Speed setting and control system for universal motors

Details Speed setting and control system for universal motors Speed setting and control system for universal motors

1978-05-24

1979-06-19

Truhe, J. V.

Electricity: motive power systems

Alternating current commutating motors

Universal or a.c.-d.c. motors

318332, H02P 540

Patent

active

041587960

ABSTRACT:
A universal motor is energized by a speed setting circuit during one half wave and a speed control circuit during the next half wave of each cycle of an AC supply. The speed setting and speed control circuits each have a separate timing circuit including a capacitor. There is thus no residual charge on the capacitor of the speed setting circuit remaining from the operation of the speed control circuit during the preceding half wave. The residual charge prevented the setting of low motor speeds in the known systems. The speed control circuit includes a storage capacitor transformer coupled to the motor so that its initial charge corresponds to the current through the motor during the preceding half wave. The charge is transferred to a second capacitor. When the voltage across the second capacitor reaches a predetermined threshold valve, a switch in the speed control circuit becomes conductive and current flows through the motor.

REFERENCES:
patent: 3588647 (1971-06-01), Harwell
patent: 3818298 (1974-06-01), Eriksson
patent: 3875485 (1975-04-01), Hornung
patent: 4002959 (1977-01-01), Schadlich et al.
patent: 4039913 (1977-08-01), Clegg
patent: 4110671 (1978-08-01), Roger

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