JPS5931011A - Shell type stepped wound core - Google Patents

Abstract

PURPOSE:To reduce the used amount of electric steel plates by a core wherein the sectional forms of outer legs having no winding wound round are changed respectively. CONSTITUTION:Units wound cores (a), (b), (c), (d), (e) manufactured by turning core materials separately are stacked in sequence to form wound cores 12 and 13, which are arranged side by side. The leg parts of the cores 12, 13 have cut surfaces such that one leg part constituting a center leg is shaped into the substantially semi-circular form including steps projected to the area of a window, and the other leg part constituting the outer leg is shaped into the substantially trapezoidal form including steps recessed along the outer periphery of a winding 4 to be wound. By so doing, it becomes possible to shorten the length of magnetic path of each unit wound core and to reduce the used amount of electric steel plates.

Description

Detailed Description of the Invention [0] Regarding the number of turns of the outer iron-type stage core of the present @8 pole-top transformer, the conventional outer iron-type wound core l has two pieces as shown in Fig. 1 (a) Φ). The wound iron cores 2 and 3 are placed side by side and integrated by band tightening, and the winding Iw4 is wound around the center leg. These wound cores 2 and 3 are shown in the z-z cross section in Figure Φ),
As shown in FIG. 2 and FIG. 8 in y-y cross section, both the legs and the yoke are each formed into a stepped, approximately semicircular shape with the cut surfaces protruding toward the inside of the window. In order to manufacture these outer iron type installed wound cores 2 and 3 tons, first, wrap the innermost unit turn core A with electrical steel plate having a narrow width, and then wrap the innermost unit turn core A around the unit turn core A to some extent. A unit winding core B is wound with a wide electric steel plate, and a unit winding core C is further wound around this with a wide electric copper plate to produce one winding core 2 and 3, respectively. Next, these wound cores 2 and 3 are integrated as shown in FIG. 1(a) Φ) to obtain a single outer iron type attached wound core 1.

Therefore, the cut surface of the center leg around which the winding 4 is wound is approximately circular.

In addition, it is the dimension of each stage part of α and β in FIG. 2, r is the dimension in the unit winding core AO, t is the winding thickness and vortex of the lead winding core C, and n is the unit @core 13- Indicates the winding thicknesses of C, A-B-C, respectively@Furthermore, L, , L1ζ indicate the window frame dimensions of the yoke portions of unit winding cores A, B, and C. In this case, other unit winding cores of different widths are sequentially wound around the outer circumference of the innermost unit winding core, and the outer leg with no windings protrudes into the window in the same way as the center leg. It is formed in a roughly semicircular shape. As a result, the dimensions of the yoke parts of unit-turn cores B and C wound around the outer periphery of unit-turn core A are longer than the yoke part of unit-turn core A, and the amount of electrical steel sheet increases accordingly. 1. In particular, it is very expensive when formed using a recently developed amorphous electrical steel sheet (which has the advantage of having 1/3 the iron loss compared to conventional electrical steel sheets, but is expensive). It is desirable to reduce the amount used as much as possible.

Therefore, in view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide an outer iron shadow line fJ4 iron core that can reduce the usage ML of P1 electrical steel sheets by changing the cross-sectional shape of the outer legs on which the windings are not wound. shall be.

Embodiments of the present invention will be described in detail below based on the drawings.

Originally M? Figure 4 (a) Φ) shows the flat 1 diagram and side view of the JO outer iron type multi-turn core, and the y-yWr blood is shown in Figure 4 (a) Φ), the l, It is shown in Figure 6.

IA iron type stepped pig iron Ib11 of this example, its winding core 12
and 13 are unit winding cores A and B as in the past.

Ct - What is constructed by sequentially winding from the inside to the outside?
i4, unit pig iron IU manufactured by winding each separately
amb, csdeektlAa as shown in Figures (a) and (b)
The cores 12 and 13 are formed by stacking I'fA layers, and these cores are arranged side by side.

As shown in FIG. 5, the cut surfaces of the legs of these wound cores 12 and 13 are approximately semicircular with a step where one leg that makes up the center leg protrudes into the window. Therefore, when the wound cores 12txs are placed side by side, the cut surface of the center leg becomes a stepped, approximately circular shape. becomes◎
In addition, the yoke part has unit winding cores a, b, and d.

By forming the leg portions of e to have the same dimensions as the window frame dimensions of the leg portions of unit winding core d, the inner circumferential surface of the window is formed into a stepped, approximately semicircular shape with a flat surface, as shown in Fig. 6. .

Fig. 1(a) shows an example of such an outer iron type multi-turn core 11.
~In order to manufacture the same dimensions as the conventional example shown in Fig. 3, first wind the electrical steel plate with the width a shown in Fig. 5, and then unit wind cores a and e with the winding thickness t using the electrical steel plate with the width -. A unit winding core with a winding thickness m and a unit winding core C with a winding thickness calculated using an electrolytic copper plate with a width r are manufactured separately. In this case, the window frame dimensions of the yoke part of the unit winding cores a and e are t, u tl< L
The window frame size t of the yoke portion is set at t3 and L1, respectively, and the winding is performed. In addition, the window frame dimensions of the legs of unit-turn cores a, b, d, and e are set to the same dimensions as unit-turn core C. Next, these unit-turn cores B-6 are shown in Figure m4 (a). As shown, the inner circumferential surface of the window of the yoke part is made flat, the outer surfaces of the legs constituting the center leg are made even, and the unit turns of the core at--the bottom layer are stacked in the order of C, D, and E to form the wound core 12. and 13 respectively. Furthermore, the wound cores 12 and 13t are juxtaposed and tightened together with a band (not shown) to complete the outer iron type attached wound core 11. Therefore, in the outer iron type attached wound core of this embodiment, While the cross-sectional shape of the center leg remains the same stepped and approximately circular shape as before, the cross-sectional shape of the outer leg becomes a stepped approximately trapezoidal shape that follows the outer periphery of the winding, and the cross-sectional shape of the yoke portion is set within the window. The circumferential surface is flat and has a roughly trapezoidal shape. As a result, the window frame dimensions of the fields and legs of the unit winding cores a, b, d, and e are shorter than 70), making it possible to make the magnetic path length shorter than before. , m2 invention will be explained. Figure 7.

An example is shown in FIG.

As shown in Figure 7, the outer iron forming and the single-turn iron core 11' of this embodiment have a unit pig iron core diameter and the yoke part window frame dimension t of
, the yoke part window frame dimension of the unit winding core d is t2”f:t
2 < I-+ 2, and the window frame dimension of the yoke part of the unit-turn core C is set to t: == L 1, and the inner peripheral surface of the window of the outer leg is made flat.

The cross-sectional shapes of the center leg and the yoke portion are the same as those of the previous embodiment of the invention, as shown in FIG. However, in this embodiment as well, the magnetic path length can be made shorter than in the conventional case.

As explained above, according to the outer iron type installed wound core of the present invention, the window inner peripheral surface of the outer leg where no winding is wound is formed into a stepped shape along the outer periphery of the winding or is arranged flat. By doing so, the magnetic path length of each unit-turn core can be shortened. Moreover, since the inner peripheral surfaces of the windows of the upper and lower yoke parts can be made flat, the effect is further increased. As a result, the amount of electrical steel sheet used can be reduced, which is particularly economically advantageous when amorphous electrical steel sheet is used. Furthermore, since each unit winding core can be manufactured by winding it separately, productivity can be improved.

[Brief explanation of the drawing]

Figure 1 ((translation) to Figure 3 relate to the conventional example, and Figure 1 (a)
And (b) is a plan view and a side view of the outer iron type installed wound core, and Figures 2 and 3 are in Figure 1<b)! -Z. y-y arrow sectional views, Figures 4(a) to 6 relate to an embodiment of Ml's invention9, Figures 4(a) & ↓ and (b) are wound cores with outer iron type. FIG. 5 is a plan view and a side view of FIG. Figure 6 is a sectional view taken in the direction of the arrows X"-, 7, yl-yI of Figure 4Cb), Figure 287, and Figure 8 show an embodiment of the invention of Series 2, l, 1.yl-yl It is a side view of arrow VIIr.In the drawing plane, 4 is winding-1, 11, 11' are outer iron type M!Wound pig iron υ, 12.13.1
2' and 13' are pig iron υ, a @ b @ C @ d
a t is O% of unit winding core Applicant: Kyoto Electric Power Company, Inc., Takagaku Seisakusho Co., Ltd. Representative: Patent attorney Shibe Mitsuishi (and 1 other person) Figure 1 (b) Figure 2 Figure 3 Figure 5 Figure 7 Figure 8 Figure 13'

Claims (1)

[Scope of Claims] l) Electrical steel plates of different widths are wound into a window frame shape so that the window frame dimensions of the yoke part are raised, and a plurality of unit winding cores of different widths are sequentially stacked and constructed. A step-wound iron core characterized by the fact that the inner circumferential surface of the window on the outer leg is stepped along the outer circumferential surface of the winding wound around the center leg. 2) The different electrolytic copper plates inside are wound in the shape of a window frame, and a plurality of unit winding cores with different window frame dimensions and widths in the yoke part are stacked one after another. An outer iron-shaped stepped several-turn iron core characterized by a stepped approximately trapezoidal core with a flat circumferential surface.