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:
Nov. 20, 2001
Filed:
Aug. 10, 1999
Satoru Kaneko, Urizura-machi, Naka-gun, Ibaraki 319-2104, JP;
Ryoso Masaki, Hitachi-shi, Ibaraki 319-1413, JP;
Yuusuke Takamoto, Hitachi-shi, Ibaraki 316-0014, JP;
Taizou Miyazaki, Hitachi-shi, Ibaraki 316-0024, JP;
Sanshiro Obara, Toukai-mura, Naka-gun, Ibaraki 319-1106, JP;
Other;
Abstract
A power corresponding to an A/C voltage command id,* is applied in the d-axis direction of rotational coordinates of a stopped synchronous motor via a current control unit, a three-phase converting unit, and a power converter. Further, by using “an amplitude value of a current iq′ in the q-axis direction of the rotational coordinates generated in response to the A/C voltage command id,*” which is fed back and detected via a current detector and a dq converting unit, a field pole position estimation value &thgr;{circumflex over ( )} is converged. The field pole position is estimated by using the converged field pole position estimation value &thgr;{circumflex over ( )} as a true value of the field pole position &thgr; of the synchronous motor.