著者

浅野 利郎 萩原 将文

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.122, no.2, pp.217-223, 2002-02-01 (Released:2008-12-19)

参考文献数

30

被引用文献数

1 1

---

In this paper, we propose a new system reflecting user's emotion in a virtual space. In the system, a user inputs his/her emotion using 6 emotional parameters in detail, and he/she chooses some shapes of objects to exist in a virtual space. From these information, the proposed system reflects user's emotion in 6 aspects using fuzzy logic and weighted average calculation. The aspects are 1) an extent of the space, 2) background colors of the space, 3) colors of the objects, 4) size of the objects, 5) moving speed of the objects, and 6) the number of the objects. In the created virtual space, user can go forward, go back and turn as he/she likes. The system is evaluated by objective questionnaires by 13 testees and the effectiveness has been shown.

著者

溝手 宗昭

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.12, pp.1073-1078, 1991-12-20 (Released:2008-12-19)

参考文献数

12

被引用文献数

1

---

The facial temperature alters in such cases as when a human plays exercises, when the ambient temperature changes, or when he feels psychological shock. I attempted to estimate the facial temperature change which was caused by psychological change in the human mind.In room temperature (between 22 and 26°C) facial temperature and heart rate of male students stretching a back muscle dynamometer and playing role in the psychodrama were measured by an infra-red camera. Subjects stretched the dynamometer as quickly and powerfully as possible, and held it for 10 seconds. And a trial was repeated five times every two minutes in an exercise. Facial temperature and heart rate of subjects increased while stretching the dynamometer. The facial temperature of most of the subjects decreased as the trial was repeated and the heart rate of subjects recovered soon after the exercise. But, in 3 of 10 subjects, the facial temperature increased gradually even after the stretching as the trial was repeated and their heart rate also increased. On the other hand, in the psychodrama, increased facial temperature of subjects who experienced psychological shock was kept high for more than 20 minutes. Then heart rate of subjects was not changed.I developed a system which estimated the human psychological change by calculating deviation from the mean in measured data.

著者

Kikuko Miyata Arata Takaki Susumu Hara

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.11, no.3, pp.447-457, 2022-05-01 (Released:2022-05-01)

参考文献数

27

被引用文献数

1

---

There is an increase in the popularity of small spacecraft because they are expected to introduce large opportunities in the space industry. However, there are two issues with increased use of small spacecraft: enhancement of cost-effectiveness and improvement in the mission failure rate. This study defines the battery state as the most important parameter in spacecraft operations because it directly relates to the health status of the spacecraft. We propose solving problems by introducing high-accuracy in situ state estimations for real-time operation mode selection and on-ground future state estimations of the battery in spacecraft operations planning by utilizing a suitable numerical model. The high-accuracy in situ state estimations allow us to minimize operational margins for battery protection, improve the efficiency of each spacecraft, and achieve safe spacecraft operations. The combination of a model-based system development approach and numerical optimization methods helps establish an efficient autonomous mission operations planner system to maximize mission duration. This enables us to reduce the human resource costs for spacecraft operations. This study addresses two topics: battery and spacecraft modeling, and establishing a mission operations planner system. The details of the system and battery modeling considering temperature dependence are explained using parameter identification results from the experiments. The design policy of the mission operations planner, which utilizes the battery status as the threshold of the operations and constraints, is explained via numerical optimization details. Numerical and experimental case studies are performed to evaluate the proposed method and show its effectiveness.

著者

島田 義則 内田 成明 安田 裕彦 本越 伸二 石窪 雄二 河崎 善一郎 山中 龍彦 足立 幹雄 山中 千代衛

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.119, no.7, pp.990-996, 1999-07-01 (Released:2008-07-15)

参考文献数

19

被引用文献数

2 2

---

Study of laser triggered lightning has been conducted at field experiments. The experimental site was constructed at Mt. Dake close to the Japan sea shore in Fukui prefecture. An electron-beam sustained two-beam 1kJ CO2 laser, 500 and 1000-mm diameter Cassegrain type focusing mirrors and a 50-m tall lightning tower were prepared. To produce a plasma channel for leader initiation, a plastic target was set at the top of the lightning tower and irradiated by the CO2 laser. An aerosol plasma channel was also produced from the top of the plastic target. The laser plasma channel successfully triggered a lightning stroke. Rogowski coil current detectors monitored the current growing rapidly and UHF interferometer set on Goichi observation site was detected an UHF radiation from Mt. Dake as same timing as the laser irradiating. The UHF radiation was correlated to the leader initiation both in time and space. Hence, we confirmed the laser triggered lightning.

著者

鈴木 良博 清家 捷二 今井 修 内藤 克彦

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.118, no.10, pp.1158-1165, 1998-10-01 (Released:2008-07-15)

参考文献数

5

---

The semiconducting glaze insulators show excellent electrical performance under contaminated condition. In order to make mass production of such type of insulators, it is first necessary to determine the kind of the materials to develop such a semiconducting property and to decide an optimum resistivity of the semiconducting glaze from practical manufacturing technology point of view.This paper describes the results of a series of investigation into the macroscopic surface resistivity to develop the expected superior electrical characteristics of insulators, the optimization of the volume resistivity of glaze itself, the optimum distribution of volume resistivity of the glaze over the actual insulator surface, etc. The chemical composition of the glaze ingredients and the manufacturing conditions are essential for the resultant glaze characteristics.

著者

畑 正

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.123, no.7, pp.410-413, 2003-07-01

被引用文献数

2

著者

高橋 紹大

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌E(センサ・マイクロマシン部門誌) (ISSN:13418939)

巻号頁・発行日

vol.118, no.11, pp.518-523, 1998-11-01 (Released:2008-12-19)

参考文献数

10

被引用文献数

2 4

---

In order to design and develop electric power apparatus it is important to analyze electrical discharges, and a measurement of an electric field is greatly helpful to it. There are some methods for measuring the electric field. Among them a Pockels sensor is based on an optical method and has many advantages.There is a request to miniaturize a sensor from a view point of spatial resolution. An optical waveguide technique has been successfully introduced in Pockels sensor to achieve the spatial resolution of micrometers.As a senor for measuring electric field in space it must be confirmed about two characteristics. One is limitation of its caliblation in non-uniform fields and the other is its operation with space charges. Pockels sensors except for what in fixed envirornment must be calibrated under uniform field and it is surmised there is limitation. In consideration of discharge measurement charge attachiment on Pockels sensor is inevitable. In this paper these two points are examined.

著者

Maurice Poot Jim Portegies Noud Mooren Max van Haren Max van Meer Tom Oomen

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.11, no.3, pp.396-407, 2022-05-01 (Released:2022-05-01)

参考文献数

74

被引用文献数

8

---

Machine learning techniques, including Gaussian processes (GPs), are expected to play a significant role in meeting speed, accuracy, and functionality requirements in future data-intensive mechatronic systems. This paper aims to reveal the potential of GPs for motion control applications. Successful applications of GPs for feedforward and learning control, including the identification and learning for noncausal feedforward, position-dependent snap feedforward, nonlinear feedforward, and GP-based spatial repetitive control, are outlined. Experimental results on various systems, including a desktop printer, wirebonder, and substrate carrier, confirmed that data-based learning using GPs can significantly improve the accuracy of mechatronic systems.

著者

Masaya Inoue Junji Kitao Yoshihiro Miyama Moriyuki Hazeyama Hitoshi Isoda Hideaki Arita Koji Nishizawa Tatsuo Nishimura Masatsugu Nakano

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.11, no.3, pp.388-395, 2022-05-01 (Released:2022-05-01)

参考文献数

20

被引用文献数

6

---

This paper presents the development of a 48V integrated starter generator (ISG) for mild hybrid vehicles. The motor needs to satisfy power and torque performances requirements under the 48V system voltage as well as the passenger vehicle's specific requirements, such as acoustic noise and layout space. Several processes have been explored to obtain a 48V ISG such as the pole number selection process, the electromagnetic design approach for reducing acoustic noise, and a novel position sensor topology. By using the developed technologies, a 48V ISG motor is designed, built, and tested. Furthermore, the developed motor is demonstrated to achieve 180Nm, 15kW exceeding the 95% motor efficiency with acoustic noise reduction design and thin axial motor length.

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.6, no.6, pp.401-408, 2017-11-01 (Released:2017-11-01)

参考文献数

11

被引用文献数

4 22

---

Nowadays, interior permanent magnet synchronous motors (IPMSMs) are widely utilized as traction motors. The permanent magnets used in IPMSMs are an important factor; thus, high-coercivity permanent magnets with lesser rare-earth elements are in development. This study investigated the performance of IPMSMs typically used in automotive applications modified to contain a strong magnet model (SMM). Rotor models with two permanent magnet arrangements, that is, a V-shaped single-layered permanent magnet structure (Type 1V) and a double-layered permanent magnet structure (Type 2D), were considered in this study. This paper discusses the characteristics of the analysis models based on the results of a two-dimensional finite element analysis. The maximum torques of Types 1V and 2D with the SMMs were approximately the same. In addition, the loss of Type 2D with the SMM was lower than that of Type 1V with the SMM at two evaluation points and under two driving schedules. Therefore, Type 2D was proved to be suitable for use with the SMM.

著者

Yuto Kobayashi Kiyoshi Ohishi Yuki Yokokura Tenjiro Hiwatari Akira Satake

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.11, no.3, pp.494-505, 2022-05-01 (Released:2022-05-01)

参考文献数

19

被引用文献数

1

---

This paper focuses on the voltage modulation method to reduce the switching frequency and proposes a voltage-integral-based reference tracking modulation (VIRTM) method. The proposed method calculates an evaluation function by considering the factors of the switching frequency. Thereafter, the proposed method outputs the voltage vector based on the evaluation function and reduces the switching frequency. The switching frequency of the conventional discontinuous pulse width modulation (DPWM) and that of the proposed VIRTM are evaluated by using simulations and experiments based on feed-forward and feedback control systems. From the results, the usefulness and effectiveness of the proposed method are confirmed.

著者

遠藤 守信 加藤 厚志 上野 秀樹 白石 稔

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. A (ISSN:03854205)

巻号頁・発行日

vol.108, no.7, pp.279-286, 1988-07-20 (Released:2008-06-30)

参考文献数

13

被引用文献数

1 1

著者

Yui Takaki Shirato Wataru Ohnishi Hiroshi Fujimoto Yoichi Hori Koichi Sakata Atsushi Hara

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.21005641, (Released:2021-12-24)

被引用文献数

2

---

Manufacturing equipment often require high-speed and high-precision positioning with long strokes. This study aims to utilize pneumatic cylinders for such equipment owing to their several advantages. One of the challenges in pressure and position control is valve nonlinearity, such as a varying dead zone. While the conventional feedforward dead zone compensation method cannot address variations in valve input-output characteristics, the twin-drive system, a feedback compensation method, can address the variations using a fast-response flowmeter. However, the disadvantage of the twin-drive system is that it is likely to cause saturation and windup. To solve this problem, we propose an anti-windup method for the twin-drive system. Experimental results indicate the proposed method avoids windup and enables accurate tracking control in the difference mode (i.e., mass-flow input to the tank). Moreover, the experimental results reveal that the proposed twin-drive system with the anti-windup structure improves the pressure tracking performance and enhances the pressure control system's linearity compared with those of the conventional feedforward compensation method.

著者

鈴木 宏和 矢野 雅文 田仲 広明 清水 博

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.107, no.11, pp.1027-1034, 1987-11-20 (Released:2008-12-19)

参考文献数

7

著者

藤原 俊輔

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) (ISSN:09136339)

巻号頁・発行日

vol.108, no.5, pp.439-446, 1988-05-20 (Released:2008-12-19)

参考文献数

9

被引用文献数

4 5

著者

川原 敬治 持永 芳文 前川 千明 佐藤 重勝

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.120, no.1, pp.96-103, 2000-01-01 (Released:2008-12-19)

参考文献数

9

---

Railway structures and traction substations suffered much damage by the Large-Magnitude Hanshin-Awaji Earthquake in 1995. In electric railway substations, structures were cracked, also a number of pieces of equipment such as transformers and silicon rectifiers were damaged, insulation oil leaked, base anchorbolts were cut, and high-voltage equipment supports inclined, and insulators cracked because of crack in the ground and uneven subsidence. This report describes the survey results of damaged traction substations and explains an earthquake-proof design method for traction substation equipment.We surveyed natural frequencies of traction substations equipment below 170kV. This survey showed that natural frequencies of equipment below 170kV were in relatively high frequency area (about 10-20Hz) than those of equipment above 170kV. As the real dominant frequency of earthquake is several Hz, these equipments rarely cause resonance due to earthquake move, and moving responses are weak also.From the analysis of the gliding phenomena of heavy equipment, it is found that the horizontal acceleration is in the range of 0.4-0.6G. So anchorbolts should be protected from large bending moment. Definite plans are using longer anchor-sockets, stuffing gaps between equipment and base and removing anti-vibration rubber plates.

著者

大穀 晃裕 中野 正嗣 谷 良浩 山口 信一 都出 結花利 有田 秀哲 吉岡 孝 藤野 千代

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.126, no.1, pp.74-83, 2006-01-01

被引用文献数

10 3

---

The magnetic properties of the magnetic steel sheets, which are used for the magnetic cores of motors, vary with stress. This variation affects the characteristics of motors, e.g. the cogging torque of permanent magnet motors. In this paper, a novel, highly precise motor analysis method is proposed, which consists of the combination of structural analysis and electromagnetic field analysis-that is, the electromagnetic field analysis considering the stress distribution in the stator core. The cogging torque, which arises from the stress by shrink fitting of the frame to the core, is estimated using the proposed method. The validity of the proposed method has been verified by comparing the calculated results to the experimental result. Moreover, the better expression of the stress distribution in the coupled analysis is examined, and the result is that the principal stress is suitable rather than the von-Mieses stress. The reason is that the principal stress can distinguish the magnetic properties under compressive stress from the properties under tensile stress, and it can also consider the magnetic anisotropy caused by the stress.

著者

藤原 俊輔 藤本 健

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.112, no.5, pp.459-466, 1992-05-20 (Released:2008-12-19)

参考文献数

6

被引用文献数

4 5

---

There is a levitation method which uses 8-shape levitation coils arranged on the vertical surface of the guideway. These coils can act as a guidance means as well as the levitation means. The characteristics of this system is examined using numerical examples and experimental data. The cables connecting right and left coils are not connected to a high voltage power source unlike the usual guidance system which is combined with propulsion. Thus the electric insulation of the cables is now not a problem. Numerical examples show that the levitation characteristics of the combined levitation and guidance system is almost the same as in the system without the guidance function, and that it atains reduced running resistance with necessary guidance stiffness obtained. Test run was done at Miyazaki Test Line equipped with coils of this type arranged about 120m, and the results show stable running and balanced displacement which agrees with calculated value.

著者

Hiroki Ishida Tomoaki Kyoden Hiroto Furukawa

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.11, no.1, pp.59-68, 2022-01-01 (Released:2022-01-01)

参考文献数

26

被引用文献数

2

---

In this study, parity-time symmetry (PTS) was applied to a wireless power transfer (WPT) system in the low-frequency range of 30-40kHz. A series-parallel topology was analyzed using the coupled mode theory. It was demonstrated that PTS can be preserved over a long transmission distance even at low frequencies by reducing the self-inductance of the receiver coil. The receiver solenoid coil (dimensions: 71 × 30 × 7.4mm, mass: 45.6g, self-inductance: 119µH) was able to maintain a transmission power of 23±1W and an efficiency of 83±1% within a distance of 12-40mm. In addition, the suitable coil orientation range was significantly increased from ±5° to ±65°. The power conversion efficiency of a switching-mode amplifier based on a class-D inverter reached 97% at low frequency. These results are expected to contribute to the expansion of PTS-WPT applications.

著者

Koji Imai Shinji Doki Kosuke Kondo Yasuaki Aoki

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.11, no.1, pp.27-40, 2022-01-01 (Released:2022-01-01)

参考文献数

30

被引用文献数

2

---

Dual three-phase permanent magnet synchronous motors have the characteristics of multi-phase and permanent magnet synchronous motors, whose double- and decoupled-winding models based on the vector space decomposition have been reported. High-frequency signal injection methods enable position sensorless control, parameter identification, and the search for maximum torque per ampere operating points. However, the current control system with high-frequency signal injection for a dual three-phase permanent magnet synchronous motor has not yet been sufficiently discussed. This study compares the double- and decoupled-winding models for the current control system with the high-frequency signal injection and proposes a current control system with high-frequency signal injection. Furthermore, this study proposes a position sensorless control method at low speed based on the high-frequency voltage injection as an application of the proposed current control system with the high-frequency signal injection. Experiments verify the effectiveness of the proposed current control system with the high-frequency signal injection and the proposed position sensorless control method.