JP2011052985A5 - Rotation angle detection device, steering shaft of vehicle and vehicle - Google Patents

Claims (9)

A magnet holder rotatably supported while being axially displaced while being interlocked with rotation of a rotating body in a housing, and a magnet disposed on an end face of the magnet holder radially offset with respect to the rotation axis of the magnet holder; A magnetism detector installed opposite to the magnet on an axis center extension line of the magnet holder rotation axis, and a rotation angle calculation unit processing an output signal of the magnetism detector to detect a rotation angle of the rotor , And
The magnet and the magnetic detector are respectively one, and the rotation angle calculation unit calculates the output of the magnetic detector to calculate the rotation angle of the rotating body of 360 degrees or less or the rotation angle of the rotating body of more than 360 degrees. A rotation angle detection device characterized by detecting a rotation angle of The rotation angle detection device according to claim 1, wherein the magnet has a substantially cylindrical shape magnetized in the axial direction to an NS 2 pole . The magnetic detector directly detects changes in magnetic flux density in three directions of an X axis, a Y axis, which is a radial direction plane of the magnet holder facing the magnetic detector, and a Z axis, which is an axial direction of the magnet holder. The rotation angle detection device according to claim 1 or 2, wherein the rotation angle detection device is a Hall IC capable of The rotation angle detection device according to any one of claims 1 to 3 , wherein a ball screw mechanism is used for axial displacement accompanying rotation of the magnet holder . The rotation angle detection device according to any one of claims 1 to 4, wherein the magnet is disposed such that an N pole always faces the magnetic detector .   The rotation angle detection device according to any one of claims 1 to 5, wherein the housing comprises a magnetic shield.   The rotation angle detection device according to any one of claims 1 to 6, wherein the rotating body is a steering shaft of a vehicle. A steering shaft of a vehicle comprising the rotation angle detection device according to any one of claims 1 to 7. A vehicle comprising the rotation angle detection device according to any one of claims 1 to 7.