JPS598327Y2 - dc electromagnet - Google Patents

Description

[Detailed description of the invention] This invention relates to a DC electromagnet, and aims to improve its durability.
And it can be manufactured at low cost.

An example of a conventional DC electromagnet is explained with reference to FIGS. 1 and 2. 1 is a yoke plate, 2 is a fixed iron core fixed to this yoke plate 1, and 3 is a coil attached around the fixed iron core 2 with a retaining ring 4. In the yoke plate 1, a pair of through holes 5a of the movable core 5 are loosely fitted into a pair of protrusions 1a protruding from the upper part of the yoke plate 1, so that the movable core 5 can be positioned at a position where it contacts the fixed core 2 and from there. It is installed so that it can swing within the required range between distant locations.

Further, a spring 6 is stretched between the movable iron core 5 and the yoke plate 1, and the tensile force of this spring 6 normally holds the movable iron core 5 at a position away from the fixed iron core 2. Furthermore, the movable iron core 5 A certain residial 7 made of a non-magnetic material is fixed to the part that contacts the fixed iron core 2.

Therefore, if the coil 3 is energized, the movable core 5 will be attracted to the fixed core 2, and if the coil 3 is de-energized, the movable core 5 will be attracted to the fixed core 2.
is returned to its original separated position by the tension of the spring 6.

At this time, the range gear 7 fixed to the movable core 5 has a function of preventing the movable core 5 from remaining attracted to the fixed core 2 due to the attractive force due to residual magnetism, and ensuring the reliable return of the movable core 5. has.

However, in the above-mentioned conventional device in which the residial 7 is fixed to the movable core 5, the residial 7 of the desired shape is punched out of a non-magnetic material such as a copper or copper alloy plate, and the punched residial is then inserted into the movable core 5. It requires work to fix it in a predetermined position by brazing or spot welding, etc., and it is unstable to fix it in an accurate position with brazing, on the other hand, with spot welding, the resigial 7 made of copper or copper alloy and the movable iron core 5 made of iron are used. There was a drawback that the reliability of welding with the residial 7 was low, and furthermore, there was a risk that the residial 7 would fall off with any fixing means.

Furthermore, as a residial 7, an insulating film is attached to the movable iron core 5.
There are also adhesives that adhere to the surface, but as mentioned above, there is a risk of peeling off and falling off, so this could not be desirable.

In view of these drawbacks, the present invention consists of a movable iron core made of a clad plate made of magnetic and non-magnetic materials, thereby eliminating the need for punching and fixing work of the resi- tals, and reducing the risk of them falling off. This provides a DC electromagnet with no leakage.

Below, one embodiment of the present invention will be explained based on the drawings.
In the figures, 1 is a yoke plate, 2 is a fixed iron core, 3 is a coil, and 4 is a retaining ring, which are arranged in the same way as in the conventional one.

8 is a movable iron core obtained by punching a clad plate into a predetermined shape,
In this embodiment, the above-mentioned clad plate uses an iron plate 9 which is a magnetic material as a base material, a copper plate 10 which is a non-magnetic material as a cladding material, and clads the copper plate 10 on the front and back surfaces of the iron plate 9. is used.

Note that 8a is a hole corresponding to the above-mentioned through hole 5a, and the movable iron core 8
is attached to the yoke plate 1 in the same manner as before, and when a clad plate in which only one side of the iron plate 9 is clad with a copper plate 10 is used, the copper plate 10 is attached so as to be on the fixed iron core 2 side.

Further, as the magnetic material and the non-magnetic frame material, it is of course possible to use appropriate materials other than the above-mentioned iron and copper.

As described above, in the present invention, the movable iron core is constructed from a clad plate made of magnetic and non-magnetic materials, so it can obtain the same function as the conventional movable iron core with a fixed residial. Furthermore, compared to conventional products in which the residial is fixed, it can be manufactured at a low cost because it does not require punching or fixing of the residial, and there is no risk of it falling off or mismatching the mounting position, so it is more durable. An excellent effect of improving stability can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of a conventional device, Fig. 2 is a perspective view of a conventional movable iron core, Fig. 3 is a side view showing an embodiment of the present invention, and Fig. 4 is a movable iron core according to the present invention. FIG. 2... Fixed iron core, 3... Coil, 8...
...Movable iron core, 9...Iron plate, 10...
...Copper plate.

Claims (2)

[Scope of utility model registration request] (1) In a DC electromagnet comprising a coil, its fixed core, and a movable core that is attracted to the fixed core when the coil is energized, the movable core body is made of a magnetic material and a non-magnetic material, and the movable core body is made of a magnetic material and a non-magnetic material, and A DC electromagnet characterized in that it is constructed of a clad plate with non-magnetic material sides facing each other on opposing sides. (2) The DC electromagnet according to claim 1, wherein the magnetic material is iron and the non-magnetic material is copper.