Cyndi Nyberg
Former EASA Technical Support Specialist
Electric motors often use space heaters to prevent condensation inside the motor when it is not running. In damp areas, they may be necessary to prevent condensation from forming on the windings. They are also important for motors that are on “stand-by” equipment, or motors that are out of service for prolonged periods of time. The function of a space heater is to keep the winding temperature 5o to 10oC above the ambient temperature.
Another type of space heater is the silicone rubber space heater that is applied directly to the winding end turns. One advantage to this type is that they use less power to heat the windings, and they also remain cool to the touch. It is a good idea to insulate between the heater and the winding. It is possible, although rare, for a faulty heater to cause winding failure.
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