| 摘要 |
First and second shafts ( 1, 2 ) are interconnected via a torsion bar ( 3 ) for torsional (or rotational) movement relative to each other, and first and second magnetic body sections ( 10, 20 ) are provided to rotate in interlocked relation to the rotation of the first and second shafts, respectively. The first and second magnetic body sections form at least two ring-shaped variable magnetic coupling sections opposed to each other via a gap, magnetic coupling in each of the boundary sections varies in response to variation of a relative rotational position between the first and second shafts, and variation of the magnetic coupling differs in phase between the boundary sections. Coil section ( 30 ) includes magnetic-coupling detecting coils (L 1 -L 4 ) provided in corresponding relation to the boundary sections. Each of the first and second magnetic body sections is of a cylindrical shape and has a plurality of magnetic teeth formed at unequal pitches along the circumferential direction thereof, and the magnetic teeth differ in axial length among tooth groups corresponding to the boundary sections.
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