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Method for increasing the positioning accuracy of an element which is movably arranged relative to a stator

  • US 6,532,791 B2
  • Filed: 10/01/2001
  • Issued: 03/18/2003
  • Est. Priority Date: 10/04/2000
  • Status: Expired due to Fees
First Claim
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1. A method for increasing the positioning accuracy of an element (13) which is movably arranged relative to a stator (10), with at least two sensors (11, 12) being provided in the stator (10), a first sensor (11) and a second sensor (12), which are arranged at a distance (a) from one another in the stator (10), with respect to the movement direction (P) of the movably arranged element (13), and with the relative to the stator (10) movably arranged element (13) being provided with encoders (130) which can move together with the movable element (13) and, when the element (13) carries out a movement relative to the stator (10), firstly produce a sensor signal (S11) in the first sensor (11) and then, as the movement of the element progresses, produce a sensor signal (S12) in the second sensor (12),wherein, first of all, in a calibration run, the movable element (13) is moved over the entire possible range of movement and, during this movement, the sensor signals (S11, S12) of the first sensor (11) and of the second sensor (12) as well as the associated nominal positions of the movable element (13) are detected, wherein the spatial distance (A) is then determined which corresponds to two sensor signals (S11, S12), which are of equal magnitude, follow one another and are caused by the same encoder, of the first sensor (11) and of the second sensor (12), and wherein the error (F) of the nominal position of the movable element is then determined from the spatial distance (A) determined in this way, from the actual distance between the sensors (a) and from the associated nominal positions, and is taken into account in the positioning of the movable element (13).

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