Position encoder and a method for detecting the position of a movable part of a machine
AssigneeVogt Electronic Components GmbH
InventorsFranz Straubinger, Josef Bartl
Life of this patent
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Abstract
A rotation angle detection sensor system for a rotational body is provided, which has a reduced sensitivity against an interfering magnetic field and an interfering electric field. The rotation angle detection sensor system comprises an encoder structure that is attached to the rotational body of a machine and is movable along with this rotational body. A stationary sensor assembly is positioned opposite to this encoder structure and supplies at least one sensor signal for determining the angle position. The sensor assembly includes a first inductive element, the inductance of which is dependent on the angle position of the encoder structure.
Claims29
A system for detecting the position of a rotor of a machine, the system comprising an encoder structure attached to the rotor and moveable together with the rotor, and a stationary sensor assembly positioned opposite to the encoder structure and providing at least one sensor signal, from which the position may be determined,
- wherein the sensor assembly comprises a planar-shaped first inductive component and is configured to generate a magnetic field and detect the generated magnetic field, the generated magnetic field being affected by the encoder structure, and the encoder structure is configured to cause a position dependent change of inductance of the inductive component,
- wherein a core-free portion of said first inductive coil component has a width extending along a direction of motion of said encoder structure and a length extending perpendicular to said width, wherein said width is less than said length and wherein said length is greater than a maximum width of an encoder on said encoder structure, and
- wherein the encoder structure comprises an electrically conductive material having a width periodically changing with respect to an angular position.
A rotation angle detection sensor system comprising:
- a rotational body;
- an encoder structure that is attached rotatably along with said rotational body;
- and
- a stationary sensor assembly that has at least one or more inductance elements and that is disposed in a manner opposing to said encoder structure while having an interval thereto, wherein the stationary sensor assembly is configured to generate a magnetic field and detect the generated magnetic field, the generated magnetic field being affected by the encoder structure,
- wherein said one or more inductance elements are formed into a planar shape,
- wherein a core-free portion of said inductance elements has a width extending along a direction of motion of said encoder structure and a length extending perpendicular to said width, wherein said width is less that said length and wherein said length is greater than maximum width of an encoder trace formed on said encoder structure, and
- wherein the encoder structure comprises an electrically conductive material having a width periodically changing with respect to an angular position.
Dependencies are inferred from the claim text.