Rotor assembly, motor, vehicle and manufacturing method of rotor assembly

Abstract

The invention relates to a rotor assembly, a motor, a vehicle and a manufacturing method of the rotor assembly, and belongs to the technical field of new energy automobiles. The rotor assembly comprises a rotating shaft, a plurality of rotor cores, a plurality of magnetic steels and an integrated glue injection structure, the plurality of rotor cores are sequentially sleeved on the rotating shaft, each rotor core is provided with a plurality of magnetic steel grooves, the magnetic steels are installed in the corresponding magnetic steel grooves, and a gap is arranged between each magnetic steel and the groove wall of the corresponding magnetic steel groove. The holes of every two adjacent sections of rotor iron cores are in one-to-one correspondence, the corresponding holes are communicated with each other to form glue channels, the integrated glue injection structure comprises a plurality of bonding parts and two end face parts, the bonding parts are filled in the corresponding glue channels, and the two end face parts are communicated with the bonding parts. And the two end face parts respectively surround the rotating shaft, are arranged on the end faces, deviating from each other, of the two sections of rotor iron cores at the two ends of the rotor assembly, and are respectively connected with the two ends of each bonding part. According to the invention, the fixing process of the magnetic steel can be simplified, and the performance and quality of the motor rotor are not affected.

Description

Technical Field

[0001] The present disclosure relates to the technical field of new energy vehicles, and in particular to a rotor assembly, a motor, a vehicle, and a method for manufacturing the rotor assembly. Background Art

[0002] The motor can convert the electrical energy of the power source into mechanical energy and is an important component for providing power for new energy electric vehicles. At present, the magnets of the motor rotor are mostly filled with the gaps between the magnet slots and the magnets through injection molding or glue injection to fix the magnets. After that, the excess material above the surface of the rotor core in the gaps between each magnet slot and the magnet needs to be removed separately. This method is not only complicated in process, but also has the problem of difficult to ensure cleanliness, which is easy to affect the performance and quality of the motor rotor. Summary of the invention

[0003] In view of this, the embodiments of the present disclosure provide a rotor assembly, a motor, a vehicle and a method for manufacturing a rotor assembly, which can simplify the fixing process of the magnetic steel and will not affect the performance and quality of the motor rotor. The technical solution is as follows:

[0004] In a first aspect, a rotor assembly is provided, the rotor assembly comprising a rotating shaft, a multi-section rotor core, a plurality of magnetic steels and an integrated glue injection structure;

[0005] The multiple sections of the rotor core are sequentially sleeved on the rotating shaft, each section of the rotor core has a plurality of magnetic steel slots, the plurality of magnetic steel slots are evenly distributed around the axis of the rotating shaft, and the magnetic steel slots penetrate the corresponding rotor core along the axial direction of the rotating shaft;

[0006] The magnetic steels correspond to the magnetic steel slots one by one and are installed in the corresponding magnetic steel slots. A gap is provided between each magnetic steel and the slot wall of the corresponding magnetic steel slot. The gap penetrates the rotor core along the axial direction of the rotating shaft. The gaps of each adjacent section of the rotor core correspond to each other, and the corresponding gaps are connected to each other to form a rubber channel.

[0007] The integrated glue injection structure includes multiple bonding parts and two end face parts. The bonding parts correspond to the glue channels one by one and are filled in the corresponding glue channels. The two end face parts are respectively arranged around the rotating shaft on the end faces of the two sections of the rotor core located at the two ends of the rotor assembly that are away from each other, and are respectively connected to the two ends of each bonding part.

[0008] In a possible implementation, the rotor assembly also includes two pressure rings, which are fixedly mounted on the rotating shaft and respectively abut against end surfaces of two sections of the rotor core located at two ends of the rotor assembly that are facing away from each other, and the two end surface portions respectively surround the corresponding pressure rings.

[0009] In a possible implementation, the diameter of the outer edge of the end face portion is configured such that the end face portion covers the corresponding outer circumference of the rotor core end face.

[0010] In a possible implementation, the inner edge profile of the end surface portion is configured such that the end surface portion also covers each of the magnetic steels.

[0011] In a possible implementation, each section of the rotor core has a plurality of through holes, and the plurality of through holes penetrate the corresponding rotor core along the axial direction of the rotating shaft and are evenly distributed around the axis of the rotating shaft. The through holes of each adjacent section of the rotor core correspond to each other, and the corresponding through holes are connected to each other to form a weight-reducing hole, and the outer diameter of the pressure ring is smaller than the maximum distance between the weight-reducing hole and the axis of the rotating shaft.

[0012] In a possible implementation, the outer diameter of the pressure ring is smaller than the minimum distance between the magnetic steel and the axis of the rotating shaft.

[0013] In a possible implementation, each adjacent section of the rotor core is rotated by a certain angle around the axis of the rotating shaft, so that the pores of each adjacent section of the rotor core overlap along the axial portion of the rotating shaft.

[0014] In a second aspect, a motor is provided, comprising a rotor assembly as described in any one of the first aspects.

[0015] In a third aspect, a vehicle is provided, comprising the motor as described in the second aspect.

[0016] In a fourth aspect, a method for manufacturing a rotor assembly is provided, wherein the method for manufacturing a rotor assembly is used to manufacture the rotor assembly as described in any one of the first aspects, and comprises:

[0017] Inserting each of the magnetic steels into the magnetic steel slot corresponding to the rotor core;

[0018] Assembling each of the rotor cores with the magnetic steel into the glue injection tooling mold in sequence;

[0019] Injecting glue into the glue injection tooling mold to form the integrated glue injection structure, so that the integrated glue injection structure, the magnetic steel and the rotor core form a rotor core assembly, and taking out the rotor core assembly from the glue injection tooling mold;

[0020] The rotor core assembly is assembled on the rotating shaft.

[0021] In the scheme disclosed in the present invention, the corresponding pores in the adjacent rotor cores in the rotor assembly are connected to form a glue path, so that each bonding portion filled in the glue path is continuous. The end face portion of the integrated glue injection structure is arranged on the two sections of the rotor core located at the two ends of the rotor assembly, which are opposite to each other, and are respectively connected to the two ends of each bonding portion through the two end face portions, so that the two end face portions are connected to each bonding portion. Therefore, the integrated glue injection structure can be formed in one step by means of integrated glue injection, and the fixing of the magnetic steel on the rotor core can be completed in one step, and after forming, there is no need to clean the excess material on the surface of the rotor core. Therefore, on the one hand, it can simplify the fixing process of the magnetic steel, and on the other hand, it will not affect the performance and quality of the motor rotor.

[0022] The manufacturing method of the rotor assembly can form an integrated glue injection structure in one step, fix the magnetic steel on the rotor core in one step, and after forming, there is no need to clean the excess material on the surface of the rotor core. At the same time, the rotor core assembly can be quickly assembled on the rotating shaft, thereby realizing efficient manufacturing of the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 is a structural schematic diagram of a rotor assembly provided by an embodiment of the present disclosure;

[0025] Figure 2 It is a structural schematic diagram of a rotor assembly provided by an embodiment of the present disclosure, in which a rotating shaft and an integrated glue injection structure are removed;

[0026] Figure 3 It is a structural schematic diagram of an integrated glue injection structure provided by an embodiment of the present disclosure;

[0027] Figure 4 is a structural schematic diagram of a rotor assembly provided by an embodiment of the present disclosure;

[0028] Figure 5 It is a structural schematic diagram of the positional relationship between a rotor core assembly and a pressing ring provided in an embodiment of the present disclosure;

[0029] Figure 6 It is a schematic diagram of a top view structure of a rotor assembly provided in an embodiment of the present disclosure.

[0030] Description of Reference Numerals

[0031] 1. Rotating shaft; 2. Rotor core; 21. Magnetic steel slot; 211. Pores; 22. Weight reduction holes; 3. Magnetic steel; 4. Integrated glue injection structure; 41. Adhesive part; 42. End face part; 5. Pressing ring; 6. Shaft shoulder.

[0032] 20. Rotor core assembly.

[0033] 101. First step; 102. Second step; 103. Third step; 104. Fourth step. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0035] This embodiment relates to a rotor assembly, such as Figure 1 The figure shows the schematic diagram of the structure of the rotor assembly. Figure 2 The figure shows the schematic diagram of the rotor assembly without the rotating shaft and the integral injection structure. Figure 3 The figure shows the structural diagram of the integrated injection structure. Figure 4 The figure shows the schematic diagram of the structure of the rotor assembly. Figure 5 The figure shows the structural diagram of the position relationship between the rotor core assembly and the pressure ring. Figure 6 The figure shows a schematic diagram of the top view of a rotor assembly.

[0036] refer to Figure 1 Combined with Figure 2 and Figure 3 As shown, the rotor assembly includes a rotating shaft 1, a multi-section rotor core 2, a plurality of magnetic steels 3 and an integral injection structure 4. For example, the rotor core 2 can be as follows Figure 1 As shown, it includes four segments, six segments, eight segments, etc. In this embodiment, as shown in FIG. Figure 1 The rotor core 2 shown in the figure includes four sections for example, and the four sections of the rotor core 2 are sequentially sleeved on the rotating shaft 1.

[0037] Each section of the rotor core 2 has a plurality of magnetic steel slots 21, and the plurality of magnetic steel slots 21 are evenly distributed around the axis of the rotating shaft 1, and the magnetic steel slots 21 penetrate the corresponding rotor core 2 along the axial direction of the rotating shaft 1. For example, the magnetic steel slots 21 may include ten, twelve, or more. Figure 2 The magnetic steel slots 21 can be arranged in pairs in an eight-shaped pattern, or as shown in FIG. Figure 2 As shown in FIG. 1 , a V-shaped arrangement is provided. Figure 2 The magnetic steel slots 21 shown include sixteen, and are arranged in groups of two in a V-shape as an example.

[0038] Continue to refer Figure 2As shown, the magnetic steels 3 correspond to the magnetic steel slots 21 one by one and are installed in the corresponding magnetic steel slots 21 . There is a gap 211 between each magnetic steel 3 and the slot wall of the corresponding magnetic steel slot 21 .

[0039] For example Figure 2 As shown, each magnetic steel slot 21 may have two pores 211, and the two pores 211 may be located on opposite sides of the corresponding magnetic steel 3. The pores 211 penetrate the rotor core 2 along the axial direction of the rotating shaft 1, and the pores 211 of each adjacent section of the rotor core 2 correspond to each other, and the corresponding pores 211 are connected to each other to form a rubber channel.

[0040] refer to Figure 3 Combined with Figure 2 As shown, the integrated glue injection structure 4 includes a plurality of adhesive portions 41 and two end face portions 42. The adhesive portions 41 correspond to the glue channels one by one and are filled in the corresponding glue channels. Figure 2 and Figure 3 As shown, the number of adhesive paths may be thirty-two, and accordingly, the number of adhesive portions 41 may also be thirty-two; however, the number of adhesive paths may also be twenty-four, and accordingly, the number of adhesive portions 41 may also be twenty-four.

[0041] The two end surface portions 42 are respectively arranged around the rotating shaft 1 on the end surfaces of two sections of the rotor core 2 located at two ends of the rotor assembly that are away from each other, and are respectively connected to the two ends of each bonding portion 41 .

[0042] As can be seen from the above, the corresponding pores 211 in the adjacent rotor cores 2 are connected to form a glue path, so that each bonding portion 41 filled in the glue path is continuous. The end surface 42 of the integrated glue injection structure 4 is arranged on the end surfaces of the two sections of the rotor core 2 located at the two ends of the rotor assembly that are away from each other, and the two end surface portions 42 are respectively connected to the two ends of each bonding portion 41, so that the two end surface portions 42 are connected to each bonding portion 41.

[0043] Therefore, the integrated glue injection structure 4 can be formed in one step by means of integrated glue injection, and the magnetic steel 3 can be fixed on the rotor core 2 in one step. After forming, there is no need to clean the excess material on the surface of the rotor core 2. Therefore, on the one hand, the fixing process of the magnetic steel 3 can be simplified, and on the other hand, the performance and quality of the rotor assembly will not be affected.

[0044] In one example, reference Figure 1 As shown, the rotor assembly also includes two pressing rings 5, which are fixedly mounted on the rotating shaft 1 and respectively abut against the end faces of two sections of the rotor core 2 located at both ends of the rotor assembly that are away from each other, and the two end surface portions 42 respectively surround the corresponding pressing rings 5.

[0045] In this way, on the one hand, the two pressing rings 5 ​​can play a role in axially limiting the rotor core 2 on the rotating shaft 1, and on the other hand, the end surface portion 42 will not interfere with the pressing ring 5, thereby avoiding affecting the performance and quality of the rotor assembly.

[0046] In one example, due to factors such as uneven material, process error, uneven deformation of rotor blades, uneven wear or local block loss, there is always imbalance on the rotor. Imbalance can cause vibration of the rotor, accelerate the wear of components such as bearings and shaft seals, and reduce the service life and efficiency of the machine. Accordingly, the pressure ring 5 is configured to have a deweighting hole, so as to change the mass distribution of the rotor, reduce the rotor vibration caused by the eccentric centrifugal force of the center of mass or the dynamic load acting on the bearing to within the allowable range, and thus achieve the purpose of stable operation of the engine.

[0047] In one example, the pressing ring 5 can be made of aluminum alloy, stainless steel, or steel. Compared with aluminum alloy and stainless steel, the steel pressing ring 5 can reduce costs.

[0048] In a preferred example, the pressing ring 5 is made of steel. Compared with aluminum alloy, the steel pressing ring 5 has a higher density, so it can achieve the purpose of changing the mass distribution of the rotor with fewer de-weighting holes. On the one hand, it can reduce the workload of opening de-weighting holes, and on the other hand, fewer de-weighting holes are conducive to improving the NVH (Noise, Vibration, Harshness) performance of the rotor.

[0049] The rotor core 2 of the rotor assembly is made of stacked silicon steel sheets. Therefore, the two ends of the rotor in the prior art mostly have larger dynamic balancing plates. The dynamic balancing plates are used to press down the edges of the silicon steel sheets of the rotor core 2 to prevent warping problems. However, larger dynamic balancing plates have the problem of higher costs.

[0050] Therefore, in one example, reference Figure 4 and Figure 5 As shown, the diameter of the outer edge of the end surface portion 42 is configured so that the end surface portion 42 covers the outer circumference of the corresponding end surface of the rotor core 2 .

[0051] For example, the diameter of the outer edge of the end face portion 42 is consistent with the diameter of the rotor core 2, or the diameter of the outer edge of the end face portion 42 is slightly smaller than the diameter of the rotor core 2. The diameter of the rotor core 2 can be 60 mm, and the diameter of the outer edge of the end face portion 42 can be 60 mm or 59 mm; the diameter of the rotor core 2 can be 70 mm, and the diameter of the outer edge of the end face portion 42 can be 70 mm or 69 mm.

[0052] In this way, since the end surface portion 42 of the integrated glue injection structure 4 covers the outer periphery of the corresponding end surface of the rotor core 2 and is connected to the bonding portion 41 as a whole, it can play a role in pressing the silicon steel sheets on the end surfaces of the two sections of the rotor core 2 located at both ends of the rotor assembly that are facing away from each other, thereby avoiding the risk of warping of the rotor core 2, which is beneficial to improving the performance and quality of the rotor assembly.

[0053] In one example, continue to refer to Figure 4 and Figure 5 As shown, the inner edge profile of the end surface portion 42 is configured so that the end surface portion 42 also covers each magnetic steel 3. Figure 5 As shown, the inner edge profile of the end surface 42 can be an octagonal star, so that Figure 2 As shown, two by two are grouped together, and sixteen magnetic steel slots 21 arranged in a V shape are covered.

[0054] In this way, each exposed magnetic steel 3 can be covered by the end surface portion 42, and the magnetic steel 3 can be protected to prevent the magnetic steel 3 from being corroded by the external environment. At the same time, the end surface portion 42 can also limit the axial position of the magnetic steel 3 to a certain extent, which can greatly reduce the possibility of axial movement of the magnetic steel 3, which is beneficial to improving the stability of the rotor assembly and ensuring the quality and performance of the rotor assembly.

[0055] In one example, reference Figure 2 , Figure 4 and Figure 5 As shown, each section of the rotor core 2 has a plurality of through holes, and the plurality of through holes penetrate the corresponding rotor core 2 along the axial direction of the rotating shaft 1 and are evenly distributed around the axis of the rotating shaft 1. The through holes of each adjacent section of the rotor core 2 correspond to each other, and the corresponding through holes are interconnected to form weight reduction holes 22.

[0056] For example, in Figure 5 In the embodiment, each section of the rotor core 2 may have eight through holes, thereby forming eight weight-reducing holes 22; however, each section of the rotor core 2 may have six through holes, thereby forming six weight-reducing holes 22; or each section of the rotor core 2 may have ten through holes, thereby forming ten weight-reducing holes 22.

[0057] The outer diameter of the pressing ring 5 is smaller than the maximum distance between the lightening hole 22 and the axis of the rotating shaft 1. For example, the outer diameter of the pressing ring 5 may be 35 mm, and the maximum distance between the lightening hole 22 and the axis of the rotating shaft 1 may be 40 mm, 42 mm, or 38 mm. Alternatively, the outer diameter of the pressing ring 5 may be 40 mm, and the maximum distance between the lightening hole 22 and the axis of the rotating shaft 1 may be 49 mm, 43 mm, or 47 mm.

[0058] In this way, on one hand, due to the existence of the weight-reducing holes 22, the weight of the rotor assembly can be reduced, which is beneficial to improving the performance of the rotor assembly.

[0059] On the other hand, the outer diameter of the pressing ring 5 is smaller than the maximum distance between the lightening hole 22 and the axis of the rotating shaft 1, so that the two pressing rings 5 ​​will not block the lightening hole 22. Therefore, the heat generated by the rotor core 2 can be dissipated through the lightening hole 22, thereby enhancing the heat dissipation capacity of the rotor core 2, which is beneficial to further improve the performance of the rotor assembly.

[0060] In one example, the outer diameter of the pressing ring 5 is smaller than the minimum distance between the magnetic steel 3 and the axis of the rotating shaft 1. For example, the outer diameter of the pressing ring 5 may be 30 mm, and the minimum distance between the magnetic steel 3 and the axis of the rotating shaft 1 may be 35 mm, 36 mm, or 33 mm, etc.; the outer diameter of the pressing ring 5 may be 33 mm, and the minimum distance between the magnetic steel 3 and the axis of the rotating shaft 1 may be 35 mm, 36 mm, or 38 mm, etc.

[0061] In this way, the outer diameter of the pressing ring 5 is smaller than the minimum distance between the magnetic steel 3 and the axis of the rotating shaft 1 , so that the pressing ring 5 and the magnetic steel 3 will not come into contact, thereby avoiding affecting the performance of the rotor assembly.

[0062] In one example, each adjacent section of the rotor core 2 is rotated by a certain angle around the axis of the rotating shaft 1 , so that the pores 211 of each adjacent section of the rotor core 2 partially overlap along the axial direction of the rotating shaft 1 .

[0063] For example, each section of the rotor core 2 from the first end to the second end of the rotor assembly may be rotated clockwise by an angle α relative to the previous section of the rotor core 2, so that a magnetic pole misalignment angle of an angle α in the circumferential direction is generated between each adjacent section of the rotor core 2. In this way, each bonding portion 41 may be presented as follows: Figure 3 The steps shown.

[0064] Thus, the cogging torque fluctuation of the rotor assembly can be greatly reduced, thereby improving the performance of the motor and reducing magnetic noise. At the same time, since the pores 211 of each adjacent section of the rotor core 2 overlap along the axial part of the rotating shaft 1, each bonding portion 41 is still continuous, so that integrated glue injection can be achieved.

[0065] In the disclosed embodiment, the corresponding pores 211 in adjacent rotor cores 2 are connected to form a glue path, so that each bonding portion 41 filled in the glue path is continuous. The end surface 42 of the integrated glue injection structure 4 is arranged on the end surfaces of the two sections of the rotor core 2 located at the two ends of the rotor assembly that are away from each other, and the two end surface portions 42 are respectively connected to the two ends of each bonding portion 41, so that the two end surface portions 42 are connected to each bonding portion 41.

[0066] Therefore, the integrated glue injection structure 4 can be formed in one step by means of integrated glue injection, and the magnetic steel 3 can be fixed on the rotor core 2 in one step. After forming, there is no need to clean the excess material on the surface of the rotor core 2. Therefore, on the one hand, the fixing process of the magnetic steel 3 can be simplified, and on the other hand, the performance and quality of the rotor assembly will not be affected.

[0067] This embodiment also provides a motor, which includes a rotor assembly as described in any one of the first aspects.

[0068] In the disclosed embodiment, the corresponding pores 211 in adjacent rotor cores 2 are connected to form a glue path, so that each bonding portion 41 filled in the glue path is continuous. The end surface 42 of the integrated glue injection structure 4 is arranged on the end surfaces of the two sections of the rotor core 2 located at the two ends of the rotor assembly that are away from each other, and the two end surface portions 42 are respectively connected to the two ends of each bonding portion 41, so that the two end surface portions 42 are connected to each bonding portion 41.

[0069] Therefore, the integrated glue injection structure 4 can be formed in one step by means of integrated glue injection, and the magnetic steel 3 can be fixed on the rotor core 2 in one step. After forming, there is no need to clean the excess material on the surface of the rotor core 2. Therefore, on the one hand, the fixing process of the magnetic steel 3 can be simplified, and on the other hand, the performance and quality of the rotor assembly will not be affected.

[0070] This embodiment also provides a vehicle, which includes the motor as described in the second aspect.

[0071] In the disclosed embodiment, the corresponding pores 211 in adjacent rotor cores 2 are connected to form a glue path, so that each bonding portion 41 filled in the glue path is continuous. The end surface 42 of the integrated glue injection structure 4 is arranged on the end surfaces of the two sections of the rotor core 2 located at the two ends of the rotor assembly that are away from each other, and the two end surface portions 42 are respectively connected to the two ends of each bonding portion 41, so that the two end surface portions 42 are connected to each bonding portion 41.

[0072] Therefore, the integrated glue injection structure 4 can be formed in one step by means of integrated glue injection, and the magnetic steel 3 can be fixed on the rotor core 2 in one step. After forming, there is no need to clean the excess material on the surface of the rotor core 2. Therefore, on the one hand, the fixing process of the magnetic steel 3 can be simplified, and on the other hand, the performance and quality of the rotor assembly will not be affected.

[0073] This embodiment also provides a method for manufacturing a rotor assembly, referring to Figure 6 As shown, the manufacturing method of the rotor assembly is used to manufacture any rotor assembly as in the first aspect, and comprises the following steps:

[0074] The first step 101 includes: inserting each magnetic steel 3 into the magnetic steel slot 21 corresponding to the rotor core 2. For example, the magnetic steel 3 and the magnetic steel slot 21 of the rotor core 2 are clearance-matched in the length and width directions of the magnetic steel 3.

[0075] The second step 102 includes: sequentially assembling each rotor core 2 with magnetic steel 3 into a glue injection tooling mold.

[0076] The third step 103 includes: injecting glue into the glue injection tooling mold to form an integrated glue injection structure 4, so that the integrated glue injection structure 4, the magnetic steel 3 and the rotor core 2 form a rotor core assembly 20, and taking out the rotor core assembly 20 from the glue injection tooling mold.

[0077] The fourth step 104 includes: assembling the rotor core assembly 20 on the rotating shaft 1 .

[0078] As can be seen from the above, the manufacturing method of the rotor assembly can form the integrated injection structure 4 in one step, and complete the fixing of the magnetic steel 3 on the rotor core 2 in one step, and after forming, there is no need to clean the excess material on the surface of the rotor core 2. At the same time, the rotor core assembly 20 can be quickly assembled on the rotating shaft 1, thereby realizing efficient manufacturing of the rotor assembly.

[0079] In one example, the rotor assembly further includes two pressing rings 5, both of which are fixedly sleeved on the rotating shaft 1 and respectively abut against the end faces of the two sections of the rotor core 2 located at both ends of the rotor assembly that are away from each other, and the two end face portions 42 respectively surround the corresponding pressing rings 5. The first end of the rotating shaft 1 has a shaft shoulder 6. The manufacturing method of the rotor assembly further includes the following steps:

[0080] The fifth step includes: sleeve-fitting the first pressing ring 5 from the second end of the rotating shaft 1 onto the rotating shaft 1, and moving toward the first end of the rotating shaft 1 until the first pressing ring 5 abuts against the shaft shoulder 6. The first pressing ring 5 and the rotating shaft 1 may be clearance-fitted.

[0081] It should be noted that the fifth step may be placed before any step from the first step 101 to the fourth step 104 .

[0082] The fourth step 104 also includes: sleeve-fitting the rotor core assembly 20 onto the shaft 1 from the second end of the shaft 1 , and moving toward the first end of the shaft 1 until the rotor core assembly 20 abuts against the shaft shoulder 6 .

[0083] The sixth step includes: installing the heated second pressing ring 5 from the second end of the rotating shaft 1 onto the rotating shaft 1, and moving it toward the first end of the rotating shaft 1 until the second pressing ring 5 contacts the rotor core assembly 20, and then maintaining the pressure for a period of time by the press until the second pressing ring 5 cools down and has an interference fit with the rotating shaft 1.

[0084] The seventh step includes: placing the rotor assembly into a magnetizer for magnetization, thereby completing the manufacture of the rotor assembly.

[0085] In this way, by means of heat-fitting, the first pressing ring 5 is clearance-fitted with the first end of the rotating shaft 1, and the second pressing ring 5 is interference-fitted with the second end of the rotating shaft 1, which can quickly and stably realize the axial fixation of the rotor core assembly 20 on the rotating shaft 1, thereby realizing efficient manufacturing of the rotor assembly.

[0086] In the embodiment of the present disclosure, the rotor assembly manufactured by the manufacturing method of the rotor assembly has a glue path formed by the mutually corresponding pores 211 in the adjacent rotor cores 2 being connected to each other, so that each bonding portion 41 filled in the glue path is continuous. The end face portion 42 of the integrated glue injection structure 4 is arranged on the end faces of the two sections of the rotor core 2 located at the two ends of the rotor assembly that are away from each other, and the two end face portions 42 are respectively connected to the two ends of each bonding portion 41, so that the two end face portions 42 are connected to each bonding portion 41.

[0087] Therefore, the integrated glue injection structure 4 can be formed in one step by means of integrated glue injection, and the magnetic steel 3 can be fixed on the rotor core 2 in one step. After forming, there is no need to clean the excess material on the surface of the rotor core 2. Therefore, on the one hand, the fixing process of the magnetic steel 3 can be simplified, and on the other hand, the performance and quality of the rotor assembly will not be affected.

[0088] Furthermore, the manufacturing method of the rotor assembly enables the one-piece glue injection structure 4 to be formed in one step, and the magnetic steel 3 to be fixed on the rotor core 2 in one step, and after forming, there is no need to clean the excess material on the surface of the rotor core 2. At the same time, the rotor core assembly 20 can be quickly assembled on the rotating shaft 1, thereby realizing efficient manufacturing of the rotor assembly.

[0089] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present disclosure can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0090] The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A rotor assembly, characterized in that: The rotor assembly comprises a rotating shaft (1), a multi-section rotor core (2), a plurality of magnetic steels (3) and an integrated glue injection structure (4); The multiple sections of the rotor core (2) are sequentially sleeved on the rotating shaft (1), each section of the rotor core (2) has a plurality of magnetic steel slots (21), the plurality of magnetic steel slots (21) are evenly distributed around the axis of the rotating shaft (1), and the magnetic steel slots (21) penetrate the corresponding rotor core (2) along the axial direction of the rotating shaft (1); The magnetic steel (3) corresponds to the magnetic steel slot (21) one by one and is installed in the corresponding magnetic steel slot (21). A pore (211) is provided between each magnetic steel (3) and the slot wall of the corresponding magnetic steel slot (21). The pore (211) penetrates the rotor core (2) along the axial direction of the rotating shaft (1). The pores (211) of each adjacent section of the rotor core (2) correspond to each other one by one, and the pores (211) corresponding to each other are connected to each other to form a rubber path. The integrated glue injection structure (4) comprises a plurality of bonding portions (41) and two end face portions (42), wherein the bonding portions (41) correspond to the glue paths one by one and are filled in the corresponding glue paths, and the two end face portions (42) are respectively arranged around the rotating shaft (1) on the end faces of two sections of the rotor core (2) located at the two ends of the rotor assembly that are away from each other, and are respectively connected to the two ends of each bonding portion (41).

2. The rotor assembly according to claim 1, characterized in that: The rotor assembly further comprises two pressing rings (5), the two pressing rings (5) being fixedly sleeved on the rotating shaft (1) and respectively abutting against end surfaces of two sections of the rotor core (2) located at two ends of the rotor assembly that are away from each other, and the two end surface portions (42) respectively surround the corresponding pressing rings (5).

3. The rotor assembly according to claim 2, characterized in that: The diameter of the outer edge of the end surface portion (42) is configured so that the end surface portion (42) covers the outer periphery of the corresponding end surface of the rotor core (2).

4. The rotor assembly according to claim 3, characterized in that: The inner edge profile of the end surface portion (42) is configured such that the end surface portion (42) also covers each of the magnetic steels (3).

5. The rotor assembly according to claim 2, characterized in that: Each section of the rotor core (2) has a plurality of through holes, and the plurality of through holes penetrate the corresponding rotor core (2) along the axial direction of the rotating shaft (1) and are evenly distributed around the axis of the rotating shaft (1). The through holes of each adjacent section of the rotor core (2) correspond to each other, and the corresponding through holes are interconnected to form a weight-reducing hole (22). The outer diameter of the pressure ring (5) is smaller than the maximum distance between the weight-reducing hole (22) and the axis of the rotating shaft (1).

6. The rotor assembly according to claim 2, characterized in that: The outer diameter of the pressing ring (5) is smaller than the minimum distance between the magnetic steel (3) and the axis of the rotating shaft (1).

7. The rotor assembly according to claim 1, characterized in that: Each adjacent section of the rotor core (2) is rotated at a certain angle around the axis of the rotating shaft (1), so that the pores (211) of each adjacent section of the rotor core (2) partially overlap along the axial direction of the rotating shaft (1).

8. A motor, characterized in that: The motor comprises a rotor assembly as claimed in any one of claims 1 to 7.

9. A vehicle, characterized in that: The vehicle comprises the electric machine as claimed in claim 8.

10. A method for manufacturing a rotor assembly, characterized in that: The manufacturing method of the rotor assembly is used to manufacture the rotor assembly according to any one of claims 1 to 7, and comprises: Inserting each of the magnetic steels (3) into the magnetic steel slot (21) corresponding to the rotor core (2); Sequentially assembling each of the rotor cores (2) with the magnetic steel (3) into a glue injection tooling mold; Injecting glue into the glue injection tooling mold to form the integrated glue injection structure (4), so that the integrated glue injection structure (4), the magnetic steel (3) and the rotor core (2) form a rotor core assembly (20), and taking out the rotor core assembly (20) from the glue injection tooling mold; The rotor core assembly (20) is assembled on the rotating shaft (1).

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