Squirrel cage type motor rotor structure and motor

Abstract

The utility model discloses a rotor structure of a squirrel-cage type motor, which comprises a rotating shaft, a rotor iron core sleeved on the rotating shaft, a plurality of aluminum conducting bars assembled on the rotor iron core and aluminum end rings positioned at two ends of the rotor iron core, the aluminum conducting bars are inserted into the assembling grooves and extend out of the two ends of the rotor iron core in a protruding mode, the aluminum end rings comprise axial grooves used for installing the end portions of the aluminum conducting bars, and the multiple aluminum conducting bars are fixedly connected with the aluminum end rings in a welded mode. The aluminum conducting bar is adopted and is fixedly connected with the aluminum end ring in a welding manner, so that a cast aluminum structure is avoided, and the risks of large unbalance, abnormal sound, burning and the like of the motor caused by defects, broken bars and thin bars of the end ring can be avoided. The utility model also discloses a motor with the squirrel-cage type motor rotor structure.

Description

Technical Field

[0001] The utility model relates to the technical field of squirrel-cage motors, in particular to a rotor structure of a squirrel-cage motor and a motor. Background Art

[0002] The squirrel-cage motor gets its name because its rotor shape resembles a squirrel cage. It has the advantages of large power, small volume, light weight, and good quality, so it has been widely used. The rotor structure of a squirrel-cage motor generally consists of a rotating shaft, a rotor core, bars, and end rings. Among them, the rotor core is the main part of the rotor structure. Usually, a number of assembly grooves are evenly arranged along the circumference of the rotor core, and the bars are die-cast in the assembly grooves. This cast-aluminum structure is prone to end-ring defects, broken bars, thin bars, resulting in risks such as large unbalance amount, abnormal noise, and burnout of the motor.

[0003] Therefore, it is necessary to develop a new rotor structure of a squirrel-cage motor to solve at least one of the above technical problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a rotor structure of a squirrel-cage motor and a motor.

[0005] To achieve the above utility model purpose, the utility model adopts the following technical scheme: A rotor structure of a squirrel-cage motor, which includes a rotating shaft, a rotor core sleeved on the rotating shaft, a number of aluminum bars assembled on the rotor core, and aluminum end rings located at both ends of the rotor core. The rotor core is provided with a number of axially extending assembly grooves along the circumference. The aluminum bars are inserted into the assembly grooves and protrude from both ends of the rotor core. The aluminum end rings include axial grooves for installing the ends of the aluminum bars, and a number of the aluminum bars and the aluminum end rings are fixedly connected by welding.

[0006] As a further improved technical scheme of the utility model, the assembly groove includes a waist-shaped main groove and a slit groove extending from one end of the waist-shaped main groove to the outer surface of the rotor core. The aluminum bar is in the shape of a long strip with a waist-shaped cross-section and is adapted to the waist-shaped main groove.

[0007] As a further improved technical scheme of the utility model, the axial groove is a stepped groove for limiting and installing the aluminum bar.

[0008] As a further improved technical scheme of the utility model, the axial groove includes an arc-shaped groove bottom adapted to the aluminum bar and a groove opening provided on the outer surface of the aluminum end ring. One end of the arc-shaped groove bottom is open and the other end is provided with a limiting wall.

[0009] As a further improved technical scheme of the utility model, the aluminum bar and the aluminum end ring are radially welded and fixed at the groove opening to form a radial welding part.

[0010] As a further improved technical solution of the present utility model, an annular groove is recessed on the end face of the aluminum end ring, and the annular groove is communicated with each of the axial grooves.

[0011] As a further improved technical solution of the present utility model, the aluminum bar and the aluminum end ring are circumferentially welded and fixed in the annular groove to form a circumferential welding part.

[0012] As a further improved technical solution of the present utility model, the free end of the aluminum bar includes an end face, a first arc portion and a second arc portion located on both sides of the end face. The first arc portion is matched with the bottom of the arc groove, the second arc portion is provided with a step portion, the step portion is located at the notch and is welded and fixed with the aluminum end ring, and the end face is limited by the limiting wall and is welded and fixed with the aluminum end ring in the annular groove.

[0013] As a further improved technical solution of the present utility model, the two aluminum end rings are symmetrically arranged.

[0014] The present utility model also discloses a motor, which includes the squirrel-cage motor rotor structure as described above.

[0015] The beneficial effects of the present utility model are as follows: Aluminum bars are adopted and the aluminum bars are welded and fixed to the aluminum end ring, thereby avoiding the cast aluminum structure and the risks of end ring defects, broken bars, thin bars, large motor unbalance, abnormal noise, burnout, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the squirrel-cage motor rotor structure of the present utility model;

[0017] Figure 2 is Figure 1 an enlarged schematic diagram of part A in the circle;

[0018] Figure 3 is a schematic structural diagram of the rotor core of the squirrel-cage motor rotor structure of the present utility model;

[0019] Figure 4 is Figure 3 an enlarged schematic diagram of part B in the circle;

[0020] Figure 5 is a schematic structural diagram of the aluminum bar of the squirrel-cage motor rotor structure of the present utility model;

[0021] Figure 6 is Figure 5 an enlarged schematic diagram of part C in the circle;

[0022] Figure 7 is a schematic structural diagram of the aluminum end ring of the squirrel-cage motor rotor structure of the present utility model;

[0023] Figure 8 is Figure 7 a schematic cross-sectional view;

[0024] Figure 9 is Figure 7 a schematic structural view from another angle;

[0025] Figure 10 is Figure 9 an enlarged schematic view of part D of the middle circle. Specific embodiments

[0026] The following will describe the present utility model in detail in conjunction with the embodiments shown in the accompanying drawings. Please refer to the illustrations, which are the preferred embodiments of the present utility model. However, it should be noted that these embodiments are not limitations on the present utility model, and any equivalent transformation or substitution in function, method, or structure made by those of ordinary skill in the art based on these embodiments shall fall within the protection scope of the present utility model.

[0027] Please refer Figures 1 to 10 , the present utility model discloses a squirrel-cage motor rotor structure 100. The squirrel-cage motor rotor structure 100 includes a rotating shaft 1, a rotor core 2 sleeved on the rotating shaft 1, a plurality of aluminum bars 3 assembled on the rotor core 2, and aluminum end rings 4 located at both ends of the rotor core 2. The rotor core 2 is provided with a plurality of axially extending assembly grooves 21 along the circumference. The aluminum bars 3 are inserted into the assembly grooves 21 and protrude from both ends of the rotor core 2. The aluminum end rings 4 include axial grooves 41 for installing the ends of the aluminum bars 3, and a plurality of aluminum bars 3 and the aluminum end rings 4 are fixedly connected by welding. The use of aluminum bars 3 and the fixed connection of the aluminum bars 3 and the aluminum end rings 4 by welding thus avoids the cast-aluminum structure and can prevent risks such as end-ring defects, broken bars, thin bars, large unbalance of the motor, abnormal noise, and burnout.

[0028] Please refer to Figures 3 to 6 , the assembly grooves 21 of the rotor core 2 include waist-shaped main grooves 211 and slit grooves 212 extending from one end of the waist-shaped main grooves 211 to the outer surface of the rotor core 2. The aluminum bars 3 are in the shape of long bars with a waist-shaped cross-section and are adapted to the waist-shaped main grooves 211. The aluminum bars 3 are assembled by being adapted to the assembly grooves 21, replacing the cast-aluminum structure. The aluminum bars 3 are assembled as a whole, avoiding risks such as broken bars and thin bars, and ensuring the balance and stability of the entire motor.

[0029] Please refer Figures 5 to 10 , the axial grooves 41 are stepped grooves for limiting and installing the aluminum bars 3. Specifically, the stepped grooves include an arc-shaped groove bottom 411 adapted to the aluminum bars 3 and a groove opening 412 provided on the outer surface of the aluminum end rings 4. One end of the arc-shaped groove bottom 411 is open and the other end is provided with a limiting wall 413. The aluminum bars 3 and the aluminum end rings 4 are radially welded and fixedly connected at the groove opening 412 to form a radial welding portion 51.

[0030] The end face of the aluminum end ring 4 is concavely provided with an annular groove 42, and the annular groove 42 is communicated with each axial groove 41. The aluminum bar 3 and the aluminum end ring 4 are fixedly welded in the circumferential direction in the annular groove 42 to form a circumferential welding part 52.

[0031] Specifically, the free end of the aluminum bar 3 includes an end face 31 and a first arc portion 32 and a second arc portion 33 located on both sides of the end face 31. The first arc portion 32 is matched with the arc-shaped groove bottom 411, and the second arc portion 33 is provided with a step portion 331. The step portion 331 is located at the groove opening 412 and is fixedly welded with the aluminum end ring 4. The end face 31 is limited by the limiting wall 413 and is fixedly welded with the aluminum end ring 4 in the annular groove 42. The step portion 331 facilitates the accommodation of solder and ensures the welding with the aluminum end ring 4. Therefore, the aluminum bar 3 and the aluminum end ring 4 are fixedly welded in the radial and circumferential directions, so that the aluminum bar 3 and the aluminum end ring 4 form an integral structure, thereby having a stable structure, increasing the balance performance of the entire motor, and eliminating risks such as abnormal noise and burnout. The two aluminum end rings 4 are symmetrically arranged, and both ends of the aluminum bar 3 are fixedly welded through the aluminum end rings 4 and are symmetrically arranged, increasing the structural stability.

[0032] The present utility model also discloses a motor, which includes the squirrel-cage motor rotor structure 100 as described above. By adopting the rotor structure 100 with the aluminum bar 3 and the aluminum end ring 4, a squirrel-cage motor is formed. The motor avoids the cast-aluminum structure, is not prone to end-ring defects, and eliminates risks such as broken bars, thin bars, large unbalance of the motor, abnormal noise, and burnout, thus obtaining a stable and steady motor.

[0033] It should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0034] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present utility model, and they are not used to limit the protection scope of the present utility model. Any equivalent embodiments or changes made without departing from the technical spirit of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A squirrel-cage motor rotor structure, characterized in that, It includes a rotating shaft, a rotor core sleeved on the rotating shaft, a plurality of aluminum bars assembled on the rotor core, and aluminum end rings located at both ends of the rotor core. The rotor core is provided with a plurality of assembly grooves extending axially along the circumference. The aluminum bars are inserted into the assembly grooves and protrude from both ends of the rotor core. The aluminum end rings include axial grooves for installing the ends of the aluminum bars, and the plurality of aluminum bars and the aluminum end rings are fixedly connected by welding.

2. The squirrel-cage motor rotor structure according to claim 1, characterized in that, The assembly groove includes a kidney-shaped main groove and a slit groove extending from one end of the kidney-shaped main groove to the outer surface of the rotor core. The aluminum bar is in the shape of a long strip with a kidney-shaped cross-section and is adapted to the kidney-shaped main groove.

3. The squirrel-cage motor rotor structure according to claim 1, characterized in that, The axial groove is a stepped groove for limiting and installing the aluminum bar.

4. The squirrel-cage motor rotor structure according to claim 3, characterized in that The axial groove includes an arc-shaped groove bottom adapted to the aluminum bar and a groove opening provided on the outer surface of the aluminum end ring. A limiting wall is provided at one end of the arc-shaped groove bottom.

5. The squirrel-cage motor rotor structure according to claim 4, characterized in that, The aluminum bar and the aluminum end ring are fixedly welded at the groove opening to form a radial welding portion.

6. The squirrel-cage motor rotor structure according to claim 5, characterized in that, A circular groove is recessed on the end face of the aluminum end ring, and the circular groove is communicated with each of the axial grooves.

7. The squirrel-cage motor rotor structure according to claim 6, characterized in that, The aluminum bar and the aluminum end ring are fixedly welded circumferentially in the circular groove to form a circumferential welding portion.

8. The squirrel-cage motor rotor structure according to claim 7, characterized in that The free end of the aluminum bar includes an end face, a first arc-shaped portion and a second arc-shaped portion located on both sides of the end face. The first arc-shaped portion cooperates with the arc-shaped groove bottom. The second arc-shaped portion is provided with a stepped portion. The stepped portion is located at the groove opening and is fixedly welded to the aluminum end ring. The end face is limited by the limiting wall and is fixedly welded to the aluminum end ring in the circular groove.

9. The squirrel-cage motor rotor structure according to claim 1, wherein The two aluminum end rings are symmetrically arranged.

10. A motor, characterized in that, It includes a squirrel-cage motor rotor structure according to any one of claims 1 to 9.

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