WO2020003906A1

WO2020003906A1 - Stacked core

Info

Publication number: WO2020003906A1
Application number: PCT/JP2019/021916
Authority: WO
Inventors: 前田　茂; 尚希藤田; 淳也田中; 亮磨佐々木
Original assignee: 日本電産株式会社
Priority date: 2018-06-29
Filing date: 2019-06-03
Publication date: 2020-01-02
Also published as: CN112335155A

Abstract

This stacked core 10 has a plurality of stacked plates and an adhesive for bonding the plates together. The plurality of plates includes holes 111 that penetrate in the stacking direction, protruding plates 110 that respectively have a protrusion 112 that protrudes into the hole 111, and two lid plates 130 that are disposed on both sides of the protruding plates 110 in the stacking direction, and spaces 101 formed by covering the respective holes 111 with the respective two lid plates 130 are filled with the adhesive.

Description

Laminated core

The present invention relates to a laminated core.

Hitherto, it has been studied to laminate iron core pieces and integrate them with an adhesive to produce a laminated iron core (laminated core) (see, for example, JP-A-2006-288114). In Japanese Patent Laid-Open Publication No. 2006-288114, an iron core piece having an adhesive application hole and an iron core piece having no adhesive application hole are bonded by an adhesive.

JP 2006-288114 A

However, in the method described in Japanese Patent Application Laid-Open Publication No. 2006-288114, the bonding area between the adhesive and the iron core piece is too small, and there is a possibility that sufficient bonding strength may not be obtained. In order to solve such a problem, in order to increase the bonding area between the adhesive and the iron core piece, there is a method of increasing the number of adhesive application holes or increasing the hole diameter. However, in these methods, the magnetic permeability of the laminated core is reduced as compared with the case where the holes are not provided, so that the magnetic characteristics of the laminated core may be reduced and the motor driving efficiency may be reduced. An object of the present invention is to provide a laminated core having high adhesive strength while suppressing a decrease in magnetic properties.

One embodiment of the laminated core of the present invention is a laminated core having a plurality of laminated plates and an adhesive for bonding the plates, wherein the plurality of plates have a hole penetrating in the laminating direction, and a hole in the hole. A space formed by closing the hole with the two cover plates, the space being filled with an adhesive. Have been.

According to one aspect of the present invention, by providing a protrusion protruding into the hole, the contact area between the adhesive and the plate can be increased, and the adhesive strength can be increased while suppressing the decrease in magnetic properties.

FIG. 1 is a sectional view showing the configuration of the motor. FIG. 2A is a plan view showing the configuration of the laminated core, and FIG. 2B is a cross-sectional view taken along line II in FIG. 2A. FIG. 3 is an enlarged view of a portion A (portion surrounded by a broken line) in FIG. FIG. 4 is a plan view showing a configuration example of the projection plate. FIG. 5 is a plan view and a cross-sectional view illustrating another configuration example of the protruding plate and the laminated core. FIG. 6 is a plan view and a cross-sectional view illustrating another configuration example of the protruding plate and the laminated core. FIG. 7 is a cross-sectional view illustrating another configuration example of the protruding plate and the laminated core. FIG. 8 is a cross-sectional view illustrating another configuration example of the protruding plate and the laminated core.

Hereinafter, the laminated core of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings. FIG. 1 is a cross-sectional view showing a configuration of a motor, FIG. 2A is a plan view showing a configuration of a laminated core, and FIG. 2B is a cross-sectional view taken along line II in FIG. 3 is an enlarged view of a portion A (portion surrounded by a broken line) in FIG. 2B, and FIG. 4 is a plan view showing one configuration example of the protrusion.

The motor 1 shown in FIG. 1 is, for example, an outer rotor type motor. The motor 1 includes a support member 40, a rotor 30 having a shaft 31 about the center axis J <b> 1, and a stator 20. In the following description, a direction parallel to the direction in which the central axis J1 extends may be referred to as a “vertical direction”. The vertical direction is a name used merely for description, and does not limit the actual positional relationship and direction of the motor 1. Further, a radial direction about the center axis J1 may be simply referred to as a “radial direction”, and a circumferential direction about the center axis J1 may be simply referred to as a “circumferential direction”.

The support member 40 has a cylindrical shape extending vertically about the central axis J1. The rotor 30 has a shaft 31, a magnet holding part 32, and a magnet 33. The shaft 31 is rotatably supported by the support member 40 via a bearing fixed to the inner peripheral surface of the support member 40. The magnet holding portion 32 has a cylindrical shape that opens downward, and is fixed to the upper end of the shaft 31. The magnet 33 is fixed to a radially inner surface of the magnet holding part 32.

The rotor 30 faces the stator 20 via a gap. In FIG. 1, the magnet 33 radially opposes a laminated core 10 described later via a gap. The magnet 33 is arranged radially outside the laminated core 10. The stator 20 includes the laminated core 10, an insulator 21 mounted on the laminated core 10, and a coil 22 wound around a later-described tooth 12 via the insulator 21. By passing a current through the coil 22, a magnetic flux is generated in the laminated core 10 as a magnetic core.

As shown in FIG. 1, the laminated core 10 is fixed to the outer peripheral surface of the support member 40. The laminated core 10 has a core back 11, a plurality of teeth 12, and a plurality of umbrellas 13. The core back 11 has a cylindrical shape centered on the central axis J1. The magnetic flux generated in the core back 11 extends in the circumferential direction. The teeth 12 extend from the core back 11 in the radial direction. The magnetic flux is generated in the direction in which the teeth 12 extend. In FIG. 2, the teeth 12 extend radially outward from the core back 11. The plurality of teeth 12 are arranged at equal intervals along the circumferential direction. The umbrella 13 is located on the side opposite to the core back 11 with respect to each tooth 12, and extends so that the longitudinal direction is orthogonal to the radial direction. The magnetic flux generated in the teeth 12 passes through the umbrella 13 and the core back 11 along the circumferential direction.

The laminated core 10 is configured by laminating a plurality of plates 100. Each plate 100 has a shape that expands in the radial direction. The laminated plates 100 are bonded to each other with an adhesive (not shown). Each plate 100 has a core back plate portion 81, a teeth plate portion 82, and an umbrella plate portion 83. The core back plate portion 81 has an annular plate shape centered on the central axis J1. The core back 11 is formed by vertically stacking a plurality of core back plate portions 81. That is, the core back plate portion 81 forms a part of the core back 11.

The teeth plate 82 extends radially outward from the core back plate 81. The teeth 12 are configured by vertically stacking the tooth plate portions 82 of a plurality of plates. That is, the teeth plate portion 82 forms a part of the teeth 12. The umbrella plate portion 83 is located on the side opposite to the core back portion 81 with respect to each tooth plate portion 82, and extends so that the longitudinal direction is orthogonal to the radial direction. The umbrella 13 is formed by vertically stacking the umbrella plate portions 83 of a plurality of plates. That is, the umbrella plate 83 constitutes a part of the umbrella 13. Thus, each plate 100 including the protruding plate 110 has a shape as if the long portions (the core back plate portion 81, the teeth plate portion 82, and the umbrella plate portion 83) were connected.

Examples of the constituent material (soft magnetic material) of each plate 100 include electromagnetic steel (silicon steel), carbon steel, structural steel, pure iron, soft iron, stainless permalloy, and the like. In the present configuration example, the plurality of plates 100 configuring the laminated core 10 include a protruding plate 110, a hole plate 120, and a lid plate 130. The projection plate 110 has a hole 111 penetrating in the stacking direction (thickness direction) of the plurality of plates 100 and a projection 112 projecting into the hole 111. The hole plate 120 has a hole 121 penetrating in the laminating direction. The cover plates 130 are arranged on both sides of the protruding plate 110 in the stacking direction. The cover plate 130 is a (non-porous) flat plate having no hole penetrating in the stacking direction.

In this configuration example, one protruding plate 110 and one hole plate 120 are continuously laminated such that the holes 111 and the holes 121 communicate with each other, and this laminated body is separated from both sides in the vertical direction (the laminating direction) by two. Between the two lid plates 130. The perforated plate 120 is disposed between the lid plate 130 and the protruding plate 110. The hole 111 and the hole 121 are connected, and the

connected holes

111 and 121 are closed with two cover plates 130 to form one space 101. This space 101 is filled with the above-mentioned adhesive, and the plates 100 are bonded to each other. According to such a configuration, since the protrusion 112 projects into the hole 111, the adhesive enters around the protrusion 112. Therefore, the adhesive strength of the laminated core 10 can be increased by increasing the contact area between each plate 100 and the adhesive while suppressing a decrease in the magnetic properties of the laminated core 10. The adhesive includes, for example, a thermosetting resin such as an epoxy-based adhesive, a melamine-based adhesive, and a phenol-based adhesive.

As shown in FIG. 3, the projection 112 has a bent portion that bends (or curves) downward from the base. With such a configuration, the protrusion 112 is sandwiched in the laminating direction by the adhesive. As a result, an anchor effect for the adhesive is generated by the projections 112, and the respective plates 100 are more firmly bonded in the vertical direction. For this reason, the adhesive strength of the laminated core 10 can be further increased. As shown in FIG. 4A, in the hole 111 located in the tooth plate portion 82, the protrusion 112 extends along the longitudinal direction (radial direction) of the long portion (the tooth plate portion 82). In other words, the protrusion 112 extends along a magnetic flux (magnetic path) generated in the laminated core 10. As a result, a decrease in the magnetic properties of the laminated core 10 can be more suitably suppressed.

The projection 112 has a constant width when viewed from the stacking direction (in a plan view) and a continuous portion with the first portion 112a, and the width continuously decreases toward the tip. (Changed) second portion 112b. The protrusion 112 having the first portion 1112a having a constant width as described above can be easily processed as a bent portion. In addition, as shown in FIG. 4B, the protrusion 112 may be configured with only the second portion 112b without the first portion 112a. In this case, it is easy to set the plane area of the projection 112 (the second portion 112b) to be larger than the opening area of the hole 111. Thereby, the contact area between the protrusion 112 and the adhesive can be further increased.

In addition, the width of the second portion 112b may decrease stepwise (stepwise) toward the front end. Further, the width of the second portion 112b may increase continuously or stepwise toward the tip. Further, the second portion 112b may have a shape obtained by combining them. From the viewpoint of increasing the adhesive strength between the protrusion plate 110 and the hole plate 120 and the adhesive, at least one of the inner surface of the hole 111, the outer surface of the protrusion 112, and the inner surface of the hole 121 has a rough surface such as a blast treatment or a solvent treatment. May be applied.

Such a laminated core 10 can be manufactured, for example, as follows. First, after fixing the cover plate 130 to a fixture such as a mold or a jig, the hole plate 120 and the protrusion plate 110 are sequentially stacked on the cover plate 130 such that the holes 121 and the holes 111 are connected. . Next, the tip of the nozzle is positioned on the

holes

111 and 121, and the adhesive is injected (filled) into the

holes

111 and 121. Then, after disposing the lid plate 130 on the protruding plate 110, the adhesive is cured. As a result, the

plates

110, 120, and 130 are bonded.

By repeating the above steps, the laminated core 10 is manufactured. Note that it is preferable to apply a fluorine-based release agent such as polytetrafluoroethylene to the surface of the fixture. Thereby, it is possible to prevent adhesion of the adhesive to the fixture and adhesion between the fixture and the laminated core 10.

Next, another configuration example of the protruding plate 110 and the laminated core 10 will be described. FIG. 5 is a plan view and a cross-sectional view illustrating another configuration example of the projection plate and the laminated core. 5 (a), 5 (b) and 5 (c) are plan views, respectively. FIG. 5A is a cross-sectional view taken along the line II-II in FIG. In the configuration example shown in FIG. 5A, the projection plate 110 has a plurality (two) of projections 112. Thereby, the contact area between each plate 100 and the adhesive can be further increased, and the adhesive strength of the laminated core 10 can be further increased. The two protrusions 112 are arranged to face each other, and extend along the same direction when viewed from the stacking direction (in plan view). According to this configuration, the weight balance of the laminated core 10 and the adhesion balance with the adhesive are improved. Further, the two protrusions 112 extend along a magnetic path that is a longitudinal direction of the tooth plate portion 82 (long portion). As a result, a decrease in the magnetic properties of the laminated core 10 can be more suitably suppressed. As shown in FIG. 5A ′, each projection 112 has a bent portion that bends (or curves) downward from its root.

In the configuration example shown in FIG. 5B, the two protrusions 112 extend in different directions at 90 ° to each other when viewed from the stacking direction (in a plan view). According to this configuration, since the protrusions 112 extend in a plurality of directions, the adhesive strength of the laminated core 10 can be increased in a plurality of directions. As shown in FIG. 5B, when the hole 111 is located at the boundary between the tooth plate portion 82 and the umbrella plate portion 83, one of the protrusions 112 is in the longitudinal direction of the tooth plate portion 82 (long portion). And the other protrusion 112 is preferably formed so as to extend along the longitudinal direction of the umbrella part 83 (long part).

Further, as shown in FIG. 5C, when the hole 111 is located in the core back plate portion 81, the two protrusions 112 extend along the circumferential direction which is the longitudinal direction of the core back plate portion 81 (long portion). It is preferably formed so as to extend. According to the configuration examples shown in FIG. 5B and FIG. 5C, the magnetic path is less likely to be interrupted, and the deterioration of the magnetic characteristics of the laminated core 10 can be suppressed more appropriately. The number of the protrusions 112 is not limited to two, and may be three or more.

FIG. 6 is a plan view and a cross-sectional view illustrating another configuration example of the protruding plate and the laminated core. FIG. 6A and FIG. 6B are plan views, respectively. FIG. 6A is a cross-sectional view taken along the line III-III in FIG. FIG. 6B ′ is a cross-sectional view taken along line IV-IV in FIG. 6B. In the configuration examples shown in FIGS. 6A and 6A ′, a stacked body in which the hole plates 120 are stacked on both sides of the protruding plate 110 in the stacking direction is sandwiched between two lid plates 130. Further, the protrusion 112 has a bridge portion 112c that bridges across the hole 111. According to such a configuration, as shown in FIG. 6A ′, the periphery of the bridge portion 112c is surrounded by the adhesive, so that the contact area between each plate 100 and the adhesive increases, and the laminated core 10 Can further increase the adhesive strength. Further, since the protruding plate 110 can be manufactured only by punching a plate material, the manufacturing is facilitated. The bridge portion 112c extends along a magnetic path that is a longitudinal direction of the tooth plate portion 82 (a long portion) when viewed from the laminating direction (in a plan view). As a result, a decrease in the magnetic properties of the laminated core 10 can be more suitably suppressed.

In the configuration examples shown in FIGS. 6B and 6B ′, a stacked body in which one projection plate 110 and one hole plate 120 are stacked is sandwiched between two lid plates 130. Further, the protrusion 112 further has two branch portions 112d branched from the bridge portion 112c. Thereby, the contact area between each plate 100 and the adhesive can be further increased, and the adhesive strength of the laminated core 10 can be further increased. Each branch 112d extends in a direction inclined with respect to the stacking direction, as shown in FIG. According to such a configuration, the anchor effect of the protrusion 112 on the adhesive can be further enhanced. As shown in FIG. 6B, when the hole 111 is located at the boundary between the teeth plate portion 82 and the umbrella plate portion 83, the two branch portions 112d are connected to the umbrella plate portion 83 (long portion). It is preferable that it is formed so as to extend along the magnetic path which is the longitudinal direction. Further, one or both of the two branch portions 112d may extend in a direction orthogonal to the stacking direction, and the number of the branch portions 112d is not limited to two and may be one or three or more. .

FIG. 7 is a cross-sectional view illustrating another configuration example of the protruding plate and the laminated core. In the configuration example illustrated in FIG. 7A, a stacked body in which two continuous protrusion plates 110 and one hole plate 120 are stacked is sandwiched between two lid plates 130. Each of the two protrusion plates 110 has one protrusion 112, and the two protrusions 112 extend along different directions when viewed from the stacking direction. In the illustrated configuration example, one protrusion 112 extends from the left side to the right side, and the other protrusion 112 extends from the back side of the paper to the front side. According to such a configuration, the adhesive strength of the laminated core 10 can be further increased.

In the configuration example illustrated in FIG. 7B, a stacked body in which two continuous protrusion plates 110 and one hole plate 120 are stacked is sandwiched between two lid plates 130. Each of the two protrusion plates 110 has one protrusion 112, and the two protrusions 112 extend along the same direction when viewed from the stacking direction. According to this configuration, the weight balance of the laminated core 10 and the adhesion balance with the adhesive are improved.

In the configuration example shown in FIG. 7C, a stacked body in which the hole plates 120 are stacked on both sides of the protruding plate 110 in the stacking direction is sandwiched between two lid plates 130. The projection plate 110 has two projections 112 facing each other, and the two projections 112 are bent or curved in directions different from each other with respect to the stacking direction. According to such a configuration, the adhesive strength of the laminated core 10 can be further increased.

FIG. 8 is a cross-sectional view showing another configuration of the protruding plate and the laminated core. In the configuration example illustrated in FIG. 8, a stacked body in which two protruding plates 110 are continuously stacked is sandwiched between two lid plates 130. In addition, the protrusion 112e has a portion that exists along the edge of the hole 111 and whose thickness continuously decreases toward the inside of the hole 111. That is, the inner surface of the projection 112e has a truncated cone side surface shape, and the opening area of the hole 111 continuously decreases from the upper side to the lower side in the stacking direction. According to such a configuration, the mechanical strength of the protrusion 112e can be increased as compared with the elongated protrusion 112. Further, the adhesive can be filled in the hole 111 without any gap.

In FIG. 8A, the two protruding plates 110 are stacked in a state where they are turned upside down. On the other hand, in FIG. 8B, the two protruding plates 110 are stacked with the upper and lower sides in the same direction. According to the configuration example shown in FIGS. 8A and 8B, the number of types of the plate 100 to be manufactured can be reduced, which contributes to a reduction in man-hour and cost required for manufacturing the laminated core 10. Also, with such a configuration, the adhesive strength of the laminated core 10 can be increased.

The number of the projection plates 110 is not limited to two, and may be three or more. Further, the thickness of the protrusion 112e may be reduced stepwise (stepwise) toward the inside of the hole 111. Further, the thickness of the protrusion 112e may be increased stepwise (stepwise) toward the inside of the hole 111. Further, the protrusion 112e may have a shape obtained by combining these.

The above is the description of the present embodiment, but the present invention is not limited to the above configuration, and various modifications can be made within the technical idea of the present invention. For example, the laminated core 10 may be manufactured by combining two or more types of the different types of protrusion plates 110 described above. Although the laminated cores 10 of the above configuration examples each have the perforated plate 120, the plate thickness of the perforated plate 12 may be changed or the perforated plate 120 may be omitted. When the perforated plate 120 is omitted, the protrusion 112 extends in a direction perpendicular to the stacking direction without bending or bending.

Further, the number of plates 100 constituting the laminated core 10 is set according to the size of the laminated core 10 and the like. In addition, as long as the space 101 is formed, the arrangement of the projection plate 110, the hole plate 120, and the cover plate 130 is arbitrary. Further, the cover plate 130 may have a hole penetrating in the stacking direction. However, the holes of the cover plate 130 are formed in the cover plate 130 so as not to be connected to the holes 111 and the holes 121 when the cover plate 130, the projection plate 110, and the hole plate 120 are stacked. Thereby, the cover plate 130 can play the same role as the hole plate 120. For this reason, the contact area between each plate 100 and the adhesive can be further increased, and the adhesive strength of the laminated core 10 can be further increased. Further, the motor 1 of the present invention is not limited to the outer rotor type, and may be an inner rotor type. Further, the laminated core of the present invention can be used not only for the stator 20 but also for the rotor 30.

DESCRIPTION OF SYMBOLS 1 ... Motor, 10 ... Laminated core, 11 ... Core back, 12 ... Teeth, 13 ... Umbrella, 20 ... Stator, 21 ... Insulator, 22 ... Coil, 30 ... Rotor, 31 ... Shaft, 32 ... Magnet holding part, 33 ... Magnet, 40 support member, 81 core back plate portion, 82 tooth portion, 83 umbrella plate portion, 100 plate, 101 space, 110 projecting plate, 111 hole, 112, 112e projecting, 112a 1st part, 112b ... 2nd part, 112c ... Bridge part, 112d ... Branch part, 120 ... Hole plate, 121 ... Hole, 130 ... Cover plate, J1 ... Central axis

Claims

A laminated core having a plurality of laminated plates and an adhesive for bonding the plates,

The plurality of plates include a hole that penetrates in the stacking direction, a protrusion plate having a protrusion protruding into the hole, and two lid plates disposed on both sides of the protrusion plate in the stacking direction,

A laminated core, wherein a space formed by closing the hole with the two cover plates is filled with the adhesive.
The plurality of plates further includes a hole plate that is disposed between at least one of the two lid plates and the protruding plate and has a hole that penetrates in a stacking direction.

2. The laminated core according to claim 1, wherein the hole of the projecting plate is connected to the hole of the hole plate, and the space is formed by closing the connected hole with the two lid plates. 3.
3. The laminated core according to claim 2, wherein one of the protruding plates and one of the perforated plates are continuously laminated, and the laminated protruding plate and the perforated plate are sandwiched between the two lid plates. 4.
Between the two lid plates, a plurality of the protruding plates are continuously laminated,

The multilayer core according to claim 1, wherein the projections of the plurality of projection plates extend along different directions when viewed from the stacking direction.
The laminated core according to any one of claims 2 to 4, wherein the protrusion is bent or curved in a laminating direction and has a bent portion sandwiched in the laminating direction by the adhesive.
The protruding plate has a shape like connecting a plurality of long portions,

The laminated core according to any one of claims 1 to 5, wherein the protrusion extends along a longitudinal direction of the long portion.
The projection plate has an annular core back plate portion and a teeth plate portion extending radially outward from the core back plate portion,

The laminated core according to claim 6, wherein the hole is located in the teeth plate portion, and the protrusion extends along a radial direction.
The projection plate has an annular core back plate portion and a teeth plate portion extending radially outward from the core back plate portion,

The laminated core according to claim 6, wherein the hole is located in the core back plate portion, and the protrusion extends along a circumferential direction.
The laminated core according to any one of claims 1 to 8, wherein the projection has a portion having a constant width.
The laminated core according to any one of claims 1 to 9, wherein the protrusion has a portion whose width changes toward a tip.
The laminated core according to any one of claims 1 to 10, wherein the projection plate has a plurality of the projections.
The laminated core according to claim 11, wherein the plurality of protrusions extend along the same direction when viewed from the laminating direction.
The laminated core according to claim 11, wherein the plurality of protrusions extend along different directions when viewed from the laminating direction.
14. The laminated core according to claim 1, wherein the protrusion has a cross-linking portion cross-linking the hole.
The laminated core according to claim 14, wherein the protrusion has a branch portion branched from the bridge portion.
The laminated core according to claim 13, wherein the branch portion extends in a direction orthogonal to or inclined from the laminating direction.
The laminated core according to any one of claims 1 to 3, wherein the protrusion exists along an edge of the hole and has a portion whose thickness changes toward the inside of the hole.
The laminated core according to claim 17, wherein a plurality of the protruding plates are continuously laminated, and the laminated plurality of the protruding plates are sandwiched between the two lid plates.