Peak power limiter system for excavator

Details Peak power limiter system for excavator Peak power limiter system for excavator

1980-07-18

1982-11-09

Weldon, Ulysses

Electricity: motive power systems

With flywheel or massive rotary member

318150, H02K 702

Patent

active

043587194

ABSTRACT:
A motor drive system for a mining shovel includes three a.c. motors which are driven by associated inverter circuits that receive power from a common d.c. bus. The d.c. bus connects to the a.c. power lines through a rectifier circuit and large variations in power occur during various portions of the digging cycle. To limit the peak power demanded during a digging cycle a peak power limiter system comprised of a fourth inverter driven a.c. motor is attached to the d.c. bus. This a.c. motor drives a flywheel which is operated to store energy during periods of low power demand and which is operated to regenerate stored energy to the d.c. bus when power demanded from the a.c. power lines exceeds a preset amount.

REFERENCES:
patent: 1048985 (1912-12-01), Marburg
patent: 1132478 (1915-03-01), Johnson
patent: 1476978 (1923-12-01), Jeffrey
patent: 1493968 (1924-05-01), Davis
patent: 3667012 (1972-05-01), Kilgore
patent: 4001666 (1977-01-01), Grenfell
patent: 4263535 (1981-04-01), Jones

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