JP3932214B2 - Propulsion levitation guide combined use system ground coil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a three-function integrated propulsion levitation guide combined use type ground coil that is used as a ground coil for a linear motor car and is capable of generating electromagnetic force in the propulsion, levitation, and guide directions.
[0002]
[Prior art]
Since the ground coils used in the magnetic levitation railway need to be installed in large numbers over the entire length of the guideway, they must be inexpensive and have excellent mass productivity. Therefore, as a ground coil for a magnetic levitation railway, instead of a combination of two coils, a ground coil for propulsion and a ground coil that also serves as a levitation guide, propulsion levitation that allows propulsion, levitation and guidance to function with one ground coil A grounding coil for both guide and use (hereinafter referred to as PLG system) has been developed.
[0003]
FIG. 2 shows an example of the mounting structure of the PLG ground coil 6. The PLG ground coil 6 is placed in the guide way 9 so as to face the superconducting magnets 8 provided on both sides of the linear motor car 7. It is fixed over the entire length. Two PLG ground coils 6 facing each other are connected to each other by a null flux cable 10.
[0004]
FIG. 3 shows details of the PLG ground coil 6. The PLG ground coil 6 contains one high-voltage 8-shaped coil 2 made of aluminum and is molded with an epoxy mold resin 3 having insulating properties. Has been. Underneath, a high-voltage outlet terminal 4 is provided so that a high-voltage three-phase power supply for running the linear motor car 7 in the front-rear direction is provided, and a null flux cable 10 that connects the opposing PLG ground coils 6 is provided. Is also connected to the high-pressure outlet terminal 4. Also, the PLG ground coil 6 is attached to the guideway 9 one by one in the order of phases, U, V, W, U.
[0005]
[Problems to be solved by the invention]
The conventional PLG ground coil 6 includes a single 8-shaped coil 2 in a single molded body and is molded with an epoxy mold resin 3 having insulating properties. For this reason, since it is necessary to manufacture a large number of PLG ground coils 6 and lay them on the guide way 9, the processing when forming the PLG ground coils 6 and the attaching work to the guide ways 9 become very complicated.
[0006]
As a solution to this problem, a method of forming a plurality of 8-shaped coils 2 as a single molded body with epoxy mold resin 3 is conceivable. However, this method has the following problems. That is,
(1) In order not to short-circuit between the phases of the 8-shaped coils having different phases, it is necessary to ensure an insulating characteristic higher than that of the ground between the 8-shaped coils having different phases.
(2) Generally, the thermal expansion coefficient of the epoxy mold resin used for power equipment is larger than the thermal expansion coefficient of the aluminum material used for the 8-shaped coil. At the time of energization and non-energization heat cycle during train running, gaps, delamination, cracks, etc. occur at the interface between the 8-shaped coil and the epoxy mold resin, which causes electrical problems such as partial discharge. And mechanical strength may be insufficient.
[0007]
Therefore, the present invention provides a PLG ground coil that does not cause gaps, separation or cracks at the interface between the figure 8 coil and the epoxy mold resin, and can form two figure 8 coils integrally. Objective.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a high voltage 8-shaped coil formed of an aluminum material and having functions of propulsion, levitation and guidance of a linear motor car is formed of epoxy mold resin, In the PLG ground coil mounted opposite to each other, two 8-shaped coils having different phases are arranged side by side, and are integrally formed with an epoxy mold resin having a thermal expansion coefficient equal to or less than that of an aluminum material. An insulating gap that can withstand the interphase voltage is formed between the 8-shaped coils.
[0009]
In such a PLG ground coil of the present invention, the thermal expansion coefficient of the epoxy mold resin is equal to or less than the thermal expansion coefficient of the aluminum material used for the 8-shaped coil. Thermal stress generated at the interface of the epoxy mold resin is relieved. Therefore, even if curing shrinkage at the time of molding and heat cycle at the time of actual use occur, there is no gap, peeling or cracking at the interface between the two 8-shaped coils and epoxy mold resin, so partial discharge occurs There will be no electrical problems such as or insufficient mechanical strength.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an example of an embodiment of the present invention.
In FIG. 1, the high voltage 8-shaped coil 2 uses a flat aluminum material and is wound into an 8-shaped shape to form a null flux circuit, and a non-woven cloth is wound around the aluminum flat material. At the same time, two 8-shaped coils 2 having different phases are arranged side by side at a distance. Further, the two 8-shaped coils 2 have the same or lower thermal expansion coefficient [0.000020 to 0.000025 (1 / ° C.)] than the aluminum material used, and have an epoxy resin 13 having an insulating property and a mechanical property. As a result, it is integrally formed.
For example, an epoxy mold resin (model number: CER-20) manufactured by Takao Kasei Kogyo Co., Ltd. may be used as the epoxy mold resin 13.
[0011]
Between the 8-shaped coils 2 of different phases, the insulation gap G2 (7 to 12 mm) between the ground is larger, so even if a voltage of different phases is applied during actual use, no corona discharge occurs, and dielectric breakdown occurs between the phases. Insulation gap GI (15 to 25 mm) by epoxy mold resin 13 is provided so as not to occur.
[0012]
Also, a high voltage lead terminal 4 is provided at the lower part of the PLG ground coil 1, a cable for applying a three-phase high voltage to the figure-shaped coil 2, and null fluxes of two opposing PLG ground coils 1. A null flux connection line 10 for connecting circuits is connected. Further, for mounting when the PLG ground coil 1 is mounted on the guideway 9, a total of four mounting holes 15 are provided for each of the 8-shaped coils 2.
[0013]
In the PLG ground coil 1 of the present invention, since the thermal expansion coefficient of the epoxy mold resin 13 is equal to or less than the thermal expansion coefficient of the aluminum material used for the figure-shaped coil 2, The thermal stress generated at the interface between the letter coil 2 and the epoxy mold resin 13 is relieved. Therefore, even if curing shrinkage at the time of molding and a heat cycle at the time of actual use occur, there is no gap, peeling or cracking at the interface between the two 8-shaped coils 2 and the epoxy mold resin 13. There will be no electrical problems such as the occurrence of electrical discharge or insufficient mechanical strength.
[0014]
As a result of conducting an electrical insulation test using the product of the present invention, with respect to the rated voltage of 22 kV, the insulation strength between phases is a commercial frequency withstand voltage of 130 kV or higher, a commercial frequency partial discharge voltage of 35 kV or higher, and a lightning Imp withstand voltage of 300 kV. It was confirmed that it had the above, and a sufficient margin for the required performance could be secured.
[0015]
【The invention's effect】
According to the PLG ground coil of the present invention, there is no gap, separation or crack at the interface between the 8-shaped coil and the epoxy mold resin, and the two 8-shaped coils can be molded integrally. It is possible to reduce the number of man-hours for manufacturing and mounting the ground coil.
[Brief description of the drawings]
1A and 1B show an example of an embodiment of a PLG ground coil according to the present invention, in which FIG. 1A is a front view and FIG. 1B is a side view.
FIG. 2 is a diagram showing a configuration example when a conventional PLG ground coil is attached to a guideway.
FIG. 3 is a diagram showing an example of a conventional PLG ground coil.
[Explanation of symbols]
1 PLG ground coil 2 8-shaped coil 9 Guideway 13 Epoxy mold resin

Claims (1)

A high voltage 8-shaped coil formed of an aluminum material wrapped with a non-woven fabric and having a propulsion, levitation and guide function for a linear motor car is molded with an epoxy mold resin and mounted opposite to the guideway. In the propulsion levitation guide combined type ground coil, two 8-shaped coils of different phases are arranged side by side, and the thermal expansion coefficient is integrally formed with an epoxy mold resin equivalent to that of an aluminum material. A propulsion levitation guide combined use type ground coil characterized in that an insulation gap of 15 to 25 mm capable of withstanding interphase voltage is formed between them.

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