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