发明名称 |
Torque detecting apparatus |
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. |
申请公布号 |
US4811609(A) |
申请公布日期 |
1989.03.14 |
申请号 |
US19880192621 |
申请日期 |
1988.05.11 |
申请人 |
KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO |
发明人 |
NISHIBE, YUJI;NONOMURA, YUTAKA;TAKEUCHI, MASAHARU |
分类号 |
G01L1/00;G01L3/10;(IPC1-7):G01L3/10 |
主分类号 |
G01L1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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