A motor rotor structure

Abstract

This invention discloses a motor rotor structure, comprising: a shaft with an annular shoulder having an increased outer diameter on its outer wall; multiple rotor laminations sequentially stacked around the outer circumference of the shaft; a first pressure ring with a limiting groove, wherein at least a portion of the annular shoulder is engaged in the limiting groove to provide radial and axial limiting for the first pressure ring and the shaft; a second pressure ring that cooperates with the first pressure ring to clamp the multiple rotor laminations; a reinforcing structure for pressing and fixing the second pressure ring toward the direction of the first pressure ring; guide bars axially passing through the rotor laminations; and at least two end rings fitted around the outside of the first and second pressure rings to hold the guide bars at both axial ends. This invention utilizes the annular shoulder and the first pressure ring to achieve a limiting fit, reducing assembly difficulty. Simultaneously, the first and second pressure rings provide stable support for the end rings, ensuring that the motor rotor structure does not undergo harmful deformation under high temperature and high speed conditions, resulting in high structural stability.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, and in particular relates to a motor rotor structure. Background Technology

[0002] The rotor is the rotating part of the electric motor, and the operating torque of the motor is output from the rotor shaft. The motor rotor usually consists of a rotor core, guide bars located on the outside of the rotor core, and two end rings welded together. During the welding process, clamps are needed to fix the guide bars, and the rotor core must also be relatively fixed, which brings certain difficulties to the assembly. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a motor rotor structure that is easy to limit assembly, has high structural stability after assembly, and is compact in structure.

[0004] The technical solution adopted by this invention to solve its technical problem is: a motor rotor structure, comprising:

[0005] The pivot has an annular shoulder with an increased outer diameter on its outer wall;

[0006] Multiple rotor laminations are sequentially stacked around the outer circumference of the shaft;

[0007] The first pressure ring has a limiting groove, and at least a portion of the annular shoulder plate is engaged in the limiting groove so that the first pressure ring and the rotating shaft form radial and axial limiting.

[0008] The second pressure ring cooperates with the first pressure ring to clamp multiple rotor laminations;

[0009] A reinforcing structure is used to press and fix the second pressure ring toward the direction of the first pressure ring;

[0010] Guide bars are axially inserted into the rotor laminations;

[0011] At least two end rings are fitted outside the first and second pressure rings to press the guide bar at both ends in the axial direction.

[0012] This invention utilizes an annular shoulder platform and a first pressure ring to achieve a limiting fit, reducing assembly difficulty. Simultaneously, the first and second pressure rings provide stable support for the end ring, ensuring the motor rotor structure does not undergo harmful deformation under high temperature and high speed conditions, resulting in high structural stability. The first and second pressure rings support the end ring and press against the rotor laminations, ensuring close contact between the end ring and the rotor laminations. The first and second pressure rings, along with the shaft and rotor laminations, form an integral unit. The end ring is welded to the guide bars and rotor laminations to form a single unit. The design is very compact, with no redundant structures, thus shortening the rotor length and reducing rotor weight. All components become a single unit, achieving the most ideal critical speed and excellent structural strength under high temperature and high speed conditions.

[0013] Furthermore, the reinforcing structure includes an opening groove on the outer ring of the shaft and an abutment member engaged in the opening groove. The abutment member abuts against the second pressure ring to press it toward the direction of the first pressure ring.

[0014] Furthermore, the abutment is welded and fixed to the rotating shaft and / or the second pressure ring. The design of the reinforcement structure is simple. First, the abutment is inserted into the opening groove to achieve abutment between the abutment and the second pressure ring, and then it is welded and fixed, which reduces the installation difficulty. After installation, the overall structure has high stability and ensures the structural strength under high-speed motor operation.

[0015] Furthermore, a retaining ring is fitted around the outer side of the end ring, with its outer ring flush with the outer ring of the rotor lamination. The retaining ring, together with the first and second pressure rings, radially clamps the end ring, ensuring that no harmful deformation occurs at the ends of the rotor structure under high temperature and high speed.

[0016] Furthermore, the rotor laminations have multiple circular open rotor slots, and the guide bars are inserted into these slots, with a gap between the outer wall of the guide bars and the inner wall of the rotor slots. To increase the critical speed, it is necessary to compress the core length, reduce the rotor outer diameter, and increase the diameter of the rotor core shaft hole, which inevitably leads to a very high rotor magnetic flux density. Designing the rotor slots as circular with openings, and using special high-strength materials for the rotor laminations, ensures that under high rotor core magnetic flux density conditions, the motor iron loss and motor performance (mainly the power factor) are controlled, and also ensures that the rotor core does not undergo harmful deformation under high temperature and high speed conditions.

[0017] Furthermore, it also includes a balance ring, which has radial and axial balance holes. The balance ring is used for high-speed dynamic balancing of the rotor structure. Balancing does not require disassembling the motor, the overall balancing time is short, and there is no damage to the rotor structure.

[0018] Furthermore, there are two balance rings, located on both sides of the first pressure ring and the second pressure ring respectively; the end face of at least one balance ring abuts against the end face of the annular shoulder platform.

[0019] Furthermore, the guide bar, end ring, and rotor laminations are welded together as a single unit. These multiple components form a cohesive whole, ensuring the motor's structural strength under high-speed conditions and preventing deformation due to high temperature and speed.

[0020] Furthermore, the radial width of one side of the annular shoulder is L, and the radial width of one side of the first pressure ring is S, so L / S is 10%-60%. This achieves a limiting fit between the shaft and the first pressure ring, ensuring the stability of the assembly structure. The volume of the annular shoulder is not too large, reducing the weight of the shaft. The volume of the first pressure ring is also not too large, so the overall weight of the rotor structure is not too large.

[0021] Furthermore, the end ring protrudes axially from the second pressure ring and is located inside the end face of the annular shoulder. In this case, the end ring will not interfere with the installation of the balance ring, and the overall length of the rotor structure can be shortened.

[0022] The beneficial effects of this invention are: the use of annular shoulder platform and first pressure ring to achieve limiting fit reduces assembly difficulty; at the same time, the first and second pressure rings can provide stable support for the end ring, ensuring that the motor rotor structure does not produce harmful deformation under high temperature and high speed conditions, resulting in high structural stability; the design structure is very compact with no redundant structures, thereby shortening the rotor length and reducing rotor weight; all components are integrated into a whole, achieving the most ideal critical speed and good structural strength under high temperature and high speed conditions, ensuring that the ends of the rotor structure do not produce harmful deformation under high temperature and high speed conditions. Attached Figure Description

[0023] Figure 1 This is a perspective view of the present invention.

[0024] Figure 2 This is the front view of the present invention.

[0025] Figure 3 This is a cross-sectional view of the present invention.

[0026] Figure 4 for Figure 3 Enlarged view of the structure at point A in the image.

[0027] Figure 5 for Figure 3 Enlarged view of the structure at point B in the image.

[0028] Figure 6 for Figure 5 A schematic diagram showing the assembly of the connecting parts in the relevant structural section.

[0029] Figure 7 This is a schematic diagram of the rotor lamination in this invention.

[0030] Among them, 1-rotor shaft, 11-annular shoulder platform, 2-rotor lamination, 21-rotor slot, 31-first pressure ring, 311-limiting groove, 32-second pressure ring, 4-reinforcing structure, 41-opening slot, 42-abutting part, 5-end ring, 51-notch, 6-protective ring, 7-balance ring, 71-radial balance hole, 72-axial balance hole. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0032] like Figures 1-3 As shown, a motor rotor structure includes a shaft 1, a plurality of rotor laminations 2 sequentially stacked around the outer periphery of the shaft 1, a first pressure ring 31, a second pressure ring 32 that cooperates with the first pressure ring 31 to clamp the plurality of rotor laminations 2, a reinforcing structure 4, a guide bar axially inserted inside the rotor laminations 2, and at least two end rings 5 ​​respectively sleeved on the outside of the first pressure ring 31 and the second pressure ring 32 for pressing the guide bar at both ends in the axial direction.

[0033] like Figure 3 , Figure 4 As shown, the outer wall of the rotating shaft 1 has an annular shoulder 11 with an increased outer diameter, and the first pressure ring 31 has a limiting groove 311. When the first pressure ring 31 is fitted onto the outside of the rotating shaft 1, at least a portion of the annular shoulder 11 is engaged in the limiting groove 311, thereby creating radial and axial limiting between the first pressure ring 31 and the rotating shaft 1. Figure 3 Taking the direction shown as an example, the axial limit here means that the first pressure ring 31 cannot move to the right relative to the rotating shaft 1, and the radial limit here means that the first pressure ring 31 cannot move up or down relative to the rotating shaft 1.

[0034] The radial width of one side of the annular shoulder 11 is L, and the radial width of one side of the first pressure ring 31 is S. Figure 4 The L / S ratio is 10%-60%. At this point, the limiting fit between the rotating shaft 1 and the first pressure ring 31 can be achieved, ensuring the stability of the assembly structure. The volume of the annular shoulder platform 11 will not be too large, reducing the weight of the rotating shaft 1. The volume of the first pressure ring 31 also does not need to be too large, so the overall weight of the rotor structure will not be too large.

[0035] The reinforcing structure 4 is used to press and fix the second pressure ring 32 toward the direction where the first pressure ring 31 is located. In this embodiment, as... Figure 5 , Figure 6As shown, the reinforcing structure 4 includes an open groove 41 on the outer ring of the rotating shaft 1, and an abutment 42 fitted into the open groove 41. The abutment 42 abuts against the second pressure ring 32, thereby pressing the second pressure ring 32 toward the direction of the first pressure ring 31. Simultaneously, the abutment 42 is welded to the rotating shaft 1, or welded to the second pressure ring 32, or welded to both the rotating shaft 1 and the second pressure ring 32. The abutment 42 can be a C-shaped steel ring with an opening.

[0036] The end ring 5 protrudes axially from the second pressure ring 32 and is located inside the end face of the annular shoulder platform 11. In other words, one end of the end ring 5 is aligned with the second pressure ring 32, and the length of its other end is greater than that of the second pressure ring 32, but less than the sum of the lengths of the second pressure ring 32 and the annular shoulder platform 11. At this time, the end ring 5 will not interfere with the installation of the balance ring 7, and the overall length of the rotor structure can also be shortened. A protective ring 6 is fitted on the outer side of the end ring 5, and its outer ring is flush with the outer ring of the rotor lamination 2. In order to facilitate the assembly between the second pressure ring 32, the first pressure ring 31 and the end ring 5, a notch 51 is formed on the inner wall of the end ring 5 facing the first pressure ring 31 and the second pressure ring 32.

[0037] like Figure 7 As shown, the outer ring of the rotor lamination 2 has multiple rotor slots 21, which are circular and have openings. There is a gap between the inner wall of the slots and the outer wall of the guide bar to reduce the rotor magnetic flux density.

[0038] During assembly, the first pressure ring 31 is fitted onto the outside of the rotating shaft 1, and part of the annular shoulder 11 is inserted into the limiting groove 311 to achieve the limiting fit between the first pressure ring 31 and the rotating shaft 1; multiple rotor laminations 2 are stacked sequentially on the outer periphery of the rotating shaft 1, with the end rotor laminations 2 abutting against the first pressure ring 31; after the rotor laminations 2 are stacked, the guide bar is inserted into the rotor groove 21 of the rotor lamination 2, and then the end ring 5 and the guide bar are installed and welded together. At the same time, the guide bar is welded to the rotor lamination 2, that is, the guide bar, the end ring 5 and the rotor lamination 2 are welded together; the second pressure ring 32 is installed and welded to the second pressure ring 32 and / or the rotating shaft 1 using the reinforcing structure 4, and the assembly of the end retaining rings 6 is completed.

[0039] The motor rotor structure also includes a balance ring 7, which has radial balance holes 71 and axial balance holes 72. The balance ring 7 is used for high-speed dynamic balancing of the rotor structure. During balancing, the motor does not need to be disassembled, the overall balancing time is short, and there is no damage to the rotor structure. There are two balance rings 7, located on both sides of the first pressure ring 31 and the second pressure ring 32, respectively. The end face of the balance ring 7 located near the first pressure ring 31 abuts against the end face of the annular shoulder platform 11, and the two form an axial limiting fit.

[0040] The above specific embodiments are used to explain and illustrate the present invention, but not to limit the present invention. Any modifications and changes made to the present invention within the spirit and scope of the claims shall fall within the protection scope of the present invention.

Claims

1. An electric machine rotor structure, characterized in that, The utility model relates to a rotor lamination structure of a rotating electrical machine, comprising: a rotating shaft (1) with an annular shoulder (11) of increasing diameter; a plurality of rotor laminations (2) stacked on the rotating shaft (1); a first pressing ring (31) with a limiting groove (311) into which at least part of the annular shoulder (11) is inserted so that the first pressing ring (31) and the rotating shaft (1) are radially and axially limited; a second pressing ring (32) cooperating with the first pressing ring (31) to hold the plurality of rotor laminations (2); a reinforcing structure (4) for pressing the second pressing ring (32) towards the first pressing ring (31); the reinforcing structure (4) comprises an opening slot (41) provided on the outer periphery of the rotating shaft (1), and an abutting member (42) inserted into the opening slot (41) and abutting against the second pressing ring (32) to press the second pressing ring (32) towards the first pressing ring (31); a guide bar axially inserted into the rotor laminations (2); at least two end rings (5) provided on the outer periphery of the first pressing ring (31) and the second pressing ring (32) to axially hold the guide bar; the single-side radial width of the annular shoulder (11) is L, and the single-side radial width of the first pressing ring (31) is S, so that L / S is 10%-60%.

2. The electric machine rotor structure of claim 1, wherein: The abutting member (42) is welded to the rotating shaft (1) or / and the second pressing ring (32).

3. The electric machine rotor structure of claim 1, wherein: The outer periphery of the end ring (5) is provided with a protective ring (6) whose outer periphery is flush with the outer periphery of the rotor lamination (2).

4. The electric machine rotor structure of claim 1, wherein: The rotor lamination (2) is provided with a plurality of circular rotor slots (21), and the guide bar is inserted into the rotor slots (21) and leaves a gap between the outer wall of the guide bar and the inner wall of the rotor slots (21).

5. The electric machine rotor structure of claim 1, wherein: The utility model also comprises a balance ring (7) provided with a radial balance hole (71) and an axial balance hole (72).

6. The electric machine rotor structure of claim 5, wherein: The number of the balance ring (7) is two, and the balance ring (7) is provided on the two sides of the first pressing ring (31) and the second pressing ring (32); the end face of at least one balance ring (7) abuts against the end face of the annular shoulder (11).

7. The electric machine rotor structure of claim 1, wherein: The guide bar, the end ring (5) and the rotor lamination (2) are welded together.

8. The electric machine rotor structure of claim 1, wherein: The end ring (5) axially protrudes from the second pressing ring (32) and is located inside the end face of the annular shoulder (11).

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