CN104979079A - A pot-shaped magnetic core monomer and a pot-shaped magnetic core containing it - Google Patents

Abstract

The invention belongs to the technical field of inductor design, and provides a pot-shaped magnetic core monomer which comprises a circular bottom plate with a central hole, a pot wall which is arranged on the circular bottom plate and is in a C-shaped opening ring shape, and a hollow winding post arranged at the central hole on the bottom plate; the hollow winding post and the tank wall form an annular gap; a wire outlet groove is arranged on the circular bottom plate corresponding to the opening of the tank wall; the bottom plate and the tank wall form an outer frame. Compared with the prior art, the invention has the beneficial effects that: the magnetic core has the advantages of slow surface temperature rise, long service life, simple structure, easy processing, convenient winding, suitability for mechanical production, easy cost control and wide application range. The invention also provides a pot-type magnetic core, which comprises two pot-type magnetic core monomers, wherein the two pot-type magnetic core monomers are in a structure that the bottom plate faces outwards and the openings are superposed in the same direction.

Description

A pot-shaped magnetic core monomer and a pot-shaped magnetic core containing it

technical field

The invention belongs to the technical field of inductor design, and relates to a pot-shaped magnetic core monomer and a pot-shaped magnetic core containing it.

Background technique

Traditional reactors, inductors, transformers and other magnetic components are generally in the shape of ring, EE, EI, ETD and so on. The ring structure has the advantage of being a closed magnetic circuit as a whole, the leakage flux is relatively small, the magnetic density is relatively uniform, and the overall utilization rate of the magnetic core is high, but its disadvantage is that the winding is troublesome and often requires manual operation, which cannot be carried out Automated production; EE, EI, ETD shape structure is adopted, the advantage is that the processing is simple, and it is convenient for automatic production, but it is easy to cause magnetic flux leakage and edge magnetic flux.

Therefore, it is necessary to provide an improved technical solution to overcome the technical problems existing in the prior art.

Contents of the invention

The object of the present invention is to provide a magnetic core magnetic element capable of electromagnetic compatibility and excellent performance.

In order to achieve the above object, the present invention provides a pot-type magnetic core monomer, which includes a circular bottom plate with a central hole, a tank wall with a C-shaped opening on the circular bottom plate, and a A hollow winding post at the central hole; the hollow winding post forms an annular gap with the tank wall; a circular bottom plate corresponding to the opening of the tank wall is provided with an outlet groove; the bottom plate and the tank wall consist of Outer frame;

In terms of material selection, the following three structures are included:

In the first type, the hollow winding post and the outer frame are made of the same magnetic material.

In the second type, the hollow winding post and the outer frame are made of different magnetic materials.

The third type. The outer frame is a single magnetic material structure, and the hollow winding post is a single magnetic material structure or a composite structure of multiple magnetic materials.

Wherein, the magnetic material used for the outer frame includes HTC200 magnetic powder core, FeSi, FeSiAl, FeSiNi, FeNi, FeNiMo, KAH, KAM; the material used for the hollow winding post includes HTC200 magnetic powder core, FeSi, FeSiAl, FeSiNi, FeNi, FeNiMo , KAH, KAM, ferrite, amorphous, silicon steel sheet.

The first structure, such a design can obtain high DC-Bias characteristics, so that under certain premise, it can reduce the production cost, including copper wire cost and material cost, and can make it more miniaturized and improve space utilization efficiency .

The second structure makes the structure more flexible. This method is more flexible. In the case of large loss and high temperature rise, the hollow winding post and the outer frame material can be changed, and the hollow winding post is preferentially changed. It is more reasonable, because the hollow winding post is the winding part, and the heat dissipation area and space are small, so materials with small unit loss can be used for reasonable configuration.

The third structure is more flexible than the second structure. By further refining the hollow winding column to form a composite structure of various materials, it can more effectively balance cost control and work effect optimization.

The present invention also provides a pot-shaped magnetic core, which includes two pot-shaped magnetic core monomers, and the two pot-shaped magnetic core monomers have a stacked structure with the bottom plate facing outwards and openings in the same direction.

Preferably, a booster layer is arranged between the two pot-type magnetic core monomers. In the application of high-power reactance and inductance devices, the passing current is quite large, and the high-frequency alternating loss also becomes larger. When it is necessary to ensure a certain design inductance, it is necessary to consider changing the magnetic circuit structure, the number of winding turns, etc. Conditions, heightening the magnetic core can increase le, and under the condition of weighing the design, it is possible to reduce the H value, thereby increasing the load sense. As the space position increases, the temperature rise caused by loss can be partially alleviated by increasing the heat dissipation area.

Compared with prior art, the beneficial effect of the present invention is:

The surface temperature of the magnetic core rises slowly, the service life is long, and the structure is simple, easy to process, convenient to wind, suitable for mechanized production, easy to control the cost, and has a wide range of applications.

Description of drawings

FIG. 1 is a schematic structural view of a pot-type magnetic core unit according to the present invention.

Fig. 2 is a schematic structural view of the pot-shaped magnetic core of the present invention.

Fig. 3 is a schematic structural diagram of a pot-shaped magnetic core with an increased layer.

Fig. 4 is a structural schematic diagram of a pot-type magnetic core in which the hollow winding post part is designed as a composite material structure.

Among them, 1. Hollow winding post

2. Tank wall

3. Annular void

4. Outlet slot

5. Bottom plate

6. Increase the height

Detailed ways

Referring to Fig. 1, the pot-type magnetic core monomer provided by the present invention includes a circular bottom plate with a central hole, a tank wall with a C-shaped opening ring on the circular bottom plate, and a Hollow winding column; the hollow winding column and the tank wall form an annular gap; the circular bottom plate corresponding to the opening of the tank wall is provided with an outlet groove; the bottom plate and the tank wall form an outer frame.

Referring to FIG. 2 , the pot-shaped magnetic core provided by the present invention is a pot body composed of two single pot-shaped magnetic cores with the bottom plate facing outward and the openings stacked in the same direction.

Referring to FIG. 3 , another can-shaped magnetic core structure provided by the present invention is provided with a raised layer between two can-shaped magnetic core monomers.

Example 1

Referring to Figure 2, the outer frame and hollow winding post of the pot-type magnetic core are made of a material NF60 (FeSiSeries), and its specific performance after testing is shown in Table 1:

Table 1

The table lists some magnetic performance characteristic data of pot cores, inductance, DC loading characteristics, core loss, etc. The typical loss characteristic curve and DC-Bias characteristic curve are listed below.

Table 2 is the loss characteristic curve

Table 3 is the DC-Bias characteristic curve

The above part describes the electrical characteristics of the pot core in Example 1. Table 2 and Table 3 illustrate that it has relatively low core loss characteristics and extremely high DC bias capability. Especially on the DC-Bias, when the HDC is 200Oe, the DC bias capability is above 65%. This performance is one of the few in the metal magnetic powder core, so it also shows that it is applied under high power, especially high current conditions. The significant advantages of this technology can effectively save materials and use space, making the equipment safer, more reliable and miniaturized. In this embodiment, the pot-shaped magnetic core can also be made of other materials, such as HTC200 magnetic powder core, FeSiAl, FeSiNi, FeNi, FeNiMo, KAH, KAM, etc., not limited to NF60 (FeSiSeries) materials, different materials will have different electromagnetic Features, can design and manufacture cost-effective products according to specific requirements.

Example 2

Referring to Figure 4, the outer frame of the pot-shaped magnetic core is made of NF60 (FeSiSeries) material, and the hollow winding post is composed of two materials: NF60 (FeSiSeries) and S60 (FeSiAlSeries). The specific performance of the tested performance is shown in Table 4:

Table 4

The table lists some magnetic characteristic data of the pot-shaped magnetic core of embodiment 2, inductance, DC loading characteristics, magnetic core loss, etc. The core loss of the pot core is compared with DC-Bias:

Table 5 is the loss characteristic comparison curve

Table 6 is the DC-Bias characteristic comparison curve

This example improves the hollow winding post of the magnetic pot core and transforms it into a composite configuration. FeSiAl (S60) and FeSi (NF60) are used for combination and matching, and the low loss characteristics of sendust and iron-silicon materials are used respectively. The high DC bias characteristic is more reasonable and appropriate. In some specific technical occasions, both loss and DC-Bias can be considered, which can well reduce product temperature rise and is more conducive to the miniaturization of equipment.

Example 3

Referring to Fig. 2, the outer frame of the pot-shaped magnetic core of this embodiment is made of NF60 (FeSi Series) material, and the hollow winding post is made of S60 (FeSiAlSeries) material. The main advantage is that the loss is significantly reduced on the basis of Embodiment 1. And the cost of materials will be reduced. Design input electrical conditions: Irms/35A, Li: 125μH, switching frequency: 5kHz, litz10mm ² /23Ts inverter output filter inductor, under these conditions, using PC, the pot core of Example 1 and Example 2 In fact, the pot-shaped magnetic core design can meet the load inductance requirements. After comprehensive evaluation, the pot-shaped magnetic core of this embodiment is given priority. The following table shows the loss logarithmic curves under the condition of using frequency 5kHz and different AC magnetic densities:

Table 7 is the loss characteristic curve

Set the high-frequency ripple component to 20%, and analyze and calculate according to △BNA=Li△I. Through comparison, it can be known that the Pcv of the two at the working point will be very different. The pot-type magnetic core of this embodiment is more It has decreased by about 43%, so this design method can significantly reduce and improve the overall loss and temperature rise of the magnetic core, and improve the efficiency of the whole machine.

This example shows that under different usage environments, the pot-type magnetic core can be combined and optimized for selection, not limited to a single material, but can be used in a composite configuration through the comparison of various material properties and electrical analysis and calculation. So that the circuit can reach the best running state, so that the product is cheap and beautiful.

Example 4

Referring to Fig. 3, the material of the outer frame of the pot-type magnetic core and the hollow winding post in this embodiment are both NF60 (FeSiSeries), and the design of stacking and heightening is carried out. 60A, Li: 395μH filter inductor, using PC100Series, it is obvious that the pot core in Example 1 cannot meet the actual requirements, because the internal space is not enough, and it is difficult to wind multi-turn copper wires, so this example adopts quite To increase the height of the pot-shaped magnetic core in Example 1, the winding is used: litz16mm ² /50TS, analysis and calculation: L0=AL*N ² /1000=510μH, H=0.4*3.14*N*I/le= 109.4Oe, the DC bias percentage is about 85.0% under this magnetic field condition, the calculated loading inductance Li=L0*0.85=433.5μH, the calculated inductance after loading is greater than the electrical design input inductance condition of 395μH, so it meets the design requirements.

The magnetic material designed in the above embodiments can also use other materials such as HTC200 magnetic powder core, FeSiAl, FeSiNi, FeNi, FeNiMo, KAH, KAM and the like.

Claims (6)

1. a pot type magnetic core monomer, it is characterized in that, comprises the circular bottom plate (5) that has central hole, is arranged on the circular bottom plate (5) and is the tank wall (2) of C-type opening ring shape , the hollow coil post (1) that is arranged at the center hole place on the bottom plate (5); The hollow coil post (1) and the tank wall (2) form an annular gap (3); located in the tank A circular bottom plate (5) corresponding to the opening of the wall (2) is provided with an outlet groove (4); the bottom plate (5) and the tank wall (2) form an outer frame. 2. The pot-type magnetic core monomer according to claim 1, characterized in that: the hollow winding post (1) and the outer frame are made of the same magnetic material. 3. The pot-type magnetic core unit according to claim 1, characterized in that: the hollow winding post (1) and the outer frame are made of different magnetic materials. 4. The pot-type magnetic core monomer according to claim 1, characterized in that: the outer frame is a single magnetic material structure, and the hollow winding post (1) is a single magnetic material structure or a composite of multiple magnetic materials structure. 5. The pot-type magnetic core monomer according to claim 2, 3 or 4, characterized in that: the magnetic material used for the outer frame includes HTC200 magnetic powder core, FeSi, FeSiAl, FeSiNi, FeNi, FeNiMo, KAH, KAM; The materials used for the hollow winding column (1) include HTC200 magnetic powder core, FeSi, FeSiAl, FeSiNi, FeNi, FeNiMo, KAH, KAM, ferrite, amorphous, silicon steel sheet. 6. A pot-shaped magnetic core, characterized in that it comprises two pot-shaped magnetic core monomers, and the two pot-shaped magnetic core monomers have a stacked structure with the bottom plate (5) facing outwards and openings in the same direction. The pot-shaped magnetic core according to claim 6, characterized in that: an additional layer (6) is arranged between two pot-shaped magnetic cores.