CN117856489A - Rotor assembly, motor, electric appliance and vehicle - Google Patents

Abstract

The invention provides a rotor assembly, a motor, an electric appliance and a vehicle. The rotor assembly comprises a supporting piece, a rotor iron core, a magnetic piece and a connecting piece; the rotor core comprises a plurality of first core blocks and second core blocks, wherein the first core blocks are connected with the supporting piece and are arranged along the circumferential direction of the supporting piece; the second iron core blocks are arranged between the adjacent first iron core blocks in the plurality of first iron core blocks, and the first iron core blocks adjacent to the second iron core blocks in the plurality of first iron core blocks and the second iron core blocks are arranged at intervals and form mounting grooves; the plurality of first iron core blocks and/or the plurality of second iron core blocks are provided with connecting grooves; the magnetic piece is embedded in the mounting groove; the connecting piece is embedded in the connecting groove.

Description

Rotor assembly, motor, electric appliance and vehicle

Technical Field

The invention relates to the technical field of motors, in particular to a rotor assembly, a motor, an electric appliance and a vehicle.

Background

Currently, in the related art, a rotor assembly of a motor includes a rotor core and a permanent magnet, a mounting groove is provided on the rotor core, the permanent magnet is provided in the mounting groove, and the rotor core is provided with a magnetic bridge at a side of the permanent magnet away from an axis of the rotor core. However, as the magnetic bridge is arranged on one side of the permanent magnet far away from the axis of the rotor core, the magnetic bridge can increase the magnetic leakage of the permanent magnet and the armature magnetic field, thereby affecting the performance of the motor.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, a first aspect of the invention proposes a rotor assembly.

A second aspect of the invention proposes an electric machine.

A third aspect of the present invention provides an electrical appliance.

A fourth aspect of the invention proposes a vehicle.

In view of this, a first aspect of the present invention provides a rotor assembly comprising a support member, a rotor core, a magnetic member, and a connecting member; the rotor core comprises a plurality of first core blocks and second core blocks, wherein the first core blocks are connected with the supporting piece and are arranged along the circumferential direction of the supporting piece; the second iron core blocks are arranged between the adjacent first iron core blocks in the plurality of first iron core blocks, and the first iron core blocks adjacent to the second iron core blocks in the plurality of first iron core blocks and the second iron core blocks are arranged at intervals and form mounting grooves; the plurality of first iron core blocks and/or the plurality of second iron core blocks are provided with connecting grooves; the magnetic piece is embedded in the mounting groove; the connecting piece is embedded in the connecting groove.

The rotor assembly comprises a rotor core, wherein the rotor core comprises a plurality of first core blocks, the plurality of first core blocks are connected with a supporting piece and are arranged along the circumferential direction of the supporting piece, and the first core blocks are further supported by the supporting piece. The rotor assembly further comprises a second core block, the second core block is arranged between two adjacent first core blocks in the plurality of first core blocks, and a mounting groove is formed between the second core block and the first core blocks. The rotor assembly further comprises a magnetic piece, wherein the magnetic piece is arranged in the mounting groove, and then the magnetic piece is mounted and fixed through the mounting groove. Be provided with the spread groove on a plurality of first iron core pieces and/or the second iron core piece, rotor subassembly still includes the connecting piece, and the connecting piece sets up in the spread groove, and then connects and fixes a plurality of rotor punching that pile up the setting of a plurality of first iron core pieces and/or second iron core pieces through the connecting piece, and then makes a plurality of rotor punching can form a plurality of first iron core pieces and/or second iron core pieces.

Because the first iron core blocks and the second iron core blocks adjacent to the second iron core blocks in the first iron core blocks are arranged at intervals, the first iron core blocks and the second iron core blocks are not connected, and after the magnetic piece is installed in the installation groove, magnetic bridges are not arranged on two radial sides of the magnetic piece, so that magnetic leakage of a permanent magnet and an armature magnetic field caused by the magnetic bridges is reduced, and the performance of the motor is improved.

The plurality of first iron core blocks are supported and fixed by the support piece, so that the plurality of first iron core blocks become a whole, the integral strength of the rotor iron core is improved, the first iron core blocks are matched with the second iron core blocks, the integrity of the rotor iron core can be ensured, the magnetic pieces can be prevented from being provided with magnetic bridges along the radial two sides, and the magnetic leakage of permanent magnets and armature magnetic fields caused by the magnetic bridges is reduced when the strength of the rotor iron core is improved, and the performance of the motor is integrally improved.

Specifically, among the plurality of first core blocks, a connection slot may be provided on each of the first core blocks.

Among the plurality of first core blocks, a connecting groove may be provided on the first core blocks spaced apart by a certain number, for example, one connecting groove may be provided on each first core block or on each two first core blocks spaced apart.

The number of the second iron core blocks is a plurality of, and the second iron core blocks are the same as the second iron core blocks in number, and connecting grooves can be formed in each second iron core block.

Among the plurality of second core blocks, a connecting groove may be provided on the second core blocks spaced apart by a certain number, for example, one connecting groove may be provided every second core block or two second core blocks spaced apart.

Specifically, the first core block and the second core block are arranged at intervals, and the first core block and the second core block are not connected at one side of the permanent magnet, which is far away from the axis of the rotor core.

Specifically, the core block has a magnetizing orientation and the connector has no magnetizing orientation.

In addition, the rotor assembly in the technical scheme provided by the invention can also have the following additional technical characteristics:

in one technical scheme of the invention, the magnetic part is an injection-molded magnetic part; and/or the connecting piece is an injection molding piece or an injection molding magnetic piece.

In the technical scheme, the magnetic part is an injection molding magnetic part, so that the manufacturing process of the rotor assembly is simpler and more convenient, the manufacturing difficulty of the rotor assembly is further reduced, and the manufacturing efficiency of the rotor assembly is improved. And the injection molding magnetic part has higher consistency after finishing processing, so that the performance of the rotor assembly is more stable, and the quality of the motor is further improved. The connecting piece is an injection molding piece and/or an injection molding magnetic piece, so that the manufacturing process of the rotor assembly can be simplified, the manufacturing difficulty of the rotor assembly is further reduced, and especially in the case that the connecting piece is an injection molding magnetic piece, the connecting piece and the magnetic piece can be subjected to co-injection molding, the manufacturing process steps of the rotor assembly are further reduced, the manufacturing process of the rotor assembly is simplified, the manufacturing difficulty of the rotor assembly is reduced, and the manufacturing efficiency of the rotor assembly is improved.

And through setting up the magnetic part into the magnetic part of moulding plastics, the magnetic part can be with the first iron core piece that is located the magnetic part in circumference both sides and second iron core piece connect into a whole, and then realize being fixed in on the first iron core piece with the second iron core piece, promote rotor assembly's stability in the rotation in-process.

Meanwhile, the magnetic part is an injection molding magnetic part, and the connecting part is an injection molding part or an injection molding magnetic part, so that the material cost of the magnetic part material used by the rotor assembly can be effectively reduced, and the cost of the rotor assembly is further reduced.

Further, the magnetic piece and the connecting piece are of an integrated structure and are injection-molded magnetic pieces.

The injection molding magnetic part is made of injection molding magnetic material obtained by mixing magnetic conductive material with plastic and injection molding.

In one technical scheme of the invention, the remanence of the magnetic part is a first remanence, the remanence of the connecting part is a second remanence, and the first remanence is more than or equal to 10 times of the second remanence.

In the technical scheme, the remanence of the connecting piece is greater than or equal to 10 times of the remanence of the magnetic piece, so that the interference of the magnetic field generated by the connecting piece on the magnetic field generated by the magnetic piece is reduced, the stator can drive the rotor assembly more stably, and the stability of the motor in the running process is further improved.

Specifically, the remanence of the magnetic member is much larger than the remanence of the connecting member.

In one technical scheme of the invention, the rotor assembly further comprises a first positioning part, the first positioning part is positioned on the periphery of the magnetic piece, the first end is connected with one of the first iron core blocks or the second iron core block, and the second end extends into the circumferential mounting groove.

In this technical scheme, the rotor core includes a plurality of core blocks, and a plurality of core blocks are first core block and second core block respectively.

The first end of first location portion is connected with one iron core piece in a plurality of iron core pieces, and the first end of first location portion can be connected with first iron core piece promptly, also can be connected with the second iron core piece, and first iron core piece or second iron core piece support first location portion, and the second end of first location portion extends in the circumference mounting groove, and first location portion sets up in the periphery of magnetic part for first location portion can block the magnetic part and break away from the mounting groove along the radial direction. In the rotating process of the rotor assembly, the magnetic piece can be subjected to radial outward centrifugal force, namely, the direction of the centrifugal force received by the magnetic piece is radial along the rotor core, the axis of the rotor core points to the periphery of the rotor core, the blocking of the first positioning part on the magnetic piece can offset the centrifugal force received by the magnetic piece, and then the magnetic piece is fixed in the mounting groove between the adjacent core blocks, so that the stability of the magnetic piece in the rotating process of the rotor assembly is improved.

Specifically, the rotor assembly is an inner rotor assembly, and the first positioning part is located on the periphery of the magnetic piece. The rotor assembly is an outer rotor assembly, and the first positioning part is also positioned on the periphery of the magnetic piece.

Further, the first positioning portion and the first core block are of an integral structure.

The first positioning part and the second iron core block are of an integrated structure.

The first iron core block and the second iron core block which are arranged on two sides of the same mounting groove in the circumferential direction of the rotor iron core can be provided with a first positioning part on one of the first iron core block and the second iron core block, the first positioning part extends into the mounting groove, and the first iron core block and the second iron core block can be respectively provided with a first positioning part, and the two first positioning parts extend into the mounting groove.

Under the condition that one first positioning part is arranged on each of the first iron core block and the second iron core block, the two first positioning parts positioned in the same mounting groove are not connected.

Further, the mounting groove also can be set to trapezoidal, and the mounting groove is kept away from axis one side and is less than the width of magnetic part in being close to axis one side in circumference direction at circumference width, and then realizes fixing to magnetic part, and first iron core piece and second iron core piece can offset the centrifugal force that magnetic part received, and then in fixing the magnetic part in the mounting groove between the adjacent iron core piece, promote the stability of magnetic part at rotor subassembly rotation in-process.

In one embodiment of the present invention, the number of the magnetic members is plural, and magnetizing directions of adjacent magnetic members in the plural magnetic members are opposite or opposite in the circumferential direction.

In the technical scheme, the magnetizing directions of the adjacent magnetic pieces in the plurality of magnetic pieces are opposite or opposite along the circumferential direction, so that the magnetizing directions of the plurality of magnetic pieces are alternately arranged along the circumferential direction of the rotor core, and further the two magnetic pieces with opposite magnetizing directions in the plurality of magnetic pieces form magnetic poles, and the rotor assembly is ensured to rotate under the drive of the stator winding.

Specifically, the magnetizing direction of the magnetic piece is the magnetic induction line direction of the magnetic piece, and the N pole of the magnetic piece points to the S pole of the magnetic piece.

Specifically, two adjacent magnetic pieces in the plurality of magnetic pieces are a first magnetic piece and a second magnetic piece respectively, and the first magnetic piece is positioned on a first side of the second magnetic piece in the circumferential direction of the rotor core. The magnetizing direction of the first magnetic piece points to the second magnetic piece from the first magnetic piece, and the magnetizing direction of the second magnetic piece points to the first magnetic piece from the second magnetic piece.

In one technical scheme of the invention, the connecting groove is a through hole which penetrates through the plurality of first iron core blocks or the plurality of second iron core blocks along the axial direction of the plurality of first iron core blocks or the plurality of second iron core blocks; or the connecting groove is a groove recessed from the side walls of the first iron core blocks or the second iron core blocks to the axis.

In this technical scheme, the spread groove is the through-hole that link up first iron core piece or second iron core piece along the axial of first iron core piece or second iron core piece, or the spread groove is the recess that is sunken to the axis by the lateral wall of first iron core piece or second iron core piece, and the connecting piece inlays in the spread groove, and then realizes the fixed to the rotor punching that stacks the setting along the axial of rotor core for a plurality of rotor punching form the iron core piece.

And set up the spread groove into the through-hole that link up first iron core piece or second iron core piece along the axial of first iron core piece or second iron core piece, or set up the spread groove into by the lateral wall of first iron core piece or second iron core piece to the sunken recess of axis, reduce the spread groove and cause the influence to the structure of first iron core piece and second iron core piece, and then make the iron core loss of motor can not increase, avoid because of seting up the spread groove and cause the influence to the efficiency of motor, also can not reduce the output torque of motor by a wide margin, further ensure the basic performance of motor.

The connecting groove is a through hole which penetrates through the first iron core block or the second iron core block along the axial direction of the first iron core block or the second iron core block, and when the connecting piece is injection molded, injection molding materials for the injection molding connecting piece enter the through hole, so that a columnar connecting piece extending along the axial direction is formed in the through hole.

The spread groove is the recess that is sunken to the axis by the lateral wall of first iron core piece or second iron core piece, and the notch has been seted up to the recess on the lateral wall of iron core piece, and then when the connecting piece of moulding plastics, the material of moulding plastics can more smooth and easy flow in the spread groove, avoids the connecting piece to break off in the spread groove for the connecting piece can fix rotor core more stably, further promotes rotor assembly's stability at the rotation in-process.

Specifically, the connecting groove is a through hole penetrating through the first core block along the first core block.

The connecting groove is a through hole penetrating through the second iron core block along the second iron core block.

The connecting groove is a groove recessed from the side wall of the first iron core block to the axis.

The connecting groove is a groove recessed from the side wall of the second iron core block to the axis.

The specific structures of the four connecting grooves can be combined according to the needs.

In one embodiment of the invention, the radial cross section of the connecting groove has a circular, oval, triangular, rectangular, pentagonal or hexagonal shape.

In this technical scheme, the radial cross-section of spread groove is circular, oval, triangle-shaped, rectangle, pentagon or hexagon for the shape of spread groove is more various, promotes the variety of spread groove form.

Further, the radial section of the connecting groove can be an irregular pattern, but the regular pattern is more beneficial to cutting of the rotor punching sheet, so that the rotor punching sheet is easier to mold at one time, the convenience of the rotor punching sheet is further improved, the manufacturing process of the rotor assembly is further simplified, and the manufacturing difficulty of the rotor assembly is reduced.

Specifically, the number of the connecting slots on the second core block is one or more, and when the number of the connecting slots is a plurality of the connecting slots, the connecting slots can be distributed along the radial direction. The radial cross-sections of the plurality of connecting grooves may be identical or different in shape.

The number of the connecting grooves on the second iron core block is one or more, and when the number of the connecting grooves is a plurality of the connecting grooves, the connecting grooves can be distributed along the radial direction. The radial cross-sections of the plurality of connecting grooves may be identical or different in shape.

In one aspect of the present invention, the rotor assembly further includes a support frame disposed at an end of the rotor core in an axial direction, and disposed along a circumferential direction of the rotor core, and connected to the connection member.

In this technical scheme, rotor subassembly still includes the support frame, and the support frame is located rotor core's tip, and is connected with the connecting piece, and then is fixed a plurality of iron core piece connecting pieces through the support frame, further promotes rotor subassembly at the stability of rotation in-process.

Specifically, each of the first core blocks and the second core blocks is provided with a connecting slot, and the number of the connecting slots can be one or a plurality of. Connecting pieces are formed in the connecting grooves in an injection molding mode, the connecting pieces are connected with the supporting frame, and then the plurality of first iron core blocks and the plurality of second iron core blocks are fixed through the supporting frame, so that rotor iron cores distributed along the circumferential direction are formed.

The support frame may be annular.

Among the plurality of first iron core blocks and the plurality of second iron core blocks, only part of the iron core blocks can be provided with connecting grooves, and the iron core blocks without the connecting grooves are fixedly connected through magnetic pieces.

The support frame can be one, sets up in the one end of rotor core. The number of the supporting frames can be two, and two supporting frames are respectively arranged at two ends of the rotor core in the axial direction.

In one aspect of the invention, the support frame is an injection molded part or an injection molded magnetic part.

In the technical scheme, the support frame is an injection molding piece or an injection molding magnetic piece, so that the manufacturing difficulty of the rotor assembly is further reduced, and the manufacturing efficiency of the rotor assembly is improved. And the support frame has higher uniformity after the processing is accomplished in the injection molding for rotor subassembly's performance is more stable, and then promotes the quality of motor.

Specifically, the support frame is the magnetic part of moulding plastics, and support frame, connecting piece and magnetic part can be integrated into one piece structure, and then once injection moulding further simplifies rotor assembly's assembly process, reduces rotor assembly's manufacturing degree of difficulty, promotes rotor assembly's manufacturing rate.

The support frame is the injection molding, for the magnetic part of support frame injection molding for the cost of support frame is lower, and then reduces the material cost of motor.

Further, the support frame is composed of injection molding magnets, the injection molding magnets are not oriented, and the motor is nonmagnetic after magnetizing.

In one aspect of the present invention, the support includes a body and a plurality of connection portions; the body is annular; each of the plurality of connecting portions extends in the radial direction of the rotor core, a first end of the plurality of connecting portions is connected with the body, and a second end of the plurality of connecting portions is connected with the plurality of first core blocks respectively.

In this technical scheme, support piece includes body and a plurality of connecting portion, and a plurality of connecting portions are arranged along being the periphery of annular body to the first end and the body coupling of connecting portion, the second end and the first iron core piece of connecting portion are connected, make the body support first iron core piece through connecting portion, make a plurality of first iron core pieces can form a whole, and then reduce rotor assembly's assembly step, reduce rotor assembly's assembly degree of difficulty, promote rotor assembly's assembly efficiency.

In one technical scheme of the invention, the supporting piece further comprises a supporting part, the supporting part is arranged between two adjacent connecting parts in the plurality of connecting parts, the first end is connected with the body, and the second end is abutted against the magnetic piece.

In this technical scheme, support piece still includes supporting part, and supporting part sets up between two adjacent connecting portions, and the position of supporting part is relative with the mounting groove promptly. After the magnetic piece is installed in the installation groove, the supporting part can support the magnetic piece, so that the accuracy of the position of the magnetic piece in the installation groove is improved, and the overall performance of the motor is further improved.

In one technical scheme of the invention, the plurality of connecting parts are injection molding parts or injection molding magnetic parts; or a plurality of connecting parts, the body and the first iron core block are of an integrated structure.

In this technical scheme, a plurality of connecting portions are injection molding or injection molding magnetic part, need not to set up connecting portion on the rotor core promptly, but through when injection molding magnetic part and connecting piece, together mould plastics out connecting portion, and then realize the connection of first iron core piece and connecting portion.

Connecting portion, body and first iron core piece are integrated into one piece structure for rotor core's punching can once only be formed out connecting portion, body and first iron core piece, then overlap rotor core's punching along the axial and establish, and then form rotor core.

In one technical scheme of the invention, the rotor assembly further comprises a second positioning part, wherein the second positioning part is arranged on the first iron core block and/or the second iron core block, and the second positioning part is a through hole penetrating through the first iron core block and/or the second iron core block along the axial direction.

In this technical scheme, when carrying out the injection molding to the rotor subassembly, set up the locating pin cooperation in can cooperating with injection mold on a plurality of first iron core blocks and second iron core blocks, and then realize the location between first iron core block and second iron core block and the injection mold, promote the accuracy in first iron core block and second iron core block position, and then promote the injection molding accuracy of magnetic part.

The first iron core block and the second iron core block can be provided with the second positioning part, the second positioning part is not required, and under the condition that the second positioning part is not provided, the first positioning part is matched with the positioning component in the die, so that the positioning between the first iron core block and the second iron core block and the die is realized.

A second aspect of the present invention provides an electrical machine comprising a rotor assembly as claimed in any one of the preceding claims, whereby the electrical machine has all the advantages of a rotor assembly as claimed in any one of the preceding claims.

In one aspect of the present invention, the motor further includes a stator assembly, and the rotor assembly is embedded inside the stator assembly. The stator assembly includes a stator core and a coil. The stator core comprises a plurality of stator teeth, the plurality of stator teeth are arranged along the circumferential direction, and stator grooves are formed between adjacent stator teeth in the plurality of stator teeth; the coil is wound on the stator teeth and embedded in the stator slots.

In this technical scheme, rotor subassembly inlays in stator module's inboard, and rotor subassembly is as the inner rotor, can rotate under stator module's drive.

The stator assembly comprises a stator core and a coil, wherein the stator core comprises a plurality of stator teeth, stator grooves are formed between adjacent stator teeth in the plurality of stator teeth, the coil is wound on the stator teeth and embedded in the stator grooves, and the rotor assembly can be driven to rotate after the coil is electrified.

In one aspect of the present invention, the number of poles of the rotor assembly is equal to or greater than the number of stator slots.

In the technical scheme, the number of poles of the rotor assembly is greater than or equal to the number of stator slots, so that the pole arcs of the rotor assembly are larger, and the efficiency of the motor is improved.

The third aspect of the present invention provides an electrical appliance comprising a motor according to any of the above-mentioned aspects, whereby the electrical appliance has all the advantages of the motor according to any of the above-mentioned aspects.

The electric appliance includes an air conditioner, a refrigerator, a washing machine, or a dishwasher.

In particular, the motor can be applied to the occasions of household appliances such as fans, air-conditioning compressors, refrigerator compressors, drum washing machines and the like.

A fourth aspect of the invention provides a vehicle comprising an electric machine as claimed in any one of the preceding claims, whereby the vehicle has all the advantages of an electric machine as claimed in any one of the preceding claims.

Vehicles include electric motor vehicles, hybrid motor vehicles or electric bicycles.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is one of the structural schematic diagrams of a rotor assembly according to one embodiment of the invention;

fig. 2 is one of schematic structural views of a rotor core according to an embodiment of the present invention;

FIG. 3 is a second schematic structural view of a rotor assembly according to one embodiment of the present disclosure;

fig. 4 is a second schematic structural view of a rotor core according to an embodiment of the present invention;

FIG. 5 is a schematic view of a support frame according to an embodiment of the present invention;

FIG. 6 is a third schematic structural view of a rotor assembly according to one embodiment of the present disclosure;

fig. 7 is a schematic structural view of a motor according to an embodiment of the present invention.

Wherein, the correspondence between the reference numerals and the component names in fig. 1 to 7 is:

100 rotor cores, 110 first core blocks, 120 connecting slots, 130 mounting slots, 140 first positioning portions, 150 second core blocks, 160 supporting pieces, 162 bodies, 164 connecting portions, 166 supporting portions, 170 second positioning portions, 200 magnetic pieces, 300 connecting pieces, 400 supporting frames, 500 stator assemblies, 510 stator cores, 512 stator teeth, 514 stator slots, 520 coils.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

A rotor assembly, a motor, an electric appliance, and a vehicle according to some embodiments of the present invention are described below with reference to fig. 1 to 7.

In one embodiment of the present invention, as shown in fig. 1 and 2, there is provided a rotor assembly including a support 160, a rotor core 100, a magnetic member 200, and a connection member 300; the rotor core 100 includes a second core block 150 and a plurality of first core blocks 110, the plurality of first core blocks 110 being connected to the support 160, arranged along a circumferential direction of the support 160; the second core blocks 150 are disposed between adjacent ones of the first core blocks 110, and the first core blocks and the second core blocks 150 adjacent to the second core blocks 150 among the first core blocks 110 are disposed at intervals and form mounting slots 130; the plurality of first core blocks 110 and/or the second core blocks 150 are provided with connection slots 120; the magnetic member 200 is embedded in the installation groove 130; the connector 300 is embedded in the connection groove 120.

In this embodiment, the rotor assembly includes the rotor core 100, the rotor core 100 includes a plurality of first core blocks 110, and the plurality of first core blocks 110 are connected to the support 160, are arranged along the circumferential direction of the support 160, and thus support the first core blocks 110 through the support 160. The rotor assembly further includes a second core block 150, the second core block 150 being disposed between two adjacent first core blocks 110 of the plurality of first core blocks 110, and a mounting groove 130 being formed between the second core block 150 and the first core blocks 110. The rotor assembly further includes a magnetic member 200, and the magnetic member 200 is disposed in the mounting groove 130, so that the magnetic member 200 is mounted and fixed through the mounting groove 130. The plurality of first core blocks 110 and/or second core blocks 150 are provided with connecting slots 120, the rotor assembly further comprises connecting pieces 300, the connecting pieces 300 are arranged in the connecting slots 120, and then the plurality of stacked rotor punching sheets of the plurality of first core blocks 110 and/or second core blocks 150 are connected and fixed through the connecting pieces 300, so that the plurality of rotor punching sheets can form the plurality of first core blocks 110 and/or second core blocks 150.

Because the first core blocks and the second core blocks 150 adjacent to the second core blocks 150 in the plurality of first core blocks 110 are arranged at intervals, the first core blocks and the second core blocks 150 are not connected, and after the magnetic piece 200 is mounted in the mounting groove 130, magnetic bridges are not arranged on two sides of the magnetic piece 200 along the radial direction, so that magnetic leakage of permanent magnets and armature magnetic fields caused by the magnetic bridges is reduced, and the performance of the motor is improved.

The plurality of first iron core blocks 110 are supported and fixed by the supporting piece 160, so that the plurality of first iron core blocks 110 become a whole, the integral strength of the rotor iron core 100 is improved, the first iron core blocks 110 are matched with the second iron core blocks 150, the integrity of the rotor iron core 100 can be ensured, the magnetic pieces 200 can be prevented from being provided with magnetic bridges on two sides in the radial direction, the strength of the rotor iron core 100 is improved, meanwhile, the magnetic leakage of permanent magnets and armature magnetic fields caused by the magnetic bridges is reduced, and the performance of the motor is integrally improved.

Specifically, among the plurality of first core blocks 110, a connection slot 120 may be provided on each first core block 110.

Among the plurality of first core blocks 110, the connection slots 120 may be provided at intervals of a certain number of first core blocks 110, for example, one connection slot 120 is provided every interval of one first core block 110 or two first core blocks 110.

The number of the second core blocks 150 is plural, and the same as the number of the plurality of second core blocks 150, in the plurality of second core blocks 150, the connection groove 120 may be provided on each of the second core blocks 150.

Among the plurality of second core blocks 150, the connection slots 120 may be provided at intervals of a certain number of second core blocks 150, for example, one connection slot 120 is provided every interval of one second core block 150 or two second core blocks 150.

Specifically, the first core block 110 and the second core block 150 are disposed at a spacing, and the first core block 110 and the second core block 150 are not connected at a side of the permanent magnet away from the axis of the rotor core 100.

Specifically, the core block has a magnetizing orientation and the connector 300 has no magnetizing orientation.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

The magnetic member 200 is an injection molded magnetic member.

The connector 300 is an injection molded piece or an injection molded magnetic piece.

In this embodiment, the magnetic member 200 is an injection-molded magnetic member, and the injection-molded magnetic member makes the manufacturing process of the rotor assembly simpler, thereby reducing the manufacturing difficulty of the rotor assembly and improving the manufacturing efficiency of the rotor assembly. And the injection molding magnetic part has higher consistency after finishing processing, so that the performance of the rotor assembly is more stable, and the quality of the motor is further improved. The connecting piece 300 is an injection molding piece and/or an injection molding magnetic piece, so that the manufacturing process of the rotor assembly can be simplified, the manufacturing difficulty of the rotor assembly can be further reduced, and especially for the case that the connecting piece 300 is an injection molding magnetic piece, the connecting piece 300 and the magnetic piece 200 can be jointly injection molded, the manufacturing process steps of the rotor assembly can be further reduced, the manufacturing process of the rotor assembly can be simplified, the manufacturing difficulty of the rotor assembly can be reduced, and the manufacturing efficiency of the rotor assembly can be improved.

And through setting up magnetic part 200 as the magnetic part of moulding plastics, magnetic part 200 can be with being located the first iron core piece 110 and the second iron core piece 150 of magnetic part 200 in the both sides of circumference and connect into a whole, and then realizes fixing second iron core piece 150 on first iron core piece 110, promotes the stability of rotor subassembly in the rotation in-process.

Meanwhile, the magnetic piece 200 is an injection-molded magnetic piece, and the connecting piece 300 is an injection-molded piece or an injection-molded magnetic piece, so that the material cost of the magnetic piece 200 used by the rotor assembly can be effectively reduced, and the cost of the rotor assembly is further reduced.

Further, the magnetic member 200 and the connecting member 300 are integrally formed, and are injection-molded magnetic members.

The injection molding magnetic part is made of injection molding magnetic material obtained by mixing magnetic conductive material with plastic and injection molding.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

The remanence of the magnetic member 200 is a first remanence, and the remanence of the connecting member 300 is a second remanence, the first remanence being 10 times or more the second remanence.

In this embodiment, the remanence of the magnetic member 200 is greater than or equal to 10 times that of the connecting member 300, so that the interference of the magnetic field generated by the connecting member 300 on the magnetic member 200 is reduced, the stator can drive the rotor assembly more stably, and the stability of the motor in the running process is further improved.

Specifically, the remanence of the magnetic member 200 is much larger than that of the connection member 300.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 3, the rotor assembly further includes a first positioning portion 140, the first positioning portion 140 is located at the outer circumference of the magnetic member 200, a first end is connected to one of the first core blocks 110 or the second core block 150 of the plurality of first core blocks 110, and a second end extends along the circumferential direction within the mounting groove 130.

In this embodiment, the rotor core 100 includes a plurality of core blocks, which are a first core block 110 and a second core block 150, respectively.

The first end of the first positioning portion 140 is connected with one of the plurality of core blocks, that is, the first end of the first positioning portion 140 may be connected with the first core block 110 or may be connected with the second core block 150, the first core block 110 or the second core block 150 supports the first positioning portion 140, the second end of the first positioning portion 140 extends into the circumferential mounting groove 130, and the first positioning portion 140 is disposed on the outer circumference of the magnetic member 200, so that the first positioning portion 140 may block the magnetic member 200 from being separated from the mounting groove 130 in the radial direction. In the process of rotor assembly rotation, the magnetic element 200 can receive centrifugal force outwards along radial direction, namely the direction of centrifugal force received by the magnetic element 200 is along the radial direction of the rotor core 100, and the axial line of the rotor core 100 points to the periphery of the rotor core 100, the blocking of the first positioning part 140 to the magnetic element 200 can offset the centrifugal force received by the magnetic element 200, and then the magnetic element 200 is fixed in the mounting groove 130 between adjacent core blocks, so that the stability of the magnetic element 200 in the rotor assembly rotation process is improved.

Specifically, the rotor assembly is an inner rotor assembly, and the first positioning portion 140 is located at the outer periphery of the magnetic member 200. The rotor assembly is an outer rotor assembly, and the first positioning portion 140 is also located on the outer periphery of the magnetic member 200.

Further, the first positioning portion 140 and the first core block 110 are of an integral structure.

The first positioning portion 140 and the second core block 150 are of an integral structure.

The first core block 110 and the second core block 150 of the same mounting groove 130 on both sides in the circumferential direction of the rotor core 100 may be provided with a first positioning portion 140 on one of the first core block 110 and the second core block 150, and the first positioning portion 140 extends into the mounting groove 130, or may be provided with one first positioning portion 140 on each of the first core block 110 and the second core block 150, and both the first positioning portions 140 extend into the mounting groove 130.

In the case where one first positioning portion 140 is provided on each of the first core block 110 and the second core block 150, the two first positioning portions 140 located in the same mounting groove 130 are not connected.

Further, the mounting groove 130 may be configured as a trapezoid, where the circumferential width of the mounting groove 130 away from the axis is smaller than the circumferential width of the magnetic element 200 near the axis, so as to fix the magnetic element 200, and the first core block 110 and the second core block 150 can counteract the centrifugal force suffered by the magnetic element 200, so that the magnetic element 200 is fixed in the mounting groove 130 between the adjacent core blocks, and stability of the magnetic element 200 in the rotation process of the rotor assembly is improved.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 3, the direction indicated by the arrow in fig. 1 and 3 is the magnetizing direction of the magnetic member 200. The number of the magnetic pieces 200 is plural, and magnetizing directions of adjacent magnetic pieces 200 in the plural magnetic pieces 200 are opposite or opposite in the circumferential direction.

In this embodiment, the magnetizing directions of the adjacent magnetic pieces 200 in the plurality of magnetic pieces 200 are opposite or opposite in the circumferential direction, so that the magnetizing directions of the plurality of magnetic pieces 200 are alternately arranged in the circumferential direction of the rotor core 100, and thus two magnetic pieces 200 opposite in magnetizing direction in the plurality of magnetic pieces 200 form magnetic poles, ensuring that the rotor assembly can rotate under the drive of the stator winding.

Specifically, the magnetizing direction of the magnetic element 200 is the direction of the magnetic induction line of the magnetic element 200, and the N pole of the magnetic element 200 points to the S pole of the magnetic element 200.

Specifically, two adjacent magnetic pieces 200 among the plurality of magnetic pieces 200 are a first magnetic piece and a second magnetic piece, respectively, the first magnetic piece being located at a first side of the second magnetic piece in the circumferential direction of the rotor core 100. The magnetizing direction of the first magnetic piece points to the second magnetic piece from the first magnetic piece, and the magnetizing direction of the second magnetic piece points to the first magnetic piece from the second magnetic piece.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 2, the connection slot 120 may be a through hole penetrating the plurality of first core blocks 110 or second core blocks 150 in the axial direction of the plurality of first core blocks 110 or second core blocks 150.

As shown in fig. 3 and 4, the connection slot 120 may be a groove recessed from the sidewalls of the plurality of first core blocks 110 or the second core blocks 150 toward the axis.

In this embodiment, the connecting slot 120 is a through hole penetrating through the first core block 110 or the second core block 150 along the axial direction of the first core block 110 or the second core block 150, or the connecting slot 120 is a groove recessed from the sidewall of the first core block 110 or the second core block 150 toward the axial direction, and the connecting piece 300 is embedded in the connecting slot 120, so as to fix rotor punching sheets stacked along the axial direction of the rotor core 100, so that a plurality of rotor punching sheets form the core block.

And the connecting groove 120 is arranged to be a through hole penetrating through the first iron core block 110 or the second iron core block 150 along the axial direction of the first iron core block 110 or the second iron core block 150, or the connecting groove 120 is arranged to be a groove recessed from the side wall of the first iron core block 110 or the second iron core block 150 to the axial direction, so that the influence of the connecting groove 120 on the structures of the first iron core block 110 and the second iron core block 150 is reduced, the iron core loss of the motor is not increased, the influence on the efficiency of the motor due to the arrangement of the connecting groove 120 is avoided, the output torque of the motor is not greatly reduced, and the basic performance of the motor is further ensured.

The connecting groove 120 is a through hole penetrating through the first core block 110 or the second core block 150 along the axial direction of the first core block 110 or the second core block 150, and when the connecting piece 300 is injection molded, injection molding material for injection molding the connecting piece 300 enters the through hole, and then a columnar connecting piece 300 extending along the axial direction is formed in the through hole.

The connecting groove 120 is a groove recessed from the side wall of the first iron core block 110 or the second iron core block 150 to the axis, and the groove is provided with a notch on the side wall of the iron core block, so that when the connecting piece 300 is injection molded, injection molding materials can flow smoothly in the connecting groove 120, the connecting piece 300 is prevented from being disconnected in the connecting groove 120, the connecting piece 300 can be used for fixing the rotor iron core 100 more stably, and the stability of the rotor assembly in the rotating process is further improved.

Specifically, the connection slot 120 is a through hole penetrating the first core block 110 along the first core block 110.

The connection groove 120 is a through hole penetrating the second core block 150 along the second core block 150.

The connection groove 120 is a groove recessed from the sidewall of the first core block 110 toward the axis.

The connection groove 120 is a groove recessed from the sidewall of the second core block 150 toward the axis.

The specific structures of the above four kinds of connection grooves 120 may be combined as needed.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 2, the radial cross-section of the connection groove 120 has a circular, oval, triangular, rectangular, pentagonal, or hexagonal shape.

In this embodiment, the radial cross section of the connection groove 120 is circular, oval, triangular, rectangular, pentagonal or hexagonal, so that the shape of the connection groove 120 is more varied, and the variety of the forms of the connection groove 120 is improved.

Further, the radial section of the connecting slot 120 may be an irregular pattern, but the regular pattern is more beneficial to cutting the rotor punching sheet, so that the rotor punching sheet is easier to be formed at one time, thereby improving the convenience of the rotor punching sheet, further simplifying the manufacturing process of the rotor assembly, and reducing the manufacturing difficulty of the rotor assembly.

Specifically, when the number of the connection slots 120 on the second core block 150 is one or more and the number of the connection slots 120 is a plurality, the connection slots may be arranged in the radial direction. The radial cross-sectional shapes of the plurality of connection grooves 120 may be the same or different.

The number of the connection slots 120 on the second core block 150 is one or more, and when the number of the connection slots 120 is a plurality, they may be arranged in the radial direction. The radial cross-sectional shapes of the plurality of connection grooves 120 may be the same or different.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 5, the rotor assembly further includes a support frame 400, and the support frame 400 is disposed at an end of the rotor core 100 in the axial direction, and is disposed along the circumferential direction of the rotor core 100 to be connected with the connection member 300.

In this embodiment, the rotor assembly further includes a support 400, where the support 400 is located at an end of the rotor core 100 and is connected to the connecting piece 300, so that the plurality of core block connecting pieces 300 are fixed by the support 400, and stability of the rotor assembly in the rotation process is further improved.

Specifically, each of the plurality of first core blocks 110 and the plurality of second core blocks 150 is provided with a connection slot 120, and the number of connection slots 120 may be one or more. The connecting piece 300 is formed in the connecting groove 120 by injection molding, and the connecting piece 300 is connected with the supporting frame 400, so that the plurality of first iron core blocks 110 and the plurality of second iron core blocks 150 are fixed through the supporting frame 400, and the rotor iron cores 100 distributed along the circumferential direction are formed.

The support 400 may have a ring shape.

Of the plurality of first core blocks 110 and the plurality of second core blocks 150, only a part of the core blocks may be provided with the connecting grooves 120, and the core blocks not provided with the connecting grooves 120 may be fixedly connected by the magnetic members 200.

The support 400 may be one and provided at one end of the rotor core 100. The number of the supporting frames 400 may be two, and one supporting frame 400 may be provided at each axial end of the rotor core 100.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

The support 400 is an injection molded piece or an injection molded magnetic piece.

In this embodiment, the support frame 400 is an injection molding piece or an injection molding magnetic piece, so as to further reduce the manufacturing difficulty of the rotor assembly and improve the manufacturing efficiency of the rotor assembly. And the support frame 400 has higher uniformity after the injection molding is finished, so that the performance of the rotor assembly is more stable, and the quality of the motor is further improved.

Specifically, the support 400 is an injection-molded magnetic part, and the support 400, the connecting piece 300 and the magnetic part 200 can be in an integrated structure, so that one-time injection molding is performed, the assembly process of the rotor assembly is further simplified, the manufacturing difficulty of the rotor assembly is reduced, and the manufacturing speed of the rotor assembly is improved.

The support 400 is an injection molding piece, and the magnetic piece is injection molded relative to the support 400, so that the cost of the support 400 is lower, and the material cost of the motor is further reduced.

Further, the support 400 is composed of injection magnets, the injection magnets are not oriented, and the motor is non-magnetic after magnetizing.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 2 and 4, the support 160 includes a body 162 and a plurality of connection portions 164; the body 162 is annular; each of the plurality of connection portions 164 extends in the radial direction of the rotor core 100, and the plurality of connection portions 164 have a first end connected to the body 162 and a second end connected to the plurality of first core blocks 110, respectively.

In this embodiment, the supporting member 160 includes a body 162 and a plurality of connecting portions 164, the plurality of connecting portions 164 are arranged along the outer circumference of the body 162 in the shape of a ring, and the first end of the connecting portion 164 is connected with the body 162, and the second end of the connecting portion 164 is connected with the first core block 110, so that the body 162 can support the first core block 110 through the connecting portion 164, so that the plurality of first core blocks 110 can form a whole, thereby reducing the assembling steps of the rotor assembly, reducing the assembling difficulty of the rotor assembly, and improving the assembling efficiency of the rotor assembly.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 2 and 4, the supporting member 160 further includes a supporting portion 166, the supporting portion 166 is disposed between two adjacent connecting portions 164 of the plurality of connecting portions 164, a first end is connected to the body 162, and a second end abuts against the magnetic member 200.

In this embodiment, the support 160 further includes a support portion 166, and the support portion 166 is disposed between two adjacent connecting portions 164, that is, the support portion 166 is located opposite to the mounting groove 130. After the magnetic member 200 is mounted in the mounting groove 130, the supporting portion 166 can support the magnetic member 200, so as to improve the accuracy of the position of the magnetic member 200 in the mounting groove 130, and further improve the overall performance of the motor.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 6, the plurality of connection portions 164 may be injection molded or injection molded magnetic pieces.

In this embodiment, the plurality of connection portions 164 are injection-molded or injection-molded magnetic members, that is, the rotor core 100 does not need to be provided with the connection portions 164, but the connection between the first core block 110 and the connection portions 164 is achieved by injection-molding the connection portions 164 together when the magnetic members 200 and the connection members 300 are injection-molded.

The second core block 150 may also be connected to the body 162 by injection molding or injection molding a magnetic member.

As shown in fig. 1 and 2, the plurality of connection parts 164, the body 162, and the first core block 110 may also be of a unitary structure.

The connecting portion 164, the body 162 and the first core block 110 are integrally formed, so that the punched sheet of the rotor core 100 can be formed into the connecting portion 164, the body 162 and the first core block 110 at one time, and then the punched sheet of the rotor core 100 is stacked along the axial direction, thereby forming the rotor core 100.

The present embodiment provides a rotor assembly, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 6, the rotor assembly further includes a second positioning portion 170, where the second positioning portion 170 is disposed on the first core block 110 and/or the second core block 150, and the second positioning portion 170 is a through hole penetrating along an axial direction of the first core block 110 and/or the second core block 150.

In this embodiment, when the rotor assembly is injection molded, the second positioning portions 170 disposed on the plurality of first core blocks 110 and the second core blocks 150 can be matched with the positioning pins in the injection mold, so as to realize positioning between the first core blocks 110 and the second core blocks 150 and the injection mold, improve the accuracy of the positions of the first core blocks 110 and the second core blocks 150, and further improve the injection molding precision of the magnetic member 200.

The first core block 110 and the second core block 150 may be provided with the second positioning portion 170, or the second positioning portion 170 may not be provided, and under the condition that the second positioning portion 170 is not provided, the first positioning portion 140 may be matched with the positioning component in the mold, so that positioning between the first core block 110 and the second core block 150 and the mold is achieved.

In one embodiment of the invention, an electric machine is provided comprising a rotor assembly according to any of the embodiments described above, whereby the electric machine has all the advantages of the rotor assembly according to any of the embodiments described above.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 7, the motor further includes a stator assembly 500, and a rotor assembly is embedded inside the stator assembly 500. The stator assembly 500 includes a stator core 510 and a coil 520. The stator core 510 includes a plurality of stator teeth 512, the plurality of stator teeth 512 being arranged in a circumferential direction, stator slots 514 being formed between adjacent ones of the plurality of stator teeth 512; the coil 520 is wound around the stator teeth 512 and is embedded in the stator slot 514.

In this embodiment, the rotor assembly is embedded inside the stator assembly 500, and the rotor assembly serves as an inner rotor capable of rotating under the driving of the stator assembly 500.

The stator assembly 500 includes a stator core 510 and a coil 520, the stator core 510 includes a plurality of stator teeth 512, stator slots 514 are formed between adjacent stator teeth 512 of the plurality of stator teeth 512, the coil 520 is wound around the stator teeth 512 and embedded in the stator slots 514, and after the coil 520 is energized, the rotor assembly can be driven to rotate.

The direction indicated by the arrow in fig. 7 is the magnetizing direction of the magnetic member 200.

The present embodiment provides a motor, which further includes the following technical features in addition to the technical features of the above embodiments.

The number of poles of the rotor assembly is equal to or greater than the number of stator slots 514.

In this embodiment, the number of poles of the rotor assembly is greater than or equal to the number of stator slots 514, so that the pole arcs of the rotor assembly are greater, thereby improving the efficiency of the motor.

In one embodiment of the invention, an electrical appliance is provided comprising a motor as in any of the embodiments described above, whereby the electrical appliance has all the advantages of the motor of any of the embodiments described above.

The electric appliance includes an air conditioner, a refrigerator, a washing machine, or a dishwasher.

In particular, the motor can be applied to the occasions of household appliances such as fans, air-conditioning compressors, refrigerator compressors, drum washing machines and the like.

In one embodiment of the invention, a vehicle is provided comprising an electric machine according to any of the embodiments described above, whereby the vehicle has all the advantages of an electric machine according to any of the embodiments described above.

Vehicles include electric motor vehicles, hybrid motor vehicles or electric bicycles.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

In the claims, specification and drawings of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and making the description process easier, and not for the purpose of indicating or implying that the device or element in question must have the particular orientation described, be constructed and operated in the particular orientation, and therefore such description should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly, and may be, for example, a fixed connection between a plurality of objects, a removable connection between a plurality of objects, or an integral connection; the objects may be directly connected to each other or indirectly connected to each other through an intermediate medium. The specific meaning of the terms in the present invention can be understood in detail from the above data by those of ordinary skill in the art.

In the claims, specification, and drawings of the present invention, the descriptions of terms "one embodiment," "some embodiments," "particular embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (17)

1. A rotor assembly, comprising:

a support;

a rotor core including a plurality of first core blocks and second core blocks, the plurality of first core blocks being connected with the support, and being arranged along a circumferential direction of the support;

The second iron core blocks are arranged between adjacent first iron core blocks in the plurality of first iron core blocks, and the first iron core blocks adjacent to the second iron core blocks in the plurality of first iron core blocks and the second iron core blocks are arranged at intervals and form mounting grooves;

the plurality of first iron core blocks and/or the second iron core blocks are provided with connecting grooves;

the magnetic piece is embedded in the mounting groove;

and the connecting piece is embedded in the connecting groove.

2. The rotor assembly of claim 1 wherein the magnetic member is an injection molded magnetic member; and/or

The connecting piece is an injection molding piece or an injection molding magnetic piece.

3. The rotor assembly of claim 1 wherein the remanence of the magnetic member is a first remanence and the remanence of the connecting member is a second remanence, the first remanence being 10 times or more the second remanence.

4. The rotor assembly of claim 1, further comprising:

the first positioning part is positioned on the periphery of the magnetic piece, the first end of the first positioning part is connected with one of the plurality of first iron core blocks or the second iron core block, and the second end of the first positioning part extends in the mounting groove along the circumferential direction.

5. The rotor assembly of claim 1 wherein the number of magnetic elements is a plurality, wherein the magnetization directions of adjacent ones of the plurality of magnetic elements are circumferentially opposite or facing away from each other.

6. The rotor assembly of claim 1, wherein the connecting slot is a through hole penetrating the plurality of first core blocks or the second core blocks in an axial direction of the plurality of first core blocks or the second core blocks; or (b)

The connecting grooves are grooves recessed from the side walls of the first iron core blocks or the second iron core blocks to the axis.

7. The rotor assembly of any one of claims 1 to 6 wherein the radial cross-section of the attachment slot is circular, elliptical, triangular, rectangular, pentagonal or hexagonal in shape.

8. The rotor assembly of any one of claims 1 to 6, further comprising:

the support frame is arranged at the end part of the rotor core in the axial direction, is arranged along the circumferential direction of the rotor core and is connected with the connecting piece.

9. The rotor assembly of claim 8 wherein the support bracket is an injection molded part or an injection molded magnetic part.

10. The rotor assembly of any one of claims 1 to 6, wherein the support comprises:

the body is annular;

the plurality of connecting portions, each connecting portion in the plurality of connecting portions extends along the radial direction of rotor core, the first end of a plurality of connecting portions with the body is connected, and the second end is connected with a plurality of first iron core pieces respectively.

11. The rotor assembly of claim 10 wherein the support further comprises:

the support part is arranged between two adjacent connecting parts in the connecting parts, the first end of the support part is connected with the body, and the second end of the support part is propped against the magnetic piece.

12. The rotor assembly of claim 10 wherein the plurality of connections are injection molded pieces or injection molded magnetic pieces; or (b)

The connecting parts, the body and the first iron core block are of an integrated structure.

13. The rotor assembly of any one of claims 1 to 6, further comprising:

the second positioning part is arranged on the first iron core block and/or the second iron core block, and the second positioning part is a through hole penetrating along the axial direction of the first iron core block and/or the second iron core block.

14. An electric machine comprising a rotor assembly as claimed in any one of claims 1 to 13.

15. The electric machine of claim 14, further comprising:

the stator assembly is embedded into the inner side of the stator assembly;

the stator assembly comprises a stator core and a coil;

the stator core comprises a plurality of stator teeth, wherein the plurality of stator teeth are arranged along the circumferential direction, and stator grooves are formed between adjacent stator teeth in the plurality of stator teeth;

the coil is wound on the stator teeth and embedded in the stator grooves.

16. An electrical appliance comprising a motor as claimed in claim 14 or 15.

17. A vehicle comprising an electric machine as claimed in claim 14 or 15.