JPS587677Y2 - magnetic shield plate - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic shield plate that shields magnetic flux leaking from an iron core, and aims to provide a magnetic shield plate that is easy to handle and use.

A conventional magnetic shield plate is made of a silicon steel plate 1 which is cut into strips in advance, bent into a rectangular frame shape, and welded together at both ends of the silicon steel plate 1, as shown in Fig. 1, and painted black. However, as shown in FIG. 2, this was placed around a laminated iron core 2 around which a coil was wound, and was fixed with coil covers 3 from both sides.

The magnetic shielding plate 1 having such a structure needs to be cut in advance to a size suitable for each core size and stacking thickness, formed into a frame shape, and after welding and joining, it must be hung one by one and painted. However, manufacturing is labor-intensive, and since it is attached to the outer periphery of the iron core 2, a gap inevitably occurs between the outer periphery of the iron core 2 and the inner surface of the magnetic shield plate 1, making it difficult to operate as a transformer. There was a drawback that sometimes vibration noise was generated.

The present invention eliminates the above-mentioned drawbacks of the prior art.

Embodiments of the present invention will be described below with reference to FIGS. 3 and 4.

4 is a magnetic thin plate made of an amorphous magnetic alloy whose main components are iron, nickel, and cobalt with a magnetic permeability of 10,000 or more, and which also contains boron, phosphorus, and silicon, and has a thickness of 0°01 to Q, l.
It is from nnm.

The thin plate 4 of this amorphous magnetic alloy is a material whose magnetic permeability hardly changes due to bending or other processing strains.

An insulating sheet 5 such as black printed or dyed paper or film is pasted on one side of the magnetic thin plate 4, and in some cases, an insulating sheet 6 such as the same paper or film is pasted on the other side as well. There is.

The magnetic shielding plate 7 having such a structure is wound into a roll as shown in FIG. 4A, pulled out by a predetermined amount when necessary, cut with a cutter 8, and then cut into a coil as shown in FIG. 4B. 9 is wound around the wound iron core 10, and the overlapped portions of the magnetic shield plates 7 are adhesively bonded.

If the insulating sheets 5 and 6 are thermoplastic films, they may be fused and bonded.

As the magnetic shielding plate of the present invention is constructed as described above, as long as the core thickness is the same, any change in the core outer diameter can be dealt with simply by changing the dimensions of the core to be pulled out from the roll. Since it can be processed into a shape that follows the iron core in the assembly workshop, inventory management of magnetic shield plates and product changeover are easy, and inventory management does not take up much space, which is extremely advantageous.

In addition, by laminating an insulating sheet that is thicker than the magnetic thin plate, and by wrapping the insulating sheet around the iron core as the inner surface, the bending stress applied to the magnetic thin plate is reduced, and processing distortion can be kept to a minimum. The decrease in magnetic permeability is almost eliminated.

Moreover, the insulating sheet acts as a cushioning material and can absorb vibration, and since the magnetic shield plate is wrapped around the iron core and incorporated, a gap is created between the iron core and the magnetic shield plate, causing vibration when operating as a transformer. The black printing and dyeing can be performed on the original roll without any noise caused by the process, making manufacturing extremely rational and improving the quality of the appearance.

Furthermore, since it uses a magnetic thin plate with high magnetic permeability, it can be made thin and can be bent by hand, and is protected by an insulating sheet, so it will not hurt your hands and is highly safe. It has great practical value.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional magnetic shield plate made of silicon steel plate, Figure 2 is a partially cutaway perspective view of a transformer showing the use of the magnetic shield plate, and Figure 3 is an implementation of the magnetic shield plate of the present invention. A sectional view showing an example, and FIGS. 4A and 4B are explanatory views showing a process of assembling the same magnetic shield plate into a transformer. 4... Magnetic thin plate, 5, 6... Insulating sheet.

Claims (3)

[Scope of utility model registration request] (1) Main ingredients are iron, nickel, cobalt, and boron. 0.01 to 0.1 of an amorphous magnetic alloy containing phosphorus and silicon
A magnetic shielding plate constructed by attaching an insulating sheet of paper or film to at least one side of a magnetic thin plate of 1.0 mm in diameter. (2) The magnetic shielding plate according to claim 1, which is a utility model, and is constructed by pasting insulating sheets on both sides of a magnetic thin plate. (3) Black printing as an insulating sheet attached to a magnetic thin plate,
A magnetic shielding plate according to claim 1, which is dyed black.