High-sealing permanent magnet synchronous motor

Abstract

The utility model discloses high sealing permanent magnet synchronous motor, including setting in the stator subassembly of casing and with the coaxial connection of rotor subassembly's rotating shaft, the open end of casing one end is equipped with the opening that rotating shaft goes out, and its other end is the closed end of closed setting, and the seal cover structure is arranged between open end and rotating shaft, and the seal cover structure includes the outer cover sealing portion of embedding in the limit groove of open end inboard formation, and the inner cover sealing portion of setting on the rotating shaft, and the inner cover sealing portion is through the ring structure and is held tightly in the rotating shaft and forms dynamic sealing connection, and the permanent magnet synchronous motor of adopting this technical scheme forms the double sealing mechanism of dynamic and static combination between open end and rotating shaft through above-mentioned seal cover structure, and finally forms the overall sealing pattern of " only rotating shaft goes out end has sealing, and the rest are all closed", so all external channels of impurity invasion motor inside are cut off from space, and the motor overall sealing performance is improved significantly, and the product use performance and life are improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a high-sealing permanent magnet synchronous motor. Background Technology

[0002] A permanent magnet synchronous motor is a synchronous motor that uses permanent magnets to establish an excitation magnetic field. It boasts advantages such as high efficiency, high power density, excellent torque characteristics, and good control performance, and is widely used in industrial drives, electric vehicles, home appliances, aerospace, and other fields. Its basic structure consists of three main parts: the stator, the rotor, and the permanent magnets. The stator typically comprises an iron core and three-phase windings, responsible for generating the rotating magnetic field; the rotor embeds permanent magnets and rotates synchronously with the stator's magnetic field through magnetic coupling, thereby achieving electromechanical energy conversion.

[0003] In recent years, with the increasing demands on motor performance in industrial applications, permanent magnet synchronous motors (PMSMs) often need to work in conjunction with mechanical transmission components such as gearboxes. In these applications, the motors typically require excellent heat dissipation and environmental adaptability, often immersing the PSM casing in oil for cooling. However, oil cooling also presents new technical challenges. Gearboxes inevitably experience wear during operation, generating metal particles or iron filings. These impurities enter the motor's interior with the circulating oil. Due to the strong magnetism of permanent magnets, these magnetic impurities readily attract iron filings and other magnetic contaminants. Over time, these impurities can cause uneven air gaps, magnetic field distortion, increased motor vibration and noise, and in severe cases, even short circuits in the windings and bearing damage, significantly impacting the motor's reliability, efficiency, and lifespan. Therefore, traditional non-sealed or semi-sealed structures are no longer sufficient to meet the demands of high-reliability applications. Utility Model Content Therefore, the technical problem to be solved by this utility model is to overcome the problem that permanent magnet synchronous motors in the prior art are prone to attracting magnetic impurities such as iron filings. These impurities cause increased motor vibration and noise, and in severe cases, even lead to short circuits in the windings, damage to the bearings, and other faults, affecting the service life of the motor.

[0004] To solve the above-mentioned technical problems, this utility model provides a high-sealing permanent magnet synchronous motor, including a housing, a stator assembly and a rotor assembly disposed within the housing, and a rotating shaft coaxially connected to the rotor assembly. One end of the housing is provided with an open end through which the rotating shaft passes, and the other end is a closed end. A sealing sleeve structure is provided between the open end and the rotating shaft. The sealing sleeve structure includes an outer sealing part embedded in a limiting groove formed inside the open end, and an inner sealing part extending axially along the rotating shaft and sleeved on the rotating shaft. The inner sealing part is tightly held to the rotating shaft by a retaining ring structure to form a dynamic sealing connection. The outer sealing part contacts the inner wall of the open end to form a circumferential sealing connection.

[0005] As a preferred embodiment, the sealing sleeve structure includes a central sealing piece connected between the inner sealing part and the outer sealing part, and the inner sealing part, the central sealing piece, and the outer sealing part together form an annular buffer groove, with the inner sealing part and the outer sealing part on both sides of the annular buffer groove respectively.

[0006] As a preferred embodiment, the retaining ring structure is an annular elastic retaining ring sleeved on the outside of the inner sleeve sealing part and housed in the annular buffer groove. The annular elastic retaining ring applies a radial compressive force to the inner sleeve sealing part, tightly gripping the rotating shaft.

[0007] As a preferred embodiment, the outer peripheral wall of the inner sleeve sealing part is provided with a retaining ring groove for positioning and installing the retaining ring structure.

[0008] As a preferred embodiment, the inner peripheral wall of the inner sleeve sealing part is provided with at least one sealing protrusion that is in close contact with the rotating shaft.

[0009] As a preferred embodiment, the housing includes an upper end cover and a lower end cover installed at both ends thereon. The upper end cover and the lower end cover are respectively fixed to both ends of the housing by multiple sets of bolts, and the upper end cover has an opening in the middle. The lower end cover seals the other end of the housing to form the closed end.

[0010] As a preferred embodiment, the open end is provided with a first bearing that cooperates with the rotating shaft. The open end includes an annular step disposed on its inner wall and opposite to the first bearing, and a limiting groove formed between the annular step and the first bearing. The outer sealing sleeve is fitted in the limiting groove and is in close contact with the annular step.

[0011] As a preferred embodiment, the inner side of the lower end cover is formed with a groove structure opposite to the opening end, and a second bearing that cooperates with the rotating shaft is embedded in the groove structure, and the first bearing and the second bearing are coaxially opposite each other.

[0012] As a preferred embodiment, the upper cover has a first inner flange extending into the housing. A first sealing ring is provided at the junction of the first inner flange and the inner wall of one end of the housing. A sealing groove for accommodating the first sealing ring is provided on the outer peripheral wall of the first inner flange. The first inner flange is pressed into one end of the housing to form a static seal by compressing the first sealing ring.

[0013] As a preferred embodiment, the lower end cover has a second inner flange extending into the housing. A second sealing ring is provided at the junction of the second inner flange and the inner wall of the other end of the housing. A sealing groove for accommodating the second sealing ring is provided on the outer peripheral wall of the second inner flange. The second inner flange is pressed into the other end of the housing and forms a static seal by compressing the second sealing ring.

[0014] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art: 1. In the high-sealing permanent magnet synchronous motor provided by this utility model, the housing adopts an overall design with one end open and sealed and the other end closed. A sealing sleeve structure is set between the open end of the housing and the rotating shaft. This sealing sleeve structure is divided into an inner sealing part and an outer sealing part. The outer sealing part is embedded in the limiting groove formed on the inner side of the open end. The limiting groove ensures that the sealing sleeve will not move axially or radially when the motor vibrates during operation. The outer sealing part contacts the inner wall of the open end to form a circumferential sealing connection, realizing the static sealing between the sealing sleeve structure and the open end; and the inner sealing part is held tightly to the rotating shaft by a retaining ring structure to form a dynamic sealing connection. The sealing sleeve provides a continuous and uniform radial pressure, ensuring that the inner sealing part is always in close contact with the shaft surface. This design allows the shaft to remain tightly sealed while rotating, effectively preventing oil and impurities from entering through the gap between the shaft and the housing. The permanent magnet synchronous motor with this structure forms a dynamic and static dual sealing mechanism between the open end and the shaft through the above-mentioned sealing sleeve structure, ultimately forming an overall sealing pattern of "only the shaft protrusion end is sealed, and the rest are closed". This spatially cuts off all external channels for impurities to enter the motor, significantly improving the overall sealing performance of the motor, improving product performance and lifespan, and is suitable for high vibration and high speed conditions.

[0015] 2. In the high-sealing permanent magnet synchronous motor provided by this utility model, a uniform and continuous radial clamping force is applied to the inner sleeve sealing part by designing an annular elastic retaining ring. This radial clamping force is evenly distributed along the circumference, so that the inner sleeve sealing part can fit tightly against the shaft surface in all directions, avoiding gaps caused by insufficient local fit, completely blocking the intrusion path of impurities along the shaft surface, and can adaptively compensate for the dimensional fluctuations of the shaft caused by temperature changes or slight eccentricity. That is, when the elastic retaining ring is affected by the slight fluctuations of the shaft, it adaptively adjusts through elastic deformation to maintain a stable radial extrusion force, avoids the attenuation of clamping force, thereby maintaining the stability of sealing pressure and significantly extending the sealing life of the sealing sleeve structure.

[0016] 3. In the high-sealing permanent magnet synchronous motor provided by this utility model, the upper end cover forms an annular sidewall contact with the housing through the first inner flange, increasing the sealing joint area. By setting a sealing groove on the first inner flange and installing the first sealing ring, when the upper end cover is fixed to the housing by bolts, it will drive the first inner flange to be pressed into one end of the housing, so that the first sealing ring is subjected to radial compression by the first inner flange and the inner wall of the housing, generating a uniform rebound force, thereby tightly filling all gaps between the first inner flange and the inner wall of the housing, achieving a reliable and uniform circumferential static seal. In this technical solution, the upper end cover and the lower end cover are installed with the housing in the same way to achieve sealing, which can effectively prevent external oil, dust and other impurities from entering the motor from the joint gap between the housing and the upper end cover, further improving the sealing performance of the permanent magnet synchronous motor. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 A cross-sectional structural schematic diagram of the high-sealing permanent magnet synchronous motor provided by this utility model; Figure 2 for Figure 1 A partially enlarged schematic diagram of the permanent magnet synchronous motor shown. Figure 3 This is a structural schematic diagram of the opening end of the casing of this utility model; Figure 4 This is a schematic diagram of the installation structure of the housing and the upper cover of this utility model; Figure 5 This is a schematic diagram of the installation structure of the housing and lower end cover of this utility model.

[0019] Figure descriptions: 1. Housing; 11. Open end; 12. Limiting groove; 13. Annular step; 2. Stator assembly; 3. Rotor assembly; 4. Shaft; 5. Sealing sleeve structure; 51. Inner sleeve sealing part; 52. Outer sleeve sealing part; 53. Intermediate sealing plate; 54. Sealing protrusion; 55. Annular buffer groove; 6. Snap ring structure; 7. Upper end cover; 71. First inner flange; 72. First sealing ring; 8. Lower end cover; 81. Second inner flange; 82. Second sealing ring; 91. First bearing; 92. Second bearing. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] Example The following is a detailed description of this embodiment with reference to the accompanying drawings: This embodiment provides, as follows: Figure 1-5 The high-sealing permanent magnet synchronous motor shown includes a housing 1, a stator assembly 2 and a rotor assembly 3 disposed within the housing 1, and a rotating shaft 4 coaxially connected to the rotor assembly 3. One end of the housing 1 is provided with an open end 11 through which the rotating shaft 4 passes, and the other end is a closed end. A sealing sleeve structure 5 is provided between the open end 11 and the rotating shaft 4. The sealing sleeve structure 5 includes an outer sealing part 52 embedded in a limiting groove 12 formed inside the open end 11, and an inner sealing part 51 extending axially along the rotating shaft 4 and sleeved on the rotating shaft 4. The inner sealing part 51 is tightly held to the rotating shaft 4 by a retaining ring structure 6 to form a dynamic sealing connection. The outer sealing part 52 contacts the inner wall of the open end 11 to form a circumferential sealing connection.

[0024] In the above embodiment, based on the overall design of the housing 1 with one end open and sealed and the other end closed, a sealing sleeve structure 5 is provided between the open end 11 of the housing 1 and the rotating shaft 4. The sealing sleeve structure 5 is divided into an inner sealing part 51 and an outer sealing part 52. The outer sealing part 52 is embedded in the limiting groove 12 formed inside the open end 11. The limiting groove 12 ensures that the sealing sleeve will not move axially or radially when the motor vibrates during operation. The outer sealing part 52 contacts the inner wall of the open end 11 to form a circumferential sealing connection, thereby achieving static sealing between the sealing sleeve structure 5 and the open end 11. The inner sealing part 51 is held tightly to the rotating shaft 4 by a retaining ring structure 6 to form a dynamic sealing connection. Structure 6 provides a continuous and uniform radial pressure to the sealing sleeve, ensuring that the inner sleeve sealing part 51 is always in close contact with the surface of the rotating shaft 4. This design allows the rotating shaft 4 to remain tightly sealed during rotation, effectively preventing oil and impurities from entering through the gap between the rotating shaft 4 and the housing 1. The permanent magnet synchronous motor with this structure design forms a dynamic and static dual sealing mechanism between the opening end 11 and the rotating shaft 4 through the above-mentioned sealing sleeve structure 5, ultimately forming an overall sealing pattern of "only the end of the rotating shaft is sealed, and the rest are closed". This spatially cuts off all external channels for impurities to enter the motor, significantly improving the overall sealing performance of the motor, improving product performance and lifespan, and is suitable for high vibration and high speed conditions.

[0025] The following is combined Figure 1-3 The specific design of the sealing sleeve structure is explained in detail: The sealing sleeve structure 5 includes a central sealing plate connecting the inner sleeve sealing part 51 and the outer sleeve sealing part 52. The inner sleeve sealing part 51, the central sealing plate, and the outer sleeve sealing part 52 enclose an annular buffer groove 55, with the inner sleeve sealing part 51 and the outer sleeve sealing part 52 on either side of the annular buffer groove 55. This structural arrangement directly connects the inner sleeve sealing part 51 and the outer sleeve sealing part 52 via the central sealing plate, forming an integral sealing sleeve assembly. This significantly improves structural rigidity. This connection prevents relative displacement of the inner and outer sleeves due to vibration. The annular buffer groove 55, acting as an annular space between the inner and outer sleeves, buffers vibration impacts between the inner sleeve sealing part 51 and the outer sleeve sealing part 52, reducing fatigue damage to the seals and extending the service life of the overall sealing sleeve.

[0026] In a further preferred embodiment, the retaining ring structure 6 is an annular elastic retaining ring sleeved on the outside of the inner sleeve sealing part 51 and housed in the annular buffer groove 55. The annular elastic retaining ring applies a radial compressive force to the inner sleeve sealing part 51, tightly gripping the rotating shaft 4. The outer peripheral wall of the inner sleeve sealing part 51 is provided with a retaining ring groove for positioning and installing the retaining ring structure 6. The retaining ring groove provides a shape-fitting fitting position for the annular elastic retaining ring. The elastic retaining ring is directly embedded into the retaining ring groove on the outer peripheral wall of the inner sleeve sealing part. The positioning fit formed by the retaining ring groove and the elastic retaining ring can completely restrict the displacement of the elastic retaining ring, ensuring the stability and reliability of the installation position of the elastic retaining ring. By designing an annular elastic retaining ring to apply a uniform and continuous radial clamping force to the inner sleeve sealing part 51, the radial clamping force is evenly distributed along the circumference, so that the inner sleeve sealing part 51 can fit tightly against the surface of the rotating shaft 4 in all directions, avoiding gaps caused by insufficient local fit, completely blocking the intrusion path of impurities along the surface of the rotating shaft 4, and can adaptively compensate for the dimensional fluctuations of the rotating shaft 4 caused by temperature changes or slight eccentricity. That is, when the elastic retaining ring is affected by the slight fluctuations of the rotating shaft 4, it adaptively adjusts through elastic deformation to maintain a stable radial extrusion force, avoids the attenuation of clamping force, thereby maintaining the stability of sealing pressure and significantly extending the sealing life of the sealing sleeve structure 5.

[0027] like Figure 2 As shown, at least one sealing protrusion 54 is provided on the inner peripheral wall of the inner sleeve sealing part 51, which is in close contact with the rotating shaft 4. The sealing protrusion 54 is V-shaped. The advantage of this design is that the tip of the sealing protrusion 54 can make extremely close contact with the surface of the rotating shaft 4, which can generate higher local pressure under the same clamping force of the retaining ring, ensuring the tightness of the dynamic seal, and helping to reduce frictional resistance and wear, thus balancing sealing performance and service life. In addition, multiple such sealing protrusions 54 can be arranged axially on the inner sleeve sealing part 51, thereby forming multiple continuous sealing barriers between the rotating shaft 4 and the inner sleeve sealing part 51, which significantly improves the reliability of the dynamic seal and realizes the upgrade from single-point sealing to multiple sealing.

[0028] In this embodiment, combined with Figure 1 and Figure 4-5As shown, the housing 1 includes an upper end cover 7 and a lower end cover 8 installed at both ends. The upper end cover 7 and the lower end cover 8 are respectively fixed to both ends of the housing 1 by multiple sets of bolts. An open end 11 is provided in the middle of the upper end cover 7. The other end of the housing 1 is sealed by the lower end cover 8 to form the closed end. A first bearing 91 that cooperates with the rotating shaft 4 is embedded in the open end 11. The open end 11 includes an annular step 13 disposed on its inner wall and opposite to the first bearing 91, and a limiting groove 12 formed between the annular step 13 and the first bearing 91. The outer sealing sleeve is fitted into the limiting groove 12 and in close contact with the annular step 13. The annular step 13 provides a clear axial positioning stop for the sealing sleeve, preventing it from moving into the housing 1 during installation or operation, and through The inner wall of the limiting groove 12 forms radial constraint and support for the outer sealing part 52, ensuring that it maintains uniform and tight circumferential contact with the inner wall of the housing, thereby forming a reliable static seal. This design avoids deformation or displacement of the sealing sleeve due to improper installation or pressure fluctuations. Further preferably, the inner side of the lower end cover 8 is formed with a groove structure opposite to the opening end. The groove structure is embedded with a second bearing 92 that cooperates with the rotating shaft 4. The first bearing 91 and the second bearing 92 are coaxially opposite each other. The first bearing 91 and the second bearing 92 provide two precise support points for the rotating shaft 4 at both ends of the motor, ensuring that the center line of the rotor assembly 3 and the rotating shaft 4 is consistent with the center line of the stator assembly 2, thereby ensuring the symmetry of the magnetic field distribution and achieving a high-efficiency, low-vibration and low-noise operating state.

[0029] The following is combined Figure 4-5 The sealing method between the upper and lower end covers and the housing is explained below: The upper end cover 7 has a first inner flange 71 extending into the housing 1. A first sealing ring 72 is provided at the junction of the first inner flange 71 and the inner wall of one end of the housing 1. A sealing groove for accommodating the first sealing ring 72 is provided on the outer peripheral wall of the first inner flange 71. The first inner flange 71 is pressed into one end of the housing 1 to form a static seal by compressing the first sealing ring 72. With this structure, the upper end cover 7 forms an annular sidewall contact with the housing 1 through the first inner flange 71, increasing the sealing joint area. A sealing groove is provided on the upper part and a first sealing ring 72 is installed. When the upper end cover 7 is fixed to the housing 1 by bolts, it will drive the first inner flange 71 to be pressed into one end of the housing 1. This causes the first sealing ring 72 to be radially compressed by the first inner flange 71 and the inner wall of the housing 1, generating a uniform rebound force. This tightly fills all the gaps between the first inner flange 71 and the inner wall of the housing 1. The rebound pressure of this sealing ring can also maintain the tight fit of the sealing surface, avoid the sealing pressure from decaying over time, ensure the long-term reliability of the static seal, and compensate for processing errors to achieve a reliable and uniform circumferential static seal. Correspondingly, the lower end cover 8 has a second inner flange 81 extending into the housing 1. A second sealing ring 82 is provided at the junction of the second inner flange 81 and the inner wall of the other end of the housing 1. A sealing groove for accommodating the second sealing ring 82 is provided on the outer peripheral wall of the second inner flange 81. The second inner flange 81 is pressed into the other end of the housing and forms a static seal by compressing the second sealing ring 82. This installation design causes the second sealing ring 82 to generate a uniform rebound force under compression, thereby tightly filling all gaps between the second inner flange 81 and the inner wall of the housing 1, achieving a reliable and uniform circumferential static seal. In summary, in this embodiment, the upper end cover 7 and the lower end cover 8 are installed in the same way with both ends of the housing to achieve a sealed installation, which can effectively prevent external oil, dust and other impurities from entering the motor from the joint gap between the housing and the upper and lower end covers, further improving the sealing performance of the permanent magnet synchronous motor.

[0030] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A high-sealing permanent magnet synchronous motor, comprising a housing (1), a stator assembly (2) and a rotor assembly (3) disposed within the housing (1), and a rotating shaft (4) coaxially connected to the rotor assembly (3), wherein one end of the housing (1) is provided with an open end (11) through which the rotating shaft (4) passes, and the other end is a closed end, characterized in that: A sealing sleeve structure (5) is provided between the opening end (11) and the rotating shaft (4). The sealing sleeve structure (5) includes an outer sealing part (52) embedded in the limiting groove (12) formed inside the opening end (11) and an inner sealing part (51) extending axially along the rotating shaft (4) and sleeved on the rotating shaft (4). The inner sealing part (51) is held tightly to the rotating shaft (4) by a retaining ring structure (6) to form a dynamic sealing connection. The outer sealing part (52) contacts the inner wall of the opening end (11) to form a circumferential sealing connection.

2. The high-sealing permanent magnet synchronous motor according to claim 1, characterized in that: The sealing sleeve structure (5) includes a middle sealing piece connected between the inner sealing part (51) and the outer sealing part (52), and the inner sealing part (51), the middle sealing piece, and the outer sealing part (52) form an annular buffer groove (55), with the inner sealing part (51) and the outer sealing part (52) on both sides of the annular buffer groove (55).

3. The high-sealing permanent magnet synchronous motor according to claim 2, characterized in that: The retaining ring structure (6) is an annular elastic retaining ring sleeved on the outside of the inner sleeve sealing part (51) and housed in the annular buffer groove (55). The annular elastic retaining ring applies a radial extrusion force to the inner sleeve sealing part (51) to tightly hug the rotating shaft (4).

4. The high-sealing permanent magnet synchronous motor according to claim 3, characterized in that: The outer peripheral wall of the inner sleeve sealing part (51) is provided with a retaining groove for positioning and installing the retaining ring structure (6).

5. The high-sealing permanent magnet synchronous motor according to claim 3, characterized in that: The inner sleeve sealing part (51) has at least one sealing protrusion (54) that is in close contact with the rotating shaft (4) on its inner peripheral wall.

6. The high-sealing permanent magnet synchronous motor according to any one of claims 1-5, characterized in that: The housing (1) includes an upper end cover (7) and a lower end cover (8) installed at both ends. The upper end cover (7) and the lower end cover (8) are respectively fixed to both ends of the housing (1) by multiple sets of bolts. An opening end (11) is provided in the middle of the upper end cover (7), and the other end of the housing (1) is sealed by the lower end cover (8) to form a closed end.

7. The high-sealing permanent magnet synchronous motor according to claim 6, characterized in that: The opening end (11) is fitted with a first bearing (91) that cooperates with the rotating shaft (4). The opening end (11) includes an annular step (13) disposed on its inner wall and opposite to the first bearing (91), and a limiting groove (12) formed between the annular step (13) and the first bearing (91). The outer sealing part is fitted into the limiting groove (12) and is in contact with the annular step (13).

8. The high-sealing permanent magnet synchronous motor according to claim 7, characterized in that: The inner side of the lower end cover (8) is formed with a groove structure opposite to the opening end. A second bearing (92) that cooperates with the rotating shaft (4) is embedded in the groove structure. The first bearing (91) and the second bearing (92) are coaxially opposite to each other.

9. The high-sealing permanent magnet synchronous motor according to claim 7 or 8, characterized in that: The upper end cover (7) has a first inner flange (71) extending into the housing (1). A first sealing ring (72) is provided at the junction of the first inner flange (71) and the inner wall of one end of the housing (1). A sealing groove for accommodating the first sealing ring (72) is provided on the outer peripheral wall of the first inner flange (71). The first inner flange (71) is pressed into one end of the housing (1) to form a static seal by compressing the first sealing ring (72).

10. The high-sealing permanent magnet synchronous motor according to claim 7 or 8, characterized in that: The lower end cover (8) has a second inner flange (81) extending into the housing (1). A second sealing ring (82) is provided at the junction of the second inner flange (81) and the inner wall of the other end of the housing (1). A sealing groove for accommodating the second sealing ring (82) is provided on the outer peripheral wall of the second inner flange (81). The second inner flange (81) is pressed into the other end of the housing (1) and forms a static seal by compressing the second sealing ring (82).

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