发明授权
US08278916B2 Rotational angle sensor, motor, rotational angle detector, and electric power steering system
有权
旋转角度传感器，电机，旋转角度检测器和电动助力转向系统
- 专利标题： Rotational angle sensor, motor, rotational angle detector, and electric power steering system
- 专利标题（中）： 旋转角度传感器，电机，旋转角度检测器和电动助力转向系统
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申请号： US12886054申请日： 2010-09-20
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公开(公告)号： US08278916B2公开(公告)日： 2012-10-02
- 发明人: Kazuya Sakai
- 申请人： Kazuya Sakai
- 申请人地址： JP Osaka
- 专利权人： JTEKT Corporation
- 当前专利权人： JTEKT Corporation
- 当前专利权人地址： JP Osaka
- 代理机构： Oliff & Berridge, PLC
- 优先权： JP2009-218800 20090924
- 主分类号： G01B7/30
- IPC分类号： G01B7/30
摘要：
A rotational angle sensor includes: a magnet rotor in which multiple magnetic poles are formed along the circumferential direction of the magnet rotor; and three sensor devices that are arranged on a circle concentric with the magnet rotor at regular angle intervals. Each of the sensor devices includes three half-bridge circuits each of which has a pair of spin valve magnetic resistances that are connected in series in such a manner that the magnetization directions of spin fixed layers of the spin valve magnetic resistances are opposite to each other. Each of the sensor devices is formed in such a manner that phases of the sensor signals output from the respective half-bridge circuits based on a change in magnetic flux caused by the rotation of the magnet rotor are offset from each other by an electrical angle of 120°.
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