JPS58166704A - Resin molded coil and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide resin molded coils and their manufacturing method which makes it possible to reduce the number of blocks by sealing an insulating gas into void in conductor and hardening the injected resin. CONSTITUTION:A coil 4a provided with a wound conductor 2 and an insulating paper 3 that is inserted among the conductor layers and a sealing tube 7 that seals an insulating gas at 10-760Torr supplied from outside is molded with resin to form a resin molded coil. After resin injection into the coil 4a set in a metallic mold 8 is finished, an insulating gas at 10-760Torr is sealed from the sealing tube 7 by an outside cylinder, etc. After the sealing, the sealing tube 7 is closed with a plug 9 so as to prevent leakage of the insulating gas to outside. After this the resin is hardened. For the insulating gas SF6 or flon gas is used. The sealing tube 7 is formed by a pipe 7a that is made by forming a void in part of the conductor, and it is taken to outside through the terminal 10 of the resin molded coil connected to the metallic mold 8, and the opening in outside is provided with a plug.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin molded coil and a method for manufacturing the same, and more particularly to a resin molded coil and a method for manufacturing the same that are suitable for reducing the number of coil blocks.

Coils molded with resin used for electromagnetic windings, etc.
That is, conventional examples of resin molded coils are shown in FIG. 1 and FIG. Resin mold coil 1 is
*tP! of the wound conductor 2 and ! It is manufactured by injecting resin into an insulating paper 3 inserted between layers of a conductor 2 and a coil 4 made up of these conductors 2 and insulating paper 3 in a vacuum, and hardening the injected resin in the atmosphere. However, in the resin molded coil 1 manufactured in this manner, voids 6 were generated between the conductor 2 at nine portions sandwiched between the conductor 2 and the insulating paper 3. Insulating paper 3 is filled with an inorganic powder filler that is filled into the resin to prevent cracks from forming in the cured resin.
This is because it prevents the resin from impregnating the inside of the coil 4 due to clogging. By the way, this void 6
is low-pressure air where the product of the pressure and the gap length is approximately 6 Torr. As shown in FIG. 3, which shows the relationship with the starting voltage, the discharge starting voltage is as low as about 320V. For this reason, the void discharges at approximately 320V, making it unreliable in terms of insulation performance, and in order to prevent discharge at 320V, the voltage applied to the void must be set at 32V.
It needs to be 0V or less. For example, if the voltage at the flail of the coil is 4°V, winding it 8 times will result in 3.
Since the voltage is 20V, it is not possible to wind the coil more than 7 times, and therefore the coil must often have two or more blocks (see FIG. 1). Increased number of coil blocks 7J1
1 was not preferable because it required a long time to perform the work.

The present invention was made in view of the above points, and its purpose is to provide a resin mold 1 and a method for manufacturing the same, which make it possible to reduce the number of coil blocks.

That is, the present invention has a wound conductor, an insulating paper inserted between the layers of the wound conductor, an opening in the wound conductor, and a void between the conductors in which a non-R gas is applied from the outside.
OT Or r @ttm or more 76 G 'l'orr
- A resin-molded coil was formed by molding a coil with an encapsulation tube filled with resin. Then, the resin mold of the coil is injected into the coil in a vacuum, and the void between the conductors after injection is filled with insulating gas from the sealed tube to 760 Torr or more, and then injected. It is characterized by being made from cured resin.

The present invention will be explained below based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 4 to 8.

Note that parts that are the same as those in the prior art are given the same reference numerals, and their explanations will be omitted. In this embodiment, a nine-wound conductor 2, an insulating paper 3 inserted between the layers of the wound conductor 2, an opening in the wound conductor, and an external insulation in the void 6a between the conductors 2 are used. 10 Torr @1.2 or more 760 To
A resin mold 1 is formed by molding the coil 4a provided with the enclosing tube 7 enclosing rr@1111 and below with resin.9. Then, the resin mold of the coil 4a is injected into the coil 4a in a vacuum, and the insulating gas is injected into the void 6a between the conductors 2 after injection from the sealed tube 7 with "TOrr".
After enclosing 1 ml or more and 760'l'orr aglH or less, the injected resin was cured. That is, mold 8
After injection of resin into the coil 41 set in
The gas was sealed at Torr eg or more and 760 Torr e or less, and after the sealing, the sealing tube 7 was plugged with a stopper 9 to prevent the insulating gas from leaking to the outside. After doing this, the injected resin was cured (see Figures 6 and 7), but the insulating gas was
F or Freon gas was used. The enclosing tube 7 was formed by a pipe 7 & (see FIGS. 4 and 5) in which a part of the conductor 2 was made hollow. Note that the pipe 7a was taken out to the outside by passing it through the terminal 10 of the resin molded coil connected to the gold m, 8, and the external opening was plugged as described above. (See Figure 8).

By doing so, it is possible to obtain a resin molded coil and a method for manufacturing the same in which the number of blocks in the coil can be completely reduced by four breaths. That is, the void 6& in the coil 4a has a pressure of 10 Torr.■ or more than 760 Torr.
■Since the following SF or fluorocarbon gas is sealed, the horizontal axis shows the gas pressure! Take the product of J length and take the discharge starting voltage on the vertical axis to get SF.

As shown in Figure 9, which shows the relationship between the pressure of fluorocarbon gas and air and the discharge starting voltage, 760
At Torrs of 1 g or less, the discharge starting voltage of the Sr1-fluorocarbon gas is significantly higher than that of air, so the discharge starting voltage of the void 6m becomes much rougher than that of the conventional case. Therefore, the insulation performance is improved, the number of times the conductor 2 can be wound without causing discharge in the void 6a can be increased compared to the conventional method, and the number of turns of the coil 41 can be reduced.

Note that the reason why the insulating gas is filled in at a pressure of 760 Torr or less is because voids will occur in the mold resin layer if the insulating gas is filled in at a pressure of 760 Torr or more.

Furthermore, as the pressure increases, the discharge starting voltage also increases with air, but air cannot be used because it causes oxidation and deterioration of the resin molded coil.

@ Figure 10 shows another embodiment of the present invention. In this embodiment, the enclosed tube 7 is a wound pipe 7 wound between the conductors 2.
Formed in b. In this embodiment, the winding pipe 7b is inserted between the conductors 2.
, the current capacity of the conductor 2 is not reduced.

1. As described above, the present invention fills insulating gas into the void between conductors and hardens the injection resin after filling. This improves the discharge starting voltage of the void and prevents discharge from occurring. The number of times the conductor can be wound increases, making it possible to reduce the number of blocks in the coil, and it is possible to obtain a resin molded coil and a method for manufacturing the same in which the number of blocks in the coil is reduced.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional resin molded coil, W.
Figure 2 is a vertical cross-sectional view of the coil portion of a conventional resin molded coil, Figure 3 is a characteristic diagram showing the relationship between the air pressure in the void of the conventional resin molded coil and the discharge starting voltage, and Figure 4 is a diagram showing the relationship between the void air pressure and discharge starting voltage of the conventional resin molded coil. FIG. 5 is a longitudinal cross-sectional view of a coil portion of an embodiment of the molded coil, FIG. 5 is a perspective view of a conductor provided with a pipe of the same embodiment, and FIG. 6 is a resin molded state of an embodiment of the resin molded coil of the present invention. FIG. 7 is a vertical cross-sectional view of the mold showing the state of the coil, and FIG. 7 is a step-1 diagram showing the resin injection and curing step of an embodiment of the method for manufacturing a resin molded coil of the present invention. FIG. A vertical cross-sectional view of the vicinity of the terminal portion of one embodiment of the coil! Figure s9 is a characteristic diagram showing the relationship between insulating gas pressure and discharge starting voltage of one embodiment of the resin molded coil of the present invention, and Figure 10 is a characteristic diagram of the coil portion of another embodiment of the resin molded coil of the present invention. FIG. 2... Conductor, 3... Insulating paper, 4a... Coil, 6
m...Void, 7...Enclosed tube, 7a...Pie formed in the conductor Fig. 2 Sheep δ Country No. 4 Work No. 6 Difficulty 7 Closed sheep Fig. 9 Sea pressure η × Lock gate H Koji (-toshiji,) 16-ho 70 a

Claims (1)

[Claims] 1. A wound conductor, an insulating paper inserted between the eyebrows of the wound conductor, an opening in the wound conductor, and an external insulation in the void between the conductors. 10 Torr of sexual gas
A resin-molded coil characterized in that a coil is molded with resin, and a coil is provided with an encapsulated tube having a temperature of r@11@ or more and 760 Torr @11@ or less. ! +11. The resin molded coil according to claim 1, wherein the insulating gas is SF6 gas or fluorocarbon gas. & The resin molded coil according to claim 1, wherein the encapsulated tube is a pipe formed in the conductor. 4. The resin molded coil according to claim 1, wherein the encapsulating tube is a wound pipe formed by winding between the conductors. s A wound conductor, an IIA border paper interposed between the layers of the wound conductor, an opening in the conductor part with the spinning winding, and an insulating gas applied from the outside into the void between the conductors.
Resin is injected in a vacuum into a coil equipped with an encapsulated tube filled with Torreg or more and 760 Torr or less, and insulating gas is injected from the encapsulated tube into the void between the conductors after injection at a temperature of 10 Torr or more and 760 Torr or less. 15 Methods for assembling a resin molded coil characterized by curing the resin injected with the bond enclosed below.