著者

陳 志謙 冨田 睦雄 千住 智信 道木 慎二 大熊 繁

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.118, no.7-8, pp.828-835, 1998-07-01 (Released:2008-12-19)

参考文献数

7

被引用文献数

8 7

---

The equation of brushless dc motors is nonlinear, to which linear control theories are difficult to apply. In this paper, firstly, a disturbance observer to estimate rotor positions is proposed. By assuming the non-linear term of the e. m. f. as a kind of disturbance, the model of the brushless dc motors becomes a linear one so that the disturbance observer can be applied. Secondly, a velocity estimator using the e. m. f. estimated by the disturbance observer is proposed. The observer and estimator are 2nd-order systems. Thus they are simple and easy for tuning. Their pole assignments and influences of parameter deviations are also discussed. The experimental results show that the proposed method is valid.

著者

楊 耕 富岡 理知子 中野 求 金 東海

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.113, no.5, pp.579-586, 1993-05-20 (Released:2008-12-19)

参考文献数

11

被引用文献数

34 63

---

A permanent magnet synchronous motor can be controlled as a DC brushless motor, for which the position sensor is needed for detecting the rotor position. In this paper, the research on speed control system without position and speed sensors is reported, where the rotor position and speed of the motor are estimated by means of an adaptive observer. To make the state equations linear, two new state variables are introduced. Consequently, based on the Iinear control theory, an adaptive observer is designed by which the estimated speed and position are converged to real ones. The system is verified to be asymptotically stable. The operation of the system at zero speed and the effects of the mismatched parameters used in the observer are also discussed. Finally, the speed control of the system is implemented. The computer simulation and the experiments show that the system is valid.

著者

Masashi Hayakawa

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.126, no.4, pp.211-214, 2006 (Released:2006-07-01)

参考文献数

5

被引用文献数

3 10

---

Electromagnetic phenomena are recently found to take place prior to an earhquake, and they are regarded as the most promising candidate for short-term earthquake prediction. This report reviews the recent findings on seismo electromagnetic phenomena, including ULF emissions, seismo-atmospheric and -ionospheric perturebations, Earth's surface temperature anomaly, in-situ observational results etc.

著者

松本 義弘

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.129, no.2, 2009-02-01

被引用文献数

1

---

本記事に「抄録」はありません。

著者

Yusuke Ozawa Kosuke Oiwa Shunsuke Miyazaki Seiya Nishimura Yasushi Nanai Akio Nozawa

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.140, no.7, pp.769-774, 2020-07-01 (Released:2020-07-01)

参考文献数

19

被引用文献数

4

---

Long-term and continuous vital sign monitoring is essential for the early detection of hypertension. Blood pressure sensing based on non-contact biological measurement indices such as photoplethysmograms and skin temperature that can be obtained using visible light and infrared images has been attempted in previous studies. Near-infrared light has high transmissivity to living tissues and has been used for measuring arterial oxygen saturation. This study aims to improve the accuracy of non-contact blood pressure sensing using near-infrared light.

著者

藪田 哲郎 松本 俊明 根岸 幸康

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.100, no.3, pp.137-144, 1980-03-20 (Released:2008-12-19)

参考文献数

5

著者

山村 昌

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.10, pp.1197-1204, 1997-09-20 (Released:2008-12-19)

参考文献数

15

---

The spiral vector method was applied to analysis of the synchronous machine with saliency, to derive analytical solutions of electromagnetic transients of the machine by introducing the new idea of damped inductances. Sudden three phase short circuit currents were calculated with the solutions by making use of the measured inductances and they were compared with test result. Good agreement was obtained between the analysis and the test for the first time in the long history of the synchronous machinc.

著者

泉田 喜一郎 椎屋 和久 高橋 洋海 デルウィシュ サラハ

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.3, pp.498-505, 2002-03-01 (Released:2008-12-19)

参考文献数

13

被引用文献数

1 1

---

This study is concerned with detection of objects in motion from time serial pictures of a 6-D. of freedom motion monocular camera. As a point in real space throw an image on corresponding pixels of time serial pictures. So to solve this problem to find out the corresponding algorithm is essential. In this paper we proposed a new method of the detection of motion objects based on compensating background image shift caused by camera rotation and translation. The main point of this idea is, to take two pictures by the passive sensor (CCD camera) in two different times tk and tk+_??_ while the platform is moving, by correcting them rotationally (also called vertical rectification) the rotation disparity will be excluded, and we get two parallel frames that will be matched through their histograms for the translation-distortion extraction.

著者

斉藤 制海 梅野 孝治 阿部 健一 桑原 耕治 前川 明寛

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.2, pp.89-96, 1989-02-20 (Released:2008-12-19)

参考文献数

9

著者

高村 芳雄

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.108, no.4, pp.252-259, 1988-04-20 (Released:2008-12-19)

参考文献数

6

被引用文献数

1 1

著者

Ayaka Masaki Kent Nagumo Kosuke Oiwa Akio Nozawa

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.140, no.3, pp.409-410, 2020-03-01 (Released:2020-03-01)

参考文献数

3

---

A large number of traffic fatalities are caused by falling asleep at the wheel. Several drowsiness detection technologies have been developed in recent years. A previous study describes how hemodynamics can vary significantly due to drowsiness. However, it was difficult to estimate drowsiness from the time series of hemodynamics. In this study, general models for estimating three drowsiness levels (i.e., high, medium, and low) based on hemodynamics were constructed using a convolutional neural network for detecting the condition before a state of complete sleepiness is reached, the goal being traffic accident prevention. The results showed that the accuracy of the model was 68.9%.

著者

藤本 康孝

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.9, pp.918-927, 2002-09-01 (Released:2008-12-19)

参考文献数

24

被引用文献数

2 2

---

A systematic design methodology for discrete control systems is proposed, which is based on Galois field and Gröbner basis. The controller can be automatically designed using a model of the controlled plant. The controlled plant is represented on Galois field. Then the inverse function of the plant is derived using Gröber basis so that the input variables are explicitly obtained as the function of the state variable and reference variable. An illustrative example of a material handling system is shown. The proposed method will realize cost reduction in software development and an improvement of reliability and safety of the PLC based systems.

著者

小川 恭孝 伊藤 精彦

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.116, no.8, pp.671-677, 1996-07-20 (Released:2008-07-15)

参考文献数

18

被引用文献数

2

著者

松本 雅行 河田 智太郎 永次 由英

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.12, pp.1103-1112, 2002-12-01 (Released:2008-12-19)

参考文献数

15

被引用文献数

1

---

Many private railways and municipal railways in Japan use the Automatic Train Control (ATC) system as their train protection system. This system has the function to transmit the permitted speed, determined by the position of the preceding train, through the track circuit and indicate that speed in the driving cab and the function to apply brakes according to the permitted speed. Since this system applies brakes in several stages until the train reaches a halt, the application and release of brakes at each speed stage causes a loss and it is impossible to shorten the headway between two trains.We have developed a new system where the ground equipment transmits the stopping point only and the train is controlled autonomously based on the stopping point information. This system, called D-ATC hereafter, enables shorter train headways than the existing ATC with multi-stage braking. A prototype of this system was build and tested using an actual train in order to judge whether its commercial use is possible. This paper describes the proposal of D-ATC and results of the test runs.

著者

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.114, no.6, pp.612-615, 1994-06-20 (Released:2008-12-19)

著者

戸倉 規仁 山本 剛 原 邦彦

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.9, pp.799-806, 1992-09-20 (Released:2008-12-19)

参考文献数

10

---

Current sensing function is indispensable to modern intelligent power semiconductor devices to detect whether or not a load is driven at a predetermined power level and/or an overcurrent at the time of overload, in order to protect the load and the power device.In this paper, a new current sensing device technology is presented firstly, in which the operation principle is based on detecting voltage drop through a field effect resistance (FER) consisting of mainly channel resistance in DMOSFET. Our new current sensing device consists of DMOS, FER & voltage sensing cell, and lateral MOSFET operated as a temperature compensation resistor in a same chip. The FER-cell has the same structure as DMOS cell, and lateral MOSFET is electrically isolated from substrate by p-n junction. The accuracy of current sensing is within ±2% in a temperature range from -40 to 150°C.The new current sensing device technology which can be integrated easily into power MOSFETs realizes intelligent power MOSFETs with high accurate current sensing and control in a wide temperature range.

著者

乾 昭文 小林 恒夫 寺西 常治 池田 正己

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.118, no.5, pp.563-572, 1998-05-01 (Released:2008-12-19)

参考文献数

21

---

In this paper, the static electrification phenomena on the dielectric materials by SF6 gas flow were investigated. When pure SF6 gas flows on the dielectric materials at high speed up to 25m/sec, no electrification was observed on the dielectric material surfaces. In case of the flow contained dielectric microscopic particles colliding with dielectric materials, it is confirmed that the SF6 gas flow of speeds above 5m/sec causes the electrification on the dielectric surfaces. The faster the SF6 gas flow, the higher the surface potential of the dielectric material is. Such phenomena of static electrification of SF6 gas contaminated with microscopic dielectric particles were explained to be caused by the friction between the dielectric materials and the dielectric microscopic particles in SF6. The polarity and the magnitude of the surface potential of the material, after flowing the SF6 gas contaminated with dielectric particles, are confirmed by the result of a general friction experiment of the two dielectric materials. It is considered that a well-controlled gas insulated transformer not contaminated with microscopic dielectric particles in SF6 can not generate electrification phenomena.

著者

市川 真士 陳 志謙 冨田 睦雄 道木 慎二 大熊 繁

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.12, pp.1088-1096, 2002-12-01 (Released:2008-12-19)

参考文献数

17

被引用文献数

42 64

---

Salient-pole permanent magnet synchronous motors have been widely used in industrial applications for their high efficiency. To control these motors, knowledge of rotor position and velocity are necessary and expensive sensors have been used to detect these signals. Although many sensorless control algorithms have been developed for cylindrical permanent magnet motors, they cannot be applied for salient-pole machines without any approximation because of the complicated mathematical model, and this may lead to unstable problems. To solve this problem, new extended electromotive force models for synchronous motors have been proposed in this paper. The proposed models have a simple structure integrating position information both in the magnet and in the inductance into one extended electromotive force term. Using these models, no approximation is necessary. Experimental results show that the proposed model and method are valid.

著者

岩路 善尚 福田 昭治

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.7, pp.523-530, 1991-07-20 (Released:2008-12-19)

参考文献数

12

被引用文献数

1 4

---

This paper describes a PWM pulse pattern optimization method using the carrier frequency modulation (CFM) technique. This new technique is aiming at not only reducing the magnetic acoustic noises of the driven motors but also improving the performance of sinusoidal inverters.The PWM pulse patterns are basically controlled so that the time-integral function of voltage vectors in the space vector notation may draw a circular locus. In addition to this, the carrier frequency, practically the sampling frequency for inverter control, of PWM is also regulated so that a performance index (PI), which represents the degrees of achieving objectives, may be minimized. Here two PIs, one is for minimizing the distortion of output currents and the other is for minimizing the torque ripples of driven motors, are discussed respecively.Finally, CFM is implemented using a single-chip microprocessor, and the experimental results demonstrate the validity of the proposed mehtod.

著者

田口 明夫

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.118, no.2, pp.243-252, 1998-02-01 (Released:2008-12-19)

参考文献数

22

被引用文献数

1

---

Track circuit uses rail as a part of the circuit. The purposes of the track ciruit are 1) to detect the train, 2) to transmit signal to the train, and 3) to detect the rail break. There are two types in the track circuit. One adopts insulation joint at the end of the circuit, and the other one is jointless. The insulation joint demands a lot of effort to maintain and control. Furthermore it costs extremely, and it has an insulation material that becomes one of the weak points of the rail track. There are some methods to make a jointless track circuit, but it has several problems. The biggest one is that the border of the track circuits becomes fuzzy. The next one is the interference of plural track circuit signals. Nevertheless jointless track circuit has a big priority. First it does not demand an insulation joint and impedance bonds. Second it is very easy to divide.Jointless track circuits are adopted in the area of the sharp curve where impossible to install insulation joints on the Shinkansen line. Also several conventional lines and private railways adopt this system. Furthermore several European high speed train system also use jointless track circuit. In JR, short distance track circuit for level crossing control is jointless, but normal track circuit has an insulation joint, because there is a law restriction of track circuits border ambiguity. To solve the problem, the author had worked out simple jointless track circuit only with induction coils, which border characteristic is very excellent. Furthermore it does not have a strong frequency characteristic that it can be applied to any kinds of frequencies. In this paper, new type of jointless track circuit is proposed, it is theoretically analyzed, and basic experiments had succeeded that they are reported.