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Magnetic Bearing Design and Operation to Minimize the Axial Length of High-speed Rotor

Transactions of the Korean Institute of Electrical Engineers 2024年第2期73卷 305-311页

作者： Park, Joo-Hong Noh, Sujin Cho, Han-Wook Dept. of Electrical Electronics and Communication Engineering Edu. Chungnam National University Korea Republic of Dept. of Convergence System Engineering Chungnam National University Korea Republic of

In this study, a fork-type heteropolar(FHP) magnetic bearing is proposed as an innovative advancement in magnetic bearing technology. The FHP magnetic bearing enhances winding density within the slot by positioning bobbins, and housing paired windings, side by side. In addition, a comparative analysis was conducted against the conventional heteropolar(CHP) magnetic bearing. The design of the FHP magnetic bearing optimizes the width of the magnetic pole surface by aligning it with the axis direction, enabling maximum force generation. Mathematical modeling and Campbell diagram analysis were employed to quantify the reduction in axial space achieved by the FHP magnetic bearing. Finite element analysis was performed to examine force characteristics and experimental verification confirmed the stability of the FHP magnetic bearing. Additionally, the FHP magnetic bearing was applied to an oil-free refrigerant compressor, validating its practical viability in industrial applications. © 2024 Korean Institute of Electrical Engineers. All rights reserved.

关键词： Magnetic bearings

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Design and Characteristics Comparative Research of 2MW Class Fully Air-core Superconducting Motor

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Transactions of the Korean Institute of Electrical Engineers 2023年第11期72卷 1386-1392页

作者： Noh, Sujin Shin, Kyung-Hun Bang, Tae-Kyoung Cho, Han-Wook Dept. of Electrical Electronics and Communication Engineering Edu. Chungnam National University Korea Republic of Dept. of Convergence System Engineering Chungnam National University Korea Republic of Dept. of Power System Engineering Chonnam National University Korea Republic of HYUNDAI MOBIS Advanced Brake System Engineering Cell Korea Republic of

The imperative of shifting the transportation sector towards environmentally sustainable electric propulsion has become unmistakable. Superconducting motors have emerged as a revolutionary solution, offering intrinsic benefits such as compactness, lightweight design, and exceptional efficiency in comparison to conventional motors. These attributes hold immense promise, particularly when harnessed in the propulsion systems of expansive maritime vessels and aviation crafts, opening up previously unattainable frontiers of power density. In this paper, a 2MW fully air-core superconducting motor was designed for electric propulsion applications. Subsequently, its characteristics were compared with those of an iron-core superconducting motor. Through the analysis of parameters such as weight, power density, and magnetic flux density, it was conclusively established that for aviation and marine propulsion systems, the more suitable motor is the fully air-core superconducting motor. Copyright © The Korean Institute of Electrical Engineers.

关键词： Electric propulsion

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Real-Time Electric Shock Safety Diagnosis system for Switchgear Based on Capacitance and Relative Leakage Distribution Analysis Algorithm

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Transactions of the Korean Institute of Electrical Engineers 2025年第5期74卷 977-982页

作者： Yoo, Seungcheol Kim, Kangmin Jeong, JunHo So, Yoonsub Park, Young Yoon, YongHo Choi, Wonseok Dept. of Electrical Engineering Hanbat National University Korea Republic of SM ELECTRONICS Co. Ltd Korea Republic of Dept. of Electrical System Engineering Hanbat National University Korea Republic of Department of Electrical Engineering Gwangju University Korea Republic of

In this paper describes the distribution panel real-time electrocution safety diagnosis system technology based on the capacitance and relative leakage distribution analysis algorithm, and applies the safety technology to prevent electrocution accidents caused by leakage current such as faulty ground facilities and connection status. A distribution panel capacitance detection module and a facility multi-point leakage detection module were developed. Through this, a technology to prevent electrocution accidents by monitoring the capacitance and leakage current of the distribution facility is secured, and it is expected that by applying a technology to detect abnormal conditions by analyzing the capacitance and leakage current signals inside the distribution panel, the cost required for regular inspection in the power facility system can be reduced and electric accidents can be prevented. Copyright © The Korean Institute of Electrical Engineers.

关键词： Electric accidents

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The Method of for Analyzing EMI Conducted Noise Analysis in Power Conversion Devices using Partial Element Equivalent Circuit Modeling

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Transactions of the Korean Institute of Electrical Engineers 2023年第7期72卷 809-819页

作者： Seo, Hyun-Woo Kim, Rae-Young Dept. of Electrical Engineering Hanyang University Korea Republic of Dept. of Energy Power Electronics Control System Lab Hanyang University Korea Republic of

EMI conducted noise is becoming increasingly important in power conversion systems, and various analysis methods are being researched. The proposed method enables accurate EMI conducted noise analysis by extracting partial element equivalent circuits from the 3D structure of power cables and PCBs, and the extracted model can be interpreted in SPICE simulations. The implemented inverter operation mode of Totem-Pole bridge-less PFC in the EMI conducted noise analysis simulation model shows a good correlation between simulation results and experimental results in all CE bands. Furthermore, this method identifies the main causes of EMI noise through CM (Common Mode) and DM (Differential Mode) noise analysis, and proposes a method to effectively attenuate EMI noise through CM coil modeling. Therefore, the EMI conduction noise analysis method using simulation models allows for efficient prediction of EMI conduction noise in advance. Copyright The Korean Institute of Electrical Engineers.

关键词： Poles

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Machine Learning Applications in Predictive Fetal Health Assessment and Early Intervention 2

Machine Learning Applications in Predictive Fetal Health Ass...

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2nd International Conference on Advanced Innovations in Smart Cities, ICAISC 2025

作者： Shib, Sowrov Komar Dipto, Durjoy Roy Rahman, Tanvir Asia, Jannatul Umma Ara, Anjuman Shufian, Abu American International University-Bangladesh Dept. of Electrical and Electronics Engineering Dhaka Bangladesh Dhaka Bangladesh Lamar University Dept. of Management Information System Texas United States

ISBN: (纸本)9798331506995

Fetal health involves monitoring the well-being of the unborn baby, identifying potential complications such as distress, congenital issues and ensuring timely interventions for a healthy pregnancy and successful delivery. This study presents a machine learning framework aimed at improving fetal health predictions with a focus on the need for early detection of complications like fetal distress. Traditional monitoring tools such as cardiotocography and ultrasound, often rely on subjective interpretation, leading to delays or inaccuracies in diagnoses. To tackle these issues, advanced machine learning techniques such as XGBoost, Blending, and Stacking are applied. These models are assessed for their ability to handle complex fetal health data and improve classification accuracy. While Random Forest and K-Nearest Neighbors show moderate success, XGBoost, Blending, and Stacking perform better, achieving 96% accuracy, reducing errors and enhancing clinical decision-making. For small datasets and generalization issues and using multiple fetal health indicators for stronger predictions. Automated machine learning models offer significant improvements in the speed and precision of fetal health assessments, helping reduce risks for both mother, child and advancing AI applications in prenatal care for improved outcomes. © 2025 IEEE.

关键词： Obstetrics

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Comparison of Three Reconfiguration Levers to Optimize a Reconfigurable Production Workshop 9

Comparison of Three Reconfiguration Levers to Optimize a Rec...

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9th International Conference on Control, Decision and Information Technologies, CoDIT 2023

作者： Clarion, J.B. François, J. Grebennik, I. Dupas, R. Bordeaux France Kharkiv National University of Radio Electronics Dept. of System Engineering Kharkiv Ukraine

ISBN: (纸本)9798350311402

The problem studied focuses on the facility layout problem (FLP) that arises in reconfigurable manufacturing systems (RMS). The goal is to optimize the distance traveled by an autonomous mobile robot (AMR) to move products between several workstations. The proposed solving approach takes into account the empty and loaded trips made by the robot. Three reconfiguration levers are evaluated: the location of the machine in the workshop (i.e layout), its orientation, and its shape. We use the simulated annealing meta-heuristic to tackle this NP-hard problem. The results obtained on a set of 25-worstations instances highlight the value of orientation changes compared to the other two levers. © 2023 IEEE.

关键词： Simulated annealing

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Polarization and angle-of-incidence insensitive, single-layer FSS for RCS reduction 7

Polarization and angle-of-incidence insensitive, single-laye...

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7th International Electromagnetic Compatibility Conference, EMC Turkiye 2023

作者： Can, Sultan Tural, Fahrettin Durlu, Çaǧlayan Ankara University Golbasi Dept. of Electrical Electronics Engineering Ankara Turkey TUSAŞ Aerospace Industries Dept. of RF System Integration Ankara Turkey

ISBN: (纸本)9798350342130

This paper demonstrates a unit cell single-layer Frequency Selective Surface (FSS) layer for sandwich radomes for filtering X-band operations with a center frequency of 10 GHz having a bandwidth of 3.45GHz. The design was optimized as having a 7x7 array size to mimic the unit cell model accurately. The structure is evaluated for TE and TM polarizations for different angles of incidence values having a step size of 1°. A sample radome for a fighter nose is considered as it is covered by the proposed structure FSS and compared with the radome fully PEC material on its surface. Results showed that the FSS implemented version has good agreement with the results of the PEC radome design. Comparisons are also presented in the results. © 2023 IEEE.

关键词： Frequency selective surfaces

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Antenna compatibility of a single layer-FSS radome design for filtering sub-X-band applications 7

Antenna compatibility of a single layer-FSS radome design fo...

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7th International Electromagnetic Compatibility Conference, EMC Turkiye 2023

作者： Can, Sultan Tural, Fahrettin Durlu, Çaǧlayan Ankara University Dept. of Electrical Electronics Engineering Ankara Golbasi Turkey TUSAŞ Aerospace Industries Dept. of RF System Integration Ankara Turkey

ISBN: (纸本)9798350342130

This paper demonstrates a single-layer polarization-independent Frequency Selective Surface (FSS) layer for sandwich radomes for filtering sub-X-band applications. Thermal plastic-based FSS performed a power loss of below 1% while filtering the band having a center frequency of 6.69 GHz with a bandwidth of 4.3 GHz. To demonstrate the impact of the radome FSS on the antenna performance, an array antenna operating at an X-band having a center frequency of 10GHz presented providing gain of 14 dBi is presented. The results of the single antenna array and the FSS-loaded configuration are compared and the results are presented for different polarization angles. © 2023 IEEE.

关键词： Frequency selective surfaces

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Design and Hardware Realization of 32-Bit Multipliers Based on FPGAs

Design and Hardware Realization of 32-Bit Multipliers Based ...

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2022 International Conference on Electrical engineering and Informatics, ICELTICs 2022

作者： Zulhelmi, Zulhelmi Ali, Sawal Hamid Md. Nasaruddin, Nasaruddin Universitas Syiah Kuala Dept. of Electrical and Computer Engineering Banda Aceh Indonesia Universiti Kebangsaan Malaysia Dept. of Electrical Electronics and System Engineering Bangi Malaysia Universiti Kebangsaan Malaysia Dept. Name of Organization Dept. of Electrical Electronics and System Engineering Bangi Malaysia

ISBN: (数字)9781665487665

ISBN: (纸本)9781665487665

A new approach for optimized multipliers based on the Vedic mathematics principle is introduced. The design aims to meet current Field-Programmable Gate Arrays (FPGAs) requirements. However, the need for high-speed multipliers in Digital Signal Processing (DSP) has become a challenge for researchers to propose and find new multiplier designs that meet the DSP requirement. This paper presents a new 32-bit multiplier suitable for being employed on DSP systems. The multiplier employs the Vedic mathematics principle to produce partial products using fundamental 4x4 multipliers developed by utilizing 6-input LUTs and multiplexers in the same slices yielding a drastic decrease in the area when implemented FPGAs. The use of Carry Ripple/Chain Adder is to get final products. Moreover, the multiplier is developed in a non-pipeline multiplier schema, which is designed without a clock signal in its operation. This structure is the same as combinatorial circuitry. The proposed multiplier has a maximum delay of 14.529 ns, less than other similar multiplier designs. © 2022 IEEE.

关键词： Application specific integrated circuits

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Multi Frequency Regenerative Amplifier

Multi Frequency Regenerative Amplifier

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2023 Seminar on Networks, Circuits and systems, NCS 2023

作者： Shirokova, Elena I. Konovalova, Evgeniya O. Shirokov, Igor B. Sevastopol State University Dept. of Radioelectronics Systems and Technologies Sevastopol Russia Sevastopol State University Dept. Information System Sevastopol Russia Sevastopol State University Dept. Electronics Engineering Sevastopol Russia

ISBN: (纸本)9798350370386

The proposed article discusses the development of a new component, a multi-frequency regenerative transistor amplifier used to build radio engineering and telecommunication systems for various purposes. The qualitative indicators of a multi-frequency regenerative transistor amplifier and many advantages of such an amplifier over its prototype, a regenerative transistor amplifier, such as noise level, gain coefficient, amount of energy consumed, are studied and described. The simplicity of the design of a multi-frequency regenerative transistor amplifier is shown, its differences from the design of the prototype, and the principle of operation of the proposed device are explained. © 2023 IEEE.

关键词： Transistors

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