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:
May. 02, 2006
Filed:
Jul. 05, 2001
Shuichi Fujii, Fukuoka, JP;
Hideaki Iura, Fukuoka, JP;
Kozo Ide, Fukuoka, JP;
Yoshiaki Yukihira, Fukuoka, JP;
Shuichi Fujii, Fukuoka, JP;
Hideaki Iura, Fukuoka, JP;
Kozo Ide, Fukuoka, JP;
Yoshiaki Yukihira, Fukuoka, JP;
Kabushiki Kaisha Yasukawa Denki, Fukuoka, JP;
Abstract
A method of measuring a motor constant is provided in a vector control apparatus for an induction motor. A voltage output phase θv is set at a previously set arbitrary phase. Prior to applying a current, a current command is fed to operate the vector control apparatus with a proportional-plus-integral controller being set operative. After conduction for a predetermined time, the gain of the proportional-plus-integral controller is set to zero to maintain an integrated value constant and accordingly fix a voltage command value. In this state, a current command value and a detected current value are measured. This measurement is performed at two levels of current, and a primary resistance value (or a line-to-line resistance value) is derived from the slope.