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. 28, 2014
Filed:
Oct. 23, 2012
Tomohiko Kamatani, Hyogo, JP;
Haruyuki Suzuki, Kanagawa, JP;
Fumihiro Shimizu, Kanagawa, JP;
Katsuhisa Furuse, Hyogo, JP;
Tomohiko Kamatani, Hyogo, JP;
Haruyuki Suzuki, Kanagawa, JP;
Fumihiro Shimizu, Kanagawa, JP;
Katsuhisa Furuse, Hyogo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A motor drive controller to control a motor via multiple sensors includes a first phase detector to compare respective differential pairs of the sensor signals from the same sensor to detect phases of the rotor, and output a first phase information signal; a second phase detector to compare a respective one of the multiple sensor signals with another sensor signal from the different sensor to detect the phases and output a second phase information signal; a phase divider to divide the phases, detected by the first and second phase detectors, into multiple predetermined phase intervals; a signal selector to select one of the multiple sensor signals in the multiple predetermined phase intervals; and a third phase detector to detect whether the signal selected by the signal selector reaches a predetermined threshold level corresponding to a predetermined phase of the rotor, and output a third phase information signal.