著者

渡辺 和也

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.121, no.1, pp.20-24, 2001-01-01 (Released:2008-07-15)

参考文献数

22

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The Senju (Thermal) Power Station was constructed by the Tokyo Electric Light Company in 1925 as an auxiliary/emergency plant that supplements the needs of the hydroelectric power plants.Since 1929, the company has successfully operated three 25, 000 kVA Turbo-Generators as synchronous condensers at the Senju Power Station. The generators at the Senju Station produce electrical energy for half of the year.For the remaining half of the year, they are disconnected from turbines and run as synchronous condensers. Used this way, these machines perform double duty. One reason for this arrangement was that the greater capacity of the synchronous condenser was required for the high water season.A second was economic benefits.After the success of the Senju Station, more than 40 utility Turbo-Generators in Japan were altered for use as synchronous condensers, and others were designed and constructed specifically for this purpose. The use of Turbo-Generators as synchronous condensers was an original development of the Japanese electric power companies.This note provides an overview of alterations made to the generators at the Senju Station.

著者

Tadao Fujimaki Katsumi Ohniwa Takashi Honda

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Transactions on Electronics, Information and Systems (ISSN:03854221)

巻号頁・発行日

vol.116, no.12, pp.1420-1421, 1996-11-20 (Released:2008-12-19)

参考文献数

2

著者

Kenji Sato Hirokazu Kato Takafumi Fukushima

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.10, no.4, pp.402-410, 2021-07-01 (Released:2021-07-01)

参考文献数

20

被引用文献数

21

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This paper overviews a traction system for Tokaido Shinkansen trains and presents a novel silicon carbide (SiC)-applied traction system of the new generation Shinkansen train, “N700S”, which began commercial service in the summer of 2020. To achieve compactness and weight reduction, N700S's traction system aimed to take advantage of the merits of SiC devices, which have a lower power loss, higher frequency, and a higher current than Si devices, not only in the conversion system but also in the entire traction system. This weight reduction and compactness allowed for flexibility in the design of underfloor equipment of the car body and enabled the realization of a lithium-ion battery self-traction system that could operate catenary-free at low speeds in the event of a power outage. It also contributed toward achieving flexibility by the easy redesign of different configurations of trains such as 8-car or 12-car sets rather than the standard 16-car trains used for the Tokaido Shinkansen, the concept of which is referred to as the “Standardized Shinkansen train”. The continuous introduction of energy-saving Shinkansen trains including N700S has also led to a decrease in Tokaido Shinkansen's energy consumption. This is the first application of an SiC device and a lithium-ion battery to a high-speed train's traction system in the world.

著者

Kyo Kutsuzawa Sho Sakaino Toshiaki Tsuji

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.9, no.5, pp.505-514, 2020-09-01 (Released:2020-09-01)

参考文献数

22

被引用文献数

4

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The robots used in our daily lives come in contact with the environment not only directly, but also through grasped objects and tools. In such cases, the shape of the grasped objects could be unknown or uncertain; thus, the shape must be estimated using information about the contact. However, previous studies could not estimate the shape of the grasped objects without knowledge about the contact environment. In this study, unscented particle filters were used to estimate the contact positions, contact forces, and shape of the tools, simultaneously. In addition, we verified that the proposed method can estimate these characteristics by measuring the force and torque in the robots.

著者

Shotaro Takahashi Keiji Wada Hideki Ayano Satoshi Ogasawara Toshihisa Shimizu

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

pp.21006800, (Released:2021-08-13)

被引用文献数

11

---

The switching frequency of power converters is continuing to increase with the demand for their increased power density. Therefore, the frequency band of the electromagnetic interference (EMI) generated by power converters ranges from several kilohertz to 100 MHz or more, thereby increasing the importance of EMI countermeasures in power converters. In addition, with the practical applications of smart grids and microgrids and the introduction of 5G technology, cases wherein power converters and information communication devices are placed in close proximity are continuing to increase. Thus, in societies wherein power converters and information communication devices are highly integrated, it is necessary to ensure electromagnetic compatibility based on a different concept. This paper presents a review on modeling and suppression techniques for the EMI generated by power converters and discusses future prospects in this field.

著者

前田 満 大日 向敬 葵木 智之 赤塚 重昭 川上 峰夫 佐藤 博道 一ノ 倉理

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.122, no.4, pp.561-570, 2002-04-01 (Released:2008-12-19)

参考文献数

8

被引用文献数

10 13

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EIE-core type variable inductor is the equipment of variable inductance, which is controlled by dc current. This device controls the cancellation effect of AC magnetic flux. Accordingly, the device always keeps the flux density on the magnetic path within a saturation flux density on control-mode. And, the device cancels a high harmonic distortion, does not need the gaps, which reduce a distortion. Therefore, the device is simply structured, and is easily to scale up. This paper describes a basic structure, basic characteristics (exciting, distortion, ...etc.), and examples of application for the electric power equipment.

著者

板倉 栄治

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. B (ISSN:03854213)

巻号頁・発行日

vol.98, no.3, pp.282-288, 1978-03-20 (Released:2008-12-19)

参考文献数

4

著者

木村 友香 愛甲 貴広 岩谷 祐 岩部 智 柴田 昌明

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会誌 = The journal of the Institute of Electrical Engineers of Japan (ISSN:13405551)

巻号頁・発行日

vol.125, no.12, pp.776-779, 2005-12-01

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本記事に「抄録」はありません。

著者

関本 正直 中村 茂 望月 靖文 戸田 伸一 高原 英明

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.116, no.7, pp.749-757, 1996-06-20 (Released:2008-12-19)

参考文献数

7

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Induction motor drive with inverter control, which can reduce the total weight of the system, has been introduced to the Shinkansen trains in order to achieve high speed transportation.The individual-motor-control type 953 train, which is a part of the STAR21 prototype Shinkansen for high speed experimental run, was used for measurement running, in which we observed wheel slip and adjusted re-adhesion control parameters at the speed of 200 to 300km/h. It was found that the slip detection within one percent speed difference from the reference, was possible by adopting sensitive detecting method. Quick torque reduction by sudden reduction of motor current was necessary for re-adhesion control, and one-second waiting time before re-applying current was also inevitable. For re-applying the current, an exponential curve with four-second time constant was proved to be effective.By these tests, high speed performance and re-adhesion characteristics improvement by adjusting control parameters were obtained. To the next step, for example creep control, which utilizes fine continuous slip, should be investigated in order to keep enough torque minimizing current reduction during re-adhesion control.

著者

小林 輝雄 藤橋 芳弘 円谷 哲男 佐藤 純一 大浦 泰 藤井 保和

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.117, no.5, pp.609-615, 1997-04-20 (Released:2008-12-19)

参考文献数

15

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In Japan speed tests in 300km/h region have been carried out since Oyama Test Line recorded a 319km/h run in 1979. Meanwhile TGV recorded a 515.3km/h run by an electric locomotive installed with a pantograph in 1990 and ICE did 406.9km/h using similar train in 1988. High speed current collection tests over 400km/h using electric railcars have been desired in Japan. Problems of high speed tests are: train speed approaching wave propagation velocity, multi-pantographs resonance, and too large uplift of contact wires caused by lift. It is necessary to keep wave propagation velocity of contact wire higher than train speed. CS contact wire and TA contact wire were compared in high speed tests because it was impossible to get a good current collecting performance by using hard-drawn copper contact wires. In December, 1993 using these contact wires we carried out high speed running tests of 400km/h region on Jyoetsu Shinkansen with the test train STAR 21 which JR EAST built for high speed tests. This paper gives the current collecting performance of these contact wires predicted by simulation and running tests at 425km/h.

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

林 勲

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.113, no.7, pp.466-473, 1993-07-20 (Released:2008-12-19)

参考文献数

28

著者

明日 香昌 駒谷 喜代俊

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.121, no.1, pp.68-75, 2001-01-01 (Released:2008-12-19)

参考文献数

11

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For train simulations, there is a well-known train movement model. By using the model, the precise running status of a train at the designated values for the velocity, position, and time, must be obtained to analyze the train movement in detail. However, conventional simulation methods cannot calculate the precise status at the designated value, because they only calculate the running status discretely at fixed interval. To resolve this problem, we propose a simulation method that has two features. First, the method utilizes integral formulas. An expression of velocity is formulated that directly gives the precise running status at the designated velocity. With the expression, we can also formulate expressions for position and time. Second, since the designated values for the three variables are given at one time, we build a framework that contains the above three expressions and performs the calculations in the appropriate order to get the running status corresponding to a designated value firstly fulfilled. The proposed simulation method calculates the required running status without considering errors introduced by the method itself. It also uses a smaller number of calculations than conventional methods. The proposed simulation has various uses from planning to control of railways to which the conventional method has been applied.

著者

竹内 伸直 中鉢 憲賢 成田 憲一 本間 規泰 高橋 忠利

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.116, no.6, pp.719-724, 1996-05-20 (Released:2008-12-19)

参考文献数

8

被引用文献数

3 3

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To examine the possibility of electromagnetic precusor preceding an earthquake the vertical earth potential difference (EPD) has been observed continuously at an urban area. Iregularily continued pulses had been observed for several hours before and after the Off East Hokkaido earthquake. We have referred both a series of signals of the terrestrial magnetism and the lightning location (LLP) map. No significant signal is recognized on those of terrestrial magnetism, however, severe lightning flashes occured over the Japan Sea at this time. To clarify the cause of the EPD pulse signal, the LLP map and the radar echo map are shown in the case of (a) near lightning flashes (b) far lightning flashes (c) the Off East Hokkaido earthquake. The signals in the cases of (b) and (c) are similar, therefore, the pulses are detected by the far lightning electromagnetic change. The LLP map must be referred to examine electromagnetic precusors of an earthquake. The EPD signal generated by propagating seisamic wave is also recorded.

著者

植杉 通可 金澤 秀俊 蛭間 淳之 宮崎 浩 神戸 崇幸

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.119, no.5, pp.592-598, 1999-05-01 (Released:2008-12-19)

参考文献数

8

被引用文献数

8 10

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The active-filter is one of the most efficient methods to improve power factor. However, this method has problems such as increasing switching loss and switching noise.This paper describes a new power factor correction (PFC) converter called “Partial-switching PFC”, which achieves power factor rate of 99% only by generating a single pulse in the power line cycle with high efficiency and low total harmonic distortion. Its application to our air-conditioners is described at the end.

著者

Tetsuro Akagawa Sho Sakaino

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.12, no.1, pp.26-32, 2023-01-01 (Released:2023-01-01)

参考文献数

27

被引用文献数

2

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Recent research in the field of robotics has primarily focused on motion generation methods using imitation learning to adapt to various environments. Human-level speed motion can be imitated by combining imitation learning with bilateral control. In this approach, prediction errors accumulate in the leader because this method requires a leader state that does not exist during autonomous operation. This issue is caused by the low-frequency prediction error of the leader's responses during autonomous operation. Therefore, this paper describes a training model for predicting a leader's state by eliminating low-frequency prediction errors during autonomous operations. The proposed training model predicts the high-frequency state of the leader-follower differential. Because the low-frequency of the leader is not included in the information input and output of the proposed training model, the low frequency prediction error of the leader does not occur during autonomous operation. During our analysis, while writing letters on a paper on a slope, the previous training model failed to write letters when the paper position moved away from the robot. By contrast, only the proposed training model achieved writing at all positions in the experiment.

著者

赤木 泰文 金澤 喜平 藤田 光悦 難波江 章

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. B (ISSN:03854213)

巻号頁・発行日

vol.103, no.7, pp.483-490, 1983-07-20 (Released:2008-12-19)

参考文献数

10

被引用文献数

7 9

著者

森本 茂雄 河本 啓助 武田 洋次

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.7, pp.722-729, 2002-07-01 (Released:2008-12-19)

参考文献数

12

被引用文献数

21 20

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In most variable-speed drives of PMSM, some type of shaft sensor such as an optical encoder or resolver is connected to the rotor shaft. However, such sensor presents several disadvantages such as drive cost, machine size, reliability and noise immunity. Therefore, the sensorless control of PMSM is desired and various sensorless control strategies have been investigated. This paper presents a novel sensorless control strategy for an interior permanent magnet synchronous motor (IPMSM). A new model of IPMSM using an extended electromotive force (EMF) in the rotating reference frame is utilized in order to estimate both of position and speed. The extended EMF is estimated by the least-order observer, and the estimation position error is directly obtained. The proposed scheme corrects the estimated position and speed so that the estimation position error becomes to be zero. The proposed system is very simple and the design of the controller is easy. Several drive tests are carried out and the experimental results show the effectiveness of the proposed sensorless control system.

著者

Yuki Shimizu Shigeo Morimoto Masayuki Sanada Yukinori Inoue

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.10, no.5, pp.554-563, 2021-09-01 (Released:2021-09-01)

参考文献数

19

被引用文献数

7

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Interior permanent magnet synchronous motors (IPMSMs) have been widely used as traction motors in electric vehicles. Finite element analysis is commonly used to design IPMSMs but is highly time-intensive. To shorten the design period for IPMSMs, various surrogate models have been constructed to predict relevant characteristics, and they have been used in the optimization of IPMSM geometry. However, to date, no surrogate models have been able to accurately predict the characteristics over the wide speed range required for automotive applications. Herein, we propose a method for accurately predicting the speed-torque characteristics of an IPMSM by using machine learning techniques. To improve the prediction accuracy, we set the motor parameters as the prediction target of the machine learning methods. We then used the trained surrogate model and a real-coded genetic algorithm to minimize the volume of the permanent magnet and showed that the design time can be significantly reduced compared with the case where only finite element analysis is used.

著者

河合 洋一 井上 節夫

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.121, no.1, pp.35-38, 2001-01-01 (Released:2008-12-19)

参考文献数

4