Method for manufacturing adhesive laminated core for stator

Abstract

Provided is a rotary electric machine provided with an adhesive laminated core for a stator, which has excellent productivity and high mechanical strength, and which is capable of reducing vibration or noise of the rotary electric machine and suppressing iron loss. The adhesive laminated iron core for the stator comprises a plurality of electromagnetic steel plates which are laminated with each other and both surfaces of which are covered by an insulating film, and an adhesive part which is arranged between the electromagnetic steel plates adjacent to each other in the lamination direction and which adheres the electromagnetic steel plates to each other. All groups of the electromagnetic steel sheets adjacent to each other in the lamination direction are bonded by a bonding part, the bonding agent forming the bonding part is a quick-setting type bonding agent and a thermosetting type bonding agent, and the bonding part is partially arranged between the electromagnetic steel sheets adjacent to each other in the lamination direction.

Description

[0001] This application is a divisional application of the invention patent application filed on December 17, 2019, with application number 201980083030.4 and invention title "Stator Adhesive Laminated Iron Core, Manufacturing Method Thereof, and Rotary Electric Machine". Technical Field

[0002] This invention relates to a method for manufacturing a bonded laminated iron core for a stator.

[0003] This application claims priority based on Japanese Patent Application No. 2018-235870, filed in Japan on December 17, 2018, the contents of which are incorporated herein by reference. Background Technology

[0004] Previously, stacked cores consisting of multiple electromagnetic steel plates stacked on top of each other were known as cores used in rotating electric machines. These electromagnetic steel plates were joined by methods such as welding, bonding, and riveting. However, joining by welding or riveting makes it difficult to reduce vibration in rotating electric machines and to achieve high mechanical strength.

[0005] Patent Document 1 discloses a laminated iron core, which is achieved by partially bonding and laminating individual electromagnetic steel plates with a cyanoacrylate-based adhesive, followed by vacuum impregnation with epoxy resin to bond the electromagnetic steel plates together across their entire surfaces. Patent Document 2 discloses a laminated iron core, which is achieved by applying a cyanoacrylate-based instant adhesive to the sides of a laminate containing electromagnetic steel plates and temporarily fixing it, followed by impregnation with a thermosetting resin such as epoxy resin to bond the electromagnetic steel plates together across their entire surfaces.

[0006] Prior technology documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2003-264962

[0009] Patent Document 2: Japanese Patent Application Publication No. 2005-019642 Summary of the Invention

[0010] The technical problem that the invention aims to solve

[0011] However, existing methods such as those in Patent Documents 1 and 2 are less productive and cannot adequately suppress iron losses in the resulting rotating motor.

[0012] The purpose of this invention is to provide a stator adhesive laminated iron core with excellent manufacturability, high mechanical strength, which can reduce vibration or noise of rotating electric machines and suppress iron loss, as well as a method for manufacturing the same, and a rotating electric machine having a stator adhesive laminated iron core.

[0013] means of solving technical problems

[0014] One embodiment of the present invention has the following scheme.

[0015] [1] A stator adhesive laminated iron core, comprising: a plurality of electromagnetic steel plates, which are stacked on top of each other and covered on both sides by an insulating film, and

[0016] An adhesive portion is disposed between adjacent electromagnetic steel plates along the stacking direction to bond these electromagnetic steel plates together.

[0017] All groups of the electromagnetic steel plates that are adjacent to each other along the stacking direction are bonded together by a plurality of the adhesive portions;

[0018] The adhesive forming the bonded portion is a fast-curing adhesive or a thermosetting adhesive;

[0019] The adhesive portion is partially provided between adjacent electromagnetic steel plates along the stacking direction.

[0020] [2] Stator adhesive laminate core as described in [1], wherein the adhesive portion comprises: a first adhesive portion formed by the quick-setting adhesive, and a second adhesive portion formed by the thermosetting adhesive.

[0021] [3] As described in [2], the stator adhesive laminate core includes: the first adhesive portion disposed between the teeth of each of the electromagnetic steel plates, and the second adhesive portion disposed between the back sides of the core.

[0022] [4] Stator adhesive laminated iron core as described in [2] or [3], wherein the first adhesive part is a dot with an average diameter of 3 mm or more and 7 mm or less, and the second adhesive part is a dot with an average diameter of 5 mm or more and 10 mm or less.

[0023] Between each of the electromagnetic steel plates, relative to the total bonding area of ​​the adhesive portion, the proportion of the bonding area of ​​the first adhesive portion is more than 5% and less than 50%, and the proportion of the bonding area of ​​the second adhesive portion is more than 50% and less than 95%.

[0024] [5] Stator adhesive laminated iron core as described in [2] or [3], wherein the first adhesive part is a dot with an average diameter of 3 mm or more and 7 mm or less, and the second adhesive part is a dot with an average diameter of 5 mm or more and 10 mm or less.

[0025] Between each of the electromagnetic steel plates, relative to the total bonding area of ​​the adhesive portion, the proportion of the bonding area of ​​the first adhesive portion is 5% or more and less than 50%, and the proportion of the bonding area of ​​the second adhesive portion is 50% or more and less than 95%.

[0026] [6] Stator adhesive laminate core as described in any of [1] to [5], wherein the fast-setting adhesive is a cyanoacrylate adhesive.

[0027] [7] Stator adhesive laminate core as described in any of [1] to [6], wherein the thermosetting adhesive is an epoxy resin-based adhesive comprising an epoxy resin with a glass transition temperature of 80°C or higher and 150°C or lower.

[0028] [8] A stator bonded laminated iron core as described in any of [1] to [7], wherein the bonding area ratio Q of the bonded portion to the tooth portion between each of the electromagnetic steel plates is... B0 The bonding area ratio Q of the adhesive portion to the back of the iron core is between 10% and 70%. A0 It is between 40% and 90%.

[0029] [9] The method for manufacturing a stator using an adhesive laminated iron core as described in [1], wherein,

[0030] After applying the quick-setting adhesive and the thermosetting adhesive to a portion of the surface of the electromagnetic steel plate, it is overlapped and pressed onto another electromagnetic steel plate, and the operation of forming the adhesive portion is repeated.

[0031]

[10] A rotary electric machine comprising a stator with a bonded laminated iron core as described in any of [1] to [8].

[0032] The effects of the invention

[0033] According to the present invention, a stator adhesive laminate core with excellent manufacturability and high mechanical strength, which can reduce vibration or noise of rotating electric machines and suppress iron loss, and a method for manufacturing the same, as well as a rotating electric machine having a stator adhesive laminate core, can be provided. Attached Figure Description

[0034] Figure 1 This is a cross-sectional view of a rotary electric motor with a stator using an adhesive laminated iron core according to one embodiment of the present invention.

[0035] Figure 2 This is a side view of the same stator using stacked iron cores.

[0036] Figure 3 yes Figure 2 The diagram is a cross-sectional view along line A-A, and is an example of the configuration of the adhesive portion of the same stator using adhesive laminated iron cores.

[0037] Figure 4 This is a side view showing the general structure of a manufacturing apparatus for a stator using bonded laminated iron cores. Detailed Implementation

[0038] Hereinafter, with reference to the accompanying drawings, a stator adhesive laminate core according to one embodiment of the present invention, and a rotary electric motor having the stator adhesive laminate core, will be described. In this embodiment, an electric motor is cited as an example of a rotary electric motor; more specifically, an AC motor; more specifically, a synchronous motor; and even more specifically, a permanent magnet magnetic field type motor will be described as an example. Such an electric motor is preferably used, for example, in electric vehicles.

[0039] like Figure 1 As shown, the rotary motor 10 includes a stator 20, a rotor 30, a housing 50, and a rotating shaft 60. The stator 20 and the rotor 30 are housed within the housing 50. The stator 20 is fixed within the housing 50.

[0040] In this embodiment, the rotary motor 10 is an inner rotor type with the rotor 30 located radially inside the stator 20. However, it is also possible to use an outer rotor type with the rotor 30 located outside the stator 20. Furthermore, in this embodiment, the rotary motor 10 is a 12-pole, 18-slot three-phase AC motor. However, the number of poles, slots, and phases can be appropriately changed.

[0041] The rotary motor 10 can, for example, rotate at a speed of 1000 rpm by applying an excitation current of 10 A effective value and 100 Hz to each phase.

[0042] The stator 20 includes a stator adhesive laminated iron core (hereinafter referred to as stator core) 21 and windings not shown.

[0043] The stator core 21 includes an annular core back 22 and multiple teeth 23. Hereinafter, the direction of the central axis О of the stator core 21 (or core back 22) is referred to as the axial direction, the radial direction of the stator core 21 (or core back 22) (the direction orthogonal to the central axis О) is referred to as the radial direction, and the circumferential direction of the stator core 21 (or core back 22) (the direction around the central axis О) is referred to as the circumferential direction.

[0044] The back of the iron core 22 is formed into a ring shape when viewed from above the stator 20 from the axial direction.

[0045] Multiple teeth 23 protrude radially inward from the inner circumference of the back of the core 22 (radially toward the central axis O of the back of the core 22). The multiple teeth 23 are arranged at equal angular intervals circumferentially. In this embodiment, 18 teeth 23 are provided at 20-degree intervals around the central axis O. The multiple teeth 23 are formed to be identical in shape and size. Therefore, the multiple teeth 23 have the same thickness dimension.

[0046] The aforementioned winding is wound around the tooth portion 23. The aforementioned winding can be either concentrated or distributed.

[0047] The rotor 30 is arranged radially inside the stator 20 (stator core 21). The rotor 30 includes a rotor core 31 and a plurality of permanent magnets 32.

[0048] The rotor core 31 is formed into an annular shape, coaxially arranged with the stator 20. The aforementioned rotating shaft 60 is disposed within the rotor core 31. The rotating shaft 60 is fixed to the rotor core 31.

[0049] Multiple permanent magnets 32 are fixed to the rotor core 31. In this embodiment, two permanent magnets 32 form one magnetic pole. Multiple sets of permanent magnets 32 are arranged at equal angular intervals along the circumference. In this embodiment, 12 sets (24 in total) of permanent magnets 32 are arranged at 30-degree intervals around the central axis O.

[0050] In this embodiment, an embedded magnet type motor is used as the permanent magnet magnetic field type motor. Multiple through holes 33 are formed in the rotor core 31, extending axially through the rotor core 31. The multiple through holes 33 are arranged corresponding to the configuration of multiple permanent magnets 32. Each permanent magnet 32 ​​is fixed to the rotor core 31 in a state where it is disposed within its corresponding through hole 33. The fixing of each permanent magnet 32 ​​to the rotor core 31 can be achieved, for example, by using an adhesive to bond the outer surface of the permanent magnet 32 ​​to the inner surface of the through hole 33. Alternatively, a surface magnet type motor may be used instead of an embedded magnet type motor as the permanent magnet magnetic field type motor.

[0051] Both the stator core 21 and the rotor core 31 are laminated cores. For example, the stator core 21 is as follows: Figure 2 As shown, it is formed by stacking multiple electromagnetic steel plates 40.

[0052] Furthermore, the stack thickness (along the entire length of the central axis О) of both the stator core 21 and the rotor core 31 is, for example, set to 50.0 mm. The outer diameter of the stator core 21 is, for example, set to 250.0 mm. The inner diameter of the stator core 21 is, for example, set to 165.0 mm. The outer diameter of the rotor core 31 is, for example, set to 163.0 mm. The inner diameter of the rotor core 31 is, for example, set to 30.0 mm. However, these values ​​are merely examples, and the stack thickness, outer diameter, or inner diameter of the stator core 21, and the stack thickness, outer diameter, or 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 front end of the teeth 23 in the stator core 21. That is, the inner diameter of the stator core 21 is the diameter of the virtual circle inscribed in the front ends of all the teeth 23.

[0053] The electromagnetic steel sheets 40 that form the stator core 21 and the rotor core 31 are formed, for example, by punching or cutting the electromagnetic steel sheet as the base material. Known electromagnetic steel sheets can be used as the electromagnetic steel sheets 40. The chemical composition of the electromagnetic steel sheets 40 is not particularly limited. In this embodiment, a non-oriented electromagnetic steel sheet is used as the electromagnetic steel sheet 40. For example, non-oriented electromagnetic steel strips according to JISC2552:2014 can be used as the non-oriented electromagnetic steel sheet.

[0054] However, as electromagnetic steel sheet 40, oriented electromagnetic steel sheet can also be used instead of non-oriented electromagnetic steel sheet. As oriented electromagnetic steel sheet, for example, oriented electromagnetic steel strip of JISC2553:2012 can be used.

[0055] To improve the workability of the electromagnetic steel sheet and reduce the iron loss of the stator core, it is preferable that both sides of the electromagnetic steel sheet 40 are covered with an insulating film. The following substances can be used as the material constituting the insulating film: (1) inorganic compounds, (2) organic resins, and (3) mixtures of inorganic compounds and organic resins. Examples of inorganic compounds include: (1) a complex of dichromate and boric acid, and (2) a complex of phosphate and silica. Examples of organic resins include epoxy resins, acrylic resins, styrene acrylic resins, polyester resins, silicone resins, and fluoropolymers.

[0056] In the case of being covered by an insulating film, in order to ensure the insulation performance between the electromagnetic steel plates 40 that are stacked together, it is preferable to set the thickness of the insulating film (the thickness of each single electromagnetic steel plate 40) to be 0.1 μm or more.

[0057] On the other hand, as the insulating film thickens, the insulation effect saturates. Furthermore, as the insulating film thickens, the duty cycle decreases, leading to a reduction in the performance of the stator core. Therefore, the insulating film is preferably thinner within a range that ensures insulation performance. The thickness of the insulating film (the thickness of each 40mm single-sided electromagnetic steel sheet) is preferably 0.1μm to 2.0μm, more preferably 0.3μm to 1.2μm.

[0058] As the thickness of the electromagnetic steel sheet 40 decreases, the effect of improving iron loss gradually becomes saturated. Furthermore, as the electromagnetic steel sheet 40 becomes thinner, its manufacturing cost increases. Therefore, considering both the effect of improving iron loss and manufacturing cost, it is preferable to set the thickness of the electromagnetic steel sheet 40 to 0.10 mm or more.

[0059] On the other hand, when the electromagnetic steel plate 40 is too thick, the iron loss will increase. Therefore, when taking into account the iron loss characteristics of the electromagnetic steel plate 40, it is preferable to set the thickness of the electromagnetic steel plate 40 to 0.35 mm or less, and more preferably to set it to 0.20 mm or 0.25 mm.

[0060] Considering the above points, the thickness of each electromagnetic steel plate 40 is, for example, 0.10 mm to 0.65 mm, preferably 0.10 mm to 0.35 mm, and more preferably 0.20 mm or 0.25 mm. Furthermore, the thickness of the electromagnetic steel plate 40 also includes the thickness of the insulating film.

[0061] like Figure 2 As shown, in the stator core 21, adhesive portions 41 are partially provided between all groups of adjacent electromagnetic steel plates 40 along the stacking direction, which bond these electromagnetic steel plates 40 together. All groups of adjacent electromagnetic steel plates 40 along the stacking direction are stacked by the adhesive portions 41 partially provided between them. The adjacent electromagnetic steel plates 40 along the stacking direction are not fixed to each other by other means (e.g., riveting).

[0062] The adhesive portion 41 bonds adjacent electromagnetic steel plates 40 together along the stacking direction. The adhesive portion 41 is an adhesive that has not been broken down and has been cured.

[0063] Adhesive part 41 Figure 3 As shown, it is composed of a first adhesive portion 41a and a second adhesive portion 41b. The first adhesive portion 41a is a fast-curing adhesive that cures without interruption. The second adhesive portion 41b is a thermosetting adhesive that cures without interruption. The first adhesive portion 41a and the second adhesive portion 41b are respectively formed as dots between adjacent electromagnetic steel plates 40 along the lamination direction.

[0064] To ensure a stable and sufficient bond strength, the thickness of the adhesive portion 41 is preferably set to 1 μm or more.

[0065] On the other hand, when the thickness of the adhesive portion 41 exceeds 10 μm, the adhesive force will saturate. Furthermore, as the adhesive portion 41 becomes thicker, the duty cycle decreases, and the magnetic properties of the stator core, such as iron loss, decrease. Therefore, it is preferable to set the thickness of the adhesive portion 41 to be more than 1 μm and less than 10 μm, and more preferably, to be more than 1 μm and less than 5 μm.

[0066] Furthermore, in the above description, the thickness of the adhesive portion 41 means the average thickness of the adhesive portion 41.

[0067] More preferably, the average thickness of the adhesive portion 41 is set to be between 1.0 μm and 3.0 μm. When the average thickness of the adhesive portion 41 is less than 1.0 μm, as mentioned above, sufficient adhesive force cannot be ensured. Therefore, the lower limit of the average thickness of the adhesive portion 41 is set to 1.0 μm, and more preferably, it is set to 1.2 μm. Conversely, when the average thickness of the adhesive portion 41 exceeds 3.0 μm and becomes thicker, defects such as a significant increase in strain of the electromagnetic steel sheet 40 due to shrinkage during thermosetting will occur. Therefore, the upper limit of the average thickness of the adhesive portion 41 is set to 3.0 μm, and more preferably, it is set to 2.6 μm.

[0068] The average thickness of the adhesive portion 41 is the average value of the entire laminated core. The average thickness of the adhesive portion 41 hardly changes at its lamination position along the lamination direction or at its circumferential position around the central axis of the laminated core. Therefore, the average thickness of the adhesive portion 41 can be taken as the average value of the values ​​measured at the upper end of the laminated core at a distance of 10 or more in the circumferential direction.

[0069] The adhesive portion 41 is partially provided between adjacent electromagnetic steel plates 40 along the stacking direction. That is, in the electromagnetic steel plate 40, adhesive regions 42 and non-adhesive regions 43 are formed on the surface (first surface) facing the stacking direction. The adhesive region 42 is the region on the first surface of the electromagnetic steel plate 40 where the adhesive portion 41 is provided, that is, the region on the first surface of the electromagnetic steel plate 40 where the adhesive that has not been broken and cured is provided. The non-adhesive region 43 is the region on the first surface of the electromagnetic steel plate 40 where the adhesive portion 41 is not provided, that is, the region on the first surface of the electromagnetic steel plate 40 where the adhesive that has not been broken and cured is not provided. Preferably, in the stator core 21, the adhesive portion 41 is partially provided between the back sides 22 of the core and also partially provided between the teeth 23 between adjacent electromagnetic steel plates 40 along the stacking direction.

[0070] Typically, the adhesive portion 41 is distributed at multiple locations between adjacent electromagnetic steel plates 40 along the stacking direction.

[0071] Figure 3 This is an example of the configuration of the adhesive portion 41. In this example, the first adhesive portion 41a and the second adhesive portion 41b are formed as a plurality of circular dots. More specifically, in the back of the iron core 22, a plurality of second adhesive portions 41b are formed as dots with an average diameter of 7 mm at equal angular intervals along its circumference. A portion of each second adhesive portion 41b extends into the tooth portion 23. In each tooth portion 23, a plurality of first adhesive portions 41a are formed as dots with an average diameter of 5 mm in the radial direction.

[0072] The average diameter shown here is only one example. The average diameter of the dot-shaped second adhesive portion 41b is preferably 5 mm or more and 10 mm or less, more preferably 6 mm or more and 10 mm or less. The average diameter of the dot-shaped first adhesive portion 41a is preferably 3 mm or more and 7 mm or less, more preferably 3 mm or more and less than 6 mm. The average diameter of the first adhesive portion 41a is preferably smaller than the average diameter of the second adhesive portion 41b.

[0073] also, Figure 3 The formation mode is only one example, and the number, shape and configuration of the adhesive parts 41 set between the electromagnetic steel plates 40 can be appropriately changed as needed.

[0074] The average diameter is obtained by measuring the diameter of the adhesive residue on the adhesive portion 41 where the electromagnetic steel plates 40 have been peeled apart using a ruler. If the top view of the adhesive residue is not a perfect circle, its diameter is set as the diameter of the circumcircle (perfect circle) of the adhesive residue in the top view.

[0075] The average diameter of the teeth on the back of the iron core can also be different for the first and second bonding parts.

[0076] Generally, during the curing of the adhesive, curing shrinkage occurs. Due to this curing shrinkage, compressive and tensile stresses are applied to the electromagnetic steel plate 40. Because of these stresses applied to the electromagnetic steel plate 40, distortion occurs. In particular, in the case of a thermosetting adhesive, the applied stress increases due to the difference in the coefficients of thermal expansion between the electromagnetic steel plate 40 and the bonded portion. The distortion of the electromagnetic steel plate 40 increases the iron losses of the rotating electric motor 10. The effect of the distortion of the electromagnetic steel plate 40 constituting the stator core 21 on iron losses is greater than the effect of the distortion of the steel plate constituting the rotor core 31.

[0077] In this embodiment, the adhesive portion 41 is partially provided, so compared with the case where the adhesive portion 41 is provided on the entire surface, the stress applied to the electromagnetic steel plate 40 is reduced due to curing shrinkage.

[0078] The quick-setting adhesive cures rapidly at room temperature and exhibits less curing shrinkage compared to thermosetting adhesives. Furthermore, the distortion of the electromagnetic steel plate 40 has a greater impact on iron loss at the toothed portion 23 than at the back of the core 22. Therefore, by applying a thermosetting adhesive to the back of the core 22 to form the second adhesive portion 41b, and applying a quick-setting adhesive to the toothed portion 23 to form the first adhesive portion 41a, as in this embodiment, the increase in iron loss can be further suppressed.

[0079] Furthermore, by combining temporary bonding using a fast-curing adhesive that cures quickly with primary bonding using a thermosetting adhesive that has high mechanical strength after curing, and by partially providing bonding portions between the electromagnetic steel plates, a stator core with high productivity, high strength, low noise, and low vibration can be manufactured.

[0080] The bonding area ratio Q0 of the adhesive portion 41 to the electromagnetic steel plate 40 is preferably 10% to 90%, more preferably 20% to 85%, and even more preferably 30% to 70%. When the bonding area ratio Q0 is above the lower limit of the aforementioned range, the mechanical strength of the laminated iron core can be ensured. When the bonding area ratio Q0 is below the upper limit of the aforementioned range, the iron loss suppression effect is even better.

[0081] Furthermore, the bonding area ratio Q0 is the ratio of the area occupied by the bonding portion 41 (bonding area 42) on the first surface of the electromagnetic steel plate 40 to the area of ​​the first surface of the electromagnetic steel plate 40. The calculation of the bonding area ratio Q0 includes both the first bonding portion and the second bonding portion present on the first surface of the tooth.

[0082] The bonding area ratio Q of the bonding part 41 to the back of the iron core 22 A0 Preferably, the adhesive area ratio is 40% to 90%, more preferably 50% to 90%, and even more preferably 60% to 90%. When the adhesive area ratio Q... A0 When the value is above the lower limit of the range, adjacent electromagnetic steel plates 40 along the stacking direction can be bonded to each other with sufficient adhesive strength, thus improving the rigidity of the stator core and resulting in superior noise characteristics. When the bonding area ratio Q... A0 When the value is below the upper limit of the range, the iron loss suppression effect is better.

[0083] In addition, the bonding area ratio Q A0 The area of ​​the adhesive portion 41 (adhesive area 42) on the first surface of the back of the iron core 22 is the ratio of the area of ​​the adhesive portion 41 to the area of ​​the first surface of the back of the iron core 22 of the electromagnetic steel plate 40. The adhesive area ratio Q... A0 The calculation includes both the first adhesive portion and the second adhesive portion present on the first surface of the back of the core. For example, if a portion of the first adhesive portion 41a, formed by a fast-setting adhesive applied to the tooth portion 23, is also present on the back of the core 22, the adhesive area ratio Q is also calculated including this portion. A0 .

[0084] The bonding area ratio Q of the first bonding part 41a to the back side 22 of the iron core A1 Preferably, the adhesive area ratio is 0% to 50%, more preferably 0% to 40%, and even more preferably 0% to 30%. When the adhesive area ratio Q...A1 When the value is above the lower limit of the range, a temporary fixing effect will be obtained. When the adhesive area ratio Q... A1 When the value is below the upper limit of the range, the iron loss suppression effect is better.

[0085] In addition, the bonding area ratio Q A1 The ratio of the area occupied by the first adhesive portion 41a in the first surface of the back of the iron core 22 to the area of ​​the first surface of the back of the iron core 22 of the electromagnetic steel plate 40.

[0086] The bonding area ratio Q of the second bonding part 41b to the back of the iron core 22 A2 Preferably, the bonding area ratio is 5% to 90%, more preferably 15% to 70%, and even more preferably 30% to 65%. When the bonding area ratio Q... A2 When the value is above the lower limit of the range, the rigidity of the laminated core will be improved. When the bonding area ratio Q... A2 When the value is below the upper limit of the range, the iron loss suppression effect is better.

[0087] In addition, the bonding area ratio Q A2 The ratio of the area occupied by the first adhesive portion 41b in the first surface of the iron core back 22 to the area of ​​the first surface of the iron core back 22 of the electromagnetic steel plate 40.

[0088] The bonding area ratio Q of the adhesive part 41 to the tooth part 23 B0 Preferably, the adhesive area ratio is 10% to 70%, more preferably 10% to 50%, and even more preferably 10% to 30%. This is because when the adhesive area ratio Q... B0 When the value is above the lower limit of the range, adjacent electromagnetic steel plates 40 along the stacking direction can be bonded to each other with sufficient adhesive strength, thus suppressing tooth jump and resulting in a superior core shape. When the bonding area ratio Q... B0 When the value is below the upper limit of the range, the iron loss suppression effect is better.

[0089] In addition, the bonding area ratio Q B0 The area of ​​the bonding area 41 (bonding area 42) on the first surface of the tooth 23 is the ratio of the area of ​​the bonding portion 41 to the area of ​​the first surface of the tooth 23 on the electromagnetic steel plate 40. The bonding area ratio Q... B0 The calculation includes both the first adhesive portion and the second adhesive portion present on the first surface of the tooth. For example, if a portion of the second adhesive portion 41b, formed by a thermosetting adhesive applied to the back of the iron core 22, is also present in the tooth 23, the adhesive area ratio Q is also calculated including this portion. B0 .

[0090] The bonding area ratio Q of the first adhesive part 41a to the tooth part 23B1 Preferably, the adhesive area ratio is 5% to 70%, more preferably 6% to 50%, and even more preferably 7% to 30%. When the adhesive area ratio Q... B1 When the value is above the lower limit of the range, a tooth misalignment prevention effect is achieved. When the adhesive area ratio Q... B1 When the value is below the upper limit of the range, the iron loss suppression effect is better.

[0091] In addition, the bonding area ratio Q B1 The ratio of the area occupied by the first adhesive portion 41a in the first surface of the tooth portion 23 to the area of ​​the first surface of the tooth portion 23 of the electromagnetic steel plate 40.

[0092] The bonding area ratio Q of the second adhesive part 41b to the tooth part 23 B2 Preferably, the content is 0% to 65%, more preferably 0% to 50%, and even more preferably 0% to 30%. Adhesive area ratio Q B2 It can also be 0%. When the adhesive area ratio Q B2 When the value is below the upper limit of the range, the iron loss suppression effect is better.

[0093] In addition, the bonding area ratio Q B2 The ratio of the area occupied by the first adhesive portion 41b in the first surface of the tooth portion 23 to the area of ​​the first surface of the tooth portion 23 of the electromagnetic steel plate 40.

[0094] Between adjacent electromagnetic steel plates 40 along the stacking direction, it is preferable that, relative to the total bonding area of ​​the bonding portion 41, the proportion of the bonding area of ​​the first bonding portion 41a (proportion P1) is 5% to 50% and the proportion of the bonding area of ​​the second bonding portion 41b (proportion P2) is 50% to 95%. This readily and sufficiently improves mechanical strength, reduces noise or vibration, and suppresses iron loss. Furthermore, it is more preferable that proportion P1 is 5% or more and less than 50%, and proportion P2 is 50% to 95%. More preferably, proportion P1 is 10% to 40% and proportion P2 is 60% to 90%. Particularly preferred is proportion P1 being 15% to 40% and proportion P2 being 60% to 85%. Most preferably, proportion P1 is 15% to 35% and proportion P2 is 65% to 85%. The sum of proportions P1 and P2 is 100%.

[0095] In addition, when calculating the adhesive area ratios Q0 and Q... A0 Q A1 Q A2 Q B0 Q B1 Q B2When the ratios are P1 and P2, the area of ​​the adhesive traces obtained by image analysis of the adhesive traces of the adhesive portions 41, the first adhesive portion 41a, or the second adhesive portion 41b after the electromagnetic steel plates 40 are peeled off from each other will be used as the area of ​​these adhesive portions relative to the adhesive area.

[0096] In this embodiment, preferably, the first adhesive portion 41a is a dot with an average diameter of 3 mm to 7 mm, and the second adhesive portion 41b is a dot with an average diameter of 5 mm to 10 mm, with a proportion P1 of 5% to less than 50% and a proportion P2 of 50% to 95%. More preferably, the first adhesive portion 41a is a dot with an average diameter of 3 mm to 7 mm, and the second adhesive portion 41b is a dot with an average diameter of 5 mm to 10 mm, with a proportion P1 of 5% to less than 50% and a proportion P2 of 50% to 95%, and the adhesive area ratio Q is [missing information]. B0 The bonding area ratio Q is between 10% and 50%. B1 It is between 6% and 50%.

[0097] Quick-setting adhesives are liquid monomers that polymerize instantly due to trace amounts of moisture in the air or on the surface of the bonded objects, thereby exerting their adhesive properties.

[0098] Examples of fast-curing adhesives include cyanoacrylate-based adhesives and anaerobic adhesives. Among these, known cyanoacrylate-based adhesives are preferred as instant adhesives due to their excellent fast-curing properties.

[0099] As a cyanoacrylate-based adhesive, adhesives polymerized and cured from cyanoacrylates can be used without limitation. Examples of cyanoacrylates included in cyanoacrylate-based adhesives include methyl cyanoacrylate, ethyl cyanoacrylate, methoxyethyl cyanoacrylate, butyl cyanoacrylate, and octyl cyanoacrylate. A cyanoacrylate-based adhesive may include one or more types of cyanoacrylates.

[0100] Thermosetting adhesives can be either one-component or two-component.

[0101] Examples of thermosetting adhesives include epoxy resin adhesives, phenolic resin adhesives, and unsaturated polyester resin adhesives. Among these, epoxy resin adhesives are preferred because they readily produce stator cores with high mechanical strength.

[0102] Epoxy resin adhesives consist of epoxy resin and a curing agent.

[0103] The epoxy resin is not particularly limited, and examples include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol AD ​​type epoxy resin, amine type epoxy resin, alicyclic type epoxy resin, phenolic aldehyde type epoxy resin, and naphthalene type epoxy resin. Among these, phenolic aldehyde type epoxy resin is preferred from the perspective of coatability.

[0104] Epoxy resin adhesives may contain one or more curing agents.

[0105] The glass transition temperature (Tg) of the epoxy resin is preferably 80°C to 150°C, more preferably 100°C to 150°C, and even more preferably 120°C to 150°C. When the Tg of the epoxy resin is above the lower limit of the aforementioned range, it is easy to obtain a stator core with excellent heat resistance and high mechanical strength. When the Tg of the epoxy resin is below the upper limit of the aforementioned range, it is easy to obtain good adhesion to the electromagnet steel plate.

[0106] In addition, the Tg of epoxy resin is the midpoint glass transition temperature determined by differential scanning calorimetry (DSC) in accordance with JIS K7121-1987.

[0107] The number average molecular weight (Mn) of the epoxy resin is preferably 1200 to 20000, more preferably 2000 to 18000, and even more preferably 2500 to 16000. When the Mn of the epoxy resin is above the lower limit of the aforementioned range, it is easier to improve the adhesive strength. When the Mn of the epoxy resin is below the upper limit of the aforementioned range, it is easier to prevent the epoxy resin adhesive from becoming high in viscosity.

[0108] In addition, regarding Mn in epoxy resin, polystyrene is used as a standard substance and can be determined by size-exclusion chromatography (SEC) as described in JIS K 7252-1:2008.

[0109] Regarding the curing agent, commonly used thermosetting epoxy resin curing agents can be used. The curing agent is not particularly limited; examples include anhydride-based curing agents (phthalic anhydride, hexahydrophthalic anhydride, 4-methylhexahydrophthalic anhydride, etc.), phenolic resins, and dicyandiamide (DICY). The epoxy resin adhesive may contain one or more curing agents.

[0110] Phenolic resin is a phenolic resin obtained by condensing phenols (such as phenol) with aldehydes (such as formaldehyde) using an acid catalyst. As a curing agent, phenolic resin is preferred because it readily yields stator cores with high mechanical strength.

[0111] The content of curing agent in epoxy resin adhesives can be appropriately set according to the type of curing agent. For example, when using phenolic resin, it is preferable to be 5 to 35 parts by weight relative to 100 parts by weight of epoxy resin.

[0112] In addition to epoxy resin and curing agent, epoxy resin adhesives may also contain acrylic resin. Alternatively, acrylic-modified epoxy resin, which is obtained by graft polymerization of acrylic resin and epoxy resin, may be used.

[0113] As an acrylic resin, it is not particularly limited. Examples of monomers used in acrylic resins include unsaturated carboxylic acids such as acrylic acid and methacrylic acid, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, cyclohexyl methacrylate, 2-ethylhexyl 2-(meth)acrylate, 2-hydroxyethyl methacrylate, and 2-hydroxypropyl methacrylate. Furthermore, the term "(meth)acrylate" refers to either acrylate or methacrylate.

[0114] The number average molecular weight (Mn) of the acrylic resin is preferably 5,000 to 100,000, more preferably 6,000 to 80,000, and even more preferably 7,000 to 60,000. When the Mn of the acrylic resin is above the lower limit of the aforementioned range, it is easier to improve the adhesive strength. When the Mn of the acrylic resin is below the upper limit of the aforementioned range, it is easier to prevent the epoxy resin adhesive from becoming highly viscous.

[0115] In addition, the Mn content of acrylic resins can be determined using the same method as that of epoxy resins.

[0116] When epoxy resin adhesives contain acrylic resin, the content of acrylic resin is not particularly limited. For example, it can be set to 20% by mass or more and 80% by mass or less relative to the total amount of epoxy resin and acrylic resin.

[0117] In this embodiment, the plurality of electromagnetic steel plates forming the rotor core 31 are fixed to each other by riveting (pins; dowels). However, the plurality of electromagnetic steel plates forming the rotor core 31 may also have a laminated structure that is fixed by adhesive in the same way as the stator core 21.

[0118] Alternatively, the stator core 21 and rotor core 31, etc., can be formed by so-called rotary stacking.

[0119] (Manufacturing method of stator core)

[0120] The stator core 21 can be manufactured, for example, by applying a quick-setting adhesive and a thermosetting adhesive to a portion of the surface of the electromagnetic steel plate 40 at room temperature (e.g., above 20°C and below 30°C), overlapping and pressing it onto another electromagnetic steel plate 40, and repeating the operation of forming the adhesive portion 41.

[0121] The applied quick-setting adhesive cures at room temperature to form the first adhesive portion 41a. Furthermore, by heating during pressing, the thermosetting adhesive cures to form the second adhesive portion 41b.

[0122] Regarding quick-setting adhesives and thermosetting adhesives, one can be applied first, or both can be applied simultaneously. Furthermore, quick-setting adhesives and thermosetting adhesives can be applied separately or in a mixed state.

[0123] The following uses Figure 4 The manufacturing apparatus 100 shown will be used to illustrate the method of manufacturing stator core 21.

[0124] First, the manufacturing apparatus 100 will be described. In the same manufacturing apparatus 100, while feeding the electromagnetic steel sheet P from the steel coil (steel hoop) in the direction of arrow F, it is punched multiple times using dies arranged at each stage, thereby gradually forming it into the shape of an electromagnetic steel sheet 40. A quick-setting adhesive and a thermosetting adhesive are applied to predetermined positions on the lower surface of the second and subsequent electromagnetic steel sheets 40, and the punched electromagnetic steel sheets 40 are stacked in sequence and pressed together while being heated.

[0125] like Figure 4 As shown, the manufacturing apparatus 100 includes: a first-stage punching station 110 located closest to the steel coil; a second-stage punching station 120 disposed adjacent to the punching station 110 on the downstream side along the conveying direction of the electromagnetic steel sheet P; a first adhesive coating station 130 disposed adjacent to the punching station 120 on the downstream side; and a second adhesive coating station 140 disposed adjacent to the first adhesive coating station 130 on the downstream side.

[0126] The punching station 110 includes: a female die 111 disposed below the electromagnetic steel plate P; and a male die 112 disposed above the electromagnetic steel plate P.

[0127] The punching station 120 includes: a female die 121 disposed below the electromagnetic steel plate P; and a male die 122 disposed above the electromagnetic steel plate P.

[0128] The first adhesive coating station 130 and the second adhesive coating station 140 each include a coater 131 and a coater 141, which include multiple syringes arranged according to the configuration pattern of the aforementioned adhesive portion 41.

[0129] The manufacturing apparatus 100 also includes a lamination station 150 located downstream of the second adhesive coating station 140. The lamination station 150 includes a heating device 151, an outer peripheral punching female die 152, a heat insulation component 153, an outer peripheral punching male die 154, and a spring 155.

[0130] The heating device 151, the outer peripheral punching die 15, and the heat insulation component 153 are arranged below the electromagnetic steel plate P.

[0131] The outer peripheral punching male die 154 and the spring 155 are positioned above the electromagnetic steel plate P.

[0132] <Punching Process>

[0133] In the manufacturing apparatus 100 having the above configuration, firstly, the electromagnetic steel sheet P is pulled from the edge of the steel coil. Figure 4 The plates are sequentially fed out in the direction of arrow F. Then, for the electromagnetic steel plate P, the punching process is first performed by punching station 110. Next, for the electromagnetic steel plate P, the punching process is performed by punching station 120. Through these punching processes, a product with the following characteristics is obtained from the electromagnetic steel plate P: Figure 3 The shape of the electromagnetic steel plate 40 with the iron core back 22 and multiple teeth 23 is shown. However, since it has not been punched at this point in time, it proceeds to the next process in the direction of arrow F.

[0134] <Coating Process>

[0135] In the next step, at the first adhesive coating station 130, a quick-setting adhesive is supplied from each syringe of the coater 131 and applied in dots to multiple locations on the lower surface of the teeth 23 of the electromagnet plate 40. Then, in the second adhesive coating station 140, a thermosetting adhesive is supplied from each syringe of the coater 141 and applied in dots to multiple locations on the lower surface of the back of the core 22 of the electromagnet plate 40.

[0136] <Layering Process>

[0137] Next, the electromagnetic steel sheet P is fed to the stacking station 150, punched by the outer peripheral punching die 154, and stacked with high precision. For example, by forming slits at multiple locations on the outer peripheral end of the iron core back and pressing a scale into these slits from the side, misalignment of the individual electromagnetic steel sheets 40 can be prevented, and stacking can be performed with higher precision. During stacking, the electromagnetic steel sheet 40 is subjected to a certain pressure by the spring 155 and heated by the heating device 151 to, for example, 150°C or higher but below 160°C. The curing of the thermosetting adhesive is promoted by this heating.

[0138] By repeating the above-described punching, coating, and lamination processes in sequence, a predetermined number of electromagnetic steel sheets 40 can be laminated via partially provided adhesive portions 41.

[0139] Through the above processes, the stator core 21 is completed.

[0140] The manufacturing method of the stator core is not limited to the aforementioned method. For example, a thermosetting adhesive may be applied in the first adhesive coating station 130, and a quick-setting adhesive may be applied in the second adhesive coating station 140. Furthermore, in either or both of the first adhesive coating station 130 and the second adhesive coating station 140, the thermosetting adhesive and the quick-setting adhesive may be applied separately, or they may be applied in a mixed state.

[0141] Furthermore, the technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0142] The bonding portion for bonding the electromagnetic steel sheets together preferably consists of two parts: a first bonding portion and a second bonding portion. The first bonding portion is formed of a fast-curing adhesive, and the second bonding portion is formed of a thermosetting adhesive. However, a third bonding portion may also be included, which is formed of an adhesive obtained by mixing a fast-curing adhesive with a thermosetting adhesive. When the bonding portion for bonding the electromagnetic steel sheets together includes a third bonding portion, the bonding portion can be only the third bonding portion, or it can be any one of the first and second bonding portions, or a combination of both and the third bonding portion.

[0143] The shape of the stator core is not limited to the form shown in the above embodiments. Specifically, the dimensions of the outer and inner diameters of the stator core, the stack thickness, the number of slots, the circumferential to radial dimensional ratio of the teeth, and the radial dimensional ratio of the teeth to the back of the core can be arbitrarily designed according to the desired characteristics of the rotating motor.

[0144] In the rotor of the above embodiment, two permanent magnets 32 in a group form one magnetic pole, but the present invention is not limited thereto. For example, one permanent magnet 32 ​​can form one magnetic pole, or three or more permanent magnets 32 can form one magnetic pole.

[0145] In the above embodiments, a permanent magnet magnetic field type motor was described as an example of a rotating motor. However, the structure of the rotating motor is not limited to the examples shown below, and various known structures not shown below can also be adopted.

[0146] In the above embodiments, a permanent magnet magnetic field type motor was described as an example of a rotating motor, but the present invention is not limited thereto. For example, the rotating motor may also be a reluctance type motor or an electromagnet magnetic field type motor (winding magnetic field type motor).

[0147] In the above embodiments, a synchronous motor was described as an example of an AC motor, but the present invention is not limited thereto. For example, an induction motor could also be used as a rotary motor.

[0148] In the above embodiments, an AC motor was used as an example of an electric motor, but the present invention is not limited thereto. For example, a DC motor could also be used as a rotary motor.

[0149] In the above embodiments, an electric motor was used as an example of a rotating electric machine, but the present invention is not limited thereto. For example, a generator could also be used as the rotating electric machine.

[0150] It can also replace the rotating electric motor 10, and the stator core 21 can be used in a transformer. In this case, it is preferable to use an oriented electromagnetic steel plate instead of a non-oriented electromagnetic steel plate.

[0151] Furthermore, without departing from the spirit of the present invention, the constituent elements in the above embodiments can be appropriately replaced with well-known constituent elements. In addition, the above variations can be appropriately combined.

[0152] The present invention will now be described in detail with reference to embodiments, but the present invention is not limited thereto by the following description.

[0153] (Adhesive)

[0154] Quick-setting adhesive (A-1): Cyanoacrylate adhesive (product name "Aron Alpha", manufactured by Toa Synthetic Co., Ltd.)

[0155] Thermosetting adhesive (B-1): Epoxy resin adhesive (product name "Three Bond", manufactured by Three Bond Company, Tg of epoxy resin: 130℃).

[0156] (Example 1)

[0157] A steel hoop with components for a non-oriented electromagnetic steel sheet was manufactured, the non-oriented electromagnetic steel sheet containing Si: 3.0 wt%, Al: 0.5 wt%, and Mn: 0.1 wt%. The thickness of the steel base was 0.3 mm. An insulating film treatment solution containing metal phosphate salt and acrylic resin emulsion was applied to the steel hoop, baked at 300°C, and a predetermined amount of insulating film was applied.

[0158] use Figure 4The manufacturing apparatus 100 shown in the figure punches the steel hoop (electromagnetic steel plate) into a single-plate iron core in the following order and stacks them in sequence to produce a stator iron core. The single-plate iron core is annular with an outer diameter of 200 mm and an inner diameter of 134 mm, and has 18 rectangular teeth with a length of 23 mm and a width of 15 mm on the inner diameter side.

[0159] Remove the steel hoop from the edge of the steel coil. Figure 4 The steel hoop is sequentially fed out in the direction of arrow F. Then, for this steel hoop, first, punching processing is performed by punching station 110, followed by punching processing by punching station 120. Through these punching processes, a shape is formed on the steel hoop... Figure 3 The shape of the electromagnetic steel plate 40 with the iron core back 22 and multiple teeth 23 shown (punching process).

[0160] Next, in the first adhesive coating station 130, the quick-setting adhesive (A-1) is applied in dots to predetermined positions on the lower surface (first surface) of the teeth 23 of the steel hoop using the coater 131. Next, in the second adhesive coating station 140, the thermosetting adhesive (B-1) is applied in dots to predetermined positions on the lower surface (first surface) of the back of the iron core 22 of the steel hoop using the coater 141 (coating process).

[0161] Next, using the outer peripheral punching male die 154, the steel hoop sent to the stacking station 150 is punched into a single-plate iron core, and then stacked under pressure (stacking process). In addition, at this time, the temperature is heated to 80°C using the heating device 151, thereby promoting the curing of the adhesive.

[0162] The punching, coating, and lamination processes are repeated sequentially, and 130 single-layer iron core sheets are stacked. Between the 40 electromagnet steel sheets, the average diameter of the first bonded portion formed with quick-setting adhesive (A-1) is 5 mm. The average diameter of the second bonded portion formed with thermosetting adhesive (B-1) is 8 mm. The bonding area ratios Q0 and Q... A0 Q A1 Q A2 Q B0 Q B1 Q B2 The proportions P1 and P2 are shown in Table 1.

[0163] (Examples 2-13)

[0164] In addition to making the average diameter of the first adhesive part and the second adhesive part, the adhesive area ratio Q0, Q A0 Q A1 Q A2 Q B0 Q B1 Q B2Except for the proportions P1 and P2 shown in Tables 1 and 2, the stator core was manufactured in the same manner as in Example 1.

[0165] (Comparative Example 1)

[0166] Similar to Example 1, after applying and temporarily bonding the quick-setting adhesive (A-1) to the first surface of the teeth, the thermosetting adhesive (B-1) was vacuum impregnated to bond the metal plates together on both sides, producing the bonding area ratios Q0 and Q shown in Table 2. A0 Q A1 Q A2 Q B0 Q B1 Q B2 And the stator cores with proportions P1 and P2.

[0167] (Comparative Example 2)

[0168] In addition to using only fast-curing adhesive (A-1) and ensuring that the bonding area ratios Q0 and Q... A0 Q A1 Q A2 Q B0 Q B1 Q B2 Except for the proportions P1 and P2 shown in Table 2, the stator core was manufactured in the same manner as in Example 1.

[0169] (Comparative Example 3)

[0170] In addition to using only thermosetting adhesives (B-1) and ensuring that the bonding area ratios Q0 and Q A0 Q A1 Q A2 Q B0 Q B1 Q B2 Except for the proportions P1 and P2 shown in Table 2, the stator core was manufactured in the same manner as in Example 1.

[0171] (evaluate)

[0172] The stator cores for each example were evaluated as follows, and the results are shown in Tables 1 and 2.

[0173] <Core Strength>

[0174] After the stator core was dropped from a height of 1 meter, the number of groups of adjacent electromagnets along the stacking direction that had gaps between them was measured, and the core strength was evaluated. A gap was defined as a larger distance between the electromagnets compared to before the drop. This means that the fewer groups of electromagnets with gaps between them, the higher the core strength.

[0175] ○: The number of groups of electromagnetic steel plates that have gaps between them is less than 1. That is, it is a case where no problems have occurred with the stator core.

[0176] △: The number of groups of electromagnetic steel plates that have gaps between them is 1 or more but less than 2. That is, it is a case where a visually perceptible gap has been created in the stator core.

[0177] ×: The number of groups of electromagnetic steel plates that have gaps between them is 2 or more. That is, the case where multiple visible gaps are created or cracked in the stator core.

[0178] <Sound Test (Noise Evaluation)>

[0179] The outer periphery of the stator core back was vibrated radially using an impact hammer. Modal analysis of noise vibration was performed using the front end of the teeth and the center of the core back at a 180° axial angle relative to the vibration source as measurement points. Furthermore, for the case where the central portion of the core back was vibrated radially using an impact hammer, modal analysis of noise vibration was also performed using the front end of the teeth and the center of the core back at a 180° axial angle relative to the vibration source as measurement points. Evaluation was conducted according to the following criteria: A smaller value indicates better noise suppression.

[0180] 1: Only one to two vibration peaks were detected.

[0181] 2: Multiple vibration peaks were detected.

[0182] 3: Based on the vibration direction, more than 10 vibration peaks were detected.

[0183] 4: There is a main peak, but more than 10 vibration peaks were detected.

[0184] 5: No main peak was detected, but more than 10 vibration peaks were detected.

[0185] <Iron Loss>

[0186] Stator iron loss was measured using a rotating iron loss simulator with a rotor-shaped detector having a diameter of 133.5 mm. This rotating iron loss simulator was published in the Electrical Institute Research Papers, RM-92-79, 1992.

[0187] In the evaluation of stator core iron loss, the core used as the evaluation benchmark was constructed with eight bonding portions on the back of the core, resulting in a riveted laminated core with 10 sheets of riveted plates, each having a 1.5mm diameter rivet at the center of all teeth. Rotational iron loss simulator measurements were performed on each example of the stator core and the riveted laminated core, and the iron loss was evaluated according to the following evaluation criteria.

[0188] 〇: Compared with riveted and fixed laminated iron cores, more than 20% of the magnetism is considered good.

[0189] △: Compared with riveted and fixed laminated iron cores, the magnetism is good within the range of more than 10% and less than 20%.

[0190] ×: Regarding the improvement in magnetism, compared with riveted and fixed laminated iron cores, it is more than 0% and less than 10%.

[0191] <Productivity>

[0192] In use Figure 4 The manufacturing apparatus shown, when producing stator cores at 150 sppm (150 sheets of electromagnetic steel are stacked per minute), determines the fixation condition of the stator cores taken out of the mold and evaluates them according to the following stator standards.

[0193] 〇: Stacked iron cores can be produced without any problems.

[0194] △: In progress. Electromagnetic steel sheets are being peeled off from each other or are being stacked skewed.

[0195] ×: The electromagnet plates are not properly bonded together.

[0196] [Table 1]

[0197]

[0198] [Table 2]

[0199]

[0200] Industrial availability

[0201] According to the present invention, the productivity and mechanical strength of laminated iron cores for stators can be improved, vibration or noise of rotating electrical machines can be reduced, and iron loss can be suppressed. Therefore, it has great industrial applicability.

[0202] Explanation of reference numerals in the attached figures

[0203] 10… Rotary motor, 20… Stator, 21… Stator adhesive laminated iron core, 40… Electromagnetic steel plate, 41… Adhesive part, 41a… First adhesive part, 41b… Second adhesive part.

Claims

1. A method for manufacturing a stator with an adhesive laminated iron core, The stator adhesive laminated iron core includes: Multiple electromagnetic steel plates are stacked on top of each other, and both sides are covered with an insulating film. as well as An adhesive portion, which is disposed between adjacent electromagnetic steel plates along the stacking direction, bonds these electromagnetic steel plates together. All groups of the electromagnetic steel plates adjacent to each other along the stacking direction are bonded together by a plurality of the adhesive portions. The adhesive forming the bonded portion is a fast-curing adhesive or a thermosetting adhesive. The adhesive portion is partially provided between adjacent electromagnetic steel plates along the stacking direction. The adhesive portion includes: a first adhesive portion formed of the quick-setting adhesive; and a second adhesive portion formed of the thermosetting adhesive. The first adhesive portion is a dot-shaped part with an average diameter of 3mm to 7mm, and the second adhesive portion is a dot-shaped part with an average diameter of 5mm to 10mm. Between the aforementioned electromagnetic steel plates, relative to the total bonding area of ​​the adhesive portions, the proportion of the bonding area of ​​the first adhesive portion is 5% or more and less than 50%, and the proportion of the bonding area of ​​the second adhesive portion is 50% or more and less than 95%. The manufacturing method of the stator using a bonded laminated iron core repeats the following steps: The punching process involves punching the electromagnetic steel plate to obtain the shape of the electromagnetic steel plate having a back of iron core and multiple teeth; In the coating process, after the punching process, the quick-setting adhesive and the thermosetting adhesive are coated on a portion of the surface of the electromagnetic steel sheet; as well as In the lamination process, the electromagnetic steel plate after the coating process is overlapped and pressed onto another electromagnetic steel plate to form the adhesive part.

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