Control device for a multispeed motor

Electricity: motive power systems – Braking – Automatic and/or with time-delay means

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318328, 318618, H02P 706

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active

043863027

ABSTRACT:
A control device for multispeed motor having a first circuit for providing a detection signal whose period corresponds to a rotation speed of the motor, a trigger pulse generator connected to the first circuit for generating a trigger pulse corresponding to the detection signal, and a second circuit connected between the trigger pulse generator and the motor for providing a drive signal in accordance with the trigger pulse. The motor, first circuit, trigger pulse generator and second circuit form a closed negative feedback loop. The trigger pulse generator is characterized by a first trigger pulse generator for generating a first trigger pulse whose period corresponds to the period of the detection signal when the motor rotates with a first speed, a second trigger pulse generator for generating a second trigger pulse whose period corresponds to half the period of the first trigger pulse when the motor rotates with the first speed; and a selector connected to the first and second trigger pulse generators for selecting either said first or second trigger pulse and providing the selected trigger pulse as the trigger pulse.

REFERENCES:
patent: Re30684 (1981-07-01), Bullivant
patent: 3110853 (1963-11-01), Jones
patent: 3340951 (1967-09-01), Vitt
patent: 3843914 (1974-10-01), Carlson et al.
patent: 3898545 (1975-08-01), Coppa et al.
patent: 3952236 (1976-04-01), Hoover
patent: 4114075 (1978-09-01), Minakuchi
patent: 4218641 (1980-08-01), Arnold et al.
IBM Bulletin, vol. 14, No.2, Jul., 1971, pp. 388-389, Coburn et al.-Bidirectional PWM Motor Speed Control.

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