IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 112 , Issue 10
Showing 1-17 articles out of 17 articles from the selected issue
  • Toshio Ojima
    1992 Volume 112 Issue 10 Pages 915-918
    Published: October 20, 1992
    Released: December 19, 2008
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  • Nobuhiro Hamada
    1992 Volume 112 Issue 10 Pages 919-923
    Published: October 20, 1992
    Released: December 19, 2008
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  • Tadsahi Nakamaru
    1992 Volume 112 Issue 10 Pages 924-926
    Published: October 20, 1992
    Released: December 19, 2008
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  • Itaru Nakamoto
    1992 Volume 112 Issue 10 Pages 927-931
    Published: October 20, 1992
    Released: December 19, 2008
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  • Shigeru Nagata
    1992 Volume 112 Issue 10 Pages 932-935
    Published: October 20, 1992
    Released: December 19, 2008
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  • Kuniomi Oguchi, Eiichi Ikawa, Yoshitaka Tsukiori
    1992 Volume 112 Issue 10 Pages 936-942
    Published: October 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A novel inverter system to synthesize three-phase sinusoidal currents with a combination of two units using two phase-shifted single-phase series resonant inverters is proposed. The structure and operating principle of the proposed system are described and its features are compared with conventional inverters. Each unit consists of a high-frequency single-phase reasonant inverter, a single-phase transformer for electrical isolation, a rectifier, a low-pass filter, and a three-phase inverter to unfold the DC link current. The system has advantages of both a high-frequency resonant inverter and a high-frequency AC link. The simulated and experimental results show that the system can produce high quality output current waveforms. Effects of the cutoff frequency of the low-pass filter in the DC link on the output waveforms are, also, discussed.
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  • Takeo Ikai, Ichiro Fujita, Kiyohito Hashiguchi
    1992 Volume 112 Issue 10 Pages 943-949
    Published: October 20, 1992
    Released: December 19, 2008
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    This paper describes some relations between electrical input power and demensions of EDM craters. To our authors' Knowledge, there were no reports taking into account expansion of arc column for metal heating by transient electrical input power. We have estimated expansion of virtual heat input radius in EDM energy range and proposed to use the time average of the thermal expansion as heat input radius for material heating. To determine crater profile, the dimensions of melting zone were calculated from the temperature distribution in the materials, estimated by using the equation of thermal conduction. Comparison between calculated EDM crater dimensions and experimentally obtained ones has shown reasonability of our proposal. Our study has made it possible to calculate time dependence of expansion of arc column for EDM region. It has become clear that the virtual heat input radius is larger than crater radius, and, in addition, that removal amount of work material with repetitional discharge can be estimated from the removal amount with impulse discharge.
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  • Yukihiko Sato, Pekik Argo Dahono, Teruo Kataoka
    1992 Volume 112 Issue 10 Pages 950-958
    Published: October 20, 1992
    Released: December 19, 2008
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    Resonant DC link inverters, which can realize high switching frequency power conversion without switching loss in principle, have been proposed and investigated. In such inverters, power loss is produced in the resonant circuit though power loss in the main circuit is reduced by the amount of the switching loss Therefore, an evaluation method of the total power loss should be established from the view point of efficiency.
    In this paper, first we summarize the circuit operation and the control method of the resonant DC link inverter. Based on this, the expressions for various power losses produced both in the inverter main circuit and in the resonant circuit are derived. In this derivation, since the turn-on signal for an inverter arm is assumed to be determined only by comparison of the actual output current and its reference, a concept of probability is introduced for the turn-on signal of each inverter arm.
    As an investigation of the resonant reactor, which affects the total power loss significantly, two types of reactor are constructed and the frequency characteristics of their resistances are clarified experimentally.
    To confirm the validity of the expressions for losses derived in this paper, a comparison of the calculated and measured total losses is made for an experimental system.
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  • Shigeyuki Funabiki, Shinichiro Senoo
    1992 Volume 112 Issue 10 Pages 959-965
    Published: October 20, 1992
    Released: December 19, 2008
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    In recent year, fuzzy control has been applied to various industrial field and its availability has been reported. The purpose of application of fuzzy control is to realize the control performance using the experience of expert (control rules) with “If … Then …” rules. Now, easier operation and excellent performance of AGV (Automated Guided Vehicle) at high speed are required. The steering control of AGV with the conventional PI controller, however, becomes difficult to achieve the excellent performance. Therefore, the authors propose the steering control of AGV using fuzzy control, which can obtain stable steering control.
    In this paper, we discuss the optimal position of guide sensor and make an experiment in the straight traveling. We introduce many rules for fuzzy reasoning and discuss how to choose the rules for fuzzy reasoning and achieve the stable steering control. Then, the experiments of steering response for the step change of guide tape are carried out with the fuzzy control as well as the conventional PI control. The results of steering control using fuzzy control are better than that using PI control. It is confirmed that the proposed steering control is very available.
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  • Hirokazu Sato, Tatsuo Makino, Nobuyuki Matsui
    1992 Volume 112 Issue 10 Pages 966-971
    Published: October 20, 1992
    Released: December 19, 2008
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    In the field of motion control, a torque ripple causes a serious problem. Since a direct drive motor with a magnet rotor uses a rare-earth magnet, the torque ripple is more serious than that of the conventional servomotors. The paper presents an auto-compensation of torque ripple using a software-implemented torque observer. The frequency and amplitude of torque ripple can be obtained in the controller by using the estimated torque from an observer, and the autonomous generation of compensating current component for a torque ripple is possible. The proposed algorithm has been verified by experiments.
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  • Tsutomu Maeda, Hiroshi Fujita
    1992 Volume 112 Issue 10 Pages 972-976
    Published: October 20, 1992
    Released: December 19, 2008
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    The simple structured linear actuator considered in this paper is based on the model, which was called the single-phase oscillating motor, proposed by Jayawant. We have already reported about the static and the kinetic characteristics of the actuator of our model about two cases considered and not considered the magnetic saturation when it was driven by an AC source. Although the theoretical procedue to calculate the characteristics is very simple, the calculated results, in both cases, have shown close agreement with the experimental ones. To improve the actuator for the practical use, some methods will be considered and one of them is to use a DC source instead of an AC source. Using the charged capacitor as a DC supply, a instantenious large current flows easily in the exciting coil in comparison with the case of an AC supply.
    In this paper, qualitative explanation of the ring motion and calculated results of the ring speed which have good agreement with experimental results are reported.
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  • Fumio Matsumura, Masayuki Fujita, Kazuhiro Hatake
    1992 Volume 112 Issue 10 Pages 977-983
    Published: October 20, 1992
    Released: December 19, 2008
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    This paper deals with the problem of an unbalance vibration in magnetic bearings. Firstly, by assuming that the rotor with an unbalance is a rigid body, we develop a rigorous modeling of a magnetic bearing system in which the rotation of the rotor is (not on its geometrical axis, but) on its axis of inertia. In result, it is shown that, when the rotor rotates around its axis of inertia, sinusoidal disturbances due to the unbalance of the rotor affect the system dynamics and the measured output. These disturbances can be described as the output of the autonomous system. In this case, a part of the state variables of the system to be controlled cannot be measured. Here, our objective is to construct a controller which preserves internal stability and rejects the above-stated disturbances in a wide speed range. The problem is formulated and solved within a framework of the so-called “output regulator with internal stability” theory. The state variables which can not be available are estimated with a minimal order observer. Finally, we present a numerical example for a fixed rotation speed and a result of its experiment.
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  • Kiyohito Yamasawa, Hitoshi Mutai, Yukinobu Kajita
    1992 Volume 112 Issue 10 Pages 984-988
    Published: October 20, 1992
    Released: December 19, 2008
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    Recently, various types of a magnetic actuator have been developed. The actuator has to be designed to satisfy the specification of the thrust, the stroke, the size and so on.
    In the automobile industry, the size of a solenoid actuator can be reduced by improving the coil configuration and the magnetic-circuit form without decreasing the thrust. The thrust, however, is not evaluated systematically.
    This paper proposes a new disk-type multipolar solenoids and analyzes the thrust by using the finite element method. The calculated values show a good agreement with the experimental ones. For a short stroke range with a high-magnetomotive-force excitation, the colenoid confignration is appropriate, and for a long stroke a usual solenoid excitation is useful. In a practical stroke range of 0.2_??_0.3mm, however, the multipolar solenod has a comparatively large thrust.
    Furthermore, the colenoid configuration can yield a fast response of the movement because the acceleration of the actuator increases with the number of the coils.
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  • Ryuichi Oguro, Teruo Tsuji, Koichi Oya
    1992 Volume 112 Issue 10 Pages 989-996
    Published: October 20, 1992
    Released: December 19, 2008
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    Magnetic levitation systems are suitably applicable to transfer systems in an ultra clean room because of their contactless construction. In a levitation system by magnetic attraction forces, the attraction force has nonlinear characteristics with respect to magnetizing current and the gap length between the magnet and the levitated vehicle. Since it is usually equipped only with position sensors to measure the gap length, an observer is adopted to know the velocity of the vehicle. One of the problems of the system which contains the observer is the modeling error which has an undesirable influence on a decoupling control method and, as a result, causes instability of the system. Electrical causes of modeling errors are due to a change of the gain in a current amplifier, the influence of leakage flux and a linearizing error in a magnetic circuit. Mechanical causes are due to the changes of the mass and the moments of inertia by changes of materials on the vehicle. The modeling error by these causes can be formulated as the error between the real attraction force and the reference input for it. In this paper, the electrical and the mechanical changes mentioned above are formulated as the change of the parameters of the system, and then the changing parameters are identified by the observer whose coefficients contain the control input variable. This method can be applied to the case where a constant disturbance, either known or unknown, exits. Appropriateness of the proposed theory is confirmed by simulation and also experiments, using a system which has 4 magnets for levitation and a linear motor for transfer of the vehicle.
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  • Jianzhong Chen, Osami Tsukamoto
    1992 Volume 112 Issue 10 Pages 997-1005
    Published: October 20, 1992
    Released: December 19, 2008
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    This paper is investigating characteristics of an attractive type magnetic levitation system with 3φ AC electro-magnets. The system has iron rails with primary windings on the ground and levitation magnets with secondary windings placed on the levitated object, and the object is levitated by feed-back control of magnetically induced current of the levitation magnet. In this system, the levitated object has no part contacting the ground and needs no on-board battery.
    In the paper, dynamic and static characteristics of the AC levitation system with 3φ AC magnets are analyzed and a transfer function of the system is given. The transfer function is determined by the magnet constants which can measured by using the method to measure constants of a transformer. The dependency of the system characteristics and stability on the magnet and the feed-back constants are discussed based on the analysis. To investigate the validity of the analysis, an experiment has been performed by making a one-point support model system. Experimental results well agreed with the analytical results considering that the system is non-linear and has AC coupling circuit, and we consider that the analysis described in the paper is valid.
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  • Kenji Inoue, Hideo Yamashita, Yukio Ohnogi
    1992 Volume 112 Issue 10 Pages 1006-1007
    Published: October 20, 1992
    Released: December 19, 2008
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  • Mitsuo Hasegawa, Kunikazu Inoue, Toshimitsu Hirai, Masami Hayashi, Isa ...
    1992 Volume 112 Issue 10 Pages 1008-1009
    Published: October 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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