Exposing a bearing to an electric current can lead to serious electrical bearing damage. This type of damage typically appears as small pits or grooves on the bearing’s surface, which create an uneven texture. Over time, this can result in increased noise, vibration, and ultimately complete failure of the component. Such issues can be expensive, often leading to unexpected downtime and costly repairs or replacements.
While not every bearing is affected by electrical currents, and not all circuits cause damage, two common scenarios usually lead to this problem: improper grounding of equipment and the use of bearings in AC/DC motors equipped with variable frequency drives (VFDs).
When a machine is not properly grounded, the electrical current may take the path of least resistance—often through the bearings. In the case of VFDs, voltage can build up on the motor shaft and repeatedly discharge into the bearings. This repeated discharge causes fluting or pitting patterns inside the bearing, which can eventually lead to malfunction and failure.
One effective solution to prevent electrical bearing damage is to use ceramic hybrid bearings. These bearings are designed with ceramic rolling elements and steel races, offering superior insulation properties that prevent current from passing through. They are especially useful in environments with VFDs or other systems where grounding issues may occur.
What Are Ceramic Hybrid Ball Bearings?
Ceramic hybrid ball bearings feature ceramic balls paired with steel inner and outer rings. This combination makes them highly resistant to electrical damage, as the ceramic material provides excellent insulation. Unlike traditional bearings, they reduce the risk of electric arcing and fluting, ensuring smoother operation. These bearings also come with double shielding and non-conductive properties, making them ideal for high-speed and high-temperature applications.
Nachi ceramic hybrid bearings, for example, are known for their durability and compatibility with standard bearing sizes. This means they can be easily installed without requiring major modifications, making them a cost-effective alternative to conventional steel bearings.
Additional Benefits of Ceramic Hybrid Ball Bearings
Beyond their electrical insulation, ceramic hybrid bearings offer several other advantages:
- **Lightweight**: Their ceramic components make them lighter than traditional bearings.
- **Safer in extreme conditions**: They perform well under harsh environments.
- **Wider speed range**: They can handle higher speeds more efficiently.
- **Low friction**: This allows for faster rotation and better power output.
- **Longer lifespan**: They are less prone to premature failure, offering better long-term value.
- **Reduced lubrication needs**: They require less oil or grease, lowering maintenance costs and environmental impact.
These benefits make ceramic hybrid bearings a great choice for industries such as food processing, packaging, HVAC systems, compressors, conveyors, and more.
Safeguard Your Bearings With Emerson Bearing
Bearings can be damaged by various factors, including electrical currents, temperature fluctuations, and mechanical stress. Understanding these risks is essential to preventing costly failures and downtime.
Our eBook, *Increase Bearing Service Life and Optimize Performance*, provides valuable insights into how to protect your bearings and extend their lifespan. It covers the main causes of damage, how to identify early signs, and practical steps to improve performance.
To learn how to maximize efficiency and protect your equipment, download the eBook today. For more information on integrating durable bearing solutions into your facility, contact our team now.
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