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:
Oct. 16, 2007
Filed:
Nov. 16, 2005
Noriyuki Takemasa, Fujieda, JP;
Ayako Yamada, Fujieda, JP;
Hiromi Iwasaki, Fujieda, JP;
Norihiro Suzuki, Fujieda, JP;
Noriyuki Takemasa, Fujieda, JP;
Ayako Yamada, Fujieda, JP;
Hiromi Iwasaki, Fujieda, JP;
Norihiro Suzuki, Fujieda, JP;
Murakami Corporation, Shizuoka, JP;
Abstract
The present invention provides a DC brush motor rotation amount detection method comprising the steps of: counting pulses generated by switching of brushes when a DC brush motor rotates; removing any noise pulse generated during a pulse rejection period which is shorter than a pulse interval and which is started when each pulse is generated; counting pulses generated during pulse acceptance periods outside the pulse rejection periods; and detecting a rotation amount of the DC brush motor, wherein the pulse rejection period during steady-state operation of the DC brush motor is ended when a predetermined time elapses from a start point of the pulse rejection period, where the predetermined time is calculated by multiplying a pulse interval of a corresponding pulse zone one rotation before a pulse zone to which the pulse rejection period belongs by a coefficient K(½<K<1).