An electric machine assembly and a rotating machine

Abstract

The utility model provides a kind of motor assembly and rotating machinery, motor assembly includes: rotating shaft and rotor core, rotating shaft is hollow shaft, with hollow runner, hollow runner can flow heat dissipation fluid, rotor core is sleeved on the outer periphery of rotating shaft, first flow channel is set up on rotating shaft, one end of first flow channel and hollow runner flow, the other end extends to the outer periphery wall of rotating shaft, second flow channel is set up on rotor core, one end of second flow channel is located at the radial inner periphery wall of rotor core and opposite and communicate with first flow channel, the other end of second flow channel extends towards the direction of the inside of rotor core. According to the utility model, the inside of rotor core and rotating shaft can be cooled and cooled effectively, and the cooling effect of rotor core and rotating shaft is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a motor assembly and rotating machinery. Background Technology

[0002] For existing high-speed motor components, there are requirements for increased motor power and overall speed. Under these requirements, the overall temperature rise needs further optimization. In particular, the stator core during high-speed operation is limited by cooling conditions and the heat dissipation environment, and its operating temperature is often the highest inside the motor, resulting in decreased motor efficiency and concentrated temperature rise points in the entire machine.

[0003] In existing high-speed air-bearing rotor systems, the temperatures of the thrust bearings and axial bearings often exceed preset temperatures, posing a significant challenge to the bearing's elastic structure and surface wear-resistant coating. Similarly, for the rotor, the concentrated heat generation area leads to uneven heating of the entire shaft, resulting in regional deformation and affecting the safe operation of the entire shaft. Simultaneously, insufficient heat dissipation in the permanent magnets causes internal heat accumulation, resulting in excessively high temperatures that reduce overall machine performance and pose a risk of runaway.

[0004] In summary, the cooling structure requiring a technical solution suffers from problems such as being affected by the temperature of the cooling medium itself, difficulty in cooling multiple heat points of the entire machine due to the design of the cooling channels, and performance impact due to improper design, resulting in poor cooling and heat dissipation performance of the rotor core.

[0005] Because existing high-speed motor assemblies suffer from poor heat dissipation for the rotor core, this invention researches and designs a motor assembly and rotating machinery. Utility Model Content

[0006] Therefore, the technical problem to be solved by this utility model is to overcome the defect of poor heat dissipation effect on the rotor core in the existing high-speed motor assembly, thereby providing a motor assembly and rotating machinery.

[0007] To address the above problems, this utility model provides a motor assembly, comprising: The rotating shaft and rotor core are provided. The rotating shaft is a hollow shaft with a hollow flow channel through which heat dissipation fluid can flow. The rotor core is sleeved on the outer periphery of the rotating shaft. A first flow channel is provided on the rotating shaft. One end of the first flow channel flows through the hollow flow channel, and the other end extends to the outer peripheral wall of the rotating shaft. A second flow channel is provided on the rotor core. One end of the second flow channel is located at the radial inner peripheral wall of the rotor core and is opposite to and communicates with the first flow channel. The other end of the second flow channel extends toward the interior of the rotor core.

[0008] In some implementations... The rotor core is also provided with a third flow channel, which extends from one axial end of the rotor core to the other axial end of the rotor core, and the third flow channel is connected to the second flow channel.

[0009] In some implementations... The other end of the second flow channel is located inside the rotor core and is spaced from the outer peripheral wall of the rotor core by a preset distance greater than 0. The third flow channel is connected to and communicates with the other end of the second flow channel.

[0010] In some implementations... The first flow channel has multiple channels, and the multiple first flow channels are spaced apart along the axial direction of the rotating shaft; It also includes a fourth flow channel, one end of which is located at the radial inner peripheral wall of the rotor core and is opposite to and connected to the first flow channel, and the other end of the fourth flow channel extends toward the interior of the rotor core, and the extension length of the fourth flow channel is greater than the extension length of the second flow channel.

[0011] In some implementations... It also includes a fifth flow channel, which is located inside the rotor core. One end of the fifth flow channel is located at one axial end of the rotor core or at the outer peripheral wall of the rotor core, and the other end of the fifth flow channel is located at the other axial end of the rotor core or at the outer peripheral wall of the rotor core. The fifth flow channel is connected to the fourth flow channel.

[0012] In some implementations... The other end of the fourth flow channel is located inside the rotor core and is spaced from the outer peripheral wall of the rotor core by a preset distance greater than 0. The fifth flow channel is connected to and communicates with the other end of the fourth flow channel. When a third flow channel is also included, the fourth flow channel is also connected to and communicates with the third flow channel.

[0013] In some implementations... The rotor core is also provided with a sixth flow channel. One end of the sixth flow channel is connected to the fifth flow channel, and the other end of the sixth flow channel is located at the outer peripheral wall of the rotor core, so that the gas after the rotor core is cooled can be discharged through the sixth flow channel.

[0014] In some implementations... A rotating fan assembly is provided in the hollow flow channel of the rotating shaft. The rotating fan assembly is fixed to the rotating shaft so that it can rotate as a whole with the rotating shaft. The rotating fan assembly can drive gas to be drawn from the outside of the rotating shaft into the hollow flow channel and discharged from the first flow channel into the interior of the rotor core.

[0015] In some implementations... Along the radial direction of the rotating shaft, the rotating fan assembly is positioned opposite to the rotor core. The rotating shaft is provided with a first air intake and a second air intake. Both the first air intake and the second air intake can draw in gas from outside the rotating shaft and enter the hollow flow channel. The first air intake is located on one axial side of the rotor core, and the second air intake is located on the other axial side of the rotor core, so that the rotor core is located between the first air intake and the second air intake. The rotating fan assembly is a dual-suction fan, capable of drawing in gas from both sides of its axial direction and discharging it through the first flow channel.

[0016] In some implementations... It also includes a motor stator, which is located on the radial outer periphery of the rotor core. The motor stator includes a stator core and a stator winding. One end of the fifth flow channel is opposite to the stator winding at one axial end of the stator core, and the other end of the fifth flow channel is opposite to the stator winding at the other axial end of the stator core.

[0017] In some implementations... It also includes a motor housing, which is located on the outer periphery of the stator core, and the motor housing is provided with a first air outlet and a second air outlet. The first air outlet is located on the radial outer periphery of the stator winding at one axial end of the stator core, and the two are opposite each other radially. The second air outlet is located on the radial outer periphery of the stator winding at the other axial end of the stator core, and the two are opposite each other radially.

[0018] This utility model also provides a rotating machine, which includes the aforementioned motor assembly, and further includes: The motor housing includes a front cover assembly and a rear cover assembly. The front cover assembly is connected to one axial end of the motor housing, and the rear cover assembly is connected to the other axial end of the motor housing. The inner radial circumference of the front cover assembly is supported on the outer radial circumference of the rotating shaft by a first radial bearing, and the inner radial circumference of the rear cover assembly is supported on the outer radial circumference of the rotating shaft by a second radial bearing. When the rotating shaft is provided with a first air intake and a second air intake, The rear cover assembly has a first air intake channel on one axial side, which can communicate with the first air intake port. The front cover assembly has a second air intake channel, which can communicate with the second air intake port.

[0019] In some implementations... It also includes an axial bearing assembly located on the axial side of the rear end cover assembly that is relatively away from the rotor core, and a first gap flow channel is provided between the axial bearing assembly and the rear end cover assembly. The radially outer end of the first gap flow channel is connected to the first intake channel, and the radially inner end of the first gap flow channel is opposite to and connected to the first intake port. It also includes a first-stage diffuser located on the axial side of the front end cover assembly that is relatively away from the rotor core, and a second gap flow channel is provided between the first-stage diffuser and the front end cover assembly. The radially outer end of the second gap flow channel is connected to the second intake channel, and the radially inner end of the second gap flow channel is opposite to and connected to the second intake port.

[0020] In some implementations... The first intake channel is opposite to the axial bearing assembly along the radial direction of the rotating shaft. The axial bearing assembly has an inlet channel to allow a portion of the airflow from the first intake channel to enter the interior of the axial bearing assembly. One axial end of the first gap flow channel is connected to the first radial bearing so that a portion of the airflow can be introduced from the first intake channel into the interior of the first radial bearing. One axial end of the second gap flow channel is connected to the second radial bearing so that a portion of the airflow can be introduced from the second intake channel into the interior of the second radial bearing.

[0021] The motor assembly and rotating machinery provided by this utility model have the following beneficial effects: 1. This utility model, by setting the rotating shaft of the motor assembly to a hollow shaft structure, i.e., having a hollow flow channel, allows for the introduction of a heat-dissipating fluid, such as air, into the hollow flow channel, effectively cooling the interior of the rotating shaft. Furthermore, a first flow channel is opened on the rotating shaft, and a second flow channel is opened on the rotor core, which is opposite to and connected to the first flow channel. The second flow channel allows the heat-dissipating fluid inside the hollow shaft to enter the interior of the rotor core, thereby effectively cooling the rotor core. Compared with existing motor technologies, this utility model can provide targeted heat dissipation and cooling for the interior of the rotor core and the rotating shaft, improving the cooling effect for the rotor core and the rotating shaft; effectively solving the problem of poor heat dissipation effect for the rotor core in existing high-speed motor assemblies.

[0022] 2. This utility model also utilizes a third flow channel inside the rotor core, which connects to the second flow channel to introduce gas, further increasing the cooling and heat dissipation area inside the rotor core and improving the cooling and heat dissipation effect. It also allows the cooled gas to be discharged outside the rotor core. A fourth flow channel inside the rotor core, which is opposite to and connects to the first flow channel, has a radial length longer than the second flow channel. This further targets the internal structure of the rotor core, which is relatively close to the radial outer periphery, to provide cooling and heat dissipation, further increasing the cooling and heat dissipation area and improving the cooling and heat dissipation effect. A fifth flow channel connects to the fourth flow channel, further enhancing the cooling and heat dissipation effect of the rotor core and allowing the cooled gas to be discharged outside the rotor core.

[0023] 3. Furthermore, this utility model further utilizes a structure where the fourth flow channel is connected to the third flow channel to form a network of interwoven channels, thereby increasing the cooling and heat dissipation area inside the rotor core and further improving the cooling and heat dissipation effect. Preferably, the cooled gas can be discharged through the sixth flow channel, and the sixth flow channel is radially opposite to the stator core, which can specifically cool and dissipate heat for the stator core. The two ends of the fifth flow channel of this utility model are respectively arranged opposite to the stator windings at both ends of the stator core, which can spray gas onto the windings through the fifth flow channel, thereby further effectively dissipating heat and cooling the windings and further improving the cooling effect on the motor stator.

[0024] 4. This utility model uses a rotating fan assembly installed in a hollow flow channel, which can rotate as an integral part of the shaft. As the shaft rotates, it can automatically draw gas into the hollow flow channel, providing power for cooling the shaft, rotor core, stator, etc. Preferably, the rotating fan assembly is a double-suction fan, which can draw gas from the first and second suction ports on both sides of the rotor core, and then spray it onto the rotor core for targeted cooling, further increasing the cooling gas flow rate to the shaft and rotor core, and further improving the cooling and heat dissipation effect.

[0025] 5. This utility model utilizes a first intake channel on rotating machinery, positioned opposite to the axial bearing assembly. The axial bearing assembly has an inlet channel that allows some airflow to be introduced into it for effective cooling. Furthermore, through a first gap channel, some airflow is also directed into the interior of the first radial bearing, achieving a cooling effect. Simultaneously, some airflow is introduced into the interior of the hollow shaft through the first intake port, providing targeted cooling for the shaft, rotor core, and even the stator. Additionally, through a second gap channel, some airflow is directed into the interior of the second radial bearing, achieving a cooling effect. Therefore, this utility model not only effectively cools the shaft, rotor core, and stator, but also effectively cools and dissipates heat from both the axial and radial bearings, further improving the heat dissipation performance of the motor assembly. Attached Figure Description

[0026] Figure 1 This is a longitudinal sectional view of the internal structure of the rotating machinery including the motor assembly according to this utility model. Figure 2 This is a schematic diagram of the flow path of the hollow rotating shaft of the rotating machinery of this utility model; Figure 3 This is a schematic diagram of the internal flow channel of the motor assembly of the rotating machinery of this utility model; Figure 4 yes Figure 3 A partial enlarged view of the central axis bearing assembly; Figure 5 This is a three-dimensional structural diagram of the rotating fan assembly of this utility model; Figure 6 yes Figure 3 A magnified view of the front cover component.

[0027] The reference numerals in the attached figures are as follows: 201. First-stage compressor volute; 202. First-stage compressor impeller; 203. First-stage diffuser; 204. Front end cover assembly; 205. Motor housing; 206. Motor stator; 207. Rotor core; 208. Shaft; 209. Rear end cover assembly; 210. Second-stage diffuser assembly; 211. Second-stage volute; 212. Second-stage compressor impeller; 1. First flow channel; 2. Second flow channel; 3. Third flow channel; 4. Fourth flow channel; 5. Fifth flow channel; 6. Sixth flow channel; 7. Rotating fan assembly; 8. First intake port; 9. Second intake port; 10. Hollow flow channel; 11. Stator core; 12. Stator winding; 13. First outlet port; 14. Second outlet port; 15. First radial bearing; 16. Second radial bearing; 17. First intake channel; 18. Second intake channel; 19. First gap flow channel; 20. Second gap flow channel; 21. Axial bearing assembly; 22. Thrust plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, 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 utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0031] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0032] 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.

[0033] 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 cannot be construed as limiting the scope of protection of this utility model.

[0034] like Figure 1-6 As shown, this utility model provides a motor assembly, which includes: The rotating shaft 208 is a hollow shaft with a hollow flow channel 10 through which heat dissipation fluid can flow. The rotor core 207 is sleeved on the outer periphery of the rotating shaft 208. A first flow channel 1 is provided on the rotating shaft 208. One end of the first flow channel 1 flows through the hollow flow channel 10, and the other end extends to the outer peripheral wall of the rotating shaft 208. A second flow channel 2 is provided on the rotor core 207. One end of the second flow channel 2 is located at the radial inner peripheral wall of the rotor core 207 and is opposite to and communicates with the first flow channel 1. The other end of the second flow channel 2 extends toward the interior of the rotor core 207.

[0035] This invention features a hollow shaft structure for the motor assembly's rotating shaft, providing a hollow flow channel through which a heat-dissipating fluid, such as air, can be introduced. This effectively cools the interior of the shaft. Furthermore, a first flow channel is formed on the shaft, and a second flow channel is formed on the rotor core. The second flow channel is opposite to and connected to the first flow channel, allowing the heat-dissipating fluid from inside the hollow shaft to enter the rotor core. This effectively cools the rotor core. Compared to existing motors, this invention provides targeted heat dissipation and cooling for both the rotor core and the shaft, improving the cooling effect. It effectively solves the problem of poor heat dissipation for the rotor core in existing high-speed motor assemblies.

[0036] In some implementations... The rotor core 207 is also provided with a third flow channel 3, which extends from one axial end of the rotor core 207 to the other axial end of the rotor core 207, and the third flow channel 3 is connected to the second flow channel 2.

[0037] This invention also utilizes a third flow channel inside the rotor core, which connects with the second flow channel to introduce gas, thereby increasing the cooling and heat dissipation area inside the rotor core, improving the cooling and heat dissipation effect of the rotor core, and allowing the cooled gas to be discharged outside the rotor core.

[0038] In some implementations... The other end of the second flow channel 2 is located inside the rotor core 207 and is spaced from the outer peripheral wall of the rotor core 207 by a preset distance greater than 0. The third flow channel 3 is connected to and communicates with the other end of the second flow channel 2.

[0039] This invention increases the residence time of the airflow inside the rotor core by setting a preset distance greater than 0 between the other end of the second flow channel and the outer peripheral wall of the rotor core, thereby improving the cooling and heat dissipation effect on the rotor core. The third flow channel is connected to the other end of the second flow channel, causing the airflow to bend, avoiding the formation of blind ends that would prevent the airflow from being discharged, thus slowing down the airflow velocity and further increasing the residence time of the airflow, thereby further improving the cooling and heat dissipation effect on the rotor core.

[0040] In some implementations... The first flow channel 1 has multiple channels, and the multiple first flow channels 1 are spaced apart along the axial direction of the rotating shaft 208; It also includes a fourth flow channel 4, one end of which is located at the radial inner peripheral wall of the rotor core 207 and is opposite to and connected to the first flow channel 1. The other end of the fourth flow channel 4 extends toward the interior of the rotor core 207, and the extension length of the fourth flow channel 4 is greater than the extension length of the second flow channel 2.

[0041] This invention, through the aforementioned multiple first flow channels, can be connected to multiple second flow channels, and can also be connected to a fourth flow channel (preferably multiple). The fourth flow channel inside the rotor core can also be opposite to and connected to the first flow channels, and the radial length of the fourth flow channel is longer than that of the second flow channels. This can further cool and dissipate heat to the internal structure of the rotor core that is relatively close to the radial outer periphery, thereby further increasing the cooling and heat dissipation area of ​​the rotor core and improving the cooling and heat dissipation effect.

[0042] In some implementations... It also includes a fifth flow channel 5, which is located inside the rotor core 207. One end of the fifth flow channel 5 is located at one axial end of the rotor core 207 or at the outer peripheral wall of the rotor core 207, and the other end of the fifth flow channel 5 is located at the other axial end of the rotor core 207 or at the outer peripheral wall of the rotor core 207. The fifth flow channel 5 is connected to the fourth flow channel 4.

[0043] This invention also uses the aforementioned fifth flow channel to connect with the fourth flow channel, which can further improve the cooling and heat dissipation effect on the rotor core and allow the cooled gas to be discharged outside the rotor core.

[0044] In some implementations... The other end of the fourth flow channel 4 is located inside the rotor core 207 and is spaced from the outer peripheral wall of the rotor core 207 by a preset distance greater than 0. The fifth flow channel 5 is connected to and communicates with the other end of the fourth flow channel 4. When a third flow channel 3 is also included, the fourth flow channel 4 is also connected to and communicates with the third flow channel 3.

[0045] This invention increases the residence time of airflow inside the rotor core by setting a preset distance greater than 0 between the other end of the fourth flow channel and the outer peripheral wall of the rotor core, thereby improving the cooling and heat dissipation effect on the rotor core. The fifth flow channel is connected to the other end of the fourth flow channel, causing the airflow to bend, avoiding the formation of blind ends that would prevent airflow from being discharged, thus slowing down the airflow velocity, further increasing the airflow residence time, and further improving the cooling and heat dissipation effect on the rotor core. Furthermore, this invention, through a structure in which the fourth flow channel is connected to the third flow channel, can form a network channel structure, which can further increase the cooling and heat dissipation area inside the rotor core and further improve the cooling and heat dissipation effect.

[0046] In some implementations... The rotor core 207 is also provided with a sixth flow channel 6. One end of the sixth flow channel 6 is connected to the fifth flow channel 5, and the other end of the sixth flow channel 6 is located at the outer peripheral wall of the rotor core 207, so that the gas after the rotor core 207 is cooled can be discharged through the sixth flow channel 6.

[0047] This invention further utilizes the aforementioned sixth flow channel to exhaust the gas that has cooled the rotor core via the fifth flow channel. Preferably, the sixth flow channel is radially opposite to the stator core, and can also specifically cool and dissipate heat from the stator core.

[0048] In some implementations... A rotating fan assembly 7 is provided in the hollow flow channel 10 of the rotating shaft 208. The rotating fan assembly 7 is fixed to the rotating shaft 208 so that it can rotate together with the rotating shaft 208. The rotating fan assembly 7 can drive gas to be drawn from the outside of the rotating shaft 208 into the hollow flow channel 10 and discharged from the first flow channel 1 to the inside of the rotor core 207.

[0049] Furthermore, this invention utilizes the aforementioned rotating fan assembly installed in the hollow flow channel, which can rotate as an integral part of the shaft. As the shaft rotates, it automatically draws gas into the hollow flow channel, providing power for cooling the shaft, rotor core, stator, etc.

[0050] This invention provides a cooling structure for an air-bearing high-speed motor rotor. By incorporating blades within a hollow shaft, cooling gas is drawn into the shaft from one side and conducted through pre-drilled holes to the rotor, forming multiple cooling paths and directional channels. This provides radial cooling to the air-bearing thrust bearing, air-bearing radial bearing, and the corresponding rotor moving end. After entering the rotor core, the gas cools the permanent magnets and coils along its path. The overall design is simple and provides significant cooling effect.

[0051] In some implementations... Along the radial direction of the rotating shaft 208, the rotating fan assembly 7 is positioned opposite to the rotor core 207. The rotating shaft 208 is provided with a first air intake 8 and a second air intake 9. Both the first air intake 8 and the second air intake 9 can draw in gas from the outside of the rotating shaft 208 and enter the hollow flow channel 10. The first air intake 8 is located on one axial side of the rotor core 207, and the second air intake 9 is located on the other axial side of the rotor core 207, so that the rotor core 207 is located between the first air intake 8 and the second air intake 9. The rotating fan assembly 7 is a dual-suction fan, capable of drawing in gas from both sides of its axial direction and discharging it through the first flow channel 1.

[0052] This invention further utilizes two air intake ports on the rotating shaft, with a rotating fan assembly located between them. This allows airflow to be drawn from both ends of the rotating fan assembly and directed radially towards the rotor core. The airflow is then directed towards the rotor core for cooling. Preferably, the rotating fan assembly is a double-suction fan, capable of drawing gas from the first and second air intake ports on both sides of the rotor core and then spraying it towards the rotor core for targeted cooling. This further increases the cooling gas flow rate to the rotating shaft and rotor core, thereby improving the cooling and heat dissipation effect.

[0053] In some implementations... It also includes a motor stator 206, which is located on the radial outer periphery of the rotor core 207. The motor stator 206 includes a stator core 11 and a stator winding 12. One end of the fifth flow channel 5 is opposite to the stator winding 12 at one axial end of the stator core 11, and the other end of the fifth flow channel 5 is opposite to the stator winding 12 at the other axial end of the stator core 11.

[0054] This invention, by having the two ends of the aforementioned fifth flow channel respectively positioned opposite to the stator windings at both ends of the stator core, allows gas to be sprayed onto the windings through the fifth flow channel, thereby further improving the cooling effect on the motor stator.

[0055] In some implementations... It also includes a motor housing 205, which is located on the outer periphery of the stator core 11. The motor housing 205 is provided with a first air outlet 13 and a second air outlet 14. The first air outlet 13 is located on the radial outer periphery of the stator winding 12 at one axial end of the stator core 11 and the two are opposite each other radially. The second air outlet 14 is located on the radial outer periphery of the stator winding 12 at the other axial end of the stator core 11 and the two are opposite each other radially.

[0056] The present invention, through the aforementioned motor housing, has first and second air outlets provided thereon, which are respectively opposite to the stator windings at both ends of the rotor core axially. This allows the airflow to pass through the stator windings at both ends before being discharged from the housing, further improving the cooling and heat dissipation effect on the stator windings.

[0057] This utility model also provides a rotating machine (preferably an air-bearing rotating machine, more preferably an air-suspended bearing blower or air compressor), which includes the aforementioned motor assembly, and further includes: A front cover assembly 204 and a rear cover assembly 209 are provided. The front cover assembly 204 is connected to one axial end of the motor housing 205, and the rear cover assembly 209 is connected to the other axial end of the motor housing 205. The radial inner circumference of the front cover assembly 204 is supported on the radial outer circumference of the rotating shaft 208 by a first radial bearing 15 (preferably an air-bearing radial bearing), and the radial inner circumference of the rear cover assembly 209 is supported on the radial outer circumference of the rotating shaft 208 by a second radial bearing 16 (preferably an air-bearing radial bearing). When the rotating shaft 208 is provided with a first air intake 8 and a second air intake 9 The rear cover assembly 209 has a first air intake channel 17 on one axial side, which can communicate with the first air intake port 8. The front cover assembly 204 has a second air intake channel 18, which can communicate with the second air intake port 9.

[0058] The high-efficiency air-bearing high-speed motor cooling structure provided by this utility model uses the hollow shaft to dissipate heat evenly along the rotor core, increasing the heat exchange area and heat exchange capacity, ensuring the cooling effect of the stator and rotor, increasing the cooling of the air-bearing bearing, reducing regional thermal deformation of the rotor, and reducing the rotor's thermal deformation, thereby improving the overall reliability and cooling performance. The first and second air intake channels can respectively supply gas to the first and second air intake ports. After cooling the bearings, shaft, rotor core, and stator, the gas is discharged through the two air outlets on the motor housing, improving the cooling effect on the motor components and bearings.

[0059] In some implementations... It also includes an axial bearing assembly 21, which is located on the axial side of the rear end cover assembly 209 that is relatively away from the rotor core 207, and a first gap channel 19 is provided between the axial bearing assembly 21 and the rear end cover assembly 209. The radially outer end of the first gap channel 19 is connected to the first intake channel 17, and the radially inner end of the first gap channel 19 is opposite to and connected to the first intake port 8. It also includes a primary diffuser 203, which is located on the axial side of the front end cover assembly 204 that is relatively away from the rotor core 207. The primary diffuser 203 and the front end cover assembly 204 have a second gap channel 20. The radially outer end of the second gap channel 20 is connected to the second intake channel 18, and the radially inner end of the second gap channel 20 is opposite to and connected to the second intake port 9.

[0060] The improvement of this utility model lies in changing the central shaft from a solid shaft to a hollow shaft. The hollow shaft is made using an interlocking (thermal fitting) or welding process. A set of blades is thermally fitted inside the hollow shaft, or one end is designed as a blade air intake. Evenly distributed holes are opened in the middle or multiple locations of the hollow shaft. Correspondingly, air distribution grooves and air guide holes are also reserved in the rotor core. When the rotor rotates, the cooling gas is left from the outside, passes through the bearing running space between the end covers to cool the air bearing first, and then flows into the hollow shaft, enters the rotor core, and is sprayed onto the stator core, achieving efficient cooling of the entire machine.

[0061] In some implementations... The first intake channel 17 is opposite to the axial bearing assembly 21 along the radial direction of the rotating shaft 208. The axial bearing assembly 21 has an inlet channel to allow a portion of the airflow from the first intake channel 17 to enter the interior of the axial bearing assembly 21. One axial end of the first gap flow channel 19 is connected to the first radial bearing 15 so that a portion of the airflow can be introduced from the first intake channel 17 into the interior of the first radial bearing 15. One axial end of the second gap flow channel 20 is connected to the second radial bearing 16 so that a portion of the airflow from the second intake channel 18 can be introduced into the interior of the second radial bearing 16.

[0062] This invention utilizes a first intake channel on rotating machinery, positioned opposite to an axial bearing assembly. The axial bearing assembly has an inlet channel that allows some airflow to be introduced into it for effective cooling. Furthermore, through a first gap channel, some airflow is directed into the first radial bearing, achieving a cooling effect. Simultaneously, some airflow is introduced into the hollow shaft through the first intake port for targeted cooling of the shaft, rotor core, and even the stator. Additionally, through a second gap channel, some airflow is directed into the second radial bearing, achieving a cooling effect. Therefore, this invention not only effectively cools the shaft, rotor core, and stator, but also effectively cools and dissipates heat from both the axial and radial bearings, further improving the heat dissipation performance of the motor assembly.

[0063] like Figure 1-6As shown, this utility model consists of a primary compression volute 201, a primary compression impeller 202, a primary diffuser 203, a front end cover assembly 204, a motor housing 205, a high-speed motor stator 206, a high-speed motor rotor core 207, a rotating shaft 208 (hollow shaft), a rear end cover assembly 209, a secondary diffuser assembly 210, a secondary volute 211, and a secondary compression impeller 212.

[0064] The axial bearing assembly 21 of this utility model includes a thrust plate 22, a front axial bearing and bearing housing, a bearing adjusting ring with a flow channel, and a rear axial bearing.

[0065] In this invention, the primary compression impeller 202, rotor core 207, and secondary compression impeller 212 are all mounted on a hollow shaft. When the motor stator 206 is energized, the hollow shaft drives the above components to rotate and perform work under the excitation of the current.

[0066] The hollow shaft of this invention has evenly distributed air guide grooves or air guide holes (first air intake 8 and second air intake 9). These air guide grooves or air guide holes can be obliquely cut according to the rotation direction to facilitate air intake. At the same time, air guide holes (first flow channel 1) are also reserved at the assembly position with the rotor core 207 to facilitate the entry of cooling gas into the rotor core. The present invention involves preheating or installing a rotating fan assembly 7 inside a hollow shaft.

[0067] The rotating fan assembly 7 of this utility model is preferably equipped with rotating blades on both sides, and the air intake rotation direction of the blades is designed to be consistent with the rotation direction of the entire shaft.

[0068] The rotor core 207 of this utility model is provided with uniformly distributed air guide holes (including the second flow channel 2 and the fourth flow channel 4) that communicate with the hollow shaft. The holes can be configured as multi-layer or alternating flow channels. The ends of the flow channels connect to the motor cavities on both sides or the mechanical gap between the stator and rotor. Furthermore, the exhaust port outlet can be configured as an oblique opening to directly blow air to cool the motor coil.

[0069] The working principle of this utility model is as follows: When the motor rotates, the rotating fan assembly 7 rotates, forming a guide flow inside the hollow shaft, as shown in the schematic diagram of the internal flow channel of the motor: gas is drawn in by the rotating fan assembly 7 inside the hollow shaft of the motor, and the external air enters the bearing chamber through the vent holes (first air intake channel 17 and second air intake channel 18) reserved on the front end cover assembly 204 and the rear end cover assembly 209, respectively cooling the radial bearing and the axial bearing on both sides and reducing their operating temperature; then it passes through the evenly distributed air guide grooves or air guide holes reserved on the hollow shaft. (First intake port 8 and second intake port 9) enter the hollow shaft to effectively cool the entire shaft; the cooling gas flows through the holes in the middle of the hollow shaft (first flow channel 1, second flow channel 2 and fourth flow channel 4) and enters the rotor core 207 of the high-speed motor, and rapidly exchanges heat and cools the laminations and permanent magnets that flow nearby. Then, it is blown towards the stator core of the high-speed motor through the exhaust ports located at both ends or in the middle, achieving efficient heat exchange for the stator core and coil that are overheating. Finally, it is discharged from the motor cavity to complete the cooling circuit.

[0070] The beneficial effects of this utility model are: 1. Improves the overall cooling performance of the air compressor. Through a designed dual-channel cooling system, efficient heat exchange is achieved for all parts of the motor, enabling directional cooling under air-cooled conditions. Using a hollow shaft as the air-cooling channel allows cooling gas to penetrate deeply into the permanent magnet and air bearing, quickly removing heat and preventing bearing failure and excessively high permanent magnet temperatures. 2. Ensures long-term safe operation of the high-speed rotor. Because the cooling gas flows through the entire high-speed motor rotor, the uneven heating caused by single points or regions is improved, ensuring the consistency of rotor operation and avoiding rotor deformation under high temperature conditions, which would affect the high-speed operation posture and indirectly ensure the overall operating efficiency of the machine.

[0071] 3. Negative pressure intake cooling is achieved through the rotation of the rotating fan assembly 7. This means the gas entering the motor cavity is not compressed and is at room temperature. Compared to forced draft cooling, this increases the temperature difference between the cooling gas and the heat-generating components of the motor, reduces the ambient cooling temperature, improves heat exchange efficiency, significantly lowers the internal temperature of the air compressor, and ensures the overall cooling performance of the air compressor. (Preferably, the fan can be interference-fitted with the hollow shaft or have steps inside the hollow shaft to fix the fan. As the hollow shaft rotates as a whole, the blades rotate in the same direction as the shaft, enabling axial intake and radial exhaust.)

[0072] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. 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 this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A motor assembly, characterized in that: include: The rotating shaft (208) and the rotor core (207) are hollow shafts with a hollow flow channel (10) through which heat dissipation fluid can flow. The rotor core (207) is fitted around the outer periphery of the rotating shaft (208). A first flow channel (1) is provided on the rotating shaft (208). One end of the first flow channel (1) flows through the hollow flow channel (10), and the other end extends to the outer peripheral wall of the rotating shaft (208). A second flow channel (2) is provided on the rotor core (207). One end of the second flow channel (2) is located at the radial inner peripheral wall of the rotor core (207) and is opposite to and connected to the first flow channel (1). The other end of the second flow channel (2) extends toward the interior of the rotor core (207).

2. The motor assembly according to claim 1, characterized in that: The rotor core (207) is also provided with a third flow channel (3), which extends from one axial end of the rotor core (207) to the other axial end of the rotor core (207), and the third flow channel (3) is connected to the second flow channel (2).

3. The motor assembly according to claim 2, characterized in that: The other end of the second flow channel (2) is located inside the rotor core (207) and is spaced from the outer peripheral wall of the rotor core (207) by a preset distance greater than 0. The third flow channel (3) is connected to and communicates with the other end of the second flow channel (2).

4. The motor assembly according to claim 1, characterized in that: The first flow channel (1) has multiple channels, and the multiple first flow channels (1) are spaced apart along the axial direction of the rotating shaft (208); It also includes a fourth flow channel (4), one end of which is located at the radial inner peripheral wall of the rotor core (207) and is opposite to and connected to the first flow channel (1). The other end of the fourth flow channel (4) extends toward the interior of the rotor core (207), and the extension length of the fourth flow channel (4) is greater than the extension length of the second flow channel (2).

5. The motor assembly according to claim 4, characterized in that: It also includes a fifth flow channel (5), which is located inside the rotor core (207). One end of the fifth flow channel (5) is located at one axial end of the rotor core (207) or at the outer peripheral wall of the rotor core (207), and the other end of the fifth flow channel (5) is located at the other axial end of the rotor core (207) or at the outer peripheral wall of the rotor core (207). The fifth flow channel (5) is connected to the fourth flow channel (4).

6. The motor assembly according to claim 5, characterized in that: The other end of the fourth flow channel (4) is located inside the rotor core (207) and is spaced from the outer peripheral wall of the rotor core (207) by a preset distance greater than 0. The fifth flow channel (5) is connected to and communicates with the other end of the fourth flow channel (4). When a third circulation channel (3) is also included, the fourth circulation channel (4) is also connected to and communicates with the third circulation channel (3).

7. The motor assembly according to claim 5, characterized in that: The rotor core (207) is also provided with a sixth flow channel (6). One end of the sixth flow channel (6) is connected to the fifth flow channel (5), and the other end of the sixth flow channel (6) is located at the outer peripheral wall of the rotor core (207) so that the gas after the rotor core (207) is cooled can be discharged through the sixth flow channel (6).

8. The motor assembly according to claim 1, characterized in that: A rotating fan assembly (7) is provided in the hollow flow channel (10) of the rotating shaft (208). The rotating fan assembly (7) is fixed to the rotating shaft (208) so that it can rotate together with the rotating shaft (208). The rotating fan assembly (7) can drive gas to be drawn into the hollow flow channel (10) from the outside of the rotating shaft (208) and discharged from the first flow channel (1) to the inside of the rotor core (207).

9. The motor assembly according to claim 8, characterized in that: Along the radial direction of the rotating shaft (208), the position of the rotating fan assembly (7) is opposite to the position of the rotor core (207). The rotating shaft (208) is provided with a first air intake (8) and a second air intake (9). Both the first air intake (8) and the second air intake (9) can draw in gas from the outside of the rotating shaft (208) and enter the hollow flow channel (10). The first air intake (8) is located on one axial side of the rotor core (207), and the second air intake (9) is located on the other axial side of the rotor core (207), so that the rotor core (207) is located between the first air intake (8) and the second air intake (9). The rotating fan assembly (7) is a dual-suction fan, which can draw in gas from both sides of its axial direction and discharge it through the first flow channel (1).

10. The motor assembly according to claim 5, characterized in that: It also includes a motor stator (206), which is located on the radial outer periphery of the rotor core (207). The motor stator (206) includes a stator core (11) and a stator winding (12). One end of the fifth flow channel (5) is opposite to the stator winding (12) at one axial end of the stator core (11), and the other end of the fifth flow channel (5) is opposite to the stator winding (12) at the other axial end of the stator core (11).

11. The motor assembly according to claim 10, characterized in that: It also includes a motor housing (205), which is located on the outer periphery of the stator core (11), and the motor housing (205) is provided with a first air outlet (13) and a second air outlet (14). The first air outlet (13) is located on the radial outer periphery of the stator winding (12) at one axial end of the stator core (11), and the two are opposite each other radially. The second air outlet (14) is located on the radial outer periphery of the stator winding (12) at the other axial end of the stator core (11), and the two are opposite each other radially.

12. A rotating machine, characterized in that: Including the motor assembly of claim 11, it further includes: A front cover assembly (204) and a rear cover assembly (209) are provided. The front cover assembly (204) is connected to one axial end of the motor housing (205), and the rear cover assembly (209) is connected to the other axial end of the motor housing (205). The radial inner circumference of the front cover assembly (204) is supported on the radial outer circumference of the rotating shaft (208) by a first radial bearing (15), and the radial inner circumference of the rear cover assembly (209) is supported on the radial outer circumference of the rotating shaft (208) by a second radial bearing (16). When the rotating shaft (208) is provided with a first air intake (8) and a second air intake (9), The rear cover assembly (209) has a first air intake channel (17) on one axial side, which can communicate with the first air intake port (8). The front cover assembly (204) has a second air intake channel (18), which can communicate with the second air intake port (9).

13. The rotating machinery according to claim 12, characterized in that: It also includes an axial bearing assembly (21), which is located on the axial side of the rear end cover assembly (209) that is relatively away from the rotor core (207), and there is a first gap channel (19) between the axial bearing assembly (21) and the rear end cover assembly (209). The radially outer end of the first gap channel (19) is connected to the first intake channel (17), and the radially inner end of the first gap channel (19) is opposite to and connected to the first intake port (8). It also includes a primary diffuser (203), which is located on the axial side of the front end cover assembly (204) that is relatively away from the rotor core (207), and there is a second gap channel (20) between the primary diffuser (203) and the front end cover assembly (204). The radially outer end of the second gap channel (20) is connected to the second intake channel (18), and the radially inner end of the second gap channel (20) is opposite to and connected to the second intake port (9).

14. The rotating machinery according to claim 13, characterized in that: The first intake channel (17) is opposite to the axial bearing assembly (21) in the radial direction of the rotating shaft (208). The axial bearing assembly (21) has an inlet channel to allow a portion of the airflow from the first intake channel (17) to enter the interior of the axial bearing assembly (21). One axial end of the first gap flow channel (19) is connected to the first radial bearing (15) so that a portion of the airflow can be introduced from the first intake channel (17) into the interior of the first radial bearing (15). One axial end of the second gap flow channel (20) is connected to the second radial bearing (16) so that a portion of the airflow can be introduced from the second intake channel (18) into the interior of the second radial bearing (16).

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