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The paper is concerned with the study of the speed control loop of an ultrahigh speed machine applied in the utilisation of renewables and in recovering waste energy. The rated speed of the machine is 90 000 rpm. The main target is to prevent the overspeed of the machine set by studying with simulation the response of the nonlinear speed control loop by taking into consideration both the mechanical...
The purpose of this paper is to present a new methodology to control current-fed induction motor. This approach results from a combination on the differential flatness properties and the monovariable generalized predictive control with multiple reference model(GPC/MRM) algorithm. Simulation results are given in the case of nominal and mismatched parameters on the complete nonlinear model.
Due to the multi-variable, strong coupling, nonlinear and time-varying characteristics of induction motor, it is not easy for direct torque control (DTC) system with traditional PID controller to get ideal performance. In order to improve the performance of Direct Torque Control system, a fuzzy PID regulator of motor speed is proposed to adjust the nonlinear control variable. According to the principle...
In this paper, a variable structure controller based on sliding-mode design is proposed for induction motors that propel electric vehicle drives. The underlying design concept is to endow the closed loop system with high performance dynamics for all possible speed ranges while maximizing power efficiency and keeping the required stator currents within the inverter ceiling limits. The proposed approach...
In the paper it is presented speed sensorless nonlinear control system using multiscalar model based MMB operating in the lower field weakening speed region. Nonlinear control methods can improve the performance of induction motor drives in transients. The maximum available output torque, which guarantees satisfactory motor dynamics in field weakening region, is calculated using the steady state dependencies...
The paper analyses the inductance saturation effects of an induction motor in order to be considered in the nonlinear control drive technique. The involved inductances are determined through finite element modeling of the induction machine. The impact of coupled field and circuit approach on the derived parameter variation has also been examined. The methodology is suitable for control techniques...
This paper presents the real-time performance evaluation of a nonlinear controller for speed control of an induction motor (IM) drive. Neglecting the iron loss in an induction motor model causes performance deterioration. In this work, an adaptive backstepping based nonlinear controller incorporating the iron loss is developed under the parameter uncertainties. The adaptive backstepping technique...
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