Compressor and method of assembling the same

Abstract

The application discloses a compressor, comprising: a housing; a first scroll member and a second scroll member located in the housing, the first scroll member having a first end plate and a first scroll wrap extending from the first end plate towards the second scroll member, the second scroll member having a second end plate and a second scroll wrap extending from the second end plate towards the first scroll member, the second scroll wrap being intermeshed with the first scroll wrap to define compression chambers therebetween; a motor comprising a stator and a rotor and located on a side of the second scroll member away from the first scroll member for driving the second scroll member to rotate by driving the first scroll member to rotate; a drive mechanism comprising a receiving hub and a flange extending radially from a first end of the receiving hub and supporting the second end plate; wherein a second end of the receiving hub is fixed to the rotor to position the rotor to be spaced apart from the stator with a certain gap.

Description

Technical Field

[0001] The present invention relates to a compressor and a method for assembling the compressor. Background Technology

[0002] In existing scroll compressors, the motor typically includes a stator and a rotor. When the scroll compressor is working, the rotor rotates at high speed relative to the stator. Therefore, maintaining an ideal clearance between the rotor and the stator is of great importance for ensuring the safe operation of the compressor and maintaining its performance. Summary of the Invention

[0003] The embodiments of the present invention are intended to solve at least one aspect of the above problems.

[0004] According to one aspect of the present invention, a compressor is provided, comprising: a housing; a first scroll member and a second scroll member located within the housing, the first scroll member having a first end plate and a first scroll extending from the first end plate toward the second scroll member, the second scroll member having a second end plate and a second scroll extending from the second end plate toward the first scroll member, the second scroll member engaging with the first scroll member to define a compression chamber therebetween; a motor including a stator and a rotor, located on the side of the second scroll member away from the first scroll member, for driving the second scroll member to rotate by driving the first scroll member to rotate via the rotor; a drive mechanism including a receiving hub and a flange extending radially from a first end of the receiving hub and supporting the second end plate; wherein a second end of the receiving hub is fixed to the rotor to position the rotor at a gap spaced from the stator.

[0005] According to one aspect of the invention, the compressor further includes: a retainer for securing the rotor thereon; wherein a second end of the receiving hub is secured to the retainer radially inward of the rotor to position the rotor spaced apart from the stator.

[0006] According to one aspect of the invention, the retainer has a connecting hub and a cylindrical fixing portion, such that the rotor is fixed to the fixing portion on the outside of the connecting hub, and a second end of the receiving hub is threaded to the connecting hub on the inside of the connecting hub.

[0007] According to one aspect of the invention, the compressor further includes: a rolling bearing mounted inside the connecting hub of the retainer and abutting against the upper side of the second end of the receiving hub.

[0008] According to one aspect of the invention, the compressor further includes: a bracket fixed to the housing and abutting against the underside of the rolling bearing for supporting the retainer; and a shaft fixed to the bracket and extending from the bracket into a receiving hub, the shaft being provided with a shoulder abutting against the upper side of the rolling bearing to further position the rotor spaced apart from the stator.

[0009] According to one aspect of the invention, the bracket is provided with: a fixed hub, the bottom end of which extends into and is threadedly connected to the fixed hub; a cylindrical receiving portion for receiving a motor and a retainer; and a stepped portion connected between the receiving portion and the fixed hub for receiving a rolling bearing, such that the lower side of the rolling bearing abuts against the top of the fixed hub.

[0010] According to one aspect of the invention, the top end of the shaft is located in a receiving hub and is provided with a receiving hole, and the second end plate is provided with a mounting hub extending in a direction away from the first scroll member, the mounting hub being received in the receiving hole.

[0011] According to one aspect of the invention, the compressor further includes a pump having a top end of a mounting hub operably connected in a receiving hole to a second end plate and a bottom end extending into an oil sump located at the bottom of the housing, wherein a shaft is provided with a feed passage extending from its bottom end to its top end, and the pump is rotatably disposed in the feed passage to feed oil along the gap between the pump and the feed passage.

[0012] According to one aspect of the invention, the compressor further includes a first cover fixed to a bracket to cover the motor, located between the stator and the flange and received by a hub extending through it, wherein the stator is fixed to the first cover.

[0013] According to one aspect of the invention, the compressor further includes a second cover, the top of which covers and is fixed to the first end plate, and the sidewalls of the second cover are fixed to the flange.

[0014] According to one aspect of the invention, the rotor is located on the side of the stator opposite to the first cover.

[0015] According to one aspect of the invention, the central axis of the receiving hole of the shaft is collinear with the rotation axis of the second scroll member, the central axis of the top end of the shaft is collinear with the rotation axis of the first scroll member, and the central axis of the receiving hole is offset from the central axis of the top end of the shaft, such that the rotation axis of the second scroll member is offset from the rotation axis of the first scroll member.

[0016] According to one aspect of the invention, the gap is in the range of 0.1 mm to 3 mm.

[0017] According to another aspect of the present invention, a method for assembling a compressor is provided. The compressor includes: a housing, a bracket having a fixed hub, a motor having a stator and a rotor, a retainer having a connecting hub, a rolling bearing, and a drive mechanism having a receiving hub. The method includes: fixing the bracket in the housing; mounting the rolling bearing inside the connecting hub of the retainer; rotatably mounting the retainer, on which the rotor is mounted, onto the bracket and fixing the stator onto the bracket, wherein the stator and rotor are attracted together by magnetic attraction; and mounting the drive mechanism onto the retainer by threading the receiving hub of the drive mechanism onto the connecting hub of the retainer, such that one end of the receiving hub pushes against the upper side of the rolling bearing in a direction away from the stator, thereby moving the retainer and the rotor together in a direction away from the stator, thereby positioning the rotor spaced apart from the stator.

[0018] According to another aspect of the invention, the compressor further includes a shaft with a shoulder, and the method further includes: mounting the shaft to a bracket, wherein by fixing the bottom end of the shaft to a fixed hub of the bracket, the shoulder of the shaft is pushed against the upper side of the rolling bearing in a direction away from the stator until the lower side of the rolling bearing abuts against the top of the fixed hub of the bracket, thereby further maintaining the clearance between the rotor and the stator.

[0019] According to another aspect of the invention, the compressor further includes a first cover, wherein the step of fixing the stator to the bracket includes fixing the stator to the first cover and then fixing the first cover to the bracket. Attached Figure Description

[0020] The accompanying drawings, which are incorporated herein and form a part of this specification, illustrate this disclosure and, together with the description, further serve to explain the principles of this disclosure and enable those skilled in the art to make and use the embodiments described herein.

[0021] Figure 1 This is a perspective view of a compressor according to an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A cross-sectional view of the compressor is shown;

[0023] Figure 3 It is shown Figure 2 A cross-sectional view of the second scroll component, drive mechanism, motor housing, motor, bracket, shaft, rolling bearing, retainer, and pump assembled together;

[0024] Figure 4 It is shown Figure 2 A cross-sectional view of the drive mechanism, motor housing, motor, rolling bearing, retainer, and bracket assembled together;

[0025] Figure 5It is shown Figure 2 A cross-sectional view of a single axis within the structure;

[0026] Figure 6 It is shown Figure 2 A cross-sectional view of the motor housing, stator, and bracket assembled together; and

[0027] Figure 7 It is shown Figure 2 A cross-sectional view of the drive mechanism, rolling bearings, and retainer assembled together.

[0028] The features of this disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, wherein similar reference numerals always identify corresponding elements. In the drawings, similar reference numerals generally denote identical, functionally similar, and / or structurally similar elements. Unless otherwise stated, the drawings provided throughout this disclosure should not be construed as being drawn to scale. Detailed Implementation

[0029] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. In this specification, the same or similar reference numerals indicate the same or similar parts. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation thereof.

[0030] Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a thorough understanding of the embodiments disclosed herein. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and apparatuses are illustrated to simplify the figures.

[0031] In scroll compressors, radial flux motors are used, and a fixing device is employed to ensure the clearance between the rotor and stator of the radial flux motor. However, this often results in a large scroll compressor size, especially for compressors with high cooling / heating demands. As the cooling and heating capacity of compressors continues to increase, the motor occupies a large proportion of the overall compressor structure, making it impossible to achieve the goal of a compact and lightweight design. For existing variable frequency compressors, although variable frequency technology can increase cooling capacity, existing variable frequency motors still widely use radial flux motors, and the shortcomings of the current compressor structure still exist.

[0032] Axial flux motors effectively overcome the limitations of internal space in compressors, enabling compact structures. However, when designing compressors using axial flux motors, the magnetic force between the stator and rotor is relatively large, making it difficult to maintain the ideal clearance between the rotor and stator. This makes axial flux motors unsuitable for use in existing scroll compressors.

[0033] Figure 1 A perspective view of a compressor 1000 according to an embodiment of the present invention is shown. The compressor 1000 includes: a housing 100, a first scroll member 10 and a second scroll member 20 located within the housing 100, a motor 30, a retainer 33, a rolling bearing 34, a pump 40, a motor cover 50, a bracket 60, a drive mechanism 70, a scroll cover 80, and a shaft 90.

[0034] Figure 2 It shows Figure 1 The cross-sectional view of compressor 1000 shows its internal structure. Further reference will follow below. Figure 2 The overall structure and function of compressor 1000 are described in detail.

[0035] The first scroll member 10 has a first end plate 11 and a first scroll 12 extending from the first end plate 11 toward the second scroll member 20. The second scroll member 20 has a second end plate 21 and a second scroll 22 extending from the second end plate 21 toward the first scroll member 10. The second scroll 22 engages with the first scroll 12 to define a compression chamber 110 between them to compress refrigerant gas entering the compressor 1000 from the inlet 101 of the housing 100.

[0036] See Figure 2 In an embodiment of this application, the motor 30 is configured as an axial flux motor and is located on the side of the second scroll member 20 away from the first scroll member 10. The motor 30 includes a stator 31 and a rotor 32, wherein the rotor 32 is located on the side of the stator 31 away from the second scroll member 20 and spaced apart from the stator 31. The gap between the rotor 32 and the stator 31 needs to be maintained, for example, between 0.1 mm and 3 mm or between 0.5 mm and 1.5 mm, to ensure that the motor 30 can operate normally. The stator 31 is bolted to a motor housing 50. The motor housing 50 is bolted to a bracket 60 to cover the motor 30, forming a space together with the bracket 60 for accommodating the motor 30. The rotor 32 is located on the side of the stator 31 opposite to the motor housing 50. The rotor 32 is fixed to a retainer 33 (hereinafter referred to as...). Figure 3 , 4 As described in detail in section 7 (which describes the structure of the retainer 33 in detail), the retainer 33 is rotatably supported on a bracket 60, which is fixed to the housing 100 by an interference fit. The retainer 33 is threaded to a second end 712 of a cylindrical receiving hub 71 of the drive mechanism 70, which extends into the bracket 60. The second end 712 of the receiving hub 71 is fixed to the retainer 33 radially inward of the rotor 32 to position the rotor 32 spaced apart from the stator 31, thereby maintaining an ideal clearance between the rotor 32 and the stator 31.

[0037] In another embodiment of the invention, the rotor 32 and the retainer 33 can be integrally formed as a component serving as the rotor, so that the second end 712 of the receiving hub 71 can be directly fixed to the component serving as the rotor. This simplifies the structure of the compressor 1000.

[0038] A flange 72 extending radially from the first end 711 of the receiving hub 71 supports the second end plate 21. Its top 81 covers and is fixed to the first end plate 11, and the vortex cover 80 is fixed to the flange 72 radially outward from the second end plate 21 via its sidewalls 82. A motor cover 50 is located between the stator 31 and the flange 72 and is extended through the receiving hub 71.

[0039] With this configuration, the rotor 32 drives the first scroll member 10 to rotate via the retainer 33, the receiving hub 71, the flange 72, and the scroll cover 80, thereby driving the second scroll member 20 to rotate, so that the first scroll member 10 and the second scroll member 20 rotate together to compress the refrigerant gas.

[0040] See also Figure 2 The shaft 90 is fixed to the fixed hub 67 of the bracket 60 located in the oil sump 120 at the bottom of the housing 100 and extends from the fixed hub 67 of the bracket 60 into the receiving hub 71, such that the end face of the top end 91 of the shaft 90 located in the receiving hub 71 is approximately flush with the upper surface of the supporting second end plate 21 of the flange 72, and the bottom end 92 of the shaft 90 fixed to the fixed hub 67 of the bracket 60 is located in the oil sump 120. The shaft 90 is provided with a feed channel 93 extending from the bottom end 92 to the top end 91. The top end 91 of the shaft 90 is provided with a receiving hole 95 communicating with the feed channel 93. The mounting hub 23 of the second end plate 21, extending in a direction away from the first scroll member 10, is received in the receiving hole 95. A cylindrical threaded pump 40 is rotatably disposed in the feed channel 93 and extends along the feed channel 93 into the receiving hole 95, such that the top end 41 of the pump 40 can be operably connected to the mounting hub 23 of the second scroll member 20 in the receiving hole 95. The bottom end 42 of the pump 40 extends into the oil sump 120 located at the bottom of the housing 100.

[0041] The central axis of the receiving hole 95 is collinear with the rotation axis of the second scroll member 20, and the central axis of the top end 91 of the shaft 90 is collinear with the rotation axis of the first scroll member 10. The central axis of the receiving hole 95 at the top end 91 of the shaft 90 is offset from the central axis of the top end 91, causing the rotation axis of the second scroll member 20 to deviate from the rotation axis of the first scroll member 10. Furthermore, the centers of gravity of the first scroll member 10 and the second scroll member 20 are located on their respective rotation axes. This facilitates the mutual balancing of the centrifugal forces generated by the first scroll member 10 and the second scroll member 20 during rotation, thereby avoiding the need for a balance block to balance the centrifugal forces generated by the rotation of the scroll members 10 and 20, simplifying the structure of the compressor 1000 and reducing its size.

[0042] In addition, since the first scroll 10 and the second scroll 20 rotate together, the efficiency is twice that of a conventional scroll compressor (where one scroll rotates while the other scroll remains stationary). Therefore, the diameters of the first scroll 10 and the second scroll 20 can be made as small as possible while maintaining the same cooling capacity, thus making the compressor 1000 compact in structure.

[0043] With this configuration, the rotor 32 can drive the drive mechanism 70 to rotate, which in turn drives the second cover 80 and the first scroll member 10 to rotate. The first scroll member 10 then drives the second scroll member 20 and its mounting hub 23 to rotate, so that the pump 40 rotates relative to the fixed shaft 90. This allows oil used as a lubricant to be fed upward from the oil sump 120 to the relevant components of the compressor 1000 (thrust bearing, radial bearing, scroll members 10 and 20, seals, etc.) along the gap between the pump 40 and the feed channel 93.

[0044] See Figure 3 , 47. The retainer 33 has a connecting hub 331 and a cylindrical fixing portion 332, such that the rotor 32 is fixed to the fixing portion 332 on the outside of the connecting hub 331. The second end 712 of the receiving hub 71 is threaded to the connecting hub 331 on the inside of the connecting hub 331. A rolling bearing 34 (e.g., a thrust angular contact ball bearing) is mounted inside the connecting hub 331 and abutted against its upper side 341 by the second end 712 of the receiving hub 71. The lower end 3311 of the connecting hub 331 is provided with a radial protrusion 33111, and the lower side 342 of the rolling bearing 34 abuts against the radial protrusion 33111, facilitating the mounting of the rolling bearing 34 inside the connecting hub 331. In this way, when assembling the compressor 1000, the user can push the second end 712 of the receiving hub 71 against the rolling bearing 34 by turning the drive mechanism 70, so as to push the retainer 33 and the rotor 32 in a direction away from the stator 31, thereby overcoming the magnetic attraction between the stator 31 and the rotor 32, positioning the rotor 32 spaced apart from the stator 31, and maintaining the required gap between the rotor 32 and the stator 31.

[0045] See Figure 2 , 3 4 and 6, the bracket 60 abuts against the lower side 342 of the rolling bearing 34 to support the motor 30, and more specifically, the retainer 33. The bracket 60 supports the retainer 33 via the rolling bearing 34, but the bracket 60 does not contact the retainer 33; otherwise, the retainer 33 would be difficult to rotate relative to the fixed bracket 60. In other words, the retainer 33 is spaced apart from the bracket 60. The rolling bearing 34 reduces the frictional force between the bracket 60 and the retainer 33 during relative rotation, thereby facilitating the rotation of the rotor 32 and the retainer 33 relative to the bracket 60. More specifically, the bracket 60 also has a cylindrical receiving portion 68 and a stepped portion 69. The receiving portion 68 is used to receive the motor 30 and the retainer 33. The stepped portion 69 connects the receiving portion 68 and the fixed hub portion 67 to receive the rolling bearing 34, such that the lower side 342 of the rolling bearing 34 abuts against the top end 681 of the fixed hub portion 67 so that the retainer 33 is spaced apart from the receiving portion 68, thereby facilitating the rotation of the rotor 32 and the retainer 33 relative to the support 60.

[0046] See Figure 3 , 5Shaft 90 is provided with a shoulder 94. The bottom end 92 of shaft 90 is fixed to the fixed hub 67 of bracket 60 by a threaded connection, so that when assembling compressor 1000, the user can screw shaft 90 to abut the shoulder 94 against the upper side 341 of rolling bearing 34 to push retainer 33 and rotor 32 in a direction away from stator 31, thereby further overcoming the magnetic attraction between stator 31 and rotor 32 to position rotor 32 spaced apart from stator 31. Retainer 33 and drive mechanism 70 apply a torque to rolling bearing 34, and shaft 90 applies a reverse torque to rolling bearing 34 to fix rolling bearing 34 and prevent rolling bearing 34 from moving. In another embodiment of this application, shaft 90 can also be used alone to push retainer 33 and rotor 32 in a direction away from stator 31 to position rotor 32 spaced apart from stator 31.

[0047] When assembling the compressor 1000, the bracket 60 is first fixed to the housing 100 by an interference fit. Then, the rolling bearing 34 is installed inside the connecting hub 331 of the retainer 33, and the retainer 33, on which the rotor 32 is mounted, is rotatably mounted onto the bracket 60. At this point, the rolling bearing 34 is not in contact with the bracket 60 but is spaced apart from it. Subsequently, the stator 31 is bolted to the motor cover 50, and the motor cover 50 is bolted to the bracket 60, thus fixing the stator 31 to the bracket 60 and securing the motor 30. At this point, the stator 31 and the rotor 32 are attracted to each other by magnetic attraction. The receiving hub 71 of the drive mechanism 70 is then passed through the central hole of the stator 31 and the rotor 32, so that the drive mechanism 70 is threaded to the connecting hub 331 of the retainer 33 by means of the second end 712 of the receiving hub 71 and drives the retainer 33 and the rotor 32 downward by spinning until the lower side 342 of the rolling bearing (more specifically, the radial interior of the lower side 342) abuts against the top end 681 of the fixed hub 67 of the bracket 60. Specifically, by threading the receiving hub 71 of the drive mechanism 70 to the connecting hub 331, the second end 712 of the receiving hub 71 is pushed against the upper side 341 of the rolling bearing 34 in a direction away from the stator 31 (at this time, the rolling bearing 34 drives the retainer 33 and the rotor 32 to move together in a direction away from the stator 31), so that the rolling bearing 34 is completely fixed between the receiving hub 71 and the connecting hub 331 (more specifically, fixed between the second end 712 of the receiving hub 71 and the radial protrusion 33111 of the connecting hub 331), thereby positioning the rotor 32 to be spaced apart from the stator 31 and maintaining the required gap between the stator 31 and the rotor 32.

[0048] The shaft 90 is then mounted onto the bracket 60 by threading the bottom end 92 of the shaft 90 into the fixed hub 67 of the bracket 60, so that the shoulder 94 of the shaft 90 pushes against the upper side 341 of the rolling bearing 34 in a direction away from the stator 31 (at this time, the rolling bearing 34 drives the retainer 33 and the rotor 32 to move further in a direction away from the stator 31) until the lower side 342 of the rolling bearing 34 abuts against the top end 681 of the fixed hub 67 of the bracket 60 (at this time, the rolling bearing 34 is installed in place, and the shaft 90 can no longer push the rolling bearing 34 to move further, which means that the rotor 32, the retainer 33 and the drive mechanism 70 are also installed in place), thereby further maintaining the required clearance between the rotor 32 and the stator 31.

[0049] Those skilled in the art will understand that the embodiments described above are exemplary and can be improved upon. The structures described in the various embodiments can be freely combined without causing any conflict in structure or principle.

[0050] After a detailed description of the preferred embodiments of the present invention, those skilled in the art will clearly understand that various changes and modifications can be made without departing from the scope and spirit of the appended claims, and that the present invention is not limited to the embodiments described in the specification.

Claims

1. A compressor, comprising: case; A first scroll member and a second scroll member are located within a housing. The first scroll member has a first end plate and a first scroll extending from the first end plate toward the second scroll member. The second scroll member has a second end plate and a second scroll extending from the second end plate toward the first scroll member. The second scroll member engages with the first scroll member to define a compression cavity between them. The motor includes a stator and a rotor, and is located on the side of the second scroll member away from the first scroll member, for driving the first scroll member to rotate by driving the first scroll member to rotate; The drive mechanism includes a receiving hub and a flange extending radially from a first end of the receiving hub and supporting a second end plate; The second end of the receiving hub is fixed to the rotor to position the rotor at a certain gap from the stator. The compressor also includes: A retainer is used to hold the rotor in place; The second end of the receiving hub is fixed to the retainer radially inside the rotor to position the rotor spaced apart from the stator. The retainer has a connecting hub and a cylindrical fixing part, such that the rotor is fixed to the fixing part on the outside of the connecting hub, and the second end of the receiving hub is threaded to the connecting hub on the inside of the connecting hub. The compressor also includes: A rolling bearing is mounted inside the connecting hub of the retainer and abutted against its upper side by the second end of the receiving hub. A bracket, fixed to the housing and abutting against the underside of the rolling bearing, serves to support the retainer; and A shaft, fixed to a bracket and extending from the bracket into a receiving hub, is provided with abutting against the upper side of a rolling bearing to push the retainer and the rotor toward a direction away from the stator, thereby further positioning the rotor as a shoulder spaced apart from the stator.

2. The compressor according to claim 1, wherein, The bracket is provided with: The bottom end of the shaft extends into and is threaded into the fixed hub. A cylindrical housing for accommodating the motor and retainer; and A stepped portion, connecting the receiving portion and the fixed hub portion, is used to receive the rolling bearing, such that the lower side of the rolling bearing abuts against the top of the fixed hub portion.

3. The compressor according to claim 2, wherein, The top end of the shaft is located in the receiving hub and is provided with a receiving hole. The second end plate is provided with a mounting hub extending in a direction away from the first scroll member, and the mounting hub is received in the receiving hole.

4. The compressor according to claim 3, further comprising: The pump has a top end of a mounting hub operably connected in a receiving hole to a second end plate and a bottom end extending into an oil sump located at the bottom of the housing. in, The shaft is provided with a feed channel extending from its bottom end to its top end, and the pump is rotatably disposed in the feed channel to feed oil along the gap between the pump and the feed channel.

5. The compressor according to any one of claims 1 to 4, further comprising: The first cover, fixed to the bracket to cover the motor, is located between the stator and the flange and is received by the hub extending through it, wherein... The stator is fixed to the first cover.

6. The compressor according to claim 5, further comprising: The second cover has its top covered and fixed to the first end plate, and its sidewalls are fixed to the flange.

7. The compressor according to any one of claims 1 to 4 and 6, wherein, The rotor is located on the side of the stator opposite to the first cover.

8. The compressor according to claim 3 or 4, wherein, The central axis of the receiving hole of the shaft is collinear with the rotation axis of the second scroll member, the central axis of the top end of the shaft is collinear with the rotation axis of the first scroll member, and the central axis of the receiving hole is deviated from the central axis of the top end of the shaft, so that the rotation axis of the second scroll member is deviated from the rotation axis of the first scroll member.

9. The compressor according to any one of claims 1 to 4 and 6, wherein, The gap is in the range of 0.1 mm to 3 mm.

10. A method of assembling a compressor, the compressor comprising: The method comprises: a housing, a bracket with a fixed hub, a motor with a stator and a rotor, a retainer with a connecting hub, rolling bearings, and a drive mechanism with a receiving hub, wherein the method includes... Secure the bracket inside the housing; The rolling bearing is installed inside the connecting hub of the retainer; A retainer with the rotor mounted on it is rotatably mounted onto a bracket, and the stator is fixed to the bracket, wherein the stator and rotor are attracted to each other due to magnetic attraction; and By threading the receiving hub of the drive mechanism onto the connecting hub of the retainer, the drive mechanism is mounted onto the retainer, such that one end of the receiving hub pushes against the upper side of the rolling bearing in a direction away from the stator, causing the retainer and the rotor to move together in a direction away from the stator, thereby positioning the rotor spaced apart from the stator. The compressor further includes a shaft with a shoulder, and the method further includes: The shaft is mounted onto the bracket, wherein the bottom end of the shaft is fixed to the fixed hub of the bracket, so that the shoulder of the shaft is pushed against the upper side of the rolling bearing in a direction away from the stator to push the retainer and the rotor to move in a direction away from the stator until the lower side of the rolling bearing abuts against the top of the fixed hub of the bracket, thereby further maintaining the gap between the rotor and the stator.

11. The method according to claim 10, wherein the compressor further comprises: The first cover, wherein the step of fixing the stator to the bracket includes fixing the stator to the first cover, and then fixing the first cover to the bracket.

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