Alternator
AssigneeDenso Corporation
InventorGoroku Okawa
Life of this patent
Estimating the term…
Abstract
In an alternator, a pole core has a plurality of claw-pole pieces, and a cooling fan has a plurality of diagonal-flow-type blades and a plurality of centrifugal-flow-type blades. A combination of numbers of the claw-pole pieces and the diagonal-flow-type blades is determined to suppress an interference of wind noises caused by the claw-pole pieces and the diagonal-flow-type blades during operation, such that one of the numbers of the claw-pole pieces and the diagonal-flow-type blades is not divisible by the other and both numbers have no common divisor other than one. Further, a number of the centrifugal-flow-type blades is determined not to be divisible by the numbers of the diagonal-flow-type blades and the claw-pole pieces, and all the three numbers have no common divisor other than one.
Claims6
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.
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 and a plurality of centrifugal-flow-type blades for blowing cooling air in the radial direction of the rotor, wherein 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.
Dependencies are inferred from the claim text.