CN107482814B

CN107482814B - Rotor, motor, compressor and air conditioner

Info

Publication number: CN107482814B
Application number: CN201710670307.6A
Authority: CN
Inventors: 高明世; 胡余生; 陈华杰; 陈彬; 张凯
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2017-08-07
Filing date: 2017-08-07
Publication date: 2020-11-03
Anticipated expiration: 2037-08-07
Also published as: CN107482814A

Abstract

The invention provides a rotor, a motor, a compressor and an air conditioner, wherein the rotor comprises: the rotor iron core is provided with a mounting groove; the magnetic piece is arranged in the mounting groove; the connecting structure comprises a first filling part and a fixing part which are connected with each other, the first filling part is arranged in a gap between the magnetic part and the mounting groove, and the fixing part is arranged on the end face of the rotor core. The technical scheme of the invention solves the problem of poor strength of the rotor core in the prior art.

Description

Rotor, motor, compressor and air conditioner

Technical Field

The invention relates to the technical field of refrigeration equipment, in particular to a rotor, a motor, a compressor and an air conditioner.

Background

In the existing permanent magnet synchronous motor and the direct current brushless motor, the structure of a rotor is shown as the problem 1, a magnet 1 'on the rotor is inserted into a magnet groove, a baffle 2' which is not conductive to magnetism is arranged at the end part of a rotor iron core to block the magnet 1 ', and the rotor iron core is axially fixed by using a rivet 3' or a bolt. The structure solves the problem that the magnet 1 'is fixed, reduces the magnetic leakage at the end part of the magnet 1', and strengthens the structural strength of the rotor. However, after the magnet 1' is magnetized, although the magnet does not move in the rotor when being stable, the magnet cannot be guaranteed to completely move in the motor movement process, so that the stability of the rotor is poor. Meanwhile, the magnets 1' move in the gaps during the rotation of the rotor to generate more noise.

In order to solve the problems, in some motors in the prior art, glue is filled between the magnet and the magnet installing groove, and the magnet and the rotor iron core are integrated after the glue is solidified. However, the strength of the rotor core is poor due to the limited adhesion of the glue.

Disclosure of Invention

The invention mainly aims to provide a rotor, a motor, a compressor and an air conditioner, and aims to solve the problem that the strength of a rotor iron core in the prior art is poor.

In order to achieve the above object, according to one aspect of the present invention, there is provided a rotor including: the rotor iron core is provided with a mounting groove; the magnetic piece is arranged in the mounting groove; the connecting structure comprises a first filling part and a fixing part which are connected with each other, the first filling part is arranged in a gap between the magnetic part and the mounting groove, and the fixing part is arranged on the end face of the rotor core.

Further, the fixing part covers the magnetic part.

Further, the mounting groove is a plurality of, and the magnetic part is a plurality of, and a plurality of mounting grooves and a plurality of magnetic part one-to-one set up, and first filling portion is a plurality of, all is provided with first filling portion between every mounting groove and the magnetic part, and the fixed part all is connected with a plurality of first filling portions.

Further, a plurality of mounting grooves are arranged at intervals along the circumferential direction of the rotor core, and the fixing part is of an annular structure.

Furthermore, the fixing parts are multiple, and the fixing parts are correspondingly connected with the first filling parts one by one.

Further, the mounting groove runs through two terminal surfaces of rotor core, and the both ends of first filling portion all are provided with the fixed part.

Furthermore, the rotor core is provided with a first positioning hole, the connecting structure further comprises a second filling part, the second filling part is arranged in the first positioning hole, and the fixing part is connected with the second filling part.

Furthermore, first locating hole is a plurality of, and the second is filled the portion and is a plurality of, all is provided with the second in every first locating hole and fills the portion, and the fixed part all is connected with a plurality of second.

Further, the fixing part, the first filling part and the second filling part are of an integrated structure.

Further, the connecting structure is formed by curing glue, epoxy resin or plastic.

Furthermore, a second positioning hole is formed in the end face of the rotor core, and the rotor further comprises a connecting rivet arranged in the second positioning hole in a penetrating mode.

Further, the rotor core includes a plurality of lamination sheets stacked together.

According to another aspect of the invention, an electric machine is provided, comprising a rotor as described above.

According to another aspect of the present invention, there is provided a compressor, comprising a motor, wherein the motor is the above-mentioned motor.

According to another aspect of the present invention, there is provided an air conditioner including a compressor, the compressor being the above-mentioned compressor.

By applying the technical scheme of the invention, the first filling part is filled in the gap between the mounting groove and the magnetic part, and the fixing part is connected with the first filling part and arranged on the end surface of the rotor core. The above structure allows the first filling portion and the fixing portion to form a rivet-like structure and enhances the strength of the rotor core in the axial direction. Therefore, the technical scheme of the invention solves the problem of poor strength of the rotor core in the prior art.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of a rotor of a prior art electric machine;

FIG. 2 shows a schematic structural view of an embodiment of a rotor according to the present invention;

fig. 3 is a schematic structural view of the rotor core of the rotor of fig. 2 before the first and second filling portions are filled;

fig. 4 is a schematic view showing a structure of the rotor core of the rotor of fig. 2 after being filled with a first filling portion and a second filling portion;

FIG. 5 shows a schematic cross-sectional view of the rotor of FIG. 1;

FIG. 6 shows an enlarged schematic view at A in FIG. 5; and

fig. 7 is a graph showing a comparison of operating noise of a motor using the rotor of fig. 2 and a motor of the related art.

Wherein the figures include the following reference numerals:

1', a magnet; 2', a baffle plate; 3', riveting; 10. a rotor core; 11. mounting grooves; 12. a first positioning hole; 20. a magnetic member; 30. a connecting structure; 31. a first filling part; 32. a fixed part; 33. a second filling part.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. 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.

In the existing permanent magnet synchronous motor and the direct current brushless motor, a motor with magnets inserted in a rotor is generally adopted, and a non-magnetic baffle plate is generally adopted to block the magnets and is axially fixed by rivets or bolts. It has solved the magnetite and has fixed, reduces magnetite tip magnetic leakage, has strengthened the structural strength of rotor. After the magnets are magnetized, although the magnets do not move in the rotor when stable, the magnets cannot be guaranteed to completely move in the motor moving process. Another disadvantage of the interpolated rotor is that the magnetic bridge is weak, easily deformed, and has low reliability, and generates more noise under the action of the air gap magnetic field. In order to solve the above problems, the present application provides a rotor, which has the following specific structure:

as shown in fig. 2 to 4, a rotor of the present embodiment includes a rotor core 10, a magnetic member 20, and a connection structure 30. Wherein, the rotor core 10 is provided with a mounting groove 11. The magnetic member 20 is disposed in the mounting groove 11. The connection structure 30 includes a first filling part 31 and a fixing part 32 connected to each other, the first filling part 31 being disposed in a gap between the magnetic member 20 and the mounting groove 11, and the fixing part 32 being disposed on an end surface of the rotor core 10.

With the solution of the present embodiment, the first filling part 31 is filled in the gap between the mounting groove 11 and the magnetic member 20, while the fixing part 32 is connected to the first filling part 31 and disposed on the end surface of the rotor core 10. The above structure allows the first filling part 31 and the fixing part 32 to form a rivet-like structure and reinforces the strength of the rotor core 10 in the axial direction. Therefore, the technical scheme of the embodiment solves the problem that the strength of the rotor core in the prior art is poor.

It should be noted that, as shown in fig. 2, the rotor core 10 of the present embodiment has a cylindrical structure, and the middle of the rotor core 10 is provided with a mounting through hole for mounting the rotating shaft. The rotor core 10 has an annular side surface and two end surfaces, and the mounting groove 11 is provided on the end surface of the rotor core 10. The fixing portion 32 is connected to the first filling portion 31 and abuts against the end surface of the rotor core 10, thereby reinforcing the axial strength of the rotor core 10.

As shown in fig. 2 and 3, in the solution of the present embodiment, the fixing portion 32 covers the magnetic member 20. Specifically, after the fixing portion 32 is connected to the first filling portion 31, the fixing portion 32 covers the magnetic member 20. That is, the fixing portion 32 covers the opening of the mounting groove 11. The above structure makes the fixing portion 32 simultaneously play a role of preventing the magnetic member 20 from coming out of the mounting groove 11.

As shown in fig. 3, in the technical solution of the present embodiment, there are a plurality of mounting grooves 11, a plurality of magnetic members 20, a plurality of mounting grooves 11 and a plurality of magnetic members 20 are disposed in a one-to-one correspondence manner, a plurality of first filling portions 31 are disposed, a first filling portion 31 is disposed between each mounting groove 11 and the magnetic member 20, and the fixing portion 32 is connected to each of the plurality of first filling portions 31. Specifically, the magnetic member 20 is a magnetic strip. The plurality of mounting grooves 11 are uniformly spaced along the circumferential direction of the rotor core 10. Each mounting groove 11 is provided therein with a magnetic member 20. In order to ensure that the magnetic members 20 in the mounting grooves 11 can be tightly fitted, a first filling portion 31 is filled in a gap between each mounting groove 11 and the magnetic member 20. The fixing portion 32 is connected to each of the first filling portions 31, thereby enhancing the overall strength of the rotor core 10.

Specifically, the mounting groove 11 in the present embodiment is a groove structure for mounting the magnetic member 20, and for the rotor in the related art, the end surface is provided with a plurality of groove structures, some of which are used for mounting the magnets, and some of which are not used for mounting the magnets. The slots for mounting magnets in the multiple slot structure are referred to as mounting slots 11 in this application

As shown in fig. 2 and 3, and fig. 5 and 6, in the solution of the present embodiment, a plurality of mounting grooves 11 are provided at intervals in the circumferential direction of the rotor core 10, and the fixing portion 32 has an annular structure. Specifically, by providing the fixing portion 32 in a ring-shaped structure, the fixing portion 32 can be connected to each of the plurality of first filling portions 31. Preferably, the fixing portion 32 in this embodiment is a ring, and the inner diameter of the ring is larger than the inner diameter of the mounting hole of the rotating shaft, so that the fixing portion 32 is avoided from the mounting position of the rotating shaft. The outer diameter of the ring is adapted to the outer diameter of the rotor core 10 or slightly smaller than the outer diameter of the rotor core 10. Of course, the fixing portion 32 is not necessarily a circular ring structure, and the fixing portion 32 may also enclose a rectangular, diamond, polygonal or irregular ring structure. The shape of the fixing portion 32 may be adjusted according to the arrangement of the plurality of mounting grooves 11.

Further, the fixing portion 32 is not necessarily a single circular ring, for example, in an embodiment not shown, the fixing portion 32 is plural, and the plural fixing portions 32 are connected to the plural first filling portions 31 in a one-to-one correspondence manner. For example, six mounting grooves 11 are provided in the present embodiment, and thus six first filling parts 31 are provided accordingly. Further, the number of the fixing portions 32 is also six, and the six fixing portions 32 and the six first filling portions 31 are connected together in one-to-one correspondence. That is, the fixing portion 32 is provided in plural, not in a ring-shaped configuration.

As shown in fig. 3, in the present embodiment, the mounting groove 11 penetrates both end surfaces of the rotor core 10, and both ends of the first filling part 31 are provided with fixing parts 32. Specifically, both ends of the mounting groove 11 penetrate both end surfaces of the rotor core 10, and both ends of the first filling portion 31 are provided with the fixing portions 32, that is, both the fixing portions 32 are in abutting contact with both end surfaces of the rotor core 10, respectively. The above structure further enhances the axial strength of the rotor core 10.

As shown in fig. 3, in the solution of the present embodiment, the rotor core 10 is provided with a first positioning hole 12, the connection structure 30 further includes a second filling portion 33, the second filling portion 33 is disposed in the first positioning hole 12, and the fixing portion 32 is connected to the second filling portion 33. Specifically, the second filling part 33 and the fixing part 32 form a rivet-like structure, thereby enabling to reinforce the strength of the rotor core 10 in the axial direction.

As shown in fig. 3, in the solution of the present embodiment, there are a plurality of first positioning holes 12, a plurality of second filling portions 33, a second filling portion 33 is disposed in each first positioning hole 12, and the fixing portion 32 is connected to each of the plurality of second filling portions 33. Specifically, in the present embodiment, there are three first positioning holes 12, and accordingly, there are three second filling portions 33, and each first positioning hole 12 is provided therein with a second filling portion 33. The fixing portion 32 has a circular ring structure, and the fixing portion 32 covers the first positioning holes 12, so that the fixing portions 32 are connected to the second filling portions 33. Further, the first positioning hole 12 in the present embodiment penetrates both end surfaces of the rotor core 10, and meanwhile, both ends of the second filling portion 33 are provided with the fixing portions 32, that is, the two fixing portions 32 are respectively provided on both end surfaces of the rotor core 10.

Preferably, the fixing portion 32, the first filling portion 31 and the second filling portion 33 in the present embodiment are an integral structure. Meanwhile, the connection structure 30 is formed by curing glue, epoxy resin or plastic. Specifically, when assembling the magnetic member 20, as shown in fig. 3, the magnetic member 20 is first inserted into the mounting groove 11. As shown in fig. 4, glue, epoxy or plastic is then poured into the gap between the magnetic member 20 and the mounting groove 11, thereby forming a first filling part 31 and a second filling part 33. As shown in fig. 2, glue, epoxy resin, or plastic is then formed into annular fixing portions 32 on both end surfaces of the rotor core 10. Finally, the above materials are cured, and the assembly of the magnetic member 20 is completed.

Another benefit of the above structure is the elimination of fastening structures such as rivets. Of course, the above-described rotor core 10 may be provided with a rivet structure accordingly. For example, in a non-illustrated embodiment, the end face of the rotor core 10 is provided with a second positioning hole, and the rotor further includes a connecting rivet inserted into the second positioning hole. Referring to fig. 3, the second positioning hole may be the first positioning hole 12 of fig. 3, that is, the second filling portion 33 is not disposed in the first positioning hole 12 of fig. 3, but a rivet structure is disposed.

Preferably, in the solution of the present embodiment, the rotor core 10 includes a plurality of lamination sheets stacked together. Specifically, a plurality of punched pieces are stacked together and form the above-described rotor core. Furthermore, holes are formed in positions, corresponding to the mounting groove 11 and the first positioning hole 12, of each punching sheet, so that the mounting groove 11 and the first positioning hole 12 are formed after the punching sheets are stacked together.

The application also provides a motor, which comprises the rotor according to the embodiment of the application.

The application also provides a compressor, which comprises the motor according to the embodiment of the application, wherein the motor is the motor.

The application also provides an air conditioner, wherein the air conditioner comprises a compressor, and the compressor is the compressor.

The applicant has experimentally compared the operating noise of the motor to which the rotor of the present embodiment is applied with the motor of the related art. Experimental results as shown in fig. 7, it can be seen from fig. 7 that the operating noise meditation of the motor to which the rotor of the present embodiment is applied is smaller than that of the motor of the related art.

According to the structure, the rotor of the application has the following characteristics:

this application adopts the technique of plastic envelope or gluey seal or packing, becomes an organic whole with the magnetite and rotor solidification, makes the holistic natural frequency quantity of rotor reduce, and the deflection reduces, reaches fabulous noise reduction effect. Through testing, the partial point can be reduced by 5-6 dB. Meanwhile, the defects of structural strength of the rotor, weakness of the magnetic bridge and fixation of the magnets are overcome. Specifically, the method comprises the following steps:

1. the permanent magnet synchronous motor or the direct current brushless permanent magnet synchronous motor adopts a scheme that magnets are inserted into a rotor. Filling a gap between the magnet and the rotor core with filler, and fastening the magnet and the rotor core into a whole;

2. when the magnet and the rotor are integrated into a whole through bonding or injection molding and filling technology, the natural frequency of the rotor and the amplitude corresponding to the natural frequency are obviously changed, the frequency is obviously improved, the amplitude is obviously reduced, and part of the natural frequency can be eliminated. Therefore, the noise and vibration generated by the rotor under the action of the air gap magnetic field can be reduced;

3. the bonding, injection molding or filling technology needs to use a material with higher rigidity and better integrity after curing as much as possible, so as to better ensure the integrity after filling. The fixed frequency value of 1-6 orders can be effectively improved, the amplitude can be reduced, and the noise can be reduced to the maximum extent. The filling can adopt AB glue, epoxy resin, PBT, PPS and the like;

4. the rotor structure can increase the injection molding and filling holes for enhancing the integrity, for example, the holes are added at the outer side of the rotor magnetic steel groove and the original fastening point position, and after filling, the fillers and the end part rings of the rest magnetic steel grooves are together, so that the structure is more stable. The rotor of the fixed-frequency motor adopts a cast aluminum structure, the integrity of the fixed-frequency motor is good, and the fixed-frequency motor is closely related to low noise of the fixed-frequency motor;

5. before filling, a sheath is required to be arranged on the outer circle of the rotor, an auxiliary shaft is required to be arranged in a shaft hole of the rotor, and all size indexes of the rotor are qualified before and after filling;

6. when high-temperature die casting and injection molding are used, the rotor magnetization needs to be carried out after the process.

The rotor of the present application has the following advantages:

1. effectively reduce the noise of the motor and the compressor, and the reduction effect reaches 3-6 dB. The inner inserting type rotor structure is also a large aspect of noise contribution of the motor and the compressor, and the structure strength is lower, and particularly, the inner inserting type rotor structure contains more and more harmonic air gap magnetic fields under the action of electromagnetic force. The problem of big noise of rotor noise is reduced, also indirect the reduction because of the increase of the complete machine noise that rotor noise vibration arouses. By adopting a curing technology, the magnets, the rotor core, the rivets and the like are integrated, the fixed frequency range of the rotor is changed, the vibration amplitude corresponding to the fixed frequency is reduced, and the purpose of noise reduction is effectively achieved;

2. after the whole is solidified, the structure of a baffle and a rivet is saved, and the purpose of reducing the cost can be achieved;

3. after the whole solidification, the structural strength of the rotor magnetic bridge is obviously enhanced, and the safety factor of the rotor is greatly improved.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

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

1. A rotor, comprising:

the rotor comprises a rotor core (10), wherein a mounting groove (11) is formed in the rotor core (10);

the magnetic piece (20) is arranged in the mounting groove (11);

a connection structure (30), wherein the connection structure (30) comprises a first filling part (31) and a fixing part (32) which are connected with each other, the first filling part (31) is arranged in a gap between the magnetic part (20) and the mounting groove (11), and the fixing part (32) is arranged on the end face of the rotor core (10);

the rotor core (10) is provided with a first positioning hole (12), the connecting structure (30) further comprises a second filling part (33), the second filling part (33) is arranged in the first positioning hole (12), and the fixing part (32) is connected with the second filling part (33); the fixing part (32), the first filling part (31) and the second filling part (33) are of an integral structure;

the number of the mounting grooves (11) is multiple, the number of the magnetic pieces (20) is multiple, the mounting grooves (11) and the magnetic pieces (20) are arranged in a one-to-one correspondence manner, the number of the first filling parts (31) is multiple, and the first filling part (31) is arranged between each mounting groove (11) and each magnetic piece (20);

the number of the fixing parts (32) is multiple, and the fixing parts (32) are correspondingly connected with the first filling parts (31) one by one.

2. The rotor according to claim 1, characterized in that the fixing portion (32) covers the magnetic member (20).

3. The rotor according to claim 1, wherein the mounting groove (11) penetrates both end surfaces of the rotor core (10), and both ends of the first filling part (31) are provided with the fixing parts (32).

4. The rotor as recited in claim 1, characterized in that the connection structure (30) is formed by glue, epoxy or plastic after curing.

5. The rotor according to claim 1, characterized in that a second positioning hole is provided on the end face of the rotor core (10), and the rotor further comprises a connecting rivet inserted in the second positioning hole.

6. The rotor as recited in claim 1, characterized in that the rotor core (10) includes a plurality of laminations stacked together.

7. An electrical machine comprising a rotor, wherein the rotor is as claimed in any one of claims 1 to 6.

8. A compressor comprising an electric motor, wherein said electric motor is as claimed in claim 7.

9. An air conditioner comprising a compressor, wherein said compressor is the compressor of claim 8.