Angle sensor, gear wheel for an angle sensor and method for producing such a gear wheel

摘要

An angle sensor for determining a rotation angle of a rotatable body, such as a steering column in a motor vehicle, includes a gear wheel. The orientation of a magnetic field generated by the gearwheel is configured to be detected by a magnetic field sensor. The gear wheel is comprised of a magnetisable material, such as hard ferrite, into which a magnetization is introduced. The gear wheel is stronger in a central region than in an edge region in which the teeth are arranged. In order to weakly magnetize the edge region, which minimizes a negative influence of the teeth on the homogeneity of the generated magnetic field, the front face of the gear wheel is configured to be magnetized. The magnetization process advantageously takes place at the same time as an injection moulding process to form the gearwheel. A method is implemented to produce the gear wheel.

主权项

1. A toothed wheel for an angle sensor, comprising:
a wheel body; and a plurality of teeth extending from a periphery of the wheel body, wherein the wheel body and the plurality of teeth are embodied completely from a magnetizable material, and wherein at least a portion of the magnetizable material of the wheel body is magnetized and defines a level of magnetization, and wherein the level of magnetization is greater at a central region of the wheel body than at the periphery of the wheel body.