Purpose. Improvement of the direct torque control algorithm and thereby increase in the efficiency of the electric drive on the basis of the squirrel cage induction motor. Methodology. The use of the theory of sliding-mode control and hysteresis regulators allows considering the traditional direct torque control algorithm as a special case, which is obtained for certain values of the weight coefficients of deviation from the given regimes. Changing these coefficients leads to a change in the sector boundaries of the switching table. The analysis of system behavior on the basis of the established quality criterion gives the possibility to determine the necessary changes of sector boundaries for improving the characteristics of the drive and to synthesize a fuzzy controller that implements the sliding mode control with variable weight coefficients. The efficacy of the proposed control algorithm was investigated by use the modified MatLab model of the direct torque control and the necessary computer experiments were performed. Findings. On the basis of the established criterion, the influences of the change in the switching table sector boundaries on the characteristics of the electric drive with direct torque control were analyzed. The fuzzy controller was synthesized based on the theory of sliding mode control. The behavior of the direct torque control system with fuzzy controller was investigated. Originality. The scientific novelty of the proposed approach is in further development of the theory of fuzzy controllers synthesis based on the methods of classical control theory and improving the direct torque control algorithm at low speeds, as well as in the high speeds with load close to the nominal. Practical value. The proposed structure of the fuzzy controller can be easily implemented in existing systems of direct torque control and will provide an improvement of the technical and economic performance of the electric drive.

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