rotation angle sensor

Abstract

The rotor (2) of the rotation angle sensor forms the strip-shaped body (31) of a magnetic steel sheet into a cylindrical shape with the thickness direction of the strip-shaped body (31) being a radial direction. A first concave-convex portion (32) is provided at an arc-shaped edge portion of the strip-shaped main body (31) at a substantially fixed pitch, and a first concave-convex portion (32) is provided at an approximately fixed pitch at the other arc-shaped edge portion. 2 bumps (33). The first stator (3) is arranged opposite to the first concave-convex portion (32) of the belt-shaped main body (31) of the rotor (2), and the second stator (4) is arranged opposite to the second concave-convex portion (33).

Description

technical field [0001] The present invention relates to a variable reluctance type rotation angle sensor, and more particularly to a rotation angle sensor capable of miniaturization. Background technique [0002] As a rotation angle sensor that detects the rotation angle of a motor or the like, a variable reluctance type rotation angle sensor is widely used in many fields. This type of rotation angle sensor is configured as follows: a plurality of magnetic poles are provided on the inner peripheral side of an annular stator yoke, an excitation winding and a detection winding are wound on each magnetic pole as a stator winding, and the inner side of the stator is separated by a The gap is equipped with a core-type rotor. A SIN winding and a COS winding for detection, which have a phase difference of 90°, are wound around each magnetic pole of the stator as the winding for detection. [0003] The rotation angle sensor generates a SIN signal and a COS signal corresponding to ...

AI Technical Summary

Problems solved by technology

[0004] However, since the rotor of the conventional variable reluctance type rotation angle sensor is generally constituted by laminating many magnetic steel plates in the axial direction of the rotor as described in, for example, Patent Document 1 below, the many magnetic steel plates It is formed in a shape in which a plurality of salient poles protrude from the outer periphery, so its shape is enlarged

In addition, when a plurality of rotors are arranged in the axial direction and a plurality of stators are arranged corresponding to each rotor in order to provide a redundant function to the rotation angle sensor, the size of the rotation angle sensor is further increased.

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