IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 121 , Issue 9
Showing 1-15 articles out of 15 articles from the selected issue
  • Hideki Hashimoto
    2001 Volume 121 Issue 9 Pages 917-922
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Shin-ichi Toda, Takuma Henmi, Yoosuke Nakazawa, Ikuo Yasuoka
    2001 Volume 121 Issue 9 Pages 923-932
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    It is important to get high re-adhesion control performance for Electric Railcars. Especially in commuter's train the ratio of motor car to trailer car are small. Therefore big traction force are needed. For this point of view, wheel slip occurrence probability should be reduced in condition of decreasing adhesion force. We have developed Anti-slip and readhesion control based on a relation of adhesion force and slip speed.
    This paper describes basic ideas of these control method and actual railcar running test.
    As a result, acceleration characteristic was improved by about fifty percent and wheel slip occurrence probability was reduced to about thirty percent.
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  • Takeshi MIZUNO, Yuichiro TAKEMORI
    2001 Volume 121 Issue 9 Pages 933-940
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A transfer function approach is applied to the analysis and design of zero power controllers for magnetic suspension systems. The general structures of controllers achieving zero power control are derived for both current- and voltage-controlled magnetic suspension systems. For the former-type system, there are two basic approaches: feeding back velocity signal and introducing a minor feedback of the integral of current. Both the approaches are applicable to the latter-type system. In addition to them, the position-sensorless approach also realizes zero power control automatically. A direct synthesis method for zero power control is developed based on the analysis. Several experiments are carved out with a single-degree-of-freedom model. The experimental results show the effectiveness of the proposed synthesis method.
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  • Takaharu Takeshita, Hiroyuki Goto, Takahiro Masuda, Nobuyuki Matsui
    2001 Volume 121 Issue 9 Pages 941-947
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper presents the input current waveform control of the rectifier circuit which realizes simultaneously the high input power factor and the harmonics suppression of the receiving end voltage and the source current under the distorted receiving end voltage. The proposed input current waveform includes the harmonic components which are in phase with the receiving end voltage harmonics. The control parameter in the proposed waveform is designed by examining the characteristics of both the harmonic suppression effect in the distribution system and the input power factor of the rectifier circuit. The effectiveness of the proposed current waveform has been confirmed by experiments.
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  • Toru Yamaguchi, Makoto Takahide, Yoshimoto Nakamura, Naoki Kohata
    2001 Volume 121 Issue 9 Pages 948-955
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Recently, the research and development of the highly intelligent agent systems, such as ITS (Intelligent Transport Systems), have been performed with the progress of the information infrastructure. In such an intelligent agent system, a man-machine system is very important.
    In this paper, we pay attention to the display function that becomes an interface between the human and the machine. This display function needs to present the suitable display for the user.
    Therefore, we propose a method which is able to acquire the display knowledge with a few learning times by the interaction with the user. We realize this method based on Q-Learning, and we also use the “Chaotic Evolution method” to improve Q-Learning that requires many learning times.
    In this paper, the proposed “Q-Learning with Chaotic Evolution” is applied to the driver's support display agent in the commuter car system, which is one of man-machine systems of ITS. The effectiveness is verified by simulation and experiment.
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  • Toru Yamaguchi, Kenichiro Hirayama, Hideki Hashimoto
    2001 Volume 121 Issue 9 Pages 956-963
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In ITS, driving support systems for a driver is very important. This paper aims at providing human with his blind spot information in advance, namely, augmenting human's sense of sight (“augmented sensing”) in commuter system considered as one realization form of ITS. We propose an “distributed-sensory-intelligence architecture”, which distributes sensory intelligence (with pair of sensor and intelligence) and connects each other by network. In this paper, we experimented on “re-composition of information” based on this archi-tecture and realized the “augmented sensing”.
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  • Hirofumi Kiyotake, Hidehiko Okada, Kouichi Ishizaka, Ryozo Itoh
    2001 Volume 121 Issue 9 Pages 964-970
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A single-phase voltage-doubler rectifier, which has two auxiliary bidirectional switches, is studied. The proposed rectifier has the advantages that the imbalance of the voltages across the capacitors, connected in series, is minimized independent of the working conditions and the discharge of capacitors is adjusted by arranging two auxiliary bidirectional switches. Therefore, the total capacitance of the rectifier can be reduced. The tested setup, using four insulated-gate bipolar transistors (IGBTs) and a microcomputer as a PI control-ler, is implemented and IGBTs are switched with 20kHz, which is out of audible band. Moreover, a rigorous state-space analysis is introduced to predict the operation of the rectifier. From the results, the well-balanced capacitor voltages can be achieved and the input current can be sinusoidally waveshaped with a near-unity power factor under the steady state and transient conditions even if the rectifier is operated with small series-connected capacitors. Consequently, the single-phase voltage-doubler rectifier studied is suitable for AC-DC conversion equipment with output voltage higher than twice that of the supply and with reduced total capacitance.
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  • Akihiro Hoshino, Shinichi Isobe, Masayuki Morimoto, Masayuki Sanada, Y ...
    2001 Volume 121 Issue 9 Pages 971-977
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Lately, the application of axial flux type permanent magnet machine with coreless windings for high speed electric machines and electric vehicles have been discussed, from the standpoint of efficiency and size.
    In this paper, loss analysis and efficiency improvement of the axial flux type with coreless windings generator are given. The loss is examined based on the experimental data. In order to separate each loss, the prototype was fabricated of which component materials are interchangeable. The eddy current loss generated in the frame structure and the inside of the copper wire are examined. To decrease the eddy current loss, the thin Litz wire and the non -magnetic frame structure are recommended. Finally, the prototype having the output of 750W and the rated speed of 3, 600rpm, has been constructed, which has shown high efficiency of 96% (including machine loss) and 98.9% (excluding machine loss).
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  • Sompob Polmai, Toshifumi Ise, Sadatoshi Kumagai
    2001 Volume 121 Issue 9 Pages 978-987
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper presents a method to compensate voltage sags with minimum energy injection for a series connected voltage restorer using a micro-SMES. A circuit for extracting the fundamental symmetrical components from sag voltages and a minimum energy injection algorithm is described. Simulations of voltage sag compensation have been carried out using PSCAD/EMTDC for various types of fault. The simulation results confirm the validity of the proposed method and show the possibility to reduce the size of energy storage device.
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  • Makoto Saito, Tosihisa Shimizu
    2001 Volume 121 Issue 9 Pages 988-995
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Large power utility interactive inverters used for large energy storage system are composed of the multiple connected inverters, in order to realize the high efficiency and the high performance on the harmonic elimination characteristic simultaneously. Some disadvantages on the multiple connected inverters, such as harmonic current flowing from an inverter unit to the other one, and increase of the number of inverter units, cannot be overcome easily.
    In this paper, a novel strategy of the high power utility interactive inverter, which is composed of a large power with low switching frequency PWM inverter (High Power PWM Inverter), a LC passive filter and a series active filter (Series AF), is presented. Because harmonic components contained in the utility line current is absorbed by the series AF, the switching frequency of the PWM inverter can be selected to about 1kHz. And, because the power capacity and the output voltage of the series AF can be suppressed lower than 10% of the power capacity and the output voltage of PWM inverter, low voltage and high-speed power devises can be applied to the series AF. Consequently high power, high efficiency and high harmonics elimination performance can be realized without increasing the number of inverter units.
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  • Hidehiro Ikeda, Tsuyoshi Hanamoto, Teruo Tsuji, Yoshiaki Tanaka
    2001 Volume 121 Issue 9 Pages 996-997
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, we propose a vibration suppression method for a 2-inertia speed control system by a fuzzy controller. We also apply a genetic algorithm (GA) for the determination of the scaling factors. The effectiveness of the method has been verified by experiments.
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  • Tamio Hanazawa, Torao Egashira
    2001 Volume 121 Issue 9 Pages 998-999
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    We have been trying to probe the commutation spark mechanism of high-revolving universal motors with two visions of a high-speed camera and brush sparking voltage. The generation of commutation sparks coincides with large pulses in brush sparking voltage, and the sparks occur when the large pulses begin to decrease at the peak. The shape of a single peak value in large pulses becomes a triangle, and plural peak values form square-wave. This paper shows that it is possible to judge generation of commutation sparks easily by observing shapes of peak values of large pulses in armature terminal voltage with a synchroscope.
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  • Kenmei Kukihara
    2001 Volume 121 Issue 9 Pages 1000-1001
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A simple electronic starter is proposed for single-phase induction motors. Peak voltage _??_0.7V of a tiny series-resistor R, of main coil, triggers TRIAC on, in its reverse-trigger mode. At the peak 90° of sinusoidal voltage of R, current of auxiliary coil is already at 180° due to starting capacitor. So, the TRIAC is triggered in a narrow interval including the point 180° of auxiliary current, that is zero-cross switching. Thus, the auxiliary current is perfectly sinusoidal in each cycle, and so the starting characteristics are just the same as those of metal contacts. As rotation increases, main current decreases and stops triggering.
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  • Katsumi Koishi, Toru Hosaka, Hisao Kubota, Kouki Matsuse
    2001 Volume 121 Issue 9 Pages 1002-1003
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, we propose a method to compensate for nonlinear friction in linear dc motors (LDM) using a neural network controller that is added to the conventional controller. The output of the neural network controller is multiplied by sign function of the velocity reference, because it learns rapidly the nonlinear friction which is related to signs of the velocity. We applied the new method to positioning control of an LDM. The validity of the new method was verified by the experimental results.
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  • Toshihiko Noguchi, Takehide Omura, Daichi Hiraishi
    2001 Volume 121 Issue 9 Pages 1004-1005
    Published: September 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This study focuses on influence of the iron-core loss resistance on parameter identification of a field-oriented induction motor. The rotor resistance can be identified insensitively to the stator resistance using reactive power. However, the identification error still remaines due to model mismatch caused by the iron-core loss resistance. This paper discusses an analytical aspect of the identification error characteristic.
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