Siemens, along with its partner BMW, recently concluded a feasibility study that focused on inductive charging of passenger electric vehicles. The objective of the study was to verify that automatic wireless charging could be accomplished with a comparable level of efficiency to today's conductive solutions and without impact to human or vehicle safety. In its first phase, the study began with testing of a non-vehicle integrated solution. After verification of KPIs, the second phase of the study proceeded to integrate the technology into two BMW ActiveE electric vehicles. The study specifically measured power transfer efficiency with varying levels of coil to coil air gaps and misalignments between the road side and in-car coils while observing the most influential factors. Key findings of the study were that two areas merited further focus - the design of the coil system and the necessity for air gap observation. It is clear that as the automotive OEM community continues to seek inductive solutions that are smaller, lighter, more efficient, and less costly, these areas along with positioning guidance technology will be critical topics of further research. Siemens is using the results of the study to enhance their 2nd generation prototype which seeks to significantly reduce the size and weight of the inductive coils while adding in compliances and certifications to in-car safety and quality standards. There were two overarching takeaways from the research project. First, coil design is extremely critical. OEMs will demand the smallest and lightest coils possible. The smaller coils will have undesirable side effects and they will be harder to position the coils, meaning misalignment will play a much larger role. Differences in coil to coil distance are not so important and can be overcome with automatic adjustments in power electronics. We anticipate that the end result of these conclusions is the creation of a design guideline that educates the OEM on the array of effects that varying designs will have on both performance and cost. Second, the 60cm diameter system such as the one used for this initial study does not generate a strong magnetic field and therefore no intense heating of objects between the coils. This means that foreign objects entering the air gap during the charging process are not at risk. However, future versions of the system that attempt to reduce the size and weight will result in more compact coils. This in turn will increase the field strength and the probability of more intense heating of foreign objects between the coils, another undesirable side effect. Therefore, we will also need a foreign object observation system because it is likely that objects may enter into the field such as drifting or blowing debris, organic materials etc. and will become heated, possibly causing harm to humans and other creatures.


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    Titel :

    Inductive charging - simplifying the charge to enable mass adoption


    Beteiligte:
    Kluth, Richard (Autor:in) / Ziegner, Jochen (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2012


    Format / Umfang :

    8 Seiten, 11 Bilder, 1 Quelle



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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