IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 123 , Issue 11
Showing 1-18 articles out of 18 articles from the selected issue
Paper
  • Yoshikazu Ohba, Hideki Ueno, Toshihiro Koyama, Masao Kuwahara
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1245-1252
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    Recently, travel time information is very important in traffic control systems. At present, travel time information is calculated by sensor data such as traffic counter data. However, this method can not consider a change of road traffic conditions in the future. Therefore, this paper proposes a travel time prediction method considering future traffic conditions by using pattern matching. The prediction method adopts pattern matching with travel time pattern. The prediction method uses a best matching pattern to be extracted from accumulated travel-time-patterns. Furthermore, this method is improved upon for a few accumulated patterns. Moreover, to consider applying ETC, proposed system uses the toll collection system data. For confirmation of prediction accuracy, this paper verifies the prediction method by using actual data. As a result, it was confirmed that the travel time prediction value obtained from the toll collection system was the allowance level.
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  • Toshihiko Tanaka, Shigeyuki Funabiki, Masafumi Nakazato
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1253-1261
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    This paper introduces a new approach to the capacitor-commutated converters (CCCs) for HVDC systems. A small-rated three-phase voltage-source PWM converter is connected between a series commutation capacitor and thyristor converter through matching transformers. The PWM converter acts as auxiliary commutation-capacitor for the thyristor converter while the series passive capacitor acts as the main commutation capacitor. The capacitance, which is the sum of the small-rated active and series passive capacitors, is variable, so that stable commutation is obtained. In CCCs commutation failure occurs when the ac bus voltage is recovered whereas the proposed combined commutation-capacitor can achieve successful commutation for both rapidly decreasing and increasing ac bus voltages. The basic principle of the proposed active-passive capacitor commutated converter is discussed in detail. Then, constant margin-angle control with a constant firing angle of the thyristor converter is proposed using a function generator block. Digital simulation demonstrates the novelty and effectiveness of the proposed active-passive capacitor commutated converter.
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  • Akihiro Hoshino, Shin-ichi Isobe, Masayuki Morimoto, Takashi Kosaka, N ...
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1262-1268
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    A design procedure for the Applications-Specific Electric Motors (ASEM) is proposed. The proposed design procedure is relevant to the design of the permanent magnet synchronous motor which fulfills required typical operating points under the restrictions of dimensions and the power source conditions. The design procedure is composed of two stages, a rough design and an accurate design. A rough design finds a permissible area of the combination of motor constants which satisfy the given typical operating points under the given power source conditions. According to the obtained permissible area of motor constants, an accurate design achieves the detailed motor design determining the dimensions, the winding specifications and constituent materials. Among several designed motors, one with highest fitness from standpoints of high efficiency, manufacturability and cost is finally selected. The experimental studies show that the designed motor using the proposed procedure satisfies the requirements in the target application.
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  • Masanobu Yoshida, Eiji Hiraki, Mutsuo Nakaoka
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1269-1275
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    This paper presents a novel three-phase voltage source type soft-switching inverter using the main and auxiliary IGBT power module packages in order to reduce their switching power losses as well as its electromagnetic noises. A single inductor-assisted resonant AC link snubber circuit as one of some resonant snubbers to achieve the zero voltage soft-switching for the three-phase voltage source inverter (VSI) with instantaneous space voltage vector sinewave modulation strategy is originally demonstrated as compared with the other resonant AC link snubber circuit topologies. In addition to this, its operation principle and unique features are described in this paper for resistive and inductive loads. Furthermore, the practical basic operating performances of the new instananeous space vector modulated soft-switching VSI using IGBT power modules are evaluated and discussed on the basis of power conversion efficiency and electromagnetic conductive and radiative noises from an experimental point of view, as compared with those of hard-switching VSI.
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  • KyungMin Sung, Hajime Nakakoji, Kosuke Kobayashi, Yukihiko Sato
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1276-1284
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    The matrix converter is a three phase AC-to-AC direct converter without any energy storage requirement such as DC link capacitors. However, the matrix converter has some practical problems such as the necessity of the bi-directional power devices, necessity of special commutation sequence, and complexity of the control method. Thus, there are no practical systems in which the matrix converters are used. In this paper, the control strategy for matrix converters with basic configuration is investigated to realize the practical matrix converters. First of all, the necessity of the phase detector for the input voltage and the output current sensor is pointed out from the viewpoint of realization of the basic operation. With these sensors required in the basic configuration, the instantaneous control of the output current is realized. It is also pointed out that the three phase switching is effective to improve the input current waveforms. Some methods for implementation of the three phase switching are proposed. The effectiveness of the proposed control methods is confirmed by some experimental results employing a test system.
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  • Hideaki Abe, Hiroshi Sakamoto, Koosuke Harada
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1285-1294
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    This paper is related to a non-contact energy transfer system which can stabilize the load voltage with no-feedback control. A detachable transformer used in the system has a leakage inductance. Therefore load voltage decreases greatly in proportion to load current. A feedback control circuit of the non-contact energy transfer system is more complication than that of contact energy transfer system. Consequently even if without feedback control, a non-contact energy transfer system which can keep the approximate fixed load voltage is required. The authors analyze the load voltage characteristic in detail and researched the mechanism, and found a novel method which minimize the load voltage drop rate by using optimized capacitance value of two resonant circuits.
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  • Yoshiaki Taguchi, Hirofumi Akagi
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1295-1303
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    The main purpose of a load/source simulator is to imitate an actual load/source in terms of power or current. This paper proposes a novel load/source simulator based on the unified power flow controller that is one of FACTS devices. This system takes the following prominent advantage: The converter volt-ampere rating required for the proposed system is much smaller than that for a conventional system based on a BTB (Back-To-Back) converter. Experimental results obtained from a 200-V, 10-kW laboratory system confirm the viability and effectiveness of the system. This paper also discusses the control method theoretically, and analyzes a voltage fluctuation of the dc link, thus leading to system design.
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  • Teruhisa Kumano
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1304-1313
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    Power system dynamic performance is very much affected by synchronous machines model. In particular, magnetic saturation gives substantial effects and its physical interpretation is usually complicated and difficult. Therefore saturation phenomenon has been studied long in the field of electric power system and machine analysis. Recently numerical magnetic field analysis such as FEM are widely used to consider this effect, but it needs heavy computation of large dimension matrix and necessary computing time is too long for us to apply it to multi machine power system analysis. From the viewpoint of power system analysis more sophisticated and compact model is highly required. This paper proposes a new method to take into account effects of magnetic saturation in a synchronous machine with a cylindrical rotor. It gives the additional calculation which represent the effects of magnetic saturation using so called perturbation series method applied to the nonlinearity in the magnetic permiability. Using the model generator it is confirmed that the proposed method shows good accuracy even in heavily loaded condition, in which linear analysis failed.
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  • Shin-ichi Toda, Kazuaki Yuki, Takuma Henmi, Ikuo Yasuoka
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1314-1320
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    We have developed a Re-adhesion control algorithm of traction inverter without any Motor speed sensors. In this paper, we are focusing on anti-slip control performance of this system. The influence of speed estimation delay is considered and a method to improve the delay is shown. Acceleration performance of the proposed system is same level as the one of current drive systems using speed sensors.
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  • Shinsuke Nakagawa, Takashi Yamaguchi
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1321-1329
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    In magnetic disk drives, mechanical resonance modes prevent a higher bandwidth servo being used for head positioning control. To overcome this limitation and realize more precise head positioning, a strain feedback controller which is added to a conventional head-position feedback loop was developed. The controller of a strain-feedback control system was designed so that the gain and the phase delay of the sensitivity function of the strain-feedback control system were both reduced below the frequency of a primary mechanical resonance. The controller achieves gain suppression by about 10dB at a primary mechanical resonance and phase delay of about zero degrees. It was found that the head-position control system (i.e., the strain feedback plus the conventional head-position feedback loop) increases the servo bandwidth by 17% and improves the positioning accuracy by 18%. It was also confirmed that unlike conventional servo system, the new servo design does not suffer degradation of servo characteristics at high temperature.
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  • Kazushige Kakutani, Junji Furusho
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1330-1338
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    In this paper, we propose an integrated performance simulator that supports efficient research and development for a power-assisted bicycle. First, we show theoretical conditions modeled as closely as possible to real conditions. We reproduced the conditions on the equipment simulator that we developed, which can experimentally evaluate qualities of the power-assisted bicycle. In addition, we model the performance of the power-assisted bicycle with respect to the elasticity of a torque sensor, and consider the correlation between pedaling torque and the velocity of each component using the computer simulator. Considering the equivalent nature of both simulations, the experimental results support the validity of the integrated power-assisted bicycle simulator.
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  • Kazuki Iwaya, Isao Takahashi
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1339-1344
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    This paper presents a 10kW, 200kHz power amplifier using the technology of multilevel inverters. Recently, the amplifier is required to have both high power and high efficiency to replace the class A transistor amplifiers. Its amplifier is composed of two pairs of 5-level inverters with interphase reactors. Different 81 switching patterns are used to output 9-level voltage. So that it is able to give better allowance of control degree. The proposed multilevel inverter has two switching control patterns. At one switching pattern, the sequential control of the switching devices can decrease the switching frequency. At the other switching pattern, the circulating current can be limited without changing the output voltage level. The former switching pattern is activated when the circulating current within the threshold value and the latter switching pattern is activated when the circulating current is out of threshold value. By employing these two control methods, the switching frequency can be reduced by about 1/8 times and the circulating current can be limited by ±1A for 10kW system. This paper also presents the effectiveness of characteristics, THD of output waveforms and the experimental results of output waveforms.
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  • Kotaro Matsuuchi, Tadashi Fukami, Nobuyuki Naoe, Ryoichi Hanaoka, Shin ...
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1345-1350
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    This paper presents a method of predicting the steady-state performance of a new hybrid-excitation synchronous machine (HESM) theoretically. The field pole of this HESM is axially divided into two parts; one is an excitation part and the other a permanent-magnet (PM) part. A nonlinear equivalent circuit, which can include the saliency of the rotor and the magnetic saturation due to iron core, is derived. Based on this equivalent circuit, the steady-state performance of the HESM is calculated, and the results are confirmed through experiments.
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  • Hiroshi Yamashita, Pichai Jintakosonwit, Hideaki Fujita, Hirofumi Akag ...
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1351-1358
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    This paper discusses control characteristics of line-voltage regulation by a shunt active filter intended for installation on a power distribution system. Since the power circuit configuration of the active filter is the same as a static synchronous compensator (STATCOM), it is possible to regulate the line voltage by means of controlling an adequate amount of a reactive power. In this case, no harmonic voltage affects a feedback controller for the line-voltage regulation, because the active filter eliminates harmonic components from the line voltage at the installation bus. The dynamic performance is also investigated by computer simulation and experimental results. This paper proposes a new compensation scheme capable of reducing transient voltage fluctuations caused by a phase angle change in the installation bus voltage.
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  • Shinji Shinnaka
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1359-1370
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    A salient-pole permanent magnet synchronous motor (SP-PMSM) has the high potential for applications requiring energy-efficient and/or wide-speed-range operation. For SP-PMSM, the same torque can be produced by a variety of currents due to nonlinearity between torque and torque-producing current. The appropriate determination of a current command plays a key role to achieve possible energy-efficient and/or wide-speed-range operation. This paper proposes new methods for determining the optimal current command for energy-efficient and wide-speed-range operation of SP-PMSM with core-losses. Proposed methods determine the current command based on a given torque command such that total loss consisting of copper and iron losses can be minimized if the exact solution exists, the best approximate torque can be produced if no exact solution exists. The determined current command is the optimal in sense of energy-efficiency or degree of approximation and can realize wide-speed-range operation. New real-time recursive algorithms searching the optimal current solution for nonlinear simultaneous equations defining optimal current trajectories are also given with convergence verification through experiments. The proposed methods are analytical but practical, and can be applied in both control modes of speed and torque.
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  • Seiichiro Katsura, Kouhei Ohnishi
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1371-1376
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    Minimally invasive surgery (MIS) which thinks a great deal of patient’s quality of life (QOL) has attracted attention during about ten years. In this paper, it aims at development of the technology for transmitting force sensation required in medical treatment especially through surgical instruments, such as forceps. In bilateral control, it is a problem how master and slave robots realize the law of action and reaction to the environment. Mechanism of contact with environment and bilateral controller based on stiffness are shown. Master arm in contact with human and slave arm in contact with environment are given compliance, and stable contact with environment can be realized. The proposed method is applied to 3-link master-slave manipulators. As a result, transmission and reproduction of force sensation can be realized.
    The experimental results show viability of the proposed method.
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  • Toshihiko Tanaka, Yuuji Nishida, Shinji Fukuma, Shigeyuki Funabiki
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1377-1383
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    This paper proposes a novel harmonic compensator for consumer electronic equipment that act as harmonic voltage sources in single-phase circuits, using the correlation function. The distribution transformer is equipped with an additional winding on the secondary side, and a single-phase voltage-source PWM inverter is connected to the added winding, acting as a shunt active filter. The leakage inductor on the secondary side winding behaves as though connected in series to the consumer electronic equipment. The shunt active filter can thus be used to compensate harmonic currents on the source side without an inductor series-connected to the harmonic voltage source. The basic principle of the proposed compensation method is discussed in detail. Digital computer simulation is implemented to verify the validity of the proposed compensation method. Experimental results demonstrate the novelty and excellent practicability of the proposed harmonic compensator with the proposed harmonic current detection method using the correlation function.
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Letter
  • Hideki Abe, Tomoki Hamagami, Seiichi Koakutsu, Hironori Hirata
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 11 Pages 1384-1385
    Published: 2003
    Released: June 18, 2004
    JOURNALS FREE ACCESS
    In this paper, we propose an autonomous rolling method of intelligent wheel chair (IWC) using the teaching and Q-learning. In the proposed method, first, IWC learns a run path. Next, IWC corrects a position gap around the teaching point by using Q-learning. When detection of the teaching point goes wrong by the noise to motors, IWC cannot reach to the destination. The proposed method is applied to the task which runs a passage, and the simulation results show that IWC repeats a cutback and corrects a position gap. Furthermore, the simulation results show that IWC corrects a position gap more certainly by using the data learned in the environment with the noise to motors.
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