Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1990-07-13
1991-09-24
Pellinen, A.D.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187119, B66B 130
Patent
active
050507095
ABSTRACT:
An elevator control apparatus which compensates for an insufficient gain of the entire control system caused by a drop in power source voltage or the like includes an electric power control circuit for controlling electric power for feeding to an electric motor which drives the car of an elevator, a speed command generating circuit for generating a speed command signal of the car, a speed detecting circuit for detecting the speed of the car, a computing circuit for calculating the deviation between a speed detecting signal obtained by the speed detecting device and a speed command signal generated by the speed command generating circuit, a compensating circuit for outputting an electric power command signal in which gain properties and phase properties have been compensated in accordance with the deviation calculated by the computing circuit, a comparing circuit for determining whether or not the deviation calculated by the computing circuit exceeds a first specified value, and a damping gain setting circuit for, when the comparing circuit determines that the deviation exceeds the first specified value, adding a correction value which is based on the deviation to the electric power command signal from the compensating circuit in order to output the added correction value as an electric power control signal to the electric power control circuit.
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Iwata Shigemi
Okumura Masahide
Duncanson Jr. W. E.
Mitsubishi Denki & Kabushiki Kaisha
Pellinen A.D.
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