发明授权
- 专利标题: Non-contact type rotation-angle sensing device
- 专利标题(中): 非接触式旋转角度检测装置
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申请号: US10815679申请日: 2004-04-02
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公开(公告)号: US06867584B1公开(公告)日: 2005-03-15
- 发明人: Kazuhisa Kurita , Kenji Nakao , Yoshihiko Onishi , Manabu Miyaki
- 申请人: Kazuhisa Kurita , Kenji Nakao , Yoshihiko Onishi , Manabu Miyaki
- 申请人地址: JP Tokyo
- 专利权人: Mitsubishi Denki Kabushiki Kaisha
- 当前专利权人: Mitsubishi Denki Kabushiki Kaisha
- 当前专利权人地址: JP Tokyo
- 代理机构: Sughrue Mion, PLLC
- 优先权: JPP2003-374173 20031104
- 主分类号: G01B7/30
- IPC分类号: G01B7/30 ; G01B7/00 ; G01D5/14 ; G01D5/245
摘要:
In a non-contact type rotation-angle sensing device, a rotation angle sensor (9) having magnetoresistance elements detects a rotation angle of an object to be measured. The object is rotatable round a rotary shaft (2) with respect to the rotation angle sensor (9) and includes a permanent magnet (5, 6). The permanent magnet (5, 6) is disposed symmetrically about said rotary shaft (2) of said object, and a magnetic element (7, 8) is disposed on said object between said permanent magnet (5, 6) and the magnetoresistance elements. In the non-contact type rotation-angle sensing device of above constitution according to the invention, linearity is secured by reducing magnetic hysteresis of the sensor output with respect to the rotation angle, thus a small-sized permanent magnet and reduction in cost being achieved.