Magnet arrangement for angle detection

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;
• 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 the sensor facing end 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.