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Vector control based on rotor field orientation control (FOC) and direct torque control based on stator field observation (DTC) are nowadays two mainstream control strategies in modern asynchronous motor speed regulating system. Based on the smooth switching control that is combined with the two control methods in the light of the complementarity each other, the online adaptive parameters estimation...
A control system for permanent magnet synchronous motor electric drives with a significant torsion vibration mode is presented based entirely on sliding mode principles to achieve robustness against external load torques and parametric modelling uncertainties in the motor and/or the driven mechanical load. The sliding mode control law respects the vector control condition by keeping the direct axis...
This paper presents an improved stator flux orientated (SFO) control strategy of induction motors. Based on coordinate transformation and stator flux orientation, a mathematical model of induction motor is derived. In this new system, the stator flux linkage is directly controlled by the d-axis component of stator voltage and in the speed control channel, the output of current controller is regarded...
A vector control system of an induction motor is proposed to suppress influence of iron loss. It is pointed out that the rotor flux estimator contributes more to torque control linearity than the current controller. Therefore, it is proposed that a rotor flux observer which can suppress the influence of some parameter deviations, (especially that of rotor resistance), can be applied to decrease the...
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