Motor and air blower

Abstract

The motor comprises a shell, a motor stator assembly and a motor rotor assembly, the motor stator assembly comprises a stator iron core and a stator winding, the motor rotor assembly comprises a rotating shaft and a rotor iron core, and a cooling airflow outlet penetrating through the inner side and the outer side of the shell in the radial direction of the shell is formed in the shell. A first airflow leading-in part, a second airflow leading-in part and a third airflow leading-in part which penetrate through the inner side and the outer side of the shell are further formed on the shell, the first airflow leading-in part and the second airflow leading-in part are arranged corresponding to the ends of the stator winding respectively, and a stator cooling flow channel penetrating in the radial direction of the stator iron core is formed in the stator iron core. Air flow outside the shell can enter the end portion area of the stator winding through the first air flow leading-in portion and the second air flow leading-in portion, enter the stator and rotor air gap through the stator cooling flow channel through the third air flow leading-in portion and finally flow out through the cooling air flow outlet. According to the invention, the energy consumption of the whole machine can be reduced while high-efficiency cooling of each heating component is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of motor design, and particularly relates to a motor and a blower. BACKGROUND

[0002] The air-suspended centrifugal blower (i.e., a blower with an air-suspended bearing) is an advanced gas conveying and compression technology that directly drives a high-speed permanent magnet synchronous motor in an oil-free operation mode. The air-suspended centrifugal blower has the characteristics of high efficiency, high performance, low noise and low energy consumption, and thus exhibits excellent efficiency and reliability in the industrial gas conveying field. The air-suspended centrifugal blower is widely used in the sewage treatment, papermaking and printing, chemical industry, pneumatic conveying and other industries.

[0003] With the increase of the motor speed, the stator iron loss, the winding copper loss and the eddy current loss on the surface of the rotor are significantly increased. The wind abrasion loss of the air-suspended bearing of the air-suspended motor is also increased. The cooling of the super-speed motor has high requirements for the motor stator, the end winding, the high-speed rotating shaft and the air-suspended bearing. The existing cooling air duct structure of the blower is often used for cooling only part of the components in the motor, such as the stator core and the end winding. Therefore, the high-speed rotating shaft is not well cooled, and the demagnetization risk of the rotating shaft exists. For example, while meeting the effective cooling of the high-speed rotating shaft, the effective cooling of the end winding of the stator is not considered, which leads to high temperature rise of the end winding and safety hazards. It is worth noting that in the prior art, the internal cooling of the motor and the corresponding blower is mainly driven by the cooling air flow along the axial direction of the motor rotor. Due to the small size of the axial extension of the stator-rotor air gap in the main flow path, the flow resistance is extremely large, which leads to high energy consumption of the whole machine. In order to ensure the overall energy efficiency, the heat dissipation power of part of the components is reduced, and the overall cooling effect of the heat source components such as the motor rotor, the stator core and the stator winding is limited. SUMMARY

[0004] Therefore, the application provides a motor and a blower, which can overcome the defects in the related art that the cooling air flow is driven to flow along the axial direction of the motor rotor, the flow path of the cooling air flow includes the small-size axial extension of the stator-rotor air gap, the flow resistance is extremely large, the energy consumption of the whole machine is high, and the cooling effect of the components such as the motor rotor, the stator core and the stator winding is limited.

[0005] To address the aforementioned problems, the present invention provides an electric motor, including a housing and a stator assembly and a rotor assembly assembled within the housing. The stator assembly includes a stator core and a stator winding wound around the stator core. The rotor assembly includes a shaft and a rotor core sleeved on the shaft. A stator-rotor air gap is formed between the stator core and the rotor core. A cooling airflow outlet is formed on the housing, extending radially through its inner and outer sides. The housing also has a first airflow inlet, a second airflow inlet, and a third airflow inlet extending radially through its inner and outer sides. The first and second airflow inlets protrude from the stator windings of the stator core. The two ends of the core are arranged in a corresponding manner. A stator cooling channel is formed on the stator core and runs through it radially. The third airflow inlet is located in the area between the first airflow inlet and the second airflow inlet. In the axial direction of the rotating shaft, the cooling airflow outlet is located between the first airflow inlet and the second airflow inlet. When the cooling airflow outlet is drawn in, the airflow outside the outer casing can enter the end area of ​​the stator winding through the first airflow inlet and the second airflow inlet. The airflow outside the outer casing can also enter the stator-rotor air gap in sequence through the third airflow inlet and the stator cooling channel, and finally flow out through the cooling airflow outlet.

[0006] In some embodiments, the first airflow inlet includes a first inlet, the second airflow inlet includes a second inlet, and the third airflow inlet includes a third inlet, wherein at least one of the first inlet, the second inlet, and the third inlet extends radially along the housing.

[0007] In some embodiments, the flow area of ​​each first inlet in the first airflow inlet increases in the direction away from the cooling airflow outlet; and / or, the flow area of ​​each second inlet in the second airflow inlet increases in the direction away from the cooling airflow outlet; and / or, the flow area of ​​each third inlet in the third airflow inlet increases in the direction away from the cooling airflow outlet.

[0008] In some embodiments, the spacing between the first inlets in the first airflow inlet in the circumferential direction of the housing increases in a direction away from the cooling airflow outlet; and / or, the spacing between the second inlets in the second airflow inlet in the circumferential direction of the housing increases in a direction away from the cooling airflow outlet; and / or, the spacing between the third inlets in the third airflow inlet in the circumferential direction of the housing increases in a direction away from the cooling airflow outlet.

[0009] In some embodiments, between the third inlet and the first inlet, which are equidistant from the cooling airflow outlet, the flow area of ​​the third inlet is greater than that of the first inlet.

[0010] In some embodiments, the third inlet is located at the midpoint of the length of the stator core; and / or, a plane perpendicular to the rotation axis of the rotating shaft and passing through the midpoint of the axial length of the stator core is a first plane, and each first inlet in the first airflow inlet and each second inlet in the second airflow inlet are symmetrical about the first plane.

[0011] In some embodiments, a supporting arc segment is formed within the cooling airflow outlet, which abuts against the outer circumferential wall of the stator core. The supporting arc segment divides the cooling airflow outlet into a first outlet corresponding to the position of the first airflow inlet and a second outlet corresponding to the position of the second airflow inlet.

[0012] In some embodiments, both the cooling air outlet and the supporting arc segment are symmetrical about the first plane.

[0013] In some embodiments, an annular connecting groove is formed on the inner wall of the housing, and the stator cooling channels are multiple, each of the stator cooling channels and each of the third inlets are connected to the annular connecting groove, and the annular connecting groove has a portion located on the inner wall surface of the supporting arc segment.

[0014] In some embodiments, the stator core includes a first core segment, a second core segment, and an intermediate core segment disposed along the axial direction of the rotating shaft, wherein the intermediate core segment is made of a non-magnetic material, and each of the stator cooling channels is formed on the intermediate core segment.

[0015] In some embodiments, the first inlet has a plurality of ports, each of which is evenly spaced around the axis of rotation of the rotating shaft; and / or, the second inlet has a plurality of ports, each of which is evenly spaced around the axis of rotation of the rotating shaft; and / or, the third inlet has a plurality of ports, each of which is evenly spaced around the axis of rotation of the rotating shaft.

[0016] In some embodiments, the cooling airflow outlet has a flange that protrudes radially outward along the housing, the flange having a protrusion height of h, and the outer diameter of the housing being D, where 1.13 ≤ (D + h) / D ≤ 1.4.

[0017] The present invention also provides a blower, including the motor described above. The two ends of the housing are respectively provided with a first end plate and a second end plate. The side of the first end plate away from the housing is provided with a first diffuser plate and a first volute assembled on the first diffuser plate. The end of the rotating shaft inside the first volute is provided with a first turbine. The rotating shaft is provided with an axial air suspension bearing, which is located between the first diffuser plate and the first end plate. The first end plate is formed with an end plate cooling inlet and an end plate cooling outlet, wherein the end plate cooling outlet is located on the side of the end plate cooling inlet closer to the cooling airflow outlet.

[0018] In some embodiments, the cooling airflow outlet is connected to the air intake of the air compression chamber formed by the first volute.

[0019] The electric motor and blower provided by this invention have the following beneficial effects: On the one hand, the first airflow inlet, the second airflow inlet, and the third airflow inlet are used to provide targeted cooling and heat dissipation for the two ends of the stator winding, the stator core, and the motor rotor assembly, respectively. This provides more comprehensive cooling for the heat-generating components inside the housing and effectively prevents safety hazards and reduced motor performance caused by excessive local temperature rise. On the other hand, this application uses a cooling airflow outlet that extends radially through the housing. By driving the airflow through the outlet, air from outside the housing can enter the housing in parallel through the airflow inlets to cool the corresponding heat-generating components. In particular, the first and second airflow inlets are positioned to correspond to the end regions of the stator winding, which can significantly reduce the flow resistance of the cooling airflow. Meanwhile, the cooling airflow introduced by the third airflow inlet can be split along the air gap between the stator and rotor towards the two ends of the stator core, which also reduces the flow path length of the cooling airflow to a certain extent. Thus, while achieving efficient cooling of each heat-generating component, the overall energy consumption of the machine can be reduced. Each airflow inlet section is equipped with multiple inlets around the rotating shaft to achieve multi-point introduction of cooling airflow in the circumferential direction of the outer casing, ensuring uniform cooling. At the same time, the multiple inlets can further reduce the flow resistance of the cooling airflow and further reduce the overall energy consumption of the machine. The cooling air outlet is located in the top area of ​​the housing. The first inlet, the second inlet and the third inlet are arranged at intervals from top to bottom along the wall of the housing, and the flow area of ​​each inlet is larger as it goes down. This makes the flow resistance of the airflow introduced at the location with a larger distance from the cooling air outlet smaller, ensuring sufficient cooling and heat dissipation for the heat-generating components that are far away from the cooling air outlet. The spacing between adjacent inlets decreases as it moves away from the cooling airflow outlet, meaning the density of inlets increases. Correspondingly, given that the flow area of ​​each inlet is equal, the more inlets there are and the larger the flow area, the better for adequately cooling and dissipating heat from heat-generating components that are far from the cooling airflow outlet. Since the cooling airflow introduced by the third inlet needs to flow through the stator-rotor air gap with a smaller gap, the flow area of ​​each third inlet is made larger than that of the first inlet with the same height, so as to minimize the airflow resistance of the parallel cooling branch and thus improve the cooling effect on the stator core and motor rotor assembly. By setting a support arc segment inside the cooling airflow outlet, the inner wall surface of the support arc segment is concentric with the inner wall surface of the outer shell and has the same radius, thus forming a reliable limit for the stator core, preventing damage to the stator core and outer shell that may be caused by uneven circumferential force on the stator core and excessive local stress. The first inlet, the second inlet, and the cooling air outlet are all symmetrical about the first plane, so that the flow path of the cooling air introduced by each inlet is symmetrical about the first plane. This can reduce the turbulence caused by the asymmetry and uncertainty of the airflow direction, further reduce the airflow resistance, and reduce energy consumption. A non-magnetic intermediate core section is provided between the first and second magnetic core sections, and each stator cooling channel is formed on the intermediate core section, which can prevent eddy current losses caused by constructing stator cooling channels on the magnetic material. Compared to the technical approach of setting up a separate suction component for the cooling airflow outlet, this technical solution can achieve self-priming by utilizing the rotation of the motor itself, eliminating the need for an external cooling fan, saving manufacturing costs, and saving space for motor layout. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the internal structure of the blower in an embodiment of the present invention. The arrows in the diagram indicate the flow path of the cooling airflow. Figure 2 yes Figure 1 A three-dimensional structural diagram of the outer shell; Figure 3 yes Figure 1 A schematic diagram of the cross-section on the first plane.

[0022] The attached figures are labeled as follows: 1. Outer shell; 11. Cooling air outlet; 111. Support arc segment; 12. First inlet; 13. Second inlet; 14. Third inlet; 15. Annular connecting groove; 21. Stator core; 22. Stator winding; 211. Stator cooling channel; 31. Shaft; 32. Rotor core; 41. First end plate; 411. End plate cooling inlet; 412. End plate cooling outlet; 42. Second end plate; 51. First diffuser plate; 52. First volute; 521. First intake port; 53. First turbine; 61. Axial air suspension bearing; 62. Radial air suspension bearing; 71. Second volute; 711. Second intake port; 72. Second turbine; 8. Lead-out sleeve. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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° or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0026] 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.

[0027] See also Figures 1 to 3As shown, according to an embodiment of the present invention, an electric motor is provided, including a housing 1 and a motor stator assembly (not labeled) and a motor rotor assembly (not labeled) assembled within the housing 1. The motor stator assembly includes a stator core 21 and a stator winding 22 wound on the stator core 21. The motor rotor assembly includes a shaft 31 and a rotor core 32 sleeved on the shaft 31. It is understood that the motor rotor assembly can be an electric spindle, which has a corresponding permanent magnet (not shown) embedded in the rotor core 32. The stator core 21 is fitted to the rotor core 32 radially outward, forming a stator-rotor air gap between the stator core 21 and the rotor core 32. The outer casing 1 has a cooling airflow outlet 11 that extends radially through its inner and outer sides. In one specific embodiment, the outer casing 1 is a cylindrical body, and the cooling airflow outlet 11 is formed on the circumferential wall of the cylindrical body. The outer casing 1 also has a first airflow inlet (not indicated in the figure), a second airflow inlet (not indicated in the figure), and a third airflow inlet (not indicated in the figure) extending through its inner and outer sides. The first and second airflow inlets are respectively provided corresponding to the two ends of the stator winding 22 protruding from the stator core 21. A stator cooling channel 211 is formed on the stator core 21, extending radially through it. The third airflow inlet is located in the area between the first and second airflow inlets. Across the axial direction of the rotating shaft 31, the cooling airflow outlet 11 is located between the first and second airflow inlets. When the cooling airflow is drawn in at the cooling airflow outlet 11, the outer casing... 1. External airflow can enter the end region of the stator winding 22 through the first airflow inlet and the second airflow inlet. That is, the first airflow inlet and the second airflow inlet can respectively form targeted cooling for both ends of the stator winding 22. The airflow outside the housing 1 can also enter the stator-rotor air gap through the third airflow inlet and the stator cooling channel 211 in sequence, and finally flow out through the cooling airflow outlet 11. That is, the third airflow inlet can form targeted cooling for the stator core 21 and the motor rotor assembly.

[0028] In this technical solution, on the one hand, the first airflow inlet, the second airflow inlet, and the third airflow inlet are used to provide targeted cooling and heat dissipation for the two ends of the stator winding 22, the stator core 21, and the motor rotor assembly, respectively. This provides more comprehensive cooling for the heat-generating components inside the housing 1 and effectively prevents safety hazards and reduced motor performance caused by excessive local temperature rise. On the other hand, this application uses a cooling airflow outlet 11 that extends radially through the housing 1. By driving airflow suction at the cooling airflow outlet 11, air outside the housing 1 can enter the housing 1 in parallel through each airflow inlet to cool the corresponding heat-generating components. In particular, the first and second airflow inlets are positioned to correspond to the end regions of the stator winding 22, which can significantly reduce the flow resistance of the cooling airflow. At the same time, the cooling airflow introduced by the third airflow inlet can be split along the stator-rotor air gap toward the two ends of the stator core 21, which also reduces the flow path length of the cooling airflow to a certain extent. Thus, while achieving efficient cooling of each heat-generating component, the overall energy consumption of the machine can be reduced.

[0029] In some feasible embodiments, the aforementioned first airflow inlet, second airflow inlet, and third airflow inlet can each be equipped with an inlet with a large flow area, which can ensure that the flow resistance of the introduced fluid is at a low level. However, the heat dissipation uniformity of this single inlet structure is poor. Therefore, as a better embodiment, in some embodiments, the first airflow inlet includes a plurality of first inlets 12 arranged around the rotation axis of the rotating shaft 31, the second airflow inlet includes a plurality of second inlets 13 arranged around the rotation axis of the rotating shaft 31, and the third airflow inlet includes a plurality of third inlets 14 arranged around the rotation axis of the rotating shaft 31. At least one of the first inlet 12, the second inlet 13, and the third inlet 14 extends radially along the outer shell 1, that is, it penetrates the inner and outer sides of the outer shell 1. In a specific embodiment, the first inlet 12, the second inlet 13, and the third inlet 14 all extend radially along the outer shell 1.

[0030] In this technical solution, each airflow inlet is equipped with multiple inlets around the rotation axis of the rotating shaft 31, which enables multi-point introduction of cooling airflow in the circumferential direction of the outer casing 1, ensuring the uniformity of cooling. At the same time, the multiple inlets can further reduce the flow resistance of the cooling airflow and further reduce the energy consumption of the whole machine.

[0031] In some embodiments, the flow area of ​​each first inlet 12 in the first airflow inlet increases along the direction away from the cooling airflow outlet 11; and / or, the flow area of ​​each second inlet 13 in the second airflow inlet increases along the direction away from the cooling airflow outlet 11; and / or, the flow area of ​​each third inlet 14 in the third airflow inlet increases along the direction away from the cooling airflow outlet 11. Specifically, Figure 1 The orientation shown is for reference. The cooling air outlet 11 is located in the top area of ​​the outer casing 1. The first inlet 12, the second inlet 13 and the third inlet 14 are arranged at intervals from top to bottom along the wall of the outer casing 1, and the flow area of ​​each inlet is larger as it goes down. This makes the flow resistance of the airflow introduced at the position with a larger distance from the cooling air outlet 11 smaller, ensuring sufficient cooling and heat dissipation for the heat-generating components that are far away from the cooling air outlet 11.

[0032] In some other preferred embodiments, the spacing between the first inlets 12 in the first airflow inlet portion and the outer casing 1 in the circumferential direction increases in the direction away from the cooling airflow outlet 11; and / or, the spacing between the second inlets 13 in the second airflow inlet portion and the outer casing 1 in the circumferential direction increases in the direction away from the cooling airflow outlet 11; and / or, the spacing between the third inlets 14 in the third airflow inlet portion and the outer casing 1 in the circumferential direction increases in the direction away from the cooling airflow outlet 11.

[0033] In this technical solution, the spacing between adjacent inlets decreases along the direction away from the cooling airflow outlet 11, that is, the density of inlets increases. Correspondingly, under the premise that the flow area of ​​each inlet is equal, the more inlets there are and the larger the flow area, the better for sufficient cooling and heat dissipation of the heat-generating components that are far from the cooling airflow outlet 11.

[0034] In some embodiments, among the third inlet 14 and the first inlet 12, which are equidistant from the cooling airflow outlet 11, the flow area of ​​the third inlet 14 is greater than that of the first inlet 12; that is, in Figure 1 In the orientation shown, from top to bottom, among the first inlet 12 and the third inlet 14 at the same horizontal height, the third inlet 14 has a larger flow area.

[0035] In this technical solution, since the cooling airflow introduced by the third inlet 14 needs to flow through the stator-rotor air gap with a small gap, the flow area of ​​each third inlet 14 is larger than that of the first inlet 12 with the same height, so as to minimize the airflow resistance of the parallel cooling branch and thus improve the cooling effect on the stator core 21 and the motor rotor assembly.

[0036] In some embodiments, the third inlet 14 is located at the midpoint of the length of the stator core 21, that is, at half the stack height of the stator core 21. This ensures that the cooling airflow introduced by the third inlet 14 flows along the axial direction of the rotating shaft 31 to both ends in the stator-rotor air gap with a consistent path length, preventing the airflow from flowing turbulently in the stator-rotor air gap.

[0037] Furthermore, in some embodiments, a supporting arc segment 111 is formed within the cooling airflow outlet 11 to abut against the outer circumferential wall of the stator core 21. The supporting arc segment 111 divides the cooling airflow outlet 11 into a first outlet corresponding to the position of the first airflow inlet (e.g., Figure 1 The left airflow outlet (shown in the diagram) and the second outlet (e.g., the one corresponding to the location of the second airflow inlet) are shown in the diagram. Figure 1 The right-hand airflow outlet is shown in the center.

[0038] In this technical solution, by setting a support arc segment 111 inside the cooling airflow outlet 11, the inner wall surface of the support arc segment 111 is concentric with the inner wall surface of the outer shell 1 and has the same radius, thus forming a reliable limit on the stator core 21, preventing damage to the stator core 21 and the outer shell 1 that may be caused by uneven circumferential force on the stator core 21 and excessive local stress.

[0039] In some embodiments, a plane perpendicular to the rotation axis of the rotating shaft 31 and passing through the midpoint of the axial length of the stator core 21 is a first plane (not shown in the figure). Each first inlet 12 in the first airflow inlet and each second inlet 13 in the second airflow inlet are symmetrical about the first plane. In this case, it is further preferred that the cooling airflow outlet 11 and the support arc segment 111 are both symmetrical about the first plane.

[0040] In this technical solution, the first inlet 12, the second inlet 13, and the cooling air outlet 11 are all symmetrical about the first plane, so that the flow path of the cooling air introduced by each inlet is symmetrical about the first plane. This can reduce the turbulence caused by the asymmetry and uncertainty of the airflow direction, further reduce the airflow resistance, and reduce energy consumption.

[0041] In some embodiments, an annular connecting groove 15 is formed on the inner wall of the outer casing 1. Multiple stator cooling channels 211 are provided, and each stator cooling channel 211 and each third inlet 14 are connected to the annular connecting groove 15. The annular connecting groove 15 has a portion located on the inner wall of the supporting arc segment 111. Thus, the location of the third inlet 14 does not need to correspond one-to-one with the location of each stator cooling channel 211, and the number does not need to be consistent. The annular connecting groove 15 enables uniform distribution of the cooling airflow introduced by each third inlet 14 in the circumferential direction of the stator core 21, thereby ensuring uniform cooling of the stator core 21 in the circumferential direction. Figure 2 In the specific embodiment shown, the first inlet 12 and the second inlet 13 are both round holes, the cross-section of the annular connecting groove 15 is rectangular, and the corresponding third inlet 14 is a rectangular hole so as to match the shape of the annular connecting groove 15, thereby allowing the flow area of ​​the third inlet 14 to be designed to be relatively larger.

[0042] In some embodiments, the stator core 21 includes a first core segment, a second core segment, and an intermediate core segment disposed along the axial direction of the rotating shaft 31. The intermediate core segment is made of a non-magnetic material (e.g., aluminum), while the first and second core segments are made of a magnetic material such as silicon steel sheets. In some embodiments, the intermediate core segment can be welded or bonded to the first and second core segments, and each of the stator cooling channels 211 is formed on the intermediate core segment.

[0043] In this technical solution, a non-magnetic intermediate core section is set between the magnetic first core section and the second core section, and each stator cooling channel 211 is formed on the intermediate core section, which can prevent eddy current losses caused by constructing stator cooling channels 211 on the magnetic material.

[0044] In some embodiments, an outlet sleeve 8 is assembled on the outer edge of the cooling air outlet 11. Specifically, the outlet sleeve 8 is detachably connected to the outer edge of the outlet by bolts.

[0045] The cooling airflow outlet 11 has a flange (not shown in the figure) that protrudes radially outward along the outer casing 1. The protrusion height of the flange is h, and the outer diameter of the outer casing 1 is D, where 1.13 ≤ (D+h) / D ≤ 1.4. This ensures that the flow resistance of the airflow exiting the cooling airflow outlet 11 is at a low level. At this time, the aforementioned lead-out sleeve 8 is assembled to the top end face of the flange.

[0046] According to an embodiment of the present invention, a blower is also provided, including the motor described above. The housing 1 has a first end plate 41 and a second end plate 42 at its two ends. In a specific embodiment, the housing 1 is a cylindrical body open at both ends. The first end plate 41 and the second end plate 42 respectively seal the two openings of the housing 1. A first diffuser plate 51 and a first volute 52 assembled on the first diffuser plate 51 are provided on the side of the first end plate 41 away from the housing 1. A first turbine 53 is provided on the end of the rotating shaft 31 located inside the first volute 52. An axial air suspension bearing 61 is provided on the rotating shaft 31, located between the first diffuser plate 51 and the first end plate 41. An end plate cooling inlet 411 and an end plate cooling outlet 412 are formed on the first end plate 41, wherein the end plate cooling outlet 412 is located on the side of the end plate cooling inlet 411 near the cooling airflow outlet 11. See details. Figure 1 As shown, the end plate cooling inlet 411 is disposed adjacent to the first inlet 12 located in the bottom region of the housing 1, while the end plate cooling outlet 412 is disposed near the aforementioned cooling airflow outlet 11. Thus, the cooling airflow entering through the first inlet 12 can enter the axial air suspension bearing 61 via the end plate cooling inlet 411 and exit the axial air suspension bearing 61 via the end plate cooling outlet 412, and further exit via the cooling airflow outlet 11, thereby achieving efficient cooling of the axial air suspension bearing 61. It is understood that the aforementioned axial air suspension bearing includes a front bearing (not labeled in the figure), a rear bearing (not labeled in the figure), and a thrust plate (not labeled in the figure) fixed integrally with the rotating shaft 31 between the two. The cooling airflow can enter the gap between the thrust plate and the front and rear bearings to achieve efficient cooling of the axial air suspension bearing.

[0047] It should be noted that bearing chambers (not indicated in the figure) are formed on the side end faces of the first end plate 41 and the second end plate 42 near the motor stator assembly. Radial air suspension bearings 62 are respectively assembled in the bearing chambers to achieve rotational support for both ends of the rotating shaft 31. An opening is formed on the side of the bearing chamber near the stator winding 22. The cooling airflow entering through the first inlet 12 and the second inlet 13 can partially enter the bearing chamber to efficiently cool the radial air suspension bearings 62.

[0048] In some embodiments, the cooling airflow outlet 11 is connected to the air intake of the air compression chamber formed by the first volute 52. In a specific embodiment, the air compression chamber is formed by the first diffuser 51 and the first volute 52, and the first turbine 53 compresses the air entering the air compression chamber. In a specific example, the air intake is constructed on the first volute 52, that is, the first volute 52 has a first air intake 521. In other words, the cooling airflow outlet 11 is connected to the first air intake 521 through a corresponding connecting pipe. Specifically, a small-diameter air inlet (not shown in the figure) can be provided at the first air intake 521. One end of the aforementioned connecting pipe is connected to the aforementioned lead-out sleeve 8, and the other end is connected to the aforementioned air inlet. Thus, when the first turbine 53 is driven to rotate at high speed by the rotating shaft 31, a low pressure is formed at the first air intake 521. This low pressure drives the external cooling airflow (i.e., air) to enter the outer casing 1 through each inlet to cool and reduce the temperature of each heat-generating component. Then, the air enters the air compression chamber through the cooling airflow outlet 11, the connecting pipe, and the air inlet. Compared with the technical method of setting a corresponding suction component (such as a negative pressure fan) for the cooling airflow outlet 11, this technical solution can achieve self-suction by using the rotation of the motor itself, without the need for an external cooling fan, saving manufacturing costs and motor layout space.

[0049] See further Figure 1 As shown, in a specific embodiment, the blower is a two-stage air compressor. In this case, a second volute 71 is provided on the outside of the second end plate 42, and a two-stage air compression chamber is formed between the second volute 71 and the second end plate 42 (it can be understood that the air compression chamber formed between the first diffuser plate 51 and the first volute 52 is a first-stage air compression chamber). A second turbine 72 is provided on the shaft end of the rotating shaft 31 in the two-stage air compression chamber. A second intake port 711 and a two-stage exhaust port are formed on the second volute 71, and a first-stage exhaust port is formed on the first volute 52. The first-stage exhaust port is connected to the second intake port 711 through a first-stage exhaust pipe.

[0050] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An electric motor, comprising a housing (1) and a stator assembly and a rotor assembly assembled within the housing (1), the stator assembly comprising a stator core (21) and a stator winding (22) wound on the stator core (21), the rotor assembly comprising a shaft (31) and a rotor core (32) sleeved on the shaft (31), wherein a stator-rotor air gap is formed between the stator core (21) and the rotor core (32), characterized in that, The outer casing (1) has a cooling airflow outlet (11) that extends radially through its inner and outer sides. The outer casing (1) also has a first airflow inlet, a second airflow inlet, and a third airflow inlet that extend radially through its inner and outer sides. The first and second airflow inlets are respectively positioned corresponding to the two ends of the stator winding (22) that protrude from the stator core (21). The stator core (21) has a stator cooling channel (211) that extends radially through it. The third airflow inlet is located between the first and second airflow inlets. In the region between the rotating shaft (31), the cooling air outlet (11) is located between the first air inlet and the second air inlet in the axial direction of the rotating shaft (31). When the cooling air outlet (11) is drawn in, the airflow outside the housing (1) can enter the end region of the stator winding (22) through the first air inlet and the second air inlet. The airflow outside the housing (1) can also enter the stator-rotor air gap through the third air inlet and the stator cooling channel (211) in sequence, and finally flow out through the cooling air outlet (11).

2. The motor according to claim 1, characterized in that, The first airflow inlet includes a first inlet (12), the second airflow inlet includes a second inlet (13), and the third airflow inlet includes a third inlet (14). At least one of the first inlet (12), the second inlet (13), and the third inlet (14) extends radially along the outer shell (1).

3. The motor according to claim 2, characterized in that, The flow area of ​​each first inlet (12) in the first airflow inlet increases in the direction away from the cooling airflow outlet (11); and / or, the flow area of ​​each second inlet (13) in the second airflow inlet increases in the direction away from the cooling airflow outlet (11); and / or, the flow area of ​​each third inlet (14) in the third airflow inlet increases in the direction away from the cooling airflow outlet (11).

4. The motor according to claim 2, characterized in that, The spacing between the first inlets (12) in the first airflow inlet portion and the first inlet portion in the circumferential direction of the outer casing (1) increases in the direction away from the cooling airflow outlet (11); and / or, the spacing between the second inlets (13) in the second airflow inlet portion and the second inlet portion in the circumferential direction of the outer casing (1) increases in the direction away from the cooling airflow outlet (11); and / or, the spacing between the third inlets (14) in the third airflow inlet portion and the third inlet portion in the circumferential direction of the outer casing (1) increases in the direction away from the cooling airflow outlet (11).

5. The motor according to claim 2, characterized in that, Of the third inlet (14) and the first inlet (12), which are equidistant from the cooling airflow outlet (11), the flow area of ​​the third inlet (14) is greater than that of the first inlet (12).

6. The motor according to claim 2, characterized in that, The third inlet (14) is located at the midpoint of the length of the stator core (21); and / or, the plane perpendicular to the rotation axis of the rotating shaft (31) and passing through the midpoint of the axial length of the stator core (21) is the first plane, and each first inlet (12) in the first airflow inlet and each second inlet (13) in the second airflow inlet are symmetrical about the first plane.

7. The motor according to claim 6, characterized in that, The cooling air outlet (11) has a supporting arc segment (111) that abuts against the outer circumferential wall of the stator core (21). The supporting arc segment (111) divides the cooling air outlet (11) into a first outlet corresponding to the position of the first air inlet and a second outlet corresponding to the position of the second air inlet.

8. The motor according to claim 7, characterized in that, The cooling air outlet (11) and the supporting arc segment (111) are both symmetrical about the first plane.

9. The motor according to claim 7, characterized in that, An annular connecting groove (15) is formed on the inner wall of the outer shell (1). There are multiple stator cooling channels (211), and each stator cooling channel (211) and each third inlet (14) are connected to the annular connecting groove (15). The annular connecting groove (15) has a portion located on the inner wall surface of the supporting arc segment (111).

10. The motor according to claim 9, characterized in that, The stator core (21) includes a first core segment, a second core segment and an intermediate core segment located between the first core segment and the second core segment, arranged axially along the rotating shaft (31). The intermediate core segment is made of a non-magnetic material, and each stator cooling channel (211) is formed on the intermediate core segment.

11. The motor according to claim 2, characterized in that, The first inlet (12) has a plurality of ports, each of which is evenly spaced around the axis of rotation of the rotating shaft (31); and / or, the second inlet (13) has a plurality of ports, each of which is evenly spaced around the axis of rotation of the rotating shaft (31); and / or, the third inlet (14) has a plurality of ports, each of which is evenly spaced around the axis of rotation of the rotating shaft (31).

12. The motor according to claim 1, characterized in that, The cooling air outlet (11) has a flange that protrudes radially outward along the outer shell (1), the protrusion height of the flange is h, and the outer diameter of the outer shell (1) is D, 1.13≤(D+h) / D≤1.

4.

13. A blower, characterized in that, The motor comprising any one of claims 1 to 12, wherein the housing (1) is provided with a first end plate (41) and a second end plate (42) at both ends, the first end plate (41) being provided with a first diffuser plate (51) and a first volute (52) assembled on the first diffuser plate (51) on the side away from the housing (1), the shaft (31) being provided with a first turbine (53) at the end inside the first volute (52), the shaft (31) being provided with an axial air suspension bearing (61), the axial air suspension bearing (61) being located between the first diffuser plate (51) and the first end plate (41), the first end plate (41) being provided with an end plate cooling inlet (411) and an end plate cooling outlet (412), wherein the end plate cooling outlet (412) is located on the side of the end plate cooling inlet (411) near the cooling airflow outlet (11).

14. The blower according to claim 13, characterized in that, The cooling air outlet (11) is connected to the air intake of the air compression chamber formed by the first volute (52).

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