Bearing structure and magnetic levitation motor

Abstract

The embodiment of the application provides a bearing structure and a magnetic suspension motor, a first connecting part is arranged on an upper framework, a second connecting part is arranged on a lower framework, and the first connecting part, the second connecting part and an iron core are connected through a connecting piece, the connecting mode changes the connecting mode of the bearing framework (the upper framework and the lower framework) of the existing bearing structure, the lower framework, the upper framework and the iron core are connected through the connecting piece, the whole bearing structure is more closely connected, the bearing framework is effectively prevented from falling off, and therefore the stability and the safety of the whole bearing structure are improved.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, and in particular to a bearing structure and a magnetic levitation motor. Background Technology

[0002] A magnetic levitation motor is a low-loss, high-performance motor. Specifically, it levitates the motor rotor in the air through the electromagnetic force of a magnetic bearing, eliminating mechanical contact between the rotor and stator and thus preventing mechanical friction losses. The coaxiality of the magnetic bearing affects the magnitude of the electromagnetic force; therefore, a high degree of coaxiality is necessary for a stronger electromagnetic force. Maintaining high coaxiality depends not only on the precision of the components themselves but also on the assembly process.

[0003] The existing bearing assembly method involves interlocking the upper and lower frames together, then clamping the iron core between them to form a single unit. However, this assembly method is not robust. During motor operation, vibrations and noise are generated. After prolonged operation, the upper and lower frames and the iron core are prone to displacement or even detachment, leading to motor damage and posing a certain safety risk. Summary of the Invention

[0004] This invention provides a bearing structure and a magnetic levitation motor, aiming to solve the problems of unstable assembly and easy positional displacement in existing bearing structures.

[0005] This invention provides a bearing structure, comprising: an upper frame, a lower frame, and an iron core, all of which are annular. The upper frame and the lower frame are axially connected. The iron core is disposed on the outer ring at the connection between the upper frame and the lower frame. The upper frame has a first connecting portion on the side facing the lower frame, and the lower frame has a second connecting portion on the side facing the upper frame. The first connecting portion, the second connecting portion, and the iron core are connected by a connector.

[0006] Specifically, the connector connects the first connecting part, the second connecting part, and the iron core in the radial direction of the bearing structure.

[0007] Specifically, the end of the first connecting part is provided with a recessed portion, and the second connecting part is inserted into the recessed portion; or, the end of the second connecting part is provided with a recessed portion, and the first connecting part is inserted into the recessed portion.

[0008] Specifically, the iron core is provided with an axially penetrating groove, and both the first connecting part and the second connecting part are located in the groove.

[0009] Specifically, the first connecting part and the second connecting part are respectively radially provided with a first connecting hole and a second connecting hole, and the side of the iron core is radially provided with a third connecting hole that penetrates the groove. The connector connects the first connecting hole, the second connecting hole and the third connecting hole.

[0010] Specifically, multiple connectors are provided and are spaced apart circumferentially along the bearing structure.

[0011] Specifically, it also includes ring-shaped aluminum strips;

[0012] The aluminum strip has an annular protrusion, and the bottom of the iron core has a corresponding annular groove, in which the annular protrusion is inserted; or, the bottom of the iron core has an annular protrusion, and the aluminum strip has a corresponding annular groove, in which the annular protrusion is inserted.

[0013] Specifically, the iron core includes an inner ring and an outer ring disposed around the outer periphery of the inner ring, the groove is disposed on the inner ring, and the annular groove or annular protrusion is disposed on the bottom of the outer ring.

[0014] Specifically, the bottom of the outer ring of the iron core extends outward relative to the inner ring of the iron core.

[0015] This invention also provides a magnetic levitation motor, including the bearing structure described above.

[0016] This invention provides a bearing structure and a magnetic levitation motor. By setting a first connecting part in the upper frame and a second connecting part in the lower frame, and then connecting the first connecting part, the second connecting part and the iron core through a connector, this connection method changes the connection method of the bearing frame (upper frame and lower frame) in the existing bearing structure. By connecting the lower frame, the upper frame and the iron core through a connector, the entire bearing structure is more tightly connected, and the bearing frame is effectively prevented from falling off, thereby improving the stability and safety of the entire bearing structure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a bearing structure provided in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the upper skeleton structure provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the lower skeleton structure provided in an embodiment of the present invention;

[0021] Figure 4 This is a cross-sectional connection diagram of a bearing structure provided in an embodiment of the present invention;

[0022] Figure 5 for Figure 4 Enlarged view of the A structure;

[0023] Figure 6 This is a top view of the upper frame structure provided in an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the upper skeleton from another angle according to an embodiment of the present invention;

[0025] Figure 8 This is a top view of the lower frame structure provided in an embodiment of the present invention;

[0026] Figure 9 This is a schematic diagram of the lower skeleton structure from another angle according to an embodiment of the present invention;

[0027] Figure 10 This is a schematic diagram of the structure of an iron core provided in an embodiment of the present invention;

[0028] Figure 11 This is a schematic diagram of another angle of the iron core structure provided in one embodiment of the present invention;

[0029] Figure 12 This is another cross-sectional connection diagram provided in an embodiment of the present invention;

[0030] Figure 13 A top view of the aluminum strip provided in another embodiment of the present invention;

[0031] Figure 14 This is another structural schematic diagram of an aluminum strip provided in another embodiment of the present invention;

[0032] Figure 15 A cross-sectional connection diagram of a bearing structure provided in another embodiment of the present invention;

[0033] Figure 16 for Figure 15 Enlarged view of the B structure;

[0034] Figure 17 This is a top view schematic diagram of a bearing structure provided in another embodiment of the present invention;

[0035] Figure 18 This is a front view schematic diagram of a bearing structure provided for another embodiment of the present invention.

[0036] Explanation of the markings in the image:

[0037] 1. Upper frame; 11. First connecting part; 111. Recessed part; 12. First connecting hole; 13. Accommodating space;

[0038] 2. Lower frame; 21. Second connecting part; 22. Second connecting hole;

[0039] 3. Iron core; 31. Groove; 32. Third connecting hole; 33. Annular groove; 34. Inner ring of iron core; 35. Outer ring of iron core;

[0040] 4. Connectors;

[0041] 5. Aluminum strip; 51. Annular protrusion. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0044] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0045] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0046] The bearing structure provided in this invention is used in a magnetic levitation motor. In a magnetic levitation motor, the bearing structure typically includes two radial bearings and two axial bearings. The radial bearings provide forces in four directions to constrain the radial position of the motor rotor, while the axial bearings provide axial forces to keep the motor rotor balanced in the axial position. Therefore, for the magnetic levitation motor to operate normally, both the axial and radial bearings need to maintain a high degree of coaxiality. This invention primarily relates to a structure that improves the coaxiality of the axial bearings.

[0047] Please see Figures 1-5 This invention provides a bearing structure comprising an upper frame 1, a lower frame 2, and an iron core 3, all of which are annular. The upper frame 1 and the lower frame 2 are axially connected. The iron core 3 is disposed on the outer ring at the connection between the upper frame 1 and the lower frame 2. A first connecting part 11 is provided on the side of the upper frame 1 facing the lower frame 2, and a second connecting part 21 is provided on the side of the lower frame 2 facing the upper frame 1. The first connecting part 11, the second connecting part 21, and the iron core 3 are connected by a connector 4.

[0048] In this embodiment, the bearing structure includes an upper frame 1, a lower frame 2, and an iron core 3. The upper frame 1 and the lower frame 2 are connected axially. The specific connection method of the entire bearing structure is as follows: a first connecting part 11 is provided on the upper frame 1, and a second connecting part 21 is provided on the lower frame 2. An iron core 3 is provided around the outer ring of the first connecting part 11 and the second connecting part 21. The first connecting part 11, the second connecting part 21, and the iron core 3 are connected by a connector 4. This connection method changes the connection method of the bearing frame (upper frame 1 and lower frame 2) in the existing bearing structure. By connecting the lower frame 2, the upper frame 1, and the iron core 3 with the connector 4, the entire bearing structure is more tightly connected, and the bearing frame is effectively prevented from falling off, thereby improving the stability and safety of the entire bearing structure. Moreover, by Figure 2 and Figure 3 It can be seen that both the upper frame 1 and the lower frame 2 are double-layered annular structures. The connecting parts (first connecting part 11 and second connecting part 21) are set on one of the annular structures. When assembling the bearing frame, the annular structures with connecting parts are arranged opposite each other, and the first connecting part 11 and the second connecting part 21 are connected to assemble the bearing frame. Among them, the first connecting part 11 and the second connecting part 21 are both protrusions.

[0049] Specifically, such as Figure 1 , Figure 4 and Figure 5 As shown, the connector 4 connects the first connecting part 11, the second connecting part 21 and the iron core 3 in the radial direction of the bearing structure.

[0050] In this embodiment, the bearing skeleton is connected axially. To enhance the stability of the bearing structure, the connector 4 preferably connects the first connecting part 11, the second connecting part 21, and the iron core 3 in the radial direction. This allows for greater locking of the upper skeleton 1, the lower skeleton 2, and the iron core 3, solving the problem of loose connection between the upper skeleton 1 and the lower skeleton 2, which can easily lead to displacement. Furthermore, the connection between the connector 4 and the first connecting part 11, the second connecting part 21, and the iron core 3 can be detachable. This allows for adjustment of the coaxiality of the bearing structure according to the magnitude of the electromagnetic force. Additionally, if the connection of the connector 4 is not tight enough, it is easy to disassemble and replace the connector 4.

[0051] Specifically, the upper frame 1 and the lower frame 2 have two axial connection methods, such as... Figures 6-9 As shown, the first type involves a recess 111 at the end of the first connecting portion 11, into which the second connecting portion 21 is inserted; the second type involves a recess 111 at the end of the second connecting portion 21, into which the first connecting portion 11 is inserted. It should be noted that either the second connecting portion 21 or the first connecting portion 11 needs to be inserted into the recess 111, therefore the size of the connecting portion with the recess 111 is larger than the size of the connecting portion without the recess 111. Figure 5 As shown, in the first axial connection method, the first connecting part 11 is provided with a recess 111. The size of the recess 111 needs to be adapted to the second connecting part 21 so that the second connecting part 21 can be inserted into the recess 111. That is, the first connecting part 11 wraps the second connecting part 21 through the recess 111. Therefore, the size of the first connecting part 11 is larger than the size of the second connecting part 21. Conversely, if the end of the second connecting part 21 is provided with a recess 111, then the size of the second connecting part 21 is larger than the size of the first connecting part 11. Then the first connecting part 11 is inserted into the recess 111.

[0052] Specifically, such as Figures 10-11 As shown, and in combination Figure 1 As shown, the iron core 3 is provided with an axially penetrating groove 31, and the first connecting part 11 and the second connecting part 21 are both located in the groove 31.

[0053] This embodiment mainly describes the connection method between the iron core 3 and the upper frame 1 and the lower frame 2. Specifically, an axially penetrating groove 31 is provided on the iron core 3. The size of the groove 31 is adapted to the size of the connecting part with the recessed part 111. This allows the first connecting part 11 and the second connecting part 21 to be inserted into the groove 31, thereby forming a stable connection.

[0054] In specific embodiments, such as Figure 2 , Figure 3 and Figure 11 , Figure 12 As shown, the first connecting part 11 and the second connecting part 21 are respectively radially provided with a first connecting hole 12 and a second connecting hole 22, and the side of the iron core 3 is radially provided with a third connecting hole 32 that penetrates the groove 31. The connector 4 connects the first connecting hole 12, the second connecting hole 22 and the third connecting hole 32.

[0055] In this embodiment, the first connecting part 11, the second connecting part 21, and the side of the iron core 3 are all radially provided with connecting holes, and the third connecting hole 32 is provided through the groove 31. At the same time, the first connecting part 11 and the second connecting part 21 are both located in the groove 31. The connecting piece 4 passes through the iron core 3, the first connecting part 11, and the second connecting part 21 in sequence, so that the upper frame 1, the lower frame 2, and the iron core 3 are tightly connected, and effectively prevent the bearing frame from shifting or even falling off after being subjected to force, thereby improving the safety and stability of the bearing structure and increasing the control accuracy of the bearing structure over the rotor. Among them, the connecting piece 4 can be a countersunk screw.

[0056] In a specific embodiment, the first connecting part 11 and the second connecting part 21 can be set in an arc shape, with the arc being the same as that of the upper frame 1 and the lower frame 2, respectively. This makes the connecting part coaxial with the bearing frame, improving the stability of the entire bearing structure. Alternatively, the first connecting part 11 and the second connecting part 21 can also be set in an annular shape, respectively arranged circumferentially on the upper frame 1 and the lower frame 2 to form an annular connecting part. Then, the first connecting hole 12 and the second connecting hole 22 are respectively provided on the side of the annular connecting part, and the upper frame 1, the lower frame 2 and the iron core 3 are connected by the connector 4.

[0057] Specifically, such as Figure 4 As shown, there are multiple connectors 4, which are spaced apart circumferentially along the bearing structure.

[0058] In this embodiment, the upper frame 1, lower frame 2, and iron core 3 are all annular structures. To make the connection between the three more compact, multiple first connecting parts 11 and second connecting parts 21 are provided, and multiple first connecting holes 12, second connecting holes 22, and third connecting holes 32 on the side of the iron core 3 are also provided. The connector 4 can pass through the first connecting hole 12, second connecting hole 22, and third connecting hole 32 to fix the three together. Alternatively, the first connecting hole 12 and second connecting hole 22 can be set as radially penetrating connecting holes, so that the connector 4 can pass through one side of the iron core 3 and one side of the first connecting part 11 in sequence, then through the second connecting part 21, and then through the other side of the first connecting part 11 to achieve a fixed connection between the three.

[0059] Specifically, such as Figure 11 , Figure 13 and Figure 14 As shown, it also includes an annular aluminum strip 5;

[0060] The aluminum strip 5 has an annular protrusion 51, and the bottom of the iron core 3 has a corresponding annular groove 33, in which the annular protrusion 51 is inserted; or, the bottom of the iron core 3 has an annular protrusion 51, and the aluminum strip 5 has a corresponding annular groove 33, in which the annular protrusion 51 is inserted.

[0061] In this embodiment, the aluminum strip 5 is disposed on the periphery of the lower frame 2 and connected to the bottom of the iron core 3. Specifically, the aluminum strip 5 has an annular protrusion 51 on the side facing the bottom of the iron core 3. The annular protrusion 51 is inserted into the annular groove 33 at the bottom of the iron core 3 and connected to the iron core 3. Conversely, the bottom of the iron core 3 has an annular protrusion 51, and the aluminum strip 5 has a corresponding annular groove 33. The annular protrusion 51 is inserted into the annular groove 33 and connected to the aluminum strip 5. Both of these connection methods can improve the coaxiality of the iron core 3 and the aluminum strip 5, thereby further improving the coaxiality of the bearing structure. Moreover, the entire installation process simplifies the installation process and reduces the interference of external factors on the axial bearing control accuracy.

[0062] Specifically, such as Figure 11 As shown, the iron core 3 includes an inner ring 34 and an outer ring 35 disposed on the outer periphery of the inner ring 34. A groove 31 is disposed on the inner ring 34, and an annular groove 33 or an annular protrusion 51 is disposed on the bottom of the outer ring 35.

[0063] In this embodiment, as Figures 15-16 As shown, the iron core 3 is connected to both the upper frame 1 and the lower frame 2, and also to the aluminum strip 5. A groove 31 is provided on the side of the iron core 3 facing the upper frame 1, which matches the first connecting part 11. An annular groove 33 is provided on the side of the iron core 3 facing the aluminum strip 5, which matches the annular protrusion 51. This ensures that the upper frame 1, iron core 3, lower frame 2, and aluminum strip 5 are tightly connected axially from top to bottom. Furthermore, the iron core 3 is located around the connection between the upper frame 1 and the lower frame 2, and the aluminum strip 5 is located around the lower frame 2 and connected to the bottom of the iron core 3. Therefore, the bottom of the outer ring 35 of the iron core extends outward relative to the inner ring 34 of the iron core, meaning the outer ring 35 of the iron core is closer to the aluminum strip 5 than the inner ring 34 of the iron core. This increases the annular diameter of the entire structure from top to bottom (e.g., ...). Figure 17-18 This improves the stability and coaxiality of the bearing structure.

[0064] This invention also provides a magnetic levitation motor, including the bearing structure as described in the foregoing embodiments.

[0065] In this embodiment, the magnetic levitation motor also includes a housing and a coil. The housing has a receiving space, and there is also a receiving space between the two annular structures of the upper frame 1 and the lower frame 2. The receiving space 13 of the upper frame 1 is as follows: Figure 2 As shown, the lower frame 2 has a similar structure to the upper frame 1, so the location of the accommodating space can be referenced. Figure 2 The outer shell's accommodating space is used to accommodate the entire bearing structure, providing protection and fixation for the bearing structure. The accommodating spaces of the upper frame 1 and lower frame 2 are used to accommodate the coils, enabling the entire magnetic levitation motor to operate normally.

[0066] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A bearing structure, characterized in that, include: All three are annular upper and lower frames and an iron core. The upper and lower frames are axially connected. The iron core is disposed on the outer ring at the connection between the upper and lower frames. The upper frame has a first connecting part on the side facing the lower frame, and the lower frame has a second connecting part on the side facing the upper frame. The first connecting part, the second connecting part and the iron core are connected by a connector. The connector connects the first connecting part, the second connecting part, and the iron core in the radial direction of the bearing structure; the iron core is provided with an axially penetrating groove, and both the first connecting part and the second connecting part are located in the groove; The first connecting part and the second connecting part are respectively radially provided with a first connecting hole and a second connecting hole, and the side of the iron core is radially provided with a third connecting hole that penetrates the groove. The connector connects the first connecting hole, the second connecting hole and the third connecting hole.

2. The bearing structure according to claim 1, characterized in that, The first connecting part has a recessed portion at its end, and the second connecting part is inserted into the recessed portion; or, the second connecting part has a recessed portion at its end, and the first connecting part is inserted into the recessed portion.

3. The bearing structure according to claim 1, characterized in that, Multiple connectors are provided and are spaced apart circumferentially along the bearing structure.

4. The bearing structure according to claim 1, characterized in that, It also includes ring-shaped aluminum strips; The aluminum strip has an annular protrusion, and the bottom of the iron core has a corresponding annular groove, in which the annular protrusion is inserted; or, the bottom of the iron core has an annular protrusion, and the aluminum strip has a corresponding annular groove, in which the annular protrusion is inserted.

5. The bearing structure according to claim 4, characterized in that, The iron core includes an inner ring and an outer ring disposed around the outer periphery of the inner ring. The groove is disposed on the inner ring, and the annular groove or annular protrusion is disposed on the bottom of the outer ring.

6. The bearing structure according to claim 5, characterized in that, The bottom of the outer ring of the iron core extends outward relative to the inner ring of the iron core.

7. A magnetic levitation motor, comprising the bearing structure as described in any one of claims 1-6.

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