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In industries where the operating condition are stringent and which requires excellent dynamic and steady state performance, the most preferred drive is the three phase induction motor with indirect field oriented control. However, its performance is prone to variation in rotor resistance, which needs to be estimated online. Conventionally, the model reference adaptive system with proportional integral...
Over the past years many kind of control techniques are proposed for induction motor drives. Among them DTC has gained more importance due to fast dynamic response and simple control structures. However it has disadvantage of high ripples in torque and slow response because of hysteresis controllers in torque and flux loop at low speed. To improve the performance of DTC (Direct Torque Control) and...
The speed of three phase Induction Motor (IM) drives are controlled with the help of vector control and scalar control. Direct Torque Control (DTC) is advanced scalar control technique for speed control of IM drives. Fast response, dynamic performance and robustness has made DTC very popular. The Conventional DTC drive requires no coordinate transformation and therefore its control algorithm becomes...
Induction motor with indirect field oriented control is well suited for high performance applications due to its excellent dynamic behavior. But, the indirect field oriented controller is sensitive to variations in rotor time constant, especially variation in rotor resistance. In this paper a scheme based on the Rotor flux Model Reference Adaptive Controller is used for on line identification of the...
Induction motor with indirect field oriented control is well suited for high performance applications due to its excellent dynamic behavior. But, the indirect field oriented controller is sensitive to variations in rotor time constant, especially variation in rotor resistance. In this paper a scheme based on the Rotor flux Model Reference Adaptive Controller is designed for estimating the rotor resistance...
Physical properties of a nanocrystalline thin film is greatly influenced by its morphological and structural evolution. We try to understand the transition of SnO 2 thin films from amorphous to nanocrystalline structure with XRD, IR, SEM, AFM and surface profiler studies. A 2D layer like structure resulting from quantum confinement is found for the films prepared at 400°C. We observed a new...
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