Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1985-08-29
1990-07-10
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
H02P 540
Patent
active
049409271
ABSTRACT:
A three-phase A-C speed controller for small integral and fractional horsepower motors includes a phase locked loop comprised principally of a phase comparator and voltage controlled oscillator to generate phase delayed trigger signals for energizing the windings of a three-phase A-C motor. A pair of shift registers are cascaded with a flip-flop to generate the 60.degree. phase delay between phases as is necessary in a three-phase system.
REFERENCES:
patent: 3344326 (1967-09-01), Risberg
patent: 3368133 (1968-02-01), Zenner
patent: 3467904 (1969-09-01), Studtmann et al.
patent: 3527990 (1970-09-01), Gasser
patent: 3560834 (1971-02-01), Studtmann
patent: 3577052 (1971-05-01), Bauer
patent: 3611089 (1971-10-01), Mokrytzki et al.
patent: 3621352 (1971-11-01), Dinger
patent: 3662247 (1972-05-01), Schieman
patent: 3665273 (1972-05-01), Enslin
patent: 3701001 (1972-10-01), Riess et al.
patent: 3704403 (1972-11-01), Gillett
patent: 3819992 (1974-06-01), Opal et al.
patent: 3864618 (1975-02-01), Hammond
patent: 3886430 (1975-05-01), Meier
patent: 4042862 (1977-08-01), Franklin
patent: 4146836 (1979-03-01), Zimmer
patent: 4211967 (1980-07-01), Akiyama et al.
patent: 4286203 (1981-08-01), Ehret
patent: 4295085 (1981-10-01), Lafuze
patent: 4348627 (1982-09-01), Fulton
patent: 4387329 (1983-06-01), Harlow
patent: 4409533 (1983-10-01), Kawabata
patent: 4409535 (1983-10-01), Hickman
patent: 4437051 (1984-03-01), Muto et al.
patent: 4441063 (1984-04-01), Roof et al.
patent: 4459533 (1984-07-01), Ehret et al.
patent: 4484129 (1984-11-01), Ono
patent: 4527109 (1985-07-01), Hosokawa et al.
Kenly et al, "Triac Speed Control of Three-Phase Induction Motor with Phase-Locked Loop Regulation", IEEE Transactions on Industry Applications, vol. IA, No. 5, Sep. 4, 1976, pp. 492-498.
Moffat et al, "Digital Phase-Locked Loop for Induction Motor Speed Control", IEEE Transactions on Industry Applications, vol. IA15, No. 2, Mar./Apr. 1979, pp. 176-182.
Century Electric, Inc.
Smith Jr. David
LandOfFree
Three-phase A-C speed control for variable torque motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Three-phase A-C speed control for variable torque motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Three-phase A-C speed control for variable torque motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1722713