Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
April 12, 2011
Patent Application Number
12461733
Date Filed
August 21, 2009
Patent Citations Received
Patent Primary Examiner
Patent abstract
A rotation detection device includes a plurality of magnetic encoders of a ring shape arranged coaxially and having different numbers of magnetic poles, a plurality of magnetic sensors each operable to detect the magnetic field of the corresponding magnetic encoder and having a function of detecting positional information within a single magnetic pole of the corresponding magnetic encoder, a phase difference detector to determine the phase difference of magnetic field signals detected respectively by the magnetic sensors, and an angle calculator to calculate an absolute rotation angle of the magnetic encoders based on the detected phase difference.
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