System with delay timer for motor load equalization

Details System with delay timer for motor load equalization System with delay timer for motor load equalization

1991-11-19

1993-05-11

Wysocki, Jonathan

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Load control

318432, 318 63, H02P 700

Patent

active

052104737

ABSTRACT:
The invention is an improvement in an AC adjustable frequency load-moving system of the type having a control circuit providing a motor speed signal and using command ramps to control each of plural AC squirrel cage motors. The invention helps assure substantially equal load sharing by the motors. The improvement includes a dwell circuit which maintains the motor speed reference signal at a synchronizing value at least for a period of time denominated as the dwell time. This permits microprocessors--which may be running asynchronously--to both "read" the same value of motor speed signal even though such value may be read at slightly different instants. Separate inverter units monitor such signal and responsively generate synchronized command ramps to effect load sharing. The invention is suitable for use with a wide variety of plural-motor drive systems and has been found to be particularly suitable for use on crane hoist systems.

REFERENCES:
patent: 3845366 (1974-10-01), Metzler et al.
patent: 4166238 (1979-08-01), Binner
patent: 4267493 (1981-05-01), Roof
patent: 4408281 (1983-10-01), Tack, Jr. et al.
patent: 4658971 (1987-04-01), Kornely
patent: 4765456 (1988-08-01), Bower
patent: 5077508 (1991-12-01), Wycoff et al.
patent: 5086964 (1992-02-01), Blaser

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