CN213243668U - Structure for improving strength of high-temperature high-speed permanent magnet rotor - Google Patents
Structure for improving strength of high-temperature high-speed permanent magnet rotor Download PDFInfo
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- CN213243668U CN213243668U CN202022384101.7U CN202022384101U CN213243668U CN 213243668 U CN213243668 U CN 213243668U CN 202022384101 U CN202022384101 U CN 202022384101U CN 213243668 U CN213243668 U CN 213243668U
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Abstract
The utility model provides a structure for improving the strength of a high-temperature high-speed permanent magnet rotor, which comprises a rotating shaft; a shaft excircle groove and a shaft excircle boss are machined on the maximum excircle of the rotating shaft, tangential magnetic steel is embedded in the shaft excircle groove, and radial magnetic steel is bonded on the shaft excircle boss; the tangential magnetic steel and the radial magnetic steel form rotor magnetic steel, L-shaped sheaths are respectively arranged at two ends of the rotor magnetic steel, and a circular ring sheath is arranged in the middle of the rotor magnetic steel. The utility model discloses the magnet steel segmentation is favorable to reducing rotor eddy current loss, promotes generator efficiency; the magnetic steel and the sheath can be segmented to enable the centrifugal force of the magnetic steel to uniformly act on the sheath, so that the deformation and stress distribution of the sheath are more uniform, the risk of sweeping the chamber due to overlarge deformation when the rotor rotates at a high speed can be avoided, the strength of the rotor is improved, the sheath is ensured not to be cracked under the action of the centrifugal force of the magnetic steel, and the high-speed resistance of the permanent magnet rotor can be effectively improved.
Description
Technical Field
The utility model relates to a promote structure of high-speed permanent magnet rotor intensity of high temperature belongs to electrical engineering technical field, concretely relates to maximum rotational speed reaches high-speed permanent magnet rotor structure of 36000r/min, is applicable to high-temperature high-speed generator.
Background
The conventional permanent magnet rotor adopts a steel sheath to wrap the excircle of the magnetic steel to prevent the magnetic steel from being thrown out under the action of centrifugal force, the steel sheath of the rotor usually adopts a combined structure of an L-shaped integral sheath and a baffle, the joint of the L-shaped integral sheath and the baffle adopts a glue bonding or laser welding structure, as shown in figure 7, the magnetic steel 10 is usually fastened by adopting the L-shaped integral sheath 11, namely the L-shaped integral sheath 11 in contact with the excircle surface of the magnetic steel 10 is a whole, the open side of the L-shaped integral sheath 11 is connected with the baffle 9 by laser welding, and then is connected with a shaft 8 after welding, because the radial direction of the open side of the L-shaped integral sheath 11 is not limited enough, the centrifugal force can make the deformation of the open side larger during high-speed rotation, the welding part of the L-shaped integral sheath 11 and the baffle 9 is easy to lose efficacy under the action of, the larger the amount of deformation on the opening side, the structure of the conventional L-shaped integrated sheath 11 greatly reduces the high-speed resistance of the rotor.
In summary, for the rotor with high rotating speed and large radius, the sheath can generate large radial deformation under the action of the centrifugal force of the sheath, and the welding or bonding position is easy to break due to stress concentration after being stretched, so that the sheath is broken or deformed greatly to cause the failure of the rotor; under the conditions of high temperature and high speed, the crystalline phase of a common metal material is changed in a high-temperature environment, so that the yield strength is reduced, the load resistance is weakened, and a rotor in the high-temperature environment is more prone to failure than a rotor in the normal temperature.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a promote structure of high-temperature high-speed permanent magnet rotor intensity, this kind of structure that promotes high-temperature high-speed permanent magnet rotor intensity has strengthened permanent magnet rotor's mechanical strength, can ensure permanent magnet rotor safe operation under high rotational speed.
The utility model discloses a following technical scheme can realize.
The utility model provides a structure for improving the strength of a high-temperature high-speed permanent magnet rotor, which comprises a rotating shaft; a shaft excircle groove and a shaft excircle boss are machined on the maximum excircle of the rotating shaft, tangential magnetic steel is embedded in the shaft excircle groove, and radial magnetic steel is bonded on the shaft excircle boss; the tangential magnetic steel and the radial magnetic steel form rotor magnetic steel, L-shaped sheaths are respectively arranged at two ends of the rotor magnetic steel, and a circular ring sheath is arranged in the middle of the rotor magnetic steel.
The rotating shaft is of a hollow structure.
The shaft excircle grooves and the shaft excircle bosses are alternately arranged to form a whole circle.
The magnetic steel segmentation technology is adopted, the radial magnetic steel is installed in three sections, and the tangential magnetic steel is installed in two sections.
And (3) respectively assembling the annular sheath and the L-shaped sheath on the rotor magnetic steel in a partitioning manner after the annular sheath and the L-shaped sheath generate radial expansion by adopting a thermal sleeve method, and connecting the annular sheath and the L-shaped sheath with the rotating shaft.
The circular ring sheath and the L-shaped sheath are arranged in a staggered mode, and the dividing surfaces of the circular ring sheath and the L-shaped sheath are arranged in a staggered mode.
The beneficial effects of the utility model reside in that: the magnetic steel is segmented, so that the eddy current loss of the rotor is reduced, and the efficiency of the generator is improved; the magnetic steel and the sheath can be segmented to enable the centrifugal force of the magnetic steel to uniformly act on the sheath, so that the deformation and stress distribution of the sheath are more uniform, the risk of sweeping the chamber due to overlarge deformation when the rotor rotates at a high speed can be avoided, the strength of the rotor is improved, the sheath is ensured not to be cracked under the action of the centrifugal force of the magnetic steel, and the high-speed resistance of the permanent magnet rotor can be effectively improved.
Drawings
Fig. 1 is an exploded view of the present invention;
FIG. 2 is a schematic structural view of the rotating shaft of the present invention;
fig. 3 is a cross-sectional view of the present invention;
FIG. 4 is a cross-sectional view of the tangential magnetic steel and the radial magnetic steel of the present invention;
FIG. 5 is a schematic structural view of the ring sheath of the present invention;
FIG. 6 is a schematic structural view of the L-shaped sheath of the present invention;
FIG. 7 is a schematic structural view of a conventional rotor;
in the figure: the novel bearing comprises a rotating shaft 1, tangential magnetic steel 2, radial magnetic steel 3, a circular ring sheath 4, a 5-L-shaped sheath, a 6-shaft excircle groove, a 7-shaft excircle boss, an 8-shaft, a 9-baffle, a 10-magnetic steel and an 11-L-shaped integral sheath.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in fig. 1 to 6, a structure for improving the strength of a high-temperature and high-speed permanent magnet rotor comprises a rotating shaft 1; a shaft excircle groove 6 and a shaft excircle boss 7 are machined on the maximum excircle of the rotating shaft 1, tangential magnetic steels 2 are embedded in the shaft excircle groove 6, and radial magnetic steels 3 are bonded on the shaft excircle boss 7 to limit circumferential rotation possibly caused by tangential magnetic force when the magnetic steels work; the magnetic circuit structure adopts a Halbach form, namely the tangential magnetic steel 2 and the radial magnetic steel 3 form rotor magnetic steel, the radial magnetic steel 3 provides main radial magnetic flux for a magnetic field, and the tangential magnetic steel is auxiliary radial magnetic flux, so that the magnetic circuit structure has a magnetic gathering effect and can reduce weight; secondly, the traditional L-shaped integral type sheath is segmented, L-shaped sheaths 5 are respectively arranged at two ends of the rotor magnetic steel, and a circular ring sheath 4 is arranged in the middle of the rotor magnetic steel.
The rotating shaft 1 is of a hollow structure, so that the weight and the rotational inertia of the permanent magnet rotor are reduced, and the electromechanical operation performance of the permanent magnet rotor is improved.
The shaft excircle grooves 6 and the shaft excircle bosses 7 are alternately arranged to form a whole circle.
Preferably, the large-size magnetic steel generates large eddy current loss during high-speed rotation, and based on the purpose of reducing the loss, a magnetic steel segmentation technology is adopted, the radial magnetic steel 3 is installed in a three-section mode, and the tangential magnetic steel 2 is installed in a two-section mode, so that the motor efficiency is improved.
Furthermore, the size of the rotor magnetic steel is reduced after segmentation, when the rotor runs at a high speed, the deformation of the excircle of the rotor magnetic steel is more uniform, uniform pressure can be generated on the protective sleeve (the circular ring protective sleeve and the L-shaped protective sleeve), and the stress condition of the protective sleeve (the circular ring protective sleeve and the L-shaped protective sleeve) is improved.
In the rotor assembling process, a thermal sleeve method is adopted, after the annular sheath 4 and the L-shaped sheath 5 generate radial expansion, the annular sheath 4 and the L-shaped sheath 5 are assembled on the rotor magnetic steel in a partitioning mode respectively and are connected with the rotating shaft 1, large interference assembly is achieved, and the rotor magnetic steel has large pre-compression stress and is not pulled to crack by centrifugal force.
The cutting surfaces of the circular ring sheath 4 and the L-shaped sheath 5 and the cutting surface of the rotor magnetic steel are staggered, so that the stress generated by the two pieces of magnetic steel (the tangential magnetic steel 2 and the radial magnetic steel 3) at the connecting position to the sheaths (the circular ring sheath and the L-shaped sheath) is uniformly transited, and the centrifugal force resistance of the sheaths (the circular ring sheath and the L-shaped sheath) during high-speed rotation is improved.
Preferably, the rotating shaft 1 is made of 1Cr17Ni2 material with good mechanical property and magnetic conductivity, so that the integrated design of the magnetic conductivity structure and the transmission structure of the high-speed permanent magnet rotor is realized, the part processing and assembling procedures are reduced, and the strength of the shaft is improved.
Preferably, the rotor magnetic steel material selects high-temperature-resistant rare earth magnetic steel, the service temperature of the rotor magnetic steel can reach 500 ℃ without demagnetization, and the high-temperature use requirement of the permanent magnet rotor can be met.
Specifically, the sheaths (the ring sheath and the L-shaped sheath) are positioned on the maximum excircle of the high-speed permanent magnet rotor, the centrifugal force is the maximum, and the sheaths are also subjected to the centrifugal force of rotor magnetic steel and the extrusion effect of interference magnitude, so that the sheaths (the ring sheath and the L-shaped sheath) are the most critical parts for the strength design of the rotor. The utility model discloses sheath (ring sheath and L type sheath) adopts the superalloy material, still can maintain yield stress when 400 ℃ -500 ℃ and be more than 950MPa, can guarantee to resume to initial condition after the rotor stop work, eliminates plastic deformation's accumulation, effectively promotes the mechanical strength of rotor.
Specifically, during the rotor during operation of high rotational speed, major diameter, centrifugal force can make the structure produce great deflection, and rotor magnet steel resistance to compression does not pull, for the protection rotor magnet steel is not broken by the pulling when high-speed rotatory, adopts big excessive assembly technique between sheath (ring sheath and L type sheath) and the rotor magnet steel.
To sum up, the utility model discloses a high-speed permanent magnet rotor of high temperature mainly comprises sheath (ring sheath and L type sheath), rotor magnet steel (tangential magnet steel and radial magnet steel) and pivot, and the magnet steel reduces because of the magnitude of interference when having solved the high-speed rotation of permanent magnet rotor and leads to the magnet steel cracked, the magnet steel bonding agent inefficacy back metal sheath receives strong centrifugal force effect and warp, the problem that high temperature condition metal material yield strength reduces and causes the rotor strength variation effectively promotes permanent magnet rotor mechanical strength and resistant high-speed ability.
Claims (6)
1. The utility model provides a promote structure of high-temperature high-speed permanent magnet rotor intensity, includes pivot (1), its characterized in that: a shaft excircle groove (6) and a shaft excircle boss (7) are machined on the maximum excircle of the rotating shaft (1), a tangential magnetic steel (2) is embedded in the shaft excircle groove (6), and a radial magnetic steel (3) is bonded on the shaft excircle boss (7); the tangential magnetic steel (2) and the radial magnetic steel (3) form rotor magnetic steel, L-shaped sheaths (5) are respectively arranged at two ends of the rotor magnetic steel, and a circular ring sheath (4) is arranged in the middle of the rotor magnetic steel.
2. The structure for improving the strength of the high-temperature high-speed permanent magnet rotor according to claim 1, wherein: the rotating shaft (1) is of a hollow structure.
3. The structure for improving the strength of the high-temperature high-speed permanent magnet rotor according to claim 1, wherein: the shaft excircle grooves (6) and the shaft excircle bosses (7) are alternately arranged to form a whole circle.
4. The structure for improving the strength of the high-temperature high-speed permanent magnet rotor according to claim 1, wherein: the magnetic steel segmentation technology is adopted, the radial magnetic steel (3) is installed in three sections, and the tangential magnetic steel (2) is installed in two sections.
5. The structure for improving the strength of the high-temperature high-speed permanent magnet rotor according to claim 1, wherein: and (3) respectively assembling the circular ring sheath (4) and the L-shaped sheath (5) on the rotor magnetic steel in a partitioning manner after the circular ring sheath (4) and the L-shaped sheath (5) generate radial expansion by adopting a thermal sleeve method, and connecting the circular ring sheath (4) and the L-shaped sheath (5) with the rotating shaft (1).
6. The structure for improving the strength of the high-temperature high-speed permanent magnet rotor according to claim 1, wherein: the cutting surfaces of the circular ring sheath (4) and the L-shaped sheath (5) and the cutting surface of the rotor magnetic steel are arranged in a staggered mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022384101.7U CN213243668U (en) | 2020-10-23 | 2020-10-23 | Structure for improving strength of high-temperature high-speed permanent magnet rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022384101.7U CN213243668U (en) | 2020-10-23 | 2020-10-23 | Structure for improving strength of high-temperature high-speed permanent magnet rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213243668U true CN213243668U (en) | 2021-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022384101.7U Active CN213243668U (en) | 2020-10-23 | 2020-10-23 | Structure for improving strength of high-temperature high-speed permanent magnet rotor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213243668U (en) |
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- 2020-10-23 CN CN202022384101.7U patent/CN213243668U/en active Active
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