IEEE Transactions on Magnetics最新文献_第10页

Optimized Design of Sub-Harmonic Synchronous Machines 次谐波同步电机的优化设计

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-04-08 DOI: 10.1109/TMAG.2025.3558456

S. M. Sajjad Hossain Rafin;Qasim Ali;Hossam Hussein;Osama A. Mohammed

{"title":"Optimized Design of Sub-Harmonic Synchronous Machines","authors":"S. M. Sajjad Hossain Rafin;Qasim Ali;Hossam Hussein;Osama A. Mohammed","doi":"10.1109/TMAG.2025.3558456","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3558456","url":null,"abstract":"This article presents an optimized design approach for sub-harmonic synchronous machines (SHSMs) to minimize torque ripple and improve performance for high-power electric vehicle applications. The proposed design incorporates a novel rotor harmonic winding configuration and utilizes advanced skewing techniques to achieve optimal spatial distribution of magnetic forces. Using Ansys Maxwell software, finite element analysis (FEA) was conducted on eight-pole, 48-slot SHSMs with a rated output of 1.3 kW and 900 r/min. Compared to earlier designs, the optimized two-layer and three-layer SHSMs demonstrated significant reductions in torque ripple—83.94% and 86.84%, respectively. This improvement is attributed to the uniform distribution of harmonic windings and carefully calibrated rotor skewing, both of which enhance spatial efficiency and magnetic field uniformity across the rotor. These configurations achieve lower torque ripple and maintain high efficiency and competitive average torque output, making them suitable alternatives to conventional wound rotor synchronous machines (WRSMs) and permanent magnet synchronous machines (PMSMs). The findings validate the potential of the optimized SHSMs as high-performance, brushless solutions for electric vehicle propulsion, contributing to advancements in synchronous machine design and sustainable transportation technologies.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 9","pages":"1-5"},"PeriodicalIF":1.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A 1-DOF Controlled Full Levitation Hybrid Magnetic Bearing for Compact Centrifugal Kidney Pumps 一种用于紧凑离心肾泵的1自由度控制全悬浮混合磁轴承

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-04-07 DOI: 10.1109/TMAG.2025.3558664

Chengcheng Xu;Feng Sun;Xiaoyou Zhang;Junjie Jin;Fangchao Xu;Chuan Zhao;Wenxuan Lu;Yanfeng Wang;Zhenhua Ji;Hua Zheng

{"title":"A 1-DOF Controlled Full Levitation Hybrid Magnetic Bearing for Compact Centrifugal Kidney Pumps","authors":"Chengcheng Xu;Feng Sun;Xiaoyou Zhang;Junjie Jin;Fangchao Xu;Chuan Zhao;Wenxuan Lu;Yanfeng Wang;Zhenhua Ji;Hua Zheng","doi":"10.1109/TMAG.2025.3558664","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3558664","url":null,"abstract":"In magnetic levitation centrifugal blood pumps, most magnetic bearings have flat rotors, so this kind of magnetic bearings is not suitable for the rotor structure of centrifugal kidney pumps with similar axial-radial dimensions. This article combines permanent magnets (PMs) passive levitation and electromagnetic active levitation to propose a hybrid magnetic levitation bearing structure for centrifugal kidney pumps. The magnetic bearing has the characteristics of small size, low power consumption, and compact structure. It realizes the five-degree-of-freedom (5-DOF) stable levitation of the rotor by actively controlling the axial single degree of freedom (1-DOF), aiming to replace the traditional rolling bearings in centrifugal kidney pumps. First, the structure and working principle of the magnetic bearing are demonstrated. Second, the magnetic force properties of magnetic bearings were simulated and analyzed by the finite element analysis method, and the magnetic bearing magnetic force model was derived based on the equivalent magnetic charge theory and magnetic circuit calculation theory. Finally, the magnetic bearing differential control system based on a pole assignment controller was designed, the magnetic bearing prototype was trial-made, and its levitation performance was evaluated through simulation and experiment. Simulation and experimental results show that the magnetic bearing system has good levitation characteristics and low power consumption characteristics.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 6","pages":"1-14"},"PeriodicalIF":2.1,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analytical and Experimental Approaches to Predicting Magnetic Field Asymmetry and Electromagnetic Forces in Slotted Surface-Mounted Permanent Magnet Machines With Rotor Eccentricity 转子偏心开槽永磁电机磁场不对称性和电磁力预测的分析与实验方法

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-04-07 DOI: 10.1109/TMAG.2025.3558272

Yeon-Su Kim;Jun-Won Yang;Yong-Joo Kim;Kyung-Hun Shin;Jang-Young Choi

引用次数: 0

Improving Magnetic Immunity of STT-MRAM in Strong External Magnetic Field Environments Using Magnetic Shield 利用磁屏蔽提高STT-MRAM在强外磁场环境下的抗扰度

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-04-07 DOI: 10.1109/TMAG.2025.3558542

Abhishek Talapatra;Aritra Kundu;Clarissa Prawoto;Vinayak Bharat Naik;Alban Zaka

{"title":"Improving Magnetic Immunity of STT-MRAM in Strong External Magnetic Field Environments Using Magnetic Shield","authors":"Abhishek Talapatra;Aritra Kundu;Clarissa Prawoto;Vinayak Bharat Naik;Alban Zaka","doi":"10.1109/TMAG.2025.3558542","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3558542","url":null,"abstract":"Magnetic random access memory (MRAM) is proven to be the most eligible candidate to replace the flash technology. Low power consumption along with higher cycling endurance, faster speed, and stability over the entire automotive temperature range (−40 °C to 150 °C) are the key features of MRAM. However, magnetic immunity in the strong magnetic field environments is one of the concerns for the present spin-transfer-torque MRAM (STT-MRAM) technology where the magnetic energy barrier between the two bistable memory states decreases in the presence of an external magnetic field. While the exposure of the MRAM chip to the external magnetic field cannot be avoided completely, the magnitude of the field at the chip can be significantly reduced using a package-level magnetic shield. In this article, we have considered different external magnetic field environments created by permanent magnets of different dimensions and distances from the packaged MRAM chip. We have emphasized the importance of the design of the shield together with the choice of shield materials based on different ranges of external magnetic fields to be shielded. The reduction in the magnitude of the external magnetic field at the chip due to the introduction of shield improves the bit-error-rate (BER) significantly. We have also demonstrated that the position and dimensions of the field source are also important in determining the uniformity of the shielding effect throughout the chip by identifying the worst corner of the packaged chip against the external magnetic field.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 6","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-Bandwidth Current Shunt With Extremely Low Stray Magnetic Field Based on Thin-Film Resistors 基于薄膜电阻的超低杂散磁场高带宽电流分流

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-04-04 DOI: 10.1109/TMAG.2025.3557788

Jianzhi Xu;Lifang Yi;Woongkul Lee;Jinyeong Moon

{"title":"High-Bandwidth Current Shunt With Extremely Low Stray Magnetic Field Based on Thin-Film Resistors","authors":"Jianzhi Xu;Lifang Yi;Woongkul Lee;Jinyeong Moon","doi":"10.1109/TMAG.2025.3557788","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3557788","url":null,"abstract":"The use of wide bandgap (WBG) devices introduces higher frequency components into power electronics due to increased switching speeds. To achieve reliable measurement of these high-frequency components in power electronics, high-bandwidth voltage and current probes are essential. While 1 GHz bandwidth voltage probes are commercially available, current probes are typically limited to below 200 MHz. A resistive current sensor, often called a current shunt, converts magnetic field measurement into electric potential measurement, enabling us to use well-established gigahertz-level voltage probes. The overall structure must have an extremely low level of stray magnetic field to minimize parasitic inductance and hence to increase the measurement bandwidth. This article proposes a novel coaxial structure based on thin-film resistors for current shunts. ANSYS Q3D and high-frequency structure simulator (HFSS) simulations demonstrate that this structure effectively cancels magnetic fields along various axes, leading to nearly nonexistent stray fields outside the structure and significantly minimizing parasitic inductance. Experimental results from a prototype with a bandwidth of up to 2.063 GHz validate the proposed design.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 9","pages":"1-5"},"PeriodicalIF":1.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two-Step Equivalent Sources Method for Electromagnetic Near-Field Calculations at Microwave Frequencies 微波频率下电磁近场计算的两步等效源法

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-04-03 DOI: 10.1109/TMAG.2025.3556521

Christoph J. Salomon;Nikola Petrović;Bojana Petković

{"title":"Two-Step Equivalent Sources Method for Electromagnetic Near-Field Calculations at Microwave Frequencies","authors":"Christoph J. Salomon;Nikola Petrović;Bojana Petković","doi":"10.1109/TMAG.2025.3556521","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3556521","url":null,"abstract":"In this article, we propose a two-step equivalent sources method (ESM) to calculate the total electric and magnetic fields in the vicinity of a dielectric scatterer located in the near-field of a radiating Hertz dipole. The electric component is determined by calculating equivalent bounded surface charges at the boundary of the dielectric object, resulting in reduced linear system of equations (LSE) compared with other ESMs that require the whole volume to be discretized. Singularities in the electric field of the surface point charges are avoided by introducing uniformly charged triangular sheets. A second set of equivalent sources is derived to account for the magnetic field. While these fictitious magnetic field sources are distributed over the whole volume of the object, no further matrix inversion is required as will be presented herein. Even with a relatively coarse discretization of 284 surface and 552 volume elements, an error of less than 0.2% with respect to a reference solution obtained from a finite element method (FEM) is achieved. The small error together with the significantly reduced computation time demonstrate the high accuracy and efficiency of the proposed method.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 6","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10948456","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144171048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling Non-Linear and Non-Stationary Magnetic Signals: An Enhanced Signal Processing Strategy for Wind Time Series Analysis 非线性非平稳磁信号建模：一种用于风时间序列分析的增强信号处理策略

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-04-02 DOI: 10.1109/TMAG.2025.3557261

Akhyurna Swain;Imraan Hossain;Chunhua Liu;Philip W. T. Pong

{"title":"Modeling Non-Linear and Non-Stationary Magnetic Signals: An Enhanced Signal Processing Strategy for Wind Time Series Analysis","authors":"Akhyurna Swain;Imraan Hossain;Chunhua Liu;Philip W. T. Pong","doi":"10.1109/TMAG.2025.3557261","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3557261","url":null,"abstract":"The magnetic-flux-based condition monitoring techniques are becoming increasingly popular due to their advantages, such as non-invasiveness, low costs, and ease of sensor installation. However, developing diagnostics and prognostics-based condition monitoring systems becomes challenging as magnetic signals-based wind time series exhibit non-linear and non-stationary characteristics due to being subjected to diverse combination of dynamic system behavior. The present data-driven feature extraction techniques, as well as knowledge-based and parameter estimator models, fall short in effectively quantifying these characteristics due to increased signal complexity and computation cost. Additionally, methods like the short-time Fourier transform that assumes stationarity of signals and has a fixed window size and discrete wavelet transform that has pre-defined wavelet bases have proven suboptimal for analyzing non-linear and non-stationary magnetic flux signals due time-frequency resolution tradeoffs. This research bridges the gap by investigating a new methodology of feature extraction to adeptly process the non-linear and non-stationary behavior in magnetic signals-based wind time series. This methodology is unique in nature since it utilizes magnetic signature-based fault condition indicators derived from the wind generator of a drive train model that accounts for the electromagnetic coupling. Additionally, the signal processing technique employed here considers non-linearity and non-stationarity that arises from wind characteristics, gearbox dynamics, and grid conditions and its effects on the magnetic flux density of the wind generator. Notably, this methodology offers new insights on motivation, applications, and significance of magnetic-flux-based condition monitoring techniques and highlights its potential as a critical tool for non-invasive fault detection on multiple components of a wind turbine.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 9","pages":"1-5"},"PeriodicalIF":1.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing the Resolution of Transcranial Magnetic Stimulation by Measuring the Magnetic Flux Density at the Cortical Surface 通过测量皮质表面磁通密度评估经颅磁刺激的分辨率

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-04-02 DOI: 10.1109/TMAG.2025.3556992

Aya Sato;Tetsuya Torii

{"title":"Assessing the Resolution of Transcranial Magnetic Stimulation by Measuring the Magnetic Flux Density at the Cortical Surface","authors":"Aya Sato;Tetsuya Torii","doi":"10.1109/TMAG.2025.3556992","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3556992","url":null,"abstract":"Transcranial magnetic stimulation (TMS) is a noninvasive and localized stimulation technique. Local stimulation is useful for studying brain functions and treating brain disorders. Previous studies have reported a stimulus resolution of approximately 5 mm or a stimulus area smaller than 50 mm2. Stimulus resolution has previously been evaluated using various measurement techniques. In this study, the magnetic flux density measured using a simplified system was analyzed using the quality factor (Q)-value. Magnetic pulses (at 75% intensity) were delivered using a figure-eight-shaped flat coil to a curved-head model. A distance of 15 mm from the stimulus coil to the center of the sensor coil was assumed as the same distance from the scalp to the cortex. The stimulation resolution was evaluated based on the magnetic flux density measured on the surface of the curved-head model, and the size of the stimulation area was evaluated based on the Q value. The results revealed that in both the x- and y-axes directions, the stimulation resolution on the cortical surface was less than 2 mm (<inline-formula> <tex-math>${p} lt 0.01$ </tex-math></inline-formula>). The Q-values from the peak to −0.1 and −3.0 dB were estimated at approximately 7.0 and 0.8 and at approximately 4.0 and 0.6 along the x- and y-axes, respectively. These results suggest that the use of a curved-head model enabled the TMS device to stimulate a target in a narrow resolution range and that Q-values can be used to easily evaluate the stimulation area.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 9","pages":"1-5"},"PeriodicalIF":1.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144920467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Implementation of ENG Metasurfaces for 5G Antenna Systems 5G天线系统的ENG元表面实现

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-04-02 DOI: 10.1109/TMAG.2025.3556991

T. Islam;A. Eroglu

{"title":"Implementation of ENG Metasurfaces for 5G Antenna Systems","authors":"T. Islam;A. Eroglu","doi":"10.1109/TMAG.2025.3556991","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3556991","url":null,"abstract":"In this article, epsilon-negative (ENG) metasurfaces and their application in enhancing antenna performance for 5G applications are presented. A unit cell designed to operate at 26 GHz has been introduced and validated using the 3-D electromagnetic simulator, computer simulation technology (CST). This unit cell is then implemented to construct a metasurface with a circularly polarized radiating patch antenna. Through the analysis of the S-parameters and permittivity of the ENG metasurface, improvements in gain and beamforming capabilities have been realized. A detailed analysis of beamforming capabilities has been performed using the minimum variance distortionless response (MVDR) algorithm. It is shown that the proposed design also enhances the wide-bandwidth capabilities of the antenna by employing a single metasurface layer. Additionally, the design offers a low profile and circular polarization, making it ideal for 5G millimeter-wave systems and multiple input multiple output (MIMO) applications. The results indicate that the ENG metasurface not only boosts antenna efficiency and gain but also enables adaptive beam steering, making it highly suitable for advanced communication systems requiring high data rates and reliable connectivity.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 9","pages":"1-5"},"PeriodicalIF":1.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Shielding Effectiveness of Ferrofluid Layer in the Presence of Oscillating Magnetic Field 振荡磁场作用下铁磁流体层的屏蔽效能

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-04-01 DOI: 10.1109/TMAG.2025.3556849

Huan-Kuang Kuan;Hsin-Chieh Hsieh;Yan-Hom Li

{"title":"Shielding Effectiveness of Ferrofluid Layer in the Presence of Oscillating Magnetic Field","authors":"Huan-Kuang Kuan;Hsin-Chieh Hsieh;Yan-Hom Li","doi":"10.1109/TMAG.2025.3556849","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3556849","url":null,"abstract":"This study investigates the effect of an oil-based ferrofluid layer subjected to oscillating magnetic fields on the shielding effectiveness (SE) of the electromagnetic wave (EMW) within 12.4–18 GHz. By leveraging the dynamic crest formations induced by varying the frequency from 0 to 105 Hz, the ferrofluid demonstrated significant adaptability and potential for effective electromagnetic interference (EMI) shielding. Results indicated that the ferrofluid crests exhibited pulsating behavior at lower oscillating frequencies of 1 Hz, enhancing SE to nearly 40 dB at 15.2 GHz. As the oscillation increased to 5 Hz, the crests displayed oscillatory instability, maintaining an SE peak of 37.7 dB at 17.6 GHz. For higher frequencies beyond 15 Hz, crest formation demonstrates a gradual diminishing behavior, transitioning into static or flat states, leading to a reduced SE. Additionally, the results revealed that thicker layers attenuate EM waves more effectively, even as crest dynamics become less pronounced. These findings highlight the capability of ferrofluid layers to achieve high EMI shielding through dynamic surface patterning, with thicker layers contributing to robust, adaptive, and flexible shielding solutions suitable for high-frequency electromagnetic environments.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 9","pages":"1-6"},"PeriodicalIF":1.9,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0