ROTATION ANGLE DETECTING DEVICE - FURUKAWA ELECTRIC CO LTD

Title:

ROTATION ANGLE DETECTING DEVICE

Document Type and Number:

WIPO Patent Application WO/2008/050843

Kind Code:

A1

Abstract:

Provided is a rotation angle detecting device including first rotation detecting means (50) and second rotation detecting means (72) for detecting the rotation angle of an object rotor (S) continuously for periods different from each other. In these individual rotating detecting means, the individual output signals obtained to correspond to the rotations of the object rotor are increased or decreased in the same direction in accordance with the rotational direction of the object rotor. The difference of the individual output signals corresponding to the rotations of the object rotor and obtained by the first rotation detecting means and the second rotation detecting means is taken, and this output difference is used to detect the absolute rotation angle, which is defined by the least common multiple between the period of the first output signal obtained by the first rotation detecting means and the period of the second output signal obtained by the second rotation detecting means, within the detectable rotation angle. As a result, the rotation angle detecting device can reduce the number of parts to constitute itself, thereby to achieve its size reduction and to detect the rotation angle highly precisely.

Inventors:

HORI SHINJI (JP)
TORATANI TOMOAKI (JP)

Application Number:

PCT/JP2007/070841

Publication Date:

May 02, 2008

Filing Date:

October 25, 2007

Export Citation:

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Assignee:

FURUKAWA ELECTRIC CO LTD (JP)
HORI SHINJI (JP)
TORATANI TOMOAKI (JP)

International Classes:

G01B7/30; G01B21/22; G01D5/244

Foreign References:

JP2004340677A	2004-12-02
JP2004138606A	2004-05-13
JP2006119082A	2006-05-11
JP2001505667A	2001-04-24
JP2004053444A	2004-02-19

Other References: