| 摘要 |
A rotor of an AC generator includes a field coil, a pole core having a plurality of claw poles disposed in the circumferential direction to enclose the field coil to provide a plurality of magnetic fields when the field coil is energized and a cylindrical permanent magnet disposed inside the plurality of claw poles to supplement the plurality of magnetic fields. The cylindrical permanent magnet is easy to orient magnetic character so that strong magnetic field can be provided at a low cost.
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