JPS61139013A - Transformer - Google Patents

Abstract

PURPOSE:To prevent a beat noise and to dispense with frame of a transformer with which a magnetic shield plate is covered, by mechanically fixing an iron core and a magnetic shield plate. CONSTITUTION:The circumference of an iron core 2 on whose center the coil 1 is wound is covered with a magnetic field plate 6. The fixture for welding 7 is attached on the bottom of the iron core 2, and they are applied pressure from the direction of the arrow A. Then, the iron core 2 and the magnetic shield plate 6 are fixed on the fixture for welding 7 by welding the position where the iron core 2, magnetic shield plate 6, and the mixture for welding 7 contact each other. Further, to preventing the excitation of the magnetic shield plate 6, the section b of the magnetic shield is spot-welded on the iron core 2 from upside, and the section c of the magnetic shield 6 is spot-welded on the iron core 2 with its end plane so as to fix the magnetic shield plate 6 on the iron core 2, thereby preventing the beat noise due to the excitation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transformer constructed by covering an iron core around which a coil is wound with a magnetic shield plate.

2. Description of the Related Art Conventionally, this type of transformer has been constructed as shown in FIGS. 4 and 5. That is, a magnetic shielding plate 3 made of a silicon steel plate or the like is placed around the iron core 2 with the coil 1 wound around the middle leg, and a transformer frame 4 is placed on top of the iron core 2 and the magnetic shielding plate 3. and plate 5
It was configured to be fixed to.

Problems to be Solved by the Invention However, there is no mechanical fixation between the iron core 2 and the magnetic shield plate 3;
was excited, producing a hum. Furthermore, in order to attach the magnetic shield plate 3 to the iron core 2, it was necessary to cover it with the transformer frame 4 and fix it to the plate 5.

The present invention eliminates the above-mentioned conventional drawbacks, and reduces and prevents the beat that occurs between the iron core and the magnetic shield plate, and also reduces the cost of fixing the magnetic shield plate to the iron core. The object of the present invention is to provide a transformer that can be easily implemented.

Means for Solving the Problem In order to solve this problem, the present invention covers the outer periphery of the iron core with a U-shaped magnetic shield plate with each side curved inward, and the iron core is It has a structure in which it is fixed by spot welding to the core.

Function: With this configuration, the iron core and the magnetic shield plate are mechanically fixed, which is effective in preventing humming noise and eliminates the need for the transformer frame that covers the magnetic shield plate. Therefore, it has the advantage of being low cost and easy to implement.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In FIGS. 4 to 3, the same numbers as in FIGS. 4 and 5 showing the conventional transformer device are given the same numbers, and the explanation thereof will be omitted.

Reference numeral 6 designates a magnetic shield plate in which each surface of the U-shaped magnetic shield plate 3 is provided with springback in the direction of the arrow. Then, as shown in FIG. 2, the magnetic shielding plate 6 is placed over the outer circumference of the iron core 2 with the coil 1 wound around the middle leg, and the welding fitting 7 is attached to the bottom of the iron core 2, as shown in FIG. Weld the iron core 2 and magnetic shield plate 6 together by combining them as shown in the figure, applying pressure from the direction of the arrow, and welding the part marked a where the iron core 2, magnetic shield plate 6, and welding fitting 7 contact each other. Fix it to the mounting bracket 7. Furthermore, in order to prevent the vibration isolation of the magnetic shield plate 6, b of the magnetic shield plate 6 in FIG.
Place the marked part on iron core 2 from above.

In addition, the C-marked part of the magnetic shield plate 6 is spot welded to the iron core 2 at the end face, and the magnetic shield plate 6 is fixed to the iron core 2.
Prevents humming noise due to excitation. A plurality of spot welds as indicated by the Naori mark and the C mark are required, and the more spot welds there are, the higher the degree of prevention of whining noise will be.

Effects of the Invention As described above, in the transformer device of the present invention, the U-shaped magnetic shield plate is curved inward on each side and directly welded to the iron core, so that the space between the iron core of the transformer and the magnetic shield plate is is fixed mechanically, which prevents the humming noise generated between them, and eliminates the need for a transformer that covers the magnetic shield plate. The value is extremely high.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a magnetic shield plate used in a transformer device of the present invention, Fig. 2 is a block diagram of a transformer device according to an embodiment of the present invention, and Fig. 3 is a perspective view for explaining an example of a welding point. 4 is a perspective view showing a conventional transformer device,
FIG. 5 is a diagram showing its configuration. DESCRIPTION OF SYMBOLS 1... Coil, 2... Iron core, 6... Magnetic shield plate, 7... Welding mounting bracket, a... Welding, b, c...
...Spot welding agent Yoshihiro Morimoto Fig. 2 Fig. 1 / -m-Coil 2----- aIa+ t----Ikkyou side→de inferior ( )6 O----S main-t 4J Reference Figure 3 Figure 4 Figure S

Claims (1)

[Claims] 1. A transformer in which a wound coil is attached to the middle leg of an iron core, and the outer periphery of the iron core is covered with a U-shaped magnetic shielding plate with each side curved inward. A transformer fixed with an iron core and spot welding.