CN219287233U - Motor rotor - Google Patents
Motor rotor Download PDFInfo
- Publication number
- CN219287233U CN219287233U CN202320659888.4U CN202320659888U CN219287233U CN 219287233 U CN219287233 U CN 219287233U CN 202320659888 U CN202320659888 U CN 202320659888U CN 219287233 U CN219287233 U CN 219287233U
- Authority
- CN
- China
- Prior art keywords
- section shaft
- motor rotor
- permanent magnet
- closed cylinder
- front section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000005389 magnetism Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The utility model belongs to the field of high-speed motors, and discloses a motor rotor which comprises a front section shaft, a permanent magnet and a rear section shaft which are coaxially arranged, wherein the permanent magnet is arranged in a non-magnetic closed cylinder and is in tight fit with the closed cylinder; the motor rotor has the advantages that the permanent magnet is firmly and reliably installed, the magnetic leakage of the permanent magnet can be effectively reduced, the performance of the permanent magnet is improved, the permanent magnet cannot be loosened in the high-speed rotation process of the motor rotor, the motor rotor is simple in structure, small in occupied space, convenient to assemble and disassemble, low in manufacturing and using cost and long in service life.
Description
Technical Field
The utility model relates to the technical field of high-speed motors, in particular to a motor rotor of a high-speed motor.
Background
The permanent magnet high-speed motor has the advantages of high rotating speed (the rotating speed of the motor exceeds ten thousand revolutions per minute, even up to several tens of thousands of revolutions per minute), high power density, no need of a variable speed structure, low noise, quick dynamic response and the like, and is widely applied to the fields of mines, ships, spaceflight and the like. Wherein, the motor rotor is a key core component of the permanent magnet high-speed motor. The conventional motor rotor is generally provided with permanent magnets in a surface-mounted manner, and then sleeved with a magnet protection ring. For example, in chinese patent application publication No. CN103633781a, entitled "cooling of motor stator", a conventional surface-mount method is adopted for a motor rotor of a high-speed motor. For a high-speed motor, if a conventional surface-mounted mode is adopted, on one hand, the radial size of a rotor is increased, so that the motor is not beneficial to miniaturization; on the other hand, because the motor rotation speed is high, the permanent magnet pasted is difficult to bear huge centrifugal force, and the internal temperature is very high in the high-speed operation period of the motor, even if the permanent magnet is sleeved with the magnet protection ring, the permanent magnet pasted is difficult to ensure that the permanent magnet pasted is not loosened and even causes the damage of the permanent magnet, and the surface-mounted type motor is often provided with a plurality of pairs of poles, so that the switching frequency of a motor controller is increased, the control difficulty is increased, and the manufacturing and using cost is increased.
Disclosure of Invention
In view of this, the technical problems to be solved by the present utility model are: the motor rotor is simple in structure, small in occupied space and firm and reliable in permanent magnet installation.
In order to solve the technical problems, the technical scheme of the utility model is as follows: a motor rotor, the motor rotor comprising:
the permanent magnet is arranged in the non-magnetic closed cylinder body, and is tightly matched with the closed cylinder body;
the front section shaft, one end of the front section shaft is fixedly connected with one end of the closed cylinder;
one end of the rear section shaft is fixedly connected with the other end of the closed cylinder;
the front section shaft, the permanent magnet and the rear section shaft are coaxially arranged.
The following are further improvements to the motor rotor of the present utility model:
the closed cylinder comprises magnetic isolation sheets arranged at two ends of the permanent magnet and a magnet protection sleeve which is installed on the outer surfaces of the permanent magnet and the magnetic isolation sheets in an interference mode.
The permanent magnet is a solid cylinder, the magnetism isolating sheet is a round sheet, and the magnet protecting sleeve is a hollow cylinder with two open ends.
The outer peripheral surfaces of the front section shaft and the rear section shaft, which are connected with one end of the closed cylinder body, are respectively provided with a positioning boss, and the end surfaces of the magnet protecting sleeves are abutted to the positioning bosses and welded with the positioning bosses.
The end faces of the front section shaft and the rear section shaft, which are connected with one end of the closed cylinder body, are all in butt joint with the magnetism isolating sheet.
The inner part of one end, connected with the closed cylinder, of the front section shaft and the rear section shaft is of a hollow structure, and a hollow inner cavity is formed by enclosing the hollow structure with the closed cylinder.
The front section shaft and the rear section shaft are respectively provided with a bearing installation section.
The free ends of the front section shaft and the rear section shaft are respectively provided with connecting threads.
The impeller comprises a front section shaft, a bearing mounting section and connecting threads, wherein the bearing mounting section of the front section shaft and the connecting threads are arranged between the bearing mounting section of the front section shaft and the connecting threads to form an impeller mounting section.
The front section shaft and the rear section shaft are shafts made of magnetic conduction materials.
After the technical scheme is adopted, the utility model has at least the following beneficial effects:
because the motor rotor comprises the front section shaft, the permanent magnet and the rear section shaft which are coaxially arranged, the permanent magnet is arranged in the non-magnetic closed cylinder and is tightly matched with the closed cylinder, one end of the front section shaft is fixedly connected with one end of the closed cylinder, and one end of the rear section shaft is fixedly connected with the other end of the closed cylinder; because the permanent magnet is tightly constrained in the non-magnetic closed cylinder, the magnetic leakage of the permanent magnet can be reduced, and the performance of the permanent magnet can be improved; the motor rotor rotates at a high speed to generate a huge centrifugal force, and the permanent magnet is not loosened and is not easy to destroy under the reliable protection of the closed cylinder, so that the service life of the motor rotor is ensured; compared with the surface-mounted mode, the permanent magnet is arranged in the closed cylinder, so that the rotor has a relatively small radial size, small occupied space and simple structure; and the motor rotor is more convenient to assemble, and the cost is greatly reduced.
Because the front section shaft and the rear section shaft are hollow structures in the end, which is connected with the closed cylinder, on one hand, the hollow structures reduce the rotational inertia of the motor rotor, are beneficial to the dynamic balance of the whole motor rotor, are beneficial to the miniaturization and light weight design of the motor rotor, and can effectively improve the transient response of the motor; on the other hand, the hollow structure can also effectively reduce the heat transfer of the heat of the motor to the bearing direction, reduce the working temperature of the bearing and improve the service life of the bearing.
The motor rotor is designed into a split type assembly structure, so that the permanent magnet is convenient to install and detach, and if the motor rotor is damaged, the bearing is blocked and the like in the use process, a permanent magnet part with higher value in the motor rotor can be reserved during repair, and the permanent magnet can be effectively protected because the permanent magnet is installed in the closed cylinder body and can be detached for continuous use, so that the manufacturing and using costs are reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of a motor rotor structure according to an embodiment of the present utility model;
in the figure: 1. a front section shaft; 11. a front section shaft bearing mounting section; 12. an impeller mounting section; 13. the front section shaft is connected with threads; 2. magnetic isolating sheets; 3. a permanent magnet; 4. a magnet protective sleeve; 5. a rear section shaft; 51. a rear section shaft bearing mounting section; 52. the rear section shaft is connected with threads; A. a front hollow interior cavity; B. a rear hollow cavity.
Detailed Description
It should be noted that, in the description herein, unless otherwise specified or defined, the terms "connected," "connected," and the like are to be construed broadly, and may be directly connected between two elements or indirectly connected through intermediaries, and the specific meaning of the terms may be understood by those skilled in the art according to circumstances.
Embodiments of the present utility model are described in further detail below, without limitation, with reference to the accompanying drawings.
As shown in fig. 1, the motor rotor according to the embodiment of the present utility model is designed as a split assembly structure, including: the permanent magnet 3 is arranged inside the non-magnetic closed cylinder body and is in tight fit with the closed cylinder body, one end of the front section shaft 1 is fixedly connected with one end of the closed cylinder body, and one end of the rear section shaft 5 is fixedly connected with the other end of the closed cylinder body. After the high-speed motor adopts the motor rotor of the embodiment of the utility model, the permanent magnet 3 is positioned at the approximate middle position of the motor, the front section shaft 1 is positioned at the approximate front part of the motor (used for energy output of the motor), and the rear section shaft 5 is positioned at the approximate rear part of the motor.
The permanent magnet 3 is approximately positioned in the middle of the motor rotor and is in a solid cylinder shape, the permanent magnet 3 is formed by compression sintering and magnetizing of rare earth permanent magnet materials in the prior art, and the permanent magnet rotor has high magnetic energy product and good temperature resistance and can effectively improve the reliability of the motor.
Wherein, the optimization structure of the closed cylinder comprises a magnet protecting sleeve 4 and two magnetism isolating sheets 2, wherein the magnetism isolating sheets 2 are round sheets, the magnet protecting sleeve 4 is a hollow cylinder with two open ends, the magnetism isolating sheets 2 are all arranged at the two ends of the permanent magnet 3, and the magnet protecting sleeve 4 is arranged on the outer surfaces of the permanent magnet 3 and the magnetism isolating sheets 2 in an interference manner. The magnetism isolating sheet 2 and the magnet protecting sleeve 4 are made of non-magnetic conductive materials, so that the magnetic leakage of the permanent magnet can be reduced, and the performance of the permanent magnet can be improved. And, owing to adopted magnetism isolating sheet 2 and magnet protective sheath 4 as magnetism isolating structure, can prevent effectively that the magnetic leakage to make anterior segment axle 1 and back end axle 5 that link to each other with magnetism isolating sheet 2 and magnet protective sheath 4 can use magnetic conduction material to make, can effectively reduce anterior segment axle 1 and back end axle 5's manufacturing cost. The permanent magnet 3 is arranged inside the magnet protection sleeve 4 in an interference mode, the characteristic that the compressive strength of the permanent magnet 3 is high is utilized, a certain compressive stress is provided for the permanent magnet protection sleeve 4 in advance, centrifugal force generated when a part of the rotor runs at a high speed can be balanced, the stress of the permanent magnet 3 is reduced, and the reliability of the motor rotor is improved.
The outer peripheral surfaces of one ends, connected with the closed cylinder, of the front section shaft 1 and the rear section shaft 5 are provided with positioning bosses, the end faces of the magnet protecting sleeves 4 are abutted against the positioning bosses and welded with the positioning bosses, and the welding connection between the two can ensure firm and reliable assembly of the whole motor rotor. The end surfaces of the front section shaft 1 and the rear section shaft 5 which are connected with the closed cylinder body are respectively abutted with the magnetism isolating sheet 2.
Further, the inner parts of the front section shaft 1 and the rear section shaft 5 at the connecting end of the closed cylinder body are hollow structures, a front hollow cavity A is formed between the hollow structure of the front section shaft 1 and the magnetism isolating sheet 2 propped against the front section shaft, and a rear hollow cavity B is formed between the hollow structure of the rear section shaft 5 and the magnetism isolating sheet 2 propped against the rear section shaft. The hollow structure reduces the rotational inertia of the motor rotor, is beneficial to the dynamic balance of the whole motor rotor, is beneficial to the miniaturization and light weight design of the motor rotor, and can effectively improve the transient response of the motor; on the other hand, the hollow structure can also effectively reduce the heat transfer of the heat of the motor to the bearing direction, reduce the working temperature of the bearing and improve the service life of the bearing.
The front section shaft 1 is provided with a front section shaft bearing mounting section 11, a front section shaft connecting thread 13 is arranged at the free end of the front section shaft bearing mounting section 11, an impeller mounting section 12 is arranged between the front section shaft bearing mounting section 11 and the front section shaft connecting thread 13, and when the motor rotor is used on an electric compressor, the impeller mounting section 12 is used for mounting a compressor impeller. Wherein the rear section shaft 5 is provided with a rear section shaft bearing mounting section 51, the free end of which is provided with rear section shaft connecting threads 52.
When the motor rotor is manufactured, after the front section shaft 1, the rear section shaft 5 and the magnet protecting sleeve 4 are welded into a whole, the excircle is integrally processed to ensure that the dimension is consistent, thereby being beneficial to the dynamic balance of the whole motor rotor and improving the reliability of the motor. And after all the motor rotors are processed, carrying out dynamic balance test, and adopting a removal method to meet the dynamic balance requirement. After the dynamic balance test is finished, the permanent magnet is magnetized by a magnetizer, and the magnetic flux density distribution and the magnetic field intensity distribution after magnetization are tested until the set requirement is met.
In summary, according to the motor rotor disclosed by the embodiment of the utility model, the permanent magnet is tightly and cooperatively restrained in the closed cylinder body formed by the non-magnetic-conductive magnet protecting sleeve and the magnetic isolating sheet, so that the magnetic leakage of the permanent magnet can be effectively reduced, and the performance of the permanent magnet is improved; the permanent magnets are firmly and reliably installed, so that the motor rotor rotates at a high speed to generate a huge centrifugal force, the permanent magnets are not loosened, and the service life of the motor rotor is ensured; the permanent magnets are arranged in the closed cylinder body, so that the rotor has a relatively small radial size, small occupied space and simple structure, and the motor rotor is convenient to assemble and disassemble; the permanent magnet is mounted in the closed cylinder body to be effectively protected, a permanent magnet part with higher value in the motor rotor can be reserved during repair, and the permanent magnet can be detached for continuous use, so that the manufacturing and using costs are greatly reduced.
The foregoing is illustrative of the preferred embodiments of the present utility model, and all parts not specifically mentioned are known in the art, and the scope of the present utility model is defined by the appended claims.
Claims (10)
1. An electric motor rotor, characterized in that the electric motor rotor comprises:
the permanent magnet is arranged in the non-magnetic closed cylinder body, and is tightly matched with the closed cylinder body;
the front section shaft, one end of the front section shaft is fixedly connected with one end of the closed cylinder;
one end of the rear section shaft is fixedly connected with the other end of the closed cylinder;
the front section shaft, the permanent magnet and the rear section shaft are coaxially arranged.
2. The motor rotor of claim 1, wherein the closed cylinder includes magnetic shielding sheets disposed at both ends of the permanent magnet, and a magnet protecting jacket interference-fitted to outer surfaces of the permanent magnet and the magnetic shielding sheets.
3. The motor rotor of claim 2, wherein the permanent magnet is a solid cylinder, the magnetism isolating sheet is a circular sheet, and the magnet protecting sleeve is a hollow cylinder with two open ends.
4. The motor rotor according to claim 2, wherein the outer peripheral surfaces of the ends of the front section shaft and the rear section shaft connected with the closed cylinder are provided with positioning bosses, and the end faces of the magnet protecting sleeves are abutted against the positioning bosses and welded with the positioning bosses.
5. The motor rotor according to claim 2, wherein end surfaces of the front section shaft and the rear section shaft at the end connected to the closed cylinder are abutted against the magnetism isolating sheet.
6. The motor rotor of claim 1, wherein the front section shaft and the rear section shaft are hollow structures in the ends, connected with the closed cylinder, of the closed cylinder, and a hollow inner cavity is formed between the hollow structures and the closed cylinder.
7. The motor rotor of claim 1, wherein the front section shaft and the rear section shaft are each provided with a bearing mounting section.
8. The motor rotor of claim 7, wherein the free ends of the front section shaft and the rear section shaft are each provided with connecting threads.
9. The motor rotor of claim 8, wherein an impeller mounting section is provided between the bearing mounting section of the front section shaft and the connecting threads.
10. The motor rotor of claim 1, wherein the front section shaft and the rear section shaft are both shafts of magnetically permeable material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320659888.4U CN219287233U (en) | 2023-03-27 | 2023-03-27 | Motor rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320659888.4U CN219287233U (en) | 2023-03-27 | 2023-03-27 | Motor rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219287233U true CN219287233U (en) | 2023-06-30 |
Family
ID=86905739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320659888.4U Active CN219287233U (en) | 2023-03-27 | 2023-03-27 | Motor rotor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219287233U (en) |
-
2023
- 2023-03-27 CN CN202320659888.4U patent/CN219287233U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |