CN221042436U

CN221042436U - Rotor assembly, motor and electrical equipment

Info

Publication number: CN221042436U
Application number: CN202322831803.9U
Authority: CN
Inventors: 慕文伟; 罗培源; 钱成; 郑礼成; 覃明
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2023-10-20
Filing date: 2023-10-20
Publication date: 2024-05-28
Anticipated expiration: 2033-10-20

Abstract

The utility model discloses a rotor assembly, a motor and electrical equipment. The rotor assembly comprises a rotor core, a rotating shaft, a permanent magnet and a vibration reduction body; the rotor core is provided with a rotating shaft hole and a magnet groove; the rotating shaft gap is penetrated through the rotating shaft hole; the permanent magnet is arranged in the magnet groove; the vibration reduction body is filled between the rotating shaft and the rotor core and between the rotor core and the permanent magnet; the vibration damping body covers a part of the end face of the rotor core and a part of the end face of the permanent magnet. According to the technical scheme, under the condition of less influence on the vibration reduction effect, the material of the vibration reduction body is reduced, the weight of the rotor assembly is reduced, and therefore the rotation inertia can be reduced, and the energy of the motor is improved.

Description

Rotor assembly, motor and electrical equipment

Technical Field

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

Background

As the power density of the motor increases, the energy density of the motor increases, and the motor magnetic field tends to be deeply saturated, resulting in increased electromagnetic noise.

In order to reduce electromagnetic vibration and noise caused by torque fluctuation in the running process of the motor, a vibration damping piece is generally filled in gaps among all parts in the rotor assembly to absorb electromagnetic waves, so that the noise of the motor is greatly reduced and vibration damping is realized. However, the vibration damping piece in the related art not only fills the gap between the rotor core and the rotating shaft and the gap between the rotor core and the magnet, but also completely wraps the two axial end faces of the rotor core, so that the problem that the rotor assembly is overlarge in weight and the motor energy is greatly affected by the rotation inertia is solved.

Disclosure of utility model

The utility model mainly aims to provide a rotor assembly, which aims to reduce the weight of the rotor assembly and reduce the rotation inertia so as to improve the energy of a motor on the premise of not influencing the vibration reduction and noise reduction effects.

To achieve the above object, the present utility model provides a rotor assembly comprising:

The rotor iron core is provided with a rotating shaft hole and a magnet groove;

the rotating shaft is penetrated through the rotating shaft hole in a clearance way;

The permanent magnet is arranged in the magnet groove; and

The vibration reduction body is filled between the rotating shaft and the rotor core and between the rotor core and the permanent magnet; the vibration damping body covers a part of the end face of the rotor core and a part of the end face of the permanent magnet.

In an embodiment of the application, the rotor assembly further comprises a connecting piece fixedly sleeved at least at one end of the rotating shaft, and a gap exists between the connecting piece and the end face of the rotor core; the vibration reduction body is filled between the connecting piece and the rotor core.

In one embodiment of the present application, the vibration damping body includes:

Two end face vibration reduction parts which are respectively arranged at two ends of the rotor core and cover part of the end faces of the rotor core and part of the end faces of the permanent magnets; wherein the end face vibration reduction part corresponding to the connecting piece wraps the connecting piece; and

And the middle vibration reduction part is connected with the two end surface vibration reduction parts and is filled between the rotating shaft and the rotor iron core and between the rotor iron core and the permanent magnet.

In an embodiment of the present application, a maximum outer diameter dimension of the connecting member is defined as L1, an outer diameter dimension of an end face of the rotor core is defined as L2, and an outer diameter dimension of the end face vibration reduction portion connected to the connecting member is defined as L3, so as to satisfy L1< L3< L2.

In an embodiment of the present application, the rotor core is further provided with a plurality of axial through holes distributed at intervals in a circumferential direction, and the axial through holes are located radially outside the end face vibration reduction portion in an end face projection of the rotor core.

In one embodiment of the application, the minimum clearance between the connecting piece and the rotor core in the axial direction is H, and H is more than or equal to 0.5mm.

In one embodiment of the application, at least 1 conical groove is arranged in the circumferential direction of the connecting piece, and the conical groove is arranged in a tapered manner outwards along the radial direction of the connecting piece;

Wherein the angle of the conical groove is a, and a is more than or equal to 5 degrees.

In an embodiment of the present application, the connecting piece includes a plurality of punching sheets, and the plurality of punching sheets are stacked along an axial direction of the rotating shaft.

In an embodiment of the present application, a plurality of grooves extending along an axial direction are provided on an inner wall of the rotating shaft hole, the plurality of grooves are distributed at intervals along a circumferential direction of the rotating shaft hole, and the grooves are filled with the vibration damping body.

In an embodiment of the present application, the rotor core is formed by stacking a plurality of rotor punching sheets along the axial direction of the rotating shaft;

The rotor punching sheets comprise a first half-bridge punching sheet and a second half-bridge punching sheet, wherein the outer magnetic bridge of the first half-bridge punching sheet is completely disconnected, and the inner magnetic bridge is completely connected; the outer magnetic bridge of the second half-bridge punching sheet is completely disconnected, and the inner magnetic bridge is disconnected at intervals in the circumferential direction;

The rotor core comprises a rotor core body and is characterized in that at least 1 first half-bridge punching sheet is arranged at the end part of the rotor core body, the rotor core body is axially provided with first half-bridge punching sheets and second half-bridge punching sheets which are alternately arranged, and inner magnetic bridges of two adjacent second half-bridge punching sheets are alternately arranged.

In one embodiment of the present application, the vibration damping body is a thermosetting elastomer or a thermoplastic elastomer.

In order to achieve the above purpose, the application also provides an electric machine, which comprises a stator assembly and a rotor assembly matched with the stator assembly, wherein the rotor assembly is the rotor assembly. The rotor assembly includes:

The rotor iron core is provided with a rotating shaft hole and a magnet groove;

The permanent magnet is arranged in the magnet groove; and

The vibration reduction body is filled between the rotating shaft and the rotor core and between the rotor core and the permanent magnet; the vibration damping body covers part of the end surfaces of the rotor core and the permanent magnet.

In order to achieve the above purpose, the application also provides an electrical device comprising the motor.

According to the technical scheme of the rotor assembly, the rotating shaft gap is penetrated in the rotating shaft hole of the rotor core, the permanent magnets are arranged in the magnet grooves of the rotor core, and the functions of effectively reducing vibration and noise of the rotor assembly can be realized by filling the vibration damper between the rotating shaft and the rotor core and filling the vibration damper between the rotor core and the permanent magnets. Through covering the vibration damping body with the partial terminal surface of rotor core and the partial terminal surface of permanent magnet, can play the effect to rotor core and permanent magnet axial spacing, and compare in the terminal surface that covers rotor core and permanent magnet entirely, can reduce the material of vibration damping body under the less circumstances of influence to vibration damping effect, reduce the weight of rotor subassembly to can reduce the rotation inertia, promote the energy efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an exploded view of an embodiment of a rotor assembly according to the present utility model;

FIG. 2 is an axial cross-sectional view of an embodiment of a rotor assembly according to the present disclosure;

FIG. 3 is a radial cross-sectional view of an embodiment of a rotor assembly according to the present disclosure;

Fig. 4 is a schematic structural view of a rotor core according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a first half-bridge punch according to an embodiment of the present utility model;

FIG. 6 is a schematic structural view of a second half-bridge punch according to an embodiment of the present utility model;

FIG. 7 is a schematic view of a connector according to an embodiment of the present utility model;

Fig. 8 is an axial view of a connector in an embodiment of the utility model.

Reference numerals illustrate:

Reference numerals	Name of the name	Reference numerals	Name of the name
				100	Rotor core	200	Rotating shaft
101	Rotating shaft hole	300	Permanent magnet
				101a	Groove	400	Vibration damping body
102	Magnet slot	410	End face vibration damping part
				103	Axial through hole	420	Intermediate vibration damping part
110	First half connecting bridge punching sheet	500	Connecting piece
				120	Second half-bridge punching sheet	501	Cone-shaped groove
104	External magnetic bridge	510	Matrix body
				105	Inner magnetic bridge	520	Boss

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

Meanwhile, the meaning of "and/or" and/or "appearing throughout the text is to include three schemes, taking" a and/or B "as an example, including a scheme, or B scheme, or a scheme that a and B satisfy simultaneously.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a rotor assembly, which aims to simplify the structure of a vibration reduction body, reduce the weight of the rotor assembly and reduce the rotation inertia so as to improve the energy of a motor on the premise of not influencing vibration reduction and noise reduction effects.

In the embodiment of the present utility model, as shown in fig. 1 to 3, the rotor assembly includes a rotor core 100, a rotating shaft 200, a permanent magnet 300, and a vibration damping body 400.

The rotor core 100 is provided with a rotation shaft hole 101 and a magnet slot 102; the rotating shaft 200 is penetrated through the rotating shaft hole 101 in a clearance way; the permanent magnet 300 is arranged in the magnet slot 102; the vibration damping body 400 is filled between the rotating shaft 200 and the rotor core 100, and between the rotor core 100 and the permanent magnet 300; the vibration damping body 400 covers a part of the end face of the rotor core 100 and a part of the end face of the permanent magnet 300.

It can be understood that the rotation shaft hole 101 is provided at a substantially central position of the rotor core 100 and penetrates the rotor core 100 in the axial direction of the rotor core 100, and the rotation shaft 200 is installed in the rotation shaft hole 101 with a gap between the rotation shaft 200 and the rotor core 100. The plurality of magnet slots 102 are provided, the plurality of magnet slots 102 are arranged at intervals along the circumference Xiang Junyun of the rotor core 100, and the plurality of permanent magnets 300 are correspondingly installed in the plurality of magnet slots 102.

In the rotor assembly, the vibration damper 400 is filled in the gap between the rotating shaft 200 and the rotor core 100, and the vibration damper 400 is filled in the gap between the rotor core 100 and the permanent magnet 300, so that electromagnetic waves can be absorbed, vibration between two matched components can be buffered, and vibration and noise in the running process of the motor can be effectively reduced. On the other hand, the vibration damping body 400 located on both end surfaces of the rotor core 100 does not contribute much to vibration damping and noise reduction, and increases the weight and rotational inertia of the rotor assembly, and therefore, according to the present embodiment, by providing the vibration damping body 400 so as to cover only a part of the end surfaces of the rotor core 100 and a part of the end surfaces of the permanent magnets 300, the material of the vibration damping body 400 can be reduced and the weight of the rotor assembly can be reduced with less influence on the vibration damping effect than by completely covering the end surfaces of the rotor core 100 and the permanent magnets 300.

It should be noted that, the vibration damping body 400 not only can play a role in damping between the rotor core 100 and the rotating shaft 200, and between the rotor core 100 and the permanent magnet 300, but also can play a role in connecting and limiting the rotor core 100 and the rotating shaft 200, and between the rotor core 100 and the permanent magnet 300. In this embodiment, the vibration damping body 400 covers part of the end face of the rotor core 100 and part of the end face of the permanent magnet 300, so that the vibration damping body 400 can play a role in limiting the axial direction of the rotor core 100 and the permanent magnet 300, and meanwhile, compared with the scheme of fully wrapping the end faces of the rotor core 100 and the permanent magnet 300, the material consumption of the vibration damping body 400 can be reduced, and the weight of the rotor assembly is reduced.

In practice, the vibration damping body 400 may be made of a thermosetting elastomer or a thermoplastic elastomer material. The thermosetting elastomer or the thermoplastic elastomer material can greatly absorb the vibration energy of the rotor assembly, so that a good vibration reduction effect is obtained. In addition, the materials have the characteristics of easy processing, tight and reliable connection and the like. As an example, the vibration damping body 400 may be manufactured through a casting or injection molding process.

In the rotor assembly according to the technical scheme of the utility model, the rotating shaft 200 is arranged in the rotating shaft hole 101 of the rotor core 100 in a penetrating way, the permanent magnet 300 is arranged in the magnet groove 102 of the rotor core 100, and the functions of effectively damping vibration and reducing noise of the rotor assembly can be realized by filling the vibration damping body 400 between the rotating shaft 200 and the rotor core 100 and filling the vibration damping body 400 between the rotor core 100 and the permanent magnet 300. Through covering the vibration damping body 400 with the partial end face of the rotor core 100 and the partial end face of the permanent magnet 300, the axial limiting effect on the rotor core 100 and the permanent magnet 300 can be achieved, and compared with the situation that the end faces of the rotor core 100 and the permanent magnet 300 are fully covered, the material of the vibration damping body 400 can be reduced, the weight of a rotor assembly can be reduced, the rotation inertia can be reduced, and the motor energy efficiency can be improved.

In an embodiment of the present application, referring to fig. 1, 2 and 7, the rotor assembly further includes a connecting member 500 fixedly sleeved at least at one end of the rotating shaft 200, and a gap exists between the connecting member 500 and an end surface of the rotor core 100; the vibration damping body 400 is filled between the connection member 500 and the rotor core 100.

In this embodiment, the connecting piece 500 is disposed at least one end of the rotating shaft 200, the connecting piece 500 is sleeved on the rotating shaft 200, and the vibration damping body 400 is filled between the connecting piece 500 and the end surface of the rotor core 100, so that the rotor core 100, the vibration damping body 400, the connecting piece 500 and the rotating shaft 200 can be reliably connected, and thus, the transmission function between the rotor core 100 and the rotating shaft 200 can be realized, and the rotating shaft 200 can be smoothly driven to rotate.

In practical application, the connecting piece 500 may be disposed at one end of the rotating shaft 200, or the connecting pieces 500 may be disposed at two ends of the rotating shaft 200, and the specific manner of disposition may be determined according to practical situations, which is not limited herein.

As an example, the connection member 500 may be interference-fixed with the rotation shaft 200.

In an embodiment of the present application, referring to fig. 1, 2 and 7, an outer diameter of the connecting member 500 is smaller than an outer diameter of the rotor core 100, and the vibration damping body 400 wraps the connecting member 500.

In this embodiment, the outer diameter of the connecting member 500 is smaller than that of the rotor core 100, so that the volume of the rotor assembly can be reduced, the connecting member 500 can be wrapped by the vibration damping body 400, the connection reliability among the rotor core 100, the connecting member 500 and the rotating shaft 200 can be increased, and the reliability of torque transmission can be improved.

Further, referring to fig. 1 and 2, the vibration damping body 400 includes two end surface vibration damping portions 410 and an intermediate vibration damping portion 420, and the two end surface vibration damping portions 410 are respectively disposed at two ends of the rotor core 100 and cover a part of the end surface of the rotor core 100 and a part of the end surface of the permanent magnet 300; wherein the end surface vibration reduction part 410 corresponding to the connection member 500 wraps the connection member 500; the intermediate damper portion 420 connects the two end-face damper portions 410, and is filled between the rotary shaft 200 and the rotor core 100, and between the rotor core 100 and the permanent magnet 300.

In this embodiment, the structure of the vibration damping body 400 is illustrated, and two end-face vibration damping portions 410 are respectively connected to two end faces of the rotor core 100 and the permanent magnet 300 to axially limit and fix the permanent magnet 300 and the rotor core 100. Meanwhile, the end surface vibration reduction part 410 wraps the corresponding connecting piece 500, and fills gaps between the connecting piece 500 and the end surfaces of the rotor core 100 and the permanent magnet 300, so that the axial and radial limiting and fixing functions of the connecting piece 500 and the rotor core 100, the permanent magnet 300 and the rotating shaft 200 are realized, electromagnetic torque can be transmitted, and vibration noise of the rotor assembly in the axial direction is reduced. The intermediate vibration reduction part 420 is filled between the rotor core 100 and the rotation shaft 200, and can reduce vibration noise of the rotor assembly in the radial direction. The intermediate vibration reduction part 420 is filled between the rotor core 100 and the permanent magnet 300, and can fix the permanent magnet 300 in the magnet slot 102 of the rotor core 100.

In an embodiment of the present application, a maximum outer diameter dimension of the connection member 500 is defined as L1, an outer diameter dimension of the end face of the rotor core 100 is defined as L2, and an outer diameter dimension of the end face vibration reduction portion 410 connected to the connection member 500 is defined as L3, satisfying L1< L3< L2.

In the present embodiment, by setting the outer diameter dimension L3 of the end-face vibration reduction portion 410 to be larger than the outer diameter dimension L1 of the connector 500 and smaller than the outer diameter dimension L2 of the end face of the rotor core 100, the end-face vibration reduction portion 410 can wrap the connector 500 to achieve connection reliability while also reducing the material consumption of the end-face vibration reduction portion 410, so that the rotor assembly is light-weighted.

Further, referring to fig. 2 to 6, the rotor core 100 is further provided with a plurality of axial through holes 103 distributed at intervals in the circumferential direction, and the axial through holes 103 are located radially outside the end face damper portion 410 in the end face projection of the rotor core 100.

It can be appreciated that the axial through-hole 103 in the rotor core 100 can serve to reduce the weight of the rotor core 100 and dissipate heat. In this embodiment, on the end projection of the rotor core 100, the axial through hole 103 is located radially outside the end vibration damping portion 410, so that the end vibration damping portion 410 does not cover the axial through hole 103, that is, the vibration damping body 400 is not filled in the axial through hole 103, and the weight of the rotor assembly can be further reduced compared to the case where the vibration damping body 400 is filled in the axial through hole 103 in the related art.

In practical application, during the process stage of injection molding the vibration damping body 400, the two ends of the axial through hole 103 can be blocked by using the mold, so that the situation that the vibration damping body 400 flows into the axial through hole 103 can not occur, the rotor assembly is lighter, and the motor energy efficiency is higher.

In some other embodiments, taking an end where the connecting piece 500 is not provided as an example, the outer diameter of the end face vibration reduction portion 410 of the end may be no greater than the outer diameter of the connecting piece 500, which only needs to partially cover the end faces of the rotor core 100 and the permanent magnet 300, so as to ensure the axial limiting function of the rotor core 100 and the permanent magnet 300. Alternatively, the end face damper portion 410 of the end may cover 1/5 of the radial dimension of the permanent magnet 300, so that the arrangement can further reduce the weight of the rotor assembly while ensuring the structural connection reliability.

In an embodiment of the present application, referring to fig. 1 and 2, a minimum gap between the connecting member 500 and the rotor core 100 in the axial direction is H, which satisfies H being greater than or equal to 0.5mm.

As can be seen from the foregoing embodiments, the vibration damping body 400 is also filled between the connection member 500 and the end face of the rotor core 100, and the vibration damping body 400 is used to form a connection structure between the connection member 500 and the rotor core 100. In the present embodiment, by limiting the minimum gap H between the connection member 500 and the rotor core 100 in the axial direction to not less than 0.5mm, a sufficiently thick vibration damping body 400 can be connected between the connection member 500 and the end face of the rotor core 100, and connection reliability and stability, and a better vibration damping effect can be improved.

In addition, a sufficient gap between the connecting member 500 and the end surface of the rotor core 100 can also ensure that the vibration damping material can more easily enter the gap between the rotor core 100 and the rotating shaft 200 when the vibration damping body 400 is formed, and a better vibration damping effect can also be achieved, thereby reducing vibration noise.

In practical applications, the shape and structure of the connecting member 500 may be determined according to practical situations, for example, a plate structure, a block structure, a cylindrical structure, or other structures. In this embodiment, considering the structural strength of the connection member 500, the strength of transmitting torque, and the like, the connection member 500 includes, as an example, a base 510 and a boss 520, the boss 520 is protruded at a side of the base 510 facing an end surface of the rotor core 100, and the rotation shaft 200 penetrates the boss 520 and the base 510. Wherein, the minimum distance between the boss 520 and the end face of the rotor core 100 is not less than 0.5mm. In practical application, the boss 520 and the base 510 are integrally formed.

In practical application, the forming manner of the connecting piece 500 may be determined according to practical situations, for example, a plurality of stamping sheets are stacked, or the connecting piece is formed by stamping metal plates, or is formed by metal powder metallurgy, or is formed by casting, combining machining and other processes. In this embodiment, the connecting member 500 is formed by stacking a plurality of punching sheets along the axial direction of the rotating shaft 200, by way of example, in consideration of cost, process simplicity, and the like.

Further, referring to fig. 7 and 8, at least 1 tapered groove 501 is provided in the circumferential direction of the connection member 500, and the tapered groove 501 is tapered outwardly in the radial direction of the connection member 500; wherein the angle of the conical groove 501 is a, satisfying a is not less than 5 °.

In this embodiment, the tapered groove 501 is provided for guiding the assembly, preventing slipping, and improving the reliability of connection. At the same time, the vibration reduction body 400 can be filled into the corresponding conical groove 501, so that the torque bearing capacity of the rotor assembly can be improved.

By setting the taper angle a of the taper groove 501 to be not less than 5 ° and the taper groove 501 is tapered outward in the radial direction of the connection member 500, the coupling force between the vibration damping body 400 and the connection member 500 can be improved, and particularly in a low temperature environment, the vibration damping body 400 can be effectively prevented from being separated from the connection member 500 due to a relatively greater low temperature shrinkage rate, so that the reliability of the rotor assembly can be improved.

In an embodiment of the present application, referring to fig. 3 to 6, a plurality of axially extending grooves 101a are formed on the inner wall of the shaft hole 101, the plurality of grooves 101a are distributed at intervals along the circumferential direction of the shaft hole 101, and the grooves 101a are filled with the vibration damping body 400.

The grooves 101a in the present embodiment can increase the mechanical engagement force of the vibration damping body 400 and the rotor core 100, prevent the vibration damping body 400 and the rotor core 100 from slipping relative to each other in the circumferential direction, and thus can further improve the reliability of torque transmission between the rotor core 100 and the rotating shaft 200.

In an embodiment of the present application, referring to fig. 4 to 6, a rotor core 100 is formed by stacking a plurality of rotor sheets along an axial direction of a rotating shaft 200; the plurality of rotor laminations include a first half-bridge lamination 110 and a second half-bridge lamination 120, the outer magnetic bridges 104 of the first half-bridge lamination 110 being fully disconnected and the inner magnetic bridges 105 being fully connected; the outer magnetic bridge 104 of the second half-bridge lamination 120 is completely disconnected, and the inner magnetic bridge 105 is disconnected at intervals in the circumferential direction; at least 1 first half-bridge lamination 110 is disposed at an end of the rotor core 100, and the first half-bridge lamination 110 and the second half-bridge lamination 120 are alternately disposed in an axial direction of the rotor core 100, wherein inner magnetic bridges 105 of two adjacent second half-bridge lamination 120 are alternately disposed.

In this embodiment, the first half-bridge stamping sheets 110 are disposed at two ends of the rotor core 100, which is not only beneficial to mold sealing in injection molding process, but also capable of improving rigidity and strength of the rotor core 100, and preventing burrs and flash of molded products caused by exudation of injection molding liquid.

Through the alternate arrangement of the first half-bridge lamination 110 and the second half-bridge lamination 120, and the alternate arrangement of the inner magnetic bridges 105 of the two adjacent second half-bridge lamination 120, it can be understood that the two adjacent second half-bridge lamination 120 rotate by one magnetic pole along the circumferential direction of the rotor core 100, so that the inner magnetic bridges 105 of the rotor core 100 form an alternate connection and disconnection structure in the axial direction, thereby improving the electromagnetic performance of the motor and reducing the energy consumption.

In an embodiment of the present application, referring to fig. 2, the axial length of the rotor core 100 is smaller than that of the permanent magnet 300.

It can be appreciated that the axial stacking thickness of each lamination of the rotor core 100 is smaller than the axial length of the permanent magnet 300, and this structure not only can improve the electromagnetic performance of the motor and reduce the energy consumption, but also can enable the vibration damper 400 in the rotor assembly to have the capability of bearing larger torque.

Based on the rotor assembly in the present description, as an example, the following manufacturing steps may be adopted:

A first step of manufacturing a rotor core 100, a permanent magnet 300, a connection member 500, and a rotation shaft 200, respectively;

A second step of fixedly mounting one of the connection members 500 and the rotation shaft 200 as one assembly;

A third step of sleeving the rotor core 100 on the rotation shaft 200 through the rotation shaft hole 101 of the rotor core 100;

A fourth step of fixedly mounting another connection member 500 to the rotation shaft 200 (this step is applicable to the case where the connection member 500 is provided at both ends of the rotor core 100, and if not, the step is omitted);

Fifthly, putting the rotor core 100, the connecting piece 500 and the rotating shaft 200 assembly assembled in the front into an injection mold together for positioning, and inserting the permanent magnet 300;

And sixth, the rotor core 100, the permanent magnet 300, the connecting piece 500 and the rotating shaft 200 are formed into an integral plastic-coated structure by using rubber or thermoplastic elastomer materials through an injection molding process, wherein the structure formed by the rubber or thermoplastic elastomer materials is the vibration damper 400.

The utility model also provides a motor, which comprises a stator component and a rotor component, wherein the specific structure of the rotor component refers to the embodiment, and as the motor adopts all the technical schemes of all the embodiments, the motor at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.

The utility model also provides an electrical device, which comprises a motor, wherein the specific structure of the motor refers to the embodiment, and because the electrical device adopts all the technical schemes of all the embodiments, the electrical device at least has all the beneficial effects brought by the technical schemes of the embodiments, and the details are not repeated here. Alternatively, the electrical device may be a refrigerator, a washing machine, an air conditioner, or the like.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. A rotor assembly, comprising:

The rotor iron core is provided with a rotating shaft hole and a magnet groove;

The permanent magnet is arranged in the magnet groove; and

2. The rotor assembly of claim 1 further comprising a connector fixedly sleeved at least at one end of the shaft, a gap being present between the connector and an end face of the rotor core; the vibration reduction body is filled between the connecting piece and the rotor core.

3. The rotor assembly of claim 2 wherein the vibration dampening body comprises:

4. A rotor assembly as claimed in claim 3, wherein a maximum outer diameter dimension of the connection member is defined as L1, an outer diameter dimension of the end face of the rotor core is defined as L2, and an outer diameter dimension of the end face vibration reduction portion connected to the connection member is defined as L3, satisfying L1< L3< L2.

5. The rotor assembly of claim 4 wherein the rotor core is further provided with a plurality of axial through holes circumferentially spaced apart, the axial through holes being located radially outward of the end face vibration reduction portion in an end face projection of the rotor core.

6. A rotor assembly as claimed in any one of claims 2 to 5 wherein the minimum clearance between the connector and the rotor core in the axial direction is H, satisfying H ≡0.5mm.

7. A rotor assembly as claimed in any one of claims 2 to 5, wherein the connector is circumferentially provided with at least 1 tapered slot tapering radially outwardly of the connector;

8. A rotor assembly as claimed in any one of claims 2 to 5, wherein the connector is provided by a plurality of laminations in axial overlap relation with the shaft.

9. A rotor assembly as claimed in any one of claims 1 to 5 wherein the bore inner wall of the spindle bore is provided with a plurality of axially extending grooves, a plurality of said grooves being circumferentially spaced about the spindle bore, said grooves being filled with said vibration damping body.

10. A rotor assembly as claimed in any one of claims 1 to 5, wherein the rotor core is provided by a plurality of rotor laminations in axial lamination along the shaft;

11. A rotor assembly as claimed in any one of claims 1 to 5 wherein the vibration damping body is a thermoset elastomer or a thermoplastic elastomer.

12. An electric machine comprising a stator assembly and a rotor assembly cooperating with the stator assembly, the rotor assembly being as claimed in any one of claims 1 to 11.

13. An electrical device comprising the motor of claim 12.