IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 114 , Issue 12
Showing 1-19 articles out of 19 articles from the selected issue
  • Fumio Matsumura
    1994 Volume 114 Issue 12 Pages 1200-1207
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Hiromasa Fukuyama, Masato Murakami
    1994 Volume 114 Issue 12 Pages 1208-1210
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Takaharu Takeshita, Takahiro Kobayashi, Nobuyuki Matsui
    1994 Volume 114 Issue 12 Pages 1211-1219
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Many researches on the three-phase PWM ac/dc converter having a unity effective power factor have been presented. This paper presents a scheme of a power source voltage sensorless three-phase PWM ac/dc converter to reduce the size and cost of the system. The effective value and phase angle of the source voltage can be estimated from the current error between the actual and model currents. Furthermore, the feature of this estimation is that the estimation and control characteristics are hardly affected by the parameter variations. The stability of the estimation system and the design of the estimation gains are shown. The initial phase angle estimation scheme is proposed for stable starting of the system. The effectiveness of the proposed estimation algorithm was confirmed by experiments.
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  • Katsumi Inuzuka, Hiromu Matsui, Kaneo Mohri
    1994 Volume 114 Issue 12 Pages 1220-1227
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper presents a highly stable steady state torque control system with a feedback of a secondary current signal.
    The torque control system is constructed with a feedback of the secondary current (I2) signal using a quick response magnetic-field sensor constructed with an amorphous core multivibrator bridge, which can solve the secondary resistance change problem for temperature variation in the IM. Moreover, we added a state feedback to the system to improve the response speed for the unit step function of a torque order.
    The I2 sensor method has advantageous especially at a low-speed range, in which conventional method using an integrator shows control errors.
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  • Akira Ishizaki, Takeshi Tanaka, Kazuhiko Takasaki, Syoji Nishikata, At ...
    1994 Volume 114 Issue 12 Pages 1228-1234
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    It has been made clear by authors' previous paper that PM vernier motor is a promising direct drive motor. In this paper, the results of study on the optimum design focusing on increase of the torque to put it to practical use are described.
    It is shown that the torque of PM vernier motor is most influenced by the maximum value of the fundamental flux density produced by the interaction between the permanent magnets and the permeance fluctuation by slot openings and the ratio of the number of magnets mounted on the rotor to the number of pole pairs of stator windings. It is also necessary to decrease the harmonic torque produced by the rotor magnets. How to design to increase the effective torque taking these matters into consideration is described and the experimental data on the machine manufactured following such a design have shown so large torque as predicted by the calculation.
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  • Daiki Ebihara, Takashi Watanobe, Masaya Watada
    1994 Volume 114 Issue 12 Pages 1235-1241
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Surface Motor (SFM) was proposed to realize bi-directional direct drive with single body. Static thrust force obtained in the prime design, however, is not surfficient for practical application. Method of numerical analysis for designing the actuator is needed for the improvement and further optimization. Finite element analysis is commonly used for these purposes. Two-dimensional analysis is not applicable for SFM, because the planer distribution of the permanent magnet and the locus of the mover inductor both affect the thrust characteristics. Three-dimensional analysis needs much calculation time and data storage capacity, and is not suitable for iterative calculation in the optimizing process. The intermediate scheme of these analysis is consequently needed.
    This paper first describes the basic structure of SFM, and then the limitation of two-dimensional analysis. Approximated three-dimensional analysis is proposed on the basis of these studies. Three-dimensional structure of the inductor, surface distribution of the permanent magnet and the interaction between the inductors and the stator are taken into account in the approximation, and the results of the two-dimensional analysin are corrected. Thrust characteristics calculated by the method are compared with the experimental results, and the accuracy and the feasibility of the scheme are proved.
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  • Zhi-Guo Bai, Kozo IDE, Zi-Jying Yong, Teruo Tsuji
    1994 Volume 114 Issue 12 Pages 1242-1248
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper treats H control system with exact linearization for an AC motor system with CSI. The characteristic of this system considerafly changes by the disturbances and changes of parameters. At first our approach to modelling of the CSI driven induction motor is presented. Then the H controller is designed for the obtained model that is the linear approximation of the plant around an equilibrium point and the nonlinear controller is constructed with exact linearrization via nonlinear state feedback. Moreover, for comparison, we also construct a PI control system based on the clasical control theory and a H control system without exact linearization. The results of several experiments show that the H control system with exact linearization is quite robust against disturbances and changable parameters as compared with the PI control system and the H control system without exact linearization.
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  • Yukihiko Sato, Teruo Kataoka
    1994 Volume 114 Issue 12 Pages 1249-1256
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In current type PWM rectifiers which can realize unity power factor and almost sinusoidal ac input current, an LC filter is required on the ac side for the absorption of the carrier harmonics and voltage spikes due to the PWM operation. However, the LC filter may cause waveform distortion and transient oscillation of the ac input current.
    In this paper, the ac input current waveform is analyzed quantitatively. From the analysis, the amplification effect of the LC filter on the harmonic currents is clarified. An expression for the prediction of the transient oscillation is derived. It is shown by the expression that the transient oscillation can contain an unbalanced harmonic component whose frequency is equal to the resonant frequency of the LC filter regardless of the ratio of the resonant frequency to fundamental frequency of the power supply.
    From the results of these analysis, a method of selecting the resonant frequency of the LC filter to avoid the steady state harmonic distortion of the supply current is proposed. It is also clarified that conventional methods of improving ac input current waveform such as optimization of the PWM pattern or introduction of the high carrier frequency operation do not have any effect on the reduction of the transient oscillation. In contrast to this, a control strategy introducing state feedback control of the LC filter proposed by the present authors is effective on the reduction of the transient oscillation.
    The analytical results shown in this paper are confirmed by some results of computer simulation.
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  • Toshiji Kato, Keitaro Tokoro
    1994 Volume 114 Issue 12 Pages 1257-1262
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper proposes a new systematic extension of the averaging analysis. An averaged circuit model, which is derived through an averaging process on a state-space model or directly on an original circuit model, can be analyzed fast and efficiently. Furthermore, it is often necessary to consider switching ripples for overvoltage protection designs. The proposed method makes it possible to compute full transient solutions with switching ripples from the averaged solutions. The principle is very simple and efficient for linear circuits with externally controlled switches of which terminal variables are slowly varying because it is basically based on the superposition theorem of the linear circuit theory. The solutions are expressed with two components; averaged and ripple-correction terms. By expressing the latter with the former by an additional steady-state analysis for one switching cycle, one averaged analysis is enough for computing full switching or non-averaged waveforms. The proposed method is also useful to modify the averaged solutions. Buck and buck-boost converter examples are shown.
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  • Yasuya Kajiwara
    1994 Volume 114 Issue 12 Pages 1263-1268
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    At a high speed convoy system with short distance between vehicles, the effects of the fluctuation of measurement values from the resolvability and the delay of the signal after filtering have been investigated by computer simulations. The vehicle model is assumed as the system represented as a first order transfer function. The simulation is performed as follows.
    (1) A convoy system is constituted of a heading vehicle and following 5 vehicles.
    (2) Each following vehicle has a distance measurement apparatus and a relative velocity measurement apparatus.
    (3) Each following vehicle calculates the value of acceleration or deceleration using the measuring values of distance and relative velocity between the preceding vehicle.
    The interesting results are obtained as follows.
    A high speed convoy system with short distance between vehicles is enough able to be realize without the communication between the vehicles, if the fluctuation of the measuremet value of the relative velocity is under 0.1m/s. On such a control sterategy as keeping the relative velocity 0m/s, it is available to use a distance measuring apparatus with a low resolvability and a filter with high filtering constant.
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  • Masafumi Sakamoto, Akira Tozune
    1994 Volume 114 Issue 12 Pages 1269-1276
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    One of the causes of characteristic deterioration and generation of vibration in hybrid stepping motor is the harmonic component flux contained in the field flux. In this paper, a method is described for reducing harmonic components by using a rotor consisted of two sets of rotor which is commonly used in hybrid stepping motors of comparatively large output. A trial of reducing harmonic is made by using such a type of rotor whose two component rotors are arranged on a shaft to give some angular displace ment in order to get some phase shift between flux distribution of their magnets. Through the experiment on various sample motors, it was confirmed that this method is fairly effective in decreasing the harmo nic components to improve the characteistic of stepping motors both in full-step operation and microstep operation.
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  • Michitaka Ono, Yoshihiro Wachi, Mamoru Shimada, Shinichi Hamawa, Takat ...
    1994 Volume 114 Issue 12 Pages 1277-1283
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The stability of the multi-strand cables under partial current distribution among strands is discussed. The stability is influenced by current sharing process among the strands. Stability tests under controlled current distribution were carried out for some test samples which had various electric resistance among strands. Then numerical analysis of the stability was carried out with simplified electric circuit model simulating current sharing process among strands. The results of the numerical calculations had good agreement with the experimental data. For stability of the multi-strand cables, the electrical resistance among strands which is the key parameter is required to be lower than the normal resistance, corresponding to the length of heated region.
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  • Shigeo Hayashi, Yoshitake Fujita, Haruyuki Kometani, Shigekazu Sakabe
    1994 Volume 114 Issue 12 Pages 1284-1293
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A three dimensional finite element approach was developed and implemented for the whole magnetic field in a Lundell alternator. The essence of the new method is the combined use of the newly developed periodic boundary condition. This new method makes it practical to analyze magnetic fields and operating performance of a Lundell alternator which has truly three dimensional magnetic flux distributions. The results of the calculation well agreed with the measured values. The calculation makes it easy and clear to understand an armature reaction and partial magnetic saturation which have not been analyzed yet in detail.
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  • Shigeo Masukawa, Yasumasa Kubota, Shoji Iida
    1994 Volume 114 Issue 12 Pages 1294-1295
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Download PDF (737K)
  • Katsunori Taniguchi, Noriyuki Kimura
    1994 Volume 114 Issue 12 Pages 1296-1297
    Published: November 20, 1994
    Released: December 19, 2008
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  • Toshihisa Shimizu, Tsutomu Fujita, Gunji Kimura, Jun Hirose
    1994 Volume 114 Issue 12 Pages 1298-1299
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Tomonobu Senjyu, Tsuyoshi Shimabukuro, Katsumi Uezato
    1994 Volume 114 Issue 12 Pages 1300-1301
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Download PDF (788K)
  • Ei-ichiro Takase, Tohru Ushiku, Ichiro Miki
    1994 Volume 114 Issue 12 Pages 1302-1303
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Tadashi Fukami, Ryutaro Miyamoto, Toshio Miyamoto
    1994 Volume 114 Issue 12 Pages 1304-1305
    Published: November 20, 1994
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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