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Overheating Electric Motors: One Root Cause of Insulation Failure

From Baker Instrument Company, an SKF Group Company
 

 
Modern Plant Management widely accepts predictive maintenance as a significant source of cost savings. However, preventive maintenance is still viewed as an alternative. This fact is based upon yesterday's technologies being unable to succeed at root cause analysis. With respect to the diagnostic electrical tool belt, the days of the handheld multi-meter and the meg-ohm meter as sole tools in cost effective maintenance is over. Modern on-line technologies permit easy assessment of the whole motor system, which is comprised of the power, motor and load. By focusing on the whole motor application instead of one or two components, true troubleshooting solutions become available. Maintenance experts agree that excessive heat causes rapid deterioration of the winding insulation within motors. The common rule states, for every 10oC of additional heat to the windings, the insulation life is cut in half. For example, a motor that would normally last 20 years in regular service is running 40oC above rated temperature. Under these conditions, the motor would have a life of 1/16 or about one year the length as it would have if it were running at rated temperature.
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Topics of Interest
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