研究者詳細 - 綱田　錬

論文 - 綱田　錬

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International Conference on Electrical Machines (ICEM2024) 報告招待

綱田錬

電気学会論文誌B 2025年2月

Development of a Megawatt-class Engine Embedded Electric Machine for Aircraft Electrification 査読

Tomoya Yamamoto, Takehiro Jikumaru, Ren Tsunata, Masatsugu Takemoto

Proceedings - 27th International Conference on Electrical Machines and Systems, ICEMS2024 2024年11月

Basic Investigation of an IPMSM Employing Rotor Skew For Enhancing Output Power Under Field Weakening Control 査読

Yu Ichimura, Ren Tsunata, Masatsugu Takemoto, Jun Imai

Proceedings - IECON 2024 - 50th Annual Conference of the IEEE Industrial Electronics Society 1 - 6 2024年11月

Skewing Technology for Permanent Magnet Synchronous Motors: A Comprehensive Review and Recent Trends 査読

Ren Tsunata, Masatsugu Takemoto

IEEE Open Journal of the Industrial Electronics Society 5 1251 - 1273 2024年11月

Adaptive Design of Bilateral Control Systems for Multivariate Reference Models 査読

Kota Kunihiro, Jun Imai, Masatsugu Takemoto, Ren Tsunata

2024 24th International Conference on Control, Automation and Systems (ICCAS) 1194 - 1195 2024年10月

Comparative Study of Axial-Flux Machines Between Double Stator and YASA Structures Regarding Output Power Density and Efficiency in Traction Applications 査読

Yuki Nakano, Ren Tsunata, Masatsugu Takemoto, Jun Imai, Tatsuya Saito, Tomoyuki Ueno

Proceedings - 2024 IEEE Energy Conversion Congress and Exposition (ECCE) 5219 - 5225 2024年10月

Design of 160 kW, 50000 rpm Ultra-High Speed Traction Motor For Enhancing Output Power Density:Comparison of Different Rotor Core Materials 査読

Masaki Kimura, Ren Tsunata, Masatsugu Takemoto, Jun Imai

Proceedings - 2024 IEEE Energy Conversion Congress and Exposition (ECCE) 5083 - 5083 2024年10月

Impact of SMC Property on Axial Flux Machine Employing Ferrite PM in Traction Applications 査読

Ren Tsunata, Masatsugu Takemoto, Jun Imai, Tatsuya Saito, Tomoyuki Ueno

2024 International Conference on Electrical Machines (ICEM) 1 - 7 2024年9月

Superior Efficiency Under PWM Harmonic Current in an Axial-Flux PM Machine for HEV/EV Traction: Comparison With a Radial-Flux PM Machine 査読

Ren Tsunata, Masatsugu Takemoto, Jun Imai, Tatsuya Saito, Tomoyuki Ueno

IEEE Transactions on Industry Applications 60 ( 5 ) 6736 - 6751 2024年9月

Designing and Prototyping an Axial-Flux Machine Using Ferrite PM and Round Wire for Traction Applications: Comparison With a Radial-Flux Machine Using Nd-Fe-B PM and Rectangular Wire 査読

Ren Tsunata, Kosuke Izumiya, Masatsugu Takemoto, Jun Imai, Tatsuya Saito, Tomoyuki Ueno

IEEE Transactions on Industry Applications 60 ( 3 ) 3934 - 3949 2024年5月

Proposal of a Novel Air-Gap Structure For Magnet-Less 3-Axis Active Control-Type Magnetic Bearing With Cylindrical Rotor: Reducing Axial Length of Turbomachinery System 査読

Yuto Sho, Masatsugu Takemoto, Ren Tsunata, Jun Imai

IEEE International Future Energy Electronics Conference (IFEEC2023) 2023年11月

The Superiority of Efficiency Considering Harmonic Current caused by PWM inverter in Axial-Flux PM Machine Using Ferrite PM for Traction applications: Comparison to Radial-Flux PM Machines Using NdFeB PM 査読

Ren Tsunata, Masatsugu Takemoto, Jun Imai, Tatsuya Saito, Tomoyuki Ueno

Proceedings - 2023 IEEE Energy Conversion Congress and Exposition (ECCE) 2023年11月

Teaching Method for Electrical Machines Focusing on Differences Between Simulation and Experimental Verification 査読

Ren Tsunata, Masatsugu Takemoto

2023 IEEE 10th International Conference on E-Learning in Industrial Electronics (ICELIE) 2023年10月

A Proposal of an Axial-Flux Permanent-Magnet Machine Employing SMC Core With Tooth-Tips Constructed by One-Pressing Process: Improving Torque and Manufacturability 査読

Ren Tsunata, Masatsugu Takemoto, Jun Imai, Tatsuya Saito, Tomoyuki Ueno

IEEE Access 11 109435 - 109447 2023年10月

Design and Analysis of Hybrid-Excitation Variable Flux Memory Motor for Traction Applications: Improving Output Power in High-Speed Area During Six-Step Operation Mode 査読

Ren Tsunata, Keito Yokomichi, Masatsugu Takemoto, Jun Imai

IEEE Access 11 82024 - 82036 2023年8月

Hybrid-Excitation Variable Flux Memory Motor for Enhancing Output Power density in Traction Applications in Six-Step Operation Mode 査読

Ren Tsunata, Keito Yokomichi, Masatsugu Takemoto, Jun Imai

2023 IEEE International Magnetics Conference (INTERMAG) 2023年5月

Reduction in Eddy Current Loss of Special Rectangular Windings in High-Torque IPMSM Used for Wind Generator 査読

Xianji Tao, Masatsugu Takemoto, Ren Tsunata, Satoshi Ogasawara

IEEE Access 11 4740 - 4751 2023年

Novel Rotor Structure Employing Large Flux Barrier and Disproportional Airgap for Enhancing Efficiency of IPMSM Adopting Concentrated Winding Structure 査読

Xianji Tao, Masatsugu Takemoto, Ren Tsunata, Satoshi Ogasawara

IEEE Access 11 2848 - 2862 2023年

Comparison of Thermal Characteristics in Various Aspect Ratios for Radial-Flux and Axial-Flux Permanent Magnet Machines 査読

Ren Tsunata, Masatsugu Takemoto, Jun Imai, Tatsuya Saito, Tomoyuki Ueno

IEEE Transactions on Industry Applications 1 - 15 2023年

Evaluation of Switching Ripple Effect on Efficiency of Novel Spoke-Type IPMSM Using Dy-Free Magnet -Comparison to IPMSM using NbFeB Magnet 査読

Jiseong Park, Ren Tsunata, Masatsugu Takemoto, Koji Orikawa, Satoshi Ogasawara

Proceedings - 2022 International Conference on Electrical Machines and Systems, ICEMS 2022 2022年11月

A Proposal of Hybrid Excitation Variable Flux Memory Motor Having Field Winding with Magnetization Function in the Rotor 査読

Keito Yokomichi, Ren Tsunata, Masatsugu Takemoto, Jun Imai

Proceedings - 2022 IEEE Energy Conversion Congress and Exposition (ECCE) 2022年10月

Dividing Repulsion Permanent Magnets for Enhancing Suspension Force Characteristics in a 1-axis Active Control Type Magnetic Levitation Pump 査読

Koki Terada, Masatsugu Takemoto, Ren Tsunata, Jun Imai

Proceedings - IECON 2022 - 48th Annual Conference of the IEEE Industrial Electronics Society 2022年10月

Hybrid-Type PM Motor for Electric Vehicle Traction with improved Reluctance Torque 査読

Jiseong Park, Ren Tsunata, Masatsugu Takemoto, Koji Orikawa, Satoshi Ogasawara

Journal of the Japan Society of Applied Electromagnetics and Mechanics 2022年10月

Comparison of Thermal Characteristic in Various Aspect Ratios of Radial-Flux and Axial-Flux Permanent Magnet Machines 査読

Ren Tsunata, Masatsugu Takemoto, Jun Imai, Tatsuya Saito, Tomoyuki Ueno

Proceedings - 2022 IEEE Energy Conversion Congress and Exposition (ECCE) 2022年10月

Examination of the Characteristics of a Hybrid Excitation Motor with Field Winding on a Rotor for Electric Vehicle and Hybrid Vehicle Traction 査読

Ryusyo Nakazawa, Masatsugu Takemoto, Satoshi Ogasawara, Ren Tsunata, Koji Orikawa

Proceedings - IECON 2022 - 48th Annual Conference of the IEEE Industrial Electronics Society 2022年10月

Axial-Flux Machine Using Ferrite PM and Round Wire Competitive to Radial-Flux Machine Using Nd-Fe-B PM for HEV Traction 査読

Kosuke Izumiya, Ren Tsunata, Masatsugu Takemoto, Jun Imai, Tatsuya Saito, Tomoyuki Ueno

Proceedings - 2022 International Conference on Electrical Machines, ICEM 2022 2022年9月

SMC Development Guidelines for Axial Flux PM Machines Employing Coreless Rotor Structure for Enhancing Efficiency Based on Experimental Results 査読

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Tatsuya Saito, Tomoyuki Ueno

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 58 ( 3 ) 3470 - 3485 2022年3月

Examination of enhancing efficiency of axial gap motor in high speed and high torque region by adopting neodymium bonded magnet 査読

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Koji Orikawa, Tatsuya Saito, Tomoyuki Ueno

IEEJ Journal of Industry Applications 10 ( 4 ) 487 - 496 2021年7月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

In recent years, more than half of the electric power generated in the country is being consumed by motors. Therefore, high performance motors are desired especially for industrial applications. In addition, it is desirable to reduce motor size. Recently, motors called axial gap type have been proposed and researched to achieve both high torque and small size. Axial gap motors are generally suitable for applications requiring flat shape such as a disk. Conventional axial gap motors frequently employ Nd sintered permanent magnets (PMs) to achieve high torque. However, axial gap motors with Nd sintered PMs are not very efficient at high rotational speed due to the eddy current loss arising in the PM. Axial gap motors that use ferrite PMs have also been proposed, but torque density is low. In this paper, an axial gap motor using Nd bonded PMs is proposed to achieve high efficiency in the high-speed and high-torque region. The proposed axial gap motor using Nd bonded PM is compared with other axial gap motors employing Nd sintered PM and ferrite PM through 3D-FEA and experiments. Consequently, it was found that the Nd bonded PM is more effective in enhancing the efficiency of an axial gap motor in the high-speed and high-torque region, compared with Nd sintered PM and ferrite PM.

DOI： 10.1541/ieejjia.20004135

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Variable Flux Memory Motor Employing Double-Layer Delta-Type PM Arrangement and Large Flux Barrier for Traction Applications 査読

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Koji Orikawa

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 57 ( 4 ) 3545 - 3561 2021年7月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

This article consists of two important topics regarding variable flux memory motors (VFMMs). The first topic is magnetization characteristic analysis of VFMMs having a double-layer permanent magnet (PM). Two-dimensional simulations are executed to clarify relationship between magnetization characteristic and ratio of the double-layer PM. In addition, a prototype of a compact size VFMM is fabricated, and experiments are also carried out to investigate accuracy of magnetization characteristic analysis. The second topic is the proposed VFMM employing double-layer delta-type PM arrangements and extended flux barriers for traction applications. Conventional VFMMs have three critical issues, which are as follows: asymmetric positive and negative magnetizing current pulses, increase in the iron loss due to harmonics caused by demagnetized variable flux PMs (VPMs), and unintentional demagnetization of VPMs under load condition. The proposed VFMM can overcome the abovementioned problems by employing double-layer delta-type PM arrangements and extended flux barriers. In addition, the proposed VFMM achieves much higher efficiency than that of the target motor mounted in TOYOTA Prius fourth-generation over a wide operating range.

DOI： 10.1109/TIA.2021.3068329

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Investigation of Dy-Free Hybrid PM Motor Based on Spoke-Type Rotor for Automotive Applications 査読

Jiseong Park, Ren Tsunata, Masatsugu Takemoto, Koji Orikawa, Satoshi Ogasawara

2021 IEEE International Electric Machines and Drives Conference, IEMDC 2021 2021年5月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

NdFeB permanent magnets (Nd-PM) can achieve a coercivity of up to 21 kOe without dysprosium due to the development of manufacturing technology. However, due to the high-temperature operation characteristics of vehicle traction motors, Nd-PM over 25kOe is mainly applied. In this paper, 21kOe Nd-PM and 5.5kOe ferrite-PM (Fe-PM) are simultaneously applied, and a hybrid PM motor (HPMM) suitable for environmental temperature conditions of vehicle traction motors is proposed. HPMM is divided into serial configuration and parallel configuration according to the arrangement of each PM. This paper compares the pros and cons of each configuration and presents rotor structures that can improve demagnetization durability and torque characteristics. After comparing the performance characteristics of each rotor structure through 2D-FEM, finally, an HPMM suitable for vehicle traction motors is proposed. Also, the proposed HPMM shows the same torque and power density as the traction motor of TOYOTA PRIUS 4th-generation hybrid electric vehicle (HEV), the target motor. At the same time, the proposed HPMM reduced the usage of Nd-PM by 47% and the total PM cost by 10% compared to the target motor.

DOI： 10.1109/IEMDC47953.2021.9449493

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Design of Hybrid-Type PM Motor for Electric Vehicle Traction Using Trapezoidal Ferrite-PM to Improve Reluctance Torque 査読

Jiseong Park, Ren Tsunata, Masatsugu Takemoto, Koji Orikawa, Satoshi Ogasawara

Proceedings - 2021 IEEE International Magnetics Conference (INTERMAG) 311 2021年4月

Examination of enhancing efficiency of axial gap motor in high speed and high torque region by adopting neodymium bonded magnet

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Koji Orikawa, Tatsuya Saito, Tomoyuki Ueno

IEEJ Transactions on Industry Applications 140 ( 12 ) 939 - 948 2020年12月

掲載種別：研究論文（学術雑誌）

DOI： 10.1541/ieejias.140.949

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ネオジムボンド磁石の適用によるアキシャルギャップモータの高速重負荷領域の高効率化に関する検討査読

綱田錬, 竹本真紹, 小笠原悟司, 折川幸司, 齋藤達哉, 上野友之

電気学会論文誌D 140 ( 12 ) 939 - 948 2020年12月

担当区分：筆頭著者,　責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人電気学会

DOI： 10.1541/ieejias.140.939

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その他リンク： http://id.ndl.go.jp/bib/030793591

Investigation of Enhancing Reluctance Torque of a Delta-Type Variable Flux Memory Motor Having Large Flux Barrier for EV/HEV Traction 査読

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Koji Orikawa

Proceedings - 2020 IEEE Energy Conversion Congress and Exposition (ECCE) 53 - 60 2020年10月

Development Policy of SMC to Improve Efficiency of Axial Gap Motor Employing Coreless Rotor Structure 査読

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Tatsuya Saito, Tomoyuki Ueno

Proceedings - 2020 International Conference on Electrical Machines, ICEM 2020 1644 - 1650 2020年8月

コアレス回転子形状を有するアキシャルギャップモータにおける高効率化のためのSMC材料の開発方針の検討査読

綱田錬, 竹本真紹, 小笠原悟司, 折川幸司, 齋藤達哉, 榎園勇太, 上野友之

日本AEM学会誌 28 ( 2 ) 146 - 155 2020年

担当区分：筆頭著者,　責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：日本AEM学会

<p> In recent years, electric motors having flat shape are desired in order to minimize system size as well as enhancing the efficiency. Therefore, axial gap motors (AGMs) have attracted significant attention because they can achieve higher torque density in flat shape than conventional radial gap motors. In general, AGMs employ Soft magnetic composite (SMC) for stator core since they have three dimensional magnetic paths. If AGMs employ SMC which has low iron loss characteristic, the efficiency can be improved. However, average torque is decreased because SMC basically has tradeoff relationship between iron loss characteristic and permeability. Hence, in this research, AGM having coreless rotor structure that torque performance is not easily affected by the permeability of SMC is proposed. In this paper, many virtual SMC materials which have different iron loss and permeability is considered for the proposed AGM. Finally, suitable SMC characteristic to enhance the efficiency over a wide operating range is revealed by three-dimensional finite element analysis (3D-FEA).</p>

DOI： 10.14243/jsaem.28.146

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A Proposal of Ultra-Flat Axial Gap Motor Employing C-type SMC Core 査読

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Tomoyuki Ueno, Tatsuya Saitoh

Proceedings - IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society 874 - 879 2019年10月

A Proposal of a Delta-Type Salient Pole Variable Flux Memory Motor Having Large Flux Barrier for Traction Applications 査読

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Koji Orikawa

Proceedings - 2019 IEEE Energy Conversion Congress and Exposition (ECCE) 6054 - 6061 2019年10月

Development and Evaluation of an Axial Gap Motor Using Neodymium Bonded Magnet 査読

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Asako Watanabe, Tomoyuki Ueno, Koji Yamada

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 54 ( 1 ) 254 - 262 2018年1月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

In general, radial gap motors employing neodymium sintered permanent magnet (Nd sintered PM) are used to achieve high torque density in many applications. However, the motors are not suited to a flat, disk-like shape because the dead space, such as the coil ends, occupies most of the motor volume. Therefore, axial gap motors are frequently used for flat shape instead of radial gap motors. Nd sintered PM is a well-known high-performance magnet that has high residual magnetic flux density, but eddy current loss easily occurs in the magnet because of its high conductivity. In axial gap motors for industrial applications, it is difficult to take measures against eddy current loss of Nd sintered PM in terms of cost. Therefore, general axial gap motors employing Nd sintered PM often have unsatisfactory characteristics, such as low efficiency, even though the motor produces high torque. On the other hand, radial gap motors can take measures to suppress eddy current in PMs easily if radial gap motors employ interior permanent magnet structure. Accordingly, this paper discusses an axial gap motor employing neodymium bonded permanent magnet (Nd bonded PM) for flat shape. Compared with Nd sintered PM, Nd bonded PM has lower residual magnetic flux density, but also lower cost. In addition, Nd bonded PM has extremely low eddy current loss due to its low conductivity. It is found from three-dimensional finite element analysis and experimental results that the axial gap motor employing Nd bonded PM can achieve higher torque and higher efficiency compared with the radial gap motor employing Nd sintered PM with the same PM weight and a flat shape.

DOI： 10.1109/TIA.2017.2710123

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Investigation of enhancing efficiency and acceleration in a flat shape axial gap motor having high torque characteristic 査読

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Asako Watanabe, Tomoyuki Ueno, Koji Yamada

Proceedings - 2017 IEEE International Conference on Mechatronics, ICM 2017 278 - 283 2017年5月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Institute of Electrical and Electronics Engineers Inc.

In recent years, flat shape motors are desired for many industrial applications such as robot arm, automobiles and so on. Thus, this paper discusses axial gap motors which have advantage for flat shape. In general, axial gap motors have high torque density with flat shape because of its wide air-gap area. Axial gap motors are therefore used for limited space like disk shape instead of radial gap motors which are the most general motor. However, compared with radial gap motors, the acceleration of axial gap motors is relatively lower because of the larger moment of inertia. In this paper, rotor structure to enhance the acceleration of axial gap motors is proposed and analyzed by 3D-FEA. In addition, material for permanent magnet of axial gap motors is properly selected in order to enhance efficiency at high speed and high torque area. Finally, prototypes of both axial and radial gap motor with flat shape are evaluated by some experiments. It is found that proposed axial gap motor can achieve the higher torque and efficiency compared with the radial gap motor with flat shape. Proposed axial gap motor additionally achieved the slightly larger acceleration compared with the radial gap motor.

DOI： 10.1109/ICMECH.2017.7921117

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Development and evaluation of an axial gap motor with neodymium bonded magnet 査読

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Asako Watanabe, Tomoyuki Ueno, Koji Yamada

Proceedings - 2016 22nd International Conference on Electrical Machines, ICEM 2016 272 - 278 2016年11月

In general, radial gap motors employing neodymium sintered permanent magnet (Nd sintered PM) are used to achieve high torque density in many applications. However, the motors are not suited to a flat, disk-like shape because the dead space, such as the coil ends, occupies most of the motor volume. Therefore, axial gap motors are frequently used for flat shape instead of radial gap motors. Nd sintered PM is a well-known high-performance magnet that has high residual magnetic flux density, but eddy current loss easily occurs in the magnet because of its high conductivity. In axial gap motors for industrial applications, it is difficult to make measure against eddy current loss of Nd sintered PM in terms of cost. Therefore, general axial gap motors employing Nd sintered PM often have the unsatisfactory characteristics such as low efficiency, even though the motor produces high torque. Accordingly, this paper discusses an axial gap motor employing neodymium bonded permanent magnet (Nd bonded PM) for flat shape. Compared with Nd sintered PM, Nd bonded PM has lower residual magnetic flux density, but also lower cost. In addition, Nd bonded PM has extremely low eddy current loss due to its low conductivity. It is found from 3D-FEA and experimental results that the axial gap motor employing Nd bonded PM can achieve higher torque and higher efficiency compared with the radial gap motor employing Nd sintered PM with the same PM weight and a flat shape.

DOI： 10.1109/ICELMACH.2016.7732538

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