Rotor punching sheet, rotor iron core, rotor, motor, driving system and vehicle

Abstract

The utility model provides a rotor punching sheet, a rotor iron core, a rotor, a motor, a driving system and a vehicle. The rotor punching sheet comprises a punching sheet body, and the punching sheet body is provided with a mounting hole, a plurality of lightening holes, a plurality of pressure relief holes and a plurality of magnet groove groups. The plurality of magnet groove groups are arranged at intervals along the circumferential direction of the mounting hole; each magnet groove group is positioned between the mounting hole and the pressure relief hole; the part, located between every two adjacent pressure relief holes, of the punching sheet body is a first part of the punching sheet body, the part, located between every two adjacent magnet groove sets, of the punching sheet body is a second part of the punching sheet body, and the part, opposite to the second part of the punching sheet body, of the peripheral wall of the punching sheet body is a matching wall of the punching sheet body. The lightening hole is located between the matching wall and the first part of the punching sheet body. According to the rotor punching sheet, the structure of the rotor punching sheet is reasonably arranged, and the plurality of pressure relief holes and the plurality of lightening holes are matched, so that extrusion stress transmitted to the outer edges of the magnet groove groups and the rotor punching sheet from all directions and all angles can be reduced, and the extrusion stress can be released through deformation of the plurality of pressure relief holes and the plurality of lightening holes; the vibration noise during the operation of the motor can be reduced, the deterioration of the performance of the motor can be effectively inhibited, and the use performance and the market competitiveness of the product are improved.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more specifically, to a rotor lamination, a rotor core, a rotor, a motor, a drive system, and a vehicle. Background Technology

[0002] The rotor consists of a rotor core and a shaft, with the rotor core and shaft having an interference fit. The rotor core comprises multiple stacked rotor laminations.

[0003] When assembling the rotor core and shaft, the compressive stress created by the interference fit between the shaft and the rotor core can cause overall deformation of the rotor laminations, with larger deformations at the magnet slots and outer edges of the laminations. This results in changes to the overall dimensions of the rotor core, increasing motor vibration and noise. Utility Model Content

[0004] This application aims to address at least one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, the first aspect of this application proposes a rotor lamination.

[0006] The second aspect of this application proposes a rotor core.

[0007] A third aspect of this application proposes a rotor.

[0008] The fourth aspect of this application proposes an electric motor.

[0009] The fifth aspect of this application proposes a driving system.

[0010] The sixth aspect of this application proposes a vehicle.

[0011] In view of the above, a first aspect of this application provides a rotor lamination, comprising: a lamination body, the lamination body having mounting holes, a plurality of weight reduction holes, a plurality of pressure relief holes, and a plurality of magnet slots; the plurality of magnet slots are arranged circumferentially at intervals along the mounting holes; each magnet slot is located between the mounting holes and the pressure relief holes; the portion of the lamination body located between two adjacent pressure relief holes is a first portion of the lamination body, the portion of the lamination body located between two adjacent magnet slots is a second portion of the lamination body, and the portion of the outer peripheral wall of the lamination body opposite to the second portion of the lamination body is a mating wall of the lamination body; the weight reduction holes are located between the mating wall and the first portion of the lamination body.

[0012] The rotor lamination provided in this application includes a lamination body.

[0013] The lamination body is provided with mounting holes, multiple weight reduction holes, multiple pressure relief holes, and multiple magnet slots. That is, the lamination body serves as the mounting carrier for the mounting holes, multiple weight reduction holes, multiple pressure relief holes, and multiple magnet slots, ensuring the matching dimensions of the mounting holes, multiple weight reduction holes, multiple pressure relief holes, and multiple magnet slots.

[0014] Multiple magnet slots are arranged circumferentially at intervals along the mounting holes. Multiple rotor laminations have magnet slots extending axially to form slots for accommodating permanent magnets. Multiple rotor laminations have pressure relief holes extending axially to form pressure relief through-holes. Multiple rotor laminations have mounting holes extending axially to form shaft holes, which are interference-fitted with the rotor shaft. Multiple rotor laminations have weight reduction holes extending axially to form weight reduction through-holes.

[0015] Each magnet slot is located between the mounting hole and the pressure relief hole, thus defining the positional relationship between the magnet slots, mounting hole, and pressure relief hole. The distance from the pressure relief hole to the mounting hole is less than the distance from the magnet slot to the mounting hole. In other words, the pressure relief hole is closer to the mounting hole than the magnet slots, and the pressure relief hole is positioned opposite to both the magnet slots and the mounting hole. This positioning of the pressure relief hole effectively reduces the compressive stress transmitted to the outer edges of the magnet slots and rotor laminations during the interference fit between the rotor core and shaft. This compressive stress is released through deformation via the pressure relief hole, preventing overall deformation of the rotor laminations due to compressive stress. This effectively reduces deformation at the outer edges of the magnet slots and rotor laminations, ensuring the dimensional stability of the rotor laminations and maintaining proper clearance between multiple rotor laminations during motor operation. This effectively prevents deformation of multiple rotor laminations, reducing vibration and noise during motor operation, suppressing performance degradation, and improving product performance and market competitiveness.

[0016] Furthermore, the portion of the lamination body located between two adjacent pressure relief holes constitutes the first part of the lamination body, and the portion of the lamination body located between two adjacent magnet slots constitutes the second part of the lamination body. The portion of the outer peripheral wall of the lamination body opposite to the second part of the lamination body constitutes the mating wall of the lamination body. The weight reduction hole is located between the mating wall and the first part of the lamination body, thus defining the positional relationship between the pressure relief hole, the mounting hole, and the weight reduction hole. The distance from the pressure relief hole to the mounting hole is less than the distance from the weight reduction hole to the mounting hole. In other words, the pressure relief hole is closer to the mounting hole than the weight reduction hole. The portion of the lamination body between two adjacent pressure relief holes is opposite to the weight reduction hole, and the portion of the lamination body between two adjacent pressure relief holes is opposite to the mounting hole. The placement of the weight-reducing holes effectively reduces the compressive stress transmitted to the first edge when the rotor core and shaft are interference-fitted. This compressive stress is released through deformation of the weight-reducing holes, preventing overall deformation of the rotor laminations due to compressive stress. This ensures the dimensional stability of the rotor laminations and maintains the appropriate gaps between multiple rotor laminations during motor operation. It effectively prevents deformation of multiple rotor laminations, thereby reducing vibration and noise during motor operation, suppressing performance degradation, and improving product performance and market competitiveness.

[0017] The combination of multiple pressure relief holes and multiple weight reduction holes can reduce the compressive stress transmitted to the outer edge of the magnet slot assembly and rotor lamination from various directions and angles, and release the compressive stress through deformation of multiple pressure relief holes and multiple weight reduction holes.

[0018] Furthermore, the weight-reducing holes are located between the mating wall and the first part of the lamination body. By defining the placement of these holes, the moment of inertia can be reduced, thus lightening the overall weight of the motor, without affecting its performance. In other words, the weight-reducing holes not only reduce the overall weight of the motor but also reduce the compressive stress transmitted to the outer edge of the rotor laminations. This reuse of the weight-reducing hole structure enriches its functionality, ensuring the performance of the rotor laminations while reducing the number of machining steps and the processing difficulty, ultimately lowering the production cost of the rotor laminations.

[0019] In addition, the weight reduction hole is located between the mating wall and the first part of the lamination body. Compared with the weight reduction hole being located between two adjacent pressure relief holes and the mounting hole, this arrangement can ensure the spacing between the pressure relief hole and the magnet slot assembly, and reduce interference to the magnetic circuit.

[0020] The rotor lamination described above according to this application may also have the following additional technical features:

[0021] In some embodiments, optionally, along the circumferential direction of the rotor lamination, the wall of the weight reduction hole includes a first wall surface and a second wall surface disposed opposite to each other; in two adjacent pressure relief holes, the first wall surface of the weight reduction hole is disposed opposite to one pressure relief hole, and the second wall surface of the weight reduction hole is disposed opposite to the other pressure relief hole.

[0022] In this embodiment, the mating structure of the weight reduction hole and the pressure relief hole is further defined.

[0023] Along the circumference of the rotor lamination, the wall of the weight reduction hole includes a first wall surface and a second wall surface, which are arranged opposite to each other.

[0024] In two adjacent pressure relief holes, the first wall surface of the weight reduction hole is positioned opposite to one pressure relief hole, and the second wall surface of the weight reduction hole is positioned opposite to the other pressure relief hole. That is, the first part of the weight reduction hole is positioned opposite to one pressure relief hole, and the second part of the weight reduction hole is positioned opposite to the other pressure relief hole. Therefore, a portion of the outer edge of the rotor lamination is positioned opposite to the pressure relief hole, and another portion of the outer edge of the rotor lamination is positioned opposite to the weight reduction hole. There is no portion of the outer edge of the rotor lamination that is neither opposite to a pressure relief hole nor a weight reduction hole. Thus, the combination of multiple pressure relief holes and multiple weight reduction holes can reduce the compressive stress transmitted to the external magnet slot assembly and the outer edge of the rotor lamination in various directions and at various angles, and can release this compressive stress through deformation of the multiple pressure relief holes and multiple weight reduction holes.

[0025] It is understandable that the central angle corresponding to the part of the lamination body located between two adjacent pressure relief holes is denoted as A1, and the central angle corresponding to the weight reduction hole is denoted as A2, where A2 is greater than A1.

[0026] In some embodiments, the plurality of weight reduction holes and the plurality of pressure relief holes are optionally arranged at circumferential intervals along the mounting holes.

[0027] In this embodiment, the mating structure of multiple weight reduction holes and multiple pressure relief holes is further defined.

[0028] Multiple weight-reducing holes are arranged at intervals along the circumference of the mounting hole. That is, the distance from any two weight-reducing holes to the mounting hole is equal. Among them, at least a portion of the multiple weight-reducing holes are arranged at equal intervals along the circumference of the mounting hole, or the multiple weight-reducing holes are arranged at unequal intervals.

[0029] Multiple pressure relief holes are arranged at intervals along the circumference of the mounting hole. That is, the distance from any two pressure relief holes to the mounting hole is equal. Among them, at least a portion of the multiple pressure relief holes are arranged at equal intervals along the circumference of the mounting hole, or the multiple pressure relief holes are arranged at unequal intervals.

[0030] This setting ensures the dynamic balance of the motor, which helps to further reduce the operating noise of the motor and ensure the performance of the motor.

[0031] In some embodiments, optionally, in the pressure relief hole and the two adjacent weight reduction holes, the line connecting the center of the pressure relief hole and the center of the mounting hole is referred to as the first line, and the line connecting the center of the weight reduction hole and the center of the mounting hole is referred to as the second line, with the first line located between the two second lines.

[0032] In this embodiment, the mating structure of the pressure relief hole and the weight reduction hole is further defined.

[0033] In the pressure relief hole and the two adjacent weight reduction holes, the line connecting the center of the pressure relief hole and the center of the mounting hole is the first connecting line, and the line connecting the center of the weight reduction hole and the center of the mounting hole is the second connecting line. The first connecting line lies between the two second connecting lines. That is, the first connecting line and the second connecting line do not coincide. In other words, by arranging multiple weight reduction holes and multiple pressure relief holes staggered along the circumference of the rotor lamination, the effectiveness and feasibility of reducing the compressive stress transmitted to the magnet slots and the outer edge of the rotor lamination from all directions are ensured. This also helps to reduce the size of the pressure relief holes and weight reduction holes, ensuring the structural strength and rigidity of the rotor lamination and reducing the deformation of the rotor lamination during motor operation.

[0034] In some embodiments, optionally, the angle between the first connection line and the second connection line is equal to 180° / n, where n is the number of rotor poles.

[0035] In this embodiment, the mating structure of multiple weight reduction holes and multiple pressure relief holes is further defined.

[0036] In the pressure relief hole and the two adjacent weight reduction holes, the line connecting the center of the pressure relief hole and the center of the mounting hole is the first line, and the line connecting the center of the weight reduction hole and the center of the mounting hole is the second line. The angle between the first and second lines is equal to 180° / n, where n is the number of rotor poles. This arrangement ensures that multiple pressure relief holes and multiple weight reduction holes are equally spaced along the circumference of the rotor laminations.

[0037] This setting ensures the dynamic balance of the motor, which helps to further reduce the operating noise of the motor and ensure the performance of the motor.

[0038] In some embodiments, the distance from the pressure relief hole to the mounting hole may be greater than or equal to 3 mm and less than or equal to 12 mm.

[0039] In this embodiment, the mating structure of the mounting hole and the pressure relief hole is further defined.

[0040] Specifically, the distance from the pressure relief hole to the mounting hole is greater than or equal to 3 mm and less than or equal to 12 mm. That is, along the radial direction of the rotor lamination, the distance from the pressure relief hole to the mounting hole is greater than or equal to 3 mm and less than or equal to 12 mm.

[0041] This design ensures the dimensions of the portion of the lamination body located between the mounting hole and the pressure relief hole, thus guaranteeing the structural strength and rigidity of the rotor lamination and reducing the probability of deformation of the rotor lamination during the assembly of the rotor core and shaft.

[0042] If the distance from the pressure relief hole to the mounting hole is less than 3mm, the size of the portion of the lamination body located between the mounting hole and the pressure relief hole will be smaller. When the rotor core and shaft are interference-fitted, the portion of the lamination body located between the mounting hole and the pressure relief hole is easily deformed, which makes it impossible to guarantee the fit dimensions of two adjacent rotor laminations, and may result in lamination breakage.

[0043] If the distance from the pressure relief hole to the mounting hole is greater than 12mm, then the distance from the pressure relief hole to the magnet slot is smaller, which can easily affect the magnetic circuit and thus affect the performance of the motor.

[0044] In some embodiments, the maximum value of the radial width of the pressure relief hole in the rotor lamination is greater than or equal to 2 mm.

[0045] In this embodiment, the structure of the pressure relief hole is further defined.

[0046] Specifically, the maximum width of the pressure relief hole along the radial direction of the rotor lamination is greater than or equal to 2 mm. This helps to reduce the machining difficulty of the pressure relief hole, reduce the wear of the mold used to machine the pressure relief hole, extend the service life of the mold, and thus reduce the machining cost of the rotor lamination.

[0047] In addition, this design can effectively reduce the compressive stress transmitted to the external magnet slots and the outer edges of the rotor laminations. If the maximum radial width of the pressure relief hole in the rotor lamination is less than 2 mm, the effect of reducing the compressive stress transmitted to the external magnet slots and the outer edges of the rotor laminations is poor, and the deformation of the rotor lamination is large.

[0048] In some embodiments, the pressure relief hole may optionally include a plurality of connecting walls connected end to end, with a smooth transition at the connection between any two adjacent connecting walls, and the minimum radius corresponding to the connection between two adjacent connecting walls being greater than or equal to 1 mm.

[0049] In this embodiment, the structure of the pressure relief hole is further defined. The hole wall of the pressure relief hole includes multiple connecting walls that are connected end to end in sequence. That is, along the circumference of the pressure relief hole, the hole wall includes multiple connecting walls that are connected end to end in sequence. The extension directions of any two adjacent connecting walls are different, and the connection point of any two adjacent connecting walls forms a corner.

[0050] Among them, the connection between any two adjacent connecting walls is smoothly transitioned, and the minimum radius of the connection between two adjacent connecting walls is greater than or equal to 1 mm.

[0051] This design simplifies the machining of the pressure relief hole, thus reducing its machining cost. Furthermore, it reduces wear on the molds used for machining the pressure relief hole, extending their lifespan and consequently lowering the machining cost of the rotor laminations.

[0052] Furthermore, this design can avoid stress concentration and ensure the structural strength and rigidity of the rotor laminations.

[0053] In some embodiments, optionally, on the axial end face of the lamination body, the maximum value of the width of the pressure relief hole in the radial direction of the rotor lamination is denoted as H, and the maximum value of the length of the pressure relief hole in the radial direction perpendicular to the rotor lamination is denoted as L, where L / H≥1.

[0054] In this embodiment, the structure of the pressure relief hole is further defined.

[0055] On the axial end face of the lamination body, the maximum width of the pressure relief hole in the radial direction of the rotor lamination is H, and the maximum length of the pressure relief hole in the radial direction perpendicular to the rotor lamination is L.

[0056] Where L / H≥1.

[0057] This design ensures that the compressive stress transmitted to the outer edges of the magnet slots and rotor laminations is reduced, while maintaining the spacing between the pressure relief holes and the magnet slots to reduce the impact on the magnetic circuit, and also helps to increase the structural strength and rigidity of the rotor laminations.

[0058] In some embodiments, the magnet slot assembly may optionally include: a plurality of magnet slots arranged radially spaced along the mounting hole, each magnet slot including two slot bodies, each slot body including a first end and a second end, the first end being closer to the mounting hole than the second end; in the magnet slots, the first ends of the two slot bodies are disposed adjacent to each other, and the second ends of the two slot bodies are disposed away from each other.

[0059] In this embodiment, the magnet slot assembly includes multiple magnet slots, which are arranged at radial intervals along the mounting hole.

[0060] Each magnet slot includes two slots, each slot including a first end and a second end.

[0061] The distance from the first end to the mounting hole is less than the distance from the second end to the mounting hole. In the magnet slot, the first ends of the two slots are arranged close together, and the second ends of the two slots are arranged far apart.

[0062] That is, the two slots of each magnet slot are arranged in a V-shape, and the opening of the V-shape faces the outer peripheral wall of the lamination body. In other words, the tip of the V-shape faces the mounting hole.

[0063] Since the magnetic bridge area near the two slots of each magnet slot is the most dangerous part of the lamination body, the stress level is high and the fatigue life is relatively low. Therefore, by reasonably setting the matching structure of pressure relief holes, magnet slot groups, mounting holes and weight reduction holes, the deformation of the magnetic bridge area of ​​the lamination body can be ensured to be balanced, so that the stress is relatively uniformly distributed, which can effectively reduce the impact on the magnetic flux distribution on the lamination body.

[0064] In some embodiments, optionally, at least a portion of the weight reduction hole is located in the second portion of the lamination body.

[0065] In this embodiment, the location of the weight reduction hole is further defined, such that at least a portion of the weight reduction hole is located in the second part of the lamination body.

[0066] In this way, the structure of the lamination body is rationally utilized, and while ensuring the matching structure of the weight reduction hole, pressure relief hole and mounting hole, it is beneficial to reduce the radial dimension of the lamination body in the rotor lamination.

[0067] The second aspect of this utility model provides a rotor core, comprising: a plurality of rotor laminations as in the first aspect, wherein the plurality of rotor laminations are stacked; along the axial direction of the rotor core, mounting holes of the plurality of rotor laminations are connected to form shaft holes, weight reduction holes of the plurality of rotor laminations are connected to form weight reduction through holes, pressure relief holes of the plurality of rotor laminations are connected to form pressure relief through holes, and magnet slots of the plurality of rotor laminations are connected to form slots.

[0068] The rotor core provided by this utility model includes multiple rotor laminations as described in the first aspect, and therefore has all the beneficial effects of the aforementioned rotor laminations, which will not be described in detail here.

[0069] Understandably, multiple magnet slots are arranged circumferentially at intervals along the mounting holes. Multiple rotor laminations have magnet slots extending axially to form slots for accommodating permanent magnets. Multiple rotor laminations have pressure relief holes extending axially to form pressure relief through-holes. Multiple rotor laminations have mounting holes extending axially to form shaft holes, which are interference-fitted with the rotor shaft. Multiple rotor laminations have weight reduction holes extending axially to form weight reduction through-holes.

[0070] The third aspect of this utility model provides a rotor, comprising: a rotating shaft; a plurality of permanent magnets; and a rotor core as described in the second aspect, wherein the rotating shaft is interference-fitted with a shaft hole, and the plurality of permanent magnets are disposed in a plurality of slots in a corresponding manner.

[0071] The rotor provided by this utility model includes a rotor core as described in the second aspect, and therefore has all the beneficial effects of the aforementioned rotor core, which will not be described in detail here.

[0072] In some embodiments, the rotating shaft may optionally include a cylindrical section located between two axial end faces of the rotating shaft, and the wall of the mounting hole is an annular wall that is interference-fitted with the cylindrical section.

[0073] In this embodiment, the mating structure of the shaft and the rotor core is further defined.

[0074] The shaft includes a cylindrical section located between its two axial end faces. The mounting hole has an annular wall that is interference-fitted with the cylindrical section. Compared to shafts and rotor cores having keyways, where the keyway and rotor core are fitted together to define their dimensions, this design reduces the machining difficulty and cost of the shaft and core. It also avoids dynamic imbalance caused by the keyway and keyway fit, thus reducing low-order noise during motor operation and improving product performance and market competitiveness.

[0075] The fourth aspect of this utility model provides an electric motor, comprising: a rotor as described in the third aspect.

[0076] The motor provided by this utility model includes a rotor as described in the third aspect, and therefore has all the beneficial effects of the rotor mentioned above, which will not be described in detail here.

[0077] The fifth aspect of this utility model provides a drive system comprising: a motor as described in the fourth aspect.

[0078] The drive system provided by this utility model includes a motor as described in the fourth aspect, and therefore has all the beneficial effects of the aforementioned motor, which will not be described in detail here.

[0079] The sixth aspect of this utility model provides a vehicle comprising: an electric motor as described in the fourth aspect; or a drive system as described in the fifth aspect.

[0080] The vehicle provided by this utility model includes a motor as described in the fourth aspect, or a drive system as described in the fifth aspect, and therefore has all the beneficial effects of the aforementioned motor or drive system, which will not be described in detail here.

[0081] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0082] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0083] Figure 1 A schematic diagram of the rotor structure of one embodiment of this application is shown;

[0084] Figure 2 for Figure 1 A magnified view of part A of the rotor shown;

[0085] Figure 3 A schematic diagram of the rotor lamination structure of one embodiment of this application is shown;

[0086] Figure 4 A schematic diagram of the structure of a rotating shaft according to an embodiment of this application is shown.

[0087] Figure 5 A comparison diagram of the deformation of rotor laminations in this application and related technologies is shown.

[0088] in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0089] 1. Rotor core, 10. Rotor laminations, 100. Lamination body, 110. First connecting line, 120. Second connecting line, 130. First part, 140. Second part, 150. Mating wall, 200. Mounting hole, 300. Weight reduction hole, 310. First wall surface, 320. Second wall surface, 400. Pressure relief hole, 410. Connecting wall, 500. Magnet slot assembly, 510. Magnet slot, 512. Slot body, 5122. First end, 5124. Second end, 60. Shaft hole, 70. Weight reduction through hole, 80. Pressure relief through hole, 90. Slot, 2. Shaft, 22. Cylindrical section, 3. Rotor. Detailed Implementation

[0090] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0091] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0092] The following is in conjunction with the appendix Figures 1 to 5 The present application provides a detailed description of the rotor lamination 10, rotor core 1, rotor 3, motor, drive system, and vehicle provided in the embodiments of this application through specific implementation methods and application scenarios.

[0093] like Figure 3 As shown, a rotor lamination 10 according to some embodiments of this application includes a lamination body 100.

[0094] The lamination body 100 is provided with mounting holes 200, multiple weight reduction holes 300, multiple pressure relief holes 400 and multiple magnet slots 500.

[0095] Multiple magnet slots 500 are arranged at circumferential intervals along the mounting holes 200.

[0096] Each magnet slot 500 is located between the mounting hole 200 and the pressure relief hole 400.

[0097] The portion of the lamination body 100 located between two adjacent pressure relief holes 400 is the first portion 130 of the lamination body, the portion of the lamination body 100 located between two adjacent magnet slots 500 is the second portion 140 of the lamination body, and the portion of the outer peripheral wall of the lamination body 100 that is opposite to the second portion 140 of the lamination body is the mating wall 150 of the lamination body 100; the weight reduction hole 300 is located between the mating wall 150 and the first portion 130 of the lamination body.

[0098] The rotor lamination 10 provided in this application includes a lamination body 100.

[0099] The lamination body 100 is provided with mounting holes 200, multiple weight reduction holes 300, multiple pressure relief holes 400 and multiple magnet slots 500. That is, the lamination body 100 serves as the mounting carrier for the mounting holes 200, multiple weight reduction holes 300, multiple pressure relief holes 400 and multiple magnet slots 500, and can ensure the matching dimensions of the mounting holes 200, multiple weight reduction holes 300, multiple pressure relief holes 400 and multiple magnet slots 500.

[0100] Multiple magnet slots 500 are arranged circumferentially at intervals along the mounting holes 200. Multiple rotor laminations 10 have magnet slots 500 extending axially to form slots 90 for accommodating permanent magnets. Multiple rotor laminations 10 have pressure relief holes 400 extending axially to form pressure relief through holes 80. Multiple rotor laminations 10 have mounting holes 200 extending axially to form shaft holes 60, which are interference-fitted with the shaft 2 of the rotor 3. Multiple rotor laminations 10 have weight reduction holes 300 extending axially to form weight reduction through holes 70.

[0101] Each magnet slot assembly 500 is located between the mounting hole 200 and the pressure relief hole 400, thus defining the positional relationship between the magnet slot assembly 500, the mounting hole 200, and the pressure relief hole 400. The distance from the pressure relief hole 400 to the mounting hole 200 is less than the distance from the magnet slot assembly 500 to the mounting hole 200. In other words, the pressure relief hole 400 is closer to the mounting hole 200 than the magnet slot assembly 500, and the pressure relief hole 400 is positioned opposite to the magnet slot assembly 500, and also opposite to the mounting hole 200. The placement of the pressure relief hole 400 effectively reduces the compressive stress transmitted to the outer edges of the magnet slot assembly 500 and rotor lamination 10 during the interference fit between the rotor core 1 and the shaft 2. This compressive stress can be released through deformation of the pressure relief hole 400, preventing overall deformation of the rotor lamination 10 due to compressive stress. This effectively reduces deformation at the outer edges of the magnet slot assembly 500 and rotor lamination 10, ensuring the dimensional integrity of the rotor lamination 10. Consequently, it ensures the clearance between multiple rotor laminations 10 during motor operation, effectively preventing deformation of multiple rotor laminations 10. This reduces vibration and noise during motor operation, effectively suppresses motor performance degradation, and improves product performance and market competitiveness.

[0102] Furthermore, the portion of the lamination body 100 located between two adjacent pressure relief holes 400 is the first portion 130 of the lamination body, and the portion of the lamination body 100 located between two adjacent magnet slots 500 is the second portion 140 of the lamination body. The portion of the outer peripheral wall of the lamination body 100 opposite to the second portion 140 is the mating wall 150 of the lamination body 100. The weight reduction hole 300 is located between the mating wall 150 and the first portion 130 of the lamination body, thus defining the positional relationship between the pressure relief hole 400, the mounting hole 200, and the weight reduction hole 300. The distance from the pressure relief hole 400 to the mounting hole 200 is less than the distance from the weight reduction hole 300 to the mounting hole 200. In other words, the pressure relief hole 400 is closer to the mounting hole 200 than the weight reduction hole 300. The portion of the lamination body 100 between two adjacent pressure relief holes 400 is positioned opposite to the weight reduction hole 300, and the portion of the lamination body 100 between two adjacent pressure relief holes 400 is positioned opposite to the mounting hole 200. The position of the weight reduction hole 300 effectively reduces the compressive stress transmitted to the first edge when the rotor core 1 and the shaft 2 are interference-fitted. This compressive stress can be released through deformation of the weight reduction hole 300, preventing the overall deformation of the rotor lamination 10 due to compressive stress. This ensures the external dimensions of the rotor lamination 10, thereby ensuring the gap between multiple rotor laminations 10 during motor operation. This effectively prevents the deformation of multiple rotor laminations 10, thereby reducing vibration and noise during motor operation, effectively suppressing the deterioration of motor performance, and improving the product's performance and market competitiveness.

[0103] The multiple pressure relief holes 400 and multiple weight reduction holes 300 work together to reduce the compressive stress transmitted to the outer edge of the magnet slot group 500 and the rotor lamination 10 from various directions and angles. The compressive stress can be released by deformation through the multiple pressure relief holes 400 and multiple weight reduction holes 300.

[0104] Furthermore, the weight-reducing hole 300 is located between the mating wall 150 and the first part 130 of the lamination body. By defining the setting position of the weight-reducing hole 300, the moment of inertia can be reduced and the overall weight of the motor can be reduced without affecting the motor performance. In other words, the weight-reducing hole 300 not only reduces the overall weight of the motor but also reduces the compressive stress transmitted to the outer edge of the rotor lamination 10. Thus, by reusing the structure of the weight-reducing hole 300, its functionality is enriched. While ensuring the performance of the rotor lamination 10, the number of processing steps for the rotor lamination 10 is reduced, lowering the processing difficulty and ultimately reducing the production cost of the rotor lamination 10.

[0105] In addition, the weight reduction hole 300 is located between the mating wall 150 and the first part 130 of the lamination body. Compared with the weight reduction hole located between two adjacent pressure relief holes and the mounting hole, this arrangement can ensure the spacing between the pressure relief hole 400 and the magnet slot group 500, and can reduce interference to the magnetic circuit.

[0106] Optionally, each magnet slot 500 is located between a mounting hole 200 and a pressure relief hole 400.

[0107] Optionally, each magnet slot 500 is located between the mounting hole 200 and at least two pressure relief holes 400.

[0108] Optionally, the portion of the lamination body 100 between two adjacent pressure relief holes 400 is located between the mounting hole 200 and a weight reduction hole 300.

[0109] Optionally, the portion of the lamination body 100 between two adjacent pressure relief holes 400 is located between the mounting hole 200 and at least two weight reduction holes 300.

[0110] In some embodiments, optionally, such as Figure 3 As shown, along the circumference of the rotor lamination 10, the wall of the weight reduction hole 300 includes a first wall surface 310 and a second wall surface 320 disposed opposite to each other.

[0111] In two adjacent pressure relief holes 400, the first wall surface 310 of the weight reduction hole 300 is positioned opposite to one of the pressure relief holes 400.

[0112] The second wall surface 320 of the weight reduction hole 300 is positioned opposite to another pressure relief hole 400.

[0113] In this embodiment, the mating structure of the weight reduction hole 300 and the pressure relief hole 400 is further defined.

[0114] Along the circumference of the rotor lamination 10, the wall of the weight reduction hole 300 includes a first wall surface 310 and a second wall surface 320, which are arranged opposite to each other.

[0115] In two adjacent pressure relief holes 400, the first wall surface 310 of the weight reduction hole 300 is opposite to one pressure relief hole 400, and the second wall surface 320 of the weight reduction hole 300 is opposite to the other pressure relief hole 400. That is, the first part of the weight reduction hole 300 is opposite to one pressure relief hole 400, and the second part of the weight reduction hole 300 is opposite to the other pressure relief hole 400. Therefore, a portion of the outer edge of the rotor lamination 10 is opposite to the pressure relief hole 400, and another portion of the outer edge of the rotor lamination 10 is opposite to the weight reduction hole 300. There is no portion of the outer edge of the rotor lamination 10 that is neither opposite to a pressure relief hole 400 nor to a weight reduction hole 300. Thus, the cooperation of multiple pressure relief holes 400 and multiple weight reduction holes 300 can reduce the compressive stress transmitted to the external magnet slot assembly 500 and the outer edge of the rotor lamination 10 in various directions and angles, and can release this compressive stress through the deformation of the multiple pressure relief holes 400 and multiple weight reduction holes 300.

[0116] It is understandable that, such as Figure 3 As shown, the central angle corresponding to the portion of the lamination body 100 located between two adjacent pressure relief holes 400 is denoted as A1, and the central angle corresponding to the weight reduction hole 300 is denoted as A2, wherein A2 is greater than A1.

[0117] In some embodiments, optionally, such as Figure 3 As shown, multiple weight reduction holes 300 and multiple pressure relief holes 400 are arranged at circumferential intervals along the mounting hole 200.

[0118] In this embodiment, the mating structure of multiple weight reduction holes 300 and multiple pressure relief holes 400 is further defined.

[0119] Multiple weight-reducing holes 300 are arranged at intervals along the circumference of the mounting hole 200. That is, the distance from any two weight-reducing holes 300 to the mounting hole 200 is equal. Among them, at least a portion of the multiple weight-reducing holes 300 are arranged at equal intervals along the circumference of the mounting hole 200, or the multiple weight-reducing holes 300 are arranged at unequal intervals.

[0120] Multiple pressure relief holes 400 are arranged at intervals along the circumference of the mounting hole 200. That is, the distance from any two pressure relief holes 400 to the mounting hole 200 is equal. Among them, at least a portion of the multiple pressure relief holes 400 are arranged at equal intervals along the circumference of the mounting hole 200, or the multiple pressure relief holes 400 are arranged at unequal intervals.

[0121] This setting ensures the dynamic balance of the motor, which helps to further reduce the operating noise of the motor and ensure the performance of the motor.

[0122] In some embodiments, optionally, such as Figure 3 As shown, among the pressure relief hole 400 and the two adjacent weight reduction holes 300, the line connecting the center of the pressure relief hole 400 and the center of the mounting hole 200 is called the first connecting line 110, and the line connecting the center of the weight reduction hole 300 and the center of the mounting hole 200 is called the second connecting line 120.

[0123] The first connection 110 is located between the two second connections 120.

[0124] In this embodiment, the mating structure of the pressure relief hole 400 and the weight reduction hole 300 is further defined.

[0125] In the pressure relief hole 400 and the two adjacent weight reduction holes 300, the line connecting the center of the pressure relief hole 400 and the center of the mounting hole 200 is the first connecting line 110, and the line connecting the center of the weight reduction hole 300 and the center of the mounting hole 200 is the second connecting line 120. The first connecting line 110 is located between the two second connecting lines 120. That is, the first connecting line 110 and the second connecting line 120 do not coincide. In other words, along the circumference of the rotor lamination 10, the multiple weight reduction holes 300 and multiple pressure relief holes 400 are staggered. This not only ensures the effectiveness and feasibility of reducing the compressive stress transmitted to the magnet slot assembly 500 and the outer edge of the rotor lamination 10 from all directions, but also helps to reduce the size of the pressure relief hole 400 and the weight reduction hole 300, which can ensure the structural strength and rigidity of the rotor lamination 10 and help to reduce the deformation of the rotor lamination 10 during motor operation.

[0126] In some embodiments, optionally, such as Figure 3 As shown, the angle between the first line 110 and the second line 120 is equal to 180° / n, where n is the number of rotor poles.

[0127] In this embodiment, the mating structure of multiple weight reduction holes 300 and multiple pressure relief holes 400 is further defined.

[0128] In the pressure relief hole 400 and the two adjacent weight reduction holes 300, the line connecting the center of the pressure relief hole 400 and the center of the mounting hole 200 is the first connecting line 110, and the line connecting the center of the weight reduction hole 300 and the center of the mounting hole 200 is the second connecting line 120. The included angle between the first connecting line 110 and the second connecting line 120 is equal to 180° / n, where n is the number of rotor poles. This arrangement ensures that multiple pressure relief holes 400 and multiple weight reduction holes 300 are arranged at equal intervals along the circumference of the rotor lamination 10.

[0129] This setting ensures the dynamic balance of the motor, which helps to further reduce the operating noise of the motor and ensure the performance of the motor.

[0130] In some embodiments, the distance between the pressure relief hole 400 and the mounting hole 200 is optionally greater than or equal to 3 mm and less than or equal to 12 mm.

[0131] In this embodiment, the mating structure of the mounting hole 200 and the pressure relief hole 400 is further defined.

[0132] Specifically, such as Figure 3 As shown, the diameter of the mounting hole 200 is denoted as D1, and the distance from the pressure relief hole 400 to the side of the mounting hole 200 away from the pressure relief hole 400 is denoted as D2. The distance from the pressure relief hole 400 to the mounting hole 200 is equal to D2 - D1. Wherein, 3mm ≤ D2 - D1 ≤ 12mm.

[0133] This configuration ensures the dimensions of the portion of the lamination body 100 located between the mounting hole 200 and the pressure relief hole 400, thus guaranteeing the structural strength and rigidity of the rotor lamination 10 and reducing the probability of deformation of the rotor lamination 10 when assembling the rotor core 1 and the shaft 2.

[0134] If the distance between the pressure relief hole 400 and the mounting hole 200 is less than 3mm, the size of the portion of the lamination body 100 located between the mounting hole 200 and the pressure relief hole 400 will be small. When the rotor core 1 and the shaft 2 are interference-fitted, the portion of the lamination body 100 located between the mounting hole 200 and the pressure relief hole 400 is easily deformed, which makes it impossible to guarantee the fit dimensions of two adjacent rotor laminations 10, and may result in the laminations falling apart.

[0135] If the distance between the pressure relief hole 400 and the mounting hole 200 is greater than 12mm, then the distance between the pressure relief hole 400 and the magnet slot assembly 500 is smaller, which can easily affect the magnetic circuit and thus affect the performance of the motor.

[0136] Optionally, the distance between the pressure relief hole 400 and the mounting hole 200 includes 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm and 11mm, etc., which will not be listed here.

[0137] In some embodiments, the maximum value of the radial width of the pressure relief hole 400 in the rotor lamination 10 is greater than or equal to 2 mm.

[0138] In this embodiment, the structure of the pressure relief hole 400 is further defined.

[0139] Specifically, such as Figure 3As shown, the maximum width H of the pressure relief hole 400 along the radial direction of the rotor lamination 10 is greater than or equal to 2 mm. This helps to reduce the machining difficulty of the pressure relief hole 400, reduces the wear of the mold for machining the pressure relief hole 400, extends the service life of the mold, and thus helps to reduce the machining cost of the rotor lamination 10.

[0140] In addition, this design can effectively reduce the compressive stress transmitted to the outer edges of the magnet slot assembly 500 and rotor lamination 10. If the maximum radial width of the pressure relief hole 400 in the rotor lamination 10 is less than 2 mm, the effect of reducing the compressive stress transmitted to the outer edges of the magnet slot assembly 500 and rotor lamination 10 is poor, and the deformation of the rotor lamination 10 is large.

[0141] Optionally, the maximum value of the radial width of the pressure relief hole 400 on the rotor lamination 10 includes 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, 3.5 mm and 4 mm, etc., which will not be listed here.

[0142] In some embodiments, optionally, such as Figure 3 As shown, the wall of the pressure relief hole 400 includes multiple connecting walls 410 connected end to end.

[0143] The connection between any two adjacent connecting walls 410 is smoothly transitioned.

[0144] The minimum radius R at the connection point of two adjacent connecting walls 410 is greater than or equal to 1 mm.

[0145] In this embodiment, the structure of the pressure relief hole 400 is further defined. The hole wall of the pressure relief hole 400 includes a plurality of connecting walls 410 connected end to end in sequence. That is, along the circumferential direction of the pressure relief hole 400, the hole wall of the pressure relief hole 400 includes a plurality of connecting walls 410, which are connected end to end in sequence. The extension directions of any two adjacent connecting walls 410 are different, and the connection point of any two adjacent connecting walls 410 forms a corner.

[0146] The connection between any two adjacent connecting walls 410 is smoothly transitioned, and the minimum radius of the connection between two adjacent connecting walls 410 is greater than or equal to 1 mm.

[0147] This design simplifies the machining of the pressure relief hole 400, thereby reducing its machining cost. Furthermore, this design reduces wear on the mold used to machine the pressure relief hole 400, extending its service life and further reducing the machining cost of the rotor lamination 10.

[0148] Furthermore, this design can avoid stress concentration and ensure the structural strength and rigidity of the rotor lamination 10.

[0149] Optionally, the minimum radius corresponding to the connection point of two adjacent connecting walls 410 includes 1.2mm, 1.5mm, 2mm, 2.2mm, 2.5mm and 2.8mm, etc., which will not be listed here.

[0150] Optionally, two adjacent rotor laminations 10 are bonded together.

[0151] In some embodiments, optionally, such as Figure 3 As shown, on the axial end face of the lamination body 100, the maximum value of the width of the pressure relief hole 400 in the radial direction of the rotor lamination 10 is denoted as H, and the maximum value of the length of the pressure relief hole 400 in the radial direction perpendicular to the rotor lamination 10 is denoted as L.

[0152] Where L / H≥1.

[0153] In this embodiment, the structure of the pressure relief hole 400 is further defined.

[0154] On the axial end face of the lamination body 100, the maximum width of the pressure relief hole 400 in the radial direction of the rotor lamination 10 is H, and the maximum length of the pressure relief hole 400 in the radial direction perpendicular to the rotor lamination 10 is L.

[0155] Where L / H≥1.

[0156] This arrangement ensures that the compressive stress transmitted to the outer edges of the magnet slot group 500 and the rotor lamination 10 is reduced, while maintaining the spacing between the pressure relief hole 400 and the magnet slot group 500 to reduce the impact on the magnetic circuit, and also helps to increase the structural strength and rigidity of the rotor lamination 10.

[0157] like Figure 1 and Figure 2 As shown, a rotor core 1 according to some embodiments of this application includes: a plurality of rotor laminations 10 as in any of the above embodiments.

[0158] Multiple rotor laminations are stacked 10 times.

[0159] Along the axial direction of the rotor core 1, mounting holes 200 of multiple rotor laminations 10 are passed through to form shaft holes 60, weight reduction holes 300 of multiple rotor laminations 10 are passed through to form weight reduction through holes 70, pressure relief holes 400 of multiple rotor laminations 10 are passed through to form pressure relief through holes 80, and magnet slots 500 of multiple rotor laminations 10 are passed through to form slots 90.

[0160] The rotor core 1 provided by this utility model includes multiple rotor laminations 10 as described in any of the above embodiments, and therefore has all the beneficial effects of the rotor laminations 10, which will not be described one by one here.

[0161] Understandably, multiple magnet slots 500 are arranged circumferentially at intervals along the mounting holes 200. Multiple rotor laminations 10 have magnet slots 500 extending axially to form slots 90 for accommodating permanent magnets. Multiple rotor laminations 10 have pressure relief holes 400 extending axially to form pressure relief through holes 80. Multiple rotor laminations 10 have mounting holes 200 extending axially to form shaft holes 60, which are interference-fitted with the shaft 2 of the rotor 3. Multiple rotor laminations 10 have weight reduction holes 300 extending axially to form weight reduction through holes 70.

[0162] In some embodiments, optionally, such as Figure 3 As shown, the magnet slot assembly 500 includes: a plurality of magnet slots 510, which are arranged radially at intervals along the mounting hole 200. Each magnet slot 510 includes two slot bodies 512, and each slot body 512 includes a first end 5122 and a second end 5124. The first end 5122 is closer to the mounting hole 200 than the second end 5124. In the magnet slots 510, the first ends 5122 of the two slot bodies 512 are arranged adjacent to each other, and the second ends 5124 of the two slot bodies 512 are arranged away from each other.

[0163] In this embodiment, the magnet slot assembly 500 includes a plurality of magnet slots 510, which are arranged at radial intervals along the mounting hole 200.

[0164] Each magnet slot 510 includes two slot bodies 512, and each slot body 512 includes a first end 5122 and a second end 5124.

[0165] The distance from the first end 5122 to the mounting hole 200 is less than the distance from the second end 5124 to the mounting hole 200. In the magnet slot 510, the first ends 5122 of the two slots 512 are arranged close to each other, and the second ends 5124 of the two slots 512 are arranged far apart.

[0166] That is, the two slots 512 of each magnet slot 510 are arranged in a V-shape, and the opening of the V-shape faces the outer peripheral wall of the lamination body 100. In other words, the tip of the V-shape faces the mounting hole 200.

[0167] Since the magnetic bridge area near the two slots 512 of each magnet slot 510 is the most dangerous part of the lamination body 100, the stress level is high and the fatigue life is relatively low. Therefore, by reasonably setting the cooperative structure of the pressure relief hole 400, magnet slot group 500, mounting hole 200 and weight reduction hole 300, the deformation of the magnetic bridge area of ​​the lamination body 100 can be ensured to be balanced, so that the stress is relatively uniformly distributed, which can effectively reduce the impact on the magnetic flux distribution on the lamination body 100.

[0168] In some embodiments, optionally, at least a portion of the weight reduction hole 300 is provided in the second portion 140 of the lamination body.

[0169] In this embodiment, the location of the weight reduction hole 300 is further defined, such that at least a portion of the weight reduction hole 300 is located in the second part 140 of the lamination body.

[0170] In this way, the structure of the lamination body 100 is rationally utilized. While ensuring the matching structure of the weight reduction hole 300, the pressure relief hole 400 and the mounting hole 200, it is beneficial to reduce the radial dimension of the lamination body 100 in the rotor lamination 10.

[0171] like Figure 1 , Figure 2 and Figure 4 As shown, according to some embodiments of this application, a rotor 3 includes a shaft 2, a plurality of permanent magnets and the rotor core 1 in the above embodiments.

[0172] The rotating shaft 2 is interference-fitted with the shaft hole 60.

[0173] Multiple permanent magnets are arranged one-to-one in multiple slots 90.

[0174] The rotor 3 provided by this utility model includes the rotor core 1 as described in the above embodiments, and therefore has all the beneficial effects of the rotor core 1, which will not be described in detail here.

[0175] In some embodiments, optionally, such as Figure 4 As shown, the rotating shaft 2 includes a cylindrical section 22.

[0176] The cylindrical section 22 is located between the two axial end faces of the rotating shaft 2. The wall of the mounting hole 200 is an annular wall, and the annular wall is interference-fitted with the cylindrical section 22.

[0177] In this embodiment, the mating structure of the rotating shaft 2 and the rotor core 1 is further defined.

[0178] The rotating shaft 2 includes a cylindrical section 22 located between two axial end faces of the rotating shaft 2. The wall of the mounting hole 200 is an annular wall, which is interference-fitted with the cylindrical section 22. Compared to having keyways on both the rotating shaft and the rotor core, where the keyway and the rotor are fitted together to define the mating dimensions of the rotating shaft and the rotor core, this configuration reduces the machining difficulty of the rotating shaft 2 and the rotor core 1, thus reducing their machining costs. It also avoids dynamic imbalance caused by the fit between the keyway and the rotor core, helps reduce low-order noise during motor operation, and improves product performance and market competitiveness.

[0179] An electric motor according to some embodiments of this application includes: a rotor 3 as described in the above embodiments.

[0180] The motor provided by this utility model includes the rotor 3 as described in the above embodiments, and therefore has all the beneficial effects of the rotor 3, which will not be described in detail here.

[0181] A drive system according to some embodiments of this application includes: a motor as described in the above embodiments.

[0182] The drive system provided by this utility model includes the motor as described in the above embodiments, and therefore has all the beneficial effects of the motor, which will not be described in detail here.

[0183] Optionally, the drive system is used to receive power from the engine to move the vehicle and ensure normal driving.

[0184] A vehicle according to some embodiments of the present application includes: a motor as described in the above embodiments; or a drive system as described in the above embodiments.

[0185] The vehicle provided by this utility model includes a motor as described in the above embodiments, or a drive system as described in the above embodiments. Therefore, it has all the beneficial effects of the motor or drive system described above, which will not be described one by one here.

[0186] It is worth noting that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, and hydrogen engine vehicles.

[0187] Of course, vehicles are not limited to new energy vehicles; they also include gasoline vehicles, diesel vehicles, and hybrid vehicles, etc., which will not be listed here.

[0188] Optionally, the keyway is eliminated in the shaft 2 and rotor core 1 provided in this application, which reduces the processing cost of the shaft 2, avoids the dynamic imbalance caused by the gap fit between the flat key and the keyway, avoids low-order noise during motor operation, and ensures the service life of the processing mold of the rotor lamination 10.

[0189] Multiple pressure relief holes 400 are evenly distributed around the mounting holes 200 of the rotor lamination 10. The deformation of the pressure relief holes 400 can release the compressive stress generated during the interference fit of the shaft 2 and the rotor core 1, and avoid noise caused by the overall deformation of the rotor lamination 10 due to compressive stress.

[0190] like Figure 1 As shown, the rotor 3 includes a shaft 2 and a rotor core 1. The rotor core 1 includes a plurality of rotor laminations 10, which are stacked. Each rotor lamination 10 has a mounting hole 200 for mounting the shaft 2. The shaft 2 includes a mating section (e.g., a cylindrical section 22), and the mounting hole 200 of the rotor laminations 10 is interference-fitted to the mating section of the shaft 2.

[0191] The rotor core 1 and the rotating shaft 2 are coaxially arranged.

[0192] The rotor lamination 10 includes a lamination body 100, which has mounting holes 200, multiple weight reduction holes 300, multiple pressure relief holes 400, and magnet slots 500.

[0193] Multiple weight-reducing holes 300 are arranged at equal intervals along the circumference of the rotor lamination 10, and multiple pressure-relief holes 400 are also arranged at equal intervals along the circumference of the rotor lamination 10. The line connecting the center of the pressure-relief hole 400 and the center of the mounting hole 200 is denoted as the first connecting line 110, and the line connecting the center of the weight-reducing hole 300 and the center of the mounting hole 200 is denoted as the second connecting line 120. The first connecting line 110 and the second connecting line 120 do not coincide.

[0194] The angle between the first line 110 and the second line 120 is equal to 180° / n, where n is the number of rotor poles.

[0195] The diameter of the mounting hole 200 is D1, and the distance from the pressure relief hole 400 to the side of the mounting hole 200 away from the pressure relief hole 400 is D2, wherein 3mm≤D2-D1≤12mm.

[0196] The maximum width of the pressure relief hole 400 in the radial direction of the rotor lamination 10 is H, where H ≥ 2 mm.

[0197] The pressure relief hole 400 has a wall consisting of multiple connecting walls 410 connected end to end. The connection between any two adjacent connecting walls 410 is smooth and the minimum radius of the connection between two adjacent connecting walls 410 is greater than or equal to 1 mm.

[0198] The central angle corresponding to the portion of the lamination body 100 located between two adjacent pressure relief holes 400 is denoted as A1, and the central angle corresponding to the weight reduction hole 300 is denoted as A2, wherein A2 is greater than A1.

[0199] On the axial end face of the lamination body 100, the maximum value of the width of the pressure relief hole 400 in the radial direction of the rotor lamination 10 is denoted as H, and the maximum value of the length of the pressure relief hole 400 in the radial direction perpendicular to the rotor lamination 10 is denoted as L, where L / H≥1.

[0200] like Figure 5 As shown, 27 points were taken at intervals from the mounting hole 200 to the outer edge of the rotor lamination 10. The 7th point is located at the boundary of the pressure relief hole 400. Figure 5 It can be seen that the deformation of the portion of the lamination body 100 located between the pressure relief hole 400 and the outer edge of the lamination body 100 is significantly reduced compared to the deformation of the rotor lamination (which does not have a pressure relief hole) in the related art.

[0201] Each magnet slot assembly 500 is located between the mounting hole 200 and the pressure relief hole 400, thus defining the positional relationship between the magnet slot assembly 500, the mounting hole 200, and the pressure relief hole 400. The distance from the pressure relief hole 400 to the mounting hole 200 is less than the distance from the magnet slot assembly 500 to the mounting hole 200. In other words, the pressure relief hole 400 is closer to the mounting hole 200 than the magnet slot assembly 500, and the pressure relief hole 400 is positioned opposite to the magnet slot assembly 500, and also opposite to the mounting hole 200. The placement of the pressure relief hole 400 effectively reduces the compressive stress transmitted to the outer edges of the magnet slot assembly 500 and rotor lamination 10 during the interference fit between the rotor core 1 and the shaft 2. This compressive stress can be released through deformation of the pressure relief hole 400, preventing overall deformation of the rotor lamination 10 due to compressive stress. This effectively reduces deformation at the outer edges of the magnet slot assembly 500 and rotor lamination 10, ensuring the dimensional integrity of the rotor lamination 10. Consequently, it ensures the clearance between multiple rotor laminations 10 during motor operation, effectively preventing deformation of multiple rotor laminations 10. This reduces vibration and noise during motor operation, effectively suppresses motor performance degradation, and improves product performance and market competitiveness.

[0202] Furthermore, the weight-reducing hole 300 is located between the mating wall 150 and the first portion 130 of the lamination body, that is, it defines the positional relationship between the pressure relief hole 400, the mounting hole 200, and the weight-reducing hole 300. The distance from the pressure relief hole 400 to the mounting hole 200 is less than the distance from the weight-reducing hole 300 to the mounting hole 200. In other words, the pressure relief hole 400 is closer to the mounting hole 200 than the weight-reducing hole 300. The portion of the lamination body 100 between two adjacent pressure relief holes 400 is positioned opposite to the weight-reducing hole 300, and the portion of the lamination body 100 between two adjacent pressure relief holes 400 is positioned opposite to the mounting hole 200. The positioning of the weight-reducing hole 300 effectively reduces the compressive stress transmitted to the first edge when the rotor core 1 and the shaft 2 are interference-fitted. This compressive stress can be released by deformation through the weight-reducing hole 300, avoiding overall deformation of the rotor lamination 10 due to compressive stress. This ensures the external dimensions of the rotor lamination 10, thereby ensuring the gap between multiple rotor laminations 10 during motor operation. It can effectively prevent deformation of multiple rotor laminations 10, thereby reducing vibration and noise during motor operation, effectively suppressing the deterioration of motor performance, and improving the product's performance and market competitiveness.

[0203] The multiple pressure relief holes 400 and multiple weight reduction holes 300 work together to reduce the compressive stress transmitted to the outer edge of the magnet slot group 500 and the rotor lamination 10 from various directions and angles. The compressive stress can be released by deformation through the multiple pressure relief holes 400 and multiple weight reduction holes 300.

[0204] In this application, the term "multiple" refers to two or more unless otherwise expressly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0205] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A rotor lamination, characterized in that, include: The lamination body is provided with mounting holes, multiple weight reduction holes, multiple pressure relief holes, and multiple magnet slots; Multiple magnet slots are arranged at circumferential intervals along the mounting holes; Each of the magnet slots is located between the mounting hole and the pressure relief hole; The portion of the lamination body located between two adjacent pressure relief holes is the first portion of the lamination body; the portion of the lamination body located between two adjacent magnet slots is the second portion of the lamination body; and the portion of the outer peripheral wall of the lamination body that is opposite to the second portion of the lamination body is the mating wall of the lamination body. The weight reduction hole is located between the mating wall and the first part of the lamination body.

2. The rotor lamination according to claim 1, characterized in that, Along the circumferential direction of the rotor lamination, the wall of the weight reduction hole includes a first wall surface and a second wall surface disposed opposite to each other; In two adjacent pressure relief holes, the first wall surface of the weight reduction hole is disposed opposite to one of the pressure relief holes, and the second wall surface of the weight reduction hole is disposed opposite to the other pressure relief hole.

3. The rotor lamination according to claim 1 or 2, characterized in that, The plurality of weight-reducing holes and the plurality of pressure-relief holes are arranged at circumferential intervals along the mounting holes.

4. The rotor lamination according to claim 3, characterized in that, In the pressure relief hole and the two adjacent weight reduction holes, the line connecting the center of the pressure relief hole and the center of the mounting hole is called the first line, and the line connecting the center of the weight reduction hole and the center of the mounting hole is called the second line. The first line is located between the two second lines.

5. The rotor lamination according to claim 4, characterized in that, The angle between the first connecting line and the second connecting line is equal to 180° / n, where n is the number of rotor poles.

6. The rotor lamination according to claim 1 or 2, characterized in that, The distance from the pressure relief hole to the mounting hole is greater than or equal to 3 mm and less than or equal to 12 mm.

7. The rotor lamination according to claim 1 or 2, characterized in that, The maximum width of the pressure relief hole in the radial direction of the rotor lamination is greater than or equal to 2 mm.

8. The rotor lamination according to claim 1 or 2, characterized in that, The pressure relief hole wall includes multiple connecting walls connected end to end, with a smooth transition at the connection between any two adjacent connecting walls, and the minimum radius of the connection between two adjacent connecting walls is greater than or equal to 1 mm.

9. The rotor lamination according to claim 1 or 2, characterized in that, On the axial end face of the lamination body, the maximum value of the width of the pressure relief hole in the radial direction of the rotor lamination is denoted as H, and the maximum value of the length of the pressure relief hole in the radial direction perpendicular to the rotor lamination is denoted as L, where L / H≥1.

10. The rotor lamination according to claim 1 or 2, characterized in that, The magnet slot assembly includes: Multiple magnet slots are arranged radially spaced along the mounting hole. Each magnet slot includes two slot bodies, and each slot body includes a first end and a second end, wherein the first end is closer to the mounting hole than the second end. In the magnet slot, the first ends of the two slots are arranged close to each other, and the second ends of the two slots are arranged far apart.

11. The rotor lamination according to claim 1 or 2, characterized in that, At least a portion of the weight-reducing holes are located in the second part of the lamination body.

12. A rotor core, characterized in that, include: A plurality of rotor laminations as described in any one of claims 1 to 11, wherein the plurality of rotor laminations are stacked; Along the axial direction of the rotor core, mounting holes of a plurality of rotor laminations are connected to form shaft holes, weight reduction holes of a plurality of rotor laminations are connected to form weight reduction through holes, pressure relief holes of a plurality of rotor laminations are connected to form pressure relief through holes, and magnet slots of a plurality of rotor laminations are connected to form slots.

13. A rotor, characterized in that, include: Shaft; Multiple permanent magnets; and As described in claim 12, the rotor core has an interference fit between the rotating shaft and the shaft hole, and the plurality of permanent magnets are arranged one-to-one in the plurality of slots.

14. The rotor according to claim 13, characterized in that, The rotating shaft includes a cylindrical section located between two axial end faces of the rotating shaft. The wall of the mounting hole is an annular wall, and the annular wall is interference-fitted with the cylindrical section.

15. An electric motor, characterized in that, include: The rotor as described in claim 13 or 14.

16. A drive system, characterized in that, include: The motor as described in claim 15.

17. A vehicle, characterized in that, include: The motor as described in claim 15; or The drive system as described in claim 16.

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