H - Electricity – 02 – P
Patent
H - Electricity
02
P
H02P 5/46 (2006.01) B66B 1/30 (2006.01) B66C 13/26 (2006.01) H02P 5/74 (2006.01)
Patent
CA 2060472
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.
Harnischfeger Corporation
Ridout & Maybee Llp
LandOfFree
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