Monotone magnetic ring double modulation type magnetic gear and wheel hub motor for new energy vehicles

Abstract

The present invention provides a monotonic magnetic ring double modulation type magnetic gear and a hub motor for new energy vehicles, wherein the magnetic gear comprises an inner rotor, a Z-type magnetic tuning ring stator, an intermediate rotor and an outer rotor; the inner rotor, the intermediate rotor and the Z-type magnetic tuning ring stator are coaxially nested from inside to outside in sequence to form a radially modulated coaxial magnetic gear structure, and the modulation mode is differential modulation; the intermediate rotor, the Z-type magnetic tuning ring stator and the outer rotor are coaxially nested from bottom to top in sequence to form an axially modulated coaxial magnetic gear structure, and the modulation mode is sum modulation; a radial air gap is provided between the inner rotor and the intermediate rotor, and an axial air gap is provided between the intermediate rotor and the outer rotor; the Z-type magnetic tuning ring stator comprises a plurality of Z-type magnetic tuning cores, and the intermediate rotor is used as the input rotor, and the inner rotor and the outer rotor are driven to rotate respectively through the modulation of the Z-type magnetic tuning ring stator. The present invention can solve the problems of poor magnetic field modulation effect, large device volume and low torque density of magnetic gears in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a monotone magnetic ring double-modulation type magnetic gear and a wheel hub motor for new energy vehicles. Background Art

[0002] New energy vehicles have attracted widespread attention from researchers and developers due to their zero-emission and high-energy efficiency characteristics. Among them, new energy vehicles with distributed drive systems are the development trend of new energy vehicles due to their advantages such as simple transmission structure, high transmission efficiency, and flexible vehicle control. As the core power component of the distributed drive system, the direct-drive hub motor is usually directly connected to the wheel. It not only faces the performance requirements of the vehicle power system for output torque under conditions such as acceleration and deceleration and climbing, but also needs to meet the driving requirements for stable operation under complex road conditions such as rugged mountain roads and muddy roads. Therefore, how to obtain excellent low-speed and high-torque capabilities is a focus of attention in the field of hub motor research. At the same time, the internal space of the vehicle wheel hub is small, and higher torque density is a challenging problem that needs to be solved urgently in the design process of the hub motor.

[0003] Under the influence of the magnetic core, the magnetic gear can realize bidirectional modulation of the low-speed magnetic field and the high-speed magnetic field, and then realize electromechanical energy conversion through the coupling of harmonic magnetic field. Because the inner and outer rotors are driven by modulated magnetic field coupling, and the inner and outer rotors do not contact each other during transmission, this makes the magnetic gear have the advantages of no friction vibration, no need for lubrication and maintenance, no noise, and compact structure compared to mechanical gears. It has broad application prospects in the field of field modulation hub motors for new energy vehicles.

[0004] However, existing magnetic gears still have problems such as poor magnetic field modulation effect, large device size, and low torque density of magnetic gears. Summary of the invention

[0005] The purpose of the present invention is to provide a monotonic magnetic ring double-modulation type magnetic gear and a hub motor for new energy vehicles to solve the problems of poor magnetic field modulation effect, large device volume and low torque density of the magnetic gear in the prior art.

[0006] One aspect of the present invention provides a single-tone magnetic ring double-modulation type magnetic gear, comprising an inner rotor, a Z-shaped magnetic ring stator, an intermediate rotor and an outer rotor;

[0007] The inner rotor, the intermediate rotor and the Z-shaped magnetic ring stator are coaxially nested from the inside to the outside to form a coaxial magnetic gear structure with radial modulation, and the modulation mode is differential modulation; the intermediate rotor, the Z-shaped magnetic ring stator and the outer rotor are coaxially nested from bottom to top to form a coaxial magnetic gear structure with axial modulation, and the modulation mode is sum modulation;

[0008] The permanent magnets on the inner rotor, the middle rotor, and the outer rotor are magnetized using the Halbach arrangement;

[0009] A radial air gap is provided between the inner rotor and the intermediate rotor, and an axial air gap is provided between the intermediate rotor and the outer rotor;

[0010] The Z-type magnetic adjustment ring stator includes a plurality of Z-type magnetic adjustment cores, the magnetic adjustment cores include a first radial magnetic adjustment portion, a transverse magnetic adjustment portion and a second radial magnetic adjustment portion, the transverse magnetic adjustment portion is respectively connected to the first radial magnetic adjustment portion and the second radial magnetic adjustment portion, the first radial magnetic adjustment portion is respectively connected to the inner rotor and the intermediate rotor, the second radial magnetic adjustment portion is connected to the outer rotor, the first radial magnetic adjustment portion is used to realize radial modulation of the inner rotor and the intermediate rotor, and the transverse magnetic adjustment portion is used to realize axial modulation of the intermediate rotor and the outer rotor;

[0011] The middle rotor is used as the input rotor, and is modulated by the Z-shaped magnetic regulating ring stator to drive the inner rotor and the outer rotor to rotate respectively.

[0012] Another aspect of the present invention provides a hub motor for a new energy vehicle, the hub motor comprising the above-mentioned magnetic gear.

[0013] The monotone magnetic ring double modulation type magnetic gear and the wheel hub motor for new energy vehicles provided by the present invention have the following beneficial effects:

[0014] (1) The magnetic gear realizes a three-rotor structure through an inner rotor, an intermediate rotor, and an outer rotor. Only the intermediate rotor is used as the input rotor to drive the inner rotor and the outer rotor to rotate, achieving the effect of low speed and high torque, greatly simplifying the structure of the magnetic gear and reducing the size of the device;

[0015] (2) The magnetic gear adopts a Z-type magnetic ring stator. This design can realize the magnetic field difference modulation between the permanent magnets on the intermediate rotor and the inner rotor, and can also realize the magnetic field sum modulation between the permanent magnets on the intermediate rotor and the outer rotor, thereby realizing the effect of sum and difference composite double modulation, effectively enhancing the modulation effect of the magnetic field. Compared with the traditional magnetic gear using double magnetic rings for double modulation, the magnetic gear of the present invention is simplified in structure, improves the torque capacity, and increases the torque density of the magnetic gear;

[0016] (3) The permanent magnets on the inner rotor, the middle rotor and the outer rotor are magnetized using the Halbach arrangement method. The first inner permanent magnet with a smaller volume on the inner rotor is arranged on the inner ring of the inner rotor, the first middle permanent magnet with a smaller volume on the middle rotor is arranged on the outer ring of the middle rotor, and the first outer permanent magnet with a smaller volume on the outer rotor is arranged on the inner ring of the inner rotor. This design can effectively reduce the end leakage of the permanent magnet rotor and improve the air gap magnetic field harmonics. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the overall structure of a monotone magnetic ring double modulation type magnetic gear in an embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the side structure of a monotone magnetic ring double modulation type magnetic gear in an embodiment of the present invention;

[0019] Figure 3 An exploded view of a monotone magnetic ring double modulation type magnetic gear in an embodiment of the present invention;

[0020] Figure 4 A three-dimensional cross-sectional view of a monotone magnetic ring double modulation type magnetic gear in an embodiment of the present invention;

[0021] Figure 5 It is a schematic diagram of the structure of the Z-type magnetic regulating ring stator;

[0022] Figure 6 It is a front structural schematic diagram of a monotone magnetic ring double modulation type magnetic gear in an embodiment of the present invention;

[0023] Figure 7 is a schematic diagram of the structure of the intermediate rotor;

[0024] Figure 8 is a schematic diagram of the structure of the outer rotor;

[0025] Fig. 9 A comparison diagram of the magnetic field strength in the air gap between the magnetic gear of the present invention and the conventional magnetic concentrating magnetic gear;

[0026] Fig.10 It is a comparison diagram of the spatial harmonic spectrum of the magnetic induction intensity in the air gap of the magnetic gear of the present invention and the traditional magnetic concentrating magnetic gear. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0028] See also Figures 1 to 8 The monotonic magnetic ring double modulation type magnetic gear provided in an embodiment of the present invention includes an inner rotor 1, an intermediate rotor 2, a Z-type magnetic modulation ring stator 3, and an outer rotor 4.

[0029] The inner rotor 1, the intermediate rotor 2 and the Z-type magnetic modulation ring stator 3 are coaxially nested in sequence from the inside to the outside to form a radially modulated coaxial magnetic gear structure, and the modulation method is differential modulation.

[0030] The intermediate rotor 2, the Z-shaped magnetic regulating ring stator 3 and the outer rotor 4 are coaxially nested in sequence from bottom to top to form an axially modulated coaxial magnetic gear structure, and the modulation mode is sum modulation.

[0031] The permanent magnets on the inner rotor 1, the intermediate rotor 2 and the outer rotor 4 are magnetized using the Halbach arrangement.

[0032] A radial air gap 11 is provided between the inner rotor 1 and the intermediate rotor 2 , and an axial air gap 16 is provided between the intermediate rotor 2 and the outer rotor 4 .

[0033] The Z-shaped magnetic tuning ring stator 3 includes a plurality of Z-shaped magnetic tuning cores. In this embodiment, the number of the magnetic tuning cores is 23, and the interval angle between two adjacent magnetic tuning cores is 7.83°.

[0034] The Z-type magnetic modulation ring stator 3 has a dual modulation performance, which can modulate both the radial magnetic field and the axial magnetic field, and can effectively enhance the magnetic field modulation effect, reduce permanent magnet leakage and suppress magnetic saturation effect.

[0035] Specifically, the magnetizing core includes a first radial magnetizing portion 51, a transverse magnetizing portion 52 and a second radial magnetizing portion 53. The transverse magnetizing portion 52 is connected to the first radial magnetizing portion 51 and the second radial magnetizing portion 53 respectively. The first radial magnetizing portion 51 is connected to the inner rotor 1 and the intermediate rotor 2 respectively, and the second radial magnetizing portion 53 is connected to the outer rotor 4. The first radial magnetizing portion 51 is used to realize radial modulation of the inner rotor 1 and the intermediate rotor 2, the transverse magnetizing portion 52 is used to realize axial modulation of the intermediate rotor 2 and the outer rotor 4, and the second radial magnetizing portion 53 is used to suppress magnetic leakage of the outer rotor.

[0036] The intermediate rotor 2 is used as the input rotor, and after modulation by the Z-type magnetic ring stator 3, the inner rotor 1 and the outer rotor 4 are driven to rotate. Specifically, the magnetic gear has two motion modes, one is that the intermediate rotor 2 is used as the input to drive the inner rotor 1 to rotate to transmit torque; the other is that the intermediate rotor 2 is used as the input to drive the outer rotor 4 to rotate to transmit torque. The three-rotor structure is realized by the inner rotor, the intermediate rotor, and the outer rotor, forming a low-speed and high-torque magnetic gear structure.

[0037] In this embodiment, the number of Z-shaped magnetic adjustment ring stator upper magnetic cores P Z , the number of pole pairs of the permanent magnets on the inner rotor P 1 , the number of pole pairs of permanent magnets on the intermediate rotor P 2 , the number of pole pairs of the permanent magnets on the outer rotor P 3 The following conditions are met:

[0038] P Z = P 1 - P 2 ;

[0039] P Z = P 2 - P 3 .

[0040] Among them, the conditional formula is satisfied: P Z = P 1 - P 2 , so that the inner rotor 1, the intermediate rotor 2 and the Z-type magnetic modulation ring stator 3 constitute a radially modulated coaxial magnetic gear structure.

[0041] Satisfy the conditions: P Z = P 2 - P 3 , so that the intermediate rotor 2, the Z-type magnetic modulation ring stator 3 and the outer rotor 4 constitute an axially modulated coaxial magnetic gear structure.

[0042] In this embodiment, the magnetic gear satisfies the following conditional formula:

[0043] ;

[0044] ;

[0045] in, It represents the transmission ratio between the inner rotor and the intermediate rotor. It represents the transmission ratio between the outer rotor and the intermediate rotor. Indicates the speed of the inner rotor, represents the speed of the intermediate rotor, Indicates the speed of the outer rotor.

[0046] The inner rotor 1 includes a plurality of cohesive magnetic cores 12, a plurality of first inner permanent magnets 13 and a plurality of second inner permanent magnets 14. The volume of the second inner permanent magnets 14 is greater than that of the first inner permanent magnets 13. The first inner permanent magnets 13 are arranged in the inner ring of the inner rotor 1. The magnetization method of the first inner permanent magnets 13 is tangential magnetization. The cohesive magnetic cores 12 are arranged in the outer ring of the inner rotor 1. The magnetization method of the second inner permanent magnets 14 is radial magnetization. The number of the cohesive magnetic cores 12, the first inner permanent magnets 13 and the second inner permanent magnets 14 is the same. In this embodiment, the number of the cohesive magnetic cores 12, the first inner permanent magnets 13 and the second inner permanent magnets 14 is 54. The first inner permanent magnets 13 are connected to the cohesive magnetic cores 12. A first inner permanent magnet 13 and a cohesive magnetic core 12 are sandwiched between any two adjacent second inner permanent magnets 14.

[0047] Please refer to Figure 7 , Figure 7 The arrow in indicates the magnetization direction. The intermediate rotor 2 includes a plurality of intermediate magnet cores 9, a plurality of first intermediate permanent magnets 8 and a plurality of second intermediate permanent magnets 10. The volume of the second intermediate permanent magnets 10 is greater than that of the first intermediate permanent magnets 8. The intermediate magnet cores 9 are arranged in the inner ring of the intermediate rotor 2, and the first intermediate permanent magnets 8 are arranged in the outer ring of the intermediate rotor 2. The magnetization method of the first intermediate permanent magnets 8 is tangential magnetization, and the magnetization method of the second intermediate permanent magnets 10 is radial magnetization. The number of the intermediate magnet cores 9, the first intermediate permanent magnets 8 and the second intermediate permanent magnets 10 is the same. In this embodiment, the number of the intermediate magnet cores 9, the first intermediate permanent magnets 8 and the second intermediate permanent magnets 10 is 8. The first intermediate permanent magnets 8 are connected to the intermediate magnet cores 9, and a first intermediate permanent magnet 8 and an intermediate magnet core 9 are sandwiched between any two adjacent second intermediate permanent magnets 10. This design can reduce the end leakage of the permanent magnets of the intermediate rotor and improve the air gap magnetic field harmonics. In this embodiment, the intermediate rotor adopts the Halbach magnetization method of not all permanent magnetic materials. Specifically, the intermediate magnetic core 9 adopts non-permanent magnetic materials, and the first intermediate permanent magnet 8 and the second intermediate permanent magnet 10 adopt permanent magnetic materials.

[0048] Please refer to Figure 8 , Figure 8The arrow in indicates the magnetization direction. The outer rotor 4 includes a plurality of outer focusing magnetic cores 17, a plurality of first outer permanent magnets 18 and a plurality of second outer permanent magnets 19. The volume of the second outer permanent magnets 19 is greater than that of the first outer permanent magnets 18. The first outer permanent magnets 18 are arranged on the inner ring of the outer rotor 4. The magnetization method of the first outer permanent magnets 18 is radial magnetization. The outer focusing magnetic cores 17 are arranged on the outer ring of the outer rotor 4. The magnetization method of the second outer permanent magnets 19 is tangential magnetization. The number of the outer focusing magnetic cores 17, the first outer permanent magnets 18 and the second outer permanent magnets 19 is the same. In this embodiment, the number of the outer focusing magnetic cores 17, the first outer permanent magnets 18 and the second outer permanent magnets 19 is 38. The first outer permanent magnet 18 is connected to the outer focusing magnetic core 17. A first outer permanent magnet 18 and an outer focusing magnetic core 17 are sandwiched between any two adjacent second outer permanent magnets 19. This design can reduce the end leakage of the outer rotor permanent magnets and improve the air gap magnetic field harmonics. In this embodiment, the outer rotor 4 adopts the Halbach magnetization method of not all permanent magnetic materials. Specifically, the outer focusing core 17 adopts non-permanent magnetic materials, and the first outer permanent magnet 18 and the second outer permanent magnet 19 adopt permanent magnetic materials.

[0049] The magnetic gear of the present invention is compared and analyzed with the traditional magnetic gear. Fig. 9 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 traditional magnetic gear, and the magnetic field modulation effect of the magnetic gear of the present invention is significantly enhanced. Fig.10 It can be seen that compared with the traditional magnetic gear with concentrated magnetic flux, 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 beneficial to improving the torque density of the magnetic gear.

[0050] An embodiment of the present invention further provides a hub motor for a new energy vehicle, wherein the hub motor comprises the magnetic gear described above.

[0051] In summary, the monotone magnetic ring double modulation type magnetic gear and the wheel hub motor for new energy vehicles provided by the present invention have the following beneficial effects:

[0052] (1) The magnetic gear realizes a three-rotor structure through an inner rotor, an intermediate rotor, and an outer rotor. Only the intermediate rotor is used as the input rotor to drive the inner rotor and the outer rotor to rotate, achieving the effect of low speed and high torque, greatly simplifying the structure of the magnetic gear and reducing the size of the device;

[0053] (2) The magnetic gear adopts a Z-type magnetic ring stator. This design can realize the magnetic field difference modulation between the permanent magnets on the intermediate rotor and the inner rotor, and can also realize the magnetic field sum modulation between the permanent magnets on the intermediate rotor and the outer rotor, thereby realizing the effect of sum and difference composite double modulation, effectively enhancing the modulation effect of the magnetic field. Compared with the traditional magnetic gear using double magnetic rings for double modulation, the magnetic gear of the present invention is simplified in structure, improves the torque capacity, and increases the torque density of the magnetic gear;

[0054] (3) The permanent magnets on the inner rotor, the middle rotor and the outer rotor are magnetized using the Halbach arrangement method. The first inner permanent magnet with a smaller volume on the inner rotor is arranged on the inner ring of the inner rotor, the first middle permanent magnet with a smaller volume on the middle rotor is arranged on the outer ring of the middle rotor, and the first outer permanent magnet with a smaller volume on the outer rotor is arranged on the inner ring of the inner rotor. This design can effectively reduce the end leakage of the permanent magnet rotor and improve the air gap magnetic field harmonics.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] Although the 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 present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A monotone magnetic ring double modulation type magnetic gear, characterized in that: It includes an inner rotor, a Z-shaped magnetic ring stator, an intermediate rotor and an outer rotor; The inner rotor, the Z-shaped magnetic ring stator and the intermediate rotor are coaxially nested from inside to outside to form a coaxial magnetic gear structure with radial modulation, and the modulation mode is differential modulation; the intermediate rotor, the Z-shaped magnetic ring stator and the outer rotor are coaxially nested from bottom to top to form a coaxial magnetic gear structure with axial modulation, and the modulation mode is sum modulation; The permanent magnets on the inner rotor, the middle rotor, and the outer rotor are magnetized using the Halbach arrangement; A radial air gap is provided between the inner rotor and the intermediate rotor, and an axial air gap is provided between the intermediate rotor and the outer rotor; The Z-type magnetic adjustment ring stator includes a plurality of Z-type magnetic adjustment cores, the magnetic adjustment cores include a first radial magnetic adjustment portion, a transverse magnetic adjustment portion and a second radial magnetic adjustment portion, the transverse magnetic adjustment portion is respectively connected to the first radial magnetic adjustment portion and the second radial magnetic adjustment portion, the first radial magnetic adjustment portion is respectively connected to the inner rotor and the intermediate rotor, the second radial magnetic adjustment portion is connected to the outer rotor, the first radial magnetic adjustment portion is used to realize radial modulation of the inner rotor and the intermediate rotor, and the transverse magnetic adjustment portion is used to realize axial modulation of the intermediate rotor and the outer rotor; The middle rotor is used as the input rotor, and is modulated by the Z-shaped magnetic regulating ring stator to drive the inner rotor and the outer rotor to rotate respectively.

2. The monotone magnetic ring double modulation type magnetic gear according to claim 1, characterized in that: The number of magnetic cores on the Z-type magnetic ring stator P Z , the number of pole pairs of the permanent magnets on the inner rotor P 1. Number of pole pairs of permanent magnets on the intermediate rotor P 2. Number of pole pairs of permanent magnets on the outer rotor P 3 satisfies the following conditions: P Z = P 1- P 2； P Z = P 2- P 3。 3. The monotone magnetic ring double modulation type magnetic gear according to claim 2, characterized in that: The magnetic gear satisfies the following conditional formula: ； ； in, Indicates the transmission ratio between the inner rotor and the intermediate rotor, It represents the transmission ratio between the outer rotor and the intermediate rotor. Indicates the speed of the inner rotor, represents the speed of the intermediate rotor, Indicates the speed of the outer rotor.

4. The monotone magnetic ring double modulation type magnetic gear according to claim 1, characterized in that: The inner rotor includes multiple cohesive magnetic cores, multiple first inner permanent magnets and multiple second inner permanent magnets. The volume of the second inner permanent magnets is larger than that of the first inner permanent magnets. The first inner permanent magnets are arranged on the inner ring of the inner rotor. The magnetization method of the first inner permanent magnets is tangential magnetization. The cohesive magnetic cores are arranged on the outer ring of the inner rotor. The magnetization method of the second inner permanent magnets is radial magnetization. The number of the cohesive magnetic cores, the first inner permanent magnets and the second inner permanent magnets is the same. The first inner permanent magnets are connected to the cohesive magnetic cores. A first inner permanent magnet and a cohesive magnetic core are sandwiched between any two adjacent second inner permanent magnets.

5. The monotone magnetic ring double modulation type magnetic gear according to claim 1, characterized in that: The intermediate rotor includes multiple intermediate magnetic cores, multiple first intermediate permanent magnets and multiple second intermediate permanent magnets. The volume of the second intermediate permanent magnets is larger than that of the first intermediate permanent magnets. The intermediate magnetic core is arranged on the inner ring of the intermediate rotor, and the first intermediate permanent magnets are arranged on the outer ring of the intermediate rotor. The magnetization method of the first intermediate permanent magnets is tangential magnetization, and the magnetization method of the second intermediate permanent magnets is radial magnetization. The number of intermediate magnetic cores, first intermediate permanent magnets and second intermediate permanent magnets is the same. The first intermediate permanent magnets are connected to the intermediate magnetic core. A first intermediate permanent magnet and an intermediate magnetic core are sandwiched between any two adjacent second intermediate permanent magnets. The intermediate magnetic core is made of non-permanent magnetic material, and the first intermediate permanent magnets and the second intermediate permanent magnets are made of permanent magnetic material.

6. The monotone magnetic ring double modulation type magnetic gear according to claim 1, characterized in that: The outer rotor includes multiple outer cohesive magnetic cores, multiple first outer permanent magnets and multiple second outer permanent magnets. The volume of the second outer permanent magnets is larger than that of the first outer permanent magnets. The first outer permanent magnets are arranged on the inner ring of the outer rotor. The magnetization method of the first outer permanent magnets is radial magnetization. The outer cohesive magnetic core is arranged on the outer ring of the outer rotor. The magnetization method of the second outer permanent magnets is tangential magnetization. The number of the outer cohesive magnetic cores, the first outer permanent magnets and the second outer permanent magnets is the same. The first outer permanent magnets are connected to the outer cohesive magnetic cores. A first outer permanent magnet and an outer cohesive magnetic core are sandwiched between any two adjacent second outer permanent magnets. The outer cohesive magnetic cores are made of non-permanent magnetic materials, and the first outer permanent magnets and the second outer permanent magnets are made of permanent magnetic materials.

7. The monotone magnetic ring double modulation type magnetic gear according to claim 4, characterized in that: The number of the inner cohesive magnetic core, the first inner permanent magnet, and the second inner permanent magnet is 54 each.

8. The monotone magnetic ring double modulation type magnetic gear according to claim 5, characterized in that: The number of the middle magnetic core, the first middle permanent magnet, and the second middle permanent magnet is 8 each.

9. The monotone magnetic ring double modulation type magnetic gear according to claim 6, characterized in that: The number of the outer coherent magnetic core, the first outer permanent magnet, and the second outer permanent magnet is 38 each.

10. A hub motor for a new energy vehicle, characterized in that: A monotone magnetic ring double modulation type magnetic gear comprising the monotone magnetic ring as described in any one of claims 1 to 9.

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