An extensive experimental study of noise generating mechanisms of two production models of automotive alternators is presented. It was established that aerodynamic noise (generated by cooling fans) is dominating at high speeds (above 3,000 rpm), while electromagnetic noise is the most intensive at low rpm. Two directions of noise reduction are proposed and validated: reduction of noise levels generated by alternators to be achieved by using axial flow fans for cooling instead of presently used bladed discs, and radical reduction of operating speed of alternators by using variable transmission ratio accessory drives.


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    Title :

    Noise Analysis of Automotive Alternators


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Noise & Vibration Conference & Exposition ; 1999



    Publication date :

    1999-05-17




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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