IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 132 , Issue 6
Showing 1-23 articles out of 23 articles from the selected issue
Paper
  • Daisuke Yashiro, Dapeng Tian, Takahiro Yakoh
    2012 Volume 132 Issue 6 Pages 600-606
    Published: June 01, 2012
    Released: June 01, 2012
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    This paper proposes an end-to-end flow controller for visual-haptic communication. A visual-haptic communication system transmits non-real-time packets, which contain large-size visual data, and real-time packets, which contain small-size haptic data. When the transmission rate of visual data exceeds the communication bandwidth, the visual-haptic communication system becomes unstable owing to buffer overflow. To solve this problem, an end-to-end flow controller is proposed. This controller determines the optimal transmission rate of visual data on the basis of the traffic conditions, which are estimated by the packets for haptic communication. Experimental results confirm that in the proposed method, a short packet-sending interval and a short delay are achieved under bandwidth change, and thus, high-precision visual-haptic communication is realized.
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  • Kazuhiro Yubai, Hiroki Fujii, Junji Hirai
    2012 Volume 132 Issue 6 Pages 607-615
    Published: June 01, 2012
    Released: June 01, 2012
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    We propose a controller tuning method that considers closed-loop stability after controller tuning without a mathematical plant model. We propose Fictitious Correlation-based Tuning (FCbT) that obtains reasonable controller parameters using a couple of input/output data. However, closed-loop stability after controller tuning is not guaranteed in this approach. In this study, we impose the stability constraint to the parameter update in order to maintain closed-loop stability at each parameter update. Moreover, by introducing particle swarm optimization (PSO) instead of the Gauss-Newton method to solve the constrained nonlinear optimization problem, the initial value dependence is considerably reduced. The effectiveness of the proposed method is confirmed by a numerical example and experimental results.
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  • Masanori Nagahara, Shingo Arai, Yutaka Uchimura
    2012 Volume 132 Issue 6 Pages 616-624
    Published: June 01, 2012
    Released: June 01, 2012
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    This paper proposes a control design that enables us to shape the frequency-dependent performance using a modified Lyapunov-Krasovskii-based stabilizing condition. A stabilizing controller can be obtained by solving the condition formulated in Linear Matrix Inequality (LMI). The designed controller is evaluated using numerical simulations, and it is employed to realize the velocity control of a DC motor. Experimental results verified that the proposed controller achieved better performance with less conservativeness and that it is applicable to real plants.
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  • Kenji Suzuki, Atsushi Ishikawa, Hideo Dohmeki
    2012 Volume 132 Issue 6 Pages 625-630
    Published: June 01, 2012
    Released: June 01, 2012
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    For short and intermediate distance conveyance using intermittent stator permanent magnet linear synchronous motor (ISPM-LSM), a linear synchronous motor with a short stator (armature) is desirable for increasing the stroke length. A PM-LSM with four poles and three teeth has previously been proposed. However, in the case of few teeth, the generated thrust at the outlet edge decreases and a ripple is produced for the generated thrust. In addition, the generated thrust is affected by the cogging force. This paper discusses the use of an interpole at the stator outlet edge and a method to decrease the thrust ripple. Moreover, a method to decrease the cogging force is also presented.
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  • Makoto Kobayashi, Kazushi Nakano
    2012 Volume 132 Issue 6 Pages 631-641
    Published: June 01, 2012
    Released: June 01, 2012
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    Ground-penetrating radar is a tool for imaging the subsurfaces with radar pulses. Since a variety of media including buried objects give different dielectric constants, the positions of the buried objects can be detected on the basis of variations in the reflected return signals. This paper presents a denoising method based on the 2D-Gabor wavelet transform method to solve the pending problems in extracting the signals reflected from buried objects. The validity of our method is demonstrated by comparing it with the f-k filtering method.
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  • Atsushi Nakata, Masahiro Nozaki, Akihiro Torii, Akiteru Ueda
    2012 Volume 132 Issue 6 Pages 642-650
    Published: June 01, 2012
    Released: June 01, 2012
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    In this paper, we propose a strategy for the design of the LCR filter in a series voltage compensator and investigate the method by performing simulations and experiments. In the proposed method, first, the inductance Lf is derived from the ratio of the maximum amplitude of the ripple current to the amplitude of the fundamental current, which is denoted as {%Irip}. Second, the capacitance Cf is derived from the ratio of the ripple voltage to the fundamental voltage. Third, the resistance R is determined from the rate of decrease of the carrier frequency component and the settling time.
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  • Takuro Kawamura, Toshiyuki Murakami
    2012 Volume 132 Issue 6 Pages 651-658
    Published: June 01, 2012
    Released: June 01, 2012
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    Recently, bicycles have gained immense popularity because they have high mobility and are an environment-friendly means of transport. However, many people tend to avoid riding a bicycle because it is unstable. In order to solve this problem, stabilization control for a bicycle has been researched. The aim of this study is improvement of the robustness in stabilization control. To achieve this goal, control systems that use a camber angle disturbance observer (CADO) are proposed. Two kinds of CADOs are proposed in this paper, and the performances of these two observers are compared. The proposed control systems provide higher robustness than does the conventional method. The validity of the proposed methods is confirmed by the experimental results.
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  • Hideaki Fujita, Makoto Hagiwara, Hirofumi Akagi
    2012 Volume 132 Issue 6 Pages 659-665
    Published: June 01, 2012
    Released: June 01, 2012
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    This paper discusses the power flow analysis and dc-capacitor voltage regulation for the modular multilevel cascaded converter (MMCC) based on double-star chopper cells (DSCC). This analysis reveals the relationship between the circulating current through the dc link and the mean power flowing out of or into each chopper cell. The dc component on the circulating current supplies a half of the active output power to the upper and lower strings of chopper cells, whereas the fundamental-frequency component transfers an amount of power between the upper and lower strings. Thus, the MMCC-DSCC can balance the capacitor voltages among the cells by controlling the amplitude of the fundamental-frequency component on the circulating current. A new control method based on the power flow analysis is employed, and its effectiveness is verified by circuit simulation.
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  • Tatsuo Maetani, Yoshinori Isomura, Akihiko Watanabe, Kenichi Iimori, S ...
    2012 Volume 132 Issue 6 Pages 666-672
    Published: June 01, 2012
    Released: June 01, 2012
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    This paper describes an ungrounded common-mode equivalent circuit for a motor driven by a voltage-source PWM inverter. When the capacitance of the rotor was is small, the reversal of the polarities of the common-mode voltage and shaft voltage is observed. In order to model this reversal, a bridge-type equivalent circuit is proposed. On the basis of calculations and experiment, it is found the values and polarity of the shaft voltage can be are accurately determined with the proposed equivalent circuit. Furthermore, the capacitance value of the insulated rotor required to make the shaft voltage equal to or less than the dielectric breakdown voltage of the bearing grease is obtained.
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  • Noboru Niguchi, Katsuhiro Hirata
    2012 Volume 132 Issue 6 Pages 673-681
    Published: June 01, 2012
    Released: June 01, 2012
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    This paper describes the cogging torque characteristics of a magnetic-geared motor with permanent magnets only on the high-speed rotor. The operational principle, which is different from that of the magnetic-geared motor with permanent magnets on the high-speed rotor and stator, is described. The torque characteristics, especially the order of the cogging torque, are mathematically formulated and verified by conducting 3-D finite element analysis and carrying out measurements on a prototype. Furthermore, a novel cogging torque reduction method is proposed and verified as well.
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