CN116885910B

CN116885910B - Motor stator structure and axial flux motor

Info

Publication number: CN116885910B
Application number: CN202311156215.8A
Authority: CN
Inventors: 纪大山; 孙法乾
Original assignee: Jiawode Foshan Technology Co ltd
Current assignee: Jiawode Foshan Technology Co ltd
Priority date: 2023-09-08
Filing date: 2023-09-08
Publication date: 2023-11-10
Anticipated expiration: 2043-09-08
Also published as: CN116885910A

Abstract

The application discloses a motor stator structure and an axial flux motor, and belongs to the technical field of motors; the stator shaft hole of the stator plate extends along a first direction, the plurality of coil sheets encircle the circular array of the stator shaft hole and are arranged in the mounting through holes on the stator plate extending along the first direction, each coil sheet is formed by sequentially connecting a plurality of energizing coils, all the energizing coils are sequentially stacked along a second direction and are sequentially arranged along a direction perpendicular to the second direction, and the second direction forms an acute angle with the first direction. In addition, the motor stator structure is fixed in the casing, and the rotor structure has the rotor shaft hole, and rotor structure constitutes the stator subassembly that changes jointly with the motor stator structure, and a plurality of stator subassemblies that change are located along first direction interval in the holding chamber of casing, and the pivot extends along first direction and passes stator shaft hole and rotor shaft hole, and the pivot runs through the casing and is fixed in the rotor structure. The application solves the problem of iron core loss and has the advantages of small volume, light weight, good heat dissipation effect and high efficiency.

Description

Motor stator structure and axial flux motor

Technical Field

The application belongs to the technical field of motors, and particularly relates to a motor stator structure and an axial flux motor.

Background

Under the layout of a double-carbon strategy, the driving motor is used as a core component of a new energy automobile, and development of high efficiency, miniaturization and intellectualization is required to be paid more attention to. In the development of new energy automobiles and high-power motors, core indexes such as power density, efficiency and the like of a driving motor and cost reduction become the urgent problems to be solved in the further development of the motors.

In the prior art, a stator structure of a motor uses a soft magnetic material, namely silicon steel, and coils are wound on the silicon steel, so that a magnetic field can be generated after the coils are electrified, however, the coils can generate eddy current, and the defects of iron core hysteresis, iron core loss, cogging torque and the like exist. Accordingly, coreless axial flux machines (or pan-type machines) have evolved. The axial flux motor adopts the structural design of a stator without an iron core, has the advantages of high power density, high voltage adjustment rate, high efficiency and the like, however, the existing axial flux motor has the defects of large volume and weight, poor heat dissipation effect, low efficiency and the like.

Disclosure of Invention

In order to solve the above-mentioned technical problems, the present application aims to provide a motor stator structure and an axial flux motor, which not only avoid the problem of core loss, but also have the advantages of small volume, light weight, good heat dissipation effect and high efficiency.

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

in a first aspect, the present application discloses a motor stator structure comprising:

a stator plate having a stator shaft hole whose central axis extends in a first direction;

the stator disc is provided with a plurality of mounting through holes extending along a first direction, each coil sheet is correspondingly arranged in the mounting through holes, each coil sheet is formed by sequentially connecting a plurality of energizing coils, all the energizing coils are sequentially stacked along a second direction and sequentially arranged along a direction perpendicular to the second direction, and the second direction and the first direction form an acute angle.

The motor stator structure provided by the application has at least the following beneficial effects: the coil sheet is formed by sequentially connecting a plurality of energized coils, all the energized coils are sequentially stacked along the second direction and are sequentially arranged along the direction perpendicular to the second direction, so that the coil sheet is made to be in a long and long flat shape, and the surface area of the coil sheet is increased; the plurality of coil sheets are respectively arranged in the plurality of mounting through holes of the stator plate, the axial direction of the mounting through holes extends along the first direction, and because the electrified coils are stacked along the second direction, and an acute angle is formed between the second direction and the first direction, the size of the coil sheets in the first direction can be reduced, the space can be saved, the size of the stator plate in the first direction can be reduced, the volume of the axial flux motor is smaller, the weight is lighter, and meanwhile, the magnetic flux path is more efficient, and the efficiency of the axial flux motor can be improved; the mounting through holes penetrate through the opposite surfaces of the stator plate in the first direction, so that air flowing through the mounting through holes can take away heat of the coil sheet, and the surface area of the coil sheet is increased to some extent, so that the heat dissipation effect can be improved.

As a further improvement of the above technical solution, each coil sheet comprises a copper wire and a self-adhesive insulating varnish layer, and the self-adhesive insulating varnish layer is coated on the outer surface of the copper wire. So set up, it is firm to impel arbitrary adjacent two circular telegram coils bonding through self-adhesion insulating paint layer to form the coil flake that wholly is stable, be difficult for dispersing, conveniently set up the coil flake at the installation through-hole of stator dish.

As a further improvement of the above technical solution, each of the energizing coils has an elliptical shape.

As a further improvement of the above technical solution, the number of the coil sheets is a multiple of 3, and three adjacent coil sheets are respectively connected with three-phase wires. By the arrangement, three-phase direct-current frequency conversion noninductive control can be realized.

As a further improvement of the technical scheme, each mounting through hole is internally provided with a mounting frame, each mounting frame is provided with a mounting cavity, each mounting cavity extends along a first direction and penetrates through two opposite surfaces of each mounting frame, and the coil sheet is arranged in each mounting cavity and is in buckling connection with each mounting frame. So set up, place the coil thin slice in the installation cavity of mounting bracket to impel the coil thin slice to take place the buckle with the mounting bracket to be connected, make the coil thin slice fixed relative to the mounting bracket, then, set up the mounting bracket at the installation through-hole of stator dish, accomplish the work that the coil thin slice was installed in the stator dish.

As a further improvement of the technical scheme, the inner peripheral surface of the mounting cavity is provided with the limiting flanges and the clamping blocks, the limiting flanges and the clamping blocks are distributed at intervals along the first direction, the mounting space for accommodating the coil sheet is limited together, the clamping blocks are arranged along the inner peripheral surface of the mounting cavity, and the side surfaces, away from the limiting flanges, of the clamping blocks are provided with guide inclined planes. Because the installation cavity is equipped with a plurality of fixture blocks, every fixture block is provided with the direction inclined plane, consequently, can make the coil flake block smoothly go into the installation space that is limited by spacing flange and fixture block to realize producing the buckle connection effect between mounting bracket and the coil flake.

As a further improvement of the technical scheme, one of the surfaces of the mounting frame in the first direction extends inwards to form the limiting flange, the mounting frame is provided with notches corresponding to each clamping block, the openings of the notches face the limiting flange, and the notches penetrate through the inner side and the outer side of the mounting cavity respectively. So set up, spacing flange and fixture block only can shelter from a side of coil thin slice in the first direction, increase the radiating area of the coil thin slice that is located on the mounting bracket to improve the radiating effect of coil thin slice.

As a further improvement of the technical scheme, each mounting through hole is provided with two mounting frames which are distributed along the first direction, and the limiting flanges are flush with the surface of the stator plate in the first direction. The arrangement can reduce the air gap between the coil sheet and the rotor structure when the motor stator structure and the rotor structure are matched to work, thereby reducing the magnetic resistance of the magnetic circuit and improving the efficiency of the axial flux motor.

In a second aspect, the present application discloses an axial flux electric machine comprising:

a housing having a receiving cavity;

the motor stator structure according to any one of the above-mentioned aspects, which is fixedly connected with the housing;

the rotor structure is provided with a rotor shaft hole, the rotor structure and the motor stator structure jointly form a rotor-stator assembly, and a plurality of rotor-stator assemblies are arranged at intervals along a first direction and are arranged in the accommodating cavity;

the rotating shaft extends along a first direction, penetrates through the stator shaft hole and the rotor shaft hole respectively and penetrates through the shell, and is fixedly connected with the rotor structure.

The axial flux motor provided by the application has at least the following beneficial effects: the motor stator structure adopting the structure of the axial flux motor can solve the problems of large volume and weight, poor heat dissipation effect and low efficiency of the existing axial flux motor.

As a further improvement of the technical scheme, the rotor structure comprises a rotor disc and a plurality of magnetic rings, wherein the rotor disc is provided with through holes for installing the magnetic rings, the plurality of magnetic rings are arranged in a circular array around the rotor shaft hole, and the number of the magnetic rings is consistent with that of the coil sheets.

Drawings

The application is further described below with reference to the drawings and examples;

fig. 1 is a perspective view of a structure in which a rotating shaft is connected to a plurality of rotor-stator assemblies in an axial flux motor according to an embodiment of the present application;

fig. 2 is a schematic structural view of a rotor-stator assembly in an axial flux electric machine according to an embodiment of the present application;

fig. 3 is a schematic structural view of a connection between a coil sheet and a mounting frame in a stator structure of a motor according to an embodiment of the present application;

fig. 4 is a structural exploded view of an axial flux electric machine provided by an embodiment of the present application;

fig. 5 is an axial cross-sectional schematic view of an axial flux electric machine provided by an embodiment of the present application.

The figures are marked as follows: 100. sealing cover; 210. an end cap; 220. a housing; 221. a groove; 300. a seal ring; 400. a bearing; 500. a motor stator structure; 510. a stator plate; 520. a coil sheet; 530. a cable; 540. a convex portion; 550. a mounting frame; 551. a limit flange; 552. a clamping block; 553. a mounting cavity; 554. a positioning part; 555. a notch; 600. a rotor structure; 610. a rotor disc; 620. a magnetic ring; 700. a rotating shaft.

Detailed Description

Reference will now be made in detail to the present embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present application, but not to limit the scope of the present application.

In the description of the present application, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.

In the description of the present application, if there is a word description such as "a plurality" or the like, the meaning of the plurality is one or more, the meaning of the plurality is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and above, below, within, etc. are understood to include the present number. The description of first, second, and third is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present application, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present application can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1-5, several embodiments are presented below for a motor stator structure and axial flux motor of the present application.

As shown in fig. 1 to 3, the first embodiment of the present application provides a motor stator structure 500, which can well solve the problems of core loss, torque ripple, cogging torque, stator hysteresis, etc. existing in the conventional stator structure, the motor stator structure 500 includes a stator plate 510 and a plurality of coil sheets 520, and the motor stator structure 500 has the advantages of small volume, light weight, good heat dissipation effect and high efficiency.

The stator plate 510 has a stator shaft hole whose central axis extends in the first direction. In this embodiment, the stator plate 510 is a disc, and is made of an ultra-light rigid material, such as magnesium-lithium alloy, titanium alloy, carbon fiber, etc., which is not limited herein. The stator shaft hole is located at the middle position of the stator plate 510, and is a circular hole.

All of the coil laminations 520 are arranged in a circular array around the stator shaft bore of the stator plate 510. The stator plate 510 is provided with mounting through holes, the axial direction of which is arranged to extend in the first direction, the number of the mounting through holes being plural, the mounting through holes and the coil sheet 520 being identical in number. The mounting through holes provide mounting locations for the coil sheet 520. Each coil sheet 520 is correspondingly mounted in a mounting through hole on the stator plate 510, so that all the coil sheets 520 are relatively fixed with the stator plate 510.

Each coil sheet 520 is formed by sequentially connecting a plurality of energizing coils, and all the energizing coils are sequentially stacked along a second direction, and simultaneously, all the energizing coils are sequentially arranged along a direction perpendicular to the second direction, wherein the second direction forms an acute angle with the first direction.

It will be appreciated that the number of energized coils in the coil sheet 520 configuration may be selected according to the actual situation and is not particularly limited herein. In the manufacturing process of each coil sheet 520, each of the energizing coils is continuously wound by using one energizing wire, the axial direction of the energizing coil is extended along the second direction, and any two adjacent energizing coils are arranged in the second direction and staggered in the direction perpendicular to the second direction. Each coil sheet 520 has two terminals.

It can be appreciated that in the motor stator structure 500 provided in this embodiment, since the coil sheet 520 is formed by sequentially connecting a plurality of energized coils, and all the energized coils are not only sequentially stacked along the second direction, but also sequentially arranged along the direction perpendicular to the second direction, the overall structure of the coil sheet 520 is in a long and flat shape, and the surface area of the coil sheet 520 can be increased.

Since the plurality of coil sheets 520 are respectively mounted in the plurality of mounting through holes on the stator plate 510, the axial direction of the mounting through holes extends along the first direction, all the energized coils are sequentially stacked along the second direction, and an acute angle is formed between the second direction and the first direction, so that after the coil sheets 520 are mounted on the stator plate 510, the axial direction (i.e., the second direction) of the coil sheets 520 forms an acute angle with the first direction of the stator plate 510, and then the size of the coil sheets 520 in the first direction can be reduced, the mounting space of the coil sheets 520 in the first direction can be saved, the size of the stator plate 510 in the first direction can be reduced, the volume of the axial flux motor can be smaller, the weight can be lighter, and the unit volume power density and the unit weight power density of the axial flux motor can be improved.

Meanwhile, the stator plate 510 is provided with the coil sheet 520 with the structure, so that a magnetic flux path is more efficient, magnetic field energy is improved, energy consumption is reduced, magnetic space is expanded, and therefore the axial flux motor can achieve the purposes of high temperature resistance, high power density, high torque density and large rotating speed interval, and the efficiency of the axial flux motor can be improved.

Since the mounting through holes extend along the first direction and penetrate through the opposite surfaces of the stator plate 510, air flowing through the mounting through holes can take away heat of the coil sheet 520, and the surface area of the coil sheet 520 is increased, thereby improving the heat dissipation effect of the motor stator structure 500.

The motor stator structure 500 of this embodiment cancels all soft magnetic materials such as silicon steel in the stator core of the conventional motor, adopts the combination of the coil sheet 520 and the stator disk 510 to form a stator assembly, changes the stator electromagnetic action mode of the conventional axial flux motor, makes the size smaller, and the weight lighter, and is very suitable for new energy automobiles.

In some embodiments, the structure of each coil sheet 520 includes a self-adhesive insulating varnish layer and copper wire. Wherein, the copper wire can be selected from super copper wire with high conductivity and low loss, and the self-adhesive insulating paint layer can be selected from self-adhesive insulating paint material with corona resistance and high thermal conductivity. The self-adhesive insulating paint layer is coated on the outer surface of the copper wire, so that the enameled wire is formed.

The bonding of any two adjacent energized coils is promoted to be firm through the self-adhesive insulating paint layer, so that a coil sheet 520 which is stable in whole and not easy to scatter is formed, and the coil sheet 520 is conveniently arranged in the mounting through hole of the stator plate 510.

In some embodiments, each energizing coil is of an elliptical design. Of course, it is not excluded that the energizing coils are of circular design.

In some embodiments, the number of coil sheets 520 is a multiple of 3 on the same circumference of the stator plate 510, and three phase wires are connected to any adjacent three coil sheets 520, respectively, so that three-phase dc conversion non-inductive control can be realized.

As shown in fig. 1 and 2, in the present embodiment, the stator plate 510 is provided with six coil sheets 520, and the six coil sheets 520 are arranged in a circular array with the axis of the stator plate 510 being circular. The extending direction of the coil sheet 520 is perpendicular to a line connecting the center of the coil sheet 520 and the center of the stator plate 510.

In some embodiments, as shown in fig. 1 to 3, a mounting bracket 550 is provided in each mounting through hole of the stator plate 510, and a mounting cavity 553 is formed in the interior of the mounting bracket 550, the mounting cavity 553 extending along a first direction of the mounting bracket 550 and penetrating opposite surfaces of the mounting bracket 550. The shape of the mounting frame 550 is matched with the shape of the mounting through hole, and the mounting frame 550 is embedded in the mounting through hole.

Coil sheet 520 sets up in the installation cavity 553 of mounting bracket 550 to, carry out the buckle between coil sheet 520 and the mounting bracket 550 and connect, make coil sheet 520 relatively mounting bracket 550 motionless, make coil sheet 520 and mounting bracket 550 constitute the stator winding of no iron core jointly, conveniently pack the transportation, need not to use soft magnetic material such as silicon steel to constitute the coil winding. Then, the mounting bracket 550 is disposed in the mounting hole of the stator plate 510, and the coil sheet 520 is mounted to the stator plate 510.

In this embodiment, the mounting bracket 550 is provided with a latch 552 and a limit rib 551. Specifically, the inner peripheral surface of the installation cavity 553 protrudes inward and is formed with a limit rib 551, and in addition, the inner peripheral surface of the installation cavity 553 protrudes inward and is formed with a plurality of clamping blocks 552, and the clamping blocks 552 are arranged at intervals along the inner peripheral surface of the installation cavity 553. The clamping blocks 552 and the limiting flanges 551 are arranged at certain intervals along the first direction of the installation cavity 553, and the clamping blocks 552 and the limiting flanges 551 jointly define an installation space, and the installation space is used for accommodating the coil sheet 520.

In addition, a guiding inclined plane is disposed on the side surface of the clamping block 552 away from the limiting flange 551. In this embodiment, the latch 552 has a rectangular prism shape.

It is understood that the stop flange 551 and the latch 552 are integrally formed with the mounting bracket 550. The dimensions of the limit rib 551 and the latch 552 may be set according to practical situations, and are not limited herein. Since the plurality of clamping blocks 552 are disposed in the mounting cavity 553 of the mounting frame 550, each clamping block 552 is provided with a guiding inclined plane, so that the coil sheet 520 can be smoothly clamped into the mounting space on the mounting frame 550. Because the coil sheet 520 is limited by the clamping block 552 and the limiting flange 551, the coil sheet 520 cannot easily move along the first direction, so that the snap connection between the mounting bracket 550 and the coil sheet 520 is realized.

Further, one of the surfaces of the mounting frame 550 in the first direction extends inward to form a limiting rib 551, that is, the limiting rib 551 is flush with one of the surfaces of the mounting frame 550. Moreover, the mounting frame 550 is provided with a notch 555 corresponding to each of the clamping blocks 552, and the notches 555 and the clamping blocks 552 are identical in number. The opening of breach 555 sets up towards spacing flange 551, and breach 555 runs through the inside and outside both sides of installation cavity 553 respectively. As shown in fig. 3, one surface of the mounting frame 550 is recessed toward the direction of the clamping block 552 and forms a notch 555, and the notch 555 extends along the first direction until the wall surface of the notch 555 is connected with the clamping block 552.

It can be appreciated that the mounting frame 550 is provided with the notch 555, so that the limit flange 551 and the clamping block 552 on the mounting frame 550 can only shield one side surface of the coil sheet 520 in the first direction, and heat at the same position of the coil sheet 520, which is caused by that the opposite side surfaces of the coil sheet 520 in the first direction are respectively contacted with the clamping block 552 and the limit flange 551, cannot be dissipated, so that the heat dissipation area of the coil sheet 520 on the mounting frame 550 can be increased, and the heat dissipation effect of the coil sheet 520 is improved.

In some embodiments, the outer peripheral surface of the mounting frame 550 is provided with a positioning portion 554, and the shape of the positioning portion 554 may be designed according to practical situations, and no specific setting is made here. The mounting holes on the stator plate 510 are correspondingly provided with positioning slots, so that the positioning portions 554 can be correspondingly inserted into the positioning slots when the mounting frame 550 is embedded in the mounting holes of the stator plate 510. Of course, the mounting bracket 550 may be secured to the stator plate 510 by other means, such as screw connection.

In some embodiments, two mounting brackets 550 are disposed in each mounting hole on the stator plate 510, the two mounting brackets 550 being aligned along a first direction of the stator plate 510, and the stop rib 551 on each mounting bracket 550 being flush with a surface of the stator plate 510 in the first direction, as shown in fig. 1 to 3. Then, when the motor stator structure 500 and the rotor structure 600 cooperate, the coil sheet 520 can be disposed closer to the rotor structure 600, so that an air gap between the coil sheet 520 and the rotor structure 600 can be reduced, thereby reducing magnetic circuit reluctance, and improving efficiency of the axial flux motor.

In addition, as shown in fig. 1 to 5, a first embodiment of the present application provides an axial flux electric machine, which includes a housing, a rotor structure 600, a rotating shaft 700, and a stator structure 500 of the electric machine according to any of the foregoing embodiments.

The housing has a receiving cavity that can provide a mounting location for the rotor structure 600 and the motor stator structure 500. In this embodiment, the housing is cylindrical and includes an end cap 210 and a housing 220, wherein the end cap 210 and the housing 220 are arranged along a first direction. The housing 220 has a cylindrical recess 221, and the end cap 210 is fixedly coupled to the housing 220, and the end surface of the end cap 210 and the recess 221 together define a receiving chamber. Both the cap 210 and the housing 220 are provided with through holes so that the end of the rotation shaft 700 protrudes.

The rotor structure 600 has a rotor shaft hole, and an axial direction of the rotor through hole extends in a first direction. The motor stator structure 500 and the rotor structure 600 together constitute a rotor-stator assembly, the number of which is a plurality, all rotor-stator assemblies being arranged at certain intervals along the first direction, all rotor-stator assemblies being arranged in the receiving cavity of the housing.

The motor stator structure 500 is fixedly coupled to the housing. In this embodiment, the outer peripheral surface of the stator plate 510 is provided with a plurality of protrusions 540, the wall surface of the housing cavity of the housing is provided with a connecting portion, and the protrusions 540 and the connecting portion can be connected by bolts, so that the stator plate 510 is fixed relative to the housing.

The length direction of the rotation shaft 700 is extended along the first direction, the rotation shaft 700 passes through the stator shaft hole and the rotor shaft hole of each rotor-stator assembly, respectively, the end of the rotation shaft 700 passes through the housing, and the rotation shaft 700 is fixedly connected to the rotor structure 600. In this embodiment, the rotor structure 600 may be mounted on the rotating shaft 700 by a key connection manner, so that the rotor structure 600 can rotate together with the rotating shaft 700 about the central axis of the rotating shaft 700 relative to the housing. Of course, it is not excluded that the rotor structure 600 is mounted on the rotation shaft 700 by bolts.

In this embodiment, the rotor structure 600 includes a rotor disc 610 and magnetic rings 620, the number of the magnetic rings 620 is plural, the rotor disc 610 is provided with through holes, the axial direction of the through holes extends along the first direction, the through holes are used for installing the magnetic rings 620, and the through holes are consistent in number with the magnetic rings 620. The center of the rotor disk 610 is provided with a rotor shaft hole, and the plurality of through holes and the plurality of magnetic rings 620 are all arranged in a circular array around the rotor shaft hole of the rotor disk 610. Moreover, the magnetic rings 620 are identical in number to the coil sheets 520. In addition, the extension length of the magnetic ring 620 and the extension length of the coil sheet 520 may be identical.

In the present embodiment, the number of the rotor-stator assemblies is three, and is disposed on the rotation shaft 700 at certain intervals. In the first direction, the aperture of the stator shaft hole of the motor stator structure 500 increases, and at the same time, the aperture of the rotor shaft hole of the rotor structure 600 also increases, and then the rotation shaft 700 is correspondingly provided with a stepped portion, as shown in fig. 4. The axial flux motor is provided with a cable 530, the cable 530 being connected to a coil sheet 520 on the motor stator structure 500. The number of the cables 530 is six, and the cables 530 are respectively and electrically connected with the six coil sheets 520 on each motor stator structure 500, so as to supply power to the coil sheets 520, and at this time, the six cables 530 can respectively correspond to two groups of three-phase wires.

As shown in fig. 4, opposite ends of the rotation shaft 700 are respectively mounted on the housing through bearings 400, so that the rotation shaft 700 can be rotated more smoothly. Also, the housing 220 is provided with sealing caps 100 at opposite sides in the first direction, one sealing cap 100 being mounted on a surface of the end cap 210 remote from the housing 220 by bolts, and the other sealing cap 100 being mounted on a surface of the housing 220 remote from the end cap 210 by bolts. Also, the sealing caps 100 are provided with shaft holes so that the rotation shaft 700 protrudes out of the shaft holes. A sealing ring 300 is provided between the rotation shaft 700 and the shaft hole, and a sealing ring 300 is also provided at a connection surface between the sealing cover 100 and the end cap 210 or the housing 220.

The motor stator structure 500 adopting the structure can solve the problems of large volume and weight, poor heat dissipation effect and low efficiency of the existing axial flux motor, and has the advantages of small volume, light weight, good heat dissipation effect, high efficiency and high working stability.

While the preferred embodiment of the present application has been described in detail, the application is not limited to the embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the application, and these modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.

Claims

1. A motor stator structure, comprising:

2. The motor stator structure of claim 1, wherein each of the coil sheets includes copper wire and a self-adhesive enamel layer, the self-adhesive enamel layer being wrapped around an outer surface of the copper wire.

3. The motor stator structure of claim 1, wherein each of the energized coils has an elliptical shape.

4. The motor stator structure according to claim 1, wherein the number of the coil pieces is a multiple of 3, and three of the coil pieces arbitrarily adjacent to each other are connected with three-phase electric wires.

5. The motor stator structure according to any one of claims 1 to 4, wherein a mounting frame is provided in each of the mounting through holes, the mounting frame is provided with a mounting cavity extending in a first direction and penetrating through opposite surfaces of the mounting frame, and the coil sheet is provided in the mounting cavity and is snap-coupled with the mounting frame.

6. The motor stator structure according to claim 5, wherein the inner peripheral surface of the mounting cavity is provided with a limit rib and a clamping block, the limit rib and the clamping block are arranged at intervals along the first direction and together define a mounting space for accommodating the coil sheet, the clamping block is provided with a plurality of blocks along the inner peripheral surface of the mounting cavity, and a side surface of the clamping block away from the limit rib is provided with a guide inclined surface.

7. The motor stator structure according to claim 6, wherein one of the surfaces of the mounting frame in the first direction extends inward to form the limit rib, the mounting frame is provided with a notch corresponding to each of the clamping blocks, an opening of the notch faces the limit rib, and the notch penetrates through both sides inside and outside the mounting cavity respectively.

8. The motor stator structure of claim 7, wherein each of the mounting holes is provided with two of the mounting brackets arranged in a first direction, and the limit ribs are flush with a surface of the stator plate in the first direction.

9. An axial flux electric machine, comprising:

a housing having a receiving cavity;

a motor stator structure as claimed in any one of claims 1 to 8, fixedly connected to the housing;

10. The axial flux machine of claim 9, wherein the rotor structure includes a rotor disc provided with through-holes for mounting the magnetic rings, and a plurality of magnetic rings disposed in a circular array around the rotor shaft hole, the number of magnetic rings being identical to the number of coil sheets.