| 摘要 |
PROBLEM TO BE SOLVED: To provide a torque measuring apparatus in which a zero-point fluctuation and a sensitivity fluctuation can be corrected precisely even when a temperature difference is generated in a detection part used to detect a torque. SOLUTION: The torque T to be detected is applied to a detection shaft 1, magnetostrictive material parts 2, 3 are formed on its outer circumference, and detection coils 4, 5 are installed respectively so as to be adjacent to the parts 2, 3. A resistance 15 is connected to the detection coil 4, a resistance 16 is connected to the detection coil 5, and a bridge circuit 18 is constituted of them. An AC signal generator 17 applies an AC signal to the input end of the bridge circuit. Temperature detection circuits 6, 7 are arranged near the detection coils 4, 5. A zero-point correction circuit 21 corrects the zero point of a torque detection output on the basis of the output of the circuit 6. A sensitivity correction circuit 50 corrects the sensitivity of the torque detection output on the basis of the output of the circuit 6. A zero-point correction circuit 22 and a sensitivity correction circuit 51 function in the same manner.
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