| 摘要 |
PROBLEM TO BE SOLVED: To obtain a low-cost torque sensor which is easy to attach and detach. SOLUTION: This torque sensor 1 is equipped with an ultrasonic-wave generating means 5 having an ultrasonic-wave generating coil 2 and a 1st magnet 3, an ultrasonic-wave detecting means 9 having an ultrasonic-wave detection coil 6 and a 2nd magnet 7, and a torque converting means 11, and the ultrasonic- wave generating coil 2 is electrified by an AC power source 4 to generate an eddy current on the surface of a torsion bar 10 and the Lorentz force based upon the eddy current causes the torsion bar 10 to generate an ultrasonic wave. An ultrasonic wave propagated in the torsion bar 10 on which the torque is operating varies in frequency and the frequency of an induced current generated by the ultrasonic-wave detection coil 6 with the ultrasonic wave is detected to measure vary the frequency of the ultrasonic wave, so that a torque converting means 11 derives the torque.
|
