Shaftless magnetic levitation fan, device and control method

Abstract

The application discloses an axis-free magnetic suspension type fan, equipment and a control method, and is characterized by comprising a cylinder frame, a radial magnetic force ring, a stator, a permanent magnet rotor, a first axial magnetic force ring and a second axial magnetic force ring; the permanent magnet rotor is provided with an annular suspension gap relative to the cylinder frame; the radial magnetic force ring is used for generating radial magnetic force on the circumferential direction of the permanent magnet rotor and making the permanent magnet rotor magnetically suspended in the cylinder frame and kept concentric; the stator is used for driving the permanent magnet rotor to rotate; the first axial magnetic force ring and the permanent magnet rotor repel each other and are provided with a first axial suspension gap; the second axial magnetic force ring and the permanent magnet rotor repel each other and are provided with a second axial suspension gap; the permanent magnet rotor is provided with a wind hole in the center, and the inner wall of the wind hole is provided with blades. The application can generate axial wind power through the radial and axial magnetic suspension movement of the permanent magnet rotor, and has the advantages of axis-free transmission, no friction, low noise, small loss and the like.

Description

Technical Field

[0001] This invention relates to a shaftless magnetic levitation fan, equipment, and control method. Background Technology

[0002] Axial flow fans have a wide range of applications; they direct airflow in the same direction as the fan blades' axis, such as in electric fans and air conditioner outdoor unit fans. Conventional axial flow fans are driven by a motor, which is fixed inside the fan casing by a motor bracket. The motor's output shaft is coaxially connected to the fan blades via a drive shaft, driving the blades to rotate within the fan casing and generate axial airflow (see CN113417873A, CN109611359 A). Because existing axial flow fans have the motor and drive shaft inside the fan casing (air duct or air vent), they occupy internal space, reduce airflow, and increase air resistance. Another publicly disclosed patent, CN208203623U (Electrically Driven Torque Self-Balancing Shaftless Ducted Fan or Shaftless Ducted Blade for Aircraft), includes a stator component and a rotor component. The stator component is mounted on a duct frame, and the rotor component is connected to the duct frame via bearings or guide rails. The stator component includes an armature installed inside the duct frame and a controller fixed to the duct frame. The armature and controller are electrically connected, and the controller controls the alternating magnetic field generated when energized to drive the rotor component to rotate. The rotor component includes a rotor frame, permanent magnets, and blades. The permanent magnets are fixed to the outer wall of the rotor frame, and the blades are fixed to the inner wall of the rotor frame. During operation, the stator component drives the rotor component to rotate, and the rotation of the blades within the rotor component generates axial airflow. Its shaftless design overcomes the shortcomings of the aforementioned shaft-driven axial flow fans, but it still has the following deficiencies, which are analyzed below: Because its rotor components are connected to the duct frame through bearings or guide rails, they have inherent defects such as high energy consumption, high noise, need for lubrication, and short lifespan due to mutual contact and mechanical friction during rotation; thus, they cannot meet the higher requirements of frictionless operation, low energy consumption, no lubrication, ultra-quiet operation, no wear, and long lifespan. Utility Model Content

[0003] This invention provides a shaftless magnetic levitation fan to solve the problems of small air volume and high resistance caused by the internal space occupied in the air duct (air channel or air hole) in the shafted type. It also solves the problems of high energy consumption, high noise, need for lubrication and short life of the rotor (or rotor component) and stator due to mechanical friction in the shaftless type.

[0004] To achieve the above objectives, the present invention provides a shaftless magnetic levitation fan, characterized in that it comprises a frame, a radial magnetic ring, a stator, a permanent magnet rotor, a first axial magnetic ring, and a second axial magnetic ring; the permanent magnet rotor is located within the frame, and an annular suspension gap exists between the permanent magnet rotor and the frame; the radial magnetic ring and the stator are fixed to the frame, and the radial magnetic ring generates radial magnetic force on the circumference of the permanent magnet rotor, causing it to magnetically levitate within the frame and remain concentric; the stator drives the permanent magnet rotor to rotate; the first axial magnetic ring and the second axial magnetic ring are fixed to the frame and located on opposite axial sides of the permanent magnet rotor; the first axial magnetic ring repels the permanent magnet rotor and has a first axial suspension gap, and the second axial magnetic ring repels the permanent magnet rotor and has a second axial suspension gap; the permanent magnet rotor has a central air vent, and the inner wall of the air vent has blades or other structures that can generate wind during rotation.

[0005] With the above scheme, during operation, the stator drives the permanent magnet rotor to rotate within the cylinder, and the blades or other structures within the permanent magnet rotor that can generate wind during rotation move along with it and generate axial wind force within their wind holes.

[0006] First, since there are no motor brackets, motors, and transmission shafts in the air vents as in existing technologies, the air vents operate without a shaft and do not occupy space in the air duct. Therefore, the air volume can be increased and the air resistance can be reduced. This solves the problems of small air volume and high resistance that exist in the case of shaft-driven air vents (or air ducts or air vents) due to the occupation of internal space. Secondly, since the radial magnetic ring is used to generate radial magnetic force on the circumference of the permanent magnet rotor and make it magnetically levitate within the cylinder and remain concentric, and there is an annular suspension gap between the permanent magnet rotor and the cylinder, the permanent magnet rotor is radially suspended and spaced apart from the cylinder and does not contact it circumferentially. This can achieve radial and circumferential magnetic levitation and concentric rotation without contact or mechanical friction. This can solve the problems of high energy consumption, large influence of temperature changes on the fit, high noise, need for lubrication, and short lifespan caused by mechanical friction between the rotor (or rotor components) and the stator in the existing shaftless method. Third, because the first axial magnetic ring and the permanent magnet rotor repel each other and have a first axial suspension gap, and the second axial magnetic ring and the permanent magnet rotor repel each other and have a second axial suspension gap; the permanent magnet rotor is axially suspended and bidirectionally repelled, therefore the permanent magnet rotor will not axially collide or come into contact with the first and second axial magnetic rings, which solves the problem of high noise if the permanent magnet rotor axially jumps and collides. The permanent magnet rotor achieves fully suspended, collision-free movement without axial and radial contact or mechanical friction, achieving an ultra-low noise effect.

[0007] When generating axial wind force, the permanent magnet rotor is axially suspended and there is no mechanical friction on both sides of the axis at the same time. Therefore, it can achieve full radial and axial suspension, which can meet higher requirements such as no mechanical friction, low energy consumption, no lubrication, no noise, and long service life.

[0008] Preferably, the first axial magnetic ring and / or the second axial magnetic ring are axial magnetic coils. During operation, when the rotational speed of the permanent magnet rotor changes, the axial magnetic force generated by the first axial magnetic ring and / or the second axial magnetic ring also changes accordingly, so that the sizes of the first axial suspension gap and the second axial suspension gap remain constant. Since the blades or other structures within the permanent magnet rotor that generate wind during rotation produce axial recoil, the axial magnetic force variation of the first axial magnetic ring and / or the second axial magnetic ring using axial magnetic coils can suppress and counteract this recoil. This particularly solves the problem that the axial runout of the permanent magnet rotor becomes very significant when the rotational speed changes (especially with sudden gear shifts).

[0009] Preferably, the blades are multiple and evenly distributed circumferentially.

[0010] Furthermore, the tips of each blade extend to the center and are joined together.

[0011] Preferably, both the radial magnetic ring and the stator have multiple rings that are distributed at intervals along the axial direction of the cylinder frame; the first axial magnetic ring and the second axial magnetic ring are alternately distributed within the cylinder frame.

[0012] Preferably, the cylinder frame includes an outer cover cylinder and an inner liner cylinder; the outer cover cylinder has an air inlet, an assembly cavity, and an air outlet, and the first axial magnetic ring and the second axial magnetic ring are respectively clamped at both ends within the assembly cavity; the inner liner cylinder is located within the assembly cavity and is sandwiched between the first axial magnetic ring and the second axial magnetic ring; the radial magnetic ring and the stator are sandwiched between the outer wall of the inner liner cylinder and the inner wall of the outer cover cylinder; the permanent magnet rotor includes a first ring body, in which a permanent magnet is embedded; there is an annular suspension gap between the outer wall of the first ring body and the inner wall of the inner liner cylinder; the inner wall of the inner liner cylinder is provided with a limiting ring groove; a mating ring is provided on the outer wall of the first ring body, which is inserted into the limiting ring groove without contact.

[0013] Preferably, the outer cover cylinder includes two half-outer cover cylinders that can be docked and fixed together; the inner liner cylinder includes an upper liner cylinder and a lower liner cylinder that can be nested together. The upper liner has a first sleeve and a first outer protruding ring, the first outer protruding ring being disposed at the upper end of the first sleeve; the lower liner has a second sleeve, a second outer protruding ring, and a second inner protruding ring; the second inner protruding ring is disposed in the middle of the second sleeve, and the second outer protruding ring is disposed at the lower end of the second sleeve; the second sleeve is fitted over the first sleeve, the upper end face of the second sleeve abutting against the lower side face of the first outer protruding ring; an outer retaining ring groove is formed between the lower side face of the first outer protruding ring and the upper side face of the second outer protruding ring; the radial magnetic ring and the stator are clamped in the outer retaining ring groove and cannot be axially displaced; the limiting ring groove is formed between the lower end face of the first sleeve and the upper side face of the second inner protruding ring.

[0014] The present invention also discloses a device having a shaftless magnetic levitation fan as described in any of the above technical solutions.

[0015] Preferably, the device can be any one of a fan, aircraft, vacuum cleaner, drone, air conditioner or robot vacuum cleaner, hair dryer, exhaust fan, range hood, air purifier, underwater silent propeller, laptop cooling fan, mobile phone cooling fan or desktop computer cooling fan.

[0016] This invention also discloses a control method for controlling a shaftless magnetic levitation fan as described in any of the above technical solutions, characterized in that: (a) Initially, the permanent magnet rotor is concentric with the radial magnetic ring, and the annular suspension gap between the permanent magnet rotor and the cylinder is uniform in the circumferential direction; The first axial suspension gap between the first axial magnetic ring and the permanent magnet rotor and the second axial suspension gap between the second axial magnetic ring and the permanent magnet rotor are equal; The sum of the force vectors between the first axial magnetic force generated between the first axial magnetic ring and the permanent magnet rotor and the second axial magnetic force generated between the second axial magnetic ring and the permanent magnet rotor is zero. (b) During operation, the permanent magnet rotor performs a suspended rotational motion, and the blade generates axial wind in the wind hole as the permanent magnet rotor moves; at this time, the permanent magnet rotor is subjected to a recoil force opposite to the wind direction; then, by adjusting the size of the first axial magnetic ring and / or the second axial magnetic ring, the sum of the force vectors between the first axial magnetic force, the second axial magnetic force and the recoil force is made zero.

[0017] The beneficial effects of this invention are: First, the present invention can realize shaftless magnetic levitation rotation to generate axial wind force, which has the advantages of not occupying the space in the air duct, increasing air volume and reducing wind resistance. Secondly, this invention can achieve full radial and axial suspension of the permanent magnet rotor, which can meet higher requirements such as no mechanical friction, low energy consumption, no axial runout, no vibration, no lubrication, no noise, and long service life. Third, the present invention addresses the issue that the axial recoil force generated by the rotation of blades or other structures that can generate wind during rotation within the permanent magnet rotor. By using the axial magnetic force variation of the axial magnetic coil through the first axial magnetic ring and / or the second axial magnetic ring, the recoil force can be suppressed and offset. In particular, it solves the problem that the axial runout of the permanent magnet rotor is very obvious when the rotational speed of the permanent magnet rotor changes (especially when the gear changes abruptly). Fourth, the present invention can be applied to the device, such as a fan, aircraft, vacuum cleaner, drone, air conditioner, or sweeping robot, and can improve the overall performance; Fifth, the first axial magnetic ring, the second axial magnetic ring, the radial magnetic ring, the stator and the permanent magnet rotor inside the cylinder frame of the present invention can be quickly assembled, and at the same time have the advantages of simple assembly, ingenious structure, not easy to loosen, and long-term reliable and stable performance. Sixth, this invention has the advantages of energy saving, high rotation speed (large air volume), ability to be made into ultra-small wind power devices, wide applicability, and many technology transfers. Attached Figure Description

[0018] Figure 1 This is a front cross-sectional view of a shaftless magnetic levitation fan according to Embodiment 1 of the present invention.

[0019] Figure 2 This is a half-sectional perspective view of a shaftless magnetic levitation fan according to Embodiment 1 of the present invention.

[0020] Figure 3 This is a top view of a shaftless magnetic levitation fan according to Embodiment 1 of the present invention.

[0021] Figure 4 This is a perspective view of a shaftless magnetic levitation fan according to Embodiment 1 of the present invention.

[0022] Figure 5 This is a front cross-sectional view of a shaftless magnetic levitation fan according to Embodiment 2 of the present invention.

[0023] Figure 6 This is a half-sectional perspective view of a shaftless magnetic levitation fan according to Embodiment 2 of the present invention.

[0024] Figure 7 This is a front cross-sectional view of a shaftless magnetic levitation fan according to Embodiment 3 of the present invention.

[0025] Figure 8 This is a half-sectional perspective view of a shaftless magnetic levitation fan according to Embodiment 3 of the present invention.

[0026] Figure 9 This is an exploded view of a shaftless magnetic levitation fan according to Embodiment 3 of the present invention.

[0027] Figure 10 This is a perspective view of the outer cover cylinder in Embodiment 3 of the present invention.

[0028] Figure 11 This is a perspective view of the inner liner cylinder in Embodiment 3 of the present invention.

[0029] Figure 12 This is a half-sectional perspective view of the inner liner, radial magnetic ring, stator and permanent magnet rotor body in the assembled state in Embodiment 3 of the present invention.

[0030] Figure 13 This is a perspective view of a shaftless magnetic levitation fan permanent magnet rotor according to Embodiment 4 of the present invention.

[0031] Figure 14 This is a half-sectional perspective view of a device in Embodiment 5 of the present invention. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example 1: See Figure 1-4 A shaftless magnetic levitation fan includes a frame 1, a radial magnetic ring 2, a stator 3, a permanent magnet rotor 4, a first axial magnetic ring 5, and a second axial magnetic ring 6. The permanent magnet rotor 4 is located inside the cylindrical frame 1, and there is an annular suspension gap K between the permanent magnet rotor 4 and the cylindrical frame 1; the radial magnetic ring 2 and the stator 3 are fixed on the cylindrical frame 1, and the radial magnetic ring 2 is used to generate radial magnetic force on the circumference of the permanent magnet rotor 4 and make it magnetically levitate within the cylindrical frame 1 and keep it concentric, and the stator 3 is used to drive the permanent magnet rotor 4 to rotate; the first axial magnetic ring 5 and the second axial magnetic ring 6 are fixed on the cylindrical frame 1 and are respectively located on both sides of the axial direction of the permanent magnet rotor 4; the first axial magnetic ring 5 and the permanent magnet rotor 4 repel each other and have a first axial suspension gap M-1, and the second axial magnetic ring 6 and the permanent magnet rotor 4 repel each other and have a second axial suspension gap M-2; the permanent magnet rotor 4 has a wind hole 4-1 at its center, and the inner wall of the wind hole 4-1 has a blade 4-2 or other structure that can generate wind when rotating (such as a propeller or fan blade).

[0033] Preferably, the radial magnetic ring 2 and the stator 3 are fixed as one unit.

[0034] Specifically, the blades 4-2 are multiple (e.g., 4) and are evenly distributed circumferentially.

[0035] During operation, the stator 3 drives the permanent magnet rotor 4 to rotate within the cylinder frame 1, and each blade 4-2 (or other structure that can generate wind when rotating) within the permanent magnet rotor 4 moves along with it and generates axial wind force within its wind holes 4-1.

[0036] First, since there are no motor brackets, motors and transmission shafts in the air hole 4-1 as in the prior art, the air hole 4-1 operates without a shaft and does not occupy the space in the air duct. Therefore, the air volume can be increased and the air resistance can be reduced. This solves the problem of the air hole having internal space occupied, resulting in small air volume and large resistance when there is a shaft. Secondly, since the radial magnetic ring 2 is used to generate radial magnetic force on the circumference of the permanent magnet rotor 4 and make it magnetically levitate within the cylinder 1 and remain concentric, and there is an annular suspension gap K between the permanent magnet rotor 4 and the cylinder 1, the permanent magnet rotor 4 is radially suspended and spaced apart from the cylinder 1 and does not contact it circumferentially. It can achieve radial and circumferential magnetic suspension and concentric rotation without contact or mechanical friction. This can solve the problems of high energy consumption, large influence of temperature changes on the fit, high noise, need for lubrication, and short life of the rotor and stator in the existing shaftless method. Third, because the first axial magnetic ring 5 and the permanent magnet rotor 4 repel each other and have a first axial suspension gap M-1, and the second axial magnetic ring 6 and the permanent magnet rotor 4 repel each other and have a second axial suspension gap M-2; the permanent magnet rotor 4 is axially suspended and bidirectionally repelled, therefore the permanent magnet rotor 4 will not axially collide or come into contact with the first axial magnetic ring 5 and the second axial magnetic ring 6, which solves the problem of high noise if the permanent magnet rotor 4 axially jumps and collides. Furthermore, the permanent magnet rotor 4 achieves fully suspended, collision-free movement without axial and radial contact or mechanical friction, resulting in ultra-low noise.

[0037] When generating axial wind force, the permanent magnet rotor 4 is axially suspended and there is no mechanical friction on both sides of the axial direction. Therefore, it can achieve full radial and axial suspension, which can meet higher requirements such as no mechanical friction, low energy consumption, no lubrication, no noise, and long service life.

[0038] If the first axial magnetic ring 5 and the second axial magnetic ring 6 are permanent magnets, when the speed of the permanent magnet rotor 4 changes (increases or decreases), the axial wind force changes proportionally. The recoil force F3 experienced by the permanent magnet rotor 4 is the same in magnitude but opposite in direction to the axial wind force. That is, when the speed of the permanent magnet rotor 4 increases, the recoil force F3 experienced by the permanent magnet rotor 4 increases, and when the speed of the permanent magnet rotor 4 decreases, the recoil force F3 experienced by the permanent magnet rotor 4 decreases. At this time, the permanent magnet rotor 4 will have axial suspension jump displacement compensation. At the same time, the size of the first axial suspension gap M-1 and the second axial suspension gap M-2 will also change (i.e., h1 and h2). The working state is not stable enough, and there are problems of axial jump, vibration and loud noise. This problem is more obvious when the permanent magnet rotor 4 rotates in a skipped gear (non-uniform change).

[0039] To address the issue of axial runout of the permanent magnet rotor 4 caused by variations in the magnitude of the recoil force F3, the first axial magnetic ring 5 and / or the second axial magnetic ring 6 employ axial magnetic coils. During operation, as the rotational speed of the permanent magnet rotor 4 changes, the axial magnetic force generated by the first axial magnetic ring 5 and / or the second axial magnetic ring 6 also changes accordingly, ensuring that the sizes of the first axial suspension gap M-1 and the second axial suspension gap M-2 remain constant. Since the blades 4-2 (or other structures that generate airflow during rotation) within the permanent magnet rotor 4 generate axial recoil, the axial magnetic force variation achieved by the axial magnetic coils of the first axial magnetic ring 5 and / or the second axial magnetic ring 6 effectively suppresses and counteracts the recoil force F3.

[0040] The following control methods can be used during operation. (a) Initially, the permanent magnet rotor 4 is concentric with the radial magnetic ring 2, and the annular suspension gap K between the permanent magnet rotor 4 and the cylinder frame 1 is uniform in the circumferential direction; The first axial suspension gap M-1 between the first axial magnetic ring 5 and the permanent magnet rotor 4 and the second axial suspension gap M-2 between the second axial magnetic ring 6 and the permanent magnet rotor 4 are equal; The sum of the force vectors between the first axial magnetic force F1 generated between the first axial magnetic ring 5 and the permanent magnet rotor 4 and the second axial magnetic force F2 generated between the second axial magnetic ring 6 and the second axial suspension gap M-2 between the permanent magnet rotor 4 is zero. (b) During operation, the permanent magnet rotor 4 performs a suspended rotational motion, and the blade 4-2 generates axial wind in the wind hole 4-1 as the permanent magnet rotor 4 moves; at this time, the permanent magnet rotor 4 is subjected to a recoil force F3 opposite to the wind direction; then, by adjusting the size of the first axial magnetic ring 5 and / or the second axial magnetic ring 6, the sum of the force vectors among the first axial magnetic force F1, the second axial magnetic force F2 and the recoil force F3 is made zero.

[0041] The adjustment method in (b) can be any of the following: As the first method (1): The first axial magnetic ring 5 is an axial magnetic coil, and the second axial magnetic ring 6 is a permanent magnet. Their adjustment methods are as follows: When the rotational speed of the permanent magnet rotor 4 is constant (i.e., the current or voltage remains constant), the recoil force F3 on the permanent magnet rotor 4 remains constant, and the first axial magnetic force (F1) generated by controlling the first axial magnetic ring 5 (with constant current or voltage) remains constant. At this time, the sum of the force vectors among the first axial magnetic force F1 (constant), the second axial magnetic force F2 (constant), and the recoil force F3 (constant) is zero. The permanent magnet rotor 4 is in axial force balance and will remain in its original axial position without axial jump. The first axial suspension gap M-1 and the second axial suspension gap M-2 are constant in size (i.e., h1 and h2 remain constant, and the axial position of the permanent magnet rotor 4 remains unchanged). When the rotational speed of the permanent magnet rotor 4 increases (current or voltage increases), the recoil force F3 on the permanent magnet rotor 4 increases. At the same time, the first axial magnetic force (F1) generated by controlling the first axial magnetic ring 5 (current or voltage decreases) decreases, and the amount of decrease is consistent with the amount of increase in the recoil force F3. The sum of the force vectors among the first axial magnetic force F1 (decreases), the second axial magnetic force F2 (remains unchanged), and the recoil force F3 (increases) is still zero. The permanent magnet rotor 4 is in axial force balance and will maintain its original axial position without axial jump. The first axial suspension gap M-1 and the second axial suspension gap M-2 are constant in size (i.e., h1 and h2 remain unchanged, and the axial position of the permanent magnet rotor 4 remains unchanged). When the rotational speed of the permanent magnet rotor 4 decreases (current or voltage decreases), the recoil force F3 experienced by the permanent magnet rotor 4 also decreases. The first axial magnetic force (F1) generated by controlling the first axial magnetic ring 5 (current or voltage increases) increases, and its increase is consistent with the decrease of the recoil force F3. The sum of the force vectors among the first axial magnetic force F1 (increase), the second axial magnetic force F2 (unchanged), and the recoil force F3 (decrease) is zero. The permanent magnet rotor 4 is in axial force balance and will remain in its original axial position without axial jumping. The size of the first axial suspension gap M-1 and the second axial suspension gap M-2 is constant (i.e., h1 and h2 remain unchanged, and the axial position of the permanent magnet rotor 4 remains unchanged).

[0042] As the second method (2): The second axial magnetic ring 6 uses an axial magnetic coil, while the first axial magnetic ring 5 is a permanent magnet. Its adjustment method is as follows: When the rotational speed of the permanent magnet rotor 4 is constant (i.e., the current or voltage remains constant), the recoil force F3 on the permanent magnet rotor 4 remains constant, and the second axial magnetic force (F2) generated by controlling the second axial magnetic ring 6 (with the current or voltage remaining constant) remains constant. At this time, the sum of the force vectors among the first axial magnetic force F1 (constant), the second axial magnetic force F2 (constant), and the recoil force F3 (constant) is zero. The permanent magnet rotor 4 is in axial force balance and will remain in its original axial position without axial jump. The size of the first axial suspension gap M-1 and the second axial suspension gap M-2 is constant (i.e., h1 and h2 remain constant, and the axial position of the permanent magnet rotor 4 remains unchanged). When the rotational speed of the permanent magnet rotor 4 increases (current or voltage increases), the recoil force F3 experienced by the permanent magnet rotor 4 increases. At the same time, the axial magnetic force (F3) generated by controlling the second axial magnetic ring 6 (current or voltage increases) increases, and its increase is consistent with the increase of the recoil force F3. The sum of the force vectors among the first axial magnetic force F1 (unchanged), the second axial magnetic force F2 (increased), and the recoil force F3 (increased) remains zero. The permanent magnet rotor 4 is in axial force balance and will maintain its original axial position without axial jump. The first axial suspension gap M-1 and the second axial suspension gap M-2 are constant in size (i.e., h1 and h2 are unchanged, and the axial position of the permanent magnet rotor 4 remains unchanged). When the rotational speed of the permanent magnet rotor 4 decreases (current or voltage decreases), the recoil force F3 experienced by the permanent magnet rotor 4 decreases. At the same time, the axial magnetic force (F3) generated by controlling the second axial magnetic ring 6 (current or voltage decreases) decreases, and the amount of decrease is consistent with the amount of decrease in the recoil force F3. The sum of the force vectors among the first axial magnetic force F1 (unchanged), the second axial magnetic force F2 (decreased), and the recoil force F3 (decreased) remains zero. The permanent magnet rotor 4 is in axial force balance and will maintain its original axial position without axial jump. The first axial suspension gap M-1 and the second axial suspension gap M-2 are constant in size (i.e., h1 and h2 remain unchanged, and the axial position of the permanent magnet rotor 4 remains unchanged). As a third (3) method: The second axial magnetic ring 6 is an axial magnetic coil, and the first axial magnetic ring 5 is an axial magnetic coil. Their adjustment method is as follows: When the rotational speed of the permanent magnet rotor 4 is constant (i.e., the current or voltage remains constant), the recoil force F3 on the permanent magnet rotor 4 remains constant, and the second axial magnetic force (F2) generated by controlling the second axial magnetic ring 6 (with the current or voltage remaining constant) remains constant. At this time, the sum of the force vectors among the first axial magnetic force F1 (constant), the second axial magnetic force F2 (constant), and the recoil force F3 (constant) is zero. The permanent magnet rotor 4 is in axial force balance and will remain in its original axial position without axial jump. The size of the first axial suspension gap M-1 and the second axial suspension gap M-2 is constant (i.e., h1 and h2 remain constant, and the axial position of the permanent magnet rotor 4 remains unchanged). When the rotational speed of the permanent magnet rotor 4 changes, the recoil force F3 experienced by the permanent magnet rotor 4 also changes. At the same time, by controlling the size of the first axial magnetic ring 5 and / or the second axial magnetic ring 6, and making the sum of the force vectors of the first axial magnetic force F1, the second axial magnetic force F2, and the recoil force F3 zero, the permanent magnet rotor 4 will be in axial force balance and will maintain its original axial position without axial jumping. The size of the first axial suspension gap M-1 and the second axial suspension gap M-2 is constant (i.e., h1 and h2 remain unchanged, and the axial position of the permanent magnet rotor 4 remains unchanged).

[0043] This control method solves the problem of axial suspension and bouncing of the permanent magnet rotor 4 caused by changes in wind force resulting from changes in rotational speed. Because this control method ensures that the sum of the force vectors of the first axial magnetic force F1, the second axial magnetic force F2, and the recoil force F3 on the permanent magnet rotor 4 remains zero, the permanent magnet rotor 4 will not axially suspend or bounce regardless of its initial state, speed change state, or gear shift state. Simultaneously, the first axial suspension gap M-1 and the second axial suspension gap M-2 remain constant (i.e., h1 and h2), guaranteeing stable operation and eliminating problems such as axial bouncing, vibration, and excessive noise. Therefore, it can achieve full radial and axial suspension, meeting higher requirements such as no axial bouncing, no vibration, and no noise.

[0044] Example 2: This example is basically the same as other examples, except that: In this embodiment, see Figure 5-6 Both the radial magnetic ring 2 and the stator 3 have multiple rings distributed at intervals along the axial direction of the tube frame 1; the first axial magnetic ring 5 and the second axial magnetic ring 6 are alternately distributed within the tube frame 1. This allows for the series connection of multiple working groups to generate wind power, increasing both wind force and air volume. Simultaneously, it reduces the number of tube frames 1, first axial magnetic rings 5, and second axial magnetic rings 6, simplifying the structure and lowering costs. Furthermore, depending on wind power requirements, single or multiple groups can be selected for operation, allowing for flexible wind speed control and greater energy efficiency.

[0045] Example 3: This example is basically the same as other examples, except that: In this embodiment, see Figure 7-12 The tube frame 1 includes an outer cover tube 1-1 and an inner liner tube 1-2; the outer cover tube 1-1 has an air inlet 1-11, an assembly cavity 1-12 and an air outlet 1-13, and the first axial magnetic ring 5 and the second axial magnetic ring 6 are respectively locked at both ends in the assembly cavity 1-12. See Figure 10-12 The assembly cavity 1-12 has a first axial magnetic ring groove 1-121 and a second axial magnetic ring groove 1-122 at both ends.

[0046] See Figure 7-12 The inner liner 1-2 is located within the assembly cavity 1-12 and is sandwiched between the first axial magnetic ring 5 and the second axial magnetic ring 6; the radial magnetic ring 2 and the stator 3 are sandwiched between the outer wall of the inner liner 1-2 and the inner wall of the outer cover 1-1; the permanent magnet rotor 4 includes a first ring body 400, in which a permanent magnet 401 is embedded; there is an annular suspension gap K between the outer wall of the first ring body 400 and the inner wall of the inner liner 1-2; the inner wall of the inner liner 1-2 is provided with a limiting ring groove 1-22; a mating ring 4001 is provided on the outer wall of the first ring body 400, which is inserted into the limiting ring groove 1-22 without contact.

[0047] See Figure 7-12 Because the first axial magnetic ring 5 and the second axial magnetic ring 6 are respectively confined at both ends within the assembly cavity 1-12 of the outer casing 1-1, the first axial magnetic ring 5 and the second axial magnetic ring 6 will not shift axially or radially and will remain concentric. The inner liner 1-2 is located within the assembly cavity 1-12 and is sandwiched between the first axial magnetic ring 5 and the second axial magnetic ring 6. The inner liner 1-2 will not shift axially. The radial magnetic ring 2 and the stator 3 are sandwiched between the outer wall of the inner liner 1-2 and the outer casing 1-1. Between the inner walls of the frame 1, the radial magnetic ring 2 and the stator 3 are positioned relatively and fixed concentrically with the first axial magnetic ring 5 and the second axial magnetic ring 6. The permanent magnet rotor 4 includes a first ring body 400, in which a permanent magnet 401 is embedded and protected. The outer wall of the first ring body 400 is provided with a mating ring 4001, which is inserted into the limiting ring groove 1-22 without contact. The permanent magnet rotor 4 is stepped double-axial, which can reduce both the axial runout amplitude and the eccentric runout amplitude. In this way, the positions and states of the first axial magnetic ring 5, the second axial magnetic ring 6, the radial magnetic ring 2, the stator 3 and the permanent magnet rotor 4 in the frame 1 are stable, which can ensure the stability and reliability of long-term operation.

[0048] See Figure 7-12In this embodiment, the outer cover 1-1 includes two semi-outer cover cylinders (101, 102) that can be fixed together; specifically, the ends of the two semi-outer cover cylinders (101, 102) are threaded together and fixed, and the tightness is adjustable.

[0049] See Figure 7-12 The inner liner 1-2 includes an upper liner 201 and a lower liner 202 that can be nested together.

[0050] See Figure 7-12 In this embodiment, the upper liner 201 has a first sleeve 2011 and a first outer protruding ring 2012, the first outer protruding ring 2012 being disposed at the upper end of the first sleeve 2011; the lower liner 202 has a second sleeve 2021, a second outer protruding ring 2022, and a second inner protruding ring 2023; the second inner protruding ring 2023 is disposed in the middle of the second sleeve 2021, and the second outer protruding ring 2022 is disposed at the lower end of the second sleeve 2021; the second sleeve The body 2021 is fitted onto the first body 2011, and the upper surface of the second body 2021 abuts against the lower side of the first outer convex ring 2012; an outer retaining ring groove 1-21 is formed between the lower side of the first outer convex ring 2012 and the upper side of the second outer convex ring 2022; the radial magnetic ring 2 and the stator 3 are clamped in the outer retaining ring groove 1-21 and cannot be axially displaced; the limiting ring groove 1-22 is formed between the lower surface of the first body 2011 and the upper side of the second inner convex ring 2023. When the two semi-outer sleeves 101 are fixed together, the upper sleeve 201 and the lower sleeve 202 will slide axially and fit together. The upper end face of the second sleeve 2021 abuts against the lower side of the first outer convex ring 2012. At this time, the radial magnetic ring 2 and the stator 3 are clamped in the outer retaining ring groove 1-21 and cannot be axially displaced. The mating ring 4001 of the first ring body 400 is inserted between the lower end face of the first sleeve 2011 and the upper side of the second inner convex ring 2023 to form the limiting ring groove 1-22.

[0051] See Figure 7-12During assembly, the permanent magnet rotor 4, radial magnetic ring 2, and stator are placed between the upper bushing 201 and the lower bushing 202, and then axially slidably connected by the upper bushing 201 and the lower bushing 202. When the upper end face of the second sleeve 2021 abuts against the lower side of the first outer convex ring 2012, the mating ring 4001 of the first ring body 400 is inserted between the lower end face of the first sleeve 2011 and the upper side of the second inner convex ring 2023 to form the limiting ring groove 1-22 for limiting. At the same time, the radial magnetic ring 2 and the stator 3 are clamped in the outer clamping ring groove 1-21 and cannot be axially displaced. Then the first axial magnetic ring 2 is inserted into the lower end face of the first sleeve 2011 and the lower end face of the second inner convex ring 2023 to form the limiting ring groove 1-22 for limiting. The force ring 5 and the second axial magnetic ring 6 are respectively inserted into the two semi-outer casings (101, 102). Then the two semi-outer casings (101, 102) are connected and fixed together. At this time, the upper liner 201 and the lower liner 202 are axially clamped by the two semi-outer casings (101, 102). The upper liner 201 and the lower liner 202 no longer slide axially. At this time, the first axial magnetic ring 5, the second axial magnetic ring 6, the radial magnetic ring 2, the stator 3 and the permanent magnet rotor 4 in the cylinder frame 1 are quickly assembled. It has the advantages of simple assembly, ingenious structure, not easy to loosen, and long-term reliable and stable performance.

[0052] Example 4: This example is basically the same as other examples, except that: In this embodiment, see Figure 13 Each blade 4-2 has its tip extending to the center and connected as a single unit. Because it is connected as a single unit without any free ends, wind vibration is reduced and strength is increased.

[0053] Example 5: The present invention also discloses a device having a shaftless magnetic levitation fan as described in any of the above examples.

[0054] Specifically, the device can be any one of the following: fan, aircraft, vacuum cleaner, drone, air conditioner or robot vacuum cleaner, hair dryer, exhaust fan, range hood, air purifier, underwater silent propeller, laptop cooling fan, mobile phone cooling fan, or desktop computer cooling fan. The shaftless magnetic levitation fan is configured or installed on it.

[0055] In this embodiment, see [link to relevant documentation]. Figure 14 The device may be a fan, which employs a shaftless magnetic levitation fan as described in Embodiment 4. Specifically, the outer casing 1-1 is fixedly connected to the arm or fan base 7.

[0056] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A shaftless magnetic levitation fan, characterized in that: It includes a cylinder frame (1), a radial magnetic ring (2), a stator (3), a permanent magnet rotor (4), a first axial magnetic ring (5), and a second axial magnetic ring (6); The permanent magnet rotor (4) is located inside the cylindrical frame (1), and there is an annular suspension gap (K) between the permanent magnet rotor (4) and the cylindrical frame (1); the radial magnetic ring (2) and the stator (3) are fixed on the cylindrical frame (1), and the radial magnetic ring (2) is used to generate radial magnetic force on the circumference of the permanent magnet rotor (4) and make it magnetically levitate inside the cylindrical frame (1) and keep it concentric, and the stator (3) is used to drive the permanent magnet rotor (4) to rotate; the first axial magnetic ring (5) and the second axial magnetic ring (6) Fixed on the cylinder frame (1) and located on both sides of the permanent magnet rotor (4) axially; the first axial magnetic ring (5) repels the permanent magnet rotor (4) and has a first axial suspension gap (M-1), the second axial magnetic ring (6) repels the permanent magnet rotor (4) and has a second axial suspension gap (M-2); the permanent magnet rotor (4) is provided with a wind hole (4-1) at the center, and the inner wall of the wind hole (4-1) has blades (4-2) or other structures that can generate wind when rotating; The cylinder frame (1) includes an outer cover cylinder (1-1) and an inner liner cylinder (1-2); the outer cover cylinder (1-1) has an air inlet (1-11), an assembly cavity (1-12), and an air outlet (1-13), and the first axial magnetic ring (5) and the second axial magnetic ring (6) are respectively clamped at both ends inside the assembly cavity (1-12); the inner liner cylinder (1-2) is located inside the assembly cavity (1-12) and is clamped between the first axial magnetic ring (5) and the second axial magnetic ring (6); the radial magnetic ring (2) and the stator (3) are clamped in the inner liner cylinder. (1-2) Between the outer wall and the inner wall of the outer casing (1-1); the permanent magnet rotor (4) includes a first ring body (400), in which a permanent magnet (401) is embedded; there is an annular suspension gap (K) between the outer wall of the first ring body (400) and the inner wall of the inner liner (1-2); the inner wall of the inner liner (1-2) is provided with a limiting ring groove (1-22); a mating ring (4001) is provided on the outer wall of the first ring body (400), which is inserted into the limiting ring groove (1-22) without contact; The outer casing (1-1) includes two semi-outer casings (101, 102) that can be fixed together; the inner liner (1-2) includes an upper liner (201) and a lower liner (202) that can be nested together; the upper liner (201) has a first sleeve (2011) and a first outer protruding ring (2012), the first outer protruding ring (2012) being disposed at the upper end of the first sleeve (2011); the lower liner (202) has a second sleeve (2021), a second outer protruding ring (2022), and a second inner protruding ring (2023); the second inner protruding ring (2023) is disposed in the middle of the second sleeve (2021), the second inner protruding ring (2023) being ... Two outer convex rings (2022) are disposed at the lower end of the second sleeve (2021); the second sleeve (2021) is sleeved on the first sleeve (2011), and the upper end face of the second sleeve (2021) abuts against the lower side face of the first outer convex ring (2012); an outer retaining ring groove (1-21) is formed between the lower side face of the first outer convex ring (2012) and the upper side face of the second outer convex ring (2022); the radial magnetic ring (2) and the stator (3) are clamped in the outer retaining ring groove (1-21) and cannot be axially displaced; the limiting ring groove (1-22) is formed between the lower end face of the first sleeve (2011) and the upper side face of the second inner convex ring (2023).

2. The shaftless magnetic levitation fan as described in claim 1, characterized in that: The first axial magnetic ring (5) and / or the second axial magnetic ring (6) are axial magnetic coils; When the rotational speed of the permanent magnet rotor (4) changes during operation, the axial magnetic force generated by the first axial magnetic ring (5) and / or the second axial magnetic ring (6) also changes accordingly, so that the size of the first axial suspension gap (M-1) and the second axial suspension gap (M-2) remains unchanged.

3. The shaftless magnetic levitation fan as described in claim 1, characterized in that: The blades (4-2) are multiple and evenly distributed circumferentially.

4. A shaftless magnetic levitation fan as described in claim 3, characterized in that: The tips of each blade (4-2) extend to the center and are connected as one.

5. A shaftless magnetic levitation fan as described in any one of claims 1-4, characterized in that: Both the radial magnetic ring (2) and the stator (3) have multiple rings that are distributed at intervals along the axial direction of the cylinder frame (1); the first axial magnetic ring (5) and the second axial magnetic ring (6) are alternately distributed within the cylinder frame (1).

6. A device, characterized in that: A shaftless magnetic levitation fan having any one of claims 1-5.

7. The device as described in claim 6, characterized in that: The device may be any one of the following: fan, aircraft, vacuum cleaner, drone, air conditioner or robot vacuum cleaner, hair dryer, exhaust fan, range hood, air purifier, underwater silent propeller, laptop cooling fan, mobile phone cooling fan or desktop computer cooling fan.

8. A control method for controlling a shaftless magnetic levitation fan as described in any one of claims 1-5, characterized in that: (a) Initially, the permanent magnet rotor (4) is concentric with the radial magnetic ring (2), and the annular suspension gap (K) between the permanent magnet rotor (4) and the cylinder (1) is uniform in the circumferential direction; The first axial suspension gap (M-1) between the first axial magnetic ring (5) and the permanent magnet rotor (4) and the second axial suspension gap (M-2) between the second axial magnetic ring (6) and the permanent magnet rotor (4) are equal; The sum of the force vectors between the first axial magnetic force (F1) generated between the first axial magnetic ring (5) and the permanent magnet rotor (4) and the second axial magnetic force (F2) generated between the second axial magnetic ring (6) and the second axial suspension gap (M-2) between the permanent magnet rotor (4) is zero; (b) During operation, the permanent magnet rotor (4) performs a suspended rotational motion, and the blade (4-2) generates axial wind in the wind hole (4-1) as the permanent magnet rotor (4) moves; at this time, the permanent magnet rotor (4) is subjected to a recoil force (F3) opposite to the wind direction; then, by adjusting the size of the first axial magnetic ring (5) and / or the second axial magnetic ring (6), the sum of the force vectors among the first axial magnetic force (F1), the second axial magnetic force (F2) and the recoil force (F3) is zero.

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