JPS6030110A - Transformer winding - Google Patents

Abstract

PURPOSE:To obtain a small and light-weight transformer with alternately arranged rectangular flat windings which produce little electromagnetic mechanical force applied to the radial direction by a method wherein a wedge-shape filler which has contact with a transition part and a conductor wound outside the transition part is inserted and the transition part and the filler have contact with an insulator. CONSTITUTION:An insulated conductor 22 is wound into three turns laminated to the radial direction starting from a transition part 23 and ending at lead 24 to form a rectangular flat coil 2. The transition part 23 is so arranged to touch the inside circumference of the coil and bent to the axial direction to be guided to another rectangular flat coil which makes a pair with the former one. A filler 25 which fills the space formed at the transition part is formed into a wedge shape as shown by a shaded part in the figure and the conductor 22, which is wound in one turn starting from the transition part 23, is pushed outside along the slope of the wedge of the filler 25 and laminated outside the transition part 23 at the part (a). With this constitution, the shift of the center of magnetism and the range along the circumferencial direction within which the shift is produced are both reduced and an electromagnetic mechanical force which is applied to the radial direction on the lead side of the rectangular flat coil is reduced.

Description

[Detailed Description of the Invention] [E Technique of the Invention f'1. J minute 11'j') Present invention i
1. High If winding and low pressure winding made of multiple rectangular plate-shaped coils! The 479 structure of the transformer windings is related to the 479 structure of the transformer windings.

[Conventional technology and melting point]

High masterpiece +! In an external iron type transformer in which windings 4 and low voltage windings are arranged alternately in the axial direction, it is intended to minimize the electromagnetic mechanical force acting on mutual opening of the windings.

Figure 1 is a cross-sectional view of a transformer in which high-voltage windings and a plurality of low-voltage windings are arranged alternately, where la and 1b are the main legs and yoke parts of the outer iron core 1 having rectangular cross sections, and 1c is the main leg part and yoke part. This is an insulating tube attached to the B'11 portion 1a. For example, three rectangular plate-shaped coils are connected in series using high-voltage windings, and their starting and ending ends are connected to a pair of positive terminals 4aK through an opening lead 5a.

Heads 3a+3bl 3c and 3d are a plurality of low-voltage windings, each formed as a rectangular plate-shaped coil, and the starting and ending ends of each winding are connected to the low-voltage terminal 4b through a pair of lead wires 5bK. has been done. In the illustrated example, low voltage windings 3a+3b and 3e+3d are arranged on both sides in the axial direction with the high voltage winding 2 in between, forming so-called alternately arranged windings. Further, a barrier 6 having a duct spacer is interposed between each winding or each coil to form a cooling duct between each coil and maintain insulation between the coils. Also, windings 2 and 3 are attached to the legs of stacked core 1.
The contents of the transformer into which the is inserted are divided into tanks 7a and 7.
b through the spacer piece 8, and is assembled so that a predetermined fastening load is applied in the axial direction of the winding.

By the way, in the windings arranged alternately as described above, the electromagnetic mechanical force acting on the mutual windings due to the short-circuit current is mainly in the stacking direction of the rectangular plate-shaped coils (hereinafter referred to as the axial direction following the coaxial arrangement windings). The winding width of the coil (
It does not work in the W direction in the figure (hereinafter referred to as the radial direction following the coaxially arranged winding). Therefore, it is not necessary to make the coil circular, and both the high and low voltage windings are formed into rectangular plate-shaped coils. However, as mentioned above, the electromagnetic mechanical force is
In order for each rectangular plate coil to have a symmetrical ampere-turn distribution in the width W direction, the geometrical position Mo of the magnetic center must be at the same position in the axial direction for each rectangular plate coil. . In other words, in a coil in which an insulated conductor is wound into a rectangular plate shape, the center position of the coil in the width direction W coincides with the magnetic center position, so the center position of each coil in the width direction coincides with each other in the axial direction of the coil. By arranging the windings so that they are in the same position, the above conditions can be met. However, in areas where there are crossover IPs and opening leads 5a and 5b for connecting rectangular plate-shaped coils, the above-mentioned sales problems are mainly due to differences in the conductor cross-sectional analysis of the high and low voltage windings. In many cases, the conditions are not satisfied, and radial electromagnetic mechanical force is generated in this part.

FIGS. 2 and 3 are conceptual diagrams of a conventional rectangular plate coil. In Fig. 2, it is a rectangular plate-shaped coil in which an insulated conductor of 3i-j+thread is wound in a rectangular shape, for example, 3 turns. 5 is provided. Insulation v at the transition part 9
j Since the covered conductor is bent in the axial direction of the coil and pulled out in the axial direction, a hole is created in the hatched area in the figure. Therefore, a filling 10 made of an insulating material is interposed in this part to make the coil 3
The inner circumferential surface of the core is formed so as to be in close contact with the leg portion 1a of the iron core covered with the insulator IC, as shown in FIG. The magnetic 4+>position Mo of the rectangular plate-shaped coil 3 formed as shown in FIG.
In the circumferential portions of the coil such as A, B, C, and I) where the filler 10 is not interposed, the position 4 coincides with the center position of the coil width, that is, the same distance from the inner circumferential surface of the coil 3. In the partial pressure where the filling lO is interposed, the position E1 shifted outward by the thickness tl of the filling becomes the magnetic center MO, and the other A.

The position of the magnetic center is different from the positions outside B, C, and D.

Furthermore, Fig. 3 shows a rectangular plate-shaped coil in which three parallel insulated conductors are stacked on top of each other in the axial direction of the coil 3 and wound in two turns, and the thickness t2 of the stuffing lO is the thickness of three conductors. Therefore, the deviation of the position of the magnetic center Mo at the F position where the filling 10 is interposed becomes extremely large.

In general, high voltage windings have conductor breaks i? Since ri is small and the thickness of the filling material t is also small, the displacement of the position of the magnetic center MO is small. However, low-voltage windings are often wound in parallel in the radial direction of the parallel conductor tube, as shown in Figure 3.
There is a large displacement in the position of O, and the position of the magnetic center Mo changes in a complicated manner on one side where there is a transition part of the quadrilateral coil.

Therefore, a radial electromagnetic mechanical force is generated in the rectangular plate coil 3 in response to the deviation of the magnetic centers of both the high and low windings. In addition, when the low voltage winding is a twin winding consisting of a pair of rectangular plate coils, a radial magnetic mechanical force also acts between the two-dimensional coils. However, since rectangular plate-shaped coils are more easily deformed by mechanical force in the radial direction than disc-shaped coils, the conventional structure has seven measures to suppress radial deformation of rectangular plate-shaped coils. The drawback was that the measures were large-scale.

(Object of the Invention) The present invention has been made in view of the above-mentioned situation.
(The purpose is to provide a small and lightweight transformer equipped with alternating rectangular plate-shaped seams that generate a small amount of electromagnetic (η) mechanical force.

[Key points of the invention]

According to Proposal 1, the above-mentioned purpose is to shift the transition part provided on the lead side of the low-voltage winding consisting of a rectangular plate-shaped twin coil in the winding direction when there is a parallel conductor. Each of the transition portions is arranged at a position in contact with the inner circumferential surface of the winding, and the padding interposed in the transition portion is formed into a wedge shape with a maximum radial warp equal to the thickness of the insulated conductor, This is achieved by configuring the coil width on the output lead side to be approximately equal to the product of the thickness of the insulated conductor, the number of parallel conductors, and the number of turns of the coil to reduce the radial positional deviation of the magnetic center Mo. Ta.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 4 is a plan view of a rectangular plate-shaped coil showing an embodiment of the present invention. In the figure, a rectangular plate-shaped coil 2]): j, one strip of insulation 'P, covered conductor 22, with one starting end at the crossing portion 23 and one end at one end 24, wrapped three times so as to overlap in the radial direction, The transition portion 231-j is in contact with the inner peripheral surface of the coil].

The coil 21 is bent in the axial direction of the coil 21 and guided to the other pair of rectangular plate coils as described below.

Further, the filling 25 inserted to fill the hole formed in the transition part is formed in a wedge shape as shown in the hatch part in the figure.
The conductor 2 is wound approximately in one turn with the transition portion 23 as the starting point.
2 extends outward along the wedge-shaped slope of the stuffing 25 at 8 parts, and is formed so as to overlap the outside of the transition part 23. With this configuration, compared to the conventional structure, both the size of the radial deviation of the magnetic center MO and the circumferential range where the deviation occurs are reduced, and as a result, the radial deviation on the outlet side of the rectangular plate coil is reduced. g acting on
% mechanical force can be reduced.

FIG. 5 is a plan view of a rectangular sum-shaped coil showing a modification of the embodiment of the present invention, which is different from the embodiment shown in FIG. Sej, tj, 3
The point + is that the parallel iI bodies 32a, 32h, 32c at σ are overlapped in the radial direction and wound twice to form the rectangular plate-shaped coil 31. In the mouth example, parallel conductors 32a + 32
Each transition part 33a r 3ab of b + 32c
+ 33e are disposed at predetermined intervals in the winding direction of the coil, and are disposed such that the transition portions are all in contact with the inner circumferential surface of the coil. Also, the stuffing 35 is 35a
+ 35b + 35c is formed into a wedge shape divided into three parts, and is interposed around the transition parts 33a + 33b + 33c. By forming the rectangular plate-shaped coil 31 in this way, the width of the coil that goes down to the lead wire 34 side is approximately equal to the product of JrI of the insulated conductor, the number of parallel conductors n, and the number of times N. Becomes a new πj-law, lL in magnetism? The radial deviation of Mo could be minimized, and as a result, the electromagnetic mechanical force acting in the radial direction could be significantly reduced compared to the conventional structure.

In addition, the number of parallel conductors is set to n so that the absolute Pg and the radial thickness t of the covered conductor 32 are approximately the same as the thickness of the covered conductor of high pressure seaming.
If one adjustment is made, it is also possible to minimize the radial electromagnetic mechanical force acting on both crimping amounts.

Figure 6 shows the state of the transition portion of a twin winding consisting of a pair of rectangular plate coils.
1 and 41 are the \1r column jaw body 3 of 3E as in Fig. 5.
2a T 32b + 32c stacked in the radial direction
Therefore, the reconnaissance line was connected, and Nafu! A pair of [
] The output lead is pulled out to form a twin winding. No. 61: 3 o'clock q total at Yl! Part 32R,
32b, 32c F/J1 coil 31...The No. 1 conductor 32c is the innermost, and the 32h is on the outside.
, 32a are overlapped and wound 1, but the ugly part 33a,
33b and 33c, and are disposed in the coil 41 so that the conductor 32IL is the innermost part of the coil and the conductor 32c is the outermost part.In the present invention, the position of the transition part is changed in the circumferential direction of the coil. Since they are arranged offset from each other, there is an advantage that dislocation of one body in parallel at the transition part is facilitated.

In addition, the stuffing inserted in the transition part is shown in the figure). The stuffing inserted in the part where the knob is applied is shown in the figure.
The part that engages with the conductor is cut out diagonally, and this part is formed into a thin wedge shape and is bonded to the surface of the insulated conductor with an adhesive or the like.

〔Effect of the invention〕

According to the present invention, as described above, the transition portion of the twin winding is provided close to the inner circumferential surface of the rectangular plate coil, and the maximum thickness of the stuffing inserted in the transition portion button is equal to the insulating wave V. It is formed into a wedge shape with approximately the same thickness as the conductor, and is configured so that the width of the coil does not increase due to the intervening filling. As a result, the deviation of the magnetic center position in the width direction of the rectangular plate coil was significantly reduced, and the electromagnetic mechanical force acting in the radial direction of the coil was suppressed to a minimum of 1 inch. ) 11. The man@button formed by row body is arranged by shifting the sheath part of each conductor in the circumferential direction, and dividing the stuffing into multiple pieces corresponding to the number of conductors and inserting them into the fJ transition part. By equipping the coil with a single conductor, the position of the magnetic center can be prevented from shifting as in the case of a coil formed of a single conductor, and the conductor in the twin winding can easily be rotated t'L.

17'c Due to the reduction of lightning and magneto-mechanical forces acting in the radial direction, mechanical reinforcement to prevent radial deformation of winding i is unnecessary or simplified, and the characteristics of the furnace-shaped plate coil are utilized. A 1 ton transformer with alternating windings is installed.
I was able to contribute to that.

[Brief explanation of the drawing]

FIG. 1 shows 141 of a transformer having mutually arranged windings 9. Then 1
・(1, 2nd Ray (and FIG. 3 is a T-side view of a conventional rectangular plate coil, FIG. 4 is a rectangular plate + I showing an embodiment of the present invention)
, Is: 1 is a 312-plane view of the coil, FIG. In Figure 8, which is a structural diagram, 1... Outer iron type &krL7.1a... Main leg part, 1c... Insulating tube, 2... Akane masterpiece IPi', 3
...Low pressure seaming, 3. ? l. 31... Rectangular plate-shaped coil, 22.32... Carp conductor, 32n. 32b, 32c... Parallel conductor, 23+ 33R+ 3
3b + 33cm 1" edge, 24.34... Output lead, 25.35... Packing q+l, R4o... Magnetic center position, W... Width of the coil. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1) A low voltage winding and a high voltage winding each consisting of a plurality of M rectangular coils in which an insulated conductor is wound multiple times in a rectangular plate shape and connected in series are insulators of an outer iron stacked iron core. The low-voltage winding is fitted alternately to the leg portions coated with the wires, and the low-voltage winding is a twin-sealed type having a transition portion on the inside of the winding, and the transition portion and a pair of opening portions are connected to the stacked iron core. In one provided on either side in the stacking direction, a wedge-shaped padding is interposed in contact with the transition portion and the conductor wound outside +c of the transition portion,
A transformer winding characterized in that the transition portion and the filling are formed so as to be in contact with the insulator. 2. In the product described in claim 1, the low-voltage winding is a parallel conductor divided into multiple layers in the winding direction of a rectangular coil, and the transition portion of each parallel conductor is connected to the inner periphery of the rectangular coil. The wedge-shaped padding is arranged at regular intervals in the circumferential direction on the side, and the wedge-shaped padding is divided corresponding to the number of parallel conductors. A transformer winding characterized in that it is formed so as to be in contact with a coil.