Common-mode inductor applying high-stability ultra-crystalline magnetic core and manufacturing method of common-mode inductor

Abstract

The invention discloses a common-mode inductor applying a high-stability ultra-crystalline magnetic core and a manufacturing method of the common-mode inductor. The ultra-crystalline magnetic core with high stability is obtained through controlling vacuum electro-slag remelting, single-roll chilling, molding, ultra-crystallization and distressing processing of the ultra-crystalline magnetic core; and the stability of the common-mode inductor disclosed by the invention is improved through a gap filler which is formed by mixing an aluminum nitride based ceramic framework with excellent electromagnetic performance, a fully enclosed aluminum alloy shielding case and silicone rubber with glass fibers according to a weight ratio of 9: 1. The common-mode inductor applying the high-stability ultra-crystalline magnetic core is high in stability, insensitive to temperature, long in service life, good in electromagnetic shielding performance and excellent in heat dissipation performance.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to a common-mode inductor using a high-stability ultrafine crystal magnetic core and a manufacturing method thereof. Background technique [0002] Inductor is a component that can convert electrical energy into magnetic energy and store it. A common mode inductor is constructed like a transformer, but with only one winding (6). The common mode inductor has a certain inductance, which only hinders the change of current. If the common mode inductor is in the state of no current passing, it will try to block the current flowing through it when the circuit is turned on; if the common mode inductor is in the state of current passing, it will try to maintain the current when the circuit is turned off. Common mode inductors are also called chokes, reactors, and dynamic reactors. [0003] Ultrafine crystal materials have high magnetic permeability, saturation magnetic induction, and ...

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Problems solved by technology

[0004] Among the relevant patents that have been applied in China, the patent "A High Temperature Stability Inductor" (application number: 201610011573.3, publication date: 2016-04-06) discloses the composition structure of a high temperature stability inductor, but its The nature of the material has not been processed and improved, so its temperature stability is poor, and its temperature stability can only be guaranteed through complex structures and heat dissipation, but the skeleton material it uses is plastic, with a large thermal expansion coefficient and stable temperature The magnetic core is N48, which is a kind of NdFeB magnetic core. The advantages of this magnetic core are high cost performance and good mechanical properties. The disadvantages are low Curie temperature point, poor temperature stability and easy Powder corrosion, so its temperature stability is also poor, and its service life is short. At the same time, because its magnetic permeability is much smaller than that of ultrafine crystals, the volume of inductors with the same performance will be much larger than those using ultrafine crystal cores (3). Inductor; due to the aluminum alloy semi-closed structure, although it has a certain electromagnetic shielding ability, compared with the aluminum alloy fully enclosed structure, its electromagnetic shielding ability is weaker and the electromagnetic stability is poor; and because the invention Only a small part of the aluminum alloy is connected to the functional area, and the heat dissipation rate is low

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