Air-cooled permanent magnet motor

Abstract

The utility model provides an air-cooled permanent magnet motor. The air-cooled permanent magnet motor comprises a shell, two end covers, a stator and a flow guide part, wherein the shell is arranged along a first direction; the two end covers are arranged at an interval in the first direction and are fixed with the shell; the stator is arranged in the shell, and the stator and the two end covers are arranged at intervals; the rotor is arranged in the stator, and an output shaft of the rotor penetrates through the end cover in the first direction; the diversion member extends along a first direction, and two ends of the diversion member in the first direction are respectively connected with the end cover and the stator; wherein the flow guide piece is telescopic in the first direction so as to be connected with the end cover and the stator in a sealing manner. According to the utility model, the diversion member capable of telescoping in the first direction is arranged between the end cover and the stator, so that the diversion member can adapt to the distance between the end cover and the stator, and the diversion member can be connected with the end cover and the stator in a sealing manner; the manufacturing and assembling difficulty is reduced, and the sealing effect on the stator and the end cover is improved, so that the stator and / or the rotor can be better protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and more specifically, relates to an air-cooled permanent magnet motor. Background Art

[0002] In order to protect the end of the stator, the relevant motor first fills the end of the stator with sealant, and then presses the connection seat onto the sealant to seal the end of the stator. Since the sealant is formed by filling, it is easy to cause thickness error and surface unevenness. In turn, there is an overall size error between the connection seat and the stator, which increases the difficulty of subsequent assembly; or, the connection seat and the stator are not tightly sealed. Utility Model Content

[0003] In view of this, the utility model provides an air-cooled permanent magnet motor to solve the technical problems of difficulty in assembling the motor and loose sealing of the stator end.

[0004] The technical solution of the utility model is achieved in this way:

[0005] An embodiment of the utility model provides an air-cooled permanent magnet motor, comprising: a shell, arranged along a first direction; two end covers, arranged at intervals in the first direction and fixed to the shell; a stator, arranged in the shell and arranged at intervals from the two end covers; a rotor, arranged inside the stator, and an output shaft of the rotor passes through the end covers along the first direction; a flow guide, extending along the first direction, and the two ends of the flow guide in the first direction are respectively connected to the end covers and the stator; wherein the flow guide is retractable in the first direction to seal and connect the end covers and the stator.

[0006] In some embodiments, the guide member is step-shaped, and has a small diameter portion and a large diameter portion sequentially arranged in the first direction.

[0007] In some embodiments, one end of the small diameter portion is connected to the end cover, one end of the large diameter portion is connected to the stator, the small diameter portion and the large diameter portion are connected via a connecting portion, and an extending direction of the connecting portion is perpendicular to the first direction.

[0008] In some embodiments, a first airflow channel along the first direction is formed between the outside of the stator and the housing; and the air guide is connected to the outer edge of the stator to guide the airflow into the first airflow channel.

[0009] In some embodiments, the shell includes: a first shell, which is sleeved on the outside of the guide member; an air inlet extending radially is formed inside the first shell, and the air inlet is connected to the first air flow channel; and a second shell, the second shell and the first shell are abutted in the first direction and are sleeved on the outside of the stator.

[0010] In some embodiments, the guide member is provided with a first lead opening, and the first shell is provided with a second lead opening; the air-cooled permanent magnet motor also includes: a copper busbar, which passes through the first lead opening, the air inlet and the second lead opening in sequence; and one end of the copper busbar is electrically connected to the stator, and the other end is electrically connected to the junction box assembly on the outside of the second shell.

[0011] In some embodiments, a first seal is provided in the first lead-out, and the first seal is used to seal the gap between the copper busbar and the first lead-out; and / or a second seal is provided in the second lead-out, and the second seal is used to seal the gap between the copper busbar and the second lead-out.

[0012] In some embodiments, a first step surface is formed on the outer edge of the stator, and one end of the guide member along the first direction abuts against the first step surface; a second step surface is formed on the inner side of the end cover, and the other end of the guide member along the first direction abuts against the second step surface.

[0013] In some embodiments, a stator pressure ring is provided at the end of the stator in the first direction, and the stator pressure ring forms the outer edge of the stator; and a gasket is sandwiched between the end cover and the guide member.

[0014] In some embodiments, flanges are provided at both ends of the flow guide, wherein one of the flanges is connected to the stator using a first threaded fastener, and the other flange is connected to the end cover using a second threaded fastener.

[0015] The air-cooled permanent magnet motor of the utility model embodiment comprises a housing, two end caps, a stator and a flow guide, wherein the housing is arranged along a first direction; the two end caps are arranged at intervals in the first direction and fixed to the housing; the stator is arranged in the housing and arranged at intervals with the two end caps; the rotor is arranged inside the stator, and the output shaft of the rotor passes through the end caps along the first direction; the flow guide extends along the first direction, and the two ends of the flow guide in the first direction are respectively connected to the end caps and the stator; wherein the flow guide is retractable in the first direction to seal the connection between the end caps and the stator. The utility model embodiment arranges the flow guide between the end caps and the stator, and arranges the flow guide to be retractable in the first direction, so that the flow guide can adapt to the spacing between the end caps and the stator, and then the flow guide can seal the connection between the end caps and the stator. In this way, even if there are manufacturing errors between the stator and the end caps, the overall size of the stator, the flow guide and the end caps can still be kept unchanged, which is conducive to subsequent assembly. Since the flow guide blocks the airflow on the outside of the flow guide, the rotor is protected from the influence of debris in the airflow, or the rotor and the stator are protected from the influence of debris in the airflow at the same time. Therefore, the embodiment of the utility model not only reduces the difficulty of manufacturing and assembling by providing a retractable flow guide, but also improves the sealing effect of the stator and the end cover, thereby better protecting the stator and / or rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a cross-sectional view of a related motor;

[0017] Figure 2 A cross-sectional view of an air-cooled permanent magnet motor according to an embodiment of the utility model;

[0018] Figure 3 This is a schematic structural diagram of a flow guide member according to an embodiment of the utility model;

[0019] Figure 4 for Figure 2 Enlarged view of point A in the middle.

[0020] Description of reference numerals:

[0021] 1. stator; 10. first air flow channel; 101. air inlet; 102. air outlet; 11. stator pressure ring; 2. end cover; 21. gasket; 3. shell; 31. first shell; 311. second lead-in port; 3111. second sealing member; 32. second shell; 4. rotor; 41. output shaft; 5. flow guide; 51. small diameter portion; 52. large diameter portion; 53. connecting portion; 54. first lead-in port; 541. first sealing member; 55. rib plate; 6. junction box assembly; 7. connecting seat; 8. copper busbar; 9. flange. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0023] The various specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in the utility model will not be described separately.

[0024] In the following description, the terms "first\second\..." are only used to distinguish different objects, and do not mean that the objects have the same or related points. It should be understood that the directions "above", "below", "outside" and "inside" are all directions in normal use, and the directions "left" and "right" refer to the left and right directions shown in the corresponding schematic diagrams, which may or may not be the left and right directions in normal use.

[0025] It should be noted that the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0026] Related motors, such as Figure 1 As shown, a connection seat 7 is connected between the stator 1 and the end cover 2, and the connection seat 7 blocks the airflow outside the connection seat 7 to protect the rotor (that is, to prevent the rotor from being damaged by the impact of debris in the airflow). The specific installation process is: firstly, the connection seat 7 and the end cover 2 are connected as a whole by bolts, and then the whole is connected to the housing 3 and the seal on the end face of the stator 1. This assembly measure has the following disadvantages: first, the stator 1 is not protected; second, it is difficult to achieve assembly accuracy with multiple stopper installation.

[0027] In order to solve the above-mentioned technical problems of related motors, the embodiment of the utility model provides an air-cooled permanent magnet motor. The air-cooled permanent magnet motor provided by the embodiment of the utility model is described in detail below.

[0028] like Figure 2As shown, the external structure of the air-cooled permanent magnet motor includes a housing 3 and two end covers 2. The housing 3 is arranged along a first direction. The two end covers 2 are arranged at intervals in the first direction and fixed to the housing 3. The housing 3 and the two end covers 2 form a whole, thereby protecting the internal structure of the air-cooled permanent magnet motor. The first direction is indicated by a dotted line a in the figure.

[0029] like Figure 2 As shown, the internal structure of the air-cooled permanent magnet motor includes a stator 1 and a rotor 4. The stator 1 is a cylindrical structure with a hollow interior and openings at both ends along the first direction. The hollow cavity inside the stator 1 is used to accommodate the rotor 4, that is, the rotor 4 is arranged inside the stator 1, and the output shafts 41 at both ends of the rotor 4 along the first direction extend out of the openings at both ends of the stator 1, and the output shaft 41 passes through the end cover 2 (that is, the output shaft 41 extends out of the outside of the end cover 2, and the outside of the end cover 2 can be understood as the side of the end cover 2 away from the stator 1), so that the output shaft 41 is connected to other mechanical devices, so as to transmit the power of the output shaft 41 to other mechanical devices. The stator 1 can generate a rotating magnetic field after passing alternating current, and the rotor 4 is provided with a permanent magnet. Since like poles repel each other and opposite poles attract each other, the rotor 4 rotates with the rotation of the magnetic field generated by the stator 1. The number of phases of the alternating current connected to the stator 1 is not specifically limited in the embodiment of the utility model, for example, single-phase, two-phase, and three-phase alternating current.

[0030] like Figure 2 As shown, the internal structure of the air-cooled permanent magnet motor also includes a guide member 5, which extends along the first direction to form an internal hollow columnar structure. The internal hollow setting of the guide member 5, on the one hand, facilitates the output shaft 41 of the rotor 4 to pass through the guide member 5 and extend out of the end cover 2, and on the other hand, it can improve the elasticity of the guide member 5 itself, reduce weight and reduce costs. The cross-section of the internal hollow guide member 5 perpendicular to the first direction can be a circular ring or a ring of other shapes. The two ends of the guide member 5 in the first direction are respectively connected to the end cover 2 and the stator 1; the connection between the guide member 5 and the end cover 2, and the connection between the guide member 5 and the stator 1, can be a detachable connection (such as screws or bolts) or a fixed connection (such as welding).

[0031] like Figure 2As shown, the guide 5 can be extended in the first direction to seal the end cover 2 and the stator 1; that is, the guide 5 and the end cover 2 can be sealed, and the guide 5 and the stator can be sealed. The extension can be understood as a slight extension in the first direction, that is, the length of the guide 5 that can be extended is significantly less than the length of the guide 5 along the first direction. In this way, even if there are manufacturing errors and / or assembly errors between the stator 1 and the end cover 2, the guide 5 can still adapt to the spacing distance between the end cover 2 and the stator 1. Example 1, the sealant on the end face of the stator 1 is too thick, the guide 5 can be shortened and connected between the end cover 2 and the stator 1, then the end cover 2, the guide 5 and the stator 1 are connected as a whole, and the overall size remains unchanged. Example 2, the sealant on the end face of the stator 1 is too thin, the guide 5 can be extended and connected between the end cover 2 and the stator 1, then the end cover 2, the guide 5 and the stator 1 are connected as a whole, and the overall size remains unchanged. The dimensions of the end cover 2, the guide 5 and the stator 1 remain unchanged after being connected as a whole, which is not only conducive to subsequent assembly, but also because the guide 5 and the end cover 2 are sealed and connected, and the guide 5 and the stator 1 are sealed, the airflow outside the guide 5 is difficult to enter the inside of the guide 5, thereby protecting the rotor 4 from the influence of debris in the airflow, or protecting the stator 1 and the rotor 4 from the influence of debris in the airflow. The outside of the guide 5 is the side away from the internal hollow structure of the guide 5; the inside of the guide 5 is the side located inside the internal hollow structure of the guide 5.

[0032] The air-cooled permanent magnet motor of the utility model embodiment comprises a housing, two end caps, a stator and a flow guide, wherein the housing is arranged along a first direction; the two end caps are arranged at intervals in the first direction and fixed to the housing; the stator is arranged in the housing and arranged at intervals with the two end caps; the rotor is arranged inside the stator, and the output shaft of the rotor passes through the end caps along the first direction; the flow guide extends along the first direction, and the two ends of the flow guide in the first direction are respectively connected to the end caps and the stator; wherein the flow guide is retractable in the first direction to seal the connection between the end caps and the stator. The utility model embodiment arranges the flow guide between the end caps and the stator, and arranges the flow guide to be retractable in the first direction, so that the flow guide can adapt to the spacing between the end caps and the stator, and then the flow guide can seal the connection between the end caps and the stator. In this way, even if there are manufacturing errors between the stator and the end caps, the overall size of the stator, the flow guide and the end caps can still be kept unchanged, which is conducive to subsequent assembly. Since the flow guide blocks the airflow on the outside of the flow guide, the rotor is protected from the influence of debris in the airflow, or the rotor and the stator are protected from the influence of debris in the airflow at the same time. Therefore, the embodiment of the utility model not only reduces the difficulty of manufacturing and assembling by providing a retractable flow guide, but also improves the sealing effect of the stator and the end cover, thereby better protecting the stator and / or rotor.

[0033] In some embodiments, Figure 2 and Figure 3As shown, the guide member 5 can be made of metal material for ease of manufacture; it can also be made of non-metallic material, which has the advantages of light weight, corrosion resistance, good insulation, etc.

[0034] The guide member 5 may be linear or non-linear in the first direction. It is understood that, under the same thickness and material, a non-linear plate is more conducive to bending than a linear plate, that is, a non-linear plate can be more flexible in the first direction. Therefore, in order to make the guide member 5 more flexible, the guide member 5 as a whole may be stepped, serrated, or in the shape of a letter "V".

[0035] In some embodiments, Figure 2 and Figure 3 As shown, the guide member 5 is stepped and has a small diameter portion 51 and a large diameter portion 52 arranged in sequence in the first direction. The small diameter portion 51 and the large diameter portion 52 may be provided with only one or more of each; one small diameter portion 51 and two large diameter portions 52 may be provided; one large diameter portion 52 and two small diameter portions 51 may be provided. Exemplarily, the large diameter portion 52 and the small diameter portion 51 may be provided with multiple of each, and the small diameter portion 51 and the large diameter portion 52 may be arranged alternately in sequence along the first direction.

[0036] The embodiment of the utility model arranges the guide into a small diameter part and a large diameter part, thereby forming a step shape, which is simple to manufacture; and the step-shaped guide member can be easily extended and retracted in the first direction to be sealed and connected between the end cover and the stator.

[0037] In some embodiments, Figure 2 and Figure 3 As shown, one end of the small diameter portion 51 is connected to the end cover 2, one end of the large diameter portion 52 is connected to the stator 1, and the small diameter portion 51 and the large diameter portion 52 are connected by a connecting portion 53, and the extending direction of the connecting portion 53 is perpendicular to the first direction. In this way, the small diameter portion 51, the connecting portion 53 and the large diameter portion 52 are sequentially connected to form a "Z"-shaped structure, and the "Z"-shaped flow guide 5 can be formed by injection molding, plate bending or plate welding, etc., which is easy to realize.

[0038] In some embodiments, Figure 3 As shown, at least one of the small diameter portion 51, the connecting portion 53 and the large diameter portion 52 is provided with a thinning section. Example 1: The thickness of the connecting portion 53 is less than the thickness of the large diameter portion 52, and the thickness of the connecting portion 53 is less than the thickness of the small diameter portion 51; Example 2: The thickness of the end of the large diameter portion 52 connected to the connecting portion 53 is less than the thickness of the end of the large diameter portion 52 away from the connecting portion 53; Example 3: The thickness of the end of the small diameter portion 51 connected to the connecting portion 53 is less than the thickness of the end of the small diameter portion 51 away from the connecting portion 53. The embodiment of the utility model increases the flexibility of the guide member and improves the size error compensation function of the guide member through the provision of the thinning section.

[0039] In some embodiments, Figure 2 As shown, a first airflow channel 10 is formed along a first direction between the outside of the stator 1 and the housing 3; the outside of the stator 1 can be understood as the outer circular wall or the outer peripheral wall of the stator 1. Exemplarily, in order to achieve the circulation of the first airflow channel 10, an air inlet 101 can be opened at one end of the housing 3 close to one end cover 2, and an air outlet 102 can be opened at the other end cover. In this way, the gas introduced by the air inlet 101 flows through the first airflow channel 10 and then flows out from the air outlet 102; as the gas flows out, the heat of the stator 1 is taken away, reducing the risk of short circuit of the stator 1 due to high temperature.

[0040] like Figure 2 As shown, the guide member 5 is connected to the outer edge of the stator 1 to guide the airflow into the first airflow channel 10; the outer edge of the stator 1 can be understood as the maximum outer diameter of the stator 1. In this way, the air at the air inlet 101 can quickly enter the first airflow channel 10.

[0041] The embodiment of the utility model connects the guide to the outer edge of the stator so that the ends of the stator and the rotor are shielded by the guide, thereby preventing debris in the airflow from passing through the end faces of the stator and the rotor and entering the interior of the stator and the rotor, thereby protecting the stator and the rotor at the same time.

[0042] In some embodiments, Figure 2 As shown, the housing 3 includes a first housing 31 and a second housing 32. The first housing 31 is sleeved on the outside of the air guide 5, so that the airflow can only flow on the outside of the air guide 5 and is difficult to enter the inside of the air guide 5. The second housing 32 abuts against the first housing 31 in the first direction, and the second housing 32 is sleeved on the outside of the stator; an air inlet 101 extending along the radial direction is formed inside the first housing 31; the air inlet 101 is connected to the first airflow channel 10. The radial direction is indicated by a dotted line b in the figure, and the meridian direction is perpendicular to the first direction.

[0043] like Figure 2 As shown, the air inlet 101 and the air outlet 102 are at the two ends of the first airflow channel 10, and the first airflow channel 10 completely flows through the outside of the stator 1 in the first direction, so as to take away more heat from the stator 1. At the same time, the first shell 31 is provided with an air inlet 101, and the air inlet 101 has a certain depth along the radial direction, so as to facilitate the connection between the air inlet 101 and the pipe for introducing gas; in exemplary embodiment 1, the pipe extends into the air inlet 101 and is threadedly connected to the first shell 31; in exemplary embodiment 2, the pipe can be connected to the end face of the first shell 31 radially away from the guide member 5 through a threaded fastener. By providing a guide member in the first shell, the embodiment of the utility model can conveniently introduce external air into the first airflow channel, which is convenient for operation.

[0044] In some embodiments, the air-cooled permanent magnet motor also includes a copper bar 8. The copper bar 8 is used to connect the stator 1 to an external power source so that the stator 1 can generate a rotating magnetic field. The guide member 5 is provided with a first lead-in opening 54, and the first shell 31 is provided with a second lead-in opening 311; the copper bar 8 passes through the first lead-in opening 54, the air inlet 101, and the second lead-in opening 311 in sequence; and one end of the copper bar 8 is electrically connected to the stator 1, and the other end of the copper bar 8 is electrically connected to the junction box assembly 6 on the outside of the second shell. It can be understood that there is current flowing through the copper bar 8, which easily generates heat. In the embodiment of the utility model, the heat of the copper bar can be taken away by the cooling medium in the air inlet by passing the copper bar through the air inlet.

[0045] In some embodiments, Figure 2 As shown, a first sealing member (not shown) is provided in the first lead-in opening 54, and the first sealing member is used to seal the gap between the copper bar 8 and the first lead-in opening 54. The first sealing member can be a felt pad or an adhesive. The embodiment of the utility model can not only seal the first lead-in opening through the provision of the first sealing member, so that the airflow will not pass through the first lead-in opening and contact the stator and the rotor, so as to protect the stator and the rotor; but also reduce the friction between the copper bar and the guide member at the first lead-in opening, so as to protect both the copper bar and the guide member.

[0046] In some embodiments, Figure 2 and Figure 4 As shown, a second sealing member (not shown) is provided in the second lead-in opening 311, and the second sealing member is used to seal the gap between the copper bar 8 and the second lead-in opening 311. The second sealing member can be a felt pad or an adhesive. The embodiment of the utility model can not only seal the second lead-in opening through the provision of the second sealing member, so that the airflow will not pass through the second lead-in opening and enter the junction box assembly to protect the junction box assembly; but also reduce the friction between the copper bar and the guide member at the second wiring opening, thereby protecting both the copper bar and the guide member.

[0047] In some embodiments, Figure 4 As shown, a first step surface M1 is formed on the outer edge of the stator 1, and one end of the flow guide 5 along the first direction abuts against the first step surface M1. A second step surface M2 is formed on the inner side of the end cover 2, and the other end of the flow guide 5 along the first direction abuts against the second step surface M2. The embodiment of the utility model facilitates assembly by setting the first step surface and the second step surface; for example, when assembling the flow guide, the two ends of the flow guide can be respectively abutted against the first step surface and the second step surface, so that the flow guide can be positioned, thereby facilitating the subsequent fixed connection of the flow guide between the end cover and the stator.

[0048] In some embodiments, Figure 4As shown, the stator 1 is provided with a stator pressing ring 11 at the end in the first direction, and the stator pressing ring 11 forms the outer edge of the stator; a gasket 21 is sandwiched between the end cover 2 and the flow guide 5. The embodiment of the utility model increases the elasticity of the connection between the flow guide and the stator, and the elasticity of the connection between the flow guide and the end cover through the provision of the stator pressing ring and the gasket, so that the flow guide can be better sealed and connected between the end cover and the stator.

[0049] In some embodiments, Figure 3 and Figure 4 As shown, flanges 9 are provided at both ends of the guide member 5, wherein one flange 9 is connected to the stator 1 by a first threaded fastener, and the other flange 9 is connected to the end cover 2 by a second threaded fastener. Specifically, the flange 9 can be welded to the outer side of the end of the guide member 5, which is convenient for operation and observation relative to welding the flange 9 to the inner side of the end of the guide member 5. The first threaded fastener and the second threaded fastener can be screws, bolts, etc. In the embodiment of the utility model, by arranging flanges at the ends of the guide member, the guide member can be connected between the stator and the end cover by threaded fasteners, which is convenient for operation.

[0050] In some embodiments, Figure 3 As shown, in order to increase the strength of the guide member 5, a rib plate 55 may be welded on the inner side of the guide member 5, or the rib plate 55 may be welded on the outer side of the guide member as shown in the figure.

[0051] The air-cooled permanent magnet motor provided by the utility model can be used alone or in combination with other devices. For example, the permanent magnet motor can be applied to drive motors, brake systems, electric fans, etc. in new energy vehicles and smart electric vehicles.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. An air-cooled permanent magnet motor, characterized in that: include: A housing, arranged along a first direction; Two end covers, spaced apart in the first direction and fixed to the housing; A stator is arranged in the housing and spaced apart from the two end covers; A rotor is disposed inside the stator, and an output shaft of the rotor passes through the end cover along the first direction; A flow guide extending along the first direction, wherein two ends of the flow guide in the first direction are respectively connected to the end cover and the stator; Wherein, the flow guide is retractable in the first direction to seal and connect the end cover and the stator.

2. The air-cooled permanent magnet motor according to claim 1, characterized in that: The guide member is in a step shape, and has a small diameter portion and a large diameter portion sequentially arranged in the first direction.

3. The air-cooled permanent magnet motor according to claim 2, characterized in that: One end of the small diameter portion is connected to the end cover, one end of the large diameter portion is connected to the stator, the small diameter portion and the large diameter portion are connected via a connecting portion, and an extending direction of the connecting portion is perpendicular to the first direction.

4. The air-cooled permanent magnet motor according to claim 1, characterized in that: A first airflow channel along the first direction is formed between the outside of the stator and the shell; the airflow guide is connected to the outer edge of the stator to guide the airflow to flow into the first airflow channel.

5. The air-cooled permanent magnet motor according to claim 4, characterized in that: The housing comprises: A first shell is sleeved on the outer side of the guide member; an air inlet extending in a radial direction is formed inside the first shell, and the air inlet is connected to the first air flow channel; The second shell is abutted against the first shell in the first direction and is sleeved on the outer side of the stator.

6. The air-cooled permanent magnet motor according to claim 5, characterized in that: The guide member is provided with a first lead-in opening, and the first housing is provided with a second lead-in opening; the air-cooled permanent magnet motor further comprises: A copper busbar passes through the first lead-in port, the air inlet and the second lead-in port in sequence; one end of the copper busbar is electrically connected to the stator, and the other end of the copper busbar is electrically connected to the junction box assembly outside the second shell.

7. The air-cooled permanent magnet motor according to claim 6, characterized in that: A first seal is provided in the first lead-in opening, and the first seal is used to seal the gap between the copper busbar and the first lead-in opening; and / or a second seal is provided in the second lead-in opening, and the second seal is used to seal the gap between the copper busbar and the second lead-in opening.

8. The air-cooled permanent magnet motor according to claim 4, characterized in that: A first step surface is formed on the outer edge of the stator, and one end of the guide member along the first direction abuts against the first step surface; a second step surface is formed on the inner side of the end cover, and the other end of the guide member along the first direction abuts against the second step surface.

9. The air-cooled permanent magnet motor according to claim 8, characterized in that: A stator pressing ring is provided at the end of the stator in the first direction, and the stator pressing ring forms the outer edge of the stator; a gasket is sandwiched between the end cover and the flow guide.

10. The air-cooled permanent magnet motor according to claim 4, characterized in that: Flanges are arranged at both ends of the flow guide, one of the flanges is connected to the stator by a first threaded fastener, and the other flange is connected to the end cover by a second threaded fastener.

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