Rotor assembly and motor

Abstract

The utility model belongs to the technical field of motors, and discloses a rotor assembly and a motor. The rotor assembly comprises a plurality of rotor punching sheets, and the plurality of rotor punching sheets are stacked; each rotor punching sheet is provided with a plurality of sector ring holes, the large circle where the outer arc of each sector ring hole is located and the center hole of the rotor punching sheet are concentrically arranged, the sector ring holes which are correspondingly arranged in the axial direction of the rotor punching sheet are communicated to form a plurality of medium channels, and cooling media are introduced into the medium channels. According to the rotor assembly provided by the utility model, when the rotor rotates at a high speed, the cooling medium can be in full contact with the outer arc of the fan-shaped ring hole under the action of centripetal force, and compared with a round-hole-shaped medium channel in the prior art, the fan-shaped ring hole-shaped medium channel increases the contact area between the cooling medium and the medium channel, so that the service life of the cooling medium is prolonged. The effective cooling heat exchange area is enlarged, and the cooling effect of the rotor assembly is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric motors, in particular to a rotor assembly and an electric motor. Background Art

[0002] During the operation of the electric motor, a large amount of heat is generated, which causes the temperature of the rotor to rise, so the rotor needs to be cooled. In the existing technology, spraying is generally used for cooling. The problem is that only the outer side of the rotor is cooled significantly, and the cooling effect on the part between the center and the punching is poor. By setting a cooling channel on the rotor and passing a low-temperature cooling medium through it, the central part of the rotor can be cooled. However, since the rotor is in a high-speed rotation state during operation, the low-temperature cooling medium in the cooling channel will also generate centripetal force in the medium channel due to the rotation of the rotor, resulting in poor cooling effect of the cooling medium. Increasing the flow rate of the cooling medium will have an adverse effect on the rotor's own working performance. Utility Model Content

[0003] The purpose of the utility model is to provide a rotor assembly and an electric motor, so as to solve the problem that the cooling effect of the cooling medium in the rotor assembly is poor due to the centripetal force.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A rotor assembly includes multiple rotor punchings, which are stacked; each rotor punching is provided with multiple fan ring holes, and the outer arc of each fan ring hole is located in a large circle concentric with the center hole of the rotor punching. Along the axial direction of the rotor punching, the multiple corresponding fan ring holes are connected to form multiple medium channels, and cooling medium is passed through the medium channels.

[0006] In some embodiments, the plurality of fan ring holes are evenly spaced around the central hole, and the outer arcs of the plurality of fan ring holes are located on the same large circle.

[0007] In some embodiments, the inner arcs of the plurality of fan ring holes are located on the same small circle, and the large circle and the small circle are both concentrically arranged with the central hole.

[0008] In some embodiments, along the axial direction of the rotor punching, the plurality of corresponding fan ring holes on the plurality of rotor punchings are staggered and connected along the circumferential direction.

[0009] In some embodiments, the corresponding fan ring holes on two adjacent rotor punchings are staggered in a clockwise direction, and / or the corresponding fan ring holes on two adjacent rotor punchings are staggered in a counterclockwise direction.

[0010] In some embodiments, the rotor assembly further comprises:

[0011] A rotating shaft, wherein the center holes of the plurality of rotor punchings are all formed on the rotating shaft, and the rotating shaft is provided with an axial channel and a plurality of radial channels communicating with the axial channel;

[0012] An end cover is provided at the end of the rotor punching and fixes the rotor punching on the rotating shaft. A plurality of radial grooves are provided on the end cover, and the two ends of the plurality of radial grooves are respectively connected to the plurality of radial channels and the plurality of medium channels in a one-to-one correspondence.

[0013] In some embodiments, there are two end covers, which are respectively arranged at both ends of the multiple rotor punchings, and the two end covers are respectively provided with multiple radial grooves, and the multiple radial grooves on the two end covers are staggered along the circumference of the end covers; two groups of radial channels are provided on the rotating shaft along its axial direction, and the multiple radial grooves on the two end covers are respectively arranged in one-to-one correspondence and connected with the multiple radial channels of the two groups of radial channels.

[0014] In some embodiments, a magnetic steel slot is provided on the rotor punching, and a plurality of the fan ring holes are provided between the magnetic steel slot and the center hole along the radial direction of the rotor punching.

[0015] In some embodiments, the plurality of sector ring holes and the plurality of magnetic steel slots are staggered along the circumferential direction of the rotor punching.

[0016] The utility model also provides an electric motor, comprising the rotor assembly provided by the utility model.

[0017] Beneficial effects of the utility model:

[0018] The rotor assembly provided by the present invention provides fan ring holes on the rotor punchings, so that the corresponding fan ring holes on the stacked multiple rotor punchings can be connected to form a medium channel. After the cooling medium is introduced into the medium channel, when the rotor rotates at high speed, the cooling medium can fully contact the outer arc of the fan ring hole under the action of centripetal force. Compared with the circular hole-shaped medium channel in the prior art, the fan ring hole-shaped medium channel of the present invention increases the contact area between the cooling medium and the medium channel, improves the effective cooling and heat exchange area, and is conducive to improving the cooling effect of the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an axial cross-sectional view of a rotor assembly provided by an embodiment of the present utility model;

[0020] Figure 2 This is a schematic structural diagram of a rotor punching in a rotor assembly provided by an embodiment of the present utility model;

[0021] Figure 3 This is a schematic structural diagram of a rotor assembly provided by an embodiment of the present invention in which multiple rotor punchings are staggered;

[0022] Figure 4 This is a perspective view of the staggered arrangement structure of two rotor punchings in the rotor assembly provided by an embodiment of the utility model;

[0023] Figure 5 It is a perspective view of the communication structure between the rotating shaft and the rotor punching in the rotor assembly provided by an embodiment of the present utility model.

[0024] In the picture:

[0025] 1. Rotor punching; 11. Sector ring hole; 12. Center hole; 13. Medium channel; 14. Large circle; 15. Small circle; 16. Magnetic steel slot;

[0026] 2. Rotating shaft; 21. Axial channel; 22. Radial channel;

[0027] 3. End cover; 31. Radial groove. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0029] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0032] The present invention provides a rotor assembly, such as Figure 1-Figure 5 The rotor assembly includes a plurality of rotor punchings 1, which are stacked; each rotor punching 1 is provided with a plurality of fan ring holes 11, and the outer arc of each fan ring hole 11 is located in a large circle 14 that is concentric with the center hole 12 of the rotor punching 1. Along the axial direction of the rotor punching 1, the corresponding plurality of fan ring holes 1111 are connected to form a plurality of medium channels 13, and the cooling medium is passed into the medium channels 13.

[0033] The rotor assembly provided by the utility model is as follows Figure 2 , a fan ring hole 11 is provided on the rotor punching 1, so that the fan ring holes 11 correspondingly provided on the stacked rotor punchings 1 can be connected to form a medium channel 13, such as Figure 3 After the cooling medium is introduced into the medium channel 13, when the rotor rotates at high speed, the cooling medium can fully contact the outer arc of the fan ring hole 11 under the action of centripetal force. Compared with the circular hole-shaped medium channel 13 in the prior art, the fan-shaped medium channel 13 of the utility model increases the contact area between the cooling medium and the medium channel 13, increases the effective cooling and heat exchange area, and is beneficial to improving the cooling effect of the rotor assembly.

[0034] In the comparative test of the circular hole and the fan ring hole 11, the circular hole and the fan ring hole 11 are set to have the same inner wall surface area, and equal amounts of cooling medium are respectively introduced into the medium channel 13 formed by the circular hole and the medium channel 13 formed by the fan ring hole 11. In the rotating state, the maximum centripetal force of the cooling medium has a smaller arc surface area on the inner wall surface of the medium channel 13 formed by the circular hole, while the inner wall surface of the medium channel 13 formed by the fan ring hole 11 has a larger arc surface area covering the outer arc inner wall surface of the entire fan ring hole 11, that is, the heat exchange area of ​​the cooling medium is large, and the average convection heat transfer coefficient of the medium channel 13 formed by the fan ring hole 11 is at least 1.7 times the average convection heat transfer coefficient of the medium channel 13 formed by the circular hole.

[0035] In some embodiments, the plurality of sector ring holes 11 are evenly spaced around the central hole 12 , and the outer arcs of the plurality of sector ring holes 11 are located on the same great circle 14 .

[0036] like Figure 2 The multiple fan ring holes 11 are evenly spaced, and the outer arcs of the multiple fan ring holes 11 are located on the same large circle 14, which can reduce the influence of the inertial force of the cooling medium on the rotation of the rotor and ensure the stable operation of the rotor. Since the cooling medium generates centripetal force when the rotor rotates, the distribution of the cooling medium in the medium channel 13 may change under the action of the centripetal force. Therefore, setting the same outer arc of the fan ring hole 11 is conducive to the cooling effect of the cooling medium on the rotor to be uniform and consistent, avoiding the influence of temperature differences caused by local cooling on the rotor performance.

[0037] In some embodiments, the inner arcs of the plurality of sector ring holes 11 are located on the same small circle 15 , and the large circle 14 and the small circle 15 are both concentrically arranged with the central hole 12 .

[0038] For example Figure 2 , multiple fan ring holes 11 are evenly distributed in the annular area between the large circle 14 and the small circle 15. The large circle 14, the small circle 15 and the center hole 12 are respectively located on three concentric circles, which is convenient for punching and forming, and is conducive to controlling multiple fan ring holes 11 to have the same structure and size, providing a uniform cooling effect.

[0039] In some embodiments, along the axial direction of the rotor punching 1 , a plurality of corresponding sector ring holes 11 on a plurality of rotor punchings 1 are staggered and connected along the circumferential direction.

[0040] like Figure 3 and Figure 4As shown, when stacked, multiple rotor punchings 1 are rotated in sequence around the axial direction at a fixed central angle to form a staggered rotor punching group. The size of the fixed central angle is related to the number of stacked rotor punchings 1 and the cooling effect. It can be understood that when the cooling medium flows in the medium channel 13, some structures of the staggered rotor punchings 1 will directly collide with the cooling medium, increasing the turbulence of the cooling medium and improving the cooling effect. The staggered rotor punchings 1 can increase the length of the medium channel 13, making the length of the medium channel 13 greater than the axial length of the stacked rotor punchings 1, thereby improving the cooling effect. Preferably, the cooling medium is a liquid, such as oil.

[0041] In some embodiments, the corresponding sector ring holes 11 on two adjacent rotor punchings 1 are staggered in a clockwise direction, and / or the corresponding sector ring holes 11 on two adjacent rotor punchings 1 are staggered in a counterclockwise direction.

[0042] like Figure 4 As shown, for example, two adjacent rotor punchings 1 are rotated in sequence at a fixed central angle so that the fan ring holes 11 are staggered. After staggering multiple rotor punchings 1 in sequence clockwise, they begin to stagger counterclockwise. Similarly, according to the number of rotor punchings 1, clockwise and counterclockwise staggering can be alternately arranged to form an S-shaped curve medium channel 13, thereby increasing the flow distance of the cooling medium in the medium channel 13 and improving the cooling effect. Figure 3 The rotor punchings 1 of the bottom layer are rotated clockwise by a certain angle relative to the rotor punchings 1 of the upper layer to form a staggered arrangement structure; Figure 4 The rotor punchings 1 of the bottom layer are rotated counterclockwise by a certain angle relative to the rotor punchings 1 of the upper layer to form a staggered arrangement structure.

[0043] In some embodiments, the rotor assembly further includes a rotating shaft 2 and an end cover 3, the center holes 12 of the plurality of rotor punchings 1 are all penetrated on the rotating shaft 2, the rotating shaft 2 is provided with an axial channel 21 and a plurality of radial channels 22 connected to the axial channel 21; the end cover 3 is provided at the end of the rotor punching 1 and fixes the rotor punching 1 on the rotating shaft 2, the end cover 3 is provided with a plurality of radial grooves 31, and the two ends of the plurality of radial grooves 31 are respectively connected to the plurality of radial channels 22 and the plurality of medium channels 13 in a one-to-one correspondence.

[0044] like Figure 1As shown, the center of the rotating shaft 2 is penetrated to form an axial channel 21. One end of the axial channel 21 serves as the cooling medium inlet. After entering the axial channel 21, the cooling medium flows outward through multiple radial channels 22 into multiple radial slots 31 on the end cover 3, and then enters the medium channel 13 through the radial slots 31. The cooling medium in the medium channel 13 can fill the entire cross-section of the medium channel 13 to achieve maximum flow, or it can contact part of the inner wall of the medium channel 13 to achieve a lower flow rate than the maximum flow. When the rotor rotates, the cooling medium, under the action of centripetal force, abuts against the inner wall of the medium channel 13 formed by the outer arc of the sector ring hole 11, performing heat exchange cooling, thus providing the primary cooling function. It can be understood that the end cover 3 serves to secure the rotor punching 1, particularly for axial positioning and fixation. At the same time, the cooling medium flows through the multiple radial slots 31 on the end cover 3, thus providing heat dissipation.

[0045] In some embodiments, two end covers 3 are provided, and the two end covers 3 are respectively provided at both ends of multiple rotor punchings 1. The two end covers 3 are respectively provided with multiple radial grooves 31, and the multiple radial grooves 31 on the two end covers 3 are staggered along the circumferential direction of the end covers 3; two groups of radial channels 22 are provided on the rotating shaft 2 along its axial direction, and the multiple radial grooves 31 on the two end covers 3 are respectively provided in a one-to-one correspondence with and connected to the multiple radial channels 22 of the two groups of radial channels 22.

[0046] In some embodiments, a magnetic steel slot 16 is provided on the rotor punching 1 , and a plurality of sector ring holes 11 are provided between the magnetic steel slot 16 and the center hole 12 along the radial direction of the rotor punching 1 .

[0047] In some embodiments, the plurality of sector ring holes 11 and the plurality of magnetic steel slots 16 are staggered along the circumferential direction of the rotor punching 1 .

[0048] like Figure 2 As shown, several fan ring holes 11 are set in the annular area between the magnetic steel slot 16 and the center hole 12. In the prior art, this area is generally set as a weight-reducing hole. On this basis, this embodiment can directly utilize the weight-reducing hole and set the weight-reducing hole in the form of a fan ring hole 11 to form a plurality of medium channels 13, and the cooling medium (oil) is passed through the plurality of medium channels 13 to achieve cooling of the middle position of the rotor punching 1. It should be noted that, with the fan ring hole 11 provided in this embodiment, since the cooling medium has a larger heat exchange contact area with the medium channel 13 at the inner wall of the outer arc, and the cooling medium does not have to be fully filled in the medium channel 13 (the flow rate of the cooling medium is less than the maximum flow rate), the fan ring hole 11 still has a weight-reducing effect.

[0049] The utility model also provides an electric motor, comprising the rotor assembly provided by the utility model.

[0050] The provision of the fan ring holes 11 on the rotor punchings 1 in the rotor assembly improves the cooling effect of the rotor assembly and simultaneously has the effect of reducing weight, thereby improving the performance of the motor.

[0051] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A rotor assembly, characterized in that: The invention comprises a plurality of rotor punchings (1), wherein the plurality of rotor punchings (1) are stacked; each of the rotor punchings (1) is provided with a plurality of fan ring holes (11); a large circle (14) where the outer arc of each fan ring hole (11) is located is concentrically arranged with a central hole (12) of the rotor punching (1); and along the axial direction of the rotor punching (1), the plurality of corresponding fan ring holes (11) are connected to form a plurality of medium channels (13), and a cooling medium is passed through the medium channels (13).

2. The rotor assembly according to claim 1, wherein: The plurality of fan ring holes (11) are evenly spaced around the central hole (12), and the outer arcs of the plurality of fan ring holes (11) are located on the same large circle (14).

3. The rotor assembly according to claim 2, wherein: The inner arcs of the plurality of fan ring holes (11) are located on the same small circle (15), and the large circle (14) and the small circle (15) are both arranged concentrically with the central hole (12).

4. The rotor assembly according to claim 1, wherein: Along the axial direction of the rotor punching sheet (1), the plurality of correspondingly arranged fan ring holes (11) on the plurality of rotor punching sheets (1) are staggered and connected along the circumferential direction.

5. The rotor assembly according to claim 4, wherein: The corresponding sector ring holes (11) on two adjacent rotor punching sheets (1) are staggered in a clockwise direction, and / or the corresponding sector ring holes (11) on two adjacent rotor punching sheets (1) are staggered in a counterclockwise direction.

6. The rotor assembly according to claim 1, wherein: The rotor assembly further comprises: A rotating shaft (2), wherein the central holes (12) of the plurality of rotor punchings (1) are all provided on the rotating shaft (2), and the rotating shaft (2) is provided with an axial channel (21) and a plurality of radial channels (22) communicating with the axial channel (21); An end cover (3) is provided at the end of the rotor punching (1) and fixes the rotor punching (1) to the rotating shaft (2). The end cover (3) is provided with a plurality of radial grooves (31), and the two ends of the plurality of radial grooves (31) are respectively connected to the plurality of radial channels (22) and the plurality of medium channels (13) in a one-to-one correspondence.

7. The rotor assembly according to claim 6, wherein: Two end covers (3) are provided, and the two end covers (3) are respectively provided at both ends of the plurality of rotor punchings (1). The two end covers (3) are respectively provided with a plurality of radial grooves (31), and the plurality of radial grooves (31) on the two end covers (3) are staggered along the circumferential direction of the end covers (3); two groups of radial channels (22) are provided on the rotating shaft (2) along its axial direction, and the plurality of radial grooves (31) on the two end covers (3) are respectively provided in one-to-one correspondence with and communicated with the plurality of radial channels (22) of the two groups of radial channels (22).

8. The rotor assembly according to claim 1, wherein: The rotor punching sheet (1) is provided with a magnetic steel slot (16), and a plurality of the sector ring holes (11) are provided between the magnetic steel slot (16) and the center hole (12) along the radial direction of the rotor punching sheet (1).

9. The rotor assembly according to claim 8, wherein: The plurality of sector ring holes (11) and the plurality of magnetic steel slots (16) are staggered along the circumferential direction of the rotor punching sheet (1).

10. An electric motor, characterized in that The rotor assembly comprises the rotor assembly according to any one of claims 1 to 9.

Images