Magnet arrangement for angle detection
AssigneeInfineon Technologies AG
InventorUdo Ausserlechner
Life of this patent
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Abstract
A ring-shaped magnet arrangement for use in determining a rotational angle of a rotatable shaft. The ring-shaped magnet arrangement being connected to or formed as part of the rotatable shaft for co-rotation with the rotatable shaft around a rotational axis. The ring-shaped magnet arrangement includes a first ring portion including a first wedge surface and a second ring portion including a second wedge surface. The first wedge surface and the second wedge surface form a wedge in a sensor facing end of the ring-shaped magnet arrangement. The sensor facing end is axially opposite a radial end of the ring-shaped magnet arrangement.
Claims20
A ring-shaped magnet arrangement for use in determining a rotational angle of a rotatable shaft, the ring-shaped magnet arrangement configured to be connected to or formed as part of the rotatable shaft for co-rotation with the rotatable shaft around a rotational axis, the ring-shaped magnet arrangement comprising:
- a first ring portion comprising:
- a first wedge surface,
- wherein the first ring portion is magnetized in a first direction;
- and
- a second ring portion, that is diametrically opposite the first ring portion, the second ring portion comprising:
- a second wedge surface,
- wherein the first wedge surface and the second wedge surface form a wedge in a sensor facing end of the ring-shaped magnet arrangement, and
- wherein the second ring portion is magnetized in a second direction that is within a threshold angle of the first direction and different from the first direction,
- wherein the sensor facing end is axially opposite a radial end of the ring-shaped magnet arrangement, and
- wherein the ring-shaped magnet arrangement comprises a single piece of material with an intersecting thickness corresponding to an axial distance between the radial end of the ring-shaped magnet arrangement and a base of the wedge,
- wherein the base of the wedge extends from an outer circumferential surface of the ring-shaped magnet arrangement to an inner circumferential surface of the ring-shaped magnet arrangement.
A rotational angle detection system comprising:
- a ring-shaped magnet arrangement for use in determining a rotational angle of a rotatable shaft, the ring-shaped magnet arrangement configured to be mounted on or formed as part of the rotatable shaft for co-rotation with the rotatable shaft around a rotational axis,
- wherein the ring-shaped magnet arrangement is configured to include:
- a first ring portion magnetized in a first direction, and
- a second ring portion magnetized in a second direction that is between 120 degrees and 180 degrees from the first direction,
- wherein a first wedge surface of the first ring portion and a second wedge surface of the second ring portion form a wedge in a sensor facing end of the ring-shaped magnet arrangement, and
- the ring-shaped magnet arrangement includes an intersecting thickness corresponding to an axial distance between a base of the wedge and a radial end, of the ring-shaped magnet arrangement, that is axially opposite the sensor facing end,
- wherein the base of the wedge extends from an outer circumferential surface of the ring-shaped magnet arrangement to an inner circumferential surface of the ring-shaped magnet arrangement;
- and
- a magnetic sensor to measure the rotational angle of the rotatable shaft based on a sensed magnetic field formed from the wedge in the sensor facing end of the ring-shaped magnet arrangement.
A magnet arrangement for use in determining a rotational angle of a rotatable shaft, the magnet arrangement comprising:
- a magnet formed of a single piece of material and configured to be connected to or formed as part of the rotatable shaft for co-rotation with the rotatable shaft around a rotational axis, the magnet including:
- a first magnet portion comprising:
- a first surface,
- wherein the first magnet portion is magnetized in a first direction;
- and
- a second magnet portion, that is diametrically opposite the first magnet portion, the second magnet portion comprising:
- a second surface,
- wherein the first surface and the second surface form a wedge in a sensor facing surface of the magnet arrangement,
- wherein the second magnet portion is magnetized in a second direction that is opposite the first direction,
- wherein a sensor facing end of the magnet arrangement is axially opposite a radial end of the magnet arrangement, and
- wherein the magnet arrangement comprises an intersecting thickness corresponding to an axial distance between the radial end of the magnet arrangement and a base of the wedge,
- wherein the base of the wedge is perpendicular to the rotational axis and extends from an outer circumferential surface of the magnet arrangement to an inner circumferential surface of the magnet arrangement.
Dependencies are inferred from the claim text.