Axial flux motor

Abstract

The utility model relates to an axial magnetic flux motor. The axial magnetic flux motor comprises a stator, the stator comprises a plurality of single-tooth units distributed around a central axis in the circumferential direction, each single-tooth unit comprises a single tooth and a coil, and the single tooth of each single-tooth unit has a longitudinal axis parallel to the central axis. The coil of each single-tooth unit is formed by a flat wire wound on the corresponding single tooth around the corresponding longitudinal axis, the size of the coil of each single-tooth unit in the width direction is larger than the size of the coil in the thickness direction, and the coil of each single-tooth unit is wound on the corresponding single tooth in an inclined mode. The respective coil has an inclination angle with respect to the respective longitudinal axis in the width direction that is greater than 0 degree and less than 90 degrees. The axial magnetic flux motor provided by the utility model has an improved winding mode.

Description

Technical Field

[0001] This utility model relates to the field of motor technology. Specifically, this utility model relates to an axial flux motor. Background Technology

[0002] Axial flux motors are motors with the stator and rotor distributed along the axial direction, offering advantages such as high torque density, small axial dimensions, and high efficiency. The stator of an axial flux motor typically comprises multiple circumferentially distributed and connected single-tooth units, each consisting of a single tooth and a coil wound around it. To improve space utilization and energy density, flat wire is usually used to form the coil, with the width direction of the flat wire perpendicular to the axial direction of the stator. However, because single teeth typically have a fan-shaped or fan-annular cross-section while flat wire has a rectangular cross-section, when the flat wire is wound around a single tooth, it tends to exhibit a high stretch ratio and a low compression ratio when passing through the corner region of the tooth. Due to the limited elastic deformation capacity of the cladding layer on the surface of the flat wire, this arrangement easily damages the cladding layer in the corner region of the flat wire, leading to problems such as short circuits or exposed coils. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to provide an axial flux motor with an improved winding method.

[0004] The aforementioned technical problem is solved by an axial flux motor according to this utility model. The axial flux motor includes a stator comprising a plurality of single-tooth units circumferentially distributed around a central axis. Each single-tooth unit includes a single tooth and a coil. The single tooth of each single-tooth unit has a longitudinal axis parallel to the central axis. The coil of each single-tooth unit is formed by a flat wire wound around the corresponding single tooth around the corresponding longitudinal axis. The coil of each single-tooth unit has a greater dimension in the width direction than in the thickness direction. The coil of each single-tooth unit is wound obliquely on the corresponding single tooth, such that the corresponding coil has an oblique angle relative to the corresponding longitudinal axis of greater than 0 degrees and less than 90 degrees in the width direction. By obliquely winding the flat wire, the stretching ratio and compression ratio of the coil during bending can be effectively reduced, thereby reducing the risk of damage to the coil coating.

[0005] According to a preferred embodiment of the present invention, the coil of each single-tooth unit can be wound on the corresponding single tooth at a constant tilt angle. This facilitates the formation of a regular winding structure.

[0006] According to another preferred embodiment of the present invention, the coils of the plurality of single-tooth units can have the same tilt angle as each other. This facilitates the design and manufacture of the stator.

[0007] According to another preferred embodiment of the present invention, the tilt angle of the coil in each single-tooth unit can be 45 degrees. This tilt angle can reduce the stretching and compression ratio of the coil when bending without excessively increasing the axial winding space requirement.

[0008] According to another preferred embodiment of the present invention, the stator may further include an annular connecting ring, and the plurality of single-tooth units can be respectively fixedly connected to the connecting ring. These single-tooth units are connected by the connecting ring to form a complete stator.

[0009] According to another preferred embodiment of the present invention, each single tooth may include a core unit and a winding tube. The core unit of each single tooth is fixedly mounted on the radially inner side of the corresponding winding tube. Each winding tube may include a limiting groove extending spirally around its outer peripheral surface. The coil of each single tooth unit can be wound along the corresponding limiting groove onto the outer peripheral surface of the corresponding winding tube. The winding tube can isolate the coil from the core and facilitates the restriction of the coil arrangement by means of the limiting groove.

[0010] According to another preferred embodiment of the present invention, the limiting groove of each winding tube can limit the tilt angle of the corresponding coil by matching its shape. Thus, the tilting arrangement of the coil can be conveniently achieved through the limiting groove.

[0011] According to another preferred embodiment of the present invention, the two sidewalls of the limiting groove of each winding tube may intersect at the bottom of the groove, such that the limiting groove of each winding tube forms a triangular profile in a cross-section passing through the corresponding longitudinal axis. The coil of each single-tooth unit may include two side surfaces extending in the width direction and opposite in the thickness direction, and two edge surfaces extending in the thickness direction and opposite in the width direction. One sidewall of the limiting groove of each winding tube may abut against one side surface of the corresponding coil, and the other sidewall abuts against one edge surface of the corresponding coil. This simplifies the structure of the limiting groove.

[0012] According to another preferred embodiment of the present invention, in the coil of each single-tooth unit, coil segments in adjacent turns can abut against each other through their respective side surfaces. This allows adjacent turns of the coil to be pressed together, thereby facilitating coil confinement and increasing energy density.

[0013] According to another preferred embodiment of the present invention, each single tooth may have a fan-shaped or fan-ring profile in a cross-section perpendicular to the corresponding longitudinal axis. This single tooth profile has significant corner regions, and the inclined coil arrangement can significantly reduce the stretch and compression ratios in these corner regions. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings. In the drawings, the same reference numerals represent elements with the same function. Wherein:

[0015] Figure 1 A perspective view of the stator of an axial flux motor according to an exemplary embodiment of the present invention is shown.

[0016] Figure 2a and Figure 2b Show respectively Figure 1 The perspective view and sectional view of a single tooth unit of the stator shown;

[0017] Figures 3a to 3c The figures show perspective views of a single tooth, a winding tube, and a core unit of the single-tooth unit shown in Figure 2; and

[0018] Figure 4a and Figure 4b A comparative schematic diagram showing the deformation rate of a coil according to the prior art and a coil according to an exemplary embodiment of the present invention is shown respectively. Detailed Implementation

[0019] The following describes specific embodiments of the axial flux motor according to the present invention with reference to the accompanying drawings. The detailed description and drawings below are provided to exemplify the principles of the present invention. The present invention is not limited to the described preferred embodiments, and the scope of protection of the present invention is defined by the claims.

[0020] According to an embodiment of the present invention, an axial flux motor is provided. This axial flux motor is used as a torque-generating drive mechanism, for example, for driving pump assemblies in pump applications. Exemplary embodiments of the axial flux motor according to the present invention will now be explained with reference to the accompanying drawings.

[0021] An axial flux motor according to an exemplary embodiment of the present invention may include a stator 100 and a rotor. Since the technical solution of the present invention only relates to improvements to the stator 100, only the structure of the stator 100 is shown in the various figures. Figure 1 A perspective view of the stator 100 of an axial flux motor according to an exemplary embodiment of the present invention is shown. Figure 1 As shown, the stator 100 is integrally formed into a generally hollow cylindrical structure. The rotor (not shown) is rotatably arranged radially inward of the stator 100 about a common central axis. The stator 100 includes a plurality of single-tooth units 10 and an annular connecting ring 20. Each single-tooth unit 10 has a substantially identical structure. These single-tooth units 10 are distributed circumferentially, and particularly uniformly, around the central axis of the stator 100. The annular connecting ring 20 is coaxially arranged around the central axis of the stator 100. These single-tooth units 10 are respectively fixedly connected to the connecting ring 20, thereby forming the complete stator 100.

[0022] Figure 2a and Figure 2b They are shown respectively Figure 1The stator 100 is shown in a perspective view and a cross-sectional view of a single tooth unit 10. (See attached image.) Figure 2a As shown, each single-tooth unit 10 includes a single tooth and a coil 13 wound around that single tooth. Figure 3a As shown, each single tooth unit 10 has a generally columnar structure, with its longitudinal axis arranged substantially parallel to the central axis of the stator 100. Specifically, each single tooth includes a columnar core unit 11 and a cylindrical winding tube 12. The core unit 11 is formed as follows... Figure 3c The solid cylinder shown, and the winding tube 12 is formed as follows Figure 3b The hollow cylinder is shown. The cross-sectional shape of the core unit 11 perpendicular to the longitudinal direction roughly corresponds to the cross-sectional shape of the inner cavity of the winding tube 12 perpendicular to the longitudinal direction. Each single-tooth core unit 11 is fixedly mounted on the radially inner side of the corresponding winding tube 12. For example, each single-tooth core unit 11 and winding tube 12 may have a roughly fan-shaped or fan-annular profile in a cross-section perpendicular to the longitudinal axis, so that the entire single tooth also has a roughly fan-shaped or fan-annular profile in a cross-section perpendicular to the longitudinal axis. Each single tooth can be connected to the connecting ring 20 through its respective winding tube 12.

[0023] The coil 13 of each single-tooth unit 10 is wound around the longitudinal axis of the corresponding single tooth, specifically around the outer peripheral surface of the corresponding winding tube 12. For example... Figure 2b As shown, the coil 13 of each single-tooth unit 10 is formed as a flat wire. Specifically, the coil 13 has a substantially uniform cross-sectional shape along its own extension direction, and when viewed in a cross-section perpendicular to the extension direction of the coil 13, the coil 13 has a generally rectangular outline, such that its dimension in the width direction is greater than its dimension in the thickness direction. The two surfaces of each coil 13 with larger dimensions in this cross-section can be referred to as side surfaces 13a, and the two surfaces of each coil 13 with smaller dimensions in this cross-section can be referred to as edge surfaces 13b. The two side surfaces 13a extend in the width direction and are opposite each other in the thickness direction, while the two edge surfaces 13b extend in the thickness direction and are opposite each other in the width direction. The width direction and the extension direction together define the flat surface orientation of the coil 13 as a flat wire.

[0024] like Figure 2bAs shown, unlike existing technologies, the width direction of the coil 13 of each single-tooth unit 10 is not perpendicular to the longitudinal axis of the single-tooth unit 10, but is wound obliquely around the corresponding single tooth. That is, the flat surface direction of the coil 13 of each single-tooth unit 10 is oblique relative to the corresponding longitudinal axis, thus forming an angle greater than 0 degrees and less than 90 degrees between the width direction of the coil 13 and the corresponding longitudinal axis. This angle is called the tilt angle α of the coil 13. When wound around the longitudinal axis, the obliquely arranged flat wire has a smaller stretch ratio and compression ratio in the bending region, thereby reducing the tension and compression forces on the coil 13, especially its covering layer. Specific example parameters will be given below.

[0025] Preferably, ideally, the coil 13 of each single-tooth unit 10 can be wound around the corresponding single tooth at a constant tilt angle α. For ease of design and manufacturing, the coils 13 of multiple single-tooth units 10 in the same stator 100 can also have the same tilt angle α. Due to practical limitations, especially in the coil turns at both axial ends, the tilt angle α of some sections of the coil 13 may slightly deviate from the predetermined tilt angle α, as long as this deviation is within a controllable range. The smaller the tilt angle α, the closer the flat surface direction of the flat wire is to the longitudinal axis, and the closer the flat wire is to a vertical arrangement, resulting in a better effect on reducing the stretch ratio and compression ratio, but also a larger longitudinal space required to arrange the coil 13; the larger the tilt angle α, the further the flat surface direction of the flat wire deviates from the longitudinal axis, and the closer the flat wire is to a horizontal arrangement, resulting in a worse effect on reducing the stretch ratio and compression ratio, but also a smaller longitudinal space required to arrange the coil 13. Therefore, a balance needs to be struck between reducing the stretch ratio and compression ratio and reducing the wiring space. For example, the tilt angle α of the coil 13 of each single-tooth unit 10 can be set to 45 degrees. Depending on the specific needs, other angles can also be selected.

[0026] like Figure 3a and Figure 3b As shown, to limit the tilt angle of the coil 13, each winding tube 12 may form a limiting groove 12a. The limiting groove 12a extends continuously spirally around the outer peripheral surface of the winding tube 12. The coil 13 of each single-tooth unit 10 is wound onto the outer peripheral surface of the corresponding winding tube 12 along the corresponding limiting groove 12a. The limiting groove 12a can limit both the extension direction of the coil 13 and the tilt angle of the coil 13.

[0027] The limiting groove 12a restricts the tilt angle α of the coil 13 through the shape fit between the two in cross-section. That is, the limiting groove 12a limits the tilt angle of the coil 13 through its inclined surface. For example, as Figure 2bAs shown, when viewed in a cross-section passing through the longitudinal axis of the single tooth, the two sidewalls of the limiting groove 12a can extend at opposite angles relative to the transverse direction (i.e., the direction perpendicular to the longitudinal axis), such that the two sidewalls intersect at the bottom of the limiting groove 12a. Therefore, the limiting groove 12a forms a triangular profile in this cross-section. One sidewall of the limiting groove 12a abuts against a side surface 13a of the coil 13, while the other sidewall abuts against an edge surface 13b of the coil 13. This allows the flat surface direction of the coil 13 to be defined as inclined relative to the longitudinal axis.

[0028] More preferably, in order to obtain a higher energy density, in the coil 13 of each single-tooth unit 10, the coil segments in adjacent turns abut against each other through their respective side surfaces 13a, so that the individual turns of the coil 13 are pressed together. Figure 2b As shown, in order to achieve this clamping arrangement of coil 13, the triangular profiles of each turn of the limiting groove 12a can be arranged adjacent to each other along the longitudinal axis to form a sawtooth profile.

[0029] Figure 4a and Figure 4b A schematic diagram comparing the deformation rates in the corner region of a coil arranged without tilt according to the prior art and a coil arranged with tilt according to the present invention is shown. Figure 4a The case of the stretch ratio is shown, while Figure 4b The compression ratio is shown. Due to the inclined arrangement of the coils according to this invention, one side surface 13a of the coil 13 is closer to the longitudinal axis than the other side surface 13. Therefore, the side surface closer to the longitudinal axis can be referred to as the inner side surface, and the other side surface as the outer side surface.

[0030] Reference corresponds to Figure 4a As shown in Table 1 (where L, L0, and l represent the arc lengths of the outer, middle, and inner regions, respectively), the elongation ratio due to tensile deformation in a flat wire coil without tilting can reach as high as 474.19%. In contrast, the highest elongation ratio of a flat wire coil with a 45-degree tilt is only 214.41%, which is 54.78% lower than that of a flat wire coil without tilting.

[0031] Table 1

[0032]

[0033] Similarly, the reference corresponds to Figure 4b As shown in Table 2, the compression ratio of flat wire coils without tilting is as low as 34.83% due to compression deformation. In contrast, the lowest compression ratio of flat wire coils with a 45-degree tilt is 63.61%, which is 82.63% higher than that of flat wire coils without tilting.

[0034] Table 2

[0035]

[0036] It is evident that the sheath of a flat wire coil without tilting is more susceptible to damage due to deformation, while a flat wire coil with tilting can effectively reduce the deformation rate of the coil in the corner area, thereby reducing the risk of damage to the coil sheath due to deformation.

[0037] While possible embodiments have been described exemplarily in the foregoing description, it should be understood that numerous variations of the embodiments exist through combinations of all known and readily conceived technical features and implementation methods. Furthermore, it should be understood that the exemplary embodiments are merely examples and do not in any way limit the scope, application, or construction of this invention. The foregoing description is more intended to provide those skilled in the art with technical guidance for transforming at least one exemplary embodiment, wherein various changes, particularly regarding the function and structure of the components, can be made without departing from the scope of the claims.

[0038] Appendix Label Table

[0039] 100 stators

[0040] 10 Single-tooth unit

[0041] 11 Iron core units

[0042] 12 winding tubes

[0043] 12a Limiting groove

[0044] 13 coils

[0045] 13a Side surface

[0046] 13b Edge Surface

[0047] 20 connecting rings

[0048] α Inclination angle

Claims

1. An axial flux motor, comprising a stator (100), the stator (100) comprising a plurality of single-tooth units (10) circumferentially distributed around a central axis, each single-tooth unit (10) comprising a single tooth and a coil (13), the single tooth of each single-tooth unit (10) having a longitudinal axis parallel to the central axis, the coil (13) of each single-tooth unit (10) being formed by a flat wire wound around a corresponding single tooth around a corresponding longitudinal axis, the coil (13) of each single-tooth unit (10) having a dimension in the width direction greater than its dimension in the thickness direction, characterized in that, The coil (13) of each single-tooth unit (10) is wound on the corresponding single tooth in an oblique manner, such that the corresponding coil (13) has an oblique angle (α) relative to the corresponding longitudinal axis of greater than 0 degrees and less than 90 degrees in the width direction.

2. The axial flux motor according to claim 1, characterized in that, The coil (13) of each single-tooth unit (10) is wound on the corresponding single tooth at a constant tilt angle (α).

3. The axial flux motor according to claim 2, characterized in that, The coils (13) of the plurality of single-tooth units (10) have the same tilt angle (α) as each other.

4. The axial flux motor according to claim 3, characterized in that, The tilt angle (α) of the coil (13) of each single-tooth unit (10) is 45 degrees.

5. The axial flux motor according to claim 1, characterized in that, The stator (100) also includes an annular connecting ring (20), and the plurality of single-tooth units (10) are respectively fixedly connected to the connecting ring (20).

6. The axial flux motor according to claim 1, characterized in that, Each tooth includes a core unit (11) and a winding tube (12). The core unit (11) of each tooth is fixedly mounted on the radially inner side of the corresponding winding tube (12). Each winding tube (12) includes a limiting groove (12a) extending spirally around the outer peripheral surface. The coil (13) of each tooth unit (10) is wound along the corresponding limiting groove (12a) onto the outer peripheral surface of the corresponding winding tube (12).

7. The axial flux motor according to claim 6, characterized in that, The limiting groove (12a) of each winding tube (12) limits the tilt angle (α) of the corresponding coil (13) by shape matching.

8. The axial flux motor according to claim 7, characterized in that, The two sidewalls of the limiting groove (12a) of each winding tube (12) intersect at the bottom of the groove, such that the limiting groove (12a) of each winding tube (12) forms a triangular profile in a cross section passing through the corresponding longitudinal axis. The coil (13) of each single tooth unit (10) includes two side surfaces (13a) extending in the width direction and opposite in the thickness direction, and two edge surfaces (13b) extending in the thickness direction and opposite in the width direction. One sidewall of the limiting groove (12a) of each winding tube (12) abuts against one side surface (13a) of the corresponding coil (13), and the other sidewall abuts against one edge surface (13b) of the corresponding coil (13).

9. The axial flux motor according to claim 8, characterized in that, In the coil (13) of each single-tooth unit (10), the coil segments in adjacent turns abut against each other through their respective side surfaces (13a).

10. The axial flux motor according to any one of claims 1 to 9, characterized in that, Each tooth has a fan-shaped or fan-shaped profile in a section perpendicular to the corresponding longitudinal axis.

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