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:
Sep. 04, 2001
Filed:
Feb. 03, 1999
Pekka Jahkonen, Helsinki, FI;
Tapio Saarikoski, Hyvinkaa, FI;
Kone Corporation, Helsinki, FI;
Abstract
A procedure determines the parameters for an electric drive that controls a synchronous elevator motor having permanent magnets, a computer controlling the operation of the electric drive being provided with a control model describing the elevator and containing settable parameters. To determine electric drive parameters, an elevator car installed in the elevator shaft is allowed to enter a motional condition produced by the balance difference between the elevator masses using two different loads connected to the terminals of the synchronous motor, the rotational speed, electromotive force and synchronous reactance of the synchronous motor are measured while the elevator car is in a constant motional condition, and the stator resistance is measured via a separate measure. A control model describing the elevator is computed and formed from these measurements.