著者

水間 毅 斉藤 秀俊 天野 武一

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.110, no.5, pp.580-589, 1990-05-20 (Released:2008-12-19)

参考文献数

3

被引用文献数

1

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Among linear motor-driven railways, on-board primary linear induction motor-driven railways (steel wheel supported system and levitated system by conducting magnets) have been putting to practical use. This paper refers to electric field strength and magnetic field strength radiated about by these systems. The results are as follows:(1) Directly reached radio noise radiated by the linear motor car has the 1_??_2 MHz frequency region at most.(2) Radio noise by the linear motor car is similar to that by the VVVF inverter controlled car.(3) Magnetic field strength inside the linear motor car is the largest upon the reactor, but is not larger than the ordinary car.(4) In the inspection pit, just under the linear motor magnetic field strength is larger, but decreases to safety level at some distances due to the large attennuation. With the above-mentioned founding, the conclusion are as follows.(i) Peak envelope detection is the refining method in care of the measurement of electric field strength radiated by electric railways.(ii) It is necessary to establish the united standards on the magnetic field strength inside the electric railway cars.(iii) The characteristics of electromagnetic field are of little difference between the linear motor cars and the ordinary motor cars.

著者

勝田 敬一 古関 隆章 曽根 悟

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.121, no.6, pp.705-712, 2001-06-01 (Released:2008-12-19)

参考文献数

5

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The train service in Japan looses rapidity, comfort and robustness against delays in morning peak hours especially, and it has been a serious social problem. On the other hand, the cost to purchase land for a new track is very high. An efficient train operation is proposed in this paper. The proposed train operation has substantially high rapidity and train density identical to a quadruple-track line, with a novel train scheduling based on full usage of a triple-track line. The significance of the proposed train operation on a triple-track line has been verified based on the calculations of waiting time and boarding time of passengers. Consequently train operators can keep the rapidity, moreover, raise track capacity by operating express and local trains like knitting on triple-track lines.

著者

笠島 善憲

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.111, no.9, pp.725-733, 1991-09-20 (Released:2008-12-19)

参考文献数

9

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We have already announced the design method of the passive attenuator to prevent a high voltage which induced at a crane hook of a large crane used near a medium wave radio broadcasting antenna. But it is very difficult fundamentally to microminiaturize this passive attenuator.In this time, we developed an active attenuator that possible to miniaturize where a negative resistor or a fourterminal amplifier is included. From the result analyzing this crane equipped with an active attenuator theoretically, we show the design method of the active attenuator. In this paper, first the equivalent circuit of the crane equipped with the active attenuator as a receiving antenna is induced. And we show that the attenuated characteristics of the active attenuator by the model experiment accords with the theoretical attenuated characteristics which employ an equivalent circuit under the same condition.

著者

柴田 長吉郎 玉井 秀昭 田中 勤 若松 求

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.110, no.6, pp.370-375, 1990-06-20 (Released:2008-12-19)

参考文献数

3

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In accordance with rapid increase of industrial microwave application on heating, more and more high power microwave sources are required. Among many microwave devices, magnetron is most advantageous in economical point of view. Responding to these requirements, a super high power magnetron with output power of 420kW in CW which will be the largest in the world at this time, objective power being 500kW, was developed. In this paper, the design principle, the construction and the scale of each parts are described. The measured characteristics of the developed device reveal satisfactory.

著者

Shota Miyoshi Wataru Ohnishi Takafumi Koseki Motoki Sato

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.6, pp.1114-1126, 2023-11-01 (Released:2023-11-01)

参考文献数

32

---

Boost converters are key components of DC power conversion used for electric mobility and renewable energy applications. In addition to constant voltage control of the output, variable voltage control has been attracting attention in recent years for high-efficiency drive of loads. However, the dynamic characteristics of boost converters exhibit nonlinear and nonminimum phase characteristics. Therefore, the inverse model for feedforward control is unstable, making high-precision voltage trajectory tracking control challenging. This study aims to present a noncausal and nonlinear feedforward controller to compensate for the nonlinear and nonminimum phase characteristics of the boost converter and to achieve perfect tracking control with respect to the output voltage trajectory. This study also establishes a method for identifying circuit parameters and deriving the time length of noncausal control input for practical implementation. The effectiveness of this control method is demonstrated by experiments using a boost converter.

著者

Yudai Funaki Keiji Wada

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.22006323, (Released:2022-12-02)

被引用文献数

3

---

SiC devices are potential future power devices because of their higher switching speed and lower ON resistance than those of Si devices. Research and development efforts to apply them in medium- and large-capacity power conversion circuits are underway. However, SiC power devices in TO packages, which are general-purpose packages, are difficult to apply in high-current applications owing to their low current ratings. Therefore, increasing the capacity of power devices by connecting them in parallel is being studied. However, the current imbalance during switching due to the differences in device characteristics and variations in parasitic inductance is problem. This study proposed a current-balancing procedure focused on the parasitic inductances around power devices and gate drive circuit implementation. The proposed method was verified by conducting double-pulse tests at 300 V and 200 A.

著者

齋藤 彰一 上原 哲太郎 泉 裕 國枝 義敏

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 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)

巻号頁・発行日

vol.124, no.8, pp.1546-1555, 2004-08-01

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The VPN (Virtual Private Network) technique becomes more and more popular to protect contents of messages and to achieve secure communication from incidents, such as tapping. However, it grow in usage that a VPN server is used on a sub-network in part of an office-wide network. But, a PPTP system included in Windows operating systems cannot establish nested VPN links. Moreover encrypted communication by VPN hides a user of the VPN connection. Consequently, any administrators of network systems can't find out the users of the VPN connection via firewall, moreover can't decide whether if the user is legal or not. In order to solve this problem, we developed a multi step PPTP relay system on a firewall. This system solves all the problems of our previously developed PPTP relay system⁽¹⁾. The new relay system improves security by encrypting through the whole end-to-end communication and abolishing of prior registration of passwords for the next step. Furthermore, transport speed is accelerated, and the restriction of the number of steps on relay is also abolished. By these features the multi step PPTP relay system expands usability.

著者

美多 勉 平田 光男 村田 健一

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.115, no.8, pp.1002-1011, 1995-07-20 (Released:2008-12-19)

参考文献数

9

被引用文献数

7 10

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This paper reviews a disturbance canceling control based on a disturbance observer from the view point of servo controllers and gives several new points of this control methodology. Especially, the extended H∞ control, previously proposed by authors, is proven to be a special type of such a disturbance canceling controller which has an ability to shape the frequency response of the complementary sensitivity function.

著者

杉本 英彦 大野 栄一

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.1, pp.31-38, 1983-01-20 (Released:2008-12-19)

参考文献数

4

被引用文献数

3

著者

石川 貴啓 花岡 遼 濱谷 櫻子 平田 展章

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.135, no.7, pp.413-416, 2015

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1.はじめに 私達の生活はここ150年の間に大きく変化した。産業を支えているさまざまなロボットや,身の回りを明るく照らす電球,また今では私達が当たり前のように使う,テレビ,洗濯機といっ

著者

山田 昭彦

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.32-38, 2001-01-01 (Released:2008-07-15)

参考文献数

51

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Research and development of electronic computers started in late 40's in Japan. After the invention of transistors in the US and parametrons in Japan, laboratories and manufacturers started developing computers using transistors or parametrons as logical elements. Therefore only four vacuum tube computers were manufactured in Japan. These are Electronic Computer at Osaka University, FUJIC of Fuji Photo Film Company, TAC of University of Tokyo and ECL RTC. Though the first generation of computers was rather short in Japan, the technical contribution of the development of vacuum tube computers is valuable. This paper reviews the development efforts of the former two vacuum tube computers, Osaka University's and FUJIC.

著者

松岡 孝一 近藤 圭一郎 小林 芳隆 白石 茂智

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.121, no.11, pp.1176-1184, 2001-11-01 (Released:2008-12-19)

参考文献数

6

被引用文献数

1 6

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In the conventional rail vehicle, traction motor is mounted on the truck frame, and the shaft torque is transmitted to the wheel set via flexible coupling and reduction gearing. The reduction gearing is effective to increase the torque, but gives rise to maintenance, noise and transmission loss. To overcome these problems and simplify the truck structure, we conceived an idea of wheel mounted direct drive traction motor system without the reduction gearing, and started the development.In this system, the traction motor is required to produce more torque and reduce the mass. So we introduced permanent magnet synchronous motor for the first time in the rail vehicle. Here, we propose fundamental structures of the wheel mounted direct drive traction motors, and present a prototype wheel mounted traction motor model, which is manufactured by trial as the first step of the development. We overcame the problem of temperature rise of permanent magnet, through analysis and improvement of the magnetic structure.

著者

奥井 明伸 池田 春男

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.637-644, 1997-04-20 (Released:2008-12-19)

参考文献数

8

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Recently, a neutral point-clamped type inverter (three-level inverter) with large capacity has come to be used in a train, etc. for driving A. C. motor. The three-level inverter has an advantage of being low in harmonics unlike conventional two-level inverter. Moreover, if DC-voltage is at same voltage, a transistor or an IGBT whose switching frequency is high can be used as a substitute for high-voltage GTO thyristor, because the number of switching elements in one arm is double.However, the three-level inverter has a drawback in that the output voltage is not controllable smoothly in the case of output voltage being low. It is because the switching element needs a minimum on-off time; this is especially remarkable with the GTO thyristor whose minimum on-off time is long. In order to avoid operation with this drawback, the three-level inverter frequently adopts a dipola modulation. The dipola modulation adds a bias component to the control signal of output voltage lest the control signal should become low-level, and it generates simultaneously a pulse voltage to cancel the bias component.In this paper, first, the output voltage of a three-level inverter with single phase using dipola modulation is analyzed, then its characteristics of harmonics are made clear. Second, in the case of a three-level inverter with three phases, zero-phase sequence component of harmonics are described. Third, characteristics of harmonics are analyzed in the case of three-level inverter being multiply. Lastly, what are described above are verified by simulation.

著者

Yoshihito Yagyu Satoshi Tsuji Saburoh Satoh Chobei Yamabe

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.125, no.8, pp.656-662, 2005 (Released:2005-11-01)

参考文献数

13

被引用文献数

1

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The apple snail, Pomacea canaliculata, brought to Japan from Taiwan for human consumption in the 1980s, has come to be considered as deleterious for rice cultivation. The snail is unable to injure young rice plants while receiving electric shock because the snail retracts its entire body into its shell and shuts its aperture with its operculum. Electric shock should be applied intermittently to reduce the amount of energy that is wasted when the snail is in its shell made of one of the insulator. The minimum electric shock required for controlling snails and the time required for movement after application of electric shock to determine the frequency of each electric shock were investigated using two methods; vertical and horizontal application of the electrical stimulation. The results showed that there is a strong correlation between the strength of electric shock and the reaction of the snails, and electric shock made snails inactive when it was applied 0.35 A/m2 in the horizontal direction and 0.45 A/m2 in the vertical direction with water of 11 mS/m. A positive correlation was also found between electric shock and the reaction of the snails and shell height. In comparison with larger snails, the smaller snails had higher threshold levels against electric current density because their shorter feet tended to have lower voltage dorp. Moreover, the frequency of electric shock should be chosen the minimum duration for the inactive condition, and it was approximately 10 seconds. Consequently the direction of electric current should be in the horizontal direction above 0.35 A/m2 and the frequency of electric shock should be less than 10 seconds for practical use. However, electric shock would have to be maintained at greater than 0.35 A/m2 because snails might become habituated to electric shock and water in paddy field would have high electric conductivity.

著者

勝野 泰 河崎 善一郎 松浦 虔士

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.111, no.5, pp.496-497, 1991-05-20 (Released:2008-07-15)

参考文献数

5

著者

大塚 元太 袖山 和久 吉田 知史 村中 徳明 今西 茂

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.11, pp.1288-1294, 1996-10-20 (Released:2008-12-19)

参考文献数

10

被引用文献数

2 3

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Today, the technique of virtual reality has become popular in various fields because of its technical progress. We focused on ‘presence’ - one of the three elements of virtual reality, and constructed a simple supporting system for piano education. The virtual world and the real world are overlapped by showing the visual information in this system. The purpose of this system is to use the realistic virtual image as an interface (or tool) of education.The unity of the virtual image and the reality has been done with standing pictures by using, for example, ‘See-through HMD’. In this research, however, we overlapped the virtual image and the real world with moving pictures. The overlapping is accomplished not by using HMD, but by using a half mirror. The virtual hands can automatically play a tune from a score so that learners can choose what they like without instructors. This is one example of the system which has a proven effectiveness.

著者

大島 弘安 関野 真一 安信 誠二

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.109, no.5, pp.337-344, 1989-05-20 (Released:2008-12-19)

参考文献数

13

著者

Masataka Minami Honoka Fukutani Shin-ichi Motegi Masakazu Michihira

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.L22000777, (Released:2022-09-30)

被引用文献数

4

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Unbalanced parameters of the parasitic components in a three-phase inverter cause unbalanced losses in the device. This research focuses on equalizing the device's losses for an unbalanced three-phase inverter. This letter proposes a novel two-phase (2Φ) PWM scheme that uses the variable switching pause period. This letter numerically equalizes the device's losses for the unbalanced three-phase inverter.

著者

渡邉 朝紀 長谷部 武久 井上 博允 東 直哉 香本 芳正 小林 一敏

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.109, no.7, pp.477-482, 1989-07-20 (Released:2008-12-19)

参考文献数

6

著者

Maarten Steinbuch Tom Oomen Hans Vermeulen

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.21006010, (Released:2021-08-06)

被引用文献数

7

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Technology in a broad sense is driven by developments in semiconductor technology, particularly with respect to the computational power of devices and systems, as well as sensor technology. The progress of semiconductor technology has demonstrated an exponential curve since the middle of the previous century, representing Moore's Law. Consequently, it is of utmost importance to bridge the gaps between disciplines in the fields of control, automation, and robotics. Moreover, data-driven approaches need to be combined with model-based design. This will lead to new digital twinning and automated design approaches that provide major opportunities. Furthermore, this necessitates the redefinition of our university system.