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Simplified inductive position sensor and circuit configuration

  • US 7,135,855 B2
  • Filed: 05/17/2004
  • Issued: 11/14/2006
  • Est. Priority Date: 05/17/2004
  • Status: Active Grant
First Claim
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1. A device for the measurement of position along a linear, rotary, or curved motion axis, the device comprising a sensing element, a core assembly, and a drive oscillator, the drive oscillator driving the sensing element with an alternatine current at a variable frequency,the sensing element comprising at least one electrically nonconductive substrate and at least two planar conductor patterns, the conductor patterns forming at least two inductances, at least two of the inductances connected together in series,the core assembly comprising at least one electrically conductive or ferromagnetic structure, the structure moving essentially in parallel to a surface of the substrate such that it becomes more aligned over a given conductor pattern as a measured position varies along the motion axis, at least one structure shaped to cause a variation in the inductance of the conductor pattern over which it is more closely aligned, the magnitude of at least one inductance providing an informative signal that is indicative of the measured position.

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