An electric motor, compressor

Abstract

This invention provides an electric motor and a compressor, wherein the motor includes a housing, a first cover at one end of the housing and a second cover at the other end, the housing, the first cover, and the second cover forming a hollow cavity structure; a stator, the stator being disposed within the housing, and a main shaft being sleeved within the stator; the main shaft includes a sleeve, within which a rotor magnet and a short shaft are disposed, the first cover being at least partially sleeved within the sleeve, a first bearing being disposed between the first cover and the inner wall of the sleeve, and a second cover being at least partially sleeved within the sleeve, a second bearing being disposed between the second cover and the inner wall of the sleeve, the first cover, the rotor magnet, the short shaft, and the second cover being sequentially located within the sleeve along the axial direction of the sleeve, and the short shaft sequentially passing through the second cover and at least partially extending out of the second cover. According to this invention, the defect of the prior art where the support bearings are assembled on both sides of the outer ring of the motor main shaft, resulting in an increase in motor size, is overcome, thus improving the practicality of the motor.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to a motor and a compressor. Background Technology

[0002] Centrifugal turbine machinery, such as air compressors using ultra-high-speed motors, has high rotational speeds and high reliability requirements. Using traditional rolling bearings as support bearings would severely limit their rotational speed and require complex oil-air lubrication systems and other additional structures, while also limiting reliability. The advantages of air suspension bearings make them perfectly suited for ultra-high-speed motors and related products. With technological advancements, ultra-high-speed motors are becoming increasingly powerful and have higher rotational speeds, resulting in larger journal dimensions. However, the overall size and weight of the machine must be kept as small as possible. Therefore, ultra-high-speed motors and related products are developing towards compactness. The relative position and electrical safety between the bearing housing and the stator coil of the ultra-high-speed motor in the air suspension bearing structure are among the important factors affecting the axial dimensions of ultra-high-speed motors and related products.

[0003] In traditional compressors using centrifugal impellers, the support bearings are mounted on both sides of the outer ring of the motor main shaft. To avoid interference between the front and rear radial bearing housings and the inner ring and ends of the coil of the ultra-high-speed motor, and to ensure a certain electrical safety distance, axial stretching is required in the design, and the radial bearings are moved back and forth along the compressor main shaft. This design will result in an increase in the overall length of the motor main shaft, which will increase the axial volume of the compressor. Furthermore, as the motor main shaft lengthens, its inherent mode will also decrease, which will restrict the design operating speed of the compressor.

[0004] Because the support bearings in the existing technology are assembled on both sides of the outer ring of the motor main shaft, in order to avoid interference between the front and rear radial bearing seats and the inner ring and end of the coil of the ultra-high speed motor, it is necessary to axially stretch the motor main shaft and translate the radial bearings along the front and rear sides of the compressor main shaft, which leads to technical problems such as lengthening the overall length of the motor main shaft and increasing the axial volume of the compressor. Therefore, this invention studies and designs a motor and a compressor. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art where the support bearings are assembled on both sides of the outer ring of the motor spindle, resulting in an increase in the size of the motor, thereby providing a motor and a compressor.

[0006] To address the above problems, the present invention provides a motor comprising,

[0007] A housing, wherein a first cover is provided at one end of the housing and a second cover is provided at the other end, and the housing, the first cover and the second cover form a hollow cavity structure;

[0008] A stator, wherein the stator is disposed within the housing, and a main shaft is sleeved within the stator;

[0009] The main shaft includes a sleeve, in which a rotor magnet and a short shaft are disposed. A first cover is at least partially fitted inside the sleeve, and a first bearing is disposed between the first cover and the inner wall of the sleeve. A second cover is at least partially fitted inside the sleeve, and a second bearing is disposed between the second cover and the inner wall of the sleeve. Along the axial direction of the sleeve, the first cover, the rotor magnet, the short shaft, and the second cover are sequentially located inside the sleeve, and the short shaft passes through the second cover sequentially and at least partially extends out of the second cover.

[0010] In some embodiments, the first cover is provided with a first mounting part, which is sleeved in the sleeve body. A first bearing is provided between the first mounting part and the inner wall of the sleeve body. The second cover is provided with a second mounting part, which is sleeved in the sleeve body. A second bearing is provided between the second mounting part and the inner wall of the sleeve body. Along the axial direction of the sleeve body, the first mounting part, the rotor magnet, the short shaft, and the second mounting part are sequentially located in the sleeve body. After the short shaft passes through the second mounting part and the second cover body in sequence, at least a portion of the short shaft extends out of the second cover body.

[0011] In some embodiments, the sleeve includes a first segment, a second segment, and a third segment connected in sequence, the second segment being located between the first segment and the third segment along the axial direction of the sleeve, the first mounting portion being at least partially located in the first segment, the rotor magnet being located in the second segment, and the second mounting portion and the short shaft being located in the third segment.

[0012] In some embodiments, the outer wall of the first mounting part is provided with a first fixing member, the first bearing is located between the first fixing member and the first cover, and the outer wall of the second mounting part is provided with a second fixing member, the second bearing is located between the second fixing member and the second cover.

[0013] In some embodiments, a first groove is provided on the side of the second cover facing away from the stator, and a diffuser is provided in the first groove. Along the axial direction of the sleeve, a second through hole is provided on the second mounting part, and the second through hole communicates with the first groove. The short shaft passes through the second through hole and the first groove in sequence, and a thrust plate is provided on the short shaft. The thrust plate is located between the diffuser and the bottom surface of the first groove. A third bearing is provided on the side of the diffuser facing the first groove, and a fourth bearing is provided in the first groove. The third bearing and the fourth bearing are respectively located on both sides of the thrust plate.

[0014] In some embodiments, the short shaft includes a first portion, a second portion, a third portion, and a fourth portion connected in sequence, the diameters of the first portion, the second portion, the third portion, and the fourth portion decreasing sequentially, the first portion being located within the sleeve, the second portion being located within the second through hole, and the third portion extending at least partially and the fourth portion extending out of the first groove.

[0015] In some embodiments, the first cover is provided with a first through hole, an inlet is formed between the diffuser and the short shaft, a first flow channel is formed between the second mounting part and the short shaft, the first cover is provided with a first through hole, the inlet is used for the flow of cooling medium, the cooling medium flows through the outer wall of the sleeve after flowing into the inlet, and then flows out from the first through hole.

[0016] In some embodiments, a second flow channel is formed between the diffuser, the thrust plate and the inner wall of the first groove, a third flow channel is formed between the sleeve and the second cover, and a fourth flow channel is formed between the sleeve and the stator. The inlet, the second flow channel, the first flow channel, the third flow channel, the fourth flow channel and the first through hole are connected in sequence.

[0017] In some embodiments, along the axial direction of the sleeve, the first mounting portion is provided with a second groove, the first through hole is connected to the second groove, a fifth flow channel is formed between the first mounting portion and the sleeve, and a sixth flow channel is formed between the sleeve and the first cover shown, the fourth flow channel, the sixth flow channel, and the fifth flow channel are connected in sequence.

[0018] In some embodiments, a baffle is also provided inside the sleeve, the baffle being located between the rotor magnet and the first mounting part, and the length of the second segment is greater than the sum of the lengths of the first segment and the third segment.

[0019] In some embodiments, a cooling channel is provided inside the housing, the cooling channel having a first opening and a second opening, the first opening and the second opening being disposed on the outer wall of the housing, and the cooling channel being arranged in a spiral shape.

[0020] In some embodiments, a coil is provided on the stator, and the length of the coil along the axial direction of the sleeve is not less than the length of the rotor magnet. A third cover is provided on the side of the second cover facing away from the housing, the main shaft passes through the third cover, and an air inlet is provided on the third cover.

[0021] The present invention also provides a compressor comprising the motor described in any of the preceding claims.

[0022] In some embodiments, when the short shaft comprises a first part, a second part, a third part, and a fourth part connected in sequence, an impeller is provided on the fourth part.

[0023] The electric motor and compressor provided by this invention have the following beneficial effects:

[0024] By fitting a portion of the first cover and a portion of the second cover into the sleeve, and providing a first bearing between the first cover and the inner wall of the sleeve, and a second bearing between the second cover and the inner wall of the sleeve, the volume of the radial bearing seat is effectively reduced by using an internal bearing method. This avoids interference between the bearing seat and the end of the stator coil of the ultra-high speed motor, while also reducing the axial volume of the motor and meeting the motor's volume requirements. Attached Figure Description

[0025] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0026] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0027] Figure 1 This is a schematic diagram of the structure of the motor according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the motor according to the second embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the rotor structure of the motor according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the sleeve in the motor according to an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the short shaft in the motor according to an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of the first cover in the motor according to an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of the second cover in the motor according to an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the compressor according to the third embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of the rotor structure in the compressor according to the third embodiment of the present invention.

[0036] The reference numerals in the attached figures are as follows:

[0037] 1. Short shaft; 2. Sleeve; 3. Baffle; 4. Rotor magnet; 5. Thrust plate; 6. Impeller; 7. Housing; 8. Volute; 9. First cover; 10. Second cover; 11. Diffuser; 12. Third cover; 13. Third bearing; 14. Fourth bearing; 15. Cooling channel; 16. First through hole; 17. First mounting part; 18. First bearing; 19. First fixing part; 20. Second groove; 21. First groove; 22. Second mounting part; 23. Second bearing; 24. Second fixing part; 25. Second through hole; 26. First section; 27. Second section; 28. Third section; 29. ​​First part; 30. Second part; 31. Third part; 32. Fourth part; 33. Stator; 34. Coil. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] 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.

[0040] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0041] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the 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 figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0042] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0043] 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.

[0044] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0045] See also Figures 1 to 9 As shown, according to an embodiment of the present invention, an electric motor is provided, comprising: a housing 7, one end of which is provided with a first cover 9 and the other end with a second cover 10, the housing 7, the first cover 9, and the second cover 10 forming a hollow cavity structure; a stator 33, the stator 33 being disposed within the housing 7, and a main shaft being sleeved within the stator 33; the main shaft including a sleeve 2, the sleeve 2 being provided with a rotor magnet 4 and a short shaft 1, the first cover 9 being at least partially sleeved within the sleeve 2, a first bearing 18 being disposed between the first cover 9 and the inner wall of the sleeve 2, the second cover 10 being at least partially sleeved within the sleeve 2, a second bearing 23 being disposed between the second cover 10 and the inner wall of the sleeve 2, the first cover 9, the rotor magnet 4, the short shaft 1, and the second cover 10 being sequentially located within the sleeve 2 along the axial direction of the sleeve 2, and the short shaft 1 sequentially passing through the second cover 10 and at least partially extending out of the second cover 10. In this technical solution, a portion of the first cover 9 and a portion of the second cover 10 are fitted inside the sleeve 2. A first bearing 18 is provided between the first cover 9 and the inner wall of the sleeve 2, and a second bearing 23 is provided between the second cover 10 and the inner wall of the sleeve 2. By adopting an internal bearing method, the volume of the radial bearing seat is effectively reduced, avoiding interference between the bearing seat and the end of the stator coil of the ultra-high speed motor, while reducing the axial volume of the motor and meeting the volume requirements of the motor. At least a portion of the short shaft 1, the rotor magnet 4, and the sleeve 2 are fitted with an interference fit.

[0046] Traditional motors, to avoid interference between the front and rear radial bearing housings and the inner coils and ends of the ultra-high-speed motor windings, and to ensure a certain electrical safety distance, require axial stretching and translation of the radial bearings along the compressor's main shaft. This design elongates the overall length of the compressor's main shaft, increasing its axial volume. Furthermore, as the compressor's main shaft lengthens, its inherent mode decreases, limiting the compressor's designed operating speed. This invention employs a built-in air bearing stator, effectively reducing the volume of the radial bearing housings, avoiding interference between the bearing housings and the ends of the ultra-high-speed motor stator windings, while simultaneously reducing the motor's axial volume.

[0047] In some implementations, see reference Figure 6 and Figure 7As shown, the first cover 9 is provided with a first mounting part 17, which is sleeved inside the sleeve 2. A first bearing 18 is provided between the first mounting part 17 and the inner wall of the sleeve 2. The second cover 10 is provided with a second mounting part 22, which is sleeved inside the sleeve 2. A second bearing 23 is provided between the second mounting part 22 and the inner wall of the sleeve 2. Along the axial direction of the sleeve 2, the first mounting part 17, the rotor magnet 4, the short shaft 1, and the second mounting part 22 are sequentially located inside the sleeve 2. After the short shaft 1 passes through the second mounting part 22 and the second cover 10 in sequence, at least part of the short shaft 1 extends out of the second cover 10. In this technical solution, the first bearing 18 and the second bearing 23 are air bearings, preferably foil-type air bearings. The air bearing stators are respectively mounted on the first mounting part 17 and the second mounting part 22. Through the first mounting part 17 and the second mounting part 22, the bearing and the sleeve 2 are integrated in a built-in manner, which effectively reduces the volume of the radial bearing housing, avoids interference between the bearing housing and the end of the stator coil of the ultra-high speed motor, and reduces the axial volume of the motor to meet the volume requirements of the motor.

[0048] In some implementations, see reference Figure 4 As shown, the sleeve 2 includes a first segment 26, a second segment 27, and a third segment 28 connected sequentially. The second segment 27 is located between the first segment 26 and the third segment 28. Along the axial direction of the sleeve 2, the first mounting part 17 is at least partially located in the first segment 26, the rotor magnet 4 is located in the second segment 27, and the second mounting part 22 and the short shaft 1 are located in the third segment 28. In this technical solution, at least a portion of the rotor magnet 4 and the short shaft 1 are interference-fitted with the sleeve 2. The sleeve 2 has a relatively thin wall thickness. The first bearing 18 and the second bearing 23 are machined as air bearings and assembled as components. As long as the surface roughness of the first mounting part 17 and the second mounting part 22 of the ultra-high speed motor rotor meets the design standard after assembly, that is, when the bearing adopts a micro-groove bearing, a specific groove structure needs to be etched on the surface of the bearing stator; component assembly refers to the need to process some auxiliary fixing structures on the surface of the bearing stator when the bearing adopts foil type or other bearing forms. Microgroove air bearings are preferred as the primary bearing type. The features of microgroove bearings can be directly engraved on the bearing surface without the need for additional components, which is very beneficial for the design, assembly, and manufacturing of built-in radial air bearing stators.

[0049] In some embodiments, the outer wall of the first mounting portion 17 is provided with a first fixing member 19, the first bearing 18 is located between the first fixing member 19 and the first cover 9, the outer wall of the second mounting portion 22 is provided with a second fixing member 24, and the second bearing 23 is located between the second fixing member 24 and the second cover 10. In this technical solution, the first cover 9 and the second cover 10 have bosses. Preferably, the bosses are cylindrical, and the diameters of the first mounting portion 17 and the second mounting portion 22 are smaller than the diameters of the bosses. The second cover 10 and the second mounting portion 22, and the first cover 9 and the first mounting portion 17 adopt an integral structure. The first bearing 18 and the second bearing 23 are respectively located between the bosses and the first fixing member 19 and the second fixing member 24. The bosses on the first cover 9 and the first fixing member 19 limit the axial movement of the first bearing 18, and the bosses on the second cover 10 and the second fixing member 24 limit the axial movement of the second bearing 23, ensuring that the bearing stator will not loosen during actual operation. The first bearing 18 and the second bearing 23 can be foil-type air bearings. In this scheme, the first bearing 18 and the second bearing 23 will no longer be bearing stators, but will serve as bushing bases for the foil. The foil is embedded and fixed on the bushing base. After the bushing base is assembled onto the first mounting part 17 and the second mounting part 22, the bushing base is fixed using the first fixing member 19 and the second fixing member 24. Preferably, the first fixing member 19 and the second fixing member 24 are fixing snap rings.

[0050] In some embodiments, a first groove 21 is provided on the side of the second cover 10 facing away from the stator 33. A diffuser 11 is disposed in the first groove 21. Along the axial direction of the sleeve 2, a second through hole 25 is provided on the second mounting part 22, which communicates with the first groove 21. The short shaft 1 passes through the second through hole 25 and the first groove 21 in sequence. A thrust plate 5 is disposed on the short shaft 1, located between the diffuser 11 and the bottom surface of the first groove 21. A third bearing 13 is disposed on the side of the diffuser 11 facing into the first groove 21, and a fourth bearing 14 is disposed in the first groove 21. The third bearing 13 and the fourth bearing 14 are respectively located on both sides of the thrust plate 5. The axial force generated by the third bearing 13 and the fourth bearing 14 after floating restricts the axial displacement of the rotor. In this technical solution, the third bearing 13 is installed on the diffuser 11, and the fourth bearing 14 is installed on the second cover 10. The third bearing 13 and the fourth bearing 14 are axial bearings. The fourth bearing 14 and the third bearing 13 are located on both sides of the thrust plate 5. Preferably, the depth of the first groove 21 is slightly greater than the sum of the thicknesses of the third bearing 13, the diffuser 11, the fourth bearing 14 and the thrust plate 5. The short shaft 1 can rotate within the second through hole 25. The thrust plate 5 is fixed on the short shaft 1, and the axial movement of the motor rotor is restricted by the thrust bearings on the left and right sides of the thrust plate 5.

[0051] The second cover 10 has a first groove 21 on the side facing away from the stator 33. Along the axial direction of the sleeve 2, the second mounting part 22 has a second through hole 25, which is connected to the first groove 21. The short shaft 1 passes through the second through hole 25 and the first groove 21 in sequence. A diffuser 11 and a thrust plate 5 are arranged on the short shaft 1 in sequence. A third bearing 13 and a fourth bearing 14 are arranged on both sides of the diffuser 11. The thrust plate 5, the third bearing 13, the diffuser 11 and the fourth bearing 14 are located in the first groove 21. The third bearing 13 is closer to the second mounting part 22 than the diffuser 11. The fourth bearing 14 is located between the thrust plate 5 and the diffuser 11. The thrust plate 5 is arranged on the inner wall of the first groove 21. In this technical solution, the third bearing 13 and the fourth bearing 14 are axial bearings. The fourth bearing 14 and the third bearing 13 are located on both sides of the diffuser 11. Preferably, the depth of the first groove 21 is equal to the sum of the thicknesses of the third bearing 13, the diffuser 11, the fourth bearing 14 and the thrust plate 5. The third bearing 13, the diffuser 11 and the fourth bearing 14 are fixed by the thrust plate 5. The third bearing 13, the diffuser 11 and the fourth bearing 14 are fixed in the first groove 21, and the short shaft 1 can rotate in the second through hole 25 and the thrust plate 5.

[0052] In some implementations, see reference Figure 3 As shown, the short shaft 1 includes a first part 29, a second part 30, a third part 31, and a fourth part 32 connected in sequence. The diameters of the first part 29, the second part 30, the third part 31, and the fourth part 32 decrease sequentially. The first part 29 is located inside the sleeve 2, the second part 30 is located inside the second through hole 25, and the third part 31, at least partially, and the fourth part 32 extend out of the first groove 21. In this technical solution, the sequentially decreasing diameters of the first part 29, the second part 30, the third part 31, and the fourth part 32 give the short shaft 1 a stepped structure, ensuring an interference fit between the first part 29 and the sleeve 2. The second part 30 has a gap with the inner wall of the second through hole 25. The thrust plate 5 is located on the third part 31, and the third part 31, at least partially, and the fourth part 32 extend out of the first groove 21. The fourth part 32 serves as a load-bearing portion, and its stepped structure limits the load on the fourth part 32.

[0053] In some embodiments, the first cover 9 is provided with a first through hole 16, an inlet is formed between the diffuser 11 and the short shaft 1, and a first flow channel is formed between the second mounting part 22 and the short shaft 1. The first cover 9 is provided with a first through hole 16, and the inlet is used for the inflow of cooling medium. After flowing into the inlet, the cooling medium can flow through the outer wall of the sleeve 2 and then flow out from the first through hole 16. In this technical solution, after the cooling medium flows into the inlet, it can flow through the outer wall of the sleeve 2 and then flow out from the first through hole 16, thereby cooling the inside of the motor, providing sufficient cooling for the ultra-high speed motor rotor, and reducing the thermal deformation of the shaft.

[0054] In some implementations, see reference Figure 1 As shown, a second flow channel is formed between the diffuser 11, the thrust plate (5), and the inner wall of the first groove 21; a third flow channel is formed between the sleeve 2 and the second cover 10; and a fourth flow channel is formed between the sleeve 2 and the stator 33. The inlet, the second flow channel, the first flow channel, the third flow channel, the fourth flow channel, and the first through hole 16 are sequentially connected. In this technical solution, after the cooling medium flows into the inlet, it sequentially passes through the third bearing 13, the second flow channel, the fourth bearing 14, the first flow channel, the second bearing 23, the third flow channel, and the fourth flow channel, and then flows out from the first through hole, thereby cooling the third bearing 13, the fourth bearing 14, the second bearing 23, the short shaft, the sleeve 2, and the stator 33, reducing the internal temperature of the motor, and improving the motor efficiency.

[0055] In some embodiments, along the axial direction of the sleeve 2, the first mounting portion 17 is provided with a second groove 20, the first through hole 16 communicates with the second groove 20, a fifth flow channel is formed between the first mounting portion 17 and the sleeve 2, and a sixth flow channel is formed between the sleeve 2 and the first cover 9 shown, the fourth flow channel, the sixth flow channel, and the fifth flow channel are sequentially connected. In this technical solution, the cooling medium flowing through the fourth flow channel flows into the first bearing 18 through the sixth channel, then flows into the second groove 20 through the fifth flow channel, and then flows out through the first through hole 16.

[0056] In some embodiments, a baffle 3 is further provided inside the sleeve 2, the baffle 3 being located between the rotor magnet 4 and the first mounting portion 17, and the length of the second segment 27 being greater than the sum of the lengths of the first segment 26 and the third segment 28. Preferably, in this technical solution, there is a gap between the first mounting portion 17 and the baffle 3, thereby ensuring that the cooling medium flows into the second groove 20 after passing through the first bearing 18. The length of the second segment 27 being greater than the sum of the lengths of the first segment 26 and the third segment 28 ensures the interaction between the rotor magnet 4 and the stator, thereby providing power to the main shaft.

[0057] In some embodiments, a cooling channel 15 is provided inside the housing 7. The cooling channel 15 has a first opening and a second opening, which are located on the outer wall of the housing 7. The cooling channel 15 is arranged in a spiral shape. In this technical solution, the cooling channel 15 uses water cooling to cool the motor housing 7. The motor of this invention utilizes the air gap between the rotor, end cover, and stator to complete the design of the cooling channel for the entire machine bearing and the motor rotor. The stator structure completes the design of the cooling gas channel, eliminating the need for many auxiliary designs and ensuring the simplification of the overall cooling system structure. The gas cooling channel begins at the gap between the diffuser 11 and the short shaft 1. After passing through the third bearing 13, the cooling gas enters the cavity in the first groove 21. Since the second cover 10 is in direct contact with the housing 7, it is also cooled by the housing 7. Therefore, the gas entering the cavity of the first groove 21 will also undergo the first cooling, reducing the gas temperature and improving the subsequent cooling efficiency. After passing through the cavity of the 10-front cover assembly, the cooling gas passes through and cools the fourth bearing 14, and then enters the first flow channel, the second bearing 23, and the third flow channel to carry away the heat generated and transferred by the rotor magnet 4 during the operation of the motor rotor. It then enters the fourth flow channel to cool the second bearing 23. The discharged cooling gas enters the motor cavity. Since the housing 7 and the second cover 10 are in direct contact with the housing 7, the second cover 10 will also be cooled by the housing 7. 0. The first cover 9, the cooling gas entering the motor cavity will undergo a second cooling before cooling the rotor, so as to improve the cooling effect on the outer surface of the compressor rotor. The second cooling gas enters the motor cavity on the other side after passing through the fourth flow channel, and the cooling gas undergoes a third cooling. After the third cooling, the cooling gas passes through the sixth channel to cool the first bearing 18 and the baffle 3. When the motor rotor is running, the heat generated by the rotor magnet 4 will be transferred to the baffle 3. Cooling the baffle 3 is to cool the motor rotor. Finally, it enters the second groove 20 and is discharged from the whole machine through the first through hole 16. The above is a complete air-cooling flow channel formed by the air gap between the compressor rotor, end cover and stator of an external rotor air bearing supported compressor.

[0058] In some implementations, see reference Figure 2 As shown, a coil 34 is provided on the stator 33. Along the axial direction of the sleeve 2, the length of the coil 34 is not less than the length of the rotor magnet 4. A third cover 12 is provided on the side of the second cover 10 facing away from the housing 7. The main shaft passes through the third cover 12, and an air inlet is provided on the third cover 12. In this technical solution, a third cover 12 is added to the end of the second cover 10, and an air inlet is opened on the outer edge of the third cover 12. External cooling medium is injected through this air inlet as an initial cooling air source to activate the above-mentioned complete air-cooled flow channel.

[0059] The present invention also provides a compressor comprising the motor described in any of the preceding claims.

[0060] In some implementations, see collections. Figure 7 and Figure 8 As shown, when the short shaft 1 includes a first part 29, a second part 30, a third part 31, and a fourth part 32 connected in sequence, an impeller 6 is provided on the fourth part 32. In this technical solution, the impeller 6 is a centrifugal impeller. The cooling gas source of the compressor supported by the air bearing is the high-pressure gas compressed by the impeller 6. Part of the high-pressure gas flows into the second flow channel through the inlet, which is the starting point of the entire gas cooling channel. The flow direction of the part of the high-pressure gas after being compressed by the impeller is as follows: it flows in from the gap between the back of the impeller 6 and the diffuser 11, flows through the gap between the short shaft 1 and the diffuser 11 and enters the first groove 21. In the first groove, it flows through the third bearing 13 and the fourth bearing 14 respectively, enters the second bearing 23 through the gap between the short shaft 1 and the second through hole 25, enters the motor cavity through the internal gap of the second bearing 23 and the gap between it and the sleeve 2; it flows through the gap between the sleeve 2 and the stator 33, then enters the first bearing 18 and the third through hole 20, and finally flows out from the first through hole 16.

[0061] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An electric motor, characterized in that, include, The shell (7) has a first cover (9) at one end and a second cover (10) at the other end, and the shell (7), the first cover (9) and the second cover (10) form a hollow cavity structure; Stator (33), the stator (33) is disposed inside the housing (7), and a main shaft is sleeved inside the stator (33); The main shaft includes a sleeve (2), inside which a rotor magnet (4) and a short shaft (1) are disposed. A first cover (9) is at least partially fitted inside the sleeve (2). A first bearing (18) is disposed between the first cover (9) and the inner wall of the sleeve (2). A second cover (10) is at least partially fitted inside the sleeve (2). A second bearing (23) is disposed between the second cover (10) and the inner wall of the sleeve (2). Along the axial direction of the sleeve (2), the first cover (9), the rotor magnet (4), the short shaft (1), and the second cover (18) are connected. 10) Sequentially located within the sleeve (2), and the short shaft (1) sequentially passes through the second cover (10) and at least partially extends out of the second cover (10); a first mounting part (17) is provided on the first cover (9), the first mounting part (17) is sleeved within the sleeve (2), and a first bearing (18) is provided between the first mounting part (17) and the inner wall of the sleeve (2); a second mounting part (22) is provided on the second cover (10), the second mounting part (22) is sleeved within the sleeve (2), and the second mounting part (22) and the sleeve (2) are respectively positioned within the sleeve (2). 2) The second bearing (23) is provided between the inner walls of the sleeve (2). Along the axial direction of the sleeve (2), the first mounting part (17), the rotor magnet (4), the short shaft (1) and the second mounting part (22) are located in sequence inside the sleeve (2), and the short shaft (1) passes through the second mounting part (22) and the second cover (10) in sequence; the sleeve (2) includes a first section (26), a second section (27) and a third section (28) connected in sequence. The second section (27) is located between the first section (26) and the third section (28). Along the axial direction of the sleeve (2), The first mounting part (17) is at least partially located in the first segment (26), the rotor magnet (4) is located in the second segment (27), and the second mounting part (22) and the short shaft (1) are located in the third segment (28). A baffle (3) is also provided inside the sleeve (2), the baffle (3) is located between the rotor magnet (4) and the first mounting part (17), the length of the second segment (27) is greater than the sum of the lengths of the first segment (26) and the third segment (28), and the rotor magnet (4) is axially limited by the baffle (3) and the short shaft (1).

2. The motor according to claim 1, characterized in that, The outer wall of the first mounting part (17) is provided with a first fixing member (19), and the first bearing (18) is located between the first fixing member (19) and the first cover (9). The outer wall of the second mounting part (22) is provided with a second fixing member (24), and the second bearing (23) is located between the second fixing member (24) and the second cover (10).

3. The motor according to claim 1, characterized in that, The second cover (10) has a first groove (21) on the side facing away from the stator (33). A diffuser (11) is provided in the first groove (21). Along the axial direction of the sleeve (2), the second mounting part (22) has a second through hole (25). The second through hole (25) is connected to the first groove (21). The short shaft (1) passes through the second through hole (25) and the first groove (21) in sequence. A thrust plate (5) is provided on the short shaft (1). The thrust plate (5) is located between the diffuser (11) and the bottom surface of the first groove (21). A third bearing (13) is provided on the side of the diffuser (11) facing the first groove (21). A fourth bearing (14) is provided in the first groove (21). The third bearing (13) and the fourth bearing (14) are located on both sides of the thrust plate (5).

4. The motor according to claim 3, characterized in that, The short shaft (1) includes a first part (29), a second part (30), a third part (31) and a fourth part (32) connected in sequence. The diameters of the first part (29), the second part (30), the third part (31) and the fourth part (32) decrease in sequence. The first part (29) is located inside the sleeve (2), the second part (30) is located inside the second through hole (25), and the third part (31) and the fourth part (32) extend out of the first groove (21) at least partially.

5. The motor according to claim 3, characterized in that, The first cover (9) is provided with a first through hole (16), an inlet is formed between the diffuser (11) and the short shaft (1), and a first flow channel is formed between the second mounting part (22) and the short shaft (1). The inlet is used for the flow of cooling medium. After the cooling medium flows into the inlet, it can flow through the outer wall of the sleeve (2) and then flow out from the first through hole (16).

6. The motor according to claim 5, characterized in that, A second flow channel is formed between the diffuser (11), the thrust plate (5) and the inner wall of the first groove (21), a third flow channel is formed between the sleeve (2) and the second cover (10), and a fourth flow channel is formed between the sleeve (2) and the stator (33). The inlet, the second flow channel, the first flow channel, the third flow channel, the fourth flow channel and the first through hole (16) are connected in sequence.

7. The motor according to claim 6, characterized in that, Along the axial direction of the sleeve (2), the first mounting part (17) is provided with a second groove (20), the first through hole (16) is connected to the second groove (20), a fifth flow channel is formed between the first mounting part (17) and the sleeve (2), and a sixth flow channel is formed between the sleeve (2) and the first cover (9). The fourth flow channel, the sixth flow channel, and the fifth flow channel are connected in sequence.

8. The motor according to claim 1, characterized in that, The housing (7) is provided with a cooling channel (15), the cooling channel (15) has a first opening and a second opening, the first opening and the second opening are provided on the outer wall of the housing (7), and the cooling channel (15) is arranged in a spiral shape.

9. The motor according to claim 1, characterized in that, The stator (33) is provided with a coil (34). Along the axial direction of the sleeve (2), the length of the coil (34) is not less than the length of the rotor magnet (4). The second cover (10) is provided with a third cover (12) on the side opposite to the housing (7). The main shaft passes through the third cover (12), and the third cover (12) is provided with an air inlet.

10. A compressor, characterized in that, Including the motor as described in any one of claims 1 to 9.

11. The compressor according to claim 10, characterized in that, When the short shaft (1) comprises a first part (29), a second part (30), a third part (31) and a fourth part (32) connected in sequence, an impeller (6) is provided on the fourth part (32).

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