JPS58107608A - Mold coil - Google Patents

Abstract

PURPOSE:To simplify processes by forming a rectangular coil with aluminium die casting as a high voltage and heavy current magnetic coil and by employing a structure that such coil is insulated by casting using casting resin. CONSTITUTION:A coil wire is integratingly maunfactured with aluminium die cast 8 and external side is molded by casting resin 2. A loop can be freely formed with a profile for moldng at the time of casitng by manufacturing it with aluminium die casting. Wire insulation and interlayer insulation can be realized simultaneously by moding the entrire part of aluminium die casting coil 8 with the casting resin and the processings such as wire insulation, interlayer insulation and solid winding are no longer required.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loop-shaped cast electromagnetic coil used at high voltages and high currents.

Casting with polyester resin or epoxy resin is widely used for insulators, small transformers, small electric motors, etc.

Resin casting can provide mechanical retention and electrical insulation at the same time.
It has the advantage of not requiring detailed manual work and can produce identical quality products with less man-hours, and is especially suitable for large-scale equipment that requires mass production. Various applications are being considered. An example of this is propulsion and guide coils for maglev trains. This is approximately +1000mm
...It is a rectangular, air-core, high-voltage, large-current electromagnetic coil measuring 2000m+. First, the internal structure of a conventional propulsion guide coil will be explained with reference to FIGS. 1 and 2. FIG. 1 shows a longitudinal cross-sectional view, and FIG. 2 shows a cross-sectional view. The propulsion guide coil is made by winding a coil cable l in a loop shape and connecting it to a feeding cable 4 through an opening 3, and placing it in a molded resin 2. and mold. Variable AC large current (approximately 1000
A) is applied through the senior cable 4 to generate a magnetomotive force of several 1 uT in the loop-shaped coil. The voltage is IQNV~
The voltage is about 30kV. Conventionally, as a material for the coil wire 1, a rectangular aluminum wire with wire insulation 5 has been used.

In order to form a coil into a loop shape as shown in Fig. 1, a winding die is used to wrap interlayer insulating paper 6 (mainly polyamide paper), but a large current of about 1000 A is passed through the coil. Therefore, due to the four current density, the coil element il
The cross-sectional area of l is required to be about 45 stripes×15n. It is difficult to form rectangular aluminum wire with such a large cross-sectional area into a loop shape using a winding die, so it is necessary to harden it with glass tape, etc. so that the coil does not become crooked when casting. There is a need to apply 17, but this solid volume 7 is 10
The entire circumference of the coil that can reach 00fl 2000fi (5 in total)
oooas) is inefficient and unsuitable for mass production.

The present invention makes it possible to extremely easily manufacture a cast coil, which conventionally requires a large number of man-hours.

) An embodiment of the present invention will be described below based on the drawings.
／ゝ、I will clarify. As shown in Fig. 3, the structure is made by integrally manufacturing coiled wires using aluminum die-casting 8.

The outside is molded with casting resin 2.

If manufactured by aluminum die-casting, the loop shape can be freely configured depending on the mold during casting.

- It is possible to integrally cast up to the raised part 3 (same shape as in Fig. 1, not shown). The wire insulation 5 and the interlayer insulation 6- can be done at the same time when molding the entire aluminum die-cast coil 8 with casting resin.
There is no need for the conventional wire insulation 5, interlayer insulation 6, tight winding 7, and other treatments.

According to the present invention, the following effects can be expected compared to conventional loop-shaped cast coils.

(1) Since the loop shape can be freely selected depending on the casting type, unlike the conventional loop shape, there is no need for an arcuate part of the corner, and it can be configured inside the refrigerator. This increases the effective area of the interlinkage magnetic flux9, which improves the efficiency of the linear synchronous motor that propulsifies magnetic levitation trains.

(It) It is very suitable for Owashi production because it does not require any man-hours for coil wire winding, insulation processing such as wire insulation, interlayer insulation, and tight winding.

(2)) After the conventional method of winding rectangular aluminum wire and casting molding, small voids 11i (voids) remain between the coil wires and between the layers, and the structure of the corona partial discharge is very poor. Because it is simple, almost no voids remain even after cast molding, making it possible to provide a highly reliable insulation film.

4. Brief explanation of the drawings Figure 2 of the proposed coil.

1... Coil element - 2... Casting resin 6... Interlayer insulation 8... Aluminum die-cast coil 1L... Partial arc shape of corner.

ν' (7311) Agent: Patent Attorney Noriyuki Chika (and 1 others)
Name) Yeah Figure 3 R

Claims (1)

[Claims] For high-voltage, large-current electromagnetic coils, the coil is formed into a rectangular shape by die-casting aluminum, and then insulated by Yasting Tomonaka using casting resin.