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High performance applications of SR motors strictly depend on accurate modeling (or characterization), as well as an appropriate torque control strategy. Most of torque control strategies need torque feedback for realization. Nonlinearity between electrical and mechanical terminals makes simple analytical modeling impossible by means of measured quantities. Therefore, estimation of the motor torque...
The electric vehicles need high efficient torque control system. Therefore, this paper proposes the novel excitation interval control method. The excitation intervals are concentrated around the rotor position where the derivative of inductance becomes maximum values. The efficiency of proposed method is superior to the efficiency of conventional methods.
It is discussed that the starting performance of SR motor is influenced by different mode of running. On the linear condition, the relation between electromagnetic torque and electric current of SR motor is deduced. The fine performance of the SR motor with small starting current and great starting torque is validated from the research on control mode of the SR motor in low velocity and high velocity...
This paper presents the idea of using the Switched Reluctance Motor (SRM) as an alternative to previously used drives, in wide good and other industrial applications. In order to show the advantage of the SRM, the speed control of a switched reluctance motor (SRM) is designed by blending two artificial intelligence techniques, genetic algorithms and fuzzy PI control. Here the Genetic Algorithm (GA)...
Switched reluctance motors (SRMs) have some mechanically structural and electrical advantages. They also have disadvantages not only related to noise but also to nonlinearity in electromechanical responses. Unlike, for example, dc motors, the responses of current and torque of SRMs heavily depend on operating point associated with current and speed. Adaptive control based on model reference adaptive...
Based on the rebuilt of control rule base, a modified type PI-like fuzzy logic controller (FLC) with output scaling factor (SF) self-tuning mechanism is proposed in this paper for application in the switched reluctance motor (SRM) drive system. This paper intends to simplify the construction hierarchy and computational complexity of the controller by trimming the number of fuzzy sets in the membership...
The authors proposed a high power and low vibration novel segment type switched reluctance motor (SRM), but it had a problem of large torque ripple. We also proposed the novel segment type SRM with a 2-steps slide or skew rotor to reduce the torque ripple. We produced the experimental machine and measured the characteristics. The average torque was decreased slightly in comparison with the non slide...
The paper presents a method for estimation of the initial position in a SRM drive which is provided with an incremental encoder. This is necessary immediately after power up, before the motor starts and the index signal is received. On the other hand, to calculate the rotor position when the motor runs the control system should know the displacement of the index signal from the reference position...
In the SRM control, it usually needs to set an angular sub-division for the positional signal of the rotor so as to fix a precise position for the rotor. This paper introduces a new method of realizing angular sub-division by software. It simultaneously analyses the advantages and weakness of Phase-Locked Loop (PLL) multiple frequency circuit to realize angular sub-division. Take Switched Reluctance...
In the paper, the non-sensor control method of the sliding mode observer (SMO) was proposed and used for estimating the rotor position and speed of the Switched Reluctance Motor (SRM). Based on linear inductance model of SRM, the motor position and speed of the SRM was estimated by the phase voltage and current. With the soft of Matlab-Simulink, a simulation model with the SMO for the SRM was built...
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...
This paper presents a new approach to control the turn-off angle θoff used to excite the Switched Reluctance Motor (SRM) used in electric vehicles (EV). The controller selects the turn-off angle which will improve the performance of the electric drive system with turn-on angle constant. This control scheme consisting of classical current controller and speed controller depend on lookup table to choose...
A non-linear mathematical model of switched reluctance motor is established, Based on the analysis of the relationship between ??-I-?? curve of motor, A new type of indirect rotor position estimation method using fuzzy inference rules is designed. The paper adopted MATLAB6.1 as a simulation tool, used for the simulation of fuzzy inference rules of rotor position angle, The simulation result shows...
This paper describes a new position sensorless control method of 3-phase SRM based on the complex plane expression of phase inductance. The rotor position is simply obtained without magnetic characteristics of the motor and additional hardware. In this method, assuming the phase inductance waveform to be sine wave, the rotor position is obtained by computing the angle of the space vector of inductance...
Based on the redevelopment of control rule base, a modified type PI-like fuzzy logic controller with output scaling factor (SF) self-tuning mechanism is proposed and experimentally testified in this paper for application in the switched reluctance motor (SRM) drive system. This paper aims to simplify the structure hierarchy and computational complexity of the controller by reducing the number of fuzzy...
This paper describes a novel speed control system with flat torque control for switched reluctance motor (SRM) drives. The flat torque controller as current regulator not only realizes the motor current waveforms for constant torque generation of SRMs, but also compensates non-linear torque-current characteristic of SRMs. In this paper, some experimental results are presented to demonstrate the validity...
In this paper, an advanced torque control scheme of SRM (switched reluctance motor) using modified non-linear logical TSF (torque sharing function) based on the DITC (direct instantaneous torque control) with PWM (pulse width modulation) is presented. The proposed torque controller uses the non-linear logical TSF and switching rules which realized by DITC, however the switching period is calculated...
In order to solve problems of taking traditional mechanical bearing to bear the shaft, a novel bearingless switched reluctance motor with hybrid stator poles is proposed in this paper. The rotor needs only one bearing for rotating and constraining the axial movement. The other end can move freely in the radial direction. But it is balanced with the radial force produced by the motor. The proposed...
This paper presents the modeling, simulation, and control of Switched Reluctance Motor (SRM) for high-speed applications. The model of SRM is built with help of three-dimensional relationship between excitation currents, rotor position and flux linkage. The relationship makes electromagnetic torque depends not only on the excitation currents but also on the rotor position. Therefore, it is difficult...
Nowadays, besides the rapid growth of different areas like the mechanical and electrical ones, it is possible to identify a particular effort to develop new motors including new electrical drives and control systems. Additionally, these equipments are being designed to give them the maximum efficiency as the energy cost is continuously increasing. With this in mind, some results related to a particular...
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