage can accumulate on the motor shaft and repeatedly discharge into the bearings. This repeated discharge creates fluting or pitting patterns, which ultimately lead to malfunction and reduced performance.
A reliable solution to prevent such damage is to replace standard bearings with ceramic hybrid bearings. These bearings combine the strength of steel with the insulating properties of ceramic materials. This design helps block electrical current from passing through the bearing, making them ideal for high-voltage environments like those found with VFDs or other grounded systems.
Ceramic hybrid ball bearings feature ceramic rolling elements and steel inner and outer races. Their unique construction offers excellent insulation, preventing electric arcing and fluting. They also include double sealing, non-conductive characteristics, and maintain low temperatures even under extreme conditions.
For example, Nachi ceramic hybrid bearings are highly durable and compatible with most standard bearings, allowing for easy replacement without modifications. This makes them a cost-effective and efficient upgrade option.
In addition to their electrical insulation, ceramic hybrid bearings offer several other advantages:
- Lightweight design
- Safer operation in harsh environments
- Enhanced speed capabilities
- Low friction for faster rotation and higher power output
- Extended lifespan and reduced risk of early failure
- Elimination of heavy lubricants like oil or grease, reducing contamination and environmental impact
These benefits make ceramic hybrid bearings a top choice for industries where bearing protection is crucial, including food processing, packaging, HVAC systems, compressors, conveyors, pumps, elevators, and data centers.
Protecting your bearings from electrical damage is essential to maintaining efficiency and minimizing downtime. At Emerson Bearing, we specialize in long-lasting solutions that help you safeguard your equipment. Our eBook, *Increase Bearing Service Life and Optimize Performance*, provides valuable insights into preventing damage, understanding failure causes, and extending the life of your critical components.
Download the eBook today and take the first step toward maximizing efficiency and protecting your investment. If you'd like to learn more about how our bearing solutions can benefit your facility, contact our team now.
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