| 摘要 |
A Lundell type rotor of an alternator has a pole core disposed on an outer side of a field coil in a radial direction of the rotor, and a non-magnetic claw pole joint ring. The pole core has claw poles disposed along a circumferential direction of the rotor at predetermined intervals. Each claw pole extends along an axial direction of the rotor and is magnetized in response to an electric current supplied to the field coil. The joint ring is formed by spirally bending a long band bar in a coil shape and has turn portions disposed along the axial direction. Each turn portion of the joint ring has no seams and is attached to inner side surfaces of the claw poles in the radial direction.
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