| 摘要 |
A rise in temperature of magneto coils can be suppressed, thereby improving the electrical efficiency, service life and reliability thereof. A flywheel ( 3 ) has a cylindrical portion ( 4 ), and is rotatable about an axis of rotation A-A. A plurality of magnets ( 7 ) are mounted on an inner peripheral surface of the flywheel ( 3 ) so as to rotate therewith. A stator core ( 10 ) has a plurality of teeth ( 12 ) protruded outwardly in a diametral direction, and is disposed in opposition to the magnets ( 7 ). Conductive wires are wound around the teeth ( 12 ), respectively, to form magneto coils ( 11 ). The stator core ( 10 ) has a laminated core ( 15 ) formed of a plurality of magnetic sheet steel plates laminated one over another, and a pair of end plates ( 16, 17 ) disposed so as to sandwich opposite side surfaces of the laminated core ( 15 ). At least one of the pair of end plates ( 16, 17 ) is made of aluminum whose heat radiation is higher than the magnetic sheet steel plates.
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