IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 117 , Issue 10
Showing 1-19 articles out of 19 articles from the selected issue
  • Yoshifumi Mochinaga, Tetsuo Takashige
    1997 Volume 117 Issue 10 Pages 1181-1184
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Download PDF (1332K)
  • Yoshihiko Sato
    1997 Volume 117 Issue 10 Pages 1185-1186
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Download PDF (1797K)
  • Atsushi Iga
    1997 Volume 117 Issue 10 Pages 1187-1196
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The increasing household installation of photovoltaic generation system is creating a strong demand for equipment that enables accurate measurement and evaluation of the electric output of solar module (array). In order to fabricate such equipment, it is necessary to develop an inexpensive and highly accurate solar irradiance meter as well as excellent evaluation and diagnostic software.
    I constructed a solar irradience meter on the basis of the above requirements by applying the widely accepted principle of the Practical I-V Curve Construction Method which I developed.
    The results of my study indicate that a simple, general purpose and highly accurate solar irradiance meter can be developed.
    Download PDF (1480K)
  • Sakae Yamamura
    1997 Volume 117 Issue 10 Pages 1197-1204
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The spiral vector method was applied to analysis of the synchronous machine with saliency, to derive analytical solutions of electromagnetic transients of the machine by introducing the new idea of damped inductances. Sudden three phase short circuit currents were calculated with the solutions by making use of the measured inductances and they were compared with test result. Good agreement was obtained between the analysis and the test for the first time in the long history of the synchronous machinc.
    Download PDF (1153K)
  • Mutuwo Tomita, Hideyuki Yamaguchi, Shinji Doki, Shigeru Okuma
    1997 Volume 117 Issue 10 Pages 1205-1211
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A rotor position estimation of a cylindrical brushless dc motor at a standstill has been difficult. Therefore, a torque control of a motor has been difficult at starting of the motor, and the realization of the position estimation at a standstill has been desired. This paper proposes a simple processing of a rotor that non-magnetic materials are pasted on a rotor surface. This processing generates an eddy current on non-magnetic materials and causes an opened phase voltage change according to a rotor position. The experimental results used a microcomputer show that it is possible to estimate a rotor position of the cylindrical motor despite of a standstill by using the opened phase voltage change.
    Download PDF (1309K)
  • Jun-Ho Lee, Abdelfatah M. Mohamed, Fumio Matsumura
    1997 Volume 117 Issue 10 Pages 1212-1220
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper utilizes the method of Q-parameterization control to design a controller which solves the problem of imbalance in magnetic bearing systems. There are two methods to solve this problem using feedback control. The first method is to compensate for the imbalance forces by generating opposing forces on the bearing surface (imbalance compensation). The second method is to make the rotor rotate around its axis of inertia (automatic balancing); in this case no imbalance forces will be generated. The free parameter of the Q-parameterization controller is chosen such that these goals are achieved. After the introduction of a mathematical model of the magnetic bearing system, we explain the Q-parameterization controller design of the magnetic bearing system with emphasis on the rejection of sinusoidal disturbance for imbalance compensation design and the rejection of sinusoidal sensor noise for automatic balancing design. The design objectives are formulated as a linear equations in the controller free parameter Q. Finally, simulation and experimental results are presented and showed the robustness and effectiveness of the proposed controllers.
    Download PDF (3089K)
  • Yukio Honda, Shizuka Yokote, Toshiro Higaki, Shigeo Morimoto, Yoji Tak ...
    1997 Volume 117 Issue 10 Pages 1221-1226
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper we would like to discuss the results of our investigation of the Interior Permanent Magnet Synchronous Motor (IPM), which has permanent magnets embeded in the rotor, and in particular we are concerned with the Double Layer IPM Synchronous Motor, which has two layers of magnets embeded in the rotor layered in the direction of the radius. For this investigation, we studied the arrangement of permanent magnets both through simulation and experiments with a prototype. The results concerning the form of the magnets clearly show the superiority of the reverse arc form, which can increase the surface area creating magnetic flux. We further determined that to maximize both the qaxis flux and the flux of the permanent magnets, the optimum size for the q-axis flux path between the magnets for the motor studied on this occasion is 2 mm. In addition, the results clearly show that notching the ends of magnets is effective in further utilizing the q-axis flux.
    Download PDF (1497K)
  • Sorao Kenji, Murakami Toshiyuki, Ohnishi Kouhei
    1997 Volume 117 Issue 10 Pages 1227-1233
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, a robust impedance control scheme is used to control a biped locomotion in saggital plane. In particular, the torque observer is introduced and external-force feedback is achieved without force sensor. By the reaction force feedback, the stability of the biped robot increase at the contact of the swing leg and the arbitral impedance control is realized without force sensor. The walking trajectory reference is created from the virtual inverse pendulum model. Simulation and experimental results also show that the effect of the collision between biped leg and the ground is eased and by the proposed control method, the biped robot recover more quickly than the traditional robust position control.
    Download PDF (2570K)
  • Shin-ya TAMURA, Yoshihisa HIRANE
    1997 Volume 117 Issue 10 Pages 1234-1239
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A principle of hybrid magnetic levitation system using permanent magnets (PM) and high temperature superconductors (HTSC) for a linear-motor-type carrier system in a high quality clean room and a magnetic bearing using for the flywheel energy storage system are discussed. The substantial levitation force was generated by the repulsive force between the same poles of coupled magnets. However the repulsion system with magnets is essentially unstable without any control. Then HTSC is applied for control elements of the PM-HTSC hybrid magnetic levitation system. In this system, the levitation force becomes stronger than the system without PM. And we can expect the sandwich type magnetic bearing greater force.
    Download PDF (1265K)
  • Toshie Takeuchi, Tetsuya Matsuda, Shunji Yamamoto, Shiro Nakamura, Tad ...
    1997 Volume 117 Issue 10 Pages 1240-1246
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A 180 degree superconducting bending magnet for a synchrotron radiation source has been designed and constructed based on 3-dimensional electromagnetic analysis. The magnet is covered by iron shield to prevent the leakage of magnetic fields. The liquid helium consumption of the equipment is very small in the persistent current mode. The measurement results are in good agreement with the analysed ones. This magnet is under operation as a synchrotron radiation source at a beam energy of 600MeV. The radiation can be used for several applications, such as, X-ray lithography in semiconductor industries.
    Download PDF (3029K)
  • Shinji Shinnaka
    1997 Volume 117 Issue 10 Pages 1247-1253
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper proposes new mathematical models of induction motor, which is supposed to generate precisely torque under vector control. The proposed models for controlled motor have the following proper features in perspective of preciseness and compactness. They guarantee the same relation between stator signals of voltage and current as conventional T-type model consisting of five parameters. Parameters forming new models are reduced to a set of four such as stator resistance, inverse of rotor time constant, stator inductance, and stator total leakage inductance or another set of four related uniquely with them. They can be uniquely determined by the stator signals, in terms of which all controller parameters of vector control system can be designed.
    Download PDF (1317K)
  • Tsutomu Yokozuka, Eiji Baba, Takashi Takatsuki, Atsushi Miyaki
    1997 Volume 117 Issue 10 Pages 1254-1261
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Abstract A method for calculating the harmonic input impedance ZH and harmonic losses WH of induction motors operating from PAM- and PWM inverters is presented. The method is derived by use of six test motors, of ratings from 1.5 KW to 900 KW. A simple method is given for calculating the skin effect coefficients KR and KX. The method indicates that it is necessary to consider the skin effects and the stray load losses. Effects of harmonic order, and carrier frequency on ZH and WH are discussed,
    Download PDF (1351K)
  • Hideaki Fujita, Hirofumi Akagi
    1997 Volume 117 Issue 10 Pages 1262-1268
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper presents a specially designed third-order resonant circuit intended to achieve fast switching operation for a voltage-source series-resonant inverter using four MOSFETs. The third-order resonant current superimposed on a sinusoidal load current helps to quickly charge or discharge the output capacitance of each MOSFET. This results not only in a reduction of the time required to turn the MOSFET on and off, but also in an improvement of the displacement factor of the inverter. Moreover, the third-order resonant circuit acts as a low-pass filter to eliminate the parasitic oscillation between line inductance and stray capacitance. The viability and effectiveness of the third-order resonant circuit is verified by a 2MHz, 2kW prototype inverter developed for a low-temperature plasma generator.
    Download PDF (1823K)
  • Motoichi Iga, Yasuo Sato, Hajime Yamada
    1997 Volume 117 Issue 10 Pages 1269-1275
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In one of the glass sheet tempering process in which a glass sheet is submerged into molten metal with electromagnetic force by Linear Induction Motor (LIM), it is necessary to keep the glass sheet vertical in the center of molten metal tank. Because a glass sheet warps unless its both sides are uniformly cooled.
    This paper describes an idea of buoyant force center on a glass sheet in molten metal which is introduced to discuss its stability against tilt. If the buoyant force center of a glass sheet is higher than its gravity center, it is stable against tilt. Numerical simulation of electromagnetic fluid flow is performed to evaluate the buoyant force center. Its stable conditions obtained are the followings:
    (1) The shortest length of a glass sheet is 2τ/3 shorter than that of LIMs.
    (2) The lowest limit of the gravity center of a glass sheet is τ/3 higher than the center of LIMs.
    where τ is the pole pitch of LIMs.
    Download PDF (1388K)
  • Hisaji Fukuda
    1997 Volume 117 Issue 10 Pages 1276-1285
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Railway crossing are the weakest point in the railway system. In spite of various countermeasures taken most of fatal operational accidents have occurred. Therefore high priority is given to safety countermeasures. In an approach to safety problem from information science, the author has aimed to establish a mathematical model for analyzing complexed relation between accident and factors such as locality, transportation environment, crossing structure etc., and apply the model to safety management method.
    This paper proposes a method which extracts accident factors by multivariate analysis i.e., a kind of statistical method, constructs a risk assessment model and calculates risk assessment indices, as well as simulation of equipment improvement, safety management system. It is universally available for not only general analysis of accident factors, but also risk assessment, proposal of countermeasure, and setting of priority of investigation on individual crossing. We are confident that we have established a consistent, effective safety (risk) management system. We have dealt with the crossing with relatively complete data as a recent urgent issue, but the method has generality for overall safety problem.
    Download PDF (2582K)
  • Shin-ichi Motegi, Akeshi Maeda
    1997 Volume 117 Issue 10 Pages 1286-1287
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Download PDF (1142K)
  • Kinjiro Yoshid, Katsumi Kesamaru, Yasuhiro Hita
    1997 Volume 117 Issue 10 Pages 1288-1289
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Download PDF (901K)
  • Yasuhiko Neba, Ken'ichi Seto
    1997 Volume 117 Issue 10 Pages 1290-1291
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Download PDF (996K)
  • Tadashi Fukami, Satoru Kawahara, Toshio Miyamoto
    1997 Volume 117 Issue 10 Pages 1292-1293
    Published: September 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Download PDF (943K)
feedback
Top