IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 111 , Issue 9
Showing 1-18 articles out of 18 articles from the selected issue
  • Yoichi Ito
    1991 Volume 111 Issue 9 Pages 709-710
    Published: September 20, 1991
    Released: December 19, 2008
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  • Kisuke Yamazaki
    1991 Volume 111 Issue 9 Pages 711-714
    Published: September 20, 1991
    Released: December 19, 2008
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  • Keiichi Mori
    1991 Volume 111 Issue 9 Pages 715-717
    Published: September 20, 1991
    Released: December 19, 2008
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  • Ryuho Narita
    1991 Volume 111 Issue 9 Pages 718-720
    Published: September 20, 1991
    Released: December 19, 2008
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  • Hirotsugu Misaka
    1991 Volume 111 Issue 9 Pages 721-724
    Published: September 20, 1991
    Released: December 19, 2008
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  • Yoshinori Kasashima
    1991 Volume 111 Issue 9 Pages 725-733
    Published: September 20, 1991
    Released: December 19, 2008
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    We have already announced the design method of the passive attenuator to prevent a high voltage which induced at a crane hook of a large crane used near a medium wave radio broadcasting antenna. But it is very difficult fundamentally to microminiaturize this passive attenuator.
    In this time, we developed an active attenuator that possible to miniaturize where a negative resistor or a fourterminal amplifier is included. From the result analyzing this crane equipped with an active attenuator theoretically, we show the design method of the active attenuator. In this paper, first the equivalent circuit of the crane equipped with the active attenuator as a receiving antenna is induced. And we show that the attenuated characteristics of the active attenuator by the model experiment accords with the theoretical attenuated characteristics which employ an equivalent circuit under the same condition.
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  • Hiroshi Ohsawa
    1991 Volume 111 Issue 9 Pages 734-740
    Published: September 20, 1991
    Released: December 19, 2008
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    The power losses of transistor chopper system driving a dc shunt motor are considered, and the chopper frequency to maximize the system efficiency is referred. Additionally an inductance which make the ripple factor of the motor armature current the desired value at the optimal chopper frequency is shown.
    In the chopper system, there are two types of power losses which depend on the chopper frequency. One type of loss (that is switching loss of power devices _??_≡Psw_??_) increases, while the other type (that is AC component of copper loss _??_≡PrAC_??_) decreases, as the chopper frequency increases. In this paper, the two types of losses are approximated to simple equations. When the losses depending on the chopper frequency is limited to above two types, the chopper frequency to maximize the system efficiency is provided by the next equation. (Psw=2PrAC) From this equation, a control-law of the chopper frequency and the desired inductance for chopper efficiency are obtained. The chopper frequency to maximize the system efficiency and the effect of the inductance are ascertained by experiments.
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  • Jiro Itsumi, Hirohito Funato, Yoshitaka Ikeda
    1991 Volume 111 Issue 9 Pages 741-750
    Published: September 20, 1991
    Released: December 19, 2008
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    Because of the recent development of the high-speed self-quenching types semiconducter valve devices, the PWM inverters come to have the features of low-noise, small size and light weight. This also has brought some other serious problems.
    The paper firstly describes the soft gate-drive and the two-step base-drive methods which can suppress the instantaneous short-circuit-sure current by the storage carriers of the feedback diode, which has been one of the serious phenomena of the converters with high-frequency switching scheme. Secondly we consider the power dissipation caused by the high-frequency operation, based on the estimation method derived from the measurement of the switching waveform, then it has been clarified for the power dissipation how to depend on the carrier frequency and the load power-factor. Finally various gate control sequences which have been announced so far are examined from the viewpoints of the losses, and considerations are made on the frequency criterion and the efficiency improvement.
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  • Shigeyuki Funabiki, Noriyuki Toita
    1991 Volume 111 Issue 9 Pages 751-758
    Published: September 20, 1991
    Released: December 19, 2008
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    The rectifier, that is an AC to DC converter, is desirable to have the characteristics of the fast response and the wide range of the output voltage control, and the sinusoidal source current waveform. In this paper, a step up/down output voltage PWM controlled rectifier is proposed. The features of the proposed rectifier are as follows.
    (1) The calculation of pulse width is based on the geometrical technique and the source current can be in phase with the source voltage.
    (2) The output voltage is controlled from about zero to more than the maximum value of the source voltage.
    The above-mentioned features are clarified by simulation and the steady state characteristics are discussed. Further, these results are verified in experiment using the microprocessor-based control system.
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  • Naoya Kawasaki, Hiroshi Nomura
    1991 Volume 111 Issue 9 Pages 759-767
    Published: September 20, 1991
    Released: December 19, 2008
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    It is well known that the state-space averaging models of the boost and the buck-boost converters are bilinear systems. The stability and output regulation problems of bilinear systems are so complicated that most previous works which deal with the above two types of converter in the state space are confined to the analysis of linear approximated systems (small signal models). However, any control law for small signal model does not generally guarantee the global stability, but the partial stability of the system.
    A new control law based on the bilinear large signal model is proposed for achieving output regulation of the boost and the buck-boost converters. The control law is derived from directly applying the Lyapunov stability theory to the bilinear large signal model. The acutual realization of this control law might have some difficulties, because it is given as a solution of differential equations with respect to the state and input variables. However the closed loop system with this control law is expected to possess the robust stability achieving an excellent output regulation for large changes of reference, load and source voltage from the theoretical point of view. Some desirable features of the new control law are demonstrated by the numerical simulation.
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  • Genjiro Wakui, Kazumi Kurihara, Tomotsugu Kubota
    1991 Volume 111 Issue 9 Pages 768-776
    Published: September 20, 1991
    Released: December 19, 2008
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    This paper describes a new form of the radial flux type hysteresis motor having large output, high efficiency, and high power factor. The rotor has the copper sprayed surface layer on the rotor ring, which is made of Fe-Cr-Co magnet steel and has magnetic anisotropy and slits. The new configuration has two features. First, it is designed to give a combined hysteresis and reluctancemotor action effectively, particularly at synchronous speed. Secondly, it is designed to give a combined hysteresis torque and large torque due to eddy current at asynchronous operation, particularly at starting.
    In order to analyze motor performance at synchronous and asynchronous operations, the finiteelement method is used. In this paper, magnetic hysteresis is considered by using complex permeability. An agreement between predicted and measured values of motor performance characteristics is good.
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  • Yoshifumi Mochinaga, Kohji Ajiki, Sakae Ishikawa, Tadayoshi Okada, Tak ...
    1991 Volume 111 Issue 9 Pages 777-784
    Published: September 20, 1991
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    At substations of Shinkansen, two single-phase power sources whose phase difference is 90° face each other. Thérefore, in order to change from one source to the other in step with Shinkansen car running, a changeover section about 1km in length is set off with changeover switches provided. Thus, Shinkansen car can run through this point under power.
    Recently, the air breathed breaker at the changeover switches used in Sanyo Shinkansen was replaced with a vacuum switch. When closing the vacuum switch, a high-frequency reignition oscillation occurs between the main transformer on the car and the vacuum switch. And there by it is likely that the voltage is magnified by resonance inside the transformer and insulation breaks down.
    According to our computer simulations, it is possible to suppress the high-frequency oscillation and overvoltage by installing a CR oscillation suppressor at the changeover section. We conducted a field test at Himeji substation of Sanyo Shinkansen to confirm the effect of the countermeasure. The test result was satisfactory and now the countermeasure has been practically applied.
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  • Akira Ishizaki, Yukiya Shibata, Katsuyuki Watanabe, Kazuo Saitoh
    1991 Volume 111 Issue 9 Pages 785-793
    Published: September 20, 1991
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The application of the direct drive system is increasing in the field of robot and factory automation because of controllability with high accuracy. However, it requires the motor high torque at low speed.
    Although the vernier motor, presented by C. H. Lee in 1963, could produce the reluctance torque in low speed, it involved many problems to be solved. In this paper, the authors have studied the reluctance torque of vernier motor using the finite element field analysis. As the increase of rotor slot number is effective to produce high torque, in our model there are not only winding slots but also small slots on the stator teeth surfaces and the rotor slots are provided in the periphery of the core more than the total number of stator slots by the pole number. The calculated torques have agreed very well with the experimental results.
    A prominent feature of the control scheme is to control the armature current phase based on the detected rotor slot position, so there is no problem such as pull-in or pull-out in the vernier motor of C. H. Lee. And then the instantaneous torque is controlled by the amplitude of armature current. The experimental results on both the speed control and the position control were also shown in the paper.
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  • Tetsuya Abe, Sumio Kogoshi
    1991 Volume 111 Issue 9 Pages 794-795
    Published: September 20, 1991
    Released: December 19, 2008
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  • Ryozo Itoh, Kouichi Ishizaka
    1991 Volume 111 Issue 9 Pages 796-797
    Published: September 20, 1991
    Released: December 19, 2008
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  • Hidehiko Sugimoto
    1991 Volume 111 Issue 9 Pages 798-799
    Published: September 20, 1991
    Released: December 19, 2008
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  • Hidehiko Sugimoto
    1991 Volume 111 Issue 9 Pages 800-801
    Published: September 20, 1991
    Released: December 19, 2008
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  • Hidehiko Sogimoto, Shoji Kawasaki
    1991 Volume 111 Issue 9 Pages 802-803
    Published: September 20, 1991
    Released: December 19, 2008
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