CN215601110U - Rotor subassembly, motor and electrical equipment - Google Patents

Abstract

The utility model discloses a rotor assembly, a motor and electrical equipment, wherein the rotor assembly comprises a rotor core and a permanent magnet, the rotor core is provided with a shaft hole for mounting a rotating shaft and a plurality of accommodating grooves distributed at intervals around the shaft hole; the permanent magnet is arranged in the accommodating groove; the plastic-coated body is wrapped on the rotor core and provided with a first end part and a second end part, and the first end part and the second end part respectively cover two ends of the permanent magnet along the axial direction of the rotor core; the inner side wall of the through hole of the first end portion and the inner side wall of the through hole of the second end portion are provided with a plurality of bulges distributed at intervals along the circumferential direction, and the bulges can correspond to the permanent magnet in the radial direction, so that the radial thickness of the plastic-coated body at the position covering the permanent magnet is increased, the improvement of the quality of the plastic-coated body after molding is facilitated, the structural strength of the rotor assembly is effectively increased, the problem that the plastic-coated body is prone to cracking can be solved, and the service life of the motor is prolonged.

Description

Rotor subassembly, motor and electrical equipment

Technical Field

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

Background

With the wider application scenes of products such as household appliances carrying motors, the diversity of the application environments of the motors is increased. Therefore, the reliability of the motor in operation in a harsh environment should be more concerned in the motor design process.

In the related art, the built-in motor rotor integrates the magnet and the rotor core into a whole through the plastic-coated body, in order to ensure that the motor has better performance, the magnet protrudes out of the end part of the rotor core along the axial direction of the rotor core, so that the thickness covered by the plastic-coated body is not uniform, the plastic-coated body is easy to crack in the using process, the stability of the rotor structure is reduced, and the service life of the motor is further reduced.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the rotor assembly provided by the utility model can improve the structural strength of the plastic-coated body, effectively solves the problem that the plastic-coated body is easy to crack, and is higher in reliability.

The utility model also provides a motor and electrical equipment comprising the rotor assembly.

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

the rotor core is provided with a shaft hole for mounting a rotating shaft and a plurality of accommodating grooves distributed at intervals around the shaft hole;

the permanent magnets are arranged in the accommodating groove;

the plastic-coated body is wrapped on the rotor core and provided with a first end part and a second end part, and the first end part and the second end part respectively cover two ends of the permanent magnet along the axial direction of the rotor core;

wherein, first end with the second end do not be equipped with the through-hole that the shaft hole corresponds, the inside wall of through-hole is equipped with the edge a plurality of archs of rotor core's the even interval distribution of circumference are followed rotor core's radially, protruding with the position of permanent magnet corresponds.

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

the first end part and the second end part are respectively arranged at two ends of the rotor core along the axial direction, the first end part and the second end part can cover two ends of the permanent magnet, and the plastic-coated body can wrap the permanent magnet and the rotor core into an integral structure, so that the permanent magnet is arranged in the rotor core; and the inside wall in the through-hole of first end and second end sets up a plurality of archs along the even interval distribution of circumference, and the position of arch and permanent magnet can correspond on radial direction for the package is moulded the body and is obtained the increase at the radial thickness that covers the position of permanent magnet, is favorable to improving the quality after the package is moulded the body shaping, effectively increases the structural strength of rotor subassembly, can solve the problem that the package is moulded the body and is easily cracked, thereby be favorable to improving the life of motor.

According to some embodiments of the utility model, the through hole is located on a cross section in a radial direction of the rotor core, the protrusion and the permanent magnet are axially symmetric, and a central axis of the protrusion coincides with a central axis of the permanent magnet.

According to some embodiments of the utility model, a groove is formed between adjacent protrusions, and in a radial direction of the rotor core, adjacent permanent magnets are axisymmetric, the groove is axisymmetric, and a central axis of the groove coincides with a central axis between adjacent permanent magnets.

According to some embodiments of the present invention, end faces of the first end portion and the second end portion are respectively provided with a reinforcing rib extending in a circumferential direction of the rotor core, the reinforcing rib being provided around the through hole.

According to some embodiments of the utility model, a width L of the reinforcing rib along a radial direction of the rotor core satisfies that L is greater than or equal to 1.5 mm.

According to some embodiments of the utility model, the protrusions and the grooves are provided with draft angles along a wall surface in a radial direction of the rotor core.

According to some embodiments of the utility model, the end faces of the first end portion and the second end portion are each provided with a plurality of stress relief holes, the plurality of stress relief holes being arranged around the through hole.

According to some embodiments of the present invention, the plastic-covered body further includes a first connecting portion and a second connecting portion for connecting the first end portion and the second end portion, the first connecting portion is disposed on an inner side surface of the receiving groove along a radial direction of the rotor core, and the second connecting portion is disposed on an outer side surface of the receiving groove along the radial direction of the rotor core.

According to some embodiments of the utility model, the first end portion, the second end portion, the first connecting portion and the second connecting portion are integrally injection molded.

According to some embodiments of the present invention, the rotor core includes a collar portion and a plurality of fan-shaped portions disposed around the collar portion at intervals and connected to the collar portion, the shaft hole is disposed at a central position of the collar portion, the accommodating groove is formed between adjacent fan-shaped portions, and the collar portion is provided with a positioning protrusion portion for positioning the permanent magnet along a radial outer side wall of the rotor core.

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

The motor provided by the embodiment of the utility model has at least the following beneficial effects:

the motor adopts the rotor subassembly of above-mentioned embodiment, can increase the radial thickness of plastic-coated body in the position that covers the permanent magnet, is favorable to improving the quality behind the plastic-coated body shaping to increase the structural strength of rotor subassembly, can solve the problem that plastic-coated body is easy to split, can obviously improve the motor and be favorable to improving the life of motor at severe temperature environment operating mode.

The electric appliance according to the third aspect embodiment of the present invention includes the motor according to the second aspect embodiment.

The electrical equipment adopts all the technical schemes of the motor of the embodiment, so that the electrical equipment at least has all the beneficial effects brought by the technical schemes of the embodiment.

Additional features and advantages of the utility model 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 utility model.

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 an exploded view of a rotor assembly in accordance with an embodiment of the present invention;

FIG. 2 is a schematic view of an assembled structure of a rotor assembly according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an overmolded body according to an embodiment of the utility model;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 3;

fig. 5 is a schematic structural diagram of a rotor core according to an embodiment of the present invention.

Reference numerals:

a rotor assembly 1000;

a rotor core 100; a sector 110; a through hole 111; a collar portion 120; a shaft hole 121; the positioning boss 122; an accommodating groove 130; an inner magnetic bridge 140;

a permanent magnet 200;

an overmolded body 300; a first end portion 310; a magnet cover 311; an end face covering portion 312; a second end portion 320; a through-hole 330; a projection 331; a groove 332; a first connection portion 340; a second connection portion 350; a reinforcing rib 360; a stress release hole 370; a positioning hole 380;

a rotating shaft 400.

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 is any description of "first", "second", etc. for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the description of the present invention, it is to be understood that the terms "axial," "radial," "circumferential," and the like refer to an orientation or positional relationship based on that shown in the drawings, which is for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention.

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 5. The rotor assembly 1000 is described below with a specific example.

Referring to fig. 1 and 2, 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 is provided with a shaft hole 121 and a plurality of receiving grooves 130, the shaft hole 121 is disposed at a central position of the rotor core 100, the plurality of receiving grooves 130 are distributed at equal intervals around the shaft hole 121, the receiving grooves 130 are disposed at intervals between the shaft hole 121 and the shaft hole 121, a rotating shaft 400 is installed in the shaft hole 121, and one permanent magnet 200 is installed in each receiving groove 130, so that the permanent magnets 200 can be uniformly arranged along a circumferential direction of the rotor core 100, a plastic-coated body 300 is disposed on the rotor core 100, and the permanent magnets 200 and the rotor core 100 are coated by the plastic-coated body 300 to form an integrated structure.

Referring to fig. 2, specifically, permanent magnets 200 penetrate rotor core 100 in the axial direction of rotor core 100, and both ends of permanent magnets 200 protrude from both ends of rotor core 100 in the axial direction. The insulating material is wrapped outside the rotor core 100 by injection molding to form a plastic-wrapped body 300, the plastic-wrapped body 300 is provided with a first end portion 310 and a second end portion 320, the first end portion 310 is located at one end of the rotor core 100 along the axial direction, the second end portion 320 is located at the other end of the rotor core 100 along the axial direction, and the first end portion 310 and the second end portion 320 are located at two ends of the rotor core 100 respectively.

It can be understood that, in the axial direction of rotor core 100 in the embodiment, the length of permanent magnet 200 is greater than the length of rotor core 100, so that permanent magnet 200 can protrude from both ends of rotor core 100, and a relatively saturated magnetic field is generated in rotor core 100, which is beneficial to improving the magnetic density on rotor core 100, and further improving the power density of the motor, so as to improve the performance efficiency of the motor. As shown in fig. 2, the first end portion 310 and the second end portion 320 can cover at least two ends of the permanent magnet 200 at the end position of the rotor core 100, so that the permanent magnet 200 is fixed and the structure is stable and reliable.

It should be noted that, in the embodiment shown in fig. 2, the plastic-coated body 300 covers partial positions of both ends of the rotor core 100 in the axial direction, that is, neither the first end portion 310 nor the second end portion 320 completely covers end faces of both ends of the rotor core 100, and the partial positions of the end faces of both ends of the rotor core 100 are exposed, which is beneficial to reducing the material used for the plastic-coated body 300 under the condition of ensuring the structural stability. Of course, the first end portion 310 and the second end portion 320 may completely cover the end surfaces of the two ends of the rotor core 100, and detailed description thereof is omitted.

Referring to fig. 2, since the first end portion 310 and the second end portion 320 respectively cover the end surfaces of the rotor core 100, in order to avoid the rotating shaft 400, the plastic-covered body 300 is provided with through holes 330 respectively at the first end portion 310 and the second end portion 320, and the through holes 330 correspond to the shaft holes 121 in the axial direction of the rotor core 100. When the rotating shaft 400 is fitted into the shaft hole 121, both ends of the rotating shaft 400 pass through the through holes 330 of the first end portion 310 and the second end portion 320, respectively.

It can be understood that, since the permanent magnets 200 are spaced apart from each other in the circumferential direction of the rotor core 100 and protrude from the end surface of the rotor core 100, the end of each permanent magnet 200 is covered with the plastic-covered body 300, and the through-hole 330 is formed at the center of the plastic-covered body 300. In the radial direction of rotor core 100, the thickness of plastic-covered body 300 at the position of permanent magnet 200 is small relative to the thickness at other positions. Specifically, the plastic-coated body 300 has a smaller thickness in the radial direction at a position between the permanent magnet 200 and the through-hole 330, and a larger thickness in the radial direction at a position between the adjacent permanent magnets 200. Based on the above structure, in the embodiment, the plurality of protrusions 331 are added on the inner side wall of the through hole 330, and the plurality of protrusions 331 are distributed at intervals along the circumferential direction of the rotor core 100, so that the position of each protrusion 331 can correspond to the position of the permanent magnet 200 in the radial direction of the rotor core 100 one by one, and thus the thickness of the plastic-coated body 300 at the position between the permanent magnet 200 and the through hole 330 can be increased, thereby facilitating the improvement of the strength of the plastic-coated body 300, further improving the quality of the plastic-coated body 300 after molding, effectively solving the problem that the plastic-coated body 300 is easy to crack at the position with smaller radial thickness, and improving the reliability of the motor.

Referring to fig. 3 and 4, taking the first end portion 310 of the plastic covered body 300 as an example, the first end portion 310 includes a magnet covering portion 311 covering the end surface of the permanent magnet 200 and an end surface covering portion 312 formed around the shaft hole 121, the plurality of magnet covering portions 311 are spaced around the end surface covering portion 312, the magnet covering portions 311 extend outward in the radial direction of the rotor core 100, the magnet covering portions 311 are connected to the end surface covering portion 312 in a radial shape, and the through hole 330 is formed in the center position of the end surface covering portion 312.

It can be understood that, in the radial direction of the rotor core 100, the thickness of the position where the end surface covering portion 312 corresponds to the magnet covering portion 311 is relatively thin, and by providing the protrusions 331 at the positions corresponding to the magnet covering portions 311 on the inner side walls of the through holes 330, the protrusions 331 correspond to the magnet covering portions 311 one-to-one, so that the thickness of the position where the end surface covering portion 312 is relatively thin is increased, thereby improving the strength of the first end portion 310, and effectively solving the problem that the end surface covering portion 312 is prone to crack at the position where the thickness is relatively thin.

It should be noted that, in the embodiment, the second end portion 320 and the first end portion 310 are symmetrically disposed on two end surfaces of the rotor core 100, and have the same structure, and for a specific structure of the second end portion 320, reference may be made to the structure of the first end portion 310 in the above embodiment, and details are not described here again.

In the embodiment, the permanent magnet 200 is a rectangular parallelepiped, the permanent magnet 200 may be a ferrite sintered magnet or a neodymium magnet, and the accommodating groove 130 is matched with the permanent magnet 200. The plastic-covered body 300 may also be further filled in the gap between the permanent magnet 200 and the rotor core 100, so that the permanent magnet 200 and the rotor core 100 are more stably and reliably combined, and in the embodiment, the plastic-covered body 300 may be made of a resin material, which is not particularly limited.

Referring to fig. 2 and 3, in some embodiments, the number of the receiving slots 130 of the rotor core 100 is 10, the number of the permanent magnets 200 is 10, and the number of the protrusions 331 on the inner sidewall of the through-hole 330 is also 10. It can be understood that, in the cross section where each through hole 330 is located, the protrusions 331 are arranged in an axisymmetric manner, and the permanent magnets 200 are also arranged in an axisymmetric manner, so that the protrusions 331 can be in one-to-one correspondence with the permanent magnets 200 in the radial direction, and the radial thickness of the plastic-covered body 300 corresponding to each permanent magnet 200 is ensured to be increased.

It should be noted that, on the cross section of the through hole 330, along the radial direction of the rotor core 100, the protrusions 331 are distributed in an axisymmetric manner and have axisymmetric central axes; the permanent magnets 200 are distributed in an axisymmetric manner and have axisymmetric central axes, and the axisymmetric central axes of the protrusions 331 coincide with the axisymmetric central axes of the permanent magnets 200, so that the protrusions 331 and the permanent magnets 200 are uniformly distributed, the quality of the plastic-coated body 300 after injection molding is effectively improved, and the reliability of the structure is ensured.

It can be understood that, since the protrusions 331 are convexly formed at the inner sidewalls of the through-holes 330, positions between the adjacent protrusions 331 are concavely formed with respect to each other, thereby forming the grooves 332. In the radial direction of the rotor core 100, the position of the groove 332 corresponds to the position between the adjacent permanent magnets 200, the adjacent permanent magnets 200 are axisymmetrical, and the groove 332 is axisymmetrical such that the central axis of the groove 200 coincides with the central axis between the adjacent permanent magnets 200. That is, the protrusion 331 is corresponding to the permanent magnet 200 in a direction radially away from the through-hole 330, and the recess 332 is not corresponding to the permanent magnet 200 in a position radially away from the through-hole 330. In this way, the protrusions 331 and the grooves 332 are circumferentially spaced, so that the radial thickness distribution of the end surface covering part 312 is more uniform, the shrinkage of the injection molding material is more uniform when the environmental temperature of the end surface covering part 312 with uniform thickness changes, and further the cracking of the injection molding body 300 can be avoided.

Referring to fig. 3 and 4, it should be noted that, in the embodiment, the surface of the protrusion 331 is arc-shaped, and the protrusion 331 and the groove 332 are in transitional connection through an arc surface, so that the cross section of the inner side wall of the through hole 330 is approximately petal-shaped, and thus the thickness distribution of the end surface covering portion 312 in the radial direction is more uniform, the quality of the plastic covered body 300 after injection molding is better, and the structural strength is higher. The protrusion 331 and the groove 332 are integrally formed with the plastic-covered body 300 by injection molding, which is more stable and reliable, and the radial height of the protrusion 331 and the groove 332 is set according to the strength requirement of the actual product, and is not further limited.

Referring to fig. 3, the end surface of the first end portion 310 is provided with a rib 360, the rib 360 extends in a ring shape along the circumferential direction of the rotor core 100, the rib 360 is located on the surface of the end surface covering portion 312 and is close to the through hole 330, the strength of the end surface covering portion 312 can be improved through the rib 360, and the situation that the plastic-coated body 300 cracks in the radial direction at the position of the through hole 330 is further reduced. Of course, the end surface of the second end portion 320 is also provided with the reinforcing rib 360, which will not be described in detail.

In an embodiment, the width L of the reinforcing rib 360 in the radial direction of the rotor core 100 is greater than or equal to 1.5mm (millimeter), for example, the width L of the reinforcing rib 360 may be set to be 2mm, 3mm, 5mm, and the like, and the reinforcing rib 360 can effectively reinforce the end surface covering portion 312, thereby effectively preventing the end surface covering portion 312 from cracking in the radial direction at the position of the through hole 330. The height of the reinforcing ribs 360 in the axial direction of the rotor core 100 is set according to the application requirements of the actual product, and is not particularly limited. It should be noted that the shape of the reinforcing rib 360 is not limited to a circle, and may also be an ellipse, a square, etc., and is not described herein again.

Considering that the plastic-coated body 300 is wrapped on the rotor core 100 by injection molding, in order to facilitate separation of the plastic-coated body 300 from the mold after injection molding, a mold drawing feature is added on the surfaces of the protrusions 331 and the grooves 332 in the present embodiment. Specifically, although the protrusions 331 and the recesses 332 are provided with draft angles on the wall surfaces in the radial direction of the rotor core 100, it is also understood that the wall surfaces of the protrusions 331 and the recesses 332 are provided obliquely in the axial direction of the rotor core 100. As shown in fig. 4, along the axial direction of rotor core 100, the overall aperture of through-hole 330 is gradually increased towards the direction of keeping away from rotor core 100, and after injection molding, plastic-coated body 300 can be rapidly separated from the mold through draft, so that the stability of the overall structure of plastic-coated body 300 is not affected, and the improvement of the molding quality of plastic-coated body 300 is facilitated, and the improvement is more practical and reliable.

Referring to fig. 3, a plurality of stress releasing holes 370 are formed in an end surface of the first end portion 310, the stress releasing holes 370 are spaced around the through hole 330, each stress releasing hole 370 is spaced from the through hole 330, the stress releasing holes 370 penetrate the first end portion 310 in an axial direction of the rotor core 100, and the stress releasing holes 370 release stress of the plastic covered body 300. Meanwhile, a stress release hole 370 is also provided on an end surface of the second end portion 320, and the specific structure is shown in the embodiment shown in fig. 3. Because the plastic-coated body 300 is easy to deform due to the influence of temperature change and other factors, and then generates an interaction internal force inside the plastic-coated body 300, in the embodiment, the stress release hole 370 is formed in the plastic-coated body 300 to offset the deformation caused by the action of the internal force, so that the plastic-coated body 300 is ensured to have higher reliability and stability.

It can be understood that the stress release hole 370 is provided on the end surface covering part 312 between the adjacent magnet covering parts 311, and functions to effectively release stress without affecting the structural strength of the overmold body 300. The shape of the stress release hole 370 may be circular, oval, triangular, etc., and is not particularly limited.

In addition, in the embodiment, the positioning holes 380 are provided on the magnet covering portion 311, the positioning holes 380 penetrate through the magnet covering portion 311 in the radial direction, and the positioning components are used for positioning the permanent magnet 200 through the positioning holes 380 when the plastic covered body 300 is injection-molded, so as to ensure the stability of the combination of the permanent magnet 200 and the rotor core 100.

Referring to fig. 3, a first connecting portion 340 and a second connecting portion 350 are disposed between the first end portion 310 and the second end portion 320, in the axial direction of the rotor core 100, two ends of the first connecting portion 340 are respectively connected to the first end portion 310 and the second end portion 320, two ends of the second connecting portion 350 are respectively connected to the first end portion 310 and the second end portion 320, so that the first end portion 310 and the second end portion 320 are connected to form an integral structure, and the first end portion 310, the second end portion 320, the first connecting portion 340 and the second connecting portion 350 are integrally injection-molded, thereby improving the overall structural strength of the plastic-covered body 300.

Referring to fig. 3, the connection position of the first connection portion 340 is close to the axial center of the plastic covered body 300, and the connection position of the second connection portion 350 is far from the axial center of the plastic covered body 300, specifically, the first connection portion 340 is located on the inner side surface of the receiving groove 130 along the radial direction of the rotor core 100, and the second connection portion 350 is located on the outer side surface of the receiving groove 130 along the radial direction of the rotor core 100, as shown in fig. 2, the second connection portion 350 is exposed out of the rotor core 100, so that the plastic covered body 300 can firmly wrap the permanent magnet 200 in the rotor core 100.

Referring to fig. 1 and 5, in some embodiments, the rotor core 100 includes a collar portion 120 and a plurality of sectors 110 spaced around the collar portion 120, each sector 110 is connected to the collar portion 120, a shaft hole 121 is disposed in the center of the collar portion 120, receiving grooves 130 are formed between adjacent sectors 110, a permanent magnet 200 is assembled in each receiving groove 130, and a rotating shaft 400 is assembled in the shaft hole 121, as shown in fig. 1, for example, the rotating shaft 400 may be connected to the shaft hole 121 by an interference fit, which is not described in detail.

Referring to fig. 5, a positioning protrusion 122 is provided on an outer side wall of the collar portion 120 in the radial direction of the rotor core 100, and when the rotor core is assembled, the permanent magnet 200 abuts against the positioning protrusion, and the permanent magnet 200 can be positioned in the radial direction by the positioning protrusion 122, thereby further improving the structural stability of the permanent magnet 200.

Each segment 110 and the collar 120 are connected by the inner magnetic bridge 140, so that the rotor core 100 as a whole has high mechanical strength and high reliability. Specifically, the rotor core 100 is formed by stacking a plurality of rotor sheets in the axial direction of the rotor core 100, each rotor sheet includes a ring piece and a plurality of fan-shaped pieces arranged around the ring piece, each fan-shaped piece is connected to the ring piece, when the plurality of rotor sheets are stacked, the ring piece is stacked to form the shaft ring portion 120, and the fan-shaped pieces are stacked to form the fan-shaped portion 110, so as to obtain the rotor core 100.

Referring to fig. 5, the rotor core 100 is provided with a through hole 111 penetrating the sector 110 in the axial direction of the rotor core 100, and the through hole 111 is used for dynamic balance calibration of the rotor assembly 1000. In the embodiment shown in fig. 5, each sector 110 is provided with a through hole 111, or at least one sector 110 is provided with a through hole 111, which is not described in detail again.

The embodiment of the present invention further provides a motor, which includes a stator and a rotor, the rotor is manufactured by using the rotor assembly 1000 shown in the above embodiment, the rotor and the stator are assembled into a housing of the motor, two ends of the rotating shaft 400 are respectively provided with a bearing, one end of the rotating shaft 400 extends to the outer side of the housing to form a driving end, and the specific structure of the stator, the housing, the bearing, and other components is 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 present invention further provides an electrical apparatus (not shown in the drawings), where the electrical apparatus may be a household appliance such as an air conditioner, a refrigerator, and the like, and the motor adopted by the electrical apparatus is the motor of the above embodiment. Since the electrical equipment 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 (12)

1. A rotor assembly, comprising:

the rotor core is provided with a shaft hole for mounting a rotating shaft and a plurality of accommodating grooves distributed at intervals around the shaft hole;

the permanent magnets are arranged in the accommodating groove;

the plastic-coated body is wrapped on the rotor core and provided with a first end part and a second end part, and the first end part and the second end part respectively cover two ends of the permanent magnet along the axial direction of the rotor core;

wherein, first end with the second end do not be equipped with the through-hole that the shaft hole corresponds, the inside wall of through-hole is equipped with the edge a plurality of archs of rotor core's the even interval distribution of circumference are followed rotor core's radially, protruding with the position of permanent magnet corresponds.

2. The rotor assembly of claim 1, wherein the through hole is located on a cross section in a radial direction of the rotor core, the protrusion and the permanent magnet are axially symmetric, and a central axis of the protrusion is coincident with a central axis of the permanent magnet.

3. The rotor assembly of claim 2, wherein a groove is formed between adjacent protrusions, adjacent permanent magnets are axisymmetric in a radial direction of the rotor core, the groove is axisymmetric, and a central axis of the groove coincides with a central axis between adjacent permanent magnets.

4. The rotor assembly of claim 1 wherein the end faces of the first end portion and the second end portion are each provided with a reinforcing rib extending in the circumferential direction of the rotor core, the reinforcing ribs being provided around the through-hole.

5. The rotor assembly of claim 4, wherein the width L of the reinforcing ribs along the radial direction of the rotor core meets the condition that L is more than or equal to 1.5 mm.

6. The rotor assembly of claim 3 wherein said projections and said recesses are tapered along a radial wall of said rotor core.

7. The rotor assembly of any one of claims 1 to 6 wherein the end faces of the first and second end portions are each provided with a plurality of stress relief holes disposed around the through hole.

8. The rotor assembly of claim 1, wherein the plastic-covered body further comprises a first connecting portion and a second connecting portion for connecting the first end portion and the second end portion, the first connecting portion is disposed on an inner side surface of the receiving groove along a radial direction of the rotor core, and the second connecting portion is disposed on an outer side surface of the receiving groove along the radial direction of the rotor core.

9. The rotor assembly of claim 8 wherein the first end portion, the second end portion, the first connection portion and the second connection portion are integrally injection molded.

10. The rotor assembly of claim 1, wherein the rotor core comprises a shaft ring portion and a plurality of sectors spaced around the shaft ring portion and connected to the shaft ring portion, the shaft hole is formed in a central position of the shaft ring portion, the receiving groove is formed between adjacent sectors, and the shaft ring portion is provided with a positioning protrusion portion for positioning the permanent magnet along a radial outer side wall of the rotor core.

11. An electrical machine comprising a rotor assembly as claimed in any one of claims 1 to 10.

12. An electrical apparatus, characterized in that it comprises an electric machine according to claim 11.

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