IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 110 , Issue 9
Showing 1-14 articles out of 14 articles from the selected issue
  • Yoshishige Katori
    1990 Volume 110 Issue 9 Pages 939-940
    Published: September 20, 1990
    Released: December 19, 2008
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  • Hideyoshi Tominaga
    1990 Volume 110 Issue 9 Pages 941-943
    Published: September 20, 1990
    Released: December 19, 2008
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  • Eiichi Itoigawa, Hidehisa Kitamura, Toshiyuki Hikata
    1990 Volume 110 Issue 9 Pages 944-947
    Published: September 20, 1990
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Tokuo Ohnishi, Yasunori Inoue
    1990 Volume 110 Issue 9 Pages 948-956
    Published: September 20, 1990
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, we propose a novel multi-step PWM inverter useful for the torque ripple reduction of an induction motor. The PWM waveform can be easily obtained by exchanging alternately neighbour two voltage vectors among six output voltage vectors together with a zero voltage vector every 60 degree interval.
    The basic principle and characteristics of the PWM inverter are shown at first. It is introduced that the harmonics Cn of the PWM voltage waveform approximately has the enough relation of _??_C6m-1/(6m-1)=C6m-1/(6m+1)_??_ to reduce the torque ripple of an induction motor by the cancellation of the 6m order power ripple components arising from the product of a fundamental component and 6m±1 harmonic components of the PWM waveform.
    And then, the driving characteristics of an induction motor by the proposed PWM inverter are investigated from some simulation and experimental results comparing with the conventional PAM, rectangular PWM and sinusoidal PWM inverter.
    The features of the PWM technique are high efficiency and low acoustic noise operations for the low torque ripple drive of an induction motor.
    The PWM technique may be suitable for the induction motor drive using relatively slow and large switching power devices such as GTOs.
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  • Takashi Onoki, Hiroyuki Numata, Tsugio Yamamura
    1990 Volume 110 Issue 9 Pages 957-965
    Published: September 20, 1990
    Released: December 19, 2008
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    The linear induction motor is expected to be useful for the industry, the transportation and so on, because of its simple structure and easy maintenance. The thrust control of the motor, however, usually has been an average thrust control, which is not suitable for the position control.
    In this paper, we first describe a formulation of a hybrid finite element and boundary element method. The hybrid method is a powerful analysis approach for both non-homogenous and open boundary problems.
    Using the two-dimensional hybrid method, we analyze the response of the thrust in the linear motor system by the vector control, in which the air gap flux is adopted as the input signal. In this system, we propose a novel control scheme: the supply current is controlled to have a current vector leading the flux vector by 45 degree, without any electric circuit analysis as in the usual vector control scheme.
    Lastly we find it powerful for the instantaneous thrust control to use the constant control for the advanced current angle, by both the analysis and the experiment.
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  • Hisao Matsumoto, Hiroshi Takami
    1990 Volume 110 Issue 9 Pages 966-974
    Published: September 20, 1990
    Released: December 19, 2008
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    In this work, we successfully applied a six-phase voltage source PWM inverter to a double threephase wound AC motor to attain both an increase in the capacity of the PWM inverter and a reduction in higher harmonics of the phase voltages of the motor. The system uses a coupling reactor, which has the same configuration as that of a three-phase transformer, inserted between the inverter and the motor by means of special windings. This eliminates the need for control to balance output currents from a pair of three-phase inverters. If six-phase voltages are controlled so that there exists no even-number harmonics in the same wave pattern, the coupling reactor concerned absorbs odd-number harmonic voltages other than the orders of 12p±1 (p=1, 2, 3, …). Hence the elimination of these harmonics from the phase voltages of the motor is achieved.
    It was possible to eliminate the higher harmonics of the phase voltages of the motor most effectively by applying the optimal pulse patterns obtained through the modern theory of control using Lagrange multipliers, resulting in the motor phase voltage patterns being substantially improved.
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  • Toshiyuki Miyanaga, Yukio Nakano
    1990 Volume 110 Issue 9 Pages 975-982
    Published: September 20, 1990
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In order to make more effective use of infrared radiation, we have developed a basic method for predicting the heating effect quantitatively.
    It allows one dimensional heat transfer analysis taking account of spectral properties. We can estimate the distribution and temporal variations of temperature inside the plastic plates to be heated. This method is applicable to heating systems without vaporization and enables us to predict what kind of emitter is most suitable to the platsic plate to be heated.
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  • Masahiko Akamatsu
    1990 Volume 110 Issue 9 Pages 983-989
    Published: September 20, 1990
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    On the slip control type vector control of induction motors, an axis-deviation between the secondary flux-axis and the axis of control coordinates is existence. Particularly, in case of a control scheme based on the motor model in the secondary field coordinates, this model was poor at analysis of the effect of parameter deviation and at making sure its allowable limit.
    Therefore, in this paper, transient responses considering the axis deviation are clarified. And, in order to study uniformly the vector controlled induction motors with parameter deviation and non-vector-controlled induction motors, transient characteristics including trajectory, axisdeviation angle and step response of output torque are clarified by using the motor model in the electrical synchronously rotating reference frame with γ-δ axes. Conseqently, the following arguments are studied.
    (1) The secondary field coordinates is not available for studying uniformly both of to obtain a control scheme and to evaluate the effect of parameter deviation in its control scheme, because of the motor model in this secondary field coordinates takes no account of the secondary flux of quadrature axis (qφ).
    (2) By the general solutions including cases of multiple input and of non-vector-controlled mode in the γ-δ axis coordinates, the account of parameter deviation of slip velocity control system can be taken, and the evaluation items including trajectory and axis-deviation angle etc. can be clearized.
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  • Hideki Hashimoto, Hiroshi Kuroyanagi, Fumio Harashima
    1990 Volume 110 Issue 9 Pages 990-996
    Published: September 20, 1990
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Generalized predictive control (GPC) developed by Clarke et al. is a powerful control method. It is known that GPC has a strong robustness to the parameter mismatch, model order, dead time, etc. In this paper, the authors implement this method to a servo system using DSP (Digital Signal Processor). The predictor used here predicts the future trajectory points. The control input is then determined by minimizing the norm of future errors (i.e. the differences between future trajectory points and reference trajectory points) over a future control horizon. The algorithm is easy to be implemented in a computer, especially in a DSP system. In the experiments, DSP is used to calculate the voltage to be applied to the servo motor. The experimental results show that accurate trajectory following is possible in spite of the simplification imposed to the predictor model and ignorance of the payload.
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  • Toshihiko Sugiura, Shirabe Akita, Tadashi Kawamoto, Toshiyuki Takagi, ...
    1990 Volume 110 Issue 9 Pages 997-1004
    Published: September 20, 1990
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A superconducting generator is now under intensive study as one application of superconductivity, since it has some advantages over a conventional generator. It has conductive dampers for damping vibration and for shielding field change in time. This shielding effect prevents AC joule loss from generating in the superconductors. Quantitative evaluation of the effects requires 3-D analysis of eddy currents induced in the damper.
    Among various methods of 3-D eddy current analysis, current vector potential method (T-method) would be efficient in terms of numerical calculation, especially when thin plate approximation holds. In this study a 3-D eddy current code based on this method has been developed and applied to eddy current analysis of the damper in a superconduting generator. Obtained results have some difference compared with results from 2-D analysis and show influences of the damper edges. Especially, decrease in shielding effect near the edge would be important for the damper design. This method of 3-D eddy current analysis would be useful for magnetomechanical design of thin conductive structures.
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  • Fukuo Shibata, Nobuyuki Naoe
    1990 Volume 110 Issue 9 Pages 1005-1011
    Published: September 20, 1990
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    It is desired from viewpoints of maintenances and constructions to make single-phase synchronous generators brushless and self-excited type.
    A novel brushless and self-excited single-phase synchronous generator was devised by one of the authors. The stator exciting current is made to flow simultaneously with the load current in the armature winding. Thus, the iron core for the magnetic circuit can be both as one for the synchronous generator itself and as one for the exciter.
    Experimental studies of the brushless and self-excited single-phase synchronous generator of which the rotor winding is used both as a rotor exciting winding and a field winding are described in this paper.
    In the proposed generator, the rotor is provided with a balanced two-phase field winding, in order to improve the voltage wave distortion. The terminal voltage of this generator can be kept constant, in spite of the load variation.
    Therefore, the proposed synchronous generator can be expected to be used widely.
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  • Eijiro Miyazawa, Hiroshi Muramoto, Kunihiro Shinya, Koichi Saito
    1990 Volume 110 Issue 9 Pages 1012-1013
    Published: September 20, 1990
    Released: December 19, 2008
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  • Lu Ding, Mutsuo Nakaoka
    1990 Volume 110 Issue 9 Pages 1014-1015
    Published: September 20, 1990
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • 1990 Volume 110 Issue 9 Pages 1024
    Published: 1990
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Download PDF (78K)
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