A rotor structure, electric machine

Abstract

The application provides a rotor structure and a motor, in order to solve the above problems, the application provides a rotor structure, characterized by comprising: a rotor core and an impeller, the rotor core comprises a first core and a second core, a plurality of second through holes are arranged on the first core, the second core is provided with a plurality of first through holes, along the axial direction of the rotor core, the first core, the impeller and the second core are arranged in sequence, the impeller can discharge the airflow in the first through hole and the second through hole out of the rotor core along the radial direction of the rotor core. According to the application, it belongs to an energy-saving starting motor and an energy-saving motor, and the technical problem of high temperature of the motor rotor in the prior art can be solved.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to a rotor structure and a motor, which is an energy-saving starter motor and an energy-saving electric motor. Background Technology

[0002] See also Figure 1 As shown, existing built-in motor rotors, when applied to motors, generally use a solid rotor shaft. The rotor core is formed by integrally stacking silicon steel sheets, with magnets 2 embedded in the rotor core 1. End rings 3 are used to fix the rotor core on both sides and are assembled onto the rotor shaft 4 to form the motor rotor. Because the motor rotor is located inside the motor, and due to the wind friction and alternating electromagnetic field effects of the rotating rotor, the solid rotor shaft, rotor core, and end rings generate a lot of eddy current heat, making heat dissipation difficult. This results in a very high rotor temperature, sometimes reaching nearly 300 degrees Celsius, severely affecting the performance of permanent magnets and even posing a risk of demagnetization. To meet usage requirements, expensive high-temperature resistant permanent magnets must be selected, which also leads to performance degradation. The large mass of the solid motor rotor results in a large moment of inertia, decreased rotor dynamics, and slower rotor response speed during speed regulation.

[0003] Because the solid rotor shaft, rotor core, and end rings in the existing technology generate a lot of eddy current heat and are difficult to dissipate, resulting in high rotor temperature and other technical problems, this invention studies and designs a rotor structure and motor that belongs to the category of energy-saving starter motors and energy-saving electric motors. Summary of the Invention

[0004] Therefore, the present invention provides a rotor structure and a motor, which belong to the category of energy-saving starter motors and energy-saving electric motors, and can solve the technical problem of high rotor temperature in existing motors.

[0005] To address the aforementioned problems, the present invention provides a rotor structure, characterized in that it comprises a rotor core and an impeller. The rotor core includes a first core and a second core. The first core has a plurality of second through holes, and the second core has a plurality of first through holes. The first core, the impeller, and the second core are arranged sequentially along the axial direction of the rotor core. The impeller is capable of discharging the airflow in the first through holes and the second through holes radially out of the rotor core.

[0006] In some embodiments, along the axial direction of the rotor core, the second through hole and the first through hole extend along the axial direction of the rotor core, a plurality of second through holes are arranged at intervals along the circumference of the first core, a plurality of first through holes are arranged at intervals along the circumference of the second core, and the second through holes and the first through holes are opposite each other.

[0007] In some embodiments, magnets are provided on the first core and the second core, and the second through hole and the first through hole are located radially inside the magnets along the radial direction of the rotor core.

[0008] In some embodiments, end rings are provided at the ends of the first iron core facing away from the impeller and at the ends of the second iron core facing away from the impeller.

[0009] In some embodiments, the end ring is provided with a plurality of third through holes, and the third through holes are arranged in a one-to-one correspondence with the first through holes.

[0010] In some embodiments, the impeller includes two baffles and blades, the blades being located between the two baffles, and the baffles being provided with a plurality of fourth through holes, the fourth through holes being arranged in a one-to-one correspondence with the first through holes.

[0011] In some embodiments, the blades are located radially outside the fourth through hole along the radial direction of the rotor core.

[0012] In some embodiments, the blades are cross-flow blades.

[0013] In some embodiments, a rotating shaft is also included, along the axial direction of the rotor core, with the first core, the impeller, and the second core sequentially mounted on the rotating shaft.

[0014] The present invention also provides an electric motor comprising the aforementioned rotor structure.

[0015] The rotor structure and motor provided by this invention have the following beneficial effects: The first iron core, the impeller, and the second iron core are arranged sequentially. The impeller rotates with the shaft. When the impeller rotates with the shaft, a negative pressure is formed on the radially outer side of the impeller. This allows the airflow in the first and second through holes to enter the impeller and, under the action of the impeller, to be discharged radially. This allows cold air to flow rapidly through the rotor's interior, thus carrying away the heat inside the rotor. Simultaneous air intake from both sides of the rotor iron core improves heat exchange efficiency. Due to the viscosity of the gas, the air inside the impeller flows radially, which also drives the airflow on the outer peripheral wall of the rotor. This causes cold air to continuously flow across the outer surface of the rotor, forming airflow between the outer surface and the inner hole of the rotor, providing all-round cooling of the rotor. This efficiently removes heat from the rotor's silicon steel sheets and magnets, achieving efficient heat dissipation at both high and low speeds, thus achieving the purpose of cooling the rotor. This provides an energy-saving starter motor and an energy-saving electric motor. Attached Figure Description

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a rotor in the prior art; Figure 2 This is an assembly structure diagram of the rotor structure of the present invention; Figure 3 This is a cross-sectional view of the rotor structure of the present invention; Figure 4 This is a schematic diagram of the end ring structure in the rotor structure of the present invention; Figure 5 yes Figure 3 Sectional view of AA; Figure 6 This is a perspective view of the rotor structure of the present invention; Figure 7 This is a diagram showing the gas flow direction in the rotor structure of the present invention; Figure 8 This is a schematic diagram of the impeller structure in the rotor structure of the present invention.

[0018] The attached figures are labeled as follows: 1. Rotor core; 2. Magnet; 3. End ring; 4. Shaft; 5. First through hole; 6. Impeller; 7. Third through hole; 8. Second through hole; 9. First core; 10. Second core; 11. Baffle; 12. Blade. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0021] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0022] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0023] See also Figure 1-8As shown, according to an embodiment of the present invention, a rotor structure is provided, including: a rotor core 1 and an impeller 6. The rotor core 1 includes a first core 9 and a second core 10. The first core 9 is provided with a plurality of second through holes 8, and the second core 10 is provided with a plurality of first through holes 5. The first core 9, the impeller 6, and the second core 10 are arranged sequentially along the axial direction of the rotor core 1. The impeller 6 is capable of discharging the airflow in the first through holes 5 and the second through holes 8 out of the rotor core 1 along the radial direction of the rotor core 1. In this technical solution, the first iron core 9, the impeller 6, and the second iron core 10 are arranged sequentially. The impeller 6 rotates with the shaft 4. When the impeller 6 rotates with the shaft 4, a negative pressure is formed on the radially outer side of the impeller 6. This causes the airflow in the first through hole 5 and the second through hole 8 to enter the impeller 6 and then be discharged radially under the action of the impeller 6. This allows cold air to flow quickly through the rotor, thereby carrying away the heat inside the rotor. Simultaneous air intake from both sides of the rotor iron core 1 improves heat exchange efficiency. Due to the viscosity of the gas, the air inside the impeller 6 flows radially, which also drives the airflow on the outer peripheral wall of the rotor. This causes cold air to continuously flow over the outer surface of the rotor, forming airflow between the outer surface and the inner hole of the rotor, providing all-round cooling for the rotor. This efficiently removes the heat from the rotor's silicon steel sheets and magnets, achieving efficient heat dissipation at both high and low speeds, thus achieving the purpose of cooling the rotor. This provides an energy-saving starter motor and an energy-saving electric motor.

[0024] In some embodiments, the impeller 6 is located between the first iron core 9 and the second iron core 10, and along the axial direction of the rotor iron core 1, the impeller 6 and the first iron core 9 are in close contact.

[0025] In some embodiments, the second through hole 8 and the first through hole 5 extend along the axial direction of the rotor core 1.

[0026] In some embodiments, along the axial direction of the rotor core 1, the second through hole 8 and the first through hole 5 extend along the axial direction of the rotor core 1, a plurality of second through holes 8 are arranged at intervals along the circumference of the first core 9, a plurality of first through holes 5 are arranged at intervals along the circumference of the second core 10, and the second through holes 8 and the first through holes 5 are opposite each other.

[0027] In this technical solution, multiple second through holes 8 are arranged at intervals along the circumference of the first iron core 9, and multiple first through holes 5 are arranged at intervals along the circumference of the second iron core 10. The second through holes 8 and the first through holes 5 are one-to-one, which can match the structure and assembly, ensure smooth air circulation, and improve heat dissipation efficiency.

[0028] It should be noted that the structure, size, and shape of the first iron core 9 and the second iron core 10 are exactly the same.

[0029] In some embodiments, magnets 2 are provided on the first iron core 9 and the second iron core 10, and the second through hole 8 and the first through hole 5 are located radially inside the magnets 2 along the radial direction of the rotor iron core 1.

[0030] In this technical solution, along the radial direction of the rotor core 1, the second through hole 8 is located radially inside the magnet 2 on the first core 9, and the first through hole 5 is located radially inside the magnet 2 on the second core 10. The first through hole 5 and the second through hole 8 not only allow airflow to pass through for heat dissipation of the rotor core 1, but also reduce the weight of the rotor core. The evenly distributed slots are beneficial for rotor dynamic balance. Furthermore, the fact that the second through hole 8 and the first through hole 5 are located radially inside the magnet 2 ensures that they do not affect the magnetic circuit on the magnet 2.

[0031] In some embodiments, the first iron core 9 and the second iron core 10 are provided with magnetic slots, and the magnet 2 is inserted into the magnetic slots.

[0032] In some embodiments, the rotor core is made of stacked silicon steel sheets. The portion of the silicon steel sheets other than the position where the magnets are placed has evenly distributed second through holes 8 and first through holes 5, thereby reducing the weight of the stacked rotor core. The evenly distributed slots are beneficial to the dynamic balance of the rotor. At the same time, the through holes and slots are also channels for cooling air and increase the heat dissipation area of ​​the rotor, thus providing a basis for achieving efficient heat dissipation.

[0033] In some embodiments, an end ring 3 is provided at the end of the first iron core 9 facing away from the impeller 6 and at the end of the second iron core facing away from the impeller 6.

[0034] In this technical solution, the end ring 3 is sleeved on the rotating shaft 4. The end ring 3 can exert a pressing effect on the silicon steel sheets that make up the rotor core 1 and the magnets 2 in the rotor core 1, so as to ensure the structural strength of the rotor core 1.

[0035] In some embodiments, the end ring 3 is interference-fitted with the rotating shaft 4. Of course, the end ring 3 can also be fixed to the rotating shaft 4 in other ways.

[0036] The rotor structure of this invention features a rotor core with slotted design to remove unnecessary weight from the inner ring, achieving weight reduction. An interference fit with the rotor shaft enables torque output. Magnets are assembled by neatly inserting them into the magnet slots in the rotor core. Both end rings and the impeller 6 are also interference-fitted with the rotor shaft, and a press is used to achieve the overall connection. The entire machine has a simple, compact, and modular design and assembly, facilitating easy processing. Fully automated production is possible.

[0037] In some embodiments, the end ring 3 is provided with a plurality of third through holes 7, and the third through holes 7 are arranged in a one-to-one correspondence with the first through holes 5.

[0038] In this technical solution, when the shaft 4 rotates, the airflow enters the first through hole 5 through the third through hole 7 on one side of the rotor core 1, and enters the second through hole 8 through the third through hole 7 on the other side of the rotor core 1. Under the action of the impeller 6, the airflow is discharged radially from the rotor core 1, thereby achieving cooling of the rotor core 1.

[0039] In some embodiments, the impeller 6 includes two baffles 11 and blades 12, the blades 12 being located between the two baffles 11, and the baffles 11 having a plurality of fourth through holes arranged in a one-to-one correspondence with the first through holes 5.

[0040] In this technical solution, the airflow in the first through hole 5 and the second through hole 8 enters between the two baffles 11 through the fourth through hole, and is discharged radially from the rotor core 1 under the action of the impeller 6, thereby achieving cooling of the rotor core 1.

[0041] In some implementations, the first through hole 5, the second through hole 8, the third through hole 7, and the fourth through hole are all identical in shape and size to ensure smooth airflow.

[0042] In some embodiments, a through hole is provided in the center of the baffle 11. The through hole is exactly the same in size and shape as the inner circle of the rotor core 1. The baffle 11 is fixedly connected to the rotating shaft 4 by interference fit or other means through the through hole. The baffle 11 is annular and its shape is consistent with that of the rotor core 1.

[0043] In some embodiments, there is a connecting section between the two baffles 11. The connecting section is tubular and its inner diameter is exactly the same as the inner circle of the rotor core 1 in size and shape. The connecting section is fixedly connected to the rotating shaft 4 by interference fit or other means.

[0044] In some implementations, the wall thickness of the connecting section is less than the minimum distance between the fourth through hole and the central through hole of the baffle 11, that is, the wall thickness of the connecting section will not affect the flow area of ​​the fourth through hole.

[0045] In some embodiments, the blade 12, baffle 11, and connecting section are integrally formed, that is, the blade 12, baffle 11, and connecting section are integrally die-cast.

[0046] In some embodiments, the blade 12 is located radially outside the fourth through hole along the radial direction of the rotor core 1.

[0047] In this technical solution, the blade 12 is located radially outside the fourth through hole, so that when the impeller 6 rotates, the airflow flows into the space between the two baffles through the fourth through hole. Under the action of the blade 12, the airflow can flow out radially along the rotor core 1.

[0048] In some embodiments, there are multiple blades 12, which are arranged sequentially along the circumference of the baffle 11.

[0049] In some embodiments, the blade 12 is a cross-flow blade.

[0050] In this technical solution, the blade 12 adopts a cross-flow blade, thereby forming a cross-flow impeller with the impeller 6. The cross-flow impeller causes the air to flow in the radial direction of the rotor, thereby driving the surrounding air to flow from both ends of the rotor along the outer circular surface and inner hole of the rotor. The cross-flow impeller enables the cooling air to flow efficiently, carrying away the heat from the inner and outer circular surfaces of the rotor, forming efficient heat dissipation.

[0051] The rotor structure of this invention features a rotor core made of stacked silicon steel sheets. The portion of the silicon steel sheets excluding the magnet placement area has evenly distributed through-hole slots to reduce the weight of the stacked rotor core. These evenly distributed slots facilitate rotor dynamic balance. The magnet slots are arranged according to the motor's electromagnetic design scheme. This rotor core can be achieved using a mature silicon steel sheet punching machine and molds for punching and stacking. The magnets are prefabricated, with their cross-sections prefabricated according to the slot shape of the motor's electromagnetic design scheme, and then assembled into the rotor core. The impeller 6 is integrally die-cast and has an interference fit mounting hole with the rotor shaft. After the impeller end ring is assembled onto the rotor, as the rotor rotates, the cross-flow impeller causes air to flow radially towards the rotor, thereby driving the surrounding air to flow from both ends of the rotor along the outer surface and inner hole of the rotor. The cross-flow impeller ensures efficient cooling airflow, carrying heat from the inner and outer surfaces of the rotor, resulting in efficient heat dissipation.

[0052] It should be noted that the cross-flow impeller allows air to enter from the axial direction of the motor rotor and flow out from the radial direction of the motor rotor.

[0053] It should be noted that the cross-flow impeller causes the air to flow outwards in a centrifugal manner, which creates a negative pressure inside the motor rotor. Under the action of the negative pressure, the air on both sides will flow towards the middle, that is, flow in opposite directions.

[0054] It should be noted that after the cross-flow impeller discharges the internal air radially, a negative pressure will be formed inside. Under the action of negative pressure, the air on both sides of the axis is simply filled and there will be no energy loss due to collision. If the two sides of the axis are separated, it will affect the airflow because there is an obstruction. The fluid has viscosity on the obstruction, resulting in flow energy loss.

[0055] It should be noted that blade 12 can be a common cross-flow fan blade, but to achieve the best effect, the blade angle needs to be optimized according to the rotor's heat generation, the required air volume, and the cooling power required.

[0056] In some embodiments, a rotating shaft 4 is also included, along the axial direction of the rotor core, with the first core 9, the impeller 6, and the second core 10 sequentially mounted on the rotating shaft 4.

[0057] In this technical solution, the first iron core 9, the impeller 6, and the second iron core 10 are sequentially mounted on the rotating shaft 4. The first iron core 9, the impeller 6, and the second iron core 10 rotate synchronously, thereby causing the air inside the impeller 6 to flow out along the radial direction of the rotor iron core 1, generating an air pressure difference inside the rotor, causing cold air to flow quickly through the inside of the rotor, thereby carrying away the heat inside the rotor.

[0058] In some embodiments, the inner diameters of the first iron core 9, the impeller 6, and the second iron core 10 are the same, that is, the central axes of the first iron core 9, the impeller 6, and the second iron core 10 coincide.

[0059] In some embodiments, the impeller 6 is connected to the shaft 4 by an interference fit. Of course, the impeller 6 can also be fixed to the shaft 4 by other fixing methods, as long as the shaft 4 drives the impeller 6 to rotate.

[0060] The rotor structure of this invention utilizes the design of the rotor core, magnets, and cross-flow impeller, along with an overall efficient heat dissipation method and an integrated rotor structure design concept. This optimizes the overall design of the motor rotor structure, enabling efficient airflow heat dissipation on the inner and outer circular surfaces of the rotor.

[0061] The rotor structure of the present invention can also solve the following problems: 1. Solve the problem of high temperature of permanent magnets inside the rotor of built-in motor, which leads to the risk of high-temperature demagnetization of permanent magnets; 2. Solve the problem of rotor temperature rise; 3. Solve the problem of difficult heat dissipation and low heat dissipation efficiency of natural air cooling of motor rotor; 4. Solve the problem of decreased rotor dynamic performance caused by longer motor rotor shaft.

[0062] The rotor structure of this invention features a rotor core made of stacked silicon steel sheets. The portion of the silicon steel sheets excluding the magnet placement areas incorporates evenly distributed through-hole slots, reducing the weight of the stacked rotor core. These evenly distributed slots facilitate rotor dynamic balance and also serve as cooling air channels, increasing the rotor's heat dissipation area and providing a foundation for efficient heat dissipation. The rotor core utilizes slotting to remove unnecessary weight from the inner ring, reducing rotor weight, moment of inertia, and improving rotor dynamic performance, making it suitable for motors with frequent frequency conversion speed regulation. The segmented magnets and the ventilation slot structure of the silicon steel sheets facilitate rotor processing and assembly, achieving efficient heat dissipation and solving the problem of high cost associated with expensive high-temperature resistant magnets. Conventional permanent magnets can be used, thereby enhancing the motor's cost competitiveness in the market.

[0063] The rotor structure of the present invention has a cross-flow impeller designed in the middle of the rotor. The impeller can be designed with different numbers and sizes of blades according to the requirements of rotational speed and heat dissipation air volume, so as to meet the requirements of heat dissipation energy consumption and heat dissipation effect. The rotor structure of this invention features an integrated design of baffle 11 and blade 12, which satisfies both the structural requirement of the baffle 11 pressing down on the silicon steel and magnet at the end, and the requirements of impeller arrangement and heat dissipation airflow; the end plate achieves dual functions. The standardized end ring and impeller structure is simple, easy to process, and solves the problem of poor heat dissipation effect of rotors relying solely on natural air cooling. The rotor structure of the present invention has two end rings assembled at both ends of the rotor core, and is designed with the same uniformly distributed through holes as the rotor core, for cooling air to enter the rotor, and at the same time, after assembly, it serves to press the silicon steel sheets and magnets of the rotor core together.

[0064] The rotor structure of this invention allows the overall heat dissipation structure to rotate with the rotor, causing the cross-flow impeller to rotate accordingly. This results in air flowing out radially from inside the impeller, creating an air pressure difference inside the rotor. This allows cool air to flow rapidly through the rotor, carrying away heat. Due to the viscosity of the gas, the radial flow of air from inside the cross-flow impeller also drives airflow on the outer circumference of the rotor, ensuring a continuous flow of cool air across the rotor's outer surface. This creates airflow between the rotor's outer surface and inner bore, providing comprehensive cooling for the rotor and efficiently removing heat from the rotor's silicon steel sheets and magnets or permanent magnets, thus achieving the cooling objective. The rotor's efficient heat dissipation is achieved through the cross-flow impeller of the heat dissipation ring, which rotates with the rotor, avoiding heat dissipation failure issues caused by the malfunction of a separate heat dissipation system. This also eliminates the problem of high-temperature demagnetization of the magnets. The overall rotor heat dissipation structure generates an air pressure difference as the rotor rotates, allowing cool air to flow rapidly through the rotor's interior and outer surface, thus carrying away heat from the rotor and magnets. The integrated design of the cross-flow impeller and end plate ensures efficient heat dissipation while maintaining impeller assembly reliability. For the same performance output, the efficient heat dissipation reduces the amount of magnets and silicon steel used, thereby improving market competitiveness.

[0065] The present invention also provides an electric motor, characterized in that it includes the rotor structure described above.

[0066] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A rotor structure, characterized in that: include: The rotor core (1) includes a first core (9) and a second core (10). The first core (9) has a plurality of second through holes (8), and the second core (10) has a plurality of first through holes (5). Along the axial direction of the rotor core (1), the first core (9), the impeller (6), and the second core (10) are arranged in sequence. The impeller (6) can discharge the airflow in the first through holes (5) and the second through holes (8) along the radial direction of the rotor core (1) to the outside of the rotor core (1).

2. The rotor structure according to claim 1, characterized in that: Along the axial direction of the rotor core (1), the second through hole (8) and the first through hole (5) extend along the axial direction of the rotor core (1), a plurality of second through holes (8) are arranged circumferentially at intervals along the first core (9), a plurality of first through holes (5) are arranged circumferentially at intervals along the second core (10), and the second through holes (8) and the first through holes (5) are opposite each other.

3. The rotor structure according to claim 2, characterized in that: Magnets (2) are provided on the first iron core (9) and the second iron core (10). Along the radial direction of the rotor iron core (1), the second through hole (8) and the first through hole (5) are located on the radial inner side of the magnet (2).

4. The rotor structure according to claim 2, characterized in that: The first iron core (9) has an end ring (3) at the end facing away from the impeller (6), and the second iron core has an end ring (3) at the end facing away from the impeller (6).

5. The rotor structure according to claim 4, characterized in that: The end ring (3) is provided with a plurality of third through holes (7), and the third through holes (7) are arranged in a one-to-one correspondence with the first through holes (5).

6. The rotor structure according to claim 2, characterized in that: The impeller (6) includes two baffles (11) and blades (12). The blades (12) are located between the two baffles (11). The baffles (11) are provided with a plurality of fourth through holes, which are arranged in a one-to-one correspondence with the first through holes (5).

7. The rotor structure according to claim 6, characterized in that: Along the radial direction of the rotor core (1), the blade (12) is located radially outside the fourth through hole.

8. The rotor structure according to claim 6, characterized in that: The blade (12) is a cross-flow blade.

9. The rotor structure according to claim 1, characterized in that: It also includes a rotating shaft (4), along the axial direction of the rotor core, the first core (9), the impeller (6) and the second core (10) are sequentially sleeved on the rotating shaft (4).

10. An electric motor, characterized in that: The rotor structure includes any one of claims 1-9.

Images