发明名称 Arrangement for determining the position of a motion sensor element
摘要 An arrangement for determining the position of a motion sensor element influencing the formation of a magnetic field of a working magnet periodically along its motion co-ordinate, the arrangement comprising a sensor arrangement, impressed with the magnetic field of the working magnet, which is sensitive along a measuring direction aligned at least substantially parallel to the motion co-ordinate of the motion sensor element to at least the polarity of the magnetic field of the working magnet impressed on the sensor arrangement and is adapted to supply a measuring signal in dependence upon a field component of the magnetic field of the working magnet impressed on the arrangement, denoted as measuring field and measured in the measuring direction, wherein the motion sensor element, arranged in a strip-shaped zone of a main surface extending along the motion co-ordinate of the motion sensor element, comprises periodically recurrent areas alternately influencing the measuring field which is being formed parallel to the main surface and is at least substantially parallel to the motion co-ordinate of the motion sensor element, and the measuring direction of the sensor arrangement is aligned at least substantially parallel to the main surface of the motion sensor element, wherein the magnetic field of the working magnet impressed on the sensor arrangement is aligned substantially perpendicular to the main surface of the motion sensor element with its main component determined by the principal direction of the magnetic field lines, wherein the sensor arrangement is formed as a magnetoresistive sensor arrangement with at least one half bridge comprising at least two magnetoresistive sensor elements, which sensor elements are sensitive along the measuring direction to the magnetic field strength of the magnetic field of the working magnet and are adapted to supply the measuring signal in dependence upon the measuring field, at least two sensor elements in each half bridge having barberpole structures with mutually different alignments. This arrangement for determining the position of the motion sensor element further comprises: an arrangement for generating an additional magnetic field having a variable magnetic field strength, which additional magnetic field is aligned, at least substantially in the area of the extension of the sensor elements, substantially parallel to the magnetic field of the working magnet with its main component determined by the principal direction of its magnetic field lines, and for superimposing the magnetic field of the working magnet with said additional magnetic field so as to form a resultant magnetic field producing a resultant measuring field, an arrangement for temporally varying the magnetic field strength of the additional magnetic field for detecting values of the measuring signal in dependence upon these variations of the additional magnetic field and for storing these values of the measuring signal, and an evaluation unit for forming an output signal representing a measure of the motion co-ordinate of the motion sensor element by subtracting at least two consecutively detected values of the measuring signal. The arrangement according to the invention provides the possibility of a reliable operation, with a simple structure, also under said conditions and, in connection with a great freedom from interference, it is also quite insensitive to manufacturing tolerances.
申请公布号 US2003222642(A1) 申请公布日期 2003.12.04
申请号 US20030379321 申请日期 2003.03.04
申请人 BUTZMANN STEFAN 发明人 BUTZMANN STEFAN
分类号 G01D5/14;G01D5/16;G01D5/244;G01P3/488;G01R33/07;(IPC1-7):G01B7/30;G01R33/025 主分类号 G01D5/14
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