IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 121 , Issue 5
Showing 1-15 articles out of 15 articles from the selected issue
  • Eisuke Masada
    2001 Volume 121 Issue 5 Pages 535-540
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Hiroaki Sugihara
    2001 Volume 121 Issue 5 Pages 541-549
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    It becomes very important that the potential delays in the delivery dates are estimated as early as possible and the adjustments to the production periods are applied as little as possible only to the higher priority items in order to maximize the effectiveness. However, just like planning the most optimized schedules on the job shop production floors, quantitative decision making on load change actions has been a very difficult problem. Thus, in order to solve such problems, we have proposed CSM (Concurrent Scheduling Method) as a means to plan schedules. Under CSM, the optimum schedule is planned to maintain the delivery dates while solving resource conflicts. In this article, a new technique is proposed in order to adjust production periods of projects (to be called as concurrent projects, hereafter), which share resources and are processed concurrently by investigating the established critical paths while a function is added to CSM.
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  • Isao Kikutani, Ryuhei Okuno, Kenzo Akazawa
    2001 Volume 121 Issue 5 Pages 550-556
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The purpose of this study was to develop a linear DC motor capable of generating greater thrust. A new type of coil configuration consisting of magnetic and non-magnetic wires was proposed. The magnetic wire enhances the magnetic flux density in the magnetic circuit, and the non-magnetic wire controls the direction of magnetic flux in the magnetic wire. Electric current is applied to the magnetic wire.
    The software simulation showed that the averaged magnetic densities of the magnetic wire and of nonmagnetic wire, just above the magnet, were 0.615T and 0.075T, respectively. The thrust of the linear DC motor improved approximately 30% comparison with the conventional linear DC motor consisting of copper wired coil only at the same power supply.
    The measured thrust of the prototype linear DC motor showed approximately 80% against the estimated thrust because of differences between the analysis model and the actual form.
    Suitable width ratio between the magnetic wire and the non-magnetic wire, and reasonable clearance between outer diameter of coil and inner diameter of outer yoke were estimated.
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  • Oliver Woywode, Henry Güldner
    2001 Volume 121 Issue 5 Pages 557-562
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper aims at showing the benefits of a statistical analysis applied to DC-DC converters. A boost converter under current-mode control operating chaotically was being used as an example. Theoretical results are verified by measurements. Parallels to results other researchers are drawn. New simple expressions for the DC value of the boost's input current and the AC power are proposed. The statistical approach covers the periodic and aperiodic behavior quite naturally. It reveals that almost all AC power is contained in the chaotic part of the input current. Impacts on meeting electromagnetic interference regulations are suggested.
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  • Shizumasa Okudaira, Kouki Matsuse
    2001 Volume 121 Issue 5 Pages 563-568
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    When such an uneven work as a gear is hardened by induction heating, it is known that concave portions of the work are heated at a lower frequency and convex portions are heated at a higher frequency which is almost three times as much as the lower frequency. It is desirable that the work is heated by both frequencies at the same time but it is impossible for a conventional resonant inverter. Then we propose a dual frequency output quasi-resonant inverter which positively generates higher harmonics. The proposed inverter has a feature that the 1st order (fundamental) current and the 3rd order current are controlled by manipulating the shorting time of the resonant capacitor. The present inverter is applicable to dual frequency induction heating.
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  • Koichi Matsuoka, Minoru Kondoh, Shigetomo Shiraishi, Kazunori Yamawaki
    2001 Volume 121 Issue 5 Pages 569-576
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    As a new concept train for the next generation, a gauge change train, which can go through standard gauge Shinkansen line to narrow gauge conventional line, have been under development. Its driving system is required to be simple in structure to realize the adjustable wheelset motored truck, and to produce a high performance for Shinkansen in a narrow gauge truck space. As one of the valid driving system for it, we selected a wheel-mounted direct drive traction motor using rare earth permanent magnet. Through several trial manufactures and experiments, we completed a traction motor for the high speed experimental train. This paper shows the construction and the test results of the developed traction motor.
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  • Tadashi Yamaguchi, Yoshihiro Kawase, Akihiro Fuseya
    2001 Volume 121 Issue 5 Pages 577-583
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Permanent magnet linear synchronous motors are widely used in the linear drive systems. For the optimum design of linear motors, it is necessary to obtain the thrust characteristics accurately. In this paper, we calculate the thrust characteristics of a Surface Permanent Magnet Linear Synchronous Motor (SPM-LSM) using the 3-D finite element method taking into account eddy currents in the cores, and the results are compared with the 2-D calculated and the measured ones. Consequently, it is clarified that the 3-D finite element analysis is very useful to obtain the thrust characteristics of the SPM-LSM.
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  • Tomohisa Nadae, Yasunori Kanamaru, Yoshifumi Amemiya
    2001 Volume 121 Issue 5 Pages 584-589
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A method for elimination of higher harmonics is presented here. It has the p pulses in a half-period of an inverter output voltage, and they are shifted appropriately in each period. When n is the highest order of the eliminated harmonics, the relation between n and p is p=(n+1)/2. In this paper, on-off phases of each pulse are determined by the initial values calculated beforehand, which are j=1, 2, …, p times π/(n+2) in a quarter-period. In this inverter, the further order of harmonics eliminates than that of Patel and Hoft can be eliminated. For example, a list of the on-off phases for eliminating all of the higher harmonics under the 25th is seen. In addition, the remained higher harmonics further reduce when authors optionally choose (n+2) three times odd number in the three-phase inverter, and the variable output voltage inverter using one unit of PWM covering a range from null to about 1.15 times the DC supply voltage can be obtained.
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  • Toshiko Nakagawa, Tadashi Furukawa, Atsushi Yamada
    2001 Volume 121 Issue 5 Pages 590-596
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In the previous paper, a novel type of semi-active damper that is composed of a cylinder injected with Magnetic Fluid (M. F.) and a magnetic flux controller was proposed for improving the ride comfort of trains. In this paper, at first, a modified model considering nonlinear characteristics of M. F. such as a Non-Newtonian-Fluid is proposed. Next, in order to enhance the control effects, two kinds of improvements are made in the semi-active damper. One is to change the voltage control input to an electromagnet into the current control input. The other is to expand the control range for the M. F. damper by means of feeding a bias current to the electromagnet. Finally, the effects of the improved semi-active damper are shown by various digital simulations and vibration experiments.
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  • Hiroshi Murakami, Yukio Honda, Shigeo Morimoto, Yoji Takeda
    2001 Volume 121 Issue 5 Pages 597-603
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper reports on the IPMSM rotor configuration with concentrated winding stator. The inductance of concentrated winding is higher than the distributed winding and flux density of the concentrated winding contains the higher harmonic components. That generates the higher iron losses than the IPMSM with distributed winding stator. We discuss the three types of interior magnet rotor which has the different saliency ratio. We found that in the lower speed range, the highest saliency rotor is suitable to decrease the load current and copper losses. On the other hand, in the higher speed range, the higher salient rotor generated greater iron losses and decreased the motor efficiency. In the higher speed range, the lower salient rotor is suitable to decrease the iron losses and to increase the motor efficiency.
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  • Fumihiko Saitoh
    2001 Volume 121 Issue 5 Pages 604-611
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The normalized correlation matching is often applied to image processing for alignment, measurement and inspection of electrical components in the manufacturing lines. In the normalized correlation matching, a template image is set by the manual operation before the matching process. Namely, the contents and the size of a template image are determined by the human sense. This paper proposes a method to perform a high-speed normalized correlation matching by extracting a partial template area automatically that is effective in the image matching. A partial template area is extracted in order to keep the reliability of the matching using the genetic algorithm. The experimental results show that the partial template area including an image pattern that was useful for the matching was extracted by the proposed method and the processing time for image matching was reduced to 8.9%.
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  • Hirofumi Kiyotake, Hidehiko Okada, Kouichi Ishizaka, Ryozo Itoh
    2001 Volume 121 Issue 5 Pages 612-613
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A novel single-phase voltage-doubler rectifier operating in the switch-mode is presented. This is based on a diode pump circuit, in which the voltage across the boost capacitor adds to the supply to pump twice the peak supply voltage onto the output capacitor, and an only power switching device provides the necessary control over the current. The arrangement tested, using an insulated-gate bipolar transistor and a controller for output voltage, is implemented to investigate the operation. The experimental results confirm that the input current can be sinusoidally waveshaped with a near-unity power factor under the output voltage duplication.
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  • Shoji Moriyasu
    2001 Volume 121 Issue 5 Pages 614-615
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    When a line-to-lire short-circuit occurs, the positive-sequence-, the negative-sequence-and the DC-current flow in the armature winding of synchronous machine. The negative-sequence current is limited in JEC-114, as this current causes the induced current and the overheat on the surface of the rotor. The DC- current causes also the overheat on the surface of the rotor in a similar reason. This paper proposes the calculation method for the equivalent short-time negative sequence current considering both of the negative-sequence current and the DC-current.
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  • Akio KIMURA, Tomoyuki MATSUZAKA, Yukio KAGAWA
    2001 Volume 121 Issue 5 Pages 616-617
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A FIR type neural network that replaced the weight of the neural network with the FIR (Finite Impulse Response) type synapse was proposed previously, which is reported to be excellent for identification and prediction comparing with the usual FF (Feed Forward) type neural network. With reference to this idea, this paper presents the IIR (Infinite Impulse Response) type neural network that has delay elements to both input layer and output layer. We calculated the magnetic pole optimization using the proposed neural network. The result showed that the learning iteration could be reduced in comparison with the neural network of the usual FF.
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  • Kazumi Kurihara, Yuichiro Baba, Tohru Nakada, Tomotsugu Kubota, Hong W ...
    2001 Volume 121 Issue 5 Pages 618-619
    Published: May 01, 2001
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper presents the best choice of a time step for the starting performance analysis of self-starting permanent magnet synchronous motor in which the time-stepped finite element technique is used. The agreement between computed and measured values of the slip in starting is good.
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