WO2023218511A1

WO2023218511A1 - Noise countermeasure member and method for manufacturing same

Info

Publication number: WO2023218511A1
Application number: PCT/JP2022/019737
Authority: WO
Inventors: 哲也矢田; 正義安田; 仁史古賀
Original assignee: 北川工業株式会社
Priority date: 2022-05-09
Filing date: 2022-05-09
Publication date: 2023-11-16

Abstract

Provided are a noise countermeasure member that is attachable to a thin apparatus or to a narrow location where attachment is conventionally difficult, and a method for manufacturing said noise countermeasure member. This noise countermeasure member comprises a magnetic body core and a mold member. The magnetic body core is configured by a sintered compact of a magnetic material and has a shape in which a conductor can be arranged at a position that passes through an inner circumferential side. The mold member is formed with a resin material and is configured so as to mold the magnetic body core. The magnetic body core has a thin part with a thickness corresponding to the dimension between the inner circumferential side and the outer circumferential side of 1.5 mm to 4.0 mm. The mold member is an integrated molding article in which a portion that molds the inner circumferential side of the thin part and a portion that molds the outer circumferential side of the thin part are integrally molded by the resin material.

Description

Noise countermeasure member and its manufacturing method

The present disclosure relates to a noise countermeasure member and a method for manufacturing the same.

In a noise countermeasure member including a magnetic core, a technique is known in which the magnetic core is molded using a resin mold member (see, for example, Patent Document 1). In such a noise countermeasure member, a ferrite sintered body may be used as the magnetic core.

JP 2020-005043 Publication

When molding a ferrite sintered body with resin as described above, the wall thickness corresponding to the dimension between the inner circumferential side and the outer circumferential side of the magnetic core is generally approximately 5 mm or more. However, if such a ferrite sintered body is used and resin molds are added to the inner and outer circumferential sides of the magnetic core, the overall noise countermeasure member will have a correspondingly bulky structure. Therefore, it is sometimes difficult to install such noise countermeasure members in thin devices or in narrow spaces.

In one aspect of the present disclosure, it is desirable to provide a noise countermeasure member that can be attached to thin devices and narrow spaces, which have been difficult to attach with conventional products, and a method for manufacturing the same.

A noise countermeasure member according to one aspect of the present disclosure includes a magnetic core and a mold member. The magnetic core is made of a sintered body of a magnetic material, and has a shape that allows a conductor to be placed at a position penetrating the inner circumferential side. The mold member is formed of a resin material and configured to mold the magnetic core. The magnetic core has a thin portion having a wall thickness of 1.5 mm to 4.0 mm, which corresponds to the dimension between the inner circumferential side and the outer circumferential side. The mold member is an integrally molded product in which a part for molding the inner peripheral side of the thin-walled part and a part for molding the outer peripheral side of the thin-walled part are integrally molded from a resin material.

The noise countermeasure member configured in this manner has a thin portion having a wall thickness of 1.5 mm to 4.0 mm, which corresponds to the dimension between the inner circumferential side and the outer circumferential side of the magnetic core. Therefore, the noise countermeasure member can be made thinner than conventional products, which generally have a wall thickness of about 5 mm or more. Therefore, with such a noise countermeasure member, it is possible to attach the noise countermeasure member to thin devices and narrow spaces where it was difficult to attach conventional products.

Further, a method for manufacturing a noise countermeasure member according to one aspect of the present disclosure is a method for manufacturing a noise countermeasure member as described above. That is, the noise countermeasure member includes a magnetic core and a molded member, where the magnetic core is made of a sintered body of a magnetic material and has a shape that allows a conductor to be placed at a position penetrating the inner circumference. The mold member is formed of a resin material and is configured to mold a magnetic core, and the magnetic core has a wall thickness of 1.5 mm to 4 mm, which corresponds to the dimension between the inner circumferential side and the outer circumferential side. The mold member has a thin wall portion with a thickness of .0 mm, and the mold member is an integrally molded product in which a portion that molds the inner peripheral side of the thin wall portion and a portion that molds the outer peripheral side of the thin wall portion are integrally molded from a resin material. This is a method for manufacturing a noise countermeasure member. In this manufacturing method, when molding the mold member, before injecting the resin material into the mold, a holding pin is brought into contact with the magnetic core placed in the mold, and the magnetic core is placed in the mold. hold within. When injecting the resin material into the mold, at least the holding pin located at a position in contact with the thin-walled portion is retracted to a position away from the thin-walled portion at a predetermined timing.

According to the noise countermeasure member configured in this way, it is possible to manufacture the noise countermeasure member as described above. In particular, in this manufacturing method, at a predetermined timing when the resin material is injected into the mold, at least the holding pin located at a position in contact with the thin-walled portion is retracted to a position away from the thin-walled portion. Therefore, compared to the case where filling with the resin material is completed without retracting the holding pin, it is possible to suppress the generation of cracks in the magnetic core in the thin wall portion.

Note that the noise countermeasure member of the present disclosure may further include the following configurations.

(A1) The conductor may be arranged at a position penetrating the inner peripheral side of the magnetic core. The mold member may be configured to mold a part of the conductor together with the magnetic core.

Further, the method for manufacturing a noise countermeasure member of the present disclosure may further include the following configuration.

(B1) At least the holding pin located at a position in contact with the thin-walled portion may be retracted to a position away from the thin-walled portion as the resin material is filled into the mold.

FIG. 1A is a perspective view of the noise countermeasure member of the first embodiment viewed from the upper right front. FIG. 1B is a perspective view of the noise countermeasure member of the first embodiment viewed from the upper left rear. FIG. 1C is a perspective view showing the internal structure of the noise countermeasure member of the first embodiment. FIG. 1D is a perspective view showing how the noise countermeasure member of the first embodiment is used. FIG. 2A is a plan view of the noise countermeasure member of the first embodiment. FIG. 2B is a left side view of the noise countermeasure member of the first embodiment. FIG. 2C is a front view of the noise countermeasure member of the first embodiment. FIG. 2D is a right side view of the noise countermeasure member of the first embodiment. FIG. 2E is a bottom view of the noise countermeasure member of the first embodiment. FIG. 3A is a perspective view of the noise countermeasure member of the second embodiment viewed from the upper right front. FIG. 3B is a perspective view of the noise countermeasure member of the second embodiment viewed from the upper right rear side. FIG. 3C is a perspective view showing the internal structure of the noise countermeasure member of the second embodiment. FIG. 3D is a perspective view showing a part of the internal structure of the noise countermeasure member of the second embodiment. FIG. 4A is a plan view of the noise countermeasure member of the second embodiment. FIG. 4B is a front view of the noise countermeasure member of the second embodiment. FIG. 4C is a right side view of the noise countermeasure member of the second embodiment. FIG. 4D is a rear view of the noise countermeasure member of the second embodiment. FIG. 4E is a bottom view of the noise countermeasure member of the second embodiment. FIG. 5A is a perspective view of the noise countermeasure member of the third embodiment viewed from the upper right front. FIG. 5B is a perspective view showing the internal structure of the noise countermeasure member of the third embodiment. FIG. 5C is a perspective view showing a part of the internal structure of the noise countermeasure member according to the third embodiment. FIG. 5D is a perspective view showing another part of the internal structure of the noise countermeasure member according to the third embodiment. FIG. 6A is a plan view of the noise countermeasure member of the third embodiment. FIG. 6B is a left side view of the noise countermeasure member of the third embodiment. FIG. 6C is a front view of the noise countermeasure member of the third embodiment. FIG. 6D is a right side view of the noise countermeasure member of the third embodiment. FIG. 6E is a rear view of the noise countermeasure member of the third embodiment. FIG. 6F is a bottom view of the noise countermeasure member of the third embodiment.

1, 31, 61... Noise countermeasure member, 3, 33, 63... Magnetic core, 3A, 33A, 63A... Thin wall portion, 5, 35... Collar, 7, 37, 67... Mold member, 9, 39, 69... Conductor, 11... Through hole, 43... Projection, 631... U-shaped core, 632... I-shaped core, 65... Threaded portion.

Next, the above-mentioned noise countermeasure member and its manufacturing method will be described by citing exemplary embodiments.

(1) First Embodiment The first embodiment will be described below. As shown in FIGS. 1A, 1B, and 1C, the noise countermeasure member 1 includes a magnetic core 3, a collar 5, and a mold member 7. In the following description, in order to briefly explain the relative positions and orientations of the respective parts included in the noise countermeasure member 1, the description will be made using the front, back, left, right, top, and bottom directions that are also shown in the drawings. Each of these directions is the direction in which the part that appears in the front view of the noise countermeasure member 1 (see FIG. 2C) is directed, the direction in which the part that appears in the rear view (not shown) is directed, and the left side view ( The direction in which the part appearing in the right side view (see Fig. 2D) is directed is to the left, the direction in which the part appearing in the right side view (see Fig. 2D) is directed is to the right, and the direction in which the part appearing in the top view (see Fig. 2A) is directed is to the left. The direction in which the parts appearing in the top and bottom views (see FIG. 2E) are directed is defined as "down".

The magnetic core 3 is made of a sintered body of magnetic material (in this embodiment, a sintered body of ferrite). The magnetic core 3 has a shape that allows a conductor 9 (for example, a flat cable shown in FIG. 1D) to be placed at a position penetrating the inner circumferential side. In the case of this embodiment, the magnetic core 3 is formed into a flat cylindrical shape whose cross section perpendicular to the axial direction is an oval shape, and the axial direction thereof is oriented in the front-rear direction in the drawing. Therefore, the conductor 9 extending in the front-rear direction in the figure can be placed at a position penetrating the inner circumferential side.

The magnetic core 3 has a thin wall portion 3A having a wall thickness of 1.5 mm to 4.0 mm, which corresponds to the dimension between the inner circumferential side and the outer circumferential side of the magnetic core 3. In the case of this embodiment, the magnetic core 3 has a wall thickness of 4.0 mm over the entire circumference. That is, in the case of the embodiment, the entire magnetic core 3 is the thin portion 3A.

The collar 5 is made of a metal material (for example, stainless steel). The collar 5 is a cylindrical member, and for example, when the noise countermeasure member 1 is fixed at a predetermined mounting position with a bolt, the shaft of the bolt is passed through the inner circumferential side of the collar 5.

The mold member 7 is formed of a resin material (for example, polyamide) and is configured to mold the magnetic core 3 and collar 5. The mold member 7 is an integrally molded product in which a portion that molds the inner peripheral side of the thin wall portion 3A and a portion that molds the outer peripheral side of the thin wall portion 3A are integrally molded from a resin material. The mold member 7 is formed with a through hole 11 (see FIG. 2C) that penetrates in the front-rear direction. By passing the above-described conductor 9 through this through hole 11, the conductor 9 is arranged at a position where it passes through the inner peripheral side of the magnetic core 3.

Furthermore, as shown in FIGS. 2A, 2B, 2D, and 2E, the mold member 7 also includes a left positioning recess 21, a right positioning hole 22, a first lower positioning recess 23, a second lower positioning recess 24, A first rear positioning recess 25, a second rear positioning recess 26, etc. are formed. The left positioning recess 21, the right positioning hole 22, the first lower positioning recess 23, the second lower positioning recess 24, the first rear positioning recess 25, and the second rear positioning recess 26 are molded with a mold (not shown). This is the location where a holding part (not shown) that holds the magnetic core 3 in a predetermined position in the mold was in contact with the magnetic core 3 when molding the magnetic core 7 .

The holding portion that contacts the magnetic core 3 in the left positioning recess 21 and the right positioning hole 22 positions the magnetic core 3 in the left-right direction. The holding portions that contact the magnetic core 3 in the first rear positioning recess 25 and the second rear positioning recess 26 position the magnetic core 3 in the front-rear direction. In this embodiment, the flow path of the resin material within the mold is configured to go from the front of the magnetic core 3 to the rear. Therefore, the magnetic core 3 is pushed backward by the resin material, and if the holding portion contacts the magnetic core 3 in the first rear positioning recess 25 and the second rear positioning recess 26, the magnetic core 3 The position in the front-back direction can be determined.

The holding portions that contact the magnetic core 3 in the first lower positioning recess 23 and the second lower positioning recess 24 work together with a holding pin (not shown) that contacts the upper surface side of the magnetic core 3. 3. Position the position in the vertical direction. The holding pin that contacts the upper surface side of the magnetic core 3 is configured to be able to advance and retreat in the vertical direction within the mold at the locations indicated by broken lines in FIGS. 1A, 1B, and 2A. Therefore, when the holding pin contacts the thin wall portion 3A, the holding pin contacts a surface perpendicular to the thickness direction of the thin wall portion 3A, which is on the outer peripheral side of the thin wall portion 3A. When molding the mold member 7, before injecting the resin material into the mold, the holding pin is moved downward and brought into contact with the magnetic core 3 disposed within the mold. Thereby, the magnetic core 3 is held in the mold with its vertical position determined.

When injecting the resin material into the mold, after starting the injection of the resin material, the holding pin is moved upward at a predetermined timing and retracted to a position away from the thin section 3A. The specific means for retracting the holding pin is arbitrary; for example, the holding pin may be actively operated by transmitting power from a power source such as a cylinder, or the holding pin may be moved by the resin material filled in the mold. The retaining pin may be configured to operate passively in response to pressure from. By retracting the holding pin in this manner, it is possible to reduce the possibility that cracks will occur in the thin wall portion 3A of the magnetic core 3.

The fact that such an effect can be obtained is a fact that the inventors discovered through repeated trial production, and at this point, the mechanism has not been clearly elucidated. However, it is speculated that cracks occurring in the thin wall portion 3A of the magnetic core 3 can be suppressed for the following reasons.

That is, when the thin wall portion 3A is held by the non-retractable holding portion at the position corresponding to the holding pin as described above, the resin material is injected and the resin is filled into the inner and outer circumferential sides of the thin wall portion 3A. At this time, a "contact point with the holding pin" and a "contact point with the resin" are generated on the outer peripheral side of the thin wall portion 3A. On the other hand, only contact points with the resin occur on the inner peripheral side of the thin wall portion 3A. Therefore, a pressure difference occurs between the outer circumferential side and the inner circumferential side of the thin wall portion 3A depending on whether or not there is contact with the holding pin, and due to this pressure difference, bending stress is generated in the thin wall portion 3A. Cracks may occur.

On the other hand, if the above-mentioned holding pin is retracted in the direction away from the thin-walled portion 3A, when the resin material is injected and the inner and outer circumferential sides of the thin-walled portion 3A are filled with resin, the thin-walled portion Only "points of contact with the resin" occur on both the outer circumferential side and the inner circumferential side of 3A. Therefore, there is no pressure difference between the outer circumferential side and the inner circumferential side of the thin wall portion 3A, depending on whether or not they are in contact with the holding pin, and no bending stress is generated in the thin wall portion 3A, or at least the bending stress is weakened. As a result, cracks occurring in the thin wall portion 3A may be suppressed.

In other words, by retracting the holding pin and filling the outer and inner circumferential sides of the thin portion 3A with the resin material, it seems possible to suppress the occurrence of cracks in the thin portion 3A. As a result, even if the magnetic core 3 has an extremely thin shape, such as the thickness of the thin portion 3A of 0.15 mm to 0.4 mm, the occurrence of cracks can be suppressed. Therefore, the noise countermeasure effect of the noise countermeasure member 1 can be fully exhibited. Further, if the occurrence of cracks as described above can be suppressed, the production of defective products can be suppressed, and therefore the productivity of the noise countermeasure member 1 can be improved.

According to the noise countermeasure member 1 configured as described above, the thin wall portion 3A has a wall thickness of 1.5 mm to 4.0 mm, which corresponds to the dimension between the inner circumferential side and the outer circumferential side of the magnetic core 3. has. Therefore, the noise countermeasure member 1 can be made thinner than conventional products, which generally have a wall thickness of approximately 5 mm or more. Therefore, with such a noise countermeasure member 1, it is possible to attach the noise countermeasure member 1 even to thin devices and narrow spaces where it was difficult to attach conventional products.

In addition, in the above-described manufacturing method, when injecting the resin material into the mold, after the injection of the resin material has started, at least the holding pin located at a position in contact with the thin-walled portion 3A is moved to a position away from the thin-walled portion 3A. evacuate to. Therefore, compared to the case where filling with the resin material is completed without retracting the holding pin, it is possible to suppress the generation of cracks in the magnetic core 3 in the thin wall portion 3A.

(2) Second Embodiment Next, a second embodiment will be described. Note that the second embodiment only changes a part of the configuration illustrated in the first embodiment, so the details will be mainly focused on the differences from the first embodiment, and the same parts as the first embodiment will be described in detail. , a detailed explanation thereof will be omitted.

As shown in FIGS. 3A, 3B, 3C, and 3D, the noise countermeasure member 31 includes a magnetic core 33, a collar 35, a mold member 37, and a conductor 39. In the noise countermeasure member 31 of the second embodiment, in addition to the magnetic core 33 and the collar 35, a conductor 39 is molded with a mold member 37. The conductor 39 is a plate-shaped conductor (bus bar) made of copper alloy. A protrusion 43 is provided near the center of the conductor 39 in the longitudinal direction (front-to-back direction in the figure) and protrudes in the width direction of the conductor 39 (left-right direction in the figure). This protrusion 43 suppresses the conductor 39 from being displaced in the front-rear direction relative to the mold member 37.

The magnetic core 33, collar 35, and mold member 37 are different from the first embodiment in their detailed shapes and dimensions, but their constituent materials are the same as in the first embodiment, and their functions are also the same as in the first embodiment. It is similar to In particular, the magnetic core 33 has a thin portion 33A having a wall thickness of 1.5 mm to 4.0 mm over the entire circumference, and this point is also similar to the first embodiment.

As shown in FIGS. 4C, 4D, and 4E, the mold member 37 includes a left positioning recess 51, a right positioning recess 52, a first lower positioning recess 53, a second lower positioning recess 54, and a third lower positioning recess 55. , a fourth lower positioning recess 56, a first rear positioning recess 57, a second rear positioning recess 58, etc. are formed. Left positioning recess 51, right positioning recess 52, first lower positioning recess 53, second lower positioning recess 54, third lower positioning recess 55, fourth lower positioning recess 56, first rear positioning recess 57, and second rear positioning recess 58, when molding the mold member 37 with a mold (not shown), a holding part (not shown) that holds the magnetic core 33 in a predetermined position within the mold is a magnetic core. This is the part that was in contact with 33.

The holding parts that contact the magnetic core 33 in the first lower positioning recess 53 , the second lower positioning recess 54 , the third lower positioning recess 55 and the fourth lower positioning recess 56 are the holders that contact the upper surface side of the magnetic core 33 . In cooperation with a pin (not shown), the vertical position of the magnetic core 33 is determined. The holding pin that contacts the upper surface side of the magnetic core 33 is configured to be able to advance and retreat in the vertical direction within the mold at locations indicated by broken lines in FIGS. 3A, 3B, and 4A.

By adopting such a configuration, the mold member 37 can be molded in the same process as in the first embodiment. Furthermore, by retracting the holding pin at a predetermined timing, even if the magnetic core 33 has an extremely thin shape, such as the thickness of the thin wall portion 33A of 0.15 mm to 0.4 mm, the occurrence of cracks can be suppressed. I can do it. Therefore, the noise countermeasure effect of the noise countermeasure member 31 can be fully exhibited. Further, if the occurrence of cracks as described above can be suppressed, the production of defective products can be suppressed, so that the productivity of the noise countermeasure member 31 can be improved.

According to the noise countermeasure member 31 configured as described above, the thin wall portion 33A has a wall thickness of 1.5 mm to 4.0 mm, which corresponds to the dimension between the inner circumferential side and the outer circumferential side of the magnetic core 33. has. Therefore, the noise countermeasure member 31 can be made thinner than conventional products, which generally have a wall thickness of about 5 mm or more. Therefore, with such a noise countermeasure member 31, it is possible to attach the noise countermeasure member 31 even to a thin device or a narrow place where it was difficult to attach the conventional product.

Furthermore, in the above-described manufacturing method, after injection of the resin material is started, at least the holding pin located at a position where it contacts the thin wall portion 33A is retracted to a position away from the thin wall portion 33A at a predetermined timing. Therefore, compared to the case where filling with the resin material is completed without retracting the holding pin, it is possible to suppress the generation of cracks in the magnetic core 33 in the thin wall portion 33A.

Note that in the second embodiment, the left side view of the noise countermeasure member 31 appears the same as the right side view (see FIG. 4C).

(3) Third Embodiment Next, a third embodiment will be described. Note that the third embodiment will also be described in detail, focusing on the differences from the first embodiment, and detailed descriptions of the same parts as the first embodiment will be omitted.

As shown in FIGS. 5A, 5B, 5C, and 5D, the noise countermeasure member 61 includes a magnetic core 63, a threaded portion 65, a mold member 67, and a conductor 69. In the noise countermeasure member 61 of the third embodiment, in addition to the magnetic core 63 and the threaded portion 65, a conductor 69 is molded with a mold member 67. The conductor 69 is a plate-shaped conductor (bus bar) made of copper alloy.

The magnetic core 63 is a split core, unlike the first embodiment. Specifically, by combining a U-shaped core 631 having a U-shaped cross-sectional shape perpendicular to the axial direction and an I-shaped core 632 having an I-shaped cross-sectional shape perpendicular to the axial direction. , is configured to have a cylindrical shape as a whole. However, the magnetic core 63 also has a thin portion 63A having a thickness of 1.5 mm to 4.0 mm over the entire circumference.

As shown in FIGS. 6B, 6C, and 6F, the mold member 67 has a first left positioning recess 81, a second left positioning recess 82, a first lower positioning recess 83, a second lower positioning recess 84, and a third lower positioning recess 84. A lower positioning recess 85, a fourth lower positioning recess 86, a first front positioning recess 87, a second front positioning recess 88, etc. are formed. First left positioning recess 81 , second left positioning recess 82 , first lower positioning recess 83 , second lower positioning recess 84 , third lower positioning recess 85 , fourth lower positioning recess 86 , first front positioning recess 87 , and The second front positioning recess 88 is a holding part (not shown) that holds the magnetic core 63 in a predetermined position within the mold when molding the mold member 67 with a mold (not shown). is the part that was in contact with the magnetic core 63.

The holding parts that contact the magnetic core 63 in the first lower positioning recess 83 , the second lower positioning recess 84 , the third lower positioning recess 85 and the fourth lower positioning recess 86 are the holders that contact the upper surface side of the magnetic core 63 . The vertical position of the magnetic core 63 is determined in cooperation with a pin (not shown). The holding pin that contacts the upper surface side of the magnetic core 63 is configured to be able to advance and retreat in the vertical direction within the mold at the locations indicated by broken lines in FIGS. 5A and 6A.

By adopting such a configuration, the mold member 67 can be molded in the same process as in the first embodiment. Furthermore, by retracting the holding pin at a predetermined timing, it is possible to suppress the occurrence of cracks even if the magnetic core 63 has an extremely thin shape, such as the thickness of the thin wall portion 63A of 0.15 mm to 0.4 mm. Can be done. Therefore, the noise countermeasure effect of the noise countermeasure member 61 can be fully exhibited. Further, if the occurrence of cracks as described above can be suppressed, the production of defective products can be suppressed, and therefore the productivity of the noise countermeasure member 61 can be improved.

According to the noise countermeasure member 61 configured as described above, the thin wall portion 63A has a wall thickness of 1.5 mm to 4.0 mm, which corresponds to the dimension between the inner circumferential side and the outer circumferential side of the magnetic core 63. has. Therefore, the noise countermeasure member 61 can be made thinner than conventional products, which generally have a wall thickness of about 5 mm or more. Therefore, with such a noise countermeasure member 61, it is possible to attach the noise countermeasure member 61 even to a thin device or a narrow place where it was difficult to attach the conventional product.

Furthermore, in the above-described manufacturing method, at a predetermined timing, at least the holding pin located at a position where it contacts the thin-walled portion 63A is retracted to a position away from the thin-walled portion 63A. Therefore, compared to the case where filling with the resin material is completed without retracting the holding pin, it is possible to suppress the occurrence of cracks in the magnetic core 63 in the thin wall portion 63A.

(4) Other Embodiments The noise countermeasure member and the method for manufacturing the same have been described above using exemplary embodiments, but the above-mentioned embodiments are merely exemplified as one aspect of the present disclosure. That is, the present disclosure is not limited to the exemplary embodiments described above, and can be implemented in various forms without departing from the technical idea of the present disclosure.

For example, in the above embodiment, specific shapes and materials of the magnetic core, conductor, and mold member are illustrated, but the shapes and materials of the magnetic core, conductor, and mold member are not limited to the above examples.

Furthermore, the retraction timing of the holding pin described in the above embodiment may be arbitrarily adjusted in consideration of the shape and dimensions of the mold member, the performance of the injection molding machine, etc.

Note that a plurality of functions realized by one component illustrated in the above embodiment may be realized by a plurality of components. One function realized by one component illustrated in the above embodiment may be realized by a plurality of components. A plurality of functions realized by a plurality of constituent elements illustrated in the above embodiments may be realized by one constituent element. One function realized by the plurality of components illustrated in the above embodiment may be realized by one component. A part of the configuration illustrated in the above embodiment may be omitted. Among the embodiments described above, at least a part of the configurations exemplified in one embodiment may be added to or replaced with the configurations exemplified in any of the above embodiments other than the one embodiment.

Claims

a magnetic core made of a sintered body of magnetic material and shaped so that a conductor can be placed at a position penetrating the inner circumference;
a mold member formed of a resin material and configured to mold the magnetic core;
Equipped with
The magnetic core has a thin portion with a wall thickness of 1.5 mm to 4.0 mm corresponding to the dimension between the inner circumferential side and the outer circumferential side,
The mold member is an integrally molded product in which a part that molds the inner peripheral side of the thin wall part and a part that molds the outer peripheral side of the thin wall part are integrally molded with the resin material.
Noise countermeasure components.
The noise countermeasure member according to claim 1,
The conductor is disposed at a position penetrating the inner peripheral side of the magnetic core,
the mold member is configured to mold a part of the conductor together with the magnetic core;
Noise countermeasure components.
A method for manufacturing a noise countermeasure member, the method comprising:
The noise countermeasure member is
a magnetic core made of a sintered body of magnetic material and shaped so that a conductor can be placed at a position penetrating the inner circumference;
a mold member formed of a resin material and configured to mold the magnetic core;
Equipped with
The magnetic core has a thin portion with a wall thickness of 1.5 mm to 4.0 mm corresponding to the dimension between the inner circumferential side and the outer circumferential side,
The mold member is an integrally molded product in which a part that molds the inner peripheral side of the thin wall part and a part that molds the outer peripheral side of the thin wall part are integrally molded from the resin material,
When molding the mold member,
Before injecting the resin material into the mold, a holding pin is brought into contact with the magnetic core disposed in the mold to hold the magnetic core in the mold,
When injecting the resin material into the mold, at least the holding pin located at a position in contact with the thin wall portion is retracted to a position away from the thin wall portion at a predetermined timing;
A method for manufacturing noise countermeasure components.
A method for manufacturing a noise countermeasure member according to claim 3, comprising:
At least the holding pin located at a position in contact with the thin wall portion is retracted to a position away from the thin wall portion as the resin material is filled into the mold;
A method for manufacturing noise countermeasure components.