Preparation method of magnetic skeleton

A skeleton and magnetic technology, which is applied in the field of magnetic skeleton preparation by 3D printing technology, can solve the problems of complex iron core structure design, residual magnetism of ferromagnetic materials, narrow measurement frequency band, etc. The effect of improving efficiency

Pending Publication Date: 2020-12-15
珠海多创科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

Relatively speaking, the iron core in the iron core transformer has a magnetic gathering effect, a large mutual inductance, a high signal-to-noise ratio, and strong anti-interference ability, but the ferromagnetic material has residual magnetism, and there is a problem of magnetic saturation, which is easy to cause signal distortion
In order to solve the magnetic saturation problem of the iron core caused by non-periodic current, the conventional solution is to open an air gap in the iron core to reduce the residual magnetism, but this will bring about the problem of complex structure design and high cost of the iron core, and the iron core Limited by the performance of ferromagnetic materials, there are shortcomings of narrow measurement frequency band and small dynamic range

Method used

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  • Preparation method of magnetic skeleton
  • Preparation method of magnetic skeleton
  • Preparation method of magnetic skeleton

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Experimental program
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Effect test

Embodiment 1

[0036] In this embodiment, silicon steel is used as a soft ferromagnetic material to prepare a magnetic skeleton applied to a Rogowski coil current transformer, and the steps are as follows:

[0037] Dissolve 2g of silane coupling agent (KH-550) in 200ml of ethanol (solvent), stir evenly, add 1000g of silicon steel powder and mix well, then remove the solvent to complete the surface pretreatment of silicon steel powder; Surface pretreatment is carried out to make the surface of silicon steel powder change from hydrophilic to hydrophobic, so that it can be evenly dispersed into the light-cured resin to form a material with uniform internal magnetic permeability; silicon steel has a high magnetic permeability of weak magnetic field, and its magnetic permeability The ratio is 7000-10000, and the saturation magnetic induction is about 2T; the coupling agent is silane-based KH-550, KH-550 is an amino functional silane, which is alkaline, soluble in organic solvents and water, and is...

Embodiment 2

[0043] The difference between this embodiment and embodiment 1 is that the mixing ratio of silicon steel powder, photocurable resin and additives is 20%:77%:3%.

Embodiment 3

[0048] The difference between this embodiment and the embodiment 1 lies in that the permalloy powder is used as the soft ferromagnetic material to prepare the magnetic skeleton applied to the iron core coil current transformer.

[0049] Dissolve 2g of silane coupling agent (KH-550) in 200ml of ethanol, stir evenly, add 1000g of permalloy powder and mix well, then volatilize the ethanol to complete the surface pretreatment of permalloy powder; As a very high weak magnetic field permeability, the permeability is 20000-200000, and the saturation magnetic induction is about 1T;

[0050] Mix the surface-pretreated permalloy powder with light-curing resin and additives at a ratio of 30%: 69%: 1%;

[0051] According to the size and shape of the required magnetic skeleton, use 3D modeling software for 3D modeling to build a 3D model of a square ring magnetic skeleton. The cross section of the magnetic skeleton is a square with a side length of 10mm, and the square side length inside t...

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Abstract

The preparation method of the magnetic skeleton comprises the following steps: carrying out surface modification pretreatment on soft ferromagnetic powder to change the surface of the soft ferromagnetic powder from hydrophilicity to hydrophobicity; mixing the pretreated soft ferromagnetic powder with light-cured resin to obtain a mixed material; modeling by using three-dimensional modeling software according to the size and the shape of the required magnetic skeleton; and feeding the mixed material into a 3D printer, and printing according to the established model to obtain the magnetic skeleton. The magnetic framework is prepared through 3D printing, the magnetic conductivity of the magnetic framework can be adjusted according to the proportion of soft magnetic powder in a printing material, the flexibility of the magnetic conductivity of the prepared magnetic framework is improved, and compared with a traditional iron core mutual inductor, the prepared magnetic framework has the advantages of being small in residual magnetism, wide in bandwidth and large in dynamic range; and compared with the traditional hollow mutual inductor, the magnetic skeleton has the advantages of stronganti-interference capability and the large signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of current transformers, and in particular relates to a method for preparing a magnetic skeleton by using 3D printing technology. Background technique [0002] Transient current sensors in power systems can generally be divided into iron-core transformers with current output and air-core transformers with voltage output (Rogowski coil) according to the detection principle. These two transformers have their own strengths and can be used in different applications. For example, the air-core transformer has the advantages of large dynamic range and wide frequency band, but its mutual inductance is small and the signal-to-noise ratio is large, and an active integrator is required to amplify the signal, which is not suitable for long-distance transmission. Relatively speaking, the iron core in the iron core transformer has a magnetic gathering effect, a large mutual inductance, a high signal-to-noise ratio, and s...

Claims

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Application Information

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IPC IPC(8): H01F41/02
CPCH01F41/0206
Inventor 刘明关蒙萌胡忠强毛若浩朱家训
Owner 珠海多创科技有限公司
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