論文 - 小坂 卓
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Multi-mode Vibration Suppression for Electric Machines using Passive Dynamic Vibration Absorbers Mounting on Stator Outer Peripheral 査読あり 国際誌
Naho Funasaka, Makoto Isobe and Takashi Kosaka
Proc. of 27th International Conference on Electrical Machines and Systems (ICEMS2024) 1 - 6 2024年11月
担当区分：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：The Institute of Electrical Engineers Japan
This paper presents multi-mode vibration suppression of electromechanical systems using a passive dynamic vibration absorber attached to a stator outer peripheral of an electric machine. The principle of vibration generation in an electric motor is explained. Subsequently, the structure and design procedure of passive dynamic vibration absorber for each vibration mode. The arrangement of these passive dynamic vibration absorbers on the stator periphery is then examined. Finally, the multi-mode vibration suppression effect is validated through hammering tests using a stator core with fabricated passive dynamic vibration absorbers attached.
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Design Study on Hybrid Excitation Generator for Micro-hydroelectric System 査読あり 国際誌
Kazuto Maruyama, Takashi Kosaka, Yasushi Kato, Naoki Yamamoto, Yoshiki Yasuda and Akio Yamagiwa
Proc. of 27th International Conference on Electrical Machines and Systems (ICEMS2024) 1 - ５ 2024年11月
担当区分：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：The Institute of Electrical Engineers Japan
This paper presents design study on a hybrid excitation machine as a generator for a micro-hydroelectric system. A hybrid excitation generator is a kind of variable flux machines and has two mmf sources such as a permanent magnet and the field excitation coil that enables to adjust a total amount of airgap field flux produced by two mmf sources. With the variable field flux capability, a hybrid excitation generator promises to expand high torque oper-ating range at low speed region while keeping operating power range at middle and high-speed region as required in the target application under given maximum voltage and current restrictions. Application-oriented design of hybrid excitation generator under given design constraints and specifications using finite element electromagnetic analysis is conducted. As a result, it is confirmed that the designed hybrid excitation generator meets the requirement for a target micro-hydroelectric system.
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Modelling for PWM Carrier Loss Evaluation in Claw-pole Machine using MATLAB/Simulink 査読あり 国際誌
Yusuke Okunishi, Takashi Kosaka, Yu Hirai, Yoshihiro Miyama and Hideaki Arita
Proc. of 27th International Conference on Electrical Machines and Systems (ICEMS2024) 1 - 7 2024年11月
担当区分：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：The Institute of Electrical Engineers Japan
This paper proposes an evaluation model for PWM carrier loss in claw-pole machines employed for ISG applications under dual three-phase drive. The PWM carrier loss is evaluated based on PWM carrier voltage waveform and high-frequency impedance. The proposed model is composed of the equivalent circuit model that uses machine parameters measured from an actual machine, and PWM carrier loss is evaluated using the PWM carrier voltage waveform obtained from the proposed model and the measured high-frequency impedance. The validity of the proposed model is examined by comparing the model-based evaluation results with the experimental results.
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Design Study on High Power Density Quasi-Coreless PMSM for Vehicle Traction Drive Rotating at 50,000r/min as the Maximum Speed 査読あり 国際誌
Teruchika Ishihara, Ayaka Sakuma and Takashi Kosaka
Proc. of 27th International Conference on Electrical Machines and Systems (ICEMS2024) 1 - 6 2024年11月
担当区分：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：The Institute of Electrical Engineers Japan
This paper presents a design study on high-power density quasi-coreless permanent magnet synchronous motor for vehicle traction drives rotating at 50,000r/min as the maximum speed. Stator body is composed of carbon fiber rein-forced plastic, a small amount of soft magnetic composite core and aluminum windings. Rotor body consists of car-bon fiber reinforced plastic frame and polar anisotropic magnet. FEA-base feasibility study on the quasi-coreless motor with high power density and reduced losses are investigated, targeting the maximum speed of 50,000 r/min, the maximum power of 150 kW and the power density more than 10 kW/kg.
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Isolated AC/DC converter used in EV/PHEV battery charger from household AC outlet 査読あり 国際誌
Daisuke Endo, Hiroaki Matsumori, Takashi Kosaka, Sadanori Suzuki and Kenichi Nagayosh
Proc. of 2022 IEEE Energy Conversion Conference & EXPO(ECCE) 2022年10月
担当区分：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：IEEE
This paper presents an isolated AC/DC converter used in a battery charger for EV/PHEV. The converter works for
EV/PHEV battery charger from a household outlet with AC
100V/200V to the high voltage main battery with 350V. A typical isolated AC/DC converter consists of a PFC circuit and an isolated DC/DC converter. However, this configuration requires the 12-power semiconductor deceives, which is an obstacle to downsizing, cost reduction, and power conversion efficiency. Therefore, the authors integrate an isolated SEPIC circuit and a totem-pole PFC circuit. The number of power semiconductor devices is reduced from 12 to 6. In this paper, the operating principle of the proposed converter is firstly explained. Then, the circuit operation at 1kW output is verified in the experiment. -
Comparative Study on Hybrid Excitation Flux Switching Motors without and with Variably Magnetizable Permanent Magnets for Electrified Vehicle Propulsion 査読あり 国際誌
T. Okada, T. Kosaka, H. Matsumori, and N. Matsui
World Electric Vehicle Journal 12 ( 2 ) 58 2021年04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：MDPI
A demand for high efficiency traction motors has been accelerated by the promotion of electrified vehicles, such as battery and fuel cell electric vehicles. As a part of development of the high efficiency traction motor, this paper reports a comparative study on two kinds of hybrid excitation flux switching motors (HEFSM) as a variable flux machine. One is the conventional HEFSM, which consists of a stator with constantly magnetized-permanent magnets, field excitation coils (FECs) and three-phase armature windings, and a rotor with salient poles like a switched reluctance motor. The other is a HEFSM employing variably magnetizable-permanent magnets (VM-PMs) that replace a part in the FEC slot area in the conventional one. Based on the variable magnetization nature of VM-PMs, the latter HEFSM promises that the replacement of magnetomotive force (mmf) of FECs with that of the VM-PMs makes the motor efficiency better at both low- and high-speed under the low-torque condition, that is, at both urban driving or highway cruising. To verify that, finite element analysis- (FEA)-based design simulations, as well as experimental performance evaluations for the two kinds of HEFSM, were conducted under reasonable dimensional and electrical constraints. As a result, it is shown that the latter HEFSM can achieve higher motor efficiency at the low-torque and high-speed region while keeping the motor efficiency at the low-torque and low-speed region.
DOI： 10.3390/WEVJ12020058
その他リンク： https://www.mdpi.com/journal/wevj/special_issues/PMM_for_EV
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Power Conversion Efficiency Prioritized AC Filter Inductor Design for Three-Phase PWM Inverter 査読あり 国際共著 国際誌
H. Matsumori, D. Mizutani, T. Kosaka, N. Matsui, T. Miyazaki, and Y. Okawauchi
AIP Advances 11, 015338 - 11, 015338-4 2021年01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：American Institute of Physics
This study was conducted to develop a design method of power density and efficiency maximization for three-phase pulse-width modulated (PWM) inverters that include AC filter. A tradeoff relationship exists between power density and efficiency. In general, increasing the switching frequency is known to increase the switching device loss and decrease the volume of the passive components. A three-phase PWM inverters design should consider the balance between conversion efficiency and inverter volume. However, best of our knowledge, no practical study has focused on the optimal design of a three-phase PWM inverter that includes an AC filter. This is because the iron loss of the AC filter inductor changes in complicated ways depending on the DC-bias excitation, amplitude of switching ripple current, etc. Therefore, the present authors clarified this iron loss mechanism and realized a highly accurate iron loss calculation method in previous studies. In this paper, the relationship between efficiency and volume for the switching frequency was analyzed when the AC filter inductor was designed for minimal loss by adjusting the core diameter, height, and number of winding turns. The efficiency and volume optimization achieved by designing a proper inductor was verified via comparison with a base design.
DOI： 10.1063/9.0000162
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ニューラルネットワークを用いた三相PWMインバータ用ACフィルタインダクタの損失最小化に関する検討
山口 大勢, 水谷 大輔, 松盛 裕明, 小坂 卓, 宮崎 達也, 大河内 裕太
2022電気学会産業用用部門大会講演論文集 I-237 - I-240 2022年08月
担当区分：責任著者 記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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磁石配置と形状比最適化による可変磁力磁石採用 HEFSMの実験運転特性と解析特性の比較検討 招待あり
小坂 卓, 齋藤 充, 岡田 孟士, 松盛 裕明, 松井 信行
自動車技術会2022年春季大会学術講演会講演論文集 1 - 6 2022年05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（研究会，シンポジウム資料等）
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高精度トルク制御のためのIPMSMの新たなd-q軸等価回路モデルの検討
加納 善明, 小坂 卓, 北条 善久, 大森 洋一
2022電気学会研究会資料 2022年03月
担当区分：責任著者 記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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Open Device Fault Detection and Fail Safe Action Strategy for a Premium Class Electric Vehicle with a Dual Inverter fed Open Winding Motor 査読あり 国際誌
Hiroaki Matsumori, Yuto Maeda, Takashi Kosaka, Nobuyuki Matsui, Hiroki Iwai, Teppei Tsuda, Subrata Saha
Proc. of 2021 IEEE Energy Conversion Congress and Exposition (ECCE) 1527 - 1533 2021年10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：IEEE
A premium class electric vehicle (EV) needs high
drive system efficiency, low motor noise and limp-home capability
of the traction drive when there is a component failure. A dual
inverter fed open winding interior permanent magnet
synchronous motor (DIF-OW-IPMSM) drive system satisfied all
the above needs. In this paper, a new algorithm of inverter open-
circuit fault diagnosis and fail-safe action strategy for the DIF-
OW-IPMSM drive system are proposed and presented to prove its
high reliability. The proposed new algorithm is verified by suitable
simulation and experimental results, and the safe limp-home
capability of the DIF-OW-IPMSM drive system is demonstrated. -
New PWM Switching Strategy for a Dual Inverter Fed Open Winding Motor Drive System 査読あり 国際誌
Yuto Maeda, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui, Hiroki Iwai, Teppei Tsuda, Subrata Saha
Proc. of 2021 IEEE Energy Conversion Congress and Exposition (ECCE) 4803 - 4809 2021年10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：IEEE
The dual inverter fed open winding interior permanent magnet synchronous motor (DIF-OW-IPMSM) is a promising traction drive system configuration for a high power
and high efficiency electric vehicle. In this paper, a new PWM switching strategy of the inverters is presented when the motor is operating in the medium and high speed region. The PWM switching strategy consists of operating one of the inverters in the low switching frequency 1 pulse (square wave) mode and the other
inverter in the high switching frequency specialized continuous pulse width modulation (SCPWM). The new PWM strategy has been verified from suitable simulation and experimental results in the medium speed range. Finally, a dual inverter configuration with a hybrid combination of Si IGBT inverter and SiC MOSFET inverter is recommended for a premium class electric vehicle to
improve the drive system efficiency. -
Optimum Design Study on HEFSM Using Variably Magnetizable PM with Low L/D Ratio and Novel PM Arrangement for EV/HEV Traction Applications 査読あり 国際誌
Takeshi Okada, Mitsuru Saito, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui
Proc. of 2021 IEEE Energy Conversion Congress and Exposition (ECCE) 3737 - 3744 2021年10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：IEEE
This paper focuses on a hybrid excitation flux switching motor (HEFSM) using variably magnetizable permanent magnets (VM-PMs) as variable flux motors for EV/HEV propulsion. The HEFSM makes an energization of field excitation coil unnecessary for most of the operating conditions so that it enlarges high efficiency operating area thanks to reductions of both copper and iron losses by adequately controlling magnetization state of the VM-PMs according to given operating conditions. In this paper, a new HEFSM design is proposed, which employs a novel PM arrangement as well as a flat motor shape with an optimum L/D ratio aiming at total PM usage reduction and the variable flux capability and maximum torque improvement. FEA-based simulation results show that the motor efficiency and variable flux capability of the proposed HEFSM are comparable with those of a previous PM-rich HEFSM while satisfying the target maximum torque and demagnetization tolerability of PMs under the total PM usage limitation.
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Magnetization State Control of Variably Magnetizable Permanent Magnets Employed in HEFSM at Starting Up 査読あり 国際誌
T. Okada, M. Saito, T. Kosaka, H. Matsumori, and N. Matsui
Proc. of 2021 IEEE International Electric Machines & Drives Conference (IEMDC) 1 - 8 2021年06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 Electronics Engineers(IEEE)
This paper presents the magnetization state control of variably magnetizable-permanent magnets (VM-PM) - for a hybrid excitation flux switching motor (HEFSM) at the initial starting up. The HEFSM employing Nd-Fe-B type magnets with low coercive force as VM-PMs can achieve higher efficiency driving over the whole operating area compared with the conventional HEFSM without VM-PMs by appropriately adjusting the magnetization state according to a given operating condition. To put such the HEFSM into practical use for automotive traction applications, it is essential to be able to intentionally control the magnetization state by applying a pulsewise current to field excitation coil (FEC) during rotation as well as at starting up aiming at initialization of the magnetization state of VM-PMs. At first, a difference in the magnetization state controllability during middle-speed rotation and at a standstill and the angular dependence of the magnetizing magnetic field applied on VM-PM are investigated and discussed. Subsequently, the “quasi-impulse current train magnetization method” at starting up is proposed as a novel magnetization state control scheme. The effectiveness of the proposed control scheme is experimentally verified using a 60kW test motor. As a result, it is revealed that the magnetization control at the starting up can be achieved similar to that during the middle-speed rotation.
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Torque Ripple Minimization Control in SRM Based on Magnetizing Curve Model Considering Mutual Coupling 査読あり
Sungyong Shin, Hikaru Naruse, Takashi Kosaka, Nobuyuki Matsui
IEEJ Journal of Industry Applications 9 ( 6 ) 637 - 649 2021年01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：一般社団法人電気学会
In order to minimize torque ripple in a switched reluctance motor (SRM), various control methods have been proposed. One such method is current profiling control based on a mathematical motor model concerned with the relationship between torque position and current, which can be derived from measured magnetizing curves. However, current profiling control faces issues with an increase in torque ripple at the current overlapping region depending on the load condition. In this study, through magnetic analysis using 2D-FEA and mathematical analysis based on a test SRM (four-phase, 400W, and 8/6 pole configuration), the reason why the torque ripple increases is revealed, and a modified torque-position-current model considering mutual coupling is proposed for better control of torque ripple minimization. Experimental studies on torque ripple minimization using the test motor show that the proposed current profiling control offers better torque ripple control performance.
その他リンク： https://www.jstage.jst.go.jp/article/ieejjia/9/6/9_19008125/_article/-char/ja
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Modeling and Simulation of Battery-powered Electric Vehicle on MATLAB/Simulink 査読あり 国際誌
Yu Inoue, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui
Proc. of 2021 International Conference on Electrical Machines and Systems (ICEMS) 694 - 698 2021年10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：The Korean Institute of Electrical Engineers (KIEE)
This paper presents MATLAB/Simulink based modeling and simulation of battery-powered electric vehicle (BEV) to estimate power consumption rate at development stage of a new electric motor. The model of BEV consists of not only the main power components such as a motor, an inverter and a battery, but also includes a driver, a controller and vehicle dynamics. In the model, a simple vehicle model based on Newtonian mechanics is constructed and it is possible to simulate the vehicle running by a motor using electricity obtained from a battery as a power source. JC08 mode as one of the driving pattern mode for evaluating the power consumption rate is used to determine the commanded values for the vehicle running. The power consumption rate is calculated from the distance and the power consumption of the battery. To demonstrate the validity
of the model, this paper deals with NISSAN LEAF EV specifications to compare power consumption rates. -
Design Study on High Torque Density Multiphase Pole-Change Induction Motor for Vehicle Propulsion Drive 査読あり 国際誌
Yuya Matsuyama, Kota Ishizuka,, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui
Proc. of 2021 International Conference on Electrical Machines and Systems (ICEMS) 426 - 431 2021年10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：The Korean Institute of Electrical Engineers (KIEE)
To realize an induction motor with high torque density for vehicle traction drives, this paper presents a design study on a multiphase pole-change induction motor (MPCIM). A principle of the pole-change is based on a harmonic operation of a multiphase inverter connected with the MPCIM where the multiphase windings are mesh-connected with a span. Major variables to be designed for the MPCIM are the phase number,the time harmonic order of phase current and the span. 2D-FEA based design investigations are conducted and conclude that the MPCIM with eight-phase winding of spanning with three and changing eight- and twelve-pole achieves high-torque density compete with an IPMSM installed on a commercialized EV.
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Soft-switching condition and control method of boost chopper for DC-DC converter utilizing GaN power devices for automobile applications 査読あり 国際誌
Asuka Shimodaira, Hiroaki Matsumori, Takashi Kosaka and Nobuyuki Matsui
Proc. of the 23rd International Conference on Electrical Machines and Systems (ICEMS) 2020年11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 Electronics Engineers(IEEE)
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Design and Experimental Studies on HEFSM Employing Two Types of Permanent Magnets per Pole as Traction Motor for Automobile Applications 査読あり 国際誌
Takeshi Okada, Keita Otsuka, Hiroaki Matsumori, Takashi Kosaka and Nobuyuki Matsui
Proc. of the 23rd International Conference on Electrical Machines and Systems (ICEMS) 2020年11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 Electronics Engineers(IEEE)
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High Speed Homopolar Type Permanent Magnet Motor Designed for Fast Acceleration Response 査読あり 国際誌
Hideaki Arita, Kazuhiro Nishiwaki, Masahiro Iezawa, Takashi Kosaka
Proc. of the 23rd International Conference on Electrical Machines and Systems (ICEMS) 2020年11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 Electronics Engineers(IEEE)
