Self-heat-dissipation hollow cup motor rotor and motor

Abstract

This application provides a self-heating hollow cup motor rotor and motor. The hollow cup motor rotor includes a winding coil assembly; multiple directional heat dissipation ribs evenly distributed on the outer wall of the winding coil assembly; an air guide space formed between adjacent directional heat dissipation ribs; and a commutator electrically connected to the winding coil assembly and disposed at one end of the hollow cup motor rotor. In the operating state of the hollow cup motor rotor, an airflow channel is formed within the air guide space to guide airflow to the commutator region. This hollow cup motor rotor has a self-heating function, which can reduce the temperature rise of the winding coil assembly and the commutator, thereby improving the motor's operating stability and service life.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a self-heating hollow cup motor rotor and motor. Background Technology

[0002] Coreless motors are widely used in precision drive and control systems due to their low moment of inertia and fast response speed. However, the rotor of a coreless motor generates a significant amount of heat during operation. Existing coreless motor rotor structures typically rely on the overall motor cooling system, which struggles to effectively dissipate heat from the rotor's interior and critical areas, leading to excessively high temperature rises. This is particularly problematic at high speeds, where localized rapid temperature increases in the rotor windings and commutator area can negatively impact the motor's operational stability and lifespan.

[0003] How to reduce the temperature rise of the rotor during operation and improve the temperature stability during operation within a limited structural space remains a technical problem that urgently needs attention in this field. Utility Model Content

[0004] To overcome the problems existing in the related technologies, this application provides a self-heating hollow cup motor rotor and motor.

[0005] According to a first aspect of the embodiments of this application, a self-heating hollow cup motor rotor is provided, the hollow cup motor rotor comprising:

[0006] Cup winding assembly;

[0007] The directional heat dissipation fins are multiple and are evenly distributed on the outer side wall of the cup winding assembly; wherein, an air guiding space is formed between adjacent directional heat dissipation fins.

[0008] A commutator is electrically connected to the winding coil and is disposed at one end of the rotor of the hollow cup motor.

[0009] In the working state of the hollow cup motor rotor, an airflow channel is formed in the air guide space to guide the airflow to the commutator area.

[0010] According to one embodiment of this disclosure, the directional heat dissipation ribs extend along a curved trajectory, and adjacent directional heat dissipation ribs have the same extension trajectory.

[0011] According to one embodiment of the present disclosure, the commutator includes a plurality of commutator segments evenly distributed along the circumferential direction of the hollow cup motor rotor;

[0012] Each of the commutator segments is electrically connected to a corresponding lead-out end of the winding coil assembly; the number of the directional heat dissipation fins is related to the number of the commutator segments.

[0013] According to one embodiment of this disclosure, the number of directional heat dissipation fins is the same as the number of commutator segments.

[0014] According to one embodiment of the present disclosure, the directional heat dissipation fin has a first side surface close to the winding coil assembly and a second side surface disposed opposite to the first side surface;

[0015] The distance between the first side and the second side is 0.01 to 0.0125 times the diameter of the cup winding group.

[0016] According to one embodiment of the present disclosure, the directional heat dissipation fin has a third side surface and a fourth side surface disposed opposite to the third side surface;

[0017] The planes containing the third and fourth sides are perpendicular to the plane containing the outer wall of the cup winding assembly.

[0018] According to one embodiment of the present disclosure, the cup winding assembly has a first end and a second end disposed along its axial direction;

[0019] The directional heat dissipation fin has a third end corresponding to the first end and a fourth end corresponding to the second end;

[0020] The distance between the third end and the fourth end is 3 to 5 times the distance between the first end and the second end.

[0021] According to a first aspect of the embodiments of this application, an electric motor is provided, the electric motor including the hollow cup motor rotor described above;

[0022] The motor housing has an inner cavity for accommodating the hollow cup motor rotor;

[0023] A stator core assembly, which is composed of multiple cores and is evenly arranged on the inner wall of the motor housing;

[0024] The hollow cup motor rotor is disposed in the inner cavity of the motor housing and is arranged opposite to the stator core assembly so that electromagnetic coupling is achieved through the electromagnetic field generated by the stator core assembly when the motor is running.

[0025] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0026] In this embodiment, by uniformly distributing directional heat dissipation ribs on the outer wall of the winding coil assembly, an airflow space is formed and an airflow channel is established when the rotor rotates, thereby effectively reducing the temperature rise of the winding coil assembly and the commutator. The number of directional heat dissipation ribs corresponds to the number of commutator segments, improving structural matching and heat dissipation balance. Their size, direction, and arrangement are limited to ensure a balance between heat dissipation efficiency and aerodynamic resistance. At the same time, the directional heat dissipation ribs do not increase the volume. While ensuring miniaturization, the life of the commutator and brushes is extended, and the stability and reliability of motor operation are improved.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments consistent with this application and, together with the application, serve to explain the principles of this application.

[0029] Figure 1 This is a schematic diagram of the overall structure of the self-heating hollow cup motor rotor in this application.

[0030] Figure 2 yes Figure 1 Enlarged view of part A.

[0031] Figure 3 yes Figure 1 Enlarged view of part B.

[0032] Figure 4 yes Figure 1 Enlarged view of part C.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Hollow cup motor rotor; 2. Winding coil; 21. First end; 22. Second end; 3. Directional cooling fins; 31. Air guide space; 32. First side; 33. Second side; 34. Third side; 35. Fourth side; 36. Third end; 37. Fourth end; 4. Commutator; 41. Commutator segment. Detailed Implementation

[0035] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments identical to those described in this application. Rather, they are merely examples of apparatuses and methods identical to some aspects of this application as detailed in the appended claims.

[0036] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0037] In existing technologies, hollow-cup motors tend to accumulate heat in the rotor during operation, leading to high temperature rises in the winding coils and commutator area, which affects the stable operation and service life of the motor. At the same time, due to the limitations of motor size and structural characteristics, existing rotors are insufficient in heat dissipation, making it difficult to effectively and promptly reduce the temperature of critical components. Therefore, how to improve the rotor structure to solve the problems of insufficient rotor heat dissipation and excessive temperature rise in critical components is a technical issue that urgently needs attention from those skilled in the art.

[0038] Based on this, this application discloses a self-heating hollow cup motor rotor and a motor, wherein the self-heating hollow cup motor rotor 1 and the motor using the hollow cup motor rotor 1 have the effect of self-heating.

[0039] The following is a detailed introduction to the self-heating hollow cup motor rotor 1:

[0040] In some embodiments of this disclosure, see Figure 1 The hollow cup motor rotor 1 includes: a cup winding wire group 2; multiple directional heat dissipation ribs 3, which are evenly distributed on the outer side wall of the cup winding wire group 2; wherein, an air guiding space 31 is formed between adjacent directional heat dissipation ribs 3; and a commutator 4, which is electrically connected to the cup winding wire group 2 and is disposed at one end of the hollow cup motor rotor 1; wherein, in the working state of the hollow cup motor rotor 1, an airflow channel is formed in the air guiding space 31 to guide the airflow to the commutator 4 area.

[0041] In this embodiment, when the hollow cup motor rotor 1 rotates, it rotates at high speed, causing multiple directional heat dissipation fins 3 on the outer wall of the winding coil 2 to rotate synchronously. Since the directional heat dissipation fins 3 are evenly distributed along the circumference, the airflow space 31 formed between adjacent directional heat dissipation fins 3 creates an airflow channel during the rotation of the hollow cup motor rotor 1, forcing the surrounding air or medium to flow along the airflow channel, thereby generating a guiding effect on the surface of the hollow cup motor rotor 1. This airflow is further guided to the area where the commutator 4 is located, effectively removing the heat generated by current commutation and brush friction. Through this process, the hollow cup motor rotor 1 can not only achieve active heat dissipation within its own structural range and reduce the temperature rise of the winding coil 2 and the commutator 4, but also improve the overall operational stability and service life of the motor without adding additional components.

[0042] Furthermore, the directional heat dissipation fins 3 are evenly arranged on the outer surface of the hollow cup motor rotor 1. When the hollow cup motor rotor 1 rotates, it can naturally drive the airflow, forming a basic air guiding effect, so that the airflow covers the winding and commutator 4 areas. This setting achieves auxiliary cooling of the heat-generating parts without changing the overall working mode and overall structure of the hollow cup motor rotor 1.

[0043] In some embodiments of this disclosure, see Figure 1 The directional heat dissipation fins 3 extend along a curved trajectory, and adjacent directional heat dissipation fins 3 extend along the same trajectory. This design makes the airflow more directional and the flow more stable when the coreless motor rotor 1 rotates, avoiding airflow turbulence, which helps to improve heat dissipation efficiency, and reduces additional wind resistance loss while ensuring the normal operation of the coreless motor rotor 1.

[0044] As an example, the directional cooling fins 3 can extend along a spiral curve trajectory, in which case the directional cooling fins 3 are spiral fins; adjacent spiral fins can form a spiral airflow channel. When the spiral fins are in the same direction of rotation as the hollow cup motor rotor 1, a propeller-like airflow effect can be generated, forming a continuous and stable axial airflow. The spiral channel allows the gas to flow along the rotor surface and be directionally transported to the commutator 4 area, thereby significantly improving the cooling effect in this area. The spiral arrangement can reduce local wind resistance fluctuations while ensuring heat dissipation, making the motor run more smoothly and with higher efficiency.

[0045] As another example, the directional heat dissipation fins 3 can extend along an arc-shaped curve trajectory, in which case the directional heat dissipation fins 3 are arc-shaped fins; an arc-shaped air guide channel is formed between adjacent arc-shaped fins. When the arc direction of the arc-shaped fins is consistent with the rotation direction of the hollow cup motor rotor 1, the airflow in the channel obtains a tangential component and adheres to the rotor surface under the action of centrifugal force, forming a continuous and stable axial-tangential composite airflow, which directionally delivers the gas to the commutator 4 area and forms organized sweeping and heat exchange in this area; the arc-shaped arrangement takes into account both air guidance and structural rigidity, which can reduce local vortex shedding and pressure pulsation while maintaining low manufacturing complexity, and improve cooling uniformity and operational stability.

[0046] As another example, the directional cooling fins 3 can extend along a wavy curve trajectory, in which case the directional cooling fins 3 are wavy fins; a periodically undulating corrugated airflow channel is formed between adjacent wavy fins. When the waveform propagation direction of the wavy fins is coordinated with the rotation direction of the hollow cup motor rotor 1, controlled secondary flow and micro-vortices are generated in the channel, which enhances the boundary layer disturbance and heat transfer coefficient without significantly increasing the average wind resistance, thereby achieving enhanced convective cooling of the commutator 4 region; the wavy arrangement can also provide a wider effective heat dissipation band and stronger resistance to local hot spots at different speeds, reduce temperature gradient and thermal stress, and thus improve motor efficiency and lifespan.

[0047] It is understood that the extension trajectory of the directional heat dissipation fin 3 is curved, and the curve can be spiral, arc-shaped, wavy, etc., and its shape is not limited to the above embodiment. Through different curve forms, a wind guiding effect can be formed when the rotor rotates, so as to achieve heat dissipation of the winding and commutator 4 area. Among them, the spiral shape can generate continuous axial airflow in the rotation direction of the hollow cup motor rotor 1, further improving the heat dissipation efficiency.

[0048] In some embodiments of this disclosure, the commutator 4 includes a plurality of commutator segments 41 evenly distributed along the circumference of the hollow cup motor rotor 1; wherein each commutator segment 41 is electrically connected to a corresponding lead-out end of the winding coil 2; the number of directional heat dissipation fins 3 is associated with the number of commutator segments 41. By associating the number of directional heat dissipation fins 3 with the number of commutator segments 41, the airflow distribution corresponds to the current commutation area; this avoids insufficient heat dissipation in certain areas of the commutator segments 41, thereby improving the overall cooling uniformity.

[0049] Furthermore, the commutator segment 41 is one of the areas where heat is concentrated (brush contact, commutation arc). Through the quantity correlation design, it can be ensured that there is airflow near each or several commutator segments 41, effectively reducing local temperature rise.

[0050] It is understood that the associations in this application have the following meanings: 1. One-to-one correspondence: In this arrangement, the number of directional cooling ribs 3 is the same as the number of commutator segments 41, and one directional cooling rib 3 is correspondingly set on the outer area of ​​each commutator segment 41. For example, when the motor rotor has 5 commutator segments 41, 5 directional cooling ribs 3 are correspondingly set on the outer wall of the winding coil assembly, ensuring that there is an independent airflow channel near each commutator segment 41. This arrangement can achieve a precise local cooling effect, so that the working area of ​​each commutator segment 41 can obtain stable airflow coverage, which is suitable for motor designs that require uniform heat dissipation and avoid local overheating. 2. One-to-many correspondence: In this arrangement, one directional cooling rib 3 can cover the area of ​​multiple commutator segments 41, thereby reducing the number of directional cooling ribs 3. For example, when the motor rotor has 10 commutator segments 41, only 5 directional cooling ribs 3 can be set, and each directional cooling rib 3 spans the area of ​​two adjacent commutator segments 41. This design reduces the number of heat dissipation fins required for processing and arrangement while maintaining good heat dissipation, thereby reducing structural complexity and manufacturing costs. It also creates a larger airflow channel, enhancing overall airflow guidance. 3. Variable Correspondence: In some special designs, the correspondence between the directional heat dissipation fins 3 and the commutator segments 41 can adopt a hybrid mode combining one-to-one and one-to-many arrangements. That is, heat dissipation fins are arranged one-to-one with commutator segments 41 in key areas for focused cooling, while other areas use a one-to-many arrangement to simplify the structure. This design can achieve differentiated heat dissipation strategies based on the heat distribution characteristics of the commutator segments 41, ensuring sufficient cooling of key components while simplifying the overall structure.

[0051] As an example, the number of directional cooling fins 3 is the same as the number of commutator segments 41. This arrangement ensures that each commutator segment 41 area corresponds to one directional cooling fin 3 and its airflow guide space 31, thereby forming a uniform and stable airflow distribution when the rotor rotates, avoiding heat dissipation dead zones. At the same time, this one-to-one correspondence arrangement does not require increasing the number of directional cooling fins 3, ensuring sufficient heat dissipation capacity while avoiding an increase in the external weight of the rotor due to excessive heat dissipation structures, thus reducing the moment of inertia and ensuring that the rotor can still operate efficiently and stably at high speeds.

[0052] In some embodiments of this disclosure, see Figure 2 The directional heat dissipation rib 3 has a first side 32 close to the cup winding wire group 2 and a second side 33 opposite to the first side 32; wherein the distance between the first side 32 and the second side 33 is 0.01 to 0.0125 times the diameter of the cup winding wire group 2.

[0053] For example, the distance between the first side 32 and the second side 33 can be 0.010 times the diameter of the cup winding group 2, or 0.0105 times, 0.0110 times, 0.0115 times, 0.0120 times, or 0.0125 times the diameter of the cup winding group 2. It should be noted that in other embodiments, the ratio of the distance between the first side 32 and the second side 33 to the diameter of the cup winding group 2 is not limited to this.

[0054] In this embodiment, by relating the distance between the first side 32 and the second side 33 to the diameter of the cup-shaped wire assembly 2, the directional heat dissipation fins 3 have sufficient exposed area / circumference to promote convective heat transfer without excessively increasing the windward area, thus reducing unnecessary wind resistance and noise. Simultaneously, the airflow space 31 formed by adjacent directional heat dissipation fins 3, at this thickness, more easily forms a continuous and predictable airflow channel, avoiding being too narrow (large pressure drop, tendency to blockage) or too wide (weak airflow, poor heat dissipation). Furthermore, a thickness on the order of one-hundredth of the diameter contributes relatively little mass, which is beneficial for maintaining low rotational inertia and dynamic balance margin, supporting high-speed stable operation.

[0055] It should be noted that, in this embodiment, limiting the thickness of the directional heat dissipation fin 3 to 0.01 to 0.0125 times the diameter of the online cup is based on the comprehensive optimization results of aerodynamic heat exchange, structure / process and lightweighting. This ensures the normal and efficient operation of the rotor, achieves effective heat dissipation without increasing volume and weight, and minimizes wind resistance loss of the rotor.

[0056] In some embodiments of this disclosure, see Figure 1 , Figure 2 as well as Figure 3 The directional heat dissipation rib 3 has a third side surface 34 and a fourth side surface 35 opposite to the third side surface 34; wherein the planes containing the third side surface 34 and the fourth side surface 35 are both perpendicular to the plane containing the outer wall of the cup coil assembly 2. In this embodiment, the directional heat dissipation rib 3 is provided with a third side surface 34 and a fourth side surface 35 opposite to each other, and the planes containing both are perpendicular to the plane containing the outer wall of the cup coil assembly 2. During rotor rotation, the airflow passing through the directional heat dissipation rib 3 is constrained by the third side surface 34 and the fourth side surface 35, and its flow direction is guided to a tangential direction close to the outer circle of the rotor. The resulting tangential airflow trajectory can enhance the sweeping speed of air on the rotor surface, increase the convective heat transfer efficiency, and at the same time avoid insufficient heat dissipation caused by the direct exhaust of airflow, thereby effectively improving the overall heat dissipation effect.

[0057] In some embodiments of this disclosure, see Figure 1 , Figure 2 , Figure 3 as well as Figure 4The cup-wound wire assembly 2 has a first end 21 and a second end 22 arranged along its axial direction; the directional heat dissipation rib 3 has a third end 36 corresponding to the first end 21 and a fourth end 37 corresponding to the second end 22; wherein the distance between the third end 36 and the fourth end 37 is 3 to 5 times the distance between the first end 21 and the second end 22. For example, the distance between the third end 36 and the fourth end 37 can be 3 times the distance between the first end 21 and the second end 22, 4 times the distance between the first end 21 and the second end 22, or 5 times the distance between the third end 36 and the fourth end 37. It should be noted that in other embodiments, the distance between the third end 36 and the fourth end 37 and the distance between the first end 21 and the second end 22 are not limited to these.

[0058] In this embodiment, the first end 21 of the winding coil 2 corresponds to the third end 36 of the directional cooling fin 3, meaning they are essentially flush in the axial position. This design ensures that the directional cooling fin 3 does not protrude or shorten at the winding end, thus avoiding the risk of rotor end interference with the stator or brushes, and ensuring that the cooling fin can still play a role in airflow and heat dissipation in the end area, thereby improving cooling performance without affecting the normal operation of the rotor.

[0059] Similarly, the second end 22 of the cup winding assembly 2 corresponds to the fourth end 37 of the directional heat dissipation fin 3, that is, the two are basically flush in axial position.

[0060] Furthermore, the distance between the third end 36 and the fourth end 37 is set to be 3 to 5 times the distance between the first end 21 and the second end 22. Firstly, this allows for a longer airflow path, extending the airflow along the directional cooling fins 3 a greater distance, resulting in a more effective airflow guide and enabling the airflow to cover key heat-generating points such as the commutator 4. Secondly, the distance between the third end 36 and the fourth end 37, being 3 to 5 times the distance between the first end 21 and the second end 22, helps to form a continuous flow channel, avoiding airflow interruption due to excessive length and additional resistance due to excessive length. Thirdly, this ratio balances heat dissipation effect and rotor mass; excessive length increases rotational inertia, while insufficient heat dissipation results in inadequate cooling.

[0061] Finally, it should be clarified that in this application, the distance between the third end 36 and the fourth end 37 is 3 to 5 times the distance between the first end 21 and the second end 22. This setting is not arbitrary, but rather a result of a comprehensive balance between thermal management and mechanical characteristics. Specifically, when the distance between the third end 36 and the fourth end 37 is less than 3 times the distance between the second end 22, the rotor's airflow space 31 will be insufficient, resulting in reduced heat dissipation capacity. When the distance between the third end 36 and the fourth end 37 is more than 5 times the distance between the second end 22, the improvement in heat dissipation is limited, but the weight and air resistance increase, which in turn affects efficiency. Therefore, the 3 to 5 times range is a reasonable design range after comprehensive consideration, ensuring good heat dissipation performance while guaranteeing efficient rotor operation.

[0062] The following is a detailed description of the motor using a self-heating hollow core motor rotor 1: The motor includes a hollow core motor rotor 1; a motor housing (not specifically shown in the accompanying drawings), having an inner cavity to accommodate the hollow core motor rotor 1; and a stator core assembly (not specifically shown in the accompanying drawings), which consists of multiple cores evenly arranged on the inner wall of the motor housing. The hollow core motor rotor 1 is disposed within the inner cavity of the motor housing and is arranged opposite to the stator core assembly, achieving electromagnetic coupling through the electromagnetic field generated by the stator core assembly during motor operation. This motor achieves efficient electromagnetic coupling through the rational configuration of the hollow core motor rotor 1 and the stator core assembly, exhibiting lightweight, low inertia, and fast response characteristics. During rotor rotation, airflow channels are formed by directional cooling fins 3, effectively reducing the temperature rise in the winding and commutator 4 areas, improving the motor's stability and service life. Simultaneously, the stator core assembly is evenly distributed on the inner wall of the motor housing, resulting in a compact structure that facilitates miniaturization design. This motor is not only suitable for precision equipment with high requirements for lightweighting and temperature rise control, such as drone gimbals, medical devices, and robot joints, but can also operate in oil or special media environments, demonstrating excellent reliability and applicability.

[0063] This application also provides a method for processing the directional heat dissipation fin 3, including the following processing method:

[0064] 1. Tooling preparation

[0065] Fabricate a tooling fixture whose inner cavity shape and size match the outer shape of the winding coil assembly 2, ensuring it can be tightly fitted around the outer circumference of the winding coil assembly 2. The tooling fixture should be made of a material that is resistant to high temperatures and pressure and has a certain degree of rigidity (such as metal or high-temperature resistant resin) to ensure stability during the subsequent thermosetting process.

[0066] Multiple longitudinal grooves are machined on the inner wall of the tooling. The size and number of each groove are consistent with the shape of the required directional heat dissipation fins 3, and they are evenly distributed along the circumference of the cup-shaped assembly 2.

[0067] 2. Installation of winding cable assembly 2

[0068] Place the cup winding yarn group 2 on the fixed station and ensure that the cup winding yarn group 2 is accurately positioned.

[0069] The fixture is fitted onto the outer periphery from one end of the winding cable group 2, and fixed to the winding cable group 2 by a buckle, positioning pin or clamping mechanism, so that it remains relatively stationary.

[0070] 3. Filling with potting compound

[0071] Choose a potting compound with good thermal conductivity and mechanical strength (such as epoxy resin-based thermally conductive adhesive), and perform degassing treatment in advance to remove internal air bubbles. Use dispensing equipment or manually to evenly apply the potting compound into the groove of the tooling, ensuring that the potting compound fills the entire groove.

[0072] The amount of adhesive should be controlled during the application process to avoid overflow and to ensure that the dimensions of the heat dissipation fins are consistent.

[0073] 4. Thermosetting treatment

[0074] Send the tooling along with the winding cable assembly 2 into the heating and curing device (such as an oven), and set the temperature and time according to the instructions for the colloid material (e.g., 120℃~150℃, for 30~60 minutes).

[0075] Maintain constant temperature and pressure during the thermosetting process to ensure that the potting compound cures evenly in the tank.

[0076] 5. Demolding and Inspection

[0077] After the thermosetting process is complete and the material has cooled naturally to room temperature, disassemble the fixing structure and gently remove the tooling. Check whether the directional heat dissipation ribs 3 formed by the potting compound are complete, whether their dimensions match the groove, and whether their surfaces are smooth and free of cracks.

[0078] 6. Formation and Function Confirmation of Directional Heat Dissipation Fins 3

[0079] Finally, multiple axially extending directional heat dissipation fins 3 are obtained on the outer wall of the cup winding assembly 2.

[0080] A uniform airflow space 31 is naturally formed between multiple directional heat dissipation fins 3.

[0081] After the rotor is assembled, a rotation test confirms that an effective airflow channel is formed in the air guide space 31 under working conditions, and the airflow is guided to the commutator 4 area to improve heat dissipation performance.

[0082] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A self-heating hollow cup motor rotor, characterized in that: The hollow cup motor rotor includes: Cup winding assembly; The directional heat dissipation fins are multiple and are evenly distributed on the outer side wall of the cup winding assembly; wherein, an air guiding space is formed between adjacent directional heat dissipation fins. A commutator is electrically connected to the winding coil and is disposed at one end of the rotor of the hollow cup motor. In the working state of the hollow cup motor rotor, an airflow channel is formed in the air guide space to guide the airflow to the commutator area.

2. The self-heating hollow cup motor rotor according to claim 1, characterized in that: The directional heat dissipation ribs extend along a curved trajectory, and adjacent directional heat dissipation ribs have the same extension trajectory.

3. The self-heating hollow cup motor rotor according to claim 1, characterized in that: The commutator includes a plurality of commutator segments evenly distributed along the circumferential direction of the hollow cup motor rotor; Each of the commutator segments is electrically connected to a corresponding lead-out end of the winding coil assembly; the number of the directional heat dissipation fins is related to the number of the commutator segments.

4. The self-heating hollow cup motor rotor according to claim 3, characterized in that: The number of directional heat dissipation fins is the same as the number of commutator segments.

5. The self-heating hollow cup motor rotor according to claim 1, characterized in that: The directional heat dissipation fin has a first side surface near the winding coil and a second side surface opposite to the first side surface; The distance between the first side and the second side is 0.01 to 0.0125 times the diameter of the cup winding group.

6. The self-heating hollow cup motor rotor according to claim 1, characterized in that: The directional heat dissipation fin has a third side and a fourth side disposed opposite to the third side; The planes containing the third and fourth sides are perpendicular to the plane containing the outer wall of the cup winding assembly.

7. The self-heating hollow cup motor rotor according to claim 1, characterized in that: The winding cable assembly has a first end and a second end disposed along its axial direction. The directional heat dissipation fin has a third end corresponding to the first end and a fourth end corresponding to the second end; The distance between the third end and the fourth end is 3 to 5 times the distance between the first end and the second end.

8. An electric motor, characterized in that, Includes a hollow cup motor rotor as described in any one of claims 1 to 7; The motor housing has an inner cavity for accommodating the hollow cup motor rotor; A stator core assembly, which is composed of multiple cores and is evenly arranged on the inner wall of the motor housing; The hollow cup motor rotor is disposed in the inner cavity of the motor housing and is arranged opposite to the stator core assembly so that electromagnetic coupling is achieved through the electromagnetic field generated by the stator core assembly when the motor is running.

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