論文 - 小坂 卓
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Windage loss reduction for hybrid excitation flux switching motors based on rotor structure design 査読あり 国際誌
Yasuhiro Okada, Takashi Kosaka, Nobuyuki Matsui
Proc of 2017 IEEE International Conference on Electric Machines and Drives Conference (IEMDC) 1 - 8 2017年05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） 出版者・発行元：IInstitute of Electrical and Electronics Engineers
This paper presents design study on windage loss reduction for hybrid excitation flux switching motor employing two types of rotor structure. Conventional flux switching motors have a rotor structure with salient poles, by which windage loss at high speed region becomes serious. To reduce the windage loss, two types rotor are built: One is a cylindrical rotor employing iron rib between adjacent salient poles and shrouds placed at both ends in axial direction of rotor body and, the other is only employing the shrouds. Experimental tests using two machines combining with an existing stator and two rotors are conducted. As a result, the rotor with only the shrouds can greatly reduce the windage loss while keeping the maximum torque and power, and motor efficiency at high speed region as it is. From a viewpoint of windage loss reduction, different rotor configurations with and without the shroud are investigated by 3D-FEA based fluid analyses and discussed.
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自動車用高効率ハイブリッド界磁モータの運転特性 査読あり
小坂 卓, 尾関 慧, 松井 信行
日本AEM学会誌 24 ( 3 ) 246 - 251 2016年09月
担当区分：筆頭著者 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
本論文では，比較対象機を2010年に米国で発売されたプリウス搭載のIPMSM[4]とする。その性能仕様である最大トルク207Nm－最大出力60kW－最高回転数13,500r/minを目標性能仕様とし，3D-FEAを用いて提案HEMの設計を行っている。目標仕様を達成する設計形状（初期設計形状）に対し，解析性能評価結果と試作製造制約を考慮した試作設計形状での変更点がモータ性能に与える影響を3D-FEAを用いて考察している。試作設計形状に基づいて製作した提案HEMの実験による性能評価試験結果を報告する。
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Experimental Study on Windage Loss Reduction using Two Types of Rotor for Hybrid Excitation Flux Switching Motor 査読あり 国際誌
Hiroki Nakane, Yasuhiro Okada, Takashi Kosaka and Nobuyuki Matsui
Proc. of 2016 XXII International Conference on Electrical Machines (ICEM) 1707 - 1713 2016年09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） 出版者・発行元：Institute of Electrical and Electronic Engineers
This paper presents experimental studies on windage loss reduction using two types rotor for hybrid excitation flux switching motor that is intentionally designed so as to compete with an interior permanent magnet synchronous motor installed on TOYOTA PRIUS-2010. This machine makes it possible to vary its field flux by combining the two different mmf sources such as field excitation coils and permanent magnets. Generally, as hybrid excitation flux switching motors have a rotor with salient pole structure like a switched reluctance motor, a large amount of windage loss at high speed region damages motor efficiency. In this paper, two types of rotor, one with cylindrical shape and the other with covered by only shroud located at both axial end of rotor core are built and tested. Compare with a conventional salient pole rotor, it is found that the rotor with only shroud can dramatically reduce windage loss while keeping other drive performances as it is.
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Three-phase variable flux outer-rotor switched flux permanent magnet machine 査読あり 国際誌
M. Z. Ahmad, E. Sulaimanm, G. M. Romalan, M. Jenal, T. Kosaka
Proc. of 2016 XXII International Conference on Electrical Machines (ICEM) 2563 - 2569 2016年09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） 出版者・発行元：Institute of Electrical and Electronic Engineers
High torque density and robust rotor structure outer-rotor switched flux permanent magnet (SFPM) machine with DC excitation is proposed for emerging candidates to replace conventional electric motor of direct drive electric vehicle (EV). The extraordinary of DC excitation coil provides higher generated flux and flux control capability that suitable for various operating conditions. With the concept of motor housing inside the wheel, mechanical transmission as conventionally applied in centralized drive can be eliminated. In this paper, the proposed machine operating principle, predicted back electromagnetic force, cogging torque and torque production based on 2D-FEA are validated experimentally on the developed prototype. The results obtained show that there is good agreement between 2D-FEA and experiments.
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Design Studies on Hybrid Excitation Flux Switching Motor with High Power and Torque Densities for HEV Applications 査読あり 国際誌
Yuya Maeda, Takashi Kosaka and Nobuyuki Matsui
Proc. of 2016 XXII International Conference on Electrical Machines (ICEM) 2522 - 2528 2016年09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） 出版者・発行元：Institute of Electrical and Electronic Engineers
This paper presents design studies on hybrid excitation flux switching motor (HEFSM) that can compete with an interior permanent magnet synchronous motor (IPMSM) installed on TOYOTA PRIUS-2010. A stator of the HEFSM consists of not only laminated core and three-phase armature windings, but also field excitation coils and permanent magnets as field mmf sources. This machine makes it possible to vary its field flux by combining the two different mmf sources and thus, the name is capped by “hybrid excitation” as a variable field flux motor. The first trial manufacturing of HEFSM has been built for tests to assess its drive performances. Based on analysis of the test results, design refinements on the first test motor are ex-amined to make the second trial manufacturing. Various ex-perimental test results using the second test motor demon-strate that drive performances of the HEFSM are comparable to those of the PRIUS’s IPMSM.
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Digital PWM Control-Based Active Vibration Cancellation for Switched Reluctance Motors 査読あり 国際誌
Hiroaki Makino, Takashi Kosaka, Nobuyuki Matsui
IEEE Transactions on Industry Applications 51 ( 6 ) 4521 - 4530 2015年11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：IEEE
This paper presents a study on a control strategy for active vibration cancellation (AVC) and noise reduction in switched reluctance (SR) motors. It has been revealed that two-stage commutation control based on the natural frequency of the stator body has been effective in suppressing the vibration occurring on the stator body at the commutation. According to some considerations on the generation mechanism of the vibration, a new AVC control for variable-speed SR motor drives under digital PWM control is proposed. Experimental studies using a 12-kW three-phase 12/8 SR motor demonstrate that the proposed two-step commutation control using negative voltage PWM is much effective as an AVC and noise reduction technique. Moreover, the proposed control is evaluated from the viewpoints of drive performances such as torque ripple and copper loss.
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HEV用位置センサレス駆動集中巻IPMSMの最大トルク向上設計 査読あり
加納 善明，小坂 卓，松井 信行
電気学会論文誌Ｄ（産業応用部門誌） 135 ( 9 ) 929 - 938 2015年09月
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：電気学会
その他リンク： https://www.jstage.jst.go.jp/article/ieejias/135/9/135_929/_article/-char/ja/
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HEV駆動用WFFSMの界磁巻線電流増加による高出力化メカニズムの実験検証 査読あり
桑原 優，小坂 卓， 鎌田 義信， 梶浦 裕章，松井 信行
電気学会論文誌Ｄ（産業応用部門誌） 135 ( 9 ) 939 - 947 2015年09月
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：電気学会
その他リンク： https://www.jstage.jst.go.jp/article/ieejias/135/9/135_939/_article/-char/ja/
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新しいフラックスバリア形状による位置センサレス駆動集中巻 IPMSM のトルク脈動低減設計 査読あり
加納 善明, 小坂 卓, 松井 信行, 中西 俊人
電気学会論文誌D 135 ( 6 ) 725 - 733 2015年06月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
This paper presents a torque ripple reduction design of a concentrated-winding IPMSM with a new flux barrier for saliencybased
sensorless drives. The proposed IPMSM is designed for use in general-purpose sensorless industrial drives. In order to reduce
torque ripple, its rotor employs a V-shape-magnet arrangement and circular flux barrier which is placed at the center of a rotor yoke
between N- and S-poles. A 45-Nm 5.5-kW IPMSM is manufactured as a prototype in order to confirm the design validity, and
experimental studies using the prototype demonstrate the expected drive characteristics and validate the proposed design procedure.その他リンク： https://www.jstage.jst.go.jp/browse/ieejias/-char/ja
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産業サーボドライブ用四相ＳＲモータの瞬時電流波形制御 査読あり
牧野 宏明, 小坂 卓, 森本 進也, 大戸 基道, 松井 信行
電気学会論文誌D 135 ( 6 ) 711 - 717 2015年06月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
This paper presents an instantaneous current profile control of a four-phase switched reluctance (SR) motor for servo drive applications. Generally, a positioning controller for servo drives has torque and adjustable speed regulators as its inner loop. The proposed instantaneous current controller works as the torque regulator of the SR motor under low speed range less than 10% of rated speed on the assumption that it switches to or from different torque regulator beyond or within the threshold speed. It enables to suppress inherent torque ripple of SR motor and employs voltage PWM control with fixed switching frequency for tracking the instantaneous current profile with respect to given torque reference. Experimental studies using a 400W SR motor with four-phase 8/6 configuration demonstrates the effectiveness of the proposed instantaneous current profile controller as the inner loop of positioning controller for servo drives.
その他リンク： https://www.jstage.jst.go.jp/browse/ieejias/-char/ja
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Control of Wound Field Synchronous Motor Integrated with ZSI 査読あり
27. G. Tajima, T. Kosaka, N. Matsui, K. Tonogi, N. Minoshima, T. Yoshida
IEEJ Journal of Industry Applications 4 ( 3 ) 196 - 203 2015年05月
記述言語：英語 掲載種別：研究論文（学術雑誌）
This paper proposes a novel variable speed motor drive, wound field synchronous motor (WFSM) drive integrated with Z-source inverter (ZSI). The proposed WFSM is non-permanent magnet machine and employs two field coils as dc field mmf sources. On the other hand, ZSI has an impedance-network which is composed of two dc reactors and two capacitors. In the proposed drive, the two field coils of WFSM act not only as dc field mmf sources, but also as dc reactors in ZSI, resulting in size and cost reductions of the drive system. In order to achieve both the voltage boost-up and the field current controls simultaneously, its control algorithm is examined. Experimental results using a test drive system show that the proposed drive under the proposed control works properly.
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Design Studies on Hybrid Excitation Flux Switching Motor with High Power and Torque Densities for HEV Applications 査読あり
Hiroki Nakane, Takashi Kosaka, Nobuyuki Matsui
Proc. of the 2015 IEEE International Electric Machines and Drives Conference(IEMDC) 234 - 239 2015年05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）
This paper presents design studies on hybrid excitation flux switching motor (HEFSM) that can compete with an interior permanent magnet synchronous motor (IPMSM) installed on TOYOTA PRIUS-2010. A stator of the HEFSM consists of not only laminated core and three-phase armature windings, but also field excitation coils and permanent magnets as field mmf sources. This machine makes it possible to vary its field flux by combining the two different mmf sources and thus, the name is capped by “hybrid excitation” as a variable field flux motor. The first trial manufacturing of HEFSM has been built for tests to assess its drive performances. Based on analysis of the test results, design refinements on the first test motor are ex-amined to make the second trial manufacturing. Various ex-perimental test results using the second test motor demon-strate that drive performances of the HEFSM are comparable to those of the PRIUS’s IPMSM.
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Experimental Studies on Drive Performances of Wound Field Synchronous Motor Drive Integrated with ZSI "jointly worked" 査読あり
Genki Tajima, Takashi Kosaka and Nobuyuki Matsui
Conference Proceedings of Thirtieth Annual IEEE Applied Power Electronics Conference and Exposition 262 - 269 2015年03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）
This paper presents experimental studies on drive
performances of wound field synchronous motor (WFSM)
integrated with Z-source inverter (ZSI) system. WFSM is a nonpermanent
magnet machine and employs two field coils as dc
field mmf sources. The conventional WFSM drive uses a three
phase inverter for the armature windings and a dc chopper for
the field coils, separately. On the other hand, ZSI works as a
three phase inverter with a function of dc voltage boost-up by
using an impedance-network inserted between the DC-bus and
the three phase inverter. The impedance-network consists of two
dc reactors and two capacitors. The “integrated” means that in
the proposed drive system, two field coils of WFSM are employed
not only as dc field mmf sources for the motor, but also as dc
reactors for the impedance-network. Thus, the proposed system
eliminates the use of DC chopper, resulting in size and cost
reductions as the total drive system. The comparison of operable
range between the conventional system and the proposed system
through various experimental studies using a test drive system is
demonstrated and discussed. -
Operation Evaluations in High Speed Range of Wound Field Synchronous Motor Drive Integrated with ZSI "jointly worked" 査読あり
G. Tajima, T. Kosaka and N. Matsui, K. Tonogi, N. Minoshima and T. Yoshida
Proceedings of the 2015 IEEE International Conference on Mechatronics (ICM) 681 - 686 2015年03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）
This paper presents experimental evaluations of
drive performances in high-speed range of a wound field
synchronous motor (WFSM) drive system integrated with a zsource
inverter (ZSI). The WFSM has two field coils as DC field
mmf sources instead of permanent magnets. On the other hand,
the ZSI employs an impedance-network that consists of two DC
reactors and two capacitors. A uniqueness of the proposed drive
system lies in that this system makes it possible to reduce size and
cost because the two DC reactors serve as both two field coils as
the DC field mmf sources in the WFSM and the DC boosting
reactors in the ZSI. The comparisons of drive performances in
high-speed range between the proposed integrated system and a
non-integrated system are experimentally demonstrated and
discussed. -
Active Vibration Reduction based on Digital PWM Control for SR Motors 査読あり
H. Makino, T. Kosaka and N. Matsui
Proc. of the 2014 International Conference on Electrical Machines (ICEM2014) 679 - 685 2014年09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）
This paper presents a study on control strategy for active vibration cancellation and noise reduction in SR motor. It has been revealed that 2-stage commutation control based on natural frequency of stator body has been effective to suppress the vibration occurring on the stator body. According to some considerations on generation mechanism of the vibration, a new active vibration cancellation control for variable speed SR motor drive under digital PWM control is proposed. Experimental studies using 12kW three-phase 12/8 SR motor demonstrates that the proposed 2-step commutation control using negative voltage PWM is much effective as active vibration cancellation and noise reduction technique.
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Didital PWM Control-Based Active Vibration Cancellation for Switched Reluctance Motors 査読あり
H. Makino, T. Kosaka and N. Matsui
Proc. of the sixth IEEE ENERGY CONVERSION CONGRESS & EXPOSITION (ECCE2014) 3834 - 3841 2014年09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）
This paper presents a study on control strategy for active vibration cancellation and noise reduction in SR motor. It has been revealed that 2-stage commutation control based on natural frequency of stator body has been effective to suppress the vibration occurring on the stator body at the commutation. According to some considerations on generation mechanism of the vibration, a new active vibration cancellation control for variable speed SR motor drive under digital PWM control is proposed. Experimental studies using 12kW three-phase 12/8 SR motor demonstrates that the proposed 2-step commutation control using negative voltage PWM is much effective as active vibration cancellation and noise reduction technique. Moreover, the proposed control is evaluated from the viewpoints of drive performances such as torque ripple and copper loss.
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Recent technical trends in PMSM 査読あり
S. Morimoto, Y. Asano, T. Kosaka and Y. Enomoto
Proc. of the 2014 International Power Electronics Conference –ECCE ASIA- (IPEC-Hiroshima2014) 1997 - 2003 2014年05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）
This paper overviews the recent technical trends in permanent magnet synchronous motors (PMSMs), especially the rare-earth less PMSMs in Japan. The rareearth less PMSMs including the PMSMs with reduced rareearth PMs, permanent magnet assisted synchronous motors with ferrite magnets and axial gap PMSMs with ferrite magnets are reviewed.
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Control of Wound Field Synchronous Motor Integrated with ZSI 査読あり
G. Tajima, T. Kosaka, N. Matsui, K. Tonogi, N. Minoshima and T. Yoshida
Proc. of the 2014 International Power Electronics Conference –ECCE ASIA- (IPEC-Hiroshima2014) 2438 - 2444 2014年05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）
This paper proposes a novel variable speed motor drive, wound field synchronous motor (WFSM) drive integrated with Z-source inverter (ZSI). The proposed WFSM is non-permanent magnet machine and employs two field coils as dc field mmf sources. On the other hand, ZSI has an impedance-network which is composed of two dc reactors and two capacitors. In the proposed drive, the two field coils of WFSM act not only as dc field mmf sources, but also as dc reactors in ZSI, resulting in size and cost reductions of the drive system. In order to achieve both the voltage boost-up and the field current controls simultaneously, its control algorithm is examined. Simulation and experimental results show that the proposed drive under the proposed control works properly.
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Control Performance Comparisons among Three Types of Instantaneous Current Profiling Technique for SR Motor 査読あり
H. Makino, T. Kosaka and N. Matsui
Proc. of the 7th IET International Conference on Power Electronics, Machines and Drives (PEMD2014) 1 - 6 2014年04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）
This paper presents drive performance comparisons among three-types of current profiling techniques minimizing torque ripple for switched reluctance (SR) motor in terms of current ripple, a number of switching of converter, motor efficiency and noise. As SR motors have strong magnetic nonlinearity, hysteresis current control is commonly used for their drives. In this case, however, switching frequency of converter should be set as high as possible in order to keep the resultant current ripple as small as possible. In contrast, the proposed current control employs feed-forward voltage control based on non-linear magnetizing curves model and is executed under conventional subharmonic PWM voltage control with fixed switching frequency. Experimental results using 400W 4-phase 8/6 SR motor demonstrate that the proposed current control can provide better drive performances than other hysteresis current control techniques.
DOI： 10.1049/cp.2014.0393
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Experimental Drive Performance Evaluation of High Power Density Wound Field Flux Switching Motor for Automotive Applications 査読あり
T. Kosaka, N. Matsui, Y. Kamada and H. Kajiura
Proc. of the 7th IET International Conference on Power Electronics, Machines and Drives (PEMD2014) 1 - 6 2014年04月
担当区分：筆頭著者 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）
This paper presents experimental drive performances evaluation of wound field flux switching motor for hybrid vehicle drive applications. A test machine with the maximum torque of 210 Nm and the maximum power of 123 kW expected at its design stage is built. A various experimental test result is demonstrated from viewpoints of the maximum torque and the maximum power capabilities and the motor efficiency up to its base speed of 6,000 r/min. As a result, it is confirmed that the test machine promises well as a machine with very high power density more than 4.2 kW/kg at the maximum power point under water jacket cooling.
DOI： 10.1049/cp.2014.0461
