Faculty Profiles - TAKEMOTO Masatsugu

Papers - TAKEMOTO Masatsugu

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

K. Izumiya, R. Tsunata, M. Takemoto, J. Imai, T. Saito, T. Ueno

2022 International Conference on Electrical Machines (ICEM) 2022.9

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

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

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 58 ( 3 ) 3470 - 3485 2022.5

Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

In recent years, there has been growing demand for flat electrical machines in order to minimize system size while also maintaining high efficiency. In general, axial flux machines (AFMs) are more suitable for flat form than radial flux machines (RFMs). AFMs usually employ a soft magnetic composite (SMC) for the stator core, and their efficiency can be improved by employing an SMC that has low iron loss. However, this reduces the average torque because there is generally a tradeoff relationship between iron loss and magnetic permeability in SMCs. This article, therefore, proposes an AFM with a coreless rotor structure in which the torque performance is not easily affected by the permeability of the SMC. This article aims to reveal the ideal SMC characteristics for high efficiency in AFMs. First, many virtual SMC materials with different iron loss and permeability are used for simulations of AFMs in order to investigate sensitivity to material properties. The simulations by virtual SMCs take into account the experimental increase in the iron loss. As a result, guidelines for developing SMCs are constructed based on the experimental results. Finally, prototype AFMs employing new SMCs developed by following the guidelines are shown, and it is found that they offer higher efficiency in all operating area than conventional AFMs. In particular, one prototype achieves an extremely high efficiency of over 96% at 6000 r/min, 0.8 Nm in experiments.

DOI： 10.1109/TIA.2022.3154336

Web of Science

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On loop-shaping controller synthesis for a flexible slewing arm with tip accelerometer Reviewed

J. Imai, K. Inoue, M. Takemoto

the 13th Asian Control Conference (ASCC 2022) 1262 - 1263 2022.5

Common Mode Noise Suppression Control for Two-Motor Drive Systems Reviewed

141 ( 11 ) 895 - 902 2021.11

Examination for a Hybrid Excitation Motor with Reverse Saliency while Having a Field Winding on a Rotor Reviewed

Ryusyo Nakazawa, Masatsugu Takemoto, Satoshi Ogasawara, Koji Orikawa

2021 IEEE Energy Conversion Congress and Exposition (ECCE) 3767 - 3774 2021.10

Conductive-Noise Suppression Control Improved by Synchronous Compensation for Switching Reviewed

埴岡翔太, 家澤雅宏, 小笠原悟司, 竹本真紹, 折川幸司, 小原峻介

電気学会論文誌 D 141 ( 9 ) 683 - 691 2021.9

Development of a Consequent-Pole-PM-Type Axial-Gap Motor With DC Field Winding Reviewed

Tomohira Takahashi, Masatsugu Takemoto, Satoshi Ogasawara, Toru Ogawa, Hideaki Arita, Akihiro Daikoku

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 57 ( 5 ) 4363 - 4375 2021.9

Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Permanent magnet synchronous motors for electric vehicles should meet three criteria: high maximum torque, high efficiency at low torque, and constant output in a wide speed range. However, meeting these criteria has come with a trade-off in terms of the magnitude of the field magnetic flux. We propose a consequent-pole-PM-type axial-gap motor with ferrite PMs and field windings, which has structure variable field magnetic flux. In order to examine the operational characteristics of the proposed motor, we produced and tested a prototype. Experimental results show that the proposed structure meets all of the three criteria above.

DOI： 10.1109/TIA.2021.3084549

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

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Koji Orikawa

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 57 ( 4 ) 3545 - 3561 2021.7

Language：English Publishing type：Research paper (scientific journal) Publisher：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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Experimental evaluation of the relationship between dimensional dependencies of MnZn ferrites and filter inductor impedances

Shotaro Takahashi, Satoshi Ogasawara, Masatsugu Takemoto, Koji Orikawa, Michio Tamate

ELECTRICAL ENGINEERING IN JAPAN 214 ( 2 ) 2021.6

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY

This study investigates the relationship between filter inductor impedance and dimensional resonance of MnZn ferrite. Experimental results clarify that multiple factors affect inductor impedance resonances. These can be classified into three factors: the inherent characteristics of a magnetic material, self-resonance due to winding stray capacitance, and winding that acts as a distributed constant line. Next, based on the measurement results, the dimensional dependencies of complex permeabilities (dimensional resonance) and the influence of dimensional resonance on inductor impedance are discussed in detail. Finally, this study verifies that the influence of dimensional resonance on complex permeability can be mitigated, and filter inductor impedance can be increased in the high frequency range by core lamination. All experiments are performed using off-the-shelf magnetic core products.

DOI： 10.1002/eej.23302

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An active common-noise canceler combined with feedback control

Shunsuke Ohara, Satoshi Ogasawara, Masatsugu Takemoto, Koji Orikawa, Yushin Yamamoto

ELECTRONICS AND COMMUNICATIONS IN JAPAN 104 ( 2 ) 2021.6

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY

This paper describes the methods for improving the performance of an active common-noise canceler (ACC) that suppresses the common-mode (CM) voltage generated by inverters. Whereas the already proposed ACC (ACC0) compatible with space vector pulse width modulation requires two emitter follower circuits, this paper proposes an improved ACC (ACC1) that requires a single emitter follower. In addition, an ACC (ACC2) that improves the CM voltage suppression performance by adding a feedback circuit to ACC1 is also proposed. The experimental results show that ACC1 improved the CM voltage attenuation by -10 dB compared to ACC0, and ACC2 improved the CM voltage attenuation by -20 dB compared to ACC1. ACC2 has a large CM voltage attenuation of up to -53 dB in the wide frequency range from 100 kHz to 5 MHz.

DOI： 10.1002/ecj.12305

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

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

2021 IEEE International Electric Machines & Drives Conference (IEMDC) 1 - 8 2021.5

Publishing type：Research paper (international conference proceedings) Publisher：IEEE

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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Vibration Control with Phase Compensation of Tip Acceleration in a Flexible Slewing Arm Reviewed

出射治, 今井純, 高橋明子, 竹本真紹

計測自動制御学会論文集 57 ( 5 ) 2021

An Active Common-noise Canceler Combined with Feedback Control Reviewed

小原峻介, 小笠原悟司, 竹本真紹, 折川幸司, 山本融真

電気学会論文誌 D 141 ( 1 ) 2021

A 2.5 MHz High-Frequency Output Inverter Based on Frequency Multiplying Technique with a Multi-Core Transformer using Mn-Zn Ferrite Materials Reviewed

Koji Orikawa, Satoshi Ogasawara, Masatsugu Takemoto, Jun-ichi Itoh

IEEJ JOURNAL OF INDUSTRY APPLICATIONS 10 ( 3 ) 370 - 376 2021

Language：English Publishing type：Research paper (scientific journal) Publisher：INST ELECTRICAL ENGINEERS JAPAN

This paper proposes a 2.5 MHz high-frequency output inverter based on a frequency multiplying technique with a multi-core transformer using Mn-Zn ferrite materials. The upper limit of the operation frequency for these materials is lower than the output frequency of 2.5 MHz. First, the operation principle of the proposed circuit is explained. Second, a difficulty of using Mn-Zn for transformers at the frequency of 2.5 MHz is discussed. Third, a numerical analysis shows that the proposed circuit can output the frequency over the upper limit of the operation frequency of Mn-Zn ferrite. Finally, through continuous operation, where the proposed circuit outputs approximately 650 W, it is experimentally confirmed that Mn-Zn ferrite can be used without large iron loss at the output frequency of 2.5 MHz. Thus, the proposed circuit can overcome the difficulty of using Mn-Zn for transformers at the frequency of 2.5 MHz.

DOI： 10.1541/ieejjia.20010411

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Examination of Enhancing Efficiency of Axial Gap Motor in High Speed and High Torque Region by Adopting Neodymium Bonded Magnet Reviewed

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

IEEJ JOURNAL OF INDUSTRY APPLICATIONS 10 ( 4 ) 487 - 496 2021

Language：English Publishing type：Research paper (scientific journal) Publisher：INST ELECTRICAL ENGINEERS JAPAN

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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Selection of Rotor Retaining Sleeve Considering Loss Density and Prototype Machine Operating Characteristics in 2-pole Ultra-High-Speed Motors Reviewed

飯田貴之, 竹本真紹, 小笠原悟司, 折川幸司, 佐藤以久也, 國分博之, 鳥羽章夫, 首藤雅夫

電気学会論文誌 D 141 ( 6 ) 2021

Balance Torque Control for Vibration Suppression and Energy Saving Reviewed

鈴木尚礼, 田村建司, 奥山敦, 能登原保夫, 竹本真紹, 小笠原悟司

電気学会論文誌 D 141 ( 7 ) 2021

Examination of Magnet-Less 3-Axis Magnetic Bearing with Cylindrical Rotor Reviewed

SUN Hao, 竹本真紹, 小笠原悟司

日本AEM学会誌 29 ( 1 ) 2021

Reduction in Eddy Current Loss of Concentrated Windings in High-power Density IPMSM Using Rectangular Windings Reviewed

Shinnosuke Kajii, Masatsugu Takemoto, Takehiro Jikumaru, Fuminori Suzuki, Satoshi Ogasawara, Koji Orikawa

2021 22ND IEEE INTERNATIONAL CONFERENCE ON INDUSTRIAL TECHNOLOGY (ICIT) 221 - 227 2021

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

Researches on more electric aircraft (MEA) are actively conducted. It is necessary for realizing MEA to meet aircraft application requirements: high ability, high availability, and high-power density, while aiming to reduce weight and environmental impact. For example, interior permanent magnet synchronous motors (IPMSMs) are expected to be used for aircraft applications of MEA, because IPMSMs can achieve both high-power density and high efficiency at high speed and high torque area compared to other types such as induction motors. In general, IPMSMs with concentrated winding structure are available to utilize limited space effectively. Rectangular windings allow high winding factor and realizing more high-power density motors, whereas eddy current loss in rectangular windings is much higher than that in round windings. In this paper, high-power density concentrated winding IPMSMs that employ rectangular windings are discussed. We have examined three improvements for a reduction of the eddy current loss in the rectangular windings to attain continuous operation with high-power density in this motor. In order to reduce the eddy current loss in the windings situated in front of the rotor, we adopted an asymmetric toot-htip. Moreover, an adequate groove shape between tooth and stator yoke allows to reduce the eddy current loss in stator yoke side windings. Windings, which have optimized unequal cross-sectional area, offer to reduce whole winding loss. Finally, we present a proposed motor employing the three improvements.

DOI： 10.1109/ICIT46573.2021.9453692

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High Frequency Transformers with Adjustable Leakage Inductance using Wire Guides Reviewed

Ryohei Shintai, Koji Orikawa, Satoshi Ogasawara, Masatsugu Takemoto

23rd International Conference on Electrical Machines and Systems, ICEMS 2020 1547 - 1552 2020.11

Language：English Publishing type：Research paper (international conference proceedings)

High frequency transformers are used for isolated power converters such as LLC resonant converters since a leakage inductance of the transformer can be utilized as a part of a resonant inductance in addition to electrical isolation. In order to perform ZVS, the leakage inductance of a transformer is designed so that the current phase flowing in switching devices and Q factor of the resonant circuit are appropriate values. However, it is usually difficult to fabricate properly windings, while managing the leakage inductance precisely. In addition, it is necessary to suppress the stray capacitance which flows leading phase current to switching devices. This paper proposes a high frequency transformer with an adjustable leakage inductance and stray capacitance by only changing the thickness and height of the wire guides.

DOI： 10.23919/ICEMS50442.2020.9291023

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Papers - TAKEMOTO Masatsugu