Magnetic levitation motor

Abstract

The present invention discloses a magnetic levitation motor comprising a rotor assembly and a stator assembly. The rotor assembly includes a rotor housing, a first permanent magnet ring, a first core ring, a second permanent magnet ring, and a second core ring, which are coaxially arranged within the rotor housing. The stator assembly includes a stator housing, a stator permanent magnet ring, a stator core ring, a magnetic guide disk, a displacement sensor, and multiple coil windings, all of which are located within the stator housing. The top center of the stator housing has a downwardly recessed accommodating cavity. The coil windings include a vertically extending stator core, a levitation coil, and a drive coil. The levitation coil, stator core, magnetic guide disk, second core ring, and second permanent magnet ring form a levitation magnetic circuit system. The stator permanent magnet ring, stator core ring, first permanent magnet ring, and first core ring form a reinforced magnetic circuit system. The drive coil, stator core, magnetic guide disk, second core ring, and second permanent magnet ring form a rotating magnetic circuit system. The technical solution of the present invention significantly improves the levitation stability of the rotor assembly.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a magnetic levitation motor. Background Art

[0002] Traditional motors consist of a stator and a rotor, connected by mechanical bearings or mechanical contact. Consequently, mechanical friction occurs during rotor motion. This friction not only increases the rotor's frictional resistance, causing wear on moving parts and generating mechanical vibration and noise, but also causes component heating, degrading lubricant performance. In severe cases, this can lead to uneven air gaps in the motor, heating the windings, and increasing temperature rise, thus reducing motor efficiency and shortening its lifespan. Magnetic levitation motors utilize the principle of "like charges repel, opposite charges attract" between the stator and rotor excitation magnetic fields to levitate the rotor, while simultaneously generating a propulsive force to propel the rotor in suspension. As a result, there is no mechanical contact between the stator and rotor, resulting in higher acceleration and deceleration, minimal mechanical wear, easier mechanical and motor protection, and convenient maintenance, overhaul, and replacement. These motors are suitable for harsh environments, extremely clean and pollution-free environments, and specialized applications.

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

[0004] The main purpose of the present invention is to provide a magnetic levitation motor, which aims to improve the suspension stability of the rotor assembly by improving the suspension structure of the stator assembly and the rotor assembly.

[0005] To achieve the above-mentioned object, the magnetic levitation motor proposed in the present invention comprises:

[0006] The rotor assembly includes a rotor housing, and a first permanent magnet ring, a first core ring, a second permanent magnet ring, and a second core ring coaxially arranged within the rotor housing, wherein the first permanent magnet ring and the first core ring are located above the second core ring, and the second permanent magnet ring is arranged around the outer circumference of the second core ring;

[0007] A stator assembly comprises a stator housing and a stator permanent magnet ring, a stator core ring, a guide disk, a displacement sensor, and a plurality of coil windings disposed within the stator housing. The top center of the stator housing has a downwardly recessed accommodating cavity. The coil winding comprises a vertically extending stator core, a suspension coil, and a drive coil. The suspension coil and the drive coil are respectively vertically sleeved on the stator core, and the plurality of coil windings are evenly distributed circumferentially around the accommodating cavity. The stator permanent magnet ring and the stator core ring are both disposed above the stator core and surround the accommodating cavity. The lower end of the stator core is abutted and fixed to the guide disk. The suspension coil and the drive coil are located on the side of the guide disk facing the accommodating cavity.

[0008] The rotor assembly is movably accommodated in the accommodating cavity. The displacement sensor is used to detect radial displacement of the rotor assembly in the accommodating cavity. The suspension coil is connected to the displacement sensor. The suspension coil, the stator core, the guide magnetic disk, the second core ring, and the second permanent magnet ring constitute a suspension magnetic circuit system to suspend the rotor assembly in the accommodating cavity. The stator permanent magnet ring, the stator core ring, the first permanent magnet ring, and the first core ring constitute a reinforcement magnetic circuit system to enhance the axial suspension force of the rotor assembly. The drive coil, the stator core, the guide magnetic disk, the second core ring, and the second permanent magnet ring constitute a rotating magnetic circuit system to rotate the rotor assembly in the accommodating cavity.

[0009] Preferably, the second permanent magnet ring includes a plurality of pairs of sector-shaped permanent magnet tiles arranged at intervals along the outer circumference of the second core ring, each pair of sector-shaped permanent magnet tiles is symmetrically distributed along the axis of the rotor assembly, the magnetization direction of each sector-shaped permanent magnet tile is radial magnetization, and the magnetization directions of adjacent sector-shaped permanent magnet tiles are opposite.

[0010] Preferably, a sector-shaped blocking block is filled and fixed between two adjacent sector-shaped permanent magnetic tiles, and the sector-shaped blocking block and the sector-shaped permanent magnetic tiles are sequentially spliced ​​to form a closed circular ring.

[0011] Preferably, the second permanent magnet ring is an annular magnetic ring that adopts radial outward magnetization and outer diameter multi-pole magnetization, and the magnetization directions of the annular magnetic ring are alternately and oppositely arranged in its circumferential direction.

[0012] Preferably, the rotor assembly further includes a spacer ring, and the first permanent magnet ring, the first core ring, the spacer ring, and the second permanent magnet ring are vertically abutted and arranged in sequence from top to bottom in the rotor housing.

[0013] Preferably, the stator assembly further comprises a fixed disk, and the upper end of the stator core is plugged and fixed to the fixed disk;

[0014] Both the levitation coil and the driving coil are located between the fixed disk and the conductive disk.

[0015] Preferably, the stator core comprises an iron core rod and a yoke portion, wherein the yoke portion extends horizontally from the top end of the iron core rod and is arranged toward the axis direction of the stator assembly;

[0016] The yoke portion is arranged corresponding to the second permanent magnet ring.

[0017] Preferably, the displacement sensor is located at the gap formed by the stator permanent magnet ring and the stator core, the displacement sensor is an eddy current sensor, and the displacement sensor extends horizontally and is arranged toward the axis of the stator assembly.

[0018] Preferably, the number of the displacement sensors is two, and the two displacement sensors are distributed along the circumference of the stator assembly and in the same horizontal plane, and the two displacement sensors are distributed at an angle of 90 degrees.

[0019] Preferably, the number of the displacement sensors is at least three, and the multiple displacement sensors are in the same horizontal plane and are evenly distributed at intervals along the circumference of the stator assembly.

[0020] The technical solution of the present invention forms a suspension magnetic circuit system, a rotating magnetic circuit system, and a strengthened magnetic circuit system between the stator assembly and the rotor assembly. On the one hand, it enhances the axial suspension force (suspension stiffness) of the rotor assembly, and on the other hand, it effectively suppresses the radial and axial deviations of the rotor assembly, thereby greatly improving the suspension stability of the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 This is a schematic structural diagram of an embodiment of a magnetic levitation motor according to the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the separation of the rotor assembly and stator assembly of the magnetic levitation motor;

[0024] Figure 3 for Figure 2 Schematic diagram of the internal structure of the rotor assembly and stator assembly of the magnetic levitation motor;

[0025] Figure 4 for Figure 3 Internal structure diagram of the middle rotor assembly;

[0026] Figure 5 for Figure 4 Schematic diagram of the structure and magnetic pole distribution of the second permanent magnet ring of the middle rotor assembly;

[0027] Figure 6 A schematic structural diagram and a schematic magnetic pole distribution diagram of another embodiment of the second permanent magnet ring of the magnetic levitation motor of the present invention;

[0028] Figure 7 for Figure 3 Internal structure diagram of the stator assembly;

[0029] Figure 8 for Figure 7 Schematic diagram of the internal structure cross section of the stator assembly;

[0030] Figure 9 for Figure 1 Schematic diagram of the internal structure of the magnetic levitation motor;

[0031] Figure 10 for Figure 9 A partial enlarged view of point A in the middle;

[0032] Figure 11 for Figure 9 Schematic diagram of the magnetic circuit system of the magnetic levitation motor;

[0033] Figure 12 for Figure 9 Schematic diagram of the displacement sensor of the magnetic levitation motor;

[0034] Figure 13 for Figure 7 Schematic diagram of the installation of the coil winding, fixed disk and guide disk of the magnetic levitation motor.

[0035] Description of Figure Numbers:

[0036] Label name Label name 1 Magnetic levitation motor 210 stator permanent magnet ring 10 rotor assembly 220 stator core ring 20 stator assembly 230 Displacement Sensor 100 rotor housing 240 Coil winding 110 The first permanent magnet ring 241 stator core 120 First core ring 241a core rod 130 Second core ring 241b Yoke 140 Second permanent magnet ring 242 Suspension coil 141 Fan-shaped permanent magnetic tiles 243 Drive coil 142 Sector-shaped spacer 250 Fixed disk 150 Spacer ring 260 Guide Disk 200 stator housing 270 Mounting ring 201 Accommodation cavity

[0037] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] The present invention proposes a magnetic levitation motor that can be used for a blood pump in the medical field or in other magnetic levitation motor application scenarios.

[0042] In one embodiment of the present invention, referring to Figures 1 to 11 , the magnetic levitation motor 1 comprises:

[0043] The rotor assembly 10 includes a rotor housing 100 and a first permanent magnet ring 110, a first core ring 120, a second permanent magnet ring 140, and a second core ring 130 coaxially disposed within the rotor housing 100. The first permanent magnet ring 110 and the first core ring 120 are located above the second core ring 130, and the second permanent magnet ring 140 is disposed around the outer circumference of the second core ring 130.

[0044] The stator assembly 20 includes a stator housing 200 and a stator permanent magnet ring 210, a stator core ring 220, a guide disk 260, a displacement sensor 230, and a plurality of coil windings 240 disposed in the stator housing 200. The top center of the stator housing 200 has a downwardly concave accommodating cavity 201. The coil winding 240 includes a suspension coil 242, a drive coil 243, and a stator core 241 extending vertically. The suspension coil 242 and the drive coil 243 are arranged along the stator housing 200. The stator core 241 is vertically sleeved, with multiple coil windings 240 distributed circumferentially around the accommodating cavity 201. The stator permanent magnet ring 210 and the stator core ring 220 are both located above the stator core 241 and surround the accommodating cavity 201. The lower end of the stator core 241 is abutted and fixed to the conductive disk 260. The suspension coil 242 and the drive coil 243 are located on the side of the conductive disk 260 facing the accommodating cavity 201.

[0045] The rotor assembly 10 is movably accommodated within the accommodating cavity 201. The displacement sensor 230 is used to detect radial displacement of the rotor assembly 10 within the accommodating cavity 201. The suspension coil 242 is connected to the displacement sensor 230. The suspension coil 242, the stator core 241, the conductive magnetic disk 260, the second core ring 130, and the second permanent magnet ring 140 constitute a suspension magnetic circuit system to suspend the rotor assembly 10 within the accommodating cavity 201. The stator permanent magnet ring 210, the stator core ring 220, the first permanent magnet ring 110, and the first core ring 120 constitute a reinforcement magnetic circuit system to enhance the axial suspension force of the rotor assembly 10. The drive coil 243, the stator core 241, the conductive magnetic disk 260, the second core ring 130, and the second permanent magnet ring 140 constitute a rotating magnetic circuit system to rotate the rotor assembly 10 within the accommodating cavity 201.

[0046] Specifically, the rotor assembly 10 is located within the accommodating cavity 201 of the stator assembly 20, and the rotor assembly 10 is relatively isolated from the interior of the stator assembly 20. In the rotor assembly 10, the radial dimensions of the first permanent magnet ring 110, the first core ring 120, and the second permanent magnet ring 140 are preferably the same. The inner circumference of the second permanent magnet ring 140 abuts the outer circumference of the second core ring 130, and the outer circumference of the second permanent magnet ring 140 abuts the inner circumference of the rotor housing 100. This allows the second permanent magnet ring 140 to be clamped and fixed within the rotor housing 100. The first core ring 120, the second core ring 130, the stator core ring 220, the stator core 241, and the conductive disk 260 are all made of soft magnetic materials. They do not generate magnetic fields (magnetic lines of force) themselves and only serve to transmit magnetic lines of force in the magnetic circuit. The first core ring 120, the second core ring 130, the stator core ring 220, the stator core 241, and the conductive disk 260 are made of relatively high-permeability soft iron, A3 steel, or soft magnetic alloys. Alternatively, they can be formed from a yoke iron made of stacked silicon steel sheets. In the stator assembly 20, the lower ends of all stator cores 241 abut against the conductive disk 260, allowing the magnetic field generated by the suspension coils 242 and the drive coils 243 to be transmitted through the stator core 241 and the conductive disk 260, thereby concentrating the magnetic field generated by the suspension coils 242 and the drive coils 243 in the space above the conductive disk 260.

[0047] When the suspension coil 242 is energized, it generates a suspension magnetic field. The suspension coil 242, the stator core 241, the conductive magnetic disk 260, the second core ring 130, the conductive magnetic disk 260, and the second permanent magnet ring 140 form a closed magnetic circuit, i.e., a suspension magnetic circuit system. At this point, the rotor assembly 10 is subjected to the magnetic levitation force, causing it to remain suspended within the accommodating chamber 201. When both the suspension coil 242 and the drive coil 243 are energized simultaneously, the rotor assembly 10 is in a suspended state. The drive coil 243, the stator core 241, the conductive magnetic disk 260, the second core ring 130, and the second permanent magnet ring 140 form a closed magnetic circuit, i.e., a rotating magnetic circuit system, causing the rotor assembly 10 to levitate and rotate within the accommodating chamber 201. The operating principle of the drive coil 243 driving the rotor assembly 10 to rotate is similar to that of a permanent magnet synchronous motor and will not be described in detail here. It should be noted that the suspension coil 242 and the driving coil 243 work independently, and the current magnitude, frequency and waveform passed into the suspension coil 242 and the driving coil 243 are different, thereby avoiding magnetic field coupling between the generated suspension magnetic field and the driving rotating magnetic field.

[0048] During the levitation process of the rotor assembly 10, if the rotor assembly 10 deflects in the radial direction (horizontally), this causes a change in the signal of the displacement sensor 230. The deflection signal detected by the displacement sensor 230 is transmitted to the levitation coil 242 through a processing unit (including but not limited to an amplification circuit, a comparison circuit, etc.), thereby adjusting the current parameters of the levitation coil 242, disrupting the original equilibrium state of the levitation magnetic field, generating a Maxwell pull in the opposite direction of the radial deflection, and restoring the rotor assembly 10 to its original levitation position. The stator permanent magnet ring 210, stator core ring 220, first permanent magnet ring 110, and first core ring 120 form a closed magnetic circuit, creating a reinforced magnetic circuit system that enhances the axial suspension force (suspension stiffness) of the rotor assembly 10. When the rotor assembly 10 deflects axially (vertically), according to the principle of minimum magnetic resistance, the first permanent magnet ring 110 and first core ring 120 will generate an opposite axial magnetic pull relative to the stator permanent magnet ring 210 and stator core ring 220, thereby restoring the rotor assembly 10 to its original suspended position. This effectively suppresses both radial and axial deviations of the rotor assembly 10, significantly improving the suspension stability of the rotor assembly 10 in the suspended state.

[0049] It is understandable that, for the first permanent magnet ring 110 and the stator permanent magnet ring 210 , in order to form a closed magnetic circuit, the first permanent magnet ring 110 and the stator permanent magnet ring 210 are both axially magnetized, and the magnetization directions of the two are opposite.

[0050] The technical solution of the present invention forms a suspension magnetic circuit system, a rotating magnetic circuit system, and a strengthened magnetic circuit system between the stator assembly 20 and the rotor assembly 10. On the one hand, it enhances the axial suspension force (suspension stiffness) of the rotor assembly 10, and on the other hand, it effectively suppresses the radial and axial deviations of the rotor assembly 10, thereby greatly improving the suspension stability of the rotor assembly 10.

[0051] Furthermore, in this embodiment, referring to Figure 3 and Figure 4 , and combined with Figure 12The second permanent magnet ring 140 includes multiple pairs of sector-shaped permanent magnet tiles 141 spaced apart along the outer circumference of the second core ring 130. Each pair of sector-shaped permanent magnet tiles 141 is symmetrically distributed along the axis of the rotor assembly 10. Each sector-shaped permanent magnet tile 141 is magnetized radially, and adjacent sector-shaped permanent magnet tiles 141 have opposite magnetization directions. Thus, when the drive coil 243 is energized, a rotational driving force is generated between the second permanent magnet ring 140 and the drive coil 243, thereby driving the rotor assembly 10 to rotate within the accommodating cavity 201. The multiple sector-shaped permanent magnet tiles 141 are preferably evenly distributed along the outer circumference of the second core ring 130 so that the rotational driving force can uniformly drive the rotor assembly 10. Furthermore, with respect to the coil winding 240, the suspension coil 242 is preferably located below the drive coil 243, placing the drive coil 243 relatively close to the rotor assembly 10, thereby generating a stronger rotational driving force and better driving the rotor assembly 10 to rotate.

[0052] Continue to refer to Figure 3 and Figure 4 To facilitate the securing of the second permanent magnet ring 140, a sector-shaped spacer 142 is fixed between adjacent sector-shaped permanent magnet tiles 141. The sector-shaped spacer 142 and the sector-shaped permanent magnet tiles 141 are sequentially joined to form a closed circular ring. As a result, due to the presence of the sector-shaped spacer 142, both circumferential ends of the sector-shaped permanent magnet tiles 141 are abutted and fixed, thereby securing the sector-shaped permanent magnet tiles 141. It is understood that the sector-shaped permanent magnet tiles 141 are clamped and abutted between the inner circumferential surface of the rotor housing 100 and the outer circumferential surface of the second core ring 130.

[0053] It is worth noting that the second permanent magnet ring 140 has other deformation structures, see Figure 6 For example, the second permanent magnet ring 140 is an annular magnetic ring with radial outer magnetization and outer diameter multi-pole magnetization. The magnetization directions of the annular magnetic ring are alternately and oppositely arranged in its circumferential direction, and the number of magnetic poles of the annular magnetic ring is an even number.

[0054] Furthermore, the rotor assembly 10 also includes a baffle ring 150, and the first permanent magnet ring 110, the first core ring 120, the baffle ring 150, and the second permanent magnet ring 140 are arranged vertically in sequence from top to bottom in the rotor housing 100. By providing the baffle ring 150, the first core ring 120 and the second permanent magnet ring 140 can be prevented from contacting each other, thereby reducing magnetic circuit interference. And because the baffle ring 150 is provided, the first permanent magnet ring 110, the first core ring 120, the baffle ring 150, and the second permanent magnet ring 140 are all clamped and fixed between the upper and lower end surfaces of the rotor housing 100, thereby achieving the stability of the internal structure of the rotor assembly 10. It should be noted that the baffle ring 150 and the fan-shaped baffle block 142 can be made of plastic or ceramic parts, which will not affect the passage of magnetic lines of force, nor will it affect the conduction direction of magnetic lines of force.

[0055] Reference Figure 3 、 Figure 8 、 Figure 11 as well as Figure 13 The stator assembly 20 also includes a fixed disk 250 and a conductive disk 260. The upper end of the stator core 241 is inserted and fixed to the fixed disk 250. The suspension coil 242 and the drive coil 243 are both located between the fixed disk 250 and the conductive disk 260. The fixed disk 250 and the conductive disk 260 together secure the coil winding 240.

[0056] Further, refer to Figure 3 、 Figure 8 、 Figure 9 、 Figure 11 and Figure 13 The stator core 241 includes a core rod 241a and a yoke portion 241b. The yoke portion 241b extends horizontally from the top of the core rod 241a and is arranged in the direction of the axis of the stator assembly 20. The yoke portion 241b is arranged corresponding to the second permanent magnet ring 140. The yoke portion 241b plays a role in conducting magnetic lines of force in the magnetic circuit, thereby facilitating the formation of a suspended magnetic circuit system and a rotating magnetic circuit system.

[0057] In this embodiment, referring to Figures 7 to 11 Displacement sensor 230 is located in the gap formed by stator permanent magnet ring 210 and stator core 241. Displacement sensor 230 is an eddy current sensor and extends horizontally and is positioned toward the axis of stator assembly 20. The detection surface of displacement sensor 230 faces the outer circumference of rotor assembly 10. When rotor assembly 10 deflects radially, displacement sensor 230 generates a corresponding electrical signal.

[0058] Further, continue to refer to Figure 12 Two displacement sensors 230 are provided. These sensors are distributed circumferentially around the stator assembly 20 and within the same horizontal plane, with a 90-degree angle between them. This improves the sensitivity and accuracy of the displacement sensors 230 in detecting radial offset of the rotor assembly 10.

[0059] The aforementioned displacement sensors 230 may also be distributed in the following manner: at least three displacement sensors 230 are located in the same horizontal plane and evenly spaced along the circumference of the stator assembly 20. For example, there may be three (or six) displacement sensors 230 spaced 120 degrees (or 60 degrees) apart. A preferred embodiment is to use four displacement sensors 230, with two displacement sensors 230 forming a group to form a differential circuit system. This further improves the sensitivity and accuracy of the displacement sensors 230 in detecting radial offset of the rotor assembly 10.

[0060] In order to facilitate the installation of the fixed displacement sensor 230, in this embodiment, as shown in FIG. Figure 6 As shown, a mounting ring 270 is disposed between the stator permanent magnet ring 210 and the upper end of the stator core 241. Mounting ring 270 is clamped and secured between the stator permanent magnet ring 210 and the stator core 241. Mounting ring 270 is coaxial with stator permanent magnet ring 210 and has the same radial dimensions as stator permanent magnet ring 210. Mounting ring 270 has radially defined mounting holes for securing displacement sensor 230, thereby securing displacement sensor 230. The mounting ring can be made of plastic or ceramic and does not affect the passage or conduction direction of magnetic lines of force.

[0061] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A magnetic levitation motor, characterized in that: include: The rotor assembly includes a rotor housing, and a first permanent magnet ring, a first core ring, a second permanent magnet ring, and a second core ring coaxially arranged within the rotor housing, wherein the first permanent magnet ring and the first core ring are located above the second core ring, and the second permanent magnet ring is arranged around the outer circumference of the second core ring; A stator assembly comprises a stator housing and a stator permanent magnet ring, a stator core ring, a guide disk, a displacement sensor, and a plurality of coil windings disposed within the stator housing. The top center of the stator housing has a downwardly recessed accommodating cavity. The coil winding comprises a vertically extending stator core, a suspension coil, and a drive coil. The suspension coil and the drive coil are respectively vertically sleeved on the stator core, and the plurality of coil windings are evenly distributed circumferentially around the accommodating cavity. The stator permanent magnet ring and the stator core ring are both disposed above the stator core and surround the accommodating cavity. The lower end of the stator core is abutted and fixed to the guide disk. The suspension coil and the drive coil are located on the side of the guide disk facing the accommodating cavity. The rotor assembly is movably accommodated in the accommodating cavity. The displacement sensor is used to detect radial displacement of the rotor assembly in the accommodating cavity. The suspension coil is connected to the displacement sensor. The suspension coil, the stator core, the guide magnetic disk, the second core ring, and the second permanent magnet ring constitute a suspension magnetic circuit system to suspend the rotor assembly in the accommodating cavity. The stator permanent magnet ring, the stator core ring, the first permanent magnet ring, and the first core ring constitute a reinforcement magnetic circuit system to enhance the axial suspension force of the rotor assembly. The drive coil, the stator core, the guide magnetic disk, the second core ring, and the second permanent magnet ring constitute a rotating magnetic circuit system to rotate the rotor assembly in the accommodating cavity.

2. The magnetic levitation motor according to claim 1, characterized in that: The second permanent magnet ring includes multiple pairs of sector-shaped permanent magnet tiles arranged at intervals along the outer circumference of the second core ring, each pair of sector-shaped permanent magnet tiles is symmetrically distributed along the axis of the rotor assembly, the magnetization direction of each sector-shaped permanent magnet tile is radial magnetization, and the magnetization directions of adjacent sector-shaped permanent magnet tiles are opposite.

3. The magnetic levitation motor according to claim 2, characterized in that: A sector-shaped blocking block is filled and fixed between two adjacent sector-shaped permanent magnetic tiles, and the sector-shaped blocking block and the sector-shaped permanent magnetic tiles are sequentially spliced ​​to form a closed circular ring.

4. The magnetic levitation motor according to claim 1, characterized in that: The second permanent magnet ring is an annular magnetic ring that adopts radial outer magnetization and outer diameter multi-pole magnetization, and the magnetization directions of the annular magnetic ring are alternately and oppositely arranged in its circumferential direction.

5. The magnetic levitation motor according to claim 1, characterized in that: The rotor assembly further includes a baffle ring. The first permanent magnet ring, the first core ring, the baffle ring, and the second permanent magnet ring are vertically abutted and arranged in sequence from top to bottom in the rotor housing.

6. The magnetic levitation motor according to claim 1, characterized in that: The stator assembly further includes a fixed disk, and the upper end of the stator core is plugged and fixed to the fixed disk; Both the levitation coil and the driving coil are located between the fixed disk and the conductive disk.

7. The magnetic levitation motor according to claim 6, characterized in that: The stator core includes an iron core rod and a yoke portion, wherein the yoke portion extends horizontally from the top end of the iron core rod and is arranged toward the axis direction of the stator assembly; The yoke portion is arranged corresponding to the second permanent magnet ring.

8. The magnetic levitation motor according to any one of claims 1 to 7, characterized in that: The displacement sensor is located at the gap formed by the stator permanent magnet ring and the stator core. The displacement sensor is an eddy current sensor, and the displacement sensor extends horizontally and is arranged toward the axis of the stator assembly.

9. The magnetic levitation motor according to claim 8, characterized in that: There are two displacement sensors, which are distributed along the circumference of the stator assembly and in the same horizontal plane. The two displacement sensors are distributed at an angle of 90 degrees.

10. The magnetic levitation motor according to claim 9, characterized in that: The number of the displacement sensors is at least three, and the multiple displacement sensors are in the same horizontal plane and are evenly distributed at intervals along the circumference of the stator assembly.

Images