Rotation angle sensing device having extended detectable angle range

摘要

The device has two main magnets with one magnet fixed in a stator (2) and another magnet fixed in a rotor (1). Hall ICs (6) detect magnetic force of the magnets. A supportive magnet (8) is placed between the hall ICs to offset the magnetic flux of the magnets. A magnetic concentration gap (9) is formed between the rotor and the stator which becomes smaller in a predetermined direction.