Multi-wind-path super-high-voltage motor rotor and cooling method thereof

Abstract

This invention belongs to the field of ultra-high voltage motor technology and discloses a multi-airflow ultra-high voltage motor rotor and its cooling method. It includes rotor slot wedges and rotor coils sequentially arranged within a circumferential groove on the outer surface of the rotor core. An axial through hole is provided between the center of the rotor core and the rotor coils. Multiple core ventilation channels are opened on both sides of the rotor coils. Slot wedge ventilation channels are opened on both sides of the rotor slot wedges. Core grooves are provided on both sides of the rotor core grooves. These ventilation structures are interconnected to form a comprehensive airflow path, which, combined with the through hole, achieves cooling. This structure significantly improves heat dissipation efficiency, reduces the overall rotor temperature and makes it more uniform, reduces unbalanced electromagnetic forces caused by thermal deformation, and suppresses mechanical vibration. The stable flow of the cooling airflow also prevents a vicious cycle of deteriorating heat dissipation and increased vibration, thereby extending the life of insulation materials, improving motor operational reliability, reducing the risk of sudden shutdown, and expanding its applicability in high-end equipment fields.

Description

Technical Field

[0001] This invention belongs to the field of ultra-high voltage motor technology, and particularly relates to an ultra-high voltage motor rotor with multiple air paths and its cooling method. Background Technology

[0002] Ultra-high voltage (UHV) motors typically refer to motors with rated voltages between 3.3 kV and 35 kV. With their outstanding advantages such as high power density and low transmission losses, UHV motors have become indispensable core power devices in high-end equipment manufacturing, widely used in key industries such as wind power generation, ship propulsion, and mining machinery. As these high-end equipment develops towards larger scale and higher efficiency, higher requirements are placed on the operational reliability and stability of UHV motors, further highlighting their core supporting role in the industrial chain.

[0003] However, existing ultra-high voltage motors have long faced the dual technical challenges of low rotor coil heat dissipation efficiency and increased vibration. Regarding heat dissipation, the skin effect and proximity effect caused by the alternating current in the stator windings lead to a continuous increase in the surface temperature of the rotor core, with the temperature in the central region of the rotor windings significantly higher than the surface. Traditional radial ventilation groove structures, due to limitations in their design principles, have fundamentally insufficient heat dissipation capacity, failing to effectively remove heat from the deep layers of the rotor. Sustained high temperatures accelerate the aging of insulation materials, even causing insulation failure, and may ultimately lead to the burnout of the entire machine. Regarding vibration, the unbalanced electromagnetic force generated by the thermal deformation of the rotor disrupts the dynamic stability of the conductors, exacerbating mechanical vibration. This vibration further interferes with the normal flow of cooling airflow within the rotor, creating a vicious cycle of worsened heat dissipation—increased temperature rise—intensified vibration. The synergistic effect of these heat dissipation and vibration problems significantly shortens the service life of ultra-high voltage motors, significantly increases the risk of sudden shutdowns, and severely restricts their reliable application in high-end equipment.

[0004] It is evident that the existing ultra-high voltage motor rotor structure suffers from a combined problem of low heat dissipation efficiency and increased vibration. Summary of the Invention

[0005] This invention provides a multi-airflow ultra-high voltage motor rotor and its cooling method. The multi-airflow ultra-high voltage motor rotor structure can solve the combined problems of low heat dissipation efficiency and increased vibration in existing ultra-high voltage motor rotor structures.

[0006] To achieve the above objectives, the present invention employs the following technical content: A multi-airflow ultra-high voltage motor rotor, comprising a rotor core; The outer surface of the rotor core is provided with multiple grooves along the circumferential direction; The groove contains a rotor slot wedge and a rotor coil sequentially inserted along the direction pointing towards the center of the rotor core. A through hole is provided between the center of the rotor core and the end of the rotor coil near the center of the rotor core, and the through hole is provided along the axial direction of the rotor core. Multiple core ventilation channels are respectively opened on both sides of the rotor coil; The rotor slot wedge has ventilation channels on both sides of one end near the outer surface of the rotor core. The rotor core has core grooves on both sides of the groove on its outer surface; The corresponding core ventilation duct and slot wedge ventilation duct are connected to the core groove to form an air passage. The air passage and the through hole are combined to cool the rotor core surface and rotor slot wedge simultaneously.

[0007] Furthermore, the through hole includes a first rotor arched air duct and a second rotor arched air duct; along the direction of the rotor core end face, the first rotor arched air duct is distributed on the end point of the rotor core; multiple second rotor arched air ducts are evenly distributed between the two first rotor arched air ducts corresponding to the two end points.

[0008] Furthermore, the first rotor arched air duct and the second rotor arched air duct are 7°~9° apart; the two adjacent second rotor arched air ducts are 7°~9° apart. The arch shape of the first rotor arched air duct has the same radial height at both ends of the rotor core as the second rotor arched air duct at both ends of the rotor core. The distance from the highest point of the first rotor arched air duct to the inner side of the rotor coil in the radial direction is twice that from the highest point of the second rotor arched air duct to the inner side of the rotor coil in the radial direction.

[0009] Furthermore, the core ventilation duct includes a first spiral ventilation duct and a second spiral ventilation duct; Multiple first spiral ventilation ducts and multiple second spiral ventilation ducts are arranged in rows on the left and right sides; The number of the first spiral ventilation ducts and the number of the second spiral ventilation ducts are the same; and the distance between two adjacent first spiral ventilation ducts is equal to the distance between two adjacent second spiral ventilation ducts.

[0010] Furthermore, the first spiral ventilation duct and the second spiral ventilation duct are arranged alternately in the axial direction.

[0011] Furthermore, the slotted wedge ventilation channel includes a first slotted wedge ventilation channel and a second slotted wedge ventilation channel; Multiple first-slot wedge ventilation channels and multiple second-slot wedge ventilation channels are arranged in rows on the left and right sides; The first and second slotted wedge ventilation channels are arranged alternately along the axial direction; The first slotted wedge ventilation duct is connected to the first spiral ventilation duct; the second slotted wedge ventilation duct is connected to the second spiral ventilation duct.

[0012] Furthermore, the core groove includes a first core groove and a second core groove; Multiple first core grooves and multiple second core grooves are arranged in rows on the left and right sides; The first core groove and the second core groove are arranged alternately along the axial direction; The first core groove is connected to the first slot wedge ventilation channel; the second core groove is connected to the second slot wedge ventilation channel.

[0013] Furthermore, the rotor coil adopts a racetrack-shaped coil, with opposite currents flowing through the left rotor winding and the right rotor winding to form a pair of magnetic poles.

[0014] Furthermore, the rotor slot wedge is a magnetic slot wedge.

[0015] A cooling method for a multi-airflow ultra-high voltage motor rotor, based on the aforementioned multi-airflow ultra-high voltage motor rotor, includes: During the operation of the ultra-high voltage motor rotor, the airflow is formed by the connection between the slot wedge ventilation channel and the iron core groove, so that the air flows from the slot wedge ventilation channel into the iron core groove to reduce the temperature of the rotor iron core surface. The airflow path formed by the core ventilation channel and the slot wedge ventilation channel allows air to flow from the core ventilation channel to the slot wedge ventilation channel, thereby reducing the temperature of the rotor slot wedge. By combining through holes and air passages, the surface of the rotor core and the rotor slot wedges are cooled simultaneously.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a multi-airflow ultra-high voltage motor rotor, comprising rotor slot wedges and rotor coils sequentially arranged within a circumferential groove on the outer surface of the rotor core. An axial through-hole is provided between the center of the rotor core and the rotor coils. Multiple core ventilation channels are formed on both sides of the rotor coils. Slot wedge ventilation channels are formed on both sides of the rotor slot wedges. Core grooves are formed on both sides of the rotor core grooves. These ventilation structures are interconnected to form a comprehensive airflow path, which, combined with the through-hole, achieves cooling. This rotor, through the synergistic effect of multiple airflow paths—core ventilation channels, slot wedge ventilation channels, core grooves, and the axial through-hole—guides cooling airflow deep into the rotor interior, directly acting on the deep coil region and the slot wedge surface, effectively overcoming heat accumulation caused by the skin effect and proximity effect. Simultaneously, the through-hole enhances axial airflow circulation, promoting uniform heat dissipation from the center to the surface and preventing the formation of localized high-temperature points. As a result, heat dissipation efficiency is significantly improved, the overall rotor temperature is reduced and more evenly distributed, the unbalanced electromagnetic force caused by thermal deformation is reduced, and mechanical vibration is suppressed. The stable flow of cooling air also prevents the vicious cycle of heat dissipation deterioration and vibration aggravation, thereby extending the life of insulation materials, improving the reliability of motor operation, reducing the risk of sudden shutdown, and expanding its applicability in the field of high-end equipment.

[0017] Preferably, in this invention, the through-hole is optimized into a first rotor arched air duct distributed at both ends and a second rotor arched air duct evenly distributed, enhancing the cooling intensity of the rotor end region. The end-point air duct layout concentrates heat dissipation in the high-heat area of ​​the rotor core end face, while the evenly distributed air ducts in the middle ensure axial temperature uniformity. This structure effectively alleviates localized high temperatures caused by insufficient end heat dissipation, reduces differences in thermal deformation gradients, weakens unbalanced electromagnetic forces at their source, and improves the dynamic stability of the rotor.

[0018] Preferably, this invention specifically provides two types of arched air duct angle differences and radial height differences, doubling the depth of the first rotor's arched air duct. This design allows the end-point air duct to penetrate deep into the rotor's high-temperature core area, enhancing the directional extraction of deep heat; the uniform angle distribution optimizes airflow coverage uniformity, avoiding cooling blind spots. The depth-differentiated air ducts synergistically suppress overheating in the winding center region, significantly improve the uniformity of temperature field distribution, reduce the risk of thermal stress concentration, and further suppress vibration sources.

[0019] Preferably, in this invention, the first and second spiral ventilation channels are arranged symmetrically to increase the contact area and path between the airflow and the side of the rotor coil. The spiral structure prolongs the airflow residence time, enhances forced convection heat dissipation in the lateral region of the winding, and specifically solves the problem of surface heat accumulation caused by the skin effect. The symmetrical layout avoids thermal deformation and skewing caused by uneven heat dissipation on one side, and improves heat dissipation symmetry and mechanical balance.

[0020] Preferably, in this invention, the spiral ventilation ducts are arranged alternately along the axial direction to form an interlaced air network. This alternating arrangement creates a continuous and uniform heat dissipation interface for the cooling airflow along the rotor's axial direction, eliminating the temperature discontinuity phenomenon of traditional parallel air ducts. This design achieves uniform axial heat diffusion, prevents excessive local temperature rise, reduces the probability of axial thermal deformation, and ensures the overall structural stability of the rotor.

[0021] Preferably, in this invention, the slot wedge ventilation duct and the spiral ventilation duct are axially alternately connected to form a layered airflow guiding system. This alternating connection allows airflow to be conducted in a stepped manner from the deep spiral ventilation duct to the surface slot wedge ventilation duct, achieving directional heat migration from the inside out. This structure overcomes the traditional heat dissipation blind spot, directly cooling the high-heat area at the junction of the slot wedge and the coil, while avoiding airflow short-circuiting and improving the utilization rate of the cooling medium.

[0022] Preferably, in this invention, the core grooves and slot wedge ventilation channels are alternately connected to form surface heat dissipation channels. This alternating arrangement ensures that the cooling airflow evenly covers the rotor core surface, quickly dissipating surface heat; combined with deep airflow paths, it forms synergistic internal and external heat dissipation, optimizing overall thermal balance. This design maintains unobstructed airflow, ensuring uniform airflow distribution even during vibration, and preventing vibration from interfering with heat dissipation.

[0023] Preferably, in this invention, a magnetic slot wedge is used to optimize the magnetic circuit distribution. The magnetic material reduces leakage magnetic loss at the slot opening, thereby reducing additional heat sources; at the same time, it homogenizes the air gap magnetic flux density, weakening vibration harmonics caused by magnetic field distortion. This design synergistically reduces heat load and electromagnetic vibration amplitude, enhancing the synergistic suppression effect of heat dissipation and vibration.

[0024] This invention also provides a control method for a multi-airflow ultra-high voltage motor rotor. Based on the aforementioned multi-airflow ultra-high voltage motor rotor, this method forms a surface airflow path by connecting the slot wedge ventilation channel with the core groove, guiding airflow to cool the rotor core surface; simultaneously, it utilizes the connection between the core ventilation channel and the slot wedge ventilation channel to form an internal airflow path, guiding airflow into the slot wedge region; and then, combined with the overall airflow system established by the axial through-hole, it achieves synergistic cooling of the rotor core surface and rotor slot wedges. This method employs a graded airflow design: the surface airflow path directly scours the core groove, quickly dissipating surface heat; the internal airflow path penetrates the coil side and slot wedges, specifically cooling traditional heat dissipation blind spots (especially the deep high-heat areas of the winding); and the through-hole forms the main axial airflow channel, enhancing the penetration and circulation efficiency of the cooling medium inside the rotor, forcing heat to migrate directionally from the high-temperature center to the low-temperature surface. As a result, the overall improvement in heat dissipation efficiency significantly reduces the overall operating temperature of the rotor, effectively suppressing the risk of insulation aging caused by local overheating. At the same time, the uniform temperature distribution reduces the unbalanced electromagnetic force caused by thermal deformation, weakens the mechanical vibration amplitude from the source, avoids vibration interference with the airflow, and completely breaks the vicious cycle of "deteriorating heat dissipation - increased temperature rise - enhanced vibration", thereby greatly extending the service life of the motor and ensuring operational reliability in high-end application scenarios. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a multi-airflow ultra-high voltage motor rotor provided in an embodiment of the present invention; Figure 2 A front view of the rotor core of a multi-airflow ultra-high voltage motor rotor provided in an embodiment of the present invention; Figure 3 for Figure 2 AA-direction two-dimensional cross-section; Figure 4 for Figure 2 BB-directed two-dimensional cross-section; Figure 5 A side view of the rotor coil of a multi-airflow ultra-high voltage motor rotor provided in an embodiment of the present invention; Figure 6 A top view of the rotor coil of a multi-airflow ultra-high voltage motor rotor provided in an embodiment of the present invention; Figure 7 A front view of the rotor slot wedge of a multi-airflow ultra-high voltage motor rotor provided in an embodiment of the present invention; Figure 8 A cross-sectional view of the rotor of an ultra-high voltage motor with multiple air paths and a first slotted wedge ventilation duct; Figure 9 for Figure 8 A magnified view of a portion of point I; Figure 10 A cross-sectional view of the rotor of an ultra-high voltage motor with multiple air paths and a second slotted wedge ventilation duct; Figure 11 for Figure 10 A magnified view of section II.

[0026] Figure label: 1. Rotor core; 2. Rotor slot wedge; 3. Rotor coil; 4. First rotor arched air duct; 5. Second rotor arched air duct; 6. First spiral ventilation duct; 7. Second spiral ventilation duct; 8. First slot wedge ventilation duct; 9. Second slot wedge ventilation duct; 10. First core groove; 11. Second core groove. Detailed Implementation

[0027] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] As mentioned in the background section, the unbalanced electromagnetic force generated by the rotor's thermal deformation disrupts the dynamic stability of the conductor, leading to increased mechanical vibration. This vibration further interferes with the normal flow of cooling airflow within the rotor, creating a vicious cycle of worsened heat dissipation—increased temperature rise—intensified vibration. The combined effect of these two factors significantly shortens the equipment's lifespan and substantially increases the risk of sudden shutdowns. This severely damages the overall operational stability and expected lifespan of the motor.

[0032] To address the aforementioned issues, this embodiment provides a multi-airflow ultra-high voltage motor rotor. This ultra-high voltage motor rotor structure features simple assembly, convenient installation, and easy maintenance, and can effectively cool its rotor core and rotor slot wedges.

[0033] like Figure 1 As shown, this embodiment provides a multi-airflow ultra-high voltage motor rotor, including a rotor core 1. Multiple grooves are formed on the outer surface of the rotor core 1 along the circumferential direction. Rotor slot wedges 2 and rotor coils 3 are sequentially inserted into the grooves along the direction pointing towards the center of the rotor core 1. The rotor slot wedges 2 are located on the outer side of the rotor coils 3 in the radial direction.

[0034] In this embodiment, as Figure 3 and Figure 4 As shown, a through hole is provided between the center of the rotor core 1 and the end of the rotor coil 3 near the center of the rotor core 1, and the through hole is opened along the axial direction of the rotor core 1. The through hole specifically includes a first rotor arched air duct 4 and a second rotor arched air duct 5, both of which are located between the rotor coil 3 and the rotor core 1 in the radial direction.

[0035] Combination Figure 2 As shown, along the end face of the rotor core 1, the first rotor arched air duct 4 is distributed on the end point of the rotor core 1. In this embodiment, there are four first rotor arched air ducts 4, two on each side. Multiple second rotor arched air ducts 5 are evenly distributed between the two first rotor arched air ducts 4 corresponding to the two end points. There are a total of twenty-eight second rotor arched air ducts 5, fourteen on each side. The fourteen second rotor arched air ducts 5 on the left side are located between the upper and lower first rotor arched air ducts 4, and the fourteen second rotor arched air ducts 5 on the right side are also located between the upper and lower first rotor arched air ducts 4.

[0036] For example, the first rotor arched air duct 4 and the adjacent second rotor arched air duct 5 differ by 8 degrees in the circumferential direction (within the range of 7° to 9° as defined in the claims), and the two adjacent second rotor arched air ducts 5 also differ by 8 degrees in the circumferential direction (within the range of 7° to 9° as defined in the claims); and the arch of the first rotor arched air duct 4 has the same radial height at both ends of the rotor core 1 as the second rotor arched air duct 5 at both ends of the rotor core 1, both being 50mm, while the highest point of the arch of the first rotor arched air duct 4 is at the same distance from the rotor line. The distance between the inner side of the first rotor's arched air duct 4 and the rotor coil in the radial direction is 25mm. The distance between the highest point of the second rotor's arched air duct 5 and the inner side of the rotor coil in the radial direction is 12.5mm. That is, the distance between the highest point of the first rotor's arched air duct 4 and the inner side of the rotor coil in the radial direction is twice that of the highest point of the second rotor's arched air duct 5 and the inner side of the rotor coil in the radial direction. This structural arrangement can reasonably optimize the ventilation path, balance the air volume from the middle to the end area of ​​the rotor, achieve uniform air volume distribution, thereby reducing ventilation loss and lowering the rotor core temperature.

[0037] like Figure 5 and Figure 6 As shown in this embodiment, multiple core ventilation channels are respectively opened on both sides of the rotor coil 3. The core ventilation channels specifically include a first spiral ventilation channel 6 and a second spiral ventilation channel 7. The multiple first spiral ventilation channels 6 and the multiple second spiral ventilation channels 7 are arranged in rows on the left and right, and the first spiral ventilation channel 6 is always located to the left of the circumferential position of the second spiral ventilation channel 7. The number of first spiral ventilation channels 6 and second spiral ventilation channels 7 is the same, and the distance between two adjacent first spiral ventilation channels 6 is equal to the distance between two adjacent second spiral ventilation channels 7, which can effectively increase the heat dissipation area and reduce the rotor winding temperature. At the same time, the first spiral ventilation channels 6 and the second spiral ventilation channels 7 are arranged alternately in the axial direction.

[0038] Combination Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11The rotor slot wedge 2 has slot wedge ventilation channels on both sides of one end near the outer surface of the rotor core 1. The slot wedge ventilation channels include a first slot wedge ventilation channel 8 and a second slot wedge ventilation channel 9. Multiple first slot wedge ventilation channels 8 and multiple second slot wedge ventilation channels 9 are arranged in rows on the left and right sides. The first slot wedge ventilation channel 8 is always located on the left side of the circumferential position of the second slot wedge ventilation channel 9. The first slot wedge ventilation channel 8 and the second slot wedge ventilation channel 9 are arranged alternately along the axial direction. The first slot wedge ventilation channel 8 is connected to the first spiral ventilation channel 6, and the second slot wedge ventilation channel 9 is connected to the second spiral ventilation channel 7. This allows air to flow from the first spiral ventilation channel 6 to the first slot wedge ventilation channel 8, and at the same time, air can flow from the second spiral ventilation channel 7 to the second slot wedge ventilation channel 9, thereby reducing the temperature of the rotor slot wedge 2.

[0039] In this embodiment, core grooves are respectively formed on both sides of the groove on the outer surface of the rotor core 1. The core grooves include first core grooves 10 and second core grooves 11. Multiple first core grooves 10 and multiple second core grooves 11 are arranged in rows on both sides, and the first core grooves 10 and second core grooves 11 are alternately arranged along the axial direction. The first core grooves 10 are connected to the first slot wedge ventilation channel 8, and the second core grooves 11 are connected to the second slot wedge ventilation channel 9, so that the air can flow from the first slot wedge ventilation channel 8 to the first core groove 10, and at the same time, the air can flow from the second slot wedge ventilation channel 9 to the second core groove 11, thereby reducing the surface temperature of the rotor core 1. Through the air channels formed by the connection between the corresponding core ventilation channels, slot wedge ventilation channels and core grooves, combined with the through holes, the surface of the rotor core 1 and the rotor slot wedges 2 can be cooled simultaneously.

[0040] As another preferred embodiment, the rotor coil 3 adopts a racetrack-shaped coil, and the rotor winding on the left side and the rotor winding on the right side are supplied with opposite currents to form a pair of magnetic poles; the rotor slot wedge 2 adopts a magnetic slot wedge. The use of magnetic slot wedges is conducive to the uniform distribution of the air gap magnetic field, which can reduce harmonics and thus reduce the vibration of the motor. At the same time, the overall assembly is simple and the later maintenance is convenient.

[0041] Therefore, this embodiment provides a multi-airflow ultra-high voltage motor rotor, which has the following advantages: This ultra-high voltage motor rotor is simple to assemble and easy to maintain; it can also reduce the surface temperature of the rotor core and the temperature of the rotor windings. In addition, the rotor of this ultra-high voltage motor can effectively reduce vibration, thereby extending the service life of the motor.

[0042] Based on the above-mentioned multi-airflow ultra-high voltage motor rotor, this embodiment also provides a cooling method for the multi-airflow ultra-high voltage motor rotor, the specific steps of which are as follows: During the operation of the ultra-high voltage motor rotor, the airflow paths formed by the first slot wedge ventilation channel 8 communicating with the first core groove 10 and the second slot wedge ventilation channel 9 communicating with the second core groove 11 allow air to flow from the first slot wedge ventilation channel 8 to the first core groove 10 and from the second slot wedge ventilation channel 9 to the second core groove 11, thereby reducing the temperature of the rotor core 1 surface. The airflow paths formed by the first spiral ventilation channel 6 communicating with the first slot wedge ventilation channel 8 and the second spiral ventilation channel 7 communicating with the second slot wedge ventilation channel 9 allow air to flow from the first spiral ventilation channel 6 to the first slot wedge ventilation channel 8 and from the second spiral ventilation channel 7 to the second slot wedge ventilation channel 9, thereby reducing the temperature of the rotor slot wedge 2. Finally, the through hole formed by the first rotor arched air channel 4 and the second rotor arched air channel 5, along with the above two airflow paths, achieves simultaneous cooling of the rotor core 1 surface and the rotor slot wedge 2, ensuring uniform and efficient cooling and reducing ventilation losses.

[0043] In summary, the multi-airflow ultra-high voltage motor rotor and its cooling method provided by this invention have the following advantages compared with existing multi-airflow ultra-high voltage motor rotors: This invention utilizes a three-dimensional airflow network constructed by layering rotor slot wedges and rotor coils within the rotor core grooves, combined with axial through holes and interconnected spiral ventilation channels, slot wedge ventilation channels, and core grooves. Racetrack-shaped coils and magnetic slot wedges optimize electromagnetic characteristics. The cooling method achieves surface cooling by connecting the slot wedge ventilation channels with the core grooves, while simultaneously utilizing the spiral ventilation channels to form an internal airflow path. This, combined with the axial through holes, enables multi-stage airflow circulation. This design overcomes traditional heat dissipation limitations: the three-dimensional airflow forces the cooling medium deep into the high-temperature core area of ​​the rotor, specifically dissipating deep heat from the windings; the alternating spiral and slot wedge ventilation channels extend the airflow contact path, strengthening forced convection on the coil sides and at the slot wedge junction; and the differentiated design of the arched through holes enhances end heat dissipation intensity and ensures axial temperature uniformity. The rotor structure of this motor can significantly reduce the overall operating temperature of the rotor and the temperature difference between the inside and outside of the winding, effectively blocking the risk of insulation aging; the uniform heat distribution greatly weakens the unbalanced electromagnetic force caused by thermal deformation, suppresses the amplitude of mechanical vibration, and completely breaks the vicious cycle of heat dissipation deterioration-temperature rise-vibration enhancement, thereby extending the service life of the motor and improving the operational reliability and safety in high-end application scenarios.

[0044] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A multi-airflow ultra-high voltage motor rotor, characterized in that, Including the rotor core (1); The outer surface of the rotor core (1) is provided with multiple grooves along the circumferential direction; The groove is provided with a rotor slot wedge (2) and a rotor coil (3) inserted sequentially along the direction pointing to the center of the rotor core (1); A through hole is provided between the center of the rotor core (1) and one end of the rotor coil (3) near the center of the rotor core (1), and the through hole is provided along the axial direction of the rotor core (1). Multiple core ventilation channels are respectively opened on both sides of the rotor coil (3); The rotor slot wedge (2) has slot wedge ventilation channels on both sides of one end near the outer surface of the rotor core (1); The rotor core (1) has core grooves on both sides of the groove on its outer surface; The corresponding side of the core ventilation channel and slot wedge ventilation channel are connected to the core groove to form an air path. The air path and the through hole are combined to cool the surface of the rotor core (1) and the rotor slot wedge (2) at the same time.

2. The multi-airflow ultra-high voltage motor rotor according to claim 1, characterized in that, The through hole includes a first rotor arched air duct (4) and a second rotor arched air duct (5); along the end face direction of the rotor core (1), the first rotor arched air duct (4) is distributed on the end point of the rotor core (1); multiple second rotor arched air ducts (5) are evenly distributed between the two first rotor arched air ducts (4) corresponding to the two end points.

3. The multi-airflow ultra-high voltage motor rotor according to claim 2, characterized in that, The first rotor arched air duct (4) and the second rotor arched air duct (5) are 7°~9° apart; the two adjacent second rotor arched air ducts (5) are 7°~9° apart. The arch of the first rotor arched air duct (4) is at the same radial height at both ends of the rotor core (1) as the second rotor arched air duct (5) at both ends of the rotor core; The distance from the highest point of the first rotor arched air duct (4) to the inner side of the rotor coil in the radial direction is twice that from the highest point of the second rotor arched air duct (5) to the inner side of the rotor coil in the radial direction.

4. The multi-airflow ultra-high voltage motor rotor according to claim 1, characterized in that, The core ventilation duct includes a first spiral ventilation duct (6) and a second spiral ventilation duct (7); Multiple first spiral ventilation ducts (6) and multiple second spiral ventilation ducts (7) are arranged in rows on the left and right; The number of the first spiral ventilation duct (6) and the second spiral ventilation duct (7) are the same; and the distance between two adjacent first spiral ventilation ducts (6) is equal to the distance between two adjacent second spiral ventilation ducts (7).

5. A multi-airflow ultra-high voltage motor rotor according to claim 4, characterized in that, The first spiral ventilation duct (6) and the second spiral ventilation duct (7) are arranged alternately in the axial direction.

6. The multi-airflow ultra-high voltage motor rotor according to claim 5, characterized in that, The slotted wedge ventilation channel includes a first slotted wedge ventilation channel (8) and a second slotted wedge ventilation channel (9); Multiple first-slot wedge ventilation channels (8) and multiple second-slot wedge ventilation channels (9) are arranged in rows on the left and right; The first slotted wedge ventilation channel (8) and the second slotted wedge ventilation channel (9) are arranged alternately along the axial direction; The first slotted wedge ventilation duct (8) is connected to the first spiral ventilation duct (6); the second slotted wedge ventilation duct (9) is connected to the second spiral ventilation duct (7).

7. The ultra-high voltage motor rotor with multiple airflow paths according to claim 5, characterized in that, The core groove includes a first core groove (10) and a second core groove (11). Multiple first core grooves (10) and multiple second core grooves (11) are arranged in rows on the left and right sides; The first core groove (10) and the second core groove (11) are arranged alternately along the axial direction; The first core groove (10) is connected to the first slot wedge ventilation channel (8); the second core groove (11) is connected to the second slot wedge ventilation channel (9).

8. The ultra-high voltage motor rotor with multiple airflow paths according to claim 1, characterized in that, The rotor coil (3) adopts a racetrack-shaped coil, and the rotor winding on the left side and the rotor winding on the right side are supplied with opposite currents to form a pair of magnetic poles.

9. A multi-airflow ultra-high voltage motor rotor according to claim 1, characterized in that, The rotor slot wedge (2) is a magnetic slot wedge.

10. A cooling method for a multi-airflow ultra-high voltage motor rotor, based on the multi-airflow ultra-high voltage motor rotor according to any one of claims 1-9, characterized in that, include: During the operation of the ultra-high voltage motor rotor, the airflow is formed by the connection between the slot wedge ventilation channel and the iron core groove, so that the air flows from the slot wedge ventilation channel into the iron core groove to reduce the temperature of the rotor iron core (1). The airflow formed by the core ventilation channel and the slot wedge ventilation channel allows air to flow from the core ventilation channel to the slot wedge ventilation channel in order to reduce the temperature of the rotor slot wedge (2). By combining the through hole and the air passage, the surface of the rotor core (1) and the rotor slot wedge (2) are cooled simultaneously.

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