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EP-4742279-A1 - GLUING METHOD FOR STATOR LAMINATIONS OF MOTOR, STATOR CORE, AND MESH GLUING PLATE

EP4742279A1EP 4742279 A1EP4742279 A1EP 4742279A1EP-4742279-A1

Abstract

Provided are a gluing method for stator laminations (1) of a motor, a stator core, and a mesh gluing plate (4). The gluing method comprises: calculating an accurate shrinkage ratio S on the basis of the mesh number of a mesh gluing plate (4) and the viscosity of glue, wherein raised edges (13), two slot side edges (14), and slot bottom edges (15) comprised in a stator lamination (1) define a closed plane, every two opposite edges on the closed plane shrink inwards according to an original shape to form a gluing area (21), and the shrinkage distance is the distance between every two opposite edges multiplied by the shrinkage ratio S. On the one hand, since the gluing area (21) is a surface area, the glue is applied to stack and bond stator laminations (1) in a full-surface gluing mode, thereby greatly improving the bonding strength of the stator core of the motor; on the other hand, since there is a shrinkage distance between the gluing area (21) and the closest edge, the glue overflowing phenomenon caused by excessive glue can be solved, thereby greatly improving the quality of driving motors of new energy vehicles.

Inventors

  • JIA, Jihua

Assignees

  • Suzhou Shoulide Technology Co., Ltd.

Dates

Publication Date
20260513
Application Date
20240509

Claims (10)

  1. A gluing method for stator laminations of motors, wherein the method comprises following steps: S1: drawing, according to a shape of a stator lamination to be applied with adhesive, an adhesive application region capable of receiving adhesive; S2: preparing a photosensitive film having dimensions corresponding to those of the stator lamination in step S1; S3: preparing a mesh base having dimensions corresponding to those of the stator lamination in step S1; S4: preparing a mesh gluing plate corresponding to the adhesive application region in step S1; S5: placing the mesh gluing plate prepared in step S4 over the stator lamination to be applied with adhesive in step S1, and applying adhesive to the adhesive application region manually or by means of an adhesive applying machine; wherein, in step S1, the adhesive application region is arranged on a closed plane of the stator lamination to be applied with adhesive, the closed plane being composed of a yoke portion and a tooth portion, the tooth portion comprising a plurality of tooth units, each tooth unit being composed of a protruding edge, opposing tooth-slot side edges, and a tooth-slot bottom edge; a distance from an outer edge of the yoke portion to the protruding edge located on a same radius is defined as a yoke distance D, a distance between two points of the opposing tooth-slot side edges on a same circumferential line is defined as a tooth distance d, and a distance from the tooth-slot bottom edge to the outer edge of the yoke portion on the same radius is defined as a tooth-slot distance h; the outer edge of the yoke portion and the protruding edge are synchronously shrunk toward an inner closed plane of the yoke portion according to original shapes of the outer edge of the yoke portion and the protruding edge, respectively, to form an adhesive application region of the yoke portion, wherein a yoke shrinkage distance by which the outer edge of the yoke portion and the protruding edge are shrunk toward the yoke portion is ΔD, and ΔD = the yoke distance D * a shrinkage ratio S, ; adjacent edges of the opposing tooth-slot side edges and the tooth-slot bottom edge are synchronously shrunk toward a closed plane within the tooth unit according to original shapes of the respective edges to form an adhesive application region of the tooth portion, wherein a shrinkage distance by which the opposing tooth-slot side edges are shrunk toward the adhesive application region of the tooth portion is Δd, and Δd = tooth distance d * the shrinkage ratio S, , and a shrinkage distance by which the tooth-slot bottom edge is shrunk toward the adhesive application region of the tooth portion is Δh, and Δh = the tooth-slot distance h * the shrinkage ratio S; the adhesive application region of the yoke portion and the adhesive application region of the tooth portion together constitute the adhesive application region on the stator lamination capable of receiving adhesive; and on the closed plane of the stator lamination, regions other than the adhesive application region are non-adhesive application regions;in step S4, the preparation of the mesh gluing plate comprises: first applying, onto the mesh base, a liquid material capable of being cured under light irradiation or thermal radiation; then covering the liquid material with the photosensitive film, and curing the liquid material by photosensing, exposure, or thermal radiation; cured liquid material blocking corresponding meshes of the mesh base to form adhesive-blocking regions that are incapable of allowing adhesive to pass therethrough, the adhesive-blocking regions corresponding to the non-adhesive application regions on the stator lamination; and finally removing uncured liquid material from the mesh base such that unblocked meshes form adhesive-permeable regions capable of allowing adhesive to pass therethrough, the adhesive-permeable regions corresponding to the adhesive application regions on the stator lamination, whereby the mesh gluing plate is formed after the adhesive-permeable regions and the adhesive-blocking regions are produced on the mesh base.
  2. The gluing method for stator laminations of motors according to claim 1, wherein, before drawing the adhesive application region in step S1, the method further comprises calculating a shrinkage ratio S of the adhesive according to a viscosity of the selected adhesive and a mesh count of the mesh base, and wherein the shrinkage ratio S is proportional to the mesh count of the mesh base and the viscosity of the adhesive.
  3. The gluing method for stator laminations of motors according to claim 2, wherein, under a condition that a product of the mesh count of the selected mesh base and the viscosity of the adhesive is greater than 160,000, the shrinkage ratio S is calculated as follows: shrinkage ratio S = 100 − mesh count of the selected mesh base 500 × adhesive viscosity 10000 ÷ 4 × 1 %
  4. The adhesive applying method for motor stator lamination according to claim 2, wherein, under a condition that a product of the mesh count of the selected mesh base and the viscosity of the adhesive is less than or equal to 160,000, the shrinkage ratio S is calculated as follows: shrinkage ratioS = 100 − mesh count of the selected mesh base 500 × adhesive viscosity 10000 ÷ adhesive viscosity × mesh count of the selected mesh base 40000 × 1 %
  5. The gluing method for stator laminations of motors according to any one of claims 1 to 4, wherein, in step S2, a preparation method of the photosensitive film comprises: forming light-permeable and heat-permeable regions and mask regions on a substrate of the photosensitive film, wherein shapes of the light-permeable and heat-permeable regions correspond to the non-adhesive application regions drawn in step S1, and shapes of the mask regions correspond to the adhesive application regions drawn in step S1.
  6. The gluing method for stator laminations of motors according to any one of claims 1 to 5, wherein, in step S4, after curing the liquid material, the mesh gluing plate forms adhesive-blocking regions and adhesive-permeable regions, wherein shapes of the adhesive-blocking regions correspond to the non-adhesive application regions drawn in step S1, and shapes of the adhesive-permeable regions correspond to the adhesive application regions drawn in step S1.
  7. A stator core for motor, wherein the stator core is prepared by laminating and bonding stator laminations using the gluing methodfor stator lamination according to any one of claims 1 to 6.
  8. A for applying adhesive to motor stator lamination, wherein the mesh gluing plate comprises adhesive-blocking regions and adhesive-permeable regions, the adhesive-blocking regions being formed by applying a liquid material and blocking meshes under light curing or thermal curing, wherein shapes of the adhesive-blocking regions correspond to non-adhesive application regions of the stator lamination, and shapes of the adhesive-permeable regions correspond to adhesive application regions of the stator lamination.
  9. A method for preparing a mesh gluing plate for applying adhesive to motor stator lamination, wherein the method comprises: applying, onto a mesh base, a liquid material capable of being cured under light irradiation or thermal radiation; covering the liquid material with a photosensitive film having dimensions corresponding to those of the stator lamination, such that after curing, the liquid material blocks corresponding meshes of the mesh base to form adhesive-blocking regions that are incapable of allowing adhesive to pass therethrough, wherein shapes of the adhesive-blocking regions correspond to non-adhesive application regions on the stator lamination; and removing uncured liquid material from the mesh base, such that unblocked meshes form adhesive-permeable regions capable of allowing adhesive to pass therethrough, wherein shapes of the adhesive-permeable regions correspond to adhesive application regions on the stator lamination.
  10. The method for preparing a mesh gluing plate for applying adhesive to motor stator lamination according to claim 9, wherein the photosensitive film comprises light-permeable and heat-permeable regions and mask regions, wherein shapes of the light-permeable and heat-permeable regions correspond to non-adhesive application regions of the stator lamination, and shapes of the mask regions correspond to adhesive application regions of the stator lamination.

Description

TECHNICAL FIELD The present application relates to the technical field of laminated adhesive application for motor stator lamination, and in particular to a gluing method for stator laminations of motors. BACKGROUND At present, new energy vehicles are gradually replacing traditional fuel-powered vehicles due to advantages such as environmental friendliness in charging and low operating costs. The performance level and pricing of new energy vehicles are largely determined by their drive motors. In order to improve the operating efficiency of drive motors and reduce motor noise, it is necessary to further enhance the overall quality of the motor. Among the various motor components, the stator core is a key structure affecting the overall motor quality, and the structural quality of the stator core depends on the lamination and bonding process of the stator laminations. Only by further improving the lamination bonding process can a quieter and more comfortable driving experience for new energy vehicles be achieved. In the prior art, during the bonding and processing of stator cores, due to the complex shapes of stator laminations in drive motors for new energy vehicles and the narrow bonding surface areas between adjacent laminations, dispensing is predominantly adopted in practical bonding processes to laminate and bond stator laminations or rotor laminations. However, compared with full-surface adhesive application, such dispensing applies a relatively small amount of adhesive, resulting in insufficient bonding strength of the laminated stator core, thereby adversely affecting the overall quality of the motor. To address the issue that an insufficient amount of adhesive affects the overall strength of the motor, those skilled in the art have considered bonding stator laminations by applying adhesive in a full-surface manner. Although this approach can improve bonding strength by increasing the amount of adhesive, in practice it is difficult to accurately match an appropriate adhesive amount to the bonding regions. Moreover, it is also difficult to precisely control the adhesive-coated area and the coating position during application. Simply increasing the adhesive amount tends to cause adhesive overflow during laminating the stator lamination, which in turn adversely affects the quality of the motor. Similarly, existing adhesive applying methods for motor rotor laminations suffer from the same problems as those for stator laminations, namely, insufficient bonding strength caused by an inadequate amount of adhesive on the one hand, and adhesive overflow resulting from an excessive amount of adhesive on the other hand. SUMMARY A first objective of the present application is to provide an gluing method for stator laminations of motors, which can not only address the technical problem of insufficient bonding reliability of a stator core caused by an inadequate amount of adhesive, but also eliminate adhesive overflow resulting from an excessive amount of adhesive. By enabling precise adhesive application on stator laminations, the method significantly improves the quality of drive motors for new energy vehicles. A second objective of the present application is to provide a stator core for a motor, which is prepared by laminating and bonding stator laminations using the above adhesive-applying method. The stator core thus obtained has high bonding strength without adhesive overflow, thereby exhibiting high product quality. A third objective of the present application is to provide a mesh-type adhesive coating plate for applying adhesive to motor stator lamination, as well as a preparation method thereof. The mesh-type adhesive coating plate is provided with blocked regions and adhesive-permeable regions, and can be used in cooperation with the above adhesive-applying method to facilitate precise adhesive application on stator laminations. To achieve the above objectives, the present application provides the following technical solutions. In a first aspect, the present application provides an adhesive-applying method for motor stator lamination, comprising the following steps: S1: drawing, according to a shape of a stator lamination to be applied with adhesive, an adhesive application region capable of being applied with adhesive. wherein, in step S1, the adhesive application region is arranged on a closed plane of the stator lamination to be applied with adhesive, the closed plane being composed of a yoke portion and a tooth portion, the tooth portion comprising a plurality of tooth units, each tooth unit being composed of a protruding edge, opposing tooth-slot side edges, and a tooth-slot bottom edge; a distance from an outer edge of the yoke portion to the protruding edge located on a same radius is defined as a yoke distance D, a distance between two points of the opposing tooth-slot side edges on a same circumferential line is defined as a tooth distance d, and a distance from the tooth-slot bottom edge to the