Energy saving motor speed controller

Details Energy saving motor speed controller Energy saving motor speed controller

1980-04-30

1984-04-17

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318803, H02P 540

Patent

active

044437501

ABSTRACT:
A variable speed motor controller for an AC motor, said controller including a DC to AC converter for providing adjustable frequency AC signals to vary the speed of said motor, and a sensing device and energy saving control for detecting the magnitude of the current signal being supplied to the motor and adjusting the AC voltage to the motor depending upon the magnitude of the current signal. The smaller the motor current being sensed, the smaller the voltage applied to the motor, thereby effecting a saving of energy. Energy is saved using this controller because when the lesser motor current indicates that it is driving less than full load, the input voltage applied to the motor is reduced thereby effecting a power saving.

REFERENCES:
patent: 3515971 (1970-06-01), Joslyn et al.
patent: 3748556 (1973-07-01), Gillett
patent: 3860858 (1975-01-01), Nola
patent: 3983463 (1976-09-01), Nabae et al.
patent: 4158163 (1979-06-01), Eriksen
Phillips, K. P. "Current-Source Converter for AC Motor Drives" Transactions on Industry Applications, IA-8, No. 6 Nov./Dec. 1972.
Elsenhaure et al. "A High Efficiency Controlled Slip Induction Motor Drive for Electric Vehicles," Proceedings of the 14th Intersociety Energy Conversing Engineering Conference, Boston, MA., Aug. 5-10, 1977.

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