Elevator system

Details Elevator system Elevator system

1975-12-12

1977-09-06

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

040462293

ABSTRACT:
An elevator system which includes speed control apparatus which provides an error count representing the deviation of an elevator car from a desired speed versus distance reference pattern. Both the instantaneous and cumulative errors are indicated by the error count, and both are simultaneously corrected with digital precision by direct utilization of the error count. Anticipatory control of non-linear actuators responsive to the rate at which the cumulative error is corrected makes the system time optimal.

REFERENCES:
patent: 3589474 (1971-06-01), Waure
patent: 3590355 (1971-06-01), Davis et al.
patent: 3743055 (1973-07-01), Hoelscher et al.
patent: 3779346 (1973-12-01), Winkler
patent: 3906318 (1975-09-01), Kjellberg et al.

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