EA044446B1 - LAMED CORE AND ELECTRIC MOTOR - Google Patents

Description

Field of technology to which the invention relates

The present invention relates to a laminated core and an electric motor.

This application claims priority to Patent Application (Japan) No. 2018-235860, filed December 17, 2018, the contents of which are incorporated herein by reference.

Prerequisites for creating the invention

Traditionally, laminated cores are known as those described in the following Patent Documents 1 and 2. In these laminated cores, electrical steel sheets next to each other in the laying direction are glued together by an adhesive layer.

List of bibliographic references

Patent documents.

Patent document 1.

Unexamined patent application (Japan), first publication No. 2006-288114.

Patent document 2.

Unexamined patent application (Japan), first publication No. 2016-171652.

The essence of the invention

Problems solved by the invention.

In the traditional laminated core, there is room for improvement in terms of the performance of the electric motor, such as the presence of slight vibration and noise when the laminated core constitutes the electric motor.

The present invention has been made in view of the above circumstances and its object is to improve the performance of an electric motor.

Problem solving tool.

To solve the above problems, the present invention provides the following means.

(1) The first aspect of the present invention is a laminated core including a plurality of electrical steel sheets stacked on top of each other, and an adhesive portion provided between the electrical steel sheets adjacent to each other in the laying direction and configured to adhere the electrical steel sheets to each other, wherein the adhesive portion partially glues the electrical steel sheets adjacent to each other in the laying direction, and the adhesive portions adjacent to each other in the laying direction have different placement areas when viewed from above when viewed in the laying direction.

Here, in the adhesive portions adjacent to each other in the laying direction, the fact that the placement areas are different from each other when viewed from above when viewed in the laying direction means that one of the adhesive portions adjacent to each other in the laying direction and the other is not overlap generally when viewed from above when viewed in the direction of installation.

With this configuration, compared with the case in which the placement areas of the adhesive portions adjacent to each other in the laying direction overlap each other when viewed from above when viewed in the laying direction, the least common multiple of the adhesive portion adjacent to the predetermined adhesive portion in the laying direction and the adhesive portions adjacent to the predetermined adhesive portion in the circumferential direction becomes large. Consequently, the resonant frequency of the laminated core may increase. As a result, it is possible to prevent the resonant frequencies of the electric motor and the laminated core from matching. Therefore, the laminated core is less likely to vibrate, and the motor performance of the laminated core can be improved.

(2) The laminated core described in (1), the electrical steel sheet may include an annular core back portion and a plurality of tooth portions that protrude from the core back portion in a radial direction and are spaced at intervals in the circumferential direction of the core back portion; and adhesive portions may be provided on at least one of a laying surface of the core back portion and a laying surface of the tooth portion.

Typically, the adhesive material shrinks as it cures. Consequently, compressive stress is applied to the electrical steel sheet as the adhesive material cures. When compressive mechanical stress is applied, the electrical steel sheet becomes tensioned.

With this configuration, the size of the area in which the adhesive portion is provided is reduced compared to the case in which the adhesive portion is provided over the entire surface for the laying surface of the electrical steel sheet. Therefore, the amount of tension applied to the electrical steel sheet by the adhesive portion is reduced. Therefore, deterioration of the magnetic properties of the laminated core can be limited.

(3) In the laminated core described in (1) or (2), in the adhesive portions, the placement areas may overlap each other at N-layer intervals (N is a prime number) when viewed from above when viewed in the laying direction.

With this configuration, for example, when viewed from above when viewed in the laying direction, on

- 1 044446 the tension formed in the electrical steel sheet becomes uniform in the laying direction, in contrast to the case in which the placement areas of the adhesive parts overlap each other in the laying direction at variable intervals. Therefore, it is possible to limit the displacement of the tension formed in the electrical steel sheet due to the curing of the adhesive material in the laminated core as a whole.

(4) In the laminated core described in (3), N may be equal to 1.

With this configuration, N is 1 and the placement areas overlap each other at one-layer intervals. Therefore, it is possible to limit the local concentration of electrical steel sheets joined by gluing on a portion of the laminated core in the laying direction. Therefore, electrical steel sheets joined by gluing can be distributed in the laying direction. Therefore, it is possible to prevent the resonant frequencies of the electric motor and the laminated core from coinciding. As a result, the performance of the laminated core motor can be further improved.

(5) In the laminated core described in (3), N may be a prime number.

With this configuration, since the number of divisors N, which is a prime number, is small, the least common multiple of the adhesive portion adjacent to the predetermined adhesive portion in the stacking direction and the adhesive portion adjacent to the predetermined adhesive portion in the circumferential direction becomes large. Consequently, the resonant frequency of the laminated core may increase. As a result, it is possible to prevent the resonant frequencies of the electric motor and the laminated core from matching. Therefore, the performance of the laminated core in the electric motor can be further improved.

(6) In the laminated core described in any of (1) to (5), the laying surface of the electrical steel sheet located at one end in the stacking direction of a plurality of electrical steel sheets can be completely adhered to the laying surface of the electrical steel sheet next to it in the direction of installation; and the laying surface of the electrical steel sheet located at the other end in the stacking direction of the plurality of electrical steel sheets can be completely adhered to the laying surface of the electrical steel sheet adjacent thereto in the stacking direction.

With this configuration, separation of the electrical steel sheet laying surface located at one end in the laying direction and the electrical steel sheet laying surface next to this surface in the laying direction of the electrical steel sheets from each other in the laying direction is limited at both the outer circumferential edge and and in the central area of the surface. Therefore, it is possible to limit the generation of vibration between surfaces adjacent to each other in the laying direction.

Likewise, in the electrical steel sheet located at the other end in the laying direction of the electrical steel sheets, it is also possible to limit the generation of vibration between surfaces adjacent to each other in the laying direction.

(7) In the laminated core described in any of (1) to (6), the average thickness of the adhesive parts may be 1.0-3.0 µm.

(8) In the laminated core described in any of (1) to (7), the average tensile modulus E of the adhesive parts may be 1500-4500 MPa.

(9) In the laminated core described in any of (1) to (8), the adhesive portion may be a room temperature adhesive acrylic-based adhesive material containing SGA made of an elastomer-containing acrylic-based adhesive material.

(9) The second aspect of the present invention is an electric motor including a laminated core described in any of (1) to (9).

According to such a configuration, it is possible to improve the performance of the electric motor.

Advantages of the invention

According to the present invention, it is possible to improve the performance of an electric motor.

Brief description of drawings

Fig. 1 is a sectional view of an electric motor according to an embodiment of the present invention.

Fig. 2 is a top view of a stator included in the electric motor shown in FIG. 1.

Fig. 3 is a perspective view of a laminated core according to an embodiment of the present invention.

Fig. 4 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=1).

Fig. 5 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=1).

Fig. 6 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=1).

Fig. 7 is a top view of an electrical steel sheet constituting a laminated sulfur

- 2 044446 day boy according to an embodiment of the present invention (in the case of N=1).

Fig. 8 is a perspective view of a laminated core according to an embodiment of the present invention.

Fig. 9 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=2).

Fig. 10 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=2).

Fig. 11 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=2).

Fig. 12 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=7).

Fig. 13 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=7).

Fig. 14 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=7).

Fig. 15 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=7).

Fig. 16 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=7).

Fig. 17 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=7).

Fig. 18 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=7).

Fig. 19 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=7).

Fig. 20 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=7).

Fig. 21 is a plan view of an electrical steel sheet constituting a laminated core according to an embodiment of the present invention (in the case of N=7).

Embodiments for implementing the invention

Hereinafter, this document will describe a laminated core and an electric motor according to an embodiment of the present invention with reference to the drawings.

In the present embodiment, an electric motor, specifically an AC electric motor, is further illustrated as an example of an electric motor. The AC motor is more specifically a synchronous motor, and even more specifically a permanent magnet motor. This type of electric motor is suitably used for example in an electric vehicle.

As shown in FIG. 1, the electric motor 10 includes a stator 20, a rotor 30, a housing 50, and a rotation shaft 60. The stator 20 and the rotor 30 are housed in the housing 50. The stator 20 is attached to the housing 50.

In the present embodiment, as the electric motor 10, an internal rotor electric motor is used, in which the rotor 30 is located in the stator 20. However, as the electric motor 10, an external rotor electric motor, in which the rotor 30 is located outside the stator 20, can be used. Additionally, in the present embodiment, the motor 10 is a three-phase AC motor with 12 poles and 18 slots. However, for example, the number of poles, the number of slots, the number of phases, etc. can be changed accordingly.

The stator 20 includes a stator core 21 and a winding (not shown).

The stator core 21 includes an annular core back portion 22 and a plurality of tooth portions 23. Hereinafter, the axial direction (the direction of the central axis O of the stator core 21) of the stator core 21 (the core back portion 22) is called the axial direction, the radial direction (the direction orthogonal to the central axis O of the stator core 21) of the stator core 21 (core back portion 22) is called the radial direction, and the circumferential direction (the direction of rotation about the central axis O of the stator core 21) of the stator core 21 (core back portion 22) is called the circumferential direction.

The core back portion 22 is formed in an annular shape when viewed from above the stator 20 when viewed in the axial direction.

A plurality of tooth portions 23 protrude from the core back portion 22 inward in the radial direction (towards the central axis O of the core back portion 22 in the radial direction). A plurality of tooth portions 23 are arranged at equal intervals in the circumferential direction. In the present embodiment, 18 tooth portions 23 are provided at intervals of 20 degrees of a central angle centered on the central axis O. A plurality of tooth portions 23 are formed as possible

- 3 044446 to have an identical shape and identical size to each other.

The winding is wound around the tooth portion 23. The winding may be a concentrated winding or a distributed winding.

The rotor 30 is located in 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 configured to have an annular shape (enclosing ring) positioned coaxially with the stator 20. The rotation shaft 60 is located in the rotor core 31. The rotary shaft 60 is attached to the rotor core 31.

A plurality of permanent magnets 32 are attached to the rotor core 31. In the present embodiment, a set of two permanent magnets 32 forms one magnetic pole. A plurality of sets of permanent magnets 32 are arranged at equal intervals in the circumferential direction. In the present embodiment, 12 sets (24 in total) of permanent magnets 32 are provided at intervals of 30 degrees of a central angle centered on the central axis O.

In the present embodiment, the internal permanent magnet motor is used as a permanent magnet excited motor.

A plurality of through holes 33 that extend through the rotor core 31 in the axial direction are formed in the rotor core 31. A plurality of through holes 33 are provided according to a plurality of permanent magnets 32. Each of the permanent magnets 32 is attached to the rotor core 31 in a state in which it is located in a corresponding through hole 33. Each of the permanent magnets 32 is attached to the rotor core 31, for example, by gluing an outer surface of the permanent magnet 32 and the inner surface of the through hole 33 with an adhesive material or the like. As a permanent magnet motor, a surface permanent magnet motor can be used instead of an internal permanent magnet motor.

Both the stator core 21 and the rotor core 31 are laminated cores. The laminated core is formed by laying down a plurality of electrical steel sheets 40.

The stacking thickness 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, for example, is 250.0 mm. The inner diameter of the stator core 21, for example, is 165.0 mm. The outer diameter of the rotor core 31, for example, is 163.0 mm. The inner diameter of the rotor core 31, for example, is 30.0 mm. However, these values are examples, and the stacking thickness, outer diameter and inner diameter of the stator core 21 and the stacking 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 end portion of the tooth portion 23 of the stator core 21. The inner diameter of the stator core 21 is the diameter of a virtual circle inscribed in the end portions of the top of all tooth parts 23.

Each of the electrical steel sheets 40 forming the stator core 21 and the rotor core 31 is formed, for example, by punching out an electrical steel sheet as a base material. As the electrical steel sheet 40, a known electrical steel sheet may be used. The chemical composition of the electrical steel sheet 40 is not particularly limited. In the present embodiment, an electrical steel sheet without grain oriented is used as the electrical steel sheet 40. As the non-grain oriented electrical steel sheet, for example, non-grain oriented electrical steel strip of JIS according to C 2552:2014 can be used.

However, as the electrical steel sheet 40, it is also possible to adopt a grain-oriented electrical steel sheet instead of a non-grain-oriented electrical steel sheet. As the grain-oriented electrical steel sheet, for example, grain-oriented electrical steel strip according to JIS C 2553:2012 can be used.

Insulating coatings are provided on both surfaces of the electrical steel sheet 40 to improve the workability of the electrical steel sheet and the loss of the laminated core steel. For example, (1) an inorganic compound, (2) an organic polymer, (3) a mixture of an inorganic compound and an organic polymer, etc. can be applied as a substance constituting an insulating coating. Examples of the inorganic compound include (1) a dichromate-boric acid complex, (2) a phosphate-silica complex, and the like. Examples of the organic polymer include epoxy resin, acrylic resin, acrylic resin, polyester resin, silicone resin and fluoride resin and the like.

To ensure insulating performance between the electrical steel sheets 40 stacked on top of each other, the thickness of the insulating coating (thickness per surface of the electrical steel sheet 40) is preferably 0.1 μm or more.

On the other hand, the insulating capacity saturates as the insulating coating becomes thicker. Additionally, as the insulating coating becomes

- 4 044446 thicker, the fill factor decreases, and the performance as a laminated core deteriorates. Therefore, the insulating coating should be as thin as possible within the range within which insulating performance is achieved. The thickness of the insulating coating (thickness per surface of the electrical steel sheet 40) is preferably 0.1 μm or more and 5 μm or less. The thickness of the insulating coating is more preferably 0.1 μm or more and 2 μm or less.

As the electrical steel sheet 40 becomes thinner, the steel loss improving effect gradually becomes saturated. Additionally, as the electrical steel sheet 40 becomes thinner, the cost of manufacturing the electrical steel sheet 40 increases. Therefore, the thickness of the electrical steel sheet 40 is preferably 0.10 mm or more in view of the effect of improving steel loss and manufacturing cost.

On the other hand, when the electrical steel sheet 40 is too thick, the pressing punching operation of the electrical steel sheet 40 becomes difficult.

Therefore, considering the pressing punching operation of the electrical steel sheet 40, the thickness of the electrical steel sheet 40 is preferably 0.65 mm or less.

Additionally, as the electrical steel sheet 40 becomes thick, steel loss increases. Therefore, in view of the steel loss characteristics of the electrical steel sheet 40, the thickness of the electrical steel sheet 40 is preferably 0.35 mm or less. The thickness of the electrical steel sheet 40 is more preferably 0.20 mm or 0.25 mm.

Considering the above aspects, the thickness of each of the electrical steel sheets 40 is, for example, 0.10 mm or more and 0.65 mm or less. The thickness of each of the electrical steel sheets 40 is preferably 0.10 mm or more and 0.35 mm or less, and more preferably 0.20 mm or 0.25 mm. The thickness of the electrical steel sheet 40 includes the thickness of the insulating coating.

As shown in FIG. 3, a plurality of electrical steel sheets 40 forming the stator core 21 are stacked on top of each other in the thickness direction. The thickness direction is the thickness direction of the electrical steel sheet 40. The thickness direction corresponds to the laying direction of the electrical steel sheets 40. In fig. 3, for convenience, the tooth portion 23 is not shown. A plurality of electrical steel sheets 40 are arranged coaxially with respect to the central axis O. The electrical steel sheet 40 includes a core back portion 22 and a plurality of tooth portions 23.

In the stator core 21, as shown in FIG. 4 and 5, the adhesive portion 41 for gluing the electrical steel sheets 40 is disposed between the electrical steel sheets 40 adjacent to each other in the stacking direction.

The adhesive portion 41 partially glues the electrical steel sheets 40 next to each other in the stacking direction. The adhesive portions 41 next to each other in the laying direction have different placement areas in a top view when viewed in the laying direction. The range in which the adhesive parts 41 adjacent to each other in the laying direction are arranged such that their placement areas differ from each other when viewed from above when viewed in the laying direction (hereinafter referred to as the placement range in which the placement areas differ from each other) from each other), may be a stator core 21 and may form part of a stator core 21. Specifically, the placement range in which the placement areas are different from each other may be in one of a plurality of tooth portions 23 placed in the circumferential direction. The placement range in which the placement areas are different from each other may be in one of the layers formed by a plurality of adhesive parts 41, which are described below, placed in the laying direction.

Here, the placement area is an area on the surface 40a (first surface) of the electrical steel sheet 40 on which the adhesive portion 41 is provided. Thus, the placement area is a bonding area on the surface 40a of the electrical steel sheet 40 on which the adhesive portion 41 is provided. A bonding region in which the adhesive portion 41 is provided and a non-bonding region in which the adhesive portion 41 is not provided are formed on the surface 40a of the electrical steel sheet 40.

The bonding region of the electrical steel sheet 40 in which the adhesive portion 41 is provided means the region of the first surface of the electrical steel sheet 40 in which the separation-free curing adhesive material is provided.

Additionally, the non-adhering region of the electrical steel sheet 40 in which the adhesive portion 41 is not provided means the region of the first surface 40a of the electrical steel sheet 40 in which the adhesive material that is cured without separation is not provided.

Here, the adhesive material that is cured without separation between the electrical steel sheets 40 adjacent to each other in the laying direction is called a single adhesive portion 41.

Here, as shown in FIG. 2, 4 and 5, the laying surface of the core back portion 22 is called surface 22a. The laying surface of the tooth portion 23 is called surface 23a. At this time

- 5 044446 me, the adhesive part 41 is preferably provided on at least one of the surface 22a of the core back part 22 and the surface 23a of the tooth part 23 in the electrical steel sheet 40. Thus, the adhesive portion 41 can only be provided on the surface 22a of the core back portion 22 in the electrical steel sheet 40. The adhesive portion 41 may be provided only on the surface 23a of the tooth portion 23 in the electrical steel sheet 40. The adhesive portion 41 may be provided on both the surface 22a of the core back portion 22 and the surface 23a of the tooth portion 23 in the electrical steel sheet 40.

In the present embodiment, one or a plurality of adhesive portions 41 may form a layer (hereinafter herein also referred to as a layer formed by the adhesive portions 41) between two electrical steel sheets 40. In other words, the layer formed by the adhesive portion 41 includes one or a plurality of adhesive portions 41. The plurality of layers formed by the adhesive portion 41 are provided in the laying direction.

Preferably, the adhesive portion 41 is provided such that the placement areas overlap at N-ply intervals (N is a prime number) in a plan view when viewed in the laying direction. N-layer spacing means N-layer spacing in layers by the adhesive portion 41. In other words, preferably, each of the adhesive portions 41 is located at an identical position in the electrical steel sheet 40 with N-layer spacing (N is a prime number) in the layers formed by the adhesive portion 41. When viewed from above, when viewed in the laying direction, preferably, the placement areas of the adhesive portion 41 overlap at N-layer intervals along the entire length of the stator core 21 in the laying direction.

The fact that the placement areas of the adhesive part 41 overlap with N-layer spacing in the top view when viewed in the laying direction means that the placement areas of the adhesive part 41 overlap with N-layer spacing in the top view when viewed in the laying direction of at least at least some layers formed by a plurality of adhesive portions 41 disposed in the laying direction in one of the plurality of tooth portions 23 disposed in the circumferential direction.

Additionally, N is preferably 1 or a prime number. In the present embodiment, N=1.

In the present embodiment, a case is shown in which the adhesive portion 41 is provided only on the surface 23a of the tooth portion 23. Hereinafter, the plurality of tooth portions 23 included in each of the electrical steel sheets 40 are also referred to as tooth portions 23A to 23R in clockwise order as shown in Fig. 4 and 5. A plurality of electrical steel sheets 40 included in the stator core 21 are also called electrical steel sheets 400, 40A, 40B, ..., in order from the first side in the laying direction to the second side opposite the first side in the laying direction ( see Fig. 8). The adhesive portions 41 are located at positions adjacent to the first side in the laying direction relative to the electrical steel sheets 40A, 40B, . . . . The adhesive portion 41 is not located at a position adjacent to the first side in the laying direction relative to the electrical steel sheet 400. The adhesive portion 41 is located at a position adjacent to the second side in the laying direction relative to the electrical steel sheet 400.

Hereinafter, the adhesive portion 41 located (provided) on the electrical steel sheet 40 means the adhesive portion 41 located at a position adjacent to the first side in the laying direction relative to the electrical steel sheet 40.

The tooth portions 23A of the electrical steel sheets 40 overlap each other in a top view when viewed in the laying direction. The same applies to the tooth portions 23B to 23R of each of the electrical steel sheets 40.

When N=1, as shown in FIG. 4, in the electrical steel sheet 40A, an adhesive portion 41 is provided on the surface 23a of each of the tooth portions 23A, 23C, 23E, 23G, 23I, 23K, 23M, 23O and 23Q. Additionally, as shown in FIG. 5, in the electrical steel sheet 40B adjacent to the electrical steel sheet 40A in the laying direction, an adhesive portion 41 is provided on the surface 23a of each of the tooth portions 23B, 23D, 23F, 23H, 23J, 23L, 23N, 23P and 23R. Each of the adhesive portions 41 is strip-shaped when viewed from above and is located along the outer portion of the tooth portion 23.

A placement pattern of the other adhesive portion 41 in the stator core 21 is approximately illustrated.

As shown in FIG. 6 and 7, in this example, 18 tooth parts 23 (23A-23R) are provided at intervals of 20 degrees of a central angle centered on the central axis O.

In the electrical steel sheet 40A, each of the adhesive portions 41 extends from the surface 23a of each of the tooth portions 23A, 23C, 23E, 23G, 23I, 23K, 23M, 23O, and 23Q into the outer circumferential edge of the core back portion 22 in a radial direction along the tooth portions. 23. In the electrical steel sheet 40B, each of the adhesive portions 41 extends from the surface 23a of each of the tooth portions 23B, 23D, 23F, 23H, 23J, 23L, 23N, 23P and 23R into the outer circumferential edge of the core back portion 22 in a radial direction along 23 tooth parts.

Additionally, as shown in FIG. 8, there are 21 stator cores of this example, 11 sheets 40 (400

- 6 044446

40J) electrical steel are stacked on top of each other. Below, for ease of explanation, a stator core 21 including 11 electrical steel sheets 40 is described as an example. However, the stator core 21 may include 12 or more electrical steel sheets 40.

The case of the stator core 21 in which N=1 is shown in FIG. 6 and 7 and in table. 1. In this case, the adhesive portions 41 are provided such that the placement areas overlap at a single-layer interval in a plan view when viewed in the laying direction. In Table 1, the portion marked with o (the column in which o is described) indicates the outer portion (hereinafter referred to as the outer core back portion of the tooth portion 23 in this document) of the tooth portion 23 in the radial direction in (1) the tooth portion 23 , on which the adhesive portion 41 is disposed, and (2) the core back portion 22, on which the adhesive portion 41 is disposed. Hereinafter, the serrated portion 23 and the outer core back portion of the serrated portion 23 are also referred to as the serrated portion 23 and the like.

According to the column describing o, the adhesive portion 41 can only be located on one of the tooth portion 23 and the outer core back portion of the tooth portion 23.

The stator core 21 of this example includes an electrical steel sheet 400. However, as described below, since the adhesive portion 41 is not located on the electrical steel sheet 400, the electrical steel sheet 400 is not shown in the table. 1. Also in Tables 2 to 5, which is described below, the electrical steel sheet 400 is not shown in each of the tables.

For example, in table. 1, o is shown in the column of the tooth portion 23A of the electrical steel sheet 40A. This description means that the adhesive portion 41 is located at a position adjacent to the first side in the laying direction relative to the tooth portion 23A of the electrical steel sheet 40A. This description further means that the adhesive portion 41 is located at a position adjacent to the first side in the laying direction relative to the outer core back portion of the tooth portion 23A of the electrical steel sheet 40A. Hereinafter in this document, the layer formed by the adhesive portion 41 located on the first side in the laying direction relative to the electrical steel sheet 40A is called the layer formed by the adhesive portion 41 corresponding to the electrical steel sheet 40A. The same applies to 40B-40J electrical steel sheets.

On the other hand, o is not described in the column of the tooth portion 23A of the electrical steel sheet 40B. This description means that the adhesive portion 41 is not located at a position adjacent to the first side in the laying direction relative to the tooth portion 23A of the electrical steel sheet 40B. This description further means that the adhesive portion 41 is not located at a position adjacent to the first side in the laying direction relative to the outer core back portion of the tooth portion 23A of the electrical steel sheet 40B.

In the case of the stator core 21 in which N=1, as shown in FIG. 6 and in table. 1, in electrical steel sheets 40A, 40C, 40E, 40G and 40I, an adhesive portion 41 is provided on the surface 23a of each of the first group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each of the first group tooth portions 23 in parts 22 of the back of the core. The tooth portions 23 of the first group mentioned herein mean the tooth portions 23A, 23C, 23E, 23G, 23I, 23K, 23M, 23O and 23Q.

Additionally, as shown in FIG. 7 and in table. 1, in the electrical steel sheets 40B, 40D, 40F, 40H and 40J, an adhesive portion 41 is provided on the surface 23a of each of the second group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each of the second group tooth portions 23 in parts 22 of the back of the core. The tooth portions 23 of the second group mentioned herein mean the tooth portions 23B, 23D, 23f, 23H, 23J, 23L, 23N, 23P, and 23R.

In this example, two types of layers formed by the adhesive portions 41 having different shapes when viewed from above are provided in the stator core 21. The layers formed by the two types of adhesive portions 41 correspond to the tooth portions 23 of the first group and the tooth portions 23 of the second group. Here, of the layers formed by the two types of adhesive portions 41, the layers formed by the adhesive portions 41 having different shapes in the top view are referred to as the layer formed by the first type of adhesive portion 41 and the layer formed by the second type of adhesive portion 41.

In all layers formed by two types of adhesive portions 41, the adhesive portions 41 are disposed on the tooth portions 23 and the like. at intervals of one tooth portion 23 in the circumferential direction.

However, for example, when the adhesive portion 41 is located on the tooth portion 23A and the like. in the layer formed by the first type of adhesive portion 41, the adhesive portion 41 is not located on the tooth portion 23A and the like. in the layer formed by the second type of adhesive portion 41. On the other hand, when the adhesive portion 41 is not located on the tooth portion 23 A and the like. in the layer formed by the first type of adhesive portion 41, the adhesive portion 41 is located on the tooth portion 23A and the like. layer formed by the second type of adhesive portion 41. The same applies to the tooth portions 23B to 23R.

- 7 044446

Then, the layers formed by the two types of adhesive parts 41 are alternately arranged in the laying direction. In other words, the shapes of the layers formed by the adhesive portion 41 when viewed from above are identical at single-layer intervals.

When 12 or more electrical steel sheets 40 are stacked on top of each other (provided) in the stator core 21, the stator core 21 has the following configuration. Thus, another electrical steel sheet 40A is laid adjacent to the electrical steel sheet 40J (at a position adjacent to the second side in the laying direction relative to the electrical steel sheet 40J). Hereinafter in this document, other electrical steel sheets 40E to 40J are placed on top of each other in this order at positions adjacent to the second side in the laying direction.

The case of the stator core 21 in which N=2 (prime number) is shown in FIG. 9-11 and in table. 2. In this case, the adhesive portion 41 is provided such that the placement areas overlap at two-layer intervals in a plan view when viewed in the laying direction. In table 2, the portion marked with o indicates the serrated portion 23 on which the adhesive portion 41 is located, and the outer portion of the serrated portion 23 in the radial direction in the core back portion 22 (serrated portion 23, etc.).

In the case of the stator core 21 in which N=2 (prime number), as shown in FIG. 9 and in table. 2, in the electrical steel sheets 40A, 40D, 40G and 40J, an adhesive portion 41 is provided on the surface 23a of each of the sixth group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each sixth group tooth portion 23 in the portion 22 back of the core. The tooth portions 23 of the sixth group mentioned herein mean the tooth portions 23A, 23D, 23G, 23J, 23M and 23P.

Additionally, as shown in FIG. 10 and in table. 2, in the electrical steel sheets 40B, 40E and 40H, the adhesive portion 41 is provided on the surface 23a of each of the seventh group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each seventh group tooth portion 23 in the core back portion 22. The tooth portions 23 of the seventh group referred to herein mean the tooth portions 23B, 23E, 23H, 23K, 23N and 23Q.

Additionally, as shown in FIG. 11 and in table. 2, in the electrical steel sheets 40C, 40F and 40I, an adhesive portion 41 is provided on the surface 23a of each of the eighth group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each eighth group tooth portion 23 in the core back portion 22. The tooth portions 23 of the eighth group referred to herein mean the tooth portions 23C, 23F, 23I, 23L, 230 and 23R.

In this example, three types of layers formed by the adhesive portions 41 having different shapes when viewed from above are provided in the stator core 21. The layers formed by the three types of adhesive portions 41 correspond to the tooth portions 23 of the sixth group, the tooth portions 23 of the seventh group, and the tooth portions 23 of the eighth group.

In all layers formed by three types of adhesive portions 41, the adhesive portions 41 are disposed on the tooth portions 23 and the like. with an interval of two tooth parts 23 in the circumferential direction. Here, of the layers formed by the three types of adhesive portions 41, the layers formed by the adhesive portions 41 having different shapes when viewed from above are called the layer formed by the first type of adhesive portion 41, the layer formed by the second type of adhesive portion 41, and the layer formed by the second type of adhesive portion 41.

The tooth portion 23 or the like on which the adhesive portion 41 is located in the layer formed by the second type of adhesive portion 41 is shifted to the first side by one tooth portion 23 or the like. in the circumferential direction relative to the tooth part 23, etc., on which the adhesive part is located

- 8 044446 in the layer formed by the first type of adhesive portion 41. The serrated portion 23 and the like on which the adhesive portion 41 is located in the layer formed by the third type of adhesive portion 41 is shifted to the first side by one serrated portion 23 and etc. in the circumferential direction relative to the tooth portion 23 and the like on which the adhesive portion 41 is disposed in the layer formed by the second type of adhesive portion 41.

Then, the layer by the first type of adhesive portion 41, the layer by the second type of adhesive portion 41, and the layer by the third type of adhesive portion 41 are arranged in order from the first side to the second side in the laying direction. In other words, the shapes of the layers formed by the adhesive portion 41 when viewed from above are identical at two-layer intervals.

When 12 or more electrical steel sheets 40 are stacked on top of each other in the stator core 21, the stator core 21 has the following configuration. Thus, another electrical steel sheet 40A is laid adjacent to the electrical steel sheet 40J. Hereinafter, hereinafter, other electrical steel sheets 40B to 40J are placed on top of each other in this order at positions adjacent to the second side in the laying direction relative to the other electrical steel sheet 40A.

However, when another electrical steel sheet 40A is laid adjacent to the electrical steel sheet 40J, the other electrical steel sheet 40A is positioned in a state in which it rotates about the central axis O relative to the electrical steel sheet 40J such that the tooth portion 23C of the other electrical steel sheet 40A electrical steel overlaps the tooth portion 23A of the electrical steel sheet 40J.

table 2

23 A 23 IN 23 WITH 23 D 23 E 23 F 23 G 23 N 23 I 23 J 23 TO 23 L 23 M 23 N 23 ABOUT 23 R 23 Q 23 R 40A O O O O O O 40V O O O O O O 40C O O O O O O 40D O O O O O O 40E O O O O O O 40F O O O O O O 40G O O O O O O 40N O O O O O O 401 O O O O O O 40J O O O O O O

The case of the stator core 21 in which N=7 (prime number) is shown in FIG. 12-21 and in table. 3. In this case, in some of the tooth portions 23 of the plurality of tooth portions 23 placed in the circumferential direction, the adhesive portions 41 are provided such that the placement areas overlap at seven-layer intervals in a plan view when viewed in the laying direction. In table 3, the portion marked with o indicates the serrated portion 23 on which the adhesive portion 41 is disposed, and the outer portion of the serrated portion 23 in the radial direction in the core back portion 22 on which the adhesive portion 41 is disposed (prong portion 23, etc. .).

When N=7 (prime number), as shown in FIG. 12 and in table. 3, in the electrical steel sheets 40A and 40I, the adhesive portion 41 is provided on the surface 23a of each of the eleventh group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each of the eleventh group tooth portions 23 in the core back portion 22. The tooth portions 23 of the eleventh group referred to herein mean the tooth portions 23A, 23I and 23Q.

Additionally, as shown in FIG. 13 and in table. 3, in the electrical steel sheets 40B and 40J, an adhesive portion 41 is provided on the surface 23a of each of the twelfth group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each of the twelfth group tooth portions 23 in the core back portion 22. The tooth portions 23 of the eleventh group referred to herein mean the tooth portions 23B, 23J and 23R.

Additionally, as shown in FIG. 14 and in table. 3, in the electrical steel sheet 40C, an adhesive portion 41 is provided on the surface 23a of each of the thirteenth group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each of the thirteenth group tooth portions 23 in the core back portion 22. The tooth portions 23 of the thirteenth group referred to herein mean the tooth portions 23C and 23K.

Additionally, as shown in FIG. 15 and in table. 3, in the electrical steel sheet 40D, an adhesive portion 41 is provided on the surface 23a of each of the fourteenth group tooth parts 23, which is described below, and on the surface 22a of the radial outer portion of each of the tooth parts.

- 9 044446 tey 23 of the fourteenth group in part 22 of the back of the core. The tooth portions 23 of the fourteenth group referred to herein mean the tooth portions 23D and 23L.

Additionally, as shown in FIG. 16 and in table. 3, in the electrical steel sheet 40E, an adhesive portion 41 is provided on the surface 23a of each of the fifteenth group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each of the fifteenth group tooth portions 23 in the core back portion 22. The tooth portions 23 of the fifteenth group referred to herein mean the tooth portions 23E and 23M.

Additionally, as shown in FIG. 17 and in table. 3, in the electrical steel sheet 40F, an adhesive portion 41 is provided on the surface 23a of each of the sixteenth group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each of the sixteenth group tooth portions 23 in the core back portion 22. The tooth portions 23 of the sixteenth group referred to herein mean the tooth portions 23F and 23N.

Additionally, as shown in FIG. 18 and in table. 3, in the electrical steel sheet 40G, the adhesive portion 41 is provided on the surface 23a of each of the seventeenth group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each of the seventeenth group tooth portions 23 in the core back portion 22. The tooth portions 23 of the seventeenth group mentioned herein mean the tooth portions 23G and 230.

Additionally, as shown in FIG. 19 and in table. 3, in the electrical steel sheet 40H, an adhesive portion 41 is provided on the surface 23a of each of the eighteenth group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each of the eighteenth group tooth portions 23 in the core back portion 22. The tooth portions 23 of the eighteenth group mentioned herein mean the tooth portions 23H and 23P.

Additionally, as shown in FIG. 20 and in table. 3, in the electrical steel sheet 40I, an adhesive portion 41 is provided on the surface 23a of each of the nineteenth group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each of the nineteenth group tooth portions 23 in the core back portion 22. The tooth portions 23 of the nineteenth group referred to herein mean the tooth portions 23I and 23Q.

Additionally, as shown in FIG. 21 and in table. 3, in the electrical steel sheet 40G, an adhesive portion 41 is provided on the surface 23a of each of the twentieth group tooth portions 23, which is described below, and on the surface 22a of the radial outer portion of each of the twentieth group tooth portions 23 in the core back portion 22. The tooth portions 23 of the twentieth group referred to herein mean the tooth portions 23J and 23R.

In this example, 10 types of layers formed by the adhesive portions 41 having different shapes when viewed from above are provided in the stator core 21. The layers formed by the 10 types of adhesive portions 41 correspond to the eleventh group tooth portions 23 to the twentieth group tooth portions 23. In all layers formed by the 10 types of adhesive portions 41, the adhesive portions 41 are disposed on the tooth portions 23 and the like. at intervals of one, seven or nine tooth parts 23 in the circumferential direction.

The difference between the tooth portions 23 in which the adhesive portions 41 are provided between layers by 10 types of adhesive portions 41 is identical in the case of N=1 and 2, and description thereof will be omitted.

When 12 or more electrical steel sheets 40 are stacked on top of each other in the stator core 21, the stator core 21 has the following configuration. Thus, another electrical steel sheet 40A is laid adjacent to the electrical steel sheet 40J. Hereinafter, hereinafter, other electrical steel sheets 40B to 40J are placed on top of each other in this order at positions adjacent to the second side in the laying direction relative to the other electrical steel sheet 40A.

However, when another electrical steel sheet 40A is laid adjacent to the electrical steel sheet 40J, the other electrical steel sheet 40A is positioned in a state in which it rotates about the central axis O relative to the electrical steel sheet 40J such that the tooth portion 23K of the other electrical steel sheet 40A electrical steel overlaps the tooth portion 23A of the electrical steel sheet 40J.

- 10 044446

Hereinafter, a modified example in the case of a stator core 21 in which N=7 is described with reference to Table. 4.

In the stator core 21 of this modified example, in addition to the configuration of the stator core 21 shown in the example of Table. 3, the adhesive parts 41 are located at the following two locations. Specifically, the adhesive portions 41 are respectively located on the tooth portion 23 A and the like. electrical steel sheet 40I and tooth part 23B, etc. 40J electrical steel sheet.

When 12 or more electrical steel sheets 40 are stacked on top of each other in the stator core 21 of the modified example, they are substantially stacked on top of each other in the same manner as in the stator core 21 shown in the example of Table 1. 3. However, when the other electrical steel sheet 40A is laid adjacent to the electrical steel sheet 40J, the other electrical steel sheet 40A is positioned in a state in which it rotates about the central axis O relative to the electrical steel sheet 40J such that the tooth portion 23G of the other The electrical steel sheet 40A overlaps the tooth portion 23A of the electrical steel sheet 40J.

Here, it can be said that the stator core 21 shown in the above-described examples of Tables 1 and 2 has the following first and second configurations associated with the adhesive portion 41.

First configuration: a configuration in which the adhesive portions 41 are arranged at equal intervals in the laying direction (at intervals of an equal number of layers in the laying direction) along the entire length of the stator core 21 in the laying direction in one of a plurality of tooth portions 23 arranged in the circumferential direction.

Second configuration: a configuration in which the adhesive portions 41 are arranged at equal intervals in the circumferential direction (at intervals of an equal number of tooth portions 23 in the circumferential direction) around the entire circumference of the stator core 21 in one of the layers formed by a plurality of adhesive portions 41 arranged in laying direction.

For example, in the stator core 21 shown in the example table. 3, when the number of electrical steel sheets 40 included in the stator core 21 is larger (for example, when 21 electrical steel sheets 40 are provided), the stator core 21 may have the first configuration. In this case, the electrical steel sheets 40 after the twelfth electrical steel sheet 40 are stacked on top of each other as described above.

- 11 044446

In order to analyze the first configuration and the second configuration in detail, the first interval and the second interval are re-set. The first interval is an interval specified for each of the tooth portions 23A to 23R of the electrical steel sheet 40. The second interval is an interval specified for each of the layers by each of the adhesive portions 41.

The first interval is an interval indicating how many layers the adhesive portions 41, in which the placement areas overlap each other when viewed in the laying direction, are separated from each other in the target tooth portions 23. For example, in Table. 1, attention is drawn to the tooth portion 23A. In the tooth portion 23A, the adhesive portions 41, in which the placement areas overlap each other when viewed in the laying direction, are arranged at single-layer intervals along the entire length of the stator core 21 in the laying direction. Thus, in the tooth portion 23A, the first interval is 1 along the entire length of the stator core 21 in the laying direction.

The second spacing is a spacing indicating how many of the tooth portions 23 on which the adhesive portion 41 is not located are arranged between the circumferential directions of the other adhesive portions 41 adjacent to each other in the circumferential direction in the layer formed by one target adhesive portion 41. For example, in table 1, attention is drawn to the layer formed by the adhesive portion 41 corresponding to the electrical steel sheet 40A. In the layer formed by the adhesive portion 41 corresponding to the electrical steel sheet 40A, one tooth portion 23 is disposed between the circumferential directions of the other adhesive portions 41 adjacent to each other in the circumferential direction around the entire circumference of the stator core 21. Thus, in the layer formed by the adhesive portion 41 corresponding to the electrical steel sheet 40A, the second spacing is 1 around the entire circumference of the stator core 21.

The first configuration and the second configuration may be expressed using the first interval and the second interval as follows.

First configuration: a configuration in which the first intervals are equal to each other along the entire length of the stator core 21 in the direction of laying in one of the plurality of tooth parts 23 arranged in the circumferential direction.

Second configuration: a configuration in which the second intervals are equal to each other around the entire circumference of the stator core 21 in one of the layers formed by a plurality of adhesive portions 41 arranged in the laying direction.

There are 21 stator cores of the example shown in Table. 1, in all tooth parts 23, the first interval is 1 along the entire length of the stator core 21 in the laying direction. In all layers formed by the adhesive portions 41, the second spacing is 1 around the entire circumference of the stator core 21. The stator core 21 includes a first configuration and a second configuration.

There are 21 stator cores of the example shown in Table. 2, in all tooth parts 23, the first interval is 2 along the entire length of the stator core 21 in the laying direction. In all layers formed by the adhesive portions 41, the second spacing is 2 around the entire circumference of the stator core 21. The stator core 21 includes a first configuration and a second configuration.

There are 21 stator cores of the example shown in Table. 3, the first interval is 7 in the tooth portions 23I, 23J, 23Q and 23R. The tooth portions 23 do not have a first configuration since there is only one first interval. The first interval for the tooth portions 23A to 23H and 23K to 23P is not specified because there are no other adhesive portions 41 in which the placement areas overlap each other when viewed in the laying direction. Since the first interval is not specified for these tooth parts 23, the first configuration is not provided.

The second spacings in the layers by the adhesive portions 41 corresponding to the electrical steel sheets 40A and 40B are 7, 7 and 1. The second spacings in the layers by the adhesive portions 41 corresponding to the electrical steel sheets 40C to 40J are 7 and 9. There are 21 stators in the core In this example, all the layers formed by the plurality of adhesive portions 41 do not have a second configuration.

As described above, in the stator core 21 shown in the example table. 3, when the number of electrical steel sheets 40 included in the stator core 21 is greater, the stator core 21 may have a first configuration.

Similar to the stator core 21 of the example shown in Table. 3, the stator core 21 of the example shown in Table 4 does not have the first configuration and the second configuration.

However, the stator core 21 may not have the first configuration and the second configuration, similar to the example of the stator cores 21 shown in Tables 3 and 4. The stator core 21 may not have one of the first configuration and the second configuration, and may not have both of them.

Below, a stator core 21 that does not have the first configuration and the second configuration will be described with reference to Tables 5 and 6.

In the stator core 21 of the examples shown in Tables 5 and 6, 11 electrical steel sheets 40 (400 and 40A-40J) are stacked on top of each other. 400 electrical steel sheet is not shown in the tables.

In table 5 and 6, the portion marked with o indicates the tooth portion 23B and the like on which

- 12 044446 the adhesive part 41 is located.

Instead of the stator core 21 having the first configuration, for example, the following third configuration or fifth configuration may be provided.

Third configuration: a configuration in which the placement areas of the adhesive parts 41 overlap each other at intervals of different prime numbers of layers when viewed from above when viewed in the laying direction in a portion of the stator core 21 region in the laying direction in one of the plurality of tooth parts 23 arranged in the circumferential direction.

In other words, the third configuration is a configuration in which the first intervals next to each other in the laying direction are prime numbers different from each other in a portion of the area of the stator core 21 in the laying direction in one of the plurality of tooth parts 23 arranged in the circumferential direction.

Fifth configuration: a configuration in which the placement areas of the adhesive parts 41 overlap each other at intervals of different prime numbers of layers along the entire length of the stator core 21 in the laying direction when viewed from above in the laying direction, in one of the plurality of tooth parts 23 arranged in the circumferential direction .

In other words, the fifth configuration is a configuration in which the first intervals next to each other in the laying direction are prime numbers different from each other along the entire length of the stator core 21 in the laying direction in one of the plurality of tooth portions 23 arranged in the circumferential direction.

Additionally, instead of the stator core 21 having the second configuration, for example, the following fourth configuration or sixth configuration may be provided.

Fourth configuration: a configuration in which the number of tooth portions 23 between the adhesive portions 41 adjacent to each other in the circumferential direction is a prime number different from each other in a portion of the stator core 21 region in the circumferential direction in one of the layers formed by the plurality of adhesive portions 41 , placed in the laying direction.

In other words, the fourth configuration is a configuration in which the second intervals next to each other in the circumferential direction are prime numbers different from each other in a portion of the area of the stator core 21 in the circumferential direction in one of the layers formed by a plurality of adhesive parts 41 placed in the direction of installation.

Sixth configuration: a configuration in which the number of tooth portions 23 between the adhesive portions 41 next to each other in the circumferential direction is a prime number different from each other around the entire circumference of the stator core 21 in one of the layers formed by a plurality of adhesive portions 41 arranged in laying direction.

In other words, the sixth configuration is a configuration in which the second intervals next to each other in the circumferential direction are prime numbers different from each other around the entire circumference of the stator core 21 in one of the layers formed by a plurality of adhesive portions 41 arranged in the stacking direction .

Below, the stator core 21 for each case is described, with attention paid to the above configuration.

Case 1.

Next, the stator core 21 shown in the example of Table 1 will be described. 5.

In the stator core 21 of Case 1, four adhesive portions 41 are arranged in a layer formed by the adhesive portions 41 corresponding to the electrical steel sheet 40A. In this layer, four adhesive portions 41 are located on the tooth portions 23A, 23E, 23K and 23O. Then, in each of the layers formed by the adhesive portions 41 corresponding to the electrical steel sheets 40B to 40D, each of the tooth portions 23 on which the adhesive portion 41 is located is shifted to the first side in the circumferential direction by one tooth portion relative to the layers adjacent the first side. in the direction of installation.

In each of the layers formed by the adhesive portions 41 corresponding to the electrical steel sheets 40E and 40F, each of the tooth portions 23 on which the adhesive portion 41 is located is shifted to the first side in the circumferential direction by one tooth portion relative to the layers adjacent the first side in laying direction. Additionally, in each of the layers of the adhesive parts 41 corresponding to the electrical steel sheets 40E and 40F, the number of the adhesive parts 41 arranged is reduced to three. Particularly, in the layer formed by the adhesive portion 41 corresponding to the electrical steel sheet 40E, when the adhesive portion 41 tries to move away from the tooth portion 23R to the first side in the circumferential direction, the adhesive portion 41 does not move toward the tooth portion 23A but disappears.

In each of the layers formed by the adhesive portions 41 corresponding to the electrical steel sheets 40G and 40H, each of the tooth portions 23 on which the adhesive portion 41 is located is shifted to the first side in the circumferential direction by one tooth portion relative to the layers adjacent the first side in laying direction. Additionally, in each of the layers of the adhesive parts 41 corresponding to the electrical steel sheets 40G and 40H, the number of the adhesive parts 41 increases

- 13 044446 to four. Specifically, in the layer formed by the adhesive portion 41 corresponding to the electrical steel sheet 40G, the adhesive portion 41 is located on the tooth portion 23A.

In each of the layers formed by the adhesive portions 41 corresponding to the electrical steel sheets 40I and 40J, each of the tooth portions 23 on which the adhesive portion 41 is located is shifted to the first side in the circumferential direction by one tooth portion relative to the layers adjacent the first side in laying direction. Additionally, in each of the layers of the adhesive parts 41 corresponding to the electrical steel sheets 40I and 40J, the number of the adhesive parts 41 arranged is reduced to three again. Particularly, in the layer formed by the adhesive portion 41 corresponding to the electrical steel sheet 40I, when the adhesive portion 41 tries to move away from the tooth portion 23R to the first side in the circumferential direction, the adhesive portion 41 does not move toward the tooth portion 23A but disappears.

Table 5

23 A 23 IN 23 WITH 23 D 23 E 23 F 23 G 23 N 23 I 23 J 23 TO 23 L 23 M 23 N 23 ABOUT 23 R 23 Q 23 R 40A O O O O 40V O O O O 40C O O O O 40D O O O O 40E O O O 40F O O O 40G O O O O 40N O O O O 401 O O O 40J O O O

In such a stator core 21, it can be said that some layers formed by the plurality of adhesive parts 41 have a fourth configuration, and the remaining layers have a sixth configuration.

Thus, in the layers having four adhesive portions 41, for example, in the layer corresponding to the electrical steel sheet 40A of the layers formed by the adhesive portions 41, the second spacings are arranged in the order of 3, 5, 3, and 3 to the first side in the circumferential direction. These layers have a fourth configuration.

Further, in the layers having three adhesive portions 41, for example, in the layer corresponding to the electrical steel sheet 40E from the layers formed by the adhesive portions 41, the second spacings are arranged in the order of 3, 5 and 7 to the first side in the circumferential direction. These layers have a sixth configuration.

The stator core 21 of case 1 does not have the third configuration and the fifth configuration.

Case 2.

The following describes the stator core of the example shown in Table. 6.

In the stator core 21 of case 2, six adhesive parts 41 are arranged in a layer formed by the adhesive parts 41 corresponding to the electrical steel sheet 40A. In this layer, a total of six adhesive portions 41 are arranged on the tooth portions 23A, 23D, 23G, 23J, 23M, and 23P. Then, in the layers formed by the adhesive portions 41 corresponding to the electrical steel sheets 40B and 40C, each of the tooth portions 23 on which the adhesive portion 41 is located is shifted to the first side in the circumferential direction by one tooth portion relative to the layers adjacent the first side in the direction styling

In each of the layers, by means of the adhesive portions 41 corresponding to the electrical steel sheets 40D to 40I, each of the tooth portions 23 on which the adhesive portion 41 is located is shifted to the first side in the circumferential direction by one tooth portion relative to the layers adjacent to the first side in the laying direction . Additionally, in each of the layers of the adhesive parts 41 corresponding to the electrical steel sheets 40D to 40I, the number of the adhesive parts 41 arranged is reduced to three. Particularly, in the layer formed by the adhesive portion 41 corresponding to the electrical steel sheet 40D, when the adhesive portion 41 tries to move away from the tooth portions 23F, 23L and 23R to the first side in the circumferential direction, the adhesive portion 41 does not move toward the tooth portions 23G, 23M and 23a, but disappears.

In each of the layers, by means of the adhesive portions 41 corresponding to the electrical steel sheet 40J, the tooth portion 23 on which the adhesive portion 41 is located is shifted to the first side in the circumferential direction by one tooth portion relative to the layers adjacent to the first side in the laying direction. Additionally, the number of glue

- 14 044446 the adhesive parts 41 are increased to 6 in each of the layers formed by the adhesive parts 41 corresponding to the electrical steel sheet 40J. Specifically, in the layer formed by the adhesive portions 41 corresponding to the electrical steel sheet 40J, the adhesive portions 41 are located on the tooth portions 23A, 23G and 23M.

Table 6

23 A 23 IN 23 WITH 23 D 23 E 23 F 23 G 23 N 23 I 23 J 23 TO 23 L 23 M 23 N 23 ABOUT 23 R 23 Q 23 R 40A O O O O O O 40V O O O O O O 40C O O O O O O 40D O O O 40E O O O 40F O O O 40G O O O 40N O O O 401 O O O 40J O O O O O O

Such a stator core 21 can be said to have a fifth configuration in some of the tooth portions 23 of a plurality of tooth portions 23 arranged in the circumferential direction.

Thus, the tooth portions 23A, 23D, 23G, 23J, 23M and 23P in which the three placement areas overlap each other in a top view when viewed in the laying direction will be described hereinafter. For example, in the tooth portion 23A, the first intervals next to each other in the laying direction are arranged in the order 5 and 2 from the first side to the second side in the laying direction along the entire length of the stator core 21 in the laying direction. For example, in the tooth portion 23D, the first intervals next to each other in the laying direction are arranged in order 2 and 5 from the first side to the second side in the laying direction along the entire length of the stator core 21 in the laying direction.

The tooth portions 23A, 23D, 23G, 23J, 23M and 23P have a fifth configuration.

The stator core 21 of case 2 does not have the third configuration, the fourth configuration and the sixth configuration.

In the tooth portion 23A, the first intervals are 5 and 2 from the first side to the second side in the laying direction. However, for example, in the tooth portion 23A, the first intervals may be 5, 2, 5, 2, ..., from the first side to the second side in the stacking direction. Then, in the tooth portion 23B, the first intervals may be 5, 2, 2, 5, ..., from the first side to the second side in the laying direction. Thus, the first spacing may vary for each of the tooth portions 23.

Case 3.

The following describes the stator core of the example shown in Table. 7.

There are 21 stator cores of the example shown in Table. 7, 16 sheets of 40 (400 and 40A-40O) electrical steel are stacked on top of each other. 400 electrical steel sheet is not shown in the table.

In the stator core 21 of case 3, four adhesive parts 41 are arranged in a layer formed by the adhesive parts 41 corresponding to the electrical steel sheet 40A. In this layer, four adhesive portions 41 are located on the tooth portions 23A, 23D, 23J and 23M. Then, in each of the layers formed by the adhesive portions 41 corresponding to the electrical steel sheets 40B to 40O, the tooth portion 23 on which the adhesive portion 41 is located is shifted to the first side in the circumferential direction by one tooth portion relative to the layers adjacent to the first side in the direction styling

- 15 044446

Table 7

23 A 23 IN 23 WITH 23 D 23 E 23 F 23 G 23 N 23 I 23 J 23 TO 23 L 23 M 23 N 23 ABOUT 23 R 23 Q 23 R 40A O O O O 40V O O O O 40C O O O O 40D O O O O 40E O O O O 40F O O O O 40G O O O O 40N O O O O 401 O O O O 40J O O O O 40K O O O O 40L O O O O 40M O O O O 40N O O O O 400 O O O O

Such a stator core 21 can be said to have a fifth configuration in all tooth portions 23 arranged in the circumferential direction.

Thus, the tooth portions 23A to 23C and 23J to 23L in which the three placement areas overlap each other in a top view when viewed in the laying direction will be described hereinafter. In the tooth portions 23, the first intervals next to each other in the laying direction are arranged in an order of 5 and 2 from the first side to the second side in the laying direction along the entire length of the stator core 21 in the laying direction. Next, the tooth portions 23G-23I and 23P-23R, in which three placement areas overlap each other in a top view when viewed in the laying direction, will be described. In the tooth portions 23, the first intervals next to each other in the laying direction are arranged in a 2.5 order from the first side to the second side in the laying direction along the entire length of the stator core 21 in the laying direction. Next, the tooth parts 23D-23F and 23M-23O, in which the four placement areas overlap each other in a top view when viewed in the laying direction, will be described. In the tooth portions 23, the first intervals next to each other in the laying direction are arranged in the order 2, 5 and 2 from the first side to the second side in the laying direction along the entire length of the stator core 21 in the laying direction.

Further, it can be said that such a stator core 21 has a sixth configuration in all layers for the layer formed by a plurality of adhesive parts 41.

Thus, in all layers formed by the adhesive portions 41, the second spacings are arranged in the order of 2, 5, 2 and 5 to the first side in the circumferential direction.

The stator core 21 of case 3 does not have the third configuration and the fourth configuration.

Here, the configuration of the stator core 21 in which the adhesive portion 41 is arranged such that it has at least one of the third configuration and the fourth configuration is hereinafter referred to as the first unequal interval configuration. The configuration of the stator core 21 in which the adhesive portion 41 is arranged so that it has one of the fifth configuration and the sixth configuration is hereinafter referred to as the second unequal interval configuration. The configuration of the stator core 21 in which the adhesive portion 41 is arranged so that it has both the fifth configuration and the sixth configuration is hereinafter referred to as the third unequal interval configuration.

The stator core 21 having a first unequally spaced configuration, a second unequally spaced configuration, or a third unequally spaced configuration can further prevent the resonant frequencies of the motor and the laminated core from matching.

In the stator core 21 of case 1, since some layers formed by the plurality of adhesive parts 41 have a fourth configuration, the stator core 21 of this example has a fourth configuration. Since the remaining layers of the layers formed by the plurality of adhesive portions 41 have a sixth configuration, the stator core of this example has a sixth configuration. The stator core 21 of case 1 does not have the third configuration and the fifth configuration.

Therefore, the stator core 21 of case 1 has the first configuration at unequal intervals since it has the fourth configuration of the third configuration and the fourth configuration.

- 16 044446

The stator core 21 of case 1 has only the sixth configuration of the fifth configuration and the sixth configuration. Therefore, the stator core 21 of this example has a second unequally spaced configuration but does not have a third unequally spaced configuration.

The stator core 21 of case 2 has a fifth configuration. The stator core 21 of case 2 does not have the third configuration, the fourth configuration and the sixth configuration.

Therefore, the stator core 21 of this example does not have the first unequal interval configuration because it does not have both the third configuration and the fourth configuration.

The stator core 21 of this example has only the fifth configuration of the fifth configuration and the sixth configuration. Therefore, the stator core 21 of this example has a second unequally spaced configuration but does not have a third unequally spaced configuration.

The stator core 21 of case 3 does not have the third configuration and the fourth configuration, but has the fifth configuration and the sixth configuration.

Therefore, the stator core 21 of this example does not have the first unequally spaced configuration and the second unequally spaced configuration, but has the third unequally spaced configuration.

In the first to third unequal interval configurations, the effect of preventing the resonant frequencies of the electric motor and the laminated core (stator core) from matching is greater in the second unequal interval configuration than in the first unequal interval configuration. This is because in the second unequal spacing configuration, the placement areas of the adhesive parts 41 overlap each other at intervals of different prime numbers of layers along the entire length in the laying direction, or the number of the adhesive parts 41 is a prime number in which the numbers of the tooth parts 23 are between the adhesive parts 41 next to each other in the circumferential direction along the entire circumference are different from each other. Therefore, this is because the second unequal spacing configuration improves the heterogeneity of the adhesive portion of the laminated core compared with the first unequal spacing configuration.

This effect is greater in the third unequally spaced configuration than in the second unequally spaced configuration. This is because in the third unequal spacing configuration, the placement areas of the adhesive parts 41 overlap each other at intervals of different prime number of layers along the entire length in the stacking direction, and also the adhesive parts 41 are a prime number in which the number of tooth parts 23 is between the adhesive parts 41 next to each other in the circumferential direction along the entire circumference are different from each other. Therefore, this is because the third unequal spacing configuration improves the non-uniformity of the adhesive portion of the laminated core to a greater extent compared with the second unequal spacing configuration.

For the adhesive portion 41, for example, a thermosetting adhesive material is used through resin bonding or the like. As the adhesive material composition, (1) acrylic resin, (2) epoxy resin, (3) a composition containing acrylic resin and epoxy resin, etc. can be applied.

As the adhesive material, a radical polymerization adhesive material and the like can also be used, in addition to a thermosetting adhesive material. From a performance standpoint, room temperature curing (a type of room temperature adhesive) adhesive material is desirable. The room temperature curing adhesive cures at 20-30°C. In addition, in this specification, a range of numerical values represented by using - means a range including numerical values before and after - as a lower limit value and an upper limit value.

As a room temperature-curable adhesive material, an acrylic-based adhesive material is preferred. Typical acrylic adhesives include second generation acrylic adhesive (SGA) and the like. Anaerobic adhesive material, instant adhesive material and acrylic-based elastomer-containing adhesive material can be used provided that the advantages of the present invention are not impaired.

The adhesive material referred to here means the state before curing. The adhesive material becomes the adhesive portion 41 when the adhesive material is cured.

The average tensile modulus E of the adhesive portion 41 at room temperature (2030°C) is in the range of 1500-4500 MPa. When the average tensile modulus E of the adhesive portion 41 is less than 1500 MPa, a problem arises that the rigidity of the laminated core is reduced. Therefore, the lower limit value of the average tensile modulus E of the adhesive portion 41 is 1500 MPa, and more preferably 1800 MPa. On the contrary, when the average tensile modulus E of the adhesive portion 41 exceeds 4500 MPa, a problem arises that the insulating coating formed on the surface of the electrical steel sheet 40 peels off. Therefore, the upper limit value of the average tensile modulus E of the adhesive portion 41 is 4500 MPa, and more preferably 3650 MPa.

The average tensile modulus E is measured using a resonance method. In cha

- 17 044446 tensile modulus is measured based on JIS R 1602:1995.

More specifically, a measurement sample (not shown) is first produced. This sample is obtained by bonding two electrical steel sheets 40 with an adhesive material to be measured, and curing the adhesive material to form an adhesive portion 41. When the adhesive material is thermosetting, curing is performed by heating and pressurizing under conditions of heating and creating increased pressure in the actual operation. On the other hand, when the adhesive material is curable at room temperature, it is performed by applying elevated pressure at room temperature.

The tensile modulus of this sample is then measured using a resonance method. As described above, the method for measuring the tensile modulus by the resonance method is performed on the basis of JIS R 1602:1995. Thereafter, the tensile modulus of only the adhesive portion 41 is obtained by removing the influence of the electrical steel sheet 40 itself from the tensile modulus (measured value) of the image through calculation.

The tensile modulus obtained from the sample in this way is equal to the average value of all the stator cores 21, which are laminated cores. Therefore, this value is considered as the average tensile modulus E. The composition is set such that the average tensile modulus E barely changes at the laying position in the laying direction or at the circumferential position around the central axis of the stator core 21. Therefore, the average tensile modulus E can be set to the value obtained by measuring the cured adhesive portion 41 at the upper end position of the stator core 21.

As a bonding method using a thermosetting adhesive material, for example, a method in which the adhesive material is applied to the electrical steel sheet 40 and then bonded by either one of heating and compression laying or both of them can be used. The heating element, for example, may be one of a high-temperature bath or electric furnace heating method, a direct power supply method, or the like. and can be anything.

In order to obtain stable and sufficient adhesive strength, the thickness of the adhesive portion 41 is preferably 1 μm or more.

On the other hand, when the thickness of the adhesive portion 41 exceeds 100 μm, the adhesive force is saturated. Additionally, as the adhesive portion 41 becomes thicker, the surface coefficient decreases, and magnetic properties such as laminated core steel loss deteriorate. Therefore, the thickness of the adhesive portion 41 is 1 µm or more and 100 µm or less. The thickness of the adhesive portion 41 is more preferably 1 µm or more and 10 µm or less.

In the above description, the thickness of the adhesive portion 41 means the average thickness of the adhesive portion 41.

The average thickness of the adhesive portion 41 is more preferably 1.0 µm or more and 3.0 µm or less. When the average thickness of the adhesive portion 41 is less than 1.0 μm, sufficient adhesive force cannot be provided as described above. Therefore, the lower limit of the average thickness of the adhesive portion 41 is 1.0 µm, and more preferably 1.2 µm. On the contrary, when the average thickness of the adhesive portion 41 becomes greater than 3.0 μm, problems such as a significant increase in the tension amount of the electrical steel sheet 40 due to shrinkage during solidification occur. Therefore, the upper limit of the average thickness of the adhesive portion 41 is 3.0 µm, and more preferably 2.6 µm.

The average thickness of the adhesive part 41 is the average of all laminated cores. The average thickness of the adhesive portion 41 is substantially unchanged at the laying position in the laying direction or the circumferential position around the central axis of the stator core 21. Therefore, the average thickness of the adhesive portion 41 can be set to the average of the numerical values measured at 10 or more points in the circumferential direction at the upper end position of the stator core 21.

The average thickness of the adhesive parts 41 can be adjusted, for example, by changing the amount of adhesive material applied. Additionally, in the case of a thermosetting adhesive material, the average tensile modulus E of the adhesive portion 41 can be adjusted, for example, by changing one or both of the heating and pressure conditions applied during bonding and the type of curing agent.

In the present embodiment, a plurality of electrical steel sheets 40 forming the rotor core 31 are attached to each other by means of a dowel 42 (see FIG. 1). However, a plurality of electrical steel sheets 40 forming the rotor core 31 can be stacked on top of each other by means of the adhesive portion 41.

Laminated cores such as the stator core 21 and the rotor core 31 can be formed by so-called coil laying.

The electric motor 10, for example, can be rotated at a rotation speed of 1000 rpm by applying a drive current having an effective value of 10 A and a frequency of 100 Hz to each of

- 18 044446 phases.

As described above, in the stator core 21 (laminated core) according to the present embodiment, the adhesive portion 41 that glues the electrical steel sheets 40 is disposed between the electrical steel sheets 40 adjacent to each other in the stacking direction. The adhesive portion 41 partially glues the electrical steel sheets 40 next to each other in the stacking direction. The adhesive portions 41 next to each other in the laying direction have different placement areas in a top view when viewed in the laying direction.

With this configuration, compared with the case in which the placement areas of the adhesive portions adjacent to each other in the laying direction overlap each other when viewed from above when viewed in the laying direction, the least common multiple of the adhesive portion adjacent to the predetermined adhesive portion in the laying direction and the adhesive portions adjacent to the predetermined adhesive portion in the circumferential direction becomes large. Therefore, the resonant frequency of the stator core 21 may increase. As a result, it is possible to prevent the resonant frequencies of the electric motor 10 and the stator core 21 from coinciding. Therefore, the stator core 21 is less likely to vibrate, and the motor performance of the stator core 21 can be improved.

Typically, the adhesive material shrinks as it cures. Consequently, compressive stress is applied to the electrical steel sheet as the adhesive material cures. When compressive mechanical stress is applied, the electrical steel sheet is tensioned.

In the stator core 21 (laminated core) according to the present embodiment, the adhesive portion 41 is provided on at least one of the surface 22a of the core back portion 22 and the surface 23a of the tooth portion 23 in the electrical steel sheet 40.

Thus, the area in which the adhesive portion 41 is provided is reduced compared to the case in which the adhesive portion 41 is provided over the entire surface for the laying surface of the electrical steel sheet 40. Therefore, the amount of tension applied to the electrical steel sheet 40 by the adhesive portion 41 is reduced. Therefore, deterioration of the magnetic properties of the stator core 21 can be limited.

In the stator core 21 (laminated core) according to the present embodiment, the adhesive parts 41 are provided at N-layer intervals (N is a prime number) such that their placement areas overlap each other in a top view when viewed in the stacking direction.

Therefore, since the adhesive portions adjacent to each other in the laying direction have different placement areas when viewed from above when viewed in the laying direction, the resonant frequencies of the electric motor 10 and the stator core 21 can be prevented from matching. For example, when viewed from above when viewed in the laying direction, the tension formed in the electrical steel sheet 40 becomes uniform in the laying direction, unlike the case in which the adhesive portion placement areas overlap each other in the laying direction at inconsistent intervals. Therefore, it is possible to limit the displacement of the tension formed in the electrical steel sheet 40 due to the curing of the adhesive material in the stator core 21 as a whole.

Specifically, the adhesive portions 41 are provided at single-layer intervals such that their placement areas overlap each other in a plan view when viewed in the laying direction. In this way, it is possible to limit the local concentration of the electrical steel sheets 40 joined by gluing on a portion of the stator core 21 in the stacking direction. Therefore, the electrical steel sheets 40 joined by gluing can be distributed in the stacking direction. Therefore, it is possible to prevent the resonant frequencies of the electric motor 10 and the stator core 21 from coinciding. As a result, the motor performance of the stator core 21 can be further improved.

Additionally, the adhesive portions 41 are provided at intervals of a prime number of layers such that their placement areas overlap each other in a plan view when viewed in the laying direction.

Since the number of divisors N, which is a prime number, is small, the least common multiple of the adhesive portion adjacent to the predetermined adhesive portion in the stacking direction and the adhesive portion adjacent to the predetermined adhesive portion in the circumferential direction becomes large. Therefore, the resonant frequency of the stator core 21 may increase. As a result, it is possible to prevent the resonant frequencies of the electric motor 10 and the stator core 21 from coinciding. Therefore, the motor performance of the stator core 21 can be further improved.

The laying surface of the electrical steel sheet 40 located at one end in the stacking direction of the plurality of electrical steel sheets 40 is completely adhered to the laying surface of the electrical steel sheets 40 adjacent to each other in the stacking direction. Additionally, the laying surface of the electrical steel sheet 40 located at the other end in the stacking direction of the plurality of electrical steel sheets 40 is completely adhered

- 19 044446 is applied to the laying surface of the electrical steel sheets 40 next to each other in the laying direction.

Therefore, the separation of the laying surface of the electrical steel sheet 40 located at one end in the laying direction and the laying surface of the electrical steel sheet 40 adjacent to this surface in the laying direction of the electrical steel sheets 40 from each other in the laying direction is limited to both the outer circumferential edge, and in the central area of the surface. Therefore, it is possible to limit the generation of vibration between surfaces adjacent to each other in the laying direction.

Likewise, in the electrical steel sheet 40 located at the other end in the stacking direction of the electrical steel sheets 40, it is also possible to limit the generation of vibration between surfaces adjacent to each other in the stacking direction.

The electric motor 10 according to the present embodiment includes a stator core 21 (laminated core) according to the present embodiment. Therefore, the motor performance of the motor 10 can be improved.

The scope of the present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the object of the present invention.

The shape of the stator core is not limited to the shape shown in the above-described embodiment. In particular, the dimensions of the outer diameter and inner diameter of the stator core, the stacking thickness, the number of slots, the size ratio between the circumferential direction and the radial direction of the tooth portion, the size ratio in the radial direction between the tooth portion and the back portion of the core, etc. can be arbitrarily calculated according to the required properties of the electric motor.

In the rotor of the above-described embodiment, although a set of two permanent magnets 32 forms one magnetic pole, the present invention is not limited to this. For example, one permanent magnet 32 may form one magnetic pole, or three or more permanent magnets 32 may form one magnetic pole.

In the above-described embodiment, although a permanent magnet excited motor is described as an example of an electric motor, the structure of the electric motor is not limited to this, and various known structures not exemplified below can also be used.

In the above-described embodiment, although the permanent magnet motor is described as an example of a synchronous motor, the present invention is not limited to this. For example, the electric motor may be a reluctance motor or an electromagnetic field motor (two-winding motor).

In the above-described embodiment, although the synchronous motor is described as an example of an AC motor, the present invention is not limited to this. For example, the electric motor may be an induction motor.

In the above-described embodiment, although the AC motor is described as an example of an electric motor, the present invention is not limited thereto. For example, the electric motor may be a DC motor.

In the embodiments, although an electric motor is described as an example of an electric motor, the present invention is not limited to this. For example, the electric motor may be a generator.

In the above-described embodiment, although the case in which the laminated core according to the present invention is applied to a stator core is illustrated as an example, the laminated core according to the present invention can also be applied to a rotor core.

In addition, the components in the above-described embodiment can be replaced with known components as appropriate without departing from the purpose of the present invention, and the above-described modified examples can be properly combined.

Industrial applicability

According to the present invention, it is possible to provide a laminated core in which the performance of an electric motor is improved, and an electric motor including the laminated core. Therefore, industrial applicability is wide.

Brief description of links with numbers.

- electric motor;

- stator;

- stator core (laminated core);

- part of the core back;

- tooth part;

- rotor;

- rotor core (laminated core);

- permanent magnet;

- 20 044446

- through hole;

- sheet of electrical steel;

- adhesive part;

- casing;

- rotary shaft.

Claims (6)

1. Laminated core containing: a plurality of electrical steel sheets stacked on top of each other; and an adhesive portion placed between the electrical steel sheets adjacent to each other in the laying direction and configured to adhere the electrical steel sheets to each other, wherein the adhesive portion partially glues the electrical steel sheets adjacent to each other in the laying direction, and the adhesive portions adjacent to each other. to each other in the laying direction have different placement areas when viewed from above when viewed in the laying direction, the adhesive portions include a portion in which the placement areas overlap each other when viewed from above when viewed in the laying direction, and wherein if the adhesive portion between the electrical sheets forms layer, then the number of layers between the adhesive parts in the laying direction of the adhesive parts whose placement areas overlap each other in the laying direction is a simple number for all electrical sheets in the laying direction. 2. Laminated core according to claim 1, in which: the electrical steel sheet includes an annular core back portion and a plurality of tooth portions that protrude from the core back portion in a radial direction and are spaced at intervals in a circumferential direction of the core back portion; and adhesive portions are provided on at least one of a laying surface of the core back portion and a laying surface of the tooth portion. 3. Laminated core according to any one of claims 1, 2, in which the average thickness of the adhesive part is 1.0-3.0 microns. 4. Laminated core according to any one of claims 1-3, in which the average modulus E of elasticity during tension of the adhesive part is 1500-4500 MPa. 5. The laminated core according to any one of claims 1 to 4, wherein the adhesive portion is a room temperature adhesive acrylic-based adhesive material containing SGA made from an elastomer-containing acrylic-based adhesive material. 6. An electric motor including a laminated core according to any one of claims 1-5.