CN115882635A - Rotor subassembly, motor and electrical equipment - Google Patents

Abstract

The invention provides a rotor assembly, a motor and electrical equipment, wherein the rotor assembly comprises: an inner rotor core; the outer rotor cores are arranged at intervals along the circumferential direction of the inner rotor core; the permanent magnets are arranged between two adjacent outer rotor iron cores; the first injection molding magnet is arranged between the inner rotor iron core and the outer rotor iron cores and connected with the inner rotor iron core and the outer rotor iron cores through the first injection molding magnet.

Description

Rotor subassembly, motor and electrical equipment

Technical Field

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

Background

In the correlation technique, be provided with the magnetic bridge between the adjacent iron core of rotor subassembly to realize the wholeness and the mechanical strength of rotor core structure, however, the setting of magnetic bridge can increase the magnetic leakage in rotor permanent magnet or stator winding's armature magnetic field, thereby leads to the performance of motor to receive the influence.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art.

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

A second aspect of the invention provides an electric machine.

A third aspect of the invention provides an electrical appliance.

A first aspect of the invention provides a rotor assembly comprising: an inner rotor core; the outer rotor cores are arranged at intervals along the circumferential direction of the inner rotor core; the permanent magnets are arranged between two adjacent outer rotor iron cores; the first injection molding magnet is arranged between the inner rotor iron core and the outer rotor iron cores, and the inner rotor iron core and the outer rotor iron cores are connected through the first injection molding magnet.

The rotor assembly provided by the invention comprises an inner rotor iron core and an outer rotor iron core, wherein the outer rotor iron cores can be arranged at intervals along the circumferential direction of the inner rotor iron core, and meanwhile, permanent magnets are arranged between the adjacent outer rotor iron cores, namely, the rotor assembly also comprises a plurality of permanent magnets which can be arranged between the adjacent outer rotor iron cores and can provide magnetic fields to realize interaction with windings in a stator assembly, so that the rotation of a rotor is realized, and the normal operation of a motor is also realized.

Specifically, in the operation process, a winding in a stator assembly of the motor is electrified, and a permanent magnet in a rotor assembly and the winding move relatively under the action of electromagnetic induction, so that the rotation of the rotor is realized.

Furthermore, the rotor assembly further comprises a first injection molding magnet, the first injection molding magnet is arranged between the inner rotor iron core and the outer rotor iron core, and the inner rotor iron core and the outer rotor iron core are connected through the first injection molding magnet. That is, the first magnet of moulding plastics sets up in the outside of inner rotor iron core, and is connected with the inner rotor iron core, and simultaneously, the tip of a plurality of outer rotor iron cores still is connected with the first magnet of moulding plastics to realized that it is connected inner rotor iron core and a plurality of outer rotor iron cores through the first magnet of moulding plastics, thereby at the in-process of motor operation, also be exactly rotor subassembly pivoted in-process, inner rotor iron core can rotate under outer rotor iron core's drive simultaneously, in order to realize the output of motor moment of torsion.

Specifically, the first injection molding magnet may be disposed between the inner rotor core and the outer rotor core in an injection molding manner, so as to form the first injection molding magnet connecting the inner rotor core and the outer rotor core. That is, at first can arrange the position of inner rotor iron core, outer rotor iron core well, then pack the first magnet of moulding plastics of soft state between inner rotor iron core and outer rotor iron core, wait for the first magnet shaping of moulding plastics after, can accomplish the setting of the first magnet of moulding plastics.

It can be understood that, in the related art, the inner rotor core and the outer rotor core of the rotor assembly are directly connected, and generally, the inner rotor core and the outer rotor core are integrally formed. Like this, be provided with the condition of permanent magnet between adjacent outer rotor core, the junction between outer rotor core and the inner rotor core can form the magnetic bridge, and the formation of magnetic bridge can increase the magnetic leakage of the armature magnetic field of winding in the stator module of permanent magnet and motor to influence the operating efficiency of motor. This application can realize interconnect between inner rotor core and the outer rotor core through the setting of the first magnet of moulding plastics to guarantee that inner rotor core can rotate with outer rotor core synchronous. In addition, the first injection molding magnet can replace a magnetic bridge, namely the first injection molding magnet has magnetism, so that the magnetic leakage of the permanent magnet and the armature magnetic field is offset, and the running efficiency of the motor can be further improved.

In addition, because outer rotor core and inner rotor core can be connected through the first magnet of moulding plastics, consequently, before setting up the first magnet of moulding plastics, can finish setting up the position of a plurality of outer rotor cores, inner rotor core and a plurality of permanent magnet simultaneously, then set up the first magnet of moulding plastics, be connected inner rotor core with outer rotor core. That is, after the positions of the parts of the rotor assembly are set, the parts of the rotor assembly are connected through the arrangement of the first injection molding magnet, and the permanent magnets do not need to be respectively and sequentially inserted into the magnetic grooves in the related art, so that the assembly efficiency of the rotor assembly can be effectively improved.

According to the rotor assembly provided by the invention, the first injection magnet is arranged between the inner rotor iron core and the outer rotor iron core, and the inner rotor iron core and the outer rotor iron core are connected through the first injection magnet, so that on the basis of realizing the connection of the inner rotor iron core and the outer rotor iron core, the first injection magnet is used for replacing the arrangement of a magnetic bridge in the related technology, the magnetic leakage between the inner rotor iron core and the outer rotor iron core of the permanent magnet and the armature magnetic field can be offset through the magnetism of the first injection magnet, and the running efficiency of the motor is further improved. And, through the first magnet of moulding plastics with inner rotor core and outer rotor core be connected, can set up the back with each part's of rotor subassembly position, set up the first magnet of moulding plastics, and need not to insert the permanent magnet in the magnetic slot respectively in proper order like correlation technique, can improve the assembly efficiency of rotor subassembly effectively.

In addition, according to the rotor assembly in the above technical solution provided by the present invention, the following additional technical features may also be provided:

in the above technical solution, further, the rotor assembly further includes: and the second injection molding magnets are arranged between two adjacent outer rotor iron cores and positioned at one end, far away from the inner rotor iron core, of the permanent magnet.

In the technical scheme, a second injection molding magnet can be further arranged at one end, far away from the inner rotor iron core, of the permanent magnet, namely the number of the second injection molding magnets is the same as that of the permanent magnets, and the second injection molding magnets are arranged in one-to-one correspondence with the permanent magnets.

Through the setting of the second magnet of moulding plastics, can realize replacing the magnetic bridge between two adjacent permanent magnets among the correlation technique to through the magnetism that the second magnet of moulding plastics itself has, offset the magnetic leakage in permanent magnet and armature magnetic field, thereby can further improve the operating efficiency of motor.

Furthermore, the two adjacent outer rotor cores can be connected through the second injection molding magnet, so that the connection stability between the outer rotor cores is further improved, the overall mechanical strength of the rotor assembly is also further improved, and the operation stability of the rotor assembly is improved.

Specifically, the second injection molding magnet may be disposed between two adjacent outer rotor cores in an injection molding manner. That is, the positions of the outer rotor cores can be arranged well, then the second injection molding magnet in a soft state is filled between two adjacent outer rotor cores, and after the second injection molding magnet is molded, the setting of the second injection molding magnet can be completed.

In any of the above technical solutions, further, the number of pole pairs of the permanent magnet is the same as the number of pole pairs of the first injection molded magnet and the number of pole pairs of the second injection molded magnet.

In the technical scheme, the number of pole pairs of the permanent magnet is the same as that of the first injection molding magnet and that of the second injection molding magnet. That is, in the case where the rotor assembly is provided with only the first injection-molded magnet without the second injection-molded magnet, the number of pole pairs of the permanent magnet is the same as that of the first injection-molded magnet. Under the condition that the rotor assembly is simultaneously provided with the first injection molding magnet and the second injection molding magnet, the pole pair numbers of the permanent magnet, the first injection molding magnet and the second injection molding magnet are the same. Through the permanent magnet, the first magnet of moulding plastics and the setting of the second magnet number of pole pairs of moulding plastics, can guarantee the steady operation of rotor subassembly, guarantee the operating efficiency of motor.

In any of the above technical solutions, further, the remanent magnetization of the permanent magnet is greater than the remanent magnetization of the first injection-molded magnet and the remanent magnetization of the second injection-molded magnet.

In the technical scheme, the residual magnetization intensity after the permanent magnet is magnetized is set to be larger than the residual magnetization intensity of the first injection molding magnet and the second injection molding magnet, so that the magnetic field intensity after the permanent magnet is magnetized can be ensured, the magnetic field intensity matched with the winding of the stator assembly in the running process of the rotor assembly is further ensured, and the running effect of the motor is also ensured. And the residual magnetization intensity of the first injection molding magnet and the second injection molding magnet is smaller, so that the normal operation of the motor is prevented from being influenced by the larger residual magnetic field on the basis of offsetting the magnetic leakage of the permanent magnet and the armature magnetic field, and the operation effect of the motor is ensured.

In any of the above technical solutions, further, the first injection-molded magnet includes: the main body is sleeved on the inner rotor iron core; the connecting parts are arranged along the circumferential direction of the main body, one ends of the connecting parts are connected with the main body, and the other ends of the connecting parts are connected with the end parts of the outer rotor cores in a one-to-one correspondence mode.

In this technical scheme, the first magnet of moulding plastics can be including the main part of cover locating on the inner rotor iron core and a plurality of connecting portion that are connected with the main part. It can be understood that the connecting parts are arranged on the outer side of the main body along the circumferential direction of the main body and connected with the main body, meanwhile, the number of the connecting parts is the same as that of the outer rotor cores, and the connecting parts are connected with the outer rotor cores in a one-to-one correspondence manner. That is, one end of the connecting portion is connected to the main body, and the other end of the connecting portion is connected to the end of the outer rotor core.

Through the setting of main part and a plurality of connecting portion, can guarantee the stability of being connected between first magnet of moulding plastics and the inner rotor iron core, also guarantee simultaneously that first magnet of moulding plastics can with a plurality of outer rotor iron core between interconnect to realize being connected between inner rotor iron core and the outer rotor iron core.

In any of the above technical solutions, further, first protrusions are disposed on two sides of the end portion of the outer rotor iron core close to the inner rotor iron core, and the connecting portion is wrapped on the first protrusions; and second bulges are arranged on two sides of one end, away from the inner rotor iron core, of the outer rotor iron core, and the end parts of the permanent magnets are abutted against the second bulges.

In this technical scheme, the both sides that outer rotor core is close to the tip of inner rotor core are provided with first arch, also be exactly between two adjacent outer rotor cores, and two first archs extend to between two outer rotor cores, on the one hand, can play limiting displacement to the permanent magnet through two first archs, avoid the permanent magnet to slide to interior rotor core, guarantee the position of permanent magnet. On the other hand, through first bellied setting, can wrap up the connecting portion of the first magnet of moulding plastics on first arch to further improve the first stability of being connected between magnet and the outer rotor core of moulding plastics, and then guarantee the wholeness of rotor subassembly structure.

Further, the two sides of one end, far away from the inner rotor core, of the outer rotor core are also provided with second protrusions, namely between two adjacent outer rotor cores, the two second protrusions also extend between the two outer rotor cores, and therefore the end of the permanent magnet between the two adjacent outer rotor cores can be abutted against the second protrusions, and therefore the permanent magnet can be limited. In the process of the operation of the rotor assembly, the rotation of the rotor assembly can lead the permanent magnet to generate centrifugal force, and the permanent magnet is abutted against the second protrusions, so that the centrifugal force of the permanent magnet is offset through the second protrusions, and the position of the permanent magnet is ensured.

In any of the above technical solutions, further, the permanent magnet includes a first tangential magnetization permanent magnet.

According to a second aspect of the present invention, there is provided an electric machine comprising: according to the rotor assembly of any one of the above technical solutions, the rotor assembly is disposed in the stator assembly.

The invention provides an electrical machine incorporating a rotor assembly according to the first aspect of the invention. Accordingly, the overall benefits of the above-described rotor assembly are not discussed in detail herein.

In any of the above technical solutions, the motor further includes a stator assembly, where the number of stator slots of the stator assembly is Ns, and the number of poles of the rotor assembly is P, where P = Ns ± 2 or P = Ns ± 4.

In the technical scheme, the stable operation of the motor is ensured and the operation efficiency of the motor is ensured by setting the relation between the pole number of the rotor assembly and the number of the stator slots of the stator assembly.

In any of the above technical solutions, further, the motor includes a fan motor, a permanent magnet synchronous motor, a servo motor, or a stepping motor.

According to a third aspect of the present invention, an electrical apparatus is proposed, comprising a motor according to any of the above-mentioned claims.

The electrical equipment provided by the invention comprises the motor according to the second aspect of the invention. Therefore, all the advantages of the above-mentioned motor are not discussed in detail here.

Further, the electric appliance includes an air conditioner, a refrigerator, or a washing machine.

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

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 illustrates a schematic structural view of a rotor assembly provided according to an embodiment of the present invention;

FIG. 2 illustrates a schematic structural view of a rotor assembly provided in accordance with yet another embodiment of the present invention;

FIG. 3 shows a schematic structural view of the permanent magnet, the first injection molded magnet and the second injection molded magnet of FIG. 2;

FIG. 4 is a schematic diagram showing a portion of the structure of a first injection molded magnet in the rotor assembly of FIG. 1;

FIG. 5 shows a schematic structural view of the permanent magnet and the second injection molded magnet of FIG. 2;

fig. 6 is a schematic structural view illustrating an inner rotor core and an outer rotor core of fig. 1;

FIG. 7 shows a schematic structural view of a permanent magnet, a first injection molded magnet and a second injection molded magnet in another embodiment of the present invention;

fig. 8 is a schematic view showing the structures of an inner rotor core and an outer rotor core according to another embodiment of the present invention;

fig. 9 is a schematic view illustrating a structure of a motor provided according to an embodiment of the present invention;

FIG. 10 illustrates a structural schematic of a stator assembly of the electric machine of FIG. 9;

wherein, the correspondence between the reference numbers and the part names in fig. 1 to 10 is:

100 rotor assembly, 102 rotor core, 104 outer rotor core, 106 permanent magnet, 108 first injection molded magnet, 110 main body, 112 connecting part, 114 first protrusion, 116 second protrusion, 118 second injection molded magnet, 300 motor, 302 stator assembly, 304 stator yoke part, 306 stator tooth, 308 winding.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

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

A rotor assembly, a motor, and an electric device provided according to some embodiments of the present invention are described below with reference to fig. 1 to 10.

The present invention proposes a first aspect, and as shown in fig. 1, fig. 3, fig. 4 and fig. 5, proposes a rotor assembly 100, which includes an inner rotor core 102 and a plurality of outer rotor cores 104, wherein the plurality of outer rotor cores 104 are arranged at intervals along a circumferential direction of the inner rotor core 102; rotor assembly 100 further includes a plurality of permanent magnets 106 and a first injection molded magnet 108, wherein permanent magnets 106 are disposed between two adjacent outer rotor cores 104; the first injection magnets 108 are disposed between the inner rotor core 102 and the plurality of outer rotor cores 104, and the inner rotor core 102 and the outer rotor cores 104 are connected by the first injection magnets 108.

The rotor assembly 100 provided by the invention comprises an inner rotor core 102 and an outer rotor core 104, wherein the outer rotor cores 104 can be arranged at intervals along the circumferential direction of the inner rotor core 102, and meanwhile, permanent magnets 106 are arranged between the adjacent outer rotor cores 104, that is, the rotor assembly 100 further comprises a plurality of permanent magnets 106, the permanent magnets 106 can be arranged between the adjacent outer rotor cores 104, and the permanent magnets 106 can provide magnetic fields to realize interaction with windings in a stator assembly, so that the rotation of a rotor is realized, and the normal operation of a motor is also realized.

Specifically, during operation, the windings in the stator assembly of the motor are energized, and the permanent magnets 106 in the rotor assembly 100 and the windings move relative to each other under the action of electromagnetic induction, thereby achieving rotation of the rotor.

Further, the rotor assembly 100 further includes a first injection magnet 108, the first injection magnet 108 is disposed between the inner rotor core 102 and the outer rotor core 104, and the inner rotor core 102 and the outer rotor core 104 are connected through the first injection magnet 108. That is, the first injection molding magnet 108 is disposed at the outer side of the inner rotor core 102 and connected to the inner rotor core 102, and meanwhile, the end portions of the plurality of outer rotor cores 104 are also connected to the first injection molding magnet 108, so that the inner rotor core 102 and the plurality of outer rotor cores 104 are connected through the first injection molding magnet 108, and thus, in the operation process of the motor, that is, in the rotation process of the rotor assembly 100, the inner rotor core 102 can synchronously rotate under the driving of the outer rotor core 104, so as to output the torque of the motor.

Specifically, a first injection-molded magnet may be disposed between inner rotor core 102 and outer rotor core 104 by injection molding, thereby forming a first injection-molded magnet 108 connecting inner rotor core 102 and outer rotor core 104. That is, the positions of the inner rotor core 102 and the outer rotor core 104 may be arranged, and then the first injection molding magnet in a soft state is filled between the inner rotor core 102 and the outer rotor core 104, and after the first injection molding magnet is molded, the setting of the first injection molding magnet 108 may be completed.

It can be understood that, in the related art, the inner rotor core and the outer rotor core of the rotor assembly are directly connected, and generally, the inner rotor core and the outer rotor core are integrally formed. Like this, be provided with the condition of permanent magnet between adjacent outer rotor core, the junction between outer rotor core and the inner rotor core can form the magnetic bridge, and the formation of magnetic bridge can increase the magnetic leakage of the armature magnetic field of winding in the stator module of permanent magnet and motor to influence the operating efficiency of motor. This application can realize interconnect between inner rotor core 102 and outer rotor core 104 through the setting of first magnet 108 of moulding plastics to guarantee that inner rotor core 102 can rotate with outer rotor core 104 synchronous. In addition, the first injection molding magnet 108 can replace a magnetic bridge, that is, the magnetic flux leakage of the permanent magnet and the armature magnetic field can be counteracted through the magnetism of the first injection molding magnet 108, so that the operation efficiency of the motor can be further improved.

In addition, since the outer rotor core 104 and the inner rotor core 102 may be connected by the first injection magnet 108, before the first injection magnet 108 is disposed, the positions of the plurality of outer rotor cores 104, the inner rotor core 102, and the plurality of permanent magnets 106 may be simultaneously disposed, and then the first injection magnet 108 is disposed to connect the inner rotor core 102 and the outer rotor core 104. That is, after the positions of the respective portions of the rotor assembly 100 are set, the respective portions of the rotor assembly 100 are connected by the setting of the first injection molding magnet 108 without sequentially inserting the permanent magnets into the magnetic grooves, respectively, as in the related art, and thus the assembling efficiency of the rotor assembly 100 can be effectively improved.

According to the rotor assembly 100 provided by the invention, the first injection molding magnet 108 is arranged between the inner rotor core 102 and the outer rotor core 104, and the inner rotor core 102 is connected with the outer rotor core 104 through the first injection molding magnet 108, so that on the basis of realizing the connection of the inner rotor core 102 and the outer rotor core 104, the first injection molding magnet 108 is used for replacing the arrangement of a magnetic bridge in the related technology, and further, the magnetic leakage of a permanent magnet and an armature magnetic field between the inner rotor core 102 and the outer rotor core 104 can be counteracted through the magnetism of the first injection molding magnet 108, so that the operation efficiency of a motor is improved. Moreover, the inner rotor core 102 and the outer rotor core 104 are connected by the first injection magnet 108, so that the first injection magnet 108 can be arranged after the positions of the parts of the rotor assembly 100 are arranged, and the permanent magnets do not need to be respectively and sequentially inserted into the magnetic slots as in the related art, thereby effectively improving the assembly efficiency of the rotor assembly 100.

In any of the above embodiments, further, as shown in fig. 3, 4, 5, 6, 7 and 8, the rotor assembly 100 further includes a plurality of second injection-molded magnets 118, the second injection-molded magnets 118 are disposed between two adjacent outer rotor cores 104, and the second injection-molded magnets 118 are located at an end of the permanent magnets 106 far from the inner rotor core 102.

In this embodiment, at one end of the permanent magnet 106 far from the inner rotor core 102, there may be further provided second injection-molded magnets 118, that is, the number of the second injection-molded magnets 118 is the same as that of the permanent magnets 106, and the second injection-molded magnets 118 are provided in one-to-one correspondence with the permanent magnets 106.

Through the setting of the second injection molding magnet 118, a magnetic bridge between two adjacent permanent magnets in the related art can be replaced, so that the magnetic leakage of the permanent magnets and the armature magnetic field is counteracted through the magnetism of the second injection molding magnet 118, and the running efficiency of the motor can be further improved.

Further, two adjacent outer rotor cores 104 can be connected through the second injection molding magnet 118, so that the connection stability between the outer rotor cores 104 is further improved, that is, the overall mechanical strength of the rotor assembly 100 is further improved, and the operation stability of the rotor assembly 100 is improved.

Specifically, the second injection-molded magnet may be disposed between two adjacent outer rotor cores 104 in an injection-molded manner. That is, the positions of the outer rotor cores 104 may be arranged, and then the second injection magnet in a soft state is filled between two adjacent outer rotor cores 104, and after the second injection magnet is molded, the second injection magnet 118 may be set.

In any of the above embodiments, further, as shown in fig. 2, the number of pole pairs of the permanent magnet 106 is the same as the number of pole pairs of the first injection molded magnet 108 and the number of pole pairs of the second injection molded magnet 118.

In this embodiment, the number of pole pairs of the permanent magnet 106 is the same as the number of pole pairs of the first injection molded magnet 108 and the second injection molded magnet 118. That is, in the case where the rotor assembly 100 is provided with only the first injection molded magnet 108 and no second injection molded magnet 118, the number of pole pairs of the permanent magnet 106 is the same as the number of pole pairs of the first injection molded magnet 108. In the case where the rotor assembly 100 is provided with both the first and second injection molded magnets 108, 118, the number of pole pairs of the permanent magnet 106, the first injection molded magnet 108, and the second injection molded magnet 118 are all the same. Through the arrangement of the pole pairs of the permanent magnet 106, the first injection molding magnet 108 and the second injection molding magnet 118, the stable operation of the rotor assembly 100 can be ensured, and the operation efficiency of the motor is ensured.

Further, the residual magnetization of the permanent magnet 106 is larger than the residual magnetization of the first injection-molded magnet 108 and the residual magnetization of the second injection-molded magnet 118.

Specifically, the residual magnetization intensity after the permanent magnet 106 is magnetized is set to be greater than the residual magnetization intensity of the first injection molding magnet 108 and the second injection molding magnet 118, so that the magnetic field intensity after the permanent magnet 106 is magnetized can be ensured, the magnetic field intensity matched with the winding of the stator assembly in the operation process of the rotor assembly 100 is further ensured, and the operation effect of the motor is also ensured. The residual magnetization intensity of the first injection molding magnet 108 and the second injection molding magnet 118 is small, so that the normal operation of the motor can be prevented from being influenced by large magnetic field residual on the basis of offsetting the magnetic leakage of the permanent magnet 106 and the armature magnetic field, and the operation effect of the motor is ensured.

In the above embodiment, further, as shown in fig. 4, the first injection molding magnet 108 includes a main body 110 and a plurality of connecting portions 112, wherein the main body 110 is sleeved on the inner rotor core 102; the plurality of connection portions 112 are arranged along the circumferential direction of the main body 110, one ends of the plurality of connection portions 112 are connected to the main body 110, and the other ends of the plurality of connection portions 112 are connected to the ends of the plurality of outer rotor cores 104 in a one-to-one correspondence.

In this embodiment, the first injection magnet 108 may include a main body 110 sleeved on the inner rotor core 102 and a plurality of connection portions 112 connected to the main body 110. It is understood that the connection portions 112 are arranged outside the main body 110 in the circumferential direction of the main body 110 and connected to the main body 110, and meanwhile, the number of the connection portions 112 is the same as that of the outer rotor cores 104, and the connection portions 112 are connected to the outer rotor cores 104 in a one-to-one correspondence. That is, one end of the connection portion 112 is connected to the main body 110, and the other end of the connection portion 112 is connected to an end of the outer rotor core 104.

Through the arrangement of the main body 110 and the plurality of connecting portions 112, the stability of connection between the first injection molding magnet 108 and the inner rotor core 102 can be ensured, and the first injection molding magnet 108 can be connected with the plurality of outer rotor cores 104 at the same time, so as to realize connection between the inner rotor core 102 and the outer rotor cores 104.

Specifically, as shown in fig. 6 and 8, the body 110 may be provided in a circular or polygonal ring shape.

In any of the above embodiments, further, as shown in fig. 6, first protrusions 114 are provided on two sides of the end portion of the outer rotor core 104 close to the inner rotor core 102, and the connection portion 112 is wrapped on the first protrusions 114; two sides of one end of the outer rotor core 104 far away from the inner rotor core 102 are provided with second protrusions 116, and the end of the permanent magnet 106 is abutted against the second protrusions 116.

In this embodiment, the two sides of the end portion of the outer rotor core 104 close to the inner rotor core 102 are provided with the first protrusions 114, that is, between two adjacent outer rotor cores 104, the two first protrusions 114 extend towards between the two outer rotor cores 104, and on one hand, the two first protrusions 114 can limit the permanent magnet 106, so as to prevent the permanent magnet 106 from sliding towards the inner rotor core 102, and ensure the position of the permanent magnet 106. On the other hand, through the arrangement of the first protrusion 114, the connection portion 112 of the first injection molding magnet 108 can be wrapped on the first protrusion 114, so that the connection stability between the first injection molding magnet 108 and the outer rotor core 104 is further improved, and the structural integrity of the rotor assembly 100 is further ensured.

Further, two sides of one end of the outer rotor core 104, which is far away from the inner rotor core 102, are also provided with second protrusions 116, that is, between two adjacent outer rotor cores 104, the two second protrusions 116 also extend towards between the two outer rotor cores 104, so that the end of the permanent magnet 106 between two adjacent outer rotor cores 104 can be abutted against the second protrusions 116 to limit the permanent magnet 106. During the operation of the rotor assembly 100, the rotation of the rotor assembly 100 may cause the permanent magnet 106 to generate a centrifugal force, and the position of the permanent magnet 106 is ensured by abutting the permanent magnet 106 against the second protrusion 116, so that the centrifugal force of the permanent magnet 106 is offset by the second protrusion 116.

Further, the permanent magnet 106 comprises a first tangential magnetization permanent magnet. Specifically, as shown in fig. 2, the arrow direction indicates the magnetizing direction of the permanent magnet and the first injection-molded magnet.

Further, the permanent magnet 106 is not the same as the permanent magnet material of the first injection molded magnet 108 and the second injection molded magnet 118.

In a possible embodiment, referring to fig. 2, 3, and 5, the gap between the permanent magnet 106 and the outer rotor core 104 is also filled with an injection molded magnet (in fig. 3 and 5, the part of the injection molded magnet is wrapped around the permanent magnet 106), and the part of the injection molded magnet and the first and second injection molded magnets 108 and 118 can be molded in the same injection molding process. It should be understood that the injection molding magnet is formed by first assembling the inner rotor core 102, the outer rotor core 104 and the permanent magnet 106, then performing an injection molding filling process, and after curing, the injection molding magnet is an integral structure, i.e. the injection molding magnet in the gap between the permanent magnet 106 and the outer rotor core 104 is integrally connected with the first injection molding magnet 108 and the second injection molding magnet 118.

According to a second aspect of the present invention, as shown in fig. 9 and 10, there is provided a motor 300 including: a rotor assembly 100 as in any one of the previous claims.

The present invention provides an electrical machine 300 comprising a rotor assembly 100 according to the first aspect of the present invention. The first injection molding magnet 108 is arranged to replace a magnetic bridge, that is, the first injection molding magnet 108 has magnetism to offset leakage of the permanent magnet and the armature magnetic field, so that the operation efficiency of the motor 300 can be further improved.

Or, through the arrangement of the second injection molding magnet 118, a magnetic bridge between two adjacent permanent magnets in the related art can be replaced, so that the magnetic leakage of the permanent magnet and the armature magnetic field is offset through the magnetism of the second injection molding magnet 118, and the operation efficiency of the motor 300 can be further improved.

As shown in table 1, compared with the motor in the related art, under the condition that the size of the motor 300, the wire diameter of the winding, the number of turns, and the related parameters of the permanent magnet are the same, the motor 300 provided in the present application enables the body efficiency of the motor 300 to reach 0.870 through the arrangement of the first injection molding magnet 108 and the second injection molding magnet 118, which is higher than the body efficiency of the motor in the related art by 0.864, that is, the motor 300 provided in the present application can effectively improve the efficiency of the motor 300 through the arrangement of the first injection molding magnet 108 or the second injection molding magnet 118.

TABLE 1

	Tradition of the inventionPermanent magnet motor	The invention provides a motor
			Outer diameter/thickness/air gap (mm)	87/22/0.35	87/22/0.35
Number of stator slots/rotor poles	12/10	12/10
			Wire diameter (mm)/number of turns	0.38/285	0.38/285
Sloppy ratio (%)	81.3	81.3
			Silicon steel sheet	50W800	50W800
Permanent magnet	6B	6B
			Phase resistance (omega)	13.73	13.73
Phase current (A)	0.329	0.303
			Torque ripple (%)	4.70	3.67
Copper consumption (W)	4.45	3.78
			Iron loss (W)	2.57	2.82
Mechanical losses (W)	0.41	0.41
			Body efficiency	0.864	0.870

Further, the electric machine 300 includes a stator assembly 302, the number of stator slots of the stator assembly 302 is Ns, and the number of poles of the rotor assembly 100 is P, wherein P = Ns ± 2 or P = Ns ± 4.

Specifically, by setting the relationship between the number of poles of the rotor assembly 100 and the number of stator slots of the stator assembly 302, stable operation of the motor 300 is ensured, and operation efficiency of the motor 300 is ensured.

Specifically, as shown in fig. 10, the stator assembly 302 includes an annular stator yoke 304 and a plurality of stator teeth 306, the plurality of stator teeth 306 are arranged along a circumferential direction of the stator yoke 304, one end of the stator teeth 306 is connected to the stator yoke 304, and the other end extends toward an inside of the annular stator yoke 304. Further, stator assembly 302 also includes a plurality of windings 308, each winding 308 being wound around one of stator teeth 306. The rotor assembly is arranged in the stator assembly.

Further, the motor 300 includes a fan motor, a permanent magnet synchronous motor, a servo motor, or a stepping motor.

According to a third aspect of the present invention, an electrical apparatus is proposed, comprising a motor 300 according to any of the above-mentioned claims.

The present invention provides an electrical apparatus comprising a motor 300 according to the second aspect of the present invention. Thus, the overall benefits of the motor 300 described above are provided and will not be discussed in detail herein.

Further, the electric appliance includes an air conditioner, a refrigerator, or a washing machine.

In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and simplification of the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 invention. In this specification, the schematic representations of the terms used above 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 invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A rotor assembly, comprising:

an inner rotor core;

the outer rotor cores are arranged at intervals along the circumferential direction of the inner rotor core;

the permanent magnets are arranged between two adjacent outer rotor iron cores;

the first injection molding magnet is arranged between the inner rotor iron core and the outer rotor iron cores, and the inner rotor iron core and the outer rotor iron cores are connected through the first injection molding magnet.

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

a plurality of second magnets of moulding plastics, the second magnet of moulding plastics sets up in adjacent two between the outer rotor iron core, just the second magnet of moulding plastics is located the permanent magnet is kept away from the one end of inner rotor iron core.

3. The rotor assembly of claim 2 wherein the number of pole pairs of the permanent magnet is the same as the number of pole pairs of the first injection molded magnet and the number of pole pairs of the second injection molded magnet.

4. The rotor assembly of claim 2 wherein the remanent magnetization of the permanent magnet is greater than the remanent magnetization of the first injection molded magnet and the remanent magnetization of the second injection molded magnet.

5. The rotor assembly of any one of claims 1 to 4 wherein the first injection molded magnet comprises:

the main body is sleeved on the inner rotor iron core;

the outer rotor iron core comprises a main body, a plurality of connecting parts and a plurality of outer rotor iron cores, wherein the plurality of connecting parts are arranged along the circumferential direction of the main body, one ends of the plurality of connecting parts are connected with the main body, and the other ends of the plurality of connecting parts are connected with the end parts of the plurality of outer rotor iron cores in a one-to-one correspondence mode.

6. The rotor assembly of claim 5, wherein first protrusions are arranged on two sides of the end part of the outer rotor core close to the inner rotor core, and the connecting part is wrapped on the first protrusions;

and second bulges are arranged on two sides of one end, far away from the inner rotor iron core, of the outer rotor iron core, and the end parts of the permanent magnets are abutted against the second bulges.

7. The rotor assembly of any one of claims 1 to 4 wherein the permanent magnet comprises a first tangentially charged permanent magnet.

8. An electric machine, comprising:

a rotor assembly as claimed in any one of claims 1 to 7.

9. The electric machine of claim 8, comprising a stator assembly having a number of stator slots Ns and a number of poles P,

wherein P = Ns ± 2 or P = Ns ± 4.

10. An electric machine as claimed in claim 8 or 9, characterized in that the electric machine comprises a fan motor, a permanent magnet synchronous motor, a servo motor or a stepper motor.

11. An electrical device, comprising:

an electric machine as claimed in any one of claims 8 to 10.

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