A magnetic levitation motor

Abstract

The present invention relates to the technical field of magnetic levitation motors, and in particular to a magnetic levitation motor comprising a motor housing, a stator, a rotor, and a displacement sensor. The motor housing is a closed chamber, and the stator is disposed within the closed chamber. The stator comprises a first magnetic yoke, a coil, and a second magnetic yoke, one end of which is connected to the second magnetic yoke. A groove is formed inwardly at the center of one end of the motor housing, and the rotor is rotatably disposed in the groove in a suspended manner, without contacting the bottom or sides of the groove. The outer side of the groove protrudes outward to form a boss. The bent portion of the first magnetic yoke and the displacement sensor are disposed within the boss. There are multiple bosses, and the bosses are spaced apart. A gap is formed between the inner sidewall of the boss and the outer sidewall of the rotor, and the gap is connected to the exterior of the motor through the gap. The present invention improves the motor housing structure and adds an upper housing to provide a connecting channel between the motor rotor and the boss, thereby interconnecting the interior of the motor's operating portion with the surrounding area.

Description

Technical Field

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

[0002] In the biopharmaceutical field, especially in the mixing and processing of biological cell culture fluids, the performance of the stirring device directly affects the consistency of the cell growth environment and the culture efficiency. Traditional stirring technology has developed to the point where a magnetically levitated bearingless motor drives the stirring impeller to achieve contactless and frictionless stirring, thereby reducing mechanical wear and lowering the risk of contamination. Currently, such agitators on the market typically include a stirring tank with a cylindrical groove at the bottom. The groove houses a stirring impeller embedded with a permanent magnet, while the corresponding magnetically levitated bearingless motor is embedded in a corresponding boss on the outside of the stirring tank, driving the impeller to rotate through the action of the magnetic field force.

[0003] While this magnetic levitation stirring technology offers significant advantages over traditional mechanical stirring, a key issue has been identified in practical applications. Due to limitations in existing motor structures and the design of the stirring tank, a hard-to-reach dead zone forms in the grooved area at the bottom of the tank. This area creates poor mixing of the culture medium, potentially leading to localized nutrient imbalances and accumulation of metabolic waste during cell culture. This not only affects the overall quality of the culture medium and the progress of the reaction, but also limits the precise control and optimization of biopharmaceutical processes.

[0004] The parent case of this case is a dead zone-free agitator, the application date is July 8, 2024, and the application number is 202410903066.5. Summary of the Invention

[0005] The present invention aims to solve the above problems and provides a magnetic levitation motor, which adopts the following technical solutions:

[0006] A magnetic levitation motor includes a motor housing, a stator, a rotor and a displacement sensor. The motor housing is a closed chamber, and the stator is arranged in the closed chamber. The stator includes a first magnetic yoke, a coil and a second magnetic yoke. The first magnetic yoke includes a main body arranged along the axial direction of the motor and a bent portion arranged along the radial direction of the motor. The free end of the first magnetic yoke main body is connected to the second magnetic yoke. The motor housing is recessed inwardly near the center of one end of the bent portion of the first magnetic yoke to form a groove. The rotor is suspended and rotatably arranged in the groove, and the rotor does not contact the bottom or side of the groove. The outer side of the groove protrudes outward along the axis of the motor to form a boss. The bent portion of the first magnetic yoke and the displacement sensor are arranged in the boss. There are multiple bosses, and intervals are set between the bosses. A gap is formed between the inner side wall of the boss and the outer side wall of the rotor. The gap is connected to the outside of the motor through the interval.

[0007] Based on the above solution, the number of the bent portions of the first magnetic yoke accommodated in each boss is multiple.

[0008] On the basis of the above solution, two bent portions of the first magnetic yokes are disposed in each boss, and the displacement sensor is disposed between the two first magnetic yokes in each boss.

[0009] Preferably, the number of the first magnetic yoke accommodated in each boss is one.

[0010] Preferably, the bosses are evenly distributed along the circumference of the motor, and the intervals between adjacent bosses are the same.

[0011] Preferably, there are multiple first magnetic yokes, which are evenly distributed circumferentially in the lower shell. The lower shell also includes a yoke pressing plate, which is fixedly installed on the inner side of the lower shell, and the first magnetic yoke is clamped on the yoke pressing plate.

[0012] Based on the above solution, the upper edge of the yoke pressing plate is not higher than the upper edge of the lower shell.

[0013] Preferably, the rotor protrudes outwards toward one side of the bottom of the groove to form back blades, and grooves are formed between adjacent back blades.

[0014] Preferably, the coil includes a suspension winding and a drive winding, or the coil is a suspension-drive integrated winding.

[0015] Preferably, the rotor comprises a core and a rotor shell wrapping the core, and the core is made of permanent magnet or soft magnetic material.

[0016] The beneficial effects of the present invention are as follows: by improving the motor housing structure, adding an upper shell, and providing a communicating channel between the motor rotor and the boss, the interior of the motor's operating part and the surrounding area are communicated with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 : Schematic diagram of the appearance structure of the present invention;

[0018] Figure 2 : Structural cross-sectional view of the present invention;

[0019] Figure 3 : Schematic diagram of the structure when the number of bosses of the present invention is 3;

[0020] Figure 4 : Schematic diagram of the liquid flow path during the rotation of the rotor of the present invention;

[0021] Figure 5 : Schematic diagram of the liquid flow path around the boss during the rotation of the rotor of the present invention;

[0022] Figure 6 : Schematic diagram of the flow path of the peripheral liquid to the outside during the rotation of the rotor of the present invention;

[0023] Figure 7 : Schematic diagram of the back blade structure of the present invention;

[0024] Figure 8 : Schematic diagram of the second structure of the back blade of the present invention;

[0025] Figure 9 : Schematic diagram of the structure of embodiment 6 of the present invention;

[0026] Figure 10 : Schematic diagram of the assembly structure when the present invention is installed in a stirring tank;

[0027] Figure 11 : A cross-sectional view of the assembly position of the present invention when installed in a mixing tank;

[0028] Figure 12 : Figure 10 Schematic diagram of the card slot structure of the middle mixing tank. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings and examples:

[0030] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] In the description of the present invention, it should be understood that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship 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 cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] like Figures 1 to 6 As shown, a magnetic levitation motor includes a motor housing, a stator, a rotor, and a displacement sensor. The motor housing is a closed chamber. Specifically, the motor housing includes a lower housing 11 and an upper housing 12, which together form a closed chamber. The stator is disposed within the closed chamber and includes a first magnetic yoke 21, a coil 23, and a second magnetic yoke 24. The first magnetic yoke 21 includes a main portion arranged axially along the motor and a bent portion arranged radially along the motor. The free end of the main portion of the first magnetic yoke 21 is connected to the second magnetic yoke 24, which is annular and mounted on the side of the lower housing 11 away from the upper housing 12. There are multiple first magnetic yokes 21, evenly distributed along the circumference of the lower housing 11. The coil 23 is wound around the center of the first magnetic yoke 21, located between the connecting end and the bent portion of the first and second magnetic yokes 21 and 24. The coil 23 includes a suspension winding and a drive winding, or is an integrated suspension and drive winding, used to drive the rotor to levitate and rotate relative to the stator.

[0034] A groove is provided in the motor housing near the center of one end of the bent portion of the first magnetic yoke 21, and the rotor is rotatably arranged in the groove in a suspended manner, and the rotor does not contact the bottom or side of the groove. The rotor includes a core 31 and a rotor shell 32 that wraps the core 31, and the core 31 is made of a permanent magnet or a soft magnetic material. The outer side of the groove protrudes outward along the motor axis to form a boss 13, and the bent portion of the first magnetic yoke 21 and the displacement sensor are arranged in the boss 13. Specifically, the groove and the boss 13 are arranged on the upper shell 12. There are multiple bosses 13, and intervals 15 are provided between the bosses 13. A gap 14 is formed between the inner wall of the boss 13 and the outer wall of the rotor, and the gap 14 is connected to the outside of the motor through the interval 15. This ensures that the motor housing and the various regions of the rotor are connected to each other, and completely avoids the existence of a stirring dead zone. The side of the rotor away from the motor housing can be connected to a mechanism for expanding the stirring range, such as a stirring blade 43. The motor drives the rotor to suspend and rotate, thereby driving the stirring blade 43 to rotate continuously and periodically sweep over the gap 15 to achieve a stirring effect, ensuring that the liquid circulates and rotates continuously during the stirring process, effectively avoiding the problem of uneven stirring caused by a stirring dead zone. Specifically, Figures 4 to 6 As shown, the liquid below the stirring blade 43 rotates and flows out from the gap 15 through the gap 14 under the action of centrifugal force to mix with the external liquid; the stirring blade 43 periodically sweeps over the gap 15, thereby strengthening the mixing of the liquid at the gap 15 and the liquid outside the stirrer. Through the above structure and action, the mixing and convection of the liquid below the stirring blade 43 and the external liquid are strengthened, thereby avoiding the formation of a flow dead zone below the stirring blade 43 and causing adverse effects such as particle accumulation.

[0035] Each boss 13 houses multiple first magnetic yokes 21. Preferably, each boss 13 houses two bent portions of the first magnetic yokes 21, and the displacement sensor is disposed between the two first magnetic yokes 21 within each boss 13. For example, if there are eight first magnetic yokes 21, the number of bosses 13 is correspondingly set to four. Preferably, the multiple bosses 13 are evenly distributed along the circumference of the motor, and the spacing between adjacent bosses 13 is uniform.

[0036] To position and secure the first magnetic yoke 21, a yoke pressing plate 22 is further included. The yoke pressing plate 22 is fixedly mounted on the inner side of the lower housing 11. The first magnetic yoke 21 is clamped onto the yoke pressing plate 22 to ensure the circularity of the first magnetic yoke 21. Preferably, the upper edge of the yoke pressing plate 22 is no higher than the upper edge of the lower housing 11.

[0037] Preferably, if Figure 7 and Figure 8As shown, the rotor protrudes outward toward the bottom of the groove to form a back blade 33, and grooves are formed between adjacent back blades 33. The back blades 33 stir the liquid between the rotor and the bottom of the groove, forming turbulence inside and near the groove, thereby enhancing the flow of the liquid. The shapes of the back blades 33 and the grooves are various, such as Figure 10 As shown, the back blade 33 is approximately rectangular, and the groove shape is fan-shaped, as shown in FIG. Figure 11 As shown, the back blade 33 is fan-shaped and the groove shape is approximately rectangular. In addition, the area ratio of the back blade 33 and the groove can be adjusted according to actual needs.

[0038] Example 2

[0039] This embodiment is based on embodiment 1. Figures 10 to 12 As shown, the magnetic levitation motor is assembled on the stirring tank 41, and the stirring tank 41 is provided with a groove 42 protruding from the inner side of the stirring tank 41 at the assembly position. The groove 42 is arranged corresponding to the shape of the boss 13. The boss 13 is engaged with the groove 42 and is placed on the outer side of the stirring tank 41, so that the motor and the stirring tank 41 are closely fitted. The rotor is arranged in the accommodating cavity between the grooves 42 inside the stirring tank 41. There is a gap between the rotor and the grooves 42, and it does not contact the bottom of the accommodating cavity. An interval is set between the grooves 42 to ensure that the various areas at the assembly position of the stirring tank 41 are connected to each other, completely avoiding the existence of a stirring dead zone. The stirring blade 43 is fixedly connected to the rotor housing 32 by welding, bonding or integral molding, and is arranged toward the inner side of the stirring tank 41. The rotor housing 32 can be made of materials such as PC, PP, PA, PFA, PTFE or TPU. The rotor is driven to suspend and rotate by the motor, thereby driving the stirring blade 43 to rotate continuously to achieve a stirring effect. The inside and outside of the slot 42 are interconnected, ensuring that the liquid circulates and rotates continuously during the stirring process, effectively avoiding the problem of uneven stirring caused by a dead zone in the stirring.

[0040] Example 3

[0041] The difference between this embodiment and embodiment 1 is that the number of the first magnetic yokes 21 can be 6, 12, 24, etc., which can be selected according to the actual motor performance requirements, and the number of the corresponding bosses 13 can be 3, 6, 12, etc. Figure 3 shown.

[0042] Example 4

[0043] This embodiment differs from Example 1 in that each boss 13 houses only one first magnetic yoke 21, thereby forming a greater number of gaps 15 and, consequently, more liquid flow paths. The displacement sensors are arranged in pairs and evenly spaced circumferentially, with each displacement sensor and adjacent first magnetic yoke 21 encased within the same boss 13.

[0044] Example 5

[0045] The difference between this embodiment and the third embodiment is that each displacement sensor is disposed in its own boss 13 , and a gap 15 exists between the boss 13 enclosing the displacement sensor and the adjacent boss 13 enclosing the first magnetic yoke 21 .

[0046] Example 6

[0047] like Figure 1 and Figure 12 As shown, the difference between this embodiment and the above embodiment is that the shape of the interval 15 between adjacent bosses 13 can be fan-shaped, rectangular or other shapes.

[0048] The present invention has been described above by way of examples, but the present invention is not limited to the above specific embodiments. Any changes or modifications based on the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A magnetic levitation motor, characterized in that: The invention comprises a motor housing, a stator, a rotor and a displacement sensor, wherein the motor housing is a closed chamber, the stator is arranged in the closed chamber, the stator comprises a first magnetic yoke (21), a coil (23) and a second magnetic yoke (24), the first magnetic yoke (21) comprises a main body arranged along the motor axial direction and a bent portion arranged along the motor radial direction, the free end of the main body of the first magnetic yoke (21) is connected to the second magnetic yoke (24), the motor housing is provided with a groove near the center of one end of the bent portion of the first magnetic yoke (21), the rotor comprises a core (31) and a rotor shell (32) wrapping the core (31) ), the core (31) is made of a permanent magnet or a soft magnetic material, the rotor is suspended and rotatably arranged in the groove, and the rotor does not contact the bottom or side of the groove, the outer side of the groove protrudes outward along the motor axis direction to form a boss (13), the bent portion of the first magnetic yoke (21) and the displacement sensor are arranged in the boss (13), the number of the bosses (13) is multiple, and intervals (15) are set between the bosses (13), a gap (14) is formed between the inner side wall of the boss (13) and the outer side wall of the rotor, and the gap (14) is connected to the outside of the motor through the interval (15); There are multiple first magnetic yokes (21) which are evenly distributed in the circumferential direction in the lower housing (11); and a yoke pressing plate (22) is further included. The yoke pressing plate (22) is fixedly mounted on the inner side of the lower housing (11), and the first magnetic yoke (21) is clamped on the yoke pressing plate (22).

2. A magnetic levitation motor according to claim 1, characterized in that: The number of bent portions of the first magnetic yoke (21) accommodated in each boss (13) is multiple.

3. The magnetic levitation motor according to claim 2, characterized in that: Each boss (13) contains two bent portions of the first magnetic yokes (21), and the displacement sensor is arranged between the two first magnetic yokes (21) in each boss (13).

4. The magnetic levitation motor according to claim 1, characterized in that: The number of the first magnetic yoke (21) accommodated in each boss (13) is one.

5. The magnetic levitation motor according to claim 1, characterized in that: The bosses (13) are evenly distributed along the circumference of the motor, and the intervals between adjacent bosses (13) are the same.

6. The magnetic levitation motor according to claim 1, characterized in that: The upper edge of the yoke pressing plate (22) is not higher than the upper edge of the lower shell (11).

7. The magnetic levitation motor according to claim 1, characterized in that: The rotor protrudes outwards toward one side of the bottom of the groove to form a back blade (33), and grooves are formed between adjacent back blades (33).

8. The magnetic levitation motor according to claim 1, characterized in that: The coil (23) includes a suspension winding and a drive winding, or the coil (23) is a suspension drive integrated winding.

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