Rotor assembly and electric machine

Abstract

The application relates to the technical field of motors, and discloses a rotor assembly and a motor, wherein the rotor assembly comprises a rotor, an end plate and a vane; the rotor comprises a rotor shaft and a rotor core; the rotor shaft is connected with the rotor core; the end plate is sleeved on the rotor shaft and connected with the rotor core; the end plate is provided with a clearance hole; the end plate and the rotor enclose a containing space which is communicated with the clearance hole; the vane passes through the clearance hole from the side of the end plate which is away from the rotor core; the vane is provided with a fixing part; the fixing part is arranged at the end of the vane which passes through the clearance hole; the fixing part is clamped between the rotor and the end plate and limited in the containing space. Through the locking cooperation between the end plate and the rotor core, the vane is fixed in the containing space, and the vane does not need to be connected with the rotor through welding or through a screw, so that the structure and the mounting process of the rotor fan are simplified, the structure is simple, the strength and the reliability are high, and the cost is low.

Description

Technical Field

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

[0002] In the structure of an electric motor, the rotor fan plays a role in driving the flow of cooling medium and improving heat dissipation inside the motor. The fan is generally connected to the end of the rotor by welding or bolting. Due to the high speed of the rotor rotation, the rotor fan on it also rotates at high speed. The rotor fan will be subjected to a combination of centrifugal force, fluid force, and vibration, resulting in a harsh stress environment.

[0003] In this situation, welding is not only costly, but also difficult to control the quality of the weld. Ordinary fusion welding may reduce the strength of the base material, and the connection between the fan and the rotor is prone to breakage when the rotor is rotating at high speed. Bolting, on the other hand, increases the material cost of bolts, is complicated to operate, and has a greater risk of bolt loosening or breakage. Summary of the Invention

[0004] The main objective of this invention is to provide a rotor assembly that improves the reliability of the rotor fan structure and reduces costs.

[0005] To achieve the above objectives, the rotor assembly provided by the present invention includes:

[0006] A rotor, the rotor comprising a rotor shaft and a rotor core, the rotor shaft being connected to the rotor core;

[0007] An end plate, which is sleeved on the rotor shaft and connected to the rotor core, has a clearance hole, and the end plate and the rotor core together form a receiving space communicating with the clearance hole; and

[0008] The blade passes through the clearance hole from the side of the end plate away from the rotor core. The blade is provided with a fixing part, which is located at the end of the blade that passes through the clearance hole. The fixing part is clamped between the rotor and the end plate and is confined within the receiving space.

[0009] In one embodiment of the present invention, the blade includes:

[0010] The fan blade portion is located on the side of the end plate opposite to the rotor core; and

[0011] A plug-in portion, which connects to the fan blade portion, passes through the clearance hole, and the end of the plug-in portion away from the fan blade portion is bent to form the fixing portion;

[0012] The fan blade and the connector are an integral structure.

[0013] In one embodiment of the present invention, the end plate is provided with a plurality of clearance holes, the plurality of clearance holes are evenly spaced along the circumference of the end plate, the rotor assembly includes a plurality of blades, one blade passes through one clearance hole, and one blade is provided with a fixing part.

[0014] In one embodiment of the present invention, the end plate has a receiving groove on the surface facing the rotor core, the receiving groove is connected to the clearance hole, and the rotor core blocks the opening of the receiving groove to form the receiving space.

[0015] In one embodiment of the present invention, the rotor core has a receiving groove on the surface facing the end plate, the receiving groove is disposed opposite to the clearance hole, and the end plate blocks the opening of the receiving groove to form the receiving space.

[0016] In one embodiment of the present invention, the end plate has a first receiving groove on the surface facing the rotor core, the first receiving groove is connected to the clearance hole, and the rotor core has a second receiving groove on the surface facing the end plate, the second receiving groove is disposed opposite to the first receiving groove and cooperates to form the receiving space.

[0017] In one embodiment of the present invention, the end plate is provided with a plurality of third receiving grooves circumferentially spaced on the surface of the rotor core facing the rotor core, the third receiving grooves are connected to the clearance hole, the rotor core blocks the opening of the third receiving groove to form a first receiving space, and the rotor core is provided with a plurality of fourth receiving grooves circumferentially spaced on the surface of the end plate facing the end plate, the end plate blocks the opening of the fourth receiving groove to form a second receiving space.

[0018] The plurality of blades are divided into a first blade and a second blade, wherein the fixing part of the first blade is disposed in the first accommodating space, and the fixing part of the second blade is disposed in the second accommodating space.

[0019] In one embodiment of the present invention, the first blade and the second blade are alternately arranged along the circumference of the end plate.

[0020] In one embodiment of the present invention, the end plate is provided with a mounting hole and a plurality of heat dissipation holes surrounding the mounting hole, and the wall of the mounting hole is threadedly connected to the rotor shaft.

[0021] The clearance hole is located on the outside of the heat dissipation hole.

[0022] The present invention also proposes an electric motor comprising a rotor assembly as described in any of the above embodiments.

[0023] The technical solution of this invention involves passing a blade with a fixing part through a clearance hole provided on the end plate, so that the fixing part is located between the rotor core and the end plate. Through the locking fit between the end plate and the rotor core, the blade is fixed in the receiving space. It is not necessary to connect the blade to the rotor by welding or screws, thus simplifying the structure and installation process of the rotor fan. The structure is simple, strong, reliable and low cost. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the rotor assembly of the present invention;

[0026] Figure 2 for Figure 1 A schematic diagram of the exploded structure of the central rotor assembly from another perspective;

[0027] Figure 3 This is a partial structural diagram of the end plate and blade in one embodiment of the present invention;

[0028] Figure 4 for Figure 3 A partial structural diagram of the mid-end plate and blade in another state;

[0029] Figure 5 This is a schematic diagram of another embodiment of the rotor assembly of the present invention;

[0030] Figure 6 for Figure 5 A partial structural schematic diagram of the central rotor assembly from another perspective;

[0031] Figure 7 This is a partial structural schematic diagram of another embodiment of the rotor assembly of the present invention;

[0032] Figure 8 This is a schematic diagram of another embodiment of the rotor assembly of the present invention;

[0033] Figure 9 for Figure 8 A partial structural schematic diagram of the rotor assembly from another perspective.

[0034] Explanation of icon numbers:

[0035] label name label name 100 Rotor assembly 30b Third receiving tank 10 Rotor 31 Mounting holes 11 rotor shaft 33 Heat dissipation holes 13 Rotor core 35 clearance hole 13a Second receiving tank 50 blade 13b Fourth container 51 fan blades 30 end plate 53 Connector 30a First receiving tank 55 Fixing part

[0036] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0039] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0040] In an electric motor structure, the rotor fan plays a crucial role in driving the flow of cooling medium and improving heat dissipation within the motor. As the rotor rotates at high speed with the rotor, it bears the combined effects of various loads, resulting in a harsh stress environment. In this situation, welding the rotor fan to the rotor body presents challenges in controlling weld quality, potentially leading to reduced base material strength. Bolting, on the other hand, increases the material cost of bolts, complicates the process, and carries a higher risk of bolt loosening or breakage.

[0041] In view of this, in order to improve the reliability of the rotor fan structure and reduce the cost, the present invention provides a rotor assembly 100.

[0042] Reference Figures 1 to 9In some embodiments, the rotor assembly 100 proposed in this application includes a rotor 10, an end plate 30, and blades 50. The rotor 10 includes a rotor shaft 11 and a rotor core 13, with the rotor shaft 11 connected to the rotor core 13. The end plate 30 is sleeved on the rotor shaft 11 and connected to the rotor core 13. The end plate 30 is provided with a clearance hole 35, and the end plate 30 and the rotor core 13 enclose a receiving space that communicates with the clearance hole 35. The blades 50 pass through the clearance hole 35 from the side of the end plate 30 away from the rotor core 13. The blades 50 are provided with a fixing part 55, which is located at the end of the blades 50 that passes through the clearance hole 35. The fixing part 55 is sandwiched between the rotor 10 and the end plate 30 and is confined within the receiving space.

[0043] In this embodiment, the rotor core 13 is generally cylindrical, the rotor shaft 11 passes through the central part of the rotor core 13, and the end plate 30 is sleeved on the rotor shaft 11. Optionally, the outer diameter of the end plate 30 is approximately the same as the outer diameter of the rotor core 13, and the end plate 30 can be connected to the rotor shaft 11 by means of fitting connection, threaded connection, etc.

[0044] Understandably, the blades 50 may include multiple blades 50 arranged around the rotor shaft 11, and the end plate 30 is provided with multiple clearance holes 35, which correspond one-to-one with the blades 50; or, the blades 50 may be a grid-like hollow integral structure, which has at least two fixing parts 55 to ensure the stability of the structure.

[0045] The shape of the clearance hole 35 is adapted to the shape of the blade 50. In this embodiment, the portion of the blade 50 inserted into the end plate 30 is a thin plate, and the clearance hole 35 is a narrow, elongated slot with a length slightly greater than the width of the portion of the blade 50 inserted into the end plate 30. In other embodiments of this application, the portion of the blade 50 inserted into the end plate 30 may be columnar, arc-shaped, or similar. Correspondingly, the clearance hole 35 is provided as a square, circular, or arc-shaped slot, which ensures that the blade 50 can pass through the end plate 30 while also positioning and constraining the blade 50.

[0046] The fixing part 55 is a solid structure located at the end of the blade 50 that passes through the clearance hole 35. Optionally, the fixing part 55 can be plate-shaped to allow the end plate 30 and the rotor core 13 to have a large contact area with the fixing part 55, ensuring a tight connection between the three and the stability of the blade 50. In other embodiments, the fixing part 55 can also be a three-dimensional structure such as a column partially embedded in the rotor core 13 and / or the end plate 30. Depending on the actual situation, the fixing part 55 and the body of the blade 50 can be integrally formed, or the fixing part 55 can be connected to the body of the blade 50 by bolts or other means, which is not limited here.

[0047] Optionally, the accommodating space can be an annular space surrounding the rotor shaft 11, or it can be a groove structure that corresponds one-to-one with the fixing part 55. The axial depth of the accommodating space is approximately equal to the thickness of the fixing part 55, so that the two opposing surfaces of the end plate 30 and the rotor core 13 fit tightly together, thereby improving the tightness of the connection and the structural stability.

[0048] The technical solution of the present invention fixes the blade 50 with the fixing part 55 by passing it through the clearance hole 35 provided on the end plate 30, so that the fixing part 55 is located between the rotor core 13 and the end plate 30. The blade 50 is fixed by the locking fit between the end plate 30 and the rotor core 13. It is not necessary to connect the blade 50 to the rotor 10 by welding or screws. This simplifies the structure and installation process of the rotor fan. The structure is simple, strong, reliable and low cost.

[0049] Reference Figures 1 to 4 In one embodiment of the present invention, the blade 50 includes a fan blade portion 51 and a plug portion 53. The fan blade portion 51 is located on the side of the end plate 30 away from the rotor core 13. The plug portion 53 is connected to the fan blade portion 51. The plug portion 53 passes through the clearance hole 35, and the end of the plug portion 53 away from the fan blade portion 51 is bent to form a fixing portion 55. The fan blade portion 51 and the plug portion 53 are integral structures.

[0050] Understandably, when the rotor 10 rotates, the blades 50 also rotate, and the fan blades 51 drive the airflow, continuously dissipating heat. Based on this, the shape of the fan blades 51 can be flat or curved, and the extension line of its upper side can pass through the center of the rotor shaft 11 or be set at a certain angle to the diameter of the end plate 30. That is to say, under the premise of ensuring good heat dissipation, the shape of the fan blades 51 is not restricted in much.

[0051] The width of the insertion portion 53 is smaller than that of the fan blade portion 51, so that when the insertion portion 53 extends into the clearance hole 35, the fan blade portion 51 is blocked by the end plate 30. Taking the insertion portion 53 as a flat plate as an example, its length is greater than the thickness of the end plate 30. During assembly, the insertion portion 53 is pre-inserted into the clearance hole 35, and then the portion of the insertion portion 53 protruding from the end plate 30 is laterally bent to form the fixing portion 55. After that, the end plate 30 can be engaged and locked with the rotor 10 to fix the blade 50.

[0052] The portion of the plug-in portion 53 protruding from the end plate 30 can be bent entirely to one side, or the plug-in portion 53 can be divided into two roughly identical parts, with the two parts bent in opposite directions, thus forming the fixing portions 55 located on both sides of the clearance hole 35.

[0053] Thus, the structure of the blade 50 is relatively simple, and it can be easily and quickly assembled with the rotor 10 and the end plate 30. The integrated blade 50 improves the overall structure and reliability.

[0054] Specifically, in one embodiment of the present invention, the end plate 30 is provided with a plurality of clearance holes 35, which are evenly spaced along the circumference of the end plate 30. The rotor assembly 100 includes a plurality of blades 50, each blade 50 passing through a clearance hole 35, and each blade 50 is provided with a fixing part 55, ensuring that the blades 50 and clearance holes 35 correspond one-to-one. It can be understood that the plurality of fixing parts 55 are clamped by the two opposing surfaces of the rotor core 13 and the end plate 30. In this way, the plurality of blades 50 can be easily assembled with the end plate 30 and the rotor 10, while also ensuring uniform and stable airflow.

[0055] Reference Figures 2 to 4 In one embodiment of the present invention, the end plate 30 is provided with a receiving groove on the surface facing the rotor core 13. The receiving groove is connected to the avoidance hole 35. The rotor core 13 blocks the opening of the receiving groove to form a receiving space. The fixing part 55 is provided in the receiving space.

[0056] The shape of the receiving groove is adapted to the shape of the fixing part 55. In this embodiment, the fixing part 55 is plate-shaped, formed by bending the portion of the insertion part 53 protruding from the end plate 30 to one side, and the receiving groove is approximately square. Optionally, the depth of the receiving groove is approximately equal to the thickness of the fixing part 55, so that the fixing part 55 is accommodated by the receiving space, and the surface of the fixing part 55 facing the rotor core 13 is flush with the surface of the end plate 30 facing the rotor core 13. In this way, the two opposing surfaces of the end plate 30 and the rotor core 13 can make more sufficient contact, the fit between the two is tighter, and the fixing part 55 can be limited by the receiving groove, making the blade 50 more stable.

[0057] Furthermore, the fixing part 55 may be provided with a number of limiting blocks in the circumferential direction, and the receiving groove may be provided with a number of limiting grooves in the circumferential direction. When the fixing part 55 extends into the receiving groove, the limiting blocks and limiting grooves are matched one-to-one to further restrict the movement of the fixing part 55 and further improve the stability of the blade 50.

[0058] Reference Figure 5 and Figure 6 In another embodiment of the present invention, the surface of the rotor core 13 facing the end plate 30 is provided with a receiving groove, which is disposed opposite to the clearance hole 35. The end plate 30 blocks the opening of the receiving groove to form a receiving space, and the fixing part 55 is disposed in the receiving space. The cooperation relationship between the receiving groove and the fixing part 55 can be referred to the previous embodiment. However, in this embodiment, on the one hand, the thickness of the end plate 30 is smaller than the thickness of the rotor core 13, and placing the receiving groove on the rotor core 13 can ensure the strength of the end plate 30 to a certain extent; on the other hand, this makes the fixing part 55 embedded in the rotor core 13, and the cooperation between the blade 50 and the rotor core 13 is tighter. The rotor core 13 can also directly drive the blade 50 to rotate through the fixing part 55, reducing the pressure on the end plate 30.

[0059] Reference Figure 5 and Figure 7 In another embodiment of the present invention, the surface of the end plate 30 facing the rotor core 13 is provided with a first receiving groove 30a, the first receiving groove 30a is connected to the avoidance hole 35, the surface of the rotor core 13 facing the end plate 30 is provided with a second receiving groove 13a, the second receiving groove 13a is arranged opposite to the first receiving groove 30a and cooperates to form a receiving space, and the fixing part 55 is provided in the receiving space.

[0060] The shape of the accommodating space is adapted to the shape of the fixing part 55. In this embodiment, the fixing part 55 is plate-shaped, and the openings of the first accommodating groove 30a and the second accommodating groove 13a are approximately square. When the end plate 30 is connected to the rotor 10, the first accommodating groove 30a and the second accommodating groove 13a together form an accommodating space adapted to the fixing part 55, so that the fixing part 55 is accommodated by the accommodating space. In this way, the two opposing surfaces of the end plate 30 and the rotor core 13 can make more sufficient contact, and the fixing part 55 is partially disposed in the first accommodating groove 30a and the other part is disposed in the second accommodating groove 13a. The cooperation between the fixing part 55, the rotor 10 and the end plate 30 is closer, making the blade 50 more stable and the structure more reliable.

[0061] Reference Figure 8 and Figure 9 In another embodiment of the present invention, the end plate 30 is provided with a plurality of third receiving grooves 30b spaced apart circumferentially on the surface of the rotor core 13. The third receiving grooves 30b are connected to the clearance holes 35. The rotor core 13 blocks the opening of the third receiving grooves 30b to form a first receiving space. The rotor core 13 is provided with a plurality of fourth receiving grooves 13b spaced apart circumferentially on the surface of the end plate 30. The end plate 13 blocks the opening of the fourth receiving grooves 13b to form a second receiving space. The plurality of blades 50 are divided into first blades 50 and second blades 50. The fixing part 55 of the first blade 50 is provided in the first receiving space, and the fixing part 55 of the second blade 50 is provided in the second receiving space.

[0062] In this embodiment, the first blade 50 and the second blade 50 have roughly the same structure. When the end plate 30 is connected to the rotor core 13, the first blade 50 is disposed in the third receiving groove 30b, and the second blade 50 is disposed in the fourth receiving groove 13b. Optionally, multiple third receiving grooves 30b are disposed on a semicircle surrounding the rotor shaft 11, and multiple fourth receiving grooves 13b are disposed on another semicircle. In this case, the first blade 50 is longer than the second blade 50 by about one thickness of the fixing part 55, so as to ensure that the end of the fan blade portion 51 facing away from the rotor core 13 is flush with the fan blade portion 51, and the air outlet is uniform.

[0063] In another embodiment of the present invention, the first blade 50 and the second blade 50 are alternately arranged along the circumference of the end plate 30. This allows for closer cooperation between the fixing part 55, the rotor 10, and the end plate 30. On the one hand, it ensures more uniform force distribution on the multiple blades 50 and the end plate 30 as a whole. On the other hand, when the length and height of the first blade 50 and the second blade 50 are the same, since the fixing parts 55 of the first blade 50 and the second blade 50 are respectively accommodated in the first accommodating space and the second accommodating space, and the bottom walls of the first accommodating space and the second accommodating space are not on the same plane in the axial direction, the portions of the first blade 50 and the second blade 50 located on the side of the end plate 30 away from the rotor core 13 are alternately arranged along the circumference of the end plate 30, resulting in more layered airflow and better heat dissipation.

[0064] Reference Figure 5 In one embodiment of the present invention, the end plate 30 is provided with a mounting hole 31 and a plurality of heat dissipation holes 33 surrounding the mounting hole 31. The hole wall of the mounting hole 31 is threadedly connected to the rotor shaft 11, which is convenient and reliable for installation. The clearance hole 35 is provided on the outside of the heat dissipation hole 33. In this embodiment, the heat dissipation hole 33 is generally circular. The heat generated by the rotor 10 can be dissipated from the heat dissipation hole 33 and escaped to the outside by the airflow generated by the rotation of the blade 50, thereby improving the heat dissipation efficiency.

[0065] Of course, in other embodiments, the end plate 30 can also be fitted and snapped into the rotor shaft 11; an installation space is formed between the blade 50, the end plate 30 and the rotor shaft 11 for the installation of bearings and other devices, resulting in high space utilization.

[0066] The present invention also proposes an electric motor, which includes a rotor assembly 100 as described in any of the above embodiments. The specific structure of the rotor assembly 100 is as described in the above embodiments. Since the present motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0067] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that, The rotor assembly includes: A rotor, the rotor comprising a rotor shaft and a rotor core, the rotor shaft being connected to the rotor core; An end plate, which is sleeved on the rotor shaft and connected to the rotor core, has a clearance hole, and the end plate and the rotor core together form a receiving space communicating with the clearance hole; and The blade passes through the clearance hole from the side of the end plate away from the rotor core. The blade is provided with a fixing part, which is located at the end of the blade that passes through the clearance hole. The fixing part is clamped between the rotor and the end plate and is confined within the receiving space. The end plate is provided with a plurality of clearance holes, which are evenly spaced along the circumference of the end plate. The rotor assembly includes a plurality of blades, one blade passing through one clearance hole and one blade being provided with a fixing part. The end plate has a receiving groove on its surface facing the rotor core. The receiving groove communicates with the clearance hole, and the rotor core blocks the opening of the receiving groove to form the receiving space; or The rotor core has a receiving groove on its surface facing the end plate. The receiving groove is positioned opposite to the clearance hole. The end plate seals the opening of the receiving groove to form the receiving space; or The end plate has a first receiving groove on the surface facing the rotor core, the first receiving groove is connected to the clearance hole, and the rotor core has a second receiving groove on the surface facing the end plate, the second receiving groove is arranged opposite to the first receiving groove and cooperates to form the receiving space.

2. The rotor assembly as claimed in claim 1, characterized in that, The blade includes: The fan blade portion is located on the side of the end plate opposite to the rotor core; and A plug-in portion, which connects to the fan blade portion, passes through the clearance hole, and the end of the plug-in portion away from the fan blade portion is bent to form the fixing portion; The fan blade and the connector are an integral structure.

3. The rotor assembly as claimed in claim 1, characterized in that, The end plate is provided with mounting holes and a plurality of heat dissipation holes surrounding the mounting holes, and the hole walls of the mounting holes are threadedly connected to the rotor shaft. The clearance hole is located on the outside of the heat dissipation hole.

4. A rotor assembly, characterized in that, The rotor assembly includes: A rotor, the rotor comprising a rotor shaft and a rotor core, the rotor shaft being connected to the rotor core; An end plate, which is sleeved on the rotor shaft and connected to the rotor core, has a clearance hole, and the end plate and the rotor core together form a receiving space communicating with the clearance hole; and The blade passes through the clearance hole from the side of the end plate away from the rotor core. The blade is provided with a fixing part, which is located at the end of the blade that passes through the clearance hole. The fixing part is clamped between the rotor and the end plate and is confined within the receiving space. The end plate is provided with a plurality of clearance holes, which are evenly spaced along the circumference of the end plate. The rotor assembly includes a plurality of blades, one blade passing through one clearance hole and one blade being provided with a fixing part. The end plate has a plurality of third receiving grooves spaced apart circumferentially on the surface of the rotor core facing the rotor core. The third receiving grooves are connected to the clearance holes. The rotor core blocks the opening of the third receiving groove to form a first receiving space. The rotor core has a plurality of fourth receiving grooves spaced apart circumferentially on the surface of the end plate facing the end plate. The end plate blocks the opening of the fourth receiving groove to form a second receiving space. The plurality of blades are divided into a first blade and a second blade, wherein the fixing part of the first blade is disposed in the first accommodating space, and the fixing part of the second blade is disposed in the second accommodating space.

5. The rotor assembly as claimed in claim 4, characterized in that, The first blade and the second blade are alternately arranged along the circumference of the end plate.

6. The rotor assembly as claimed in claim 4, characterized in that, The blade includes: The fan blade portion is located on the side of the end plate opposite to the rotor core; and A plug-in portion, which connects to the fan blade portion, passes through the clearance hole, and the end of the plug-in portion away from the fan blade portion is bent to form the fixing portion; The fan blade and the connector are an integral structure.

7. The rotor assembly as claimed in claim 4, characterized in that, The end plate is provided with mounting holes and a plurality of heat dissipation holes surrounding the mounting holes, and the hole walls of the mounting holes are threadedly connected to the rotor shaft. The clearance hole is located on the outside of the heat dissipation hole.

8. An electric motor, characterized in that, The motor includes a rotor assembly as described in any one of claims 1 to 7.

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