JP2006135018A - Core of reactor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that noise cannot be reduced to a requested noise level only by improving bonding strength of fixing adhesive itself, although abutting parts of core members are bonded and fixed with high bonding strength and noise is reduced in the core of a conventional reactor. <P>SOLUTION: In the core 1 of the reactor, a pair of the oppositely arranged core members 11 are bonded and fixed through a gap spacer 12. Projections 12a abutting on the core members 11 are formed in bonding faces of the gap spacer 12 with the core members 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a core constituting a reactor mounted on a fuel cell vehicle or a hybrid vehicle.

Generally, reactors used in vehicles such as fuel cell vehicles and hybrid vehicles have a large current / high voltage specification, and therefore tend to generate large noise. In particular, since the generated frequency is a high frequency in the range of approximately 5 kHz to 20 kHz, it is required to suppress noise.
The core constituting this reactor is a pair of core materials composed of a plurality of laminated steel sheets impregnated with varnish, abutted against each other directly or via a gap spacer, and the abutting surfaces are bonded to each other with a fixing adhesive. It is often obtained by fixing, and vibration due to electromagnetic attraction between the laminated steel plates of the core is a major cause of noise generation.
Therefore, in order to suppress noise, it is necessary to take measures against vibration by electromagnetic attraction between laminated steel plates.

As such a vibration countermeasure, for example, there is one as shown in Patent Document 1.
In Patent Document 1, the adhesive strength between the abutting portions of the core material and the fixation between the core and the coil are high, such as a fixing adhesive having an adhesive strength of 100 kgf / cm 2 or more and a hardness Hv of 50 or more. A technique for reducing noise by using an adhesive is disclosed.

Japanese Patent No. 3255211

However, reactors for fuel cell vehicles and hybrid vehicles are subject to severe thermal and operating stresses in addition to noise that greatly exceeds the noise level of ordinary consumer products. Therefore, as in the technique described in the above-mentioned Patent Document 1, only by increasing the adhesive strength of the fixing adhesive itself for performing adhesive fixing between the abutting portions of the core material and fixing the core and the coil, Noise cannot be reduced to the required noise level. Furthermore, noise deterioration due to deterioration such as peeling of the bonded portion of the core is caused.
In other words, the noise level of the reactor depends on the adhesive quality between the abutting parts of the core material, but the adhesive quality is not only the adhesive strength (adhesive hardness), but also the spread area of the adhesive and the adhesive film thickness. Therefore, it is important to secure the spreading area and film thickness of the adhesive.
Accordingly, the present invention provides a reactor core capable of ensuring the spreading area and film thickness of the adhesive in addition to the adhesive strength, preventing the peeling of the core bonded portion caused by thermal stress, and suppressing noise generation. To do.

The core of the reactor of the present invention that solves the above problems has the following characteristics.
That is, as described in claim 1, a core of a reactor configured by bonding and fixing a pair of opposed core materials via a gap spacer, and the core material on a bonding surface of the gap spacer with the core material. A protrusion that abuts against the core material was formed, and the protrusion was brought into contact with the core material.
As a result of the protrusions formed on the gap spacer in this manner, a gap is formed between the gap spacer and the core material. By filling the gap with the fixing adhesive, the fixing adhesive can have a large thickness dimension, and the core material and the gap spacer can be brought into contact with the fixing adhesive over the entire surface, resulting in high adhesive strength. Can be maintained.
In addition, the contact area of the gap spacer surface with the fixing adhesive can be increased, and the adhesive strength can be increased.
As described above, by increasing the adhesive strength between the core material and the gap spacer, it is possible to prevent peeling of the bonded portion of the core material caused by thermal stress, and to suppress the generation of noise in the reactor.

According to a second aspect of the present invention, the height of the protrusion of the gap spacer is 0.1 to 0.2 mm.
Thereby, it is possible to maintain the high adhesive strength by bringing the fixing adhesive into contact with the entire surface of the core material and the gap spacer while suppressing the vibration due to the deformation of the core material during the operation of the reactor.

According to a third aspect of the present invention, a pair of opposed core materials are bonded and fixed via a gap spacer, and a guide member for positioning the core material and the gap spacer is provided at the bonded fixing portion of the core material. A core of a reactor configured, wherein a protrusion having a thickness larger than that of a gap spacer is formed on the guide member, and the protrusion is fitted between a pair of core members.
As described above, by fitting the protruding portion of the guide member between the guide cores, a gap is formed between the gap spacer and the core material. By filling the gap with the fixing adhesive, the fixing adhesive can have a large thickness dimension, and the core material and the gap spacer can be in contact with the fixing adhesive over the entire surface. Can be maintained.
In addition, the contact area of the gap spacer surface with the fixing adhesive can be increased, and the adhesive strength can be increased.
As described above, by increasing the adhesive strength between the core material and the gap spacer, it is possible to prevent peeling of the bonded portion of the core material caused by thermal stress, and to suppress generation of noise in the reactor.

According to a fourth aspect of the present invention, a gap of 0.1 to 0.2 mm is formed between each core material and the gap spacer.
Thereby, it is possible to maintain the high adhesive strength by bringing the fixing adhesive into contact with the entire surface of the core material and the gap spacer while suppressing the vibration due to the deformation of the core material during the operation of the reactor.

  According to the present invention, while securing a large thickness dimension of the fixing adhesive, the core material and the gap spacer can be in contact with the fixing adhesive over the entire surface, and the adhesive strength between the core material and the gap spacer can be increased, It is possible to prevent peeling of the bonded portion of the core material caused by thermal stress, and to suppress the generation of reactor noise.

Next, modes for carrying out the present invention will be described with reference to the accompanying drawings.
First, a first embodiment of a reactor core according to the present invention will be described.
The core 1 shown in FIG. 1 is configured by abutting and affixing the abutting surfaces 11a of a pair of core materials 11 opposed to each other via a flat gap spacer 12.

The core material 11 is configured by laminating a large number of thin steel plates formed in a substantially U shape. The core material 11 is impregnated with varnish, and the laminated steel plates are bonded together by this impregnated varnish.
The steel plates can be bonded to each other using an impregnating adhesive such as an epoxy or acrylic resin in addition to the impregnating varnish.
The gap spacer 12 interposed between the abutting surface 11a and the abutting surface 11a of the core material 11 is composed of a nonmagnetic and insulating member such as ceramic, glass, or a glass epoxy substrate. .

The abutting surface 11a of the core material 11 and the gap spacer 12 are bonded and fixed with an adhesive for fixing such as epoxy or acrylic.
As the fixing adhesive for bonding and fixing the abutting surface 11a of the core material 11 and the gap spacer 12, it is desirable to use an adhesive having a Shore hardness (D scale) of 80 or more when cured.

Although the core 1 is configured as described above, if the varnish remains attached to the abutting surface 11a of the core material 11 impregnated with the varnish, the bonding force between the varnish and the fixing adhesive is weak, so that the bonding is The strength is lowered.
Therefore, before the core material 11 is bonded and fixed, the varnish adhering to the abutting surface 11a is removed to expose the metal surface, thereby obtaining high adhesive strength.

As shown in FIG. 2, a plurality of protrusions 12 a are formed on the adhesive surface of the gap spacer 12 with the abutting surface 11 a of the core material 11. The protrusions 12 a are formed on both surfaces of the gap spacer 12.
The abutting surfaces 11 a of the core members 11 that abut against each other via the gap spacer 12 abut against the protrusion 12 a, and a gap 18 is formed between the abutting surface 11 a and the gap spacer 12.

The gap 18 is filled with a fixing adhesive 13, and the gap spacer 12 and the core material 11 are bonded and fixed.
The fixing adhesive 13 is applied so as to slightly wrap around the side surface of the core material 11 from the gap 18 to reinforce the adhesive strength between the core materials 11.
Further, the height dimension of the protrusion 12 a of the gap spacer 12 is formed to be about 0.1 to 0.2 mm, and the thickness of the fixing adhesive 13 filled in the gap 18 between the gap spacer 12 and the core material 11. The dimension d1 is also about 0.1 to 0.2 mm.

  The thickness dimension d1 of the fixing adhesive 13 is preferably as thin as possible in order to suppress the vibration generated by the deformation of the core material 11 due to the electromagnetic attractive force during the reactor operation. However, in the core 1 of the present reactor, For the following reasons, the protrusion 12a is formed on the gap spacer 12 to ensure a thickness dimension d1 of about 0.1 to 0.2 mm.

In other words, when the fixing adhesive 13 is cured, minute gaps existing on the surface of the adhesive fixing portion of the core material 11 (especially in the case of the core material 11 composed of laminated steel plates) and moisture adhering to the surface. However, it may vaporize and expand to form voids (bubbles).
When the thickness of the adhesive is small, the generated void becomes a void penetrating from the abutting surface 11a of the core material 11 to the gap spacer 12. This penetrating void becomes an unbonded portion between the abutting surface 11a and the gap spacer 12, and the bonding area between the two decreases, resulting in a decrease in bonding strength.

On the other hand, when the adhesive thickness is as thick as about 0.1 to 0.2 mm, the generated bubbles are buried in the adhesive layer and appear on the abutting surface 11 a of the core material 11 and the surface of the gap spacer 12. Therefore, the occurrence of an unbonded portion between the abutting surface 11a and the gap spacer 12 is suppressed, and the abutting surface 11a and the gap spacer 12 are in contact with the fixing adhesive over the entire surface, thereby maintaining high adhesive strength. be able to.
Further, by forming the protrusion 12a on the gap spacer 12, the contact area with the fixing adhesive on the surface of the gap spacer 12 can be increased, and the adhesive strength can be increased.

In this way, by increasing the adhesive strength between the abutting surface 11a of the core material 11 and the gap spacer 12, it is possible to prevent peeling of the bonded portion of the core material 11 caused by thermal stress and to suppress the generation of noise in the reactor. it can.
In particular, by setting the adhesive thickness to a thickness of about 0.1 to 0.2 mm, it is for fixing over the entire surface of the core material 11 and the gap spacer 12 while suppressing the vibration caused by the deformation of the core material 11 during the reactor operation. High adhesive strength can be maintained by contacting the adhesive.

Further, when the gap spacer 12 is made of ceramics, it can be constituted by compacting and firing a powdery material such as alumina.
As shown in FIG. 3, the gap spacer 12 formed with the protrusions 12a is, for example, a gap spacer 12 in which a plurality of protrusions 12a are scattered in an island shape, or a substantially “ten” character as shown in FIG. As shown in FIG. 5, the gap spacer 12 formed on the entire surface of the protrusion 12a formed in the shape, or the protrusion 12a formed in a substantially “X” shape by connecting the opposing vertices of the surface of the gap spacer 12 The gap spacer 12 may be provided.

As described above, the protrusions 12a are formed in various shapes and the like. In any case, the fixing adhesive 13 is applied so that the applied fixing adhesive 13 is filled in the gap 18 without any gap. The shape and arrangement are determined in consideration of the spread and flow.
In addition, since the shape of the protrusion 12a can be simultaneously formed by a mold for forming the gap spacer 12, the gap spacer 12 formed with the protrusion 12a is less expensive than the gap spacer 12 where the protrusion 12a is not formed. It is possible to configure without raising.

Next, a second embodiment of the core 1 of the reactor will be described.
6 and 7, the abutting surfaces 61 a of a pair of core materials 61 arranged to face each other are abutted and fixed to each other via a flat gap spacer 62, and the core material 61 is adhered. A guide member 70 for positioning the core material 61 and the gap spacer 61 is provided in the fixed portion.

The core material 61 in this embodiment is configured in the same manner as the core 11 of the first embodiment shown in FIG.
Further, the gap spacer 62 in the present embodiment is also made of a non-magnetic and insulating member as in the gap spacer 12 of the first embodiment, but the protruding portion 12a is not formed.
Furthermore, the fixing adhesive 63 that bonds and fixes the core members 61 to each other via the gap spacer 62 is also configured in the same manner as the fixing adhesive 13 of the first embodiment.

As shown in FIG. 8, the guide member 70 includes a frame-shaped member 71 that covers the outer periphery of the adhesive fixing portion of the core material 61, guide portions 72 and 73 that protrude inside the frame-shaped member 71, and a spacer portion 74. It is formed integrally.
The guide member 70 is a molded member molded by injection molding using, for example, a PPS (Polyphenylene Sulfide) resin as a raw material.

A plurality of guide portions 72 projecting inward from the frame-like member 71 are formed at two opposing side surfaces 70 a and 70 c of the frame-like member 71, and the guide portion 73 includes two opposite portions of the frame-like member 71. A plurality of portions are formed on each of the side surfaces 70b and 70d.
The distance between the guide portion 72 formed on the side surface 70 a of the frame-shaped member 71 and the guide portion 72 formed on the side surface 70 c is formed to be approximately the same as the width L 1 of the core material 61. The distance between the guide portion 73 formed on the side surface 70b and the guide portion 73 formed on the side surface 70d is substantially the same as the length L2 of the core material 61.

The spacer portion 74 protrudes inward from the guide portion 73. The thickness dimension d2 of the spacer portion 74 is formed to be smaller than the thickness dimension d3 of the guide portion 73, and the spacer portion 74 is disposed at approximately the center in the vertical direction on the side surfaces 70 b and 70 d of the frame-like member 71.
The distance between the spacer portion 74 formed on the side surface 70b of the frame-like member 71 and the spacer portion 74 formed on the side surface 70d is formed to be substantially the same as the length dimension L3 of the gap spacer 62. The length dimension L3 of 62 is formed smaller than the length dimension L2 of the core material 61.
The width dimension of the gap spacer 62 is substantially the same as the width dimension L1 of the core material 61.

The guide member 70 configured in this manner is fitted to the adhesive fixing portion when the pair of core materials 61 are butted and fixed, thereby positioning the core materials 61 and the core material 61 and the gap spacer 62. And positioning can be performed.
That is, the pair of core members 61 are positioned by the guide portions 72 and 73 formed on the side surfaces 70a, 70b, 70c, and 70d of the frame-shaped member 71, and formed on the side surfaces 70a and 70c of the frame-shaped member 71. The gap spacer 62 is positioned with respect to the core material 61 by the guide portion 72 and the spacer portion 74 protruding inward from the guide portion 73.
Thereby, the assembly accuracy of the core 1 is increased and the assembly workability is improved.

In this case, as shown in FIG. 6, the spacer portion 74 is fitted between a pair of abutting core materials 61, and the core material 61 and the core material 61 are the thickness of the spacer portion 74. The adhesive is fixed in a state separated by a dimension d2.
The thickness d2 of the spacer portion 74 is formed to be larger than the thickness dimension of the gap spacer 62, and a gap 68 having a dimension d5 is formed between the abutting surface 61a of the core material 61 and the gap spacer 62. Is done.

The gap 68 is filled with a fixing adhesive 63, and the gap spacer 62 and the core material 61 are bonded and fixed.
Further, the fixing adhesive 63 has a recess 75 formed between the guide portions 72 and 73 of the guide member 70, and the space formed by the recess 75, the core material 61 and the gap spacer 62 is also filled. The side surfaces of the core material 61 are also bonded to reinforce the bonding strength between the core materials 61.
Further, the thickness d2 of the spacer portion 74 is set such that the dimension d5 on both sides of the gap spacer 62 is about 0.1 to 0.2 mm, and the gap spacer 62, the core material 61, and the like. The thickness dimension of the fixing adhesive 63 filled in the gap 68 is also about 0.1 to 0.2 mm.

As described above, the spacer 61 of the guide member 70 is fitted between the core material 61 and the core material 61 so that the core material 61 and the core material 61 are bonded and fixed. The thickness of the fixing adhesive 63 with the spacer 62 can be maintained at a thickness of about 0.1 to 0.2 mm, and the core material 11 can be bonded and fixed with high adhesive strength.
In particular, by setting the adhesive thickness to a thickness of about 0.1 to 0.2 mm, it is for fixing over the entire surface of the core material 61 and the gap spacer 62 while suppressing vibration caused by the deformation of the core material 61 during the operation of the reactor. High adhesive strength can be maintained by contacting the adhesive.
Thereby, peeling of the adhesion part of the core material which arises by heat stress can be prevented, and generation | occurrence | production of the noise of a reactor can be suppressed.

It is a perspective view which shows the core of the reactor concerning this invention. It is side surface sectional drawing which shows 1st embodiment of the adhesion fixing part of a core material. It is a perspective view which shows the 1st Example of the gap spacer which formed the projection part. It is a perspective view which shows the 2nd Example of the gap spacer which formed the projection part. It is a perspective view which shows the 3rd Example of the gap spacer which formed the projection part. It is side surface sectional drawing which shows 2nd embodiment of the adhesion fixing part of a core material. It is a plane sectional view showing a second embodiment of an adhesion fixing part of a core material. It is a perspective view which shows the guide member provided in the adhesion fixing part of a core material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Core 11 Core material 12 Gap spacer 12a Protrusion part 13 Fixing adhesive 70 Guide member

Claims (4)

A core of a reactor constituted by bonding and fixing a pair of opposed core materials via a gap spacer,
A core of a reactor, wherein a protrusion contacting the core material is formed on an adhesive surface of the gap spacer with the core material.   The reactor core according to claim 1, wherein the height of the protrusion of the gap spacer is 0.1 to 0.2 mm. A core of a reactor in which a pair of opposed core materials are bonded and fixed via a gap spacer, and a guide member for positioning the core material and the gap spacer is provided in an adhesive fixing portion of the core material. ,
A core of a reactor, wherein a protrusion having a thickness larger than that of a gap spacer is formed on the guide member, and the protrusion is fitted between a pair of core members.   The core of the reactor according to claim 3, wherein a gap of 0.1 to 0.2 mm is formed between each core material and the gap spacer.

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