AC Elevator control system

Details AC Elevator control system AC Elevator control system

1982-08-25

1984-10-09

Weldon, Ulysses

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

318759, 318808, B66B 130

Patent

active

044756313

ABSTRACT:
An AC elevator control system which includes an inverter for inverting a DC voltage to an AC power having a variable voltage and a variable frequency under the control of a command voltage signal and a command frequency signal, and an induction motor which is driven with the AC power to operate an elevator car. With the induction motor operated in the regenerative braking mode, a switching device responds to the actual speed of the car exceeding its command speed to decrease the command frequency signal to such a magnitude that the induction motor has a slip equal to a predetermined one through a first gain regulator connected between a command speed generator and a command frequency generator. Simultaneously a second gain regulator is enabled to equal the command voltage signal to a difference between the actual and command speed signal.

REFERENCES:
patent: 3667016 (1972-05-01), Dunfield et al.
patent: 3688171 (1972-08-01), Salihi et al.
patent: 4314190 (1982-02-01), Walker et al.
patent: 4353023 (1982-10-01), Kawada et al.
patent: 4376471 (1983-03-01), Uchino et al.
patent: 4405886 (1983-09-01), Williamson
patent: 4417193 (1983-11-01), Hirata

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