| 摘要 |
PROBLEM TO BE SOLVED: To provide a radial orientation magnetic field forming apparatus capable of suppressing cogging torque during motor rotation while keeping high torque intact and of forming a highly reliable long annular bond magnet. SOLUTION: The radial orientation magnetic field forming apparatus is configured such that a mixture 5 of magnetic powder and resin is filled between a central core rod 4B and annular dices 1 disposed around the core rod 4B, to form a magnetic field directed outward radially from the center of the dices 1 after passage through the core rod 4B, and in this state the mixture 5 is pressurized into a bond magnet. In the apparatus, the dices 1 are constructed by alternately arranging peripherally a dice piece 1A of a ferromagnetic material and a dice piece 1B of a non-magnetic material. COPYRIGHT: (C)2007,JPO&INPIT
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