With significant advance of rare earth permanent magnets (REPM) and power electronic components in the last two decades REPM motor drives have gradually been integrated into various automotive applications. Those include electric traction and propulsion, various X-by-wire and other electromechanical systems. REPM traction motors for electric propulsion and REPM motor drives for electric power steering (EPS) applications, just to name a few, are successful commercial examples in today's automotive marketplace for mass production. In spite of many perceived benefits, for instance reduction of weight and CO2 emission, automotive REPM drive manufacturers have today to face high manufacturing costs, due primarily to a recent tremendous price increase of REPM. In this paper, permanent magnet design technology is reviewed, which covers the main PM categories with key features. The aim is to provide a fundamental guideline for material selection. Furthermore, synthesis, design and optimization of magnetic circuits of magnet rotors for different permanent magnet motor topologies are discussed. For electric motors in automotive applications it is of great importance to minimize the cost without compromising the motors' performance, overall reliability and stability with respect to demagnetization. A number of innovative magnetic circuit design examples are revealled in this report, demonstrating how to handle different types of motor topologies and which kind of magnet should be used for. The major findings of this report can be summed up as follows: 1) Recent sharp price spike of rare earth magnets has a farreaching impact on the automotive motor and drive manufacturers worldwide. 2) Due to further technical advancements and continuous developments, sustainable availability and relatively stable price, high performance ferrite magnets, with both Br and Hcj approaching 500 mT and 400 KA/m at room temperature respectively, will be prioritized as the first consideration for future automotive motor developments. 3) Dy- and Tb-free NdFeB magnets could find their ways to some critical automotive applications like traction motors for EV and HEV. 4) It is imperative to perform detailed analyses and to validate demagnetization of permanent magnets to be used under various conditions, in an attempt to avoid any possible demagnetization which affects motor performance, stability and reliability. 5) Novel cost-effective permanent magnetic flux generation techniques by synthesizing and designing innovative magnetic circuits could further extend automotive permanent magnet motor applications, while continuously reducing the cost.


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    Titel :

    Permanent magnet technology for electric motors in automotive applications


    Beteiligte:
    Zhang, Sunny (Autor:in) / Xu, Jin (Autor:in) / Junak, Jacek (Autor:in) / Fiederling, Daniel (Autor:in) / Sawczuk, Grzegorz (Autor:in) / Koch, Matthias (Autor:in) / Schalja, Alexander (Autor:in) / Podack, Marcus (Autor:in) / Baumgartner, Joachim (Autor:in)


    Erscheinungsdatum :

    2012


    Format / Umfang :

    11 Seiten, 28 Bilder, 23 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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