Detection circuit and detection method for magnetostrictive torque sensor
AssigneesHitachi Metals, Ltd., Nsk Ltd.
InventorsYuta Sugiyama, Teruyuki Nakamura, Junji Ono, Kota Fukuda
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Abstract
A detection circuit for a magnetostrictive torque sensor is configured to detect a torque applied to a magnetostrictive material treated by shot peening. The detection circuit includes a detection coil provided around the magnetostrictive material, and a drive unit for providing alternating current excitation to the detection coil. The torque applied to the magnetostrictive material is detected based on a change in inductance of the detection coil, and the drive unit provides alternating current excitation at a frequency at which a skin effect thickness is not more than an effective depth of the shot peening.
Claims9
A detection circuit for a magnetostrictive torque sensor configured to detect a torque applied to a magnetostrictive material treated by shot peening, the detection circuit comprising:
- a detection coil provided around the magnetostrictive material;
- and
- a drive unit for providing alternating current excitation to the detection coil,
- wherein the torque applied to the magnetostrictive material is detected based on a change in inductance of the detection coil, and the drive unit provides alternating current excitation at a frequency at which a skin effect thickness is not more than an effective depth of the shot peening.
A detection method for a magnetostrictive torque sensor configured to detect a torque applied to a magnetostrictive material treated by shot peening, the method comprising:
- using a detection coil provided around the magnetostrictive material, and a drive unit for providing alternating current excitation to the detection coil at a frequency at which a skin effect thickness is not more than an effective depth of the shot peening;
- and
- detecting a torque applied to the magnetostrictive material based on a change in inductance of the detection coil.
Dependencies are inferred from the claim text.