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Shaft Grounding Devices: An Economical Solution
Electrical discharges caused by high shaft voltages can wreak havoc on motor bearings and surrounding components. When the voltage surpasses the insulation threshold of nearby parts, it can result in both short-term and long-term damage to the bearings. In some cases, this voltage can even trigger arcing between the shaft and the bearing. The intense heat generated by such arcing can cause metal to vaporize, leaving permanent damage and pits on the bearing's surface.
Shaft voltage typically arises due to leakage or induction. External factors like rubber belts rubbing against drive pulleys or other coupled machinery can exacerbate this issue. AC motors with variable frequency drives (VFD) and DC motors equipped with pulse width modulation (PWM) drives frequently experience induced electrical currents on the shaft.
Thankfully, there are ways to mitigate these risks. Shaft grounding devices are specifically engineered to protect motor bearings from the adverse effects of shaft voltage. These devices create a safe pathway for electrical currents to flow, steering them away from vulnerable bearings and reducing the risk of damage.
It’s crucial to understand the importance of implementing shaft grounding solutions. By doing so, companies can avoid unnecessary downtime and costly repairs. These devices act as a safeguard for your bearings, ensuring they remain functional and extend their operational lifespan. A grounding system provides a low-resistance route for current to follow, preventing voltage from accumulating on the rotor and causing harm over time.
Helwig Carbon offers a range of shaft-mounted grounding devices that are cost-effective and highly efficient. Systems using AC with VFD control and DC with PWM drives particularly benefit from this added layer of protection. These grounding devices offer the shortest path to ground, swiftly diverting currents away from critical areas. Available in various sizes, they cater to both large and small motors and come with internal mounting options. Applications include HVAC units, pump motors, fans, air-handling systems, compressors, elevators, data centers, chillers, and conveyors. Shafts ranging from 6mm (.2500") to 225mm (9.000") are supported, with sealed versions offering enhanced durability in harsh environments.
Investing in a shaft grounding device is not just a wise financial move but also a proactive step toward maintaining operational efficiency. Industries such as marine, manufacturing, industrial, and HVAC rely heavily on these devices to minimize downtime and maintenance costs. Grounding devices are known for their durability and adaptability to tough conditions. Stock kits are readily available and compatible with most standard motors, making installation and upkeep straightforward.
For those interested in extending bearing service life, consider downloading our free eBook, *Increase Bearing Service Life and Optimize Performance*. At Emerson Bearing, we are committed to helping businesses enhance their equipment's reliability and efficiency. Protecting your assets is key to ensuring safety and longevity in any operation.