Method and apparatus providing minimal power consumption, indica

Details Method and apparatus providing minimal power consumption, indica Method and apparatus providing minimal power consumption, indica

1993-02-17

1995-05-02

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Power-factor control

318798, 318800, 318806, 318438, H02P 124

Patent

active

054123038

ABSTRACT:
A power control circuit for induction motors wherein a servo loop is used to control power input by controlling the minimal power consumption of motor operation. The minimum power consumption is measured by sensing current or power and operating the servo loop at or near a minimally sensed power consumption level. The negative derivative of power consumption vs voltage curve, dP/dV, is sensed and a minimal value is used in a servo loop's error summing point wherein compensating slightly drives the power consumption point past the minimal power consumption point to regulate minimal power consumption by a smooth, minimal cycle. Maximum energy savings is thus attained with a smooth, stepless regulating method placing no mechanical stress on the motor-and-load combination. An indicator of power savings and normal operation is inherent in this type of control system which provides for a device for both indicating the level of savings and alerting of system faults. A circuit timer may be included to provide intermittent operation of refrigeration/air conditioning units to provide additional energy savings for these systems.

REFERENCES:
patent: 4413217 (1983-11-01), Green et al.
patent: 4454462 (1984-06-01), Spann
patent: 4680525 (1987-07-01), Kobari et al.
patent: 4727305 (1988-02-01), Muskovac et al.
patent: 4800326 (1989-11-01), Unsworth
patent: 5148093 (1992-09-01), Bando et al.

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