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Auteur : Grafiati
Publié le 8 juin 2024

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1

Owen, R. L., Z. Q. Zhu, J. B. Wang, D. A. Stone et I. Urquhart. « Review of Variable-flux Permanent Magnet Machines ». Journal of international Conference on Electrical Machines and Systems 1, no 1 (1 mars 2012) : 23–31. http://dx.doi.org/10.11142/jicems.2012.1.1.023.

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2

Huang, L. R., J. H. Feng, S. Y. Guo, J. X. Shi, W. Q. Chu et Z. Q. Zhu. « Fast design method of variable flux reluctance machines ». CES Transactions on Electrical Machines and Systems 2, no 1 (mars 2018) : 152–59. http://dx.doi.org/10.23919/tems.2018.8326462.

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3

Vansompel, Hendrik, Peter Sergeant, Luc Dupre et Alex Van den Bossche. « Axial-Flux PM Machines With Variable Air Gap ». IEEE Transactions on Industrial Electronics 61, no 2 (février 2014) : 730–37. http://dx.doi.org/10.1109/tie.2013.2253068.

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4

Basnet, Bigyan, et Pragasen Pillay. « Torque Pulsation Reduction During Magnetization in Variable Flux Machines ». IEEE Journal of Emerging and Selected Topics in Power Electronics 10, no 2 (avril 2022) : 1703–11. http://dx.doi.org/10.1109/jestpe.2021.3135363.

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5

Huang, L. R., J. H. Feng, S. Y. Guo, J. X. Shi, W. Q. Chu et Z. Q. Zhu. « Analysis of Torque Production in Variable Flux Reluctance Machines ». IEEE Transactions on Energy Conversion 32, no 4 (décembre 2017) : 1297–308. http://dx.doi.org/10.1109/tec.2017.2698836.

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6

Zhou, Zicheng, Hao Hua et Ziqiang Zhu. « Flux-Adjustable Permanent Magnet Machines in Traction Applications ». World Electric Vehicle Journal 13, no 4 (29 mars 2022) : 60. http://dx.doi.org/10.3390/wevj13040060.

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This paper overviews the recent advances in flux-adjustable permanent magnet (PM) machines for traction applications. The flux-adjustable PM machines benefit from the synergies of the high torque density and high efficiency in conventional PM machines as well as the controllable air-gap field in wound-field machines, which are attractive for the traction applications requiring enhanced capabilities of speed regulation and uncontrolled voltage mitigation. In general, three solutions have been presented, namely the hybrid excited (HE), the mechanically regulated (MR), and the variable flux memory (VFM) machines. Numerous innovations were proposed on these topics during the last two decades, while each machine topology has its own merits and demerits. The purpose of this paper is to review the development history and trend of the flux-adjustable PM machines, with particular reference to their topologies, working mechanism, and electromagnetic performance.
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Liu, X., et Z. Q. Zhu. « Comparative Study of Novel Variable Flux Reluctance Machines With Doubly Fed Doubly Salient Machines ». IEEE Transactions on Magnetics 49, no 7 (juillet 2013) : 3838–41. http://dx.doi.org/10.1109/tmag.2013.2242047.

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8

Ibrahim, Maged, Lesedi Masisi et Pragasen Pillay. « Design of Variable-Flux Permanent-Magnet Machines Using Alnico Magnets ». IEEE Transactions on Industry Applications 51, no 6 (novembre 2015) : 4482–91. http://dx.doi.org/10.1109/tia.2015.2461621.

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Fernandez, Daniel, Maria Martinez, David Reigosa, Juan M. Guerrero, Carlos Manuel Suarez Alvarez et Fernando Briz. « Permanent Magnets Aging in Variable Flux Permanent Magnet Synchronous Machines ». IEEE Transactions on Industry Applications 56, no 3 (mai 2020) : 2462–71. http://dx.doi.org/10.1109/tia.2020.2968872.

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Shen, Yiming, et Qinfen Lu. « Investigation of Novel Multi-Tooth Linear Variable Flux Reluctance Machines ». IEEE Transactions on Magnetics 54, no 11 (novembre 2018) : 1–5. http://dx.doi.org/10.1109/tmag.2018.2839662.

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Yang, Hui, Heyun Lin, Erxing Zhuang, Shuhua Fang et Yunkai Huang. « Investigation of design methodology for non‐rare‐earth variable‐flux switched‐flux memory machines ». IET Electric Power Applications 10, no 8 (septembre 2016) : 744–56. http://dx.doi.org/10.1049/iet-epa.2015.0427.

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12

Hanene, Hleli, Flah Aymen et Tounsi Souhir. « Variable reluctance synchronous machines in saturated mode ». International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no 2 (1 juin 2021) : 662. http://dx.doi.org/10.11591/ijpeds.v12.i2.pp662-673.

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Electric vehicle seems largely based on electrical machines. Finding the best motor type seems be important for having more performances and a transport system robustness. In this work, we present an analytical model of the synchronous machine with variable reluctances in linear and saturated modes. The angular position of the rotor (θ) and the phase current (i) will beused as parameters. The analytical model of this machine will allow us to determinate its magnetic characteristics such inductors, magnetic flux and electromagnetic torque. The results obtained by the analytical model are compared with those obtained by the finite element method. So, basing on Matlab/Simulink tool and by working with finite element method, these results are depicted and the paper objective is illustrated.
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13

Mörée, Gustav, et Mats Leijon. « Overview of Hybrid Excitation in Electrical Machines ». Energies 15, no 19 (2 octobre 2022) : 7254. http://dx.doi.org/10.3390/en15197254.

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Hybrid excitation is a technology that combines the advantages of field windings and permanent magnets for inducing magnetic flux. This article studies the benefits of hybrid excitation and provides an outlook on their possible applications, such as wind power generators and electric vehicle motors. Compared to permanent magnet-based machines, hybrid excitation gives a variable flux while still using the advantage of the permanent magnets for a portion of the flux. This article also looks into some different categories of machines developed for hybrid excitation. The categories are based on the reluctance circuit, the relative geometrical location of the field windings relative to the permanent magnets, or the placement of the excitation system.
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14

Hwang, Young Jin, Jae Young Jang et SangGap Lee. « A Flux-Controllable NI HTS Flux-Switching Machine for Electric Vehicle Applications ». Applied Sciences 10, no 5 (25 février 2020) : 1564. http://dx.doi.org/10.3390/app10051564.

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This paper deals with a flux-controllable NI HTS flux-switching machine (FSM) for electric vehicle (EV) applications. In a variable-speed rotating machine for EVs, such as electric buses, electric aircraft and electric ships, an electric motor capable of regulating the flux offers the advantage of constant output operation. In general, conventional HTS rotating machines have excellent flux-regulation performance, because they excite an HTS field coil. However, it is difficult to ensure any flux-regulation capabilities in HTS rotating machines using HTS field coils that apply the no-insulation (NI) winding technique, due to the inherent charge and discharge delays in these machines. Nevertheless, the NI winding technique is being actively researched as a key technology for the successful development of HTS rotating machines, because it can dramatically improve the operational stability of HTS field coils. Therefore, research to implement an HTS rotating machine with flux-regulation capabilities, while improving the operating stability of the HTS field coil using the NI winding technique, is required for EV applications. In this paper, we propose an HTS rotating machine with a flux switching structure, a type of topology of a rotating machine that is being actively studied for application to the electric motors used in EVs. The proposed HTS flux-switching machine (FSM) uses NI field coils, but additional field windings are applied for flux regulation, which enables flux control. In this study, an NI HTS field coil was also fabricated and tested because the characteristic resistance value should be used for the design and characteristic analyses of machines which utilize an NI coil. The simulation model used to analyze the flux-regulation performance capabilities of the NI HTS FSM were devised based on the characteristic resistance values obtained from a charging test of the fabricated NI HTS field coil. This study can provide a good reference for further research, including work on the manufacturing of a prototype NI HTS FSM for EV applications, and it can be used as a reference for the development of other HTS rotating machines, such as those used in large-scale wind power generation, where flux-regulation capabilities are required.
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15

Ballestín-Bernad, Víctor, Jesús Sergio Artal-Sevil et José Antonio Domínguez-Navarro. « A Review of Transverse Flux Machines Topologies and Design ». Energies 14, no 21 (1 novembre 2021) : 7173. http://dx.doi.org/10.3390/en14217173.

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High torque and power density are unique merits of transverse flux machines (TFMs). TFMs are particularly suitable for use in direct-drive systems, that is, those power systems with no gearbox between the electric machine and the prime mover or load. Variable speed wind turbines and in-wheel traction seem to be great-potential applications for TFMs. Nevertheless, the cogging torque, efficiency, power factor and manufacturing of TFMs should still be improved. In this paper, a comprehensive review of TFMs topologies and design is made, dealing with TFM applications, topologies, operation, design and modeling.
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16

Prajzendanc, Pawel, et Piotr Paplicki. « Performance Evaluation of an Axial Flux Machine with a Hybrid Excitation Design ». Energies 15, no 8 (8 avril 2022) : 2733. http://dx.doi.org/10.3390/en15082733.

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Variable speed, permanent magnet synchronous machines with hybrid excitation have attracted much attention due to their flux-control potential. In this paper, a design of permanent magnet axial flux machines with iron poles in the rotor and an additional electrically controlled source of excitation fixed on the stator is presented. This paper shows results pertaining to air-gap flux control, electromagnetic losses, electromagnetic torque, back emf and efficiency maps obtained through field-strengthening and weakening operations and investigated by 3D finite element analysis. Moreover, the temperature distribution of the machine was analyzed according to the fluid–thermal coupling method. The presented machine was prototyped and experimentally tested to validate the effectiveness of numerical models and achieved results.
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17

Zhong, Yuxiang, Heyun Lin, Zhiyong Chen, Shukang Lyu et Hui Yang. « Online-Parameter-Estimation-Based Control Strategy Combining MTPA and Flux-Weakening for Variable Flux Memory Machines ». IEEE Transactions on Power Electronics 37, no 4 (avril 2022) : 4080–90. http://dx.doi.org/10.1109/tpel.2021.3126581.

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18

Zhu, Z. Q., Hao Hua, Adam Pride, Rajesh Deodhar et Toshinori Sasaki. « Analysis and Reduction of Unipolar Leakage Flux in Series Hybrid Permanent-Magnet Variable Flux Memory Machines ». IEEE Transactions on Magnetics 53, no 11 (novembre 2017) : 1–4. http://dx.doi.org/10.1109/tmag.2017.2706764.

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19

Yang, Hui, Heyun Lin et Z. Q. Zhu. « Recent advances in variable flux memory machines for traction applications : A review ». CES Transactions on Electrical Machines and Systems 2, no 1 (mars 2018) : 34–50. http://dx.doi.org/10.23919/tems.2018.8326450.

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20

Liu, X., et Z. Q. Zhu. « Stator/Rotor Pole Combinations and Winding Configurations of Variable Flux Reluctance Machines ». IEEE Transactions on Industry Applications 50, no 6 (novembre 2014) : 3675–84. http://dx.doi.org/10.1109/tia.2014.2315505.

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21

Huang, L. R., J. H. Feng, S. Y. Guo, Y. F. Li, J. X. Shi et Z. Q. Zhu. « Rotor Shaping Method for Torque Ripple Mitigation in Variable Flux Reluctance Machines ». IEEE Transactions on Energy Conversion 33, no 3 (septembre 2018) : 1579–89. http://dx.doi.org/10.1109/tec.2018.2829493.

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22

Song, Zhanfeng, Siyu Hu et Zhongqiang Bao. « Variable Action Period Predictive Flux Control Strategy for Permanent Magnet Synchronous Machines ». IEEE Transactions on Power Electronics 35, no 6 (juin 2020) : 6185–97. http://dx.doi.org/10.1109/tpel.2019.2953941.

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23

Ullah, Noman, Abdul Basit, Faisal Khan, Wasiq Ullah, Mohsin Shahzad et Atif Zahid. « Enhancing Capabilities of Double Sided Linear Flux Switching Permanent Magnet Machines ». Energies 11, no 10 (16 octobre 2018) : 2781. http://dx.doi.org/10.3390/en11102781.

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Double sided linear flux switching permanent magnet machines (DSLFSPMMs) exhibit high thrust force density, high efficiency, low cost and robust double salient secondary (stator) structures. The aforementioned unique features make DSLFSPMM suitable for long stroke applications. However, distorted flux linkage waveforms and high detent forces can exaggerate thrust force ripples and reduce their applicability in many areas. In order to enhance thrust force performance, reduce thrust force ripple ratio and total harmonic distortion (THD) of no-load flux linkages, two structure-based advancements are introduced in this work, i.e., asynchronous mover slot and stator tooth displacement technique (AMSSTDT) and the addition of an active permanent magnet end slot (APMES). Furthermore, single variable geometric optimization (SVGO) is carried out by the finite element method (FEM).
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24

Mohamad Nordin, Norjulia, Naziha Ahmad Azli, Nik Rumzi Nik Idris, Nur Huda Ramlan et Tole Sutikno. « Constant Frequency Torque Controller for DTC with Multilevel Inverter of Induction Machines ». International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no 1 (1 mars 2016) : 28. http://dx.doi.org/10.11591/ijpeds.v7.i1.pp28-44.

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Direct Torque Control using multilevel inverter (DTC-MLI) with hysteresis controller suffers from high torque and flux ripple and variable switching frequency. In this paper, a constant frequency torque controller is proposed to enhance the DTC-MLI performance. The operational concepts of the constant switching frequency torque controller of a DTC-MLI system followed by the simulation results and analysis are presented. The proposed system significantly improves the DTC drive in terms of dynamic performance, smaller torque and flux ripple, and retain a constant switching frequency.
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Cui, Yingjie, Munawar Faizan et Zhongxian Chen. « Back EMF Waveform Comparison and Analysis of Two Kinds of Electrical Machines ». World Electric Vehicle Journal 12, no 3 (8 septembre 2021) : 149. http://dx.doi.org/10.3390/wevj12030149.

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In this study, the back electromotive force (EMF) waveforms of a flux switching permanent magnet (FSPM) machine and variable flux memory permanent magnet (VFMPM) machine with same main dimension were researched. Firstly, the simulation result showed that the maximum amplitude of phase back EMF waveform of FSPM machine was 245% larger than that of the VFMPM machine, and this was verified by the experimental result (243%). Secondly, the phase back EMF harmonics of the FSPM machine and VFMPM machine were compared, including the enhance flux condition and weaken flux condition of VFMPM machine. At last, the mutual demagnetization effect, which led to the difference amplitudes of maximum back EMF waveform between FSPM machine and VFMPM machine was analyzed. The comparison and analysis of the back EMF waveform will provide some qualitative advice for the future application research of the FSPM machine and VFMPM machine, such as application selection, optimization control method and so on.
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26

Le, Phuong Minh, Phong Hoai Nguyen et Hung Ngoc Dang. « Adaptive-Loss minimization control for speed sensorless induction machines ». Science and Technology Development Journal 17, no 2 (30 juin 2014) : 33–44. http://dx.doi.org/10.32508/stdj.v17i2.1356.

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This paper presents a new online loss-minimization algorithm in the adaptive control model for speed sensorless based on the Direct Rotor Flux Oriented Control (DRFOC) with optimum flux in the condition of do variable stator resistance. The paper also presents a new approach to develop a reference and adaptive models to estimate the speed and to observe stator resistance change. Simulation results in Matlab Simulink showed good adaptability of the presented model controls even when the stator resistance changes to up 200% of rated. In addition, using the proposed algorithm allows reducing losses and improving efficiency of proposed control model in comparison with DRFOC traditional model for load range 0-70% of the rated. Where the difference of efficient can reach 42%, and the difference in loss to 85%.
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Xie, Ying, Zhaoyang Ning et Zexin Ma. « Comparative Study on Variable Flux Memory Machines With Different Arrangements of Permanent Magnets ». IEEE Access 8 (2020) : 164304–12. http://dx.doi.org/10.1109/access.2020.3022595.

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28

Yang, Hui, Z. Q. Zhu, Heyun Lin, Shuhua Fang et Yunkai Huang. « Comparative Study of Novel Variable-Flux Memory Machines Having Stator Permanent Magnet Topologies ». IEEE Transactions on Magnetics 51, no 11 (novembre 2015) : 1–4. http://dx.doi.org/10.1109/tmag.2015.2451642.

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Hua, Hao, Z. Q. Zhu, Adam Pride, Rajesh Deodhar et Toshinori Sasaki. « Comparative Study on Variable Flux Memory Machines With Parallel or Series Hybrid Magnets ». IEEE Transactions on Industry Applications 55, no 2 (mars 2019) : 1408–19. http://dx.doi.org/10.1109/tia.2018.2879858.

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30

Liu, Faliang, Luming Cheng, Mingqiao Wang, Guangyuan Qiao, Ping Zheng et Hui Yang. « Comparative study of hybrid-PM variable-flux machines with different series PM configurations ». AIP Advances 9, no 12 (1 décembre 2019) : 125241. http://dx.doi.org/10.1063/1.5129828.

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31

Huang, Liren, Jianghua Feng, Shuying Guo, Junxu Shi et Zi Qiang Zhu. « Analysis of power factor in variable flux reluctance machines with MMF‐permeance model ». IET Electric Power Applications 13, no 5 (24 janvier 2019) : 614–24. http://dx.doi.org/10.1049/iet-epa.2018.5301.

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Huang, Yunrui, Hui Yang, Hao Zheng, Heyun Lin et Z. Q. Zhu. « Analysis of flux barrier effect of LCF PM in series hybrid magnet variable flux memory machine ». AIP Advances 13, no 2 (1 février 2023) : 025230. http://dx.doi.org/10.1063/9.0000611.

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Variable flux memory machines (VFMMs) with series hybrid magnets using both low coercive force (LCF) and high coercive force (HCF) permanent magnets (PMs) have been recognized as a viable candidate for wide-speed-range industrial applications due to the advantages of high torque density and wide speed range. Nevertheless, the adverse effects of LCF PM on the HCF PM in series-type VFMM under different magnetization states (MSs) are still unreported. In this paper, the flux barrier effect (FBE) of the LCF PM existing in series hybrid magnet VFMM is first revealed, and its causes are discussed as well as analyzed in depth on the basis of the equivalent magnetic circuit method and finite-element (FE) analyses. A topology of VFMM with dual-layer PMs is further developed to alleviate the FBE induced from LCF PMs. It can be found that the FBE can be effectively suppressed by employing the dual-layer (DL) PM arrangement and additional leakage flux paths. A prototype of the proposed design is built, and the theoretical and FE results are experimentally verified.
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Qasim, Muhammad, Faisal Khan, Basharat Ullah, Himayat Ullah Jan et Hend I. Alkhammash. « Analysis of Linear Hybrid Excited Flux Switching Machines with Low-Cost Ferrite Magnets ». Energies 15, no 4 (13 février 2022) : 1346. http://dx.doi.org/10.3390/en15041346.

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Linear hybrid excited flux switching machines (LHEFSM) combine the features of permanent magnet flux switching machines (PMFSM) and field excited flux switching machines (FEFSM). Because of the widespread usage of rare-earth PM materials, their costs are steadily rising. This study proposes an LHEFSM, a dual stator LHEFSM (DSLHEFSM), and a dual mover LHEFSM (DMLHEFSM) to solve this issue. The employment of ferrite magnets rather than rare-earth PM in these suggested designs is significant. Compared to traditional designs, the proposed designs feature greater thrust force, power density, reduced normal force, and a 25% decrease in PM volume. A yokeless primary structure was used in a DSLHEFSM to minimize the volume of the mover, increasing the thrust force density. In DMLHELFSM, on the other hand, a yokeless secondary structure was used to lower the secondary volume and the machine’s total cost. Single variable optimization was used to optimize all of the proposed designs. By completing a 3D study, the electromagnetic performances acquired from the 2D analysis were confirmed. Compared to conventional designs, the average thrust force in LHEFSM, DSLHEFSM, and DMLHEFSM was enhanced by 15%, 16.8%, and 15.6%, respectively. Overall, the presented machines had a high thrust force density, a high-power density, a high no-load electromotive force, and a low normal force, allowing them to be used in long-stroke applications.
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Gu, Xiangpei, Nicola Bianchi et Zhuoran Zhang. « Analysis and Preliminary Design of Variable Flux Reluctance Machines : A Perspective from Working Field Harmonics ». Vehicles 6, no 1 (21 mars 2024) : 571–89. http://dx.doi.org/10.3390/vehicles6010026.

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Variable flux reluctance machines (VFRMs) are increasingly attracting research interest due to their magnetless and robust brushless structure. Under the modulation effect of the airgap permeance, the VFRM operates with a series of field harmonics, distinguishing it from conventional AC synchronous machines. This paper deals with the analysis and preliminary design of the VFRM from the perspective of multiple working airgap field harmonics. Firstly, the spatial and temporal order of the working field harmonics are defined. The systematic winding theory, including the unified star of slots and winding factor calculation method, is established to consider all these working harmonics. Then, an average torque model is built and simplified. The key role of 1st-order rotor permeance, 1st- and 3rd-order polarized stator permeance is deduced. The relationship between key parameters and average torque is computed, providing a guideline for the preliminary design of the VFRM.
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Yu, Mingjie, Wenliang Zhao, Cong Liu, Xiuhe Wang et Byung-il Kwon. « Design and analysis of a novel variable flux spoke-type motor for washing machines ». International Journal of Applied Electromagnetics and Mechanics 64, no 1-4 (10 décembre 2020) : 91–101. http://dx.doi.org/10.3233/jae-209311.

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This paper deals with the design and analysis of a novel variable flux spoke-type motor (VFSM) for washing machines by focally considering the performance at the laundry and spin-drying operating modes. The key design goal is to obtain the high efficiency for the two operating modes. At the laundry mode, the ferrite and AlNiCo magnets are utilized together as the excitations to obtain a high magnetic loading, thus to obtain high torque and efficiency. At the spin-drying mode, the AlNiCo magnets are demagnetized by a pulse negative d-axis current to reduce magnetic flux density, thus to obtain low iron loss and high efficiency. The outer rotor structure with the spoke-type magnet configuration is utilized to enhance the high output performances. The D2L method is utilized to design the key parameters of the VFSM. To demonstrate the superiority of the designed VFSM, the electromagnetic characteristics are predicted by the finite element method (FEM). As a result, the volume size of the proposed VFSM is decreased by 19.4%, and the efficiency at the low-speed laundry mode is increased by 25.4%, when compared to the referenced commercial washing machine motor.
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36

Liu, X., et Z. Q. Zhu. « Electromagnetic Performance of Novel Variable Flux Reluctance Machines With DC-Field Coil in Stator ». IEEE Transactions on Magnetics 49, no 6 (juin 2013) : 3020–28. http://dx.doi.org/10.1109/tmag.2012.2235182.

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Yang, Hui, Hao Zheng, Heyun Lin, Zi-Qiang Zhu, Weinong Fu, Wei Liu, Jiaxing Lei et Shukang Lyu. « Investigation of Hybrid-Magnet-Circuit Variable Flux Memory Machines With Different Hybrid Magnet Configurations ». IEEE Transactions on Industry Applications 57, no 1 (janvier 2021) : 340–51. http://dx.doi.org/10.1109/tia.2020.3033836.

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38

Ge, Meng, Jian Li, Ronghai Qu, Yang Lu et Junhua Chen. « A Synthetic Frozen Permeability Method for Torque Separation in Hybrid PM Variable-Flux Machines ». IEEE Transactions on Applied Superconductivity 28, no 3 (avril 2018) : 1–5. http://dx.doi.org/10.1109/tasc.2018.2793202.

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Lyu, Shukang, Hui Yang et Heyun Lin. « Magnetization State Selection Method for Uncontrolled Generator Fault Prevention on Variable Flux Memory Machines ». IEEE Transactions on Power Electronics 35, no 12 (décembre 2020) : 13270–80. http://dx.doi.org/10.1109/tpel.2020.2992250.

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40

Zhang, Quan Kun, Yu Yu, Shuai Mei Lian, Hong Hu et Yu Jian Zhang. « High-Order Terminal Sliding Mode Control for Brushless Doubly-Fed Machines ». Applied Mechanics and Materials 685 (octobre 2014) : 384–88. http://dx.doi.org/10.4028/www.scientific.net/amm.685.384.

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A novel sliding-mode variable structure(SMVS) control strategy is proposed to reduce the ripples of flux and torque of brushless double-fed machines(BDFM) based on direct torque control system. In order to ensure the constant switching frequency for the inverter, two hysteresis regulators in the conventional direct torque control system system are substituted by the SMVS controllers of flux and torque，nonsingular terminal sliding modes are designed to make the motor power reach the given values in a finite period of time. and the high-order sliding mode method is adopted to estimate the chattering phenomenon of the conventional sliding mode. Meanwhile, to obtain the parameters of High-order terminal sliding mode control, a method of fuzzy neural network is presented. The simulation results show that the nonsingular high-order terminal sliding-mode control can improve the robustness and dynamic response of the system.
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41

Aib, A., D. E. Khodja et S. Chakroune. « Field programmable gate array hardware in the loop validation of fuzzy direct torque control for induction machine drive ». Electrical Engineering & ; Electromechanics, no 3 (23 avril 2023) : 28–35. http://dx.doi.org/10.20998/2074-272x.2023.3.04.

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Introduction. Currently, the direct torque control is very popular in industry and is of great interest to scientists in the variable speed drive of asynchronous machines. This technique provides decoupling between torque control and flux without the need to use pulse width modulation or coordinate transformation. Nevertheless, this command presents two major importunities: the switching frequency is highly variable on the one hand, and on the other hand, the amplitude of the torque and stator flux ripples remain poorly controlled throughout the considered operating speed range. The novelty of this article proposes improvements in performance of direct torque control of asynchronous machines by development of a fuzzy direct torque control algorithm. This latter makes it possible to provide solutions to the major problems of this control technique, namely: torque ripples, flux ripples, and failure to control switching frequency. Purpose. The emergence of this method has given rise to various works whose objective is to show its performance, or to provide solutions to its limitations. Indeed, this work consists in validation of a fuzzy direct torque control architecture implemented on the ML402 development kit (based on the Xilinx Virtex-4 type field programmable gate array circuit), through hardware description language (VHDL) and Xilinx generator system. The obtained results showed the robustness of the control and sensorless in front of load and parameters variation of induction motor control. The research directions of the model were determined for the subsequent implementation of results with simulation samples.
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42

Younsi, Mohamed Omar, Olivier Ninet, Fabrice Morganti, Jean-Philippe Lecointe, Farid Zidat et Matthieu Buire. « Impact of supply voltage variations on external magnetic field emitted by induction machines ». COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no 3 (2 mai 2017) : 692–701. http://dx.doi.org/10.1108/compel-09-2016-0423.

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Purpose This paper aims to study the influence of supply voltage variations on the external magnetic field emitted by grid-powered induction machines (IMs). Design/methodology/approach Two models are developed in the paper to analyse, for different supply voltage values, the influence of the variations of the magnetizing voltage for which there is a link with the tangential component of the external flux. The first is an analytical model based on the IM single-phase-equivalent circuit with variable magnetizing reactance to take into account the saturation of the magnetic circuit. The second is a numerical finite element simulation to model the same phenomenon. Results of both models are analysed with experimental measures of the external flux. Findings The study shows that the amplitude of the external field strongly depends on supply voltage values. Research limitations/implications The investigation is mainly focused on the tangential component of the external magnetic field which is of high importance concerning the applicability of non-invasive methods of diagnosis, as electromagnetic torque estimation developed by the authors or internal fault determination. Originality/value The originality of the paper concerns the characterization of the external flux with the supply voltage for IMs. It is shown that the magnetic circuit radiates external flux differently with the load and with the supply voltage.
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43

Xu, Wei, et Wen Wu Yang. « Improved Model Based Predictive Torque Control Strategy with Fast Dynamic Response for Flux-Switching Permanent Magnet Machines ». Applied Mechanics and Materials 416-417 (septembre 2013) : 704–10. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.704.

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The flux-switching permanent magnet machine (FSPMM) has got great attention by academic researchers during the past couple of years for its merits of strong mechanical robustness, high efficiency, strong thermal dissipation ability, etc. However, for its inherited double salient structure in both stator and rotor, the FSPMM suffers from severe torque and flux ripples at different rotor positions for its variable magnetic resistance, which cannot be solved completely only by electromagnetic optimal design. In order to increase the drive performance of FSPMM, such as dynamic response and stable torque smoothness, an improved model based predictive torque control (MPTC) algorithm is proposed. By using the cost function modulation strategy, the torque and flux ripples of FSPMM are reduced evidently, accompanying with the minimized converter switching frequency and power loss. Comprehensive simulation investigations are finally carried out to validate relevant theoretical analysis.
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Shi, J. T., X. Liu, D. Wu et Z. Q. Zhu. « Influence of Stator and Rotor Pole Arcs on Electromagnetic Torque of Variable Flux Reluctance Machines ». IEEE Transactions on Magnetics 50, no 11 (novembre 2014) : 1–4. http://dx.doi.org/10.1109/tmag.2014.2330363.

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Huang, Liren, Z. Q. Zhu, Jianghua Feng, Shuying Guo, J. X. Shi et Wenqiang Chu. « Analysis of Stator/Rotor Pole Combinations in Variable Flux Reluctance Machines Using Magnetic Gearing Effect ». IEEE Transactions on Industry Applications 55, no 2 (mars 2019) : 1495–504. http://dx.doi.org/10.1109/tia.2018.2883608.

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Huang, Liren, Z. Q. Zhu, Jianghua Feng, Shuying Guo et J. X. Shi. « Comparative Analysis of Variable Flux Reluctance Machines With Double- and Single-Layer Concentrated Armature Windings ». IEEE Transactions on Industry Applications 55, no 2 (mars 2019) : 1505–15. http://dx.doi.org/10.1109/tia.2018.2884608.

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Hua, Hao, Z. Q. Zhu, Adam Pride, Rajesh P. Deodhar et Toshinori Sasaki. « Comparison of End Effect in Series and Parallel Hybrid Permanent-Magnet Variable-Flux Memory Machines ». IEEE Transactions on Industry Applications 55, no 3 (mai 2019) : 2529–37. http://dx.doi.org/10.1109/tia.2018.2889979.

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Chatterjee, Debashis. « A Simple Leakage Inductance Identification Technique for Three-Phase Induction Machines Under Variable Flux Condition ». IEEE Transactions on Industrial Electronics 59, no 11 (novembre 2012) : 4041–48. http://dx.doi.org/10.1109/tie.2011.2176694.

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49

Ullah, Wasiq, Faisal Khan et Erwan Sulaiman. « Sub-domain modelling and multi-variable optimisation of partitioned PM consequent pole flux switching machines ». IET Electric Power Applications 14, no 8 (1 août 2020) : 1360–69. http://dx.doi.org/10.1049/iet-epa.2019.0993.

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50

Murgoci, Dragoș, et Maricel Adam. « The Synchronous Electric Machine with Variable Geometry Done by Elastic Permanent Magnets ». Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section 68, no 4 (1 décembre 2022) : 91–114. http://dx.doi.org/10.2478/bipie-2022-0024.

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Abstract The paper refers to an electric machine (motor/generator) with an adjustable magnetic field, because its rotor has a special construction that allows the deformation of its elastic permanent magnets. The permanent magnets deform due to a clamping stroke parameter and in this way the flux density of the magnetic field as well as the width and length of the permanent magnets are variable. The variable magnetic field crosses the stator coils which are supplied by the voltages and due to a variable magnetic flux density, a higher torque will result even at lower values of the currents. As a result, a higher efficiency will be obtained due to the increase in mechanical power and the decrease in losses (e.g., Joule effect) in the stator windings. The presented electric machine is a synchronous machine with variable geometry, belonging to the category of permanent magnet machines. Specific to this machine is the fact that the rotor magnets are elastic, being made of ferritic compound rubber with neodimium magnets N45.
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