초록 ▼

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 a

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.

대표청구항 ▼

Energy conserving means comprising: source of alternating current power; induction motor means coupled with the a.c. power source; means for producing a reactive voltage drop between the source and the motor means; means for producing substantially inconstant mechanical loading of the motor means; m

Energy conserving means comprising: source of alternating current power; induction motor means coupled with the a.c. power source; means for producing a reactive voltage drop between the source and the motor means; means for producing substantially inconstant mechanical loading of the motor means; means for determining the motor loading produced by the mechanical load producing means; and, means for reducing the reactive voltage drop in response to a determined increase in motor loading above a predetermined level.