Stators, magnetic bearings and motors

Abstract

The present invention provides a stator, a magnetic bearing and a motor. The stator includes: a yoke, which is an annular structure, and the inner wall of the yoke is provided with assembly grooves at intervals in the circumferential direction; a tooth, which is used to set the winding, and one end of the tooth is an assembly end, which is matched and connected with the assembly groove; a limiting structure, which is used to prevent the tooth from moving axially relative to the yoke. In this way, the tooth and the yoke become separate structures. During production, the winding is first wound onto the tooth, and then the assembly end of the tooth is connected to the assembly groove of the yoke. In this way, there is no interference when winding the winding, which facilitates automatic winding, so the winding can be wound conveniently. Moreover, by setting the limiting structure, the relative movement of the yoke and the tooth in the axial direction can be avoided, thereby improving the structural strength and reliability of the stator.

Description

Technical Field

[0001] The present invention relates to the technical field of stator cores, and in particular to a stator, a magnetic suspension bearing and a motor. Background Art

[0002] In the prior art, the stator in the magnetic bearing or motor is composed of a whole piece of silicon steel sheet punching and a stator baffle. The silicon steel sheet punching is stacked to form the stator body, and the stator baffles on both end faces are welded together with the silicon steel sheets. While playing a protective role, an axial force is applied to the silicon steel sheets on the end faces to play a clamping role. For this kind of stator core, since the stator body is an integrated structure and the stator baffle has an obstructive effect, the winding cannot be automated and the winding coil needs to be wound manually, which is not only inefficient but also has a high error rate. If the winding is found to be wrong after the winding is completed, the winding after the abnormal position needs to be removed and rewound, and the fault tolerance rate is extremely low. Summary of the invention

[0003] The present invention provides a stator, a magnetic suspension bearing and a motor to solve the problem in the prior art that it is inconvenient to wind windings on the stator.

[0004] In order to solve the above-mentioned problem, according to one aspect of the present invention, the present invention provides a stator, comprising: a yoke portion, the yoke portion is an annular structure, and assembly grooves are arranged on the inner wall of the yoke at intervals along the circumferential direction; a tooth portion, the tooth portion is used to set the winding, one end of the tooth portion is the assembly end, and the assembly end is matched and connected with the assembly groove; a limiting structure, the limiting structure is used to prevent the tooth portion from moving axially relative to the yoke portion.

[0005] Furthermore, a positioning key is protruding from the bottom of the assembly groove, and the axial dimension of the positioning key in the yoke is smaller than the axial dimension of the assembly groove in the yoke. A positioning groove is provided on the end face of the assembly end, and the positioning groove cooperates with the positioning key to form a limiting structure.

[0006] Furthermore, a first connecting hole is provided on the side wall of the yoke, the first connecting hole is connected to the assembly groove, and a second connecting hole is provided on the end surface of the assembly end. The stator also includes: a first fastener, the first fastener is cooperatively connected with the first connecting hole and the second connecting hole, and the first connecting hole, the second connecting hole and the first fastener form a limiting structure.

[0007] Furthermore, the first connecting hole is a countersunk hole, the second connecting hole has an internal thread, and the first fastener is a bolt.

[0008] Furthermore, a first groove is provided on the end face of the yoke, a second groove is provided on the side face of the tooth portion, the first groove and the second groove cooperate to form a cylindrical hole, and the stator also includes: a second fastener, the second fastener is arranged in the cylindrical hole, and the cylindrical hole and the second fastener form a limiting structure.

[0009] Furthermore, both end faces of the yoke have a first groove, and the first groove on one end face of the yoke is located on one side wall of the assembly groove, and the first groove on the other end face of the yoke is located on the other side wall of the assembly groove; both side faces of the tooth have a second groove, wherein the second groove on one side face of the tooth cooperates with the first groove on one end face of the yoke, and the second groove on the other side face of the tooth cooperates with the first groove on the other end face of the yoke.

[0010] Furthermore, a tapered internal thread is provided in the cylindrical hole, and the second fastener is a tapered screw.

[0011] Furthermore, the inner wall of the yoke has an expansion slot, which is arranged along the axial direction of the yoke and located between two adjacent assembly slots. The stator also includes: an expansion piece that cooperates with the expansion slot and can adjust the circumferential size of the expansion slot in the yoke.

[0012] Furthermore, the expansion groove includes a conical hole and a gap, both of which extend along the axial direction of the yoke. The opening of the conical hole is located on the end face of the yoke, and the gap is located on the inner surface of the yoke and connected to the conical hole. The expansion piece is a conical screw, and the expansion piece cooperates with the conical hole.

[0013] Furthermore, the stator also includes an insulating frame, which includes: a cylinder, in which the teeth are inserted; a first limiting ring, which is arranged at one end of the cylinder; and a second limiting ring, which is arranged at the other end of the cylinder.

[0014] According to another aspect of the present invention, a magnetic bearing is provided, comprising a stator, wherein the stator is the stator provided above.

[0015] According to another aspect of the present invention, there is provided a motor, comprising a stator, wherein the stator is the stator provided above.

[0016] By applying the technical solution of the present invention, an assembly groove is provided on the inner wall of the annular yoke, and a separate tooth portion is provided, so that the tooth portion and the yoke portion become a separate structure. During production, the winding is first wound onto the tooth portion, and then the assembly end of the tooth portion is connected to the assembly groove of the yoke portion, so that there is no interference when winding the winding, which facilitates automatic winding, and thus facilitates winding the winding. Moreover, by providing a limiting structure, relative movement of the yoke and the tooth portion in the axial direction can be avoided, thereby improving the structural strength and reliability of the stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1A schematic structural diagram of a stator provided in Embodiment 1 of the present invention is shown;

[0019] Figure 2 Shows Figure 1 A schematic diagram of the structure of the yoke in FIG.

[0020] Figure 3 Shows Figure 1 A schematic diagram of the structure of the tooth portion;

[0021] Figure 4 A schematic structural diagram of a stator provided in the second embodiment of the present invention is shown;

[0022] Figure 5 Shows Figure 4 A schematic diagram of the structure of the yoke in FIG.

[0023] Figure 6 Shows Figure 4 A schematic diagram of the structure of the tooth portion;

[0024] Figure 7 A schematic structural diagram of a stator provided in Embodiment 3 of the present invention is shown;

[0025] Figure 8 Shows Figure 7 A schematic diagram of the structure of the yoke in FIG.

[0026] Fig. 9 Shows Figure 7 Schematic diagram of the structure of the tooth part.

[0027] The above drawings include the following reference numerals:

[0028] 10. Yoke; 11. Assembly groove; 12. Expansion groove; 121. Conical hole; 122. Gap; 20. Tooth; 31. Positioning key; 32. Positioning groove; 33. First connecting hole; 34. Second connecting hole; 35. First fastener; 36. First groove; 37. Second groove; 38. Second fastener; 40. Expansion piece; 50. Insulating frame; 51. Cylinder; 52. First limiting ring; 53. Second limiting ring. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figures 1 to 3 As shown, the first embodiment of the present invention provides a stator, including: a yoke 10, the yoke 10 is an annular structure, and the inner wall of the yoke 10 is provided with assembly grooves 11 at intervals along the circumferential direction; a tooth 20, the tooth 20 is used to set the winding, one end of the tooth 20 is an assembly end, and the assembly end is matched and connected with the assembly groove 11; a limiting structure, the limiting structure is used to prevent the tooth 20 from moving relative to the axial direction of the yoke 10. The assembly end of the tooth 20 refers to the end of the tooth 20 connected to the yoke 10.

[0031] By applying the technical solution of this embodiment, an assembly groove 11 is provided on the inner wall of the annular yoke 10, and a separate tooth portion 20 is provided, so that the tooth portion 20 and the yoke 10 become a separate structure. During production, the winding is first wound onto the tooth portion 20, and then the assembly end of the tooth portion 20 is connected to the assembly groove 11 of the yoke 10. In this way, there is no interference when winding the winding, which facilitates automatic winding, and thus the winding can be conveniently wound. Moreover, by providing a limiting structure, relative movement of the yoke 10 and the tooth portion 20 in the axial direction can be avoided, thereby improving the structural strength and reliability of the stator. In this embodiment, both the assembly groove 11 and the tooth portion 20 can be provided in plurality, and the plurality of tooth portions 20 are connected to the plurality of assembly grooves 11 in a one-to-one correspondence.

[0032] like Figure 2 and Figure 3 As shown, a positioning key 31 is protruding from the bottom of the assembly groove 11, and the axial dimension of the positioning key 31 in the yoke 10 is smaller than the axial dimension of the assembly groove 11 in the yoke 10. A positioning groove 32 is provided on the end surface of the assembly end, and the positioning groove 32 cooperates with the positioning key 31, and the positioning groove 32 and the positioning key 31 form a limiting structure. In this way, the tooth portion 20 can be limited by the cooperation of the positioning groove 32 and the positioning key 31, and after the assembly is completed, the tooth portion 20 is prevented from moving in the axial direction relative to the yoke 10. Specifically, the positioning groove 32 is a through groove on the end surface of the assembly end, and the shape of the positioning key 31 matches the positioning groove 32.

[0033] The yoke 10 is made of silicon steel sheets welded together, and the end faces on both sides can be processed by a milling machine to form an assembly groove 11 and a positioning key 31. The tooth part 20 is manufactured by fixing methods such as silicon steel sheet buckle points or welded together, and a positioning groove 32 is processed by a milling machine at the assembly end of the tooth part 20. Since the tooth part 20 is divided into separate blocks, the compactness of the punching sheets is more uniform, which has a certain improvement on the electromagnetic performance of the stator.

[0034] In this embodiment, the inner wall of the yoke 10 is provided with an expansion slot 12, which is arranged along the axial direction of the yoke 10 and is located between two adjacent assembly slots 11. The stator further includes an expansion member 40, which cooperates with the expansion slot 12, and the expansion member 40 can adjust the circumferential size of the expansion slot 12 in the yoke 10. In this way, after the tooth 20 is assembled to the yoke 10, the expansion slot 12 can be appropriately expanded by the expansion member 40, so that the side wall of the assembly slot 11 clamps the tooth 20 in the circumferential direction, thereby improving the connection strength between the yoke 10 and the tooth 20. Moreover, the clamping degree of the assembly slot 11 can be adjusted to facilitate the assembly operation.

[0035] Specifically, Figure 2 As shown, the expansion groove 12 includes a tapered hole 121 and a gap 122, both of which extend along the axial direction of the yoke 10, the opening of the tapered hole 121 is located on the end face of the yoke 10, the gap 122 is located on the inner surface of the yoke 10 and is connected to the tapered hole 121, and the expansion member 40 is a tapered screw, and the expansion member 40 cooperates with the tapered hole 121. In this way, the size of the gap 122 can be adjusted by the depth of the expansion member 40 screwed into the tapered hole 121, so that the side wall of the assembly groove 11 clamps the tooth portion 20 in the circumferential direction. With this arrangement, the structure is simple and easy to operate. In this embodiment, two connected tapered holes 121 can be relatively arranged on the two end faces of the yoke 10, and the gap 122 can be expanded by screwing the tapered screws into the two tapered holes 121 respectively.

[0036] In this embodiment, the stator further includes an insulating frame 50, which includes: a cylinder 51, in which the tooth portion 20 is inserted; a first limiting ring 52, which is arranged at one end of the cylinder 51; and a second limiting ring 53, which is arranged at the other end of the cylinder 51. The insulating frame 50 can play an insulating role, and the first limiting ring 52 and the second limiting ring 53 can limit the winding, which is convenient for winding. In this embodiment, the tooth portion 20 can be set as a columnar structure, which is simple in structure and easy to manufacture.

[0037] like Figures 4 to 6 As shown, in the second embodiment of the present invention, different from the above embodiment, the side wall of the yoke 10 has a first connection hole 33, the first connection hole 33 is connected to the assembly groove 11, and the end surface of the assembly end has a second connection hole 34. The stator also includes: a first fastener 35, the first fastener 35 is matched and connected with the first connection hole 33 and the second connection hole 34, and the first connection hole 33, the second connection hole 34 and the first fastener 35 form a limiting structure. In this way, the connection between the tooth portion 20 and the yoke 10 can be achieved through the cooperation of the first fastener 35 with the first connection hole 33 and the second connection hole 34.

[0038] Specifically, the first connection hole 33 is a countersunk hole, the second connection hole 34 has an internal thread, and the first fastener 35 is a bolt. The countersunk hole can prevent the bolt from protruding from the outer peripheral surface of the yoke 10. Through the above arrangement, the tooth portion 20 can be prevented from moving in the axial, radial and circumferential directions relative to the yoke 10, thereby improving the connection strength between the two.

[0039] like Figures 7 to 9 As shown, in the third embodiment of the present invention, different from the above embodiments, the end surface of the yoke 10 has a first groove 36, the side surface of the tooth 20 has a second groove 37, the first groove 36 and the second groove 37 cooperate to form a cylindrical hole, and the stator also includes: a second fastener 38, the second fastener 38 is arranged in the cylindrical hole, and the cylindrical hole and the second fastener 38 form a limiting structure. In this way, the cooperation of the tooth 20 and the yoke 10 can be achieved through the cooperation of the first groove 36, the second groove 37 and the second fastener 38, and the tooth 20 can be limited in the axial, circumferential and radial directions of the yoke 10, and the connection is reliable and firm.

[0040] Further, both end surfaces of the yoke 10 have first grooves 36, and the first groove 36 on one end surface of the yoke 10 is located on one side wall of the assembly groove 11, and the first groove 36 on the other end surface of the yoke 10 is located on the other side wall of the assembly groove 11; both side surfaces of the tooth 20 have second grooves 37, wherein the second groove 37 on one side surface of the tooth 20 cooperates with the first groove 36 on one end surface of the yoke 10, and the second groove 37 on the other side surface of the tooth 20 cooperates with the first groove 36 on the other end surface of the yoke 10. Through the above arrangement, the connection strength between the tooth 20 and the yoke 10 can be further improved.

[0041] In this embodiment, the cylindrical hole has a tapered internal thread, and the second fastener 38 is a tapered screw. Thus, by adjusting the depth of the second fastener 38 screwed into the cylindrical hole, the yoke 10 and the toothed portion 20 can be tightened, and the degree of tightening can be adjusted, thereby achieving a reliable connection between the two. In the embodiment, since the second fastener 38 has an expansion function, the expansion slot 12 may not be provided on the yoke 10.

[0042] Another embodiment of the present invention provides a magnetic bearing, including a stator, which is the stator provided above. Applying the technical solution of this embodiment, a plurality of assembly grooves 11 are provided on the inner wall of the annular yoke 10, and a plurality of separate teeth 20 are provided, so that the teeth 20 and the yoke 10 become separate structures. During production, the winding is first wound onto the teeth 20, and then the assembly end of the teeth 20 is connected to the assembly groove 11 of the yoke 10, so that there is no interference when winding the winding, which facilitates automatic winding, and thus the winding can be conveniently wound. Moreover, by providing a limiting structure, relative movement of the yoke 10 and the teeth 20 in the axial direction can be avoided, thereby improving the structural strength and reliability of the stator. Specifically, the magnetic bearing is a magnetic radial bearing. By adopting this technical solution, the production efficiency of the magnetic radial bearing stator can be improved, the stator thickness can be reduced, and the assembly accuracy can be improved.

[0043] Another embodiment of the present invention provides a motor, including a stator, wherein the stator is the stator of any one of the first to third embodiments.

[0044] Through the technical scheme of the present invention, the following technical effects can be achieved: since the poles (i.e., the teeth) are independent of each other relative to the yoke, an automatic winding machine can be used to wind the windings on each pole separately, and mechanized winding can greatly improve production efficiency; secondly, since the poles are independent of each other during winding, once an error occurs in the winding, it is only necessary to replace them with poles with normal winding, and there is no need to remove the already wound windings and re-wind the winding process, which greatly improves the fault tolerance of the production process; in addition, since the yoke is separated from the pole, the end face flatness is improved, which can improve the assembly accuracy of the stator and the bearing housing; the tooth punching sheets are divided into blocks, and the stacking is more uniform, which has a certain improvement on the electromagnetic performance of the stator.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stator, characterized in that: include: A yoke (10), wherein the yoke (10) is an annular structure, and assembly grooves (11) are arranged at intervals along the circumferential direction on the inner wall of the yoke (10); A tooth portion (20), the tooth portion (20) being used to set a winding, one end of the tooth portion (20) being an assembly end, the assembly end being cooperatively connected to the assembly groove (11); a limiting structure, the limiting structure being used to prevent the tooth portion (20) from moving axially relative to the yoke portion (10); The inner wall of the yoke (10) is provided with an expansion groove (12), and the expansion groove (12) is arranged along the axial direction of the yoke (10). The expansion groove (12) is located between two adjacent assembly grooves (11). The stator also includes: an expansion piece (40) that cooperates with the expansion groove (12), and the expansion piece (40) can adjust the circumferential size of the expansion groove (12) on the yoke (10).

2. The stator according to claim 1, characterized in that: A positioning key (31) is protruding from the bottom of the assembly groove (11), and the axial dimension of the positioning key (31) on the yoke (10) is smaller than the axial dimension of the assembly groove (11) on the yoke (10). A positioning groove (32) is provided on the end surface of the assembly end, and the positioning groove (32) cooperates with the positioning key (31), and the positioning groove (32) and the positioning key (31) form the limiting structure.

3. The stator according to claim 1, characterized in that: The side wall of the yoke (10) is provided with a first connection hole (33), the first connection hole (33) is connected to the assembly groove (11), and the end surface of the assembly end is provided with a second connection hole (34), and the stator further comprises: A first fastener (35), wherein the first fastener (35) is cooperatively connected with the first connecting hole (33) and the second connecting hole (34), and the first connecting hole (33), the second connecting hole (34) and the first fastener (35) form the limiting structure.

4. The stator according to claim 3, characterized in that: The first connecting hole (33) is a countersunk hole, the second connecting hole (34) has an internal thread, and the first fastener (35) is a bolt.

5. The stator according to claim 1, characterized in that: The end surface of the yoke (10) is provided with a first groove (36), the side surface of the tooth portion (20) is provided with a second groove (37), the first groove (36) and the second groove (37) cooperate to form a cylindrical hole, and the stator further comprises: A second fastener (38), wherein the second fastener (38) is arranged in the cylindrical hole, and the cylindrical hole and the second fastener (38) form the limiting structure.

6. The stator according to claim 5, characterized in that: The two end surfaces of the yoke (10) are each provided with the first groove (36), and the first groove (36) on one end surface of the yoke (10) is located on one side wall of the assembly groove (11), and the first groove (36) on the other end surface of the yoke (10) is located on the other side wall of the assembly groove (11); The second groove (37) is provided on both side surfaces of the tooth portion (20), wherein the second groove (37) on one side surface of the tooth portion (20) cooperates with the first groove (36) on one end surface of the yoke portion (10), and the second groove (37) on the other side surface of the tooth portion (20) cooperates with the first groove (36) on the other end surface of the yoke portion (10).

7. The stator according to claim 5, characterized in that: The cylindrical hole has a tapered internal thread, and the second fastener (38) is a tapered screw.

8. The stator according to claim 1, characterized in that: The expansion groove (12) includes a tapered hole (121) and a gap (122), and the tapered hole (121) and the gap (122) both extend along the axial direction of the yoke (10). The opening of the tapered hole (121) is located on the end surface of the yoke (10), and the gap (122) is located on the inner surface of the yoke (10) and communicates with the tapered hole (121). The expansion member (40) is a tapered screw, and the expansion member (40) cooperates with the tapered hole (121).

9. The stator according to claim 1, characterized in that: The stator further comprises an insulating frame (50), wherein the insulating frame (50) comprises: A cylinder (51), wherein the tooth portion (20) is inserted into the cylinder (51); A first limiting ring (52) is arranged at one end of the cylinder (51); The second limiting ring (53) is arranged at the other end of the cylinder (51).

10. A magnetic bearing, comprising a stator, characterized in that: The stator is the stator according to any one of claims 1 to 9.

11. A motor, comprising a stator, characterized in that: The stator is the stator according to any one of claims 1 to 9.

Images