| 摘要 |
PROBLEM TO BE SOLVED: To classify nonferrous metal materials having smaller diameters, by arranging magnetic lines of force generated from a first permanent magnet element to turn toward the radius direction of a rotor, and arranging magnetic lines so that they may repel the magnetic lines of force generated from a second permanent magnet element to efficiently turn toward the outside of the rotor. SOLUTION: A magnet element 23 consists of a first permanent magnet element 24 in the shape of a square hexahedron and a second permanent magnet element 25 in the shape of a hexahedral trapezoid. The magnet element 24 is disposed in the shaft direction of a rotor. The magnet elements 24 is arranged so that its magnetic poles turn toward the outside from the center of the rotor along the radius direction. As for the magnetic poles turning toward the outside of one line of the magnet element 24, they are arranged alternately, as N-pole S-pole, N-pole,.... Each of the magnet element 25 is disposed between the lines of the magnet elements 24. The magnetic poles of each magnet element 25 are arranged to turn toward the same magnetic poles of each magnet element 24. In such arrangement, magnetic lines of force generated from the magnet element 24 repels magnetic lines of force generated from the magnet element 25 to efficiently turn toward the outside of the rotor. |
