Rotor ferromagnetic punching sheet, rotor assembly, manufacturing method thereof, and liquid-cooled pump

Abstract

The present invention relates to the technical field of electronic pumps, and provides a rotor ferromagnetic punching sheet, a rotor assembly, a liquid-cooled pump, and a manufacturing method for the rotor assembly of the liquid-cooled pump. In the rotor ferromagnetic punching sheet, a plurality of magnet slots for placing magnets are arranged at intervals on the surface of the rotor ferromagnetic punching sheet. Among them, along the radial direction passing through the center of the rotor ferromagnetic punching sheet, the length of the magnet slot is greater than the width of the magnet slot. Due to the adoption of a tangential magnetic pole structure with a magnetic focusing effect, on the premise of maintaining the same rotor magnetic field intensity, the outer diameter of the rotor can be reduced, and correspondingly, the outer diameter of the stator can be reduced, thereby reducing the material consumption, volume, weight, and cost of the motor; in addition, the magnetic poles of the magnets are placed tangentially, avoiding the action of the magnets facing the armature magnetic field, and to a certain extent, the demagnetization resistance of the magnets can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic pumps, and particularly to a rotor ferromagnetic punching sheet, a rotor assembly, a manufacturing method thereof, and a liquid-cooled pump. Background Art

[0002] In recent years, canned pumps have been widely used in household, industrial, and automotive fields due to their fully enclosed and leak-free characteristics. Currently, asynchronous motors are still dominant in canned pump motors on the market. Since the rotor of an asynchronous motor needs to consume energy to generate a rotor magnetic field, while the rotor permanent magnet of a permanent magnet motor does not need to consume energy to maintain the rotor magnetic field, the permanent magnet motor has the characteristics of high efficiency and energy saving.

[0003] However, most of the existing permanent magnet rotor pole structures for canned pumps are magnetic rings, surface-mounted magnetic tiles, and "one"-type pole structures, which make the magnetic steel face the armature magnetic field directly, increasing the risk of demagnetization of the magnetic steel under the action of the armature magnetic field. In addition, in the existing pole structure technology, there are problems of poor sinusoidality of the air-gap magnetic field and large magnetic leakage. Moreover, in the existing manufacturing methods of canned pump rotors, before rotor injection molding, a process of crimping the rotor iron core and the rotor shaft is required, and the connection between the rotor injection molding material and the rotor iron core and the upper and lower end rings of the rotor is mostly a smooth structure, making the rotor manufacturing process more complicated and the rotor structure strength unable to meet the requirements of medium and high speeds of the rotor. Summary of the Invention

[0004] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a rotor ferromagnetic punching sheet, a rotor assembly, a manufacturing method thereof, and a liquid-cooled pump, so as to at least improve the performance of the rotor assembly and reduce the production cost.

[0005] According to an embodiment of the first aspect of the present invention, a rotor ferromagnetic punching sheet is provided. A plurality of magnet slots for placing magnetic steel are arranged at intervals on the surface of the rotor ferromagnetic punching sheet. Among them, along the radial direction passing through the center of the rotor ferromagnetic punching sheet, the length of the magnet slot is greater than the width of the magnet slot.

[0006] According to an embodiment of the present invention, all the magnet slots are circumferentially arranged at equal intervals around the center of the rotor ferromagnetic punching sheet.

[0007] According to an embodiment of the present invention, each magnet slot includes a magnet slot bottom and a magnet slot top located between the magnet slot bottom and the outer edge of the rotor ferromagnetic punching sheet. Among them, the magnet slot bottom forms an opening facing the center of the rotor ferromagnetic punching sheet, and the magnet slot top is configured to be a continuously extending closed shape.

[0008] According to an embodiment of the present invention, at the opening of the bottom of the magnet slot, a magnet positioning post is formed at the bottom of the magnet slot, wherein the distance between the magnet positioning posts of each magnet slot is less than the width of the magnet slot.

[0009] According to an embodiment of the present invention, a part of the rotor ferromagnetic punching sheet between adjacent magnet slots forms a core tooth portion, wherein an end of each core tooth portion is formed with a tooth bottom groove facing the center of the rotor ferromagnetic punching sheet.

[0010] According to an embodiment of the present invention, a self-locking point and a tooth portion circular groove are further formed on the surface of each core tooth portion.

[0011] According to an embodiment of the second aspect of the present invention, a rotor assembly is provided, including: a rotor core stacked by the rotor ferromagnetic punching sheets as described above, and a magnet installed in the magnet slot.

[0012] According to an embodiment of the present invention, the rotor assembly further includes: a rotor shielding sleeve sleeved outside the rotor core; a rotor shaft extending through the center of the rotor core; a rotor upper end ring and a rotor lower end ring disposed at both ends of the rotor core; and a rotor injection molding material filled in the gaps between the rotor upper end ring, the rotor lower end ring, the rotor core, the magnet, the rotor shielding sleeve and the rotor shaft.

[0013] According to an embodiment of the third aspect of the present invention, a liquid cooling pump is provided, including the rotor assembly as described above.

[0014] According to an embodiment of the fourth aspect of the present invention, a manufacturing method for a rotor assembly for a liquid cooling pump is provided, including the following steps:

[0015] Stamping a plurality of rotor core punching sheets as described above from silicon steel sheets by a punching machine, and stacking the rotor core punching sheets into a rotor core through self-locking between each other to obtain a first preformed rotor assembly;

[0016] Precision turning the outer circle of the first preformed rotor assembly by an outer circle turning tooling to obtain a second preformed rotor assembly;

[0017] Pressing the second preformed rotor assembly into a rotor shielding sleeve by a shielding sleeve pressing tooling to obtain a third preformed rotor assembly;

[0018] Sequentially placing the rotor lower end ring, the rotor shaft, the third preformed rotor assembly and the rotor upper end ring into corresponding cavities of an injection molding die of a vertical injection molding machine, and integrally injection molding with a rotor injection molding material to obtain a fourth preformed rotor assembly;

[0019] The fourth preformed rotor assembly is subjected to dynamic balance verification by removing weight through drilling holes in the upper end ring of the rotor, and is magnetized integrally through a magnetizing tooling to obtain a rotor assembly.

[0020] The beneficial effects of the present invention are as follows:

[0021] In the rotor ferromagnetic punching sheet, rotor assembly, its manufacturing method, and liquid cooling pump provided by the present invention, the magnetic steel grooves in the rotor ferromagnetic punching sheet are configured such that: along the radial direction passing through the center of the rotor ferromagnetic punching sheet, the length of the magnetic steel groove is greater than the width of the magnetic steel groove. By this setting method, the magnetic steel is arranged in the magnetic steel groove along the radial direction, and thus the magnetic poles of the magnetic steel are arranged along the tangential direction. Due to the adoption of the tangential magnetic pole structure with a magnetic concentration effect, on the premise of maintaining the same rotor magnetic field intensity, the outer diameter of the rotor can be reduced, and correspondingly the outer diameter of the stator can be reduced, thereby reducing the material consumption, volume, weight, and cost of the motor; in addition, the magnetic steel poles are placed tangentially, avoiding the action of the magnetic steel facing the armature magnetic field, and to a certain extent, the demagnetization resistance ability of the magnetic steel can be improved. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is a top view of a rotor ferromagnetic punching sheet according to an embodiment of the present invention;

[0024] Figure 2 is an exploded perspective view of a rotor assembly according to an embodiment of the present invention;

[0025] Figure 3 is Figure 2 an assembly drawing of the shown embodiment;

[0026] Figure 4 is Figure 2 a view of the upper end ring of the rotor of the shown embodiment.

[0027] Reference Signs:

[0028] 1. Rotor shaft; 21. Upper rotor ring; 211. End ring groove; 212. End ring tooth; 22. Lower rotor ring; 3. Rotor injection molding; 4. Magnet; 5. Rotor shielding sleeve; 6. Rotor iron core; 60. Rotor iron core punching sheet; 61. Top of magnet groove; 62. Bottom of magnet groove; 63. Self-locking point; 64. Magnet positioning post; 65. Tooth bottom groove; 66. Magnet groove; 67. Iron core tooth part; 68. Tooth part circular groove; Y1. Tooth part center line; Y2. Magnet groove center line; Y3. Outer circle of rotor iron core; A. Center. Detailed implementation mode

[0029] The following further describes in detail the implementation mode of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0030] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of 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 a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "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 a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0032] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0033] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0034] Now refer to Figures 1 to 4 , and a detailed description of the present invention will be given. As Figures 1 to 4 shown, the present invention provides a rotor ferromagnetic punching sheet 60. Specifically, a plurality of magnet slots 66 for placing magnets 4 are arranged at intervals on the surface of the rotor ferromagnetic punching sheet 60, wherein, along the radial direction passing through the center A of the rotor ferromagnetic punching sheet 60, the length of the magnet slot 66 is greater than the width of the magnet slot 66. In an alternative embodiment, all the magnet slots 66 can be circumferentially arranged at equal intervals around the center A of the rotor ferromagnetic punching sheet 60.

[0035] According to the above description, by setting the length of the magnet slot 66 to be greater than the width of the magnet slot 66 along the radial direction passing through the center A of the rotor ferromagnetic punching sheet 60, the magnet 4 is placed along the radial direction of the rotor ferromagnetic punching sheet 60 during installation. Through this setting method, the magnet 4 is arranged in the magnet slot 66 along the radial direction, and further the magnetic poles of the magnet 4 are arranged along the tangential direction. Since a tangential magnetic pole structure with a magnetic concentrating effect is adopted, on the premise of maintaining the same rotor magnetic field intensity, the outer diameter of the rotor can be reduced, and correspondingly the outer diameter of the stator can be reduced, thereby reducing the material consumption, volume, weight, and cost of the motor; in addition, the magnetic poles of the magnet are placed tangentially, avoiding the action of the magnet facing the armature magnetic field, and to a certain extent, the demagnetization resistance of the magnet can be improved.

[0036] Further as shown in the figure, in an embodiment of the present invention, each magnet slot 66 includes a magnet slot bottom 62 and a magnet slot top 61 located between the magnet slot bottom 62 and the outer edge of the rotor ferromagnetic punching sheet 60. Specifically, the magnet slot bottom 62 forms an opening facing the center A of the rotor ferromagnetic punching sheet 60, and the magnet slot top 61 is configured as a continuously extending closed shape.

[0037] According to the above embodiments, in the tangential magnetic pole structure, the present invention adopts a structure with a closed top 61 and an open bottom 62 of the magnet slot. The closed top of the slot effectively solves the problem of poor sinusoidality of the air-gap magnetic field in the tangential magnetic pole structure, and enables the outer circle of the rotor to retain a complete circular structure, making the combination of the rotor core and the rotor shielding sleeve more firm, and avoiding the problem that the concave-convex structure of the outer circle of the rotor easily deforms the rotor shielding sleeve. In addition, the closed slot causes the armature magnetic field to form a shunt effect in the rotor, improving the demagnetization resistance of the rotor magnets. On the other hand, the open bottom of the slot effectively alleviates the problem of high magnetic leakage in the tangential magnetic pole structure, cuts off the magnetic circuit structure between adjacent core teeth, thereby improving the magnetic field utilization rate, further thinning the thickness of the rotor core, reducing the overall thickness of the rotor by 18%, and at the same time reducing the thickness of the stator, thereby reducing the material consumption, volume, weight and cost of the motor.

[0038] Further, in one embodiment, at the opening of the bottom 62 of the magnet slot, a magnet positioning post 64 may be formed on the bottom 62 of the magnet slot. Specifically, the distance between the magnet positioning posts 64 of each magnet slot 66 is less than the width of the magnet slot 66.

[0039] In addition, in one embodiment, a part of the rotor ferromagnetic punching sheet 60 between adjacent magnet slots 66 forms a core tooth portion 67. And among them, a tooth bottom groove 65 facing the center of the rotor ferromagnetic punching sheet 60 is formed at the end of each core tooth portion 67. In addition, in one embodiment, a self-locking point 63 and a tooth portion circular groove 68 are also formed on the surface of each core tooth portion 67.

[0040] In the actual manufacturing process, the function of the self-locking point 63 is to enable multiple rotor ferromagnetic punching sheets 60 to be stacked and connected to form a rotor core; in addition, in the actual manufacturing process, rotor injection molding plastic is injected into the rotor ferromagnetic punching sheet 60. At this time, the rotor injection molding plastic enters the tooth bottom groove 65 and the tooth portion circular groove 68, which can make the connection between the rotor ferromagnetic punching sheet 60 and other components more tight. Specifically, after injecting the rotor injection molding plastic into the tooth portion circular groove 68, the connection in the longitudinal direction of the rotor assembly can be strengthened, and after injecting the rotor injection molding plastic into the tooth bottom groove 65, the connection between the rotor ferromagnetic punching sheet 60 and the rotor shaft can be strengthened.

[0041] On the other hand, the present invention also provides a rotor assembly, which includes: a rotor core 6 stacked by the rotor ferromagnetic punching sheets 60 as described above, and a magnet 4 installed in the magnet groove 66. Further, the rotor assembly further includes: a rotor shielding sleeve 5 sleeved outside the rotor core 6, a rotor shaft 1 extending through the center of the rotor core 6, a rotor upper end ring 21 and a rotor lower end ring 22 provided at both ends of the rotor core 6, and a rotor injection molding material 3 filled in the gaps between the rotor upper end ring 21, the rotor lower end ring 22, the rotor core 6, the magnet 4, the rotor shielding sleeve 5 and the rotor shaft 1. It should be noted here that in the rotor injection molding structure, the rotor injection molding material 3 is connected to the rotor core 6 and the upper and lower end rings of the rotor by a tooth groove structure, making the connection more compact and firm, and improving the rotor structure strength.

[0042] Further, the present invention also provides a liquid cooling pump, which includes the rotor assembly as described above. Since both the rotor assembly and the liquid cooling pump of the present invention adopt the rotor ferromagnetic punching sheet structure as described above, they have all the above-mentioned advantages.

[0043] In addition, the present invention also provides a manufacturing method for a rotor assembly of a liquid cooling pump. The method may include the following steps: punching a plurality of rotor core punching sheets as described above from silicon steel sheets by a punching machine, and stacking the rotor core punching sheets into a rotor core by self-locking between them to obtain a first preformed rotor assembly; precision turning the outer circle of the first preformed rotor assembly by an outer circle turning tooling to obtain a second preformed rotor assembly; pressing the second preformed rotor assembly into a rotor shielding sleeve by a shielding sleeve pressing tooling to obtain a third preformed rotor assembly; sequentially placing the rotor lower end ring, the rotor shaft, the third preformed rotor assembly and the rotor upper end ring into the corresponding cavities of an injection molding die of a vertical injection molding machine, and integrally injection molding with the rotor injection molding material to obtain a fourth preformed rotor assembly; and checking the dynamic balance of the fourth preformed rotor assembly by the method of removing weight by drilling holes in the rotor upper end ring, and performing overall magnetization on the fourth preformed rotor assembly by a magnetization tooling to obtain the rotor assembly.

[0044] In the method provided by the present invention, in addition to all the above-mentioned advantages, the method also has the following advantages: in the rotor manufacturing method, the shaft is embedded in the rotor by injection molding, saving the rotor shaft pressing process, thus simplifying the entire rotor manufacturing process and improving production efficiency.

[0045] The present invention will be described in more detail below in the form of embodiments. As shown in the figure, the present invention provides a rotor assembly for a liquid cooling pump / canned motor pump, which includes a rotor shaft 1, a rotor upper end ring 21, a rotor lower end ring 22, a rotor injection molding material 3, a plurality of magnets 4, a rotor shielding sleeve 5 and a rotor core 6.

[0046] Specifically, the upper rotor end ring 21 and the lower rotor end ring 22 include a plurality of end ring grooves 211 and a plurality of end ring teeth 212. The rotor core 6 is composed of a plurality of rotor core punching sheets 60. Further, the rotor core punching sheet 60 includes a plurality of magnet groove tops 61, a plurality of magnet groove bottoms 62, a plurality of self-locking points 63, a plurality of magnet positioning posts 64, a plurality of tooth bottom grooves 65, a plurality of magnet grooves 66, a plurality of core tooth parts 67, and a plurality of tooth part round grooves 68.

[0047] In one embodiment, the upper rotor end ring 21 and the lower rotor end ring 22 are made of metal materials, which have the functions of axial positioning and dynamic balance verification for weight removal. There are end ring grooves 211 and end ring teeth 212 with the same number as the magnet grooves 66 provided thereon. The end ring grooves 211 and the end ring teeth 212 are evenly distributed, and the symmetry center line of the end ring groove 211 is axially coplanar with the midline Y2 of the magnet groove, while the symmetry center line of the end ring tooth 212 is axially coplanar with the midline Y1 of the tooth part.

[0048] The rotor core 6 is laminated by a plurality of rotor core punching sheets 60 through the action of the self-locking points 63. The midline Y2 of the magnet groove 66 passes through the center A of the outer circle Y3 of the rotor core, and the magnet groove has a rectangular structure. The magnet groove top 61 is a closed structure, the magnet groove bottom 62 is an open structure, and magnet positioning posts 64 are respectively provided on both sides of the opening. The midline Y1 of the core tooth part 67 passes through the center A of the outer circle Y3 of the rotor core, and the core tooth part 67 is provided with a tooth part round groove 68, a self-locking point 63, and a tooth bottom groove 65 along the midline Y1 of the tooth part.

[0049] In one embodiment, the magnet 4 is internally placed in the magnet groove 66 by an axial insertion method, and is radially positioned by the magnet positioning posts 64 and axially positioned by arranging the upper rotor end ring 21 and the lower rotor end ring 22. The rotor injection molding 3 is filled in the gaps between the upper rotor end ring, the lower rotor end ring, the rotor core, the magnet, the rotor shield sleeve, and the rotor shaft, which includes the end ring groove 211, the magnet groove bottom 62, the tooth bottom groove 65, and the tooth part round groove 68, so that the rotor injection molding 3 is more tightly and firmly combined with the rotor core 6, the upper rotor end ring 21, and the lower rotor end ring 22.

[0050] In an alternative embodiment, in the radial view of the permanent magnet 4, the four corners are rounded with a radius of C0.5 - C1, while the four corners of the permanent magnet slot 66 are rounded with a radius of C0.2 - C0.4, creating a gap between the four corners of the permanent magnet 4 and the rotor core 6, which can improve the demagnetization resistance of the permanent magnet corners to a certain extent. In addition, the minimum width of the top 61 of the permanent magnet slot is 0.5 mm - 1.2 mm, and it is a closed slot, forming a magnetic leakage bridge structure, which can shunt the armature magnetic field to a certain extent, improve the demagnetization resistance of the rotor permanent magnet, and can significantly improve the sinusoidality of the air-gap magnetic field and greatly reduce the harmonic content of the air-gap magnetic field, especially the 5th harmonic content, which can be reduced by 2 - 3 times. Further, the bottom 62 of the permanent magnet slot is an open structure, and the opening width is 0.5 - 0.8 times the width of the permanent magnet slot 66, so that the magnetic circuit structure between two adjacent core teeth adjacent to the permanent magnet 4 is cut off, thereby improving the magnetic field utilization rate, and then reducing the thickness of the rotor core, so that the overall thickness of the rotor can be reduced by 18%, and at the same time, the thickness of the stator can be reduced, thereby reducing the material consumption, volume, weight and cost of the motor.

[0051] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or equivalently replace some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotor assembly, characterized in that, Comprising: A rotor ferromagnetic punching sheet, on the surface of which there are a plurality of magnet slots arranged at intervals for placing magnets. Among them, along the radial direction passing through the center of the rotor ferromagnetic punching sheet, the length of the magnet slot is greater than the width of the magnet slot; among them, the part of the rotor ferromagnetic punching sheet between adjacent magnet slots forms a core tooth part, and at the end of each core tooth part, there is a tooth bottom groove facing the center of the rotor ferromagnetic punching sheet, and a tooth part circular groove is also formed on the surface of each core tooth part; among them, rotor injection molding material is injected into the tooth part circular groove to strengthen the connection in the longitudinal direction of the rotor assembly, and rotor injection molding material is injected into the tooth bottom groove to strengthen the connection between the rotor ferromagnetic punching sheet and the rotor shaft; A rotor core, stacked by the rotor ferromagnetic punching sheets; Magnets, installed in the magnet slots; A rotor shielding sleeve, sleeved outside the rotor core; A rotor shaft, extending through the center of the rotor core; A rotor upper end ring and a rotor lower end ring, arranged at both ends of the rotor core. The rotor upper end ring and the rotor lower end ring include a plurality of end ring slots and a plurality of end ring teeth, which are evenly distributed, and the symmetry center line of the end ring slot is axially coplanar with the midline of the magnet slot, and the symmetry center line of the end ring tooth is axially coplanar with the midline of the tooth part; Rotor injection molding material, filled in the gaps between the rotor upper end ring, the rotor lower end ring, the rotor core, the magnets, the rotor shielding sleeve and the rotor shaft.

2. The rotor assembly according to claim 1, wherein All the magnet slots are circumferentially arranged at equal intervals around the center of the rotor ferromagnetic punching sheet.

3. The rotor assembly according to claim 1, characterized in that, Each magnet slot includes a magnet slot bottom and a magnet slot top located between the magnet slot bottom and the outer edge of the rotor ferromagnetic punching sheet. Among them, the magnet slot bottom forms an opening facing the center of the rotor ferromagnetic punching sheet, and the magnet slot top is configured as a continuously extending closed shape.

4. The rotor assembly according to claim 3, wherein, At the opening of the magnet slot bottom, a magnet positioning post is formed on the magnet slot bottom, and the distance between the magnet positioning posts of each magnet slot is less than the width of the magnet slot.

5. The rotor assembly according to claim 1, wherein A self-locking point is also formed on the surface of each core tooth part.

6. A liquid cooling pump, characterized in that, Comprising the rotor assembly according to any one of claims 1 to 5.

7. A manufacturing method for a rotor assembly of a liquid-cooled pump, characterized in that, Comprising the following steps: Stamping a plurality of rotor ferromagnetic punching sheets of the rotor assembly according to any one of claims 1 to 5 from silicon steel sheets by a punching press, and stacking the rotor core punching sheets into a rotor core through self-locking between each other to obtain a first preformed rotor assembly; Precision turning the outer circle of the first preformed rotor assembly by an outer circle turning tooling to obtain a second preformed rotor assembly; Pressing the second preformed rotor assembly into a rotor shielding sleeve by a shielding sleeve pressing tooling to obtain a third preformed rotor assembly; Sequentially placing the rotor lower end ring, the rotor shaft, the third preformed rotor assembly and the rotor upper end ring into the corresponding cavities of the injection molding die of a vertical injection molding machine, and integrally injection molding with rotor injection molding material to obtain a fourth preformed rotor assembly; The fourth preformed rotor assembly is subjected to dynamic balance verification by removing weight through drilling holes in the upper end ring of the rotor, and is magnetized as a whole through a magnetizing tooling to obtain a rotor assembly.

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