BEST PRACTICES FOR Protecting Large Motors and Generators

from Damaging Bearing Currentswith AEGIS® iPRO Rings

iPROBEARING PROTECTION RING

Problem: VFD-Induced Shaft Voltages and Circulating CurrentsWhen not properly mitigated, VFD-induced shaft voltages and circulating currents in large motors and generators, including

Low-voltage motors: 500 HP or greater Medium-voltage motors DC motors: 300 HP or greater

cause electrical damage in bearings, resulting in motor failure and downtime.

Solution: Install an AEGIS® Ringon the motor shaft’s drive end...Installing an AEGIS® iPRO Ring on the motor‘s drive end will provide a path of least resistance, channeling damaging VFD-induced currents away from bearings and safely to ground. Apply AEGIS® Colloidal Silver Coating to the shaft (where the ring’s microfibers will make contact) to improve conductivity and prevent oxidation.

Electrical discharge machining — pitting and frosting

Fluting damage to bearing race — a washboard pattern from electrical discharges

© 2014 Electro Static Technology

...and insulate the shaft’s non-drive end

AEGIS® iPRO: Designed and Built for Maximum Bearing Protection and Long Life

The AEGIS® iPRO is a larger, beefier version of the AEGIS®

Bearing Protection Ring with the greater current-carrying capacity required for larger motors and generators. Through revolutionary AEGIS® Nanogap Technology,

it ensures effective electrical contact whether in physical contact with the motor shaft or not. Maintenance-free, it provides superior bearing protection for the normal service life of the motor’s bearings.

6 rows of conductive microfibers provide greater current-carrying capacity for larger motors

Specially engineered microfibers flex without breaking, protect bearings for the life of motor

Patented FiberLock™ Channel secures fibers and protects them from contamination

ShaftShaft

AEGIS® Ring

FiberLock™ Channel

SlimLineAEGIS® iPRO Rings

The AEGIS® iPRO has six rows of specially engineered conductive microfibers that encircle the motor shaft and ensure continuous electrical contact whether they are physically touching the shaft or merely in nanogap proximity to it. Containing hundreds of thousands to millions of microfibers, these rows provide the high current-carrying capacity required for large motors.

Through their patented design, AEGIS’s proprietary conductive microfibers are designed to flex without breaking. They exhibit only minimal wear and last for the bearing life of the motor. In testing, they were proven to withstand 2 million direction reversals and over 200,000 hours of continuous operation (to 1800 RPM) with no fiber fatigue or breakage.

AEGIS’s patented, protective FiberLock™ channel locks the ring’s conductive microfibers securely in place around the motor shaft, allowing them to flex without breaking. The channel also helps protect fibers from excessive dirt, oil, grease, and other contaminants.

To interrupt the path of high-frequency circulating currents (common in large motors), install insulated bearings or sleeves on the non-drive end of the motor shaft.

For vertical pump motors, insulate the bearing carrier.

EMQ-Insulated Sleeves

HYBRID CERAMIC BEARINGS

COATED BEARINGS

INSULATED CARRIERS

INSULATED SLEEVES

Insulated Carrier Service

Non conductive rolling element made of silicone nitride

Insulates the bearing against the passage of currents

Provides extended grease life

Lower operating temperatures

Available with shields and seals

Available from stock size range from 6203 thru 6332

These bearings have electrical insulating coatings to protect against damage caused by the passage of electrical currents.

Available from stock size range from 6212 thru 6332

SKF INSOCOAT INSUTECT

FAG INSUTECT

NKE Electrically Insulated Roller Bearings

Manufactured in SAE 1026 Steel

Coated with a Thermoplastic Polymer Alloy

Dielectric strength of 1,000 volts per mil.

Supplied with insulating washers made from G10 material.

Available from stock size range from 6202 thru 6240

• Documented Tolerances • Ground Finish • Carriers are inspected for radial & axial run out • 50 Rockwell C Hardness • Electrical Integrity Test Standard 1 GΩ at 1033V • This Technology Can Be Applied to Any OEM Carrier • Fast Turnaround Time

EMQ-Insulated Sleeves

HYBRID CERAMIC BEARINGS

COATED BEARINGS

INSULATED CARRIERS

INSULATED SLEEVES

Insulated Carrier Service

Non conductive rolling element made of silicone nitride

Insulates the bearing against the passage of currents

Provides extended grease life

Lower operating temperatures

Available with shields and seals

Available from stock size range from 6203 thru 6332

These bearings have electrical insulating coatings to protect against damage caused by the passage of electrical currents.

Available from stock size range from 6212 thru 6332

SKF INSOCOAT INSUTECT

FAG INSUTECT

NKE Electrically Insulated Roller Bearings

Manufactured in SAE 1026 Steel

Coated with a Thermoplastic Polymer Alloy

Dielectric strength of 1,000 volts per mil.

Supplied with insulating washers made from G10 material.

Available from stock size range from 6202 thru 6240

• Documented Tolerances • Ground Finish • Carriers are inspected for radial & axial run out • 50 Rockwell C Hardness • Electrical Integrity Test Standard 1 GΩ at 1033V • This Technology Can Be Applied to Any OEM Carrier • Fast Turnaround Time

Hybrid Ceramic Bearings

Insulated Carriers

Insulated Sleeves

Coated Bearings

BEARING PROTECTION RING

iPRO Rings are available in a range of styles…

and Mounting Options

You Provide Motor Dimensions, We’ll Provide a Quote

AEGIS® iPRO Solid Ring AEGIS® iPRO Split Rings

All AEGIS® iPRO Rings are

custom-manufactured to the

measurements you provide.

So, in order to provide an

accurate quote, we must have

precise motor measurements.

iPRO Rings cannot be

returned due to errors

in these measurements.

If you have any questions,

please contact

AEGIS® Customer Service:

NEMA ‘U’shaftdiameter

Stepdiameter

Distance from mounting faceto end of shaft step

Mounting faceouter diameter

Mounting faceinner diameter

Distance from mountingface to end of shaft

Distance from mountingface to shaft key

Distance from mounting faceto attached equipment

Measure dimensions to: Inches: 3 decimal places / Metric: 2 decimal places

Bearing Cap MountingCustom Brackets Mounting Plate

207-998-5140sales @ est-aegis.comwww.est-aegis.com

Form 701-1/10-2014

1-866-738-1857