Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1989-10-16
1991-05-07
Ro, Bentsu
Electricity: motive power systems
Induction motor systems
Primary circuit control
318812, 318822, H02P 7622
Patent
active
050139908
ABSTRACT:
An energy conserving device which reduces excess level of alternating current power fed to RUN windings of an a.c. electric induction motor whenever the motor is less than fully loaded. A voltage dropping reactor coupled between an a.c. power source and the motor produces about 10-30% reduction in applied motor terminal voltage under reduced motor load running conditions, while a semiconductor switch acts to instantly shunt out the voltage dropping effect of the reactor and couple an increased portion, or full level of a.c. terminal voltage to the motor whenever the motor load increases. Changes in instantaneous levels of motor loading may be determined by changes in motor speed slip, determined from the motor's operating power factor, or preprogrammed. As a result of less a.c. power being applied to the motor under all but full-load conditions, a considerable reduction in eddy current and winding resistance losses is obtained which may save 20% or more in electrical energy usage in refrigerators, air conditioners, and other major appliances and as a result considerably lessen power demand from utility lines.
REFERENCES:
patent: 3166702 (1965-01-01), Horsley
patent: 3657622 (1972-04-01), Reuland et al.
patent: 4052648 (1977-10-01), Nola
patent: 4266177 (1981-05-01), Nola
patent: 4288737 (1981-09-01), McClain et al.
patent: 4533857 (1985-08-01), Chang et al.
patent: 4727305 (1988-02-01), Muskovac et al.
patent: 4806838 (1989-02-01), Weber
patent: 4823067 (1989-04-01), Weber
Magazine: "Record May for Majors", Appliance Manufacturer, Aug. 1989, p. 8 (newsitem).
Magazine: Arthur Fisher, "Saving the Planet", Popular Science, Oct. 1989, pp. 51-56 (particularly p. 53).
LandOfFree
Energy conserving electric motor power control method and appara does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Energy conserving electric motor power control method and appara, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Energy conserving electric motor power control method and appara will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-941723