| 摘要 |
PURPOSE:To detect torque without contact and without imparting rotary angle dependence of a shaft, by fixing magnetic layers to the outer surface of a driven shaft, and detecting the change in permeability, which appears on the magnetic layers. CONSTITUTION:Magnetic layers 4 and 6 are fixed to the outer surface of a rotary shaft 1. When torque is applied to the rotary shaft 1, stress is yielded in the rotary shaft 1. Therefore, the similar compression stress and tensile stress are applied to the magnetic layers 4 and 6, which are fixed to the outer surface of the rotary shaft 1. The magnetic layers 4 and 6 have sufficiently long and thin shapes and are fixed to the right and left sides of the rotary shaft 1 in the directions of +45 deg. and -45 deg. with respect to a central axis 5 in a spiral shape. Therefore, the changing directions of the permeabilities of the magnetic layers 4 and 6 are opposite to each other. The changes in permeabilities are detected by detecting coils 8a, 8b, 9a, and 9b, and the stress, which is applied to the shaft 1, is measured. |
