Axially-arranged multi-phase multi-disc same-direction annular winding axial and radial magnetic flux permanent magnet motor

Abstract

The invention provides an axially-arranged multi-phase multi-disc homodromous annular winding axial and radial magnetic flux permanent magnet motor, a winding form of homodromous annular windings is adopted on a stator, the positive directions of coil currents at corresponding positions of adjacent stators of the motor are opposite, and a middle rotor iron core of a traditional multi-rotor structure motor with an annular winding is removed; furthermore, a radial rotor is additionally arranged on the outer side of the axial magnetic flux motor, and magnetic poles on the radial rotor are opposite in the axial direction and the circumferential direction. The axial-radial magnetic flux permanent magnet motor has the advantages that iron loss and eddy-current loss are reduced, the winding end part can be effectively utilized, and the output torque of the motor is provided.

Description

Technical Field

[0001] The present invention relates to a permanent magnet motor, and more specifically, to a multi-phase multi-disc coaxial ring winding axial-radial flux permanent magnet motor with an axial arrangement. Background Art

[0002] Electric drive technology is an important foundation for the full electrification of vehicles. The electric drive system is the power core of electric vehicles, and the in-wheel motor drive system is the ultimate drive form of the electric drive system. The performance of the in-wheel motor plays a decisive role in the in-wheel motor drive system. For the in-wheel drive system, the internal space is limited, which requires the in-wheel motor to have the characteristics of high power density, compact structure, and short axial dimension at the same time. Compared with radial motors, axial motors (also called disc motors) have a series of advantages such as a flat and ultra-thin structure, high power / torque density, high efficiency, low torque ripple, and stable operation, and have been rapidly popularized and applied in direct drive power generation systems, flywheel energy storage, high-precision servo systems, all-electric propulsion device systems, etc.

[0003] In the design of traditional axial flux motors, the drum-shaped winding and the ring winding are two common winding forms, each with its own unique advantages and disadvantages. When the drum-shaped winding is applied to a multi-disc structure, an NS magnetic pole configuration is usually adopted. This design can make the magnetic field form a large loop that penetrates the entire motor, thereby effectively reducing the amount of rotor core used and further reducing the overall volume of the motor, as shown in Figure 1 However, since only the effective conductor part embedded in the slot of the drum-shaped winding participates in the electromagnetic energy conversion, it is impossible to increase the output power of the motor by adding a radial rotor. This results in an increase in the ineffective length of the winding, which not only occupies additional space but also increases the copper loss, limiting the power density of the motor. The patent with publication number CN118826411A and invention name "An Axial-Radial Flux Hybrid Three-Rotor Permanent Magnet Synchronous Motor" proposes an improved solution by using a special-shaped winding to add a radial rotor, but this form makes the winding process of the motor complex and difficult. The method of directly increasing the stator coil to add a radial rotor not only increases the copper loss but also makes the structure of the stator core complex.

[0004] Although the ring winding can make full use of the winding ends in the axial-radial hybrid motor, when it is applied to a multi-disc structure, due to its special electromagnetic structure, it is impossible to remove the middle rotor core when simply superimposing, which makes the axial length of the motor longer, the core loss larger, and thus the torque density lower. The common structural forms of motors are shown in Figure 2As shown in the figure. To improve this situation, the patent with publication number CN105406669 A and invention title "A Multi-Air-Gap Axial Flux - Magnetic Field Modulation Permanent Magnet Motor" proposed an improvement scheme, that is, using an embedded permanent magnet structure. Compared with the bilateral surface-mounted permanent magnet structure, the embedded permanent magnet structure can provide an axial magnetic circuit that penetrates the entire rotor and the air gaps on both sides of the rotor, realizing the closed stator tooth magnetic circuit between the above-mentioned stators, and achieving the purpose of reducing the magnetic resistance on the main magnetic path. To further improve the permanent magnet utilization rate and obtain higher torque, each intermediate rotor slot is divided into two rectangular parts with different widths to imitate the design of fan-shaped slots. However, this complex design makes it difficult to manufacture the intermediate rotor core with laminated steel, significantly increasing the manufacturing difficulty. At the same time, the two stators of the motor are slotted bilaterally and adopt a toroidal winding around the radial direction, and are sequentially offset by half a slot pitch mechanical angle along the axial direction relative to the previous stator. Its purpose is to create a new magnetic flux path for the main magnetic flux and reduce the magnetic resistance of the main magnetic flux path to reduce magnetic flux leakage. However, this misalignment design will cause positioning difficulties in the actual manufacturing process, increasing the complexity and time cost of assembly. At the same time, the stator misalignment and magnetic circuit asymmetry lead to an increase in torque ripple, and the motor torque is reduced compared with the symmetric stator. During operation, additional vibration and noise may be generated, affecting the running stability and service life of the motor.

[0005] To solve the above existing problems, people have been seeking an ideal technical solution. Summary of the Invention

[0006] The object of the present invention is to address the deficiencies of the prior art, and thus provide an axially arranged multi-phase multi-disc co-directional toroidal winding axial-radial flux permanent magnet motor.

[0007] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, there is provided an axially arranged multi-phase multi-disc co-directional toroidal winding axial-radial flux permanent magnet motor, comprising: Two disc-shaped axial rotors and at least one disc-shaped intermediate member disposed between the two disc-shaped axial rotors; The disc-shaped intermediate member includes a non-magnetic fixing frame and a plurality of axial permanent magnets I mounted on the non-magnetic fixing frame along the circumferential direction. Each axial permanent magnet I has a magnetic pole opposite to that of its circumferentially adjacent axial permanent magnet, and also opposite to that of the axially adjacent axial permanent magnet I located at the same circumferential position; On one side of each disc-shaped axial rotor facing the disc-shaped intermediate member, a plurality of axial permanent magnets II are arranged along the circumferential direction. Any two adjacent axial permanent magnets II located on the same circumference have opposite magnetic poles, and each axial permanent magnet II has a magnetic pole opposite to that of the axially adjacent axial permanent magnet I located at the same circumferential position; A disc-type stator is provided between each disc-type axial rotor and its adjacent disc-type intermediate member, and between any two disc-type intermediate members. The disc-type stator includes a stator core and a co-directional annular winding. Three-phase electricity with opposite positive directions is applied to the co-directional annular windings on the disc-type stators on both sides of any one disc-type intermediate member. It further includes a plurality of radial rotors. Each radial rotor is correspondingly arranged on the outer circumference of a disc-type stator. A plurality of radial permanent magnets are installed on each radial rotor along the circumferential direction. The magnetic poles of any two circumferentially adjacent radial permanent magnets are opposite, and the magnetic poles of any two axially adjacent radial permanent magnets are also opposite.

[0008] In the present invention, a co-directional annular winding form is adopted. The positive directions of the coil currents at the corresponding positions of adjacent stators of the motor are opposite, and the intermediate rotor iron core of the traditional multi-rotor structure motor with an annular winding is removed, only the magnetic poles of the intermediate rotor are retained. After removing the iron core, the axial radius of the motor is significantly shortened, the weight is reduced, the torque density is higher, and at the same time, the iron loss and eddy current loss are reduced. This design also enhances the layer scalability of the motor, provides higher flexibility for the design of the multi-layer axial-flux motor, and further improves the torque density.

[0009] In the present invention, a radial rotor is added outside the axial-flux motor. The magnetic poles of the radial rotor are respectively adapted to the corresponding stators to ensure that the force directions of the radial rotors are the same. The addition of the radial rotor effectively utilizes the winding ends, makes full use of the magnetic field distribution characteristics of the annular winding, significantly improves the utilization rate of the magnetic circuit, enhances the output ability of the electromagnetic torque, and realizes the effective improvement of the torque density.

[0010] Further, the two disc-type axial rotors are fixedly connected to the motor rotating shaft through bearings; the two radial rotors at the axial two ends are respectively fixedly connected to the axial rotor through key grooves or screws, and the remaining radial rotors are fixedly connected to the adjacent disc-type intermediate members through the non-magnetic fixing frames; each disc-type stator is fixedly connected to the motor rotating shaft through a fixing member; thus, the axial rotor, the radial rotor, and the intermediate rotor form an integral structure. This integral rotor structure is connected to the shaft of the motor through bearings to ensure the smoothness and reliability of the rotor system during operation. The stator of the motor is directly connected to the motor shaft through a fixing member, enhancing the stability of the motor structure. This design simplifies the assembly process and improves the maintainability of the motor.

[0011] In a second aspect, a multi-phase multi-disc co-directional annular winding axial-flux permanent magnet motor is provided, including: two disc-type axial rotors and at least one disc-type intermediate member arranged between the two disc-type axial rotors; The disc-shaped middleware includes a non-magnetic fixed frame and a plurality of axial permanent magnets I mounted on the non-magnetic fixed frame along the circumferential direction. Each axial permanent magnet I has a magnetic pole opposite to that of the adjacent axial permanent magnet in the circumferential direction, and also opposite to that of the axial permanent magnet I adjacent axially and at the same circumferential position. On one side of each disc-shaped axial rotor facing the disc-shaped middleware, a plurality of axial permanent magnets II are arranged along the circumferential direction. Any two adjacent axial permanent magnets II on the same circumference have opposite magnetic poles, and each axial permanent magnet II has a magnetic pole opposite to that of the axial permanent magnet I adjacent axially and at the same circumferential position. A disc-shaped stator is provided between each disc-shaped axial rotor and the adjacent disc-shaped middleware, and also between any two disc-shaped middlewares. The disc-shaped stator includes a stator core and a co-directional annular winding. Three-phase electricity with opposite positive directions is applied to the co-directional annular windings on the disc-shaped stators on both sides of any one disc-shaped middleware. Description of the Drawings

[0012] Figure 1 is a multi-disc axial-flux structure.

[0013] Figure 2 is a common structural form of applying the annular winding to a multi-disc motor.

[0014] Figure 3 is the overall structure of the shaft-radial flux motor described in Embodiment 1.

[0015] Figure 4 is a sectional view of the shaft-radial flux motor described in Embodiment 1.

[0016] Figure 5 is the axial flux distribution diagram of the shaft-radial flux motor described in Embodiment 1.

[0017] Figure 6 is the middle rotor magnetic pole distribution diagram of the shaft-radial flux motor described in Embodiment 1.

[0018] Figure 7 is the flux distribution diagram of the radial rotor 1 of the shaft-radial flux motor described in Embodiment 1.

[0019] Figure 8 is the flux distribution diagram of the corresponding radial rotor 2 of the radial rotor 1 of the shaft-radial flux motor described in Embodiment 1.

[0020] Figure 9 is the flux distribution diagram of the corresponding radial rotor 2 of the radial rotor 1 of the shaft-radial flux motor described in Embodiment 1.

[0021] In the figure: 1. Disc axial rotor I; 2. Radial rotor I; 3. Disc stator I; 4. Disc intermediate piece; 5. Radial rotor II; 6. Disc stator II; 7. Disc axial rotor II; 8. Motor rotating shaft; 9. Non-magnetic fixing bracket; 10. Axial permanent magnet I; 11. Axial permanent magnet II; 12. Radial permanent magnet; 13. Bearing; 14. Stator core; 15. Co-rotating annular winding; 16. Magnetic circuit; 17. Fixing piece. Specific embodiments

[0022] The technical solutions of the present invention will be further described in detail below through specific embodiments.

[0023] Embodiment 1 This embodiment provides an axially arranged multi-phase multi-disc co-rotating annular winding 15 axial-radial flux permanent magnet motor, as Figures 3 - 9 shown, including: Disc axial rotor I 1, Disc axial rotor II 7, and a disc intermediate piece 4 disposed between the Disc axial rotor I 1 and the Disc axial rotor II 7.

[0024] The disc intermediate piece 4 includes a non-magnetic fixing bracket 9 and a plurality of axial permanent magnets I 10 mounted on the non-magnetic fixing bracket 9 along the circumferential direction, and the magnetic poles of any two axially adjacent axial permanent magnets I 10 are opposite; On one side of the Disc axial rotor I 1 and the Disc axial rotor II 7 facing the disc intermediate piece 4, a plurality of axial permanent magnets II 11 are arranged along the circumferential direction. The magnetic poles of any two adjacent axial permanent magnets II 11 located on the same circumference are opposite, and the magnetic poles of each axial permanent magnet II 11 and the axially adjacent axial permanent magnet I 10 located at the same circumferential position are opposite.

[0025] Specifically, both the axial permanent magnet I 10 and the axial permanent magnet II 11 are permanent magnets with NS poles arranged axially.

[0026] A disc stator is provided between each disc axial rotor and the adjacent disc intermediate piece 4 and between any two disc intermediate pieces 4. As shown in the figure, it includes Disc stator I 3 and Disc stator II 6. Both the Disc stator I 3 and the Disc stator II 6 include a stator core 14 and a co-rotating annular winding 15. The positive directions of the currents in the co-rotating annular windings 15 at corresponding positions of the Disc stator I 3 and the Disc stator II 6 are opposite, forming armature magnetic fields with opposite rotation directions.

[0027] During specific implementation, the A, B, and C phase currents in the co-rotating annular winding 15 of the axial flux permanent magnet motor stator change sinusoidally in a cycle, and the phase angles are mutually different by 120°; the motor rotation direction is consistent with the magnetic field rotation direction. Figure 5Shows the axial magnetic field distribution of the motor.

[0028] The disc-shaped intermediate member 4 forms permanent magnetic fields with opposite directions on both sides. Specifically, the magnetic field will pass through the disc-shaped intermediate member 4 from one disc-shaped stator and enter the other disc-shaped stator, forming a large-loop closed magnetic circuit 16. Figure 6 Shows the pole distribution diagram of the disc-shaped intermediate member 4. It can be seen that under the action of the armature magnetic field and the permanent magnetic field, the electromagnetic force directions on both sides of the disc-shaped intermediate member 4 are the same at this time. Therefore, compared with the traditional rotor, removing the iron core of the disc-shaped intermediate member 4 will not significantly affect the integrity of the magnetic circuit, while effectively shortening the axial length of the motor and reducing the iron loss and eddy current loss.

[0029] Furthermore, a small-loop magnetic circuit 16 is formed between each disc-shaped axial rotor and its opposing disc-shaped stator.

[0030] It should be noted that the permanent magnetic field directions on both sides of each disc-shaped stator are opposite.

[0031] Furthermore, a radial rotor is correspondingly arranged on the outer circumference of each said disc-shaped stator. As Figures 3 - 4 shown, a radial rotor I 2 is correspondingly arranged on the outer circumference of the disc-shaped stator I3, and a radial rotor II5 is correspondingly arranged on the outer circumference of the disc-shaped stator II 6.

[0032] A number of radial permanent magnets 12 are installed on the radial rotor I2 and the radial rotor II5 along the circumferential direction. The magnetic poles of any two circumferentially adjacent radial permanent magnets 12 are opposite, and the magnetic poles of the radial permanent magnets 12 at corresponding positions on the radial rotor I2 and the radial rotor II5 are opposite. Specifically, the radial permanent magnet 12 is a permanent magnet with NS poles arranged radially.

[0033] Figure 7 and Figure 8 respectively show the magnetic field distributions of the radial rotor I2 and the radial rotor II5. Since the current directions of the co-directional annular windings 15 at corresponding positions of the disc-shaped stator I3 and the disc-shaped stator II6 are opposite, the magnetic pole polarities at corresponding positions of the radial rotor I2 and the radial rotor II5 are opposite, so the electromagnetic force directions are the same.

[0034] This design makes full use of the magnetic field characteristics of the annular winding, realizes a radial-axial hybrid magnetic flux path, further optimizes the magnetic field distribution of the motor, and significantly improves the torque density and operating efficiency. The introduction of the radial rotor enables the motor to generate torque simultaneously in the axial and radial directions, thereby improving the overall performance of the motor.

[0035] As Figures 3 - 5As shown, the cross-sectional view of the motor shows the arrangement of the axial rotor, radial rotor, and disc-shaped intermediate member 4. This design enables the motor to make full use of the axial and radial magnetic field distributions during operation, forming an efficient hybrid magnetic flux path.

[0036] In the present invention, the winding form of the co-directional annular winding 15 is adopted, and the positive directions of the coil currents at the corresponding positions of adjacent stators of the motor are opposite. Moreover, the iron core of the disc-shaped intermediate member 4 of the traditional multi-rotor structure motor with an annular winding is removed, and only the magnetic poles of the disc-shaped intermediate member 4 are retained. After removing the iron core, the axial radius of the motor is significantly shortened, the weight is reduced, the torque density is higher, and at the same time, the iron loss and eddy current loss are reduced. This design also enhances the layer scalability of the motor, provides higher flexibility for the design of the multi-layer axial flux motor, and further improves the torque density.

[0037] In the present invention, a radial rotor is added outside the axial flux motor, and the magnetic poles of the radial rotor are respectively adapted to the corresponding stators to ensure that the force directions of the radial rotor are the same. The addition of the radial rotor effectively utilizes the winding ends, makes full use of the magnetic field distribution characteristics of the annular winding, significantly improves the utilization rate of the magnetic circuit, enhances the output ability of the electromagnetic torque, and effectively improves the torque density.

[0038] In another embodiment, the axial permanent magnet II 11 is a permanent magnet with NS poles arranged axially, and the disc-shaped intermediate member 4 is formed with an axial permanent magnet I 10 by using a Halbach array arrangement, as Figure 9 shown.

[0039] Furthermore, two disc-shaped axial rotors are fixedly connected to the motor rotating shaft through bearings 14; the two radial rotors located at the axial ends are respectively fixedly connected to the axial rotor through key grooves or screws, and the remaining radial rotors are fixedly connected to the adjacent disc-shaped intermediate member 4 through the non-magnetic fixing frame 9; each disc-shaped stator is fixedly connected to the motor rotating shaft through a fixing member 17. This overall rotor structure is connected to the shaft of the motor through the bearing 14 to ensure the stability and reliability of the rotor system during operation. The stator of the motor is directly connected to the motor shaft through the fixing member 17, enhancing the structural stability of the motor. This design simplifies the assembly process and improves the maintainability of the motor.

[0040] Embodiment 2 The difference between this embodiment and Embodiment 1 is that there are at least two disc-shaped intermediate members 4 provided between the disc-shaped axial rotor I 1 and the disc-shaped axial rotor II 7; The disc-shaped intermediate member 4 includes a non-magnetic fixing frame 9 and a plurality of axial permanent magnets I 10 installed on the non-magnetic fixing frame 9 along the circumferential direction. Each axial permanent magnet I 10 has opposite magnetic poles to the axially adjacent permanent magnet and the circumferentially adjacent axial permanent magnet at the same circumferential position. A disc stator is provided between each disc axial rotor and its adjacent disc intermediate member 4, and also between any two disc intermediate members 4. The disc stator includes a stator core 14 and a co-directional annular winding 15. Three-phase electricity with opposite positive directions is applied to the co-directional annular windings 15 on the disc stators on both sides of any one disc intermediate member 4.

[0041] The number of the radial rotors is the same as that of the disc stators. Each radial rotor is correspondingly arranged with a disc stator and is arranged on the circumferential outer side of the disc stator.

[0042] A number of radial permanent magnets 12 are mounted on each radial rotor along the circumferential direction. The magnetic poles of any two circumferentially adjacent radial permanent magnets 12 are opposite, and the magnetic poles of any two axially adjacent radial permanent magnets 12 are also opposite.

[0043] Embodiment 3 This embodiment provides a structure of a poly-phase multi-disc co-directional annular winding 15 axial-flux permanent magnet motor, which includes: 1 disc intermediate member 4, and disc axial rotor I 1 and disc axial rotor 2 respectively arranged on the axial two sides of the disc intermediate member 4. A disc stator I 3 is provided between the disc axial rotor 1 and the disc intermediate member 4, and a disc stator II 6 is provided between the disc axial rotor 2 and the disc intermediate member 4; The disc stator I 3 and the disc stator II 6 are respectively provided with a stator core 14 and a co-directional annular winding 15. Among them, the co-directional annular windings 15 at corresponding positions on the disc stator I 3 and the disc stator II 6 are passed with reverse current to form armature magnetic fields with opposite rotation directions.

[0044] The disc intermediate member 4 includes a non-magnetic fixing frame 9 and a number of axial permanent magnets I 10 mounted on the non-magnetic fixing frame 9 along the circumferential direction. The magnetic poles of each axial permanent magnet I 10 are opposite to those of its circumferentially adjacent axial permanent magnet I 10, and also opposite to those of its axially adjacent axial permanent magnet I 10 located at the same circumferential position.

[0045] Further, a number of axial permanent magnets II 11 are arranged along the circumferential direction on one side of the disc axial rotor I 1 and the disc axial rotor II 7 facing the disc intermediate member 4. The magnetic poles of any two adjacent axial permanent magnets II 11 located on the same circumference are opposite, and the magnetic poles of each axial permanent magnet II 11 are opposite to those of its axially adjacent axial permanent magnet I10 located at the same circumferential position.

[0046] Specifically, both the axial permanent magnet I 10 and the axial permanent magnet II 11 are permanent magnets with NS poles arranged axially.

[0047] During specific implementation, the A, B, and C phase currents in the co-directional ring winding 15 of the axial-flux permanent magnet motor change sinusoidally and periodically, and the phase angles are mutually offset by 120°; the motor rotation direction is the same as the magnetic field rotation direction. Figure 5 Shows the axial magnetic field distribution of the motor.

[0048] Adopting the winding form of the co-directional ring winding 15, the positive directions of the coil currents at corresponding positions of adjacent stators of the motor are opposite, and the disc-shaped intermediate core 4 of the traditional multi-rotor structure motor with a ring winding is removed, only the magnetic poles of the disc-shaped intermediate core 4 are retained. After removing the core, the axial radius of the motor is significantly shortened, the weight is reduced, the torque density is higher, and at the same time, the iron loss and eddy current loss are reduced. This design also enhances the scalability of the number of layers of the motor, provides higher flexibility for the design of the multi-layer axial-flux motor, and further improves the torque density.

[0049] This embodiment provides an axially arranged multi-phase multi-disc co-directional ring winding 15 axial-radial flux permanent magnet motor. Based on the axial-flux permanent magnet motor described in Embodiment 1 or Embodiment 2, a radial rotor is further added outside the axial-flux motor, and thus the winding ends can be effectively utilized to provide the output torque of the motor.

[0050] Embodiment 4 The difference between this embodiment and Embodiment 1 is that it includes at least 2 disc-shaped intermediate cores 4 and disc-shaped axial rotors I 1 and disc-shaped axial rotors 2 respectively arranged on both axial sides of each disc-shaped intermediate core 4. A disc-shaped stator I 3 is arranged between the disc-shaped axial rotor 1 and the disc-shaped intermediate core 4, and a disc-shaped stator II 6 is arranged between the disc-shaped axial rotor 2 and the disc-shaped intermediate core 4; Co-directional ring windings 15 are respectively arranged on the disc-shaped stator I 3 and the disc-shaped stator II 6. Among them, the co-directional ring windings 15 at corresponding positions on the disc-shaped stator I 3 and the disc-shaped stator II 6 are energized with reverse currents to form armature magnetic fields with opposite rotation directions. Correspondingly, the magnetic properties of the axial-flux magnetic poles at corresponding positions of the axial rotor 1 and the axial rotor 2 are opposite; On one side of the disc-shaped axial rotor I 1 and the disc-shaped axial rotor II 7 facing the disc-shaped intermediate core 4, a number of axial permanent magnets II 11 are arranged along the circumferential direction. The magnetic poles of any two adjacent axial permanent magnets II 11 located on the same circumference are opposite, and the magnetic poles of each axial permanent magnet II 11 and the axial permanent magnet I 10 adjacent to it axially and located at the same circumferential position are opposite.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements on some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. An axially arranged multi-phase multi-disc same-direction annular winding axial radial flux permanent magnet motor, characterized in that: include: Two disk-type axial rotors and at least one disk-type intermediate piece arranged between the two disk-type axial rotors; The disk-type intermediate member includes a non-magnetic fixing frame and a plurality of axial permanent magnets I mounted on the non-magnetic fixing frame along the circumferential direction, wherein each axial permanent magnet I has a magnetic pole opposite to that of the axial permanent magnets adjacent to it in the circumferential direction, and has a magnetic pole opposite to that of the axial permanent magnets I adjacent to it in the axial direction and located at the same circumferential position; A plurality of axial permanent magnets II are arranged along the circumferential direction on one side of each disc-type axial rotor facing the disc-type intermediate piece, and the magnetic poles of any two adjacent axial permanent magnets II located on the same circumference are opposite, and the magnetic poles of each axial permanent magnet II and the axial permanent magnet I adjacent to it and located at the same circumferential position are opposite; A disc stator is arranged between each disc axial rotor and the adjacent disc intermediate piece and between any two disc intermediate pieces, and the disc stator comprises a stator core and a same-direction annular winding, wherein three-phase electricity with opposite positive directions is applied to the same-direction annular windings on the disc stators on both sides of any disc intermediate piece; It also includes a plurality of radial rotors, each of which is arranged on the circumferential outer side of a disc stator, and each of which is mounted with a plurality of radial permanent magnets along the circumferential direction, the magnetic poles of any two circumferentially adjacent radial permanent magnets are opposite, and the magnetic poles of any two axially adjacent radial permanent magnets are opposite.

2. The axially arranged multi-phase multi-disc same-direction annular winding axial radial flux permanent magnet motor according to claim 1, characterized in that: The two disc-type axial rotors are fixedly connected to the motor shaft through bearings; the two radial rotors located at the two axial ends are fixedly connected to the axial rotor through keyways or screws respectively, and the remaining radial rotors are fixedly connected to the adjacent disc-type intermediate pieces through the non-magnetic fixing frame; each disc-type stator is fixedly connected to the motor shaft through a fixing piece.

3. The axially arranged multi-phase multi-disc same-direction annular winding axial radial flux permanent magnet motor according to claim 2, characterized in that: The axial permanent magnet I and the axial permanent magnet II are both permanent magnets with NS poles arranged along the axial direction.

4. The axially arranged multi-phase multi-disc same-direction annular winding axial radial flux permanent magnet motor according to claim 2, characterized in that: The axial permanent magnet II is a permanent magnet with NS poles arranged along the axial direction, and the disc-type intermediate piece is an axial permanent magnet I formed by adopting a Halbach array arrangement.

5. The axially arranged multi-phase multi-disc same-direction annular winding axial radial flux permanent magnet motor according to claim 1 or 2 or 3 or 4, characterized in that: The radial permanent magnet is a permanent magnet with NS poles arranged radially.

6. A multi-phase multi-disk same-direction annular winding axial flux permanent magnet motor, characterized in that: include: Two disk-type axial rotors and at least one disk-type intermediate piece arranged between the two disk-type axial rotors; The disk-type intermediate member includes a non-magnetic fixing frame and a plurality of axial permanent magnets I mounted on the non-magnetic fixing frame along the circumferential direction, wherein each axial permanent magnet I has a magnetic pole opposite to that of the axial permanent magnets adjacent to it in the circumferential direction, and has a magnetic pole opposite to that of the axial permanent magnets I adjacent to it in the axial direction and located at the same circumferential position; A plurality of axial permanent magnets II are arranged along the circumferential direction on one side of each disc-type axial rotor facing the disc-type intermediate piece, and the magnetic poles of any two adjacent axial permanent magnets II located on the same circumference are opposite, and the magnetic poles of each axial permanent magnet II and the axial permanent magnet I adjacent to it and located at the same circumferential position are opposite; A disc stator is arranged between each disc axial rotor and the adjacent disc intermediate piece and between any two disc intermediate pieces, and the disc stator includes a stator core and a unidirectional annular winding, wherein three-phase electricity with opposite positive directions is applied to the unidirectional annular windings on the disc stators on both sides of any disc intermediate piece.

7. A multi-phase multi-disc same-direction annular winding axial flux permanent magnet motor according to claim 6, characterized in that: The axial permanent magnet I and the axial permanent magnet II are both permanent magnets with NS poles arranged along the axial direction.

8. The multi-phase multi-disc same-direction annular winding axial flux permanent magnet motor according to claim 6, characterized in that: The axial permanent magnet II is a permanent magnet with NS poles arranged along the axial direction, and the disc-type intermediate piece is an axial permanent magnet I formed by adopting a Halbach array arrangement.

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