发明授权
- 专利标题: Torque detecting apparatus
- 专利标题(中): 转矩检测装置
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申请号: US192621申请日: 1988-05-11
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公开(公告)号: US4811609A公开(公告)日: 1989-03-14
- 发明人: Yuji Nishibe , Yutaka Nonomura , Masaharu Takeuchi
- 申请人: Yuji Nishibe , Yutaka Nonomura , Masaharu Takeuchi
- 申请人地址: JPX Aichi
- 专利权人: Kabushiki Kaisha Toyota Chuo Kenkyusho
- 当前专利权人: Kabushiki Kaisha Toyota Chuo Kenkyusho
- 当前专利权人地址: JPX Aichi
- 优先权: JPX62-115362 19870512
- 主分类号: G01L1/00
- IPC分类号: G01L1/00 ; G01L3/10
摘要:
A torque detecting apparatus for measuring the amount of magnetostriction of a rotary magnetic material which transmits torque by means of a magnetic sensor, and detecting the transmitted torque on the basis of the measured amount of magnetostriction. The apparatus comprises a magnetic sensor for measuring the amount of magnetostriction of the rotary magnetic material, a demagnetization coil which is opposed to the rotary magnetic material so as to restore the rotary magnetic material magnetized by a disturbing magnetic field to the state of zero magnetization, a demagnetization circuit for applying an oscillating current to the demagnetization coil so as to generate in the rotary magnetic material a periodic damping oscillating magnetic field having the maximum value larger than the coercive force of the rotary magnetic material; and a trigger circuit for outputting a drive timing signal for the demagnetization circuit. The transmitted torque is detected without being influenced by a disturbing magnetic field.