Fractional slot tooth concentrated windings are characterized by high space harmonics which result in undesirable effects on electric machine, such as localized core saturation, additional losses in stator, rotor, magnets, and noise and vibration. In this paper different cost effective and high efficiency solutions for improving the performances of concentrated windings are presented; 1). Reduction of sub-harmonics: Using coils with different turns per coil side, using flux barriers in the stator core (yoke). 2). Reduction of sub- and high harmonics simultaneously: Increasing the number of stator slots, using two winding systems shifted to each other for a specific angle, using stator core with different tooth width and using different turns per coil for the neighbouring phase coils. According to the proposed new techniques different electric machines for automotive application are designed and prototype machines are built. It is important to underline here that the presented techniques are applied to the 12-teeth/10-poles winding, however, of course these techniques are also applicable to any concentrated winding topology. Further, the new presented windings are applicable also to other machine topologies, like induction machines and electrically excited synchronous machines.


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    Title :

    Efficiency improvements of electric machines for automotive application


    Contributors:

    Published in:

    Publication date :

    2012


    Size :

    7 Seiten, 20 Bilder, 1 Tabelle, 11 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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