IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 113 , Issue 6
Showing 1-18 articles out of 18 articles from the selected issue
  • Akira Matsumoto
    1993 Volume 113 Issue 6 Pages 709-713
    Published: June 20, 1993
    Released: December 19, 2008
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  • Takeshi Mizuma
    1993 Volume 113 Issue 6 Pages 714-717
    Published: June 20, 1993
    Released: December 19, 2008
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  • Takeshi Mizuma
    1993 Volume 113 Issue 6 Pages 718-721
    Published: June 20, 1993
    Released: December 19, 2008
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  • Akira Matsumoto
    1993 Volume 113 Issue 6 Pages 722-724
    Published: June 20, 1993
    Released: December 19, 2008
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  • Takekazu Amano
    1993 Volume 113 Issue 6 Pages 725-727
    Published: June 20, 1993
    Released: December 19, 2008
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  • Hiroshi Sakata, Hiroaki Miyamoto, Kenji Sugimoto, Kazuhiko Kikuchi, Sh ...
    1993 Volume 113 Issue 6 Pages 728-734
    Published: June 20, 1993
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Recent development in power electronics has made power semiconductor device larger and complicated, and device simulation is necessary to predict their characteristics. From the fundamental equations of semiconductor device, potential distribution and carrier concentrations can be solved using the finite element method. In this study, we make formulation for one dimensional analysis of a gate turn off thyristor (GTO) and simulate switching characteristics in order to know the effects of snubber circuit. In conclusion snubber condensor is necessary to suppress spike voltage, but increases the turn off loss of GTO.
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  • Tanzo Nitta, Yasuyuki Shirai, Toshikazu Shibata, Takao Okada, Kaoru Hi ...
    1993 Volume 113 Issue 6 Pages 735-743
    Published: June 20, 1993
    Released: December 19, 2008
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    Energy transfer circuits with a superconducting magnet for an energy storage are proposed, discussed and tested for power supplies as quick changes of current through a superconducting magnet. In this paper, we derive analytical steady state solutions on energy transfer circuits of inductor converter bridges and discuss the controllability, the voltage across condensers, the maximum and the average voltage across the superconducting magnet, and ripples of the voltage. The results are useful for the design of energy transfer circuits.
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  • Hisashi Takahashi, Takashi Kenjo
    1993 Volume 113 Issue 6 Pages 744-752
    Published: June 20, 1993
    Released: December 19, 2008
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    A study has been made to estimate the resistive and viscous friction components of a system operating with a DC servomotor in a PWM mode. This is carried out by digital computation based on an equivalent circuit representing a motor and its load; no analog means are used. This technique will be useful for optimum control of a servomotor, because it can be implemented only with a feed-forward technique requiring the details of system parameters for determining current command. Motor winding resistance, device resistance and grease viscosity are essential factors which are very sensitive to temperature. Here, mechanical viscous friction is represented by an equivalent resistance, and the armature resistance and MOSFETs' on-resistance are treated as yet another parameter. They are determined from the time differences between real zero-crossings for current/speed and the ones computed from four reference quantities. The theory and test data obtained in a system using an i80960 MPU are presented.
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  • Kuniho Tanaka, Etsuo Sakoguchi, Eiji Yamada
    1993 Volume 113 Issue 6 Pages 753-759
    Published: June 20, 1993
    Released: December 19, 2008
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    Numerous studies were performed so as to evaluate the performance of the photovoltaic power systems (PV systems), included maximum power control of the solar cell, effects of the PV systems on distribution feeders, long-term performance of the PV systems, etc. In order to estimate the performance of the PV systems, the output characteristics of the solar sell should be taken into consideration.
    In this paper, a new method of the simulated power source (SPS) to analyze the PV system is proposed. The SPS is under the control of the 10cm2 reference solar cell, so the output characteristics of the SPS is in proportion to the output characteristics of the reference solar cell not only static but dynamic.
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  • Tokuo Ohnishi, Yoshikazu Minamoto
    1993 Volume 113 Issue 6 Pages 760-767
    Published: June 20, 1993
    Released: December 19, 2008
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    In this paper, we investigate the control system of the active filter to reduce the kVA rating of the PWM converter to the load capacity by using L-C Components. In the system, we apply the proposed new control scheme by selecting the appropriate voltage vector based on the instantaneous ripple line power which is useful for simplifing the control system and high efficient and high accurate operation.
    In this paper, we show the system configuration, the control system and the design index about the L-C values, and then we examine the performances by some simulation analysis and we verify the feasibility of the control system from the experiments.
    This combined system of the active filter are useful for the kVA rating reduction of the PWM converter in addition to the inherent excellent properties of the proposed control method.
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  • Kazunori Matsumoto, Tatsuya Suzuki, S. Sangwongwanich, Shigeru Okuma
    1993 Volume 113 Issue 6 Pages 768-777
    Published: June 20, 1993
    Released: December 19, 2008
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    In this paper, the authors show a link between a heuristic controller used in industry and a theoretical generalized controller. First of all, we clarify the internal structure of the generalized two-degree-of-freedom controller which yields a link between the theoretical researches and the practical applications. This is particulary useful in the applications where the guidelines on the design of the controller can be obtained from the physical insight of the systems. Secondly, we indicate how to blend identification and control together without any modification of the controller. This is in fact the problem of closed-loop identification. This can be considered also as the identification part of the auto-tuning technique. Thirdly, we propose a new design technique of a free parameter taking into account a robust stability based on the information obtained from the identification. Finally, we apply the proposed algorithm to vibration suppression control, and show some simulation results to verify the effectiveness of the proposed algorithm.
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  • Nobukazu Wakabayashi, Tadahiro Kitahashi
    1993 Volume 113 Issue 6 Pages 778-785
    Published: June 20, 1993
    Released: December 19, 2008
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    An automatic program generation system for NC punch press machine is proposed. NC programs to control machine tools can be generated automatically by the system according to the data described in the design drawing of final products.
    In this system, silhouette decomposition procedure which is one of pattern recognition techniques is employed to recognize the drawing. The procedure is applied to decompose a complex shaped hole in the design drawing into punch primitives, where the shaped hole and the punch primitives correspond to the overlapped silhouette and the discrete components of it, respectively.
    The outline of the developed silhouette decomposition procedure and automatic program generation system is given.
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  • Takesi Sugimoto
    1993 Volume 113 Issue 6 Pages 786-793
    Published: June 20, 1993
    Released: December 19, 2008
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    The most common method we have employed so far to reduce noise is to insulate the noise source or absorb the noise. However, the noise in the low frequency range tends to spread through diffraction, so that such a method has been insufficient in its effect. Meanwhile, the active noise control lately being developed is still immature in its technology and accordingly its application is yet limited, but provided it is adequately utilized, it is likely to be highly effective against the low frequency noise. It would be the best way of fighting the noise to suppress it by full use of passive control method and resort to active control method to deal with what the passive method cannot eliminate.
    In this study an application of real time adaptive processing is made on the case of three secondary sources and then theoretical analysis is made. On the other hand there is conceivably a case in reality when the diffraction spread area turns out wides, so the case is theretically analyzed.
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  • Tomonobu Senjyu, Katsumi Uezato
    1993 Volume 113 Issue 6 Pages 794-800
    Published: June 20, 1993
    Released: December 19, 2008
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    The nonlinear states feedback control of field voltage to improve the transient stability of the synchronous motors is proposed in this paper. This control method also makes it possible to suppress rotor swings as the motor is subjected to disturbances. Since the system is represented with a nonlinear system, the stability study of this control system is judged by Lyapunov's direct method. Feedback gains of the controller are determined by using the Lyapunov function. The validity and usefulness of the control method are investigated by numerical calculations and experiments.
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  • Takahiro Ara, Hiroshi Asano, Shoichi Oda, Kouki Matsuse
    1993 Volume 113 Issue 6 Pages 801-807
    Published: June 20, 1993
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    It is almost impossible to measure the starting performance of middle and large synchronous motors in a factory, because it needs a large capacity of equipments to test their performance. Authors propose a new method that identifies the equivalent circuit constants of synchronous machines to predict their performance.
    The procedure is as follows; first, the DC decaying current in armature winding is measured and the frequency response by Fourier Transformation using the test data is calculated. Next, the square errors are minimized using the calculated operational impedance, and as a result the unknown constants in equivalent circuit are identified.
    Moreover, we show the procedure to get true armature leakage reactance by inserting the external resistance between the field winding terminals.
    The starting performance of a synchronous motor with damper winding (10kW-200 V-31.9 A-4P) is predicted by this method and agrees with actual data. The test capacity is about 0.1% to the installed capacity which is needed when the motor starts with 50% rated voltage.
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  • Ryo Takagi, Satoru Sone
    1993 Volume 113 Issue 6 Pages 808-816
    Published: June 20, 1993
    Released: December 19, 2008
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    The load of a dc railway has very large peaks, while the average power is low. This makes the capacity of wayside power equipments larger. Recently the ratio of peak power to average power is even higher because of the introduction of a large number of electric multiple units with regenerative brake system. Such introduction has also made the contact system's unreceptiveness of the regenerated energy a significant problem. To solve these problems, researchers are trying to add intelligence to the power system.
    In this paper, the authors describe a novel method of intelligently controlling traction power of trains. In this system the trains reduce their accelerating power to cut current peaks in wayside substations. With the proposed method we can reduce load peaks by up to 31%, which means that the characteristics of railway load has been changed drastically. The delays of the trains involved are negligible. Also the unreceptiveness of the regenerated power can be almost eliminated.
    In the first part of this paper, we describe the idea of traction power control. Then we describe how the idea is applied to wayside substation load peak suppression or receptiveness improvement, with some simulation results to prove the method. Finally, we discuss the possibility of further improvement of the system by adding communication capability between trains and wayside equipments.
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  • Katsumi Uezato, Tomonobu Senjyu, Yoshikatsu Tomori
    1993 Volume 113 Issue 6 Pages 817-818
    Published: June 20, 1993
    Released: December 19, 2008
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  • 1993 Volume 113 Issue 6 Pages 830
    Published: 1993
    Released: December 19, 2008
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