JP2005340463A - Transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for improving magnetic flux distribution and production workability inside the core of a transformer. <P>SOLUTION: A core comprises a first layer group formed by laminating a plurality of annular first layers overlapping both terminals of a first plate-like magnetic material with each other, and a second layer group formed by laminating a plurality of annular second layers abutting both terminals of a second plate-like magnetic material to each other. A plurality of the first or second layer groups are provided and both the layer groups are alternately disposed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a configuration of a transformer, and more particularly to a configuration of an iron core.

  As prior arts related to the present invention, for example, Japanese Patent Application Laid-Open No. 2002-83716 (Patent Document 1), Japanese Patent Application Laid-Open No. 9-237719 (Patent Document 2), Japanese Patent Application Laid-Open No. 9-246057 (Patent Document). There are those described in 3). In Japanese Patent Laid-Open No. 2002-83716, in a transformer core using an amorphous alloy ribbon, a plurality of inner layers of a wound core are provided in order to suppress an increase in core thickness and improve workability. A technique is described in which a block is provided with a butt-step lap (butting) joint, and a plurality of blocks on the outer layer of the wound core are provided with a joint by an overlap (superposition) method. No. 237719 discloses a technique in which the thickness of the unit laminated body provided on the inner peripheral side and the outer peripheral side is made thinner than the thickness of the unit laminated body provided in the intermediate portion in order to improve the magnetic characteristics of the amorphous wound core. In JP-A-9-246057, in order to improve the magnetic characteristics of an amorphous wound core, the unit core block located on the outer peripheral side of the core is joined to the unit laminated body. Technology to widen the spacing therebetween are described.

JP 2002-83716 A

JP-A-9-237719 Japanese Patent Laid-Open No. 9-246057

In the above-described prior art, in the transformer, when it is attempted to realize the improvement of the magnetic flux distribution in the iron core and the improvement of the iron core manufacturing workability, further structural ingenuity is desired.
The subject of this invention is enabling it to implement | achieve the improvement of magnetic flux distribution in an iron core, and the improvement of manufacturing workability | operativity in a transformer in view of the situation of the said prior art.
An object of the present invention is to solve the above-described problems and provide a transformer that is excellent in both performance and manufacturability.

  In order to solve the above-described problems, in the present invention, a transformer core is formed by laminating a plurality of first layers in which both end portions of a first plate-like magnetic material are overlapped to form an annular shape. And a second layer group formed by laminating a plurality of second layers in which both end portions of the second plate-shaped magnetic material are butted against each other, and the first layer group or A plurality of second layer groups are provided, and both layer groups are arranged alternately.

  ADVANTAGE OF THE INVENTION According to this invention, in a transformer, the improvement of the magnetic flux distribution in an iron core and the improvement of the manufacture workability of an iron core can be implement | achieved collectively.

Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.
1 to 3 are explanatory views of a first embodiment of the present invention. 1 is a structural example diagram of a transformer as a first embodiment of the present invention, FIG. 2 is a cross-sectional structural diagram of an iron core used in the transformer of FIG. 1, and FIG. 3 is a magnetic flux distribution in the iron core of FIG. It is explanatory drawing of.
In FIG. 1, 1 is a transformer, 2 is a coil for excitation, 2u is a U-phase coil, 2v is also a V-phase coil, 2w is also a W-phase coil, and 3 is a magnetic circuit. An iron core for forming, 4u is a terminal of a U-phase coil, 4v is a terminal of a V-phase coil, and 4w is a terminal of a W-phase coil. Core 3, a thickness of 0.02 × ^{10 -3} m~0.03 × ¹⁰ -3 thin plate of m about amorphous (Usuobizai) comprises piled dozens 0.2 × of the composite structure the ^{10 -3} m~0.6 × 10 ^-3 m approximately plate-shaped magnetic members laminated in multiple layers formed by molding the ring. Some of the plate-like magnetic materials laminated in the plurality of layers have both ends overlapped with each other to form a first layer, and the other part has both ends thereof. The parts are butted together to form a second layer, and the first layer is disposed on the innermost peripheral side.

FIG. 2 is a diagram showing a cross-sectional configuration of the iron core 3 used in the transformer of FIG.
In FIG. 2, a ₁ and a ₂ are respectively a first layer b ₁ , b ₂ , and b ₃ each having a second shape in which both end portions of the first plate-shaped magnetic material are overlapped with each other. A second layer in which both ends of the plate-like magnetic material are abutted against each other to form an annular shape, a is a _first layer group consisting of _first layers a ₁ and a ₂ , and b is a second layer b ₁ , B ₂ , b ₃ . In the first embodiment, in the iron core 3, the first layer group a including the _first layer a ₁ or the first layers a ₁ and a ₂ is provided on the innermost circumferential side of the ring. In the first layers a ₁ and a ₂ and the first layer group a, both end portions of the plate-like magnetic material are overlapped with each other and arranged on the innermost peripheral side, so that the magnetic path length is short. The magnetic resistance can be lowered, and the magnetic flux density can be increased accordingly.

FIG. 3 is an explanatory diagram of magnetic flux distribution in the iron core 3 of FIG.
In FIG. 3, A is the magnetic flux distribution characteristic of the AA 'portion in the iron core 3 of FIG. 2, and B is the first layer of the iron core (a layer formed by overlapping both end portions of the plate-like magnetic material). The magnetic flux distribution characteristics of the AA ′ portion in the case of the configuration in which the two layers are laminated, the iron core is formed by laminating the second layer (a layer in which both ends of the plate-like magnetic material are abutted with each other). It is the magnetic flux distribution characteristic of the AA 'part in the case of a structure. Characteristic A has a lower magnetic flux density than characteristic B, but because the number of overlapping parts (joints) at both ends of the plate-like magnetic material is small, it is easy to reduce the size of the transformer by reducing the iron core thickness. Easy to make.

  According to the first embodiment, in the transformer, the improvement of the magnetic flux distribution in the iron core and the improvement of the manufacturing workability of the iron core can be realized together.

FIG. 4 is an explanatory diagram of the second embodiment of the present invention, and shows a cross-sectional configuration of the iron core 3 used in the transformer as the second embodiment.
In FIG. 4, a ₁ and a ₂ are first layers b ₁ , b ₂ , b ₁ ′, and b ₂ ′ in which both ends of the first plate-like magnetic material are overlapped with each other to form an annular shape, respectively. A second layer in which both end portions of the second plate-like magnetic material are butted together to form an annular shape, a is a _first layer group consisting of _first layers a ₁ and a ₂ , and b is a first layer group The second layer group b ′ composed of _two layers b ₁ and b _{2 is a} second layer group composed of second layers b ₁ ′ and b ₂ ′. In the second embodiment, in the iron core 3, a second layer group b composed of the second layer b ₁ or the second layers b ₁ and b ₂ is provided on the innermost circumferential side of the ring. The second layer group b, the first layer group a, and the second layer group b ′ are alternately provided, and the second layer group b ′ is provided on the outermost peripheral side. By providing the first layer group a in the intermediate portion of the stack, the magnetic resistance of the magnetic circuit of the intermediate layer portion can be reduced and the magnetic flux density can be increased. Moreover, the increase in iron core thickness can be suppressed by making the innermost circumference side and the outermost circumference side into the first layer group.

  According to the second embodiment as well, in the transformer, it is possible to improve the magnetic flux distribution in the iron core and improve the workability of the iron core.

FIG. 5 is an explanatory diagram of the third embodiment of the present invention, and shows a cross-sectional configuration of the iron core 3 used in the transformer as the third embodiment.
In FIG. 5, b ₁ and b ₂ respectively represent second layers a ₁ , a ₂ , a ₁ ′, and a ₂ ′ in which both ends of the second plate-shaped magnetic material are butted against each other, A first layer in which both end portions of the first plate-like magnetic material are overlapped with each other to form a ring, a is a _first layer group composed of _first layers a ₁ and a ₂ , and b is a first layer The second layer group a ′ composed of the two layers b ₁ and b ₂ is a _first layer group composed of the first layers a ₁ ′ and a ₂ ′. In the third embodiment, in the iron core 3, the first layer group a including the _first layer a ₁ or the first layers a ₁ and a ₂ is provided on the annular innermost peripheral side. The first layer group a, the second layer group b, and the first layer group a ′ are alternately provided, and the first layer group a ′ is provided on the outermost peripheral side. By providing the second layer group b in the middle part of the stack and providing the innermost layer side, the outermost track side, and the second layer group of the stack, the difference in magnetic flux density in the thickness direction of the iron core can be reduced. . By providing the second layer group b, an increase in the core thickness can be suppressed.

  According to the third embodiment as well, in the transformer, it is possible to realize improvement of magnetic flux distribution in the iron core and improvement of iron core manufacturing workability.

  FIG. 6 is an explanatory diagram of the fourth embodiment of the present invention, and shows a cross-sectional configuration of the iron core 3 used in the transformer as the fourth embodiment. In the present embodiment, as in the first embodiment, the first layer (the layer in which both end portions of the plate-like magnetic material are overlapped with each other to form an annular shape) is arranged on the inner peripheral side, and the second layer (plate-like) is formed. A layer in which both end portions of the magnetic material are butted against each other is provided on the outer peripheral side, and a portion where both end portions of a part of the first layer are overlapped is provided in the corner portion.

In FIG. 6, a ₁ , a ₂ , a ₃ , and a ₄ are respectively a first layer in which both end portions of the first plate-like magnetic material are overlapped with each other to form a ring, and b ₁ is a second plate. A second layer in which both ends of the magnetic material are butted against each other, a is a _first layer group consisting of _first layers a ₁ , a ₂ , a ₃ , a ₄ , b is a first layer This is a second layer group consisting of two layers b ₁ . A portion where both end portions of the first layer a ₁ are overlapped is provided at the corner portion C ₁ , and a portion where both end portions of the first layer a ₄ are overlapped is also provided at the corner portion C ₂ . By providing the joint portion (overlapping portion at both ends) of the first layer at the corner portion, an increase in the iron core thickness can be suppressed. In addition, since the first layers a ₁ , a ₂ , a ₃ , a ₄ and the first layer group a are provided on the inner peripheral side, the magnetic flux density can be increased as a whole.

  According to the fourth embodiment as well, in the transformer, it is possible to realize both improvement of the magnetic flux distribution in the iron core and improvement of iron core manufacturing workability.

  FIG. 7 is an explanatory diagram of the fifth embodiment of the present invention, and shows a cross-sectional configuration of the iron core 3 used in the transformer as the fifth embodiment. In this embodiment, the entire layer is composed of a first layer (a layer in which both end portions of a plate-like magnetic material are overlapped with each other to form an annular shape), of which a portion where both ends are overlapped (joining) Part) is distributed in two corners, and the joints in the innermost and outermost layers are provided in the same corner.

In FIG. 7, a ₁ , a ₂ , a ₃ , a ₄ , and a ₅ are respectively a first layer in which both ends of the plate-like magnetic material are overlapped with each other to form a ring, and a is a first layer a ₁ , a ₂ , a ₃ , a ₄ , a ₅ , a first layer group. A portion (joint portion) where both end portions of the first innermost layer a ₁ on the innermost peripheral side and the first layer a ₅ on the outermost peripheral side are overlapped is the corner portion C ₁ and both ends of the first layer a ₄ are also the same. part (junction) which part is superimposed is provided in a corner portion C _2. By providing the joint portion (overlapping portion at both ends) of the first layer at the corner portion, an increase in the iron core thickness can be suppressed. Moreover, since all the layers are composed of the first layers a ₁ , a ₂ , a ₃ , a ₄ , and a ₅ , the magnetic flux density can be increased as a whole.

FIG. 8 is an explanatory diagram of the sixth embodiment of the present invention.
In FIG. 8, a ₁ , a ₂ , a ₃ , a ₄ , and a ₅ are first layers b ₁ , b ₂ in which both end portions of the first plate-like magnetic material are overlapped with each other to form an annular shape. , B ₃ are second layers in which both end portions of the second plate-shaped magnetic material are butted against each other, and a is a _first layer a ₁ , a ₂ , a ₃ , a ₄ , a the first group of layers consisting of _5, b is a second group of layers consisting of the second layer _{b 1,} b 2, _{b 3.} A portion where both end portions of the first layer a ₁ are overlapped is provided at the corner portion C ₁ , and a portion where both end portions of the first layer a ₅ are overlapped is also provided at the corner portion C ₂ . By providing the joint portion (the overlapping portion at both ends) of the first layer at the corner portion, an increase in the iron core thickness can be suppressed. In addition, since the first layers a ₁ , a ₂ , a ₃ , a ₄ , a ₅ and the first layer group are provided on the outer peripheral side, the magnetic flux distribution of the entire iron core can be made close to uniform. In addition, with the above configuration, the workability of manufacturing the iron core can be improved.

  As described above, according to each of the fifth and sixth embodiments, improvement of magnetic flux distribution in the iron core and improvement of iron core manufacturing workability can be realized in the transformer.

  Note that, as in the fourth, fifth, and sixth embodiments, the configuration in which the portion (joint portion) where both end portions are overlapped in each layer is arranged in the corner portion is the same as in the second and third embodiments. Thus, the present invention can also be applied to a configuration in which the first layer group and the second layer group are alternately arranged. In this case, a part of the first layers in the first layer group or all of the joint portions of the first layers are arranged, for example, dispersed in a plurality of corner portions. The plate-like magnetic material forming the iron core is not limited to a composite structure in which dozens of amorphous thin plate materials (thin strip materials) are stacked, and may be other magnetic materials such as silicon steel plates. .

1 is a configuration example diagram of a transformer as a first embodiment of the present invention. FIG. It is a cross-sectional block diagram of the iron core used for the transformer of FIG. It is explanatory drawing of the magnetic flux distribution in the iron core of FIG. It is explanatory drawing of the 2nd Example of this invention. It is explanatory drawing of the 3rd Example of this invention. It is explanatory drawing of the 4th Example of this invention. It is explanatory drawing of the 5th Example of this invention. It is explanatory drawing of the 6th Example of this invention.

Explanation of symbols

1 ... Transformer,
2 ... Coil,
3 ... Iron core,
a ₁ , a ₂ , a ₃ , a ₄ , a ₅ , a ₁ ′, a ₂ ′ —first layer,
b ₁ , b ₂ , b ₃ , b ₁ ', b ₂ ' ... second layer,
a ... first layer group,
b ... second layer group,
C ₁ , C ₂ ... corner portion.

Claims (6)

A transformer comprising an iron core formed by laminating a plurality of layers of a plate-like magnetic material and formed into an annular shape, and an exciting coil,
The iron core includes a first layer in which both end portions of the first plate-shaped magnetic material are overlapped with each other to form an annular shape, and a second layer in which both end portions of the second plate-shaped magnetic material are in contact with each other to form an annular shape. And the first layer is disposed on the innermost peripheral side. A transformer comprising an iron core formed by laminating a plurality of layers of a plate-like magnetic material and formed into an annular shape, and an exciting coil,
The iron core includes a first layer group formed by laminating a plurality of first layers in which both end portions of the first plate-like magnetic material are overlapped with each other, and both end portions of the second plate-like magnetic material. And a second layer group formed by laminating a plurality of second layers that are butted against each other, a plurality of the first layer groups or the second layer groups are provided, and both the layer groups are Transformers characterized by alternating configurations.   When the innermost circumferential side is the first layer group, the iron core is also arranged on the outermost circumferential side. When the innermost circumferential side is the second layer group, the iron core is also disposed on the outermost circumferential side. The transformer according to claim 2, wherein two layer groups are arranged.   4. The transformer according to claim 1, wherein the iron core has a composite structure in which the first and second plate-like magnetic materials are each formed by stacking a plurality of thin plate materials.   4. The transformer according to claim 1, wherein the iron core has a configuration in which the first layer is configured such that overlapping portions of both end portions of the first plate-like magnetic material are arranged at corner portions. 5. A transformer comprising an iron core formed by laminating a plurality of layers of a plate-like magnetic material and formed into an annular shape, and an exciting coil,
A transformer characterized in that the iron core includes a layer in which both end portions of a plate-like magnetic material are overlapped with each other to form an annular shape, and the overlapping portion of both end portions is arranged at a corner portion.

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