发明名称 |
Rotation angle detector |
摘要 |
A rotation angle detector includes: a magnet attached to a rotating shaft and magnetized in a certain direction orthogonal to an axis of the rotating shaft; and a non-rotary magneto-electric transducer placed to be opposed to an end surface of the magnet, and configured to detect a rotation angle of the rotating shaft in cooperation with the magnet through magneto-electric transduction. A concave curved surface is formed in the end surface of the magnet in order to make a magnetic flux of a magnetic field facing the end surface of the magnet closer to the magnet and flattened. Accordingly, it is possible to provide a rotation angle detector which is compact in size and has a stable accuracy for detecting the rotation angle, by making the curvature of the magnetic flux near the end surface of the magnet small and placing the magneto-electric transducer in that location. |
申请公布号 |
US9024625(B2) |
申请公布日期 |
2015.05.05 |
申请号 |
US201313740502 |
申请日期 |
2013.01.14 |
申请人 |
Keihin Corporation |
发明人 |
Akabane Akira |
分类号 |
G01B7/30;G01D5/14 |
主分类号 |
G01B7/30 |
代理机构 |
Carrier Blackman & Associates, P.C. |
代理人 |
Carrier Blackman & Associates, P.C. ;Carrier Joseph P.;Blackman William D. |
主权项 |
1. A rotation angle detector comprising:
a magnet attached to an end portion of a rotating shaft, and magnetized in a predetermined direction orthogonal to an axis of the rotating shaft; and a non-rotary magneto-electric transducer placed so as to be opposed to an end surface of the magnet in a direction of the axis of the rotating shaft, that detects a rotation angle of the rotating shaft in cooperation with the magnet through magneto-electric transduction, wherein the magnet has a similar diameter as the end portion of the rotating shaft and has a solid cylindrical shape, and a concave curved surface is formed in the end surface of the magnet opposite the non-rotary magneto-electric transducer in order to direct a magnetic flux of a magnetic field of the magnet closer to the magnet in the direction of the axis of the rotating shaft. |
地址 |
Tokyo JP |