--- title: Maximizing Electric Motor Performance with AEGIS® PRO Series description: AEGIS® PRO Rings provide 360-degree protection for large motors, offering high current capacity. Learn how these rings prevent electrical bearing damage and enhance system reliability in various industrial settings. image: https://blog.est-aegis.com/hubfs/Imported_Blog_Media/AEGIS-PRO-ring-collection-300x200.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) # Maximizing Performance with AEGIS® PRO Series [Home](https://www.est-aegis.com/) » [Blog](https://blog.est-aegis.com/) » Maximizing Performance with AEGIS® PRO Series [AEGIS](https://blog.est-aegis.com/author/estaegis) May 23, 2024 Bearing protection plays a crucial role in the longevity of electric motors, generators, and turbines. One innovative solution is the [AEGIS® PRO Series Shaft Grounding Ring.](https://www.est-aegis.com/product/pro-series/) These rings safely discharge harmful shaft voltage in large-frame/low- and medium-voltage electric motors, generators, and turbines. ## Understanding the Problem: Shaft Voltage and Bearing Damage ![PRO Product Group V-2](https://blog.est-aegis.com/hs-fs/hubfs/PRO%20Product%20Group%20V-2.jpg?width=300&height=218&name=PRO%20Product%20Group%20V-2.jpg)Electric motors operated by variable frequency drives (VFDs) are prone to developing shaft voltage. This voltage can discharge through the bearings, creating microscopic pits on the bearing surfaces.  Over time, this pitting can cause bearing fluting and premature failure, incurring repair costs and even more expensive unplanned downtime.  Some form of electrical bearing protection is necessary. ## The Role of AEGIS® PRO Rings AEGIS® PRO Shaft Grounding Rings effectively solve this problem. They protect the motor bearings from electrical bearing damage by offering an alternate low-impedance path for shaft voltage to safely discharge to the ground. Key features of the AEGIS® PRO Series include: - **Comprehensive Coverage**: Unlike other products that offer partial shaft coverage, AEGIS® grounding rings provide complete 360-degree protection. - **High Current Capacity**: Made with six circumferential rows of conductive microfibers, these rings withstand the high shaft current that VFDs produce in large motors. - **Wide Range of Sizes**: AEGIS(R) PRO Rings can be fit to shaft sizes from 2.5” (63.5 mm) to well over 30” (762 mm).  Larger shafts can be accommodated by “segmenting” the PRO rings, as is often done in wind turbine generators. - **American-Made Quality**: All AEGIS(R) rings are proudly manufactured in Mechanic Falls, Maine, in compliance with ISO-9001. ## Manufacturing & Industrial Settings [AEGIS® PRO Rings](https://www.est-aegis.com/product/pro-series/) are used wherever large motors are controlled by VFDs.  Common areas of application include: - [Steel mills](https://www.est-aegis.com/applications/industrial-chemical/) - [Pulp and paper mills](https://www.est-aegis.com/applications/industrial-chemical/) - [Cement plants](https://www.est-aegis.com/applications/industrial-chemical/) - [Power generation plants](https://www.est-aegis.com/applications/power-generation-renewable-energy/) - [Water treatment plants](https://www.est-aegis.com/applications/water-treatment/) ## Why Choose AEGIS® PRO Rings Maximizing performance and ensuring the longevity of your electric motors, generators, and turbines is crucial for operational efficiency. The [AEGIS® PRO Ring](https://www.est-aegis.com/product/pro-series/) offers a robust solution to mitigate electrical bearing damage, reduce maintenance costs, and enhance system reliability. If you want to learn more about how AEGIS® PRO Rings can protect your equipment and improve performance, please [contact us](https://www.est-aegis.com/contact/). Our team is ready to provide you with all the information and support you need to make an informed decision.   One advantage of AEGIS Shaft Grounding Rings is their [2-year extended warranty](https://www.est-aegis.com/product/extended-warranty/) against bearing fluting damage.  No other form of shaft grounding offers 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) [AEGIS PRO Rings](https://blog.est-aegis.com/tag/aegis-pro-rings) ### Subscribe To Our Blog ## Read On ### [WEG Explosion Proof Motors Now Offer an AEGIS Option](https://blog.est-aegis.com/weg-explosion-proof-motors-now-offer-an-aegis-option?hsLang=en-us) In less than sixty years, WEG Electric has grown from being a local Brazilian motor manufacturer to... ### [TECO-Westinghouse Motors with AEGIS Shaft Grounding](https://blog.est-aegis.com/teco-westinghouse-motors-with-aegis-shaft-grounding?hsLang=en-us) Westinghouse Electric is one of the best-known and longest-lived brands in the world. Westinghouse... ### [High Proof Shaft Grounding: AEGIS Rings in an Ethanol Plant](https://blog.est-aegis.com/aegis-rings-in-ethanol-plant?hsLang=en-us) In early 2017, at [Red Trail Energy's ethanol plant](https://www.redtrailenergyllc.com/) in North Dakota, several large motors' ball... 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