Elevator speed control system

Details Elevator speed control system Elevator speed control system

1977-05-23

1978-12-19

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

B66B 130

Patent

active

041301846

ABSTRACT:
During the acceleration of an elevator car frequency modulated clock pulses are counted up by a first counter to generate a command speed pattern. A second counter similarly generates a second speed pattern identical in shape to and delayed a predetermined time relative to the command speed pattern. A randum access memory successively stores theoretical distances of movement of the car due to the command speed pattern suitably corrected and the second speed pattern as a distance-to-speed function. When and after both patterns first equal each other, a command deceleration pattern is generated to follow objectives or the distance-to-speed function. Once the command speed again equalled the objective, the intact distance-to-speed function is used as a command deceleration pattern concerning residual distances to a stop floor.

REFERENCES:
patent: 3552524 (1971-01-01), Benjamin et al.
patent: 3589474 (1971-06-01), Waure
patent: 3670851 (1972-06-01), Shima
patent: 3783974 (1974-01-01), Gilbert et al.
patent: 3887039 (1975-06-01), Boniek

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