JPS5824420Y2 - transformer - Google Patents

Description

[Detailed description of the invention] The present invention relates to a transformer in which a magnetic core wrapped with a coil is housed in a magnetic metal case, and the metal case and the circumferential surface of the magnetic core are bonded by an electrically conductive and highly thermally conductive binder. , which is intended to provide an excellent magnetic shielding effect and excellent heat dissipation.

In general, the electrical capacity of a transformer is regulated by copper loss due to the resistance of the internal windings, and temperature rise in the transformer due to iron loss such as hysteresis loss and eddy current loss due to the magnetic field applied to the magnetic core. In order to increase efficiency, we use insulating materials that can withstand higher temperatures, and we use 5-winding magnetic materials that have less loss.

In conventional transformers, insulating casting material has been used to secure the magnetic core wrapped around the metal case and coil in order to maintain the insulation properties of the windings and prevent insulation deterioration due to moisture absorption. However, it was not possible to obtain sufficiently high efficiency due to problems in terms of performance and magnetic shielding effect.

For this reason, it has been revealed that a casting material mixed with an inorganic insulating material is used to improve thermal conductivity, but this has not resulted in a sufficiently satisfactory effect.

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. 1 to 4.

1 is an EI made of silicon steel plate or ferrite magnetic material, etc.
The transformer body is constructed by incorporating a primary coil 3 and a secondary coil 4 wound around a coil bobbin 2 into the magnetic core 1.

The main body of the transformer is formed by drawing a magnetic material such as an iron plate with an opening on one side, and is housed in a metal case 5 whose surface has been subjected to surface treatment such as anti-corrosion treatment.

Inward protrusions 6 are provided on both sides of the metal case 5 at portions corresponding to the width of the magnetic core 1, and the transformer body is positioned and assembled by press-fitting the magnetic core 1 between the protrusions 6. It will be done.

A high thermal conductivity of 0.1 to 0.9/cm2/℃ or more is provided between the periphery of the magnetic core 1 and the metal case 5 using a binder made of powder such as aluminum or copper as the main component or a resin binder. A conductive binder 7 is interposed therebetween for bonding.

It should be noted that the binder 7 does not need to be applied to the entire circumferential surface of the magnetic core 1, and may be applied to about 1 to 100 ml of the entire circumferential surface in consideration of workability.

Furthermore, in order to more firmly fix the transformer main body to the metal case 5, the space in the metal case 5 can be filled with an insulating casting material 8.

This insulating casting material 8 is only used to firmly fix the transformer body to the metal case 5.The insulating casting material 8 is used to prevent moisture absorption in the coil section due to the insulating performance of the coil section itself. Insulation properties that do not adversely affect the insulation performance of the coil section are required.

Moreover, this insulating casting material 8 may be cast to cover the coil portion of the transformer main body, if necessary.

A cover plate 1 made of a magnetic metal plate has a through hole 10 at the opening of the metal case 5 to draw out the lead wire 9 from the coil section.
1 are combined.

Since the transformer of the present invention is configured as described above, the metal case and the magnetic core are electrically and thermally coupled with almost the same electrical resistance and thermal conductivity as metal, so the transformer body is electrically and thermally connected to
It is magnetically shielded and has less leakage magnetic flux,
The metal case effectively acts on the heat dissipation of the transformer body, providing excellent heat dissipation, allowing for smaller size and weight reduction, and high efficiency.
It has great practical value.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the transformer of the present invention;
The figure is a vertical cross-sectional view of the same assembly in progress, Figure 3 is a cross-sectional view of the same, and Figure 4 is a cross-sectional view of the same.
The figure is a cutaway perspective view of the main part of the transformer main body. 1... Magnetic core, 2... Coil bobbin, 3
・・・・・・−Secondary coil, 4・・・・・・Secondary coil,
5...Metal case, 6...Protrusion, 7.
...Binding agent, 8...Insulating casting material, 9.
...Leader line, 10...Through hole, 11...
...Lid plate.

Claims (3)

[Scope of utility model registration request] (1) In a transformer constructed by housing a transformer main body, which is constructed by incorporating a coil bobbin in which primary and secondary coils are wound around an outer iron magnetic core, in a metal case, the metal case made of magnetic material and A transformer in which the transformer body is fixed to a metal case with a binder having high thermal conductivity and electrical conductivity interposed between the magnetic core of the transformer body and the magnetic core of the transformer body to be housed. (2) The transformer according to claim 1, which is a utility model, and includes protrusions for positioning the magnetic core on both side walls of the metal case. (3) The transformer according to claim 1, which is a registered utility model and is formed by casting an insulating casting material into the space of a metal case housing the transformer body.