JP5161039B2 - Coil winding frame for transformer and transformer using the same - Google Patents

Description

  The present invention relates to a coil winding frame for a transformer around which a coil is wound, and a transformer using the same.

  Conventionally, a coil winding frame of a transformer has a structure in which one rectangular coil winding frame or a plurality of coil winding frames are arranged in the width direction of a wound core material.

  As a technique related to the present invention and described in the literature, for example, there is a technique described in Patent Document 1. Patent Document 1 discloses an amorphous wound core transformer in which a coil winding frame made of a winding frame member is provided on the innermost periphery of a coil. Moreover, the structure which has a reinforcement frame which presses the outer side of the coil in which an outermost wound iron core surrounds a wound iron core and a wound iron core is inserted is described.

  When such a transformer is applied to a large-capacity transformer, the iron core is configured to have a large cross-sectional area. There is a problem that the inner winding is deformed so as to be dented inward by the working electromagnetic mechanical force (see FIG. 9), the iron core is pressed, and iron loss and excitation current are deteriorated.

  In addition, a discharge is formed by forming a substantially chevron-shaped thick part with a thick central part on each surface of the coiled part of the square cylindrical coil, increasing the strength of the central part and increasing the resistance to deformation during winding. A bobbin shape used for a ballast or the like has been proposed (see Patent Document 2). In this proposal, since only the central part of each side is formed thick, it takes time to manufacture such a coil winding part, and it is difficult to reduce costs by using many materials in terms of the amount of material. .

  On the peripheral surface of the intermediate cylinder part around which the coil of the hooked bobbin is wound, the central part is formed thick so that each peripheral surface has an arc shape protruding outward, and the lowermost coil is connected to each of the intermediate cylinder parts. There has been proposed an electromagnetic coil which is wound in a state of being in uniform contact with a peripheral surface to prevent the coil from being lifted (see Patent Document 3). Since only the central part of each side is formed thick, there are the same problems and defects as in Patent Document 2.

Even if the winding tightening force is applied when the voltage winding is wound, by causing the inner surface of the hollow hole of the coil winding frame to bulge outward in an arch shape, an arch effect is produced in the swollen portion. There has been proposed a voltage electromagnet device for a watt hour meter in which the coil winding frame portion is less deformed inward (see Patent Document 4). The coil winding frame inflated in an arch shape is formed on the entire circumference, and there are restrictions on the shape.
JP-A-10-340815 Japanese Utility Model Publication No. 58-32609 Japanese Utility Model Publication No. 55-88210 JP-A-10-116719

  Therefore, a coil winding frame for a transformer disposed on the innermost circumference of the inner winding, and a transformer using the transformer, and buckling that may affect the pressing of the iron core due to strength improvement. There is a problem to be solved in terms of avoidance.

  An object of the present invention is to secure a buckling strength of an inner winding in a transformer, prevent the iron core from being compressed, and use a coil winding frame for a transformer that does not deteriorate iron loss or exciting current, and the same. Is to provide a transformer.

  In order to solve the above problems, a coil winding frame according to the present invention is a coil winding frame for a transformer disposed on the innermost coil of a coil into which an iron core is inserted, and has strength against buckling recessed inward. It is characterized by improvement. In addition, the transformer according to the present invention is composed of a wound iron core in which the magnetic core is wound in multiple layers or a stacked iron core stacked in multiple layers, and the coil is inserted into the iron core, and the strength against buckling recessed inside is provided. The coil winding frame with the improved is arranged on the innermost periphery of the coil.

  According to the coil winding frame and the transformer using the same according to the present invention, the buckling strength of the coil winding frame provided on the innermost circumference of the inner winding is improved by a simple method. The bending strength can be improved, and even in a large-capacity transformer, the iron core is not compressed by the buckling of the inner winding, and the iron loss and the excitation current can be prevented from being deteriorated.

  The best mode for carrying out the present invention will be described below with reference to the drawings. 1-8 is explanatory drawing which shows the coil winding frame by this invention, and a transformer using the same.

  A first embodiment of a transformer according to the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a first embodiment of a transformer according to the present invention. FIG. 2 is an external view of a coil winding frame used in the transformer shown in FIG. Hereinafter, also in the second to fourth embodiments, the same reference numerals are used for the constituent elements used in the drawings.

  In the first embodiment of the transformer shown in FIG. 1, the transformer includes an iron core 3 and a coil 2 wound around the iron core 3. The coil 2 includes an inner winding 21 and an outer winding 22 wound concentrically around the outer side through main insulation. The iron core 3 can be formed by, for example, winding an amorphous magnetic ribbon in multiple layers, but is not limited thereto. A coil winding frame 1 a is provided further inside the inner winding 21. The coil winding frame 1a is provided with a winding frame member insulating portion 4 so as not to form a magnetic field line loop. The core characteristics of the iron core 3 are sensitive to stress particularly when an amorphous wound iron core is used, so that no force is applied to the iron core 3 from the coil winding frame 1a. Spacers 5 are inserted on the four side surfaces of the iron core 3.

  Assuming that the coil winding frame has a rectangular cross section in the transformer structure, for example, when a short circuit occurs on the load side of the transformer and a short circuit current is generated in the coil 2, the inner winding 21 is electromagnetically directed inward. The mechanical force works to cause buckling so that the coil winding frame is recessed inside, that is, the iron core 3 side. The buckling of the coil winding frame 1a occurs in such a manner that the central part is recessed on the side surface located on the long side of the cross section rather than on the short side of the cross section. When buckling occurs in the coil winding frame 1a, the coil 2 is deformed, and the iron core 3 is pressed by the buckling, so that iron loss and excitation current are deteriorated.

  In the present invention, in order to prevent such a coil winding frame from buckling, a coil winding frame 1a formed in an arcuate cross section is used. FIG. 2 is an external view of a coil winding frame 1a used in the transformer shown in FIG. As shown in FIGS. 1 and 2, the coil winding frame 1a is formed in a cross-sectional arc shape in which coil winding frame portions 11a and 11a on the long side of the cross section, which are particularly susceptible to buckling, bulge outward. Due to such an arcuate cross-sectional shape, the coil winding frame portions 11a and 11a are provided with a resistance that causes the central portion to be recessed toward the iron core 3 side. That is, in order to cause the coil winding frame portions 11a and 11a to buckle inwardly, a large force is required so as to be deformed against the arcuate bulge on the outside. It shows that the bending strength is increased. The coil winding frame portions 11b and 11b on the short side side of the cross section are formed on a flat surface because buckling itself is relatively difficult to occur. The buckling strength of the arcuate coil winding frame 1a can be improved by about 30% compared to the conventional rectangular coil winding frame.

  A second embodiment of the transformer according to the present invention will be described with reference to FIGS. FIG. 3 is a cross-sectional view showing a second embodiment of the transformer according to the present invention. FIG. 4 is an external view of a coil winding frame used in the transformer shown in FIG. In the second embodiment, the coil winding frame 1b is subjected to a pressing process 12c, and the other structure is the same as that of the first embodiment. As shown in FIG. 4, the pressing process 12 c is performed at a plurality of locations in the coil winding frame portions 12 a and 12 a on the long side of the cross section where buckling is likely to occur, and therefore the buckling strength is required. The coil winding frame portions 12a and 12a tend to undergo bending deformation when attempting to buckle in a state of being recessed inward at the center portion thereof, but the pressing process 12c has an effect of resisting this bending. The buckling strength of the coil winding frame 1b is improved.

  The buckling strength of the coil winding frame 1b subjected to the press-out processing is improved by about 60% compared to the conventional rectangular coil winding frame. In addition, since the buckling strength changes depending on the shape of the extrusion process, the machining shape of the extrusion process can be determined according to the electromagnetic mechanical force generated from the inner winding 21.

  A third embodiment of the transformer according to the present invention will be described with reference to FIGS. FIG. 5 is a cross-sectional view showing a third embodiment of the transformer according to the present invention. FIG. 6 is an external view of a coil winding frame used in the transformer shown in FIG. In the third embodiment, the coil winding frame 1c is a cylinder and the columns 6 and 6 are provided in the hollow portion, and the other structure is the same as that of the first embodiment. The coil winding frame 1c has a cylindrical outline, but is discontinuous by the insulating portion 4 at four equal intervals. The coil winding frame 1c and the columns 6 and 6 are made of a metal plate, and the coil winding frame 1c is connected to the insulating portion 4 by welding to the side ends of the columns 6 and 6 at an angular position about 45 degrees around the center. The struts 6 and 6 are also manufactured by, for example, forming a cross shape by welding. The iron core 3 is configured by combining a large (large area) portion and a small (small area) portion in order to fill the space in the coil winding frame 1c. As for the spacer 5, the large and small portions are arranged in a relatively wide portion facing the inner surface of the coil winding frame 1c.

  The cylindrical coil winding frame 1c is composed of four cylindrical piece-shaped coil winding frames 13a, 13b, 13c, and 13d, and each of the coil winding frames 13a to 13d has an arcuate shape that bulges outward. Due to this force, the strength against buckling is strong toward the inside, and in addition, the buckling strength is further improved because it is reinforced from the inside by the pillars 6 and 6 assembled in a cross shape. Providing the columns 6 and 6 not only improves the buckling strength, but also contributes to improving the workability of inserting the iron core 3 into the coil 2 during assembly.

  A fourth embodiment of the transformer according to the present invention will be described with reference to FIGS. FIG. 7 is a cross-sectional view showing a fourth embodiment of the transformer according to the present invention. FIG. 8 is an external view of a coil winding frame used in the transformer shown in FIG. In the fourth embodiment, similarly to the first embodiment, the coil winding frame 1d has an arcuate shape that bulges outward. Further, similarly to the second embodiment, the long-side coil winding frame portion 14a, A plurality of extruding processes 14c directed outward are applied to 14a.

  The transformer according to the present invention is not limited to the respective coil winding structures as shown in FIGS. 1 to 6. For example, as shown in FIGS. 7 and 8, an arcuate coil winding frame subjected to extrusion processing is used. This also applies to the combination structure. The cylindrical coil winding frame shown as the third embodiment may be subjected to the pressing process shown in the second embodiment.

It is winding sectional drawing which shows 1st Example of the transformer by this invention. It is an external view of the coil winding frame used for the transformer shown in FIG. It is winding sectional drawing which shows 2nd Example of the transformer by this invention. It is an external view of the coil winding frame used for the transformer shown in FIG. It is winding sectional drawing which shows 3rd Example of the transformer by this invention. It is an external view of the coil winding frame used for the transformer shown in FIG. FIG. 7 is a winding cross-sectional view showing a fourth embodiment of a transformer according to the present invention. It is an external view of the coil winding frame used for the transformer shown in FIG. It is sectional drawing which shows the mode of the buckling of the coil winding frame used for the conventional transformer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a ... Bow-shaped coil winding frame 1b ... Coil winding frame 1c which gave the press-out process ... Coil winding frame 1d which provided the support | pillar to the cylinder ... The arc-shaped coil winding frame 2 which gave the press-work process ... Winding 22 ... Outer winding 3 ... Iron core 4 ... Winding member insulation 5 ... Spacer 6 ... Post 11a, 11b ... Coil winding frame 12a, 12b ... Coil winding frame 12c ... Extrusion processing 13a, 13b, 13c, 13d ... Coil winding frame portions 14a, 14b ... Coil winding frame portion 14c ... Extrusion processing 21 ... Inner winding 22 ... Outer winding

Claims (3)

In the coil winding frame for the transformer disposed in the innermost coil of the coil into which the iron core is inserted,
The coil winding frame is a rectangular coil winding frame composed of two opposing long-side coil winding frame portions and two opposing short-side coil winding frame portions, and has a cross-sectional arc shape. , The extrusion process is formed,
The arcuate shape and the pressing process are formed in a form that swells from the inside to the outside of the coil winding frame in order to counter buckling that is about to occur toward the inside of the coil winding frame.
The formation of the extruding process is performed in a shape extending in the circumferential direction in the coil winding frame portion of the long side,
A coil winding frame for a transformer, which has improved strength against buckling recessed inward. In the coil winding frame for the transformer disposed in the innermost coil of the coil into which the iron core is inserted ,
The coil winding frame is formed in a cross-sectional cylindrical shape or an arcuate shape , and is supported by a support from the inside, and the coil winding frame is formed by pressing.
A coil winding frame for a transformer, which has improved strength against buckling recessed inward . The core consists of a product core stacked on the winding core or multilayer by winding a magnetic band multilayer, the coil is inserted in the core, according to claim 1 or claim with improved buckling strength against buckling that the previous SL coil body 2 described is disposed on the innermost circumference of the coil, a transformer, wherein the.

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