CN218102744U - Stator structure for motor, motor and fan - Google Patents

Abstract

The utility model discloses a stator structure, motor and fan for motor. This stator structure includes: a plurality of iron core units, it is a plurality of the iron core unit is followed the circumference end to end concatenation of motor is in order to form annular stator core, every the iron core unit includes: half tooth portions and yoke portion, half tooth portion sets up respectively the both ends of yoke portion, every be provided with connecting portion on half tooth portion, wherein in the week, two adjacent in two the iron core unit half tooth portion links to each other through respective connecting portion. According to the utility model discloses a stator structure for motor through setting up the concatenation position on half tooth portion, has reduced the influence of concatenation position to yoke portion, guarantees that stator core's intensity is higher.

Description

Stator structure for motor, motor and fan

Technical Field

The utility model relates to the technical field of electric machines, particularly, relate to a fan that is used for the stator structure of motor, has this a stator structure for motor and has this motor.

Background

In the related art, the stator core of the hollow motor is formed by stamping a whole circular ring by using a whole plate and then laminating, and an intermediate material is discarded, so that the material utilization rate is low and the motor cost is high. The splicing mode is adopted in the industry, the yoke part of the stator core is spliced, but for the hollow motor, the yoke part of the stator core is very narrow, the structural strength of the stator is very weak, and the reliability and the manufacturability are poor.

In addition, the motor stator and the shaft sleeve are mostly combined by adopting circumferential tight fit, but in order to ensure that the stator yoke has enough mechanical strength, the stator yoke cannot be narrowed (the thickness of the stator yoke is required to be more than or equal to 6 mm), so that the material waste and the motor cost are caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the above-mentioned technical problem among the prior art to a certain extent at least. Therefore, the utility model provides a stator structure for motor forms stator core through splicing at half tooth portion, and stator core's intensity is higher.

The utility model also provides a motor of having above-mentioned stator structure for motor.

The utility model also provides a fan with above-mentioned motor.

According to the utility model discloses a stator structure for motor includes: a plurality of iron core units, it is a plurality of the iron core unit is followed the circumference end to end concatenation of motor is in order to form annular stator core, every the iron core unit includes: half tooth portions and yoke portion, half tooth portion sets up respectively the both ends of yoke portion, every be provided with connecting portion on half tooth portion, wherein in the week, two adjacent in two the iron core unit half tooth portion links to each other through respective connecting portion.

According to the utility model discloses a stator structure for motor, through setting up the concatenation position on half tooth portion, reduced the influence of concatenation position to yoke portion, guarantee that stator core's intensity is higher.

According to some embodiments of the invention, the core unit further comprises: all tooth portions, all tooth portions set up in yoke portion and two that are located both ends between the half tooth portions.

According to some embodiments of the invention, two of the half teeth are connected through respective connecting portions to form one of the full teeth.

According to some embodiments of the invention, one of the half-teeth of the core unit is provided with a groove and the other of the half-teeth is provided with a protrusion, wherein the groove and the protrusion are configured as the connecting portion.

According to some embodiments of the invention, each of the half tooth portions has a connection side adapted to be connected to another adjacent half tooth portion, and the groove is recessed from the connection side or the protrusion protrudes from the connection side.

According to some embodiments of the present invention, the groove or the protrusion is located at a corresponding middle position of the connection side surface in a radial direction of the motor.

According to some embodiments of the invention, two axial end faces of the projection are flush with two axial end faces of the corresponding half tooth portion, respectively; the groove extends along the axial direction of the motor and penetrates through two axial end faces of the corresponding half tooth part.

According to some embodiments of the invention, the opening width of the groove is smaller than the width of the root of the groove, the protrusion is adapted to the shape of the groove.

According to some embodiments of the present invention, the ratio range of the radial width of the yoke portion and the circumferential width of the full tooth portion is: 1/2-2/3.

According to some embodiments of the present invention, the ratio range of the circumferential width of the connecting portion and the circumferential width of the full tooth portion is: 0.15 to 0.4.

According to some embodiments of the present invention, the radial width of the core unit is F, the circumferential width of the full tooth portion is D, the radial width of the yoke portion is E, and D, E, F satisfy the relation: e +0.5D is less than or equal to F and less than or equal to E + D.

According to the utility model discloses a some embodiments, the iron core unit is convex structure, just the internal diameter of iron core unit with the ratio scope of the external diameter of iron core unit is: 0.6 to 0.95.

According to some embodiments of the utility model, stator structure still includes annular insulating frame, insulating frame is fixed in stator core's axial both ends, insulating frame has and imbeds at least adjacent two inlay the portion of establishing between the full tooth portion, it has the winding and dodges the groove to inlay the portion of establishing.

According to some embodiments of the invention, the insulating frame of at least one end has a frame collar protruding towards the one side that deviates from the core unit along the axial of the stator core.

According to the utility model discloses electric machine of second aspect embodiment, including the aforesaid a stator structure for electric machine.

According to the utility model discloses fan of third aspect embodiment, including flabellum and foretell motor, the flabellum by motor drive rotates.

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

Fig. 1 is a schematic view of a core unit;

FIG. 2 is a schematic view of a stator core;

fig. 3 is a schematic view of the assembly of the stator core with the insulating frame;

FIG. 4 is a perspective view of an insulating frame with a frame stop ring;

FIG. 5 is a top view of an insulating frame with a frame stop ring;

fig. 6 is a front view of an insulating frame with a frame stop.

Reference numerals:

the stator core 31, the core unit 311, the half-tooth portion 312, the first half-tooth portion 3121, the second half-tooth portion 3122, the yoke portion 313, the connection portion 314, the first connection portion 3141, the second connection portion 3142, the full-tooth portion 315, the first connection side 3161, the second connection side 3162, the winding groove 317, the limit structure 318, the first insulating frame 33, the frame retainer ring 331, the frame body 332, the embedding portion 333, the second insulating frame 34, and the winding escape groove 35.

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 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 drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but 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 therefore, should not be construed as limiting the present invention.

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

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

A stator structure for an electric machine according to an embodiment of the present invention is described in detail below with reference to fig. 1 to 6.

Referring to fig. 1 to 2, a stator structure for an electric machine according to an embodiment of the present invention may include: and the plurality of iron core units 311 are spliced end to end along the circumferential direction of the motor to form the annular stator iron core 31. For example, in the specific example shown in fig. 2, three core units 311 are spliced end to end in the circumferential direction of the motor to form one complete, annular stator core 31.

Alternatively, the core unit 311 may be laminated from a soft magnetic material.

Each of the core units 311 may include: half tooth parts 312 and a yoke part 313, the half tooth parts 312 are respectively arranged at two ends of the yoke part 313, a connecting part 314 is arranged on each half tooth part 312, wherein two adjacent half tooth parts 312 in two iron core units 311 are connected through the respective connecting parts 314 in the circumferential direction. Specifically, the half-tooth portion 312 of each core unit 311 may include a first half-tooth portion 3121 and a second half-tooth portion 3122, the first half-tooth portion 3121 is disposed at one end of the yoke portion 313, the second half-tooth portion 3122 is disposed at the other end of the yoke portion 313, the connection portion 314 includes a first connection portion 3141 and a second connection portion 3142, the first connection portion 3141 is disposed on the first half-tooth portion 3121, the second connection portion 3142 is disposed on the second half-tooth portion 3122, and the first connection portion 3141 on the first half-tooth portion 3121 of one core unit 311 is connected with the second connection portion 3142 on the second half-tooth portion 3122 of an adjacent core unit 311 to achieve splicing of the adjacent two core units 311. The weight of the stator structure can be reduced without the help of a fastener, the assembly steps are reduced, the cost is saved, and the working hours are saved.

According to the utility model discloses a loss that iron core material has been reduced to the influence of splicing position to yoke portion 313, guarantees that stator core 31's intensity is higher through setting up the splicing position of two adjacent iron core units 311 on partly tooth 312, and the intermediate material when having avoided whole punching press stator core simultaneously is extravagant, can alleviate stator structure's weight, reduces stator structure's cost, reduces the technology degree of difficulty. Furthermore, the utility model discloses stator structure can let yoke portion 313 do more thinly, realizes that radial ring width is ultra-thin, the cavity is regional big, realizes that the radial ring width of motor is ultra-thin to let the ring width of annular motor ultra-thin (less than or equal to bearing ring width +6 mm), provides a thin ring macropore structure motor simultaneously, lets the complete machine molding more diversified to annular motor's structural strength and electrical safety have been guaranteed.

In some embodiments of the present invention, referring to fig. 1-2, the core unit 311 may further include a full tooth portion 315, the full tooth portion 315 is disposed on the yoke portion 313, and the full tooth portion 315 is located between the two half tooth portions 312 at both ends. Specifically, one end of the yoke portion 313 is a first half tooth portion 3121, the other end of the yoke portion 313 is a second half tooth portion 3122, and the full tooth portion 315 is located between the first half tooth portion 3121 and the second half tooth portion 3122. The number of the full teeth 315 is multiple, for example, five, six, etc., and a winding slot 317 is formed between two adjacent full teeth 315, and the stator winding is suitable to be wound at the winding slot 317.

In some embodiments of the present invention, the two half teeth 312 are connected by respective connecting portions 314 to form a full tooth 315. The circumferential widths of the full tooth portions 315 are equal, and the circumferential distances between any two adjacent full tooth portions 315 are equal, so that the structure of the stator core 31 is uniform.

Alternatively, for the stator core 31, the number of the full teeth portions 315 is not less than 15 and not more than 45, and the number of the full teeth portions 315 is an integral multiple of 3.

In some embodiments of the present invention, a groove is disposed on one of the half-tooth portions 312 of the core unit 311 and a protrusion is disposed on the other half-tooth portion 312, wherein the groove and the protrusion are configured as the connecting portion 314. In other words, the first connection portion 3141 is a groove, and the second connection portion 3142 is a protrusion. When the two iron core units 311 are spliced, the groove of one iron core unit 311 is embedded and matched with the protrusion of the adjacent iron core unit 311 so as to realize the connection of the two iron core units 311.

In some embodiments of the present invention, each half tooth 312 has a connecting side adapted to connect with another adjacent half tooth 312, and a groove is recessed from or protrudes from the connecting side. Specifically, the first half tooth 3121 has first connection side surfaces 3161, on which grooves are provided on the first connection side surfaces 3161, the grooves being recessed from the first connection side surfaces 3161. The second half tooth 3122 has a second connecting side surface 3162, and a protrusion is disposed on the second connecting side surface 3162 and protrudes from the second connecting side surface 3162. When two adjacent iron core units 311 are spliced, the connection side surfaces of the two iron core units 311 are attached.

In some embodiments of the present invention, the groove or the protrusion is located at a middle position of the corresponding connecting side surface in a radial direction of the motor. For example, the groove is at a central position of the first connection side 3161 and the protrusion is at a central position of the second connection side 3162. In this way, the connection portion 314 has a small influence on the strength of the half-tooth portion 312, and further, when a plurality of core units 311 are joined to form one stator core 31, the strength of the stator core 31 is high.

In some embodiments of the present invention, two axial end surfaces of the protrusion are respectively flush with two axial end surfaces of the corresponding half-tooth portion 312; the grooves extend in the axial direction of the motor and penetrate both axial end faces of the corresponding half tooth portions 312. In other words, the protrusion extends in the axial direction of the core unit 311, and the axial height of the protrusion is equal to the axial height of the half tooth 312. Similarly, the groove extends in the axial direction of the core unit 311, and the axial height of the groove is equal to the axial height of the half tooth 312.

In some embodiments of the present invention, the opening width of the groove is smaller than the width of the root of the groove, and the protrusion is adapted to the shape of the groove. Therefore, the grooves and the protrusions are both in a dovetail shape, the grooves and the adjacent protrusions form dovetail buckles, when the grooves and the protrusions are matched in an embedded mode, the connection strength is high, and the two iron core units 311 are not prone to being separated. During assembly, the protrusion can be inserted into the groove along the axial direction. The iron core units 311 can be effectively and quickly connected by adopting the split dovetail buckle mode, and the iron core units 311 can be punched by adopting strip-shaped materials, so that the utilization rate of the materials can be effectively improved.

In some embodiments of the present invention, the ratio of the radial width of the yoke 313 to the circumferential width of the full tooth 315 ranges from: 1/2-2/3. Specifically, the radial width of the yoke portion 313 is E, the circumferential width of the full tooth portion 315 is D, E/D is greater than or equal to 1/2 and less than or equal to 2/3, and when E/D exceeds 1/2 to 2/3, the utilization rate and the magnetic efficiency of the motor stator core 31 are low, so that the number of teeth of the full tooth portion 315 of the motor cannot be too high, the number of teeth of the full tooth portion 315 of the permanent magnet outer rotor motor in the industry is generally concentrated in 6 to 12 teeth, and the ring shape of the stator core 31 is restricted to be narrow.

Alternatively, E/D may be 0.5, 0.55, 0.6, 0.66, etc., although E/D may be other values between 1/2 and 2/3, which are not listed here. In one specific example, D =5mm, e =2.6mm, e/D =0.52.

The circumferential width D of the full tooth 315 is wider than the radial width E of the yoke 313, and the dovetail catch is divided in parallel along the direction of the magnetic field flow without affecting the normal flow direction of the magnetic flux, so that the efficiency of the stator core 31 is not affected, and the mechanical strength of the fastened stator core 31 is ensured to be high.

In some embodiments of the present invention, the ratio of the circumferential width of the connecting portion 314 to the circumferential width of the full tooth portion 315 is: 0.15 to 0.4. Specifically, the circumferential width of the connecting portion 314 is C, the circumferential width of the full tooth portion 315 is D, and C/D is 0.15 ≦ C/D ≦ 0.4, alternatively, C/D may be 0.15, 0.2, 0.3, 0.4, and the like, and of course, C/D may be other values between 0.15 and 0.4, which are not listed here. When the C/D is less than 0.15, the circumferential width of the connecting part 314 is smaller, so that the connecting strength of the connecting parts 314 of two adjacent iron core units 311 is smaller; when C/D > 0.4, the circumferential width of the connection portion 314 is long, resulting in an excessive magnetic resistance, thereby increasing heat generation and damage of the stator core 31, and thus reducing motor efficiency.

In one particular example, C =1mm, D =5mm, C/D =0.2.

In some embodiments of the present invention, the radial width of the core unit 311 is F, the circumferential width of the full tooth portion 315 is D, the radial width of the yoke portion 313 is E, and D, E, F satisfy the following relation: e +0.5D is less than or equal to F and less than or equal to E + D. When F is less than E +0.5D, the radial width of the core unit 311 is too small, which results in a difficult stator winding process, or the circumferential width of the full tooth 315 and the radial width of the yoke 313 are too large, which results in a low material utilization rate and an increase in motor cost. When F > E + D, the circumferential width of the full tooth 315 and the radial width of the yoke 313 are excessively small, resulting in an excessively long magnetic path and large loss, thereby reducing the motor efficiency.

Optionally, F = E +0.76D. In one specific example, D =5mm, e =2.6mm, f =6.4mm.

In some embodiments of the present invention, the core unit 311 is a circular arc structure, and the ratio range between the inner diameter of the core unit 311 and the outer diameter of the core unit 311 is: 0.6 to 0.95. The inner diameter of the core unit 311 is R1, the outer diameter of the core unit 311 is R2, R1/R2 is 0.6 ≦ R1/R2 ≦ 0.95, alternatively, R1/R2 may be 0.7, 0.75, 0.8, 0.85, 0.9, and the like, and of course, R1/R2 may be other values between 0.6 and 0.95, which are not listed here. When R1/R2 is less than 0.6, the radial width of the core unit 311 (also called the ring width of the stator core 31) is large, and when the outer diameter of the stator core 31 needs to be ensured, the inner hole of the stator core 31 is too small, which affects the air outlet effect of the hollow inner hole; when the inner diameter of the stator core 31 needs to be ensured, the outer diameter of the stator core 31 is too large, so that the working area of the fan blades is influenced, and the air output is further influenced. When R1/R2 > 0.95, the radial width of the full tooth 315 and the radial width of the yoke portion 313 are too small, and the stator core 31 has high magnetic density, large iron loss, and high heat generation, which affects the motor efficiency.

Optionally, R1/R2 further satisfies: R1/R2 is more than or equal to 0.7 and less than or equal to 0.9.

In one particular example, R1 and R2 may be inner radius values, R1=80.2mm, R2=93mm, R1/R2 ≈ 0.86.

Can set up limit structure 318 on the inner peripheral surface of iron core unit 311, like this, when locating other spare parts of motor outside with stator core 31 cover, can realize the spacing cooperation with this spare part through limit structure 318, for example, after stator core 31 embolias the stator axle sleeve, limit structure 318 and stator axle sleeve cooperation, can restrict stator core 31 and stator axle sleeve effectively and produce the slip of circumferencial direction, prevent that stator core 31 and stator axle sleeve from producing not hard up, thereby can prevent to produce vibration and noise between stator core 31 and the stator axle sleeve, also avoided leading to stator core 31 to warp because of stator axle sleeve and stator core 31's interference fit simultaneously. Moreover, when circumferential spacing is realized between the stator core 31 and the stator shaft sleeve without circumferential tight fit, the thickness of the yoke portion 313 of the stator core 31 may be set to be narrower, for example, may be smaller than 6mm.

Alternatively, the limiting structure 318 may protrude from the inner circumferential surface of the core unit 311, or may be recessed into the inner circumferential surface of the core unit 311 to form a groove shape.

In some embodiments of the present invention, the stator structure further includes an annular insulating frame fixed to both axial ends of the stator core 31. Specifically, the insulating frame includes a first insulating frame 33 and a second insulating frame 34, the first insulating frame 33 is fixed to one axial end of the stator core 31, and the second insulating frame 34 is fixed to the other axial end of the stator core 31. The first insulating frame 33 and the second insulating frame 34 can perform insulating protection on two axial ends of the stator core 31, so that the use safety of the stator structure is improved. Each insulating frame can be of an integral structure or an annular structure formed by splicing a plurality of frame bodies in a split mode. In addition, annular insulating frames are respectively sleeved at two ends of the stator core 31, so that two adjacent core units 311 are not easy to separate, and the structural stability of the annular stator core 31 can be further enhanced. In the industry, the stator insulation of the low-voltage permanent magnet external rotation motor also adopts an insulation layer coating mode to realize insulation, but the mode can not help the circumferential strength of the stator core 31, only plays an insulation protection effect, and the coating layer is easy to fall off to cause safety accidents.

The circumference retaining ring structure that insulating frame adopted can effectively and further strengthen the intensity of stator core 31 circumference, also can let the yoke width 313 do more narrowly, and the stator number of teeth has bigger selection to let the performance of motor more steady reliable, and vibration and noise when can effectively preventing and reducing the rotor rotation.

The insulating frame is provided with an embedding part 333, the embedding part 333 is embedded between at least two adjacent full tooth parts 315, and the embedding part 333 is provided with a winding avoiding groove 35 for avoiding the stator winding. That is to say, the insulating frame and the stator core 31 may be fixedly embedded, so that the embedded portion 333 can perform insulation protection on a position between two adjacent full teeth 315, and the embedded portion 333 does not additionally occupy an axial space of the stator core 31.

In some embodiments of the utility model, the insulating frame of at least one end has frame retaining ring 331, and frame retaining ring 331 is protruding towards one side that deviates from iron core unit 311 along stator core 31's axial, and frame retaining ring 331 can promote insulating frame's structural strength on the one hand, and on the other hand can make other structures separate in stator core 31 and the motor to promote the electrical safety distance of motor. As shown in fig. 3 to 4, taking the first insulating frame 33 as an example, the first insulating frame 33 includes a frame body 332 and a frame retainer 331, the frame retainer 331 is connected to the frame body 332, and the frame retainer 331 protrudes toward a side away from the core unit 311 in an axial direction of the core unit 311.

A stator structure for an electric motor according to a specific example of the present invention is described below.

The stator structure includes: a plurality of iron core units 311, first insulating frame 33 and second insulating frame 34, a plurality of iron core units 311 are along the circumference end to end concatenation of motor in order to form annular stator core 31, and every iron core unit 311 includes: the tooth-shaped structure comprises a yoke portion 313, a first half-tooth portion 3121, a second half-tooth portion 3122 and five full-tooth portions 315, wherein the first half-tooth portion 3121 is arranged at one end of the yoke portion 313, the second half-tooth portion 3122 is arranged at the other end of the yoke portion 313, a groove is arranged on the first half-tooth portion 3121, a protrusion is arranged on the second half-tooth portion 3122, the groove and the protrusion are both in a dovetail shape, and the five full-tooth portions 315 are arranged between the first half-tooth portion 3121 and the second half-tooth portion 3122. In the axial direction of the core unit 311, the axial height of the projection is equal to the axial height of the half-tooth portion 312, and the axial height of the groove is equal to the axial height of the half-tooth portion 312. The circumferential width of the protrusion or the groove is C, the circumferential width of the full tooth portion 315 is D, the radial width of the yoke portion 313 is E, the radial width of the core unit 311 is F, the inner radius of the core unit 311 is R1, the outer radius of the core unit 311 is R2, C =1mm, D =5mm, E =2.6mm, F =6.4mm, and R1/R2=0.8. The first insulating frame 33 is fixed to one axial end of the stator core 31, and the second insulating frame 34 is fixed to the other axial end of the stator core 31. The first insulating frame 33 and the second insulating frame 34 each have an embedding portion 333, the embedding portion 333 is embedded between two adjacent full-tooth portions 315, and the embedding portion 333 has a winding avoiding groove 35. The first insulating frame 33 includes a frame body 332 and a frame retainer 331, the frame retainer 331 is connected to the frame body 332, and the frame retainer 331 protrudes toward a side away from the core unit 311 in an axial direction of the core unit 311.

According to the utility model discloses electric machine of second aspect embodiment, including the aforesaid a stator structure for electric machine.

According to the utility model discloses fan of third aspect embodiment, including flabellum and foretell motor, the flabellum by motor drive rotates.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to 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 are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (16)

1. A stator structure for an electric machine, comprising: a plurality of iron core units, it is a plurality of the iron core unit is followed the circumference end to end concatenation of motor is in order to form annular stator core, every the iron core unit includes: the half tooth parts are respectively arranged at two ends of the yoke part, each half tooth part is provided with a connecting part, and the adjacent two half tooth parts in the two iron core units are connected through the respective connecting parts in the circumferential direction.

2. The stator structure for electric machines according to claim 1, wherein the core unit further comprises: and the full tooth part is arranged between the two half tooth parts at the two ends of the yoke part.

3. The stator structure for an electric motor according to claim 2, wherein the two half teeth portions are connected by the respective connecting portions to form one full tooth portion.

4. The stator structure for electric machines according to claim 1, wherein one of the half-teeth portions of the core unit is provided with a groove and the other half-teeth portion is provided with a projection, wherein the groove and the projection are configured as the connecting portion.

5. The stator structure for electric motor according to claim 4, wherein each of the half-tooth portions has a connection side surface adapted to be connected to another adjacent half-tooth portion, and the groove is recessed from the connection side surface or the protrusion is protruded from the connection side surface.

6. The stator structure for electric motors of claim 5, wherein the groove or the projection is located at a middle position of the corresponding connection side in a radial direction of the electric motor.

7. The stator structure for an electric motor according to claim 4, wherein two axial end faces of the projection are flush with two axial end faces of the corresponding half tooth portions, respectively; the grooves extend along the axial direction of the motor and penetrate through two axial end faces of the corresponding half tooth parts.

8. The stator structure for an electric motor according to claim 4, wherein the opening width of the groove is smaller than the width of the root of the groove, and the projection is adapted to the shape of the groove.

9. The stator structure for an electric motor according to claim 2 or 3, wherein a ratio of a radial width of the yoke portion to a circumferential width of the full tooth portion ranges from: 1/2-2/3.

10. The stator structure for an electric motor according to claim 2 or 3, wherein a ratio range of the circumferential width of the connecting portion and the circumferential width of the full tooth portion is: 0.15 to 0.4.

11. The stator structure for an electric motor according to claim 2 or 3, wherein a radial width of the core unit is F, a circumferential width of the full tooth is D, a radial width of the yoke portion is E, and D, E, F satisfy the relation: e +0.5D is less than or equal to F and less than or equal to E + D.

12. The stator structure for an electric motor according to claim 1, wherein the core unit has a circular arc-shaped structure, and a ratio range of an inner diameter of the core unit to an outer diameter of the core unit is: 0.6 to 0.95.

13. The stator structure for an electric motor according to claim 2 or 3, further comprising an annular insulating frame fixed to both axial ends of the stator core, the insulating frame having an embedded portion embedded between at least two adjacent full teeth portions, the embedded portion having a winding escape slot.

14. The stator structure for an electric machine according to claim 13, wherein the insulating frame of at least one end has a frame collar that projects toward a side facing away from the core unit in an axial direction of the stator core.

15. An electrical machine, characterized in that it comprises a stator structure for an electrical machine according to any one of claims 1-14.

16. A fan comprising a fan blade and the motor of claim 15, the fan blade being driven for rotation by the motor.

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