JP7063579B2 - Transformers and coil bobbins - Google Patents

Description

The present invention relates to a transformer, a coil bobbin used for the transformer, and the like.

As a conventional technique, a coil bobbin having a pair of iron core winding portions and a pair of connecting portions for connecting the iron core winding portions at a required interval, and having a concave groove on the entire outer circumference, and a concave groove of the coil bobbin. It is provided with a winding formed by winding a conducting wire around the coil bobbin a required number of times, and a wound iron core formed by winding an electromagnetic steel sheet around the iron core winding portion of the coil bobbin a required number of times. The coil bobbin has a curved surface having an arcuate cross section, and the coil bobbin includes a pair of iron core winding portions and a pair of connecting portions that connect the iron core winding portions at a required interval, and is the first winding. A second winding is provided with an outer frame having a first concave groove for providing a wire on the entire outer circumference, a pair of iron core winding portions, and a connecting portion for connecting the iron core winding portions at a required interval. The inner frame is provided in a pair with the outer frame so that the second concave groove is located inside the first concave groove. It was known that it was attached (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 8-51034 (Page 1, Fig. 1, etc.)

However, in a conventional transformer or the like that does not use an interlayer insulating film as described above, a primary coil, which is a coil on the high voltage side, is wound around the concave groove of the inner frame of the coil bobbin, and the concave groove of the outer frame is formed. Since the secondary coil, which is the coil on the low voltage side, is wound, there is a problem that the short-circuit impedance becomes high impedance and the voltage fluctuation rate becomes high.

Further, in such a transformer, when trying to obtain a transformer having a low impedance with little voltage fluctuation, the number of turns of the conducting wire per one layer of the coil (winding) is increased to increase the height of the coil. Is possible. The height of the coil is the length of the coil in the width direction of the concave groove around which each layer of the coil is wound. However, if the height of the coil is increased, the voltage between the layers of the coil becomes large, and there is a problem that the insulation between the layers of the coil cannot be sufficiently ensured.

As described above, in the conventional technique, there is a problem that low impedance cannot be achieved in a transformer that does not use an interlayer insulating film.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a transformer having a low impedance and a coil bobbin capable of manufacturing such a transformer.

The transformer of the present invention is provided in the first frame, the primary coil provided in the first frame, the second frame, and the second frame, and is arranged inside the primary coil. The first secondary coil, the third frame, the second secondary coil provided in the third frame, and the primary coil arranged inside, the primary coil, and the first secondary. A transformer comprising a coil and one or more wound iron cores provided to wind a second secondary coil.

With this configuration, the primary coil provided in the first frame is sandwiched between the two divided secondary coils provided in the second frame and the third frame, respectively, so that the transformer has low impedance. Can be obtained.

Further, in the transformer of the present invention, in the transformer, the first frame is a frame-shaped member in which the first groove around which the primary coil is wound is provided along the outer periphery, and is one or more. The second frame body is a frame-shaped member fitted inside the first frame body, and is a second groove around which the first secondary coil is wound. Is provided along the outer circumference, has a second side adjacent to each first side, and the third frame is a frame-shaped member in which the first frame is fitted inward. A third groove around which the second secondary coil is wound is provided along the outer circumference, has a third side adjacent to each first side, and the primary coil is the first groove. The first secondary coil is wound in the second groove, the second secondary coil is wound in the third groove, and one or more winding cores are wound on the first side. It is a transformer provided so as to involve one or more pairs of the first side and the adjacent second side and the third side, respectively.

With such a configuration, a transformer having low impedance can be obtained by sandwiching the primary coil between the secondary coils divided into two so as to be non-contact.

The coil bobbin of the present invention has a first frame body, which is a frame-shaped member in which a first groove around which a primary coil is wound is provided along the outer periphery, and a frame fitted inside the first frame body. A second frame in which a second groove around which the first secondary coil is wound is provided along the outer circumference, and a frame in which the first frame is fitted inward. A coil bobbin having a shape member, a third frame body in which a third groove around which a second secondary coil is wound is provided along the outer periphery thereof.

With such a configuration, it is possible to manufacture a transformer in which the primary coil is sandwiched between the secondary coils divided into two so as to be non-contact, and a transformer having low impedance can be obtained.

According to the present invention, it is possible to obtain a transformer having a low impedance and a coil bobbin capable of producing a transformer having a low impedance.

A perspective view of the transformer according to the embodiment of the present invention (FIG. 1 (a)), a perspective view of the transformer with the winding core omitted (FIG. 1 (b)), and Ic-Ic of FIG. 1 (b). Sectional view in line (FIG. 1 (c)) An exploded perspective view of the transformer A perspective view of the coil bobbin of the transformer (FIG. 3 (a)) and an exploded perspective view of the coil bobbin (FIG. 3 (b)). Schematic to explain the transformer

Hereinafter, embodiments of the transformer and the like will be described with reference to the drawings. In addition, since the components with the same reference numerals perform the same operation in the embodiment, the description may be omitted again.

(Embodiment)
FIG. 1 is a perspective view of a transformer according to the present embodiment (FIG. 1 (a)), a perspective view of the transformer in a state where the winding core is omitted (FIG. 1 (b)), and FIG. 1 (b). -Ic line is a cross-sectional view (FIG. 1 (c)).
FIG. 2 is an exploded perspective view of the transformer according to the present embodiment. In FIG. 2, the winding core is omitted.
FIG. 3 is a perspective view of the coil bobbin according to the present embodiment (FIG. 3 (a)) and an exploded perspective view of the coil bobbin (FIG. 3 (b)). In addition, in FIG. 3A and FIG. 3B, the cylindrical member is omitted.
FIG. 4 is a circuit diagram for explaining the transformer of the present implementation.

The transformer 1 includes a coil bobbin 10, a primary coil 104, a first secondary coil 105, a second secondary coil 106, and a wound iron core 108. The coil bobbin 10 includes a first frame body 101, a second frame body 102, a third frame body 103, and a cylindrical member 107.

The first frame body 101 is a frame-shaped member. Here, an example is a case where the front shape of the first frame 101 is a rectangular shape, and the outer and inner circumferences of the first frame 101 when viewed from the front are rectangular shapes with rounded corners. It will be explained by listing in. However, the corners do not have to be rounded. Further, the radius of curvature of the corner here does not matter. The first frame body 101 includes a pair of first sides 1012 parallel to each other and a pair of connecting portions 1013 parallel to each other to connect the pair of first sides 1012 at predetermined intervals. have. The first side 1012 has a shape extending linearly here. The first side 1012 may be considered as a pair of side portions parallel to each other of the first frame body 101, a member constituting a pair of parallel sides of the first frame body 101, and the like. The same applies to the second side 1022 and the third side 1032. The first side 1012 is a portion to be caught in the winding iron core 108 of the first frame body 101, and may be considered as, for example, a first iron core winding portion or the like. However, the first side 1012 may have another shape as long as it has a shape around which the wound iron core 108 can be wound. For example, the first side 1012 may have some curvature. .. The shape of the first frame body 101 may be a shape other than the above as long as it is a frame shape.

The first frame body 101 has a through hole 1014. The through hole 1014 is a hole into which the second frame body 102 is fitted. The through hole 1014 is, for example, a hole surrounded by a pair of first sides 1012 and a pair of connecting portions 1013. The through hole 1014 is, for example, a hole surrounded by the inner peripheral surface of the first frame body 101.

It should be noted that the front surface of the first frame body 101 is assumed here to be one of the opening surfaces provided with the through holes 1014 of the first frame body 101. The front surface of the first frame body 101 may be considered to be the visible side when the first frame body 101 is viewed from the width direction of the first groove 1011 described later. The same applies to the front surface of the second frame 102 and the third frame 103, which will be described later.

The first frame 101 is provided with a first groove 1011 around which the primary coil 104 is wound. The first groove 1011 is, for example, a groove extending in the circumferential direction of the first frame body 101. The first groove 1011 may be considered as, for example, a groove provided on the outer surface of the first frame body 101. Here, as an example, the case where the first groove 1011 is provided over the entire outer circumference of the first frame body 101 is shown. However, if the primary coil 104 can be wound, the first groove 1011 may not be provided over the entire outer circumference, and the first groove 1011 may not be partially provided. The primary coil 104 is usually a coil on the high voltage side of the transformer 1.

The first groove 1011 is, for example, a groove having a concave cross-sectional shape cut in the width direction. The cross-sectional shape may be any shape as long as it is concave, may be a shape having a step in the height direction, or may be a shape in which the bottom surface side or the side surface side is curved. The first groove 1011 has side walls 1015 on both sides (that is, the front side and the back side of the first frame body 101) along the first groove 1011. The side wall 1015 may or may not be provided along the entire first groove 1011. Here, the bottom surface 1016 of the first groove 1011 is flat, and the bottom surface side of the side wall 1015 of the first groove 1011 is inclined so that the width of the first groove 1011 becomes narrower toward the bottom surface 1016. A case where a portion other than the bottom surface side of 1015 is perpendicular to the bottom surface will be described as an example. The bottom surface 1016 of the portion of the first groove 1011 corresponding to the corner of the first frame 101 when viewed from the front has rounded corners. However, the corners do not have to be rounded. The side wall 1015 and the bottom surface 1016 of the first groove 1011 may be partially provided with notches, holes, or the like. For example, the side wall 1015 of the first groove 1011 may be provided with a notch or the like used for taking out a terminal (not shown) of the primary coil 104.

Inside the first groove 1011 is a dividing wall 1017 that divides the first groove 1011 in the width direction. Here, a case will be described in which only one dividing wall 1017 that divides the first groove 1011 into two equal parts in the width direction is provided in the first groove 1011. However, two or more dividing walls 1017 are provided. You may do it. Further, the dividing wall 1017 may not be provided. Further, the ratio of dividing the first groove 1011 into two in the width direction does not matter.

As shown in FIG. 3 and the like, the second frame 102 is a frame-shaped member fitted inside the first frame 101. The inside of the first frame body 101 is inside the through hole 1014 of the first frame body 101. The second frame 102 has, for example, a shape on the outer peripheral side when viewed from the front so as to fit inside the first frame 101.

Here, the case where the front shape of the second frame 102 is a rectangular shape and the front shape of the outer circumference and the inner circumference of the second frame 102 is a rectangular shape with rounded corners is taken as an example. explain. However, the corners do not have to be rounded. Further, the radius of curvature of the corner here does not matter. The second frame 102 has a pair of second sides 1022 parallel to each other and a pair of parallel connecting portions 1023 connecting the pair of second sides 1022 at predetermined intervals. are doing. The shape of the second frame 102 may be a shape other than the above as long as it is a frame that can be fitted inside the first frame 101.

The second frame 102 has a through hole 1024. The through hole 1024 is, for example, a hole surrounded by a pair of second sides 1022 and a pair of connecting portions 1023. The through hole 1024 is, for example, a hole surrounded by the inner peripheral surface of the second frame body 102.

The second side 1022 of the second frame 102 is adjacent to the first side 1012 of the first frame 101 with the second frame 102 fitted inside the first frame 101. It is the side to do. Here, one of the two second sides 1022 of the second frame 102 is adjacent to one of the two first sides 1012 of the first frame 101, and the other is the second side. The other of 1022 is adjacent. Adjacent here is a concept that includes a state in which the sides are in direct contact with each other and a state in which the sides are not in direct contact with each other, and a slight gap or the like may be provided between the sides. However, it is preferable that the sides are in direct contact with each other. The same applies to the adjacent first side 1012 and third side 1032. The second side 1022 has a shape extending linearly here. The second side 1022 is a portion to be caught in the winding iron core 108 of the second frame body 102, and may be considered as, for example, a second iron core winding portion or the like. However, the second side 1022 may have another shape as long as it has a shape around which the wound iron core 108 can be wound. For example, the second side 1022 may have some curvature. .. The shape of the second frame 102 may be a shape other than the above as long as it is a frame and can be fitted inside the first frame 101.

The fact that the second frame 102 is fitted inside the first frame 101 means that, for example, the second groove 1021 described later provided on the outer periphery of the second frame 102 is the first frame. It may be considered that the second frame 102 is arranged with respect to the first frame 101 so as to face the inner peripheral surface of the body 101.

Inside the first frame body 101, for example, a locking portion (not shown) for locking the second frame body 102 fitted from the front side of the first frame body 101 in a fitted state. May be provided. The locking portion is, for example, a protrusion provided on the back surface side inside the first frame body 101. Further, the outer peripheral side of the second frame body 102 may also have a shape that engages with the locking portion.

The second frame body 102 is provided with a second groove 1021 in which the first secondary coil 105 is arranged along the outer periphery thereof. The second groove 1021 is, for example, a groove extending in the circumferential direction of the second frame body 102. The second groove 1021 may be considered as, for example, a groove extending along the outer surface provided on the outer surface of the second frame 102. Here, a case where the second groove 1021 is provided over the entire outer circumference of the second frame body 102 will be described. The first secondary coil 105 will be described later.

The second groove 1021 is, for example, a groove having a concave cross-sectional shape cut in the width direction. The cross-sectional shape may be any shape as long as it is concave, may be a shape having a step in the height direction, or may be a shape in which the bottom surface side or the side surface side is curved. The second groove 1021 has side walls 1025 on both sides (that is, the front side and the back side of the second frame 102) along the second groove 1021. The side wall 1025 may or may not be provided along the entire second groove 1021. Here, a case where the bottom surface 1026 of the second groove 1021 is flat and the side wall 1025 of the second groove 1021 is perpendicular to the bottom surface will be described as an example. The side wall 1025 and the bottom surface 1026 of the second groove 1021 may be partially provided with notches, holes, or the like. For example, the side wall 1025 of the second groove 1021 may be provided with a notch or the like used for taking out a terminal (not shown) of the first secondary coil 105.

In the second groove 1021, a dividing wall (not shown) or the like that divides the second groove 1021 in the width direction may be provided.

The second frame 102 is fitted into the first frame 101 so that the center in the width direction of the first groove 1011 and the center in the width direction of the second groove 1021 are located in the same plane. It is preferable to be able to do so. For example, it is preferable to provide the above-mentioned locking portion or the like so as to be fitted in this way.

As shown in FIG. 3 and the like, the third frame 103 is a frame-shaped member into which the first frame 101 is fitted. The inside of the third frame 103 is inside the through hole 1034 of the third frame 103. The first frame body 101 has, for example, a shape that fits inside the third frame body 103.

Here, the case where the front shape of the third frame body 103 is a rectangular shape and the front shape of the outer circumference and the inner circumference of the third frame body 103 is a rectangular shape with rounded corners will be described as an example. do. However, the corners do not have to be rounded. Further, the radius of curvature of the corner here does not matter. The third frame 103 has a pair of third sides 1032 parallel to each other and a pair of parallel connecting portions 1033 connecting the pair of third sides 1032 at predetermined intervals. are doing.

The third frame 103 has a through hole 1034. The through hole 1034 is, for example, a hole surrounded by a pair of third sides 1032 and a pair of connecting portions 1033. The through hole 1034 is, for example, a hole surrounded by the inner peripheral surface of the third frame body 103.

The third side 1032 of the third frame 103 is adjacent to the first side 1012 of the first frame 101 with the first frame 101 fitted inside the third frame 103. It is the side to do. Here, one of the two second sides 1032 of the third frame 103 is adjacent to one of the two first sides 1012 of the first frame 101, and the other is the second side. The other of 1032 is adjacent. The third side 1032 has a shape extending linearly here. The third side 1032 is a portion to be caught in the winding iron core 108 of the third frame body 103, and may be considered as, for example, a third iron core winding portion or the like. However, the third side 1032 may have another shape as long as it has a shape around which the wound iron core 108 can be wound. For example, the third side 1032 may have some curvature. .. The shape of the third frame 103 may be a shape other than the above as long as it is a frame and the first frame 101 can be fitted inside.

The fact that the first frame 101 is fitted inside the third frame 103 means that, for example, the first groove 1011 provided on the outer periphery of the first frame 101 is the third frame 103. It may be considered that the first frame body 101 is arranged with respect to the third frame body 103 so as to face the inner peripheral surface of the above.

Inside the third frame 103, for example, a locking portion (not shown) for locking the first frame 101 fitted from the front side of the third frame 103 in a fitted state. May be provided. The locking portion is, for example, a protrusion provided on the back surface side inside the third frame body 103. The outer peripheral side of the first frame 101 may have a shape or the like that engages with the locking portion.

The third frame 103 is provided with a third groove 1031 along the outer periphery in which the second secondary coil 106 is arranged. The third groove 1031 is, for example, a groove extending in the circumferential direction of the third frame body 103. The third groove 1031 may be considered as, for example, a groove extending along the outer surface provided on the outer surface of the third frame 103. Here, an example is shown in which the third groove 1031 is provided over the entire outer circumference of the third frame body 103. The second secondary coil 106 will be described later.

The third groove 1031 is, for example, a groove having a concave cross-sectional shape cut in the width direction. The cross-sectional shape may be any shape as long as it is concave, may have a step in the height direction, or may have a shape in which the bottom surface side or the side surface is curved. The third groove 1031 has side walls 1035 on both sides (that is, the front side and the back side of the third frame body 1031) along the third groove 1031. The side wall 1035 may or may not be provided along the entire third groove 1031. Here, a case where the bottom surface 1036 of the third groove 1031 is flat and the side wall 1035 of the third groove 1031 is perpendicular to the bottom surface will be described as an example.

The width of at least the bottom surface side of the third groove 1031 is preferably the same as the width of the portion opposite to the bottom surface of the second groove 1021, but it does not have to be the same width. It is more important that the cross-sectional shape inside the third groove 1031 and the cross-sectional shape inside the second groove 1021 are substantially plane-symmetrical with respect to the plane parallel to the bottom surface of the first groove 1011. Although it is preferable, it may have a shape that is not substantially plane-symmetrical.

The side wall 1035 and the bottom surface 1036 of the third groove 1031 may be partially provided with notches, holes, or the like. For example, the side wall 1035 of the third groove 1031 may be provided with a notch or the like used for taking out a terminal (not shown) of the second secondary coil 106.

In the third groove 1031, a dividing wall (not shown) or the like that divides the third groove 1031 in the width direction may be provided.

The first frame body 101 is fitted into the third frame body 103 so that the center in the width direction of the first groove 1011 and the center in the width direction of the third groove 1031 are located in the same plane. It is preferable to be able to do so. For example, it is preferable to provide the above-mentioned locking portion or the like so as to be fitted in this way.

The third frame 103 has a fringe 1037 on the through hole 1034 side that extends outward in the width direction of the third groove 1031. Here, the fringe 1037 is provided so as to be perpendicular to the side wall 1035 of the third groove 1031. However, it does not have to be vertical. Here, an example is shown in which the fringe 1037 is provided along the inner peripheral surface of the third frame body 103. The fringe 1037 may be provided over the entire inner circumference of the third frame 103, or may be partially provided. Further, the fringe 1037 may be omitted. Further, the fringe 1037 may be provided with a partial notch or a hole. The fringe 1037 is a state in which the first frame 101 is fitted in the third frame 103, and the fringe 1037 and the inner peripheral surface of the third frame 103 make the first frame 101 the first. It is preferable to have a shape and a size capable of closing one groove 1011. However, there may be a part that is not blocked.

As described above, the first frame body 101 is fitted inside the third frame body 103, and the second frame body 102 is fitted inside the first frame body 101 to form the first frame body 101. , The second frame 102 and the third frame 103 are integrally assembled. Further, by being assembled, one second side 1022 of the second frame 102 and a third frame 1022 of the second frame 102 are used for each of the two first sides 1012 of the first frame 101. The third side 1032 of the 103 is adjacent to the third side 1032. Hereinafter, the first frame body 101, the second frame body 102, and the third frame body 103 assembled in this way are combined with the first frame body 101, the second frame body 102, and the like. And may be referred to as a third frame 103.

The width of the third groove 1031 of the third frame 103 is preferably equal to or less than the width of the first groove 1011 of the first frame 101. Further, the width of the second groove 1021 of the second frame body 102 is preferably equal to or less than the width of the first groove 1011 of the first frame body 101. Further, it is preferable that the width of the third groove 1031 of the third frame body 103 and the width of the second groove 1021 of the second frame body 102 are the same width.

The cylindrical member 107 is a cylindrical member. Both ends of the cylindrical member 107 are open in the longitudinal direction. As shown in FIG. 1 (b), the cylindrical member 107 includes the first side 1012 of the assembled first frame body 101, the second frame body 102, and the third frame body 103, and the first side thereof. It is arranged so as to enclose one or more pairs of a second side 1022 and a third side 1032 adjacent to one side 1012, respectively. Here, two cylindrical members 107 are arranged so as to wrap two sets of the first side 1012 and the second side 1022 and the third side 1032 adjacent thereto. Arranging so as to wrap may mean, for example, being arranged so as to be involved. It is preferable that both ends of the cylindrical member 107 in the longitudinal direction are completely open, but if insulating oil can flow in and out of the inside of the cylindrical member 107, both ends of the cylindrical member 107 are partially opened. You may have. Further, the cylindrical member 107 may have one or more openings (not shown) capable of inflow and outflow of insulating oil in the vicinity of both ends instead of having openings at both ends.

The cylindrical member 107 is a member that is wound around the wound iron core 108. The cylindrical member 107 is used, for example, to wind a steel sheet, which is a material for a wound steel core 108, such as an electromagnetic steel sheet, to produce a well-organized cylindrical wound steel core with less distortion, strain, and disorder in the winding method. Be done. The cylindrical member 107 may have one or more flat portions on the outer surface, that is, the outer peripheral surface, as long as it is possible to produce such a wound core, and the cylindrical member 107 may have one or more flat portions on the outer peripheral surface. It may have a concave portion or a convex portion, or may have one or more through holes, slits, notches, or the like, and at least a part thereof may have a mesh shape. Further, the cylindrical member 107 has a shape substantially similar to that of a cylinder, and if it is possible to produce a well-organized cylindrical wound core without distortion by winding a steel plate, the outer circumference thereof. The side may have a polygonal columnar shape.

The diameter and arrangement of the cylindrical member 107 are set so that, for example, the distance between the first side 1012, the second side 1022, and the third side 1032 arranged in the cylindrical member 107 and the cylindrical member 107 is as close as possible. It is preferable to have an appropriate diameter and arrangement. For example, at least a part of the first side 1012, the second side 1022, and the third side 1032 arranged inside the cylindrical member 107 have a diameter and arrangement so that the inner peripheral surface of the cylindrical member 107 contacts. Is preferable. The length of the cylindrical member 107 in the longitudinal direction does not matter. The length of the cylindrical member 107 in the longitudinal direction is set according to, for example, the width of the wound core 108, the length of the first side 1012, the second side 1022, the length of the third side 1032, and the like.

The cylindrical member 107 is composed of a pair of semi-cylindrical portions 1071a and a semi-cylindrical portion 1071b. The semi-cylindrical portion 1071a and the semi-cylindrical portion 1071b are members having a shape in which the cylindrical member 107 is divided into two so as to be symmetrical with respect to the plane having the axis of the cylindrical member 107, and the two semi-cylindrical portions 1071a. And the semi-cylindrical portion 1071b are combined to form a cylindrical member 107. The semi-cylindrical portion 1071a is arranged on the front side of the assembled first frame body 101, the second frame body 102, and the third frame body 103, and the semi-cylindrical portion 1071b is the assembled first frame body. It is arranged on the back side of the body 101, the second frame 102, and the third frame 103. The pair of semi-cylindrical portions 1071a and the semi-cylindrical portion 1071b are arranged so that two end portions 1072 extending along the longitudinal direction of each have opposite ends, and the two end portions 1072 are joined to each other by facing each other. , The semi-cylindrical portion 1071a and the semi-cylindrical portion 1071b are assembled to form a cylindrical member 107. The end 1072 may be considered as a joint surface. The semi-cylindrical portion 1071a and the semi-cylindrical portion 1071b do not necessarily have to have symmetrical shapes. For example, the semi-cylindrical portion 1071a and the semi-cylindrical portion 1071b are asymmetric with respect to the surface having the axial center of the cylindrical member 107, which is obtained by dividing the cylindrical member 107 into two by a surface having no axial center of the cylindrical member 107. It may be a member.

It does not matter how the pair of semi-cylindrical portions 1071a and 1071b are connected. The pair of semi-cylindrical portions 1071a and 1071b have, for example, connecting means (not shown) in the vicinity of the end portion 1072 or the end portion 1072, and the pair of semi-cylindrical portions 1071a and 1071b are connected by the connecting means. To. The connecting means is provided, for example, in the vicinity of the end portion 1072 of the semi-cylindrical portion 1071a and the semi-cylindrical portion 1071b at positions facing each other when the semi-cylindrical portion 1071a and the semi-cylindrical portion 1071b are assembled to form a cylindrical member 107. It is a set of a protrusion and a recess that fits into the protrusion. However, the pair of semi-cylindrical portions 1071a and 1071b may be bonded with an adhesive or the like, and the connecting means may be omitted if the connecting means does not need to be connected.

Although the case where the cylindrical member 107 is composed of the pair of semi-cylindrical portions 1071a and the semi-cylindrical portions 1071b has been described here, the cylindrical member 107 may be configured to assemble three or more members. good. Further, the cylindrical member 107 may have a structure other than the above as long as it can be arranged so as to wrap the pair of the first side 1012, the second side 1022, and the third side 1032. .. For example, the cylindrical member 107 may be composed of one member.

The coil bobbin 10 may have means used for positioning and fixing the cylindrical member 107. The means used for positioning and fixing may be of any configuration. For example, the cylindrical member 107 and at least a portion of the first side 1012, the second side 1022, and the third side 1032 are fitted with protrusions (not shown) for positioning and fixing. It is also possible to provide a recess to be provided.

The first frame body 101, the second frame body 102, the third frame body 103, and the cylindrical member 107 are made of a resin such as a thermoplastic resin, for example. The first frame body 101, the second frame body 102, the third frame body 103, and the cylindrical member 107 are, for example, resin molded products. The type of this resin does not matter. As this resin, for example, a resin used as a material for a coil bobbin used in an ordinary transformer or the like can be used. The first frame body 101, the second frame body 102, the third frame body 103, and the cylindrical member 107 may be the same resin, or at least a part thereof may be different resins. The first frame body 101, the second frame body 102, the third frame body 103, and the cylindrical member 107 may be made of a material other than resin.

In the present embodiment, the case where the coil bobbin 10 has the cylindrical member 107 has been described, but the cylindrical member 107 may be omitted.

The primary coil 104 is provided on the first frame body 101. The primary coil 104 is wound around the first groove 1011 of the first frame body 101, for example. The primary coil 104 is composed of a conducting wire 1041. As described above, the primary coil 104 is usually used as a coil on the high voltage side of the transformer 1. For example, the primary coil 104 is used as a coil on the high voltage side with respect to the secondary coil described later. The material of the conductor 1041 may be any material as long as it can be used for a normal transformer. The conductor 1041 used for the primary coil 104 is usually a conductor whose surface is insulated by an insulating film. The same applies to the conducting wire used for the secondary coil described later. The number of turns of the primary coil 104, the thickness of the conducting wire 1041, the cross-sectional shape, and the like do not matter.

As shown in FIG. 1 (c), the primary coil 104 is composed of a conducting wire 1041 that is aligned and wound in the first groove 1011. The primary coil 104 may be composed of one coil or may be composed of a plurality of coils. Here, as an example, it is assumed that the primary coil 104 is composed of the first to fifth coils (not shown). The number of turns of each of the first coil to the fifth coil does not matter.

The first to fourth coils are wound in order from the bottom in the front side portion of the first groove 1011 divided into two by the dividing wall 1017. For example, the first to fourth coils are wound in a layer on the bottom surface of the front side portion of the first groove 1011 divided into two. The first to fourth coils are wound in layers in order from the bottom surface side while being folded back between the side wall 1015 of the first groove 1011 and the dividing wall 1017. In FIG. 1 (c), for example, it is assumed that the right side facing FIG. 1 (c) is the front side.

The fifth coil is wound in order from the bottom on the back side portion of the first groove 1011 separated by the dividing wall 1017. For example, the fifth coil is wound in a layer on the bottom surface of the back surface side portion of the first groove 1011 divided into two. The fifth coil is wound in a layered manner from the bottom surface side while being folded back between the side wall 1015 of the first groove 1011 and the dividing wall 1017. The first to fourth coils may be wound on the back side, and the fifth coil may be wound on the front side.

The terminals (not shown) of the first coil to the fifth coil are all taken out from holes, notches, and the like (not shown) provided in the side wall 1015 of the second groove 1021.

It is preferable that the number of turns of the primary coil wound around each of the first grooves 1011 divided into two by the dividing wall 1017 is the same. Therefore, for example, it is preferable that the sum of the turns of the first to fourth coils and the turns of the fifth coil are the same.

The first secondary coil 105 and the second secondary coil 106 are coils used as the secondary coil of the transformer 1. It may be considered that the coil obtained by dividing the secondary coil of the transformer 1 into two is the first secondary coil 105 and the second secondary coil 106. The secondary coil is usually used as a coil on the low voltage side of the transformer 1.

The first secondary coil 105 is provided in the second frame body 102 and is arranged inside the primary coil 104. Here, as an example, the case where the first secondary coil 105 is wound around the second groove 1021 of the second frame body 102 is shown. However, the first secondary coil 105 may be provided in any way on the second frame body 102. The first secondary coil 105 is a multi-layer coil composed of a conducting wire 1051. The first secondary coil 105 is usually one coil, but may be a plurality of coils.

The second secondary coil 106 is provided in the third frame body 103, and the primary coil 104 is arranged inside the second secondary coil 106. Here, as an example, the case where the second secondary coil 106 is wound around the third groove 1031 of the third frame body 103 is shown. However, the second secondary coil 106 may be provided in any way on the second frame body 102. The second secondary coil 106 is a multi-layer coil composed of the conducting wire 1061. Normally, the same conductor is used as the conductor 1051 and the conductor 1061, but different conductors may be used. The second secondary coil 106 is usually one coil, but may be a plurality of coils.

In a normal transformer, the primary coil has a higher voltage than the secondary coil, and a larger current flows through the secondary coil. Therefore, the conductors 1051 and the second coil constituting the first secondary coil 105 and the second coil. As the lead wire 1061 constituting the secondary coil 106, a lead wire thicker than the lead wire 1041 constituting the primary coil 104 is used. However, the conductors constituting the primary coil 104 may be thicker than the conductors 1051 and the conductors 1061 constituting the secondary coil.

The terminal of the first secondary coil 105 (not shown) and the terminal of the second secondary coil 106 (not shown) are, for example, the side wall 1025 of the second groove 1021 and the third groove 1031. It is taken out from a hole provided in the side wall 1035 of the above, a notch, or the like (not shown). However, it does not matter how these terminals are taken out.

It is preferable that the number of turns of the conductor 1051 of the first secondary coil 105 and the number of turns of the conductor 1061 of the second secondary coil 106 are the same. By setting the number of turns to be the same, the voltage obtained from the first secondary coil 105 and the voltage obtained from the second secondary coil 106 can be set to the same voltage. When the voltage obtained from the first secondary coil 105 and the voltage obtained from the second secondary coil 106 are different voltages, the number of turns of each is set to be different depending on the voltage to be acquired. May be good.

When the number of turns of the lead wire 1051 of the first secondary coil 105 and the number of turns of the lead wire 1061 of the second secondary coil 106 are the same, the height of the first secondary coil 105 ( That is, the height in the width direction of the second groove 1021) and the height of the second secondary coil 106 (that is, the length in the width direction of the third groove 1031) may be the same height. , It does not have to be the same height. Further, the number of layers of the first secondary coil 105 (the length in the width direction of the second groove 1021) and the number of layers of the second secondary coil 106 (the length in the width direction of the third groove 1031). And may be the same number of layers, and may not be the same number of layers. Further, the cross-sectional shape perpendicular to the winding direction of the first secondary coil 105 and the cross-sectional shape perpendicular to the winding direction of the second secondary coil 106 are the bottom surface of the first groove 1011. It is preferable that the shape is plane-symmetrical with respect to a plane parallel to the plane, but the shape does not have to be a plane target. For example, the height and the number of layers of the coil may be changed between the first secondary coil 105 and the second secondary coil 106 so that the space factor of the coil is improved. Normally, the second secondary coil 106 arranged on the outside has a longer coil circumference than the first secondary coil 105 arranged on the inside, and is located between the primary coil and the secondary coil. Since the short-circuit impedance tends to be large, it is better to make the height of the second secondary coil 106 higher and the thickness thinner (the number of layers is smaller) than that of the first secondary coil 105. The magnitudes of the impedances of the secondary coil 105 and the secondary coil 106 can be made close to each other. Further, the cross-sectional shapes of the first secondary coil 105 and the second secondary coil 106 are also plane-symmetrical so as to improve the space factor, but if the space factor is improved, they are plane-symmetrical. It does not have to be the shape of. In the present embodiment, the number of turns of the conductor 1051 of the first secondary coil 105 and the number of turns of the conductor 1061 of the second secondary coil 106 are the same number of turns, and the height of the first secondary coil 105 is high. And the number of layers is the same as the height and the number of layers of the second secondary coil 106.

Further, the height of the first secondary coil 105 (the length in the width direction of the second groove 1021) and the height of the second secondary coil 106 (the length in the width direction of the third groove 1031) are , The height of the primary coil 104 (the length in the width direction of the first groove 1011) or less is preferable.

The winding method of the primary coil 104, the first secondary coil 105, and the second secondary coil 106 may be a winding method other than the above-mentioned aligned winding, and the winding method is not limited. The winding method of the primary coil 104, the first secondary coil 105 and the second secondary coil 106 shown in FIG. 1C and the like, the number of turns, the thickness of the conducting wire 1041, the conducting wire 1051 and the conducting wire 1061 and the like are shown. It is for illustration purposes only and may differ from that of the actual transformer 1.

The winding iron core 108 is the first side 1012 of the assembled first frame 101, the second frame 102, and the third frame 103, and the second side adjacent to the first side 1012. It is provided so as to involve one or more pairs of the second side 1022 and the third side 1032, respectively. The wound steel core 108 is formed by forming one or more sets of a first side 1012, a second side 1022 adjacent to the first side 1012, and a third side 1032, and a steel plate such as an electromagnetic steel plate (FIG. It is an iron core composed by winding (not shown). As the steel plate constituting the wound core 108, any steel plate may be used as long as it is a steel plate used for a normal wound core. The number of turns of the winding iron core 108 does not matter. Further, the thickness and width of the steel plate used for the wound iron core 108 are not limited.

The winding core 108 may be provided so as to be in direct contact with the pair of the first side 1012 and the second side 1022 and the third side 1032 adjacent to the first side 1012. It may be provided so as not to touch. In the present embodiment, the winding core 108 is arranged so as to enclose a pair of the first side 1012 and the second side 1022 and the third side 1032 adjacent to the first side 1012. The case where the winding iron core 108 is provided so as to wind the cylindrical member 107 and is not in direct contact with the first side 1012, the second side 1022, and the third side 1032 will be described. Since the configuration of the wound iron core 108 is a known technique, detailed description thereof will be omitted here. The number of turns of the wound core 108 shown in FIG. 1A, the steel plate used for the wound core 108, and the like are for the purpose of explanation, and may differ from those of the actual wound core 108.

FIG. 4 is a circuit diagram for explaining an example of the circuit configuration of the transformer 1 connected to the tap changer TL for explaining the transformer 1. In the figure, the circuit configuration of the transformer 1 corresponds to the portion shown by the dotted line. Here, a case where the transformer 1 is used as a step-down transformer is shown. However, the connection of the transformer 1 or the like may be a connection other than the connection shown in FIG. 4 as long as it can be used as a transformer.

In FIG. 4, the coils 21 to 25 are assumed to be the first to fifth coils constituting the above-mentioned primary coil 104.

The terminals (not shown) of the first to fifth coils constituting the primary coil 104 are taken out from the holes and notches (not shown) of the side wall 1015 of the first frame body 101, and are so-called taps. It is connected to the tap terminal of the switch TL.

The first terminal T ₁ of the first coil 21 is connected to the tap terminal P ₁ and has a second terminal (not shown) of the first coil 21 and a first terminal of the second coil 22 (not shown). The terminal T ₂ connected to the tap terminal P 2 (not shown) is connected to the tap terminal P ₂ and is connected to the second terminal (not shown) of the second coil 22 and the first terminal (not shown) of the third coil 23. The terminal T ₃ connected to (not shown) is connected to the tap terminal P ₃ and is connected to the second terminal (not shown) of the third coil 23 and the first terminal (not shown) of the fourth coil 24. The terminal T ₄ connected to the tap terminal P ₄ is connected to the tap terminal P 4. Any one of the tap terminals P ₁ to P ₄ is connected to the common terminal P _c by the switching piece TC. The common terminal P _c and the second terminal Q ₁ of the fifth coil 25 are the positive terminal BS1 (+) and the negative terminal BS1 (+) on the primary side provided in the container (not shown) in which the transformer 1 is housed, respectively. It is connected to the terminal BS1 (-) of. The second terminal (not shown) of the fourth coil 24 and the first terminal (not shown) of the _fifth coil 25 are connected by the terminal T5. It is assumed that a bushing is used here as the terminals BS1 (+) and BS1 (-) provided on the container (not shown). A high voltage with a potential difference of 6000 V or more is applied between the terminal BS1 (+) and the terminal BS1 (−) from the power system, for example. _In such a circuit configuration, tap switching is performed by moving the switching piece TC and changing the tap terminals P1 to _P4 connected to the common terminal Pc. The fourth coil 24 and the fifth coil 25 connected by the terminal T ₅ function as the main coil of the primary coil 104 that cannot be tap-changed.

It is assumed that the first secondary coil 105 and the second secondary coil 106 have a first terminal and a second terminal, respectively. The first terminal (not shown) of the first secondary coil 105 is a positive terminal BS2 (+) which is a terminal on the secondary side provided in the container (not shown) in which the transformer 1 is housed. The second terminal (not shown) of the first secondary coil 105 and the first terminal (not shown) of the second secondary coil 106 are a container in which the transformer 1 is housed. The second terminal (not shown) of the second secondary coil 106, which is connected to the ground terminal BS2 (G) provided in (not shown), is a container (not shown) in which the transformer 1 is housed. It is connected to the negative terminal BS2 (-), which is the terminal on the secondary side provided in). As the terminals BS2 (+), BS2 (G), and BS2 (-) provided on the container (not shown), it is assumed that a bushing (not shown) is used here. The terminal BS2 (+) outputs a low voltage of, for example, +100 to 110V to the terminal BS2 (G), and the terminal BS2 (-) outputs a low voltage of, for example, -100 to -110V to the terminal BS2 (G). Output voltage.

The transformer 1 is used by arranging it in an insulating oil (not shown). The transformer 1 is, for example, a so-called oil-filled transformer. For example, the transformer 1 and the tap changer TL are connected as shown in FIG. 4 and housed in a container (not shown) filled with insulating oil. The composition of the insulating oil does not matter.

Next, the manufacturing method of the transformer 1 will be briefly described. As shown in FIG. 2, the lead wire 1041 is wound around the first groove 1011 of the first frame body 101 to prepare the first frame body 101 around which the primary coil 104 is wound. Similarly, the lead wire 1051 is wound around the second groove 1021 of the second frame body 102 to produce the second frame body 102 around which the first secondary coil 105 is wound. Similarly, the lead wire 1061 is wound around the third groove 1031 of the third frame body 103 to produce the third frame body 103 around which the second secondary coil 106 is wound. As for the method of winding the conductor 1041, the conductor 1051, and the conductor 1061, for example, known techniques can be used.

The second frame 102 around which the first secondary coil 105 is wound is fitted into the through hole 1014 of the first frame 101 around which the primary coil 104 is wound. Further, the first frame body 101 into which the second frame body 102 is fitted is fitted into the through hole 1034 of the third frame body 103. As a result, the first frame body 101, the second frame body 102, and the third frame body 103 can be integrally assembled. The order in which the first frame body 101, the second frame body 102, and the third frame body 103 are assembled does not matter.

Next, the first side 1012 of the assembled first frame 101, the second frame 102, and the third frame 103, and the second side 1022 adjacent to the first side 1012 and The semi-cylindrical portion 1071a and the semi-cylindrical portion 1071b are arranged around the two sets with the third side 1032, respectively, and the two cylindrical members 107 are assembled by connecting them.

Then, by winding a steel plate (not shown) around each of the two cylindrical members 107 and providing the two wound iron cores 108, the transformer 1 as shown in FIG. 1A can be obtained. As a method for winding a steel sheet, a known technique can be used.

In the transformer 1 of the present embodiment, the primary coil 104 wound in the first groove 1011 provided on the outer periphery of the first frame 101 is fitted inside the first frame 101. The first secondary coil 105 wound in the second groove 1021 provided on the outer periphery of the second frame body 102, and the third frame body 103 in which the first frame body 101 is fitted inward. Since it is sandwiched by the second secondary coil 106 wound in the third groove 1031 provided on the outer periphery of the above, one primary coil 104 is divided into two, the first two. The structure is such that the secondary coil 105 and the secondary coil 106 are sandwiched so as not to be in contact with each other. As a result, the secondary coil is composed of the primary coil 104, the primary coil 105, and the secondary coil 106, as compared with the conventional transformer in which the secondary coil is arranged only on the outside of the primary coil. The magnetic coupling with the coil can be improved, and the short-circuit impedance of the transformer 1 can be made low impedance.

The shapes of the first frame body 101, the second frame body 102, and the third frame body 103 are the first side 1012 and the second side 1022 and the third side adjacent to the first side 1012. It is preferable that the shape is such that the gap between the set with the side 1032 and the inner peripheral surface of the wound iron core 108 provided around this set is reduced. When the transformer 1 has a cylindrical member 107, this gap is a set of a first side 1012 and a pair of second side 1022 and third side 1032 adjacent to the first side 1012. It may be considered as a gap between the inner peripheral surface of the cylindrical member 107 provided around this set.

Further, the shapes of the first frame body 101, the second frame body 102, and the third frame body 103 are such that the primary coil 104 is preferably inside the first groove 1011 located on the first side 1012. More preferably, the position that is the center in the width direction and the center in the depth direction inside the first groove 1011 in the wound portion, the portion where the separation wall 1017 is provided, or the like. Or at a position close to this, the winding iron core 108 wound around the pair of the first side 1012 and the second side 1022 and the third side 1032 adjacent to the first side 1012. It is preferable that the shape is such that the axis center of the winding is located.

As described above, according to the present embodiment, the primary coil 104 is sandwiched between the first secondary coil 105 and the second secondary coil 106, which are the secondary coils divided into two, so as to be non-contact. , Can provide a transformer with low impedance.

Further, the coil bobbin 10 that winds the primary coil 104 and the two secondary coils 105 and 106 is assembled with the independent first frame body 101, the second frame body 102, and the third frame body 103. With the configuration, each frame can be designed independently, which improves the degree of freedom in design. For example, each frame can be designed at low cost. Become.

Further, the coil bobbin 10 that winds the primary coil 104 and the two secondary coils 105 and 106 is assembled with the independent first frame body 101, the second frame body 102, and the third frame body 103. With the configuration, the primary coil 104 and the secondary coils 105 and 106 can be wound around each frame at the same time, the working time can be shortened, and the manufacturing cost can be reduced.

In the present embodiment, the case where the transformer 1 is an outer iron type transformer has been described as an example, but the transformer may be an inner iron type transformer.

Further, in the present embodiment, the case where the transformer 1 has two winding cores 108 has been described, but the transformer may have one winding core 108. In this case, the coil bobbin 10 may have at least one pair of the first side 1012 and the second side 1022 and the third side 1032 adjacent to the first side 1012, for example. , The first side 1012 and the second side 1022 and the third side 1032 adjacent to the first side 1012 may have only one pair. Further, even when the coil bobbin 10 has two pairs of the first side 1012 and the second side 1022 and the third side 1032 adjacent to the first side 1012, the coil bobbin 10 has two pairs thereof. The wound iron core 108 may be provided so as to involve only one of them.

Further, in the present embodiment, the case where the transformer 1 has the coil bobbin 10 has been described, but the transformer 1 has a primary coil 104 and a first secondary coil arranged inside the primary coil 104. The coil 105, the second secondary coil 106 in which the primary coil 104 is arranged inside, the primary coil 104, the first secondary coil 105, and the second secondary coil 106 are provided so as to be involved. If it is provided with one or more wound iron cores 108, even if it does not have the coil bobbin 10 (for example, even if a coil bobbin different from the coil bobbin 10 is used), the transformer has a low impedance as described above. A vessel can be provided. The portions of the primary coil 104, the first secondary coil 105, and the one winding core 108 of the second secondary coil 106 are, for example, one side of the frame-shaped primary coil 104 and one side thereof. One side of the frame-shaped first secondary coil 105 and one side of the frame-shaped second secondary coil 106 adjacent to the frame. The side here may be considered, for example, a portion where the conducting wire of each coil is wound in a straight line. However, it is preferable that the first secondary coil 105 is arranged inside the primary coil 104 so as to be non-contact. For example, it is preferable that the first secondary coil 105 is arranged inside the primary coil 104 so as to be non-contact via an insulating film, a part of the frame of the coil bobbin, or the like. Similarly, it is preferable that the primary coil 104 is arranged so as to be non-contact inside the second secondary coil 106. For example, it is preferable that the primary coil 104 is arranged inside the secondary coil 106 so as to be non-contact via an insulating film, a part of the frame of the coil bobbin, or the like. Further, it is preferable that the wound iron core 108 is also arranged so as not to be in contact with the primary coil 104, the first secondary coil 105, and the second secondary coil 106.

It goes without saying that the present invention is not limited to the above embodiments, and various modifications can be made, and these are also included in the scope of the present invention.

As described above, the transformer or the like according to the present invention is suitable as a transformer or the like provided with a wound iron core, and is particularly useful as a transformer or the like arranged in insulating oil.

1 Transformer 10 Coil bobbin 101 1st frame 102 2nd frame 103 3rd frame 104 Primary coil 105 1st secondary coil 106 2nd secondary coil 107 Cylindrical member 108 winding iron core 1011 1st Groove 1012 First side 1013, 1023, 1033 Connecting part 1014, 1024, 1034 Through hole 1015, 1025, 1035 Side wall 1016, 1026, 1036 Bottom surface 1017 Divided wall 1021 Second groove 1022 Second side 1031 Third groove 1032 Third side 1037 Fringe 1041, 1051, 1061 Lead wires 1071a, 1071b Semi-cylindrical part 1072 End part

Claims (2)

The first frame and
The primary coil provided in the first frame body and
The second frame and
A first secondary coil provided in the second frame and arranged inside the primary coil, and
With the third frame,
A second secondary coil provided in the third frame body in which the primary coil is arranged inside, and
The primary coil, the first secondary coil, and one or more cylindrical wound iron cores provided so as to wind the second secondary coil are provided .
The first frame body is provided with a first groove around which the primary coil is wound, along the outer periphery thereof.
The second frame is provided with a second groove along the outer periphery around which the first secondary coil is wound.
The third frame is provided with a third groove along the outer periphery around which the second secondary coil is wound.
The width of the second groove and the third groove is narrower than the width of the first groove,
A transformer in which the height of the second secondary coil is higher than that of the first secondary coil and the thickness is reduced . The first frame body is a frame -shaped member and has one or more first sides.
The second frame is a frame-shaped member fitted inside the first frame, and has a second side adjacent to each first side.
The third frame is a frame-shaped member in which the first frame is fitted inward, and has a third side adjacent to each of the first sides.
The primary coil is wound around the first groove and
The first secondary coil is wound around the second groove, and the first secondary coil is wound around the second groove.
The second secondary coil is wound around the third groove, and the second coil is wound around the third groove.
The one or more winding cores are provided so as to involve one or more pairs of the first side, the second side adjacent to the first side, and the third side, respectively. Item 1. The transformer according to item 1.

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