توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱A Novel Method on Adaptive Backstepping Control of Buck Choppers
اطلاعات انتشار: دومین کنفرانس بین المللی الکترونیک قدرت و سیستم های درایو، سال
تعداد صفحات: ۶
In this paper, a novel method for designing Buck chopper controller based on adaptive backstepping is presented. This method is based on accurate modeling of converter considering effect of circuit parasitic elements, better modeling of semiconductor switches and assuming equivalent series resistance of inductor. Also, during controller design process, all the parameters existing in model assumed to be uncertain and an appropriate estimation of these parameters is done by choosing a suitable Lyapunov function. It should be mentioned that in all of the design equations, input voltage of the converter assumed to be time–variant. Simulation results clearly show that designed controller has zero steady–state error and fast dynamic response. More over it can stabilize the converter during wide variation of load resistance and input voltage through inductor saturation.<\div>

۲Direct Torque and Indirect Flux Control of Brushless DC Motor with Non–sinusoidal Back–EMF without position sensor
اطلاعات انتشار: نوزدهمین کنفرانس مهندسی برق ایران، سال
تعداد صفحات: ۵
In this paper, the position sensorless direct torque and indirect flux control (DTIFC) of BLDC motor with nonsinusoidal (non–ideal trapezoidal) Back–EMF has been extensively investigated using three–phase conduction scheme with six–switch inverter. In the literature, several methods have been proposed to eliminate the low–frequency torque pulsations for BLDC motor drives such as Fourier series analysis of current waveforms and either iterative or least–mean–square minimization techniques. Most methods do not consider the stator flux linkage control, therefore possible high–speed operations are not feasible. In this work,by using sliding mode observer the mechanical rotor position is removed. The proposed sensorless DTC method controls the torque directly and stator flux amplitude indirectly using d–axis current. Since stator flux is controllable, flux–weakening operation is possible. Moreover, this method also permits to regulate the varyingsignals. Simple voltage vector selection look–up table is designed to obtain fast torque and flux control. Furthermore, to eliminate the low–frequency torque oscillations, the new method has been used to estimate the electromagnetic torque. Simulation results confirm that the proposed three–phase conduction DTC of BLDC motor drive with six–switch inverter scheme.<\div>

۳Direct Torque Control of a Single Phase Induction Motor Using Backstepping Control
اطلاعات انتشار: بیستمین کنفرانس مهندسی برق ایران، سال
تعداد صفحات: ۶
The Single phase motors are very simple in structure, rugged and widely used in residential and small power operation circmstance. One of the essentialproblems of single phase induction motors (SPIMs) is their high torque pulsation which causes acoustic noise and mechanical damage. Torque pulsation also restrictsthe application of such motors when high precision application is needed. this paper proposes nonlinear Backstepping Control technique ,with the goal of torqueripple optimization. The design of a speed controller is fully given. The proposed controller is realized in thestationary reference frame assuming the rotor flux and stator currents as the state variables. Simulations of the control scheme presented are realized by the Simulink inthe Matlab. Simulation results show the effectiveness of the proposed method.. In addition, the proposed controlsystem achieves cost–effectiveness in both initial and running costs<\div>

۴Direct Torque Control of a Single Phase Induction Motor Using Feedback Linearization Control
اطلاعات انتشار: سومین کنفرانس بین المللی الکترونیک قدرت و سیستم های درایو، سال
تعداد صفحات: ۶
Single phase motors are widely used in indoor and low power industrial equipments. One of the essential problems of single phase induction motors (SPIMs) is theirhigh torque pulsation which causes acoustic noise and mechanical damage. Torque pulsation also restricts the application of such motors when high precision application isneeded. In this paper Input–Output Feedback Linearization Control (IOFLC) technique is used to control the torque(speed) and stator flux of a SPIM separately. Simulation results show the effectiveness of the proposed method<\div>
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