--- title: "Protect Your Electric Motor Bearings: The Key to Reliable Performance" description: Learn how AEGIS® Shaft Grounding Rings protect electric motor bearings from electrical discharge damage with complete 360-degree coverage. image: https://blog.est-aegis.com/hubfs/Imported_Blog_Media/eu-rings-big.jpg --- [![Electro Static Technology](https://blog.est-aegis.com/hubfs/raw_assets/public/public/images/electro-static-technology.svg "Electro Static Technology")](https://www.est-aegis.com/) [![Aegis](https://blog.est-aegis.com/hubfs/raw_assets/public/public/images/Aegis.svg "Aegis")](https://www.est-aegis.com/) - [+1 866-738-1857](tel:+1%20866-738-1857) - [Products](https://www.est-aegis.com/products/) - [AEGIS® SGR – for motors under 500 HP/375 kW](https://www.est-aegis.com/product/sgr/) - [AEGIS® uKIT – for common NEMA/IEC frame size](https://www.est-aegis.com/product/sgr-ukit/) - [AEGIS® RPPR – for reactor recirculating pumps](https://www.est-aegis.com/rppr-resources/) - [AEGIS® EV and EVO Rings - for electric vehicles](https://www.est-aegis.com/product/ev-evo-rings/) - [AEGIS® PRO Series – for motors over 300 HP/225 kW](https://www.est-aegis.com/product/pro-series/) - [Shaft Voltage Testing and Accessories](https://www.est-aegis.com/product/mounting-accessories/) - [Online Product Catalog](https://catalog.est-aegis.com/) - [AEGIS® 2-Year Extended Warranty](https://www.est-aegis.com/product/extended-warranty/) - [Applications](https://www.est-aegis.com/applications/) - [Electric Vehicle Solutions](https://www.est-aegis.com/applications/electric-vehicle-solutions/) - [Food & Beverage](https://www.est-aegis.com/applications/food-beverage/) - [HVAC](https://www.est-aegis.com/applications/hvac/) - [Industrial & Chemical](https://www.est-aegis.com/applications/industrial-chemical/) - [Other Industries](https://www.est-aegis.com/applications/other-industries/) - [Power Generation & Renewable Energy](https://www.est-aegis.com/applications/power-generation-renewable-energy/) - [Transportation](https://www.est-aegis.com/applications/transportation/) - [Water Treatment](https://www.est-aegis.com/applications/water-treatment/) - [Bearing Protection](https://www.est-aegis.com/bearing-protection/) - [Shaft Voltage & Bearing Currents](https://www.est-aegis.com/bearing-protection/shaft-voltage-and-bearing-currents/) - [Fluting & Bearing Inspection](https://www.est-aegis.com/bearing-protection/fluting-and-bearing-inspection/) - [Best Practices & Installation](https://www.est-aegis.com/bearing-protection/best-practices-and-installation/) - [Resources](https://www.est-aegis.com/resources/) - [AEGIS® Bearing Protection Handbook](https://www.est-aegis.com/resources/handbook/) - [IEEE-841, Hazardous Locations, & AEGIS®](https://info.est-aegis.com/technical-codes-and-ieee-841-standards) - [Recorded Webinars Library](https://www.est-aegis.com/resources/recorded-webinars/) - [Installation Instructions](https://www.est-aegis.com/resources/installation-instructions/) - [Videos](https://www.est-aegis.com/resources/videos/) - [Technical Papers](https://www.est-aegis.com/resources/technical-papers/) - [Case Studies](https://www.est-aegis.com/resources/case-studies/) - [Specifying AEGIS®](https://www.est-aegis.com/resources/specifying-aegis/) - [Request Training](https://www.est-aegis.com/resources/training/) - [Product Sheets](https://www.est-aegis.com/resources/product-sheets/) - [About](https://www.est-aegis.com/about/) - [News](https://blog.est-aegis.com/) - [Tradeshows](https://www.est-aegis.com/about/tradeshows/) - [Blog](https://blog.est-aegis.com/) - [Where to Buy](https://www.est-aegis.com/where-to-buy/) - [Distributors](https://www.est-aegis.com/where-to-buy/distributors?type=Distributor) - [Trained Installers](https://www.est-aegis.com/where-to-buy/installers?type=Installer) - [Explosion Proof Installers](https://www.est-aegis.com/where-to-buy/installers?type=Explosion%20Proof%20Installer) - [Motors & Seals with AEGIS® Installed](https://www.est-aegis.com/where-to-buy/oems-with-aegis/) [Contact Us](https://www.est-aegis.com/contact/) - [+1 866-738-1857](tel:+1%20866-738-1857) # Protect Your Electric Motor Bearings with Reliable Shaft Grounding [Home](https://www.est-aegis.com/) » [Blog](https://blog.est-aegis.com/) » Protect Your Electric Motor Bearings with Reliable Shaft Grounding [AEGIS](https://blog.est-aegis.com/author/estaegis) Jun 27, 2024 Are you concerned about damage to your electric motor bearings caused by electrical arcing? Understanding the [importance of shaft grounding](https://blog.est-aegis.com/shaft-grounding-devices-the-economical-solution?hsLang=en-us) can save you from costly downtime and repair/replacement. ## How Shaft Voltage Causes Bearing Damage Electric motors powered by variable-frequency drives (VFDs) are prone to shaft voltage. VFDs are known for enabling energy savings and precise motor control, but they induce high-frequency voltage on the motor shaft (across the bearings). When this voltage discharges through the bearings, it causes electrical discharge machining (EDM), leading to bearing damage and premature failure.![fluted1](https://blog.est-aegis.com/hs-fs/hubfs/Imported_Blog_Media/fluted1.jpg?width=300&height=204&name=fluted1.jpg) ## The Consequences of Bearing Failure When bearings fail, it can lead to catastrophic motor breakdowns, resulting in expensive unplanned downtime and repairs or replacements. The repercussions can be severe for applications relying on continuous operation, such as manufacturing, transportation, and HVAC and water treatment systems. Preventive measures are crucial to maintaining productivity. ## How Shaft Grounding Works Shaft grounding devices provide a path for harmful shaft voltage to discharge safely, preventing arcing through the bearings. These devices consist of conductive materials that divert discharge current away from the bearings. By providing a low-impedance path from the shaft to ground, they protect against EDM and help motor bearings reach their full lifespan. ## The Benefits of AEGIS® Shaft Grounding Rings![eu-rings-big](https://blog.est-aegis.com/hs-fs/hubfs/Imported_Blog_Media/eu-rings-big.jpg?width=300&height=206&name=eu-rings-big.jpg) [AEGIS® Shaft Grounding Rings](https://www.est-aegis.com/products/) are a proven solution for protecting electric motor bearings from electrical discharge damage. ### Complete 360-Degree Coverage Unlike most shaft grounding devices, which offer partial coverage, AEGIS® Rings provide complete 360-degree protection around the motor shaft. This ensures maximum effectiveness in diverting harmful current away from bearings. ### Versatility Across Applications AEGIS® Rings are used in many industries—from manufacturing to transportation—and across different applications such as HVAC systems, food processing machinery, water treatment equipment, and electric vehicles. ### Customizable Solutions AEGIS® Rings can be sized to fit almost any rotating equipment. From motors under 1 to thousands of HP,  generators, and turbines, we can make an AEGIS® Ring to fit your shaft. ## The Unique Advantage of Warranty Protection One key advantage of AEGIS® Shaft Grounding Rings is our comprehensive warranty protection. We offer a [2-year extended warranty](https://www.est-aegis.com/product/extended-warranty/) against bearing fluting on motors with AEGIS(R) rings installed according to our best practices. ## Ensuring Long-Term Motor Health with AEGIS® Shaft Grounding Rings Protecting VFD-driven motor bearings from electrical damage is crucial for maintaining operational efficiency. Reliable shaft grounding systems like AEGIS® Shaft Grounding Rings offer a proven solution, ensuring long-lasting protection against bearing failures caused by stray current. For more in-depth information on safeguarding your motors, [download our product sheet](https://www.est-aegis.com/wp-content/uploads/AEGIS-PRO-Brochure.pdf) or [Bearing Protection Handbook](https://www.est-aegis.com/resources/handbook/).   AEGIS rings also come with a [2-year extended warranty](https://www.est-aegis.com/product/extended-warranty/) against bearing fluting damage.  No other form of shaft grounding comes with a warranty like this. [![2-Year Extended Warranty](https://no-cache.hubspot.com/cta/default/20974229/3b258d08-3058-4c7f-a866-2991b627f2e0.png)](https://cta-redirect.hubspot.com/cta/redirect/20974229/3b258d08-3058-4c7f-a866-2991b627f2e0) To learn more about AEGIS shaft grounding and best practices for electrical bearing protection, [sign up for a training](https://www.est-aegis.com/resources/training/).  We offer monthly live training webinars, and we can also visit your facility to review your exact application. [![Sign Up For Training](https://no-cache.hubspot.com/cta/default/20974229/69dd56c7-bbd1-4ad0-ae5c-29de322039f0.png)](https://cta-redirect.hubspot.com/cta/redirect/20974229/69dd56c7-bbd1-4ad0-ae5c-29de322039f0) [Shaft Grounding Rings](https://blog.est-aegis.com/tag/shaft-grounding-rings), [Bearing Protection](https://blog.est-aegis.com/tag/bearing-protection) ### Subscribe To Our Blog ## Read On ### [Best Practices for Bearing Protection](https://blog.est-aegis.com/best-practices-bearing-protection?hsLang=en-us) In [**our last post**](https://blog.est-aegis.com/how-do-vfds-cause-bearing-damage?hsLang=en-us)**,** we described how VFDs cause electrical bearing damage. So, how do you protect... ### [How Do VFDs Cause Bearing Damage?](https://blog.est-aegis.com/how-do-vfds-cause-bearing-damage?hsLang=en-us) Electric induction motors were designed to be operated on 3-phase sine wave power. This input power... ### [Discovering and Preventing Bearing Current Damage](https://blog.est-aegis.com/discovering-and-preventing-bearing-current-damage?hsLang=en-us) Electric motors are prone to many sources of damage, some more common and some better known. An... 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