Rotor and motor

Abstract

The invention provides a rotor and a motor, and relates to the technical field of motor heat dissipation, and the rotor comprises a rotor shaft which is provided with a shaft extension end and a non-shaft extension end which are oppositely arranged; the rotor iron core is sleeved on the rotor shaft, and the rotor iron core is provided with a first air hole which penetrates through two ends of the rotor iron core along the axial direction of the rotor iron core; a plurality of first fins and a plurality of second fins, the plurality of first fins are arranged at one end, close to the shaft extension end, of the rotor core at intervals along the circumferential direction of the rotor shaft, and the plurality of second fins are arranged at the other end, close to the non-shaft extension end, of the rotor core at intervals along the circumferential direction of the rotor shaft; the rotating directions of the first fins and the second fins are opposite; the rotor shaft is rotatably arranged, so that the plurality of first fins rotate and suck air flow into the first air holes, and the air flow passing through the first air holes flows in the direction far away from the rotor shaft under the rotation of the plurality of second fins. The brushless direct-current plastic package motor solves the problem that an existing brushless direct-current plastic package motor is poor in heat dissipation, heat dissipation can be conducted only through heat conduction, and the heat dissipation efficiency is not high.

Description

Technical Field

[0001] This invention relates to the field of motor heat dissipation technology, and more specifically, to a rotor and a motor. Background Technology

[0002] In the current home appliance manufacturing field, especially in applications involving brushless DC encapsulated motors, heat dissipation is one of the key factors restricting their performance and lifespan. Traditional brushless DC encapsulated motors, due to their sealed encapsulated structure, primarily rely on heat radiation to dissipate heat to the outside through the stator assembly and end caps. This heat dissipation method has significant limitations. Specifically, during operation, the limited internal space of the encapsulated motor hinders effective airflow, leading to heat accumulation. This, in turn, causes instability in the motor control board, reduces motor efficiency and reliability, and may even shorten its lifespan.

[0003] Furthermore, heat inside the motor is dissipated to the encapsulation material and metal components through heat conduction. This heat dissipation efficiency is low, especially under high loads or prolonged operation, where the motor temperature can easily rise rapidly, exceeding the safety threshold. Electronic components on the motor control board operating in high-temperature environments are not only prone to damage but also suffer from reduced control accuracy and response speed, negatively impacting the performance of the entire motor system. Summary of the Invention

[0004] The main objective of this invention is to provide a rotor and a motor to solve the technical problem in the prior art where excessively high motor temperature affects the normal operation of the motor.

[0005] To achieve the above objectives, according to one aspect of the present invention, a rotor is provided, comprising:

[0006] The rotor shaft has an extended end and a non-extended end that are arranged opposite to each other.

[0007] The rotor core is sleeved on the rotor shaft, and the rotor core has a first air hole that runs through both ends of the rotor core along the axial direction of the rotor core.

[0008] Multiple first fins and multiple second fins are arranged circumferentially along the rotor shaft at one end of the rotor core near the shaft extension end, and multiple second fins are arranged circumferentially along the rotor shaft at the other end of the rotor core near the non-shaft extension end; the first fins and the second fins have opposite rotation directions.

[0009] The rotor shaft is rotatably configured to cause multiple first fins to rotate and draw airflow into the first air hole, and to cause the airflow through the first air hole to flow away from the rotor shaft as multiple second fins rotate.

[0010] In some embodiments, the rotor further includes:

[0011] A baffle plate is installed on the end of the rotor core where the first fin is located. The baffle plate is positioned between the first air hole and the rotor shaft to block the airflow so that the airflow enters the first air hole.

[0012] The first air vent is located at one end of the first fin near the rotor shaft or at one end of the second fin near the rotor shaft.

[0013] The first air vent is provided in a one-to-one correspondence with the first fin or the second fin; or, the first air vent is provided in pairs on both sides of the first fin or the second fin.

[0014] The rotor core is provided with heat dissipation holes, wherein the heat dissipation holes are provided between two adjacent first fins; and / or, the heat dissipation holes are provided between two adjacent second fins.

[0015] In some embodiments, in the direction from the outer edge of the rotor core to the centerline of the rotor core;

[0016] The spacing between two adjacent first fins gradually decreases; and / or,

[0017] The spacing between two adjacent second fins gradually decreases.

[0018] Another aspect of the present invention provides an electric motor comprising the rotor described in any of the preceding claims.

[0019] In some embodiments, the motor further includes:

[0020] At least a portion of the stator assembly, rotor, and rotor shaft are installed in the stator assembly. A first end of the stator assembly is located near the shaft extension end. A second air hole is provided on the first end. The second air hole communicates with the first air hole. The first fin rotates to draw airflow into the second air hole and into the first air hole.

[0021] In some embodiments, a first mounting hole for mounting a rotor shaft is provided on the first end, and the first end further includes a first guide surface disposed near the rotor core. In the direction from the first mounting hole to the outer edge of the first end, the first guide surface extends in a direction away from the rotor core; and / or,

[0022] The end face of the first fin near the first end is the second guide surface. The second guide surface includes a proximal end near the rotor shaft and a distal end away from the rotor shaft. In the direction from the proximal end to the distal end, the second guide surface extends in the direction near the first end.

[0023] In some embodiments, the motor further includes:

[0024] An end cover is installed on one end of the stator assembly near the non-shaft extension end. The end cover has a third air hole for airflow to pass through, and the third air hole is connected to the first air hole.

[0025] In some embodiments, the motor further includes a motor controller disposed between the end cover and the rotor core;

[0026] The stator assembly between the motor controller and the rotor core has an arc-shaped transition structure on its side wall, which bends towards the rotor shaft; and / or,

[0027] The motor controller is equipped with a fourth air vent.

[0028] By applying the technical solution of this invention, this application designs a first fin and a second fin at both ends of the rotor core. The first fin and the second fin have different rotation directions. A first air hole extends through both ends of the rotor core. The first air hole is located at the end of the first fin or the second fin near the rotor shaft, and the first air holes are arranged in pairs on both sides of the first fin or the second fin. This optimizes the airflow path and improves the airflow efficiency. By increasing the number of fins and forming air ducts, this invention increases the contact area between the airflow and the internal components of the motor, thereby improving the heat exchange efficiency.

[0029] This invention solves the problem of poor heat dissipation in existing brushless DC encapsulated motors, which rely solely on heat conduction for cooling, resulting in low efficiency. This invention proposes a structure and heat dissipation method using stator and rotor end caps, addressing the issue of ineffective heat conduction and dissipation within existing DC encapsulated motors. Furthermore, the rotor with first and second fins utilizes an integrated injection-molded structure, simplifying the process and ensuring high reliability. This invention can replace existing motor structures without affecting the internal material dimensions of existing encapsulated motors. Airflow conduction effectively reduces the operating temperature of the motor's heating elements. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0031] Figure 1 A cross-sectional view of an embodiment of an electric motor according to the present invention is shown;

[0032] Figure 2 A schematic diagram of an end cover according to an embodiment of an electric motor according to the present invention is shown. Figure 1 ;

[0033] Figure 3 A schematic diagram of an end cover according to an embodiment of an electric motor according to the present invention is shown. Figure 2 ;

[0034] Figure 4 A schematic diagram of a stator assembly according to an embodiment of an electric motor is shown. Figure 1 ;

[0035] Figure 5 A schematic diagram of a stator assembly according to an embodiment of an electric motor is shown. Figure 2 ;

[0036] Figure 6 A schematic diagram of a rotor and rotor shaft according to an embodiment of an electric motor based on the present invention is shown;

[0037] Figure 7 A schematic diagram of the first fin of an embodiment of a rotor according to the present invention is shown;

[0038] Figure 8 A schematic diagram of an embodiment of a rotor according to the present invention is shown;

[0039] Figure 9 A schematic diagram of the second fin of an embodiment of a rotor according to the present invention is shown;

[0040] Figure 10 A schematic diagram of the airflow direction in the first duct of an embodiment of an electric motor according to the present invention is shown;

[0041] Figure 11 A schematic diagram of airflow direction according to an embodiment of an electric motor according to the present invention is shown;

[0042] Figure 12 A schematic diagram of the airflow direction in the second duct of an embodiment of an electric motor according to the present invention is shown;

[0043] Figure 13 A schematic diagram of airflow direction according to an embodiment of an electric motor according to the present invention is shown;

[0044] Figure 14 for Figure 13 A magnified view of a portion of the image.

[0045] The above figures include the following reference numerals:

[0046] 100. Stator assembly; 110. First end; 111. Second vent; 112. First mounting hole; 113. First guide surface; 120. Second end; 130. Arc structure; 140. First skirt; 200. Rotor; 210. Rotor core; 211. First vent; 212. Heat dissipation hole; 220. First fin; 221. First air duct; 222. Second guide surface; 230. Second fin; 231. Second air duct; 240. Baffle plate; 300. Rotor shaft; 400. End cover; 401. Third vent; 402. Second skirt; 403. Bearing chamber; 500. Motor controller; 600. Bearing; 700. Cyclone. Detailed Implementation

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0048] like Figure 7 , Figure 8 and Figure 9 As shown, a first embodiment of the present invention provides a rotor, the rotor 200 comprising:

[0049] Rotor shaft 300, having an extended shaft end A and a non-extended shaft end B disposed opposite to each other;

[0050] The rotor core 210 is sleeved on the rotor shaft 300, and the rotor core 210 has a first air hole 211 that passes through both ends of the rotor core 210 along the axial direction of the rotor core 210.

[0051] A plurality of first fins 220 and a plurality of second fins 230 are provided, wherein the plurality of first fins 220 are circumferentially spaced along the rotor shaft 300 at one end of the rotor core 210 near the shaft extension end A, and the plurality of second fins 230 are circumferentially spaced along the rotor shaft 300 at the other end of the rotor core 210 near the non-shaft extension end B; the first fins 220 and the second fins 230 have opposite directions of rotation;

[0052] The rotor shaft 300 is rotatably configured to allow the plurality of first fins 220 to rotate and draw airflow into the first air hole 211, and the airflow through the first air hole 211 to flow away from the rotor shaft 300 under the rotation of the plurality of second fins 230.

[0053] In this embodiment, the rotor core 210 is designed with a first end and a second end, wherein the first air hole 211 is arranged through both ends to enhance the heat dissipation effect by guiding airflow. A plurality of first fins 220 are circumferentially spaced along the rotor shaft 300 at one end of the rotor core 210 near the shaft extension end A, forming a first fan blade structure. A plurality of second fins 230 are circumferentially spaced along the rotor shaft 300 at the other end of the rotor core 210 near the non-shaft extension end B, forming a second fan blade structure. The opposite rotational direction design of the first and second fan blade structures ensures efficient airflow circulation within the motor. Airflow is drawn in from the shaft extension end A, guided through the first air hole 211 to the non-shaft extension end B, and after being blocked by the second fins 230, the airflow is thrown towards the outer edge of the rotor core 210 by the second fins 230, forming an effective heat dissipation path. This design utilizes the centrifugal force generated when the rotor rotates and the natural flow characteristics of the airflow. Through the guiding effect of the fins, the airflow circulates within the motor, thereby carrying away heat. The technology in this embodiment significantly improves the motor's heat dissipation capacity by optimizing the airflow path, reducing the motor's temperature during operation, thereby improving the motor's stability and efficiency. The number of the first fin 220 and the second fin 230 proposed in this invention is not limited and can be set according to the actual number of magnets and rotor poles of the rotor 200, facilitating one-time injection molding.

[0054] like Figure 10 , Figure 11 and Figure 12 As shown, assuming the shaft extension end A is viewed from the counterclockwise rotation direction, the rotor shaft 300 is installed and rotates counterclockwise. The first fin 220 is located at the first end, and the second fin 230 is located at the second end. The first fin 220 is a cutter, and the airflow will be cut by the first fin 220 around the circumference. Then the airflow flows towards the center. After the airflow passes through the first air hole 211, since the rotation directions of the first fin 220 and the second fin 230 are opposite, the airflow is thrown to the circumferential direction of the second end. This airflow path design can cover more of the rotor surface area and improve the heat dissipation efficiency of the rotor 200.

[0055] In other embodiments, the airflow guidance effect can be further optimized and the heat dissipation problem in different motor structures can be solved by adjusting the shape and number of the first fin 220 and the second fin 230, as well as the position and size of the first air hole 211.

[0056] Furthermore, such as Figure 9As shown, the rotor 200 further includes a baffle plate 240, which is disposed on the end of the rotor core 210 where the first fin 220 is located. The baffle plate 240 is positioned between the first air hole 211 and the rotor shaft 300 to block airflow and prevent airflow from entering the first air hole 211. Preferably, the baffle plate 240 is arranged around the rotor shaft 300.

[0057] In this embodiment, the baffle 240 further optimizes airflow guidance, ensuring that airflow can effectively enter the first air hole 211 without escaping directly. Utilizing its positional advantage, the baffle 240 blocks airflow from flowing directly to the rotor shaft 300, forcing the airflow through the first air hole 211. This increases the contact area between the airflow and the internal heat of the motor, improving heat dissipation efficiency. The technology in this embodiment, by adding the baffle 240, effectively avoids ineffective airflow dissipation, ensures precise airflow guidance, and further enhances the motor's heat dissipation effect.

[0058] In other embodiments, the shape and position of the baffle 240 can be adjusted according to actual needs, such as by adopting an arc or inclined design, to adapt to the airflow requirements of different motors and solve the heat dissipation problem in specific environments.

[0059] like Figure 8 As shown, a plurality of first fins 220 are circumferentially arranged around the rotor shaft 300, and a first air duct 221 is formed between adjacent first fins 220; airflow can enter the first air hole 211 along the first air duct 221; and / or,

[0060] Multiple second fins 230 are arranged circumferentially around the rotor shaft 300, and a second air duct 231 is formed between adjacent second fins 230. The airflow flows in a direction away from the rotor shaft 300 after passing through the first air duct 221, the first air hole 211 and the second air duct 231 in sequence.

[0061] In this embodiment, the arrangement of multiple first fins 220 and second fins 230 forms multiple first air ducts 221 and second air ducts 231, which not only increases the airflow path but also improves the airflow efficiency. By increasing the number of fins and forming air ducts, the contact area between the airflow and the internal components of the motor is increased, thereby improving heat exchange efficiency. The technology in this embodiment, through the arrangement of multiple fins and air ducts, significantly enhances the airflow guidance and heat dissipation effect, reducing the temperature rise of the motor. In other embodiments, the airflow guidance can be optimized and the heat dissipation problem in a specific motor structure can be solved by adjusting the shape of the fins and the structure of the air ducts, such as by adopting a tilt design at different angles.

[0062] Furthermore, the first air hole 211 is disposed at one end of the first fin 220 near the rotor shaft 300 or at one end of the second fin 230 near the rotor shaft 300.

[0063] This structural design allows airflow to flow from the outer edge of the rotor core 210 to the vicinity of the rotor shaft 300, resulting in a larger flow area and better heat dissipation efficiency. The first air vent 211 is positioned near one end of the fins close to the rotor shaft 300, which extends the airflow path and improves heat dissipation. The first fin 220 or the second fin 230 are arranged in pairs, aiming to ensure uniform airflow introduction and exit through the symmetrical distribution of the air vents, thereby optimizing airflow distribution.

[0064] Furthermore, the rotor core 210 is provided with heat dissipation holes 212, which are disposed between adjacent first fins 220 or adjacent second fins 230, and the first air holes 211 are arranged in pairs on both sides of the first fin 220 or the second fin 230.

[0065] This structural design ensures that airflow passes evenly through the first vent 211, thereby improving the uniformity and efficiency of heat dissipation. The paired structural design utilizes the symmetry of airflow; by optimizing the distribution of the first vent 211, it improves the uniformity of airflow and heat dissipation efficiency, reducing localized temperature rise in the motor. In other embodiments, the shape and size of the first vent 211 can be adjusted according to actual needs to adapt to the heat dissipation requirements of different motors and solve heat dissipation problems in specific environments.

[0066] Furthermore, such as Figure 6 and Figure 7 As shown, the rotor core 210 is provided with heat dissipation holes 212, which are disposed between adjacent first fins 220 or adjacent second fins 230.

[0067] This design allows airflow to pass through the heat dissipation holes 212, carrying away more heat and improving the heat dissipation effect of the rotor 200.

[0068] Furthermore, in the direction from the outer edge of the rotor core 210 to the center line of the rotor core 210, the spacing between two adjacent first fins 220 gradually decreases; and / or, the spacing between two adjacent second fins 230 gradually decreases.

[0069] This design ensures that airflow is more concentrated near the rotor center, improving heat dissipation efficiency. As the airflow approaches the rotor center, its speed and pressure change; reducing the spacing between the fins optimizes airflow distribution and enhances heat dissipation. The technology in this embodiment further improves the motor's heat dissipation capacity by optimizing the fin spacing, helping the motor maintain stable operation under high load conditions. In other embodiments, the fin spacing can be adjusted according to the actual operating conditions of the motor to achieve optimal heat dissipation.

[0070] The rotor provided by this invention features first fins 220 and second fins 230 at both ends of the rotor core 210. The first fins 220 and second fins 230 have different rotation directions. A first air hole 211 extends through both ends of the rotor core 210. The first air hole 211 is located at the end of the first fin 220 or the second fin 230 near the rotor shaft 300, and the first air holes 211 are arranged in pairs on both sides of the first fin 220 or the second fin 230. This optimizes the airflow path and improves airflow efficiency. By increasing the number of fins and forming air ducts, this invention increases the contact area between the airflow and the internal components of the motor, thereby improving heat exchange efficiency.

[0071] like Figure 1 As shown, a second embodiment of the present invention provides an electric motor including a rotor as described in any of the preceding embodiments.

[0072] This embodiment integrates the aforementioned rotor improvements to construct a highly efficient heat-dissipating motor system. By optimizing the rotor structure and guiding effective airflow circulation, the motor's heat dissipation performance is improved. The technology in this embodiment significantly improves the motor's heat dissipation efficiency, reduces the motor's operating temperature, and helps improve the motor's reliability and extend its service life.

[0073] Furthermore, such as Figure 5 As shown, the motor also includes a stator assembly 100, and at least a portion of the rotor 200 and the rotor shaft 300 are installed in the stator assembly 100. The first end 110 of the stator assembly 100 is located near the rotor core 210. A second air hole 111 is provided on the first end 110. The second air hole 111 communicates with the first air hole 211. The first fin 220 rotates to allow the second air hole 111 to draw in airflow to the first air hole 211.

[0074] In this embodiment, the coordinated design between the stator assembly 100 and the rotor 200 ensures that the airflow direction is radially from the circumference to the center and axially from the first end to the second end, allowing airflow to be introduced from outside the motor and effectively circulate through the air vents between the stator and rotor. In principle, the presence of the second air vent 111 provides an inlet for the airflow, and the second air vent 111 connects with the first air vent 211 to form a complete heat dissipation path. The technology in this embodiment, by optimizing the structure of the stator assembly 100 and the rotor 200, further improves the motor's heat dissipation capacity, helping the motor maintain stable operation under high load conditions.

[0075] Furthermore, such as Figure 4 As shown, the first end 110 has a first mounting hole 112 for mounting the rotor shaft 300. The first end 110 also includes a first guide surface 113 disposed near the rotor core 210. In the direction from the first mounting hole 112 to the outer edge of the first end 110, the first guide surface 113 extends away from the rotor core 210; and / or,

[0076] The end face of the first fin 220 near the first end 110 is a second guide surface 222. The second guide surface 222 includes a proximal end near the rotor shaft 300 and a distal end away from the rotor shaft 300. In the direction from the proximal end to the distal end, the second guide surface 222 extends in the direction close to the first end.

[0077] Preferably, the first guide surface 113 has a conical structure, which can guide airflow into the first air hole 211.

[0078] Specifically, the second guide surface 222 has a conical structure, which can guide airflow into the first air hole 211.

[0079] In this embodiment, the design of the first guide surface 113 optimizes the airflow introduction path and improves the airflow introduction efficiency. The tilt angle of the guide surface directly affects the airflow direction and velocity; a reasonable guide surface design can improve heat dissipation. The technology in this embodiment, by optimizing the first guide surface 113, further improves the motor's heat dissipation capacity, helping the motor maintain stable operation under high load conditions.

[0080] The design of the second guide surface 222 ensures that airflow can enter the rotor core 210 more smoothly from the first end, improving the airflow introduction efficiency. The angle and position of the second guide surface 222 directly affect the airflow direction and speed; an optimized design of the second guide surface 222 can improve heat dissipation. The technology in this embodiment, by optimizing the second guide surface 222, further improves the motor's heat dissipation capacity, helping the motor maintain stable operation under high load conditions.

[0081] Furthermore, such as Figure 2 and Figure 3 As shown, the motor also includes an end cover 400, which is installed on the stator assembly 100 near the non-shaft extension end. The end cover 400 has a third air hole 401 for airflow, and the third air hole 401 is connected to the first air hole 211.

[0082] In this embodiment, the design of the third vent 401 on the end cover 400 ensures that airflow can be effectively discharged from the inside of the motor, improving heat dissipation efficiency. The presence of the third vent 401 provides an outlet for airflow and forms a complete heat dissipation path with the first vent. In this embodiment, by optimizing the end cover structure, the heat dissipation capacity of the motor is further improved, which helps the motor maintain stable operation under high load conditions.

[0083] Furthermore, the motor also includes a motor controller 500, which is disposed between the end cover 400 and the rotor core 210; wherein, an arc-shaped transition structure 130 is provided on the side wall of the stator assembly 100 between the motor controller 500 and the rotor core 210, and the arc-shaped transition structure 130 is bent toward the rotor shaft 300; and / or, a fourth air hole is provided on the motor controller 500.

[0084] In this embodiment, the design of the arc-shaped transition structure 130 optimizes the airflow path between the motor controller and the rotor, improving heat dissipation efficiency. After passing through the rotor core 210 via the first air hole 211, the airflow is guided from the center to the circumference by centrifugal force and the second fin 230, and then further guided along the wall of the arc-shaped transition structure 130 towards the second end 120 of the stator assembly. The presence of the arc-shaped transition structure 130 alters the airflow direction, reduces airflow resistance, and improves heat dissipation. In this embodiment, by optimizing the airflow path between the stator assembly 100 and the rotor 200, the motor's heat dissipation capacity is further improved, helping the motor maintain stable operation under high load conditions. In other embodiments, the shape and position of the arc-shaped transition structure can be adjusted according to the actual operating conditions of the motor to achieve the best heat dissipation effect.

[0085] like Figure 13 and Figure 14 As shown, the airflow blows towards the motor controller 500, which may create an air vortex 700, increasing heat exchange with the components. The PCB board of the motor controller 500 has a certain number of fourth air holes, and some heat-generating elements are positioned facing the rotor 200. During the airflow's movement inside the motor, it is equivalent to providing air cooling for the rotor 200 and the motor controller 500, which can greatly improve the motor's heat dissipation capacity.

[0086] In this embodiment, the fourth vent on the motor controller 500 provides an additional outlet for airflow, optimizing airflow circulation within the motor. The presence of the fourth vent provides an outlet for airflow and, together with the first vent 211 and the third vent 401, forms a more complete heat dissipation path. By adding vents to the motor controller 500 in this embodiment, the motor's heat dissipation capacity is further improved, helping the motor maintain stable operation under high load conditions.

[0087] Furthermore, a bearing 600 is sleeved on the rotor shaft 300. The bearing 600 includes a first bearing and a second bearing. The first bearing is sleeved on the rotor shaft 300 and is located near the first end. The first bearing is installed in the first mounting hole 112 and provides support for the rotor shaft 300. The second bearing is sleeved on the rotor shaft 300 and is located near the second end. A bearing chamber 403 is provided on the end cover. The second bearing is installed in the bearing chamber and provides support for the rotor shaft 300.

[0088] The third air hole 401 and the second air hole 111 opened on the end cover 400 and the stator assembly 100 in this embodiment are not limited to circular holes. They can be set as oblong holes or other shaped holes to facilitate the processing of molds.

[0089] The shape of the motor controller 500 described in this embodiment is not limited; it can be L-shaped or round. Alternatively, the motor controller 500 may not be installed inside the motor. When the motor controller 500 is present, a corresponding fourth air vent can be provided.

[0090] The heat dissipation process of the rotor and motor of the present invention is as follows:

[0091] During motor operation, as the rotor 200 rotates, airflow enters the stator assembly 100 through the second air hole 111. The first fins 220 cut the airflow, causing it to flow radially towards the center of the rotor 200 and then be guided into the rotor core 210 through the first air hole 211. The airflow then enters the second air duct 231 and is thrown circumferentially, finally exiting the motor through the third air hole 401. Throughout this process, the airflow also passes through the fourth air hole on the motor controller 500, further enhancing the heat dissipation effect inside the motor. Furthermore, the synergistic effect of the baffle plate 240, the first guide surface 113, the second guide surface 222, and the arc-shaped transition structure 130 ensures smooth airflow and improves heat dissipation efficiency. The entire working process demonstrates the superiority and innovation of this embodiment's technical solution in improving motor heat dissipation performance.

[0092] In general, the airflow is drawn into the motor from the outside through the second air hole 111 of the stator assembly 100, and is guided by the first fin 220 to run towards the shaft. After being blocked by the radial baffle 240, it flows into the first air hole 211, then flows out of the second end and is thrown to the circumference along the second air duct 231. Then it flows towards the motor controller 500 along the arc transition structure 130, and blows towards the end cover 400 through the fourth air hole or the PCB-free area on the motor controller 500. Finally, it escapes through the third air hole 401 of the end cover 400.

[0093] The rotor 200 provided by this invention features first fins 220 and second fins 230 that can be injection molded simultaneously during plastic coating without affecting one-time molding and demolding. The third vent 401 of the end cap 400 is located within the area of ​​the second skirt 402, which can reduce the compressive stress during assembly, prevent the first skirt 140 of the stator assembly 100 from cracking, and is simple to process, also allowing for one-time stamping. The arc-shaped transition structure 130, first guide surface 113, second guide surface 222, and second vent 111 of the stator assembly 100 can all be achieved by adding or removing mold inserts, resulting in high process feasibility.

[0094] This invention solves the problem of poor heat dissipation in existing brushless DC encapsulated motors, which rely solely on heat conduction for cooling, resulting in low efficiency. This invention proposes a structure and heat dissipation method using stator and rotor end covers, addressing the issue of ineffective heat conduction and dissipation within existing DC encapsulated motors. Furthermore, the rotor 200 with the first fin 220 and second fin 230 utilizes an integrated injection molding structure, simplifying the process and ensuring high reliability. This invention can replace existing motor structures without affecting or interfering with the internal material dimensions of existing encapsulated motors. Airflow conduction effectively reduces the operating temperature of the motor's heating elements.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rotor, characterized in that, include: The rotor shaft (300) has an extended end and a non-extended end disposed opposite to each other; A rotor core (210) is sleeved on the rotor shaft (300), and the rotor core (210) has a first air hole (211) that extends through both ends of the rotor core (210) along the axial direction of the rotor core (210). A plurality of first fins (220) and a plurality of second fins (230) are provided, wherein the plurality of first fins (220) are circumferentially spaced along the rotor shaft (300) at one end of the rotor core (210) near the shaft extension end, and the plurality of second fins (230) are circumferentially spaced along the rotor shaft (300) at the other end of the rotor core (210) near the non-shaft extension end; the first fins (220) and the second fins (230) have opposite directions of rotation; The rotor shaft (300) is rotatably configured to cause the plurality of first fins (220) to rotate and draw airflow into the first air hole (211), and to cause the airflow through the first air hole (211) to flow away from the rotor shaft (300) under the rotation of the plurality of second fins (230).

2. The rotor according to claim 1, characterized in that, Also includes: A baffle plate (240) is disposed on the end of the rotor core (210) where the first fin (220) is located. The baffle plate (240) is disposed between the first air hole (211) and the rotor shaft (300) to block the airflow so that the airflow enters the first air hole (211).

3. The rotor according to claim 1, characterized in that, The first air hole (211) is located at one end of the first fin (220) near the rotor shaft (300) or at one end of the second fin (230) near the rotor shaft (300).

4. The rotor according to claim 1, characterized in that, The first air hole (211) is provided in a one-to-one correspondence with the first fin (220) or the second fin (230); or, the first air hole (211) is provided in pairs on both sides of the first fin (220) or the second fin (230).

5. The rotor according to claim 1, characterized in that, The rotor core (210) is provided with heat dissipation holes (212); Wherein, a heat dissipation hole (212) is provided between two adjacent first fins (220); and / or, The heat dissipation hole (212) is provided between two adjacent second fins (230).

6. The rotor according to claim 1, characterized in that, In the direction from the outer edge of the rotor core (210) to the center line of the rotor core (210); Wherein, the spacing between two adjacent first fins (220) gradually decreases; and / or, The spacing between two adjacent second fins (230) gradually decreases.

7. An electric motor, characterized in that, Includes the rotor as described in any one of claims 1-6.

8. The motor according to claim 7, characterized in that, Also includes: At least a portion of the stator assembly (100), rotor (200), and rotor shaft (300) are mounted in the stator assembly (100). A first end (110) of the stator assembly (100) is disposed near the shaft extension end. A second air hole (111) is provided on the first end (110). The second air hole (111) communicates with the first air hole (211). The first fin (220) rotates to draw airflow into the second air hole (111) and into the first air hole (211).

9. The motor according to claim 8, characterized in that, The first end (110) is provided with a first mounting hole (112) for mounting the rotor shaft (300), and the first end (110) also includes a first guide surface (113) disposed near the rotor core (210). In the direction from the first mounting hole (112) to the outer edge of the first end, the first guide surface (113) extends away from the rotor core (210); and / or, The end face of the first fin (220) near the first end (110) is a second guide surface (222). The second guide surface (222) includes a proximal end near the rotor shaft (300) and a distal end away from the rotor shaft (300). In the direction from the proximal end to the distal end, the second guide surface (222) extends in the direction near the first end.

10. The motor according to claim 8, characterized in that, The motor also includes: An end cap (400) is installed on one end of the stator assembly (100) near the non-shaft extension end. The end cap (400) has a third air hole (401) for airflow to flow out, and the third air hole (401) is connected to the first air hole (211).

11. The motor according to claim 10, characterized in that, The motor also includes a motor controller (500), which is disposed between the end cover (400) and the rotor core (210); Wherein, an arc-shaped transition structure (130) is provided on the side wall of the stator assembly (100) between the motor controller (500) and the rotor core (210), the arc-shaped transition structure (130) being bent toward the rotor shaft (300); and / or, The motor controller (500) is provided with a fourth air vent.

Images