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Journal articles on the topic 'Torque ripple'

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Author: Grafiati
Published: 4 June 2021
Last updated: 11 September 2023

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1

Chu, Guoyu, Rukmi Dutta, Alireza Pouramin, and Muhammed Fazlur Rahman. "Analysis of Torque Ripple of a Spoke-Type Interior Permanent Magnet Machine." Energies 13, no. 11 (June 5, 2020): 2886. http://dx.doi.org/10.3390/en13112886.

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This paper investigates the theoretical reasons behind the low torque ripple of a fractional-slot concentrated-winding (FSCW) spoke-type interior permanent-magnet (IPM) machine obtained via a genetic algorithm-based optimization. To better understand the torque performance of the IPMM, this paper uses the frozen permeability method to segregate the overall torque into four components—magnet torque, reluctance torque, cogging torque, and the torque caused by cross-magnetization. Equations and detailed procedures of the torque separation method are discussed in the paper. Analysis of the separated torque components reveals that the counteraction between ripples of different torques leads to the low torque ripple. At high-load conditions, the magnetic saturation alters the torque ripples caused by cross-magnetization to offset ripples of other components resulting in minimization of the overall torque ripple. A detailed parametric analysis of the geometric parameters was carried out to understand their effect in producing minimum torque ripple in the optimized design. In the end, a prototype was built and used for the verification of the torque separation method and the analytical findings based on it.
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2

Et.al, Ravisankar B. "Analysis and Prediction of Cogging Torque and ripples in output Torque of Permanent Magnet Synchronous Motor and Line Start Permanent Magnet Synchronous Motor." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 3 (April 10, 2021): 4586–95. http://dx.doi.org/10.17762/turcomat.v12i3.1851.

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Permanent magnet (PM) motors are rapidly replacing the squirrel cage induction motors for its energy efficient operation, smooth control and high power density. Although PM Motors are energy efficient, they are inherently affected by cogging torque and torque ripple. Magnetic alignment between teeth of stator and permanent magnet of rotors produce cogging torque. Torque ripple is a dynamic oscillation during steady-steady operation which leads to various mechanical anomalies like vibration, noise and rotor stress. Torque ripple is produced in PM motors because of non-sinusoidal distribution of flux, saturation, improper selection of slots etc., these ill effects will deteriorate the starting and steady-state performance of motors. So it is very vital to make analysis and prediction of cogging torque and torque ripples to make the motor more effective. Now a day's minimizing the torque ripples and cogging torque are gaining importance in PM motor designs. In this proposed work, the cogging torque analysis and torque ripple analysis of permanent magnet motor and line start permanent magnet motor has been done and reported.
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3

Thakur, Anant. "Improvement of Back EMF & Minimization of Torque Ripple of BLDC Motor." SMART MOVES JOURNAL IJOSCIENCE 5, no. 8 (August 6, 2019): 1–7. http://dx.doi.org/10.24113/ijoscience.v5i8.220.

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In Brushless DC (BLDC) motor minimized the torque ripple with the help of electronically based commutators. When torque ripple is minimizes then copper loss is also minimizes. In this paper, our main aspect to decrease the torque ripples & improved the back emf of brushless dc (BLDC) motor. This paper shows that the torque produced by the BLDC motors with trapezoidal Back EMF is constant under ideal condition. Due to freewheeling torque ripples are produced which is reduced. In this paper rotor position is determined by the Zero Crossing Detection (ZCD) of back emf. Unlike old methods of calculating Back emf of the BLDC by creating a virtual neutral point, a complimentary method is used. This method provides a wide range of speed. A pre conditioning circuit is proposed to rectify the back emf at very low speed. The rotor position can be determined even in stand still condition to minimize the torque ripple and designed to overcome the disadvantages from other torque ripple decrease methods.
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4

Huang, Zhao, and Han Xiang Cheng. "Implementing Iterative Learning Control to Reduce Torque Ripple of Permanent Magnet Synchronous Machine." Advanced Materials Research 301-303 (July 2011): 1676–81. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.1676.

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Permanent magnet synchronous machines (PMSM) are appealing candidates for many high-performance applications such as robotics, machine tools and other electrical propulsion system because of their attractive characteristics. PMSM have advantages of high power density, high torque-to-inertia ratio, and high electrical efficiency. However, the main disadvantage of PMSM is the torque ripples. Therefore, the study of how to compensate the torque ripples so as to improve the tracking performance of PMSM is very meaningful and necessary. In this paper, we focus on the control of a non-sinusoidal permanent magnet synchronous machine. First, we compare the various methods which to reduce the torque ripple. Then, we built a basic PMSM model. After that the Iterative Learning Control (ILC) algorithm is applied to compensate the torque ripple, and improve the tracking performance of the PMSM. The effectiveness of using ILC method to reduce torque ripple is demonstrated by simulink results.
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5

Akay, Ali, and Paul Lefley. "Torque Ripple Reduction Method in a Multiphase PM Machine for No-Fault and Open-Circuit Fault-Tolerant Conditions." Energies 14, no. 9 (May 2, 2021): 2615. http://dx.doi.org/10.3390/en14092615.

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This paper presents a method that has been developed to reduce the torque ripples under healthy and open-circuit fault-tolerant (OCFT) conditions for a multiphase permanent magnet (PM) machine. For smooth torque, both the phase current and the back electromotive force (back-EMF) should be purely sinusoidal. To improve the torque in a multiphase machine, higher-order current harmonics are injected, which are related to the harmonics in the back-EMF. For this reason, generally, multiphase machines are designed with higher-order back-EMF harmonics. However, these harmonics produce ripples in the torque. In light of this, a torque ripple cancellation method has been developed that first determines an additional current component from the harmonic content of the back-EMF and then injects these additional components to cancel the torque ripple. It has been found that this new torque ripple cancellation method works for both faultless and faulty conditions in a five-phase PM machine. The method has been validated using Finite Element Analysis, and the results are presented in this paper.
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6

Pushparajesh, V., Nandish B. M., and H. B. Marulasiddappa. "Hybrid intelligent controller based torque ripple minimization in switched reluctance motor drive." Bulletin of Electrical Engineering and Informatics 10, no. 3 (June 1, 2021): 1193–203. http://dx.doi.org/10.11591/eei.v10i3.3039.

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An inherent torque ripple characterizes switched reluctance technology from conventional technology. The ultimate aim of this paper is to reduce the torque ripple of the switched reluctance motor drive using genetic neural network controller based direct torque scheme. In the proposed controller network appropriate bits of data are chosen for training and testing. The proper selection of the learning rate and momentum will help in weight adjustment. Here the error is reduced which proves that the selection of voltage vectors from the vector table is precise and its results in better torque response over a wide range of speed. The simulation results reveal that the torque ripples vary between 3.25% to 1.7% for the variation in load torque and the drive speed. The experimental results for the proposed controller reveal that the torque ripple varies between 3.7% to 2.1%. Both the simulation and hardware results illustrate the efficiency of the controller.
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7

Qin, Yugui, Kaiyuan Wang, and Huiran Luo. "Fuzzy Direct Torque Control of Surface Permanent Magnet Synchronous Motor." Journal of Physics: Conference Series 2396, no. 1 (December 1, 2022): 012016. http://dx.doi.org/10.1088/1742-6596/2396/1/012016.

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Abstract To solve the problems of large torque and flux ripple in direct torque control (DTC) of permanent magnet synchronous motors (PMSM), a fuzzy controller is used to replace hysteresis comparators and switching tables in the DTC. Different from the conventional fuzzy controller which only outputs the angle or amplitude of the voltage vector, the controller adjusts the angle and value of the voltage vector at the same time in the surface PMSM DTC system is proposed. The inputs and output of the fuzzy controller are: stator flux, torque error, angle and amplitude of voltage vector in stator flux coordinate system. The simulation results of proposed fuzzy control system work normally. Compared with conventional fuzzy control systems, stator flux and torque ripples are decreased and only when motor speed is negative, torque ripple is a little higher. To suppress torque ripple at negative speed, two membership functions of torque error are designed and the fuzzy control system can select the proper membership function according to motor speed. Simulation results show adaptive fuzzy control system can effectively reduce torque and flux ripple in four quadrants.
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8

Li, Huanyu, Miao Li, Chenhong Zhengs, and Bingqian Chen. "Comparison between Modified MPC and DTC Control Method for Permanent Magnet Synchronous Motor." E3S Web of Conferences 115 (2019): 02004. http://dx.doi.org/10.1051/e3sconf/201911502004.

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Direct torque control (DTC) and model predictive control (MPC) are widely used in the control of permanent magnet synchronous motor (PMSM). However, DTC for PMSM can cause large torque ripples and flux ripples, high harmonic distortion of the stator current, and high acoustic noises. Compared to DTC, MPC considers all possible switching states which can reduce the ripples of torque and flux. MPC with one-step delay compensation for PMSM and DTC with one-step delay compensation and two hysteresis comparators for PMSM have been proposed to solve some drawbacks of these two controllers. This paper makes a detailed comparison between these two improved control methods through Simulink and hardware experiments results to analyse the four indicators-torque ripple, flux ripple, transient time and THD of inverter current.
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9

Ahmed, Dris, Bendjebbar Mokhtar, and Belaidi Aek. "DTC-ANN-2-level hybrid by neuronal hysteresis with mechanical sensorless induction motor drive using KUBOTA observer." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 1 (March 1, 2020): 34. http://dx.doi.org/10.11591/ijpeds.v11.i1.pp34-44.

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In this paper, DTC is applied for two-level inverter fed IM drives based on neuronal hysteresis comparators and The Direct Torque Control (DTC) is known to produce quick and robust response in AC drive system. However, during steady state, torque, flux and current ripple. An improvement of electric drive system can be obtained using a DTC method based on ANNs which reduces the torque and flux ripples, the estimated the rotor speed using the KUBOTA observer method based on measurements of electrical quantities of the motor. The validity of the proposed methods is confirmed by the simulation results.The THD (Total Harmonic Distortion) of stator current, torque ripple and stator flux ripple are determined and compared with conventional DTC control scheme using Matlab/Simulink environment.
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10

Sheng, Linhao, Guofeng Wang, Yunsheng Fan, Jian Liu, Di Liu, and Dongdong Mu. "An Improved Direct Predictive Torque Control for Torque Ripple and Copper Loss Reduction in SRM Drive." Applied Sciences 13, no. 9 (April 24, 2023): 5319. http://dx.doi.org/10.3390/app13095319.

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This paper introduces a direct predictive torque control (DPTC) method to minimize the torque ripple and copper loss of the switched reluctance motor (SRM). Generally, there is a problem with torque ripple during the SRM’s commutation. In this method, the commutation optimization is provided by a direct predictive torque control algorithm. Firstly, the reachable range of phase torques is predicted and the boundary of two continuous phases is modified. By dividing the torque range directly to determine the torque allocation set, the suppression of torque ripple becomes simple. Secondly, considering the optimization problem of copper loss during commutation, a cost function only related to the phase current is constructed. Further, the minimization of copper loss can be achieved by solving the cost function, and the work of setting weight parameters is not required. Finally, the proposed DPTC method is tested by simulation and experiment in a three-phase 12/8-pole SRM drive system and the results are compared with the existing predictive torque control methods. The results show that the proposed method has less torque ripple and copper loss, which effectively improves the torque control performance.
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11

Martinez, Javier, Klaus Krischan, and Annette Muetze. "Minimization of a SynRel’s oscillating torque by calculation of the appropriate skew angle." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 3 (May 2, 2017): 824–35. http://dx.doi.org/10.1108/compel-09-2016-0403.

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Purpose Synchronous Reluctance (SynRel) motors are known to suffer from excessive torque ripples. The classical way to avoid this drawback of the motor is skewing the slots. This paper aims to provide an analytic estimation of the best skew angle to minimize the ripples in such SynRel motors with tooth windings. The approach used in this paper consists of the minimization of the spectral components of the magnetic energy that cause these oscillation torques. The method was validated by means of a multi-slice finite element model (FEM). Design/methodology/approach An analytic model, based on permeance theory, is derived to analyse the electromagnetic phenomena taking place inside of the motor. This model allows the identification of the causes underlying the torque ripple production. Based on this understanding, the most suitable skew angle can be determined. The analytic method, together with the best skew angle, is validated by means of an FEM of a SynRel machine. Findings A method to determine the optimum skew angle for a SynRel machine is presented. It depends on the wave-number of the magnetic waves producing the torque ripple. It is twice the one typically chosen for induction machines. Practical/implications The proposed approach allows improving on the design methodology for the production of smoothly running SynRel machines. Originality/value The methodology utilized in this paper is based on the relationship between the mechanical torque and the magnetic energy stored in the motor (virtual work law). From this, the best skew angle to eliminate the magnetic energy causing torque ripple can be determined. It, therefore, proposes an effective alternative to the common use of inductance models to determine such angles.
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12

Kato, Masayuki. "Numerical Simulation on Electromagnetic Energy Harvester Oscillated by Speed Ripple of AC Motors." Energies 16, no. 2 (January 13, 2023): 940. http://dx.doi.org/10.3390/en16020940.

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The suppression of torque ripples in an interior permanent magnet synchronous motor (IPMSM) is essential to improve its efficiency and responsiveness. Here, we report on the development of an electromagnetic energy harvester incorporated into an IPMSM to suppress its torque ripples. The proposed harvester is driven to oscillations by the speed ripple of the AC motor. We derived the motion and circuit equations for the motor and the harvester according to Euler–Lagrange equations. We discussed the principle of electrical power generation and used MATLAB/Simulink numerical simulations to investigate the dynamic behavior of the proposed harvester. Our findings revealed that the active Coriolis force unnecessarily reduces the motor’s original torque, leading to unsuccessful power generation. Nevertheless, our results demonstrated that the reactive Coriolis force successfully suppresses the motor torque ripple.
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13

Borse, Payal S., Mohan P. Thakre, and Nishant P. Matale. "5-level torque-hysteresis controller for DTC based IM drive." International Journal of Engineering, Science and Technology 14, no. 3 (August 30, 2022): 104–11. http://dx.doi.org/10.4314/ijest.v14i3.12s.

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In the recent trade demand, the AC machines and drives are extensively utilized. Normally, the AC drives exploit with high efficacy as well as high performance. Among other things, one of the best control strategies is Direct torque control (DTC). For this article, the induction motor drive is projected very simple amended DTC scheme in accordance with the hysteresis controller. By the reason of its modest assembly & effective execution, DTC is used for AC as well as DC drive as associated to other monitoring structures. The presence of high ripple content in output torque for DTC scheme is only an obstacle. This article approaches extenuation of the ripples in torque by varying the predictable 5-level torque hysteresis controller used in DTC. The expansion of distinctive switching approach has been generated for chosen voltage vector. On the basis of ripple content simulation outcomes fulfilled in MATLAB/SIMULINK for hysteresis torque controller to minimized the ripples.
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14

Senthilnathan, A., P. Palanivel, and K. Ramash Kumar. "Mathematical Modelling and Torque Ripple Waning in BLDC Motor Using Outgoing-Phase Current Discharge Hysteresis Controlled ANFIS Controller." Mathematical Problems in Engineering 2022 (June 25, 2022): 1–21. http://dx.doi.org/10.1155/2022/3971695.

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This study focused on approaches for reducing torque ripples in Permanent Magnet Brushless Direct current motors (PMBLDC) to provide sophisticated performance and reliable machine drives for both industrial and consumer applications. Torque ripples are caused by current ripple, nonsinusoidal Back Electromotive Force (EMF), and cogging torque at the Brushless Direct Current Motor (BLDCM) output. Acoustic emissions are produced when the torque ripple creates vibrations in the mechanical system, which interacts with the motor housing and reduces the life span of the motor. The BLDC’s uses are limited due to these acoustic emissions. Proportional-Integral (PI), Fuzzy Logic Control (FLC), and Adaptive Neuro-Fuzzy Inference System (ANFIS) speed controller approaches were used to construct and analyze the mathematical model of the BLDC motor in the MATLAB environment. The Adaptive Neurofuzzy Inference System (ANFIS) speed control system has solved the shortcomings of the PI and Fuzzy Logic Control (FLC) techniques. Because of FLC interpolation and flexibility, ANFIS is one of the finest trade-offs between neural and fuzzy systems, allowing for smooth control. Model compactness, a smaller training set, and faster convergence are all benefits of the ANFIS approach over traditional feedforward NN. In this research proposal, a simple control approach based on outgoing phase current discharge hysteresis control (OGCDHC) with minimal torque ripple is presented.
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15

Shen, Jianxin, Dan Shi, Canfei Wang, Peng Li, Kang Wang, and Mengjia Jin. "Torque ripple analysis for IPM AC motors." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 33, no. 5 (August 26, 2014): 1514–26. http://dx.doi.org/10.1108/compel-09-2013-0294.

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Purpose – The purpose of this paper is to investigate a new cause of torque ripple in interior permanent magnet (IPM) alternating current (AC) motors, which is common but has hardly been studied. The paper also proposes a new method to suppress the total torque ripple. Design/methodology/approach – Besides the well-known cogging torque and mutual torque ripple, a new ripple which exists in the reluctance torque is found. It is verified with both analytical model and finite element analysis. Also, a novel method is proposed to reduce the reluctance torque ripple, with experimental validation. Findings – It is usually said that the winding inductances of an IPM AC motor vary sinusoidally with the rotor position, thus, the d-axis and q-axis inductances are constant, whilst the reluctance torque is smooth. However, in most practical motors, the inductances vary irregularly, causing a significant ripple in the reluctance torque. Moreover, in machine design, it is always desirable to suppress the cogging torque as much as possible. However, in this paper, it is proved that the cogging torque can remain and be used to cancel the reluctance torque ripple. Originality/value – Torque ripple in the IPM AC motors is usually reduced by suppressing the cogging torque and making both back electromotive forces and currents sinusoidal. However, this paper reveals the new cause of the torque ripple due to the irregular variation of winding inductances. Moreover, the paper gives a new method to cancel the reluctance torque ripple with the cogging torque.
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16

Xu, Junxin, Chaozhi Huang, Wensheng Cao, and Yuliang Wu. "Torque Ripple Control Strategy of Switched Reluctance Motor Based on BP Neural Network." Journal of Physics: Conference Series 2242, no. 1 (April 1, 2022): 012036. http://dx.doi.org/10.1088/1742-6596/2242/1/012036.

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Abstract Switched reluctance motor (SRM) has many advantages, but when the motor is running, the fixed turn-on angle will cause the torque ripple of the motor at different speeds and loads. Therefore, an torque ripple control strategy of switched reluctance motor based on BP neural network is proposed. Firstly, the nonlinear relationship among speed, load torque and opening angle is established by using the fitting generalization ability of BP neural network. In this step, the optimal angle data under the minimum pulsation needs to be obtained by simulation. After collecting data, select and classify the data, and then train and improve the neural network, That nonlinear relationship is introduced into the motor control strategy, so that the motor can automatically adjust its opening angle according to different rotational speeds and load torques and achieve the purpose of reducing torque ripple under different working conditions. Finally, the motor simulation model is built in Matlab/Simulink, and the results are analyzed. This control strategy can control and reduce torque ripple.
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17

Andriushchenko, Ekaterina, Ants Kallaste, Mohammad Hossain Mohammadi, David A. Lowther, and Hamidreza Heidari. "Sensitivity Analysis for Multi-Objective Optimization of Switched Reluctance Motors." Machines 10, no. 7 (July 11, 2022): 559. http://dx.doi.org/10.3390/machines10070559.

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The main issue of the switched reluctance motor (SRM) is its noise and vibration caused by high torque ripples on the rotor’s shaft. Many methods have been developed for improving the torque characteristic of the SRM. For example, design optimization is one of the promising approaches to the noise and vibration reduction of the SRM. Particularly, topology optimization (TO) of the stator and rotor can be highly beneficial to addressing the torque ripple issue. However, the TO of the SRM appears to be computationally demanding. To overcome this issue, this study proposes a method aiming to reduce the computational complexity of the TO through the reduction of the design space. Particularly, this paper presents a sensitivity analysis of a list of unique design parameters of the SRM and their influence on the average torque of the motor and the torque ripple of the motor. By applying the sensitivity analysis, the design space of the TO could be reduced, leading to a considerable decrease in the TO computational burden. Additionally, valuable conclusions on the geometrical parameters’ influences on the SRM torque and torque ripple have been drawn.
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18

Zhou, Jiawei, Ming Cheng, Wenfei Yu, and Wei Hua. "Analysis of Torque Ripple in V-Shape Interior Permanent Magnet Machine Based on General Airgap Field Modulation Theory." Energies 16, no. 12 (June 8, 2023): 4586. http://dx.doi.org/10.3390/en16124586.

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This paper proposes a novel torque ripple model of V-Shape interior permanent magnet (IPM) synchronous machine based on the general field modulation theory (GAFMT). Firstly, the magnetic field modulation behavior of a 12-stator-slot/8-rotor-pole (12/8) IPM machine is discussed, where the expressions of permanent-magnet-excited (PM-excited) and armature fields are derived. Secondly, the total torque ripple is divided into three components, namely, the PM-excited cogging torque, the armature cogging torque, and the modulation torque ripple. Additionally, the relationship between the field harmonics and the torque ripple is discussed based on the GAFMT. Then, a finite element analysis (FEA)-assisted dual fast Fourier transformation (FFT) method is proposed to obtain the accurate value of the field amplitude for torque ripple calculation. The field analysis results based on the GAFMT and the proposed torque ripple are then validated by comparing their results with those obtained from the FEA simulations, and a good agreement is observed, demonstrating the effectiveness of the field analysis and the proposed torque ripple model. Finally, experiments on a prototype 12/8 IPM machine demonstrate the validity of the torque ripple model, providing an effective method for torque ripple suppression of IPM machines.
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19

Zhang, Qian, Ying Zhao, Hao Mu, Shuai Liu, and Yi Heng Li. "Torque Ripple Suppression of Switched Reluctance Motor Based on Torque Sharing Strategy." Advanced Materials Research 960-961 (June 2014): 1086–90. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.1086.

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The torque ripple is the main disadvantage of switched reluctance motor (SRM). In order to reduce the torque ripple of SRM, and improve the performance of the system, the torque sharing strategy was combined with RBF neural network for the purpose of torque ripple suppression by controlling the winding current of each phase. In consideration of the possible error of network, the real-time current compensation was taken to compensate the loss of torque which could suppress the torque ripple of the system in further. The results show that he torque ripple of SRM was suppressed effectively.
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20

Shchur, Ihor, and Daniel Jancarczyk. "Electromagnetic Torque Ripple in Multiple Three-Phase Brushless DC Motors for Electric Vehicles." Electronics 10, no. 24 (December 13, 2021): 3097. http://dx.doi.org/10.3390/electronics10243097.

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This paper investigated an electromagnetic torque ripple level of BLDC drives with multiple three-phase (TP) permanent magnet (PM) motors for electric vehicles. For this purpose, mathematical models of PM machines of different armature winding sets-single (STP), dual (DTP), triple (TTP), and quadruple (QTP) ones of asymmetrical configuration and optimal angular displacement between winding sets were developed and corresponding computer models in the Matlab/Simulink environment were created. In conducted simulation, the influence of various factors on the electromagnetic torque ripple of the multiple-TP BLDC drives was investigated—degree of modularity, magnetic coupling between armature winding sets, and drive operation in open and closed-loop control systems. Studies have shown an increase of the electromagnetic torque ripple generated by one module in the multiple TP BLDC drives with magnetically coupled winding sets, due to additional current pulsations caused by magnetic interactions between the machine modules. However, the total electromagnetic torque ripples are much lower than in similar drives with magnetically insulated winding sets. Compared with the STP BLDC drive, the multiple TP BLDC drives with the same output parameters showed a reduction of the electromagnetic torque ripple by 27.6% for the DTP, 32.3% for the TTP, and 34.0% for the QTP BLDC drive.
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21

Salah, Wael, Dahaman Ishak, and Khaleel Hammadi. "PWM Switching Strategy for Torque Ripple Minimization in BLDC Motor." Journal of Electrical Engineering 62, no. 3 (May 1, 2011): 141–46. http://dx.doi.org/10.2478/v10187-011-0023-1.

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PWM Switching Strategy for Torque Ripple Minimization in BLDC Motor This paper describes a new PWM switching strategy to minimize the torque ripples in BLDC motor which is based on sensored rotor position control. The scheme has been implemented using a PIC microcontroller to generate a modified Pulse Width Modulation (PWM) signals for driving power inverter bridge. The modified PWM signals are successfully applied to the next up-coming phase current such that its current rise is slightly delayed during the commutation instant. Experimental results show that the current waveforms of the modified PWM are smoother than that in conventional PWM technique. Hence, the output torque exhibits lower ripple contents.
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22

Alaeddini, A., H. Tahanian, and A. Darabi. "Impact of Number of Phases on Electromagnetic Torque Characteristics of Transverse Flux Permanent Magnet Machines." Advanced Electromagnetics 8, no. 4 (December 17, 2019): 118–29. http://dx.doi.org/10.7716/aem.v8i4.1235.

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This paper presents an investigation on the influences of number of phases of Transverse Flux Permanent Magnet (TFPM) machines on the characteristics of developed electromagnetic torque. Electromagnetic torque is expressed in terms of the Fourier series of phase currents and internal voltages. After some algebraic and trigonometric calculations, a general equation is obtained that establishes a relationship between the electromagnetic torque ripples, number of phases and harmonic contents of both internal voltages and phase currents. This result is significant when it is required to design a few specific number of identical single-phase TFPM machines which finally they will be assembled such that to build a multi-phase machine with a minimum torque ripple. The design parameters of a case study Claw Pole TFPM machine are introduced with some details and a few FE based simulation results are given as the validations of the analytical approach of the present paper. The simulation results show clearly the impact of each harmonic of the internal voltages and phase currents on the torque ripple for various numbers of phases leading the designer to find out which number of single-phase machine combinations is the optimum one regarding the torque ripple.
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23

Jing, Benqin, Xuanju Dang, Zheng Liu, and Jianbo Ji. "Torque Ripple Suppression of Switched Reluctance Motor with Reference Torque Online Correction." Machines 11, no. 2 (January 28, 2023): 179. http://dx.doi.org/10.3390/machines11020179.

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High torque ripple dramatically affects the switched reluctance motor (SRM) application. To reduce the torque ripple, a reference torque neural network (RTNN) is proposed to adjust the reference torque online. Firstly, the RTNN is built on the torque sharing function (TSF) method. Furthermore, the RTNN is designed as a single-input and -output network. As the periodic relationship between the torque ripple and the rotor angle, the rotor angle constitutes the central node parameter of the implicit function in RTNN. Therefore, one-step adjustment of the RTNN can perform well at restraining reference torque. Lastly, the torque error is used to adjust the parameters of RTNN to reduce the torque ripple. In the MATLAB environment, through the simulation comparison with fuzzy torque and PD current compensation method, the effectiveness of RTNN at torque ripple suppression is proven with different loads and speeds.
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24

Wang, Dingyu, and Yiguang Chen. "Fault-Tolerant Control of Coil Inter-Turn Short-Circuit in Five-Phase Permanent Magnet Synchronous Motor." Energies 13, no. 21 (October 29, 2020): 5669. http://dx.doi.org/10.3390/en13215669.

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In the five-phase permanent magnet synchronous motor (PMSM) control system, the torque ripple caused by coil inter-turn short-circuit (ITSC)fault will make the motor performance worse. Due to the existence of the short-circuit current in the faulty phase and the third harmonic component in the permanent magnet flux linkage, the electromagnetic torque will contain even-order ripple components when the faulty phase is removed. Torque ripple also cause speed ripple. In this paper, the repetitive controller (RC) is used to perform proportional gain compensation for speed ripple. By designing the RC and connecting RC and proportional integral (PI) controller in parallel for the speed loop, the torque ripple amplitude can be reduced. It can be seen from the simulation and experimental results that the torque ripple suppression strategy based on RC can effectively suppress the torque ripple under ITSC fault.
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Jing, Jianli. "A Power Factor Correction Buck Converter-Fed Switched Reluctance Motor with Torque Ripple Suppression." Mathematical Problems in Engineering 2020 (July 13, 2020): 1–7. http://dx.doi.org/10.1155/2020/6730284.

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The switched reluctance motor (SRM) suffers the main drawback of torque ripples, and a buck converter-fed SRM motor drive has been proposed to suppress torque ripples and correct a power factor in this paper. The buck converter reduces the torque ripple by supplying appropriate DC-link voltage; meanwhile, the buck converter realizes a function of power factor correction at AC mains. An enhanced performance has been obtained on speed control and power quality improvement. An experimental SRM motor drive is formed, and the experimental results show that the proposed drive possesses an improved function with suppression of torque ripples and power factor correction.
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Lan, Yuanfeng, Yassine Benomar, Kritika Deepak, Ahmet Aksoz, Mohamed El Baghdadi, Emine Bostanci, and Omar Hegazy. "Switched Reluctance Motors and Drive Systems for Electric Vehicle Powertrains: State of the Art Analysis and Future Trends." Energies 14, no. 8 (April 8, 2021): 2079. http://dx.doi.org/10.3390/en14082079.

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This paper presents a detailed literature review on switched reluctance motor (SRM) and drive systems in electric vehicle (EV) powertrains. SRMs have received increasing attention for EV applications owing to their reliable structure, fault tolerance ability and magnet free design. The main drawbacks of the SRM are torque ripple, low power density, low power factor and small extended speed range. Recent research shows that multi-stack conventional switched reluctance motors (MSCSRM) and multi-stack switched reluctance motors with a segmental rotor (MSSRM-SR) are promising alternative solutions to reduce torque ripples, increase torque density and increase power factor. Different winding configurations such as single-layer concentrated winding (SLC), single layer mutually coupled winding (SLMC), double layer concentrated winding (DLC), double layer mutually coupled winding (DLMC) and fully-pitched winding (FP) are introduced in the literature in recent years to increase average torque and to decrease torque ripples. This research analyzes winding methods and structure of the SRMs, including conventional and segmental rotors. They have been compared and assessed in detail evaluation of torque ripple reduction, torque/power density increase, noise/vibration characteristics and mechanical structure. In addition, various drive systems are fully addressed for the SRMs, including conventional drives, soft-switching drives, drives with standard inverters and drives with an integrated battery charger. In this paper, the SRM control methods are also reviewed and classified. These control methods include strategies of torque ripple reduction, fault-diagnosis, fault-tolerance techniques and sensorless control. The key contributions of this paper provide a useful basis for detailed analysis of modeling and electromechanical design, drive systems, and control techniques of the SRMs for EV applications.
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Xu, Xuefeng, Bingyi Zhang, and Jiacheng Wu. "Research on Synergistic Reduction of Cogging Torque and Ripple Torque of Interior Permanent Magnet Synchronous Motor Based on Magnetic Field Harmonic Offset Method." Electronics 12, no. 16 (August 18, 2023): 3499. http://dx.doi.org/10.3390/electronics12163499.

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This paper presents a method for reducing the cogging torque and ripple torque of interior permanent magnet synchronous motor (IPMSM) based on the magnetic field harmonic offset method. This method establishes the internal correlation between cogging torque harmonics and ripple torque harmonics. The suppression or cancellation of magnetic field harmonics in the rotor pole is utilized as transmission link to simultaneously weaken or eliminate lower order harmonics of cogging torque and ripple torque, which can improve operating quality of the IPMSM and obtain an acceptable total average torque. A mathematical and physical model of harmonic offset method for cogging torque is established, the distribution characteristics of permeability harmonics and field harmonics that affect cogging torque are analyzed, the analytical expression for the electromagnetic torque of the IPMSM including reluctance torque is derived, and the collaborative suppression mechanism of cogging torque and ripple torque, as well as common solutions, are studied. Finally, the suppression law of cogging torque and operating ripple torque is verified by the finite element simulation, and the compromise selection principle of permanent magnetic pole is summarized. Due to the absence of the average torque of motor in the offset method, the effects of effective pole arc of the combined rotor on the torque ripple and torque-speed characteristic curve of the IPMSM are compared and evaluated.
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28

Marks, Mitchell. "Measurement and Analysis of Torque Ripple in Inverter Driven Electric Machines." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (August 1, 2021): 227–35. http://dx.doi.org/10.3397/in-2021-1373.

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Torque ripple in electric machines can create both noise and vibration. While torque ripple is often well understood theoretically, it is much more difficult to accurately predict and measure. Often torque ripple is measured as a function of magnets and slot interaction at extremely low speed, but this can only be extrapolated to understand its implications for noise and vibration and is not useful for understanding torque response during dynamic scenarios like a change in load. The slow speed method of measurement also neglects possible switching effects on the torque profile. This paper will explore challenges in measuring the different sources of torque ripple and give an alternative method to measure torque ripple at higher speeds and also dynamically. This will include best practices and examples.
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29

Hamidia, Fethia, Abdelakader Larabi, and Mohamed Seghir Boucherit. "Direct Torque Control Using Fuzzy and Neural as Switching Vector Selector for Doubly Fed IM." Advanced Materials Research 646 (January 2013): 134–38. http://dx.doi.org/10.4028/www.scientific.net/amr.646.134.

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The conventional Direct Torque Control approach has some drawbacks such as high torque ripple and switching frequency, which is varying with speed, load torque and the selected hysteresis bands, this paper discuss the application of neural network and fuzzy logic on DTC of Doubly fed induction motor DFIM, the proposed techniques having the advantages of low torque and flux ripples. Simulation results emphasize the good performance of the fuzzy and neural techniques.
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Hajnrych, Stanisław J., Rafał Jakubowski, and Jan Szczypior. "Yokeless Axial Flux Surface-Mounted Permanent Magnets Machine Rotor Parameters Influence on Torque and Back-Emf." Energies 13, no. 13 (July 2, 2020): 3418. http://dx.doi.org/10.3390/en13133418.

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The paper presents the results of a 3D FEA simulations series of a dual air gap Axial Flux (AF) electric machine with Surface-Mounted Permanent magnets (SPM) with parameterized rotor geometry. Pole number and pole span influence on back-emf, as well as cogging and ideal electromagnetic torques angular characteristics were investigated for each model with the common segmented yokeless stator with concentric windings. Synchronous and BLDC drives supply were used to estimate back-emf distortion. Ideal torque ripple and cogging torque spectra were analyzed. It was concluded that the number of poles closer to the number of slots with ~0.8 pole span tends to yield good torque density with the lowest cogging torque, back-emf distortion and ideal torque ripple.
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31

K. ArulKumar, N. Hemalatha, T. Deepika Vyshnavi, C. Gangaraju, and G. Vamsi. "Intelligent Power Controller for BLDC Motor." Journal of Electrical Engineering and Automation 5, no. 3 (September 2023): 329–42. http://dx.doi.org/10.36548/jeea.2023.3.003.

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Now-a-days BLDC motors are used in many applications including electric vehicles. The battery-operated vehicles are gaining popularity as people become increasingly aware of the adverse effects of fossil fuel-powered vehicles on the environment. These battery- operated vehicles are equipped with the Brushless direct current (BLDC) motor due to its high efficiency. Many researchers carried out researches to regulate the operations of BLDC motors. In this research the control of BLDC motor is analyzed. While taking into account reliability and durability, the BLDC motor fails to provide an increased fault tolerance, with decreased electromagnetic interference, acoustic noise, flux ripples, and torque ripple. Torque ripple in a BLDC motor’s is mainly caused due to the variation in the interactions across the stator and rotor as well the electromagnetic fields. So, the research has come up with the solution to the torque ripple using the controllers. By using intelligent power controllers, the output performance can be improved with good power quality and efficiency.
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32

Sun, Chuanyu, Hang Yang, Shangke Han, Hongchang Ding, Jiaqing Li, and Ning Han. "Control System Design for 16/6/8 Double-Stator Bearingless Switched Reluctance Motor." Mathematical Problems in Engineering 2021 (August 30, 2021): 1–15. http://dx.doi.org/10.1155/2021/4727917.

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The 16/6/8 double-stator bearingless switched reluctance motor (DSBSRM) is used as the object of study in this paper. To solve the problem of torque and levitation force ripples in this motor, a control system direct force control (DFC) and direct instantaneous torque control (DITC) based on the torque sharing function (TSF) are proposed. With the strong nonlinearity and approximation capability of radial basis function neural networks, the torque and levitation force observer are designed. The observed torque and levitation forces are used as feedback for the internal loop control, which is combined with the external loop control to make a double closed-loop control. In order to further improve the output torque and system robustness and suppress the torque ripple in steady-state process, the motor winding method is optimized and a set of switching angles is added on the basis of TSF. The simulation results verify the effectiveness and superiority of the proposed control method. It effectively suppresses speed ripple and reduces torque and levitation force fluctuations and rotor radial displacement jitter.
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33

Zhang, Gan, Wenfei Yu, Wei Hua, Ruiwu Cao, Hongbo Qiu, and Aili Guo. "The Design and Optimization of an Interior, Permanent Magnet Synchronous Machine Applied in an Electric Traction Vehicle Requiring a Low Torque Ripple." Applied Sciences 9, no. 17 (September 3, 2019): 3634. http://dx.doi.org/10.3390/app9173634.

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An internal permanent magnet synchronous machine (IPMSM) was designed for heavy-load traction vehicles applied in port transportation. Based on finite element analysis (FEA), the rotor iron core topology was optimized with the most attention paid to cogging torque and torque ripple. The influences of the iron core on the air-gap magnetic flux density, the back electro-motive-force harmonic, the cogging torque and the torque ripple were investigated. The design scheme of minimizing cogging torque and output torque ripple was obtained. Focused on the relationship between the rotor parameters and the torque ripple, the relative sensitivity factor was proposed and analyzed. Finally, the torque ripple was reduced from 14.4% to 3.84%, after further optimization of the rotor design parameters. The reliability and stability of the IPMSM were also covered. Additionally, the experimental study of the prototype was carried out to verify the FEA results.
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34

Li, Guo Sheng, Jia Dan Wei, Chang Chun Chen, Bo Zhou, and Chu Han. "An Optimized Angle Control Strategy for Doubly Salient Electro-Magnetic Motor Based on the Half-Bridge Converter." Advanced Materials Research 383-390 (November 2011): 2083–91. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.2083.

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The doubly salient electro-magnetic motor (DSEM) suffers from significant torque ripples when operating in the conventional angle control method. To weaken the effects of the torque ripples, the ripple generation mechanism is first analyzed in this paper. Then, the operation principle and steady state of the split-capacitor in DC-link of the half-bridge converter are discussed in detail, thus an optimized control strategy of the half-bridge converter is proposed for the DSEM drives. The simulation and experimental results verify that the optimized angle control strategy can alleviate the torque ripples effectively and improve the motor performance.
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35

Tao, Ruichao, Jie Ma, and Hui Zhao. "Torque Ripple Minimization in PMSM Based on an Indirect Adaptive Robust Controller." Mathematical Problems in Engineering 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/9512351.

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This paper addresses the problem of torque ripple minimization in permanent magnet synchronous motor (PMSM), which plays an important role in modern aerospace industry. Accurate motion control and disturbance compensation are challenging issues of PMSM systems, where the nonlinear disturbances are quite complicated and various uncertainties exist. To overcome these control problems, based on the adaptive robust control (ARC) algorithm, an indirect adaptive robust controller (IARC) with a robust recursive least square (RRLS) adaption law is proposed as a solution. A modified PMSM model which indicates the torque ripple generation is first derived. The IARC in current loop is then described, holding the good tracking performance of ARC algorithm and minimizing the torque ripples while speed tracking. The RRLS adaption law in IARC is synthesized based on modified model and then a correction factor is added to enhance the robustness of this adaptation law. This can enable the better parametric estimation and adaptive compensation to minimize the torque ripples. The stability of the system with the proposed controller is proved. Finally, the effectiveness of the proposed method is demonstrated by the simulation results.
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36

Gudey, Satish Kumar, Mohan Malla, Kiran Jasthi, and Srinivasa Rao Gampa. "Direct Torque Control of an Induction Motor Using Fractional-Order Sliding Mode Control Technique for Quick Response and Reduced Torque Ripple." World Electric Vehicle Journal 14, no. 6 (May 25, 2023): 137. http://dx.doi.org/10.3390/wevj14060137.

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The performance of electric drive propulsion systems is often degraded by the high torque and flux ripples of an electric drive. Traditional control methods, such as proportional plus integral (PI) controllers and classical sliding mode controllers (SMCs), have shown good response and reduced torque ripple, but even lower ripple content at low voltage levels is required for its effective use in electric vehicle (EV) applications. In this paper, a new direct torque control (DTC) technique with space vector pulse width modulation (SVPWM) using fractional-order sliding mode control (FOSMC) for a two-level inverter (2LI) at constant switching frequency is proposed. The effectiveness of this proposed controller is compared with a conventional proportional-integral controller and a conventional sliding mode controller (SMC). Simulink models are developed using MATLAB version R2018a to analyze the robustness of the proposed control strategy. Simulation results demonstrate the advantage of the proposed controller in reducing the torque ripples at steady state with less settling time during sudden load change conditions. The proposed control technique also demonstrates better utilization of the stator flux through flux trajectory waveforms.
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37

Aladetola, Olaoluwa Demola, Mondher Ouari, Yakoub Saadi, Tedjani Mesbahi, Moussa Boukhnifer, and Kondo Hloindo Adjallah. "Advanced Torque Ripple Minimization of Synchronous Reluctance Machine for Electric Vehicle Application." Energies 16, no. 6 (March 14, 2023): 2701. http://dx.doi.org/10.3390/en16062701.

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The electric machine and the control system determine the performance of the electric vehicle drivetrain. Unlike rare-earth magnet machines such as permanent magnet synchronous machines (PMSMs), synchronous reluctance machines(SynRMs) are manufactured without permanent magnets. This allows them to be used as an alternative to rare-earth magnet machines. However, one of the main drawbacks of this machine is its high torque ripple, which generates significant acoustic noise. The most typical method for reducing this torque ripple is to employ an optimized structural design or a customized control technique. The objective of this paper is the use of a control approach to minimize the torque ripple effects issue in the SynRM. This work is performed in two steps: Initially, the reference current calculation bloc is modified to reduce the torque ripple of the machine. A method for calculating the optimal reference currents based on the stator joule loss is proposed. The proposed method is compared to two methods used in the literature, the FOC and MTPA methods. A comparative study between the three methods based on the torque ripple rate shows that the proposed method allows a significant reduction in the torque ripple. The second contribution to the minimization of the torque ripple is to propose a sliding mode control. This control suffers from the phenomenon of “Chattering” which affects the torque ripple. To solve this problem, a second-order sliding mode control is proposed. A comparative study between the different approaches shows that the second-order sliding mode provides the lowest torque ripple rate of the machine.
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38

Grebennikov, Nikolay, and Alexander Kireev. "Versions of Switched Reluctance Generatior Design at a Constant Stator Configuration." International Journal of Power Electronics and Drive Systems (IJPEDS) 6, no. 1 (March 1, 2015): 65. http://dx.doi.org/10.11591/ijpeds.v6.i1.pp65-69.

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The investigation of the influence of the number of phases of switched reluctance generator (SRG) to the pulse of electromagnetic torque was carried out. The computer model was created. The amplitude of torque ripples reduces to 6 times with increasing of the ripple frequency to 5 times, that is more acceptable in terms of requirements.
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39

Hu, Lian Jun, Xiao Hui Zeng, Hong Song, Xiao Long Huang, and Ming Liu. "The Research on Suppression Strategies for Electromagnetic Torque Ripples of Brushless DC Motors." Advanced Materials Research 910 (March 2014): 327–31. http://dx.doi.org/10.4028/www.scientific.net/amr.910.327.

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Despite of its remarkable active performances, brushless DC motors, which are widely used in mechanical engineering, have an obvious disadvantage in its high electromagnetic torque ripples. In the paper, a ripple suppression method based on predictive controls of stator currents is proposed according to analysis of causes electromagnetic torque ripples generate in commutation periods of brushless DC motors. First of all, a relative accurate prediction is acquired through DC motor on-line parameter corrections based on generalized predictive control algorithms. Then rolling optimizations make tracking errors and control qualities optimized for best control effects. And finally, minimum electromagnetic torque ripples are achieved. The simulation results show that torque ripples can be suppressed effectively with improved reliabilities by using the method proposed.
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40

Surakasi, Balamurali, Raavi Satish, Balamurali Pydi, Hossam Kotb, Mokhtar Shouran, and Bdereddin Abdul Samad. "A Novel Methodology to Enhance the Smooth Running of the PM BLDC Motor Drive Using PWM-PWM Logic and Advance Angle Method." Machines 11, no. 1 (December 30, 2022): 41. http://dx.doi.org/10.3390/machines11010041.

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This paper addresses the active torque ripple compensation of a permanent magnet brushless direct-current motor (PMBLDC) drive with a new pulse width modulation (PWM) technique and advance angle method. Torque ripple is a well-known problem in BLDC motors which is produced by a discrepancy between the stator current and the back electromotive force (back-emf) waveforms. The advanced angle method proposed in this paper generates a maximum torque in the PM BLDC motor by decreasing the displacement between the phase voltage and phase current in proportion to the load. Further, a simple and comprehensive PWM-PWM logic is proposed in this paper to reduce the torque ripples. The test results show that the BLDC motor drive achieves good steady-state performance while maintaining a quick dynamic response. The performance of the PWM-PWM logic and advance angle method, have been tested and compared with the practical results for the characteristics of DC bus voltage, DC bus current, electromagnetic torque, shaft torque, mechanical torque, phase voltage, phase current and PWM signal.
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41

Zhao, Xinqi, Yong Zhai, and Youtong Zhang. "Torque Ripple Suppression Strategy of Electromechanical Coupling System of Hybrid Electric Towing Vehicle Based on Feedforward Control." Journal of Physics: Conference Series 2283, no. 1 (June 1, 2022): 012015. http://dx.doi.org/10.1088/1742-6596/2283/1/012015.

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Abstract Aiming at the problem of output torque ripple of power split engine motor power system coupled with planetary gear train, based on the dynamic model of the system, the torque ripple suppression algorithm considering coupling device and engine instantaneous torque observer based on engine instantaneous torque are designed. In order to solve the problem that a single control method fails to meet the steady-state performance and response time at the same time, a torque ripple suppression strategy of electromechanical coupling system based on feedforward control is proposed. Combined with the modeling of GT-power and MATLAB / Simulink platform, the rated operating points are simulated in coordinated driving mode and input split mode respectively. The results show that the control strategy can reduce the output torque ripple of the ring gear by 25.46% and 19.34% respectively in coordinated driving mode and input split mode. The control strategy can reduce the output torque ripple by 14.30% and speed ripple by 37.32% in the dynamic condition of PTO intervention.
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42

Zhao, Xinqi, Yong Zhai, and Youtong Zhang. "Torque Ripple Suppression Strategy of Electromechanical Coupling System of Hybrid Electric Towing Vehicle Based on Feedforward Control." Journal of Physics: Conference Series 2283, no. 1 (June 1, 2022): 012015. http://dx.doi.org/10.1088/1742-6596/2283/1/012015.

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Abstract Aiming at the problem of output torque ripple of power split engine motor power system coupled with planetary gear train, based on the dynamic model of the system, the torque ripple suppression algorithm considering coupling device and engine instantaneous torque observer based on engine instantaneous torque are designed. In order to solve the problem that a single control method fails to meet the steady-state performance and response time at the same time, a torque ripple suppression strategy of electromechanical coupling system based on feedforward control is proposed. Combined with the modeling of GT-power and MATLAB / Simulink platform, the rated operating points are simulated in coordinated driving mode and input split mode respectively. The results show that the control strategy can reduce the output torque ripple of the ring gear by 25.46% and 19.34% respectively in coordinated driving mode and input split mode. The control strategy can reduce the output torque ripple by 14.30% and speed ripple by 37.32% in the dynamic condition of PTO intervention.
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43

Gallardo, César, Carlos Madariaga, Juan A. Tapia, and Michele Degano. "A Method to Determine the Torque Ripple Harmonic Reduction in Skewed Synchronous Reluctance Machines." Applied Sciences 13, no. 5 (February 24, 2023): 2949. http://dx.doi.org/10.3390/app13052949.

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In this paper, a discrete skew methodology is presented to understand the effect of skewing angle on electromagnetic torque in SynRM design. A new approach is proposed to estimate the amplitude of each torque ripple component as a function of skewing angle. The reduction factor for each harmonic component is derived in general form, allowing for the determination of overall torque ripple waveform. The validity of the proposed method is evaluated through the examination of two SynRMs, resulting in a torque ripple reduction of up to 70%. The results obtained through the use of a proposed analytical ripple reduction estimator and FEA evaluation showed good agreement. The proposed skewing technique was applied on a previously optimized triple-barrier SynRM with a positive outcome: a consistent torque ripple reduction tackling relevant harmonic components. The analysis of harmonic distribution of torque ripple is mandatory for the selection of the optimal skewing strategy when following the proposed method, with two-step skewing recommended for mostly-purely-sinusoidal torque waveforms, and multi-step skewing recommended for machines with multiple higher-magnitude harmonic components.
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44

Ji, Xuande, Daqing He, and Yunwang Ge. "Study of Direct Torque Control Scheme for Induction Motor Based on Torque Angle Closed-Loop Control." Open Electrical & Electronic Engineering Journal 9, no. 1 (November 11, 2015): 600–609. http://dx.doi.org/10.2174/1874129001509010600.

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For disadvantages of the large flux and torque ripple and current waveform distortion of Direct Torque Control (BASIC-DTC), the DTC scheme for induction motor based on torque angle closed-loop control was presented and the proposed scheme was realized with three methods of torque angle closed-loop control. The main characteristics of three methods of torque angle closed-loop control for the proposed scheme was analyzed, emphasizing their advantages and disadvantages. The performance of three methods of torque angle closed-loop control for the proposed scheme was studied in terms of flux and torque ripple, current waveform distortion and transient responses. Simulation results showed that the proposed scheme improves the performance of induction motor BASIC-DTC by combining low flux ripple, low torque ripple and low current waveform distortion’s characteristics with fast dynamics.
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45

Wang, K., Z. Q. Zhu, G. Ombach, M. Koch, S. Zhang, and J. Xu. "Torque ripple reduction of synchronous reluctance machines: using asymmetric flux-barrier." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 34, no. 1 (January 5, 2015): 18–31. http://dx.doi.org/10.1108/compel-11-2013-0367.

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Purpose – The purpose of this paper is to reduce the torque ripple but not to decrease the average torque of synchronous reluctance machines by using one step or more than two axially laminated rotors with asymmetric flux-barrier. Design/methodology/approach – A 24-slot four-pole synchronous reluctance machine with overlapping windings and asymmetric flux-barrier in the rotor is, first, described and designed by finite element (FE) method for maximizing average torque. The dimensions of asymmetric flux-barrier including the pole span angle and flux-barrier angle will be optimized to minimize the torque ripple and its influence on the average torque is also investigated by FE analysis. The impact of current angle on the average torque and torque ripple are also analysed. The step laminations together with the asymmetric flux-barrier are employed for further torque ripple reduction which can consider the both rotation directions. Findings – The torque ripple of synchronous reluctance machine can be significantly reduced by employing asymmetric flux-barrier but the average torque is not reduced. Research limitations/implications – The purely sinusoidal currents are applied in this analysis and the effects of harmonics in the current on torque ripple are not considered in this application. The 24-slot/four-pole synchronous reluctance machine with single-layer flux-barrier has been employed in this analysis, but this work can be continued to investigate the synchronous reluctance machine with multilayer flux-barrier. This asymmetric flux-barrier can be easily applied to permanent magnet (PM)-assisted synchronous reluctance machine and the interior PM machine with flux-barrier in the rotor, since the space which is used for PM insertion is the same as the SynRM machines. Originality/value – This paper has analysed the torque ripple and average torque of synchronous reluctance machines with asymmetric flux-barrier and step laminations with asymmetric flux-barrier. The torque ripple can be reduced by this flux-barrier arrangement. The difference of this technique with the other techniques such as stator/rotor skew is that the average torque can be improved.
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46

Krishnan, Geethu, Moshe Sitbon, and Shijoh Vellayikot. "Enhanced Power Factor Correction and Torque Ripple Mitigation for DC–DC Converter Based BLDC Drive." Electronics 12, no. 16 (August 21, 2023): 3533. http://dx.doi.org/10.3390/electronics12163533.

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A novel approach to the design of power factor correction (PFC) and torque ripple minimization in a brushless direct current (BLDC) motor drive with a new pulse width modulation (PWM) technique is demonstrated. The drive was designed to have a better power factor (PF) and less torque ripple. On the other hand, the modified Zeta converter is used to enhance the power factor of the proposed system. The modified Zeta converter is operated in discontinuous inductor current mode (DICM) by using a voltage follower technique, which only needs a voltage sensor for power factor correction (PFC) operation and DC-link voltage control. The output voltage of the VSI is determined by switching patterns generated by the PWM-ON-PWM switching strategy, and it reduces the torque ripples. The proposed drive is developed and simulated in a MATLAB/Simulink environment. The power factor of 0.9999 is produced by the PFC modified zeta converter topology and the PWM-ON-PWM scheme reduce the torque ripple in the commutation region by 34.2% as compared with the PWM-ON scheme. This demonstrates the effectiveness of the suggested control method.
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Yu, Hong Xia, and Chuang Li. "Bus-Clamping Based Improved Discrete Duty Ratio Control Technology of Direct Torque Control for Induction Motors." Applied Mechanics and Materials 541-542 (March 2014): 1177–84. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.1177.

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One of the disadvantages of traditional direct torque control is high torque ripple, A method of reduce torque ripple was proposed basing bus-clamping and duty ratio control technique in this paper. Firstly, the switch vector table with bus-clamping technology was improved by analyzing the role of zero voltage vector to reduce torque ripple in different sector of voltage. Secondly, on the base of combing the improved bus-clamping direct torque control (BCDTC) and discrete duty ratio control (DDRC), a new switch vector table with discrete duty ratio and bus clamping was designed by analyzing the role of zero voltage vector to reduce torque ripple in different speed range. Finally, simulations are performed to verify the proposed strategies.
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48

Liu, Xiao Hong, and You Tong Zhang. "Study on Engine Idling Torque and Speed Ripple Cancellation of HEV ." Applied Mechanics and Materials 470 (December 2013): 559–62. http://dx.doi.org/10.4028/www.scientific.net/amm.470.559.

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According to the character of the torque and speed ripple of the engine idling analysed from its Fourier transformed, use motor torque to compensates the primary and second harmonics of Fourier transform of the output net torque during engine idle in HEV. The simulation results show that the engine torque ripple and speed ripple decrease greatly, so the system smoothness and economic efficiency were achieved.
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Anjan Ku., Sahoo, and Jena Ranjan Ku. "Improved DTC strategy with fuzzy logic controller for induction motor driven electric vehicle." AIMS Electronics and Electrical Engineering 6, no. 3 (2022): 296–316. http://dx.doi.org/10.3934/electreng.2022018.

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<abstract><p>In the near future, zero-emission transportation is anticipated to be implemented in an effort to reduce the major pollutants caused by road transportation. This enormous endeavor will be impossible until all modes of transport are electrified. The induction motor-fed direct torque controller is widely used for EV applications due to its fast torque response and simplicity. However, ripples in torque and flux and current harmonics are the major issues related to DTC. The fuzzy-based DTC replaces the hysteresis comparators and the switching table with fuzzy logic blocks to realize fuzzy DTC control, which improves the system's performance. This paper presents an enhanced fuzzy logic control strategy of induction motor for electric vehicle applications. The main objective is to enhance the system's performance by reducing torque and flux ripples. Both the conventional and fuzzy-based DTC are simulated with MATLAB/SIMULINK, followed by a comparative assessment to validate the effectiveness of the proposed approach for both steady-state and transient operations. The results indicate improvements in torque ripple, flux ripple, and speed ripples by 69%, 10%, and 85%, respectively. Due to the reduction in ripples, there is also an improvement in the THD of the stator current by 17%. During transient, an average improvement of integral square error for torque and speed is 8% and 12%, respectively. Further, the proposed method is validated using EUDC and HWFET drive cycles, demonstrating a reduction in battery energy demand.</p></abstract>
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Ladghem Chikouche, Brahim, Kamel Boughrara, and Rachid Ibtiouen. "Permanent magnet shaping for cogging torque and torque ripple reduction of PMSM." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, no. 6 (November 5, 2018): 2232–48. http://dx.doi.org/10.1108/compel-11-2017-0482.

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Abstract:
Purpose This paper aims to the improvement of permanent magnet shape in the popular permanent magnet synchronous machine (PMSM) is proposed in this paper in view to mitigate cogging torque magnitude and torque ripple. Design/methodology/approach A two-dimensional exact analytical approach of magnetic field distribution is established for the PMSM considering magnet shape and slot opening. The optimal magnet shape is constituted of small number of layers stacked radially. The thickness of each magnet layer is considered equal to about one mm or more; however, a parametric study was performed to determine pole pitch ratio value. The finite element method is used to validate the analytical results. Findings Cogging torque peaks and torque ripples can be mitigated significantly more than 90 per cent compared to results issued from machine having classical magnet shape. Raising the number of magnet layers can give better results. The results of this paper are compared also with those issued from the machine having sinusoidal magnet shape and give a good solution. Originality/value A new technique for cogging torque and torque ripple mitigation is proposed in this paper by changing permanent magnet shape. The proposed final magnet shape is constituted of a set of stacked and well-dimensioned layers relative to the opening angle.
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