Stator and rotor fixing mode and heat dissipation structure of double-stator axial flux motor

Abstract

The invention relates to the technical field of motors, in particular to a stator and rotor fixing mode and a heat dissipation structure of a double-stator axial flux motor. The motor comprises two half shells which are symmetrically connected, a plurality of stators are arranged on the inner sides of the half shells, windings are fixed to the outer sides of the stators, and heat dissipation mechanisms are assembled on the inner sides of the two half shells. The inner end faces of the half shells are filled with the first resin layers, the U-shaped heat pipes and the round heat pipes are embedded in the first resin layers, and the capacity of conducting heat generated by the stator to the outside of the motor is greatly enhanced after the U-shaped heat pipes and the round heat pipes are added due to the fact that epoxy resin has good heat conductivity. The space occupancy rate, the cooling effect, the assembly difficulty and the process requirement of the small axial flux motor are fully considered, the good cooling effect can be guaranteed under the condition that the space occupancy rate is as low as possible, meanwhile, the assembly difficulty is reduced, the requirement for the manufacturing process is low, and the small size and the good cooling effect can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator and rotor fixing method and a heat dissipation structure of a dual-stator axial flux motor. Background Art

[0002] Double Stator Single Rotor Axial Flux Motor (DSSR AFM) is a special type of motor with two stators and one rotor. It is usually used in applications that require high power density and compact design. The following is an analysis of the existing technology:

[0003] 1. The stator fixing method of this motor is crucial to its performance and reliability. The traditional stator fixing method of the double-stator single-rotor axial flux motor is generally mechanical fixing: the traditional stator fixing method relies on mechanical structures such as bolts, nuts and clamps. These methods are simple and low-cost, but there are the following problems:

[0004] 1. The size and weight of the motor may be increased.

[0005] 2. At the same time, mechanical fixing points may become areas of stress concentration, especially under dynamic load or vibration conditions, which may lead to material fatigue and structural failure.

[0006] 3. Assembly errors may be introduced during the mechanical fixing process, such as uneven torque or inconsistent preload, which may affect the performance and life of the motor.

[0007] 4. Mechanical fixing elements may generate additional vibration and noise when the motor is running, especially at high speed.

[0008] 2. Current methods of fixing the rotor and magnetic steel:

[0009] 1. Use a special adhesive to fix the magnet to the rotor core. This method can provide good fixing strength and reduce the impact of mechanical stress on the magnet. However, there is a risk of falling off in extreme cases.

[0010] 2. In traditional axial flux motors, the rotor usually adopts a straight slot design, and the magnets are directly inserted into the slots. This design is simple and easy to manufacture, but the magnets may not be firmly fixed.

[0011] 3. In small axial flux motors, due to structural and space limitations, it is difficult to cool the motor using oil cooling technology, and the effect of simply using air cooling is not good. How to dissipate the heat generated by the stator and winding to the outside of the motor has always been a difficult problem. For this reason, we propose a stator and rotor fixing method and heat dissipation structure for a dual-stator axial flux motor. Summary of the invention

[0012] The object of the present invention is to provide a stator and rotor fixing method and a heat dissipation structure for a dual-stator axial flux motor to solve the problems raised in the above background technology.

[0013] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0014] A heat dissipation structure for the stator and rotor of a dual-stator axial flux motor comprises two symmetrically connected half shells, a plurality of stators are arranged on the inner sides of the half shells, windings are fixed on the outer sides of the stators, a heat dissipation mechanism is assembled on the inner sides of the two half shells, the heat dissipation mechanism is used to dissipate heat from the stators, the heat dissipation mechanism comprises a circular groove, a U-shaped groove, a circular slot, a first resin layer and a heat conducting component, a circular groove is opened on the inner sides of the half shells, a U-shaped groove is opened on the inner end surface of the half shells, a first resin layer is cast on the outer sides of the stators and windings located inside the two half shells, a circular groove is opened on the first resin layer after being molded in the circular groove, and a heat conducting component is assembled between the stator and the half shells.

[0015] Preferably, the heat conduction component includes a circular heat pipe and a U-shaped heat pipe, a circular heat pipe is arranged on the inner side of the circular groove, a U-shaped heat pipe is arranged on the inner side of the U-shaped groove, and the circular heat pipe and the U-shaped heat pipe are cast in the first resin layer.

[0016] Preferably, the heat-conducting component further includes a second resin layer 1 and a second resin layer 2, and the outer side of the stator is also cast with a second resin layer 1 and a second resin layer 2, and the second resin layer 1 and the second resin layer 2 are in contact with the U-shaped heat pipe.

[0017] Preferably, the evaporation ends of the circular heat pipe and the U-shaped heat pipe are located in the cast first resin layer, and the condensation ends of the circular heat pipe and the U-shaped heat pipe are located on the semi-shell.

[0018] Preferably, a rotor assembly is provided on the inner side of the half shell, and the rotor assembly includes trapezoidal slots, magnetic steel and a half-layer rotor back iron. Two symmetrically arranged half-layer rotor back irons are provided on the inner side of the half shell, and the two half-layer rotor back irons are fixed by bolts. A plurality of trapezoidal slots are evenly distributed on the inner side of the half-layer rotor back iron, and a magnetic steel is clamped on the inner side of each of the trapezoidal slots facing each other.

[0019] A stator and rotor fixing method of a dual-stator axial flux motor is applicable to a heat dissipation structure of a stator and rotor of a dual-stator axial flux motor, comprising the following steps:

[0020] S: First place the round heat pipe in the round groove and insert the U-shaped heat pipe into the U-shaped groove;

[0021] S: Then pour the first resin layer. After the first resin layer is formed, a concentric circle, i.e. a circular groove, which is the same size as the stator back iron is processed on it to ensure the flatness of the stator and the accuracy of the air gap between the stator and rotor, and also reduce the vibration of the stator during operation;

[0022] S: Finally, place the stator on the circular groove processed by the first resin layer, continue to pour the second resin layer one and the second resin layer two to fix the stator and the winding, and then connect the two half shells.

[0023] It can be seen without a doubt that the above-mentioned technical solution of the present application can definitely solve the technical problem to be solved by the present application.

[0024] At the same time, through the above technical solutions, the present invention has at least the following beneficial effects:

[0025] 1. The present invention first fills the first resin layer on the inner end surface of the semi-shell, and buries the U-shaped heat pipe and the circular heat pipe therein. Since the epoxy resin itself has good thermal conductivity, the addition of the U-shaped heat pipe and the circular heat pipe greatly enhances the ability to conduct the heat generated by the stator to the outside of the motor.

[0026] 2. The present invention fully considers the space occupancy rate, cooling effect, assembly difficulty and process requirements of the small axial flux motor, and can ensure a good cooling effect at the lowest possible space occupancy rate. At the same time, it also reduces the assembly difficulty and low requirements for the manufacturing process, and can ensure a small size and good cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0028] Figure 1 It is a schematic diagram of the connection structure between the circular groove and the half shell of the present invention;

[0029] Figure 2 It is a schematic diagram of the molding structure of the first resin layer of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the circular groove of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the U-shaped heat pipe of the present invention;

[0032] Figure 5 It is a schematic diagram of the connection structure of the stator and the winding of the present invention;

[0033] Figure 6 It is a schematic diagram of a partial explosion structure of the present invention;

[0034] Figure 7 It is a schematic diagram of the internal structure of the trapezoidal groove of the present invention;

[0035] Figure 8 It is a schematic diagram of the connection structure between the magnetic steel and the half-layer rotor back iron of the present invention.

[0036] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0037] In the figure: 1. circular groove; 2. U-shaped groove; 3. circular groove; 4. stator; 5. winding; 6. second resin layer one; 7. second resin layer two; 8. circular heat pipe; 9. first resin layer; 10. U-shaped heat pipe; 11. half shell; 12. trapezoidal groove; 13. magnetic steel; 14. half layer of rotor back iron. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] Example 1

[0040] Reference Figure 1-8 A heat dissipation structure of a stator and rotor of a double-stator axial flux motor comprises two symmetrically connected half shells 11, a plurality of stators 4 are arranged on the inner side of the half shells 11, windings 5 ​​are fixed on the outer side of the stators 4, a heat dissipation mechanism is assembled on the inner side of the two half shells 11, the heat dissipation mechanism is used to dissipate heat from the stators 4, the heat dissipation mechanism comprises a circular groove 1, a U-shaped groove 2, a circular groove 3, a first resin layer 9 and a heat conducting component, a circular groove 1 is opened on the inner side of the half shells 11, a U-shaped groove 2 is opened on the inner end surface of the half shells 11, a first resin layer 9 is cast on the outer side of the stators 4 and the windings 5 ​​located in the two half shells 11, a circular groove 3 is opened on the first resin layer 9 after being formed in the circular groove 1, and a heat conducting component is assembled between the stator 4 and the half shells 11.

[0041] The heat conducting component includes a circular heat pipe 8 and a U-shaped heat pipe 10. The circular heat pipe 8 is arranged on the inner side of the circular groove 1, and the U-shaped heat pipe 10 is arranged on the inner side of the U-shaped groove 2. The circular heat pipe 8 and the U-shaped heat pipe 10 are cast in the first resin layer 9. The heat conducting component also includes a second resin layer 1 6 and a second resin layer 2 7. The outer side of the stator 4 is also cast with a second resin layer 1 6 and a second resin layer 2 7. The second resin layer 1 6 and the second resin layer 2 7 are in contact with the U-shaped heat pipe 10. The second resin layer 1 6 and the second resin layer 2 7 are in contact with the U-shaped heat pipe 10. The second layer 7 and the first resin layer 9 are epoxy resin, which itself has good thermal conductivity. After adding the circular heat pipe 8 and the U-shaped heat pipe 10, the ability to conduct the heat generated by the stator 4 to the outside of the motor is greatly enhanced. After the second resin layer 1 6, the second resin layer 2 7 and the first resin layer 9 are formed, the problem of inaccurate positioning of the stator 4 during installation can be solved, and the assembly accuracy can be ensured. While ensuring the flatness of the stator 4, the accuracy of the air gap between the stator and the rotor is also guaranteed, and the vibration of the stator 4 during operation can be reduced.

[0042] The evaporation ends of the circular heat pipe 8 and the U-shaped heat pipe 10 are located in the cast first resin layer 9 , and the condensation ends of the circular heat pipe 8 and the U-shaped heat pipe 10 are located on the semi-shell 11 . The first resin layer 9 has good thermal conductivity and can assist in heat conduction.

[0043] A rotor assembly is arranged on the inner side of the half shell 11, and the rotor assembly includes a trapezoidal slot 12, a magnetic steel 13 and a half-layer rotor back iron 14. Two symmetrically arranged half-layer rotor back irons 14 are arranged on the inner side of the half shell 11, and the two half-layer rotor back irons 14 are fixed by bolts. A plurality of trapezoidal slots 12 are evenly distributed on the inner side of the half-layer rotor back iron 14, and a magnetic steel 13 is clamped on the inner side of the trapezoidal slots 12 opposite to each other. When in use, the two half-layer rotor back irons 14 are fixed with bolts, and the trapezoidal slots 12 corresponding to each other are buckled into an integral slot, which can clamp the magnetic steel 13, can effectively fix the magnetic steel 13, and can effectively avoid the problem of the magnetic steel 13 falling off due to the use of the bonding method.

[0044] Example 2

[0045] A stator and rotor fixing method of a dual-stator axial flux motor is applicable to a heat dissipation structure of a stator and rotor of a dual-stator axial flux motor, comprising the following steps:

[0046] S1: firstly, the circular heat pipe 8 is placed in the circular groove 1, and the U-shaped heat pipe 10 is inserted into the U-shaped groove 2;

[0047] S2: Then pour the first resin layer 9. After the first resin layer 9 is formed, a concentric circle of the same size as the stator back iron is processed thereon, i.e., the circular groove 3, which is used to ensure the flatness of the stator 4 and the accuracy of the air gap between the stator and the rotor, and can also reduce the vibration of the stator 4 during operation;

[0048] S3: Finally, place the stator 4 on the circular groove 3 processed by the first resin layer 9, and continue to pour the second resin layer 1 6 and the second resin layer 2 7 to fix the stator 4 and the winding 5, and then connect the two half shells 11. This method can effectively and tightly fix the stator 4 and the winding 5 to prevent the stator 4 and the winding 5 from shaking. At the same time, the second resin layer 1 6 and the second resin layer 2 7 are tightly fitted to the stator 4 and the winding 5. The good thermal conductivity of epoxy resin is also helpful for the heat dissipation of the motor heating components.

[0049] From the above, we can know that:

[0050] The present invention addresses the following technical problems: Analysis of the prior art: The stator fixing method of this motor is crucial to its performance and reliability. The conventional stator fixing method of a double-stator single-rotor axial flux motor is generally mechanical fixing: The conventional stator fixing method relies on mechanical structures such as bolts, nuts and clamps. These methods are simple and low-cost, but have the following problems: The volume and weight of the motor may be increased. At the same time, the mechanical fixing point may become an area of ​​stress concentration, especially under dynamic load or vibration conditions, which may lead to material fatigue and structural failure. Assembly errors may be introduced during the mechanical fixing process, such as uneven torque or inconsistent preload, which may affect the performance and life of the motor. Mechanical fixing elements may generate additional vibration and noise when the motor is running, especially at high speeds. The current method of fixing the rotor to the magnetic steel: The magnetic steel is fixed to the rotor core using a special adhesive. This method can provide good fixing strength while reducing the impact of mechanical stress on the magnetic steel. However, there is a risk of falling off in extreme cases. In conventional axial flux motors, the rotor usually adopts a straight slot design, and the magnetic steel is directly inserted into the slot. This design is simple and easy to manufacture, but it may not be strong enough in fixing the magnetic steel. In a small axial flux motor, due to structural and space limitations, it is difficult to cool the motor using oil cooling technology, and the effect of simply using air cooling is not good. How to dissipate the heat generated by the stator and winding to the outside of the motor has always been a difficult problem; adopting the technical solutions of the above embodiments and through the above settings, this application will inevitably solve the above technical problems and achieve the following technical effects:

[0051] 1. The present invention first fills the first resin layer 9 on the inner end surface of the semi-shell 11, and buries the U-shaped heat pipe 10 and the circular heat pipe 8 therein. Since the epoxy resin itself has good thermal conductivity, the addition of the U-shaped heat pipe 10 and the circular heat pipe 8 greatly enhances the ability to conduct the heat generated by the stator 4 to the outside of the motor.

[0052] 2. The present invention fully considers the space occupancy rate, cooling effect, assembly difficulty and process requirements of the small axial flux motor, and can ensure a good cooling effect at the lowest possible space occupancy rate. At the same time, it also reduces the assembly difficulty and low requirements for the manufacturing process, and can ensure a small size and good cooling effect.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A heat dissipation structure of a stator and rotor of a dual-stator axial flux motor, characterized in that: The invention comprises two symmetrically connected half shells (11), wherein a plurality of stators (4) are arranged on the inner side of each of the half shells (11), windings (5) are fixed on the outer side of each of the stators (4), and a heat dissipation mechanism is arranged on the inner side of the two half shells (11), wherein the heat dissipation mechanism is used to dissipate heat from the stators (4). The heat dissipation mechanism comprises a circular groove (1), a U-shaped groove (2), a circular slot (3), a first resin layer (9) and a heat conduction component. The inner side of each of the half shells (11) is provided with a circular groove (1), the inner end surface of each of the half shells (11) is provided with a U-shaped groove (2), a first resin layer (9) is cast on the outer side of the stators (4) and windings (5) located inside the two half shells (11), and a circular slot (3) is arranged on the first resin layer (9) after being formed in the circular groove (1), and a heat conduction component is arranged between the stator (4) and the half shells (11).

2. The heat dissipation structure of the stator and rotor of the dual-stator axial flux motor according to claim 1, characterized in that: The heat conduction component comprises a circular heat pipe (8) and a U-shaped heat pipe (10); the circular heat pipe (8) is arranged on the inner side of the circular groove (1); the U-shaped heat pipe (10) is arranged on the inner side of the U-shaped groove (2); and the circular heat pipe (8) and the U-shaped heat pipe (10) are cast in a first resin layer (9).

3. The heat dissipation structure of the stator and rotor of the dual-stator axial flux motor according to claim 2, characterized in that: The heat-conducting component further comprises a second resin layer 1 (6) and a second resin layer 2 (7), and the outer side of the stator (4) is also cast with the second resin layer 1 (6) and the second resin layer 2 (7), and the second resin layer 1 (6) and the second resin layer 2 (7) are in close contact with the U-shaped heat pipe (10).

4. The heat dissipation structure of the stator and rotor of the dual-stator axial flux motor according to claim 2, characterized in that: The evaporation ends of the circular heat pipe (8) and the U-shaped heat pipe (10) are located in the cast first resin layer (9), and the condensation ends of the circular heat pipe (8) and the U-shaped heat pipe (10) are located on the semi-shell (11).

5. The heat dissipation structure of the stator and rotor of the dual-stator axial flux motor according to claim 1, characterized in that: A rotor assembly is arranged on the inner side of the half shell (11), the rotor assembly comprising a trapezoidal slot (12), a magnetic steel (13) and a half-layer rotor back iron (14); two symmetrically arranged half-layer rotor back irons (14) are arranged on the inner side of the half shell (11); the two half-layer rotor back irons (14) are fixed by bolts; a plurality of trapezoidal slots (12) are evenly distributed on the inner side of each half-layer rotor back iron (14); and a magnetic steel (13) is clamped on the inner side of each of the two opposite trapezoidal slots (12).

6. A method for fixing the stator and rotor of a dual-stator axial flux motor, applicable to the heat dissipation structure of the stator and rotor of a dual-stator axial flux motor as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1: firstly, placing the circular heat pipe (8) in the circular groove (1), and inserting the U-shaped heat pipe (10) into the U-shaped groove (2); S2: Then, a first resin layer (9) is poured. After the first resin layer (9) is formed, a concentric circle of the same size as the stator back iron is processed thereon, i.e., a circular groove (3), which is used to ensure the flatness of the stator (4) and the accuracy of the air gap between the stator and the rotor, and can also reduce the vibration of the stator (4) during operation; S3: Finally, the stator (4) is placed on the circular groove (3) processed by the first resin layer (9), and the second resin layer 1 (6) and the second resin layer 2 (7) are continuously poured to fix the stator (4) and the winding (5), and then the two half shells (11) are connected.

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