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:
Apr. 02, 2002
Filed:
Nov. 03, 1999
Leos Chalupa, Jemnice, CZ;
Radim Visinka, Olesnice, CZ;
Motorola, Inc., Schaumburg, IL (US);
Abstract
A controller ( ) which estimates the coil resistance (R) of an electric motor ( ), receives representations of a voltage (u(t)) across a stator coil ( ) and of a current (i(t)) through the coil ( ). At first, the controller ( ) estimates the magnetic flux ( (t )) in the coil by integrating the difference between u(t) and the product between the current with a preliminary resistance ( ) over a predetermined time interval (t , t ) in which the coil ( ) is energized. Second, the controller ( ) calculates a resistance error ( R) using a known actual flux value (t ) at the end (t ) of the time interval, the previously estimated magnetic flux (t ) and the integral of the current over the time interval. Third, the calculator derives the coil resistance (R) from the preliminary resistance ( ) and the resistance error ( R).