Magnetic device capable of preventing magnetic core from cracking

Abstract

The utility model discloses a magnetic device capable of preventing a magnetic core from cracking. The magnetic device has the advantage of preventing the magnetic core from cracking. The magnetic device comprises two magnetic cores which are oppositely connected, a framework, a coil and an elastic material layer, each magnetic core comprises a middle column and a side column arranged on the side of the middle column, the two magnetic cores are connected through butt joint of the side columns, an air gap is formed between the two middle columns, the framework is sleeved on the middle columns, the coil is wound on the framework, and the elastic material layer is arranged on the framework. And the elastic material layer is fixedly arranged between the two side columns.

Description

Technical Field

[0001] This utility model relates to the field of magnetic devices, and in particular to magnetic devices for preventing core cracking. Background Technology

[0002] For magnetic devices such as transformers and inductors, certain requirements are placed on overall mechanical strength, insulation strength, and moisture resistance. The industry utilizes an impregnation process, involving soaking and vacuuming to coat the product with insulating varnish, followed by heat curing to improve mechanical strength, insulation, and moisture resistance. In magnetic devices, the magnetic core is an indispensable component, playing a crucial role in power conversion, signal transmission, and electromagnetic compatibility.

[0003] A schematic diagram of the magnetic core in a conventional transformer magnetic device is shown below. Figure 4 As shown, the device includes two opposing magnetic cores 01, with a central post 011 on the core body and an air gap 012 between the two central posts. The side posts 013 of the magnetic core are bonded and fixed with adhesive. During the impregnation process of the aforementioned magnetic device, the insulating varnish adheres to the magnetic core, frame, and coil. When the impregnated product undergoes thermal expansion and contraction due to the influence of ambient temperature, the significant difference in the thermal expansion coefficient between the insulating varnish and the magnetic core, frame, and coil generates strong stress. Since the magnetic core is a rigid material, there is no space for stress release, and the stress will concentrate on the core body. When this stress exceeds the range that the magnetic core can withstand, it will cause the magnetic core to crack.

[0004] Therefore, there is an urgent need for a magnetic device that can prevent the core from cracking in order to overcome the above-mentioned defects. Utility Model Content

[0005] The purpose of this invention is to provide a magnetic device that can prevent the magnetic core from cracking.

[0006] To achieve the above objectives, the magnetic device for preventing core cracking of this invention undergoes impregnation treatment after assembly. The magnetic device for preventing core cracking of this invention includes two opposing magnetic cores, a frame, a coil, and an elastic material layer. Each magnetic core includes a central post and side posts located on one side of the central post. The two magnetic cores are connected by the mating of the side posts, and an air gap is formed between the two central posts. The frame is fitted onto the central post, the coil is wound around the frame, and the elastic material layer is disposed between the two side posts and fixedly installed.

[0007] Preferably, the elastic material layer is disposed between the two side columns and fixed with adhesive.

[0008] Preferably, the frame is a vertical or horizontal structure.

[0009] Preferably, the insulating varnish used in the impregnation treatment is a self-drying insulating varnish or a baking insulating varnish.

[0010] Preferably, the cross-sections of the central column and the side columns are rectangular or circular.

[0011] Preferably, the elastic material layer is a circular or square sheet, and the size of the elastic material layer is less than or equal to the size of the cross-section of the side column.

[0012] Preferably, the elastic material layer is made of any one of elastic polyurethane, rubber, synthetic fiber, or elastic alloy material, and the thickness of the elastic material layer is greater than 0.1 mm.

[0013] Preferably, insulating tape is wound between coil layers and on the outside of the coil, and there is at least one coil.

[0014] Preferably, the frame is a square tube structure, and the frame and the magnetic core are fixed together with adhesive.

[0015] Preferably, the central column is fitted inside the frame, and the two ends of the frame are provided with retaining edges.

[0016] Compared with the prior art, the magnetic device of this invention undergoes impregnation treatment after assembly. During the process of temperature changes, the stress generated by the expansion or contraction of the insulating varnish, frame, and coil is transmitted to the magnetic core. This invention reduces the pressure per unit area of ​​the magnetic core by setting an elastic material layer between the two side posts, which can offset or greatly reduce the thermal expansion stress, making the magnetic core more uniformly stressed. When the magnetic device undergoes thermal shock tests, it can greatly reduce the accident of transformer damage caused by cracks in the magnetic core, improve the product quality of the magnetic device, and reduce the defect rate. Attached Figure Description

[0017] Figure 1 This is an exploded perspective view of the magnetic device of this utility model.

[0018] Figure 2 This is a three-dimensional view of the magnetic device of this utility model after the skeleton and coil are hidden.

[0019] Figure 3 yes Figure 2 The magnetic device shown is in a three-dimensional view from another angle.

[0020] Figure 4 This is a three-dimensional diagram of two magnetic cores connected in the prior art. Detailed Implementation

[0021] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0022] like Figure 1 , Figure 2 , Figure 3As shown, this utility model discloses a magnetic device 100 to prevent core cracking. After assembly, it undergoes an impregnation process using insulating varnish. The impregnation is achieved by soaking, vacuuming, and pressurizing to coat the product with the liquid, followed by liquid solidification. This process ultimately enables the magnetic device 100 to achieve moisture resistance, noise reduction, and a fixed frame. The magnetic device 100 includes two opposing magnetic cores 10, a frame 20, a coil 30, and an elastic material layer 40. Each magnetic core 10 includes a central post 11 and a side post 12 located on one side of the central post 11. The two magnetic cores 10 are connected by the mating of the side posts 12, forming an air gap 13 between the two central posts 11. The frame 20 is fitted onto the central post 11, and the coil 30 is wound around the frame 20. The elastic material layer 40 is located between the two side posts 12 and is fixedly installed. After assembly, the magnetic device 100 undergoes impregnation treatment. During temperature changes, the stress generated by the expansion or contraction of the insulating varnish, frame 20, and coil 30 is transmitted to the magnetic core 10. This invention reduces the pressure per unit area of ​​the magnetic core 10 by setting an elastic material layer 40 between the two side posts 12, which can offset or greatly reduce thermal expansion stress, making the magnetic core 10 more uniformly stressed. When the magnetic device 100 undergoes thermal shock tests, it can greatly reduce the accident of transformer damage caused by cracks in the magnetic core 10, improve the product quality of the magnetic device 100, and reduce the defect rate.

[0023] Preferably, the elastic material layer 40 is disposed between the two side posts 12 and fixed with adhesive. The shape of the elastic material layer 40 corresponds to the cross-sectional shape of the side post 12. The elastic material layer 40 is a square or circular sheet, and its size is less than or equal to the cross-sectional size of the side post 12. The elastic material layer 40 is made of any one of the following materials: elastic polyurethane, rubber, synthetic fiber, or elastic alloy material. It is worth noting that all of the above materials have a certain degree of elasticity to offset or reduce thermal expansion stress. To ensure that the elastic material layer 40 can effectively eliminate or reduce thermal expansion stress, the thickness of the elastic material layer 40 is greater than 0.1 mm, such as 0.2 mm or 0.5 mm.

[0024] like Figure 1 As shown, in the embodiment provided by this utility model, the skeleton 20 is a vertical structure. Of course, depending on actual needs, the skeleton 20 can also be used as a horizontal structure. Further, the skeleton 20 is a square tube structure, with two central columns 11 horizontally inserted into the skeleton 20, and the central columns 11 are fitted inside the skeleton 20. The two ends of the skeleton 20 are provided with retaining edges 21. The skeleton 20 and the magnetic core 10 are fixed with adhesive.

[0025] The insulating varnish used in the impregnation treatment is a baking-type insulating varnish, but depending on the actual production and processing needs, a self-drying type insulating varnish can also be used.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown in the embodiment provided by this utility model, the cross-sections of the central column 11 and the side column 12 are rectangular. Preferably, the width of the central column 11 is greater than the width of the side column 12, but this is not a limitation. Depending on the actual application needs, the cross-sections of the central column 11 and the side column 12 can be circular.

[0027] like Figure 1 As shown, insulating tape (not shown in the figure) is wrapped between the layers of coil 30 and on the outside of coil 30. The number of coils 30 can be one or more.

[0028] In this invention, the material of the magnetic core 10 is Mn-Zn ferrite or Ni-Zn ferrite, and the shape of the magnetic core 10 is roughly "E" shaped. However, the above is only an example and does not constitute a limitation on this invention.

[0029] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.

Claims

1. A magnetic device for preventing core cracking, comprising an impregnation treatment after assembly, characterized in that, The device includes two opposing magnetic cores, a frame, a coil, and an elastic material layer. Each magnetic core includes a central post and a side post located on one side of the central post. The two magnetic cores are connected by the mating of the side posts. An air gap is formed between the two central posts. The frame is fitted onto the central post. The coil is wound around the frame. The elastic material layer is located between the two side posts and is fixedly installed.

2. The magnetic device for preventing core cracking according to claim 1, characterized in that, The elastic material layer is disposed between the two side posts and fixed with adhesive.

3. The magnetic device for preventing core cracking according to claim 1, characterized in that, The frame can be a vertical or horizontal structure.

4. The magnetic device for preventing core cracking according to claim 1, characterized in that, The insulating varnish used in the impregnation treatment is either a self-drying type or a baking type.

5. The magnetic device for preventing core cracking according to claim 1, characterized in that, The cross-sections of the central column and the side columns are rectangular or circular.

6. The magnetic device for preventing core cracking according to claim 1, characterized in that, The elastic material layer is a circular or square sheet, and the size of the elastic material layer is less than or equal to the cross-sectional size of the side column.

7. The magnetic device for preventing core cracking according to claim 1, characterized in that, The elastic material layer is made of any one of the following materials: elastic polyurethane, rubber, synthetic fiber, or elastic alloy material, and the thickness of the elastic material layer is greater than 0.1 mm.

8. The magnetic device for preventing core cracking according to claim 1, characterized in that, Insulating tape is wrapped between the coil layers and on the outside of the coil, and there is at least one coil.

9. The magnetic device for preventing core cracking according to claim 1, characterized in that, The frame is a square tube structure, and the frame and the magnetic core are fixed together with adhesive.

10. The magnetic device for preventing core cracking according to claim 1, characterized in that, The central column is fitted inside the frame, and the frame has retaining edges at both ends.

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