CN210957999U - Permanent magnet motor - Google Patents
Permanent magnet motor Download PDFInfo
- Publication number
- CN210957999U CN210957999U CN201922300774.7U CN201922300774U CN210957999U CN 210957999 U CN210957999 U CN 210957999U CN 201922300774 U CN201922300774 U CN 201922300774U CN 210957999 U CN210957999 U CN 210957999U
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- Prior art keywords
- main shaft
- bearing
- permanent magnet
- electric machine
- insulating
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Abstract
The utility model provides a permanent magnet motor, include: the motor comprises a shell, a left end cover, a right end cover, a stator assembly and a rotor assembly, wherein the rotor assembly comprises a main shaft, a rotor core and a bearing, the left end of the main shaft penetrates through a through hole in the middle of the left end cover, the right end of the main shaft penetrates through a through hole in the middle of the right end cover, an insulating layer is arranged between an inner ring of the bearing and the outer circumferential surface of the main shaft, and insulating pads are arranged on two side surfaces of the bearing, so that the bearing and the main shaft are mutually insulated, when shaft current passes through the main shaft, the shaft current cannot flow through the bearing, the heating phenomenon of the bearing caused by the flow of the shaft current is avoided.
Description
Technical Field
The utility model relates to a permanent-magnet machine field, concretely relates to can reduce permanent-magnet machine that bearing calorific capacity.
Background
The permanent magnet motor has simple structure, high reliability and high efficiency, thus has wide application, the permanent magnet motor is powered by the inverter, the inverter can generate certain common mode voltage when being powered, and the permanent magnet motor has the problems of end leakage, asymmetric magnetic flux, residual magnetism, electrostatic effect and the like, and can generate shaft current, the heat productivity of the permanent magnet motor bearing mainly comes from two parts, one part is the heat produced by friction when the bearing rotates, the other part is because of the resistance value of the bearing, the heat generated when the shaft current flows through the permanent magnet motor is small and negligible when the power of the permanent magnet motor is small, when the power of the permanent magnet motor is larger, the heat generated by the shaft current is larger, so that the bearing is heated, therefore, the performance of the bearing is reduced, the service life of the bearing is shortened, and how to reduce the heat productivity of the high-power permanent magnet motor bearing is a problem which needs to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming prior art's shortcoming, providing a can reduce bearing calorific capacity's permanent-magnet machine.
In order to achieve the above object, the present invention adopts a technical solution that a permanent magnet motor capable of reducing heat generation of a bearing includes:
a housing;
end covers arranged at two ends of the shell;
the stator assembly is arranged in the shell and comprises a stator core and a winding, and the stator assembly is fixedly connected with the shell and the end cover;
the rotor assembly penetrates through the stator core and comprises a main shaft, a rotor core and bearings, the rotor core is sleeved on the main shaft, the bearings are sleeved on the main shaft and are positioned at two ends of the rotor core, and the main shaft is rotatably connected with the end covers through the bearings;
an insulating layer is arranged between the inner ring of the bearing and the outer circumferential surface of the main shaft;
and two side surfaces of the bearing are provided with insulating pads.
Preferably, the insulating layer is composed of an insulating material sprayed on the outer circumferential surface of the main shaft.
Further preferably, the insulating material is ceramic.
Further preferably, the insulating material is sprayed on an area of the outer circumferential surface of the main shaft, which is in contact with the bearing inner ring.
Preferably, the insulating pad is sleeved on the main shaft.
Further preferably, the outer diameter of the insulating pad is larger than the diameter of a shoulder on the main shaft for abutting against the bearing.
Further preferably, the outer diameter of the insulating pad is larger than the outer diameter of the bearing inner race.
Preferably, the thickness of the insulating layer is 0.2-0.5 mm.
Further preferably, the insulating pad is made of polytetrafluoroethylene.
Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
the utility model provides a permanent magnet motor is through setting up the insulating layer between bearing inner race and the outer periphery of main shaft to set up insulating pad through the both sides face at the bearing, make between bearing and the main shaft insulating mutually, when axle electric current passes through the main shaft, can not flow through the bearing, and then avoid the bearing because of the phenomenon of generating heat that the axle electric current produced flows through, improved the performance of bearing, prolonged the life of bearing.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic axial cross-sectional view of a rotor assembly according to the present invention.
Wherein: 100. a housing; 101. a left end cap; 102. a right end cap; 103. a junction box; 104. a hoisting ring; 200. a stator assembly; 201. a stator core; 300. a rotor assembly; 301. a main shaft; 3011. a shaft shoulder; 302. a rotor core; 3021. rotor punching sheets; 3022. magnetic steel; 303. a bearing; 304. an insulating layer; 305. an insulating pad; 306. a key.
Detailed Description
The technical scheme of the utility model is further explained by the following figures:
as shown in fig. 1, the utility model provides a permanent magnet motor, include: the stator assembly comprises a machine shell 100, a left end cover 101, a right end cover 102, a stator assembly 200 and a rotor assembly 300, wherein the machine shell 100 is a cylindrical shell, the left end cover 101 is detachably fixed at the left end of the machine shell 100, and the right end cover 102 is detachably fixed at the right end of the machine shell 100; the stator assembly 200 is fixed on the inner wall of the machine shell 100, the stator assembly 200 comprises a stator core 201 and windings (not shown in the figure), and the stator assembly 200 is detachably and fixedly connected with the machine shell 100, the left end cover 101 and the right end cover 102; the rotor assembly 300 is inserted into the stator assembly 200, and the rotor assembly 300 includes: the left end of the main shaft 301 penetrates through a through hole in the middle of the left end cover 101, the right end of the main shaft 301 penetrates through a through hole in the middle of the right end cover 102, the rotor core 302 is sleeved on the position, close to the middle, of the main shaft 301, the bearings 303 are sleeved on the main shaft 301 and located on two sides of the rotor core 302, and the left end/right end of the main shaft 301 is rotatably connected in the through holes in the middle of the left end cover 101/right end cover 102 through the bearings 303.
As shown in fig. 2, the rotor assembly 300 further includes an insulating layer 304 between the inner ring of the bearing 303 and the outer circumferential surface of the main shaft 301, and insulating pads 305 on two side surfaces of the bearing 303, wherein the main shaft 301 is a stepped shaft, bearing locations for mounting the bearing 303 are provided at two end portions of the main shaft 301, a shoulder 3011 for abutting against the inner ring of the bearing 303 is provided at a side of the bearing location near the middle portion of the main shaft 301, the rotor core 302 is formed by stacking and fastening by bolts a plurality of rotor sheets 3021, a magnetic steel slot for placing a magnetic steel 3022 is provided on the rotor sheet 3021, the rotor core 302 and the main shaft 301 are connected by a key 306, when the main shaft 301 rotates, the rotor core 302 is driven to rotate, the insulating layer 304 is made of a ceramic material sprayed on the outer circumferential surface of the main shaft 301, when spraying, an adhesive is added to the ceramic material, so, the spraying area is an area on the outer circumferential surface of the main shaft 301, which is in contact with the inner surface of the inner ring of the bearing 303, the insulating pad 305 is sleeved on the main shaft 301, the outer diameter of the insulating pad 305 is larger than the diameter of the shaft shoulder 3011, the thickness of the insulating pad 305 is 0.2-0.5mm, and the insulating pad 305 is made of polytetrafluoroethylene.
The principle of reducing the heat generation amount of the bearing according to the present invention will be described below.
In the permanent magnet motor of the utility model, the inner wall of the inner ring of the bearing 303 is insulated from the main shaft 301 due to the insulating layer 304, the side wall of the inner ring of the bearing 303 close to the middle part of the main shaft 301 is insulated from the shaft shoulder 3011 due to the insulating pad 305, when the left end cover 101/the right end cover 102 are installed, the left end cover 101/the right end cover 102 are only contacted with the outer ring of the bearing 303, in order to prevent the bearing 303 from coming off without contacting with the inner ring of the bearing 303, a stopper for stopping the outer ring of the bearing 303 from contacting with the inner ring of the bearing 303 or the main shaft 301 may be installed on both side surfaces of the left end cover 101/the right end cover 102 to keep the bearing 303 and the main shaft 301 in an insulated state, when the shaft current flows through the main shaft 301, the shaft current is not introduced into the bearing 303, so that the heat generation phenomenon of the bearing caused by the flow of the shaft current is avoided, and the heat generation amount of the bearing is reduced.
The above embodiments are only for illustrating the technical conception and the features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. A permanent magnet electric machine comprising:
a housing;
end covers arranged at two ends of the shell;
the stator assembly is arranged in the shell and comprises a stator core and a winding, and the stator assembly is fixedly connected with the shell and the end cover;
the rotor assembly penetrates through the stator core and comprises a main shaft, a rotor core and bearings, the rotor core is sleeved on the main shaft, the bearings are sleeved on the main shaft and are positioned at two ends of the rotor core, and the main shaft is rotatably connected with the end covers through the bearings;
the method is characterized in that:
an insulating layer is arranged between the inner ring of the bearing and the outer circumferential surface of the main shaft;
and two side surfaces of the bearing are provided with insulating pads.
2. The permanent magnet electric machine of claim 1, wherein: the insulating layer is composed of an insulating material sprayed on the outer circumferential surface of the main shaft.
3. The permanent magnet electric machine of claim 2, wherein: the insulating material is ceramic.
4. The permanent magnet electric machine of claim 2, wherein: and the insulating material is sprayed on the outer circumferential surface of the main shaft in a region which is in contact with the bearing inner ring.
5. The permanent magnet electric machine of claim 1, wherein: the insulating pad is sleeved on the main shaft.
6. The permanent magnet electric machine of claim 5, wherein: the outer diameter of the insulating pad is larger than the diameter of a shaft shoulder on the main shaft for abutting against the bearing.
7. The permanent magnet electric machine of claim 5, wherein: the outer diameter of the insulating pad is larger than that of the bearing inner ring.
8. The permanent magnet electric machine of claim 1, wherein: the thickness of the insulating layer is 0.2-0.5 mm.
9. The permanent magnet electric machine according to any of claims 1-8, characterized in that: the insulating pad is made of polytetrafluoroethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922300774.7U CN210957999U (en) | 2019-12-19 | 2019-12-19 | Permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922300774.7U CN210957999U (en) | 2019-12-19 | 2019-12-19 | Permanent magnet motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210957999U true CN210957999U (en) | 2020-07-07 |
Family
ID=71383064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922300774.7U Active CN210957999U (en) | 2019-12-19 | 2019-12-19 | Permanent magnet motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210957999U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583909A (en) * | 2022-05-09 | 2022-06-03 | 山东信隆机电有限公司 | High-low voltage integrated generator set |
-
2019
- 2019-12-19 CN CN201922300774.7U patent/CN210957999U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583909A (en) * | 2022-05-09 | 2022-06-03 | 山东信隆机电有限公司 | High-low voltage integrated generator set |
| CN114583909B (en) * | 2022-05-09 | 2022-07-12 | 山东信隆机电有限公司 | High-low voltage integrated generator set |
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