--- title: Rugged and Reliable Vertical Motors for Inverter-Duty Applications description: Rugged and Reliable Vertical Motors for Inverter-Duty Applications image: https://blog.est-aegis.com/hubfs/Imported_Blog_Media/vertical-motors.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) # Rugged and Reliable Vertical Motors for Inverter-Duty Applications [Home](https://www.est-aegis.com/) » [Blog](https://blog.est-aegis.com/) » Rugged and Reliable Vertical Motors for Inverter-Duty Applications [AEGIS](https://blog.est-aegis.com/author/estaegis) Sep 23, 2016 Vertical motors run on variable frequency drives are susceptible to electrical bearing damage and premature failure.  When any motor, vertical or horizontal, is run on an inverter, the drive's output causes a capacitive voltage on the motor shaft that can discharge through the bearings, causing electrical damage and premature failure.  This has brought grief to more than one water treatment plant; you can [read one of their stories here.](https://www.est-aegis.com/wp-content/uploads/AEGIS_CaseStudy_WaterTreatment.pdf)   GE Power Conversion is aware of this problem, so they offer their [Ultra™ Vertical Pump Motors](https://www.est-aegis.com/oem/GE/Ultra_Vertical_Pump_Motor.pdf) with an [AEGIS® Shaft Grounding Ring](https://www.est-aegis.com/product/sgr/) as an option.  AEGIS® shaft grounding gives VFD-produced shaft voltages a low-impedance path to ground, drawing damaging current away from the bearings, and so protecting them against electrical damage. ![vertical-motors](https://blog.est-aegis.com/hs-fs/hubfs/Imported_Blog_Media/vertical-motors.jpg?width=399&height=441&name=vertical-motors.jpg) For more on GE Ultra™ Vertical Pump Motors, [see this brochure](https://www.est-aegis.com/oem/GE/Ultra_Vertical_Pump_Motor.pdf).  To learn how AEGIS® shaft grounding helped with a Kansas treatment facility's chronic bearing failure problem, read this [case study](https://www.est-aegis.com/wp-content/uploads/AEGIS_CaseStudy_WaterTreatment.pdf).  And for fuller background on electrical bearing damage due to VFDs, see the [AEGIS® Bearing Protection Handbook](https://www.est-aegis.com/resources/handbook/). [VFD Bearing Damage](https://blog.est-aegis.com/tag/vfd-bearing-damage), [Variable Frequency Drive](https://blog.est-aegis.com/tag/variable-frequency-drive), [Shaft Grounding](https://blog.est-aegis.com/tag/shaft-grounding), [Vertical Motors](https://blog.est-aegis.com/tag/vertical-motors) ### Subscribe To Our Blog ## Read On ### [If You Sell Drives, It's Smart to Recommend Motors with Shaft Grounding](https://blog.est-aegis.com/if-you-sell-drives-its-smart-to-recommend-motors-with-shaft-grounding?hsLang=en-us) Variable frequency drive users look to drive manufacturers and reps not only for quality products... ### [How To: Bearing Protection Handbook Details Best Practices For Motor Protection and Repair](https://blog.est-aegis.com/how-to-bearing-protection-handbook-details-best-practices-for-motor-repairs?hsLang=en-us) This 56-page technical handbook describes best practices for protecting motor bearings from... ### [5 Great Ways to Lower Risk for New Construction](https://blog.est-aegis.com/shaft-grounding-specification-on-the-rise-for-vfd-fed-systems?hsLang=en-us) ### As reported in Construct Connect Blog of June 1, 2018, U.S. Construction Spending Hit an All-Time... 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