Abstract :
In oil refining and petrochemical industries, more and more electric motors are being used for various drives such as pumps, compressors, cooling fans, etc. In order for the electric motors to be competitive with other drives, such as turbines, diesel engines, etc., high reliability of the electric motors must be maintained. Directly heating the motor winding with a low voltage system when it is not in operation, coupled with automatic control, will increase its reliability and extend its service life.
