CN217036866U - Rotor, permanent magnet motor and household appliance - Google Patents

Abstract

The utility model discloses a rotor, a permanent magnet motor and a household appliance, wherein the rotor comprises an inner iron core, an outer iron core and a retaining piece, the outer iron core is sleeved on the inner iron core, the outer iron core and the inner iron core are arranged at intervals along the inner and outer directions, a first space is defined between the outer iron core and the inner iron core, a first groove with an inward opening is formed in the inner peripheral surface of the outer iron core, and the first groove is communicated with the first space; a holder including a first holding portion and a second holding portion connected, the first holding portion being filled in the first space, the second holding portion being filled in the first groove. The rotor provided by the embodiment of the utility model has the advantages of good overall strength, less magnetic flux leakage and the like.

Description

Rotor, permanent magnet motor and household appliance

Technical Field

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

Background

The permanent magnet motor has higher power density and torque density, and is widely used in the field of household appliances. The rotor of the tangential permanent magnet motor in the related art is provided with a magnetic isolation bridge, which causes large magnetic leakage and low efficiency of the permanent magnet motor. In the sectional rotor core in the related technology, the inner core and the outer core are connected through an injection molding piece, and the problem that the leakage flux of the rotor and the integral strength of the rotor are difficult to take into account exists.

SUMMERY OF THE UTILITY MODEL

The present invention is based on the discovery and recognition by the inventors of the following facts and problems:

in the related art, the segmented rotor core comprises an inner core and an outer core, and the inner core and the outer core are connected through an injection molding piece. The inside of outer iron core sets up the arch towards inner iron core to increase the joint strength between inner iron core and the outer iron core. If the protrusions are arranged too large, the distance between the outer iron core and the inner iron core is large, so that the magnetic leakage of the rotor is increased, and the performance of the permanent magnet motor is influenced; if the undersize that the arch set up, then make the area of connection between plastic envelope spare and the outer iron core less, lead to the joint strength between interior iron core and the outer iron core low, rotor bulk strength is low.

The present invention is directed to solving, at least in part, one of the technical problems in the related art.

To this end, embodiments of the present invention propose a rotor to improve the overall strength of the rotor and reduce leakage flux.

The rotor comprises an inner iron core, an outer iron core and a retaining piece, wherein the outer iron core is sleeved on the inner iron core, the outer iron core and the inner iron core are arranged at intervals along the inner and outer directions, a first space is defined between the outer iron core and the inner iron core, a first groove with an inward opening is formed in the inner circumferential surface of the outer iron core, and the first groove is communicated with the first space; a holder including a first holding portion and a second holding portion connected, the first holding portion being filled in the first space, the second holding portion being filled in the first groove.

The rotor provided by the embodiment of the utility model has the advantages of good overall strength, less magnetic flux leakage and the like.

In some embodiments, the first groove has a groove bottom wall and first and second groove side walls opposing each other in the circumferential direction of the outer core, and a junction of the groove bottom wall and the first groove side wall and a junction of the groove bottom wall and the second groove side wall form a rounded corner.

In some embodiments, the outer core includes a plurality of rotor blocks arranged at intervals along a circumferential direction of the outer core, and the accommodating groove is defined between two adjacent rotor blocks; the rotor comprises a plurality of permanent magnets, the permanent magnets correspond to the accommodating grooves one by one, and the permanent magnets are arranged in the corresponding accommodating grooves; the holding tank has relative third slot side wall and fourth slot side wall in the circumference of outer iron core, the third slot side wall has towards the first arch of fourth slot side wall, the fourth slot side wall has towards the second arch of third slot side wall, each of first arch with the second arch supports and leans on with the holding tank corresponds the medial surface of permanent magnet.

In some embodiments, a second space is defined between the first protrusion, the third slot sidewall and the corresponding permanent magnet, and a third space is defined between the second protrusion, the fourth slot sidewall and the corresponding permanent magnet; the holder includes a third holding portion and a fourth holding portion, each of which is connected to the first holding portion, the third holding portion being filled in the second space, and the fourth holding portion being filled in the third space.

In some embodiments, the junction of the first projection and the third slot sidewall and the junction of the second projection and the fourth slot sidewall form a fillet.

In some embodiments, the first protrusion is disposed at an inner end of the third slot sidewall, the second protrusion is disposed at an inner end of the fourth slot sidewall, and the first protrusion and the second protrusion disposed on the same rotor block satisfy: the distance between the end of the first projection far away from the second projection and the end of the second projection far away from the first projection is greater than or equal to 6.5 mm.

In some embodiments, the depth of the first groove is 3mm or greater.

In some embodiments, at least a portion of the first groove tapers in width from the outside to the inside.

In some embodiments, the outer circumferential surface of the inner core has an outer protrusion located between two adjacent rotor blocks in the circumferential direction of the outer core, and a portion of the first holding portion is wrapped on the outer protrusion.

In some embodiments, the minimum distance between the first protrusion and the outer protrusion and the minimum distance between the second protrusion and the outer protrusion are equal to or greater than 3.5 mm.

In some embodiments, the outer protrusion includes a first portion, a second portion, and a third portion, the first portion and the second portion being spaced apart along a circumferential direction of the outer core;

in some embodiments, the third portion is located between the first portion and the second portion in a circumferential direction of the outer core, each of the first portion and the second portion is provided to protrude outward from the third portion, a second groove is formed between the first portion, the second portion, and the third portion, and a part of the first holding portion is filled in the second groove.

In some embodiments, the retainer is integrally injection molded.

The permanent magnet motor comprises a stator and a rotor, wherein the stator is provided with a stator hole; the rotor is arranged in the stator hole, and the rotor is the rotor in any one of the above embodiments.

The permanent magnet motor has the advantages of less magnetic flux leakage, good performance and the like.

The household appliance provided by the embodiment of the utility model comprises the permanent magnet motor in any embodiment.

The household appliance provided by the embodiment of the utility model has the advantages of good performance and the like.

Drawings

Fig. 1 is a schematic view of a rotor according to an embodiment of the present invention.

Fig. 2 is a front view of a rotor of one embodiment of the present invention (with the retainer removed).

Fig. 3 is an enlarged view of a point a in fig. 2.

Fig. 4 is a schematic view of the structures of the inner core and the outer core of fig. 2.

Fig. 5 is a schematic structural view of the inner core and one rotor block of fig. 2.

Fig. 6 is an enlarged view at B in fig. 5.

Fig. 7 is a schematic view of the structure of the rotor block of fig. 5.

Fig. 8 is a schematic view of the structure of the inner core of fig. 5.

Reference numerals:

a rotor 100;

an inner core 1; an outer protrusion 101; a first portion 1011; a second portion 1012; a third portion 1013; a second recess 1014; a first end face 102; a second end face 103;

an outer core 2; a rotor block 201; an accommodating groove 202; a third trough side wall 2021; a fourth slot sidewall 2022; a first space 203; a first groove 204; a trough bottom wall 2041; first slot side wall 2042; a second groove side wall 2043; a first protrusion 205; the second space 2051; a second protrusion 206; the third space 2061; a positioning hole 207; a connection hole 208; a third end face 209; a fourth end surface 210; the third protrusion 211; a fourth protrusion 212;

a permanent magnet 3; a fifth end surface 301; a sixth end face 302;

a holder 4; a first holding portion 401; a second holding portion 402; a fifth holding portion 403; a sixth holding portion 404; a seventh holding portion 405; an eighth holding portion 406; a ninth holding portion 407; a tenth holding portion 408; an eleventh holding portion 409.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.

As shown in fig. 1 to 8, a rotor 100 according to an embodiment of the present invention includes an inner core 1, an outer core 2, and a holder 4, the outer core 2 is sleeved on the inner core 1, the outer core 2 and the inner core 1 are arranged at intervals in an inner-outer direction, a first space 203 is defined between the outer core 2 and the inner core 1, a first groove 204 with an inward opening is formed on an inner circumferential surface of the outer core 2, and the first groove 204 is communicated with the first space 203. The holder 4 includes a first holding portion 401 and a second holding portion 402 connected, the first holding portion 401 being filled in the first space 203, the second holding portion 402 being filled in the first groove 204.

In the rotor 100 according to the embodiment of the present invention, on the one hand, the connection between the inner core 1 and the outer core 2 is achieved by the first holding portion 401 filled in the first space 203; on the other hand, the connection of the second holding portion 402 to the outer core 2 is achieved by the second holding portion 402 filled in the first recess 204, and the connection of the inner core 1 and the outer core 2 is achieved by the second holding portion 402 to the first holding portion 401.

The arrangement of the first groove 204 and the second holding portion 402 can increase the connection area of the holder 4 with the outer core 2, so that the connection strength between the inner core 1 and the outer core 2 can be increased, and the risk of cracking of the holder 4 can be reduced. In addition, first groove 204 is concavely arranged, so that first groove 204 does not affect the minimum distance between inner core 1 and outer core 2, and therefore, the magnetic leakage of rotor 100 can be reduced, and the performance of the permanent magnet motor with rotor 100 is improved.

Accordingly, the coupling strength between the inner core 1 and the outer core 2 is ensured, and the leakage flux of the rotor 100 is reduced.

Therefore, the rotor 100 according to the embodiment of the present invention has advantages of good overall strength and less magnetic flux leakage.

Alternatively, the inner core 1 has the first end face 102 and the second end face 103 opposed in the axial direction of the outer core 2, and the holder 4 includes a sixth holding portion 404 and a seventh holding portion 405, the sixth holding portion 404 being provided on a part of the first end face 102, and the seventh holding portion 405 being provided on a part of the second end face 103. One end of the first holding portion 401 is connected to the sixth holding portion 404, and the other end of the first holding portion 401 is connected to the seventh holding portion 405.

The outer core 2 has a third end surface 209 and a fourth end surface 210 opposed to each other in the axial direction of the outer core 2, and the holder 4 includes a tenth holding portion 408 and an eleventh holding portion 409, the tenth holding portion 408 being provided on the third end surface 209, and the eleventh holding portion 409 being provided on the fourth end surface 210. One end of the first holding portion 401 is connected to the tenth holding portion 408, and the other end of the first holding portion 401 is connected to the eleventh holding portion 409.

In order to make the technical solution of the present application easier to understand, the technical solution of the present application is further described below by taking as an example that the axial direction of the outer core 2 coincides with the up-down direction, which is shown in fig. 1.

For example, as shown in fig. 1, the first holding portion 401 extends in the vertical direction, the first end surface 102 is provided above the second end surface 103, the sixth holding portion 404 is provided on the first end surface 102, and the seventh holding portion 405 is provided on the second end surface 103. The third end surface 209 is provided above the fourth end surface 210, the tenth holding portion 408 is provided on the third end surface 209, and the eleventh holding portion 409 is provided on the fourth end surface 210. The upper end of the first holding portion 401 is connected to both the sixth holding portion 404 and the tenth holding portion 408, and the lower end of the first holding portion 401 is connected to both the seventh holding portion 405 and the eleventh holding portion 409.

In some embodiments, the depth of the first groove 204 is 3mm or greater. In other words, the size of the first groove 204 in the radial direction of the outer core 2 is 3mm or more.

For example, as shown in fig. 6, the depth of the first groove 204 is L1, and L1 is equal to or greater than 3 mm.

Thereby, the connection area of the second holding portion 402 and the first groove 204 can be increased, so that the connection area of the holder 4 and the outer core 2 can be further increased, and the connection strength between the inner core 1 and the outer core 2 can be further increased, further reducing the risk of cracking of the holder 4.

In some embodiments, the first groove 204 has a groove bottom wall 2041 and first and second groove side walls 2042, 2043 opposing each other in the circumferential direction of the outer core 2, the junction of the groove bottom wall 2041 and the first groove side wall 2042 and the junction of the groove bottom wall 2041 and the second groove side wall 2043 forming rounded corners.

Therefore, no sharp included angle exists in the first groove 204, so that the stress concentration phenomenon of the second holding part 402 can be well avoided, the risk of cracking of the holding part 4 is further reduced, and the overall strength of the rotor 100 is further improved.

Optionally, the width of at least a portion of the first groove 204 is gradually reduced from outside to inside. In other words, at least a part of the first groove is gradually reduced in size from outside to inside in the circumferential direction of the outer core 2.

Here, inward means a direction adjacent to the axis of the rotor 100 on a plane perpendicular to the axial direction of the outer core 2, and outward means a direction away from the axis of the rotor 100 on a plane perpendicular to the axial direction of the outer core 2, the inward and outward directions being shown in fig. 1, 2, and 4.

For example, as shown in fig. 3 to 7, the entire width of the first groove 204 is gradually reduced from the outside to the inside.

Therefore, the opening of the first groove 204 is a reduced opening, the first groove side wall 2042 and the second groove side wall 2043 can play a role in stopping the second retaining part 402, and the second retaining part 402 is prevented from being separated from the notch of the first groove 204 inwards, so that the connection strength between the inner iron core 1 and the outer iron core 2 can be further increased, and the risk of cracking of the retaining piece 4 is further reduced.

In some embodiments, the outer core 2 includes a plurality of rotor blocks 201, the plurality of rotor blocks 201 are arranged at intervals along a circumferential direction of the outer core 2, and an accommodating groove 202 is defined between adjacent two rotor blocks 201. The rotor 100 includes a plurality of permanent magnets 3, and a plurality of permanent magnets 3 and a plurality of holding grooves 202 are in one-to-one correspondence, and the permanent magnets 3 are disposed in the corresponding holding grooves 202.

The receiving groove 202 has a third groove side wall 2021 and a fourth groove side wall 2022 opposed in the circumferential direction of the outer core 2, the third groove side wall 2021 having a first projection 205 toward the fourth groove side wall 2022, the fourth groove side wall 2022 having a second projection 206 toward the third groove side wall 2021. Each of the first projection 205 and the second projection 206 abuts on the inner side surface of the permanent magnet 3 corresponding to the accommodation groove 202.

For example, as shown in fig. 2 and 4, the outer core 2 includes ten rotor blocks 201, the ten rotor blocks 201 being arranged at intervals in the circumferential direction of the outer core 2, the ten rotor blocks 201 defining ten accommodation grooves 202. There are ten permanent magnets 3, and ten permanent magnets 3 correspond to ten accommodating grooves 202 one to one, and each permanent magnet 3 is disposed in the corresponding accommodating groove 202.

Optionally, the third slot sidewall 2021 has a third protrusion 211 facing the fourth slot sidewall 2022, and the fourth slot sidewall 2022 has a fourth protrusion 212 facing the third slot sidewall 2021. Each of the third protrusion 211 and the fourth protrusion 212 abuts on the outer side surface of the permanent magnet 3 corresponding to the accommodation groove 202.

Alternatively, the permanent magnet 3 has a fifth end face 301 and a sixth end face 302 opposed in the axial direction of the outer core 2, and the holder 4 includes an eighth holding portion 406 and a ninth holding portion 407, the eighth holding portion 406 being provided on the fifth end face 301, and the ninth holding portion 407 being provided on the sixth end face 302. One end of the first holding portion 401 is connected to the eighth holding portion 406, and the other end of the first holding portion 401 is connected to the ninth holding portion 407.

For example, as shown in fig. 1, the fifth end surface 301 is provided above the sixth end surface 302, the eighth holding portion 406 is provided on the fifth end surface 301, and the ninth holding portion 407 is provided on the sixth end surface 302. The upper end of the first holding portion 401 is connected to the eighth holding portion 406, and the lower end of the first holding portion 401 is connected to the ninth holding portion 407.

Alternatively, the rotor block 201 has a positioning hole 207 and a connection hole 208, and the positioning hole 207 is located outside the connection hole 208. The holder 4 includes a fifth holding portion 403, the fifth holding portion 403 being connected to the first holding portion 401, the fifth holding portion 403 being filled in the connecting hole 208.

For example, as shown in fig. 1, the fifth holding portion 403 extends in the up-down direction, the upper end of the fifth holding portion 403 is connected to the sixth holding portion 404, and the lower end of the fifth holding portion 404 is connected to the seventh holding portion 405, so that the fifth holding portion 403 is connected to the first holding portion 401.

Alternatively, as shown in fig. 2, 4, 5 and 7, the cross section of the connection hole 208 is substantially triangular, and two adjacent sides of the connection hole 208 form a round angle therebetween.

Therefore, no sharp included angle exists in the connecting hole 208, so that the stress concentration phenomenon of the fifth holding part 403 can be well avoided, the risk of cracking of the holding part 4 is further reduced, and the overall strength of the rotor 100 is further improved.

Alternatively, as shown in fig. 3, a second space 2051 is defined between the first protrusion 205, the third slot side wall 2021, and the corresponding permanent magnet 3. A third space 2061 is defined between the second protrusion 206, the fourth slot side wall 2022, and the corresponding permanent magnet 3.

The holder 4 includes a third holding portion and a fourth holding portion, each of which is connected to the first holding portion 401, the third holding portion is filled in the second space 2051, and the fourth holding portion is filled in the third space 2061.

The provision of the second space 2051 and the third holding portion may further increase the connection area of the holder 4 with the outer core 2, so that the connection strength between the inner core 1 and the outer core 2 may be further increased, further reducing the risk of cracking of the holder 4. The provision of the third space 2061 and the fourth holding portion can further increase the connection area of the holder 4 and the outer core 2, so that the connection strength between the inner core 1 and the outer core 2 can be further increased, and the risk of cracking of the holder 4 can be further reduced.

Alternatively, as shown in fig. 3, the junction of the first protrusion 205 and the third groove sidewall 2021 and the junction of the second protrusion 206 and the fourth groove sidewall 2022 are rounded.

Therefore, sharp included angles do not exist at the joint of the first protrusion 205 and the third groove side wall 2021 and at the joint of the second protrusion 206 and the fourth groove side wall 2022, so that the stress concentration phenomenon of the third holding part and the fourth holding part can be well avoided, the risk of cracking of the holding part 4 is further reduced, and the overall strength of the rotor 100 is further improved.

Alternatively, the first protrusion 205 is provided at the inner end of the third tank sidewall 2021, and the second protrusion 206 is provided at the inner end of the fourth tank sidewall 2022. The first protrusion 205 and the second protrusion 206 provided on the same rotor block 201 satisfy: the distance between the end of the first projection 205 remote from the second projection 206 and the end of the second projection 206 remote from the first projection 205 is 6.5mm or more.

As shown in fig. 7, the distance between the end of the first projection 205 remote from the second projection 206 and the end of the second projection 206 remote from the first projection 205 is L2, and L2 is 6.5mm or more.

Thus, the lengths of the first protrusion 205 and the second protrusion 206 are made longer, which is advantageous for increasing the connection area between the first holding portion 401 and the first protrusion 205 and between the first holding portion 401 and the second protrusion 206, so that the connection strength between the inner core 1 and the outer core 2 can be further increased, and the risk of cracking of the holder 4 can be further reduced.

Alternatively, the outer peripheral surface of the inner core 1 has outer protrusions 101, the outer protrusions 101 are located between two adjacent rotor blocks 201 in the circumferential direction of the outer core 2, and a part of the first holding portion 401 is wrapped on the outer protrusions 101.

For example, as shown in fig. 4, the outer protrusion 101 is located at a middle position of two adjacent rotor blocks 201 in the circumferential direction of the outer core 2.

Therefore, the arrangement of the outer protrusion 101 can increase the connection area of the holder 4 and the inner core 1, so that the connection strength between the inner core 1 and the outer core 2 can be increased, and the risk of cracking of the holder 4 is reduced. In addition, the outer protrusion 101 is disposed at a position such that the local areas between the outer protrusion 101 and the first protrusion 205 and the second protrusion 206 are not too small, thereby further reducing the magnetic flux leakage of the rotor 100 and improving the performance of the permanent magnet motor.

Optionally, the minimum distance between the first protrusion 205 and the outer protrusion 101 and the minimum distance between the second protrusion 206 and the outer protrusion 101 are equal to or greater than 3.5 mm.

For example, as shown in fig. 6, the first protrusion 205 and the second protrusion 206 are symmetrically arranged about the first groove 204, the minimum distance between the first protrusion 205 and the outer protrusion 101 is equal to the minimum distance between the second protrusion 206 and the outer protrusion 101, the minimum distance between the first protrusion 205 and the outer protrusion 101 is L3, and L3 is equal to or greater than 3.5 mm.

Therefore, the distance between the first protrusion 205 and the outer protrusion 101 and the distance between the second protrusion 206 and the outer protrusion 101 are both large, which is beneficial to further reducing the magnetic leakage of the rotor 100 and improving the performance of the permanent magnet motor.

Alternatively, as shown in fig. 6, the outer protrusion 101 includes a first portion 1011, a second portion 1012, and a third portion 1013, the first portion 1011 and the second portion 1012 being arranged at intervals in the circumferential direction of the outer core 2, the third portion 1013 being located between the first portion 1011 and the second portion 1012 in the circumferential direction of the outer core 2. Each of the first and second portions 1011 and 1012 is disposed to project outwardly of the third portion 1013, the first, second, and third portions 1011, 1012, and 1013 forming a second recess 1014 therebetween, a portion of the first retaining portion 401 filling the second recess 1014.

It will be appreciated that the provision of each of first portion 1011 and second portion 1012 projecting outwardly of third portion 1013 means that a portion of first portion 1011 is provided projecting outwardly of second portion 1012 and a portion of second portion 1012 is provided projecting outwardly of second portion 1012.

The provision of the second recess 1014 can increase the connection area of the holder 4 with the inner core 1, so that the connection strength between the inner core 1 and the outer core 2 can be increased, and the risk of cracking of the holder 4 can be reduced.

Alternatively, the holder 4 is injection molded in one piece. In other words, the first holding portion 401, the second holding portion 402, the third holding portion, the fourth holding portion, the fifth holding portion 403, the sixth holding portion 404, the seventh holding portion 405, the eighth holding portion 406, the ninth holding portion 407, the tenth holding portion 408, and the eleventh holding portion 409 are integrally injection molded.

The permanent magnet motor comprises a stator and a rotor, wherein the stator is provided with a stator hole, the rotor is arranged in the stator hole, and the rotor is the rotor in any embodiment.

Therefore, the permanent magnet motor provided by the embodiment of the utility model has the advantages of less magnetic flux leakage, good performance and the like.

The household appliance provided by the embodiment of the utility model comprises the permanent magnet motor provided by any one of the embodiments.

Therefore, the household appliance provided by the embodiment of the utility model has the advantages of good performance and the like.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific 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 disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (14)

1. A rotor, comprising:

an inner core;

the outer iron core is sleeved on the inner iron core, the outer iron core and the inner iron core are arranged at intervals along the inner and outer directions, a first space is defined between the outer iron core and the inner iron core, a first groove with an inward opening is formed in the inner circumferential surface of the outer iron core, and the first groove is communicated with the first space; and

a holder including a first holding portion and a second holding portion connected, the first holding portion being filled in the first space, the second holding portion being filled in the first groove.

2. The rotor of claim 1, wherein the first groove has a groove bottom wall and first and second groove side walls opposed in a circumferential direction of the outer core, and a junction of the groove bottom wall and the first groove side wall and a junction of the groove bottom wall and the second groove side wall form a rounded corner.

3. The rotor of claim 2, wherein the outer core comprises a plurality of rotor blocks arranged at intervals along a circumferential direction of the outer core, and an accommodating groove is defined between two adjacent rotor blocks;

the rotor comprises a plurality of permanent magnets, the permanent magnets correspond to the accommodating grooves one by one, and the permanent magnets are arranged in the corresponding accommodating grooves;

the holding tank has relative third slot side wall and fourth slot side wall in the circumference of outer iron core, the third slot side wall has towards the first arch of fourth slot side wall, the fourth slot side wall has towards the second arch of third slot side wall, each of first arch with the second arch supports and leans on with the holding tank corresponds the medial surface of permanent magnet.

4. The rotor of claim 3, wherein a second space is defined between the first protrusion, the third slot sidewall, and the corresponding permanent magnet, and a third space is defined between the second protrusion, the fourth slot sidewall, and the corresponding permanent magnet;

the holder includes a third holding portion and a fourth holding portion, each of which is connected to the first holding portion, the third holding portion being filled in the second space, and the fourth holding portion being filled in the third space.

5. The rotor of claim 3 wherein the junction of the first projection and the third slot sidewall and the junction of the second projection and the fourth slot sidewall form rounded corners.

6. The rotor of claim 3, wherein the first protrusion is provided at an inner end of the third slot sidewall, the second protrusion is provided at an inner end of the fourth slot sidewall, and the first protrusion and the second protrusion provided on the same rotor block satisfy:

the distance between the end of the first protrusion far away from the second protrusion and the end of the second protrusion far away from the first protrusion is greater than or equal to 6.5 mm.

7. A rotor according to any of claims 1-6, wherein the depth of the first groove is 3mm or more.

8. The rotor of any one of claims 1-6, wherein at least a portion of the first groove tapers in width from outside to inside.

9. The rotor according to any one of claims 3 to 6, wherein an outer circumference of the inner core has an outer protrusion located between two adjacent rotor blocks in a circumferential direction of the outer core, and a part of the first holding portion is wrapped around the outer protrusion.

10. The rotor of claim 9 wherein the minimum distance between the first lobe and the outer lobe and the minimum distance between the second lobe and the outer lobe is greater than or equal to 3.5 mm.

11. The rotor of claim 9, wherein the outer protrusion comprises:

first and second portions arranged at intervals in a circumferential direction of the outer core; and

a third portion located between the first portion and the second portion in a circumferential direction of the outer core, each of the first portion and the second portion being provided to protrude outward from the third portion, a second groove being formed between the first portion, the second portion, and the third portion, a part of the first holding portion being filled in the second groove.

12. A rotor according to any of claims 1-6, characterized in that the holder is injection moulded in one piece.

13. A permanent magnet electric machine, comprising:

a stator having a stator bore; and

a rotor disposed within the stator bore, the rotor being as claimed in any one of claims 1 to 12.

14. A household appliance comprising a permanent magnet motor according to claim 13.

Images