Patent ID: 6617717
Filing Date: 2003-09-09
Classification: H02K

Abstract:
An alternator, comprising:a stator having stator coils wound thereon; a rotor having a plurality of claw-pole pieces, the rotor being disposed to be rotatable in an inner periphery of the stator; and a cooling fan having a plurality of diagonal-flow-type blades for blowing cooling air in axial and radial directions of the rotor, wherein: one of a number of the claw-pole pieces and a number of the diagonal-flow-type blades is indivisible by the other, and both of the numbers have no common divisor other than one, the cooling fan further comprises a plurality of centrifugal-flow-type blades for blowing cooling air in the radial direction of the rotor, and one of the number of claw-pole pieces and the number of centrifugal-flow-type blades is indivisible by the other, and both of the numbers have no common divisor other than one.