CN112185670A - Common mode inductor and preparation method thereof - Google Patents
Common mode inductor and preparation method thereof Download PDFInfo
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- CN112185670A CN112185670A CN202011027581.XA CN202011027581A CN112185670A CN 112185670 A CN112185670 A CN 112185670A CN 202011027581 A CN202011027581 A CN 202011027581A CN 112185670 A CN112185670 A CN 112185670A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/005—Impregnating or encapsulating
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Abstract
The embodiment of the invention discloses a common mode inductor and a preparation method thereof. The common mode inductor comprises an integrated magnetic core; the integrated magnetic core comprises a coil winding and an insulator, wherein the insulator wraps the coil winding; and the coil winding is connected with a wiring terminal, and the wiring terminal leaks the insulator to be used as a pin of the common mode inductor. The common mode inductance that this embodiment provided has integral type magnetic core structure, and coil winding and insulator obtain through integrated into one piece's mode promptly, therefore make coil winding can keep better structural compactness, and compare in the structure of current coil winding and the independent equipment of magnetic core, the coil winding that this embodiment provided can not take place the position change after integrated into one piece to guarantee common mode inductance's structural stability, improved common mode inductance's electrical parameter characteristic.
Description
Technical Field
The embodiment of the invention relates to a soft magnetic product manufacturing technology, in particular to a common mode inductor and a preparation method thereof.
Background
Various high-frequency circuits, digital circuits and analog circuits are mixed in the circuits inside the electronic products, and when the circuits work, a large amount of high-frequency electromagnetic waves are generated to interfere with each other, namely EMI. EMI can also be emitted outward through motherboard wiring or external cables, causing electromagnetic radiation pollution, not only affecting other electronic devices to cause work, but also harmful to the human body.
Common mode inductors, also called common mode chokes, are commonly used in switching power supplies of computers to filter common mode electromagnetic interference signals. In the board design, the common mode inductor also plays a role in EMI filtering, and is used for inhibiting electromagnetic waves generated by the high-speed signal line from radiating and emitting outwards.
In the related art, the double-winding inductor is obtained by independently assembling the magnetic core and the coil winding, and the problems that the winding coil structure is not compact and noise is easy to generate exist.
Disclosure of Invention
The embodiment of the invention provides a common mode inductor and a preparation method thereof, which are used for improving the performance of the common mode inductor.
In a first aspect, an embodiment of the present invention provides a common mode inductor, including an integrated magnetic core;
the integrated magnetic core comprises a coil winding and an insulator, wherein the insulator wraps the coil winding;
and the coil winding is connected with a wiring terminal, and the wiring terminal leaks the insulator to be used as a pin of the common mode inductor.
Optionally, the coil winding includes a first coil winding and a second coil winding, and the first coil winding and the second coil winding are not in contact.
Optionally, the first coil winding and the second coil winding are symmetrically disposed on two sides of a central axis plane of the insulator.
Optionally, the first coil winding and the second coil winding are both connected with two wiring terminals, an orthogonal projection of the two wiring terminals of the same coil winding on the bottom surface of the insulator has a preset included angle, and the bottom surface of the insulator is perpendicular to the coil winding.
Optionally, the integrated magnetic core further includes a positioning core body matched with the coil winding, the coil winding is sleeved on the positioning core body, and the positioning core body and the insulating coil are wrapped by the insulating powder.
In a second aspect, an embodiment of the present invention further provides a method for manufacturing a common mode inductor, where the method includes:
placing a coil winding connected with a wiring terminal into a preset area of a mold cavity, wherein the preset area is provided with a positioning device, and the positioning device is used for limiting the coil winding;
filling insulating powder into the mold cavity, wherein the coil winding is covered by the insulating powder;
pressing and molding the insulating powder and the coil winding to obtain an integrated magnetic core;
and curing the integrated magnetic core to obtain the common mode inductor.
Optionally, the positioning device includes a preset number of positioning columns;
the coil winding is connected with a positioning frame, the positioning frame is provided with a preset number of positioning holes, and the positioning holes are matched with the positioning columns to limit the coil winding.
Optionally, the coil winding is connected to the positioning frame through the wiring terminal, and the positioning hole is located on the outer side of the wiring terminal;
the coil winding comprises a first coil winding and a second coil winding, and the first coil winding and the second coil winding are not in contact in the preset area.
Optionally, the curing the integrated magnetic core includes:
and curing the integrated magnetic core for a preset time by using a curing device with a preset temperature.
Optionally, before the curing process is performed on the integrated magnetic core, the method further includes:
and separating the positioning frame from the wiring terminal.
Optionally, after the curing process is performed on the integrated magnetic core, the method further includes:
and bending and cutting the wiring terminal to form the pin of the common mode inductor.
Optionally, before the coil winding with the connected terminals is placed in the preset area of the mold cavity, the method further includes:
pre-forming a positioning core body, wherein the positioning core body is matched with the coil winding;
placing the positioning core in a preset area of a mold cavity;
correspondingly, the coil winding of the well-connected wiring terminal is placed in a preset area of a mold cavity, and the method comprises the following steps:
and sleeving the coil winding connected with the wiring terminal into the positioning core.
The common mode inductance that this embodiment provided has integral type magnetic core structure, and coil winding and insulator obtain through integrated into one piece's mode promptly, therefore make coil winding can keep better structural compactness, and compare in the structure of current coil winding and the independent equipment of magnetic core, the coil winding that this embodiment provided can not take place the position change after integrated into one piece to guarantee common mode inductance's structural stability, improved common mode inductance's electrical parameter characteristic.
Drawings
Fig. 1 is a schematic structural diagram of a common mode inductor according to an embodiment of the present invention;
FIG. 2 is a top view of the common mode inductor of FIG. 1;
fig. 3 is a schematic structural diagram of another common mode inductor according to an exemplary embodiment of the present invention;
fig. 4 is a schematic diagram of a connection between the connection terminal and the coil winding according to the embodiment of the present invention;
fig. 5 is another connection diagram of the connection terminal and the coil winding according to the embodiment of the invention;
fig. 6 is a schematic structural diagram of a mold according to an embodiment of the present invention;
fig. 7 is a flowchart of a method for manufacturing a common mode inductor according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the filter circuit of the common-mode inductor, two common-mode inductor coils are wound on the same iron core, and the number of turns and the phase are the same (the winding directions are opposite). Thus, when normal current in the circuit flows through the common-mode inductor, the current generates reverse magnetic fields in the inductance coils wound in the same phase to offset each other, and at the moment, the normal signal current is mainly influenced by the resistance of the coils (and a small amount of damping caused by leakage inductance); when a common mode current flows through the coil, due to the isotropy of the common mode current, an equidirectional magnetic field is generated in the coil to increase the inductive reactance of the coil, so that the coil presents high impedance and generates a strong damping effect, thereby attenuating the common mode current and achieving the purpose of filtering.
The common mode inductor has various structures at present, such as annular magnetic core double windings, the common mode inductor has large volume, inconvenient winding, untight winding structure and easy noise problem; the assembled patch inductor double-winding adopts double-wire parallel winding except that the structure is not compact, and the interlayer short circuit risk of the double coils is very high. In view of the defects in the prior art, the embodiments of the present invention provide a novel common mode inductor and a method for manufacturing the same, and the embodiments of the present invention are further described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a common mode inductor according to an embodiment of the present invention, where the common mode inductor is manufactured by an integral molding method. Referring to fig. 1, the common mode inductor includes an integrated magnetic core 10;
the one-piece magnetic core 10 includes a coil winding 110 and an insulator 120, the insulator 120 wrapping the coil winding 110;
the coil winding 110 is connected with a connection terminal 130, and the connection terminal 130 leaks out of the insulator 120 as a pin of the common mode inductor.
The integrated magnetic core 10 is different from the existing magnetic core and coil winding structure, and the integrated magnetic core 10 is prepared by integrally molding the coil winding 110 and the insulator 120. The integrated magnetic core 10 includes a coil winding 110 and an insulator 120, wherein the insulator 120 (corresponding to the blank area in fig. 1, the insulator 120 can be obtained by filling insulating powder for molding) completely wraps the coil winding 110, so that the coil winding 110 is fixed in position, and the structural tightness of the coil winding 110 is ensured.
The common mode inductor provided by the embodiment has an integrated magnetic core 10 structure, that is, the coil winding 110 and the insulator 120 are obtained by integral molding, so that the coil winding 110 can maintain better structural tightness, and compared with the existing structure in which the coil winding 110 and the magnetic core are independently assembled, the position of the coil winding 110 provided by the embodiment is not changed after the integral molding, thereby ensuring the structural stability of the common mode inductor and improving the electrical parameter characteristics of the common mode inductor.
In some embodiments, in order to improve the stability of the coil winding 110, the positioning magnetic core may be obtained by a pre-forming method, so as to define the position of the coil winding 110 by the positioning magnetic core. The thus integrated magnetic core 10 can also be realized by the following structure: the one-piece magnetic core 10 further includes a positioning core (not shown in fig. 1) matched to the coil winding 110, the coil winding 110 is sleeved on the positioning core, and the insulator 120 wraps the positioning core and the insulated coil.
Wherein, the location core obtains through the preforming, the shape and the structure of location core and coil winding 110's shape and structure phase-match, so that coil winding 110 winds behind the location core, coil winding 110 can not produce the displacement, it can be known, after coil winding 110 produced certain displacement, it can lead to the electrical parameter performance decline of the common mode inductance who obtains, therefore this embodiment is through preforming location core, the location core can form the position to coil winding 110 and prescribe a limit to, the stable in structure of coil winding 110 has been guaranteed, thereby make the integral type magnetic core 10 structure that obtains after the integrated into one piece can work according to the design characteristic, the electrical parameter performance of common mode inductance has been improved.
Optionally, fig. 2 is a top view of the common mode inductor in fig. 1, referring to fig. 2. The coil winding 110 includes a first coil winding 111 and a second coil winding 112, and the first coil winding 111 and the second coil winding 112 are not in contact.
Two lead terminals of the first coil winding 111 are connected to one connection terminal 130, and two lead terminals of the second coil winding 112 are connected to one connection terminal 130, so as to form a four-terminal structure of the common mode inductor.
By arranging the first coil winding 111 and the second coil winding 112 to be not in contact with each other, the first coil winding 111 and the second coil winding 112 are not overlapped with each other, so that the problem of interlayer short circuit between the two coil windings 110 does not exist, and the problem of interlayer short circuit between the two coil windings 110 in the prior art is solved.
It should be noted that the coil winding in the present embodiment may be wound in different shapes, such as a cylindrical shape, an elliptic cylindrical shape, and the like. Fig. 3 is a schematic structural diagram of another common mode inductor according to an exemplary embodiment of the present invention, and it can be seen from fig. 3 that the first coil winding 111 and the second coil winding 112 are wound to have an elliptical cylindrical shape, and the first coil winding 111 and the second coil winding 112 do not overlap, so as to avoid the problem of short circuit between layers of the coil windings.
Optionally, in some embodiments, the first coil winding 111 and the second coil winding 112 are symmetrically disposed on two sides of the central axial plane of the insulator 120.
The first coil winding 111 and the second coil winding 112 are symmetrically arranged, and the two coil windings 110 are symmetrically arranged on two sides of the middle axial plane of the insulator 120, so that the two coil windings 110 are not overlapped, the suppression effect of the coil windings 110 on common-mode noise can be exerted, and the common-mode inductor has better electrical parameter characteristics.
Optionally, on the basis of the above embodiment, the first coil winding 111 and the second coil winding 112 are both connected with two connection terminals 130, an orthogonal projection of the two connection terminals 130 of the same coil winding 110 on the bottom surface of the insulator 120 has a preset included angle, and the bottom surface of the insulator 120 is perpendicular to the coil winding 110.
Four lead terminals of the two coil windings 110 are respectively connected to a connection terminal 130, thereby forming four pins of the common mode inductor. The two connection terminals 130 of the same coil winding 110 have a predetermined angle therebetween. The preset included angle can be adjusted according to the structure of the circuit board to which the common mode inductor is applied. Exemplarily, fig. 4 is a schematic diagram of connection terminals and coil windings provided by an embodiment of the present invention, and as can be seen from fig. 4, two lead terminals 1111 and 1112 of the first coil winding 111 are respectively connected to the connection terminals on the corresponding sides, so that an included angle between the two connection terminals of the first coil winding 111 is 90 °. Fig. 5 is another connection diagram of the connection terminals and the coil windings, according to the embodiment of the present invention, in this connection relationship, an included angle between the two connection terminals of the first coil winding 111 is 180 °. Of course, the angle between two connection terminals of the same coil winding can be specifically set according to the matched circuit board, and the specific angle of the preset included angle is not limited in this embodiment.
Optionally, fig. 6 is a schematic structural diagram of a mold according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 6, the first coil winding 111 and the second coil winding 112 are placed in a predetermined area of the mold, and the first coil winding 111 and the second coil winding 112 do not contact in the predetermined area. The first coil winding 111 and the second coil winding 112 are both connected to the connection terminal 130 to form a pin of the common mode inductor. The common mode inductor is obtained by filling an insulating powder material into the area between the first coil winding 111 and the second coil winding 112 and the connection terminal 130 to form an insulator 120, and then performing a press molding and curing process.
In the common mode inductor provided by the present embodiment, the integrated magnetic core 10 is obtained by an integrated molding manner, and the insulator 120 in the integrated magnetic core 10 completely wraps the two coil windings 110, so that the two coil windings 110 can be fixed at a set position; through separately setting up two coil winding 110 for two coil winding 110 contactless have solved the condition that current twin coil winding structure has the coil short circuit between the layer, have improved common mode inductance's job stabilization nature and reliability.
The embodiment of the invention also provides a preparation method of the common-mode inductor. Fig. 7 is a flowchart of a method for manufacturing a common mode inductor according to an embodiment of the present invention. Referring to fig. 7, the preparation method includes the steps of:
and S710, placing the coil winding connected with the connecting terminal into a preset area of the mold cavity.
The preset area is provided with a positioning device, and the positioning device is used for limiting the coil winding to prevent the coil winding from generating displacement.
The connecting terminal can be connected with the coil winding in a welding mode. And the connected wiring terminal leads out the lead end of the coil winding to form a pin of the common mode inductor. Referring to fig. 4 or 5, the coil winding 111 and the coil winding 112 are limited in a predetermined area of the mold, and the lead terminals of the coil winding 111 and the lead terminals of the coil winding 112 are connected to the same side of the connection terminals, respectively.
Optionally, in some embodiments, the positioning device may be implemented by:
the positioning device comprises a preset number of positioning columns;
the coil winding is connected with a positioning frame, the positioning frame is provided with a preset number of positioning holes, and the positioning holes are matched with the positioning columns to limit the coil winding.
The positioning columns are arranged in the preset area and are located in the outer side area of the coil winding. The quantity of reference column can set up to a plurality ofly, and a plurality of reference columns can be laid according to certain shape to form better limiting displacement to coil winding. For example, the positioning posts may be circular around the coil winding, or the positioning posts may be disposed only at diagonal positions of the coil winding. Of course, the number and the specific arrangement position of the positioning columns can be flexibly adjusted according to the actual situation, and this embodiment does not limit this.
The coil winding is connected with the positioning frame, the positioning holes with the number being consistent with that of the positioning columns are arranged on the positioning frame, and each positioning hole corresponds to one positioning column, so that the coil winding is fixed at the set position of the preset area through the positioning holes, and therefore, in the forming process, even if the coil winding is extruded by the filled powder, the coil winding cannot generate displacement, and the yield of the prepared common-mode inductor is guaranteed.
Optionally, the coil winding is connected to the positioning frame through a connection terminal. For example, the connection terminal may be integrated with the positioning frame, and the connection terminal may be connected to the coil winding by welding or the like, thereby connecting the positioning frame to the coil winding.
As described in the above embodiments, the coil windings are double coil windings, and accordingly, it is necessary to separately position the two coil windings when molding. For example, the preset area comprises a first area and a second area, the two areas are provided with positioning columns, the positioning frame connected with the coil is provided with positioning holes on two sides, and after the positioning frame is connected with the coil, the positioning holes of the positioning frame are matched with the positioning columns on the corresponding sides to limit the coil windings on the corresponding sides, so that the double-coil windings can be molded at the specified positions, and a coil winding structure meeting the design requirements is formed.
S720, filling insulating powder into the cavity of the mold, wherein the insulating powder covers the coil winding.
Wherein the insulating powder is obtained by insulating powder prepared in advance. The powder material prepared in advance may be one or more metal mixed powder of carbonyl iron powder, iron silicon chromium powder, iron-based amorphous powder, and the like.
The insulation treatment can be achieved by, for example, disposing an insulation coating agent, and the insulation coating agent can be one or more of epoxy resin, silicone resin, phenol resin, potash water glass, and the like.
Referring to fig. 6, after filling the mold with the insulating powder, an insulator 120 is formed, and the insulator 120 completely covers the two coil windings.
And S730, pressing and forming the insulating powder and the coil winding to obtain the integrated magnetic core.
And applying certain pressure to the insulating powder and the coil winding to press and mold the insulating powder and the coil winding together to obtain the integrated magnetic core. In one embodiment, the forming pressure is 6-8T/cm2。
After the pressing treatment, the filled insulating powder is filled in the gap of the cavity of the die, so that a coil winding structure with a compact structure is formed.
And S740, curing the integrated magnetic core to obtain the common-mode inductor.
And after the integral magnetic core is cured, the shape of the integral magnetic core can not be changed, and a final common mode inductor product is obtained.
In one embodiment, the curing process comprises:
and curing the integrated magnetic core for a preset time by using a curing device with a preset temperature.
In a specific embodiment, the fixing device is an oven, that is, the curing treatment of the integrated magnetic core is completed by placing the integrated magnetic core into the oven and baking the integrated magnetic core for a preset time.
In one embodiment, the temperature of the oven is set to 70 ℃ to 160 ℃, the integrated magnetic core is baked for more than 6 hours, and the curing treatment of the integrated magnetic core is completed, so that the common mode inductor is obtained.
According to the preparation method of the common mode inductor, the positioning device is arranged at the preset position of the mold, and the positioning device is used for limiting the placed coil winding, so that the coil winding is prevented from changing position in the mold, and the problem that the coil winding is easy to change position under the action of the filled powder in the integral molding process is solved. The integrated magnetic core is prepared by using an integrated forming mode, so that the powder is fully contacted and coupled with the coil winding, the structural tightness of the coil winding is ensured, the noise of the common-mode inductor obtained after forming is reduced, and the electrical parameter performance of the common-mode inductor is improved.
Optionally, on the basis of the above technical solution, before the curing treatment is performed on the integrated magnetic core, the method for manufacturing a common mode inductor further includes:
and separating the positioning frame from the wiring terminal.
Wherein, the positioning frame can be separated in the process of pressing and molding the insulating powder and the coil winding; or after the press forming, the positioning frame is separated from the wiring terminal by applying an additional force to the positioning frame.
Optionally, on the basis of the above technical solution, after the curing treatment is performed on the integrated magnetic core, the method for manufacturing a common mode inductor further includes:
and bending and cutting the wiring terminal to form a pin of the common mode inductor.
The terminal can be bent and cut correspondingly according to the structure of the circuit board to which the common mode inductor is applied, so that the terminal forms a bent pin matched with the structure of the circuit board, and the bent pin is used as a pin of the common mode inductor.
Optionally, on the basis of the above technical scheme, before the coil winding connected with the connection terminal is placed in the preset area of the mold cavity, the method for manufacturing the common mode inductor further includes:
pre-forming a positioning core body, wherein the positioning core body is matched with the coil winding;
the positioning core is placed in a predetermined area of the mold cavity.
Accordingly, the step of placing the coil winding with the connected terminal in the preset area of the mold cavity may be specifically optimized as follows:
and sleeving the coil winding connected with the wiring terminal into the positioning core.
The coil winding is sleeved in the positioning core body just by preforming the positioning core body and setting the positioning core body to be matched with the coil winding in shape and size. And then the coil winding is sleeved into the positioning core body by placing the positioning core body at the preset position of the mold, so that the position of the positioning core body in the mold is fixed. Therefore, under the dual functions of the positioning core body and the positioning device, in the process of filling powder, the powder can not cause the position change of the coil winding under the extrusion effect on the coil winding, so that the coil winding can be ensured to be molded according to the design requirement, and the obtained working parameters of the common-mode inductor can meet the design requirement.
Optionally, on the basis of the above technical solution, after the curing treatment is performed on the integrated magnetic core, the method for manufacturing a common mode inductor further includes: and coating the cured integrated magnetic core.
After the coating is treated, the coating forms a protective layer of the integrated magnetic core, and the protective layer can prolong the service life of the common-mode inductor. For example, during the use process, the common mode inductor inevitably collides with other objects, and the coating layer can protect the integrated magnetic core from being collided, thereby being beneficial to improving the service life of the common mode inductor.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (12)
1. A common mode inductor is characterized by comprising an integrated magnetic core;
the integrated magnetic core comprises a coil winding and an insulator, wherein the insulator wraps the coil winding;
and the coil winding is connected with a wiring terminal, and the wiring terminal leaks the insulator to be used as a pin of the common mode inductor.
2. The common mode inductor of claim 1, wherein the coil windings comprise a first coil winding and a second coil winding, the first coil winding and the second coil winding being non-contacting.
3. The common mode inductor of claim 2, wherein the first coil winding and the second coil winding are symmetrically disposed on both sides of a central axial plane of the insulator.
4. A common-mode inductor according to claim 2 or 3, wherein two connection terminals are connected to the first coil winding and the second coil winding, an orthogonal projection of the two connection terminals of the same coil winding on the bottom surface of the insulator has a preset included angle, and the bottom surface of the insulator is perpendicular to the coil winding.
5. The common mode inductor according to claim 1, wherein the integrated magnetic core further comprises a positioning core matched with the coil winding, the coil winding is sleeved on the positioning core, and the insulating powder wraps the positioning core and the insulating coil.
6. A preparation method of a common mode inductor is characterized by comprising the following steps:
placing a coil winding connected with a wiring terminal into a preset area of a mold cavity, wherein the preset area is provided with a positioning device, and the positioning device is used for limiting the coil winding;
filling insulating powder into the mold cavity, wherein the coil winding is covered by the insulating powder;
pressing and molding the insulating powder and the coil winding to obtain an integrated magnetic core;
and curing the integrated magnetic core to obtain the common mode inductor.
7. A method for manufacturing a common-mode inductor according to claim 6, wherein the positioning device comprises a predetermined number of positioning posts;
the coil winding is connected with a positioning frame, the positioning frame is provided with a preset number of positioning holes, and the positioning holes are matched with the positioning columns to limit the coil winding.
8. The method for manufacturing the common-mode inductor according to claim 7, wherein the coil winding is connected to the positioning frame through the wiring terminal, and the positioning hole is located on the outer side of the wiring terminal;
the coil winding comprises a first coil winding and a second coil winding, and the first coil winding and the second coil winding are not in contact in the preset area.
9. The method according to claim 6, wherein the curing the integrated magnetic core comprises:
and curing the integrated magnetic core for a preset time by using a curing device with a preset temperature.
10. A method for preparing a common-mode inductor according to claim 7 or 8, wherein before the curing process of the integrated magnetic core, the method further comprises:
and separating the positioning frame from the wiring terminal.
11. The method according to claim 6, wherein after the curing process is performed on the one-piece magnetic core, the method further comprises:
and bending and cutting the wiring terminal to form the pin of the common mode inductor.
12. A method for manufacturing a common-mode inductor according to any one of claims 6 to 11, wherein before the coil winding of the connected terminals is placed in the predetermined area of the mold cavity, the method further comprises:
pre-forming a positioning core body, wherein the positioning core body is matched with the coil winding;
placing the positioning core in a preset area of a mold cavity;
correspondingly, the coil winding of the well-connected wiring terminal is placed in a preset area of a mold cavity, and the method comprises the following steps:
and sleeving the coil winding connected with the wiring terminal into the positioning core.
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| CN114628136A (en) * | 2022-03-22 | 2022-06-14 | 横店集团东磁股份有限公司 | Inductor forming die |
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