After the motor has cooled, this moisture condenses within the porous winding insulation, as on the outside of a glass of ice water. When any warm dry motor is shut down, it draws in fresh cool air, which always contains some moisture even in hot dry weather. Motor winding insulation, unless it is of the fully encapsulated thermosetting-resin type, readily absorbs water from the air. ![]() The moisture causes deterioration of the winding insulation and corrosion of the metal parts.Ībsorption Of Moisture By Winding Insulation ![]() Motors in irrigation pumping plants of either the indoor or outdoor type are generally shut down during the winter months and are subject to condensation of moisture, especially in localities where the atmospheric conditions are severe.
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