Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/tia.2021.3101190

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

The superconducting magnetically levitated train (JR Maglev) has been developed. Electrodynamic suspension realizes stable levitation and guidance without gap control. As the damping against the bogie vibration is small, the damper coil system has been proposed to control vibration of the bogie. Superconducting (SC) coil quenching is one of the most serious problems. Although the effect of the damper coils in the case of SC coil quenching has been confirmed, influence of the position of the quenched coils on the bogie motion is not shown. In this paper, the dependence of the quenched coil position on the bogie is studied. When the end coil of the bogie quenches, the levitation force and guidance force reach twice and five times compared with the ordinary force. In the case of inside coil quenching, the exceptional force is supported by each side of the SC coils. Thus, its influence becomes small. Even in the case of end coil quenching, damper coils control the large vibration.

DOI： 10.1109/TASC.2016.2526025

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

A hybrid magnetic bearing with a bulk high-temperature superconductor (HTS) and a permanent magnet has been developed. The pinning force of the HTS is used to generate levitation and guidance force. The attractive force instead of the repulsive force of the permanent magnets is introduced to improve the guidance force. The effect of the attractive hybrid system on the rotational motion is studied. Three-dimensional FEM analysis of the linkage flux from the permanent magnet through the HTS is undertaken. In the hybrid system, the permanent magnet of the stator increases the linkage flux of the HTS in the levitation direction. The rotor in the hybrid system is supported by the attractive force and the pinning force. Radial restoring force is increased by the attractive force and pinning force, which is caused by the increment of the linkage flux. As a result, vibration amplitude decreased and natural frequency increased.

DOI： 10.1109/TASC.2016.2531981

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

The hybrid magnetically levitated carrying system has been developed. In this system, the pinning force of the high-temperature superconductor (HTS) achieves stable levitation and guidance without control. Repulsive force caused by the permanent magnets is used to support the load weight of the carrier. The interaction between the permanent magnet and the air core copper coils (propulsion coils) generates propulsion force. To increase the propulsion force, propulsion coil pitch is changed. In a previous research study, only flux of the permanent magnet is used for propulsion. Hence, the flux of the HTS for levitation and guidance is also used for propulsion. From the experimental results, propulsion force becomes about 131% larger than that of the conventional excitation method. There is no influence on the pinning characteristics for levitation and guidance by using the pinned flux of the HTS for propulsion.

DOI： 10.1109/TASC.2016.2526033

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

Numerical analysis of the superconducting magnetically levitated bogie (JR Maglev) has been studied. In this system, electrodynamic suspension with the null-flux configuration is applied to keep the levitation and guidance position of the train without gap control. However, the damping factor of the system is little. The active damper coil is introduced to increase the damping factor. It has a large effect on reducing the vertical vibration. However, when the vertical vibration and pitching motion occur simultaneously, it does not control the vibration perfectly. The control method of the active damper coil is studied. The improved switching function (combined switching) that has an effect on the multidirectional vibration is modeled. Running simulation when the bogie passes the guideway displacement has been undertaken. The active damper that is controlled by the combined switching decreases the multidirectional vibration.

DOI： 10.1109/TASC.2016.2541609

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ELSEVIER SCIENCE BV  

We have developed the hybrid magnetic bearing using permanent magnets and high temperature bulk super conductor (HTS). In this system, the permanent magnet has ring type structure so that the permanent magnet and the HTS can be set to the stator. The pinning force of the HTS is used for the levitation and the guidance. Repulsive force of the permanent magnets was used in the conventional hybrid system. However the restoring force in the guidance direction of the conventional hybrid system decreases by the side slip force of the permanent magnets.
In this research, attractive force of permanent magnets is used for increasing the load weight in the guidance direction. In this paper, influence of the hybrid system on the static characteristics of the rotor is studied. Three-dimensional numerical analysis of the linkage flux (in the levitation and the guidance direction) in the HTS is undertaken. The stator side permanent magnet increases the linkage flux of the levitation direction. Therefore in the hybrid system the linkage flux of the levitation direction increases. The levitation and restoring force of the rotor is measured. The levitation force of the hybrid system becomes smaller than that of the non-hybrid one by attractive force. The rotor in the hybrid system is supported by the pinning force and attractive force. The restoring force of the hybrid system becomes larger than that of the non-hybrid one because of increasing the linkage flux of the levitation direction. (C) 2014 The Authors. Published by Elsevier B.V.

DOI： 10.1016/j.phpro.2014.09.052

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

We have developed the hybrid magnetic bearing using permanent magnets and the high-T-c bulk superconductor (HTSC). Pinning force of the HTSC is used for the levitation and the guidance. Repulsive force of the permanent magnets is introduced to increase the load weight of the magnetic bearing. In this system, the stator side permanent magnet has the ring type structure so that both pinning force and repulsive force are used effectively.
In this paper, influence of the hybrid system on dynamic characteristics of the rotor is studied. The rotor which is supported by the hybrid magnetic bearing is rotated. Then, vibration and the gradient angle of the rotor are measured until the rotor reaches to the end of the resonance state. Three dimensional numerical analysis of the flux which penetrates on the surface of the HTSC is undertaken. The relation between the dynamic characteristics and the flux is considered, and that of the hybrid system is compared with the non-hybrid one. In the hybrid system, the flux is changed by the influences of the stator side permanent magnet. Vibration and the gradient angle of the hybrid system are shown to be smaller than that of the non-hybrid one. (C) 2013 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physc.2013.04.035

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

Numerical simulation of the superconducting magnetically levitated bogie (JR Maglev) has been studied. The electrodynamic suspension is used for levitation and guidance. Although this suspension needs no gap control, damping factor of the system is shown to be small. Therefore the additional damping system is considered. The damper coil system is introduced to increase damping of the levitation system. Switching function of the damper coils are introduced. This semi-active damper coil system shows large effect to decrease vertical oscillation of the bogie. In this levitation system, interaction between vertical oscillation and pitching motion is large. The running simulation program which calculates rotational motion of the bogie is developed. As the control method of the semi-active damper coils system is defined corresponding to the vertical oscillation of the bogie, it does not work to decrease pitching oscillation in some case. Thus the control method that shows effects both vertical oscillation and pitching motion are considered. Using this method, the running simulation of the bogie when vertical oscillation and pitching motion occur has been undertaken. The pitching motion of the bogie converges by this control method.

DOI： 10.1109/TMAG.2012.2202378

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

Numerical simulation of the superconducting magnetically levitated bogie (JR Maglev) has been studied. The electrodynamic suspension is used for levitation and guidance. Although this suspension needs no gap control, the damping factor of the system is shown to be small. In Japan, the ground condition is not good. When the bogie passes the vertical displacement of the guideway, oscillation of the bogie occurs. And this oscillation does not converge immediately. The damper coil system is introduced to increase damping of the levitation system. Running simulation of the bogie when the bogie passes the guideway displacement is undertaken. The damper coil decreases the oscillation of the bogie. To increase the damping factor, the semi-active system is considered. This system shows large effect against oscillation of the bogie.

DOI： 10.1109/TASC.2012.2186624

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ELSEVIER SCIENCE BV  

Magnetically levitated carrying system has been developed. In this system, pinning force of high temperature bulk superconductor (HTSC) is used for the levitation and guidance. The magnetic rail is set on the ground, and flux from the magnetic rail is pinned by HTSCs. To increase levitation force, repulsive force of the permanent magnet is used. For the propulsion system, electromagnets are installed on the surface of the magnetic rail. Improvement of the propulsion force is studied. In the previous system, only flux of the permanent magnet of the carrier is used for propulsion. To increase propulsion force, that of the HTSC of the carrier is also used. Using this excitation method, the propulsion force is improved even though total number of the excited coil is the same. (C) 2012 Published by Elsevier B.V. Selection and/or peer-review under responsibility of IS S Program Committee

DOI： 10.1016/j.phpro.2012.03.504

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

The magnetically levitated conveyance system has been developed. Pinning force of high temperature bulk superconductors (HTSC) are used for the levitation and the guidance of the carrier. The magnetic rail is set on the ground, and flux from the magnetic rail is pinned by HTSCs on the carrier body. To increase the load weight, the repulsive force of the permanent magnet is introduced. The hybrid levitation system is composed. The repulsive force by the permanent magnet between the load stage on the carrier and the magnetic rail on the ground is used to support the load weight. As the load stage is connected to the carrier body by the linear sliders, the mass of the load weight does not act on the carrier body. The interaction between the electromagnet and the permanent magnet under the load stage generates the propulsion force. The electromagnet is constructed by the air core coils, and excited only when the load stage passes. The interaction between the propulsion and the levitation system is investigated. Disturbance of the propulsion system on the levitation and the guidance force is measured. The results show the influence of the propulsion electromagnet on the pinning force is little, and this propulsion system works effectively. (c) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physc.2010.05.203

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Magnetic levitation using the pinning force of the YBaCuO high-T(c) bulk superconductor (HTSC) materials has an advantage to achieve stable levitation without control. To increase levitation force, the HTSC-permanent magnet hybrid magnetic bearing system is introduced. A circular shaped three phase Nd-Fe-B permanent magnet is installed on the rotor, and HTSC bulk superconductor is set on the stator. The additional permanent magnet is installed under the HTSC. Repulsive force of the permanent magnet is used for levitation. and pinning force between the HTSC and permanent magnet is used for guidance force of the bearing. In this system, relationship between permanent magnet and the HTSC is important. When repulsive force of the permanent magnet is large, pinning force of superconductor is used to keep the rotor position. As a result, stability for the lateral direction is decreased with hybrid system. For levitation force, effect of the hybrid system is not observed with column HTSC. Compared with the ring HTSC results, the following thing is considered. Because there is no space that flux of one permanent magnet acts on the other one with the column HTSC configuration, interaction between two permanent magnets becomes small. (C) 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physc.2009.05.162

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：SCRIPTA TECHNICA-JOHN WILEY & SONS  

The three-dimensional vibration of the rotor in a permanent-HTSC magnetic bearing system is studied. We have developed a magnetic bearing system which can revolve at up to 12,000 rpm, and three-dimensional vibration of the rotor is measured with laser displacement sensors. To consider the rotor vibration in a mechanical resonance state. the static lateral and vertical pinning forces of the magnetic bearing are measureed. The results are used to obtain the resonant frequency. There are two factors in the mechanical resonance caused by the magnetic bearing. One is the lateral equivalent spring coefficient and the other is the vertical equivalent spring coefficient. The influence of mechanical resonance caused by the lateral spring coefficient is large, and that of the vertical one is small. The three-dimensional vibration of the rotor position around the mechanical resonant frequency is measured. Because the revolution of the rotor increases the lateral force to the center, the resonant frequency obtained in a Free revolution experiment is larger than that obtained from pinning force measurement. (c) 2008 Wiley Periodicals. Inc.

DOI： 10.1002/eeej.20586

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

Numerical simulation of the superconducting magnetically levitated bogie (JR Maglev) has been studied. Electrodynamic suspension is used for levitation and guidance. Although this suspension needs no gap control, damping factor of the system is shown to be small. Therefore additional damping system is considered. The passive and the active damper coil system are introduced to increase damping of the levitation system. Running simulation of the bogie when the train accelerates is undertaken. The passive damper coil decreases oscillation of the bogie. Although the active damper system shows larger effect, it needs much electric power. The passive damper coil shows enough damping factor in case of normal acceleration.

DOI： 10.1109/TMAG.2008.2002788

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

In the conventional conveyance system, noise, friction and vibration occur under operation. We have developed the hybrid magnetically levitated system. In this system, pinning force of high temperature bulk super conductor is used for the levitation and guidance. This system needs no control system for levitation and guidance. To increase levitation force, repulsive force of the permanent magnet is used. The method of the propulsion for this hybrid conveyance system is considered. The basic design and propulsion method is shown. Influence of the propulsion system on pinning force, levitation and guidance characteristics of the carrier is shown. The carrier shows stable levitation using the new propulsion method.

DOI： 10.1109/TASC.2007.898529

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

The liner synchronous generator system is developed. In most of vehicles, vibration occurs. Mechanical vibration of the vehicle is absorbed by mechanical dampers and other facilities, so this energy is consumed wastefully. Using the linear generator, energy of vibration is converted to electrical energy. Also, this generator works as an active damper. The experimental device has been developed. The method of the experiment is shown. The vibration data is measured by the handy measurement system and vibration is reproduced at the vibration generator connected to the linear generator. The basic characteristics of the liner generator system are shown. The vibration data of the car is measured. Using this data, characteristics of the generator is observed. The experimental results show the linear works adequately.

DOI： 10.1109/TMAG.2005.854984

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Language：Japanese   Publisher：The Institute of Electrical Engineers of Japan  

Magnetic bearing using pining force of a permanent magnet and a high-temperature superconductor has been developed. Additional permanent magnet is introduced to increase the levitation force of the magnetic bearing. In this hybrid magnetic bearing system, levitation force is mainly given by the repulsive force of the permanent magnets, and stability for the lateral direction is given by pining force of the superconductor. <BR>The experimental device is developed. A ring type superconductor and a bulk one are examined. Levitation characteristics of the hybrid magnetic bearing are measured. A bulk superconductor shows better characteristics both levitation and lateral stability than ring one. Levitation force of the hybrid system becomes about twice as large as that of the no-hybrid one. Although repulsive force of the permanent magnet decreases lateral stability of the system, its influence becomes small by choosing adequate position of the permanent magnets and the superconductor.

DOI： 10.1541/ieejias.123.784

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Other Link： https://jlc.jst.go.jp/DN/JALC/00230145212?from=CiNii

Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

The three dimensional vibration of the rotor in a HTSC-permanent magnet bearing system is studied. We have developed the bearing system which can revolve up to 12,000 rpm, and the three dimensional vibration of the rotor is measured with laser displacement sensors. The shape of the rotor has been improved, and influence of the air resistance: becomes small, The vibration of the rotor around the mechanical resonance frequency is investigated. Both columnar and conical behavior of the rotor are confirmed and mainly columnar motion is observed.

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Language：Japanese   Publisher：The Institute of Electrical Engineers of Japan  

A superconducting(SC) magnetically levitated (Maglev) transportation system has been developed in Japan and various experiments have been done in the new test line at Yamanashi prefecture. Although the superconducting electrodynamic suspension (EDS) system has the advantage of stable levitation without active control, various electromagnetic or mechanical disturbances can cause the change of gap length and the displacement or oscillation of the bogie. As the damping of the EDS system is shown to be small, additional damping factor is needed to increase the stability of the levitation under the influence of disturbance. Then the damper coil system is proposed. The copper coils are installed in front of the SC coils on the bogie. We have developed three dimensional numerical simulation program for the Maglev bogie. The damper coils system is included in this program, and running simulations of the Maglev bogie are undertaken. The damping factor for each rotational direction is shown. The running simulation when the bogie passes the lateral guideway displacement is calculated, and effect of the damper coils is clearly shown.

DOI： 10.1541/ieejias.121.417

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Other Link： https://jlc.jst.go.jp/DN/JALC/00360842142?from=CiNii

Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

Numerical simulation of a superconducting magnetically levitated bogie (JR Maglev) has been studied, A damper coil system was introduced to increase the damping of the levitation system. This damper roil system is designed for reducing the lateral and vertical vibration of the bogie, In this levitation system, the rotational motion is also caused by the lateral and vertical displacement of the bogie. Using the numerical simulation, its effect on the rotational motion of the bogie is assessed. The damper coil system is shown to improve damping for the rotational motion.

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Publishing type：Research paper (scientific journal)  

A superconducting (SC) magnetically levitated (Maglev) transportation system has been developed in Japan and various experiments have been done on the new test line in Yamanashi prefecture. Although the superconducting electrodynamic suspension (EDS) system has the advantage of stable levitation without active control, various electromagnetic or mechanical disturbances can change the gap length and cause the displacement or oscillation of the bogie. In this system, the severest disturbance is SC coil quenching. Therefore, it is important to determine the running characteristics of the Maglev train and to increase the stability in this case. We developed a three-dimensional numerical simulation program for the Maglev train. Using this program, a running simulation of the train for the Yamanashi new test track was undertaken in the case of SC coil quenching. Because of the damping characteristics of the EDS system, the influence of coil quenching is smaller at higher speeds. In the train model, the electromagnetic spring strength of the EDS system is larger than that of the mechanical spring of the secondary suspension system connecting the bogie and cabin. Therefore, influence of the quenching is only in the cabins connected to the quenched bogie. Demagnetization of the SC coil quenching is considered to increase the stability of the train. Although this method is useful to decrease large guidance force, lateral displacement, yaw and roll angle of the bogie, vertical displacement, and pitch angle become large.

DOI： 10.1002/(SICI)1520-6416(200001)130:1<95::AID-EEJ12>3.0.CO;2-I

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

;Numerical simulation of the superconducting magnetically levitated bogie (JR Maglev) has been studied. The active damper coil system is introduced. In this levitation system, the interaction between levitation and guidance is strong. This active damper coil system is designed for reducing the vertical vibration of the bogie, Using the numerical simulation, its effect on the lateral displacement of the bogie is assessed. The active damper coil system for the vertical vibration is shown to works as a passive damper for the the lateral vibration.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

The three dimensional vibration of the rotor in the HTSC-permanent magnet flywheel system is studied. The magnetic levitation using pining force of the HTSC bulk material has an advantage to achieve stable levitation without control. However the transient characteristics of the levitation is not clearly understood. We have developed the flywheel system which can revolve up to 12,000rpm, and the three dimensional vibration of the rotor are measured with laser displacement sensors. The vibration of the rotor around the mechanical resonance frequency is investigated. The rotor shows both columnar and conical behavior in the mechanical resonant state.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

A basic experimental device for a flywheel system using high temperature superconducting material (HTSC) is introduced, In this system, a circular shaped permanent magnet is installed on the rotor, and a YBaCuO plate is used for the stator. To increase the levitation force of the flywheel, an additional circular permanent magnet is installed under the YBaCuO plate in the stator. The maximum levitation force and rotational loss were examined. From the experimental results, this hybrid system shows better levitation characteristics than that without an additional permanent magnet.

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Publishing type：Research paper (scientific journal)  

The damping characteristic of the bogie motion is one of the most important issues to be investigated in the superconducting magnetically levitated system based on electrodynamic suspension (EDS). We have therefore studied the damping characteristics and the mechanism of magnetic damping. Electric circuits consisting of coil resistances and inductances can describe the electromagnetic behavior of the levitation system. By numerical calculation based on the electric-circuit equations combined with the equations of motion, damping characteristics of the bogie are examined for the system consisting only of levitation coils and superconducting coils, and also for the configuration with magnetic shielding structures incorporated. Furthermore, paying attention to the energy balance in the levitation and propulsion system when the bogie is forced to oscillate sinusoidally, we have investigated the relation between the input energy and the running speed, and compared the waveforms of levitation force and bogie oscillation to consider the characteristics and the mechanism of the damping. © 1999 Scripta Technica.

DOI： 10.1002/(SICI)1520-6416(19990430)127:2<49::AID-EEJ7>3.0.CO;2-X

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Publishing type：Research paper (international conference proceedings)  

The active damper coil system is designed to reduce the vertical vibration the superconducting magnetically levitated bogie (JR Maglev). Although it shows large effect on the control of the vertical vibration, its effect when the laterial oscillation of the bogie occurs is not understood. Using the three-dimensional numerical simulation, the effect of the active damper system on the lateral oscillation of the bogie is assessed.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

A new numerical analysis of current density and electric field with positive-corona discharge in a wire-to-plane geometry is made in this paper. Some approximate or numerical methods have been often used to estimate Poissonian field in a unipolar corona-discharge space. However, they were not always useful from viewpoints of accuracy or convenience.
In this study, current flow-line coordinate is introduced to solve Poissonian equation combining with current continuity equation. The method has an advantage of both having the same convenience as the conventional approximations and having the same accuracy as the conventional numerical methods. II takes much less computing time and memory capacity than the conventional ones. It is applied to the computation of current flow lines, equipotential surfaces, electric field strength, current density, and charge density.
Good agreements are found between the calculated current and electric field distributions and the measured ones, on the plane electrode. Poissonian current flow lines are quite different from Laplacian ones. It is therefore, concluded that the application of Deutsch approximation to the Poissonian-field analysis is invalid and that the numerical method as presented in this paper is required. (C) 1998 Elsevier Science B.V. All rights reserved.

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A superconducting (SC) magnetically levitated (Maglev) transportation system has been developed in Japan and various experiments have been done in the new test line at Yamanashi prefecture. Although the superconducting electrodynamic suspension (EDS) system has the advantage of stable levitation without active control, various electromagnetic or mechanical disturbances can cause the change of gap length and the displacement or oscillation of the bogie. In this system, the severest disturbance is SC coil quenching. Therefore it is important to show the running characteristics of the Maglev train and to increase the stability in this case. We developed three dimensional numerical simulation program for the Maglev train. Using this program, running simulation of the train for Yamanashi new test track was undertaken in the case of SC coil quenching. Because of the damping characteristics of the EDS system, influence of the coil quenching is smaller at a higher speed. In the train model, electromagnetic spring strength of the EDS system is larger than mechanical spring of the secondary suspension system connecting a bogie and cabins. Therefore influence of the quenching is only seen in the cabins connected to the quenched bogie. Demagnetization of the SC coil quenching is considered to increase the stability of the train. Although this method is useful to decrease large guidance force, lateral displacement, yaw and roll angle of the bogie, vertical displacement and pitch angle become large. © 1998, The Institute of Electrical Engineers of Japan. All rights reserved.

DOI： 10.1541/ieejias.118.937

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The damping characteristic of the bogie motion is one of the most important issues to be investigated in the superconducting magnetically levitated system based on the Electrodynamic Suspension (EDS). We have therefore studied the damping characteristics and the mechanism of magnetic damping. Electric circuits consisting of coil resistances and inductances can describe the electromagnetic behavior of the levitation system. By numerical calculation based on the electric circuit equations combined with the equations of motion, damping characteristics of the bogie are examined for the system consisting only of levitation coils and superconducting coils and also for the configuration with magnetic shielding structures incorporated. Furthermore, paying attention to the energy balance in the levitation and propulsion system when the bogie is forced to oscillate sinusoidally, we have investigated the relation between the input energy and the running speed and compared the waveforms of levitation force and bogie oscillation to consider the characteristics and the mechanism of the damping. © 1997, The Institute of Electrical Engineers of Japan. All rights reserved.

DOI： 10.1541/ieejias.117.1015

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Language：Japanese   Publisher：The Institute of Electrical Engineers of Japan  

The side wall electrodynamic suspension (EDS) system has the advantage of not requiring gap control, and the magnetic drag is smaller than for the repulsive arrangement. This levitation system is applied in the JR magnetically levitated (Maglev) transportation system. From the experimental results in the Miyazaki test line, this system has large damping. However calculation results shows this system has little damping, and reason of large damping in the test line is not clearly shown. So running characteristics and improved design can be investigated using numerical analysis to improve riding comfort and reduce loss of the superconducting magnet. As this is non-linear system, complicated analysis is needed. Usually running characteristics of this EDS system is given from the numerical analysis which combines electromagnetic phenomena with mechanical movement equation. However this method requires very large calculation times. So more simple suspension model of this EDS system is needed. This paper shows levitation and guidance characteristics of this system, and develops the equivalent suspension system model from the electric circuit characteristics of this system. The approximation is developed by a simple function of the velocity and position of the bogie. The dynamic movement of the bogie was calculated using this model easily, and the results corresponds to the results given by the electric circuit model.

DOI： 10.1541/ieejias.117.758

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

Numerical simulation of running characteristics of the superconducting magnetically levitated system has been undertaken. A three-dimensional running simulation program of the bogie motion has been developed to verify the stability in an emergency, that is, in the case of superconducting (SC) coil quenching. The influence of the coil quenching is most pronounced in the SC coil adjacent to the quenched coil. For this SC coil, due to the flux conservation characteristic, its current is changed only 5%. However the levitation and guidance force become about twice and four times as large as those in the normal state respectively.

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Venue：Singapore Singapore  

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Venue：大阪市立大学文化交流センター  

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Venue：Penang,Malaysia  

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Venue：立命館大学  

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Venue：立命館大学  

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Venue：崇城大学  

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Venue：祟城大学  

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Venue：関西大学  

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Venue：関西大学  

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Venue：関西大学  

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Venue：神戸市立工業高等専門学校  

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Venue：神戸市立工業高等専門学校  

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Event date： 2015.7

Venue：RWTH Aachen University  

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Venue：鉄道総合技術研究所 国立研究所  

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Venue：Tokyo  

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Venue：金沢  

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Venue：金沢大学  

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Venue：金沢大学  

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Venue：Tokyo  

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Venue：高知工科大学  

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Event date： 2012.10

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Event date： 2011.7

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Event date： 2011.5

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Event date： 2010.12

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Event date： 2010.12

永久磁石-HTSCハイブリッド磁気浮上搬送車の推進コイル励磁時間制御に関する検討, 西尾 隆平,池田 昌訓,佐々木 亮輔,大橋 俊介,電気学会半導体電力変換・モータードライブリニアドライブ研究会資料, SPC-10-184,LD-10-082,MD-10-060 (2010)

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Event date： 2010.12

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Event date： 2010

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Event date： 2010

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Event date： 2009.1

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Event date： 2009

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Event date： 2008.12

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Event date： 2007.9

Venue：Lille， France  

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Event date： 2006

Venue：神戸  

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Event date： 2006

Venue：神戸  

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Event date： 2006

Venue：神戸  

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Event date： 2006

Venue：Dresden, Germany  

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Event date： 2005.6

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Event date： 2005.3

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Event date： 2005.1

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Event date： 2005

Venue：Hyogo  

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Event date： 2005

Venue：Niigata  

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Event date： 2004.9

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Event date： 2004.7

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Event date： 2003.12

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Event date： 2003.9

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Event date： 2002.9

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Event date： 2001.10

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Event date： 2001

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Event date： 1999.10

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Event date： 1998.8

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Event date： 1998.6

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Event date： 1998.4

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Event date： 1997.9

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Event date： 1996.12

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Event date： 1996.10

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Event date： 1996.6

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Event date： 1995.11

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Event date： 1995.10

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Event date： 1995.9

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Event date： 1995.4

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Event date： 1995.4

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Event date： 1994.9

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Country：Japan

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