WO2020199373A1 - Transformer, amorphous alloy three-dimensional wound core and preparation method therefor - Google Patents

Abstract

Disclosed are a transformer, an amorphous alloy three-dimensional wound core and a preparation method therefor. The amorphous alloy three-dimensional wound core comprises a plurality of single-frame core bodies, wherein each of the single-frame core bodies comprises an annular support frame and a plurality of layers of amorphous bands wound around the support frame; and clearances between every two adjacent layers of the amorphous bands and clearances between the innermost layers of the amorphous bands and the support frames are filled with a damping layer, such that the clearances can be sealed and have a certain strength, and the vibration of the iron core and the noise generated by the vibration can be greatly reduced.

Description

Transformer, amorphous alloy three-dimensional wound iron core and preparation method thereof

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on April 4, 2019, the application number is 201910272785.0, and the invention title is "a transformer, amorphous alloy three-dimensional wound core and its preparation method", all of which The content is incorporated in this application by reference.

Technical field

The invention relates to the technical field of transformers, in particular to a transformer, an amorphous alloy three-dimensional wound core and a preparation method thereof.

Background technique

Amorphous alloy materials have high saturation magnetic induction and extremely low iron loss, so they can replace silicon steel and some soft ferrites in the iron core materials of various medium and high frequency power electronic equipment (such as transformers). Small device volume, reducing equipment energy consumption.

Amorphous alloy material is a new material manufactured by rapid solidification technology. Amorphous iron core is formed by winding or stacking and extruding several layers of amorphous ribbons (belt-shaped amorphous alloy materials). Due to the influence of the characteristics of the strip itself, the layers of the amorphous iron core cannot be over-clamped. At the same time, the magnetostriction of the amorphous alloy is about 10% higher than that of the silicon steel sheet. The vibration of the amorphous iron core caused by expansion and contraction is less restricted, which is prone to generate larger noise and affect the use of the equipment.

Therefore, how to provide an amorphous alloy iron core that is not easy to generate noise is still a technical problem to be solved by those skilled in the art.

Summary of the invention

The purpose of the present invention is to provide a transformer, an amorphous alloy three-dimensional wound core and a preparation method thereof, wherein the amorphous alloy three-dimensional wound core has low noise.

In order to solve the above technical problems, the present invention provides an amorphous alloy three-dimensional wound iron core, including a plurality of single-frame cores. The single-frame core includes a ring-shaped support frame and a plurality of layers of non-crystalline alloy wound around the support frame. Crystal belt; the gap between the two adjacent layers of the amorphous belt, the gap between the innermost layer of the amorphous belt and the support frame are filled with a damping layer.

In the amorphous alloy three-dimensional wound core provided by the present invention, the gap between two adjacent layers of amorphous ribbons of the single frame core body and the gap between the innermost amorphous ribbon and the support frame can be filled with a damping layer, In this way, the gap can be sealed and has a certain strength, which can greatly reduce the vibration of the iron core and the noise generated thereby.

Optionally, the damping layer is formed by immersing and curing the single-frame core in an adhesive, and the thickness of the damping layer is less than 0.1 mm.

Optionally, the impregnation condition is one of vacuum, hydrostatic pressure and natural penetration; the material of the adhesive is epoxy resin, cyanoacrylate, silica gel, polyurethane, ethyl acetate, rubber adhesive, heat One of melt glue and terminal silyl modified polymer.

Optionally, the outer surface of the single frame core is further provided with a noise reduction layer.

Optionally, the material of the noise reduction layer is noise reduction glue, the loss factor of the noise reduction glue is 0.3-1.3, and the thickness of the noise reduction layer is greater than 0.2 mm.

Optionally, the material of the noise reduction adhesive is one of high-strength, impact-resistant, creep-resistant damping paint, epoxy adhesive, and polyurethane.

Optionally, the noise reduction layer is formed by coating and curing the noise reduction glue on the surface of the single frame core under normal temperature or heating conditions.

The present invention also provides a method for preparing an amorphous alloy three-dimensional wound core, which is suitable for the above-mentioned amorphous alloy three-dimensional wound core. The preparation method includes: step S1, preparing the single frame core; step S2, The single frame core is pushed into an annealing furnace for magnetic field annealing; step S3, the single frame core after magnetic field annealing is immersed in an adhesive to form the damping layer; step S4, the amorphous alloy three-dimensional Rolled iron core.

Optionally, after the step S3 and before the step S4, the method further includes: step S31, coating a noise reduction glue on the surface of the single frame core body after the damping layer is formed to form a noise reduction layer.

The present invention also provides a transformer including an iron core, and the iron core is the above-mentioned amorphous alloy three-dimensional wound iron core.

Description of the drawings

Fig. 1 is a schematic structural view of a specific embodiment of an amorphous alloy three-dimensional wound core provided by the present invention;

Figure 2 is a partial view of a single frame iron core;

Fig. 3 is an enlarged partial cross-sectional view of the single-frame iron core in Fig. 2.

The reference signs in Figures 1-3 are explained as follows:

1 single frame core, 11 support frame, 12 amorphous ribbon, 13 damping layer;

2 Noise reduction layer.

detailed description

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

As used herein, "several" refers to an indefinite number, usually two or more; and when "several" is used to indicate the number of certain parts, it does not mean the mutual relationship of these parts in quantity.

Please refer to FIGS. 1-3. FIG. 1 is a schematic structural diagram of a specific embodiment of an amorphous alloy three-dimensional wound core provided by the present invention. FIG. 2 is a partial view of a single frame iron core, and FIG. 3 is a single frame in FIG. 2 An enlarged view of a partial cross-section of the iron core.

Example one

As shown in Figure 1, the present invention provides an amorphous alloy three-dimensional wound iron core, including a plurality of single-frame cores 1. Specifically, three single-frame cores 1 with the same structure can be enclosed. The outer edge of the single-frame core 1 is approximately square as a whole, and the cross-section of the frame edge of the single-frame core 1 can be approximately semicircular or half a polygon, so that when the frame edges of the two single-frame cores 1 are facing each other, it can form The cross-section is an approximately circular or approximately polygonal stem.

The above-mentioned single-frame core body 1 includes a support frame 11 having a ring shape and a plurality of layers of amorphous ribbons 12 wound around the support frame 11. During the specific installation, several levels of amorphous ribbons 12 with different widths can be prepared. The support frame 11 can be located at the innermost layer. The first-level amorphous ribbon 12 can be wound around the support frame 11, and then can be wound from the inside to the outside. The amorphous ribbons 12 at various levels are formed to form a single-frame core 1 with a specific shape. Here, the embodiment of the present invention does not limit the number of stages of amorphous ribbons 12 with different widths. In practical applications, those skilled in the art can make selections according to actual needs; in an exemplary solution, the above-mentioned amorphous ribbons 12 can be set to 7-25 levels. Regarding how to wind the amorphous ribbon 12, reference can be made to the prior art, which will not be described in detail here. The ring here can be a circular ring, a square ring, a rectangular ring, a waist circular ring or other special-shaped rings, etc.; taking a rectangular ring as an example, the rectangular ring can be a one-piece structure or two The "└" shaped board is assembled, or it can be assembled from four straight boards.

After the single-frame core 1 is formed, it can be pushed into an annealing furnace for magnetic field annealing to eliminate internal stress and restore magnetism.

The single-frame core 1 formed by the above-mentioned solution is affected by the characteristics of the amorphous ribbon 12, and the layers of the amorphous ribbon 12 cannot be wound too tightly, and the amorphous ribbon 12 itself has high magnetostriction. Characteristic. When in use, the amorphous ribbon 12 of each layer is prone to periodic vibrations due to the alternating magnetic flux, thereby generating noise.

In response to this, in conjunction with FIG. 3, the present invention provides an amorphous alloy three-dimensional wound core, the gap between two adjacent layers of amorphous ribbons 12 of the single frame core 1, and the innermost amorphous ribbon 12 and the support frame 11 The gaps between them can be filled with a damping layer 13, so that the gaps can be sealed, and have a certain strength, which can greatly reduce the vibration of the iron core and the noise generated thereby.

It should be noted that the single frame core 1 after magnetic field annealing does not necessarily have a gap between two adjacent layers of amorphous ribbons 12, and between the innermost amorphous ribbon 12 and the support frame 11. If there is no gap , Then there is no damping layer 13 between them.

Specifically, the above-mentioned damping layer 13 can be formed by dipping the single-frame core 1 in an adhesive and curing it by drying (air drying or heating at room temperature). The dipping process can be performed under ambient temperature and ambient pressure conditions, or It is carried out under vacuum, hydrostatic pressure or natural penetration conditions to promote better filling of the adhesive.

In this way, the surface of the formed damping layer 13 is flatter and the thickness is more uniform. The thickness of the damping layer 13 can be less than 0.1 mm to reduce the drying and curing time; and after adopting the above solution, the surface of the single frame core 1 is also The aforementioned damping layer 13 can be formed. The entire single-frame core 1 is equivalent to being solidified and combined by the adhesive into a whole, which can ensure sufficient strength and mechanical integrity, and facilitate installation. During installation, the damping of the surface of the single-frame core 1 The elasticity of the layer 13 can also improve the stress sensitivity of the single frame core 1, and can avoid the deterioration of the magnetic performance of the iron core due to stress problems in the subsequent process; in addition, after the above-mentioned solution is used, it can also greatly Reduce the no-load loss of the iron core.

Here, the embodiments of the present invention do not limit the types of the above-mentioned adhesives. During implementation, those skilled in the art can choose according to actual needs; for example, the material of the adhesive can be epoxy resin, cyanoacrylate, silicone, polyurethane, Ethyl acetate, rubber-based adhesives, hot melt adhesives, and silyl-terminated modified polymers.

Preferably, the viscosity of the aforementioned adhesive may be less than 300 Pa.s, the thermal expansion coefficient may be greater than 3 ppm/°C, the shear strength may be greater than 0.2 MPa, and the high temperature resistance may be greater than 80°C. Based on this, in specific practice, low-viscosity adhesives such as epoxy resin, cyanoacrylate, ethyl acetate, etc. can be used; taking ethyl acetate as an example, the curing shrinkage rate is relatively low, and the formed damping layer 13 is bonded The capacity and elasticity are high, and the influence on the stress, initial permeability and inductance of the iron core itself is small, which is a preferred solution of the embodiment of the present invention.

In addition to the dipping process, the above-mentioned damping layer 13 may also be formed by dipping, spraying, brushing or electrostatic deposition, etc. The specific details of the related process technology can refer to the prior art, which will not be described in detail here.

As shown in Figure 2, after the damping layer 13 is formed, the outer surface of the single-frame core 1 can also be provided with a noise reduction layer 2. The material of the noise reduction layer 2 can be a type of noise reduction glue with a higher loss factor. , It can weaken the vibration during the operation of the transformer and further reduce the noise.

The loss factor of the above-mentioned noise reduction adhesive can be between 0.3-1.3. Specifically, it can be one of high-strength, impact-resistant and creep-resistant damping coatings, epoxy adhesives, and polyurethanes. Among them, epoxy adhesives have high adhesion and shrinkage. The low rate and high dielectric performance are a preferred solution of the embodiment of the present invention.

In specific practice, the epoxy resin and curing agent can be mixed with a weight ratio of 1.5:1 to 2.5:1 to obtain the above-mentioned epoxy adhesive. Here, the embodiment of the present invention does not limit the type of the above-mentioned curing agent. In fact, the type of curing agent is different, the performance of the formed epoxy adhesive will also be quite different. In practical applications, those skilled in the art can according to needs. Make a selection.

The noise reduction layer 2 can be formed by coating the noise reduction glue on the surface of the single frame core 1 under normal temperature or heating conditions, and then drying (air drying or heating at room temperature) to form a coating (ie, reducing The thickness of the noise layer 2) is relatively thin, which can greatly shorten the curing time and facilitate rapid drying. The thickness of the noise reduction layer 2 can be determined according to requirements. In an exemplary solution, the thickness of the noise reduction layer 2 can be set to be greater than 0.2 mm.

Using the above solutions, the outer surface of the final single-frame core 1 may have two layers of protection. The inner layer of protection is the damping layer 13, and the outer layer is the noise reduction layer 2. The two layers of protection work together to It is better to connect the support frame 11 and each layer of the amorphous tape 12 as a whole, which can reduce the noise to a greater extent; and the damping layer 13 can be filled between each layer of the amorphous tape 12 to seal the gap between the layers , And ensure the strength, can further reduce the noise; moreover, when the amorphous alloy three-dimensional wound core is assembled, the damping layer 13 and the noise reduction layer 2 at the butt of the two single frame cores 1 can give full play to both Elasticity to improve the stress sensitivity of the butt joint of the single-frame core body 1, thereby better ensuring the performance of the iron core during long-term use.

Example two

Based on the amorphous alloy three-dimensional wound core in the first embodiment, the present invention also provides a method for preparing the amorphous alloy three-dimensional wound core. The preparation method includes the following steps:

Step S1, preparing a single frame core 1;

Specifically: prepare several levels of amorphous ribbons 12 with different widths, set the support frame 11 in the innermost layer, and wind the first-level amorphous ribbon 12 around the support frame 11, and then wrap the above-mentioned non-crystalline ribbons 12 from the inside to the outside.晶带12.

Step S2: Push the single frame core 1 into an annealing furnace for magnetic field annealing to eliminate internal stress and restore magnetism;

Step S3, immersing the single frame core 1 after the magnetic field annealing in the adhesive to form the damping layer 13;

Regarding the type of adhesive and the related conditions of dipping, please refer to the first embodiment, which will not be repeated here.

Step S4, preparing an amorphous alloy three-dimensional wound core.

In a specific embodiment, as shown in Figure 1, three single-frame cores 1 can be set, and then the frame edges of the three single-frame cores are butted to form a "triangular" style amorphous alloy three-dimensional roll Iron core.

The above-mentioned preparation method can be used to obtain the amorphous alloy three-dimensional wound core in the first embodiment. Since the amorphous alloy three-dimensional wound core in the first embodiment already has the above technical effects, then the material suitable for the core The preparation method provided by the embodiment should also have similar technical effects, so it will not be repeated here.

Further, after step S3 and before step S4, the method may further include: step S31, coating a noise reduction glue on the surface of the single-frame core 1 after the damping layer 13 is formed to form the noise reduction layer 2. The noise reduction layer 2 can cooperate with the damping layer 13 to better exert the technical effect of noise reduction; the type, coating method and thickness of the noise reduction glue can refer to Embodiment 1, and will not be repeated here.

Example three

The present invention also provides a transformer including an iron core, which is the amorphous alloy three-dimensional wound iron core involved in the first embodiment.

Since the above-mentioned amorphous three-dimensional wound iron core already has the above technical effects, the transformer with the amorphous three-dimensional wound iron core should also have similar technical effects, so it will not be repeated here.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered This is the protection scope of the present invention.

Claims (10)

1. An amorphous alloy three-dimensional rolled iron core, comprising a plurality of single-frame cores (1). The single-frame core (1) includes a ring-shaped support frame (11) and a coil wound around the support frame (11). Several layers of amorphous ribbons (12), characterized in that the gap between the two adjacent layers of amorphous ribbons (12), the innermost layer of amorphous ribbons (12) and the support frame (11) The gaps between are filled with a damping layer (13).
2. The amorphous alloy three-dimensional wound core according to claim 1, wherein the damping layer (13) is formed by dipping and curing the single-frame core body (1) in an adhesive, and the damping layer The thickness of the layer (13) is less than 0.1 mm.
3. The amorphous alloy three-dimensional wound core according to claim 2, wherein the immersion condition is one of vacuum, hydrostatic pressure and natural penetration;

   The material of the adhesive is one of epoxy resin, cyanoacrylate, silica gel, polyurethane, ethyl acetate, rubber adhesive, hot melt adhesive, and silyl-terminated modified polymer.
4. The amorphous alloy three-dimensional wound core according to any one of claims 1 to 3, wherein the outer surface of the single-frame core body (1) is further provided with a noise reduction layer (2).
5. The amorphous alloy three-dimensional wound core according to claim 4, wherein the material of the noise reduction layer (2) is noise reduction glue, the loss factor of the noise reduction glue is 0.3-1.3, and the noise reduction The thickness of layer (2) is greater than 0.2 mm.
6. The amorphous alloy three-dimensional wound core according to claim 5, wherein the material of the noise reduction glue is one of high-strength, impact-resistant and creep-resistant damping paint, epoxy glue, and polyurethane.
7. The amorphous alloy three-dimensional wound core according to claim 5, wherein the noise reduction layer (2) is formed by the noise reduction glue on the surface of the single frame core (1) under normal temperature or heating conditions. Coated and cured.
8. A method for preparing an amorphous alloy three-dimensional wound core, characterized in that it is suitable for the amorphous alloy three-dimensional wound core according to any one of claims 1-7, and the preparation method comprises the following steps:

   Step S1, preparing the single-frame core (1);

   Step S2, pushing the single frame core (1) into an annealing furnace for magnetic field annealing;

   Step S3, immersing the single frame core (1) after the magnetic field annealing in an adhesive to form the damping layer (13);

   Step S4, preparing the amorphous alloy three-dimensional wound core.
9. The method for preparing an amorphous alloy three-dimensional wound core according to claim 8, wherein after the step S3 and before the step S4, it further comprises:

   Step S31, coating a noise reduction glue on the surface of the single frame core (1) after the damping layer (13) is formed to form a noise reduction layer (2).
10. A transformer comprising an iron core, characterized in that the iron core is the amorphous alloy three-dimensional wound iron core according to any one of claims 1-7.

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