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This paper presents a new approach to the sensorless speed control of induction motors (IM). The new technique uses an Adaptive Neural Fuzzy Inference Systems (ANFIS) as a rotor speed estimator to avoid using mechanical sensor. This makes the reference model free of pure integration and less sensitive to stator resistance variations. The ANFIS has been trained offline to estimate the rotor speed in...
Several techniques are available for speed control of induction motor drive. The Direct Torque Control (DTC) method is simple and efficient because of independence of rotor parameters and free from d-q transformation. It is observed that dynamics of DTC drive can be improved by using estimators, observers, and machine intelligence systems. This paper proposes a new technique namely Sector Advancing...
This paper presents a closed loop control technique for harmonic content reduction in the stator current of an induction machine feeded with a three phase inverter, within a velocity control loop. Using a digital filter for Clarke transformation, a robust sliding flux observer, and a closed loop control for the zero sequence of a SVPWM three phase inverter, this work shows how the proposed schema...
To solve the strong randomicity and slow convergence of the Particle Swarm Optimization (PSO) algorithms, two new particlepsilas position renewal formulas were analyzed on the basis of extrapolation in mathematics. A new modified PSO algorithm (called Leading PSO algorithms) was put forward. The direct torque control (DTC) system was built in the environment of Matlab (Simulink). The weight and threshold...
Similar to other sensorless control methods based on signal injection, the resulting signal of the transient voltage excitation is influenced, for example, by the slotting saliency, the anisotropy saliency, as well as by the saturation based saliency and its load and flux dependencies. A separation algorithm to extract the slotting saliency and saturation saliency from the resulting signal is presented...
A control structure is proposed to implement a sensorless speed control driving system with induction machine. The rotor speed is estimated by a model reference adaptive system based algorithm with information from stator variables fundamentals (voltages and currents). Influence of machine parameter sensitivity and low speed estimation errors are discussed. Computer simulated results are presented...
In this paper, the effect of rotor time constant variation on the dynamic performance of rotor flux in the speed sensorless indirect Field Oriented Control (FOC) method of induction motor is considered, then a novel method for adaptation of rotor time constant based on Model Reference Adaptive System (MRAS) is presented. The computer simulations have shown the validity and the feasibility of the proposed...
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