Single-stator double-rotation axial magnetic flux motor

Abstract

The utility model provides a single-stator double-rotation axial magnetic flux motor, which comprises a stator assembly and a rotor assembly, the stator assembly comprises an inner side shell, an outer side shell and a stator mounting frame arranged between the inner side shell and the outer side shell, the inner side wall of the inner side shell is provided with a bearing chamber, and the inner periphery of the bearing chamber protrudes to form an annular boss; a first angular contact bearing is arranged on one side of the annular boss, a second angular contact bearing is arranged on the other side of the annular boss, and the first angular contact bearing and the second angular contact bearing are arranged oppositely; the rotor assembly comprises a rotating shaft, a first rotor disc and a second rotor disc, the rotating shaft penetrates through the first angular contact bearing and the second angular contact bearing, and the first rotor disc and the second rotor disc are connected with the two opposite ends of the rotating shaft respectively. The bearing chamber is arranged in the inner side shell, the space in the center of the stator assembly is fully utilized, the axial size of the motor is reduced, the two angular contact bearings are arranged oppositely, axial loads caused by rotation of rotors at the two ends of the rotating shaft can be effectively balanced and dispersed, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a single-fixed dual-rotating axial flux motor. Background Art

[0002] With the rapid development of modern industrial technology, motors, as core components for converting electrical and mechanical energy, are receiving increasing attention for their performance optimization and structural innovation. The traditional single-fixed dual-rotor axial flux motor design has certain limitations in terms of structure, especially in the configuration of the bearing chamber.

[0003] In the prior art, the bearing chamber of a single-fixed dual-rotation axial flux motor is usually directly installed on the end cover of the motor. This installation method not only increases the overall axial size of the motor, but also limits the use of the motor in certain specific application scenarios. In addition, traditional bearing chambers mostly use deep groove ball bearings as support and transmission elements. Although deep groove ball bearings perform well in radial loads, their axial load capacity is relatively limited. In some situations where they need to withstand large axial forces or high-speed operation, deep groove ball bearings often cannot meet the requirements of long-term stable operation, and are prone to wear, failure and other problems, which in turn affects the performance and life of the motor. Utility Model Content

[0004] Based on this, the purpose of the present invention is to provide a single-fixed dual-rotor axial flux motor to solve the technical problems mentioned in the above background technology.

[0005] The utility model provides a single-stator double-rotor axial flux motor, comprising a stator assembly and a rotor assembly, wherein the stator assembly comprises an inner shell, an outer shell and a stator mounting frame arranged between the inner shell and the outer shell, wherein a stator and a coil around the periphery of the stator are mounted on the stator mounting frame, wherein a bearing chamber is arranged on the inner side wall of the inner shell, wherein an inner periphery of the bearing chamber protrudes to form an annular boss, wherein a first angular contact bearing is arranged on one side of the annular boss, and a second angular contact bearing is arranged on the other side, wherein the first angular contact bearing and the second angular contact bearing are arranged in opposite directions;

[0006] The rotor assembly includes a rotating shaft, a first rotor disk and a second rotor disk. The rotating shaft is inserted into the first angular contact bearing and the second angular contact bearing. The first rotor disk and the second rotor disk are respectively connected to opposite ends of the rotating shaft and are maintained with the stator air gap.

[0007] Furthermore, in the single-fixed dual-rotor axial flux motor, the bearing chamber and the inner shell are integrally formed.

[0008] Furthermore, in the single-fixed dual-rotor axial flux motor, the bearing chamber is made of metal, the inner shell is made of plastic, and the bearing chamber and the inner shell are integrally injection-molded.

[0009] Furthermore, in the single-fixed dual-rotor axial flux motor, an insert is protruded from the outer wall of the bearing chamber, and the insert is embedded in the injection-molded inner shell.

[0010] Furthermore, in the single-fixed dual-rotation axial flux motor, the annular boss is supported on the outer ring end faces of the first angular contact bearing and the second angular contact bearing, the annular boss is provided with a plurality of through holes arranged at circumferential intervals, and a spring is correspondingly passed through each of the through holes, one end of the spring is pre-tightened to fix the outer ring end face of the first angular contact bearing, and the other end is pre-tightened to fix the outer ring end face of the second angular contact bearing;

[0011] The first rotor disk abuts against the inner ring end surface of the first angular contact bearing. A shaft shoulder is formed on the outer wall of the rotating shaft, and the shaft shoulder abuts against the inner ring end surface of the second angular contact bearing.

[0012] Furthermore, in the single-fixed dual-rotation axial flux motor, the inner periphery of the annular boss is provided with a plurality of recesses arranged circumferentially at intervals, and the recesses are located between two adjacent through holes.

[0013] Furthermore, in the single-stator dual-rotor axial flux motor, the first rotor disk includes an inner ring, a connecting ring formed by extending outwardly from the periphery of the inner ring, and an outer ring formed by extending horizontally outward from the connecting ring, the inner ring stops against the inner ring end face of the first angular contact bearing, and the outer ring maintains an air gap with the stator.

[0014] Furthermore, in the single-fixed dual-rotor axial flux motor, a spacer ring is sleeved on the rotating shaft, and the spacer ring is located between the inner ring end faces of the first angular contact bearing and the second angular contact bearing.

[0015] Furthermore, in the single-fixed dual-rotor axial flux motor, the first angular contact bearing and the second angular contact bearing are clearance-fitted with the bearing chamber.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The bearing chamber is arranged in the inner housing, making full use of the space in the center of the stator assembly. Compared with the solution in the prior art in which the bearing chamber is arranged on the motor end cover, the overall axial size of the motor can be effectively shortened, making the motor more suitable for application scenarios with limited space.

[0018] 2. Two angular contact bearings are arranged in the bearing chamber, and the two angular contact bearings are arranged back to back, which can effectively balance and disperse the axial load caused by the rotation of the rotor at both ends of the shaft, thereby ensuring the long-term stable operation of the motor and extending the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded view of the single-fixed dual-rotor axial flux motor in the utility model;

[0020] Figure 2 It is a cross-sectional view of the stator assembly in the utility model;

[0021] Figure 3 It is a cross-sectional view of the first rotor disk in the utility model;

[0022] Figure 4 This is a schematic diagram of the specific structure of the bearing chamber in the utility model;

[0023] Description of main component symbols:

[0024] 11. Inner housing; 12. Outer housing; 13. Stator mounting frame; 14. Stator; 15. Coil; 21. Rotating shaft; 22. First rotor disk; 23. Second rotor disk; 31. Bearing chamber; 32. Annular boss; 33. First angular contact bearing; 34. Second angular contact bearing; 40. Insert; 51. Through hole; 52. Spring; 53. Notch; 60. Shoulder; 61. Small diameter section; 62. Large diameter section; 221. Inner ring; 222. Connecting ring; 223. Outer ring; 70. Spacer ring; 81. Flat key; 82. Round nut; 83. Locating pin; 84. Screw.

[0025] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] See also Figures 1 to 4 The single-stator double-rotor axial flux motor in the utility model comprises a stator assembly and a rotor assembly, wherein the stator assembly comprises an inner housing 11, an outer housing 12 and a stator mounting frame 13 arranged therebetween, wherein a stator 14 and a coil 15 arranged around the periphery of the stator 14 are mounted on the stator mounting frame 13, a bearing chamber 31 is arranged on the inner side wall of the inner housing 11, and an annular boss 32 is formed on the inner periphery of the bearing chamber 31, a first angular contact bearing 33 is arranged on one side of the annular boss 32, and a second angular contact bearing 34 is arranged on the other side, and the first angular contact bearing 33 and the second angular contact bearing 34 are arranged in back to back relation;

[0030] The rotor assembly includes a rotating shaft 21, a first rotor disk 22 and a second rotor disk 23. The rotating shaft 21 is inserted into the first angular contact bearing 33 and the second angular contact bearing 34. The first rotor disk 22 and the second rotor disk 23 are respectively connected to opposite ends of the rotating shaft 21 and maintain an air gap with the stator 14.

[0031] It can be understood that the bearing chamber 31 is arranged in the inner housing 11, making full use of the space in the center of the stator assembly. Compared with the solution of arranging the bearing chamber on the motor end cover in the prior art, the overall axial size of the motor can be effectively shortened, making the motor more suitable for application scenarios with limited space. Secondly, two angular contact bearings are arranged in the bearing chamber 31, and the two angular contact bearings are arranged back to back, which can effectively balance and disperse the axial load caused by the rotation of the rotor at both ends of the shaft 21, thereby ensuring the long-term stable operation of the motor and extending the service life of the motor.

[0032] Furthermore, the bearing chamber 31 and the inner housing 11 are integrally formed. Specifically, the bearing chamber 31 and the inner housing 11 can be integrally formed by metal casting, or the bearing chamber 31 structure can be directly processed on the inner side of the inner housing 11 by milling, or integrally injection molded.

[0033] Preferably, in this embodiment, the bearing chamber 31 and the inner housing 11 are integrally injection molded, the bearing chamber 31 is made of metal, and the inner housing 11 is made of plastic. The specific preparation process is as follows: by placing the metal bearing chamber 31 in an injection mold and then injecting molten plastic, the plastic solidifies in the mold and is tightly combined with the metal bearing chamber 31. This process can achieve a high-strength connection between metal and plastic while maintaining the lightweight of the overall structure. In addition, the metal bearing chamber 31 can effectively cope with the axial and radial loads generated when the motor is running, so that the motor has a higher power density while also saving production costs.

[0034] For further information, see Figure 2 The outer wall of the bearing chamber 31 is protruded to form an insert 40, and the insert 40 is embedded in the injection-molded inner shell 11. It can be understood that after the inner shell 11 is molded and solidified, the inner shell 11 can wrap the insert 40, so that a closer contact area is formed between the inner shell 11 and the bearing chamber 31, so that the assembly between the two is more secure, reducing the risk of loosening or falling off.

[0035] It is worth mentioning that the bearing may be affected by various factors such as temperature, load, and rotation speed during operation, causing the bearing to expand or contract, thereby affecting the size of the preload. If the bearing chamber 31 cannot adapt to these changes, the preload may be insufficient or excessive, thereby affecting the working performance and service life of the bearing. In this regard, the present embodiment further improves the bearing chamber 31, as follows:

[0036] like Figure 2 and Figure 4 As shown, the annular boss 32 is supported on the outer ring end faces of the first angular contact bearing 33 and the second angular contact bearing 34, and a plurality of through holes 51 arranged at circumferential intervals are opened on the annular boss 32, and a spring 52 is correspondingly passed through each of the through holes 51, and one end of the spring 52 is pre-tightened to fix the outer ring end face of the first angular contact bearing 33, and the other end is pre-tightened to fix the outer ring end face of the second angular contact bearing 34;

[0037] The first rotor disk 22 abuts against the inner ring end surface of the first angular contact bearing 33 . A shaft shoulder 60 is formed on the outer wall of the rotating shaft 21 . The shaft shoulder 60 abuts against the inner ring end surface of the second angular contact bearing 34 .

[0038] It can be understood that a preload is applied to the outer ring end faces of the first angular contact bearing 33 and the second angular contact bearing 34 on both sides by the spring 52, so as to absorb and buffer the expansion or contraction of the bearing due to factors such as temperature, load, and rotation speed to a certain extent. When the bearing is affected by these factors and undergoes slight changes, the spring 52 can automatically adjust the preload through its telescopic performance to maintain the normal working clearance and performance of the bearing, ensuring that the rotor can run stably at a higher speed and is less prone to deflection.

[0039] It is worth mentioning that in the present embodiment, the outer ring end faces on the outer sides of the first angular contact bearing 33 and the second angular contact bearing 34 are not clamped by corresponding limiting structures. Therefore, in the present embodiment, the first angular contact bearing 33 and the second angular contact bearing 34 can both be used as floating ends, which can provide greater flexibility and adaptability.

[0040] like Figure 3 As shown, the first rotor disk 22 includes an inner ring 221, a connecting ring 222 extending outwardly from the periphery of the inner ring 221, and an outer ring 223 extending outwardly horizontally from the connecting ring 222. The inner ring 221 abuts against the inner ring end face of the first angular contact bearing 33, and the outer ring 223 maintains an air gap with the stator 14.

[0041] An external thread and a keyway are provided on the outer wall of the rotating shaft 21 at one end facing the first rotor disk 22. The first rotor disk 22 is fixedly connected to one end of the rotating shaft 21 through a flat key 81 and a round nut 82. The specific assembly steps are as follows: first, the inner ring 221 is inserted into one end of the rotating shaft 21, and the flat key 81 is inserted into the keyway to achieve radial limitation between the first rotor disk 22 and the rotating shaft 21, and then the round nut 82 is screwed in. The round nut 82 cooperates with the external thread of the outer wall of the rotating shaft 21 to force the inner ring 221 to stop against the inner ring end face of the first angular contact bearing 33, thereby completing the assembly.

[0042] like Figure 1 and Figure 2 As shown, the shaft shoulder 60 includes a small diameter section 61 and a large diameter section 62, the small diameter section 61 abuts against the inner ring end face of the second angular contact bearing 34, and the large diameter section 62 is integrally formed on the side of the small diameter section 61 away from the second angular contact bearing 34, wherein a plurality of threaded holes and positioning holes are provided on the end face of the large diameter section 62, the positioning holes are used to cooperate with the positioning pins 83 to realize the pre-fixation of the second rotor disk 23 on the rotating shaft 21, and the threaded holes are used to cooperate with the connecting screws 84 to realize the assembly of the second rotor disk 23 on the rotating shaft 21.

[0043] For further information, see Figure 4The inner periphery of the annular boss 32 is provided with a plurality of recesses 53 arranged at intervals around the circumference, and the recesses 53 are located between two adjacent through holes 51. This allows the bearing chamber 31 to meet the use requirements while reducing weight.

[0044] See also Figure 2 A spacer ring 70 is sleeved on the rotating shaft 21, and the spacer ring 70 is located between the inner ring end faces of the first angular contact bearing 33 and the second angular contact bearing 34. The spacer ring 70 has a limiting function to prevent the round nut 82 from being screwed in too deeply, causing the inner ring 221 to apply too much preload force to the inner ring end face of the first angular contact bearing 33, thereby ensuring the normal operation of the bearing and extending the service life of the bearing.

[0045] The first angular contact bearing 33 and the second angular contact bearing 34 are clearance-fitted with the bearing chamber 31. The first angular contact bearing 33 and the second angular contact bearing 34 are allowed to have a certain expansion space during thermal expansion to avoid bearing jamming or damage due to thermal stress.

[0046] In summary, in the single-stator dual-rotor axial flux motor in the above-mentioned embodiment of the utility model, the bearing chamber 31 is arranged in the inner housing 11, making full use of the space in the center of the stator assembly. Compared with the solution of arranging the bearing chamber on the motor end cover in the prior art, the overall axial size of the motor can be effectively shortened, making the motor more suitable for application scenarios with limited space. Secondly, two angular contact bearings are arranged in the bearing chamber, and the two angular contact bearings are arranged back to back, which can effectively balance and disperse the axial load caused by the rotation of the rotors at both ends of the rotating shaft 21, thereby ensuring the long-term stable operation of the motor and extending the service life of the motor.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0048] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A single-stator double-rotor axial flux motor, comprising a stator assembly and a rotor assembly, wherein the stator assembly comprises an inner housing, an outer housing and a stator mounting frame arranged therebetween, wherein a stator and a coil arranged around the periphery of the stator are mounted on the stator mounting frame, characterized in that: A bearing chamber is provided on the inner side wall of the inner shell, an annular boss is formed on the inner periphery of the bearing chamber, a first angular contact bearing is provided on one side of the annular boss, and a second angular contact bearing is provided on the other side, and the first angular contact bearing and the second angular contact bearing are arranged in back-to-back relationship; The rotor assembly includes a rotating shaft, a first rotor disk and a second rotor disk. The rotating shaft is inserted into the first angular contact bearing and the second angular contact bearing. The first rotor disk and the second rotor disk are respectively connected to opposite ends of the rotating shaft and are maintained with the stator air gap.

2. The single-fixed dual-rotor axial flux motor according to claim 1, characterized in that: The bearing chamber and the inner housing are integrally formed.

3. The single-fixed dual-rotor axial flux motor according to claim 2, characterized in that: The bearing chamber is made of metal, the inner shell is made of plastic, and the bearing chamber and the inner shell are integrally injection molded.

4. The single-fixed dual-rotor axial flux motor according to claim 3, characterized in that: An insert is protruded from the outer wall of the bearing chamber, and the insert is embedded in the injection-molded inner shell.

5. The single-fixed dual-rotor axial flux motor according to claim 1, characterized in that: The annular boss is supported on the outer ring end faces of the first angular contact bearing and the second angular contact bearing, and a plurality of through holes arranged at circumferential intervals are formed on the annular boss, and a spring is correspondingly passed through each of the through holes, and one end of the spring is pre-tightened to fix the outer ring end face of the first angular contact bearing, and the other end is pre-tightened to fix the outer ring end face of the second angular contact bearing; The first rotor disk abuts against the inner ring end surface of the first angular contact bearing. A shaft shoulder is formed on the outer wall of the rotating shaft, and the shaft shoulder abuts against the inner ring end surface of the second angular contact bearing.

6. The single-fixed dual-rotor axial flux motor according to claim 5, characterized in that: The inner periphery of the annular boss is provided with a plurality of recesses arranged at circumferential intervals, and the recesses are located between two adjacent through holes.

7. The single-fixed dual-rotor axial flux motor according to claim 5, characterized in that: The first rotor disk includes an inner ring, a connecting ring extending outwardly from the periphery of the inner ring, and an outer ring extending outwardly horizontally from the connecting ring. The inner ring abuts against the inner ring end face of the first angular contact bearing, and the outer ring maintains an air gap with the stator.

8. The single-fixed dual-rotor axial flux motor according to claim 1, characterized in that: A spacer ring is sleeved on the rotating shaft, and the spacer ring is located between the inner ring end surfaces of the first angular contact bearing and the second angular contact bearing.

9. The single-fixed dual-rotor axial flux motor according to claim 1, characterized in that: The first angular contact bearing and the second angular contact bearing are clearance-fitted with the bearing chamber.

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