Radially anisotropic ring magnets and method of manufacture

Abstract

A radially anisotropic ring magnet endowed with good magnetic characteristics and having throughout the magnet an angle of 80 to 100° between a center axis thereof and a radial anisotropy imparting direction is manufactured by a pressing operation.

1 . A radially anisotropic ring magnet characterized by having throughout the magnet an angle of 80 to 100° between a center axis thereof and a radial anisotropy imparting direction.  
   
   
       2 . The radially anisotropic ring magnet of  claim 1  which is characterized by having, on a plane perpendicular to the center axis thereof, a magnet powder average degree of orientation with respect to the radial direction of at least 80%.  
   
   
       3 . The radially anisotropic ring magnet of  claim 1  or  2  which is characterized by having a length in the direction of the center axis and an inside diameter such that the length divided by the inside diameter is at least 0.5.