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Installation instructions for AEGIS shaft grounding rings

Download PDF FileApplication Notes for
Motors 100HP to 1000HP (75kW to 750kW)

Improve System Reliability and Production with Sustainable Motor Design

Large motors above 100 hp will have VFD induced EDM currents as well as high frequency circulating currents when they are controlled by VFDs. To protect the bearings, insulate the bearing on one end and install an AEGIS SGR™ on the other end.

Insulation on one end (usually NDE) and AEGIS SGR™ on opposite end
Larage Motor Drawing showing Aegis SGR on end

  • This method offers the most reliable protection
  • Motor frame must be well grounded
  • Non-Drive End: Bearing journal should be insulated or Insulated/ Ceramic Bearing installed to disrupt circulating currents
  • Install AEGIS SGR Bearing Protection Ring on opposite end of insulation and Insulated/Ceramic Bearing (usually DE)
  • Protects bearings in attached equipment (gear box, pillow block, encoder etc.)
* Recommend Colloidal Silver Shaft Coating PN CS015

If insulation is not possible, the next best protection is to install AEGIS SGR™ on both ends of the motor
Large Motor Drawing 2 without insulation

  • Motor frame must be well grounded
  • Install AEGIS SGR Bearing Protection Ring on drive and non-drive end to provide path of least resistance for circulating currents and to channel VFD currents to ground.
  • Protects bearings in attached equipment
  • NOT SUITABLE FOR CYLINDRICAL ROLLER BEARING
* Coat shaft with Colloidal Silver Shaft Coating

Critical Applications: Insulate both ends and add AEGIS SGR™ Bearing Protection Ring™
on both ends

Large Motor Drawing showing use for critical applications

  • Motor frame must be well grounded
  • Drive and Non-Drive end: Bearing journals should be insulated or Insulated/Ceramic Bearing installed to disrupt circulating currents
  • Install AEGIS SGR Bearing Protection Ring on drive and non-drive end to provide path of least resistance for shaft voltages and to channel VFD induced currents to ground.
  • AEGIS SGRTM required to protect bearings in attached equipment (gear box, pillow block, encoder, etc.)
* Coat shaft with Colloidal Silver Shaft Coating

Large Motors & Generators over 1000HP (750kW)
AEGIS iPRO Bearing Protection Ring
Rated for 120 amps/3000 Volts peak

AEGIS iProLarge motors and generators often have much higher induced shaft voltages and bearing currents which require a high current capable Bearing Protection Ring. High frequency circulating currents induced by variable frequency drives (VFD) will cause bearing fluting and catastrophic failure in these motors. Generators experience current surges which can cause electrical arcing in bearings and equipment.

  • One end of the motor should be insulated. Install AEGIS iPRO on opposite end of insulation to protect the non-insulated bearing.
  • Install AEGIS iPROon both ends of motor or generator if bearing cannot be insulated.
* Coat shaft with Colloidal Silver Shaft Coating

Purpose of Application Notes: Application notes are intended as general guidance to assist with proper application of AEGIS SGR™ Bearing Protection RingTM to protect motor bearings. All statements and technical information contained in the application notes are rendered in good faith. User must assume responsibility to determine suitability of the product for its intended use.

© 2010 Electro Static Technology, an ITW Company

 

 
Electro Static Aegis Electro Static Technology Inc.