Patent · US Expired

Automatic fine tuning of rotor time constant in field-oriented elevator motor drive

US5896954A · kind A · utility

2Cited by

3References

10Claims

0Family size

Assignee

OTIS ELEVATOR COMPANY · US

Inventors

Roy S. Colby · Raleigh, US
Alberto Vecchiotti · Berlin, DE
Neil A. Greiner · Meridian Avenue, US

Key dates

Filing date	Dec 22, 1997
Grant date	Apr 27, 1999
Priority date	—
Expiry date	Dec 22, 2017

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB66B19/007
WIPO fieldHandling
WIPO sectorMechanical engineering

Abstract

An elevator controller 7 is provided with logic 48 which automatically calculates a motor time constant (.tau..sub.R) for a field-oriented current regulator/motor drive 20 by running the elevator up and down while computing an average of a sign-adjusted error signal DXD.sub.ERR for the up/down run and while varying .tau..sub.R and determining the value of .tau..sub.R at which the average of DXD.sub.ERR for the up and down runs equals zero within a predetermined tolerance. Alternatively, instead of computing the average of DXD.sub.ERR, a single elevator run may be used to determine the value of .tau..sub.R at which DXD.sub.ERR equals zero within a predetermined tolerance.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.