Patent ID: 7592889

Claim:
An alignment process apparatus for manufacturing, by molding using a die, a hollow cylindrical-shaped anisotropic bonded magnet for use in a 4-pole motor, the magnet being formed by molding anisotropic rare-earth magnet powder with resin, wherein the alignment process apparatus comprises: a core comprising a column-shaped magnetic body provided in a die molding space; a cavity of width 0.7 to 3mm for filling with the anisotropic bonded magnet raw material and molding the magnet, the cavity being formed in a cylindrical shape on the outer periphery of die core; No. 1 one dice, comprising of a magnetic body divided into quarters forming an aligning magnetic field in the normalized direction of the cavity, disposed on the outer periphery of the core and facing the center of the core; No. 2 two dice divided into quarters, comprising a non-magnetic body disposed on the outer periphery of the core and facing the center of the core, and, corresponding to the transition region in which the direction of the magnetic poles of the bonded magnet changes, located between the adjacent No. 1 dice; coils conferring magnetic flux on the four No. 1 dice; and a magnetic flux induction member comprising a thin-walled cylindrical magnetic body which forms the outer peripheral surface of the cavity.