IEEJ Transactions on Electrical and Electronic Engineering最新文献

{"title":"Optimization Design of Dual-Parallel Rotor Permanent Magnet Motor Based on Dynamic Kriging Surrogate Model","authors":"Yang Chen,&nbsp;Dajun Tao,&nbsp;Shoupeng Li,&nbsp;Baojun Ge","doi":"10.1002/tee.24176","DOIUrl":"10.1002/tee.24176","url":null,"abstract":"<p>In order to reduce the torque ripple and the unbalanced electromagnetic force on the rotor of the dual-parallel rotor permanent magnet motor, a dynamic Kriging surrogate model is proposed to optimize its structural parameters. In the process of constructing the dynamic Kriging surrogate model, the concept of key sampling space is introduced, which solves the problems of low optimization efficiency and poor model accuracy of the traditional static surrogate model based on ‘one-time’ sampling. The topological structure of the dual-parallel rotor permanent magnet motor is introduced, and a prototype is used to verify the accuracy of the numerical model. The optimization parameters are determined, and the initial sampling space of each optimization parameter is determined according to the influence law of a single parameter on the optimization objectives. The initial sample database of the Kriging surrogate model is established, and a dynamic criterion for adding sample points is proposed. Combined with the NSGA-II algorithm, the surrogate model is constructed and solved. The optimal solution is substituted into the numerical model, which verifies the feasibility and correctness of the proposed optimization design method. The accuracy of the dynamic Kriging surrogate model is discussed and compared with the traditional static surrogate model. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"20 1","pages":"127-137"},"PeriodicalIF":1.0,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141781082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lightweight Improved Transmission Line External Mechanical Damage Threats Detection Algorithm","authors":"Yanhai Wang,&nbsp;Chenxin Guo,&nbsp;Deqiang Wu","doi":"10.1002/tee.24163","DOIUrl":"10.1002/tee.24163","url":null,"abstract":"<p>In monitoring transmission line external damage prevention, due to the limited memory computing power of the equipment, the image needs to be transmitted to the data center at regular intervals, resulting in a high false negative rate. Therefore, this paper proposes a target detection method based on lightweight YOLOv5s. First, DSConv and improved <i>E</i>-ELAN are used in Backbone to reduce the model's parameters. Then, GSConv and VoV-GSCSP are introduced in Neck to reduce the complexity of the model. Finally, the Mish activation function achieves more effective feature transfer. According to the experimental findings, the proposed model's parameters are about 37% smaller than the original model's, and the calculation amount is about 53% smaller. The detection accuracy on the self-built data set is the same, which proves that the proposed algorithm can reduce the model while maintaining high detection performance. It has specific practical significance for the terminal real-time detection of external mechanical damage targets. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 12","pages":"2002-2011"},"PeriodicalIF":1.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141781083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Loss Minimization Model Predictive Current Control for Linear Induction Motors","authors":"Shuhang Ma,&nbsp;Jinghong Zhao,&nbsp;Lv Yang,&nbsp;Yuanzheng Ma,&nbsp;Hanming Wang","doi":"10.1002/tee.24113","DOIUrl":"10.1002/tee.24113","url":null,"abstract":"<p>To further improve the operating efficiency of linear induction motor, this paper proposes a loss minimization model predictive current control method based on governable loss online calculation. First, the method derives the equivalent circuit of linear induction motor containing independent iron loss branches, and establishes the loss model containing iron loss. Second, the expressions of stator d-axis current with governable losses and secondary flux amplitude are derived from theoretical analysis, and then a given value of stator d-axis current is derived when the governable losses are minimal. Then, a chain observer is designed to observe the secondary flux and calculate the governable loss and stator d-axis current under the current operation. Finally, a method is proposed to introduce the stator d-axis current observation results into the model predictive current control, which ensures the loss suppression effect and improves the dynamic performance at the same time. In addition, this article also compares the loss minimization controllers with or without iron loss. The simulation results are consistent with the theory, and the optimal control of the secondary flux of the linear induction motor can be successfully realized, thus effectively reducing the energy loss of the motor in the dynamic operation process. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 9","pages":"1542-1552"},"PeriodicalIF":1.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141781084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interactive Skin Lesion Segmentation Considering Behavioral Preference in Clicking","authors":"Shuofeng Zhao,&nbsp;Chunzhi Gu,&nbsp;Jun Yu,&nbsp;Takuya Akashi,&nbsp;Chao Zhang","doi":"10.1002/tee.24172","DOIUrl":"10.1002/tee.24172","url":null,"abstract":"<p>Interactive Medical Image Segmentation (IMIS) aims to improve the accuracy of image segmentation by incorporating human guidance, primarily through click-based interactions. IMIS for skin lesion segmentation is a challenging task because the edges of lesion regions on the skin are often ambiguous, and training IMIS models requires the generation of pseudo-clicks to simulate human clicks. Most previous methods generate pseudo-clicks by sampling from the entire mis-segmented region. However, such clicks are inconsistent with human behavior, resulting in performance degradation, particularly for skin lesion segmentation. In this study, we address this issue by integrating human preference into the process of generating pseudo clicks to train the segmentation model, which is simple yet effective. Specifically, through a user study, we find that people are more inclined to click on larger mis-segmented regions during interactive segmentation. Inspired by this, a roulette selection strategy is used to generate the pseudo-clicks based on the area of the mis-segmented subregions. Our proposed method, <span>BehaviorClick</span>, can be easily integrated with existing interactive segmentation models to improve the performance. The accuracy improvement on four dermoscopic datasets under six state-of-the-art interactive segmentation methods is confirmed, which demonstrates the generalizability and effectiveness of our approach. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"20 1","pages":"89-100"},"PeriodicalIF":1.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141781176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of Low-Loss Electromagnetic Metamaterial with Non-uniform Linewidth for Magnetic Field Convergence in WPT System","authors":"Nenghong Xia,&nbsp;Huaqi Ma,&nbsp;Shuang Yan,&nbsp;Mengqi Chen,&nbsp;Xike Mao","doi":"10.1002/tee.24167","DOIUrl":"10.1002/tee.24167","url":null,"abstract":"<p>Electromagnetic metamaterial (EM metamaterial) with a double-layer spiral structure is often used to enhance the transmission efficiency of wireless power transfer (WPT). When EM metamaterial is used as an array, its AC resistance and loss cannot be ignored due to the high-frequency magnetic field of WPT. This paper decreases EM metamaterial's loss by increasing its quality factor according to the quality factor theory and proposes a novel structure. This structure adopts a non-uniform linewidth, which can decrease the proximity effect resistance of the EM metamaterial as well as maintain its high inductance. When using the proposed EM metamaterial to form an array, to enhance its effect in modulating the magnetic field, a hybrid EM metamaterial slab (HMS) is constructed by adjusting the series resonance capacitor. The corresponding samples of EM metamaterial with the non-uniform linewidth structure are developed. The experiment results prove that compared to the uniform linewidth structure, the equivalent resistance and loss of the non-uniform linewidth structure respectively are decreased by about 5.48% and 19.73%, and the quality factor is enhanced to 556.874. The HMS constructed by the proposed EM metamaterial can enhance the transmission efficiency of the experimental WPT system to 59.8%, which is about 2.1% higher than the HMS constructed by the normal EM metamaterial. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 12","pages":"2033-2043"},"PeriodicalIF":1.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Study on Alfvén Instability in a Magneto-Plasma Dynamic Arc-Jet Collisional Finite-β Plasma","authors":"Tetsuya Akitsu,&nbsp;Masaaki Inutake","doi":"10.1002/tee.24170","DOIUrl":"10.1002/tee.24170","url":null,"abstract":"<p>Test plasma high-density (TPH) was a research facility that started in the 1980s, generated high-density plasma using magneto-plasma-dynamic (MPD) arc-jet, <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>β</mi>\u0000 <mo>=</mo>\u0000 <mn>8</mn>\u0000 <mo>×</mo>\u0000 <msup>\u0000 <mn>10</mn>\u0000 <mrow>\u0000 <mo>−</mo>\u0000 <mn>3</mn>\u0000 </mrow>\u0000 </msup>\u0000 </mrow>\u0000 <annotation>$$ beta =8times {10}^{-3} $$</annotation>\u0000 </semantics></math>, where <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>β</mi>\u0000 </mrow>\u0000 <annotation>$$ beta $$</annotation>\u0000 </semantics></math> is the ratio of the kinetic pressure divided by the magnetic field pressure. In this work, we aim to authenticate the method used in the identification of the current-driven instability in high-frequency mode as Alfvén instability, standing on the linear trend of the difference of the phase of the Fourier transforms of the magnetic field fluctuation. The dependence of the wavenumber-versus-frequency shows a linear regression, close to the Alfvén velocity expected from the plasma density, ion mass and the strength of the magnetic field. With short wave packets of the left-hand, circularly polarized Alfvén waves were recorded for the spectral analysis and reconstructed the spatial changes in the phase spectrum. The dispersion in the frequency stretch was found to be traced as the Alfvén mode. Artifacts such as standing waves affect a narrow range of phase spectra and have large leverage as an error in the linear regression analysis. The coherence spectrum for the validation and the method of recovering data using maximum likelihood estimation will be presented. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"20 1","pages":"19-28"},"PeriodicalIF":1.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Feature Engineering-Based NILM Framework for Appliance Recognition Considering Data Class Imbalance","authors":"Yanzhen Li,&nbsp;Haixin Wang,&nbsp;Zihao Yang,&nbsp;Fausto Pedro Garcia Marquez,&nbsp;Zhe Chen,&nbsp;Junyou Yang,&nbsp;Yunlu Li","doi":"10.1002/tee.24164","DOIUrl":"10.1002/tee.24164","url":null,"abstract":"<p>Due to the diversity and randomness of residential consumption behavior, as well as the different share of domestic electricity demand by appliances, class imbalance problems exist in the non-intrusive load monitoring (NILM) system. The recognition model becomes biased toward the majority class, which makes the recognition of the minority class difficult. To tackle this challenge, we propose a novel NILM framework for appliance recognition to overcome the insufficient learning problems of the minority class, which combines a multi-domain feature extraction module, a two-stage feature selection, and a data oversampling method. Multiple features are extracted to make full of the complementarity of combined features to enhance appliance recognition. Furthermore, a two-stage feature selection based on minimal-redundancy-maximal-relevance (mRMR) and random forest (RF) is developed to select an optimal feature set. Subsequently, an oversampling method combining K-medoids and the synthetic minority oversampling technique (KM-SMOTE) with sampling weights is proposed for data augmentation of the minority class to handle imbalance learning problems. The effectiveness of the proposed method is verified by the experiments on the public dataset PLAID. The results show that, compared with the state-of-the-art techniques, the overall recognition accuracy and F1-score with the proposed method are enhanced by 4.61% and 2.04%, respectively. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 12","pages":"2012-2023"},"PeriodicalIF":1.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Continuous On-Chip Synthesis of Ag Nanoparticles Assisted by Resonant Microwave Heating Using a Post-Wall Waveguide","authors":"Kaito Fujitani,&nbsp;Mitsuyoshi Kishihara,&nbsp;Munehiro Sugiyama,&nbsp;Yuichi Utsumi","doi":"10.1002/tee.24169","DOIUrl":"10.1002/tee.24169","url":null,"abstract":"<p>Microfluidics made of dimethylpolysiloxane were developed for chemical synthesis using microwave heating at 24.125 GHz, and microwave efficiency was enhanced by the microwave resonance effect. In addition, the device was fabricated using a mold created using a 3D printer to reduce production costs. The microchip structure comprised a post-wall waveguide and a microchannel that passed through the waveguide. This post-wall waveguide also comprises metal columns (post-wall) instead of a conductor side wall, and easily introduces microchannels through the gaps between the metal columns. The waveguide length was adjusted to achieve a resonance frequency of 24 GHz using an electromagnetic wave simulation, assuming that the microchannel was filled with pure water. Microwaves with an input power of 4 W caused a maximum temperature increase of 93 °C; this result is ~10 °C higher than that of a microchip with non-resonant structure. In this study, Ag nanoparticles were synthesized using a chemical reaction induced by microwave irradiation of a chip flow system. Owing to irradiating the mixing reagent with microwaves of an input power of 4 W while controlling the flow rate at 0.7 μl/min, the formation of Ag nanoparticles with an average particle size of ~19.2 ± 2.4 nm was demonstrated by absorbance measurements and dynamic light scattering. It is expected that microwave microfluidics enhanced by the resonance effect will substantialize nanoparticle synthesis and high-efficiency automated chemical synthesis combined with multichemical unit operations. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 12","pages":"2072-2080"},"PeriodicalIF":1.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of a Database-Driven Controller for a Nonlinear System with Unknown Time-Delay","authors":"Yamato Tokunaga,&nbsp;Toru Yamamoto","doi":"10.1002/tee.24173","DOIUrl":"10.1002/tee.24173","url":null,"abstract":"<p>Lots of process systems such as chemical plants contain time-delay and nonlinearity. In particular, there are some cases that such a time-delay cannot be known in advance. Then, it is not easy to obtain good control performance under such situations. The database-driven PID control method has been proposed as an effective control method for nonlinear systems, but this method also cannot achieve good control performance for time-delay systems. In this paper, a design of database-driven controllers for a nonlinear system with unknown time-delay is newly proposed. Moreover, the effectiveness of the proposed scheme is verified by a simulation example. © 2024 The Author(s). <i>IEEJ Transactions on Electrical and Electronic Engineering</i> published by Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"20 1","pages":"149-151"},"PeriodicalIF":1.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/tee.24173","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of a Novel Consequent-Pole Dual-Stator Linear Permanent Magnet Vernier Machine Employing Mover Slot PM","authors":"Mingjie Wang,&nbsp;Pengcheng Li,&nbsp;Yanyan Li,&nbsp;Wanying Jia,&nbsp;Yongpeng Shen","doi":"10.1002/tee.24174","DOIUrl":"10.1002/tee.24174","url":null,"abstract":"<p>This paper proposes a novel consequent-pole dual-stator linear permanent magnet vernier machine (DS-LPMVM) with PM in the mover slot opening, which has a bi-directional flux modulation effect. The novelty of the proposed machine consists of consequent-pole double-sided topology with toroidal windings placed in the mover slot, as well as PMs both on the stator and mover slot to improve the air gap magnetic field. The dual-stator adopts misalignment structure to suppress detent force and produce steady thrust. The electromagnetic parameters of the proposed DS-LPMVM are evaluated and quantitatively compared with the conventional linear permanent magnet vernier machine (C-LPMVM) in terms of air-gap flux density, no-load back EMF, inductance, and thrust. The geometrical parameters are designed to reduce the detent force. By analyzing the optimized structure parameters of the two machines, the good electromagnetic performances of the proposed machine are verified by the finite element method (FEM) and semi-analytical method, and both results of the two methods are basically the same. It is found that the amount of PMs for the proposed machine is reduced by 20% compared to the C-LPMVM, but the average thrust is increased by 20.7% and the thrust ripple is reduced to 4.04%. The results show that the proposed DS-LPMVM has better flux modulation effect and thrust characteristics than C-LPMCM. Finally, a 12-slot, 10-pole pairs prototype was manufactured and tested. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"20 1","pages":"101-113"},"PeriodicalIF":1.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}