Air-cooled permanent magnet motor

Abstract

The utility model provides an air-cooled permanent magnet motor. The motor comprises a shell, two end covers, a stator, a rotor 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 a first airflow channel extending in the first direction is formed between the exterior of the stator and the shell; a second airflow channel penetrating through the stator in the first direction is arranged in the stator; the diversion member extends along the first direction, and two ends of the diversion member in the first direction are respectively connected with the end cover and the stator so as to guide airflow to pass through the first airflow channel and the second airflow channel. According to the utility model, the first airflow channel is arranged between the outside of the stator and the shell, and the second airflow channel is arranged in the stator, so that the motor can dissipate heat from the inside and the outside of the stator at the same time, and the stator belongs to a heating source of the motor, so that the motor can dissipate heat from the inside and the outside of the heating source at the same time; and the heat dissipation speed of the motor is effectively improved.

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 the related motors, multiple heat sinks are added to the motor housing, and / or an air flow channel is provided outside the stator to cool the motor. However, the heat dissipation structure is not set reasonably enough, and on the one hand, it is not possible to quickly remove the high heat generated by the stator of the motor due to the large amount of current flowing through it. Utility Model Content

[0003] In view of this, the utility model provides an air-cooled permanent magnet motor to solve the technical problem that the heat dissipation of the motor is not fast enough.

[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, a first airflow channel extending along the first direction is formed between the outside of the stator and the shell; a second airflow channel penetrating the stator along the first direction is arranged inside the stator; a rotor, sleeved inside the stator along the first direction, the output shaft of the rotor penetrating the shell along the first direction; a guide member, extending along the first direction, the two ends of the guide member in the first direction are respectively connected to the end covers and the stator, so as to guide the airflow through the first airflow channel and the second airflow channel.

[0006] In some embodiments, the stator includes: a stator core, which is arranged in the shell, and the first airflow channel is formed between the stator core and the shell; the stator core is provided with the second airflow channel; a stator coil, which is arranged inside the stator core, and the rotor is arranged inside the stator coil; wherein the flow guide is connected to the stator core.

[0007] In some embodiments, the stator core includes: a magnetic conductive part extending along the first direction, the inner wall of the magnetic conductive part is provided with a groove penetrating along the first direction, and the stator coil is arranged in the groove; two pressure rings are correspondingly arranged at both ends of the magnetic conductive part in the first direction to limit the movement of the magnetic conductive part in the first direction; wherein the second air flow channel passes through the magnetic conductive part and the pressure ring along the first direction, and the air flow conductive part abuts against the pressure ring.

[0008] In some embodiments, the guide member abuts against an end surface of the pressure ring in the first direction, and the guide member is provided with a through hole, and the through hole is communicated with the second air flow channel.

[0009] In some embodiments, a plurality of the first airflow channels and a plurality of the second airflow channels are provided, and the first airflow channels and the second airflow channels are evenly distributed around the circumference.

[0010] In some embodiments, the shell includes: a first shell, which is sleeved on the outside of the guide member, and the first shell is provided with an air inlet; a second shell, which is connected to the first shell, and the second shell is sleeved on the outside of the stator; wherein the first shell and the second shell are respectively connected to the two end covers; the air inlet extends radially along the stator, and the first airflow channel and the second airflow channel are respectively connected to the air inlet.

[0011] 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.

[0012] 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.

[0013] In some embodiments, a flange is provided at the end of the guide member, the flange and the pressure ring are connected by a threaded fastener, and the threaded fastener and the through hole are staggered in the circumferential direction.

[0014] In some embodiments, a first step surface is formed at the end of the pressure ring along the first direction, 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.

[0015] The air-cooled permanent magnet motor provided by the utility model embodiment includes a housing, two end covers, a stator, a rotor and a guide, the housing is arranged along a first direction; the two end covers are arranged at intervals in the first direction and fixed to the housing; the stator is arranged in the housing, and a first airflow channel extending in the first direction is formed between the outside of the stator and the housing; a second airflow channel penetrating the stator along the first direction is arranged inside the stator; the rotor is sleeved inside the stator along the first direction, and the output shaft of the rotor penetrates the housing along the first direction; the guide extends along the first direction, and the two ends of the guide in the first direction are respectively connected to the end cover and the stator to guide the airflow through the first airflow channel and the second airflow channel. The utility model embodiment sets the first airflow channel between the outside of the stator and the housing, and sets the second airflow channel inside the stator, so that the motor can dissipate heat from the inside and outside of the stator at the same time, and the stator belongs to the heat source of the motor, so the motor dissipates heat from the inside and outside of the heat source at the same time, which effectively improves the heat dissipation speed of the motor. And by setting the guide between the stator and the end cover, the airflow is introduced into the first airflow channel and the second airflow channel, avoiding the airflow passing through other parts inside the motor, that is, further improving the circulation speed of the airflow. 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 diagram of the assembly of the stator of an embodiment of the utility model;

[0019] Figure 4 This is a schematic structural diagram of a stator core according to an embodiment of the utility model;

[0020] Figure 5 This is a schematic structural diagram of a flow guide member according to an embodiment of the utility model;

[0021] Figure 6 A cross-sectional view of a first airflow channel and a second airflow channel of an embodiment of the utility model;

[0022] Figure 7 for Figure 2 Enlarged view of point A in the middle.

[0023] Description of reference numerals:

[0024] 1. stator; 11. stator core; 111. magnetic conductive part; 1111. groove; 112. pressure ring; 113. pull plate; 12. stator coil; 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; 50. through hole; 51. flange; 511. first connecting hole; 54. first lead-in port; 55. rib plate; 541. first sealing member; 6. junction box assembly; 7. connecting seat; 8. copper busbar; 100. first air flow channel; 1001. air inlet; 1002. air outlet; 200. second air flow channel. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Related motors, such as Figure 1As shown, a first airflow channel 100 is provided between the outside of the stator 1 and the housing 3, and the first airflow channel 100 completely flows through the outside of the stator 1 along the first direction. It can be understood that a large amount of current flows through the inside of the stator 1 to generate high heat, and the heat diffuses from the inside of the stator 1 to the outside of the stator 1, that is, the temperature inside the stator 1 is higher than the temperature outside the stator 1. The airflow in the first airflow channel 100 takes away the heat from the outside of the stator 1, and does not take away the heat from the source of the heat generated by the stator 1, resulting in the temperature inside the stator 1 still being high. In other words, the setting of the first airflow channel 100 is difficult to achieve rapid heat dissipation.

[0030] In order to solve the above-mentioned technical problems of related motors, an 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.

[0031] like Figure 2 As 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.

[0032] 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.

[0033] A first airflow channel 100 extending in a first direction is formed between the outside of the stator 1 and the housing 3, and a second airflow channel 200 penetrating the stator 1 in the first direction is provided inside the stator 1; thus, airflow channels are provided both outside the stator 1 and inside the stator 1. The first airflow channel 100 takes away heat from the outside of the stator 1, and the second airflow channel 200 takes away heat from the source of heat generation (i.e., inside the stator 1).

[0034] like Figure 2As shown, in order to prevent the debris in the airflow of the permanent magnet motor from damaging the stator 1 and the rotor 4, the internal structure of the air-cooled permanent magnet motor is also provided with a guide 5. The guide 5 extends along the first direction, and the two ends of the guide 5 in the first direction are respectively connected to the end cover 2 and the stator 1, so as to protect the end faces of the stator 1 and the rotor 4. The connection between the guide 5 and the end cover 2, and the connection between the guide 5 and the stator 1, can be abutting connection, a detachable connection (such as screws, bolts), or a fixed connection (such as welding). The guide 5 has the function of guiding the airflow, that is, guiding the gas into the first airflow channel 100 and the second airflow channel 200.

[0035] like Figure 2 As shown, the first airflow channel 100 and the second airflow channel 200 are both connected to the air inlet 1001 and the air outlet 1002. The setting positions of the air inlet 1001 and the air outlet 1002 include at least the following situations: the first situation, the air inlet 1001 and the air outlet 1002 are respectively correspondingly set at the two end covers 2; the second situation, the air inlet 1001 and the air outlet 1002 are respectively correspondingly set at the two ends of the shell 3 along the first direction; the third situation, the air inlet 1001 is set at one end of the shell 3 along the first direction, and the air outlet 1002 is set at the end cover 2 close to the other end of the shell 3 along the first direction; the fourth situation, the air outlet 1002 is set at one end of the shell 3 along the first direction, and the air inlet 1001 is set at the end cover 2 close to the other end of the shell 3 along the first direction. In this way, the gas introduced by the air inlet 1001 flows through the first air flow channel 100 and the second air flow channel 200 at the same time, and then flows out from the air outlet 1002; as the gas flows out, the internal heat and external heat of the stator 1 are taken away, reducing the risk of short circuit of the stator 1 due to high temperature.

[0036] like Figure 2 As shown, the connection between the guide 5 and the stator 1 includes at least the following two situations: the first one is that the guide 5 is connected to the outer edge of the stator 1, then in the radial direction, the guide 5 and the end cover 2 cover the stator 1 and the rotor 4, so as to protect the stator 1 and the rotor 4 at the same time; the second one is that the guide 5 is connected to the inner edge of the stator 1, then in the radial direction, the guide 5 and the end cover 2 only cover the rotor 4, so as to protect the rotor 4. Among them, the outer edge of the stator 1 can be understood as the maximum outer diameter of the stator 1; the inner edge of the stator 1 can be understood as the minimum inner diameter of the stator 1. The radial direction of the stator 1 is indicated by a dotted line b in the figure, and the radial direction of the stator 1 is perpendicular to the first direction.

[0037] The air-cooled permanent magnet motor provided by the utility model embodiment includes a housing, two end covers, a stator, a rotor and a guide, the housing is arranged along a first direction; the two end covers are arranged at intervals in the first direction and fixed to the housing; the stator is arranged in the housing, and a first airflow channel extending in the first direction is formed between the outside of the stator and the housing; a second airflow channel penetrating the stator along the first direction is arranged inside the stator; the rotor is sleeved inside the stator along the first direction, and the output shaft of the rotor penetrates the housing along the first direction; the guide extends along the first direction, and the two ends of the guide in the first direction are respectively connected to the end cover and the stator to guide the airflow through the first airflow channel and the second airflow channel. The utility model embodiment sets the first airflow channel between the outside of the stator and the housing, and sets the second airflow channel inside the stator, so that the motor can dissipate heat from the inside and outside of the stator at the same time, and the stator belongs to the heat source of the motor, so the motor dissipates heat from the inside and outside of the heat source at the same time, which effectively improves the heat dissipation speed of the motor. And by setting the guide between the stator and the end cover, the airflow is introduced into the first airflow channel and the second airflow channel, avoiding the airflow passing through other parts inside the motor, that is, further improving the circulation speed of the airflow.

[0038] In some embodiments, Figure 2 and Figure 3 As shown, the stator 1 includes a stator core 11 and a stator coil 12. The stator core 11 is arranged in the housing 3, and a first airflow channel 100 is formed between the stator core 11 and the housing 3; the stator coil 12 is arranged inside the stator core 11, and a rotor 4 is arranged inside the stator coil 12. The stator core 11 is provided with a second airflow channel 200, so that the second airflow channel 200 avoids the stator coil 12, that is, the setting of the second airflow channel 200 will not interfere with the winding direction of the stator coil 12, so the setting of the second airflow channel 200 can facilitate the production of the stator 1. Among them, the guide 5 is connected to the stator core 11, so that the guide 5 is equivalent to a protective cover, which blocks the airflow outside the guide 5, so that the stator coil 12 and the rotor 4 are protected from the influence of debris in the airflow.

[0039] Therefore, the embodiment of the utility model is convenient to realize by disposing the second airflow channel in the stator core; and connecting the flow guide to the stator core can protect the stator coil and the rotor at the same time.

[0040] In some embodiments, Figure 4 As shown, the stator core 11 includes a magnetic conductive member 111, two pressing rings 112 and a pull plate 113. The magnetic conductive member 111 extends along a first direction, and the inner wall of the magnetic conductive member 111 is provided with a groove 1111 extending along the first direction, and the stator coil 12 (such as Figure 3As shown). For example, the magnetic conductive member 111 includes a plurality of silicon steel sheets stacked along a first direction, and the groove 1111 sequentially penetrates the plurality of silicon steel sheets along the first direction; the silicon steel sheets have good magnetic conductivity, and the magnetic field generated by the stator coil 12 can pass through the silicon steel sheets and act on the rotor, so that the rotor 4 (such as Figure 2 shown) rotation.

[0041] like Figure 4 As shown, two pressing rings 112 are correspondingly arranged at the two ends of the magnetic conductive part 111 in the first direction to limit the movement of the magnetic conductive part 111 in the first direction. Furthermore, in order to limit the radial movement of the magnetic conductive part, at least the following two methods are included: First, a plurality of pull plates 113 are connected between the two pressing rings 112, and the plurality of pull plates 113 are arranged along the circumferential direction, and the circumferential direction is represented by the dotted line c in the figure. Second, the magnetic conductive part 111 is provided with a plurality of strip grooves along the circumferential direction, and the strip grooves are filled by surfacing. Both methods form a squirrel cage structure, and the magnetic conductive part 111 is limited inside the squirrel cage structure.

[0042] Exemplarily, the magnetic conductive member 111 is composed of a plurality of silicon steel sheets stacked along a first direction, and the plurality of stacked silicon steel sheets are confined inside the squirrel cage structure, that is, the plurality of stacked silicon steel sheets and the squirrel cage structure are connected as a whole, which is the stator core 11, thereby facilitating subsequent assembly with the stator coil 12.

[0043] like Figure 4 As shown, the second airflow channel 200 penetrates the magnetic conductive member 111 and the pressing ring 112 along the first direction. For example, the second airflow channel 200 penetrates the pressing ring 112, a plurality of stacked silicon steel sheets, and the pressing ring 112 in sequence along the first direction. The guide member 5 abuts against the pressing ring 112. Further, the guide member 5 (such as Figure 5 As shown) and the pressure ring 112 are connected.

[0044] The stator core of the embodiment of the utility model has a simple structure, is easy to implement, and is convenient for subsequent assembly.

[0045] In some embodiments, Figure 2 and Figure 5 As shown, the guide member 5 abuts against the end surface of the pressing ring 112 in the first direction. Exemplarily, the guide member 5 is a columnar structure extending along the first direction to form an internal hollow structure, and the guide member 5 abuts against the end surface of the pressing ring 112 along the first direction in the circumferential direction. In addition, the guide member 5 is provided with a through hole 50, and the through hole 50 is connected to the second airflow channel 200, so as to introduce the gas into the second airflow channel 200. Exemplarily, the through hole 50 is provided in plurality, and the second airflow channel 200 is provided in plurality, and the plurality of through holes 50 and the plurality of second airflow channels 200 correspond to each other and are connected.

[0046] In the embodiment of the utility model, the guide member is brought into contact with the pressure ring, and a through hole is provided on the guide member to guide the airflow into the second air flow. The overall structure is simple and easy to assemble.

[0047] In some embodiments, Figure 6 As shown, a plurality of first airflow channels 100 and a plurality of second airflow channels 200 are provided, and the first airflow channels 100 and the second airflow channels 200 are evenly distributed around the circumference. The embodiment of the utility model not only helps to improve the heat dissipation speed of the stator by providing a plurality of first airflow channels and second airflow channels, but also can fix the stator to the inner wall of the housing.

[0048] In some embodiments, Figure 5 As shown, a flange 51 is provided at the end of the guide member 5, and the flange 51 is provided with a through hole 50 and a first connecting hole 511. Specifically, the flange 51 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 51 to the inner side of the end of the guide member 5. The first threaded fastener and the second threaded fastener can specifically be screws, bolts, etc. The first connecting hole 511 and the through hole 50 of the flange 51 are staggered in the circumferential direction. The stress concentration formed by the first connecting hole 511 and the through hole 50 being gathered together can be reduced. Therefore, the embodiment of the utility model can reduce the risk of stress concentration of the flange by staggering the first threaded fastener and the through hole, which helps to improve the connection stability of the flange and the pressure ring.

[0049] In some embodiments, Figure 5 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.

[0050] In some embodiments, Figure 7 As shown, the pressure ring 112 is formed with a first step surface M1 at the end along the first direction, 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 providing 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.

[0051] In some embodiments, Figure 2As 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. The first housing 31 is provided with an air inlet 1001 extending in the radial direction, 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 is connected to the first housing 31 and sleeved on the outside of the stator 1; wherein the first housing 31 and the second housing 32 are respectively connected to the two end covers 2; the first airflow channel 100 and the second airflow channel 200 are respectively connected to the air inlet 1001.

[0052] like Figure 2 As shown, the air inlet 1001 has a certain depth along the radial direction, so as to facilitate the connection between the air inlet 1001 and the pipe for introducing gas; in Example 1, the pipe extends into the air inlet 1001 and is threadedly connected to the first shell 31; in Example 2, the pipe is connected to the end face of the first shell 31 radially away from the guide member 5 through a threaded fastener.

[0053] The embodiment of the utility model can conveniently introduce external air into the first air flow channel by arranging the guide member on the first shell, which is convenient for operation.

[0054] In some embodiments, Figure 2 and Figure 7 As shown, 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 1001 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 terminal box assembly 6 on the outside of the second shell. It can be understood that current flows through the copper bar 8, so heat is easily generated. In the embodiment of the utility model, the copper bar is passed through the air inlet, so that the heat of the copper bar can be taken away by the cooling medium in the air inlet.

[0055] 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.

[0056] In some embodiments, Figure 2 and Figure 7As 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.

[0057] 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, a first airflow channel extending along the first direction is formed between the outside of the stator and the housing; a second airflow channel penetrating the stator along the first direction is arranged inside the stator; a rotor, sleeved inside the stator along the first direction, and an output shaft of the rotor passes through the housing along the first direction; The guide member extends along the first direction, and the two ends of the guide member in the first direction are respectively connected to the end cover and the stator to guide the airflow to pass through the first airflow channel and the second airflow channel.

2. The air-cooled permanent magnet motor according to claim 1, characterized in that: The stator comprises: A stator core is disposed in the housing, wherein the first airflow channel is formed between the stator core and the housing; the stator core is provided with the second airflow channel; A stator coil is arranged inside the stator core, and the rotor is arranged inside the stator coil; Wherein, the flow guide is connected to the stator core.

3. The air-cooled permanent magnet motor according to claim 2, characterized in that: The stator core comprises: A magnetic conductive member extending along the first direction, wherein an inner wall of the magnetic conductive member is provided with a groove penetrating along the first direction, and the stator coil is arranged in the groove; Two pressing rings are correspondingly arranged at two ends of the magnetic conductive member in the first direction to limit the movement of the magnetic conductive member in the first direction; Pull plate wherein the second air flow channel penetrates the magnetic conductive member and the pressing ring along the first direction, and the air guide member abuts against the pressing ring.

4. The air-cooled permanent magnet motor according to claim 3, characterized in that: The flow guide member abuts against the end surface of the pressure ring in the first direction, and the flow guide member is provided with a through hole, and the through hole is communicated with the second air flow channel.

5. The air-cooled permanent magnet motor according to any one of claims 1 to 4, characterized in that: A plurality of the first airflow channels and a plurality of the second airflow channels are provided, and the first airflow channels and the second airflow channels are evenly distributed around the circumference.

6. The air-cooled permanent magnet motor according to claim 1, characterized in that: The housing comprises: A first shell, which is sleeved on the outer side of the guide member, and the first shell is provided with an air inlet; A second housing connected to the first housing, wherein the second housing is sleeved on the outer side of the stator; The first shell and the second shell are respectively connected to the two end covers; the air inlet extends along the radial direction of the stator, and the first air flow channel and the second air flow channel are respectively connected to the air inlet.

7. The air-cooled permanent magnet motor according to claim 6, 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.

8. The air-cooled permanent magnet motor according to claim 7, 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.

9. The air-cooled permanent magnet motor according to claim 4, characterized in that: A flange is arranged at the end of the flow guide, and the flange and the pressure ring are connected by a threaded fastener, and the threaded fastener and the through hole are staggered in the circumferential direction.

10. The air-cooled permanent magnet motor according to claim 9, characterized in that: The pressure ring has a first step surface formed at the end along the first direction, 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.

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