Stator module, motor and electrical device

Abstract

A stator module, a motor and an electrical device. The stator module (2) comprises a stator core (21) and a plurality of stator windings (22), wherein a plurality of teeth (24) are arranged on the inner side of the stator core (21) at intervals, the stator windings (22) and the teeth (24) are correspondingly arranged, the stator windings (22) are sleeved on the corresponding teeth (24), and the plurality of stator windings (22) are connected in series to form a module winding. The motor comprises a base (1) and at least one stator module (2), wherein the stator module (2) is connected to the base (1).

Description

Stator module, motor and electrical equipment CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese patent application No. 202311715531.4 filed on December 13, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure belongs to the technical field of motors, and particularly relates to a stator module, a motor, and an electrical device. Background Art

[0003] With the development of technology, the requirements for the drive of CT (Computed Tomography) machines are becoming increasingly higher. Direct drive is being adopted by more and more high-end CT machines. CT machines using direct drive usually use large hollow ring motors.

[0004] In the related art, the manufacturing cost of the large hollow ring motor is high and the manufacturing method of the large hollow ring motor will affect the performance and reliability of the large hollow ring motor. Therefore, the manufacturing cost, performance and reliability of the large hollow ring motor in the related art have room for improvement. Summary of the Invention

[0005] The present disclosure provides a stator module, a motor, and an electrical device, which aim to reduce the manufacturing cost of a large hollow ring motor to at least a certain extent and improve its reliability.

[0006] In a first aspect of the present disclosure, a stator module is provided, wherein the stator module includes a stator core and a plurality of stator windings. A plurality of teeth are arranged at intervals on the inner side of the stator core. The stator windings and the teeth are arranged correspondingly. The stator windings are mounted on the corresponding teeth. The plurality of stator windings are connected in series to form a module winding.

[0007] In a second aspect of the present disclosure, a motor is further provided, comprising: a base; and at least one of the above-mentioned stator modules connected to the base.

[0008] In a third aspect of the present disclosure, the present disclosure further provides an electrical device, which includes the above-mentioned motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0010] FIG1 shows a schematic structural diagram of a stator module according to some embodiments of the present disclosure;

[0011] FIG2 is a schematic structural diagram of a stator core provided with teeth of the stator module in FIG1 ;

[0012] FIG3 shows a schematic structural diagram of a motor having the stator module shown in FIG1 ;

[0013] FIG4 shows a schematic structural diagram of a bearing of the stator module in FIG1 ;

[0014] FIG5 shows a schematic top view of a stator module according to some embodiments of the present disclosure;

[0015] FIG6 shows a schematic cross-sectional view taken along line AA in FIG5 ;

[0016] FIG. 7 shows an enlarged schematic diagram of portion I of FIG. 6 .

[0017] The correspondence between the figure marks and component names is as follows: 1. Machine base; 11. Bearing; 111. Outer ring; 1111. First stop; 1112. Third stop; 112. Inner ring; 1121. Second stop; 2. Stator module; 21. Stator core; 22. Stator winding; 23. Limit block; 24. Tooth; 25. Positioning groove; 3. Rotor module; 31. Rotor yoke; 32. Rotor magnet. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to understand the present disclosure more clearly, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present disclosure.

[0019] The output method of large hollow ring motors differs from the torque output of conventional shafted motors, which utilize a rotating shaft. Large hollow ring motors do not utilize the traditional rotating shaft or dual-bearing support scheme, making rotor support more difficult. Furthermore, the relatively small thickness of large hollow ring motors results in poor stator stiffness.

[0020] In the related art, the stator of a large hollow ring motor is formed by splicing each layer of sector-shaped iron cores and then stacking multiple layers of sector-shaped iron cores. In each layer of sector-shaped iron cores, the sector-shaped iron cores are spliced ​​together to eventually form a full-circle iron core. Then, multiple layers of full-circle iron cores are stacked on each other so that the splicing gaps of the sector-shaped iron cores in adjacent full-circle iron cores are not in the same position to form the stator iron core. After the splicing and stacking form a full-circle stator iron core, the stator winding is arranged in a distributed winding form, that is, the stator winding spans different sector-shaped iron cores to fix the entire stator into a whole on the circumference.

[0021] If the design and manufacturing solutions in related technologies are adopted, the motor stator will undergo significant deformation, which will in turn affect the cost, performance and reliability of the motor.

[0022] Based on the above technical problems, the present disclosure provides a stator module, a motor and an electrical device, aiming to reduce the manufacturing cost of large hollow ring motors to at least a certain extent and improve their reliability.

[0023] Figure 1 shows a schematic diagram of the structure of a stator module according to some embodiments of the present disclosure, and Figure 2 shows a schematic diagram of the structure of a stator core with teeth configured in the stator module of Figure 1. In combination with Figures 1 and 2, the stator module 2 includes a stator core 21 and stator windings 22. Two or more teeth 24 are spaced apart on the inner side of the stator core 21. The stator windings 22 and the teeth 24 are arranged correspondingly, and the stator windings 22 are mounted on the corresponding teeth 24. The multiple stator windings 22 of each stator module 2 are connected in series to form a module winding.

[0024] The stator module 2 provided by the present disclosure has stator windings 22 mounted on corresponding teeth 24. Multiple stator windings 22 are connected in series to form a modular winding. Once the modular windings of the stator module 2 are wired, they can output torque to the rotor module they are mating with. In other words, the stator module can be independently manufactured and assembled, then assembled as a whole onto the motor and wired. This eliminates the need to assemble and wire the stator windings on the stator module after the stator module is assembled onto the motor. Consequently, the stator module 2 according to some embodiments of the present disclosure has a simple structure, thus reducing assembly steps, avoiding errors, and thus reducing costs and improving reliability.

[0025] In some embodiments, the teeth 24 in the stator module 2 can be integrally formed with the stator core 21. This facilitates the manufacture of the stator core 21 and the teeth 24 while ensuring sufficient rigidity and connection strength between the stator core 21 and the teeth 24. This ensures sufficient rigidity and connection strength even when the thickness of the stator module 2 is very small. Furthermore, the teeth 24 and the stator core 21 can be formed from stamped sheets, resulting in high material utilization, high rigidity, and good manufacturability, making them suitable for motors of varying sizes.

[0026] In other embodiments, the teeth 24 in the stator module 2 may also be welded or plugged into the stator core 21 , which is not limited here.

[0027] 1 and 2 , the stator module 2 may further include a stopper 23. The stopper 23 may be made of an insulating composite material such as epoxy glass cloth. A stopper 23 is provided between two adjacent teeth 24 so that the two ends of the stator winding 22 are respectively limited by the stator core 21 and the stopper 23 to constrain the stator winding 22 and prevent the stator winding 22 from falling off the corresponding teeth 24. In some embodiments, a positioning groove 25 is provided on the side of the tooth 24. The positioning groove 25 may be provided on opposite sides of two adjacent teeth 24. The end of the stopper 23 is connected to the positioning groove 25. The positioning groove 25 may be V-shaped, and the end of the stopper 23 matches the positioning groove 25. During assembly, glue may be applied to the positioning groove 25 before the stopper 23 is inserted into the corresponding positioning groove 25 to improve the reliability of the connection of the stopper 23 within the corresponding positioning groove 25. In other embodiments, the end of the limiting block 23 may also be welded or bonded to the end of the tooth 24 , which is not limited here.

[0028] The stator winding 22 is a concentric winding wound according to the wire diameter and number of turns determined by the electromagnetic scheme. When assembling the stator winding 22, an insulating material, such as insulating slot paper NHN or a wire rack made of insulating material, can be placed between the teeth 24 of the stator core 21 and the stator winding 22. After the multiple stator windings 22 of each stator module 2 are connected in series to form a module winding, U, V, and W terminal blocks are respectively led out for subsequent use. After the wiring is completed, the entire unit is vacuum pressure-impregnated with insulating varnish. In some embodiments, the module windings of multiple stator modules 2 can be connected in parallel or in series, and the specific settings can be made according to the output power of the motor, which is not limited here.

[0029] Figure 3 shows a schematic structural diagram of a motor having the stator module shown in Figure 1. The motor disclosed herein comprises a base 1 and the aforementioned stator module 2. At least one stator module 2 is provided, and at least one stator module 2 is connected to the base 1.

[0030] In the motor provided by the present disclosure, the stator windings 22 of the stator module 2 are mounted on corresponding teeth 24, and multiple stator windings 22 are connected in series to form a modular winding. Once the modular windings of the stator module 2 are wired, they can output torque to the rotor module they are mating with. In other words, the stator module can be independently manufactured and assembled, then assembled as a whole onto the motor and wired. This avoids the need to assemble and wire the stator windings on the stator module after the stator module is assembled onto the motor. As a result, the stator module 2 according to some embodiments of the present disclosure has a simple structure, thus reducing assembly steps, avoiding errors, and thus reducing costs and improving reliability.

[0031] In some embodiments, a plurality of stator modules 2 may be provided. A plurality of stator modules 2 are sequentially connected to the base 1 around the circumference of the base 1 to form a first annular structure. When installing the stator module 2, the stator module 2 to be assembled can be manufactured first, and then the plurality of stator modules 2 can be assembled on the base 1, without having to bridge the stator windings across the teeth on adjacent electronic modules. Therefore, the stator module 2 according to some embodiments of the present disclosure has a simple structure, thereby avoiding errors, reducing costs, and improving reliability. In other embodiments, only one stator module 2 may be provided, and after the stator module 2 is connected, it can output torque to the rotor module that cooperates with it.

[0032] 1 to 3 , the stator core 21 may be fan-shaped, with the ends of adjacent stator cores 21 butted together to form the first annular structure, thereby avoiding the need for overlapping adjacent stator cores 21 during press-fitting, thereby improving the utilization of the stator core 21 .

[0033] It should be noted that the stator module 2 of the present application can adopt a pole slot arrangement of 12 slots and 10 poles, or other pole slot arrangements such as 12 slots and 8 poles, or 9 slots and 6 poles, without limitation. Accordingly, seven stator modules 2 can be used in parallel to form the entire motor solution, and six, eight, or other larger or smaller stator modules 2 can be used to assemble a motor, which will not be discussed in detail here.

[0034] Figure 4 illustrates a schematic structural diagram of the bearing of the stator module in Figure 1 , Figure 5 illustrates a schematic top view of the stator module according to some embodiments of the present disclosure, and Figure 6 illustrates a schematic cross-sectional view taken along line AA in Figure 5 . In conjunction with Figure 1 and Figures 4-6 , in some embodiments, the motor base 1 may include a bearing 11 having an outer ring 111 and an inner ring 112 that are rotatable relative to each other. The stator cores 21 of multiple stator modules 2 are connected to the outer ring 111. The motor also includes a rotor module 3, which is connected to the inner ring 112. When power is applied to the stator module 2, a magnetic field is generated to drive the rotor module 3 to rotate.

[0035] Figure 7 shows an enlarged schematic diagram of portion I of Figure 6 . In conjunction with Figures 1 and 4-7 , in some embodiments, the end of the outer ring 111 can be provided with a first stop 1111, into which multiple stator cores 21 are sequentially connected. During assembly, the outer circumference of the stator core 21 can be placed against the inner wall of the first stop 1111 to radially position the stator core 21. The stator core 21 can then be secured to the end surface of the first stop 1111 using screws or other fasteners. This completes the assembly of the stator module 2 on the outer ring 111. This assembly method ensures the coaxiality of the first annular structure and the bearing 11. Subsequently, after all stator modules 2 are secured, the UVW phases of different stator modules 2 are connected in parallel or series, ultimately leading to the UVW phases of the entire motor. Finally, the stopper 23 is assembled and the insulating varnish is applied and cured.

[0036] In conjunction with Figures 4-7 , in some embodiments, a second stop 1121 is provided at the end of the inner ring 112, and the rotor module 3 is connected to the second stop 1121. In some embodiments, the rotor module 3 includes a rotor yoke 31 and a plurality of rotor magnets 32, and the rotor yoke 31 is connected to the second stop 1121. The plurality of rotor magnets 32 are spaced apart on the outer circumference of the rotor yoke 31 to form a second annular structure. The second annular structure is spaced apart inside the first annular structure. The plurality of rotor magnets 32 can be connected to the outer circumference of the rotor yoke 31 by bonding or other means. The outer wall of the rotor yoke 31, equipped with the plurality of rotor magnets 32, can be attached to the inner wall of the second stop 1121 to radially position the rotor magnets 32. The rotor module 3 is then assembled to the inner ring 112 by screws or other fasteners. This assembly method ensures the coaxiality of the second annular structure and the bearing 11.

[0037] In some embodiments, in combination with Figures 5-7, a third stop 1112 is also provided at the end of the outer ring 111 of the bearing 11. The third stop 1112 and the first stop 1111 are coaxially arranged, and the third stop 1112 is arranged in the first stop 1111, and parts of the multiple stator windings 22 are arranged in the third stop 1112.

[0038] In some embodiments, the bearing 11 may be a contact ball bearing 11 , such as a double-row angular contact ball bearing 11 , to withstand radial force, axial force, and bending moment of the stator and rotor.

[0039] In other embodiments, the base 1 may also include two bearings 11 , that is, the stator module 2 and the rotor module 3 are respectively assembled on the two bearings 11 , which is not limited here.

[0040] Based on the above motor, the present disclosure further provides an electrical device, which includes the above motor.

[0041] In the electrical device provided by the present disclosure, the stator windings 22 of the motor's stator module 2 are mounted on corresponding teeth 24, and multiple stator windings 22 are connected in series to form a modular winding. Once the modular windings of the stator module 2 are wired, they can output torque to the mating rotor module. In other words, the stator module can be independently manufactured and assembled, then assembled as a whole onto the motor and wired. This avoids the need to assemble and wire the stator windings on the stator module after the stator module is assembled onto the motor. As a result, the stator module 2 according to some embodiments of the present disclosure has a simple structure, which can save assembly steps, avoid errors, reduce costs, and improve reliability.

[0042] In some embodiments, the electrical device may be a CT machine or other types of electrical devices, which are not limited here.

[0043] In the present disclosure, 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. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply 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 disclosure.

[0045] In this disclosure, unless otherwise expressly specified or limited, the terms "connect," "fix," etc. should be understood broadly. For example, "fix" can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two elements or an interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0046] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this disclosure, "plurality" means two or more, unless otherwise specifically defined.

[0047] Although the embodiments of the present disclosure have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A stator module comprises a stator core and a plurality of stator windings, wherein a plurality of teeth are arranged at intervals on the inner side of the stator core, the stator windings and the teeth are arranged correspondingly, the stator windings are sleeved on the corresponding teeth, and the plurality of stator windings are connected in series to form a module winding.

2. The stator module according to claim 1, further comprising: A limiting block is arranged between two adjacent teeth to limit the stator winding.

3. The stator module according to claim 2, wherein: A positioning groove is arranged on the side of the tooth, and the end of the limit block is connected to the positioning groove.

4. The stator module according to any one of claims 1 to 3, wherein: The teeth are integrally formed on the stator core.

5. The stator module according to any one of claims 1 to 4, wherein: The teeth and the stator core are structures obtained by punching.

6. A motor, comprising: Machine base; as well as At least one stator module according to any one of claims 1 to 5, connected to the machine base.

7. The motor according to claim 6, wherein: A plurality of stator modules are provided, and the plurality of stator modules are sequentially connected to the base around the circumference of the base to form a first annular structure.

8. The motor according to claim 7, wherein: The module windings of the plurality of stator modules are connected in parallel or in series.

9. The motor according to claim 7, wherein: The ends of the adjacent stator cores are butt-jointed.

10. The electric machine according to any one of claims 7 to 9, wherein: The base includes a bearing, the bearing has an outer ring and an inner ring that can rotate relatively, and the stator cores of the plurality of stator modules are connected to the outer ring; The motor further comprises a rotor module, wherein the rotor module is connected to the inner ring.

11. The electric machine according to claim 10, wherein: A first stop is provided at the end of the outer ring, and a plurality of stator cores are sequentially connected to the first stop.

12. The electric machine according to any one of claims 6 to 10, wherein: A second stop is provided at the end of the inner ring, and the rotor module is connected in the second stop.

13. The electric machine according to claim 12, wherein: The rotor module comprises: a rotor yoke connected in the second stop; and A plurality of rotor magnets are arranged at intervals on the outer peripheral surface of the rotor yoke to form a second annular structure, and the second annular structure is arranged at intervals on the inner side of the first annular structure.

14. The electric machine according to any one of claims 10 to 13, wherein: The end of the outer ring is also provided with a third stop coaxially arranged with the first stop, the third stop is arranged inside the first stop, and the third stop is used to accommodate the stator winding.

15. An electrical device comprising the motor according to any one of claims 6 to 14.

16. The electrical device according to claim 15, wherein: The electrical equipment is a CT machine.

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