CN115912718A - Rotor assembly and magnetic suspension motor - Google Patents
Rotor assembly and magnetic suspension motor Download PDFInfo
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- CN115912718A CN115912718A CN202211434364.1A CN202211434364A CN115912718A CN 115912718 A CN115912718 A CN 115912718A CN 202211434364 A CN202211434364 A CN 202211434364A CN 115912718 A CN115912718 A CN 115912718A
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- shaft
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- wedge
- rotor assembly
- permanent magnet
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Abstract
The application provides a rotor subassembly and magnetic suspension motor. The rotor assembly comprises a rotating shaft, a first shaft and a second shaft, wherein the first shaft and the second shaft are clamped in an axial direction to form the rotating shaft; the permanent magnet comprises a magnetic shoe and is fixed on the peripheral wall of the joint of the first shaft and the second shaft. This application adopts two minor axises of mutual joint to constitute the pivot to use fan-shaped permanent magnet to wrap the joint department periphery, can guarantee the permanent magnet assembly back with the axiality of two minor axises.
Description
Technical Field
The application belongs to the technical field of magnetic suspension motors, and particularly relates to a rotor assembly and a magnetic suspension motor.
Background
The magnetic suspension motor is a low-loss and high-performance motor, which utilizes the electromagnetic force action of the magnetic bearing to suspend the motor rotor in the air, so that the motor rotor is not in mechanical contact with the motor stator, and mechanical friction loss is avoided. The motor has the advantages of no mechanical wear, low energy consumption, low noise, long service life, no need of lubrication and sealing, no oil pollution and the like while realizing high rotation speed of the motor rotor; the rotation speed of the magnetic suspension motor rotor is only limited by the tensile strength of the rotor material, so the peripheral speed of the magnetic suspension motor rotor can be very high, and the magnetic suspension motor rotor is more and more widely applied to high-speed equipment.
The traditional side-weight speed type non-salient pole high-speed motor rotor structure consists of a rotating shaft, a permanent magnet and a sheath, wherein the rotating shaft is divided into two parts, and the permanent magnet is arranged between the rotating shafts of the two parts; because the permanent magnet is subjected to a very large centrifugal tension in the operation process of the high-speed motor, the permanent magnet material has the characteristics of compression resistance and no tension, and the permanent magnet must be protected in strength through a sheath in order to prevent the permanent magnet from being damaged in a normal working state. The existing high-speed magnetic bearing rotor adopts a sheath to protect a permanent magnet, the sheath is sleeved on the permanent magnet in a heating sleeving manner, the heating temperature is 500-700 ℃, the sheath expands with heat and contracts with cold, a gap is formed between the two ends of a front shaft and a second shaft after cooling, and the two short shafts are easy to loosen in the left-right direction. In the use of reality, because the processing material of two minor axes is different around, and there are machining error and assembly error, the interior circle cylindricity of reunion sheath, and the clearance at both ends is not of uniform size, even the whole round clearance in single clearance is inhomogeneous, can lead to preceding like this, two minor axes in back assemble out the axiality and appear the error, it is unbalanced to make the permanent magnet receive motor stator's magnetic force, cause the rotor operation cycle vibration, the suspension precision is poor, also can appear preceding, when the secondary shaft receives the axial force, can produce and cooperate the department not hard up with the sheath, the long phenomenon of axle length extension, thereby influence the stable suspension operation of rotor, the rotor reliability has been reduced.
Disclosure of Invention
Therefore, the application provides a rotor subassembly and magnetic suspension motor, can solve among the prior art two preceding, back minor axes and assemble out the axiality and error appears, has reduced the problem of rotor reliability.
In order to solve the above problems, the present application provides a rotor assembly including:
the rotating shaft comprises a first shaft and a second shaft which are clamped along the axial direction to form the rotating shaft;
the permanent magnet comprises a magnetic shoe and is fixed on the outer peripheral wall of the joint of the first shaft and the second shaft.
Optionally, the first shaft and the second shaft are provided with a snap on at opposite ends thereof.
Optionally, the first shaft is provided with wedge-shaped grooves on opposite ends, and the second shaft is provided with wedge-shaped bosses on opposite ends; or the first shaft is provided with a wedge-shaped boss at the opposite end, and the second shaft is provided with a wedge-shaped groove at the opposite end; the wedge-shaped groove and the wedge-shaped boss are correspondingly clamped, and the width of the opening of the wedge-shaped groove is smaller than that of the bottom of the wedge-shaped groove.
Alternatively, the rotating shaft may be provided with mounting grooves on peripheries of opposite ends of the first shaft and the second shaft, and the permanent magnets may be provided in the mounting grooves.
Optionally, a first rib is arranged on the outer wall of the first shaft in the circumferential direction, a second rib is arranged on the outer wall of the second shaft in the circumferential direction, and the mounting groove is formed between the first rib and the second rib.
Optionally, the rotor assembly further comprises a sheath covering the mounting slot forming a chamber containing the permanent magnet.
Optionally, one of the first and second ribs has a diameter that is the same as the outer diameter of the sheath and the other has an inner diameter that is the same as the inner diameter of the sheath.
Optionally, the rotor assembly further comprises a bearing assembly, the bearing assembly comprises a bearing rotor sleeved on the first shaft and the second shaft, and the bearing rotor is arranged outside the mounting groove.
Optionally, the bearing assembly further includes retaining rings disposed at two ends of the bearing rotor, and the retaining rings are sleeved on the first shaft and the second shaft.
According to another aspect of the present application, there is provided a magnetic levitation motor comprising a rotor assembly as described above.
The present application provides a rotor assembly comprising: the rotating shaft comprises a first shaft and a second shaft, and the first shaft and the second shaft are clamped in an axial direction to form the rotating shaft; the permanent magnet comprises a magnetic shoe and is fixed on the peripheral wall of the joint of the first shaft and the second shaft.
This application adopts two minor axes of mutual joint to constitute the pivot to use fan-shaped permanent magnet to wrap the periphery of joint department, can guarantee the permanent magnet assembly back with the axiality of two minor axes.
Drawings
FIG. 1 is a cross-sectional structural schematic view of a rotor assembly of an embodiment of the present application;
FIG. 2 is a schematic view of a magnetic flux circuit of a rotor assembly of an embodiment of the present application;
fig. 3 is a schematic structural diagram of a rotating shaft according to an embodiment of the present application.
The reference numerals are represented as:
1. a first shaft; 11. a first rib; 2. a second shaft; 21. a second rib; 3. a permanent magnet; 4. a sheath; 5. a baffle ring; 6. a bearing rotor; 7. and (4) a baffle ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring collectively to fig. 1-3, according to an embodiment of the present application, a rotor assembly includes:
the rotating shaft comprises a first shaft 1 and a second shaft 2, and the first shaft 1 and the second shaft 2 are clamped and connected in an axial direction to form the rotating shaft;
and the permanent magnet 3 comprises a magnetic shoe and is fixed on the peripheral wall of the joint of the first shaft 1 and the second shaft 2.
This application adopts two minor axes of mutual joint to constitute the pivot to use fan-shaped permanent magnet 3 to wrap the periphery of joint department, can guarantee the permanent magnet 3 assembly back with the axiality of two minor axes.
Two minor axes form the coaxial, axial unreleasable structure of mutually supporting through mutually supporting, can effectually keep its structure axiality and axial unreleasable, improve structural stability.
The fan-shaped permanent magnets 3 are used, the weight of the permanent magnets 3 is reduced, and the coaxiality of the permanent magnets 3 and the two short shafts after assembly is guaranteed through pre-forming and then attaching and assembling.
In some embodiments, the first shaft 1 and the second shaft 2 are provided with snap-in members on opposite ends thereof.
Through set up joint spare on the relative end of primary shaft 1 and secondary shaft 2, can conveniently realize the assembly of two minor axises.
In some embodiments, the first shaft 1 is provided with wedge-shaped grooves on opposite ends, and the second shaft 2 is provided with wedge-shaped bosses on opposite ends; or the opposite end of the first shaft 1 is provided with a wedge-shaped boss, and the opposite end of the second shaft 2 is provided with a wedge-shaped groove; the wedge-shaped groove and the wedge-shaped boss are correspondingly clamped, and the width of the opening of the wedge-shaped groove is smaller than that of the bottom of the wedge-shaped groove.
The joint spare adopts the wedge structure of relative joint, and the mutually supporting of wedge-shaped boss and recess is favorable to improving two minor axis structural integrity and rotor rigidity after the rotor assembly.
The rotating shaft adopts two short shaft structures, the two short shafts both adopt special-shaped structures, and opposite ends are provided with wedge-shaped structures, for example, a wedge-shaped body structure similar to a concave shape is used on the first shaft 1 to form a wedge-shaped groove; the opposite end of the second shaft 2 is provided with a wedge-shaped structure similar to a convex shape to form a wedge-shaped boss; or, a wedge-shaped structure similar to a concave shape is used on the second shaft 2 to form a wedge-shaped groove; the opposite end of the first shaft 1 adopts a wedge-shaped body structure similar to a convex shape to form a wedge-shaped boss; the wedge-shaped groove and the wedge-shaped boss are oppositely inserted and matched to form a cylinder, so that the assembly coaxiality is ensured, and the purpose of matching and fixing the axis is achieved.
After the first shaft 1 and the second shaft 2 of the rotor are assembled, the two short shafts form an unreleasable fastening structure in the axial direction, and the axial direction looseness and extension of the two short shafts in the normal operation process can be effectively prevented.
The wedge-shaped structures of the first shaft 1 and the second shaft 2 are oppositely inserted and can be in interference fit with each other, the coaxiality precision of the assembled rotating shafts is improved, meanwhile, axial looseness of the two short shafts in the operation process is prevented, and the rigidity and the reliability of the rotor are improved.
In some embodiments, the rotating shaft is provided with mounting grooves on the outer circumferences of opposite ends of the first and second shafts 1 and 2, and the permanent magnets 3 are provided in the mounting grooves.
For the convenience of assembling the permanent magnet 3 on the periphery of the rotating shaft, the mounting groove is formed in the periphery of the rotating shaft, so that the assembling speed and the assembling precision can be improved.
In some embodiments, the first rib 11 is circumferentially arranged on the outer wall of the first shaft 1, the second rib 21 is circumferentially arranged on the outer wall of the second shaft 2, and the mounting groove is formed between the first rib 11 and the second rib 21.
The specific arrangement of the mounting groove between the two short shafts can be limited by the first rib 11 and the second rib 21, so that the permanent magnet 3 can be effectively prevented from moving in the axial direction of the rotating shaft, and the stability is improved.
In some embodiments, the rotor assembly further comprises a sheath 4, the sheath 4 covering the mounting slot, forming a chamber for accommodating the permanent magnet 3.
Non-magnetic materials (such as SUS 304) are used for the two short shafts of the rotor, the materials of the two short shafts can be different, the fan-shaped permanent magnet 3 is arranged in the middle of the two short shafts, and the outer diameter of the permanent magnet 3 is limited by the sheath 4, so that the permanent magnet 3 is protected during high-speed rotation. The sheath 4 may be made of high-strength alloy or high-strength material such as high-strength carbon fiber.
In some embodiments, one of the first and second ribs 11, 21 has the same diameter as the outer diameter of the sheath 4 and the other has the same diameter as the inner diameter of the sheath 4.
Two first convex ridges 11 and two second convex ridges 21 with different outer diameters are adopted, so that one end of the sheath 4 with a rotating shaft is sleeved on the periphery of the permanent magnet 3, the sheath 4 and two end faces of the two short shafts are tightly attached without gaps to form a whole, and the rotor rigidity is improved.
In some embodiments, the rotor assembly further comprises a bearing assembly, the bearing assembly comprises a bearing rotor 6 sleeved on the first shaft 1 and the second shaft 2, and the bearing rotor 6 is arranged outside the mounting groove.
When the rotor assembly is connected with the magnetic suspension bearing, axial limiting can be achieved through the bearing rotors 6 at two ends of the rotating shaft, and the running stability of the rotor assembly is achieved through a magnetic flux loop on the whole rotating shaft, including the radial direction and the axial direction, as shown in fig. 2.
In some embodiments, the bearing assembly further includes retaining rings disposed at two ends of the bearing rotor 6, and the retaining rings are sleeved on the first shaft 1 and the second shaft 2.
And the two ends of the bearing rotor 6 are provided with the baffle rings 5 and 7, so that the stability of the bearing rotor 6 and the rotor component is improved.
The rotor assembly adopts a wedge-shaped axial anti-loosening structure matched with each other, and the two short shafts of the rotating shaft are used for assembling the fan-shaped permanent magnet 3 and the alloy sheath 4, so that the structural strength, integrity and rigidity of the assembled rotor shaft are improved, the coaxiality of the assembled permanent magnet 3 and the two short shafts is ensured, the stress balance of the permanent magnet 3 is achieved, the periodic vibration is eliminated, the noise of the whole machine is reduced, the two short shafts are prevented from being loosened axially, the suspension precision of the rotor is ensured, and the running reliability of the rotor is improved; in addition, the interference magnitude of the fan-shaped permanent magnet 3 and the alloy sheath 4 is reduced, the heating temperature of the alloy sheath 4 assembled by a hot sleeve is reduced, the deformation of the alloy sheath 4 caused by thermal expansion and cold contraction is reduced, and then the gap between the alloy sheath 4 and the end faces of the two short shafts of the rotor after assembly is eliminated, so that the whole rotor shaft forms a whole, and the stability and the reliability of the rotor shaft in the operation process are improved.
The assembly process of this application rotor subassembly:
processing: parts such as the first shaft 1, the second shaft 2, the fan-shaped permanent magnet 3, the alloy sheath 4, the baffle ring 5, the bearing rotor 6, the baffle ring 7 and the like are machined, and the bearing rotor 6 is formed by stamping and overlapping silicon steel sheets;
assembling: the bearing assembly is formed by laminating a retaining ring 5, a bearing rotor 6 and a retaining ring 7 into a whole through a tool to form a bearing assembly, laminating the bearing assembly into a whole through the tool, and then hot-mounting the bearing assembly on a short shaft to enable the bearing assembly to be integrally fixed in the short shaft (thermal expansion and cold contraction, interference fit on the short shaft to form a bearing rotor 6 assembly), manually assembling the two short shafts into an integral shaft through a wedge-shaped structure, axially preventing loosening and radially disassembling, bonding a fan-shaped permanent magnet 3 on an assembled rotating shaft through structural glue in an auxiliary fixing mode (fixing before hot mounting and auxiliary fixing after hot mounting), mainly fixing the fan-shaped permanent magnet 3 through an outer ring alloy sheath 4, further sleeving the fan-shaped permanent magnet 3 through a heating alloy sheath 4 (controlling the temperature to be within 100 ℃ to ensure small interference fit), and then hot sleeving the fan-shaped permanent magnet 3, forming the two short shafts and the fan-shaped permanent magnet 3 into a whole after the alloy sheath 4 is cooled, enabling the two short shafts to be radially undetachable due to the sheath 4 and the permanent magnet 3 through the wedge-shaped structure, enabling the two short shafts to be axially unreleasable to be in the axial direction, enabling the two short shafts and the two short shaft to be coaxially matched at the axial interference fit at the assembling position, ensuring coaxial degree of the coaxial anti-loosening degree, the short shaft strength and the axial strength and the short shaft strength and the rigidity of the magnetic bearing assembly, and the two short shaft position of the bearing assembly, and the bearing assembly to form a high-speed bearing assembly into a high-speed bearing assembly of the bearing assembly, and the bearing assembly of the bearing assembly, and the high-speed rotor 6, and the high-speed rotor 6 assembly, and the rotor, and finally heating of the rotor to form a high-speed rotor.
According to another aspect of the present application, there is provided a magnetic levitation motor comprising a rotor assembly as described above.
It will be readily appreciated by those skilled in the art that the above embodiments may be freely combined, superimposed without conflict.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be regarded as the protection scope of the present application.
Claims (10)
1. A rotor assembly, comprising:
the rotating shaft comprises a first shaft (1) and a second shaft (2), and the first shaft (1) and the second shaft (2) are clamped in an axial direction to form the rotating shaft;
and the permanent magnet (3) comprises a magnetic shoe and is fixed on the peripheral wall of the joint of the first shaft (1) and the second shaft (2).
2. The rotor assembly according to claim 1, wherein the first shaft (1) and the second shaft (2) are provided with snap-in members on opposite ends.
3. The rotor assembly according to claim 2, wherein the first shaft (1) is provided with wedge-shaped recesses on opposite ends and the second shaft (2) is provided with wedge-shaped bosses on opposite ends; or the opposite end of the first shaft (1) is provided with a wedge-shaped boss, and the opposite end of the second shaft (2) is provided with a wedge-shaped groove; the wedge-shaped groove and the wedge-shaped boss are correspondingly clamped, and the width of the opening of the wedge-shaped groove is smaller than that of the bottom of the wedge-shaped groove.
4. A rotor assembly according to any one of claims 1-3, wherein the rotating shaft is provided with mounting slots on the outer peripheries of opposite ends of the first shaft (1) and the second shaft (2), and the permanent magnets (3) are provided in the mounting slots.
5. The rotor assembly according to claim 4, wherein the first shaft (1) is provided with a first rib (11) on the outer wall in the circumferential direction, the second shaft (2) is provided with a second rib (21) on the outer wall in the circumferential direction, and the mounting groove is formed between the first rib (11) and the second rib (21).
6. The rotor assembly according to claim 5, further comprising a sheath (4), the sheath (4) covering the mounting slot forming a chamber containing the permanent magnet (3).
7. The rotor assembly according to claim 6, wherein one of the first rib (11) and the second rib (21) has a diameter that is the same as an outer diameter of the sheath (4) and the other has a diameter that is the same as an inner diameter of the sheath (4).
8. A rotor assembly as claimed in any one of claims 5 to 7, further comprising a bearing assembly comprising a bearing rotor (6) fitted over the first and second shafts (1, 2), the bearing rotor (6) being located outside the mounting slot.
9. The rotor assembly according to claim 8, wherein the bearing assembly further comprises a retainer ring provided at both ends of the bearing rotor (6), and the retainer ring is sleeved on the first shaft (1) and the second shaft (2).
10. A magnetically levitated motor comprising a rotor assembly according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211434364.1A CN115912718A (en) | 2022-11-16 | 2022-11-16 | Rotor assembly and magnetic suspension motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211434364.1A CN115912718A (en) | 2022-11-16 | 2022-11-16 | Rotor assembly and magnetic suspension motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115912718A true CN115912718A (en) | 2023-04-04 |
Family
ID=86494325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211434364.1A Pending CN115912718A (en) | 2022-11-16 | 2022-11-16 | Rotor assembly and magnetic suspension motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115912718A (en) |
-
2022
- 2022-11-16 CN CN202211434364.1A patent/CN115912718A/en active Pending
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