著者

新中 新二

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.140, no.7, pp.550-561, 2020-07-01 (Released:2020-07-01)

参考文献数

17

被引用文献数

1

---

This paper proposes a new torque-sensorless ripple-reduction torque control method for synchronous reluctance motors, which evolve torque ripples depending on the rotor position by the sinusoidal stator current. The proposed method, which requests the construction of a vector control system with a special command converter, has the following attractive features. (a) The average evolved torque matches its torque command. (b) The torque ripple can be considerably reduced. (c) The current command generated from the torque command is on the trajectory for efficient drives. (d) It is analytical and simple. The effectiveness of the proposed method is validated through extensive simulations.

著者

寺家 尚哉 深見 正 小山 正人 満田 宇宙 伊藤 一将 山田 正樹

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.140, no.7, pp.542-549, 2020-07-01 (Released:2020-07-01)

参考文献数

16

被引用文献数

6

---

This paper presents a new type of axial gap motor, called the flux-modulating hybrid field motor (FHM). For flux modulation, the FHM has rotor iron pieces sandwiched between two stators, the armature and field poles. The field poles comprise permanent magnets and electromagnets, and the magnetic flux of the electromagnets can be adjusted by changing the field current. To validate the principle of this FHM, a 0.8-kW prototype machine was fabricated, and the basic characteristics of the prototype machine were investigated through experiments and three-dimensional finite element analysis. The results show that the torque can be varied in a wider range by changing the armature current vector and field current.

著者

杉本 健 保川 忍

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.115, no.1, pp.46-52, 1994-12-20 (Released:2008-12-19)

参考文献数

7

---

We must switch from trucking to trains or ships for freight transportation in view of aggravating environ-ment destruction, depletion of fossil energy resources, and shortage of young manpower.High power electric locomotives have been developed and are contributing an increased freight transporting capacity. But we have to restrict their power output because of voltage drop and shortage of capacity on account of long interval of traction substations. We have studied an adaptive output power control system of them to exploit their full ability with computer simulation. We propose a new method of calculating the difference between the voltage of contact wire of locomotives and its limit, and the resistance of feeding system with the position of the locomotive and traction substation, and calculating the current to be increased within the limit. Otherwise we propose to reduce output power of locomotives according to the difference between voltage of contact wire and its limit. We show that high power locomotives can be worked within the voltage limit and the standard train running time can be maintained by computer simulation proposed in the above. Thus we can introduce the high power locomotives without any large investment to expand the existing substation and can work them to the limit of their capacity.

著者

野下 裕市

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.139, no.9, pp.814-821, 2019-09-01 (Released:2019-09-01)

参考文献数

20

被引用文献数

1

---

This paper proposes a linear PFC regulator with a light flicker compensating circuit for LED lighting applications. The proposed circuit is small in size because it includes no reactors or electrolytic capacitors. The light flicker compensating circuit, which is connected in parallel to the LED string, consists of four ceramic capacitors and diodes. These capacitors are operated in series in the charge state and in parallel in the discharge state by using a diode network circuit. Therefore, an external controller and large capacitors are not required. The proposed circuit is experimentally validated using a 9W prototype. From the experimental results, it is found that the power fluctuation of the LED string is less than the JIS and JLMA limitations, and the power factor is 0.95. In addition, the power loss is analyzed at an efficiency of 89.4% for the prototype circuit. Also, by modulating the current regulator, sinusoidal input current can be achieved. The second proposed circuit is experimentally validated using a 7.5W prototype, and the power factor and input current distortion are found to be 0.999 and 2.1%, respectively.

著者

福田 昭治 依田 武仁

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.12, pp.1440-1446, 2000-12-01 (Released:2008-12-19)

参考文献数

11

被引用文献数

8 19

---

A new current control method based on the internal model principle in control theory is proposed. It uses a sinusoidal internal model, but it does not use any coordinate transformations. The method can be used for tracking an arbitrary number of harmonics, a DC component or a fundamental frequency component signal. It is applied to a single-phase PWM inverter and an active filter. Simulation and experimental results confirm the validity of the proposed method.

著者

中津川 潤之介 岩路 善尚 榎本 裕治

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.136, no.4, pp.263-269, 2016-04-01 (Released:2016-04-01)

参考文献数

23

---

We have developed novel mathematical models of d-axis and q-axis magnetic fluxes ϕd and ϕq for permanent magnet synchronous motors (PMSMs). The models can be used to approximate magnetic characteristics using simple fractional equations with id and iq as variables. They include eight constants, and some of them represent the degree of magnetic saturation and cross-coupling. However, the magnetic characteristics are varied with the temperature rise in PMSMs, which are dependent on the load torque and motor speed. In this paper, the characteristics of the eight constants that vary with the motor temperature and the residual flux density Br are shown. Further, we propose to extend the mathematical models by considering the temperature and Br variation.

著者

針山 隆史 星 勝芳 中村 茂 戸田 伸一 中沢 洋介 高原 英明

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.9, pp.1081-1088, 1998-09-01 (Released:2008-12-19)

参考文献数

15

被引用文献数

3 7

---

Induction motor drive with PWM inverter control, which can reduce the weight of the driving devices, is used for Shinkansen trains in order to achieve high speed transportation.This paper describes the experimental results for controlling wheel slip and re-adhesion at high speed running with the type 953 Shinkansen test train. The induction motor for each axle of this train is individually controlled by an independent PWM inverter. By introducing the vector control for the induction motor drive system, quick response for the motor torque can be achieved when wheels are going to slip. The control scheme for the wheel slip and re-adhesion is that the motor torque is gradually reduced by increasing of wheel slip speed.The results show, it is possible to recover to adhesive condition against wheel slip, without excessive motor torque reduction, when the reducing torque value and control time constant are properly selected.By these tests, re-adhesion characteristics improvement by induction motor vector control are obtained. To the next step, the parallel motor control system with a vector controlled inverter will be investigated.

著者

横山 英二

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.125, no.3, pp.277-285, 2005 (Released:2005-06-01)

参考文献数

5

被引用文献数

4 2

---

A control system which improves playability of optical disk drives is proposed. The system estimates the state variables such as a sensor-less disturbance observer and feeds them back to the controller. This approach improved control performance toward the defects on the optical disk by the feedback control of the estimated velocity. Furthermore, the influence of an acceleration disturbance to act on the drive and the influence of acceleration caused by physical distortion of the optical disk are suppressed by the feedback control of the estimated disturbance. It is proved that, by applying this control system to the tracking servo system of CD players, the control errors against the acceleration disturbance and the radial run-out of the disk were eliminated and that, as a result, abnormal sound skips never occurred on the defective disks. This control system is one of the key technology toward the realization of the high density optical disk drives.

著者

高橋 和彦 山田 孝行

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.3, pp.308-314, 1998-03-01 (Released:2008-12-19)

参考文献数

21

---

In this paper, we propose a heterogeneous hidden layer consisting of both sigmoid functions and RBFs (Radial Basis Functions) in multi-layered neural networks and present a method for implementing the neural network to control systems. Focusing on the orthogonal relationship between the sigmoid function and its derivative, a derived RBF that is a derivative of the sigmoid function is used as the RBF in the neural network, so the proposed neural network is called an ONN (Orthogonal Neural Network) and the function mapping with the ONN can be treated as a kind of an orthogonal function series model. Identification results using a nonlinear function confirm both the ONN's feasibility and characteristics by comparing with those obtained using a conventional neural network which has sigmoid function or RBF in hidden layer. Using the ONN, a parallel type neural controller, which uses both the ONN output and the conventional control output as an objective system control input, is proposed. Simulation results for discrete-time nonlinear SISO system demonstrate the applicability of the neural controller for controlling nonlinear systems and experimental results for controlling angular velocity of a DC servo motor demonstrate its usefulness for controlling practical systems.

著者

楊 中平 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.122, no.2, pp.104-110, 2002-02-01 (Released:2008-12-19)

参考文献数

8

---

It is an important factor for railway services to take proper train rescheduling under disrupted conditions. This paper discusses the rescheduling problem in the case of resumption of train operation, in which the train operation has been temporarily suspended by an accident. The authors propose a novel rescheduling method using selective stops schedule pattern. The proposed rescheduling problem has been formulated as a nonlinear optimization problem, and it has been solved by the simulated annealing method. Finally, the proposed methods are applied to a typical commuter line, and the efficiency of these methods has been verified through simulations.

著者

安喰 浩司 持永 芳文 兎束 哲夫 斎藤 勉 吉舗 幸信

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.3, pp.340-346, 2001-03-01 (Released:2008-12-19)

参考文献数

4

被引用文献数

3 6

---

At substations of Shinkansen, three-phase power received from the utility power system is converted into a pair of single phase power sources with different phases. When a Shinkansen car passes the boundary of two power sources with different phases, the power source for Shinkansen instantly switches from one to the other. Vacuum switches have been used as changeover switches so far. It takes about 300 msec for switching. By this system, Shinkansen cars can pass the boundary of two power sources under powering.Generally speaking, when a vacuum switch is closed at a voltage-phase of 90°, the inrush current into transformer will become small. On the other hand, although the power from substation is not supplied to Shinkansen at no-voltage of power source switching at the changeover section, counter electromotive force by auxiliary motor appears on the main transformer on the car. Due to the counter electromotive force, it is difficult to suppress the inrush current into the main transformer by the conventional vacuum switch. In contrast, the use of static switch such as semiconductor device can decrease the exciting inrush current into the transformer of Shinkansen car, when the turn-on timing of changeover switch is controlled. We investigated the control method for suppressing the exciting inrush current into transformer when a static switch is used as a changeover switch instead of vacuum switch. To verify the control method, we built and tested a mini model to simulate a changeover switch.

著者

桐淵 岳 財津 俊行 土井 昌志 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.140, no.3, pp.184-193, 2020-03-01 (Released:2020-03-01)

参考文献数

27

被引用文献数

5

---

Servo drive motor systems using PWM inverters have become very popular in the industrial market owing to their excellent control over torque, speed and position. Recently, problems of EMI noise and complexity of wiring from 3-phase PWM inverter power line cables have become critical issues in factories. In addition, using the regenerative energy of a motor has become important. A DC bus system can be a solution to these problems and demands. However, the DC bus system for servo drives has a risk of system instability because of interference between the DC bus and the servo drives. In this paper, an impedance-based stability analysis method is proposed that can predict the stability by only using the I/O (impedance) characteristics instead of all the system properties. The experimental results show that this method is useful.

著者

石倉 祐樹 細谷 達也 山本 真義

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.3, pp.168-174, 2020-03-01 (Released:2020-03-01)

参考文献数

15

---

This paper presents a bidirectional converter with multi-stage FETs featuring voltage balance control function using variable capacitors. The proposed converter is constructed using low-voltage Si-FETs in a series connection, and it improves the voltage balance between the drain-source voltages of the series connected FETs in the OFF period. Using the converter figure of merit (FOM), which can estimate the converter losses from the specifications of the FETs, the effectiveness of the proposed converter is compared to that of a converter using SiC-FETs. The factors of the voltage unbalance are analytically clarified using the equivalent circuit. The principle of voltage balance control function using the variable capacitor is discussed. The experimental results show that the proposed converter can achieve a maximum power conversion efficiency of 99.2%.

著者

武智 滉司 横井 健志 柿ヶ野 浩明

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.140, no.3, pp.140-147, 2020-03-01 (Released:2020-03-01)

参考文献数

14

被引用文献数

2

---

The output power of solar panels may decrease by degradation due to long-term usage and surface contamination. Methods to detect these problems are necessary for photovoltaic generation to be more widespread. AC impedance methods are used for electrochemical devices to inspect the inside situation of solar panels. In this study, we applied an ac impedance method to solar panels, which have some merits compared with the traditional methods. We added a small ac signal to the duty of a dc-dc converter to implement the ac impedance method. The small ac signal was a white noise generated by a pseudorandom binary sequence (PRBS) such that many frequency points can be measured simultaneously. Unlike traditional methods, this method can examine the solar panels when they are generating power. We measured shaded and nonshaded solar panel impedances and compared with the experimental results. From the results, we can show the potential to distinguish the shaded panel or the unshaded panel based on the difference of the impedance characteristics.

著者

玉井 伸三 山本 肇

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.3, pp.296-301, 2001-03-01 (Released:2008-12-19)

参考文献数

30

被引用文献数

2

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.1, pp.NL1_9, 2020

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.1, pp.NL1_8, 2020

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.1, pp.NL1_2-NL1_3, 2020

著者

岩田 洋夫

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.111, no.5, pp.340-342, 1991-05-20 (Released:2008-12-19)

参考文献数

3

著者

内舘 光 猪田 良介 辻 俊明 阿部 茂

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.6, pp.578-584, 2009-06-01 (Released:2009-06-01)

参考文献数

18

被引用文献数

2 5

---

This paper proposes a real-time image processing system for wheelchair recognition at elevator lobby. This system extracts objects with frame difference method. From the image of extracted objects, heads of people are detected by the Hough transform. Vertical shooting from ceiling improves the performance of people counting since the detected head has high roundness and occlusion of people is prevented. Two feature quantities are introduced to recognize wheelchairs. They are the area value and the ratio of traveling length to vertical length. Since these quantities require a method for drawing the contour line. This paper proposes a new simple method to draw a contour line. The effectiveness of this system is confirmed through experiments.