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US 10,950,377 B2Granted
Rotary encoder with shielded magnet
AssigneeInfineon Technologies AG
InventorUdo Ausserlechner
Life of this patent
Estimating the term…
Abstract
A magnetic set-up for use in a rotary encoder is disclosed. The set-up includes a permanent magnet arrangement including at least one permanent magnet, which is rotatable with respect to a rotation axis, and a soft magnetic sleeve encompassing the rotation axis and thus the permanent magnet arrangement for shielding against external magnetic fields. The at least one permanent magnet includes a through-hole, which extends along the rotation axis, so that the permanent magnet fully extends around the rotation axis.
Claims16
A rotary encoder, comprising:
- a permanent magnet arrangement including at least one permanent magnet, which is rotatable with respect to a rotation axis;
- a soft magnetic sleeve encompassing the rotation axis and thus the permanent magnet arrangement for shielding against external magnetic fields;
- a shaft, which is rotatable with respect to a rotation axis and mechanically coupled to the permanent magnet arrangement to ensure a common rotation,
- wherein the at least one permanent magnet includes a through-hole, which extends along the rotation axis, so that the permanent magnet fully extends around the rotation axis, and
- wherein the soft magnetic sleeve is slipped over a longitudinally extending portion of the shaft, wherein the longitudinally extending portion has a uniform cross-section, and
- wherein the shaft is adjoined to the permanent magnet arrangement;
- and
- a magnetic field sensor to measure a magnetic field associated with the permanent magnet arrangement.
5 more elements
A rotary encoder, comprising:
- a permanent magnet arrangement including at least one permanent magnet, which is rotatable with respect to a rotation axis;
- a soft magnetic sleeve encompassing the rotation axis and thus the permanent magnet arrangement for shielding against external magnetic fields;
- wherein the at least one permanent magnet includes a through-hole, which extends along the rotation axis, so that the permanent magnet fully extends around the rotation axis,
- wherein the sleeve has a collar, which is inwardly bent to the rotation axis, and wherein a front side of the permanent magnet arrangement adjoins a back side of the collar, and
- a magnetic field sensor to measure a magnetic field associated with the permanent magnet arrangement.
2 more elements
A rotary encoder comprising:
- a permanent magnet arrangement including at least one permanent magnet, which is rotatable with respect to a rotation axis and includes a through-hole, which extends along the rotation axis, so that the permanent magnet fully extends around the rotation axis;
- a soft magnetic sleeve encompassing the rotation axis and thus the permanent magnet arrangement for shielding external magnetic fields;
- a shaft, which is rotatable with respect to the rotation axis and adjoined to the permanent magnet arrangement to ensure a common rotation, and
- a magnetic field sensor located within the through-hole on the rotation axis,
- wherein the permanent magnet arrangement is substantially symmetric with respect to a symmetry plane, to which the rotation axis is perpendicular, and
- wherein the magnetic field sensor is located at the intersection of the symmetry plane and the rotation axis.
3 more elements
Dependencies are inferred from the claim text.