Magnetic levitation electric motor, submersible mixer, mixer and fan

Abstract

A magnetic levitation electric motor, a submersible mixer, a mixer and a fan. The magnetic levitation electric motor comprises: annular rotors (4) and a stator assembly, wherein the two annular rotors (4) are coaxial and are arranged in a vertical direction; the two annular rotors (4) have the same number of magnetic poles, and the arrangement directions of the magnetic poles of the two annular rotors (4) are the same or opposite; the two annular rotors (4) are fixed relative to each other, and the two annular rotors (4) are each sleeved on the outer side of the stator assembly; and the stator assembly drives the two annular rotors (4) to levitate and rotate by means of a magnetic force. An axial drive assembly can provide an additional axial force for a rotating cylinder (5), and can drive the rotating cylinder (5) to return to the normal position thereof after the rotating cylinder (5) shifts axially. A mounting cavity (81) isolates the stator assembly from the outside, and the rotating cylinder (5) isolates the annular rotors (4) from the outside, thereby preventing an external medium from being contaminated, and also preventing the external medium from corroding the stator assembly and the annular rotors (4).

Description

A magnetic levitation motor, a submersible mixer, a mixer and a fan Technical Field

[0001] This invention relates to the field of magnetic levitation device technology, and in particular to a magnetic levitation motor, a submersible stirrer, a stirrer and a fan. Background Technology

[0002] Due to usage requirements, the magnetic levitation device in existing mixers cannot occupy too much space, so a thin-plate magnetic levitation motor is usually used. However, existing thin-plate magnetic levitation motors, due to size limitations, have relatively low output power. Furthermore, their ability to control the axial movement of the rotating drum is poor, and the drum is prone to excessive deviation, affecting normal operation.

[0003] Existing submersible agitators are one-piece designs, meaning the position of the agitator blades cannot be changed, thus making them unsuitable for containers of varying depths. Some submersible agitators with multiple sets of agitator blades have fixed speed ratios between the different sets, preventing adjustments based on the fluid being agitated and hindering improvements in agitation efficiency.

[0004] The primary application of magnetic levitation fans is in the semiconductor industry. This is because they lack mechanical bearings, eliminating the generation of particulate impurities or other contaminants, thus preventing any impact on the cleanliness of the entire semiconductor cleanroom or equipment and contributing to improved wafer yield. Furthermore, the fan blades and rotor housing can be completely separated from the motor, allowing for better sealing of the rotor's permanent magnets due to the absence of dynamic seals—something mechanical bearing fans cannot achieve. This makes them better able to withstand the corrosive gases found in semiconductor environments. In addition, they offer long lifespan and low noise, making them ideal for applications where noise levels, lifespan, or long-term continuous operation are critical.

[0005] Existing agitators, due to the inconvenience of separating the rotating parts, often leave corners that are difficult to clean during cleaning, resulting in the stirred liquid being contaminated by residues from the previous agitation. Summary of the Invention

[0006] The present invention aims to solve the above-mentioned problems and provides a magnetic levitation motor, a submersible stirrer, a stirrer and a fan, thereby solving the above-mentioned technical problems.

[0007] A magnetic levitation motor includes: an annular rotor, a rotating cylinder, and a stator assembly. Two annular rotors are coaxial and arranged vertically. The two annular rotors have the same number of magnetic poles. The two annular rotors are fixedly connected to the rotating cylinder. The rotating cylinder and the two annular rotors are respectively fitted onto the outside of the stator assembly. The stator assembly drives the two annular rotors to rotate by magnetic force. The annular rotors are radially magnetized. The stator assembly drives the two annular rotors to levitate.

[0008] Furthermore, the stator assembly includes a first magnetic yoke and a coil group, the coil group being fitted and fixed to the outside of the first magnetic yoke, and the first magnetic yoke being evenly arranged in a circle.

[0009] Furthermore, the first magnetic yoke includes an axial arm and a radial arm. The upper and lower ends of the axial arm are fixedly connected to the radial arm, respectively. The radial arm protrudes outward and is located on the radial inner side of the annular rotor. The coil assembly is fitted on the outer side of the axial arm.

[0010] Furthermore, the coil assembly includes a levitation coil and a rotating coil, which are respectively mounted on the outside of the first magnetic yoke. The rotating coil is used to drive the annular rotor to rotate, and the levitation coil and the rotating coil together drive the annular rotor to levitate.

[0011] Furthermore, the magnetic poles of the two annular rotors are arranged in opposite directions.

[0012] Furthermore, it also includes a second magnetic yoke, the magnetic poles of the two annular rotors are arranged in the same direction, the first magnetic yoke passes through the second magnetic yoke and is fixed to the second magnetic yoke, the two coil groups corresponding to each first magnetic yoke are located on the upper and lower sides of the second magnetic yoke respectively, and the second magnetic yoke is annular;

[0013] It also includes a radial sensor and a controller, the radial sensor being used to detect the radial position of the rotating cylinder, and the controller being used to change the current in the coil assembly.

[0014] Furthermore, the rotating cylinder is made of a non-magnetic material, and the inner cavity of the rotating cylinder is open from top to bottom, with the annular rotor completely located inside the rotating cylinder.

[0015] Furthermore, it also includes an axial drive assembly, which includes a first axial magnetic unit and a second axial magnetic unit. The first axial magnetic unit is fixed in position relative to the stator assembly, and the second axial magnetic unit is fixed in position relative to the rotating cylinder. The first axial magnetic unit and the second axial magnetic unit are located on the same axis and are magnetically connected.

[0016] Furthermore, a mounting bracket is formed at the end of the rotating cylinder, and the second axial magnetic unit is fixedly connected to the mounting bracket;

[0017] The first axial magnetic unit includes a second axial iron core and a second axial coil. The second axial coil is fitted outside the second axial iron core. The second axial magnetic unit is a permanent magnet.

[0018] It also includes an axial sensor and a controller, wherein the axial sensor is used to detect the axial position of the rotating cylinder and the controller is used to change the direction of the current in the second axial coil.

[0019] A submersible stirrer using the aforementioned magnetic levitation motor further includes a motor housing made of a non-magnetic material, a stator assembly located inside the motor housing and fixedly connected to the motor housing, blades formed on the outer side of a rotating cylinder, the rotating cylinder being fitted onto the outer side of the motor housing, and multiple motor housings arranged in a straight line along the same axis, with fixed and detachable positions between the motor housings.

[0020] Furthermore, an annular boss is formed on the outer side of the motor housing, and the annular boss is located below the rotating cylinder. The annular boss is used to limit the axial displacement of the rotating cylinder.

[0021] It also includes a first magnetic component and a second magnetic component. The first magnetic component is fixedly connected to the annular boss, and the second magnetic component is fixedly connected to the rotating cylinder. The first magnetic component drives the second magnetic component to move axially through magnetic force.

[0022] Furthermore, the first magnetic component includes a soft magnet and an axial coil, the axial coil being wound around the outside of the soft magnet, and the second magnetic component is a magnet;

[0023] It also includes a sensor and a controller, the sensor being used to detect the axial position of the rotating cylinder, and the controller being used to change the direction of the current in the axial coil.

[0024] Furthermore, it also includes a connecting pipe, which is arranged in a straight line along the same axis as the motor housing, and two adjacent pipes are fixedly and detachably connected. The pipes include the motor housing and the connecting pipe.

[0025] It also includes an end cap, the connecting pipe and the motor housing are both vertically connected, and the end cap is detachably connected to the lower end of the lowest pipe fitting;

[0026] It also includes a top plate, the lower end of which is detachably connected to the upper end of the uppermost pipe fitting.

[0027] Furthermore, a second boss is formed at one end of the connecting pipe, and an internal thread is formed on the inner wall of the other end. An external thread is formed on the outer wall of the second boss. The internal thread and the external thread of the connecting pipe are respectively adapted to the external thread and the internal thread of the motor housing.

[0028] The end cap has an internal thread, which is adapted to the external threads of the connecting pipe and the motor housing.

[0029] A cylindrical body is formed in the middle of the top plate, and the cylindrical body has an external thread. The external thread of the cylindrical body is adapted to the internal thread of the connecting pipe and the motor housing.

[0030] A fan using the aforementioned magnetic levitation motor further includes blades, a mounting cavity, and a bracket. The bracket is fixedly connected to the mounting cavity, and the interior of the mounting cavity is not in communication with the outside. The stator assembly is located inside the mounting cavity and is fixedly connected to the mounting cavity. The rotating cylinder is fitted onto the outside of the mounting cavity, and the outside of the rotating cylinder is fixedly connected to the blades.

[0031] A stirrer using the aforementioned magnetic levitation motor further includes a housing and blades, the housing forming a mounting cavity, the stator assembly located within the mounting cavity and fixedly connected relative to the mounting cavity, the rotating cylinder being fitted onto the outside of the mounting cavity, the outside of the rotating cylinder being fixedly connected to the blades, and the rotating cylinder being located inside the housing.

[0032] Furthermore, it also includes an inner mounting cavity, the stator assembly is located inside the inner mounting cavity, the inner mounting cavity is inserted into the mounting cavity and fits against the mounting cavity, and the inner mounting cavity is fixed to and detachably connected to the mounting cavity.

[0033] The present invention has the following advantages:

[0034] 1. Each of the two radial arms corresponds to an annular rotor, which increases the total electromagnetic force on the annular rotor, thereby providing greater power to the main shaft with the same motor size, and thus increasing the blade speed;

[0035] 2. The two radial arms apply electromagnetic forces to the corresponding annular rotors, so that the rotating cylinder has two magnetic supports, resulting in smaller offset and more stable position of the rotating cylinder;

[0036] 3. By setting the second magnetic yoke, two independent magnetic circuits are formed. Different coil groups at the top and bottom can change the force on the two annular rotors by passing different currents through them. Thus, when the rotating cylinder deflects about the radial axis, two forces of different magnitudes are applied to the two ends of the rotating cylinder, causing the rotating cylinder to deflect in the opposite direction and recover, thereby improving the stability of the rotating cylinder during rotation.

[0037] 4. The axial drive assembly can provide additional axial force to the rotating cylinder, driving it to return to its normal position after axial displacement.

[0038] 5. By using different numbers of tubes, the number and axial position of the rotating cylinder can be changed, thereby adjusting according to the container conditions and improving the adaptability of the submersible mixer to different containers;

[0039] 6. Each rotating drum is driven by a stator assembly inside its corresponding motor housing. The rotation speed and direction of rotation of each rotating drum can be adjusted. The rotation speed, speed ratio and direction of rotation of each bladed rotating drum can be adjusted according to the fluid conditions, which improves the stirring effect on different fluids.

[0040] 7. Due to the use of a magnetic levitation structure, it improves cleanliness compared to agitators with bearings, and reduces cell damage when used as a biological agitator;

[0041] 8. At the same time, since there is no complicated connection structure between the rotating drum and the motor housing, the possibility of dirt and grime accumulating in the agitator is reduced, effectively reducing the difficulty of cleaning the inside of the agitator later.

[0042] 9. The size, shape, and number of blades of the rotating drum matched with multiple motor housings connected in series can be different to improve the stirring effect;

[0043] 10. The use of magnetic levitation and drive for the rotating cylinder eliminates contact between the rotating cylinder and the motor housing, and eliminates the need for dynamic seals, thus improving sealing performance, preventing fluid from entering the submersible agitator, reducing the possibility of dirt accumulation, and effectively reducing the difficulty of subsequent cleaning of the agitator's interior; the first and second magnetic components work together to provide additional axial force to the rotating cylinder, driving it to return to its normal position after axial displacement.

[0044] 11. The mounting cavity isolates the stator assembly from the outside world, and the rotating cylinder isolates the annular rotor from the outside world, thus avoiding contamination of the external medium and preventing the external medium from corroding the stator assembly and the annular rotor.

[0045] 12. The rotating cylinder can be axially detached from the outside of the mounting housing, thereby avoiding cleaning dead corners caused by mutual obstruction between the rotating cylinder and the mounting housing, and improving the cleanliness of the fan after cleaning;

[0046] 13. The rotating drum does not come into contact with the cylinder body and the mounting cavity when it rotates, so it will not generate tiny particles due to wear, thus avoiding contamination of the stirred liquid by tiny particles;

[0047] 14. The rotating cylinder and the mounting cavity have no mechanical connection structure. During cleaning, the rotating cylinder can be directly axially detached from the mounting cavity. After removing the rotating cylinder from the cylinder body, cleaning can be carried out without any dead corners. Therefore, the cleaning effect is better and avoids contamination of the later liquid caused by insufficient cleaning when agitating different liquids. After removing the rotating cylinder, since there is no obstruction from the rotating cylinder, there are no dead corners between the cylinder body and the mounting cavity, which improves the cleaning effect and reduces the residue of contaminants. Attached Figure Description

[0048] 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 one embodiment of the present invention. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0049] Figure 1: Schematic diagram of the three-dimensional structure of the magnetic levitation device (without the second magnetic yoke);

[0050] Figure 2: Schematic diagram of the magnetic pole changes of the rotating magnetic field in Figure 1;

[0051] Figure 3: Schematic diagram of the magnetic pole changes of the levitation magnetic field in Figure 1;

[0052] Figure 4: Schematic diagram of the three-dimensional structure of the magnetic levitation device (with a second magnetic yoke);

[0053] Figure 5: Schematic diagram of the magnetic pole changes of the rotating magnetic field in Figure 4;

[0054] Figure 6: Schematic diagram of the magnetic pole changes of the levitation magnetic field in Figure 4;

[0055] Figure 7: Cross-sectional view of a submersible stirrer (without a second magnetic yoke).

[0056] Figure 8: A magnified view of part A in Figure 7;

[0057] Figure 9: Schematic diagram of the three-dimensional structure of a submersible mixer;

[0058] Figure 10: Cross-sectional view of a submersible stirrer (with a second magnetic yoke).

[0059] Figure 11: A magnified view of section B in Figure 10;

[0060] Figure 12: Schematic diagram of the three-dimensional structure of the fan (part 1);

[0061] Figure 13: Second schematic diagram of the three-dimensional structure of the fan;

[0062] Figure 14: Schematic cross-sectional view of the fan in Figure 12 (without the second magnetic yoke);

[0063] Figure 15: Schematic cross-sectional view of the fan in Figure 12 (with a second magnetic yoke);

[0064] Figure 16: Schematic diagram of the three-dimensional structure of the stirrer (part 1);

[0065] Figure 17: Schematic cross-sectional view of the stirrer in Figure 16 (without the second magnetic yoke).

[0066] Figure 18: Schematic cross-sectional view of the stirrer in Figure 16 (with a second magnetic yoke);

[0067] Figure 19: Schematic diagram of the three-dimensional structure of the fan (part three);

[0068] Figure 20: Schematic cross-sectional view of the fan in Figure 19 (without the second magnetic yoke);

[0069] Figure 21: Schematic cross-sectional view of the fan in Figure 19 (with a second magnetic yoke);

[0070] Figure 22: Schematic diagram of the three-dimensional structure of the stirrer (part two);

[0071] Figure 23: A partial cross-sectional view of the stirrer in Figure 22 (without the second magnetic yoke);

[0072] Figure 24: A partial cross-sectional view of the stirrer in Figure 22 (with a second magnetic yoke). Embodiments of the present invention

[0073] The present invention will be further described below with reference to the accompanying drawings and examples:

[0074] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0075] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0076] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0077] Example 1:

[0078] As shown in Figures 4 to 6 and Figures 9 to 11, a magnetic levitation motor includes: an annular rotor 4, a rotating cylinder 5, and a stator assembly. Two annular rotors 4 are coaxial and arranged in a vertical direction. The two annular rotors 4 have the same number of magnetic poles. The two annular rotors 4 are fixedly connected to the rotating cylinder 5. The rotating cylinder 5 and the two annular rotors 4 are respectively fitted onto the outside of the stator assembly. The stator assembly drives the two annular rotors 4 to rotate by magnetic force. The magnetic poles of the two annular rotors 4 are arranged in the same direction.

[0079] Furthermore, the annular rotor 4 can be a single annular magnet or multiple magnets arranged in annular arrangement.

[0080] Furthermore, the stator assembly includes a first magnetic yoke 1 and a coil group, the coil group being fitted and fixed to the outside of the first magnetic yoke 1, and the first magnetic yoke 1 being evenly arranged in a circle.

[0081] Furthermore, the first magnetic yoke 1 includes an axial arm 11 and a radial arm 12. The upper and lower ends of the axial arm 11 are fixedly connected to the radial arm 12, respectively. The radial arm 12 protrudes outward and is located on the radial inner side of the annular rotor 4. The coil assembly is fitted on the outer side of the axial arm 11.

[0082] Each coil group may include one or more coils:

[0083] Alternatively, a coil group may consist of a single coil. In this case, a single coil provides both the rotating magnetic field and the levitation magnetic field to the annular rotor 4. The structure using only a single coil is simpler, but it places higher demands on the control system.

[0084] Optionally, the coil assembly includes a levitation coil 2 and a rotating coil 3, which are respectively mounted on the outside of the first magnetic yoke 1. The rotating coil 3 is used to drive the annular rotor 4 to rotate, and the levitation coil 2 and the rotating coil 3 together drive the annular rotor 4 to levitate. The structure using two coils is complex, but the requirements for the control system are lower.

[0085] Furthermore, it also includes a second magnetic yoke 9, through which the first magnetic yoke 1 passes and is fixed to the second magnetic yoke 9. The two coil groups corresponding to each first magnetic yoke 1 are located on the upper and lower sides of the second magnetic yoke 9, respectively. The second magnetic yoke 9 is annular. The second magnetic yoke 9 serves to conduct magnetism to the corresponding first magnetic yoke 1.

[0086] Furthermore, it also includes a radial sensor and a controller. The radial sensor is used to detect the radial positions of the upper and lower ends of the rotating cylinder 5, and the controller is used to change the current of the suspension coil 2 in the coil group. By applying different currents to the upper and lower suspension coils 2, different magnetic forces are applied to the two annular rotors 4, causing the rotating cylinder 5 to deflect.

[0087] Furthermore, the rotating cylinder 5 is made of a non-magnetic material, thereby avoiding the formation of an axial magnetic circuit between the two annular rotors 4 in the rotating cylinder 5.

[0088] Furthermore, the inner cavity of the rotating cylinder 5 is open from top to bottom, and the rotating cylinder 5 is a cylinder with openings at both ends, which makes it easy to fit the rotating cylinder 5 onto the outside of the motor housing 6.

[0089] Preferably, the annular rotor 4 is completely located inside the rotating cylinder 5, thereby preventing the annular rotor 4 from contacting the outside world and thus preventing the annular rotor 4 from contaminating the external medium. The rotating cylinder 5 can be made of a highly corrosion-resistant material such as plastic to prevent the external medium from corroding the annular rotor 4.

[0090] Taking a stator assembly comprising eight first magnetic yokes 1 and sixteen coil groups, with each first magnetic yoke 1 corresponding to two coil groups and each annular rotor 4 having two magnetic poles as an example, the levitation rotation principle of this embodiment is explained. It should be noted that this embodiment can employ various combinations of annular rotors 4 and first magnetic yokes 1 with different numbers of magnetic poles.

[0091] [Corrected according to Rule 91, 21.01.2026] As shown in Figure 4, N and S represent the two magnetic poles of the annular rotor 4. The rotating coil 3 of the upper coil group generates magnetomotive force, and the two rotating main magnetic circuits 13 of the upper layer pass through the two first magnetic yokes 1, the annular rotor 4, and the second magnetic yoke 9 of the upper layer to complete the closure. The rotating coil 3 of the lower coil group generates magnetomotive force at the same time, and the principle is the same as that of the upper layer. The rotating main magnetic circuit of the lower layer is not shown in the figure. In Figure 4, the two rotating main magnetic circuits 13 of the upper layer are represented by solid arrow dashed lines and hollow arrow dotted lines, respectively, and the direction of the arrow is the direction of the magnetic field.

[0092] It should be noted that the two independent magnetic circuits are the superposition of two components: the rotating main magnetic circuit 13 generated by the rotating coil 3 and the levitation magnetic circuit generated by the levitation coil 2. The rotating main magnetic circuit 13 with arrows in Figure 4 is the magnetic circuit used to rotate the annular rotor 4.

[0093] Now, let the rotating coils 3 of two adjacent first magnetic yokes 1 be filled with current in the same direction. At a certain moment, an N-pole magnetic field is generated. Then, the rotating coils 3 of the two radially symmetrical first magnetic yokes 1 should be filled with current in opposite directions, so that an S-pole magnetic field is generated at the same moment. At this time, a pair of magnetic fields required for rotation are formed. Through the phase change of the current, the pair of magnetic fields are rotated, thereby driving the ring rotor 4 to rotate. The position change of the rotating magnetic field and the ring rotor 4 is shown in Figure 5.

[0094] In Figure 5, both the upper and lower layers are viewed from above. The "upper layer" in Figure 5 refers to the magnetic field of the upper radial arm 12 and the upper annular rotor 4, the "lower layer" refers to the magnetic field of the lower radial arm 12 and the lower annular rotor 4, the angle below refers to the rotation angle of the annular rotor 4, the magnetic field inside the inner circle is the rotating magnetic field of the stator assembly, and the magnetic field between the circles is the magnetic field of the annular rotor 4.

[0095] Radial active levitation of the annular rotor 4 requires the generation of two pairs of magnetic poles by energizing the levitation coil 2 of the stator assembly, which is existing technology in the field of magnetic levitation motors. The number of levitation pole pairs is equal to the number of rotating pole pairs ± 1 pair. The offset correction of the annular rotor 4 is achieved by superimposing the levitation magnetic field onto the resultant magnetic field of the rotating magnetic field.

[0096] The positional changes of the levitation magnetic field and the annular rotor 4 are shown in Figure 6. In Figure 6, the upper and lower layers are both viewed from above. The "upper layer" in Figure 6 refers to the magnetic field of the upper radial arm 12 and the upper annular rotor 4, and the "lower layer" refers to the magnetic field of the lower radial arm 12 and the lower annular rotor 4. The angle below refers to the rotation angle of the annular rotor 4. The magnetic field inside the inner circle is the levitation magnetic field of the stator assembly, and the magnetic field between the two circles is the magnetic field of the corresponding annular rotor 4.

[0097] Of these, apart from the radial 2 degrees of freedom which are active suspension and axial rotation, the remaining degrees of freedom are all passive suspension.

[0098] It should be noted that since the magnetic poles of the two annular rotors 4 have the same polarity along their axial direction, the two radial arms 12 of the same first magnetic yoke 1 also have the same polarity.

[0099] In this embodiment, the two sets of coils can generate different magnetic forces on the two annular rotors 4 respectively. Since the two annular rotors 4 are placed coaxially at both ends of the rotating cylinder 5, compared with the existing magnetic levitation thin-film motor with only one permanent magnet rotor, this structure can better levitate and rotate a relatively long shaft, and has higher output power in the same volume.

[0100] In most motors, since the rotating cylinder 5 is connected to the load at only one end, the distances from the two annular rotors 4 to the point where the rotating cylinder 5 is subjected to force are different. When the radial external force on the rotating cylinder 5 is small, the magnetic resistance between the annular rotor 4 and the stator assembly can suppress the deflection of the rotating cylinder 5.

[0101] However, when the radial external force on the rotating cylinder 5 is too large, external forces need to be applied at both the upper and lower ends to suppress it. This requires applying different forces to the annular rotors 4 at both ends. The difference in the magnitude of the magnetic force on the upper and lower annular rotors 4 can be achieved by changing the current in the upper and lower layers of suspension coils 2.

[0102] Example 2:

[0103] As shown in Figures 1 to 3 and Figures 7 to 9, a magnetic levitation motor includes: an annular rotor 4, a rotating cylinder 5, and a stator assembly. Two annular rotors 4 are coaxial and arranged in a vertical direction. The two annular rotors 4 have the same number of magnetic poles. The two annular rotors 4 are fixedly connected to the rotating cylinder 5. The rotating cylinder 5 and the two annular rotors 4 are respectively fitted on the outside of the stator assembly. The stator assembly drives the two annular rotors 4 to rotate by magnetic force. The magnetic poles of the two annular rotors 4 are arranged in opposite directions.

[0104] Furthermore, the annular rotor 4 can be a single annular magnet or multiple magnets arranged in annular arrangement.

[0105] Furthermore, the stator assembly includes a first magnetic yoke 1 and a coil group, the coil group being fitted and fixed to the outside of the first magnetic yoke 1, the first magnetic yoke 1 being evenly arranged in a circle.

[0106] Furthermore, the first magnetic yoke 1 includes an axial arm 11 and a radial arm 12. The upper and lower ends of the axial arm 11 are fixedly connected to the radial arm 12, respectively. The radial arm 12 protrudes outward and is located on the radial inner side of the annular rotor 4. The coil assembly is fitted on the outer side of the axial arm 11.

[0107] Each coil group may include one or more coils:

[0108] Alternatively, a coil group may consist of a single coil. In this case, a single coil provides both the rotating magnetic field and the levitation magnetic field to the annular rotor 4. The structure using only a single coil is simpler, but it places higher demands on the control system.

[0109] Optionally, the coil assembly includes a levitation coil 2 and a rotating coil 3, which are respectively mounted on the outside of the first magnetic yoke 1. The rotating coil 3 is used to drive the annular rotor 4 to rotate, and the levitation coil 2 and the rotating coil 3 together drive the annular rotor 4 to levitate. The structure using two coils is complex, but the requirements for the control system are lower.

[0110] Furthermore, adjacent first magnetic yokes 1 are not connected by a magnetically conductive material; adjacent first magnetic yokes 1 refer to two circumferentially adjacent first magnetic yokes 1. This is because if two circumferentially adjacent first magnetic yokes 1 were connected by a magnetically conductive material, the magnetic circuit would be altered.

[0111] Furthermore, the rotating cylinder 5 is made of a non-magnetic material, thereby avoiding the formation of an axial magnetic circuit between the two annular rotors 4 in the rotating cylinder 5.

[0112] Furthermore, the inner cavity of the rotating cylinder 5 is open from top to bottom, and the rotating cylinder 5 is a cylinder with openings at both ends, which makes it easy to fit the rotating cylinder 5 onto the outside of the motor housing 6.

[0113] Preferably, the annular rotor 4 is completely located inside the rotating cylinder 5, thereby preventing the annular rotor 4 from contacting the outside world and thus preventing the annular rotor 4 from contaminating the external medium. The rotating cylinder 5 can be made of a highly corrosion-resistant material such as plastic to prevent the external medium from corroding the annular rotor 4.

[0114] As shown in Figures 1 to 3, taking an example where the stator assembly includes eight first magnetic yokes 1 and eight coil groups, and each annular rotor 4 has two magnetic poles, the levitation rotation principle of this embodiment is illustrated. It should be noted that this embodiment can employ various combinations of annular rotors 4 and first magnetic yokes 1 with different numbers of magnetic poles.

[0115] For rotation, similar to permanent magnet synchronous motors, the stator typically needs to generate a rotating magnetic field with the same number of poles as the annular rotor 4. Since this embodiment consists of two annular rotors 4 arranged in a straight line along the axis, and the coaxial annular rotors 4 are not connected by a magnetic material, and the first magnetic yoke 1 is C-shaped and adjacent first magnetic yokes 1 are not connected by a magnetic material, in order to realize the rotating magnetic field, the magnetic pole positions of the double-layer annular rotor 4 need to be misaligned. That is, when the annular rotor 4 has 1 pole pair, the same magnetic poles of the double-layer annular rotor 4 are offset by 180°.

[0116] It should be noted that when the annular rotor 4 has M pole pairs, the same poles of the annular rotor 4 are offset by 180° / M.

[0117] Now, let the rotating coils 3 of two adjacent first magnetic yokes 1 be filled with current in the same direction. At a certain moment, an N-pole magnetic field is generated. Then, the rotating coils 3 of the two radially symmetrical first magnetic yokes 1 should be filled with current in opposite directions, so that an S-pole magnetic field is generated at the same moment. At this time, a pair of magnetic fields required for rotation are formed. Through the phase change of the current, the pair of magnetic fields are rotated, thereby driving the ring rotor 4 to rotate. The position change of the rotating magnetic field and the ring rotor 4 is shown in Figure 2.

[0118] In Figure 2, both the upper and lower layers are viewed from above. The "upper layer" in Figure 2 refers to the magnetic field of the upper radial arm 12 and the upper annular rotor 4, the "lower layer" refers to the magnetic field of the upper radial arm 12 and the upper annular rotor 4, the angle below refers to the rotation angle of the annular rotor 4, the magnetic field inside the circle is the rotating magnetic field of the stator assembly, and the magnetic field between the circles is the magnetic field of the corresponding annular rotor 4.

[0119] [Corrected according to Rule 91, 21.01.2026] As shown in Figure 1, N and S represent the two magnetic poles of the annular rotor 4. The rotating coil 3 generates magnetomotive force, and the rotating main magnetic circuit 13 passes through the two first magnetic yokes 1 and the two annular rotors 4 to complete the closure. In Figure 1, the two rotating main magnetic circuits 13 are represented by solid arrow dashed lines and hollow arrow dotted lines, respectively, and the direction of the arrow is the direction of the magnetic field.

[0120] It should be noted that an independent magnetic circuit consists of the superposition of two components: the rotating main magnetic circuit 13 generated by the rotating coil 3 and the levitation magnetic circuit generated by the levitation coil 2. The rotating main magnetic circuit 13 with arrows in Figure 1 is the magnetic circuit used to rotate the annular rotor 4.

[0121] Radial active levitation of the annular rotor 4 requires the generation of two pairs of magnetic poles by energizing the levitation coil 2 of the stator, which is existing technology in the field of magnetic levitation motors. The number of levitation magnetic pole pairs is equal to the number of rotating magnetic pole pairs ± 1 pair. The offset correction of the annular rotor 4 is achieved by superimposing the levitation magnetic field onto the resultant magnetic field of the rotating magnetic field.

[0122] The change of the levitation magnetic field of the double-layer annular rotor 4 can be understood through Figure 3. Except for the radial 2 degrees of freedom which are active levitation and axial rotation, the other degrees of freedom are passive levitation. Since the double-layer annular rotor 4 needs to participate simultaneously to form the rotating main magnetic circuit 13 when a certain stator needs to work, the magnitude of the corrective force on the two annular rotors 4 will be the same regardless of whether they are actively or passively levitation.

[0123] In Figure 3, both the upper and lower layers are viewed from above. The "upper layer" in Figure 3 refers to the magnetic field of the upper radial arm 12 and the upper annular rotor 4, the "lower layer" refers to the magnetic field of the upper radial arm 12 and the upper annular rotor 4, the angle below refers to the rotation angle of the annular rotor 4, the magnetic field inside the circle is the levitation magnetic field of the stator assembly, and the magnetic field between the circles is the magnetic field of the corresponding annular rotor 4.

[0124] Since the two-layer annular rotor 4 is placed coaxially at both ends of the rotating cylinder 5, compared with the existing magnetic levitation thin-plate motor with only one annular rotor 4, this structure can better levitate and rotate a relatively long shaft and output greater power.

[0125] Example 3:

[0126] Example 3 is a further improvement of Example 1 or 2, as shown in Figures 12 to 18, and further includes an axial drive assembly. The axial drive assembly includes a first axial magnetic unit 66 and a second axial magnetic unit 77. The first axial magnetic unit 66 is fixed in position relative to the stator assembly, and the second axial magnetic unit 77 is fixed in position relative to the rotating cylinder 5. The first axial magnetic unit 66 and the second axial magnetic unit 77 are located on the same axis and are magnetically connected.

[0127] Optionally, the first axial magnetic unit 66 includes a second axial core 661 and a second axial coil 662, with the second axial coil 662 fitted outside the second axial core 661. The second axial magnetic unit 77 is made of a soft magnetic material. The second axial magnetic unit 77 can only be attracted by the force generated by the first axial magnetic unit 661. Because the second axial core 661 is excited to produce an N pole or a S pole by the second axial coil 662, the second axial magnetic unit 77 can only generate the opposite polarity through eddy currents, thus producing an attractive force. This structural arrangement is suitable when the blade 52 is mainly subjected to an upward axial force. When the upward axial force is too large, it can be suppressed by the attractive force generated by this structure.

[0128] Optionally, the first axial magnetic unit 66 includes a second axial iron core 661 and a second axial coil 662, with the second axial coil 662 fitted outside the second axial iron core 661. The second axial magnetic unit 77 is a permanent magnet. By controlling the direction of the current in the second axial coil 662, magnetic poles with the same or opposite polarity as the second axial magnetic unit 77 can be generated, thereby producing attractive or repulsive forces to handle more complex situations. Preferably, the magnitude of the current in the second axial coil 662 can be changed to control the magnitude of the attractive or repulsive force.

[0129] Furthermore, a mounting bracket 51 is formed at the end of the rotating cylinder 5, and the second axial magnetic unit 7 is fixedly connected to the mounting bracket 51.

[0130] Preferably, the second axial magnetic unit 77 is completely embedded inside the mounting bracket 51, thereby preventing the second axial magnetic unit 77 from contacting the outside world and thus preventing the second axial magnetic unit 77 from contaminating the external medium. The mounting bracket 51 can be made of a material with strong corrosion resistance, such as plastic, to prevent the external medium from corroding the second axial magnetic unit 77.

[0131] Furthermore, the second axial magnetic unit 77 is a cylinder or a ring.

[0132] Furthermore, the first axial magnetic unit 66 may be one or more.

[0133] Furthermore, it also includes an axial sensor and a controller. The axial sensor is used to detect the axial position of the rotating cylinder 5, and the controller is used to change the direction of the current in the second axial coil 662. The position is detected by the axial sensor, and the detected position information is transmitted to the controller, which determines whether the second axial coil 662 needs to be energized and the direction of energization.

[0134] Example 4:

[0135] As shown in Figures 1 to 11, a submersible stirrer using the magnetic levitation motor described in Embodiment 1 or 2 further includes a motor housing 6, which is made of a non-magnetic material. The stator assembly is located inside the motor housing 6 and is fixedly connected to the motor housing 6. Blades 52 are formed on the outer side of the rotating cylinder 5, which is fitted onto the outer side of the motor housing 6. Multiple motor housings 6 are arranged in a straight line along the same axis. The positions of the motor housings 6 are fixed and detachable. The motor housings 6 can be directly connected or indirectly connected through other connecting parts.

[0136] Furthermore, an annular boss 62 is formed on the outer side of the motor housing 6. The annular boss 62 is located below the rotating cylinder 5 and is used to limit the axial displacement of the rotating cylinder 5. In order to prevent the rotating cylinder 5 from falling away from the outer side of the motor housing 6 due to gravity, the annular boss 62 is used to stop the rotating cylinder 5 and prevent the rotating cylinder 5 from continuing to fall after contact.

[0137] Furthermore, it also includes a first magnetic component 10 and a second magnetic component 103. The first magnetic component 10 is fixedly connected to the annular boss 62, and the second magnetic component 103 is fixedly connected to the rotating cylinder 5. The first magnetic component 10 drives the second magnetic component 103 to move axially through magnetic force.

[0138] Optionally, the first magnetic component 10 is a magnet, and the second magnetic component 103 is a magnet. In this case, the first magnetic component 10 and the second magnetic component 103 generate a repulsive force, thereby using magnetic force to overcome the gravity of the rotating cylinder 5 and suspend it.

[0139] Optionally, the first magnetic component 10 includes a soft magnet 101 and an axial coil 102, with the axial coil 102 wound around the outside of the soft magnet 101. The second magnetic component 103 is a magnet. By changing the direction of the current in the axial coil 102, the direction of the magnetic force on the second magnetic component 103 can be changed, thereby driving the rotating cylinder 5 to move axially upward or downward according to its position. By changing the magnitude of the current in the axial coil 102, the magnitude of the magnetic force can be changed, thereby precisely controlling the axial position of the rotating cylinder 5.

[0140] More preferably, it also includes an axial sensor and a controller. The axial sensor is used to detect the axial position of the rotating cylinder 5, and the controller is used to change the direction of the current in the axial coil 102. The axial position of the rotating cylinder 5 is detected by the axial sensor, and the detected position information is transmitted to the controller, which determines whether the axial coil 102 needs to be energized and the direction of energization.

[0141] Furthermore, it also includes a connecting pipe 7, which is arranged in a straight line along the same axis as the motor housing 6. Two adjacent pipes are fixed and detachably connected. The pipes include the motor housing 6 and the connecting pipe 7.

[0142] Several connecting pipes 7 can be located between two motor housings 6, and the axial distance between the two motor housings 6 and the rotating cylinder 5 outside them can be changed by the number of connecting pipes 7.

[0143] Alternatively, the depth of the rotating cylinder 5 can be changed by using a motor housing 6 without an outer rotating cylinder 5. For example, two motor housings 6 can be directly fixed together, with the upper motor housing 6 having no rotating cylinder 5 on its outer side and the lower motor housing 6 having a rotating cylinder 5 on its outer side, thus reducing the height of the rotating cylinder 5. In this case, the upper motor housing 6 acts as a connecting pipe 7 and can be de-energized. This method eliminates the need for the connecting pipe 7, reducing the number of required parts.

[0144] Furthermore, it also includes an end cap 63, through which both the connecting pipe 7 and the motor housing 6 pass vertically, facilitating the upward passage of electrical wires. The end cap 63 is detachably connected to the lower end of the lowest fitting. The end cap 63 is used to seal the inner cavity of the motor housing 6 or the connecting pipe 7, providing a sealing effect and preventing external fluids from entering the inner cavity of the motor housing 6 or the connecting pipe 7.

[0145] Furthermore, it also includes a top plate 72, the lower end of which is detachably connected to the upper end of the uppermost pipe fitting; it also includes a barrel body 8, which is fixed to and detachably connected to the top plate 72. The top plate 72 serves as a connector, used to connect the pipe fitting and the barrel body 8, thus fixing their positions.

[0146] Furthermore, one end of the motor housing 6 has a first boss 61, and the inner wall of the other end has an internal thread, while the outer wall of the first boss 61 has an external thread; one end of the connecting pipe 7 has a second boss 71, and the inner wall of the other end has an internal thread, while the outer wall of the second boss 71 has an external thread; the end cap 63 has an internal thread; and the top plate 72 has an external thread; the external and internal threads are compatible. The threads of the motor housing 6, the connecting pipe 7, and the end cap 63 are compatible, thereby allowing the motor housing 6, the connecting pipe 7, and the end cap 63 to be threadedly connected to each other.

[0147] Furthermore, blades 52 are formed on the outer side of the rotating cylinder 5, and the blades 52 are used to stir the fluid.

[0148] Furthermore, the annular rotor 4 is completely located within the rotating cylinder 5, that is, the rotating cylinder 5 encloses the annular rotor 4, preventing the annular rotor 4 from contacting the external fluid, preventing the annular rotor 4 from contaminating the fluid, and preventing the fluid from corroding the annular rotor 4.

[0149] Furthermore, the rotating cylinder 5 and the motor housing 6 are made of non-magnetic materials. The rotating cylinder 5, the motor housing 6, the end cap 63, and the connecting pipe 7 can be made of corrosion-resistant plastic.

[0150] Furthermore, the stator assembly includes a first magnetic yoke 1 and a coil, the magnetic yoke 1 being evenly arranged in a circle, and the coil being fitted onto the outside of the first magnetic yoke 1.

[0151] It should be noted that the submersible agitator may or may not include the tank 8. When the tank 8 is not included, the submersible agitator is inserted into the container containing fluid and fixed to the container. When the tank 8 is included, the fluid is added directly into the tank 8.

[0152] During installation, the number of motor housings 6 and rotating cylinders 5 is changed according to the requirements of the stirring fluid and the container. The distance between the two rotating cylinders 5 is changed by altering the number of connecting pipes 7 between the two motor housings 6 or by changing the number of motor housings 6 without rotating cylinders 5. The depth of the rotating cylinder 5 within the container is changed by altering the number of motor housings 6 and the top plate 72.

[0153] During operation, the stator assembly drives the annular rotor 4 to rotate, which in turn drives the blades 52 to rotate, thus stirring the fluid. The rotating cylinder 5 is suspended and does not contact the motor housing 6. The levitation force of the annular rotor 4 can be provided by the stator assembly and / or the first magnetic assembly 10.

[0154] Since each rotating drum 5 is driven by a stator assembly within its corresponding motor housing 6, the rotational speed of each rotating drum 5 can be adjusted to generate the required differential speed, thereby improving the stirring effect on a specific fluid.

[0155] Example 5:

[0156] As shown in Figures 12 to 15 and Figures 19 to 21, a fan using the magnetic levitation motor described in any one of Embodiments 1 to 3 further includes blades 52, a mounting cavity 81, and a bracket 82. The bracket 82 is fixedly connected to the mounting cavity 81. The interior of the mounting cavity 81 is not in communication with the outside. The stator assembly is located inside the mounting cavity 81 and is fixedly connected to the mounting cavity 81. The rotating cylinder 5 is fitted onto the outside of the mounting cavity 81, and the outside of the rotating cylinder 5 is fixedly connected to the blades 52. The stator assembly is located inside the mounting cavity 81, avoiding contact with the external medium and preventing the external medium from affecting the stator assembly, while also preventing the stator assembly from contaminating the external medium.

[0157] Since the two-layer annular rotor 4 is placed coaxially at both ends of the rotating cylinder 5, compared with the existing magnetic levitation thin-plate motor with only one annular rotor 4, this structure can better levitate and rotate a relatively long shaft and output greater power.

[0158] Optionally, the mounting cavity 81 can be located directly in the ventilation duct or other channel, and the bracket 82 is fixed to the ventilation duct or other channel.

[0159] Optionally, the system also includes a housing 8, with the mounting cavity 81 located inside the housing 8, and the bracket 82 fixedly connected to the housing 8. The housing 8 accommodates the blade 52 and radially shields the blade 52 to prevent injury from the rotating blade 52.

[0160] Furthermore, it also includes a mounting bracket 663, which is located inside the mounting cavity 81 and fixed in position to the mounting cavity 81, and the second axial iron core 661 is fixedly connected to the mounting bracket 663.

[0161] During operation, the stator assembly drives the two annular rotors 4 to rotate and levitate simultaneously through magnetic force, so that the rotating cylinder 5 does not come into contact with components such as the mounting housing 81 when rotating, reducing the friction of the rotating cylinder 5 when the fan is working; at the same time, it reduces the small particles generated by the contact wear between the rotating cylinder 5 and the mounting housing 81, ensuring the cleanliness of the environment, and is suitable for environments with high air cleanliness requirements such as semiconductor processing workshops.

[0162] The stator assembly drives two annular rotors 4 simultaneously through magnetic force, so that the rotating cylinder 5 can output greater power under the premise of a fixed volume of stator assembly, thereby improving the exhaust efficiency of the fan.

[0163] During cleaning, the rotating cylinder 5 can be axially detached from the outside of the mounting housing 81, thereby avoiding cleaning dead corners caused by mutual obstruction between the rotating cylinder 5 and the mounting housing 81, and improving the cleanliness of the fan after cleaning.

[0164] As shown in Figures 19 to 21, the fan is based on the axial drive assembly of Embodiment 1 or 2, excluding Embodiment 3, and the rotating cylinder 5, which is axially offset, is reset by the magnetic reluctance of the annular rotor 4 and the stator assembly.

[0165] When the fan uses the magnetic levitation motor in Embodiment 1: the two sets of coils can generate different magnetic forces on the two annular rotors 4 respectively. Since the two annular rotors 4 are placed coaxially at both ends of the rotating cylinder 5, compared with the existing magnetic levitation thin-film motor with only one permanent magnet rotor, this structure can better levitate and rotate a relatively long shaft, and has higher output power in the same volume.

[0166] In most motors, since the rotating cylinder 5 is connected to the load at only one end, the distances from the two annular rotors 4 to the point where the rotating cylinder 5 is subjected to force are different. When the radial external force on the rotating cylinder 5 is small, the magnetic resistance between the annular rotor 4 and the stator assembly can suppress the deflection of the rotating cylinder 5.

[0167] However, when the radial external force on the rotating cylinder 5 is too large, external forces need to be applied at both the upper and lower ends to suppress it. This requires applying different forces to the annular rotors 4 at both ends. The difference in the magnitude of the magnetic force on the upper and lower annular rotors 4 can be achieved by changing the current in the upper and lower layers of suspension coils 2.

[0168] Furthermore, it also includes a radial sensor and a controller. The radial sensor is used to detect the radial positions of the upper and lower ends of the rotating cylinder 5, and the controller is used to change the current of the suspension coil 2 in the coil group. By applying different currents to the upper and lower suspension coils 2, different magnetic forces are applied to the two annular rotors 4, causing the rotating cylinder 5 to deflect.

[0169] As shown in Figures 12 to 15, the fan includes the axial drive assembly of Embodiment 3. Based on magnetic resistance, the axial drive assembly actively drives the rotating cylinder 5 to move axially relative to the mounting cavity 81 through magnetic force, thereby correcting the axial offset of the rotating cylinder 5.

[0170] Example 6:

[0171] As shown in Figures 16 to 19 and Figures 22 to 24, a stirrer using the magnetic levitation motor described in any one of Embodiments 1 to 3 further includes a housing 8 and blades 52. The housing 8 forms an installation cavity 81. The stator assembly is located inside the installation cavity 81 and is fixedly connected to the housing 8. The rotating cylinder 5 is fitted onto the outside of the installation cavity 81. The outside of the rotating cylinder 5 is fixedly connected to the blades 52. The rotating cylinder 5 is located inside the housing 8.

[0172] Furthermore, it also includes an inner mounting cavity 83, in which the stator assembly is located. The inner mounting cavity 83 is inserted into and fits against the mounting cavity 81. The inner mounting cavity 83 is fixed to and detachably connected to the mounting cavity 81. The inner mounting cavity 83 facilitates the replacement and maintenance of the stator assembly. When the stator assembly malfunctions, the faulty mounting cavity 83 can be removed, and a new mounting cavity 83 can be directly inserted, shortening the downtime of the agitator.

[0173] Furthermore, the annular rotor 4 is entirely located within the side wall of the rotating cylinder 5, and the interior of the mounting cavity 81 is not connected to the interior of the cylinder 8. Neither the annular rotor 4 nor the stator assembly will come into contact with the liquid inside the cylinder 8, thus avoiding contamination of the liquid inside the cylinder 8 and preventing damage to the annular rotor 4 and the stator assembly caused by the liquid.

[0174] Furthermore, the rotating cylinder 5 is fixedly connected to multiple blades 52, and all the blades 52 are arranged evenly around the circumference.

[0175] During operation, the cylinder 8 is filled with liquid, and the stator assembly drives two annular rotors 4, which in turn causes the rotating cylinder 5 to suspend and rotate. At this time, the rotating cylinder 5 does not contact the cylinder 8 and the mounting cavity 81, and there is no frictional resistance between the rotating cylinder 5 and the cylinder 8 and the mounting cavity 81; at the same time, the rotating cylinder 5 will not wear against the cylinder 8 and the mounting cavity 81 to generate tiny particles, thus avoiding contamination of the liquid by tiny particles.

[0176] Since there is no mechanical connection between the rotating cylinder 5 and the mounting cavity 81, the rotating cylinder 5 can be directly axially detached from the mounting cavity 81 during cleaning. After removing the rotating cylinder 5 from the cylinder 8, cleaning can proceed without any blind spots, resulting in better cleaning and preventing contamination of the subsequent liquid due to insufficient cleaning during the mixing of different liquids. Furthermore, without the rotating cylinder 5 obstructing the flow, there are no blind spots between the cylinder 8 and the mounting cavity 81, further improving cleaning effectiveness and reducing contaminant residue.

[0177] As shown in Figures 22 to 24, the stirrer is based on the axial drive assembly of Embodiment 1 or 2, excluding Embodiment 3, and the axially offset rotating cylinder 5 is reset by the magnetic reluctance of the annular rotor 4 and the stator assembly.

[0178] As shown in Figures 16 to 19, the stirrer includes the axial drive assembly of Embodiment 3. Based on magnetic resistance, the axial drive assembly actively drives the rotating cylinder 5 to move axially relative to the mounting cavity 81 through magnetic force, thereby correcting the axial offset of the rotating cylinder 5.

[0179] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A magnetic levitation motor, characterized in that, include: The annular rotor (4), rotating cylinder (5) and stator assembly are provided. The two annular rotors (4) are coaxial and arranged in the vertical direction. The two annular rotors (4) have the same number of magnetic poles. The two annular rotors (4) are fixedly connected to the rotating cylinder (5). The rotating cylinder (5) and the two annular rotors (4) are respectively fitted on the outside of the stator assembly. The stator assembly drives the two annular rotors (4) to rotate by magnetic force. The annular rotors (4) are radially magnetized. The stator assembly drives the two annular rotors (4) to levitate.

2. A magnetic levitation motor according to claim 1, characterized in that: The stator assembly includes a first magnetic yoke (1) and a coil group. The coil group is fitted and fixed on the outside of the first magnetic yoke (1). The first magnetic yoke (1) is arranged evenly around the circumference.

3. A magnetic levitation motor according to claim 2, characterized in that: The first magnetic yoke (1) includes an axial arm (11) and a radial arm (12). The upper and lower ends of the axial arm (11) are fixedly connected to the radial arm (12) respectively. The radial arm (12) protrudes outward and is located on the radial inner side of the annular rotor (4). The coil assembly is fitted on the outside of the axial arm (11).

4. A magnetic levitation motor according to claim 2, characterized in that: The coil group includes a levitation coil (2) and a rotating coil (3). The levitation coil (2) and the rotating coil (3) are respectively mounted on the outside of the first magnetic yoke (1). The rotating coil (3) is used to drive the annular rotor (4) to rotate. The levitation coil (2) and the rotating coil (3) together drive the annular rotor (4) to levitate.

5. A magnetic levitation motor according to claim 2, characterized in that: The magnetic poles of the two annular rotors (4) are arranged in opposite directions.

6. A magnetic levitation motor according to claim 2, characterized in that: It also includes a second magnetic yoke (9), the magnetic poles of the two annular rotors (4) are arranged in the same direction, the first magnetic yoke (1) passes through the second magnetic yoke (9) and is fixed to the second magnetic yoke (9), the two coil groups corresponding to each first magnetic yoke (1) are located on the upper and lower sides of the second magnetic yoke (9) respectively, and the second magnetic yoke (9) is annular; It also includes a radial sensor and a controller, the radial sensor being used to detect the radial position of the rotating cylinder (5), and the controller being used to change the current in the coil assembly.

7. A magnetic levitation motor according to claim 1, characterized in that: The rotating cylinder (5) is made of non-magnetic material, and the inner cavity of the rotating cylinder (5) is open from top to bottom. The annular rotor (4) is completely located in the rotating cylinder (5).

8. A magnetic levitation motor according to claim 1, characterized in that: It also includes an axial drive assembly, which includes a first axial magnetic unit (66) and a second axial magnetic unit (77). The first axial magnetic unit (66) is fixed in position relative to the stator assembly, and the second axial magnetic unit (77) is fixed in position relative to the rotating cylinder (5). The first axial magnetic unit (66) and the second axial magnetic unit (77) are located on the same axis and are magnetically connected.

9. A magnetic levitation motor according to claim 8, characterized in that: The rotating cylinder (5) has a mounting bracket (51) formed at its end, and the second axial magnetic unit (77) is fixedly connected to the mounting bracket (51); The first axial magnetic unit (66) includes a second axial iron core (661) and a second axial coil (662). The second axial coil (662) is fitted outside the second axial iron core (661). The second axial magnetic unit (77) is a permanent magnet. It also includes an axial sensor and a controller, the axial sensor being used to detect the axial position of the rotating cylinder (5), and the controller being used to change the direction of the current in the second axial coil (662).

10. A submersible stirrer using a magnetic levitation motor as described in any one of claims 1 to 7, characterized in that: It also includes a motor housing (6), which is made of non-magnetic material. The stator assembly is located inside the motor housing (6) and is fixedly connected to the motor housing (6). The rotating cylinder (5) has blades (52) formed on its outer side. The rotating cylinder (5) is fitted on the outer side of the motor housing (6). Multiple motor housings (6) are arranged in a straight line along the same axis. The positions of the motor housings (6) are fixed and detachable.

11. A submersible mixer according to claim 10, characterized in that: An annular boss (62) is formed on the outer side of the motor housing (6). The annular boss (62) is located below the rotating cylinder (5). The annular boss (62) is used to limit the axial displacement of the rotating cylinder (5). It also includes a first magnetic component (10) and a second magnetic component (103). The first magnetic component (10) is fixedly connected to the annular boss (62), and the second magnetic component (103) is fixedly connected to the rotating cylinder (5). The first magnetic component (10) drives the second magnetic component (103) to move axially through magnetic force.

12. A submersible mixer according to claim 11, characterized in that: The first magnetic component (10) includes a soft magnet (101) and an axial coil (102), the axial coil (102) being wound around the outside of the soft magnet (101), and the second magnetic component (103) is a magnet; It also includes a sensor and a controller, the sensor being used to detect the axial position of the rotating cylinder (5) and the controller being used to change the direction of the current in the axial coil (102).

13. A submersible mixer according to claim 10, characterized in that: It also includes a connecting pipe (7), which is arranged in a straight line along the same axis as the motor housing (6). Two adjacent pipes are fixed and detachably connected. The pipes include the motor housing (6) and the connecting pipe (7). It also includes an end cap (63), the connecting pipe (7) and the motor housing (6) are both vertically connected, and the end cap (63) is detachably connected to the lower end of the lowest pipe fitting; It also includes a top plate (72), the lower end of which is detachably connected to the upper end of the uppermost pipe fitting.

14. A submersible mixer according to claim 13, characterized in that: The connecting pipe (7) has a second boss (71) at one end and an internal thread at the other end. The second boss (71) has an external thread on its outer wall. The internal thread and external thread of the connecting pipe (7) are respectively adapted to the external thread and internal thread of the motor housing (6). The end cap (63) has an internal thread, which is adapted to the external threads of the connecting pipe (7) and the motor housing (6); The top plate (72) has a cylindrical body that runs vertically through the middle. The cylindrical body has an external thread, which is compatible with the internal threads of the connecting pipe (7) and the motor housing (6).

15. A fan using a magnetic levitation motor as described in any one of claims 1 to 9, characterized in that: It also includes blades (52), mounting cavity (81) and bracket (82), the bracket (82) is fixedly connected to the mounting cavity (81), the interior of the mounting cavity (81) is not connected to the outside, the stator assembly is located inside the mounting cavity (81) and is fixedly connected to the mounting cavity (81), the rotating cylinder (5) is fitted on the outside of the mounting cavity (81), and the outside of the rotating cylinder (5) is fixedly connected to the blade (52).

16. A stirrer using a magnetic levitation motor as described in any one of claims 1 to 9, characterized in that: It also includes a housing (8) and blades (52), the housing (8) forming a mounting cavity (81), the stator assembly being located inside the mounting cavity (81) and fixedly connected to the mounting cavity (81), the rotating cylinder (5) being fitted on the outside of the mounting cavity (81), the outside of the rotating cylinder (5) being fixedly connected to the blades (52), and the rotating cylinder (5) being located inside the housing (8).

17. A stirrer according to claim 16, characterized in that: It also includes an inner mounting cavity (83), the stator assembly is located inside the inner mounting cavity (83), the inner mounting cavity (83) is inserted into the mounting cavity (81) and fits against the mounting cavity (81), the inner mounting cavity (83) and the mounting cavity (81) are fixed and detachably connected.

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