Reduction of voltage drop in power distribution systems and of l

Details Reduction of voltage drop in power distribution systems and of l Reduction of voltage drop in power distribution systems and of l

1981-07-15

1987-09-29

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318794, H02P 126

Patent

active

046971327

ABSTRACT:
Apparatus and method for reducing the voltage drop in an electrical power distribution system during the starting of a multi-phase induction motor having stator windings supplied therefrom and for decreasing the loss in starting torque of the motor. A capacitor is provided for direct connection across each stator phase winding of the motor. These are electrically connected to the stator windings substantially simultaneously with the motor being supplied with power from the distribution system. These capacitors have a capacitance which exceeds that required to raise the no-load power factor of the motor to unity at running speed but is less than that which will correct the power factor of the motor to unity under locked rotor conditions. Preferably these capacitors are electrolytic-type capacitors and have a capacitance which will reduce the motor starting current by at least approximately 30%. When the motor has substantially reached its running speed, the capacitors are substantially simultaneously disconnected from the respective stator windings.

REFERENCES:
patent: 3424971 (1969-01-01), Stackegard
patent: 4104687 (1978-08-01), Zulaski
Rose, A., "A Novel Approach for Thermo Mechanical Pulping (TMP) Refiner Motor Operation", Conference IEEE Conference Record of the 1979 Annual Pulp & Paper Industry Technical Conference, Pittsburgh, Pa., May 15-18, 1979.

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