Monotonic magnetic ring dual-rotor and modulation dual-rotor axial magnetic gear and automobile hub motor

Abstract

The invention provides a single-magnetic-ring dual-modulation two-rotor axial magnetic gear and an automobile hub motor. The magnetic gear comprises a high-speed rotor, a dual-modulation magnetic ring and a low-speed rotor which are coaxially arranged. The dual-modulation magnetic modulation ring is nested between the high-speed rotor and the low-speed rotor; the high-speed rotor is composed of a high-speed rotor first group of permanent magnets, a high-speed rotor second group of permanent magnets and a high-speed rotor connecting bridge; the high-speed rotor first group of permanent magnets and the high-speed rotor second group of permanent magnets are connected by the high-speed rotor connecting bridge and rotate together; the low-speed rotor is composed of a first set of low-speed rotor permanent magnets, a second set of low-speed rotor permanent magnets and a low-speed rotor connecting bridge. The first set of low-speed rotor permanent magnets and the second set of low-speed rotor permanent magnets are connected through the low-speed rotor connecting bridge and rotate together. The torque transmission capacity of the magnetic gear can be improved, the magnetic saturation phenomenon is restrained, the magnetic field modulation effect is enhanced, and the torque density of the magnetic gear is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a monotone magnetic ring dual-modulation dual-rotor axial magnetic gear and an automobile hub motor. Background Art

[0002] New energy vehicles (NEVs) have garnered widespread attention from R&D professionals due to their zero-emission and high-energy efficiency. Among these, those with distributed drive systems are a trend in the development of NEVs, offering advantages such as a simple transmission structure, high transmission efficiency, and flexible vehicle control. Direct-drive in-wheel motors, as the core power component of distributed drive systems, are typically connected directly to the wheels. They not only face the output torque performance requirements of the vehicle's powertrain under conditions such as acceleration, deceleration, and climbing, but also must meet the drive requirements for stable operation under complex road conditions such as rugged mountain roads and muddy roads. Therefore, achieving excellent low-speed, high-torque capabilities is a key concern in the field of in-wheel motor research. Furthermore, given the limited space inside a vehicle's wheel hub, achieving higher torque density presents a challenging problem that must be addressed in the design of in-wheel motors.

[0003] Under the influence of the modulating core, magnetic gears can achieve bidirectional modulation of low-speed and high-speed magnetic fields, thereby achieving electromechanical energy conversion through harmonic magnetic field coupling. Because the inner and outer rotors are driven by modulated magnetic field coupling and do not contact each other during transmission, magnetic gears have advantages over mechanical gears, such as no frictional vibration, no need for lubrication and maintenance, no noise, and a compact structure. They have broad application prospects in the field of field-modulated hub motors for new energy vehicles.

[0004] However, how to improve the torque transmission capability of magnetic gears, suppress magnetic saturation, enhance the magnetic field modulation effect, and increase the torque density of magnetic gears are technical problems that need to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a monotonic magnetic ring dual-modulated dual-rotor axial magnetic gear and an automotive hub motor to improve the torque transmission capability of the magnetic gear, suppress magnetic saturation, enhance the magnetic field modulation effect, and increase the torque density of the magnetic gear.

[0006] One aspect of the present invention provides a monotonic magnetic ring dual-modulation dual-rotor axial magnetic gear, comprising a coaxially arranged high-speed rotor, a dual-modulation magnetic ring, and a low-speed rotor; the dual-modulation magnetic ring is nested between the high-speed rotor and the low-speed rotor; The high-speed rotor is composed of a first group of permanent magnets of the high-speed rotor, a second group of permanent magnets of the high-speed rotor, and a high-speed rotor connecting bridge. The first group of permanent magnets of the high-speed rotor and the second group of permanent magnets of the high-speed rotor are connected by the high-speed rotor connecting bridge and rotate together. The low-speed rotor is composed of a first group of permanent magnets of the low-speed rotor, a second group of permanent magnets of the low-speed rotor, and a low-speed rotor connecting bridge. The first group of permanent magnets of the low-speed rotor and the second group of permanent magnets of the low-speed rotor are connected by the low-speed rotor connecting bridge and rotate together. The permanent magnets on the first group of permanent magnets of the high-speed rotor, the second group of permanent magnets of the high-speed rotor, the first group of permanent magnets of the low-speed rotor, and the second group of permanent magnets of the low-speed rotor are all tangentially magnetized, and the magnetization directions of two adjacent permanent magnets in the high-speed rotor are opposite, and the magnetization directions of two adjacent permanent magnets in the low-speed rotor are opposite; There is an axial magnetic circuit and two transverse magnetic circuits between the first group of permanent magnets of the high-speed rotor, the double-modulation magnetic adjustment ring and the first group of permanent magnets of the low-speed rotor; there is an axial magnetic circuit and two transverse magnetic circuits between the second group of permanent magnets of the high-speed rotor, the double-modulation magnetic adjustment ring and the second group of permanent magnets of the low-speed rotor; The magnetic field modulation method between the first group of permanent magnets of the high-speed rotor and the first group of permanent magnets of the low-speed rotor adopts sum modulation, and the magnetic field modulation method between the second group of permanent magnets of the high-speed rotor and the second group of permanent magnets of the low-speed rotor adopts sum modulation, and the two sum modulations share a double-modulation magnetic tuning ring to achieve a double modulation effect of a single-tone magnetic ring; when the magnetic gear is working, the double-modulation magnetic tuning ring is fixed, and external power is input by the high-speed rotor. After the magnetic fields generated by the poles of the first group of permanent magnets of the high-speed rotor and the second group of permanent magnets of the high-speed rotor are sum-modulated by the double-modulation magnetic tuning ring, effective harmonics are generated in the air gap and coupled with the magnetic fields generated by the magnetic poles on the first group of permanent magnets of the low-speed rotor and the magnetic poles on the second group of permanent magnets of the low-speed rotor, respectively, to achieve power transmission from the high-speed rotor to the low-speed rotor.

[0007] Another aspect of the present invention provides an automotive hub motor, which includes the magnetic gear described above.

[0008] The monotonic magnetic ring dual-modulation dual-rotor axial magnetic gear and automobile hub motor provided by the present invention have the following beneficial effects: (1) The magnetic field modulation method between the first group of permanent magnets of the high-speed rotor and the first group of permanent magnets of the low-speed rotor adopts sum modulation, and the magnetic field modulation method between the second group of permanent magnets of the high-speed rotor and the second group of permanent magnets of the low-speed rotor adopts sum modulation, and the two sum modulations share a double-modulation magnetic ring to achieve a single-modulation magnetic ring double-modulation effect. Compared with the traditional double-modulation magnetic ring double-modulation magnetic gear topology structure, the magnetic gear magnetic gear provided by the present invention uses less magnetic core, has a more compact structure, and is smaller in size. It has more advantages in relatively narrow space usage scenarios such as automotive hub motors; (2) The magnetic gear provided by the present invention has a stronger field modulation effect and higher torque transmission capability compared with the traditional topological structure of the same size because the magnetic gear adopts both field modulation and modulation between the first set of permanent magnets of the high-speed rotor and the first set of permanent magnets of the low-speed rotor, and between the second set of permanent magnets of the high-speed rotor and the second set of permanent magnets of the low-speed rotor. (3) The magnetic gear provided by the present invention adopts tangential magnetization for the permanent magnets on the high-speed rotor and the low-speed rotor, and pole shoes are embedded in the two adjacent permanent magnets for auxiliary modulation, so that the air gap magnetic flux density is larger, the waveform is close to the sine waveform, the torque transmission capacity is improved, and the transmission is more stable; (4) There is an axial magnetic circuit and two transverse magnetic circuits between the first group of permanent magnets of the high-speed rotor, the double-modulation magnetic adjustment ring and the first group of permanent magnets of the low-speed rotor; there is an axial magnetic circuit and two transverse magnetic circuits between the second group of permanent magnets of the high-speed rotor, the double-modulation magnetic adjustment ring and the second group of permanent magnets of the low-speed rotor, forming a hybrid multi-magnetic circuit. Compared with the traditional topological structure, the magnetic gear provided by the present invention is less likely to cause magnetic leakage and has a higher efficiency in utilizing the magnetic field generated by the permanent magnets.

[0009] (5) The magnetic gear provided by the present invention has both axial and transverse magnetic flux paths due to the presence of a hybrid multi-magnetic circuit. This can reduce the influence of the magnetic saturation effect without reducing the total flux generated by the permanent magnet, thereby achieving the effect of anti-magnetic saturation effect, enhancing the magnetic field modulation effect, and improving the torque density of the magnetic gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Schematic diagram of the structure of the monotonic magnetic ring double and modulated double rotor axial magnetic gear in an embodiment of the present invention from a first perspective; Figure 2 Schematic diagram of the structure of the monotonic magnetic ring double and modulated double rotor axial magnetic gear in an embodiment of the present invention at a second viewing angle; Figure 3 Schematic diagram of the exploded structure of the monotonic magnetic ring double and modulated double rotor axial magnetic gear in an embodiment of the present invention; Figure 4 2 is a cross-sectional view of a monotonic magnetic ring double and modulated double rotor axial magnetic gear in an embodiment of the present invention; Figure 5 It is a structural diagram of the high-speed rotor; Figure 6 It is the structural diagram of the low-speed rotor; Figure 7 It is a structural diagram of a double-modulation magnetic tuning ring; Figure 8 This is a schematic diagram of the structure of the double-modulation magnetic ring and epoxy resin jacket; Figure 9 It is a schematic diagram of the magnetic circuit structure; Figure 10 Schematic diagram of field modulation principle; Figure 11 A comparison diagram of the magnetic field strength in the air gap between the magnetic gear of the present invention and the traditional magnetic concentrating magnetic gear; Figure 12 A comparison diagram of the spatial harmonic spectrum of magnetic induction intensity in the air gap of the magnetic gear of the present invention and the traditional magnetic concentrating magnetic gear; Figure 13 The figure is a comparison diagram of the steady-state torque output characteristics of the magnetic gear of the present invention and the traditional magnetic concentrating magnetic gear. DETAILED DESCRIPTION

[0011] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0012] See also Figures 1 to 10 The embodiment of the present invention provides a dual-rotor axial magnetic gear with a single-tone magnetic ring and a modulation magnetic ring, comprising a high-speed rotor 1, a dual-modulation magnetic ring 2, and a low-speed rotor 3, which are coaxially arranged. The dual-modulation magnetic ring 2 is nested between the high-speed rotor 1 and the low-speed rotor 3.

[0013] The double-modulation magnetic tuning ring 2 includes a plurality of magnetic tuning cores 4 . Each magnetic tuning core 4 is made of a plurality of silicon steel sheets stacked together to reduce eddy current loss. Two adjacent magnetic tuning cores 4 are separated by an epoxy resin jacket 5 .

[0014] The high-speed rotor 1 is composed of a first set of high-speed rotor permanent magnets 6 , a second set of high-speed rotor permanent magnets 7 and a high-speed rotor connecting bridge 8 . The first set of high-speed rotor permanent magnets 6 and the second set of high-speed rotor permanent magnets 7 are connected by the high-speed rotor connecting bridge 8 and rotate together.

[0015] The low-speed rotor 3 is composed of a first group of low-speed rotor permanent magnets 9, a second group of low-speed rotor permanent magnets 10 and a low-speed rotor connecting bridge 11. The first group of low-speed rotor permanent magnets 9 and the second group of low-speed rotor permanent magnets 10 are connected by the low-speed rotor connecting bridge 11 and rotate together.

[0016] Specifically, the left end surface of the double-modulation magnetic tuning ring 2 is flush with the first group of permanent magnets 6 and the second group of permanent magnets 7 of the high-speed rotor; the right end surface of the double-modulation magnetic tuning ring 2 is flush with the first group of permanent magnets 9 and the second group of permanent magnets 10 of the low-speed rotor.

[0017] A first axial air gap 12 on the high-speed rotor side is provided between the axial outer side of the first group of permanent magnets 6 of the high-speed rotor and the double-modulation magnetic tuning ring 2, a first radial air gap 13 on the high-speed rotor side is provided between the radial inner side of the first group of permanent magnets 6 of the high-speed rotor and the double-modulation magnetic tuning ring 2, a second radial air gap 14 on the high-speed rotor side is provided between the radial outer side of the first group of permanent magnets 6 of the high-speed rotor and the double-modulation magnetic tuning ring 2, a second axial air gap 15 on the high-speed rotor side is provided between the axial outer side of the second group of permanent magnets 7 of the high-speed rotor and the double-modulation magnetic tuning ring 2, a third radial air gap 16 on the high-speed rotor side is provided between the radial inner side of the second group of permanent magnets 7 of the high-speed rotor and the double-modulation magnetic tuning ring 2, and a fourth radial air gap 17 on the high-speed rotor side is provided between the radial outer side of the second group of permanent magnets 7 of the high-speed rotor and the double-modulation magnetic tuning ring 2.

[0018] A first axial air gap 18 on the low-speed rotor side is provided between the axial inner side of the first group of permanent magnets 9 of the low-speed rotor and the double-modulation magnetic tuning ring 2, a first radial air gap 19 on the low-speed rotor side is provided between the radial inner side of the first group of permanent magnets 9 of the low-speed rotor and the double-modulation magnetic tuning ring 2, a second radial air gap 20 on the low-speed rotor side is provided between the radial outer side of the first group of permanent magnets 9 of the low-speed rotor and the double-modulation magnetic tuning ring 2, a second axial air gap 21 on the low-speed rotor side is provided between the axial inner side of the second group of permanent magnets 10 of the low-speed rotor and the double-modulation magnetic tuning ring 2, a third radial air gap 22 on the low-speed rotor side is provided between the radial inner side of the second group of permanent magnets 10 of the low-speed rotor and the double-modulation magnetic tuning ring 2, and a fourth radial air gap 23 on the low-speed rotor side is provided between the radial outer side of the second group of permanent magnets 10 of the low-speed rotor and the double-modulation magnetic tuning ring 2.

[0019] The first group of permanent magnets 6 of the high-speed rotor, the second group of permanent magnets 7 of the high-speed rotor, the first group of permanent magnets 9 of the low-speed rotor, and the second group of permanent magnets 10 of the low-speed rotor all adopt a spoke structure.

[0020] The first group of high-speed rotor permanent magnets 6 includes a high-speed rotor first permanent magnet 24 and a high-speed rotor first permanent magnet pole shoe 25. The high-speed rotor first permanent magnet pole shoe 25 is embedded between two adjacent high-speed rotor first permanent magnets 24. The high-speed rotor first permanent magnet 24 and the high-speed rotor first permanent magnet pole shoe 25 support each other and perform magnetic field modulation together with the dual-modulation magnetic tuning ring 2.

[0021] The second group of high-speed rotor permanent magnets 7 includes a high-speed rotor second permanent magnet 26 and a high-speed rotor second permanent magnet pole shoe 27. The high-speed rotor second permanent magnet pole shoe 27 is embedded between two adjacent high-speed rotor second permanent magnets 26. The high-speed rotor second permanent magnet 26 and the high-speed rotor second permanent magnet pole shoe 27 support each other and perform magnetic field modulation together with the dual-modulation magnetic tuning ring 2.

[0022] The first group of permanent magnets 9 of the low-speed rotor includes the first permanent magnet 28 of the low-speed rotor and the first permanent magnet pole shoe 29 of the high-speed rotor. The first permanent magnet pole shoe 29 of the low-speed rotor is embedded between two adjacent first permanent magnets 28 of the low-speed rotor. The first permanent magnet 28 of the low-speed rotor and the first permanent magnet pole shoe 29 of the low-speed rotor support each other and perform magnetic field modulation together with the dual-modulation magnetic tuning ring 2.

[0023] The second group of permanent magnets 10 of the low-speed rotor includes the second permanent magnets 30 of the low-speed rotor and the second permanent magnet pole shoes 31 of the high-speed rotor. The second permanent magnet pole shoes 31 of the low-speed rotor are embedded between two adjacent second permanent magnets 30 of the low-speed rotor. The second permanent magnets 30 of the low-speed rotor and the second permanent magnet pole shoes 31 of the low-speed rotor support each other and perform magnetic field modulation together with the dual-modulation magnetic tuning ring 2.

[0024] The permanent magnets on the first group of permanent magnets 6 of the high-speed rotor, the second group of permanent magnets 7 of the high-speed rotor, the first group of permanent magnets 9 of the low-speed rotor, and the second group of permanent magnets 10 of the low-speed rotor are all tangentially magnetized, and the magnetization directions of the two adjacent permanent magnets in the high-speed rotor 1 are opposite, and the magnetization directions of the two adjacent permanent magnets in the low-speed rotor 3 are opposite. Figure 5 The arrow in the figure is the magnetizing direction of the permanent magnet on the high-speed rotor 1. Figure 6 The arrow in is the magnetizing direction of the permanent magnet on the low-speed rotor 3.

[0025] The magnetic field modulation mode between the first group of permanent magnets 6 of the high-speed rotor and the first group of permanent magnets 9 of the low-speed rotor adopts sum modulation to form axial sum modulation 1. The magnetic field modulation mode between the second group of permanent magnets 7 of the high-speed rotor and the second group of permanent magnets 10 of the low-speed rotor adopts sum modulation to form axial sum modulation 2. The two sum modulations share a double modulation magnetic ring to achieve a single-modulation magnetic ring double modulation effect. The field modulation principle is as follows: Figure 10 shown.

[0026] There is an axial magnetic circuit and two transverse magnetic circuits between the first set of permanent magnets 6 of the high-speed rotor, the double-modulation magnetic ring 2 and the first set of permanent magnets 9 of the low-speed rotor; there is an axial magnetic circuit and two transverse magnetic circuits between the second set of permanent magnets 7 of the high-speed rotor, the double-modulation magnetic ring 2 and the second set of permanent magnets 10 of the low-speed rotor. The above magnetic circuits together constitute a hybrid multi-magnetic circuit. The magnetic circuit structure is as follows: Figure 9 shown.

[0027] Specifically, the number of magnetic pole pairs of the permanent magnets on the first group of permanent magnets 6 of the high-speed rotor is equal to the number of magnetic pole pairs of the permanent magnets on the second group of permanent magnets 7 of the high-speed rotor; the number of magnetic pole pairs of the permanent magnets on the first group of permanent magnets 9 of the low-speed rotor is equal to the number of magnetic pole pairs of the permanent magnets on the second group of permanent magnets 10 of the low-speed rotor.

[0028] The axial length of the first set of permanent magnets 6 of the high-speed rotor is equal to the axial length of the second set of permanent magnets 7 of the high-speed rotor; the axial length of the permanent magnets on the first set of permanent magnets 9 of the low-speed rotor is equal to the axial length of the second set of permanent magnets 10 of the low-speed rotor.

[0029] The radial length of the first set of permanent magnets 6 of the high-speed rotor is equal to the radial length of the first set of permanent magnets 9 of the low-speed rotor; the radial length of the second set of permanent magnets 7 of the high-speed rotor is equal to the radial length of the second set of permanent magnets 10 of the low-speed rotor.

[0030] The thickness of the first axial air gap 12 on the high-speed rotor side is equal to the thickness of the second axial air gap 15 on the high-speed rotor side; the thickness of the first axial air gap 18 on the low-speed rotor side is equal to the thickness of the second axial air gap 21 on the low-speed rotor side; the thickness of the first radial air gap 13 on the high-speed rotor side is equal to the thickness of the first radial air gap 19 on the low-speed rotor side; the thickness of the second radial air gap 14 on the high-speed rotor side is equal to the thickness of the second radial air gap 20 on the low-speed rotor side; the thickness of the third radial air gap 16 on the high-speed rotor side is equal to the thickness of the third radial air gap 22 on the low-speed rotor side; and the thickness of the fourth radial air gap 17 on the high-speed rotor side is equal to the thickness of the fourth radial air gap 23 on the low-speed rotor side.

[0031] In this embodiment, the magnetic gear satisfies the following formula: ;

[0032] in, is the number of magnetic pole pairs of the permanent magnets on the first set of permanent magnets 6 of the high-speed rotor, is the number of magnetic tuning cores in the double modulation magnetic tuning ring 2, is the number of magnetic pole pairs of the permanent magnets on the first set of permanent magnets 9 of the low-speed rotor, is the transmission ratio between the high-speed rotor 1 and the low-speed rotor 3, is the high speed rotor speed, is the low rotor speed.

[0033] In this embodiment, the magnetic gear also satisfies the following formula: ; in, is the axial length of the double-modulation magnetic tuning ring 2, is the axial thickness of the first set of permanent magnets of the high-speed rotor, is the thickness of the first axial air gap 12 on the high-speed rotor side, is the axial thickness of the double-modulation magnetic tuning ring 2, is the thickness of the first axial air gap 18 on the low-speed rotor side, is the axial thickness of the first group of permanent magnets 9 of the low-speed rotor.

[0034] The magnetic gear also satisfies the following formula: ; in, is the radial length of the double-modulation magnetic tuning ring 2, is the radial thickness of the double-modulation magnetic tuning ring 2, is the radial length of the first set of permanent magnets 6 of the high-speed rotor, is the radial length of the second set of permanent magnets 7 of the high-speed rotor, is the thickness of the first radial air gap 13 on the high-speed rotor side, is the thickness of the second radial air gap 14 on the high-speed rotor side, is the thickness of the third radial air gap 16 on the high-speed rotor side, is the thickness of the fourth radial air gap 17 on the high-speed rotor side.

[0035] In this embodiment, the permanent magnets in the first and second sets of high-speed rotor permanent magnets 6 and 7 have six pole pairs, with a 15° interval between adjacent permanent magnets. The permanent magnets in the first and second sets of low-speed rotor permanent magnets 9 and 10 have 19 pole pairs, with a 4.74° interval between adjacent permanent magnets.

[0036] When the magnetic gear is working, the double-modulation magnetic tuning ring 2 is fixed, and external power is input by the high-speed rotor 1. The magnetic fields generated by the magnetic poles of the first group of permanent magnets 6 of the high-speed rotor and the second group of permanent magnets 7 of the high-speed rotor are modulated by the double-modulation magnetic tuning ring 2, and effective harmonics are generated in the air gap, which are coupled with the magnetic fields generated by the magnetic poles on the first group of permanent magnets 9 of the low-speed rotor and the magnetic poles on the second group of permanent magnets 10 of the low-speed rotor, thereby realizing power transmission from the high-speed rotor 1 to the low-speed rotor 3.

[0037] The magnetic gear of the present invention is compared with the traditional magnetic gear. Figure 11 It can be seen that the magnetic field intensity in the air gap of the magnetic gear of the present invention is significantly higher than that of the conventional magnetic concentrating magnetic gear of the same size, and the magnetic field modulation effect of the magnetic gear of the present invention is significantly enhanced. Figure 12 It can be seen that compared with the conventional magnetic gear of the same size, the peak value of the effective harmonic component in the air gap of the magnetic gear of the present invention is significantly improved, which is conducive to improving the torque density of the magnetic gear. Figure 13 It can be seen that the output torque of the magnetic gear provided by the present invention is significantly greater than that of a conventional magnetic gear of the same size.

[0038] An embodiment of the present invention further provides an automobile hub motor, which includes the magnetic gear described above.

[0039] In summary, the monotonic magnetic ring dual-modulation dual-rotor axial magnetic gear and automobile hub motor provided by the present invention have the following beneficial effects: (1) The magnetic field modulation method between the first group of permanent magnets of the high-speed rotor and the first group of permanent magnets of the low-speed rotor adopts sum modulation, and the magnetic field modulation method between the second group of permanent magnets of the high-speed rotor and the second group of permanent magnets of the low-speed rotor adopts sum modulation, and the two sum modulations share a double-modulation magnetic ring to achieve a single-modulation magnetic ring double-modulation effect. Compared with the traditional double-modulation magnetic ring double-modulation magnetic gear topology structure, the magnetic gear magnetic gear provided by the present invention uses less magnetic core, has a more compact structure, and is smaller in size. It has more advantages in relatively narrow space usage scenarios such as automotive hub motors; (2) The magnetic gear provided by the present invention has a stronger field modulation effect and higher torque transmission capability compared with the traditional topological structure of the same size because the magnetic gear adopts both field modulation and modulation between the first set of permanent magnets of the high-speed rotor and the first set of permanent magnets of the low-speed rotor, and between the second set of permanent magnets of the high-speed rotor and the second set of permanent magnets of the low-speed rotor. (3) The magnetic gear provided by the present invention adopts tangential magnetization for the permanent magnets on the high-speed rotor and the low-speed rotor, and pole shoes are embedded in the two adjacent permanent magnets for auxiliary modulation, so that the air gap magnetic flux density is larger, the waveform is close to the sine waveform, the torque transmission capacity is improved, and the transmission is more stable; (4) There is an axial magnetic circuit and two transverse magnetic circuits between the first group of permanent magnets of the high-speed rotor, the double-modulation magnetic adjustment ring and the first group of permanent magnets of the low-speed rotor; there is an axial magnetic circuit and two transverse magnetic circuits between the second group of permanent magnets of the high-speed rotor, the double-modulation magnetic adjustment ring and the second group of permanent magnets of the low-speed rotor, forming a hybrid multi-magnetic circuit. Compared with the traditional topological structure, the magnetic gear provided by the present invention is less likely to cause magnetic leakage and has a higher efficiency in utilizing the magnetic field generated by the permanent magnets.

[0040] (5) The magnetic gear provided by the present invention has both axial and transverse magnetic flux paths due to the presence of a hybrid multi-magnetic circuit. This can reduce the influence of the magnetic saturation effect without reducing the total flux generated by the permanent magnet, thereby achieving the effect of anti-magnetic saturation effect, enhancing the magnetic field modulation effect, and improving the torque density of the magnetic gear.

[0041] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A monotone magnetic ring double and modulated double rotor axial magnetic gear, characterized in that: It includes a high-speed rotor, a double-modulation magnetic adjustment ring, and a low-speed rotor that are coaxially arranged; the double-modulation magnetic adjustment ring is nested between the high-speed rotor and the low-speed rotor; The high-speed rotor is composed of a first group of permanent magnets of the high-speed rotor, a second group of permanent magnets of the high-speed rotor, and a high-speed rotor connecting bridge. The first group of permanent magnets of the high-speed rotor and the second group of permanent magnets of the high-speed rotor are connected by the high-speed rotor connecting bridge and rotate together. The low-speed rotor is composed of a first group of permanent magnets of the low-speed rotor, a second group of permanent magnets of the low-speed rotor, and a low-speed rotor connecting bridge. The first group of permanent magnets of the low-speed rotor and the second group of permanent magnets of the low-speed rotor are connected by the low-speed rotor connecting bridge and rotate together. The permanent magnets on the first group of permanent magnets of the high-speed rotor, the second group of permanent magnets of the high-speed rotor, the first group of permanent magnets of the low-speed rotor, and the second group of permanent magnets of the low-speed rotor are all tangentially magnetized, and the magnetization directions of two adjacent permanent magnets in the high-speed rotor are opposite, and the magnetization directions of two adjacent permanent magnets in the low-speed rotor are opposite; There is an axial magnetic circuit and two transverse magnetic circuits between the first group of permanent magnets of the high-speed rotor, the double-modulation magnetic adjustment ring and the first group of permanent magnets of the low-speed rotor; there is an axial magnetic circuit and two transverse magnetic circuits between the second group of permanent magnets of the high-speed rotor, the double-modulation magnetic adjustment ring and the second group of permanent magnets of the low-speed rotor; The magnetic field modulation mode between the first group of permanent magnets of the high-speed rotor and the first group of permanent magnets of the low-speed rotor adopts sum modulation, and the magnetic field modulation mode between the second group of permanent magnets of the high-speed rotor and the second group of permanent magnets of the low-speed rotor adopts sum modulation, and the two sum modulations share a double-modulation magnetic ring to achieve a double-modulation effect of a single-modulation magnetic ring; When the magnetic gear is working, the double-modulation magnetic tuning ring is fixed, and external power is input by the high-speed rotor. The magnetic fields generated by the poles of the first group of permanent magnets in the high-speed rotor and the second group of permanent magnets in the high-speed rotor are modulated by the double-modulation magnetic tuning ring. Effective harmonics are generated in the air gap and coupled with the magnetic fields generated by the poles of the first group of permanent magnets in the low-speed rotor and the magnetic fields generated by the poles of the second group of permanent magnets in the low-speed rotor, thereby realizing power transmission from the high-speed rotor to the low-speed rotor.

2. The monotone magnetic ring double and modulated double rotor axial magnetic gear according to claim 1, characterized in that: A first axial air gap on the high-speed rotor side is provided between the axial outer side of the first group of permanent magnets of the high-speed rotor and the double-modulation magnetic tuning ring, a first radial air gap on the high-speed rotor side is provided between the radial inner side of the first group of permanent magnets of the high-speed rotor and the double-modulation magnetic tuning ring, a second radial air gap on the high-speed rotor side is provided between the radial outer side of the first group of permanent magnets of the high-speed rotor and the double-modulation magnetic tuning ring, a second axial air gap on the high-speed rotor side is provided between the axial outer side of the second group of permanent magnets of the high-speed rotor and the double-modulation magnetic tuning ring, a third radial air gap on the high-speed rotor side is provided between the radial inner side of the second group of permanent magnets of the high-speed rotor and the double-modulation magnetic tuning ring, and a fourth radial air gap on the high-speed rotor side is provided between the radial outer side of the second group of permanent magnets of the high-speed rotor and the double-modulation magnetic tuning ring; A first axial air gap on the low-speed rotor side is provided between the axial inner side of the first group of permanent magnets of the low-speed rotor and the double-modulation magnetic tuning ring, a first radial air gap on the low-speed rotor side is provided between the radial inner side of the first group of permanent magnets of the low-speed rotor and the double-modulation magnetic tuning ring, a second radial air gap on the low-speed rotor side is provided between the radial outer side of the first group of permanent magnets of the low-speed rotor and the double-modulation magnetic tuning ring, a second axial air gap on the low-speed rotor side is provided between the axial inner side of the second group of permanent magnets of the low-speed rotor and the double-modulation magnetic tuning ring, a third radial air gap on the low-speed rotor side is provided between the radial inner side of the second group of permanent magnets of the low-speed rotor and the double-modulation magnetic tuning ring, and a fourth radial air gap on the low-speed rotor side is provided between the radial outer side of the second group of permanent magnets of the low-speed rotor and the double-modulation magnetic tuning ring.

3. The monotone magnetic ring double and modulated double rotor axial magnetic gear according to claim 2, characterized in that: The first set of permanent magnets of the high-speed rotor, the second set of permanent magnets of the high-speed rotor, the first set of permanent magnets of the low-speed rotor, and the second set of permanent magnets of the low-speed rotor all adopt a spoke structure; The first group of permanent magnets of the high-speed rotor includes a first permanent magnet of the high-speed rotor and a first permanent magnet pole shoe of the high-speed rotor. The first permanent magnet pole shoe of the high-speed rotor is embedded between two adjacent first permanent magnets of the high-speed rotor. The first permanent magnet of the high-speed rotor and the first permanent magnet pole shoe of the high-speed rotor support each other and perform magnetic field modulation together with the double modulation magnetic modulation ring. The second group of permanent magnets of the high-speed rotor includes the second permanent magnets of the high-speed rotor and the second permanent magnet pole shoes of the high-speed rotor. The second permanent magnet pole shoes of the high-speed rotor are embedded between two adjacent second permanent magnets of the high-speed rotor. The second permanent magnets of the high-speed rotor and the second permanent magnet pole shoes of the high-speed rotor support each other and perform magnetic field modulation together with the double modulation magnetic modulation ring. The first group of permanent magnets of the low-speed rotor includes a first permanent magnet of the low-speed rotor and a first permanent magnet pole shoe of the high-speed rotor. The first permanent magnet pole shoe of the low-speed rotor is embedded between two adjacent first permanent magnets of the low-speed rotor. The first permanent magnet of the low-speed rotor and the first permanent magnet pole shoe of the low-speed rotor support each other and perform magnetic field modulation together with the double-modulation magnetic modulation ring. The second group of permanent magnets of the low-speed rotor includes the second permanent magnets of the low-speed rotor and the second permanent magnet pole shoes of the high-speed rotor. The second permanent magnet pole shoes of the low-speed rotor are embedded between two adjacent second permanent magnets of the low-speed rotor. The second permanent magnets of the low-speed rotor and the second permanent magnet pole shoes of the low-speed rotor support each other and perform magnetic field modulation together with the double modulation magnetic tuning ring.

4. The monotonic magnetic ring double and modulated double rotor axial magnetic gear according to claim 3, characterized in that: The number of magnetic pole pairs of the permanent magnets on the first group of permanent magnets of the high-speed rotor is equal to the number of magnetic pole pairs of the permanent magnets on the second group of permanent magnets of the high-speed rotor; The number of magnetic pole pairs of the permanent magnets on the first group of permanent magnets of the low-speed rotor is equal to the number of magnetic pole pairs of the permanent magnets on the second group of permanent magnets of the low-speed rotor; The axial length of the first set of permanent magnets of the high-speed rotor is equal to the axial length of the second set of permanent magnets of the high-speed rotor; The axial length of the permanent magnets on the first group of permanent magnets of the low-speed rotor is equal to the axial length of the second group of permanent magnets of the low-speed rotor; The radial length of the first group of permanent magnets of the high-speed rotor is equal to the radial length of the first group of permanent magnets of the low-speed rotor; the radial length of the second group of permanent magnets of the high-speed rotor is equal to the radial length of the second group of permanent magnets of the low-speed rotor; The thickness of the first axial air gap on the high-speed rotor side is equal to the thickness of the second axial air gap on the high-speed rotor side; The thickness of the first axial air gap on the low-speed rotor side is equal to the thickness of the second axial air gap on the low-speed rotor side; the thickness of the first radial air gap on the high-speed rotor side is equal to the thickness of the first radial air gap on the low-speed rotor side; the thickness of the second radial air gap on the high-speed rotor side is equal to the thickness of the second radial air gap on the low-speed rotor side; the thickness of the third radial air gap on the high-speed rotor side is equal to the thickness of the third radial air gap on the low-speed rotor side; and the thickness of the fourth radial air gap on the high-speed rotor side is equal to the thickness of the fourth radial air gap on the low-speed rotor side.

5. The monotone magnetic ring double and modulated double rotor axial magnetic gear according to claim 4, characterized in that: The magnetic gear satisfies the following formula: ； in, is the number of magnetic pole pairs of the permanent magnets on the first set of permanent magnets of the high-speed rotor, is the number of magnetic tuning cores in the double modulation magnetic tuning ring, is the number of magnetic pole pairs of the permanent magnets on the first set of permanent magnets of the low-speed rotor, is the transmission ratio between the high-speed rotor and the low-speed rotor, is the high speed rotor speed, is the low rotor speed.

6. The monotone magnetic ring double and modulated double rotor axial magnetic gear according to claim 4, characterized in that: The magnetic gear satisfies the following formula: ； in, is the axial length of the double modulation magnetic tuning ring, is the axial thickness of the first set of permanent magnets of the high-speed rotor, is the thickness of the first axial air gap on the high-speed rotor side, is the axial thickness of the double modulation magnetic tuning ring, is the thickness of the first axial air gap on the low-speed rotor side, is the axial thickness of the first set of permanent magnets of the low-speed rotor.

7. The monotone magnetic ring double and modulated double rotor axial magnetic gear according to claim 4, characterized in that: The magnetic gear satisfies the following formula: ； in, is the radial length of the double-modulation magnetic tuning ring, is the radial thickness of the double-modulation magnetic tuning ring, is the radial length of the first set of permanent magnets of the high-speed rotor, is the radial length of the second set of permanent magnets of the high-speed rotor, is the thickness of the first radial air gap on the high-speed rotor side, is the thickness of the second radial air gap on the high-speed rotor side, is the thickness of the third radial air gap on the high-speed rotor side, is the thickness of the fourth radial air gap on the high-speed rotor side.

8. The monotone magnetic ring double and modulated double rotor axial magnetic gear according to claim 1, characterized in that: The double-modulation magnetic adjustment ring includes a plurality of magnetic adjustment cores, each of which is made of a plurality of silicon steel sheets, and two adjacent magnetic adjustment cores are separated by an epoxy resin jacket.

9. The monotone magnetic ring double and modulated double rotor axial magnetic gear according to claim 1, characterized in that: The left end surface of the double-modulation magnetic adjustment ring is flush with the first group of permanent magnets of the high-speed rotor and the second group of permanent magnets of the high-speed rotor; the right end surface of the double-modulation magnetic adjustment ring is flush with the first group of permanent magnets of the low-speed rotor and the second group of permanent magnets of the low-speed rotor.

10. An automobile hub motor, characterized in that: It includes the monotonic magnetic ring double and modulated double rotor axial magnetic gear as described in any one of claims 1 to 9.

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