JP2014229807A - Transformer and bobbin for transformer - Google Patents

Abstract

A transformer and a transformer bobbin capable of reducing the number of steps in assembling a transformer bobbin are provided. A transformer 10 includes a primary winding 40 and a secondary winding 50. The transformer 10 includes a core 20 made of a magnetic material, an insertion hole 32 for inserting the core 20, and the primary winding 40. A transformer bobbin 30 including a plurality of primary storage units 34 disposed and a plurality of secondary storage units 33 disposed with the secondary winding 50, and includes a plurality of primary storage units 34 and a plurality of primary storage units 34. The secondary storage unit 33 is provided integrally. [Selection] Figure 1

Description

  The present invention relates to a transformer and a bobbin for a transformer.

  There are types of transformers that combine a coil (secondary winding) formed by edgewise winding of a rectangular wire and a coil (primary winding) by winding an insulated wire such as an enameled wire. In such a type of transformer, for example, as shown in Patent Document 1, in order to improve the magnetic coupling, the insulated wire is divided into two parts to form a primary winding, and two windings of a rectangular wire are used. Some have adopted a laminated structure in which secondary windings are laminated.

JP 2003-17334 A

  By the way, in the configuration disclosed in Patent Document 1, the bobbin is divided for each secondary winding of edgewise winding and for each divided portion of the primary winding. Therefore, it is necessary to assemble the divided bobbins. Also, when assembling bobbins, it is difficult to improve the accuracy during assembly due to backlash of each bobbin, manufacturing variations, and the like.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a transformer and a transformer bobbin that can reduce the number of steps in assembling the transformer bobbin. It would be more desirable to provide a transformer and a transformer bobbin that can suppress a decrease in accuracy in the assembly of the transformer bobbin.

  In order to solve the above problems, one aspect of the transformer of the present invention is a transformer including a primary winding and a secondary winding, and includes a core formed of a magnetic material and an insertion hole into which the core is inserted. And a transformer bobbin including a plurality of primary storage units in which the primary windings are disposed and a plurality of secondary storage units in which the secondary windings are disposed, and the plurality of primary storage units and the plurality of primary storage units The secondary storage portion is provided integrally.

  Further, according to another aspect of the transformer of the present invention, in addition to the above-described invention, the transformer bobbin further has a main body having a crank-shaped cross section, and is recessed from the outer peripheral side to the insertion hole side of the main body. The primary winding portion is a primary storage portion in which the primary winding is arranged, and the primary winding is formed from the outer peripheral side of the primary storage portion so that the insulated wire having a circular cross section extends over the plurality of primary storage portions. The part that is formed by being wound and bulges outward from the insertion hole in the main body is a secondary storage part, and the secondary storage part has an outer peripheral wall with its outer peripheral side excluding the opening part. The secondary winding is formed by edgewise winding of a rectangular wire, and the secondary winding is arranged by being inserted into the secondary storage portion from the opening portion, Is preferred.

  Further, according to another aspect of the transformer of the present invention, in addition to the above-described invention, the transformer bobbin is further provided with a guide projection serving as a guide when the insulated wire is wound around the adjacent primary storage portion. The guide protrusion is preferably provided so as to protrude outward from the outer peripheral wall.

  In addition to the above-described invention, in another aspect of the transformer of the present invention, the outer peripheral wall is provided with an opening for allowing the secondary winding housed in the secondary housing to be inserted into the outside. It is preferable that

  Furthermore, in another aspect of the transformer of the present invention, in addition to the above-described invention, it is preferable that the bobbin for the transformer is provided with positioning means that functions as positioning when the core is attached.

  Another aspect of the transformer component according to the present invention is a transformer bobbin used for a transformer having a primary winding and a secondary winding. The transformer bobbin has an insertion hole for inserting a core. And a plurality of primary storage units in which primary windings are arranged, a plurality of secondary storage units in which secondary windings are arranged, and a plurality of primary storage units and a plurality of secondary storage units It is characterized by being provided integrally.

  According to the present invention, the number of steps in assembling the transformer and the bobbin for the transformer can be reduced.

1 is a perspective view showing an overall configuration of a transformer according to an embodiment of the present invention. It is side surface sectional drawing which shows the whole structure of the trans | transformer of FIG. It is a perspective view which shows the structure of the core in the trans | transformer of FIG. It is a perspective view which shows the structure of the bobbin in the transformer of FIG. 1, and is a figure which shows the state in which the primary winding and the secondary winding were attached. It is the perspective view which shows the structure which looked at the bobbin in the trans | transformer of FIG. 1 from the downward side.

  Hereinafter, a transformer 10 according to an embodiment of the present invention will be described with reference to the drawings.

  In the following description, the side of the flat wire 51 where the terminal 52 is located is the lower side (Z2 side), and the opposite side is the upper side (Z1 side). Further, the direction in which the secondary storage portion 33 and the primary storage portion 34 are arranged (the direction in which the insertion hole 32 extends) is the X direction, and the side where the upper positioning portion 38 is located in the bobbin 30 is the X2 side, and the opposite side is the side. X1 side. Further, the width direction of the bobbin 30 that is orthogonal to the X direction and the Z direction is the Y direction, and the right side in FIG. 1 is the Y1 side, and the opposite left side is the Y2 side.

  FIG. 1 is a perspective view showing the overall configuration of the transformer 10. FIG. 2 is a side cross-sectional view showing the overall configuration of the transformer 10. As shown in FIGS. 1 and 2, the transformer 10 includes a core 20, a bobbin 30, a primary winding 40, and a secondary winding 50 as main components.

  As shown in FIGS. 1 and 2, the transformer 10 includes a pair of cores 20, and the pair of cores 20 are attached to the bobbin 30 so as to face each other. FIG. 3 is a perspective view showing the configuration of the core 20. As shown in FIG. 3, the core 20 is a so-called ER core, and includes a bottom portion 21, a pair of peripheral walls 22 erected from each end portion in the longitudinal direction of the bottom portion 21, and a longitudinal direction of the bottom portion 21. It has a column base 23 standing from the center. In addition, the height which the surrounding wall 22 and the column base part 23 protrude from the bottom part 21 is provided in the same grade. The column base part 23 enters an insertion hole 32 of a bobbin 30 described later, and the bobbin 30 surrounding the insertion hole 32 enters a space between the peripheral wall 22 and the column base part 23.

  The core 20 is provided with a straight edge 21a and a concave edge 21b. The straight edge 21 a is a portion provided in a straight line among the edges along the longitudinal direction of the bottom 21. The straight edge 21a is provided so as to face the upper surface of a pedestal 37 that will be described later. The concave edge 21b is an edge of the bottom 21 opposite to the straight edge 21a, and the bottom 21 is cut into a concave shape so as to go to the column base 23 toward the center in the longitudinal direction of the bottom 21. It is provided in the missing shape. The concave edge portion 21b is provided to face the lower side of the upper positioning portion 38 described later.

  The core 20 is made of a magnetic material. Examples of the magnetic material include various magnetic materials such as nickel-based ferrite or manganese-based ferrite, permalloy, sendust, and various magnetic materials and various magnetic materials. It is possible to use a mixture of materials.

  Next, the bobbin 30 (corresponding to the transformer bobbin) will be described. The bobbin 30 is made of a resin having electrical insulation. FIG. 4 is a perspective view showing a configuration of the bobbin 30 and shows a state in which the primary winding 40 and the secondary winding 50 are attached. FIG. 5 is a perspective view showing a configuration of the bobbin 30 as viewed from below.

  As shown in FIGS. 2, 4, and 5, the bobbin 30 is provided with an insertion hole 32 that extends in the X direction and into which the column base portion 23 enters, and a main body 31 of the bobbin 30 so as to surround the insertion hole 32. Is provided. In addition, the bobbin 30 is integrally provided with a plurality of secondary storage portions 33 (four in the present embodiment) and primary storage portions 34 (three in the present embodiment).

  As shown in FIG. 2, the main body 31 of the bobbin 30 has a crank-shaped cross section in which portions close to and away from the insertion hole 32 alternately exist. A portion of the crank-shaped main body 31 that bulges outward from the insertion hole 32 is a secondary storage portion 33 that stores the secondary winding 50. The secondary storage part 33 is provided with a primary storage part 34 and a wall part 31a, which will be described later, spaced apart. Further, the secondary storage portion 33 communicates with the insertion hole 32, but the lower side (Z2 side) of the secondary storage portion 33 is provided to be opened. Therefore, the secondary winding 50 can be inserted from the opening side below the secondary storage portion 33.

  Further, a portion of the crank-shaped main body 31 that is recessed toward the insertion hole 32 is a primary storage portion 34 in which the primary winding 40 is disposed. Therefore, the primary storage part 34 is provided adjacent to the secondary storage part 33. In the present embodiment, the secondary storage unit 33 is provided on both sides of the primary storage unit 34, but a configuration in which the primary storage unit 34 is provided only on one side of the primary storage unit 34 may be adopted. Since the primary storage portion 34 is surrounded by the above-described wall portion 31a and the inner peripheral wall portion 31b that forms the insertion hole 32, the primary storage portion 34 is provided open to the outside and is not illustrated. It is possible to wind an insulated wire 41 (such as enameled wire) by a winding machine. Further, the primary winding 40 can be disposed in the primary storage portion 34 by winding the insulated wire 41. The inner peripheral wall portion 31b has a cylindrical shape that covers the insertion hole 32 over the entire circumference.

  As shown in FIGS. 2 and 3, the bobbin 30 is provided with a guide protrusion 35. The guide protrusion 35 is a protrusion for guiding the insulated wire 41. That is, when the insulated wire 41 is wound around the primary storage portion 34 by using a winding machine, and then the insulated wire 41 is wound around the adjacent primary storage portion 34, the insulated wire 41 is provided on the outer periphery of the guide protrusion 35. Is located. Then, by bending (bending) the insulated wire 41 along the outer periphery of the guide protrusion 35, the displacement of the insulated wire 41 can be prevented, and the insulated wire 41 is transferred to the adjacent primary storage portion 34, which is good. It is possible to perform simple winding. In the present embodiment, the guide protrusion 35 is provided on the outer peripheral wall portion 31c on the upper side (Z1 side) of the secondary storage portion 33, and is provided so as to protrude outward from the outer peripheral wall portion 31c. It has been.

  In the present embodiment, the guide protrusion 35 is provided in a columnar shape. In addition, two guide protrusions 35 are provided on the outer peripheral wall portion 31c of the two secondary storage portions 33 located on the center side (four in total). Thereby, the insulated wire 41 can be wound around the primary storage portion 34 in a state where the one end side and the other end side of the insulated wire 41 are not in contact with each other. However, any number of guide protrusions 35 may be provided.

  As shown in FIG. 4, an opening 36 is provided on the upper side of the main body 31. The opening 36 communicates the inside and the outside of the secondary storage part 33, and a part of the secondary winding 50 is visible from the outside through the opening 36. Further, the presence of the opening 36 allows heat generated in the secondary winding 50 to escape to the outside. In the present embodiment, a pair of openings 36 are provided in each secondary storage portion 33 so as to sandwich a portion where the guide protrusion 35 is provided. However, the number of openings 36 in the main body 31 may be any number.

  As shown in FIG. 4, the bobbin 30 is provided with a pedestal portion 37. The pedestal part 37 positions the lower side (Z2 side) of the core 20 attached to the bobbin 30. That is, the upper surface of the pedestal portion 37 is provided so as to face the linear edge portion 21a, thereby restricting the core 20 from moving downward (Z2 side). The pedestal portion 37 corresponds to positioning means.

  The bobbin 30 is provided with an upper positioning portion 38. The upper positioning part 38 positions the upper side (Z1 side) of the core 20. The presence of the upper positioning portion 38 restricts the core 20 from moving upward (Z1 side). The upper positioning portion 38 corresponds to positioning means.

  As shown in FIG. 4, the upper positioning portion 38 is provided in a box shape whose front side (X2 side) is open, and the lower side (Z2 side) corresponds to the above-described concave edge portion 21b. Although it protrudes downward as it goes to the center side in the direction (Y direction), the center side in the width direction (Y direction) is curved to follow the outer periphery of the column base 23. A through hole 38 a into which the insulated wire 41 can be inserted is provided above the upper positioning portion 38.

  As shown in FIG. 5, among the lower end sides of the secondary storage portion 33 of the bobbin 30, the two on the center side are located above the two on the end side. Therefore, at the time of mounting on the substrate, a space can be formed between the lower end of the central secondary storage portion 33 and the substrate.

  Further, as described above, the primary winding 40 is formed by winding the insulated wire 41 having a circular cross section around the primary storage portion 34. In the present embodiment, one insulated wire 41 is wound so as to straddle the three primary storage portions 34. For this reason, the primary winding 40 refers to a portion wound around the three primary storage portions 34, but there may be three independent primary windings 40.

  In the present embodiment, secondary winding 50 is formed by winding flat wire 51 by edgewise winding. And the secondary winding 50 is inserted from the opening of each secondary storage part 33, and the terminal 52 of the said secondary winding 50 is made into the state which protrudes from an opening.

<About manufacturing method>
A method for manufacturing the transformer 10 having the above configuration will be described below. First, the bobbin 30 is formed by resin injection molding. By such injection molding, the bobbin 30 in which the secondary storage portion 33 and the primary storage portion 34 are integrally provided is formed. Next, the insulated wire 41 is wound around the primary storage part 34 using a winding machine. At this time, a winding portion is formed in the three primary storage portions 34 by one insulated wire 41, and constitutes one primary winding 40 as a whole.

  When winding the insulated wire 41 using a winding machine, the end of the insulated wire 41 is inserted into the through hole 38a so that the end of the insulated wire 41 can be connected to an external power circuit or the like. .

  Next, the secondary winding 50 is inserted into the internal space of each secondary storage portion 33. Thereafter, the core 20 is inserted into the insertion hole 32 of the bobbin 30. At this time, the insertion hole 32 is inserted into the center hole of the secondary winding 50. At this time, as shown in FIG. 2, the cores 20 are inserted into the insertion holes 32 in a state where the column base portions 23 face (or abut) each other. In addition, when the column base parts 23 contact | abut, the column base parts 23 may contact directly, but you may contact indirectly through another member.

<About effect>
According to the transformer 10 having the above-described configuration, the bobbin 30 does not adopt a divided configuration for each edge-wise secondary winding 50 or each insulated wire 41, and a plurality of secondary storage units. 33 and a plurality of primary storage portions 34 are integrally provided. For this reason, unlike the prior art, the work of assembling the divided bobbins becomes unnecessary, and the number of steps in the assembly can be reduced.

  Further, since the bobbin 30 does not need to be assembled, it is not necessary to consider the backlash between the parts constituting the bobbin 30 or the manufacturing variation of the parts, which has occurred in the conventional assembly. . Therefore, when assembling the conventional bobbin 30, it is possible to suppress a reduction in assembly accuracy during assembly.

  Furthermore, in the present embodiment, the primary winding 40 and the secondary winding 50 are arranged by arranging the primary winding 40 in the primary storage portion 34 and the secondary winding 50 in the secondary storage portion 33. A sandwiched structure can be realized. Thereby, the magnetic coupling between the primary winding 40 and the secondary winding 50 can be improved.

  Further, in the present embodiment, the bobbin 30 has a main body 31 having a crank-shaped cross section. In addition, a portion of the main body 31 that is recessed from the outer peripheral side toward the insertion hole 32 is a primary storage portion 34 in which the primary winding 40 is disposed, and the primary winding 40 is an insulated wire having a circular cross section. It is formed by being wound from the outer peripheral side of the primary storage portion so that 41 extends over the plurality of primary storage portions 34. For this reason, it becomes easy to wind the insulated wire 41 using a winding machine, and the primary winding 40 can be easily formed.

  In addition, a portion of the main body 31 that bulges outward from the insertion hole 32 is a secondary storage portion 33. In addition, the outer peripheral side of the secondary storage portion 33 is covered by the outer peripheral wall portion 31c except for the opening portion, and the secondary winding 50 is formed by edgewise winding of the flat wire 51, and the secondary winding The line 50 is arranged by being inserted into the secondary storage portion 33 from the opening portion. For this reason, it becomes possible to arrange the secondary winding 50 in the secondary storage part 33 easily. Further, the secondary winding 50 can be easily positioned. Further, since the rectangular wire 51 is used to form the secondary winding 50, the direct current resistance (DCR) can be reduced.

  Further, in the present embodiment, the bobbin 30 is provided with a guide protrusion 35 that serves as a guide when the insulated wire 41 is wound around the adjacent primary storage portion 34. For this reason, when the insulated wire 41 is wound around the primary storage portion 34 by using a winding machine, and then the insulated wire 41 is wound around the adjacent primary storage portion 34, the insulated wire 41 is provided on the outer periphery of the guide protrusion 35. Can be positioned. Then, by bending (bending) the insulated wire 41 along the outer periphery of the guide protrusion 35, the displacement of the insulated wire 41 can be prevented, and the insulated wire 41 is transferred to the adjacent primary storage portion 34, which is good. It is possible to perform simple winding.

  In the present embodiment, the outer peripheral wall portion 31c of the bobbin 30 is provided with an opening 36 through which the secondary winding 50 housed in the secondary housing portion 33 is inserted into the outside. For this reason, the heat generated in the secondary winding 50 can be released to the outside through the opening 36. In particular, the bobbin 30 is formed of a resin having low thermal conductivity, and the secondary storage portion 33 is covered with such a resin wall portion 31a and an outer peripheral wall portion 31c. Therefore, the secondary storage part 33 is likely to accumulate heat, but due to the presence of the opening 36 as described above, the secondary winding 50 in the secondary storage part 33 rises in temperature by releasing heat to the outside. It is possible to suppress the occurrence.

  Further, in the present embodiment, the transformer bobbin is provided with a pedestal portion 37 that functions as a positioning when the core is attached, and is further provided with an upper positioning portion 38. For this reason, the core 20 is positioned by the pedestal portion 37 and the upper positioning portion 38. Thereby, the movement of the core 20 to the lower side (Z2 side) is restricted by the pedestal portion 37, and the movement of the core 20 to the upper side (Z1 side) is restricted by the upper positioning portion 38. Thereby, the core 20 can be easily attached to the bobbin 30.

<Modification>
Although one embodiment of the present invention has been described above, the present invention can be variously modified in addition to this. This will be described below.

  In the above-described embodiment, the case where the bobbin 30 is integrally provided with four secondary storage units 33 and three primary storage units 34 has been described. However, the number of secondary storage units 33 and primary storage units 34 may be any number as long as it is one or more. Further, in the above-described embodiment, the case where the bobbin 30 is formed by resin injection molding is described. However, the bobbin 30 may be formed by a technique other than resin injection molding. For example, it may be formed by additive manufacturing using a 3D printer, may be formed by powder molding, the bobbin 30 may be formed by cutting, or the bobbin 30 may be formed by welding or bonding each part. Alternatively, it may be formed by other various mechanical processing methods.

  In the above-described embodiment, the bobbin 30 is provided with the guide protrusion 35, the pedestal portion 37, and the upper positioning portion 38. However, a configuration in which at least one of these is not provided may be employed.

  In the above-described embodiment, the core 20 is described as an ER core. However, the core 20 is not limited to the ER core. For example, an E core may be used, an RM core may be used, an EP core may be used, a U core may be used, a pot core may be used, and a combination of E core and I core is used. Alternatively, a combination of a U core and an I core may be used, and various other cores may be used.

  In the above-described embodiment, the primary winding 40 is configured by winding the insulated wire 41 having a circular cross section. However, the primary winding 40 may be formed by winding a rectangular wire or other various cross-sectional shape wires. In the above-described embodiment, the secondary winding 50 is formed by winding the rectangular wire 51. However, the secondary winding 50 may be formed by winding an insulating conductor having a circular cross section or other various cross-sectional shapes.

  In the above-described embodiment, the primary storage unit 34 is located between the secondary storage units 33. However, a configuration in which there is a portion where the primary storage portion 34 is not located between the secondary storage portions 33 may be adopted. Similarly, in the present embodiment, the secondary storage unit 33 is located between the primary storage units 34, but there is a configuration where the secondary storage unit 33 is not located between the primary storage units 34. May be adopted.

DESCRIPTION OF SYMBOLS 10 ... Transformer, 20 ... Core, 21 ... Bottom part, 21a ... Straight edge part, 21b ... Concave edge part, 22 ... Peripheral wall, 23 ... Column base part, 30 ... Bobbin (corresponding to a bobbin for transformers), 31 ... Main body, 31a ... Wall part, 31b ... Inner peripheral wall part, 31c ... Outer peripheral wall part, 32 ... Insertion hole, 33 ... Secondary storage part, 34 ... Primary storage part, 35 ... Guide projection, 36 ... Opening part, 37 ... Base part, 38 ... Upper positioning portion, 38a ... through hole, 40 ... primary winding, 41 ... insulated wire, 50 ... secondary winding, 51 ... flat wire, 52 ... terminal

Claims (6)

A transformer comprising a primary winding and a secondary winding,
A core formed of a magnetic material;
A transformer bobbin including an insertion hole for inserting the core, a plurality of primary storage portions in which the primary winding is disposed, and a plurality of secondary storage portions in which the secondary winding is disposed;
Comprising
The plurality of primary storage units and the plurality of secondary storage units are provided integrally.
Transformer characterized by that. The transformer according to claim 1,
The transformer bobbin has a main body having a crank-shaped cross section,
The portion of the main body that is recessed from the outer peripheral side toward the insertion hole side is the primary storage portion in which the primary winding is disposed,
The primary winding is formed by being wound from the outer peripheral side of the primary storage portion so that the insulated electric wire having a circular cross section extends over the plurality of primary storage portions,
The portion of the main body that bulges outward from the insertion hole is the secondary storage portion, and the secondary storage portion is covered by the outer peripheral wall portion except for the opening portion on the outer peripheral side,
The secondary winding is formed by rectangular wire edgewise winding, and the secondary winding is disposed by being inserted into the secondary storage portion from the opening portion.
Transformer characterized by that. The transformer according to claim 2,
The transformer bobbin is provided with a guide projection serving as a guide when the insulated wire is wound around the adjacent primary storage portion, and the guide projection projects outward from the outer peripheral wall portion. Is provided as
Transformer characterized by that. The transformer according to any one of claims 1 to 3,
The outer peripheral wall portion is provided with an opening for allowing the secondary winding housed in the secondary housing portion to be inserted through the outside.
Transformer characterized by that. The transformer according to any one of claims 1 to 4,
The transformer bobbin is provided with positioning means that functions as positioning when the core is attached.
Transformer characterized by that. A transformer bobbin used in a transformer having a primary winding and a secondary winding,
This transformer bobbin
An insertion hole for inserting a core, a plurality of primary storage portions in which the primary winding is disposed, and a plurality of secondary storage portions in which the secondary winding is disposed,
The plurality of primary storage units and the plurality of secondary storage units are provided integrally.
A transformer bobbin characterized by that.

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