Analog sensor for contact-free angular offset sensing
First Claim
1. A contactless analog sensor of angular offset, comprising:
- a first portion forming a detector, comprising at least one substrate plate carrying at least one flat spiral winding, at least one core layer of a material of high magnetic permeability and low saturation field, on at least a portion of said winding, the detector being adapted to coact with a device for processing the electric signal measured at the terminals of the winding, two rotors each comprising at least one magnet, disposed along a predetermined angular sector, the rotors being movable about a same axis identical to the axis of the winding, each magnet generating in the plane of the core layer a magnetic field of a value greater than the saturation field of said core layer over at least a portion of the surface of the winding, wherein the detector comprises two core layers on opposite sides of the winding.
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Accused Products
Abstract
A contactless angular offset analog sensor, of the magnetic inductance type, includes a first portion forming a detector. The detector includes at least one substrate plate carrying at least one flat spiral winding, and at least one core layer of material with high magnetic permeability and low saturation field over at least one portion of the winding. The detector is adapted to coact with a device for processing the electrical signal measured at the terminals of the winding. The sensor also includes two rotors each having at least one magnet, disposed over a predetermined angular sector. The rotors are movable about a same axis identical to the axis of the winding. Each magnet generates in the plane of the core layer a magnetic field of a value greater than the saturation field of the core layer over at least a portion of the surface of the winding.
17 Citations
12 Claims
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1. A contactless analog sensor of angular offset, comprising:
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a first portion forming a detector, comprising at least one substrate plate carrying at least one flat spiral winding, at least one core layer of a material of high magnetic permeability and low saturation field, on at least a portion of said winding, the detector being adapted to coact with a device for processing the electric signal measured at the terminals of the winding, two rotors each comprising at least one magnet, disposed along a predetermined angular sector, the rotors being movable about a same axis identical to the axis of the winding, each magnet generating in the plane of the core layer a magnetic field of a value greater than the saturation field of said core layer over at least a portion of the surface of the winding, wherein the detector comprises two core layers on opposite sides of the winding. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9)
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4. A contactless analog sensor of angular offset, comprising:
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a first portion forming a detector, comprising at least one substrate plate carrying at least one flat spiral winding, at least one core layer of a material of high magnetic permeability and low saturation field, on at least a portion of said winding, the detector being adapted to coact with a device for processing the electric signal measured at the terminals of the winding, two rotors each comprising at least one magnet, disposed along a predetermined angular sector, the rotors being movable about a same axis identical to the axis of the winding, each magnet generating in the plane of the core layer a magnetic field of a value greater than the saturation field of said core layer over at least a portion of the surface of the winding, wherein the detector comprises two windings disposed on opposite sides of a single core layer, one of the windings is connected to an alternating voltage generator and the other to a voltage measuring device.
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10. A contactless analog sensor of angular offset, comprising:
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a detector having at least one substrate plate carrying at least one flat spiral winding, and at least one core layer having a magnetic permeability of about 100,000 times a magnetic permeability of air on at least a portion of said winding;
a device for processing an electric signal connected to terminals of the winding; and
two rotors, each of said two rotors having at least one magnet, disposed along a predetermined angular sector, the rotors being movable about a same axis identical to an axis of the winding, wherein the at least one flat spiral winding, the at least one core layer, and the at least one magnet are structured and arranged so that when each said magnet passes over the at least one core layer, a magnetic field of the magnet causes a local saturation of the at least one core layer, so that an inductance of the at least one core layer at an area of said local saturation decreases. - View Dependent Claims (11, 12)
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Specification