A magnetic core with a linear hysteresis loop

Abstract

The invention discloses a magnetic core with a linear hysteresis loop. The magnetic core comprises a magnetic core body, wherein the magnetic core body is made of iron-based nanocrystal soft magnetic alloy, and the iron-based nanocrystal soft magnetic alloy comprises the following constituents according to atomic ratios: 72-76 parts of iron, 12-16 parts of silicon, 5.2-7.5 parts of boron, 1.5-3 parts of niobium, 1-1.8 parts of vanadium, 0.8-1.1 parts of copper and 0.2-3 parts of rare metal. The magnetic core is provided with the linear hysteresis loop, the residual magnetic flux density Br is smaller than 0.02T, the coercivity is smaller than 1.5A / m, the saturation flux density is larger than 1.1T, and the linear magnetic conductivity of different magnetic cores which are produced can be controlled between 1,500 and 35,000.

Description

technical field [0001] The invention relates to the technical field of magnetic cores, in particular to a magnetic core with a linear hysteresis loop. Background technique [0002] Iron-based nanocrystalline soft magnetic alloys have been widely used in high-precision transformers, inductors, and high-frequency power supplies because of their ultra-high magnetic permeability and extremely low core loss. The hysteresis loop of soft magnetic alloys is usually a closed loop composed of two non-overlapping curves, but in the field of anti-DC component transformers and other fields, a soft magnetic alloy with a linear hysteresis loop is needed. When the value of residual magnetic induction intensity Br and coercive force is required to be very small. [0003] Chinese patent 201310191327.7 discloses a constant permeability magnetic core and its manufacturing method and application. The molecular formula of the alloy is Fe a m b Cu c Nb d sn e Si f B g M' h x i , wherein ...

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Problems solved by technology

[0004] Chinese patent 201410771750.9 discloses an iron-based constant magnetic permeability nanocrystalline magnetic core and its preparation method. The molecular formula of the iron-based alloy is Fe a Cu b Nb c Si d B e m f x g , where M is at least one of the elements V, Ti, Mn, Cr, and Mo. The invention discloses that by adjusting the process parameters such as the tension and temperature value in the heat treatment process, constant magnetic permeability can be obtained, and the magnetic permeability Magnetic cores whose rate is highly adjustable in direct current and alternating current, but the composition of the invention does not involve two elements, Ni and Co, and the remanence ratio of the embodiments numbered 1 to 4 in item [0069] is 0.42% , the value of residual magnetic induction Br converted from this is 0.005T, which is already very small, but the coercive force at this time is as high as 15.29A / m, which is quite large, and the hysteresis loop at this time is in the linear segment Obvious misalignment at both ends

[0005] Chinese patent 20140376525.5 discloses a nanocrystalline soft magnetic alloy with constant magnetic permeability, high saturation magnetic induction, and a permeability change rate within 1% and its preparation method. The announced magnetic permeability is constant at 20,000, and the saturation magnetic induction is It is 1.3T, but the invention does not describe the hysteresis loop, nor publish the hysteresis loop diagram

In addition, in all the published examples, the components such as iron and boron vary greatly, but the magnetic permeability of all examples is constant at 20,000, and the rate of change is within 1%. Its scientific and engineering reference has yet to be demonstrated

[0006] Chinese patent 201210536089.4 discloses a constant permeability magnetic core material and preparation method for an anti-DC component transformer. The amorphous constant permeability magnetic core prepared by this invention has low remanence and coercive force, and high saturation magnetic induction. , but the invention does not describe the hysteresis loop, nor publish the hysteresis loop diagram. In addition, the invention iron core involves an amorphous alloy, not a nanocrystalline alloy

[0007] The literature "Effect of Ni on the Constant Magnetic Properties of FeCuNbSiB Nanocrystalline Alloy" reports that after transverse magnetic heat treatment, the residual magnetic induction intensity of the iron core decreases gradually with the increase of Ni content. When the Ni content is 15%, the Fe 61 Ni 15 Cu 1 Nb 3 Si 11 B 9 Alloy, the remanence ratio reaches the minimum, which is 0.0107. It is found that the Ni content of more than 5% will improve the constant magnetic permeability of the alloy and improve the anti-DC bias performance of the iron core, but it is worth noting that the Fe in this literature 61 Ni 15 Cu 1 Nb 3 Si 11 B 9 The initial magnetic permeability of the alloy is 1270, while the maximum magnetic permeability is 6540, and the magnetic permeability changes relatively greatly; while the other component Fe 69 Ni 7 Cu 1 Nb 3 Si 11 B 9 The initial magnetic permeability of the alloy is 6080, the maximum magnetic permeability is 6400, and the change of magnetic permeability is relatively small, but the remanence ratio at this time is 0.1070, which is relatively large. The hysteresis loops of the two alloys are approaching It is in the linear hysteresis loop, but it has not yet reached a satisfactory state, and the composition reported in the literature contains a large amount of expensive nickel, which will lead to a substantial increase in the cost of nanocrystalline alloys

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