Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1983-04-20
1985-10-22
Shoop, Jr., William M.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
318741, 318744, 318757, 318759, 307 64, 307 66, B66B 500, H02J 904
Patent
active
045482993
ABSTRACT:
An AC elevator control system has a converter for converting a three-phase AC power to a direct current, an inverter for inverting the direct current to a three-phase AC power with a variable voltage at a variable frequency, and a three-phase induction motor for receiving the last-mentioned AC power to operate an elevator car connected to a counterweight through a traction rope trained over a sheave. A battery connected across the DC side of the inverter is enabled upon the occurrence of a power failure or a fault. A command emergency frequency generator responds to the occurrence of an emergency such as a power failure to deliver to the inverter a low frequency emergency frequency as determined by the relationship between a difference in weight between the elevator car and the counterweight and various losses of a motor driving system so as to cause the induction motor not to generate regenerative power.
REFERENCES:
patent: 3863123 (1975-01-01), Godard
patent: 3902573 (1975-09-01), Grove
patent: 3916279 (1975-10-01), Kawano et al.
patent: 4122516 (1978-10-01), Tokunaga
patent: 4376471 (1983-03-01), Uchino et al.
"Spotlight Report", by Mitsubishi Electric Advance, Japan (vol. 14, Dec. 1980).
Mitsubishi Denki & Kabushiki Kaisha
Paul Shik Luen
Shoop Jr. William M.
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