CN115224838A

CN115224838A - Rotor subassembly, motor and domestic appliance

Info

Publication number: CN115224838A
Application number: CN202110419169.0A
Authority: CN
Inventors: 陈雨; 周海东; 周倩云; 郑浩; 李萍
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2022-10-21

Abstract

The invention discloses a rotor assembly, a motor and a household appliance, wherein the rotor assembly comprises a rotor core and a permanent magnet, a plurality of outer core units surround an inner core to form the outer core, the inner core is formed by laminating a first ring sheet and a second ring sheet, a first bulge is arranged on the outer side of the first ring sheet along the circumferential direction of the rotor core, and the bonding force between the inner core and an injection molding body can be increased through the first bulge, so that the inner core and the injection molding body are connected more tightly, the structural strength is improved, and the stability of the rotor assembly when outputting large torque is improved; the second ring piece is not provided with the first protrusions, so that a protrusion structure outside the inner iron core is reduced, magnetic leakage of the inner iron core of a magnetic circuit is reduced, and the running stability and reliability of the motor are improved.

Description

Rotor subassembly, motor and domestic appliance

Technical Field

The invention relates to the technical field of motor correlation, in particular to a rotor assembly, a motor and a household appliance.

Background

The built-in permanent magnet motor has the advantages of high power density and the like, and is widely used in the field of household appliances. At present, a rotor core of the built-in permanent magnet motor is generally connected with an internal core shaft sleeve through an internal magnetic bridge, and the structure cannot increase the insulativity between a rotating shaft and the core, so that the bearing is easily subjected to electric corrosion, and the reliability is reduced. In the related art, the rotor core is connected with the shaft sleeve by an injection molding body, but the structure has the problem of unreasonable design, and the stability of the rotor when outputting large torque is influenced by the connection tightness of the shaft sleeve and the injection molding material.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the rotor assembly provided by the invention has the advantages that the binding force between the inner iron core and the injection molding body is effectively increased, the structural strength is improved, and the reliability is higher.

The invention also provides a motor and a household appliance comprising the rotor assembly.

A rotor assembly according to an embodiment of the first aspect of the invention, comprising:

the rotor core comprises an inner core and an outer core, the inner core is provided with a shaft hole for mounting a rotating shaft, the outer core is provided with an accommodating groove, and the outer core and the inner core are arranged at intervals;

the permanent magnet is arranged in the accommodating groove;

the injection molding body is at least filled between the inner iron core and the outer iron core;

wherein, outer iron core includes around a plurality of outer iron core units that interior iron core interval set up, adjacent form between the outer iron core unit the holding tank, interior iron core includes the edge first ring piece and the second ring piece that rotor core's axial is range upon range of, the periphery of first ring piece is along for the periphery of second ring piece is formed with a plurality of first archs, and is a plurality of along outside the protrusion first arch is followed the circumference interval distribution of first ring piece.

The rotor assembly provided by the embodiment of the invention has at least the following beneficial effects:

the outer iron core and the inner iron core can be connected through the injection molding body to form the rotor iron core, so that insulation is formed between the rotating shaft and the outer iron core, the shaft voltage is effectively reduced, the electric corrosion of the bearing is reduced, and the reliability of the motor is improved; the plurality of outer iron core units surround the inner iron core to form an outer iron core, the inner iron core is formed by laminating the first ring sheets and the second ring sheets, the first bulges are arranged at intervals on the periphery of the first ring sheets, and the binding force between the inner iron core and the injection molding body can be increased through the first bulges, so that the inner iron core and the injection molding body are connected more tightly, the structural strength is improved, and the stability of the rotor assembly when outputting large torque is improved; the periphery of second ring circle piece is along not having first arch, and the outside of iron core in the first arch incomplete cover is favorable to reducing the protruding structure in the iron core outside promptly to reduce the magnetic leakage of iron core including the magnetic circuit, effectively reduce the permanent magnet along the radial inboard self-copulation chain magnetic leakage of rotor core, improve the stability and the reliability of motor operation.

According to some embodiments of the invention, the second ring sheet is a ring-shaped substrate, and the first ring sheet is composed of the ring-shaped substrate and a plurality of first protrusions distributed at intervals along the circumference of the ring-shaped substrate.

According to some embodiments of the present invention, the first ring bead and the second ring bead are alternately arranged in an axial direction of the rotor core.

According to some embodiments of the present invention, the first ring pieces are disposed at both ends of the inner core in an axial direction of the rotor core, and the second ring pieces are disposed between the first ring pieces at both ends of the inner core.

According to some embodiments of the invention, the first protrusions and the permanent magnets are arranged in a one-to-one correspondence and at intervals, and the injection molding body is filled between the first protrusions and the permanent magnets.

According to some embodiments of the present invention, each of the outer core units includes a plurality of segments stacked in an axial direction of the rotor core, and second protrusions for positioning the permanent magnets are provided on an inner side of the segments toward the inner core direction.

According to some embodiments of the present invention, the second projection includes a first extension section extending in a circumferential direction of the rotor core and a second extension section extending in the circumferential direction of the rotor core and toward a direction away from the first extension section.

According to some embodiments of the present invention, the second protrusion further includes a third protrusion, and the third protrusion is disposed between the first extension section and the second extension section and extends toward the inner core.

According to some embodiments of the present invention, an end portion of the third protrusion is provided with a third extending section extending in a circumferential direction of the rotor core and a fourth extending section extending in the circumferential direction of the rotor core and toward a direction away from the third extending section.

According to some embodiments of the present invention, a distance between the first protrusion and the inner core along the radial direction of the rotor core is L1, and 1.5mm ≦ L1 ≦ 2mm is satisfied.

According to some embodiments of the present invention, a height of the first protrusion and the second protrusion in a circumferential direction of the rotor core is L2, and L2 ≦ 1mm is satisfied.

According to some embodiments of the present invention, outer sides of the adjacent segments are connected at both ends of the outer core in the axial direction of the rotor core.

According to some embodiments of the invention, the first ring piece is provided with a first positioning groove on an inner side thereof, and the second ring piece is provided with a second positioning groove on an inner side thereof, the first positioning groove and the second positioning groove corresponding to each other in an axial direction of the rotor core for positioning the first ring piece and the second ring piece.

According to some embodiments of the present invention, each of the outer core units is provided with a first through hole, the first through hole penetrates through the corresponding outer core unit along an axial direction of the rotor core, and the injection molding body is filled in the first through hole.

According to some embodiments of the invention, each of the outer core units is provided with a second through hole penetrating the corresponding outer core unit in an axial direction of the rotor core for positioning the corresponding outer core unit.

According to some embodiments of the invention, the second through hole comprises a polygonal hole site and a circular hole site, and a center of the polygonal hole site coincides with a center of the circular hole site.

An electric machine according to an embodiment of the second aspect of the invention comprises a rotor assembly as described above in relation to the embodiment of the first aspect.

A household appliance according to an embodiment of the third aspect of the invention comprises the motor of the embodiment of the second aspect.

Additional features and advantages of the invention will be set forth 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 is a schematic structural view of a rotor core and permanent magnets in combination according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first punching sheet according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a second punching sheet according to an embodiment of the present invention;

FIG. 4 is a schematic view of a first loop field of one embodiment of the invention;

FIG. 5 is a schematic view of a second loop patch in accordance with one embodiment of the invention;

fig. 6 is a schematic perspective view of an inner core according to an embodiment of the present invention;

fig. 7 is a schematic perspective view of an inner core according to another embodiment of the present invention;

FIG. 8 is a schematic view of the combination of the first fan-shaped segment and the first loop bundle of the present invention;

fig. 9 is a schematic structural diagram of a first punching sheet according to another embodiment of the present invention;

FIG. 10 is an enlarged schematic view of the structure at A in FIG. 9;

fig. 11 is a schematic structural diagram of a third punching sheet according to an embodiment of the present invention;

FIG. 12 is a schematic cross-sectional view of a rotor assembly according to an embodiment of the present invention;

FIG. 13 is a schematic view, partially in section, of a rotor assembly in accordance with an embodiment of the present invention;

fig. 14 is a schematic structural view of a rotor according to an embodiment of the present invention.

Reference numerals:

a rotor assembly 1000;

a rotating shaft 2000;

the rotor core 100, the inner core 110, the shaft hole 111, the second clinching point 112, the outer core 120, the second protrusion 121, the first extension 1211, the second extension 1212, the fourth protrusion 122, the first through hole 123, the second through hole 124, the rectangular hole 1241, the circular hole 1242, the third protrusion 125, the third extension 1251, the fourth extension 1252, the first punched piece 130, the first hoop 131, the first protrusion 1311, the first positioning groove 1312, the first fan-shaped piece 132, the second punched piece 140, the second hoop 141, the second positioning groove 1411, the second fan-shaped piece 142, the outer core unit 150, the first clinching point 151, the third punched piece 160, the third fan-shaped piece 161, the outer magnetic bridge 1611, and the accommodating groove 170;

a permanent magnet 200;

injection molded body 300.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, if there are first, second, etc. described, it is only for the purpose of distinguishing technical features, and it is not understood that relative importance is indicated or implied or that the number of indicated technical features is implicitly indicated or that the precedence of the indicated technical features is implicitly indicated.

In the description of the present invention, it should be noted that the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the terms in the present invention by combining the specific contents of the technical solutions.

A rotor assembly 1000 suitable for an interior permanent magnet machine according to an embodiment of the present invention is described with reference to fig. 1 to 14. The rotor assembly 1000 is described below with a specific example.

Referring to fig. 1, a rotor assembly 1000 according to an embodiment of the present invention includes a rotor core 100 and a plurality of permanent magnets 200, wherein the rotor core 100 includes an inner core 110 and an outer core 120, the outer core 120 includes a plurality of outer core units 150, the plurality of outer core units 150 are arranged at intervals around the inner core 110, and receiving slots 170 are formed between adjacent outer core units 150 at intervals, such that a plurality of receiving slots 170 are distributed along a circumferential direction of the outer core 120, and the permanent magnets 200 are embedded in the receiving slots 170, such that the permanent magnets 200 are disposed inside the outer core 120.

Referring to fig. 1, fig. 1 is a schematic cross-sectional view of a rotor assembly 1000 taken perpendicular to an axial direction of a rotor core 100. The rotor core 100 includes 2P

outer core units

150 and 1 inner core 110, where 2P is the number of rotor poles, 2P of the outer core units 150 is 10 in fig. 1, and the number of permanent magnets 200 is also 10.

In order to uniformly distribute the magnetic circuit, a plurality of receiving slots 170 are uniformly distributed along the circumferential direction of the outer core 120, so that the permanent magnets 200 can be uniformly arranged in the receiving slots 170, and the permanent magnets 200 penetrate the outer core 120 in the axial direction of the rotor core 100.

In addition, the inner core 110 is provided with a shaft hole 111, and the rotating shaft 2000 is assembled in the shaft hole 111, for example, the rotating shaft 2000 is connected with the inner core 110 by an interference fit manner, which is not described in detail again.

Considering that a potential difference is generated between the rotor core 100 and an end cap (not shown in the drawings) when the motor operates, in the related art, the outer core 120 and the inner core 110 are connected by the inner magnetic bridge, a shaft voltage is generated at the rotating shaft 2000, and the bearing on the end cap is electrically corroded, so that the bearing is damaged, and the reliability is reduced. Based on this, as shown in fig. 1, in the embodiment, each outer core unit 150 is separated from the inner core 110, and an insulating non-magnetic conductive material is filled between the outer core unit 150 and the inner core 110 by injection molding to form the injection molded body 300, and the outer core 120, the inner core 110 and the permanent magnet 200 can be integrated by the injection molded body 300.

Referring to fig. 1, it can be understood that adjacent outer core units 150 are disconnected, and the receiving slots 170 are open along the inner side of the rotor core 100 and correspond to the inner core 110, so that the injection molded body 300 can cover the side of the permanent magnet 200 facing the inner core 110, and insulation is formed between the outer core 120 and the inner core 110 and between the permanent magnet 200 and the inner core 110, thereby improving insulation between the rotating shaft 2000 and the outer core 120, effectively reducing shaft voltage, reducing electric corrosion of the bearing, and achieving higher reliability.

It should be noted that the injection molded body 300 is formed between the outer core 120 and the inner core 110 and in the gap between the permanent magnet 200 and the inner core 110 by injection molding, and may be further filled in the gap between the permanent magnet 200 and the outer core 120, so that the outer core 120 and the permanent magnet 200 are combined more stably and have higher reliability. In the embodiment, the injection molded body 300 may be made of resin, and is not limited to a specific example.

Referring to fig. 1, in the embodiment, the permanent magnet 200 has a rectangular parallelepiped structure, and the permanent magnet 200 may be a ferrite-based sintered magnet or a neodymium magnet. The holding groove 170 matched with the permanent magnet 200 is defined between the adjacent outer iron core units 150, each outer iron core unit 150 is approximately in a fan-shaped shape, and thus the plurality of outer iron core units 150 and the plurality of permanent magnets 200 are alternately arranged along the circumferential direction of the rotor core 100 to form the cylindrical rotor core 100, so that the structural design is more reasonable, and the rotor core is more practical and reliable.

It is understood that the rotor core 100 may be formed by laminating and pressing punching sheets, and specifically, the rotor core 100 includes a plurality of first punching sheets 130 and a plurality of second punching sheets 140.

Fig. 2 shows a schematic structural diagram of the first stamped sheet 130, where the first stamped sheet 130 includes a first ring segment 131 and a plurality of first fan-shaped segments 132, the plurality of first fan-shaped segments 132 are arranged along a circumferential direction of the rotor core 100 and at intervals around the first ring segment 131, the first ring segment 131 is located at a central position of the first stamped sheet 130, the number of the first fan-shaped segments 132 is the same as the number of the outer core units 150, and the number of the first ring segment 131 is the same as the number of the inner core units 110, that is, each first stamped sheet 130 has 10 first fan-shaped

segments

132 and 1 first ring segment 131. The first fan-shaped piece 132 has a substantially fan-shaped shape, and the first loop wheel piece 131 has a substantially annular shape.

Fig. 3 shows a structural schematic diagram of the second punching sheet 140, specifically, the second punching sheet 140 includes a second circle-ring sheet 141 and a plurality of second fan-shaped sheets 142, the plurality of second fan-shaped sheets 142 are arranged at intervals around the second circle-ring sheet 141, the second circle-ring sheet 141 is located at a central position of the second punching sheet 140, each second punching sheet 140 has 10 second fan-shaped

sheets

142 and 1 second circle-ring sheet 141, the second fan-shaped sheets 142 are substantially in a fan shape, and the second circle-ring sheets 141 are substantially in a ring shape.

It is understood that each of the first punching sheets 130 and each of the second punching sheets 140 are individually laminated in a single layer, and the first segment 132 corresponds to the second segment 142 and the first ring segment 131 corresponds to the second ring segment 141 when the first punching sheets and the second punching sheets are laminated, so that the rotor core 100 is formed by laminating and pressing the plurality of first punching sheets 130 and the plurality of second punching sheets 140.

The first segments 132 and the second segments 142 are stacked to form the outer core unit 150, and the first segments 132 and the second segments 142 are arranged at intervals along the circumferential direction of the rotor core 100, so that a plurality of outer core units 150 are formed, and the outer core 120 is obtained. The first ring segments 131 and the second ring segments 141 are stacked to form the inner core 110, thereby realizing the rotor core 100 by stacking.

It should be noted that the first fan-shaped piece 132 and the second fan-shaped piece 142 have the same structure, and the first punching piece 130 and the second punching piece 140 are different in that the first ring loop piece 131 and the second ring loop piece 141 have different structures, specifically, fig. 4 shows a schematic structural diagram of the first ring loop piece 131, the outer side of the first ring loop piece 131 is provided with a plurality of first protrusions 1311, and the plurality of first protrusions 1311 are distributed at intervals in the circumferential direction of the first ring loop piece 131.

It can be understood that the first protrusion 1311 is formed protruding from the outer periphery of the first loop piece 131, and the second loop piece 141 does not have the first protrusion 1311 at the outer side, and fig. 5 is a schematic structural view of the second loop piece 141. When the first ring piece 131 and the second ring piece 141 are stacked to form the inner core 110, the first protrusion 1311 protrudes out of the inner core 110, so that the first ring piece 131 and the second ring piece 141 are not completely overlapped, that is, the first protrusion 1311 is only distributed at a partial position of the outer core 120 along the axial direction of the rotor core 100, and is not completely covered on the outer side of the inner core 110.

Referring to fig. 1, it can be understood that the first protrusions 1311 extend toward the receiving groove 170, the first protrusions 1311 are a protrusion structure of the outer peripheral edge of the first loop piece 131, and the first protrusions 1311 are not limited to a specific shape. When the injection molding material is filled between the inner core 110 and the outer core 120, the injection molding material can cover all the first protrusions 1311, namely, the first protrusions 1311 are embedded into the injection molding body 300, so that the effect of increasing the bonding force between the inner core 110 and the injection molding body 300 is achieved, the inner core 110 and the injection molding body 300 are connected more tightly, the structural strength is effectively improved, the overall strength of the formed rotor assembly 1000 is higher, and the stability of the rotor assembly 1000 when outputting large torque is improved.

Referring to fig. 4 and 5, for the structure that the outer side of the inner core 110 completely covers the first protrusion 1311, in this embodiment, the first ring piece 131 with the first protrusion 1311 and the second ring piece 141 without the first protrusion 1311 are combined to reduce the number of the first protrusion 1311, so that leakage of the magnetic path at the position of the protrusion structure outside the inner core 110 can be reduced, and the effect of reducing leakage flux is achieved, thereby effectively reducing the leakage flux of the self-link flux inside the permanent magnet 200, further improving the magnetic performance of the motor, ensuring the stability and reliability of the operation of the motor, and reducing the protrusion structure is beneficial to reducing the manufacturing cost, and the structure is more practical and reliable.

It should be noted that the distribution structure of the first protrusions 1311 is set according to the arrangement manner of the first punching sheets 130 and the second punching sheets 140 along the axial direction of the rotor core 100, for example, the first punching sheets 130 and the second punching sheets 140 may be arranged in an alternating lamination manner, so that the first protrusions 1311 are distributed at intervals along the axial direction of the inner core 110. For another example, the first punching sheets 130 may be stacked to form a first punching sheet group, the second punching sheets 140 may be stacked to form a second punching sheet group, and then the first punching sheet group and the second punching sheet group are stacked together. The above are only examples, and the specific arrangement manner is set according to the actual application requirement, and is not described again.

Referring to fig. 5, in an embodiment, the second ring piece 141 is an annular base piece, and the annular shape is substantially an annular shape, it is understood that the annular base piece is a stamped annular metal piece, and the outer circumferential edge of the annular base piece is not limited to a smooth circular arc edge, but may be an outer side edge formed in a polygonal shape or a multi-segment circular arc shape, so that the second ring piece 141 is substantially an annular shape as a whole.

Referring to fig. 4, the first loop coil 131 is composed of a circular base plate and a plurality of first protrusions 1311, and the plurality of first protrusions 1311 are spaced apart from each other in the circumferential direction of the circular base plate.

It can be understood that when first ring loop piece 131 and second ring loop piece 141 are stacked, in the axial direction of rotor core 100, the annular base portions of first ring loop piece 131 and second ring loop piece 141 can overlap, and the first protrusion 1311 portion of the outer peripheral edge of first ring loop piece 131 does not overlap with second ring loop piece 141, so that first protrusion 1311 protrudes from first ring loop piece 131 relative to second ring loop piece 141.

Referring to fig. 6, in an embodiment, the number of the first protrusions 1311 disposed on the first ring piece 131 is the same as the number of the permanent magnets 200, specifically, taking the rotor core 100 having 10 permanent magnets 200 as an example, 10 first protrusions 1311 are disposed on each first ring piece 131, the first protrusions 1311 are uniformly distributed on the outer side of the first ring piece 131, and the first punching pieces 130 and the second punching pieces 140 are alternately disposed along the axial direction of the rotor core 100.

Fig. 6 is a schematic structural view illustrating the inner core 110 formed by stacking the first ring piece 131 and the second ring piece 141, it can be understood that the first segment 132 and the second segment 142 have the same structure, and the overall structure of the outer core 120 is the same regardless of the arrangement of the first stamped sheet 130 and the second stamped sheet 140, and the structure of the outer core 120 is omitted in fig. 6.

It can be understood that, first ring piece 131 and second ring piece 141 are stacked alternately, in the axial direction of rotor core 100 like this, first arch 1311 is in the outer side of inner core 110 unit at equal intervals, and because do not have first arch 1311 on second ring piece 141, first ring piece 131 and second ring piece 141 do not coincide, first arch 1311 does not cover the outside of inner core 110 unit along the axial of rotor core 100 completely like this, thereby reduce the protruding structure in the outer side of inner core 110, play the effect of reducing the magnetic leakage, reduce the self-interlinkage magnetic leakage of the inboard permanent magnet 200, be favorable to improving the magnetic performance of motor, guarantee the stability and the reliability of motor operation.

The first punching sheets 130 and the second punching sheets 140 are not limited to being stacked alternately in the axial direction of the rotor core 100, and may be arranged alternately in the form of punching groups. For example, the first punching sheets 130 are stacked to form a first punching sheet group, the second punching sheets 140 are stacked to form a second punching sheet group, and the first punching sheet group and the second punching sheet group are stacked alternately to form the rotor core 100, so that the first protrusions 1311 of the adjacent first ring piece 131 can be overlapped, and the first punching sheet group and the second punching sheet group are not overlapped, which is not described in detail again.

Referring to fig. 7, in an embodiment, the first punching sheets 130 are disposed at two ends of the rotor core 100 in the axial direction, and the second punching sheets 140 are disposed at a middle portion of the rotor core 100, that is, the second punching sheets 140 are located between the first punching sheets 130 at the two ends of the rotor core 100.

Each first ring piece 131 is provided with 10 first protrusions 1311, the first protrusions 1311 are uniformly distributed on the outer side of the first ring piece 131, fig. 7 is a schematic structural view showing that the first ring piece 131 and the second ring piece 141 are stacked, and fig. 7 omits the structure of the outer core 120.

Referring to fig. 7, it can be understood that a plurality of first punching sheets 130 are stacked on one another to form first punching sheet groups, the first punching sheet groups are respectively located at two ends of the rotor core 100 along the axial direction, a plurality of second punching sheets 140 are stacked on one another to form second punching sheet groups, and the second punching sheet groups are stacked between the two first punching sheet groups, so as to form the rotor core 100. As shown in fig. 7, the outer side of the inner core 110 has only the first protrusions 1311 at both ends, the middle part does not have the first protrusions 1311, the middle part does not overlap with the protrusion parts at the upper and lower ends, that is, the first protrusions 1311 only cover the local part outside the inner core 110, thereby reducing the protrusion structure of the inner core 110, further playing a role in reducing magnetic leakage, further reducing the self-link magnetic leakage of the permanent magnet 200, facilitating the improvement of the magnetic performance of the motor, and ensuring the reliability of the operation of the motor.

It should be noted that, under the condition that the inner core 110 and the injection molded body 300 are bonded with sufficient strength, the smaller the number of the first protrusions 1311 is, the better the effect of reducing magnetic leakage is, so that the overall strength of the rotor assembly 1000 can be improved, the magnetic leakage can be further reduced, the magnetic performance of the motor can be improved, and the cost is lower.

It can be understood that the number of the first protrusions 1311 outside the inner core 110 is the same as that of the permanent magnets 200, and in the radial direction of the rotor core 100, the first protrusions 1311 are opposite to the receiving grooves 170, so that the symmetry of the magnetic circuit of the motor can be ensured, and the influence of the back electromotive force can be reduced; and the permanent magnet 200 can be separated from the first protrusion 1311 when being assembled in the accommodating groove 170, and the injection molded body 300 is filled between the permanent magnet 200 and the inner core 110, so that the insulation requirement is satisfied.

Referring to fig. 1 and 2, in some embodiments, the first and

second segments

132 and 142 are respectively provided with a second protrusion 121 along the inner side of the rotor core 100 in the radial direction, and the second protrusion 121 is used for positioning the permanent magnet 200. It can be understood that the permanent magnet 200 is assembled in the receiving groove 170, the second protrusion 121 extends toward the receiving groove 170, the second protrusion 121 can be understood to protrude to form a protruding structure inside the first segment 132 and the second segment 142, the end of the permanent magnet 200 can be supported by the second protrusion 121, the permanent magnet 200 can be positioned when the injection molded body 300 is filled, the offset of the permanent magnet 200 in the receiving groove 170 is reduced, and the stability and reliability are improved. In addition, since the second protrusion 121 protrudes from the inner side of the outer core 120, the injection molded body 300 can cover the second protrusion 121, that is, the second protrusion 121 can be embedded into the injection molded body 300, which is beneficial to improving the bonding strength between the outer core 120 and the injection molded body 300.

It should be noted that the number of the second protrusions 121 on the first segment 132 and the second segment 142 is the same, and the number of the second protrusions 121 along the circumferential direction of the rotor core 100 is the same as the number of the rotor poles. It can be understood that the first protrusions 1311 face the receiving grooves 170, and the second protrusions 121 and the first protrusions 1311 are alternately distributed in the circumferential direction of the rotor core 100, so that the first protrusions 1311 and the second protrusions 121 do not correspond in the radial direction, and the first protrusions 1311 and the second protrusions 121 can be separated to form insulation, so that the first protrusions 1311 and the second protrusions 121 can be embedded into the injection molded body 300, and the bonding force between the inner core 110, the outer core 120, and the injection molded body 300 is increased, thereby effectively improving the overall strength of the rotor core 100.

Referring to fig. 8, in the above embodiment, the second protrusion 121 includes the first extension 1211 and the second extension 1212, and the first extension 1211 and the second extension 1212 respectively extend along the circumferential direction of the rotor core 100, so that the first extension 1211 and the second extension 1212 are respectively located corresponding to the adjacent permanent magnets 200. As shown in fig. 8, taking the first segment 132 as an example, the first extension 1211 and the second extension 1212 are both disposed at the end of the first segment 132 and symmetrically distributed along the radial direction of the rotor core 100, and as shown in fig. 8, the first extension 1211 extends along the counterclockwise direction of the first ring segment 131, and the second extension 1212 extends along the clockwise direction of the first ring segment 131. It can be understood that a receiving slot 170 is formed between two adjacent first segments 132, wherein the first extension 1211 on one first segment 132 cooperates with the second extension 1212 on the other first segment 132 to position the permanent magnet 200 of the receiving slot 170, so that the structure is stable and reliable.

It should be noted that the first extension 1211 and the second extension 1212 both extend along the circumferential direction of the rotor core 100, and in the radial direction of the rotor core 100, the distance between the second protrusion 121 and the inner core 110 can be understood as the distance between the first extension 1211 and the second extension 1212 and the inner core 110.

Referring to fig. 8, in the embodiment, a radial distance between the second protrusion 121 and the inner core 110 along the rotor core 100 is L1, and L1 is equal to or greater than 1.5mm and equal to or less than 2mm, so that the design is more reasonable, and reliable insulation performance between the outer core 120 and the inner core 110 is ensured.

It can be understood that if the distance L1 between the second protrusion 121 and the inner core 110 is too small, the insulation performance between the inner core 110 and the outer core 120 may be reduced, and if L2 is too large, the coupling force between the inner core 110 and the outer core 120 and the injection molded body 300 may be reduced, so that the structural strength of the rotor assembly 1000 may be reduced, and the performance of the motor may be affected.

Referring to fig. 8, in the embodiment, the first extension 1211 and the second extension 1212 are both formed by protruding along the circumferential direction of the rotor core 100, and the protruding heights of the first extension 1211 and the second extension 1212 are equal, and the height L2 satisfies that L2 is not greater than 1mm, so that magnetic leakage caused by excessive protruding height is avoided, and magnetic leakage at the position of the second protrusion 121 is effectively reduced.

Referring to fig. 9 and 10, in some embodiments, the second protrusion 121 includes a first extension 1211, a second extension 1212, and a third protrusion 125, the third protrusion 125 being disposed between the first extension 1211 and the second extension 1212.

Specifically, the first extension 1211 and the second extension 1212 each extend in the circumferential direction of the rotor core 100 and are symmetrically distributed in the radial direction of the rotor core 100. The third projection 125 extends toward the inner core 110 in the radial direction of the rotor core 100. The specific structures of the first extension 1211 and the second extension 1212 can be seen in the embodiment shown in fig. 7, and are not described herein again.

Taking the first punching sheet 130 as an example for explanation, and fig. 9 is a schematic structural diagram of the first punching sheet 130, it can be understood that a certain gap is formed between the third protrusion 125 and the inner core 110, so as to ensure insulation between the outer core 120 and the inner core 110. The second protrusion 121 extends towards the inner core 110 by increasing the third protrusion 125, so that the contact between the second protrusion 121 and the injection molded body 300 is tighter, the bonding force between the outer core 120 and the injection molded body 300 is effectively improved, the structural strength is further improved, the overall strength of the rotor assembly 1000 is higher, and the stability of the rotor assembly 1000 in outputting large torque is improved.

Referring to fig. 10, specifically, a third extending section 1251 and a fourth extending section 1252 are provided at the end of the third protrusion 125, and the third extending section 1251 and the fourth extending section 1252 are symmetrically distributed along the radial direction of the rotor core 100.

It can be understood that, at the inner end of the third protrusion 125 formed protruding from the first segment 132, the third extension 1251 and the fourth extension 1252 respectively extend along the circumferential direction of the rotor core 100, so as to further improve the bonding force between the third protrusion 125 and the injection molded body 300, and to make the bonding between the outer core 120 and the injection molded body 300 more reliable and structurally stronger.

It should be noted that, in the embodiment shown in fig. 10, the third extending section 1251 and the fourth extending section 1252 cooperate with the third protrusion 125 to form a Y-shaped structure, it can be understood that the injection molded body 300 is filled between the inner core 110 and the outer core 120, and the injection molded body 300 can completely cover the Y-shaped structure, that is, the Y-shaped structure can be completely embedded into the injection molded body 300, so that the connection between the outer core 120 and the injection molded body 300 is more tight and firm, and the combination between the outer core 120 and the injection molded body 300 in the radial direction and the circumferential direction is ensured to be strengthened, thereby greatly improving the overall strength of the rotor assembly 1000, and the rotor assembly 1000 has higher stability when outputting a large torque. Of course, the shapes formed by the third and

fourth extension pieces

1251 and 1252 and the third protrusion 125 are not limited to the above examples, and may be T-shaped or other shapes.

Referring to fig. 1, 12 and 13, in some embodiments, the outer core 120 is provided with a first through hole 123 along the axial direction of the rotor core 100, and the first through hole 123 penetrates through the first punching sheet 130 and the second punching sheet 140, it can be understood that the outer core 120 includes a plurality of outer core units 150 arranged around, each outer core unit 150 is provided with the first through hole 123, and the first through hole 123 penetrates through the outer core unit 150 along the axial direction of the rotor core 100, that is, the first through hole 123 penetrates through each of the first segment 132 and the second segment 142.

During injection molding, a non-magnetic material is injected into each of the first through holes 123 so that the injection molded body 300 can be filled into each of the first through holes 123, such that the injection molded body 300 is simultaneously filled between the outer core 120 and the inner core 110 and in the respective first through holes 123 of the outer core 120.

It can be understood that the injection molded body 300 can cover the permanent magnet 200 and a part of the rotor core 100 at two axial ends of the rotor core 100, so that the rotor assembly 1000 is composed of the outer core 120, the inner core 110 and the permanent magnet 200, and thus, on the premise of ensuring the structural strength, the leakage flux between the outer core 120 and the inner core 110 is reduced, and the power density of the motor is improved.

It should be noted that the first through hole 123 is not limited to a circle, and may also be a polygon, for example, as shown in the schematic structural diagram of the first segment 132 shown in fig. 9, and the shape of the first through hole 123 is a triangle, it can be understood that the injection molding body 300 is filled in the first through hole 123, and the triangular injection molding body 300 has higher strength, which is beneficial to improving the structural strength of the outer core 120, and is more practical and reliable.

It should be noted that, in an embodiment, as shown in fig. 1 and 2, in the radial direction of the rotor core 100, the outer sides of the adjacent outer core units 150 are disconnected, fourth protrusions 122 are respectively disposed on the outer sides of the first segment 132 and the second segment 142, and the outer sides of the permanent magnets 200 are positioned by the fourth protrusions 122, so that the structural strength is further improved. Considering that the accommodating groove 170 is located at the outer side of the outer core 120 and has an open structure, the injection molded body 300 covers the exposed permanent magnet 200 at the outer side of the rotor core 100, so that the injection molded body 300 can completely cover the permanent magnet 200, the magnetic flux leakage is effectively reduced, and the structure is more reliable.

Referring to fig. 11, in an embodiment, the rotor core 100 further includes a third punching sheet 160, the third punching sheet 160 includes a third ring-shaped sheet and a plurality of third fan-shaped sheets 161, the plurality of third fan-shaped sheets 161 are spaced around the third ring-shaped sheet, and adjacent third fan-shaped sheets 161 are connected at a position outside the rotor core 100 in the radial direction to form a magnetic bridge, which may be understood as an outer magnetic bridge 1611 of the rotor core 100, where the third ring-shaped sheet has the same structure as the first ring-shaped sheet 131 or the second ring-shaped sheet 141, and will not be described herein again. In the embodiment, the third punching sheets 160 are stacked at both ends of the rotor core 100 in the axial direction, and the third segment 161, the first segment 132, and the second segment 142 are stacked to form the outer core 120, so that the connection through the outer bridges 1611 can be beneficial to improving the strength of the outer core 120.

Referring to fig. 4, 5, 12 and 13, the first positioning groove 1312 is formed on the inner side of the first ring piece 131, and the second positioning groove 1411 is formed on the inner side of the second ring piece 141. It can be understood that when the first ring piece 131 and the second ring piece 141 are stacked, the first positioning groove 1312 and the second positioning groove 1411 correspond in the axial direction of the rotor core 100, and the first positioning groove 1312 and the second positioning groove 1411 cooperate to position the first ring piece 131 and the second ring piece 141.

In addition, the outer core 120 is provided with a second through hole 124 along the axial direction of the rotor core 100, and the second through hole 124 penetrates through the first punching sheet 130 and the second punching sheet 140. Each outer core unit 150 is provided with a second through hole 124, the second through hole 124 penetrates through the outer core unit 150 along the axial direction of the rotor core 100, and the second through hole 124 is used for positioning the first punching sheet 130 and the second punching sheet 140.

Specifically, during the injection molding process, the injection mold cooperates with the second positioning groove 1411 through the first positioning groove 1312 to position the first ring loop piece 131 and the second ring loop piece 141, and positions the first punching piece 130 and the second punching piece 140 through the second through hole 124.

For example, a first positioning pin (not shown in the drawings) on the injection mold is inserted into the shaft hole 111, and the first positioning pin positions the first positioning groove 1312 and the second positioning groove 1411 to enable the first ring piece 131 and the second ring piece 141 to be stacked correspondingly; meanwhile, the second positioning pin (not shown in the drawing) is inserted into the second through hole 124, so that the first fan-shaped piece 132 and the second fan-shaped piece 142 are positioned simultaneously, the positioning is more stable and reliable, then the injection molding operation is performed, and the first positioning pin and the second positioning pin are pulled out after the injection molding is completed, so that the structure is simple and practical.

It should be noted that, referring to fig. 8, the second through hole 124 includes a rectangular hole 1241 and a circular hole 1242, the center of the rectangular hole 1241 coincides with the circular shape of the circular hole 1242, in an embodiment, the diameter of the circular hole 1242 is greater than the width of the rectangular hole 1241, so that the rectangular hole 1241 coincides with the circular hole 1242, and thus, during the injection molding, the second through hole 124 may be inserted into a rectangular positioning pin or a cylindrical balance pin.

Particularly, injection mold includes mould and lower mould, the lower mould has the cavity, be equipped with first locating pin and second locating pin in the cavity, with first towards piece 130, the second is placed in the cavity towards piece 140 and permanent magnet 200, wherein, first locating pin corresponds with shaft hole 111, the second locating pin is the cuboid and corresponds with the rectangle hole position 1241 of second through-hole 124, it is provided with columniform balanced nail to go up the mould, when going up the mould and moulding plastics with the lower mould lock, balanced nail corresponds and inserts in the circular hole position 1242 of second through-hole 124, thereby fix a position first scallop 132 and second scallop 142 through second locating pin and balanced nail cooperation. Because the balance nail does not coincide with the second positioning pin completely along the axial direction, when the second positioning pin is pulled out, the second positioning pin and the outer iron core 120 can be separated conveniently and rapidly, and rapid demoulding is realized. It should be noted that the shape of the second through hole 124 is not limited to the rectangular hole 1241 matching with the circular hole 1242, and the rectangular hole 1241 may also be a triangular hole, a square hole or other polygonal holes, which will not be described in detail.

Referring to fig. 2, 3, 4 and 5, each of the first fan-shaped sheets 132 and each of the second fan-shaped sheets 142 are provided with 3 first riveting points 151, respectively, and each of the first ring loop sheets 131 and each of the second ring loop sheets 141 are provided with 5 second riveting points 112, respectively. When the first punching sheet 130 and the second punching sheet 140 are stacked, the adjacent fan-shaped sheets are connected through the first riveting point 151, and the adjacent ring sheets are connected through the second riveting point 112, so that the stability of the overall structure of the rotor core 100 is further improved.

The embodiment of the present invention further provides a motor, which includes a stator and the rotor assembly 1000 shown in the above embodiment, as shown in fig. 14, a rotating shaft 2000 is connected with an inner core 110 through a shaft hole 111 to form a rotor, the rotor and the stator are assembled into a housing of the motor, bearings are respectively disposed at two ends of the rotating shaft 2000, and the structures of the stator, the housing, the bearings, and other components are not shown in the drawings. Since the motor adopts all technical solutions of the rotor assembly 1000 shown in the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is provided herein.

The embodiment of the invention also provides a household appliance (not shown in the attached drawing), wherein the household appliance can be an air conditioner, a refrigerator and the like, and the motor adopted by the household appliance is the motor of the embodiment. Since the household appliance adopts all technical solutions of the motor of the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. A rotor assembly, comprising:

the permanent magnet is arranged in the accommodating groove;

wherein, outer iron core includes around a plurality of outer iron core units that interior iron core interval set up, adjacent form between the outer iron core unit the holding tank, interior iron core includes along first ring piece and the second ring piece that rotor core's axial is range upon range of, the periphery of first ring piece is along for the periphery of second ring piece is formed with a plurality of first archs, and is a plurality of along outside protrusion first protruding edge the circumference interval distribution of first ring piece.

2. The rotor assembly of claim 1, wherein the second annular ring sheet is an annular base sheet, and the first annular ring sheet is composed of the annular base sheet and a plurality of first protrusions distributed at intervals along the circumference of the annular base sheet.

3. The rotor assembly of claim 1 wherein the first and second annular ring segments alternate in an axial direction of the rotor core.

4. The rotor assembly according to claim 1, wherein the first ring pieces are disposed at both ends of the inner core in an axial direction of the rotor core, and the second ring pieces are disposed between the first ring pieces at both ends of the inner core.

5. The rotor assembly of claim 1, wherein the first protrusions are in one-to-one correspondence with the permanent magnets and are arranged at intervals, and the injection molding body is filled between the first protrusions and the permanent magnets.

6. The rotor assembly according to claim 1, wherein each of the outer core units includes a plurality of segments stacked in an axial direction of the rotor core, and the segments are provided with second protrusions for positioning the permanent magnets toward an inner side in the inner core direction.

7. The rotor assembly of claim 6 wherein the second protrusion comprises a first extension extending along a circumference of the rotor core and a second extension extending along the circumference of the rotor core and in a direction away from the first extension.

8. The rotor assembly of claim 7 wherein the second protrusion further comprises a third protrusion disposed between the first extension and the second extension and extending in a direction toward the inner core.

9. The rotor assembly of claim 8 wherein the end of the third protrusion is provided with a third extension extending along the circumference of the rotor core and a fourth extension extending along the circumference of the rotor core and in a direction away from the third extension.

10. The rotor assembly of claim 7, wherein a distance between the second protrusion and the inner core along the radial direction of the rotor core is L1, and 1.5mm ≤ L1 ≤ 2mm is satisfied.

11. The rotor assembly of claim 7, wherein the first protrusion and the second protrusion have a height L2 along the circumferential direction of the rotor core, and L2 ≦ 1mm.

12. The rotor assembly according to claim 1, wherein the first ring piece is provided with a first positioning groove on an inner side thereof, and the second ring piece is provided with a second positioning groove on an inner side thereof, the first positioning groove and the second positioning groove corresponding to each other in an axial direction of the rotor core for positioning the first ring piece and the second ring piece.

13. The rotor assembly as claimed in claim 6, wherein outer sides of the adjacent segments are connected at both ends of the outer core in an axial direction of the rotor core.

14. The rotor assembly according to claim 1, wherein each outer core unit is provided with a first through hole which penetrates through the corresponding outer core unit in the axial direction of the rotor core, and the injection molding body is filled in the first through hole.

15. The rotor assembly of claim 1 wherein each of the outer core units is provided with a second through hole passing through the corresponding outer core unit in an axial direction of the rotor core for positioning the corresponding outer core unit.

16. The rotor assembly of claim 15 wherein the second through-hole comprises a polygonal hole location and a circular hole location, a center of the polygonal hole location coinciding with a center of the circular hole location.

17. An electrical machine comprising a rotor assembly as claimed in any one of claims 1 to 16.

18. A household appliance comprising an electric machine according to claim 17.