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Shaft Grounding Devices: An Economical Solution
Motor shaft voltages can pose a serious threat to the surrounding components of an electric motor. When the voltage on the motor shaft exceeds the insulation rating of nearby parts or cables, it can lead to both immediate and long-term damage to the motor bearings. This kind of electrical stress can significantly shorten the lifespan of critical machinery.
In some cases, high voltage can cause arcing between the motor shaft and the bearing. This arcing generates intense heat, which can melt metal and cause permanent pitting and wear on the bearing surfaces. Over time, this damage can lead to complete failure of the bearing, resulting in costly downtime and repairs.
Shaft voltage can develop due to several factors, including electrical leakage and electromagnetic induction. External influences such as friction from rubber belts against drive pulleys or other connected equipment can also contribute to the buildup of voltage on the motor shaft. Additionally, AC and DC motors equipped with variable frequency drives (VFDs) are particularly prone to generating induced currents on the shaft.
To prevent these harmful effects, shaft grounding devices are essential. These specialized components provide a safe and low-impedance path for electrical currents to follow, directing them away from the bearings and preventing damage. By doing so, they help protect the motor’s internal components and extend the life of the entire system.
Shaft grounding is crucial for maintaining the integrity of motor bearings and maximizing their service life. Without proper grounding, companies may find themselves spending more on frequent repairs and replacements. Grounding devices not only protect the bearings but also reduce the risk of expensive machinery failures.
Helwig Carbon shaft-mounted grounding devices are a cost-effective and reliable solution for protecting bearings from electrical discharge. They are especially beneficial for AC systems using VFDs and DC motors with PWM drives. These devices offer the lowest resistance path to ground, ensuring that harmful currents are quickly diverted away from sensitive components.
Available in a wide range of sizes, from 6mm (.2500â€) up to 225mm (9.000â€), Helwig Carbon grounding devices are suitable for both large and small motors. Their internal mounting design makes them ideal for use in various applications, including HVAC units, pump motors, fans, air-handling systems, compressors, elevators, data centers, chillers, and conveyors.
For environments where contamination is a concern, sealed options are available to enhance resistance and durability. This makes them well-suited for wash-down areas and other harsh conditions.
Investing in a shaft grounding device is a smart economic decision. It helps companies avoid costly repairs and maintenance by addressing potential issues before they escalate. Premature bearing failure is one of the leading causes of motor downtime, and grounding devices can significantly reduce this risk.
These grounding solutions are widely used across industries such as marine, manufacturing, industrial, and HVAC. They are known for their durability and ability to withstand tough operating conditions. Many models come in stock and are designed to fit most standard motor configurations, making installation and maintenance straightforward.
At Emerson Bearing, we recommend the use of shaft grounding devices in a variety of applications. If you're looking to improve the longevity and performance of your bearings, be sure to download our free eBook, *Increase Bearing Service Life and Optimize Performance*, today!
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