Paper cutting method and equipment for rotor assembly

Abstract

The present application discloses a paper cutting method and device for a rotor assembly. The paper cutting method includes the following processing steps: First, clamp the rotor assembly; Second, position at least one cutting head from an initial position to the outside of the first edge of the insulating paper and in the circumferential direction at the middle of the outer surface of a core. The cutting head has an edge facing the first edge and a lifting portion radially located inside the first edge; Third, move the cutting head radially outward so that the lifting portion peels the insulating paper from the outer surface of the core; Fourth, move the cutting head axially toward the second end wall so that the insulating paper peeled from the outer surface of the core is cut by the edge of the cutting head, so that the insulating paper on both sides of the cut forms two opposite wing portions; Fifth, fold and press part or all of the wing portions toward the side of the winding groove where their roots are located.

Description

Technical Field

[0001] This application relates to the field of motor processing, and particularly to a method and device for cutting paper of a rotor assembly. Background Art

[0002] In the manufacture of a rotor, in order to ensure insulation between the iron core and the enameled wire, an insulating paper is coated in the winding slot before winding. At the same time, in order to improve the processing efficiency and convenience, generally, a whole insulating paper is used to coat all the winding slot surfaces and the outer surface of the iron core on the entire circumferential surface of the rotor, and the insulating paper coated on the outer surface of the iron core is removed after winding. Please refer to an insulating paper cutting tool disclosed in Chinese Patent Application No. 201110447919.1, which cuts off the insulating paper on the outer surface of the iron core by designing a cutting edge matching a specific rotor slot width. However, this method cuts off all the insulating paper on the outer surface of the iron core and cannot be utilized, resulting in waste. Moreover, this design is mainly for manual operation, and one tool is adapted to one specification of the rotor, with weak versatility. Another method is to press a saw blade on the insulating paper on the outer surface of the iron core and cut the insulating paper by the cutting movement of the saw blade. However, during the cutting process, the cutting edge of the saw blade inevitably contacts the outer surface of the iron core to generate iron chips. If these iron chips cannot be completely cleaned, it will pose a great potential safety hazard to the subsequent motor.

[0003] Therefore, it is necessary to make improvements to overcome the technical problems existing in the prior art. Summary of the Invention

[0004] The main problems to be solved by this application are the waste of cutting off the insulating paper on the outer surface of the iron core and the safety problem caused by the residue of iron chips.

[0005] To solve the above technical problems, the present application provides a method for cutting insulating paper of a rotor assembly. The rotor assembly includes an iron core, insulating paper, and enameled wire. A plurality of wire grooves are circumferentially distributed on the iron core, and wire groove surfaces and the outer surface of the iron core are alternately formed. The insulating paper is coated on the wire groove surfaces and the outer surface of the iron core. The enameled wire is wound between two adjacent wire grooves coated with the insulating paper. The iron core has a first end wall and a second end wall perpendicular to the axial direction. The insulating paper has a first edge axially adjacent to the first end wall and a second edge adjacent to the second end wall. The method for cutting insulating paper includes the following processing steps: First, clamp the rotor assembly; Second, position at least one cutting head from the initial position to the outside of the first edge of the insulating paper and at the middle of the outer surface of an iron core in the circumferential direction. The cutting head has a blade with a blade surface facing the first edge and a lifting part radially located inside the first edge; Third, move the cutting head radially outward so that the lifting part peels the insulating paper from the outer surface of the iron core; Fourth, move the cutting head axially toward the second end wall so that the insulating paper peeled from the outer surface of the iron core is cut by the blade of the cutting head, so that the insulating paper on both sides of the cut forms two opposite wing parts; Fifth, fold and press part or all of the wing parts toward the wire groove where their roots are located.

[0006] The present application also provides a device for cutting insulating paper of a rotor assembly, which includes a clamping part for clamping the rotor assembly, a cutting head assembly, and a wing folding and pressing part. The cutting head included in the cutting head assembly can move along a processing track and has the following operation path on the processing track: a starting position, located outside the first edge of the insulating paper and at the middle of the outer surface of an iron core in the circumferential direction; a lifting section, in which the cutting head peels the insulating paper from the outer surface of the iron core in a direction away from the outer surface of the iron core; a paper cutting section, in which the cutting head moves axially toward the second end wall to cut the insulating paper peeled from the outer surface of the iron core; and a reset section, in which the cutting head returns from the end position of the paper cutting section to the starting position. The wing folding and pressing part is located behind the moving direction of the cutting head and has a guiding surface for guiding the wing formed by cutting the insulating paper to be folded and pressed toward the side of the wire groove where its root is located.

[0007] According to the present application, the insulating paper coated on the outer surface of the iron core is cut but not removed, and is left to be used as an insulating part for folding and coating the enameled wire subsequently, which makes full use of existing materials and reduces waste. Moreover, the design of the lifting part peeling the insulating paper from the outer surface of the iron core avoids generating iron filings when contacting the outer surface of the iron core during the paper cutting process, reducing potential safety hazards. Description of the Drawings

[0008] Referring to the following detailed description of the specific embodiments in conjunction with the drawings, the present application will be more fully understood. Among them:

[0009] Figure 1(a) shows a schematic cross-sectional structure of the iron core in the rotor assembly processed by the paper cutting method and equipment of the present application;

[0010] Figure 1(b) shows a schematic cross-sectional structure of the rotor assembly processed by the paper cutting method and equipment of the present application;

[0011] Figure 2 Shows a schematic diagram of the relative position between the cutter head and the rotor assembly and the processing track structure in the paper cutting method of the present application;

[0012] Figure 3 Shows a schematic three-dimensional structure of the paper cutting equipment of the present application;

[0013] Figure 4 Shows a schematic diagram of the working principle of the torque positioning component in the paper cutting equipment of the present application. Specific embodiments

[0014] The following will describe in detail the paper cutting method and paper cutting equipment of the specific embodiments of the present application in conjunction with Figures 1-4. Based on the characteristics of the rotor assembly itself, the axial direction mentioned in this application document refers to the axis direction of the rotor assembly, the circumferential direction refers to the outer circumferential surface direction of the rotor assembly, and the radial direction refers to the diameter direction passing through the center of the rotor assembly. Unless otherwise specified, the positive and negative directions of the above directions are not limited. This will not be elaborated later, please note.

[0015] Before describing the paper cutting method and paper cutting equipment of the specific embodiments of the present application, it is necessary to introduce the object processed by the present application: the rotor assembly. Please refer to Figures 1(a), 1(b) and Figure 2 As shown, the rotor assembly includes an iron core 10, an insulating paper 20, and an enameled wire 30. The iron core 10 is provided with a plurality of winding grooves 101 at circumferential intervals and forms winding groove surfaces 1011 and an iron core outer surface 102 that are alternately arranged. The insulating paper 20 is coated on the winding groove surfaces 1011 and the iron core outer surface 102. The enameled wire 30 is wound between two adjacent winding grooves 101 coated with the insulating paper 20. The iron core 10 has a first end wall 103 and a second end wall 104 perpendicular to the axial direction, and the insulating paper 20 has a first edge 201 axially adjacent to the first end wall 103 and a second edge 202 adjacent to the second end wall 104. After the above rotor assembly is wound, the insulating paper 20 in the winding groove 101 is tightly attached to the winding groove surface 1011 by the winding, and the insulating paper 20 on the iron core outer surface 102 is basically attached to the iron core outer surface 102 indirectly due to the fixation of the insulating paper 20 in the two adjacent winding grooves 101 on both sides.

[0016] Please pay special attention to referring to Figure 2, a method for cutting the insulating paper of a rotor assembly in this application includes the following processing steps: First, provide a rotor assembly that has been completed with clamping; Second, provide a tool head 502 and position it outside the first edge 201 of the insulating paper 20 and in the middle of the outer surface 102 of a core in the circumferential direction. The tool head 502 has a blade 5021 facing the first edge 201 axially and a lifting portion 5022 located radially inside the first edge 201; Third, move the tool head 502 radially outward so that the lifting portion 5022 peels the insulating paper 20 from the outer surface 102 of the core; Fourth, move the tool head 502 axially toward the second end wall 104 so that the insulating paper 20 covering the outer surface 102 of the core is cut by the blade 5021 of the tool head 502, and the insulating paper 20 on both sides of the cut forms two opposite wing portions; Fifth, fold and press some or all of the wing portions toward the side of the winding groove 101 where their roots are located. The insulating paper 20 covering the outer surface 102 of the core is cut but not removed, and is left to be used as an insulating portion for subsequently folding and covering the enameled wire 30, making full use of existing materials and reducing waste. Moreover, the design of the lifting portion 5022 peeling the insulating paper 20 from the outer surface 102 of the core avoids generating iron filings when contacting the outer surface 102 of the core during the paper cutting process, reducing potential safety hazards. The first edge 201 of the insulating paper 20 extends axially beyond the first end wall 103, and the lifting portion 5022 peels the part of the insulating paper 20 that extends beyond the first end wall 103 from the outer surface 102 of the core outside the first end wall 103. This design configures the work of peeling the insulating paper 20 from the outer surface 102 of the core outside the first end wall 103, further reducing the possibility of the tool head 502 contacting the outer surface 102 of the core during the paper cutting process.

[0017] It can be understood that the above are the steps for cutting the insulating paper 20 on the outer surface 102 of one of the cores of the rotor assembly. The paper cutting process for a complete rotor assembly includes several cycles of these steps, that is, after step five, rotate the rotor assembly around the axis so that the tool head 502 is repositioned outside the first edge 201 of the insulating paper 20 and in the middle of the outer surface of the next core to be processed in the circumferential direction. Specifically in this embodiment, the rotation of the rotor assembly after clamping is controlled by a servo motor (not shown in the figure). Please refer to Figure 4, the paper cutting method further includes providing a needle portion 701 radially extending into the winding groove 101. The needle portion 701 bears the torque generated by the rotational pressing of the winding groove 101 and feeds it back to the servo motor. According to the correspondence between the initially set torque and angle, and the relative angle of the preset position, the middle part of the outer surface 102 of the iron core is adjusted and aligned with the cutter head 502. This step is mainly used for the first calibration after clamping. For subsequent cycles, it is only necessary to rotate a fixed angle as needed. It is worth mentioning that this calibration method can obtain torque data only by lightly pressing the insulating paper 20 in the winding groove 101 laterally. Only point contact or slight sliding contact will occur between the needle portion 50 and the insulating paper 20, and no damage will be caused to the insulating paper 20 and the iron core 10.

[0018] The above is an explanation of the paper cutting process of the rotor assembly from the perspective of the implementation method. Please focus on combining Figure 2 and Figure 3 As shown, the present application also provides a paper cutting device capable of implementing the paper cutting method of the rotor assembly. The paper cutting device includes a clamping portion 40 for clamping the rotor assembly, a cutter head assembly 50, and a wing folding and pressing portion 60. The cutter head assembly 50 includes a cutter head 502. The cutter head 502 can move along the processing track 501 and has the following operation path on the processing track 501: starting position A, located outside the first edge 201 of the insulating paper 20 and circumferentially located in the middle of an outer surface 102 of the iron core; lifting section AB, in the lifting section AB, the cutter head 502 peels the insulating paper 20 away from the outer surface 102 of the iron core; paper cutting section BC, in the paper cutting section BC, the cutter head 502 axially moves towards the second end wall 104 to cut the insulating paper 20 peeled from the outer surface 102 of the iron core; and reset section CA, in the reset section CA, the cutter head 502 returns from the end position of the paper cutting section BC to the starting position A. The wing folding and pressing portion 60 is located behind the moving direction of the cutter head and has a guiding surface for guiding the wing formed by cutting the insulating paper 20 to be folded and pressed towards the side of the winding groove 101 where its root is located. The processing track 501 of the paper cutting section BC is parallel to the axis of the clamping portion 40, and the lifting section AB changes at an angle away from the axis of the clamping portion 40. The wing folding and pressing portion 60 is located behind the moving direction of the cutter head and has a guiding surface (not shown in the figure) for guiding the wing formed by cutting the insulating paper 20 to be folded and pressed towards the side of the winding groove 101 where its root is located. Please also combine Figure 4, the paper cutting device further includes a torque positioning assembly 70. The torque positioning assembly includes a needle portion 701 that radially extends into the winding groove mentioned above. The needle portion 701 bears the torque generated by the rotation of the winding groove 101 and feeds it back to the servo motor, so that the servo motor controls the rotation of the rotor assembly in response to the torque, thereby aligning the cutting head 502 with the middle of the outer surface 102 of the iron core.

[0019] The above specific embodiments are only used to illustrate the present application and are not a limitation to the present application. For example, in the above embodiment, the cutting head assembly 50 is only provided with one cutting head, so that two opposite wing portions are formed on both sides of the cut of the insulating paper. However, the roots of the two wing portions belong to two different winding grooves and cannot complete the folding of the two wing portions of the same winding groove through one folding press. In some other embodiments, two cutting heads can also be provided on the cutting head assembly 50, and the two cutting heads are positioned at the middle of two adjacent outer surfaces of the iron core. In this way, two wing portions of the same winding groove can be formed through one paper cutting, and then the wing folding portion can complete the complete folding of the two wing portions of the same winding groove at one time, improving the folding efficiency and stability. In addition, the cutting head in the above embodiment only cuts from the approximate middle position of the outer surface of the iron core and is not limited to the absolute middle position. In some other embodiments, the cutting head can even be asymmetrically positioned at the middle of an outer surface of an iron core in the circumferential direction, so that two wing portions with different widths are formed after the insulating paper is cut. Furthermore, in combination with the design of the wing folding portion, the folding process of the two wing portions in the same winding groove can be optimized. In summary, those of ordinary skill in the relevant technical field can make various changes and modifications without departing from the scope of the present application. Therefore, all equivalent technical solutions also belong to the scope of the present application, and the patent protection scope of the present application should be defined by the claims.

Claims

1. A paper cutting method for a rotor assembly, the rotor assembly including an iron core (10), insulating paper (20) and enameled wire (30), the iron core (10) having a plurality of winding grooves (101) circumferentially spaced apart and forming alternately arranged winding groove surfaces (1011) and an outer surface (102) of the iron core, the insulating paper (20) covering the winding groove surfaces (1011) and the outer surface (102) of the iron core, the enameled wire (30) being wound between two adjacent winding grooves (101) covered by the insulating paper (20), the iron core (10) having a first end wall (103) and a second end wall (104) perpendicular to the axial direction, the insulating paper (20) having a first edge (201) axially adjacent to the first end wall (103) and a second edge (202) adjacent to the second end wall (104), characterized in that: The paper cutting method includes the following steps:

1. Clamp the rotor assembly; 2. Position at least one cutter head (502) from an initial position to the outside of the first edge (201) of the insulating paper (20) and circumferentially at the middle of an outer surface (102) of an iron core. The cutter head (502) has a blade (5021) with a blade surface facing the first edge (201) and a lifting part (5022) radially located inside the first edge (201); 3. Move the cutter head (502) radially outwards so that the lifting part (5022) peels the insulating paper (20) from the outer surface (102) of the iron core; 4. Axially move the cutter head (502) towards the second end wall (104) so that the insulating paper (20) peeled from the outer surface (102) of the iron core is cut by the blade (5021) of the cutter head (502), so that the insulating paper (20) on both sides of the cut forms two opposite wing parts; 5. Guide part or all of the wing parts to be folded and pressed towards one side of the winding groove (101) where their roots are located; 2. The paper cutting method according to claim 1, characterized in that: The first edge (201) of the insulating paper (20) axially extends beyond the first end wall (103), and the lifting part (5022) peels the part of the insulating paper (20) beyond the first end wall (103) from the outer surface (102) of the iron core outside the first end wall (103); 3. The paper cutting method according to claim 1, characterized in that: In step 2, two cutter heads (502) are provided, and the two cutter heads (502) are positioned at the middle of two adjacent outer surfaces (102) of the iron cores; 4. The paper cutting method according to claim 1, characterized in that: In step 2, the cutter head (502) is circumferentially asymmetrically positioned at the middle of an outer surface of an iron core so that two wing parts with different widths are formed after the insulating paper is cut; 5. The paper cutting method according to claim 1, characterized in that: The paper cutting method further includes rotating the rotor assembly to the next iron core outer surface to be processed after step 5 and resetting the cutter head (502) to the initial position, and repeating steps 2 to 5; 6. The paper cutting method according to claim 5, characterized in that: The rotation of the rotor assembly around the axis is controlled by a servo motor, and the paper cutting method further includes providing a needle part (701) radially extending into the winding groove (101). The needle part (701) bears the torque generated by the rotation of the winding groove (101) and feeds it back to the servo motor, so that the servo motor controls the rotation of the rotor assembly around the axis in response to the torque, so that the cutter head (502) is aligned with the middle of the outer surface (102) of the iron core.

7. A paper cutting device for a rotor assembly, the rotor assembly including an iron core (10), insulating paper (20), and enameled wire (30), the iron core (10) having a plurality of winding grooves (101) circumferentially spaced apart and having alternately arranged winding groove surfaces (1011) and an outer iron core surface (102), the insulating paper (20) covering the winding groove surfaces (1011) and the outer iron core surface (102), the enameled wire (30) being wound between two adjacent winding grooves (101) covered by the insulating paper (20), the iron core (10) having a first end wall (103) and a second end wall (104) perpendicular to the axial direction, the insulating paper (20) having a first edge (201) axially adjacent to the first end wall (103) and a second edge (202) adjacent to the second end wall (104), characterized in that: The paper cutting device includes a clamping portion (40) for clamping the rotor assembly, a cutter head assembly (50), and a wing folding and pressing portion (60), the cutter head assembly (50) including a cutter head (502), the cutter head (502) being capable of moving along a processing track (501) and having the following operation path on the processing track (501): a starting position (A), located outside the first edge (201) of the insulating paper (20) and circumferentially in the middle of an outer iron core surface (102); a lifting section (AB), in which the cutter head (502) peels the insulating paper (20) away from the outer iron core surface (102) in a direction away from the outer iron core surface (102); a paper cutting section (BC), in which the cutter head (502) axially moves towards the second end wall (104) to cut the insulating paper (20) peeled away from the outer iron core surface (102); and a reset section (CA), in which the cutter head (502) returns from the end position of the paper cutting section (BC) to the starting position (A), the wing folding and pressing portion (60) being located behind the moving direction of the cutter head and having a guiding surface for guiding the wing formed by cutting the insulating paper (20) to be folded and pressed towards the side of the winding groove (101) where its root is located.

8. The paper cutting device according to claim 7, wherein: The paper cutting device further includes a torque positioning assembly, the torque positioning assembly including a needle portion (701) radially extending into the winding groove, the needle portion (701) receiving the torque generated by the rotation of the winding groove (101) and feeding it back to the servo motor, so that the servo motor controls the rotation of the rotor assembly in response to the torque, thereby aligning the cutter head (502) with the middle of the outer iron core surface (102).

9. The paper cutting device according to claim 7, characterized in that: The cutter head assembly (50) has two cutter heads (502) positioned at the middle of two adjacent surface portions of the outer iron core surface (102) separated by the same circumferential interval.

10. The paper cutting device according to claim 7, characterized in that: The paper cutting section (BC) of the processing track (501) is parallel to the axis of the clamping portion (40), and the lifting section (AB) varies at an angle in a direction away from the axis of the clamping portion (40).

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