Rotor structure and motor

Abstract

The invention relates to the technical field of motors, particularly provides a rotor structure and a motor, and aims to solve the problem of poor heat dissipation effect of a rotor winding in an existing air cooling mode. In order to achieve the purpose, the rotor structure comprises a rotor magnetic pole and a rotor winding arranged on the rotor magnetic pole, and one end of the heat conduction structure is connected with the rotor winding, and the other end of the heat conduction structure extends out of the rotor winding so as to transfer heat of the rotor winding to the external environment. Through the arrangement of the heat conduction structure, heat can be transmitted to the external environment from the rotor winding, and the problems that the temperature distribution of the rotor winding is not uniform and local hot spots exist are solved, so that the heat dissipation performance of the rotor winding is optimized.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and specifically provides a rotor structure and a motor. Background Art

[0002] With the continuous progress of technology and the rapid development of industry, motors, as the core equipment for electric energy conversion, play a crucial role in the power system. However, with the increase in motor capacity and the improvement of rotational speed, the problem of motor rotor heating has gradually become prominent and has become a key factor restricting motor performance.

[0003] In related technologies, air cooling, as one of the common cooling methods for motor rotors, has advantages such as simple structure and convenient maintenance, and can meet the cooling requirements of motor rotors to a certain extent. However, with the development of generator sets towards large capacity and high speed, the existing air cooling method has been difficult to meet the heat dissipation requirements of rotor windings, especially in the leeward side of the rotor windings and the area near the shroud, and the heat dissipation problem is more prominent. More seriously, the uneven temperature distribution caused by insufficient heat dissipation will cause different degrees of thermal deformation in different parts of the rotor winding, thereby damaging the winding structure and affecting the electromagnetic performance of the motor. Such problems will not only reduce the reliability and stability of the generator set, but may also cause serious safety accidents, posing a huge hidden danger to the operation of the power system.

[0004] In view of this, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] The present application aims to solve the above technical problems, that is, to solve the problem of poor heat dissipation effect of the rotor winding under the existing air cooling method.

[0006] In a first aspect, the present application provides a rotor structure, including:

[0007] Rotor poles and rotor windings arranged on the rotor poles;

[0008] A heat conduction structure, one end of which is connected to the rotor winding and the other end extends out of the rotor winding to transfer the heat of the rotor winding to the external environment.

[0009] In the case of adopting the above technical solution, by setting the heat conduction structure, heat can be transferred from the rotor winding to the external environment, thereby reducing the temperature of the rotor winding.

[0010] Optionally, the heat conduction structure includes a first heat conduction structure, and the first heat conduction structure is a heat pipe.

[0011] In the case of adopting the above technical solution, the rotor winding is cooled based on the phase change cooling principle of the heat pipe, so that the heat in the rotor winding can be efficiently transferred from the evaporation end of the heat pipe to the condensation end, thereby realizing heat exchange and reducing the temperature of the rotor winding.

[0012] Optionally, the rotor structure further includes:

[0013] Radiating fins, which are arranged at one end of the first heat conducting structure away from the rotor winding.

[0014] In the case of adopting the above technical solution, the heat of the phase change working medium in the heat pipe at the condensation end can be efficiently conducted to the air through the radiating fins, thereby improving the heat dissipation performance.

[0015] Optionally, a plurality of the first heat conducting structures are arranged in an array on the outer peripheral wall of the rotor winding.

[0016] In the case of adopting the above technical solution, not only can the contact area between the first heat conducting structure and the rotor winding be increased, so as to quickly and fully absorb the heat generated at each part and avoid the accumulation of local heat. At the same time, multiple first heat conducting structures work in parallel, which can also improve the efficiency of heat conduction to the external environment.

[0017] Optionally, a channel is formed on the outer peripheral wall of the rotor winding, and one end of the first heat conducting structure is arranged in the channel.

[0018] In the case of adopting the above technical solution, the connection between the rotor winding and the first heat conducting structure is more stable and can form a tight contact, so that the heat generated by the rotor winding can be transferred to the first heat conducting structure faster, thereby improving the heat dissipation performance.

[0019] Optionally, the rotor structure further includes:

[0020] A fixing component, which is arranged outside the rotor winding. The fixing component fixes the rotor winding on the rotor core. The fixing component includes a fixing plate and an insulating member arranged on the inner surface of the fixing plate. A through hole is formed on the insulating member. The heat conducting structure further includes:

[0021] A second heat conducting structure, one end of which is connected to the rotor winding, and the other end passes through the through hole and is connected to the fixing plate.

[0022] In the case of adopting the above technical solution, the second heat conducting structure can pass through the through hole on the insulating member and be embedded into the blind hole of the fixing plate to be connected to the fixing plate with good heat conductivity, so that the heat generated by the rotor winding can be conducted to the outside through the fixing plate, enhancing the heat dissipation capacity of this area.

[0023] Optionally, the second heat conduction structure is a heat pipe, and the heat dissipation fins are arranged on the outer surface of the fixing plate.

[0024] In the case of adopting the above technical solution, the heat dissipation area can be effectively increased, the heat conduction from the fixing plate to the external environment can be accelerated, and the cooling efficiency can be further improved.

[0025] Optionally, the rotor winding includes multiple turns of coils, and an accommodating space is formed in the insulating layer between adjacent coils. The heat conduction structure further includes:

[0026] A third heat conduction structure, at least part of which is arranged in the accommodating space.

[0027] In the case of adopting the above technical solution, by setting the third heat conduction structure, the heat generated locally in the rotor winding can be evenly dispersed axially and circumferentially, avoiding the problem of excessive local temperature caused by heat concentration, thereby effectively improving the overall heat dissipation efficiency and thermal stability of the rotor winding.

[0028] Optionally, the third heat conduction structure is a VC heat pipe.

[0029] In the case of adopting the above technical solution, based on the phase change cooling principle of the VC heat pipe, the heat in the rotor winding can be continuously and evenly dispersed axially and circumferentially under the action of the VC heat pipe, avoiding the problem of excessive local temperature caused by heat concentration. At the same time, it can also cool the rotor winding, transfer the heat to the external environment through the VC heat pipe, and further reduce the temperature of the rotor winding.

[0030] In a second aspect, the present application provides a motor, including the rotor structure according to any one of the first aspects.

[0031] In the case of adopting the above technical solution, the motor provided by the present application can maintain an appropriate working temperature under high load, and thus can improve the stability and service life of the motor operation. Description of the Drawings

[0032] The following describes the preferred embodiments of the present application with reference to the drawings. In the drawings:

[0033] Figure 1 is one of the partial structure schematic diagrams of the rotor structure according to an embodiment of the present application;

[0034] Figure 2 is the assembly structure schematic diagram of the first heat conduction structure and the heat dissipation fins according to an embodiment of the present application;

[0035] Figure 3 is Figure 1 the enlarged partial structure schematic diagram of part A in

[0036] Figure 4 It is the second partial structural schematic diagram of the rotor structure according to an embodiment of the present application, aiming to show the structural schematic diagram of the rotor structure fixing component area;

[0037] Figure 5 is Figure 4 the exploded structural schematic diagram;

[0038] Figure 6 It is the third partial structural schematic diagram of the rotor structure according to an embodiment of the present application, aiming to show the assembly structural schematic diagram of the third heat conduction structure and the rotor winding;

[0039] Figure 7 It is the sectional structural schematic diagram of the VC heat pipe according to an embodiment of the present application. List of reference numerals:

[0040] 10 - Rotor core, 11 - Rotor winding, 110 - Insulating layer;

[0041] 21 - First heat conduction structure, 211 - First section, 212 - Second section, 213 - Heat dissipation fins, 22 - Second heat conduction structure, 231 - Fixing plate, 232 - Insulating part, 2320 - Through hole, 233 - Bolt, 24 - VC heat pipe, 241 - First part, 242 - Second part, 243 - Bottom plate, 244 - Frame, 245 - Support column, 246 - Notch. Detailed implementation manners

[0042] The preferred implementation manners of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present application and are not used to limit the protection scope of the present application. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0043] It should be noted that in the description of the present application, terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the relevant devices or components must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present application. In addition, ordinal numbers such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] Air cooling is a cooling method that uses air as a cooling medium to remove heat. Currently, air cooling is a relatively common cooling method for motor rotors. However, with the development of generator sets towards the goals of large capacity and high speed, the existing air cooling methods cannot meet the heat dissipation requirements of the rotor winding.

[0046] Due to insufficient heat dissipation efficiency, local heat accumulation or uneven temperature distribution is likely to occur in the rotor winding. For example, during the rotation of the rotor winding, the cooling air flow velocity near the rotor winding on the windward side is relatively high, and the convective heat transfer effect is obvious. The cooling air flow velocity near the rotor winding on the leeward side is relatively low, and the heat transfer performance is poor, resulting in untimely heat exchange on the leeward side and a significantly higher temperature than that on the windward side, thus forming a large temperature difference between the windward side and the leeward side of the rotor winding.

[0047] In addition, due to the uneven velocity distribution of the cooling air in the axial direction, in the area with a large flow velocity, the convective heat transfer effect is good, and the temperature of the rotor winding is relatively low. In the area with a slow flow velocity, the heat transfer performance is poor, and heat is easily accumulated. Therefore, there will also be temperature differences in the rotor windings at different axial positions.

[0048] Due to the uneven temperature distribution, problems such as thermal deformation of the rotor winding will be caused, threatening the safe and stable operation of the unit. Therefore, in this embodiment, a rotor structure is proposed to solve the above problems.

[0049] Specifically, referring to Figure 1 and 4 , which is a schematic diagram of a partial structure of a rotor structure according to an embodiment of the present application. The rotor structure includes a rotor pole and a rotor winding 11 provided on the rotor pole. A heat conduction structure is provided on the rotor winding 11. One end of the heat conduction structure is connected to the rotor winding 11, and the other end extends out of the rotor winding 11 to transfer the heat in the rotor winding 11 to the external environment.

[0050] In this embodiment, "one end of the heat-conducting structure is connected to the rotor winding 11" means that a connection relationship capable of realizing heat transfer is established between the heat-conducting structure and the rotor winding 11. There are various such connection methods. For example, the heat-conducting structure is directly in contact with the surface of the rotor winding 11, such as by means of close fitting, welding, riveting, etc. In this case, there is no obvious gap between the heat-conducting structure and the rotor winding 11, which can minimize the thermal resistance to ensure that heat can be efficiently transferred from the rotor winding 11 to the heat-conducting structure. For example, when using a metal plate as the heat-conducting structure, the metal plate can be directly welded to the surface of the rotor winding 11.

[0051] In addition, the heat-conducting structure can also be indirectly in contact with the rotor winding 11. For example, the heat-conducting structure is arranged in the accommodation space within the insulating layer between the coils of the rotor winding, so that the heat-conducting structure can timely absorb the heat generated by the coils and dissipate the heat through its own heat dissipation path.

[0052] Furthermore, the rotor winding 11 transfers heat to the heat-conducting structure connected thereto. The heat-conducting structure conducts the heat to the part extending outside the rotor winding 11, and this part is in contact with the air in the external environment and then conducts heat exchange with the air. In this way, the heat can be further transferred from the rotor winding 11 to the external environment, thereby reducing the temperature of the rotor winding 11.

[0053] In this application, there are various types of heat-conducting structures and connection methods between the heat-conducting structure and the rotor winding. Specifically, the heat-conducting structure includes a first heat-conducting structure 21, a second heat-conducting structure 22, and a third heat-conducting structure. Among them, the first heat-conducting structure 21 is arranged on the outer peripheral wall of the rotor winding (refer to Figure 1 ); the second heat-conducting structure 22 is arranged in the fixed component area of the rotor winding (refer to Figure 5 ); the third heat-conducting structure is at least partially embedded in the accommodation space between the coils of the rotor winding (refer to Figure 6 ).

[0054] In one embodiment, refer to Figure 1 , a plurality of the first heat-conducting structures 21 are arranged in an array along the circumferential and axial directions on the outer peripheral wall of the rotor to effectively solve the problem of uneven heat dissipation of the rotor winding 11.

[0055] Specifically, the array arrangement method of combining the circumferential and axial directions of the plurality of first heat-conducting structures 21 can increase the contact area between the first heat-conducting structures 21 and the rotor winding 11, quickly and fully absorb the heat generated by each part, avoid the accumulation of local heat. At the same time, the plurality of first heat-conducting structures 21 work in parallel, which can also improve the efficiency of heat conduction to the external environment.

[0056] In practical applications, according to the specific working conditions, the quantity and layout of the first heat-conducting structure 21 can be adjusted specifically to improve the heat dissipation performance of the rotor winding 11.

[0057] For example, since the heat dissipation conditions on the leeward side are not as good as those on the windward side, the first heat-conducting structures 21 are appropriately arranged more densely on the leeward side to increase the contact area between the first heat-conducting structures 21 and the leeward side, enhance the heat absorption capacity, and reduce the temperature difference between the windward side and the leeward side. Also, for example, in multiple regions of the rotor winding, local heat dissipation is prone to be poor, such as in regions with low wind speed or fixed component regions, etc. In these regions, the first heat-conducting structures 21 can also be appropriately arranged more densely to improve the heat dissipation performance of these regions.

[0058] Of course, there can also be various layout methods for the first heat-conducting structure 21, and it can be arranged in the Figure 1 step arrangement shown. This step arrangement can distribute the first heat-conducting structures 21 hierarchically according to the spatial structure of the rotor winding, enabling heat to be conducted orderly along the stepped path, increasing the heat transfer path and contact area to a certain extent, and being conducive to improving the heat dissipation efficiency.

[0059] In addition, the first heat-conducting structures 21 can also be arranged staggeredly. The staggered arrangement makes the adjacent first heat-conducting structures 21 stagger from each other, which can promote the heat exchange between the air and the first heat-conducting structures 21, and then take away heat more effectively.

[0060] In one embodiment, referring to Figure 2 , the rotor structure further includes heat dissipation fins 213. The heat dissipation fins 213 are generally made of a metal material with high thermal conductivity, and are arranged at one end of the first heat-conducting structure 21 away from the rotor winding 11 to increase the contact area between the first heat-conducting structure 21 and the air.

[0061] Specifically, referring to Figure 3 , the heat dissipation fins 213 are formed by multiple thin sheet-like structures arranged at intervals. These thin sheets extend vertically outward from the outer surface of the first heat-conducting structure 21 to form a three-dimensional heat dissipation structure similar to a comb. An appropriate distance is maintained between each thin sheet, which not only ensures that air can flow smoothly between the fins but also maximizes the contact area with the air. The larger the contact area, the faster the heat transfer rate.

[0062] In a preferred embodiment, the first heat-conducting structure 21 uses a heat pipe. Since the structural composition and working principle of the heat pipe are well-known technologies in the art, this application will not be elaborated in detail here.

[0063] One end of the heat pipe close to the rotor winding 11 serves as the evaporation end, and the other end is the condensation end. When the heat generated by the rotor winding 11 is transferred to the heat pipe, the phase-change working fluid inside the heat pipe quickly evaporates due to heat. At this time, the gaseous phase-change working fluid flows rapidly towards the condensation end under the drive of a very small pressure difference. At the condensation end, the gaseous phase-change working fluid conducts efficient heat exchange with the outside air, releases heat, and then re-condenses into a liquid phase-change working fluid. Subsequently, these liquid phase-change working fluids flow back to the evaporation end under the capillary force generated by the capillary structure inside the heat pipe. Through such a cyclic process, heat is continuously transferred from the evaporation end of the heat pipe to the condensation end, thereby achieving heat exchange and reducing the temperature of the rotor winding 11.

[0064] In one embodiment, referring to Figure 2 , the heat pipe includes a first section 211 and a second section 212 connected in sequence. The first section 211 is connected to the rotor winding 11 to ensure efficient absorption of the heat generated by the rotor winding 11. The second section 212 extends outside the rotor winding 11, and heat dissipation fins 213 are arranged on the outer surface of the second section 212.

[0065] Furthermore, the first section 211 and the second section 212 are transitionally connected through an arc section to form an "L"-shaped heat pipe, and the opening of the "L"-shaped heat pipe faces the rotation axis of the rotor winding 11. In this way, under the action of the centrifugal force generated by the rotation of the rotor winding 11, the condensed liquid-phase working fluid is like being subjected to an invisible "thrust", and can flow back to the evaporation section more smoothly along the inner wall of the arc section of the heat pipe.

[0066] In a specific implementation manner, referring to Figure 3 , a groove is formed on the coil of the rotor winding 11, and the evaporation end of the heat pipe is embedded in the groove, forming a tight contact between the two, so that the heat generated by the rotor winding 11 can be transferred to the evaporation end of the heat pipe faster.

[0067] In addition, in order to further optimize the heat transfer effect, a heat-conducting silicone grease with high thermal conductivity is filled in the groove to further reduce the thermal resistance and improve the heat transfer rate.

[0068] Referring to Figure 4 and 5 , in the common rotor structure design, a fixing component for fixing the rotor winding 11 is usually configured. This fixing component generally consists of a fixing plate 231 and an insulating part 232. Usually, the fixing plate 231 is made of a metal material with good thermal conductivity, while the insulating material used for the insulating part 232 usually has poor thermal conductivity, which makes the heat dissipation effect of the rotor winding 11 in the area of the fixing component poor.

[0069] To improve this situation, in this embodiment, a second heat conduction structure 22 is provided in the area of the rotor winding 11 close to the fixed component.

[0070] Specifically, a through hole 2320 for the second heat conduction structure 22 to pass through is provided on the insulating member 232, and a blind hole matching the second heat conduction structure 22 is provided on the fixing plate 231. During assembly, first, one end of the second heat conduction structure 22 is placed in a pre-opened groove in the rotor winding 11; then, the insulating member 232 is passed through the second heat conduction structure 22 through the through hole 2320 on it and tightly attached to the surface of the rotor winding 11 to ensure electrical insulation performance; after that, the fixing plate 231 is sleeved on the second heat conduction structure 22 through its blind hole, and the fixing plate 231 is closely attached to the insulating member 232; finally, the fixing plate 231 is fixed to the rotor core 10 using bolts 233 to complete the entire fastening connection.

[0071] In this way, the second heat conduction structure 22 can pass through the through hole 2320 on the insulating member 232 and be embedded in the blind hole of the fixing plate 231 to be connected to the fixing plate 231 with good heat conduction performance, and thus the heat generated by the rotor winding 11 can be conducted to the outside through the fixing plate 231, enhancing the heat dissipation capacity of this area.

[0072] In a preferred embodiment, the second heat conduction structure 22 adopts a heat pipe. The evaporation end of the heat pipe is embedded in the groove of the rotor winding 11, and the condensation end of the heat pipe passes through the through hole 2320 on the insulating member 232 and is embedded in the blind hole of the fixing plate 231 to be connected to the fixing plate 231 with good heat conduction performance. Further, to ensure the insulation performance between the fixing plate 231 and the heat pipe, insulating paint can be sprayed on the inner wall of the blind hole.

[0073] In one embodiment, to further enhance the heat dissipation effect, the heat dissipation fins 213 are attached to the outer surface of the fixing plate 231. In this way, the heat dissipation area can be effectively increased, accelerating the conduction of heat from the fixing plate 231 to the external environment and further improving the cooling efficiency.

[0074] In addition, to further optimize the heat transfer effect, heat-conducting silicone grease with high heat conduction performance can also be filled between the outer surface of the fixing plate 231 and the heat dissipation fins 213. The use of heat-conducting silicone grease can effectively fill the microscopic uneven gaps between the outer surface of the fixing plate 231 and the heat dissipation fins 213, further reducing the thermal resistance, so that heat can quickly transfer from the fixing plate 231 to the heat dissipation fins 213 and then be dissipated into the surrounding environment through the heat dissipation fins 213, improving the rate and efficiency of heat transfer.

[0075] In one embodiment, refer to Figure 6, a receiving space is formed in the insulating layer between adjacent coils of the rotor winding 11, and a third heat conduction structure is arranged in the receiving space. The third heat conduction structure can adopt forms such as heat pipes and flat micro heat pipe arrays.

[0076] In a preferred implementation, the third heat conduction structure adopts a VC heat pipe 24. The heat conduction mode of the VC heat pipe 24 is similar to that of a heat pipe. The difference is that the heat conduction mode of the VC heat pipe 24 is two-dimensional, that is, a surface heat conduction form. Therefore, relatively speaking, its heat transfer effect is higher. The technical principle and structural form of the VC heat pipe 24 are well-known technologies in the art, and will not be elaborated herein.

[0077] Reference Figure 7 , the VC heat pipe 24 is mainly composed of two relatively arranged bottom plates 243 and a frame 244 surrounding the periphery of the bottom plates 243. A cavity is formed by enclosing between the two bottom plates 243, and a phase change working fluid is filled in the cavity. The frame 244 is arranged around the periphery of the bottom plates 243, and its function is to seal the internal space of the heat pipe to prevent the working fluid from leaking, and at the same time can enhance the overall structural strength of the heat pipe. A plurality of support columns 245 are also evenly and spaced between the two bottom plates 243 to further improve the strength of the VC heat pipe 24.

[0078] To ensure electrical safety, an insulating layer 110 is arranged between the VC heat pipe 24 and the rotor winding 11, and the outer surface of the bottom plate 243 abuts against the insulating layer 110 to achieve insulating connection between the bottom plate 243 and the coil.

[0079] Reference Figure 5 , the VC heat pipe 24 is sandwiched between two adjacent coils, which can maximize the contact area between the VC heat pipe 24 and the rotor winding 11, thereby improving the heat exchange efficiency. Further, the VC heat pipe is arranged along the axial length direction of the rotor and covers as much as possible the main heat generation areas in the axial direction of the rotor winding 11. In this way, the VC heat pipe can utilize its high-efficiency heat conduction and heat equalization characteristics to evenly disperse the heat generated locally in the rotor winding 11 in the axial and circumferential directions, avoiding the problem of local overheating caused by heat concentration, and thus effectively improving the overall heat dissipation efficiency and thermal stability of the rotor winding 11.

[0080] In one embodiment, the VC heat pipe 24 includes a first part 241 and a second part 242 connected to the first part 241. The first part 241 is arranged in the receiving space, and the second part 242 extends out of the receiving space to transfer the heat in the rotor winding 11 to the external environment.

[0081] Specifically, when the rotor winding 11 operates to generate heat, the heat is transferred from the coil to the first part 241 of the VC heat pipe 24. At this time, the phase change working fluid in the first part 241 absorbs the heat from the coil, the temperature rises and it changes from liquid to gas; the gaseous phase change working fluid will flow from the first part 241 with a higher temperature to the second part 242 with a lower temperature; when the gaseous phase change working fluid flows to the second part 242 extending outside the accommodation space, since this part of the VC heat pipe 24 is in contact with the external environment and the temperature is relatively low, after the gaseous phase change working fluid contacts the inner wall surface of the second part 242, it releases heat to the surrounding environment through the inner wall of the second part 242 and re-condenses into liquid; the condensed liquid working fluid, under the action of the capillary structure on the inner wall of the VC heat pipe 24, uses the driving force generated by capillary action to flow back to the first part 241 along the capillary channel. In this way, the cycle repeats continuously, continuously transferring the heat generated by the rotor winding 11 to the external environment, realizing an efficient heat dissipation process.

[0082] In summary, the VC heat pipe 24 absorbs heat in the accommodation space through the first part 241, the steam flows inside to bring the heat to the second part 242, the second part 242 dissipates heat to the outside and the process of the liquid working fluid flowing back form a complete heat cycle, effectively transferring the heat in the rotor winding 11 to the environment and ensuring the normal operating temperature of the rotor winding 11.

[0083] In practical applications, according to the specific working conditions, the quantity and layout mode of the VC heat pipes 24 on the rotor winding 11 can be adjusted specifically to improve the heat dissipation performance of the rotor winding 11.

[0084] For example, at the position where the rotor winding 11 is prone to generate local hot spots, the VC heat pipes 24 are densely arranged so that they can quickly absorb a large amount of heat generated in this area; or, in response to the problem that there is a temperature difference between the leeward side and the windward side, the VC heat pipes 24 are appropriately arranged more densely on the leeward side to increase the contact area between the VC heat pipes 24 and the leeward side, enhance the heat absorption capacity and reduce the temperature difference between the windward side and the leeward side.

[0085] In one embodiment, referring to Figure 7 , in order to adapt to the area of the fixed component, the VC heat pipe 24 is provided with a notch 246 in this area. This can not only avoid spatial conflicts with the fixed component, but also ensure that the heat in this area is transferred through the VC heat pipe 24, transfer the heat to the second part 242 of the VC heat pipe 24, and finally dissipate it to the surrounding environment.

[0086] Furthermore, when the VC heat spreader 24 is provided with a notch 246 in this area, its cross-sectional area in this area is reduced accordingly. When the cross-sectional area is reduced, the flow rate of the phase-change medium will increase. The increase in the fluid velocity in this area helps to increase the rate of heat exchange, so that the rotor winding can more efficiently transfer heat to the VC heat spreader 24, and then dissipate it to the surrounding environment through the second part 242. Therefore, the VC heat spreader 24 can still maintain good heat dissipation performance in this area.

[0087] In addition, since the VC heat spreader 24 can ensure that the heat remains efficient and uniform during the transfer process, it is ensured that no local hot spot is formed in the area, which helps to ensure the uniformity of the temperature of the rotor winding 11.

[0088] As mentioned above, the present application cools the rotor winding 11 based on the phase change cooling principle of the heat-conducting structure, and relies on the vaporization latent heat of the liquid phase change working fluid being heated and converted into a gaseous state to carry away the heat generated by the rotor winding 11. It can cool various parts of the rotor winding 11, thereby further improving the heat dissipation performance of the rotor winding 11.

[0089] The present application provides a motor, which includes the above rotor structure. The rotor structure of the motor can maintain a suitable operating temperature under high load by using the above heat-conducting structure, thereby improving the stability and service life of the motor.

[0090] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A rotor structure, characterized in that: include: A rotor magnetic pole and a rotor winding (11) arranged on the rotor magnetic pole; A heat-conducting structure, one end of which is connected to the rotor winding (11) and the other end of which extends out of the rotor winding (11) so as to transfer the heat of the rotor winding (11) to the external environment.

2. The rotor structure according to claim 1, characterized in that: The heat-conducting structure comprises a first heat-conducting structure (21), and the first heat-conducting structure (21) is a heat pipe.

3. The rotor structure according to claim 2, characterized in that: The rotor structure further comprises: A heat dissipation fin (213) is arranged at an end of the first heat-conducting structure (21) away from the rotor winding (11).

4. The rotor structure according to claim 2, characterized in that: A plurality of the first heat-conducting structures (21) are arranged in an array on the outer peripheral wall of the rotor winding (11).

5. The rotor structure according to claim 2, characterized in that: A groove is provided on the outer peripheral wall of the rotor winding (11), and one end of the first heat-conducting structure (21) is arranged in the groove.

6. The rotor structure according to claim 3, characterized in that: The rotor structure further comprises: A fixing assembly is arranged outside the rotor winding (11), the fixing assembly fixes the rotor winding (11) to the rotor core (10), the fixing assembly comprises a fixing plate (231) and an insulating member (232) arranged on the inner surface of the fixing plate (231), and the insulating member (232) is provided with a through hole (2320); the heat conducting structure further comprises: A second heat-conducting structure (22) has one end connected to the rotor winding (11) and the other end passing through the through hole (2320) and connected to the fixing plate (231).

7. The rotor structure according to claim 6, characterized in that: The second heat-conducting structure (22) is a heat pipe, and the heat dissipation fins (213) are arranged on the outer surface of the fixing plate (231).

8. The rotor structure according to any one of claims 1 to 7, characterized in that: The rotor winding (11) comprises a plurality of turns of coils, and an accommodating space is formed in the insulating layer between adjacent coils. The heat-conducting structure further comprises: The third heat-conducting structure is at least partially disposed in the accommodating space.

9. The rotor structure according to claim 8, characterized in that: The third heat-conducting structure is a VC heat spreader (24).

10. A motor, characterized in that: The invention comprises a rotor structure as claimed in any one of claims 1 to 9.

Images