A small motor

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PROBLEM TO BE SOLVED : To provide a magnet with high performance and a microminiature motor. SOLUTION : By diffusing rare earth metal into a magnet surface deterioratedly damaged by machining of the rare earth metal, the magnet surface is reformed. Using the reformed magnet, the motor is manufactured by setting a permeance coefficient (an operating point) to ≥1, specific surface area (surface area/volume) to ≥4 mm-1, and the volume of the magnet to ≤10 mm3. COPYRIGHT : (C)2005, JPO&NCIPI