Power main transformer structure

Abstract

The invention provides a power main transformer structure. The power main transformer structure comprises a magnetic core, a first framework, a second framework, a primary winding and a secondary winding. The magnetic core comprises a magnetic column, the first framework and the second framework are arranged on the magnetic column in a sleeving mode, and the first framework is arranged on the outer side of the second framework in a sleeving mode. One of the primary winding and the secondary winding is wound on the first framework, and the other one is wound on the second framework. A gap is formed between the first skeleton and the second skeleton. According to the invention, the first skeleton and the second skeleton sleeve the magnetic column and are arranged in an overlapped manner, so that it can be ensured that the transmission energy of unit turns is higher than that of non-overlapped arrangement, and meanwhile, the magnetic flux leakage is small, the precision is high, and the structure is suitable for various power levels. The first framework and the second framework are spaced, so that stray capacitance between the primary winding and the secondary winding is smaller, meanwhile, the gap is used for heat dissipation and ventilation, and the loss problem and the power density problem caused by heat dissipation can be effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer equipment, and in particular relates to a power main transformer structure. Background Art

[0002] The structure of a power main transformer generally consists of a primary winding, a secondary winding and a magnetic core. It is essentially a transformer. During the design process, many issues need to be considered, such as insulation, heat dissipation and parasitic capacitance.

[0003] Most of the existing power transformer structures use insulating medium to stack the primary winding and secondary winding to minimize the leakage flux phenomenon and increase the transmission energy, but it is difficult to dissipate heat, the winding loss is high, and the parasitic capacitance is large. If the primary winding and the secondary winding are not arranged in close contact, the parasitic capacitance and winding loss can be reduced, and the heat dissipation can also be reduced, but it will lead to poor coupling coefficient, large secondary leakage copper, and low transmission energy per unit number of turns, thus limiting the power increase. Summary of the invention

[0004] The technical purpose of the present invention is to provide a power main transformer structure, aiming to improve the heat dissipation capacity of the power main transformer structure without amplifying other negative effects.

[0005] To solve the above technical problems, the present invention is implemented as follows: a power main transformer structure, comprising: a magnetic core, a first frame, a second frame, a primary winding and a secondary winding;

[0006] The magnetic core comprises a magnetic column, a first frame and a second frame are sleeved on the magnetic column, and the first frame is sleeved on the outer side of the second frame;

[0007] One of the primary winding and the secondary winding is wound on the first frame, and the other is wound on the second frame;

[0008] The first frame and the second frame have a gap.

[0009] In one of the embodiments, two ends of the magnetic column are provided with limiting ends, and the first frame and the second frame are both limitedly matched with the limiting ends.

[0010] In one embodiment, a plurality of first limiting members are provided at both ends of the first frame, and the plurality of first limiting members surround a first accommodation space, and along the first direction, the limiting end is located in the accommodation space and fits the first limiting member;

[0011] A plurality of second limiting members are provided at both ends of the second frame, and the plurality of second limiting members enclose a second accommodating space. Along the first direction, the limiting end is located in the accommodating space and fits the second limiting member; wherein the first direction is perpendicular to the length extension direction of the magnetic column.

[0012] In one embodiment, the magnetic column is provided with at least one groove, which extends along the length direction of the magnetic column and penetrates the magnetic column, and the second frame is attached to the outer peripheral surface of the magnetic column to form a heat dissipation duct with the side wall of the groove.

[0013] In one of the embodiments, the second frame includes a fitting surface and a heat dissipation surface, the fitting surface and the heat dissipation surface are connected end to end, the heat dissipation surface and the side wall of the groove are surrounded to form a heat dissipation duct, and the heat dissipation surface is hollowed out.

[0014] In one embodiment, the magnetic column is provided with limiting ends at both ends, the outer peripheral surface of the limiting end includes a limiting surface, the limiting surface and the side wall of the groove are arranged coplanarly, the first limiting member extends along the outer peripheral surface of the end surface of the first skeleton, and the two ends of the first limiting member are bent to form a first limiting piece, and the bending angle of the first limiting piece is the same as the angle of the limiting surface;

[0015] The second limiting member extends along the outer circumference of the end surface of the second frame, and both ends of the second limiting member are bent to form a second limiting piece, and the bending angle of the second limiting piece is the same as the angle of the limiting surface.

[0016] In one embodiment, the magnetic core also includes a side column, one end of which is fixedly connected to the limiting end, the extension direction of the side column is the same as the length direction of the magnetic column, and the side column is arranged at intervals with the side column in the radial direction of the magnetic column, and the first skeleton and the second skeleton are located in the accommodating cavity.

[0017] In one embodiment, a connecting piece is provided at one end of the second frame, the connecting piece is fixedly connected to the second frame and extends toward the first frame, and the connecting piece is detachably connected to the first frame.

[0018] In one of the embodiments, the first skeleton is hollowed out.

[0019] In one embodiment, the inner wall of the first frame is provided with reinforcing ribs protruding inwards and extending along the length direction of the first frame, with a minimum distance between them. In the radial direction of the first frame, the length of the reinforcing ribs is greater than the minimum distance.

[0020] Compared with the prior art, the power main transformer structure of the present invention has the following beneficial effects: the first frame and the second frame are sleeved on the magnetic column and overlapped, which can ensure that the energy transmitted per unit number of turns is higher than that of non-overlapping arrangement, and at the same time, the leakage flux is small, the precision is high, and it is suitable for various power levels. The first frame and the second frame are spaced apart, so that the parasitic capacitance between the primary winding and the secondary winding is smaller, and the space is used for heat dissipation and ventilation, which can effectively reduce the loss problem and power density problem caused by heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the overall structural diagram of the power main transformer structure;

[0022] Figure 2 is a schematic diagram of the structure of the first skeleton and the second skeleton;

[0023] Figure 3 It is a top view of the power main transformer structure;

[0024] Figure 4 It is a schematic diagram of the structure of the magnetic core.

[0025] In the accompanying drawings, the various reference numerals represent: a magnetic core 100; a magnetic column 110; a curved segment 111; a straight segment 112; a limiting end 120; a limiting surface 121; a heat dissipation duct 130; a side column 140; a first frame 200; a first limiting member 210; a first limiting plate 211; a reinforcing edge 220; a second frame 300; a second limiting member 310; a second limiting plate 311; a connecting member 320; a primary winding 400; and a secondary winding 500. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but are not to be construed as limiting the present invention. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0027] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “circumferential”, “radial”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] See also Figure 1 and Figure 2 , Figure 1The schematic diagram of the power main transformer structure is shown. Figure 2 The schematic diagram of the structure of the first skeleton 200 and the second skeleton 300 is shown. In one embodiment, the present application provides a power main transformer structure, which mainly includes a magnetic core 100, a first skeleton 200, a second skeleton 300, a primary winding 400, and a secondary winding 500. The magnetic core 100 includes a magnetic column 110, and the first skeleton 200 and the second skeleton 300 are sleeved on the magnetic column 110, and the first skeleton 200 is sleeved on the outside of the second skeleton 300. One of the primary winding 400 and the secondary winding 500 is wound on the first skeleton 200, and the other is wound on the second skeleton 300. The first skeleton 200 and the second skeleton 300 are spaced apart.

[0030] The power main transformer structure of the present invention has the following beneficial effects compared with the prior art: the first skeleton 200 and the second skeleton 300 are set on the magnetic column 110, and the overlapping arrangement can ensure that the energy transmitted per unit number of turns is higher than that of the non-overlapping arrangement. At the same time, the leakage flux is small, the precision is high, and it is suitable for various power levels. The first skeleton 200 and the second skeleton 300 have a gap, so that the parasitic capacitance between the primary winding 400 and the secondary winding 500 is smaller, the impedance of the primary and secondary common mode paths is larger, the EMI performance is better, and the gap can form a magnetic flux leakage channel, forming a parasitic inductance, effectively reducing the demand for external resonant inductance. At the same time, the gap is used for heat dissipation and ventilation, which can effectively reduce the loss problem and power density problem caused by heat dissipation.

[0031] In the power main transformer structure provided in the present application, the spacing distance between the first frame 200 and the second frame 300 is determined by the parasitic capacitance requirement, the leakage inductance requirement, and the withstand voltage capability. Based on the capacitance requirement, it can be determined by the following formula:

[0032]

[0033] Among them, d 空1 is the distance between the primary winding 400 and the secondary winding 500, ε 空 is the dielectric constant of air, ε 介 is the dielectric constant of the insulating medium, Sps is the overlapping distance between the primary winding 400 and the secondary winding 500, and Cps is the parasitic equivalent capacitance between the primary winding 400 and the secondary winding 500.

[0034] Based on the leakage inductance requirement, the spacing distance formula is as follows:

[0035]

[0036] Among them, d 空2 L is the air distance between the primary winding 400 and the secondary winding 500. kis the parasitic leakage inductance, h is the transformer window height, μ0 is the air magnetic permeability, and N is the number of transformer turns.

[0037] From the perspective of insulation withstand voltage, the separation distance formula is as follows:

[0038] d 空3

[0039] Among them, d 空3 is the air distance between the primary winding 400 and the secondary winding 500, U is the voltage across the air gap, and E is the maximum field strength allowed by the air.

[0040] In this solution, the size design of the second frame 300 is controlled by the size of the magnetic column 110. The difference between the equivalent inner diameter size d1 of the first frame 200 and the outer diameter d2 of the small frame is equal to the air distance between the designed primary winding 400 and the secondary winding 500, plus the thickness D of the winding wound on the second frame 300. The formula is as follows:

[0041] d2=d1+D+d 空

[0042] where d 空 The value of 空1 , d 空2 , d 空3 , one of them is actually defined according to the requirements.

[0043] By associating the structure of the magnetic core 100, the skeleton structure, and the actual design parameters, the three together determine the structure of the magnetic core 100 and the skeleton structure. The magnetic core 100 is used to fix the first skeleton 200 and the second skeleton 300. The first skeleton 200 and the first skeleton 200 together provide a heat dissipation air cavity for the magnetic core 100 and the winding, and are coupled to each other, solving the fixing and heat dissipation functions at the same time, and realizing the flexible adjustment of the parasitic parameters and heat dissipation capacity of the entire magnetic device according to the actual design requirements.

[0044] The magnetic core 100, the primary winding 400 and the secondary winding 500 in this solution can be wound on different frames respectively. Since they are directly detachably connected to each other, they can be operated separately. At the manufacturing level, it is helpful for assembly line processing and improves processing speed. At the same time, it can also improve the insulation problem caused by the overlapping winding of the primary winding 400 and the secondary winding 500, which is helpful for the reliability of magnetic devices, so that automated equipment can be used to process the winding. At the same time, the primary winding 400 and the secondary winding 500 are wound separately, and the distance between the primary winding 400 and the secondary winding 500 can be selected according to the parasitic capacitance, parasitic inductance, and insulation withstand voltage required by the actual design. The parasitic inductance and parasitic capacitance can be customized to meet the high withstand voltage requirements while meeting the heat dissipation problems of the primary winding 400 and the secondary winding 500. This solution can enable magnetic devices to achieve higher power density, higher reliability, more efficient processing rate, higher withstand voltage requirements, better EMI performance, and integrate some resonant inductance functions as needed.

[0045] In the present application, the first skeleton 200 and the second skeleton 300 are cylindrical, and the diameter of the first skeleton 200 is larger than that of the second skeleton 300, so the first skeleton 200 can be sleeved on the outside of the second skeleton 300. At the same time, either the first skeleton 200 or the second skeleton 300 can be used as the primary skeleton, and the other is the secondary skeleton. In the accompanying drawings, the primary winding 400 is wound on the first skeleton, and the secondary winding 400 is wound on the second skeleton 300. The number of turns of the primary winding 400 and the secondary winding 500 is determined according to specific needs. The stability of the interval between the first skeleton 200 and the second skeleton 300 only requires the first skeleton 200 and the second skeleton 300 to be fixedly connected, which can be directly connected or indirectly connected. The present application adopts an indirect connection method.

[0046] For details, see Figure 1 In one of the embodiments, the present application fixes the first skeleton 200 and the second skeleton 300 by means of the magnetic core 100, so as to ensure the stability of the interval between the two. In one of the embodiments, the magnetic column 110 is provided with a limit end 120 at both ends, and the first skeleton 200 and the second skeleton 300 are both limitedly matched with the limit end 120. Specifically, the first skeleton 200 is provided with a plurality of first limit members 210 at both ends, and the plurality of first limit members 210 enclose a first accommodation space, and along the first direction, the limit end 120 is located in the accommodation space and fits the first limit member 210. The second skeleton 300 is provided with a plurality of second limit members 310 at both ends, and the plurality of second limit members 310 enclose a second accommodation space, and along the first direction, the limit end 120 is located in the accommodation space and fits the second limit member 310; wherein, the first direction is perpendicular to the length extension direction of the magnetic column 110.

[0047] from Figure 1It can be seen that the first limiting member 210 of the first frame 200 and the second limiting member 310 of the second frame 300 sandwich the limiting end 120 of the magnetic core 100, and the first frame 200 and the second frame 300 are both restricted in spatial movement and rotation by the limiting end 120, so that the two are relatively fixedly connected, thereby ensuring the stability of the interval.

[0048] The assembly order of the magnetic device in the present application is as follows: the primary winding 400 and the secondary winding 500 are respectively wound on the corresponding first frame 200 and the second frame 300, and the primary winding 400 and the secondary winding 500 can be operated separately. Then, the second frame 300 winding is first assembled to the magnetic column 110, and then the first frame 200 is assembled to the magnetic column 110, and fixed to the magnetic column 110 by the first limit member 210 and the second limit member 310, ensuring that the relative position of the first frame 200 and the second frame 300 is the designed position.

[0049] In some other embodiments, the first frame 200 and the second frame 300 may also be directly fixedly connected, see Figure 2 A connecting piece 320 is provided at one end of the second skeleton 300, and the connecting piece 320 is fixedly connected to the second skeleton 300 and extends toward the first skeleton 200. The connecting piece 320 is detachably connected to the first skeleton 200. When the second skeleton 300 does not have a second limiting piece 310, connecting pieces 320 can be respectively provided at both ends of the second skeleton 300 to fix the second skeleton 300 and the first skeleton 200, and a fixed connection with the magnetic core 100 is achieved through the first connecting piece 320 of the first skeleton 200.

[0050] See also Figure 3 and Figure 4 , Figure 3 The top view of the power transformer structure is shown. Figure 4 The structural diagram of the magnetic column 110 is shown. In one embodiment, the magnetic column 100 is provided with at least one groove. In this embodiment, two grooves are provided and the two grooves are symmetrical along the half-section of the magnetic column 110. Specifically, the outer peripheral surface of the magnetic column 110 includes a curved segment 111 and a straight segment 112. The second skeleton 300 fits the curved segment 111. The straight segment 112 is inclined toward the center of the magnetic column 110. A groove is formed on the side of the magnetic column 110 where the two straight segments 112 are located. The first skeleton 200 and the groove are arranged to form a heat dissipation duct 130 to improve the heat dissipation capacity of the entire power transformer structure. In this embodiment, the magnetic column 110 in this application is a cylinder, and two fan-shaped notches are formed on two symmetrical sides. The straight segment 112 is the two radii of the fan-shaped notch. However, the radius here is not the radius of the magnetic column 110 itself, because the top angle of the fan-shaped notch cannot be the axis of the magnetic column 110.

[0051] In other embodiments, the magnetic column 110 can be in other shapes, such as a rectangle or other polygonal prism, and the groove does not have to be fan-shaped. Without affecting the relative position of the first frame 200 and the magnetic column 110 and the magnetic size of the magnetic column 110 itself, it is sufficient to form a cavity between the first frame 200 and the magnetic column 110 with both sides connected to the external environment to facilitate heat dissipation.

[0052] Preferably, see Figure 2 , combined with Figure 4 In one embodiment, due to the presence of the groove, the side of the second frame 300 is naturally divided into a fitting surface and a heat dissipation surface, wherein the fitting surface fits with the magnetic column 110, and the heat dissipation surface and the side wall of the groove are surrounded by a heat dissipation duct 130. In this embodiment, the hollowing out of the heat dissipation surface can facilitate faster heat dissipation of the primary winding 400 or the secondary winding 500 wound on the first frame 200. Similarly, since there is a gap between the first frame 200 and the second frame 300, the second frame 300 can also be hollowed out, and unlike the first frame 200, which only has a hollowing out of the heat dissipation surface, the second frame 300 can be completely hollowed out because there is a gap with the first frame 200 within the range of 360° on the outer circumference, so that the heat transfer is smoother and the heat dissipation effect is better.

[0053] See also Figure 1 and Figure 4 In one embodiment, the outer circumference of the limiting end 120 includes a limiting surface 121, the straight line segment 112 of the outer circumference of the magnetic column 110 is coplanar with the limiting surface 121, and the first limiting member 210 and the second limiting member 310 are both in contact with the limiting surface 121. The coplanar arrangement will not block the two ends of the heat dissipation duct 130, which is conducive to heat dissipation. At the same time, since the outer circumference of the limiting end 120 passes through a plane, the first limiting member 210 of the first frame 200 and the second limiting member 310 of the second frame 300 are more easily in contact with the limiting surface 121.

[0054] In the above embodiment, the cross-section of the groove is a fan-shaped shape, so that the side of the limit end 120 is similar to an "X" shape. When the cross-section of the groove is another shape, the limit surface 121 of the limit end 120 can be adjusted accordingly, so that the heat dissipation duct can pass through the magnetic column 110 and the limit end 120. This is not only conducive to heat dissipation, but also can ensure that the diameter of the first skeleton 200 and the second skeleton 300 is greater than the minimum distance between the sides of the limit end 120, so that the first limit member 210 and the second limit member 310 can be stuck on both sides of the limit end 120, thereby stabilizing the relative position of the first skeleton 200 and the second skeleton 300.

[0055] Preferably, in one embodiment, the first stopper 210 and the second stopper 310 have the same structure, see Figure 2The first limiting member 210 extends along the outer circumference of the end face of the first frame 200, and the two ends of the first limiting member 210 are bent to form a first limiting piece 211, and the bending angle of the first limiting piece 211 is the same as the angle of the limiting surface 121. The second limiting member 310 extends along the outer circumference of the end face of the second frame 300, and the two ends of the second limiting member 310 are bent to form a second limiting piece 311, and the bending angle of the second limiting piece 311 is the same as the angle of the limiting surface 121. When the limiting surface 121 is a straight line, the first limiting piece 211 and the second limiting piece 311 are also straight lines. When the limiting surface 121 is a curve, the first limiting member 210 and the second limiting member 310 are also set in a curve to better fix the positions of the first frame 200 and the second frame 300.

[0056] from Figure 2 It can be seen that since the diameter of the first frame 200 is larger than that of the second frame 300, the first limiting piece 211 is biased toward the outside of the limiting surface 121 compared to the second limiting piece 311, and the circumferential length of the first limiting member 210 is longer than the circumferential length of the second limiting member 310.

[0057] See also Figure 4 In one embodiment, the magnetic core 100 further includes a side column 140. Specifically, the limiting end 120 has four side surfaces, two opposite side surfaces are limiting surfaces 121, and the ends where the other two surfaces are located are used to fix and connect the side column 140. The side column 140 and the magnetic column 110 are arranged at intervals, and the limiting end 120 and the magnetic column 110 enclose a receiving cavity, and the first frame 200 and the second frame 300 are located in the receiving cavity. The side column 140 mainly plays the role of protecting the second frame 300 and the winding wound on the second frame 300.

[0058] Preferably, in other embodiments, side pillars 140 can be arranged around the limiting end 120 to achieve better protection. In this case, a plurality of through holes are arranged on the limiting end 120 to connect the heat dissipation duct 130, and the side walls of the through holes are used to fix the first frame 200 and the second frame 300. However, compared with the above embodiment in which only the side pillars 140 are arranged at the two ends, the heat dissipation capacity will be slightly insufficient.

[0059] See also Figure 2In one embodiment, the inner wall of the first frame 200 is provided with a reinforcing rib 220 protruding inward and extending along the length direction of the first frame 200. The reinforcing rib 220 can firstly increase the structural strength of the first frame 200. Secondly, the reinforcing rib 220 can be used to determine the minimum distance of the interval. The minimum distance varies according to the specific requirements of the power main transformer structure and the different material parameters. Generally refers to the air breakdown thickness corresponding to the minimum common mode voltage between the primary winding 400 and the secondary winding 500. Preferably, a plurality of reinforcing ribs 220 are provided and are evenly distributed on the inner wall of the first frame 200 in the circumferential direction. For example, six reinforcing ribs 220 are provided, and the interval angle between two adjacent reinforcing ribs 220 is 60°.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A power main transformer structure, characterized in that: include: A magnetic core (100), a first frame (200), a second frame (300), a primary winding (400) and a secondary winding (500); The magnetic core (100) comprises a magnetic column (110), the first frame (200) and the second frame (300) are sleeved on the magnetic column (110), and the first frame (200) is sleeved on the outer side of the second frame (300); One of the primary winding (400) and the secondary winding (500) is wound around the first frame (200), and the other is wound around the second frame (300); The first frame (200) and the second frame (300) have a gap therebetween.

2. The power main transformer structure according to claim 1, characterized in that: The two ends of the magnetic column (110) are provided with limiting ends (120), and the first frame (200) and the second frame (300) are both in limiting cooperation with the limiting ends (120).

3. The power main transformer structure according to claim 2, characterized in that: A plurality of first limiting members (210) are provided at both ends of the first frame (200), and the plurality of first limiting members (210) surround a first accommodation space, and along a first direction, the limiting end (120) is located in the accommodation space and is in contact with the first limiting member (210); A plurality of second limiting members (310) are provided at both ends of the second frame (300), and the plurality of second limiting members (310) enclose a second accommodating space. Along a first direction, the limiting end (120) is located in the accommodating space and fits the second limiting member (310); wherein the first direction is perpendicular to the length extension direction of the magnetic column (110).

4. The power main transformer structure according to claim 3 is characterized in that: The magnetic column (110) is provided with at least one groove, which extends along the length direction of the magnetic column (110) and penetrates the magnetic column (110), and the second frame (300) is attached to the outer peripheral surface of the magnetic column (110) to form a heat dissipation duct (130) with the side wall of the groove.

5. The power main transformer structure according to claim 4, characterized in that: The second frame (300) comprises a fitting surface and a heat dissipation surface, the fitting surface and the heat dissipation surface are connected end to end, the heat dissipation surface and the side wall of the groove are arranged to form a heat dissipation duct (130), and the heat dissipation surface is hollowed out.

6. The power main transformer structure according to claim 4, characterized in that: The outer peripheral surface of the limiting end (120) comprises a limiting surface (121), and the limiting surface (121) and the side wall of the groove are arranged coplanarly, the first limiting member (210) extends along the outer peripheral surface of the end surface of the first frame (200), and the two ends of the first limiting member (210) are bent to form a first limiting piece (211), and the bending angle of the first limiting piece (211) is the same as the angle of the limiting surface (121); The second limiting member (310) extends along the outer circumference of the end face of the second frame (300), and the two ends of the second limiting member (310) are bent to form a second limiting piece (311), and the bending angle of the second limiting piece (311) is the same as the angle of the limiting surface (121).

7. The power main transformer structure according to any one of claims 1 to 6, characterized in that: The magnetic core (100) further comprises a side column (140), one end of which is fixedly connected to the limiting end (120), the extension direction of the side column (140) is the same as the length direction of the magnetic column (110), and the side column (140) is arranged at intervals with the side column (140) in the radial direction of the magnetic column (110), and the first skeleton (200) and the second skeleton (300) are located in the accommodating cavity.

8. The power main transformer structure according to any one of claims 1 to 6, characterized in that: A connecting piece (320) is provided at one end of the second frame (300); the connecting piece (320) is fixedly connected to the second frame (300) and extends toward the first frame (200); the connecting piece (320) is detachably connected to the first frame (200).

9. The power main transformer structure according to any one of claims 1 to 6, characterized in that: The first framework (200) is hollowed out.

10. The power main transformer structure according to any one of claims 1 to 6, characterized in that: The inner wall of the first frame (200) is provided with a reinforcing rib (220) protruding inward and extending along the length direction of the first frame (200), the interval has a minimum distance, and along the radial direction of the first frame (200), the length of the reinforcing rib (220) is greater than the minimum distance.

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