CN215417806U

CN215417806U - Inductor

Info

Publication number: CN215417806U
Application number: CN202120204701.2U
Authority: CN
Inventors: 刘开煌; 高鹏; 付松; 虞成城
Original assignee: Shenzhen Sunway Communication Co Ltd
Current assignee: Shenzhen Sunway Communication Co Ltd
Priority date: 2021-01-25
Filing date: 2021-01-25
Publication date: 2022-01-04
Anticipated expiration: 2031-01-25

Abstract

The utility model discloses an inductor, which comprises a magnetic core fixing part, a conductive coil and a magnetic core packaging part, wherein the magnetic core fixing part comprises a magnetic core base, a central magnetic core column and an external magnetic core column; the conductive coil is sleeved on the central magnetic core column and is positioned in the magnetic core gap; the magnetic core packaging part is connected with the magnetic core fixing part, a first accommodating groove matched with the shape of the central magnetic core column is formed in the magnetic core packaging part, and a positioning groove matched with the positioning part is further formed in the magnetic core packaging part; the holding groove that sets up with central magnetic core post shape looks adaptation for magnetic core encapsulation portion can accurately install to the magnetic core fixed part on, has solved the not accurate problem in location that exists among the equipment process, and the location portion cooperation on the constant head tank on the magnetic core encapsulation portion and the outside magnetic core post can further assist the processing location.

Description

Inductor

Technical Field

The utility model relates to the technical field of inductors, in particular to an inductor.

Background

With the rapid development of electronic products, high frequency, integration and miniaturization are the technological development trends. Products such as smart mobile phones, pen power and the like mostly adopt a power management IC to uniformly manage various functional modules, and the power inductor plays a role in reducing ripple current. The power type inductor is generally required to be miniaturized, thinned, high frequency, low DCR, large current, low EMI (electromagnetic interference), and low manufacturing cost. The integrated inductor has the obvious advantage of high current resistance. In addition, the loss of the integrally formed inductor is lower, the conversion efficiency is higher, and the cruising ability of the mobile phone can be effectively improved; the overall size of the integrated inductor is smaller than that of other structures. In addition, the integrally formed inductor also has the following advantages: the electromagnetic property is stable; the temperature rise is stable; low audible noise; the electromagnetic compatibility is good; impact resistance, etc.

The utility model of US patent No. US6204744B1 is to weld the coil with the lead frame after winding, and then to fill powder to form an integrated inductor, the lead frame not only occupies a space equivalent to the volume of the electronic component and is not favorable for manufacturing small-sized electronic components, but also has the problems of poor product stability and reliability caused by insufficient soldering and infirm soldering.

The utility model of the chinese patent with the grant number CN101553891B is to wind the coil directly on the pre-prepared T-shaped magnetic core, the magnetic core column is easy to break, especially under small-sized electronic components, and it is difficult to fully exert the magnetic performance of the material in the finished product because the magnetic core column is cold-pressed in advance.

Therefore, the magnetic material is pre-pressed into each part, then the coil is sleeved on the part to be assembled and then is pressed and formed, so that the small inductor with high inductance value can be obtained, but the problems of inaccurate positioning, poor sealing and the like exist.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: an inductor with precise positioning is provided.

In order to solve the technical problems, the utility model adopts the technical scheme that: an inductor comprises a magnetic core fixing part, a conductive coil and a magnetic core packaging part, wherein the magnetic core fixing part comprises a magnetic core base, a central magnetic core column and an external magnetic core column, the central magnetic core column is arranged in the center of the magnetic core base, the external magnetic core column is arranged on the magnetic core base around the central magnetic core column and forms a magnetic core gap with the central magnetic core column, and a positioning part is convexly arranged on the external magnetic core column; the conductive coil is sleeved on the central magnetic core column and is positioned in the magnetic core gap; the magnetic core packaging part is connected with the magnetic core fixing part, a first accommodating groove matched with the central magnetic core column in shape is formed in the magnetic core packaging part, and a positioning groove matched with the positioning part is further formed in the magnetic core packaging part.

Furthermore, the end part of the conductive coil is an electric connection part exposed out of the outer side wall of the external magnetic core column.

Furthermore, an installation groove is formed in the outer side wall of the external magnetic core column, and the electric connection part is located in the installation groove.

Further, the electric connecting part also comprises a conductive metal layer filling the mounting groove, and the conductive metal layer covers the electric connecting part.

Furthermore, the electric connection part is flat and clings to the installation groove.

Furthermore, the cross section of the central magnetic core column is in a shape of a circle, an ellipse, a runway or a regular polygon.

Further, a ratio of a height of the center core leg to a height of the outer core legs is greater than or equal to 1.05 and less than or equal to 1.5.

Furthermore, the height of the conductive coil is greater than that of the external magnetic core column, the height of the conductive coil is less than that of the central magnetic core column, a second accommodating groove for accommodating the conductive coil is further formed in the magnetic core packaging part, and the first accommodating groove is formed in the second accommodating groove.

Further, the positioning portion includes at least one inclined surface abutting against the magnetic core package portion.

Furthermore, the base is provided with an inserting groove, and the central magnetic core column is inserted in the inserting groove.

The utility model has the beneficial effects that: the inductor provided by the utility model has the characteristic of accurate positioning, the first accommodating groove matched with the shape of the central magnetic core column is arranged on the magnetic core packaging part, so that the magnetic core packaging part can be accurately installed on the magnetic core fixing part, the problem of inaccurate positioning in the assembling process is solved, and in the subsequent secondary pressing process, the central magnetic core column can be preferentially deformed along the transverse direction, so that the central magnetic core column is more closely combined with the conductive coil, the magnetic performance can be fully exerted, and higher inductance value and anti-saturation electrical performance are achieved; the positioning groove on the magnetic core packaging part is matched with the positioning part on the external magnetic core column, so that the processing and positioning can be further assisted.

Drawings

Fig. 1 is an assembly view of an inductor according to a first embodiment of the present invention;

fig. 2 is an exploded view of an inductor according to a first embodiment of the present invention;

fig. 3 is a schematic view of a structure in which a positioning portion of an inductor is engaged with a positioning groove according to a first embodiment of the present invention;

fig. 4 is a schematic view of a positioning portion and a positioning groove of another inductor structure according to a first embodiment of the present invention;

fig. 5 is a schematic view of a positioning portion and a positioning groove of an inductor according to another structure of the first embodiment of the present invention;

fig. 6 is an assembly view of an inductor according to a second embodiment of the present invention;

fig. 7 is an exploded view of an inductor according to a second embodiment of the present invention;

fig. 8 is an assembly view of an inductor according to a third embodiment of the present invention;

fig. 9 is an exploded view of an inductor according to a third embodiment of the present invention;

fig. 10 is a partial cross-sectional structural diagram of another structure of an inductor according to a first embodiment of the present invention;

fig. 11 is an assembly view of an inductor according to a fourth embodiment of the present invention;

fig. 12 is an exploded view of an inductor according to a fourth embodiment of the present invention;

fig. 13 is an assembly view of an inductor according to a fifth embodiment of the present invention;

fig. 14 is an exploded view of an inductor according to a fifth embodiment of the present invention.

Description of reference numerals:

1. a magnetic core fixing part; 11. a central core limb; 12. an external core leg; 13. a positioning part; 131. a tooth-shaped portion; 14. a communicating groove; 15. mounting grooves; 16. a conductive metal layer; 17. a magnetic core gap; 18. inserting grooves; 2. a magnetic core encapsulation portion; 21. positioning a groove; 22. a first receiving groove; 23. a second receiving groove; 3. a conductive coil; 31. an electrical connection portion.

Detailed Description

In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.

Referring to fig. 1 to 14, an inductor includes a core fixing portion 1, a conductive coil 3 and a core packaging portion 2, where the core fixing portion 1 includes a core base, a central core post 11 and an external core post 12, the central core post 11 is disposed in the center of the core base, the external core post 12 is disposed on the core base around the central core post 11 and forms a core gap 17 with the central core post 11, and a positioning portion 13 is convexly disposed on the external core post 12; the conductive coil 3 is sleeved on the central magnetic core column 11 and is positioned in the magnetic core gap 17; the magnetic core packaging part 2 is connected with the magnetic core fixing part 1, a first accommodating groove 22 matched with the central magnetic core column 11 in shape is formed in the magnetic core packaging part 2, and a positioning groove 21 matched with the positioning part 13 is further formed in the magnetic core packaging part 2.

From the above description, the beneficial effects of the present invention are: the first accommodating groove 22 matched with the central magnetic core column 11 in shape is arranged on the magnetic core packaging part 2, so that the magnetic core packaging part 2 can be accurately installed on the magnetic core fixing part 1, the problem of inaccurate positioning in the assembling process is solved, and in the subsequent secondary pressing process, the central magnetic core column 11 can be preferentially deformed along the transverse direction, so that the central magnetic core column is more closely combined with the conductive coil 3, the magnetic performance can be fully exerted, and higher inductance value and anti-saturation electrical performance are achieved; the positioning groove 21 on the magnetic core packaging part 2 is matched with the positioning part 13 on the external magnetic core column 12, so that the processing and positioning can be further assisted.

Further, the end of the conductive coil 3 is an electrical connection portion 31 exposed to the outer sidewall of the outer core leg 12.

As is apparent from the above description, the electrical connection portion 31 facilitates the present inductor to establish better electrical connection with an external member.

Further, an installation groove 15 is formed in an outer side wall of the external core limb 12, and the electrical connection portion 31 is located in the installation groove 15.

As can be seen from the above description, the mounting groove 15 facilitates the mounting of the electrical connection portion 31, and can accommodate the electrical connection portion 31, which is beneficial to the improvement of the compactness.

Further, the structure also comprises a conductive metal layer 16 filling the mounting groove 15, wherein the conductive metal layer 16 covers the electrical connection part 31.

As can be seen from the above description, the conductive metal layer 16 can protect the electrical connection portion 31, and at the same time, the electrical contact area of the inductor is increased.

Further, the electrical connection portion 31 is flat and tightly attached to the mounting groove 15.

As can be seen from the above description, the flat electrical connection portion 31 can be more conveniently and stably mounted in the mounting groove 15, and the contact area with the conductive metal layer 16 is increased, so that the bonding force between the electrical connection portion 31 and the conductive metal layer 16 is enhanced.

Further, the cross-sectional shape of the central core post 11 is circular, elliptical, racetrack, or regular polygon.

From the above description, the shape of the central core post 11 can be set according to the actual application requirements, and the diversity of the structure is enriched.

Further, the ratio of the height of the center core leg 11 to the height of the outer core leg 12 is greater than or equal to 1.05 and less than or equal to 1.5.

As can be seen from the above description, the ratio of the height of the central core leg 11 to the height of the outer core legs 12 is greater than or equal to 1.05 and less than or equal to 1.5, which facilitates better bonding of the core package 2 to the core fixing portion 1, and ensures that the magnetic performance is fully exerted to achieve higher inductance and anti-saturation electrical performance.

Further, the height of the conductive coil 3 is greater than that of the external magnetic core column 12, the height of the conductive coil 3 is less than that of the central magnetic core column 11, the magnetic core packaging part 2 is further provided with a second accommodating groove 23 for accommodating the conductive coil 3, and the first accommodating groove 22 is arranged in the second accommodating groove 23.

As can be seen from the above description, the portion of the conductive coil 3 higher than the external core post 12 is located in the second receiving slot 23, so that the magnetic core packaging part 2 can compress the conductive coil 3, thereby enhancing the bonding force between the central core post 11 and the central core post 11, and ensuring that the magnetic performance is fully exerted to achieve higher inductance value and anti-saturation electrical performance.

Further, the positioning portion 13 includes at least one inclined surface abutting against the magnetic core package portion 2.

As can be seen from the above description, the inclined surface can provide a good positioning effect for the installation of the magnetic core package 2, and reduce the risk of misalignment.

Furthermore, the base is provided with an insertion groove 18, and the central core column 11 is inserted into the insertion groove 18.

As can be seen from the above description, the magnetic fixing portion of the inductor may further be configured as a split structure, that is, the outer core post 12 and the central core post 11 are separately manufactured and molded, and the base is provided with the insertion groove 18 to mount the central core post 11, which is beneficial to expanding the design dimension.

The utility model also provides a manufacturing method of the inductor, which comprises the following steps:

s1, preparing a magnetic core fixing portion 1 in advance, where the magnetic core fixing portion 1 includes a magnetic core base, a central core column 11 and an outer core column 12, the central core column 11 is disposed in the center of the magnetic core base, the outer core column 12 surrounds the central core column 11 and is disposed on the magnetic core base and forms a magnetic core gap 17 with the central core column 11, and the outer core column 12 is convexly provided with a positioning portion 13;

s2, winding the conductive coil 3 in advance, and embedding the wound conductive coil 3 on the central magnetic core column 11 of the magnetic core fixing part 1;

s3, preparing a magnetic core package part 2 in advance, wherein the magnetic core package part 2 is provided with a first receiving groove 22 adapted to the shape of the central core column 11 and a positioning groove 21 adapted to the positioning part 13, the magnetic core package part 2 is positioned and mounted on the magnetic core fixing part 1 through the positioning groove 21 and the first receiving groove 22, and performing hot pressing to mold the inductor.

Further, in step S2, the conductive coil 3 is formed by winding a conductive wire having a flat end face, and after the conductive coil 3 is nested in the central magnetic core column 11, two end portions of the conductive coil 3 are respectively led out to the outer sides of the external magnetic core columns 12 to form the electrical connection portion 31.

Further, after the step S3, the method further includes a step S4: and preparing a conductive metal layer 16 on the outer side wall of the outer core limb 12, wherein the conductive metal layer 16 is attached to the electric connection part 31 and is electrically connected with the electric connection part 31.

Further, the outer sidewall of the external core post 12 is opened with a mounting groove 15 for accommodating the electrical connection portion 31 and the conductive metal layer 16.

Further, the conductive metal layer 16 is formed on the outer core leg 12 by electroplating or physical deposition.

Further, in step S3, after the magnetic powder is compression molded into the magnetic core sealing part 2, before the magnetic core sealing part 2 is fixed to the magnetic core fixing part 1 through the positioning groove 21 and the first receiving groove 22, the method further includes a step of filling the magnetic core gap 17 of the magnetic core fixing part 1 with viscous magnetic powder.

Further, the viscous magnetic powder is a non-flowing viscous mixture formed by mixing a magnetic material and a binder, the magnetic material is consistent with the materials of the magnetic core fixing part 1 and the magnetic core packaging part 2, and the binder is one or more of epoxy resin, silicone resin and phenolic resin.

Further, the mass of the viscous magnetic powder accounts for 0.5% -3% of the sum of the mass of the magnetic core fixing part 1 and the mass of the magnetic core packaging part 2.

Further, in step S1, the core base is integrally formed with the outer core leg 12, the central core leg 11 is separately formed, and the core base has a central insertion groove 18 for inserting the central core leg 11.

Example one

Referring to fig. 1 and 5, a first embodiment of the present invention is: an inductor specifically comprises a magnetic core fixing part 1, a conductive coil 3 and a magnetic core packaging part 2, wherein the magnetic core fixing part 1 comprises a magnetic core base, a central magnetic core column 11 and an external magnetic core column 12, the central magnetic core column 11 is arranged in the center of the magnetic core base, the external magnetic core column 12 surrounds the central magnetic core column 11 and is arranged on the magnetic core base, a magnetic core gap 17 is formed between the external magnetic core column 12 and the central magnetic core column 11, and a positioning part 13 is convexly arranged on the external magnetic core column 12; the conductive coil 3 is sleeved on the central magnetic core column 11 and is positioned in the magnetic core gap 17; the magnetic core packaging part 2 is connected with the magnetic core fixing part 1, a first accommodating groove 22 matched with the central magnetic core column 11 in shape is formed in the magnetic core packaging part 2, and a positioning groove 21 matched with the positioning part 13 is further formed in the magnetic core packaging part 2.

Optionally, a ratio of a total height of the core package 2 to a depth of the first receiving slot 22 is greater than or equal to 1.5 and less than or equal to 2.0, the depth of the first receiving slot 22 is between 0.75 and 0.95 times a difference between a height of the center core leg 11 and a height of the outer core leg 12, and a cross-sectional area of the first receiving slot 22 is between 1.02 and 1.05 times a cross-sectional area of the center core leg 11.

Specifically, in this embodiment, the total height of the magnetic core enclosure portion 2 is twice the depth of the first receiving groove 22, so that the risk of breakage of the magnetic core enclosure portion 2 in the machining process can be reduced, and the improvement of the product yield is facilitated.

Preferably, the conductive coil 3 is formed by winding a flat conductive wire, two end portions of the conductive coil 3 are respectively exposed out of the magnetic core fixing portion 1 and form an electrical connection portion 31, and specifically, the electrical connection portion 31 is used for establishing electrical connection between the conductive coil 3 and an external component; more specifically, after the conductive coil 3 is sleeved to the central core post 11, two ends of the conductive coil 3 are respectively led out from the core gap 17, and paint layers on the two ends of the conductive coil 3 are peeled off to form the electrical connection portion 31.

In detail, a communicating groove 14 for two end portions of the conductive coil 3 to penetrate through is formed in the external magnetic core column 12, the communicating groove 14 is formed in the top of the external magnetic core column 12, an electric connection portion 31 is formed at a portion of the conductive coil 3, which penetrates through the communicating groove 14, and in order to ensure the sealing performance of the inductor, the depth of the communicating groove 14 is set to be equal to the thickness of the conductive coil 3; more specifically, an installation groove 15 is formed in the outer side wall of the external core post 12, the installation groove 15 is communicated with the communication groove 14, the electrical connection portion 31 is located in the installation groove 15, the installation groove 15 extends along the height direction of the external core post 12, and the depth of the installation groove 15 is greater than the thickness of the electrical connection portion 31.

Referring to fig. 1, after the magnetic core sealing portion 2 is mounted to the magnetic core fixing portion 1, the mounting groove 15 is filled with a conductive metal layer 16, and the conductive metal layer 16 covers the electrical connection portion 31, it is easy to understand that the conductive metal layer 16 can form a protective effect on the electrical connection portion 31, and at the same time, the electrical contact area of the inductor is increased.

Referring to fig. 2, in this embodiment, the positioning portion 13 is a transverse column protruding from the top of the external core column 12, the positioning slot 21 is a concave groove formed at the bottom of the magnetic core packaging part 2, the transverse column is matched with the groove in shape, and in the process of mounting the magnetic core packaging part 2 to the magnetic core fixing part 1, the positioning portion 13 and the positioning slot 21 are matched to provide precise positioning for the mounting of the magnetic core fixing part 1 and the magnetic core packaging part 2; optionally, the number of the positioning portions 13 may be set according to actual application requirements, the number of the positioning portions 13 and the number of the positioning grooves 21 in this embodiment are two, and the two positioning portions 13 are disposed at the top of the external core limb 12 at intervals.

Specifically, the positioning portion 13 and the positioning groove 21 in the embodiment are in a step-like fit (as shown in fig. 3), and optionally, the positioning portion 13 and the positioning groove 21 may also be in a wedge-shaped block-like fit, that is, the positioning portion 13 includes at least one inclined surface (as shown in fig. 4) abutting against the magnetic core packaging part 2, which is easy to understand that the step-like positioning form and the wedge-shaped positioning form have the advantage of low processing difficulty, and are beneficial to reducing the manufacturing cost; furthermore, a plurality of continuous inclined surfaces can be arranged on the positioning part 13, so that the positioning part 13 is in zigzag fit with the positioning groove 21 (as shown in fig. 5), thus the positioning effect is better, and the risk of installation dislocation of the magnetic core packaging part 2 and the magnetic core fixing part 1 is reduced; the inductor of the present invention includes, but is not limited to, the three positioning forms of the positioning portion 13 and the positioning groove 21 listed above, and the positioning forms can be specifically set according to the actual application requirements.

Optionally, the cross-sectional shape of the central core post 11 may be, but is not limited to, a circle, an ellipse, a runway or a regular polygon, and the shape of the central core post 11 may be set according to actual application requirements, so that the structural diversity is enriched.

In this embodiment, the ratio of the height value of the center core leg 11 to the height value of the outer core leg 12 is 1.25, and the height of the positioning portion 13 is equal to the difference between the height of the center core leg 11 and the height of the outer core leg 12.

The preparation method of the inductor in the embodiment comprises the following steps:

In step S2, the conductive coil 3 is formed by winding a conductive wire having a flat end face, and after the conductive coil 3 is nested in the central magnetic core column 11, two end portions of the conductive coil 3 are respectively led out to the outer sides of the external magnetic core columns 12 to form the electrical connection portion 31.

After the step S3, the method further includes a step S4: and preparing a conductive metal layer 16 on the outer side wall of the outer core limb 12, wherein the conductive metal layer 16 is attached to the electric connection part 31 and is electrically connected with the electric connection part 31.

The outer side wall of the external core limb 12 is provided with a mounting groove 15 for accommodating the electrical connection portion 31 and the conductive metal layer 16.

The conductive metal layer 16 is formed on the external core post 12 by electroplating or physical deposition, specifically, the electroplating is performed by adhering a metal foil to the electrical connection portion 31 of the conductive coil 3, and then performing an electroplating process on the surface of the metal foil to form the conductive metal layer 16; the physical deposition method is to deposit the conductive metal layer 16 in the mounting groove 15 by using a physical vapor deposition process, wherein the conductive metal layer 16 may be made of one or more of tin, nickel, copper, silver and gold

In step S3, after the magnetic powder is compression molded into the magnetic core package portion 2, before the magnetic core package portion 2 is positioned and mounted on the magnetic core fixing portion 1 through the positioning groove 21 and the first receiving groove 22, a step of filling the magnetic core gap 17 of the magnetic core fixing portion 1 with viscous magnetic powder is further included. Specifically, the viscous magnetic powder is a non-flowing viscous mixture formed by mixing a magnetic material and a binder, the magnetic material is consistent with the materials of the magnetic core fixing part 1 and the magnetic core packaging part 2, and the binder is one or more of epoxy resin, silicone resin and phenolic resin.

Preferably, the mass of the viscous magnetic powder accounts for 0.5-3% of the sum of the mass of the magnetic core fixing part 1 and the mass of the magnetic core encapsulating part 2.

Preferably, the magnetic material used for the core fixing part 1 and the core sealing part 2 is one or more of reduced iron powder, atomized iron powder, carbonyl iron powder, iron-silicon-chromium alloy, iron-silicon alloy and iron-based amorphous alloy, and the same or different magnetic materials can be selected for the core fixing part 1 and the core sealing part 2.

In the embodiment, the ratio of the internal hollow sectional area of the wound conductive coil 3 to the central magnetic core column 11 of the magnetic core fixing part 1 is 1.05-1.35, the ratio of the end surface area occupied by the whole wound conductive coil 3 to the sectional area of the magnetic core gap 17 is 0.85-0.99, and the ratio of the winding height of the conductive coil 3 to the height of the external magnetic core column 12 is 0.9-1.1.

In this embodiment, the method includes two compression steps, the magnetic core sealing portion 2 and the magnetic core fixing portion 1 are respectively formed by thermal compression (i.e. a first compression step), and after the magnetic core sealing portion 2 is mounted on the magnetic core fixing portion 1, a second compression step is performed, wherein a pressure value adopted in the second compression step is greater than a pressure value adopted in the first compression step; the first compression procedure can be cold press molding or hot press molding, the second compression procedure is hot press molding, and the molding temperature is 130-.

Example two

Referring to fig. 6 and 7, the second embodiment of the present invention is a further development of the leading-out position of the electrical connection portion 31 on the basis of the first embodiment, and is different from the first embodiment in that: two ends of the conductive coil 3 in this embodiment are respectively led out from the position of the external magnetic core column 12 close to the positioning portion 13, so that the structural style of the inductor is further enriched.

EXAMPLE III

Referring to fig. 8 to fig. 10, a third embodiment of the present invention is a further development on the basis of the first embodiment, and the first difference from the first embodiment is that: the positioning portion 13 is a pillar disposed on the top of the external core pillar 12, specifically, the positioning portion 13 is disposed in the middle of a group of short sides of the external core pillar 12, the end of the conductive coil 3 is led out from the top of the positioning portion 13, a gap for leading out the conductive coil 3 is formed between the positioning groove 21 on the magnetic core packaging portion 2 and the top of the positioning portion 13, the gap forms the communication groove 14, mounting grooves 15 communicating with the communication groove 14 are disposed on the magnetic core packaging portion 2 and the external core pillar 12, and the conductive metal layer 16 is filled in the mounting grooves 15 of the magnetic core packaging portion 2 and the external core pillar 12.

Optionally, after being led out through the communication slot 14, the conductive coil 3 may be bent toward the magnetic core sealing portion 2 and attached to the mounting slot 15 on the magnetic core sealing portion 2, or bent toward the external magnetic core post 12 and attached to the mounting slot 15 on the external magnetic core post 12; the method can be specifically set according to actual application requirements, and is beneficial to the expansion of design dimensions.

Specifically, in this embodiment, the ratio of the height of the center core leg 11 to the height of the outer core leg 12 is 1.5.

In the present embodiment, although the horizontal columns according to the first embodiment may be added to assist the positioning of the core fixing portion 1 and the core sealing portion 2, since the pillars may also function as close to each other, the design of the protruding horizontal columns is eliminated to reduce the complexity of the design of the processing parts, but the addition of the horizontal columns is still within the scope of the design.

Optionally, the cross-sectional shape of the positioning portion 13 may be, but is not limited to, a rectangular shape or a trapezoid shape, as shown in fig. 10, fig. 10 is a schematic partial cross-sectional structure diagram of another structure of the inductor of this embodiment, and the positioning portion 13 is entirely trapezoidal, so that the risk of installation and misalignment of the magnetic core packaging portion 2 and the magnetic core fixing portion 1 can be effectively reduced, further, the top of the positioning portion 13 is provided with a tooth portion 131 abutting against the conductive coil 3, and it is easy to understand that the tooth portion 131 can effectively enhance the bonding force between the conductive coil 3 and the magnetic core packaging portion 2 and the magnetic core fixing portion 1.

A second difference between the present embodiment and the first embodiment is that the height of the conductive coil 3 is greater than the height of the external magnetic core column 12, the height of the conductive coil 3 is less than the height of the central magnetic core column 11, the magnetic core packaging part 2 is further provided with a second receiving slot 23 for receiving the conductive coil 3, and the first receiving slot 22 is opened in the second receiving slot 23.

Specifically, the depth of the second receiving groove 23 is 0.95 times the difference between the height of the center core leg 11 and the height of the outer core leg 12, the height of the outer core leg 12 does not include the height of the positioning portion 13, and the ratio of the cross-sectional area of the second receiving groove 23 to the cross-sectional area of the center core leg 11 is 1.02 to 1.05.

Wherein, the ratio of the internal hollow sectional area of the wound conductive coil 3 to the sectional area of the central magnetic core column 11 is between 1.02 and 1.05, and the ratio of the end surface area occupied by the whole wound conductive coil 3 to the end surface area of the magnetic core gap 17 of the magnetic core fixing part 1 is between 0.95 and 0.98.

Example four

Referring to fig. 11 and 12, a fourth embodiment of the present invention is a further development on the basis of the first embodiment, and is different from the first embodiment in that: the conductive coil 3 is wound in a double-layer mode in the direction that the flat end face of the conductive coil is perpendicular to the central magnetic core column 11, two end portions of the conductive coil 3 are led out from the communicating groove 14 of the magnetic core fixing portion 1 respectively and are bent in an attaching mode along the extending direction of the mounting groove 15.

EXAMPLE five

Referring to fig. 13 and fig. 14, a fifth embodiment of the present invention is a further development on the basis of the first embodiment, and is different from the first embodiment in that: the magnetic core fixing part 1 is of a split structure, specifically, the magnetic core base and the external magnetic core column 12 are of an integrated structure, the central magnetic core column 11 is of an independent structure, and the center of the magnetic core base is provided with an insertion groove 18 for installing the central magnetic core column 11.

Specifically, the preparation method of the inductor in this embodiment is as follows: the method specifically comprises the following steps of,

s51, filling magnetic powder into a forming die, so that the magnetic core base and the outer magnetic core column 12 are integrally formed, and the central magnetic core column 11 is separately formed;

s52, winding the conductive coil 3, placing the conductive coil 3 in a surrounding structure surrounded by external magnetic core columns 12, leading two end parts of the conductive coil 3 out of a communication groove 14 in the external magnetic core columns 12 respectively, and bending along the extension direction of the communication groove 14 to form an electric connection part 31;

s53, inserting the central magnetic core column 11 into the inserting groove 18 of the magnetic core fixing part 1 through the conductive coil 3;

s53, compressing and molding the magnetic powder into a magnetic core packaging part 2, filling a small amount of viscous magnetic powder into a magnetic core gap 17 in advance, positioning and mounting the magnetic core packaging part 2 to the magnetic core fixing part 1, and performing a second compression procedure, wherein in the process, the central magnetic core part can generate transverse deformation, so that the central magnetic core column 11 and the conductive coil 3 are combined more tightly;

s54, after the electrical connection portion 31 of the conductive coil 3 is stripped, the conductive metal layer 16 is attached to the electrical connection portion 31 by electroplating or physical deposition.

The central core leg 11 may adopt magnetic powder with different composition or different process from the core package 2, the outer core leg 12 and the core base, for example, the central core leg 11 formed by molding magnetic metal powder or nanocrystalline powder under a predetermined pressure (high pressure) exhibits different characteristics from the outer core leg 12, thereby improving magnetic permeability and magnetic flux density.

In conclusion, the inductor provided by the utility model has the characteristics of accurate positioning, high structural strength, good magnetic performance and rich structural style.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.

Claims

1. An inductor, comprising

The magnetic core fixing part comprises a magnetic core base, a central magnetic core column and an external magnetic core column, the central magnetic core column is arranged in the center of the magnetic core base, the external magnetic core column surrounds the central magnetic core column and is arranged on the magnetic core base, a magnetic core gap is formed between the external magnetic core column and the central magnetic core column, and a positioning part is convexly arranged on the external magnetic core column;

the conductive coil is sleeved on the central magnetic core column and is positioned in the magnetic core gap;

the magnetic core packaging part is connected with the magnetic core fixing part, a first accommodating groove matched with the central magnetic core column in shape is formed in the magnetic core packaging part, and a positioning groove matched with the positioning part is further formed in the magnetic core packaging part.

2. The inductor according to claim 1, wherein an end of the conductive coil is an electrical connection exposed to an outer sidewall of the outer core leg.

3. The inductor as claimed in claim 2, wherein a mounting groove is formed on an outer side wall of the outer core leg, and the electrical connection portion is located in the mounting groove.

4. The inductor according to claim 3, further comprising a conductive metal layer filling the mounting groove, the conductive metal layer covering the electrical connection portion.

5. The inductor as claimed in claim 4, wherein the electrical connection portion is flat and fits snugly into the mounting groove.

6. The inductor as claimed in claim 1, wherein the cross-sectional shape of the central core leg is circular, elliptical, racetrack, or regular polygonal.

7. The inductor of claim 1, wherein a ratio of a height of the center core leg to a height of the outer core legs is greater than or equal to 1.05 and less than or equal to 1.5.

8. The inductor according to claim 1, wherein the height of the conductive coil is greater than the height of the outer core leg, the height of the conductive coil is less than the height of the center core leg, the core package further defines a second receiving slot for receiving the conductive coil, and the first receiving slot is disposed in the second receiving slot.

9. The inductor of claim 1, wherein the positioning portion comprises at least one inclined surface that interferes with the core encapsulation.

10. The inductor as claimed in claim 1, wherein the base has a slot, and the central core leg is inserted into the slot.