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. 18, 2010
Filed:
Dec. 27, 2007
Applicants:
Kazuaki Tobari, Hitachiota, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Daigo Kaneko, Hitachi, JP;
Hajime Uematsu, Narashino, JP;
Masakazu Hase, Shizuoka, JP;
Inventors:
Kazuaki Tobari, Hitachiota, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Daigo Kaneko, Hitachi, JP;
Hajime Uematsu, Narashino, JP;
Masakazu Hase, Shizuoka, JP;
Assignee:
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H02P 23/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Current command values are used instead of detected current values to estimate axis error by calculation. An axis error command value is generated according to a speed command value, and a difference between the generated axis error command value and the estimated axis error value is used to control an estimated frequency value.