A magnetic bearing structure

Abstract

This invention provides a magnetic levitation bearing structure, including a rotor, a first iron core, and a second iron core. The rotor has a thrust plate. The first and second iron cores abut against each other, and a first groove is formed between the first and second iron cores. The thrust plate has a first side and a second side. The inner wall of the first groove has a third side and a fourth side. The first side has a first inclined surface, the second side has a second inclined surface, the third side has a third inclined surface, and the fourth side has a fourth inclined surface. A first permanent magnet group is disposed on the first inclined surface, a second permanent magnet group is disposed on the third inclined surface, a fourth permanent magnet group is disposed on the second inclined surface, and a third permanent magnet group is disposed on the fourth inclined surface. Repulsive forces are formed between the first and second permanent magnet groups, and between the third and fourth permanent magnet groups. According to this invention, the technical problem of excessive temperature in magnetic levitation bearings leading to winding damage in the prior art can be solved.

Description

Technical Field

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

[0002] The related technology discloses a hybrid magnetic levitation axial bearing structure with attraction and repulsion forces. The stator assembly includes an axial iron core, a first annular magnet, and a coil. The axial iron core has a first annular groove and a second annular groove. The first annular magnet is disposed in the first annular groove, and the coil is disposed in the second annular groove. The rotor assembly has a second annular magnet and a third annular magnet. The second annular magnet and the third annular magnet form repulsive forces with the first annular magnet in the axial and radial directions, respectively. When the coil is energized, an attraction force is generated between the rotor assembly and the stator assembly. However, it has the following disadvantages: the bearing has a large current, and when the rotor is levitated, the stator assembly needs to maintain a large current to attract the rotor to the middle. When the stator assembly maintains a large current, the temperature will continue to rise, and maintaining a high temperature for a long time will affect the life of the windings. The axial protection bearing has a large impact force, and when the rotor stops axially levitating, it will collide with the other end of the shaft under the repulsive force of the second and third magnetic components.

[0003] Because existing magnetic levitation bearings suffer from excessively high temperatures, leading to winding damage and other technical problems, this invention researches and designs a magnetic levitation bearing structure. Summary of the Invention

[0004] Therefore, the present invention provides a magnetic levitation bearing structure that can solve the technical problem of excessive temperature in existing magnetic levitation bearings leading to winding damage.

[0005] To address the aforementioned problems, this invention provides a magnetic levitation bearing structure, comprising: a rotor, a first iron core, and a second iron core. The rotor has a thrust plate. The first iron core and the second iron core abut against each other, and a first groove is formed between the first iron core and the second iron core. The opening of the first groove faces the rotor. The thrust plate extends at least partially into the first groove. Along the axial direction of the rotor, the thrust plate has a first side and a second side. The inner wall of the first groove has a third side and a fourth side. The first side has a first inclined surface, the second side has a second inclined surface, the third side has a third inclined surface, and the fourth side has a fourth inclined surface. The first inclined surface and the third inclined surface are arranged opposite to each other, and the second inclined surface and the fourth inclined surface are arranged opposite to each other. A first permanent magnet group is disposed on the first inclined surface, a second permanent magnet group is disposed on the third inclined surface, a fourth permanent magnet group is disposed on the second inclined surface, and a third permanent magnet group is disposed on the fourth inclined surface. Repulsive forces are formed between the first permanent magnet group and the second permanent magnet group, and between the third permanent magnet group and the fourth permanent magnet group.

[0006] In some embodiments, with the axial cross-section of the rotor as the projection plane, the first groove is formed by the third side, the fifth side and the fourth side connected in sequence. The third side and the fifth side are formed on the first iron core, and the fourth side is formed on the second iron core. The third side is connected to the fifth side through the third inclined surface, and the fourth side is connected to the fifth side through the fourth inclined surface. There is an angle between the third inclined surface and the central axis of the rotor, and between the fourth inclined surface and the central axis of the rotor, and the angle is 45 degrees.

[0007] In some embodiments, a sixth groove is provided on the fifth side, the side of the sixth groove near the second iron core penetrating the first iron core, and a winding is provided in the sixth groove.

[0008] In some embodiments, with the axial cross-section of the rotor as the projection plane, the thrust plate includes a first side, a sixth side, and a second side connected in sequence. The first side is connected to the sixth side through the first inclined surface, and the second side is connected to the sixth side through the second inclined surface. There is an angle of 45 degrees between the second inclined surface and the central axis of the rotor, and between the first inclined surface and the central axis of the rotor.

[0009] In some embodiments, a fourth groove is provided on the third inclined surface, and the second permanent magnet assembly is installed in the fourth groove; a fifth groove is provided on the first inclined surface, and the first permanent magnet assembly is installed in the fifth groove; a third groove is provided on the second inclined surface, and the fourth permanent magnet assembly is installed in the third groove; a second groove is provided on the fourth inclined surface, and the third permanent magnet assembly is installed in the second groove; the fifth groove and the fourth groove, and the third groove and the second groove are arranged opposite to each other.

[0010] In some embodiments, a first magnetic isolation ring is provided between the bottom of the fifth groove and the fourth groove and the second permanent magnet group; a second magnetic isolation ring is provided between the bottom of the fifth groove and the first permanent magnet group; a third magnetic isolation ring is provided between the bottom of the second groove and the third permanent magnet group; and a fourth magnetic isolation ring is provided between the bottom of the third groove and the fourth permanent magnet group.

[0011] In some embodiments, the first permanent magnet group includes a first permanent magnet, a second permanent magnet, and a third permanent magnet arranged sequentially along the width direction of the fifth groove, with the magnetic poles of the first permanent magnet and the third permanent magnet facing the second permanent magnet, and the magnetic poles of the second permanent magnet facing the second permanent magnet group;

[0012] The second permanent magnet group includes a fourth permanent magnet, a fifth permanent magnet, and a sixth permanent magnet arranged sequentially along the width direction of the fourth groove. The magnetic poles of the fourth permanent magnet and the sixth permanent magnet face the fifth permanent magnet, and the magnetic poles of the fifth permanent magnet face the first permanent magnet group.

[0013] In some embodiments, the third permanent magnet group includes a seventh permanent magnet, an eighth permanent magnet, and a ninth permanent magnet arranged sequentially along the width of the second groove, with the magnetic poles of the seventh permanent magnet and the ninth permanent magnet facing the eighth permanent magnet, and the magnetic poles of the eighth permanent magnet facing the fourth permanent magnet group;

[0014] The fourth permanent magnet group includes a tenth permanent magnet, an eleventh permanent magnet, and a twelfth permanent magnet arranged sequentially along the width of the third groove. The magnetic poles of the tenth permanent magnet and the twelfth permanent magnet face the eleventh permanent magnet, and the magnetic poles of the eleventh permanent magnet face the third permanent magnet group.

[0015] In some embodiments, a shoulder is formed at one end of the first side and the second side near the rotor, a first bearing is provided between the first iron core and the rotor, a first pressure cap is provided on the first iron core, and the first bearing is located between the first pressure cap and the shoulder.

[0016] In some embodiments, a second bearing is provided between the second iron core and the rotor, a second pressure cap is provided on the second iron core, and the second bearing is located between the first pressure cap and the shaft shoulder.

[0017] The magnetic levitation bearing structure provided by this invention has the following beneficial effects:

[0018] The first, second, third, and fourth permanent magnet groups provide radial and axial forces to the magnetic levitation bearing, thereby reducing the number of turns of the coil in the magnetic levitation bearing, decreasing the radial and axial current of the magnetic levitation bearing, and lowering the temperature of the magnetic levitation bearing, thus protecting the winding. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 This is an assembly structure diagram of the magnetic levitation bearing structure of the present invention;

[0021] Figure 2 This is a partial enlargement of the magnetic levitation bearing structure of the present invention. Figure 1 ;

[0022] Figure 3 This is a schematic diagram of the permanent magnet assembly in the magnetic levitation bearing structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the magnetic circuit of the magnetic levitation bearing structure of the present invention;

[0024] Figure 5 This is a partial enlargement of the magnetic levitation bearing structure of the present invention. Figure 2 ;

[0025] Figure 6 This is a partial enlargement of the magnetic levitation bearing structure of the present invention. Figure 3 .

[0026] The attached figures are labeled as follows:

[0027] 1. Rotor; 2. First iron core; 3. Second iron core; 4. First pressure cap; 5. First bearing; 6. First permanent magnet group; 6.1. First permanent magnet; 6.2. Second permanent magnet; 6.3. Third permanent magnet; 7. Second permanent magnet group; 7.1. Fourth permanent magnet; 7.2. Fifth permanent magnet; 7.3. Sixth permanent magnet; 8. Third permanent magnet group; 8.1. Seventh permanent magnet; 8.2. Eighth permanent magnet; 8.3. Ninth permanent magnet; 9. Fourth permanent magnet group; 9.1. Tenth permanent magnet; 9.2. Eleventh permanent magnet; 9.3. Twelfth permanent magnet; 10. Second bearing; 11. Second pressure cap; 12. Winding; 13. Control 14. Magnetizing circuit; 15. First auxiliary magnetic circuit; 16. Second auxiliary magnetic circuit; 17. First magnetic isolation ring; 18. Second magnetic isolation ring; 19. Third magnetic isolation ring; 10. Fourth magnetic isolation ring; 21. First gap; 22. Second gap; 23. Third gap; 24. Fourth gap; 25. Thrust plate; 26. First groove; 27. Second side; 28. Third side; 29. ​​Fourth side; 30. First inclined surface; 31. Second inclined surface; 32. Third inclined surface; 33. Fourth inclined surface; 34. Sixth side; 35. Second groove; 36. Third groove; 37. Fourth groove; 38. Fifth groove; 39. Sixth groove. Detailed Implementation

[0028] 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 embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0029] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0030] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0032] See also Figure 1-6As shown, according to an embodiment of the present invention, a magnetic levitation bearing structure is provided, including: a rotor 1, a first iron core 2, and a second iron core 3. The rotor 1 has a thrust plate 24. The first iron core 2 and the second iron core 3 abut against each other, and a first groove 25 is formed between the first iron core 2 and the second iron core 3. The opening of the first groove 25 faces the rotor 1. The thrust plate 24 extends at least partially into the first groove 25. Along the axial direction of the rotor 1, the thrust plate 24 has a first side 26 and a second side 27. The inner wall of the first groove 25 has a third side 28 and a fourth side 29. The first side 26 has a first inclined surface 30, and the second... Side 27 has a second inclined surface 31, the third side 28 has a third inclined surface 32, and the fourth side 29 has a fourth inclined surface 33. The first inclined surface 30 and the third inclined surface 32 are arranged opposite to each other, the second inclined surface 31 and the fourth inclined surface 33 are arranged opposite to each other, a first permanent magnet group 6 is provided on the first inclined surface 30, a second permanent magnet group 7 is provided on the third inclined surface 32, a fourth permanent magnet group 9 is provided on the second inclined surface 31, and a third permanent magnet group 8 is provided on the fourth inclined surface 33. Repulsive forces are formed between the first permanent magnet group 6 and the second permanent magnet group 7, and between the third permanent magnet group 8 and the fourth permanent magnet group 9.

[0033] In this technical solution, the first permanent magnet group 6, the second permanent magnet group 7, the third permanent magnet group 8 and the fourth permanent magnet group 9 provide radial and axial forces to the magnetic levitation bearing, thereby reducing the number of turns of the coil in the magnetic levitation bearing, reducing the radial and axial current of the magnetic levitation bearing, and lowering the temperature of the magnetic levitation bearing, thus protecting the winding.

[0034] In some embodiments, a first auxiliary magnetic circuit 14 is formed between the first permanent magnet group 6 and the second permanent magnet group 7, a second auxiliary magnetic circuit 15 is formed between the third permanent magnet group 8 and the fourth permanent magnet group 9, and a control magnetic circuit 13 is formed between the first iron core 2, the second iron core 3 and the thrust plate 24.

[0035] In some embodiments, with the axial cross-section of the rotor 1 as the projection plane, the first groove 25 is formed by the third side 28, the fifth side and the fourth side 29 connected in sequence. The third side 28 and the fifth side are formed on the first iron core 2, and the fourth side 29 is formed on the second iron core 3. The third side 28 is connected to the fifth side through the third inclined surface 32, and the fourth side 29 is connected to the fifth side through the fourth inclined surface 33. The third inclined surface 32 and the central axis of the rotor 1, and the fourth inclined surface 33 and the central axis of the rotor 1 have an angle of 45 degrees.

[0036] In this technical solution, there is an angle between the third inclined surface 32 and the central axis of the rotor 1, and between the fourth inclined surface 33 and the central axis of the rotor 1. The angle is 45 degrees, so that the permanent magnet group 7 and the third permanent magnet group 8 simultaneously generate radial and axial passive magnetic forces to provide magnetic force for the magnetic levitation bearing.

[0037] In some embodiments, a sixth groove 39 is provided on the fifth side, the side of the sixth groove 39 near the second iron core 3 penetrates the first iron core 2, and a winding 12 is provided in the sixth groove 39.

[0038] In this technical solution, a winding 12 is provided in the sixth groove 39 to form a control magnetic circuit 12, thereby achieving precise control of the magnetic levitation bearing.

[0039] The magnetic levitation bearing structure of this invention reduces the active force of the radial and axial magnetic levitation bearings under the auxiliary passive repulsive force provided by the permanent magnets, thereby reducing the number of coil turns and lowering the bearing coil temperature. The use of a segmented matrix of permanent magnets provides both passive levitation force and an axial auxiliary magnetic circuit. This reduces the axial impact force on the protective bearing when it is suspended, thus improving the lifespan and reliability of the axial protective bearing.

[0040] In some embodiments, with the axial cross-section of the rotor 1 as the projection plane, the thrust plate 24 includes a first side 26, a sixth side 34 and a second side 27 connected in sequence. The first side 26 is connected to the sixth side 34 through the first inclined surface 30, and the second side 27 is connected to the sixth side 34 through the second inclined surface 31. There is an angle between the second inclined surface 31 and the central axis of the rotor 1, and between the first inclined surface 30 and the central axis of the rotor 1, and the angle is 45 degrees.

[0041] In this technical solution, there is an angle between the second inclined surface 31 and the central axis of the rotor 1, and between the first inclined surface 30 and the central axis of the rotor 1. The angle is 45 degrees, so that the permanent magnet group 6 and the fourth permanent magnet group 9 simultaneously generate radial and axial passive magnetic forces to provide magnetic force for the magnetic levitation bearing.

[0042] In some embodiments, a fourth groove 37 is provided on the third inclined surface 32, and the second permanent magnet group 7 is installed in the fourth groove 37; a fifth groove 38 is provided on the first inclined surface 30, and the first permanent magnet group 6 is installed in the fifth groove 38; a third groove 36 is provided on the second inclined surface 31, and the fourth permanent magnet group 9 is installed in the third groove 36; a second groove 35 is provided on the fourth inclined surface 33, and the third permanent magnet group 8 is installed in the second groove 35; the fifth groove 38 and the fourth groove 37, and the third groove 36 and the second groove 35 are arranged opposite to each other.

[0043] In this technical solution, the permanent magnet assembly is fixed by the five grooves 38, the fourth groove 37, the third groove 36, and the second groove 35, which ensures the magnetic field stability between the permanent magnet assemblies.

[0044] The magnetic levitation bearing structure of this invention features permanent magnets mounted at 45° angles on the front and rear axial iron cores and the rotor thrust disk, simultaneously generating radial and axial passive magnetic forces. Employing a segmented matrix of permanent magnets, it generates passive magnetic forces while providing an auxiliary magnetic circuit for the axial bearing, requiring only one coil to generate the necessary axial force.

[0045] In some embodiments, a first magnetic isolation ring 16 is provided between the bottom of the fifth groove 38 and the fourth groove 37 and the second permanent magnet group 7; a second magnetic isolation ring 17 is provided between the bottom of the fifth groove 38 and the first permanent magnet group 6; a third magnetic isolation ring 18 is provided between the bottom of the second groove 35 and the third permanent magnet group 8; and a fourth magnetic isolation ring 19 is provided between the bottom of the third groove 36 and the fourth permanent magnet group 9.

[0046] In this technical solution, the magnetic leakage of the permanent magnet group is avoided by setting the magnetic isolation ring, and the magnetic field density of the auxiliary magnetic circuit between the permanent magnet groups is increased.

[0047] The magnetic levitation bearing structure of the present invention solves the problems of large current in the bearing caused by large output force when the rotor is suspended in the radial and axial directions, high temperature during long-term operation, and large impact force on the axial protection bearing when the rotor stops levitation in the axial direction.

[0048] In some embodiments, the first permanent magnet group 6 includes a first permanent magnet 6.1, a second permanent magnet 6.2 and a third permanent magnet 6.3 arranged sequentially along the width direction of the fifth groove 38, with the magnetic poles of the first permanent magnet 6.1 and the third permanent magnet 6.3 facing the second permanent magnet 6.2, and the magnetic poles of the second permanent magnet 6.2 facing the second permanent magnet group 7;

[0049] The second permanent magnet group 7 includes a fourth permanent magnet 7.1, a fifth permanent magnet 7.2, and a sixth permanent magnet 7.3 arranged sequentially along the width direction of the fourth groove 37. The magnetic poles of the fourth permanent magnet 7.1 and the sixth permanent magnet 7.3 face the fifth permanent magnet 7.2, and the magnetic pole of the fifth permanent magnet 7.2 faces the first permanent magnet group 6.

[0050] In this technical solution, the second permanent magnet group 7 and the first permanent magnet group 6 adopt block matrix permanent magnets, which generate passive magnetic force while providing an auxiliary magnetic circuit for the axial bearing. The axial bearing only needs one coil to generate the required axial force.

[0051] In some embodiments, the third permanent magnet group 8 includes a seventh permanent magnet 8.1, an eighth permanent magnet 8.2, and a ninth permanent magnet 8.3 arranged sequentially along the width direction of the second groove 35, with the magnetic poles of the seventh permanent magnet 8.1 and the ninth permanent magnet 8.3 facing the eighth permanent magnet 8.2, and the magnetic pole of the eighth permanent magnet 8.2 facing the fourth permanent magnet group 9;

[0052] The fourth permanent magnet group 9 includes a tenth permanent magnet 9.1, an eleventh permanent magnet 9.2, and a twelfth permanent magnet 9.3 arranged sequentially along the width direction of the third groove 36. The magnetic poles of the tenth permanent magnet 9.1 and the twelfth permanent magnet 9.3 face the eleventh permanent magnet 9.2, and the magnetic pole of the eleventh permanent magnet 9.2 faces the third permanent magnet group 8.

[0053] In this technical solution, the fourth permanent magnet group 9 and the third permanent magnet group 8 adopt block matrix permanent magnets, which generate passive magnetic force and provide auxiliary magnetic circuit for the axial bearing. The axial bearing only needs one coil to generate the required axial force.

[0054] It should be noted that the magnetic pole direction of the magnetic levitation bearing structure of the present invention is not limited to N or S, but when the magnetic pole direction is N, the arrow direction of the 12 permanent magnets must be N.

[0055] In some embodiments, the first side 26 and the second side 27 are provided with a shoulder at one end near the rotor 1, a first bearing 5 is provided between the first iron core 2 and the rotor 1, a first pressure cover 4 is provided on the first iron core 2, and the first bearing 5 is located between the first pressure cover 4 and the shoulder.

[0056] In some embodiments, a second bearing 10 is provided between the second iron core 3 and the rotor 1, a second pressure cap 11 is provided on the second iron core 3, and the second bearing 10 is located between the first pressure cap 4 and the shaft shoulder.

[0057] In this technical solution, the first bearing 5 and the second bearing 10 serve as protective bearings to provide radial and axial protection for the first iron core 2 and the second iron core 3.

[0058] It should be noted that there is a gap between the inner wall of the protective bearing and the shaft, so that it does not come into contact with the shaft after the rotor is suspended.

[0059] The first bearing 5 has a first gap 20 with the shoulder, the first iron core 2 has a second gap 21 with the thrust plate 24, the second iron core 3 has a fourth gap 23 with the thrust plate 24, and the second bearing 10 has a third gap 22 with the shoulder.

[0060] The magnetic levitation bearing structure control logic of this invention involves the first permanent magnet group 6 and the second permanent magnet group 7, and the third permanent magnet group 8 and the fourth permanent magnet group 9 generating a first permanent magnet auxiliary magnetic circuit 14 and a second permanent magnet auxiliary magnetic circuit 15. After the winding 12 is energized, a counterclockwise control magnetic circuit 13 is generated. The control magnetic circuit 13 and the first permanent magnet auxiliary magnetic circuit 14 have the same direction at the left axial air gap, both pointing to the right. The magnetic fields superimpose, increasing the air gap magnetic flux density. At the right axial air gap, the control magnetic circuit 13 and the second permanent magnet auxiliary magnetic circuit 15 have opposite directions; the second permanent magnet auxiliary magnetic circuit 15 points to the left, and the control magnetic circuit 13 points to the right. The magnetic fields cancel each other out, decreasing the air gap magnetic flux density. This generates an attractive force in the left axial air gap, causing the rotor to move to the left. Similarly, changing the current direction in the winding 12 will generate a magnetic circuit opposite to the control magnetic circuit 13. In this case, the magnetic circuits superimpose in the right air gap and cancel each other out in the left air gap, generating an attractive force in the right air gap, causing the rotor to move to the right. By controlling the direction of the current in winding 12, the required axial force can be generated, causing the rotor to suspend at the desired center position.

[0061] When the winding 12 is de-energized, the rotor 1 stops levitation. When the rotor 1 stops levitation, it will move forward axially. The first bearing 5 is arranged on the first iron core 2. Since the first axial gap 20 between the first bearing 5 and the rotor 1 is smaller than the second gap 21, when the rotor 1 moves forward, it will first contact the first bearing 5 to prevent the thrust plate from colliding with the first iron core 2. The second permanent magnet group 7 and the first permanent magnet group 6 on the first iron core 2 generate repulsive force to reduce the axial and radial impact force.

[0062] Similarly, when the rotor 1 stops suspending, it will move axially backward. The second bearing 10 arranged on the second iron core 3 has a smaller axial third clearance 22 between the second bearing 10 and the rotor 1 than the fourth clearance 23. When the rotor 1 moves forward, it will first contact the second bearing 10 to prevent the thrust plate from colliding with the second iron core 3. The third permanent magnet group 8 and the fourth permanent magnet group 9 on the second iron core 3 generate repulsive force to reduce axial and radial impact force.

[0063] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A magnetic levitation bearing structure, characterized in that: include: The rotor (1), the first iron core (2), and the second iron core (3) are provided. The rotor (1) has a thrust plate (24). The first iron core (2) and the second iron core (3) abut against each other, and a first groove (25) is formed between the first iron core (2) and the second iron core (3). The opening of the first groove (25) faces the rotor (1). The thrust plate (24) extends at least partially into the first groove (25). Along the axial direction of the rotor (1), the thrust plate (24) has a first side (26) and a second side (27). The inner wall of the first groove (25) has a third side (28). The first side (26) has a first inclined surface (30), the second side (27) has a second inclined surface (31), the third side (28) has a third inclined surface (32), and the fourth side (29) has a fourth inclined surface (33). The first inclined surface (30) and the third inclined surface (32) are arranged opposite to each other, and the second inclined surface (31) and the fourth inclined surface (33) are arranged opposite to each other. A first permanent magnet group (6) is provided on the first inclined surface (30), a second permanent magnet group (7) is provided on the third inclined surface (32), and a second permanent magnet group (7) is provided on the second inclined surface (31). A fourth permanent magnet group (9) is provided, and a third permanent magnet group (8) is provided on the fourth inclined surface (33). A repulsive force is formed between the first permanent magnet group (6) and the second permanent magnet group (7), and between the third permanent magnet group (8) and the fourth permanent magnet group (9). Taking the axial section of the rotor (1) as the projection plane, the first groove (25) is formed by the third side (28), the fifth side and the fourth side (29) connected in sequence. The third side (28) and the fifth side are formed on the first iron core (2), and the fourth side (29) is formed on the second iron core (3). (28) The fifth side is connected through the third inclined surface (32), and the fourth side (29) is connected through the fourth inclined surface (33). There is an angle between the third inclined surface (32) and the central axis of the rotor (1), and between the fourth inclined surface (33) and the central axis of the rotor (1). The angle is 45 degrees. The fifth side is provided with a sixth groove (39). The sixth groove (39) passes through the first iron core (2) on the side near the second iron core (3). A winding (12) is provided in the sixth groove (39) to form a control magnetic circuit (13).

2. The magnetic levitation bearing structure according to claim 1, characterized in that: With the axial cross section of the rotor (1) as the projection plane, the thrust plate (24) includes a first side (26), a sixth side (34) and a second side (27) connected in sequence. The first side (26) is connected to the sixth side (34) through the first inclined surface (30), and the second side (27) is connected to the sixth side (34) through the second inclined surface (31). There is an angle between the second inclined surface (31) and the central axis of the rotor (1), and between the first inclined surface (30) and the central axis of the rotor (1), and the angle is 45 degrees.

3. The magnetic levitation bearing structure according to claim 1, characterized in that: A fourth groove (37) is provided on the third inclined surface (32), and the second permanent magnet group (7) is installed in the fourth groove (37). A fifth groove (38) is provided on the first inclined surface (30), and the first permanent magnet group (6) is installed in the fifth groove (38). A third groove (36) is provided on the second inclined surface (31), and the fourth permanent magnet group (9) is installed in the third groove (36). A second groove (35) is provided on the fourth inclined surface (33), and the third permanent magnet group (8) is installed in the second groove (35). The fifth groove (38) is arranged opposite to the fourth groove (37), and the third groove (36) is arranged opposite to the second groove (35).

4. The magnetic levitation bearing structure according to claim 3, characterized in that: A first magnetic isolation ring (16) is provided between the bottom of the fifth groove (38) and the fourth groove (37) and the second permanent magnet group (7). A second magnetic isolation ring (17) is provided between the bottom of the fifth groove (38) and the first permanent magnet group (6). A third magnetic isolation ring (18) is provided between the bottom of the second groove (35) and the third permanent magnet group (8). A fourth magnetic isolation ring (19) is provided between the bottom of the third groove (36) and the fourth permanent magnet group (9).

5. The magnetic levitation bearing structure according to claim 3, characterized in that: The first permanent magnet group (6) includes a first permanent magnet (6.1), a second permanent magnet (6.2) and a third permanent magnet (6.3) arranged sequentially along the width direction of the fifth groove (38). The magnetic poles of the first permanent magnet (6.1) and the third permanent magnet (6.3) face the second permanent magnet (6.2), and the magnetic poles of the second permanent magnet (6.2) face the second permanent magnet group (7). The second permanent magnet group (7) includes a fourth permanent magnet (7.1), a fifth permanent magnet (7.2) and a sixth permanent magnet (7.3) arranged sequentially along the width direction of the fourth groove (37). The magnetic poles of the fourth permanent magnet (7.1) and the sixth permanent magnet (7.3) are oriented toward the fifth permanent magnet (7.2), and the magnetic poles of the fifth permanent magnet (7.2) are oriented toward the first permanent magnet group (6).

6. The magnetic levitation bearing structure according to claim 3, characterized in that: The third permanent magnet group (8) includes a seventh permanent magnet (8.1), an eighth permanent magnet (8.2) and a ninth permanent magnet (8.3) arranged sequentially along the width direction of the second groove (35). The magnetic poles of the seventh permanent magnet (8.1) and the ninth permanent magnet (8.3) are oriented toward the eighth permanent magnet (8.2), and the magnetic poles of the eighth permanent magnet (8.2) are oriented toward the fourth permanent magnet group (9). The fourth permanent magnet group (9) includes a tenth permanent magnet (9.1), an eleventh permanent magnet (9.2) and a twelfth permanent magnet (9.3) arranged sequentially along the width direction of the third groove (36). The magnetic poles of the tenth permanent magnet (9.1) and the twelfth permanent magnet (9.3) are oriented toward the eleventh permanent magnet (9.2), and the magnetic poles of the eleventh permanent magnet (9.2) are oriented toward the third permanent magnet group (8).

7. The magnetic levitation bearing structure according to claim 1, characterized in that: Shoulders are formed at the ends of the first side (26) and the second side (27) near the rotor (1). A first bearing (5) is provided between the first iron core (2) and the rotor (1). A first pressure cap (4) is provided on the first iron core (2). The first bearing (5) is located between the first pressure cap (4) and the shoulder.

8. The magnetic levitation bearing structure according to claim 7, characterized in that: A second bearing (10) is provided between the second iron core (3) and the rotor (1), and a second pressure cap (11) is provided on the second iron core (3). The second bearing (10) is located between the first pressure cap (4) and the shaft shoulder.

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