Elevator speed control system

Details Elevator speed control system Elevator speed control system

1976-08-17

1978-02-07

Schaefer, Robert K.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

318203R, B66B 130

Patent

active

040722120

ABSTRACT:
The disclosed elevator speed control system accelerates an induction motor for an elevator car in accordance with a voltage dependent upon a differential signal between a command speed signal and the actual speed signal and passed through a saturation generator. The saturation generator issues a command for applying across the motor its rated voltage upon the closure of a normally open contact set disposed in it. The system includes a sensor circuit is responsive to the difference signal less than a predetermined magnitude to decrease an output from the saturation generator. Alternatively the sensor circuit may responds to a negative load on the motor exceeding a predetermined magnitude to decrease the output from the saturation generator.

REFERENCES:
patent: 3688874 (1972-09-01), Lusti et al.
patent: 3876918 (1975-04-01), Komuro et al.
patent: 3941214 (1976-03-01), Young et al.
patent: 3973175 (1976-08-01), Anzai et al.

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