| 摘要 |
The invention relates to a measuring apparatus comprising a sensing head ( 15 ) for determining the position of a primary part ( 27 ) on a secondary part. The sensing head ( 15 ) is fixedly connected to a primary part ( 27 ) or is integrated therein while the primary part ( 27 ) and the secondary part form a linear motor ( 30 ). Furthermore, the secondary part is embodied as a rack ( 16 ) which is provided at least with ferromagnetic material and preferably equidistant teeth ( 18 ) in a preferred direction ( 13 ), said teeth ( 18 ) containing at least ferromagnetic material. The sensing head ( 15 ) can be moved in the preferred direction ( 13 ) and opposite thereto. An air gap is located between the sensing head ( 15 ) and the rack ( 16 ) while the sensing head ( 15 ) is equipped with at least one sensor ( 1 - 12, 19, 31 ), by means of which magnetic fields can be measured in order to determine a position.
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