A high-speed permanent magnet synchronous motor and air suspension blower

Abstract

The present invention relates to a high-speed permanent magnet synchronous motor and an air suspension blower, and belongs to the technical field of motor heat dissipation. In the motor, a closed baffle ring is arranged between the stator and the motor housing, which is used to divert the cooling air entering from the motor housing, so that a second heat dissipation duct and a third heat dissipation duct are formed between the stator and the motor housing; and a guide impeller is arranged on the rotor near the front radial air bearing, which is used to guide the air in the front radial air bearing and the first cavity to the first heat dissipation duct; a heat dissipation impeller is also arranged at the tail end of the rotor, which is used to guide the cooling air in each heat dissipation duct to the outside of the motor. The present invention optimizes the design of the heat dissipation duct inside the motor and improves the rotor structure, so as to synergistically improve the heat dissipation effect of the front radial air bearing, stator and rotor inside the motor, greatly reduce the operating temperature of the fan, and has important significance for the temperature operation of air suspension blowers and air suspension air compressors.

Description

Technical Field

[0001] The present invention relates to a high-speed permanent magnet synchronous motor and an air suspension blower, belonging to the technical field of motor heat dissipation. Background Art

[0002] High-speed permanent magnet synchronous motors (PMSMs) have the advantages of high efficiency and high power density and are widely used in industries such as industry and transportation. However, as the motor speed increases, heat dissipation becomes increasingly important.

[0003] Currently, the main cooling methods for high-speed permanent magnet synchronous motors include water cooling, air cooling, or a combination of these. Water cooling offers the advantages of high heat dissipation efficiency, convenient and precise adjustment, and space savings. However, it also suffers from high maintenance costs, complex cooling system design, and poor rotor heat dissipation. While air cooling offers lower costs and a simpler structure, high-speed permanent magnet synchronous motors used in air suspension blowers still suffer from insufficient heat dissipation from the rotor, stator windings, and front radial air bearing, impacting the stable operation of the air suspension fluid system. Summary of the Invention

[0004] In response to the deficiencies in the prior art, the present invention provides a high-speed permanent magnet synchronous motor, which greatly improves the heat dissipation effect of the motor by optimizing the heat dissipation duct and rotor structure of the motor, ensuring stable operation of the motor at high power.

[0005] At the same time, an air suspension blower based on the above-mentioned high-speed permanent magnet synchronous motor is also provided.

[0006] The technical solution of the present invention is:

[0007] A high-speed permanent magnet synchronous motor comprises a motor housing, a rotor is arranged inside the motor housing, and a stator is arranged around the rotor, and a gap between the rotor and the stator serves as a first heat dissipation duct;

[0008] A closed baffle ring is provided between the stator and the motor housing for diverting the cooling air entering from the motor housing; a first air inlet and a second air inlet are provided on the motor housing, and the first air inlet and the second air inlet are respectively located on either side of the closed baffle ring, so that a second heat dissipation duct and a third heat dissipation duct are formed between the stator and the motor housing;

[0009] A first bearing seat and a second bearing seat are provided between the two ends of the rotor and the motor housing, a front radial air bearing is provided between the first bearing seat and the rotor, and a rear radial air bearing is provided between the second bearing seat and the rotor;

[0010] Both ends of the motor housing are open. The left end of the motor housing is provided with an outer end cover and an inner end cover in sequence from the outside to the inside. An axial air thrust bearing is provided between the outer end cover and the inner end cover; and the first bearing seat is fixed on the inner side of the inner end cover; the right end of the motor housing is provided with a rear radial air bearing end cover, and the second bearing seat is fixed on the inner side of the rear radial air bearing end cover;

[0011] A second cavity is formed between the stator, the motor housing and the rear radial air bearing end cover, a first cavity is formed between the stator, the motor housing and the inner end cover, the second heat dissipation duct is connected to the first cavity, the third heat dissipation duct is connected to the second cavity, and the first cavity is connected to the second cavity through the first heat dissipation duct;

[0012] A guide impeller is provided on the rotor near the front radial air bearing, for guiding the air in the front radial air bearing and the first cavity to the first heat dissipation duct;

[0013] A heat dissipation impeller is also provided at the tail end of the rotor to guide the cooling air in each heat dissipation duct to the outside of the motor.

[0014] According to the preferred embodiment of the present invention, a first vent hole is provided on the rear radial air bearing end cover.

[0015] A second volute is provided outside the heat dissipation impeller, a guide cover is provided around the outside of the second volute, a cover is provided at the end of the guide cover, and the outer diameter of the second volute is smaller than the distance from the first vent to the center of the rotor.

[0016] According to a preferred embodiment of the present invention, the rotor includes a permanent magnetic core, a plug, a sleeve, a shaft head and a pull rod, plugs are provided at both ends of the permanent magnetic core, and the outside of the permanent magnetic core and the plug is provided with a sleeve, a boss is provided on the outside of the plug, and the shaft head is sleeved on the outside of the boss;

[0017] One pull rod passes through the shaft head and is threadedly connected to the inside of the boss; the other pull rod passes through the heat dissipation impeller and the shaft head in sequence from the outside to the inside and is threadedly connected to the inside of the boss;

[0018] The front radial air bearing is arranged between the first bearing seat and the shaft head, and the rear radial air bearing is arranged between the second bearing seat and the shaft head;

[0019] The drainage impeller is sleeved on the outside of the boss, and two end faces of the drainage impeller are respectively in contact with the end face of the shaft head and the end face of the plug.

[0020] According to a preferred embodiment of the present invention, the impeller includes a first circular ring and a second circular ring connected to each other, the inner diameter of the first circular ring is the same as the inner diameter of the second circular ring, and the outer diameter of the first circular ring is smaller than the outer diameter of the second circular ring;

[0021] A plurality of blades are provided on the second ring, and the blades are arranged around the circumference of the first ring;

[0022] The first circular ring abuts against the end surface of the shaft head, and the second circular ring abuts against the end surface of the plug.

[0023] Preferably, according to the present invention, the blades are arranged around the circumference of the first ring along a certain angle, which may be 45-60°, and the number of the blades is 6-12.

[0024] According to a preferred embodiment of the present invention, the pull rod includes a threaded portion, a tool-relief groove, a limiting portion and a connecting portion connected in sequence, a positioning portion is further provided between the tool-relief groove and the limiting portion, and the tool-relief groove, the positioning portion and the limiting portion are arranged in a stepped manner;

[0025] The threaded portion is connected to the internal threaded hole of the plug, a positioning hole is provided at the edge of the internal threaded hole, the diameter of the positioning hole is larger than the aperture of the internal threaded hole, the positioning portion and the positioning hole are clearance-matched; the limiting portion abuts against the top of the boss.

[0026] Preferably, according to the present invention, the diameter of the positioning portion is larger than the outer diameter of the threaded portion, and the diameter of the positioning portion is smaller than the diameter of the limiting portion.

[0027] Preferably, according to the present invention, a fourth air inlet is provided at a position of the motor housing near the rear radial air bearing end cover, and / or a third air inlet is provided at a position of the motor housing near the inner end cover; the stator includes a stator core and a stator winding, and the third air inlet corresponds to the position of the stator winding at the left end, or the fourth air inlet corresponds to the position of the stator winding at the right end.

[0028] Preferably, according to the present invention, the area of ​​the first air inlet and the area of ​​the second air inlet are both larger than the area of ​​the third air inlet or the area of ​​the fourth air inlet.

[0029] Preferably, according to the present invention, a first connecting ring and a second connecting ring are further provided on the outside of the stator core, and the first connecting ring and the second connecting ring are located on both sides of the closed retaining ring, the first connecting ring is located close to the inner end cover, and the second connecting ring is located close to the rear radial air bearing end cover, a plurality of second air holes are opened on the first connecting ring, and a plurality of third air holes are also opened on the second connecting ring.

[0030] Preferably, according to the present invention, the motor housing is provided with a plurality of heat dissipation grooves.

[0031] On the other hand, the present invention also provides an air suspension blower based on the high-speed permanent magnet synchronous motor, comprising the above-mentioned high-speed permanent magnet synchronous motor, a first fan impeller and a first volute, the first fan impeller being mounted on the left end of the rotor, the first volute being mounted on the outside of the first fan impeller, and the first volute being fixed to the outside of the outer end cover.

[0032] The beneficial effects of the present invention are:

[0033] 1. The present invention provides a high-speed permanent magnet synchronous motor. By optimizing the design of the heat dissipation duct inside the motor and improving the rotor structure, the heat dissipation effect of the front radial air bearing, stator, and rotor inside the motor is synergistically improved, thereby greatly reducing the operating temperature of the fan. This is of great significance for the temperature operation of air suspension blowers and air suspension air compressors.

[0034] 2. By opening a first air inlet and a second air inlet on the motor housing and setting a closed baffle ring between the stator and the motor housing, a second heat dissipation duct and a third heat dissipation duct are formed between the motor housing and the stator, thereby enhancing the heat dissipation effect of the stator winding and the rotor, especially improving the heat dissipation effect of the right-end stator end winding.

[0035] 3. The present invention provides a pull-rod rotor structure. By arranging a drainage impeller on the rotor structure, it can not only drain the gas in the front radial air bearing, thereby reducing the temperature of the front radial air bearing; but also more effectively guide the airflow inside the first cavity, thereby enhancing the heat dissipation effect of the left-end stator winding; and improve the overall heat dissipation efficiency of the high-speed permanent magnet synchronous motor.

[0036] 4. By providing a positioning portion between the tool withdrawal groove and the limiting portion of the pull rod, the position of the pull rod can be limited from both the axial and radial angles of the rotor, thereby improving the concentricity of the permanent magnet core in the rotor and the pull rods at both ends, which is beneficial to the stable operation of the motor, reduces maintenance costs, and increases the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a structural schematic diagram of the air suspension blower provided by the present invention using a high-speed permanent magnet synchronous motor.

[0038] Figure 2 This is a schematic diagram of the three-dimensional structure of the rotor structure provided by the present invention.

[0039] Figure 3 This is a schematic structural diagram of the rotor structure provided by the present invention.

[0040] Figure 4 This is a schematic structural diagram of the drainage impeller provided by the present invention.

[0041] Figure 5 This is a schematic structural diagram of the stator core provided by the present invention.

[0042] Figure 6 The present invention provides Figure 1 Enlarged schematic diagram of position A in the middle.

[0043] Figure 7 It is a partial enlarged schematic diagram of the structure of the pull rod provided by the present invention.

[0044] Figure 8 It is a schematic diagram of the three-dimensional structure of the pull rod provided by the present invention.

[0045] 1. Rotor, 2. Stator, 3. Motor housing, 4. Stator core, 5. Stator winding, 6. First cooling duct, 7. First air inlet, 8. Second air inlet, 9. Third air inlet, 10. Fourth air inlet, 11. Cooling impeller, 12. Second vent, 13. Third vent, 14. Second volute, 15. Axial air thrust bearing, 16. Inner end cover, 17. Rear radial air bearing end cover, 18. Second cooling duct, 19. Third cooling duct, 20. First vent, 21. First volute, 22. First fan impeller, 23. First connecting ring, 2 4. Second connecting ring, 25. Air guide cover, 26. Cover plate, 27. Closed baffle ring, 28. Heat dissipation groove, 29. Thrust plate, 30. Shaft head, 31. Impeller, 32. Plug, 33. Sleeve, 34. Permanent magnetic core, 35. Pull rod, 36. Front radial air bearing, 37. First bearing seat, 38. Threaded portion, 39. Back-off groove, 40. Positioning portion, 41. Limiting portion, 42. Connecting portion, 43. Positioning hole, 44. Blade, 45. First circular ring, 46. Second circular ring, 47. Rear radial air bearing, 48. Second bearing seat, 49. Outer end cover. DETAILED DESCRIPTION

[0046] Several embodiments of the present application will be disclosed below with diagrams to clearly and completely describe the technical solution of the present invention. The drawings that constitute part of the specification of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] It should be noted that unless the directions are defined separately, the directions such as up, down, left, and right mentioned in this document are based on the embodiments of this application. Figure 1 The directions of up, down, left, and right shown are used as the reference. If the specific posture changes, the directional indication will also change accordingly. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are simply used to distinguish different components. In addition, in various embodiments of the present disclosure, the same or similar reference numerals represent the same or similar components.

[0048] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "connection" can refer to a fixed connection, a detachable connection, or an integral connection, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0049] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] Example 1

[0051] A high-speed permanent magnet synchronous motor is described in the embodiment by taking the structural diagram of an air suspension blower using the high-speed permanent magnet synchronous motor as an example. Figure 1 As shown, it includes a motor housing 3, a stator 2, a rotor 1, a heat dissipation impeller 11, and a drainage impeller 31.

[0052] The motor housing 3 is provided with a rotor 1 and a stator 2 surrounding the rotor 1. The gap between the rotor 1 and the stator 2 is a first heat dissipation duct 6.

[0053] A closed baffle ring 27 is provided between the stator 2 and the motor housing 3 to divert the cooling air entering through the motor housing 3, dividing the air duct between the motor housing 3 and the stator 2 into two sections: a second cooling air duct 18 and a third cooling air duct 19. The motor housing 3 is provided with a first air inlet 7 and a second air inlet 8, located on either side of the closed baffle ring 27, forming the second cooling air duct 18 and the third cooling air duct 19 between the stator 2 and the motor housing 3.

[0054] A first bearing seat 37 and a second bearing seat 48 are provided between the two ends of the rotor 1 and the motor housing 3. A front radial air bearing 36 is provided between the first bearing seat 37 and the rotor 1, and a rear radial air bearing 47 is provided between the second bearing seat 48 and the rotor 1.

[0055] Both ends of the motor housing 3 are open. The left end of the motor housing 3 is provided with an outer end cover 49 and an inner end cover 16 in sequence from the outside to the inside. The outer end cover 49 and the inner end cover 16 are both sleeved on the outside of the rotor 1. An axial air thrust bearing 15 is provided between the outer end cover 49 and the inner end cover 16. The axial air thrust bearing 15 includes a thrust disc 29 and axial bearing seats and foils provided on both sides of the thrust disc 29; and the first bearing seat 37 is fixed to the inner side of the inner end cover 16; the right end of the motor housing 3 is provided with a rear radial air bearing end cover 17, and the second bearing seat 48 is fixed to the inner side of the rear radial air bearing end cover 17, and the rear radial air bearing end cover 17 is also sleeved on the outside of the rotor 1;

[0056] A second cavity is formed between the stator 2, the motor housing 3 and the rear radial air bearing end cover 17. A first cavity is formed between the stator 2, the motor housing 3 and the inner end cover 16. The second heat dissipation duct 18 is connected to the first cavity, the third heat dissipation duct 19 is connected to the second cavity, and the first cavity is connected to the second cavity through the first heat dissipation duct 6.

[0057] A guide impeller 31 is provided on the rotor 1 near the front radial air bearing 36 to guide the air in the front radial air bearing 36 and the first cavity to the first heat dissipation duct 6;

[0058] A heat dissipation impeller 11 is also provided at the tail end of the rotor 1 for directing the cooling air in each heat dissipation air duct to the outside of the motor.

[0059] The working process of the above-mentioned high-speed permanent magnet synchronous motor is as follows: after the motor is powered on, the rotor 1 drives the heat dissipation impeller 11 at the tail end of the rotor 1 to rotate, generating negative pressure at the small end of the heat dissipation impeller 11, and the heat dissipation impeller 11 is connected to the interior of the motor housing 3, so that a negative pressure environment is generated inside the motor housing 3.

[0060] Under the influence of negative pressure, external cooling air passes through the first air inlet 7 and enters the second cooling duct 18 between the motor housing 3 and the stator 2. It then enters the first cavity, cooling the stator winding 5 on the left side of the cavity. Simultaneously, under the action of the induced impeller 31, the cooling air is accelerated into the first cooling duct 6, enhancing the cooling of the left-end stator winding 5 and the rotor 1. Furthermore, the induced impeller 31 directs the hot air in the front radial air bearing 36 into the first cooling duct 6, cooling the front radial air bearing 36. After flowing through the first cooling duct 6, the cooling air enters the second cavity, cooling the stator winding 5 on the right side.

[0061] Under the action of negative pressure, the external cooling air enters the third heat dissipation duct 19 between the motor housing 3 and the stator 2 through the second air inlet 8 to cool the stator core 4, and then enters the second cavity to merge with the cooling air flowing through the first heat dissipation duct 6, cooling the stator winding 5 at the right end of the cavity.

[0062] Finally, the cooling air in the second cavity passes through the first vent holes 20 provided on the rear radial air bearing end cover 17 and enters the air guide cover 25 .

[0063] Example 2

[0064] This embodiment provides a high-speed permanent magnet synchronous motor, which differs from the first embodiment in that:

[0065] The rear radial air bearing end cover 17 is provided with a first vent hole 20.

[0066] A second volute 14 is provided outside the heat dissipation impeller 11 , and a deflector 25 is provided around the outside of the second volute 14 . A cover 26 is provided at the end of the deflector 25 , and the outer diameter of the second volute 14 is smaller than the distance from the first vent 20 to the center of the rotor 1 .

[0067] The cooling air in the second cavity flows into the interior of the guide cover 25 through the first air vent 20, and then enters the gap between the second volute 14 and the small end of the heat dissipation impeller 11. After being compressed by the heat dissipation impeller 11, it is output from the gap between the large end of the heat dissipation impeller 11 and the second volute 14 and discharged to the outside of the motor.

[0068] Example 3

[0069] This embodiment provides a high-speed permanent magnet synchronous motor, which differs from the first embodiment in that:

[0070] like Figure 3 and Figure 2 As shown, the rotor 1 includes a permanent magnetic core 34, a plug 32, a sleeve 33, a shaft head 30 and a pull rod 35. The plugs 32 are provided at both ends of the permanent magnetic core 34, and the sleeve 33 is provided outside the permanent magnetic core 34 and the plug 32. A boss is provided outside the plug 32, and the shaft head 30 is sleeved outside the boss.

[0071] The right pull rod 35 passes through the shaft head 30 and is threadedly connected to the inside of the boss; the right pull rod 35 passes through the heat dissipation impeller 11 and the shaft head 30 in sequence from the outside to the inside and is threadedly connected to the inside of the boss;

[0072] The front radial air bearing 36 is disposed between the first bearing seat 37 and the shaft head 30 , and the rear radial air bearing 47 is disposed between the second bearing seat 48 and the shaft head 30 ;

[0073] The drainage impeller 31 is sleeved on the outside of the boss, and two end faces of the drainage impeller 31 are respectively in contact with the end face of the shaft head 30 and the end face of the plug 32 .

[0074] Example 4

[0075] This embodiment provides a high-speed permanent magnet synchronous motor, which differs from the third embodiment in that: Figure 3 and Figure 2 As shown, the impeller 31 includes a first circular ring 45 and a second circular ring 46 connected to each other. The inner diameter of the first circular ring 45 is the same as the inner diameter of the second circular ring 46, and the outer diameter of the first circular ring 45 is smaller than the outer diameter of the second circular ring 46.

[0076] A plurality of blades 44 are provided on the second ring 46, and the blades 44 are arranged around the circumference of the first ring 45 along a certain angle;

[0077] The first circular ring 45 abuts against the end surface of the shaft head 30 , and the second circular ring 46 abuts against the end surface of the plug 32 .

[0078] For better drainage and heat dissipation, the inner diameter of the blades 44 in the drainage impeller 31 is greater than or equal to the outer diameter of the shaft head 30 , and the outer diameter of the blades 44 is less than or equal to the outer diameter of the sheath 33 .

[0079] Example 5

[0080] This embodiment provides a high-speed permanent magnet synchronous motor, which differs from the fourth embodiment in that:

[0081] The blades 44 are arranged around the circumference of the first ring 45 at an angle of 45°-60°, and the number of the blades 44 is 6-12. Figure 4 This is one of the design solutions for the angle and number of blades 44.

[0082] Example 6

[0083] This embodiment provides a high-speed permanent magnet synchronous motor, which differs from the third embodiment in that:

[0084] like Figure 6 、 Figure 7 and Figure 8 As shown, the pull rod 35 includes a threaded portion 38, a tool undercut 39, a limiting portion 41 and a connecting portion 42 connected in sequence. The threaded portion 38, the tool undercut 39, the limiting portion 41 and the connecting portion 42 are an integrally formed structure. A positioning portion 40 is further provided between the tool undercut 39 and the limiting portion 41. The tool undercut 39, the positioning portion 40 and the limiting portion 41 are arranged in a stepped manner.

[0085] The threaded portion 38 penetrates into the plug 32 and is connected to the internal threaded hole of the plug 32. Figure 6 As shown, a positioning hole 43 is provided at the edge of the internal threaded hole. The diameter of the positioning hole 43 is larger than the aperture of the internal threaded hole. The positioning portion 40 is loosely matched with the positioning hole 43. The limiting portion 41 abuts against the top of the boss.

[0086] Since the threaded portion 38 is threadedly connected to the inside of the boss, the concentricity of the pull rod 35 and the permanent magnet core 34 is affected. In order to reduce the concentricity deviation caused by the threaded connection, the cooperation between the limiting portion 41 and the boss can limit the radial direction of the pull rod 35, and the clearance cooperation between the positioning portion 40 and the positioning hole 43 can limit the axial direction of the pull rod 35.

[0087] Example 7

[0088] This embodiment provides a high-speed permanent magnet synchronous motor, which differs from the sixth embodiment in that:

[0089] like Figure 7 As shown, the diameter of the positioning portion 40 is larger than the outer diameter of the threaded portion 38 , and the diameter of the positioning portion 40 is smaller than the diameter of the limiting portion 41 .

[0090] Example 8

[0091] This embodiment provides a high-speed permanent magnet synchronous motor, which differs from the first embodiment in that:

[0092] like Figure 1 As shown, the motor housing 3 has a fourth air inlet 10 near the rear radial air bearing end cap 17, and / or the motor housing 3 has a third air inlet 9 near the inner end cap 16. The stator 2 includes a stator core 4 and a stator winding 5. The third air inlet 9 corresponds to the position of the stator winding 5 at the left end, or the fourth air inlet 10 corresponds to the position of the stator winding 5 at the right end. The third air inlet 9 and the fourth air inlet 10 can be selectively provided on the motor housing 3 based on the different heat dissipation characteristics of motors of different power.

[0093] Example 9

[0094] This embodiment provides a high-speed permanent magnet synchronous motor, which differs from the eighth embodiment in that:

[0095] The areas of the first air inlet 7 and the second air inlet 8 are both larger than the areas of the third air inlet 9 or the fourth air inlet 10. This is beneficial for the efficient flow and heat dissipation of cooling air, allowing more air to flow through the stator 2 and the rotor 1.

[0096] Example 10

[0097] This embodiment provides a high-speed permanent magnet synchronous motor, which differs from the first embodiment in that:

[0098] like Figure 5As shown, a first connecting ring 23 and a second connecting ring 24 are further provided on the outside of the stator core 4. The first connecting ring 23 and the second connecting ring 24 are located on either side of the closed retaining ring 27. The first connecting ring 23 is located near the inner end cover 16, and the second connecting ring 24 is located near the rear radial air bearing end cover 17. The first connecting ring 23 is provided with a plurality of second vent holes 12, and the second connecting ring 24 is also provided with a plurality of third vent holes 13. The provision of the first connecting ring 23 and the second connecting ring 24 can better ensure the concentricity of the rotor 1 and the stator 2.

[0099] In addition, the motor housing 3 may be provided with a plurality of heat dissipation grooves 28 to increase the heat dissipation effect of the heat dissipation duct between the motor housing 3 and the stator 2.

[0100] Example 11

[0101] The present invention also provides an air suspension blower based on a high-speed permanent magnet synchronous motor, such as Figure 1 As shown, it includes the above-mentioned high-speed permanent magnet synchronous motor, a first fan impeller 22 and a first volute 21. The first fan impeller 22 is mounted on the left end of the rotor 1, and the first volute 21 is mounted on the outside of the first fan impeller 22. The first volute 21 is fixed to the outside of the outer end cover 49. Specifically, one end of the first fan impeller 22 is mounted on the outside of the boss in the corresponding shaft head 30. A groove is formed between the air-cooled impeller and the corresponding shaft head 30, and the thrust plate 29 is mounted in the groove.

[0102] The foregoing description shows and describes preferred embodiments of the present application. However, as previously mentioned, it should be understood that the present application is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present application may be used in various other combinations, modifications, and environments, and may be modified within the contemplation of the present invention through the teachings above or through techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present application shall be within the scope of protection of the appended claims.

Claims

1. A high-speed permanent magnet synchronous motor, characterized in that: The invention comprises a motor housing, wherein a rotor and a stator arranged around the rotor are arranged inside the motor housing, and a gap between the rotor and the stator is a first heat dissipation duct; a closed baffle ring is arranged between the stator and the motor housing, the stator comprises a stator core and a stator winding, and a first connecting ring and a second connecting ring are also arranged outside the stator core, and the first connecting ring and the second connecting ring are located on both sides of the closed baffle ring, the first connecting ring is located near the inner end cover, and the second connecting ring is located near the rear radial air bearing end cover, a plurality of second vents are provided on the first connecting ring, and a plurality of third vents are also provided on the second connecting ring; a first air inlet and a second air inlet are arranged on the motor housing, and the first air inlet and the second air inlet are respectively located on both sides of the closed baffle ring, so that a second heat dissipation duct and a third heat dissipation duct are formed between the stator and the motor housing; A first bearing seat and a second bearing seat are arranged between the two ends of the rotor and the motor housing, a front radial air bearing is arranged between the first bearing seat and the rotor, and a rear radial air bearing is arranged between the second bearing seat and the rotor; the two ends of the motor housing are open, and an outer end cover and an inner end cover are arranged on the left end of the motor housing from the outside to the inside, and an axial air thrust bearing is arranged between the outer end cover and the inner end cover; and the first bearing seat is fixed on the inner side of the inner end cover; a rear radial air bearing end cover is arranged on the right end of the motor housing, and the second bearing seat is fixed on the inner side of the rear radial air bearing end cover; the stator, A second cavity is formed between the motor housing and the rear radial air bearing end cover, a first cavity is formed between the stator, the motor housing and the inner end cover, the second heat dissipation duct is connected to the first cavity, the third heat dissipation duct is connected to the second cavity, and the first cavity is connected to the second cavity through the first heat dissipation duct; a draught impeller is arranged on the rotor near the front radial air bearing, which is used to direct the air in the front radial air bearing and the first cavity to the first heat dissipation duct; a heat dissipation impeller is also arranged at the tail end of the rotor, which is used to direct the cooling air in each heat dissipation duct to the outside of the motor.

2. A high-speed permanent magnet synchronous motor according to claim 1, characterized in that: A first air vent is arranged on the rear radial air bearing end cover, a second volute is arranged outside the heat dissipation impeller, a guide cover is arranged around the outside of the second volute, a cover plate is arranged at the end of the guide cover, and the outer diameter of the second volute is smaller than the distance from the first air vent to the center of the rotor.

3. A high-speed permanent magnet synchronous motor according to claim 1, characterized in that: The rotor includes a permanent magnetic core, a plug, a sleeve, a shaft head and a pull rod. Plugs are arranged at both ends of the permanent magnetic core, and the outside of the permanent magnetic core and the plug is arranged with a sleeve. A boss is arranged on the outside of the plug, and the shaft head is sleeved on the outside of the boss; a pull rod passes through the shaft head and is threadedly connected with the inside of the boss; the other pull rod passes through the heat dissipation impeller and the shaft head from the outside to the inside in sequence, and is threadedly connected with the inside of the boss; the front radial air bearing is arranged between the first bearing seat and the shaft head, and the rear radial air bearing is arranged between the second bearing seat and the shaft head; the drainage impeller is sleeved on the outside of the boss, and the two end faces of the drainage impeller are respectively abutted against the end face of the shaft head and the end face of the plug.

4. A high-speed permanent magnet synchronous motor according to claim 3, characterized in that: The impeller includes a first circular ring and a second circular ring which are connected to each other. The inner diameter of the first circular ring is the same as the inner diameter of the second circular ring, and the outer diameter of the first circular ring is smaller than the outer diameter of the second circular ring. A plurality of blades are arranged on the second circular ring, and the blades are arranged around the circumference of the first circular ring. The first circular ring abuts against the end face of the shaft head, and the second circular ring abuts against the end face of the plug.

5. A high-speed permanent magnet synchronous motor according to claim 3, characterized in that: The pull rod comprises a threaded portion, a tool-retracting groove, a limiting portion and a connecting portion which are connected in sequence, a positioning portion is further arranged between the tool-retracting groove and the limiting portion, and the tool-retracting groove, the positioning portion and the limiting portion are arranged in a stepped manner; The threaded portion is connected to the internal threaded hole of the plug, a positioning hole is provided at the edge of the internal threaded hole, the diameter of the positioning hole is larger than the aperture of the internal threaded hole, the positioning portion and the positioning hole are clearance-matched; the limiting portion abuts against the top of the boss.

6. A high-speed permanent magnet synchronous motor according to claim 5, characterized in that: The diameter of the positioning portion is larger than the outer diameter of the threaded portion, and the diameter of the positioning portion is smaller than the diameter of the limiting portion.

7. A high-speed permanent magnet synchronous motor according to claim 1, characterized in that: A fourth air inlet is provided at a position of the motor housing near the rear radial air bearing end cover, and / or a third air inlet is provided at a position of the motor housing near the inner end cover; the third air inlet corresponds to the position of the stator winding at the left end, or the fourth air inlet corresponds to the position of the stator winding at the right end.

8. A high-speed permanent magnet synchronous motor according to claim 7, characterized in that: The area of ​​the first air inlet and the area of ​​the second air inlet are both greater than the area of ​​the third air inlet or the area of ​​the fourth air inlet.

9. An air suspension blower, characterized in that: It comprises a high-speed permanent magnet synchronous motor as described in any one of claims 1 to 8, a first fan impeller and a first volute, wherein the first fan impeller is mounted on the left end of the rotor, the first volute is mounted on the outside of the first fan impeller, and the first volute is fixed on the outside of the outer end cover.

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