著者

伊東 淳一 豊崎 次郎 大沢 博

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.122, no.3, pp.253-259, 2002-03-01 (Released:2008-12-19)

参考文献数

12

被引用文献数

19 33

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This paper proposes a novel V/f control method for PM motor drive system without position sensor. Unlike sensorless vector control, V/f method does not require high performance digital processing.This paper presents three novel topics for V/f control. At First, instability of conventional V/f control is shown, and a stabilization method consisting of a high-pass -filter and a feed back from d-axis current is proposed. After that, a control strategy yielding high efficiency is introduced. It is shown that the condition id=0, corresponding to high efficiency operation for SPM, can be achieved without explicit estimation of dq-axis. Furthermore, since this method is based on the evaluation of the reactive power, knowledge of R_??_ and e. m. f. is not required. At last, a starting method that does not need flux saturation to decode NS pole of permanent magnet, is proposed. The structure of the resulting control system is very simple and its effectiveness has been confirmed experimentally by using 1.5kW, 3600r/min and 3.7kW, 7200r/min PM motors.

著者

東 淳一 新谷 奈津子 仁科 恭徳 小泉 利恵 金丸 敏幸 山下 仁司

出版者

神戸学院大学

雑誌

基盤研究(C)

巻号頁・発行日

2018-04-01

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本研究の目的は、英語のスピーキングの学習を促す教具としての人工知能の有効性と、英語スピーキング力測定の際の学習情報収集用教育ツールとしての人工知能の有効性の両方を検証するために実証実験を行うことである。 1年目の研究準備段階では、まず米国AKA社の英語学習用人工知能ロボット「Musio」を導入してその動作確認を行い、研究計画を立案した。2年目には、Musioとの対話を通じて特定の問題の回答を導くためのタスクを構築することとしたが、実際のMusioとの対話ではタスクベースの会話が想定通り機能しなかった。このため、急遽実験方法を変更し、大学生の実験協力者とMusioの間で自由会話を行ってもらい、その会話記録の分析を行った。実験後に会話記録分析を開始し、実験協力者にはMusio使用の会話練習についてのアンケートを実施し、いわゆる人工知能ロボットの導入が学習者に与えるインパクトを調査することとした。3年目の2020年度については新型コロナ感染拡大により、実験等ほとんどの事業が不可能となった。このためMusioとは別に人工知能的なエンジンをもつ対話システムであるAmazon Lexを用いた音声ベースの対話システムの構築実験を実施し、さらにこのような音声対話システムに用いられる最新のTTS合成音についても調査した。

著者

塩井 太介 宮下 充 渡辺 大貴 日下 佳祐 伊東 淳一 中西 俊貴 小林 和博

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.141, no.7, pp.520-531, 2021-07-01 (Released:2021-07-01)

参考文献数

30

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This paper proposes a multiport converter based on a flying capacitor converter topology for use in a battery management system. The proposed circuit operates in discontinuous current mode and pulse frequency modulation in order to reduce inductor volume. The circuit achieves load fluctuation compensation and maximum power point tracking of the photovoltaic (PV) system by deciding duty ratio based on load current and PV output current. According to the experimental results, an efficiency of more than 95.8% was achieved under all operation conditions. In addition, the maximum efficiency reached 98.8% at the rated load (750W). Furthermore, the inductor volume reduced by 85.5% compared to that of the conventional circuit using two inductors.

著者

塩井 太介 熊谷 崇宏 日下 佳祐 伊東 淳一

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.142, no.3, pp.198-205, 2022-03-01 (Released:2022-03-01)

参考文献数

31

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This paper proposes a low vibration stopping method by switching between the free-run and short-circuit braking modes of a compressor. Vibrations are generated by the bouncing of the rotor caused by load torque fluctuations. The proposed method suppresses the bouncing by stopping the motor during the suction process, thereby preventing the generation of a large torque. In order to stop the motor during the suction process, the proposed method switches from the free-run to short-circuit braking mode at the top dead center, which is the starting point of the suction process. Furthermore, the inrush current during the short-circuit braking mode is suppressed using a hysteresis current controller. The vibrations are evaluated under four pressure conditions using the conventional and proposed methods. The results show that, the proposed method achieves more than 50% reduction in the amplitudes of the vibrations at all four pressure conditions. Notably, the proposed method reduces the amplitude of the vibration by 71% under the high-pressure condition.

著者

熊谷 崇宏 伊東 淳一 日下 佳祐 佐藤 大介

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.141, no.12, pp.962-975, 2021-12-01 (Released:2021-12-01)

参考文献数

21

被引用文献数

1

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This paper proposes an automatic design method of typical parameters such as number of phases, number of poles, stack thickness, stator outer diameter, rotor outer diameter, and number of turns of a switched reluctance motor from the requirement of the N-T characteristic. In particular, a specific parameter related to the magnetic saturation is defined in order to arbitrarily determine how much to use the magnetic properties of the iron core material. In the proposed method, the typical motor parameters in order to realize a miniaturized volume which satisfies an input N-T characteristic are obtained by setting the parameter related to magnetic saturation, maximum electrical frequency, maximum current density, maximum copper loss, conductor slot fill factor, magnetic properties of material, and input voltage. The designed motor is analyzed using the Finite Element Method in order to validate the proposed method.

著者

綾野 秀樹 北田 成祐 井口 雄紀 松井 義弘 伊東 淳一

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.140, no.6, pp.442-449, 2020-06-01 (Released:2020-06-01)

参考文献数

25

被引用文献数

4

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This paper proposes a novel modulation technique that reduces both motor acoustic noise and switching loss. The conventional discontinuous PWM method can reduce the switching loss to a greater extent compared to the conventional three-phase modulation method; however, the acoustic noise of the motor increases. The proposed technique adjusts the zero-sequence voltage given to the voltage references in such a way that the discontinuous part of the conventional discontinuous PWM method is changed smoothly. The switching loss with the proposed technique can be reduced to 58% of that with the conventional three-phase modulation method. The experimental results show that the acoustic noise can be reduced to a greater extent with the proposed technique compared to that with the conventional discontinuous PWM method.

著者

宮脇 慧 伊東 淳一 岩谷 一生

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society (ISSN:09136339)

巻号頁・発行日

vol.130, no.1, pp.43-50, 2010-01-01

参考文献数

11

被引用文献数

5 4

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This paper proposes a high efficiency isolated DC/DC converter using series compensation. The proposed converter consists of a high efficiency resonance half-bridge converter and a series converter. The proposed circuit regulates the output voltage by the series converter, which provides only differential voltage between the input voltage and output voltage. Therefore, the circuit achieves high efficiency when the input voltage is close to the output voltage, because only the resonance converter operates.<br>In this paper, the approach used to obtain high efficiency with the proposed series compensation method is introduced. In addition, the fundamental operation and the design method of the proposed circuit are described. The validity of the proposed circuit was confirmed by experiment and loss analysis, with a maximum efficiency of 95.8%.

著者

宮脇 慧 伊東 淳一 岩谷 一生

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society (ISSN:09136339)

巻号頁・発行日

vol.133, no.9, pp.876-884, 2013-09-01

参考文献数

23

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This paper discusses a bidirectional isolated DC/DC converter using the series compensation method. The proposed converter consists of a high efficiency resonance full-bridge converter and a series converter. This proposed circuit regulates the output voltage by the series converter, which provides only the differential voltage between the input voltage and the output voltage, which is close to the nominal voltage.<br>In this study, four types of auxiliary circuits are investigated in terms of loss. The relationship between the loss element and efficiency characteristics is clarified. The validity of the proposed circuit is confirmed by the loss calculation. Moreover, the experimental results confirmed that the proposed circuit, which converts 48V to 380V at 1kW, achieves a maximum efficiency of 95.5% at the nominal input voltage region.

著者

宮脇 慧 伊東 淳一 岩谷 一生

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. D, 産業応用部門誌 (ISSN:09136339)

巻号頁・発行日

vol.131, no.10, pp.1175-1183, 2011

被引用文献数

1 2

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This paper proposes a new circuit topology for a high efficiency isolated DC/DC converter using series compensation. The proposed converter consists of a high efficiency resonance half-bridge converter and a series converter. The series converter regulates the output voltage the provides only the differential voltage between the input voltage and output voltage. Therefore, the circuit achieves high efficiency when the input voltage is almost equal to the output voltage, because then only the resonance converter will operate.<br>In this paper, the approach employed to achieve a high efficiency by using the proposed series compensation method is introduced. In addition, the fundamental operation and the method of designing the proposed circuit are described. The suitability of the proposed circuit was confirmed by performing an experiment and loss analysis, maximum efficiency achieved was 96.2%.

著者

宮脇 慧 伊東 淳一 岩谷 一生

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society (ISSN:09136339)

巻号頁・発行日

vol.133, no.3, pp.360-367, 2013-03-01

参考文献数

14

被引用文献数

2

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This paper proposes a design procedure in the efficiency of a resonant type half-bridge converter for a high efficiency isolated DC/DC converter. The design procedure is based on the loss calculation. The relationship between the loss element and the efficiency characteristics was clarified. The loss analysis method based on the parameters of the circuit element is formulated. The analysis results agree well with experimental results. In addition, the highest efficiency of 96.8% is obtained using the half-bridge converter. Finally, design procedure in the efficiency was clarified using a design procedure flowchart.

著者

熊谷 崇宏 伊藤 健 西川 滉大 伊東 淳一 山根 和貴 山田 伸明 名和 政道

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.141, no.4, pp.313-323, 2021-04-01 (Released:2021-04-01)

参考文献数

41

被引用文献数

2

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This study proposes a reduction method for iron loss in stator core using the optimum pulse pattern for a high-speed interior-permanent-magnet-synchronous-motor (IPMSM). In this paper, a simple evaluation function for iron loss of stator core in a pulse-width-modulation (PWM) drive is introduced. In particular, the iron loss in stator core is approximately estimated from the flux level obtained from the integral of the line-to-line voltage of the PWM drive. In addition, the pulse pattern is optimized to reduce the iron loss in stator core based on the introduced evaluation function. To validate the evaluation function, the correlation coefficient between the evaluation value and the measured iron loss is calculated in 12 random pulse patterns applied to the inductor and IPMSM. As a result, the correlation coefficients are 0.991 and 0.982 in the inductor and IPMSM, respectively. In addition, the iron loss of the IPMSM with the optimum pulse pattern is reduced by 8.5% and 3.7% in comparison with a carry-asynchronous PWM and carry-synchronous PWM, respectively.

著者

桐淵 岳 財津 俊行 土井 昌志 日下 佳祐 伊東 淳一

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.140, no.3, pp.184-193, 2020-03-01 (Released:2020-03-01)

参考文献数

27

被引用文献数

5

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Servo drive motor systems using PWM inverters have become very popular in the industrial market owing to their excellent control over torque, speed and position. Recently, problems of EMI noise and complexity of wiring from 3-phase PWM inverter power line cables have become critical issues in factories. In addition, using the regenerative energy of a motor has become important. A DC bus system can be a solution to these problems and demands. However, the DC bus system for servo drives has a risk of system instability because of interference between the DC bus and the servo drives. In this paper, an impedance-based stability analysis method is proposed that can predict the stability by only using the I/O (impedance) characteristics instead of all the system properties. The experimental results show that this method is useful.

著者

伊東 淳一 藤井 崇史 星野 哲馬 小高 章弘 佐藤 以久也 田中 大輔

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society (ISSN:09136339)

巻号頁・発行日

vol.128, no.8, pp.1005-1012, 2008-08-01

参考文献数

12

被引用文献数

4 9

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This paper proposes analysis a dead-time error voltage compensation method with a disturbance observer for vector control, and analyses the proposed method. The dead-time compensation is very important to improve performances in the low speed region. The proposed compensation method is composed in the d-q rotational frame with the disturbance observer. As a result, a disturbance transmission characteristic becomes same as a high-pass filter. Then a stability of the proposed controller is hardly affected by controller parameters. In this paper, the validity of analysis is confirmed by experimental results under some conditions. The experimental results are similar to analyzed characteristics and indicate a validity of the analysis results.

著者

東 淳一

出版者

流通科学大学

雑誌

基盤研究(C)

巻号頁・発行日

1995

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東京大学医学部製作による音声分析システム「音声録聞見」により生成される基本周波数(以下F0)およびパワーの数値データを利用した定量的韻律分析プログラム、および分析のための前処理として、「音声録聞見」システムにより書き出されるデータファイルの整形および編集を行うプログラムを、Visual C++により開発した(Windows95対応)。韻律分析プログラムには、・F0およびパワーの平均値と分散を求めるプログラム・F0の分布状況を示す散布図をグラフィック表示するプログラム・F0対パワーの相関係数を算出するプログラム・F0の上昇・下降パタンの動態を定量的に示すプログラム・長時間のF0およびパワーの動態をグラフィック表示するプログラムなどが含まれる。さらに、上記のプログラムを利用し、小規模かつ定量的な日本語方言音声の韻律比較研究などを実施した。

著者

日高 洋 米田 成一 安東 淳一

出版者

広島大学

雑誌

基盤研究(A)

巻号頁・発行日

2005

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本年度は,前年度に引き続き,以下について行った。1、gas-rich隕石の分析:多量にガス成分を含んでいる隕石(Kapoeta,Cook101,NWA801,SaU290)について,Sm,Gd同位体,希ガス同位体,の分析を行い,これらの宇宙線照射履歴の詳細について解析した。これらの隕石は銀河宇宙線の他に,低エネルギーの宇宙線による照射の影響を著しく受けている可能性が示唆された。2.炭素質コンドライトのバリウム同位体分析:タイプの異なる6種類の炭素質コンドライト隙石(Orgueil,Mighei,Murray,Efremovka,Kainsaz,Karoonda)について酸による連続溶出実験を行い,得られた各々のフラクションのバリウム同位体分析を行った。特に,3種類のCM隕石から得られた同位体変動を総合的に解析し,原始太陽系の同位体不均一に影響を及ぼす要因としてs-過程,r-過程の原子核合成成分以外に消滅核種^<135>Csの存在の可能性を検証した。3.原始惑星における水質変成:水質変成を激しく受けている形跡のある狭山隕石(CM2)について,その組織からコンドリュールを採取し,個々のコンドリュール粒子についてバリウム同位体測定を行った結果,^<135>Cs-^<135>Ba壊変系の著しい乱れを示すデータを得た。本研究結果は同位体化学的見地から水質変成の存在を示唆する有意義な証拠となり得た。

著者

伊東 淳一 佐藤 以久也 大口 英樹 佐藤 和久 小高 章弘 江口 直也

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society (ISSN:09136339)

巻号頁・発行日

vol.124, no.5, pp.457-463, 2004-05-01

被引用文献数

62 73

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This paper proposes a novel control method based on the virtual AC/DC/AC conversion for the matrix converter. The virtual AC/DC/AC conversion method is a very simple strategy to control the input current and the output voltage for the matrix converter. There are two new topics proposed in this paper. Firstly, this paper proposes the minimum switching loss modulation on the virtual rectifier. In case of the proposed modulation, only two arms switching in the virtual rectifier using dc link current control by the virtual inverter can obtain clean sinusoidal input current. Secondly, a novel lean controlled carrier modulation on the virtual inverter is proposed. The leans of the triangle carrier are controlled by the duty ratio of the rectifier side pulse. The lean controlled carrier reduces harmonic distortion of the input current by avoiding interference between the rectifier control and the inverter control. These new proposals are confirmed by simulation and experimental results.

著者

富岡 尚敬 安東 淳一

出版者

岡山大学

雑誌

基盤研究(C)

巻号頁・発行日

2008

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高温・高圧・高酸素分圧が惑星物質に与える鉱物学的影響を調べるため,石質隕石の高温酸化実験と衝撃回収実験を行った.この結果,1)鉄に富むカンラン石の酸化による超構造への相転移と赤外スペクトル変化との関連性,2)1万気圧程度の弱い衝撃の加熱においては,含水鉱物の脱水反応は顕著ではないこと,を明らかにした.また,石質隕石の主要鉱物である斜長石の静的圧縮実験を行い,3)斜長石の圧力誘起非晶質化は温度及び時間依存性を持つことを,明らかにした