Dynamoelectric machine having reduced magnetic noise and method

Details Dynamoelectric machine having reduced magnetic noise and method Dynamoelectric machine having reduced magnetic noise and method

2006-02-03

2008-10-07

Harvey, James (Department: 2833)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S179000, C310S198000, C310S207000

Reexamination Certificate

active

07432626

ABSTRACT:
An automotive alternator including a rotor having a plurality of poles; a plurality of phases in operable communication with the plurality of poles; and a stator core in operable communication with the rotor, the stator having a number of slots defined by:in-line-formulae description="In-line Formulae" end="lead"?S=(P×PH)+((M×PH)+N)in-line-formulae description="In-line Formulae" end="tail"?where S=number of slotsP=number of polesPH=number of phasesM=a whole integer greater than or equal to 0N=a whole integer selected from a group of integers ranging from, and including, 1 through the number of phases minus 1.A method for reducing magnetic noise in an automotive alternator includes selecting a number of poles, selecting a number of phases, selecting a number of stator core slots, the foregoing selections interacting in the automotive alternator to produce an order of frequency of a tangential force different than any multiple of the number of phases and different than an order of frequency of a radial force of the alternator.

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