JPS6235249B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a transformer in which a putty-like heat transfer material kneaded with a liquid thermosetting resin, a reinforcing material, a filler, etc. is filled between an iron core and a coil, and then hardened, and provides a transformer with excellent heat dissipation. This is what I am trying to do. In a conventional transformer, as shown in Fig. 1, a coil 1 is surrounded by an insulator 2, and this is connected to an iron core 3.
It is configured by incorporating it into. In this configuration, in order to facilitate insertion of the coil 1 and prevent damage to the insulator 2 during insertion,
A gap 4 is formed between the insulator 2 and the iron core 3, but as shown in the table below, the thermal conductivity of air is extremely low, so the thermal resistance is increased by the gap 4 and the coil 1
There was a drawback that the heat generated in the coil 1 could not be quickly transferred to the iron core 3, resulting in a high temperature rise in the coil 1.

[Conventional example]

The laminated core is made of EI type silicon steel plates with a length of 97 mm and a width of 116 mm.The laminated core is 73.5 mm thick.The primary winding is 100 turns of 1.5φ copper wire, and the secondary winding is 0.37 mm.
The transformer was constructed by winding 2300 turns of φ copper wire. The temperature rise in the primary winding of this transformer was 120 days, and the temperature rise in the secondary side was 105 days. [Embodiment of the present invention] A laminated core of 95 mm in length and 114 mm in width, made by punching silicon steel plates into an EI shape, is laminated to a thickness of 73.5 mm.
A transformer is constructed by winding 100 turns of 1.5φ copper wire as the primary winding and 2300 turns of 0.37φ copper wire as the secondary winding, filling a putty-like heat transfer material 8 between the iron core and the coil. Configured. The temperature rise in the primary winding of this transformer was 115 degrees, and the temperature rise in the secondary winding was 93 degrees. Since the transformer of the present invention is constructed as described above, the space between the iron core and the coil is completely filled with a putty-like heat transfer material, so the Joule heat generated in the coil is quickly transferred to the iron core and the coil is heated. Temperature rise can be kept low, gaps of any shape can be reliably filled, and since it is a sheet-like, putty-like heat transfer material, it can be used as a special material when interposed between the coil and the iron core. It can be done without using any jigs and is easy to assemble. Moreover, the output capacity can be improved by applying the temperature rise suppression to the output current increase, and if the output capacity is kept constant, the winding wire diameter can be reduced or the iron core can be made smaller. Therefore, it has the advantage of reducing the amount of materials used and reducing costs, and is of great industrial value.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of a conventional transformer.
FIG. 2 is a temperature distribution diagram of the transformer, and FIG. 3 is a sectional view of the main parts of an embodiment of the transformer of the present invention.
FIG. 4 is an exploded perspective view of the main parts, FIG. 5 is a top view of a heat transfer material of another embodiment, and FIG. 6 is a temperature distribution diagram of the transformer. 5... Coil, 6... Insulating layer, 7... Iron core, 8
...Heat transfer material, 9...Resin film.

Claims (1)

[Claims] 1. In a transformer constructed by winding a coil around an EI-type, EE-type, UI-type, or UU-type laminated core or cut core, a liquid thermosetting liquid is placed between the core and the coil. A transformer characterized by being filled and hardened with a sheet-like heat transfer material in the form of a putty made by kneading a synthetic resin, an inorganic fibrous reinforcing material, and an inorganic filler. 2. The transformer according to claim 1, characterized in that the heat transfer material is a material covered with a resin film and packed in a bag.