CN119231785A - Stator of axial flux motor, axial flux motor and wind wheel assembly - Google Patents

Abstract

The present application discloses a stator of an axial flux motor, an axial flux motor and a wind wheel assembly. The stator of the axial flux motor includes a yoke and stator teeth. The yoke is arranged in a ring shape. The stator teeth protrude from the surface of the yoke along the axial direction of the yoke, and the stator teeth include a plurality of stator teeth, which are arranged at intervals along the circumferential direction of the yoke and surround to form winding grooves. In the same stator tooth, the stator tooth includes a first tooth segment located on the inner side of the yoke and a second tooth segment located on the outer side of the yoke; along the direction from the inner side of the yoke to the outer side of the yoke, the width of the first tooth segment along the width direction of the stator tooth widens; the width of the second tooth segment along the width direction of the stator tooth remains unchanged. The present application solves the problem of large vibration and noise in the axial flux motor.

Description

Stator of axial flux motor, axial flux motor and wind wheel assembly

Technical Field

The application relates to the technical field of driving devices, in particular to a stator of an axial flux motor, the axial flux motor and a wind wheel assembly.

Background

In the prior art, a permanent magnet motor of an air conditioner fan and the like mostly adopt a built-in rotor structure to reduce the axial size of the permanent magnet motor, so that the occupied area of the permanent magnet motor is reduced. However, the cogging torque and torque pulsation in the permanent magnet motor adopting the built-in rotor structure are relatively large, so that the permanent magnet motor has the problems of vibration and high noise.

Disclosure of Invention

The application mainly aims to provide a stator of an axial flux motor, the axial flux motor and a wind wheel assembly, so as to solve the problem that a permanent magnet motor in the background art has large vibration noise.

According to one aspect of the present application there is provided a stator for an axial flux electric machine comprising:

A yoke portion which is annularly arranged;

the stator teeth are protruded out of the surface of the yoke part along the axial direction of the yoke part, the stator teeth comprise a plurality of stator teeth, the plurality of stator teeth are arranged at intervals along the circumferential direction of the yoke part and are surrounded to form a winding groove, and in the same stator teeth, the stator teeth comprise a first tooth section positioned at the inner side of the yoke part and a second tooth section positioned at the outer side of the yoke part;

The width of the first tooth segment along the width direction of the stator teeth is widened along the direction from the inner side of the yoke to the outer side of the yoke, and the width of the second tooth segment along the width direction of the stator teeth is unchanged.

Further, in the same stator tooth, the ratio of the length of the second tooth segment to the length of the stator tooth is 1/4 to 4/7 along the radial direction of the yoke.

Further, the end portion of the stator tooth away from the yoke is provided with a flange extending in the width direction of the stator tooth, and a plurality of the flanges in the same stator tooth form a pole shoe whose width in the width direction of the stator tooth widens from the inside of the yoke toward the outside of the yoke.

Further, the spacing between two adjacent pole shoes is kept unchanged from the inner side of the yoke to the outer side of the yoke.

Further, the flange includes a first flange portion and a second flange portion, the first flange portion and the second flange portion being disposed on opposite sides of the stator teeth in a width direction, respectively, a width of the first flange portion in the width direction of the stator teeth being greater than a width of the second flange portion in the width direction of the stator teeth.

Further, on two adjacent stator teeth, the first flange portion on a first one of the stator teeth is disposed adjacent to the second flange portion on the other one of the stator teeth.

Further, an insert block is arranged on one of the end part, close to the yoke part, of the stator tooth and the yoke part, and an insert slot matched with the insert block is arranged on the other one of the end part, close to the yoke part, of the stator tooth.

Further, the stator teeth are of an integrally formed structure, and/or each stator tooth comprises a plurality of tooth punching sheets which are overlapped along the radial direction of the yoke part.

Further, the stator tooth assembly further comprises a plastic package body and a winding, wherein the winding is wound on the stator tooth, and the plastic package body is coated on the outer surface of the stator tooth, the yoke portion and the winding to form a structure.

On the other hand, the application also provides an axial flux motor, which comprises a rotor assembly and the stator of the axial flux motor according to any one of the technical schemes, wherein the rotor assembly comprises a rotor iron core and a rotating shaft, the rotor iron core and the stator of the axial flux motor are oppositely arranged in the axial direction, and the rotating shaft penetrates through the rotor iron core and the stator of the axial flux motor.

On the other hand, the application also provides a wind wheel assembly, which comprises an impeller and the axial flux motor in the technical scheme, and the axial flux motor is in driving connection with the impeller.

In the application, the width of the stator teeth positioned on the inner side of the yoke part is widened to enable the transition of the magnetic flux path to be smoother, the concentration and distortion of the magnetic flux at the edge of the teeth part can be reduced, the change of the magnetic flux is ensured to be more uniform, the cogging torque and the torque pulsation can be reduced, and the vibration and the noise generated by the axial flux motor can be further reduced. The stator tooth widths positioned outside the yoke part are the same, so that the slot widths of the winding slots of the axial flux motor can be increased, and the area of the winding slots is also increased. Correspondingly, when the winding area in the winding groove is unchanged, the ratio between the winding area in the winding groove and the winding groove is reduced, namely the groove filling rate is reduced. Because the excessive slot filling rate can increase the vibration and noise of the motor and can also cause the problem of higher temperature rise, the width of the stator teeth arranged on the outer side of the yoke part is the same, so that the slot filling rate can be reduced, and the temperature rise level of the noise generated by the axial flux motor is further reduced. Meanwhile, the circumference of the enameled wire can be reduced, so that the material cost is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

fig. 1 is a schematic structural view (a) of a stator of an axial flux motor according to the present disclosure;

FIG. 2 is a top view (one) of a stator of an axial-flux electric machine of the present disclosure;

FIG. 3 is a top view of a stator tooth according to the present disclosure;

fig. 4 is a schematic structural view of a stator of an axial flux electric machine according to the present disclosure (ii);

FIG. 5 is a top view (II) of a stator of an axial-flux electric machine according to the present disclosure;

FIG. 6 is a schematic view of a tooth punch according to the present disclosure;

FIG. 7 is a schematic view of a tooth punch according to the present disclosure (II);

FIG. 8 is a schematic view of a yoke according to the present disclosure;

Fig. 9 is a schematic structural diagram of a plastic package according to the present disclosure;

FIG. 10 is a schematic structural view of an axial flux electric machine according to the present disclosure;

FIG. 11 is a cross-sectional view of an axial flux electric machine of the present disclosure;

Fig. 12 is a schematic structural view of a wind turbine assembly according to the present disclosure.

Wherein the above figures include the following reference numerals:

100. Stator, 10, yoke part, 11, slot, 20, stator teeth, 21, tooth part punching sheet, 211, flange, 2111, first flange part, 2112, second flange part, 22, pole shoe, 23, insert block, 30, winding slot, 40, plastic package body, 41, first mounting cavity, 42, second mounting cavity, 43, cover body, 200, axial flux motor, 201, rotor component, 202, rotor core, 203, rotating shaft, 300, wind wheel component, 301 and impeller.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the authorization specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Cogging torque is the circumferential torque produced by the interaction of the permanent magnets and the tooth slots of the stator teeth when the motor is not energized, and this torque varies with the rotor position and is therefore a pulsating torque. The cogging torque produces a resultant tangential force from the permanent magnets and the stator teeth that always attempts to align the axis of the permanent magnet field with the axis of the stator teeth, thereby tending to position the rotor in a certain position. When the motor rotor rotates, the permanent magnet enables the magnetic conductance to change greatly in a small section of the stator tooth slot, and causes the change of magnetic field energy storage, so that tooth slot torque is generated. Cogging torque can cause torque ripple in the permanent magnet motor, which in turn can lead to speed ripple. Torque ripple also causes vibration and noise in the motor, and when the frequency of the pulsating torque coincides with the armature current resonance frequency, resonance occurs, and vibration and noise of cogging torque are amplified.

In order to solve the problems of large vibration and noise of a permanent magnet motor caused by relatively large cogging torque and torque pulsation in the existing permanent magnet motor with a built-in rotor structure, the invention provides a stator of an axial flux motor, the axial flux motor and a wind wheel assembly.

As shown in fig. 1 to 12, the stator 100 of the axial flux motor includes a yoke 10 and stator teeth 20. The yoke 10 is provided in a ring shape. The stator teeth 20 protrude from the surface of the yoke 10 in the axial direction of the yoke 10. The stator teeth 20 include a plurality of stator teeth 20 that are arranged at intervals in the circumferential direction of the yoke 10 and that surround the winding grooves 30. The end of the stator tooth 20 remote from the yoke 10 is provided with a flange 211 extending in the width direction of the stator tooth 20, a plurality of flanges 211 in the same stator tooth 20 forming a pole shoe 22.

Of the same stator teeth 20, at least the width H1 of the part of the stator teeth 20 located inside the yoke 10 widens from the inside of the yoke 10 toward the outside of the yoke 10. The width H2 of the pole piece 22 in the width direction of the stator teeth 20 in the same stator tooth 20 becomes wider from the inside of the yoke 10 toward the outside of the yoke 10.

In this embodiment, the width H1 of the stator teeth 20 in the same stator tooth 20 is widened from the inner side of the yoke 10 to the outer side of the yoke 10, and the width H2 of the pole shoe 22 in the same stator tooth 20 in the width direction of the stator tooth 20 is widened from the inner side of the yoke 10 to the outer side of the yoke 10, whereby the slot width of the winding slot 30 in the direction from the inner side of the yoke 10 to the outer side of the yoke 10 is smoothly changed, and the abrupt change in magnetic flux due to the large change in the slot width of the winding slot 30 is reduced. This arrangement optimizes the distribution of magnetic flux between stator teeth 20 and pole pieces 22, ensures a more uniform flux path, and advantageously reduces the torque generated by the interaction between the permanent magnets and stator teeth 20 due to the pulsation of the tangential component of the interaction force between the permanent magnets and stator teeth 20 within axial-flux electric machine 200, i.e., reduces the cogging torque of axial-flux electric machine 200. Therefore, the stator 100 of the axial-flux motor can reduce torque ripple of the axial-flux motor 200 caused by the cogging torque of the axial-flux motor 200 and the cogging torque, thereby achieving the purpose of reducing vibration and noise generated by the axial-flux motor 200 due to the torque ripple. Wherein a more uniform flux distribution between stator teeth 20 and pole pieces 22 ensures a more uniform flux path, thereby reducing the likelihood of flux distortion and localized saturation, reducing the magnitude of each subharmonic of stator 100 of axial-flux electric machine, increasing the frequency of the cogging torque fundamental wave, and further reducing vibration and noise generated by axial-flux electric machine 200. Meanwhile, the pole shoe 22 can increase the magnetic conduction area and the power density of the stator 100 of the axial flux motor, optimize the distribution of an electromagnetic field and strengthen the structural strength of the stator 100 of the axial flux motor, so that the stator 100 of the axial flux motor can more effectively bear and conduct the electromagnetic force, reduce the air gap magnetic resistance of the axial flux motor 200, and further be beneficial to reducing the noise generated by the axial flux motor 200.

Further, as shown in fig. 1 to 3, the width of the first tooth segment in the width direction of the stator teeth 20 is widened in the direction from the inside of the yoke 10 toward the outside of the yoke 10, and the width of the second tooth segment in the width direction of the stator teeth 20 is unchanged. The width of the first tooth segment along the width direction of the stator teeth 20 is widened to enable the transition of the magnetic flux path to be smoother, so that concentration and distortion of magnetic flux at the edges of the teeth can be reduced, the change of the magnetic flux is ensured to be more uniform, cogging torque and torque pulsation can be reduced, and vibration and noise generated by the axial flux motor 200 can be reduced. The width of the second tooth segment in the width direction of the stator teeth 20 is not changed, so that the slot width of the winding slot 30 of the axial flux motor 200 is increased, and the area of the winding slot 30 is also increased. Accordingly, when the winding area in the winding slot 30 is unchanged, the ratio between the winding area in the winding slot 30 and the winding slot 30 is reduced, that is, the slot fullness is lowered. Because too high slot filling rate can increase vibration and noise of the motor and also can cause the problem of higher temperature rise, the setting of the width of the second tooth segment along the width direction of the stator teeth 20 in this embodiment can reduce the slot filling rate, thereby reducing the temperature rise level of noise generated by the axial flux motor 200. At the same time, the circumference of the enameled wire can be reduced by the arrangement, so that the material cost is reduced.

Further, in the same stator tooth, the ratio of the length of the second tooth segment to the length of the stator tooth in the radial direction of the yoke is 1/4 to 4/7. For example, the ratio of the length of the second tooth segment to the length of the stator tooth may be set to one of 1/4, 1/3, or 4/7. When the maximum width of the first tooth segment in the radial direction of the yoke 10 increases to a certain value, the stator teeth 20 can ensure that the magnetic circuit density of the axial flux motor is within a reasonable value, which is beneficial to reducing the cogging torque and torque ripple inside the axial flux motor. Specifically, a range of reasonable values of the magnetic circuit magnetic density can be obtained in combination with simulation and the like.

As shown in fig. 4 to 5, further, in the same stator tooth 20, the widths H1 of all the stator teeth 20 gradually and uniformly widen from the inside of the yoke 10 toward the outside of the yoke 10. When the widths H1 of all the stator teeth 20 are uniformly widened from the inside of the yoke 10 toward the outside of the yoke 10, the slot widths of the winding slots 30 are also uniformly changed accordingly. This arrangement can reduce abrupt changes in magnetic flux due to large variations in slot width of the winding slot 30, which is advantageous in reducing the magnitude of cogging torque. In this embodiment, the smaller cogging torque may make axial flux motor 200 more smooth during operation, which is beneficial for reducing vibrations and noise generated by axial flux motor 200. At this time, the width H1 of the stator teeth 20 is uniformly widened from the inner side of the yoke 10 to the outer side of the yoke 10, so that the magnetic flux can be more uniformly distributed while passing through the stator teeth 20, and the more uniformly distributed magnetic flux can reduce concentration and distortion of the magnetic flux at the edges of the teeth, thereby improving the utilization efficiency of the magnetic flux and reducing the local overheating or saturation phenomenon due to the uneven distribution of the magnetic flux. In addition, the uniform widening of the width H1 of all stator teeth 20 also facilitates design and fabrication.

Further, on each stator tooth 20, the gap H3 between adjacent two pole shoes 22 is kept constant from the inside of the yoke 10 toward the outside of the yoke 10. In operation of axial-flux motor 200, magnetic flux enters and exits the air gap through stator teeth 20 and pole pieces 22 to interact with the permanent magnets to create electromagnetic forces. In this embodiment, the distance H3 between two adjacent pole shoes 22 is kept unchanged, so that stable magnetic field distribution can be formed between the pole shoes 22, the distribution of the magnetic flux path and the electromagnetic force is optimized, the magnetic resistance is ensured to be relatively stable on the magnetic flux path, and further the reduction of magnetic flux fluctuation caused by magnetic resistance change is facilitated, and the reduction of vibration and noise of the motor is realized. The distance H3 between two adjacent pole shoes 22 is kept unchanged from the inner side of the yoke 10 to the outer side of the yoke 10, so that the stator teeth 20 with the same specification can be manufactured conveniently, and the production efficiency and consistency can be improved.

As shown in fig. 1 to 5, further, in the same stator tooth 20, the width of the plurality of flanges 211 in the width direction of the stator tooth 20 is widened from the inside of the yoke 10 toward the outside of the yoke 10, and the flanges 211 are symmetrical with respect to the stator tooth 20. The width of the plurality of flanges 211 in the width direction of the stator teeth 20 is widened from the inside of the yoke 10 toward the outside of the yoke 10, so that the working area of the flanges 211 is increased, and the portion of the stator teeth 20 near the outside of the yoke 10 can carry more magnetic flux. The widened flange 211 can guide the magnetic flux to more smoothly pass through the stator teeth 20, and reduce the magnetic leakage phenomenon between the stator teeth 20 and the yoke 10, thereby preventing the problems of the axial flux motor 200 such as energy loss and operation efficiency degradation caused by the magnetic leakage phenomenon. In addition, the widened flange 211 has higher structural strength, can improve the vibration resistance of the stator teeth 20, and reduce the vibration of the stator teeth 20 caused by the cogging torque and torque pulsation of the axial flux motor 200 and the vibration of the stator teeth 20 caused by the radial electromagnetic force action and the stator teeth 20, thereby achieving the purpose of reducing the vibration noise of the motor. The flange 211 is symmetrical about the stator teeth 20 for ease of manufacture and installation.

Further, as shown in fig. 7, the flange 211 includes a first flange portion 2111 and a second flange portion 2112. The first flange portion 2111 and the second flange portion 2112 are provided on opposite sides of the stator teeth 20 in the width direction, respectively, and the width L1 of the first flange portion 2111 in the width direction of the stator teeth 20 is larger than the width L2 of the second flange portion 2112 in the width direction of the stator teeth 20. This arrangement makes it possible to make the air gaps of the winding grooves 30 on both sides of the same stator tooth 20 in the circumferential direction of the yoke 10 unequal, so that the effective torque component of the axial-flux motor 200 is partially canceled, and the average torque of the axial-flux motor 200 is correspondingly reduced. This may result in an air gap flux density distribution that approximates a sine wave such that harmonic components of back emf of axial flux motor 200 are reduced, waveforms of back emf of axial flux motor 200 tend to be more sinusoidal, and harmonic components of back emf are reduced. The reduction of harmonic components of back emf reduces cogging torque of axial-flux motor 200, reduces operational vibrations of axial-flux motor 200, and thereby reduces noise generated by vibrations of axial-flux motor 200. Meanwhile, the width L1 of the first flange portion 2111 along the width direction of the stator teeth 20 is greater than the width L2 of the second flange portion 2112 along the width direction of the stator teeth 20, and the total harmonic distortion value (i.e. THD value, english is referred to as Total Harmonic Distortion for measuring the distortion degree of the harmonic component in the signal to the original signal) is also reduced. The reduction of the total harmonic distortion value is beneficial to reducing the cogging torque and torque ripple of the axial flux motor 200 and reducing the noise generated by the axial flux motor 200.

Wherein, on two adjacent stator teeth 20, a first flange portion 2111 on a first stator tooth 20 is disposed adjacent to a second flange portion 2112 on the other stator tooth 20. By the arrangement, the air gaps of the winding grooves 30 on the two circumferential sides of each stator tooth 20 are unequal, the distribution of the magnetic flux density of the air gaps on the two circumferential sides of each stator tooth 20 is close to a sine wave, harmonic components of counter electromotive force of the axial flux motor 200 are further reduced, the waveform of the counter electromotive force of the axial flux motor 200 tends to be sinusoidal, the running vibration of the axial flux motor 200 is reduced, and noise generated by the vibration of the axial flux motor 200 is reduced.

Further, as shown in fig. 1 to 8, an insert block 23 is provided on an end portion of the stator tooth 20 near the yoke portion 10, and an insert groove 11 adapted to the insert block 23 is provided on the yoke portion 10. Or in another embodiment, the yoke 10 is provided with an insert block 23, and the end of the stator tooth 20 near the yoke 10 is provided with a slot 11 matched with the insert block 23. The insertion block 23 is inserted into the insertion groove 11 to quickly fix the stator teeth 20 to the yoke 10. During operation of axial-flux motor 200, this embodiment may prevent stator teeth 20 from loosening due to vibration. The assembly mode of the insert block 23 and the slot 11 is simple and quick, and the slot 11 can also play a role in pre-positioning to provide installation guide for assembling the insert block 23. The yoke 10 and the stator teeth 20 may be assembled after being produced separately.

Further, each stator tooth 20 includes a plurality of tooth punches 21, and the plurality of tooth punches 21 are stacked in the radial direction of the yoke 10. The stator teeth 20 may be stamped from a sheet of silicon steel. The multiple sizes of stator teeth 20 require multiple gauge modeling. Or after punching a plurality of tooth punching pieces 21, stacking the plurality of tooth punching pieces 21 to form the stator teeth 20. After punching a plurality of tooth punching sheets 21, in the process of stacking the tooth punching sheets 21 to form the stator teeth 20, the plurality of tooth punching sheets 21 can be stacked to form the stator teeth 20 with more specifications. Compared with the manufacturing mode that the stator teeth 20 are formed by punching one piece of silicon steel sheet, the manufacturing mode that a plurality of tooth punching sheets 21 are punched and then stacked to form the stator teeth 20 can reduce the shape and the number of the tooth punching sheets 21, and can reduce the complexity and the cost of a punching die.

Alternatively, the stator teeth 20 may be provided as an integrally formed structure for easier production.

As shown in fig. 9, the stator of the axial flux motor further includes a plastic package body 40 and windings, the windings are wound around the stator teeth 20, and the plastic package body 40 covers the outer surface of the stator teeth 20, the yoke 10 and the windings. When assembling the stator 100 of the axial flux motor, the winding can be wound into an annular coil matched with the stator teeth 20, then the annular coil is sleeved on the stator teeth 20 from one end of the stator teeth 20 close to the yoke 10, and finally the stator teeth 20 assembled with the winding are spliced and fixed on the yoke 10. The assembly mode solves the problems that the efficiency of winding, coiling and punching the stator 100 iron core of the traditional axial flux motor is low, the efficiency of winding wires in the winding grooves 30 is low, and the effective area of the winding grooves 30 is low due to the fact that a winding needle movement space is required to be reserved between windings in the winding grooves 30.

According to another aspect of the present invention, as shown in fig. 1-11, an axial flux electric machine 200 is also disclosed. The axial flux electric machine 200 comprises a rotor assembly 201 and the stator 100 of the axial flux electric machine described above. The rotor assembly 201 includes a rotor core 202 and a rotating shaft 203. The rotor core 202 is disposed axially opposite to the stator 100 of the axial flux motor, and the rotating shaft 203 penetrates the rotor core 202 and the stator 100 of the axial flux motor. The rotor core 202 may be a permanent magnet, and the rotor core 202 may be magnetically coupled to the stator 100 of the axial flux motor, so that the rotor core 202 may rotate. The rotating shaft 203 penetrates through the rotor core 202 and is connected with the rotor core 202, and the rotor core 202 can drive the rotating shaft 203 to rotate. The axial flux electric machine 200 includes all technical effects of the stator 100 of the axial flux electric machine described above. Since the technical effects of the stator 100 of the axial flux motor have been described in detail in the foregoing, a detailed description thereof will be omitted.

Wherein, a first mounting cavity 41 and a second mounting cavity 42 which are separated along the axial direction are arranged in the plastic package body 40. The first mounting cavity 41 is for accommodating the stator teeth 20, the yoke 10 and the windings. The second mounting chamber 42 accommodates the rotor core 202 therein. The plastic package body 40 has a ring structure, and the rotating shaft 203 is fixed in an inner ring of the plastic package body 40 through a bearing. The top end of the plastic package body is provided with a cover body 43 for covering the second mounting cavity 42.

According to another aspect of the present invention, as shown in fig. 1-12, a wind turbine assembly 300 is also disclosed. The wind wheel assembly 300 includes an impeller 301 and the axial flux motor 200 described above. Axial flux motor 200 is drivingly connected to impeller 301, and axial flux motor 200 may rotate impeller 301. The wind wheel assembly 300 includes all the technical effects of the axial flux motor 200 described above, and will not be described herein.

As shown in fig. 1 to 9, in the present invention, the winding can be formed rapidly by wire winding, and the processing efficiency is extremely high. The stator teeth 20 and the yoke part 10 can be manufactured by high-speed punching, the stator teeth 20 and the yoke part 10 are simple to manufacture, the processing efficiency is high, manufacturing materials are saved, and the problems that the processing efficiency is low when the traditional axial flux motor stator core is wound into the winding groove 30, and the effective area of the winding groove 30 is low because a winding needle movement space is required to be reserved between windings in the winding groove 30 are solved. In addition, the winding, the stator teeth 20 and the yoke 10 are integrally molded by the plastic package body 40, so that the stator teeth 20, the winding and the yoke 10 are good in mounting and fixing strength and high in positioning precision, and the plastic package body 40 is convenient to mold into shapes of various needed structures. And the plastic package body 40 is made of thermosetting plastic package materials with special formula, so that the plastic package body 40 is ensured to have high insulativity, high thermal conductivity and good damping characteristics, the insulation reliability of the plastic package body 40 is improved, and the temperature rise and noise of the stator 100 of the axial flux motor, the axial flux motor 200 and the wind wheel assembly 300 are reduced.

Spatially relative terms, such as "above," "upper" and "upper surface," "above" and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the process is carried out, the exemplary term "above" may be included. Upper and lower. Two orientations below. The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.

The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (11)

1. A stator of an axial flux motor, characterized by comprising: A yoke (10), wherein the yoke (10) is arranged in a ring shape; stator teeth (20), the stator teeth (20) protruding from the surface of the yoke (10) along the axial direction of the yoke (10), the stator teeth (20) comprising a plurality of stator teeth (20), the plurality of stator teeth (20) being arranged at intervals along the circumferential direction of the yoke (10) and surrounding to form winding slots (30), and in the same stator tooth (20), the stator teeth (20) comprising a first tooth segment located on the inner side of the yoke (10) and a second tooth segment located on the outer side of the yoke (10); Wherein, along the direction from the inner side of the yoke (10) to the outer side of the yoke (10), the width of the first tooth segment along the width direction of the stator tooth (20) becomes wider; and the width of the second tooth segment along the width direction of the stator tooth (20) remains unchanged. 2. The stator of the axial flux motor according to claim 1 is characterized in that, in the same stator tooth (20), along the radial direction of the yoke (10), the ratio of the length of the second tooth segment to the length of the stator tooth (20) is 1/4 to 4/7. 3. The stator of the axial flux motor according to claim 2 is characterized in that a flange (211) extending along the width direction of the stator tooth (20) is provided at the end of the stator tooth (20) away from the yoke (10), and a plurality of the flanges (211) in the same stator tooth (20) form a pole shoe (22), and the width of the pole shoe (22) along the width direction of the stator tooth (20) widens from the inner side of the yoke (10) to the outer side of the yoke (10). 4. The stator of the axial flux motor according to claim 3 is characterized in that the distance between two adjacent pole shoes (22) remains unchanged from the inner side of the yoke (10) to the outer side of the yoke (10). 5. The stator of the axial flux motor according to claim 4 is characterized in that the flange (211) includes a first flange portion (2111) and a second flange portion (2112), the first flange portion (2111) and the second flange portion (2112) are respectively arranged on opposite sides of the stator tooth (20) along the width direction, and the width of the first flange portion (2111) along the width direction of the stator tooth (20) is greater than the width of the second flange portion (2112) along the width direction of the stator tooth (20). 6. The stator of the axial flux motor according to claim 5 is characterized in that, on two adjacent stator teeth (20), the first flange portion (2111) on the first stator tooth (20) and the second flange portion (2112) on the other stator tooth (20) are arranged adjacent to each other. 7. The stator of an axial flux motor according to any one of claims 1 to 6 is characterized in that an insert block (23) is provided on one of the end of the stator tooth (20) close to the yoke (10) and the yoke (10), and a slot (11) adapted to the insert block (23) is provided on the other of the two. 8. The stator of an axial flux motor according to any one of claims 1 to 6 is characterized in that the stator teeth (20) are an integrally formed structure; and/or each of the stator teeth (20) includes a plurality of tooth punchings (21), and the plurality of tooth punchings (21) are stacked radially along the yoke (10). 9. The stator of the axial flux motor according to any one of claims 1 to 6 is characterized in that it also includes a plastic package (40) and a winding, wherein the winding is wound around the stator teeth (20), and the plastic package (40) is coated on the outer surface of the structure formed by the stator teeth (20), the yoke (10) and the winding. 10. An axial flux motor, characterized in that the axial flux motor (200) comprises a rotor assembly (201) and the stator (100) of the axial flux motor according to any one of claims 1 to 9, the rotor assembly (201) comprises a rotor core (202) and a rotating shaft (203), the rotor core (202) and the stator (100) of the axial flux motor are axially arranged opposite to each other, and the rotating shaft (203) passes through the rotor core (202) and the stator (100) of the axial flux motor. 11. A wind wheel assembly, characterized in that the wind wheel assembly (300) comprises an impeller (301) and the axial flux motor (200) according to claim 10, and the axial flux motor (200) is drivingly connected to the impeller (301).