Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1981-09-09
1983-08-23
Truhe, J. V.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
B66B 502
Patent
active
043998925
ABSTRACT:
The disclosed elevator control systems comprises a three-phase AC source and an emergency three-phase AC generator supplying selectively an AC power to a thyristor Leonard type converter connected to a hoist DC motor for driving an elevator car, and a firing control circuit formed of a microcomputer. With the converter connected to the AC source, the microcomputer calculates a firing signal from a command and an actual speed signal for the hoist motor, and an input current to the converter according to a firing program stored in it and delivers the firing signal to the converter to control its firing in the symmetric mode. Upon a suspension of the AC power, a power failure detecting relay drops out to connect the converter to the emergency generator, decrease the command speed signal and cause the microcomputer to calculate similarly a firing signal but by using the decreased command speed signal and another firing program stored in it. The firing of the converter is controlled in the unsymmetric mode according to that firing signal.
REFERENCES:
patent: 3610371 (1971-10-01), Abbott
patent: 3658156 (1972-04-01), Abbott
patent: 4220222 (1980-09-01), Kamaike et al.
patent: 4316097 (1982-02-01), Reynolds
Duncanson Jr. W. E.
Mitsubishi Denki & Kabushiki Kaisha
Truhe J. V.
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