IEEE Transactions on Magnetics

Journal Information
ISSN / EISSN : 0018-9464 / 1941-0069
Published by: IEEE (10.1109)
Total articles ≅ 34,871
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Minxia Shi, Aici Qiu, Junhao Li
IEEE Transactions on Magnetics, pp 1-1; doi:10.1109/tmag.2021.3101052

In this study, we explore the vector magnetic properties of the electrical steel sheet under DC-biased flux and rotating magnetic field of different frequency. The corresponding iron loss and the rotational eddy current loss are discussed. An enhanced vector magnetic hysteresis model is proposed to describe B-H behavior under these conditions. The accuracy of the proposed model is verified by the close agreement between hysteresis loops calculated with the proposed model and those measured experimentally, as well as by the neglectable calculation error of the total iron loss.
Junru Li, Chunrui Peng, Si Chen, Yang Gao, , Xuefeng He
IEEE Transactions on Magnetics, pp 1-1; doi:10.1109/tmag.2021.3099286

The conductive magnetic film will produce eddy current loss when it works in a high-frequency band, which will reduce the performance of bulk acoustic wave magnetoelectric (BAW ME) devices. If the eddy current loss is not taken into account in the devices modeling, the models will be seriously distorted. Therefore, combining the Maxwell’s equations with constitutive relations of ME material, we define the eddy current loss Angle as a figure of merit to evaluate the eddy current loss. Then the models of eddy current loss rate of the potential energy and average radiated power are constructed respectively. The finite element analysis is used to further validate the analytic model. In addition, the effect of isolation layers on eddy current suppression is studied by using the analytical model. The results show that the analytical solutions match with the numerical simulation results perfectly.
Quan Gan, Youtong Fang,
IEEE Transactions on Magnetics, pp 1-1; doi:10.1109/tmag.2021.3100058

The demand for low-speed and high-torque electrical machines is increasing in different applications. Previous research showed that dual-stator magnetically geared machines, such as Vernier pseudo-direct-drive machines (VPDD) can have a high torque density as well as a high power factor. However, the size of their end-winding can affect heavily their torque density. Based on a distributed winding VPDD, we propose a concentrated-winding split-teeth VPDD (ST-VPDD), which can reduce the size of end-winding and output higher torque density. In this research, a model of the end-winding volume is given. Through preliminary design and finite element model FEM analysis, the torque density optimization has been performed to maximize the torque density. Taking the end-winding into account, there is a 93.8% improvement for the torque density, compared to the VPDD, to reach 78.1 Nm/L. After adding a sleeve for mechanical stability, the ST-VPDD still gives a 68.7% improvement compared to the VPDD.
, Lidia A. Chekanova, Sergey V. Komogortsev, Mihail V. Rautsky, Ivan V. Nemtsev, Rauf S. Iskhakov, Vladimir S. Plotnikov, Vladimir V. Tkachev, Oksana A. Li, Margarita V. Dolgopolova
IEEE Transactions on Magnetics, pp 1-1; doi:10.1109/tmag.2021.3098747

A porous polymer loaded with segmented nanorods of magnetic metal is very promising for the design of novel microwave devices. Arrays of bi-segmented Ni/Co and core-shell [email protected] rods were prepared by electroless deposition into porous of polycarbonate track etched membrane. An intrinsic effective magnetic field of the magnetic composite nanorods aligned in the nonmagnetic template was studied by magnetization curves and ferromagnetic resonance. The effect of the interface boundaries for two types of bi-segmented rods with coaxial and along-axis Co/Ni segmentation to effective field was established.
IEEE Transactions on Magnetics, Volume 57; doi:10.1109/tmag.2021.3096021

Presents the front cover for this issue of the publication.
IEEE Transactions on Magnetics, Volume 57; doi:10.1109/tmag.2021.3096022

Presents a listing of the editorial board, board of governors, current staff, committee members, and/or society editors for this issue of the publication.
Mousalreza Faramarzi Palangar, Wen L. Soong, Nicola Bianchi, Rong-Jie Wang
IEEE Transactions on Magnetics, pp 1-1; doi:10.1109/tmag.2021.3098392

This paper covers the design methodologies and optimisation techniques studied in the performance improvement of line-start permanent magnet synchronous motors (LSPMSM). LSPMSM performance improvement using design techniques are chiefly limited to either the transient or the steady-state performance improvement, and a focus on only the transient performance improvement may degrade the steady-state performance of the LSPMSM and vice versa. Optimisation studies of LSPMSMs can be categorized in terms of optimisation aim in three classifications: transient performance improvement, steady-state performance improvement, and simultaneous improvement of both transient and the steady-state performance. This study indicates the impact of various variables on the LSPMSM performance improvement. The optimisation review shows that starting cage optimisation without considering the steady-state characteristics as constraints results in synchronous performance degradation. The steady-state performance optimization with transient characteristics as constraints results in a minor synchronous performance improvement though there is the lowest transient performance sacrifice. Multi-objective optimization including a transient and a steady-state characteristic as individual objectives resulted in a more optimum LSPMSM with overall performance improvement. Finally, suggestions for optimisation implementation of LSPMSMs are presented for future research work.
J. Typek, K. Wardal, G. Zolnierkiewicz, , D. Sibera, U. Narkiewicz
IEEE Transactions on Magnetics, pp 1-1; doi:10.1109/tmag.2021.3095729

Three nanocrystalline samples of ZnO doped with MnO (with 20, 30, and 40 wt% of MnO in initial mixture) were synthesized by the wet chemical method. Previous X-ray diffraction study has found they contained only hexagonal ZnO and cubic ZnMnO3 nanocrystals. Dc magnetisation study revealed a paramagnetic state above 50 K, the presence of mixed valence of Mn ions (Mn3+ and Mn4+) and an important role played by magnetic clusters influencing the behaviour of the effective magnetic moment and effective interaction type. Low temperature results indicated a chain of magnetic transformation from paramagnetic to ferrimagnetic, to superparamagnetic and to blocked states. Electron spin resonance (ESR) provided additional information about magnetic relaxation of the spin clusters and possible location of separate Mn2+ and Mn4+ ions. Large magnetic inhomogeneity of our samples was evidenced and it is the result of magnetic ions clustering, various valences of Mn ions, distribution of nanoparticle sizes and competition of magnetic interactions.
Liu Yang, , Wenqin Mo, Junlei Song, Kaifeng Dong, Yajuan Hui, Hai Wang, Yan Wei, Jiefeng Jiang, Yuanqiu Liu
IEEE Transactions on Magnetics, pp 1-1; doi:10.1109/tmag.2021.3095543

Magnetic skyrmions have the potential for a wide range of applications in the next generation of spintronics since they are topologically protected spin configurations in the nanometer length scale. In order to be used in the logic gate, it is necessary to consider how to manipulate magnetic skyrmions. At present, the current drive is the mainstream drive, but this method could consume enormous energy for large Joule heating. In this work, the potential well is introduced to drive skyrmion to reduce energy consumption. The potential well is generated by voltage-controlled magnetic anisotropy (VCMA). We study the possibility of the potential well induced skyrmion movement within a certain distance, the relevant factors that affect the distance of skyrmion induction and propose a switched-voltage driving structure within the well-established framework of micromagnetics. Its processes have been theoretically investigated and demonstrated, in which the switched-voltage driving structure can be used to drive skyrmions. Our results provide guidance for the design of low energy consumption voltage-driven skyrmion driving method and a new concept for track memory.
Zixian Li, ShuangXi Li, Xin Wang, Decai Li
IEEE Transactions on Magnetics, pp 1-1; doi:10.1109/tmag.2021.3094868

Magnetorheological fluid seal and brush seal are both successful sealing forms. To address problems such as pole pieces colliding with spindles, precise sealing clearance in magnetic fluid seals and inevitable leakage in brush seals, this paper combines advantages of magnetic fluid seal and brush seal and proposed a magnetorheological fluid seal with flexible pole pieces. The magnetic field of the seal was estimated using the finite-element method and the seal capacity was studied in theory. Single structural parameters of the seal that affect sealing capacity, such as the relative permeability and thickness were discussed. The combined effects of various structural parameters were analyzed. The results show that increase in the relative permeability and length of flexible pole pieces leads to the enhancement of the seal capacity; The thickness of the flexible magnetic pole piece, the magnetic part of the flap and coating are inversely proportional to the sealing pressure value. The experimentally obtained seal capacity agrees with the value calculated through the simulation. This paper presents a structure of magnetorheological fluid seal and comparative results of the seal capacity obtained from both experimental studies and numerical simulation calculations.
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