JPS58145107A - Installation of electro-magnetic shading coil - Google Patents

Abstract

PURPOSE:To make the fixing more perfect without change with time by fitting a shading coil into the groove for coil mounting and deforming its outer circumferential section inward and applying pressure to its upper surface in order to expand the coil cross-section laterally and push back the outer circumferential section to outside. CONSTITUTION:A shading coil 4 is fitted into a groove 2, and the side face of the shading coil 4 is made to cut in a concave part 3 by strinking the upper face of the coil 4 and the side parts 5 of an iron core is tilted by striking it, and the coil is expanded sideway by again striking it. The internal stress which tries to return to outside is not only eliminated by pushing it back, but also internal stress to bend inside on the contrary is generated, which gives no looseness in the shading coil, and if, after processing the upper face of the iron core, its upper face is ground flat, this flatness is not lost with time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fitting a shaded coil to an electromagnetic core used in a relay or the like.

In AC electromagnets, a shading coil is fitted to the magnetic pole to prevent the moment when the magnetic force becomes O, but methods such as using an adhesive or caulking are used to fix the shading coil. The method using adhesive is simple but has low fixing reliability, and the caulking method has high fixing reliability but has the following drawbacks. Figure 1 shows an example of the conventional caulking method. It is made by punching silicon steel + N into the shape shown in the figure with an 1E magnet core and stacking an appropriate number of plates. 2 is a groove in which the shaded coil is fitted, and 1h of the groove is
A recess 3 is further formed in the i. The shading coil 4 is made of copper and is soft, so after fitting it into the groove 2, by hitting the -1- part of the coil, the coil is spread horizontally and bitten into the recess 8. Let it happen. Figure JA shows this state.In order to further ensure the fixation of the coil 1, the head 5 of the iron core 1 is struck from both sides to the outside of the groove 2 as shown in Figure 1B. Slightly fold the part inward, then Figure 1C
As shown in , the magnetic pole face is polished to a flat surface so that it can come into close contact with the armature. In this method, the edge of the upper iron core where the shading coil 4 is dug into the recess 3 is placed on the side m1 of the shading coil.
Since the shading coil is pressed from above, it seems that the fixation of the shading coil is extremely strong, or it may become loose over time. That is, as shown in Fig. 1B, the head of the iron core is struck from both sides to knock down the edge of A42, but at this time, the elastic return by θ is smaller than the amount of deformation X caused by the strike. Yes, and X-〇 is the residual deformation. A part of this residual deformation is plastic deformation, but the other part is elastic strain, and residual stress is formed in the part No. 5. ”
- The return of e mentioned above also impairs the fixation of the shading coil, but as the above-mentioned residual stress is resolved over time, the shading coil becomes loose. Relaxation of residual stress occurs by the repetition of these strikes, since each time the electromagnet operates, it strikes two sides of the armature or iron core. For this reason, the shaded coil 4. Not only does it become rattled, but the part 5 that had been turned inward comes back to life.
The magnetic pole surface, which had been polished to a flat surface, became uneven, and the armature was apparently in close contact, causing a whirring sound.
This roaring force further promotes the relaxation of the constant internal stress.

As mentioned above, although the caulking method is superior to the adhesive method, there are still problems. The present invention was made for the purpose of solving the above-mentioned problems in the caulking method. The present invention will be explained below with reference to Examples.

FIG. 2 shows an embodiment of the present invention, in which the steps proceed in the order of A, B, C, . . . . ■ is an iron core machined with the same model number as shown in Figure 1. Figure 2 Al Insert the 1-floor coil 4 into the groove 2 as shown, and the side of the shaded coil 4 as shown in Figure 2. into the recess 8, then hit the head side 5 of the iron core J to knock it down on the inside, as shown in Fig. 2C.
As shown in the second diagram, hit the negative side of the square-shape coil 4 to spread the coil horizontally.

This step is a feature of the present invention, and in the step of FIG. 2C,
The part 5 of iron core 1 is struck by X, returns by θ, and becomes x-e.
Shading roll 4 in the second drawing process
．． As a result of spreading out horizontally, the part 5 is pushed back by δ from e. This pushing back not only eliminates the internal stress that tends to return outward in the portion 5, but also generates an internal stress that causes the portion 5 to bend inward. For this reason, even if the internal stress is relieved over time, the part 5 will try to bend inward, so no loosening of the shading coil will occur, and the part 5 will actually bend inward because there is a shading coil. It is not possible to bend towards the direction. Therefore, if the two sides of the iron core 1 are polished flat after the step D as shown in FIG. 2E, there will be no risk of loss of flatness over time.

-1- In the example described above, the steps were performed in the order of A-E, or B
Step 2 is omitted, and the shading coil 4. is fitted into the groove 2. After that, the shading coil 4. is inserted into the groove 2. Then, the head side of the iron core 1 is hammered in the step C, and the coil 4. It is also possible to punch the upper surface of the iron core to push the coil into the recess 3 and push back the part 5 of the iron core.

As mentioned above, since the method of the present invention is a caulking method, there is no adverse effect on workers due to chemicals like when using adhesives, and compared to the conventional caulking method, the fixation of the shaded coil is better. It is complete and has extremely high reliability with no change over time.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the shape of the electromagnet core head in the process order according to conventional method 1, and FIG. 2 is a side view showing the shape of the electromagnet core head in the process order according to an embodiment of the present invention. E,
The progress of the process is shown in the order of C, D, and E. 1. Iron core, 2. Groove, 3. Recess, 4.・Shading coil.

Claims (1)

[Claims] The shading coil is fitted into the groove for fitting the shading coil in the electromagnet core, the outer circumference of the shading coil in the head of the electromagnet core is deformed inward by pressure, and then the two sides of the shading coil are pressurized to horizontally deform the cross section of the coil. A method for installing an electromagnetic shading coil characterized in that the outer periphery of the shading coil of an electromagnetic core is pushed back outward by expanding in the direction of the shading coil.