Rotor winding and asynchronous machine

Abstract

The utility model discloses a rotor winding and asynchronous motor relates to motor technical field, and rotor winding includes end ring and guide bar, and the end face of end ring is equipped with several embedding grooves, and all embedding grooves are radially distributed with the center line of end ring as center, the end portion convex of guide bar is equipped with several convex teeth, and all convex teeth are radially distributed with the center line of guide bar as center, and all convex teeth and all embedding grooves one -to -one corresponding concave convex cooperation along the axial direction of guide bar, and the convex tooth of cooperation and embedding groove are fixedly connected. The utility model changes the point contact of the end face of end ring and guide bar two from the original surface contact, eliminates the local deformation of surface contact due to uneven expansion, and the flexible adjustment characteristics of point contact can make stress distribution more uniform, reduce the cracking risk caused by stress concentration, effectively improve the connecting strength between end ring and guide bar, and further improve the reliability of rotor winding.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a rotor winding and an asynchronous motor. Background Technology

[0002] Asynchronous motors are widely used in industrial fields, such as fans, compressors, and cranes, due to their advantages of simple structure, reliable operation, and convenient maintenance. Especially in industries that require variable frequency speed control or high-speed operation, more stringent requirements are placed on the operating performance of asynchronous motors, making it particularly necessary to optimize their structure.

[0003] For heavy-load starting or applications requiring soft mechanical characteristics, wound-rotor motors are typically selected; however, under normal circumstances, squirrel-cage induction motors, with their simple structure, low cost, and easy maintenance, are preferred. The rotor windings of squirrel-cage induction motors are divided into two main categories: cast aluminum rotors and copper bar rotors. (See attached...) Figure 1 As shown, the copper bar rotor is formed by welding copper guide bars 01 and copper end rings 02. Specifically, one end of the copper end ring 02 is provided with an annular groove. After pressing the copper guide bar 01 into the annular groove, the copper guide bar 01 and the copper end ring 02 are welded and fixed together using silver-copper solder.

[0004] However, stress concentration is most likely to occur at the weld between the copper conductor bar 01 and the copper end ring 02. When the rotor winding rotates at high speed, the weld is prone to breakage, affecting the reliability of the rotor winding. Utility Model Content

[0005] The purpose of this utility model is to provide a rotor winding and an asynchronous motor in which the embedded groove of the end ring and the raised teeth of the guide bar are circumferentially concave and convex, changing the end face of the end ring and the guide bar from the original surface contact to point contact, thereby improving the connection strength between the end ring and the guide bar, improving the reliability of the rotor winding, and solving the technical problem of low reliability caused by unstable connection of existing rotor windings.

[0006] To achieve the above objectives, this utility model provides a rotor winding, comprising:

[0007] The end ring has several embedded grooves on its end face, and all the embedded grooves are distributed radially with the center line of the end ring as the center.

[0008] The guide bar has several protruding teeth at its end, and all the protruding teeth are radially distributed with the center line of the guide bar as the center. All the protruding teeth and all the embedded grooves are in one-to-one correspondence and fit together along the axial direction of the guide bar, and the fitting protruding teeth are fixedly connected to the embedded grooves.

[0009] In some embodiments, it also includes:

[0010] A pressure ring is located inside the guide bar; one end of the pressure ring is provided with several limiting grooves, and the other end is provided with a support ring; all the limiting grooves and all the protruding teeth are in one-to-one correspondence and fit along the circumference of the guide bar; the support ring is provided with several fasteners distributed along the circumference, and each fastener abuts against the inner sidewall of the end ring along the radial direction of the end ring.

[0011] In some embodiments, the mating protrusions are welded to the embedded groove.

[0012] In some embodiments, each protruding tooth has a serrated edge on one side of the insertion groove.

[0013] In some embodiments, each protruding tooth has a plurality of triangular serrations on one end face facing the insertion groove, and all the triangular serrations are distributed at equal intervals along the radial direction of the guide bar.

[0014] In some embodiments, the width of the embedded groove gradually increases along the radial direction of the end ring in the direction away from the centerline of the end ring; and the width of the protruding tooth gradually increases along the radial direction of the guide bar in the direction away from the centerline of the guide bar.

[0015] In some embodiments, the embedded groove is a trapezoidal groove, and the protruding teeth are trapezoidal teeth.

[0016] In some embodiments, all the limiting grooves are radially distributed around the center line of the pressure ring, and all the limiting grooves are one-to-one opposite to all the embedding grooves along the axial direction of the guide bar; the sum of the axial depth of the embedding groove and the axial depth of the limiting groove is less than the axial height of the protruding tooth.

[0017] In some embodiments, a limiting boss is provided at one end of the embedding groove away from the center line of the end ring, and the two ends of the protruding teeth abut against the inner sidewall of the embedding groove and the limiting boss respectively; a clearance notch is provided on one side of the protruding teeth, and the clearance notch is used to avoid the limiting boss along the axial direction of the guide bar.

[0018] This utility model also provides an asynchronous motor, including the above-mentioned rotor winding.

[0019] Compared to the prior art, this invention optimizes the structure of the rotor winding. The end face of the end ring is provided with several embedded grooves, all radially distributed around the center line of the end ring. The end protrusion of the conductor bar is provided with several raised teeth, all radially distributed around the center line of the conductor bar. All raised teeth and all embedded grooves correspond one-to-one along the axial direction of the conductor bar, and the mating raised teeth are fixedly connected to the embedded grooves. In other words, this invention changes the end face of the end ring and conductor bar from surface contact to point contact, eliminating local deformation caused by uneven expansion in surface contact. Furthermore, the flexible adjustment characteristics of point contact allow for more uniform stress distribution, reducing the risk of cracking caused by stress concentration, effectively improving the connection strength between the end ring and the conductor bar, and thus improving the reliability of the rotor winding. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a cross-sectional view of the copper conductor bars and copper end rings of the original rotor winding;

[0022] Figure 2 This is a cross-sectional view of the rotor winding provided in an embodiment of the present utility model;

[0023] Figure 3 for Figure 2 A magnified view of part A in the image;

[0024] Figure 4 for Figure 2 Axonometric view of the middle ring;

[0025] Figure 5 for Figure 4 The main view;

[0026] Figure 6 for Figure 5 Stepped sectional view along the BB direction;

[0027] Figure 7 for Figure 2 Assembly diagram of the guide bar and pressure ring;

[0028] Figure 8 for Figure 7 The main view;

[0029] Figure 9 for Figure 8 C-axis sectional view;

[0030] Figure 10 for Figure 2 Axonometric view of the intermediate pressure ring;

[0031] Figure 11 for Figure 10 The main view;

[0032] Figure 12 for Figure 11 Sectional view along the DD direction.

[0033] The attached figures are labeled as follows:

[0034] Copper conductor 01 and copper end ring 02;

[0035] End ring 1, guide bar 2, pressure ring 3, and fastener 4;

[0036] Embedded groove 11 and limiting boss 12;

[0037] 21 protruding teeth;

[0038] Triangular serration 211 and clearance notch 212;

[0039] Limiting groove 31 and support ring 32. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] This utility model discloses a rotor winding, as shown in the attached figure. Figure 2 and 3 As shown, it includes an end ring 1 and a guide bar 2. The end ring 1 is arc-shaped and the guide bar 2 is circumferential. Both are made of copper.

[0043] As attached Figures 4 to 6 As shown, the end face of the end ring 1 is provided with several embedding grooves 11, and all the embedding grooves 11 are radially distributed with the center line of the end ring 1 as the center. The circumferential distance between any two adjacent end rings 1 is equal, and the axial depth of all end rings 1 is equal.

[0044] As attached Figures 7 to 9 As shown, the end of the guide bar 2 has a plurality of protruding teeth 21. All the protruding teeth 21 are radially distributed with the center line of the guide bar 2 as the center. The circumferential distance between any two adjacent protruding teeth 21 is equal, and the circumferential height of all the protruding teeth 21 is equal. All the protruding teeth 21 and all the embedded grooves 11 are in one-to-one corresponding concave-convex fit along the axial direction of the guide bar 2, and the fitting protruding teeth 21 are fixedly connected to the embedded grooves 11.

[0045] This invention changes the end face of the end ring 1 and the guide bar 2 from the original surface contact to point contact, eliminating the local deformation caused by uneven expansion due to surface contact. Moreover, the flexible adjustment characteristics of point contact can make the stress distribution more uniform, reduce the risk of cracking caused by stress concentration, effectively improve the connection strength between the end ring 1 and the guide bar 2, and thus improve the reliability of the rotor winding.

[0046] As a preferred embodiment, as shown in the appendix Figures 10 to 12 As shown, the rotor winding also includes a pressure ring 3, which is annular in shape. (See attached diagram.) Figure 2 and 9 As shown, a pressure ring 3 is disposed within the guide bar 2. One end of the pressure ring 3 is provided with several limiting grooves 31, and the other end is provided with a support ring 32. The support ring 32 extends axially along the pressure ring 3 and mates with the central hole of the end ring 1. All the limiting grooves 31 and all the protruding teeth 21 are in one-to-one correspondence and engagement along the circumference of the guide bar 2, restricting the circumferential rotation of the pressure ring 3 relative to the guide bar 2. The pressure ring 3 is fixedly connected to the end ring 1, thereby restricting the circumferential rotation of the end ring 1 relative to the guide bar 2. Several fasteners 4 are inserted through the support ring 32. All the fasteners 4 are evenly distributed along the circumference of the support ring 32. Each fastener 4 abuts against the inner sidewall of the end ring 1 along the radial direction of the end ring 1, so that the pressure ring 3 and the end ring 1 are fixedly connected. The pressure ring 3 adds constraint between the end ring 1 and the guide bar 2, improving the connection stability between the end ring 1 and the guide bar 2. The fasteners 4 can specifically be screws. Correspondingly, the sidewall of the support ring 32 is provided with a threaded hole that penetrates radially. However, the types of fastener 4 are not limited to this.

[0047] In a preferred embodiment, the protruding teeth 21 are welded to the embedded groove 11, and the gap between the protruding teeth 21 and the embedded groove 11 is filled with solder to enhance the connection strength between the protruding teeth 21 and the embedded groove 11, thereby improving the connection stability between the end ring 1 and the guide bar 2, reducing the risk of breakage between the end ring 1 and the guide bar 2, and significantly improving the reliability of the rotor winding.

[0048] As a preferred embodiment, the appendix Figures 7 to 9 As shown, each protruding tooth 21 has a serrated end face facing the embedded groove 11, which increases the welding area between the protruding tooth 21 and the embedded groove 11, effectively improving the connection strength between the end ring 1 and the guide bar 2, reducing the risk of weld breakage, and ensuring that the winding works more reliably.

[0049] Specifically, as shown in the attached document Figure 7 As shown, each protruding tooth 21 has several triangular serrations 211 on one side of the end face facing the embedding groove 11. All triangular serrations 211 are distributed at equal intervals along the radial direction of the guide bar 2 to ensure that the protruding tooth 21 and the embedding groove 11 are in uniform contact with the solder, and to avoid uneven stress leading to weld cracking.

[0050] As a preferred embodiment, as shown in the appendix Figure 4 and 5 As shown, along the radial direction of end ring 1, the width of the embedding groove 11 gradually increases in the direction away from the centerline of end ring 1. (See attached diagram) Figure 7 and 8As shown, along the radial direction of the guide bar 2, the width of the protruding tooth 21 gradually increases in the direction away from the center line of the guide bar 2; thereby increasing the contact area between the embedded groove 11 and the protruding tooth 21, which has a significant effect on improving the stability of the rotor winding.

[0051] Specifically, as shown in the attached document Figure 5 and 8 As shown, the embedding groove 11 is a trapezoidal groove, and the raised tooth 21 is a trapezoidal tooth. The contact area between the embedding groove 11 and the raised tooth 21 is maximized while facilitating machining. Of course, the shapes of the embedding groove 11 and the raised tooth 21 are not limited to these; for example, they can also be fan-shaped.

[0052] As a preferred embodiment, as shown in the appendix Figure 10 and 11 As shown, all the limiting grooves 31 are radially distributed around the center line of the pressure ring 3, and all the limiting grooves 31 are one-to-one with all the embedded grooves 11 along the axial direction of the guide bar 2. The sum of the axial depth of the embedded groove 11 and the axial depth of the limiting groove 31 is less than the axial height of the protruding tooth 21. This avoids rigid contact between the end face of the end ring 1 and the end face of the pressure ring 3 due to the small axial height of the protruding tooth 21. During the rotation of the rotor winding, this avoids contact friction between the end ring 1 and the pressure ring 3, which helps to extend their service life, reduce the failure rate, and improve the reliability of the rotor winding.

[0053] As a preferred embodiment, as shown in the appendix Figure 2 As shown, a limiting boss 12 protrudes from one end of the embedding groove 11 away from the center line of the end ring 1. The two ends of the protruding tooth 21 abut against the inner sidewall of the embedding groove 11 and the limiting boss 12, respectively, and restrict the radial movement of the guide bar 2 relative to the end ring 1, ensuring that the protruding tooth 21 is completely embedded in the embedding groove 11 and that the contact between the protruding tooth 21 and the embedding groove 11 is stable. A clearance notch 212 is provided on one side of the protruding tooth 21. The clearance notch 212 is used to avoid the limiting boss 12 along the axial direction of the guide bar 2, which can improve the root strength of the protruding tooth 21 and avoid assembly interference during assembly.

[0054] This utility model also provides an asynchronous motor, including the above-mentioned rotor winding, which has the same beneficial effects.

[0055] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0056] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A rotor winding, characterized by, include: An end ring (1) is provided with a plurality of embedded grooves (11) on its end face, and all the embedded grooves (11) are radially distributed with the center line of the end ring (1) as the center. The guide bar (2) has a plurality of protruding teeth (21) at its end. All the protruding teeth (21) are radially distributed with the center line of the guide bar (2) as the center. All the protruding teeth (21) and all the embedding grooves (11) are in one-to-one corresponding concave-convex fit along the axial direction of the guide bar (2). The fitting protruding teeth (21) are fixedly connected to the embedding grooves (11).

2. The rotor winding of claim 1, wherein Also includes: A pressure ring (3) is provided inside the guide strip (2); one end of the pressure ring (3) is provided with a plurality of limiting grooves (31), and the other end is provided with a support ring (32); all the limiting grooves (31) and all the protruding teeth (21) are in one-to-one corresponding concave-convex fit along the circumference of the guide strip (2); the support ring (32) is provided with a plurality of fasteners (4) distributed along the circumference, and each fastener (4) abuts against the inner sidewall of the end ring (1) along the radial direction of the end ring (1).

3. The rotor winding of claim 1, wherein The protruding tooth (21) is welded to the embedded groove (11).

4. A rotor winding according to any one of claims 1 to 3, characterized in that Each of the protruding teeth (21) has a serrated end face facing the insertion groove (11).

5. The rotor winding of claim 4, wherein, Each of the protruding teeth (21) has a plurality of triangular serrations (211) on one side of the end face facing the embedded groove (11), and all the triangular serrations (211) are distributed at equal intervals along the radial direction of the guide bar (2).

6. A rotor winding according to any one of claims 1 to 3, characterized in that Along the radial direction of the end ring (1), the width of the embedded groove (11) gradually increases in the direction away from the center line of the end ring (1); along the radial direction of the guide bar (2), the width of the protruding tooth (21) gradually increases in the direction away from the center line of the guide bar (2).

7. The rotor winding of claim 6, wherein, The embedded groove (11) is a trapezoidal groove, and the protruding tooth (21) is a trapezoidal tooth.

8. The rotor winding of claim 2, wherein, All the limiting grooves (31) are radially distributed around the center line of the pressure ring (3), and all the limiting grooves (31) are opposite to all the embedding grooves (11) along the axial direction of the guide bar (2); the sum of the axial depth of the embedding groove (11) and the axial depth of the limiting groove (31) is less than the axial height of the protruding tooth (21).

9. A rotor winding according to any one of claims 1 to 3, characterized in that The embedding groove (11) has a limiting boss (12) protruding at one end away from the center line of the end ring (1). The two ends of the protruding tooth (21) abut against the inner side wall of the embedding groove (11) and the limiting boss (12) respectively. A clearance notch (212) is provided on one side of the protruding tooth (21), and the clearance notch (212) is used to avoid the limiting boss (12) along the axial direction of the guide bar (2).

10. An asynchronous electric machine, characterized in that, Includes the rotor winding as described in any one of claims 1 to 9.

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