Patent ID: 6483296
Filing Date: 2002-11-19
Classification: F02D,G01D

Abstract:
An angular position detection apparatus comprising:a rotor core mounted for rotating in response to rotation of a detection target object; a permanent magnet fixed to the rotor core; a stator core concentrically arranged with respect to the rotor core; and a magnetic detection element disposed at a magnetic flux detection gap formed in the stator core for outputting a signal in response to magnetic flux going through the magnetic flux detection gap, wherein angular position of the detection target object is detected based on an output from the magnetic detection element, the permanent magnet being fixed to a side portion of the rotor core and a cylindrical portion thereof for closely confronting an outer surface of the stator core at a radial gap in which magnetic flux goes through an air gap between an inner surface of the cylindrical portion and an outer surface of the stator core, and the permanent magnet is magnetized so that lines of magnetic force in the permanent magnet are parallel with respect to each other.