Plastic magnetic rotor and permanent magnet synchronous motor using same

Abstract

The plastic magnetic rotor comprises a rotor shaft, a framework and a plastic magnetic layer, the framework comprises an interlayer and a core part, the interlayer divides the interior of the plastic magnetic layer into a left part and a right part, the core part is located in the center of the interlayer and wraps the rotor shaft, and the plastic magnetic layer is located in the middle of the interlayer. The interlayer is provided with at least one oil passing hole through which grease can pass; the permanent magnet synchronous motor comprises the plastic magnetic rotor, a casing, a coil and a gear box, claw pole plates of the casing and the gear box are provided with fixing parts, spherical bearings with shaft holes are embedded in the fixing parts, one end, connected with the casing, of the rotor shaft is inserted into the shaft holes of the spherical bearings, and one end, close to the gear box, of the rotor shaft penetrates through the spherical bearings and is connected with a driving gear. The spherical bearing can rotate in the fixing piece. The two ends of the rotor shaft are conveniently lubricated through the oil holes, the spherical bearings with spherical shapes are assembled with the two ends of the rotor shaft, the rotor is easy to assemble, the concentricity is automatically adjusted during operation, and the operation stability of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and more specifically to a plastic magnetic rotor and a permanent magnet synchronous motor using the plastic magnetic rotor. Background Art

[0002] Small permanent magnet motors are usually composed of a casing, a coil and rotor contained in the casing, a gearbox and other components. The rotor is located at the center of the coil, and the position of the coil in the casing needs to remain unchanged. The rotor can rotate relative to the coil. The rotor rotates to drive the output shaft of the gearbox to rotate, thereby realizing the operation of the motor.

[0003] The plastic magnetic rotor is a widely used rotor. It has a skeleton inside that supports the plastic magnetic layer outside. The skeleton divides the inside of the plastic magnetic rotor into two parts, left and right. The two parts are not connected. The two ends of the central axis of the plastic magnetic rotor can be rotatably set. In order to make the central axis rotate smoothly, bearings can be added. In order to extend the service life of the motor, paste-like lubricating grease will be applied to both ends of the central axis of the plastic magnetic rotor when assembling the motor. During use, lubricant cannot be added to the mounting end of the rotor shaft and the bottom of the casing. Lubricant can only be added to the end where the rotor shaft is connected to the gearbox. The newly added lubricant cannot reach the connection between the rotor shaft and the bottom of the casing. After long-term use, the lubricating grease is consumed. If it is not added in time, it will cause dry grinding of the rotor, which will cause damage to the motor and shorten the service life of the motor.

[0004] In addition, during the installation of the rotor, the concentricity requirement is high. Due to the swing of the rotor, if the concentricity of the rotor shaft is not good during assembly, the rotation stability is poor, which will also cause abnormal noise in the motor and accelerate the wear of the parts connected to the rotor shaft or indirectly transmitted, thereby shortening the service life of the motor. If the rotor is not assembled using bearings, the concentricity requirement is higher. After assembling the rotor shaft with traditional bearings, the requirement can be slightly reduced, but the problem is still not solved, and the service life of the motor can only be slightly extended. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a plastic magnetic rotor and a permanent magnet synchronous motor using the plastic magnetic rotor. Lubrication can be achieved at both ends of the rotor shaft by adding lubricating grease on one side, and spherical bearings with a spherical shape are assembled with both ends of the rotor shaft, which is easy to assemble the rotor and is also beneficial for autonomously adjusting the concentricity during operation, thereby improving the stability of motor operation and extending the service life of the motor.

[0006] According to one aspect of the utility model, a plastic magnetic rotor is provided, which includes a rotor shaft, a skeleton and a plastic magnetic layer, the skeleton is injection-molded and fixed on the rotor shaft, the plastic magnetic layer is injection-molded on the surface of the skeleton, the shape of the plastic magnetic layer is a cylindrical structure, the skeleton includes a partition and a core, the partition divides the interior of the plastic magnetic layer into two parts, the core is located at the center of the partition and covers the rotor shaft, both sides of the partition are provided with reinforcing ribs, the two ends of the reinforcing ribs are respectively connected to the core and the plastic magnetic layer, and the partition is provided with at least one oil hole for grease to pass through. Therefore, during the rotation of the rotor, the lubricating grease paste will be heated, and the lubricating grease paste will melt after heating. The melted lubricating grease enters the other side through the oil hole on the partition, along the surface of the rotor shaft until it reaches the connection with the bottom of the casing (such as a bearing), so that the lubricant is added at one end to achieve the effect of lubricating both ends of the rotor shaft, avoiding dry grinding at both ends of the rotor shaft, and extending the service life of the motor.

[0007] In some embodiments, the end surfaces of both sides of the plastic magnetic layer are recessed inward near the inner wall to form a step-like structure. Therefore, the structure can make the mounting components at both ends of the rotor shaft partially located at the recessed structure of the plastic magnetic layer, so that the distance between the two ends of the plastic magnetic rotor and the housing and the gear box is closer, thus reducing the length of the rotor shaft, which is conducive to improving the rotation stability of the plastic magnetic rotor.

[0008] In some embodiments, the two ends of the core have a first stopper and a second stopper protruding outward, respectively, and the first stopper and the second stopper do not protrude from the inwardly recessed end surface of the plastic magnetic layer. Thus, the first stopper and the second stopper increase the connection area between the rotor shaft and the frame, which can improve the reliability of the rotor shaft injection molding.

[0009] In some embodiments, the frame and the plastic magnetic layer are an integrally formed structure. Thus, the frame and the plastic magnetic layer are made of the same material, and after the rotor shaft is positioned, the frame and the plastic magnetic layer can be integrally injection molded.

[0010] According to another aspect of the utility model, a permanent magnet synchronous motor is provided, which includes the above-mentioned plastic magnetic rotor, as well as a casing, a coil, and a gear box. The gear box is provided with a claw pole plate with an upper claw pole, and the bottom of the casing is provided with a lower claw pole. The coil, the plastic magnetic rotor and the gear box are sequentially inserted into the casing, and one end of the rotor shaft of the plastic magnetic rotor can be rotatably connected to the casing, and the other end of the rotor shaft of the plastic magnetic rotor is meshed with the gear box through a driving gear. Therefore, the above-mentioned plastic magnetic rotor with an oil hole is applied to the permanent magnet synchronous motor, and lubricating grease can be added to the side close to the gear box. The lubricating grease paste generates heat as the motor runs, and the lubricating grease paste melts. The melted lubricating grease enters the other side of the plastic magnetic rotor through the oil hole on the interlayer, and reaches the connection between the rotor shaft and the casing along the rotor shaft, thereby avoiding dry grinding due to lack of lubricating oil at the connection between the rotor shaft and the casing, thereby extending the service life of the entire motor.

[0011] In some embodiments, a fixing piece is provided at the bottom center of the housing and the center of the claw pole plate, a spherical bearing is embedded in the fixing piece, the center of the spherical bearing has an axial hole for inserting the rotor shaft, one end of the rotor shaft connected to the housing is inserted into the axial hole of the spherical bearing, and one end of the rotor shaft close to the gear box passes through the spherical bearing to connect to the driving gear, and the surface where the fixing piece and the spherical bearing cooperate is an arc surface, which can allow the spherical bearing to rotate in the fixing piece. Therefore, when assembling the permanent magnet synchronous motor, the spherical bearing is first mounted on the rotor shaft on the side of the gear box, and the driving gear is fixed by riveting, and the other end of the rotor shaft is inserted into the shaft hole of the spherical bearing on the casing. When the rotor is assembled, it is beneficial to autonomously adjust the concentricity of the rotor shaft and the shaft hole of the spherical bearing, and the assembly is easy. During the rotation of the motor, when the spherical bearing assembled with the rotor shaft is connected with the fixing part, the contact surface of the fixing part with the spherical bearing is matched with the outer shape of the spherical bearing. After the spherical bearing is assembled, the spherical bearing is allowed to rotate freely in the fixing part. When the rotor rotates, the concentricity can be adjusted by borrowing, and the concentricity can be adjusted autonomously, which greatly improves the stability of the motor operation.

[0012] In some embodiments, the fixing member includes an outer end face and an inner end face, and the outer end faces and inner end faces of the two fixing members clamp the housing and the claw pole plate respectively, and the inner circle of the outer end face is connected to the inner circle of the inner end face to form an air vent. Thus, the fixing member can be formed by injection molding to clamp the outer end face and the inner end face of the housing and the claw pole plate, thereby improving the connection reliability between the fixing member and the housing or the claw pole plate.

[0013] In some embodiments, both the housing and the claw pole plate are provided with through holes, and fillers are injected into the through holes to connect the outer end face and the inner end face. Thus, when the fixing piece is injection molded, the injected fillers fill the through holes on the housing and the claw pole plate, so that the outer end face and the inner end face are connected, which can ensure that the fixing piece is firmly connected to the housing and the claw pole plate.

[0014] In some embodiments, a hollow boss portion is provided on the inner end surface, the spherical bearing is located in the boss portion, and an open groove is provided on the wall of the boss portion. Thus, the open groove is designed to facilitate the spherical bearing to be embedded in the fixing member.

[0015] In some embodiments, rubber elastic rings and gaskets are sleeved on the rotor shafts on both sides of the first limit portion and the second limit portion, and the gasket is located on the side close to the spherical bearing. Therefore, when the plastic magnetic rotor rotates, there will be swinging, and the rubber elastic ring can avoid the hard impact of the rotor at two tons, but the rubber elastic ring has large resistance. Adding a graphite gasket is beneficial to reducing the resistance between the spherical bearing, and the graphite gasket has good wear resistance and high temperature resistance, which is beneficial to extending the service life of the motor.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the plastic magnetic rotor and the rotor shaft provided by the utility model adopt an integrated injection molding structure, an oil hole is arranged in the plastic magnetic rotor, and the plastic magnetic rotor with the oil hole is applied to the permanent magnet synchronous motor, and the heat generated by the operation of the motor is used to melt the lubricating grease paste, so that the lubricating grease on the side close to the gear box enters the other side of the plastic magnetic rotor through the oil hole after melting, and the lubricating grease reaches the rotatable connection between the rotor shaft and the casing along the rotor shaft, which can achieve the effect of adding lubricating grease on one side and benefiting both sides, and avoid the dry grinding phenomenon caused by lack of lubricating oil at the connection between the rotor shaft and the casing; the spherical bearing with a spherical shape is assembled with the two ends of the rotor shaft, and when the plastic magnetic rotor is inserted into the casing, since the spherical bearing can rotate in the fixing part, it can be used as a position when the rotor shaft is inserted, so that the spherical bearing at the rotor shaft and the casing is easier to assemble, and during the operation of the motor, both ends of the rotor shaft are assembled with spherical bearings, which is conducive to self-adjustment of concentricity during operation, improves the stability of motor operation, and prolongs the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of an implementation method of a plastic magnetic rotor of the utility model;

[0018] Figure 2 It is a structural schematic diagram of an implementation mode of a permanent magnet synchronous motor of the utility model;

[0019] Figure 3 It is an exploded schematic diagram of an implementation manner of a permanent magnet synchronous motor of the utility model. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with specific implementation methods.

[0021] Example 1

[0022] A plastic magnetic rotor according to one embodiment of the utility model is used for a small permanent magnet synchronous motor. The plastic magnetic rotor rotates relative to a coil 3 of the permanent magnet synchronous motor. The rotation of the plastic magnetic rotor drives the output shaft of a gearbox 4 of the permanent magnet synchronous motor to rotate, thereby realizing motor operation.

[0023] like Figure 1As shown, the plastic magnetic rotor includes a rotor shaft 11, a skeleton 12 and a plastic magnetic layer 13. The rotor shaft 11 is made of metal, and the skeleton 12 and the plastic magnetic layer 13 are made of the same material, namely, plastic magnetic material. After the rotor shaft 11 is positioned, the skeleton 12 and the plastic magnetic layer 13 are integrally injection molded into an integral structure by using an injection molding process. The skeleton 12 is injection-molded and fixed on the rotor shaft 11, and the plastic magnetic layer 13 is injection-molded on the surface of the skeleton 12. The shape of the plastic magnetic layer 13 is a cylindrical structure. The skeleton 12 includes an interlayer 121 and a core 122. The interlayer 121 divides the interior of the plastic magnetic layer 13 into two left and right parts. The core 122 is located at the center of the interlayer 121 and covers the rotor shaft 11. Both sides of the interlayer 121 are provided with reinforcing ribs 123, and the two ends of the reinforcing ribs 123 are respectively connected to the core 122 and the plastic magnetic layer 13. At least one oil hole 124 is provided on the partition layer 121 for grease to pass through. Two symmetrical oil holes 124 may be provided. The oil holes 124 are through holes.

[0024] During the rotation of the rotor, the lubricating grease paste will be heated. Although in order to ensure the service life of the motor, the selection of lubricating grease paste is generally determined according to its use environment, such as high temperature resistant grease, ordinary grease, and low temperature resistant grease, the lubricating grease paste will melt after exceeding the temperature it can withstand. As the running time of the motor passes, the temperature changes throughout the year, and the lubricating grease paste will have some melting loss, and there is a possibility of loss, so lubricating grease paste can be appropriately added when necessary. In order to facilitate the operation, the motor is not completely disassembled, and the plastic magnetic rotor is not taken out. Lubricating grease is added to one end of the plastic magnetic rotor. The lubricating grease after a small amount of melting enters the other side through the oil hole 124 on the interlayer 121, along the surface of the rotor shaft 11 until it reaches the connection with the bottom of the housing 2 (such as the bearing). In this way, the lubricant is added at one end to achieve the effect of lubricating both ends of the rotor shaft 11, avoiding dry grinding at both ends of the rotor shaft 11, and extending the service life of the motor.

[0025] The end surfaces of both sides of the plastic magnetic layer 13 are concave inwards near the inner wall, and have inwardly concave end surfaces 131, forming a step-like structure. This structure can make the mounting parts at both ends of the rotor shaft 11 located at the inward structure of the plastic magnetic layer 13, so that the distance between the two ends of the plastic magnetic rotor and the housing 2 and the gear box 4 is closer, so that the length of the rotor shaft 11 can be reduced, which is conducive to improving the stability of the rotation of the plastic magnetic rotor.

[0026] like Figure 2 As shown, the two ends of the core 122 of the skeleton 12 respectively have a first limiting portion 1221 and a second limiting portion 1222 protruding outward, and the first limiting portion 1221 and the second limiting portion 1222 do not protrude from the inwardly recessed end surface 131 of the plastic magnetic layer 13. The first limiting portion 1221 and the second limiting portion 1222 increase the connection area between the rotor shaft 11 and the skeleton 12, which can improve the reliability of the injection molding of the rotor shaft 11.

[0027] Example 2

[0028] like Figures 2 to 3 As shown, a permanent magnet synchronous motor according to an embodiment of the present invention comprises the above-mentioned plastic magnetic rotor, as well as a casing 2, a coil 3, and a gear box 4. The gear box 4 has a claw pole plate 40 with an upper claw pole 41. The bottom of the casing 2 is bent inward to form a lower claw pole 21. The coil 3, the plastic magnetic rotor and the gear box 4 are sequentially inserted into the casing 2. One end of the rotor shaft 11 of the plastic magnetic rotor is rotatably connected to the casing 2, and the other end of the rotor shaft 11 of the plastic magnetic rotor is meshed with the gear box 4 through a driving gear 5. The above-mentioned plastic magnetic rotor with the oil hole 124 is applied to the permanent magnet synchronous motor, and lubricating grease can be added on the side close to the gear box 4. For example, after removing the gear box 4, lubricating grease paste is applied to the bearing of the rotor shaft 11 close to the gear box 4. As the motor runs and generates heat, a small amount of lubricating grease paste melts. The melted lubricating grease enters the other side of the plastic magnetic rotor through the oil hole 124 on the interlayer 121, and reaches the connection between the rotor shaft 11 and the casing 2 along the rotor shaft 11, thereby avoiding dry grinding due to lack of lubricating oil at the connection between the rotor shaft 11 and the casing 2, thereby extending the service life of the entire motor.

[0029] A fixing part 6 is installed at the bottom center of the housing 2 and the center of the claw pole plate 40. A spherical bearing 7 is embedded in the fixing part 6. The spherical bearing 7 has a spherical structure. The center of the spherical bearing 7 has an axial hole 71 for inserting the rotor shaft 11. The end of the rotor shaft 11 connected to the housing 2 is inserted into the axial hole 71 of the spherical bearing 7. The end of the rotor shaft 11 near the gear box 4 passes through the spherical bearing 7 and is connected to the driving gear 5. The surface of the fixing part 6 and the spherical bearing 7 is an arc surface 72, which can allow the spherical bearing 7 to rotate in the fixing part 6.

[0030] When assembling the permanent magnet synchronous motor, the spherical bearing 7 is first mounted on the rotor shaft 11 on the side of the gear box 4, and the driving gear 5 is fixed by riveting; after the coil 3 is placed on the housing 2, the other end of the rotor shaft 11 is inserted into the shaft hole 71 of the spherical bearing 7 on the housing 2. When the rotor is assembled, it is beneficial to adjust the concentricity of the rotor shaft 11 and the shaft hole 71 of the spherical bearing 7 independently, and it is easy to assemble; then the gear box 4 is installed, and the end of the rotor shaft 11 with the driving gear 5 riveted is inserted into the fixing piece 6 on the claw pole plate 40, and the driving gear 5 passes through the fixing piece 6, so that the spherical bearing 7 is assembled in the fixing piece 6, and the driving gear 5 on the rotor shaft 11 is meshed with the gear box 4 for transmission. During the rotation of the motor, when the spherical bearing 7 assembled with the rotor shaft 11 is connected to the fixing part 6, the contact surface of the fixing part 6 with the spherical bearing 7 matches the outer shape of the spherical bearing 7. After the spherical bearing 7 is assembled, the spherical bearing 7 is allowed to rotate freely in the fixing part 6. When the rotor rotates, the concentricity can be adjusted autonomously, which greatly improves the stability of the motor operation.

[0031] The fixing member 6 includes an outer end face 61 and an inner end face 62. The outer end faces 61 and the inner end faces 62 of the two fixing members 6 clamp the housing 2 and the claw pole plate 40 respectively. The inner circle of the outer end face 61 is connected to the inner circle of the inner end face 62, and a vent hole 63 is formed in the center. A plurality of evenly distributed through holes 8 are provided on the housing 2 and the claw pole plate 40. The fixing member 6 is formed by injection molding to form the outer end face 61 and the inner end face 62 for clamping the housing 2 and the claw pole plate 40. When the fixing member 6 is injection molded, the injection molded filler fills the through holes 8 on the housing 2 and the claw pole plate 40, so that the outer end face 61 and the inner end face 62 are connected, thereby improving the connection reliability between the fixing member 6 and the housing 2 or the claw pole plate 40.

[0032] A hollow boss portion 64 extends from the inner end surface 62, and the spherical bearing 7 is located in the boss portion 64. An opening groove 65 is provided on the wall of the boss portion 64 to facilitate the spherical bearing 7 to be embedded in the fixing member 6. Two opening grooves 65 can be provided, symmetrically with the center of the fixing member 6.

[0033] In practical applications, rubber elastic rings 91 and gaskets 92 are sleeved on the rotor shaft 11 on both sides of the first limiting portion 1221 and the second limiting portion 1222, and the gasket 92 is located on the side close to the spherical bearing 7. Because the plastic magnetic rotor will swing when rotating, the rubber elastic ring 91 can avoid the hard impact of the rotor at two tons, but the rubber elastic ring 91 has a large resistance, and adding the graphite gasket 92 is beneficial to reducing the resistance between the spherical bearing 7, and the graphite gasket 92 has good wear resistance and high temperature resistance, which is beneficial to prolonging the service life of the motor.

[0034] The plastic magnetic rotor and the rotor shaft 11 provided by the utility model adopt an integrated injection molding structure, and an oil hole 124 is arranged in the plastic magnetic rotor. The plastic magnetic rotor with the oil hole 124 is applied to a permanent magnet synchronous motor, and the heat generated by the operation of the motor is used to melt a small amount of lubricating grease paste, so that the lubricating grease on one side passes through the oil hole 124 after melting and enters the other side of the plastic magnetic rotor, and the lubricating grease reaches the rotatable connection between the rotor shaft 11 and the casing 2 along the rotor shaft 11, which can achieve the effect of adding lubricating grease on one side and benefiting both sides, and avoid the dry grinding phenomenon caused by lack of lubricating oil at the connection between the rotor shaft 11 and the casing 2. The spherical bearing 7 with a spherical shape is assembled with both ends of the rotor shaft 11. When the plastic magnetic rotor is inserted into the housing 2, the spherical bearing 7 can rotate in the fixing member 6, so that the rotor shaft 11 can be inserted in a position, making it easier to assemble the rotor shaft 11 with the spherical bearing 7 at the housing 2. During the operation of the motor, both ends of the rotor shaft 11 are assembled with the spherical bearing 7, which is conducive to the self-adjustment of the concentricity during operation, improving the stability of the motor operation, and extending the service life of the motor.

[0035] The above are only some embodiments of the present invention. It should be pointed out that for ordinary technicians in this field, other modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A plastic magnetic rotor, comprising a rotor shaft (11), a frame (12) and a plastic magnetic layer (13), wherein the frame (12) is fixed on the rotor shaft (11) by injection molding, and the plastic magnetic layer (13) is injection molded on the surface of the frame (12), and the plastic magnetic layer (13) has a cylindrical structure, characterized in that: The skeleton (12) comprises a partition (121) and a core (122); the partition (121) partitions the interior of the plastic magnetic layer (13) into two left and right parts; the core (122) is located at the center of the partition (121) and covers the rotor shaft (11); reinforcing ribs (123) are provided on both sides of the partition (121); two ends of the reinforcing ribs (123) are respectively connected to the core (122) and the plastic magnetic layer (13); and the partition (121) is provided with at least one oil hole (124) for grease to pass through.

2. The plastic magnetic rotor according to claim 1, characterized in that: The end surfaces on both sides of the plastic magnetic layer (13) are concave inwards near the inner wall to form a step-like structure.

3. The plastic magnetic rotor according to claim 2, characterized in that: The two ends of the core (122) respectively have a first limiting portion (1221) and a second limiting portion (1222) protruding outwards, and the first limiting portion (1221) and the second limiting portion (1222) do not protrude from the inwardly recessed end surface (131) of the plastic magnetic layer (13).

4. The plastic magnetic rotor according to claim 3, characterized in that: The skeleton (12) and the plastic magnetic layer (13) are an integrally formed structure.

5. A permanent magnet synchronous motor, comprising a housing (2), a coil (3), and a gear box (4), characterized in that: It also includes a plastic magnetic rotor as claimed in any one of claims 1 to 4, the gear box (4) is provided with a claw pole plate (40) having an upper claw pole (41), the bottom of the housing (2) is provided with a lower claw pole (21), the coil (3), the plastic magnetic rotor and the gear box (4) are sequentially inserted into the housing (2), one end of the rotor shaft (11) of the plastic magnetic rotor is rotatably connected to the housing (2), and the other end of the rotor shaft (11) of the plastic magnetic rotor is meshed with the gear box (4) through a driving gear (5).

6. The permanent magnet synchronous motor according to claim 5, characterized in that: A fixing part (6) is provided at the center of the bottom of the housing (2) and the center of the claw pole plate (40). A spherical bearing (7) is embedded in each of the fixing parts (6). The center of the spherical bearing (7) has an axial hole (71) for inserting a rotor shaft (11). One end of the rotor shaft (11) connected to the housing (2) is inserted into the axial hole (71) of the spherical bearing (7). One end of the rotor shaft (11) close to the gear box (4) passes through the spherical bearing (7) and is connected to the driving gear (5). The surface of the fixing part (6) and the spherical bearing (7) that match is an arc surface (72) that allows the spherical bearing (7) to rotate in the fixing part (6).

7. The permanent magnet synchronous motor according to claim 6, characterized in that: The fixing member (6) comprises an outer end surface (61) and an inner end surface (62); the outer end surfaces (61) and the inner end surfaces (62) of the two fixing members (6) clamp the housing (2) and the claw pole plate (40) respectively; the inner circle of the outer end surface (61) is connected to the inner circle of the inner end surface (62) to form an air vent (63).

8. The permanent magnet synchronous motor according to claim 7, characterized in that: The housing (2) and the claw pole plate (40) are both provided with a through hole (8), and a filler is injection-molded in the through hole (8) to connect the outer end surface and the inner end surface.

9. The permanent magnet synchronous motor according to claim 8, characterized in that: A hollow boss portion (64) is provided on the inner end surface (62), the spherical bearing (7) is located in the boss portion (64), and an open groove (65) is provided on the wall of the boss portion (64).

10. The permanent magnet synchronous motor according to any one of claims 5 to 9, characterized in that: A rubber elastic ring (91) and a gasket (92) are sleeved on the rotor shaft (11) on both sides of the first limiting portion (1221) and the second limiting portion (1222), and the gasket (92) is located on the side close to the spherical bearing (7).

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