--- title: If Your Motor Is On a VFD, Squealing May Be Electrical Fluting Damage description: If Your Motor Is On a VFD, That Squealing May Be Electrical Fluting Damage. image: https://blog.est-aegis.com/hubfs/Imported_Blog_Media/Let-us-be-your-partner-e1518125580869-Dec-22-2021-03-25-30-04-PM.png --- [![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) # If Your Motor Is On a VFD, Squealing May Be Electrical Fluting Damage [Home](https://www.est-aegis.com/) » [Blog](https://blog.est-aegis.com/) » If Your Motor Is On a VFD, Squealing May Be Electrical Fluting Damage [AEGIS](https://blog.est-aegis.com/author/estaegis) May 14, 2018 **Shaft Voltage from VFDs Damages Bearings** - watch the video to see the shaft voltage that causes pitting in the motor's bearings and eventual fluting and failure. ### PROBLEM: Motor with No Bearing Protection... **Variable frequency drives (VFDs)** on AC and DC motors create harmful electrical voltages on the motor shaft. If these voltages build up high enough, they discharge through the motor's bearings, causing fusion craters, severe pitting, and fluting. Excessive bearing noise and eventually bearing failure is the result. ### SOLUTION: Motor with AEGIS Shaft Grounding Ring The [**AEGIS® Shaft Grounding Ring**](https://www.est-aegis.com/product/sgr/) prevents electrical bearing damage by giving a path of least resistance to harmful shaft voltage, so they discharge through the ring, instead of through the bearings. The AEGIS Ring's conductive microfibers™ provide the most reliable and long-lived current diversion of any shaft grounding system. For more information, download or request a print copy of the [AEGIS Bearing Protection Handbook](https://www.est-aegis.com/resources/handbook/) of best practices for bearing protection. [Shaft Grounding Rings](https://blog.est-aegis.com/tag/shaft-grounding-rings), [Shaft Voltage](https://blog.est-aegis.com/tag/shaft-voltage), [Video](https://blog.est-aegis.com/tag/video), [Motors on VFD](https://blog.est-aegis.com/tag/motors), [Motors with AEGIS Installed](https://blog.est-aegis.com/tag/motors-with-aegis-installed) ### Subscribe To Our Blog ## Read On ### [Is Shaft Voltage Destroying Your Bearings?](https://blog.est-aegis.com/is-shaft-voltage-destroying-your-bearings?hsLang=en-us) Variable frequency drives (VFDs) enable precise speed control and significant energy savings, but... ### [WEG Cooling Tower Motors Are Available with AEGIS Installed](https://blog.est-aegis.com/weg-cooling-tower-motors-are-available-with-aegis-installed?hsLang=en-us) Severe duty is standard with [WEG W22 motors](https://www.weg.net/catalog/weg/US/en/Electric-Motors/AC-Motors---NEMA/General-Purpose-ODP-TEFC/TEFC-Cast-Iron/W22/c/MT_3PHASE_LV_TEFC_W22_CI). There are not many environments more severe than... ### [Shaft Grounding is Key in Sustainable Building](https://blog.est-aegis.com/shaft-grounding-key-sustainable-building?hsLang=en-us) AEGIS Rings have worked for years to improve reliability and sustainable operatuion of HVAC and... 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