One of the causes of premature electric motor and insulation failure is contamination. A key, often overlooked, part of any electric motor maintenance program is to ensure the motor is clean.
Air passages, fan, and surfaces of the motor should be cleaned periodically. Contamination build up on these surfaces will reduce the electric motor’s ability to cool itself, resulting in shorter insulation life.
The area around the motor shaft should be kept clean to reduce the chance for contamination incursion into the bearings as well. Monitoring the electrical insulation condition with motor circuit analysis will allow of early detection of winding contamination build up within the electric motor on the windings.