| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a magnetostrictive torque sensor capable of suppressing deterioration in detection sensitivity. <P>SOLUTION: A magnetostrictive torque sensor 41 comprises: a rotation shaft 24 having a magnetostrictive part such as a magnetostrictive film 82; excitation coils 85, 85 for exciting the magnetostrictive film 82; detection coils 85, 85 for detecting changes in magnetic characteristics such as magnetic permeability of the magnetostrictive film 82; and a magnetic shield 54a surrounding at least peripheries of the excitation coils 85, 85. The rotation shaft 24 is made of a magnetic material. The magnetic shield 54a further surrounds a periphery of a part of the rotation shaft 24 having no magnetostrictive part 82. The magnetic shield 54a includes a slit 54as that is parallel to a central axis CL of the rotation shaft 24 in a part corresponding to the excitation coils 85, 85. <P>COPYRIGHT: (C)2013,JPO&INPIT |
