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:
Jan. 01, 2013
Filed:
Sep. 29, 2010
Applicant:
Kazumasa Takai, Kagamigahara, JP;
Inventor:
Kazumasa Takai, Kagamigahara, JP;
Assignees:
Sanyo Electric Co., Ltd, Osaka, JP;
Sanyo Semiconductor Co., Ltd, Gunma, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 6/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
A differential amplifier detects a coil current Is at the time of steady rotation of a synchronous motor. An application voltage Sat this time is detected from an output of an ATT circuit and so on. With the use of the coil current Is which is detected, the application voltage Sat that time, and a predetermined scaling factor As, an induced current Ib is obtained based on Ib=As·S−Is. The application voltage to the motor is controlled based on the induced current Ib which is obtained.