著者

坂本 泰明 柏木 隆行 田中 実 長谷川 均 笹川 卓 藤井 信男

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.129, no.3, pp.342-349, 2009-03-01 (Released:2009-03-01)

参考文献数

17

被引用文献数

5 6

---

One type of braking system for railway vehicles is the eddy current brake. Because this type of brake has the problem of rail heating, it has not been used for practical applications in Japan. Therefore, we proposed the use of a linear induction motor (LIM) for dynamic braking in eddy current brake systems. The LIM reduces rail heating and uses an inverter for self excitation.In this paper, we estimated the performance of an LIM from experimental results of a fundamental test machine and confirmed that the LIM generates an approximately constant braking force under constant current excitation. At relatively low frequencies, this braking force remains unaffected by frequency changes. The reduction ratio of rail heating is also approximately proportional to the frequency. We also confirmed that dynamic braking resulting in no electrical output can be used for drive control of the LIM. These characteristics are convenient for the realization of the LIM rail brake system.

著者

中野 孝良 岩金 孝信 赤木 泰文

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.1, pp.1-7, 1994-01-20 (Released:2008-12-19)

参考文献数

26

被引用文献数

1 1

著者

持永 芳文 小山 義夫 竹内 竹次

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.110, no.5, pp.570-579, 1990-05-20 (Released:2008-12-19)

参考文献数

10

被引用文献数

1 1

---

Auto-transformer feeding system is standard equipment for power supply to high-speed trains and prevention of inductive interference with the telecommunication lines on the AC electrified Shinkansen lines in Japan.In the present AT feeding system in which the feeder side of the feeding transformer is not grounded, the insulation level on the feeder side at the substation is set twice as high as the vehicle voltage.For the purpose of economizing on the substation power system, the authors have developed new methods adopting a three-winding Scott-connected transformer to make the insulation level on the feeder side a half of the present value and additionally employing a series capacitor with a simplified structure to compensate for the voltage drop.This paper describes the structure and characteristics of the three-winding transformer, and insulation level reduction method using it.Specifically various features of the system are discussed through simulation of feeding performance by multi-circuit networks analysis and study of various phenomena under use of the series capacitor.Furthermore by confirmation tests executed in the Osaka area of the Tokaido Shinkansen line, the practical applicability of the system is proved.

著者

松井 信行 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.118, no.6, pp.685-690, 1998-06-01 (Released:2008-12-19)

参考文献数

38

被引用文献数

22 32

著者

沼野 稔夫 仲津 英治 木俣 政孝

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.114, no.6, pp.608-611, 1994-06-20 (Released:2008-12-19)

被引用文献数

1 1

著者

堤 雄飛 小田 篤史 前川 景示

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.11, pp.800-807, 2022-11-01 (Released:2022-11-01)

参考文献数

34

---

At present, there is a growing demand for energy saving to prevent global warming. Thus, the railway industry is also focusing on energy saving methods. Power consumption of running trains has a large variation of approximately 20% caused by drivers' operation. Therefore, improving the running profile can considerably reduce energy consumption. Numerous algorithms for generating energy saving running profiles have been researched and developed. To adapt energy saving operation to various environments, we developed a technology that maintains punctuality without reducing the energy efficiency when temporary differences occur in driving conditions. We propose a method that determines the re-creation command point to complete the re-creation at the switching point of the driving operation in the existing energy-saving target pattern, to achieve both punctuality and ride comfort. As a result of verifying the effect of the proposed method on the conventional method via a simulation, it was confirmed that the proposed method can prevent the increase in the number of operation changes when the driving conditions change, whereas the conventional method increases the number of operation changes.

著者

小山田 将亜 國松 禎明 水本 郁朗

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.11, pp.859-865, 2022-11-01 (Released:2022-11-01)

参考文献数

10

被引用文献数

1

---

When designing electric motors, many types of performances (electrical and mechanical characteristics) must be predicted with good accuracy. In general, these performances are determined based on complex theoretical calculations, but theoretical calculations include various assumptions. Therefore, it is difficult to eliminate prediction errors when predicting performance, and it is necessary to improve accuracy by referring actual test data. Recently, with the digitalization of the manufacturing process, a large amount of actual data has been converted into a database, and it is expected to be put to effective use. Here, a neural network that predicts various performances of electric motors using a large amount of actual data as a training dataset, is constructed to achieve uniform and high-precision performance prediction via deep learning. Its practical use for actual design work is verified in this study.

著者

綿引 正倫 赤津 観

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.11, pp.835-844, 2022-11-01 (Released:2022-11-01)

参考文献数

14

---

It is known that the harmonic current of a motor affects torque ripple. Therefore, to take into account the harmonic current in finite element analysis, the voltage input needs to be evaluated however, voltage input analysis is more time-consuming than current input analysis. In this paper, we propose a method to predict the harmonic current and torque ripple of the voltage input analysis of the sine wave by only using the result of the current input analysis of the sine wave in the surface permanent magnet synchronous motor.

著者

武居 直行 古荘 純次 岩越 邦男

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.123, no.2, pp.149-155, 2003 (Released:2004-03-31)

参考文献数

24

被引用文献数

5 4

---

Most Industrial robots are driven through reduction gears such as harmonic drives and RV gears. Since the exibility of the drive system, the vibratory behavior is caused duringthe operation. When the exibility is considered, the drive system of the robot joint can be modeled as a resonant mechanical system called two-inertia system. Two-inertia systems are the vibratory systems that have poles on/near the imaginary axis. Acceleration feedback and torque feedback are known as the vibration control methods of two-inertia systems. In this paper, we consider the two-inertia system with the feedbacks of motor-acceleration, load-acceleration and torsion-torque. It is shown that each feedback works to control the inertia-ratio of two-inertia system. Then, the control performances are compared. Torsion vibration in robot joint, which occurs owingto the accuracy of components and assembly error of gears at a certain speed of rotation, becomes a problem. In order to suppress the torsion vibration, each feedback is applied to the robot arm. As a result, the torsion vibrations are suppressed e ectively.

著者

川路 茂保 小笠原 健一

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.116, no.4, pp.435-440, 1996-03-20 (Released:2008-12-19)

参考文献数

14

被引用文献数

1 2

---

Genetic Algorithms (GAs) are powerful and usable algorithms for the nonlinear optimization problem, and some studies of application of GA to the control problem were reported. The search process of GA depends on the fitness value which is assigned to each candidate solution by the fitness function. But as the control objective is more complicated, the design of the proper fitness function becomes more difficult.In this paper, we propose a new search method of GA which reduces the difficulties of the design of the fitness function. In our method, the control objective is divided into some intermediate objectives according to the control strategy, and the search process of GA proceeds with the fitness function for the intermediate objective. The search process is controlled by switching the fitness function based on the average fitness value of the current candidate solutions so that the optimum solution is found. Thus, the search space is structured by using the fitness function and the structure is changed by switching the fitness function based on the quality of the current candidate solutions. In order to confirm the availability of the proposed method, the swing-up control problem of a pendulum is used as an application example and the simulation results are given.

著者

長谷川 勝

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.138, no.12, pp.NL12_16, 2018-12-01 (Released:2018-12-01)

参考文献数

3

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

角濱 文隆 高木 亮

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.4, pp.232-238, 2020-04-01 (Released:2020-04-01)

参考文献数

7

---

Soft coupling is a conceptual system in which two or more train sets on the same railway track can run like one long mechanically coupled train set, with very little space between the adjacent train sets. It is expected to open up possibilities for the realization of highly flexible and improved rail services. However, it is known to be very difficult for two separate train sets in motion to complete soft coupling, i.e., for the distance between these train sets to become zero. In the method we proposed in our previous papers, the time required for the completion may be infinite, because the train set that follows another must run faster when approaching the train set in front. This paper focuses on the method of completing soft coupling within finite time. We show that such a method can be proposed under the following set of preconditions: (1) infrastructure enabling the removal of the conservative safety concept of railway signalling called `brick wall' assumption, (2) simultaneous control of two train sets through a very secure wireless communications link, and (3) high-accuracy control of the deceleration of train sets.

著者

髙森 太郎 萬年 智介

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.142, no.6, pp.NL6_9-NL6_10, 2022-06-01 (Released:2022-06-01)

著者

宮崎 敏昌 大瀧 栄 ソムサワッス タンパタラタナウォン 大石 潔

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.123, no.5, pp.525-532, 2003 (Released:2004-03-31)

参考文献数

15

被引用文献数

10 20

---

This paper proposes a realization of motion control based on dynamic torque compensation and two-degrees-of-freedom speed control system. In order to suppress the dynamic torque of robot manipulator quickly, this paper constructs the feedforward torque compensation method based on inverse dynamics calculation on each joint control system.Moreover, the proposed joint control system is constructed by the robust control system based on the state feedback, PI speed controller and feedforward controller.The proposed method can suppress the influence of inertia variation and torsional vibration of joint system quickly and completely.The simulation results and experimental results show that the proposed system well regulates the motion of multi-joint robot and suppresses the torsional vibration.

著者

郭 海蛟 大橋 祐則 一ノ倉 理

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.119, no.11, pp.1337-1344, 1999-11

参考文献数

9

被引用文献数

6 1

---

In recent yeas, various transportation systems have been asked to reduce the energy consumption and so the railway systems are without exception. So far, because the calculation of energy consumption and optimization of the railway systems is so difficult, it is hesitate to consider the effective utilization of the regenerative powers. In this paper, we propose a new simple scheduling method for railway systems that positively utilize the regenerative powers. The main idea is use the areas of the overlap between one train's driving partial and another train's braking partial in a diagram to estimate the regenerative powers. Based on the estimated regenerative powers, we can evaluate some important travel parameters in train traffic scheduling and make up an appropriate train traffic diagram. The simulation results show the proposed method is useful.

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

---

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

---

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.

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.NL3_20, 2022-03-01 (Released:2022-03-01)

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