| 摘要 |
<p>The position sensing apparatus comprises first (36, 38) and second (48, 50) magnetic field conducting means which are rotatable with respect to each other about an axis (8). Each includes a plurality of magnetically permeable members having respective surfaces extending transversely from each other by gaps. The shaped surfaces of the first magnetic field conducting means (36, 38) face the surfaces of the second magnetic field conducting means (48, 50) and are separated from each other by a gap (54). The shapes, positions and areas of these surfaces are chosen to tailor the magnetic coupling between the first and second field conducting means for a desired output waveform over a selected angular range of rotation. Third magnetic field conducting means (40) is provided for magnetically coupling the magnetically permeable members of the first magnetic field conducting means (36, 38) though a sensor gap. Fourth magnetic field conducting means (52) is provided for directly magnetically coupling the magnetically permeable members of the second magnetic field conducting means (48, 50). A magnetic field producing means (44, 46) is also provided for effecting the production of a magnetic field having flux lines which pass through the first and second magnetic field conducting means in directions which are substantially parallel to the axis (8). Sensing means (8), such as a Hall cell, is disposed in the sensor gap for sensing the magnetic field magnitude in that gap. This magnitude represents the angular position of the first magnetic field conducting means relative to the other. The sensor (14) is in a direct flux path of a magnetic circuit formed by the various field conducting means and its electrical output is not significantly affected by extraneous magnetic fields of substantial magnitudes. <IMAGE></p> |
