Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes control for power source of drive-means
Patent
1996-04-10
1998-01-27
Nappi, Robert
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes control for power source of drive-means
187289, 322 4, B66B 106
Patent
active
057124566
ABSTRACT:
An elevator system, having a three phase rectifier (20) which converts energy from a three phase AC main (21) to provide DC power on a bus (19) to a three phase inverter (18) that drives a three phase inductive hoist motor (17), utilizes regenerated energy applied (46, 47) to a boost regulator (52) to drive (54, 55) a flywheel motor generator (26) to store the regenerated energy in the form of inertia therein. When the flywheel motor generator reaches a limiting speed, any continued regenerated energy is dumped (59, 60) in an energy dissipating device (61). During periods of high demand, the inertial energy stored in the flywheel motor generator is utilized (67, 68) to add energy to the DC bus to provide additional current to the three phase inverter for driving the hoist motor. The control is provided by software embedded in an elevator computer (such as used for dispatching and motion control).
REFERENCES:
patent: Re32404 (1987-04-01), Ferris
patent: 3469657 (1969-09-01), Sgroi
patent: 4657117 (1987-04-01), Lauer
patent: 4787021 (1988-11-01), Hokari et al.
J.P. Barthelemy, Conference: Intelec 81, Third International Telecommunications Energy Conference, London England May, 19-21 1981.
P.A. Studer and H. E. Evans, Conference Proceedings of the 16th Intersociety Energy Conversion Engineering Conference. Technologies for the transition. Atlanta GA, Aug. 9-14 1981.
Bittar Joseph
McCarthy Richard C.
Nappi Robert
Otis Elevator Company
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