| 摘要 |
PROBLEM TO BE SOLVED: To obtain a rotor assembly for rotors that concurrently can drastically reduce the overall weight and has improved starting characteristics, at the same time can reduce manufacturing cost and mold cost. SOLUTION: A rotor magnet is provided with a shaft 10 that is supported rotatably by a casing 1, a support member 11 that is fixed to one portion of the outer periphery of the shaft 10 and is extended in the diametrical direction, and an annular rotor magnet 12 that is fixed to the outer periphery of the support member 11 and is provided via the gap with a yoke 2, where an excitation coil 6 is wound.
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