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. 04, 2011
Filed:
May. 24, 2005
Norihiro Maeda, Kyoto, JP;
Seiichi Yamamoto, Kyoto, JP;
Norihiro Maeda, Kyoto, JP;
Seiichi Yamamoto, Kyoto, JP;
Rohm Co., Ltd., , JP;
Abstract
A technology for correctly detecting a rotating position of a rotator at the time of rotation start. A rotation control apparatus controls rotation of a motor, which includes a stator provided with a plurality of coils and a rotor having magnetism. At the time of detecting a position of the motor when the motor is stopped, a control part supplies a current to a plurality of different paths including the coils, a stopped position detecting part measures the current flowing in each of the plurality of paths, judges the order of the measured current values, and a rotating position of the motor is detected based on the order. Based on a combination of a path showing the highest current value and a path showing the second highest current value, the stopped time position detecting part judges a position of the motor.