JP6310966B2 - Amorphous iron core transformer - Google Patents

Description

  The present invention relates to a technique for providing an amorphous iron core transformer, and particularly to a coil structure in which winding of an electric wire is devised.

  As background art of this technical field, there is JP-A-10-340815 (Patent Document 1). In this publication, in an amorphous wound iron core transformer having an amorphous wound iron core wound with multiple layers of amorphous magnetic ribbons and a plurality of coils, the buckling strength for the inner winding and the outer winding is ensured, and the amorphous winding is wound. The iron core is not pressed and iron loss and excitation current are not deteriorated. It is described. There is also JP-A-2010-118384 (Patent Document 2). In this publication, a coil winding frame for a transformer that secures the buckling strength of the inner winding in the transformer, prevents the iron core from being compressed, and does not deteriorate the iron loss or the excitation current, and the transformer using the same. Provide a bowl. It is described.

  In addition, spacers (wedges) are provided on the inside and outside of the bobbin (insulating frame), such as Japanese Patent Application Laid-Open No. 54-142520 (Patent Document 3) and Japanese Utility Model Application Laid-Open No. 58-129624 (Patent Document 4). The structure which prevents this is disclosed.

  Furthermore, in JP-A-10-97928 (Patent Document 5), a spacer is provided between the iron core and the primary winding, and between the primary winding and the secondary winding, and the winding vibrates when the transformer is driven. A configuration for preventing friction and preventing noise is disclosed. In the present invention, a spacer is not provided between the primary winding and the secondary winding, but when a multi-stage winding is wound around both or one of the primary winding and the secondary winding. The cross-sectional shape of the coil is made a shape close to a substantially elliptical shape.

Japanese Patent Laid-Open No. 10-340815 JP 2010-118384 A Japanese Patent Laid-Open No. 54-142520 Japanese Utility Model Publication No.58-129624 Japanese Patent Laid-Open No. 10-97928

  Patent Documents 1 and 2 describe the buckling strength of an amorphous iron core transformer against a coil. However, both patent documents do not describe a gap generated between the electric wire and the bobbin during the winding work.

  FIG. 9 shows a coil cross-sectional view of a conventional amorphous iron core transformer. When manufacturing a transformer using an amorphous iron core 902, the amorphous ribbon is very thin and difficult to form, so it is common to stack amorphous ribbons having the same width to form a wound core. For this reason, the cross-sectional shape of the amorphous iron core 902 is rectangular, and a rectangular bobbin 905 is used in accordance with the rectangular shape. Therefore, a gap 910 is generated in a linear portion between the inner coil 907 and the rectangular bobbin 905 during winding work. In the prior art, a press process is provided to reduce the gap, and the coil is dimensioned, which causes an increase in the number of work steps. Further, there is a method of reducing the gap by winding the wire strongly, but there is a possibility that the insulating coating of the wire is broken at the corner of the rectangular bobbin. As a result, in the case where the coil dimension becomes larger than the design value and assembly is impossible, or in the short circuit test after the transformer assembly is completed, repulsion occurs between the inner coil 907 and the outer coil 908 due to the electromagnetic mechanical force generated at the time of short circuit. When the electric wire falls in the gap 910 between the coil 907 and the rectangular bobbin 905, a gap 911 is generated between the inner coil 907 and the outer coil 908, and the short-circuit impedance is increased. Further, the amorphous iron core is pressed and a load is applied to the amorphous iron core, so that the no-load loss is deteriorated. As a result, the standard value may not be satisfied and the type test or the like may be rejected. In particular, it was difficult to manufacture a large capacity model in which the electromagnetic mechanical force at the time of a short circuit is large due to these problems. Incidentally, the electromagnetic mechanical force of the coil is a force that acts according to the law that the electric currents flowing in the same direction at the time of short circuit are attracted and the electric wires flowing the current in the opposite direction repel each other.

  Patent Documents 3 and 4 disclose a structure that can suppress fluctuations in coil dimensions before and after a short circuit by interposing a spacer in advance in a gap caused by repulsion as a structure that solves the above problem. During the winding work, there is a possibility that the insulating coating of the electric wire is damaged due to the large curvature of the electric wire in the vicinity of the corner of the iron core.

  Moreover, although the structure of patent document 5 is hard to generate | occur | produce the damage of the insulation film of the above electric wires from the shape of the coil, the external shape of the whole coil becomes very large with respect to an iron core, The size of transformer itself Has the disadvantage of becoming larger.

  In the prior art, a pressing process is provided in order to reduce the above-mentioned gap, and the coil is dimensioned, which causes an increase in work man-hours. Moreover, although there exists a method of reducing a clearance gap by winding an electric wire strongly, there exists a possibility of destroying the insulation film of an electric wire in the corner | angular part of a rectangular bobbin by winding strongly. Therefore, the present invention provides an amorphous iron core transformer that has a coil that reduces the gap between the coil wire and the bobbin at low cost and realizes space saving.

The amorphous iron core transformer of the present invention is a transformer having a coil consisting of an inner coil and an outer coil formed by providing a rectangular bobbin outside the amorphous iron core and winding an electric wire around the rectangular bobbin. The inner coil is wound with a plurality of cooling ducts inserted between the windings of the inner coil, and the inner coil wound with the cooling ducts inserted has a shape that is closer to a circular shape on the outermost periphery than on the innermost periphery. It is characterized by being.

  According to the present invention, by providing the spacer, the angle of the rectangular bobbin corner becomes gentle, and by providing the duct between the windings of the inner coil and the outer coil, the load on the insulating coating of the electric wire can be reduced. Is possible. Therefore, even if the wire is wound strongly, there is no fear of the insulation breakdown of the wire, and the finished dimension of the coil can be further reduced.

  In addition, according to the present invention, the coil of the amorphous iron core transformer has a structure in which there is no gap between the electric wire and the rectangular bobbin, so that the pressing process of the coil is not required and the working efficiency is improved.

  In addition, there is no space between the wire and the bobbin against the repulsive force acting between the inner coil and the outer coil due to the electromagnetic mechanical force generated at the time of short circuit, so there is no space for the wire to drop, and the short circuit impedance after the short circuit The rate of change and the deterioration rate of no-load loss can be reduced.

  Therefore, in the amorphous iron core transformer, it is possible to manufacture a large-capacity model having a large electromagnetic mechanical force at the time of a short circuit, which is difficult to manufacture by the prior art.

It is a schematic explanatory drawing which shows the content structure of the amorphous iron core transformer of this invention. It is coil sectional drawing which shows an example of the spacer of the amorphous iron core transformer of this invention. It is coil sectional drawing which shows an example of the spacer of the amorphous iron core transformer of this invention. It is coil sectional drawing which shows an example of the spacer of the amorphous iron core transformer of this invention. It is coil sectional drawing which shows an example of the shape and arrangement | positioning of the cooling duct of the amorphous iron core transformer of this invention. It is coil sectional drawing which shows an example of the shape and arrangement | positioning of the cooling duct of the amorphous iron core transformer of this invention. It is coil sectional drawing which shows an example of the shape and arrangement | positioning of the cooling duct of the amorphous iron core transformer of this invention. It is coil sectional drawing of the Example of the amorphous iron core transformer of this invention. It is coil sectional drawing of the conventional amorphous iron core transformer.

  An amorphous iron core transformer according to an embodiment of the present invention has a rectangular shape by providing a spacer in a transformer having a coil in which a wire is wound around a rectangular bobbin by providing a bobbin having a rectangular cross section outside the amorphous iron core. The size of the gap between the bobbin and the electric wire is reduced.

  Further, in the amorphous iron core transformer of the embodiment of the present invention, in the coil of the amorphous iron core transformer, the spacer is provided on at least one side of the four straight portions of the rectangular bobbin so as to make the angle of the rectangular bobbin corner gentle. It has a structure that reduces the load on the insulation coating of the electric wire.

  Furthermore, the amorphous iron core transformer of the embodiment of the present invention is a coil of an amorphous iron core transformer, wherein the spacer is any one of an arc shape, a step shape, a trapezoidal shape, or a square shape, and is provided between the rectangular bobbin and the electric wire. The cross-sectional shape of this is a substantially elliptical shape.

  Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.

  FIG. 1 is a schematic explanatory view showing the content configuration of an amorphous iron core transformer according to an embodiment of the present invention. The transformer content 101 includes an amorphous iron core 102, a coil 103, and a metal fitting 104 for fixing them. The coil 103 is configured by winding an electric wire on a rectangular bobbin described later. In this case, a diagram in which a spacer is provided in order to reduce the size of the gap generated between the electric wire and the rectangular bobbin will be described.

  FIG. 2 is a cross-sectional view of the coil 203 of the amorphous iron core transformer according to the embodiment of the present invention, in which a rectangular bobbin 205 is provided outside the amorphous iron core 202, and an inner coil 207 and an outer coil 208 are wound around the rectangular bobbin 205. turn. The arc-shaped spacer 206 is provided between the rectangular bobbin 205 and the inner coil 207 to form a coil 203 having a substantially elliptical cross section. At this time, the corners of the rectangular bobbin serve as a guide, and the angle between the first step of the inner coil 207 and the portion where the rectangular bobbin 205 contacts becomes loose. Further, the shape of the spacer 206 is not limited to an arc shape, but may be a square shape, a trapezoidal shape, a staircase shape, or the like as long as the space between the rectangular bobbin 205 and the inner coil 207 can be reduced.

  FIG. 3 is a sectional view of a coil 303 of an amorphous iron core transformer according to an embodiment of the present invention. A cylindrical bobbin 305 is provided outside the amorphous iron core 302, and an inner coil 307 and an outer coil 208 are provided on the cylindrical bobbin 305. Wind it. The arc-shaped spacer 306 is provided between the rectangular amorphous iron core 302 and the cylindrical bobbin 305, and forms a coil 303 having a substantially elliptical cross section.

  FIG. 4 is a sectional view of a coil 403 of an amorphous iron core transformer according to an embodiment of the present invention. A rectangular bobbin 405 is provided outside the amorphous iron core 402, and an inner coil 407 and an outer coil 408 are provided on the rectangular bobbin 405. Wind it. Two arcuate spacers 406 are bonded to each other and are provided between the inner coil 407 and the outer coil 408 to form a coil 403 having a substantially elliptical cross section.

  FIG. 5 is a cross-sectional view of a coil 503 of an amorphous iron core transformer according to an embodiment of the present invention, in which a rectangular bobbin 505 is provided outside the amorphous iron core 502, and an inner coil 507 and an outer coil 508 are provided on the rectangular bobbin 505. Wind it. Usually, the number of cooling ducts 509 corresponding to the coil temperature increase is provided in the coil 503 to alleviate the temperature increase. In this embodiment, the insertion section of the cooling duct 509 provided in the inner coil 507 is set so that the section of the cooling duct provided outside is equal to or less than the distance of the cooling duct provided inside, and the cross-sectional shape is substantially elliptical. A coil 503 having a shape is formed. Alternatively, the insertion section of the cooling duct 509 ′ provided in the inner coil 507 is set to have an equal distance or more in the section of the cooling duct provided outside than the section of the cooling duct provided inside, and the cross-sectional shape is substantially elliptical. A coil 503 is formed. In FIG. 5, the cooling ducts are arranged in different shapes on each of the four sides of the bobbin 505. However, this example is not an example, and the arrangement of the ducts on each of the four sides is not limited to various examples. It is displayed as one figure.

  FIG. 6 is a cross-sectional view of a coil 603 of an amorphous iron core transformer according to an embodiment of the present invention, in which a rectangular bobbin 605 is provided outside the amorphous iron core 602, and an inner coil 607 and an outer coil 608 are provided on the rectangular bobbin 605. Wind it. In this embodiment, the width of the cooling duct 609 provided in the inner coil 607 is equal to or greater than the width of the cooling duct provided in the center of the straight portion than the width of the cooling duct provided at both ends. Forms a substantially elliptical coil 603.

  FIG. 7 is a cross-sectional view of a coil 703 of an amorphous iron core transformer according to an embodiment of the present invention, in which a rectangular bobbin 705 is provided outside the amorphous iron core 702, and an inner coil 707 and an outer coil 708 are provided on the rectangular bobbin 705. Wind it. In this embodiment, the cooling duct 709 provided in the inner coil 707 is provided only at the center of the straight portion, thereby forming the coil 703 having a substantially elliptical cross section. In the embodiment shown in the above drawings, the embodiment is described with reference to the drawing in which the duct is interposed only in the inner coil. However, this is not an explanation that the invention is to arrange the duct only in the inner coil. For simplification of the drawing, the drawing is drawn only in the inner coil, but a duct may be interposed in both the inner and outer coils.

  FIG. 8 shows an example in which a spacer is provided around an amorphous iron core in which the spacers and cooling ducts exemplified in the above embodiments are combined, and cooling ducts are provided in the two short side directions of a rectangle that is a cross section of the amorphous iron core transformer. Shown in The embodiment shown in FIG. 8 is a realistic embodiment. In this embodiment, a spacer is provided around the amorphous iron core, and further, a cooling duct is interposed only in the vertical direction in the drawing of the coil. The coils 807 around the four corners can be gently wound as compared with the coil 907 in FIG. 9, and the insulating coating can prevent damage. In addition, by adopting a substantially elliptical shape, it is possible to suppress an increase in the dimension in the horizontal direction in the figure (a long side direction opposite to a rectangle that is a cross-sectional shape of the amorphous iron core), and space saving is also realized. Is.

  Here, the shapes, arrangements, and the like of the spacer 806 and the cooling duct 809 can be appropriately selected and combined from the examples shown in FIGS.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments describe the present invention in detail in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. A part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. That is, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

For example, a coil structure in which the configurations of FIGS. 5 to 6 are provided in the configurations of FIGS. 2 and 3 is also possible.
Specifically, if possible examples are listed, the spacer is provided on at least one of the four sides of the bobbin, thereby relaxing the angle of the corner of the bobbin and reducing the load on the insulating coating of the wire. The structure can be made. The spacer may be arc-shaped, stepped, trapezoidal or square.
In the amorphous iron core transformer of the present embodiment, a cylindrical bobbin is provided outside the amorphous iron core, and the coil has a coil in which an electric wire is wound around the cylindrical bobbin, and the spacer is arcuate, stepped, trapezoidal or It is any one of quadrangles, and is provided between the amorphous iron core and the cylindrical bobbin, and the cross-sectional shape of the coil is substantially elliptical.
Further, in the coil of the amorphous core transformer of this embodiment, the spacer has a circular arc shape, a staircase shape, a trapezoidal shape, or a square shape, and is provided between the inner coil and the outer coil of the coil. The cross-sectional shape of the coil can be substantially elliptical.
Regarding the arrangement of the cooling duct interposed in the coil, even if the cross-sectional shape of the amorphous iron core is almost a rectangle, the cooling duct arranged in each side direction has a mountain shape from the outside toward the center. The coil can be formed to have a substantially elliptical cross section by gradually increasing the arrangement width (intervening width) of the cooling duct in the radial direction of the coil and interposing it in an arc shape.
In the cooling ducts that are arranged in a predetermined stage of the coil wound in the direction of each side of the rectangle, which is the cross-sectional shape of the amorphous iron core, interposed in the coil, the center point of each side of the rectangle is used as a reference The cooling ducts were arranged so that the distances between both ends of the cooling ducts in each stage were equal, and the distances between both ends of the cooling ducts were shorter than the length of each side of the rectangle.
In the coil of the amorphous iron core transformer of the present embodiment, the cooling duct insertion section in the inner coil of the coil is set to be equal to or less than the distance of the cooling duct provided outside than the section of the cooling duct provided inside, The cross-sectional shape of this is a substantially elliptical shape.
On the other hand, in the coil of the amorphous iron core transformer of the present embodiment, the cooling duct insertion section in the inner coil of the coil is equal to the section of the cooling duct provided outside than the section of the cooling duct provided inside. As described above, the cross-sectional shape of the coil is substantially elliptical. In that case, it is preferable to arrange the outer ducts in an arc shape.
Further, in the coil of the amorphous iron core transformer of the present embodiment, the width of the cooling duct in the inner coil of the coil is equal to the width of the cooling duct provided at the center of the straight portion, rather than the width of the cooling duct provided at both ends. As described above, the cross-sectional shape of the coil is substantially elliptical. Moreover, in the coil of the amorphous iron core transformer according to the present embodiment, the cooling duct in the inner coil of the coil is provided only at the center of the straight portion, so that the cross-sectional shape of the coil is substantially elliptical. Further, the spacer and the cooling duct may be arranged only on the two short sides in the rectangle which is the cross-sectional shape of the amorphous iron core.

101 Amorphous iron core transformer content 102, 202, 302, 402, 502, 602, 702, 802, 902 Amorphous iron core 103, 203, 303, 403, 503, 603, 703, 803, 903 Coil 104 Hardware 205, 305, 405 , 505, 605, 705, 805, 905 Bobbins 206, 306, 406, 806 Spacers 207, 307, 407, 507, 607, 707, 807, 907 Inner coils 208, 308, 408, 508, 608, 708, 808, 908 Outer coil 509, 509 ', 609, 709, 809 Cooling duct 910 Clearance 911 Clearance after short circuit

Claims (4)

A rectangular bobbin is provided outside the amorphous iron core, and an electric wire is wound around the rectangular bobbin.
In a transformer having a coil consisting of an inner coil and an outer coil,
The coil is wound with a plurality of cooling ducts inserted between the windings of the inner coil,
The inner coil wound with the cooling duct inserted has a circular shape on the outermost circumference rather than the innermost circumference.
The shape is
The transformer is characterized in that the cooling duct has a larger number of cooling ducts arranged on the outer peripheral side than on the inner peripheral side. The transformer according to claim 1,
The transformer is characterized in that the insertion section of the cooling duct has an insertion section provided outside the coil equal to or longer than the insertion section provided inside the coil. The transformer according to claim 1 or 2,
The transformer is characterized in that the coil is gradually thinned from a central region of a long side or a short side of the rectangular bobbin to a corner region. The transformer according to claim 1 or 2,
The width of the cooling duct is such that the width of the cooling duct provided in the central region of the long side or short side of the rectangular bobbin is equal to or greater than the width of the cooling duct provided on both ends of the long side or short side. A transformer characterized by being.

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