JP2006179727A - Transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology in which the improvement of a magnetic flux distribution in a magnetic core, an improvement in manufacturing workability, etc. are possible in a transformer. <P>SOLUTION: A first layer group in which a plurality of first layers are laminated which both ends of plate type magnetic materials are superposed mutually and by which they are made annular, and a plurality of second layers or this second layer by which both the ends of plate type magnetic material are alternately laminated. Moreover, the core is constituted independently from both of the first magnetic core which consists of both of the above first layer group, and the second magnetic core which consists of the above second layer group. <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.

  Examples of conventional techniques related to the present invention include those described in Japanese Patent Application Laid-Open No. 2002-83716 (Patent Document 1) and Japanese Patent Application Laid-Open No. 6-84656 (Patent Document 2). 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 type (butting type) joint, and a plurality of blocks on the outer layer of the wound core are provided with a joint part by an overlap type (superposition method). Japanese Patent No. 84656 discloses a technique in which all the joints are configured by a superposition method in order to provide a low-loss seam of an amorphous steel transformer core.

JP 2002-83716 A JP-A-6-84656

In the above prior art, in the transformer, when trying to realize the improvement of the magnetic flux distribution in the iron core, the securing of the effective cross-sectional area of the iron core and the improvement of the iron core manufacturing workability, further structural ingenuity is desired. .
In view of the situation of the above-described prior art, it is an object of the present invention to achieve, in a transformer, a combination of securing an effective cross-sectional area of an iron core, improving magnetic flux distribution in the iron core, and improving workability. It is.
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-mentioned problems, in the present invention, all or a part of the iron core of the transformer is formed into a ring shape in which both end portions of the first plate-like magnetic material are overlapped with each other. A first layer group in which a plurality of layers are laminated, and a second layer in which both ends of the second plate-shaped magnetic material are abutted with each other to form an annular shape, or a plurality of the second layers are laminated. The second layer group is alternately laminated. Moreover, it is set as the structure provided with both the iron core which consists of said 1st layer group, and the iron core which consists of said 2nd layer group as an iron core of a transformer.

  According to the present invention, in the transformer, it is possible to achieve the securing of the effective cross-sectional area of the iron core, the improvement of the magnetic flux distribution in the iron core, and the improvement of the iron core manufacturing workability.

Embodiments of the present invention will be described below with reference to the drawings.
FIGS. 1-2 is explanatory drawing of the 1st Example of this invention. FIG. 1 is a structural example diagram of a transformer as a first embodiment of the present invention, and FIG. 2 is a diagram showing an example of iron loss characteristics of the transformer of FIG. Fig.1 (a) is a side view of a transformer, FIG.1 (b) is an expanded sectional view of the junction part of an iron core. The first embodiment is a case of a two-leg type single-phase transformer.

In FIG. 1A, 100 is a transformer, 2 is an iron core for forming a transformer magnetic circuit, and 3a and 3b are exciting coils. The iron core 2 is, for example, a composite structure 0.2 in which dozens of amorphous thin plate materials (thin strip materials) having a thickness of about 0.02 × 10 ⁻³ m to 0.03 × 10 ⁻³ m are stacked. × ^{10 -3} m~0.6 × ¹⁰ -3 m approximately plate-shaped magnetic members, which are formed annularly in a plurality of layers stacked. A part of the plate-like magnetic material laminated in the plurality of layers forms an annular layer, i.e., a first layer, with both ends thereof being overlapped with each other. The portions are abutted against each other to form an annular layer, that is, a second layer.

FIG.1 (b) shows the expanded sectional structure of the junction part a of the iron core 2 in Fig.1 (a). In FIG. 1B, each of the plate-like magnetic materials a _{2 to} a ₆ forms an annular layer, that is, a first layer, with both end portions thereof being overlapped with each other, and the plate-like magnetic materials a _{2 to} a _6. Forms a first layer group (block) as a whole. Further, each of the plate-like magnetic materials a ₁ and a ₇ forms an annular layer, that is, a second layer, with both end portions thereof butting each other. In this laminated structure, the plate-like magnetic material a ₁ forming the first layer constitutes the innermost peripheral side of the annular iron core 2, and the plate-like magnetic material a ₇ constitutes the outermost peripheral side of the annular iron core 2. The plate-like magnetic materials a _{2 to} a ₆ that constitute and form the first layer group (block) are between the plate-like magnetic material a ₁ and the plate-like magnetic material a ₇ that form the first layer. It is arranged. That is, the first layer group (block) and the second layer are alternately stacked.

  FIG. 2 shows an example of an actual measurement result of iron loss characteristics of the iron core in the transformer 100 of FIG. In the iron loss characteristics of FIG. 2, the horizontal axis represents the average magnetic flux density in the iron core, and the vertical axis represents the iron loss. In FIG. 2, A is a first layer group (block) in which the iron core 2 of FIG. 1, that is, 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) is laminated. And the second layer (the layer in which both ends of the plate-like magnetic material are abutted against each other in an annular shape) are alternately laminated, and the iron loss characteristic of the iron core, B, a plurality of second layers are laminated It is the iron loss characteristic of the conventional iron core which consists of a 2nd layer group. The iron core 2 in the first embodiment shown in FIG. 1 has a plate-like magnetic material joined portion A having the structure shown in FIG. 1B, and the first layer group (block) and the second layer are alternately arranged. Due to the laminated structure, the magnetic flux density distribution in the iron core 2 is averaged in the cross section of the iron core as compared with the conventional iron core composed of the second layer group. For this reason, the effective cross-sectional area of a transformer magnetic circuit increases, magnetic resistance reduces, the amount of magnetic flux increases, and magnetic flux density increases. Therefore, the magnetic characteristic (BH characteristic) of the iron core 2 becomes a curve characteristic with less hysteresis than the conventional iron core, and the hysteresis loss is reduced. According to the actual measurement result of FIG. 2, the iron loss including the hysteresis loss of the iron core 2 is reduced by about 10% compared to the conventional case. Reduction of iron loss improves transformer efficiency. Moreover, since the joint structure of the second layer is easy to form the joint part, the workability of manufacturing the iron core is improved.

  According to the first embodiment of the present invention, in the transformer, it is possible to achieve the securing of the effective cross-sectional area of the iron core, the improvement of the magnetic flux distribution in the iron core, the improvement of the manufacturing workability of the iron core, and the like.

In the above-described first embodiment, the core 2 is, for example, several tens thickness ^{0.02 × 10 -3 m~0.03 × 10 -3} m of approximately amorphous thin material (Usuobizai) A plurality of laminated plate-like magnetic materials having a composite structure of about 0.2 × 10 ⁻³ m to 0.6 × 10 ⁻³ m are laminated and formed into an annular shape. In each case, each iron core has the same basic configuration.

  3-4 is explanatory drawing of the 2nd Example of this invention. FIG. 3 is a structural example diagram of a transformer as a first embodiment of the present invention, and FIG. 4 is a diagram showing an example of iron loss characteristics of an iron core in the transformer of FIG. 3A is a side view of the transformer, and FIGS. 3B and 3C are enlarged cross-sectional views of the joint portion of the iron core. The second embodiment is a case of a five-leg type three-phase transformer comprising four iron cores and three exciting coils.

In FIG. 3A, 100 is a transformer, 1a, 1b, 2a and 2b are iron cores for forming a transformer magnetic circuit, and 3a, 3b and 3c are excitation three-phase coils. In each iron core, a part of the plate-like magnetic material laminated in a plurality of layers forms an annular layer, i.e., a first layer, by overlapping both ends thereof, and others The two end portions are butted against each other to form an annular layer, that is, a second layer. The four iron cores 1a, 1b, 2a and 2b have three pairs of adjacent parts, that is, 1a ₂ and 2a ₁ , 2a ₂ and 2b ₁ , 2b ₂ and 1b ₁ , corresponding coils 3a, 3b and 3c, respectively. Excited in common (1a ₂ and 2a ₁ share the coil 3a, 2a ₂ and 2b ₁ share the coil 3b, and 2b ₂ and 1b ₁ share the coil 3c).

FIG. 3B shows an enlarged cross-sectional structure of the joints 1a and 2b of the iron cores 1a and 1b in FIG. 3A, and FIG. 3C shows the joints of the iron cores 2a and 2b in FIG. The enlarged cross-sectional structure of B and C is shown. In FIG. 3B, each of the plate-like magnetic materials a _{2 to} a ₆ forms an annular layer, that is, a first layer, by overlapping both ends thereof, and the plate-like magnetic materials a _{2 to} a _6. Forms a first layer group (block) as a whole. Each of the plate-like magnetic materials a ₁ and a ₇ forms an annular layer, that is, a second layer, with both end portions thereof butting each other. In this laminated structure, the plate-like magnetic material a ₁ forming the second layer constitutes the innermost peripheral side of the annular iron core 2, and the plate-like magnetic material a ₇ also forming the second layer is annular. The plate-like magnetic materials a _{2 to} a ₆ that constitute the outermost peripheral side of the iron core 2 and form the first layer group (block) are plate-like magnetic materials a ₁ and plate-like that form the second layer. It is arranged between the magnetic material a _7. That is, the first layer group (block) and the second layer are alternately stacked. Further, in FIG. 3C, each of the plate-like magnetic materials b _{2 to} b ₆ forms an annular layer, that is, a first layer, with both end portions thereof being overlapped with each other, and the plate-like magnetic material b _{2 to} b ₆ form a first layer group (block) as a whole. Further, each of the plate-like magnetic materials b ₁ and b ₇ is formed into a ring-shaped layer, that is, a second layer, with both ends thereof butting each other. In this laminated structure, the plate-like magnetic material b ₁ forming the second layer constitutes the innermost peripheral side of the annular iron core 2, and the plate-like magnetic material b ₇ also forming the second layer is annular. The plate-like magnetic materials b _{2 to} b ₆ constituting the outermost peripheral side of the iron core 2 and forming the first layer group (block) are plate-like with the plate-like magnetic material b ₁ forming the second layer. It is arranged between the magnetic material b _7. That is, the first layer group (block) and the second layer are alternately stacked.

In a transformer according to the second embodiment, the core 1a, 1b, respectively, the junction b of the plate-shaped magnetic material _a 1 ~a _7, two has the structure of FIG. 3 (b), also, the iron core 2a , respectively 2b, the junction of the plate-shaped magnetic members b ₁ ~b ₇ b, c has the configuration of FIG. 3 (c), the one of the core also both end portions of the first layer (plate-shaped magnetic material A first layer group (block) in which a plurality of layers that are overlapped with each other in a ring shape are stacked, and a second layer (a layer in which both ends of the plate-like magnetic material are butted against each other) As in the case of the first embodiment, the distribution of magnetic flux density in each iron core is a cross section of the iron core as compared with the case of the conventional iron core composed of the second layer group. And the effective cross-sectional area of the transformer magnetic circuit is increased. As a result, the magnetic resistance is reduced, the amount of magnetic flux is increased, and the magnetic flux density is increased. For this reason, the magnetic characteristic (BH characteristic) of each iron core becomes a characteristic of a curve with less hysteresis than the conventional iron core, and the hysteresis loss is reduced.

  FIG. 4 shows an example of an actual measurement result of iron loss characteristics of the iron core in the transformer 100 of FIG. In FIG. 4, A is the iron loss characteristic in the iron cores 1a, 1b, 2a, and 2b in FIG. 3, and B is the iron loss in the case of the conventional iron core in which all four iron cores are composed of the second layer group. It is a characteristic. According to the actual measurement result, the iron loss including the hysteresis loss in the iron cores 1a, 1b, 2a, and 2b in FIG. 3 is reduced by about 30 to 35% as compared with the conventional case. Reduction of iron loss increases the efficiency of the transformer. Further, the joint configuration of the second layer facilitates the formation of the joint and improves the workability of manufacturing the iron core.

  According to the second embodiment of the present invention, in the transformer, it is possible to achieve the securing of the effective cross-sectional area of the iron core, the improvement of the magnetic flux distribution in the iron core, the improvement of the manufacturing workability of the iron core, and the like.

  FIG. 5 is a configuration diagram of a transformer as a third embodiment of the present invention. Fig.5 (a) is a side view of a transformer, FIG.5 (b) and FIG.5 (c) are the expanded sectional views of the junction part of an iron core. The third embodiment is also a case of a five-leg type three-phase transformer comprising four iron cores and three exciting coils, but two of the four iron cores are made of plate-like magnetic material. The two end portions of the plate-shaped magnetic material are abutted against each other, and the other two iron cores are composed of a first layer group in which a plurality of first layers each having an annular shape are overlapped with each other. This is characterized in that the second layer group is formed by stacking a plurality of second layers formed into a ring shape.

In FIG. 5 (a), 1a, 1b, respectively, a first core, a first layer opposite ends of the plate-shaped magnetic material a ₁ ~a ₇ is superimposed to each other annularly formed by stacking a plurality first a layer group configurations, 2a, respectively 2b, a second core, a second layer opposite ends of the plate-shaped magnetic material b ₁ ~b ₈ is in abutted annular each other It is the structure which consists of 2nd layer group laminated | stacked by two or more. Reference numerals 3a, 3b, and 3c denote excitation three-phase coils. The four iron cores 1a, 1b, 2a, and 2b are composed of three pairs of adjacent parts, that is, 1a ₂ and 2a ₁ , 2a ₂ and 2b ₁ , 2b ₂ and 1b ₁ , respectively, of the coils 3a, 3b, and 3c. A corresponding one of them is shared and excited (1a ₂ and 2a ₁ share a coil 3a, 2a ₂ and 2b ₁ share a coil 3b, and 2b ₂ and 1b ₁ share a coil 3c).

FIG. 5B shows an enlarged cross-sectional structure of the joints a and d of the iron cores 1a and 1b in FIG. 5A, and FIG. 5C shows a joint of the iron cores 2a and 2b in FIG. The enlarged cross-sectional structure of B and C is shown. In FIG. 5B, each of the plate-like magnetic materials a _{1 to} a ₇ forms a first layer in which both end portions thereof are overlapped with each other to form an annular shape, and the plate-like magnetic materials a _{1 to} a ₇ are formed as a whole. As a result, a first layer group is formed. In FIG. 5C, each of the plate-like magnetic materials b _{1 to} b ₈ forms a second layer whose both ends are butted against each other to form a plate-like magnetic material b _{1 to} b _8. Forms the second layer group as a whole.

This in transformer of the third embodiment, since each core 1a, is 1b, the junction of the plate-shaped magnetic material a ₁ ~a ₇ b, d has a configuration of FIG. 5 (b), the As in the case of each embodiment, the magnetic flux density distribution in each of the iron cores 1a and 1b is averaged in the cross section of the iron core as compared with the case of the conventional iron core composed of the second layer group. The effective area of the magnetic circuit is increased. As a result, the magnetic resistance is reduced and the magnetic flux density is increased. For this reason, the magnetic characteristic (BH characteristic) of each iron core becomes a characteristic of a curve with less hysteresis than the conventional iron core, the hysteresis loss is reduced, and the overall iron loss is reduced. Reduction of iron loss increases the efficiency of the transformer. Further, since each core 2a, 2b are joined portion b of the plate-shaped magnetic members b ₁ ~b _8, Ha, as shown in FIG. 5 (b), has a joint configuration of the second layer, It is easy to form the joint and improves the workability of manufacturing the iron core.

  According to the third embodiment of the present invention as well, in the transformer, it is possible to achieve the securing of the effective cross-sectional area of the iron core, the improvement of the magnetic flux distribution in the iron core, the improvement of the iron core manufacturing workability, and the like.

FIG. 6 is a structural example diagram of a transformer as a fourth embodiment of the present invention. FIG. 6A is a side view of the transformer, and FIGS. 6B and 6C are enlarged sectional views of the joint portion of the iron core. The fourth embodiment, the four iron cores 1a, 1b, 2a, of 2b, the inner of the two iron cores 2a, 2b is a first core, respectively, the plate-shaped magnetic members _b 1 ~b ₇ Each of the two cores 1a and 1b is a second iron core, each of which is composed of a first layer group in which a plurality of first layers that are formed in an annular shape with both end portions of each other being overlapped with each other, The plate-like magnetic materials a _{1 to} a ₈ are configured by a second layer group in which a plurality of second layers that are annularly formed by abutting both ends of each other are laminated. Other configurations are the same as those of the third embodiment shown in FIG.

This in transformer of the fourth embodiment, since each core 2a, 2b are joined portion b of the plate-shaped magnetic members b ₁ ~b _7, c has the configuration of FIG. 6 (c), the As in the case of each embodiment, the magnetic flux density distribution in each of the iron cores 2a and 2b is averaged in the cross section of the iron core as compared with the case of the conventional iron core composed of the second layer group. The effective area of the magnetic circuit is increased. As a result, the magnetic resistance is reduced, the amount of magnetic flux is increased, and the magnetic flux density is increased. For this reason, the magnetic characteristic (BH characteristic) of each iron core becomes a curve characteristic with less hysteresis than the conventional iron core, and the hysteresis loss is reduced and the iron loss is reduced. Reduction of iron loss increases the efficiency of the transformer. Further, since each core 1a, is 1b, the junction b of the plate-shaped magnetic material a ₁ ~a _8, two are as in FIG. 6 (b), has a joint configuration of the second layer, It is easy to form the joint and improves the workability of manufacturing the iron core.

  According to the fourth embodiment of the present invention, in the transformer, it is possible to achieve the securing of the effective cross-sectional area of the iron core, the improvement of the magnetic flux distribution in the iron core, the improvement of the iron core manufacturing workability, and the like.

  FIG. 7 is a structural diagram of a transformer as a fifth embodiment of the present invention. Fig.7 (a) is a side view of a transformer, FIG.7 (b), FIG.7 (c) is an expanded sectional view of the junction part of an iron core. The fifth embodiment is an example of a three-leg type three-phase transformer comprising three iron cores and three exciting coils.

In FIG. 7A, 100 is a transformer, 4, 5a, 5b are iron cores, 3a, 3b, 3c are three-phase coils for excitation. The two iron cores 5 a and 5 b are arranged in a state where they are arranged in the annular region of the one iron core 4. In each of the iron cores 4, 5 a, 5 b, some of the plate-like magnetic materials laminated in a plurality of layers form an annular layer, that is, a first layer, whose both ends are overlapped with each other, In the other, both ends thereof are butted against each other to form an annular layer, that is, a second layer. The three iron cores 4, 5 a, 5 b are excited by a pair of adjacent parts of the iron core 4 and the iron core 5 a, that is, 4 a ₁ and 5 a ₁ , sharing the first coil 3 a, and the iron cores 5 a, 5 b A pair of adjacent parts, ie, 5a ₂ and 5b ₁ are excited by sharing the second coil 3b, and a pair of adjacent parts of the iron core 5b and the iron core 4 ie 5b ₂ and 4a ₂ are the third ones. In this configuration, the coil 3c is shared and excited.

FIG. 7B shows an enlarged cross-sectional structure of the joints 5a and 5b of the iron cores 5a and 5b in FIG. 7A, and FIG. 7C shows the connection to the joint of the iron core 4 in FIG. An enlarged sectional structure is shown. In FIG. 7 (b), the plate-shaped magnetic members a ₂ ~a ₆ are each, both ends thereof are overlapped with each other to form a layer or first layer is in an annular plate-shaped magnetic material a ₂ ~ a ₆ forms a first group of layers (block) as a whole. Each of the plate-like magnetic materials a ₁ and a ₇ forms an annular layer, that is, a second layer, with both end portions thereof butting each other. In this laminated structure, the plate-like magnetic material a ₁ that forms the second layer constitutes the innermost peripheral side of each of the annular iron cores 5a and 5b, and the plate-like magnetic material a ₇ that also forms the second layer. However, the plate-like magnetic materials a _{2 to} a ₆ constituting the outermost peripheral side of each of the annular iron cores 5a and 5b and forming the first layer group (block) are plate-like magnetic materials forming the second layer. It is arranged between the wood a ₁ and the plate-shaped magnetic members a _7. That is, in the iron cores 5a and 5b, the first layer group (block) and the second layer are alternately stacked. In FIG. 7C, each of the plate-like magnetic materials b _{2 to} b ₆ is formed into a ring-shaped layer, ie, a first layer, by overlapping both ends thereof, and the plate-like magnetic materials b ₂ to b ₆ b ₆ forms a first layer group (block) as a whole. Further, each of the plate-like magnetic materials b ₁ and b ₇ is formed into a ring-shaped layer, that is, a second layer, with both ends thereof butting each other. In this laminated structure, the plate-like magnetic material b ₁ forming the second layer constitutes the innermost peripheral side of the annular iron core 4, and the plate-like magnetic material b ₇ also forming the second layer is annular. The plate-like magnetic materials b _{2 to} b ₆ that constitute the outermost peripheral side of the iron core 4 and form the first layer group (block) are the plate-like magnetic material b ₁ that forms the second layer and the plate-like magnetic material b _1. It is arranged between the magnetic material b _7. That is, also in the iron core 4, the first layer group (block) and the second layer are alternately laminated.

This In the fifth embodiment, each core 5a, 5b, the bonding portion E of the plate-shaped magnetic members _a 1 ~a _7, the bets has a configuration of FIG. 7 (b), also, the iron core 4, the plate joint f of Jo magnetic material b ₁ ~b ₇ has a configuration of FIG. 3 (c), any of the core is also, both end portions of the first layer (plate-shaped magnetic material is superimposed to each other in a ring The first layer group (block) in which a plurality of layers) are stacked and the second layer (layers in which both end portions of the plate-like magnetic material are butted against each other) are alternately stacked. Therefore, as in the case of the first embodiment, the magnetic flux density distribution in each iron core is averaged in the core cross section compared to the case of the conventional iron core composed of the second layer group. The effective area of the transformer magnetic circuit is increased. As a result, the magnetic resistance is reduced, the amount of magnetic flux is increased, and the magnetic flux density is increased. For this reason, the magnetic characteristic (BH characteristic) of each iron core becomes a curve characteristic with less hysteresis than the conventional iron core, and the hysteresis loss is reduced and the iron loss is reduced. Reduction of iron loss increases the efficiency of the transformer. Further, the joint configuration of the second layer facilitates the formation of the joint and improves the workability of manufacturing the iron core.

  According to the fifth embodiment of the present invention, in the transformer, it is possible to achieve the securing of the effective cross-sectional area of the iron core, the improvement of the magnetic flux distribution in the iron core, the improvement of the iron core manufacturing workability, and the like. .

  FIG. 8 is a structural example diagram of a transformer as a sixth embodiment of the present invention. FIG. 8A is a side view of the transformer, and FIG. 8B and FIG. 8C are enlarged sectional views of the joint portion of the iron core. The sixth embodiment is also a case of a tripod type three-phase transformer comprising three iron cores and three exciting coils, as in the fifth embodiment, but the inner side of the three The two iron cores 5a and 5b are composed of a first layer group in which a plurality of first layers each having an annular shape in which both end portions of a plate-like magnetic material are overlapped with each other, The individual iron cores 4 are characterized in that they are composed of a second layer group in which a plurality of second layers each having an annular shape formed by abutting both end portions of a plate-like magnetic material are laminated.

In FIG. 8 (a), 5a, 5b, respectively, a first core, a first layer opposite ends of the plate-shaped magnetic material a ₁ ~a ₇ is superimposed to each other annularly formed by stacking a plurality 4 is a second iron core, and a plurality of second layers in which both end portions of the plate-like magnetic materials b _{1 to} b ₈ are abutted with each other are laminated. The second layer group. Reference numerals 3a, 3b, and 3c denote excitation three-phase coils. The three iron cores 4, 5 a, 5 b are excited by a pair of adjacent parts of the iron core 4 and the iron core 5 a, that is, 4 a ₁ and 5 a ₁ , sharing the first coil 3 a, and the iron cores 5 a, 5 b A pair of adjacent parts, ie, 5a ₂ and 5b ₁ are excited by sharing the second coil 3b, and a pair of adjacent parts of the iron core 5b and the iron core 4 ie 5b ₂ and 4a ₂ are the third ones. In this configuration, the coil 3c is shared and excited.

8B shows an enlarged cross-sectional structure of the joints 5a and 5b of the iron cores 5a and 5b in FIG. 8A, and FIG. 8C shows a joint of the iron cores 5a and 5b in FIG. 8A. The enlarged cross-sectional structure of F is shown. In FIG. 8B, each of the plate-like magnetic materials a _{1 to} a ₇ forms a first layer in which both end portions thereof are overlapped with each other to form an annular shape, and the plate-like magnetic materials a _{1 to} a ₇ are formed as a whole. As a result, a first layer group is formed. In FIG. 8C, each of the plate-like magnetic materials b _{1 to} b ₈ forms a second layer in which both end portions are butted against each other to form a plate-like magnetic material b _{1 to} b _8. Forms the second layer group as a whole.

This in transformers of the sixth embodiment, since the iron core 5a, the respectively 5b, junction E of the plate-shaped magnetic material a ₁ ~a _7, the bets has the structure of FIG. 8 (b), the As in the case of each embodiment, the magnetic flux density distribution in each of the iron cores 5a and 5b is averaged in the cross section of the iron core as compared with the case of the conventional iron core composed of the second layer group. The effective area of the magnetic circuit is increased. As a result, the magnetic resistance is reduced, the amount of magnetic flux is increased, and the magnetic flux density is increased. For this reason, the magnetic characteristic (BH characteristic) of each iron core becomes a characteristic of a curve with less hysteresis than the conventional iron core, the hysteresis loss is reduced, and the overall iron loss is reduced. Reduction of iron loss increases the efficiency of the transformer. Further, the iron core 4 is formed joint portions F of the plate-shaped magnetic members b ₁ ~b ₈ is, as shown in FIG. 8 (c), the order has a joint configuration of the second layer, the the joint portion It is easy to do and improves the workability of iron core production.

  According to the sixth embodiment of the present invention as well, in the transformer, it is possible to achieve the securing of the effective cross-sectional area of the iron core, the improvement of the magnetic flux distribution in the iron core, the improvement of the manufacturing workability of the iron core, and the like.

FIG. 9 is a structural example diagram of a transformer as a seventh embodiment of the present invention. 9A is a side view of the transformer, and FIGS. 9B and 9C are enlarged cross-sectional views of the joint portion of the iron core. Examples of the seventh, three core 4, 5a, 1 piece of the iron core 4 of the outer among 5b is a first core, both ends of the plate-shaped magnetic members b ₁ ~b ₇ from each other A structure composed of a first layer group in which a plurality of first layers that are overlapped to form an annular shape are laminated, and the two inner iron cores 5a and 5b are each a second iron core, and a plate-like magnetic material a a second layer both ends of ₁ ~a ₈ is abutted with the annular each other is constituted of a second group of layers which are stacked. Other configurations are the same as those of the sixth embodiment shown in FIG.

In the transformer according to the seventh embodiment, the iron core 4 has the configuration shown in FIG. 9C in the joint portions of the plate-like magnetic materials b _{1 to} b ₇ . Similarly to the case of the conventional iron core composed of the second layer group, the distribution of the magnetic flux density in each iron core 2a, 2b is averaged in the cross section of the iron core, and the transformer magnetic circuit is effectively disconnected. The area increases. As a result, the magnetic resistance is reduced, the amount of magnetic flux is increased, and the magnetic flux density is increased. For this reason, the magnetic characteristic (BH characteristic) of each iron core becomes a characteristic of a curve with less hysteresis than the conventional iron core, the hysteresis loss is reduced, and the overall iron loss is reduced. Reduction of iron loss increases the efficiency of the transformer. Further, since the iron core 5a, 5b respectively, the junction E of the plate-shaped magnetic material a ₁ ~a _8, is collected by, as shown in FIG. 9 (b), a joint structure of the second layer, It is easy to form the joint and improves the workability of manufacturing the iron core.

  According to the seventh embodiment of the present invention as well, in the transformer, it is possible to achieve the securing of the effective cross-sectional area of the iron core, the improvement of the magnetic flux distribution in the iron core, the improvement of the iron core manufacturing workability, and the like.

  In the second embodiment and the fifth embodiment, all of the plurality of iron cores are configured by alternately laminating the first layer group and the second layer made of a plate-like magnetic material. The present invention is not limited to this, and a part of the plurality of iron cores may be configured by alternately laminating the first layer group (block) and the second layer. In the second and fifth embodiments, the second layer is provided on the innermost and outermost sides of the annular iron core, and the first layer group is provided between the two second layers. However, the present invention is not limited to this, and the first layer or the first layer group (block) is disposed between the second layer group (block). Alternatively, the second layer or the second layer group (block) may be arranged between the first layers or between the first layer groups (blocks). Further, the first layer and the second layer may be alternately stacked one by one. Further, in a transformer using a plurality of iron cores, the iron cores are laminated by changing the combination of the first layer or the first layer group and the second layer or the second layer group for each iron core. Or an iron core in which a plurality of iron cores are laminated by combining the first layer or the first layer group and the second layer or the second layer group; A combination with an iron core consisting of only one layer group or an iron core consisting of only the second layer group may be used.

Further, in the above embodiments, the plate-shaped magnetic material constituting the iron core, for example, a thickness of ^{0.02 × 10 -3 m~0.03 × 10 -3} m of approximately amorphous thin material (Usuobizai However, the present invention is not limited to this, and each plate-like magnetic material may be composed of, for example, one sheet-like member. Other magnetic materials such as a silicon steel plate may be used. Further, the number of laminated plate-like magnetic materials is not limited to 7 layers or 8 layers in the above embodiment. Further, the number of coils and the excitation method are not limited to those in the embodiment.

It is an example of composition of the 1st example of the present invention. It is a figure which shows the iron loss characteristic example of the iron core in the transformer of FIG. It is a structural example figure of the 2nd Example of this invention. It is a figure which shows the iron loss characteristic example of the iron core in the transformer of FIG. It is an example of a structure of the 3rd Example of this invention. It is a structural example figure of the 4th Example of this invention. It is a structural example figure of the 5th Example of this invention. It is a structural example figure of the 6th Example of this invention. It is a structural example figure of the 7th Example of this invention.

Explanation of symbols

1a, 1b, 2, 2a, 2b, 4, 5a, 5b ... iron core,
3a, 3b, 3c ... coil,
100 ... transformer,
a _{1 to} a ₇ , b _{1 to} b ₇ ... first layer,
_{a 1 ~a 8, b 1 ~b} 8 ... the second layer.

Claims (5)

A transformer comprising an iron core formed by laminating a plurality of layers of a plate-like magnetic material and an annular coil, and an exciting coil,
As the iron core, a first layer group in which a plurality of first layers that are annularly formed by overlapping both end portions of the first plate-like magnetic material are laminated, and both end portions of the second plate-like magnetic material A transformer comprising: an iron core formed by alternately laminating a second layer or a second layer group in which a plurality of the second layers are laminated.   Four cores having the above-described laminated structure are provided, and three pairs of the four cores adjacent to each other are excited by sharing coils, or in the annular region of one core having the above-described laminated structure Two iron cores having the above-described laminated structure are arranged side by side, and one pair of adjacent one of the one iron core and the two iron cores is excited by sharing a first coil, A pair of adjacent portions of the two iron cores are excited by sharing the second coil, and the pair of adjacent ones of the other one of the two iron cores and the one iron core is the third. The transformer according to claim 1, wherein the coil is configured to be excited by sharing the coil. 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 iron core composed of a first layer group in which a plurality of first layers each having an annular shape in which both end portions of the first plate-shaped magnetic material are overlapped with each other, and a second plate shape A transformer comprising: a second iron core composed of a second layer group in which a plurality of second layers in which both end portions of a magnetic material are butted against each other are laminated.   The iron core includes two each of the first and second iron cores, and one of the first iron cores and one of the second iron cores are excited by sharing a first coil, and the second One of the iron cores and the other of the second iron core are excited by sharing the second coil, and the other of the second iron core and the other of the first iron core are excited by sharing the third coil. Or two of the second iron cores are arranged in an annular region of one of the first iron cores, and the first iron core and one of the second iron cores form the first coil. The second iron core and the other second iron core are excited by sharing the second coil, and the other second iron core and the first iron core are thirdly excited. The transformer according to claim 3, wherein the coil is configured to be excited by using a common coil. The transformer according to any one of claims 1 to 4, wherein the iron core has a configuration in which a plurality of thin plate materials are stacked on each other.

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