CN217935236U

CN217935236U - Rotor, motor and compressor

Info

Publication number: CN217935236U
Application number: CN202222286381.7U
Authority: CN
Inventors: 艾程柳; 黄刚
Original assignee: Anhui Meizhi Compressor Co Ltd
Current assignee: Anhui Meizhi Compressor Co Ltd
Priority date: 2022-08-29
Filing date: 2022-08-29
Publication date: 2022-11-29
Anticipated expiration: 2032-08-29

Abstract

The application provides a rotor, a motor and a compressor. The rotor comprises a first rotor iron core, a second rotor iron core, a plurality of first permanent magnets and a plurality of second permanent magnets, the first permanent magnets are annularly arrayed on the periphery of the first rotor iron core, the second rotor iron core is arranged between every two adjacent first permanent magnets, mounting holes are formed between each second rotor iron core and the first rotor iron core at intervals, and the second permanent magnets are filled in the mounting holes; each first permanent magnet is magnetized in the circumferential direction, each second permanent magnet is magnetized in the radial direction, and the magnetizing directions of two adjacent first permanent magnets are opposite. The application provides a rotor sets up through second rotor core and the first rotor core interval between two adjacent first permanent magnets to form the mounting hole, and fill installation second permanent magnet in the mounting hole, block the magnetic leakage of the side to first rotor core of second permanent magnet through the second permanent magnet, in order to promote the output magnetic field intensity of this rotor.

Description

Rotor, motor and compressor

Technical Field

The application belongs to the technical field of motors, and particularly relates to a rotor, a motor and a compressor.

Background

The rotor of the current permanent magnet motor, especially the rotor of the ferrite permanent magnet motor, usually adopts a Spoke (Spoke) structure. According to the rotor structure, the mounting holes are formed in the rotor core to mount the permanent magnets, the two sides of the radial inner side end of each mounting hole extend towards the direction close to the mounting hole to form the circulation holes, the two adjacent circulation holes are arranged at intervals, a support beam is formed between the two adjacent circulation holes, the structural strength of the rotor core is guaranteed, and the arrangement of the circulation holes can reduce magnetic leakage. However, due to the arrangement of the support beam, a leakage magnetic path is provided between adjacent poles of the permanent magnet, so that the amplitude of the air-gap magnetic field is attenuated.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a rotor, a motor and a compressor, so as to solve the problem that in the prior art, a support beam between circulation holes at the inner side end of a permanent magnet mounting hole of a rotor core generates magnetic flux leakage to attenuate the amplitude of an air gap magnetic field.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions: providing a rotor, which comprises a first rotor core, a second rotor core, a plurality of first permanent magnets and a plurality of second permanent magnets, wherein a rotating shaft hole is formed in the first rotor core, the plurality of first permanent magnets are annularly arrayed on the periphery of the first rotor core, the second rotor core is arranged between every two adjacent first permanent magnets, each second rotor core and the first rotor core are arranged at intervals, each second rotor core, the first rotor core and two first permanent magnets adjacent to the second rotor core jointly enclose a mounting hole, and the second permanent magnets are filled in each mounting hole; each first permanent magnet is magnetized in the circumferential direction, each second permanent magnet is magnetized in the radial direction, and the magnetizing directions of the two adjacent first permanent magnets are opposite.

In an optional embodiment, the magnetizing directions of two adjacent second permanent magnets are opposite; two adjacent second permanent magnets: the magnetizing directions of the second permanent magnet and the two first permanent magnets adjacent to the second permanent magnet face towards the adjacent second rotor core, and the magnetizing directions of the other second permanent magnet and the two first permanent magnets adjacent to the second permanent magnet face away from the adjacent second rotor core.

In an optional embodiment, two opposite sides of each second permanent magnet are respectively provided with an accommodating groove, and corners of one end of each first permanent magnet close to the first rotor core are matched and extend into the adjacent accommodating grooves.

In an optional embodiment, a connection surface of the first rotor core and the first permanent magnet is a plane, and a connection surface of the first rotor core and the second permanent magnet is a plane.

In an alternative embodiment, the connection surface of the second permanent magnet and the second rotor core is a plane.

In an alternative embodiment, the outer side surface of each of the second rotor cores is arc-shaped.

In an optional embodiment, two opposite sides of the outer end of each second rotor core are respectively provided with a positioning protrusion which abuts against and positions the first permanent magnet along the circumferential direction of the first rotor core.

In an alternative embodiment, each of the first permanent magnets has a rectangular cross-section.

In an optional embodiment, the rotor further includes two cover plates respectively disposed at two axial ends of the first rotor core and a plurality of connecting members connecting the two cover plates, each of the second rotor cores, each of the first permanent magnets and each of the second permanent magnets are disposed between the two cover plates, a through hole for the connecting member to pass through is formed in the second rotor core along the axial direction of the rotating shaft hole, and an opening is formed in each of the cover plates at a position corresponding to the rotating shaft hole.

In an optional embodiment, a plurality of elastic sheets are convexly arranged on at least one cover plate in the direction towards another cover plate.

It is another object of an embodiment of the present application to provide an electric machine including a stator and a rotor as in the previous embodiment, the rotor being mounted in the stator.

It is a further object of an embodiment of the present application to provide a compressor including a motor as in the above embodiments.

The rotor that this application embodiment provided has: compared with the prior art, the rotor of this application embodiment sets up through second rotor core and the first rotor core interval between two adjacent first permanent magnets to form the mounting hole, and fill installation second permanent magnet in the mounting hole, in order to block the side of second permanent magnet to the magnetic leakage of first rotor core through the second permanent magnet, in order to promote the output magnetic field intensity of this rotor.

The motor that this application embodiment provided has: compared with the prior art, the motor of this application embodiment has used the rotor of above-mentioned embodiment, can guarantee the less magnetic leakage of rotor, promotes the output magnetic field intensity of rotor, and then promotes the air gap magnetic field amplitude intensity of motor, promotes the output power and the efficiency of motor.

The beneficial effect of the compressor that this application embodiment provided lies in: compared with the prior art, the compressor of the embodiment of the application uses the motor of the embodiment, has the beneficial effects of the motor, and is not repeated herein.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the embodiments or exemplary technical descriptions will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings may be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of a motor in the related art;

fig. 2 is a schematic view of magnetic lines of force of a partial region of a motor in the related art;

FIG. 3 is a schematic structural diagram of a rotor provided in an embodiment of the present application;

FIG. 4 is a schematic structural view of the stator of FIG. 3;

FIG. 5 is a schematic perspective view of the rotor of FIG. 3;

FIG. 6 is a schematic cross-sectional view of the rotor of FIG. 5 taken perpendicular to the axial direction of the rotor;

fig. 7 is an enlarged cross-sectional view of the first rotor core of fig. 6;

FIG. 8 is an enlarged cross-sectional view of the second permanent magnet of FIG. 6;

fig. 9 is a schematic view of magnetic lines of force of a partial region of a motor provided in an embodiment of the present application.

Wherein, in the figures, the various reference numbers are given by way of example only:

100-a motor;

10-a stator; 101-stator bore; 11-a stator core; 111-stator yoke; 112-stator teeth; 113-stator slots; 12-winding;

20-a rotor; 21-a first rotor core; 211-rotating shaft hole; 22-a second rotor core; 221-positioning convex; 222-a via hole; 23-a first permanent magnet; 24-a second permanent magnet; 241-a containing groove; 25-a cover plate; 251-opening a hole; 252-a spring plate; 253-an opening; 26-connecting piece.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. The meaning of "a number" is one or more unless specifically limited otherwise. 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. The terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered limiting of the application.

In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; 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 application can be understood by those of ordinary skill in the art as appropriate.

Reference throughout this specification to "one embodiment," "some embodiments," or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Referring to fig. 1 and 2, a permanent magnet motor 900 in the related art is shown. The permanent magnet motor 900 includes a stator 910 and a rotor 920, and the rotor 920 is installed in the stator 910 such that the stator 910 drives the rotor 920 to rotate. The rotor 920 includes a rotor core 921 and a permanent magnet 922, a mounting hole 9210 is provided in the rotor core 921, and the permanent magnet 922 is mounted in the mounting hole 9210 to fix the permanent magnet 922 in the rotor core 921. Permanent magnets 922 are arranged circumferentially magnetized to form a spoke-like structure. In the radial direction of the rotor 920, an end closer to the axis of the rotor 920 is an inner end, and an end closer to the outer side of the rotor 920 is an outer end. In order to reduce the leakage of magnetic flux, flow holes 9211 are provided on opposite sides of the inner ends of the mounting holes 9210, the flow holes 9211 on one side of each mounting hole 9210 extend in the direction of the adjacent mounting hole 9210, that is, the flow holes 9211 are provided in opposite sides of the inner ends of the mounting holes 9210 in the direction of the adjacent mounting hole 9210, and the flow holes 9211 are generally empty to block the passage of magnetic flux lines, thereby reducing the leakage of magnetic flux. However, when the adjacent two flow holes 9211 communicate with each other, the strength of the rotor core 921 is too low, and thus the support beams 9212 are formed at intervals between the two flow holes 9211. Due to the arrangement of the supporting beam 9212, the magnetic force lines of the magnetic field generated by the permanent magnet 922 pass through the supporting beam 9212 to generate magnetic flux leakage, that is, the magnetic force lines of the magnetic field do not reach the stator 910, so that the utilization rate of the magnetic field of the rotor 920 is reduced, and the amplitude of the air-gap magnetic field is attenuated.

Based on the problem, the supporting beam structure is eliminated, the permanent magnet is arranged in the flow through hole, the structural strength of the rotor is enhanced, and the magnetic leakage of the permanent magnet is forcibly blocked through the permanent magnet, so that the utilization rate of a magnetic field is improved.

Referring to fig. 3 and 6, a motor 100 provided herein will now be described. The motor 100 includes a stator 10 and a rotor 20, wherein the rotor 20 is mounted in the stator 10, and the rotor 20 is driven to rotate by the stator 10.

Referring to fig. 3 and 4, the stator 10 includes a stator core 11, the stator core 11 includes a plurality of stator teeth 112 and a stator yoke 111 supporting the plurality of stator teeth 112, and the plurality of stator teeth 112 surround a stator inner hole 101 to mount the rotor 20 in the stator inner hole 101. Stator slots 113 are formed between two adjacent stator teeth 112, the winding 12 is wound on the stator teeth 112, and the winding 12 is located in the stator slots 113. In the present embodiment, the number of the stator slots 113 is six, but it is understood that the number of the stator slots 113 may be other.

Alternatively, the stator 10 may be nested in a housing made of iron, aluminum, or the like, to secure the stator 10. Of course, the housing may be made of plastic or the like. It will be appreciated that the housing may also be injection molded as a unitary structure with the stator 10. The rotor 20 may be fixed to the housing by a bearing, so that the rotor 20 is coaxially disposed with the stator 10, and the stator 10 drives the rotor 20 to rotate smoothly. It will be appreciated that, in use, the stator 10 and rotor 20 may be mounted directly in the application without a housing.

Stator core 11 can adopt stator punching to range upon range of formation to reduce stator core 11's iron loss, promote output torque and efficiency. The stator punching sheet can be made of silicon steel sheets so as to reduce cost.

Referring to fig. 3 and 6, the rotor 20 includes a first rotor core 21, a second rotor core 22, a plurality of first permanent magnets 23, and a plurality of second permanent magnets 24, the number of the second rotor cores 22 is the same as that of the first permanent magnets 23, and the second rotor cores 22 correspond to the first permanent magnets 23 one by one. The number of the second permanent magnets 24 is the same as that of the first permanent magnets 23, and the second permanent magnets 24 correspond to the first permanent magnets 23 one by one.

The first rotor core 21 is provided with a rotating shaft hole 211, and when in use, the rotating shaft can be inserted into the rotating shaft hole 211 to mount the first rotor core 21 on the rotating shaft, and then mount the rotor 20 on the rotating shaft, so that the rotor 20 drives the rotating shaft to rotate.

For convenience of description, define: in the radial direction of the rotor 20, one end closer to the axial center of the rotor 20 is an inner end, and one end closer to the outer side of the rotor 20 is an outer end.

Each first permanent magnet 23 is mounted on a side surface of the first rotor core 21, and the plurality of first permanent magnets 23 are arranged in an annular array with the axis of the rotating shaft hole 211 as a central axis, that is, the plurality of first permanent magnets 23 are arranged in an annular array on the peripheral side of the first rotor core 21. Second rotor core 22 is disposed between two adjacent first permanent magnets 23, so that two opposite sides of each second rotor core 22 are connected to two first permanent magnets 23, and since the plurality of first permanent magnets 23 are arranged in an annular array, the plurality of second rotor cores 22 are also arranged in an annular array, or in other words, the first permanent magnets 23 are disposed between two second rotor cores 22.

Each second rotor core 22 and the first rotor core 21 are disposed at an interval, and since two adjacent first permanent magnets 23 are separated by the second rotor core 22 between the two adjacent first permanent magnets 23, each second rotor core 22, the first rotor core 21, and two first permanent magnets 23 adjacent to the second rotor core 22 together enclose a mounting hole (not shown), that is, two adjacent first permanent magnets 23, the second rotor core 22 between the two adjacent first permanent magnets 23, and the first rotor core 21 together enclose a mounting hole, the mounting hole is located between the corresponding second rotor core 22 and the corresponding first rotor core 21, a plurality of mounting holes are formed between the plurality of second rotor cores 22 and the corresponding first rotor core 21, the number of the mounting holes is equal to the number of the second rotor cores 22, and the mounting holes and the second rotor cores 22 are in one-to-one correspondence.

Each mounting hole is installed with a second permanent magnet 24, and the second permanent magnets 24 fill the corresponding mounting hole, so that the first rotor core 21, the adjacent second rotor core 22 and the adjacent two first permanent magnets 23 can be connected through the second permanent magnets 24 to ensure the structural strength of the rotor 20.

Each first permanent magnet 23 is magnetized in the circumferential direction, and the magnetizing directions of two adjacent first permanent magnets 23 are opposite, so that magnetic lines of force of the magnetic field generated by each first permanent magnet 23 enter the stator 10 through the second rotor iron core 22 on one side, the magnetic lines of force of the magnetic field generated by the first permanent magnets 23 are prevented from directly reaching the adjacent first permanent magnets 23, and the utilization efficiency of the magnetic field is improved.

Each second permanent magnet 24 is magnetized in the radial direction, so that magnetic lines of force of the magnetic field generated by the first permanent magnets 23 on the two sides are reduced, and the magnetic flux leakage is reduced by enabling the magnetic lines of force to pass through the second permanent magnets 24 to the first rotor core 21.

Compared with the prior art, the rotor 20 provided by the embodiment of the application, the rotor 20 of the embodiment of the application is arranged at intervals of the second rotor core 22 and the first rotor core 21 between two adjacent first permanent magnets 23 to form the mounting hole, and the second permanent magnets 24 are filled and mounted in the mounting hole, so that the magnetic leakage of the side surfaces of the second permanent magnets 24 to the first rotor core 21 is blocked through the second permanent magnets 24, and the output magnetic field intensity of the rotor 20 is improved.

Compared with the prior art, the motor 100 provided by the embodiment of the application uses the rotor 20 of the embodiment, can ensure smaller magnetic leakage of the rotor 20, improves the output magnetic field intensity of the rotor 20, further improves the air gap magnetic field amplitude intensity of the motor 100, and improves the output power and efficiency of the motor 100.

In one embodiment, referring to fig. 3, 6 and 9, the magnetizing directions of two adjacent second permanent magnets 24 are opposite. Two adjacent second permanent magnets 24: the magnetizing directions of one second permanent magnet 24 and the two first permanent magnets 23 adjacent to the second permanent magnet 24 face the adjacent second rotor core 22, and the magnetizing directions of the other second permanent magnet 24 and the two first permanent magnets 23 adjacent to the second permanent magnet 24 face away from the adjacent second rotor core 22. That is, when the magnetizing direction of one second permanent magnet 24 is directed toward the adjacent second rotor core 22, the magnetizing directions of two first permanent magnets 23 adjacent to the second rotor core 22 are also directed toward the second rotor core 22; when the magnetizing direction of one second permanent magnet 24 faces away from the adjacent second rotor core 22, the magnetizing directions of two first permanent magnets 23 adjacent to the second rotor core 22 also face away from the second rotor core 22.

Through the above structure, the two adjacent second permanent magnets 24, the first rotor core 21, the stator 10 and the two second rotor cores 22 corresponding to the two second permanent magnets 24 can form a magnetic circuit, so that a magnetic field generated by the second permanent magnets 24 is utilized, the output magnetic field strength of the rotor 20 is increased, and the output torque and the output efficiency of the motor 100 are improved.

In one embodiment, referring to fig. 3 and 6, the first permanent magnet 23 may use a ferrite magnet to reduce the cost. It will be appreciated that magnets of other materials may be used for the first permanent magnet 23.

In one embodiment, referring to fig. 3 and 6, the second permanent magnet 24 may use a ferrite magnet to reduce cost. It will be appreciated that magnets of other materials may be used for the first permanent magnet 23.

In one embodiment, referring to fig. 3 and 6, the cross section of the first permanent magnet 23 is rectangular for design and manufacturing convenience, and for installation and fixation of the first permanent magnet 23. It is understood that the cross section of the first permanent magnet 23 may be configured to have other shapes such as a trapezoid.

In one embodiment, each first rotor core 21 is formed by lamination of punching sheets, so as to reduce the iron loss of the first rotor core 21 and improve the output torque and efficiency. The punching sheet can be made of silicon steel sheets so as to reduce the cost.

In one embodiment, each second rotor core 22 is formed by stacking laminated sheets, so as to reduce the iron loss of second rotor core 22 and improve the output torque and efficiency. The punching sheet can be made of silicon steel sheets so as to reduce the cost.

In one embodiment, the number of the first permanent magnets 23 and the second rotor core 22 is four, so that the rotor 20 forms four magnetic poles. It is understood that the first permanent magnets 23 and the second rotor core 22 may be provided in other numbers to form other numbers of magnetic poles.

In an embodiment, referring to fig. 3, fig. 6 and fig. 8, the two opposite sides of each second permanent magnet 24 are respectively provided with an accommodating slot 241, so that a corner of the inner end of the first permanent magnet 23 is inserted into the accommodating slot 241 of the adjacent second permanent magnet 24, that is, a corner of the first permanent magnet 23 close to one end of the first rotor core 21 is inserted into the accommodating slot 241 of the adjacent second permanent magnet 24, so as to position and support the first permanent magnet 23 through the second permanent magnet 24. It is understood that the second permanent magnet 24 may only contact with the inner end surface of the first permanent magnet 23, and thus, a slot structure is required on the second rotor core 22 to accommodate the corner of the inner end of the first permanent magnet 23. Of course, one corner of the inner end of first permanent magnet 23 is connected to one corner of second permanent magnet 24 adjacent to it and one corner of second rotor core 22 adjacent to it, so that neither second permanent magnet 24 nor second rotor core 22 has a slot structure.

In one embodiment, referring to fig. 6, 7 and 8, the connection surface 212 of the first rotor core 21 and the first permanent magnet 23 is a plane, that is, the region where the first rotor core 21 is connected to the first permanent magnet 23 is a plane structure, so as to facilitate the processing, manufacturing and connection of the first rotor core 21 and the first permanent magnet 23. It is understood that a positioning groove may be provided on the first rotor core 21, and an insertion protrusion may be provided on the first permanent magnet 23, so as to install the first permanent magnet 23 on the first rotor core 21 by inserting the insertion protrusion into the positioning groove, thereby ensuring that the first permanent magnet 23 is firmly connected with the first rotor core 21. Of course, it is also possible to provide the insertion protrusion on the first rotor core 21 and the positioning groove on the first permanent magnet 23, so as to install the first permanent magnet 23 on the first rotor core 21 by inserting the insertion protrusion into the positioning groove, thereby ensuring that the first permanent magnet 23 is firmly connected with the first rotor core 21.

In one embodiment, referring to fig. 6, 7 and 8, the connection surface 213 of the first rotor core 21 and the second permanent magnet 24 is a plane, that is, the region where the first rotor core 21 is connected to the second permanent magnet 24 is a plane structure, so as to facilitate the manufacturing and connection of the first rotor core 21 and the second permanent magnet 24. It is understood that it is also possible to provide slots on the first rotor core 21 and connecting protrusions on the second permanent magnets 24, and to secure the second permanent magnets 24 to the first rotor core 21 by inserting the connecting protrusions into the slots to mount the second permanent magnets 24 on the first rotor core 21. Of course, it is also possible to provide a connecting projection on the first rotor core 21 and a slot on the second permanent magnet 24, and to mount the second permanent magnet 24 on the first rotor core 21 by inserting the connecting projection into the slot, so as to ensure that the second permanent magnet 24 is firmly connected with the first rotor core 21.

In one embodiment, referring to fig. 6, 7 and 8, the connection surface 212 of the first rotor core 21 and the first permanent magnet 23 is a plane, and the connection surface 213 of the first rotor core 21 and the second permanent magnet 24 is a plane, so that the cross section of the first rotor core 21 can be polygonal for convenient processing.

In one embodiment, the cross-section of the first rotor core 21 is a regular polygon to facilitate manufacturing.

In one embodiment, referring to fig. 6 and 8, a connection surface 242 between the second rotor core 22 and the second permanent magnet 24 is a plane, that is, a region where the second rotor core 22 is connected to the second permanent magnet 24 is a plane structure, so as to facilitate the manufacturing and connection of the second rotor core 22 and the second permanent magnet 24. It is to be understood that a connection groove may be provided on second rotor core 22, and a rib may be provided on second permanent magnet 24, and by inserting the rib into the connection groove, second permanent magnet 24 is mounted on second rotor core 22, so that second permanent magnet 24 is securely connected to second rotor core 22. Of course, it is also possible to provide ribs on second rotor core 22 and to provide connecting grooves on second permanent magnet 24, and to mount second permanent magnet 24 on second rotor core 22 by inserting the ribs into the connecting grooves, so as to ensure that second permanent magnet 24 is firmly connected to second rotor core 22.

In one embodiment, referring to fig. 3 and 6, the outer side surface of each second rotor core 22 is arc-shaped to better fit with the stator 10, reduce the distance between the second rotor core 22 and the stator teeth 112, reduce the air gap, improve the magnetic field utilization rate, and further improve the torque and efficiency of the motor 100.

In one embodiment, the two opposite sides of the outer end of each second rotor core 22 are respectively provided with a positioning protrusion 221, and each positioning protrusion 221 is protruded from the second rotor core 22 along the circumferential direction of the rotor 20, that is, each positioning protrusion 221 is protruded from the second rotor core 22 along the circumferential direction of the second rotor core 22, so that the positioning protrusion 221 can abut against and position the first permanent magnet 23, so as to position and fix the first permanent magnet 23.

In one embodiment, referring to fig. 3, 5 and 6, the rotor 20 further includes two cover plates 25 and a plurality of connecting members 26, the first rotor core 21, each second rotor core 22, each first permanent magnet 23 and each second permanent magnet 24 are located between the two cover plates 25, and the cover plate 25 is provided with an opening 251 corresponding to the rotating shaft hole 211 of the first rotor core 21 to expose the rotating shaft hole 211 so that the rotating shaft can pass through. The second rotor core 22 is provided with a through hole 222, the through hole 222 is disposed on the corresponding second rotor core 22 along the axial direction of the rotating shaft hole 211, so that the connecting member 26 can pass through the through hole 222 on the corresponding second rotor core 22 to connect the two cover plates 25, so as to fixedly connect the first rotor core 21, each second rotor core 22, each first permanent magnet 23 and each second permanent magnet 24, thereby improving the structural strength of the rotor 20.

In one embodiment, the connectors 26 are in one-to-one correspondence with the through holes 222, and each connector 26 connects the two cover plates 25 through the corresponding through hole 222 to increase the structural strength of the rotor 20. It is to be understood that through holes 222 may be provided only in a part of the second rotor core 22, and the connecting members 26 may be provided in the corresponding through holes 222 to connect the two cover plates 25. Of course, it is also possible to provide a through hole 222 in each second rotor core 22 and provide a connecting member 26 in a part of the through hole 222 to connect the two cover plates 25.

In one embodiment, the cover plate 25 may use a metal cover to secure the structural strength of the cover plate 25. It will be appreciated that other hard materials may be used for the cover plate 25.

In one embodiment, a plurality of elastic pieces 252 are disposed on at least one cover plate 25, and each elastic piece 252 protrudes from the cover plate 25 toward another cover plate 25, so that when the connecting member 26 connects two cover plates 25, the elastic pieces 252 on the cover plates 25 can abut against the second rotor core 22 or the first permanent magnet 23, so as to increase the structural strength of the connection. In addition, when second rotor core 22 is stacked by using the punching sheets, the stacked structural strength of the punching sheets of second rotor core 22 can be better ensured.

In one embodiment, the cover plate 25 is provided with an opening 253, the opening 253 is located at a position corresponding to the elastic piece 252, one end of the elastic piece 252 is connected to a side wall of the opening 253 so as to support the elastic piece 252, and when the elastic piece 252 is deformed by pressing, the opening 253 can lift a deformation accommodating space of the elastic piece 252 so that the cover plate 25 presses the first permanent magnet 23 and the second rotor core 22 to ensure connection stability.

In one embodiment, the elastic pieces 252 on the cover plate 25 are correspondingly arranged in pairs, each pair of elastic pieces 252 are oppositely arranged and bent in an arc shape, two ends of each pair of elastic pieces 252 are bent towards the radial outer side of the cover plate 25, and the connecting member 26 is located at the inner side of the elastic piece 252 along the radial direction of the cover plate 25, so that the elastic pieces 252 can abut against the second rotor core 22 and the first permanent magnet 23 at the position of the connecting member 26 along the radial outer side of the cover plate 25, the second rotor core 22 and the first permanent magnet 23 can be better stabilized, and the strength of the connecting structure can be improved.

In one embodiment, the elastic pieces 252 are provided in multiple pairs, and the multiple pairs of elastic pieces 252 are annularly arranged on the cover plate 25, so that after assembly, the force applied to the circumferential side of the cover plate 25 is uniform, thereby ensuring the structural stability of the rotor 20.

In one embodiment, the connector 26 may be a rivet. Of course, fasteners such as screws, bolts, etc. may be used for the coupling member 26.

Referring to fig. 3 and 9, in the rotor 20 according to the embodiment of the present application, the second rotor core 22 and the first rotor core 21 are disposed at an interval, the second permanent magnets 24 are filled in the plurality of mounting holes formed by rotating the plurality of second permanent magnets 24, the plurality of second rotor cores 22 and the first rotor core 21, and the second permanent magnets 24 are connected to the adjacent second rotor core 22, the second permanent magnets 24 and the first rotor core 21, so as to ensure the structural strength, and the second permanent magnets 24 block the leakage flux of the first permanent magnets 23, thereby improving the magnetic field utilization rate of the first permanent magnets 23, and the second permanent magnets 24 are disposed, so as to increase the air gap magnetic field and improve the output torque and power of the motor 100. Referring to fig. 1 and fig. 2, compared with the permanent magnet motor 900 in the related art, when the motor 100 in the embodiment of the present application has the same size, that is, the stator has the same size, and the rotor has the same outer dimension and the first permanent magnet has the same size, the amplitude of the no-load air-gap magnetic field fundamental wave of the motor 100 in the embodiment of the present application is increased by about 36.4%, which can effectively reduce the operating current of the motor 100, increase the output power of the motor 100, and increase the power density of the motor 100. In addition, the gap between the stator 10 and the rotor 20 of the motor 100 can be properly enlarged without increasing the residual magnetism of the permanent magnet, thereby improving the reliability of the motor 100.

The embodiment of the application also provides a compressor. Referring to fig. 3, the compressor includes the motor 100 according to the above embodiment. Because of using the motor 100, the compressor of the embodiment has higher efficiency, more energy saving and higher reliability. The compressor of the present embodiment further has the beneficial effects of the motor 100, which are not described herein again.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rotor, characterized by: the permanent magnet synchronous motor comprises a first rotor core, a second rotor core, a plurality of first permanent magnets and a plurality of second permanent magnets, wherein a rotating shaft hole is formed in the first rotor core, the first permanent magnets are annularly arrayed on the peripheral side of the first rotor core, the second rotor core is arranged between every two adjacent first permanent magnets, each second rotor core and the first rotor core are arranged at intervals, each second rotor core, the first rotor core and two first permanent magnets adjacent to the second rotor core jointly enclose a mounting hole, and the second permanent magnets are filled in the mounting holes; each first permanent magnet is magnetized in the circumferential direction, each second permanent magnet is magnetized in the radial direction, and the magnetizing directions of the two adjacent first permanent magnets are opposite.

2. The rotor of claim 1, wherein adjacent two of the second permanent magnets are oppositely magnetized; two adjacent second permanent magnets: the magnetizing directions of the second permanent magnet and the two first permanent magnets adjacent to the second permanent magnet face towards the adjacent second rotor core, and the magnetizing directions of the other second permanent magnet and the two first permanent magnets adjacent to the second permanent magnet face away from the adjacent second rotor core.

3. The rotor of claim 1, wherein: the two opposite sides of each second permanent magnet are respectively provided with an accommodating groove, and the corner of one end of each first permanent magnet close to the first rotor iron core is matched with and extends into the adjacent accommodating groove.

4. A rotor according to any one of claims 1-3, wherein: the connection surface of the first rotor core and the first permanent magnet is a plane, and the connection surface of the first rotor core and the second permanent magnet is a plane.

5. A rotor according to any one of claims 1-3, wherein: and the connection surface of the second permanent magnet and the second rotor core is a plane.

6. A rotor according to any one of claims 1-3, wherein: and the outer side surface of each second rotor iron core is arc-shaped.

7. A rotor according to any one of claims 1-3, wherein: and two opposite sides of the outer side end of each second rotor iron core are respectively provided with a positioning protrusion which abuts against and positions the first permanent magnet along the circumferential direction of the first rotor iron core in a protruding manner.

8. A rotor according to any one of claims 1-3, wherein: the cross section of each first permanent magnet is rectangular.

9. A rotor according to any one of claims 1-3, wherein: the rotor further comprises two cover plates and a plurality of connecting pieces, the two cover plates are arranged at two axial ends of the first rotor core respectively, the connecting pieces are connected with the two cover plates, each second rotor core, each first permanent magnet and each second permanent magnet are located between the two cover plates, through holes for the connecting pieces to penetrate through are formed in the second rotor core along the axial direction of the rotating shaft hole, and open holes are formed in the positions, corresponding to the rotating shaft holes, of the cover plates.

10. The rotor of claim 9, wherein: a plurality of elastic sheets are convexly arranged on at least one cover plate in the direction towards the other cover plate.

11. An electric machine comprising a stator, characterized in that: further comprising a rotor according to any of claims 1-10, said rotor being mounted in said stator.

12. A compressor, characterized by: comprising an electric machine according to claim 11.