| 摘要 |
PURPOSE: To reduce leakage flux and increase the cooling capability of a magnet by providing the magnet reducing the leakage flux of both pole side surfaces adjacent to first and second pole cores having pawl-shaped poles engaging mutually, and a retaining member of dissipating the conductive heat of the pole in a position where the outer periphery of a rotor coil generating the flux is covered. CONSTITUTION: Two polarized ferrite magnets 30 reducing the leakage flux of both pawl-shaped poles 23, 24 are disposed on both side surfaces of each pawl-shaped pole 23, 24 so as to come into contact therewith. The pawl-shaped poles 23, 24 are retained by a retaining member 40 which serves as a heat sink and is formed into a cross-sectional C-shape to cover the magnet 30 from the inner peripheral surface of the pawl-shaped poles 23, 24. The curved parts of retaining members 40, 40 forming an exposure part 41 which is parallel with an axial direction and opens toward a outer diameter side are spaced from each other, and a gap 50 through which cooling air passes is formed therebetween. Heat generated during generation is transferred to a base through the cylindrical parts of pole core bodies 21, 22, and the conductive heat circularly expanding in the base is transferred to the pawl-shaped poles 23, 24.
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