Permanent-magnet excited DC motor for motor vehicle fan, has brushes connected to power supply terminals via separate switches, operated alternately by electronic controller

摘要

Separate switches (44a,b) are used to connect either individually or in common at least one brush (20) to the positive pole (3) of a DC power supply (30,32), and at least two further brushes (21,23) to the other pole, preferably earth. The separate switches are preferably similar in structure and operated alternately by an electronic controller (34). An Independent claim is included for a method of regulating the speed of a DC motor.