Method for controlling elevator doors

Details Method for controlling elevator doors Method for controlling elevator doors

1994-04-14

1996-12-24

Wong, Peter S.

Elevator, industrial lift truck, or stationary lift for vehicle

With barrier for regulating access to load support

Includes motor or motor driven linkage for shifting barrier

187394, B66B 1314

Patent

active

055875653

ABSTRACT:
An apparatus for controlling an elevator door includes a three phase AC motor that receives control signals from a controller. The signals are issued at control points along a speed versus distance profile map that represents the control points as a percentage of the total distance to be travelled by the elevator. The total distance of door travel in one direction is measured be counting the number of pulses generated by an incremental encoder during a training run wherein the door is moved between its extreme positions at a constant speed. The number of pulses counted is then normalized to represent 100% of the distance traveled. During operation, the pulses are counted whenever the elevator door is in motion and control signals are issued based upon the number of pulses counted.

REFERENCES:
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patent: 4984660 (1991-01-01), Ikejima et al.
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patent: 5196656 (1993-03-01), Mizuno et al.
patent: 5274312 (1993-12-01), Gerstenkorn
patent: 5378861 (1995-01-01), Barten et al.
patent: 5389864 (1995-02-01), Tyran et al.

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