IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 112 , Issue 11
Showing 1-15 articles out of 15 articles from the selected issue
  • 1992 Volume 112 Issue 11 Pages 1019-1028
    Published: November 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Naoya Kawasaki, Hiroshi Nomura
    1992 Volume 112 Issue 11 Pages 1031-1038
    Published: November 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    It is well known that the state space averaging models of _??_uk converters are obtained as bilinear systems. Since the stability and output regulation problems of bilinear systems are complicated, most previous works which deal with the _??_uk converters in the state space are confined to the analysis of linear approximated systems (small signal model). However a control law for small signal model dose 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 _??_uk converters. The control law is derived from directly applying the Lyapunov stability theory to the bilinear large signal model. The actual realization of this control law might have some difficulties compared with the other ones proposed previously, because it is given as a solution of the differetial equations for the state and input variables. However the closed loop system is expected to possess the robust stability achieving an excellent output regulation for any changes of reference, load and source voltage.
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  • Satoshi Ogasawara, Junji Mizuno, Hirofumi Akagi
    1992 Volume 112 Issue 11 Pages 1039-1046
    Published: November 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The authors have developed an electrical cart using two direct drive motors. It has two drive wheels and one caster wheel. A driver riding on the cart gives speed and steering commands through a joystick to operate the cart. Each motor is directly mounted into the drive wheel and is fixed on the body, frame. A speed difference between the two drive motors is controlled to turn the cart. Such a steering method which is called “differential-drive method” makes a great contribution to simplification of the mechanical structure.
    First, modeling of the cart is discussed in this paper, because few researches have been done in which dynamic equations are derived theoretically. The validity of this modeling is verified by comparing experimental results with reasonably calculated ones. Second, the authors propose a control system with fuzzy theory to get stable straight runnig performance, which can keep the caster wheel stragiht as long as a driver wants the cart to run straight. This fuzzy control system produces such a control signal that the cart automatically runs straight even if anything which may disturb the straight running occurs. It is verified experimentally that the proposed fuzzy control system helps a driver to keep the cart in a straight course.
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  • Geng Yang, Tung-Hai Chin
    1992 Volume 112 Issue 11 Pages 1047-1055
    Published: November 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Vector-controlled induction motor drive without speed sensor has been widely studied. The speed estimation can be dealt with a problem of parameter estimation, based on the theory of MRAS (Model Reference Adaptive System). In such cases, the convergence and robustness of the system should be discussed. In this paper, we discuss the stability of the MRAS, which is constructed by a full-order adaptive observer of the induction motor and is used for estimating the rotor speed and identifying the stator resistance. It is verified that, under some conditions, the transfer matrix in the forward-path of MRAS is strictly positive real and the non-linear block in the feedback-path satisfies Popov's criterion. As theresult, the system is hyperstable. The influence of the set error of the rotor resistance is discussed and the design criterion for the feedback gain of the observer is given. Finally, the system is linearized for the parameter design of the speed estimator.
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  • Masayuki Terashima, Masakatu Nomura, Michitaka Hori, Jyunichi Shimomur ...
    1992 Volume 112 Issue 11 Pages 1056-1063
    Published: November 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Spatial Filters detect the components of a specific spatial frequency contained in optical pattern on object's surface, and the movement or velocity of it are estimated by measuring the frequency of the filter's output. However, the error of the conventional method increase in cases of low speed measurement, small amount of composition of a spatial filter frequency, or large change of patterns.
    We developed a novel spatial filter in which a CCD line sensor was used to detect object's pattern and DSP (TMS 32025) performed calculation of spatial filters. We also analyzed about the phenomena that measurement error increase in several conditions of the patterns on object's surface, and developed a method which compensates this error. This paper presents the system configuration, the analysis of measurement error, the compensation method, and experimental results show that this method drastically reduce the measurement error caused by object's pattern.
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  • Masahiro Kayama, Shigeo Abe, Hiroshi Takenaga, Yasuo Morooka
    1992 Volume 112 Issue 11 Pages 1064-1070
    Published: November 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Multi-layered neural networks have been widely applied to control and recognition systems. However, since there is no deterministic method to obtain an optimal number of hidden units, trial and error simulation is required to develop these systems, which is very time consuming. In this paper, a statistical algorithm based on linear regression analysis is proposed to determine the optimal number of hidden units. The optimal number defined here is the smallest one which is sufficient for the maximum generalization capability of the network. By using a trained network with enough number of hidden units, the developed method calculates the amount of linear correlation between their outputs and estimates the redundant number of hidden units corresponding to it. Finally by subtracting the redundant number from the initial one, the optimal number of hidden units can be obtained.
    The developed method is applied to two typical neural network systems, i.e. a classification system (number recognition) and a non-linear approximation system (coagulant injection operation in a water purification plant), and demonstrated to be effective to estimate the optimal number of hidden units.
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  • Nobutomo Matsunaga, Shigeyasu Kawaji
    1992 Volume 112 Issue 11 Pages 1071-1079
    Published: November 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper presents a real time obstacle avoidance algorithm with the reference generator using piecewise polynomials. The algorithm consists of three steps. At the first step, by using the future information of path, the interaction point of the pilot point and obstacles are checked. At the second step, the intermittent point data for the trajectory generator are generated not to collide with the obstacles, where the collision point is projected on an arbitrary point on the circumference at a distance from the obstacles. At the third step, using the new data a collision free path is generated by the reference generator using piecewise polynomials. Some results of computer simulation are shown to evaluate the effectiveness of the proposed method.
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  • Masayuki Sanada, Yoji Takeda, Sadao Ishikawa, Takao Hirasa
    1992 Volume 112 Issue 11 Pages 1080-1086
    Published: November 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A linear pulse motor (LPM) has many advantages for high accuracy positioning actuator, because it has linear motion without any mechanical link. The flat type LPM is generally used in many industrial applications. It has, however, a disadvantage that the mover support mechanism becomes complex and heavy, because the attraction force between the stator and the mover is very large. As the attraction force is balanced in the cylindrical structure, the cylindrical LPM is allowed to have the simple and light weight support mechanism.
    The inset magnet type cylindrical LPM, which has a permanent magnet between A-phase and B-phase stator, has merits as a simple shape of magnet and a reduction of the motor diameter. It has a weak point that thrust unbalance occurs because the magnetic flux pass of the outer poles is longer than that of the inner poles. The thrust unbalance decreases the pull-in thrust force and increases the positioning error.
    In this paper, two practical methods are proposed to improve the thrust unbalance. The one is the exciting current adjustment and the other is the method with compensation permanent magnet. These effects are examined with theoretical and experimental results.
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  • Ken-ichi Uruga, Minoru Nagata, Korefumi Tashiro, Tomio Tadokoro, Hiros ...
    1992 Volume 112 Issue 11 Pages 1087-1096
    Published: November 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Control commands that drive railcars and operate each equipments are issued via control electric wires to each car formed train. Recently as control system come to the imcreasingly complex and service to the passengers is improved, the number of control electric wires is on the increase. But the increase is limited by easiness of maintenance and the carbody structure. Application of a multiplex system is thus conceived. Because of high level noise occurring in train, the multiplex system needs in most cases exclusive communications lines. If the control electric wires can serve concurrently as communications lines, i will be needless to install new commuication lines. By adoption of a differential driver-receiver used electric characteristic balance of control electric wires and a strong software check function of communication signal, an ample noise margin can be improved. A multiplex system was mounted on the JR electric railcars and tested on main line of JR Kyusyu. Based on the test result, the system has been inproduced in electric-diesel railcar cooperative drive system.
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  • Naoki Maki
    1992 Volume 112 Issue 11 Pages 1097-1106
    Published: November 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A superconducting generator (SCG) consists of a non-magnetic cryogenic rotor, which contains a superconducting field winding cooled by liquid helium, and an airgap armature winding, which makes it possible to get a high magnetic field in the airgap. Since the SCG construction differs from that of the conventional generator, practical application requires that its electrical and mechanical design methods be established.
    This paper describes electrical characteristics equations of the SCG, electromagnetic shield characteristics of double dampers and proof test results of a 50 MVA experimental SCG. Equations for the generator parameters (voltages, output capacity, reactances, time constants, flux densities), which are useful for practical design of the SCG, are derived from two dimensional electromagnetic analysis considering winding thickness and the edge effect. From comparison with measured and calculated values of no-load, sudden 1-3 phase short-circuit and slip extended tests, these equations were confirmed as valid.
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  • Hideo Oka, Hiroshi Yamada, Tamiya Fujiwara
    1992 Volume 112 Issue 11 Pages 1107-1114
    Published: November 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, the relationship between material and the flux control characteristic of a ferrite orthogonal core (FOC) as a measurement and control element, is presented.
    Five types of materials are examined to know the difference between their flux control characteristics. Results show that the material which has higher amount of saturation flux density can make its flux control amount bigger.
    It is clear that the higher rectangular factor material has the larger amount of flux control. Furthermore, the material which has low loss but high saturation flux density shows good linear flux control characteristic. FOC which has good rectangular factor and high flux sensitibity is useful for measurement control element, especially for the on-off activity.
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  • Fukuo Shibata, Shinichi Koike, Nobuyuki Naoe
    1992 Volume 112 Issue 11 Pages 1115-1116
    Published: November 20, 1992
    Released: December 19, 2008
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  • Satoru Onodera, Kiyohito Yamasawa
    1992 Volume 112 Issue 11 Pages 1117-1118
    Published: November 20, 1992
    Released: December 19, 2008
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  • Takumi Maruoka, Koichiro Sawa
    1992 Volume 112 Issue 11 Pages 1119-1120
    Published: November 20, 1992
    Released: December 19, 2008
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  • Hiroshi Yamada
    1992 Volume 112 Issue 11 Pages 1121-1122
    Published: November 20, 1992
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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