Title of invention: Laminated core, manufacturing method of laminated core, and rotary electric machine
Technical field
[0001]
The present invention relates to a laminated core, a method for manufacturing a laminated core, and a rotary electric machine.
This application claims priority based on Japanese Patent Application No. 2018-235867 filed in Japan on December 17, 2018, and the contents thereof are incorporated herein by reference.
Background technology
[0002]
Conventionally, as a core used in a rotary electric machine, a laminated core in which a plurality of electromagnetic steel sheets are laminated to each other is known. A plurality of electrical steel sheets are joined by methods such as welding, bonding, and caulking.
Patent Document 1 discloses a laminated core in which electromagnetic steel sheets after punching are bonded to each other with an epoxy resin, an acrylic resin, or the like.
Prior art literature
Patent documents
[0003]
Patent Document 1: Japanese Patent Application Laid-Open No. 2004-88970
Outline of the invention
Problems to be solved by the invention
[0004]
However, with the conventional technology such as Patent Document 1, it is difficult to obtain sufficient adhesive strength between the electromagnetic steel sheets after punching.
[0005]
An object of the present invention is to provide a laminated core in which electromagnetic steel sheets after punching are bonded to each other with high adhesive strength, a method for manufacturing the laminated core, and a rotary electric machine provided with the laminated core.
Means to solve problems
[0006]
One embodiment of the present invention has the following aspects.
[1] A plurality of electrical steel sheets laminated to each other and coated on both sides with an insulating coating,
It is provided with an adhesive portion that is arranged between the electromagnetic steel sheets that are adjacent to each other in the stacking direction and that adheres these electromagnetic steel sheets to each other.
All the sets of the electromagnetic steel sheets adjacent to each other in the laminating direction are bonded by the plurality of adhesive portions between the electromagnetic steel sheets.
The adhesive portions are provided at a plurality of locations between the electromagnetic steel sheets,
The laminated portion is formed of an adhesive containing one or both of an acrylic resin and an epoxy resin and having an SP value of 7.8 to 10.7 (cal / cm 3) 1/2. core.
[2] The laminated core according to [1], wherein the adhesive is an epoxy resin-based adhesive containing an epoxy resin and a phenol novolac resin.
[3] The laminated core according to [2], wherein the epoxy resin-based adhesive is an adhesive composed of 100 parts by mass of an epoxy resin and 5 to 35 parts by mass of a phenol novolac resin.
[4] The laminated core according to [2], wherein the epoxy resin-based adhesive is an adhesive composed of 100 parts by mass of epoxy resin, 5 to 35 parts by mass of phenol novolac resin, and 5 to 50 parts by mass of elastomer. ..
[5] The epoxy resin adhesive contains 100 parts by mass of epoxy resin, 5 to 35 parts by mass of phenol novolac resin, and a solvent 5 having an SP value of 7.0 to 10.7 (cal / cm 3) 1/2. The laminated core according to [2], which is an adhesive consisting of up to 10 parts by mass.
[6] The laminated core according to [2], wherein the epoxy resin-based adhesive further contains an acrylic resin.
[7] The laminate according to [6], wherein the epoxy resin adhesive is an adhesive composed of 100 parts by mass of an acrylic modified epoxy resin graft-polymerized with an acrylic resin and 5 to 35 parts by mass of a phenol novolac resin. core.
[8] The epoxy resin-based adhesive is an adhesive composed of 100 parts by mass of an acrylic modified epoxy resin graft-polymerized with an acrylic resin, 5 to 35 parts by mass of a phenol novolac resin, and 5 to 50 parts by mass of an elastomer. , [6].
[9] The laminated core according to [1], wherein the adhesive is an epoxy resin-based adhesive containing an epoxy resin having a glass transition temperature of 120 to 180 ° C. and an organic phosphorus compound.
[10] The laminated core according to [1], wherein the adhesive is an epoxy resin adhesive composed of 100 parts by mass of an epoxy resin and 5 to 35 parts by mass of an organic phosphorus compound.
[11] The adhesive is an epoxy resin-based adhesive containing an epoxy resin, an epoxy resin curing agent, and an elastomer.
The laminated core according to [1], wherein the bonded portion has an average tensile elastic modulus of 1500 to 5000 MPa at room temperature and an average tensile elastic modulus of 1000 to 3000 MPa at 150 ° C.
[12] The laminated core according to any one of [1] to [11], which is an adhesive laminated core for a stator.
[13] A rotary electric machine including the laminated core according to any one of [1] to [12].
[14] The method for manufacturing a laminated core according to [1].
A method for manufacturing a laminated core, in which the operation of applying the adhesive to the surface of the electrical steel sheet, then laminating it on another electrical steel sheet and crimping it to form the adhesive portion is repeated.
The invention's effect
[0007]
According to the present invention, it is possible to provide a laminated core in which electromagnetic steel sheets after punching are bonded to each other with high adhesive strength, a method for manufacturing the laminated core, and a rotary electric machine provided with the laminated core.
A brief description of the drawing
[0008]
FIG. 1 is a cross-sectional view of a rotary electric machine provided with an adhesive laminated core for a stator according to an embodiment of the present invention.
[Fig. 2] Fig. 2 is a side view of the laminated core for the same stator.
FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2 showing an example of an arrangement pattern of an adhesive portion of the adhesive laminated core for the same stator.
FIG. 4 is a side view showing a schematic configuration of a manufacturing apparatus for an adhesive laminated core for a stator.
Mode for carrying out the invention
[0009]
Hereinafter, with reference to the drawings, the adhesive laminated core for the stator and the rotary electric machine provided with the adhesive laminated core for the stator according to the embodiment of the present invention will be described. In the present embodiment, an electric motor as a rotary electric machine, specifically an AC electric motor, more specifically a synchronous electric motor, and even more specifically, a permanent magnet field type electric motor will be described as an example. This type of electric motor is suitably used for, for example, an electric vehicle.
[0010]
As shown in FIG. 1, the rotary electric machine 10 includes a stator 20, a rotor 30, a case 50, and a rotary shaft 60. The stator 20 and rotor 30 are housed in a case 50. The stator 20 is fixed in the case 50.
In the present embodiment, the rotor 30 is an inner rotor type in which the rotor 30 is located inside the stator 20 in the radial direction as the rotary electric machine 10. However, as the rotary electric machine 10, an outer rotor type in which the rotor 30 is located outside the stator 20 may be adopted. Further, in the present embodiment, the rotary electric machine 10 is a 12-pole 18-slot three-phase AC motor. However, the number of poles, the number of slots, the number of phases, and the like can be changed as appropriate.
The rotary electric machine 10 can rotate at a rotation speed of 1000 rpm by applying an exciting current having an effective value of 10 A and a frequency of 100 Hz to each phase, for example.
[0011]
The stator 20 includes an adhesive laminated core for a stator (hereinafter referred to as a stator core) 21 and a winding not shown.
The stator core 21 includes an annular core back portion 22 and a plurality of teeth portions 23. Hereinafter, the central axis O direction of the stator core 21 (or core back portion 22) is referred to as an axial direction, and the radial direction of the stator core 21 (or core back portion 22) (direction orthogonal to the central axis O) is referred to as a radial direction. The circumferential direction of the stator core 21 (or core back portion 22) (direction that orbits around the central axis O) is referred to as a circumferential direction.
[0012]
The core back portion 22 is formed in an annular shape in a plan view of the stator 20 when viewed from the axial direction.
The plurality of teeth portions 23 project from the inner circumference of the core back portion 22 toward the inside in the radial direction (toward the central axis O of the core back portion 22 along the radial direction). The plurality of tooth portions 23 are arranged at equal angular intervals in the circumferential direction. In the present embodiment, 18 tooth portions 23 are provided at every 20 degrees of the central angle centered on the central axis O. The plurality of tooth portions 23 are formed to have the same shape and the same size as each other. Therefore, the plurality of tooth portions 23 have the same thickness dimension as each other.
The winding is wound around the teeth portion 23. The winding may be a centralized winding or a distributed winding.
[0013]
The rotor 30 is arranged inside the stator 20 (stator core 21) in the radial direction. The rotor 30 includes a rotor core 31 and a plurality of permanent magnets 32.
The rotor core 31 is formed in an annular shape (annular ring) arranged coaxially with the stator 20. The rotating shaft 60 is arranged in the rotor core 31. The rotating shaft 60 is fixed to the rotor core 31.
The plurality of permanent magnets 32 are fixed to the rotor core 31. In this embodiment, a set of two permanent magnets 32 form one magnetic pole. The plurality of sets of permanent magnets 32 are arranged at equal angular intervals in the circumferential direction. In the present embodiment, 12 sets (24 in total) of permanent magnets 32 are provided at a central angle of 30 degrees about the central axis O.
[0014]
In this embodiment, an embedded magnet type motor is adopted as a permanent magnet field type motor. The rotor core 31 is formed with a plurality of through holes 33 that penetrate the rotor core 31 in the axial direction. The plurality of through holes 33 are provided corresponding to the arrangement of the plurality of permanent magnets 32. Each permanent magnet 32 ​​is fixed to the rotor core 31 in a state of being arranged in the corresponding through hole 33. The fixing of each permanent magnet 32 ​​to the rotor core 31 can be realized, for example, by adhering the outer surface of the permanent magnet 32 ​​and the inner surface of the through hole 33 with an adhesive. As the permanent magnet field type motor, a surface magnet type motor may be adopted instead of the embedded magnet type motor.
[0015]
Both the stator core 21 and the rotor core 31 are laminated cores. For example, as shown in FIG. 2, the stator core 21 is formed by laminating a plurality of electromagnetic steel sheets 40.
The product thickness (total length along the central axis O) of each of the stator core 21 and the rotor core 31 is, for example, 50.0 mm. The outer diameter of the stator core 21 is, for example, 250.0 mm. The inner diameter of the stator core 21 is, for example, 165.0 mm. The outer diameter of the rotor core 31 is, for example, 163.0 mm. The inner diameter of the rotor core 31 is, for example, 30.0 mm. However, these values ​​are examples, and the product thickness, outer diameter and inner diameter of the stator core 21, and the product thickness, outer diameter and inner diameter of the rotor core 31 are not limited to these values. Here, the inner diameter of the stator core 21 is based on the tip of the teeth portion 23 of the stator core 21. That is, the inner diameter of the stator core 21 is the diameter of a virtual circle inscribed in the tips of all the teeth portions 23.
[0016]
Each of the electromagnetic steel sheets 40 forming the stator core 21 and the rotor core 31 is formed, for example, by punching an electromagnetic steel sheet as a base material. As the electromagnetic steel sheet 40, a known electrical steel sheet can be used. The chemical composition of the electrical steel sheet 40 is not particularly limited. In this embodiment, a non-oriented electrical steel sheet is used as the electrical steel sheet 40. As the non-oriented electrical steel sheet, for example, a non-oriented electrical steel strip of JISC2552: 2014 can be adopted.
However, as the electromagnetic steel sheet 40, it is also possible to use a grain-oriented electrical steel sheet instead of the non-oriented electrical steel sheet. As the grain-oriented electrical steel sheet, for example, a grain-oriented electrical steel strip of JISC2553: 2012 can be adopted.
[0017]
Both sides of the electrical steel sheet 40 are covered with an insulating film in order to improve the workability of the electrical steel sheet and the iron loss of the stator core. As the substance constituting the insulating film, for example, (1) an inorganic compound, (2) an organic resin, (3) a mixture of an inorganic compound and an organic resin, and the like can be adopted. Examples of the inorganic compound include (1) a complex of dichromate and boric acid, and (2) a complex of phosphate and silica. Examples of the organic resin include epoxy resin, acrylic resin, acrylic styrene resin, polyester resin, silicon resin, fluororesin and the like.
[0018]
In order to ensure the insulation performance between the electromagnetic steel sheets 40 laminated with each other, the thickness of the insulating film (thickness per one side of the electromagnetic steel sheets 40) is preferably 0.1 μm or more.
On the other hand, the insulation effect saturates as the insulation film becomes thicker. Further, as the insulating film becomes thicker, the space factor decreases, and the performance as a stator core deteriorates. Therefore, the insulating coating should be as thin as possible to ensure the insulating performance. Absolute

The scope of the claims
[Claim 1]
With multiple electrical steel sheets laminated to each other and both sides covered with an insulating film,
It is provided with an adhesive portion that is arranged between the electromagnetic steel sheets that are adjacent to each other in the stacking direction and that adheres these electromagnetic steel sheets to each other.
All the sets of the electromagnetic steel sheets adjacent to each other in the laminating direction are bonded by the plurality of adhesive portions between the electromagnetic steel sheets.
The adhesive portions are provided at a plurality of locations between the electromagnetic steel sheets,
The laminated portion is formed of an adhesive containing one or both of an acrylic resin and an epoxy resin and having an SP value of 7.8 to 10.7 (cal / cm 3) 1/2. core.
[Claim 2]
The laminated core according to claim 1, wherein the adhesive is an epoxy resin-based adhesive containing an epoxy resin and a phenol novolac resin.
[Claim 3]
The laminated core according to claim 2, wherein the epoxy resin-based adhesive is an adhesive composed of 100 parts by mass of epoxy resin and 5 to 35 parts by mass of phenol novolac resin.
[Claim 4]
The laminated core according to claim 2, wherein the epoxy resin-based adhesive is an adhesive composed of 100 parts by mass of epoxy resin, 5 to 35 parts by mass of phenol novolac resin, and 5 to 50 parts by mass of elastomer.
[Claim 5]
The epoxy resin adhesive contains 100 parts by mass of epoxy resin, 5 to 35 parts by mass of phenol novolac resin, and 5 to 35 parts by mass of a solvent having an SP value of 7.0 to 10.7 (cal / cm 3) 1/2. The laminated core according to claim 2, which is an adhesive composed of parts.
[Claim 6]
The laminated core according to claim 2, wherein the epoxy resin adhesive further contains an acrylic resin.
[Claim 7]
The laminated core according to claim 6, wherein the epoxy resin adhesive is an adhesive composed of 100 parts by mass of an acrylic modified epoxy resin graft-polymerized with an acrylic resin and 5 to 35 parts by mass of a phenol novolac resin.
[Claim 8]
Claimed that the epoxy resin adhesive is an adhesive composed of 100 parts by mass of an acrylic modified epoxy resin graft-polymerized with an acrylic resin, 5 to 35 parts by mass of a phenol novolac resin, and 5 to 50 parts by mass of an elastomer. 6. The laminated core according to 6.
[Claim 9]
The laminated core according to claim 1, wherein the adhesive is an epoxy resin-based adhesive containing an epoxy resin having a glass transition temperature of 120 to 180 ° C. and an organic phosphorus compound.
[Claim 10]
The laminated core according to claim 1, wherein the adhesive is an epoxy resin-based adhesive composed of 100 parts by mass of an epoxy resin and 5 to 35 parts by mass of an organic phosphorus compound.
[Claim 11]
The adhesive is an epoxy resin adhesive containing an epoxy resin, an epoxy resin curing agent, and an elastomer.
The laminated core according to claim 1, wherein the bonded portion has an average tensile elastic modulus of 1500 to 5000 MPa at room temperature and an average tensile elastic modulus of 1000 to 3000 MPa at 150 ° C.
[Claim 12]
The laminated core according to any one of claims 1 to 11, which is an adhesive laminated core for a stator.
[Claim 13]
A rotary electric machine provided with the laminated core according to any one of claims 1 to 12.
[Claim 14]
The method for manufacturing a laminated core according to claim 1.
A method for manufacturing a laminated core, in which the operation of applying the adhesive to the surface of the electrical steel sheet, then laminating it on another electrical steel sheet and crimping it to form the adhesive portion is repeated.
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