In order to reduce the torque ripple of traditional direct torque control (DTC), a direct torque control scheme for asynchronous motor based on fuzzy space vector modulation is proposed. The scheme combines fuzzy control technology with space modulation (SVM) technology. The two inputs of the fuzzy controller are torque error and error change rate, and the output is the torque control component of the voltage vector. In order to improve the robustness of the control system, a speed-free estimation method based on back-EMF model reference adaptation (MRAS) is used to estimate the rotor speed. Simulation results verify the feasibility and effectiveness of the scheme.
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