JP5310626B2 - Reactor and manufacturing method thereof - Google Patents

Description

  The present invention relates to a reactor used in a power converter and the like and a method for manufacturing the reactor.

Conventionally, a reactor used for a power converter such as an inverter for a vehicle is known (see Patent Document 1).
For example, as shown in FIG. 10, the reactor 91 is embedded in a core 93 made of a magnetic powder mixed resin in which magnetic powder such as iron powder is mixed and dispersed in an insulating resin such as an epoxy resin, and embedded in the core 93. It has a coil 92 that generates magnetic flux when energized, and a storage case 95 that stores the core 93 and the coil 92. Further, since the coil 92 and the core 93 covering the coil 92 generate heat by energization, the core body 941 is disposed in order to improve heat dissipation.

  In manufacturing such a reactor 91, the coil 92 and the core body 941 are disposed in the mold. Next, the magnetic powder mixed resin is filled in the mold and cured to form the core 93, and an integrated member in which the core 93, the coil 92, and the core core 941 are integrated is obtained. Then, after removing the integral member from the mold, it is stored in the storage case 95. Thereby, the reactor 91 is obtained.

JP 2008-198981 A

  However, as shown in FIG. 10, in the reactor 91 having the above structure, after aligning the integrated member such as the position of the terminal of the coil 92 in the storage case 95, the core body 941 of the integrated member is attached. The bottom case 951 of the storage case 95 is fastened and fixed using bolts 943. That is, another part for fixing the core body 941 to the storage case 95 is necessary, and there is a problem that the number of parts increases. Further, since the insertion hole 942 is formed in the center core body 941 and the bolt 943 is inserted therethrough, there is a problem that the shape of the center core body 941 is influenced by the diameter of the bolt 943.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a reactor capable of reducing the number of parts, reducing costs and improving productivity, and a method for manufacturing the same. .

The first invention comprises a core made of a magnetic powder mixed resin in which magnetic powder is mixed and dispersed in an insulating resin;
A cylindrical coil that is embedded in the core and generates magnetic flux when energized;
A columnar core disposed so as to penetrate the inside of the coil in the axial direction;
A bottomed cylindrical storage case for storing the core, the coil, and the core;
The core portion includes a core lower portion formed integrally with the bottom portion of the storage case, and a core body engaged and fixed to the core lower portion,
Intermediate core may have a engagement fixing portion which is engaged with and fixed to the engagement fixing portion provided on the lower wick above,
The side surface of the lower part of the core is in the reactor, which is in contact with the core (Claim 1).

According to a second aspect of the present invention, there is provided a core made of a magnetic powder mixed resin in which magnetic powder is mixed and dispersed in an insulating resin, a cylindrical coil embedded in the core and generating a magnetic flux when energized, A columnar core part disposed so as to penetrate the inner side in the axial direction, and a bottomed cylindrical storage case that stores the core, the coil, and the core part , the core part , A lower part of the core formed integrally with the bottom of the storage case, and a core body engaged with and fixed to the lower part of the core, the core body being engaged by the lower part of the core. the engagement fixing portion which is engaged with and fixed to the engagement fixing portion possess, the wick bottom sides a method of manufacturing a reactor in contact with the core,
A coil placement step of placing the coil in the storage case;
A core disposing step of engaging and fixing the engagement fixing portion of the core body to the engaged fixing portion of the storage case, and forming the core portion in the storage case;
A resin filling step of filling the magnetic powder mixed resin in the storage case storing the coil and the core;
And a resin curing step in which the magnetic powder mixed resin filled in the storage case is cured to form the core (Claim 5 ).

  In the reactor according to the first aspect of the present invention, at least a part of the core portion is formed of a core body engaged and fixed to the storage case, and the core body is engaged and fixed provided in the storage case. And an engagement fixing portion that is engaged and fixed to the portion. That is, the core body itself has a function for engaging and fixing with respect to the storage case. And the said core is directly fixed with respect to the said storage case by the fixing function which self has.

  Therefore, unlike the conventional case, a fixing component such as a bolt for fixing the core body to the storage case is not necessary. Thereby, the number of parts can be reduced, and the shape of the core body can be set without being affected by fixing parts such as bolts. Further, by reducing the number of parts, a simpler configuration can be achieved, and costs can be reduced and productivity can be improved.

  In the reactor manufacturing method of the second invention, the storage case is used as a molding die for molding the core. Therefore, before the core is formed (before the resin filling process and the resin curing process), the core body can be fixed to the storage case in advance to form the core section (inside Core placement step). Thereby, the shape of the said core part containing the said core body can be set freely.

  In addition, since the core body can be fixed to the storage case in advance, as described above, the function for engaging and fixing the core body itself to the storage case. And the core body can be directly fixed to the storage case by its fixing function. Therefore, unlike the prior art, it is not necessary to fix the core body to the storage case using a fixing component such as a bolt. Thereby, the number of parts can be reduced, and the shape of the core body can be set without being affected by fixing parts such as bolts. Further, by reducing the number of parts, a simpler configuration can be achieved, and costs can be reduced and productivity can be improved.

  Thus, according to the present invention, it is possible to provide a reactor that can reduce the number of parts, reduce costs, and improve productivity, and a method for manufacturing the same.

Explanatory drawing which shows the structure of the reactor in Example 1. FIG. Explanatory drawing which shows the coil arrangement | positioning process and center core arrangement | positioning process in Example 1. FIG. Explanatory drawing which shows the resin filling process in Example 1. FIG. Explanatory drawing which shows the structure of the reactor in a reference example . Explanatory drawing which shows the structure of the reactor in Example 2. FIG. Explanatory drawing which shows the coil arrangement | positioning process and cover part arrangement | positioning process in Example 2. FIG. Explanatory drawing which shows the center arrangement | positioning process in Example 2. FIG. Explanatory drawing which shows the resin filling process in Example 2. FIG. Explanatory drawing which shows the structure of the reactor in Example 3. FIG. Explanatory drawing which shows the structure of the reactor in the past.

  In the first and second inventions, the engagement fixing portion of the core body and the engaged fixing portion of the storage case are capable of engaging and fixing the core body to the storage case. Any fixing structure may be used.

For example, it is preferable that one of the engagement fixing portion of the core and the engagement fixing portion of the storage case is a screw portion, and the other is a screw hole portion into which the screw portion is screwed ( Claims 2 and 6 ).
In this case, by screwing the screw part into the screw hole part and fastening it, it is possible to fix both of them sufficiently and securely without forming a gap between the core and the storage case. it can.
In addition, since it is easier to manufacture the threaded portion on the core body than the threaded portion on the storage case, the engagement fixing portion of the core body is a threaded portion, The engaged portion is preferably a screw hole portion.

  In addition, as the fixing structure of the engagement fixing portion of the core body and the engaged fixing portion of the storage case, in addition to the above-described structure that is fixed by screw fastening, a structure that is fixed by elastic engagement is adopted. can do.

Further, the wick portion, the bottom portion of the storage case and are integrally formed with interliner lower, ing from the engaging fixed the wick body intermediate core lower.
Thereby , the said core can be easily engaged and fixed with respect to the said storage case.

  In addition, the said core part can also be comprised only with the said core body. In this case, the engaged fixing portion may be provided on the bottom portion of the storage case, and the core member constituting the core portion may be engaged and fixed.

Moreover, it is preferable that at least one end portion of both end portions of the core portion is formed with an enlarged diameter portion having an outer diameter larger than that of the central portion.
In this case, the heat generated in the coil and the core by energization is efficiently transmitted from the core portion to the storage case and the lid portion described later that covers the opening of the storage case, thereby further improving heat dissipation. Can be made. Moreover, by providing the said enlarged diameter part, the part which is hard to be utilized as a magnetic path among the said cores can be eliminated, and reduction of core material cost can be aimed at. Moreover, the effect that the said core is latched by the said enlarged diameter part is also acquired.

In particular, it is preferable that the enlarged-diameter portion is formed at an end portion on the side opposite to the bottom portion side of the case among both end portions of the core portion.
In the reactor and the manufacturing method thereof according to the present invention, before the core is formed, the core body can be engaged with and fixed to the storage case in advance to form the core portion. Therefore, the said core part of the shape which provided the said enlarged diameter part is easily realizable. That is, manufacturing can be facilitated by using the core and the storage case as separate members and making them both in a shape that can be punched.

In addition, the said enlarged diameter part can be formed in the one or both edge part of the said core part.
Moreover, the said enlarged diameter part can be formed in a taper shape, a curved-surface shape, etc., for example so that an outer diameter may become large gradually as it goes outside.

In the first invention, the opening of the storage case is provided with a plate-like lid that covers the opening and has an insertion hole through which the core is inserted. The upper end portion is provided with a large-diameter portion having an outer diameter larger than the inner diameter of the insertion hole of the lid portion, and the core body is inserted from above into the insertion hole of the lid portion, it is preferable that the fixed against the upper surface of the storage case and the lid portion by the large-diameter portion (claim 3).
In this case, the lid portion can be fixed by the large-diameter portion of the core body by engaging and fixing the core body to the storage case. Moreover, since the member for fixing the said cover part becomes unnecessary, the reduction of the number of parts can be aimed at further.

  Any configuration other than the above can be adopted as long as the core is engaged and fixed to the storage case and the lid can be fixed by the core.

The opening of the storage case is provided with a plate-like lid that covers the opening, and the lid is preferably formed integrally with the core. Item 4 ).
In this case, a member for fixing the lid portion is not necessary, so that the number of parts can be further reduced.

In the second aspect of the invention, after the coil placement step, a lid portion placement step of placing a plate-like lid portion having an insertion hole through which the core body is inserted into the opening of the storage case is performed. In the core placement step, the core body is inserted from above into the insertion hole of the lid portion, and the engagement fixing portion of the core body is engaged and fixed to the engaged fixing portion of the storage case. In addition, the lid portion may be fixed to the upper surface of the storage case by a large-diameter portion provided on the upper end portion of the core body and having an outer diameter larger than the inner diameter of the insertion hole of the lid portion. Preferred (Claim 7 ).
In this case, the lid portion can also be fixed by the large-diameter portion of the core member by engaging and fixing the core body to the storage case in the core arranging step. Thereby, since the member for fixing the said cover part becomes unnecessary, the reduction of the number of parts can be aimed at further.

In addition, a plate-like lid portion for covering the opening of the storage case is integrally formed on the core body, and the engagement fixing portion of the core body is formed in the core core arranging step. together with engagement secured to the engaged fixing portion of the housing case, it is preferable to cover the opening of the storage case by the cap portion (claim 8).
In this case, the lid portion can be disposed at the opening of the storage case by engaging and fixing the core body to the storage case in the center core disposing step. Thereby, the process of arrange | positioning the said cover part can be reduced. Moreover, since the member for fixing the said cover part becomes unnecessary, the reduction of the number of parts can be aimed at further.

The lid has a resin filling hole for filling the magnetic powder mixed resin into the storage case. In the resin filling step, the lid fills the storage case with the resin filling hole. it is preferable to fill the magnetic powder mixed resin (claim 9).
In this case, the magnetic powder mixed resin can be easily filled in the storage case even after the lid is disposed in the opening of the storage case.
The resin filling hole may be provided in the storage case itself that is filled with the magnetic powder mixed resin, for example.

Example 1
The reactor concerning the Example of this invention and its manufacturing method are demonstrated using figures.
As shown in FIG. 1, a reactor 1 of this example includes a core 3 made of a magnetic powder mixed resin in which magnetic powder is mixed and dispersed in an insulating resin, and a cylinder that is embedded in the core 3 and generates magnetic flux when energized. Coil 2, a columnar core 4 disposed so as to penetrate the inside of coil 2 in the axial direction, and a bottomed cylindrical storage case for storing core 3, coil 2, and core 4 And 5. A part of the middle core portion 4 is composed of a middle core body 41 engaged and fixed to the storage case 5. The core body 41 includes an engagement fixing portion 410 that is engaged and fixed to the engaged fixing portion 50 provided in the storage case 5.
This will be described in detail below.

As shown in the figure, the core 3 is disposed so as to cover the periphery of the coil 2. The core 3 is made of a magnetic powder mixed resin in which iron powder as a magnetic powder is mixed and dispersed in a thermosetting resin such as an epoxy resin as an insulating resin.
The coil 2 is embedded in the core 3. The coil 2 is formed in a cylindrical shape by winding a copper wire in a spiral shape.

  As shown in the figure, the core 4 is disposed so as to penetrate the inside of the coil 2 in the axial direction. The core part 4 includes a core lower part 42 formed integrally with a bottom part 51 of the storage case 5 described later, and a core body 41 engaged and fixed to the core lower part 42. Moreover, the core body 41 and the core lower part 42 are comprised with the aluminum material.

  As shown in the figure, the storage case 5 has a bottomed cylindrical shape having a bottom 51, a cylindrical side wall 52 erected from the outer periphery of the bottom 51, and an opening 53 that opens upward. Is formed. The bottom 51 of the storage case 5 is integrally formed with a core lower portion 42 of the core 4. The storage case 5 is made of an aluminum material.

As shown in the figure, the core body 41 of the core portion 4 is provided with a threaded portion (engagement fixing portion) 410 protruding in the axial direction from the lower end surface 414 thereof.
Further, a screw hole portion (engaged fixing portion) 50 formed in the axial direction from the upper end surface 423 is provided in the core lower portion 42 of the storage case 5.
Then, the screw portion 410 of the core body 41 is screwed (engaged) with the screw hole 50 of the core lower portion 42 of the storage case 5, and the core body 41 is fastened to the storage case 5 (core lower portion 42) ( Fixed).

  As shown in the figure, the upper end portion 401 and the lower end portion 402 (the upper end portion 411 of the center core body 41 and the lower end portion 422 of the center core lower portion 42) of the center core portion 4 have an enlarged diameter larger than that of the center portion 400. A diameter portion 404 is formed. In this example, the core part 4 has an outer diameter that gradually increases from the central part 400 toward the end part.

Next, the manufacturing method of the reactor 1 of this example is demonstrated.
In manufacturing the reactor 1 of this example, as shown in FIG. 2 and FIG. 3, the coil placement step of placing the coil 2 in the storage case 5, and the engagement fixing portion 410 of the core body 41 are connected to the storage case 5. A core arranging step for engaging and fixing the engaged fixed portion 50 to form the core portion 4 in the storage case 5, and the magnetic powder mixed resin 30 in the storage case 5 storing the coil 2 and the core portion 4. And a resin curing step in which the magnetic powder mixed resin 30 filled in the storage case 5 is cured to form the core 3.
This will be described in detail below.

First, as shown in FIG. 2, the coil 2 is arranged in the storage case 5 (coil arranging step). At this time, a spacer or the like is disposed between the bottom 51 of the storage case 5 and the coil 2, and the coil 2 is disposed at a predetermined position in the storage case 5.
Next, as shown in the figure, the screw portion (engagement fixing portion) 410 of the core body 41 is screwed into the screw hole portion (engagement fixing portion) 50 of the lower core portion 42 of the storage case 5. Thereby, the core 41 is fastened to the storage case 5 (the core lower part 42), and the core 4 comprising the core 41 and the core lower part 42 is formed in the storage case 5 (core arrangement step). ).

Next, as shown in FIG. 3, the coil 2 is arranged, the storage case 5 in which the core portion 4 is formed is filled with the liquid magnetic powder mixed resin 30, and the coil 2 is embedded in the magnetic powder mixed resin 30. (Resin filling step).
Next, the magnetic powder mixed resin 30 filled in the storage case 5 is heat treated to cure the magnetic powder mixed resin 30 and form the core 3 (resin curing step).
Thereby, the reactor 1 shown in FIG. 1 is obtained.

Next, the effect in the reactor 1 of this example and its manufacturing method is demonstrated.
In the reactor 1 of this example, a part of the core part 4 is composed of a core body 41 engaged and fixed to the storage case 5, and the core body 41 is an engaged fixed part provided in the storage case 5. 50 has an engagement fixing portion 410 engaged and fixed to 50. That is, the core body 41 itself has a function for engaging and fixing with respect to the storage case 5. And the core 41 itself is directly fixed with respect to the storage case 5 by the fixing function.

  Therefore, a fixing component such as a bolt for fixing the core body 41 to the storage case 5 is not required as in the prior art. As a result, the number of parts can be reduced, and the shape of the core 4 can be set without being affected by fixing parts such as bolts. Further, by reducing the number of parts, a simpler configuration can be achieved, and costs can be reduced and productivity can be improved.

  Further, in the manufacturing method of this example, the storage case 5 is used as a molding die for molding the core 3. Therefore, before the core 3 is formed (before the resin filling step and the resin curing step), the core body 41 can be fixed to the storage case 5 to form the core portion 4 (core core). Placement process). Thereby, the shape of the core part 4 including the core body 41 can be freely set.

  Moreover, in this example, the engagement fixing | fixed part 410 of the center core body 41 and the to-be-engaged fixing | fixed part 50 of the storage case 5 are a screw part and the screw hole part which screws the screw part, respectively. Therefore, the screw part 410 of the core body 41 is screwed into the screw hole part 50 of the storage case 5 and fastened to form a gap between the core body 41 and the storage case 5 (the core lower part 42). And can be fixed sufficiently and reliably.

  The core 4 includes a core lower part 42 formed integrally with the bottom 51 of the storage case 5 and a core body 41 engaged and fixed to the core lower part 42. Therefore, the core body 41 can be easily engaged and fixed to the storage case 5.

  Further, an enlarged diameter portion 404 having an outer diameter larger than that of the central portion 400 is formed at both end portions 401 and 402 of the core portion 4. Therefore, the heat generated in the coil 2 and the core 3 by energization can be efficiently transmitted from the core 4 to the storage case 5 and the heat dissipation can be further improved. Further, by providing the enlarged diameter portion 404, it is possible to eliminate a portion of the core 3 that is difficult to be used as a magnetic path, and to reduce the core material cost. Moreover, the effect that the core 3 is latched by the enlarged diameter part 404 is also acquired.

  In particular, in the reactor 1 and the manufacturing method thereof in this example, before the core 3 is formed, the core body 41 can be engaged with and fixed to the storage case 5 in advance to form the core section 4. . Therefore, the core part 4 having the shape provided with the enlarged diameter part 404 can be easily realized. That is, manufacturing can be facilitated by using the core body 41 and the storage case 5 as separate members and making them both in a shape that can be stamped.

  Thus, according to this example, the reactor 1 which can reduce a number of parts, can aim at cost reduction and productivity improvement, and its manufacturing method can be provided.

( Reference example )
In this example, as shown in FIG. 4, the configuration of the core part 4 is changed.
In this example, as shown in the figure, the core part 4 is composed of only the core body 41. That is, the core part 4 is comprised by the one part which integrally formed the core body 41 and the core lower part 42 which comprised the core part 4 in the reactor 1 (FIG. 1) of Example 1. FIG. .

As shown in the figure, the core body 41 is provided with a screw portion (engagement fixing portion) 410 protruding in the axial direction from the lower end surface 414 thereof. The bottom 51 of the storage case 5 is provided with a screw hole portion (an engaged fixed portion) 50 formed in the axial direction.
Then, the core body 41 is fastened to the storage case 5 by screwing the screw portion 410 of the core body 41 into the screw hole 50 of the bottom 51 of the storage case 5.
The other configuration is the same as that of the first embodiment, and has the same operation and effect.

(Example 2 )
In this example, as shown in FIG. 5, the configuration of the core body 41 is changed and the lid portion 6 is disposed in the opening 53 of the storage case 5.
In this example, as shown in the figure, the opening 53 of the storage case 5 is provided with a plate-like lid 6 that covers the opening 53. The lid 6 has an insertion hole 61 for inserting the core body 41 and a resin filling hole 62 for filling the magnetic powder mixed resin 30 into the storage case 5.

As shown in the figure, the upper end portion 411 of the core body 41 is provided with a large diameter portion 415 having an outer diameter larger than the inner diameter of the insertion hole 61 of the lid portion 6. The core body 41 is inserted from above into the insertion hole 61 of the lid portion 6, and the lid portion 6 is pressed and fixed to the upper surface 521 of the side wall portion 52 of the storage case 5 by the large diameter portion 415.
Other configurations are the same as those in the first embodiment.

Next, the manufacturing method of the reactor 1 of this example is demonstrated.
First, as shown in FIG. 6, the coil 2 is arranged in the storage case 5 (coil arranging step).
Next, as shown in the figure, the lid portion 6 is arranged so as to cover the opening 53 of the storage case 5 (lid portion arranging step).

Next, as shown in FIG. 7, the core body 41 is inserted into the insertion hole 61 of the lid portion 6 from above, and the screw portion (engagement fixing portion) 410 of the core core body 41 is inserted into the lower center portion of the storage case 5. 42 is screwed into the screw hole portion (engaged fixing portion) 50.
Thereby, as shown in FIG. 8, the core body 41 is fastened to the storage case 5 (the core lower portion 42), and the core portion 4 including the core body 41 and the core lower portion 42 is formed in the storage case 5. At the same time, the lid portion 6 is pressed against and fixed to the upper surface 521 of the side wall portion 52 of the storage case 5 by the large-diameter portion 415 of the core body 41 (center core placement step).

Next, as shown in the figure, the liquid magnetic powder mixed resin 30 is filled into the storage case 5 from the resin filling hole 62 of the lid 6 and the coil 2 is embedded in the magnetic powder mixed resin 30 (resin filling). Process).
Next, the magnetic powder mixed resin 30 filled in the storage case 5 is heat treated to cure the magnetic powder mixed resin 30 and form the core 3 (resin curing step).
Thereby, the reactor 1 shown in FIG. 5 is obtained.

In the case of this example, the lid 6 can be fixed by the large-diameter portion 415 of the core 41 by engaging and fixing the core 41 to the storage case 5. Moreover, since the member for fixing the cover part 6 becomes unnecessary, the number of parts can be further reduced.
Since the lid 6 has a resin filling hole 62 for filling the magnetic powder mixed resin 30 into the storage case 5, the lid 6 can be stored even after the lid 6 is disposed in the opening 53 of the storage case 5. The case 5 can be easily filled with the magnetic powder mixed resin 30.
The other functions and effects are the same as those of the first embodiment.

(Example 3 )
In this example, as shown in FIG. 9, the configuration of the lid 6 is changed.
In this example, as shown in the figure, the opening 53 of the storage case 5 is provided with a plate-like lid 6 that covers the opening 53. The lid 6 is formed integrally with the core body 41.
Other configurations are the same as those of the second embodiment.

Further, in the manufacturing method of the present example, the screw portion (engagement fixing portion) 410 of the core body 41 is replaced with the screw hole portion (engagement fixing portion) 50 of the lower core portion 42 of the storage case 5 in the core arrangement step. The core body 41 is fastened to the storage case 5 (the center core lower part 42) by being screwed onto the storage case 5, and the opening 53 of the storage case 5 is covered with the lid 6.
Others are the same manufacturing methods as in Example 2 .

In the case of this example, since the core body 41 and the lid portion 6 are integrally formed, a member for fixing the lid portion 6 becomes unnecessary, and therefore the number of parts can be further reduced. .
Further, the lid portion 6 can be disposed in the opening 53 of the storage case 5 by engaging and fixing the core body 41 to the storage case 5 in the center core arranging step. Therefore, it is not necessary to separately perform the step of arranging the lid portion 6.
The other functions and effects are the same as those of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Reactor 2 Coil 3 Core 4 Center part 41 Center body 410 Engagement fixing part 5 Storage case 50 Engagement fixing part

Claims (9)

A core made of magnetic powder mixed resin in which magnetic powder is mixed and dispersed in insulating resin;
A cylindrical coil that is embedded in the core and generates magnetic flux when energized;
A columnar core disposed so as to penetrate the inside of the coil in the axial direction;
A bottomed cylindrical storage case for storing the core, the coil, and the core;
The core portion includes a core lower portion formed integrally with the bottom portion of the storage case, and a core body engaged and fixed to the core lower portion,
Intermediate core may have a engagement fixing portion which is engaged with and fixed to the engagement fixing portion provided on the lower wick above,
A reactor , wherein a side surface of the lower part of the core is in contact with the core .   The reactor according to claim 1, wherein one of the engagement fixing portion of the core body and the engaged fixing portion of the storage case is a screw portion, and the other is a screw hole into which the screw portion is screwed. A reactor characterized by being a part. The reactor according to claim 1 or 2, wherein the opening of the storage case is provided with a plate-like lid portion that covers the opening and has an insertion hole through which the core is inserted. A large-diameter portion having an outer diameter larger than the inner diameter of the insertion hole of the lid portion is provided at the upper end portion of the core body, and the core body is located above the insertion hole of the lid portion. A reactor, wherein the lid portion is pressed against and fixed to the upper surface of the storage case by the large-diameter portion. 3. The reactor according to claim 1, wherein a plate-like lid that covers the opening is disposed in the opening of the storage case, and the lid is integrally formed with the core. A reactor characterized by being formed. A core made of a magnetic powder mixed resin in which magnetic powder is mixed and dispersed in an insulating resin, a cylindrical coil that is embedded in the core and generates magnetic flux when energized, and penetrates the inside of the coil in the axial direction And a bottomed cylindrical storage case that stores the core, the coil, and the core portion, and the core portion includes a bottom portion of the storage case. It consists of an integrally formed lower part of the core and a core body that is engaged and fixed to the lower part of the core, and the core is engaged with an engaged fixed portion provided at the lower part of the core. A method of manufacturing a reactor having an engagement fixing portion to be fixed, and a side surface of the lower portion of the core being in contact with the core,
A coil placement step of placing the coil in the storage case;
A core disposing step of engaging and fixing the engagement fixing portion of the core body to the engaged fixing portion of the storage case, and forming the core portion in the storage case;
A resin filling step of filling the magnetic powder mixed resin in the storage case storing the coil and the core;
And a resin curing step of curing the magnetic powder mixed resin filled in the storage case to form the core. 6. The method of manufacturing a reactor according to claim 5, wherein one of the engagement fixing portion of the core body and the engaged fixing portion of the storage case is a screw portion, and the other is screwing the screw portion. A method for manufacturing a reactor, wherein the reactor is a screw hole. The method for manufacturing a reactor according to claim 5 or 6, wherein after the coil placement step, a lid portion that places a plate-like lid portion having an insertion hole through which the core body is inserted in the opening portion of the storage case. An arrangement step is performed, and in the intermediate core arrangement step, the intermediate core body is inserted from above into the insertion hole of the lid portion, and the engagement fixing portion of the intermediate core body is inserted into the engaged case of the storage case. The lid is fixed to the upper surface of the storage case by a large-diameter portion having an outer diameter larger than the inner diameter of the insertion hole of the lid provided at the upper end of the core body. A method of manufacturing a reactor, wherein the reactor is pressed and fixed. In the reactor manufacturing method according to claim 5 or 6, a plate-like lid portion for covering the opening of the storage case is integrally formed on the core body, and the core core arranging step. Then, the engagement fixing portion of the core body is engaged and fixed to the engaged fixing portion of the storage case, and the opening portion of the storage case is covered by the lid portion. Production method. 9. The reactor manufacturing method according to claim 7, wherein the lid portion has a resin filling hole for filling the magnetic powder mixed resin into the storage case, and in the resin filling step, the lid includes the lid. A reactor manufacturing method, wherein the magnetic powder mixed resin is filled into the storage case from the resin filling hole of a portion.

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