Patent ID: 6423264
Filing Date: 2002-07-23
Classification: B22F,H01F,H02K,Y10T

Abstract:
A method of manufacturing a rotating electromagnetic body having regions of dissimilar magnetic properties, the method comprising the steps of:compacting a soft magnet powder material and a permanent magnet material to form the rotating electromagnetic body containing at least one soft magnet region of the soft magnet powder material and at least one hard magnet region of the permanent magnet material, the soft magnet powder material having a sintering temperature at which particles of the soft magnet powder material fully sinter together, the permanent magnet material exhibiting magnetic anisotropy, having an amorphous noncrystalline metallurgical structure, and having a degradation temperature below the sintering temperature of the soft magnet powder material and at which permanent magnetic properties of the permanent magnet material are destroyed; and then partially sintering the rotating electromagnetic body at a temperature of less than the degradation temperature to at least partially fuse the soft magnet powder materials with the permanent magnet material so that the density of the rotating electromagnetic body is approximately equal to that of the rotating electromagnetic body if it were fully sintered.