Three-phase motor control

Details Three-phase motor control Three-phase motor control

1992-04-10

1994-04-05

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318771, 318749, H02P 126

Patent

active

053008707

ABSTRACT:
A three-phase induction motor is driven efficiently from a single-phase power supply by reconnecting the motor windings and using two or more capacitors to provide balanced currents and voltages in the windings at preselected values of power. A similar method is used to drive a three-terminal conventional motor from a single-phase supply by using a tapped autotransformer with two different voltages and two different capacitors to excite the third motor terminal. Capacitor switching in all embodiments is controlled by feedback from the voltage across the winding with capacitor excitation.

REFERENCES:
patent: 2593987 (1951-06-01), Courtney
patent: 3036255 (1962-05-01), Lewus
patent: 3835356 (1974-09-01), Soderholm
patent: 4464756 (1949-03-01), Trickey
patent: 4484125 (1984-11-01), Hertz
patent: 4642545 (1987-02-01), Lewus
patent: 4792740 (1988-12-01), Smith

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