--- title: Nidec Unimount Motors with AEGIS description: U.S. Motors general purpose Unimount motors include several protective features, including AEGIS Shaft Grounding Rings for NEMA frame sizes over 140. image: https://blog.est-aegis.com/hubfs/Imported_Blog_Media/unimount-300x228.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) # Nidec Unimount Motors with AEGIS [Home](https://www.est-aegis.com/) » [Blog](https://blog.est-aegis.com/) » Nidec Unimount Motors with AEGIS [AEGIS](https://blog.est-aegis.com/author/estaegis) Jul 20, 2020 Nidec's [U.S. Motors](https://acim.nidec.com/motors/usmotors/) is one of the oldest and most respected brands of electric motor.  They may be best known for their specialty motors, like [vertical HOLLOSHAFT®](https://acim.nidec.com/motors/usmotors/-/media/usmotors/documents/literature/datasheets/product-data-sheets/pds_corro-duty-vhs-inverter-duty-stock-models.ashx), [Vari-Tough®](https://www.est-aegis.com/oem/USMotors/VariTough_with_AEGIS.pdf) condenser motors, and the severe duty [World Motor®](https://acim.nidec.com/motors/usmotors/-/media/usmotors/documents/catalogs/fl600/inv-tefc-world-hostile-20-1vt.ashx) family. But U.S. Motors also makes general purpose motors, like their [Unimount® line](https://www.est-aegis.com/where-to-buy/oems-with-aegis/). ![unimount](https://blog.est-aegis.com/hs-fs/hubfs/Imported_Blog_Media/unimount.jpg?width=275&height=209&name=unimount.jpg)Unimount motors come with a wide range of electrical and mechanical features.  They can power pumps, fans, and compressors, by belt or direct drive, or direct connection.  And they are well-protected against external and internal sources of damage.  They come with a Class F Inverter Grade® insulation system to protect against winding damage from VFD power. Their bearings are well-protected, too.  Unimount motors from 56 to 140 frame have sealed bearings, and from 180 up, they have double shielded bearings.  This protects the bearings from contamination from outside.  And now, all Inverter Duty Unimount motors over 140 frame are protected against electrical damage by an [AEGIS® Shaft Grounding Ring](https://www.est-aegis.com/products/). A VFD creates voltage on the motor shaft.  This voltage can discharge by arcing through the bearings, causing electrical beairng damage.  AEGIS Rings create a low-resistance path from the motor shaft to the frame.  So rather than building up and then arcing through the bearings, charge drains harmlessly through the ring. With protection against both external and internal sources of damage, the bearings in Inverter Duty Unimount motors are highly unlikely to fail prematurely.  Bearing failure is the largest single cause of motor failure.  So that means you can expect a Unimount motor to run reliably for years and years.   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 protection against VFD-caused bearing damage 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 - pandemic restrictions permitting - 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)   [Motors on VFD](https://blog.est-aegis.com/tag/motors) ### Subscribe To Our Blog ## Read On ### [6 More Things You Need To Know About Shaft Grounding](https://blog.est-aegis.com/7-more-things-you-need-to-know-about-shaft-grounding?hsLang=en-us) Even More Questions and Answers from the Plant Services Webinar, "Motors & Drives: VFDs and Motors... ### [Five Reasons You Should Use Motors with AEGIS Shaft Grounding Factory-Installed Inside](https://blog.est-aegis.com/five-reasons-for-aegis-inside?hsLang=en-us) **1. Motors run on variable frequency drives (VFDs) need protection against bearing current ** ### [U.S. Motors Inverter Duty World Motors Now Have AEGIS Inside](https://blog.est-aegis.com/u-s-motors-inverter-duty-world-motors-now-have-aegis-inside?hsLang=en-us) U.S. Motors' World Motor® line of severe duty motors includes some of the toughest motors out... 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