JPS5870511A - Multi-stage wound iron core - Google Patents

Abstract

PURPOSE:To decrease the using amount of a ribbon-shaped magnetic material by a method wherein a multi-stage wound iron core is composed of blocks split along the width direction of the magnetic material ribbon. CONSTITUTION:The section of a wound iron core is composed of blocks 7, 8, 9 split into three along the width direction of the ribbon of a magnetic material. Namely, the central block 8 made by winding a ribbon-shaped magnetic material with width (b) and the blocks 7, 9 made by winding a ribbon-shaped magnetic material with narrower width are superposed on the upper and lower opposite sides of the block 8 to form the section of the wound iron core. The center of the laminated layers of the blocks 7, 8, 9 is aligned in a straight line in the part of the leg section 1 of each block. Meanwhile, in a yoke section 2 wound no coil, the end sections at the iron core window 3 sides of the blocks 7, 9 at the opposite sides are marginally drawn to the iron core window 3. Therefore, this method can shorten the circumferential distance of the upper and lower outside blocks and reduce the using amount of the ribbon-shaped magnetic material.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a multi-stage wound core used in transformers, reactors, etc.

(b) Description of the Prior Art FIG. 1(a) is a front view of a conventional multi-stage wound core in a state where no coil is wound thereon, and FIG. 1-1(b) is a cross-sectional view thereof.

This conventional type is a single-phase inner core type with two stages and a multi-stage wound core. The entire multi-stage wound core has a substantially elliptical annular shape with parallel portions, and two long parallel portions are leg portions 1.1 around which a coil (not shown) is wound. The upper and lower curved parts connecting between the two legs 1.1 are the yoke parts 2.2,
No coil is wound here. The central space surrounded by the leg portion 1 and the yoke portion 2 is the iron core window 3.

The cross-sectional shapes of the leg part 1 and the yoke part 2 are the same, and the cross-sectional shape has a good space factor with respect to the circumscribed circle of the cross-sectional shape, that is, there is little gap between the coil and the coil when the coil is wound. Something is desirable. Therefore, as shown in the sectional view of FIG. 1(b), the iron core is formed by integrating blocks 4, 5, and 6, each of which has a roughly ramshape annular shape. Each block is generally made by winding a magnetic material such as a silicon steel plate rolled into a continuous ribbon in a generally oval shape. That is, the inner block 4 adjacent to the core window 3 is made by winding a narrow ribbon-shaped magnetic material, and the outer block 5 is made by winding a wide ribbon-shaped magnetic material. The block 6 was made by winding a ribbon-shaped magnetic material with the same width as the block 4.

However, in this structure in which three blocks 4.5.6 are stacked in order in the radial direction of a substantially elliptical shape, the cross section is divided vertically, that is, in the stacking direction of the magnetic material ribbons, and each block The width of the ribbon of magnetic material used for this purpose inevitably becomes wider, and it is difficult to obtain a wide magnetic material such as an amorphous magnetic material, or when a wide material is expensive. undesirable for Furthermore, in this structure in which blocks are stacked in the radial direction, the step shape of the yoke part 2 on which the coils and coils are not wound will inevitably be the same as the cross-sectional shape of the leg part 1, resulting in an overall ribbon-like shape. The disadvantage was that the amount of magnetic material used was wasted.

(c) Purpose of the Invention The present invention was devised in view of the above-mentioned drawbacks of the conventional type. By doing so, the purpose is to provide a multi-stage wound core that is lightweight and has good characteristics without wasting the ribbon-shaped magnetic material used.

(d) Structure of the Invention The first embodiment of the wound core according to the present invention will be described below in FIG.
) to (C). The wound core of this embodiment consists of blocks 7, 8, and 9 divided into three parts in cross section, ie, along the width direction of the ribbon of magnetic material. That is, a central block 8 made by winding a ribbon-like bamboo material with a width b1 and a block 7.9 made by winding a ribbon-like magnetic material having a narrower width are placed on both the upper and lower sides of the block 8, that is, the blocks. 8 are formed so as to overlap each other on both sides in the width direction of the ribbons.

In the leg portion 1, each block includes blocks 7, . The stacking centers of 8.9 are arranged in a straight line so that there is little gap when the coil is wound, and the space factor with respect to the circumscribed circle is good. On the other hand, in the part of the yoke part 2 where the coil is not wound, such a good space factor is not required, so the ends of the pro-tools on both sides on the iron core window 3 side are just as close to the iron core window 3. The iron core is closer to the window 3 than the conventional type shown in FIG. 1(b). For this reason, the upper and lower blocks 7.9 are configured to draw a narrower ellipse than the central block 8.

Note that an insulator 10 is sandwiched between the blocks in order to prevent defects in characteristics due to contact between the blocks.

In addition, in order to manufacture the wound core of this example, block 7
．． 8.9 can be manufactured separately and combined after each block is completed, or the three ribbon-shaped magnetic materials for block 7.8.9 can be simultaneously manufactured on a winding form that matches the shape of the iron core window 3. Wrap it around.

(e) Other Embodiments As described above, the first embodiment of the present invention is an iron type with two stages.
Although the description has been made regarding a stepped wound core, it is clear that the present invention can be applied to all other stepped wound cores such as single-phase outer iron type wound cores, three-phase tripod wound cores, and three-phase tripod wound cores. It is.

-5- A A single-phase outer iron type two-stage wound core will now be described as a second embodiment.

Conventionally, this wound core has a shape in which two generally elliptical ring-shaped wound cores are joined with one parallel portion of each core being adjacent to each other, as shown in FIG. 3.

A coil is wound around these adjacent parallel parts, ie the central leg 1, and no coil is wound around the two outer side legs 21, 21 and the yoke 2. Since the entire wound core is formed by joining two approximately elliptical annular wound cores, Fig. 3(b) (C
), the cross section of the side leg portion 21 and the yoke portion 2 is half the cross section of the leg portion 1. Then, in the leg part 1, a smaller block 4.4 is stacked on the core window side of the inner two block cocks 5.5 so that the cross section of the abutting parts of the left and right cores is nearly circular. There is. On the other hand, in the cross section of the yoke portion 2 and the side leg portions 21, similarly to the leg portion 1, the wide block 5 made of magnetic material is on the outside with respect to the core window 3, and the narrow block 4 is on the side of the core window. It has become. For this reason, the wide block 5 is wound in a large elliptical circle extending all the way to the outer edge of the iron core, which inevitably results in the disadvantage of using more material.

In a second embodiment in which the present invention is applied to this single-phase outer iron-wound core, as shown in FIG. There is. Then,
The central block 8, which has the same dimensions as the conventional narrow 1.0 block 4, is stacked in an oval shape all the way to the outer edge of the core. On the other hand, the small blocks 7.9 that are in contact with both sides of the block 8 are brought close to the core window 3 side in the side legs 21 and the yoke 2, and draw an oval shape narrower than the central block 8. It is layered in a similar manner.

Furthermore, a third embodiment in which the present invention is applied to a three-phase tripod two-stage wound core will be described.

Conventionally, this wound core has three wooden legs 1, 1 and 2 as shown in FIG.
Since the coil is wound around the yoke 1, the blocks are combined so that each block has the same cross-sectional shape, and the yoke portion 2 on which the coil is not wound also has the same cross-sectional shape.

-7- When the present invention is applied to this two-phase tripod wound core, as shown in FIG. In the yoke portion 2, the yoke 9 is brought close to the edge of the iron core window 3, and is configured to draw an ellipse that is narrower than the central block 8 as a whole.

In addition, in the above three embodiments, the wound core having two stages has been described, but the same can be applied to other multi-stage wound cores such as three stages and four stages.

Fig. 7 is a cross-sectional view of the portion where the coil is not wound for the three-stage wound core (corresponding to Fig. 2 (C), Fig. 4 (C), and Fig. 6 (c) in the above embodiment). ) is shown.

(f) Effects of the invention In the conventional 8-iron core structure, each block of magnetic material constituting the core is divided into the cross-sectional shape of the legs around which the coil is wound and the cross-section of the yoke and side iron parts where the coil is not wound. Since the shape was the same as that of the coil, the amount of ribbon-shaped magnetic material used was wasted, but according to the present invention, when J3 is placed in the hollow part of the coil, a block of vA bamboo material is used. It becomes possible to arrange the iron core closer to the window 3, and the circumferential distance of the approximately elliptical shape of the lower outer block constituting the wound iron core becomes shorter, which has the effect of reducing the amount of ribbon-shaped magnetic material used. . In addition, a wound core with good characteristics, such as low iron loss and exciting current, can be obtained. Furthermore, the ribbon of magnetic material constituting the conventional deke block needed to have a width equal to the width of the iron core, but according to the present invention, since the block is divided in the width direction, the ribbon width of the magnetic material can be reduced. It also has the advantage of being small and suitable for cases where it is difficult to obtain a wide magnetic material.

[Brief explanation of drawings]

FIG. 1 shows a conventional single-phase inner iron type double-stage wound core, in which (a) is a front view and (b) is a sectional view taken along line XX. FIG. 2 shows a first embodiment in which the present invention is applied to a double-phase inner iron type two-stage wound core, and (a) is a front view thereof;
(b) is a XX cross-sectional view, and (c) is a Y-Y cross-sectional view. Figure 3 shows a conventional single-phase outer iron type two-stage wound core, in which (a) is a front view of (a), (b) is a sectional view taken along line XX, and (C) is a Y- It is a Y cross-sectional view. FIG. 4 shows a second embodiment in which the present invention is applied to a single-phase outer iron type two-stage wound core, in which (a) is a front view thereof, (b) is a cross-sectional view taken along line XX, ( c) is a YY sectional view. FIG. 5 shows a conventional three-phase tripod two-stage wound core, in which (a) is a front view and (b) is a sectional view taken along line XX. 6 shows a third embodiment in which FIG. 6 is applied to a three-phase tripod two-stage wound core of the present invention, (a) is a front view thereof, (b)
) is an XX sectional view, and (C) is a YY sectional view. FIG. 7 is a sectional view of the unwound portion of the coil when the present invention is applied to a three-stage wound core. 1... Leg part, 2... Yoke part, 21... Side iron part, 3
... Iron core window, 4-9... Block, 10... Insulator. 7317 Representative Patent Attorney Kensuke Norichika (1 idiot) -10- Figure 5 Figure 6 (0)

Claims (1)

[Claims] A plurality of core blocks are formed by winding and laminating ribbon-shaped magnetic material into a hollow oval shape, and these multiple core blocks are combined in the width direction of the magnetic material to create a multi-stage winding structure with a core window in the center. The iron core is constructed such that the cross-sectional shape of each block in the legs around which the coil is wound has a good space factor with respect to the circumscribed circle of that cross-section, and in the part where the coil is not wound, each block A multi-stage winding core characterized by being placed on the window side of the core.