Circuit and method for controlling speed of an alternating curre

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

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Circuit and method for controlling speed of an alternating curre does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit and method for controlling speed of an alternating curre, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit and method for controlling speed of an alternating curre will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-116024

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.