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Control strategies applied for reducing the vibration and torque ripple of a special Switched Reluctance Motor
Correa, D. A. P.;Silva, W. M. da;Nabeta, S. I.;Chabu, I. E.;
Journal of Microwaves, Optoelectronics and Electromagnetic Applications , 2011, DOI: 10.1590/S2179-10742011000100019
Abstract: despite its robustness the switched reluctance motors (srms) present some inconvenient drawbacks as a major torque ripple, vibration and acoustic noise when compared to other types of motors. these characteristics are usually related to factors such as the salient poles in the stator and in the rotor, the switched feeding and the control strategy imposed by the electronic converter. in this paper a special switched reluctance motor for fractional horsepower and high speed hand tool was studied in order to minimize its vibration and torque ripple characteristics. this task was accomplished by the development of a simple and flexible motor drive and the combination of two different commutations strategies: the three level control and the single pulse with overlapping phase current. the srm prototype and its drive were constructed and submitted to several tests with the proposed commutation strategies. in the frequency domain the strategies results were considered satisfactory.
A New Front End Capacitive Converter Fed Switched Reluctance Motor for Torque Ripple Minimization  [PDF]
S. Muthulakshmi, R. Dhanasekaran
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.75050
Abstract: This paper presents new converter for torque ripple minimization of three phases Switched Reluctance Motor (SRM). The proposed converter has basic passive circuit which includes two diodes and one capacitor to the front end of an asymmetric converter with a specific end goal to get a high magnetization and demagnetization voltage. In view of this boost capacitor, the charge and demagnetization voltage are higher. Accordingly, it can reduce the negative torque generation from the tail current and enhance the output power. The proposed converter circuit is equipped for minimizing the SRM torque ripple furthermore enhancing the average torque when contrasted with traditional converter circuit. A three-phase SRM is modeled and the simulation output for no load and stacked condition depicts that the proposed converter has better performance when contrasted with traditional converter. It is appropriate for electric vehicle applications. The proposed framework is simulated by utilizing MATLAB/Simulink environment and their outcomes are examined extravagantly.
Torque Ripple Minimization in a Switched Reluctance Drive by Neuro-Fuzzy Compensation  [PDF]
L. Henriques,L. Rolim,W. Suemitsu,P. J. Costa Branco,J. A. Dente
Computer Science , 2000, DOI: 10.1109/20.908911
Abstract: Simple power electronic drive circuit and fault tolerance of converter are specific advantages of SRM drives, but excessive torque ripple has limited its use to special applications. It is well known that controlling the current shape adequately can minimize the torque ripple. This paper presents a new method for shaping the motor currents to minimize the torque ripple, using a neuro-fuzzy compensator. In the proposed method, a compensating signal is added to the output of a PI controller, in a current-regulated speed control loop. Numerical results are presented in this paper, with an analysis of the effects of changing the form of the membership function of the neuro-fuzzy compensator.
Speed Control Strategy of Switched Reluctance Motor

杜舟, 吴定祥, 唐立军
Journal of Electrical Engineering (JEE) , 2016, DOI: 10.12677/JEE.2016.41008
针对开关磁阻电机的调速控制系统的起动方式和速度控制开展研究,采用两相绕组通电起动的方式,以增大转矩、减小转矩脉动。提出了模糊–自适应整定PID控制算法,并以STM32 + FPGA为主控制器,应用低速电流斩波、高速角度位置控制方式设计了开关磁阻电机调速系统。对于解决超调量高、动态响应慢的不足、精确度不高的问题有一定的效果。实验结果表明,系统转速的精确度在10 r/min之内,最大超调量为15 r/min。
Aimed at research on starting mode and speed control of switched reluctance motor speed control system, a two-phase starting is adopted to start the electric, in order to increase the torque and reduce the torque ripple. A fuzzy adaptive PID control algorithm is proposed, and a switched reluctance motor speed control system with STM32 + FPGA as the main controller is designed, applying current chopping in low speed and angle position control mode in high speed, which has a certain effect on solving the problems of high overshoot, slow dynamic response and low accuracy. The experimental results show that the precision of the system speed is within 10 r/min, and the maximum overshoot is 15 r/min.
Design, Modeling & Simulation of Fullpitched Winding Segmented Switched Reluctance Motor
International Journal of Engineering Science and Technology , 2011,
Abstract: Switched reluctance motors (SRM) have advantages of low manufacturing cost, rugged and simple construction and lesser switches in drive circuit. However, some of its disadvantages are noise, torque ripple and low torque per unit volume. A few of these limitations, such as noise and low torque to volume have been mitigated in the segmented switched reluctance machine (SSRM), which uses a full-pitched winding. In this paper, a novel segmented switched reluctance machine is proposed. The design procedure for segmented switched reluctancemotor is defined and various equations are shown. Finally Matlab/Simulink based model is developed and simulation results are presented.
Study on Switched Reluctance Motor Control System Based on DSP  [cached]
Liu Gang,Xu Haigang,Duan Binglong
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: Accord to the theory of micro-step control, this study is about a design of a four-phase switched reluctance motor based on DSP-driven control system. Firstly, the study is about the design of the hardware circuit, such as the power inverter and its drive, current detection, position detection and the system power supply. And then to build a switched reluctance motor control system, TMS320L2812 as the core of control. Experiments show that this control strategy control is simple, but able to effectively restrain the torque ripple of switched reluctance motor under low speed.
Application of Fuzzy Logic in Control of Switched Reluctance Motor
Pavel Brandstetter,Roman Hrbac,Martin Polak,Libor Stepanec
Advances in Electrical and Electronic Engineering , 2006,
Abstract: The flux linkage of switched reluctance motor (SRM) depends on the stator current and position between the rotor and stator poles. The fact determines that during control of SRM current with the help of classical PI controllers in a wide regulation range unsatisfied results occur. The main reasons of the mentioned situation are big changes of the stator inductance depending on the stator current and rotor position. In a switched reluctance motor the stator phase inductance is a non-linear function of the stator phase current and rotor position. Fuzzy controller and fuzzy logic are generally non-linear systems; hence they can provide better performance in this case. Fuzzy controller is mostly presented as a direct fuzzy controller or as a system, which realizes continued changing parameters of other controller, so-called fuzzy supervisor. Referring to the usage of fuzzy logic as a supervisor of conventional PI controller in control of SRM possible improvement occurs.
Direct Instantaneous Torque Control of Switched Reluctance Motors  [PDF]
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering , 2013,
Abstract: The main disadvantage of switched reluctance motors (SRM) is the higher torque ripple compared to conventional machines, which result in acoustic noise and vibration. The torque pulsations in an SRM are due to the highly non-linear and discrete nature of torque production mechanism. The paper presents an investigation on the direct instantaneous torque control (DITC) of a 1-hp four-phase 8/6 switched reluctance motor (SRM). In the proposed technique, direct instantaneous torque control for a four-phase SRM drive the torque sharing function can be used to generate the reference values of phase torques from the required torque. The switching signals are directly generated from the comparison between the reference phase torques and the estimated phase torques using hysteresis controller. The hysteresis torque controller generates gating signals to the power converter. The instantaneous phase torques can be calculated from the phase currents and rotor position. Therefore, a high-resolution encoder can be avoided. Results obtained from computer simulations of the developed MATLAB / Simulink model experiments have confirmed the validity and acceptable performance of the proposed scheme.
Torque Optimization of Medium??Low Speed Switched Reluctance Motors

- , 2016, DOI: 10.7652/xjtuxb201611013
Abstract: 为解决开关磁阻电机因其双凸极结构和严重非线性电感特性所导致的在换相和单相导通时转矩脉动较大的问题,提出了以转速、转矩和电流为控制量的模糊滑模多重闭环控制策略。速度环采用模糊滑模控制,通过积分变换将转速差转化为给定转矩,通过比较电机瞬时转矩与给定转矩,控制开关管的导通关断,实现转矩闭环控制;在电机换相时对同时导通的两相绕组进行转矩分配,建立转矩、电流和转子位置角的解析式,由分配的转矩求得给定的绕组电流进行电流闭环控制,从而达到对电机换相和单相导通时转矩脉动的有效抑制。仿真试验结果表明:在电机中、低速运行时,该控制系统与PID控制下的直接瞬时转矩控制(DITC)系统相比控制效果更好;电机低速运行时转矩波动稳定在±0.3 N?m以内,中速运行时转矩波动稍有增大,但仍维持在±0.8 N?m以内,实现了对转矩脉动的有效抑制。
Switched reluctance motor with double salient structure and nonlinear inductance characteristics may be subject to torque ripple when working in the states of switching and single??phase conducting. In view of this, a fuzzy sliding??mode multiplex??loop control system with control quantities of speed, torque and current is designed, in which fuzzy sliding??mode control is adopted for speed loop and the speed difference is transformed into given torque through integral transformation. By comparing instantaneous torque with the given torque, switching tubes will be controlled to realize torque’s closed??loop control. The torque is distributed to the windings of two simultaneously conducted phases during the commutation of motor and the equations of torque, current and rotor position angle are established. The winding currents will be obtained via the distributed torque to realize current’s closed??loop control. Therefore, the torque ripple can be depressed effectively during the commutation and single??phase conducting. Simulation and experimental results show that the proposed method has a better control effect than the direct instantaneous torque control (DITC) with PID at low speeds, and the torque ripple can be stabilized within ±0.3 N?m, while becoming slight greater at medium speeds but within the range of ±0.8 N?m. So the torque ripple is depressed effectively by the proposed method
Impact Analysis of Dwell Angles on Current Shape and Torque in Switched Reluctance Motors  [cached]
Syeda Fatima Ghousia
International Journal of Power Electronics and Drive Systems , 2012, DOI: 10.11591/ijpeds.v2i2.236
Abstract: The reduction of torque ripple is the main target in research for designing a variable drive system with switched reluctance motors (SRM) for higher torque density and better efficiency. This ripple is due to the transition of excitation current between the adjacent phases. Precise control of turn-on and turn off angle is required to smooth the torque. In this paper, the effects of selecting the turn-on and turn-off angles are simulated in detail. It is observed that with the extended turn-on and turn off angles, the precise selection of turn-on and turn off angle can alter the shape of the excitation current in the stator coil and its point of overlapping with the adjacent coil. Therefore the transition between different phases can be smoothed out. The impact of this alteration on the excitation current and torque ripple as a function of different parameters of dwell angle is studied in detail in this paper. It is found that a sinusoidal current shape can also be obtained with the proper selection of these parameters.
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