Electrical power control unit for fan motor has polymer positive temperature coefficient overheating protection element in fan circuit and in cooling flow of medium produced by fan motor

摘要

The unit has an electrical resistance arrangement (R1-R3) connected into a fan motor (M) circuit and a polymer positive temperature coefficient or PPTC element (1) connected into the circuit as an overheating protection device. The PPTC element is arranged in the flow (S) of a medium produced by the fan motor and is cooled by the flow.