The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 01, 1999
Filed:
Dec. 22, 1997
Alberto Vecchiotti, Middletown, CT (US);
Roy Stephen Colby, Raleigh, NC (US);
Otis Elevator Company, Farmington, CT (US);
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 a loss component VDX and while varying .tau..sub.R and determining the value of .tau..sub.R at which VDX for the up and down elevator runs are the same within a predetermined tolerance and which automatically calculates a magnetizing current (Id) by running the elevator in a predetermined direction while calculating a motor voltage Vm and varying Id and determining a new value of .tau..sub.R by performing the up/down elevator run until Vm is within a predetermined tolerance of a target voltage V.sub.T.