Power factor controller

Details Power factor controller Power factor controller

1980-07-07

1983-06-14

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Power-factor control

318778, H02P 540

Patent

active

043885780

ABSTRACT:
A power factor controller for an AC induction motor which controls the input power to the motor commensurate with the loading on the motor so as to improve efficiency. The circuit provides a signal representative of the phase difference between the current through the motor and the voltage across it. The phase difference varies with motor loading and accordingly is utilized to control the input power to the motor. The improvement in efficiency is displayed in terms of the percent savings provided by the controller. The circuit provides an immediate response to initial energization of the motor to enable the motor to reach full speed in minimum time.

REFERENCES:
patent: 3525916 (1970-08-01), Chodash
patent: 4052648 (1977-10-01), Nola
patent: 4063146 (1977-12-01), Oliver
patent: 4176307 (1979-11-01), Parker
patent: 4190793 (1980-02-01), Parker et al.
patent: 4249120 (1981-03-01), Earle
patent: 4266177 (1981-05-01), Nola
"Power Factor Controller", Brief No. MFS-23280, NASA Technology Utilization Office, Mar. 79.
"Energy Savings in an Induction Motor Using the 8022 Microcontroller", ITEL, Application Note AP-94, May 1980.
Marshall Space Flight Center, "Fast Response Power Saver for Induction Motors", NASA Tech. Briefs, Spring-1979.

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