IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 115 , Issue 6
Showing 1-23 articles out of 23 articles from the selected issue
  • Hiroyuki Wakiwaka
    1995 Volume 115 Issue 6 Pages 669-673
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Toshiko Nakagawa
    1995 Volume 115 Issue 6 Pages 674-679
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Shigeyasu Kawaji, Ken'ichi Ogasawara, Hidenobu Honda
    1995 Volume 115 Issue 6 Pages 680-685
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The requirement to solve practical nonlinear dynamic control problems is very strong and imperative. This paper aims at studying the feasibility of the application of the Genetic Algorithm (GA) to the nonlinear dynamic control problems. As an application example, the swing up control problem of the pendulum is discussed. It is extremely difficult to determine the swing-up control rule analytically because the problem is highly nonlinear and has multiple solutions. First, the problem is changed into a discrete-time system with the input of bang-bang with zero type. Second, a suitable genetic coding is found and the fitness function is designed. The computer simulations and experimental results demonstrate various swing up motions, and it is confirmed that GA is a suitable method for the complicated nonlinear dynamic control problems.
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  • Susumu Kouno, Takashi Toyohara, Shogo Tanaka, Kaoru Kamachi
    1995 Volume 115 Issue 6 Pages 686-693
    Published: May 20, 1995
    Released: December 19, 2008
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    In many cranes, anti-sway control of crane-lifter is used for automatic operation. The authors previously proposed an automatic dynamic measurement system which measures the attitude of a crane lifter by using an accelerometer located on the lifter. The system enabled on-line measurement of the lifter attitude by introducing a dynamic model of the motion of the crane-lifter and using Kalman filters. By using the measurement system, this paper shows an anti-sway control method which is based on a simple velocity pattern of a trolley of the crane. Experimental result is also shown in the paper.
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  • Takahiro Ara, Tunaki Akima, Shoichi Oda
    1995 Volume 115 Issue 6 Pages 694-701
    Published: May 20, 1995
    Released: December 19, 2008
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    It is impossible to determine subtransient (transient) reactance and subtransient (transient) short-circuit time constant of middle and large synchronous machines from the sudden three-phase short-circuit test, because it needs a large capacity of equipment to determination of quantities from the test.
    Thus, this paper describes a new method which is wield to measures these constants by a simple test using a small D. C. power supply.
    The key points of this method are summarized 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 decaying current is recorded.
    (2) The value of transient phenomena of the winding calculated from circuit equations (circuit of armature, field winding and damper winding) is compared with actual data, and the unknown equivalent circuit constants can be identified by the least square method.
    (3) Transient phenomena of the sudden three-phase short-circuit are calculated by two-reaction theory using identified constant. As a result these transient constants are calculated.
    Transient constant of the synchronous machine by the new method almost agrees with the observed values.
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  • Hirotaka Yamamoto, Atsushi Iga, Kaoru Ishihara, Yuuichi Mita, Hirohisa ...
    1995 Volume 115 Issue 6 Pages 702-711
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    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 applied a new I-V curve construction method developed for the calculation of output power from a photovoltaic array in order to develop a practical “simulation program for the calculation of the amount of electric power generated by PV system.” The following items were clarified by this research.
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  • Hiroshi Ohsawa, Gunji Kimura
    1995 Volume 115 Issue 6 Pages 712-718
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The development of zero-voltage switching (ZVS) technique has attracted for many industrial applications. In this paper, a quasi resonant ZVS buck converter linked with a buck-boost component is presented. The proposed system has the following features. (1) The large peak current does not flow into the semiconductor switches and the reactors. (2) When a storage battery is used as the power supply, a solar battery can be connected with buck-boost component in order to charge the storage battery. Therefore, this system is very suitable for high power and high efficiency DC to DC converter system.
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  • Tadahito Aoki, Yutaka Kuwata, Seiichi Muroyama, Tohru Koyashiki
    1995 Volume 115 Issue 6 Pages 719-725
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In recent years, switching mode rectifiers (SMRs) which are composed of a capacitor input type rectifier and a DC-DC converter have been used to supply DC power to various electronic systems. Despite their desirable features such as small-size, light-weight, and high-efficiency, there is a disadvantage in that their input current waveforms include many harmonic components, which could severely influence other systems that AC power lines in common with the SMR. Conventional method to improve the waveforms uses bidirectional switch modules or three full bridge conversion circuits. However, this method cannot decrease the size, because the number of the switching devices increase.
    To solve this problem, a novel SMR with a high frequency transformer has been studied. In it, input 3-phase AC voltage is directly converted into high frequency AC, then rectified. Futhermore, low order harmonics in the input current waveforms can be eliminated by controlling the conduction intervals of switches, proportional to the instantaneous input line to line voltage.
    This paper describes the configuration of the novel SMR and its operating principle for obtaining sinusoidal input current waveforms as well as discusses the distortion factor characteristics of the input current waveforms.
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  • Hirotami Nakano, Satoshi Togasawa, Akira Nabae, Tsuyoshi Murase
    1995 Volume 115 Issue 6 Pages 726-734
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Instantaneous compensation theory of reactive power is conventionally based on coordinate transformation method. That is, three phase voltages and currents on three dimensional coordinate are transformed into αβcoordinate or rotating coordinate quantities. Therefore, it is unavoidable for the control system to be complicated and also it is difficult to understand physical meanings of voltages and currents on the original three dimensional coordinate.
    The authors have been proposed the instantaneous reactive power compensation theory using a three dimensional cross vector. The proposed theory does not use any coordinate transformations, such as a rotating coordinate transformation or a three-phase to two-phase coordinate transformation. Hence, the instantaneous reactive power compensation system based on the proposed theory is essentially simpler than any conventional reactive power compensation system based on such coordinate transformations.
    In this paper, we apply the Cross vector theory to three-phase four-wire system. Since there is a neutral line in three-phase four-wire system, simplification of a reactive power compensation system is very difficult. Here, the authors develop a new method, that is, neutral line current separating and combining method. Applying the neutral line current separating and combining method to the Cross vector theory, control system of the instantaneous reactive power compensator for the three-phase four-wire system can be simplified.
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  • Hirotami Nakano, Masayuki Jibiki, Akira Nabae, Yositsugu Okamura
    1995 Volume 115 Issue 6 Pages 735-742
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    An ideal inverter should have sinusoidal voltage and current outputs. Generally, output voltages of a voltage-source PWM inverter contain high level switching frequency harmonics due to the PWM operation, while output currents are kept nearly sinusoidal. High level harmonics contained in output voltages of a voltage-source inverter cause acoustic noises, iron losses and electromagnetic interferences. An L-C filter was used to suppress the switching frequency harmonics; however, there is reason to fear resonance in the L-C filter. Accordingly, in order to remove harmonics of the L-C filter resonance frequency, the authors add a voltage feed-back loop.
    A conventional system can operate without difficulty within 50Hz. However, with accompanying increases of the output frequency, output voltages are largely delayed and reduced by a high-pass filter inserted in the feed-back loop. These problems are caused by a high-pass filter inserted in the feed-back loop. Accompanied by the inverter output frequency, a high-pass filter can not remove the fundamental component perfectly. As the result, a small fundamental component is fed back, which causes a delay and decrease of output voltage.
    In this paper, the authors propose to apply coordinate transformation to a high-pass filter inserted in the feed-back loop. As a result, the proposed system has realized the ideal filter which can suppress fundamental frequency components perfectly, and characteristics of the inverter with sinusoidal voltage outputs are greatly improved. And theoretical analysis, simulations and experiments showed satisfactory results.
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  • Kiwamu Hino, Kenji Watanabe, Hiromu Ariyoshi
    1995 Volume 115 Issue 6 Pages 743-750
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A new full resonant ZCS forward converter intended to improve undesirable performances of the conventional ZCS converter is proposed and many of operational items, such as ZCS domain, amplitude variation, efficiency, dynamic load effect and cross regulation, are successfully confirmed by experiments and theoretical analysis. The converter is possible to get ZCS action exploiting a L-C series resonant circuit putting in parallel with the transformer and a small inductance putting in series with the transformer. It is shown that the new converter is applicable to the power supplies for which good performances with respect to dynamic load effect, noise and efficiency are requested, and has possibilities realizing low noise, high frequency operation and then miniaturization. Furthermore, the simplified design method which is useful on case of early step of designing converter is given.
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  • Shinya Matsunami, Naoki Yamamura, Yuzuru Tunehiro
    1995 Volume 115 Issue 6 Pages 751-757
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Active filter (AF) is the apparatus to eliminate harmonic currents in the distribution line by using switching devices. There are two type of AF, the voltage source type and the current source type. The voltage source type is common for realization today. But we have been studying and already reported AF of the current source type for its rapid and precise controllability of output current and little interference between AF and the distribution line.
    In this paper, we propose two scheme to improve its performance and to reduce its capacity.
    To improve the performance of AF, we changed the PWM carrier from triangular wave to sawtooth wave, but its switching times are same in some range. By using the sawtooth PWM carrier wave of 5kHz (corresponding to triangular wave of 2.5kHz) and the multiple connection of AF, it can eliminate harmonic currents of less than 19-order in distribution line.
    To reduce the capacity of AF, we propose AF which eliminates only harmonic currents. By using other apparatus for reactive power compensation, the more economic system can be achieved.
    The experimental results of the tested apparatus show that these methods are useful for realization of AF.
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  • Hidehiro Hara, Teruo Tsuji, Takurou Mochizuki, Yoshiaki Tanaka
    1995 Volume 115 Issue 6 Pages 758-764
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In recent years, PM motors are used as robot arm actuators. By the way robot arm has nonlinear load torque related to position angle. To get accurate and speedy control, simple rules are needed. Exact linearizing technique gives linearized state equations directly from original state equations. But it has singular points at start and destination of arm. Combining decoupling control singular point disappear from state equation, and all the state space becomes controllable.
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  • Mutuwo Tomita, Shinji Doki, Shigeru Okuma
    1995 Volume 115 Issue 6 Pages 765-774
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    It has been known that a state equation of a blushless DC motor is a nonlinear one. Recently, new linear state equation and a position and velocity sensorless control system with the full-order observer based on the equation has been proposed. But the pole assignment of the observer has not been presented clearly. In this paper, we propose an adaptive sliding observer for this linear state equation and present clearly the pole assignment of the sliding observer for robust flux estimation with estimated velocity error. The simulation shows that the proposed system is very useful.
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  • Kenji Tamaki, Yasuhiro Matsuoka, Masato Uno, Takeshi Kawana
    1995 Volume 115 Issue 6 Pages 775-783
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper presents a new discrimination procedure of signal waveforms, based on wavelet theory, for the inspection of rotating machinery. The Wavelet Transform decomposes signals into time-frequency space, not into mere frequency space, limited by the Uncertainty Principle. This decomposition permits time-frequency analyses and provides a more flexible means of signal processing than before.
    To examine a rotary compressor pump, particular waves in the rotational load torque signals that correlate with failure modes are discriminated from one another and evaluated. To extract the focal waves, the signal is decomposed with wavelets and then only the particular waves, such as impulses, are reconstructed from a selected set of wavelet coefficients. This is called time-frequency space filtering. The wavelet local modulus maxima are used to open a time-frequency window through which only the focal waves can pass with high fidelity. The maxima have information of the reflection points of the wave at each resolution that represent its waveform.
    The experimental results show the effectiveness of the maneuver.
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  • Yukio Goto, Kiyotoshi Komaya, Toyoo Fukuda
    1995 Volume 115 Issue 6 Pages 784-792
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In urban street networks, traffic flow is seriously affected by traffic signals. A traffic signal is controlled by using three parameters, cycle, split and offset and these parameters should be determined based on traffic conditions.
    This paper discusses on the optimal signal control in small street networks. First, we apply genetic algorithm to the optimization of signal control parameters. In this approach, we use the microscopic traffic simulation for calculating fitness value. Secondly, we analyze the optimal signal control in small networks as comparing with the results of conventional approaches and prove effectiveness of our proposed approach. Further, we propose the practical method of setting signal control parameters based on traffic conditions.
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  • Hideo Dohmeki, Hirofumi Satomi, Takao Iwasa
    1995 Volume 115 Issue 6 Pages 793-799
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A cylindrical linear pulse motor (CLPM) of a new construction was proposed in this paper. The conventional CLPM, which has a permanent magnet between A phase and B phase stator, has a problem that thrust unbarance occurs becouse the magnetic flux pass of out or pole is longer that of the inner poles. This paper proposes a CLPM of completely new construction, in which the field magnetic flux and the armature magnetic flux are perpendicularly intersecting each other as a result of a restructured magnetic circuit. This new CLPM has the same magnetic field as the stepping motor, and has the distinctive characteristic of being available in a multi-phase design as well as the conventional two phase design. A five phase ten pole CLPM was experimentally manufactured and was measured the static thrust to identify its basic characteristics. The experiment confirmed the theory that the torque did not differ from phase to phase and that controllability equal to that of the stepping motor was obtainable. The CLPM we proposed here is effective as an alternate linear electromagnetic actuator for electrical servos of air actuators such as air cylinderes.
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  • Akio Taguchi
    1995 Volume 115 Issue 6 Pages 800-805
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    60Hz track circuits have been used for DC electrified conventional lines of Japan Railway. The train detection sensitivity of the track circuit is decided by its impedance and distribution. The model to calculate the train detection sensitivity is designed about 60 years ago and being applied still now. Nevertheless there are several occasion, where the model cannot be applied. For example, a short distance track circuit sometimes cannot be applied. To solve this problem, the author propose a new model and constants of the track circuit. The new type model and constant can be applied not only to the short distance track circuit, but also to a long distance track circuit including a turnout. With the help of a field measurement, the new model is proved that it can be applied all the kinds of 60Hz track circuits without any problems.
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  • Kazushi Tomii, Mitsuhide Maeda, Takuji Keno, Haruhiko Yamamoto, Toshir ...
    1995 Volume 115 Issue 6 Pages 806-811
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The turn-off time (tgq), forward voltage drop (VTM) and the power dissipation at switching operation of static induction (SI) thyristor using a normally-off planer gate structure was improved by lifetime control using proton irradiation. In proton irradiation, defects form locally in silicon, and the depth of the defects distribution can be controlled by the energy of the proton beam.
    It has been found that the performance trade-off between tgq and VTM and the high temperature performance in the power dissipation of the SI thyristor depends on the depth of the defects formed by proton irradiation. If the defects were formed in the anode region then the power dissipation was nearly constant at from room temperature to 100°C.
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  • Kazuya Ogura, Yasuhiro Yoshida, Yasuhiro Yamamoto, Tetsuo Yamada
    1995 Volume 115 Issue 6 Pages 812-813
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Hayato Oishi, Hidehiko Okada, Kouichi Ishizaka, Ryozo Itoh
    1995 Volume 115 Issue 6 Pages 814-815
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Teruyuki Izumi, Mutsuo Nakaoka, Etsuhiro Kimura
    1995 Volume 115 Issue 6 Pages 816-817
    Published: May 20, 1995
    Released: December 19, 2008
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  • Katsumi Uezato, Tsuyoshi Shimabukuro, Tomonobu Senjyu
    1995 Volume 115 Issue 6 Pages 818-819
    Published: May 20, 1995
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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