Elevator control system to land car at floor during abnormal con

Details Elevator control system to land car at floor during abnormal con Elevator control system to land car at floor during abnormal con

1995-08-18

1997-11-11

Nappi, Robert

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes control for power source of drive-means

187293, 187394, B66B 140, B66B 128, B66B 134

Patent

active

056867077

ABSTRACT:
Whenever the elevator cage (2) enters a landing zone at each target stop floor, the landing zone calculator (32) generates discriminate signals (32b, 32c, 32d) indicative of whether the cage lands from a normal distance or from one of abnormal distances (far away or not far away from the normal distance) detected by limit switches (27 to 30). Then, the landing pattern generator (34) calculates a landing pattern representative of the reference speed proportional to a distance from the current position to the target stop position of the motor shaft on the basis of the output of the landing zone calculator (32) and the detected motor shaft position. Therefore, whenever the moving cage enters the landing zone, the cage is controlled in such a way that the cage speed can be reduced gradually with the approach of the motor shaft angular position to a target stop angular position thereof.

REFERENCES:
patent: 4245721 (1981-01-01), Masel
patent: 4356896 (1982-11-01), Tamura et al.
patent: 4515247 (1985-05-01), Caputo
patent: 4520904 (1985-06-01), Rado et al.
patent: 4658935 (1987-04-01), Holland
patent: 4674604 (1987-06-01), Williams
patent: 4738337 (1988-04-01), Caputo
patent: 4844205 (1989-07-01), Klingbeil
patent: 4898263 (1990-02-01), Manske et al.

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