JPS6373865A - Reaction plate for linear motor - Google Patents

Abstract

PURPOSE:To improve dimensional accuracy and reliability by selecting specific values of an inside height of a secondary conductor and a bending angle of a projecting piece. CONSTITUTION:To form a reaction plate for linear motor, both side edges of a secondary conductor 2 with good conductivity coated on a secondary iron core 1 is bent to the rear side of said secondary core 1, said bent part is then caulked, and the secondary core 1 is held between an upper wall 2a and a projecting piece 2c continuous to the lower end of a sidewall 2b. Also, a corrosion-proof layer 3 lies between said iron core 1 and secondary conductor 2. In this case, an inside height H of the secondary conductor 2 is made sufficiently layer than a thickness h of the secondary core 1 including a thickness of the corrosion-proof layer 3 ad a bending angle theta of the projecting piece 2c from the sidewall 2d is set at 90 deg. or more. Thus, it is enough to press only the projecting piece 2c vertically on caulking and bending of the upper wall 2a can be made exceedingly small.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a reaction plate for a linear motor, particularly a reaction plate that reduces swelling caused by caulking force of a secondary conductor.

[Conventional technology and its problems]

As shown in Figure 3, the reaction plates of linear motors used in transportation systems and goods transportation systems are placed on both sides of a highly conductive secondary conductor (generally an aluminum conductor) 2 that covers a secondary iron core 1. Bend the edge on the back side Q of the secondary conductor 1, and caulk this bent part to connect the upper wall 2a and side wall 2 of the secondary conductor.
Many of them have a structure in which the secondary iron core 1 is sandwiched between protrusions 2c continuous to the lower end of the iron core 1b.

Further, an anti-corrosion 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, if you form the secondary conductor 2 into the shape shown in Figure 4, cover it over the secondary iron core 1, and then caulk both sides, the upper wall of the secondary conductor Since the caulking force causes the secondary conductor to swell (as shown by the chain line in Figure 3) and a high-precision reaction plate cannot be obtained, the secondary conductor is caulked into a shape close to the most linear shape that requires less softness. It was devised to insert a secondary iron core into the section from the longitudinal direction.

However, in this case, the anti-corrosion layer 3 is made of a viscoelastic material that 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. Due to the elasticity and adhesiveness of that layer, it was difficult to insert the secondary conductor.

Therefore, the inventor made the anti-corrosion layer 3 into a composite layer as shown in FIG. By forming the layer 3b with a smooth film, it is possible to obtain the effect of suppressing electromagnetic noise and the effect of dissipating heat from the secondary conductor to the secondary iron core, and also to smoothly insert the secondary iron core from the length direction. We developed a technology to make this possible and filed a patent application under the name of the same applicant under Japanese Patent Application No. 138946/1983.

However, even if such a technique is adopted, the secondary conductor before crimping must have a shape with a slight side wall 2b as shown in FIG. When crimped, the upper wall 2a may warp and swell (although not as much as before), and there is still room for improvement in this regard in order to stably supply products with consistent performance and dimensional accuracy. It was left behind.

This invention has been made in view of the above, and aims to provide a reaction plate in which warping of the secondary conductor due to caulking force hardly occurs.

[Means for solving problems]

In order to eliminate the above-mentioned problems, this invention makes the inner rectangular height between the upper wall of the secondary conductor and the projecting piece larger than the secondary iron core, and the projecting piece is bent inward from the lower end of the side wall. 90° bending angle
This is what we have done.

[For production]

With such a structure, the bending angle of the side wall of the secondary conductor before inserting the secondary iron core can be set as the final bending angle. That is, if the final bending angle of the side wall is 90 degrees, as shown in FIG. By keeping it in the down position, it is possible to insert the secondary iron core into the inner rectangular portion from the length direction. Therefore, when caulking, it is only necessary to press the protruding piece 2c in the vertical direction, and the force P at this time has almost no effect on the deformation of the upper wall 2a, so that the warpage of the upper wall is extremely small.

〔Example〕

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

In addition, protrusions 2c and '2 connected to each side wall 2b of the secondary conductor.
c has a bending angle θ from the side wall 2b of 90° or more, and only the tip thereof is placed against the lower surface side of the secondary iron core.

Furthermore, the anticorrosion layer 3 may be of course a single layer, but it may be a two layer consisting of the above-mentioned first Jfj 3a and second layer 3b.
A composite anti-corrosion layer is used to ensure smooth insertion of the secondary core, prevent electromagnetic noise, and effectively dissipate heat from the secondary conductor.

Note that the electromagnetic force acting on the secondary conductor 2 is a force that tends to push the conductor downward, so the bent portion of the protruding piece 2c does not need to withstand the electromagnetic force, and may warp due to temperature rise during use. It is sufficient to withstand a force sufficient to restrain thermal deformation such as, etc., and to bring the secondary conductor 2 and anticorrosion layer 3 into close contact with each other so as not to generate electromagnetic noise. Therefore, even if the projecting piece 2c is bent by 90 degrees or more as shown in the figure, there is no fear that the integration force between the secondary iron core and the secondary conductor will be insufficient.

1 is a screw provided to prevent the secondary conductor from moving in the longitudinal direction due to thrust force.

[Effect] As described above, according to the present invention, the inner rectangular height of the secondary conductor is made larger than the thickness of the secondary iron core, and the bending angle of the protruding piece is made 9.
By setting the angle to 0° or more, there is no need to apply bending force to the corner of the upper wall and side wall of the secondary conductor when creasing, so that the upper surface of the secondary conductor does not warp. The effect is that a reaction plate with very high dimensional accuracy and reliability can be provided.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an example of the glue axicon plate of the present invention, Fig. 2 is a cross-sectional view of the secondary conductor before caulking the reaction plate, and Fig. 3 is a cross-sectional view showing an example of the adhesive axicon plate of the present invention. A cross-sectional view of the reaction plate. Figure 4 is a cross-sectional view of the secondary conductor that is installed over the secondary iron core before being crimped. Figure 5 is a sectional view of the secondary conductor that is inserted from the length of the secondary iron core. FIG. 1... Secondary iron core, 2... Secondary conductor, 2a... Upper wall,
2b...Side wall, 2c...Protrusion piece, 3...Corrosion protection layer, 3
a...Adhesive or non-adhesive elastic sheet, 3b...
Smooth film sheet, 4 screws

Claims (2)

[Claims] (1) A secondary conductor and a secondary iron core having side walls on both sides of the upper wall, and a series of protrusions bent inward at the lower end of each side wall, with an anti-corrosion layer interposed between them, In a reaction plate for a linear motor in which a secondary iron core is sandwiched between the upper wall of the secondary conductor and the projecting piece, the inner rectangular height of the secondary conductor is made larger than that of the secondary iron core, A reaction plate for a linear motor, characterized in that the protrusion has a bending angle of 90° or more. (2) The above-mentioned anti-corrosion layer is a composite anti-corrosion layer formed by laminating a smooth film on the surface of an adhesive or non-adhesive elastic sheet placed on the side of the secondary iron core. The reaction plate for linear motors described in (1).