Strengthening method of motor silicon steel sheet and silicon steel sheet laminated structure

Abstract

The invention discloses a motor silicon steel sheet strengthening method and a silicon steel sheet laminated structure, and the motor silicon steel sheet strengthening method comprises the following steps: providing a silicon steel sheet laminated structure which comprises a plurality of silicon steel sheets which are aligned and laminated with each other; and rotating the silicon steel sheet laminated structure. And when the silicon steel sheet laminated structure rotates, the liquid adhesive is output to the upper surface of the uppermost silicon steel sheet of the silicon steel sheet laminated structure at a first position in the rotation direction of the silicon steel sheet laminated structure. And when the silicon steel sheet laminated structure rotates, blowing air to the liquid adhesive at a second position in the rotation direction of the silicon steel sheet laminated structure, so that the liquid adhesive is concentrated towards the stator tooth boot part of the uppermost silicon steel sheet of the silicon steel sheet laminated structure. And when the silicon steel sheet laminated structure rotates, blowing air to the liquid adhesive at a third position in the rotation direction of the silicon steel sheet laminated structure, so that the liquid adhesive flows downwards along the stator tooth boot part of the uppermost silicon steel sheet of the silicon steel sheet laminated structure.

Description

Technical Field

[0001] The present invention relates to a strengthening method for motor silicon steel sheets and a silicon steel sheet stacking structure, and in particular to a glue-coating strengthening method for preventing motor silicon steel sheets from warping and a glue-coating strengthened silicon steel sheet stacking structure. Background Art

[0002] In order to reduce manufacturing time and cost, it is known that stator silicon steel sheets are usually punched out with anchor points in specific areas for each silicon steel sheet during the stamping process, and then the silicon steel sheets are stamped and formed in a continuous stamping sequence. Subsequently, the silicon steel sheets are stacked layer by layer into a stator or rotor according to the required quantity, weight or stacking rate. After stacking, the stator or rotor is welded on the outer diameter to fix it. Compared with the process of gluing silicon steel sheets, this welding and fixing process only fixes specific areas, so it is impossible to completely protect the stator or rotor from deformation or even warping due to thermal stress release and external force in the post-process, which will indirectly cause additional cost increase. At present, the finished stator silicon steel sheet products cannot avoid the application of external force to the silicon steel sheet in the post-process (such as insulation paper insertion or copper wire insertion, etc.) due to the equipment of external mechanical components, which will cause internal stress and thermal stress release to the stator or rotor silicon steel sheet, resulting in deformation or warping of the first few sheets at the top and the last few sheets at the bottom of the stator silicon steel sheet stacking structure. Summary of the invention

[0003] In order to reduce manufacturing time and cost, it is known that stator silicon steel sheets are usually punched out with anchor points in specific areas for each silicon steel sheet during the stamping process, and then the silicon steel sheets are stamped and formed in a continuous stamping sequence. Subsequently, the silicon steel sheets are stacked layer by layer into a stator or rotor according to the required quantity, weight or stacking rate. After stacking, the stator or rotor is welded on the outer diameter to fix it. Compared with the process of gluing silicon steel sheets, this welding and fixing process only fixes specific areas, so it is impossible to completely protect the stator or rotor from deformation or even warping due to thermal stress release and external force in the post-process, which will indirectly cause additional cost increase. At present, the finished stator silicon steel sheet products cannot avoid the application of external force to the silicon steel sheet in the post-process (such as insulation paper insertion or copper wire insertion, etc.) due to the equipment of external mechanical components, which will cause internal stress and thermal stress release to the stator or rotor silicon steel sheet, resulting in deformation or warping of the first few sheets at the top and the last few sheets at the bottom of the stator silicon steel sheet stacking structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0004] In order to make the above and other objects, features, advantages and embodiments of the present invention more clearly understood, the accompanying drawings are described as follows:

[0005] Figure 1 is a schematic diagram illustrating a glue coating system according to some embodiments of the present invention;

[0006] Figure 2is a schematic diagram illustrating a process of gluing a motor silicon steel sheet using a gluing system according to some embodiments of the present invention;

[0007] Figure 3 The invention is a method for coating a motor silicon steel sheet according to some embodiments of the present invention;

[0008] Figure 4 is a cross-sectional schematic diagram illustrating the positional relationship between a colloid output device and a silicon steel sheet stacking structure of a glue coating system according to some embodiments of the present invention;

[0009] Figure 5 is a cross-sectional schematic diagram illustrating the positional relationship between an airflow output device and a silicon steel sheet stacking structure of a glue coating system according to some embodiments of the present invention;

[0010] Figure 6 is a cross-sectional schematic diagram illustrating the positional relationship between another airflow output device and a silicon steel sheet stacking structure of a glue coating system according to some embodiments of the present invention; and

[0011] Figure 7 Schematic cross-sectional views of the stacked structure of silicon steel sheets according to some embodiments of the present invention are shown.

[0012]

Explanation of symbols

[0013] 100: Gluing system

[0014] 102: Exhaust hood

[0015] 104: Lifting mechanism

[0016] 106: Colloid output device

[0017] 106a: output pipe or nozzle

[0018] 108: Airflow output device

[0019] 108a: Nozzle

[0020] 110: Airflow output device

[0021] 110a: Nozzle

[0022] 112: Carrier board

[0023] 114: Rotating Platform

[0024] 116:Servo motor

[0025] 118: Controller

[0026] 150: Silicon steel sheet stacking structure

[0027] 150a: Silicon steel sheet

[0028] 150b: Upper surface

[0029] 150c: End face

[0030] 151: Liquid adhesive

[0031] 151a: Adhesive layer

[0032] 152: stator teeth

[0033] 154: Boots

[0034] 154a: End face

[0035] 156:Ontology

[0036] H: Height

[0037] h1: distance

[0038] h2: distance

[0039] CD: Direction of rotation

[0040] RD: Radial

[0041] AD: Axial

[0042] A1: Angle

[0043] A2: Angle

[0044] 300: Methods

[0045] S302: Step

[0046] S304: Steps

[0047] S306: Steps

[0048] S308: Steps

[0049] S310: Step

[0050] S312: Steps

[0051] S314: Steps

[0052] S316: Steps DETAILED DESCRIPTION

[0053] In order to make the description of the present invention more detailed and complete, reference may be made to the attached drawings and various embodiments described below, in which the same numbers represent the same or similar elements. On the other hand, well-known elements and steps are not described in the embodiments to avoid unnecessary limitations on the present invention. In the embodiments and claims, unless the text specifically limits the articles, "a", "an" and "the" may refer to one or more.

[0054] Please refer to Figure 1 , which depicts a schematic diagram of a glue coating system of some embodiments of the present invention. The glue coating system 100 includes an exhaust hood 102, a lifting mechanism 104, a colloid output device 106, an airflow output device 108, an airflow output device 110, a carrier plate 112, a rotating platform 114, a servo motor 116, and a controller 118. The glue coating system 100 is used to perform a glue coating process on a silicon steel sheet stacking structure 150. The exhaust hood 102 is used to remove volatile gases generated during the glue coating process. The colloid output device 106, the airflow output device 108, and the airflow output device 110 are all fixed on the lifting mechanism 104 to control the distance between the above three devices and the silicon steel sheet stacking structure 150. The carrier plate 112 is mounted on the rotating platform 114 to carry and fix the silicon steel sheet stacking structure 150 to achieve the purpose of centering rotation. When the rotating platform 114 rotates, the carrier plate 112 and the silicon steel sheet stacking structure 150 can be driven to rotate together. The shaft of the servo motor 116 is connected to the rotating platform 114 to provide a power source for rotation. The controller 118 is electrically connected to the colloid output device 106, the airflow output device 108, the airflow output device 108 and the servo motor 116 to control the colloid or airflow output speed or rotation speed of the above four devices.

[0055] Please also refer to Figure 1 , 2 , Figure 2 A schematic diagram of a glue coating process for motor silicon steel sheets using a glue coating system according to some embodiments of the present invention is shown. When the rotating platform 114 of the glue coating system 100 drives the silicon steel sheet stacking structure 150 to rotate, the glue coating process of the motor silicon steel sheets can be performed using the glue output device 106, the airflow output device 108 and the airflow output device 110. The glue output device 106 includes an output pipe or a nozzle 106a to output liquid adhesive to the upper surface of the uppermost silicon steel sheet 150a of the silicon steel sheet stacking structure 150. In an embodiment of the present invention, the silicon steel sheet stacking structure 150 includes a plurality of silicon steel sheets 150a of the same shape aligned and stacked with each other, and the silicon steel sheet stacking structure 150 can be the body of a motor stator or a motor rotor. In an embodiment of the present invention, when applied to a motor rotor body, each of these silicon steel sheets has a plurality of magnet grooves, and when stacked, these magnet grooves corresponding to each layer of silicon steel sheets are partially offset from each other along the axial direction to improve the magnetic performance. Figure 2Only the stacked structure of silicon steel sheets of the motor stator is illustrated, and is not intended to limit the present invention. When the stacked structure of silicon steel sheets 150 and the carrier plate 112 are driven by the rotating platform 114 to rotate along the rotation direction CD, the output pipe or the nozzle 106a can be used to output the liquid adhesive to the upper surface of the uppermost silicon steel sheet 150a in a dripping or spraying manner. In an embodiment of the present invention, each stator silicon steel sheet includes an annular body 156, and a plurality of stator teeth 152 are arranged at intervals from the inner edge of the body 156 and extend radially toward the center of the circle, that is, the center of the motor, and surround the inner edge of the body 156. A pair of boots 154 are provided on the edge of each stator tooth 152 near the center of the circle, and the outer edge of the body 156 defines the outer edge of the stator.

[0056] Please continue to refer to Figure 1 , 2 When the glue coating system is in operation, the silicon steel sheet stacking structure 150 is driven by the carrier plate 112 to rotate along the rotation direction CD at a speed range of 1rpm to 300rpm. The rotation speed of the silicon steel sheet stacking structure 150 should match the dripping or spraying speed of the liquid adhesive 151 and the concentration of the liquid adhesive 151, so as to output an appropriate amount of liquid adhesive 151 on the silicon steel sheet to save the amount of liquid adhesive 151 and control the curing time of the liquid adhesive 151. The airflow output device 108 includes a nozzle 108a and is located at a position different from the output pipe or nozzle 106a. When the silicon steel sheet stacking structure 150 rotates, after dripping or spraying the liquid adhesive 151, it is used to blow air or wind to the liquid adhesive 151 provided on the upper surface of the uppermost silicon steel sheet 150a, so that the liquid adhesive 151 is concentrated toward one side of the uppermost silicon steel sheet 150a of the silicon steel sheet stacking structure 150 (for example, concentrated toward any position between the stator tooth 152 and the boot 154, or concentrated toward any position between the stator tooth 152 and the outer edge of the stator). The airflow output device 110 includes another nozzle 110a and is located at a position different from the nozzle 108a and the output pipe or nozzle 106a. When the silicon steel sheet stacking structure 150 rotates and after the liquid adhesive 151 is concentrated on one side of the uppermost silicon steel sheet 150a, it is used to blow air or wind to the liquid adhesive so that the liquid adhesive is concentrated along the radial inner edge of the uppermost silicon steel sheet 150a of the silicon steel sheet stacking structure 150 (i.e., the aforementioned side) and flows downward in the axial direction (for example, flows downward along the end surface of the boot portion 154 of the stator tooth 152 facing the center of the circle, or flows downward along the side surface between adjacent stator teeth 152). When the liquid adhesive 151 flows downward, it can penetrate or fill the multiple gaps between the adjacent silicon steel sheets stacked up and down in the axial direction to form multiple adhesive layers 151a (see Figure 7), and after the liquid adhesive 151 is cured, the purpose of strengthening the bonding and consolidation of the multi-layer silicon steel sheet is achieved to avoid the warping of the silicon steel sheet. In an embodiment of the present invention, the output pipe or nozzle 106a, the nozzle 108a and the nozzle 110a are respectively located at three different positions on the rotation direction CD of the silicon steel sheet stacking structure, so that the liquid adhesive 151 can be dripped or sprayed on the surface of the silicon steel sheet after being output through the output pipe or nozzle 106a, and then the liquid adhesive 151 is evenly pushed to different positions required by the silicon steel sheet stacking structure 150 through the blowing or air blowing of the nozzle 108a and the nozzle 110a, that is, respectively concentrated to a specific position and flow downward from the specific position. The configuration such as the spacing between the output pipe or nozzle 106a, the nozzle 108a and the nozzle 110a can be adjusted according to the size and rotation speed of the silicon steel sheet stacking structure 150. In an embodiment of the present invention, the viscosity coefficient of the liquid adhesive should be less than 20cP (centipoise) to facilitate blowing or air blowing. In an embodiment of the present invention, the blowing pressure of the nozzles 108a and 110a can be adjusted by the controller 118. The pressure is, for example, less than 10 MPa to prevent the liquid adhesive from being blown off the surface of the silicon steel sheet due to excessive pressure.

[0057] Please also refer to Figure 1 , 2 , 3, Figure 3 A method 300 for coating motor silicon steel sheets according to some embodiments of the present invention is illustrated. In step S302 of method 300, a silicon steel sheet stacking structure 150 is provided for coating in a coating system 100. The silicon steel sheet stacking structure 150 includes a plurality of silicon steel sheets 150a of the same shape aligned and stacked with each other. In an embodiment of the present invention, when applied to a motor rotor body, each of these silicon steel sheets has a plurality of magnet grooves, and when stacked, these magnet grooves corresponding to each layer of silicon steel sheets are partially offset from each other along the axial direction to improve the magnetic performance. Next, in step S304 of method 300, a rotating platform 114 and a carrier plate 112 are used to rotate the silicon steel sheet stacking structure 150 at a certain speed. In an embodiment of the present invention, a controller 118 electrically connected to a servo motor 116 is used to control the silicon steel sheet stacking structure 150 to rotate at a constant speed within a speed range of 1 rpm to 300 rpm, so that the rotation speed of the silicon steel sheet stacking structure 150 and the dripping or spraying speed of the liquid adhesive can match each other, thereby achieving a better adhesive coating effect and controlling the amount of the liquid adhesive 151. In step S306 of the method 300, when the silicon steel sheet stacking structure 150 rotates, the output pipe or nozzle 106a of the colloid output device 106 is used at a first position in the rotation direction CD of the silicon steel sheet stacking structure 150 to output a liquid adhesive 151 to the upper surface 150b of the uppermost silicon steel sheet 150a of the silicon steel sheet stacking structure 150 in a dripping or spraying manner (see Figure 4). In the embodiment of the present invention, the first position is any position between the boot 154 and the stator tooth 152 in the radial direction. In other embodiments of the present invention, the first position may also be any position between the inner edge of the body 156 intersecting the stator tooth 152 and the outer side of the body 156 in the radial direction. In the embodiment of the present invention, the liquid adhesive 151 may be a quick-drying adhesive or an instant adhesive, and its viscosity coefficient should be less than 20 cP (centipoise) so that the flow and distribution of the liquid adhesive can be easily controlled by blowing air or blowing. In step S308 of the method 300, when the silicon steel sheet stack structure 150 rotates and the liquid adhesive 151 is provided on the surface of the silicon steel sheet, the nozzle 108a of the air flow output device 108 is used to blow air to the liquid adhesive 151 at a second position in the rotation direction CD of the silicon steel sheet stack structure 150 at a first angle, so that the liquid adhesive 151 is concentrated toward one side of the uppermost silicon steel sheet 150a of the silicon steel sheet stack structure 150 (see Figure 5 , for example, concentrated along the radial direction RD toward the side of the boot portion 154 of the stator tooth 152). In step S310 of the method 300, when the silicon steel sheet stacking structure 150 rotates, and after the liquid adhesive 151 is concentrated on one side of the uppermost silicon steel sheet 150a, the nozzle 110a of the airflow output device 110 is used to blow air toward the liquid adhesive 151 at a second angle at a third position in the rotation direction CD of the silicon steel sheet stacking structure 150, so that the liquid adhesive 151 flows downward along the side of the uppermost silicon steel sheet of the silicon steel sheet stacking structure 150 (see Figure 6 , for example, flowing downward along the end surface 154a of the boot 154). In an embodiment of the present invention, step S308 can also concentrate the liquid adhesive 151 on the side edge of the stator tooth 152, and in step S310, the liquid adhesive 151 flows downward along the side between adjacent stator teeth 152. Steps S304, S306, S308, and S310 are performed until the inner circle area of ​​the inner diameter of the boot 154 in the entire circumferential direction is fully coated with adhesive, or the specific side positions between the stator teeth 152 are fully coated with adhesive. In addition, the use of the adhesive coating system 100 can coat the gaps between the silicon steel sheets of the silicon steel sheet stacking structure 150 that are closer to the two end surfaces 150c of the silicon steel sheet stacking structure 150, thereby strengthening the silicon steel sheet stacking structure 150 and preventing the silicon steel sheets from warping.

[0058] Please continue to refer to Figure 3 To achieve a better strengthening effect, the embodiment of the present invention further includes a step S314 of flipping the silicon steel sheet stacking structure 150 after step S310, so that the other end of the silicon steel sheet stacking structure 150 along the axial direction AD faces upward (see Figure 7), and the other end of the silicon steel sheet stacking structure 150 is again subjected to steps S304, S306, S308, and S310 in sequence until the inner diameter area of ​​the boot portion 154 in the entire circumferential direction is coated with glue, or the specific side positions between the stator teeth 152 are coated with glue. Furthermore, before the step S314 of flipping the silicon steel sheet stacking structure 150 and after the step S310 of allowing the liquid adhesive 151 to flow downward, the step S312 of leaving the silicon steel sheet stacking structure 150 to stand for a period of time to solidify the liquid adhesive 151 is included. The standing time can be 1 to 300 minutes, which can be adjusted according to the viscosity coefficient of the liquid adhesive 151, the coating thickness, the coating range, the temperature and humidity of the operating environment, etc. Furthermore, in an embodiment of the present invention, in order to further strengthen the structure, after the two-sided glue coating of the silicon steel sheet stacking structure 150 is completed in step S314, a strengthening step S316 can be added, and a laser welding is applied to the upper surface of the uppermost silicon steel sheet 150a at both ends of the silicon steel sheet stacking structure 150, so that the uppermost silicon steel sheets at both ends are tightly combined with each other after being heated and melted, forming other strengthening structures other than glue coating, and further avoiding the warping of the silicon steel sheet. The position where the laser welding is applied is located at the third position or adjacent to the third position, for example, laser welding is applied along the end face of the boot 154, which is not intended to limit the present invention. It should be noted that the aforementioned steps S3212, S314 and S316 can be selectively implemented as needed to achieve a better strengthening effect.

[0059] Please refer to Figure 4 , which is a cross-sectional schematic diagram of the positional relationship between a colloid output device and a silicon steel sheet stacking structure of a glue coating system according to some embodiments of the present invention. The colloid output device 106 includes an output pipe or nozzle 106a. When the silicon steel sheet stacking structure 150 rotates, the output pipe or nozzle 106a is used to output liquid adhesive 151 on the upper surface 150b of the uppermost silicon steel sheet 150a of the silicon steel sheet stacking structure 150 in a dripping or spraying manner. The position of the output pipe or nozzle 106a vertically projected on the upper surface 150b of the uppermost silicon steel sheet 150a is at any position between the end face 154a of the boot 154 in the radial direction RD, and the outer edge of the silicon steel sheet in the radial direction. In an embodiment of the present invention, the position of the output pipe or nozzle 106a vertically projected on the upper surface 150b of the uppermost silicon steel sheet 150a is at any position of the boot 154 in the radial direction RD, that is, between the end face 154a and the edge of the stator tooth 152.

[0060] Please also refer to Figure 2 , 5 , Figure 5A schematic cross-sectional view of the positional relationship between an airflow output device and a silicon steel sheet stacking structure of a glue coating system according to some embodiments of the present invention is depicted. The airflow output device 108 includes a nozzle 108a. In the circumferential direction of the silicon steel sheet stacking structure 150, the nozzle 108a is located at a position different from the output pipe or nozzle 106a. Therefore, when the silicon steel sheet stacking structure 150 rotates along the rotation direction CD, the output pipe or nozzle 106a first outputs the liquid adhesive 151 to the upper surface 150b of the uppermost silicon steel sheet 150a of the silicon steel sheet stacking structure 150, and then the nozzle 108a blows air or wind toward the liquid adhesive 151, so that the liquid adhesive 151 is concentrated toward one side of the uppermost silicon steel sheet 150a of the silicon steel sheet stacking structure 150 (for example, concentrated toward the side of the boot 154 of the stator tooth 152 along the radial direction RD, or concentrated along the side of the stator tooth 152). In the embodiment of the present invention, the angle A1 between the nozzle 108a and the upper surface 150b of the uppermost silicon steel sheet 150a of the silicon steel sheet stacking structure 150 is in the range of 0 to 90 degrees. The angle A1 is preferably 50 degrees.

[0061] Please also refer to Figure 2 , 6 , Figure 6 A cross-sectional schematic diagram is shown of the positional relationship between another airflow output device of the glue coating system and the silicon steel sheet stacking structure according to some embodiments of the present invention. The airflow output device 110 includes another nozzle 110a. In the circumferential direction of the silicon steel sheet stacking structure 150, the nozzle 110a is located at a position different from the output pipe or nozzle 106a, and also at a position different from the nozzle 108a. Therefore, when the silicon steel sheet stacking structure 150 rotates along the rotation direction CD, the output pipe or nozzle 106a first outputs the liquid adhesive 151 to the upper surface 150b of the uppermost silicon steel sheet 150a of the silicon steel sheet stacking structure 150, and then the nozzle 108a blows air or wind toward the liquid adhesive 151, so that the liquid adhesive 151 is concentrated toward one side of the uppermost silicon steel sheet 150a of the silicon steel sheet stacking structure 150 (for example, along the radial direction RD toward the side of the boot 154 of the stator tooth 152). The nozzle 110a blows air toward the liquid adhesive 151, causing the liquid adhesive 151 to flow downward along the side of the topmost silicon steel sheet 150a of the silicon steel sheet stacking structure 150 (for example, flowing downward along the end surface 154a of the boot 154, or flowing downward along the side between adjacent stator teeth 152), so that the liquid adhesive 151 flows downward and can penetrate or fill the gaps between several adjacent silicon steel sheets 150a stacked up and down. In an embodiment of the present invention, the angle A2 between the direction of the nozzle 110a toward the topmost silicon steel sheet 150a of the silicon steel sheet stacking structure 150 and the upper surface 150b of the topmost silicon steel sheet 150a of the silicon steel sheet stacking structure 150 ranges from 90 degrees to 180 degrees. The angle A2 is preferably 100 degrees.

[0062] Please refer to Figure 7 , which depicts a schematic cross-sectional view of a silicon steel sheet stacking structure according to some embodiments of the present invention. This figure depicts a silicon steel sheet stacking structure 150 after glue coating and strengthening. The silicon steel sheet stacking structure 150 comprises a plurality of silicon steel sheets 150a of the same shape aligned and stacked with each other. In an embodiment of the present invention, when applied to a motor rotor body, each of these silicon steel sheets has a plurality of magnet slots, and when stacked, these magnet slots corresponding to each layer of silicon steel sheets are partially offset from each other along the axial view to improve magnetic performance. Figure 7 The embodiment shown takes the motor stator as an example, and the silicon steel sheet stacking structure 150 has a height H along the axial direction AD and two upper and lower end faces 150c. After the silicon steel sheet stacking structure 150 is glued by the aforementioned method, not all gaps between the silicon steel sheets 150a are glued and have an adhesive layer 151a after curing, but multiple gaps between several silicon steel sheets within the vertical distance h1 and the distance h2 respectively calculated from the two end faces 150c along the axial direction to the middle of the silicon steel sheet stacking structure 150 have an adhesive layer 151a. In the embodiment of the present invention, the distance h1 is equal to one-fourth of the height H, and the distance h2 is equal to one-fourth of the height H. In the embodiment of the present invention, the distance h1 and the distance h2 may also be unequal. These adhesive layers 151a respectively bond and consolidate several silicon steel sheets 150a stacked up and down that are closer to the two end faces 150c, so that the rigidity of these silicon steel sheets 150a is improved, and the silicon steel sheet stacking structure 150 is prevented from deformation or warping. Although this figure shows that the silicon steel sheet stacking structure 150 is applied as a motor stator, it does not exclude that the silicon steel sheet stacking structure 150 is applied as the aforementioned motor rotor, and the method and structure of the present invention are not limited thereto. In some embodiments of the present invention, in addition to forming the adhesive layer 151a by coating to strengthen the structure, the aforementioned nozzle 110a may also be used to blow air to the liquid adhesive 151 or a position adjacent thereto (see Figure 6 ) laser welding is applied to melt several silicon steel sheets 150a closer to the two end faces 150c to further strengthen the structure and prevent the silicon steel sheets from warping.

[0063] In summary, the strengthening method of the motor silicon steel sheet of the present invention does not use a mold to apply glue to the entire silicon steel sheet stacking structure, but uses the glue coating system of the present case to apply glue to a part of the silicon steel sheet stacking structure, so that the several silicon steel sheets above and below the local position are bonded and consolidated, preventing the silicon steel sheet stacking structure from deformation or warping.

[0064] Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the definition of the attached claims.

Claims

1. A method for strengthening a motor silicon steel sheet, characterized in that: Contains steps: (A) providing a silicon steel sheet stacking structure, wherein the silicon steel sheet stacking structure comprises a plurality of silicon steel sheets aligned and stacked with each other; (B) rotating the silicon steel sheet stack structure at a speed; (C) when the silicon steel sheet stacking structure rotates, a liquid adhesive is outputted to an upper surface of an uppermost silicon steel sheet of the silicon steel sheet stacking structure at a first position in a rotation direction of the silicon steel sheet stacking structure; (D) when the silicon steel sheet stacking structure rotates, blowing air toward the liquid adhesive at a first angle at a second position in the rotation direction of the silicon steel sheet stacking structure, so that the liquid adhesive is concentrated toward a boot portion of a stator tooth of the uppermost silicon steel sheet of the silicon steel sheet stacking structure; and (E) When the silicon steel sheet stacking structure rotates, air is blown toward the liquid adhesive at a second angle at a third position in the rotation direction of the silicon steel sheet stacking structure, so that the liquid adhesive flows downward along the end surface of the boot portion of the stator tooth of the topmost silicon steel sheet of the silicon steel sheet stacking structure facing the center of the circle.

2. The strengthening method according to claim 1, characterized in that: The liquid adhesive output in the step (C) has a viscosity coefficient less than 20 cP (centipoise).

3. The strengthening method according to claim 1, characterized in that: The step (C) includes dripping the liquid adhesive with an output pipe, or spraying the liquid adhesive with a nozzle.

4. The strengthening method according to claim 1, characterized in that: The step (D) includes using a first nozzle to blow air, wherein the first nozzle is directed toward a direction of the topmost silicon steel sheet of the silicon steel sheet stacking structure, and the first angle between the first nozzle and the upper surface of the topmost silicon steel sheet of the silicon steel sheet stacking structure is in a range of 0 degrees to 90 degrees.

5. The strengthening method according to claim 4, characterized in that: The step (E) includes using a second nozzle to blow air, wherein the second nozzle is directed toward a direction of the topmost silicon steel sheet of the silicon steel sheet stacking structure, and the second angle between the second nozzle and the upper surface of the topmost silicon steel sheet of the silicon steel sheet stacking structure is in a range of 90 degrees to 180 degrees.

6. The strengthening method according to claim 5, characterized in that: The blowing pressure of the first nozzle in the step (D) or the second nozzle in the step (E) is less than 10 MPa.

7. The strengthening method according to claim 1, characterized in that: The first position in the step (C) is any position between the shoe portion and the stator tooth along a radial direction of the motor stator.

8. The strengthening method according to claim 1, characterized in that: The motor stator in step (C) has a body, the stator teeth are connected to an inner edge of the body, and the first position is any position between the inner edge of the body and the outer edge of the silicon steel sheet along a radial direction of the motor stator.

9. The strengthening method according to claim 1, characterized in that: The speed of rotating the silicon steel sheet stacking structure in step (B) is in the range of 1 rpm to 300 rpm.

10. The strengthening method according to claim 1, characterized in that: The step (E) also includes a step (F): flipping the silicon steel sheet stacking structure so that the other end of the silicon steel sheet stacking structure along an axial direction faces upward, and performing steps (B), (C), (D), and (E) again on the other end of the silicon steel sheet stacking structure.

11. The strengthening method according to claim 10, characterized in that: After step (E) and before step (F), the method further comprises step (G): leaving the silicon steel sheet stacking structure to stand for a period of time to solidify the liquid adhesive, the period of time being 1 to 300 minutes.

12. The strengthening method according to claim 10, characterized in that: The step (F) also includes a step (H) after which a laser welding is applied to the upper surface of the uppermost silicon steel sheet of the silicon steel sheet stacking structure to tightly bond the uppermost silicon steel sheets, wherein a position where the laser welding is applied is adjacent to the third position.

13. A silicon steel sheet stacking structure, characterized in that: It comprises a plurality of silicon steel sheets aligned and stacked with each other, wherein the plurality of silicon steel sheets have a height H and two end faces along an axial direction, and the gaps between several silicon steel sheets along the axial direction within a quarter of the H distance from the two end faces all have an adhesive layer, wherein the adhesive layer is provided by providing a liquid adhesive to an upper surface of an uppermost silicon steel sheet of the silicon steel sheet stacking structure when the silicon steel sheet stacking structure is rotated, blowing air toward the liquid adhesive on the upper surface so that the liquid adhesive is concentrated toward a boot portion of a stator tooth of the uppermost silicon steel sheet of the silicon steel sheet stacking structure, and then blowing air toward the liquid adhesive on the upper surface so that the liquid adhesive flows downward to the quarter of the H distance on the end surface of the boot portion of the stator tooth facing the center of a circle.

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