MAGNETOSTRICTIVE STRESS SENSOR

摘要

Magnetostrictive stress sensors (11, 12, 13, 14, 15, 16) comprise magnetic members (20, 107, 108, 109, 110, 111, 112) having magnetostriction, permanent magnets (30, 35, 113) in proximity to the magnetic members (20, 107, 108, 109, 110, 111, 112), and magnetic sensors (40, 104A, 104B) for detecting leaked magnetic fluxes on the opposite sides of the permanent magnets (30, 35, 113) with respect to the magnetic members (20, 107, 108, 109, 110, 111, 112), respectively. The stresses acting on the magnetic members (20, 107, 108, 109, 110, 111, 112) are detected by detecting the variations of the leaked magnetic fluxes varying according to the stresses acting on the magnetic members (20, 107, 108, 109, 110, 111, 112) with use of the magnetic sensors (40, 104A, 104B), respectively. The magnetostrictive stress sensors (11, 12, 13, 14, 15, 16) are characterized in that the directions (21, 108A, 109A) of the stresses acting on the magnetic members (20, 107, 108, 109, 110, 111, 112) and the magnetizing directions (31, 31, 113A) of the permanent magnets (30, 35, 113) are substantially orthogonal to each other.