IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 117 , Issue 7
Showing 1-18 articles out of 18 articles from the selected issue
  • Takeji Toyoda
    1997 Volume 117 Issue 7 Pages 792-797
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Moriyuki Nakashima, Yoshinaga Maruyama, Nobuhiro Umeda, Nobuhiro Kyura ...
    1997 Volume 117 Issue 7 Pages 798-807
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The past studies on hot-line robot systems have focused on the execution of various hot-line works such as the cutout/connection of electric wires and replacement of insulators. Robot base vibration control methods, however, have seldom been discussed(1)_??_(5). The high-speed operation of the hot-line work robot system, Phase II in tasks is being worked on with the goal of practical utilization in the near future. Speed increases in boom and manipulator movements are a key part of this. The Phase II system's boom has a natural frequency of 1.0Hz in commonly used angles. If the boom or the manipulator is rapidly accelerated, the robot base vibrates violently, hampering task execution.
    This paper proposes a vibration control method, in which control gain and position command acceleration/ deceleration time are optimized for the movement of the robot base. In conjunction with the vibration control, the paper also focuses on the optimization for positioning accuracy and preventing overshoot of the manipulator. These three issues are simultaneously solved with use of genetic algorithm (GA). The proposed method has been determined for use in a preliminary experiment for the Phase II system development. A simplified test-bed manipulator of the two-axis horizontal scalar type was employed for simulation and experimentation in order to reduce modeling error. The initial effects brough about by the proposed method are verified.
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  • Kenji Kataoka, Kiyotoshi Komaya
    1997 Volume 117 Issue 7 Pages 808-814
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Since a crew operation scheduling problem is a large-scale combinatorial problem, only human experts can make schedule with trial and error in a long time by hand. Some mathematical approaches have been proposed to find optimum solution with expending huge time, but no effective approach has been presented to find constraint satisfaction solution in a short time for real world problems. We propose a new method for crew operation scheduling using simulated evolution. This method enables (1) making a crew operation scheduling by non-experts, (2) high-speed search of a feasible solution, (3) interactiveness for system and a user, (4) evaluate resource management. Users can make a high quality schedule for crew operations and take decision supports for resource management. This method can find feasible solutions in several minutes for middle scale real world problems that needs several days by human experts.
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  • Atsuya Fujino, Toshimitsu Tobita, Kumiko Nakagawa
    1997 Volume 117 Issue 7 Pages 815-822
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    With a view point of space factor in large-scale buildings, this paper first overviews several mass transportation systems and compares their characteristics. Then a loop-type independent-driven multiple-cage elevator system and its high-efficient control method are proposed, The multiple-cage elevator system can reduce its shaft space as half as that of normal elevator system. Computer simulations show the proposed control method can improve waiting time and round trip time, and restrain needless stops. The loop-type multiple-cage elevator system may be feasible for the third transportation system which fills the gap between elevators and escalators in the near future.
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  • Yi-feng Chen, Kiyoshi Fujikawa, Hirokazu Kobayashi, Kouhei Ohnishi, A. ...
    1997 Volume 117 Issue 7 Pages 823-830
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, a novel instantaneous control strategy for the AC control loop of voltage-type converter is proposed in which two switching vectors are selected sequentially in one sampling period. Vector selection is based on control error minimization theorem to bring both fast response and low ripple. Switching timing is determined in real time according to the THD (Total Harmonic Distortion) minimization theorem with instantaneous THD definition as a direct evaluation function. With this algorithm, instantaneous control can be realized in almost constant switching frequency. For DC output voltage control, voltage square feedback with load power compensated algorithm is introduced to obtain global stability with fixed gain.
    Experimental investigation confirmed the validity of proposed control algorithms.
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  • Tsuginori Inaba, Masayoshi Nagano, Masao Endo
    1997 Volume 117 Issue 7 Pages 831-838
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Hazardous wastes such as fly ash and asbestos can be melted by the plasma treatment, which become a block of glassified slag and those volume decreases sharply by 49_??_65% from the original volume. Glassified slag of the fly ash including heavy metals such as Zn, Cu, Fe and so on has an extremely good water-proof capability. The electric conductivity of the solution of 18.8g slag in 700ml distilled water is nearly as same as that of the pure distilled water, being only about 0.1% of the electric conductivity of the solution of the fly ash in the distilled water. The molten asbesto surface becomes a hard skin without needle-like fibers, which has no influence on the human health. As a result, the plasma treatment is very useful for the environmental preservation
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  • Toshimitsu Morizane, Noriyuki Kimura, Katsunori Taniguchi
    1997 Volume 117 Issue 7 Pages 839-845
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Recently, three-phase converters with high power factor, speciallily using the discontinuous current mode (DCM) are studied as novel rectified circuits instead of conventional converters. In this circuit, the current of reactor is zero at turn on because of operating on DCM. Then ZCS (Zero Current Switching) is achieved. However it is necessary to turn off the switch at the maximum current. Then the switching losses increase at higher switching frequency. Therefore, soft-switching method using the lossless snubber is proposed. In this method, ZVS (Zero Voltage Switching) at the turn off can be achieved by lossless snubber and ZCS at the turn on can be obtained by operating under the DCM.
    In this paper, the theoretical analysis, numerical analysis using PSpice, and results of the experiments show the verification of the proposed converter.
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  • Shin-ichi Motegi, Akeshi Maeda
    1997 Volume 117 Issue 7 Pages 846-855
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper describes a new single-phase buck-boost Power-Factor-Correction (PFC) converter with outputvoltage-ripple-reducing operation. The converter consists of a conventional buck-boost PFC converter and an additional switch to obtain a freewheeling mode of the dc-inductor current, and is operated by two modulators. The first modulator controls the buck-boost switch to obtain PFC. The other modulator controls square-value of the instantaneous-dc-inductor-current to perform the output-voltage-ripple-reducing operation. In the two modulations, the time-integral-value of the input and output currents in each modulation period are controlled directly and indirectly, respectively. Thus, modulation errors or undesirable distortions of the input-current and output-voltage-ripple are eliminated even if the dcinductor-current produces large ripples in a low frequency range. The theories and combination techniques for the two modulators, implementation and experimental results are described.
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  • Min Wu, Michio Nakano, Jin-Hua She
    1997 Volume 117 Issue 7 Pages 856-862
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    One important step in zinc hydrometallurgy is the purification process, which involves removing impurities such as copper, cadmium and cobalt from a zinc sulfate solution to obtain a satisfactory electrolyte. The key point in the control of the purification process is the determination of the optimal amounts of zinc dust, ethylxanthic acid sodium salt and copper sulfate that are added to the reaction tanks. This paper describes a methodology for determining the optimal amounts by using a model-based expert system technique. First, a static mathematical model is established based on the chemical reactions involved and experimental data on the process. Then, it is modified in accordance with the experience and knowledge of ‘expert’ personnel and with data on the process, and a rule model is established. Finally, the modified mathematical model and the rule model are combined into a model-based expert system that determines the optimal amounts. The results of an actual run show that a control system using the proposed methodology provides not only a high-purity product but also significant economic benefits.
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  • Hisashi Yajima, Hiroyuki Wakiwaka, Shinichi Seno, Keiichi Minegishi, N ...
    1997 Volume 117 Issue 7 Pages 863-869
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, a relation between the limit value of thrust constant and size of a linear DC motor (LDM) that is moving coil type with unipolar is described. It is deduced the relation between the limit value of the thrust constant of the LDM and the dimension of the yokes. Its relation is defined as a relational equation. To maximize the rate of thrust to the volume of LDM, the magnetic flux density in the yoke is adjusted to the value of magnetic saturation. Then, the equation consists. It means that the thrust constant is in inverse proportion to the stroke and proportional to the sectional area of the center yoke. By measurement of the thrust of the LDM and result of the magnetic field analysis (finite element method), the validity of the equation is confirmed. The equation qualitatively agrees with the measurement result, and its maximum error is 26.0 percent. Then two type LDMs are designed to verify the accuracy of the relational equation. One LDM is thin (maximum thickness is 14mm) with long stroke (100mm) for pen recorder. Another LDM is for high response positioning system with strong thrust (20 N). The relational equation agrees well with measured thrust constants of these LDMs, its error is about 14 percent.
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  • Fumio Suzuki, Kazuo Okino, Hiroyosi Yamazaki, Yoshiro Nishimura, Hisao ...
    1997 Volume 117 Issue 7 Pages 870-875
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A highly efficient RF suppression circuit for a fluorescent lamp inverters is proposed based on charge pump and partial smoothing capacitors. The circuit consists of a pumping capacitors, a partial smoothing capacitor and a control switch. The pumping capacitor is of comparatively small capacitance and the control switch operates to ensure that the pumping capacitor charging current is proportional to the AC power supply voltage even across the interval when the AC voltage is near zero. Effective use of current charging reduces the RF harmonic components in the supply current and improve the power factor. The charging voltage of pumping capacitor (VCp) and the charging voltage of partial smoothing capacitor (VCh) are responsible for the inverter drive of the lamp circuit. When the lamp starts, the control switch provide the high voltage of VCp+VCh. After the lamp has started, VCp and VCh are switched in alternately. During the period that the partial smoothing capacitor is charging, the time constants of the choke coil at the rectifier circuit input and the partial smoothing circuit are optimized, while use of the charging voltage of the pump capacitor prevents sudden appearance of a charging current at the input. Test circuits exhibited a power factor of 97.4% (well above the 85% rating), and 3rd to 11th harmonics about half of the rated values, demonstrating the feasibility of a high-power-factor, low-RF inverter.
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  • William Ofosu-Amaah, Shigeru Tanaka, Kazutoshi Miura, Susumu Tadakuma
    1997 Volume 117 Issue 7 Pages 876-883
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In single phase fed traction systems the supplied single phase AC is converted to DC, using AC/DC converters, and then to three phase AC using DC/AC PWM inverters for driving AC motors. In this conversion process, however, the DC voltage contains a ripple with a frequency equal to twice that of the single phase AC supply frequency. This fluctuation introduces disturbances in the PWM inverter output current supplied to the AC motor and causes other negative effects. In this paper, these negative effects are discussed and a new DC active filter is proposed to reduce the ripple in the DC voltage of the motor drive. The proposed filter's control is of the feed forward type. In this control, the ripple power of the smoothing capacitor voltage is calculated and used to generate a compensating current to minimize the ripple power. Simulation results for a 1, 500kVA model and experimental results for a 10kVA mini-model system which confirm the operation of the active filter will also be presented.
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  • Takashi Yano, Eiichi Muka
    1997 Volume 117 Issue 7 Pages 884-890
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper presents the theory on a hybrid type energy converter (HEC) with dual functions of induction motor and transformer. The stator core of the HEC has slots on the inside and the outside. The armature winding of the induction motor is embedded in the inside slots. On the other hand, the primary and secondary windings of the transformer are embedded in the outside slots. Moreover, a laminated ring core of iron is attached around the stator core.
    Since this HEC can perform the motor operation and/or the transformer operation, three states of operation can be realized. Based on the result of an experiment, this paper also shows that we can almost independently use the circuits for the motor and for the transformer without an interference in the HEC.
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  • Keiichi Uchimura, Takashi Saitoh, Hiro Takahashi
    1997 Volume 117 Issue 7 Pages 891-897
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, a new public transit management system called LINC (local initiative for neighborhood circulation) is introduced and the realization of its usage is investigated. LINC effectiveness and efficiency come from its utilization of three different, hierarchical and inter-dependent levels of service. LEVEL 1 involves a regional TRUNK LINE provided by the Regional Transportation Authority. LEVEL 2 is an inter-community express service provided by the Metro transit system. This service will use light rail and/or full-size buses to run between communities/stations with reliable, and frequent service. Since LINC will eliminate all existing bus stops, and since METRO buses will be stopping only at designated bus stations, we will need a new way to bring people to the station. This service is LEVEL 3, which will consist of a fleet of small, low-floored, ADA-equipped vans, each carrying 10 to 15 passengers. The vans would run on smaller neighborhood streets to pick people up and drop them off at their homes, at the station and at any other desired destination within the service area. The van service could resemble in dial-a-ride service. The dial-a-ride service is one of the optimization problems. A genetic algorithm is applied to its optimization and proper solutions are obtained as a result. The proposed approach can be very hopeful for the realization of the public transit system.
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  • Yukio Honda, Hiroshi Murakami, Narazaki Kazushige, Toshiro Higaki, Shi ...
    1997 Volume 117 Issue 7 Pages 898-904
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This report analyzes the results of experiments done with an inverter drive interior permanent magnet (IPM) motor. We examine results of both FEM (Finite Element Method) simulation and experiments using a prototype motor with identical conditions set for stator and for magnet volume. The results indicated that with magnets implanted inside the rotor, the values for the d-axis inductance of the motor remained roughly the same, unaffected by shape or number of layers. However, the q-axis inductance exhibited significant change. This research report compares an IPM motor having two layers of permanent magnets with a motor having a single layer. The dual layer shows a 30 percent or greater increase in torque using the same current. These results indicate that this motor is especially effective for such applications as robots, plant machinery, compressor motor, and electric vehicles.
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  • Toshiaki Murai, Shunsuke Fujiwara
    1997 Volume 117 Issue 7 Pages 905-911
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Eight figure coils for EDS can generate not only levitation force but also propulsion and guidance forces. Besides, on-board power is gained by utilizing a harmonic magnetic field generated by these coils. It is desirable for economic efficiency that these same coils fulfill that many functions, but it is difficult to design these coils balanced for that many functions. In addition, there are various specifications to design these coils because there should be an asymmetric figure between upper and lower coils to elevate the stability between guidance and rolling, improvement of which contributes to build up the take off velocity. On the contrary, some electrical machines are designed by adopting the optimization program. This paper describes application of the optimization program for the coil specifications in EDS maglev which combines propulsion, levitation, guidance and linear generator. Using numerical examples, the specifications for optimizing each function and combined functions are examined and the relationships between the specifications and the functions are revealed.
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  • Teruyuki Izumi
    1997 Volume 117 Issue 7 Pages 912-913
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Takayuki Nanri, Hirotaka Ito, Syuji Hayashi
    1997 Volume 117 Issue 7 Pages 914-915
    Published: June 20, 1997
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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