CN220368533U

CN220368533U - Rotor assembly, motor and household appliance

Info

Publication number: CN220368533U
Application number: CN202322005302.5U
Authority: CN
Inventors: 李萍; 胡义明; 张春成; 屈欢
Original assignee: Midea Welling Motor Technology Shanghai Co Ltd; Welling Wuhu Motor Manufacturing Co Ltd
Current assignee: Midea Welling Motor Technology Shanghai Co Ltd; Welling Wuhu Motor Manufacturing Co Ltd
Priority date: 2023-07-28
Filing date: 2023-07-28
Publication date: 2024-01-19
Anticipated expiration: 2033-07-28

Abstract

The utility model provides a rotor assembly, a motor and a household appliance, wherein the rotor assembly comprises: a rotating shaft; the rotor iron core comprises a plurality of sub-iron cores, the sub-iron cores are distributed along the circumferential direction of the rotating shaft, and a mounting groove is formed between two adjacent sub-iron cores; the permanent magnets are arranged in one mounting groove; the plastic package piece is integrally formed by injection molding and is used for connecting the rotating shaft, the rotor iron core and the permanent magnets; the plastic package piece comprises a first limiting part and a second limiting part, wherein the first limiting part is arranged on the radial inner side of the permanent magnet, and/or the second limiting part is arranged on the radial outer side of the permanent magnet.

Description

Rotor assembly, motor and household appliance

Technical Field

The utility model relates to the technical field of motors, in particular to a rotor assembly, a motor and a household appliance.

Background

With the development of the home appliance industry, high energy efficiency products are becoming trend, and higher energy efficiency requirements are also being put forth for motors playing an important role in the home appliance industry, so that in order to improve the motor efficiency, the use of magnetic bridge characteristics which generate loss needs to be reduced as far as possible, so that the rotor core is developed from the integral rotor to the segmented rotor core, and the magnetic bridge is disconnected to reduce the loss.

At present, in order to greatly improve efficiency, the inner magnetic bridge and the outer magnetic bridge are considered to be cancelled in the axial direction of the segmented rotor in most or all directions, which is equivalent to weakening or canceling the limit characteristic of the magnetic steel, and the strength and manufacturability of parts are reduced.

In the related art, the rotor core and the magnetic steel are designed into a radially inner side and outer side tapered structure to take out the demagnetizing bridge and solve the problem of magnetic steel limit, however, the electromagnetic efficiency cannot be fully exerted by the arrangement, and the manufacturing cost of the motor is increased due to the special-shaped magnetic steel.

Disclosure of Invention

Embodiments of the present utility model aim to solve at least one of the technical problems existing in the prior art.

To this end, a first aspect of an embodiment of the utility model provides a rotor assembly.

A second aspect of an embodiment of the present utility model provides an electric machine.

A third aspect of an embodiment of the present utility model provides a home appliance.

In view of this, according to a first aspect of embodiments of the present utility model, there is provided a rotor assembly comprising: a rotating shaft; the rotor iron core comprises a plurality of sub-iron cores, the sub-iron cores are distributed along the circumferential direction of the rotating shaft, and a mounting groove is formed between two adjacent sub-iron cores; the permanent magnets are arranged in one mounting groove; the plastic package piece is integrally formed by injection molding and is used for connecting the rotating shaft, the rotor iron core and the permanent magnets; the plastic package piece comprises a first limiting part and a second limiting part, wherein the first limiting part is arranged on the radial inner side of the permanent magnet, and/or the second limiting part is arranged on the radial outer side of the permanent magnet.

The rotor assembly provided by the embodiment of the utility model comprises a rotating shaft, a rotor iron core, a plurality of permanent magnets and a plastic package piece, wherein the rotor iron core comprises a plurality of sub-iron cores which are distributed at intervals along the circumferential direction of the rotating shaft, and an installation groove is formed between two adjacent sub-iron cores, and each permanent magnet is arranged in one installation groove.

The plastic package connects the rotating shaft, the rotor core and the plurality of permanent magnets, that is, the rotating shaft, the rotor core and the plurality of permanent magnets are connected into an inseparable whole through the plastic package. The rotary shaft, the rotor iron core and the permanent magnets are connected into a whole in an injection molding mode, so that the rotary shaft rotor iron core has higher manufacturability, the production efficiency can be improved, and the production cost is reduced.

The plastic package piece comprises a first limiting part and a second limiting part, wherein the first limiting part is arranged on the radial inner side of the permanent magnet, and/or the second limiting part is arranged on the radial outer side of the permanent magnet.

Specifically, along the radial direction of the rotor core, the first limiting portion is disposed inside the permanent magnet, thereby limiting the permanent magnet radially inside.

Or, the second limiting part is arranged at the outer side of the permanent magnet along the radial direction of the rotor core, so that the limit is formed at the outer side of the radial direction of the permanent magnet.

Or, the first limiting part is arranged on the radial inner side of the permanent magnet, and the second limiting part is arranged on the radial outer side of the permanent magnet. Thereby forming a limit to the radially inner side and the radially outer side of the permanent magnet. The first limiting portion and the second limiting portion may be located radially inside and radially outside the same permanent magnet, or the first limiting portion may be located radially inside one permanent magnet, the second limiting portion may be located radially outside the other permanent magnet, and so on, which are not listed herein. The setting can be specifically performed according to actual needs.

Through setting up the plastic envelope spare that includes first spacing portion and second spacing portion, radially inboard and/or the radial outside formation spacing to the permanent magnet to can cancel part or cancel the magnetic bridge structure setting in the whole correlation technique to a certain extent, and then can reduce or avoid the electromagnetism eddy current loss that brings because of the existence of magnetic bridge structure, show promotion motor efficiency.

Compared with the prior art that the rotor core and the magnetic steel are designed into the structures with the gradually reduced radial inner side and the radially outer side to take the demagnetizing bridge structure and solve the problem of magnetic steel limiting, the permanent magnet is limited at the radial inner side and/or the radial outer side of the permanent magnet by arranging the first limiting part and the second limiting part, and the permanent magnet can be in a cuboid structure without special arrangement on the structure of the permanent magnet, so that the electromagnetic efficiency can be fully exerted, and meanwhile, the manufacturing cost of the rotor assembly is reduced.

Optionally, the radial inner side of each permanent magnet is provided with a first limit part, and meanwhile, the radial outer side of each permanent magnet is provided with a second limit part, so that a magnetic bridge structure in the related art can be canceled, namely, the magnetic bridge structure in the related art is not required to be arranged, electromagnetic eddy current loss caused by the existence of the magnetic bridge structure is avoided, and the motor efficiency is greatly improved.

In addition, the rotor assembly provided by the technical scheme of the utility model has the following additional technical characteristics:

in some technical solutions, optionally, the first limiting portion is provided with a first limiting groove, and a notch of the first limiting groove extends to an outer wall of the first limiting portion along a radial direction of the rotor core; and/or the second limiting part is provided with a second limiting groove, and the notch of the second limiting groove extends to the second limiting part along the radial direction of the rotor coreOuter wall of the part _。

In this technical scheme, first spacing portion is provided with first spacing groove, and the notch in first spacing groove extends to the outer wall of first spacing portion along rotor core's radial direction, that is to say, forms an opening on first spacing portion. It can be appreciated that in the process of manufacturing the rotor assembly, a protrusion can be arranged at the position of the mold corresponding to the first limiting groove, and the radial inner side of the permanent magnet is limited by the protrusion, so that the manufacturability and the production efficiency of the rotor assembly are improved.

The second limiting part is provided with a second limiting groove, and the notch of the second limiting groove extends to the outer wall of the second limiting part along the radial direction of the rotor core, that is to say, an opening is formed in the second limiting part. It can be understood that in the process of manufacturing the rotor assembly, a protrusion can be arranged at the position of the mold corresponding to the second limiting groove, and the radial outer side of the permanent magnet is limited by the protrusion, so that the manufacturability and the production efficiency of the rotor assembly are improved.

It can be understood that the outer wall of the first limiting part is a side wall of the first limiting part, which is away from the permanent magnet. The outer wall of the second limiting part is a side wall of the second limiting part, which is away from the permanent magnet.

It should be noted that, after injection molding is completed and the mold is released, the first limiting groove may be formed on the first limiting portion and/or the second limiting groove may be formed on the second limiting portion.

In some technical solutions, optionally, the plastic package further includes a first end plate and a second end plate, and the first end plate and the second end plate are located at two sides of the rotor core along an axial direction of the rotor core and are connected to the first limiting portion and the second limiting portion.

In this technical scheme, it still includes first end plate and second end plate to have limited the plastic envelope, specifically, first end plate and second end plate are located rotor core axial direction's both sides to can form axial spacing to a plurality of permanent magnets and a plurality of sub-iron cores, ensure rotor assembly's connection reliability.

The first limiting portion is connected with the first end plate and the second end plate, that is, one end of the first limiting portion is connected with the first end plate, and the other end of the first limiting portion is connected with the second end plate. Meanwhile, the second limiting part is connected with the first end plate and the second end plate, that is, one end of the second limiting part is connected with the first end plate, and the other end of the second limiting part is connected with the second end plate. Therefore, the first limiting part and the second limiting part can be reliably fixed while the plurality of sub-iron cores and the plurality of permanent magnets are axially limited, the reliability of radial limiting of the permanent magnets by the first limiting part and the second limiting part can be further improved, the connection stability of the rotor assembly is further improved, and the running stability and the reliability of the motor with the rotor assembly are improved.

It will be appreciated that two adjacent sub-cores may provide circumferential restraint for the permanent magnets positioned between the two sub-cores. Meanwhile, two adjacent permanent magnets can provide circumferential limit for the sub-iron cores positioned between the two permanent magnets.

In some technical schemes, optionally, at least one sub-iron core is provided with a connecting port; the plastic package piece further comprises a connecting part, wherein the connecting part is filled in the connecting port and is connected with the first end plate and the second end plate.

In this technical scheme, it still includes connecting portion to have limited the plastic envelope piece, is provided with the connector on specifically at least one sub-iron core, and it can be understood that along the axial direction of rotor core, the connector link up the both ends face of sub-iron core.

The connecting portion is filled in the connecting port, the connecting portion is connected with the first end plate and the second end plate, the first end plate and the second end plate which are axially arranged on the rotor iron core are guaranteed to be connected with the connecting portion into a whole, the rotating shaft, the plurality of sub-iron cores and the plurality of permanent magnets are further guaranteed to be connected into a whole, and the connecting portion can also limit at least one sub-iron core in the radial direction, so that the overall connecting strength of the rotor assembly can be effectively improved, the overall structural stability and the reliability of the rotor assembly are improved, and reliable operation of a motor with the rotor assembly is guaranteed.

Optionally, be equipped with a connector on every sub-iron core, the quantity of connecting portion is a plurality of, and every connecting portion fills behind a connector, is connected with first end plate and second end plate to can further improve the holistic joint strength of rotor subassembly, improve the holistic structural stability of rotor subassembly.

In some aspects, optionally, the at least one sub-core includes at least one first die and a plurality of second dies stacked in an axial direction; the first punching sheet is provided with a first magnetic bridge, and the first magnetic bridge is positioned on the radial inner side of the permanent magnet; and/or the first punching sheet is provided with a second magnetic bridge, and the second magnetic bridge is positioned on the radial outer side of the permanent magnet.

In this technical solution, it is defined that the at least one sub-core includes at least one first punched piece and a plurality of second punched pieces, the at least one first punched piece and the plurality of second punched pieces being stacked along an axial direction of the rotating shaft.

The first punching sheet is provided with a first magnetic bridge and/or the first punching sheet is provided with a second magnetic bridge, specifically, the first magnetic bridge is positioned at the radial inner side of the permanent magnet, and the second magnetic bridge is positioned at the radial outer side of the permanent magnet.

That is, the first magnetic bridge is provided on the first punched sheet, and the first magnetic bridge is located inside the permanent magnet in the radial direction of the rotor core.

Or, the first punching sheet is provided with a second magnetic bridge, and the second magnetic bridge is positioned at the outer side of the permanent magnet along the radial direction of the rotor core.

Or, the first punching sheet is provided with a first magnetic bridge and a second magnetic bridge, wherein the first magnetic bridge is positioned at the inner side of the permanent magnet along the radial direction of the rotor core, and the second magnetic bridge is positioned at the outer side of the permanent magnet. Specifically, the first magnetic bridge and the second magnetic bridge may be located radially inside and radially outside, respectively, the same permanent magnet. Alternatively, the first magnetic bridge is located radially inward of one permanent magnet, the second magnetic bridge is located radially outward of the other permanent magnet, and so on. The setting can be specifically performed according to actual needs.

It can be appreciated that before the rotor assembly is injection molded, that is, the first limiting portion and the second limiting portion for radially limiting the permanent magnet are not formed, the permanent magnet is easy to radially move, and the yield of the rotor assembly is reduced.

The at least one sub-iron core comprises a first punching sheet provided with a first magnetic bridge and/or a second magnetic bridge, so that the radial limiting effect on the permanent magnet is realized before the rotor assembly is subjected to injection molding, the overall structural stability of the rotor assembly is improved, the permanent magnet can be prevented from moving radially in the injection molding process, and the manufacturability and the yield of the rotor assembly are improved.

It is understood that the first magnetic bridge is located between two adjacent first limiting portions, and the second magnetic bridge is located between two adjacent second limiting portions. Therefore, when the permanent magnet is limited in the radial direction, the two adjacent first magnetic bridges are disconnected through the first limiting part, and the two adjacent second magnetic bridges are disconnected through the second limiting part, namely, the length of the magnetic bridge structure in the circumferential direction is reduced, so that the electromagnetic loss is reduced, and the motor efficiency is improved.

In addition, since the at least one sub-core includes at least one first punching sheet and a plurality of second punching sheets, wherein the first punching sheet is provided with the first magnetic bridge and/or the second magnetic bridge, that is, only a part of the magnetic bridge structure is arranged in the axial direction of the sub-core, thereby being capable of canceling the arrangement of the magnetic bridge structure in a part of the related art to a certain extent while ensuring the manufacturability of the rotor assembly, and further being capable of reducing the electromagnetic eddy current loss caused by the existence of the magnetic bridge structure and remarkably improving the motor efficiency. That is, the partial magnetic bridge structure in the axial direction is combined with the first limit part and the second limit part, so that the rotor assembly can be manufactured and reliable.

In some embodiments, optionally, the number of the first punching sheets is a plurality, and the plurality of first punching sheets are arranged at intervals.

In this technical solution, the plurality of first punched sheets are arranged at intervals, and it is understood that the first punched sheets and the second punched sheets are stacked along the axial direction of the rotating shaft, that is, the plurality of first punched sheets are arranged at intervals along the axial direction.

Namely, only a part of the magnetic bridge structure is arranged in the axial direction, so that the magnetic bridge structure in the related art can be canceled to a certain extent while the manufacturability of the rotor assembly is ensured, the electromagnetic eddy current loss caused by the existence of the magnetic bridge structure can be reduced, and the motor efficiency is obviously improved. That is, the partial magnetic bridge structure in the axial direction is combined with the first limit part and the second limit part, so that the rotor assembly can be manufactured and reliable.

In some aspects, optionally, the first die is located on one side of the plurality of second dies; and/or the first punched sheet is positioned between two adjacent second punched sheets.

In this solution, the first punched piece is located at one side of the plurality of second punched pieces, that is, the first punched piece is located at an end portion in the axial direction of the rotating shaft. Alternatively, when the number of the first punched pieces is plural, one of the first punched pieces is located at one end in the axial direction, and one of the remaining first punched pieces is located at the other end in the axial direction.

And/or the first punch is located between two adjacent second punches, that is, the first punch may be located at any position in the axial direction other than the end portion. The setting can be specifically performed according to actual needs.

It will be appreciated that the first laminations are located at the ends of the sub-cores in the axial direction, i.e. the first magnetic bridges and/or the second magnetic bridges are located at the ends. In the installation process of the rotor assembly, a guiding effect can be provided for the permanent magnet, the permanent magnet is convenient to insert into the installation groove formed by two adjacent sub-iron cores, and the installation efficiency of the rotor iron cores is improved.

The first punching sheet can be positioned at any position except the end part in the axial direction, namely, the first magnetic bridge and/or the second magnetic bridge are positioned at any position except the end part in the axial direction, so that the length of the variable cross-section characteristic of the first limiting part and/or the second limiting part at the corresponding position can be reduced, the thermal expansion and contraction force of the first limiting part and/or the second limiting part in the axial direction is dispersed, the stress of the first limiting part and/or the second limiting part under the cold and hot working condition is reduced, and the reliability of the rotor assembly is ensured.

In some technical schemes, optionally, the plastic package further comprises a mounting part, the mounting part is located between the rotating shaft and the first limiting part, the rotating shaft is located in an inner hole of the mounting part, and the mounting part is connected with the first limiting part.

In this technical scheme, it still includes the installation department to inject the plastic envelope piece to have limited, specifically, the pivot is located the hole of installation department, that is to say, when injection molding is accomplished and the demolding, the installation department parcel is in the outside of pivot. The installation part is located between pivot and the first spacing portion, and installation part and first spacing portion connect, that is to say, the pivot is located the inboard of permanent magnet radial direction, and the installation part is located between permanent magnet and the pivot.

It can be understood that the plastic package is an insulating part, namely, the installation part has an insulating effect, and the installation part is positioned between the permanent magnet and the rotating shaft, so that the insulation effect can be achieved between the permanent magnet and the rotating shaft, and the stability and the reliability of the operation of the motor with the rotor assembly are ensured.

It should be noted that, in the radial direction of the rotor core, in the case that the first limiting portion is provided at the inner side of the permanent magnet, the mounting portion is connected to the first limiting portion.

In some technical schemes, optionally, the installation department includes installation body and a plurality of strengthening rib, and wherein, the pivot is located the hole of installation body, and one side that the installation body deviates from the pivot is located to a plurality of strengthening ribs to along the circumference direction interval arrangement of pivot, a plurality of strengthening ribs link to each other with first spacing portion.

In this technical scheme, it includes installation body and a plurality of strengthening rib to have limited the installation portion, and specifically, a plurality of strengthening ribs locate the installation body and deviate from one side of pivot. It is understood that, in the radial direction of the rotor core, in the case where the first limit portion is provided at the inner side of the permanent magnet, the plurality of reinforcing ribs are connected with the first limit portion and the mounting body.

Through setting up a plurality of strengthening ribs in the one side that the installation body is close to a plurality of permanent magnets and a plurality of sub-iron cores, can improve the holistic joint strength of rotor subassembly, and then improve rotor subassembly's structural stability and reliability.

In addition, a plurality of strengthening ribs are arranged along circumference interval, that is to say, can form the breach between two adjacent strengthening ribs, namely form a plurality of breachs of interval on the installation department promptly to compare and set up the installation department into solid structure, can reduce the quantity of injection molding material when realizing effective connection between a plurality of sub-iron cores, a plurality of permanent magnet and the pivot, and then reduce rotor assembly's manufacturing cost.

In addition, a plurality of gaps are formed on the mounting part at intervals, so that the problem of large deformation caused by uneven thickness design of the rotor assembly can be solved, and the structural stability and reliability of the rotor assembly are further improved.

In some embodiments, optionally, the outer wall of the rotating shaft is provided with a concave-convex structure.

In this technical scheme, the outer wall of pivot is provided with concave-convex structure to after the completion of moulding plastics and demolding, can improve the joint strength between pivot and the installation department, guarantee rotor assembly's torque transmission ability, guarantee the effective transmission of power promptly, promote the running stability and the reliability of the motor that have this rotor assembly.

In some technical schemes, optionally, at least one of the sub-cores is further provided with a positioning hole, and the positioning hole is exposed out of the plastic package.

In the technical scheme, at least one sub-iron core is limited, and a positioning hole is further formed in the sub-iron core, and is exposed out of the plastic package piece after injection molding is completed and the mold is removed.

It can be appreciated that the positioning hole is used for positioning the sub-iron core in the installation process of the rotor assembly, so that at least one sub-iron core can be prevented from radial movement or axial rotation in the installation process of the rotor assembly, the position accuracy of at least one sub-iron core and the roundness of the whole rotor assembly are ensured, and the reliability of the rotor assembly after installation is further ensured.

In some embodiments, optionally, the at least one positioning hole comprises a positioning groove and a balancing groove, wherein the balancing groove is in communication with the positioning groove, and the balancing groove is located radially outward of the positioning groove.

In this technical solution, it is defined that the at least one positioning hole includes a positioning groove and a balancing groove, in particular, the balancing groove communicates with the positioning groove, and the balancing groove is located outside the positioning groove in the radial direction of the rotor core, that is, the positioning hole is composed of the positioning groove and the balancing groove. It will be appreciated that the detents are used to locate the sub-cores during installation of the rotor assembly. Therefore, radial movement or axial rotation of the sub-iron core can be prevented in the installation process of the rotor assembly, the position accuracy of the sub-iron core and the roundness of the whole rotor assembly are ensured, and the reliability of the rotor assembly after installation is further ensured.

The balancing slots are used for installing dynamic balance round rivets, and it is understood that in the process of installing the rotor assembly, unbalance amount of the rotor assembly needs to be adjusted, namely, the dynamic balance round rivets can be installed in at least one balancing slot according to the actual unbalance amount.

Furthermore, the structure of the sub-core can be simplified by forming the positioning hole from the positioning groove and the balance groove.

In some embodiments, optionally, the cross-sectional shape of the detent includes at least partially circular, at least partially triangular, at least partially fan-shaped, or at least partially rectangular; and/or the cross-sectional shape of the balancing groove comprises at least a partial circle.

In this embodiment, the shapes of the positioning groove and the balance groove are defined.

Specifically, the cross-sectional shape of the positioning groove is at least a part of a circle, or at least a part of a triangle, or at least a part of a sector, or at least a part of a rectangle.

The cross-sectional shape of the balancing groove is at least a portion of the run. That is, combining a part of a circle with a part of a circle, a part of a triangle, a part of a sector, or a part of a rectangle to form a positioning hole of a non-pure circle ensures that the unbalance amount of the rotor assembly can be adjusted during the installation of the rotor assembly while the sub-cores do not move radially or rotate axially.

According to a second aspect of the present utility model, there is provided an electric machine comprising a rotor assembly according to any of the above-mentioned aspects, thereby providing all the advantageous technical effects of the rotor assembly, which are not described in detail herein.

Further, the motor further comprises a stator, and the stator is arranged on the outer side of the rotor assembly.

According to a third aspect of the present utility model, there is provided a household appliance comprising a rotor assembly as provided in the first aspect or a motor as provided in the second aspect, thereby providing all the advantages of the rotor assembly or the motor, and not described in detail herein.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model 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 illustrates one of the structural schematic diagrams of a rotor assembly according to one embodiment of the present utility model;

FIG. 2 illustrates a second schematic structural view of a rotor assembly according to one embodiment of the present disclosure;

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

FIG. 4 shows a fourth schematic structural view of a rotor assembly according to one embodiment of the present utility model;

FIG. 5 illustrates a fifth structural schematic of a rotor assembly according to one embodiment of the present disclosure;

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

fig. 7 shows one of schematic structural views of a sub-core according to an embodiment of the present utility model;

fig. 8 shows a second schematic structural view of a sub-core according to an embodiment of the present utility model;

Fig. 9 shows a third schematic structural view of a sub-core according to an embodiment of the present utility model;

fig. 10 shows a fourth schematic structural view of a sub-core according to an embodiment of the present utility model;

fig. 11 shows a fifth structural schematic diagram of a sub-core according to an embodiment of the present utility model;

fig. 12 shows a sixth schematic structural view of a sub-core according to an embodiment of the present utility model;

fig. 13 shows a seventh schematic structural view of a sub-core according to an embodiment of the present utility model;

fig. 14 shows an eighth schematic structural view of a sub-core according to an embodiment of the present utility model;

fig. 15 shows a ninth schematic structural view of a sub-core according to an embodiment of the present utility model;

FIG. 16 shows one of the structural schematic diagrams of the spindle according to one embodiment of the utility model;

FIG. 17 shows a second schematic structural view of a spindle according to one embodiment of the present utility model;

FIG. 18 shows a third schematic structural view of a spindle according to one embodiment of the present utility model.

The correspondence between the reference numerals and the component names in fig. 1 to 18 is:

100 rotor components, 110 rotor cores, 111 sub cores, 120 mounting grooves, 130 permanent magnets, 140 plastic packages, 141 first limiting parts, 142 first end plates, 143 second end plates, 144 connecting parts, 145 mounting parts, 146 mounting bodies, 147 reinforcing ribs, 148 second limiting parts, 151 first limiting grooves, 152 second limiting grooves, 160 connecting ports, 171 first magnetic bridges, 172 second magnetic bridges, 180 rotating shafts, 190 positioning holes, 191 positioning grooves, 192 balancing grooves, 210 concave-convex structures, 230 first punching sheets and 240 second punching sheets.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model 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 utility model, however, the present utility model may be practiced otherwise than as described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

A rotor assembly 100, a motor, and a home appliance provided according to some embodiments of the present utility model are described below with reference to fig. 1 to 18.

In one embodiment according to the present application, as shown in fig. 1, 2, 3, 4, 5 and 6, a rotor assembly 100 is proposed, the rotor assembly 100 comprising: a rotation shaft 180; a rotor core 110, the rotor core 110 including a plurality of sub-cores 111, the plurality of sub-cores 111 being arranged along a circumferential direction of the rotating shaft 180, and an installation groove 120 being formed between two adjacent sub-cores 111; a plurality of permanent magnets 130, each permanent magnet 130 being disposed within one of the mounting slots 120; the plastic package 140 is injection molded integrally for connecting the rotating shaft 180, the rotor core 110 and the plurality of permanent magnets 130; the plastic package 140 includes a first limiting portion 141 and a second limiting portion 148, where the first limiting portion 141 is disposed on a radial inner side of the permanent magnet 130, and/or the second limiting portion 148 is disposed on a radial outer side of the permanent magnet 130.

The rotor assembly 100 provided by the embodiment of the utility model includes a rotating shaft 180, a rotor core 110, a plurality of permanent magnets 130 and a plastic package 140, specifically, the rotor core 110 includes a plurality of sub-cores 111, the plurality of sub-cores 111 are arranged at intervals along the circumferential direction of the rotating shaft 180, and a mounting groove 120 is formed between two adjacent sub-cores 111, and each permanent magnet 130 is disposed in one mounting groove 120.

The molding member 140 connects the rotation shaft 180, the rotor core 110, and the plurality of permanent magnets 130, that is, the rotation shaft 180, the rotor core 110, and the plurality of permanent magnets 130 are connected as an inseparable whole through the molding member 140. The rotary shaft 180, the rotor core 110 and the plurality of permanent magnets 130 are connected into a whole in an injection molding mode, so that the manufacturing efficiency is improved, and the production cost is reduced.

The plastic package 140 includes a first limiting portion 141 and a second limiting portion 148, the first limiting portion 141 is disposed radially inward of the permanent magnet 130, and/or the second limiting portion 148 is disposed radially outward of the permanent magnet 130.

Specifically, the first stopper 141 is provided inside the permanent magnet 130 in the radial direction of the rotor core 110, thereby forming a stopper for the permanent magnet 130 inside in the radial direction.

Alternatively, the second stopper 148 is provided at the outer side of the permanent magnet 130 in the radial direction of the rotor core 110, thereby forming a stopper for the permanent magnet 130 at the outer side in the radial direction.

Alternatively, the first stopper 141 is disposed radially inward of the permanent magnet 130, and the second stopper 148 is disposed radially outward of the permanent magnet 130. Thereby forming a limit to the radially inner and outer sides of the permanent magnet 130. The first limiting portion 141 and the second limiting portion 148 may be located radially inside and radially outside the same permanent magnet 130, or the first limiting portion 141 may be located radially inside one permanent magnet 130, the second limiting portion 148 may be located radially outside the other permanent magnet 130, and so on, which are not further described herein. The setting can be specifically performed according to actual needs.

By arranging the plastic package 140 comprising the first limiting part 141 and the second limiting part 148, the radial inner side and/or the radial outer side of the permanent magnet 130 are limited, so that the magnetic bridge structure arrangement in the related art can be canceled to a certain extent or all of the magnetic bridge structure arrangement can be canceled, electromagnetic eddy current loss caused by the existence of the magnetic bridge structure can be reduced or avoided, and the motor efficiency is remarkably improved.

Moreover, compared with the prior art that the rotor core and the magnetic steel are designed into the structures with the tapered radial inner and outer sides to take the demagnetizing bridge structure and solve the problem of magnetic steel limiting, the permanent magnet 130 is limited on the radial inner side and/or the radial outer side of the permanent magnet 130 by arranging the first limiting part 141 and the second limiting part 148, and the permanent magnet 130 can be arranged into a cuboid structure without special arrangement of the structure of the permanent magnet 130, so that the electromagnetic efficiency can be fully exerted and the manufacturing cost of the rotor assembly 100 can be reduced.

Optionally, the radial inner side of each permanent magnet 130 is provided with the first limiting portion 141, and at the same time, the radial outer side of each permanent magnet 130 is provided with the second limiting portion 148, so that the magnetic bridge structure in the related art can be omitted, that is, the magnetic bridge structure in the related art is not required to be provided, electromagnetic eddy current loss caused by the existence of the magnetic bridge structure is avoided, and the motor efficiency is greatly improved.

As shown in fig. 1, 2, 3 and 5, in some embodiments, optionally, the first limiting part 141 is provided with a first limiting groove 151, and a notch of the first limiting groove 151 extends to an outer wall of the first limiting part 141 in a radial direction of the rotor core 110; and/or the second limiting portion 148 is provided with a second limiting groove 152, and a notch of the second limiting groove 152 extends to an outer wall of the second limiting portion 148 in a radial direction of the rotor core 110.

In this embodiment, the first limiting portion 141 is provided with the first limiting groove 151, and the notch of the first limiting groove 151 extends to the outer wall of the first limiting portion 141 in the radial direction of the rotor core 110, that is, an opening is formed on the first limiting portion 141. It can be appreciated that in the process of manufacturing the rotor assembly 100, a protrusion may be disposed at a position of the mold corresponding to the first limiting groove 151, and the protrusion is utilized to limit the radial inner side of the permanent magnet 130, so as to improve manufacturability and production efficiency of the rotor assembly 100.

The second limiting portion 148 is provided with a second limiting groove 152, and a notch of the second limiting groove 152 extends to an outer wall of the second limiting portion 148 in a radial direction of the rotor core 110, that is, an opening is formed in the second limiting portion 148. It can be appreciated that in the process of manufacturing the rotor assembly 100, a protrusion may be disposed at a position of the mold corresponding to the second limiting groove 152, and the protrusion is utilized to limit the radial outer side of the permanent magnet 130, so as to improve manufacturability and production efficiency of the rotor assembly 100.

It can be understood that the outer wall of the first limiting portion 141 is a side wall of the first limiting portion 141 facing away from the permanent magnet 130. The outer wall of the second limiting portion 148 is a side wall of the second limiting portion 148 facing away from the permanent magnet 130.

It should be noted that, after the injection molding is completed and the mold is removed, the first limiting groove 151 may be formed on the first limiting portion 141 and/or the second limiting groove 152 may be formed on the second limiting portion 148.

Optionally, in the circumferential direction of the rotor core 110, the width of the notch of the first limiting groove 151 is smaller than the width of the permanent magnet 130, and/or the width of the notch of the second limiting groove 152 is smaller than the width of the permanent magnet 130, so that manufacturability of the rotor assembly 100 is improved while ensuring that the first limiting portion 141 limits the radially inner side of the permanent magnet 130, and/or the second limiting portion 148 limits the radially outer side of the permanent magnet 130.

As shown in fig. 5 and 6, in some embodiments, the molding member 140 may further include a first end plate 142 and a second end plate 143, and the first end plate 142 and the second end plate 143 are located at both sides of the rotor core 110 in an axial direction of the rotor core 110 and connected to the first limit portion 141 and the second limit portion 148.

In this embodiment, it is defined that the molding compound 140 further includes a first end plate 142 and a second end plate 143, and in particular, the first end plate 142 and the second end plate 143 are located at both sides of the rotor core 110 in the axial direction, so that axial limitation can be formed on the plurality of permanent magnets 130 and the plurality of sub-cores 111, and connection reliability of the rotor assembly 100 is ensured.

The first limiting portion 141 is connected to the first end plate 142 and the second end plate 143, that is, one end of the first limiting portion 141 is connected to the first end plate 142 and the other end of the first limiting portion 141 is connected to the second end plate 143. Meanwhile, the second limiting portion 148 is connected to the first end plate 142 and the second end plate 143, that is, one end of the second limiting portion 148 is connected to the first end plate 142 and the other end of the second limiting portion 148 is connected to the second end plate 143. Therefore, the first limiting portion 141 and the second limiting portion 148 can be reliably fixed while the plurality of sub-cores 111 and the plurality of permanent magnets 130 are axially limited, and further the reliability of radial limiting of the permanent magnets 130 by the first limiting portion 141 and the second limiting portion 148 can be improved, the connection stability of the rotor assembly 100 is further improved, and the running stability and reliability of the motor with the rotor assembly 100 are improved.

It will be appreciated that adjacent two sub-cores 111 may provide circumferential restraint to the permanent magnet 130 located between the two sub-cores 111. Meanwhile, adjacent two permanent magnets 130 may provide circumferential limitation to the sub-core 111 located between the two permanent magnets 130.

As shown in fig. 1, 2, 3, 4, 7, 8, 9, 10, 11, 12, 13, 14, and 15, in some embodiments, optionally, a connection port 160 is provided on at least one sub-core 111; the molding member 140 further includes a connection portion 144, and the connection portion 144 is filled in the connection port 160 and connected to the first end plate 142 and the second end plate 143.

In this embodiment, the plastic package 140 is defined to further include a connection portion 144, specifically, at least one sub-core 111 is provided with a connection port 160, and it is understood that the connection port 160 penetrates both end surfaces of the sub-core 111 in the axial direction of the rotor core 110.

The connecting portion 144 is filled in the connecting port 160, and the connecting portion 144 is connected with the first end plate 142 and the second end plate 143, so that the first end plate 142 and the second end plate 143 in the axial direction of the rotor core 110 are ensured to be connected with the connecting portion 144 into a whole, and further, the rotating shaft 180, the plurality of sub-cores 111 and the plurality of permanent magnets 130 are ensured to be connected into a whole, and the connecting portion 144 can also limit at least one sub-core 111 in the radial direction, so that the overall connection strength of the rotor assembly 100 can be effectively improved, the overall structural stability and reliability of the rotor assembly 100 are improved, and further, the reliable operation of a motor with the rotor assembly 100 is ensured.

Optionally, each sub-core 111 is provided with a plurality of connection ports 160, and each connection port 144 is filled with a plurality of connection ports 160 and then connected with the first end plate 142 and the second end plate 143, so that the overall connection strength of the rotor assembly 100 can be further improved, and the overall structural stability of the rotor assembly 100 can be improved.

Alternatively, the cross-sectional shape of the connection port 160 includes, but is not limited to, circular, triangular, or fan-shaped. In particular, it can be set according to the actual rotor size. To reduce the impact on motor efficiency while ensuring overall connection strength of the rotor assembly 100.

As shown in fig. 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15, in some embodiments, optionally, at least one sub-core 111 includes at least one first die 230 and a plurality of second dies 240 stacked in an axial direction; the first punched sheet 230 is provided with a first magnetic bridge 171, the first magnetic bridge 171 being located radially inward of the permanent magnet 130; and/or the first punched sheet 230 is provided with a second magnetic bridge 172, the second magnetic bridge 172 being located radially outside the permanent magnet 130.

In this embodiment, it is defined that the at least one sub-core 111 includes at least one first die 230 and a plurality of second dies 240, and the at least one first die 230 and the plurality of second dies 240 are stacked in an axial direction of the rotating shaft 180.

The first punched sheet 230 is provided with a first magnetic bridge 171 and/or the first punched sheet 230 is provided with a second magnetic bridge 172, specifically, the first magnetic bridge 171 is located radially inward of the permanent magnet 130 and the second magnetic bridge 172 is located radially outward of the permanent magnet 130.

That is, the first magnetic bridge 171 is provided on the first lamination 230, and the first magnetic bridge 171 is located inside the permanent magnet 130 in the radial direction of the rotor core 110.

Alternatively, the first lamination 230 is provided with the second magnetic bridge 172, and the second magnetic bridge 172 is located outside the permanent magnet 130 in the radial direction of the rotor core 110.

Alternatively, the first lamination 230 is provided with a first magnetic bridge 171 and a second magnetic bridge 172, wherein the first magnetic bridge 171 is located inside the permanent magnet 130 and the second magnetic bridge 172 is located outside the permanent magnet 130 in the radial direction of the rotor core 110. Specifically, the first and second magnetic bridges 171 and 172 may be located radially inward and radially outward of the same permanent magnet 130, respectively. Alternatively, the first magnetic bridge 171 is located radially inward of one permanent magnet 130, the second magnetic bridge 172 is located radially outward of the other permanent magnet 130, and so on. The setting can be specifically performed according to actual needs.

It can be appreciated that, before the rotor assembly 100 is injection molded, that is, the first limiting portion 141 and the second limiting portion 148 that radially limit the permanent magnet 130 are not formed, the permanent magnet 130 is easy to move radially, and the yield of the rotor assembly 100 is reduced.

The at least one sub-core 111 includes the first punching sheet 230 provided with the first magnetic bridge 171 and/or the second magnetic bridge 172, so that a radial limiting effect on the permanent magnet 130 is achieved before the rotor assembly 100 is injection molded, the overall structural stability of the rotor assembly 100 is improved, meanwhile, the permanent magnet 130 can be ensured not to move radially in the injection molding process, and the manufacturability and the yield of the rotor assembly 100 are improved.

It is understood that the first magnetic bridge 171 is located between two adjacent first limiting portions 141, and the second magnetic bridge 172 is located between two adjacent second limiting portions 148. Therefore, when the permanent magnet 130 is limited in the radial direction, the two adjacent first magnetic bridges 171 are disconnected through the first limiting part 141, and the two adjacent second magnetic bridges 172 are disconnected through the second limiting part 148, namely, the length of the magnetic bridge structure in the circumferential direction is reduced, so that the electromagnetic loss is reduced, and the motor efficiency is improved.

In addition, since the at least one sub-core 111 includes at least one first lamination 230 and a plurality of second lamination 240, wherein the first lamination 230 is provided with the first magnetic bridge 171 and/or the second magnetic bridge 172, that is, only a part of the magnetic bridge structure is provided in the axial direction of the sub-core 111, it is possible to cancel the magnetic bridge structure arrangement in a part of the related art to a certain extent while ensuring the manufacturability of the rotor assembly 100, and thus it is possible to reduce the electromagnetic eddy current loss due to the existence of the magnetic bridge structure, and significantly improve the motor efficiency. That is, the partial magnetic bridge structure in the axial direction is combined with the first and second limit parts 141 and 148, so that the rotor assembly 100 can be manufactured with both manufacturability and reliability.

As shown in fig. 7, 8 and 9, in some embodiments, optionally, the number of first punches 230 is plural, and the plural first punches 230 are spaced apart.

In this embodiment, the plurality of first punches 230 are arranged at intervals, and it is understood that the first punches 230 and the second punches 240 are stacked in the axial direction of the rotary shaft 180, that is, the plurality of first punches 230 are arranged at intervals in the axial direction.

Namely, only a part of the magnetic bridge structure is arranged in the axial direction, so that the magnetic bridge structure arrangement in the related art can be canceled to a certain extent while the manufacturability of the rotor assembly 100 is ensured, the electromagnetic eddy current loss caused by the existence of the magnetic bridge structure can be reduced, and the motor efficiency is obviously improved. That is, the partial magnetic bridge structure in the axial direction is combined with the first and second limit parts 141 and 148, so that the rotor assembly 100 can be manufactured with both manufacturability and reliability.

As shown in fig. 7, 8, and 10, in some embodiments, optionally, the first die 230 is located on one side of the plurality of second dies 240; and/or the first die 230 is located between two adjacent second dies 240.

In this embodiment, the first punch 230 is located at one side of the plurality of second punches 240, that is, the first punch 230 is located at an end in the axial direction of the rotating shaft 180. Alternatively, in the case where the number of first punches 230 is plural, one of the first punches 230 is located at one end in the axial direction, and one of the remaining first punches 230 is located at the other end in the axial direction.

And/or the first die 230 is located between two adjacent second dies 240, that is, the first die 230 may be located at any position in the axial direction other than the end portion. The setting can be specifically performed according to actual needs.

It will be appreciated that the first punched piece 230 is located at an end of the sub-core 111 in the axial direction, i.e., the first magnetic bridge 171 is located at an end. In the installation process of the rotor assembly 100, a guiding function can be provided for the permanent magnet 130, so that the permanent magnet 130 can be conveniently inserted into the installation groove 120 formed by two adjacent sub-cores 111, and the installation efficiency of the rotor core 110 is improved.

The first punching sheet 230 may be located at any position except the end in the axial direction, that is, any position except the end in the axial direction of the first magnetic bridge 171 and/or the second magnetic bridge 172 may be located at any position except the end in the axial direction of the first magnetic bridge 171 and/or the second magnetic bridge 172, so that the length of the variable cross-section feature of the first limiting portion 141 and/or the second limiting portion 148 at the corresponding position may be reduced, the thermal expansion and contraction force of the first limiting portion 141 and/or the second limiting portion 148 in the axial direction may be dispersed, and then the stress of the first limiting portion 141 and/or the second limiting portion 148 under the cold and hot working condition may be reduced, so as to ensure the reliability of the rotor assembly 100.

As shown in fig. 1, 2, 3, 4, 5, and 6, in some embodiments, optionally, the plastic package 140 further includes a mounting portion 145, where the mounting portion 145 is located between the rotating shaft 180 and the first limiting portion 141, and the rotating shaft 180 is located in an inner hole of the mounting portion 145, where the mounting portion 145 is connected to the first limiting portion 141.

In this embodiment, the plastic package 140 is defined to further include a mounting portion 145, specifically, the rotation shaft 180 is located in an inner hole of the mounting portion 145, that is, when injection molding is completed and the mold is removed, the mounting portion 145 is wrapped around the outer side of the rotation shaft 180. The mounting portion 145 is located between the rotation shaft 180 and the first limiting portion 141, and the mounting portion 145 and the first limiting portion 141 are connected, that is, the rotation shaft 180 is located at the inner side of the permanent magnet 130 in the radial direction, and the mounting portion 145 is located between the permanent magnet 130 and the rotation shaft 180.

It can be appreciated that the plastic package 140 is an insulating member, that is, the mounting portion 145 has an insulating function, and since the mounting portion 145 is located between the permanent magnet 130 and the rotating shaft 180, it can perform an insulating function between the permanent magnet 130 and the rotating shaft 180, thereby ensuring the stability and reliability of the operation of the motor having the rotor assembly 100.

In the case where the first stopper portion 141 is provided inside the permanent magnet 130 in the radial direction of the rotor core 110, the mounting portion 145 is connected to the first stopper portion 141.

As shown in fig. 1, 2, 3, 4, 5 and 6, in some embodiments, optionally, the mounting portion 145 includes a mounting body 146 and a plurality of reinforcing ribs 147, where the rotating shaft 180 is located in an inner hole of the mounting body 146, and the plurality of reinforcing ribs 147 are located on a side of the mounting body 146 away from the rotating shaft 180 and are arranged at intervals along a circumferential direction of the rotating shaft 180, and the plurality of reinforcing ribs 147 are connected to the first limiting portion 141.

In this embodiment, the mounting portion 145 is defined to include a mounting body 146 and a plurality of reinforcing ribs 147, specifically, the plurality of reinforcing ribs 147 are provided on a side of the mounting body 146 facing away from the rotation shaft 180. It is understood that in the case where the first limit parts 141 are provided inside the permanent magnets 130 in the radial direction of the rotor core 110, the plurality of reinforcing ribs 147 are connected to the first limit parts 141 and the mounting body 146.

By providing the plurality of reinforcing ribs 147 on the side of the mounting body 146 adjacent to the plurality of permanent magnets 130 and the plurality of sub-cores 111, the overall connection strength of the rotor assembly 100 can be improved, and thus the structural stability and reliability of the rotor assembly 100 can be improved.

In addition, the plurality of reinforcing ribs 147 are arranged at intervals along the circumferential direction, that is, gaps can be formed between two adjacent reinforcing ribs 147, that is, a plurality of gaps are formed on the mounting portion 145 at intervals, so that compared with the case that the mounting portion 145 is provided with a solid structure, the use amount of injection molding materials can be reduced while effective connection among the plurality of sub-cores 111, the plurality of permanent magnets 130 and the rotating shaft 180 is realized, and the production cost of the rotor assembly 100 is further reduced.

In addition, the plurality of notches are formed at intervals on the mounting portion 145, so that the problem of large deformation caused by uneven thickness design of the rotor assembly 100 can be solved, and the structural stability and reliability of the rotor assembly 100 can be further improved.

As shown in fig. 16, 17 and 18, in some embodiments, the outer wall of the shaft 180 is optionally provided with a relief structure 210.

In this embodiment, the outer wall of the rotating shaft 180 is provided with the concave-convex structure 210, so that after injection molding is completed and the mold is removed, the connection strength between the rotating shaft 180 and the mounting portion 145 can be improved, the torque transmission capability of the rotor assembly 100 is ensured, that is, the effective transmission of power is ensured, and the operation stability and reliability of the motor with the rotor assembly 100 are improved.

Optionally, the relief structure 210 includes, but is not limited to, at least one of knurling, grooves, protrusions, and through holes as a rotational or movement limiting feature.

It can be appreciated that, when injection molding, the surface of the rotating shaft 180 wraps the injection molding body (i.e. the mounting portion 145), and by arranging the concave-convex structure 210 on the surface of the rotating shaft 180, the connection strength between the rotating shaft 180 and the injection molding body can be effectively improved, the effective connection between the rotating shaft 180 and the mounting portion 145 is ensured, and the effective transmission of power is realized.

It will be appreciated that if the concave-convex structure 210 includes a groove or a through hole, the groove or the through hole is filled with the injection molding material during injection molding, so as to improve the connection strength between the rotating shaft 180 and the mounting portion 145.

As shown in fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 and 15, in some embodiments, optionally, at least one of the sub-cores 111 is further provided with a positioning hole 190, where the positioning hole 190 is exposed out of the molding member 140.

In this embodiment, at least one sub-core 111 is further defined with a positioning hole 190, and when the injection molding is completed and the mold is released, the positioning hole 190 is exposed to the molding member 140.

It will be appreciated that the positioning hole 190 is used to position the sub-cores 111 during the installation of the rotor assembly 100, so as to prevent at least one sub-core 111 from radially moving or axially rotating during the installation of the rotor assembly 100, and ensure the position accuracy of at least one sub-core 111 and the roundness of the entire rotor assembly 100, thereby ensuring the reliability of the rotor assembly 100 after installation.

Optionally, a positioning hole 190 is provided on each sub-core 111, so that during the installation process of the rotor assembly 100, each sub-core 111 is positioned, so as to prevent each sub-core 111 from moving or rotating during the installation process, further ensure the position accuracy of each sub-core 111, further ensure the roundness of the whole rotor assembly 100, and realize reliable installation of the rotor assembly 100.

As shown in fig. 7, 8, 9, 10, 11, 12, 13, 14, and 15, in some embodiments, optionally, the at least one positioning hole 190 includes a positioning slot 191 and a balancing slot 192, wherein the balancing slot 192 communicates with the positioning slot 191, and the balancing slot 192 is located radially outward of the positioning slot 191.

In this embodiment, at least one positioning hole 190 is defined to include a positioning groove 191 and a balance groove 192, specifically, the balance groove 192 communicates with the positioning groove 191, and the balance groove 192 is located outside the positioning groove 191 in the radial direction of the rotor core 110, that is, the positioning hole 190 is composed of the positioning groove 191 and the balance groove 192. It will be appreciated that the detents 191 are used to locate the sub-cores 111 during installation of the rotor assembly 100. Thus, radial movement or axial rotation of the sub-cores 111 during the installation of the rotor assembly 100 can be prevented, the positional accuracy of the sub-cores 111 and the roundness of the entire rotor assembly 100 can be ensured, and the reliability of the rotor assembly 100 after installation can be further ensured.

The balancing slots 192 are used to mount dynamic balance round rivets, and it is understood that during the process of mounting the rotor assembly 100, the unbalance amount of the rotor assembly 100 needs to be adjusted, i.e., the dynamic balance round rivets are mounted in at least one of the balancing slots 192 according to the actual unbalance amount.

Further, by forming the positioning hole 190 from the positioning groove 191 and the balance groove 192, the structure of the sub-core 111 can be simplified.

As shown in fig. 7, 8, 9, 10, 11, 12, 13, 14, and 15, in some embodiments, the cross-sectional shape of detent 191 optionally includes at least a partial circle, at least a partial triangle, at least a partial sector, or at least a partial rectangle; and/or the cross-sectional shape of the balance groove 192 includes at least a partial circle.

In this embodiment, the shapes of the positioning groove 191 and the balance groove 192 are defined.

Specifically, the cross-sectional shape of the positioning groove 191 is at least a part of a circle, or at least a part of a triangle, or at least a part of a sector, or at least a part of a rectangle.

The balance groove 192 has a cross-sectional shape that is at least a portion of operation.

That is, a part of the circle is combined with a part of the circle, a part of the triangle, a part of the sector, or a part of the rectangle to form the positioning hole 190 of a non-pure circle, so that the unbalance amount of the rotor assembly 100 can be adjusted during the installation of the rotor assembly 100, and the sub-iron cores 111 can not be radially moved or axially rotated, thereby improving the installation efficiency.

In some embodiments, optionally, at least one permanent magnet 130 is a cuboid.

In this embodiment, at least one permanent magnet 130 is defined as a rectangular parallelepiped, that is, the structure of the permanent magnet 130 is not specially configured, and compared with the related art in which the rotor core and the magnetic steel are designed to be tapered in the radial direction and the inner and outer sides to achieve the demagnetizing bridge structure and solve the problem of magnetic steel limit, the manufacturing cost of the rotor assembly 100 can be reduced while the electromagnetic performance is fully exerted.

In some embodiments, optionally, the two end surfaces of at least one sub-core 111 are symmetrical in the axial direction of the rotor core 110.

In this embodiment, along the axial direction of the rotor core 110, two end faces of at least one sub-core 111 are symmetrically arranged, so that when the rotor assembly 100 is installed, the front and back directions of at least one sub-core 111 do not need to be distinguished, and thus the front and back identification requirements of manual and automatic equipment can be reduced, the error risk and the front and back identification cost are reduced, the installation difficulty is reduced, the installation efficiency is improved, and the production cost of the rotor assembly 100 is further reduced.

Optionally, the plurality of sub-cores 111 have the same structure, that is, any two sub-cores 111 are symmetrically arranged, so that the difficulty in mounting the rotor assembly 100 can be further reduced, the efficiency in mounting the rotor assembly 100 can be improved, and the production cost of the rotor assembly 100 can be further reduced.

According to a second aspect of the present utility model, there is provided an electric machine comprising a rotor assembly 100 according to any of the above embodiments, thereby providing all the advantageous technical effects of the rotor assembly 100, which are not described in detail herein. Further, the motor further includes a stator provided outside the rotor assembly 100.

The motor provided by the embodiment of the utility model comprises a stator and a rotor assembly 100, in particular, the stator is arranged on the outer side of the rotor assembly 100, that is, the motor is an inner rotor motor.

Specifically, the rotor assembly 100 includes a rotating shaft 180, a rotor core 110, a plurality of permanent magnets 130, and a plastic package 140, specifically, the rotor core 110 includes a plurality of sub-cores 111, the plurality of sub-cores 111 are arranged at intervals along a circumferential direction of the rotating shaft 180, and a mounting groove 120 is formed between two adjacent sub-cores 111, and each permanent magnet 130 is disposed in one mounting groove 120.

According to a third aspect of the present utility model, there is provided a household appliance comprising the rotor assembly 100 as provided in the first aspect or the motor as provided in the second aspect, thereby providing all the advantages of the rotor assembly 100 or the motor, and not described herein.

In the description of the present specification, the terms "connected," "mounted," "secured," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, 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 utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. 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 is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A rotor assembly, comprising:

a rotating shaft;

the rotor iron core comprises a plurality of sub-iron cores, the sub-iron cores are distributed along the circumferential direction of the rotating shaft, and a mounting groove is formed between two adjacent sub-iron cores;

The permanent magnets are arranged in one mounting groove;

the plastic package piece is integrally formed by injection molding and is used for connecting the rotating shaft, the rotor iron core and the permanent magnets;

the plastic package piece comprises a first limiting part and a second limiting part, wherein the first limiting part is arranged on the radial inner side of the permanent magnet, and the second limiting part is arranged on the radial outer side of the permanent magnet.

2. The rotor assembly of claim 1 wherein the rotor assembly comprises a plurality of rotor blades,

the first limiting part is provided with a first limiting groove, and a notch of the first limiting groove extends to the outer wall of the first limiting part along the radial direction of the rotor core; and/or

The second limiting part is provided with a second limiting groove, and the notch of the second limiting groove extends to the outer wall of the second limiting part along the radial direction of the rotor core.

3. The rotor assembly of claim 1 wherein the plastic package further comprises:

the first end plate and the second end plate are located on two sides of the rotor core along the axial direction of the rotor core, and are connected with the first limiting portion and the second limiting portion.

4. A rotor assembly as claimed in claim 3, wherein,

at least one of the sub-iron cores is provided with a connecting port;

the plastic package further includes:

and the connecting part is filled in the connecting port and is connected with the first end plate and the second end plate.

5. The rotor assembly of any one of claim 1 to 4, wherein,

at least one of the sub-cores includes at least one first die and a plurality of second dies stacked in an axial direction;

the first punching sheet is provided with a first magnetic bridge, and the first magnetic bridge is positioned on the radial inner side of the permanent magnet; and/or the first punching sheet is provided with a second magnetic bridge, and the second magnetic bridge is positioned on the radial outer side of the permanent magnet.

6. The rotor assembly of claim 5 wherein the rotor assembly comprises a plurality of rotor blades,

the number of the first punching sheets is multiple, and the first punching sheets are distributed at intervals;

the first punching sheet is positioned on one side of the plurality of second punching sheets; and/or

The first punching sheet is positioned between two adjacent second punching sheets.

7. The rotor assembly of any one of claims 1 to 4, wherein the plastic package further comprises:

the installation part is located the pivot with between the first spacing portion, the pivot is located in the hole of installation part, the installation part with first spacing portion connects.

8. The rotor assembly of claim 7 wherein the mounting portion comprises:

the rotating shaft is positioned in an inner hole of the mounting body;

the reinforcing ribs are arranged on one side, deviating from the rotating shaft, of the mounting body, are distributed along the circumferential direction of the rotating shaft at intervals, and are connected with the first limiting part.

9. The rotor assembly of any one of claim 1 to 4, wherein,

the outer wall of the rotating shaft is provided with a concave-convex structure.

10. The rotor assembly of any one of claim 1 to 4, wherein,

and at least one of the sub-iron cores is also provided with a positioning hole, and the positioning hole is exposed out of the plastic package piece.

11. The rotor assembly of claim 10 wherein at least one of the locating holes comprises:

a positioning groove;

and the balance groove is communicated with the positioning groove and is positioned at the radial outer side of the positioning groove.

12. The rotor assembly of claim 11 wherein the rotor assembly comprises a plurality of rotor blades,

the cross-sectional shape of the positioning groove comprises at least a partial circular shape, at least a partial triangle shape, at least a partial fan shape or at least a partial rectangle shape; and/or

The cross-sectional shape of the balancing groove includes at least a partial circle.

13. An electric machine comprising a rotor assembly as claimed in any one of claims 1 to 12.

14. A household appliance, comprising:

a rotor assembly as claimed in any one of claims 1 to 12; or (b)

The electric machine of claim 13.