We have reported various characteristics of systems using an X-Y LIM (X-Y Linear Induction Motor) for non-contact transport. Until now, transport, required coincidence of the center of gravity of the bogie-truck and the center of that truck. The center of gravity on the bogie-truck, however, is not always located at the center of the truck because of the load shape, weight, and so forth. We investigated the following aspects of fundamental switching performance of the system: (1) differences in switching caused by shifts in the center of gravity of the bogie-truck; (2) the relationship between starting thrust and switching angle for shifts in the center-of-gravity position on the bogie-truck; and (3) the relationship between starting thrust and rotational angle for center-of-gravity position shifts.

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An X-Y Linear Induction motor (X-Y LIM) is a structure having two windings in the horizontal -X and Y- axes directions. One-direction thrust is created by exciting one winding, and a two-dimensional drive becomes possible by exciting two windings at the same time. We modeled only one pole of an X-Y LIM having a three-phase, six-pole structure, and used a three-dimensional finite element analysis method that ignored end effect and the influence of winding overhang. The following characteristics were examined to obtain guidelines for future designs: (1) flux density with respect to slot depth; (2) flux density with respect to the primary current; and (3) the relation-ship between the air gap and the thrust.

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An X-Y linear induction motor (X-Y LIM) is a structure having two windings in the horizontal x^- and y^- axis directions. Exciting one winding generates a one-directional thrust, and a two-dimensional drive becomes possible by exciting two windings at the same time.
In this paper, we propose a suitable planning method based on the three-dimensional finite element method, whereby fundamental equations used in analysis are derived to extract one pole of an X-Y LIM. The following characteristics were examined to obtain guidelines for future designs: (1) magnetic flux density with respect to gap and slot depth, (2) magnetic flux density with respect to slot depth and tooth width, (3) starting thrust with respect to primary current and gap, and (4) relationship between the frequency and magnetic flux density.

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Recently miniaturization and performance enhancement of electronic equipment are remarkable. The gap between the conductors on a printed circuit board becomes much smaller, and the high insulation reliability is required for the printed circuit board. In the printed circuit board, it is also abounding in the opportunity of which various surge are applied, and it is abounding of printed circuit board of which the inverter surge is always applied by the development of recent power electronics. From such background, surge dielectric strength between printed circuit board conductive foil was examined. The experiment was carried out by FR-4 model printed circuit board. As a result, surge dielectric strength of the 0.03mm-0.5mm gap length sample was 0.2kV-2.5kV. In the sample with solder resist coating, surge dielectric strength between conductive foil was 9kV-10.5kV.

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A wave soldering system has been used for more than 50 years in the process of circuit board assembly, but the needs for maintenance-free operations, high solderability, and downsizing of the solder capacity have still not been met. To meet these requirements, the authors made practical use of a wave soldering system in which a direct thrust is applied to the molten solder by means of a linear electromagnetic pump, thus realizing maintenance-free system, a 1/10 to 1/20 reduction of the defect rate, and a 57% reduction of the solder capacity.

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The fundamental characteristics of transport and switching systems using X-Y linear induction motor (LIM) are reported with the aim of enabling the non-contact transport. Further, the switching of a carrier in which the position of the center of gravity shifts is investigated. We examine the cose in which the center of gravity does not exist at the center of the carrier and shift in the axial directions, but may exist at any position on the carrier. Switching characteristics for the existence of the center of gravity at any position can know from the ratio of the length and width of the carrier, and fundamental switching characteristics of the carrier.

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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.

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When a microgrid is operated in the islanding mode, the operator must satisfy the power quality demand by compensating the active and reactive power using several types of distributed power generation (DG) systems. In this paper, a method to stabilize the system frequency fluctuations and voltage fluctuations of the islanding microgrid is suggested. Extending the suggested “combined cascade control method” which can realize the power compensation without interferences between several types of DGs, “hybrid control” strucuture is proposed and negative effects of control and measurement signal delays on a control are reduced. Moreover, a control of the state of charge (SoC) of energy storage devices is added. For the stabilization of the system voltage, the energy storage is driven by “STATCOM model control”. Experiments have been carried out to confirm the effects of these methods by use of the model microgrid system, and satisfying results were received.

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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. 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.

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The ordinary experimental equipment has a long stroke or a large cylindrical rotating secondary side in order to measure the drive characteristics of Linear Induction Motor (LIM). In this paper, we propose the measurement method of the drive characteristics of LIM with the experimental equipment implemented a disc-shaped secondary side. This method makes the experimental equipment smaller in size. It has been shown that the drive characteristics of LIM can be successfully measured.

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To reduce the energy capacity and power capacity of energy storage systems (ESSs) which is necessary to compensate power fluctuation in a power grid, the control of power that is used by electrical appliances on the demand side is considered. In this paper, the use of heat pump air conditioner for power fluctuation compensation is focused. The basic power consumption characteristics and processed heat characteristics of heat pump air conditioner which is measured by experiment using real machine is reported. Based on the measured characteristics, a simple model of heat pump is proposed. Using this heat pump model, simulations were carried out to analyse the amount of ESS's capacity that can be reduced by controlling the heat pump to compensate power fluctuations.

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