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Direct Torque Controlled Induction Motor Drives with Constant Switching Frequency Strategy
(Beykent Üniversitesi, 2008) Okumus, H. İbrahim; Holliday, D.
Although direct torque control (DTC) has some attractive features such as lesser parameter dependence, fast dynamic response, and no requirement for mechanical rotor position sensor for the inner torque control loop there exist some problems such as the relatively large torque ripple in a low speed range and switching frequency variations according hysteresis band amplitudes and the motor operating speed. To solve these problems a constant switching frequency torque controller is proposed to replace the conventional hysteresisbased controller. The strategy proposed modulates the torque error with a high frequency carrier signal resulting in a constant torque switching frequency that improves the performance of the DTC by combining a low torque-ripple characteristic in steady state with the fast torque dynamics. Experimental results prove the applicability of the proposed strategy clearly as compared with the conventional method.