Device for preventing copper conducting bar located at end part of motor rotor from being broken

Abstract

The utility model discloses a device for preventing copper conducting bars at the end part of a motor rotor from being broken, comprising a rotor assembly which comprises a rotor iron core and a rotating shaft at the middle part of the rotor iron core, a plurality of copper conducting bars are arranged at intervals in the circumferential direction of the rotor iron core, and the copper conducting bars are provided with extension sections along the axial direction of the rotor iron core; the fixed bracket is fixed on the rotating shaft; the copper conducting bar fixing piece comprises at least three arc-shaped pieces which are connected with the fixing support through connecting assemblies, so that all the arc-shaped pieces jointly form a circular ring structure, and a heat dissipation area is formed between the circular ring structure and the fixing support; the arc-shaped piece is provided with a plurality of containing spaces used for containing the extending sections. According to the device for preventing the copper conducting bar at the end part of the motor rotor from being broken, effective protection of the copper conducting bar can be realized, the copper conducting bar is prevented from being broken, and meanwhile, the heat dissipation effect of the end part of the rotor can be improved while the connection effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a device for preventing a copper conducting bar at an end of a motor rotor from breaking. Background Art

[0002] In various existing industrial and mining enterprises in China, electric traction equipment mostly uses high-voltage asynchronous motors as the main driving equipment. High-voltage asynchronous motors are widely used in various industrial and mining enterprises because of their high reliability and good speed regulation range. At present, most high-voltage asynchronous motors are filled with copper bars in the rotor core slots, and copper rings with the same radial size as the rotor core are set at both ends of the rotor. At the same time, the copper rings are set with the same number of slots as the rotor core slots. By inserting the two ends of the copper bars into the slots of the copper rings, and tightening the copper bars and end rings through professional welding technology, the copper bars and two end rings in the rotor form a closed loop. According to the physical properties of metals, the copper bar high-voltage asynchronous motor rotor winding can effectively improve the efficiency of the motor, but due to the high density of copper material itself, the motor rotor will cause the copper bars at both ends of the motor rotor core to deform during high-speed operation, and the high torque start and stop will cause the copper bars to deform; at the same time, the excessive temperature during start and stop will also easily cause the copper bars to deform.

[0003] In view of this, it is necessary to design a device for preventing the copper bars at the ends of the motor rotor from breaking, so as to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a device for preventing the copper bars at the end of a motor rotor from breaking, which can reduce the force between adjacent copper bars, achieve effective protection of the copper bars, avoid the breakage of the copper bars, and ensure the heat dissipation effect of the rotor end.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A device for preventing a copper bar at an end of a motor rotor from breaking, comprising:

[0007] The rotor assembly comprises a rotor core and a rotating shaft located in the middle of the rotor core, wherein a plurality of copper bars are arranged at intervals in the circumferential direction of the rotor core, and the copper bars have a protruding section along the axial direction of the rotor core;

[0008] A fixed bracket, fixed on the rotating shaft;

[0009] The copper conductor fixing part comprises at least three arc-shaped parts connected to the fixing bracket through a connecting assembly, so that all the arc-shaped parts together form a circular ring structure, and a heat dissipation area is formed between the circular ring structure and the fixing bracket; the arc-shaped part is provided with a plurality of accommodating spaces for accommodating the protruding sections.

[0010] As a further improvement of the present invention, the number of the arc-shaped members is 3-6.

[0011] As a further improvement of the present invention, the fixing bracket includes an annular portion fixed on the rotating shaft and a plurality of connecting portions spaced around the annular portion.

[0012] As a further improvement of the present invention, the arc-shaped member is connected to the connecting portion via a connecting assembly, so that a hollow heat dissipation area is formed between the circular ring structure and the annular portion.

[0013] As a further improvement of the utility model, the connection assembly includes a plurality of connection plates arranged at intervals on the arc-shaped member, a plurality of first connection holes are arranged on the connection plates, and a plurality of second connection holes are arranged on the connection portion corresponding to the first connection holes.

[0014] As a further improvement of the present invention, the annular portion is provided with a reinforcing rib plate.

[0015] As a further improvement of the present invention, the annular portion and the circular ring structure are both coaxially arranged with the rotor core.

[0016] As a further improvement of the present invention, the accommodating space is an accommodating cavity corresponding to the copper conductor bar and arranged with an opening close to one side of the copper conductor bar.

[0017] As a further improvement of the utility model, an insulating plate is arranged in the accommodating cavity.

[0018] As a further improvement of the utility model, the side of the circular ring structure away from the fixing frame is also wrapped with mica tape.

[0019] The beneficial effects of the utility model are:

[0020] 1. The utility model forms a circular ring structure through at least three arc-shaped parts to bear the centrifugal force and impact force on the copper conductor bar. The split design of the circular ring is used to reasonably divert the centrifugal force and impact force, thereby effectively protecting the copper conductor bar, avoiding the copper conductor bar from breaking, and extending the maintenance cycle of the motor. In addition, by fixing the arc-shaped part on the rotor with a fixed bracket, a heat dissipation area is formed between the circular ring structure and the rotor, which can improve the heat dissipation effect of the rotor end while ensuring the connection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The utility model is a schematic diagram of the structure of a device for preventing the copper conductive bar at the end of a motor rotor from breaking.

[0022] Figure 2 The invention is a schematic diagram of the use of a device for preventing the copper bars at the ends of a motor rotor from breaking.

[0023] Figure 3 A schematic diagram of the structure of the fixed bracket.

[0024] Figure 4 It is a schematic diagram of the structure of the copper conductor bar fixing part and the connecting component.

[0025] Figure 5 Schematic diagram of the structure of the insulation board.

[0026] Figure 6 It is a schematic diagram of the position of the insulating plate in the accommodating cavity.

[0027] Reference numerals

[0028] 11. rotor core; 111. copper conductor bar; 12. rotating shaft; 13. end ring; 20. arc-shaped member; 21. accommodating cavity; 211. insulating plate; 30. connecting piece; 31. first connecting hole; 41. annular portion; 42. connecting portion; 421. second connecting hole; 50. mica tape; 60. heat dissipation area. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0031] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0032] See also Figure 1-Figure 2 As shown, the utility model provides a device for preventing the copper bars at the end of the motor rotor from breaking, comprising:

[0033] The rotor assembly comprises a rotor core 11 and a rotating shaft 12 located in the middle of the rotor core 11, wherein the rotor core 11 is provided with a plurality of copper bars 111 at intervals in the circumferential direction, and the copper bars 111 have protruding sections along the axial direction of the rotor core 11;

[0034] A fixed bracket, fixed on the rotating shaft 12;

[0035] The copper conductor bar fixing member includes at least three arc-shaped members 20 connected to the fixing bracket through a connecting assembly, so that all the arc-shaped members 20 together form a circular ring structure, and a heat dissipation area 60 is formed between the circular ring structure and the fixing bracket; the arc-shaped member 20 is provided with a plurality of accommodating spaces for accommodating the extended sections, so that the extended sections of the copper conductor bars 111 extend into the accommodating spaces, and the fixed bracket is used to ensure that the arc-shaped member 20 and the rotor core 11 rotate synchronously during the rotation process, so that the arc-shaped member 20 can bear the centrifugal force and impact force on the copper conductor bars 111, and then the arc-shaped member 20 and the fixing bracket are used to realize effective protection of the copper conductor bars 111.

[0036] Specifically, the number of arc-shaped members 20 is 3-6. If the number of arc-shaped members 20 is less than 3, for example, if only 2 are provided, the number of copper conductive bars 111 accommodated on each arc-shaped member 20 will increase significantly. As a protective member, the arc-shaped member 20 will bear a significantly increased force from the copper conductive bars 111. Accordingly, the requirements for the connection stability between the arc-shaped member 20 and the fixed bracket will increase significantly. The circular ring structure obtained by providing at least 3 arc-shaped members 20 can reasonably divert the centrifugal force and impact force, thereby avoiding the overall centrifugal force of the copper conductive bars 111 being too large during the start and stop of the motor, resulting in an increase in the motor current and causing the motor to heat up. If the number of arc-shaped members 20 provided is greater than 6, the number of connection components will increase significantly, which will lead to certain safety issues. In addition, there will also be coaxiality issues.

[0037] Exemplarily, the number of arc-shaped members 20 is three, and the three arc-shaped members 20 together form a circular ring structure. Compared with the existing one-piece circular ring that carries too much concentrated stress, the circular ring structure of the utility model can better achieve stress dispersion.

[0038] Specifically, Figure 3 As shown, the fixed bracket includes an annular portion 41 fixed on the rotating shaft 12 and a plurality of connecting portions 42 spaced around the annular portion 41 ; the arc-shaped member 20 is connected to the connecting portion 42 via a connecting assembly, so that a hollow heat dissipation area 60 is formed between the circular ring structure and the annular portion 41 .

[0039] Specifically, Figure 4 As shown, the connection assembly includes a plurality of connection pieces 30 arranged at intervals on the arc-shaped member 20, a plurality of first connection holes 31 are arranged on the connection piece 30, and a plurality of second connection holes 421 are arranged on the connection portion 42 corresponding to the first connection holes 31, and the arc-shaped member 20 and the connection portion 42 can be fixed by passing bolts through the first connection holes 31 and the second connection holes 421 in sequence. Exemplarily, three connection pieces 30 are arranged at intervals on the arc-shaped member 20.

[0040] Specifically, the annular portion 41 is provided with a reinforcing rib plate.

[0041] Specifically, the inner diameter of the annular structure is greater than the outer diameter of the annular portion 41 , and the outer diameter of the annular structure is equal to the outer diameter of the rotor core 11 .

[0042] For example, Figure 1 and Figure 2 As shown, the accommodation space is an accommodation cavity 21 corresponding to the copper conductor bar 111 , and the accommodation cavity 21 is opened on one side close to the copper conductor bar 111 .

[0043] Specifically, an insulating plate 211 is disposed in the accommodating cavity 21. For example, Figure 5 and Figure 6 As shown, the insulating plate 211 is a rectangular structure, on which a groove is provided, the size of the groove is adapted to the copper conductor bar 111, such as a cylindrical shape, and the opening side of the groove faces the center of the circular ring structure.

[0044] Specifically, the side of the circular ring structure away from the fixing frame is also wrapped with a mica tape 50 to enhance the stability of the circular ring structure. The mica tape 50 is impregnated with high-voltage insulating varnish to ensure the insulation effect of the mica tape 50.

[0045] Specifically, when in use, two devices for preventing the copper bars 111 at the end of the motor rotor from breaking are respectively arranged at the driving end and the non-load end of the motor rotor. For example, Figure 2 As shown, end rings 13 are provided at both ends of the rotor core 11. After a plurality of copper bars 111 and the two end rings 13 form a closed loop, a portion of the copper bars 111 still extend out of the end rings 13, i.e., an extended section. A device for preventing the copper bars 111 at the end of the motor rotor from breaking is installed on the rotating shaft 12, so that the extended section of the copper bars 111 is located in the groove portion of the insulating plate 211 in the accommodating space, that is, the arc-shaped member 20 can be used to bear the centrifugal force and impact force exerted on the copper bars 111, and at the same time, the split design of the circular ring structure is used to reasonably divert the centrifugal force and impact force exerted on the copper bars 111 on the rotor core 11, thereby avoiding deformation of the copper bars 111.

[0046] Specifically, the inner diameter of the annular portion 41 of the fixing bracket is fully connected to the rotating shaft 12 by metal welding, and the welding position is polished.

[0047] Exemplarily, before the extended section of the copper conductor bar 111 is inserted into the accommodation space, insulating paper is installed at the gap between adjacent copper conductor bars 111, so that the copper conductor bar 111 and the arc member 20 are kept insulated by the insulating plate 211 and the insulating paper.

[0048] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.

Claims

1. A device for preventing the copper bars at the end of a motor rotor from breaking, characterized in that: include: The rotor assembly comprises a rotor core and a rotating shaft located in the middle of the rotor core, wherein a plurality of copper bars are arranged at intervals in the circumferential direction of the rotor core, and the copper bars have a protruding section along the axial direction of the rotor core; A fixed bracket, fixed on the rotating shaft; The copper conductor fixing part comprises at least three arc-shaped parts connected to the fixing bracket through a connecting assembly, so that all the arc-shaped parts together form a circular ring structure, and a heat dissipation area is formed between the circular ring structure and the fixing bracket; the arc-shaped part is provided with a plurality of accommodating spaces for accommodating the protruding sections.

2. The device for preventing the copper bars at the ends of the motor rotor from breaking according to claim 1, characterized in that: The number of the arc-shaped parts is 3-6.

3. The device for preventing the copper bars at the ends of the motor rotor from breaking according to claim 1, characterized in that: The fixing bracket comprises an annular portion fixed on the rotating shaft and a plurality of connecting portions spaced around the annular portion.

4. The device for preventing the copper bars at the ends of the motor rotor from breaking according to claim 3, characterized in that: The arc-shaped member is connected to the connecting portion via a connecting assembly, so that a hollow heat dissipation area is formed between the circular ring structure and the annular portion.

5. The device for preventing the copper bars at the ends of the motor rotor from breaking according to claim 4, characterized in that: The connection assembly comprises a plurality of connection plates arranged at intervals on the arc-shaped member, a plurality of first connection holes are arranged on the connection plates, and a plurality of second connection holes are arranged on the connection portion corresponding to the first connection holes.

6. The device for preventing the copper bars at the ends of the motor rotor from breaking according to claim 3, characterized in that: The annular portion is provided with a reinforcing rib plate.

7. The device for preventing the copper bars at the ends of the motor rotor from breaking according to claim 3, characterized in that: The annular portion and the circular ring structure are both coaxially arranged with the rotor core.

8. The device for preventing the copper bars at the ends of the motor rotor from breaking according to claim 1, characterized in that: The accommodation space is an accommodation cavity corresponding to the copper conductor bar and arranged with an opening on one side close to the copper conductor bar.

9. The device for preventing the copper bars at the ends of the motor rotor from breaking according to claim 8, characterized in that: An insulating plate is arranged in the accommodating cavity.

10. The device for preventing the copper bars at the ends of the motor rotor from breaking according to claim 1, characterized in that: The side of the circular ring structure away from the fixing frame is also wrapped with a mica tape.

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