Shaft voltages can pose significant risks to the surrounding components in electric motors. When the voltage surpasses the insulation capacity of nearby wires or parts, it can lead to both immediate and long-term harm to motor bearings. In some cases, extremely high voltages might even result in arcing between the shaft and the bearing. This phenomenon can rapidly heat up the bearing, causing metal to vaporize and suffer permanent damage or pitting.
The occurrence of shaft voltage can stem from several factors, such as leakage or induction. External influences, like rubber belts rubbing against drive pulleys or other coupled machinery, can also play a role. Additionally, AC and DC motors equipped with variable frequency drives (VFDs) often generate induced electrical currents on the motor shaft.
Thankfully, there are ways to counteract the currents caused by shaft voltage. Shaft grounding devices are specifically designed components aimed at reducing the potential for bearing damage when shaft voltage arises. These devices are crucial for safeguarding motor bearings and maximizing their lifespan.
The importance of using shaft grounding devices cannot be overstated. Without proper grounding, companies face additional costs related to repairs and replacements due to premature bearing failure. Shaft grounding devices act as a protective shield, channeling harmful shaft currents away from sensitive areas and preventing voltage buildup over time on the rotor. This straightforward yet effective technology significantly reduces the risk of accidents or costly property damage.
Helwig Carbon offers highly economical solutions for protecting bearings from electrical discharges. Systems utilizing AC with VFD control or DC with PWM drives particularly benefit from this added layer of security. Helwig's shaft-mounted grounding devices provide the shortest path to ground for electrical discharge and swiftly redirect currents away from critical bearings.
These grounding devices are renowned for their outstanding bearing protection and reliability in preventing failures. Available in various sizes suitable for both large and small motors, they cater to a wide range of applications, including 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, and sealed options enhance resistance in harsh environments like those requiring frequent wash-downs.
Choosing to install a shaft grounding device represents a wise financial decision. Proactive measures like these help avoid expensive repairs and maintenance issues while ensuring continuous operation. Industries such as marine, manufacturing, industrial, and HVAC frequently adopt these devices because they typically outlast the equipment they protect. Stock kits are readily available and compatible with most standard motors, offering flexibility in shaft size options. Installation and maintenance are straightforward, and internal mounting capabilities further enhance their practicality.
For organizations seeking to extend the service life of their bearings, grounding devices stand as the optimal choice. They represent the best technological approach to minimize shaft voltage. Preventing hazardous currents is vital for preserving property integrity and ensuring safety.
At Emerson Bearing, we advocate the implementation of shaft grounding devices across many sectors. If you're interested in learning more about extending bearing service life through grounding devices, consider downloading our free eBook, *Increase Bearing Service Life and Optimize Performance*, today!
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