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:
Aug. 22, 2006
Filed:
Mar. 29, 2004
Masaki Tagome, Hirakata, JP;
Hideaki Mori, Sakai, JP;
Hisanori Nagase, Ibaraki, JP;
Makoto Gotou, Nishinomiya, JP;
Masaki Tagome, Hirakata, JP;
Hideaki Mori, Sakai, JP;
Hisanori Nagase, Ibaraki, JP;
Makoto Gotou, Nishinomiya, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In a motor and a disk drive apparatus in accordance with the present invention, a position detecting partcomprises a detection signal switching circuitA, a noise elimination circuitand a detection circuitB, and the detection signal switching circuitA is configured to output an inverted detection signal obtained by logically inverting a detection signal until the rotation speed reaches a predetermined rotation speed after the beginning of starting or until a position detection pulse signal FG is detected a predetermined number of times; position detection operation is carried out only during the ON operation of PWM, whereby PWM sensorless starting is carried out.