JPS5821802A - Fixing of ground installation coil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fixing a near motor ground-mounted coil to a structure.

The ground-mounted coil of a linear motor is a coil that is attached to a track laid on the ground and uses electromagnetic force to drive a vehicle. Since such ground-mounted coils are used while being attached to tracks, they are exposed to all weather conditions and are also affected by electromagnetic forces generated by on-vehicle coils. Therefore, in order to withstand these harsh conditions, a molded coil whose exterior is robustly molded with a molding material is generally used as a ground-installed coil.

FIGS. 1 and 2 show the structure of such a conventional ground-installed coil. The ground-installed coil 1 is composed of a coil conductor 2 in which a conductor is wound in a rectangular shape with multiple turns, and an insulating structural material 3 that is coated around the coil conductor 2 and has excellent weather resistance, water resistance, and mechanical strength. . Note that this insulating structure phase 3 has a tapered surface 4 on its side surface. As this insulating structure material 3, sheet molding compound (hereinafter referred to as SMC), resin concrete, or epoxy mold is used.

The above-mentioned SMC is a semi-cured sheet made by mixing a thermosetting resin, such as an unsaturated polyester resin, with glass rectangular fibers, powder filler, catalyst, internal mold release agent, pigment, thickener, etc. The resin concrete is a mixture of thermosetting resin, for example, unsaturated polyester resin, with gravel and sand.

Furthermore, the above-mentioned epoxy mold is a mixture of an epoxy resin, a curing agent, and a powder filler.

Conventionally, the ground-installed coil 1 having such a structure has been directly buried and fixed in a ground structure 5 as shown in FIG. However, since a large amount of aluminum is used for the material of the coil conductor 2 and the ground structure 5 is made of concrete, the linear expansion coefficients of the ground installed coil 1 and the ground structure 50 are different. For this reason, there was a high risk that the ground-installed coil 1 or the Jm upper structure 5 would be destroyed by thermal stress due to changes in air temperature or changes in flow rate due to solar radiation.

Therefore, by inserting a spacer between the ground-installed coil 1 and the ground-structure 5, the ground-installed coil 1 and the
A method has been proposed for alleviating the thermal stress caused by the opening of the lhJ-structure 5. However, in this method, the insulation structure material 3
Since it is necessary to attach the entire tape 7 at an angle of 10 to 25 degrees to the side of the insulating structure material 3, the wall thickness of the insulating structure material 3 at the bottom becomes much larger than that at the top (for example, if the coil height is 90 m, the thickness at the top and bottom The thickness difference is 16 to 42 mm). Therefore, the wall thickness becomes extremely non-uniform, and cracks are likely to occur in the insulating structure material 3.<, -1: There is a disadvantage that the material of the insulating structure material 3 is wasted.

Here, the reason why the side surface of the insulating structure material 3 is tapered at an angle of 10 to 25 degrees is that the ground structure 5
This is so that the spacer can be taken out from the ground structure 5 and the ground installed coil 1 can be taken out from the groove of the ground structure 5.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, an object of the present invention is to provide a method for fixing a coil installed on the ground, which completely prevents the occurrence of cranking of the insulating structural material and eliminates waste of materials.

The above object of the present invention is achieved by using a ground coil for levitation as a ground installation coil, since the operating voltage is low and the electromagnetic force that the coil receives is much smaller than that of a ground coil for propulsion and guidance. Focusing on the fact that the probability of this occurring is extremely low9 and that it is highly unlikely that a ground-mounted coil would be taken out of the groove of a ground-based structure, we developed a material that can be used as a spacer material between the ground-mounted coil and the above-ground structure. This is achieved by using a flexible resin-impregnated laminate and by reducing the angle of the tapered portion provided on the side surface of the insulating structural material.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a cross-sectional view showing an embodiment of the ground-installed coil fixing method according to the present invention. However, similar or identical components to those in FIGS. 1 to 3 are indicated using the same reference numerals.

The ground-installed coil 1 includes a coil conductor 2 formed by winding a conductor in a rectangular shape with a plurality of turns, and an insulating structure 3 having a tapered side surface 4 molded around the coil conductor 2. The ground-installed coil 1 having such a structure is buried between the above-ground structure 5 and a spacer 6 made of a flexible resin-impregnated laminate. The flexible resin laminate is manufactured by using a polyester nonwoven fabric as a base material, impregnating it with a flexible epoxy resin, and then heat-forming it.

FIG. 5 shows another embodiment of the present invention, in which similar or identical components to those in FIG. 4 are designated by the same reference numerals. The feature of this embodiment is that a protrusion 7 is provided on the spacer 6 in order to make it difficult for the spacer 6 to be pulled out from the ground structure 5, and the other configurations are the same as those of the previous embodiment.

The feature of the above embodiment is that the spacer 6 is made of a flexible resin-impregnated laminate having appropriate hardness and excellent wear resistance. I will explain why.

Generally, when a spacer is buried between a ground-installed coil and a ground structure, the stress σ generated at the end of the coil can be approximated by the following equation.

However, α1 is the coefficient of linear expansion of the coil, α2 is the coefficient of linear expansion of the ground structure, ΔT is the amount of temperature change since the coil was buried, and E
1Fi coil's average longitudinal elastic modulus, E3 is spacer's longitudinal elastic modulus in the thickness direction, A+U coil cross-sectional area, A3Fi spacer area subject to thermal stress, t is spacer thickness, and l is coil-side length 7 It shows. The denominator value on the right side of equation (1) is always larger than l, and the smaller E3 is compared to E, or the larger the spacer value t, the thicker the denominator value becomes. Stress σ becomes smaller.

Since the adhesive force between the structure 5 and the ground-installed coil 1 and spacer 6 buried in it is orange and slight, when a force is applied in the X direction in Fig. 4, in the case of,
There is a risk that the ground-installed coil 1 will fall off the ground structure 5. Further, even if θ\0 degrees, there is a risk that the spacer 6 pinched between the ground-installed coil 1 and the ground structure 5 will deform and the coil will move relative to the ground structure 5. The amount of movement δ in the X direction can be expressed by the following equation.

However, the force applied to the entire Ptd coil in the X direction, θ is the angle of the tapered portion, the total length of the IJt coil center line, and h is the height of the coil. The angle θ of the tapered part is 0 degrees〈θ〈9
CO5θ decreases and sinθ increases as it increases in the 0 degree range, so it can be seen that the movement amount δ shown in equation (2) decreases as θ decreases. I cut it,
It can be seen that as E3 becomes larger, δ becomes smaller.

Therefore, if the taper angle is made smaller according to equations (1) and (2), the amount of movement δ will increase, causing an abnormality in the traveling system. Ushita, thickness direction elastic modulus E3 of spacer 6
If is too large, the amount of movement δ will be small, but the thermal stress σ generated in the coil will be large. Conversely, if the longitudinal elastic modulus E3 in the thickness direction of the spacer is made smaller, the stress σ generated in the coil becomes smaller, but the amount of movement δ increases, so the longitudinal elastic modulus E3 in the thickness direction of the spacer 6 is set to a suitable value. There is a need.

Based on the above considerations, rubber with a cushioning effect can be considered as the material for the spacer 6, but rubber usually has a longitudinal elastic modulus of 0.
．． It is very soft at around 2 Kq/mm2, and there is concern that it will gradually wear out due to repeated electromagnetic force. To prevent this wear, it is possible to use hard rubber such as nitrile rubber or urethane rubber, but the former is weak in ozone and acid resistance, and the latter is weak in acid and alkali resistance, so it cannot be used in all weather conditions. There is a drawback that it cannot be done.

For this reason, a flexible resin-impregnated laminate has been used as a spacer material that has appropriate hardness and can be used in all weather conditions.

According to this embodiment, a ground-installed coil 1 and a structure 5 are installed on the ground.
Since a spacer 6 made of a flexible resin-impregnated laminate having appropriate hardness and excellent wear resistance is sandwiched between the insulation structure material 3 and This has the effect of improving crank resistance and reducing waste of the material of the insulating structure material 3.

As is clear from the above description, according to the present invention, by interposing a spacer made of a flexible resin-impregnated laminate between the ground-installed coil and the ground structure, cranking of the insulating structure material can be prevented. In addition, it is possible to provide a ground-installed coil fixing method that eliminates waste in each phase.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional ground-mounted coil, and Figure 2 is a perspective view of a conventional ground-mounted coil.
Figure 3 is a cross-sectional view showing a ground-installed coil fixed to an above-ground structure according to the prior art, and Figure 4 is a ground-installed coil fixing method according to the present invention (9). FIG. 5 is a cross-sectional view showing another embodiment of the method for fixing a ground-installed coil according to the present invention. ■...Ground installation coil, 2...Coil conductor, 3 river insulation structure material, 4...Tapered surface, 5...Ground structure,
6...(10) 兇 1 METOKU MU KUNITOKU 5 m

Claims (1)

[Claims] 1. In a ground-mounted coil fixing method in which a rectangular coil conductor is fully coated with an insulating structure or a near motor levitation ground-mounted coil is fixed to a groove of a ground structure via a spacer, flexible resin impregnation is used as a spacer material. A ground-installed coil fixing method characterized by using a laminate.