Elevator speed control system

Details Elevator speed control system Elevator speed control system

1977-02-07

1978-12-05

Schaffer, 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

041281420

ABSTRACT:
During the acceleration of an elevator car a command acceleration pattern in the form of frequency modulated clock pulses is counted by a first and a second counter. The first counter issues a command speed pattern. The speed pattern is integrated to calculate the distances of movement of the care which is successively stored in a random access memory at addresses determined by the speeds from the second counter, at equal increments of speed. During the deceleration the distances of movement succesively read out from the memory are compared with the residual distances to the stop floor and the second counter counts the results of the comparison down to produce an ideal speed curve. The curve supplied to the memory is also compared with the actual car speed to modify the command acceleration with the result that the actual speed follows up the ideal speed curve.

REFERENCES:
patent: 3743055 (1973-07-01), Hoelscher et al.
patent: 3777855 (1973-12-01), Boyldew et al.
patent: 3785463 (1974-01-01), Kuhl et al.
patent: 3893695 (1975-07-01), Rickert
patent: 3941214 (1976-03-01), Young et al.

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