Our Product
A Global Solution
With the advent of more and more VFDs becoming used globally, what is the most effective and economical solution?
The answer is motor grounding rings. – These rings consist of very thin micro-fiber that redirects shaft currents and provides a reliable, very low- impedance path from shaft to frame, which bypasses the motor bearings entirely. The motor grounding ring is attached to the electric motors bearing housings.
Once installed, the motor grounding rings require no maintenance. Unlike conventional shaft grounding brushes, its conductive microfibers work with virtually no friction or wear. They are unaffected by dirt, grease, or other contaminants, and last for the life of the motor, regardless of motor speed.
During changes in load conditions and during adjustments to their drive parameters it was found that many motors exhibited increased shaft currents after their most recent repair. This is why it is termed "The Ghost", since it can never be determined when its effects will drastically increase and rapidly destroy bearings. It is of utmost importance that industry protects itself against this so called "Ghost", especially in regard to their critical motors.
Unique Benefits of Motor Grounding Rings Products
What separates Motor Grounding Rings (Pty) Ltd from our competitors:
Get the correct life-span out of your electric motor
Electric motor bearings are expected to last on average 50 000 hours, but bearings on VFD driven motor applications are only lasting on average 17 800 hours. Electric motors that have MGR™ attached are proven to get as much as 300 to 400% more life-span than motors without MGR™.
Benefits Of Installing MGR™
Motors last 3x longer. Our 5 year research and development project shows this startling result, and is therefore no surprise why most overseas companies and motor manufacturers are installing earth rings as standard on their electric motors. Increase Motor Life with a 33% reduction in breakdowns is a significant saving in any budget.
Statistics Show:
• 90% Of motors on drives fail due to bearings.
• 60% Of reduced bearing life is due to shaft voltages.
• 100% Of motor manufacturers specify shaft grounding on drive motors.
Insulated bearings are not required for low voltage motors thereby saving servicing costs, as well as no waiting for availability of insulated bearings or housings, and above all; MGR™ can be used for the "Lifetime of the motor".
5 Main Benefits Of MGR™
1. Increases life of all electric motors on variable speed drives.
2. No insulated bearings or housings required.
3. Also protects driven equipment, fans, gearboxes etc.
4. Lasts for the "Lifetime of the motor".
5. Lifetime warranty covers both bearings on an electric motor.
Before Installing MGR™
A 150 HP Motor with a shaft brush & no insulated bearing fitted, has reduced shaft voltage to only 2,8v Pk-Pk
After Installing MGR™
A 150 HP Motor was tested on a VFD Drive, shaft currents were 12v Pk-Pk