| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a magnetostrictive torque sensor capable of suppressing external magnetic field noise in a wide range of frequency band. <P>SOLUTION: A magnetostrictive torque sensor 41 comprises: a rotation shaft 24 having magnetostrictive parts such as magnetostrictive films 81, 82; coils such as detection coils 85, 85, 85, 85 for detecting changes in magnetic characteristics such as magnetic permeability of the magnetostrictive films 81, 82; and a magnetic shield such as a sensor housing 55 surrounding peripheries of the coils and the magnetostrictive parts. The magnetic shield includes at least a first shield layer such as a body 55a and a flange 55b and a second shield layer such as an upper layer 55c. The magnetic permeability of the first shield layer such as iron is different from the magnetic permeability of the second shield layer such as copper, or the electric conductivity of the first shield layer such as iron is different from the electric conductivity of the second shield layer such as copper. <P>COPYRIGHT: (C)2013,JPO&INPIT |
