Disc-type magnetic levitation motor

Abstract

The application discloses a disc type magnetic suspension motor, wherein a rotor assembly comprises a rotor shell and a first permanent magnet ring, a rotor core ring and a second permanent magnet ring; a stator assembly comprises a stator shell and a suspension module, a driving rotation module and a displacement sensor, the suspension module comprises a plurality of first cores, a plurality of suspension coils, a first magnetic conducting disc and a stator permanent magnet ring; the driving rotation module comprises a plurality of second cores, a plurality of driving coils and a second magnetic conducting disc; the stator permanent magnet ring is arranged correspondingly to the first permanent magnet ring, and the first permanent magnet ring and the stator permanent magnet ring form a reinforced magnetic circuit system; the rotor core ring, the second permanent magnet ring, the first core, the suspension coil and the first magnetic conducting disc form a suspension magnetic circuit system; and the rotor core ring, the second permanent magnet ring, the second core, the driving coil and the second magnetic conducting disc form a driving rotation magnetic circuit system. The technical scheme of the application greatly improves the suspension stability of the rotor assembly.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a disc-type magnetic levitation motor. Background Technology

[0002] Traditional electric motors consist of a stator and a rotor, connected by mechanical bearings or in mechanical contact. This results in mechanical friction during rotor movement. This friction not only increases frictional resistance, causing wear on moving parts, generating mechanical vibration and noise, but also leads to component overheating, deterioration of lubricant performance, and in severe cases, uneven air gap, winding overheating, and increased temperature rise, ultimately reducing motor efficiency and shortening its lifespan. Magnetic levitation motors, on the other hand, utilize the principle of "like poles repel, unlike poles attract" between the excitation magnetic fields of the stator and rotor to levitate the rotor, generating a driving force that propels the rotor in this levitated state. Therefore, there is no mechanical contact between the stator and rotor, allowing for higher acceleration and deceleration, less mechanical wear, easier mechanical and motor protection, and convenient maintenance, repair, and replacement. This makes them suitable for harsh environments, extremely clean and pollution-free applications, and special needs.

[0003] However, the rotor suspension stability of existing magnetic levitation motors still needs to be improved, so there is an urgent need to propose a magnetic levitation motor with better suspension stability. Summary of the Invention

[0004] The main objective of this invention is to propose a disc-type magnetic levitation motor, which aims to improve the levitation stability of the rotor assembly by improving the levitation structure of the stator assembly and the rotor assembly.

[0005] To achieve the above objectives, the disc-type magnetic levitation motor proposed in this invention includes:

[0006] The rotor assembly includes a rotor housing and a first permanent magnet ring, a rotor core ring, and a second permanent magnet ring arranged coaxially from top to bottom vertically within the rotor housing.

[0007] The stator assembly includes a stator housing and a suspension module, a drive rotation module, and a displacement sensor disposed within the stator housing. The displacement sensor is used to detect the radial offset of the rotor assembly, wherein:

[0008] The levitation module includes: multiple first iron cores, multiple levitation coils, a first conductive disk, and a stator permanent magnet ring. The first iron cores are arranged vertically and their lower ends are fixed to the first conductive disk. The multiple first iron cores are distributed at intervals along the circumference of the first conductive disk to enclose an upward-open receiving area in the space above the first conductive disk. Each first iron core is wound with a corresponding levitation coil, and the levitation coil is connected to the displacement sensor.

[0009] The drive rotation module is located in the lower space of the accommodating area. The drive rotation module includes multiple second iron cores, multiple drive coils, and a second guide disk. The second iron cores are arranged vertically and their lower ends are abutted and fixed to the second guide disk. The multiple second iron cores are distributed at intervals along the circumference of the second guide disk. Each second iron core is wound with a corresponding drive coil.

[0010] The rotor assembly is located in the upper space of the accommodating area. The stator permanent magnet ring is arranged corresponding to the first permanent magnet ring. The first permanent magnet ring and the stator permanent magnet ring constitute a reinforced magnetic circuit system to enhance the axial levitation force of the rotor assembly. The rotor core ring, the second permanent magnet ring, the first iron core, the levitation coil, and the first conductive disk constitute a levitation magnetic circuit system to levitate the rotor assembly within the accommodating area. The rotor core ring, the second permanent magnet ring, the second iron core, the drive coil, and the second conductive disk constitute a drive rotation magnetic circuit system to drive the rotor assembly to rotate within the accommodating area.

[0011] Preferably, the second conductive disk is fixed on the first conductive disk, and a barrier is provided between the second conductive disk and the first conductive disk to obstruct the conduction of magnetic lines of force.

[0012] Preferably, the second permanent magnet ring is composed of a plurality of permanent magnet columns extending vertically, the upper ends of the permanent magnet columns being fixed to the rotor core ring along the lower end face of the rotor core ring, and the plurality of permanent magnet columns being distributed at intervals along the circumference of the rotor core ring;

[0013] The permanent magnet column is magnetized axially, and the magnetization directions of two adjacent permanent magnet columns are opposite.

[0014] Preferably, when the drive coil adopts a two-phase control method, the number of drive coils is 2×N, where N is a natural number; or

[0015] When the drive coil adopts a three-phase control method, the number of drive coils is 3×N, where N is a natural number.

[0016] Preferably, the first iron core includes an iron core rod and a magnetic yoke, the magnetic yoke extending horizontally from the top end of the iron core rod and being arranged toward the axial direction of the stator assembly, and the bottom of the iron core rod being inserted and fixed to the first guide disk.

[0017] When the rotor assembly is suspended within the accommodating area, the magnetic yoke and the rotor core ring are arranged in a corresponding manner.

[0018] Preferably, the stator housing includes: an upper end cover, a housing, and a lower end cover. The housing is cylindrical and has open ends. The upper end cover is installed at the upper port of the housing, and the lower end cover is installed at the lower port of the housing.

[0019] The upper end cover has a downwardly recessed cavity in the middle corresponding to the receiving area, so that the rotor assembly can be movably received in the receiving cavity; the drive rotation module is located directly below the receiving cavity.

[0020] Preferably, the lower side of the upper end cover is provided with a fixing groove for accommodating and fixing the stator permanent magnet ring.

[0021] Preferably, the displacement sensor is an eddy current sensor, which extends horizontally and is positioned toward the axis of the stator assembly;

[0022] When the rotor assembly is suspended in the accommodating area, the displacement sensor is positioned corresponding to the rotor core ring.

[0023] Preferably, the number of displacement sensors is four, and they are evenly spaced along the circumference of the stator assembly.

[0024] Preferably, the stator assembly further includes a vertically extending fixing plate located inside the stator housing, with the lower end of the fixing plate fixed to the first guide disk, and the fixing plate having mounting holes for the displacement sensor to pass through and be fixed.

[0025] The technical solution of this invention forms a levitation magnetic circuit system, a rotating magnetic circuit system, and a reinforced magnetic circuit system between the stator assembly and the rotor assembly. On the one hand, it enhances the levitation force (levitation stiffness) of the rotor assembly in the axial direction. On the other hand, it effectively suppresses the radial and axial displacement of the rotor assembly, thereby significantly improving the levitation stability of the rotor assembly. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment of the disc-type magnetic levitation motor of the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram showing the separation of the stator assembly and rotor assembly of a mid-disc magnetic levitation motor;

[0029] Figure 3 for Figure 1 Top view of a mid-disc magnetic levitation motor;

[0030] Figure 4 for Figure 3 Cross-sectional view of the mid-disc magnetic levitation motor along the PP line;

[0031] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0032] Figure 6 This is a schematic diagram of the closed magnetic circuit of the disc-type magnetic levitation motor of the present invention;

[0033] Figure 7 for Figure 2 A schematic diagram of the internal structure of the rotor assembly of a mid-disc magnetic levitation motor;

[0034] Figure 8 for Figure 2 A schematic diagram of the internal structure of the stator assembly of a mid-disc magnetic levitation motor;

[0035] Figure 9 This is a schematic diagram of the suspension structure of the disc-type magnetic levitation motor of the present invention;

[0036] Figure 10 for Figure 9 A schematic diagram of the suspension module and drive rotation module of the mid-disc magnetic levitation motor;

[0037] Figure 11 This is an exploded view of the internal structure of the rotor assembly of the disc-type magnetic levitation motor of the present invention.

[0038] Figure 12 for Figure 8 A schematic diagram of the structure of the upper end cover of the middle stator housing;

[0039] Figure 13 for Figure 9 Installation diagram of the displacement sensor.

[0040] Explanation of icon numbers:

[0041] 1 Disc-type magnetic levitation motor 201a Container cavity 10 Rotor assembly 201b Fixed slot 20 Stator assembly 202 chassis 100 Rotor housing 203 lower end cover 110 First permanent magnet ring 211 First Iron Core 120 Rotor core ring 211a Iron core rod 130 Second permanent magnet ring 211b Magnetic yoke 131 Permanent magnet column 212 Suspension coil 200 Stator housing 213 First disk 210 Suspension Module 214 Stator permanent magnet ring 220 Drive rotating module 221 Second iron core 230 Displacement sensor 222 drive coil 240 Fixed plate 223 Second disk 201 Top cover 241 Mounting holes

[0042] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0044] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0045] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0046] This invention proposes a disc-type magnetic levitation motor that can be applied to blood pumps in the medical field or other magnetic levitation motor application scenarios.

[0047] In one embodiment of the present invention, reference is made to... Figures 1 to 11 The disc-type magnetic levitation motor 1 includes:

[0048] The rotor assembly 10 includes a rotor housing 100 and a first permanent magnet ring 110, a rotor core ring 120, and a second permanent magnet ring 130 arranged coaxially from top to bottom vertically within the rotor housing 100.

[0049] The stator assembly 20 includes a stator housing 200 and a suspension module 210, a drive rotation module 220, and a displacement sensor 230 disposed within the stator housing 200. The displacement sensor 230 is used to detect the radial offset of the rotor assembly 10, wherein:

[0050] The levitation module 210 includes: multiple first iron cores 211, multiple levitation coils 212, a first magnetic disk 213, and a stator permanent magnet ring 214. The first iron cores 211 are arranged vertically and their lower ends are fixed to the first magnetic disk 213. The multiple first iron cores 211 are distributed circumferentially along the first magnetic disk 213 to enclose an upward-opening accommodating area in the upper space of the first magnetic disk 213. Each first iron core 211 is correspondingly wound with a levitation coil 212, and the levitation coil 212 is connected to the displacement sensor 230.

[0051] The drive rotation module 220 is located in the lower space of the accommodating area. The drive rotation module 220 includes multiple second iron cores 221, multiple drive coils 222, and a second guide disk 223. The second iron cores 221 are arranged vertically and their lower ends are abutted and fixed to the second guide disk 223. The multiple second iron cores 221 are distributed at intervals along the circumference of the second guide disk 223. Each second iron core 221 is wound with a corresponding drive coil 222.

[0052] The rotor assembly 10 is located in the upper space of the accommodating area. The stator permanent magnet ring 214 is set corresponding to the first permanent magnet ring 110. The first permanent magnet ring 110 and the stator permanent magnet ring 214 constitute a reinforced magnetic circuit system to enhance the axial levitation force of the rotor assembly 10. The rotor core ring 120, the second permanent magnet ring 130, the first iron core 211, the levitation coil 212 and the first guide disk 213 constitute a levitation magnetic circuit system to make the rotor assembly 10 levitate within the accommodating area. The rotor core ring 120, the second permanent magnet ring 130, the second iron core 221, the drive coil 222 and the second guide disk 223 constitute a drive rotation magnetic circuit system to drive the rotor assembly 10 to rotate within the accommodating area.

[0053] Specifically, the rotor assembly 10 is movably housed within the receiving area of ​​the stator assembly 20, and the interiors of the rotor assembly 10 and the stator assembly 20 are relatively isolated. For the rotor assembly 10, the outer diameters of the first permanent magnet ring 110, the rotor core ring 120, and the second permanent magnet ring 130 are preferably equal. Within the rotor housing 100, the first permanent magnet ring 110, the rotor core ring 120, and the second permanent magnet ring 130 are arranged in a vertically abutting configuration. For the stator assembly 20, it mainly includes a suspension module 210, a drive rotation module 220, and a displacement sensor 230. The main function of the suspension module 210 is to provide levitation force for the rotor assembly 10, and the main function of the drive rotation module 220 is to provide rotational driving force for the rotor assembly 10. Among them, the rotor core ring 120, the first iron core 211, the first conductive disk 213, the second iron core 221, and the second conductive disk 223 are all made of soft magnetic materials. They do not produce magnetic fields (magnetic lines of force) themselves and only play the role of transmitting magnetic lines of force in the magnetic circuit. The rotor core ring 120, the first iron core 211, the first conductive disk 213, the second iron core 221, and the second conductive disk 223 are made of soft iron with high magnetic permeability, A3 steel, and soft magnetic alloys, etc., or they can be formed by yoke iron made of stacked silicon steel sheets. No specific limitation is made here.

[0054] When the levitation coil 212 is energized, it generates a levitation magnetic field. The magnetic lines of force generated by the levitation coil 212 are conducted along the first iron core 211 and the first magnetic disk 213. At this time, the rotor iron core ring 120, the second permanent magnet ring 130, the first iron core 211, the levitation coil 212 and the first magnetic disk 213 constitute a closed levitation magnetic circuit system, which in turn makes the rotor assembly 10 levitate within the accommodating area. It should be noted that in this scheme, when the rotor assembly 10 is in a suspended state, the stator permanent magnet ring 214 is positioned corresponding to the first permanent magnet ring 110, both at the same horizontal height. Both the first permanent magnet ring 110 and the stator permanent magnet ring 214 are axially magnetized, and their magnetization directions are opposite. Consequently, the first permanent magnet ring 110 and the stator permanent magnet ring 214 form a closed, reinforced magnetic circuit system, which enhances the axial levitation force (levitation stiffness) of the rotor assembly 10. When the rotor assembly 10 deviates axially (vertically), according to the principle of minimum magnetic reluctance, the first permanent magnet ring 110 and the stator permanent magnet ring 214 generate opposite axial magnetic pulls, thereby restoring the rotor assembly 10 to its original suspended position. In this way, the axial deviation of the rotor assembly 10 can be effectively suppressed, thereby significantly improving the levitation stability of the rotor assembly 10 in a suspended state.

[0055] When the levitation coil 212 and the drive coil 222 are simultaneously energized, the rotor assembly 10 is in a levitation state. The magnetic lines of force generated by the drive coil 222 are conducted along the second iron core 221 and the second magnetic disk 223. The rotor iron core ring 120, the second permanent magnet ring 130, the second iron core 221, the drive coil 222, and the second magnetic disk 223 form a closed driving rotation magnetic circuit system, thus allowing the rotor assembly 10 to rotate while remaining levitation. The working principle of the drive coil 222 driving the rotor assembly 10 to rotate is similar to that of a permanent magnet synchronous motor, and will not be elaborated here. It should be noted that the levitation coil 212 and the drive coil 222 operate independently. The magnitude, frequency, and waveform of the current flowing through the levitation coil 212 and the drive coil 222 are different, thereby avoiding magnetic field coupling between the generated levitation magnetic field and the driving rotation magnetic field.

[0056] During the levitation process of rotor assembly 10, when rotor assembly 10 shifts radially (horizontally), it causes a change in the signal of displacement sensor 230. The shift signal detected by displacement sensor 230 is transmitted to levitation coil 212 through processing unit (including but not limited to amplification circuit, comparison circuit, etc.), thereby adjusting the current parameters of levitation coil 212, disrupting the original levitation magnetic field balance state, generating Maxwell pull force opposite to the radial shift direction, and restoring rotor assembly 10 to the original levitation position.

[0057] The technical solution of the present invention forms a levitation magnetic circuit system, a rotating magnetic circuit system, and a reinforced magnetic circuit system between the stator assembly 20 and the rotor assembly 10. On the one hand, it enhances the levitation force (levitation stiffness) of the rotor assembly 10 in the axial direction. On the other hand, it effectively suppresses the radial and axial displacement of the rotor assembly 10, thereby significantly improving the levitation stability of the rotor assembly 10.

[0058] In this embodiment, the second magnetic disk 223 is detachably fixed to the first magnetic disk 213 (e.g., by screws, clips, etc.). To further suppress the coupling of the magnetic fields generated by the levitation coil 212 and the drive coil 222, a barrier (not shown) is provided between the second magnetic disk 223 and the first magnetic disk 213 to impede the conduction of magnetic lines of force. This barrier can be made of aluminum or other non-magnetic materials (e.g., plastic, ceramic materials), thereby preventing direct contact between the second magnetic disk 223 and the first magnetic disk 213, thus blocking the conduction of magnetic lines of force within them. Of course, in some modified embodiments, the barrier can also be implemented by forming a coating on the surface of the second magnetic disk 223 and / or the first magnetic disk 213; this is not specifically limited here.

[0059] Furthermore, regarding the second permanent magnet ring 130 of the aforementioned rotor assembly 10, the second permanent magnet ring 130 can specifically be composed of a plurality of vertically extending permanent magnet columns 131. The upper ends of the permanent magnet columns 131 are fixed to the rotor core ring 120 along the lower end face of the rotor core ring 120, and the plurality of permanent magnet columns 131 are distributed circumferentially at intervals along the rotor core ring 120. The magnetization direction of the permanent magnet columns 131 is axial magnetization, and the magnetization directions of two adjacent permanent magnet columns 131 are opposite. The number of permanent magnet columns 131 is an even number, preferably eight, and they are evenly spaced. Of course, in other embodiments, the second permanent magnet ring 130 can also be composed of a plurality of permanent magnets of other shapes. The number of permanent magnets depends on the shape of the permanent magnets, but the number of permanent magnets is an even number, and at least two. The second permanent magnet ring 130 adopts the above structure. Its main function is to concentrate the magnetic field to the lower side of the second permanent magnet ring 130, thereby making it easier for the rotor assembly 10 to levitate and rotate under the action of the suspension module 210 and the drive suspension module 210.

[0060] It is understandable that the drive coil 222 of the driving suspension module 210 can adopt a two-phase control or a three-phase control method. Specifically, when the drive coil 222 adopts a two-phase control method, the number of drive coils 222 is 2×N, where N is a natural number (N≥1), that is, the number of drive coils 222 can be 2, 4, 6, 8...; when the drive coil 222 adopts a three-phase control method, the number of drive coils 222 is 3×N, where N is a natural number (N≥1), that is, the number of drive coils 222 can be 3, 6, 9...

[0061] Furthermore, the first iron core 211 includes an iron core rod 211a and a magnetic yoke 211b. The magnetic yoke 211b extends horizontally from the top of the iron core rod 211a and is positioned towards the axis of the stator assembly 20. The bottom of the iron core rod 211a is inserted and fixed to the first guide disk 213. When the rotor assembly 10 is suspended in the receiving area, the magnetic yoke 211b is correspondingly positioned with the rotor iron core ring 120. The magnetic yoke 211b plays the role of conducting magnetic lines of force in the magnetic circuit, thereby facilitating the formation of a suspended magnetic circuit system.

[0062] Reference Figure 2 , Figure 4 , Figure 8 as well as Figure 12In this embodiment, the stator housing 200 includes an upper end cover 201, a housing 202, and a lower end cover 203. The housing 202 is cylindrical with open ends. The upper end cover 201 is installed at the upper port of the housing 202, and the lower end cover 203 is installed at the lower port of the housing 202. The upper end cover 201 has a downwardly recessed receiving cavity 201a in the middle of the receiving area, so that the rotor assembly 10 can be movably received in the receiving cavity 201a. The drive rotation module 220 is located directly below the receiving cavity 201a. The upper end cover 201 and the lower end cover 203 are detachably connected to seal the upper and lower ports of the housing 202, thereby enclosing both the suspension module 210 and the drive suspension module 210 within the stator housing 200. In addition, the lower side of the upper end cover 201 may be provided with a fixing groove 201b for accommodating and fixing the stator permanent magnet ring 214, thereby fixing the stator permanent magnet ring 214 at the upper end cover 201. At this time, the stator permanent magnet ring 214 is circumferentially wrapped around the outside of the accommodating cavity 201a. When the rotor assembly 10 is suspended in the accommodating cavity 201a, the stator permanent magnet ring 214 can be at the same horizontal height as the first permanent magnet ring 110 of the rotor assembly 10, thereby facilitating the formation of a closed reinforced magnetic circuit system.

[0063] Furthermore, the displacement sensor 230 is an eddy current sensor, which extends horizontally and is positioned towards the axis of the stator assembly 20. When the rotor assembly 10 is suspended in the receiving area, the displacement sensor 230 is positioned corresponding to the rotor core ring 120. The detection surface of the displacement sensor 230 is positioned towards the outer peripheral surface of the rotor assembly 10, so that when the rotor assembly 10 undergoes radial displacement, the displacement sensor 230 generates a corresponding electrical signal.

[0064] The number of displacement sensors 230 is multiple. Specifically, two displacement sensors 230 are distributed circumferentially along the stator assembly 20 and on the same horizontal plane, with a 90-degree angle between them. This improves the sensitivity and accuracy of the displacement sensors 230 in detecting the radial offset of the rotor assembly 10. Alternatively, at least three displacement sensors 230 are used, with multiple sensors on the same horizontal plane and evenly distributed circumferentially along the stator assembly 20. For example, there can be three (or six) displacement sensors distributed at 120-degree (or 60-degree) intervals. As a preferred embodiment, referring to... Figure 9 , Figure 10 as well as Figure 13 In this embodiment, the number of displacement sensors 230 is preferably four. At this time, two displacement sensors 230 correspond to a group to form a differential circuit system, thereby further improving the detection sensitivity and accuracy of the displacement sensors 230 for the radial offset of the rotor assembly 10.

[0065] To facilitate fixing the displacement sensor 230, in this embodiment, refer to... Figure 13 The stator assembly 20 also includes a vertically extending fixing plate 240. The fixing plate 240 is located inside the stator housing 200, and the lower end of the fixing plate 240 is fixed to the first guide disk 213. The fixing plate 240 is provided with a mounting hole 241 for the displacement sensor 230 to pass through and be fixed, so that the displacement sensor 230 is fixed through and fixed to the fixing plate 240, and the detection surface of the displacement sensor 230 is kept facing the axial direction of the stator assembly 20.

[0066] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A disc-type magnetic levitation motor, characterized in that, include: The rotor assembly includes a rotor housing and a first permanent magnet ring, a rotor core ring, and a second permanent magnet ring arranged coaxially from top to bottom vertically within the rotor housing. The stator assembly includes a stator housing and a suspension module, a drive rotation module, and a displacement sensor disposed within the stator housing. The displacement sensor is used to detect the radial offset of the rotor assembly, wherein: The levitation module includes: multiple first iron cores, multiple levitation coils, a first conductive disk, and a stator permanent magnet ring. The first iron cores are arranged vertically and their lower ends are fixed to the first conductive disk. The multiple first iron cores are distributed at intervals along the circumference of the first conductive disk to enclose an upward-open receiving area in the space above the first conductive disk. Each first iron core is wound with a corresponding levitation coil, and the levitation coil is connected to the displacement sensor. The drive rotation module is located in the lower space of the accommodating area. The drive rotation module includes multiple second iron cores, multiple drive coils, and a second guide disk. The second iron cores are arranged vertically and their lower ends are abutted and fixed to the second guide disk. The multiple second iron cores are distributed at intervals along the circumference of the second guide disk. Each second iron core is wound with a corresponding drive coil. The rotor assembly is located in the upper space of the accommodating area. The stator permanent magnet ring is arranged corresponding to the first permanent magnet ring. The first permanent magnet ring and the stator permanent magnet ring constitute a reinforced magnetic circuit system to enhance the axial levitation force of the rotor assembly. The rotor core ring, the second permanent magnet ring, the first iron core, the levitation coil, and the first conductive disk constitute a levitation magnetic circuit system to levitate the rotor assembly within the accommodating area. The rotor core ring, the second permanent magnet ring, the second iron core, the drive coil, and the second conductive disk constitute a drive rotation magnetic circuit system to drive the rotor assembly to rotate within the accommodating area.

2. The disc-type magnetic levitation motor as described in claim 1, characterized in that, The second guide disk is fixed on the first guide disk, and a barrier is provided between the second guide disk and the first guide disk to prevent the conduction of magnetic lines of force.

3. The disc-type magnetic levitation motor as described in claim 1, characterized in that, The second permanent magnet ring is composed of a plurality of permanent magnet columns extending vertically. The upper end of the permanent magnet column is fixed to the rotor core ring along the lower end face of the rotor core ring, and the plurality of permanent magnet columns are distributed at intervals along the circumference of the rotor core ring. The permanent magnet column is magnetized axially, and the magnetization directions of two adjacent permanent magnet columns are opposite.

4. The disc-type magnetic levitation motor as described in claim 1, characterized in that, When the drive coil adopts a two-phase control method, the number of drive coils is 2×N, where N is a natural number; or When the drive coil adopts a three-phase control method, the number of drive coils is 3×N, where N is a natural number.

5. The disc-type magnetic levitation motor as described in claim 1, characterized in that, The first iron core includes an iron core rod and a magnetic yoke. The magnetic yoke extends horizontally from the top of the iron core rod and is oriented toward the axis of the stator assembly. The bottom of the iron core rod is inserted and fixed to the first guide disk. When the rotor assembly is suspended within the accommodating area, the magnetic yoke and the rotor core ring are arranged in a corresponding manner.

6. The disc-type magnetic levitation motor as described in claim 1, characterized in that, The stator housing includes: an upper end cover, a housing, and a lower end cover. The housing is cylindrical and has open ends. The upper end cover is installed at the upper port of the housing, and the lower end cover is installed at the lower port of the housing. The upper end cover has a downwardly recessed cavity in the middle corresponding to the receiving area, so that the rotor assembly can be movably received in the receiving cavity; the drive rotation module is located directly below the receiving cavity.

7. The disc-type magnetic levitation motor as described in claim 6, characterized in that, The lower side of the upper end cover is provided with a fixing groove for accommodating and fixing the stator permanent magnet ring.

8. The disc-type magnetic levitation motor as described in any one of claims 1 to 7, characterized in that, The displacement sensor is an eddy current sensor, which extends horizontally and is positioned toward the axis of the stator assembly. When the rotor assembly is suspended in the accommodating area, the displacement sensor is positioned corresponding to the rotor core ring.

9. The disc-type magnetic levitation motor as described in claim 8, characterized in that, The number of displacement sensors is four, and they are evenly spaced along the circumference of the stator assembly.

10. The disc-type magnetic levitation motor as described in claim 8, characterized in that, The stator assembly also includes a vertically extending fixing plate located inside the stator housing, with the lower end of the fixing plate fixed to the first guide disk. The fixing plate is provided with mounting holes for the displacement sensor to pass through and be fixed.

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