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Shaft Grounding Devices: An Economical Solution
Shaft voltages in electric motors can pose significant risks to surrounding components. When the voltage surpasses the insulation limits of nearby cables or parts, it can inflict both immediate and long-term harm on motor bearings. In some cases, high voltages can even trigger arcing between the shaft and the bearing, which rapidly raises the bearing's temperature. This extreme heat can vaporize metal, leaving permanent damage and pits on the bearing surface.
Shaft voltage can arise due to several factors, often linked to leakage or induction. External influences, such as rubber belts generating friction against drive pulleys or coupled machines in proximity, can also increase the likelihood of shaft voltage. Additionally, AC and DC motors equipped with variable frequency drives (VFDs) frequently generate induced electrical currents on the motor shaft.
Thankfully, there are ways to counteract the currents caused by shaft voltage. Specialized shaft grounding devices are designed to help protect motor bearings in situations where voltage spikes occur. These devices effectively channel harmful currents away from sensitive areas, reducing the risk of damage to valuable machinery.
The importance of implementing shaft grounding devices cannot be overstated. Proper grounding ensures that motor bearings remain protected and function optimally throughout their lifespan. Without addressing shaft voltage, companies face unnecessary expenses related to frequent repairs and replacements. Shaft grounding devices act as a safeguard by diverting harmful currents away from critical bearings, thereby preventing costly failures.
Grounding provides a low-resistance pathway for shaft voltage to flow through. This setup channels current away from bearings and prevents voltage buildup over time on the rotor. This straightforward yet effective technology significantly diminishes the chances of accidents or property damage.
Helwig Carbon offers shaft-mounted grounding devices that represent the most cost-effective method for shielding bearings from electrical discharge. Systems utilizing AC with VFD control and DC with PWM drives particularly benefit from this added layer of protection. These grounding devices create the shortest path to ground for discharging electricity and swiftly redirect currents away from vital bearings.
Helwig Carbon’s shaft-mounted grounding devices provide outstanding bearing protection and prevent failures. Available in various sizes suitable for both large and small motors, they come with internal mounting options and are ideal for diverse applications such as HVAC units, pump motors, fans, air-handling systems, compressors, elevators, data centers, chillers, and conveyors. Shafts ranging from 6mm (.2500 inches) to 225mm (9.000 inches) are offered, with sealed variants enhancing resistance in harsh environments like wash-down settings.
Investing in shaft grounding devices represents a wise financial move for businesses. Proactive measures like these help avoid expensive repairs and maintenance costs while minimizing downtime caused by premature component failure. Grounding devices are widely used across multiple industries, including marine, manufacturing, industrial, and HVAC sectors. Known for their durability and adaptability to tough conditions, these devices are readily available in stock kits compatible with most standard motors and multiple shaft sizes. They are also user-friendly to install and maintain.
For those interested in extending bearing service life through the installation of shaft grounding devices, Emerson Bearing encourages exploring our free eBook titled "Increase Bearing Service Life and Optimize Performance." Download it today to gain deeper insights into enhancing your equipment's reliability and efficiency.