High-torque double-squirrel-cage rotor structure

Abstract

The utility model relates to the technical field of squirrel-cage rotors, and discloses a high-torque double-squirrel-cage rotor structure, which comprises a rotating shaft and a rotor iron core arranged on the rotating shaft, a lower cage assembly is arranged on the rotor iron core, and an upper cage assembly is arranged on the outer side of the lower cage assembly; the lower cage assembly comprises two lower end rings and a plurality of lower cage conducting bars mounted on the rotor core, the plurality of lower cage conducting bars are located between the two lower end rings, and the end parts of the lower cage conducting bars are connected with the surfaces of the lower end rings; the upper cage assembly comprises two upper end rings and a plurality of upper cage conducting bars installed on the rotor core, the plurality of upper cage conducting bars are located between the two upper end rings, and the end portions of the upper cage conducting bars are connected with the surfaces of the upper end rings. According to the high-torque double-squirrel-cage rotor structure, the lower cage assembly and the upper cage assembly are arranged, and the conductivity of the lower cage assembly and the conductivity of the upper cage assembly are combined, so that the loss and heating of the motor are reduced, and meanwhile, a torque curve is stable and accords with actual working conditions.

Description

Technical Field

[0001] This utility model relates to the field of squirrel cage rotor technology, specifically a high-torque double squirrel cage rotor structure. Background Technology

[0002] A squirrel-cage motor is a type of three-phase asynchronous motor. The squirrel-cage rotor is the rotating part of the squirrel-cage motor. Generally, copper or aluminum rotor coils are cast in slots in the cage shape on the rotor core. This coil is a closed loop that is not connected to other parts, and its main function is to suppress stator current.

[0003] In addition to thermal stress, electromagnetic force, and centrifugal force, welded cage windings also bear the bending moment generated by the tangential stress produced during motor acceleration or braking at the portion of the conductor bars extending from the slots. Uneven heating in different parts of the cage winding causes thermal stress that can lead to cracks or even breakage of the conductor bars. Electromagnetic force will cause the conductor bars to vibrate within the slots, resulting in fatigue failure. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a high-torque dual-squirrel-cage rotor structure, which solves the problems mentioned in the background.

[0005] This utility model provides the following technical solution: a high-torque double squirrel cage rotor structure, comprising: a rotating shaft and a rotor core mounted on the rotating shaft, wherein a lower cage assembly is mounted on the rotor core, and an upper cage assembly is provided on the outer side of the lower cage assembly;

[0006] The lower cage assembly includes two lower end rings and multiple lower cage guide bars mounted on the rotor core. The multiple lower cage guide bars are located between the two lower end rings, and the ends of the lower cage guide bars are connected to the surface of the lower end rings.

[0007] The upper cage assembly includes two upper rings and multiple upper cage guide bars mounted on the rotor core. The multiple upper cage guide bars are located between the two upper rings, and the ends of the upper cage guide bars are connected to the surface of the upper rings. The upper rings are coaxially arranged with the lower rings, and the upper rings are located on the side of the lower rings away from the rotor core.

[0008] Preferably, multiple lower cage guide bars are evenly arranged circumferentially along the lower end, and multiple upper cage guide bars are evenly arranged circumferentially along the upper end, with the lower cage guide bars located on the side of the upper cage guide bars closest to the rotating shaft.

[0009] Preferably, the rotor core is provided with a plurality of first through slots for installing the lower cage guide bars and a plurality of second through slots for installing the upper cage guide bars.

[0010] Preferably, a filling groove is provided at the position where the lower cage guide bar is connected to the lower end ring, and the filling groove is filled with aluminum wire solder, which forms a welding layer in the filling groove.

[0011] Preferably, the lower ring is provided with a limiting part, the surface of the limiting part is connected to the surface of the lower cage guide bar, and the surface of the upper ring is provided with a groove, the inner wall of the groove is engaged with the end of the upper cage guide bar.

[0012] Preferably, the upper cage guide bar is made of copper alloy, the upper end ring is made of copper, and the lower cage guide bar and the lower end ring are both made of aluminum alloy.

[0013] Preferably, the cross-section of the lower cage guide bar is rectangular.

[0014] Preferably, the axial length ratio of the upper cage guide bar to the lower cage guide bar is 1:1.2~1.5.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This high-torque double squirrel-cage rotor structure, by setting up a lower cage assembly and an upper cage assembly, and the combination of the conductivity of the lower cage assembly and the upper cage assembly, reduces motor losses and heat generation, while the torque curve is stable and conforms to actual working conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0019] In the figure: 1. Rotating shaft; 2. Rotor core; 3. Lower cage assembly; 31. Lower end ring; 32. Lower cage guide bar; 4. Upper cage assembly; 41. Upper end ring; 42. Upper cage guide bar; 5. First through slot; 6. Second through slot; 7. Filler slot; 8. Welding layer; 9. Limiting part; 10. Slot. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1-2 A high-torque double squirrel cage rotor structure includes: a rotating shaft 1 and a rotor core 2 mounted on the rotating shaft 1, a lower cage assembly 3 mounted on the rotor core 2, and an upper cage assembly 4 disposed on the outside of the lower cage assembly 3.

[0022] The lower cage assembly 3 includes two lower end rings 31 and multiple lower cage guide bars 32 mounted on the rotor core 2. The multiple lower cage guide bars 32 are located between the two lower end rings 31, and the ends of the lower cage guide bars 32 are connected to the surface of the lower end rings 31.

[0023] The upper cage assembly 4 includes two upper end rings 41 and multiple upper cage guide bars 42 mounted on the rotor core 2. The multiple upper cage guide bars 42 are located between the two upper end rings 41, and the ends of the upper cage guide bars 42 are connected to the surface of the upper end rings 41. The upper end rings 41 and the lower end rings 31 are coaxially arranged, and the upper end rings 41 are located on the side of the lower end rings 31 away from the rotor core 2.

[0024] Multiple lower cage guide bars 32 are evenly arranged around the lower end ring 31, and multiple upper cage guide bars 42 are evenly arranged around the upper end ring 41. The lower cage guide bars 32 are located on the side of the upper cage guide bars 42 that is close to the rotating shaft 1.

[0025] The rotor core 2 is provided with a plurality of first through slots 5 for installing the lower cage guide bar 32 and a plurality of second through slots 6 for installing the upper cage guide bar 42. A filling groove 7 is provided at the position where the lower cage guide bar 32 is connected to the lower end ring 31, and the filling groove 7 is filled with aluminum wire solder, which forms a welding layer 8 in the filling groove 7.

[0026] A limiting part 9 is provided on the lower ring 31, and the surface of the limiting part 9 is connected to the surface of the lower cage guide bar 32. A groove 10 is provided on the surface of the upper ring 41, and the inner wall of the groove 10 is engaged with the end of the upper cage guide bar 42.

[0027] The upper cage guide bar 42 is made of copper alloy, the upper end ring 41 is made of copper, and the lower cage guide bar 32 and the lower end ring 31 are both made of aluminum alloy.

[0028] The cross-section of the lower cage guide bar 32 is rectangular, and the axial length ratio of the upper cage guide bar 42 to the lower cage guide bar 32 is 1:1.2~1.5.

[0029] Multiple lower cage guide bars 32 are sequentially inserted into the first slot 5 of the rotor core 2, and two lower end rings 31 are welded to both ends of the lower cage guide bars 32 respectively. Solder is filled at the connection between the lower end rings 31 and the lower cage guide bars 32, that is, aluminum wire solder is filled into the filling groove 7 for welding to form a weld layer 8. After cooling, the upper cage guide bars 42 are installed. Multiple upper cage guide bars 42 are sequentially inserted into the second slot 6 of the rotor core 2, and two upper end rings 41 are welded to both ends of the upper cage guide bars 42 respectively. The upper cage solder is silver-containing solder. The upper end rings 41 are located outside the lower end rings 31. The upper cage guide bars 42 are made of copper alloy, and the upper end rings 41 are made of copper. The conductivity of copper alloy is 11.5 S / m at 75°C. The lower cage guide bars 32 and the lower end rings 31 are both made of aluminum alloy. The conductivity of aluminum alloy is 24.8 S / m at 75°C. The conductivity is optimized by combining copper alloy and aluminum alloy.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-torque double-squirrel-cage rotor structure, characterized in that, include: A rotating shaft (1) and a rotor core (2) mounted on the rotating shaft (1), a lower cage assembly (3) is mounted on the rotor core (2), and an upper cage assembly (4) is provided on the outside of the lower cage assembly (3). The lower cage assembly (3) includes two lower end rings (31) and multiple lower cage guide bars (32) mounted on the rotor core (2). The multiple lower cage guide bars (32) are located between the two lower end rings (31), and the ends of the lower cage guide bars (32) are connected to the surface of the lower end rings (31). The upper cage assembly (4) includes two upper end rings (41) and multiple upper cage guide bars (42) mounted on the rotor core (2). The multiple upper cage guide bars (42) are located between the two upper end rings (41), and the ends of the upper cage guide bars (42) are connected to the surface of the upper end rings (41). The upper end rings (41) and the lower end rings (31) are coaxially arranged, and the upper end rings (41) are located on the side of the lower end rings (31) away from the rotor core (2). A filling groove (7) is provided at the position where the lower cage guide bar (32) is connected to the lower end ring (31), and the filling groove (7) is filled with aluminum wire solder, and the aluminum wire solder fills the filling groove (7) to form a welding layer (8). The lower end ring (31) is provided with a limiting part (9), the surface of the limiting part (9) is connected to the surface of the lower cage guide bar (32), and the surface of the upper end ring (41) is provided with a groove (10), the inner wall of the groove (10) is engaged with the end of the upper cage guide bar (42).

2. The high-torque double-squirrel-cage rotor structure according to claim 1, characterized in that, Multiple lower cage guide bars (32) are evenly arranged around the lower end ring (31), and multiple upper cage guide bars (42) are evenly arranged around the upper end ring (41). The lower cage guide bars (32) are located on the side of the upper cage guide bars (42) close to the rotating shaft (1).

3. The high-torque double-squirrel-cage rotor structure according to claim 2, characterized in that, The rotor core (2) is provided with a plurality of first through slots (5) for installing the lower cage guide bar (32) and a plurality of second through slots (6) for installing the upper cage guide bar (42).

4. The high-torque double-squirrel-cage rotor structure according to claim 1, characterized in that, The upper cage guide bar (42) is made of copper alloy, the upper end ring (41) is made of copper, and the lower cage guide bar (32) and the lower end ring (31) are both made of aluminum alloy.

5. The high-torque double-squirrel-cage rotor structure according to claim 1, characterized in that, The cross-section of the lower cage guide bar (32) is rectangular.

6. The high-torque double-squirrel-cage rotor structure according to claim 1, characterized in that, The axial length ratio of the upper cage guide bar (42) to the lower cage guide bar (32) is 1:1.2~1.5.

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