Patent ID: 7378841
Filing Date: 2008-05-27
Classification: F02D,G01D

Abstract:
1. A rotation angle detecting apparatus comprising: a first permanent magnet rotating together with a rotator; a second permanent magnet disposed so as to face said first permanent magnet, said second permanent magnet also rotating together with said rotator; an arc-shaped first magnetic member having two end surfaces fixed to South-seeking (S) pole sides of said first permanent magnet and said second permanent magnet, respectively; an arc-shaped second magnetic member having two end surfaces fixed to North-seeking (N) pole sides of said first permanent magnet and said second permanent magnet, respectively, said arc-shaped second magnetic member facing said first magnetic member; and a magnetic resistor disposed in an air gap formed between said first magnetic member and said second magnetic member so as to be axially aligned with said rotator and fixed to a non-rotator, said first magnetic member and said second magnetic member each comprising: