| 摘要 |
PURPOSE:To detect torque highly accurately, by forming an anisotropic band of stress magnetism on the surface layer of a rotary shaft itself, and detecting the change in permeability at said part. CONSTITUTION:An anisotropic band 11, to which stress magnetism anisotropy is imparted, is provided on the surface of a rotary shaft 10 as a readily magnetizing axis. The region 11 has an approximately stripe shape having a suitable width. The outer surface of the shaft is wound around wit the region 11. The stress magnetism anisotropy in the anisotropic region 11 is imparted at a constant slant angle alpha with respect to the circumferential direction at any position of the outer surface. An exciting winding 20 and a detecting winding 40 are arranged in a rotary symmetric pattern wit respect to the rotary shaft 10. When torque T is applied to the rotary shaft 10, anisotropy in stress-induced magnetism on one axis is yielded in the magnetized band 11. The permeability of the magnetized band 11 is changed in proportion to the applied torque. Accordingly, the change in inductance generated in the detecting winding 40 is outputted to an AC voltmeter 50 as the change in induced voltage caused by mutual induction between the detecting winding 40 and the exciting winding 20.
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