研究者詳細 - 竹本　真紹

論文 - 竹本　真紹

分割表示 210 件中 101 - 120 件目／全件表示 >>

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

2016 XXII INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES (ICEM) 272 - 278 2016年

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：IEEE

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.

Web of Science

researchmap

An Examination for Improvement of Constant Output Characteristics at High-Speed Region in a Spoke-Type IPMSM using Ferrite Permanent Magnet by Changing the Shape of Rotor Surface 査読

Shova Nagano, Masatsugu Takemoto, Satoshi Ogasawara

2016 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 2016年

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：IEEE

In recent years, interior permanent magnet synchronous motors (IPMSMs) using ferrite permanent magnet are being studied for high power density motor application, such as electric vehicles. However, the residual flux density of ferrite magnet is lower than that of rare-earth permanent magnet. Thus, in general, it is difficult for IPMSMs using ferrite magnet to maintain constant high output power in high-speed region. Accordingly, a spoke-type IPMSM using ferrite magnet with specification similar to the currently commercially available IPMSM using rare-earth magnet is examined in this research. Owing to increasing constant output power in high-speed region, analysis with 3D-FEA was conducted and the analysis results show that the constant output characteristics in high-speed region are improved by contriving the shape of the rotor surface. Moreover, experimental results of a prototype of the examined spoke-type IPMSM using ferrite magnet will be presented in this paper.

Web of Science

researchmap

A Basic Study of a Novel Homopolar-Type Magnetic Bearing Unifying Four C-Shaped Cores for High Output and Low Loss 査読

Matsuzaki Tatsuya, Takemoto Masatsugu, Ogasawara Satoshi, Nishihama Kazuo, Kori Daisuke, Nagata Koichiro

IEEE TRANSACTIONS ON MAGNETICS 51 ( 11 ) 2015年11月

Size and weight reduction of an in-wheel axial-gap motor using ferrite permanent magnets for electric city commuters 査読

T. Takahashi, M. Takemoto, S. Ogasawara, W. Hino, K. Takezaki

2015 18th International Conference on Electrical Machines and Systems (ICEMS) 2015年10月

圧縮機運転時のモータ巻線・ステータ間静電容量および比誘電率の推定査読

TANG Yizhanyi, 小笠原悟司, 竹本真紹, 金森正樹, 石田圭一, 遠藤隆久

日本冷凍空調学会論文集 32 ( 3 ) 255 - 261 2015年9月

記述言語：日本語出版者・発行元：公益社団法人日本冷凍空調学会

<tt>本論文では，圧縮機運転中におけるモータ巻線とステータの間の浮遊静電容量と，その時その空間に存在する冷媒と潤滑油の平均的な比誘電率を推定する方法を提案する．提案法では，特別な実験装置やセンサを用いず，インバータエアコンの接地線に流れる漏れ電流波形から等価回路パラメータを同定し，さらに冷媒と潤滑油が封入されていない圧縮機用モータの浮遊静電容量との比較から比誘電率を求めて，これを実現している．そのため，この方法は圧縮機内部の状態と浮遊静電容量ならびに比誘電率との関係を検討することにも利用でき，これらの推定値はエアコン用圧縮機駆動システムの電磁妨害 (</tt>EMI<tt>)の検討や設計に有効で</tt><tt>ある． </tt>

DOI： 10.11322/tjsrae.15-12_OA

CiNii Article

J-GLOBAL

researchmap

Energy Efficiency of SR and IPM Generators for Hybrid Electric Vehicle 査読

Urase Katsuhiko, Yabu Noboru, Kiyota Kyohei, Sugimoto Hiroya, Chiba Akira, Takemoto Masatsugu, Ogasawara Satoshi, Hoshi Nobukazu

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 51 ( 4 ) 2874 - 2883 2015年7月

受動磁気軸受を活用する5軸能動制御形ベアリングレスキャンドモータポンプの小型・低損失化の検討査読

宮本和弥, 竹本真紹, 小笠原悟司, 平櫛真男

日本AEM学会誌 23 ( 2 ) 250 - 257 2015年6月

A basic study of a novel homopolar type magnetic bearing unifying four C-shaped cores for high output and low loss 査読

T. Matsuzaki, M. Takemoto, S. Ogasawara, K. Nishihama, D. Kori, K. Nagata

2015 IEEE Magnetics Conference (INTERMAG) 2015年5月

Development of a Rare-Earth-Free SR Motor With High Torque Density for Hybrid Vehicles 査読

Chiba Akira, Kiyota Kyohei, Hoshi Nobukazu, Takemoto Masatsugu, Ogasawara Satoshi

IEEE TRANSACTIONS ON ENERGY CONVERSION 30 ( 1 ) 175 - 182 2015年3月

Operational Characteristics of an IPM-type Bearingless Motor with 2-pole Motor Windings and 4-pole Suspension Windings 査読

Tatsuya Matsuzaki, Masatsugu Takemoto, Satoshi Ogasawara, Satoru Ota, Kazunobu Oi, Daiki Matsuhashi

2015 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 3886 - 3894 2015年

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：IEEE

A bearingless motor (BelM) integrates the characteristics of an electric motor and a magnetic bearing. Typically, a surface-mounted permanent magnet (SPM)-type BelM with a ring magnet magnetized in parallel is employed for high-speed operation. It is noteworthy that a carbon fiber bandage is needed to fix the ring magnet. However, when an SPM-type BelM is applied to a high-output motor, it becomes difficult to generate sufficient suspension force because of the wide magnetic gap arising from the carbon fiber bandage and the ring magnet. In addition, the manufacturing cost for the large-scale ring magnet and the carbon fiber bandage is high. Therefore, to realize a high-output and high-speed BelM at a low cost, we have focused on an interior permanent magnet (IPM)-type BelM with 2-pole motor windings and 4-pole suspension windings. Moreover, a rotor structure for suppressing suspension force ripple arising in the IPM-type BelM has been proposed based on three-dimensional finite element analysis. In this study, a prototype of the IPM-type BelM with the proposed rotor structure is produced. Experiments with this prototype show that the proposed rotor structure is effective in reducing suspension-force ripple. Additionally, the operational characteristics of the prototype are shown in detail.

Web of Science

researchmap

A Control Method for Three-Phase to High-Frequency Single-Phase Matrix Converter Based on Instantaneous Input Voltages 査読

Agnes Hadinata, Satoshi Ogasawara, Masatsugu Takemoto, Takashi Hyodo

2015 IEEE 2ND INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC) 2015年

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：IEEE

This paper proposes a new control method for three-phase to high-frequency single-phase matrix converter (MC) based on instantaneous input voltages. Direct conversion of AC input power to AC output power by MC resulting in higher conversion efficiency, longer lifespan, and more compact size compared to the conventional method by using PWM rectifier and PWM inverter. The proposed MC can produce high frequency output equal to its power devices' switching frequency. The feature of the proposed control method is its sophisticated calculation based on instantaneous input voltages, producing unity input power factor and regulating the output voltage according to the reference value at any instant. Some simulation and experiment results are shown to prove the validity and effectiveness of the proposed method.

Web of Science

researchmap

Examination to Make Eddy Current Loss Density Uniform in Divided Nd-Fe-B Magnets of a High Torque Density Motor with Axial-gap Structure 査読

Ayato Nihonyanagi, Masatsugu Takemoto, Satoshi Ogasawara, Koji Inoue

2015 IEEE 2ND INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC) 2015年

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：IEEE

An axial-gap motor with Nd-Fe-B magnets was examined by three-dimensional finite element analysis (3D-FEA) in order to achieve high torque density over 66.8 Nm/L under the constraint of a maximum current density of 12 A/mm(2), and it was confirmed that the examined motor could satisfy these conditions. In this examination, suppressing eddy current loss occurring in these magnets by equally dividing a magnet constituting one pole toward radial direction was attempted. However, 3D-FEA results revealed that the eddy current loss density generated in each magnet which was equally divided was not uniform and had a large bias. So, this paper provides examination to make the eddy current loss density uniform in divided magnets by adjusting split width appropriately.

Web of Science

researchmap

Examination of an Axial-gap Generator with Ferrite Permanent Magnets Realizing Miniaturization and High Output Power of Engine Generators 査読

Ayato Nihonyanagi, Masatsugu Takemoto, Satoshi Ogasawara

2015 IEEE INTERNATIONAL ELECTRIC MACHINES & DRIVES CONFERENCE (IEMDC) 300 - 307 2015年

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：IEEE

In general engine generators, the engine and generator are separate units connected by a mechanical coupling. This tends to increase the package size of general engine generators. In this paper, we are able to achieve miniaturization and high output power of the generator by adopting an axial-gap structure through using ferrite permanent magnets. At the same time, the package size is reduced dramatically by integrating the axial-gap generator into the engine. This paper also discusses methods for reducing the eddy current losses that occur in the windings due to the open-slot structure of the stator core and occur in the rotor support component. By using results from three-dimensional finite element analysis, we show that the eddy current loss that occurs in the windings is reduced by using appropriate methods to wind the coils with rectangular wires. In addition, the eddy current loss that occurs in the rotor support component is decreased by appropriately selecting the material and changing the shape of the component. Experimental results show that the studied structure is effective for realizing miniaturization and high output power of the generator, as well as for decreasing the package size of the engine generator.

Web of Science

researchmap

Rotor Design of a 150kW 6,000rpm/25,000rpm High speed Induction Motor for Testing Equipment of EV/HEV traction motors 査読

Takafumi Nagaoka, Masatsugu Takemoto, Satoshi Ogasawara

2015 18TH INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS) 163 - 168 2015年

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：IEEE

Recent models of hybrid vehicles and electric vehicles include traction motors with increasing capacity for rotation speed. Therefore, high-speed testing equipment suitable for use with traction motors and motor components is required in automotive research and development. Induction motors (IMs) with oil-cooling are suitable motors for testing equipment. Solutions for some drawbacks of high-speed IMs will be proposed in this paper. Also, several solutions, such as high-tension magnet steel and transitional analysis via finite element modeling, will be introduced. Test reports are shown for rotation speeds of up to 23,000 rpm.

Web of Science

researchmap

Development of frequency-analysis equipment capable of judging propagation direction of conductive EMI 査読

Noriyuki Nosaka, Satoshi Ogasawara, Masatsugu Takemoto, Yoshitaka Iwaji, Kazutoshi Ogawa

2014 IEEE Energy Conversion Congress and Exposition (ECCE) 2014年9月

A Novel Magnet Polarity Identification Method for Initial Position Estimation for Sensorless IPMSM Drive 査読

Minglei Gu, Satoshi Ogasawara, Masatsugu Takemoto

IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING 9 ( 4 ) 434 - 441 2014年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY-BLACKWELL

This paper proposes a novel magnet polarity identification method for initial position estimation during startup for interior permanent magnet synchronous machine (IPMSM) drives. The rotor's initial position estimation is based on magnetic saliency and employs high-frequency (HF) components of the voltage and current that are excited by the multi space-vector pulse-width modulation (MSVPWM) pattern. However, there is a common trouble in the estimation methods based on the magnetic saliency: it is necessary to identify the magnet polarity in order to distinguish the north and south poles since the estimated position angle is a periodic function with p radians. In this paper, a novel inductance estimation method is presented and the magnet polarity is uniquely identified by the relationship between the estimated inductance and the magnetic saturation effect. Experimental results confirm the advantages of the proposed method: it is reliable, accurate, and convenient, and can be done in real time. (C) 2014 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

DOI： 10.1002/tee.21990

Web of Science

researchmap

Developments of Ferrite PM In-Wheel Motors with Axial-Gap Structure for Electric City Commuters 査読

M. Takemoto, K. Sone, S. Ogasawara, W. Hino, K. Takezaki

the EVTeC 2014 & APE Japan ( 20144075 ) 2014年5月

Sensorless IPMSM position estimation based on multi SVPWM with elimination of inverter nonlinear effects 査読

Minglei Gu, Satoshi Ogasawara, Masatsugu Takemoto

IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING 9 ( 2 ) 219 - 227 2014年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY-BLACKWELL

This paper presents a position-sensorless interior permanent magnet synchronous motor (IPMSM) control system at low and zero speed based on a multi-space-vector pulse-width modulation (MSVPWM) pattern with the elimination of nonlinear inverter effects. In conventional sensorless methods based on the MSVPWM pattern, the high-frequency (HF) components of voltage and current are used to estimate the rotor position information. However, the inverter nonlinear effects, such as forward voltage drops and deadtime, distort the HF components of the voltage and current so that an error occurs in the position estimation. Therefore, an improved position estimation scheme is developed in this paper. The compensated HF components of the voltage taking account of the inverter nonlinear effects can be used to decrease the estimation error. The proposed method can be implemented without increasing any hardware cost. Experimental results confirm the effectiveness of the proposed method. (c) 2014 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

DOI： 10.1002/tee.21959

Web of Science

researchmap

Examination for the Higher Efficiency in a Ferrite Permanent Magnet 10 kW In-Wheel Axial-Gap Motor with Coreless Rotor Structure 査読

Kodai Sone, Masatsugu Takemoto, Satoshi Ogasawara, Kenichi Takezaki, Wataru Hino

2014 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 5885 - 5892 2014年

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：IEEE

Powerful rare earth permanent magnets (PMs) are generally utilized in in-wheel PM synchronous motors for electric city commuters. However, the use of rare earth PMs has become undesirable due to high prices. An in-wheel PM synchronous motor that does not employ rare earth PMs therefore needs to be developed. We have previously proposed an in-wheel axial-gap motor that can generate high torque density and has features such as a coreless rotor structure with ferrite PMs and a reduction gearbox inside the stator. Through further research, we confirmed that suppression of eddy current loss arising in the rotor is important for attaining higher efficiency in high output motors. Accordingly, here we introduce an improved rotor with slits which can suppress eddy current loss. The results of experiments on a new prototype show that the improved rotor is effective in producing high efficiency and can satisfy the properties demanded of the in-wheel motors for electric city commuters.

Web of Science

researchmap

Development of a High-Frequency Space Vector Pulse Width Modulated Inverter with an Active Common-Noise Canceler 査読

Masashi Ogawa, Satoshi Ogasawara, Masatsugu Takemoto

2014 IEEE 36TH INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE (INTELEC) 2014年

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：IEEE

This paper proposes a new circuit configuration of the active common-noise canceler (ACC), which is used to reduce electromagnetic interference of a space vector modulation (SVPWM) inverter. The original ACC, which was proposed by the authors, cancels all components of the common-mode voltage and, therefore, cannot be used in an SVPWM inverter owing to the low-frequency component of the common-mode (zero-sequence) voltage. The proposed ACC cancels only the high-frequency component of the common-mode voltage so it can be used in SVPWM inverters. Furthermore, the high-frequency carrier makes a large contribution to downsizing the common-mode transformer. To confirm the suitability and usefulness of the proposed ACC, an experimental system including a 100-kHz SVPWM inverter was constructed and tested. The experimental results show that the proposed ACC can reduce the high-frequency component of the common-mode voltage.

Web of Science

researchmap

　前のページ - 次のページ　

<竹本 真紹>

論文 - 竹本 真紹

<竹本　真紹>

論文 - 竹本　真紹