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In this paper, we proposes a direct torque control method of alternating current servomotor, which aims for solving the problems such as large torque ripple of direct control in low speed range and inconsistent inverter switching frequency. In the thesis, SVPWM control strategy and fuzzy neural network adjustor are used for controlling. MATLAB simulation proves that the asynchronous motor using this...
The reasons of torque ripples and flux trajectory resulted by conventional direct torque control of induction motor are discussed. A new control strategy combined predictive control algorithm with synthetic vector duty ratio control technology is proposed based on the discussion to improve the performance of Direct Torque Control (DTC). This method based on the current stator flux linkage and torque...
In this paper two methods of torque control for induction motor have been investigated. First, DTC method is implemented by using complete voltage vectors of the matrix converter. Second, an improved predictive torque control is developed and performed with two-level inverter. In the proposed predictive control the next torque and flux are predicted by discrete model of motor and inverter. Afterward...
Based on the coordinate transformation theory and principle of electromechanical energy conversion, it is demonstrated that the rotor field-oriented control decouples not only flux and torque but also transformer electromotive force (TEMF) and motion electromotive force (MEMF). The field-oriented control of induction motor can be achieved by control of rotor motion electromotive force. A universal...
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