High-torque double-squirrel-cage rotor structure

Abstract

The invention 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 core installed on the rotating shaft, a lower cage assembly is installed on the rotor core, and an upper cage assembly is arranged on the outer side of the upper 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] The present invention relates to the technical field of squirrel-cage rotors, and particularly to a high-torque double squirrel-cage rotor structure. Background Art

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

[0003] In addition to bearing thermal stress, electromagnetic force, and centrifugal force, the welded cage winding also bears the bending moment generated by the tangential stress during motor acceleration or deceleration at the part where the bar extends out of the slot opening. The thermal stress caused by uneven heating of each part of the cage winding can cause cracks or even fractures in the bars. The action of the electromagnetic force will cause the bars to vibrate in the slots, leading to fatigue failure. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a high-torque double squirrel-cage rotor structure, which solves the problems mentioned in the above background.

[0005] The present invention provides the following technical solutions: A high-torque double squirrel-cage rotor structure, comprising: a rotating shaft and a rotor core mounted on the rotating shaft, a lower cage assembly is mounted on the rotor core, and an upper cage assembly is arranged outside the upper cage assembly;

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

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

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

[0009] Preferably, the rotor core is provided with multiple first through slots for mounting the lower cage bars and multiple second through slots for mounting the upper cage bars.

[0010] Preferably, a packing groove is provided at the position where the end of the lower cage bar is connected to the lower end ring, and the inside of the packing groove is filled with aluminum wire solder. The aluminum wire solder is filled in the packing groove to form a welding layer.

[0011] Preferably, a limiting portion is provided on the lower end ring, the surface of the limiting portion is connected to the surface of the lower cage bar, a clamping groove is provided on the surface of the upper end ring, and the end of the upper cage bar is clamped to the inner wall of the clamping groove.

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

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

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

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

[0016] In this high-torque double-cage rotor structure, by providing 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, the motor loss and heat generation are reduced, and at the same time, the torque curve is stable and conforms to the actual working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is the present invention Figure 1 The enlarged structural diagram at A in.

[0019] In the figure: 1, rotating shaft; 2, rotor core; 3, lower cage assembly; 31, lower end ring; 32, lower cage bar; 4, upper cage assembly; 41, upper end ring; 42, upper cage bar; 5, first through groove; 6, second through groove; 7, packing groove; 8, welding layer; 9, limiting portion; 10, clamping groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figure 1-2 , a high-torque double-cage rotor structure, including: 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 arranged outside the upper cage assembly 4;

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

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

[0024] The plurality of lower cage bars 32 are evenly arranged circumferentially along the lower end ring 31, and the plurality of upper cage bars 42 are evenly arranged circumferentially along the upper end ring 41. The lower cage bars 32 are located on the side of the upper cage bars 42 close to the rotating shaft 1.

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

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

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

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

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

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

Claims

1. A high-torque double-cage rotor structure, characterized in that, Comprising: 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 arranged outside the upper cage assembly (4); The lower cage assembly (3) includes two lower end rings (31) and a plurality of lower cage bars (32) mounted on the rotor core (2). The plurality of lower cage bars (32) are located between the two lower end rings (31), and the ends of the lower cage bars (32) are connected to the surfaces of the lower end rings (31); The upper cage assembly (4) includes two upper end rings (41) and a plurality of upper cage bars (42) mounted on the rotor core (2). The plurality of upper cage bars (42) are located between the two upper end rings (41), and the ends of the upper cage bars (42) are connected to the surfaces of the upper end rings (41). The upper end rings (41) are coaxially arranged with the lower end rings (31), and the upper end rings (41) are located on the side of the lower end rings (31) away from the rotor core (2).

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

3. A high-torque double-cage rotor structure according to claim 2, characterized in that, A plurality of first through grooves (5) for mounting the lower cage bars (32) and a plurality of second through grooves (6) for mounting the upper cage bars (42) are provided on the rotor core (2).

4. A high-torque double-cage rotor structure according to claim 1, characterized in that, A filler groove (7) is formed at the position where the end of the lower cage bar (32) is connected to the lower end ring (31), and the inside of the filler groove (7) is filled with aluminum wire solder. The aluminum wire solder is filled in the filler groove (7) to form a welding layer (8).

5. A high-torque double-cage rotor structure according to claim 4, characterized in that A limiting portion (9) is provided on the lower end ring (31), the surface of the limiting portion (9) is connected to the surface of the lower cage bar (32), a clamping groove (10) is provided on the surface of the upper end ring (41), and the inner wall of the clamping groove (10) is clamped with the end of the upper cage bar (42).

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

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

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

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