| 摘要 |
Electromagnetic structure is described useful as either a position indicator or a differential transformer. The structure includes a pair of magnetic bodies, one of which is rotatable on its axis with respect to the other. The stationary body has three magnetic flux conductive poles projecting from the same to be in alignment with corresponding lobes circumscribing the rotatable body. Aligned poles and lobes define a portion of a pair of closed-loop magnetic flux paths through the two bodies. The middle one of the lobes extends generally transverse to the rotatable axis of the rotatable body, whereas the two outer lobes are spirally related thereto. Rotation of the rotatable body with respect to the stationary body will vary the transverse area of the magnetic material of each of its lobes facing corresponding poles of the other body and, hence, vary the amount of flux which can travel along the flux paths. A primary electrical coil carrying alternating current is wrapped around the middle one of the poles to produce flux to flow along such paths, and a pair of secondary coils connected in series opposition to one another are respectively wrapped around the two outer poles to have electromotive force generated therein proportional to the amount of flux which flows through their respectively associated poles.
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