Non-contact rotation angle detecting sensor

Abstract From the Canadian patent

A stationary yoke surrounds an outer peripheral surface of a ring-shaped permanent magnet in a certain distance. The ring-shaped permanent magnet is fixed to a rotor and has two poles of N, S poles in a diameter direction. The stationary yoke includes a first outside yoke and a second outside yoke overlapped in an axial direction and a Hall-element is disposed in a gap of the first outside yoke. An axial height of the first outside yoke changes along the circumferential direction and a height of the second outside yoke has a complementary relation with the height of the first outside yoke and the , first outside yoke and the second outside yoke are overlapped in a certain …