JPS5951733B2 - Manufacturing method of electromagnetic coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing electromagnetic coils used in transformers, reactors, etc.

Heat dissipation from electromagnetic coils involves the heat generated within the coil being mainly conducted through the coil conductor or insulation layer to reach one of the cooling ducts, where it is transferred to the cooling medium, the insulation. This is done by transmitting it to oil or air. Therefore, in an electromagnetic coil including multiple insulation layers, a method is used to reduce the average temperature of the coil by using a large number of duct pieces in order to transfer the heat generated within the conductor to an adjacent cooling duct. 1st
1 and 2 show the structure of a general electromagnetic coil. 1 is a coil bobbin, 2 is a coil conductor wound on the coil bobbin 1, 3 is an insulating layer provided between the winding layers of each coil conductor 2, and 4 is a duct piece made of a breath board or the like.

In general, in a coil having a structure including a large number of insulating layers as shown in FIGS. Wind a wire with a width equivalent to the included coil winding width.

This interlayer insulator 3 is often used as a laminated layer of thin insulators so that it easily conforms to the shape of the coil and prevents curling. In addition, in order to arrange the duct piece 4, the duct piece 4 is pasted on a thick insulating material such as a press board that has the circumference of the coil in advance, and is then wound around it, or the above-mentioned thin sheet insulating material A duct piece 4 is fixedly placed on the object 3 using cotton tape or adhesive tape such as polyester. Therefore, the interlayer insulator has the disadvantage that it is susceptible to wrinkles and curling, resulting in a decrease in insulation properties and variations in finished dimensions, and is susceptible to vibrations and electromagnetic mechanical forces.

Furthermore, different manual work is required to cut the insulation material for each layer according to the coil circumference and fix the duct piece with insulation material such as cotton tape, which makes the coil production time long and expensive. It was hot. The present invention has been made to eliminate the above-mentioned drawbacks, and one example of the present invention will be explained below with reference to the drawings.

In FIG. 3, first, the winding start part 2a of the coil conductor 2 is fixed at a predetermined position on the coil bobbin 1, and then the winding start part 7a-1 of the tape-shaped insulator 7 is fixed.

At this time, the coil bobbin 1 uses a holder 9 as shown in FIGS. 4a and 4b. That is, the holder 9 fixed to the differential shape 6
is set at a spaced apart position of the coil stack L including the end stuffing 7n of the coil, and has a fixing plate 10 on which an elastic branch, for example, a rubber branch, is glued on the coil output side.
As shown in FIG. 3, the fixed coil conductor 2a is wound in the direction of the arrow, and at the same time the tape-shaped insulator 7 is laminated to form the end insulator 7a. The conductor 2 is wound in sequence until it reaches a predetermined number of turns 2b.
On the other hand, the tape-shaped insulator 7 which has completed forming the tape-shaped insulator 7a is wound around the coil conductor 2 with a suitable wrap to form an interlayer insulator, and when the conductor 2 comes to the position 2a, Make sure to finish forming the first layer of interlayer insulator. Next, the duct pieces are arranged, and a tape-shaped insulator 7 is made by winding a set duct, etc., in which rod-shaped duct pieces are pasted at appropriate intervals on insulating paper, between the holding plates 10 attached to both sides of the coil bobbin 1. Attach by rolling it upwards. At this time, this set duct is held down from both sides by retaining plates 10, and is fixed so that it does not move when the coil conductor is wound. Next, the coil conductor 2 moves from the winding end portion 2b of the first layer to the second layer and is wound on the above-mentioned duct piece.Meanwhile, the tape-shaped insulator 7 is passed along the holding plate 10 into the duct. The pieces are laminated and wound to form the end stuffing 7b.

Thereafter, it is wound in the same manner as the first layer, and the outermost layer conductor 2 is 2n
When the conductor 2 reaches the position shown in FIG. 2, the conductor 2 is exposed, and then the end filling 7n is formed with a tape-shaped insulating material to complete the coil winding operation. The electromagnetic coil manufactured by the method described above can be manufactured with continuous winding by matching the number of turns of the coil conductor 2 and the number of turns of the tape-shaped insulator 7, and the end filling and the interlayer insulator are can be formed simultaneously with the winding of the coil conductor 2, and the duct piece can be easily set using the holder provided on the winding frame, and it is possible not only to prevent the end stuffing of the coil from collapsing, but also to prevent the coil from collapsing. It has the advantage of being able to keep the stack constant.

Furthermore, it is possible to automate the coil winding work, greatly shortening the process. In addition, since the interlayer insulation can be formed using a tape-shaped insulator, the tape-shaped insulator fits well along the circumferential surface of the coil, and does not cause wrinkles like conventional wide-width thin-sheet insulators. A good electromagnetic coil can be manufactured without blocking the cooling duct due to interlayer paper falling onto the duct surface.

[Brief explanation of the drawing]

1 and 2 are sectional views of conventional electromagnetic coils, FIG. 3 is a vertical sectional view of an example of an electromagnetic coil manufactured by the method of the present invention, and FIG. 4 a and b are sectional views of a conventional electromagnetic coil. FIG. 3 is a side view and a front sectional view showing the state of the electromagnetic coil during manufacture. 1... Coil bobbin, 2... Coil conductor, 3... Thin interlayer insulator, 4...
... Duct piece, 5,5' ... End filling, 6 ... Winding frame, 7 ... Tape-shaped insulator, 9 ... Holding Ingredients, 10... Fixed plate.

Claims (1)

[Claims] 1. When manufacturing a multilayer electromagnetic coil by winding a coil conductor to form one turn layer and simultaneously winding a tape-shaped insulator to form an interlayer insulator and an end insulator, the coil A method for producing an electromagnetic coil, in which a holder is provided at the end, the holder holds a duct piece inserted between layers, and prevents the end insulator from unwinding.