CN117543852A - Stator assembly and motor - Google Patents

Abstract

The invention discloses a stator assembly and a motor, wherein the stator assembly comprises: the bearing sleeve forms a ring shape, and the inner side of the bearing sleeve is used for installing a bearing; the outer shell is arranged at the outer side of the bearing sleeve; the stator windings are arranged between the bearing sleeve and the shell and are arranged at equal intervals along the circumferential direction of the bearing sleeve, and the middle part of each stator winding is provided with a mounting hole; and each mounting hole is internally provided with a stator core, each stator core extends along the axial direction of the bearing, and the bearing sleeve, the shell, the stator winding and the stator core are integrally injection molded. According to the stator assembly provided by the embodiment of the invention, the stator core adopts a design without a yoke part, so that the stator assembly is small in axial thickness and volume, and further, the motor is small in axial thickness, light in weight and high in efficiency, and the design requirement of miniaturization of products can be met; and the winding process of the stator winding is simple, the mass production is convenient, the stator winding and the stator core are convenient to assemble, the integral injection molding has good structural stability, and the assembly on the motor is further convenient.

Description

Stator assembly and motor

Technical Field

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

Background

In the related art, the motor is usually a radial magnetic field motor, the stator core of the motor stator comprises a yoke portion and a stator tooth portion arranged on the inner side of the yoke portion, and the winding is wound on the stator tooth portion of the stator core, so that the motor is thicker, occupies large space, is unfavorable for miniaturization product design, and has room for improvement.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a stator assembly which has a small axial dimension, can save space, and is simple in manufacturing and assembling processes.

The invention further provides a motor.

A stator assembly according to an embodiment of the first aspect of the present invention includes: the bearing sleeve is annular, and the inner side of the bearing sleeve is used for installing a bearing; the shell is arranged on the outer side of the bearing sleeve; the stator windings are arranged between the bearing sleeve and the shell and are arranged at equal intervals along the circumferential direction of the bearing sleeve, and the middle part of each stator winding is provided with a mounting hole; the stator cores are arranged in the mounting holes, each stator core extends along the axial direction of the bearing, and the bearing sleeve, the shell, the stator winding and the stator core are integrally injection molded.

According to the stator assembly provided by the embodiment of the invention, the stator core adopts a design without a yoke part, so that the stator assembly is small in axial thickness and volume, and further, the motor is small in axial thickness, light in weight and high in efficiency, and the design requirement of miniaturization of products can be met; and the winding process of the stator winding is simple, the mass production of the low-cost stator winding is facilitated, the stator winding and the stator core are convenient to assemble, the integral injection molding structure stability is good, and the assembly on the motor is further facilitated.

According to the stator assembly provided by the embodiment of the invention, the stator winding comprises the insulating frame and the enameled wire wound on the insulating frame, the insulating frame is provided with the mounting hole, one of the insulating frame and the bearing sleeve is provided with the limit groove, the other of the insulating frame and the bearing sleeve is provided with the limit block, and the limit block is in plug-in fit with the limit groove.

According to the stator assembly provided by the embodiment of the invention, each stator core comprises the inner side edge close to the bearing sleeve and the outer side edge far away from the bearing sleeve, wherein the length of the inner side edge in the circumferential direction of the bearing sleeve is smaller than that of the outer side edge in the circumferential direction of the bearing sleeve.

In some examples, the outer side comprises a first outer section and a second outer section arranged radially symmetrically along the bearing housing, the included angle between the first outer section and the second outer section ranging between 120 ° and 170 °; and/or the end part of the stator core is provided with a rounding angle.

According to the stator assembly provided by the embodiment of the invention, the outer side of the bearing sleeve is abutted with the shell, and the inner side of the bearing sleeve is provided with the mounting convex part.

An electric machine according to an embodiment of the second aspect of the present invention includes a rotating shaft, two rotors, and a stator assembly according to an embodiment of the first aspect of the present invention, the two rotors being provided on both sides of the stator assembly in an axial direction of the rotating shaft.

According to the motor provided by the embodiment of the invention, the stator assembly is adopted, so that the axial thickness can be reduced, the motor space is small in size, light in weight and high in efficiency, the power density of the motor is high, copper, iron and permanent magnetic materials used by the motor can be reduced, and the performance of the motor is improved; meanwhile, the stator assembly has good structural stability, the rotor is convenient to assemble, and the assembly efficiency of the motor is improved; can meet the design requirement of miniaturization of products and has wide application range.

According to the motor provided by the embodiment of the invention, the shaft sleeve is sleeved on the outer side of the rotating shaft, and the shaft sleeve is arranged in the bearing sleeve through the first bearing.

According to the motor provided by the embodiment of the invention, the middle part of each rotor is provided with the boss, the shaft sleeve is clamped between the two bosses and fixedly connected with the bosses, and the bosses and the shaft sleeve are in plug-in fit with each other through the positioning column and the positioning hole.

The motor according to the embodiment of the invention further comprises: the stator assembly comprises a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively arranged at two ends of the stator assembly in the axial direction of the rotating shaft and cover the rotor, a mounting concave cavity is formed in the middle of one of the first end cover and the second end cover, a through hole for the rotating shaft to penetrate is formed in the bottom wall of the mounting concave cavity, and a second bearing matched with the rotating shaft is arranged in the mounting concave cavity.

In some examples, one of the side of the housing facing the first end cap and the first end cap has a first mating boss and the other has a first mating recess, the first mating boss and the first mating recess being a plug-fit; one of the side of the shell facing the second end cover and the second end cover is provided with a second matching lug boss, and the other side is provided with a second matching groove, and the second matching lug boss and the second matching groove are in plug-in matching.

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

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic structural view of a stator assembly according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a stator assembly according to an embodiment of the invention;

fig. 3 is a schematic structural view of a stator winding according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a stator core according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a stator core according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of a bearing housing according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a rotor according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a motor according to an embodiment of the present invention;

fig. 9 is a cross-sectional view of an electric machine according to an embodiment of the present invention.

Reference numerals:

the motor 1000 is provided with a motor,

the stator assembly 100, the clearance space 101, the rotor 200, the rotor back iron 201, the permanent magnet 202, the boss 203, the limit concave 204, the positioning column 205, the rotating shaft 300, the first end cover 400, the first matching groove 401, the second end cover 500, the second matching groove 501, the second mounting concave 502,

the housing 10, the first mating boss 11, the second mating boss 12, the lugs 13,

stator winding 20, insulating frame 21, enameled wire 22, mounting hole 23, stopper 24,

stator core 30, inner side 31, outer side 32, first outer section 321, second outer section 322,

bearing housing 40, limit groove 41, mounting boss 42,

the device comprises a shaft sleeve 50, a positioning hole 51, a first bearing 60, a second bearing 70, a clamp spring 80 and a gasket 90.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

An electric machine 1000 according to an embodiment of the present invention is described below with reference to fig. 1-9.

As shown in fig. 1 to 9, a stator assembly 100 according to an embodiment of the present invention includes: the bearing sleeve 40, the shell 10, a plurality of stator windings 20 and a plurality of stator cores 30, the bearing sleeve 40 forms the annular, the inboard of bearing sleeve 40 is used for installing the bearing, the shell 10 sets up in the outside of bearing sleeve 40, a plurality of stator windings 20 set up between bearing sleeve 40 and shell 10, a plurality of stator windings 20 are equidistant along the circumference of bearing sleeve 40, the middle part of every stator winding 20 has mounting hole 23, be equipped with a stator core 30 in every mounting hole 23, every stator core 30 extends along the axial (the upper and lower direction as shown in fig. 2) of bearing, wherein, bearing sleeve 40, shell 10, stator windings 20 and stator core 30 integrated into one piece injection moulding.

It can be appreciated that by providing a plurality of stator windings 20 and a plurality of stator cores 30, the stator cores 30 are installed in the installation holes 23 of the stator windings 20, and the stator cores 30 are of a yoke-free design, so that the thickness of the stator assembly 100 in the axial direction thereof can be reduced, thereby reducing the volume of the stator assembly 100; and the stator winding 20 can be wound in advance, and a complex winding process is not required after assembly, so that the winding process is simple, the operation is convenient, the assembly efficiency is improved, the assembly cost is reduced, and the mass production is facilitated.

Before injection molding, the stator windings 20 which are wound in advance can be directly sleeved on the stator core 30, a plurality of stator windings 20 are matched on the periphery of the bearing sleeve 40, and then the integrated injection molding is carried out through an injection molding process to form the shell 10, so that the production process of the stator assembly 100 is simple, in the injection molding process, the bearing sleeve 40 is synchronously injection molded, the fixation of the bearing sleeve 40 is realized, the production assembly process is further simplified, the fixation reliability of the bearing sleeve 40 is ensured, and the mass production of the motor 1000 is facilitated.

According to the stator assembly 100 provided by the embodiment of the invention, the stator core 30 adopts a design without a yoke part, so that the stator assembly 100 has small axial thickness and small volume, and further, the motor 1000 has small axial thickness, light weight and high efficiency, and can meet the design requirement of miniaturization of products; and the winding process of the stator winding 20 is simple, the mass production of the low-cost stator winding 20 is facilitated, the assembly of the stator winding 20 and the stator core 30 is convenient, the structural stability of integral injection molding is good, and the assembly on the motor 1000 is further facilitated.

In some embodiments, the shell 10 is a BMC material (Bulk Molding Compound ) that has excellent flow characteristics, insulation, corrosion resistance, heat resistance, and flame retardance, for example, the BMC material can withstand temperatures of 150-280 ℃, has a small shrinkage (only three parts per million to five parts per million), can be injection molded, and has a low molding temperature (120-160 ℃), so that the BMC material is suitable for various molding processes, and the shape of the shell 10 made of the BMC material can be varied, thereby being beneficial to meeting different shape requirements.

In some embodiments, the housing 10 is a resin material that is relatively low cost, which is beneficial for reducing the overall cost of the stator assembly 100.

In some specific examples, the stator winding 20, the bearing housing 40, and the stator core 30 are placed in a custom tooling, where the placement is sized to meet design requirements, and then injection molded with a BMC material to fix them together, and injection molded to form the housing 10. At the same time, when in injection molding, lugs 13 are uniformly distributed on the periphery of the shell 10, the lugs 13 are provided with motor 1000 mounting holes, and the upper end and the lower end of the shell 10 are respectively provided with a matching part which can be matched with an end cover of the motor 1000.

As shown in fig. 3, according to some embodiments of the present invention, the stator winding 20 includes an insulation frame 21 and an enamel wire 22, the enamel wire 22 is wound on the insulation frame 21 before the stator winding 20 is injection molded, a mounting hole 23 is provided in the middle of the insulation frame 21, a limiting block 24 is further provided on the insulation frame 21, and a limiting groove 41 is provided on the outer circumferential surface of the bearing sleeve 40, and of course, the limiting block 24 may also be provided on the insulation frame 21, and the limiting block 24 is provided on the bearing sleeve 40, and is in plug-fit with the limiting groove 41 through the limiting block 24, so as to achieve a positioning effect when the stator winding 20 and the bearing sleeve 40 are matched. It can be appreciated that the insulation frame 21 and the bearing sleeve 40 are matched with the limiting block 24 and the limiting groove 41, and the insulation frame and the bearing sleeve 40 can be fixed through injection molding, so that the fixing of the bearing sleeve 40 to the stator winding 20 is realized, the fixing reliability of the bearing sleeve 40 and the stator winding 20 is ensured, and the stator assembly 100 and the rotating shaft 300 and other structures can be assembled conveniently.

The limiting block 24 forms a trapezoid structure, and the limiting groove 41 is a matching trapezoid structure with a tapered opening, so that the limiting block 24 and the limiting groove 41 can be in up-down plug-in matching, and the stator winding 20 is prevented from being separated from the outer peripheral surface of the bearing sleeve 40.

In some examples, the insulating frame 21 may comprise two parallel plate-like structures connected by a connecting arm configured as an "i" structure with the two plate-like structures, and the enamel wire 22 is adapted to be wound on the connecting arm, that is, a winding slot is formed between the two plate-like structures.

As shown in fig. 4 and 5, in some examples, each stator core 30 includes an inner side 31 and an outer side 32, the inner side 31 is a side of the stator core 30 near the bearing housing 40, the outer side 32 is a side of the stator core 30 far from the bearing housing 40, wherein the length of the inner side 31 is smaller than the length of the outer side 32 in the circumferential direction of the bearing housing 40, thereby making the stator core 30 more stable in structure and improving the material utilization of the stator core 30. The inner side 31 may be a circular arc surface, a sector surface, and the outer side 32 may be a circular arc surface, a sector surface.

In some examples, the outer side 32 is a sector, the outer side 32 includes a first outer side section 321 and a second outer side section 322, and the first outer side section 321 and the second outer side section 322 are symmetrically arranged along the radial direction of the bearing housing 40, that is, the outer side 32 is provided with chamfers, thereby improving the utilization of materials and reducing the weight of the stator core 30. Wherein, the included angle between the first outer side section 321 and the second outer side section 322 is θ, and θ satisfies the relation: θ is more than or equal to 120 degrees and less than or equal to 170 degrees. For example, θ may be 120 °, 130 °, 140 °, 150 °, 160 °, 170 °, and the like.

In some embodiments of the present invention, the stator core 30 has no yoke, is in a vertical bar shape, and the end of the stator core 30 is provided with a rounded corner, as shown in fig. 5, and the upper end of the stator core 30 is rounded, so that the influence of the harmonic wave can be reduced, and of course, the lower end of the stator core 30 may be rounded to reduce the influence of the harmonic wave. The stator core 30 has a simple shape and is easy to manufacture, and the stator core 30 can be formed by compression molding of a soft magnetic composite material (for example, an SMC material), stamping of silicon steel, or coiled material processing.

As shown in fig. 2, according to some embodiments of the present invention, the outer side of the bearing housing 40 abuts against the casing 10, and the inner side of the bearing housing 40 has a mounting protrusion 42, so that the bearing housing 40 is exposed to the inner side of the casing 10, and the mounting protrusion 42 can support the bearing mounted on the inner side of the bearing housing 40, thereby realizing the limitation of the bearing in the radial and axial directions and improving the structural stability.

As shown in fig. 8 and 9, the motor 1000 according to the embodiment of the present invention includes a rotating shaft 300, a stator assembly 100, and two rotors 200, the rotating shaft 300 being disposed at a middle portion of the stator assembly 100, the two rotors 200 being disposed at both sides of the stator assembly 100 in an axial direction of the rotating shaft 300, as shown in fig. 9, the rotating shaft 300 extending in an up-down direction, the rotating shaft 300 being fixed by a bearing fixed at an inner side of the stator assembly 100, one rotor 200 being disposed at an upper side of the stator assembly 100, and the other rotor 200 being disposed at a lower side of the stator assembly 100, thereby forming a double-rotor 200 motor 1000 structure of a stator without a yoke, the motor 1000 being thin in an axial direction, saving a lot of space, the stator assembly 100 generating a rotating magnetic field and acting on the rotors 200 to form a magneto-electric rotating torque, so that the rotors 200 are rotated, and the rotating shaft 300 is fixed with the rotors 200, thereby achieving rotation of the rotating shaft 300.

According to the motor 1000 of the embodiment of the invention, by adopting the stator assembly 100, the axial thickness can be reduced, so that the motor 1000 has small space volume, light weight, high efficiency and high power density, and further, copper, iron and permanent magnetic materials used by the motor 1000 can be reduced, and the performance of the motor 1000 is improved; meanwhile, the stator assembly 100 has good structural stability, the rotor 200 is convenient to assemble, and the assembly efficiency of the motor 1000 is improved; can meet the design requirement of miniaturization of products and has wide application range.

In some embodiments of the present invention, as shown in fig. 8 and 9, the motor 1000 is an axial magnetic field motor 1000, and the axial magnetic field motor 1000 has advantages of thin axial thickness, small space volume, light weight, high efficiency, etc. compared with the radial magnetic field motor 1000, the axial magnetic field motor 1000 has higher power density, so that the axial magnetic field motor 1000 uses less material, for example, for copper, silicon steel, permanent magnetic material, etc., and the axial magnetic field motor 1000 uses less material. Compared with some technologies, the axial magnetic field motor 1000 adopts a topological structure, and the axial dimension of the axial magnetic field motor is half of that of the traditional radial magnetic field motor 1000, so that the axial magnetic field motor is convenient to meet the miniaturization design requirement of household appliances.

As shown in fig. 9, according to some embodiments of the present invention, a shaft sleeve 50 is sleeved on the outer side of a rotating shaft 300, the shaft sleeve 50 is installed in a bearing sleeve 40 through a first bearing 60, i.e., the shaft sleeve 50 is sleeved outside the rotating shaft 300, the shaft sleeve 50 is fixed with the rotating shaft 300, the bearing sleeve 40 is sleeved inside and outside the shaft sleeve 50, the shaft sleeve 50 is indirectly fixed with a bearing seat 40 through the first bearing 60, so as to simultaneously fix the shaft sleeve 50 and the first bearing 60, and the bearing sleeve 40 is integrally injection molded on a stator assembly 100, so that a certain bearing capacity is provided, and stable arrangement of the first bearing 60 and the shaft sleeve 50 is facilitated without changing the structure of the rotating shaft 300.

Through setting up axle sleeve 50 and carrying out indirect cooperation for first bearing 60 can directly adopt conventional bearing, and pivot 300 can adopt conventional axle construction, has improved the commonality, reduce cost. Of course, a bearing corresponding to the inner diameter of the bearing housing 40 may be directly used, and the bearing may be directly installed in the bearing housing 40 of the stator assembly 100, so as to reduce components and improve assembly efficiency.

In some embodiments, as shown in fig. 7, the rotor 200 includes a rotor back iron 201 and a plurality of permanent magnets 202, the rotor back iron 201 is formed with a central through hole, the rotating shaft 300 is penetrated in the central through hole, and the rotating shaft 300 is fixed with the rotor back iron 201, the plurality of permanent magnets 202 are arranged along the circumferential direction of the central through hole at intervals, and the plurality of permanent magnets 202 are all located at one side of the rotor back iron 201 towards the axial direction of the stator, so that the occupied space of the motor 1000 in the axial direction of the rotating shaft 300 can be saved, and the axial thickness of the motor 1000 is further reduced.

In some examples, the shaft 300 is transition fit with the central through hole, and the shaft 300 and the rotor back iron 201 are welded (e.g., laser welded) fixed at the central through hole.

In some examples, the permanent magnets 202 are sintered permanent magnets 202, and the permanent magnets 202 are glued to the rotor back iron 201, or the permanent magnets 202 are die-cast on the rotor back iron 201 using magnetic powder.

It can be appreciated that the arrangement of the magnetism of the permanent magnet 202 can be specifically set according to actual requirements; for example, the magnetic poles of the plurality of permanent magnets 202 may be N-poles and S-poles sequentially arranged along the axial direction of the rotation shaft 300, or the plurality of permanent magnets 202 may be arranged using Halbach array (Halbach array), which is well known to those skilled in the art and will not be described herein.

As shown in fig. 7, in some examples, the middle of each rotor 200 has a boss 203, when the rotor 200 is mounted, the boss 203 protrudes toward the direction of the stator assembly 100, the shaft sleeve 50 is sandwiched between the two bosses 203, and the bosses 203 are fixedly connected with the shaft sleeve 50, thereby not only facilitating the mounting and matching of the rotor 200, but also making the structure compact and the arrangement more reasonable.

Wherein, the boss 203 is provided with a positioning hole 51, the shaft sleeve 50 is provided with a positioning column 205, or the boss 203 is provided with a positioning column 205, the shaft sleeve 50 is provided with a positioning hole 51, and the positioning column 205 and the positioning hole 51 are in plug-in fit to realize the positioning and installation of the rotor 200 on the shaft sleeve 50, thereby avoiding the influence of the rotor 200 installation dislocation and the like on the performance of the motor 1000. Preferably, the boss 203 is provided with a positioning column 205, the shaft sleeve 50 is provided with a positioning hole 51, and the shaft sleeve 50 can be matched with the bosses 203 of the two rotors 200 conveniently by arranging the positioning hole 51 on the shaft sleeve 50, so that the die is convenient to manufacture and open, and meanwhile, the assembly position and the assembly efficiency of the two rotors 200 are ensured. Thus, the two rotors 200 may be fixedly positioned by the first bearing 60 and the sleeve 50 mated with the stator assembly 100.

In some examples, the boss 203 and the shaft sleeve 50 further have through holes, and the rotor 200 may be fixed to the shaft sleeve 50 by passing through the through holes through fasteners, such as rivets, or the like, and of course, the boss 203 and the shaft 300 may be welded by laser welding to fix the rotor 200.

In some specific examples, as shown in fig. 7, the rotor back iron 201 is formed in a substantially disk-like structure, the rotor back iron 201 has a boss 203 and an edge portion, the edge portion is disposed around the boss 203, the boss 203 is disposed protruding from the edge portion in the axial direction of the rotation shaft 300, the center through hole is formed with the boss 203, and the permanent magnet 202 is disposed at the edge portion. Therefore, the structural strength of the boss 203 can be improved, and the rotor back iron 201 and the rotating shaft 300 can be reliably fixed.

As shown in fig. 9, according to some embodiments of the invention, the motor 1000 further includes: the first end cover 400 and the second end cover 500 are respectively arranged at two ends of the stator assembly 100, the first end cover 400 can cover one rotor 200, the second end cover 500 can cover the other rotor 200, a second installation cavity 502 is formed in the middle of the second end cover 500, a through hole is formed in the bottom wall of the installation cavity, the rotating shaft 300 can penetrate through the through hole, a second bearing 70 can be arranged in the installation cavity, the rotating shaft 300 is arranged in the second bearing 70, therefore, the rotating shaft 300 can be fixed through the first bearing 60 and the second bearing 70, the first bearing 60 and the second bearing 70 are arranged at intervals along the axial direction of the rotating shaft 300, the first bearing 60 and the second bearing 70 both support the rotating shaft 300, friction resistance in the rotating process of the rotating shaft 300 is reduced conveniently, and the rotating precision of the rotating shaft 300 is guaranteed.

As shown in fig. 7 and 9, in some specific examples, a portion of the middle of the rotor 200 protrudes into the space 101, so that a boss 203 may be formed on a side surface of the rotor 200 near the stator, and a limit recess 204 may be formed on a side surface of the rotor 200 near the end cover, the boss 203 may be inserted into the space 101, and meanwhile, the installation recess may be inserted into the limit recess 204, and the second bearing 70 is fixed in the installation recess, and neither bearing protrudes out of the top of the installation recess, thereby making the overall structure more compact, reducing the axial dimension of the motor 1000, and satisfying the design requirement of miniaturization of the product. In addition, the two rotors 200 can be fixedly positioned through the first bearing 60 matched with the stator assembly 100 and the second bearing 70 matched with the second end cover 500, so that the whole structure is compact, and the structure is stable and reliable.

As shown in fig. 9, in some examples, a clamp spring 80 is disposed on the rotating shaft 300, where the clamp spring 80 may be clamped on a side of the bottom wall of the bearing facing away from the mounting cavity, so as to avoid the influence of bearing play and the like on the structural stability.

In some examples, the first end cap 400 and the second end cap 500 are both BMC (bulk molding compound) injection molded pieces.

As shown in fig. 9, in some examples, a side of the housing 10 facing the first end cap 400 has a first mating boss 11, an edge of the first end cap 400 has a first mating groove 401, and the first mating boss 11 and the first mating groove 401 are in a plug-fit connection to implement a mating connection between the first end cap 400 and the housing 10, where the first mating groove 401 may be disposed on the housing 10, and the first mating boss 11 may be disposed on the first end cap 400.

As shown in fig. 9, in some examples, a side of the housing 10 facing the second end cap 500 has a second mating boss 12, an edge of the second end cap 500 has a second mating groove 501, and the second mating boss 12 and the second mating groove 501 are in a plug-fit connection to implement a mating connection between the second end cap 500 and the housing 10, where, of course, the second mating groove 501 may be disposed on the housing 10, and the second mating boss 12 may also be disposed on the second end cap 500.

As shown in fig. 1 to 9, the motor 1000 structure according to one embodiment of the present invention is composed of an injection molded stator assembly 100, two rotors 200, a rotating shaft 300, a first end cap 400, a first bearing 60, a second bearing 70, and a second end cap 500.

The assembly process of the motor 1000 is: firstly, an enameled wire 22 is wound on an insulating frame 21 to form a stator winding 20, a stator iron core 30 is inserted into a mounting hole 23 on the insulating frame 21, a limiting block 24 on the outer side of the insulating frame 21 is in plug-in fit with a limiting groove 41 on the periphery of a bearing sleeve 40, then the stator winding 20, the stator iron core 30 and the bearing sleeve 40 which are wound in advance are molded together to form a shell 10, and then a shaft sleeve 50 is pressed into a first bearing 60 and then pressed into the bearing sleeve 40.

After the rotating shaft 300 is installed on the shaft sleeve 50 in an interference fit manner, the rotor 200 is installed, and the rotor 200 and the rotating shaft 300 are fixedly installed, so that interference fit or laser welding can be used; a convex positioning column 205 is arranged on a boss 203 of the rotor back iron 201, and the positioning column 205 is matched and positioned with a positioning hole 51 on the shaft sleeve 50; the boss 203 of the rotor back iron 201 and the shaft sleeve 50 are provided with through holes corresponding to each other, and rivets can pass through the through holes to fix the rotor 200 on the shaft sleeve 50; finally, the first end cap 400, the second bearing 70 and the second end cap 500 are installed again, and the motor 1000 is assembled. Whereby the shaft 300 is co-located by the first bearing 60 secured to the bearing housing 40 of the stator assembly 100 and the second bearing 70 secured within the second mounting cavity 502.

Other constructions and operations of the motor 1000 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein. The vertical direction, the horizontal direction, and the front-rear direction are defined by the vertical direction, the horizontal direction, and the front-rear direction in the drawing.

In the description of the present invention, unless explicitly stated and limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact by another feature therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A stator assembly, comprising:

the bearing sleeve is annular, and the inner side of the bearing sleeve is used for installing a bearing;

the shell is arranged on the outer side of the bearing sleeve;

the stator windings are arranged between the bearing sleeve and the shell and are arranged at equal intervals along the circumferential direction of the bearing sleeve, and the middle part of each stator winding is provided with a mounting hole;

a plurality of stator cores, each stator core is arranged in each mounting hole and extends along the axial direction of the bearing,

the bearing sleeve, the shell, the stator winding and the stator core are integrally injection molded.

2. The stator assembly of claim 1, wherein the stator winding includes an insulating frame and an enamel wire wound on the insulating frame, the insulating frame having the mounting hole, one of the insulating frame and the bearing housing having a limit slot, the other of the insulating frame and the bearing housing having a limit block, the limit block being in a plug-fit with the limit slot.

3. The stator assembly of claim 1, wherein each of the stator cores includes an inner side adjacent to the bearing housing and an outer side remote from the bearing housing, wherein a length of the inner side in a circumferential direction of the bearing housing is less than a length of the outer side in the circumferential direction of the bearing housing.

4. A stator assembly according to claim 3, wherein the outer side comprises first and second outer side segments arranged radially symmetrically along the bearing housing, the angle between the first and second outer side segments ranging between 120 ° and 170 °; and/or the number of the groups of groups,

the end of the stator core is provided with a rounding angle.

5. The stator assembly of claim 1 wherein an outer side of the bearing housing abuts the housing and an inner side of the bearing housing has a mounting boss.

6. An electric machine comprising a rotating shaft, two rotors and a stator assembly according to any one of claims 1-5, wherein the two rotors are provided on both sides of the stator assembly in the axial direction of the rotating shaft.

7. The motor of claim 6, wherein a sleeve is provided on an outer side of the shaft, the sleeve being mounted in the bearing housing by a first bearing.

8. The motor of claim 7, wherein a boss is provided at a middle portion of each rotor, the shaft sleeve is sandwiched between two of the bosses and fixedly connected with the bosses, and the bosses and the shaft sleeve are in plug-in fit with each other through the positioning posts and the positioning holes.

9. The electric machine of claim 6, further comprising: a first end cover and a second end cover which are respectively arranged at two ends of the stator assembly in the axial direction of the rotating shaft and cover the rotor,

the middle part of one of the first end cover and the second end cover is provided with a mounting concave cavity, the bottom wall of the mounting concave cavity is provided with a through hole for the rotating shaft to pass through, and a second bearing matched with the rotating shaft is arranged in the mounting concave cavity.

10. The electric machine of claim 9, wherein one of the side of the housing facing the first end cap and the first end cap has a first mating boss and the other has a first mating recess, the first mating boss and the first mating recess being a plug-fit;

one of the side of the shell facing the second end cover and the second end cover is provided with a second matching lug boss, and the other side is provided with a second matching groove, and the second matching lug boss and the second matching groove are in plug-in matching.