Patent ID: 8111064
Filing Date: 2012-02-07
Classification: G01D

Abstract:
1. A magnetic rotational angle transducer, comprising: a first and second Hall sensors which can rotate around a rotational axis, wherein the first and second Hall sensors are arranged offset with respect to the rotational axis, a pair of circular segment-shaped permanent magnets arranged around the rotational axis for forming a magnetic field with a specific configuration, each circular segment-shaped permanent magnet having a pair of elongated curved side walls extending between a pair of end walls, each elongated curved side wall extending through an angle of less than 180 degrees between the pair of end walls, wherein two main directions of the first and second Hall sensors, respectively are each located radially and axially with respect to the rotational axis and in a central position parallel to field lines of the magnetic field in this central position, wherein the first Hall sensor is offset from the rotational axis toward the first circular segment-shaped permanent magnet, and the second Hall sensor is arranged mirror-symmetrically with respect to the first Hall sensor, offset from the rotational axis toward the second circular segment-shaped permanent magnet; wherein adjacent end walls of the two circular segment-shaped permanent magnets are spaced apart from each other and define a pair of gaps, and wherein the adjacent end walls defining each gap extend parallel to each another.