An electric bus system has been operating in the downtown area of Chattanooga, TN. The buses use traditional hard-switched IGBT inverters driving special induction motors with a speed sensor (tachometer) and two embedded flux-sensing windings to provide rotor speed and flux information to the motor controller for implementation of high performance field oriented control (vector control). The induction motor is oil-cooled and equipped with an internal planar gear reduction. The system has experienced failures in both speed sensors and flux sensors due to their unreliable and weak EMI-immunity feature and hostile (oil-leakage) environment. A speed- and flux- sensorless induction motor drive system with a new 100 kW soft-switching inverter has been implemented to replace the existing system, targeted at the use of commercially-off-the-shelf induction motors instead of the customer-designed special motors. The project was supported under the US Department of Energy funding and local industry partnership.


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    Title :

    Speed and flux sensorless field oriented control of induction motors for electric vehicles


    Contributors:
    Peng, F.Z. (author)


    Publication date :

    2000


    Size :

    7 Seiten, 8 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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