論文 - 小坂 卓
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AC filter inductor design for a three-phase PWM inverter 査読あり 国際誌
Daisuke Mizutani, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui, Tatsuya Miyazaki and Yuta Okawauchi
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：The Institute of Electrical and Electronics Engineers(IEEE)
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High-frequency Diagnostic Current Injection-Based Permanent Magnet Temperature Estimation of IPMSM at Standstill 査読あり 国際誌
Haruki Katsumi, Ryo Ohno, Hiroyuki 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 core loss base data collection for core loss calculation under power electronics converter excitation 査読あり 国際共著
Hiroaki Matsumori,Toshihisa Shimizu, Takashi Kosaka, and Nobuyuki Matsui
IEEJ Journal of Industry Applications 2020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：一般社団法人電気学会
The calculation of core loss of power electronics converters requires a large number of core loss data, including the excitation frequency, flux density ripple, and DC magnetic field bias characteristic under rectangular voltage excitation. However, in the case of the conventional method (that employs a B-H analyzer with a chopper circuit), a very long time is required to collect this core loss base data, because circuit parameter tuning is needed for each measurement point. Therefore, we propose a high-speed core loss base data collection method for core loss calculation under power electronics converter excitation. The core loss base data collection time was substantially reduced upon usage of a pulse width modulated (PWM) inverter and a neural network because various core loss characteristics were expressed upon excitation of the PWM inverter, and these core losses were learned by the neural network. The core loss base data, as measured via the proposed and conventional methods, were compared to validate the measurement accuracy of the proposed method, and the difference was found to be lesser than 12%. Thus, the proposed method achieves high-speed core loss base data collection.
その他リンク： https://www.jstage.jst.go.jp/article/ieejjia/advpub/0/advpub_20006557/_article/-char/ja
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Basic Study on Efficiency Improvement of Hybrid Excitation Flux Switching Motor using Variably Magnetizable Permanent Magnets for Automotive Traction Drives 査読あり 国際誌
K. Otsuka, T. Okada, T. Mifune, H. Matsumori, T. Kosaka and N. Matsui
Proc. of 2020 IEEE Energy Conversion Congress and Exposition (ECCE) 27 - 34 2020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：Institute of Electrical and Electronics Engineers(IEEE)
This paper deals with a hybrid excitation flux
switching motor (HEFSM) employing a variably magnetizable permanent magnet as an automobile traction motor for a hybrid electric vehicle. Compared with the conventional HEFSM, a difference can be found on the stator body that newly utilizes the variably magnetizable permanent magnets adding to the
conventional parts such as laminated steel core, three-phase armature coils, field excitation coils and constantly magnetized permanent magnets. A basic concept to improve motor efficiency is based on replacing the mmf of field excitation coils with that of the variably magnetizable permanent magnets. The magnetizing state of the variably magnetizable permanent magnet is adjusted properly according to operating conditions, resulting in the copper loss and iron loss reductions. FEA-based design and
simulation as well as experimental test-based performance evaluation results of the proposed HEFSM show that the motor efficiencies under frequent operating conditions compete with those of the IPMSM installed on TOYOTA fourth-generation PRIUS. -
Optimum PWM Switching Mode Selection of Dual Inverter-fed Open Winding IPMSM Drive System for High-power Premium Class EV 査読あり 国際誌
H. Matsumori, Yuki Makimura, Shoshi Morisita, Yuto Maeda, Takashi Kosaka, Nobuyuki Matsui, Naoto Saito,Yoshinobu Ito, Subrata Saha
Proc. of 2020 IEEE Energy Conversion Congress and Exposition (ECCE) 6318 - 6324 2020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：Institute of Electrical and Electronics Engineers(IEEE)
A dual inverter-fed open winding interior
permanent magnet synchronous motor employing a
dual battery source is found to be a promising drive
system configuration for a high-power premium class
electric vehicle. From the standpoints of high drive
system efficiency and low motor acoustic noise, in this
paper, selection of different optimum PWM switching
modes according to the vehicle driving states is
proposed for such a drive system configuration.
Suitable simulation and experimental results for the
motor drive system with 65 kW are presented to
validate the proposed selection of different optimum
PWM switching modes based on the vehicle driving
states. -
Loss evaluation of aluminum electrolytic capacitor under power electronics converter excitation 査読あり
H. Matsumori, T. Kosaka, N. Matsui, K. Onda, M. Ozawa and K. Toda
Proc. of 2020 IEEE Applied Power Electronics Conference and Exposition (APEC) 2666 - 2670 2020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)
Aluminum electrolytic capacitors used in power electronics converters are a major factor that reduce the reliability of these devices. To evaluate the lifetime and reliability of this type of capacitors, capacitor loss needs to be evaluated under the excitation conditions of power electronics converters. However, the capacitor loss data provided by manufacturers is always measured under sinusoidal excitation. The authors therefore proposed a capacitor loss evaluation method for arbitrary excitation waveforms found in power electronics converters. This method features a simple configuration, and the capacitor loss can be practically evaluated using a function generator without the need of a real power electronics converter. Therefore, the capacitor loss can be analyzed under different conditions, ranging from fundamental analysis to practical analysis, for instance, pulse-width modulated (PWM) inverter excitation. In this study, the capacitor loss was evaluated using fundamental excitation and (PWM) inverter excitation. Moreover, the capacitor loss of four different type of capacitors was assessed. Under PWM inverter excitation, nonlinear loss behaviors were observed. Nonlinear loss characteristics could be expressed using a hysteresis curve in the Q-V plane. It was found that the hysteresis curves changed when the rectangular excitation current had zero current phases and different duty ratios due to the voltage unbalance of the tunnel pit capacitance in the capacitor sheets.
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Core loss calculation for power electronics converter excitation from a sinusoidal excited core loss data 査読あり 国際誌
Hiroaki Matsumori,Toshihisa Shimizu, Takashi Kosaka, and Nobuyuki Matsui
AIP Advances ( 10 ) 045001-1 - 045001-4 2020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：American Institute of Physics
The authors propose a core loss calculation method for power electronics converter excitation from sinusoidal excited core loss data. This method is based on Brockmeyer’s theory and adapts to calculate core loss under DC-bias excitation conditions. Furthermore, the number of core loss test conditions are reduced as this method only requires the addition of DC-bias characteristics to the sinusoidal excitation core loss data provided by the core manufacturers. To validate the proposed method, the core losses under sinusoidal and square voltage excitations are first measured by a BH analyzer with a DC-bias excitation unit. Then, the measured values under a square voltage excitation and the calculated values from a sinusoidal excited core loss data are compared.
DOI： 10.1063/1.5129419
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Design and Performance Analysis of Various High Torque Segmented rotor HE-FSM Topologies for Aircraft Applications 査読あり 国際共著 国際誌
Hassan Soomro, Erwan Sulaiman, Takashi Kosaka
IET Electric Power Applications 1 - 10 2019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：Institution of Engineering and Technology
DOI： 10.1049/iet-epa.2019.0476
その他リンク： https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2019.0476
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Hybrid excitation flux switching motor with permanent magnet placed at middle of field coil slots and high filling factor windings 査読あり 国際誌
Tekeshi Okada, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui
CES Transactions on Electrical Machines and Systems 3 ( 3 ) 248 - 258 2019年10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：China Electrotechnical Society
Design and experimental studies on a hybrid excitation flux switching motor as a traction motor for hybrid electric vehicles drive are presented. A stator body of the motor consists of not only laminated silicon-iron electromagnetic steel and three-phase armature windings, but also both of field excitation coils and permanent magnets working together as a variable field magnetomotive force source. On the other hand, a rotor is composed of just laminated silicon-iron electromagnetic steel with salient poles like switched reluctance motor. To bring out the best in drive performances of the hybrid excitation flux switching motor as a variable flux motor for the application, each material adopted for the stator and rotor body should be designed properly in terms of motor efficiency, maximum torque and power densities and so forth. As some of them, in this paper, thinner silicon-iron electromagnetic steel sheet and permanent magnets with high remanent and low amount of Dysprosium used are applied for achieving higher motor efficiency. Moreover, all coils wound flatwise and edgewise using rectangular wires are introduced to realizing high filling factor for reduced copper losses. Experimental tests using a 60kW prototype of the motor demonstrates the designed motor has good motor efficiency under frequent operating points expected for the target vehicle drive.
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Flux Profiling Control-Based Noise and Vibration Reduction of SR Motor for Automobile Traction Drive 査読あり 国際誌
Takashi Kosaka, Sunyong Shin, Soshi Morishita, Daisuke Mizutani, Hiroaki Matsumori, Nobuyuki Matsui
Proc.of 2019 IEEE Energy Conversion Conference & EXPO(ECCE) 7098 - 7104 2019年09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） 出版者・発行元：IEEE
A main source producing noise and vibration in a switched reluctance motor is time variation of radial force acting on stator tooth during excitation period. Based on this principle, two different control are examined and compared in this paper. One is two-stage commutation method well-known as active vibration cancellation technique and the other is flux profiling control. The flux profiling control proposed in this study considers an increased degree of freedom of flux profile with superposition of lower order harmonics. The parameters for flux profile are optimized by genetic algorithm to minimize vibration and acoustic noise while keeping target torque and minimizing power loss as well as torque ripple. Experimental studies on drive performance comparisons under different control using 50kW three-phase 18/12 test motor are carried out. As a result, the proposed control employing the optimized flux profile works better than the conventional two stage commutation method in terms of higher motor efficiency, reduced noise and vibration, and less torque pulsation.
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Iron loss calculation under PWM inverter switching for SiFe steel materials 査読あり 国際誌
Hiroaki Matsumori, Toshihisa Shimizu, Takashi Kosaka, Nobuyuki Matsui
Proc. of 2019 IEEE Energy Conversion Conference & EXPO(ECCE) 2315 - 2320 2019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：IEEE
This paper presents an iron loss calculation method
for SiFe steel material under high-frequency current ripple due to PWM switching. The PWM switching produces dynamic minor loops on the BH plane, which cause iron loss. In this study, the improved ertotti's physical model is used for iron loss calculation for dynamic minor loops in SiFe steel material. The calculated iron loss values are compared with the measured iron loss values. The model predicts the iron loss within an acceptable error. However, calculation errors are found when comparing the iron loss value
for each dynamic minor loop. The reason for the calculation errors is that the measured iron loss varies if the flux density bias is different, even if the DC-bias has the same value. The calculation error occurs not only in the improved Bertotti's physical model but also in other methods such as improved Steinmetz equation because these methods do not take into account the flux density bias and/or the DC-bias characteristic. -
自動車の電動化における最新技術動向 査読あり
貝塚 正明，立花 武，小坂 卓， 道木 慎二，太田 豊
電気学会論文誌Ｄ（産業応用部門誌） 139 ( 6 ) 535 - 542 2019年06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：一般社団法人電気学会
Global warming and a risk of depletion of fossil fuels are global concerns. A demand for environmental performance of automobiles is becoming severer year by year. Therefore, automotive manufacturers design BEVs, PHVs, HEVs, FCVs to meet CO2 regulation. This report presents recent technology trends for main components of electrical vehicle.
その他リンク： https://www.jstage.jst.go.jp/article/ieejias/139/6/139_535/_article/-char/ja/
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Isolated DC-DC Converter utilizing GaN power device for Automotive Application 査読あり 国際誌
Hiroaki Matsumori, Takashi Kosaka, Kisho Sekido, Kitae Kim, Takashi Egawa, Nobuyuki Matsui
Proc.of 2019 IEEE Applied Power Electronics Conference and Exposition (APEC) 1704 - 1709 2019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） 出版者・発行元：IEEE
This paper presents an isolated step-sown DC-DC converter using GaN power device for automotive applications. The works for a power supply from a high voltage main battery with 200V to low voltage auxiliary battery with 13.6V in hybrid electric vehicle. A LLC converter is known as isolated DC-DC converter with high-efficiency. However, when input and/or output voltage considerably fluctuates, efficiency of a LLC resonant converter becomes worse. In order to solve this problem, a DC-DC boost-up converter to mitigate efficiency deterioration for the input and/or output voltage fluctuation is added to a LLC resonant converter. Generally speaking, an additional circuit, the boost-up chopper in this case, also deteriorates the total system efficiency. To avoid the efficiency degradation, discontinuous current mode control and GaN power devices are applied to the boost-up chopper. The DC-DC boost-up converter experimentally achieves 99.03% of conversion efficiency at nominal output so that it has no effect on the total system efficiency. Even though adding a DC-DC boost-up chopper to the LLC resonant converter, a power density expected to 10 W/cc.
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Hybrid Excitation Flux Switching Motor with High Filling Factor Windings 査読あり
Takashi Kosaka, Keisuke Isobe, Nobuyuki Matsui
Proc. of the 31st International International Electric Vehicles Symposium & Exhibition (EVS 31) & International Electric Vehicle Technology Conference 2018 (EVTeC 2018) 1 - 6 2018年09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） 出版者・発行元：一般財団法人 日本自動車研究所
In this paper, design and experimental studies on a hybrid excitation flux switching motor (HEFSM) are presented. The HEFSM, which has permanent magnets placed at middle of field coil slots on stator body and employs high filling factor windings to improve motor efficiency owing to copper loss reduction, is designed as a traction motor for hybrid electric vehicles. The maximum torque and power as the design target are set to be 207Nm and 60kW, respectively. From the viewpoints of the maximum torque/power capabilities and the motor efficiency, experimental test results using a prototype HEFSM are demonstrated and discussed.
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Hybrid Excitation Flux Switching Motor with Permanent Magnet Placed at Middle of Field Coil Slots Employing High Filling Factor Windings 査読あり 国際誌
Takeshi Okada, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui
Proc. of 2018 IEEE Energy Conversion Congress and Exposition (ECCE) 4268 - 4274 2018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：The Institute of Electrical and Electronics Engineers, Inc.
Design and experimental studies on Hybrid
Excitation Flux Switching Motor (HEFSM) applied to a
traction motor for hybrid electric vehicles are presented. A stator body of HEFSM generally consists of not only laminated core and three-phase armature coils, but also field excitation coils and permanent magnets as field mmf sources. Therefore, each material used in the stator body should be designed properly with the purpose of performance improvements such
as efficiency, power and torque densities, cost and so forth. The configuration and the arrangement of all coils are examined to increase their filling factor for reducing copper losses. Moreover, thinner electromagnetic steel and permanent magnets with high remanent flux density are employed to achieve higher efficiency. Experimental tests using a prototype
of HEFSM validate the design results. -
Sungyong Shin, Hikaru Naruse, Takashi Kosaka, Nobuyuki Matsui
Proc. of 2018 XIII International Conference on Electrical Machines (ICEM) 1479 - 1484 2018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：The Institute of Electrical and Electronics Engineers, Inc.
For reducing the noise and vibration of switched
reluctance motor (SRM), many kinds of control methods have been proposed. 2-stage commutation method is one of effective method for active vibration cancellation (AVC). For proper operation of the 2-stage commutation method, there should be no vibration except for that at commutation. However, vibration is generally occurred at the point which commutation is not produced. Although 2-stage commutation method is used, it is difficult to reduce these vibration. In this study, through the electro-magnetic structural coupled analysis based on FEA for vibration and electromagnetic force in 4-phase 8/6 SRM, the reason why other vibration are occurred and the vibration
reduction based on the 2-stage commutation does not work are investigated. According to the nvestigations, a new design on the shape of rotor pole to reduce vibration and noise is proposed. Through simulation and experiment, the vibration and noise reduction are revealed. -
Sungyong Shin, Takashi Kosaka, Nobuyuki Matsui
Proc. of 2018 XIII International Conference on Electrical Machines (ICEM) 1558 - 1564 2018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：The Institute of Electrical and Electronics Engineers, Inc.
To eliminate position sensor from switched reluctance motor drive, many kinds of position estimation methods have been proposed. Most of them require current or voltage sensing to compute inductance or flux linkage, and data tables concerning with these parameters and rotor position. The current sensor is generally expensive. In addition, large amount of memory is necessary to save the data tables. To overcome these problems in this paper, a simple position estimation method using a gradient of distributed phase voltage obtained from voltage injection into SRM through full bridge bipolar type inverter is proposed. However, this method has estimation error at some position. To solve this problem, also novel method using voltage rates of distributed voltage are proposed. As a result, the position estimation with high resolution in wide speed range including standstill is possible. Through experiment using 400W four-phase 8/6 test motor, the effectiveness of proposed method is demonstrated.
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Torque Ripple Minimization Control of SRM Based on Novel Motor Model Considering Mutual Coupling Effect 査読あり
Sungyong Shin, Naruse Hikaru, Takashi Kosaka, Nobuyuki Matsui
Proc. of 2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia) 3418 - 3425 2018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：一般社団法人電気学会
In order to minimize torque ripple in switched reluctance motor (SRM), many kinds of methods have been proposed. One of them is current profile tracking control based on a motor model, torque-position-current model, which can be derived from magnetizing curves. However, the current profile tracking control has a problem which is an increase in torque ripple at the current overlapping region under high load condition. In this paper, through magnetic analyses using 2D-FEA and mathematical analyses regarding 4-phase 8/6 SRM, the reason of the increase in torque ripple is revealed and a novel torque- position-current model taking mutual coupling effect into account is proposed for better torque ripple minimization control.
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Study on commutation control method for reducing noise and vibration in SRM 査読あり 国際誌
Sungyong Shin, Naoki Kawagoe, Takashi Kosaka, Nobuyuki Matsui
IEEE Transactions on Industry Applications 54 ( 5 ) 4415 - 4424 2018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：The Institute of Electrical and Electronics Engineers, Inc
Many kinds of commutation methods have been proposed to reduce the noise and vibration in a switched reluctance motor (SRM). One of these is well known as the two-stage commutation method. However, it has a defect that is principally revealed when an SRM is operated at high speed and under a high-load condition. This study investigated why vibration reduction based on two-stage commutation does not work through an electromagnetic-structural coupled analysis using a finite element method and mathematical analysis of the exciting force in a 0.4 kW four-phase 8/6 SRM. Based on the investigations, a modified method is proposed to reduce the vibration and noise independent of the operating condition. Experimental studies using the tested SRM demonstrated that the proposed modified control method could reduce the noise and vibration at high speed and under a high-load condition.
その他リンク： https://ieeexplore.ieee.org/document/8351973?arnumber=8351973&source=authoralert
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Study on commutation control method for reducing noise and vibration in SRM 査読あり 国際誌
Sungyong Shin, Naoki Kawagoe, Takashi Kosaka, Nobuyuki Matsui
Proc. of 2017 20th International Conference on Electrical Machines and Systems (ICEMS) 1 - 6 2017年08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
In order to reduce noise and vibration in switched reluctance motors (SRM), many kinds of commutation methods have been proposed. One of them is well-known as 2-stage commutation method. However, it has a defect which is revealed particularly when SRM is operated at high speed and high load condition. In this study, through the magnetic-structural coupled analysis using FEM and the mathematical analysis of exciting force in 4-phase 8/6 SRM, the reason why vibration reduction based on the 2-stage commutation does not work is investigated. According to the investigations, a modified method to reduce vibration and noise independent from operating condition is proposed.
