Patent ID: 7501812
Filing Date: 2009-03-10
Classification: F16C,G01D,G01P

Abstract:
1. A method of magnetizing a ring-shaped to-be-detected member of a rotation sensor unit, using a magnetizing yoke assembly of a structure having a pair of yoke arms having respective end faces curved arcuately with a space left between those end faces, the method comprising: positioning the to-be-detected member with a ring center thereof aligned with an imaginary line connecting between respective centers of curvature of the curved end faces of the yoke arms; fixing the to-be-detected member with opposite sides of the to-be-detected member spaced an equal distance from the adjacent free end faces; and magnetizing the to-be-detected member, wherein each of the curved end faces of the yoke arms has a radius Ry of curvature, which is larger than a radius Re of the to-be-detected member and is within the range of 2×Re≦Ry≦3×Re.