A three-dimensional wound core transformer

Abstract

This utility model discloses a three-dimensional wound core transformer, including three-phase coils (A, B, and C), a winding jig, and magnetic material. Each phase coil includes a low-voltage coil and a high-voltage coil. The low-voltage coil is wound into an elongated oval structure with a central rectangular frame and symmetrical semicircles at both ends. The high-voltage coil is wound around the low-voltage coil. The three-phase coils are arranged such that the left side of phase A coil is joined to the right side of phase B coil, the left side of phase B coil is joined to the right side of phase C coil, and the left side of phase C coil is joined to the right side of phase A coil, forming a three-frame, three-column three-phase coil consisting of three frames and three columns. The three frames of the three-frame, three-column three-phase coil are located at the vertices of an equilateral triangle. The magnetic material is wound around the three columns of the three-frame, three-column three-phase coil, forming a structure in which the high- and low-voltage coils are surrounded by magnetic material. This transformer, through its unique coil winding structure and magnetic material assembly method, optimizes the magnetic field path. Its manufacturing process is simple and can be automated using existing processes and molds. It provides a more efficient and economical solution for energy saving, cost reduction, and high-power transformer applications.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a three-dimensional wound core transformer. Background Technology

[0002] Transformers, as core equipment in power grids and power systems, utilize the principle of electromagnetic induction to transform AC voltage, undertaking key functions such as voltage, current, and impedance transformation, as well as isolation and voltage stabilization. They consist of an iron core (or magnetic material) and coils. From the perspective of iron core structure, they can be divided into two categories: laminated cores and wound cores. Laminated cores are planar arranged and include core-type and shell-type. Core-type transformers have a circular cross-section core column, placed vertically, with the coils concentrically nested within the core column; shell-type transformers have a core surrounding the coils, with a rectangular cross-section core column, placed horizontally. Although both are structurally simple and easy to standardize, the mating assembly of the yoke and the core column can easily lead to uneven magnetic fields, noise, and vibration under high magnetic flux density, and increasing the cross-sectional area increases costs. The core is wound along the optimal magnetic conductivity direction of the grain-oriented silicon steel sheet, resulting in minimal magnetic circuit distortion, no seams or air gaps, and excellent no-load performance. It is further subdivided into planar wound cores (triangular structure, high mechanical strength, strong short-circuit resistance, and low no-load loss) and three-dimensional wound cores (three single-frame assembly, no sharp corner seams, low magnetic reluctance, and large no-load current reduction). However, the winding process requires high precision, has poor mold versatility, and is difficult to manufacture and maintain. In the current pursuit of energy conservation, material saving, and environmental protection, improving the core structure has become a key aspect of research and development.

[0003] This utility model of a three-dimensional wound core transformer overturns the traditional "coil-wound core" model and innovatively adopts the approach of "winding the coil first and then winding the magnetic material." It inherits the advantages of wound cores while simplifying the manufacturing process. It can be adapted to existing technologies and molds to achieve automated production. It shows significant advantages in terms of structure, energy saving, and cost, providing a new path for transformer technology upgrading and industry development, and promoting power equipment towards a more efficient, economical, and green direction. Summary of the Invention

[0004] The purpose of this invention is to provide a three-dimensional wound core transformer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a three-dimensional wound core transformer, comprising an A-phase coil, a B-phase coil, a C-phase coil, a winding jig, and magnetic materials. The A-phase coil includes a first low-voltage coil and a first high-voltage coil. The first low-voltage coil is wound into an elongated oval structure with a cross-section of a rectangular frame in the middle and symmetrical semicircles at both ends. The first high-voltage coil is wound outside the first low-voltage coil.

[0006] The B-phase coil includes a second low-voltage coil and a second high-voltage coil. The second low-voltage coil is wound with the same cross-sectional structure as the first low-voltage coil, and the second high-voltage coil is wound outside the second low-voltage coil.

[0007] The C-phase coil includes a third low-voltage coil and a third high-voltage coil. The third low-voltage coil is wound into an elongated oval structure with a central rectangular frame and symmetrical semicircles at both ends. The third high-voltage coil is wound outside the third low-voltage coil.

[0008] The left side of the A-phase coil is joined to the right side of the B-phase coil, the left side of the B-phase coil is joined to the right side of the C-phase coil, and the left side of the C-phase coil is joined to the right side of the A-phase coil, forming a three-frame, three-column, three-phase coil consisting of three frames and three columns.

[0009] The three frames of the three-frame, three-column, three-phase coil are all oblong in cross-section, with the middle part tangent to the semicircles at both ends.

[0010] The cross-section of the three columns of the three-frame three-column three-phase coil is either circular or square, and the three columns are located at the three vertices of an equilateral triangle.

[0011] The magnetic material is wound around the three columns of the three-frame, three-column, three-phase coil to form a structure in which the magnetic material surrounds the high-voltage and low-voltage coils.

[0012] Furthermore, the three columns of the three-frame, three-column three-phase coil have circular cross-sections; the winding jig is an arc-shaped coil winding jig; the A-phase coil, B-phase coil, and C-phase coil are completed on the arc-shaped coil winding jig. The low-voltage coils of the A-phase coil, B-phase coil, and C-phase coil are wound tightly against the arc-shaped coil winding jig. An insulation layer is wrapped around the low-voltage coil, and a high-voltage coil is wound around the insulation layer to form a single-phase coil with a semi-circular cross-section. Insulation layers are wrapped around the A-phase coil, B-phase coil, and C-phase coil respectively and tightened. The left side of the A-phase coil is joined to the right side of the B-phase coil, the left side of the B-phase coil is joined to the right side of the C-phase coil, and the left side of the C-phase coil is joined to the right side of the A-phase coil. Insulating material is used to tighten the joined coils; the cross-section of the joined coils is circular.

[0013] Furthermore, the three columns of the three-frame, three-column three-phase coil have square cross-sections. The winding fixture includes a square-frame coil winding fixture and a trapezoidal coil winding fixture. The A-phase coil and the B-phase coil are wound using the square-frame coil winding fixture. First, the low-voltage coil is wound, and an insulation layer is provided outside the low-voltage coil. Then, the high-voltage coil is wound outside the insulation layer, and finally, it is wound into a long oval frame cross-section structure with right-angled sides symmetrical to form a right-angled triangular prism. The C-phase coil is wound using the trapezoidal coil winding fixture. First, the low-voltage coil is wound, and an insulation layer is provided outside the low-voltage coil. Then, the high-voltage coil is wound outside the insulation layer, and finally, it is wound into a long oval frame cross-section structure with hypotenuse symmetrical to form a right-angled triangular prism. The left side of the A-phase coil is joined to the right side of the B-phase coil, the left side of the B-phase coil is joined to the right side of the C-phase coil, and the left side of the C-phase coil is joined to the right side of the A-phase coil, forming a three-frame, three-column three-phase coil with three columns having square cross-sections.

[0014] Furthermore, the magnetic material is one of curved silicon steel, silicon steel strip, or amorphous alloy strip of equal width, and the magnetic material is wound around the three columns of the three-frame three-column three-phase coil, with its window being circular.

[0015] Furthermore, the A-phase coil, B-phase coil, and C-phase coil are all provided with an insulating layer on their exteriors; an insulating layer is provided between the low-voltage coil and the high-voltage coil of the A-phase coil, B-phase coil, and C-phase coil.

[0016] Furthermore, the contact surface between the magnetic material and the three-frame, three-column, three-phase coil is provided with an insulating layer.

[0017] Furthermore, the A-phase coil, B-phase coil, and C-phase coil are made of copper or aluminum.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] By designing the three-phase high and low voltage coils into a two-frame, three-column elongated oval structure, with the iron core wound around the three columns, and by interchangeably combining the coils and iron core of a traditional transformer, the magnetic field traverses a smaller loop. This improves magnetic permeability, and the gapless design reduces no-load current and eddy current losses, significantly lowering iron losses compared to traditional structures. Simultaneously, it balances the costs of the coils and iron core, optimizing overall cost while ensuring performance. The simple structure facilitates manufacturing and assembly, providing a new solution for the efficient, energy-saving, and low-cost application of high-power transformers. It has broad application value and prospects in power transmission and conversion scenarios, contributing to the upgrading and iteration of power equipment towards a greener and more economical direction. Attached Figure Description

[0020] Figure 1 This is a top view of the A-phase coil winding structure in the first embodiment of this utility model.

[0021] Figure 2 This is a longitudinal cross-sectional view of the A-phase coil in the first embodiment of this utility model.

[0022] Figure 3 This is a top view of the C-phase coil winding structure in the first embodiment of this utility model.

[0023] Figure 4 This is a top view showing the A, B, and C phase coils joined together in pairs in the first embodiment of this utility model.

[0024] Figure 5 This is a schematic diagram of the rotating device of this utility model.

[0025] Figure 6 This is a top view of the structure of a three-phase transformer according to the first embodiment of this utility model.

[0026] Figure 7 This is a schematic diagram of the magnetic material winding method of this utility model.

[0027] Figure 8 This is a top view of the A-phase coil winding structure in the second embodiment of this utility model.

[0028] Figure 9 This is a top view showing the A, B, and C phase coils joined together in pairs in the second embodiment of this utility model.

[0029] Figure 10 This is a top view of the structure of a three-phase transformer according to the second embodiment of this utility model.

[0030] In the diagram: 11. First high-voltage coil; 12. Second high-voltage coil; 13. Third high-voltage coil; 21. First low-voltage coil; 22. Second low-voltage coil; 23. Third low-voltage coil; 3. Three-phase coil; 4. Magnetic material; 5. Rotating device; 6. Arc-shaped coil winding jig; 7. Square-shaped coil winding jig; 8. Trapezoidal coil winding jig. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] This utility model discloses a three-dimensional wound core transformer, which consists of an A-phase coil, a B-phase coil, a C-phase coil, three winding jigs, and three sets of magnetic materials 4. The A-phase coil includes a first low-voltage coil 11 and a first high-voltage coil 21; the B-phase coil includes a second low-voltage coil 12 and a second high-voltage coil 21; and the C-phase coil includes a third low-voltage coil 13 and a third high-voltage coil 23. Example 1

[0033] Please see Figure 1 As shown, the A-phase coil and B-phase coil are wound on a square-shaped coil winding jig 7. To facilitate coil demolding, the square-shaped coil winding jig 7 is an elongated oval jig, divided into upper, middle, and lower parts. The upper and lower parts of the square-shaped coil winding jig 7 are symmetrical semicircles, and the middle part is a square frame structure. The semicircles of the upper and lower parts are tangent to the middle square frame at all contact points. This jig can be used to wind coils with a triangular prism cross-section in the middle and a semicircular cross-section at the top. Figure 1 As shown: The first low-voltage coil 11 of phase A is wound tightly against the square-shaped coil winding jig 7. An insulation layer is wrapped around the first low-voltage coil 11, and then the first high-voltage coil 21 is wound around the insulation layer. After the phase A coil is wound, the middle square of the square-shaped coil winding jig 7 is removed first, followed by the top and bottom semicircles. After demolding, an insulation layer is wrapped around the phase A coil and tightened. The final vertical cross-section of the completed phase A coil is shown below. Figure 2 As shown.

[0034] The B-phase coil is wound using the same winding process as the A-phase coil.

[0035] like Figure 3 As shown, the C-phase coil is wound on a trapezoidal coil winding jig 8. To facilitate coil demolding, the trapezoidal coil winding jig 8 is divided into three parts: upper, middle, and lower. The upper and lower parts of the trapezoidal coil winding jig 8 are symmetrical semicircles, with a trapezoidal structure in the middle. The semicircles at both ends are tangent to the middle trapezoidal section at all contact points. Using this jig, C-phase coils with symmetrical triangular prism cross-sections and a semicircular top cross-section can be wound. Figure 3 As shown, the first low-voltage coil 13 of the C-phase coil is wound tightly against the trapezoidal coil winding jig 8. An insulation layer is wrapped around the first low-voltage coil 13, and then the first high-voltage coil 23 is wound around the insulation layer. After the C-phase coil is wound, the trapezoidal coil winding jig 8 is demolded, and then the C-phase coil is wrapped with an insulation layer and secured.

[0036] like Figure 4As shown, the A-phase coil, B-phase coil, and C-phase coil are then joined together in pairs. The oblique face of the triangular prism of the A-phase coil is joined to the oblique face of the triangular prism of the B-phase coil. The oblique face of the other triangular prism of the B-phase coil is joined to the oblique face of the triangular prism of the C-phase coil. The oblique face of the other triangular prism of the C-phase coil is joined to the oblique face of the other triangular prism of the A-phase coil. Each pair is separated by insulating material, and then the joined coils are tightly wrapped with insulating tape. The cross-section of the joined coils is square, and the three square cross-sections are shown below. Figure 4 The distribution is shown. This forms a three-frame, three-column, semi-circular three-phase coil structure at both ends.

[0037] Please see Figure 6 As shown, the three sets of magnetic materials 4 are respectively wound on the three columns of the three-phase coil 3 with semicircles at both ends of the three-frame three-column structure, forming a structure in which the magnetic materials 4 surround the high and low voltage coils.

[0038] like Figure 5 As shown, the magnetic material 4 is wound around the three columns of the three-phase coil 3, which has a three-frame, three-column configuration with semicircles at both ends, on the rotating device 5. The rotating device 5 is a cylindrical structure composed of three sector-shaped columns with a central angle of 120°. The rotating device 5 includes a stator and a rotor. The stator is fixed on the columns of the three-phase coil 3 with a double-frame, three-column structure. The rotor of the rotating device 5 drives the magnetic material 4 to rotate, winding the magnetic material 4 around the columns of the three-phase coil 3 with a double-frame, three-column, elongated oval structure. After the magnetic material 4 is wound, the three sector-shaped columns of the rotating device 5 can be removed one by one.

[0039] In the above-described device of this embodiment, please refer to... Figure 7 As shown, magnetic material 4 is assembled according to the following steps:

[0040] (1) Install a detachable rotating device 5 on the column of the three-phase coil 3 with semicircles at both ends of the three-frame three-column;

[0041] (2) The stator of the rotating device 5 is fixed on the column of the three-phase coil 3 with semicircles at both ends of the three-frame three-column structure. The rotor of the rotating device 5 drives the magnetic material 4 to rotate, and winds the magnetic material 4 around the column of the three-phase coil 3 with semicircles at both ends of the three-frame three-column structure.

[0042] (3) The magnetic material 4 is wound into a circle on the column of the three-phase coil 3 with semicircles at both ends of the three-frame three-column;

[0043] (4) After the magnetic material 4 is wound, the rotating device 5 is disassembled, thus completing the production of the three-phase energy-saving transformer.

[0044] The window of the magnetic material 4 described above is circular; the magnetic material 4 is made of silicon steel strips or amorphous alloy strips of equal width wound together.

[0045] The high and low voltage coils of the A-phase coil, B-phase coil, and C-phase coil mentioned above are made of copper or aluminum.

[0046] The magnetic material 4 is made of one of the following: curved silicon steel, silicon steel strip, or amorphous alloy strip.

[0047] Each layer of the magnetic material 4 is coated with insulating varnish or other insulating material.

[0048] Furthermore, the manufacturing method of the three-dimensional wound core transformer of this utility model includes the following steps:

[0049] (1) The A-phase coil is completed in the square-shaped coil winding jig 7. First, the low-voltage coil 11 is wound into a closed profile consisting of a middle right-angled trapezoid or triangular prism and two semi-circular ends. The low-voltage coil 11 is wrapped with an insulation layer, and the high-voltage coil 12 is wound on the outside of the insulation layer to complete the closed profile structure of the A-phase coil with a middle right-angled triangular prism section and two semi-circular ends.

[0050] (2) The low-voltage coil of phase B is wound in the same way as the winding method of phase A in step (1); the insulation layer is wrapped around the outside of the low-voltage coil 11, and the high-voltage coil 22 of phase B is wound around the outside of the insulation layer to complete the winding of phase B coil in the same way as phase A coil.

[0051] (3) The C-phase coil is completed on the trapezoidal coil winding jig 8; the first low-voltage coil 13 of the C-phase coil is wound close to the trapezoidal coil winding jig 8, and an insulation layer is wrapped around the outside of the first low-voltage coil 13. The first high-voltage coil 23 is then wound around the outside of the insulation layer to complete the winding of the closed contour structure of the C-phase coil with the middle right-angled triangular prism cross section and the two ends semi-circular cross sections.

[0052] (4) The A-phase coil, B-phase coil and C-phase coil are wrapped with insulation and tightened.

[0053] (5) The A-phase coil, B-phase coil and C-phase coil are then joined together in pairs to form a three-frame, three-column, semi-circular three-phase coil structure;

[0054] (6) Install a detachable rotating device 5 on the column of the three-phase coil with semicircles at both ends of the three-frame three-column in step (5);

[0055] (7) The rotating device 5 drives the magnetic material 4 to rotate, and winds the magnetic material 4 around the column of the three-phase coil with semicircles at both ends of the three-frame three-column.

[0056] (8) After the magnetic material 4 is wound, the rotating device 5 is disassembled, thus completing the production of the three-phase energy-saving transformer.

[0057] Furthermore, in steps (1) to (4), an insulating layer is provided between all the high-voltage coils and the low-voltage coils.

[0058] Furthermore, in step (7), the magnetic material 4 is wound into a circle on the column of the three-phase coil with semicircles at both ends of the three-frame three-column. Example 2

[0059] like Figure 8 As shown, the A-phase coil, B-phase coil, and C-phase coil are completed on the arc-shaped coil winding jig 6. To facilitate coil demolding, the arc-shaped coil winding jig 6 is divided into left and right halves. The upper and lower sides of the arc-shaped coil winding jig 6 are symmetrical arcs, tangent to the middle square part. The arc-shaped coil winding jig 6 can be used to wind coils with a semi-circular cross-section. As shown in Figure 8: the first low-voltage coil 11 of the A-phase coil is wound tightly against the arc-shaped coil winding jig 6. An insulation layer is wrapped around the first low-voltage coil 11, and the first high-voltage coil 21 is wound around the insulation layer. After the A-phase coil is wound, the left and right halves of the arc-shaped coil winding jig 6 are removed respectively, and an insulation layer is wrapped around the A-phase coil and tightened.

[0060] Using the above process, the B-phase coil and C-phase coil are wound separately, and then joined together in pairs, as shown. Figure 9 As shown: The left side of phase A coil is joined to the right side of phase B coil, the left side of phase B coil is joined to the right side of phase C coil, and the left side of phase C coil is joined to the right side of phase A coil. An insulating layer is placed between each pair of coils, and then insulating material is used to secure the joined coils together. The cross-section of the joined coils is circular, and the three circular cross-sections are shown below. Figure 9 The coils are distributed at the positions shown. This forms a three-frame, three-cylinder structure, with the three frames of the three-phase coil being oblong in shape, as shown... Figure 2 As shown. Figure 10 As shown, the magnetic material 4 is wound around the three cylinders of the three-phase coil, and the winding method is the same as in Embodiment 1.

[0061] This invention designs the three-phase high and low voltage coils into a three-frame, three-column, semi-circular structure with the iron core wound around the three columns. This interchanges the coil and iron core of traditional transformers, allowing the magnetic field to circumvent the conventional design. This improves permeability, reduces no-load current through the gapless design, minimizes eddy current losses, and significantly reduces iron losses compared to traditional structures. Simultaneously, it balances the costs of the coils and iron core, optimizing overall cost while ensuring performance. The simple structure facilitates manufacturing and assembly, providing a new solution for the efficient, energy-saving, and low-cost application of high-power transformers. It has broad application value and prospects in power transmission and conversion scenarios, contributing to the upgrading and iteration of power equipment towards a greener and more economical direction.

[0062] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A three-dimensional wound core transformer comprising an A-phase coil, a B-phase coil, a C-phase coil, a winding former, and a magnetic material, characterized by, The A-phase coil includes a first low-voltage coil and a first high-voltage coil. The first low-voltage coil is wound into an elongated oval structure with a cross-section of a rectangular frame in the middle and symmetrical semicircles at both ends. The first high-voltage coil is wound outside the first low-voltage coil. The B-phase coil includes a second low-voltage coil and a second high-voltage coil. The second low-voltage coil is wound with the same cross-sectional structure as the first low-voltage coil, and the second high-voltage coil is wound outside the second low-voltage coil. The C-phase coil includes a third low-voltage coil and a third high-voltage coil. The third low-voltage coil is wound into an elongated oval structure with a central rectangular frame and symmetrical semicircles at both ends. The third high-voltage coil is wound outside the third low-voltage coil. The left side of the A-phase coil is joined to the right side of the B-phase coil, the left side of the B-phase coil is joined to the right side of the C-phase coil, and the left side of the C-phase coil is joined to the right side of the A-phase coil, forming a three-frame, three-column, three-phase coil consisting of three frames and three columns. The three frames of the three-frame, three-column, three-phase coil are all oblong in cross-section, with the middle part tangent to the semicircles at both ends. The cross-section of the three columns of the three-frame three-column three-phase coil is either circular or square, and the three columns are located at the three vertices of an equilateral triangle. The magnetic material is wound around the three columns of the three-frame, three-column, three-phase coil to form a structure in which the magnetic material surrounds the high-voltage and low-voltage coils.

2. A three-dimensional wound core transformer according to claim 1, characterized in that, The three columns of the three-frame, three-column three-phase coil have circular cross-sections; the winding jig is an arc-shaped coil winding jig; the A-phase coil, B-phase coil, and C-phase coil are completed on the arc-shaped coil winding jig. The low-voltage coils of the A-phase coil, B-phase coil, and C-phase coil are wound tightly against the arc-shaped coil winding jig. An insulation layer is wrapped around the low-voltage coil, and a high-voltage coil is wound around the insulation layer to form a single-phase coil with a semi-circular cross-section. Insulation layers are wrapped around the A-phase coil, B-phase coil, and C-phase coil respectively and tightened. The left side of the A-phase coil is joined to the right side of the B-phase coil, the left side of the B-phase coil is joined to the right side of the C-phase coil, and the left side of the C-phase coil is joined to the right side of the A-phase coil. The joined coils are tightened with insulating material; the cross-section of the joined coils is circular.

3. A three-dimensional wound core transformer according to claim 1, characterized in that, The three columns of the three-frame, three-column three-phase coil have square cross-sections. The winding fixture includes a square-frame coil winding fixture and a trapezoidal coil winding fixture. The A-phase coil and the B-phase coil are wound using the square-frame coil winding fixture. First, the low-voltage coil is wound, and an insulation layer is provided outside the low-voltage coil. Then, the high-voltage coil is wound outside the insulation layer, and finally, it is wound into a long oval frame cross-section structure with right-angled sides symmetrical to form a right-angled triangular prism. The C-phase coil is wound using the trapezoidal coil winding fixture. First, the low-voltage coil is wound, and an insulation layer is provided outside the low-voltage coil. Then, the high-voltage coil is wound outside the insulation layer, and finally, it is wound into a long oval frame cross-section structure with hypotenuse symmetrical to form a right-angled triangular prism. The left side of the A-phase coil is joined to the right side of the B-phase coil, the left side of the B-phase coil is joined to the right side of the C-phase coil, and the left side of the C-phase coil is joined to the right side of the A-phase coil, forming a three-frame, three-column three-phase coil with three columns having square cross-sections.

4. A three-dimensional wound core transformer according to claim 1, characterized in that, The magnetic material is one of curved silicon steel, silicon steel strip, or amorphous alloy strip of equal width. The magnetic material is wound around the three columns of the three-frame, three-column, three-phase coil, and its window is circular.

5. A three-dimensional wound core transformer according to claim 1, characterized in that, The A-phase coil, B-phase coil, and C-phase coil are all provided with an insulating layer on their exteriors; an insulating layer is provided between the low-voltage coil and the high-voltage coil of the A-phase coil, B-phase coil, and C-phase coil.

6. A three-dimensional wound core transformer according to claim 1, characterized in that, The contact surface between the magnetic material and the three-frame, three-column, three-phase coil is provided with an insulating layer.

7. A three-dimensional wound core transformer according to claim 1, characterized in that, The A-phase coil, B-phase coil, and C-phase coil are made of copper or aluminum.

Images