Magnetic levitation fan and control method

Abstract

The application provides a magnetic suspension fan and a control method, and the magnetic suspension fan comprises: a volute, which is internally provided with centrifugal fan blades and has open ends to form return air inlets; a motor assembly, whose rotor is arranged at the two ends of the centrifugal fan blades, and whose stator is arranged outside the open ends of the volute to cooperate with the rotor; a plurality of permanent magnets, which are arranged around the outer surface of the centrifugal fan blades; and a plurality of electromagnets, which are arranged on the inner wall of the fan blade cavity of the volute and correspond to the permanent magnets, and which can make the centrifugal fan blades and the rotor suspended by the magnetic force of the permanent magnets when electrified. The application adopts an integrated structure, the electromagnets and the permanent magnets are arranged corresponding to the suspension structure between the inner wall of the volute and the outer surface of the centrifugal fan blades, the centrifugal fan blades and the rotor can be suspended without contact during operation, and the friction, wear and noise caused by bearings or impeller supports in the traditional mechanical transmission structure are avoided. Meanwhile, the centrifugal fan blades are supported by the magnetic force, higher rotating speed and efficiency can be realized, and the centrifugal fan blades can keep a low noise and low vibration state during long-term operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnetic suspension fan, in particular to a magnetic suspension fan and a control method. BACKGROUND

[0002] In recent years, DC brushless motors have been widely used in industrial and civilian fields due to their high operating efficiency, strong reliability, and low maintenance requirements. In the drive system of fan-coil units, traditional DC brushless motors have replaced AC motors with higher noise to some extent due to their lower noise performance, especially in commercial and residential air conditioning systems. However, for some places with higher noise requirements, such as high-end residences, hospitals, and libraries, fan-coil units driven by traditional DC brushless motors still cannot fully meet the requirements, and their operating noise may still exceed the comfortable range.

[0003] To further reduce noise and improve performance, magnetic suspension motor technology has been gradually introduced into fan-coil unit systems. Magnetic suspension motors rely on magnetic force to support rotating parts, avoiding friction caused by mechanical contact during operation, thereby significantly reducing noise and vibration. At the same time, due to the elimination of mechanical friction, the service life is greatly extended, and the maintenance cost is also reduced accordingly. The application of magnetic suspension motors not only effectively solves the applicability short board of traditional DC brushless motors in low noise scenarios, but also greatly expands the application field of fan-coil units.

[0004] Currently, conventional magnetic suspension fan-coil units usually adopt a combination design of magnetic suspension motors and centrifugal fans. However, this scheme has some technical bottlenecks in actual application. For example, due to the large size of the magnetic suspension motor, it occupies a lot of return air space, resulting in limited return air area, thereby increasing air resistance and causing poor air duct. In addition, the large size of the motor may also affect the overall structural design of the fan-coil unit, limiting the volume and installation flexibility of the equipment to some extent. These problems restrict the further popularization and optimization of magnetic suspension motors in fan-coil unit systems. SUMMARY

[0005] The present application proposes a magnetic suspension fan and a control method to solve the technical problems of large size and air resistance in the combination of magnetic suspension motors and centrifugal fans in the prior art.

[0006] The technical solution adopted by the present application is:

[0007] The present application proposes a magnetic suspension fan, comprising:

[0008] A volute is provided with a fan blade cavity for installing centrifugal fan blades, and an air outlet is arranged on the side surface of the fan blade cavity. The volute has two openings corresponding to the ends of the fan blade cavity, forming return air inlets.

[0009] The motor assembly is characterized in that the rotor is provided with the centrifugal fan blade at both ends, the stator is provided outside the opening of the volute corresponding to the fan blade cavity and surrounds the rotor, and the stator is connected with the volute through a support;

[0010] A plurality of permanent magnets are arranged around the outer surface of the centrifugal fan blade.

[0011] A plurality of electromagnets are arranged on the inner wall of the fan blade cavity of the volute corresponding to the permanent magnets, and the centrifugal fan blade and the rotor are suspended by the magnetic force of the permanent magnets when the electromagnets are energized.

[0012] Further, a plurality of permanent magnets are arranged around the centrifugal fan blade at the middle position, and the permanent magnets are arranged in an arc shape on the outer surface of the centrifugal fan blade.

[0013] The electromagnets include a first electromagnet arranged below the middle part of the centrifugal fan blade to provide magnetic repulsion, a second electromagnet arranged on the air outlet side of the centrifugal fan blade to provide magnetic repulsion, and a third electromagnet arranged on the inner arc surface of the volute between the first electromagnet and the second electromagnet to provide magnetic attraction.

[0014] Further, a vertical direction position sensor is arranged on the inner wall of the fan blade cavity of the volute above the centrifugal fan blade, and a horizontal direction position sensor is arranged on the air outlet side of the fan blade cavity of the volute.

[0015] The support includes a plurality of connecting rods crossing the return air outlet, one end of the connecting rod is connected to the outer wall surface of the rotor, and the other end is connected to the outer side surface of the volute at both ends.

[0016] The volute includes a cylindrical fan mounting part and a duct part connected to the arc side surface of the fan mounting part; the fan blade cavity is arranged in the inside of the mounting part, the openings are arranged at both ends, and the end of the duct part is the air outlet.

[0017] Further, the fan fixing plate for mounting the volute is also included, the fan fixing plate is a center-symmetrical structure, and the left and right connecting hole positions are arranged on both sides.

[0018] The application also provides a control method of the magnetic suspension fan, which uses the magnetic suspension fan, and includes the following steps:

[0019] When the magnetic suspension fan is started, the first electromagnet below the middle part of the centrifugal fan blade and the second electromagnet on the air outlet side of the centrifugal fan blade on the volute are controlled to be energized to generate repulsive force on the permanent magnet, and the third electromagnet on the inner arc surface of the volute between the first electromagnet and the second electromagnet is controlled to be energized to generate attractive force.

[0020] When the vertical position sensor detects that the centrifugal fan blade deviates from the preset vertical position in the vertical direction after the magnetic suspension fan is started, the first electromagnet is controlled to adjust the magnetic force to make the centrifugal fan blade return to the preset vertical position; when the horizontal position sensor detects that the centrifugal fan blade deviates from the preset horizontal position in the horizontal direction, the second electromagnet is controlled to adjust the magnetic force to make the centrifugal fan blade return to the preset horizontal position.

[0021] Specifically, when the magnetic force of the first electromagnet or the second electromagnet reaches the preset upper limit value or the preset lower limit value in the control process, the third electromagnet is controlled to adjust the magnetic force to make the centrifugal fan blade balanced.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] 1. An integrated magnetic suspension fan is used, without a separate motor, the return air space is increased, the air resistance is reduced, and the efficiency of the fan is improved.

[0024] 2. The scheme of two-side rotation driving and middle magnetic suspension is adopted, the position of the centrifugal fan blade is dynamically adjusted in the state of ensuring the stable rotation of the fan, and the adjustment precision of the magnetic suspension is relatively low.

[0025] 3. A single symmetrical fan fixing plate is matched, the modular assembly of the magnetic suspension fan can be realized, the number of the magnetic suspension fan can be freely increased according to the size of the structure, and the adaptability is greatly enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 is a cross-sectional view of the intermediate position in the embodiment of the present application;

[0028] Figure 2 is a perspective structural view of the specific embodiment of the present application;

[0029] Figure 3 is a top view of the hidden part of the volute of the specific embodiment of the present application;

[0030] Figure 4 is a perspective structural view of the hidden part of the volute of the specific embodiment of the present application;

[0031] Figure 5 is a force direction schematic view of the specific embodiment of the present application;

[0032] 1. Fan fixing plate;

[0033] 2, volute;

[0034] 21, fan mounting portion; 22, air duct portion;

[0035] 3, centrifugal fan blade;

[0036] 4, motor assembly; 41, rotor; 42, stator;

[0037] 5, bracket;

[0038] 6, permanent magnet;

[0039] 7, electromagnet;

[0040] 71, first electromagnet; 72, second electromagnet; 73, third electromagnet;

[0041] 9, return air inlet;

[0042] 10, air outlet;

[0043] 11, vertical direction position sensor; 12, horizontal direction position sensor. DETAILED DESCRIPTION

[0044] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clearly understood, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0045] The principles and structures of the present application will be described in detail below in combination with the drawings and embodiments.

[0046] The conventional magnetic levitation fan coil usually adopts a combination design of magnetic levitation motor and centrifugal fan. However, due to the large size of the magnetic levitation motor, it occupies a large return air space, which limits the return air area, thereby increasing the air resistance and causing the air duct to be not smooth. In addition, the large size of the motor may also affect the overall structural design of the fan coil, so that the volume and installation flexibility of the equipment are limited to a certain extent.

[0047] In this regard, as Figure 1 , 2As shown, the present invention proposes a magnetic levitation fan, comprising: a volute 2, a motor assembly 4, a plurality of permanent magnets 6 and a plurality of electromagnets 7. Among them: a fan blade cavity is provided inside the volute 2 for installing the centrifugal fan blade 3, and the volute 2 forms a return air port 9 at the openings at both ends of the corresponding fan blade cavity to achieve the backflow of external air. The motor assembly 4 specifically includes a rotor 41 and a stator 42. The rotor 41 is arranged at both ends of the centrifugal fan blade 3, that is, a rotor 41 is arranged on each axial side of the centrifugal fan blade 3, thereby forming a symmetrical drive structure. The stator 42 of the motor assembly 4 is fixed to the outside of the volute 2 by a bracket 5, and is arranged around the rotor 41 at the corresponding position (the position of the stator 42 can be directly opposite to the outside of the openings at both ends corresponding to the fan blade cavity). The connection point between the bracket 5 and the volute 2 can be flexibly adjusted according to the installation position of the fan. The plurality of permanent magnets 6 are evenly distributed around the outer surface of the centrifugal fan blade 3, creating basic conditions for the suspension of the centrifugal fan blade 3. Multiple electromagnets 7 are mounted on the inner wall of the fan chamber of the volute 2, corresponding to the permanent magnets 6 on the outer surface of the centrifugal blades 3. When energized, the electromagnets 7 generate a controllable magnetic force, creating a powerful magnetic field interaction with the permanent magnets 6, allowing the centrifugal blades 3 and rotor 41 to levitate without contacting the inner wall of the volute 2. The energization pattern of the electromagnets 7 can be adjusted according to the fan load and speed, ensuring smooth and quiet operation under various operating conditions.

[0048] By providing a suspension structure with corresponding electromagnets 7 and permanent magnets 6 between the inner wall of the volute 2 and the outer surface of the centrifugal blades 3, the centrifugal blades 3 and rotor 41 are suspended contactlessly during operation, eliminating the friction, wear, and noise associated with bearings or impeller support in traditional mechanical transmission structures. Furthermore, the magnetic support of the centrifugal blades 3 enables higher speeds and efficiencies, while maintaining low noise and vibration over long periods of operation.

[0049] As attached Figure 1 、 3 As shown, permanent magnets 6 are evenly distributed in the central surrounding area of ​​the outer surface of the centrifugal blade 3. When viewed axially from the centrifugal blade 3, multiple permanent magnets 6 are arranged in a ring-like pattern, surrounding the blade's circumference and clinging to the outer circumference of the centrifugal blade 3. This ring-shaped arrangement of permanent magnets 6 allows each permanent magnet 6 to create a relatively stable magnetic field in the blade's radial direction. This allows the blade and rotor 41 to be suspended under the action of electromagnets 7 positioned relative to the inner wall of the volute 2.

[0050] By uniformly distributing the permanent magnets 6 in a central annular pattern, they form a continuous and symmetrical magnetic field band around the centrifugal blades 3, improving the balance and stability of the centrifugal blades 3 during high-speed rotation. In the structure shown in the accompanying drawings, the relative positioning of the permanent magnets 6 with respect to the electromagnets 7 ensures that the magnetic force between them remains balanced and controllable, thereby achieving a smooth, low-noise, and highly efficient suspended operation.

[0051] In order to realize the magnetic suspension between the centrifugal fan blades 3 and the volute 2, a plurality of electromagnets 7 are distributed around the inner side of the volute 2, as shown in the attached figure. Figure 1 、 5 As shown, the first electromagnet 71 is located directly below the center of the centrifugal fan blade 3. When viewed from the inside of the volute 2, the first electromagnet 71 is located directly below the volute 2, closely attached to the curved surface of the inner wall of the volute 2. It forms a pair of stable magnetic support points with the corresponding positions of the permanent magnets 6 in the annular distribution, providing a reliable levitation force field for the lower portion of the fan blade, ensuring the fan blade remains stable in the horizontal direction. The second electromagnet 72 is located on the outlet side of the centrifugal fan blade 3, directly to the right in the figure, forming a corresponding magnetic field with the permanent magnets 6 on that side. The second electromagnet 72 mainly provides horizontal support to the left. The third electromagnet 73 is located on the inner curved surface of the volute 2 between the first electromagnet 71 and the second electromagnet 72, located at the lower right in the figure. The third electromagnet 73 is located between the electromagnets 7 on the lower and outlet sides and is arranged along the circumferential curved surface of the inner wall of the volute 2. The third magnetic force provides an attractive force, which keeps the centrifugal fan blade 3 balanced during operation.

[0052] Through the arrangement of the above-mentioned electromagnets 7, the first electromagnet 71, the second electromagnet 72 and the third electromagnet 73 at the intermediate transition position cooperate with each other. The first electromagnet 71 and the second electromagnet provide upward and leftward support forces respectively, and the third electromagnet 73 provides a pulling force to the lower right, so that the centrifugal fan blades 3 remain balanced during rotation.

[0053] In a specific embodiment, Figure 1 As shown, a vertical position sensor 11 is provided on the inner wall of the blade cavity of the volute 2, which is located directly above the centrifugal blade 3, for real-time monitoring of the position changes of the centrifugal blade 3 in the vertical direction. When the blade is rotating at high speed or the load changes, if there is a slight vertical deviation, the sensor will immediately capture the position signal and feed it back to the control unit, thereby ensuring that the supporting force of the first electromagnet 71 is adjusted in time as needed to help the centrifugal blade 3 maintain the set vertical balance point. A horizontal position sensor is also provided at the air outlet side of the blade cavity of the volute 2 facing away from the centrifugal blade 3. The sensor continuously monitors the position changes of the blade in the horizontal direction. When the blade is disturbed by the air flow or the operating conditions change and a horizontal deviation trend occurs, this position sensor transmits the signal to the control unit.

[0054] By installing vertical and horizontal position sensors at corresponding locations on the inner wall of volute 2, in conjunction with the aforementioned layout of electromagnets 7, comprehensive, real-time monitoring and dynamic correction of the operating posture of centrifugal blades 3 are achieved. As a result, regardless of load changes, air volume fluctuations, or speed increases, the fan system can quickly respond and adjust promptly, ensuring that centrifugal blades 3 remain in a stable, balanced suspension state.

[0055] In specific embodiments, as shown in the accompanying drawings, the support 5 comprises a plurality of connecting rods that span the return air opening 9. Figure 4 The connecting rods are visible in the drawings as extending radially outward from the outer wall of the rotor 41, with one end fixedly connected to the outer wall of the rotor 41 and the other end fixed to the outer side surface of the volute 2 at both ends. The support 5 effectively limits and supports the rotor 41 without significantly obstructing the airflow returning through the return air opening 9, ensuring that the overall position of the rotor 41 relative to the volute 2 is accurately constant, thereby providing reliable mechanical support for the stable suspension and efficient operation of the motor assembly 4 and the centrifugal fan blade 3.

[0056] As shown in the accompanying drawings, the volute 2 as a whole comprises two parts: a cylindrical fan mounting portion 21 and a duct portion 22 connected to the arc-shaped side surface of the fan mounting portion 21. Figure 2 The fan mounting portion 21 constitutes the main space of the blade cavity, and openings are provided at both ends of the fan mounting portion 21, which serve as channels for returning air and guiding airflow, allowing air to flow freely back through the blade cavity and ultimately be discharged outward from the duct portion 22. On one side of the fan mounting portion 21, the duct portion 22 connected to the arc-shaped side surface thereof is seen to extend in an arc and form an air outlet 10 at the end. Through the structural layout of the fan mounting portion 21 and the duct portion 22 in cooperation, the entire volute 2 realizes a continuous and smooth airflow path from air return, flow guidance to air outlet, creating a working environment for high-speed, low-noise and high-efficiency operation of the centrifugal fan blade.

[0057] Specifically, as shown in the accompanying drawings, it also includes a fan fixing plate 1, which is a center-symmetric structure with left and right connecting hole positions arranged on both sides, allowing for modular parallel connection of multiple magnetic suspension fans. Figure 2

[0058] The application also proposes a control method for a magnetic suspension fan, using the above-mentioned magnetic suspension fan, comprising the steps of:

[0059] When the fan is started, the control unit will energize the corresponding electromagnets according to the preset logic. By energizing the first electromagnets located below the middle region of the centrifugal fan blade and the second electromagnets located at the air outlet side of the centrifugal fan blade, the electromagnets interact with the permanent magnets arranged around the outer surface of the centrifugal fan blade to generate repulsive force. The third electromagnets distributed on the inner arc surface of the volute between the first and second electromagnets are energized to generate attractive force between them and the permanent magnets. Through the dynamic balance of repulsive and attractive forces, the centrifugal fan blade can obtain stable suspension support and centering positioning during the starting stage.

[0060] ​In this stage, the current size and energizing sequence of the electromagnets can be appropriately adjusted, and the control unit can ensure that the fan blade avoids sudden swinging or deviation during startup and smoothly transitions to the normal rotating state. This distributed and multi-point electromagnetic control method also facilitates fine adjustment of the magnetic force through sensor feedback information during subsequent operation, thereby achieving continuous low-noise, low-vibration, and high-energy-efficiency suspension operation after the fan blade gradually speeds up and reaches the designed rotating speed.

[0061] Specifically, when the vertical position sensor detects that the centrifugal fan blade deviates from the preset vertical position in the vertical direction, the control unit immediately responds and appropriately adjusts the magnetic force applied to the first electromagnet. By increasing or decreasing the energizing current of the electromagnet, the force between the electromagnet and the permanent magnet is correspondingly changed, thereby re-directing the centrifugal fan blade back to the set balance point in the vertical direction.

[0062] Specifically, after the magnetic suspension fan enters the stable running stage, when the horizontal position sensor detects that the centrifugal fan blade deviates from the preset horizontal position, the control unit appropriately increases or decreases the energizing current of the second electromagnet to precisely correct the force between the second electromagnet and the permanent magnet in the horizontal direction, thereby re-directing the centrifugal fan blade back to the set horizontal balance point.

[0063] In this way, regardless of changes in air volume, rotating speed fluctuations, or system load changes, the centrifugal fan blade can always maintain a stable relative position in the horizontal direction. This control can effectively reduce operating noise and vibration, and improve operating energy efficiency and long-term reliability.

[0064] Under normal operating conditions, when the centrifugal fan blade has a slight vertical or horizontal position deviation, the control system first attempts to adjust the magnetic force of the first electromagnet or the second electromagnet to re-center the fan blade. At this time, if the magnetic force output of the first electromagnet and the second electromagnet is still within the preset adjustable range (i.e., does not reach the preset upper or lower limit), the third electromagnet does not need to be introduced for intervention, and the system can rely on the flexible adjustment of the first electromagnet or the second electromagnet to quickly restore the balance state.

[0065] When the first electromagnet or the second electromagnet continuously increases or decreases the magnetic force output to correct the fan blade position deviation and finally reaches the preset upper or lower limit, the balance position of the fan blade is still deviated. By applying a corresponding current to the third electromagnet to adjust its magnetic attraction, the magnetic force of the three electromagnets is prevented from increasing or decreasing indefinitely.

[0066] Through the multi-stage control strategy, when the fan faces complex working conditions or sudden load changes, the system can flexibly call on the adjustment capabilities of different electromagnets to maintain stable magnetic suspension balance of the centrifugal fan blade in the vertical and horizontal directions. This improves the reliability and stability of the fan during long-term operation.

[0067] The specific adjustment is implemented as follows:

[0068] The position detection of the centrifugal fan blade is completed by a vertical position sensor and a horizontal position sensor installed on the inner wall of the volute. The vertical position sensor is used to detect the position deviation of the centrifugal fan blade in the vertical direction, and the horizontal position sensor is used to detect the position deviation of the centrifugal fan blade in the horizontal direction. The centrifugal fan blade should be near the set horizontal center distance A and vertical center distance B during normal operation, and the allowable error range is controlled within ±1 mm.

[0069] In terms of coordinate definition, the centrifugal fan blade is set to be positive when deviating upward in the vertical direction and negative when deviating downward; it is set to be positive when deviating left in the horizontal direction and negative when deviating right. During the magnetic adjustment process, the three electromagnets mentioned above are used:

[0070] According to the deviation of the centrifugal fan blade in the vertical and horizontal directions, the corresponding electromagnet magnetic force is adjusted as follows:

[0071] When the centrifugal fan blade deviates downward (negative) in the vertical direction:

[0072] If it also deviates right (negative) in the horizontal direction, the magnetic force of the third electromagnet (the electromagnet below the right) is kept unchanged, the magnetic forces of the first electromagnet (the electromagnet below the left) and the second electromagnet (the electromagnet to the right) are increased to correct the centrifugal fan blade to the left and upward direction.

[0073] If it deviates left (positive) in the horizontal direction, the magnetic force of the third electromagnet is kept unchanged, the magnetic force of the first electromagnet is increased to support upward, and the magnetic force of the second electromagnet is reduced, so that the fan blade is adjusted to the right horizontal position while being lifted, and gradually returns to the preset balance point.

[0074] When the centrifugal fan blade deviates upward (positive) in the vertical direction:

[0075] If it deviates right (negative) in the horizontal direction, the magnetic force of the third electromagnet is kept unchanged, the magnetic force of the first electromagnet is reduced (to slightly lower the fan blade), and the magnetic force of the second electromagnet is increased (to correct the fan blade to the left in the horizontal direction).

[0076] If it deviates left (positive) in the horizontal direction, the magnetic force of the third electromagnet is kept unchanged, the magnetic forces of the first electromagnet and the second electromagnet are reduced, so that the centrifugal fan blade is slightly adjusted downward in the vertical and horizontal directions, and returns to the balance position.

[0077] In the above adjustment process, in order to prevent the magnetic force of the first electromagnet and the second electromagnet from increasing or decreasing infinitely, the system sets upper and lower limit values for the magnetic force output thereof. When the magnetic force of the first electromagnet or the second electromagnet reaches the preset upper limit value or lower limit value in the adjustment, and the centrifugal fan blade has not yet returned to the central balance completely, a third electromagnet is introduced to compensate. At this time, the third electromagnet increases or decreases its magnetic force to help fine-tune the fan blade to the predetermined central position, forming a dynamic balance relationship among the three electromagnets. The fan blade position can be accurately maintained within the set ±1mm error in a larger working condition range, ensuring long-term high-efficiency, low-noise, and low-vibration operation of the fan.

[0078] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal", and "top, bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0079] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper", and the like can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0080] In addition, it should be noted that the use of the words "first", "second", and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0081] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A magnetic levitation fan, characterized in that: include: The volute has a blade cavity inside for installing centrifugal blades, and is provided with an air outlet connected to the side of the blade cavity, and the two ends of the volute corresponding to the blade cavity are opened to form a return air outlet; A motor assembly, wherein the rotor is provided at both ends of the centrifugal fan blade, the stator is provided outside the openings at both ends of the volute corresponding to the fan blade cavity and surrounds the rotor, and the stator and the volute are connected by a bracket; A plurality of permanent magnets are arranged around the outer surface of the centrifugal fan blade; A plurality of electromagnets are arranged on the inner wall of the fan blade cavity of the volute corresponding to the permanent magnets, and when energized, the centrifugal fan blades and the rotor are suspended by the magnetic force of the permanent magnets; A circle of permanent magnets is arranged around the middle of the centrifugal fan blade, and the permanent magnets are attached to the outer surface of the centrifugal fan blade in an arc shape; The electromagnets include: a first electromagnet located below the middle of the centrifugal fan blade to provide magnetic repulsion, a second electromagnet located on the air outlet side of the centrifugal fan blade to provide magnetic repulsion, and a third electromagnet located on the inner arc surface of the volute between the first electromagnet and the second electromagnet to provide magnetic attraction; A vertical position sensor is provided on the inner wall of the blade cavity of the volute directly above the centrifugal blades, and a horizontal position sensor is provided on the air outlet side of the blade cavity of the volute facing away from the centrifugal blades.

2. The magnetic levitation fan according to claim 1, characterized in that: The bracket includes a plurality of connecting rods spanning the return air port, one end of the connecting rod is connected to the outer wall surface of the rotor, and the other end is connected to the outer side surfaces of both ends of the volute.

3. The magnetic levitation fan according to claim 1, characterized in that: The volute includes: a cylindrical fan mounting portion, and an air duct portion connected to the arc-shaped side surface of the fan mounting portion; the fan blade cavity is arranged inside the mounting portion, the openings are arranged at both ends, and the end of the air duct portion is the air outlet.

4. The magnetic levitation fan according to claim 1, characterized in that: Also includes: The fan fixing plate of the volute is installed. The fan fixing plate is a centrally symmetrical structure, and left and right connecting holes are arranged on both sides.

5. A control method for a magnetic levitation fan, characterized in that: Using the magnetic levitation blower according to any one of claims 1 to 4 comprises the following steps: When the magnetic levitation fan is started, the first electromagnet located below the middle of the centrifugal fan blade on the volute and the second electromagnet located on the air outlet side of the centrifugal fan blade are energized to generate a repulsive force on the permanent magnet, and the third electromagnet located on the inner curved surface of the volute between the first electromagnet and the second electromagnet is energized to generate an attractive force.

6. The control method of the magnetic levitation fan according to claim 5, characterized in that: After the magnetic levitation fan is started, when the vertical position sensor detects that the centrifugal fan blades deviate from the preset vertical position in the vertical direction, the first electromagnet is controlled to adjust the magnetic force to return the centrifugal fan blades to the preset vertical position; when the horizontal position sensor detects that the centrifugal fan blades deviate from the preset horizontal position in the horizontal direction, the second electromagnet is controlled to adjust the magnetic force to return the centrifugal fan blades to the preset horizontal position.

7. The control method of the magnetic levitation fan according to claim 5, characterized in that: When the magnetic force of the first electromagnet or the second electromagnet reaches a preset upper limit or a preset lower limit during the control process, the magnetic force is adjusted by controlling the third electromagnet to keep the centrifugal fan blade centered and balanced.

Images