Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1983-02-17
1984-08-14
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318812, 318345H, H02P 540
Patent
active
044659571
ABSTRACT:
A method of controlling the speed of an alternating current motor is disclosed. A direct current reference signal, the magnitude of which is proportional to the speed of an electric motor, is coupled to one input of a voltage comparator. A control pulse is generated at the beginning of each half cycle of the alternating current source and utilized to periodically discharge a timing capacitor. The voltage present on the timing capacitor is applied to a second input of the voltage comparator and when the timing capacitor voltage equals or exceeds the direct current reference signal, power is applied to the motor.
REFERENCES:
patent: 3443188 (1969-05-01), Mortimer
patent: 3596158 (1971-07-01), Watrous
patent: 3604996 (1971-09-01), Lutz
patent: 3619656 (1971-11-01), Dombe
patent: 3739249 (1973-06-01), Rosenberry, Jr.
patent: 3821634 (1974-06-01), Sabolic
patent: 3859591 (1975-01-01), Saunders
patent: 3908158 (1975-09-01), Studtmann
patent: 4121141 (1978-10-01), Frazee
patent: 4190793 (1980-02-01), Parker et al.
patent: 4311956 (1982-01-01), Tolmie, Jr.
Buckley, R., "Speed Controller System for a D.C. Motor", Electrotechnology, Oct. 1978, vol. 6, No. 4, p. 133.
Ernst et al., "Current Zero-Crossing Detection for Thyristor Control", IBM Tech Bull., vol. 15, No. 3, Aug. 1972, p. 734.
Smith Jr. David
Teccor Electronics, Inc.
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