CN216356128U

CN216356128U - Stator module, motor and electrical equipment

Info

Publication number: CN216356128U
Application number: CN202123185227.2U
Authority: CN
Inventors: 葛梦; 冯艳丽; 李文瑞
Original assignee: Midea Welling Motor Technology Shanghai Co Ltd; Welling Wuhu Motor Manufacturing Co Ltd
Current assignee: Midea Welling Motor Technology Shanghai Co Ltd; Welling Wuhu Motor Manufacturing Co Ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-04-19
Anticipated expiration: 2031-12-17

Abstract

The utility model provides a stator assembly, a motor and electrical equipment, wherein the stator assembly comprises: stator core, stator core include yoke portion and stator owner tooth, and stator owner tooth includes: the tooth root of the tooth body is connected with the yoke part; the tooth boot is arranged at the tooth top of the tooth body, a first auxiliary tooth and a second auxiliary tooth are arranged on the tooth boot, and a groove is formed between the first auxiliary tooth and the second auxiliary tooth; the winding is arranged on the stator main teeth; wherein, the tooth boots are asymmetrically arranged about the bisector of the tooth body. According to the utility model, the first auxiliary tooth and the second auxiliary tooth are used as modulation parts to realize the function of magnetic field modulation; in addition, the tooth boots are asymmetrically arranged about the tooth body bisector of the tooth body, the air gap magnetic conductance distribution is changed, and partial harmonic waves are weakened, so that the torque pulsation is reduced, and the vibration noise performance of the motor applying the stator assembly is improved.

Description

Stator module, motor and electrical equipment

Technical Field

The utility model relates to the technical field of electric appliances of motors, in particular to a stator assembly, a motor and electric equipment.

Background

In the related art, the motor adopts a built-in rotor structure to improve the intensity of a fundamental wave air gap magnetic field so as to improve the efficiency of the motor. However, in the structure, the fundamental wave magnetic field strength is further improved, so that the motor cost is increased or the vibration noise performance of the motor is deteriorated, and the reliability of the motor is affected; in addition, the fundamental wave magnetic field intensity is increased to a limited extent, and the motor performance improvement space is small.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art.

To this end, a first aspect of the utility model provides a stator assembly.

A second aspect of the utility model provides an electric machine.

A third aspect of the utility model provides an electrical appliance.

A first aspect of the utility model provides a stator assembly comprising: stator core, stator core include yoke portion and stator owner tooth, and stator owner tooth includes: the tooth root of the tooth body is connected with the yoke part; the tooth boot is arranged at the tooth top of the tooth body, a first auxiliary tooth and a second auxiliary tooth are arranged on the tooth boot, and a groove is formed between the first auxiliary tooth and the second auxiliary tooth; the winding is arranged on the stator main teeth; wherein, the tooth boots are asymmetrically arranged about the bisector of the tooth body.

The stator assembly provided by the utility model comprises a stator core and a winding. The stator core comprises a yoke portion and stator main teeth arranged on the yoke portion. The stator main teeth comprise tooth bodies and tooth shoes; the tooth root of tooth body is connected with yoke portion, and the tooth top of tooth body is provided with the tooth boots. In addition, the winding sets up on stator owner tooth, and the tooth boots can play certain limiting displacement to the winding to guarantee that the winding is stable on stator owner tooth.

Furthermore, in the stator assembly provided by the utility model, the tooth shoe is provided with a first auxiliary tooth and a second auxiliary tooth, the first auxiliary tooth and the second auxiliary tooth are distributed on the tooth shoe at intervals, and a groove is formed between the first auxiliary tooth and the second auxiliary tooth. In this way, the first and second sub-teeth function as a magnetic conductive member and a modulating member to modulate a magnetic field. At this time, unlike the conventional permanent magnet motor employed in the related art (slot opening is small, air gap permeance is close to constant). In the stator assembly provided by the utility model, the stator main tooth is at least split into the first secondary tooth and the second secondary tooth, so that more harmonic components are introduced into the air gap permeance. Thus, the performance of the motor applying the stator assembly is obviously improved.

Further, the present invention provides a stator assembly wherein the tooth shoes are asymmetrically disposed about a body bisector of the tooth body such that the tooth shoes or the pockets are offset toward one side of the body bisector of the tooth body. Therefore, the air gap magnetic conductance distribution can be changed, partial harmonic waves are weakened, torque pulsation is reduced, and the vibration noise performance of a motor applying the stator assembly is improved.

Therefore, in the stator assembly provided by the utility model, the tooth shoe of the stator main tooth is at least provided with the first auxiliary tooth and the second auxiliary tooth, and further the first auxiliary tooth and the second auxiliary tooth are used as modulation components, so that the effect of magnetic field modulation is realized, more harmonic components are introduced into air gap magnetic conductance, and the performance of a motor applying the stator assembly is obviously improved. And the tooth boots are asymmetrically arranged about the tooth body bisector of the tooth body, so that the tooth boots or the grooves deviate towards one side of the tooth body bisector of the tooth body, the air gap magnetic conductance distribution is further changed, partial harmonic waves are weakened, the torque pulsation is reduced, and the vibration noise performance of the motor using the stator assembly is improved.

In some possible designs, the distance from the two side walls of the groove to the bisector of the tooth body is unequal in the circumferential direction of the stator assembly.

In this design, the distances from the two side walls of the groove to the tooth body bisector of the tooth body are different in the circumferential direction of the stator assembly. That is, the groove in the motor provided by the utility model is offset towards one side of the tooth body bisector of the tooth body, so that the tooth shoes are arranged asymmetrically relative to the tooth body bisector of the tooth body. Therefore, the motor using the stator component can realize the magnetic field modulation effect, generate and use more working harmonics, and further improve the output torque of the motor. In addition, the torque pulsation can be reduced, so that the running stability of the motor applying the stator assembly is improved, and the running vibration and noise of the motor are reduced.

In some possible designs, the distance from the two ends of the tooth shoe to the tooth body bisector of the tooth body varies in the circumferential direction of the stator assembly.

In this design, the distances from the two ends of the tooth shoe to the tooth body bisector of the tooth body are different in the circumferential direction of the stator assembly. That is, the tooth shoe in the motor provided by the utility model is offset towards one side of the tooth body bisector of the tooth body, so that the tooth shoe is asymmetrically arranged relative to the tooth body bisector of the tooth body. Therefore, the motor using the stator component can realize the magnetic field modulation effect, generate and use more working harmonics, and further improve the output torque of the motor. In addition, the torque pulsation can be reduced, so that the running stability of the motor applying the stator assembly is improved, and the running vibration and noise of the motor are reduced.

In some possible designs, the number of the stator main teeth is at least two, a notch is formed between the adjacent first secondary teeth and the second secondary teeth, and the distances from the angular bisector of an included angle formed between the bisectors of the tooth bodies of the adjacent two tooth bodies to the first secondary teeth and the second secondary teeth are different at the notch.

In this design, the number of stator main teeth is at least two. And in two adjacent stator main teeth, a notch is formed between the first auxiliary tooth of one stator assembly and the second auxiliary tooth of the other stator main tooth, and the notch can be used for a worker to wind a winding on the tooth body of the stator main tooth. In addition, at the notch, the distance from the angular bisector of an included angle formed between the bisectors of the tooth bodies of two adjacent tooth bodies to the first auxiliary tooth and the second auxiliary tooth is unequal.

That is, in the motor provided by the present invention, the notch is disposed offset from an angle bisector of an angle formed between bisectors of the tooth bodies of two adjacent tooth bodies, so as to realize an asymmetric arrangement of the tooth shoe with respect to the bisector of the tooth body. Therefore, the motor using the stator component can realize the magnetic field modulation effect, generate and use more working harmonics, and further improve the output torque of the motor. In addition, the torque pulsation can be reduced, so that the running stability of the motor applying the stator assembly is improved, and the running vibration and noise of the motor are reduced.

In some possible designs, the size of the slot is not equal to the size of the groove in the circumferential direction of the stator assembly.

In this design, the size of the slot and the size of the groove are not equal in the circumferential direction of the stator assembly. In this way, the uniformity of the distribution of the stator secondary teeth (which include at least the first secondary tooth and the second secondary tooth) over the circumference is changed, i.e. the period number of the permeance of the air gap is reduced, and the working harmonics of the air gap flux density are the pole pair numbers: l Pr ± i × Zf | (i ═ 0, 1, 2 … …), Zf being the number of permeance cycles of the air gap; when the number of the permeance cycles of the air gap is reduced, the flux density harmonic component generated by modulation is increased, namely more working harmonics are generated, so that the output torque of the motor is further improved.

In some possible designs, the size of the slot is smaller than the size of the groove in the circumferential direction of the stator assembly.

In this design, the size of the slot is smaller than the size of the groove in the circumferential direction of the stator assembly. Thus, the distribution of the first secondary tooth and the second secondary tooth on the circumference is further optimized, the periodicity of the air gap permeance is further reduced, the generated working harmonic wave is more, and the output torque of the motor can be further improved.

In some possible designs, the yoke is annular and the roots of the stator teeth are connected to the outer peripheral wall of the yoke.

In this design, the yoke is annular. Further, the tooth root of the stator main tooth is connected to the outer peripheral wall of the yoke. Therefore, the stator assembly provided by the utility model is an inner stator and can be matched with an outer rotor for use to output torque.

In some possible designs, the angle β formed by the bisector of the tooth body of the first secondary tooth and the bisector of the tooth body of the second secondary tooth satisfies: 1 ≦ β/(2 π/(ax)) < 1.4, wherein a represents the number of stator primary teeth, x represents the number of stator secondary teeth per stator primary tooth, and the stator secondary teeth comprise a first secondary tooth and a second secondary tooth.

In the design, an included angle beta formed by a bisector of the tooth body of the first auxiliary tooth and a bisector of the tooth body of the second auxiliary tooth meets the following requirements: 1 ≦ β/(2 π/(ax)) < 1.4, wherein a represents the number of stator primary teeth, x represents the number of stator secondary teeth per stator primary tooth, and the stator secondary teeth comprise a first secondary tooth and a second secondary tooth. Therefore, the structure and distribution of the stator secondary teeth are further optimized, so that the harmonic amplitude generated by the motor modulation using the stator component is larger, the torque is higher, and the working efficiency of the motor is further improved.

In some possible designs, the stator core comprises at least two stacks, each stack comprising a yoke section and a stator main tooth, the stator main tooth being disposed on the yoke section, the yoke sections of two adjacent stacks being connected, the yoke comprising a plurality of yoke sections.

In this design, the stator core includes at least two stacked bodies, and the stator core is manufactured by stacking the at least two stacked bodies. In this way, during the manufacturing process of the stator core, a worker can perform a winding operation or the like on the single stacked body. Compared with the prior art in which winding operation needs to be performed on the integral iron core, the stacked body provided by the utility model has the advantages that the operation space is more large, the winding difficulty is favorably reduced, the winding working efficiency is further improved, and the material cost is reduced.

In addition, the utility model can firstly perform operations such as winding on a single stacked body, can effectively increase the winding quantity of the winding, increase the slot fullness rate of the winding and improve the output performance of the applied motor. Moreover, on the basis of reducing the winding difficulty, the rejection rate in the winding process can be reduced, so that the waste is reduced, and the cost rate of the stator core is improved. In addition, the requirement of the single stacked body on the material is low, the utilization rate of the iron core material can be improved, and the material cost of the stator iron core is further reduced.

In some possible designs, the yoke sections of two adjacent stacks are detachably connected.

In this design, the yoke sections of two adjacent stacks can be detachably connected, thereby ensuring the disassembly and assembly of two adjacent stacks.

Specifically, the stator core further includes a first connection portion and a second connection portion. The first connecting part is arranged at the first end of the yoke section, the first connecting part is arranged at the second end of the yoke section, and the first end and the second section are oppositely arranged on the yoke section. And, the structure phase-match of first connecting portion and second connecting portion, the auto-lock can be realized in first connecting portion and the cooperation of second connecting portion. Thus, during splicing of stacks, the utility model may connect two adjacent stacks by means of a first connection and a second connection, including a detachable connection of two adjacent stacks.

In this design, one of the first and second connection portions is a convex portion, and the other is a concave portion. In addition, the shape of the convex part is matched with that of the concave part, the convex part and the concave part can be detachably connected, and the self-locking function is realized. Specifically, the concave portion includes, but is not limited to, polygonal grooves, circular grooves, elliptical grooves; the shape of the convex portion matches the shape of the concave portion.

In some possible designs, the stator assembly further comprises a fixture by which two adjacent stacks are fixed.

In this design, the stator assembly further includes a fixture. Wherein. After the splicing of the two adjacent stacked bodies is completed, the whole structure is further fixed through the fixing piece, and the structural stability of the spliced stacked bodies is further improved. Specifically, the fixing piece can adopt an insulating frame, so that the insulating frame can fix the stacked body on the basis of ensuring insulation, and the multipurpose of the insulating frame is realized.

In some possible designs, two adjacent stacks are welded together.

In this design, two adjacent stacks are welded together. Wherein. After the splicing of the two adjacent stacked bodies is completed, the whole structure is further fixed in a welding mode, and the structural stability of the spliced stacked bodies is further improved.

In some possible designs, two adjacent stacks are injection molded in one piece.

In this design, two adjacent stacks are injection molded in one piece. That is, after the splicing of two adjacent stacked bodies is completed, the whole structure is further fixed in an integral injection molding mode, and the structural stability of the spliced stacked bodies is further improved.

In some possible designs, the root of the tooth body is removably connected to the yoke portion.

In the design, the tooth body of the stator main tooth is detachably connected with the yoke part. Like this, in stator core's manufacturing process, can wind earlier on the single pile body that contains stator owner tooth, then install yoke portion again, the wire winding of being convenient for on the one hand improves the motor groove fullness rate, and on the other hand can increase tooth boots circumference width, reduces the notch width to avoid the too big influence that causes the motor performance of notch.

In some possible designs, the tooth top of the tooth body is detachably connected with the tooth shoe.

In the design, the tooth shoe is detachably connected with the tooth body of the stator main tooth. Like this, in stator core's manufacturing process, can wind earlier on the single pile body that contains stator owner tooth, then install tooth boots, the wire winding of being convenient for on the one hand improves the full rate of motor groove, and on the other hand can increase tooth boots circumference width, reduces the notch width to avoid the too big influence that causes the motor performance of notch.

A second aspect of the present invention provides an electric machine comprising: a stator assembly according to the first aspect of the utility model; the rotor subassembly, the rotor subassembly includes rotor core and a plurality of permanent magnet, and a plurality of permanent magnet set up on rotor core to interval distribution on rotor core's circumferencial direction, the magnetic pole of two adjacent permanent magnets is different.

The electrical machine proposed by the present invention comprises a stator assembly according to the first aspect of the present invention. Thus, the overall benefits of the stator assembly described above are provided and will not be discussed in detail herein.

In addition, the electric machine further includes a rotor assembly. Wherein the rotor assembly comprises a rotor core and a plurality of permanent magnets; the plurality of permanent magnets are arranged on the rotor core and distributed at intervals in the circumferential direction of the rotor core, and in addition, the polarities of the adjacent permanent magnets are different. During operation of the motor, the rotor assembly can be matched with the stator assembly and output torque.

In some possible designs, at least a portion of the stator assembly is located inside the rotor assembly.

In this design, at least a portion of the stator assembly is located inside the rotor assembly. At this time, the stator assembly is used as an inner stator, and the rotor assembly is used as an outer rotor. Further, the permanent magnets are retained on an inner surface of the rotor core with at least a portion of the stator assembly located inside the rotor assembly. The permanent magnetic pole can be composed of a plurality of permanent magnets with two transverse edges and approximately arc-shaped inner surfaces and outer surfaces, and can also be an integrally formed magnetic ring. Alternatively, the permanent magnet material may be ferrite, plastic magnet, rare earth permanent magnet, or rubber magnetic strip.

In some possible designs, at least a portion of the rotor assembly is located inside the stator assembly.

In this design, at least a portion of the rotor assembly is located inside the stator assembly. In this case, the rotor assembly serves as a rotor stator, and the stator assembly serves as an outer stator. Further, with at least a portion of the rotor assembly located inside the stator assembly, the permanent magnets forming the permanent magnet poles are placed on the outer surface or inside of the rotor core, or inside the core, such as a V-shape, a spoke-shape, or the like.

In some possible designs, the number of pole pairs Ps of the winding satisfies: ps ═ ax ± Pr |, a denotes the number of stator primary teeth, x denotes the number of stator secondary teeth on each stator primary tooth, Pr denotes the number of pole pairs of the plurality of permanent magnets, wherein the stator secondary teeth include first secondary teeth and second secondary teeth.

In this design, the number of pole pairs Ps of the winding satisfies: ps ═ ax ± Pr |, a denotes the number of stator primary teeth, x denotes the number of stator secondary teeth on each stator primary tooth, Pr denotes the number of pole pairs of the plurality of permanent magnets, wherein the stator secondary teeth include first secondary teeth and second secondary teeth. Under the limitation, new harmonic components in the air gap flux density can be used as working harmonics of the motor to provide output torque for the motor, so that the torque density of the motor is effectively improved.

A third aspect of the present invention provides an electric apparatus, comprising: the electric machine according to the second aspect of the utility model.

The electrical apparatus proposed by the present invention comprises the motor according to the second aspect of the present invention. Thus, the overall benefits of the motor described above are achieved and will not be discussed in detail here.

Specifically, the electrical equipment provided by the utility model can be products such as refrigerators, washing machines, air conditioners and the like.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

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

figure 1 is one of the structural schematic views of a stator core in a stator assembly in accordance with one embodiment of the present invention;

figure 2 is a second schematic view of the structure of the stator core of the stator assembly of one embodiment of the present invention;

figure 3 is a third schematic view of the construction of the stator core in the stator assembly of one embodiment of the present invention;

FIG. 4 is a schematic diagram of the construction of a single stack in the stator core shown in FIG. 3;

figure 5 is a schematic structural view of a single stack of stator cores in a stator assembly in accordance with yet another embodiment of the present invention

Figure 6 is a fourth schematic view of the structure of the stator core in the stator assembly of one embodiment of the present invention;

fig. 7 is a fifth structural schematic view of a stator core in a stator assembly in accordance with an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of an electric machine according to one embodiment of the present invention;

FIG. 9 is a schematic structural view of a rotor assembly of the motor of FIG. 8;

FIG. 10 is a schematic illustration of the effect of the dimensions of L1 and L2 on motor performance in a motor of one embodiment of the present invention;

FIG. 11 is a schematic illustration of the effect of the dimensions of L3 and L4 on motor performance in a motor of one embodiment of the present invention;

FIG. 12 is a schematic illustration of the effect of the dimensions of d1 and d2 on motor performance in a motor according to one embodiment of the present invention;

FIG. 13 is one of the schematic illustrations of the effect of the dimensions of d3 and d4 on motor performance in a motor of one embodiment of the present invention;

FIG. 14 is a second schematic illustration of the effect of the dimensions of d3 and d4 on motor performance in a motor in accordance with an embodiment of the present invention;

fig. 15 is a schematic illustration of the effect of included angle β on motor performance in a motor according to one embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 15 is:

102 stator core, 104 yoke, 106 stator main teeth, 108 tooth body, 110 tooth shoe, 112 first secondary tooth, 114 second secondary tooth, 116 groove, 118 notch, 120 stator slot, 122 stack, 124 yoke section, 126 first connection, 128 second connection, 200 rotor assembly, 202 rotor core, 204 permanent magnet.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.

Stator assemblies, motors, and electrical devices provided according to some embodiments of the present invention are described below with reference to fig. 1-15.

As shown in fig. 1 and 2, a stator assembly according to a first embodiment of the present invention includes a stator core 102 and windings. The stator core 102 includes a yoke portion 104 and a stator main tooth 106 disposed on the yoke portion 104. Stator main teeth 106 include a tooth body 108 and a tooth shoe 110; the root of the body 108 is connected to the yoke 104, and the tip of the body 108 is provided with a tooth shoe 110. In addition, the winding is arranged on the stator main tooth 106, and the tooth shoe 110 can play a certain limiting role on the winding to ensure that the winding is stably arranged on the stator main tooth 106.

Further, as shown in fig. 1 and 2, in the stator assembly according to the present invention, the tooth shoe 110 is provided with a first pair of teeth 112 and a second pair of teeth 114, the first pair of teeth 112 and the second pair of teeth 114 are spaced apart from each other on the tooth shoe 110, and a groove 116 is formed between the first pair of teeth 112 and the second pair of teeth 114. In this way, the first and

second sub-teeth

112 and 114 function as a magnetic conductive member, and also function as a modulation member, thereby achieving a magnetic field modulation effect.

At this time, unlike the conventional permanent magnet motor employed in the related art (slot opening is small, air gap permeance is close to constant). In the stator assembly proposed by the present invention, the stator main tooth 106 is split into at least a first secondary tooth 112 and a second secondary tooth 114, so that more harmonic components are introduced into the air gap permeance. Thus, the performance of the motor applying the stator assembly is obviously improved.

Further, as shown in fig. 1 and 2, the present invention proposes a stator assembly in which the tooth shoe 110 is disposed asymmetrically with respect to a tooth body bisector of the tooth body 108 such that the tooth shoe 110 or the groove 116 is offset toward one side of the tooth body bisector of the tooth body 108. Therefore, the air gap magnetic conductance distribution can be changed, partial harmonic waves are weakened, torque pulsation is reduced, and the vibration noise performance of a motor applying the stator assembly is improved.

Therefore, as shown in fig. 1 and fig. 2, in the stator assembly provided by the present invention, at least the first secondary tooth 112 and the second secondary tooth 114 are disposed on the tooth shoe 110 of the stator main tooth 106, and further, the first secondary tooth 112 and the second secondary tooth 114 are used as modulation components to realize the effect of magnetic field modulation, so that more harmonic components are introduced into the air gap flux guide, and the performance of the motor using the stator assembly is significantly improved. In addition, the tooth shoe 110 is asymmetrically arranged about the tooth body bisector of the tooth body 108, so that the tooth shoe 110 or the groove 116 deviates towards one side of the tooth body bisector of the tooth body 108, the air gap magnetic conductance distribution is further changed, partial harmonic waves are weakened, torque pulsation is reduced, and the vibration noise performance of the motor applying the stator assembly is improved.

A second embodiment of the present invention provides a stator assembly, further comprising, based on the first embodiment:

as shown in fig. 2, the distance from the two side walls of the groove 116 to the tooth body bisector of the tooth body 108 varies in the circumferential direction of the stator assembly. That is, the present invention proposes a motor in which the groove 116 is offset toward one side of the body bisector of the tooth body 108 to achieve an asymmetrical arrangement of the tooth shoe 110 about the body bisector of the tooth body 108.

Therefore, the motor using the stator component can realize the magnetic field modulation effect, generate and use more working harmonics, and further improve the output torque of the motor. In addition, the torque pulsation can be reduced, so that the running stability of the motor applying the stator assembly is improved, and the running vibration and noise of the motor are reduced.

It should be noted that, in this embodiment, at the notch 118, the distance from the bisector of the included angle formed between the bisectors of the two adjacent tooth bodies 108 to the first secondary tooth 112 and the second secondary tooth 114 may be equal or different. In this way, the tooth shoe 110 is arranged asymmetrically with respect to the tooth body bisector of the tooth body 108.

Specifically, as shown in fig. 1, the distance from the first side wall of the groove 116 to the body bisector of the body 108 is L1, the distance from the second side wall of the groove 116 to the body bisector of the body 108 is L2, and L1 ≠ L2. The first side wall is a side wall of the groove 116 near the first secondary tooth 112, and the second side wall is a side wall of the groove 116 near the second secondary tooth 114.

Specifically, as shown in fig. 10, in the stator assembly proposed by the present invention, the distance from the first side wall of the groove 116 to the tooth body bisector of the tooth body 108 is L1, the distance from the second side wall of the groove 116 to the tooth body bisector of the tooth body 108 is L2, and L1 ≠ L2, which can significantly attenuate harmonics and reduce the cogging torque of the motor, improving the performance of the motor. In fig. 10, the abscissa represents the electrical angle of the motor, the ordinate represents the cogging torque (Nm) of the motor, Q1 represents a correlation parameter when L1 is L2, and Q2 represents a correlation parameter when L1 is L2.

A third embodiment of the present invention provides a stator assembly, further comprising, based on the first and second embodiments:

the distances from the two ends of the tooth shoe 110 to the tooth body bisector of the tooth body 108 in the circumferential direction of the stator assembly are unequal. That is, the present invention proposes a motor in which the tooth shoe 110 is offset toward one side of the body bisector of the tooth body 108 to achieve an asymmetrical arrangement of the tooth shoe 110 with respect to the body bisector of the tooth body 108.

In addition, in this embodiment, the distances from the two side walls of the groove 116 to the tooth body bisector of the tooth body 108 in the circumferential direction of the stator assembly may be equal or different. In this way, the tooth shoe 110 is arranged asymmetrically with respect to the tooth body bisector of the tooth body 108.

Specifically, as shown in fig. 1, the distance from the first end of the tooth shoe 110 to the body bisector of the tooth body 108 is L3, the distance from the second end of the tooth shoe 110 to the body bisector of the tooth body 108 is L4, and L3 ≠ L4.

Specifically, as shown in fig. 11, in the stator assembly proposed by the present invention, the distance from the first end of the tooth shoe 110 to the bisector of the tooth body 108 is L3, the distance from the second end of the tooth shoe 110 to the bisector of the tooth body 108 is L4, and L3 ≠ L4, which can significantly attenuate harmonics and reduce the cogging torque of the motor, improving the performance of the motor. In fig. 11, the abscissa represents the electrical angle of the motor, the ordinate represents the cogging torque (Nm) of the motor, Q3 represents a correlation parameter when L3 is L4, and Q4 represents a correlation parameter when L3 is L4.

A fourth embodiment of the present invention provides a stator assembly, further comprising, based on the first, second and third embodiments:

as shown in fig. 1, the number of stator main teeth 106 is at least two. Wherein, in two adjacent stator main teeth 106, a notch 118 is arranged between the first secondary tooth 112 of one stator component and the second secondary tooth 114 of the other stator main tooth 106, and the notch 118 can be used for workers to wind the winding on the tooth body 108 of the stator main tooth 106. In addition, at the notch 118, the angle bisector of the included angle formed between the body bisectors of two adjacent tooth bodies 108 has different distances to the first secondary tooth 112 and the second secondary tooth 114.

That is, in the motor proposed in the present embodiment, the notch 118 is disposed offset from an angle bisector of an angle formed between the tooth body bisectors of two adjacent tooth bodies 108, so as to realize the asymmetrical disposition of the tooth shoe 110 with respect to the tooth body bisector of the tooth body 108. Therefore, the motor using the stator component can realize the magnetic field modulation effect, generate and use more working harmonics, and further improve the output torque of the motor. In addition, the torque pulsation can be reduced, so that the running stability of the motor applying the stator assembly is improved, and the running vibration and noise of the motor are reduced.

It should be noted that, in this embodiment, the distances from the two sidewalls of the groove 116 to the bisector of the tooth body 108 may be equal or different. In this way, the tooth shoe 110 is arranged asymmetrically with respect to the tooth body bisector of the tooth body 108.

Specifically, as shown in fig. 1, the distance from the bisector of the angle formed between the bisectors of the two tooth bodies 108 to the first secondary tooth 112 is d1, the distance from the bisector of the angle formed between the bisectors of the two tooth bodies 108 to the second secondary tooth 114 is d2, and d1 ≠ d 2.

Specifically, as shown in fig. 12, the distance from the bisector of the angle formed between the bisectors of the two tooth bodies 108 to the first sub-tooth 112 is d1, the distance from the bisector of the angle formed between the bisectors of the two tooth bodies 108 to the second sub-tooth 114 is d2, and d1 ≠ d2, which can significantly attenuate harmonics and reduce the cogging torque of the motor, improving the performance of the motor. In fig. 12, the abscissa represents the electrical angle of the motor, the ordinate represents the cogging torque (Nm) of the motor, Q5 represents a correlation parameter when d1 is d2, and Q6 represents a correlation parameter when d1 is d 2.

A fifth embodiment of the present invention provides a stator assembly, further comprising, based on the first, second, third and fourth embodiments:

as shown in fig. 1 and 2, the size of the slot 118 is different from the size of the groove 116 in the circumferential direction of the stator assembly. In this way, the uniformity of the distribution of the stator secondary teeth (which include at least the first secondary tooth 112 and the second secondary tooth 114) over the circumference is varied, i.e. the number of periods of the permeance of the air gap is reduced, and the number of pole pairs of the working harmonics of the air gap flux density is: l Pr ± i × Zf | (i ═ 0, 1, 2 … …), Zf being the number of permeance cycles of the air gap; when the number of the permeance cycles of the air gap is reduced, the flux density harmonic component generated by modulation is increased, namely more working harmonics are generated, so that the output torque of the motor is further improved.

In this embodiment, further, as shown in fig. 1 and 2, the size of the slot 118 is smaller than the size of the groove 116 in the circumferential direction of the stator assembly. Thus, the present invention further optimizes the circumferential distribution of the first secondary tooth 112 and the second secondary tooth 114 to further reduce the number of periods of air gap permeance, thereby generating more operating harmonics and further increasing the output torque of the electric machine.

Specifically, as shown in fig. 1 and 2, the slot 118 has a dimension d3 in the circumferential direction of the stator assembly and the groove 116 has a dimension d4 in the circumferential direction of the stator assembly; and d3 < d 4.

Specifically, as shown in fig. 13, in the stator assembly proposed by the present invention, the size of the notch 118 is d3 in the circumferential direction of the stator assembly, the size of the groove 116 is d4 in the circumferential direction of the stator assembly, and d3 < d4 is satisfied, so that harmonics can be significantly attenuated, the cogging torque of the motor can be reduced, and the performance of the motor can be improved. Specifically, in fig. 13, the abscissa indicates the number of times, the ordinate indicates the no-load air gap flux density ramp-T, the filled bars indicate the correlation parameters when d3 ≠ d4, and the blank bars indicate the correlation parameters when d3 ≠ d 4. As shown in fig. 13, after d3 ≠ d4, the period number of the gap permeance is reduced, and the working harmonics of the gap permeance are the pole pair number: l Pr ± i × Zf | (i ═ 0, 1, 2 … …), Zf being the number of permeance cycles of the air gap; when the number of the permeance cycles of the air gap is reduced, the flux density harmonic component generated by modulation is increased. Such as 4/8/16 subharmonics.

Specifically, as shown in fig. 14, the size of the notch 118 is d3 in the circumferential direction of the stator assembly, the size of the groove 116 is d4 in the circumferential direction of the stator assembly, and d3 < d4 is satisfied, so that harmonics can be significantly attenuated, the cogging torque of the motor can be reduced, and the performance of the motor can be improved. In fig. 14, the abscissa represents the electrical angle of the motor, the ordinate represents the no-load back-emf — V, Q7 represents the relevant parameter when d3 ≠ d4, and Q8 represents the relevant parameter when d3 ≠ d 4; as shown in fig. 14, the output counter electromotive force of the motor of the present invention is further increased, and thus the torque is increased.

A sixth embodiment of the present invention provides a stator assembly, further comprising, based on the first, second, third, fourth and fifth embodiments:

as shown in fig. 1 and 2, the bisector of the tooth body of the first secondary tooth 112 forms an included angle β with the bisector of the tooth body of the second secondary tooth 114, which satisfies: 1 ≦ β/(2 π/(ax)) < 1.4, where a represents the number of stator main teeth 106 and x represents the number of stator secondary teeth on each stator main tooth 106, including first secondary tooth 112 and second secondary tooth 114.

Therefore, the structure and distribution of the stator secondary teeth are further optimized, so that the harmonic amplitude generated by the motor modulation using the stator component is larger, the torque is higher, and the working efficiency of the motor is further improved.

Specifically, as shown in fig. 15, in the stator assembly proposed by the present invention, an included angle β is formed between a bisector of the first secondary tooth 112 and a bisector of the second secondary tooth 114, which satisfies: beta/(2 pi/(ax)) < 1.4 is not less than 1, so that the efficiency of the motor can be obviously improved, and the efficiency advantage of the motor is more obvious. In fig. 15, the abscissa represents the value of β/(2 pi/(ax)), the ordinate represents the motor efficiency, and the curve Q9 represents the relevant parameter of the motor efficiency.

A seventh embodiment of the present invention provides a stator assembly, further comprising, based on the first, second, third, fourth, fifth and sixth embodiments:

as shown in fig. 3, 4 and 5, the stator core 102 includes at least two stacks 122, and the stator core 102 is manufactured in such a manner that the at least two stacks 122 are stacked. In this way, during the manufacturing process of the stator core 102, a worker may first perform a winding operation or the like on the single stacked body 122. Compared with the prior art that the winding operation needs to be carried out on the integral iron core, the stacked body 122 provided by the utility model has more operation space, is beneficial to reducing the winding difficulty, further improves the winding working efficiency and reduces the material cost.

In addition, the utility model can firstly perform operations such as winding on the single stacked body 122, can effectively increase the winding quantity of the winding, increase the slot filling rate of the winding and improve the output performance of the applied motor. Moreover, the utility model can reduce the rejection rate in the winding process on the basis of reducing the winding difficulty, thereby reducing the waste and improving the cost rate of the stator core 102. In addition, the individual stacks 122 have lower material requirements, which can improve the utilization of the core material and thus reduce the material cost of the stator core 102.

In this embodiment, further, as shown in fig. 3, 4 and 5, the yoke sections 124 of two adjacent stacks 122 are detachably connected, thereby ensuring the disassembly and assembly of two adjacent stacks 122. Specifically, the stator core 102 further includes a first connection portion 126 and a second connection portion 128. Wherein the first connection portion 126 is disposed at a first end of the yoke section 124, the first connection portion 126 is disposed at a second end of the yoke section 124, and the first end and the second end are oppositely disposed on the yoke section 124. Moreover, the structures of the first connecting portion 126 and the second connecting portion 128 are matched, and the first connecting portion 126 and the second connecting portion 128 are matched to realize self-locking. Thus, during splicing of the stacks 122, the present invention may connect adjacent two stacks 122 through the first connection 126 and the second connection 128, including the detachable connection of adjacent two stacks 122.

In this embodiment, as shown in fig. 3, 4 and 5, one of the first connecting portion 126 and the second connecting portion 128 is a convex portion, and the other is a concave portion. In addition, the shape of the convex part is matched with that of the concave part, the convex part and the concave part can be detachably connected, and the self-locking function is realized. Specifically, the concave portion includes, but is not limited to, polygonal grooves, circular grooves, elliptical grooves; the shape of the convex portion matches the shape of the concave portion.

Further, as shown in fig. 4 and 5, a single stack 122 may include one stator main tooth 106, or may include two or more stator main teeth 106.

An eighth embodiment of the present invention provides a stator assembly, and on the basis of the seventh embodiment, further:

the stator assembly further comprises a stator member (not shown in the figures). Wherein. After the splicing of two adjacent stacked bodies 122 is completed, the whole structure is further fixed by the fixing piece, and the structural stability of the spliced stacked bodies 122 is further improved. Specifically, the fixing member may adopt an insulating frame, so that the insulating frame can fix the stacked body 122 on the basis of ensuring insulation, thereby achieving the multi-purpose of the insulating frame.

In addition, two adjacent stacks 122 may also be welded. Wherein. After the splicing of two adjacent stacked bodies 122 is completed, the whole structure is further fixed in a welding mode, and the structural stability of the spliced stacked bodies 122 is further improved.

In addition, two adjacent stacks 122 may also be injection molded in one piece. That is, after the splicing of two adjacent stacked bodies 122 is completed, the entire structure is further fixed in an integral injection molding manner, so that the structural stability of the spliced stacked bodies 122 is further improved.

A ninth embodiment of the present invention provides a stator assembly, further comprising, based on the first, second, third, fourth, fifth, sixth, seventh and eighth embodiments:

as shown in fig. 6, the tooth body 108 of the stator main tooth 106 is detachably coupled to the yoke 104. In this way, during the manufacturing process of the stator core 102, the single stacked body 122 containing the stator main teeth 106 can be wound first and then mounted on the yoke portion 104, so that the winding is facilitated, the slot filling rate of the motor is improved, and the circumferential width of the tooth shoes 110 can be increased and the width of the notches 118 can be reduced, so that the influence of the overlarge notches 118 on the performance of the motor is avoided.

A tenth embodiment of the present invention provides a stator assembly, further comprising, based on the first, second, third, fourth, fifth, sixth, seventh, eighth and ninth embodiments:

as shown in fig. 7, the tooth shoe 110 is detachably connected to the tooth body 108 of the stator main tooth 106. In this way, during the manufacturing process of the stator core 102, the winding can be performed on the single stacked body 122 containing the stator main teeth 106, and then the tooth shoes 110 are installed, so that on one hand, the winding is facilitated, the slot fullness rate of the motor is improved, on the other hand, the circumferential width of the tooth shoes 110 can be increased, and the width of the slot 118 is reduced, so that the influence of the overlarge slot 118 on the performance of the motor is avoided.

In addition to any of the above embodiments, as shown in fig. 1 and 2, the yoke 104 is annular. Further, the tooth root of the stator main tooth 106 is connected to the outer circumferential wall of the yoke 104. Therefore, the stator assembly provided by the utility model is an inner stator and can be matched with an outer rotor for use to output torque.

On the basis of the above embodiment, it should be noted that if the distances from the two sidewalls of the groove 116 to the bisector of the tooth body 108 in the circumferential direction of the stator assembly are different, the distances from the bisector of the included angle formed between the bisectors of the tooth bodies 108 to the first secondary tooth 112 and the second secondary tooth 114 at the notch 118 may be equal or different.

On the basis of the above embodiment, it should be noted that if the distances from the first secondary tooth 112 and the second secondary tooth 114 to the angle bisector of the included angle formed between the tooth body bisectors of the two adjacent tooth bodies 108 at the notch 118 are different, the distances from both ends of the tooth shoe 110 to the tooth body bisector of the tooth body 108 in the circumferential direction of the stator assembly are different.

Therefore, in the stator assembly proposed by the present invention, it is only necessary to ensure that at least one of d1 ≠ d2 and L1 ≠ L2 is present.

As shown in fig. 8, an eleventh embodiment of the present invention provides an electric machine including a stator assembly, and a rotor assembly 200 as described in any of the above embodiments.

Therefore, the motor provided by the present embodiment has all the advantages of the stator assembly, and will not be discussed in detail herein.

Further, as shown in fig. 8 and 9, the motor further includes a rotor assembly. Wherein rotor assembly 200 includes a rotor core 202 and a plurality of permanent magnets 204; the plurality of permanent magnets 204 are provided on the rotor core 202, and are distributed at intervals in the circumferential direction of the rotor core 202, and the polarities of the adjacent permanent magnets 204 are different. During operation of the motor, the rotor assembly 200 is capable of engaging the stator assembly and outputting torque.

In this embodiment, it may be that at least a portion of the stator assembly is located inside the rotor assembly 200. At this time, the stator assembly serves as an inner stator, and the rotor assembly 200 serves as an outer rotor.

Further, as shown in fig. 8 and 9, with at least a portion of the stator assembly located inside the rotor assembly 200, the permanent magnets 204 remain on the inner surface of the rotor core 202. The permanent magnet pole may be composed of a plurality of permanent magnets 204 having two lateral edges and having inner and outer surfaces of substantially circular arc shape, or may be an integrally formed magnet ring. Alternatively, the permanent magnet 204 material may be ferrite, plastic magnet, rare earth permanent magnet, or rubber magnetic strip.

In this embodiment, it may be that at least a portion of the rotor assembly 200 is located inside the stator assembly. In this case, the rotor assembly 200 serves as a rotor stator, and the stator assembly serves as an outer stator.

Further, with at least a portion of the rotor assembly 200 located inside the stator assembly, the permanent magnets 204 forming the permanent magnet poles are placed on the outer surface or inside of the rotor core 202, or inside the core, such as a V-shape, a spoke-shape, or the like.

A twelfth embodiment of the present invention provides a motor, further comprising, in addition to the eleventh embodiment:

the pole pair number Ps of the winding satisfies: ps ═ ax ± Pr |, a denotes the number of stator main teeth 106, x denotes the number of stator sub-teeth on each stator main tooth 106, and Pr denotes the number of pole pairs of the plurality of permanent magnets 204, wherein the stator sub-teeth include the first sub-teeth 112 and the second sub-teeth 114. Under the limitation, new harmonic components in the air gap flux density can be used as working harmonics of the motor to provide output torque for the motor, so that the torque density of the motor is effectively improved.

A thirteenth embodiment of the present invention provides a stator assembly that generates a new operating harmonic and uses it to generate torque by the magnetic field modulation principle, and reduces torque ripple and improves vibration noise performance by the offset design of the tooth shoes 110 or the slots 118.

In this embodiment, as shown in fig. 1 and 2, the stator assembly includes a stator core 102 and windings wound on the stator core 102; the stator core 102 includes a yoke portion 104 and a plurality of stator main teeth 106 extending radially from the yoke portion 104, and a stator slot 120 is formed between two adjacent stator main teeth 106; the winding includes a plurality of coils disposed in the stator slots 120, and each coil is wound around only one stator main tooth 106. One end of each stator main tooth 106 is formed with a tooth shoe 110, and a notch 118 is formed between adjacent tooth shoes 110. The tooth shoe 110 is circumferentially provided with a first pair of teeth 112 and a second pair of teeth 114 on both sides, and a groove 116 is formed between the first pair of teeth 112 and the second pair of teeth 114. Also, the tooth shoe 110 is asymmetrical about a body bisector of the body 108.

Further, as shown in fig. 1 and 2, the tooth shoe 110 is asymmetrical about a bisector of the tooth body 108, including but not limited to the following:

in case 1, as shown in fig. 2, the distances from both side walls of the groove 116 to the tooth body bisector of the tooth body 108 in the circumferential direction of the stator assembly are not equal (i.e., L1 ≠ L2). And, at the notch 118, an angle bisector of an included angle formed between the body bisectors of two adjacent tooth bodies 108 is equidistant from the first secondary tooth 112 and the second secondary tooth 114 (i.e., d1 is d 2).

In case 2, the distances from the two side walls of the groove 116 to the tooth body bisector of the tooth body 108 in the circumferential direction of the stator assembly are not equal (i.e., L1 ≠ L2). Also, at the notch 118, the angle bisector of the included angle formed between the body bisectors of two adjacent body 108 is not equidistant from the first secondary tooth 112 and the second secondary tooth 114 (i.e., d1 ≠ d 1).

In case 3, as shown in fig. 1, the distances from the two side walls of the groove 116 to the tooth body bisector of the tooth body 108 are equal in the circumferential direction of the stator assembly (i.e., L1 is L2). Also, at the notch 118, the angle bisector of the included angle formed between the body bisectors of two adjacent body 108 is not equidistant from the first secondary tooth 112 and the second secondary tooth 114 (i.e., d1 ≠ d 1).

With the above arrangement, the first and

second sub-teeth

112 and 114 function as a magnetic conductive member, and also function as a modulation member, thereby achieving a magnetic field modulation effect. At this time, in the stator assembly of the present invention, the stator main tooth 106 is split into at least a first secondary tooth 112 and a second secondary tooth, and a larger groove 116 is formed between the first secondary tooth 112 and the second secondary tooth, so that more harmonic components are introduced into the air gap permeance. When the permanent magnetic motive force and the air gap magnetic conductance containing harmonic waves act, new harmonic wave components appear in the air gap flux density. And then, a winding is designed according to the harmonic component, so that a new harmonic component appearing in the air gap flux density can be used as the working harmonic of the motor to provide output torque for the motor, and the torque density of the motor is effectively improved.

Furthermore, in the stator assembly provided by the utility model, each coil of the winding is only wound on one stator main tooth 106, namely, a single-tooth winding concentrated winding structure is adopted, and the end part of the motor winding is smaller, so that the copper consumption is reduced, the modularization is convenient to realize, and the production and manufacturing efficiency is improved.

Further, in the stator assembly proposed by the present invention, the tooth shoe 110 is disposed asymmetrically with respect to the tooth body bisector of the tooth body 108, and specifically, the tooth shoe 110 or the notch 118 is offset to one side of the tooth body bisector. Through the design, the air gap magnetic conductance distribution can be changed, and partial harmonic waves are weakened, so that the torque pulsation is reduced, and the vibration noise performance of the motor is improved.

Therefore, in the stator assembly provided by the present invention, at least the first secondary tooth 112 and the second secondary tooth 114 are disposed on the tooth shoe 110 of the stator main tooth 106, and further, the first secondary tooth 112 and the second secondary tooth 114 are used as modulation components to realize the effect of magnetic field modulation, so that more harmonic components are introduced into the air gap flux guide, and the performance of the motor using the stator assembly is significantly improved. In addition, the tooth shoe 110 is asymmetrically arranged about the tooth body bisector of the tooth body 108, so that the tooth shoe 110 or the groove 116 deviates towards one side of the tooth body bisector of the tooth body 108, the air gap magnetic conductance distribution is further changed, partial harmonic waves are weakened, torque pulsation is reduced, and the vibration noise performance of the motor applying the stator assembly is improved.

Moreover, the size of the slot 118, which is different from the size of the groove 116, changes the uniformity of the stator secondary teeth (which include at least the first secondary tooth 112 and the second secondary tooth 114) in circumferential distribution, i.e. reduces the period number of the air gap flux guide, and the working harmonics of the air gap flux density are the pole pair number: l Pr ± i × Zf | (i ═ 0, 1, 2 … …), Zf being the number of permeance cycles of the air gap; when the number of the permeance cycles of the air gap is reduced, the flux density harmonic component generated by modulation is increased, namely more working harmonics are generated, so that the output torque of the motor is further improved.

As shown in fig. 8 and 9, a fourteenth embodiment of the present invention proposes an electric machine including a stator assembly according to a thirteenth embodiment of the present invention. In addition, the machine includes a rotor assembly 200, which is concentrically disposed with the stator assembly.

In this embodiment, further, as shown in fig. 9, the rotor assembly 200 includes a rotor core 202 and a plurality of permanent magnets 204; the plurality of permanent magnets 204 are provided on the rotor core 202, and are distributed at intervals in the circumferential direction of the rotor core 202, and the polarities of the adjacent permanent magnets 204 are different. During operation of the motor, the rotor assembly 200 is capable of engaging the stator assembly and outputting torque.

In addition, the number of pole pairs Ps of the winding satisfies: ps ═ ax ± Pr |, a denotes the number of stator main teeth 106, x denotes the number of stator sub-teeth on each stator main tooth 106, and Pr denotes the number of pole pairs of the plurality of permanent magnets 204, wherein the stator sub-teeth include the first sub-teeth 112 and the second sub-teeth 114. Under the design, after the magnetic field of the Ps antipole of the stator is acted by the modulation block, namely the stator secondary tooth, the magnetic field of the Pr antipole is generated, and the pole number of the Pr antipole is the same as that of the pole number of the rotor magnetic field, so that the magnetic field modulation can be realized, the torque is generated by utilizing harmonic waves, and the motor performance is improved.

In this embodiment, it may be that at least a portion of the stator assembly is located inside the rotor assembly 200. It is also possible that at least a portion of the rotor assembly 200 is located inside the stator assembly.

With at least a portion of the stator assembly located inside rotor assembly 200, permanent magnets 204 remain on the inner surface of rotor core 202. The permanent magnet pole may be composed of a plurality of permanent magnets 204 having two lateral edges and having inner and outer surfaces of substantially circular arc shape, or may be an integrally formed magnet ring. Alternatively, the permanent magnet 204 material may be ferrite, plastic magnet, rare earth permanent magnet, or rubber magnetic strip.

With at least a portion of the rotor assembly 200 located inside the stator assembly, the permanent magnets 204 forming permanent magnet poles are placed on the outer surface or inside of the rotor core 202, or inside the core, such as a V-shape, spoke-shape, or the like.

A fifteenth embodiment of the present invention proposes an electric appliance (not shown in the drawings) including the motor according to the above-described embodiment.

The electrical equipment provided by the embodiment comprises the motor in the embodiment. Thus, the overall benefits of the motor described above are achieved and will not be discussed in detail here.

Specifically, the electrical equipment provided by the embodiment can be products such as a refrigerator, a washing machine, an air conditioner and the like.

In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," 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 utility model. 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 above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A stator assembly, comprising:

a stator core including a yoke portion and a stator main tooth, the stator main tooth including:

a tooth body, a tooth root of the tooth body being connected to the yoke;

the tooth shoe is arranged at the tooth top of the tooth body, a first auxiliary tooth and a second auxiliary tooth are arranged on the tooth shoe, and a groove is formed between the first auxiliary tooth and the second auxiliary tooth;

the winding is arranged on the stator main tooth;

wherein the tooth shoe is asymmetrically arranged about a body bisector of the body.

2. The stator assembly of claim 1,

and in the circumferential direction of the stator assembly, the distances from the two side walls of the groove to the tooth body bisector of the tooth body are different.

3. The stator assembly of claim 1,

and in the circumferential direction of the stator assembly, the distances from the two ends of the tooth shoe to the tooth body bisector of the tooth body are different.

4. The stator assembly of claim 1,

the quantity of stator owner tooth is at least two, and is adjacent first vice tooth with the notch has between the vice tooth of second notch department, adjacent two the angular bisector of the contained angle that forms between the tooth body bisector of tooth body arrives first vice tooth with the distance of the vice tooth of second varies.

5. The stator assembly of claim 4,

the size of the notch is different from the size of the groove in the circumferential direction of the stator assembly.

6. The stator assembly of claim 5,

the size of the notch is smaller than the size of the groove in the circumferential direction of the stator assembly.

7. The stator assembly of any of claims 1-6,

the yoke is cyclic annular, the tooth root of stator owner tooth connect in the periphery wall of yoke.

8. The stator assembly of any of claims 1-6,

the tooth body bisector of the first auxiliary tooth and the tooth body bisector of the second auxiliary tooth form an included angle beta which satisfies the following conditions: 1 ≦ β/(2 π/(ax)) < 1.4, wherein a represents the number of said stator primary teeth, x represents the number of stator secondary teeth on each of said stator primary teeth, said stator secondary teeth comprising said first secondary teeth and said second secondary teeth.

9. The stator assembly of any of claims 1-6,

the stator core includes at least two stacks, each stack including a yoke section and a stator main tooth, the stator main tooth being disposed on the yoke section, the yoke sections of adjacent two stacks being connected, the yoke including a plurality of the yoke sections.

10. The stator assembly of claim 9,

the yoke sections of adjacent two of the stacks are detachably connected;

the stator assembly further comprises a fixing piece, and two adjacent stacked bodies are fixed through the fixing piece; and/or

Two adjacent stacked bodies are welded and connected; and/or

And two adjacent stacked bodies are integrally injected.

11. The stator assembly of any of claims 1-6,

the tooth root of the tooth body is detachably connected with the yoke part; and/or

The tooth top and the tooth boots of tooth body are detachable to be connected.

12. An electric machine, comprising:

the stator assembly of any of claims 1-11;

the rotor assembly comprises a rotor core and a plurality of permanent magnets, the permanent magnets are arranged on the rotor core and distributed at intervals in the circumferential direction of the rotor core, and the magnetic poles of the permanent magnets are different.

13. The electric machine of claim 12,

at least a portion of the stator assembly is located inside the rotor assembly; or

At least a portion of the rotor assembly is located inside the stator assembly.

14. The electrical machine according to claim 12 or 13,

the pole pair number Ps of the winding satisfies the following conditions: ps ═ ax ± Pr |, a denotes the number of the stator main teeth, x denotes each of the number of the stator sub-teeth on the stator main teeth, Pr denotes the number of pole pairs of the plurality of permanent magnets, wherein the stator sub-teeth include the first sub-teeth and the second sub-teeth.

15. An electrical device, comprising:

an electric machine as claimed in any one of claims 12 to 14.