CN211701644U - Motor rotor, motor and compressor - Google Patents

Abstract

The utility model provides a motor rotor, a motor and a compressor, wherein the motor rotor comprises a rotor iron core, a first balance piece and a second balance piece; the rotor core is provided with a first balance hole and a second balance hole, the first balance piece is inserted in the first balance hole, the second balance piece is inserted in the second balance hole, so that the motor rotor can achieve torque balance under the action of the first balance piece and the second balance piece, and the structure that the balance piece is embedded in the rotor core can avoid the increase of the volume of the motor rotor while playing a role of balancing torque, thereby avoiding the increase of the whole volume of the compressor; and the first balance hole and the second balance hole are arranged symmetrically relative to the center line of the rotor core, and the symmetrically arranged balance hole structure can enable an air gap magnetic circuit of the motor with the motor rotor to be symmetrical so as to form symmetrical air gap flux density, so that the motor with the motor rotor can generate balanced magnetic torque.

Description

Motor rotor, motor and compressor

Technical Field

The utility model relates to a compressor technical field particularly, relates to an electric motor rotor, motor and compressor.

Background

At present, for the motor rotor of the scroll compressor with larger eccentric mass in the prior art, the balance weight is arranged to balance the moment.

However, the larger the eccentric amount is, the larger the volume of the balance block is, which causes the overall volume of the compressor to be larger and the manufacturing cost to be increased; moreover, the large volume of the balance block can increase the wind resistance loss, and further reduce the efficiency of the compressor.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an electric motor rotor, an electric motor and a compressor, which can solve the problem of large overall size of the compressor in the prior art.

In order to achieve the above object, according to an aspect of the present invention, there is provided an electric motor rotor including: the rotor comprises a rotor core, wherein a first balance hole and a second balance hole are formed in the rotor core; the first balance piece is inserted in the first balance hole; the second balance piece is inserted in the second balance hole; the first balance holes and the second balance holes extend along the extension direction of the rotor core; the first balance hole and the second balance hole are arranged symmetrically with respect to the center line of the rotor core.

Further, the first balance piece is of a strip-shaped structure, and the cross section of the first balance piece is an arc-shaped surface; the first balancing hole is a strip-shaped hole, and the cross section of the first balancing hole is an arc-shaped surface matched with the cross section of the first balancing piece; and/or the second balance piece is of a strip-shaped structure, and the cross section of the second balance piece is an arc-shaped surface; the second balancing hole is a strip-shaped hole, and the cross section of the second balancing hole is an arc-shaped surface matched with the cross section of the second balancing piece.

Further, in the extension direction of the rotor core, the length of the first balancing member is less than or equal to the length of the first balancing hole, and/or the length of the second balancing member is less than or equal to the length of the second balancing hole, and/or the length of the first balancing member is greater than the length of the second balancing member.

Furthermore, a plurality of circulation holes for the circulation of fluid are formed in the rotor core, the circulation holes are arranged at intervals around the circumference of the rotor core, and each circulation hole penetrates through two ends of the rotor core.

Further, electric motor rotor still includes two baffles, and two baffles set up respectively at rotor core's both ends, have all seted up a plurality of clearing holes on each baffle, and a plurality of clearing holes and a plurality of opening one-to-one ground butt joint of each baffle.

Furthermore, the motor rotor also comprises a main balance block and an auxiliary balance block, wherein the main balance block and the auxiliary balance block are respectively arranged at two ends of the rotor core; the main balance block is arranged opposite to one end of the first balance piece, and the auxiliary balance block is arranged opposite to one end of the second balance piece.

Furthermore, the main balance block and the auxiliary balance block are symmetrically arranged around the center line of the rotor core; the peripheral wall of main balancing piece and the peripheral wall of vice balancing piece all are flushed with rotor core's peripheral wall.

Further, the first balance holes and the second balance holes are arranged in pairs to form a plurality of balance hole groups, and the plurality of balance hole groups are arranged at intervals around the central line of the rotor core; the first balancing member and the second balancing member are arranged in pairs to form a plurality of balancing member groups, and the plurality of balancing member groups and the plurality of balancing hole groups are arranged in one-to-one correspondence.

According to the utility model discloses an on the other hand provides a motor, and this motor is foretell motor rotor including motor rotor and the motor stator of mutually supporting.

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

By applying the technical scheme of the utility model, the motor rotor comprises a rotor core, a first balance piece and a second balance piece; the rotor core is provided with a first balance hole and a second balance hole, the first balance piece is inserted in the first balance hole, and the second balance piece is inserted in the second balance hole; the first balance hole and the second balance hole are formed in the rotor core, the first balance piece and the second balance piece are inserted into the corresponding first balance hole and the second balance hole respectively, so that the motor rotor can achieve torque balance under the action of the first balance piece and the second balance piece, and the torque of the motor rotor is balanced by arranging the balance blocks outside the rotor core; therefore, the motor rotor can solve the problem that the whole volume of the compressor in the prior art is large.

The first balance hole and the second balance hole extend along the extending direction of the rotor core; the first balance hole and the second balance hole are symmetrically arranged relative to the center line of the rotor core, so that the first balance piece inserted in the first balance hole and the second balance piece inserted in the second balance hole are symmetrically arranged relative to the center line of the rotor core, and relative to the asymmetrically arranged balance hole structure, the symmetrically arranged balance hole structure can enable an air gap magnetic circuit of the motor with the motor rotor to be symmetrical to form symmetrical air gap flux density, so that the motor with the motor rotor can generate balanced magnetic moment, and unnecessary vibration and noise of the motor with the motor rotor are avoided.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, 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 view of an alternative electric machine rotor according to the invention;

FIG. 2 shows an exploded view of the rotor of the machine of FIG. 1;

FIG. 3 illustrates a schematic fluid flow diagram of the motor rotor of FIG. 1;

FIG. 4 is a schematic view of the relative arrangement between the first balance mass and the main balance mass of the rotor of the machine of FIG. 1;

FIG. 5 is a schematic view of the relative arrangement between the secondary balance mass and the second balance mass of the rotor of the machine of FIG. 1;

fig. 6 shows a schematic structural view of a first balancing member of the rotor of the electrical machine of fig. 1;

fig. 7 shows a schematic structural view of a second balancing member of the rotor of the electrical machine of fig. 1;

fig. 8 shows an exemplary diagram of an air gap flux density formed by a machine having the machine rotor of fig. 1.

Wherein the figures include the following reference numerals:

100. a motor rotor;

10. a rotor core; 11. a first balance hole; 12. a second balance hole; 13. a flow-through hole; 14. a fastening hole; 15. a magnetic steel hole;

21. a first balance member; 22. a second balance member;

30. a baffle plate; 31. through the hole; 32. a fixing hole;

41. a primary counterbalance; 42. and a secondary balance weight.

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 accompanying drawings in conjunction with embodiments.

The present invention provides a motor rotor 100, please refer to fig. 1 to 7, the motor rotor 100 includes a rotor core 10, a first balance member 21 and a second balance member 22; a first balance hole 11 and a second balance hole 12 are formed in the rotor core 10, the first balance piece 21 is inserted into the first balance hole 11, and the second balance piece 22 is inserted into the second balance hole 12; wherein, the first balance hole 11 and the second balance hole 12 both extend along the extending direction of the rotor core 10; the first balance hole 11 and the second balance hole 12 are arranged to be centrosymmetric with respect to the center line of the rotor core 10.

The utility model discloses an in electric motor rotor 100, through set up first balancing hole 11 and second balancing hole 12 on rotor core 10, and make first balancing piece 21 and second balancing piece 22 insert respectively and establish in corresponding first balancing hole 11 and second balancing hole 12, so that electric motor rotor 100 reaches moment balance under the effect of first balancing piece 21 and second balancing piece 22, for setting up the balancing piece outside rotor core 10 and make electric motor rotor's moment reach the balance, this kind sets up the structure of embedding balancing piece in rotor core 10 when playing the effect of balancing moment, can also avoid electric motor rotor 100's volume increase, also can avoid electric motor rotor 100's weight increase, and then avoid the whole volume increase of the compressor that has the motor including electric motor rotor 100; it can be seen that the motor rotor 100 can solve the problem of the large overall size of the compressor in the prior art. The whole volume of the compressor is reduced, so that the occupied space of the compressor is reduced, and the miniaturization development of the compressor is facilitated.

Also, the first balance holes 11 and the second balance holes 12 are arranged symmetrically with respect to the center line of the rotor core 10 such that the first balance members 21 inserted into the first balance holes 11 and the second balance members 22 inserted into the second balance holes 12 are arranged symmetrically with respect to the center line of the rotor core 10, as shown in fig. 8, with respect to the asymmetrically arranged balance hole structure, such symmetrically arranged balance hole structure can make the air gap magnetic circuit of the motor having the motor rotor 100 symmetrical to form a symmetrical air gap flux density, thereby enabling the motor having the motor rotor 100 to generate a balanced magnetic moment to prevent the motor having the motor rotor 100 from generating unnecessary vibration and noise.

The air-gap magnetic density map in fig. 8 is an air-gap magnetic density map of an air-gap portion of a motor having a motor rotor 100, which is obtained by using ansoft electromagnetic simulation software, the abscissa in the map is the radial direction of a rotor core 10 of the motor, the arc lengths of different portions on one of concentric circles between the motor rotor 100 and a stator of the motor, the center of the concentric circle is located on the axis of the rotor core 10, and the ordinate in the map is the air-gap magnetic density between the motor rotor 100 and the stator thereof corresponding to different arc lengths.

It should be noted that the first balance hole 11 and the second balance hole 12 are arranged symmetrically with respect to the center line of the rotor core 10, that is, the first balance hole 11 can be overlapped with the second balance hole 12 after rotating 180 degrees, and the second balance hole 12 can be overlapped with the first balance hole 11 after rotating 180 degrees.

Specifically, the first balance member 21 is a bar-shaped structure, and the cross section of the first balance member 21 is an arc-shaped surface; the first balance hole 11 is a strip-shaped hole, and the cross section of the first balance hole 11 is an arc-shaped surface matched with the cross section of the first balance piece 21; and/or the second balance piece 22 is a strip-shaped structure, and the cross section of the second balance piece 22 is an arc-shaped surface; the second balance hole 12 is a strip-shaped hole, and the cross section of the second balance hole 12 is an arc-shaped surface matched with the cross section of the second balance piece 22. Optionally, the cross section of the first balance hole 11 and the cross section of the second balance hole 12 are the same in shape and size; the first balance member 21 and the second balance member 22 are made of a non-magnetic material.

Wherein, the cross section of the first balance member 21 is a section of the first balance member 21 perpendicular to the extending direction thereof, the cross section of the second balance member 22 is a section of the second balance member 22 perpendicular to the extending direction thereof, and the extending direction of the first balance member 21 and the extending direction of the second balance member 22 are the same as the extending direction of the rotor core 10; the cross section of the first balance hole 11 is a section of an inner wall of the first balance hole 11 perpendicular to the extending direction thereof, and the cross section of the second balance hole 12 is a section of an inner wall of the second balance hole 12 perpendicular to the extending direction thereof.

In the present embodiment, the length of the first balance member 21 is less than or equal to the length of the first balance hole 11 along the extending direction of the rotor core 10, so as to prevent the first balance member 21 from protruding out of the rotor core 10; and/or the length of the second balancing member 22 is less than or equal to the length of the second balancing hole 12 to prevent the second balancing member 22 from protruding out of the rotor core 10; and/or, the length of the first balancing member 21 is greater than that of the second balancing member 22, so that the motor rotor 100 can form the maximum eccentric moment and meet the moment balance requirement of the motor rotor 100 under the condition of the maximum eccentric moment.

Alternatively, the first balance hole 11 and the second balance hole 12 both penetrate both ends of the rotor core 10, so that when the first balance member 21 is not inserted in the first balance hole 11 and the second balance member 22 is not inserted in the second balance hole 12, the first balance hole 11 and the second balance hole 12 can also serve as passages through which the fluid flows.

In order to stably insert the first balance member 21 and the second balance member 22 into the first balance hole 11 and the second balance hole 12, respectively, after the first balance member 21 and the second balance member 22 are inserted into the first balance hole 11 and the second balance hole 12, respectively, the first balance member 21 and the second balance member 22 may be die-cast on the inner walls of the first balance hole 11 and the second balance hole 12, respectively, by die-casting, so as to prevent the first balance member 21 and the second balance member 22 from moving relative to the rotor core 10 during the rotation of the rotor core 10 and to make the overall structure of the motor rotor 100 stronger.

In the present embodiment, as shown in fig. 1, 2, and 3, a plurality of circulation holes 13 through which fluid flows are opened in the rotor core 10, the plurality of circulation holes 13 are provided at intervals around the circumferential direction of the rotor core 10, and the respective circulation holes 13 penetrate both ends of the rotor core 10. The circulation area of the refrigerant in the shell of the compressor can be increased by arranging the circulation holes 13, the circulation path of the refrigerant is improved, the circulation resistance of the refrigerant in the compressor is reduced, the overall circulation efficiency of the refrigerant is further improved, and the compressor with the motor rotor is used in an air conditioning unit, so that the refrigeration efficiency of the air conditioning unit is improved; in addition, the arrangement of the circulation holes 13 can reduce the impact of high-pressure gas in the compressor on the rotor so as to reduce vibration and noise. Alternatively, the cross section of each flow hole 13 is an arc-shaped surface, and the cross section of each flow hole 13 is the same as the cross section of the first balance hole 11 and the cross section of the second balance hole 12 in shape and size. Preferably, the plurality of circulation holes 13 are uniformly arranged around the circumference of the rotor core 10.

In this embodiment, the motor rotor 100 further includes two baffles 30, the two baffles 30 are respectively disposed at two ends of the rotor core 10, each baffle 30 has a plurality of through holes 31, the through holes 31 of each baffle 30 are in one-to-one butt joint with the through holes 13, so that two ends of each through hole 13 are respectively communicated with the corresponding through holes 31 of the two baffles 30. Optionally, the two baffle plates 30 are both annular plates, and the peripheral walls of the two baffle plates 30 are flush with the peripheral wall of the rotor core 10, so that the overall structure of the motor rotor 100 is relatively compact and regular.

In order to realize the assembly between the two baffles 30 and the rotor core 10, a plurality of fastening holes 14 are formed in the rotor core 10, the fastening holes 14 are arranged around the circumference of the rotor core 10 at intervals, and each fastening hole 14 penetrates through two ends of the rotor core 10; each baffle 30 is provided with a plurality of fixing holes 32, and the plurality of fixing holes 32 of each baffle 30 and the plurality of fastening holes 14 are arranged in a one-to-one correspondence manner, so that the two baffles 30 and the rotor core 10 are relatively fixed by penetrating fasteners into the corresponding fastening holes 14 and the corresponding fixing holes 32 of the two baffles 30.

In this embodiment, the motor rotor 100 further includes a main balance weight 41 and an auxiliary balance weight 42, where the main balance weight 41 and the auxiliary balance weight 42 are respectively disposed at two ends of the rotor core 10; the primary weight 41 is disposed opposite to one end of the first balance member 21, and the secondary weight 42 is disposed opposite to one end of the second balance member 22. Even if the motor rotor 100 balances the torque of the motor rotor 100 under the combined action of the paired balance pieces and the paired balance blocks, compared with the situation that the motor rotor of the compressor with larger eccentric amount reaches the torque balance only by increasing the balance blocks in the prior art, the motor rotor 100 of the compressor with larger eccentric amount reaches the same torque balance effect by using the balance pieces and the balance blocks in the application together, the motor rotor 100 has smaller volume and lighter weight, so that the whole volume of the compressor with the motor comprising the motor rotor 100 is smaller, and the problem that the whole volume of the compressor in the prior art is larger can be solved; meanwhile, manufacturing materials and manufacturing cost can be saved, and machining efficiency is improved.

In addition, the volume reduction of the main balance weight 41 and the auxiliary balance weight 42 can reduce the wind resistance loss of the motor, and is beneficial to improving the efficiency of the motor; in addition, the overall length of the motor rotor 100 is reduced due to the reduced volume of the main balance weight 41 and the auxiliary balance weight 42, which is beneficial to reducing the rotational inertia moment of the motor and improving the starting performance of the motor. Wherein, the overall length of the motor rotor 100 is the length of the motor rotor 100 along the extending direction thereof.

Specifically, the main weight 41 and the sub weight 42 are respectively provided on the two baffles 30, so that the main weight 41 and the sub weight 42 are provided at both ends of the rotor core 10 through the respective baffles 30.

Specifically, the main balance weight 41 and the sub-balance weight 42 are symmetrically disposed around the center line of the rotor core 10; the peripheral wall of the main balance weight 41 and the peripheral wall of the auxiliary balance weight 42 are flush with the peripheral wall of the corresponding baffle 30, even if the peripheral walls of the main balance weight 41 and the auxiliary balance weight 42 are flush with the peripheral wall of the rotor core 10, the whole structure of the motor rotor 100 is compact and regular.

Specifically, the main balance weight 41 and the auxiliary balance weight 42 are respectively provided with a connecting hole so as to be inserted into the corresponding connecting holes of the main balance weight 41 and the auxiliary balance weight 42 through the fasteners, so that the main balance weight 41 and the auxiliary balance weight 42 are both fixed relative to the two baffles 30.

Optionally, the main balance weight 41 includes a first plate body and a second plate body, the first plate body is a planar plate structure, the second plate body is an arc-shaped plate structure, and the second plate body is disposed on the first plate body, so that a step structure is formed between an inner wall surface of the second plate body and a plate surface of the first plate body, which is close to the second plate body; wherein, the inner wall surface of the second plate body is the wall surface on one side of the bending direction; the attachment hole of the main weight 41 is provided on the first plate body.

The auxiliary balance block 42 includes a third plate body and a fourth plate body, the third plate body is of a planar plate structure, the fourth plate body is of an arc-shaped plate structure, and the fourth plate body is arranged on the third plate body, so that a step structure is formed between the inner wall surface of the fourth plate body and the plate surface of the third plate body, which is close to the fourth plate body; wherein, the inner wall surface of the fourth plate body is the wall surface on one side of the bending direction; the coupling hole of the sub-weight 42 is provided on the third plate body.

Specifically, the first balance holes 11 and the second balance holes 12 are provided in pairs to form a plurality of balance hole groups, which are arranged at intervals around the center line of the rotor core 10; the first balancing members 21 and the second balancing members 22 are arranged in pairs to form a plurality of balancing member groups, and the plurality of balancing member groups are arranged in one-to-one correspondence with the plurality of balancing hole groups, so that the first balancing members 21 in each balancing member group are inserted into the first balancing holes 11 in the corresponding balancing hole group, and the second balancing members 22 in each balancing member group are inserted into the second balancing holes 12 in the corresponding balancing hole group. Preferably, the plurality of balance hole groups are uniformly arranged around the center line of the rotor core 10.

In this embodiment, the rotor core 10 is further provided with a plurality of magnetic steel holes 15 for inserting magnetic steel, and the plurality of magnetic steel holes 15 are arranged at intervals around the circumference of the rotor core 10. Optionally, there are two magnet steel holes 15, and the two magnet steel holes 15 are symmetrically arranged around the central line of the rotor core 10. Specifically, the magnetic steel hole 15 is a rectangular hole.

The utility model also provides a motor, this motor is foretell electric motor rotor 100 including electric motor rotor and the electric motor stator of mutually supporting, this electric motor rotor.

The utility model also provides a compressor, this compressor is including the above-mentioned motor that has electric motor rotor 100.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

in the motor rotor 100 of the present invention, the motor rotor 100 includes a rotor core 10, a first balance member 21, and a second balance member 22; a first balance hole 11 and a second balance hole 12 are formed in the rotor core 10, the first balance piece 21 is inserted into the first balance hole 11, and the second balance piece 22 is inserted into the second balance hole 12; namely, the first balance hole 11 and the second balance hole 12 are arranged on the rotor core 10, and the first balance piece 21 and the second balance piece 22 are respectively inserted into the corresponding first balance hole 11 and the second balance hole 12, so that the motor rotor 100 can achieve torque balance under the action of the first balance piece 21 and the second balance piece 22, and the torque of the motor rotor can be balanced by arranging the balance blocks outside the rotor core 10, and the structure that the balance pieces are embedded in the rotor core 10 can avoid the volume increase of the motor rotor 100, the weight increase of the motor rotor 100 and the whole volume increase of the compressor while playing a role of balancing the torque; it can be seen that the motor rotor 100 can solve the problem of the large overall size of the compressor in the prior art.

Also, the first balance hole 11 and the second balance hole 12 each extend in the extending direction of the rotor core 10; the first balance hole 11 and the second balance hole 12 are symmetrically disposed with respect to the center line of the rotor core 10 such that the first balance member 21 inserted into the first balance hole 11 and the second balance member 22 inserted into the second balance hole 12 are symmetrically disposed with respect to the center line of the rotor core 10, and such symmetrically disposed balance hole structures enable the air-gap magnetic circuit of the motor having the motor rotor 100 to be symmetrical with respect to the asymmetrically disposed balance hole structure to form a symmetrical air-gap flux density, thereby enabling the motor having the motor rotor 100 to generate a balanced magnetic moment to prevent the motor having the motor rotor 100 from generating unnecessary vibration and noise.

The utility model discloses a motor includes electric motor rotor 100, so this motor has the same technological effect with electric motor rotor 100 at least.

The utility model discloses a compressor is including the above-mentioned motor that has electric motor rotor 100, so this compressor has at least the same technological effect with electric motor rotor 100.

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 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.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

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. An electric machine rotor, comprising:

the rotor comprises a rotor core (10), wherein a first balance hole (11) and a second balance hole (12) are formed in the rotor core (10);

a first balancing member (21), the first balancing member (21) being inserted in the first balancing hole (11);

a second balancing member (22), the second balancing member (22) being inserted in the second balancing hole (12);

wherein the first balancing hole (11) and the second balancing hole (12) each extend in an extension direction of the rotor core (10); the first balance hole (11) and the second balance hole (12) are arranged in a central symmetry manner with respect to a center line of the rotor core (10).

2. The electric machine rotor according to claim 1, characterized in that the first balancing member (21) is a bar-shaped structure, the cross section of the first balancing member (21) being an arc-shaped surface; the first balance hole (11) is a strip-shaped hole, and the cross section of the first balance hole (11) is an arc-shaped surface matched with the cross section of the first balance piece (21); and/or

The second balance piece (22) is of a strip-shaped structure, and the cross section of the second balance piece (22) is an arc-shaped surface; the second balance hole (12) is a strip-shaped hole, and the cross section of the second balance hole (12) is an arc-shaped surface matched with the cross section of the second balance piece (22).

3. An electric machine rotor according to claim 1, characterized in that the length of the first balancing member (21) is smaller than or equal to the length of the first balancing hole (11), and/or the length of the second balancing member (22) is smaller than or equal to the length of the second balancing hole (12), and/or the length of the first balancing member (21) is larger than the length of the second balancing member (22), in the extension direction of the rotor core (10).

4. The motor rotor according to claim 1, wherein a plurality of circulation holes (13) through which fluid flows are formed in the rotor core (10), the plurality of circulation holes (13) are arranged at intervals around the circumferential direction of the rotor core (10), and each of the circulation holes (13) penetrates both ends of the rotor core (10).

5. The electric machine rotor as recited in claim 4, further comprising:

the two baffles (30) are respectively arranged at two ends of the rotor core (10), a plurality of through holes (31) are formed in each baffle (30), and the through holes (31) of each baffle (30) are in butt joint with the circulation holes (13) in a one-to-one correspondence mode.

6. The electric machine rotor as recited in claim 1, further comprising:

the rotor comprises a main balance weight (41) and an auxiliary balance weight (42), wherein the main balance weight (41) and the auxiliary balance weight (42) are respectively arranged at two ends of the rotor core (10);

wherein the main balance weight (41) is arranged opposite to one end of the first balance piece (21), and the auxiliary balance weight (42) is arranged opposite to one end of the second balance piece (22).

7. The electric machine rotor according to claim 6, characterized in that the primary weight (41) and the secondary weight (42) are symmetrically arranged around the center line of the rotor core (10); the peripheral wall of the main balance weight (41) and the peripheral wall of the auxiliary balance weight (42) are flush with the peripheral wall of the rotor core (10).

8. An electric machine rotor according to claim 1, characterized in that the first balance holes (11) and the second balance holes (12) are provided in pairs to form a plurality of balance hole groups arranged at intervals around a center line of the rotor core (10);

the first balancing member (21) and the second balancing member (22) are arranged in pairs to form a plurality of balancing member groups, and the plurality of balancing member groups are arranged in one-to-one correspondence with the plurality of balancing hole groups.

9. An electrical machine comprising a machine rotor and a machine stator which cooperate with each other, characterized in that the machine rotor is a machine rotor according to any of claims 1-8.

10. A compressor comprising an electric motor, wherein said electric motor is as claimed in claim 9.

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