Rotor assembly, water-cooled electric generator, and vehicle

Abstract

The application provides a rotor assembly, a water-cooled generator and a vehicle; the rotor assembly comprises a rotor core and a motor shaft; the motor shaft is inserted into the rotor core through a limiting assembly; the motor shaft has a front bearing end face and a rear bearing end face in the axial direction thereof; and a dynamic balance hole group is arranged on the front bearing end face and the rear bearing end face. In order to realize the balance of the rotor assembly in the axial direction, the dynamic balance hole group is arranged on the front bearing end face and the rear bearing end face, and the arrangement of the dynamic balance hole group replaces the existing mode of adjusting the balance of the rotor assembly in the axial direction through an end plate. In this way, the end plate is reduced, that is, the weight of the material of the rotor assembly is reduced, so that the rotor assembly is more lightweight (about 8% of the total weight of the rotor assembly is reduced), and the power density of the generator can be improved to a certain extent. In addition, the arrangement of the end plate is reduced, the manufacturing cost caused by the manufacturing of the end plate can be reduced, and thus the manufacturing cost of the generator can be reduced.

Description

Technical Field

[0001] This application relates to the field of electric motor technology, and in particular to rotor assemblies, water-cooled generators, and vehicles. Background Technology

[0002] To achieve dynamic balance of rotor components, traditional generator rotor assemblies typically require rotor core end plates designed on both ends of the rotor core. These end plates serve two purposes: firstly, to axially lock the rotor core, ensuring the stacking coefficient and providing an effective working surface; and secondly, to provide a weight-relief area for the dynamic balance of the rotor components.

[0003] However, the above structural design increases the manufacturing process and product weight, while also resulting in a significantly lower power density.

[0004] Therefore, there is an urgent need for a rotor assembly, a water-cooled generator, and a vehicle to address the technical problems existing in the current technology to a certain extent. Utility Model Content

[0005] The purpose of this application is to provide a rotor assembly, a water-cooled generator, and a vehicle. By removing the rotor core end plates at both ends of the rotor core, the rotor assembly is made lighter (by about 8%) by reducing materials, thereby increasing power density. At the same time, the reduction of materials can reduce the manufacturing cost of the generator and enhance product competitiveness. On the other hand, it reduces assembly steps, increases production line cycle time, and improves production efficiency.

[0006] This application provides a rotor assembly disposed within a stator assembly; comprising: The rotor core is disposed within the stator assembly; The motor spindle is inserted into the rotor core via a limiting component and can drive the rotor core to move within the stator assembly to cut magnetic field lines. The motor spindle has a front bearing end face and a rear bearing end face along its axial direction. Both the front bearing end face and the rear bearing end face are provided with dynamic balancing holes to balance the rotor assembly in its axial direction.

[0007] In the above technical solution, the dynamic balancing hole group on the front bearing end face has a first preset number of dynamic balancing holes, and the first preset number of dynamic balancing holes are arranged at intervals along the circumferential direction of the motor spindle. The dynamic balancing hole group on the rear bearing end face has a second preset number of dynamic balancing holes, and the second preset number of dynamic balancing holes are arranged at intervals along the circumferential direction of the motor spindle. The first preset quantity is equal to the second preset quantity or the first preset quantity is not equal to the second preset quantity.

[0008] In the above technical solution, the limiting component further includes an axial limiting part and a radial limiting part; The axial limiting portion extends along the axial direction of the motor spindle, a portion of which is formed on the side of the rotor core facing the motor spindle, and the remaining portion is formed on the side of the motor spindle facing the rotor core. The portion of the axial limiting part formed on the rotor core can be inserted into the portion of the axial limiting part formed on the motor core shaft along the axial direction of the motor core shaft, or the portion of the axial limiting part formed on the motor core shaft can be inserted into the portion of the axial limiting part formed on the rotor core along the axial direction of the motor core shaft, so as to restrict the rotation of the motor core shaft and the rotor core in the circumferential direction. The radial limiting portion is formed on both sides of the motor spindle along its axial direction, and the radial limiting portion extends along the circumferential direction of the motor spindle and respectively fits against both sides of the rotor core along its axial direction, so as to restrict the axial movement of the motor spindle and the rotor core.

[0009] In the above technical solution, the axial limiting part further includes a protrusion and the keyway; One of the protrusion and the keyway is formed on the side of the motor spindle facing the rotor core, and the other is formed on the side of the rotor core facing the motor spindle. The protrusion is inserted into the keyway along the axial direction of the motor spindle to restrict the rotation of the motor spindle and the rotor core in the circumferential direction.

[0010] In the above technical solution, the radial limiting part further includes a groove and a retaining ring; The motor spindle is provided with slots on both sides of the rotor core along its axial direction. A portion of the retaining ring is confined within the retaining groove in the radial direction, while another portion protrudes from the retaining groove and fits against the rotor core.

[0011] In the above technical solution, the motor spindle is further provided with first weight-reducing holes that extend radially along the motor spindle in the circumferential direction; The motor spindle also has a second weight-reducing hole extending along the axial direction of the motor spindle.

[0012] In the above technical solution, further, bearing mounting positions for mounting bearings are formed at both ends of the motor spindle along its axial direction and on both sides of the rotor core.

[0013] In the above technical solution, the rotor core is further provided with third weight-reducing holes that extend along its axial direction at intervals along its circumferential direction. The rotor core is also provided with ventilation holes that extend along its axial direction at intervals along its circumferential direction.

[0014] This application also provides a water-cooled generator, including the rotor assembly described above.

[0015] This application also provides a vehicle including the aforementioned water-cooled generator.

[0016] Compared with the prior art, this application has the following beneficial effects: This application provides a rotor assembly disposed within a stator assembly; comprising: The rotor core is disposed within the stator assembly; The motor spindle is inserted into the rotor core via a limiting component and can drive the rotor core to move within the stator assembly to cut magnetic field lines. The motor spindle has a front bearing end face and a rear bearing end face along its axial direction. Both the front bearing end face and the rear bearing end face are provided with dynamic balancing holes to balance the rotor assembly in its axial direction.

[0017] In summary, to achieve axial balance of the rotor assembly, this application provides dynamic balancing hole groups on both the front and rear bearing end faces. The use of dynamic balancing hole groups replaces the existing method of adjusting the axial balance of the rotor assembly through end plates. This reduces the number of end plates, which in turn reduces the weight of the rotor assembly materials, making the rotor assembly lighter (reducing the total weight of the rotor assembly by about 8%), and can improve the power density of the generator to a certain extent.

[0018] Furthermore, reducing the number of end plates decreases manufacturing costs associated with their production, thereby lowering generator manufacturing costs and enhancing product competitiveness. Simultaneously, the reduction in materials and manufacturing processes leads to fewer production steps, increasing production line cycle time and overall efficiency.

[0019] Furthermore, the installation of the dynamic balancing hole group is equivalent to removing a portion from the front bearing end face and the rear bearing end face. This further reduces the weight of the rotor assembly, making the rotor assembly lighter.

[0020] This application also provides a water-cooled generator, including the rotor assembly described above. It thus possesses all the beneficial effects of the rotor assembly, which will not be specifically elaborated upon here.

[0021] This application also provides a vehicle including the aforementioned water-cooled generator. Therefore, it possesses all the beneficial effects of a water-cooled generator, which will not be specifically elaborated upon here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the rotor assembly provided in this application from a first-view perspective; Figure 2 for Figure 1 AA section view in the middle; Figure 3 A schematic diagram of the rotor assembly provided in this application from a second perspective; Figure 4 A schematic diagram of the rotor assembly provided in this application from a third-person perspective; Figure 5 A schematic diagram of the rotor core in the rotor assembly provided in this application from a first-view perspective; Figure 6 A schematic diagram of the rotor core in the rotor assembly provided in this application from a second perspective; Figure 7 A schematic diagram of the motor spindle in the rotor assembly provided in this application from a first-view perspective; Figure 8 A schematic diagram of the motor spindle in the rotor assembly provided in this application from a second perspective; Figure 9 A simulation diagram of the rotor assembly provided in this application.

[0024] Reference numerals: 1-Rotor core; 101-Third weight reduction hole; 102-Ventilation hole; 2-Motor spindle; 201-Front bearing end face; 202-Rear bearing end face; 203-Dynamic balancing hole group; 204-Dynamic balancing hole; 205-First weight reduction hole; 206-Second weight reduction hole; 207-Bearing mounting position; 3-Limiting component; 301-Axial limiting part; 302-Radial limiting part; 303-Protrusion; 304-Keyway; 305-Slot; 306-Snap ring. Detailed Implementation

[0025] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order presented herein; rather, changes that will be apparent upon understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity. The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application. Throughout this specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. Conversely, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between. As used herein, the term "and / or" includes any one of the relevant items listed and any combination of any two or more of them. Although terms such as "first," "second," and "third" may be used herein to describe individual components, assemblies, regions, layers, or portions, these components, assemblies, regions, layers, or portions are not limited by these terms. More precisely, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as such in the examples may also be referred to as the second component, assembly, region, layer, or part. For ease of description, spatial relational terms such as “above,” “upper,” “below,” and “lower” may be used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relational terms are intended to include not only the orientation depicted in the drawings but also the different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element.Therefore, the term "above" includes both "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., oscillating 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly. The terminology used herein is for describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "comprising," "including," and "having" enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. Variations in the shapes shown in the figures may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the figures but include changes in shape that occur during manufacturing. The features of the examples described herein may be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible as will be apparent upon understanding the disclosure of this application.

[0026] Example 1 Traditional generator rotor assemblies have end plates at both ends of the rotor core to achieve dynamic balance. However, this existing structure not only increases manufacturing steps and product weight but also reduces power density. This application addresses the technical problems existing in the prior art by providing a rotor assembly, which is described below in conjunction with… Figures 1-8 The rotor assembly is described in detail.

[0027] Combination Figure 1 and Figure 2 As shown, the rotor assembly includes a rotor core 1, which is disposed within the stator assembly. During operation, the rotor core 1 rotates under the drive of the engine, cutting magnetic field lines within the stator assembly (stator core), thereby converting mechanical energy into electrical energy through the principle of electromagnetic induction. In other words, the stator core serves as a magnetic circuit carrier, and its high magnetic permeability optimizes the magnetic field distribution, improving energy conversion efficiency; the rotor core 1, through rotation, generates an alternating magnetic field, and together the two constitute a closed magnetic circuit.

[0028] The above-described structure of the stator assembly is understandable in the art. The stator assembly includes components such as an iron core, coils, and a housing. The iron core is made of laminated silicon steel sheets and is used to support the coils and concentrate magnetic lines of force.

[0029] Still combined Figure 1 and Figure 2As shown, the rotor assembly also includes a motor spindle 2, which is inserted into the rotor core 1 through a limiting component 3 and can drive the rotor core 1 to cut magnetic lines of force within the stator assembly.

[0030] Specifically, combined Figure 3 As shown, the motor spindle 2 has a front bearing end face 201 and a rear bearing end face 202 along its axial direction. Both the front bearing end face 201 and the rear bearing end face 202 are provided with dynamic balance hole groups 203 to balance the rotor assembly in its axial direction.

[0031] In other words, to achieve axial balance of the rotor assembly, this application provides dynamic balancing hole groups 203 on both the front bearing end face 201 and the rear bearing end face 202. The opening of dynamic balancing hole groups 203 replaces the existing method of adjusting the axial balance of the rotor assembly through end plates. In this way, the number of end plates is reduced, which reduces the weight of the rotor assembly material, making the rotor assembly lighter (reducing the total weight of the rotor assembly by about 8%), which can improve the power density of the generator to a certain extent.

[0032] Furthermore, reducing the number of end plates lowers manufacturing costs, thereby reducing generator manufacturing costs and enhancing product competitiveness. Simultaneously, the reduction in materials and manufacturing processes increases production line cycle time and improves overall production efficiency.

[0033] Furthermore, the setting of the dynamic balancing hole group 203 is equivalent to removing a portion of the front bearing end face 201 and the rear bearing end face 202. This further reduces the weight of the rotor assembly, making the rotor assembly lighter.

[0034] In the above technical solution, combined with Figure 3 and Figure 4 As shown, the dynamic balancing hole group 203 of the front bearing end face 201 has a first preset number of dynamic balancing holes 204, and the first preset number of dynamic balancing holes 204 are arranged at intervals along the circumferential direction of the motor spindle 2 on the front bearing end face 201.

[0035] Among them, the dynamic balance hole group 203 of the rear bearing end face 202 has a second preset number of dynamic balance holes 204, and the second preset number of dynamic balance holes 204 are arranged at intervals along the circumferential direction of the motor spindle 2. The first preset quantity is equal to the second preset quantity or the first preset quantity is not equal to the second preset quantity.

[0036] Optionally, the first preset quantity is combined Figure 3 The preferred number shown is 3, with the 3 dynamic balancing holes 204 arranged at intervals. Similarly, the second preset number is also 3, with the 3 dynamic balancing holes 204 arranged at intervals along the circumferential direction.

[0037] The derivation process for achieving rotor assembly dynamic balance by providing dynamic balancing hole groups 203 on the front bearing end face 201 and the rear bearing end face 202 is as follows: First, calculate the total allowable residual unbalance of motor spindle 2. The calculation is as shown in formula (1): (1) in, The value for the selected balance quality level is expressed in millimeters per second (mm / s); m is the value for the rotor mass, expressed in kilograms (kg). The value of the angular velocity at the maximum operating speed is expressed in radians per second (rad / s); the values ​​of the above parameters can be obtained, therefore the angular velocity of motor spindle 2 can be calculated. .

[0038] Secondly, combining Figure 9 As shown, the rotor assembly is simulated as a planar diagram. Point A is the front bearing end face 201, point B is the rear bearing end face 202, and point CM is the centroid of the rotor assembly. The distance between the front bearing end face 201 and the rear bearing end face 202 is L, and the distance from point A to point CM is [missing information]. The distance from point B to point CM is Therefore, according to formulas (2) and (3), the total allowable residual unbalance value obtained from the front bearing end face 201 can be determined. The total allowable residual unbalance obtained from the end face 202 of the rear bearing : (2) (3) because, L From the above, it can be calculated or obtained through measurement, so it is possible to calculate... Similarly, the specific values, L From the above, it can be calculated or obtained through measurement, so it is possible to calculate... The specific value, It is worth noting that: the above conclusions and The unit is In other words, Alternatively, the mass of the front bearing end face 201 can be multiplied by the distance of the front bearing end face 201 from the center of mass. In this case, given a specific value for the distance of the front bearing end face 201 from the center of mass, the mass of the front bearing end face 201 can be obtained. Similarly, given a specific value for the distance of the rear bearing end face 202 from the center of mass, the mass of the rear bearing end face 202 can be obtained.

[0039] Based on the mass of the front bearing end face 201 and the mass of the rear bearing end face 202 obtained above, dynamic balancing holes are designed to be opened on the front bearing end face 201 and the rear bearing end face 202 (that is, openings are made on the front bearing end face 201 so that the mass is equal to the value calculated above, and the same applies to the rear bearing end face 202), thereby making the entire rotor assembly dynamically balanced.

[0040] It should also be noted that the number and diameter of the dynamic balancing holes can be determined based on the calculated values, allowing for proper opening of the holes on the front bearing end face 201 and the rear bearing end face 202. Furthermore, the positions of the dynamic balancing holes on the front bearing end face 201 and the rear bearing end face 202 do not need to correspond one-to-one.

[0041] In this embodiment, further, combined with Figures 5-8 As shown, the limiting component 3 includes an axial limiting part 301 and a radial limiting part 302; the axial limiting part 301 is used to limit the motor spindle 2 and the rotor core 1 in the circumferential direction to prevent the motor spindle 2 and the rotor core 1 from rotating in the circumferential direction; the radial limiting part 302 is used to limit the motor spindle 2 and the rotor core 1 in the axial direction to prevent the motor spindle 2 and the rotor core 1 from moving in the axial direction.

[0042] Specifically, the axial limiting part 301 includes a first part and a second part, both of which extend along the axial direction of the motor spindle 2 and penetrate the circumferential end face of the outer side of the motor spindle 2; wherein, the first part is formed on the side of the rotor core 1 facing the motor spindle 2, and the second part is formed on the side of the motor spindle 2 facing the rotor core 1.

[0043] Furthermore, the portion of the axial limiting part 301 formed on the rotor core 1 can be inserted into the portion of the axial limiting part 301 formed on the motor core 2 along the axial direction of the motor core 2, or the portion of the axial limiting part 301 formed on the motor core 2 can be inserted into the portion of the axial limiting part 301 formed on the rotor core 1 along the axial direction of the motor core 2, so as to restrict the rotation of the motor core 2 and the rotor core 1 in the circumferential direction.

[0044] Furthermore, the aforementioned axial limiting portions 301 are spaced apart along the circumferential direction. Optionally, two axial limiting portions 301 are provided, such as... Figure 8As shown, there are two keyways 304 in the axial limiting part 301, and the two keyways 304 and the two axial limiting parts are symmetrically arranged about the axial direction of the motor spindle 2.

[0045] Furthermore, the axial limiting part 301 includes a protrusion 303 and a keyway 304 (one of the protrusion 303 and the keyway 304 is a first part, and the other is a second part); the protrusion 303 and the keyway 304 are corresponding in position and adapted to each other in structure. One of the protrusion 303 and the keyway 304 is disposed on the side of the motor spindle 2 facing the rotor core 1, and the other is disposed on the side of the rotor core 1 facing the motor spindle 2; the protrusion 303 is inserted into the keyway 304 along the axial direction of the motor spindle 2 to restrict the rotation of the motor spindle 2 and the rotor core 1 in the circumferential direction.

[0046] Optionally, combined Figure 5 and Figure 6 As shown, the protrusion 303 is provided on the side of the rotor core 1 facing the motor spindle 2, and the keyway 304 is provided on the side of the motor spindle 2 facing the rotor core 1.

[0047] Of course, depending on the actual situation, it is also possible to choose: the protrusion 303 is set on the side of the motor spindle 2 facing the rotor core 1, and the keyway 304 is set on the side of the rotor core 1 facing the motor spindle 2.

[0048] Specifically, radial limiting portions 302 are formed on both sides of the motor spindle 2 along its axial direction, and the radial limiting portions 302 extend along the circumferential direction of the motor spindle 2 and respectively abut against both sides of the rotor core 1 along its axial direction. The radial limiting portions 302 constitute a mechanical constraint to restrict the axial movement of the motor spindle 2 and the rotor core 1.

[0049] Furthermore, combined Figure 3 and Figure 7 As shown, the radial limiting part 302 includes a slot 305 and a retaining ring 306. The motor spindle 2 has slots 305 on both sides of the rotor core 1 along its axial direction, and the slots 305 are annular structures.

[0050] In this design, a portion of the retaining ring 306 is confined within the retaining groove 305 in the radial direction, while another portion protrudes from the retaining groove 305 and fits against the rotor core 1. In other words, the portion protruding from the retaining groove 305 acts as a retainer for the rotor core 1, preventing axial movement of the rotor core 1.

[0051] In summary, in this embodiment, the radial limiting part 302 is used to limit the rotor core 1 in the axial direction, and the axial limiting part 301 can limit the rotation of the motor spindle 2 and the rotor core 1 in the circumferential direction. In this way, when the generator drives the motor spindle 2 to rotate, it can simultaneously drive the rotor assembly to rotate within the stator assembly.

[0052] In this embodiment, combined with Figure 2 And refer to Figure 8 As shown, the motor spindle 2 is provided with first weight-reducing holes 205 extending radially along the motor spindle 2 at intervals along the circumferential direction; optionally, there are 6 first weight-reducing holes 205, and the 6 first weight-reducing holes 205 are arranged at equal intervals along the circumferential direction on the motor spindle 2.

[0053] In addition, the motor spindle 2 is provided with a second weight reduction hole 206 extending in the axial direction of the motor spindle 2.

[0054] As described above, the first weight-reducing hole 205 and the second weight-reducing hole 206, while ensuring the strength of the rotor assembly, further reduce the weight of the rotor assembly, thereby further improving the power density of the generator.

[0055] In this embodiment, combined with Figure 2 As shown, bearing mounting positions 207 for mounting bearings are formed at both ends of the motor spindle 2 along its axial direction and on both sides of the rotor core 1. These mounting positions are areas or points formed on the motor spindle 2 to facilitate the installation of other components.

[0056] In this embodiment, combined with Figure 5 and Figure 6 As shown, the rotor core 1 has third weight-reducing holes 101 spaced apart along its circumferential direction and extending along its axial direction; the cross-section of the third weight-reducing hole 101 can be semi-circular, but is not limited to this shape, and can also be other shapes, such as circular, square, etc.

[0057] In addition, such as Figure 5 As shown, the rotor core 1 is also provided with ventilation holes 102 extending axially along its circumferential direction. These ventilation holes 102 form forced convection channels, effectively reducing the temperature rise of the rotor core 1 and the permanent magnet, and avoiding the risk of demagnetization of the permanent magnet due to high temperatures.

[0058] Example 2 This application also provides a water-cooled generator, including the rotor assembly described above. It thus possesses all the beneficial effects of the rotor assembly, which will not be specifically elaborated upon here.

[0059] Example 3 This application also provides a vehicle including the aforementioned water-cooled generator. Therefore, it possesses all the beneficial effects of a water-cooled generator, which will not be specifically elaborated upon here.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A rotor assembly disposed within a stator assembly; characterized in that, include: The rotor core is disposed within the stator assembly; The motor spindle is inserted into the rotor core via a limiting component and can drive the rotor core to move within the stator assembly to cut magnetic field lines. The motor spindle has a front bearing end face and a rear bearing end face along its axial direction. Both the front bearing end face and the rear bearing end face are provided with dynamic balancing holes to balance the rotor assembly in its axial direction.

2. The rotor assembly according to claim 1, characterized in that, The dynamic balancing hole group on the front bearing end face has a first preset number of dynamic balancing holes, and the first preset number of dynamic balancing holes are arranged at intervals along the circumferential direction of the motor spindle. The dynamic balancing hole group on the rear bearing end face has a second preset number of dynamic balancing holes, and the second preset number of dynamic balancing holes are arranged at intervals along the circumferential direction of the motor spindle. The first preset quantity is equal to the second preset quantity or the first preset quantity is not equal to the second preset quantity.

3. The rotor assembly according to claim 1, characterized in that, The limiting component includes an axial limiting part and a radial limiting part; The axial limiting portion extends along the axial direction of the motor spindle, a portion of which is formed on the side of the rotor core facing the motor spindle, and the remaining portion is formed on the side of the motor spindle facing the rotor core. The portion of the axial limiting part formed on the rotor core can be inserted into the portion of the axial limiting part formed on the motor core shaft along the axial direction of the motor core shaft, or the portion of the axial limiting part formed on the motor core shaft can be inserted into the portion of the axial limiting part formed on the rotor core along the axial direction of the motor core shaft, so as to restrict the rotation of the motor core shaft and the rotor core in the circumferential direction. The radial limiting portion is formed on both sides of the motor spindle along its axial direction, and the radial limiting portion extends along the circumferential direction of the motor spindle and respectively fits against both sides of the rotor core along its axial direction, so as to restrict the axial movement of the motor spindle and the rotor core.

4. The rotor assembly according to claim 3, characterized in that, The axial limiting part includes a protrusion and a keyway; One of the protrusion and the keyway is formed on the side of the motor spindle facing the rotor core, and the other is formed on the side of the rotor core facing the motor spindle. The protrusion is inserted into the keyway along the axial direction of the motor spindle to restrict the rotation of the motor spindle and the rotor core in the circumferential direction.

5. The rotor assembly according to claim 3, characterized in that, The radial limiting part includes a groove and a retaining ring; The motor spindle is provided with slots on both sides of the rotor core along its axial direction. A portion of the retaining ring is confined within the retaining groove in the radial direction, while another portion protrudes from the retaining groove and fits against the rotor core.

6. The rotor assembly according to claim 1, characterized in that, The motor spindle is provided with first weight-reducing holes that extend radially along the motor spindle in the circumferential direction. The motor spindle also has a second weight-reducing hole extending along the axial direction of the motor spindle.

7. The rotor assembly according to claim 1, characterized in that, The motor spindle has bearing mounting positions for mounting bearings at both ends along its axial direction and on both sides of the rotor core.

8. The rotor assembly according to claim 1, characterized in that, The rotor core is provided with third weight-reducing holes spaced apart along its circumferential direction and extending along its axial direction. The rotor core is also provided with ventilation holes that extend along its axial direction at intervals along its circumferential direction.

9. A water-cooled generator, characterized in that, Includes the rotor assembly as described in any one of claims 1-8.

10. A vehicle, characterized in that, Includes the water-cooled generator as described in claim 9.

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