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:
Jun. 25, 2002
Filed:
Aug. 07, 2001
Makoto Gotou, Nishinomiya, JP;
Matsushita Electric Industrial Co., Ltd., Osaka-fu, JP;
Abstract
A disk drive apparatus comprises three first power amplifying means; three second power amplifying means; three phase windings; a movable member; commanding means for outputting a command signal corresponding to a rotational speed of the movable member; and current detecting means for providing a current detected signal in response to a supply current supplied to the three-phase windings. A switching control means causes two of the three first power amplifying means to perform high-frequency switching simultaneously in response to the current detected signal and the command signal and causes two of the three second power amplifying means to perform high-frequency switching simultaneously in response to the current detected signal and the command signal.