Device for rotation angle detection

A rotation angle detection system comprising:

• a magnet arranged to rotate around a rotation axis, and
• a first magnetic detection circuit defining a first surface provided with
• a first pair of magnetic detection elements arranged to be in combination sensitive to a first magnetic field in circumferential direction to said first surface and to a second magnetic field in normal direction to said first surface and arranged away from said rotation axis, and configured to detect magnetic flux of said magnet, and
• a second pair of magnetic detection elements arranged to be in combination sensitive to said first magnetic field in circumferential direction to said first surface and to said second magnetic field in normal direction to said first surface and
• a signal processing unit configured to output a signal representative of a rotation angle of said magnet based on outputs of said first pair of magnetic detection elements and said second pair of magnetic detection elements, and
• a second magnetic detection circuit provided with
• another first pair of magnetic detection elements arranged to be in combination sensitive to said first magnetic field in circumferential direction to said first surface and to said second magnetic field in normal direction to said first surface and arranged away from said rotation axis, and configured to detect magnetic flux of said magnet, and
• another second pair of magnetic detection elements arranged to be in combination sensitive to said first magnetic field in circumferential direction to said first surface and to said second magnetic field in normal direction to said first surface,
• said second magnetic detection circuit being on a same plane as said first magnetic detection circuit and arranged at a same distance as said first magnetic detection circuit from said rotation axis of said magnet,
• said signal processing unit configured to output a redundant signal corresponding to a rotation angle of said magnet based on outputs of said other first pair of magnetic detection elements and said other second pair of magnetic detection elements.