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We have proposed a current observer-based speed sensorless vector control system taking into account both iron loss and stator resistance identification. The method is constructed in a synchronously rotating reference frame. The effectiveness of the proposed system has been investigated by digital simulation and experimentation. Furthermore important control parameters such as stator resistance, observer...
The V/f control method is one of speed control methods for induction motors. We have proposed an auto-boost voltage method to compensate the voltage drop of stator impedance and a slip frequency compensation method to decrease the speed error caused by the change of load. Stability of the proposed V/f control system is analyzed by root locus. Steady-state torque-speed characteristics and transient...
This paper presents a new sensorless vector control system for general-purpose induction motors by taking into account iron loss, in which a current-observer-based method and the model reference adaptive system (MRAS) theory are applied. Since the current observer is constructed in a synchronously rotating reference frame with respect to the current model and the parallel exiting circuit of iron loss...
This paper introduces a speed sensorless vector-controlled system for general-purpose induction motor, which is based on the flux observer and the model reference adaptive system method. According to the vector control theory of an induction motor, this system utilizes the q-axis flux converging on zero for speed estimation and speed control. In order to solve the problems of flux estimation by using...
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