IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 118 , Issue 2
Showing 1-18 articles out of 18 articles from the selected issue
  • Tadashi Fukao, Akira Chiba
    1998 Volume 118 Issue 2 Pages 145-149
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Takashi Kosaka, Nobuyuki Matsui, Yo-ichi Taniguchi, Hideo Do-meki
    1998 Volume 118 Issue 2 Pages 150-157
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Although the reluctance motors are attractive from the standpoints of simple construction and drive electronics, the relatively high torque ripple and acoustic noise are the major drawbacks. These drawbacks make the motor application limited.
    In the paper, the torque ripple suppression of the reluctance motor under the sinusoidal current drive is examined. The analysis shows that the torque ripple is caused by the spatial harmonics of inductance. One approach is based on the compensation current generated with the spatial harmosics of inductance. Another is based on the modification of rotor tooth configuration to eliminate the spatial harmosics. According to the proposed strategies, torque ripple suppression characteristics can be evaluated at the design stage of the motor. Both approaches have been verified by experiments.
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  • Yoshiyuki Nishimura, Katsuaki Onogi, Susumu Hashizume
    1998 Volume 118 Issue 2 Pages 158-163
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A discrete event system is a dynamical system which evolves according to asynchronous, concurrent and sequential occurrence of discrete state changes. Petri nets are a promising mathematical tool for modeling and analysis of discrete event systems. Partial languages give a correct description of how Petri nets behave. In this paper, we first review partial languages and show that they are useful for analysis of Petri nets. We then propose a synthesis of condition/event nets (a subclass of Petri nets), in which the objective is to construct a net to exhibit the desired behavior specified as a partial language. We last discuss the outline of a synthesis technique.
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  • Hideyuki Okui, Hisaichi Irie
    1998 Volume 118 Issue 2 Pages 164-172
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A switching mode DC-DC converter applying the Integrated-Voltage-Control method works stably and has no steady state error. The basic circuit of this converter consists of an error voltage integrator and a hysteresis comparator which drives a power transistor to on/off. The DC-DC converter circuit can be extended to a Four-Quadrant DC-DC converter circuit. This Four-Quadrant converter has four hysteresis comparators driven in parallel by an error voltage integrator, and each comparator drives a prearranged power transistor engaged with one of the four quadrants of the converter operation on the voltage-current plane.
    In this paper, we propose a new NPC (Neutral-Point-Clamped) Multi-Level Four-Quadrant DC-DC converter applying the Integrated-Voltage-Control method, developed from the Four-Quadrant DC-DC converter driving circuit. This new NPC converter consists of eight hysteresis comparators driven in parallel by an error voltage integrator. There are eight operating regions in this new converter and one of eight power transistors is driven by one of eight hysteresis comparators to on/off in each prearranged region. The neutral-point voltage can be kept at a constant value by a new restrain control scheme also proposed in this paper.
    It has been confirmed experimentally that the new NPC converter has no short circuit mode, no steady state error, and a quick response time.
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  • Isao Takahashi, Itaru Ando, Youichi Ito, Kenji Amei
    1998 Volume 118 Issue 2 Pages 173-178
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A long life three phase flywheel (FW) uninterruptible power supply (UPS) using an electrolytic capacitor-less converter/inverter and a transformer-less isolating system rating of 200V and 5kW-lmin is described. The UPS has following characteristics.
    (1) Electrolytic capacitor-less converter/inverter configuration which makes long life and small size.
    (2) Transformer-less isolating system to realize small size and right weight.
    (3) Battery less system for maintenance free and long life about 20 years.
    The electrolytic capacitor-less converter/inverter has a small film capacitor value of 1/50 times of a conventional ones. The converter/inverter is controlled by a current and voltage follow-up method using PWM control.
    Charging and discharging abilities of the FW energy is achieved only by controlling the instantaneous slip frequency of the induction machine.
    The UPS has excellence test results which are obtained such as input power factor of 99.8%, small output voltage distortion of 1.03% and 93.8% efficiency at full load.
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  • Bin Kaku, Ichirou Miyashita, Satoru Sone
    1998 Volume 118 Issue 2 Pages 179-185
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    To solve the acoustic magentic noise problem, the carrier frequency sinusoidal modulation PWM method has been proposed. But, there are some unresolved problems, such as how to determine the amplitude and frequency of the sinusoidal function which is used to modulate the carrier frequency, and within a certain carrier frequency range, how to select the PWM method to get the lowest acoustic magnetic noise.
    In this paper, first, the harmonics analysis for the carrier frequency sinusoidal modulation PWM is presented. Next, the relation among the harmonics spread effect, the amplitude and frequency of the sinusoidal function is discussed. The optimum values (amplitude and frequency) are determined based on the calculation of the author defined HSF (harmonics spread factor). And then, based on the author proposed induction motor acoustic magnetic noise vs. harmonic current characteristic function (NHCC function), the applicable carrier frequency ranges of the two kinds of low acoustic magnetic noise PWM methods are clarified. Finally, the experimental results are shown to verify the effectiveness of the proposed PWM method for reducing the peak values of harmonics. The low acoustic magnetic noise effect obtained by the proposed PWM method is also evaluated by the actual measurement and psychological test.
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  • Nobuyuki Kasa, Hiroshi Watanabe
    1998 Volume 118 Issue 2 Pages 186-192
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    For sensorless controlled salient-pole brushless DC motor drives, a new AC current injection method which estimates the position angle with d and q inductances was proposed. However, the estimated position angles include the errors which are casued by an unsymmetrical construction based on the mechanical or magnetic tolerance on the motor. It is difficult to correct the errors with hardwares like filters.
    An error correcting technique of an estimated position angle and rotating speed is proposed. The errors which are casued by the unsymmetrical construction appear as a modeling error of the motor periodically. Then, a neuro-like fuzzy technique can be applied to correct the error of the estimated position angle. When the motor is controlled at a commanded speed, the speed of the motor contains unexpected cyclic speed errors. The fuzzy model which estimates these errors is learned with a back propagation method which uses the cyclic errors as a teacher signal. Then, the system corrects the estimated position angles with the estimated errors. From the experimental results, the proposed sensorless control system could estimate more accurate position angle than conventional systems could.
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  • Masaaki Harada, Hai-Jiao Guo, Keisuke Abe, Kazuo Nakao, Kenichi Abe
    1998 Volume 118 Issue 2 Pages 193-200
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, we propose a new scheduling and operating method for railway systems based on pas-sengers flowing model. The method is constructed by two level, a higher level named by the scheduling level and a lower level named by the operating level. In the scheduling level, several important diagram factors that include the type of train, stop stations and stop time, and a desire dial performance which include fast achievement, lower congestion will be determined by veteran operators. In the operating level, based on those important diagram factors determined from higher level, the detail train diagram is made both by train traffic simulations and passengers flowing simulations using object-oriented technique. The results obtained from the operating level will be feedback to the higher level in order to modify some key diagram factors, and then the lower level will do again, this interactive process will be continued until a desire performance could be obtained
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  • Hideyuki Asada, Nabil Abd Rabou, Hiroaki Ikeda, Yoshifumi Shimodaira, ...
    1998 Volume 118 Issue 2 Pages 201-210
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper describes a compact bandwidth-compressed digital NTSC picture code transmission system in which circuit configurations are simplified and made inexpensive. The bandwidth of digital NTSC picture codes is compressed in accordance with subjective evaluation, and so the sampling rate is set at 8.13MHz (2.28×fsc) and the quantizing level at 5 bits. The frame bits for detecting the frames of picture ele-ments are generated by alternately generating 1 and 0 when the frames are specified. The proposed system is constructed using edge-emitting LED's (ELED's) and single-mode (SM) fibers for transmitting digital NTSC picture codes so as to easily distribute video signals from a video camera to video monitors. The transmitter was 80×100mm in size, 120g in weight, and 1000mw in power dissipation. The receiver was 55×120 mm in size, 100g in weight, and 800mw in power dissipation. Using the compact bandwidth-compressed digital NTSC picture code transmission system, a shot of the working pice in the laser cutting machine, as an example, was satisfactorily transmitted via SM optical fibers without noises.
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  • Yasuyuki Sugii
    1998 Volume 118 Issue 2 Pages 211-220
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The Tokyo Electric Power Company (TEPCO) has developed the “Libero” electric vehicle in cooperation with Mitsubishi Motors Corporation. “Libero” has the high performance and comfort comparable to gasoline vehicles. TEPCO carried out demonstration tests, allocating twenty eight of these to its branch offices for on-site business use in March 1993, and considerable data was collected. In this paper I analyze the results of research regarding the following items.
    Energy consumption of electric vehicles
    Effect on the natural environment
    I found the examples that electric vehicles achieved better energy consumption than gasoline vehicles, and that they impose lighter impact on the natural environment.
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  • Nobuo FUJII, Toru KIHARA
    1998 Volume 118 Issue 2 Pages 221-228
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, the authors propose an induction type surface or planar motor for smooth two-dimensional drive including rotating operation. The secondary member is composed of the flat conducting plate without directional qualities and the back-iron plate as secondary yoke. The primary member is composed of the toroidal core and the armature winding which can be supplied the current in every coil embedded in a slot. For the rotating drive, all the coils are used and the same rotating magnetic field as an ordinary rotating motor is generated. For the linear drive, a partial rotating field is generated in the direction of movement in each region separated into two groups every half of toroidal core. For the armature winding, two types of methods are used which are a ring-winding supplied current at each slot and a double-layer-winding supplied current to each coil. The two-dimensional electromagnetic analysis in Cartesian coordinate system is shown for the analysis, in which an effect of circular shape is considered as an edge effect. The thrust and normal force characteristics at standstill were confirmed practically by using test machine. It was cleared that the surface motor had high transformation rate of about 79% for thrust in spite of the circular shape.
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  • Nobuo FUJII, Toru KIHARA
    1998 Volume 118 Issue 2 Pages 229-235
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The authors have proposed the surface induction motor with a toroidal core as a primary core for twodimensional drive including rotating motion. In this paper, the characteristics of the surface motor (planar motor) with double layer armature winding at standstill are described. As the shape of primary member is circular, the rotating magnetic field can be generated in the same manner as a conventional rotating motor. For linear drive, the effective method for current supply is examined by studying current density distribution of primary winding, distribution of air gap flux density, thrust and normal force. As a result, to obtain larger thrust, it is effective that all coils are used and the flux has the magnetic pole common to both right and left windings at linear drive axis. In case of the change of drive direction, the current supply with adequate phase among right and left windings enables the variation of force for change of direction to be little. The transformation rate of thrust is shown which is the ratio of thrust to tangential force along circular core. To estimate the performance of the surface motor, it is compared with a singled-sided linear induction motor. The surface motor has larger thrust than the two linear motors with length of semicircle of the toroidal core in relatively small number of slots of primary core.
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  • Kazuaki Mino, Yasuhiro Okum, Kazuo Kuroki
    1998 Volume 118 Issue 2 Pages 236-242
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper describes a direct linked type frequency changer (hereafter called DLT-FC) proposed by the authors. The DLT-FC is a converter circuit with a new configuration for direct frequency change. The DLT-FC does not require a dc link circuit, nor bilateral switches. In addition, dc snubber circuits can be applied without the need for a regenerative circuit of snubber energy. Therefore, the DLT-FC can be designed to be compact and light weight, and has a long life.
    The authors manufactured a prototype of the DLT-FC and experimentally checked its CVCF and VVVF operation. The results indicate that the performance of the DLT-FC makes it suitable for industrial use.
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  • TAGUTI Akio
    1998 Volume 118 Issue 2 Pages 243-252
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Track circuit uses rail as a part of the circuit. The purposes of the track ciruit are 1) to detect the train, 2) to transmit signal to the train, and 3) to detect the rail break. There are two types in the track circuit. One adopts insulation joint at the end of the circuit, and the other one is jointless. The insulation joint demands a lot of effort to maintain and control. Furthermore it costs extremely, and it has an insulation material that becomes one of the weak points of the rail track. There are some methods to make a jointless track circuit, but it has several problems. The biggest one is that the border of the track circuits becomes fuzzy. The next one is the interference of plural track circuit signals. Nevertheless jointless track circuit has a big priority. First it does not demand an insulation joint and impedance bonds. Second it is very easy to divide.
    Jointless track circuits are adopted in the area of the sharp curve where impossible to install insulation joints on the Shinkansen line. Also several conventional lines and private railways adopt this system. Furthermore several European high speed train system also use jointless track circuit. In JR, short distance track circuit for level crossing control is jointless, but normal track circuit has an insulation joint, because there is a law restriction of track circuits border ambiguity. To solve the problem, the author had worked out simple jointless track circuit only with induction coils, which border characteristic is very excellent. Furthermore it does not have a strong frequency characteristic that it can be applied to any kinds of frequencies. In this paper, new type of jointless track circuit is proposed, it is theoretically analyzed, and basic experiments had succeeded that they are reported.
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  • Shingo Kitamura, Yoshiyuki Ishihara, Toshiyuki Todaka
    1998 Volume 118 Issue 2 Pages 253-259
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, we propose an analytical method for a motor with skewed magnets.
    In our proposal method, a motor is divided into the some segments, and then the sum of the induced voltage of each segments are coupled with the circuit equation, so that it becomes possible for 2-D FEM to take skewed effects into account.
    The proposed method has been applied to the analysis of DC Blushless Motor. Calculated results of induced voltage waveforms on no-load show close agreement with measured values. In addition the results of winding current waveformes and average torque vs. speed characteristics in steady state indicate good results. These results confirmed the validity of this method.
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  • Hiroyuki Ogiwara, Junichi Watanabe, Mutsuo Nakaoka
    1998 Volume 118 Issue 2 Pages 260-261
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Ryoji Mizutani, Nobuyuki Matsui
    1998 Volume 118 Issue 2 Pages 262-263
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Yasuhiko Neba, Eiji Furuyama, Jun Sakaguchi
    1998 Volume 118 Issue 2 Pages 264-265
    Published: February 01, 1998
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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