Electrical currents passing through a bearing can lead to significant damage, manifesting as visible pits and grooves on its surface. These imperfections create an uneven texture, resulting in increased noise, vibration, and eventually complete failure. Such issues can be both costly and disruptive, often necessitating expensive repairs, maintenance, and unexpected downtime.
While not every bearing experiences damage due to electrical currents, certain scenarios tend to exacerbate the problem. Two common situations involve incorrect grounding of equipment or the use of bearings in AC/DC motors equipped with variable frequency drives (VFDs). In cases of improper grounding, the current tends to seek out the path of least resistance, frequently discharging through exposed bearings. With VFDs, voltage accumulates on the motor shaft and repeatedly discharges into the bearings, creating the fluting or pitting patterns that damage the equipment over time.
A practical solution to mitigate this issue is replacing standard bearings with ceramic hybrid bearings. These advanced bearings offer superior electrical and thermal insulation, effectively preventing current discharge. They are particularly well-suited for environments with VFDs or other grounded motors.
Ceramic hybrid ball bearings combine ceramic rolling elements with steel races, offering durability and insulation. For instance, Nachi ceramic hybrid ball bearings are among the most robust alternatives to traditional steel bearings. They maintain dimensional compatibility with most existing bearings, simplifying installation and reducing costs compared to other options.
Beyond their insulating properties, ceramic hybrid bearings bring numerous advantages, such as lightweight construction, safer operation under extreme conditions, and improved speed capabilities. Their low coefficient of friction enables faster rotation and higher power output while extending lifespan and reducing the risk of early failure. Additionally, they eliminate the need for heavy lubricants like oil or grease, minimizing contamination risks and decreasing environmental impact.
These benefits make ceramic hybrid bearings an excellent choice for applications requiring enhanced bearing protection, including food processing, HVAC units, compressors, conveyors, pump motors, elevators, refrigeration systems, fans, data centers, and generators.
At Emerson Bearing, we understand the importance of safeguarding your bearings against various threats. Our comprehensive eBook, *Increase Bearing Service Life and Optimize Performance*, delves into the key aspects of damage prevention. It explains how and why bearings fail and provides actionable steps to extend their service life. Download this resource today to enhance efficiency and protect your investments.
For further guidance on integrating our long-lasting bearing solutions into your facility, reach out to our dedicated team. We’re here to help ensure your operations run smoothly and efficiently.
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