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:
Mar. 02, 2010
Filed:
Aug. 23, 2007
Kouki Yamamoto, Hitachinaka, JP;
Toshiaki Okuyama, Tokai, JP;
Hiroyuki Tomita, Funabashi, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Koichiro Nagata, Mito, JP;
Kouki Yamamoto, Hitachinaka, JP;
Toshiaki Okuyama, Tokai, JP;
Hiroyuki Tomita, Funabashi, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Koichiro Nagata, Mito, JP;
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Abstract
The present invention provides an induction motor controller which includes: a circuit for generating a d-axis current reference signal from a d-axis current command value and a periodically varying periodic signal; a d-axis current controller for controlling a d-axis motor current flowing through an induction motor to be controlled to match the d-axis current reference signal; parameter determining means for calculating and determining a motor parameter of the induction motor based on a deviation of the d-axis motor current from the d-axis current reference signal, and controlling a voltage applied to the induction motor using a compensation voltage calculated from the calculated and determined motor parameter, in which a control parameter for controlling the induction motor is set based on the calculated and determined motor parameter.