Speed-controlled direct-current motor with centrifugal switch

摘要

1,017,685. Automatic speed control. E. WEISS. May 20, 1964 [May 30, 1963], No. 20893/64. Heading G3R. [Also in Division H2] A constant speed D. C. motor has a permanent magnet rotor 2 cooperating with a star-connected stator winding having phases 16 supplied through transistor switches 15 which are operated in sequence when current is applied to their bases through the circuit including slip ring 3, centrifugal switch 4 and commutator 5. When the motor overspeeds the centrifugal switch opens and no current is supplied to the stator windings so the motor speed decreases. By suitable adjustment of the switch, constant speed can be obtained from the motor.