Axial flux stator assembly and electric machine

Abstract

The application discloses an axial flux stator assembly and a motor, and belongs to the motor process field.The axial flux stator assembly comprises a machine base, a plurality of stator yokes, a plurality of stator teeth and a plurality of stator windings; the machine base has a cylindrical structure; the plurality of stator yokes are located in the machine base and are distributed at equal intervals along the circumferential direction of the inner wall of the machine base and are connected to the inner wall of the machine base, and the stator yokes are not connected to each other; the stator teeth have a strip-shaped structure, the plurality of stator teeth are located between two adjacent stator yokes, and the middle part of each stator tooth is connected to the stator yokes on both sides; and the plurality of stator windings are wound around the parts close to the two ends of each stator tooth.The axial flux motor adopts the axial flux stator assembly provided by the scheme, so that the probability of local eddy current can be reduced, the eddy current loss of the stator can be reduced, and the working efficiency of the axial flux motor can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, and in particular to an axial flux stator assembly and an electric machine. BACKGROUND

[0002] With the development of science and technology, a double-stator electric machine emerges as the times require. The double-stator electric machine is widely used in people's production and life due to high control accuracy, large acceleration, strong overload capacity, and high mechanical integration degree.

[0003] At present, an axial flux stator assembly in the double-stator electric machine usually includes a stator yoke, a plurality of stator teeth, and a plurality of stator windings. The stator teeth have a strip-shaped structure. Generally, the stator yoke has a plurality of through holes, the plurality of stator teeth respectively pass through the plurality of through holes of the stator yoke, and both ends of the stator teeth protrude from both ends of the through holes, and the stator windings are wound around the portions of the stator teeth protruding from the through holes.

[0004] However, in the related art, the double-stator electric machine is prone to cause local eddy current at the intersection area of the magnetic circuit of the stator tooth and the magnetic circuit of the stator yoke when working, thereby causing eddy current loss of the stator tooth and the stator yoke, and further causing the working efficiency of the double-stator electric machine to be reduced. SUMMARY

[0005] Embodiments of the present application provide an axial flux stator assembly and an electric machine, which can solve the problem of reduced working efficiency of the double-stator electric machine caused by local eddy current in the related art.

[0006] The technical solutions are as follows:

[0007] In a first aspect, the present application provides an axial flux stator assembly, which includes a machine base, a plurality of stator yokes, a plurality of stator teeth, and a plurality of stator windings.

[0008] The machine base has a cylindrical structure.

[0009] The plurality of stator yokes are located in the machine base and are distributed equidistantly along the circumferential direction of the inner wall of the machine base, and are respectively connected to the inner wall of the machine base, and the plurality of stator yokes are not connected to each other.

[0010] The stator teeth have a strip-shaped structure, the plurality of stator teeth are respectively located between two adjacent stator yokes, and the middle part of each stator tooth is respectively connected to the stator yokes on both sides.

[0011] The plurality of stator windings are respectively wound around the portions of each stator tooth close to both ends.

[0012] In a possible implementation, the inner surface of the stator core has a plurality of strip-shaped limiting protrusions, which are distributed equidistantly along the circumferential direction of the inner wall of the stator core, and the length direction of the strip-shaped limiting protrusions is parallel to the axis of the stator core.

[0013] The stator yoke has a limiting through slot on the surface close to the inner wall of the stator core, and each stator yoke is clamped on a strip-shaped limiting protrusion through the limiting through slot.

[0014] In a possible implementation, the inner surface of the stator core has a ring-shaped limiting protrusion connected with each strip-shaped limiting protrusion respectively, and the ring-shaped limiting protrusion is close to the side surface of the strip-shaped limiting protrusion and is in contact with the stator yoke.

[0015] In a possible implementation, each surface of the stator yoke connected with the stator tooth has a first protrusion close to the axis of the stator core and a second protrusion away from the axis of the stator core, and the distance between the first protrusion and the second protrusion in the radial direction of the stator core is equal to the height of the stator tooth in the radial direction of the stator core.

[0016] In a possible implementation, the stator yoke includes a first stator yoke, a yoke portion magnetic separation block, and a second stator yoke, which are arranged in a block structure in sequence.

[0017] In a possible implementation, the stator tooth includes a stator tooth root, a first tooth body, a second tooth body, a first pole shoe, and a second pole shoe.

[0018] The first tooth body and the second tooth body are located at and connected with the first side surface and the second side surface of the stator tooth root respectively.

[0019] The first pole shoe is located at and connected with one end of the first tooth body away from the stator tooth root.

[0020] The second pole shoe is located at and connected with one end of the second tooth body away from the stator tooth root.

[0021] In a possible implementation, the third side surface and the fourth side surface of the stator tooth root are used to be connected with two adjacent stator yokes respectively, and the stator winding is wound on the first tooth body and the second tooth body.

[0022] In a possible implementation, in the direction perpendicular to the third side surface, the distance between the third side surface and the fourth side surface is greater than the width of the first tooth body and greater than the width of the second tooth body.

[0023] In a possible implementation, the third side surface has a third protrusion and a fourth protrusion, the third protrusion and the fourth protrusion are distributed along the axis direction of the stator core, and the distance between the third protrusion and the fourth protrusion in the axis direction of the stator core is equal to the thickness of the stator yoke in the axis direction of the stator core.

[0024] In a possible implementation, the fourth side surface has a fifth protrusion and a sixth protrusion, the fifth protrusion and the sixth protrusion are distributed along the axis direction of the stator core, and the distance between the fifth protrusion and the sixth protrusion in the axis direction of the stator core is equal to the thickness of the stator yoke in the axis direction of the stator core.

[0025] In a possible implementation, the stator tooth further includes a tooth portion magnetic separation block.

[0026] The fifth side surface of the stator tooth root has a through hole, the through hole is located in the middle of the fifth side surface, the tooth portion magnetic separation block is located in the through hole, and is connected with the inner wall of the through hole.

[0027] In a second aspect, the application provides an electric machine, which includes the axial flux stator assembly as described in any one of the first aspect and possible implementation manners thereof.

[0028] The technical scheme provided by the embodiments of the application has the following beneficial effects:

[0029] In the scheme provided by the embodiments of the application, the axial flux stator assembly includes a stator core, a plurality of stator yokes, a plurality of stator teeth, and a plurality of stator windings, wherein the plurality of stator yokes are not connected with each other, and the plurality of stator teeth are located between adjacent two stator yokes. When the electric machine adopts the axial flux stator assembly provided by the scheme, there is no stator yoke on both sides of the stator tooth along the radial direction of the stator core, so that no leakage magnetic field perpendicular to the silicon steel sheet plane of the stator yoke is generated on both sides of the stator tooth along the radial direction of the stator core, and the edge magnetic field and the leakage magnetic field near the region where the stator tooth and the stator yoke magnetic circuit intersect in the circumferential direction of the stator core are parallel to the silicon steel sheet plane of the stator tooth and the silicon steel sheet plane of the stator yoke, thereby reducing the risk of local eddy current, being conducive to reducing the eddy current loss of the stator, and further being conducive to improving the working efficiency of the electric machine.

[0030] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0032] Figure 1 is a structural schematic diagram of an axial flux stator assembly in the related art;

[0033] Figure 2 is a structural schematic diagram of an axial flux stator assembly provided by an embodiment of the present application;

[0034] Figure 3 is a partial structural schematic diagram of an axial flux stator assembly provided by an embodiment of the present application;

[0035] Figure 4 is a structural schematic diagram of a machine base provided by an embodiment of the present application;

[0036] Figure 5 is a partial structural schematic diagram of an axial flux stator assembly provided by an embodiment of the present application;

[0037] Figure 6 is a partial structural schematic diagram of an axial flux stator assembly provided by an embodiment of the present application;

[0038] Figure 7 is a structural schematic diagram of a stator yoke provided by an embodiment of the present application;

[0039] Figure 8 is a structural schematic diagram of a stator tooth provided by an embodiment of the present application;

[0040] Figure 9 is a side view of a stator tooth provided by an embodiment of the present application;

[0041] Figure 10 is an exploded view of a partial structure of an axial flux stator assembly provided by an embodiment of the present application;

[0042] Figure 11 is an exploded view of a partial structure of an axial flux stator assembly provided by an embodiment of the present application;

[0043] Figure 12 is a structural schematic diagram of a stator tooth provided by an embodiment of the present application;

[0044] Figure 13 is a structural schematic diagram of an electric machine provided by an embodiment of the present application.

[0045] Legend

[0046] 1, base; 11, strip-shaped limiting protrusion; 12, ring-shaped limiting protrusion;

[0047] 2, stator yoke; 2A, limiting through slot; 2B, first protrusion; 2C, second protrusion; 21, first stator yoke; 22, yoke portion magnetic separation block; 23, second stator yoke;

[0048] 3, stator tooth; 31, stator tooth root; 32, first tooth body; 33, second tooth body; 34, first pole shoe; 35, second pole shoe; 36, tooth portion magnetic separation block; 31A, first side surface; 31B, second side surface; 31C, third side surface; 31D, fourth side surface; 31E, third protrusion; 31F, fourth protrusion; 31G, fifth protrusion; 31H, sixth protrusion; 31I, fifth side surface; 31J, through hole;

[0049] 4, stator winding;

[0050] 01, axial flux stator assembly; 02, first rotor; 03, second rotor. DETAILED DESCRIPTION

[0051] Unless otherwise defined, technical terms or scientific terms used herein shall have the ordinary meanings as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first", "second", "third", and the like as used in the specification and claims herein do not denote any order, quantity, or importance, but are used to distinguish one element from another. Similarly, the terms "one", "another", and the like do not denote a quantity of any number of one, but rather denote the presence of at least one. The terms "comprise", "comprising", "include", "including", and the like are used herein to mean including but not limited to. The term "connected" or "coupled" or the like is used herein to mean either a physical or electrical connection or coupling, whether direct or indirect, between or among two or more elements. The terms "upper", "lower", "left", "right", and the like are used herein for ease of description to describe the orientations of elements in the drawings. These relative terms can change when the absolute positions of the described objects change.

[0052] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0053] The double-stator motor is widely used in people's production and life due to its high control accuracy, large acceleration, strong overload capacity, and high mechanical integration degree. Figure 1 is a structural schematic diagram of an axial flux stator assembly in the related art, as Figure 1As shown, the axial flux stator assembly in the double-stator motor generally comprises a stator yoke, a plurality of stator teeth and a plurality of stator windings, the stator yoke has a ring structure, and the stator teeth have a strip structure. Among them, the stator yoke has a plurality of through holes, the plurality of stator teeth respectively pass through the plurality of through holes of the stator yoke, and the side surface of the stator tooth is perpendicular to the surface of the stator yoke part, and the two ends of the stator tooth protrude from the two ends of the through hole, and the stator winding is wound on the part of the stator tooth protruding from the through hole.

[0054] However, in the related art, since the stator yoke is a ring-shaped whole, a leakage magnetic field perpendicular to the planes of the stator teeth and the stator yoke silicon steel sheet is generated in the radial direction of the stator yoke, and an edge magnetic field and a leakage magnetic field perpendicular to the plane of the stator yoke silicon steel sheet are generated in the circumferential direction of the stator yoke, which causes local eddy current near the area where the stator teeth and the stator yoke magnetic circuit intersect, resulting in eddy current loss of the stator teeth and the stator yoke, thereby reducing the working efficiency of the double-stator motor. The axial flux stator assembly provided by the embodiments of the present application can solve the problem of reduction of the working efficiency of the double-stator motor caused by local eddy current in the related art.

[0055] In addition, the axial flux stator assembly provided by the present application also adopts a "hui" shaped columnar stator tooth root structure symmetrical in horizontal and vertical directions, and fills the tooth part magnetic separation block in the form of a flat column inside the stator tooth root, which not only can realize the integrated processing of the stator teeth and simplify the process, but also can work together with the yoke part magnetic separation block arranged in the middle of the stator yoke to realize the magnetic circuit isolation of the two sides of the back-to-back stator structure.

[0056] Next, the axial flux stator assembly provided by the embodiments of the present application will be described in detail.

[0057] Figure 2 is a structural schematic diagram of an axial flux stator assembly provided by the embodiments of the present application, Figure 3 is a partial structural schematic diagram of an axial flux stator assembly provided by the embodiments of the present application. As Figure 2 and Figure 3 As shown, the axial flux stator assembly comprises a base 1, a plurality of stator yokes 2, a plurality of stator teeth 3 and a plurality of stator windings 4, wherein the base 1 has a cylindrical structure, each stator yoke 2 and each stator tooth 3 are made of silicon steel sheet laminated.

[0058] The plurality of stator yokes 2 are located in the base 1, and the plurality of stator yokes 2 are distributed equidistantly along the circumferential direction of the inner wall of the base 1, for example, when the axial flux stator assembly comprises 12 stator yokes 2, the included angle of the center lines of the adjacent two stator yokes 2 is 30 degrees, for another example, when the axial flux stator assembly comprises 6 stator yokes 2, the included angle of the center lines of the adjacent two stator yokes 2 is 60 degrees, and so on. Each stator yoke 2 is connected with the inner wall of the base 1, and the plurality of stator yokes 2 are not connected with each other.

[0059] As an example, the stator yoke 2 has a sector block structure, and the sector block structure has two opposite arc-shaped surfaces, the orthographic projection of the two arc-shaped surfaces in the radial interface of the stator core 1 is two arcs, the arc-shaped surface corresponding to the arc with a longer arc length is connected with the inner wall of the stator core 1, and the arc-shaped surface corresponding to the arc with a shorter arc length is close to the axis of the stator core 1. Of course, the stator yoke 2 can also have a trapezoidal block structure, an elliptical block structure, and the like, in other words, the orthographic projection of the stator yoke 2 on the radial section of the stator core 1 can be a trapezoid, an ellipse, and the like. No limitation is made here on the shape of the stator yoke 2.

[0060] The stator tooth 3 has a strip structure, and a plurality of stator teeth 3 are respectively located between two adjacent stator yokes 2, in other words, a plurality of stator teeth 3 are located in the stator core 1 and are distributed at equal intervals along the circumferential direction of the stator core 1. The middle part of each stator tooth 3 is connected with the two stator yokes 2 on the sides, respectively, and the plurality of stator teeth 3 are not connected with each other. The specific structure of the stator tooth 3 will be described below.

[0061] In the axial direction of the stator core 1, the length of the stator tooth 3 is greater than the length of the stator yoke 2, and the stator tooth 3 protrudes on both sides of the stator yoke 2. As an example, the length of the stator tooth 3 protruding on both sides of the stator yoke 2 along the axial direction of the stator core 1 can be the same or different, and can be designed according to actual product requirements. No limitation is made here. The two ends of the stator tooth 3 protruding from the stator yoke 2 are wound with the stator winding 4, in other words, a plurality of stator windings 4 are wound on the part close to the two ends of each stator tooth 3.

[0062] With this scheme, the axial flux stator assembly includes: a stator core 1, a plurality of stator yokes 2, a plurality of stator teeth 3, and a plurality of stator windings 4, wherein the plurality of stator yokes 2 are not connected with each other, and the plurality of stator teeth 3 are respectively located between two adjacent stator yokes. In the motor using the axial flux stator assembly provided in the embodiments of the present application, compared with the related art, no leakage magnetic field perpendicular to the silicon steel sheet plane of the stator yoke 2 is generated on both sides of the stator tooth 3 along the radial direction of the stator core 1, and on both sides of the stator tooth 3 along the circumferential direction of the stator core 1, the edge magnetic field and the leakage magnetic field near the region where the magnetic circuit of the stator tooth 3 and the stator yoke 2 intersects are parallel to the silicon steel sheet plane of the stator tooth 3 and the silicon steel sheet plane of the stator yoke 2, thereby reducing the risk of local eddy current, which is conducive to reducing the eddy current loss of the stator, and further, is conducive to improving the working efficiency of the motor.

[0063] Next, the various components of the axial flux stator assembly provided in the embodiments of the present application and the relationship between the various components will be described in detail.

[0064] Stator core 1

[0065] Figure 4is a structural schematic diagram of a machine base provided by an embodiment of the present application, Figure 5 is a partial structural schematic diagram of an axial flux stator assembly provided by an embodiment of the present application.

[0066] In some examples, as shown in Figure 4 and Figure 5 The inner surface of the machine base 1 has a plurality of strip-shaped limiting protrusions 11, the number of the strip-shaped limiting protrusions 11 is equal to the number of the stator yokes 2, i.e., the number of the strip-shaped limiting protrusions 11 is equal to the number of the stator slots of the axial flux stator assembly, and the length direction of the strip-shaped limiting protrusions 11 is parallel to the axis of the machine base 1. The plurality of strip-shaped limiting protrusions 11 are distributed equidistantly along the circumferential direction of the inner wall of the machine base 1, and each of the plurality of strip-shaped limiting protrusions 11 is connected to the inner wall of the machine base 1.

[0067] In this case, each of the stator yokes 2 has a limiting slot 2A on the surface close to the inner wall of the machine base 1, and each of the stator yokes 2 is clamped on one of the strip-shaped limiting protrusions 11 through the limiting slot 2A. As an example, the limiting slot 2A can pass through the opposite surfaces of the stator yoke 2 in the axis direction of the machine base 1, and during installation, only the slot on one surface of the stator yoke 2 is needed to be opposite to one end of the strip-shaped limiting protrusion 11, and then the stator yoke 2 is pushed along the axis direction of the machine base 1, so that the limiting slot 2A is completely clamped on the strip-shaped limiting protrusion 11, i.e., the installation is completed.

[0068] The stator yoke 2 and the strip-shaped limiting protrusion 11 can be fixedly connected in an interference fit manner, i.e., the size of the profile of the strip-shaped limiting protrusion 11 is slightly larger than the size of the inner wall profile of the limiting slot 2A. By using this scheme, the stability of the stator yoke 2 on the machine base 1 can be ensured, thereby ensuring the reliability of the motor during operation of the axial flux stator assembly. Moreover, by using the interference fit manner, there is no need to set other components for connection, which is conducive to reducing the cost of the entire axial flux stator assembly. Alternatively, the stator yoke 2 and the strip-shaped limiting protrusion 11 can also be fixedly connected by gluing or other ways, and no limitation is made herein to the fixing manner between the stator yoke 2 and the strip-shaped limiting protrusion 11.

[0069] As an example, in the axis direction of the machine base 1, the length of the strip-shaped limiting protrusion 11 can be greater than or equal to the length of the limiting slot 2A, which is conducive to improving the stability of the stator yoke 2 on the machine base 1. Alternatively, in the axis direction of the machine base 1, the length of the strip-shaped limiting protrusion 11 can also be less than the length of the limiting slot 2A, which is conducive to reducing the machining difficulty of the machine base 1 and the production cost of the entire axial flux stator assembly.

[0070] As an example, the strip-shaped limiting protrusion 11 can have a trapezoidal structure, in other words, in the radial cross section of the stator core 1, the orthographic projection of the strip-shaped limiting protrusion 11 can be approximately considered as a trapezoid, and the upper base of the trapezoid is connected with the stator core 1. Correspondingly, the limiting through slot 2A on the stator yoke 2 has a trapezoidal structure, for cooperating with the strip-shaped limiting protrusion 11.

[0071] Alternatively, the orthographic projection of the strip-shaped limiting protrusion 11 in the radial cross section of the stator core 1 can have a semicircular shape, a square shape, a triangular shape, an elliptical shape, etc., and correspondingly, in the radial cross section of the stator core 1, the orthographic projection of the limiting through slot 2A has the same shape as the orthographic projection of the strip-shaped limiting protrusion 11.

[0072] In some examples, as shown in Figs. 1 and 2, the inner surface of the stator core 1 has a plurality of strip-shaped limiting protrusions 11, and the strip-shaped limiting protrusions 11 are arranged in the circumferential direction of the stator core 1. Figure 4 and Figure 5 As shown in Figs. 1 and 2, the inner surface of the stator core 1 has a plurality of strip-shaped limiting protrusions 11, and the strip-shaped limiting protrusions 11 are arranged in the circumferential direction of the stator core 1. The strip-shaped limiting protrusions 11 are located on one side of the stator yoke 2, and are connected with each of the strip-shaped limiting protrusions 11. In the axial magnetic flux stator assembly, the side of the strip-shaped limiting protrusion 11 close to the stator yoke 2 is in contact with the stator yoke 2, so as to limit the movement of the stator yoke 2 along the axis of the stator core 1.

[0073] As an example, in the axis direction of the stator core 1, the length of the strip-shaped limiting protrusion 11 and the length of the annular limiting protrusion 12 are the same, and the sum of the length of the strip-shaped limiting protrusion 11 and the length of the annular limiting protrusion 12 can be equal to the axial length of the stator core 1. In the radial direction of the stator core 1, the height of the annular limiting protrusion 12 can be less than or equal to the height of the strip-shaped limiting protrusion 11.

[0074] Alternatively, in the axis direction of the stator core 1, the length of the strip-shaped limiting protrusion 11 and the length of the annular limiting protrusion 12 can be different. In the axis direction of the stator core 1, the sum of the length of the strip-shaped limiting protrusion 11 and the length of the annular limiting protrusion 12 can not be equal to the axial length of the stator core 1. In the radial direction of the stator core 1, the height of the annular limiting protrusion 12 can be greater than the height of the strip-shaped limiting protrusion 11. For the size of the strip-shaped limiting protrusion 11 and the size of the annular limiting protrusion 12 described above, they can be designed according to the actual product requirements, and no limitation is made herein.

[0075] Optionally, the base 1 can not have the annular limiting protrusion 12, but can have a plurality of limiting protrusions with a strip structure, the limiting protrusions are distributed along the circumferential direction of the inner wall of the base 1, and each limiting protrusion is connected with the inner wall of the base 1. The limiting protrusions can be distributed on both sides of the strip limiting protrusion 11 along the circumferential direction of the inner wall of the base 1, and only need to ensure that the limiting protrusions are in contact with the surface of the stator yoke 2 when the stator yoke 2 is installed in the base 1, thereby playing a role of limiting the movement of the stator yoke 2 in the axial direction of the base 1.

[0076] In some examples, the base 1 can also include an annular auxiliary limiting protrusion, the axis of the annular auxiliary limiting protrusion coincides with the axis of the base 1, that is, the annular auxiliary limiting protrusion is located in the base 1, and the outer surface of the annular limiting protrusion 12 is connected with the inner surface of the base 1. The annular auxiliary limiting protrusion is detachably connected with the base 1. After the stator yoke 2 and the stator teeth 3 are installed on the base 1, the annular auxiliary limiting protrusion can be installed on the side of the stator yoke 2 away from the annular limiting protrusion 12, ensuring that the annular auxiliary limiting protrusion is in contact with the surface of the stator yoke 2 away from the annular limiting protrusion 12, and then the annular auxiliary limiting protrusion is detachably connected with the inner surface of the base 1. By using this scheme, the stability between the stator yoke 2 and the base 1 can be further increased, and the annular auxiliary limiting protrusion and the base 1 are detachably connected, which is convenient for the installation of the axial flux stator assembly.

[0077] Optionally, the inner wall of the base 1 can have a plurality of installation grooves, the plurality of installation grooves are equidistantly distributed along the circumferential direction of the inner wall of the base 1, the grooves of the plurality of installation grooves are located at one end of the base 1, and the grooves do not penetrate through the entire base 1. In the radial section of the base 1, the orthogonal projection of the installation groove matches part of the orthogonal projection of the stator yoke 2, in other words, the orthogonal projection of the installation groove coincides with part of the orthogonal projection of the stator yoke 2. In this way, when the stator yoke 2 is installed, the stator yoke 2 can be first placed opposite the groove of the installation groove, and then the stator yoke 2 is pushed along the axis of the base 1, so that one surface of the stator yoke 2 is in contact with the surface of the installation groove opposite the groove, and the installation of the stator yoke 2 is completed.

[0078] Optionally, each stator yoke 2 has an installation protrusion on the surface close to the base 1, and in the radial section of the base 1, the orthogonal projection of the installation groove matches the orthogonal projection of the installation protrusion of the stator yoke 2, that is, the stator yoke 2 can be installed in the installation groove through the installation protrusion, thereby completing the installation of the stator yoke 2 on the base 1. The connection mode between the stator yoke 2 and the base 1 is not limited here, as long as the stability between the stator yoke 2 and the base 1 is ensured.

[0079] The stator yoke 2

[0080] Figure 6is a local structure schematic view of an axial flux stator assembly provided by an embodiment of the present application. As shown in Figure 5 and Figure 6 shown, in the radial section of the machine base 1, the orthographic projection of the stator yoke 2 can be approximately considered as a sector, and the two sides of the stator yoke 2 corresponding to the two sides of the sector are used to be connected with the stator teeth 3.

[0081] Each surface of the stator yoke 2 connected with the stator teeth 3 has a first protrusion 2B and a second protrusion 2C, and on one of the two surfaces, the first protrusion 2B is located on the side of the stator yoke 2 close to the axis of the machine base 1, and the second protrusion 2C is located on the side of the stator yoke 2 away from the axis of the machine base 1, and the corresponding structure is just as shown in Figure 5 or Figure 6 The distance D1 of the first protrusion 2B and the second protrusion 2C on the same surface in the radial direction of the machine base 1 is equal to the height H1 of the stator teeth 3 in the radial direction of the machine base 1, wherein the distance D1 between the first protrusion 2B and the second protrusion 2C is the distance between the two opposite surfaces of the first protrusion 2B and the second protrusion 2C. With this scheme, the stator teeth 3 can be just clamped between the first protrusion 2B and the second protrusion 2C, so as to realize the fixation of the stator teeth 3 relative to the machine base 1.

[0082] Alternatively, the distance D1 between the first protrusion 2B and the second protrusion 2C can be slightly smaller than the height H1 of the stator teeth 3, so that when the stator yoke 2 and the stator teeth 3 are assembled, they can be fixed in an interference fit manner, thereby facilitating the improvement of the stability between the stator yoke 2 and the stator teeth 3. Of course, the surfaces of the stator yoke 2 and the stator teeth 3 can be coated with glue, and the stator yoke 2 and the stator teeth 3 can be kept stable under the action of the glue, so as to better ensure the stability between the stator yoke 2 and the stator teeth 3. The connection mode between the stator yoke 2 and the stator teeth 3 is not limited here.

[0083] Figure 7 is a structure schematic view of a stator yoke provided by an embodiment of the present application. As shown in Figure 7 , the stator yoke 2 can include a first stator yoke 21, a yoke portion magnetic separation block 22, and a second stator yoke 23. The first stator yoke 21, the yoke portion magnetic separation block 22, and the second stator yoke 23 are arranged in a stacked manner to form a block structure, so as to form the stator yoke 2 in the axial flux stator assembly provided by an embodiment of the present application.

[0084] With this scheme, the stator yoke 2 can be made of a plurality of layers of materials, and the stator yoke 2 can be made of a plurality of materials, so as to improve the performance of the stator yoke 2. Figure 3As shown, after the stator assembly is assembled by assembling the stator base 1, the plurality of stator yokes 2 and the plurality of stator teeth 3, the yoke portion magnetic isolation blocks 22 of each stator yoke 2 are located on the same radial section of the stator base 1, so that two stator yoke sub-blocks can be formed on both sides of the radial section along the axial direction of the stator base 1. One of the two stator yoke sub-blocks is composed of a plurality of first stator yokes 21, and the other stator yoke sub-block is composed of a plurality of second stator yokes 23. The two stator yoke sub-blocks can be used to drive different motor rotors, respectively. In addition, the plurality of yoke portion magnetic isolation blocks 22 can realize magnetic isolation between the two stator yoke sub-blocks, thereby further ensuring the reliability of driving different motor rotors to work.

[0085] In some examples, the thickness of the first stator yoke 21 and the thickness of the second stator yoke 23 can be the same, so that the two axial flux stator assemblies can be symmetrically distributed, which is beneficial to ensure that the stators on both sides have the same driving capacity to the rotors. In addition, the structure is beneficial to reduce the processing difficulty of the first stator yoke 21 and the second stator yoke 23, thereby improving the production efficiency. Alternatively, the thickness of the first stator yoke 21 and the thickness of the second stator yoke 23 can be different. By using this scheme, the structure of the axial flux stator assembly can be more flexible to adapt to a variety of different use scenarios, which is beneficial to improve the applicability of the motor using the axial flux stator assembly.

[0086] In some examples, as shown in Figure 6 and Figure 7 The stator yoke 2 can be made of a plurality of silicon steel sheets stacked together, in other words, a plurality of silicon steel sheets are arranged in a block structure in a stacked manner to form the stator yoke 2. The plurality of silicon steel sheets can first be stacked to form the first stator yoke 21 and the second stator yoke 23, respectively, and then the first stator yoke 21, the yoke portion magnetic isolation block 22 and the second stator yoke 23 are stacked together to form the stator yoke 2. Each silicon steel sheet, the first stator yoke 21 and the yoke portion magnetic isolation block 22, and the yoke portion magnetic isolation block 22 and the second stator yoke 23 can be fixed by gluing or other methods, thereby ensuring the stability of the internal structure of the stator yoke 2.

[0087] Each silicon steel sheet has a sector plate structure, and the thickness of the silicon steel sheet can be 0.1mm, 0.2mm, 0.5mm, 1mm, 2mm, etc. The thickness of the silicon steel sheet can be set according to actual product requirements, which is not limited here.

[0088] The stator yoke 2 is made of a plurality of silicon steel sheets stacked together, which is beneficial to reduce the difficulty of the processing technology of the stator yoke 2 and the difficulty of the assembly process of the stator yoke 2, which is beneficial to realize mass production, thereby improving the production efficiency of the stator yoke 2.

[0089] The stator teeth 3

[0090] Figure 8 is a structural schematic diagram of a stator tooth provided by an embodiment of the present application, Figure 9 is a side view of a stator tooth provided by an embodiment of the present application. As shown in Figure 8 and Figure 9 shown, the stator tooth 3 includes a stator tooth root 31, a first tooth body 32, a second tooth body 33, a first pole shoe 34, and a second pole shoe 35, and the stator tooth 3 as a whole has a block structure.

[0091] The stator tooth root 31 has a cuboid structure. The first tooth body 32 and the second tooth body 33 are respectively located at a first side surface 31A and a second side surface 31B of the stator tooth root 31, and are respectively connected with the first side surface 31A and the second side surface 31B. For example, the first tooth body 32 is connected with the first side surface 31A, and the second tooth body 33 is connected with the second side surface 31B, or the first tooth body 32 is connected with the second side surface 31B, and the second tooth body 33 is connected with the first side surface 31A. The first pole shoe 34 is located at an end of the first tooth body 32 away from the stator tooth root 31, and the first pole shoe 34 is connected with the first tooth body 32. The second pole shoe 35 is located at an end of the second tooth body 33 away from the stator tooth root 31, and is connected with the second tooth body 33.

[0092] In some examples, in a direction perpendicular to the third side surface 31C, i.e. in the length direction O shown in Figure 9 , the distance D2 between the third side surface 31C and the fourth side surface 31D is greater than the width W1 of the first tooth body 32 and greater than the width W2 of the second tooth body 33. With this scheme, it can be effectively ensured that, in the region near the magnetic path interaction between the stator yoke 2 and the stator tooth 3 of the axial flux stator assembly, the leakage magnetic field is parallel to the silicon steel sheet plane of the stator yoke 2 and parallel to the silicon steel sheet plane of the stator tooth 3, and the leakage magnetic field enters the two side surfaces (i.e. the first side surface 31A and the second side surface 31B) of the stator tooth root 31 in the axial direction of the stator yoke 2 from the two sides of the tooth body of the stator tooth 3 in the circumferential direction of the stator yoke 2, so that no local eddy current loss is generated in the stator yoke 2, and meanwhile, the main magnetic circuit of the motor is not affected.

[0093] In some examples, the length of the first tooth body 32 can be equal to the length of the second tooth body 33, in other words, the distance between the first pole shoe 34 and the stator tooth root 31 can be equal to the distance between the second pole shoe 35 and the stator tooth root 31. Alternatively, the length of the first tooth body 32 can be different from the length of the second tooth body 33, and no limitation is made herein to the shape and size of each part of the stator tooth 2.

[0094] In some examples, the stator teeth 3 can be made of multiple stacked silicon steel sheets; in other words, multiple silicon steel sheets are stacked and arranged in a block structure to form the stator teeth 3. Each silicon steel sheet has a plate-like structure, and the thickness of the silicon steel sheet can be 0.1 mm, 0.2 mm, 0.5 mm, 1 mm, 2 mm, etc. No limitation is made here regarding the thickness of the silicon steel sheets. The thickness of the silicon steel sheets in the stator teeth 3 can be the same as the thickness of the silicon steel sheets in the stator yoke 2, or the thickness of the silicon steel sheets in the stator teeth 3 can be different from the thickness of the silicon steel sheets in the stator yoke 2; no limitation is made here.

[0095] Each silicon steel sheet has a stator tooth root 31, a first tooth body 32, a second tooth body 33, a first pole shoe 34, and a second pole shoe 35. The stator tooth root 31, first tooth body 32, second tooth body 33, first pole shoe 34, and second pole shoe 35 in the same silicon steel sheet are integrally formed. When multiple silicon steel sheets are stacked, they form... Figure 8 The stator tooth root 31, first tooth body 32, second tooth body 33, first pole shoe 34, and second pole shoe 35 shown herein form the aforementioned stator tooth 3.

[0096] The stator teeth 3 are made of multiple silicon steel sheets stacked together, which helps to reduce the difficulty of the processing technology of stator teeth 3 and the assembly technology of stator teeth 3, and facilitates mass production, thereby improving the production efficiency of stator teeth 3.

[0097] As an example, such as Figure 9 As shown, stator tooth 3 has a king-shaped structure. Along... Figure 9 In the length direction O shown, the length of the stator tooth root 31 is greater than the length of the first tooth body 32, the length of the second tooth body 33 is equal to the length of the first tooth body 32, the length of the first pole shoe 34 is equal to the length of the second pole shoe 35, and the length of the first pole shoe 34 is greater than the length of the first tooth body 32. Using this scheme, along the... Figure 9 In the length direction O shown, the length of the first tooth 32 and the length of the second tooth 33 are relatively shorter. On the one hand, this helps to reduce the size of the stator winding 4 after it is wound on the tooth. On the other hand, after the stator winding 4 is wound on the tooth, the pole shoe and tooth root can limit the stator winding to prevent the stator winding 4 from falling off the tooth.

[0098] Figure 10 This is an exploded view of a partial structure of an axial flux stator assembly provided in an embodiment of this application. For example... Figure 10 As shown, the stator tooth root 31 of the stator tooth 3 also has a third side 31C and a fourth side 31D, which are respectively used to connect with two adjacent stator yokes 2; stator windings 4 are wound on the first tooth body 32 and the second tooth body 33 of the stator tooth 3.

[0099] Figure 11 is an exploded view of a partial structure of an axial flux stator assembly provided by an embodiment of the present application. As shown in Figure 11 , the third side surface 31C of the stator tooth root 31 has a third protrusion 31E and a fourth protrusion 31F, and the third protrusion 31E is close to the first side surface 31A and the fourth protrusion 31F is away from the first side surface 31A, the third protrusion 31E and the fourth protrusion 31F are connected with the third side surface 31C respectively, and the distance D3 between the third protrusion 31E and the fourth protrusion 31F in the axial direction of the machine base 1 is equal to the thickness T1 of the stator yoke 2 in the axial direction of the machine base 1. The distance D3 between the third protrusion 31E and the fourth protrusion 31F, that is, the distance between the two opposite surfaces of the third protrusion 31E and the fourth protrusion 31F.

[0100] As shown in Figure 11 , the fourth side surface 31D of the stator tooth root 31 has a fifth protrusion 31G and a sixth protrusion 31H, and the fifth protrusion 31G is close to the first side surface 31A and the sixth protrusion 31H is away from the first side surface 31A, the fifth protrusion 31G and the sixth protrusion 31H are connected with the fourth side surface 31D respectively, and the distance D4 between the fifth protrusion 31G and the sixth protrusion 31H in the axial direction of the machine base 1 is equal to the thickness T1 of the stator yoke 2 in the axial direction of the machine base 1. The distance D4 between the fifth protrusion 31G and the sixth protrusion 31H, that is, the distance between the two opposite surfaces of the fifth protrusion 31G and the sixth protrusion 31H.

[0101] With this scheme, the stator yoke 2 can be just clamped between the third protrusion 31E and the fourth protrusion 31F, or just clamped between the fifth protrusion 31G and the sixth protrusion 31H, so as to realize the fixation of the stator tooth 3 relative to the stator yoke 2 and the machine base 1.

[0102] Alternatively, the distance D3 between the third protrusion 31E and the fourth protrusion 31F can be slightly smaller than the thickness T1 of the stator yoke 2, and the distance D3 between the fifth protrusion 31G and the sixth protrusion 31H can also be slightly smaller than the thickness T1 of the stator yoke 2, so that the stator yoke 2 and the third side surface 31C and the fourth side surface 31D are all in interference fit, which is conducive to improving the stability between the stator yoke 2 and the stator tooth 3. Of course, the stator yoke 2 and the third side surface 31C and the fourth side surface 31D can also be fixed by gluing, which will not be described here.

[0103] Figure 12 is a structural schematic diagram of a stator tooth provided by an embodiment of the present application. As shown in Figure 12 , the stator tooth root 31 also has opposite fifth side surface 31I and sixth side surface Figure 12 (not shown in the figure), and the stator tooth 3 also includes a tooth portion magnetic separation block 36.

[0104] The fifth side 31I of the stator tooth root 31 has a through hole 31J perpendicular to the fifth side 31I. The through hole 31J penetrates from the fifth side 31I to the sixth side, so that the stator tooth root 31 forms a "hui"-shaped columnar structure. The through hole 31J is located in the middle of the fifth side 31I. There is a certain gap between the inner wall of the through hole 31J close to the third side 31C and the third side 31C, and there is also a certain gap between the inner wall of the through hole 31J close to the fourth side 31D and the fourth side 31D. Through the above gaps, the integrity of the first tooth body 32 and the second tooth body 33 can be ensured. In some examples, the fifth side 31I of the stator tooth root 31 is symmetric both in the horizontal direction and in the vertical direction.

[0105] The tooth part magnetic isolation block 36 is located in the through hole 31J and is connected to the inner wall of the through hole 31J. In some examples, the tooth part magnetic isolation block 36 is in interference fit with the through hole 31J to ensure the stability of the tooth part magnetic isolation block 36 in the through hole 31J. In some other examples, the tooth part magnetic isolation block 36 and the through hole 31J can be fixedly connected by means such as gluing, so as to ensure the stability of the tooth part magnetic isolation block 36 in the through hole.

[0106] As Figure 3 shown, after assembling the machine base 1, multiple stator yokes 2 and multiple stator teeth 3 into an axial flux stator assembly, the tooth part magnetic isolation block 36 is located in the through hole 31J of the stator tooth root 31 with a "hui"-shaped columnar structure. The tooth part magnetic isolation block 36 of each stator tooth 3 and the yoke part magnetic isolation block 22 of each stator yoke 2 are located in the same radial section of the machine base 1. In this way, two stator teeth can be formed on both sides of the radial section along the axis direction of the machine base 1 to drive different motor rotors to move. Adopting this scheme can not only realize the integral processing of the stator teeth 3 and simplify the process, but also work together with the yoke part magnetic isolation block 22 arranged in the middle of the stator yoke to realize the magnetic circuit isolation on both sides of the back-to-back stator structure. Thus, the reliability when driving different motor rotors to work is further ensured.

[0107] Stator winding 4

[0108] In the axial flux stator assembly provided by the embodiment of the present application, the stator winding 4 can adopt a concentrated winding. Each stator winding 4 can be wound on the first tooth body 32 or the second tooth body 33 of the above-mentioned stator tooth 3. The stator winding 4 can be composed of multiple coils or coil groups. The stator winding 4 can be made of copper wire or the like. Optionally, each stator winding 4 can also be wound on multiple first tooth bodies 32 or multiple second tooth bodies 33. There is no any limitation on the stator winding 4 here.

[0109] Adopting the scheme, the axial flux stator assembly comprises a base 1, a plurality of stator yokes 2, a plurality of stator teeth 3, and a plurality of stator windings 4, wherein the plurality of stator yokes 2 are distributed equidistantly along the circumferential direction of the inner wall of the base 1, and the plurality of stator yokes 2 are not connected to each other. When the motor adopts the axial flux stator assembly provided by the scheme, there is no stator yoke on the two sides of the stator teeth along the radial direction of the base, so that no leakage magnetic field perpendicular to the silicon steel sheet plane of the stator yoke is generated on the two sides of the stator teeth along the radial direction of the base, and the edge magnetic field and the leakage magnetic field near the region where the stator teeth and the stator yoke magnetic circuit intersect on the two sides of the stator teeth along the circumferential direction of the base are parallel to the silicon steel sheet plane of the stator teeth and the silicon steel sheet plane of the stator yoke, so that the risk of local eddy current can be reduced, the eddy current loss of the stator can be reduced, and the working efficiency of the motor can be improved.

[0110] In addition, the axial flux stator assembly provided by the application also adopts the "h" shaped columnar stator tooth root structure symmetrical in the horizontal and vertical directions, and fills the tooth portion magnetic isolation block in the form of a flat column in the stator tooth root, which not only can realize the integrated processing of the stator teeth and simplify the process, but also can realize the magnetic circuit isolation on the two sides of the back-to-back stator structure together with the yoke portion magnetic isolation block arranged in the axial middle of the yoke portion main body.

[0111] Based on the same technical concept, the application provides an electric motor, Figure 13 is a structural schematic diagram of an electric motor provided by an embodiment of the application. As shown in the figure, Figure 13 The first rotor 02 and the second rotor 03 are respectively arranged opposite to the axial flux stator assembly 01, and the first rotor 02 and the second rotor 03 are respectively connected to an output shaft. The first rotor 02, the second rotor 03 and the axial flux stator assembly 01 are used in cooperation to output power to the outside through the output shaft.

[0112] The motor may further include a housing. The axial-flux stator assembly 01, the first rotor 02, and the second rotor 03 are all located inside the housing. The frame 1 of the axial-flux stator assembly 01 may be fixedly connected to the inner wall of the housing. On both sides of the housing in the axial direction of the axis of the frame 1, there is respectively an installation hole. The axis of the installation hole coincides with the axis of the first rotor 02 or the second rotor 03. The output shafts connected to the first rotor 02 and the second rotor 03 respectively protrude from the housing through the two installation holes for connection with external components. Moreover, the output shaft connected to the first rotor 02 and the housing are rotationally connected, and the output shaft connected to the second rotor 03 and the housing are rotationally connected. The specific structure is similar to that of the motor in the related art and will not be elaborated here.

[0113] With this solution, the motor can achieve simultaneous output of two output shafts, which is beneficial to enhancing the applicability of the motor and improving the working efficiency of the motor. Moreover, adopting this axial-flux stator assembly can reduce the eddy current loss of the stator teeth and the stator yoke, which is beneficial to reducing the maintenance cost and improving the working efficiency of the motor. In addition, the stator tooth root in the axial-flux stator assembly adopts a "return" - shaped columnar structure that is symmetric in the horizontal and vertical directions, which can not only achieve the integrated processing of the stator teeth, simplify the processing technology, but also act together with the yoke magnetic isolation block arranged in the middle of the axial direction of the yoke body to achieve magnetic path isolation on both sides of the back - to - back stator structure.

[0114] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An axial flux stator assembly, characterized in that, The axial flux stator assembly includes: a base (1), multiple stator yokes (2), multiple stator teeth (3), and multiple stator windings (4), wherein each of the stator yokes (2) and each of the stator teeth (3) is made of multiple silicon steel sheets stacked together; The base (1) has a cylindrical structure; The plurality of stator yokes (2) are located inside the base (1) and are evenly distributed along the circumferential direction of the inner wall of the base (1), and are respectively connected to the inner wall of the base (1). The plurality of stator yokes (2) are not connected to each other. The stator teeth (3) have a strip structure. The plurality of stator teeth (3) are located between two adjacent stator yokes (2), and the middle part of each stator tooth (3) is connected to the stator yokes (2) on both sides in the first direction. The first direction is the extension direction of the axis of the base (1). The plurality of stator windings (4) are respectively wound around the portions of each stator tooth (3) near the two ends in the first direction; The stator tooth (3) includes a stator tooth root (31), a first tooth body (32), a second tooth body (33), and a tooth-part magnetic shielding block (36). The first tooth body (32) and the second tooth body (33) are located at the first side (31A) and the second side (31B) of the stator tooth root (31) respectively in the first direction, and are connected to the first side (31A) and the second side (31B) respectively. The fifth side (31I) of the stator tooth root (31) has a through hole (31J). The through hole (31J) is located in the middle of the fifth side (31I). The tooth-part magnetic shielding block (36) is located in the through hole (31J) and is connected to the inner wall of the through hole (31J). The plurality of stator windings (4) are respectively wound on the first tooth body (32) and the second tooth body (33).

2. The axial flux stator assembly according to claim 1, characterized in that, The inner surface of the base (1) has a plurality of strip-shaped limiting protrusions (11), which are evenly distributed along the circumferential direction of the inner wall of the base (1), and the length direction of the strip-shaped limiting protrusions (11) is parallel to the axis of the base (1). The stator yoke (2) has a limiting groove (2A) on the surface of the inner wall of the base (1), and each stator yoke (2) is engaged with a strip-shaped limiting protrusion (11) through the limiting groove (2A).

3. The axial flux stator assembly according to claim 2, characterized in that, The inner surface of the base (1) has an annular limiting protrusion (12), which is connected to each strip limiting protrusion (11). The side of the annular limiting protrusion (12) near the strip limiting protrusion (11) is in contact with the stator yoke (2).

4. The axial flux stator assembly according to claim 1, characterized in that, Each surface of the stator yoke (2) connected to the stator teeth (3) has a first protrusion (2B) and a second protrusion (2C), the first protrusion (2B) being close to the axis of the base (1), the second protrusion (2C) being away from the axis of the base (1), and the distance (D1) between the first protrusion (2B) and the second protrusion (2C) in the radial direction of the base (1) being equal to the height (H1) of the stator teeth (3) in the radial direction of the base (1).

5. The axial flux stator assembly according to any one of claims 1-4, characterized in that, The stator yoke (2) includes a first stator yoke (21), a yoke magnetic isolation block (22), and a second stator yoke (23). The first stator yoke (21), the yoke magnetic isolation block (22), and the second stator yoke (23) are arranged in a block structure in sequence.

6. The axial flux stator assembly according to claim 1, characterized in that, The stator teeth (3) also include a first pole shoe (34) and a second pole shoe (35); The first pole shoe (34) is located at the end of the first tooth body (32) away from the stator tooth root (31) and is connected to the first tooth body (32); The second pole shoe (35) is located at the end of the second tooth body (33) away from the stator tooth root (31) and is connected to the second tooth body (33).

7. The axial flux stator assembly according to claim 6, characterized in that, The third side (31C) and the fourth side (31D) opposite to the stator tooth root (31) are respectively used to connect with two adjacent stator yokes (2), and the stator winding (4) is wound on the first tooth body (32) and the second tooth body (33).

8. The axial flux stator assembly according to claim 7, characterized in that, In a direction perpendicular to the third side (31C), the distance (D2) between the third side (31C) and the fourth side (31D) is greater than the width (W1) of the first tooth (32) and greater than the width (W2) of the second tooth (33).

9. The axial flux stator assembly according to claim 7, characterized in that, The third side surface (31C) has a third protrusion (31E) and a fourth protrusion (31F), the third protrusion (31E) and the fourth protrusion (31F) are distributed along the axial direction of the base (1), and the distance (D3) between the third protrusion (31E) and the fourth protrusion (31F) in the axial direction of the base (1) is equal to the thickness (T1) of the stator yoke (2) in the axial direction of the base (1).

10. The axial flux stator assembly according to claim 7, characterized in that, The fourth side surface (31D) has a fifth protrusion (31G) and a sixth protrusion (31H), which are distributed along the axial direction of the base (1), and the distance (D4) between the fifth protrusion (31G) and the sixth protrusion (31H) in the axial direction of the base (1) is equal to the thickness (T1) of the stator yoke (2) in the axial direction of the base (1).

11. An electric motor, characterized in that, The motor includes an axial flux stator assembly (01) as described in any one of claims 1-10.

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