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Linear distance sensor and the use thereof as actuator for motor vehicles

  • US 20030000307A1
  • Filed: 07/12/2002
  • Published: 01/02/2003
  • Est. Priority Date: 01/13/2000
  • Status: Active Grant
First Claim
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1. Linear distance sensor for motor vehicles with at least one axially displaceable element (4, 5, 7) composed of one part or several parts and a stator (1, 2, 3), wherein one or more field-generating means (9, 9

  • ) with a permanently existing modulated course (33) of lines of magnetic flux and/or a modulated magnetic field strength is/are arranged in the displaceable element, and the field-generating means along its/their longitudinal axis include(s) at least one permanent-magnetic material with a modulated course of lines of flux and/or a modulated field strength (31, 32), and wherein one or more sensor modules are stationarily connected to the stator and carry at least one magnetic field sensor (S, S′

    ) and, optionally, one or more sensor circuits (SC, SC′

    ), the said sensor module(s) converting the course of lines of magnetic flux completely or partially into output signals that can be further processed, and wherein the magnetic field sensors operate either according to the AMR principle, the GMR principle, or the Hall principle, characterized in that the displaceable element is guided by means of a bearing (11) connected to the stator and embracing the displaceable element at least partly and thereby guiding it axially, in that the sensor module(s) is/are stationarily connected to the stator, and in that along the longitudinal axis of the displaceable element the field-generating means is/are positively connected to the displaceable element.

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