Mitigation of torque ripple in a switched reluctance motor using an interval type II fuzzy controller

<div class="htmlview paragraph">Switched Reluctance Motor (SRM) mainly has two advantageous characteristics such as no magnet and simple construction. These characteristics contribute lower cost and higher reliability compared with other motor systems such as brushless permanent magnet motors or induction motors. However, SRM has disadvantages that are its torque ripple and acoustic noise in particularly. Moreover, the resonance frequency mode of a motor system is excited by torque ripple, and drive train vibration is caused. These noise and vibration should be suppressed when the SRM is applied to a traction system for passenger electric vehicle since these characteristics affect vehicle quietness and drivability.</div> <div class="htmlview paragraph">In this paper, we describe an approach to suppress drive train vibration and acoustic noise. Regarding drive train vibration, we have made a motor controller by using two-degree-of-freedom (2DOF) H∞ control which satisfy quick response for torque command, very low vibration, and a robustness for variation of control characteristics caused by aging or mass production. And we also have reduced acoustic noise by using new current control algorithm to reduce radial force between a motor stator.</div>

Basically switched reluctance motor (SRM) is associated with torque ripple and acoustic noise. So, with control of torque ripple, SRM performance can be enhanced. The torque control is achieved with speed control. This paper designed the speed controller and fed to switched reluctance motor (SRM) with two converter topologies i.e. C-Dump converter and R-dump converter to minimize the torque ripples using MATLAB Simulink. The 6/4 SRM motor speed is compared with reference speed and speed error signal is processed through speed controller to produce the current command signal. This current command signal is given to SRM phase, there it again compare with phase current and generate the current error signal. The switching signal for SRM is generated with this current error signal. Simulation results shown for two converter topologies. Simulation results shows, performance of speed controller is similar to conventional PI controller with minimum torque ripple.

Torque ripple and acoustic noise are two major drawbacks to switched reluctance motors. The abrupt change of phase current is main cause of acoustic noise, while both commutation and current wave shape are two major factors contributing to high torque ripple. In order to simultaneously reduce torque ripple and noise, a specific current modulation based on real inductance profile can be employed to recently proposed pseudo-sinusoidal switched reluctance motor (PSSRM). Performance comparison including torque ripple, acoustic noise and efficiency with conventional square and half-sine current modulations are investigated. The performance of the specific current modulation is verified by simulations and experiments with a 12/16, three phase 0.4-hp PSSRM. The results show torque ripple and acoustic noise can be simultaneously reduced with a comparable efficiency by the proposed current modulation method.

In this paper, an ANFIS-primarily based torque controller is used to manage a sun solitary photovoltaic powered feed Switched Reluctance Motor (SRM). High torque ripple, mechanical vibration, and acoustic noise are the main downsides of the SRM. Its nonlinearity and double salient structure cause it to supply torque ripple. There is no developed way for reducing torque ripples in switching reluctance motors. The Maximum Power Point Track method (MPPT) Perturb and Observe (P&O) algorithm is applied to the PhotoVoltaic (PV) system in order to extract the highest level of power from the panel. This research project has completed the modeling and analysis of a switching reluctance motor. ANFIS is significantly more accurate, less difficult, stable, and generalizable than other techniques, as seen by comparisons with other techniques.

Switched reluctance motors (SRMs) are an attractive choice for electric vehicle (EV) applications but suffer from certain limitations, such as high torque ripple and acoustic noise. This paper presents ongoing research and development activity details to enhance the performance of SRMs for EV applications. The poor performance of a conventional SRM which is available in market with a rating of 8/6 poles, 48 V, 500 W, and 2,000 rpm is tested. A motor model of the same rating is developed using ANSYS Maxwell software. Motor performance parameters important for EV applications, such as efficiency, rated torque and torque ripple are compared with the conventional motor. One novel technique to reduce the torque ripple of SRM is discussed along with the results. Torque ripple of developed software model is reduced by 24.52% without a reduction in the efficiency and rated torque of the motor. The performance of the developed SRM software model is better compared to conventional SRMs available in the market. 2D and 3D models of SRM were presented using ANSYS Maxwell software.

This paper presents a new switched reluctance motor (SRM) drive circuit for torque ripple reduction. The main drawbacks of SRMs are large torque ripple and acoustic noise. The torque ripple can be reduced by the stator current waveform shaping. This paper gives ideal stator current waveforms for the flat instantaneous torque. The new SRM drive circuit is proposed to synthesize the actual stator current as close as possible to the ideal ones in waveforms. The computer simulation demonstrates that the new circuit brings much small torque ripple compared with that by the conventional SRM drive circuit.

Switched Reluctance Motor (SRM) will have a reasonable space in future electric motor market due to its simple and robust construction. The doubly-salient pole structure of the SRM leads to some major disadvantages like torque ripple, vibration and acoustic noise. Torque ripple is one of the main issues which can be minimized either by modifying the geometrical design of the motor or by adopting various control strategies. Varying the geometrical design of the motor increases complexity of the machine. But the advent of modern power electronic devices helps in improving the complexity of the drive. Further research and development in SRM drive is essential. This paper provides a short overview of different control strategies adopted to minimize torque ripples in Switched Reluctance Motor Drives.

Switched reluctance motor (SRM) as the name indicates is a machine in which torque is produced by the tendency of its moveable part to move to a position where the inductance of the excited winding is maximized (T.J.E. Miller, 2002). Thus far, SRMs are not established successfully in industry compared to brushless DC motors and induction motors. As per construction of the SRM, there shall not be any reasons as it is simple, ruggedness and winding-less rotor makes it easy for cooling process. However, the primary disadvantages of SRM being torque ripple and acoustic noise. Torque ripple stops SRM to secure place in industry. This problem has to be tackled by introducing appropriate control methods. Many efforts have been put on by researcher around the globe and it seems the problem remain unsolved. In this paper, we are to look at the development on control methodologies introduced and applied, and their success story and the future trends as far as the SRM drives is concern.

Switched reluctance motor (SRM) drives offer the advantages of simple and robust motor construction, high speeds, high overall efficiencies over a wide operating range of torque and speed, simple power converter circuits with a reduced number of switches and excellent controllability. However, the switched reluctance motor has a drawback in that it generates acoustic noise. This study aims to minimize the acoustic noise of a 8/6 switched reluctance motor with sum of the square of the phase currents and variable structure system (VSS) with sliding mode control (SMC) methods in the linear region and in presence of mutual inductances. In this study, the torque ripple of switched reluctance motor has been greatly removed and the acoustic noise has also been reduced. Sliding mode control techniques have been applied to switched reluctance motors in this study and successful results has been obtained. The results show that the sliding mode control is effective in reducing the torque ripple of the motor, compensating for the nonlinear torque characteristics, and making the drive insensitive to parameter variations and disturbances. A mathematical model of a 8/6 switched reluctance motor, the design of the sliding mode controller and simulation results are given in this paper.

Switched reluctance motors (SRMs) are promising for propulsion motors of electric vehicles (EVs) because of their robust mechanical construction and cost effectiveness. However, practical application of SRMs to vehicular propulsion is hindered by comparatively large torque ripple and radial force ripple, which cause noise vibration and acoustic noise. Previous studies have proposed phase current profiles which suppress both ripples. However, in the derivation process of phase current, these previous studies need numerical calculation hindering the EV development speed. The purpose of this paper is to propose a novel phase current profile to suppress both the torque ripple and the radial force ripple of SRMs without numerical calculation. The profile can be straightforwardly calculated using a simple analytical model of the SRMs. In addition, the profile can be determined for any reluctance profiles of actual SRMs. Experiment was carried out to verify the proposed method. The result supported suppression of the torque ripple and the acoustic noise by the proposed method.

The acoustic noise and vibration are major problems for Switched Reluctance Motor (SRM) to be used in electric vehicles, many industrial and household applications. Torque ripple is major cause of Acoustic noise and vibration in SRM. Discrete nature of current pulses applied to the motor causes ripple in the electromagnetic torque generated by a SRM. This Torque ripple can be reduced by design variation of stator/rotor magnetic structure of SRM, proper coordination of current pulses between incoming and outgoing phases. In this paper analysis vis-a-vis design for torque ripple variation has been carried out. Design optimization has been done with reduction in torque ripple from the original design. A V, U, m shape culvert's are made at the unaligned position of rotor for the optimized design and torque ripple is analyzed. FEM analysis is used to determine torque variation.

The important drawbacks of the Switched Reluctance Motor (SRM) are torque ripples, acoustic noise, and low power factor. High harmonic current and low power factor arising from the pulsating AC input current and the switching of voltage into the SRM phase winding. It will also lead to high torque ripple and acoustic noise. In the present work, we are using Vienna-type rectifier along with alternate Asymmetric H-Bridge converter for the SRM drive. It provides boosted DC-link voltage and enhancing the quality of the input current. Thus, the power factor (PF) of the SRM drive gets enhanced. This converter configuration also provides lesser Total Harmonic Distortion (THD). Thus, it will address the power quality improvement of the SRM drive. It is even more useful in torque ripple minimization. In this paper, for our analysis, we are considering 8/6 SRM Drive. It is modeled by using the MATLAB/Simulink environment.KeywordsSRM driveMATLAB/simulinkTorque ripple minimizationVienna rectifierPower factor improvement

This paper discusses development of a 3.5kW switched reluctance motor (SRM)-based electric compressor, focusing primarily on the design aspects of the SRM and the integrated controller. SRM's operation capability at high speed and high temperature in addition to increased price of rare earth magnets makes the SRM a viable alternative to the permanent magnet motor for electrically driven automotive air conditioning compressors. A compact and energy efficient scroll compressor is designed and constructed. Two feasible SRM topologies are considered in terms of efficiency, torque ripple, and acoustic noises. Compact drive electronics are designed and employed to drive the SRM-based compressor. Static and dynamic performance is validated by simulation and experiment.

Today, switched reluctance motors (SRMs) represent a promising technology for the long-term sustainability of electrified transportation, mainly due to their simpler structure, lower production cost, and robust configuration compared to other motor technologies. Notwithstanding, high acoustic noise and torque ripple are two performance imperfections that have prevented the widespread implementation of SRMs. This paper presents different structural design techniques to reduce the acoustic noise of an 8/6 SRM, while maintaining the electromagnetic performance of the machine. For each technique, a corresponding multiphysics FEA analysis of the motor’s performance is presented. The accuracy of the multiphysics model is confirmed experimentally using acoustic noise measurements obtained from a four-phase 8/6 SRM. Then, several structural techniques have been investigated on the 8/6 SRM represented in two main categories: stator-housing modifications and rotor modifications. The best design strategies are then combined to improve the acoustic noise level of the 8/6 SRM while maintaining its performance.

In the modern era, the fast necessities of the electrical drive are the indispensable part of the industries. This paper describes the modelling, analysis and study of various converter topologies fed switched reluctance motor (SRM) along with the speed control which is going to be achieved by the fuzzy logic controller. Now a days SRM is gaining more and more attention in recent high-speed industrial application due to its simplicity and ruggedness. Due to the double saliency nature of SRM drive, the torque pulsations are the vital challenge as the torque pulsations are relatively higher when compared to other conventional machines. The origin behind the high torque ripple in SRM is transferring the torque production from incoming phase to outgoing phase during the phase commutation period. Due to the presence of higher torque ripple, acoustic noise and oscillations are induced in the torque. To minimize the torque ripples, the current modulation technique plays the vital role which excites the stator phase sequentially. This paper proposes the different types of converter topologies such as asymmetric, C-dump and R-dump which are used to excite the stator phases of SRM with low torque ripples. Here the speed control can be achieved by the intelligent technique like fuzzy logic controller. The converters are to be designed using MATLAB/Simulink platform, and the mean values of torque and speed are to be compared and analysed. From the comparison, a proper converter is chosen for the SRM to maintain the minimum torque ripple.