Multi-magnetic circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear and automobile wheel hub motor

Abstract

This invention provides a multi-magnetic-circuit single-modulation magnetic ring dual-modulation three-rotor coaxial magnetic gear and an automotive hub motor. The magnetic gear includes an inner rotor, a T-shaped dual-modulation magnetic ring, a middle rotor, and an outer rotor. The inner rotor, T-shaped dual-modulation magnetic ring, and middle rotor are nested sequentially and coaxially, forming a radially modulated coaxial magnetic gear structure. The middle rotor, T-shaped dual-modulation magnetic ring, and outer rotor are also nested sequentially and coaxially, forming an axially modulated coaxial magnetic gear structure. Modulation is used between the inner rotor and the middle rotor, and between the middle rotor and the outer rotor. Both modulations share a single T-shaped dual-modulation magnetic ring, achieving a single-modulation magnetic ring dual-modulation effect. This invention can reduce the size of the magnetic gear, improve its torque transmission capacity, suppress magnetic saturation, enhance the magnetic field modulation effect, and increase the torque density of the magnetic gear.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, and in particular to a multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear and an automobile wheel hub motor. Background Technology

[0002] New energy vehicles have garnered widespread attention from researchers due to their zero emissions and high energy efficiency. Among them, new energy vehicles with distributed drive systems represent a development trend due to their advantages such as 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 directly connected to the wheels. They not only face the performance requirements of the vehicle's power system for output torque under acceleration, deceleration, and hill climbing conditions, but also need to meet the drive requirements for stable operation under complex road conditions such as rugged mountain roads and muddy roads. Therefore, how to obtain excellent low-speed, high-torque capability is a key focus in the field of in-wheel motor research. Simultaneously, the limited internal space of the vehicle wheel hub makes achieving higher torque density a challenging problem that urgently needs to be solved in the design of in-wheel motors.

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

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

[0005] The purpose of this invention is to provide a multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear and an automobile wheel hub motor, so as to reduce the size of the magnetic gear, 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 multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear, comprising an inner rotor, a T-type dual-modulation magnetic ring, an intermediate rotor, and an outer rotor.

[0007] The inner rotor, the T-type double-modulation magnetic ring, and the intermediate rotor are nested in sequence and coaxially configured to form a radial and modulated coaxial magnetic gear structure; the intermediate rotor, the T-type double-modulation magnetic ring, and the outer rotor are nested in sequence and coaxially configured to form an axial and modulated coaxial magnetic gear structure.

[0008] The inner rotor and the middle rotor are modulated by a combination of modulation and modulation, and the middle rotor and the outer rotor are modulated by a combination of modulation and modulation. The two modulations share a T-shaped dual-modulation magnetic ring to achieve the dual-modulation effect of the monotonic magnetic ring.

[0009] The inner rotor, intermediate rotor, and outer rotor are magnetized tangentially, and the magnetization directions of two adjacent permanent magnets in the inner rotor are opposite, the magnetization directions of two adjacent permanent magnets in the intermediate rotor are opposite, and the magnetization directions of two adjacent permanent magnets in the outer rotor are opposite.

[0010] There is a radial magnetic circuit between the inner rotor and the middle rotor, and there is an axial magnetic circuit and a transverse magnetic circuit between the middle rotor and the outer rotor;

[0011] When the magnetic gear is working, the T-type double modulation magnetic ring is fixed, and the middle rotor, as the input rotor, drives the inner rotor and the outer rotor to rotate through the modulation effect of the T-type double modulation magnetic ring.

[0012] Another aspect of the present invention provides an automotive wheel hub motor, which includes the aforementioned magnetic gear.

[0013] The multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear and automobile wheel hub motor provided by the present invention have the following beneficial effects:

[0014] (1) The magnetic gear of the present invention shares a T-shaped double modulation magnetic ring for radial and axial modulation, which reduces the number of magnetic blocks. Compared with the traditional double modulation magnetic ring magnetic gear topology, the structure of the present invention is more compact and smaller in size, which is more advantageous in application scenarios with relatively small space, such as automobile wheel hub motors.

[0015] (2) The magnetic gear of the present invention employs field modulation in both the radial and axial directions and has two power output ports. Compared with the traditional topology, the magnetic gear of the present invention has a stronger field modulation effect and a higher torque transmission capability, while the torque density is significantly improved.

[0016] (3) The magnetic gear provided by the present invention uses tangential magnetization on the permanent magnets on the high-speed rotor and the low-speed rotor, and has pole shoes embedded in the two adjacent permanent magnets for auxiliary modulation, which makes the air gap magnetic flux density greater, the waveform is close to a sine waveform, the torque transmission capability is improved, and the transmission is more stable.

[0017] (4) The magnetic gear of the present invention adopts a structure with three rotors arranged in a coaxial manner and a transmission form in which the middle rotor drives the inner rotor and the outer rotor to rotate respectively. Compared with the traditional dual-rotor coaxial magnetic gear, the magnetic gear of the present invention can achieve the transmission effect of the middle rotor input and the inner rotor and the outer rotor output at the same time.

[0018] (5) The magnetic gear provided by the present invention has a radial magnetic circuit between the inner rotor and the middle rotor, and an axial magnetic circuit and a transverse magnetic circuit between the middle rotor and the outer rotor, forming a hybrid multi-magnetic circuit. Compared with the traditional topology, the magnetic gear provided by the present invention is less prone to magnetic leakage and has a higher utilization efficiency of the magnetic field generated by the permanent magnet.

[0019] (6) The magnetic gear provided by the present invention has a hybrid multi-magnetic circuit, which simultaneously has three magnetic flux paths: axial, radial and transverse. It can reduce the influence of magnetic saturation effect without reducing the total flux generated by the permanent magnet, thus achieving the effect of resisting magnetic saturation effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear in an embodiment of the present invention from a first perspective.

[0021] Figure 2 This is a schematic diagram of the multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear structure in an embodiment of the present invention from a second perspective.

[0022] Figure 3 This is an exploded view of the multi-magnetic-circuit monotonic magnetic ring double-modulation three-rotor coaxial magnetic gear in an embodiment of the present invention;

[0023] Figure 4 This is a cross-sectional view of the inner rotor and the intermediate rotor.

[0024] Figure 5 This is a cross-sectional view of the inner and outer rotors.

[0025] Figure 6 This is a schematic diagram of the T-type dual-modulation tuning ring.

[0026] Figure 7 A schematic diagram of the structure of the T-type dual-modulation magnetic ring and epoxy resin jacket;

[0027] Figure 8 This is a schematic diagram of the magnetic circuit structure of the multi-magnetic-circuit monotonic magnetic ring double-modulation three-rotor coaxial magnetic gear in an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the modulation principle of the multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear in an embodiment of the present invention;

[0029] Figure 10 This is a comparison diagram of the magnetic field strength in the air gap between the magnetic gear of the present invention and the conventional magnetic gear with a magnetic field of concentrated magnetization.

[0030] Figure 11This is 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 that of the conventional magnetic gear with a magnetically concentrated magnet.

[0031] Figure 12 This is a comparison diagram of the steady-state torque output characteristics of the magnetic gear of the present invention and the traditional magnetic gear with a magnetic field. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1 to 9 The multi-magnetic-circuit mono-modulation magnetic ring dual-modulation three-rotor coaxial magnetic gear provided in this embodiment of the invention includes an inner rotor 1, a T-type dual-modulation magnetic ring 2, an intermediate-speed rotor 3, and an outer rotor 4.

[0034] The inner rotor 1, the T-type double modulation magnetic ring 2, and the intermediate rotor 3 are nested from the inside out and coaxially configured to form a coaxial magnetic gear structure for radial and modulation purposes; the intermediate rotor 3, the T-type double modulation magnetic ring 2, and the outer rotor 4 are nested from the left to the right and coaxially configured to form a coaxial magnetic gear structure for axial and modulation purposes.

[0035] Specifically, the inner end face of the inner rotor 1 and the inner end face of the middle rotor 3 are flush with the left end face of the T-type double modulation magnetic ring 2. The outer end face of the outer rotor 4 is flush with the right end face of the T-type double modulation magnetic ring 2.

[0036] The T-type dual-modulation magnetic ring 2 includes multiple magnetic cores 5, each magnetic core 5 is made of multiple silicon steel sheets stacked together to reduce eddy current losses, and adjacent magnetic cores are separated by epoxy resin jackets 6.

[0037] A radial air gap 7 is provided between the radially outer side of the inner rotor 1 and the radially inner side of the T-type double-modulation magnetic ring 2. A radial air gap 8 is provided between the radially inner side of the intermediate rotor 3 and the radially outer side of the T-type double-modulation magnetic ring 2. An axial air gap 9 is provided between the axially outer side of the intermediate rotor 3 and the axially inner side of the T-type double-modulation magnetic ring 2. A radial air gap 10 is provided between the radially inner side of the outer rotor 4 and the radially outer side of the T-type double-modulation magnetic ring 2. An axial air gap 11 is provided between the axially inner side of the outer rotor 4 and the axially outer side of the T-type double-modulation magnetic ring 2.

[0038] The thickness of the radial air gap 8 on the intermediate rotor side is equal to the thickness of the radial air gap 10 on the outer rotor side. The axial thickness of the inner rotor 1 is equal to the axial thickness of the intermediate rotor 3. The radial thickness of the intermediate rotor 3 is equal to the radial thickness of the outer rotor 4.

[0039] The magnetic gear satisfies the following formula:

[0040] ;

[0041] in, The radial length of the T-type double-modulation tuning ring. The radial thickness of the T-type double-modulation tuning ring. The thickness of the radial air gap on the middle rotor side. The radial thickness of the intermediate rotor.

[0042] The magnetic gear also satisfies the following formula:

[0043] ;

[0044] in, This refers to the axial length of the T-type double-modulation tuning ring. The axial thickness is the T-type double-modulation magnetic ring. This represents the axial thickness of the inner rotor. The axial thickness of the outer rotor. The thickness of the axial air gap on the middle rotor side. The thickness of the axial air gap on the outer rotor side.

[0045] The inner rotor 1, the intermediate rotor 3 and the outer rotor 4 adopt a spoke structure.

[0046] Specifically, the inner rotor 1 includes an inner rotor permanent magnet 12 and an inner rotor pole shoe 13. The inner rotor pole shoe 13 is embedded between two adjacent inner rotor permanent magnets 12. The inner rotor pole shoe 13 and the inner rotor permanent magnet 12 support each other and work together with the T-shaped double modulation tuning ring 2 to modulate the magnetic field.

[0047] The intermediate rotor 3 includes an intermediate rotor permanent magnet 14 and an intermediate rotor pole shoe 15. The intermediate rotor pole shoe 15 is embedded between two adjacent intermediate rotor permanent magnets 14. The intermediate rotor pole shoe 15 and the intermediate rotor permanent magnet 14 support each other and work together with the T-shaped double modulation tuning ring 2 to modulate the magnetic field.

[0048] The outer rotor 4 includes an outer rotor permanent magnet 16 and an outer rotor pole shoe 17. The outer rotor pole shoe 17 is embedded between two adjacent outer rotor permanent magnets 16. The outer rotor pole shoe 17 and the outer rotor permanent magnet 16 support each other and work together with the T-type double modulation tuning ring 2 to modulate the magnetic field.

[0049] The permanent magnets on the inner rotor 1, intermediate rotor 3, and outer rotor 4 are all tangentially magnetized. Furthermore, the magnetization directions of adjacent permanent magnets in the inner rotor 1, the intermediate rotor 3, and the outer rotor 4 are opposite. Figure 4 and Figure 5 The arrows in the diagram indicate the direction of magnetization of the permanent magnet.

[0050] The inner rotor 1 and the intermediate rotor 3 are modulated using a sum-modulation method, as are the intermediate rotor 3 and the outer rotor 4. Both sum-modulation methods share a single T-shaped dual-modulation magnetic ring 2, achieving a monotonic magnetic ring dual-modulation effect. The field modulation principle is as follows: Figure 9 As shown.

[0051] There is a radial magnetic circuit between the inner rotor 1 and the intermediate rotor 3, and an axial magnetic circuit and a transverse magnetic circuit between the intermediate rotor 3 and the outer rotor 4. These magnetic circuits together constitute a hybrid multi-magnetic circuit, the structure of which is as follows: Figure 8 As shown, this hybrid multi-magnetic circuit effectively reduces magnetic leakage, enhances the magnetic field modulation effect, and increases the torque density of the magnetic gear.

[0052] The magnetic gear also satisfies the following formula:

[0053]

[0054]

[0055] in, The number of tuning magnet cores for the T-type double-modulation tuning ring. Let be the number of pole pairs of the permanent magnets on the inner rotor. This represents the number of pole pairs of the permanent magnets on the intermediate rotor. denoted as the number of pole pairs of the permanent magnets on the outer rotor.

[0056] In this embodiment, the number of pole pairs of the permanent magnets on the inner rotor 1 is equal to the number of pole pairs of the permanent magnets on the outer rotor 4. The total number of pole pairs of the permanent magnets on the inner rotor 1 and the outer rotor 4 is 17, and the interval between two adjacent permanent magnets is 5.29°. The number of pole pairs of the permanent magnets on the intermediate rotor 3 is 4, and the interval between two adjacent permanent magnets is 22.5°.

[0057] The magnetic gear also satisfies the following formula:

[0058]

[0059]

[0060] in, This is for the transmission between the intermediate rotor and the inner rotor. This refers to the transmission ratio between the intermediate rotor and the outer rotor. The internal rotor speed, The intermediate rotor speed. This represents the rotational speed of the external rotor.

[0061] When the magnetic gear is working, the T-type double modulation magnetic ring 2 is fixed, and the middle rotor 3 serves as the input rotor. Through the modulation effect of the T-type double modulation magnetic ring 2, it drives the inner rotor 1 and the outer rotor 4 to rotate respectively; and the inner rotor 1 and the outer rotor 4 have the same speed.

[0062] A comparative analysis of the magnetic gear of this invention with that of a traditional magnetic gear with concentrated magnets was conducted. Figure 10 It can be seen that the magnetic field strength in the air gap of the magnetic gear of the present invention is significantly higher than that of a conventional magnetic gear of the same size, and the magnetic field modulation effect of the magnetic gear of the present invention is significantly enhanced. Figure 11 It can be seen that, compared with traditional magnetic gears of the same size, the peak value of the effective harmonic components in the air gap of the magnetic gear of this invention is significantly improved, which is beneficial to improving the torque density of the magnetic gear. From Figure 12 It can be seen that the output torque of the magnetic gear of the present invention is significantly greater than that of the conventional magnetic gear of the same size.

[0063] An embodiment of the present invention also provides an automotive hub motor, which includes the aforementioned magnetic gear.

[0064] In summary, the multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear and automobile wheel hub motor provided by the present invention have the following beneficial effects:

[0065] (1) The magnetic gear of the present invention shares a T-shaped double modulation magnetic ring for radial and axial modulation, which reduces the number of magnetic blocks. Compared with the traditional double modulation magnetic ring magnetic gear topology, the structure of the present invention is more compact and smaller in size, which is more advantageous in application scenarios with relatively small space, such as automobile wheel hub motors.

[0066] (2) The magnetic gear of the present invention employs field modulation in both the radial and axial directions and has two power output ports. Compared with the traditional topology, the magnetic gear of the present invention has a stronger field modulation effect and a higher torque transmission capability, while the torque density is significantly improved.

[0067] (3) The magnetic gear provided by the present invention uses tangential magnetization on the permanent magnets on the high-speed rotor and the low-speed rotor, and has pole shoes embedded in the two adjacent permanent magnets for auxiliary modulation, which makes the air gap magnetic flux density greater, the waveform is close to a sine waveform, the torque transmission capability is improved, and the transmission is more stable.

[0068] (4) The magnetic gear of the present invention adopts a structure with three rotors arranged in a coaxial manner and a transmission form in which the middle rotor drives the inner rotor and the outer rotor to rotate respectively. Compared with the traditional dual-rotor coaxial magnetic gear, the magnetic gear of the present invention can achieve the transmission effect of the middle rotor input and the inner rotor and the outer rotor output at the same time.

[0069] (5) The magnetic gear provided by the present invention has a radial magnetic circuit between the inner rotor and the middle rotor, and an axial magnetic circuit and a transverse magnetic circuit between the middle rotor and the outer rotor, forming a hybrid multi-magnetic circuit. Compared with the traditional topology, the magnetic gear provided by the present invention is less prone to magnetic leakage and has a higher utilization efficiency of the magnetic field generated by the permanent magnet.

[0070] (6) The magnetic gear provided by the present invention has a hybrid multi-magnetic circuit, which simultaneously has three magnetic flux paths: axial, radial and transverse. It can reduce the influence of magnetic saturation effect without reducing the total flux generated by the permanent magnet, thus achieving the effect of resisting magnetic saturation effect.

[0071] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate 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 invention. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0072] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A multi-magnetic-circuit monotonic magnetic ring double-modulation three-rotor coaxial magnetic gear, characterized in that, It includes an inner rotor, a T-type double-modulation magnetic ring, an intermediate rotor, and an outer rotor. The inner rotor, the T-type double-modulation magnetic ring, and the intermediate rotor are nested in sequence and coaxially configured to form a radial and modulated coaxial magnetic gear structure; the intermediate rotor, the T-type double-modulation magnetic ring, and the outer rotor are nested in sequence and coaxially configured to form an axial and modulated coaxial magnetic gear structure. The inner rotor and the middle rotor are modulated by a combination of modulation and modulation, and the middle rotor and the outer rotor are modulated by a combination of modulation and modulation. The two modulations share a T-shaped dual-modulation magnetic ring to achieve the dual-modulation effect of the monotonic magnetic ring. The inner rotor, intermediate rotor, and outer rotor are magnetized tangentially, and the magnetization directions of two adjacent permanent magnets in the inner rotor are opposite, the magnetization directions of two adjacent permanent magnets in the intermediate rotor are opposite, and the magnetization directions of two adjacent permanent magnets in the outer rotor are opposite. There is a radial magnetic circuit between the inner rotor and the middle rotor, and there is an axial magnetic circuit and a transverse magnetic circuit between the middle rotor and the outer rotor; When the magnetic gear is working, the T-type double modulation magnetic ring is fixed, and the middle rotor, as the input rotor, drives the inner rotor and the outer rotor to rotate through the modulation effect of the T-type double modulation magnetic ring. A radial air gap is provided between the radial outer side of the inner rotor and the radial inner side of the T-type double modulation magnetic ring; a radial air gap is provided between the radial inner side of the middle rotor and the radial outer side of the T-type double modulation magnetic ring; an axial air gap is provided between the axial outer side of the middle rotor and the axial inner side of the T-type double modulation magnetic ring; a radial air gap is provided between the radial inner side of the outer rotor and the radial outer side of the T-type double modulation magnetic ring; and an axial air gap is provided between the axial inner side of the outer rotor and the axial outer side of the T-type double modulation magnetic ring. The T-type dual-modulation magnetic ring includes several magnetic cores, each of which is made of multiple silicon steel sheets stacked together, and adjacent magnetic cores are separated by epoxy resin jackets.

2. The multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear according to claim 1, characterized in that, The inner rotor, intermediate rotor, and outer rotor all adopt a spoke-type structure; The inner rotor includes an inner rotor permanent magnet and an inner rotor pole shoe. The inner rotor pole shoe is embedded between two adjacent inner rotor permanent magnets. The inner rotor pole shoe and the inner rotor permanent magnet support each other and work together with the T-type double modulation tuning ring to modulate the magnetic field. The intermediate rotor includes an intermediate rotor permanent magnet and an intermediate rotor pole shoe. The intermediate rotor pole shoe is embedded between two adjacent intermediate rotor permanent magnets. The intermediate rotor pole shoe and the intermediate rotor permanent magnet support each other and work together with the T-type double modulation tuning ring to modulate the magnetic field. The outer rotor includes an outer rotor permanent magnet and an outer rotor pole shoe. The outer rotor pole shoe is embedded between two adjacent outer rotor permanent magnets. The outer rotor pole shoe and the outer rotor permanent magnet support each other and work together with the T-type double modulation tuning ring to modulate the magnetic field.

3. The multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear according to claim 1, characterized in that, The thickness of the radial air gap on the middle rotor side is equal to the thickness of the radial air gap on the outer rotor side; the axial thickness of the inner rotor is equal to the axial thickness of the middle rotor; and the radial thickness of the middle rotor is equal to the radial thickness of the outer rotor.

4. The multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear according to claim 3, characterized in that, The magnetic gear satisfies the following formula: ； in, The radial length of the T-type double-modulation tuning ring. The radial thickness of the T-type double-modulation tuning ring. The thickness of the radial air gap on the middle rotor side. The radial thickness of the intermediate rotor.

5. The multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear according to claim 3, characterized in that, The magnetic gear satisfies the following formula: ； in, This refers to the axial length of the T-type double-modulation tuning ring. The axial thickness is the T-type double-modulation magnetic ring. This represents the axial thickness of the inner rotor. The axial thickness of the outer rotor. The thickness of the axial air gap on the middle rotor side. The thickness of the axial air gap on the outer rotor side.

6. The multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear according to claim 1, characterized in that, The magnetic gear satisfies the following formula: in, The number of tuning magnet cores for the T-type double-modulation tuning ring. Let be the number of pole pairs of the permanent magnets on the inner rotor. This represents the number of pole pairs of the permanent magnets on the intermediate rotor. denoted as the number of pole pairs of the permanent magnets on the outer rotor.

7. The multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear according to claim 6, characterized in that, The magnetic gear satisfies the following formula: in, This is for the transmission between the intermediate rotor and the inner rotor. This refers to the transmission ratio between the intermediate rotor and the outer rotor. The internal rotor speed, The intermediate rotor speed. This represents the rotational speed of the external rotor.

8. A hub motor for automobiles, characterized in that, The multi-magnetic-circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear as described in any one of claims 1 to 7.

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