Axial magnetic bearings, motors

Abstract

The present invention provides an axial magnetic bearing and a motor, wherein the axial magnetic bearing comprises two core assemblies, which are arranged relatively parallel to each other and form an installation gap, wherein a thrust plate connected to a rotor is provided in the installation gap, and a rolling body is provided in the first end face of the core of the core assembly facing the thrust plate, wherein the rolling body has a portion protruding from the first end face. According to the present invention, on the one hand, the rolling body provided on the first end face of the core can convert the sliding friction between the thrust plate and the core into rolling friction when the bearing suspension is unstable or the magnetic suspension system is powered off, thereby effectively avoiding damage to the thrust plate and reducing costs; on the other hand, the axial protection structure of the rotor is integrated into the axial magnetic bearing, which makes the structure simpler and can also help shorten the axial length of the rotor, reduce the weight of the rotor, and thus reduce the energy consumption of the motor.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetic suspension bearing manufacturing, and in particular relates to an axial magnetic suspension bearing and a motor. Background Art

[0002] Magnetic bearings use controllable electromagnetic force to suspend the rotor in a magnetic field. Compared with ordinary bearings, they have the advantages of non-contact, no lubrication, no wear, long service life, low maintenance costs, and no need for lubrication and sealing. They can be used in special environments such as vacuum technology, clean rooms and sterile workshops, and the transportation of corrosive media or very pure media.

[0003] Magnetic levitation allows for high-speed, high-precision operation. However, if a magnetic bearing suddenly loses power or fails during operation, the rotor will fall at high speed, severely damaging both the rotor and the magnetic bearing. Therefore, magnetic bearing systems typically incorporate protective devices, including radial and axial protection. Radial protection typically utilizes ball bearings, while axial protection typically employs graphite or other ball bearings. However, existing technologies employ an axial protection mechanism independent of the axial magnetic bearing. This inevitably increases the rotor's length, weight, and energy consumption. Summary of the Invention

[0004] Therefore, the present invention provides an axial magnetic suspension bearing and a motor, which can overcome the shortcomings of the related art in which the axial protection structure is set independently from the axial magnetic suspension bearing, resulting in a longer rotor length, increased rotor weight, and higher motor energy consumption.

[0005] In order to solve the above problems, the present invention provides an axial magnetic levitation bearing, comprising two core assemblies, which are arranged relatively parallel to each other and form an installation gap. A thrust plate connected to the rotor is provided in the installation gap. A rolling body is provided in the first end face of the core in the core assembly facing the thrust plate, and the rolling body has a portion protruding from the first end face.

[0006] In some embodiments, a first annular raceway is configured on the first end surface, the first annular raceway accommodates a plurality of the rolling elements, and a cross-section of the first annular raceway is a major arc.

[0007] In some embodiments, the iron core includes an outer ring body and a coil embedded ring body, the outer ring body is coaxially mounted on the outer circumferential side of the coil embedded ring body, and the inner side of the side wall of one end of the outer ring body corresponding to the first end face is constructed with a first inner ring arc groove, and the outer side of the side wall of one end of the coil embedded ring body corresponding to the first end face is constructed with a first outer ring arc groove, and the first inner ring arc groove and the first outer ring arc groove together form the first circular raceway.

[0008] In some embodiments, the outer ring body includes at least two outer ring sub-bodies, and the at least two outer ring sub-bodies can be assembled into a full circle to form the outer ring body.

[0009] In some embodiments, a second annular raceway is further configured on the first end surface, wherein the second annular raceway accommodates a plurality of the rolling elements, and a cross section of the second annular raceway is a major arc.

[0010] In some embodiments, the iron core also includes an inner ring body, which is coaxially mounted on the inner circumference of the coil embedded ring body, and a second inner ring arc groove is constructed on the inner side of the side wall of one end of the coil embedded ring body corresponding to the first end face, and a second outer ring arc groove is constructed on the outer side of the side wall of one end of the inner ring body corresponding to the first end face, and the second inner ring arc groove and the second outer ring arc groove together form the second circular raceway.

[0011] In some embodiments, the inner ring body includes at least two inner ring sub-bodies, and the at least two inner ring sub-bodies can be assembled into a full circle to form the inner ring body.

[0012] In some embodiments, a third annular raceway is constructed on the inner ring wall of the inner ring body, the third annular raceway accommodates a plurality of the rolling elements, and the cross section of the third annular raceway is a major arc.

[0013] In some embodiments, the inner circumferential wall of the inner ring body has a protruding ring extending radially inward and an axial limiting ring assembled with the axial end face of the protruding ring, the protruding ring is configured with a first end face groove on the side facing the axial limiting ring, and the axial limiting ring is configured with a second end face groove on the side facing the protruding ring, and the first end face groove and the second end face groove together form the third circular ring raceway.

[0014] In some embodiments, the outer ring body, the coil embedded ring body, and the inner ring body are bonded to each other; and / or the axial limiting ring and the convex ring are bonded to each other.

[0015] The present invention also provides a motor comprising the above-mentioned axial magnetic suspension bearing.

[0016] The present invention provides an axial magnetic levitation bearing and motor. On the one hand, the rolling body provided on the first end face of the iron core can convert the sliding friction between the thrust plate and the iron core into rolling friction when the bearing suspension is unstable or the magnetic levitation system is powered off, thereby effectively avoiding damage to the thrust plate and reducing costs. On the other hand, the axial protection structure of the rotor is integrated into the axial magnetic levitation bearing, which has a simpler structure and can also help shorten the axial length of the rotor, reduce the weight of the rotor, and thus reduce the energy consumption of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the internal structure of an axial magnetic bearing according to an embodiment of the present invention (half-section);

[0018] Figure 2 for Figure 1 Exploded view of the axial magnetic bearing;

[0019] Figure 3 for Figure 1 Half-section view of the middle part;

[0020] Figure 4 for Figure 3 Exploded diagram of .

[0021] The reference numerals indicate:

[0022] 1. Iron core; 11. Outer ring; 12. Coil-embedded ring; 13. Inner ring; 131. Protruding ring; 132. Axial limit ring; 2. Coil; 3. Rotor; 4. Thrust plate; 5. Rolling element; 7. Housing. DETAILED DESCRIPTION

[0023] See also Figures 1 to 4 As shown, according to an embodiment of the present invention, an axial magnetic bearing is provided, comprising two core assemblies arranged parallel to each other and forming a mounting gap. A thrust plate 4 connected to a rotor 3 is disposed within the mounting gap. Rolling elements 5 (e.g., balls) are disposed within the first end surface of the core 1 of the core assembly facing the thrust plate 4. The rolling elements 5 have a portion protruding from the first end surface. In this technical solution, on the one hand, the rolling elements 5 disposed on the first end surface of the core 1 can convert sliding friction between the thrust plate 4 and the core 1 into rolling friction when the bearing suspension is unstable or the magnetic suspension system is powered off, effectively preventing damage to the thrust plate 4 and reducing costs. On the other hand, the axial protection structure of the rotor 3 is integrated into the axial magnetic bearing, simplifying the structure while also shortening the axial length of the rotor 3 (eliminating the need for a separate axial protection device that would otherwise occupy rotor length), reducing the weight of the rotor 3, and thereby lowering motor energy consumption.

[0024] In some embodiments, a first annular raceway is constructed on the first end face, accommodating a plurality of rolling elements 5. The cross-section of the first annular raceway is a major arc. As will be appreciated, the plurality of rolling elements 5 adjacent to each other within the first annular raceway will be able to roll when their protruding portions contact the rotating thrust plate 4, thereby converting sliding friction into rolling friction and effectively reducing wear on the contacting components. The major arc shape of the first annular raceway effectively prevents the rolling elements 5 from dislodging therefrom, ensuring that the rolling elements 5 remain securely within the first annular raceway.

[0025] In some embodiments, the iron core 1 is an integrated structure, and the first annular raceway is constructed on its first end face. At this time, in order to ensure that the rolling body 5 can be smoothly assembled in the first annular raceway, a corresponding rolling body embedding hole should be constructed on the first annular raceway. The multiple rolling bodies 5 are sequentially inserted through the rolling body embedding holes, and after the insertion is completed, the rolling body embedding holes can be sealed with a sealing piece (such as a nut).

[0026] In some embodiments, the iron core 1 includes an outer ring body 11 and a coil embedded ring body 12 (for winding the coil 2). The outer ring body 11 is coaxially mounted on the outer circumference of the coil embedded ring body 12, and the inner side of the side wall of the outer ring body 11 corresponding to the first end face is configured with a first inner ring arc groove, and the outer side of the side wall of the coil embedded ring body 12 corresponding to the first end face is configured with a first outer ring arc groove. The first inner ring arc groove and the first outer ring arc groove together form the first annular raceway. At this time, the rolling body 5 The embedding method can adopt the rolling element embedding hole mentioned above, and as another better implementation method, the outer ring body 11 includes at least two outer ring sub-bodies, and at least two of the outer ring sub-bodies can be assembled in a whole circle to form the outer ring body 11. The split outer ring body 11 makes the assembly of the rolling element 5 more convenient. It is only necessary to place a predetermined number of the rolling elements 5 in the first outer ring arc groove or the first inner ring arc groove in sequence in advance, and then assemble at least two of the outer ring sub-bodies to the outer circumferential wall of the coil embedding ring body 12. It can be understood that the axial magnetic levitation bearing has a shell 7, and the axial ends of the shell 7 respectively have iron core mounting holes, and the at least two outer ring sub-bodies of the outer ring body 11 are reliably assembled through the hole wall of the iron core mounting hole.

[0027] In some embodiments, a second annular raceway is further constructed on the first end face, and the second annular raceway accommodates a plurality of the rolling elements 5, and the cross-section of the second annular raceway is a major arc. The second annular raceway is preferably coaxially arranged with the first annular raceway, and together with the first annular raceway, it forms axial protection for the axial magnetic bearing.

[0028] Similar to the construction of the first annular raceway, the iron core 1 also includes an inner ring body 13, which is coaxially mounted on the inner circumference of the coil-embedded ring body 12. A second inner ring arc groove is constructed on the inner side of the side wall of the coil-embedded ring body 12 corresponding to the first end face, and a second outer ring arc groove is constructed on the outer side of the side wall of the inner ring body 13 corresponding to the first end face. The second inner ring arc groove and the second outer ring arc groove together form the second annular raceway. Furthermore, the inner ring body 13 includes at least two inner ring sub-bodies, and the at least two inner ring sub-bodies can be assembled into a full circle to form the inner ring body 13.

[0029] In some embodiments, a third annular raceway is constructed on the inner ring wall of the inner ring body 13, and a plurality of the rolling elements 5 are accommodated in the third annular raceway, and the cross-section of the third annular raceway is a major arc. It can be understood that the third annular raceway has a radial opening toward the rotor 3, and the rolling elements 5 can form radial protection for the axial magnetic bearing. In some embodiments, the inner circumferential wall of the inner ring body 13 has a convex ring 131 extending toward its radial inner side and an axial limit ring 132 assembled with the axial end face of the convex ring 131, the convex ring 131 is constructed with a first end face groove on the side facing the axial limit ring 132, and the axial limit ring 132 is constructed with a second end face groove on the side facing the convex ring 131, and the first end face groove and the second end face groove together form the third annular raceway.

[0030] In some embodiments, the outer ring body 11, the coil-embedded ring body 12, and the inner ring body 13 are bonded together; and / or the axial stop ring 132 and the protruding ring 131 are bonded together to facilitate assembly. Alternatively, screws, bolts, pins, interference fit heat assembly, welding, and the like may be used. The thrust plate 4 and the rotor 3 may also be connected using screws, bolts, pins, interference fit heat assembly, welding, or adhesive.

[0031] According to an embodiment of the present invention, there is further provided a motor comprising the above-mentioned axial magnetic bearing.

[0032] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0033] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. An axial magnetic suspension bearing for forming magnetic suspension for a rotor (3), characterized in that: The invention comprises two core assemblies, which are arranged in parallel with each other and form an installation gap. A thrust plate (4) connected to a rotor (3) is provided in the installation gap. A first annular raceway is constructed in the first end face of the core (1) in the core assembly facing the thrust plate (4). A plurality of rolling bodies (5) are accommodated in the first annular raceway, and the cross section of the first annular raceway is a major arc. The rolling body (5) has a portion protruding from the first end face, and can convert the sliding friction between the thrust plate (4) and the core (1) into rolling friction when the bearing suspension is unstable or the magnetic suspension system is powered off. Effectively avoid damage to the thrust plate (4); the iron core (1) includes an outer ring body (11) and a coil embedded ring body (12), the outer ring body (11) is coaxially sleeved on the outer circumference side of the coil embedded ring body (12), the iron core (1) also includes an inner ring body (13), the inner ring body (13) is coaxially sleeved on the inner circumference side of the coil embedded ring body (12), a third annular raceway is constructed on the inner ring wall of the inner ring body (13), a plurality of rolling bodies (5) are accommodated in the third annular raceway, and the cross section of the third annular raceway is an excellent arc, which can form radial protection for the axial magnetic suspension bearing.

2. The axial magnetic bearing according to claim 1, characterized in that: A first inner ring arc groove is constructed on the inner side of a side wall of one end of the outer ring body (11) corresponding to the first end face, and a first outer ring arc groove is constructed on the outer side of a side wall of one end of the coil embedded ring body (12) corresponding to the first end face. The first inner ring arc groove and the first outer ring arc groove together form the first circular ring raceway.

3. The axial magnetic bearing according to claim 2, characterized in that: The outer ring body (11) comprises at least two outer ring sub-bodies, and the at least two outer ring sub-bodies can be assembled in a full circle to form the outer ring body (11).

4. The axial magnetic bearing according to claim 2, characterized in that: A second annular raceway is also constructed on the first end face, wherein the second annular raceway accommodates a plurality of rolling bodies (5), and the cross section of the second annular raceway is a major arc.

5. The axial magnetic bearing according to claim 4, characterized in that: A second inner ring arc groove is constructed on the inner side of a side wall of one end of the coil embedded ring body (12) corresponding to the first end face, and a second outer ring arc groove is constructed on the outer side of a side wall of one end of the inner ring body (13) corresponding to the first end face. The second inner ring arc groove and the second outer ring arc groove together form the second circular ring raceway.

6. The axial magnetic bearing according to claim 5, characterized in that: The inner ring body (13) comprises at least two inner ring sub-bodies, and the at least two inner ring sub-bodies can be assembled in a full circle to form the inner ring body (13).

7. The axial magnetic bearing according to claim 6, characterized in that: The inner circumferential wall of the inner ring body (13) is provided with a convex ring (131) extending radially inward and an axial limiting ring (132) assembled with the axial end face of the convex ring (131), the convex ring (131) is provided with a first end face groove on the side facing the axial limiting ring (132), and the axial limiting ring (132) is provided with a second end face groove on the side facing the convex ring (131), and the first end face groove and the second end face groove together form the third annular raceway.

8. The axial magnetic bearing according to claim 7, characterized in that: The outer ring body (11), the coil embedded ring body (12), and the inner ring body (13) are bonded to each other; and / or the axial limiting ring (132) and the convex ring (131) are bonded to each other.

9. A motor, characterized in that: The axial magnetic bearing comprises the axial magnetic bearing according to any one of claims 1 to 8.

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