Apparatus and method for controlling emergency operation in elev

Details Apparatus and method for controlling emergency operation in elev Apparatus and method for controlling emergency operation in elev

1997-11-03

1999-08-31

Nappi, Robert E.

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, 187393, B66B 128

Patent

active

059456442

ABSTRACT:
An apparatus and method for controlling an emergency operation in an elevator system. The apparatus includes an inverter for inverting a direct voltage into alternating voltages and driving an induction motor with the alternating voltages, a current detector for detecting a current that flows through a first coil of the induction motor, a speed detector for detecting a speed of the induction motor and outputting phase signals, and a control circuit for receiving the current outputted from the current detector and the phase signals outputted from the speed detector and outputting a voltage command to the inverter. The apparatus and method shorten a rescue time by determining an elevator car driving direction by the use of the phase signals outputted form the speed detector during a driving interruption caused by an abnormal or emergency situation.

REFERENCES:
patent: 4483419 (1984-11-01), Salihi et al.
patent: 5285029 (1994-02-01), Araki
patent: 5698823 (1997-12-01), Tanahashi
patent: 5796228 (1998-08-01), Kojima et al.

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