JPH0785645B2 - Linear plate for linear motor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a reaction plate for a linear motor, and more particularly to a reaction plate in which swelling of a secondary conductor due to a caulking force is reduced.

[Conventional technology and its problems]

As shown in FIG. 3, the reaction plate of a linear motor used in a transportation system or a transportation system includes a secondary iron core 1 on both sides of a secondary conductor (generally an aluminum conductor) 2 of good conductivity. Bend the edge to the back side of the secondary iron core 1,
In many cases, the bent portion is crimped to hold the secondary iron core 1 between the upper wall 2a of the secondary conductor and the projecting piece 2c connected to the lower end of the side wall 2b.

Further, an anticorrosion layer 3 is interposed between the secondary iron core 1 and the secondary conductor 2 for the purpose of eliminating electrolytic corrosion.

By the way, when the secondary conductor 2 is formed into a shape as shown in FIG. 4, and the secondary iron core 1 is covered with the secondary conductor 2 from above and then both sides are caulked, the upper wall of the secondary conductor is The swaging force swells like the chain line in Fig. 3 and a highly accurate reaction plate cannot be obtained. Therefore, the secondary conductor should be shaped into a shape close to the final shape that requires less swaging, It was conceived to insert the secondary iron core from the length direction. However, in this case, the anticorrosion layer 3 is formed of a viscoelastic body which has excellent adhesion to the secondary iron core and the secondary conductor and is effective in preventing electromagnetic noise due to vibration of the secondary conductor and temperature rise due to Joule heat. There is a problem that it is difficult to insert the secondary conductor due to the elasticity and adhesiveness of the layer.

Therefore, the inventor has made the anticorrosion layer 3 a composite layer as shown in FIG. 3, and the first layer 3a on the secondary iron core side thereof is made of an adhesive sheet or a highly adhesive elastic sheet to form a second layer on the upper surface thereof. By forming the layer 3b with a smooth film, it is possible to smoothly insert the secondary iron core in the length direction after suppressing the electromagnetic noise and radiating the heat from the secondary conductor to the secondary iron core. We have developed a technology to make it possible, and have applied it to Japanese Patent Application No. 61-138946.
-296762) filed under the name of the same applicant.

However, even if such a technique is adopted, it is necessary for the secondary conductor before caulking to have a shape in which the side wall 2b is slightly opened as shown in FIG. 5, so that the state shown in FIG. When caulking, the upper wall 2a may warp and swell even if it is not as conventional as possible.Therefore, there is room for improvement in this regard in order to stably supply products with consistent performance and dimensional accuracy. Was there.

The present invention has been made in view of the above, and an object of the present invention is to provide a reaction plate in which the warping of the secondary conductor due to the caulking force hardly occurs.

[Means for solving problems]

In order to eliminate the above-mentioned problems, the present invention makes the inner rectangular height between the upper wall of the secondary conductor and the protruding piece larger than that of the secondary iron core, and prevents the protruding piece bent inward from the lower end of the side wall. 90 ° bending angle
That is all.

[Action]

With such a structure, the bending angle of the side wall of the secondary conductor before inserting the secondary iron core can be set to the final bending angle. That is, when the final bending angle of the side wall is 90 °, as shown in FIG.
Even if it is bent at 90 ° from 2a, it is possible to insert the secondary iron core into the inner rectangular portion from the lengthwise direction by leaving the protruding piece 2c in a partially bent state. Therefore, at the time of caulking, only the protruding piece 2c needs to be pressed in the vertical direction, and the force P at this time has almost no influence on the deformation of the upper wall 2a, so that the warp of the upper wall becomes extremely small.

〔Example〕

FIG. 1 shows an embodiment of the present invention. The inner rectangular height H of the secondary conductor 2 in this reaction plate is made sufficiently larger than the thickness h of the secondary iron core 1 including the thickness of the anticorrosion layer 3.

Further, the protrusions 2c, 2c connected to the side walls 2b of the secondary conductor have a bending angle θ from the side wall 2b of 90 ° or more, and only their tip portions are applied to the lower surface side of the secondary iron core.

Further, the anticorrosion layer 3 may be a single layer, of course, but the secondary iron core composed of the first layer 3a and the second layer 3b is smoothly inserted, electromagnetic noise is prevented, and the secondary conductor is prevented. A composite anticorrosion layer effective for heat dissipation is used.

Since the electromagnetic force acting on the secondary conductor 2 is a force that pushes down the conductor, the bent portion of the projecting piece 2c does not have to withstand the electromagnetic force, and warpage due to temperature rise during use, etc. It is only necessary to withstand the thermal deformation of No. 2 and to withstand the force sufficient to bring the secondary conductor 2 and the anticorrosion layer 3 into close contact with each other so that electromagnetic noise is not generated. Therefore, as shown in the drawing, even if the projecting piece 2c is bent at 90 ° or more, there is no fear that the integrating force between the secondary iron core and the secondary conductor will be insufficient.

Reference numeral 4 in FIG. 1 denotes a screw provided to prevent longitudinal movement of the secondary conductor due to thrust.

〔effect〕

As described above, according to the present invention, the inner rectangular height of the secondary conductor is made larger than the secondary iron core thickness, and the bending angle of the projecting piece is 90%.
By setting the angle to be at least °, it is not necessary to apply a bending force to the corners of the upper and side walls of the secondary conductor during crimping, so that the upper surface of the secondary conductor does not warp, The effect that a reaction plate with extremely high accuracy and reliability can be provided is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a reaction plate of the present invention, FIG. 2 is a sectional view of a secondary conductor of the reaction plate before being caulked, and FIG. 3 is a reaction previously proposed by the present applicant. Fig. 4 is a cross-sectional view of the plate, Fig. 4 is a cross-sectional view of the secondary conductor before it is mounted on the secondary iron core from above, and Fig. 5 is a cross-sectional view of the secondary conductor before the secondary iron core is inserted from the longitudinal direction. FIG. 1 ... Secondary iron core, 2 ... Secondary conductor, 2a ... Upper wall, 2b ...
… Side wall, 2c… Projection piece, 3… Anticorrosion layer, 3a… Adhesive or non-adhesive elastic sheet, 3b… Smooth film sheet, 4 …… Screw

Claims (2)

[Claims] 1. A secondary conductor, which has side walls on both sides of an upper wall, and a bottom end of each side wall, in which a projecting piece bent inward is connected, and a secondary conductor.
In a reaction plate for a linear motor in which a secondary iron core is combined with an anticorrosion layer interposed between the secondary iron core and the upper wall of the secondary conductor and the projecting piece, the secondary iron core is combined. A reaction plate for a linear motor, characterized in that the inner rectangular height of the conductor is larger than that of the secondary iron core, and the bending angle of the projecting piece is 90 ° or more. 2. The anticorrosion layer is a composite anticorrosion layer formed by laminating a smooth film on the surface of an adhesive or non-adhesive elastic sheet disposed on the secondary iron core side. Reaction plate for linear motor as set forth in the range (1).