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AssigneeTechem Energy Services GmbH
InventorJurgen Reus
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A configuration and a method for capacitative sensing of the rotatory motion of a rotary member are described, whereby the configuration has four electrodes (1, 2, 3, 4) located in one plane, an attached analysis unit (18) and an electrically conducting coupling surface (5), which is located at the rotary member opposite to the electrodes (1, 2, 3, 4), whereby the electrodes (1, 2, 3, 4) comprise a central excitation electrode (4) surrounded by the remaining electrodes (1, 2, 3), whereby the coupling surface (5) is opposite to the surface of the excitation electrode (4) in every rotary position and covers a part of the surface formed by the remaining electrodes (1, 2, 3), and upon a rotation of the rotary member, passes over various sections of the surfaces formed by the remaining electrodes (1, 2, 3), and whereby the analysis unit (18) has an evaluation circuit (19) that is connected to the excitation electrode (4) for generating excitation pulses (13) having a specified frequency and an evaluation circuit (20) connected to the remaining electrodes (1 2, 3) for capturing the voltage signals applied to the remaining electrodes (1, 2, 3) and for comparing these voltage signals. The remaining electrodes (1, 2, 3) are formed by two sensor electrodes (1, 3) and one joint reference electrode (2), whereby at least the joint reference electrode (2) is designed different than the sensor electrodes (1, 3), and the evaluation circuit (20) is designed in such a way that respectively one difference (DIFF1, DIFF2) of the voltage signal is formed between one of the two sensor electrodes (1, 3) and the joint reference electrode (2) (FIG. 1).
1-13. (canceled)
A configuration for capacitative sensing of a rotatory motion of a rotary member, whereby the configuration has four electrodes located in one plane, an analysis unit connected to the electrodes and an electrically conducting coupling surface, which is located at the rotary member opposite to the electrodes,
A method for capacitative sensing of a rotatory motion of a rotary member with a configuration consisting of a central excitation electrode and a reference electrode and two sensor electrodes surrounding the central excitation electrode, whereby the excitation electrode, the reference electrode and the sensor electrodes are located in a plane and positioned opposite to a coupling surface provided at the rotary member, which coupling surface covers the excitation electrode and depending on the position of rotation, parts of the remaining electrodes for the capacitative coupling of the excitation electrode with the reference electrode and the two sensor electrodes, in which method the excitation electrode is charged with excitation pulses of a specified frequency, whereby the voltages of the reference electrode, the first sensor electrode and the second sensor electrode are measured, wherein the differences in voltage of the one or the other sensor electrode are formed respectively with the reference electrode and evaluated to determine the displacement and the position of rotation of the rotary member.
Dependencies are inferred from the claim text.