Magnetostrictive torque sensor and method of manufacturing same
AssigneeHonda Motor Co., Ltd.
InventorsAtsuhiko Yoneda, Yasuo Shimizu
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Abstract
A magnetostrictive torque sensor includes a single magnetostrictive film disposed on a steering shaft, and first and second coils for detecting changes in a magnetic property of the magnetostrictive film. The single magnetostrictive film includes a first anisotropic region and a second anisotropic region, having respective magnetic anisotropies inverse to each other. The first coil is disposed in confronting relation to the first anisotropic region, whereas the second coil is disposed in confronting relation to the second anisotropic region.
Claims9
A magnetostrictive torque sensor comprising:
- a shaft member;
- at least one magnetostrictive film disposed on the shaft member;
- and
- a plurality of coils for detecting a change in a magnetic property of the magnetostrictive film;
- wherein the at least one magnetostrictive film includes a plurality of regions having different magnetic anisotropies formed therein via localized high-frequency heating after the film has been disposed on the shaft member.
A method of manufacturing a magnetostrictive torque sensor comprising a shaft member, at least one magnetostrictive film mounted on the shaft member, and a plurality of coils for detecting a change in a magnetic property of the magnetostrictive film, wherein the at least one magnetostrictive film includes a plurality of different magnetic anisotropies, the method comprising the steps of:
- forming the at least one magnetostrictive film on a surface of the shaft member;
- and
- high-frequency heating the magnetostrictive film while a torsional torque is applied to the shaft member.
Dependencies are inferred from the claim text.