Patent ID: 7592735
Filing Date: 2009-09-22
Classification: H02K

Abstract:
1. An alternator comprising: a stationary iron core fixed to a housing of the alternator; a stationary field coil, wound around the stationary iron core, which receives an electric current; and a Lundell type rotor, comprising: a rotational shaft, rotatable in response to a rotational force; a pole core that is fixed to the rotational shaft on an outer side of the field coil in a radial direction of the rotor and has a plurality of claw poles disposed along a circumferential direction of the rotor at predetermined intervals, each of the claw poles extending along an axial direction of the rotor, the claw poles being magnetized in response to the electric current of the field coil such that a magnetic polarity is changed every claw pole; and a non-magnetic claw pole joint ring which is attached to the inner side surfaces of the claw poles in the radial direction, wherein the claw pole joint ring has a plurality of turn portions substantially disposed along the axial direction so as to be formed in a coil shape, and each of the turn portions is attached to the inner side surfaces of the claw poles, and wherein the turn portions of the claw pole joint ring are in contact with one another in the axial direction.