CN112054610A

CN112054610A - Stator module, motor and direct-drive rotary table

Info

Publication number: CN112054610A
Application number: CN202010996037.XA
Authority: CN
Inventors: 薛建; 吴根城; ***; 李家乐; 汤秀清
Original assignee: Guangzhou Haozhi Electromechanical Co Ltd
Current assignee: Guangzhou Haozhi Electromechanical Co Ltd
Priority date: 2020-09-21
Filing date: 2020-09-21
Publication date: 2020-12-08

Abstract

The invention discloses a stator component, a motor and a direct-drive rotary table, comprising: the stator core is annular, a plurality of radial winding grooves are formed in the stator core, the radial winding grooves are distributed in a circumferential arrangement mode along the stator core, adjacent radial winding grooves are separated through wing structures, and the radial winding grooves comprise outer peripheral surface grooves, first end surface grooves, inner peripheral surface grooves and second end surface grooves along the winding direction; the coil winding comprises annular winding units wound in the radial winding grooves, each annular winding unit comprises a first linear side, a second linear side, a third linear side and a fourth linear side, the first linear side is located in the outer peripheral groove, the second linear side is located in the first end surface groove, the third linear side is located in the inner peripheral groove, and the fourth linear side is located in the second end surface groove. The electromechanical energy exchange place in the motor is effectively improved, and the effect of improving the torque density of the motor is further achieved.

Description

Stator module, motor and direct-drive rotary table

Technical Field

The invention is used in the technical field of motors, and particularly relates to a stator assembly, a motor and a direct-drive rotary table.

Background

As is known, the air gaps of the stator and the rotor in the motor are the main places for electromechanical energy exchange of the motor, and the torque density of the motor is directly determined by the magnetic field energy storage in the air gaps. In the prior art, the torque density of a motor is not high, the output torque is small, and the use requirement cannot be met.

Disclosure of Invention

The invention aims to at least solve one of the technical problems in the prior art, and provides a stator assembly, a motor and a direct-drive rotary table, which effectively improve the electromechanical energy exchange place in the motor and further achieve the effect of improving the torque density of the motor.

The technical scheme adopted by the invention for solving the technical problems is as follows:

in a first aspect, a stator assembly, comprises:

the stator core is annular, a plurality of radial winding grooves are formed in the stator core, the radial winding grooves are distributed in a circumferential arrangement mode along the stator core, adjacent radial winding grooves are separated through wing structures, and the radial winding grooves comprise outer peripheral surface grooves, first end surface grooves, inner peripheral surface grooves and second end surface grooves along the winding direction;

the coil winding comprises annular winding units wound in the radial winding grooves, each annular winding unit comprises a first linear side, a second linear side, a third linear side and a fourth linear side, the first linear side is located in the outer peripheral groove, the second linear side is located in the first end surface groove, the third linear side is located in the inner peripheral groove, and the fourth linear side is located in the second end surface groove.

With reference to the first aspect, in certain implementations of the first aspect, the stator core includes:

the iron core main body comprises a plurality of first stamped sheets which are stacked, each first stamped sheet comprises a ring-shaped sheet, outer circumferential fins which extend outwards in the radial direction are arranged on the outer edge of each ring-shaped sheet, inner circumferential fins which extend inwards in the radial direction are arranged on the inner edge of each ring-shaped sheet, outer circumferential grooves are formed between every two adjacent outer circumferential fins, and inner circumferential grooves are formed between every two adjacent inner circumferential fins;

the first end face wing assembly comprises a plurality of second punching sheets which are arranged in a stacked mode, the first end face wing assembly is connected to the first end face of the iron core main body corresponding to the outer circumference wing and the inner circumference wing, and a first end face groove is formed between every two adjacent first end face wing assemblies;

and the second end surface wing component comprises a plurality of stacked third punching sheets, the second end surface wing component is connected to the second end surface of the iron core main body corresponding to the outer circumference wing and the inner circumference wing, and a second end surface groove is formed between the adjacent second end surface wing components.

With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the first stamped sheet, the second stamped sheet and the third stamped sheet are respectively provided with a boss, a pit is formed on the back side of the boss, and the first stamped sheet, the second stamped sheet and the third stamped sheet which are stacked are connected with the pit in a matched manner through the bosses.

With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, the stator core further includes a support sleeve, an outer peripheral surface of the support sleeve is provided with a first groove, the support sleeve is nested inside the stator core, the wing structure is embedded in the first groove, and an inner peripheral surface of the support sleeve is provided with a second groove.

In a second aspect, an electric machine comprises:

the stator assembly comprises the stator assembly of any one of the implementation modes of the first aspect;

the rotor assembly comprises a rotor core and magnetic steel, the magnetic steel is arranged on the rotor core, the magnetic steel comprises first axial magnetic steel, radial magnetic steel and second axial magnetic steel, the first axial magnetic steel corresponds to the second linear edge, and a first air gap is formed between the stator core at the position of the second linear edge and the first axial magnetic steel; the second axial magnetic steel corresponds to the fourth linear edge, and a second air gap is formed between the stator core at the position of the fourth linear edge and the second axial magnetic steel; the radial magnetic steel corresponds to the first straight line edge or the third straight line edge, and a third air gap is formed between the stator core at the position of the first straight line edge or the third straight line edge and the radial magnetic steel.

With reference to the second aspect, in certain implementations of the second aspect, the magnetic steels are alternately distributed in N, S poles along the circumferential direction.

With reference to the second aspect and the foregoing implementation manners, in some implementation manners of the second aspect, the first axial magnetic steel and the second axial magnetic steel which are opposite to each other are of the same polarity.

With reference to the second aspect and the foregoing implementation manners, in some implementation manners of the second aspect, the rotor core includes a first rotor yoke and a second rotor yoke, the first rotor yoke includes an annular sleeve body, one end of the annular sleeve body is provided with a retaining ring extending inwards, the second rotor yoke is located on a side opposite to the retaining ring and connected to the first rotor yoke, the rotor core covers the outer side of the stator assembly, the first axial magnetic steel is connected to the retaining ring of the first rotor yoke, the second axial magnetic steel is connected to the second rotor yoke, and the radial magnetic steel is connected to the annular sleeve body.

With reference to the second aspect and the foregoing implementation manners, in some implementation manners of the second aspect, the magnetic steel surface is attached to the surface of the rotor core;

or the magnetic steel is embedded in a groove on the surface of the rotor core;

or, the magnetic steel is embedded in the rotor core.

In a third aspect, a direct-drive turntable comprises the motor in any implementation manner of the second aspect.

One of the above technical solutions has at least one of the following advantages or beneficial effects: stator module can with inner rotor or outer rotor cooperation, wherein, stator module's annular winding unit includes first straight line limit, the second straight line limit, third straight line limit and fourth straight line limit, possess three sides at least and decide, the rotor air gap, the effective coil limit number with the winding is by a limit of traditional motor, two limits promote more than at least three limits, make full use of the coil limit number of winding, the participation degree of winding coil in the interior electromagnetic field of motor has been increased, effectively promoted the electromechanical energy exchange place in the motor, and then reach the effect that promotes the torque density of motor.

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

Drawings

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

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

FIG. 2 is a front view of the structure of one embodiment shown in FIG. 1;

FIG. 3 is a cross-sectional view taken at A-A in FIG. 2;

FIG. 4 is a schematic view of a stator core construction of one embodiment shown in FIG. 1;

FIG. 5 is a schematic structural diagram of a first punching sheet of the embodiment shown in FIG. 1;

fig. 6 is a schematic diagram of a core body structure according to one embodiment shown in fig. 1;

FIG. 7 is a schematic structural diagram of a second punching sheet of the embodiment shown in FIG. 1;

FIG. 8 is a schematic illustration of the first end face wing assembly of the embodiment shown in FIG. 1;

FIG. 9 is a schematic view of the structure of one embodiment of the support sleeve shown in FIG. 1;

FIG. 10 is an isometric view of one embodiment of the annular winding unit structure shown in FIG. 1;

FIG. 11 is a front view of the structure of one embodiment of the toroidal winding unit shown in FIG. 1;

FIG. 12 is a front view of a rotor assembly configuration for one embodiment of the motor of the present invention;

FIG. 13 is a schematic cross-sectional view taken at B-B of FIG. 12;

FIG. 14 is a schematic cross-sectional view taken at C-C of FIG. 13;

FIG. 15 is an isometric view of one embodiment rotor assembly structure shown in FIG. 12;

FIG. 16 is a topological structure diagram of one embodiment shown in FIG. 12;

fig. 17 is a schematic structural diagram of one embodiment of a direct-drive turntable.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the present invention, if directions (up, down, left, right, front, and rear) are described, it is only for convenience of describing the technical solution of the present invention, and it is not intended or implied that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, it is not to be construed as limiting the present invention.

In the invention, the meaning of "a plurality" is one or more, the meaning of "a plurality" is more than two, and the terms of "more than", "less than", "more than" and the like are understood to exclude the number; the terms "above", "below", "within" and the like are understood to include the instant numbers. In the description of the present invention, if there is description of "first" and "second" only 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 present invention, unless otherwise specifically limited, the terms "disposed," "mounted," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or indirectly connected through an intermediate; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above-mentioned words in the present invention can be reasonably determined by those skilled in the art in combination with the detailed contents of the technical solutions.

An embodiment of the present invention provides an electric machine comprising a stator assembly 2 and a rotor assembly 3, the stator assembly 2 comprising a stator core 21 and coil windings, see fig. 1, 2, 3. Referring to fig. 4, the stator core 21 is annular, the stator core 21 is provided with a plurality of radial winding slots 211, the plurality of radial winding slots 211 are distributed in a circumferential direction of the stator core 21, adjacent radial winding slots 211 are separated by a wing structure, and the wing structure is used as a part of the stator core 21 and is used for magnetic conduction together with the stator core 21. The radial winding groove 211 is in a shape of a Chinese character 'hui', and the radial winding groove 211 includes an outer circumferential groove 2111, a first end surface groove 2112, an inner circumferential groove 2113, and a second end surface groove 2114 in a winding direction. Further construction and forming methods of the stator assembly 2 are described in further detail below.

The coil winding is in an annular concentrated winding form and is wound by round copper wires or flat copper wires, the design of the annular winding is combined with fig. 10 and fig. 11, the coil winding comprises annular winding units 22 wound in radial winding grooves 211, the annular winding units 22 are in a shape like a Chinese character 'hui', each annular winding unit 22 comprises a first straight line side 221, a second straight line side 222, a third straight line side 223 and a fourth straight line side 224, the first straight line side 221 is located in an outer peripheral groove 2111, the second straight line side 222 is located in a first end surface groove 2112, the third straight line side 223 is located in an inner peripheral groove 2113, the fourth straight line side 224 is located in a second end surface groove 2114, and the annular winding units 22 are located in the radial winding grooves 211, so that end leakage reactance is reduced, and motor efficiency is improved. In combination with the structural form of the stator core 21, an automatic winding machine can be conveniently employed to wind the coil windings into the radial winding slots 211 of the stator core. For example, in some embodiments, the radial winding slots 211 of the stator core are first covered with an insulating layer, and the insulating structure may be designed by arranging insulating paper, or by using an insulating coating process, or by using an insulating winding frame that is die-cast and opened to isolate the winding from the core, and after the winding is wound, the winding is finally shaped by using a die shaping die.

The stator winding adopts an annular concentrated winding form, motor-driven winding can be easily realized through an automatic winding machine, and the process is extremely simple. The winding enameled wire can select a round wire and also can select a flat wire, so that the design space of the winding is greatly enriched, and favorable conditions are created for improving the torque density of the motor.

As can be seen from fig. 11, in some embodiments applicable to the outer rotor, both of the straight sides L1 and L2 are effective element sides of the coil winding, and both participate in the electromechanical energy exchange of the electromagnetic field. The number of the effective coil sides is increased from one or two of the traditional motors to at least three, so that the number of the coil sides of the winding is fully utilized, the participation degree of the winding coil in an electromagnetic field in the motor is increased from traditional 1/2 to 3/4 by 50%, and the torque density of the motor in the same way can be correspondingly increased by 50%; in addition, after the annular winding is adopted, the height of the end part of the coil is greatly reduced, and valuable space in the rotary table is released, so that more effective materials of the motor can be filled to improve the power and the torque of the rotary table.

In other words, the stator assembly 2 can be matched with the inner rotor or the outer rotor, wherein the annular winding unit 22 of the stator assembly 2 comprises a first linear side 221, a second linear side 222, a third linear side 223 and a fourth linear side 224, and at least three stator and rotor air gaps are provided, so that the number of effective coil sides of the winding is increased to more than at least three sides from one side and two sides of a traditional motor, the number of coil sides of the winding is fully utilized, the participation degree of the winding coil in an electromagnetic field in the motor is increased, the electromechanical energy exchange place in the motor is effectively increased, and the effect of increasing the torque density of the motor is further achieved.

The stator core is made of silicon steel sheets of high-permeability materials and is formed in a special die in a punching mode, and the stator core is a main permeability part of the motor. The stator core 21 includes a core body 212, a first end face wing assembly 213, and a second end face wing assembly. With reference to fig. 5 and 6, the core main body 212 includes a plurality of stacked first stamped pieces 2121, each first stamped piece 2121 includes a ring-shaped piece, an outer circumferential fin 2122 extending radially outward is disposed on an outer edge of the ring-shaped piece, an inner circumferential fin 2123 extending radially inward is disposed on an inner edge of the ring-shaped piece, the inner circumferential fin 2123 and the outer circumferential fin 2122 are correspondingly distributed on the inner and outer edges of the ring-shaped piece, an outer circumferential groove 2111 is formed between adjacent outer circumferential fins 2122, and an inner circumferential groove 2113 is formed between adjacent inner circumferential fins 2123.

Referring to fig. 4, the first end surface fin assembly 213 includes a plurality of second punching sheets 2131 stacked one on another, the second punching sheets 2131 have the same or similar shape as the combination of the inner circumferential fins 2123 and the outer circumferential fins 2122, and the first end surface fin assemblies 213 are connected to the first end surface of the core main body 212 corresponding to the outer circumferential fins 2122 and the inner circumferential fins 2123, and first end surface grooves 2112 are formed between the adjacent first end surface fin assemblies 213.

The second end face wing assembly is similar to the first end face wing assembly 213 in structure, and includes a plurality of stacked third stamped sheets, the second end face wing assembly is connected to the second end face of the core main body 212 corresponding to the outer circumferential wing 2122 and the inner circumferential wing 2123, and a second end face groove 2114 is formed between adjacent second end face wing assemblies.

The first punching sheet 2121 and the first punching sheet 2121, the second punching sheet 2131 and the second punching sheet 2131, the third punching sheet and the third punching sheet, the first punching sheet 2121 and the second punching sheet 2131, and the first punching sheet 2121 and the third punching sheet can be connected in a bonding and/or welding and/or assembling connection mode and the like.

With reference to fig. 5 and 7, the first stamped piece 2121, the second stamped piece 2131 and the third stamped piece are respectively provided with a boss 214, a pit is formed on the back side of the boss 214, the first stamped piece 2121, the second stamped piece 2131 and the third stamped piece form the boss 214 and the pit in a stamping manner, and the first stamped piece 2121, the second stamped piece 2131 and the third stamped piece which are stacked are matched, positioned and connected with the pit through the boss 214, so that the positioning is more accurate, and the stator core 21 can be conveniently manufactured.

It is understood that the stator core 21 may be integrally die-cast using SMC powder metallurgy.

The stator core 21 of the embodiment of the invention has various forms, abundant design space, free manufacturing process and good effect.

According to the invention, only one set of die is required to be opened for the stator punching sheet, and the output power and the torque of the motor can be flexibly adjusted as required by adjusting the axial stacking height of the stator core 21, so that the standardized design and the modularized design are realized, and the universality of the product is improved.

In some embodiments, the stator assembly 2 is matched with an outer rotor, referring to fig. 1, 2 and 9, the stator assembly 2 further includes a support sleeve 23, the support sleeve 23 is made of a non-magnetic material, a first groove 231 is formed on an outer circumferential surface of the support sleeve 23, the support sleeve 23 is nested inside the stator core 21, and the wing structures are embedded in the first groove 231 to realize a matching connection, so as to perform a supporting function. The inner peripheral surface of support cover 23 is equipped with second groove 232, and second groove 232 can be single, also can be many, with building when cooperating with the bearing frame excircle and connecting and play the effect of special transfer moment of torsion.

The rotor assembly 3 may be in the form of an inner rotor or an outer rotor, and the rotor assembly 3 is a rotating element of the motor and an actuating element for converting electric energy into mechanical energy. With reference to fig. 12 to 16, the rotor assembly 3 includes a rotor core and magnetic steels, the magnetic steels are disposed on the rotor core, the magnetic steels include a first axial magnetic steel 31, a radial magnetic steel 32 and a second axial magnetic steel 33, the first axial magnetic steel 31 corresponds to the second linear edge 222, the stator core of the second linear edge 222 at a corresponding position thereof generates a magnetic field, and a first air gap is formed between the stator core at the position of the second linear edge 222 and the first axial magnetic steel 31; the second axial magnetic steel 33 corresponds to the fourth linear edge 224, the stator core of the fourth linear edge 224 at the corresponding position generates a magnetic field, and a second air gap is formed between the stator core at the position of the fourth linear edge 224 and the second axial magnetic steel 333; the radial magnetic steel 32 corresponds to the first straight line side 221 or the third straight line side 223, the stator core at the position corresponding to the first straight line side 221 or the third straight line side 223 generates a magnetic field, and a third air gap is formed between the stator core at the position corresponding to the first straight line side 221 or the third straight line side 223 and the radial magnetic steel 32. As shown in fig. 13, the rotor assembly 3 is a half-enclosed three-dimensional structure formed by radial magnetic steels 32 and two end-face axial magnetic steels, and the whole structure is equivalent to three rotors. With reference to fig. 16, the embodiment of the present invention provides a novel motor topology structure, which is equivalent to a stator with windings, and the stator and three permanent magnet rotors form a permanent magnet synchronous motor as a whole, and the motor has a unique axial and radial three-dimensional magnetic flux multi-air gap characteristic, and because one motor has multiple electromechanical energy exchange places, the overall power density and torque density of the motor can be effectively improved.

With reference to fig. 13-15, the magnetic steels are alternately distributed along the circumferential direction according to N, S poles, and the first axial magnetic steel 31 and the second axial magnetic steel 33 which are opposite to each other are of the same polarity.

The coil winding is wound on the stator core 21 by adopting a ring winding, and the magnetic steel providing the axial magnetic flux falls on the rotor core, so that the final effect is shown in fig. 13. According to the principle of electromechanics, when symmetrical current is applied to the coil winding, the stator core 21 with the winding, the first axial magnetic steel 31 and the rotor core form an axial magnetic flux disc motor, the magnetic line of force of the axial magnetic flux disc motor is as shown in a magnetic circuit in fig. 16, and similarly, the stator core 21 with the winding, the second axial magnetic steel 33 and the rotor core also form an axial magnetic flux disc motor, the magnetic line of force of the axial magnetic flux disc motor is distributed as shown in a magnetic circuit in fig. 16, and the left disc motor and the right disc motor are combined to form an axial magnetic flux disc motor which is symmetrical in axis.

The coil winding is wound on the stator core 21 by adopting an annular winding, the radial magnetic steel 32 providing the radial magnetic flux falls on the rotor core to form the effect as shown in fig. 13, according to the principle of electromechanics, the three-phase windings are symmetrically distributed along the circumferential direction, after symmetrical three-phase current is introduced, the stator core 21 with the winding, the radial magnetic steel 32 and the rotor core form a traditional radial magnetic flux motor, and the magnetic line of force of the motor is shown in a magnetic circuit in fig. 16. Finally, it can be seen that the three magnetic lines of force are actually closed along their own magnetic flux paths without mutual interference, and only when specifically designed, saturation of the stator core 21 is avoided. The permanent magnet synchronous motor with the axial-radial three-dimensional magnetic flux and the multiple air gaps is finally formed, and the distribution of magnetic lines of force of the motor can be obviously seen, the number of effective sides of the coil winding is changed from two original sides to three original sides, the effective sides of the coil winding are improved, and the power density and the torque density of the motor are naturally improved.

In some embodiments, referring to fig. 13, the rotor core includes a first rotor yoke 34 and a second rotor yoke 35, the first rotor yoke 34 and the second rotor yoke 35 are made of high-quality magnetic low-carbon steel, the first rotor yoke 34 includes an annular sleeve, one end of the annular sleeve is provided with an inwardly extending baffle ring, the second rotor yoke 35 is connected to the first rotor yoke 34 on the side opposite to the baffle ring, the rotor core covers the outside of the stator assembly 2, the first axial magnetic steel 31 is connected to the baffle ring of the first rotor yoke 34, the second axial magnetic steel 33 is connected to the second rotor yoke 35, and the radial magnetic steel 32 is connected to the annular sleeve. The magnetic steel can be divided into a plurality of sections according to the effective length of the rotor yoke.

The magnetic steel can be connected with the rotor core in various ways, for example, the surface of the magnetic steel is attached to the surface of the rotor core; or the magnetic steel is embedded in a groove on the surface of the rotor core; or the magnetic steel is embedded in the rotor core. The magnetic steel can also adopt Halbach array magnetic steel.

The embodiment of the invention also provides a direct-drive turntable which comprises the motor of any one of the embodiments. Specifically, referring to fig. 17, the direct-drive turntable includes a bearing seat 1010, a base 1020, a lifting ring 1030, a rear cover 1040, a rotor assembly 3, a stator assembly 2, a tapered roller bearing 1070, a lock nut 1080, an encoder mounting seat 1090, an encoder 1100, a bearing inner spacer 1110, a bearing outer spacer 1120, a rotating shaft 1130, a framework oil seal 1140, a bearing gland 1150, a rotary disc 1160, and a dust cap 1170.

Bearing seat 1010 is assembled in the inner hole of base 1020; the stator component 2 is assembled on the excircle of the bearing seat 1010; a rear cover 1040 is assembled on the rear side of the base 1020 for protection; the bearing gland 1150 is assembled on the end face of the bearing seat 1010, and is stressed together with the end face of the inner hole of the bearing seat 1010 through the bearing outer spacer 1120 to press the outer rings of the two tapered roller bearings 1070 to play a role in fixing the outer rings of the tapered roller bearings 1070; the framework oil seal 1140 is assembled in the inner hole of the bearing gland 1150 and the outer circle of the rotating shaft 1130 in FIG. 1 to play a role in sealing; the dustproof cover 1170 is circularly assembled on the end face of the bearing seat 1010 to play a dustproof role; the hoisting ring 1030 is assembled on the base 1020 to play a hoisting role; the above parts constitute the static part of the motor.

The inner ring of the tapered roller bearing 1070 and the bearing inner spacer 1110 are assembled on a rotating shaft 1130 together, and are pressed and fixed in the inner hole of the bearing seat 1010 through the locking nut 1080 and the end surface of the excircle step of the rotating shaft 1130; a rotary disk 1160 is assembled on the left end face of the rotary shaft 1130 in FIG. 1; the rotor assembly 3 is assembled on the rotating shaft 1130 as the right excircle of fig. 1, a gap exists between the excircle of the rotor assembly 3 and the inner hole of the base 1020, and air gaps designed by a motor exist between the inner hole and two inner end surfaces of the rotor assembly 3 and the excircle and two end surfaces of the stator assembly 2; the encoder 1100 is assembled on the encoder mounting base 1090 and then assembled on the end face of the rotor assembly 3; the above parts constitute the rotating part of the motor.

The rotary part of the drive motor is controlled by the frequency converter and the encoder closed loop to do rotary motion relative to the static part under the support of the tapered roller bearing 1070.

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

The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope of the claims of the present application.

Claims

1. A stator assembly, comprising:

2. The stator assembly of claim 1, wherein the stator core comprises:

3. The stator assembly according to claim 2, characterized in that the first punching sheet, the second punching sheet and the third punching sheet are respectively provided with a boss, a pit is formed on the back side of the boss, and the first punching sheet, the second punching sheet and the third punching sheet which are arranged in a stacked manner are connected with the pit in a matched manner through the bosses.

4. The stator assembly of claim 1, further comprising a support sleeve, wherein the support sleeve is provided with a first groove on the outer peripheral surface, the support sleeve is nested inside the stator core, the wing structures are embedded in the first groove, and the support sleeve is provided with a second groove on the inner peripheral surface.

5. An electric machine, comprising:

comprising the stator assembly of any of claims 1-4;

6. The electric machine of claim 5, wherein said magnetic steels are circumferentially alternated with N, S poles.

7. The electric machine of claim 6, wherein the first and second opposing axial magnets are of the same polarity.

8. The electric machine of claim 5, wherein the rotor core comprises a first rotor yoke and a second rotor yoke, the first rotor yoke comprises an annular sleeve, one end of the annular sleeve is provided with an inwardly extending stop ring, the second rotor yoke is connected to the first rotor yoke on the side opposite to the stop ring, the rotor core covers the outer side of the stator assembly, the first axial magnetic steel is connected to the stop ring of the first rotor yoke, the second axial magnetic steel is connected to the second rotor yoke, and the radial magnetic steel is connected to the annular sleeve.

9. The electric machine of claim 5, wherein said magnetic steel surface is affixed to said rotor core surface;

or the magnetic steel is embedded in a groove on the surface of the rotor core;

or, the magnetic steel is embedded in the rotor core.

10. A direct drive turntable, characterized in that it comprises a motor as claimed in any one of claims 5 to 9.