IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 111 , Issue 6
Showing 1-16 articles out of 16 articles from the selected issue
  • Kenta Yoshii, Sadayuki Otomi, Kengo Sugiyama, Masayoshi Chiashi
    1991 Volume 111 Issue 6 Pages 423-426
    Published: June 20, 1991
    Released: December 19, 2008
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  • Mitsuru Matsumoto
    1991 Volume 111 Issue 6 Pages 427-428
    Published: June 20, 1991
    Released: December 19, 2008
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  • Toshihiko Nishimura
    1991 Volume 111 Issue 6 Pages 429-430
    Published: June 20, 1991
    Released: December 19, 2008
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  • Shigeru Nakazi
    1991 Volume 111 Issue 6 Pages 431-432
    Published: June 20, 1991
    Released: December 19, 2008
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  • Yoshihisa Ito, Takeshi Furuhashi, Shigeru Okuma, Yoshiki Uchikawa
    1991 Volume 111 Issue 6 Pages 433-440
    Published: June 20, 1991
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Performance of a digital current controller for a PWM inverter is degraded by changes of load impedances and delay necessary for calculation of the controller.
    This paper presents a digital current controller for a PWM inverter using a neural network. The current controller automatically tunes its gains to the optimal ones for varying load impedances and compensates the calculation delay. Stability condition for the learning rate of the neural network is analyzed. The feasibility of the new controller is verified by simulations and experiments. Stable region of the current controller with deviations of the load impedances is obtained by simulations.
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  • Hisashi Takahashi
    1991 Volume 111 Issue 6 Pages 441-447
    Published: June 20, 1991
    Released: December 19, 2008
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    Modern control systems for DC Servomotors mainly employ a digital circuit. However, in these systems an analog circuit is used for detecting the armature current. The combination of digital and analog techniques causes hardware complexity.
    In this paper a new digital method to estimate the sum of the armature resistance and output resistance of a PWM operated drive is proposed, presenting some test results. Since in this feedback control scheme the voltage applied to the motor is always varying, speed and pulse-width data, which are continuously changing and sampled once a pulse cycle, are used for the estimation of the equivalent armature resistance. This estimation method is based on the comparison of 1, 000 measured speed data and the computed values from the same number of pulse-width data and several assumed parameters.
    This study yielded the following conclusions: (1) not only the temperature variation of the armature resistance but that of the output resistance of a drive circuit has a large influence on the system performance, (2) the sum of these resistances can be obtained using a full-digital estimation method, and (3) this technique can be applied to a full-digital LSI for motor control.
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  • Yoji Yamada, Nuio Tsuchida
    1991 Volume 111 Issue 6 Pages 448-454
    Published: June 20, 1991
    Released: December 19, 2008
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    This paper deals with a system with originally developed visual and proximity-tactile sensors mounted on a 2-link manipulator. A sensor integration system for autonomous collision avoidance movements in real time is proposed firstly and the hierarchical structure of the system is described. The strategy to control the manipulator is nextly proposed, which includes how to plan a global path by using visual sensor data and a local path correction procedure with proximity-tactile sensor signals directly given to the servo controller. Finally, an experimental result is shown in which the manipulator is controlled according to the strategy. The time spent for the system to do with a stair-shaped obstacle was about 22s in which only 3.3s was required for calculating a global path, which shows the effectiveness of the developed sensor integration system.
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  • Hiroyuki Ogiwara, Mutsuo Nakaoka
    1991 Volume 111 Issue 6 Pages 455-464
    Published: June 20, 1991
    Released: December 19, 2008
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    This paper is mainly concerned with a performance analysis and a design method of a newly-developed zero-current switching quasi-resonant high frequency inverter (ZCS-QRI) using a single reverse-blocking power device (high-frequency GATT). As a matter of fact, GATT is replaced by the latest MOS-gate power semiconductor devices, MOSFET, IGBT, MCT and Bi-MOSGTO Thyristor.
    The frequency-modulated single-ended inverter circuit, which incorporates an auxiliary diode & large reactor cascade branch in parallel with a resonant capacitor connected into the transformerlink series-resonant tuned tank load circuit can stably and efficiently operate in the frequency range from 20kHz up to 50kHz or so. It is proved that the ZCS-QRI is more suitable for several kW induction-heating and-melting power supplies and high-intensity ultrasonic generator, and switched-mode DC-DC converters.
    This simple high-frequency ZCS-QRI for induction-heating load model is analyzed introducing normalized resonant and load circuit parameters and control variable on the basis of the computeraided simulation. The load and frequency regulation characteristics of ZCS-QRI and ZCS operation range are illustrated with a normalized expression in addition to voltage and current peak values and stresses of the power semiconductor device. The practical computer-aided design procedure using the inverter characteristics in steady-state expressed in the normalized technique is demonstrated and discussed including a design example. The simulation results of ZCS-QRI are illustrated and compared with the experimental results in trially-produced breadboard.
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  • Toshihisa Shimizu, Gunji Kimura, Mitsuo Shioya
    1991 Volume 111 Issue 6 Pages 465-474
    Published: June 20, 1991
    Released: December 19, 2008
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    At present, a high frequency induction heating system usually consists of a high frequency power source and a heated load circuit. But some systems are necessary to heat up two or more loads.
    In such a case, there are many problems. For an example, the same number of the power source or switches, changing loads, are required. In addition, many high frequency power transmissionlines should be laid for the plural load circuits.
    The authers offer a new system, which can be able to supply the high frequency power slectively and effectively to two induction heating circuits, the system is composed of a high frequency voltage type inverter, a parallel resonant load circuit and a series resonant load circuit, and they are connected in series by the distributed constant lines, having the specific length.
    This paper describes the operating principle of the system and the optimum operating conditions. And also through the analyses of the operating characteristics of the system, the paper explaines the facts that the effective and selective transmissions of the high frequency power to the loads are available and the minimum interference between the loads for the supplied power divisions is accomplished.
    Finally, the theoretical simulation waveforms are compared with the actual waveforms obtained from the test equipment, having the output ratings of 1 to 2MHz and 1kW, and they correspond with each other. So it is clarified that the theory described in the paper is reasonable.
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  • Tatsuo Tani, Hiroyuki Yokouchi
    1991 Volume 111 Issue 6 Pages 475-481
    Published: June 20, 1991
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    As a part of various electric power sources, the photovoltaic power system are expected to be one of the important power systems in a near future. The authors have developed the computer program of optimizing grid-connected photovoltaic power system from points of view of daily electric load and electrical energy cost. In a grid-connected photovoltaic power system (PV system), electric power generated is supplied to distribution line and load.
    In this paper, the optimum design of typical private residence with PV system in Tokyo is calculated by using the various system performance models, the cost models, the daily electric load pattern, environmental data and so on.
    It was found that the capacity of PV system is 2.6kW when the selling price of surplus power and buying price of shortage one are equivalent. And then, the electrical energy cost of the optimum PV system at 2, 000 A. D. is estimated to be about 35yen/kWh.
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  • Tsutomu Mizuno, Hajime Yamada
    1991 Volume 111 Issue 6 Pages 482-488
    Published: June 20, 1991
    Released: December 19, 2008
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    This paper deals with the analyzing results of static thrust of a permanent magnet type linear synchronous motor (LSM) from both sides of theory and experiment. It is necessary to make clear how the width and taper length of the permanent magnet affect static thrust characteristics of a LSM, because it was not so definite.
    In this paper, the following points are discussed:
    (1) The theoretical expressions of the static thrust of the LSM were derived from the permeance analysis method and finite element method(FEM).
    (2) The width and taper length of the permanent magent which give influence on harmonic components of static thrust were investigated through the FEM. The error of calculated value through the FEM is found within 10% of measured value of speed electromotive force and static thrust.
    (3) The error through the permeance analysis method is found within 20% of measured value. The calcurated value in the permeance analysis method corresponded likely to the mean static thrust of measured value.
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  • Teruo Tsuji, Ryuichi Oguro, Kazuo Takahashi
    1991 Volume 111 Issue 6 Pages 489-496
    Published: June 20, 1991
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In the field of semiconductor products such as VLSI, there arise needs for ultra clean environments in microscopic processing. One of factors of polusion is in production equipments. That is, the polusion is caused by the rubber parts in the equipments. One of techniques of solutions for this problem is to use a magnetic levitation system for noncontact transfer. In this paper, a magnetic levitaion control by 4 points attraction is presented. The problem is a nonlinearity at magnetic circuits with respect to the magnetic force especially when relatively nallow gap suspentions between magnets and the levitated vehicle is considered. In fact, the suspention gap of the experimental system is designed to be 0.8mm. Even though there are some methods for linearization and these give the effectivity for the levitation controls, the method presented here is also another effective one which does not use linearization for magnetic force. Appropriateness of this idea is prooved by experimental results.
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  • Toshiyuki Taniguchi, Kei Ohtsuka, Kimihiko Takasugi
    1991 Volume 111 Issue 6 Pages 497-498
    Published: June 20, 1991
    Released: December 19, 2008
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  • Atsuo Kawamura, Hiroshi Minoura
    1991 Volume 111 Issue 6 Pages 499-500
    Published: June 20, 1991
    Released: December 19, 2008
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  • Lu Ding, Mustuo Nakaoka, Yasumasa Ogino
    1991 Volume 111 Issue 6 Pages 501-502
    Published: June 20, 1991
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Lu Ding, Mutsuo Nakaoka, Yoshihiro Hatanaka
    1991 Volume 111 Issue 6 Pages 503-504
    Published: June 20, 1991
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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