JPS5915050Y2 - Magnetic circuit parts - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a magnetic core for a magnetic circuit, and by imparting magic resistance without sacrificing its magnetic permeability, it effectively suppresses heat generation during operation and reduces power consumption. It is something.

Permalloy such as 45% Ni permalloy or 78% Ni permalloy, or electromagnetic soft iron is usually used as a material for magnetic circuit components such as the armature of the magnetic core.

These materials usually have a hardness of around Hv 200, but because they are annealed at high temperatures before use,
The hardness during use drops to around Hv 100.

If the hardness decreases in this way, when the contacting and separating parts of the magnetic core, that is, the opposing armatures repeatedly contact and separate, the opposing surfaces will wear out and become uneven due to the impact they receive each time. Become.

If we look at this as a magnetic circuit, it means that a gap is effectively created, and the attraction force when the fixed movable pieces are attracted and in contact with each other is reduced.

Normally, after the movable piece is attracted, the current value is lowered than when it was attracted, to prevent heat generation and avoid power loss.

However, as mentioned above, when the adsorption force decreases due to wear of the contact and separation opposing surfaces (that is, the efficiency of the magnetic attraction force deteriorates),
Because it is necessary to maintain this state even after adsorption, a high current value must be maintained, resulting in problems such as heat generation and increased power consumption.

As a countermeasure, it is possible to attach a highly hard chromium plating layer, tungsten carbide, titanium carbide, or other layer to the opposing surfaces, but these hard materials generally have low magnetic permeability.

Therefore, when viewed as a magnetic circuit, the effective air gap caused by the occurrence of unevenness due to wear is reduced, but the effective air gap caused by low magnetic permeability is formed, and the attraction force is reduced.

This idea attempts to prevent an increase in magnetic resistance when using a magnetic circuit due to the generation of an effective gap due to low wear resistance and the generation of an effective gap due to low magnetic permeability. The base of at least one of the pair of armatures having opposing surfaces is 45 mm.
It is made of one material selected from the group consisting of permalloy, 787, monomalloy, and electromagnetic soft iron, and the opposing surface is made of Fe-Al-3i alloy, Fe-Al alloy, silicon iron, high hardness permalloy, and soft iron. Forming a surface layer made of one type of hard high magnetic permeability material selected from the group consisting of magnetic ferrite,
Moreover, the thickness of the surface layer is set in the range of 0.2 μm to 0.5 mm.

FIG. 1 shows an example of the implementation of this invention, in which a magnetic pole 2a of an armature 2 facing a magnetic pole 1a of an iron core 1 is brought into contact with and separated from the magnetic pole 2a of the iron core 1, thereby activating a contact 3 to perform a relay operation.

In this invention, a hard high permeability material layer as described above is formed on at least one of these magnetic poles 1a and 2a.

The material layer H may be formed on one surface of the permalloy portion P as shown in FIG. 2A, or may be formed to wrap around the permalloy portion P as shown in FIG. 2B. An appropriate forming method can be adopted accordingly.

The thickness of the material layer is 0.2 for small relays for communications.
It may be about μm, but for large relays for high power, Q, 5mm.
The thickness is preferably in the range of 10 to 100 μm.

If the thickness is less than 0.2 μm, the effect of forming such a material layer will not be recognized at all, and if it is made more than 0.5 mm, the cost will only increase and the effect will not increase.

As a material with high hardness and high magnetic permeability, F such as Sendust is used.
FeA1 alloy such as e-5i-A1 alloy, Alperm,
Silicon iron, high hardness permalloy, and soft magnetic ferrite can be used.

For forming these material layers, plating, thermal spraying, sputtering, vapor deposition, etc. are appropriately selected in consideration of material selection, purpose, heat treatment method, and combination with base material.

Example A simulated relay as shown in Figure 3 was fabricated.

That is, a coil 12 is wound around a yoke 11 made of permalloy, and an armature 14 having a spring 13 attached thereto is placed opposite to the coil 12.

And 0.1.0 on the armature facing surface of the yoke 11.
A 2.0.5.0.7 mm Sendust yoke with a chip of the same shape glued thereto and a Permalloy-only yoke were prepared.

When the current required for armature adsorption was measured, a relationship as shown in FIG. 4 was observed between the number of adsorption times and the adsorption current value.

(The device was driven with a constant current of 250 mA except for the fixed time on the suction side.) As is clear from FIG. 4, if this invention is not used, the current required for suction increases rapidly after about 100 suctions.

When the thickness of the material layer is about 0.1 m, the adsorption current increases from about the 10,000th time, but when it becomes 0.2 mm or more, the adsorption current does not increase at all even if the number of adsorption increases.

It was also confirmed that the effect did not increase at all even when the thickness exceeded 9.5 mm.

As is clear from the above description, according to this invention, a core with high hardness can be obtained without impairing magnetic permeability, and therefore a magnetic core for a magnetic circuit with a small increase in magnetic resistance during operation can be obtained.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing an example of the object to which this invention is applied, Figure 2
Figures A and B are cross-sectional views showing the method of forming the hard material layer, Figure 3 is a side view of a simulated relay used to confirm the effectiveness of the invention, and Figure 4 is a graph showing the results. 1... Iron core, 2... Armature, 3...
...Contact, H...Material layer, 1a, 2a...
...Magnetic pole, P... Permalloy part.

Claims (1)

[Claims for Utility Model Registration] At least one of a pair of armatures having opposing surfaces so as to operate toward and away from each other has a base made of a material selected from the group consisting of 45 permalloy, 78 permalloy, and electromagnetic soft iron. The opposing surface is made of one material selected from the group consisting of Fe-Al-3i alloy, Fe-Al alloy, silicon iron, high hardness permalloy, and soft magnetic ferrite. A surface layer made of a hard, high magnetic permeability material is formed, and the thickness of the surface layer is 0.
A magnetic core for a magnetic circuit, characterized in that the core is in the range of 2 μm to 0.5 mm.