Magnetostrictive torque sensor and design method of thickness of magnetic ring for magnetostrictive torque sensor
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United States of America Patent
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Oct 3, 2023
Grant Date -
Aug 4, 2022
app pub date -
Dec 27, 2021
filing date -
Jan 29, 2021
priority date (Note) -
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Abstract
A magnetostrictive torque sensor includes detection coils formed around a magnetostrictive material made of chrome steel or chrome molybdenum steel, a magnetic ring configured to cover around the detection coils, and a drive unit for providing alternating current excitation to the detection coils at an excitation frequency of 50 kHz or more and 333 kHz or less. A torque applied to the magnetostrictive material is detected based on a change in inductance of the detection coils. The magnetic ring is configured by wrapping around the detection coils with an amorphous tape made of amorphous soft magnetic material in a tape shape. The thickness of the magnetic ring is 1.455 times or more as thick as a skin effect thickness of the magnetostrictive material and less than 1.000 mm.
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