An axial flux motor stator and its motor

Abstract

An embodiment of the present invention relates to an axial flux motor stator and its motor, which includes a plurality of stator cores, a plurality of stator windings, a stator outer ring, and a stator inner ring; the stator windings are wound around the stator cores; the stator outer ring is formed by sequentially connecting a plurality of side wall blocks with an arc-shaped structure as the main body, and fixing parts are arranged on the inner walls of the side wall blocks; the stator inner ring includes an upper fixing plate, a lower fixing plate, and an inner ring connecting part. The upper fixing plate and the lower fixing plate are respectively fixedly arranged at both ends of the inner ring connecting part. The fixing parts on the stator outer ring press against the stator cores from the outside of the stator cores, and the upper fixing plate and the lower fixing plate of the stator inner ring press against the stator cores from the inside of the stator cores, thereby fixing the stator cores. The stator has high fastening strength, low requirements for the machining accuracy of parts, convenient assembly, and good heat dissipation effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of axial flux motors, and particularly relates to an axial flux motor stator and a motor thereof. Background Art

[0002] In the prior art, the assembly of an axial flux motor stator usually uses a hollow disk with an integral structure as the outer ring. The stator is in interference fit with the hollow disk. During assembly, it is necessary to heat the outer ring of the hollow disk to make it expand due to heat, and cool the inner ring to make it contract due to cold. Then, the stator is inserted into the hollow disk. This assembly method is difficult to install, the process is cumbersome and complex, and has high requirements for the machining accuracy of parts. Therefore, the process cost is very high, and there is also a risk of scalding the copper wire enamel coating of the winding by the preheated hollow disk; there is also an assembly method that uses an adhesive method to bond the stator to the hollow disk, and its disadvantage is insufficient strength. Summary of the Invention

[0003] In order to solve at least one of the above technical problems, an embodiment of the present invention provides an axial flux motor stator and a motor thereof.

[0004] According to a first aspect of the present invention, an embodiment of the present invention provides an axial flux motor stator.

[0005] An axial flux motor stator includes a plurality of stator cores, a plurality of stator windings, a stator outer ring, and a stator inner ring; the stator windings are wound around the stator cores; the stator outer ring is formed by sequentially connecting a plurality of side wall blocks with an arc-shaped structure, and fixing portions are provided on the inner walls of the side wall blocks; the stator inner ring includes an upper fixing disk, a lower fixing disk, and an inner ring connecting portion. The upper fixing disk and the lower fixing disk are respectively fixedly provided at both ends of the inner ring connecting portion. The fixing portions on the stator outer ring press against the stator cores from the outside of the stator cores, and the upper fixing disk and the lower fixing disk of the stator inner ring press against the stator cores from the inside of the stator cores, thereby fixing the stator cores.

[0006] Further, the height of the stator core is greater than the height of the stator winding. The upper end and the lower end of the stator core both protrude beyond the stator winding, respectively forming an upper protruding end and a lower protruding end of the stator core.

[0007] Further, the fixing portion includes an upper protruding portion and a lower protruding portion extending in the radial direction of the stator from the inner wall of the arc-shaped side wall block. The upper protruding portion of the fixing portion presses against the outside of the upper protruding end of the stator core, and the lower protruding portion of the fixing portion presses against the outside of the lower protruding end of the stator core.

[0008] Further, the side wall block is a heat-conducting side wall block, and heat-conducting protruding blocks protruding in the radial direction of the stator are further provided between adjacent fixing portions. The heat-conducting protruding blocks are attached to the stator windings.

[0009] Furthermore, the heat-conducting bumps are ridge-shaped, and at least part of the ridges of the heat-conducting bumps extend into the space between adjacent stator cores; and / or,

[0010] The inner wall of the side wall block is attached to the stator winding.

[0011] Furthermore, the inner stator ring includes an annular upper fixing plate, an annular lower fixing plate, and an inner ring connecting portion. The upper fixing plate and the lower fixing plate are respectively fixedly arranged at both ends of the inner ring connecting portion. The inner ring connecting portion is a hollow connecting cylinder. The outer side wall of the upper fixing plate abuts against the inner side of the upper protruding end of the stator core, and the outer side wall of the lower fixing plate abuts against the inner side of the lower protruding end of the stator core.

[0012] Furthermore, the outer contours of the upper fixing plate and the lower fixing plate are both regular polygons. Each side of the upper fixing plate abuts against the inner side of the upper protruding end of the stator core, and each side of the lower fixing plate abuts against the inner side of the lower protruding end of the stator core.

[0013] Furthermore, a gap with a certain width is reserved between adjacent side wall blocks; and / or,

[0014] The stator winding is also adhesively fixed to the side wall block through heat-conducting glue.

[0015] Furthermore, a gap is provided between the stator winding and the inner ring connecting portion; and / or,

[0016] Heat-dissipating fins are also provided on the outer side wall of the side wall block.

[0017] According to the second aspect of the present invention, an axial-flux motor is proposed in an embodiment of the present invention.

[0018] An axial-flux motor includes one of the axial-flux motor stators as described above.

[0019] Advantages of the present invention: The axial-flux motor stator proposed in the embodiment of the present invention adopts a split outer ring, which is composed of a plurality of arc-shaped side wall blocks connected to each other. The stator is fixed by pressing the side wall blocks and the inner ring against the stator core. The fastening effect is good, the fastening strength is high, the processing accuracy requirements for parts are low, the assembly is convenient, the fastening force is controllable, no heating is required, and there is no risk of scalding the enameled wire of the winding. Moreover, the stator winding abuts against and fits the arc-shaped side wall block, and the heat dissipation effect is good. Description of the Drawings

[0020] Figure 1 is an exploded view of the axial-flux motor stator proposed in the embodiment of the present invention;

[0021] Figure 2 is a partial exploded view of the axial-flux motor stator proposed in the embodiment of the present invention;

[0022] Figure 3 is a schematic cross-sectional view of the stator of an axial-flux motor proposed by an embodiment of the present invention;

[0023] Figure 4 is a schematic radial cross-sectional view of the stator of an axial-flux motor proposed by an embodiment of the present invention;

[0024] Figure 5 is a schematic axial cross-sectional view of the stator of an axial-flux motor proposed by an embodiment of the present invention. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. However, those skilled in the art should understand that the present invention is not limited to the drawings in the specification and the following embodiments.

[0026] As described herein, the term "including" and its various variants can be understood as open-ended terms, meaning "including but not limited to". The terms "upper", "lower", "inner", "outer" and their similar expressions are only used to represent the positional relationship between relative objects. The terms "first", "second" and their similar expressions are only used to represent different technical features and have no substantial meaning.

[0027] The present invention proposes an axial-flux motor stator, which includes a plurality of stator cores 10, a plurality of stator windings 20, a stator outer ring 30, and a stator inner ring 40; the stator windings 20 are wound around the stator cores 10; the stator outer ring 30 is formed by sequentially connecting a plurality of side wall blocks 31 with an arc-shaped structure, and fixing parts are provided on the inner walls of the side wall blocks 31; the stator inner ring 40 includes an upper fixing plate 41, a lower fixing plate 42, and an inner ring connecting part 43. The upper fixing plate 41 and the lower fixing plate 42 are respectively fixedly arranged at both ends of the inner ring connecting part 43. The fixing parts on the stator outer ring 30 press the stator cores 10 from the outside of the stator cores, and the upper fixing plate 41 and the lower fixing plate of the stator inner ring 40 press the stator cores 10 from the inside of the stator cores 10, thereby fixing the stator cores 10.

[0028] Specifically, referring to Figures 1-5 , the axial-flux motor stator of the embodiment of the present invention includes a plurality of stator cores 10, a plurality of stator windings 20, a stator outer ring 30, and a stator outer ring 40.

[0029] The stator winding 20 is wound on the stator core 10. The stator core 10, for example, has a main body whose axial interface is roughly I-shaped, and the stator winding 20 is wound in the middle of the I-shaped stator core. The height of the stator core 10 is greater than the height of the stator winding 20, and the upper end and the lower end of the stator core 10 both protrude outside the stator winding 20, respectively constituting the upper protruding end 11 and the lower protruding end 12 of the stator core. The number of the stator core 10 and the stator winding 20 can be determined according to actual needs. For example, the stator of the embodiment of the present invention has 12 stator cores 10. Obviously, those skilled in the art can understand that the present invention is not limited to 12 stator cores.

[0030] The stator outer ring 30 is a split structure, and is formed into a circular stator outer ring by connecting a plurality of side wall blocks 31 with arc-shaped structures in sequence. For example, the stator outer ring 30 is formed into a hollow circular ring shape by connecting 2, 3 or 4 arc-shaped side wall blocks 31 in sequence. A certain width of gap is reserved between adjacent side wall blocks 31, so that when multiple side wall blocks 31 are connected and locked, the tightening effect can be improved. In one embodiment, both ends of each side wall block 31 in the circumferential direction are axially provided with side wall block connecting parts 32 extending toward the outside of the side wall block 31, and screw holes are provided on the connecting parts. When connecting, the side wall block connecting parts 32 on the adjacent side wall blocks 31 are locked with screws 33, so that multiple side wall blocks 31 can be easily connected. A plurality of fixing parts are arranged on the inner wall of the arc-shaped side wall block 31, and the fixing parts correspond to the stator core 10 and are used to press the stator core 10. The fixing parts include an upper protrusion 341 and a lower protrusion 342 extending from the inner wall of the arc-shaped side wall block 31 toward the radial direction of the stator. The upper protrusion 341 of the fixing part is opposite to the outer side of the upper protruding end 11 of the stator core 10, and the upper protrusion 341 of the fixing part presses on the outer side of the upper protruding end 11 of the stator core 10, and the lower protrusion 342 of the fixing part is opposite to the outer side of the lower protruding end 12 of the stator core 10, and the lower protrusion 342 of the fixing part presses on the outer side of the lower protruding end 12 of the stator core 10. Preferably, the number of the fixing parts is the same as the number of the stator core 10, and the two correspond one to one. Preferably, a plurality of heat dissipation fins 35 are also arranged on the outer side wall of the side wall block 31 to increase the heat dissipation area and improve the heat dissipation effect. Preferably, a heat-conducting protrusion 36 protruding in the radial direction of the stator is further provided between adjacent fixing portions, and the heat-conducting protrusion 36 is provided in close contact with the stator winding 20. More preferably, the heat-conducting protrusion 36 is ridge-shaped, and the ridge of the heat-conducting protrusion 36 at least partially extends into between adjacent stator cores (such as Figure 3 As shown). More preferably, the inner wall of the side wall block 31 is arranged in contact with the stator winding 20. The side wall block 31 is a heat-conducting side wall block made of a heat-conducting material, such as an aluminum alloy side wall block made of an aluminum alloy, and the ridge-shaped heat-conducting protrusion 36 has a better heat dissipation effect.

[0031] The stator inner ring 40 includes an annular upper fixing plate 41, an annular lower fixing plate 42 and an inner ring connecting portion 43. The upper fixing plate 41 and the lower fixing plate 42 are respectively fixedly arranged at both ends of the inner ring connecting portion 43. The inner ring connecting portion 43 is, for example, a hollow connecting cylinder. The outer side wall of the upper fixing plate 41 abuts against the inner side of the upper protruding end 11 of the stator core 10, and the outer side wall of the lower fixing plate 42 abuts against the inner side of the lower protruding end 12 of the stator core 10. In one embodiment, the outer contours of the upper fixing plate 41 and the lower fixing plate 42 are both regular polygons. Each side of the upper fixing plate 41 faces the inner side of the upper protruding end 11 of the stator core 10 and abuts against the inner side of the upper protruding end 11. Each side of the lower fixing plate 42 faces the inner side of the lower protruding end 12 of the stator core 10 and abuts against the inner side of the lower protruding end 12. Thus, each side of the upper fixing plate 41 corresponds to the inner side of the upper protruding end 11 of the stator core 10 one by one, and each side of the lower fixing plate 42 corresponds to the inner side of the lower protruding end 12 of the stator core 10 one by one. For example, both the upper fixing plate 41 and the lower fixing plate 42 are annular dodecagonal plates. Preferably, a gap d (as shown in Figure 4 ) is provided between the stator winding 20 and the inner ring connecting portion 43. By providing this gap d, heat transfer between the stator winding 20 and the stator inner ring 40 is avoided, heat transfer from the stator winding 20 to the stator inner ring 40 can be reduced, thereby preventing the bearings (see the following components) for installing the rotating shaft 50 from overheating.

[0032] Preferably, the stator further includes a rotating shaft 50. The stator inner ring 40 forms a bearing seat. For example, bearing seats are provided at both ends of the stator inner ring 40, and bearings are arranged in the bearing seats. The rotating shaft 50 passes through the hollow inner ring connecting portion 43 of the stator inner ring 40 and is installed on the bearings for connecting external components.

[0033] Preferably, the stator winding 20 is also adhesively fixed to the side wall block 31 with heat-conducting glue. This not only enhances the strength of the stator but also improves the heat dissipation effect of the stator.

[0034] When the stator of the embodiment of the present invention is installed, the upper protruding part 341 and the lower protruding part 342 of the fixing part on the side wall block 31 of the stator outer ring 30 respectively press against the outer sides of the upper protruding end 11 and the lower protruding end 12 of the stator core 10 from the outside of the stator core 10. The upper fixing disk 41 and the lower fixing disk 42 of the stator inner ring 40 respectively press against the inner sides of the upper protruding end 11 and the lower protruding end 12 of the stator core 10. Through the side wall block connecting part 32 of the adjacent side wall blocks 31, a plurality of side wall blocks 31 are locked and connected by screws. Since a certain width of gap is reserved between the adjacent side wall blocks 31, the side wall blocks 31 can be fully locked to form a tightened stator outer ring 30, with good tightening effect, high stator strength, preventing the stator from moving during operation, being able to withstand greater magnetic pulling force and other tangential external forces, and the structure being more firm; the stator assembly is simple, with low requirements for the machining accuracy of parts, which can greatly reduce the cost of the stator; the stator winding 20 fits against the inner wall of the heat-conducting side wall block 31 and the ridge-shaped protrusion 36, heat-dissipating fins are arranged on the outer side wall of the side wall block 31, and the side wall block 31 and the stator winding 20 are adhesively fixed by heat-conducting glue, all of which can effectively improve the heat dissipation effect of the stator.

[0035] The embodiment of the present invention also proposes an axial-flux motor, and the axial-flux motor includes one of the above-mentioned axial-flux motor stators.

[0036] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0037] The above has described the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An axial flux motor stator, characterized in that, It includes a plurality of stator cores, a plurality of stator windings, a stator outer ring and a stator inner ring; the stator windings are wound around the stator cores; the stator outer ring is formed by sequentially connecting a plurality of side wall blocks with an arc-shaped structure as the main body, and fixing parts are arranged on the inner walls of the side wall blocks; the stator inner ring includes an upper fixing plate, a lower fixing plate and an inner ring connecting part, the upper fixing plate and the lower fixing plate are respectively fixedly arranged at both ends of the inner ring connecting part, the fixing parts on the stator outer ring press against the stator core from the outside of the stator core, and the upper fixing plate and the lower fixing plate of the stator inner ring press against the stator core from the inside of the stator core, so as to fix the stator core.

2. The axial flux motor stator according to claim 1, characterized in that, The height of the stator core is greater than the height of the stator winding, and both the upper end and the lower end of the stator core protrude beyond the stator winding, respectively forming the upper protruding end and the lower protruding end of the stator core.

3. The axial flux motor stator according to claim 2, characterized in that, The fixing part includes an upper protruding part and a lower protruding part extending from the inner wall of the arc-shaped side wall block towards the radial direction of the stator. The upper protruding part of the fixing part presses against the outside of the upper protruding end of the stator core, and the lower protruding part of the fixing part presses against the outside of the lower protruding end of the stator core.

4. The axial-flux motor stator according to claim 3, wherein, The side wall block is a heat-conducting side wall block, and heat-conducting protruding blocks protruding towards the radial direction of the stator are further arranged between adjacent fixing parts, and the heat-conducting protruding blocks are attached to the stator winding.

5. The axial-flux motor stator according to claim 4, wherein, The heat-conducting protruding block is in a ridge shape, and at least part of the ridge of the heat-conducting protruding block extends into the space between adjacent stator cores; and / or, The inner wall of the side wall block is attached to the stator winding.

6. The axial flux motor stator according to claim 2, characterized in that, The stator inner ring includes an annular upper fixing plate, an annular lower fixing plate and an inner ring connecting part. The upper fixing plate and the lower fixing plate are respectively fixedly arranged at both ends of the inner ring connecting part. The inner ring connecting part is a hollow connecting cylinder. The outer side wall of the upper fixing plate presses against the inside of the upper protruding end of the stator core, and the outer side wall of the lower fixing plate presses against the inside of the lower protruding end of the stator core.

7. The axial flux motor stator according to claim 6, characterized in that, The outer contours of the upper fixing plate and the lower fixing plate are both regular polygons. Each side of the upper fixing plate presses against the inside of the upper protruding end of the stator core, and each side of the lower fixing plate presses against the inside of the lower protruding end of the stator core.

8. The stator of the axial flux motor according to claim 1, characterized in that, A certain width of gap is reserved between adjacent side wall blocks; and / or, The stator winding is also fixedly bonded to the side wall block through heat-conducting glue.

9. The axial flux motor stator according to claim 1, characterized in that, A gap is provided between the stator winding and the inner ring connecting part; and / or, Heat-dissipating fins are also arranged on the outer side wall of the side wall block.

10. An axial flux motor, characterized in that, It includes an axial-flux motor stator as described in any one of claims 1-9.

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