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

清水 修 花房 一義 新崎 晃大 郡司 大輔 酒井 優人 池田 広盛 松岡 史倫

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.2, pp.146-154, 2022-02-01 (Released:2022-02-01)

参考文献数

22

---

Laborsaving is a major issue in production. In an automotive production line, a yard that is used as a temporary storage for vehicles before shipping. The vehicle-loading robot that operates autonomously has been proposed to automate the alignment of vehicles in the yard instead of human driving. In this study, the dynamic wireless power transfer system that includes the structure of the roadside for the vehicle-loaded robot is proposed. It is proven that the transmitter coil has enough durability for the load of the robot weight using simulation and actual measurement. It is also shown that the reinforcement bars of the road structure cause considerable eddy current loss even with stainless steel. This is similar to loss by coil resistance. This system achieves a 1.8kW dynamic wireless power transfer with an automated coil detection system and a frequency control system, under factory conditions.

著者

三好 将仁 金丸 誠 安原 裕登 宮内 俊彦

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.2, pp.119-124, 2022-02-01 (Released:2022-02-01)

参考文献数

17

---

Feature values of the current are rapidly becoming online indicators of faults in motors and load equipment. Diagnosis by analysis of the stator currents is called motor current signature analysis (MCSA). Compared with vibration analysis, this method can be applied without sensors, and additional long wiring. MCSA detects incidents peculiar to motors, such as bearing failures and rotor bar faults, before breakdown. In this study, we introduce relationships between the failures and current features. The MCSA sometimes has difficulty in identifying anomalies and there is the possibility of false-positive results; hence, we propose some solutions to these problems.

著者

松原 壱樹 和田 圭二 鈴木 敬久

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.2, pp.95-103, 2022-02-01 (Released:2022-02-01)

参考文献数

41

---

There has been an increasing interest in biological effects owing to magnetic field exposure, because wireless power transfer systems for electric vehicles are expected to be widespread in the 85kHz band. Therefore, it is necessary to develop a magnetic field generator and evaluate the biological effects through experimental verification. In particular, the exposure area needs to be expanded for the development of magnetic field generators to offer sufficient number of exposure subjects. This paper presents the design procedure of a two-winding inductor for expanding the exposure area of a magnetic field generator. Two-winding inductors connected in series and in parallel are shown, and circuit configurations using these inductors are presented. It is revealed through impedance analysis that the difference in circuit parameters restricts the operable frequency band in a magnetic field generator with a two-winding inductor connected in parallel. The two-winding inductor connected in parallel can expand the exposure area to 321% of that of a conventional magnetic field generator. Moreover, the validity of impedance analysis is confirmed through the experimental verification rated at 100V.

著者

稲原 大翔 元井 直樹

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.2, pp.86-94, 2022-02-01 (Released:2022-02-01)

参考文献数

27

---

This paper proposes a search algorithm using particle swarm optimization (PSO) with virtual pheromone for swarm robots. Swarm robots are attracting attention in disaster relief works to search for victims. The search algorithm involves a combination of global and local searching. The conventional search method consists of random walk as the global search and PSO as the local search. However, random walk is not efficient in complex environments. For efficient searching, PSO with virtual pheromone is used for the global search. The virtual pheromone drives the swarm robots to an unsearched area, dose not need map data, and has low calculation cost. In addition, it is not necessary in the proposed method to switch algorithms between global and local searching. The validity of the proposed method was confirmed from the simulation results.

著者

西井 勇輝 矢代 大祐 弓場井 一裕 駒田 諭

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.2, pp.76-85, 2022-02-01 (Released:2022-02-01)

参考文献数

15

被引用文献数

1

---

Contact-force control of propeller-driven systems achieves aerial tasks that require contact motions with objects. Conventional contact-force controllers for propeller-driven systems utilize a contact-force feedback controller. Although the feedback gain should be high to achieve high target tracking performance, a high gain causes a large overshoot. This paper therefore proposes a novel contact-force controller which utilizes an airframe's velocity and an airframe's acceleration. An estimated acceleration and an estimated velocity of the airframe are fed back to the contact-force controller. A rotor angular velocity is utilized to estimate the acceleration. The validity of the proposed controller is verified through frequency analysis, simulation, and experiment.

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

茂木 進一

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.2, pp.135-145, 2022-02-01 (Released:2022-02-01)

参考文献数

28

---

Three-phase voltage-fed inverters are used for numerous applications, such as HEVs, EVs. These inverter systems require further improvements in terms of conversion efficiency, cost, size and reliability. On the other hand, dual inverter systems for open-winding motors are garnering attention. This paper, proposes application of pulse-voltage-injection two-phase pulse width modulation (PWM) scheme to dual inverter systems that drive open-winding motors. From the simulated results, it is confirmed that the voltages and currents in the open-winding motor are of higher quality than those in the conventional three-phase PWM scheme or the reference-shift two-phase PWM scheme.

著者

七澤 風画 芳賀 仁

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.2, pp.125-134, 2022-02-01 (Released:2022-02-01)

参考文献数

12

---

This study proposes a control method for a dual inverter to extend the output speed range of an interior permanent magnet synchronous motor with open-ended windings. The secondary inverter with a floating capacitor for the dual inverter supplies reactive power to the motor. In the proposed method, the reactive power required to drive the motor is calculated using an inductive voltage-limiting ellipse, and the d-axis current reference value and output voltage of the secondary inverter are determined. In the proposed control method, the primary inverter of the dual inverter supplies the effective power to the motor to expand the output speed range. The experimental results indicate that the output speed range is significantly improved and the constant torque region is expanded by approximately 41% compared with that in the conventional method.

著者

近藤 圭一郎 結城 和明

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.125, no.1, pp.1-8, 2005 (Released:2005-04-01)

参考文献数

10

被引用文献数

3 6

---

The Pulse Generators or PGs are equipped to detect the rotor frequency of induction traction motors for the torque control in railway vehicle traction field. Eliminating PGs are preferable from the view points of increasing the reliability of the traction system, reduction of the both initial and maintenance cost and down-sizing induction traction motors. Expecting those merits, we have been studying to apply a sensor less control method to induction traction motor control. Prior to some reports of studies and tests to apply speed sensor-less strategy to railway vehicle traction, we lunched the ideas to apply the speed sensor-less control strategy and results of the studies and the tests. In this paper, we present the novel control method for railway vehicle traction and some results of theoretical study and tests.

著者

戸田 伸一 結城 和明 逸見 琢磨 安岡 育雄

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.11, pp.1314-1320, 2003 (Released:2004-06-18)

参考文献数

3

被引用文献数

2 2

---

We have developed a Re-adhesion control algorithm of traction inverter without any Motor speed sensors. In this paper, we are focusing on anti-slip control performance of this system. The influence of speed estimation delay is considered and a method to improve the delay is shown. Acceleration performance of the proposed system is same level as the one of current drive systems using speed sensors.

著者

熊井 巧 青山 真大

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.1, pp.67-75, 2022-01-01 (Released:2022-01-01)

参考文献数

22

被引用文献数

3

---

This paper presents a new technique for carrier harmonics utilization for field excitations and its experimental demonstration. The system is composed of a permanent magnet rotor structure with a wound-field and concentrated winding stator. An induction coil with a series connected capacitor and a field coil with a rectifier are installed on the rotor. The resonance frequency of the LCR series circuit is set to the carrier frequency. Experiments are conducted and the test results are demonstrated along with the driving characteristics.

著者

土屋 柚樹 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.1, pp.1-8, 2022-01-01 (Released:2022-01-01)

参考文献数

10

---

The switched reluctance motor (SRM) has generated considerable attention because of its lack of magnets and lower cost structure compared to the permanent magnet synchronous motor (PMSM) structure. In addition, SRM can achieve high speed rotation because of its simple structure and high robustness. However, SRM has lower torque density than that of PMSM. To increase the torque density in SRM, a grain-oriented electrical steel sheet (GO) can be applied as the stator and rotor materials. The magnetic characteristics of GO fluctuate depending on the angle between the rolling direction and magnetic flux direction. In a previous research, it was confirmed that three kinds of torques are output when the stator and rotor materials use GO. In this paper, three kinds of torques are explained, and a design concept of an SRM using GO is proposed. In addition, the static and dynamic torque characteristics of the proposed SRM are verified by simulation and experiment.

著者

福間 勝彦 中村 利孝 塚越 昌彦 竹内 活徳 松下 真琴

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.1, pp.26-32, 2022-01-01 (Released:2022-01-01)

参考文献数

24

---

Application of large synchronous motors started in the early 90; currently the synchronous motors (SMs) are being phased out and replaced with getting old, and they are being replaced with larger capacity motors which are installed on the existing motor-mount basement. These larger capacity motors require higher magnetic flux than the conventional motors, which leads to the problem of magnetic saturation in the SMs. It is time consuming to find suitable parameters related to flux for each motor using the conventional SM control method. In this paper, a method to improve the adjustment of flux parameters using a simplified matrix table is introduced.

著者

谷嵜 徹也 上田 浩次 村部 敏彦 野村 英之 鎌倉 友男

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 = 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.133, no.5, pp.558-565, 2013-05-01

参考文献数

12

被引用文献数

1 1

---

Traffic regulations mandate the use of winter tires in the interests of smooth traffic flow during heavy snow days. In this situation, road administrators must visually inspect vehicles to ensure summer tires are not being used on expressways. However misjudgment is unavoidable only by visual inspection and heavy traffic jams eventually occur. To avoid such traffic jams, an automatic tire discrimination system is required. In this report, we propose a simple method of discrimination between summer and winter tires using tire/road noises emitted by running vehicles, and evaluate the relationship between road surface roughness and the impact noise patterns of winter tires. Additionally, we consider the influence of road surface conditions such as dry and wet surfaces on the proposed discrimination method. Finally, we confirm the effectiveness of the discrimination system in the field using a number of vehicles with different tires.

著者

高橋 翔太郎 和田 圭二

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.1, pp.33-40, 2022-01-01 (Released:2022-01-01)

参考文献数

21

被引用文献数

1

---

In this study, the authors propose a simple method for estimating stray capacitance of toroidal inductors. The proposed method calculates the total stray capacitance of a toroidal inductor based on the stray capacitance between the winding and the core, calculated by considering the insulation (plastic case and plastic molding) that contains the magnetic core. The frequency characteristics of the toroidal inductor can be calculated by substituting the calculated stray capacitance in the analytical model of the inductor, which takes into account the frequency dependence of the complex magnetic permeability of the magnetic material. In order to evaluate the proposed method, toroidal inductors were fabricated based on carbonyl iron dust, amorphous and nanocrystalline magnetic cores. Comparison between measured and calculated impedances clarify that the proposed method can calculate the stray capacitance of toroidal inductors with practical accuracy.

著者

高橋 空路 美井野 優 髙木 茂行

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.1, pp.18-25, 2022-01-01 (Released:2022-01-01)

参考文献数

26

---

We propose a new bias torque function control (B-TFC) method for electric vehicles (EVs) for starting on uphill roads and confirm its effectiveness by simulations and experiments. In the simulation, we developed a new model for accurate behavior of the evaluation system. We compared three kinds of slip suppression control methods, namely without TFC, with TFC (conventional), and the B-TFC. In the case of the B-TFC method, an EV carrying one person can start moving on a 1° wet uphill road without rolling backward. In the simulation using the developed model, the torque is suppressed and fluctuates between the command and bias torques. Then, the vehicle speed at 3s is 1.7m/s, which is the highest among the compared methods. The experimental results therefore agree with the simulations and the developed simulation model reproduces the experimental trends with high accuracy. We confirm that the proposed B-TFC method improves acceleration and slip suppression performances.

著者

香取 照臣 泉 隆 高橋 寛

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.116, no.1, pp.79-87, 1995-12-20

参考文献数

5

被引用文献数

2

---

The route guide sign system is one of the route induction system in the road traffic. However, there are cases that some addresses are unfit in the network, on regard to addresses among the route guide sign boards. Sometimes, this system is not kind for drivers. We study for the optimization of the above route guide sign system.<br>One of evaluation methods of route guide sign system is the method using drive simulator. An overall evaluation can be done by using the drive simulator, but each driver's subjectivity are included in the evaluation results.<br>In this paper, we propose the new method of objective evaluation using conditions of appropriate induction addresses for optimization route guide sign system. There are three conditions, induction considering each lines, induction considering direction at crossing point, and continuation of induction addresses on route guide sign board. And we suggest the method to improve these system using the result of its evaluation.<br>Finally, we show an example of above evaluation method and improvement to the route guide sign system at the Northwest CHIBA area.

著者

香取 照臣 泉 隆 高橋 寛

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.115, no.2, pp.157-164, 1995-01-20

参考文献数

8

被引用文献数

3

---

The route guide sign system is one of the route induction system in the road traffic. However, there are partially miss-match notation in the network because it includes contradiction in each notation addresses.<br>Under these background, we are going to study on the method of notation addresses decision for the route guide sign boards, and will evaluate its network.<br>In this paper, we describe the methods of evaluation for the route guide sign system and detection of stray crossing points in a network, using the induction route by drive-simulation. In the method of evaluation, we use the standard induction routes. The standard induction routes are imaginative one by route guide sign system. By comparing the standard route's distance with the result of drive simulation's one, evaluation values are calculated and stray crossing points are detected.<br>By using this method, the route guide sign systems are evaluated in quantity, and the wrong route guide sign boards are likely detected.<br>Finally, we show an application example of this evaluation method and detection of the stray crossing points for the route guide sign systems at the Northwest CHIBA area.