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 that an existing motor rotor structure is poor in cooling effect. In order to achieve the purpose, the rotor structure comprises a rotor body and a rotor winding arranged on the rotor body, the cooling pipeline is arranged on the rotor winding, the cooling pipeline comprises an input pipeline, an output pipeline and a plurality of branch pipelines arranged between the input pipeline and the output pipeline in a communicating mode, and the branch pipelines are attached to the rotor winding; and a cooling medium enters each branch pipeline from the input pipeline and is discharged from the output pipeline. According to the rotor structure, the cooling pipeline is arranged on the rotor winding, and the efficient heat dissipation effect can be achieved through heat exchange between the cooling medium in the cooling pipeline and the rotor winding. The operation stability of the rotor structure is improved, and the service life of the rotor structure and the service life of equipment are effectively prolonged.

Description

Technical Field

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

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

[0003] In the relevant technologies for cooling motor rotors, there are mainly two cooling methods: air cooling and pipe cooling. The air cooling method is to dissipate heat through air convection, while the pipe cooling method is to set a cooling pipe inside the rotor excitation winding, pass a cooling medium into the cooling pipe, and use the specific heat or latent heat of phase change of the cooling medium to take away the heat generated by the excitation winding. Compared with air cooling, the heat transfer performance of pipe cooling is better, and it can more effectively remove the heat generated inside the rotor, thereby maintaining a lower operating temperature. However, the pipe cooling technology also faces some problems in practical applications. For example, since the rotor will be affected by centrifugal force when rotating at high speed, this may cause the cooling medium pressure in the cooling pipe to be high and the flow stability to be poor, affecting the heat transfer performance, or because the cooling pipe is set too long, the flow resistance is large and the uniformity of the cooling performance is poor.

[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 problem, that is, to solve the problem of poor cooling effect of the existing motor rotor.

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

[0007] A rotor body and a rotor winding arranged on the rotor body;

[0008] A cooling pipeline is arranged on the rotor winding, and the cooling pipeline includes an input pipeline, an output pipeline, and a plurality of branch pipelines connected between the input pipeline and the output pipeline. The branch pipelines are in contact with the rotor winding, and the cooling medium enters each of the branch pipelines from the input pipeline and is discharged from the output pipeline.

[0009] Optionally, a plurality of the branch pipelines are arranged in parallel, and each of the branch pipelines is arranged along the circumference of the rotor winding.

[0010] Optionally, the output pipeline includes a first output pipeline and a second output pipeline, and the first output pipeline and the second output pipeline are respectively located on both sides of the input pipeline;

[0011] The liquid inlet ends of the branch pipelines are connected to the input pipeline, and the extension directions of any two adjacent branch pipelines are different. One of the branch pipelines is connected to the first output pipeline after surrounding the circumference of the rotor winding, and the other branch pipeline is connected to the second output pipeline after surrounding the circumference of the rotor winding, so that the flow direction of the cooling medium in the two adjacent branch pipelines is opposite.

[0012] Optionally, the branch pipeline is embedded in the rotor winding.

[0013] Optionally, the branch pipeline is attached to the inner surface or outer surface of the rotor winding.

[0014] Optionally, the cooling pipeline further includes:

[0015] A plurality of guide plates are arranged side by side in the output pipeline and close to the connection between the branch pipeline and the output pipeline, so that the cooling medium can be discharged along the guide plates toward the output end of the output pipeline after being discharged through the branch pipeline.

[0016] Optionally, a plurality of cooling pipes are provided on each rotor winding.

[0017] Optionally, the cooling medium is a phase change medium, and the rotor structure further includes:

[0018] A condenser has one end connected to the input end of the input pipeline and the other end connected to the output end of the output pipeline.

[0019] Optionally, the cooling medium is cooling water, and the rotor structure further comprises:

[0020] A liquid supply device comprises a pump device for providing circulation power for the cooling water, one end of the liquid supply device is connected to the input end of the input pipeline, and the other end is connected to the output end of the output pipeline.

[0021] In a second aspect, the present application provides an electric motor, comprising a rotor structure as described in any one of the first aspects.

[0022] In the case of adopting the above technical solution, the present application provides a rotor structure with a cooling pipeline on the rotor winding, and achieves efficient heat dissipation through heat exchange between the cooling medium in the cooling pipeline and the rotor winding. This not only improves the stability of the rotor structure operation, but also effectively prolongs the service life of the rotor structure and the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, in which:

[0024] Figure 1 It is a structural schematic diagram of the rotor winding and cooling pipeline assembly according to an embodiment of the present application;

[0025] Figure 2 is a schematic structural diagram of a cooling pipeline according to an embodiment of the present application;

[0026] Figure 3 yes Figure 2 Schematic diagram of the local structure of the cooling pipeline;

[0027] Figure 4 is a schematic structural diagram of a cooling pipeline according to another embodiment of the present application;

[0028] Figure 5 yes Figure 4 Schematic diagram of the local structure of the cooling pipeline;

[0029] Figure 6 is a schematic cross-sectional view of a local structure of a cooling pipeline according to an embodiment of the present application;

[0030] Figure 7 It is a schematic structural diagram of the cooling pipeline and the condenser assembly according to one embodiment of the present application;

[0031] Figure 8 yes Figure 7 Schematic diagram of the local structure. List of reference numerals:

[0032] 11-rotor winding, 111-inner surface, 112-outer surface, 20-cooling pipeline, 21-input pipeline, 22-output pipeline, 220-guide plate, 221-first output pipeline, 222-second output pipeline, 23-branch pipeline, 231-first branch pipeline, 232-second branch pipeline, 232-third branch pipeline, 24-condenser. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not used to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0034] It should be noted that in the description of this application, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, 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. Therefore, it cannot be understood as a limitation on this application. In addition, the ordinal numbers "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] 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 a direct connection or an indirect connection 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.

[0036] Please refer to Figure 1 , is a rotor structure according to an embodiment of the present application. The rotor structure includes a rotor body (not shown in the figure), and a plurality of magnetic poles (not shown in the figure) are arranged circumferentially of the rotor body, and a rotor winding 11 is arranged on each magnetic pole. In order to reduce the influence of the heat generated by the rotor winding 11 during operation on the rotor structure and the safe and stable operation of the unit, a cooling pipeline 20 is also arranged on the rotor winding 11 to achieve an efficient cooling effect.

[0037] Specifically, refer to Figure 2 The cooling pipeline 20 is composed of an input pipeline 21, an output pipeline 22, and a plurality of branch pipelines 23. The input pipeline 21 and the output pipeline 22 are generally arranged outside the rotor winding 11 to facilitate connection with other components. For example, the input pipeline 21 and the output pipeline 22 can be arranged on the same side of the rotor winding 11, or on different sides of the rotor winding 11.

[0038] Furthermore, the branch pipeline 23 connects the input pipeline 21 and the output pipeline 22. Each branch pipeline 23 is closely attached to the rotor winding 11. When the cooling medium flows inside the branch pipeline 23, it can exchange heat with the rotor winding 11 through the pipe wall, absorbing and taking away the heat generated by it.

[0039] Combined with reference Figure 3 , Figure 3The direction indicated by the middle arrow is the flow direction of the cooling medium. When the rotor winding 11 needs to be cooled, the cooling medium enters from the input pipeline 21, then splits and enters each branch pipeline 23 in sequence, the cooling medium flows inside the branch pipeline 23 and exchanges heat with the rotor winding 11, absorbs and takes away the heat of the rotor winding 11, and then the cooling medium is collected in the output pipeline 22 and discharged, completing a complete cooling cycle.

[0040] In one embodiment, multiple branch pipelines 23 are arranged in parallel, that is, the liquid inlet end of each branch pipeline 23 is connected to the input pipeline 21, and the liquid outlet end is connected to the output pipeline 22. In this way, after the cooling medium comes in from the input pipeline 21, it will be diverted to each branch pipeline 23, and each branch pipeline 23 works independently, and finally converges to the output pipeline 22 for discharge.

[0041] Furthermore, each branch pipeline 23 is disposed around the circumference of the rotor winding 11. That is, each branch pipeline 23 is arranged around the rotor winding 11 in circles.

[0042] refer to Figure 2 and 3 , an example is given in which three branch pipelines 23 are arranged in parallel between the input pipeline 21 and the output pipeline 22. The three branch pipelines 23 are respectively a first branch pipeline 231, a second branch pipeline 232 and a third branch pipeline 233.

[0043] The liquid inlet end and the liquid outlet end of the first branch pipeline 231 are connected to the input pipeline 21 and the output pipeline 22 respectively, and the main pipeline of the first branch pipeline 231 surrounds the rotor winding 11 in the circumferential direction. Figure 2 and Figure 3 As shown in FIG. 2 , two circles are provided to ensure that the first branch pipeline 231 can fully contact the rotor winding 11 to improve the cooling effect.

[0044] The second branch pipeline 232 and the third branch pipeline 233 are arranged in parallel with the first branch pipeline 231 , and the connection method between them and the input pipeline 21 and the output pipeline 22 is the same as that of the first branch pipeline 231 .

[0045] The multiple branch pipes 23 in the cooling pipe 20 provided in this embodiment are arranged in parallel, and they are respectively connected to the input pipe 21 and the output pipe 22, and each branch pipe 23 is arranged along the circumference of the rotor winding 11, and usually surrounds multiple circles, and the internal path of the multiple circles is similar to the series structure. It can be seen that the structural form of the branch pipe 23 combines the layout mode of series and parallel.

[0046] Specifically, first, from the perspective of series connection, each branch pipeline 23 in this embodiment is arranged on the rotor winding 11 in a multi-circle manner, that is, the cooling medium surrounds the rotor winding 11 in a single branch pipeline 23 for multiple circles along the circumference of the rotor winding 11. This design not only increases the contact area between the branch pipeline 23 and the rotor winding 11, but also improves the cooling efficiency. At the same time, when the pipeline length is the same, this method can also reduce the number of parallel branches, thereby reducing the instability of the cooling medium flow caused by the influence of centrifugal force, and the phenomenon of reflux between the branches.

[0047] Secondly, from the perspective of parallel connection, a plurality of branch pipelines 23 are provided in the cooling pipeline 20, and these branch pipelines 23 are independently connected to the input pipeline 21 and the output pipeline 22. In this way, the cooling medium can flow through the plurality of branch pipelines 23 at the same time, which can not only evenly distribute the flow of the cooling medium, but also avoid the problem of decreased cooling effect caused by the increase of the cooling medium temperature in the rear section of the pipeline due to the excessive length of the pipeline, thereby improving the uniformity of the temperature distribution of the rotor winding along the radial direction.

[0048] The cooling pipeline 20 adopts a combination of series and parallel connection, which not only improves the overall efficiency of the cooling system, allowing the cooling medium to fully exchange heat with the rotor winding 11, but also optimizes the flow characteristics of the cooling medium in the pipeline under high-speed rotation environment, ensuring the stable flow of the cooling medium and the cooling effect.

[0049] In one embodiment, a plurality of cooling pipes 20 are arranged in parallel on the rotor winding 20 to improve the cooling efficiency and the uniformity of the temperature distribution. However, in practical applications, the layout of the cooling pipes 20 also needs to comprehensively consider the structural dimensions, heating power, and actual installation conditions of the rotor winding 11. In addition, the total amount of cooling medium delivered in the cooling pipes 20 can be adjusted to meet the cooling requirements of different rotor windings 11.

[0050] In a specific embodiment, reference Figure 1 The branch pipeline 23 is attached to the inner surface 111 or the outer surface 112 of the rotor winding 11 , which can not only cool the rotor winding 11 but also reduce the structural modification cost of the rotor winding 11 .

[0051] In another preferred embodiment, a receiving groove is provided inside the rotor winding 11. The receiving groove is a small cavity or groove with a specially designed configuration. Its main function is to provide an embedding space for the branch pipeline 23 so that the branch pipeline 23 can be embedded in the receiving groove.

[0052] By embedding the branch pipeline 23 in the receiving groove, a close combination with the inside of the rotor winding 11 can be achieved, and the contact area between the branch pipeline 23 and the rotor winding 11 is greatly increased, thereby enhancing the heat exchange efficiency.

[0053] In addition, the fitting mode of the branch pipe 23 and the rotor winding 11 can be adjusted according to the actual cooling requirements and winding structure. For example, in the area that needs to be cooled, the density of the branch pipe 23 can be increased or its shape or size can be adjusted to provide a more concentrated cooling effect.

[0054] In one embodiment, in order to improve the uniformity of cooling the rotor winding 11 , the flow direction of the cooling medium is controlled to ensure that the entire rotor winding 11 can be evenly cooled.

[0055] In a specific implementation, the input pipeline 21 is arranged between the two output pipelines 22 to form a central liquid supply structure. Then, by reasonably setting the positions of the liquid inlet and liquid outlet of the branch pipeline 23, the flow direction of the cooling medium can be accurately controlled. For example, the liquid inlet is connected to the input pipeline 21, and the liquid outlet of each branch pipeline 23 is connected to a different output pipeline 22. In this way, the direction in which the branch pipeline 23 surrounds the rotor winding 11 can be changed, so that the cooling medium can flow in a specific direction when flowing in the branch pipeline 23, ensuring that the heat can be evenly taken away from each part of the rotor winding 11.

[0056] Specifically, refer to Figure 4 and 5 The input pipeline 21 is arranged between the first output pipeline 221 and the second output pipeline 222. The input pipeline 21 is responsible for conveying the cooling medium to the branch pipelines 23. The liquid inlet ends of each branch pipeline 23 are connected to the input pipeline 21, and the extension directions of any two adjacent branch pipelines 23 are different.

[0057] For example, one branch pipeline 23 is connected to the first output pipeline 221 after being wound in the clockwise direction of the rotor winding 11, and the cooling medium flows out from the input pipeline 21, flows in the clockwise direction of the rotor winding 11, and flows to the first output pipeline 221 after absorbing heat. The other adjacent branch pipeline 23 is connected to the second output pipeline 222 after being wound in the counterclockwise direction of the rotor winding 11, and the cooling medium flows out from the input pipeline 21, flows in the counterclockwise direction of the rotor winding 11, and flows to the second output pipeline 222 after absorbing heat. This makes the flow directions of the cooling medium in the two adjacent branch pipelines 23 opposite.

[0058] In this way, the non-uniformity of the temperature of the rotor winding 11 in the circumferential and radial directions can be significantly reduced, and local excessive temperatures can be avoided, thereby improving the overall cooling effect.

[0059] In the above embodiment, a layout of a group of input pipelines 21 and output pipelines 22 is taken as an example, wherein the input pipeline 21 is located between two output pipelines 22 to form a central liquid supply structure. Of course, according to actual conditions, multiple groups of such structures can also be used to further enhance the cooling effect and balance.

[0060] Furthermore, each branch pipeline 23 is connected in parallel to the output pipeline 22, and the cooling medium directly flows from the liquid outlet of each branch pipeline 23 into the output pipeline 22. In this case, since the cooling medium of multiple branch pipelines 23 flows into the output pipeline 22 at the same time, the pressure of the cooling medium in the branch pipeline 23 may increase under the action of high centrifugal acceleration, causing problems such as uneven flow, flow velocity fluctuation and inconsistent flow direction, and even forming an internal circulation between the branch pipelines 23, affecting the flow stability of the cooling medium, and further affecting the heat exchange efficiency.

[0061] Therefore, in one embodiment, reference Figure 6 The cooling pipeline 20 further includes a plurality of guide plates 220, which are arranged side by side in the output pipeline 22 and close to the connection between the branch pipeline 23 and the output pipeline 22. One end of the guide plate 220 is connected to the liquid outlet end of the branch pipeline 23, and the other end is bent and extended toward the output end of the output pipeline 22, so that the cooling medium can be discharged from the branch pipeline 23 and then discharged toward the output end of the output pipeline 22 along the guide plate 220.

[0062] In a specific implementation, refer to Figure 6 Still taking the example of three branch pipelines 23 , namely a first branch pipeline 231 , a second branch pipeline 232 and a third branch pipeline 233 , these three pipelines are arranged in sequence along the output direction of the output pipeline 22 . Figure 6 The middle arrow indicates the flow direction of the cooling medium. The side of the output pipeline 22 away from the output end is designed to be sealed, and the first branch pipeline 231 is close to the seal. Since the first branch pipeline 231 is located close to the seal, the side wall of the output pipeline 22 naturally plays the role of a guide plate 220, guiding the cooling medium to flow along the inner wall of the output pipeline 22 to the output end.

[0063] The second branch pipeline 232 and the third branch pipeline 233 are sequentially arranged side by side with the first branch pipeline 231, and the liquid outlet ends of the second branch pipeline 232 and the third branch pipeline 233 are both provided with guide plates 220. The design of these guide plates 220 optimizes the flow path of the cooling medium, ensuring that the cooling medium discharged from the second branch pipeline 232 and the third branch pipeline 233 can flow to the output end of the output pipeline 22 along a predetermined direction.

[0064] Through the guidance of the guide plate 220, the flow direction of the cooling medium can be more effectively controlled to avoid turbulence and backflow (i.e., flow into adjacent branch pipes) of the cooling medium at the confluence of the output pipe 22, thereby ensuring that the cooling medium flows smoothly to the output end. At the same time, through the guidance of the guide plate 220, the flow resistance can be reduced and the cooling efficiency can be improved.

[0065] In one embodiment, the cooling medium is cooling water, and the rotor structure further includes a liquid supply device, which includes a pump device for providing circulation power for the cooling water, one end of the liquid supply device is connected to the input end of the input pipeline 21, and the other end is connected to the output end of the output pipeline 22. Through this design, the cooling water can form a closed-loop circulation system to ensure the continuous supply of the cooling medium, improve the cooling efficiency and system reliability.

[0066] It should be noted that although cooling water is used as an example in the above embodiments, this does not constitute a limitation to the present application, and the cooling medium may also be other types of coolants, or a mixture of multiple coolants. Any material that can exchange heat with the rotor winding 11 to produce a cooling effect is within the protection scope of the present application.

[0067] In another embodiment, the cooling medium is a phase change fluid, which is a substance that can undergo phase changes, such as conversion between liquid and gas. For example, when the phase change fluids absorb heat, they can change from liquid to gas, and during the cooling process, they can change from gas back to liquid to release heat. By using the latent heat of phase change for heat exchange, the system can effectively absorb and release a large amount of heat within a smaller temperature range, with higher cooling efficiency and stability.

[0068] Further, refer to Figure 7 and 8 The rotor structure is also equipped with a condenser 24 , which is connected to the cooling pipeline 20 and is located above the rotor winding 11 .

[0069] Specifically, one end of the condenser 24 is connected to the input end of the input pipeline 21, and the other end is connected to the output end of the output pipeline 22. The liquid cooling medium enters each branch pipeline 23 through the input pipeline 21, performs heat exchange with the rotor winding 11, and changes from liquid to gas or gas-liquid mixed state after absorbing heat. Subsequently, these gaseous or gas-liquid mixed cooling media enter the condenser 24 through the output pipeline 22, perform heat exchange with the secondary cooling gas or cooling liquid in the condenser 24, release heat and convert back into liquid.

[0070] Since the density of liquid cooling medium is relatively large, and the density of gaseous or gas-liquid mixed cooling medium is relatively small, the density difference between the two states of cooling medium can form a pressure difference in the cooling pipeline 20, thereby driving the cooling medium to flow in the cooling pipeline 20. In this way, the cooling medium forms a self-circulation in the cooling pipeline 20. Compared with the form of an external pump, there is no input of external energy, and the structure is simpler. At the same time, the circulation flow of the cooling medium can be automatically matched and adjusted according to the heating power of the rotor winding.

[0071] In summary, by connecting the output pipe 22 to the upper part of the condenser 24, the gaseous or gas-liquid mixed cooling medium that absorbs heat from the rotor winding 11 is transported, and condensed into liquid in the condenser 24, and then transported back to the system through the input pipe 21. Such a circulation design not only ensures the effective utilization of the medium, but also maintains the pressure balance inside the system, thereby ensuring the stable operation of the entire cooling system.

[0072] The present application provides a motor, which includes the rotor structure as described above. The rotor structure of the motor can maintain a suitable operating temperature under high load by using the cooling solution as described above, thereby improving the stability and service life of the motor.

[0073] 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 body and a rotor winding (11) arranged on the rotor body; A cooling pipeline (20) is arranged on the rotor winding (11), the cooling pipeline (20) comprising an input pipeline (21), an output pipeline (22), and a plurality of branch pipelines (23) arranged in communication between the input pipeline (21) and the output pipeline (22), the branch pipelines (23) being in contact with the rotor winding (11), and a cooling medium respectively enters each of the branch pipelines (23) from the input pipeline (21) and is discharged from the output pipeline (22).

2. The rotor structure according to claim 1, characterized in that: A plurality of branch pipelines (23) are arranged in parallel, and each branch pipeline (23) is arranged in a surrounding manner along the circumference of the rotor winding (11).

3. The rotor structure according to claim 1, characterized in that: The output pipeline (22) comprises a first output pipeline (221) and a second output pipeline (222), wherein the first output pipeline (221) and the second output pipeline (222) are respectively located on two sides of the input pipeline (21); The liquid inlet ends of the branch pipelines (23) are connected to the input pipeline (21); any two adjacent branch pipelines (23) extend in different directions; one of the branch pipelines (23) is connected to the first output pipeline (221) after being wound along the circumference of the rotor winding (11); and the other branch pipeline (23) is connected to the second output pipeline (222) after being wound along the circumference of the rotor winding (11), so that the flow directions of the cooling medium in the two adjacent branch pipelines (23) are opposite.

4. The rotor structure according to claim 1, characterized in that: The branch pipeline (23) is embedded in the rotor winding (11).

5. The rotor structure according to claim 1, characterized in that: The branch pipeline (23) is attached to the inner surface (111) or the outer surface (112) of the rotor winding (11).

6. The rotor structure according to claim 1, characterized in that: The cooling pipeline (20) further comprises: A plurality of guide plates (220) are arranged side by side in the output pipeline (22) and close to the connection between the branch pipeline (23) and the output pipeline (22), so that the cooling medium can be discharged along the guide plates (220) toward the output end of the output pipeline (22) after being discharged through the branch pipeline (23).

7. The rotor structure according to claim 1, characterized in that: A plurality of cooling pipes (20) are arranged on each rotor winding (11).

8. The rotor structure according to any one of claims 1 to 8, characterized in that: The cooling medium is a phase-changing medium, and the rotor structure further comprises: A condenser (24) has one end connected to the input end of the input pipeline (21) and the other end connected to the output end of the output pipeline (22).

9. The rotor structure according to any one of claims 1 to 8, characterized in that: The cooling medium is cooling water, and the rotor structure further comprises: A liquid supply device comprises a pump device for providing circulation power for the cooling water, one end of the liquid supply device is connected to the input end of the input pipeline (21), and the other end is connected to the output end of the output pipeline (22).

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

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