JPS604570B2 - heat resistant insulated coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coil for a rotating electric machine or a transformer that is used in high temperature conditions of 300 to 600 o'clock.

Magnet wires currently in practical use and coils formed by molding and insulating them have a maximum operating temperature of no more than 250° C. due to restrictions on their insulators.

Inorganic insulators that can withstand higher temperatures are characterized by their workability,
Due to limitations in terms of workability and mechanical strength, such pure inorganic insulators have not been realized as magnet wires. According to our experimental results, the organic insulator is 300qo
I couldn't find anything that could withstand higher temperatures. The answer obtained as a result of the single material heating test is that nothing other than mica alone or inorganic insulators such as glass can withstand temperatures of 30,000 degrees Celsius or more, but it is possible to construct the insulation of the magnet wire with these inorganic insulating materials. is extremely difficult to process and cannot be put to practical use. As a solution to this problem, there is a method of forming a high-temperature coil by arranging a conductor inside a metal tube, filling it with insulating powder or a fluid object that can withstand high temperatures, and hardening the conductor. An example of this idea is a sheath wire. The sheathed wire uses stainless steel for the jacket tube and magnesium oxide as the insulating powder, and has flexibility and can withstand high temperatures of 100,000°C or more. Figure 1 shows the appearance of a chain winding coil for rotating electric machines.
As explained above, in the case of a sheath wire type coil, complicating the coil shape is structurally disadvantageous, so a chain winding type is used. 1 is the coil lead wire (crossover wire)
2 is a coil.

When making a coil with this sheathed wire, it has heat resistance, insulation,
All of them are satisfactory in terms of flexibility, but because the metallic tube of the outer sheath forms an electrical short circuit, they cannot be used in coils intended for electromagnetic induction. The present invention was made in order to eliminate the above-mentioned drawbacks, and by cutting one or several places of a metal jacket tube and joining and solidifying these parts with a high-temperature insulator such as ceramic, the jacket tube becomes electrically conductive. An object of the present invention is to provide an ultra-high temperature coil that satisfies the function of a coil without forming a short circuit in the coil, and also has flexibility necessary for coil wrapping work.

The present invention will be described below with reference to an embodiment shown in FIGS. 2 and 3.

Figure 2 shows one coil of the chain winding type according to the present invention. In the case of chain winding, the armature of a rotating electric machine can be made by preparing two or three types of coils with such a simple shape. . In FIG. 2, the metal sheaths on both ends 3, 3a of the coil are cut and solidified and molded with a heat-resistant insulator such as an inorganic adhesive or ceramic. By doing so, there is no electrical short circuit in the jacket tube and it can be used as a coil. FIG. 3 is a sectional view taken along line AA of the coil shown in FIG. Conductors 5 are placed in a metal coated tube 4 at appropriate intervals, and a heat-resistant insulating powder 6, such as magnesium oxide powder, is filled between them to form a coil. By cutting the metal jacketed tube at one or more places and insulatingly molding that part in this way, short circuits can be eliminated and the filling inside the tube can be prevented from flowing out. The reason why a metallic tube is used as the outer cover is that it has flexibility as a coil, can withstand high temperatures, has mechanical strength, and has good workability. The above is an example of a magnet wire and coil for rotating electric machines, but in the case of a transformer, circular or square coils are similarly made, and one of the metal tubes is
A high-temperature coil can be easily made by cutting and insulating molding at least a few points. As explained above, according to the present invention, conductors are arranged in a heat-resistant metal tube such as stainless steel, and these are filled and fixed together using heat-resistant insulating powder such as magnesium oxide, thereby achieving ultra-high temperatures. You can make insulated coils.

Electrical short circuits in the jacket tube are solved by cutting the jacket tube at one or more places and insulating molding. Such an ultra-high temperature coil could never be made with conventional organic insulators, and the filling in the tube does not have to be powder, but it goes without saying that the scope of the present invention also falls within the scope of the present invention even if the tube is filled with a fluid and then solidified. It is.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the appearance of a coil commonly called chain winding for rotating electric machines, FIG. 2 is a plan view of a heat-resistant insulated coil according to an embodiment of the present invention, and FIG.
It is an A sectional view. 1... Coil lead wire, (crossing wire), 2...
... Coil, 3, 3a ... Insulated joint of coil tube, 4 ... Coil outer metal tube, 5 ...
...Conductor (magnet wire), 6...Heat-resistant insulating powder filling. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a heat-resistant insulated coil consisting of a conductor for a magnet wire, an insulating powder or filler that can withstand high temperatures such as magnesium oxide, and a metal tube that stores these, the metal tube is cut at one or more places, A heat-resistant insulated coil characterized in that this part is electrically insulated and bonded by solidifying with a heat-resistant insulating material.