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This paper presents advanced torque and current control techniques for Permanent Magnet Synchronous Motors (PMSMs) with a real-time simulator which has a nonlinear motor model. This model is called a “behavior motor model” and is developed based on finite element analysis results to take into account nonlinear characteristics including spatial harmonics and magnetic saturation. The real-time simulator...
In the present work a novel strategy for optimum design of flux and torque controller for carrier space vector pulse width modulation based direct torque control (CSVPWM DTC) of induction motor (IM) drive has been implemented. Two positive and one negative torque slope levels per half the switching period has been predicted for CSVPWM DTC IM drive based on which a new optimal control strategy is proposed...
This paper presents a novel Adaptive Neural Fuzzy Inference System (ANFIS) based Matrix Converter for speed control of Induction Motor. The proposed ANFIS consists of fuzzy logic controller algorithm with a five layer Artificial Neural Network. The ANFIS system tunes the fuzzy system with hybrid learning algorithm and hence generates the reference voltage. The reference voltage is used to generate...
In this paper, a flexible DTC based on variable structure approach and space vector modulation is presented for encoderless Synchronous Reluctance Motor (SynRM) Drives. According to this method, a sliding mode-plus-PI controller is designed for torque and flux control in stator flux reference frame, respectively. The proposed controller is able to reduce the torque, flux, current and speed pulsations...
In the last decades, fault diagnosis of voltage source inverters has received a lot attention since their application to variable speed drives has become an industrial standard. Recently, some methods have been suggested for open-circuit faults in the switching devices of voltage source inverters. However, most of these methods might not work properly for different working conditions of the motor...
This paper presents an original variable gain PI (VGPI) controller for speed control of a simplified direct torque neuro fuzzy controlled (DTNFC) induction motor drive. First, a simplified direct torque neuro fuzzy control (DTNFC) for a voltage source PWM inverter fed induction motor drive is presented. This control scheme uses the stator flux amplitude and the electromagnetic torque errors through...
This paper presents a study of axial flux permanent magnet synchronous motor (AFPMSM) drive system. An internal model control (IMC) strategy is introduced to control the AFPMSM drive through currents, leading to an extension of PI control with integrators added in the off-diagonal elements to remove the cross-coupling effects between the applied voltages and stator currents in a feed-forward manner...
Since there's a biggish output ripple in current direct torque's control, we design a direct torque control system for three-level inverters used in asynchronous motors by analyzing the operational principle of the diode clamped three-level inverters, and simulation is done as well. Ripples of the torque and the rotational speed of the motor can be deduced effectively, and a stable output and a good...
The most important part of the direct toque control for five-phase PMSM is to select the appropriate voltage vectors. This paper develops two methods for this. First the PI control method is used to decide the reference voltage vector and second the way for selecting proper voltage vectors to synthesize the reference voltage vector in order to minimize the effection of harmonics current is gived....
This paper describes the design of a new simple antiwindup control based on a PI control with an initial value of the integral state variable as a design parameter. It is combined a P controller and a PI controller. Before the changeover point, it uses a P controller. It is changed from the P controller to the PI controller after the changeover point. The changeover point is simply defined by using...
In this paper, a novel torque ripple minimization method, namely, sliding mode variable structure is proposed for switched reluctance motor (SRM). The total reference torque is calculated by the speed error via the sliding mode variable structure controller, and the expected phase torque will be got through the Torque Sharing Function. Then make margin calculations between the expected phase torque...
Among all control methods for induction motor drives, Direct Torque Control (DTC) seems to be particularly interesting being independent of machine rotor parameters and requiring no speed or position sensors. The DTC scheme is characterized by the absence of PI regulators, coordinate transformations, current regulators and PWM signals generators. In spite of its simplicity, DTC allows a good torque...
Direct torque control (DTC) is considered as the best alternative for permanent magnet synchronous (PMSM) drives. Classic switching-table based DTC has high torque and flux ripple due to the implementation of hysteresis control. Switching frequency can be made constant by replacing hysteresis control with space vector PWM (SVM) and requires mathematical modification on SVM input. Propotional+integral...
In this paper, a new controller design method is developed for the control of separately excited dc motors, fed by a three phase PWM ac-dc converter. A complete model is developed using the d-q reference frame for the ac part and the conventional dc formulation for the motor. Based on passivity analysis, by using as storage function the total energy of the system, it is proven that the system is always...
This paper presents a fuzzy logic controller (FLC) based on variable structure control (VSC) with sliding mode concept is used to control the speed of switched reluctance motor (SRM) drives. Since, the VSC has several attractive advantages such as high speed response, good transient performance, insensitivity to variation system parameters and external disturbances, simplicity of realization and robustness...
The paper introduces the components of the double switched reluctance motors drive system. There are two controllers, such as the main controller and the subroutine motor. The main controller is for the closed-loop rotor speed control of the main motor, in which sliding mode control algorithm is adopted. The subroutine controller is for the closed-loop rotor speed control of the subroutine motor,...
A strategy of fuzzy-PI control of switched reluctance motor drive system is presented. The strategy of fuzzy and PI is combined to realize the speed adjustment. The outer loop input is speed error and speed error derivative, while the outer loop output is torque which enters the inner loop of the direct torque control system to control 60 KW three phase 6/4 pole SRM. For the outer loop, it adopts...
A four-phase 8/6 pole and 75 kW switched reluctance motor drive based on 32-bit digital signal processor TMS320F2812 is designed. The details of the controller design and analysis are discussed. In addition, aiming at solving the nonlinear problems of the switched reluctance motor, fuzzy-PI hybrid algorithm is presented to control the motor speed and the phase current. Experimental results show that...
This paper presents an improved direct torque control (DTC) method for sensorless matrix converter drives using a multi-mode indirect space vector modulation (ISVM) and an adaptive sliding mode observer. The drive system is characterized by reduced torque and flux ripples, unity input power factor, sinusoidal input/output waveforms and good sensorless control performance over a wide speed range, while...
This paper presents the development and performance testing of a 2 loop resolution-level controlled (RLC) WM inverter-fed three-phase (3phi) squirrel-cage induction motor (IM) drive system. The proposed RLC WM inverter-fed IM drive is based on controlling the WM inverter output voltages using both a phase-shift thetas and the maximum value of the scale J. These two parameters are employed to adjust...
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