Magnetic suspension motor and submerged stirrer

Abstract

The magnetic suspension motor comprises annular rotors and a stator assembly, the two annular rotors are coaxial and arranged in the vertical direction, the number of magnetic poles of the two annular rotors is the same, the arrangement directions of the magnetic poles of the two annular rotors are the same or opposite, and the relative positions of the two annular rotors are fixed; the two annular rotors are arranged on the outer side of the stator assembly in a sleeving mode, and the stator assembly drives the two annular rotors to suspend and rotate through magnetic force. The axial driving assembly can provide additional axial force for the rotating cylinder, and after the rotating cylinder axially deviates, the rotating cylinder is driven to return to the normal position; the stator assembly is isolated from the outside by the mounting cavity, and the annular rotor is isolated from the outside by the rotating cylinder, so that external media are prevented from being polluted, and the stator assembly and the annular rotor are also prevented from being corroded by the external media.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic suspension devices, in particular to a magnetic suspension motor and a submersible stirrer. Background Art

[0002] Due to usage requirements, the volume occupied by the magnetic suspension device in the existing agitator cannot be too large, so a thin-film magnetic suspension motor is usually used.

[0003] The existing thin-film magnetic suspension motor has a small output power due to its limited size. In addition, its ability to control the axial movement of the rotating cylinder is poor, and the rotating cylinder is prone to excessive displacement, which affects normal use.

[0004] The existing submersible agitator is of an integrated type and the position of the agitating blade cannot be changed, so it cannot adapt to containers of different depths.

[0005] Some submersible agitators with multiple groups of stirring blades have fixed speed ratios of different groups of stirring blades, and cannot change the speed ratio according to different stirring fluids, and cannot further improve the stirring effect. Summary of the invention

[0006] The present invention aims to solve the above problems and provides a magnetic levitation motor and a submersible agitator to solve the above technical problems.

[0007] A magnetic levitation motor comprises: an annular rotor, a rotating cylinder and a stator assembly, wherein the two annular rotors are coaxial and arranged in the up-and-down direction, the two annular rotors have the same number of magnetic poles, the two annular rotors are respectively fixedly connected to the rotating cylinder, the rotating cylinder and the two annular rotors are respectively sleeved on the outside of the stator assembly, and the stator assembly drives the two annular rotors to rotate by magnetic force.

[0008] Furthermore, the stator assembly includes a first magnetic yoke and a coil group, the coil group is fixedly mounted on the outside of the first magnetic yoke, and the first magnetic yoke is evenly arranged around the circumference.

[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 radially inside the annular rotor, and the coil assembly is sleeved outside the axial arm.

[0010] Furthermore, the coil group includes a suspension coil and a rotating coil, the suspension coil and the rotating coil 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 suspension coil and the rotating coil jointly drive the annular rotor to suspend.

[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 respectively located on the upper and lower sides of the second magnetic yoke, and the second magnetic yoke is annular.

[0013] Furthermore, the rotating cylinder is made of non-magnetic material, and the inner cavity of the rotating cylinder is connected vertically.

[0014] A submersible stirring device using the magnetic levitation motor also includes a motor housing, which is made of non-magnetic material. The stator assembly is located inside the motor housing and fixedly connected to the motor housing. Blades are formed on the outside of the rotating cylinder, and the rotating cylinder is mounted on the outside of the motor housing. Multiple motor housings are arranged in a straight line along the same axis, and the positions of the motor housings are fixed and detachable.

[0015] Furthermore, an annular boss is formed on the outer side of the motor housing, the annular boss is located below the rotating cylinder, and the annular boss is used to limit the axial displacement of the rotating cylinder; It also includes a first magnetic component and a second magnetic component, wherein the first magnetic component is fixedly connected to the annular boss, and the second magnetic component is fixedly connected to the rotating cylinder, and the first magnetic component drives the second magnetic component to move axially through magnetic force.

[0016] Furthermore, it also includes a connecting pipe, the connecting pipe and the motor housing are arranged in a straight line along the same axis, and two adjacent pipes are fixedly and detachably connected, and the pipe includes the motor housing and the connecting pipe; It also includes an end cover, the connecting pipe and the motor housing are connected vertically, and the end cover is detachably connected to the lower end of the lowest pipe.

[0017] The present invention has the following advantages: 1. The two radial arms correspond to one annular rotor respectively, which increases the total electromagnetic force on the annular rotor, thereby providing greater power to the main shaft under the condition of the same motor size, thereby increasing the speed of the blades; 2. The two radial arms apply electromagnetic force to the corresponding annular rotor respectively, so that the rotating cylinder has two magnetic supports, the offset is smaller, and the position of the rotating cylinder is more stable; 3. The second magnetic yoke is set to form two sets of independent magnetic circuits. Different coil groups can change the forces on the two annular rotors by passing currents of different magnitudes. When the rotating cylinder deflects with the radial axis, two forces of different magnitudes are applied to the two ends of the rotating cylinder, so that the rotating cylinder deflects in the opposite direction and recovers, thereby improving the stability of the rotating cylinder during rotation. 4. The axial drive assembly can give the rotating drum additional axial force, and drive the rotating drum to return to its normal position after the rotating drum is axially offset; 5. By using different numbers of tubes, the number and axial position of the rotating drum can be changed, so as to adjust according to the conditions of the container, thereby improving the adaptability of the submersible agitator to different containers; 6. Each rotating drum is driven by the stator assembly in the corresponding motor housing. The speed and direction of each rotating drum can be adjusted. The speed, speed ratio and direction of each rotating drum with blades can be adjusted according to the conditions of the fluid, thereby improving the stirring effect of different fluids. 7. Due to the use of magnetic suspension structure, the cleanliness is improved compared to the agitator with bearings, and the damage to cells is reduced when used as a biological agitator; 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 hiding in the agitator is reduced, and the difficulty of subsequent cleaning inside the agitator is effectively reduced; 9. The size, shape and number of blades of the rotating drum matched with the multiple motor housings connected in series can be different to improve the stirring effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0019] Figure 1 : Schematic diagram of the three-dimensional structure of the magnetic levitation device (without the second magnetic yoke); Figure 2 : Figure 1 Schematic diagram of the magnetic pole change of the rotating magnetic field; Figure 3 : Figure 1 Schematic diagram of the magnetic pole change of the suspension magnetic field; Figure 4 : Schematic diagram of the three-dimensional structure of the magnetic levitation device (with a second magnetic yoke); Figure 5 : Figure 4 Schematic diagram of the magnetic pole change of the rotating magnetic field; Figure 6 : Figure 4 Schematic diagram of the magnetic pole change of the suspension magnetic field; Figure 7 : Cross-sectional view of the submersible stirring device (without the second magnetic yoke); Figure 8 : Figure 7 A partial enlarged view of the middle A; Fig. 9: Schematic diagram of the three-dimensional structure of the submersible stirring device; Fig.10 : Cross-sectional view of the submersible stirring device (with a second magnetic yoke); Fig.11 : Fig.10 A partial enlarged view of point B in the middle. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and examples: Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention. Embodiment 1: like Figures 4 to 6 , Figures 9 to 11 As shown, a magnetic levitation motor includes: an annular rotor 4, a rotating cylinder 5 and a stator assembly. The two annular rotors 4 are coaxial and arranged in the up and down 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 respectively. The rotating cylinder 5 and the two annular rotors 4 are respectively mounted 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 the same direction.

[0023] Furthermore, the annular rotor 4 may be a whole annular magnet, or a plurality of magnets arranged in an annular shape.

[0024] Furthermore, the stator assembly includes a first magnetic yoke 1 and a coil group, the coil group is fixedly mounted on the outside of the first magnetic yoke 1, and the first magnetic yoke 1 is evenly arranged around the circumference.

[0025] 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 . The radial arm 12 protrudes outward and is located radially inside the annular rotor 4 . The coil assembly is sleeved outside the axial arm 11 .

[0026] Each coil group can include one or more coils: Optionally, one coil group includes one coil. In this case, one coil provides the annular rotor 4 with a rotating magnetic field and a suspension magnetic field. The structure with only one coil is simpler, but has higher requirements on the control system.

[0027] Optionally, the coil group includes a suspension coil 2 and a rotating coil 3, the suspension 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, and the suspension coil 2 and the rotating coil 3 jointly drive the annular rotor 4 to suspend. The structure of using two coils is complicated, but the control system requirements are relatively low.

[0028] Furthermore, it also includes a second yoke 9, the first yoke 1 passes through the second yoke 9 and is fixed to the second yoke 9, the two coil groups corresponding to each first yoke 1 are respectively located on the upper and lower sides of the second yoke 9, and the second yoke 9 is annular. The second yoke 9 plays the role of magnetic conduction for the corresponding first yoke 1.

[0029] Furthermore, a radial sensor and a controller are included, wherein 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. Different currents of the upper and lower suspension coils 2 are used to give different magnetic forces to the two annular rotors 4, so that the rotating cylinder 5 is deflected.

[0030] Furthermore, the rotating cylinder 5 is made of a non-magnetic material, so as to avoid the formation of an axial magnetic circuit between the two annular rotors 4 in the rotating cylinder 5 .

[0031] Furthermore, the inner cavity of the rotating cylinder 5 is connected vertically, and the rotating cylinder 5 is a cylinder with openings at both ends, so that the rotating cylinder 5 can be easily mounted on the outer side of the motor housing 6 .

[0032] Preferably, the annular rotor 4 is completely located inside the rotating drum 5, thereby preventing the annular rotor 4 from contacting the outside world and thereby preventing the annular rotor 4 from contaminating the outside medium. The rotating drum 5 can be made of a material with strong corrosion resistance, such as plastic, to prevent the annular rotor 4 from being corroded by the outside medium.

[0033] The suspension rotation principle of this embodiment is described by taking the stator assembly including 8 first magnetic yokes 1 and 16 coil groups, each first magnetic yoke 1 corresponds to two coil groups, and each annular rotor 4 has 2 magnetic poles as an example. It should be noted that this embodiment can adopt a combination of annular rotors 4 and first magnetic yokes 1 with multiple different numbers of magnetic poles.

[0034] like Figure 4 As shown, N and S in the figure represent the two magnetic poles of the annular rotor 4. The rotating coil 3 of the upper coil group generates magnetic flux potential. The two rotating main magnetic circuits 13 of the upper layer pass through the two first magnetic yokes 1 of the upper layer, the annular rotor 4 of the upper layer, and the second magnetic yoke 9 of the upper layer to complete the closure; the rotating coil 3 of the lower coil group generates magnetic flux potential at the same time. The principle is the same as that of the upper layer, and the rotating main magnetic circuit of the lower layer is not shown in the figure. Among them, Figure 4 The two rotating main magnetic circuits 13 in the middle and upper layers are represented by red dot-dashed lines and blue dot-dashed lines respectively, and the direction of the arrows is the direction of the magnetic field.

[0035] It should be noted that the upper and lower independent magnetic circuits include the superposition of two components of the rotating main magnetic circuit 13 generated by the rotating coil 3 and the suspension magnetic circuit generated by the suspension coil 2. Figure 4 The rotating main magnetic circuit 13 with an arrow in the middle is a magnetic circuit for rotating the ring rotor 4.

[0036] Now let the rotating coils 3 groups of two adjacent first magnetic yokes 1 pass the same-direction current to generate an N-pole magnetic field at a certain moment. Then the rotating coils 3 groups of the two radially symmetrical first magnetic yokes 1 should pass the opposite same-direction current to generate an S-pole magnetic field at the same moment. At this time, a pair of magnetic fields required for rotation is formed. Through the phase change of the current, the pair of magnetic fields can be rotated, thereby driving the annular rotor 4 to rotate. The rotating magnetic field and the position change of the annular rotor 4 are shown as follows: Figure 5 shown.

[0037] in, Figure 5 The upper and lower levels in the figure are both bird's-eye views. Figure 5 The “upper layer” here refers to the magnetic field of the upper radial arms 12 and the upper annular rotor 4, the “lower layer” refers to the magnetic field of the lower radial arms 12 and the lower annular rotor 4, the angle below refers to the rotation angle of the annular rotor 4, the magnetic field within 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.

[0038] For the radial active suspension of the annular rotor 4, it is necessary to generate a two-pair magnetic field by energizing the suspension coil 2 of the stator assembly, which is the existing technology in the field of magnetic suspension motors. The number of suspended magnetic pole pairs is equal to the number of rotating magnetic pole pairs ±1 pair, and the deviation correction of the annular rotor 4 is achieved by superimposing the suspension magnetic field on the rotating magnetic field.

[0039] The position changes of the suspension magnetic field and the annular rotor 4 are as follows: Figure 6 As shown. Among them, Figure 6 The upper and lower levels in the figure are both bird's-eye views. Figure 6 The "upper layer" refers to the magnetic field of the upper radial arms 12 and the upper annular rotor 4, the "lower layer" refers to the magnetic field of the lower radial arms 12 and the lower annular rotor 4, the angle below refers to the rotation angle of the annular rotor 4, the magnetic field in the inner circle is the suspension magnetic field of the stator assembly, and the magnetic field between the two circles is the corresponding magnetic field of the annular rotor 4.

[0040] Among them, except for the two radial degrees of freedom which are active suspension and axial rotation, the other degrees of freedom are passive suspension.

[0041] It should be noted that, since the polarities of the axial magnetic poles of the two annular rotors 4 are the same, the polarities of the two radial arms 12 of the same first magnetic yoke 1 are the same.

[0042] In this embodiment, the two coil groups can respectively generate different magnetic forces on the two annular rotors 4. Since the two annular rotors 4 are coaxially spaced and placed at both ends of the rotating cylinder 5, compared with the magnetic suspension sheet motor with only one permanent magnet rotor in the prior art, this structure can better suspend and rotate a relatively long shaft, and has a higher output power under the same volume.

[0043] In most motors, since only one end of the rotating cylinder 5 is connected to the load, the distances between the two annular rotors 4 and the force-bearing position of the rotating cylinder 5 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 deviation of the rotating cylinder 5.

[0044] However, when the radial external force on the rotating cylinder 5 is too large, external forces need to be applied at the upper and lower ends to suppress it, which requires different forces to be applied to the annular rotors 4 at both ends. The difference in the magnitude of the magnetic forces on the upper and lower annular rotors 4 can be achieved by changing the current of the upper and lower suspension coils 2.

[0045] Embodiment 2: like Figures 1 to 3 , Figures 7 to 9 As shown, a magnetic levitation motor includes: an annular rotor 4, a rotating cylinder 5 and a stator assembly. The two annular rotors 4 are coaxial and arranged in the up and down direction. The two annular rotors 4 have the same number of magnetic poles. The two annular rotors 4 are respectively fixedly connected to the rotating cylinder 5. The rotating cylinder 5 and the two annular rotors 4 are respectively mounted 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.

[0046] Furthermore, the annular rotor 4 may be a whole annular magnet, or a plurality of magnets arranged in an annular shape.

[0047] Furthermore, the stator assembly includes a first magnetic yoke 1 and a coil group, the coil group is fixedly mounted on the outside of the first magnetic yoke 1, and the first magnetic yoke 1 is evenly arranged around the circumference.

[0048] 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 . The radial arm 12 protrudes outward and is located radially inside the annular rotor 4 . The coil assembly is sleeved outside the axial arm 11 .

[0049] Each coil group can include one or more coils: Optionally, one coil group includes one coil. In this case, one coil provides the annular rotor 4 with a rotating magnetic field and a suspension magnetic field. The structure with only one coil is simpler, but has higher requirements on the control system.

[0050] Optionally, the coil group includes a suspension coil 2 and a rotating coil 3, the suspension 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, and the suspension coil 2 and the rotating coil 3 jointly drive the annular rotor 4 to suspend. The structure of using two coils is complicated, but the control system requirements are relatively low.

[0051] Furthermore, adjacent first magnetic yokes 1 are not connected by magnetic conductive materials, and 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 are connected by magnetic conductive materials, the magnetic circuit will be changed.

[0052] Furthermore, the rotating cylinder 5 is made of a non-magnetic material, so as to avoid the formation of an axial magnetic circuit between the two annular rotors 4 in the rotating cylinder 5 .

[0053] Furthermore, the inner cavity of the rotating cylinder 5 is connected vertically, and the rotating cylinder 5 is a cylinder with openings at both ends, so that the rotating cylinder 5 can be easily mounted on the outer side of the motor housing 6 .

[0054] Preferably, the annular rotor 4 is completely located inside the rotating drum 5, thereby preventing the annular rotor 4 from contacting the outside world and thereby preventing the annular rotor 4 from contaminating the outside medium. The rotating drum 5 can be made of a material with strong corrosion resistance, such as plastic, to prevent the annular rotor 4 from being corroded by the outside medium.

[0055] like Figures 1 to 3 As shown, the stator assembly includes 8 first magnetic yokes 1 and 8 coil groups, and each annular rotor 4 has 2 magnetic poles as an example to illustrate the suspension rotation principle of this embodiment. It should be noted that this embodiment can adopt a combination of annular rotors 4 and first magnetic yokes 1 with multiple different numbers of magnetic poles.

[0056] For rotation, similar to a permanent magnet synchronous motor, the stator is usually required to excite a rotating magnetic field with the same number of poles as the annular rotor 4. Since the present embodiment comprises two annular rotors 4 arranged in a straight axial direction, and the coaxial annular rotors 4 are not connected by magnetic conductive materials, the first magnetic yoke 1 is C-shaped and the two adjacent first magnetic yokes 1 are not connected by magnetic conductive materials, in order to realize the rotating magnetic field, the magnetic pole positions of the double-layer annular rotor 4 need to be staggered, that is, when the number of pole pairs of the annular rotor 4 is 1, the same magnetic poles of the double-layer annular rotor 4 are offset by 180°.

[0057] It should be noted that when the annular rotor 4 has M magnetic pole pairs, the same magnetic poles of the annular rotor 4 are offset by 180° / M.

[0058] Now let the rotating coils 3 groups of two adjacent first magnetic yokes 1 pass the same-direction current to generate an N-pole magnetic field at a certain moment. Then the rotating coils 3 groups of the two radially symmetrical first magnetic yokes 1 should pass the opposite same-direction current to generate an S-pole magnetic field at the same moment. At this time, a pair of magnetic fields required for rotation is formed. Through the phase change of the current, the pair of magnetic fields can be rotated, thereby driving the annular rotor 4 to rotate. The rotating magnetic field and the position change of the annular rotor 4 are shown as follows: Figure 2 shown.

[0059] in, Figure 2 The upper and lower levels in the figure are both bird's-eye views. Figure 2 The “upper layer” here 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 within 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.

[0060] like Figure 1 As shown, N and S in the figure represent the two magnetic poles of the annular rotor 4, the rotating coil 3 generates magnetic flux potential, 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. Figure 1 The two rotating main magnetic circuits 13 are represented by red dotted lines and blue dotted lines respectively, and the direction of the arrow is the direction of the magnetic field.

[0061] It should be noted that an independent magnetic circuit includes 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 . Figure 1 The rotating main magnetic circuit 13 with an arrow in the middle is a magnetic circuit for rotating the ring rotor 4.

[0062] For the radial active suspension of the annular rotor 4, it is necessary to generate a two-pair magnetic field by controlling the power supply of the suspension coil 2 of the stator, which is a prior art in the field of magnetic suspension motors. The number of suspended magnetic pole pairs is equal to the number of rotating magnetic pole pairs ±1 pair, and the deviation correction of the annular rotor 4 is achieved by superimposing the suspension magnetic field on the rotating magnetic field.

[0063] The suspension magnetic field change of the double-layer annular rotor 4 can be Figure 3 It is understood that except for the two radial degrees of freedom which are active suspension and axial rotation, the other degrees of freedom are passive suspension. Since the double-layer annular rotor 4 needs to participate simultaneously to form a rotating main magnetic circuit 13 when a specific stator needs to work, the magnitude of the corrective force received by the two annular rotors 4 will be the same regardless of whether they are actively or passively suspended.

[0064] in, Figure 3 The upper and lower levels in the figure are both bird's-eye views. Figure 3 The "upper layer" 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 within the circle is the suspension magnetic field of the stator assembly, and the magnetic field between the circles is the magnetic field of the corresponding annular rotor 4.

[0065] Since the two layers of annular rotors 4 are coaxially spaced at both ends of the rotating cylinder 5, compared with the magnetic levitation sheet motor with only one annular rotor 4 in the prior art, this structure can better suspend and rotate a relatively long shaft and output greater power.

[0066] Embodiment three: like Figures 1 to 11 As shown, a submersible stirring device using the magnetic levitation motor described in Example 1 or 2 also includes a motor housing 6, which is made of non-magnetic material. The stator assembly is located inside the motor housing 6 and fixedly connected to the motor housing 6. Blades 52 are formed on the outside of the rotating cylinder 5, and the rotating cylinder 5 is mounted on the outside of the motor housing 6. Multiple motor housings 6 are arranged in a straight line along the same axis. The motor housings 6 are fixed and detachable, and the motor housings 6 can be directly connected or indirectly connected through other connecting parts.

[0067] Furthermore, an annular boss 62 is formed on the outside of the motor housing 6, and 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. In order to prevent the rotating cylinder 5 from falling away from the outside of the motor housing 6 due to gravity, the annular boss 62 is used to stop the rotating cylinder 5 to prevent the rotating cylinder 5 from continuing to fall after contact.

[0068] Furthermore, it also includes a first magnetic component 10 and a second magnetic component 103, wherein 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, and the first magnetic component 10 drives the second magnetic component 103 to move axially through magnetic force.

[0069] Optionally, the first magnetic assembly 10 is a magnet, and the second magnetic assembly 103 is a magnet. At this time, the first magnetic assembly 10 and the second magnetic assembly 103 generate a repulsive force, thereby using magnetic force to overcome the gravity of the rotating cylinder 5 and make it levitate.

[0070] Optionally, the first magnetic assembly 10 includes a soft magnetic body 101 and an axial coil 102, wherein the axial coil 102 is wound around the outside of the soft magnetic body 101, and the second magnetic assembly 103 is a magnet. The axial coil 102 can change the direction of the magnetic force on the second magnetic assembly 103 by changing the direction of the current, thereby driving the rotating cylinder 5 to move axially upward or downward according to the position of the rotating cylinder 5; the axial coil 102 can change the magnitude of the magnetic force by changing the magnitude of the current, thereby accurately controlling the axial position of the rotating cylinder 5.

[0071] More preferably, an axial sensor and a controller are further included, wherein the axial sensor is used to detect the axial position of the rotating drum 5, and the controller is used to change the direction of the current in the axial coil 102. The axial position of the rotating drum 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 the energization.

[0072] Furthermore, it also includes a connecting pipe 7, which is arranged in a straight line with the motor housing 6 along the same axis, and two adjacent pipes are fixedly and detachably connected, and the pipe includes the motor housing 6 and the connecting pipe 7.

[0073] Several connecting tubes 7 may be located between the two motor housings 6 , and the axial distance between the two motor housings 6 and the rotating cylinder 5 outside thereof may be changed by the number of connecting tubes 7 .

[0074] The depth of the rotating drum 5 can also be changed by using a motor housing 6 without a rotating drum 5 on the outside, such as two motor housings 6 are directly fixedly connected, the upper motor housing 6 is not provided with a rotating drum 5 on the outside, and the lower motor housing 6 is provided with a rotating drum 5 on the outside, thus reducing the height of the rotating drum 5. In this case, the upper motor housing 6 is equivalent to the connecting tube 7 and does not need to be powered. In this way, the connecting tube 7 is not needed, and the number of required parts is reduced.

[0075] Furthermore, an end cap 63 is included. The connecting pipe 7 and the motor housing 6 are both connected vertically, and the connecting pipe 7 and the motor housing 6 are connected vertically to facilitate the wires to pass upward. The end cap 63 is detachably connected to the lower end of the lowermost pipe. The end cap 63 is used to block the inner cavity of the motor housing 6 or the connecting pipe 7, and plays a sealing role to prevent external fluid from entering the inner cavity of the motor housing 6 or the connecting pipe 7.

[0076] 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, and a barrel body 8, which is fixedly and detachably connected to the top plate 72. The top plate 72 is used as a connecting piece to connect the pipe fitting and the barrel body 8 so that the positions of the two are fixed.

[0077] Further, the motor housing 6 is formed with a first boss 61 at one end, and an internal thread is formed on the inner wall of the other end, and an external thread is formed on the outer wall of the first boss 61; the connecting pipe 7 is formed with a second boss 71 at one end, and an internal thread is formed on the inner wall of the other end, and an external thread is formed on the outer wall of the second boss 71; the end cover 63 is formed with an internal thread; the top plate 72 is formed with an external thread; the external thread and the internal thread are matched. The threads of the motor housing 6, the connecting pipe 7, and the end cover 63 are matched, so that the motor housing 6, the connecting pipe 7, and the end cover 63 can be threadedly connected to each other.

[0078] Furthermore, blades 52 are formed on the outer side of the rotating cylinder 5, and the blades 52 are used to stir the fluid.

[0079] Furthermore, the annular rotor 4 is completely located in the rotating cylinder 5 , that is, the rotating cylinder 5 wraps the annular rotor 4 , so as to prevent the annular rotor 4 from contacting with external fluid, preventing the annular rotor 4 from contaminating the fluid, and preventing the fluid from corroding the annular rotor 4 .

[0080] Furthermore, the rotating drum 5 and the motor housing 6 are made of non-magnetic conductive materials. The rotating drum 5, the motor housing 6, the end cover 63 and the connecting pipe 7 can be made of corrosion-resistant plastic.

[0081] Furthermore, the stator assembly includes a first magnetic yoke 1 and a coil, the magnetic yoke 1 is evenly arranged in a circumference, and the coil is sleeved on the outside of the first magnetic yoke 1 .

[0082] It should be noted that the submersible stirring device may include or exclude the barrel 8. When the barrel 8 is not included, the submersible stirring device is extended into a container filled with fluid and fixed to the container. When the barrel 8 is included, the fluid is directly added to the barrel 8.

[0083] During installation, the number of motor housings 6 and rotating drums 5 is changed according to the requirements of the stirring fluid and the container, and the spacing between the two rotating drums 5 is changed by changing the number of connecting pipes 7 between the two motor housings 6 or the number of motor housings 6 without rotating drums 5. By changing the number between the motor housing 6 and the top plate 72, the depth of the rotating drum 5 in the container is changed.

[0084] During operation, the stator assembly drives the annular rotor 4 to rotate, and then drives the blades 52 to rotate to stir the fluid. The rotating cylinder 5 is suspended and does not contact the motor housing 6. The suspension force of the annular rotor 4 can be provided by the stator assembly and / or the first magnetic assembly 10.

[0085] Since each rotating drum 5 is driven by the stator assembly in the corresponding motor housing 6, the rotation speed of each rotating drum 5 can be adjusted so that the rotating drum 5 generates a required differential speed to improve the stirring effect on a specific fluid.

[0086] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications made based on the present invention belong to the scope of protection claimed by the present invention.

Claims

1. A magnetic levitation motor, characterized in that: include: An annular rotor (4), a rotating cylinder (5) and a stator assembly, wherein the two annular rotors (4) are coaxial and arranged in the up-and-down direction, the two annular rotors (4) have the same number of magnetic poles, the two annular rotors (4) are respectively fixedly connected to the rotating cylinder (5), the rotating cylinder (5) and the two annular rotors (4) are respectively sleeved on the outside of the stator assembly, and the stator assembly drives the two annular rotors (4) to rotate by magnetic force.

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

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

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

5. The 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. The 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 respectively located on the upper and lower sides of the second magnetic yoke (9), and the second magnetic yoke (9) is annular; It also includes a radial sensor and a controller, wherein the radial sensor is used to detect the radial position of the rotating drum (5), and the controller is used to change the current in the coil group.

7. The magnetic levitation motor according to claim 1, characterized in that: The rotating cylinder (5) is made of a non-magnetic material, and the inner cavity of the rotating cylinder (5) is connected vertically.

8. A submersible stirring device using the magnetic levitation motor according to any one of claims 1 to 7, characterized in that: It also includes a motor housing (6), the motor housing (6) being made of a non-magnetic material, the stator assembly being located inside the motor housing (6) and fixedly connected to the motor housing (6), blades (52) being formed on the outside of the rotating cylinder (5), the rotating cylinder (5) being sleeved on the outside of the motor housing (6), a plurality of motor housings (6) being arranged in a straight line along the same axis, and the motor housings (6) being fixed in position and removable.

9. A submersible stirring device according to claim 8, characterized in that: An annular boss (62) is formed on the outside of the motor housing (6), the annular boss (62) is located below the rotating cylinder (5), and the annular boss (62) is used to limit the axial displacement of the rotating cylinder (5); It also comprises a first magnetic component (10) and a second magnetic component (103), wherein 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), and the first magnetic component (10) drives the second magnetic component (103) to move axially through magnetic force.

10. The submersible stirring device according to claim 8, characterized in that: It also includes a connecting pipe (7), wherein the connecting pipe (7) and the motor housing (6) are arranged in a straight line along the same axis, and two adjacent pipes are fixedly and detachably connected, and the pipe includes the motor housing (6) and the connecting pipe (7); It also includes an end cover (63), the connecting pipe (7) and the motor housing (6) are connected vertically, and the end cover (63) is detachably connected to the lower end of the lowermost pipe.

Images