Permanent magnet motor with sealing and heat dissipation structure

Abstract

This invention provides a permanent magnet motor with a sealing and heat dissipation structure, including a frame, a drive shaft, a drive end cooling component, a positioning end cooling component, and an electromagnetic drive component. The frame includes a receiving cavity and a cooling channel, with the cooling channel surrounding the receiving cavity. The drive shaft passes through the frame. The drive end cooling component is located at one end of the frame and includes a first sealing component disposed between the frame and the drive shaft. The positioning end cooling component is located at the other end of the frame and includes a second sealing component disposed between the frame and the drive shaft. The electromagnetic drive component is located within the receiving cavity and connected to the drive shaft. This invention provides a permanent magnet motor with a sealing and heat dissipation structure, ensuring high power and high heat dissipation while maintaining reliable sealing, a more compact structure, increased power density, and improved operating efficiency.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet drive technology, and more specifically, to a permanent magnet motor with a sealing and heat dissipation structure. Background Technology

[0002] Traction motors provide the core driving force for railway trains. Trains operate in harsh environments, often accompanied by wind, sand, rain, snow, fog, and haze, and occasionally salt spray, acid rain, and sandstorms. Therefore, railway motors typically employ a fully enclosed structure to prevent dust, particles, and other impurities from entering the motor and ensuring its normal operation. This is especially true for permanent magnet motors. If air enters directly into the motor, the moisture, dust, and other pollutants it carries will corrode the permanent magnets, accelerating their failure and shortening the motor's lifespan. Simultaneously, external metal shavings entering the motor and adhering to the magnetic rotor surface can cause scorching, leading to motor burnout. Therefore, permanent magnet motors must employ a fully enclosed structure. When the power of a permanent magnet motor is high, the heat generated is significant, and ordinary air-cooled structures cannot simultaneously meet the requirements of a fully enclosed structure, high heat dissipation, and high power density.

[0003] Therefore, designing a fully enclosed permanent magnet motor structure with large heat dissipation and compact structure to solve the above-mentioned defects has become an urgent technical problem to be solved. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this invention is to provide a permanent magnet motor with a sealing and heat dissipation structure.

[0005] This invention provides a permanent magnet motor with a sealing and heat dissipation structure, comprising:

[0006] A base includes a receiving cavity and a cooling channel, the cooling channel being arranged around the receiving cavity for passing through cooling air;

[0007] A drive shaft is installed through the base;

[0008] A transmission end cooling assembly is disposed at one end of the base. The transmission end cooling assembly includes a first sealing assembly, which is disposed between the base and the transmission shaft to prevent air from entering the receiving cavity.

[0009] A positioning end cooling component is disposed at the other end of the base. The positioning end cooling component includes a second sealing component, which is disposed between the base and the drive shaft to prevent air from entering the receiving cavity.

[0010] An electromagnetic drive assembly is disposed within the receiving cavity and connected to the drive shaft, for driving the drive shaft to rotate.

[0011] Preferably, the first sealing assembly includes:

[0012] The transmission end bearing is connected to both the transmission shaft and the machine base.

[0013] The rear bearing cover is connected to both the transmission end bearing and the machine base, and is located on the side of the machine base away from the receiving cavity. The rear bearing cover is provided with a plurality of first sealing grooves at intervals.

[0014] A transmission sealing ring is connected to the transmission end bearing, the transmission shaft, and the rear bearing cover. The transmission sealing ring is located on the side of the transmission end bearing away from the receiving cavity. The transmission sealing ring has a plurality of first stepped surfaces, and the outer diameter of the plurality of first stepped surfaces gradually increases from one end of the transmission sealing ring near the receiving cavity to the other end. The rear bearing cover is adapted to fit the transmission sealing ring.

[0015] Preferably, the base includes:

[0016] The outer casing is connected to the cooling assembly at the transmission end, and the receiving cavity is disposed on the outer casing. A first cooling channel is provided on one side of the receiving cavity on the outer casing.

[0017] The inner end cap is connected to both the outer shell and the positioning end cooling assembly.

[0018] The front end cover is connected to both the outer shell and the positioning end cooling assembly. The front end cover is located on the side of the inner end cover away from the receiving cavity. A second cooling channel is formed between the front end cover and the inner end cover. The second cooling channel communicates with the first cooling channel and together with the first cooling channel forms the cooling channel. The air inlet of the cooling channel is located on the front end cover.

[0019] Preferably, the transmission end cooling assembly further includes:

[0020] A rear auxiliary fan is disposed within the receiving cavity and is simultaneously connected to the drive shaft, the housing, and the drive end bearing. The rear auxiliary fan has a plurality of spaced first protrusions on the side near the housing, and the housing has a plurality of first slots that engage with the first protrusions. The drive shaft drives the rear auxiliary fan to rotate, and the rear auxiliary fan is used to circulate air within the receiving cavity and dissipate heat.

[0021] Preferably, the positioning end cooling component further includes:

[0022] A front auxiliary fan is disposed in the receiving cavity and is simultaneously connected to the drive shaft and the inner end cover. The front auxiliary fan has a second slot on the side near the inner end cover, and the inner end cover has a second protrusion that engages with the second slot. The drive shaft drives the front auxiliary fan to rotate. The front auxiliary fan is used to circulate air in the receiving cavity and dissipate heat.

[0023] The main fan is located in the second cooling channel and is connected to the drive shaft, the inner end cover, the front end cover and the second sealing assembly. The main fan has several third slots spaced apart on the side near the front end cover. The front end cover has third protrusions that are adapted to the third slots. The drive shaft drives the main fan to rotate. The main fan is used to make the air flow in the cooling channel, draw cold air into the cooling channel and then dissipate heat.

[0024] Preferably, the second sealing assembly includes:

[0025] A positioning bearing cover is connected to the inner end cover and is disposed on the side of the inner end cover away from the receiving cavity. The positioning bearing cover is provided with a plurality of second sealing grooves at intervals.

[0026] A positioning end bearing is connected to the positioning bearing cover, the inner end cover, and the drive shaft. The positioning end bearing is located on the side of the inner end cover away from the receiving cavity.

[0027] The fan base is connected to the drive shaft, the positioning bearing cover, and the main fan. The fan base is located on the side of the positioning bearing away from the receiving cavity. The fan base has several second stepped surfaces, and the outer diameter of the several second stepped surfaces gradually increases from one end of the fan base near the receiving cavity to the other end. The positioning bearing cover is adapted to fit the fan base.

[0028] Preferably, the permanent magnet motor with a sealing and heat dissipation structure further includes:

[0029] A rotary transformer, which is connected to both the front end cover and the drive shaft;

[0030] A filter screen is connected to the front cover and is disposed on the air inlet.

[0031] Preferably, the drive shaft passes through the rear auxiliary fan, and a first positioning protrusion is provided at one end of the rear auxiliary fan away from the drive shaft. The housing is also provided with a first positioning groove, and the first positioning protrusion engages with the first positioning groove.

[0032] Preferably, the inner end cover is provided with a second positioning protrusion, and the main fan is provided with a through hole communicating with the second cooling channel. The through hole abuts against the second positioning protrusion near the side wall of the inner end cover.

[0033] Preferably, the first cooling channel is arranged parallel to the drive shaft, and the air outlet of the cooling channel is located at one end of the housing near the drive end cooling component.

[0034] The above-described solution of this invention enables the establishment of a fully enclosed structure for permanent magnet motors under high power density and large heat dissipation requirements. This device employs a heat dissipation and sealing structure that works in conjunction with the permanent magnet motor fan. It eliminates the need for conventional rear outer sealing ring, front inner sealing ring, and front outer sealing ring bearing sealing components. The sealing and heat dissipation functions of the rear auxiliary fan, front auxiliary fan, fan base, and main fan are integrated. The cooling structure is improved to form a first sealing component and a second sealing component. These components, along with the base, provide sealing protection for the structure within the housing. Simultaneously, the cooling channel design ensures reliable sealing while maintaining high motor power and heat dissipation, significantly reducing the overall axial dimensions of the machine, resulting in a more compact structure, increased motor power density, and further improved motor operating efficiency.

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This diagram illustrates a permanent magnet motor with a sealing and heat dissipation structure according to an embodiment of the present invention.

[0038] Figure 2 This diagram illustrates the structure of a cooling assembly for the drive end of a permanent magnet motor with a sealing and heat dissipation structure, as provided in an embodiment of the present invention.

[0039] Figure 3 This diagram illustrates the structure of a positioning end cooling assembly for a permanent magnet motor with a sealing and heat dissipation structure, as provided in an embodiment of the present invention.

[0040] icon:

[0041] 1. Base; 2. Drive shaft; 3. Drive end cooling assembly; 4. Positioning end cooling assembly; 5. Electromagnetic drive assembly; 6. Rotary transformer; 7. Filter screen; 11. Housing; 12. Inner end cover; 13. Front end cover; 31. First sealing assembly; 32. Rear auxiliary fan; 33. Bearing grease; 41. Second sealing assembly; 42. Front auxiliary fan; 43. Main fan; 81. First labyrinth section; 82. Second labyrinth section; 83. Third labyrinth section; 84. Fourth labyrinth section; 85. Fifth labyrinth section; 111. Receiving cavity; 112. First cooling channel; 113. Air outlet; 131. Second cooling channel; 132. Air inlet; 311. Drive end bearing; 312. Rear bearing cover; 313. Drive sealing ring; 411. Positioning bearing cover; 412. Positioning end bearing; 413. Fan seat; 431. Through hole. Detailed Implementation

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limitations on this invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] Please refer to the following: Figures 1 to 3This invention provides a specific embodiment of a permanent magnet motor with a sealing and heat dissipation structure. The permanent magnet motor with a sealing and heat dissipation structure includes a base 1, a drive shaft 2, a drive end cooling assembly 3, a positioning end cooling assembly 4, and an electromagnetic drive assembly 5. The base 1 includes a receiving cavity 111 and a cooling channel, the cooling channel surrounding the receiving cavity 111 for cooling air passage. The drive shaft 2 passes through the base 1. The drive end cooling assembly 3 is located at one end of the base 1 and includes a first sealing assembly 31, which is positioned between the base 1 and the drive shaft 2 to prevent air from entering the receiving cavity 111. The positioning end cooling assembly 4 is located at the other end of the base 1 and includes a second sealing assembly 41, which is positioned between the base 1 and the drive shaft 2 to prevent air from entering the receiving cavity 111. The electromagnetic drive assembly 5 is located within the receiving cavity 111 and connected to the drive shaft 2, for driving the drive shaft 2 to rotate.

[0046] The cooling component 3 at the transmission end and the cooling component 4 at the positioning end are connected through the base 1. The first sealing component 31, the second sealing component 41, the transmission shaft 2 and the base 1 cooperate to make the receiving cavity 111 a fully enclosed sealed cavity. Air, oil or other pollutants will not enter the receiving cavity 111, which provides good protection for the electromagnetic drive component 5. External natural wind enters the outer cavity of the motor, i.e. the cooling channel, through the filter screen 7 to dissipate heat from the base 1 and the electromagnetic drive component 5, forming a structure in which the inner cavity of the whole machine, i.e. the receiving cavity 111, is fully enclosed and the outer cavity is self-ventilated. The key components are completely protected by the sealing structure. The overall structure is compact and at the same time greatly improves the heat dissipation of the motor.

[0047] Compared with existing technologies, this permanent magnet motor with sealing and heat dissipation structure eliminates the use of conventional sealing structures in motors. The cooling structure is improved to obtain a first sealing component 31 and a second sealing component 41. The first sealing component 31 and the second sealing component 41 are used in conjunction with the base 1 to seal and protect the structure inside the receiving cavity 111. At the same time, with the setting of cooling channels, while ensuring high power and high heat dissipation of the motor, the sealing is reliable, which greatly saves the axial dimension of the whole machine, increases the power density of the motor, and further improves the operating efficiency of the motor.

[0048] As another embodiment of the present invention, the structure of this permanent magnet motor with sealing and heat dissipation structure is basically the same as that in the above embodiments, except that the first sealing assembly 31 includes a transmission end bearing 311, a rear bearing cover 312, and a transmission sealing ring 313. The transmission end bearing 311 is connected to both the transmission shaft 2 and the base 1 to ensure the smooth rotation of the transmission shaft 2. The rear bearing cover 312 is connected to both the transmission end bearing 311 and the base 1 and is located on the side of the base 1 away from the receiving cavity 111. The upper part is provided with several first sealing grooves at intervals. The rear bearing cover 312 cooperates with the base 1 to fix the transmission end bearing 311. The transmission sealing ring 313 is connected to the transmission end bearing 311, the transmission shaft 2 and the rear bearing cover 312. The transmission sealing ring 313 is located on the side of the transmission end bearing 311 away from the receiving cavity 111. The transmission sealing ring 313 is provided with several first stepped surfaces. The outer diameter of the several first stepped surfaces gradually increases from one end of the transmission sealing ring 313 near the receiving cavity 111 to the other end. The rear bearing cover 312 is adapted to fit the transmission ring 313. The first sealing grooves and the first stepped surfaces cooperate to form the first labyrinth part 81.

[0049] As another embodiment of the present invention, the structure of this permanent magnet motor with sealing and heat dissipation structure is basically the same as that in the above embodiment. The difference is that the base 1 includes a shell 11, an inner end cover 12 and a front end cover 13. The shell 11 is connected to the transmission end cooling component 3. The receiving cavity 111 is disposed on the shell 11. A first cooling channel 112 is provided on one side of the receiving cavity 111 on the shell 11. The inner end cover 12 is connected to both the shell 11 and the positioning end cooling component 4. The front end cover 13 is connected to both the shell 11 and the positioning end cooling component 4. The front end cover 13 is disposed on the side of the inner end cover 12 away from the receiving cavity 111. A second cooling channel 131 is formed between the front end cover 13 and the inner end cover 12. The second cooling channel 131 communicates with the first cooling channel 112 and together with the first cooling channel 112 forms a cooling channel. The air inlet 132 of the cooling channel is disposed on the front end cover 13.

[0050] In this embodiment, the first cooling channel 112 is arranged parallel to the drive shaft 2, and the air outlet 113 of the cooling channel is located at one end of the outer casing 11 near the transmission end cooling component 3. This arrangement effectively separates the receiving cavity 111 and the cooling channel, while also providing better cooling effect for the receiving cavity 111 and a more compact structure.

[0051] As another embodiment of the present invention, the structure of the permanent magnet motor with sealing and heat dissipation structure is basically the same as that in the above embodiment. The difference is that the permanent magnet motor with sealing and heat dissipation structure also includes a rotary transformer 6 and a filter screen 7. The rotary transformer 6 is connected to both the front cover 13 and the drive shaft 2. The filter screen 7 is connected to the front cover 13 and is disposed on the air inlet 132 to filter impurities in the cooling air, prevent impurities from blocking the motor, and ensure the stability and service life of the motor operation.

[0052] As another embodiment of the present invention, the structure of this permanent magnet motor with sealing and heat dissipation structure is basically the same as that in the above embodiments. The difference is that the transmission end cooling component 3 also includes a rear auxiliary fan 32. The rear auxiliary fan 32 is disposed in the receiving cavity 111 and is connected to the transmission shaft 2, the housing 11 and the transmission end bearing 311. The rear auxiliary fan 32 has a number of spaced first protrusions on the side near the housing 11, and the housing 11 has a number of first slots that engage with the first protrusions. The transmission shaft 2 drives the rear auxiliary fan 32 to rotate. The rear auxiliary fan 32 is used to circulate air in the receiving cavity 111 and dissipate heat. The outer periphery of the transmission end bearing 311 is provided with bearing grease 33 to improve the bearing's working efficiency. The first protrusions and the first slots cooperate to form a second labyrinth part 82. This structure eliminates the rear inner sealing ring component of the conventional structure. The rear auxiliary fan 32 has both sealing and heat dissipation functions, shortens the axial length of the motor, and improves the internal heat dissipation efficiency of the motor.

[0053] In this embodiment, the drive shaft 2 passes through the rear auxiliary fan 32. A first positioning protrusion is provided at the end of the rear auxiliary fan 32 away from the drive shaft 2, and a first positioning groove is also provided on the outer casing 11. The first positioning protrusion engages with the first positioning groove. This structure, on the one hand, limits the rear auxiliary fan 32 to ensure operational stability, and on the other hand, further seals the side of the rear auxiliary fan 32 away from the receiving cavity 111, further improving the sealing effect. The first positioning protrusion is an annular protrusion with the drive shaft 2 as its rotation center, and the first positioning groove is an annular groove adapted to the first positioning protrusion.

[0054] As another embodiment of the present invention, the structure of the permanent magnet motor with sealing and heat dissipation structure is basically the same as that in the above embodiment. The difference is that the positioning end cooling component 4 also includes a front auxiliary fan 42 and a main fan 43. The front auxiliary fan 42 is disposed in the receiving cavity 111 and is connected to the drive shaft 2 and the inner end cover 12. The front auxiliary fan 42 is provided with a second slot on the side near the inner end cover 12. The inner end cover 12 is provided with a second protrusion that engages with the second slot. The drive shaft 2 drives the front auxiliary fan 42 to rotate. The front auxiliary fan 42 is used to circulate the air in the receiving cavity 111 and dissipate heat. The main fan 43 is disposed in the second cooling channel 131 and is connected to the drive shaft 2, the inner end cover 12, the front end cover 13 and the second sealing component 41. The side of the main fan 43 near the front end cover 13 is provided with a plurality of third slots at intervals. The front end cover 13 is provided with a third protrusion that matches the third slot. The drive shaft 2 drives the main fan 43 to rotate. The main fan 43 is used to circulate the air in the cooling channel, draw cold air into the cooling channel and dissipate heat.

[0055] The second slot and the second protrusion cooperate to form the third labyrinth section 83. This structure eliminates the front inner sealing ring component of the conventional structure. The front auxiliary fan 42 has both sealing and heat dissipation functions, shortens the axial length of the motor, and improves the internal heat dissipation efficiency of the motor. The third slot and the third protrusion cooperate to form the fifth labyrinth section 85. This structure seals the operating space of the rotary transformer 6 to prevent contaminants from entering and improves the reliability of the rotary transformer 6.

[0056] In this embodiment, the inner end cover 12 is provided with a second positioning protrusion, and the main fan 43 is provided with a through hole 431 communicating with the second cooling channel 131. The through hole 431 abuts against the side wall of the inner end cover 12. This structure blocks the cooling air on the side of the main fan 43 away from the receiving cavity 111, initially blocking the cooling air and achieving the effect of initial sealing.

[0057] As another embodiment of the present invention, the structure of this permanent magnet motor with sealing and heat dissipation structure is basically the same as that in the above embodiment, except that the second sealing assembly 41 includes a positioning bearing cover 411, a positioning end bearing 412, and a fan seat 413. The positioning bearing cover 411 is connected to the inner end cover 12 and is located on the side of the inner end cover 12 away from the receiving cavity 111. The positioning bearing cover 411 is provided with a plurality of second sealing grooves at intervals. The positioning end bearing 412 is simultaneously connected to the positioning bearing cover 411 and the inner end cover 12. The end cover 12 is connected to the drive shaft 2, and the positioning end bearing 412 is located on the side of the inner end cover 12 away from the receiving cavity 111. The fan seat 413 is connected to the drive shaft 2, the positioning bearing cover 411 and the main fan 43. The fan seat 413 is located on the side of the positioning end bearing 412 away from the receiving cavity 111. The fan seat 413 is provided with a number of second step surfaces. The outer diameter of the number of second step surfaces gradually increases from one end of the fan seat 413 near the receiving cavity 111 to the other end. The positioning bearing cover 411 is adapted to fit the fan seat 413.

[0058] The second sealing groove and the second step surface cooperate to form the fourth labyrinth section 84. This structure eliminates the front outer sealing ring component of the conventional structure. The fan seat 413 has both sealing and main fan 43 fixing functions, further shortening the axial length of the motor and making the whole structure more compact.

[0059] The traction motor rotates, driving the rear auxiliary fan 32 and the front auxiliary fan 42, which are mounted on the drive shaft 2, to rotate at high speed, increasing the airflow inside the cavity and accelerating the removal of heat from the cavity. External axial-flow main fan 43 draws in external cooling air and exhausts internal hot air, achieving efficient heat dissipation for the entire machine.

[0060] Compared with the prior art, the first labyrinth section 81, the transmission end bearing 311, and the second labyrinth section 82 of this permanent magnet motor with sealing and heat dissipation structure cooperate with each other to form a transmission end sealing structure, preventing external contaminants from entering the inner cavity of the motor, i.e., the receiving cavity 111, and at the same time, also preventing bearing grease and oil stains from entering the inner cavity of the motor; the third labyrinth section 83, the positioning end bearing 412, and the fourth labyrinth section 84 cooperate with each other to form a non-transmission end sealing structure, preventing external contaminants from entering the inner cavity of the motor, i.e., the receiving cavity 111, and at the same time, also preventing bearing grease and oil stains from entering the inner cavity of the motor. Both the transmission end sealing structure and the non-transmission end sealing structure adopt the method of sealing by bearing and labyrinth part. The rear auxiliary fan 32 also functions as a rear outer sealing ring structure, the front auxiliary fan 42 also functions as a front inner sealing ring structure, and the fan base 413 also functions as a front outer sealing ring structure. At the same time, a fifth labyrinth part 85 is added to form by the main fan 43 and the front cover 13 to seal the operating space of the rotary transformer 6. While ensuring the high power and high heat dissipation of the motor, the sealing is reliable, which greatly saves the axial dimension of the whole machine, increases the power density of the motor, and further improves the operating efficiency of the motor.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A permanent magnet motor with a sealing and heat dissipation structure, characterized in that, include: The base (1) includes a receiving cavity (111) and a cooling channel, the cooling channel being arranged around the receiving cavity (111) for passing through cooling air; A drive shaft (2) is provided, which passes through the base (1); The transmission end cooling component (3) is disposed at one end of the base (1). The transmission end cooling component (3) includes a first sealing component (31), which is disposed between the base (1) and the transmission shaft (2) to prevent air from entering the accommodating cavity (111). The positioning end cooling component (4) is disposed at the other end of the base (1). The positioning end cooling component (4) includes a second sealing component (41), which is disposed between the base (1) and the drive shaft (2) to prevent air from entering the receiving cavity (111). An electromagnetic drive assembly (5) is disposed in the receiving cavity (111) and connected to the drive shaft (2) for driving the drive shaft (2) to rotate; The base (1) includes an inner end cover (12) and a front end cover (13); The positioning end cooling component (4) includes a main fan (43); The second sealing assembly (41) includes: The positioning bearing cover (411) is connected to the inner end cover (12) and is located on the side of the inner end cover (12) away from the receiving cavity (111). The positioning bearing cover (411) is provided with a plurality of second sealing grooves at intervals. The positioning end bearing (412) is connected to the positioning bearing cover (411), the inner end cover (12) and the transmission shaft (2). The positioning end bearing (412) is located on the side of the inner end cover (12) away from the receiving cavity (111). The fan seat (413) is connected to the drive shaft (2), the positioning bearing cover (411) and the main fan (43). The fan seat (413) is located on the side of the positioning end bearing (412) away from the receiving cavity (111). The fan seat (413) is provided with a plurality of second step surfaces. The outer diameter of the plurality of second step surfaces increases gradually from one end of the fan seat (413) close to the receiving cavity (111) to the other end. The positioning bearing cover (411) is adapted to the fan seat (413). A rotary transformer (6) is connected to both the front end cover (13) and the drive shaft (2); The filter screen (7) is connected to the front cover (13) and is disposed on the air inlet (132) of the cooling channel.

2. A permanent magnet motor with a sealing and heat dissipation structure according to claim 1, characterized in that, The first sealing assembly (31) includes: The transmission end bearing (311) is connected to both the transmission shaft (2) and the machine base (1); The rear bearing cover (312) is connected to both the transmission end bearing (311) and the machine base (1) and is located on the side of the machine base (1) away from the receiving cavity (111). The rear bearing cover (312) is provided with a plurality of first sealing grooves at intervals. The transmission sealing ring (313) is connected to the transmission end bearing (311), the transmission shaft (2), and the rear bearing cover (312). The transmission sealing ring (313) is located on the side of the transmission end bearing (311) away from the receiving cavity (111). The transmission sealing ring (313) is provided with a plurality of first stepped surfaces. The outer diameter of the plurality of first stepped surfaces gradually increases from one end of the transmission sealing ring (313) close to the receiving cavity (111) to the other end. The rear bearing cover (312) is adapted to the transmission sealing ring (313).

3. A permanent magnet motor with a sealing and heat dissipation structure according to claim 2, characterized in that, The base (1) also includes: The outer shell (11) is connected to the transmission end cooling assembly (3), the receiving cavity (111) is disposed on the outer shell (11), and a first cooling channel (112) is provided on one side of the receiving cavity (111) on the outer shell (11). The inner end cap (12) is connected to both the outer shell (11) and the positioning end cooling assembly (4); The front end cover (13) is connected to both the outer shell (11) and the positioning end cooling component (4). The front end cover (13) is located on the side of the inner end cover (12) away from the receiving cavity (111). A second cooling channel (131) is formed between the front end cover (13) and the inner end cover (12). The second cooling channel (131) is connected to the first cooling channel (112) and together with the first cooling channel (112) forms the cooling channel. The air inlet (132) of the cooling channel is located on the front end cover (13).

4. A permanent magnet motor with a sealing and heat dissipation structure according to claim 3, characterized in that, The transmission end cooling component (3) also includes: The rear auxiliary fan (32) is disposed in the receiving cavity (111) and is simultaneously connected to the drive shaft (2), the housing (11) and the transmission end bearing (311). The rear auxiliary fan (32) has a number of spaced first protrusions on the side near the housing (11). The housing (11) has a number of first slots that engage with the first protrusions. The drive shaft (2) drives the rear auxiliary fan (32) to rotate. The rear auxiliary fan (32) is used to make the air in the receiving cavity (111) flow and dissipate heat.

5. A permanent magnet motor with a sealing and heat dissipation structure according to claim 4, characterized in that, The positioning end cooling component (4) also includes: A front auxiliary fan (42) is disposed in the receiving cavity (111) and is connected to both the drive shaft (2) and the inner end cover (12). The front auxiliary fan (42) has a second slot on the side near the inner end cover (12), and the inner end cover (12) has a second protrusion that engages with the second slot. The drive shaft (2) drives the front auxiliary fan (42) to rotate. The front auxiliary fan (42) is used to circulate air in the receiving cavity (111) and dissipate heat. The main fan (43) is located in the second cooling channel (131) and is connected to the drive shaft (2), the inner end cover (12), the front end cover (13) and the second sealing assembly (41). The main fan (43) has several third slots spaced apart on the side near the front end cover (13). The front end cover (13) has a third protrusion that matches the third slot. The drive shaft (2) drives the main fan (43) to rotate. The main fan (43) is used to make the air in the cooling channel flow, draw cold air into the cooling channel and then dissipate heat.

6. A permanent magnet motor with a sealing and heat dissipation structure according to claim 5, characterized in that, The drive shaft (2) passes through the rear auxiliary fan (32). The rear auxiliary fan (32) has a first positioning protrusion at one end away from the drive shaft (2). The outer shell (11) also has a first positioning groove. The first positioning protrusion engages with the first positioning groove.

7. A permanent magnet motor with a sealing and heat dissipation structure according to claim 6, characterized in that, The inner end cover (12) is provided with a second positioning protrusion, and the main fan (43) is provided with a through hole (431) communicating with the second cooling channel (131). The through hole (431) is close to the side wall of the inner end cover (12) and abuts against the second positioning protrusion.

8. A permanent magnet motor with a sealing and heat dissipation structure according to claim 7, characterized in that, The first cooling channel (112) is arranged parallel to the drive shaft (2), and the air outlet (113) of the cooling channel is located at one end of the outer shell (11) near the drive end cooling component (3).

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