IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 115 , Issue 7
Showing 1-21 articles out of 21 articles from the selected issue
  • Shigekazu Sakabe
    1995 Volume 115 Issue 7 Pages 829-832
    Published: June 20, 1995
    Released: December 19, 2008
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  • Ryoichi Kurosawa
    1995 Volume 115 Issue 7 Pages 833-834
    Published: June 20, 1995
    Released: December 19, 2008
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  • Chikara Kaidou, Toshiyuki Ishibashi, Yutaka Higashimura
    1995 Volume 115 Issue 7 Pages 835-837
    Published: June 20, 1995
    Released: December 19, 2008
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  • Akira Ishizaki, Yuugi Akiyama
    1995 Volume 115 Issue 7 Pages 838-842
    Published: June 20, 1995
    Released: December 19, 2008
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  • Shinichiro Kon, Yuzo Itoh, Takeshi Tschiya, Akio Nii
    1995 Volume 115 Issue 7 Pages 843-851
    Published: June 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    It is well known that the speed control system, even though which is constructed with an excellent control method, has an unexpected steady speed error when it is suffered by a periodical load disturbance. As the method of eliminating the speed fluctuation caused by such kind of disturbance, a repetitive control is the most effective. But the repetitive control method is only adoptive for a constant speed control system.
    In this paper, a novel control system designing method which is effective to both the constant speed control system and variable speed driving system is shown. The fact that a periodical disturbance depends on time function and also rotational angle is utilized to design the control system. From the result, the numerical modeling of the controlled object is derived in the rotational angle function domain. For the obtained numerical model, an extended state variable equation based on the original system is presented by using the control technique named “Error System Technique”. And then the optimal feedback gains are decided by solving the optimal regulator problem for the extended state equation. Therefore, a stability of the system is ensured.
    The proposed control method is applied to DC motor variable speed control system and the experimental setup is constructed. Finally, the effectiveness of the proposed method is confirmed by the result of simulations and experiments.
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  • Takahiro Ara, Tsunaki Akima, Shoichi Oda
    1995 Volume 115 Issue 7 Pages 852-858
    Published: June 20, 1995
    Released: December 19, 2008
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    This paper is concerned with a new method that identifies the equivalent circuit constant of synchronous machines using D. C. decaying current. The procedure is as follows;
    (1) D. C. voltage is applied to the armature winding (two terminals with the third one open) of a stationary synchronous machine through a resistance. When two terminals are closed, the winding is short-circuited and the current in the armature winding decays. The whole process of current decay is recorded.
    (2) The current decay is approximated by the exponential function, and values of the index number and coefficient are identified with the least square method.
    (3) The equivalent circuit constant is identified from the relationship which is formed between these constants and the exponential function.
    The starting performance of synchronous motor with damper winding is calculated using the method and agrees with actual data.
    The test capacity is needed about 0.1% of a starting capacity with 50% voltage.
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  • Masahiro Kayama, Yoichi Sugita, Yasuo Morooka
    1995 Volume 115 Issue 7 Pages 859-866
    Published: June 20, 1995
    Released: December 19, 2008
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    In this paper, we propose a distributed diagnosis system combining Immune Network (IN) and Learning Vector Quantization (LVQ) for detecting fault sensors accurately in industrial plants. It has two execution modes, namely, its training mode, where LVQ extracts correlation between each two sensors from their outputs when they work properly, and its diagnosis mode, where LVQ contributes to testing each two sensors using the extracted correlation, while IN contributes to determining fault sensors by integrating these local testing results obtained from LVQ. How to define a threshold of each quantization vector for judging whether testing data satisfy the correlation or not, is also discussed to improve diagnosis capability of the developed system. It is shown that the thresholds can be determined effectively by the constraint that the hyperregion corresponding to the normal sensor outputs in each quantization vector space is a single region.
    Diagnosis capability of the developed system is evaluated using a proto-type system for detecting fault sensors of a reheating furnace plant. By the proposed method, abnormal sensors, such as aged deteriorated ones, which have been difficult to be detected only by checking each output of sensor independently, are possible to be specified.
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  • Tadashi Fukami, Michinori Imamura, Toshio Miyamoto
    1995 Volume 115 Issue 7 Pages 867-873
    Published: June 20, 1995
    Released: December 19, 2008
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    A new single-phase capacitor self-excited induction generator with self-regulating features is presented. It is suitable for use as a portable power source with a power rating of several kilowatts driven by a constant-speed prime mover such as oil engine. The new generator employs a squirrel cage three-phase induction machine, and a single-phase load is connected externally across the three-phase terminals of the stator winding through series and parallel capacitors. The series and parallel capacitors provide self-regulating and self-exciting features. The voltage regulation of the generator accompanying the load variation is very small due to the effects of the capacitors in both resistive and inductive load conditions. Additionally, since a Y-connected stator winding is used, the waveform of the output voltage becomes a sinusoidal wave.
    In this paper the system configuration and the operating principle of the new generator are explained, and the basic characteristics are also investigated by means of a simple analysis and detailed experimental results with a laboratory machine.
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  • Hirotaka Yamamoto, Atsushi Iga, Kaoru Ishihara, Yuuichi Mita, Hirohisa ...
    1995 Volume 115 Issue 7 Pages 874-883
    Published: June 20, 1995
    Released: December 19, 2008
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    In the design, operation and evaluation of a photovoltaic power generation systems (PV systems), it is particularly important to accurately estimate the total amount of annual electric power generated by PV system. The authors have developed an original “simulation program for the calculation of the amount of power generated by PV system”, and confirmed its estimation accuracy by verification tests. The authors performed various simulation calculations using the developed program in order to apply the results to the development, design, and operation of PV systems. The authors also studied the application of the developed simulation program.
    Effect of various factors on annual electric power generated was evaluated by simulation calculation. As a result, notable findings have been obtained with respect to the relationship between the method of controlling dc voltage of photovoltaic array, fill factor (FF), wind velocity, resistance of dc collection conductor, and annual electric power generated.
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  • Mitsuhide Maeda, Takuji Keno, Yuji Suzuki, Toshiro Abe
    1995 Volume 115 Issue 7 Pages 884-890
    Published: June 20, 1995
    Released: December 19, 2008
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    An SI thyristor using a normally-off planar-gate structure in a low power class has been developed for the use as a power switching device in a three-phase inverter circuit. A 600V-15A class SI thyristor with very fast switching time (tgt, tgq) and low forward voltage drop (VTM) was designed and fabricated. This design was performed with a reasonable wafer structure (n-/n/p+), an n- base carrier concentration and thickness, and a gate structure (gate diffusion length and gate pitch). Microscopic processing was used to obtain this SI thyristor. The performance trade-off between turn-off time and forward voltage drop is controlled by a life time control process using proton irradiation which results in a very fast switching time with tgt of 500ns and tgq of 500ns with VTM of 1.5V (at IT=18A). At the current level of IT=18A, the current density in the active area becomes 200A/cm2 which indicates that the performance of the SI thyristor is superior to that of conventional IGBTs and MOSFETs.
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  • Katsumi Ohniwa, Tadao Fujimaki, Ryuichi Jimbo
    1995 Volume 115 Issue 7 Pages 891-896
    Published: June 20, 1995
    Released: December 19, 2008
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    It is a big advantage of a photovoltaic power system to be able to generate power even in a small sized installation. A residential photovoltaic power generator makes the most of this advantage. In this case the controller for the maximum power tracking is required to be compact because space for the control installation can not be easily obtained. For this reason the development of a high frequency controller is essential. However the dynamic characteristics of a solar cell module are different from a static one owing to the presence of hysteresis at a high frequency. In such a high frequency region the conventional tracking method based on no hysteresis can not be responsible for control of the power system.
    In this paper the authors propose a new self-tuning maximum power tracking method for adjusting the control parameters of the power system at the high operating frequency. This method is distinguished by the fact that the control parameters are adjusted by the estimated value on the dynamic equivalent circuit of the solar cell module. The computer simulation and experimental results of the power system controlled by the proposed method shows excellent performances.
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  • Yukihiko Sato, Teruo Kataoka
    1995 Volume 115 Issue 7 Pages 897-905
    Published: June 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, a control method to improve ac input current waveforms of current type PWM rectifiers which has been proposed by the present authors is investigated. In this control strategy, state feedback of the ac side LC filter is introduced to eliminate waveform distortion and transient oscillation of input current of the rectifier. Theoretical investigation is made on the basis of equivalent circuits of the ac side of the rectifier which are derived in this paper. The function of the proposed feedback control is analyzed from the view point of the power flow between the LC filter and the bridge circuit of the rectifier.
    From the results of the analysis, it is shown that the proposed control strategy provides damping effect in the form of equivalent resistance connected in parallel with the filter capacitor. The waveform distortion and transient oscillation of the input current are suppressed by this damping effect. On the basis of these results, a brief comparison between the improvement mechanism of the input current waveform by the proposed feedback control and that by active power filters is made. The effects of the feedback gain, control delay, and the circuit parameters of the LC filter on the elimination of harmonic current and on the stability of operation are investigated in detail. Analytical results shown in this paper are confirmed by computer simulation and experimental investigation.
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  • Fukashi Ueda, Masahiro Asao, Keiju Matsui, Kazuo Tsuboi, Tadashi Kobay ...
    1995 Volume 115 Issue 7 Pages 906-915
    Published: June 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The neutral point clamped (NPC) PWM inverters has many advantages such as its ability to operate the motor with nearly sinusoidal current waveforms. For this reason, in larger capacity inverter systems, NPC PWM inverters using the GTOs and the like have been also put into practical use, because of great advantages to large capacity ac motor drives, such as lower ripple currents and higher output voltages. With the spread of applications, still larger capacity inverters are also expected. However, since the capacities of such switching devices are insufficient, a certain technique and controlling method are proposed for the parallel connections of NPC inverters. The output voltage waveforms of the proposed inverter have certain voltage levels, thus it is anticipated that it will be difficult to analyze the output harmonics. For such waveforms of output voltage and current sharing reactor, frequency analysis approach is described, whose results are verified by experiments.
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  • Yi-feng Chen, Kiyoshi Fujikawa, Hirokazu Kobayashi, Kouhei Ohnishi, A. ...
    1995 Volume 115 Issue 7 Pages 916-923
    Published: June 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, we propose a control algorithm for current-type converter with LC filter placed on the ac side. To improve the sinusoidal waveform of ac input current, we introduce an approach based on sliding mode. It is shown that the PWM pattern is gotten as a natural result of the control process, robust property to parameter variation can be introduced into the control algorithm easily. Because all of the control processes is completed in software and the switching signals are accessed directly within the control strategy, hardware of control circuits can be simplified. To confirm the validity of proposed control algorithm an experimental investigation is also made. The result of experiment verified the properties of tracking to reference, source power factor appointablity and suppressing effect on LC filter resonant oscillation.
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  • Hidemi KODATE, Ken KINOSHITA, Mituo OKU
    1995 Volume 115 Issue 7 Pages 924-929
    Published: June 20, 1995
    Released: December 19, 2008
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    This paper presents a method to form short cyclic design hyetograph by using data of a Radar raingauge for the simulation program we have developed. The program named stormwater pump operator supporting (SPOS) system has been so far designated to calculate in online operations. This time, we add an offline mode of the program for pump operators' training. Stormwater pumps are, if necessary, turned on or off by every calculation interval of some minutes, so design hyetograph as an input of the SPOS system has, instead of hourly cycle of observation, the same short cycle of the pump. For this purpose, data of Radar raingauge are suitably employed. We regard rainfalls as a Markovian process and make an algorithm in a frame of the dynamic programming by R. Bellman. Calculation results are shown.
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  • Kazuo Ohnishi
    1995 Volume 115 Issue 7 Pages 930-935
    Published: June 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A new calculation method has been developed in order to evaluate torque ability of permanent magnet motors, such as dc brush and brushless motor, stepping motor and synchronous motor. In this method, motor constant kM which is proportional to rated torque is calculated from number of pole pair p, phase linkage flux Φ, total area of winding slots ST and coil one turn length l1 Results of evaluation show that magnetic structures with non-lapconcentric windings and the ones with inductor-teeth on PM or HB-type stepping motors are excellent. And finally a design method has been also developed for a optimum structure in permanent magnet motor with non-lapwindings.
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  • Takuma Sutani, Kazuo Bessho
    1995 Volume 115 Issue 7 Pages 936-941
    Published: June 20, 1995
    Released: December 19, 2008
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    In order to elucidate nonperiodic oscillations of a six-dimensional magnetic frequency tripler with series-connected reactors, we execute computer simulations by using the fourth-order Runge-Kutta method, and depict bifurcation diagrams with stroboscopic solutions every 2π rad. In a bifurcation diagram we have found a period-doubling bifurcation, and also detected a chaotic attractor of a Poincare map in a region after the period-doubling bifurcation. This paper describes a circuit for the simulations, an equation of states, a bifurcation diagram, a period-doubling bifurcation in the bifurcation diagram, a chaotic attractor, and time series for the chaotic attractor.
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  • Moriaki Takechi
    1995 Volume 115 Issue 7 Pages 942-949
    Published: June 20, 1995
    Released: December 19, 2008
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    This paper describes a design approach for iron shielded high homogeneity magnet especially for use in magnetic resonance imaging system. Fundamental solutions for axisymmetric magnetic field including iron shield are obtained in a form of Legendre series expansion based on equivalent surface current method. Influences of iron shield on the fundamental solutions are studied to investigate an optimal design approach for iron shielded magnet. A new method is presented to obtain optimal coil configuration considering constraints for interior and exterior magnetic fields simultaneously. Some examples of coil configurations are obtained by the proposed method.
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  • Kiwamu Hino, Kenji Watanabe, Hiromu Ariyoshi
    1995 Volume 115 Issue 7 Pages 950-951
    Published: June 20, 1995
    Released: December 19, 2008
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  • Hisao Kubota, Daisuki Yoshihara, Kouki Matsuse
    1995 Volume 115 Issue 7 Pages 952-953
    Published: June 20, 1995
    Released: December 19, 2008
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  • 1995 Volume 115 Issue 7 Pages 956
    Published: 1995
    Released: December 19, 2008
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