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. 03, 2007
Filed:
Oct. 19, 2001
Applicants:
Daigo Kaneko, Hitachi, JP;
Hiromi Inaba, Hitachinaka, JP;
Tsunehiro Endo, Hitachiota, JP;
Ikuo Yamato, Hitachi, JP;
Naoto Ohnuma, Hitachi, JP;
Inventors:
Daigo Kaneko, Hitachi, JP;
Hiromi Inaba, Hitachinaka, JP;
Tsunehiro Endo, Hitachiota, JP;
Ikuo Yamato, Hitachi, JP;
Naoto Ohnuma, Hitachi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 6/00 (2006.01); H02P 23/00 (2006.01); H02P 25/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
In order to control the position of a mobile body without using a position detector, a magnetic pole position of a rotor of a synchronous motor is estimated based on electrical quantities in relation to electric power supplied to the synchronous motor and then the mobile body position is estimated based on the estimated magnetic pole position.