Accession Number : AD0164272
Title : Digital Positioning Motor Control for an Elevator.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C
Personal Author(s) : Davis,Lanny L. ; Radke,Wilmer G.
Report Date : 29 JUN 1971
Pagination or Media Count : 7
Abstract : The patent describes an elevator control system having an encoder connected to the elevator cable drum shaft that provides output signals indicating the exact position of elevator travel. The output of the encoder is sensed by a plurality of comparators which provide output signal at top and bottom maximum travel positions and various intermediate positions. At a predetermined distance on both sides of these positions, the comparators provide signals to slow down the elevator. Speed control logic employing the encoder, flip-flops and a comparator is also employed.
Descriptors : *Elevators(Lifts), *Control, *Patents, Circuits, Coders, Digital systems, Logic, Comparators
Subject Categories : Machinery and Tools
Distribution Statement : APPROVED FOR PUBLIC RELEASE