Device for determining the spatial position of a sensor element which is displacement relative to a reference element
First Claim
1. A device for determining the spatial position of a sensor element which is spatially displaceable relative to a reference element, comprising:
- three sensor element coils which are arranged in the sensor element, consist of at least one wire turn and are wound about a common center;
at least three reference element coils which are arranged in the reference element spaced apart from each other and consist of at least one wire turn, said reference element coils all facing in substantially the same direction;
a current generator for exciting the sensor element coils or the reference element coils by means of a presettable excitation alternating current;
a processing circuit for voltages induced in the reference element coils in response to the current generator exciting the sensor element coils or in the sensor element coils in response to the current generator exciting the reference element coils, which processing circuit comprises an arithmetic circuit that calculates, on the basis of the induced voltages, distance coordinates xm, ym, and zm of the center of the sensor element coils in a coordinate system associated with the reference element; and
a feedback circuit which controls the excitation currents in dependence on the amplitude of the induced voltages.
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Abstract
A device for determining the spatial position of a sensor element (3) which is spatially displaceable relative to a reference element (1), includes three coils (4, 5, 6) which are arranged in the sensor element (3), consist of at least one wire turn, and are wound about a common center (7), at least three coils (2) which are arranged in the reference element (1) in spatially remote positions and consist of at least one wire turn, a current generator (11) for exciting the sensor element coils (4, 5 6) or the reference element coils (2) by means of a presettable excitation alternating current, and a processing circuit (15) for the voltages induced in the reference element coils (2) or in the sensor element coils (4, 5, 6). The processing circuit includes an arithmetic circuit which calculates, on the basis of the induced voltages, the distance coordinates xm, ym and zm of the center (7) of the sensor element coils (4, 5, 6) in a coordinate system associated with the reference element (1), as well as a feedback circuit (13) which controls the excitation currents in dependence on the amplitude of the induced voltages.
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Citations
19 Claims
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1. A device for determining the spatial position of a sensor element which is spatially displaceable relative to a reference element, comprising:
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three sensor element coils which are arranged in the sensor element, consist of at least one wire turn and are wound about a common center; at least three reference element coils which are arranged in the reference element spaced apart from each other and consist of at least one wire turn, said reference element coils all facing in substantially the same direction; a current generator for exciting the sensor element coils or the reference element coils by means of a presettable excitation alternating current; a processing circuit for voltages induced in the reference element coils in response to the current generator exciting the sensor element coils or in the sensor element coils in response to the current generator exciting the reference element coils, which processing circuit comprises an arithmetic circuit that calculates, on the basis of the induced voltages, distance coordinates xm, ym, and zm of the center of the sensor element coils in a coordinate system associated with the reference element; and a feedback circuit which controls the excitation currents in dependence on the amplitude of the induced voltages. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 14, 15, 16, 17)
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- 11. A device as claimed in claim characterized in wherein the current generator is connected, via a multiplexer, to the sensor element coils, acting as excitation coils, or to the reference element coils, and that the excitation coils can be excited successively in time by currents of the same frequency.
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18. A device for determining the spatial position of a sensor element which is spatially displaceable relative to a reference element, the reference element forming a boundary plane, comprising:
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three sensor element coils which are arranged in the sensor element, consist of at least one wire turn and are wound about a common center; at least three reference element coils placed about the boundary plane at a maximumly large distance relative to each other and consist of at least one wire turn, said reference element coils all facing in substantially the same direction; a current generator for exciting the sensor element coils or the reference element coils by means of a presettable excitation alternating current; a processing circuit for voltages induced in the reference element coils in response to the current generator exciting the sensor element coils or in the sensor element coils in response to the current generator exciting the reference element coils, which processing circuit comprises an arithmetic circuit that calculates, on the basis of the induced voltages, distance coordinates xm, ym, and zm of the center of the sensor element coils in a coordinate system associated with the reference element; and a feedback circuit which controls the excitation currents in dependence on the amplitude of the induced voltages. - View Dependent Claims (19)
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Specification