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Volume 120, Issue 1
Displaying 1-21 of 21 articles from this issue
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Akira Shimada2000 Volume 120 Issue 1 Pages 1-2
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSDownload PDF (1426K) -
Seiichi Shin2000 Volume 120 Issue 1 Pages 3-4
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSDownload PDF (1202K) -
Masaki Odai, Yoichi Hori2000 Volume 120 Issue 1 Pages 5-10
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSIn this paper, we propose a novel speed control method for 2-inertia system with gear backlash based on the gear torque compensator. The compensator consists of two elements: the gear torque observer and a feedback gain to be adjusted. The ideal gear torque compensation makes the characteristic from motor torque to motor speed to that of 1-inertia system. However, such a direct usage of the compensator causes harmful vibration due to the torsional shaft. To make a compromise, we introduce a feedback gain and adjust it. By combining this method with a usual PID controller, we realized superior performances in vibration suppression and disturbance rejection. Its effectiveness is shown by simulations and experiments.View full abstractDownload PDF (3003K) -
Masaki Odai, Yoichi Hori2000 Volume 120 Issue 1 Pages 11-18
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSMost controller design methods to deal with nonlinear elements are not general. For example, anti-windup controller is effective only for saturation. Fractional order control system (FOCS) is proposed as a general method to design controllers robust against nonlinear elements, which always exist in motion control system. FOCS is described by fractional integrals. Some practical design rules of FOCS are developed and applied to motor speed control systems containing saturation and gear-backlash. Simulation and experimental results show the effectiveness of FOCS based design method.View full abstractDownload PDF (1247K) -
Yasutaka Fujimoto, Tatenobu Seki, Takahiro Yakoh, Kouhei Ohnishi2000 Volume 120 Issue 1 Pages 19-28
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThis paper presents a dynamic model of informationally connected systems. The model is based on a concept of eigenvalues and eigen-connections over an extension field of GF (2). It is shown that the eigen-connections are basis which span all connection space. Then two example models, an asynchronous scheduler and a token passing protocol, is shown. In an industry field, there are many engineering systems which have dynamical transition of informational connection. The mathematical model proposed in this paper will be useful for analysis and synthesis of various informatinally connected systems.View full abstractDownload PDF (1685K) -
Naoyuki Takesue, Guoguang Zhang, Masamichi Sakaguchi, Junji Furusho, Y ...2000 Volume 120 Issue 1 Pages 29-37
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSMost industrial robots are driven through reduction gear units by servomotors. Due to the elasticity of the drive systems including these reduction gear units, the vibratory behaviors are caused. ER fluids are the substances that can change their viscosity by applying an electric field. Because the damper with an ER fluid can change the damping coefficient, the characteristics of robots are improved by using ER damper. In this paper, we develop a new actuator with a rotary-type ER damper. The two-inertia-system with the ER damper is analyzed. The experiments are carried out and the effectiveness is confirmed.View full abstractDownload PDF (1657K) -
Kenta Nakajima, Tomotaka Kimura, Yasuyuki Shirai, Tanzo Nitta2000 Volume 120 Issue 1 Pages 38-47
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSSuperconducting generators (SCGs) have many advantages as compared with conventional ones, and practical use is expected. Before practical use, it is necessary and important to have a good grasp of the electrical characteristics of SCG under short-circuit conditions. And it is desirable that, relations between characteristics and structure-parameters of generators are explicitly and simply expressed. We obtained transient characteristics of armature current and field current for SCG by use of mathematical electro-magnetic field analyses, and studied relations between characteristics and structure-parameters of machines. In this paper, the method of solution is explained for the sudden line-to-neutral short-circuits, while only the results are quoted for the line-to-line, and the doubleline-to-neutral short-circuits. Comparisons between analytical and experimental, using 20kVA SCG, results were also studied. Consequently, the parameters that dominate the amplitude of transient current were clarified. Besides that, close agreements between analytical and experimental results were obtained.View full abstractDownload PDF (2008K) -
Katsuji Shinohara, Kichiro Yamamoto, Kenichi Iimori, Tomohiro Imamura, ...2000 Volume 120 Issue 1 Pages 48-57
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThis paper presents an active filter with a compensator for unbalanced three-phase voltages of supply voltage. Main circuit is composed of a shunt active filter which is connected in parallel with the load and unbalanced voltage compensator which is connected in series with the line through a three-phase transformer, these parts are coupled with a smoothing capacitor. This paper first discusses the relation between the current control loop of the shunt active filter and total harmonic distortion (THD) of source current. The difference of the compensation characteristics for harmonic current between two current controls which have different detecting points are investigated. Then, the active filter with double current control loops is proposed and its THD have small value in comparison with the conventional active filter with only one current control loop. Finally, the validity of this active filter with the compensator for unbalanced three-phase voltages of the supply voltage is demonstrated with simulated and experimental results of the steady state.View full abstractDownload PDF (2211K) -
Michihira Fujino, Tadashi Takanishi, Hiroaki Ishikawa, Yasuo Morooka2000 Volume 120 Issue 1 Pages 58-66
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThe study of role of noises in the neural systems has recently become an interesting subject. The models in practical use for neuron excitation are simple and can not show exact response for the inputs with noises. Hodzkin and Huxley proposed an excellent mathematical model describing the dynamics of excitation of the neural cell. This model with the higher order differential equations, however, is difficult to handle in the practical use.
In this paper, the dynamics of neuron excitation for Gaussian noises were analyzed by using Hodzkin-Huxley equation in detail. From the calculated analysis the followings were proved. The probability of excitation decreased with deviation of membrane current density (σ). The frequency of limit cycle produced by excitation are constant and not related to σ. The deviations of membrane potential(V) increased with σ in the stable or non excitation regions. The probability distribution of V can be calculated by the Fokker-Planck equation.View full abstractDownload PDF (1697K) -
Masako Kaneda, Masayuki Sanada, Sigeo Morimoto, Yoji Takeda, Hiroyuki ...2000 Volume 120 Issue 1 Pages 67-72
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSA Switched Reluctance Motor has a doubly salient structure, both stator and rotor have saliency and it has an advantage in a harsh environments due to a simple and robust structure. However, it has the disadvantage that the motor is noisy because of deformation of the motor by the radial force. This paper examines the radial force for various types of SRM at a constant mmf or constant torque using the two dimensional finite element method. We propose the evaluation factor of the acoustic noise using the finite element analysis. It is cleared that the torque is produced at the oncoming pole edges and the radial force yields at the pole face. The evaluation factor of the acoustic noise in an experimental result agrees well with the calculation value. As a result, the suitable type SRM expecting low noise is 12/8 type.View full abstractDownload PDF (1572K) -
Takeo Ishikawa, Michio Matsunami2000 Volume 120 Issue 1 Pages 73-79
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSSeveral design techniques have been applied to the optimization of a wide range of electrical machines. However, most of these applications have been restricted to optimizing a part of the whole region of electrical machines. It is said that fully automatic design is to determine the topology as well as the shape of the whole region of electrical machines and to start from empty space. For this purpose, this paper proposes a method for the design of electrical machines by optimizing material distribution using Genetic Algorithm and local search method. Design region is discretized into a finite element mesh and the material of each element is set to a gene in the chromosome. The proposed method is applied to the design of a brushless DC motor. The rotor of brushless DC motor is designed to produce a large average torque.View full abstractDownload PDF (1112K) -
Tatenobu Seki, Yasutaka Fujimoto, Takahiro Yakoh, Kouhei Ohnishi2000 Volume 120 Issue 1 Pages 80-87
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThis paper describes an Expression of Dynamical System Connection in Decentralized Autonomous Control. Decentralized autonomous system has several elements which conduct autonomously and interact among them to realize the desired total motion of the system. Here, interaction of systems is considered from a view point of system connection. In the dynamical approach, it is preferable that the system connection changes according to the environmental condition and the desired motion. To describe the hierarchical structure of the dynamical system connection, this paper introduces a graph theory.View full abstractDownload PDF (1290K) -
Ikumasa Okumura, Toshikatsu Watanabe, Noboru Itoh, Ritsuo Mihira, Manf ...2000 Volume 120 Issue 1 Pages 88-95
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThis paper describes a method of software synthesis for interlocking using safe PLC (programmable logic controller). An interlocking in railway signalling is the safe control device in order to operate many trains in the station and have to satisfy a fail safe. Traditional interlocking had been composed by the safe relays. At present it has been composed by the safe micro processors which is designed with the special purpose in the world.
Otherwise, the control devices in the European general industries has used the safe PLC (programmable logic controller) which developed to accept an EN standard. We suggest the interlocking system using the safe PLC.
We presents the advantages of the software system for signal input/output interface using a ‘standard block’ and the programming method to be able to achieve the standardization of interlocking logic with the matrix data. We made prototype interlocking and tested it. Therefore, we present the advantage of our method of software synthesis.View full abstractDownload PDF (1929K) -
Keiji Kawahara, Yoshifumi Mochinaga, Chiaki Maekawa, Shigekatsu Sato2000 Volume 120 Issue 1 Pages 96-103
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSRailway structures and traction substations suffered much damage by the Large-Magnitude Hanshin-Awaji Earthquake in 1995. In electric railway substations, structures were cracked, also a number of pieces of equipment such as transformers and silicon rectifiers were damaged, insulation oil leaked, base anchorbolts were cut, and high-voltage equipment supports inclined, and insulators cracked because of crack in the ground and uneven subsidence. This report describes the survey results of damaged traction substations and explains an earthquake-proof design method for traction substation equipment.
We surveyed natural frequencies of traction substations equipment below 170kV. This survey showed that natural frequencies of equipment below 170kV were in relatively high frequency area (about 10-20Hz) than those of equipment above 170kV. As the real dominant frequency of earthquake is several Hz, these equipments rarely cause resonance due to earthquake move, and moving responses are weak also.
From the analysis of the gliding phenomena of heavy equipment, it is found that the horizontal acceleration is in the range of 0.4-0.6G. So anchorbolts should be protected from large bending moment. Definite plans are using longer anchor-sockets, stuffing gaps between equipment and base and removing anti-vibration rubber plates.View full abstractDownload PDF (4656K) -
Masaaki OHSHIMA, Fuminori NAKAMURA, Shinzo TAMAI, Yuushin YAMAMOTO, Ha ...2000 Volume 120 Issue 1 Pages 104-111
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThis paper proposes a novel single-phase UPS inverter modulated by Error-Tracking Mode PWM scheme. An ac voltage regulation scheme which matches the PWM scheme is newly developed in a theoretical way. Since Error-tracking Mode PWM is based on constantly-sampled data, the controller is suited to be digitally implemented. The equivalent circuit of the UPS inverter controlled by the schemes is derived. The output impedence is found to be composed mainly of resistance differently from general ac apparatus.
According to the newly-developed schemes, a 3kVA, 100V, 50Hz UPS inverter is experimentally fabricated in which the sample period is 10μs and the average switching frequency is 6kHz. No load, linear load and non-linear load characteristics are measured. The output voltage remains almost sinusoidal even for the rated non-linear load. The output impedences are also measured and well agreed with the intended values.View full abstractDownload PDF (2719K) -
Yoshihisa Sato, Tomoya Osaki, Shinichi Nomura, Junji Kondoh, Takataro ...2000 Volume 120 Issue 1 Pages 112-119
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSSuper conducting Magnetic Energy Storage (SMES) is very promising for the future power storage system because of fast response, low loss and high efficiency. We proposed the Force-balanced Coil (FBC) conccpt for the SMES and demons trated it by the experiment. Moreover, we studied on coil winding configuration for SMES. The results were compared with the toroidal type configuration and ordinary helical type one. It is shown that the Force-balanced Coil is superior than the others in view points of electromagnetic force and per-unit length stored energy of the superconductor. Finally, optimization of the Force-balanced Coil for SMES (FBC-SMES) has been done. The key parameters of super conductor stress, length, maximum field and stored energy were surveyed and optimized under the restriction of critical field and critical current. It is shown that the optimized FBC-SMES is obtained in case of which parameters are pitch ρ=3 and aspect ratio A=1.79View full abstractDownload PDF (3858K) -
Fumiyasu Suzuki, Yoichi Hori2000 Volume 120 Issue 1 Pages 120-125
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSWindup phenomena is usually observed in servo systems where the controller has integral term, when the control input is saturated due to the actuator's limited capacity. To avoid this problem, anti-windup (AW) controls have been proposed. However, they do not have enough AW performance due to the instability problem. In this paper, we clarify the stability condition. Most of the conventional methods are just to stop integration when the actuator is saturated. Such methods can not be applicable to higher order servo controllers, for example, those which are designed by H∞ optimum control theory. To solve this problem, we propose a novel AW control strategy based on the saturated state observer, and show its effectiveness by simulation and experiment.View full abstractDownload PDF (1489K) -
Fumio Kitahara, Keiji Kmijyo, Norio Kawagishi, Kazuo Kera, Keisuke Bek ...2000 Volume 120 Issue 1 Pages 126-135
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSPersonnel of maintenance work for railway line has to confirm status of train running and safety by communicating with station staff using telephone, during maintenance work. Since safety of maintenance work relies upon ability of human attention, it is difficult to avoid an accident caused by human errors.
We developed the interlocking algorithm between line close and train running, which is executed in the interlocking device. In the algorithm, the track circuits corresponding to area of maintenance work are reserved and any routes in conflict with the track circuits can not be set.
This Maintenance Work Management System is put into practice in Chuo-line (1997) and Yamanote, Keihin-Tohoku-line (1998).View full abstractDownload PDF (2319K) -
Ibuki HANDA, Satoru SONE2000 Volume 120 Issue 1 Pages 136-141
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSNowadays transportation capacity in urban area is insufficient and trains are heavily crowded. This paper proposes the train operation in which a part of a long train is off the platforms to increase transportation capacity without lengthening platforms and has examined the effect of such operation. Under the operation, serviceable cars for a certain passenger are limited. By taking advantage of individual guidance, however, every passenger can be led to a proper car which meets his OD (origin-destination). Ideal distribution of passengers to each car is determined by convex quadratic problem and optimal stopping position at each station is planned by hill-climbing method. It has been confirmed by the simulation for several models that the operation is highly effective to transportation capacity.View full abstractDownload PDF (1700K) -
Hiroshi Shikano, Yoichi Hori2000 Volume 120 Issue 1 Pages 142-147
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSA lot of researches on chaos have been made. However, most of them are just investigation using computer simulation, and researches on actual chaotic system is very few. It is well known that double pendulum is a representative chaotic system. This paper deals with an actual handmade double pendulum and stabilize its chaotic motion by the extended OGY method, which we propose. First, by using reconstructed attractor which is a state space to express chaotic time series, the motion of the pendulum is analyzed. Next, the proposed new control method is applied and proved that very small control input can stabilize the system. Finally, it is compared to the disturbance observer method, and shows the superiority of the proposed control method.View full abstractDownload PDF (2196K) -
Noboru Morita, Takeshi Suzuki, Tateaki Takagi, Atsuo Matsumoto2000 Volume 120 Issue 1 Pages 148-155
Published: January 01, 2000
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSHigh voltage motors have been applied to various industrial applications. Among the high voltage motors in service today, significant proportions were manufactured in the 1960s and 1970s. Machines of this generations will need to be refreshed sooner or later, due to the insulation deterioration.
As to insulation deterioration diagnosis for high voltage motors, automatic and accurate Off-Line diagnosis system, where electric diagnosis, mechanical diagnosis and visual inspections are employed with Expert System for total evaluations has been already developed and is applied to various machine treatment and renewal cases.
This time, authors have developed On-Line partial discharge monitoring system for those motors. Features of the system are, (1) Simple system configuration using single Split-Type High-Frequency CT, (2) Micro-computer aided Statistical Noise Reduction System based on Phase Synchronous Algorithm, (3) Micro computer aided automatic Likelihood valuation system, implementing expert evaluation for Partial Discharge Phenomena of the motors.
This paper describes the system configurations and features. This paper also describes Insulation diagnosis method using the system, based on more than 30 experiences by actual machines of 300kW-10000kWView full abstractDownload PDF (2635K)
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