IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 112, Issue 12
Displaying 1-19 of 19 articles from this issue
  • Teruo Katayama, Yoshio Kano
    1992 Volume 112 Issue 12 Pages 1133
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
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  • Sakutaro Nonaka
    1992 Volume 112 Issue 12 Pages 1134-1140
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
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  • Toshiaki Yokoi, Minoru Matsuyama, Daiki Ebihara
    1992 Volume 112 Issue 12 Pages 1141-1148
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    The purpose of the investigation to be described is to examine the effectiveness of the design technique (called EVA method) for electromagnetic force maximization problem. EVA, an acroym for Eigen Value Analysis, is an approach to elucidate the essential characteristics of an electromagnetic apparatus. In the research on linear induction motor, it has become a common belief that there hardly exists an active way to prevent entry-end and exit-end effects. However, the EVA method has possibility to give a practical and effective solution to this problem. The pesent work reveals the improvement possibility of the thrust characteristics and braking characteristics of an acutual high-speed linear induction motor
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  • Toshimitsu Morizane, Takafumi Koseki, Eisuke Masada
    1992 Volume 112 Issue 12 Pages 1149-1156
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    It is necessary for a linear induction motor (LIM) to have large thrust force in application for the vertical movement. If it doesn't have enough thrust force, it can't lift even itself. A ratio (thrust force/weight of motor), therefore, is the most important factor for design of this motor.
    In this paper, assuming LIM to be a motor with no slot-effect and infinite length, a simple analytical model is introduced for steady state operation. Comparing with results of detailed numberical analysis, it is verified to be applicable for basic evaluation of the motor. The design of the motor for vertical movement is carried out and the ratio is maximized. The basic dimensions of a feasible motor are given for such application
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  • Takafumi Koseki, Toshimitsu Morizane, Eisuke Masada, Herbert Weh
    1992 Volume 112 Issue 12 Pages 1157-1163
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    Two-dimensional time dependent field calculation is mathematically formulated, using the “Control Volume Technique” for investigating the electromagnetic characteristics of linear induction motors (LIMs). The velocity term in the magnetic potential equation has been introduced using the identified technique. This modification was necessary in order to avoid possible mathematical instabilities during computations execution due to the presence of the velocity term in the diffusion equation. In the present analysis, end-effects were eliminated using periodical boundary conditions in the numerical solutions. It is revealed that, even with the absence of end-effects, the thrust-slip frequency characteristics are dependent on the secondary speed of the linear induction motor under investigation.
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  • Yssuo Sato, Motoiti Iga, Hajime Yamada
    1992 Volume 112 Issue 12 Pages 1164-1170
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    This paper presents a method of maintaining a slope surface by using a Single-sided Linear Induction Motor (SLIM). The points discussed are as follows:
    (1) It is clarified in principle that a slope surface of molten metal can be generated by supplying electromagnetic force of SLIM in the transverse direction to the gravity force. This technology will have great potentiality to improve the float process of flat glass production.
    (2) A mathematical model of a surface shape of molten metal controlled by SLIM is derived. It is shown that the calculated values of the surface shape of molten metal agree with the measured values within 5% error.
    (3) The experiments using a 0.3 meter-wide SLIM verify that the SLIM can maintain a slope surface of molten metal in the width of SLIM excluding the bus bar width. It is also demonstrated that SLIM can prevent an overflow of molten metal even if the level of molten metal is higher than the fence of molten metal bath.
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  • Tsuyoshi Higuchi, Sakutaro Nonaka
    1992 Volume 112 Issue 12 Pages 1171-1178
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    Both low-speed wheel-on-rail and medium-speed Maglev transport system with single-sided linear induction motor (SLIM) propulsion have been in the stage for practical application.
    This paper presents the method of optimizing the design parameters of SLIM's using nonlinear optimization method. The optimization problem is formulated by use of the design formulas taking into account the end effect, skin effect and air gap leakage, and the transformation method and the simplex method are applied to solve the problem. Seven parameters, such as the number of poles, the pole pitch and the stack height, are chosen as the independent variables. The output KW /input KVA, the maximum flux density in teeth, the temperature raise, the primary length, the stack height and the maximum thrust are selected as the constraint function. The performance characteristics are estimated using space harmonic analysis as well as the approximate equations.
    The method is applied to the SLIM design for urban transit, the maximum speed is about 70km/h. As the transformation methods, the interior point transformation and the exterior point transformation are compared from the stand points of accuracy and CPU time. The design is analyzed under the several objective functions, the primary weight, the input KVA and the cost of secondary materials.
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  • Takashi Onuki, Shinji Wakao, Youichi Kasahara
    1992 Volume 112 Issue 12 Pages 1179-1186
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    The linear induction motor (LIM) is structurally divided into the flat and the tubular-type. In this paper, we study one kind of tubular linear induction motor which has the primary configuration composed of four pieces of flat-type core. We call this type of motor “the square tubular LIM”. The tubular LIM has such a feature that its primary winding is a kind of ring winding, so we can independently supply the primary currents in each slot and hence easily obtain the various winding schemes. Though the square tubular LIM has various merits as stated above, the number of slots is usually limited in conventional applications.
    In this paper, therefore, we investigate the exciting current scheme with a view to improving primary magneto-motive forces. Firstly we determine the exciting current scheme in unloaded system by using polyphase alternating currents. Secondly we determine another exciting current scheme in loaded system by the hybrid finite element and boundary element method, and the augmented Lagrange multiplier method.
    Finally we confirm the proposed method by experiment.
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  • Masayuki Shibata, Naoki Maki, Toshio Saitoh, Takashi Kobayashi
    1992 Volume 112 Issue 12 Pages 1187-1193
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    An experimental line of a magnetically levitated train (MAGLEV) using superconducting magnets (SCM) is now under construction in Yamanashi-Prefecture. In the MAGLEV system, levitation coils are mounted in side wall. Induced current of the levitation coils generates magnetic flux which include higher order harmonics. Those harmonics generate eddy current at the surface of the vacuum vessel of the SCM. Forces are produced by combining the eddy current and static magnetic field of the SCM. It causes evaporation of liquid helium, or SCM quench as the worst case. At present, the number of levitation coil layer is restricted to one. By removing the restriction, however, it is possible to reduce the amplitude of the harmonics of the magnetic flux. In this paper, the amounts of amplitude are studied by varing the levitation coil length, and it is found that there is an optimum length in which the amplitude becomes minimum.
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  • Takashi Hikihara, Hiromu Konishi, Yoshihisa Hirane
    1992 Volume 112 Issue 12 Pages 1194-1199
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    Many magnetically levitated systems are applied in semiconductor factories to avoid the dusts. The proposed magnetically levitated system in this paper consists of a linear induction motor (LIM) as a guide way and a vehicle. The system is a kind of attraction type levitation system by alternating current. Both the driving force and the levitation force are obtained by the magnetic force of LIM. In this paper, the levitation characteristics at three phase excitation and at equivalent slipping state are discussed experimentally. The results show that the vehicle can be levitated without any contact to the guide way. Moreover, as a prototype vehicle model, the vehicle with a storage battery and charging circuit is proposed. The battery can be charged by the transformer effect of secondary winding. As a result, it is clarified that the vehicle can be levitated stably even in the charging state. Finally the change of levitation characteristics by horizontal displacement is discussed with looking into the affect of slots.
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  • Fumio Matsumura, Masayuki Fujita, Kazuhiro Hatake
    1992 Volume 112 Issue 12 Pages 1200-1206
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    This paper is concerned with H control design of a magnetic bearing from the point of view of loop shaping. Feedback control is indispensable for a magnetic bearing, since it is essentially an unstable system. For feedback control, a mathematical model is required; however, it does not always express the exact behavior of the system. Hence the model has various uncertainties such as the errors of parameters, neglected nonlinearities, or unmodeled dynamics. The controller is needed to guarantee robustness for both stability and performance against these uncertainties on the model.
    Firstly, based on some assumptions, a linear state space model of a magnetic bearing is shown. Secondly, the experimental machine and the surroundings of its controller are introduced. The experimental machine is a 4-axis controlled horizontal shaft magnetic bearing. The controller consists of a Digital Signal Processor with fast A/D converters and D/A converters. Thirdly, the control system is designed using normalized coprime factor plant descriptions. Selecting shaping functions in this procedure called “The Loop Shaping Design Procedure (LSDP)”, we can shape the open loop transfer function and the transfer functions of the closed loop system. Finally, several experiments are carried out according to the above designed controller.
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  • Masayuki Sanada, Yoji Takeda, Sadao Ishikawa, Takao Hirasa
    1992 Volume 112 Issue 12 Pages 1207-1213
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    The linear pulse motors (LPM) operate in an open-loop control mode similarly to a rotary stepper motor, and therefore serve as an effective positioning actuator when used in conjunction with digital electronic control circuits. The linear motion without any mechanical linkage results in several advantages for precision positioning actuators. While flat LPMs are generally used in industrial applications, these LPMs result in a heavier and more complex mover support mechanism due to the high attraction force between the stator and mover. A cylindrical LPM, however, can accomplish the same object with a simple, lightweight support mechanism because the attraction force is reduced in a cylindrical structure.
    In this paper, a new cylindrical LPM with interior permanent magnet mover is proposed. And new configurations to reduce the thrust imbalance are examined. Dynamic force is also examined. It is cleared that the cylindrical LPM with interior permanent magnet mover is very effective to improve the thrust imbalance and increase dynamic thrust force.
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  • Hiroshi Yamagami, Hidemitsu Tanaka, Yoshiaki Okui, Hajime Yamada
    1992 Volume 112 Issue 12 Pages 1214-1219
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    Electromagnetic launchers are classified according their characteristics into high velocity type of more than 10km/s and low velocity type of less than 100m/s.
    This paper deals with the theoretical expression of the flying velocity of a steel ball by means of a low velocity type electromagnetic launcher using a solenoid coil. Flying velocity of 54m/s to a steel ball with mass of 0.45g could be obtained in case of the input power of 422 J. In the experiment, reducing the eddy current and the leakage flux of the solenoid coil are considered. The efficiency of the launcher is only 0.73%, because of large copper loss and braking energy of 96%.
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  • Yoshio Kano, Tsuneo Kohki, Toshiaki Watanabe
    1992 Volume 112 Issue 12 Pages 1220-1225
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    There are many linear direct driving actuators. As these don't need convert mechanism which converts rotating motion to linear motion, these type actuators would realize simple structure and fast driving. One of direct drive actuators, linear DC motor is applied to drive X-Y stage. Therefore, structure is simplified and fast and precise control of position are realized.
    The X-Y stage drived by linear DC motors is developed for a microscope. The X-Y stage is drived by two dimensions direct drive linear DC motor, is supported by piano wire spring, has built-in type position detector which is two dimension flat type linear variable differential transformer within actuator and controller which is controlled by micro processor. As a rsult, the X-Y stage that is simple and compact structure is controled within an error of 10μm in the required range from -1.2mm to 1.2mm by PID control.
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  • Satoshi Hamada, Yasumasa Ogino, Mutsuo Nakaoka
    1992 Volume 112 Issue 12 Pages 1226-1234
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    In the demand for increasing power density of switched mode power converters, resonant topologies have attracted much attention because of their low switching losses and low EMI. However, they require relatively large resonant components, and high current or high voltage ratings for semiconductor devices.
    This paper presents a new soft-switching PWM full-bridge DC-DC converter which can overcome these drawbacks by utilizing a small saturable reactor. The principle of operation and steady-state characteristics are illustrated. The role of the saturable reactor is also discussed. Moreover, the voltage and current stresses for active and passive components are presented.
    To verify the results, key experiments were implemented with a 350W, 500kHz prototype converter. It is proved that the converter achieves soft-switching in a wide load range with no substantial increase in voltage and current stresses for active and passive components.
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  • Jeong-Ho Shin, Satoshi Komada, Muneaki Ishida, Takamasa Hori
    1992 Volume 112 Issue 12 Pages 1235-1242
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    Since direct drive (DD) motors directly drive their loads without reduction gears or ball screws, high stiffness and little friction loss are expected. However, DD motors are more sensitive to the disturbance and the parameter variation than motors with reduction gears. This paper proposes a simple and high performance hybrid position/force control of robots based on disturbance compensation by using the disturbance observer in task coordinate space. The disturbance observer linealizes system of robot manipulators in task coordinate space and realizes acceleration control. To realize the strict acceleration control, the disturbance observer whose input is a position signal by simple computation, works as if it were a disturbance detector. The inverse kinematics can be simplified, because the disturbance observer in task coordinate space compensates not only the disturbance but also the error due to the simplification of the inverse kinematics. The new strategy is applied to a three-degrees-of freedom direct drive robot. The robust and simple hybrid position/force control is realized experimentally.
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  • Yoshio Kano, Mitsuhiro Shimazu, Motoyasu Hanaoka, Masatoshi Noguchi, S ...
    1992 Volume 112 Issue 12 Pages 1243-1249
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    It is tried to develop the Induction Electromotive force type Velocity Detector (IEVD) that detects directly velocity of linear moving objects. The IEVD can directly detect velocity with high resolution, without contact on an object and dosen't give any effect on the object. The IEVD detects electromotive force in proportion to velocity from the pararell electrodes on belt-shape resistor film. The IEVD is constructed with resistor film with two pararell eloctrodes, magnets and yoke moving with an object and some electric circuits. The circuit of detector is simply constituted with electric adder circuit, amplifier and low-pass filter.
    From simulation on electric circuit about resistor film, error of IEVD is low when resistivity of resistor film is high and resistivity of electrodes on resistor film is low. From experiment, it becomes clear that output of IEVD is in proportion to velocity of standard detector. For more large output voltage, some resistor films are put in layer and magnet is made wider.
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  • Shuhei Nakata, Chihiro Tsukishima, Noriyuki Mizuta
    1992 Volume 112 Issue 12 Pages 1250-1257
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    A pulse septum magnet is designed and fabricated to have a high magnetic field intensity with thin septum width. The magnetic field is 1.75 T with a septum width of 2.3 mm. The applied current waveform is one cycle sinusoidal wave and the peak current is 13, 500 A.
    In our magnet, a conductive (made of copper) septum coil holder is used to overcome the difficulties of high power septum magnet, such as the heat loss at the thin septum coil, the degradation of the field uniformity in the magnet and the leakage flux outside the magnet.
    The heat loss at the septum coil is effectively removed by tightening up the septum coil to the coil holder with thin stainless steel bands. The temperature rise of the septum coil is only 20 centigrade at normal operation.
    The degradation of the field uniformity and the leakage flux are suppressed by an eddy current, which is induced in the coil holder.
    The pulse magnetic field distribution of the septum magnet is measured by a pick-up loop and the results show that the good field region, where the field homogeneity is less than ±0.1%, is 7.5 mm which is twice as large as the septum magnet without the eddy current in the coil holder. As for a leakage flux, the field intensity is only 14 G at 10 mm outside the magnet which is also reduced to 1/10 by the eddy current in the coil holder.
    The high energy beam extraction experiments are also perfomed and the beam monitors, which are placed down stream of the beam transport line, show that the beam can be stably extracted by the septum magnet.
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  • Ryozo Itoh, Kouichi Ishizaka, Kazuhiro Tokuda
    1992 Volume 112 Issue 12 Pages 1258-1259
    Published: December 20, 1992
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
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