the mean of the produced torque to be equal to the command torque. Fig. 3(c) shows the average switching frequency of both schemes; the conventional DTC scheme shows considerable variation in frequency which has been effectively controlled in the duty-cycle control scheme. Fig. 3(d) shows the duty cycle calculated by the torque-ripple reduction scheme.
VI. CONCLUSIONA simple scheme has been presented for duty-cycle control in a DTC-based induction motor drive. The scheme has been shown to reduce the torque ripple produced by this kind of drive, particularly at low speeds. The scheme has also been shown to effectively control the mean of the output torque and to limit the switching frequency variation.
REFERENCES
Passivity-Based Control of Saturated Induction MotorsLevent U. Gökdere, Marwan A. Simaan, and Charles W. BriceAbstract-A passivity-based controller, which takes into account saturation of the magnetic material in the main flux path of the induction motor, is developed to provide close tracking of time-varying speed and flux trajectories in the high magnetic saturation regions. The proposed passivity-based controller is experimentally verified. Also, a comparison between the controllers based on the saturated and nonsaturated magnetics is presented to demonstrate the benefit of the controller based on the saturated magnetics.
We consider a linear quadratic optimal regulation problem of a servo motor in the presence of stochastic load disturbance subject to a constraint that establishes a desired motor winding lifetime. To satisfy the constraint, a family of LQR control designs is parameterized with a single scalar performance weight that establishes a trade-off between performance and control power. Power analysis approach is then used to find the optimal value of the parameter that provides maximum disturbance rejection control in the given LQR family subject to the desired motor lifetime constraint.
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