In traditional direct torque control (DTC), it often has the shortcoming of large flux linkage ripple, large torque ripple, and poor performance in low-speed range. A modified DTC suitable for the full-speed range of electric motor asynchronous motor is proposed from three aspects, which are motor speed range, stator flux linkage observation, and control mode. The super-twisting (ST) sliding mode algorithm is introduced into the traditional DTC. In the low-speed range of motors, it adopts the circular flux control strategy and stator flux linkage observation based on current model. In the middle or high speed range of motors, the regular hexagonal flux linkage control strategy is adopted, which reduces the switching loss of the inverter, and stator flux linkage observation using voltage model. The simulation results show that the ST sliding mode algorithm not only eliminates the chattering problem of the first-order sliding mode, but also significantly reducing the stator flux linkage and torque ripple, overcome the influence of stator resistance change on stator flux linkage observation at low speed of motor and improved motor low-speed control performance. The system has stronger dynamic and static performance, and has stronger robustness performance against system parameter changes.


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    Title :

    Research on Sliding Mode Direct Torque Control of Asynchronous Motor for Electric Vehicles


    Additional title:

    Sae Int. J. Elec. Veh


    Contributors:


    Publication date :

    2022-09-29


    Size :

    17 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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