Motor rotor

Abstract

The utility model provides a motor rotor, which comprises a rotating shaft, a rotor winding end part and a central ring, the rotating shaft comprises a large-diameter part and a small-diameter part, a step surface is formed between the large-diameter part and the small-diameter part, the rotor winding end part sleeves the periphery of the small-diameter part and has a distance in the radial direction, and the central ring fixedly sleeves the periphery of the small-diameter part and is located at the axial end part of the rotor winding end part. An interval is formed between the inner peripheral wall of the center ring and the peripheral wall of the small-diameter part in the radial direction; the wind area partition plate comprises a radial wind area partition plate body and two axial wind area partition plate bodies, the radial wind area partition plate body extends in the circumferential direction of the small-diameter part, the radial wind area partition plate body is fixedly connected with the center ring, the radial wind area partition plate body is partially installed between the center ring and the small-diameter part, and a limiting groove extending in the axial direction is formed in the circumferential wall of the small-diameter part. The axial wind area partition plate is installed between the rotor winding end portion and the small-diameter portion, and the radial inner end of the axial wind area partition plate is clamped in the limiting groove and installed between the step face and the radial wind area partition plate in the axial direction in a limiting mode. According to the embodiment, reliable constraint of the wind area partition plate is achieved.

Description

Technical Field

[0001] This application relates to the technical field of motors, and more particularly to motor rotors. Background Art

[0002] To achieve the cooling of the end part of the rotor winding, an electronic rotor usually sets up wind area partitions to divide the circumferential direction into an air inlet area and an air outlet area to realize the circulation of cooling gas. Due to the lack of restraint, the traditional rotor wind area partitions are prone to twisting and deformation, resulting in damage, destroying the rotor air path, causing the overheating of the rotor end part until the insulation fails; after the wind area partitions are deformed, it may lead to uneven circumferential deflection of the motor rotor, resulting in double-frequency vibration; if the wind area partitions are damaged during rotation, the dropped parts may also hit the stator under the action of centrifugal force, causing irreparable damage to the stator, leading to major accidents and endangering the safety of the motor.

[0003] Therefore, how to provide a motor rotor to achieve reliable restraint of the wind area partitions, improve the installation stability of the wind area partitions, ensure the cooling effect of the rotor winding end part, and ensure the safe operation of the motor has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Utility Model

[0004] The purpose of this application is to provide a motor rotor to achieve reliable restraint of the wind area partitions, improve the installation stability of the wind area partitions, ensure the cooling effect of the rotor winding end part, and ensure the safe operation of the motor.

[0005] To solve the above technical problems, this application provides a motor rotor, including a rotating shaft, a rotor winding end part, and a center ring. The rotating shaft includes a large-diameter part and a small-diameter part. The small-diameter part is connected to the axial end of the large-diameter part. A step surface is formed between the large-diameter part and the small-diameter part. The rotor winding end part is sleeved on the outer periphery of the small-diameter part. There is a spacing between the inner contour of the rotor winding end part and the peripheral wall of the small-diameter part in the radial direction. The center ring is fixedly sleeved on the outer periphery of the small-diameter part and is located at the axial end of the rotor winding end part. The center ring is configured to axially limit the rotor winding end part. There is a spacing between the inner peripheral wall of the center ring and the peripheral wall of the small-diameter part in the radial direction;

[0006] It further includes wind area partitions. The wind area partitions include a radial wind area partition and two axial wind area partitions. The radial wind area partition extends along the circumferential direction of the small-diameter part. The radial wind area partition is fixedly connected to the center ring. The radial wind area partition is partially installed between the center ring and the small-diameter part. The peripheral wall of the small-diameter part is provided with a limiting groove extending axially. The axial wind area partition is installed between the rotor winding end part and the small-diameter part. The radial inner end of the axial wind area partition is clamped inside the corresponding limiting groove. The axial wind area partition is axially limited and installed between the step surface and the radial wind area partition.

[0007] In this embodiment, the fixing method of the traditional air-zone partition of the motor rotor is changed. The radial air-zone partition is fixedly connected to the central ring to achieve reliable fixation of the radial air-zone partition. The axial air-zone partition is partially embedded in the limiting groove on the rotating shaft to achieve radial and tangential constraints on the axial air-zone partition. The axial air-zone partition is axially limited and installed between the step surface and the radial air-zone partition to achieve axial constraint on the axial air-zone partition, thereby achieving reliable fixation of the axial air-zone partition.

[0008] It can be seen that the motor rotor in this embodiment can achieve reliable constraint on the air-zone partition, improve the installation stability of the air-zone partition, avoid deformation and damage of the air-zone partition, and improve the cooling effect of the end winding of the rotor.

[0009] Optionally, a connection groove is correspondingly provided on the wall of the radial air-zone partition facing the step surface and the step surface, and the axial end of the axial air-zone partition is clamped inside the corresponding connection groove.

[0010] Optionally, the wall of the radial air-zone partition facing the step surface is provided with a concave recess, and the recess forms the connection groove.

[0011] Optionally, the radial air-zone partition is provided with a weight-reducing groove.

[0012] Optionally, the weight-reducing groove is provided on the wall of the radial air-zone partition facing the small-diameter part, extends along the length direction of the radial air-zone partition, and is located between the two connection grooves.

[0013] Optionally, the radial air-zone partition includes a main body part and a folding part arranged at an angle. The main body part is installed between the inner peripheral wall of the central ring and the peripheral wall of the small-diameter part. At least part of the wall of the main body part facing the small-diameter part is attached to the peripheral wall of the small-diameter part, and at least part of the wall of the main body part facing the central ring is attached to the inner peripheral wall of the central ring. The folding part is attached to and fixedly connected to the end wall of the central ring facing away from the end of the rotor winding.

[0014] Optionally, the main body part includes a thick section and a thin section connected axially. The folding part is connected to the thin section. The walls of the thick section and the thin section facing the central ring are flush. The walls of the thick section and the thin section facing the central ring are attached to the inner peripheral wall of the central ring. At least one annular protrusion is provided on the wall of the thick section facing the small-diameter part, and the annular protrusion is attached to the peripheral wall of the small-diameter part.

[0015] Optionally, at least one via hole is provided in the folding portion, a threaded hole is correspondingly provided in the end wall of the central ring facing away from the end of the rotor winding, and a threaded connecting member is further included. The threaded connecting member passes through the inside of the via hole, and the threaded connecting member is axially limited and connected to the via hole and is screwed and fixed to the corresponding threaded hole.

[0016] Optionally, the axial air zone partition is made of epoxy phenolic laminated glass cloth board.

[0017] Optionally, the radial air zone partition is made of aluminum alloy material. Description of the Drawings

[0018] Figure 1 It is a partial axial sectional view of a specific embodiment of the motor rotor provided by this application;

[0019] Figure 2 It is Figure 1 a schematic structural diagram of the rotating shaft and the air zone partition in the motor rotor;

[0020] Figure 3 It is Figure 1 a schematic structural diagram of the air zone partition at the first angle;

[0021] Figure 4 It is Figure 1 a schematic structural diagram of the air zone partition at the second angle;

[0022] Figure 5 It is Figure 1 a schematic structural diagram of the air zone partition at the third angle;

[0023] Among them, Figures 1-5 the reference numerals in are as follows:

[0024] 1 - rotating shaft; 11 - large diameter part; 12 - small diameter part; 12a - limiting groove; A - step surface;

[0025] 2 - end of rotor winding;

[0026] 3 - central ring;

[0027] 4 - air zone partition; 41 - radial air zone partition; 411 - main body part; 411a - thick section; 411b - thin section; a - annular protruding part; 412 - folding part; 41a - connecting groove; 41b - weight reduction groove; 41c - via hole; 42 - axial air zone partition;

[0028] 5 - threaded connecting member;

[0029] 6 - retaining ring. Detailed Embodiment

[0030] To enable those skilled in the art to better understand the technical solution of this application, the following further details this application in conjunction with the accompanying drawings and specific embodiments.

[0031] Please refer to Figures 1-2 , Figure 1 which is a partial axial sectional view of a specific embodiment of the motor rotor provided by this application; Figure 2 is Figure 1 a schematic structural view of the rotating shaft and the wind area partition in the motor rotor.

[0032] This embodiment provides a motor rotor, including a rotating shaft 1, a rotor winding end 2, and a center ring 3. The rotating shaft 1 includes a large-diameter portion 11 and a small-diameter portion 12. The small-diameter portion 12 is connected to the axial end of the large-diameter portion 11. A step surface A is formed between the large-diameter portion 11 and the small-diameter portion 12. The rotor winding end 2 is sleeved on the outer periphery of the small-diameter portion 12. There is a gap between the inner contour of the rotor winding end 2 and the peripheral wall of the small-diameter portion 12 in the radial direction. The center ring 3 is fixedly sleeved on the outer periphery of the small-diameter portion 12 and is located at the axial end of the rotor winding end 2. The center ring 3 is configured to axially limit the rotor winding end 2. There is a gap between the inner peripheral wall of the center ring 3 and the peripheral wall of the small-diameter portion 12 in the radial direction;

[0033] It further includes a wind area partition 4. The wind area partition 4 includes a radial wind area partition 41 and two axial wind area partitions 42. The radial wind area partition 41 extends along the circumferential direction of the small-diameter portion 12. The radial wind area partition 41 is fixedly connected to the center ring 3. The radial wind area partition 41 is partially installed between the center ring 3 and the small-diameter portion 12. The peripheral wall of the small-diameter portion 12 is provided with an axially extending limiting groove 12a. The axial wind area partition 42 is installed between the rotor winding end 2 and the small-diameter portion 12. The radial inner end of the axial wind area partition 42 is clamped inside the corresponding limiting groove 12a. The axial wind area partition 42 is axially limited and installed between the step surface A and the radial wind area partition 41.

[0034] In this embodiment, the motor rotor changes the fixing method of the traditional wind area partition 4. The radial wind area partition 41 is fixedly connected to the center ring 3 to achieve reliable fixation of the radial wind area partition 41. The axial wind area partition 42 is partially embedded inside the limiting groove 12a on the rotating shaft 1 to achieve radial and tangential constraints of the axial wind area partition 42. The axial wind area partition 42 is axially limited and installed between the step surface A and the radial wind area partition 41 to achieve axial constraint of the axial wind area partition 42, thereby achieving reliable fixation of the axial wind area partition 42.

[0035] It can be seen that the motor rotor in this embodiment can achieve reliable constraint of the wind area partition 4, improve the installation stability of the wind area partition 4, avoid deformation and damage of the wind area partition 4, solve the technical problems caused by deformation and damage of the wind area partition 4 in the prior art, improve the cooling effect of the rotor winding end 2, and ensure the safe operation of the motor.

[0036] Please refer to Figures 3-5 , Figure 3 which is Figure 1 a schematic structural diagram of the first angle of the wind area partition board; Figure 4 which is Figure 1 a schematic structural diagram of the second angle of the wind area partition board; Figure 5 which is Figure 1 a schematic structural diagram of the third angle of the wind area partition board.

[0037] In this embodiment, a connecting groove 41a is correspondingly provided on the wall of the radial wind area partition board 41 facing the step surface A and the step surface A, and the axial end of the axial wind area partition board 42 is clamped inside the corresponding connecting groove 41a.

[0038] With the above settings, both ends of the axial wind area partition board 42 are clamped inside the corresponding connecting grooves 41a, and the radial wind area partition board 41 and the step surface A can further achieve tangential restraint on the axial wind area partition board 42, further improving the installation stability of the axial wind area partition board 42.

[0039] In practice, the width of the connecting groove 41a can be approximately equal to the thickness of the axial wind area partition board 42.

[0040] It can be seen that Figures 2-4 in this embodiment, the wall of the radial wind area partition board 41 facing the step surface A is provided with an inward concave recessed portion, and the recessed portion forms the aforementioned connecting groove 41a.

[0041] Of course, in practice, the connecting groove 41a can also have other implementation methods. For example, it is also feasible that the wall of the radial wind area partition board 41 facing the step surface A is provided with a protruding portion, and the aforementioned connecting groove 41a is formed inside the protruding portion.

[0042] Please continue to refer to Figure 4 , in this embodiment, the radial wind area partition board 41 is provided with a weight-reducing groove 41b to reduce the weight of the radial wind area partition board 41, reduce the centrifugal force when the radial wind area partition board 41 rotates at high speed with the rotor, and improve the installation reliability of the radial wind area partition board 41.

[0043] It can be seen that Figure 4 in this embodiment, the weight-reducing groove 41b penetrates through the wall of the radial wind area partition board 41 facing the small-diameter portion 12, the weight-reducing groove 41b extends along the length direction of the radial wind area partition board 41, and the weight-reducing groove 41b is located between the two connecting grooves 41a.

[0044] In practice, the weight-reducing groove 41b is not limited to the above structural form. For example, the weight-reducing groove 41b can be in the shape of a round hole; the number of the weight-reducing grooves 41b can be multiple; it is also feasible that the weight-reducing groove 41b penetrates through the wall of the radial wind area partition board 41 facing the central ring 3.

[0045] Please continue to refer toFigure 3 and Figure 4 In this embodiment, the radial wind area partition plate 41 includes a main body portion 411 and a folding portion 412 arranged at an angle. The main body portion 411 is installed between the inner peripheral wall of the central ring 3 and the peripheral wall of the small-diameter portion 12. At least part of the wall portion of the main body portion 411 facing the small-diameter portion 12 is attached to the peripheral wall of the small-diameter portion 12, and at least part of the wall portion of the main body portion 411 facing the central ring 3 is attached to the inner peripheral wall of the central ring 3. The folding portion 412 is attached to and fixedly connected to the end wall of the central ring 3 facing away from the end of the rotor winding 2.

[0046] With the above arrangement, the folding portion 412 plays a fixing role to realize the reliable connection between the radial wind area partition plate 41 and the central ring 3. The main body portion 411 plays a flow-blocking role to reduce the outflow of the cooling gas from the gap between the outer peripheral wall of the main body portion 411 and the inner peripheral wall of the central ring 3, so that the cooling gas fully exchanges heat with the end of the rotor winding 2, reduces the temperature rise of the end of the rotor winding 2, and ensures the cooling effect of the end of the rotor winding 2.

[0047] Further, in this embodiment, the main body portion 411 includes a thick section 411a and a thin section 411b connected axially. The folding portion 412 is connected to the thin section 411b. The wall portions of the thick section 411a and the thin section 411b facing the central ring 3 are flush. The wall portions of the thick section 411a and the thin section 411b facing the central ring 3 are attached to the inner peripheral wall of the central ring 3. Two annular protrusions a are provided on the wall portion of the thick section 411a facing the small-diameter portion 12. The two annular protrusions a are distributed at intervals along the axial direction of the thick section 411a. The annular protrusion a is attached to the peripheral wall of the small-diameter portion 12.

[0048] With the above arrangement, the main body portion 411 is attached to the peripheral wall of the small-diameter portion 12 through the annular protrusion a, reducing the contact area between the main body portion 411 and the small-diameter portion 12, reducing the installation resistance of the main body portion 411, and facilitating the installation and disassembly of the radial wind area partition plate 41.

[0049] In this embodiment, two annular protrusions a are provided on the wall portion of the thick section 411a facing the small-diameter portion 12. In practice, the number of annular protrusions a provided on the wall portion of the thick section 411a facing the small-diameter portion 12 is not limited. For example, the number of annular protrusions a provided on the wall portion of the thick section 411a facing the small-diameter portion 12 can be at least one.

[0050] As Figure 5 shown, in this embodiment, the folding portion 412 is provided with a through hole 41c. A threaded hole is correspondingly provided on the end wall of the central ring 3 facing away from the end of the rotor winding 2. A threaded connecting piece 5 is further included. The threaded connecting piece 5 passes through the inside of the through hole 41c. The threaded connecting piece 5 is axially limited and connected to the through hole 41c and is screwed and fixed to the corresponding threaded hole.

[0051] Thus, the radial air zone partition plate 41 is fixedly connected to the central ring 3 through the threaded connecting piece 5, with reliable connection and convenient disassembly and assembly. Among them, the threaded connecting piece 5 can be a locking bolt. The through hole 41c includes a large-diameter section and a small-diameter section connected axially. An abutting wall is formed between the large-diameter section and the small-diameter section. The abutting wall faces away from the central ring 3. The head of the locking bolt is located inside the large-diameter section and abuts against the abutting wall. The rod portion of the locking bolt passes through the inside of the small-diameter section and is screwed and fixed to the corresponding threaded hole.

[0052] In practice, the through hole 41c is not limited to the above structural form. For example, it is also feasible not to set the large-diameter section in the through hole 41c. In the connected state, the head of the locking bolt is located on the side of the folding portion 412 facing away from the central ring 3 and abuts against the side wall of the folding portion 412 facing away from the central ring 3.

[0053] In this embodiment, the number of through holes 41c provided in the folding portion 412 is multiple, and the multiple through holes 41c are spaced apart along the extending direction of the folding portion 412. In practice, the number of through holes 41c provided in the folding portion 412 can be at least one. The radial air zone partition plate 41 is fixedly connected to the central ring 3 through at least one threaded connecting piece 5, as long as the reliable connection between the radial air zone partition plate 41 and the central ring 3 can be ensured.

[0054] In this embodiment, the axial air zone partition plate 42 is made of epoxy phenolic laminated glass cloth board. The epoxy phenolic laminated glass cloth board has good mechanical and dielectric properties and is suitable for being used as insulating structure parts in motors and electrical equipment.

[0055] In this embodiment, the material of the radial air zone partition plate 41 includes but is not limited to metal materials such as aluminum alloy, effectively increasing the structural strength of the radial air zone partition plate 41.

[0056] In addition, in this embodiment, the electronic rotor further includes a retaining ring 6. After the retaining ring 6 is heated and expanded, it is thermally sleeved onto the large-diameter section of the rotating shaft 1 and the central ring 3 to fix the central ring 3. The end portion 2 of the rotor winding is located inside the retaining ring 6.

[0057] The above is only the preferred embodiment of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present application.

Claims

1. A motor rotor, characterized in that: The invention comprises a rotating shaft (1), a rotor winding end (2) and a center ring (3), wherein the rotating shaft (1) comprises a large diameter portion (11) and a small diameter portion (12), wherein the small diameter portion (12) is connected to the axial end of the large diameter portion (11), and a step surface (A) is formed between the large diameter portion (11) and the small diameter portion (12); the rotor winding end (2) is sleeved on the outer periphery of the small diameter portion (12), and the inner contour of the rotor winding end (2) and the peripheral wall of the small diameter portion (12) have a spacing in the radial direction; the center ring (3) is fixedly sleeved on the outer periphery of the small diameter portion (12) and is located at the axial end of the rotor winding end (2); the center ring (3) is configured to limit the rotor winding end (2) in the axial direction, and the inner peripheral wall of the center ring (3) and the peripheral wall of the small diameter portion (12) have a spacing in the radial direction; The invention also comprises a wind zone partition plate (4), wherein the wind zone partition plate (4) comprises a radial wind zone partition plate (41) and two axial wind zone partition plates (42), wherein the radial wind zone partition plate (41) extends along the circumference of the small diameter portion (12), the radial wind zone partition plate (41) and the center ring (3) are fixedly connected, the radial wind zone partition plate (41) is partially installed between the center ring (3) and the small diameter portion (12), the circumferential wall of the small diameter portion (12) is provided with a limiting groove (12a) extending in the axial direction, the axial wind zone partition plate (42) is installed between the rotor winding end (2) and the small diameter portion (12), the radial inner end of the axial wind zone partition plate (42) is clamped in the corresponding limiting groove (12a), and the axial wind zone partition plate (42) is installed in the axial limiting direction between the step surface (A) and the radial wind zone partition plate (41).

2. The motor rotor according to claim 1, characterized in that: The wall portion of the radial wind zone partition plate (41) facing the step surface (A) and the step surface (A) are provided with connection grooves (41a) correspondingly, and the axial end portion of the axial wind zone partition plate (42) is clamped inside the corresponding connection groove (41a).

3. The motor rotor according to claim 2, characterized in that: The wall portion of the radial wind zone partition plate (41) facing the step surface (A) is provided with an inwardly concave recessed portion, and the recessed portion forms the connecting groove (41a).

4. The motor rotor according to claim 2, characterized in that: The radial wind zone partition plate (41) is provided with a weight-reducing groove (41b).

5. The motor rotor according to claim 4, characterized in that: The weight-reducing groove (41b) is arranged on a wall portion of the radial wind zone partition plate (41) facing the small diameter portion (12); the weight-reducing groove (41b) extends along the length direction of the radial wind zone partition plate (41) and is located between the two connecting grooves (41a).

6. The motor rotor according to any one of claims 1 to 5, characterized in that: The radial wind zone partition plate (41) comprises a main body (411) and a folded portion (412) arranged at an angle, the main body (411) being installed between the inner peripheral wall of the center ring (3) and the peripheral wall of the small diameter portion (12), the wall portion of the main body (411) facing the small diameter portion (12) at least partially abutting against the peripheral wall of the small diameter portion (12), the wall portion of the main body (411) facing the center ring (3) at least partially abutting against the inner peripheral wall of the center ring (3), and the folded portion (412) abutting against and fixedly connected to the end wall of the center ring (3) facing away from the rotor winding end (2).

7. The motor rotor according to claim 6, characterized in that: The main body (411) comprises a thick section (411a) and a thin section (411b) connected axially, the folded portion (412) is connected to the thin section (411b), the thick section (411a) and the thin section (411b) are flush with the wall of the center ring (3), the thick section (411a) and the thin section (411b) are in contact with the inner peripheral wall of the center ring (3), and the thick section (411a) is provided with at least one annular protrusion (a) on the wall of the small diameter section (12), and the annular protrusion (a) is in contact with the peripheral wall of the small diameter section (12).

8. The motor rotor according to claim 6, characterized in that: The folded portion (412) is provided with at least one through hole (41c), and an end wall of the center ring (3) facing away from the rotor winding end (2) is correspondingly provided with a threaded hole, and further comprises a threaded connection member (5), wherein the threaded connection member (5) passes through the inside of the through hole (41c), and the threaded connection member (5) and the through hole (41c) are axially limitedly connected and are screwed and fixed to the corresponding threaded hole.

9. The motor rotor according to any one of claims 1 to 5, characterized in that: The axial wind zone partition plate (42) is made of epoxy phenolic laminated glass cloth plate.

10. The motor rotor according to any one of claims 1 to 5, characterized in that: The radial wind zone partition plate (41) is made of aluminum alloy.

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