A dual-stator triple-rotor axial magnetic field motor

Abstract

The application belongs to the technical field of electric machines, and particularly relates to a double-stator three-rotor axial magnetic field electric machine. The application comprises a front end cover and a rear end cover, and a front stator assembly part and a rear stator assembly part are arranged between the front end cover and the rear end cover. The front rotor assembly part, the front stator assembly part, the connecting type middle rotor assembly component, the rear stator assembly part and the rear rotor assembly part are coaxially and sequentially arranged in sequence along the axial direction, and the front rotor assembly part and the rear rotor assembly part are coaxially fixed through the connecting type middle rotor assembly component. The whole electric machine adopts a double-stator three-rotor structure, can provide greater torque density and power density, has relatively strong practicability, and can effectively bear the front and rear axial magnetic pull of the device through the double-end multi-limit magnetic pull bearing component cooperating with the double-stator three-rotor structure. The inner and outer ring double-side multi-directional limiting and fixing structure has a reasonable and compact structure distribution and relatively strong stability.

Description

Technical Field

[0001] This invention belongs to the field of motor technology and relates to a dual-stator, three-rotor axial magnetic field motor. Background Technology

[0002] In 1821, Faraday invented the first electric motor, a disc motor. Its windings are placed radially along the disc-shaped armature core, generating axial air gap magnetic flux, hence it is also called an axial magnetic field motor. Axial magnetic field permanent magnet motors have many structural forms. According to the number of stators and rotors and their relative positions, they can be divided into four categories: single-stator / rotor structure, double-stator intermediate rotor structure, double-rotor intermediate stator structure, and multi-disc structure. Currently, the conventional axial magnetic field motors in the field are generally single-stator / single-rotor, double-stator / single-rotor, and double-rotor / single-stator structures. These types of motors have many defects in use, therefore, there is an urgent need to design a double-stator / triple-rotor axial magnetic field motor that can provide greater torque and power density, effectively withstand the front and rear axial magnetic pull of the device, has a multi-directional limiting and fixing structure on both inner and outer rings, a reasonable and compact structural distribution, and strong stability.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, a Chinese patent discloses an axial flux disc motor with a water-cooled stator hub and a dual-stator, three-rotor architecture [Application No.: 201710428779.0]. This includes a stator assembly composed of a drive-end stator assembly and a non-drive-end stator assembly, a drive-end rotor assembly, an intermediate rotor assembly, and a non-drive-end rotor assembly, as well as a non-drive-end end cover and a drive-end bearing outer cover. The non-drive-end stator assembly has a non-drive-end end cover on its outer side, a non-drive-end bearing outer cover on its end cover, and a rotary transformer assembly on its outer cover. A terminal box assembly is fixed to the base of the stator assembly, and the base has an inlet connector and an outlet connector. However, this solution still struggles to effectively bear the front and rear axial magnetic pull of the device while providing greater torque and power density during use. It also lacks a dual-sided, multi-directional limiting and fixing structure for the inner and outer rings, resulting in poor stability. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a dual-stator, three-rotor axial magnetic field motor.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions:

[0006] A dual-stator, three-rotor axial magnetic field motor includes a front cover and a rear cover. A front stator assembly and a rear stator assembly are provided between the front and rear covers. A front rotor assembly is provided between the front stator assembly and the front cover. A rear rotor assembly is provided between the rear stator assembly and the rear cover. A connecting intermediate rotor assembly is provided between the front and rear stator assemblies. The front and rear rotor assemblies are respectively connected to the connecting intermediate rotor assembly. A double-ended, multi-limit magnetic pull support is provided between the front and rear rotor assemblies. The double-ended, multi-limit magnetic pull support is alternately arranged with the connecting intermediate rotor assembly.

[0007] In the aforementioned dual-stator three-rotor axial magnetic field motor, the dual-end multi-limit magnetic pull bearing includes a front bearing and a rear bearing. The front stator assembly has a front bearing mounting position, and the front bearing is located within the front bearing mounting position of the front stator assembly. The rear stator assembly has a rear bearing mounting position, and the rear bearing is located within the rear bearing mounting position of the rear stator assembly. The front bearing and the rear bearing are fixed by an inner and outer ring limiting structure.

[0008] In the aforementioned dual-stator three-rotor axial magnetic field motor, the connecting intermediate rotor assembly includes an intermediate rotor assembly and a shaft disposed between the front stator assembly and the rear stator assembly. One end of the shaft passes through the front stator assembly and is connected to the front rotor assembly, and the other end of the shaft passes through the rear stator assembly and is connected to the rear rotor assembly.

[0009] In the aforementioned dual-stator three-rotor axial magnetic field motor, the intermediate rotor assembly includes an intermediate rotor support disposed between the front stator assembly and the rear stator assembly. The intermediate rotor support is connected to the shaft. The intermediate rotor support is provided with a plurality of radial ribs arranged in a circular array along the center point of the intermediate rotor support. The intermediate rotor support is provided with a central magnet, which is engaged with the radial ribs.

[0010] In the aforementioned dual-stator three-rotor axial magnetic field motor, the central magnet component includes several intermediate rotor magnets disposed on the intermediate rotor support. The number of intermediate rotor magnets is the same as the number of radial ribs. The intermediate rotor magnets are fan-shaped, and the intermediate rotor magnets are connected to the radial ribs through an axial positioning structure.

[0011] In the aforementioned dual-stator three-rotor axial magnetic field motor, the axial positioning structure includes several limiting bosses disposed on the radial ribs. The limiting bosses are symmetrically arranged along the center line of the radial ribs. The intermediate rotor magnet is provided with several limiting grooves symmetrically arranged along the center line of the intermediate rotor magnet. The limiting bosses and limiting grooves are engaged and cooperated with each other. The intermediate rotor support is fitted with a rotor ring hoop. The radial ribs and the intermediate rotor magnet respectively abut against the rotor ring hoop.

[0012] In the aforementioned dual-stator three-rotor axial magnetic field motor, the front stator assembly includes a front stator housing disposed between the front rotor assembly and the intermediate rotor support. The front stator housing has a front stator front shell at its front end and a front stator rear shell at its rear end. Inside the front stator housing, there is a front stator inner sleeve, several front stator cores, and several front stator coils. The several front stator cores are mutually independent and evenly distributed along the axial direction of the front stator inner sleeve. The front stator coils are wound around the circumference of the front stator cores.

[0013] In the aforementioned dual-stator three-rotor axial magnetic field motor, the rear stator assembly includes a rear stator housing disposed between the rear rotor assembly and the intermediate rotor support. The front end of the rear stator housing is provided with a rear stator front shell, and the rear end of the rear stator housing is provided with a rear stator rear shell. Inside the rear stator housing, there is a rear stator inner sleeve, several rear stator cores, and several rear stator coils. The several rear stator cores are mutually independent and evenly distributed along the axial direction of the rear stator inner sleeve. The rear stator coils are wound around the circumference of the rear stator cores. The front stator inner sleeve and the rear stator inner sleeve are located on the same axis. The front stator core and the rear stator core are aligned axially. The front stator coil and the rear stator coil are aligned axially.

[0014] In the aforementioned dual-stator three-rotor axial magnetic field motor, the front rotor assembly includes a front rotor bracket, a front rotor back iron, and a plurality of front rotor magnets disposed between the front stator assembly and the front end cover. The front rotor back iron is annular, and the plurality of front rotor magnets are evenly distributed along the axial direction of the front rotor back iron. The rear rotor assembly includes a rear rotor bracket, a rear rotor back iron, and a plurality of rear rotor magnets disposed between the rear stator assembly and the rear end cover. The rear rotor back iron is annular, and the plurality of rear rotor magnets are evenly distributed along the axial direction of the rear rotor back iron.

[0015] In the aforementioned dual-stator, three-rotor axial magnetic field motor, the front bearing mounting position is located inside the front stator inner sleeve, and the rear bearing mounting position is located inside the rear stator inner sleeve. The inner and outer ring limiting structure includes a front rotor inner ring flange, a front shoulder of the shaft, a rear shoulder, a rear rotor inner ring flange, a rear stator inner sleeve shoulder, and a rear stator bearing pressure plate. The left side of the inner ring of the front bearing abuts against the front rotor inner ring flange, the right side of the inner ring of the front bearing abuts against the front shoulder of the shaft, the left side of the inner ring of the rear bearing abuts against the rear shoulder of the shaft, the right side of the inner ring of the rear bearing abuts against the rear rotor inner ring flange, the left side of the outer ring of the rear bearing abuts against the rear stator inner sleeve shoulder, and the right side of the outer ring of the rear bearing abuts against the rear stator bearing pressure plate.

[0016] Compared with existing technologies, the advantages of this invention are:

[0017] 1. This invention arranges the front rotor assembly, front stator assembly, connecting intermediate rotor assembly, rear stator assembly, and rear rotor assembly coaxially and sequentially along the axial direction. The front rotor assembly and rear rotor assembly are located on the outermost sides, and the connecting intermediate rotor assembly is located between the front stator assembly and the rear stator assembly. The connecting intermediate rotor assembly coaxially fixes the front rotor assembly and the rear rotor assembly, ensuring that the generated magnetic field direction is the same. The front and rear covers cover and protect the front and rear ends of the device. The motor adopts a double-stator and three-rotor structure, which can provide greater torque density and power density, and has strong practicality. In addition, the double-end multi-limit magnetic pull bearing component, in conjunction with the double-stator and three-rotor structure, can effectively bear the front and rear axial magnetic pull of the device. The double-end multi-directional limiting and fixing structure with inner and outer rings has a reasonable and compact structure distribution and strong stability.

[0018] 2. In this invention, each radial rib has a radial rib inclined surface on its side, and the middle rotor magnet has an inclined surface on its side. The radial rib inclined surface and the middle rotor magnet inclined surface are connected by a limiting boss and a limiting groove to achieve axial positioning of the two with high positioning accuracy. The outer and inner sides of the middle rotor magnet cooperate with the rotor ring hoop and the middle rotor support to achieve radial positioning of the middle rotor magnet, forming a multi-positioning and fixing system with good axial and radial properties.

[0019] 3. This invention uses front and rear bearings to bear the axial magnetic pull of the rotor assembly. The left side of the inner ring of the front bearing abuts against the flange of the inner ring of the front rotor, and the right side of the inner ring of the front bearing abuts against the front shoulder of the shaft. The left side of the inner ring of the rear bearing abuts against the rear shoulder of the shaft, and the right side of the inner ring of the rear bearing abuts against the flange of the inner ring of the rear rotor. The left side of the outer ring of the rear bearing abuts against the shoulder of the inner sleeve of the rear stator, and the right side of the outer ring of the rear bearing abuts against the pressure plate of the rear stator bearing. These features limit the movement of the inner and outer rings of the front and rear bearings on both sides, thereby ensuring bidirectional axial positioning of the rotor and achieving high overall installation accuracy.

[0020] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 This is an exploded view of the present invention.

[0023] Figure 3 This is an exploded view of the front stator assembly.

[0024] Figure 4 This is a structural schematic diagram of the front stator assembly.

[0025] Figure 5 This is an exploded schematic diagram of the rear stator assembly.

[0026] Figure 6 Exploded view of the front rotor assembly.

[0027] Figure 7 This is an exploded view of the rear rotor assembly.

[0028] Figure 8 This is a cross-sectional schematic diagram of the rear rotor assembly.

[0029] Figure 9 This is an exploded view of the intermediate rotor assembly.

[0030] Figure 10 This is a schematic diagram of the intermediate rotor support structure.

[0031] Figure 11 This is a schematic diagram of the structure of the intermediate rotor magnet.

[0032] Figure 12 This is a cross-sectional schematic diagram of the present invention.

[0033] In the diagram: 1. Front cover; 2. Rear cover; 3. Front stator assembly; 4. Rear stator assembly; 5. Front rotor assembly; 6. Rear rotor assembly; 7. Connecting intermediate rotor assembly; 8. Intermediate rotor assembly; 9. Rotary shaft; 10. Intermediate rotor support; 11. Radial rib; 12. Central magnet; 13. Intermediate rotor magnet; 14. Axial positioning structure; 14. Limiting groove; 15. Limiting boss; 16. Rotor ring; 17. Front stator housing; 18. Front stator front shell; 19. Front stator rear shell; 20. Front stator inner sleeve; 21. Front stator core; 22. Front stator coil; 23. Rear stator housing. 24. Rear stator front housing; 25. Rear stator rear housing; 26. Rear stator inner sleeve; 27. Rear stator iron core; 28. Rear stator coil; 29. ​​Front rotor bracket; 30. Front rotor back iron; 31. Front rotor magnet; 32. Rear rotor bracket; 33. Rear rotor back iron; 34. Rear rotor magnet; 35. Rear shoulder; 36. Shoulder; 37. Rear stator bearing pressure plate; 38. Resolver rotor; 39. Resolver stator; 40. Front bearing; 41. Rear bearing; 50. Double-end multi-limit magnetic pull bearing; 51. Front rotor inner ring flange; 52. Shaft front shoulder; 53. Rear rotor inner ring flange; 60. Inner and outer ring limit structure. Detailed Implementation

[0034] The invention will now be further described with reference to the accompanying drawings.

[0035] like Figure 1-12 As shown, a dual-stator, three-rotor axial magnetic field motor includes a front cover 1 and a rear cover 2. The motor is characterized by having a front stator assembly 3 and a rear stator assembly 4 between the front cover 1 and the rear cover 2; a front rotor assembly 5 between the front stator assembly 3 and the front cover 1; a rear rotor assembly 6 between the rear stator assembly 4 and the rear cover 2; a connecting intermediate rotor assembly 7 between the front stator assembly 3 and the rear stator assembly 4; the front rotor assembly 5 and the rear rotor assembly 6 being respectively connected to the connecting intermediate rotor assembly 7; and a double-ended, multi-limiting magnetic pull support 50 between the front rotor assembly 5 and the rear rotor assembly 6. The double-ended, multi-limiting magnetic pull support 50 and the connecting intermediate rotor assembly 7 are alternately arranged.

[0036] In this embodiment, the front rotor assembly 5, the front stator assembly 3, the connecting intermediate rotor assembly 7, the rear stator assembly 4, and the rear rotor assembly 6 are arranged coaxially and sequentially along the axial direction. The front rotor assembly 5 and the rear rotor assembly 6 are located on the outermost sides, and the connecting intermediate rotor assembly 7 is located between the front stator assembly 3 and the rear stator assembly 4. The connecting intermediate rotor assembly 7 is used to coaxially fix the front rotor assembly 5 and the rear rotor assembly 6, which ensures that the generated magnetic field directions are the same. The front cover 1 and the rear cover 2 cover and protect the front and rear ends of the device. The motor adopts a double stator and three rotor structure, which can provide greater torque density and power density, and has strong practicality. In addition, the double-end multi-limit magnetic pull bearing 50, in conjunction with the double stator and three rotor structure, can effectively bear the front and rear axial magnetic pull of the device. The double-end multi-directional limit fixing structure with inner and outer rings has a reasonable and compact structure distribution and strong stability.

[0037] Combination Figure 1 , Figure 12 As shown, the double-ended multi-limit magnetic pull bearing 50 includes a front bearing 40 and a rear bearing 41. The front stator assembly 3 has a front bearing mounting position, and the front bearing 40 is located in the front bearing mounting position of the front stator assembly 3. The rear stator assembly 4 has a rear bearing mounting position, and the rear bearing 41 is located in the rear bearing mounting position of the rear stator assembly 4. The front bearing 40 and the rear bearing 41 are fixed by the inner and outer ring limiting structure 60.

[0038] In this embodiment, the front bearing mounting position is used to install and fix the front bearing 40, and the rear bearing mounting position is used to install and fix the rear bearing 41. The inner and outer ring limiting structures 60 limit the inner and outer rings of the front bearing 40 and the rear bearing 41 on both sides respectively. The front bearing 40 and the rear bearing 41, together with the double stator and three rotor structure, can effectively bear the front and rear axial magnetic pull of the device. The structure is reasonably and compactly distributed and has strong stability.

[0039] Combination Figure 1-12 As shown, the connecting intermediate rotor assembly 7 includes an intermediate rotor assembly 8 and a rotating shaft 9 disposed between the front stator assembly 3 and the rear stator assembly 4. One end of the rotating shaft 9 passes through the front stator assembly 3 and is connected to the front rotor assembly 5, and the other end of the rotating shaft 9 passes through the rear stator assembly 4 and is connected to the rear rotor assembly 6.

[0040] Specifically, by coaxially fixing the front stator assembly 3, the intermediate rotor assembly 8, and the front rotor assembly 5 through the rotating shaft 9, it can be ensured that the generated magnetic field direction is the same. Preferably, the resolver rotor 38 can be coaxially installed on the end of the rotating shaft 9, and the resolver stator 39 is installed on the rear end cover 2. The resolver rotor 38 and the resolver stator 39 are concentric and axially aligned, which can further enhance the magnetic field.

[0041] Combination Figure 9-11 As shown, the intermediate rotor assembly 8 includes an intermediate rotor support 10 disposed between the front stator assembly 3 and the rear stator assembly 4. The intermediate rotor support 10 is connected to the rotating shaft 9. The intermediate rotor support 10 is provided with a plurality of radial ribs 11 arranged in a ring array along the center point of the intermediate rotor support 10. The intermediate rotor support 10 is provided with a central magnet 12, which is engaged with the radial ribs 11.

[0042] In this embodiment, the intermediate rotor support 10 consists of an inner ring and radial ribs 11. The central magnet 12 is engaged with the radial ribs 11 for assembly, resulting in high installation precision. The intermediate rotor support 10 is made of high-strength metal (aluminum alloy or steel) or high-strength non-metallic materials (glass fiber composite material, carbon fiber composite material, or plastics such as PPS, PPA, PA, PEEK, etc.). The intermediate rotor support 10 is connected to the rotating shaft 9 on its inner side. To reduce the wear of the intermediate rotor support 10, non-metallic materials are preferred.

[0043] The central magnet component 12 includes a plurality of intermediate rotor magnets 13 disposed on the intermediate rotor support 10. The number of intermediate rotor magnets 13 is the same as the number of radial ribs 11. The intermediate rotor magnets 13 are fan-shaped. The intermediate rotor magnets 13 and the radial ribs 11 are connected by an axial positioning structure 14.

[0044] In this embodiment, each radial rib 11 has a radial rib 11 inclined surface on its side, and the middle rotor magnet 13 has an inclined surface on its side. The radial rib 11 inclined surface and the middle rotor magnet 13 inclined surface are connected by an axial positioning structure 14 to achieve axial positioning of the two with high positioning accuracy.

[0045] Combination Figure 9-11 As shown, the axial positioning structure 14 includes a plurality of limiting bosses 15 disposed on the radial ribs 11. The plurality of limiting bosses 15 are symmetrically arranged along the center line of the radial ribs 11. The intermediate rotor magnet 13 is provided with a plurality of limiting grooves 144 symmetrically arranged along the center line of the intermediate rotor magnet 13. The limiting bosses 15 and the limiting grooves 144 are engaged with each other. The intermediate rotor support 10 is fitted with a rotor ring hoop 16. The radial ribs 11 and the intermediate rotor magnet 13 respectively abut against the rotor ring hoop 16.

[0046] In this embodiment, each radial rib 11 has a radial rib 11 inclined surface on its side, and the intermediate rotor magnet 13 has an inclined surface on its side. The radial rib 11 inclined surface and the intermediate rotor magnet 13 inclined surface are connected by a limiting boss 15 and a limiting groove 144 to achieve axial positioning of the two with high positioning accuracy. The outer and inner sides of the intermediate rotor magnet 13 cooperate with the rotor ring hoop 16 and the intermediate rotor support 10 respectively to achieve radial positioning of the intermediate rotor magnet 13, forming a multi-positioning and fixing of the axial and radial sides with good fixing effect. The intermediate rotor magnet 13 is composed of neodymium iron boron, aluminum nickel cobalt, samarium cobalt, and ferrite, and each magnet is evenly distributed along the axial direction.

[0047] The front stator assembly 3 includes a front stator housing 17 disposed between the front rotor assembly 5 and the intermediate rotor support 10. The front stator housing 17 has a front stator front shell 18 at its front end and a front stator rear shell 19 at its rear end. The front stator housing 17 contains a front stator inner sleeve 20, a plurality of front stator cores 21 and a plurality of front stator coils 22. The plurality of front stator cores 21 are mutually independent and evenly distributed along the axial direction of the front stator inner sleeve 20. The front stator coils 22 are wound around the circumference of the front stator cores 21.

[0048] In this embodiment, the front stator assembly 3 is composed of the following structure: front stator housing 17, front stator front shell 18, front stator rear shell 19, front stator inner sleeve 20, front stator core 21, and front stator coil 22. The material of the front stator housing 17 can be metal (aluminum alloy or steel) or high-strength non-metallic material (glass fiber composite material, carbon fiber composite material or plastic such as PPS, PPA, PA, PEEK, etc.). The front stator front shell 18 and the front stator rear shell 19 need to be high-strength non-magnetic and non-conductive non-metallic materials (glass fiber composite material, carbon fiber composite material or plastic such as PPS, PPA, PA, PEEK, etc.). The front stator core 21 is a soft magnetic composite material (SMC) or silicon steel sheet. The front stator inner sleeve 20 is installed in the inner hole of the front stator assembly. The material of the front stator inner sleeve 20 is steel.

[0049] The rear stator assembly 4 includes a rear stator housing 23 disposed between the rear rotor assembly 6 and the intermediate rotor support 10. The rear stator housing 23 has a rear stator front housing 24 at its front end and a rear stator rear housing 25 at its rear end. The rear stator housing 23 contains a rear stator inner sleeve 26, a plurality of rear stator cores 27, and a plurality of rear stator coils 28. The plurality of rear stator cores 27 are mutually independent and evenly distributed along the axial direction of the rear stator inner sleeve 26. The rear stator coils 28 are wound around the circumference of the rear stator cores 27. The front stator inner sleeve 20 and the rear stator inner sleeve 26 are located on the same axis. The front stator core 21 and the rear stator core 27 are aligned axially. The front stator coil 22 and the rear stator coil 28 are aligned axially.

[0050] In this embodiment, the rear stator assembly 4 is composed of the following structure: rear stator outer shell 23, rear stator front shell 24, rear stator rear shell 25, rear stator inner sleeve 26, rear stator core 27, and rear stator coil 28. The material of the rear stator outer shell 23 can be metal (aluminum alloy or steel) or high-strength non-metallic material (glass fiber composite material, carbon fiber composite material or plastic such as PPS, PPA, PA, PEEK, etc.). The rear stator front shell 24 and rear stator rear shell 25 need to be high-strength non-magnetic and non-conductive non-metallic materials (glass fiber composite material, carbon fiber composite material or plastic such as PPS, PPA, PA, PEEK, etc.). The rear stator core 27 is a soft magnetic composite material (SMC) or silicon steel sheet. The rear stator inner sleeve 26 is installed in the inner hole of the rear stator assembly. The material of the rear stator inner sleeve 26 is steel. The front stator and the rear stator are concentric, and their respective cores and coils are aligned axially.

[0051] Combination Figure 6 As shown, the front rotor assembly 5 includes a front rotor bracket 29, a front rotor back iron 30, and a plurality of front rotor magnets 31 disposed between the front stator assembly 3 and the front end cover 1. The front rotor back iron 30 is annular, and the plurality of front rotor magnets 31 are evenly distributed along the axial direction of the front rotor back iron 30.

[0052] In this embodiment, the front rotor assembly 5 consists of a front rotor bracket 29, a front rotor back iron 30, and front rotor magnets 31. The front rotor bracket 29 is made of high-strength metal (aluminum alloy or steel) or high-strength non-metallic material (glass fiber composite material, carbon fiber composite material, or plastics such as PPS, PPA, PA, PEEK, etc.), and is connected to the rotating shaft 9 on the inner side. The front rotor back iron 30 is annular and made of magnetically conductive metal (SMC or silicon steel sheet). The front rotor magnets 31 are made of neodymium iron boron, AlNiCo, Samarium Cobalt, or ferrite, and the front rotor magnets 31 are evenly distributed along the axial direction.

[0053] Combination Figure 6 , Figure 7As shown, the rear rotor assembly 6 includes a rear rotor bracket 32, a rear rotor back iron 33, and a plurality of rear rotor magnets 34 disposed between the rear stator assembly 4 and the rear end cover 2. The rear rotor back iron 33 is annular, and the plurality of rear rotor magnets 34 are evenly distributed along the axial direction of the rear rotor back iron 33.

[0054] In this embodiment, the rear rotor assembly 6 consists of a rear rotor bracket 32, a rear rotor back iron 33, and rear rotor magnets 34. The rear rotor bracket 32 ​​is made of high-strength metal (aluminum alloy or steel) or high-strength non-metallic material (glass fiber composite material, carbon fiber composite material, or plastics such as PPS, PPA, PA, PEEK, etc.), and is connected to the rotating shaft 9 on the inner side. The rear rotor back iron 33 is annular and made of magnetically conductive metal (SMC or silicon steel sheet). The rear rotor magnets 34 are made of neodymium iron boron, AlNiCo, Samarium Cobalt, or ferrite. The rear rotor magnets 34 are evenly distributed along the axial direction. The number of front rotor magnets 31, rear rotor magnets 34, and intermediate rotor magnets 13 is the same, and the center lines of the front rotor magnets 31, rear rotor magnets 34, and intermediate rotor magnets 13 are aligned along the axial direction. The magnetic field generated by the magnets at the aligned positions of the front and rear rotors and the intermediate rotor is in the same direction.

[0055] Combination Figure 1 , Figure 12 As shown, the front bearing mounting position is located inside the front stator inner sleeve 20, and the rear bearing mounting position is located inside the rear stator inner sleeve 26. The inner and outer ring limiting structure 60 includes a front rotor inner ring flange 51, a front shoulder 52 of the shaft, a rear shoulder 35, a rear rotor inner ring flange 53, a rear stator inner sleeve shoulder 36, and a rear stator bearing pressure plate 37. The left side of the inner ring of the front bearing 40 abuts against the front rotor inner ring flange 51, and the right side of the inner ring of the front bearing 40 abuts against the front shoulder 52 of the shaft. The left side of the inner ring of the rear bearing 41 abuts against the rear shoulder 35 of the shaft 9, and the right side of the inner ring of the rear bearing 41 abuts against the rear rotor inner ring flange 53. The left side of the outer ring of the rear bearing 41 abuts against the rear stator inner sleeve shoulder 36, and the right side of the outer ring of the rear bearing 41 abuts against the rear stator bearing pressure plate 37.

[0056] In this embodiment, the front bearing 40 is a floating bearing, installed in the front stator inner sleeve 20, and the rear bearing 41 is a positioning bearing, installed in the rear stator inner sleeve 26, used to bear the axial magnetic pull of the rotor assembly. The left side of the inner ring of the front bearing 40 abuts against the flange 51 of the inner ring of the front rotor, and the right side of the inner ring of the front bearing 40 abuts against the front shoulder 52 of the shaft. The left side of the inner ring of the rear bearing 41 abuts against the rear shoulder 35 of the shaft 9, and the right side of the inner ring of the rear bearing 41 abuts against the flange 53 of the inner ring of the rear rotor. The left side of the outer ring of the rear bearing 41 abuts against the shoulder 36 of the rear stator inner sleeve, and the right side of the outer ring of the rear bearing 41 abuts against the rear stator bearing pressure plate 37. The inner and outer rings of the front bearing 40 and the rear bearing 41 are respectively limited on both sides to ensure the bidirectional axial positioning of the rotor. The overall installation accuracy is high and the stability is strong.

[0057] In this embodiment, the rear bearing 41 is a double-row angular contact bearing;

[0058] In addition to double-row angular contact bearings, locating bearings can also be deep groove ball bearings, four-point contact ball bearings, angular contact ball bearings, etc., while floating bearings are generally deep groove ball bearings.

[0059] The working principle of this invention is:

[0060] The front stator assembly 3, the intermediate rotor assembly 8, and the front rotor assembly 5 are coaxially fixed by the rotating shaft 9, ensuring that the generated magnetic field directions are the same. Preferably, a resolver rotor 38 can be coaxially mounted on the end of the rotating shaft 9, and a resolver stator 39 is mounted on the rear end cover 2. The resolver rotor 38 and the resolver stator 39 are concentric and axially aligned, which can further strengthen the magnetic field. The front end cover 1 and the rear end cover 2 cover and protect the front and rear ends of the device. The motor adopts a dual-stator, three-rotor structure, which can provide greater torque density and power density, and has strong practicality.

[0061] The intermediate rotor support 10 consists of an inner ring and radial ribs 11. The central magnet 12 is engaged with the radial ribs 11 for assembly, ensuring high installation precision. The intermediate rotor support 10 is made of high-strength metal (aluminum alloy or steel) or high-strength non-metallic materials (glass fiber composites, carbon fiber composites, or plastics such as PPS, PPA, PA, PEEK, etc.). The intermediate rotor support 10 is connected to the rotating shaft 9 on its inner side. To reduce wear on the intermediate rotor support 10, non-metallic materials are preferred.

[0062] Each radial rib 11 has a sloping surface on its side. The intermediate rotor magnet 13 also has a sloping surface on its side. The sloping surfaces of the radial ribs 11 and the intermediate rotor magnet 13 are connected by a limiting boss 15 and a limiting groove 144 to achieve axial positioning of the two with high positioning accuracy. The outer and inner sides of the intermediate rotor magnet 13 cooperate with the rotor ring 16 and the intermediate rotor support 10, respectively, to achieve radial positioning of the intermediate rotor magnet 13. The intermediate rotor magnet 13 is composed of neodymium iron boron, AlNiCo, Samarium Cobalt, and ferrite, and the magnets are evenly distributed along the axial direction.

[0063] The front stator assembly 3 comprises the following structure: a front stator housing 17, a front stator front shell 18, a front stator rear shell 19, a front stator inner sleeve 20, a front stator core 21, and a front stator coil 22. The front stator housing 17 can be made of metal (aluminum alloy or steel) or high-strength non-metallic materials (glass fiber composites, carbon fiber composites, or plastics such as PPS, PPA, PA, PEEK, etc.). The front stator front shell 18 and front stator rear shell 19 must be made of high-strength non-magnetic and non-conductive non-metallic materials (glass fiber composites, carbon fiber composites, or plastics such as PPS, PPA, PA, PEEK, etc.). The front stator core 21 is made of soft magnetic composite material (SMC) or silicon steel sheet. The front stator inner sleeve 20 is installed in the inner hole of the front stator assembly; the material of the front stator inner sleeve 20 is steel.

[0064] The rear stator assembly 4 comprises the following structures: rear stator housing 23, rear stator front housing 24, rear stator rear housing 25, rear stator inner sleeve 26, rear stator core 27, and rear stator coil 28. The rear stator housing 23 can be made of metal (aluminum alloy or steel) or high-strength non-metallic materials (glass fiber composites, carbon fiber composites, or plastics such as PPS, PPA, PA, PEEK, etc.). The rear stator front housing 24 and rear stator rear housing 25 must be made of high-strength non-magnetic and non-conductive non-metallic materials (glass fiber composites, carbon fiber composites, or plastics such as PPS, PPA, PA, PEEK, etc.). The rear stator core 27 is made of soft magnetic composite material (SMC) or silicon steel sheet. The rear stator inner sleeve 26, made of steel, is installed inside the rear stator assembly. The front and rear stators are concentric, and their respective cores and coils are aligned axially.

[0065] The front rotor assembly 5 consists of a front rotor bracket 29, a front rotor back iron 30, and front rotor magnets 31. The front rotor bracket 29 is made of high-strength metal (aluminum alloy or steel) or high-strength non-metallic materials (glass fiber composites, carbon fiber composites, or plastics such as PPS, PPA, PA, PEEK, etc.), and is connected to the rotating shaft 9 on its inner side. The front rotor back iron 30 is annular and made of magnetically conductive metal (SMC or silicon steel sheets). The front rotor magnets 31 are made of neodymium iron boron, AlNiCo, Samarium cobalt, or ferrite, and are uniformly distributed axially, resulting in a uniform magnetic force distribution.

[0066] The rear rotor assembly 6 consists of a rear rotor bracket 32, a rear rotor back iron 33, and rear rotor magnets 34. The rear rotor bracket 32 ​​is made of high-strength metal (aluminum alloy or steel) or high-strength non-metallic materials (glass fiber composites, carbon fiber composites, or plastics such as PPS, PPA, PA, PEEK, etc.), and is connected to the rotating shaft 9 on its inner side. The rear rotor back iron 33 is annular and made of magnetically conductive metal (SMC or silicon steel sheets). The rear rotor magnets 34 are made of neodymium iron boron, AlNiCo, SmCo, or ferrite. All rear rotor magnets 34 are evenly distributed axially. The number of front rotor magnets 31, rear rotor magnets 34, and intermediate rotor magnets 13 is the same, and the center lines of the front rotor magnets 31, rear rotor magnets 34, and intermediate rotor magnets 13 are aligned axially. Furthermore, the magnetic field directions generated by the magnets at the aligned positions of the front and rear rotors and the intermediate rotor are the same, ensuring torque and power density.

[0067] The front bearing 40 is a floating bearing, installed in the inner sleeve 20 of the front stator, and the rear bearing 41 is a positioning bearing, installed in the inner sleeve 26 of the rear stator, used to bear the axial magnetic pull of the rotor assembly. The left side of the inner ring of the front bearing 40 abuts against the inner ring flange 51 of the front rotor, and the right side of the inner ring of the front bearing 40 abuts against the front shoulder 52 of the shaft. The left side of the inner ring of the rear bearing 41 abuts against the rear shoulder 35 of the shaft 9, and the right side of the inner ring of the rear bearing 41 abuts against the inner ring flange 53 of the rear rotor. The left side of the outer ring of the rear bearing 41 abuts against the shoulder 36 of the inner sleeve of the rear stator, and the right side of the outer ring of the rear bearing 41 abuts against the rear stator bearing pressure plate 37. The inner and outer rings of the front bearing 40 and the rear bearing 41 are respectively limited on both sides to ensure the bidirectional axial positioning of the rotor and the overall installation accuracy is high.

[0068] In addition to double-row angular contact bearings, locating bearings can also be deep groove ball bearings, four-point contact ball bearings, angular contact ball bearings, etc., while floating bearings are generally deep groove ball bearings.

[0069] The specific embodiments described herein are merely illustrative examples of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention.

[0070] Although this article frequently uses terms such as front cover 1, rear cover 2, front stator assembly 3, rear stator assembly 4, front rotor assembly 5, rear rotor assembly 6, connecting intermediate rotor assembly 7, intermediate rotor assembly 8, shaft 9, intermediate rotor support 10, radial rib 11, central magnet 12, intermediate rotor magnet 13, axial positioning structure 14, limiting groove 144, limiting boss 15, rotor ring 16, front stator housing 17, front stator front shell 18, front stator rear shell 19, front stator inner sleeve 20, front stator core 21, front stator coil 22, rear stator housing 23, rear stator front shell 24. Rear stator housing; 25. Rear stator inner sleeve; 26. Rear stator core; 27. Rear stator coil; 28. Front rotor support; 29. ​​Front rotor back iron; 30. Front rotor magnet; 31. Rear rotor support; 32. Rear rotor back iron; 33. Rear rotor magnet; 34. Rear shoulder; 35. Shoulder; 36. Rear stator bearing pressure plate; 37. Resolver rotor; 38. Resolver stator; 39. Front bearing; 40. Rear bearing; 41. Double-ended multi-limit magnetic pull support; 50. Front rotor inner ring flange; 51. Shaft front shoulder; 52. Rear rotor inner ring flange; 53. Inner and outer ring limiting structure; 60, etc. However, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A dual-stator, three-rotor axial magnetic field motor, comprising a front end cover (1) and a rear end cover (2), characterized in that, A front stator assembly (3) and a rear stator assembly (4) are provided between the front end cover (1) and the rear end cover (2). A front rotor assembly (5) is provided between the front stator assembly (3) and the front end cover (1). A rear rotor assembly (6) is provided between the rear stator assembly (4) and the rear end cover (2). A connecting intermediate rotor assembly (7) is provided between the front stator assembly (3) and the rear stator assembly (4). The front rotor assembly (5) and the rear rotor assembly (6) are respectively connected to the connecting intermediate rotor assembly (7). A double-ended multi-limit magnetic pull support (50) is provided between the front rotor assembly (5) and the rear rotor assembly (6). The double-ended multi-limit magnetic pull support (50) and the connecting intermediate rotor assembly (7) are staggered. The double-ended multi-limit magnetic pull bearing (50) includes a front bearing (40) and a rear bearing (41). The front stator assembly (3) is provided with a front bearing mounting position. The front bearing (40) is located in the front bearing mounting position of the front stator assembly (3). The rear stator assembly (4) is provided with a rear bearing mounting position. The rear bearing (41) is located in the rear bearing mounting position of the rear stator assembly (4). The front bearing (40) and the rear bearing (41) are abutted and fixed by an inner and outer ring limiting structure (60). The inner and outer ring limiting structure (60) includes a front rotor inner ring flange (51), a front shoulder (52) of the shaft, a rear shoulder (35), a rear rotor inner ring flange (53), a rear stator inner sleeve shoulder (36), and a rear stator bearing pressure plate (37). The left side of the inner ring of the front bearing (40) abuts against the front rotor inner ring flange (51), the right side of the inner ring of the front bearing (40) abuts against the front shoulder (52) of the shaft, the left side of the inner ring of the rear bearing (41) abuts against the rear shoulder (35), the right side of the inner ring of the rear bearing (41) abuts against the rear rotor inner ring flange (53), the left side of the outer ring of the rear bearing (41) abuts against the rear stator inner sleeve shoulder (36), and the right side of the outer ring of the rear bearing (41) abuts against the rear stator bearing pressure plate (37).

2. The dual-stator, three-rotor axial magnetic field motor according to claim 1, characterized in that, The connecting intermediate rotor assembly (7) includes an intermediate rotor assembly (8) and a shaft (9) disposed between the front stator assembly (3) and the rear stator assembly (4). One end of the shaft (9) passes through the front stator assembly (3) and is connected to the front rotor assembly (5). The other end of the shaft (9) passes through the rear stator assembly (4) and is connected to the rear rotor assembly (6).

3. A dual-stator, three-rotor axial magnetic field motor according to claim 2, characterized in that, The intermediate rotor assembly (8) includes an intermediate rotor bracket (10) disposed between the front stator assembly (3) and the rear stator assembly (4). The intermediate rotor bracket (10) is connected to the rotating shaft (9). The intermediate rotor bracket (10) is provided with a plurality of radial ribs (11) arranged in a ring array along the center point of the intermediate rotor bracket (10). The intermediate rotor bracket (10) is provided with a central magnet (12), and the central magnet (12) is engaged with the radial ribs (11).

4. A dual-stator, three-rotor axial magnetic field motor according to claim 3, characterized in that, The central magnet component (12) includes a number of intermediate rotor magnets (13) disposed on the intermediate rotor support (10). The number of intermediate rotor magnets (13) is the same as the number of radial ribs (11). The intermediate rotor magnets (13) are fan-shaped. The intermediate rotor magnets (13) and the radial ribs (11) are connected by an axial positioning structure (14).

5. A dual-stator, three-rotor axial magnetic field motor according to claim 4, characterized in that, The axial positioning structure (14) includes several limiting bosses (15) set on the radial ribs (11). The limiting bosses (15) are symmetrically arranged along the center line of the radial ribs (11). The intermediate rotor magnet (13) is provided with several limiting grooves (144) symmetrical along the center line of the intermediate rotor magnet (13). The limiting bosses (15) and the limiting grooves (144) are engaged. The intermediate rotor support (10) is fitted with a rotor ring hoop (16). The radial ribs (11) and the intermediate rotor magnet (13) respectively abut against the rotor ring hoop (16).

6. A dual-stator, three-rotor axial magnetic field motor according to claim 5, characterized in that, The front stator assembly (3) includes a front stator housing (17) disposed between the front rotor assembly (5) and the intermediate rotor support (10). The front stator housing (17) has a front stator front shell (18) at its front end and a front stator rear shell (19) at its rear end. The front stator housing (17) contains a front stator inner sleeve (20), a plurality of front stator cores (21), and a plurality of front stator coils (22). The plurality of front stator cores (21) are mutually independent and evenly distributed along the axial direction of the front stator inner sleeve (20). The front stator coils (22) are wound around the circumference of the front stator cores (21).

7. A dual-stator, three-rotor axial magnetic field motor according to claim 6, characterized in that, The rear stator assembly (4) includes a rear stator housing (23) disposed between the rear rotor assembly (6) and the intermediate rotor support (10). The rear stator housing (23) has a rear stator front shell (24) at its front end and a rear stator rear shell (25) at its rear end. The rear stator housing (23) contains a rear stator inner sleeve (26), several rear stator cores (27), and several rear stator coils (28). The several rear stator cores (27) are mutually independent and evenly distributed along the axial direction of the rear stator inner sleeve (26). The rear stator coils (28) are wound around the circumference of the rear stator cores (27). The front stator inner sleeve (20) and the rear stator inner sleeve (26) are located on the same axis. The front stator core (21) and the rear stator core (27) are aligned along the axial direction. The front stator coil (22) and the rear stator coil (28) are aligned along the axial direction.

8. A dual-stator, three-rotor axial magnetic field motor according to claim 1, characterized in that, The front rotor assembly (5) includes a front rotor bracket (29), a front rotor back iron (30), and a plurality of front rotor magnets (31) disposed between the front stator assembly (3) and the front end cover (1). The front rotor back iron (30) is annular, and the plurality of front rotor magnets (31) are evenly distributed along the axial direction of the front rotor back iron (30). The rear rotor assembly (6) includes a rear rotor bracket (32), a rear rotor back iron (33), and a plurality of rear rotor magnets (34) disposed between the rear stator assembly (4) and the rear end cover (2). The rear rotor back iron (33) is annular, and the plurality of rear rotor magnets (34) are evenly distributed along the axial direction of the rear rotor back iron (33).

9. A dual-stator, three-rotor axial magnetic field motor according to claim 7, characterized in that, The front bearing mounting position is located inside the front stator inner sleeve (20), and the rear bearing mounting position is located inside the rear stator inner sleeve (26).

Images