First of all this paper shows the typical consumption of energy of different transport systems and it answer the question what environment-friendly mobility means. Secondly it presents an electric vehicle on one wheel which has an energy consumption of less than doing a walk. This funny one-wheeler is powered by a three-phase electric drive system and stabilized by an observer-based gravity control. As four-quadrant electric drives are able to correct the tut angle nearly one hundred times a second this smart vehicle can stand absolutely alone just like ghostly balanced. Unicycles are useable by kids, trendy people and creative workers during short trips in all areas of leisure, home, school, office, super markets, airports and cities. Conventional unicycles are mostly known from circus arenas because they can be used only by people with a lot of skill and experience. The reason is that unicycles are unstable in all directions. In order to stabilize these one-wheelers automatically and make they useable for all people there are two steps of modification necessary. First a proper stabilization in sideways directions can be reached easily by changing from a small to a broad wheel. A further advantage of this first modification is a good steering of the vehicle because of the stiffness of a broad air-filled rubber wheel. A second development step requires a gravity-controlled high-dynamical electric drive which guarantees the automatically stabilization in forward and backward directions. The presented electric vehicle is powered by a four-quadrant dc-servo drive consisting of a permanent exited dc-motor and a 4q-chopper converter. The control of gravitation, speed and torque is done by an observer-based cascade structure which stabilizes the unicycle automatically and places the driver's position in such a way that the centre of gravity is always above the axle of the wheel. A forward or backward drive can be initiated by a slightly shift of the driver in forward or backward direction. That means this electric vehicle is driven, steered and broken only by body movements as the driver is subordinated to the inner speed and torque control.


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    Titel :

    Environment-friendly transportation


    Beteiligte:
    Hofer, K. (Autor:in)


    Erscheinungsdatum :

    2013


    Format / Umfang :

    5 Seiten, 6 Bilder, 3 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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