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:
Oct. 25, 2011
Filed:
Nov. 25, 2008
Applicants:
Junnosuke Nakatsugawa, Hitachi, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Kazuaki Tobari, Hitachiota, JP;
Kiyoshi Sakamoto, Hitachinaka, JP;
Inventors:
Junnosuke Nakatsugawa, Hitachi, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Kazuaki Tobari, Hitachiota, JP;
Kiyoshi Sakamoto, Hitachinaka, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H02P 21/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
It is attained by being provided with a motor constant calculation unit for calculating electric constants of a motor, and by correcting setting values of electric constants defined on one of the axes of two orthogonal axes, by a functional expression using a state variable defined on the same axis, and by correcting them by a functional expression using a state variable defined on the other axis.