Position sensor, designed in particular for detecting torsion in a steering column
A position sensor, designed, in particular, for detecting torsion in a steering column, includes a first magnetized magnetic rotor structure comprising a plurality of magnets, two flux-collecting components, which define at least one air gap in which at least one magnetically sensitive element is positioned. Each collecting component has at least one primary collecting zone extended by at least one extension having at least one secondary collecting zone. The secondary collecting zones end in flattened shoes that form the two poles of the air gap. The transverse mid-plane of the air gap intersects at least one of the extensions.
1. A position sensor for detecting torsion in a steering column, comprising:
a first magnetized magnetic rotor structure comprising a plurality of magnets;
two flux-collecting components defining at least one air gap, the flux-collecting components collecting fluxes of a measured magnetic field and of an interference magnetic field, each flux-collecting component having at least one primary collecting zone extended by at least one extension having at least one secondary collecting zone, the secondary collecting zones ending with at least substantially planar axial extension portions forming a first magnetic pole and a second magnetic pole of the air gap, a transverse mid-plane of the air gap intersecting at least one of the extensions, the at least one primary collecting zone and the at least one secondary collecting zone of the two flux-collecting components being positioned respectively on either side of the transverse mid-plane such that the interference magnetic field collected by each of the two flux-collecting components is brought into the air gap in an opposing magnetic field direction from the magnetic field direction of the collecting zone, the at least one primary collecting zone of the first flux-collecting component having at least one collecting surface with a first mid-plane (PP1), the at least one primary collecting zone of the second flux-collecting component having at least one collecting surface with a second mid-plane (PP2), an at least one secondary collecting zone for creating the opposing interference magnetic field direction of the first flux-collecting component having at least one collecting surface for the first flux-collecting component having a third mid-plane (PS1), an at least one secondary collecting zone for creating the opposing interference magnetic field direction of the second flux-collecting component having at least one collecting surface for the second flux-collecting component having a fourth mid-plane (PS2), wherein the first mid-plane (PP1) is not perpendicular to the fourth mid-plane (PS2) or the second mid-plane (PP2) is not perpendicular to the third mid-plane (PS1); and
at least one magnetically sensitive element positioned in the at least one air gap.
2. The position sensor of claim 1 , further comprising at least one toothed ring positioned opposite the magnetized magnetic rotor structure.
3. The position sensor of claim 1 , wherein the transverse mid-plane of the air gap is parallel to the planes of the at least one primary collecting zones.
4. The position sensor of claim 1 , wherein the at least one primary collecting zone has an additional surface configured to collect a measured magnetic flux coming from the magnetized magnetic rotor structure.
5. The position sensor of claim 1 , wherein the at least one primary collecting zone of the first flux-collecting component has at least one additional collecting surface with a fifth mid-plane (PP1′), the at least one primary collecting zone of the second flux-collecting component has at least one additional collecting surface with a sixth mid-plane (PP2′), the at least one secondary collecting zone of the first flux-collecting component has at least one additional collecting surface with a seventh mid-plane (PS1′), and the at least one secondary collecting zone of the second flux-collecting component has at least one additional collecting surface with an eighth mid-plane (PS2′), wherein the fifth mid-plane PP1′ is not perpendicular to the eight mid-plane (PS2′) or the sixth mid-plane (PP2′) is not perpendicular to the eighth mid-plane (PS2′).
6. The position sensor of claim 1 , wherein the extension extends axially and perpendicular to the plane of the at least one primary collecting zone beyond the transverse mid-plane of the air gap.
7. The position sensor of claim 1 , wherein a total area of the secondary collecting zone is equal to a total area of the at least one primary collecting zone.
8. A device for detecting an absolute position of a steering column, comprising a torsion sensor including:
a first magnetized magnetic rotor structure comprising a plurality of magnets;
two flux-collecting components, which define at least one air gap, the flux-collecting components collecting fluxes of a measured magnetic field and of an interference magnetic field, each collecting component having at least one primary collecting zone extended by at least one extension having at least one secondary collecting zone, the secondary collecting zones ending in at least substantially planar axial extension portions forming a first magnetic pole and a second magnetic pole of the air gap, the at least one primary collecting zone and the at least one secondary collecting zone of the two flux-collecting components being positioned respectively on either side of a transverse mid-plane of the at last one air gap intersecting at least one of the extensions across the air gap and each of the collecting components extending past the intersection to create secondary collecting zones for creating the opposing interference magnetic field direction such that the interference magnetic field collected by each of the two flux-collecting components is brought into the air gap in opposing magnetic field directions; and
at least one magnetically sensitive element positioned in the at least one air gap.