CN210201570U - Rotor subassembly, motor and compressor - Google Patents
Rotor subassembly, motor and compressor Download PDFInfo
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- CN210201570U CN210201570U CN201921239184.1U CN201921239184U CN210201570U CN 210201570 U CN210201570 U CN 210201570U CN 201921239184 U CN201921239184 U CN 201921239184U CN 210201570 U CN210201570 U CN 210201570U
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- iron core
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- rotor assembly
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The utility model provides a rotor subassembly, motor and compressor relates to motor technical field. A rotor assembly, comprising: an iron core; the permanent magnets are attached to the outer peripheral surface of the iron core, the outer contour line of the section of each permanent magnet, which is obtained by any plane perpendicular to the axis of the iron core, comprises an inner edge line and an outer edge line, and the distance from the middle part of the outer edge line to the inner edge line is greater than the distance from two end points of the outer edge line to the inner edge line; the outer side surfaces of the plurality of supporting bodies are matched with partial outer side surfaces of the plurality of permanent magnets to form a cylindrical supporting surface; and the fixing sleeve is arranged on the outer sides of the permanent magnet and the support body in a surrounding manner. The utility model provides a rotor subassembly, permanent magnet present for the thick both ends thin not uniform thickness structure in middle. An uneven air gap can be formed between the stator and the stator, so that the distortion rate of the air gap flux density sine wave can be effectively reduced, and the cogging torque is reduced. And the reduction of the cogging torque can reduce the vibration and noise of the motor and improve the performance of the motor.
Description
Technical Field
The utility model relates to a motor field particularly, relates to a rotor subassembly, motor and compressor.
Background
The permanent magnet synchronous motor has the advantages of small volume, light weight, high power density, high efficiency, wide speed regulation range, quick response, high precision, good performance and the like. With the development of high-performance permanent magnet materials and the progress of motor manufacturing technology, permanent magnet motors are widely applied in the application field of high-speed permanent magnet motors, and the fields of electric products, transportation, industry, national defense and the like. Because of slotting and variable frequency power supply of the permanent magnet synchronous motor, an air gap magnetic field between a stator and a rotor of the motor contains a large amount of harmonic waves, and the harmonic effect of air gap flux density can generate cogging torque, so that the motor generates vibration and noise.
SUMMERY OF THE UTILITY MODEL
The utility model provides a rotor subassembly, motor and compressor aims at improving current motor and produces the tooth's socket torque because of the harmonic effect, leads to the motor to produce the problem of vibration and noise.
The utility model discloses a realize like this:
a rotor assembly, comprising:
the outer peripheral surface of the iron core is a cylindrical surface;
the permanent magnets are attached to the outer peripheral surface of the iron core and sequentially arranged along the circumferential direction of the iron core, an outer contour line of a section, which is obtained by cutting any plane perpendicular to the axis of the iron core, of each permanent magnet comprises an inner edge line and an outer edge line, and the distance from the middle of the outer edge line to the inner edge line is greater than the distance from two end points of the outer edge line to the inner edge line in the radial direction of the iron core;
the supporting bodies are arranged between every two adjacent permanent magnets, the outer side surfaces of the supporting bodies are matched with partial outer side surfaces of the permanent magnets to form supporting surfaces, and the supporting surfaces are complete cylindrical surfaces;
the fixed sleeve surrounds the permanent magnet and the outer side of the support body and is attached to the support surface.
Further, in the preferred embodiment of the present invention, the outer edge line includes a middle segment and an extension segment disposed on both sides of the middle segment, the middle segment is an arc line, and the middle segment and the inner edge line are concentrically disposed, each of the extension segments is in the radial direction of the iron core to the distance of the inner edge, and along the extension direction of the extension segment is gradually reduced.
Further, in a preferred embodiment of the present invention, two of the extension sections are symmetrically disposed.
Further, in a preferred embodiment of the present invention, the extension is a circular arc line.
Further, in a preferred embodiment of the present invention, the radius of the middle section is larger than the radius of the extension section.
Further, in the preferred embodiment of the present invention, the orthographic projection of the outer side surface of each support body on any plane perpendicular to the axis of the iron core is an outer support line, the outer support line is an arc line, and two end points of the outer support line are located at the connection between the middle section and the extension section of two adjacent permanent magnets.
Further, in the preferred embodiment of the present invention, two adjacent permanent magnets are disposed at an interval, and each of the inner side surfaces of the supporting bodies is attached to the outer peripheral surface of the iron core and corresponds to the outer side surface of the permanent magnet.
Further, in a preferred embodiment of the present invention, the supporting body is made of a non-magnetic conductive material.
An electric machine comprising a rotor assembly as claimed in any one of the preceding claims.
A compressor comprises the motor.
The utility model has the advantages that: the utility model discloses a rotor subassembly that above-mentioned design obtained because in the footpath of iron core, the middle part of outer edge line is greater than the both ends point to the distance of inner edge line of outer edge line to the distance of inner edge line for the permanent magnet presents the thin not uniform thickness structure in middle thick both ends. The non-uniform air gap can be formed between the permanent magnets with different thicknesses and the stator, so that the distortion rate of the air gap flux density sine wave can be effectively reduced during electromagnetic induction, and the cogging torque is reduced. And the reduction of the cogging torque can reduce the vibration and noise of the motor and improve the performance of the motor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is an exploded view of a rotor assembly according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a rotor assembly according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a permanent magnet in a rotor assembly according to an embodiment of the present invention.
Icon: an iron core 1; a permanent magnet 2; an outer edge line 21; an intermediate section 211; an extension section 212; an inner edge line 22; a support body 3; a fixing sleeve 4.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Embodiment 1, please refer to fig. 1 to 3, this embodiment provides a rotor assembly, including:
the outer peripheral surface of the iron core 1 is a cylindrical surface. The middle part is equipped with the axial extension's shaft hole, and the pivot has been inserted in the shaft hole, and with pivot interference fit. The outer peripheral face of the iron core 1 is provided with a plurality of convex ribs extending along the axis, the convex ribs are arranged at equal intervals, and a magnetic steel groove is formed between every two adjacent convex ribs and used for positioning the pasting of the permanent magnet 2.
The laminating of the outer peripheral face of iron core 1 is provided with a plurality of permanent magnets 2, and a plurality of permanent magnets 2 set gradually along iron core 1's circumference, and correspond and set up in the magnet steel inslot, and during the laminating, be equipped with the rete between the intrados of permanent magnet and iron core 1's the outer peripheral face for fix between permanent magnet 2 and iron core 1.
The outer contour line of a section of each permanent magnet 2 taken by any plane perpendicular to the axis of the core 1 is the same, the outer contour line includes an inner edge line 22 and an outer edge line 21, and the distance from the middle of the outer edge line 21 to the inner edge line 22 in the radial direction of the core 1 is greater than the distance from the two end points of the outer edge line 21 to the inner edge line 22, so that the permanent magnets 2 are in a non-uniform thickness structure with a thick middle and thin ends. The unequal thickness permanent magnets 2 form an uneven air gap with the stator after installation in the machine. When the permanent magnet stator works, electromagnetic induction is formed between the permanent magnet 2 and the stator, and the uneven air gaps can effectively reduce the distortion rate of air gap flux density sine waves, so that the cogging torque is reduced. So that vibration and noise of the motor are reduced.
Every two adjacent permanent magnets 2 are provided with a support body 3, the outer side surfaces of the support bodies 3 are matched with partial outer side surfaces of the permanent magnets 2 to form a support surface, and the support surface is a complete cylindrical surface.
The outer sides of the permanent magnet 2 and the support body 3 are provided with a fixed sleeve 4 in a surrounding mode, and the fixed sleeve 4 is attached to the support surface. In specific implementation, the fixing sleeve 4 is formed by winding a carbon fiber belt or a glass fiber belt outside the permanent magnet 2 and the support body 3. The tape is pre-impregnated with epoxy glue before being wound using carbon fibre tape or glass fibre tape.
Because the fixed sleeve 4 is formed by winding the carbon fiber belt or the glass fiber belt, if the support body 3 is not used, the outer surface of the permanent magnet 2 cannot form a complete cylindrical surface because the permanent magnet 2 is of a non-uniform thickness structure, and the fixed sleeve 4 cannot be completely supported by the permanent magnet 2. Specifically, when the support body 3 is not used, only two positions with thicker middle parts between two adjacent permanent magnets 2 can be in contact with the fixed sleeve 4 to support the fixed sleeve 4, and the fixed sleeve 4 between the two positions is in a suspended state. When the motor rotates at a high speed, the part of the fixed sleeve 4 in a suspended state is more easily bent and deformed under the action of centrifugal force generated by rotation than the part of the fixed sleeve in contact with the permanent magnet 2, and the carbon fiber belt and the glass fiber belt have poor bending resistance, so that the carbon fiber belt or the glass fiber belt is easily broken due to overlarge centrifugal force, and the maximum rotating speed of the motor is limited.
In this embodiment, the supporting bodies 3 are arranged, so that the outer side surfaces of the supporting bodies 3 and the outer side surfaces of the permanent magnets 2 are matched to form a complete cylindrical supporting surface. After the carbon fiber belt or the glass fiber belt is wound to form the fixed sleeve 4, the carbon fiber belt or the glass fiber belt can be completely supported, so that the problem that the maximum rotating speed of the motor is limited due to the fact that the partial region of the fixed sleeve 4 is suspended is avoided.
As can be seen from the above, in the rotor assembly provided in the present embodiment, since the distance from the middle of the outer edge line 21 to the inner edge line 22 is greater than the distance from the two end points of the outer edge line 21 to the inner edge line 22 in the radial direction of the core 1, the permanent magnet 2 has a non-uniform thickness structure with a thick middle and thin two ends. The permanent magnets 2 with different thicknesses can form uneven air gaps with the stator, so that the distortion rate of the air gap flux density sine wave can be effectively reduced when electromagnetic induction is carried out, and the cogging torque is reduced. And the reduction of the cogging torque can reduce the vibration and noise of the motor and improve the performance of the motor.
Further, referring to fig. 2 and fig. 3, in the present embodiment, the outer edge line 21 includes a middle section 211 and extension sections 212 disposed at two sides of the middle section 211. Wherein, the interlude 211 is the circular arc line, specifically, interlude 211 and interior edge line 22 concentric setting. That is, in the radial direction of the inner edge line 22, each point on the intermediate section 211 is equidistant from the inner edge line 22. The distance from each extension 212 to the inner edge in the radial direction of the core 1 gradually decreases along the extension direction of the extension 212. Specifically, the extension 212 may be a straight line or a circular arc line. In this embodiment, extension 212 is the arc line, compares in the straight line, and extension 212 uses the arc line for extension 212 and the excessive position of interlude 211 are gentler, can not cause the interference to the magnetic field between permanent magnet 2 and the stator, have avoided the influence to the motor performance.
Further, referring to fig. 2 and fig. 3, in the present embodiment, the radius of the middle section 211 is greater than the radius of the extension section 212, so that the change rate of the thickness corresponding to the extension section 212 is increased, the thickness difference between the middle position and the two end positions of the permanent magnet 2 is increased, the distortion rate of the air gap flux density sine wave is further reduced, the cogging torque is reduced, and the performance of the motor is further improved. Specifically, in order to reduce the influence on the magnetic field between the permanent magnet 2 and the stator as far as possible while ensuring that the distortion rate of the air gap flux density sine wave is reduced, in the present embodiment, in each permanent magnet 2, two extension sections 212 are symmetrically arranged, and further, the two extension sections 212 have the same radius and are concentrically arranged, that is, the two extension sections 212 are two parts on the same circle.
Further, referring to fig. 2 and fig. 3, in the present embodiment, an orthographic projection of the outer side surface of each support body 3 on any plane perpendicular to the axis of the iron core 1 is an outer support line, the outer support line is an arc line, and two end points of the outer support line are located at a connection position of the middle section 211 and the extension section 212 of two adjacent permanent magnets 2. Meanwhile, the radius of the outer support line is equal to and concentrically arranged with the radius of the middle section 211, that is, the middle section 211 and the outer support line are two portions on the same circle. The outer supporting line of each supporting body 3 and the middle section 211 of each permanent magnet 2 can jointly form a complete circle, and the outer side surface of each supporting body 3 and the outer side surface of each permanent magnet 2 corresponding to the middle section 211 can jointly form a complete cylindrical supporting surface.
Further, referring to fig. 2 and fig. 3, in the present embodiment, two adjacent permanent magnets 2 are disposed at an interval, and an inner side surface of each support 3 is attached to an outer circumferential surface of the iron core 1 and an outer side surface of the corresponding permanent magnet 2. Since the permanent magnets 2 are provided at intervals, a part of the support body 3 comes into contact with the outer peripheral surface of the core 1 in actual use. In this embodiment, the support body 3 is a solid structure, and the inner side surface of the support body 3 is attached to the outer side surface corresponding to the extension section 212 of the corresponding permanent magnet 2, and the outer peripheral surface of the iron core 1, so that the support body 3 can also provide a force pressing the permanent magnet 2 to the iron core 1 while supporting the fixed sleeve 4, and the permanent magnet 2 is prevented from being separated from the iron core 1 when the rotor rotates.
Further, referring to fig. 2 and 3, in the present embodiment, the supporting body 3 is made of a non-magnetic conductive material. The problem that the temperature of the motor is increased due to the eddy effect generated inside the supporting body 3 when the motor works is avoided. Further, the support body 3 is made of a generally used hard plastic. Furthermore, in order to assist the core 1 in dissipating heat, in this embodiment, the supporting body 3 is made of a common rigid plastic with good thermal conductivity. Specifically, polyether sulfone resin and the like can be used.
There is also provided in this embodiment an electric machine comprising an electric machine including a rotor assembly according to any one of the above.
The embodiment also provides a compressor, which comprises the motor.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A rotor assembly, comprising:
the outer peripheral surface of the iron core is a cylindrical surface;
the permanent magnets are attached to the outer peripheral surface of the iron core and sequentially arranged along the circumferential direction of the iron core, an outer contour line of a section, which is obtained by cutting any plane perpendicular to the axis of the iron core, of each permanent magnet comprises an inner edge line and an outer edge line, and the distance from the middle of the outer edge line to the inner edge line is greater than the distance from two end points of the outer edge line to the inner edge line in the radial direction of the iron core;
the supporting bodies are arranged between every two adjacent permanent magnets, the outer side surfaces of the supporting bodies are matched with partial outer side surfaces of the permanent magnets to form supporting surfaces, and the supporting surfaces are complete cylindrical surfaces;
the fixed sleeve surrounds the permanent magnet and the outer side of the support body and is attached to the support surface.
2. The rotor assembly according to claim 1, wherein the outer edge line comprises a middle section and extension sections arranged on two sides of the middle section, the middle section is an arc line, the middle section and the inner edge line are concentrically arranged, and the distance from each extension section to the inner edge in the radial direction of the iron core is gradually reduced along the extension direction of the extension section.
3. The rotor assembly of claim 2 wherein two of the extensions are symmetrically disposed.
4. The rotor assembly of claim 2 wherein the extension is a circular arc.
5. The rotor assembly of claim 4 wherein the radius of the intermediate section is greater than the radius of the extension section.
6. The rotor assembly according to claim 2, wherein an orthographic projection of the outer side surface of each support body on any plane perpendicular to the axis of the iron core is an outer support line, the outer support line is an arc line, and two end points of the outer support line are located at a connecting position of the middle section and the extending section of two adjacent permanent magnets.
7. The rotor assembly of claim 6, wherein two adjacent permanent magnets are arranged at intervals, and the inner side surface of each support body is attached to the outer peripheral surface of the iron core and the outer side surface corresponding to the permanent magnets.
8. The rotor assembly of claim 1 wherein the support body is made of a non-magnetically conductive material.
9. An electrical machine comprising a rotor assembly as claimed in any one of claims 1 to 8.
10. A compressor, characterized in that it comprises an electric machine according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921239184.1U CN210201570U (en) | 2019-07-31 | 2019-07-31 | Rotor subassembly, motor and compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921239184.1U CN210201570U (en) | 2019-07-31 | 2019-07-31 | Rotor subassembly, motor and compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210201570U true CN210201570U (en) | 2020-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921239184.1U Active CN210201570U (en) | 2019-07-31 | 2019-07-31 | Rotor subassembly, motor and compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210201570U (en) |
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2019
- 2019-07-31 CN CN201921239184.1U patent/CN210201570U/en active Active
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