The wide variation of induction motor characteristics with temperature, coupled with unpredictable track and load conditions, make the inclusion of closed loop tractive effort control essential where there exists a requirement for repeatability and predictability of performance. Such a requirement is often necessary on rapid transit systems and multiple unit operations. In particular the variation of rotor resistance (typically 50 % over normal operating conditions) will result in tractive effort variations. Open loop control methods require measurement of individual wheel diameters, so that the inverter frequencies may be compensated to maintain equal output torques. The alternative would be to keep wheel diameters matched. Open loop schemes also suffer the risk of torque pull out.


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    Title :

    Torque control of A.C. induction motor traction drives


    Additional title:

    Die Drehmoment-Regelung von Asynchronmotoren in Elektrolokomotiven


    Contributors:


    Publication date :

    1987


    Size :

    5 Seiten, 6 Bilder, 8 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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