Long-distance heavy-duty electric vehicles, e.g., electric trucks, expect demanding requirements from the electric drive system, including high starting torque, high torque density, high power factor, high efficiency, and so on. Permanent magnet synchronous machines (PMSMs) have been widely used for traction applications. However, the high cost and associated environmental issues due to the rare-earth permanent magnet material intensify researchers to explore new solutions. Accordingly, a brushless electrically excited synchronous machine (EESM) is designed and investigated in this article. The brushless EESM is also quantitatively compared with a PMSM candidate for the aforementioned application. Differing from conventional EESMs in which the brushes and slip rings are used for rotor field winding excitation, a contactless/brushless rotating transformer is adopted for the presented EESM to feed the rotor field winding. It is shown that the interior PMSM exhibits higher efficiency in low-speed region but lower efficiency in high-speed region. By contrast, the brushless EESM exhibits lower efficiency in low-speed region but much higher efficiency in high-speed region. Hence, the EESM is more suitable for long-distance heavy-duty electric vehicle applications, where significant high-speed operations are required. Moreover, compared to the PMSM, the EESM is more cost-effective, sustainable, and environmentally friendly due to the absence of the rare-earth permanent magnet material. Both the PMSM and the EESM are prototyped and manufactured. Experimental results are provided to validate the effectiveness of the presented designs.


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    Title :

    Electromagnetic Performance Investigation of a Brushless Electrically Excited Synchronous Machine for Long-Distance Heavy-Duty Electric Vehicles


    Contributors:
    Chen, Hao (author) / Tang, Junfei (author) / Liu, Yujing (author) / Jiang, Bowen (author) / Boscaglia, Luca (author)


    Publication date :

    2025-02-01


    Size :

    4436837 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    ELECTRICALLY EXCITED SYNCHRONOUS MACHINE

    GRELLE THORSTEN / OSDOBA FLORIAN / TOPALOV PENYO et al. | European Patent Office | 2025

    Free access


    Long distance and heavy duty electric railways

    Darlington, F.W. | Engineering Index Backfile | 1896


    Long distance and heavy duty electric railways

    Darlington, F.W. | Engineering Index Backfile | 1896