A method for forming a flat and ultra-thin power transformer magnetic core

A technology of power transformers and molding methods, applied in the direction of inductance/transformer/magnet manufacturing, circuits, electrical components, etc., to achieve the effects of reduced deformation, high superposition characteristics, and strong stability

Active Publication Date: 2021-09-21
NANTONG HUAXING MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the object of the present invention is to provide a method for forming a flat and ultra-thin power transformer magnetic core, which can realize the selection of suitable particle size and loose specific gravity by improving the material selection and compression molding process. After the raw material powder is mixed, the method of secondary pressing is adopted. The raw material powder is preliminarily formed by the initial pressure to obtain a green body, and then the high-pressure gas mixed with the repairing particles is passed into the mold to force the high-pressure gas to carry the repairing particles through the surface of the green body. , and fill the cracks in the body along the way. In the subsequent final pressing process, not only the body is fully formed, but also the disintegration of the repair particles is pressed to trigger the repair action, and the high-strength integrated repair is realized along the crack, which reduces the deformation of the product. Cracking and other problems can greatly improve the pass rate of the finished magnetic core. The magnetic core formed by the invention is suitable for all kinds of flat power transformers due to its low structure, thin wall, easy heat dissipation, high reliability, easy assembly and serialization. use

Method used

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  • A method for forming a flat and ultra-thin power transformer magnetic core
  • A method for forming a flat and ultra-thin power transformer magnetic core
  • A method for forming a flat and ultra-thin power transformer magnetic core

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Effect test

Embodiment 1

[0047] see Figure 1-2 , a method for forming a flat ultra-thin power transformer magnetic core, comprising the following steps:

[0048] S1. Batching: select suitable raw materials for batching and weighing, and obtain raw material powder after mixing;

[0049] S2. Initial pressing: the raw material powder is preliminarily pressed and formed through a mold to obtain a green body;

[0050] S3. Gap measurement: Introduce high-pressure gas into the mold, and the high-pressure gas is mixed with repair particles, the repair particles are used to fill the surface cracks on the green body, and the excess gas and repair particles 8 are recovered from the other end of the mold;

[0051] S4. Final pressure: apply a simple pressure to the green body to force the repair particles to disintegrate and start to repair the cracks on the green body to obtain a shaped green body;

[0052] S5. Sintering: placing the shaped green body in a sintering furnace for sintering treatment to obtain a ...

Embodiment 2

[0065] The molar percentages of each component in the raw material in step S1 are 51mol% Fe2O3, 25mol% MnO and the remaining ZnO, through the reasonable selection and proportioning of the components, the self-superposition characteristics of the manganese-zinc ferrite core are better than before It is higher and more stable, and also meets the requirements of high core inductance. It is suitable for the needs of high-power power transformers, provides conditions for the miniaturization and high efficiency of power transformers, and is conducive to reducing industrial processing costs and large-scale production. .

[0066] The particle size of the raw material is 80-120 mesh, the loose specific gravity is 1.38g / cm3, the particle diameter of the powder is consistent, and the forming is conducive to the mutual meshing of the pores between the powders. The increase of the density and strength of the green body is controlled from the point of view of the powder. In the process of c...

Embodiment 3

[0071] The molar percentages of each component in the raw material in step S1 are 52mol% Fe2O3, 28mol% MnO and the remaining ZnO, through the reasonable selection and proportioning of the components, the self-superposition characteristics of the manganese-zinc ferrite core are better than before It is higher and more stable, and also meets the requirements of high core inductance. It is suitable for the needs of high-power power transformers, provides conditions for the miniaturization and high efficiency of power transformers, and is conducive to reducing industrial processing costs and large-scale production. .

[0072] The particle size of the raw material is 80-120 mesh, the loose specific gravity is 1.40g / cm3, the particle diameter of the powder is consistent, and the forming is conducive to the mutual meshing of the pores between the powders. The increase of the density and strength of the green body is controlled from the point of view of the powder. In the process of c...

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Abstract

The invention discloses a method for forming a magnetic core of a flat and ultra-thin power transformer, which belongs to the field of soft ferrite materials, and can be realized by improving the material selection and pressing molding process, and selecting raw material powder with suitable particle size and loose specific gravity. After mixing, the method of secondary pressing is adopted. The raw material powder is preliminarily shaped by the initial pressure to obtain a green body, and then the high-pressure gas mixed with repair particles is introduced into the mold to force the high-pressure gas to carry the repair particles through the surface of the green body, and Fill the cracks of the green body. In the subsequent final pressing process, not only the green body is fully formed, but also the disintegration of the repair particles is pressed to trigger the repair action, and the high-strength integrated repair is realized along the crack, which reduces the deformation and cracking of the product. The qualification rate of the finished magnetic core is greatly improved. The magnetic core formed by the invention is suitable for use in various flat power transformers due to its low structure, thin wall, easy heat dissipation, high reliability, easy assembly and serialization.

Description

technical field [0001] The invention relates to the field of soft ferrite materials, in particular to a method for forming a flat and ultra-thin power transformer magnetic core. Background technique [0002] Soft magnetic manganese zinc ferrite cores are mainly used in the manufacture of various inductors, transformers, filters and choke coils, and are widely used in the field of modern electronic information, such as computers and their peripheral equipment, office automation equipment, digital communication equipment , Internet, household appliances, electromagnetic compatibility equipment, green lighting, industrial automation and automotive aerospace and military fields. [0003] With the rapid development of electronic information products, various switching power supplies and adapters emerge as the times require, and at the same time, higher requirements are put forward for the switching power supply circuit and the magnetic device MnZn ferrite core used in it. The ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02
CPCH01F41/02H01F41/0266
Inventor 杨美华
Owner NANTONG HUAXING MAGNETIC MATERIAL
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