Rotor assembly, rotor assembly and electric machine

Abstract

The utility model discloses a rotor assembly, rotor assembly and motor relates to motor technical field, this rotor assembly includes rotor core, multiple copper bar and two aluminum end ring, has multiple installation cavities on rotor core, and installation cavity extends along the first direction parallel to rotor core axis, and each installation cavity is arranged along the circumferential interval of rotor core. Each copper bar is correspondingly inserted in each installation cavity, and along the first direction, two aluminum end rings are arranged at the both ends of rotor core respectively, and are connected with the similar rotor core end portion and copper bar end portion through casting respectively. According to the rotor assembly provided by the utility model, the copper bar can guarantee higher energy efficiency and is not easy to break, and the aluminum end ring is connected with the rotor core and the copper bar by casting to form, instead of welding, which simplifies the manufacturing process, reduces the amount of copper and solder, and greatly reduces the manufacturing cost of the motor.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically a rotor assembly, rotor assembly and motor. Background Technology

[0002] As a rotary drive component, the electric motor is widely used in various equipment. It mainly consists of two parts: the rotor and the stator. Among them, the rotor is one of the key components of the motor, which plays the role of transmitting electrical energy and rotating. For example, the rotor of a squirrel-cage motor is composed of an iron core made of multiple stacked silicon steel sheets, and the iron core also has multiple guide bars and two end rings.

[0003] However, the guide bars in the rotors used in motors in related technologies are made of cast aluminum, which is prone to breakage, affecting the quality of the motor. In addition, the guide bars in some rotors are fixed to the end rings by welding, which makes the manufacturing process relatively complicated. Utility Model Content

[0004] The purpose of this invention is to provide a rotor assembly, rotor assembly, and motor to solve at least one aspect of the problems and defects mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: In a first aspect, this utility model provides a rotor assembly, comprising: The rotor core has multiple mounting cavities extending along a first direction parallel to the rotor core axis, and the mounting cavities are arranged at intervals along the circumference of the rotor core. Multiple copper guide bars are inserted into each mounting cavity accordingly; Two aluminum end rings are respectively disposed at both ends of the rotor core along the first direction, and are respectively connected to the adjacent rotor core ends and copper conductor bar ends by casting.

[0006] As a further embodiment of this utility model: along the first direction, at least one side of the copper guide bar is provided with a recess and / or a protrusion, and the aluminum end ring covers the adjacent recess and / or protrusion.

[0007] As a further improvement of this utility model: the rotor core also has multiple heat dissipation channels, which extend from the axis of the rotor core to the outer periphery of the rotor core. Each heat dissipation channel is arranged at intervals along the circumference and / or the first direction of the rotor core.

[0008] As a further embodiment of this utility model: the rotor core includes rotor laminations and ventilation slot plates. The rotor laminations have multiple first slots, which are arranged at intervals along the circumference of the rotor laminations. The ventilation slot plates have multiple second slots, which are arranged at intervals along the circumference of the rotor laminations. The heat dissipation channels are located on the ventilation slot plates. Multiple rotor laminations are stacked along a first direction. A ventilation slot plate is inserted every few rotor laminations, and the first slots on adjacent rotor laminations are connected to each other. The first slots on adjacent rotor laminations and the second slots on the ventilation slot plate are connected to each other to form each mounting cavity.

[0009] As a further embodiment of this utility model: the ventilation slot plate includes two slot plate bodies and multiple stiffeners. The two slot plate bodies are arranged in parallel, and each second slot is located on each slot plate body and is arranged at intervals along the circumference of each slot plate body. Each stiffener is connected between two slot plate bodies and arranged in a ring array around the axis of the slot plate body. Adjacent stiffeners and the two slot plate bodies enclose each other to form a heat dissipation channel.

[0010] As a further embodiment of the present invention: the end of the stiffener facing the inner side of the groove plate body has at least one bent section, and the bent section bends to one side in a plane perpendicular to the first direction.

[0011] As a further embodiment of this utility model: one of the stiffening plate and the adjacent groove plate body is provided with a positioning protrusion, and the other is provided with a positioning groove that matches the positioning protrusion, and the positioning protrusion and the positioning groove are connected accordingly.

[0012] As a further embodiment of this utility model: the rotor core also includes two rotor end plates, each rotor end plate having a plurality of third slots, the third slots being arranged at intervals along the circumference of the rotor end plates. Along the first direction, the two rotor end plates abut against the outer sides of the rotor laminations at both ends, and make the first slot on the adjacent rotor lamination and the third slot on the rotor end plate correspondingly connected. Along the first direction, the two sides of the copper guide bar are respectively inserted into the corresponding third slot, and the aluminum end ring is connected to the adjacent rotor end plate and the end of the copper guide bar by casting.

[0013] Secondly, the present invention also provides a rotor assembly, including any of the rotor components provided in the first aspect.

[0014] Thirdly, this utility model also provides an electric motor, including the rotor assembly provided in the second aspect.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: the rotor assembly includes a rotor core, multiple copper conductor bars, and two aluminum end rings. By setting multiple mounting cavities on the rotor core, the mounting cavities extend along a first direction parallel to the rotor core axis, and each mounting cavity is arranged circumferentially around the rotor core for mounting copper conductor bars. By correspondingly inserting each copper conductor bar into each mounting cavity, high energy efficiency and resistance to breakage are ensured. Along the first direction, the two aluminum end rings are respectively set at both ends of the rotor core, and are respectively cast to connect the adjacent rotor core ends and copper conductor bar ends. The aluminum end rings are cast to connect and form with the rotor core and copper conductor bars, replacing welding, simplifying the manufacturing process, reducing the amount of copper and solder used, and significantly reducing the manufacturing cost of the motor. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 A schematic diagram of the rotor assembly provided by this utility model; Figure 2 for Figure 1 A sectional view along section AA; Figure 3 for Figure 1 Schematic diagram of the structure of the copper conductor bar; Figure 4 for Figure 1 Schematic diagram of the structure of the rotor lamination; Figure 5 for Figure 1 Exploded view of the central ventilation duct plate; Figure 6 for Figure 1 Schematic diagram of the rotor end plate; Figure 7 for Figure 1 A schematic diagram of the structure of the aluminum end ring.

[0018] Figure label: 100. Rotor core; 101. Mounting cavity; 102. Heat dissipation channel; 110. Rotor lamination; 111. First slot; 120. Ventilation slot plate; 1201. Second slot; 121. Slot plate body; 1211. Positioning groove; 122. Rib plate; 1221. Bending section; 1222. Positioning protrusion; 130. Rotor end plate; 131. Third slot; 200. Copper conductor bar; 201. Recessed portion; 300, aluminum end ring. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] Firstly, please refer to Figures 1 to 7 As shown, this embodiment of the present invention provides a rotor assembly, including: The rotor core 100 has a plurality of mounting cavities 101 extending along a first direction parallel to the axis of the rotor core 100, and the mounting cavities 101 are arranged at circumferential intervals along the rotor core 100.

[0026] Multiple copper guide bars 200 are inserted into each mounting cavity 101.

[0027] Two aluminum end rings 300 are respectively disposed at both ends of the rotor core 100 along the first direction, and are respectively connected to the ends of the rotor core 100 and the copper guide bar 200 by casting.

[0028] In this embodiment, the rotor core 100 can be formed by stacking and pressing together several silicon steel sheets, resulting in a hollow cylindrical shape. Multiple mounting cavities 101 are evenly distributed in a circular direction on the rotor core 100. These mounting cavities 101 are for mounting the copper conductor bars 200. Each mounting cavity 101 is a long slot, its length direction arranged along a first direction parallel to the axis of the rotor core 100. Figure 1 As shown in the X-axis direction, the groove of the mounting cavity 101 can be rectangular, teardrop-shaped, etc.

[0029] In this embodiment, the copper conductor 200 matches the mounting cavity 101. The copper conductor 200 can be inserted into the corresponding mounting cavity 101 along the first direction, and both ends of the copper conductor 200 extend outside the mounting cavity 101, i.e., a portion is exposed. The surface of the copper conductor 200 has an insulating layer to ensure that the copper conductor 200 and the mounting cavity 101 are in an insulating state when the copper conductor 200 is inserted into the mounting cavity 101. It is worth noting that the conductor is made of copper, which ensures both high energy efficiency and resistance to breakage.

[0030] In this embodiment, the aluminum end ring 300 serves two purposes: firstly, it connects the ends of each copper conductor bar 200 to form a squirrel cage; secondly, it fixes the rotor core 100 and the copper conductor bars 200. Specifically, after installing each copper conductor bar 200, the two ends of the rotor core 100 and the copper conductor bars 200 are placed in a mold, and molten aluminum is poured in to form the final shape. It is worth noting that using a cast aluminum end ring 300 to connect and form the rotor core 100 and the copper conductor bars 200, instead of welding, simplifies the manufacturing process and reduces the amount of copper and solder used, significantly reducing the manufacturing cost of the motor. Furthermore, as... Figure 7 As shown, multiple heat dissipation fins can also be provided on the end of the aluminum end ring 300 that is away from the rotor core 100 to enhance heat dissipation.

[0031] Therefore, the application of the rotor assembly provided in this embodiment of the present invention, by using copper conductor bars, can ensure high energy efficiency and is not easy to break. Moreover, by using cast aluminum end rings 300 to connect and form with rotor core 100 and copper conductor bars 200, instead of welding, the manufacturing process is simplified and the amount of copper and solder used is reduced, which can significantly reduce the manufacturing cost of the motor.

[0032] In some embodiments, along a first direction, the copper guide bar 200 has a recess 201 and / or a protrusion on at least one side, and the aluminum end ring 300 covers the adjacent recess 201 and / or protrusion.

[0033] In some examples, such as Figure 3 As shown, the copper guide bar 200 has recesses 201 at both ends. Further, the recesses 201 are through holes and / or grooves. In this way, when casting the aluminum end ring 300, some of the molten aluminum fills into the recesses 201, thereby increasing the bonding force between the aluminum end ring 300 and the copper guide bar 200, making it less prone to loosening or separation.

[0034] In other examples, not shown in the figure, various protrusions can be provided at both ends of the copper guide strip 200. In this way, when casting the aluminum end ring 300, some of the molten aluminum can connect with the protrusions to form a hook or latch structure, which can also increase the bonding force between the aluminum end ring 300 and the copper guide strip 200, making it less prone to loosening or detachment.

[0035] The specific shape, number, and location of the recessed portion 201 or the protrusion can be determined according to actual needs, and no excessive restrictions are imposed in this embodiment.

[0036] Furthermore, in this embodiment, the rotor core 100 also has a plurality of heat dissipation channels 102, which extend from the axis of the rotor core 100 to the outer periphery of the rotor core 100.

[0037] Each heat dissipation channel 102 is arranged at intervals along the circumference and / or first direction of the rotor core 100.

[0038] Specifically, such as Figure 2 , Figure 5 As shown, the rotor core 100 has multiple heat dissipation channels 102 arranged approximately radially. These channels can be evenly distributed circumferentially along the rotor core 100 or evenly distributed along a first direction. This allows heat to be dissipated from the inside of the rotor core 100 to the outer periphery, preventing high temperatures from affecting its performance. The specific shape and number of the heat dissipation channels 102 can be determined according to actual needs, and this embodiment does not impose excessive restrictions.

[0039] In some embodiments, the rotor core 100 includes rotor laminations 110 and ventilation slots 120. The rotor laminations 110 have a plurality of first slots 111, which are spaced apart circumferentially along the rotor laminations 110. The ventilation slots 120 have a plurality of second slots 1201, which are spaced apart circumferentially along the rotor laminations 110. A heat dissipation channel 102 is located on the ventilation slots 120.

[0040] Multiple rotor laminations 110 are stacked along a first direction. A ventilation slot plate 120 is inserted every few rotor laminations 110, and the first slots 111 on adjacent rotor laminations 110 are connected to each other. The first slots 111 on adjacent rotor laminations 110 and the second slots 1201 on the ventilation slot plate 120 are connected to each other to form each mounting cavity 101.

[0041] Specifically, such as Figure 4 As shown, the rotor lamination 110, also known as a silicon steel sheet, is formed by stamping and has a ring-shaped thin sheet structure. Multiple first slots 111 are evenly distributed circumferentially on the rotor lamination 110, and these first slots 111 match the copper conductor bars 200. Furthermore, as... Figure 5 As shown, the ventilation slot plate 120 can also be a ring-shaped sheet structure, with multiple first slots 111 evenly distributed around its circumference. The first slots 111 match the copper conductors 200. The heat dissipation channels 102 are located on the ventilation slot plate 120 and can be evenly distributed around the circumference of the ventilation slot plate 120.

[0042] Along the first direction, multiple rotor laminations 110 are stacked, and a ventilation slot plate 120 is inserted every few rotor laminations 110. The first slots 111 and the second slots 1201 on the same straight line are connected to form a mounting cavity 101 for inserting copper guide bars 200.

[0043] Furthermore, in this embodiment, the ventilation slot plate 120 includes two slot plate bodies 121 and a plurality of stiffening plates 122. The two slot plate bodies 121 are arranged in parallel, and each second slot hole 1201 is located on each slot plate body 121 and is arranged at intervals along the circumference of each slot plate body 121.

[0044] Each stiffener 122 is connected between two slot plate bodies 121 and arranged in a ring array around the axis of the slot plate body 121. Adjacent stiffeners 122 and the two slot plate bodies 121 enclose each other to form a heat dissipation channel 102.

[0045] Specifically, such as Figure 5 As shown, the groove plate body 121 can be an annular sheet structure, which can be formed by stamping. The two groove plate bodies 121 are coaxial and arranged in parallel, and the second groove holes 1201 are evenly distributed in the circumferential direction on the two groove plate bodies 121.

[0046] The stiffener 122 can be plate-shaped or sheet-shaped and is located between two slot plate bodies 121. The two sides of the stiffener 122 can be fixedly connected to the adjacent slot plate bodies 121 by welding, snap-fit, or other methods. Moreover, the stiffeners 122 are arranged in a ring array around the axis of the slot plate body 121 so that adjacent stiffeners 122 and the two slot plate bodies 121 enclose a heat dissipation channel 102. This facilitates manufacturing, processing, and assembly. The specific shape and number of stiffeners 122 can be determined according to actual needs, and no excessive restrictions are imposed in this embodiment.

[0047] Furthermore, in this embodiment, the end of the stiffener 122 facing the inner side of the groove plate body 121 has at least one bent section 1221, and the bent section 1221 bends to one side in a plane perpendicular to the first direction.

[0048] Specifically, such as Figure 5 As shown, the stiffening rib 122 has two bent sections 1221 at one end facing the axis of the groove plate body 121. The bent sections 1221 are bent to one side in a plane perpendicular to the first direction. In this way, the supporting strength of the stiffening rib 122 can be increased, and the stiffening rib 122 is not easy to collapse or be crushed when it is under pressure.

[0049] The number of bending segments 1221 can be set to more or fewer, and this embodiment does not impose too many restrictions on this.

[0050] Furthermore, in this embodiment, one of the stiffening plate 122 and the adjacent groove plate body 121 is provided with a positioning protrusion 1222, and the other is provided with a positioning groove 1211 that matches the positioning protrusion 1222. The positioning protrusion 1222 and the positioning groove 1211 are connected accordingly.

[0051] For example, such as Figure 5 As shown, a positioning groove 1211 is provided on one of the groove plate bodies 121. The positioning groove 1211 can be provided both radially and circumferentially along the groove plate body 121. A positioning protrusion 1222 is provided on the side of the rib plate 122 facing the positioning groove 1211. The positioning protrusion 1222 is correspondingly positioned and connected to the positioning groove 1211.

[0052] In this way, when assembling each stiffener 122 with the two slotted plate bodies 121, both assembly accuracy and post-weld strength can be guaranteed. Of course, the positioning protrusion 1222 can also be located on the slotted plate body 121, and correspondingly, the positioning groove 1211 can be located on the stiffener 122 to achieve positioning. It can be determined according to actual needs, and no excessive restrictions are imposed in this embodiment.

[0053] In some embodiments, the rotor core 100 further includes two rotor end plates 130, each rotor end plate 130 having a plurality of third slots 131 arranged at circumferential intervals along the rotor end plate 130.

[0054] Along the first direction, the two rotor end plates 130 respectively abut against the outer side of the rotor laminations 110 at both ends, and make the first slot 111 on the adjacent rotor laminations 110 and the third slot 131 on the rotor end plate 130 correspondingly connected.

[0055] Along the first direction, the two sides of the copper guide bar 200 are respectively inserted into the corresponding third slot 131, and the aluminum end ring 300 is connected to the adjacent rotor end plate 130 and the end of the copper guide bar 200 by casting.

[0056] Specifically, such as Figure 6 As shown, the rotor end plate 130 is used to strengthen the rotor laminations 110 at both ends. The thickness of the rotor end plate 130 is greater than the thickness of the rotor laminations 110. Multiple third slots 131 are opened on the rotor end plate 130, and each third slot 131 is evenly distributed along the circumference of the rotor end plate 130.

[0057] In this design, after the two rotor end plates 130 abut against the outer sides of the rotor laminations 110 at both ends, the first slot 111 and the third slot 131 are connected to each other to allow the ends of the copper guide bars 200 to pass through. Furthermore, after the copper guide bars 200 are installed into the mounting cavities 101 on the rotor core 100 and the two rotor end plates 130 are installed, aluminum end rings 300 are cast at both ends. That is, the aluminum end rings 300 are cast to connect the adjacent rotor end plates 130 and the ends of the copper guide bars 200, replacing the welding connection between the guide bars and the end rings, simplifying the manufacturing process and reducing costs.

[0058] Secondly, this utility model embodiment also provides a rotor assembly, including the rotor component of any of the above embodiments.

[0059] Specifically, the rotor assembly may also include a shaft, with a shaft hole provided along the axial direction of the rotor core 100. The shaft is inserted into the shaft hole and connected by a key to form the rotor assembly. Of course, the rotor assembly may also include other components, such as bearings, depending on actual needs. This embodiment does not impose too many restrictions.

[0060] Therefore, the rotor assembly provided in this embodiment of the present invention, by configuring a rotor component, which uses copper conductor bars, can ensure high energy efficiency and is not easy to break. Moreover, by using a cast aluminum end ring 300 to connect and form with the rotor core 100 and copper conductor bars 200, instead of welding, the manufacturing process is simplified and the amount of copper and solder used is reduced, which can significantly reduce the manufacturing cost of the motor.

[0061] Thirdly, this utility model embodiment also provides a motor, including the rotor assembly of any of the above embodiments.

[0062] Specifically, the motor may also include components such as a housing and a stator. The stator is housed within the housing, and the rotor assembly is rotatably mounted within the stator, thus forming the complete motor. Of course, the motor may also include other components, depending on actual needs; this embodiment does not impose excessive restrictions.

[0063] Therefore, the motor provided in this embodiment of the present invention, by configuring a rotor assembly including a rotor component, which uses copper conductor bars, can ensure high energy efficiency and is not easy to break. Moreover, by using a cast aluminum end ring 300 to connect and form with the rotor core 100 and copper conductor bars 200, instead of welding, the manufacturing process is simplified and the amount of copper and solder used is reduced, which can significantly reduce the manufacturing cost of the motor.

[0064] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A rotor assembly, characterized in that, include: The rotor core (100) has a plurality of mounting cavities (101) extending along a first direction parallel to the axis of the rotor core (100), and the mounting cavities (101) are arranged at circumferential intervals along the rotor core (100). Multiple copper guide strips (200) are inserted into each of the mounting cavities (101); Two aluminum end rings (300) are respectively disposed at both ends of the rotor core (100) along the first direction, and are respectively connected to the adjacent ends of the rotor core (100) and the ends of the copper guide bars (200) by casting.

2. The rotor assembly according to claim 1, characterized in that, Along the first direction, the copper guide bar (200) has a recess (201) and / or a protrusion on at least one side, and the aluminum end ring (300) covers the adjacent recess (201) and / or the protrusion.

3. The rotor assembly according to claim 2, characterized in that, The rotor core (100) also has a plurality of heat dissipation channels (102), which extend from the axis of the rotor core (100) to the outer periphery of the rotor core (100); Each of the heat dissipation channels (102) is arranged at intervals along the circumference and / or the first direction of the rotor core (100).

4. The rotor assembly according to claim 3, characterized in that, The rotor core (100) includes rotor laminations (110) and ventilation slots (120). The rotor laminations (110) have a plurality of first slots (111), and each of the first slots (111) is arranged at intervals along the circumference of the rotor laminations (110). The ventilation slots (120) have a plurality of second slots (1201), and each of the second slots (1201) is arranged at intervals along the circumference of the rotor laminations (110). The heat dissipation channel (102) is located on the ventilation slots (120). Multiple rotor laminations (110) are stacked along the first direction, and a ventilation slot plate (120) is inserted every few rotor laminations (110). The first slots (111) on adjacent rotor laminations (110) are connected, and the first slots (111) on adjacent rotor laminations (110) and the second slots (1201) on the ventilation slot plate (120) are connected to form each mounting cavity (101).

5. The rotor assembly according to claim 4, characterized in that, The ventilation slot plate (120) includes two slot plate bodies (121) and multiple stiffeners (122). The two slot plate bodies (121) are arranged in parallel, and each second slot hole (1201) is located on each slot plate body (121) and is arranged at intervals along the circumference of each slot plate body (121). Each of the stiffeners (122) is connected between the two slot plate bodies (121) and arranged in a ring array around the axis of the slot plate body (121). The adjacent stiffeners (122) and the two slot plate bodies (121) enclose each other to form the heat dissipation channel (102).

6. The rotor assembly according to claim 5, characterized in that, The stiffener (122) has at least one bent section (1221) at one end facing the inside of the groove plate body (121), and the bent section (1221) bends to one side in a plane perpendicular to the first direction.

7. The rotor assembly according to claim 5, characterized in that, One of the stiffening plate (122) and the adjacent groove plate body (121) is provided with a positioning protrusion (1222), and the other is provided with a positioning groove (1211) that matches the positioning protrusion (1222). The positioning protrusion (1222) and the positioning groove (1211) are connected accordingly.

8. The rotor assembly according to any one of claims 4 to 7, characterized in that, The rotor core (100) also includes two rotor end plates (130), each rotor end plate (130) having a plurality of third slots (131), each third slot (131) being arranged at circumferential intervals along the rotor end plate (130). Along the first direction, the two rotor end plates (130) respectively abut against the outer side of the rotor laminations (110) at both ends, and make the first slot (111) on the adjacent rotor laminations (110) and the third slot (131) on the rotor end plate (130) correspondingly connected; Along the first direction, the two sides of the copper guide bar (200) are respectively inserted into the corresponding third slot (131), and the aluminum end ring (300) is connected to the rotor end plate (130) and the end of the copper guide bar (200) by casting.

9. A rotor assembly, characterized in that, Includes the rotor assembly as described in any one of claims 1 to 8.

10. An electric motor, characterized in that, Includes the rotor assembly as described in claim 9.

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