A magnetic suspension shaftless motor stator and a magnetic suspension shaftless pump

Abstract

The application discloses a magnetic suspension shaftless motor stator and a magnetic suspension shaftless pump, and belongs to the technical field of magnetic suspension shaftless motor stators and pumps. The magnetic suspension shaftless motor stator comprises segmented stator units, each of which is provided with opposite outer ends and inner ends; the outer ends of the segmented stator units are provided with a plurality of stator poles which are arranged in a whole fan shape; the inner ends of the segmented stator units are extended with central coupling magnetic bridges; the outer end portions of the central coupling magnetic bridges are connected to the inner ends of adjacent segmented stator units; each of the stator poles is wound with a torque winding; and each of the central coupling magnetic bridges is wound with a suspension winding. The central coupling magnetic bridges isolate the suspension magnetic flux generated by the suspension windings from the torque magnetic flux generated by the torque windings in the magnetic circuit. Through the unique design of the internal central coupling magnetic bridges, the influence of local magnetic saturation on the suspension control precision is avoided, the decoupling algorithm of the control system is simplified, and the stability of the suspension operation is improved.

Description

Technical Field

[0001] This invention relates to the field of motor stator technology, specifically to a magnetic levitation shaftless motor stator and a magnetic levitation shaftless pump. Background Technology

[0002] A magnetic levitation shaftless motor is an advanced drive device that combines magnetic levitation technology with motor technology. It achieves contactless rotor levitation and rotation by simultaneously controlling the motor torque magnetic field and the levitation magnetic field in a single motor stator. Its core advantage lies in achieving rotor levitation through magnetic force, eliminating mechanical contact and friction, thereby significantly improving the system's operating efficiency and lifespan. In addition, thanks to its shaftless design, the magnetic levitation shaftless motor does not require the lubrication and sealing system of traditional bearings, and is therefore widely used in fields such as clean pumps, high-speed centrifuges, and semiconductors.

[0003] However, the stator structure design of existing magnetic levitation motors has significant limitations. Traditional designs often integrate the levitation winding and torque winding in the same magnetic circuit or slot, resulting in severe magnetic field coupling between the two. This coupling not only increases the complexity of the control system but also limits the motor's power density and levitation stability. Furthermore, the levitation magnetic flux is prone to local flux density saturation, leading to saturation of the magnetic levitation force and affecting magnetic levitation stability. Summary of the Invention

[0004] The purpose of this invention is to provide a magnetic levitation shaftless motor stator and a magnetic levitation shaftless pump. Through a unique internal central coupling magnetic bridge design, the levitation magnetic circuit and the torque magnetic circuit are effectively isolated in physical space, avoiding the influence of local magnetic saturation on the levitation control accuracy, thereby simplifying the decoupling algorithm of the control system and improving the stability of levitation operation.

[0005] According to the present invention, a magnetic levitation shaftless motor stator includes: segmented stator units, each segmented stator unit having an opposite outer end and an inner end, the outer end of each segmented stator unit having a plurality of stator poles arranged in an integral fan shape, the inner end of each segmented stator unit having a central coupling magnetic bridge extending therefrom, the outer end of the central coupling magnetic bridge being connected to the inner end of an adjacent segmented stator unit, each stator pole having a torque winding wound around it, each central coupling magnetic bridge having a levitation winding wound around it, and the central coupling magnetic bridge isolating the levitation magnetic flux generated by the levitation winding from the torque magnetic flux generated by the torque winding in the magnetic circuit.

[0006] Furthermore, the number of segmented stator units is N, where N is an integer greater than or equal to 3.

[0007] Furthermore, the segmented stator unit and the central coupling magnetic bridge are connected by bolts, and the segmented stator unit and the central coupling magnetic bridge are respectively provided with positioning through holes for bolt connection.

[0008] Furthermore, each of the segmented stator units comprises multiple silicon steel sheets stacked together.

[0009] Furthermore, the levitation winding can be any one of two-phase, three-phase, or multi-phase coil structures.

[0010] Furthermore, the cross-sectional profile of the centrally coupled magnetic bridge can be any one of a rectangle, a trapezoid, or a tenon-and-mortise interlocking structure.

[0011] Furthermore, the segmented stator unit is integrally formed with the stator pole and the central coupling magnetic bridge.

[0012] The present invention also provides a magnetic levitation shaftless pump, including the magnetic levitation shaftless motor stator as described above, and a housing. The segmented iron core is installed inside the housing. The housing also houses a shaftless motor rotor coaxially sleeved around the segmented iron core and an impeller assembly installed outside the shaftless motor rotor. Gaps are provided between the segmented iron core and the shaftless motor rotor, and between the impeller assembly and the housing.

[0013] Furthermore, the outer casing is provided with a flow channel inlet and a flow channel outlet that communicate with the gap.

[0014] The beneficial effects of this invention are as follows: 1. This invention effectively isolates the levitation magnetic circuit from the torque magnetic circuit in physical space through a unique centrally coupled magnetic bridge design, avoiding the impact of local magnetic saturation on the levitation control accuracy, thereby simplifying the decoupling algorithm of the control system and improving the stability of levitation operation.

[0015] 2. Since the torque windings are distributed on independent outer stator poles, the outer circumferential space of the stator can be fully utilized to increase the slot fill factor of the torque windings, thereby increasing the torque density of the motor. At the same time, the centrally coupled magnetic bridge is dedicated to generating levitation force. The magnetic circuit is short and has little leakage flux, which can generate a large levitation force with a small excitation current, improving the efficiency of the levitation system. Finally, the annular magnetic circuit structure can disperse the levitation magnetic flux inside the stator and avoid levitation magnetic flux saturation.

[0016] 3. The segmented stator structure breaks the limitations of traditional whole-round lamination. During the silicon steel sheet stamping process, the segmented units can be closely arranged, which significantly reduces stamping waste, improves the material utilization rate of silicon steel sheets, and reduces production costs.

[0017] 4. Before assembly, the torque windings of each segmented stator unit and the levitation windings on the central coupling magnetic bridge can be automatically wound, avoiding the problems of limited space and difficult operation in traditional internal stator winding, and greatly improving production efficiency and winding consistency.

[0018] 5. By setting precise positioning through holes on the segmented stator unit and the central coupling magnetic bridge, and using the positioning holes for positioning and installation, the problem of concentricity is effectively solved. This ensures the mechanical precision of the stator after assembly and guarantees the uniformity of the air gap, which is especially important for magnetic levitation motors that are sensitive to the air gap. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the magnetic levitation shaftless pump described in this invention.

[0020] Figure 2 This is a schematic diagram of the stator of the magnetic levitation shaftless motor described in this invention.

[0021] Figure 3 This is a cross-sectional view of the magnetic levitation shaftless pump described in this invention.

[0022] In the figure, 1-segmented stator unit; 2-stator pole; 3-center coupling magnetic bridge; 4-torque winding; 5-levitation winding; 6-magnetic levitation shaftless pump; 7-outer shell; 701-top cover; 702-bottom shell; 8-shaftless motor rotor; 9-impeller assembly; 901-impeller shell; 902-impeller blade; 10-gap; 11-flow channel inlet; 12-flow channel outlet; 13-first cavity; 14-second cavity; 15-flow channel through hole. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0024] Combination Figures 1 to 3 This invention provides a stator for a magnetic levitation shaftless motor, comprising: a segmented stator core, the segmented core including multiple integrally formed segmented stator units 1, each segmented stator unit 1 having opposite outer and inner ends, the outer end of the segmented stator unit 1 having multiple stator poles 2 arranged in a fan shape, the inner end of the segmented stator unit 1 extending with a central coupling magnetic bridge 3, the outer end of the central coupling magnetic bridge 3 being connected to the inner end of adjacent fan-shaped segmented stator units 1, torque windings 4 wound on the multiple stator poles 2, and levitation windings 5 ​​wound between the multiple central coupling magnetic bridges 3, the central coupling magnetic bridges 3 isolating the levitation magnetic flux generated by the levitation windings 5 ​​from the torque magnetic flux generated by the torque windings 4 on the magnetic circuit.

[0025] This invention effectively isolates the levitation magnetic circuit and the torque magnetic circuit in physical space through a unique internal annular magnetic bridge design. The levitation magnetic flux is mainly closed within the central coupling magnetic bridge 3 and the inner side of the segmented stator unit 1, while the torque magnetic flux is mainly closed within the outer stator pole 2. This "internal levitation, external torque" topology greatly reduces the coupling and interference of the two magnetic fields in the stator core, avoids the impact of local magnetic saturation on the levitation control accuracy, thereby simplifying the decoupling algorithm of the control system and improving the stability of levitation operation.

[0026] Since the torque winding 4 is distributed on the independent outer stator pole 2, the outer circumferential space can be fully utilized to increase the slot fill factor of the torque winding 4, thereby increasing the torque density of the motor. At the same time, the central coupling magnetic bridge 3 is dedicated to generating levitation force. The magnetic circuit is short and the leakage magnetic field is small, which can generate a large levitation force with a small excitation current, improving the efficiency of the levitation system and avoiding levitation magnetic flux saturation.

[0027] The torque winding 4 and the suspension winding 5 can be wound automatically, avoiding the problems of limited space and difficult operation in traditional inner stator winding, and greatly improving production efficiency and winding consistency.

[0028] The number of segmented stator units 1 is N, where N is an integer greater than or equal to 3. The centrally coupled magnetic bridge 3, segmented stator units 1, and stator poles 2 are arranged in a radial structure.

[0029] The segmented stator unit 1 and the central coupling magnetic bridge 3 are connected by bolts.

[0030] The segmented stator unit 1 and the central coupling magnetic bridge 3 are respectively provided with positioning through holes for bolt connection.

[0031] By setting precise positioning through holes and using pin positioning, the problem of concentricity during the splicing of segmented structures is effectively solved. This ensures the mechanical precision of the stator after assembly and guarantees the uniformity of the air gap, which is especially important for magnetic levitation motors that are sensitive to air gaps.

[0032] Each segmented stator unit 1 is composed of multiple silicon steel sheets stacked together.

[0033] During the stamping process of silicon steel sheets, the segmented structure allows for close arrangement, which significantly reduces stamping waste, improves the material utilization rate of silicon steel sheets, and lowers production costs.

[0034] The levitation winding 5 can be any of two-phase, three-phase, or multi-phase coil structures.

[0035] The cross-sectional profile of the centrally coupled magnetic bridge 3 can be any one of a rectangle, a trapezoid, or a tenon-and-mortise interlocking structure.

[0036] The segmented stator unit 1 is integrally formed with the stator pole 2 and the central coupling magnetic bridge 3.

[0037] Technicians can match the number of coil turns and wire diameter according to the rotor suspension control degree of freedom and the target suspension stiffness; the cross-sectional profile of the central coupling magnetic bridge 3 can be rectangular or trapezoidal to increase the magnetic flux flow area, or a tenon and mortise interlocking structure can be selected, and adjacent central coupling magnetic bridges 3 can be interlocked with each other through the tenon and mortise structure to further improve the overall mechanical rigidity of the stator.

[0038] During the processing stage, the segmented stator unit 1 is independently stamped and formed, and multiple pieces can be arranged in a staggered and tight pattern on the sheet metal, reducing silicon steel scrap and improving material utilization. During the winding stage, each segmented stator unit 1 is not yet assembled into a whole and can be transported separately to the automated winding equipment to complete the winding of the torque winding 4 on the stator pole 2 and the suspension winding 5 on the center coupling magnetic bridge 3, respectively. The winding operation space is sufficient, the coils are arranged tightly, the slot fill factor is higher, and the automated processing ensures that the parameters of each stator winding are uniform, resulting in strong stability in batch production.

[0039] During operation, the torque flux generated by the torque winding 4 is closed only between the outer stator pole 2 and the outer rotor of the segmented stator unit 1, while the suspension flux generated by the suspension winding 5 is closed only between the central coupling magnetic bridge 3 and the inner section of the segmented stator unit 1. The two sets of flux flow paths are completely separated, and the coupling interference is minimal. The central coupling magnetic bridge 3 can realize bidirectional shunting of the suspension flux, avoiding magnetic saturation caused by excessive local magnetic flux density. Under the same excitation current, the output suspension magnetic force is greater and the suspension stiffness is more stable, simplifying the decoupling algorithm of the electronic control system and improving the operating stability of the motor under high speed and variable load conditions.

[0040] The segmented stator unit 1, outer stator pole 2, and central coupling magnetic bridge 3 are integrally stamped structures with no splicing gaps, resulting in lower magnetic resistance. Each segmented stator unit 1 is made of multiple layers of high-permeability silicon steel sheets stacked and riveted together, effectively reducing eddy current losses generated by alternating magnetic flux.

[0041] Multiple sets of positioning through holes are opened in the connection area between the segmented stator unit 1 and the central coupling magnetic bridge 3. During assembly, high-precision positioning pins are first inserted into the positioning through holes to complete the pre-positioning, constrain the radial and circumferential positions of all segmented stator units 1, and ensure the overall concentricity of the stator. Then, bolts are inserted into the positioning through holes to lock all components, realize the rigid fixation of the segmented stator, and ensure that the circumferential air gap between the stator and the outer rotor is uniform.

[0042] The present invention also provides a magnetic levitation shaftless pump 6, including the above-mentioned magnetic levitation shaftless stator, and further including a housing 7. A segmented iron core is installed inside the housing 7. A shaftless motor rotor 8 coaxially sleeved around the segmented iron core and an impeller assembly 9 installed outside the shaftless motor rotor 8 are also installed inside the housing 7. A gap 10 is provided between the segmented iron core and the shaftless motor rotor 8, and between the impeller assembly 9 and the housing 7.

[0043] The outer casing 7 is provided with a flow channel inlet 11 and a flow channel outlet 12 that communicate with the gap 10.

[0044] Based on this, the outer casing 7 includes a top cover 701 and a bottom casing 702, and the impeller assembly 9 includes an impeller casing 901. The impeller casing 901 has a first cavity 13 inside, and a magnetically levitated shaftless stator is installed in the first cavity 13. The impeller casing 901 also has an annular second cavity 14 for accommodating and installing the shaftless motor rotor. The impeller casing 901 has a first end and a second end opposite to each other. An impeller blade 902 is fixed on the surface of the first end of the impeller casing 901, and an impeller sealing plate 903 is provided on the second end of the impeller casing 901. After the shaftless motor rotor is installed in the second cavity 14, the remaining space in the second cavity 14 is sealed with resin.

[0045] It is worth noting that the overall shape of the second cavity 14 is adapted to the shape of the rotor, and is annular.

[0046] Based on this, a flow channel through hole 15 is provided on the first end of the impeller housing 901, and the flow channel through hole 15 is connected to the first cavity 13 and the flow channel inlet 11.

[0047] The entire machine eliminates three core vulnerable components of traditional pumps: drive shaft, mechanical bearings, and shaft end dynamic seals, eliminating frictional wear and the risk of leakage due to aging seals. The impeller assembly 9 is completely magnetically suspended and isolated from the stator, preventing the generation of metal friction debris and ensuring that no impurities are introduced when conveying high-purity pharmaceutical solutions or semiconductor chemicals. No lubricating grease is required, making it fully suitable for sterile and ultra-clean conveying conditions. The double-layer impeller sealing and isolation structure protects the permanent magnet rotor, eliminating the risk of penetration damage from high-temperature and highly corrosive media during long-term operation, thus extending the equipment's service life and significantly reducing the frequency of downtime for maintenance.

[0048] The permanent magnet rotor is directly embedded inside the second cavity 14. The impeller blade 902 can be regarded as part of the motor's external rotor. The stator is arranged in the first cavity 13, which greatly reduces the axial dimension of the pump body, reduces the space occupied by the equipment installation, shortens the fluid flow path, and reduces the hydraulic resistance loss. The overall pumping energy efficiency is better than that of the split magnetic levitation pump.

[0049] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A stator for a magnetically levitated shaftless motor, characterized in that, include: The segmented stator unit has an outer end and an inner end. The outer end of the segmented stator unit has a plurality of stator poles arranged in a fan shape. The inner end of the segmented stator unit extends with a central coupling magnetic bridge. The outer end of the central coupling magnetic bridge is connected to the inner end of the adjacent segmented stator unit. Each stator pole is wound with a torque winding. Each central coupling magnetic bridge is wound with a levitation winding. The central coupling magnetic bridge isolates the levitation magnetic flux generated by the levitation winding from the torque magnetic flux generated by the torque winding in the magnetic circuit.

2. The stator of the magnetic levitation shaftless motor according to claim 1, characterized in that, The number of segmented stator units is N, where N is an integer greater than or equal to 3.

3. The stator of the magnetic levitation shaftless motor according to claim 1, characterized in that, The segmented stator unit and the central coupling magnetic bridge are connected by bolts, and the segmented stator unit and the central coupling magnetic bridge are respectively provided with positioning through holes for bolt connection.

4. The stator of the magnetic levitation shaftless motor according to claim 1, characterized in that, Each segmented stator unit comprises multiple silicon steel sheets stacked together.

5. The stator of the magnetic levitation shaftless motor according to claim 1, characterized in that, The levitation winding can be any one of two-phase, three-phase, or multi-phase coil structures.

6. The stator of the magnetic levitation shaftless motor according to claim 1, characterized in that, The cross-sectional profile of the centrally coupled magnetic bridge can be any one of a rectangle, a trapezoid, or a tenon-and-mortise interlocking structure.

7. The stator of the magnetic levitation shaftless motor according to claim 1, characterized in that, The segmented stator unit is integrally formed with the stator pole and the central coupling magnetic bridge.

8. A magnetically levitated shaftless pump, characterized in that, The magnetic levitation shaftless motor stator according to claims 1-8 further includes a housing, the segmented iron core is installed inside the housing, and the shaftless motor rotor coaxially sleeved around the segmented iron core and the impeller assembly installed outside the shaftless motor rotor are also installed inside the housing. There are gaps between the segmented iron core and the shaftless motor rotor, and between the impeller assembly and the housing.

9. The magnetic levitation shaftless pump according to claim 8, characterized in that, The outer casing is provided with a flow channel inlet and a flow channel outlet that communicate with the gap.

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