Natural electromagnetic levitation ducted motor

Abstract

This invention relates to the field of motors and is a naturally magnetically levitated ducted motor. The invention addresses the problems of large magnetic bearing volume and high power loss in impellers using traditional magnetic levitation technology. The stator core of this invention is divided into six circumferentially equal segments, each serving as a magnetic pole. Stator windings are wound around these six magnetic poles. The stator windings are three-phase, with two windings in each phase arranged in mirror symmetry and connected in parallel. The impeller includes a main blade and annular secondary blades. The main blades are concentrically located within a ring formed by the four permanent magnets. The ring formed by the four permanent magnets is located between the stator cores of the two stator drive controllers. The windings of the upper and lower torque motors of the naturally magnetically levitated compressor device operate in mirror parallel, with the same current, generating the same tangential torque, while the axial natural magnetic levitation forces are opposite. Therefore, the impeller can naturally magnetically levitate at the rotation center of the magnetic levitation fan device of this invention, thus constituting a naturally magnetically levitated fan device.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of electric machines. BACKGROUND

[0002] The floating channel type hydraulic generator and the propelling electric machine both use high-speed rotating impellers to increase the pressure difference of the fluid at the input and output ports. The impeller rotor rotates continuously at high speed, and it is usually desired to have a large flow and pressure. Since the rotor rotates at high speed, the rotor impeller rubs against the liquid (or air) at high speed, so the vibration and noise are relatively large. In particular, the stiffness and dynamic balance accuracy of the impeller are limited, so the impact vibration on the bearings of the hydraulic generator and propelling electric machine system is relatively large. The higher the rotational speed of the impeller, the higher the output power and the smaller the volume. The higher the rotational speed, the greater the vibration and noise, and the shorter the bearing life. The rotational speed of the impeller is usually 5000 r / min to 12000 r / min. In practical applications, the bearings of the hydraulic generator and propelling electric machine system often become a bottleneck that affects the improvement of the rotational speed, the expansion of the power capacity, the improvement of the efficiency and the life of the system. The single-stage wind pressure ratio of the impeller cannot be made relatively high, and the high-power hydraulic generator and propelling electric machine system can only use multi-stage impellers to increase the pressure ratio and expand the power capacity.

[0003] The vibration and noise of the impeller are related to the rotational speed and the natural frequency of the rotor. When the rotational speed of the rotor is close to or equal to the natural frequency of the rotor, the system will resonate and appear a violent vibration phenomenon. The rotational speed at which the resonance phenomenon occurs is called the critical speed of the shaft. For the hydraulic generator and propelling electric machine with multi-stage impellers, the structure is very complex, and the simulation analysis of the resonance phenomenon is also very difficult, so the design of the high-speed hydraulic generator and propelling electric machine has bottlenecks.

[0004] Using traditional liquid suspension technology can greatly improve the vibration and noise indicators of the impeller, and improve the efficiency and life. However, the traditional liquid suspension bearing is large in size, and a special air pump or hydraulic pump is also needed, the controller system is large in size and complex, the reliability is poor, there is additional power loss, and the production cost is very high. Moreover, in the liquid, especially in the seawater environment, the service life of the traditional mechanical bearing is very short, and the service life of the traditional liquid suspension is also very short.

[0005] If the traditional magnetic suspension bearing technology is used, the traditional magnetic suspension bearing is also large in size, the size of the controller is also large, the additional power loss is large, and the production cost is high. In general, to magnetically suspend the rotor of an electric machine, a traditional magnetic suspension bearing with a size comparable to that of the electric machine is needed. In addition to the high price, the large size is also the reason why the traditional magnetic suspension bearing technology cannot be popularized. SUMMARY

[0006] The present application is to solve the problem of large size and high power loss of the impeller using traditional magnetic suspension technology, and provides a natural electromagnetic magnetic suspension channel type electric machine system.

[0007] The natural electromagnetic magnetic levitation ducted motor system has two structures, which are as follows:

[0008] The first natural electromagnetic magnetic levitation ducted motor system comprises two stator drive controllers and a fan blade, the two stator drive controllers are coaxially located on the two sides of the fan blade, the stator drive controller comprises a stator winding, an annular stator core and a 4-pole annular sector-shaped permanent magnet, the stator core is evenly divided into six segments along the circumference and serves as six magnetic poles of the stator core respectively, the stator winding is wound on the six magnetic poles, the stator winding is three-phase and two windings in each phase are mirror-symmetrically arranged and are connected in parallel with each other, the main blade of the fan blade is concentrically located in a circular ring formed by the 4-pole permanent magnet, and the circular ring formed by the 4-pole permanent magnet is located between the stator cores of the two stator drive controllers.

[0009] Further, the natural electromagnetic magnetic levitation ducted motor system further comprises a shell, the two stator drive controllers and the fan blade are located inside the shell, the shell is a cylindrical cavity structure, the two end faces of the cylindrical cavity structure are provided with circular holes with equal diameters and coaxial arrangement, and the circular holes are coaxially arranged with the inner diameter of the stator core.

[0010] Further, the fan blade further comprises an annular auxiliary wing blade, the auxiliary wing blade is coaxially located on the outer circumference of the main blade.

[0011] The second natural electromagnetic magnetic levitation ducted motor system comprises a stator drive controller and a vortex blade, the stator drive controller is coaxially sleeved on the outer circumference of the vortex blade, the stator drive controller comprises a stator winding, a stator core and a surface-mounted permanent magnet, the stator winding is wound in the stator slot of the inner ring of the stator core, the stator winding is a three-phase winding, each phase winding comprises at least one pair of winding pairs arranged in a central symmetry, the center of symmetry is the center of the stator core, and the permanent magnet is arranged on the outer circumference of the vortex blade.

[0012] Further, the natural electromagnetic magnetic levitation ducted motor system further comprises a shell and a base, the stator drive controller and the fan blade are located inside the shell, the shell is a cylindrical cavity structure, the two end faces of the cylindrical cavity structure are provided with circular holes with equal diameters and coaxial arrangement, the circular holes are coaxially arranged with the inner diameter of the stator core, and the side wall of the shell is fixed on the base.

[0013] Further, the stator core and the permanent magnet are evenly divided into multiple segments along the axial direction.

[0014] Further, the material of the shell is one or more of engineering plastics and non-magnetic metal materials; and the material of the permanent magnet is one or more of sintered neodymium iron boron and bonded neodymium iron boron.

[0015] The traditional fan rotates at high speed, in addition to generating a large amount of friction loss and noise, there is also a principle of bearing friction loss, impeller dynamic balance precision is limited, there is a principle of dynamic unbalance caused by unbalanced load, these problems produce principle vibration, noise and additional loss, seriously affect the service life of the fan. The natural suspension technology is adopted, the bearing friction loss is zero, the impeller dynamic balance precision is not sensitive, or the natural suspension technology has the ability of natural absorption or inhibition of principle vibration, noise and additional loss. Make it possible to improve the power density of the pump by increasing the speed of the impeller, greatly simplify the structure of the pump, reduce the production cost, reduce the vibration noise and additional loss, improve the overall performance.

[0016] The application has high space utilization, small axial size, and is beneficial to form a flat overall structure, and the flat fan device can be applied to more working scenes. More importantly, through the flat module, the axial series connection can improve the pressure and flow. All currents in the winding of the application jointly participate in naturally suspending the motor rotor, can provide natural electromagnetic magnetic suspension force, in addition to adopting natural electromagnetic magnetic suspension technology, also through modular series connection to improve the pressure and flow, and improve the power capacity. The application does not need any additional sensors and controllers, and naturally contains: radial active natural magnetic suspension technology, axial passive magnetic suspension technology, radial and axial suspension technology. It has the most complete fan blade suspension function, and also has the function of excellent motor synchronous drive.

[0017] The application has bearingless design, does not need strict sealing in liquid, especially in seawater environment, solves the problem that the service life of traditional mechanical bearing is very short due to serious corrosion. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the motor;

[0019] Figure 2 It is a schematic diagram of the structure of the fan blade in the motor;

[0020] Figure 3 It is a schematic diagram of the structure of the stator driving controller in the motor;

[0021] Figure 4 It is a schematic diagram of the series type propelling motor;

[0022] Figure 5 It is a schematic diagram of the structure of the water turbine

[0023] Figure 6 It is a schematic diagram of the structure of the stator driving controller in the water turbine;

[0024] Figure 7 It is a schematic diagram of the series type water turbine. DETAILED DESCRIPTION

[0025] 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, and 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. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0026] Specific implementation method one: Refer to Figures 1 to 4 This embodiment describes a natural electromagnetic levitation ducted motor system, comprising two stator drive controllers 1, fan blades 2, and a housing 3. The housing 3 is a cylindrical cavity structure with coaxial circular holes of equal diameter on both end faces. These holes are coaxially aligned with the inner diameter of the stator core 102. The two stator drive controllers 1 and the fan blades 2 are located inside the housing 3. The two stator drive controllers 1 are coaxially positioned on either side of the fan blades 2.

[0027] The stator drive controller 1 includes a stator winding 101, a ring-shaped stator core 102, and a 4-pole ring-shaped permanent magnet 103. The stator core 102 is divided into six equal segments along its circumference, each serving as one of the six magnetic poles. The stator winding 101 is wound around these six magnetic poles. The stator winding 101 is three-phase, with two windings in each phase arranged in a mirror-symmetrical configuration and connected in parallel.

[0028] The fan blade 2 includes a main blade and annular secondary blades. The main blade is concentrically located within the ring formed by the four permanent magnets 103. The ring formed by the four permanent magnets 103 is located between the stator cores 102 of the two stator drive controllers 1. The secondary blades are coaxially located on the outer circumference of the main blade.

[0029] Specifically, this embodiment is a magnetic levitation ducted propulsion motor system. The dual-stator drive controller 1 constitutes a dual-stator single-rotor permanent magnet motor, and also constitutes radial passive magnetic levitation between the stator and rotor, enabling the stator and rotor to maintain concentricity. Through the special series-parallel connection method of the windings in this embodiment, the six magnetic poles in one stator drive controller 1 achieve radial active natural magnetic levitation by connecting them in series. The two three-phase windings and their midpoints are connected in parallel in a mirror direction, with the same current, generating the same tangential torque, while the axial natural magnetic levitation forces are opposite. Therefore, the impeller can achieve natural magnetic levitation, forming a natural magnetic levitation compressor device. The specific series-parallel connection method is as follows: Figure 3As shown: Two mirror-symmetrical windings U1 and U2 of phase U are connected in parallel, with their ends connected to the midpoint of the three-phase windings, forming a parallel branch of the phase U winding; two mirror-symmetrical windings V3 and V4 of phase V are connected in parallel, with their ends connected to the midpoint of the three-phase windings, forming a parallel branch of the phase V winding; two mirror-symmetrical windings W5 and W6 of phase W are connected in parallel, with their ends connected to the midpoint of the three-phase windings, forming a parallel branch of the phase W winding. Thus, each of the three-phase windings U, V, and W has a mirror-symmetrical parallel branch. When the air gap is uniform, the current in any 180° symmetrical parallel branch is the same. When the air gap deviates, the air gap between certain 180° symmetrical parallel branches deviates, the back EMF of the side with the smaller air gap increases, and the back EMF of the side with the larger air gap decreases. Therefore, the current in the branch with the smaller air gap decreases, and the current in the branch with the larger air gap increases. This results in a decrease in electromagnetic pull on the side with the smaller current and an increase in electromagnetic pull on the side with the larger current. This causes the rotor to move radially in the direction of restoring uniform air gap, achieving natural electromagnetic levitation. Each phase of the three-phase winding has a 180° symmetrical parallel branch, forming a special three-phase winding. When the motor rotates, this winding can actively, naturally, and uniformly restore or stabilize the rotor at the center position from six evenly distributed radial positions; this is the effect of "radial natural electromagnetic levitation." Simultaneously, the dual-stator drive controller 1 jointly drives the 4-pole permanent magnet rotor to rotate. This structure has high space utilization and small axial dimensions, which is beneficial for forming a flat, integrated structure. The magnetic levitation compressor device of this invention includes drive and computer control circuits, has a compact and simple structure, and features high reliability and high control performance.

[0030] The upper and lower torque motors of the natural magnetic levitation compressor device provided in this embodiment operate in parallel in a mirror direction, with the same current and thus the same tangential torque, while the axial natural magnetic levitation forces are opposite. Therefore, the impeller can be naturally magnetically levied at the rotation center of the magnetic levitation fan device of this invention, thus constituting a natural magnetic levitation fan device.

[0031] To enhance the radial and axial levitation force in this embodiment, the fan blades are evenly distributed with six secondary blades, each 0.2mm to 0.5mm in height. When the fan blades rotate at high speed, the secondary blades also drive the gas to rotate at high speed. The pressure generated by the high-speed gas points towards the inner circumference of the motor, and simultaneously, also towards the upper and lower sides of the motor. In other words, when the fan blades rotate at high speed, a small portion of the airflow enters the cavity from the inner circumference of the motor, generating pressure pointing towards the inner circumference and simultaneously towards the upper and lower sides of the motor. This pressure generates an effective radial gas levitation force, suspending the entire fan blade. This embodiment utilizes the secondary blades to generate effective additional radial and axial gas levitation forces. Once the fan blades rotate, the fluid simultaneously generates axial vertical thrust components and radial thrust components, achieving both axial and radial gas levitation. Simultaneously, the rotational inertial mass further enhances stable levitation. Axial and radial gas levitation can overcome most of gravity, making the energy requirement for axial and radial active natural magnetic levitation very small, almost energy-free.

[0032] This embodiment features a simple and reliable mechanical structure and control circuit, incorporating: radial active natural magnetic levitation technology, axial active natural magnetic levitation technology, radial passive magnetic levitation technology, and radial and axial gas suspension technology. These levitation technologies collectively ensure that the fan blades possess a sufficiently strong natural levitation capability. Compared to traditional impellers, this embodiment can easily increase the rotational speed by three times, achieving a three-fold increase in power, a three-fold reduction in size, and a three-fold decrease in cost.

[0033] The stator drive controller 1 uses two stator cores, one upper and one lower, to jointly drive the permanent magnet located in the fan blades to rotate. However, both stator cores exert axial attraction on the permanent magnet rotor. The attraction is equal on both sides only when the permanent magnet rotor is axially centered on both stator cores. If there is any deviation in the air gap between the upper and lower sides, the permanent magnet rotor will be attracted to the side with the smaller air gap. Therefore, in the static and initial states, the permanent magnet rotor will be randomly attracted to the side with the smaller air gap. The axial direction of the permanent magnet rotor is unstable, and an active axial magnetic levitation is required to suspend the permanent magnet rotor in the axial direction. In this embodiment, the three-phase windings formed by the upper stator core and the three-phase windings formed by the lower stator core are connected in parallel in a mirror direction. The back electromotive force of the three-phase winding on the side with the smaller air gap increases and the three-phase current decreases. Conversely, the back electromotive force of the three-phase winding on the side with the larger air gap decreases and the three-phase current increases. As a result, the axial tension on the side with the larger air gap increases and the axial tension on the side with the smaller air gap decreases, which inevitably causes the axial air gap to change in the direction of decreasing deviation and stabilizes the air gap deviation.

[0034] In this embodiment, the stator drive controller 1 contains drive and control circuits, and only has three external connections, such as power+, power ground, and USB, ensuring high reliability. The flat magnetic levitation fan device can operate independently or be connected to an external system control system via the three-wire interface. Parameters such as voltage, current, rotor speed, pressure, and flow rate can be read via the USB serial interface for use by the intelligent control system.

[0035] In this embodiment, the outer shell 3 is made of engineering plastic or non-magnetic metal material, or a combination of both. The embedded fan-shaped multipole permanent magnet sheet for transmitting torque is enclosed in the fan blade to prevent the permanent magnet sheet from being corroded by the gas. The engineering plastic material can be one or more of the following: modified polytetrafluoroethylene, polyimide, and silicon-based polymer materials. The permanent magnet sheet is made of sintered NdFeB, bonded NdFeB material, or other high energy product permanent magnets. No back iron is required, so the weight of the rotating body is very small.

[0036] The drive motor in stator drive controller 1 is a dual-stator core axial magnetic circuit motor. This motor is a fractional-slot concentrated winding motor, such as a 10-pole 12-slot motor, which has low positioning torque and high efficiency, power density, and reliability. Both the upper and lower stator cores use fan-shaped pole shoes and circular magnetic pole posts, wound with high-silicon steel sheets. The motor windings are directly wound on the 12 magnetic poles. The upper and lower stator cores, along with the 10-pole permanent magnet rotor in the fan blades located within the cavity between the two stator cores, constitute the dual-stator core axial magnetic circuit motor. The 12 magnetic poles of the upper and lower stator cores and the 10-pole permanent magnet rotor are all circumferentially distributed and have overlapping diameters. Therefore, the magnetic poles of the upper and lower stator cores, being magnetically conductive, are inevitably attracted by the permanent magnet rotor. Because both are circumferentially distributed and have overlapping diameters, they form a radial passive magnetic levitation that allows them to attract each other, meaning the stator and rotor possess a restoring ability to maintain concentricity. Furthermore, since the diameter DR of the permanent magnet rotor poles is slightly larger than the diameter DS of the stator poles, this radial passive magnetic levitation is a radially stable passive magnetic levitation. The winding coefficient kw1 of this 10-pole, 12-slot motor is 0.933.

[0037] In this embodiment, the pole arc of the 6-pole stator core is:

[0038] (0.9~0.75)τd / Z=(0.9~0.75)360° / 6=(0.9~0.75)60°;

[0039] The pole arc of a 4-pole rotor is:

[0040] (1.0~0.85)τr / 2p=(1.0~0.85)360° / 4=(1.0~0.85)90°.

[0041] The pole arcs of the stator core create gaps between adjacent stator core pole arcs. Insulating material can be added into these gaps to make the surface of the stator core pole arcs smooth and flat, thereby reducing the resistance of fluids or gases within the compressor.

[0042] The drive controller also includes drive and control circuits and a control interface. The winding currents of the two torque motors are the same, and they share a single rotor to generate tangential torque. Therefore, the high-speed rotation of the impeller generates two symmetrical airflows, one above the other, and simultaneously produces symmetrical but opposite axial gas levitation forces, enabling axial gas levitation of the impeller. The rotor speed reaches 5000–30000 r / min. This invention increases the speed from 3000 r / min to 30000 r / min, a tenfold increase, achieving the significant goals of a tenfold increase in power, a tenfold reduction in size, and a nearly tenfold decrease in cost.

[0043] This implementation also enables the improvement of wind pressure and flow rate, as well as power capacity, through modular series connection. By individually adjusting the rotational speed of each module, the wind pressure, flow rate, and power can be automatically adjusted. Individual adjustments to the rotational speed and phase difference of each module achieve the synthesis of airflow, thus suppressing vibration and noise. Doubling the number of series modules doubles the wind pressure and flow rate, and doubles the power capacity; using more stages of modules can achieve even greater wind pressure, flow rate, and power capacity.

[0044] Specific Implementation Method Two: Refer to Figures 5 to 7 This embodiment describes a natural electromagnetic levitation ducted motor system, including a stator drive controller 1, a turbine blade 5, a housing 3, and a base 4. The stator drive controller 1 is coaxially fitted onto the outer circumference of the turbine blade 5. Both the stator drive controller 1 and the turbine blade 2 are located inside the housing 3, which is a cylindrical cavity structure. Both ends of this cylindrical cavity structure have coaxial holes of equal diameter. These holes are coaxially aligned with the inner diameter of the stator core 102. The sidewalls of the housing 3 are fixed to the base 4.

[0045] The stator drive controller 1 includes a stator winding 101, a stator core 102, and a surface-mounted permanent magnet 103. The stator winding 101 is wound in the stator slots of the inner ring of the stator core 102. The stator winding 101 is a three-phase winding, and each phase winding includes at least one pair of windings arranged symmetrically along the axis. The center of symmetry of the symmetrical arrangement is the center of the circle of the stator core 102. The permanent magnet 103 is disposed on the outer circumference of the vortex blade 5. Both the stator core 102 and the permanent magnet 103 are divided into multiple segments along the axial direction.

[0046] In this embodiment, the motor is a dual-stator single-rotor permanent magnet motor or a radial magnetic circuit permanent magnet motor. The motor is a fractional-slot concentrated winding motor, where the ratio of the number of slots Z to the number of phases m is even. Therefore, each phase winding of this type of motor can form a winding symmetrically distributed along a 180° circumference, and can generate a centrally symmetrical torque. Specifically, in this embodiment, the number of slots Z = 36, the number of pole pairs p = 20, and the number of phases m = 3. The motor stator core 102 is divided into 4 segments to obtain a greater axial passive magnetic levitation capability; the stator winding 101 does not need to be segmented along with the stator core. The stator winding 101 is divided into four groups of windings symmetrically distributed along the center of the circumference. Each group has three adjacent windings connected end-to-end in series, forming a branch. Similarly, the other three groups of windings in this phase are connected in the same way: the three adjacent windings in each group are connected end-to-end in series, forming a branch. Then, the two symmetrical branches formed by the two centrally symmetrical winding groups are connected to form parallel branch windings. The principle of parallel connection is: when the number of pole pairs p is even, the two parallel branch windings are connected in parallel at opposite ends; when p is odd, the two parallel branch windings are connected in parallel at the same ends. One end of the two parallel branch windings is used as the midpoint of the phase winding.

[0047] In this implementation, p is an even number. Two parallel branch windings are connected in parallel with opposite-named ends from start to finish. The U-phase winding has two orthogonal parallel branches, a midpoint, and a U-phase winding port. This process is repeated for all three phase windings of the motor, forming centrally symmetrical parallel branches. Furthermore, the U, V, and W phase ports and the midpoint of the three-phase winding constitute the three-phase winding. This ultimately forms a special centrally symmetrical parallel branch three-phase winding. Each phase winding has one or more pairs of centrally symmetrical parallel branches. The current in these centrally symmetrical parallel branches is, in principle, the same when there is no deviation in the stator and rotor air gaps. There is an attractive force between the stator core and the permanent magnet. Due to the bearings, the air gap between the stator and rotor remains equal, and the attractive force is equal everywhere along the circumference. The bearings ensure that the radial attractive force within the motor air gap is equal everywhere and cancels each other out. However, assuming the motor rotates and the bearing fails, a deviation in the symmetrical air gap will inevitably occur. In this case, the permanent magnet rotor will be attracted to the side with the smaller air gap. The back electromotive force (EMF) of the parallel branch on the side with the smaller air gap will increase, and the current will decrease. Conversely, the back EMF of the parallel branch on the side with the larger air gap will decrease, and the current will increase. Therefore, the radial tension on the side with the larger air gap will increase, and the radial tension on the side with the smaller air gap will decrease. This will inevitably cause the air gap to shift in the direction of decreasing deviation and stabilize the air gap deviation. Therefore, once the motor starts rotating, it possesses the ability to radially and naturally magnetically levitate and realign.

[0048] Stator core segment gap λ d = (1~2)δ, where δ is the electromagnetic air gap of the motor, and λ is the segment gap of the rotor core. r =λd The rotor core segments at both ends of the rotor axis have a slightly larger gap, which is: λ rd =(1.5~2)λ r =(1.5~2)λ d .

[0049] This implementation method can increase its power capacity through modular series connection. By individually adjusting the rotational speed of each module, pressure, flow rate, and power can be automatically adjusted. By individually adjusting the rotational speed and phase difference of each module, fluid synthesis can be achieved, thus suppressing vibration and noise. Doubling the number of series modules doubles the pressure and flow rate, and doubles the power capacity; using more stages of modules can achieve even greater pressure, flow rate, and power capacity.

[0050] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A natural electromagnetic magnetic levitation ducted electric motor system, characterized by, Including two stator drive controller (1) and fan blade (2), two stator drive controller (1) coaxial in the two sides of fan blade (2), Stator drive controller (1) includes stator winding (101), annular stator core (102) and 4 pole ring fan-shaped permanent magnet (103), the stator core (102) is evenly divided into 6 segments along the circumference and is respectively as the six magnetic poles of the stator core (102), the stator winding (101) is wound on six magnetic poles, the stator winding (101) is three-phase and two windings in each phase are mirror-symmetrically arranged and are parallelly connected with each other, the main blade of fan blade (2) is concentrically located in the annular ring surrounded by 4-pole permanent magnet (103), and the annular ring surrounded by 4-pole permanent magnet (103) is located between the stator cores (102) of two stator drive controllers (1). U-phase mirror-symmetric two windings are parallelly connected, and tail ends are connected to three-phase winding midpoints to form a parallel branch of U-phase winding; V-phase mirror-symmetric two windings are parallelly connected, and tail ends are connected to three-phase winding midpoints to form a parallel branch of V-phase winding; W-phase mirror-symmetric two windings are parallelly connected, and tail ends are connected to three-phase winding midpoints to form a parallel branch of W-phase winding, and U, V and W three-phase windings each have a mirror-symmetric parallel branch.

2. The natural electromagnetic maglev ducted electric machine system of claim 1, wherein, It also includes a shell (3), and two stator drive controllers (1) and fan blade (2) are located inside the shell (3), The shell (3) is a cylindrical cavity structure, both end faces of the cylindrical cavity structure are provided with circular holes with equal diameters and coaxial, and the circular holes are coaxially arranged with the inner diameter of the stator core (102).

3. The natural electromagnetic maglev ducted electric machine system of claim 1 or 2, wherein, The fan blade (2) further includes an annular auxiliary wing blade, and the auxiliary wing blade is coaxially located on the outer circumference of the main blade.

4. A natural electromagnetic magnetically levitated ducted electric machine system characterized by, It includes a stator drive controller (1) and a vortex blade (5), and the stator drive controller (1) is coaxially sleeved on the outer circumference of the vortex blade (5), The stator drive controller (1) includes a stator winding (101), a stator core (102) and a surface-mounted permanent magnet (103), the stator winding (101) is wound in the stator slot of the inner ring of the stator core (102), the stator winding (101) is a three-phase winding, each phase winding includes at least one pair of center-symmetrically arranged winding pairs, the center of symmetry of the center-symmetrically arranged winding pairs is the center of the stator core (102), and the permanent magnet (103) is arranged on the outer circumference of the vortex blade (5); The stator winding (101) is divided into four groups of windings which are distributed in the center of the circumference, each group has three adjacent windings, the windings are connected in series at the tail ends, and the three adjacent windings are connected in series to form a branch, each group of three adjacent windings is connected in series at the tail ends, and the three adjacent windings are connected in series to form a branch; two symmetric branches formed by the two groups of windings which are distributed in the center of the circumference are connected into parallel branch windings; when the number of pole pairs is even, the two parallel branch windings are connected in parallel at the first-end and tail-end different-name ends; when the number of pole pairs is odd, the two parallel branch windings are connected in parallel at the first-first and tail-tail same-name ends, and one end of the two parallel branch windings serves as the midpoint of the phase winding.

5. The natural electromagnetic maglev ducted electric machine system of claim 4, wherein, Also include a shell (3) and base (4), the stator drive controller (1) and fan blade (2) are located inside the shell (3), The shell (3) is a cylindrical cavity structure, both ends of the cylindrical cavity structure are provided with circular holes with equal diameter and coaxial, the circular holes are equal in diameter and coaxial with the inner diameter of the stator core (102), The side wall of the shell (3) is fixed on the base (4).

6. The natural electromagnetic maglev ducted electric machine system of claim 4 or 5, wherein, The stator core (102) and permanent magnet (103) are evenly divided into multiple segments along the axial direction.

7. The natural electromagnetic maglev ducted electric machine system of claim 2 or 5, wherein, The material of the shell (3) is one or more of engineering plastics and non-magnetic metal materials; the material of the permanent magnet (103) is one or more of sintered Nd-Fe-B and bonded Nd-Fe-B.

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