Rotor lamination, rotor core, rotor, electric machine and vehicle

Abstract

The application provides a rotor lamination, a rotor core, a rotor, a motor and a vehicle, wherein the rotor lamination comprises: a lamination body having a first end face and a second end face along the axial direction of the rotor lamination; a shaft hole penetrating through the first end face and the second end face; a positioning protrusion arranged on the hole wall of the shaft hole; a recess connected between the positioning protrusion and the hole wall of the shaft hole and extending along the circumferential direction of the shaft hole, the recess comprises a plurality of connected circular arc segments, the circular arc segments extend from the first end face to the second end face, a circular arc segment close to the positioning protrusion in the plurality of circular arc segments is recorded as a first circular arc segment, and a circular arc segment connected to the first circular arc segment and away from the positioning protrusion is recorded as a second circular arc segment; the radius Ra of the first circular arc is smaller than the radius Rb of the second circular arc segment; and the distance La from the center of the first circular arc segment to a preset plane is smaller than the distance Lb from the center of the second circular arc segment to the preset plane.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and more specifically, to a rotor lamination, a rotor core, a rotor, an electric motor, and a vehicle. Background Technology

[0002] In related technologies, the rotor core includes a flat key, which mates with the shaft.

[0003] As rotor speed increases, the centrifugal load on the rotor also increases. Furthermore, as rotor power density increases, the peak rotor torque also increases. Inside the rotor, it is subjected to both centrifugal loads generated by the rotational speed and compressive loads generated by torque transmission. At the root of the flat key inside the rotor core, where it contacts the shaft, it experiences both centrifugal tensile stress and localized compressive stress generated by torsion transmission. This high stress level fails to meet the design requirements for a long rotor life. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] Therefore, a rotor lamination is proposed as a first aspect of the present invention.

[0006] A second aspect of the present invention provides a rotor core.

[0007] A third aspect of the invention provides a rotor.

[0008] A fourth aspect of the present invention provides an electric motor.

[0009] The fifth aspect of the present invention provides a vehicle.

[0010] In view of this, a first aspect of the present invention provides a rotor lamination, comprising: a lamination body having a first end face and a second end face along the axial direction of the rotor lamination; a shaft hole penetrating the first end face and the second end face; a positioning protrusion disposed on the wall of the shaft hole; and a recess connecting the positioning protrusion and the wall of the shaft hole. Along the circumferential direction of the shaft hole, the recess includes a plurality of connected arc segments extending from the first end face to the second end face. The arc segment closest to the positioning protrusion among the plurality of arc segments is designated as the first arc segment. The arc segment of the first arc segment that is away from the positioning protrusion is referred to as the second arc segment; either the first arc segment or the second arc segment bends toward the outer peripheral wall of the stamping body; the radius Ra of the first arc segment is less than the radius Rb of the second arc segment; the distance La from the center of the first arc segment to the preset plane is less than the distance Lb from the center of the second arc segment to the preset plane; wherein, the outer surface of the positioning protrusion includes an outer peripheral segment on the axial end face, the preset plane passes through the midpoint of the outer peripheral segment and the axis of the shaft hole, and the outer peripheral segment is perpendicular to the preset plane.

[0011] The present invention provides a rotor lamination comprising a lamination body, a shaft hole, a positioning protrusion, and a recess.

[0012] The lamination body includes a first end face and a second end face, which are arranged at intervals along the axial direction of the rotor lamination, and the shaft hole passes through the first end face and the second end face.

[0013] A positioning protrusion is provided on the wall of the shaft hole, extending from the first end face to the second end face. The rotor includes a rotor core and a shaft. The rotor core includes multiple rotor laminations. When the rotor core and the shaft are assembled, the positioning protrusion can be inserted into the mounting slot.

[0014] By rationally designing the rotor lamination structure, the recess connects between the positioning protrusion and the wall of the shaft hole. The recess includes multiple connected arc segments in the circumferential direction of the shaft hole. At least a portion of these arc segments are divided, with the arc segment closer to the positioning protrusion designated as the first arc segment, and the arc segment connecting the first arc segment and moving away from the positioning protrusion designated as the second arc segment. That is, the first arc segment is located between the second arc segment and the positioning protrusion.

[0015] Furthermore, the mating dimensions of the first and second arc segments are defined such that the radius Ra of the first arc is smaller than the radius Rb of the second arc segment, and the distance La from the center of the first arc segment to the preset plane is smaller than the distance Lb from the center of the second arc segment to the preset plane. In other words, the structure of the lamination body at the root of the positioning protrusion is altered. This design achieves a gradual change in stiffness of the rotor lamination at the positioning protrusion, thereby enabling the rotor to meet the low-stress design requirements under the combined action of centrifugal and torque loads during operation, and ultimately meeting the requirements for a long rotor lifespan.

[0016] This design significantly reduces the root stress level of the positioning protrusions of the rotor laminations without altering the original electromagnetic properties of the rotor core. This ensures that the stress and fatigue life of the rotor laminations meet usage requirements, thereby improving product performance and market competitiveness. Simultaneously, it allows for the platform-based design of rotor cores with high speed and high torque under different design requirements.

[0017] Understandably, both the first and second arc segments bend towards the outer peripheral wall of the lamination body. That is, along the radial direction of the rotor lamination, the first arc segment is closer to the outer peripheral wall of the lamination body than the side of the locating protrusion away from the shaft hole. After the shaft and rotor core are assembled, the first and second arc segments together create a space to avoid contact with the shaft. The shaft will not contact the recess, and there is no interference between the recess and the mounting groove and locating protrusion of the shaft. In other words, the outer side of the mounting groove of the shaft has no contact or interference with the root of the locating protrusion.

[0018] According to the rotor laminations described above, the present invention may also have the following additional technical features:

[0019] In the above technical solution, further, along the circumferential direction of the shaft hole, the arc length of the first arc segment is smaller than the arc length of the second arc segment.

[0020] In this technical solution, the mating dimensions of the first and second arc segments are further defined, so that the arc length of the first arc segment is less than the arc length of the second arc segment along the circumference of the shaft hole. This setting makes the stiffness transition at the root of the positioning protrusion smoother, which can greatly alleviate the high stress concentration phenomenon at the root of the positioning protrusion, thereby simultaneously meeting the stress and torque transmission requirements of the high-speed rotor.

[0021] Specifically, the number of arc segments is greater than or equal to 2.

[0022] In any of the above technical solutions, further, the distance from the axis of the shaft hole to the center of the second arc segment is Hb, and the radius of the shaft hole is Ri, wherein...

[0023] In this technical solution, the mating structure of the shaft hole and the second arc segment is further defined such that the distance from the axis of the shaft hole to the center of the second arc segment is Hb, the radius of the shaft hole is Ri, and the values ​​of Hb and Ri satisfy the following conditions: This design can balance the smooth transition of stiffness at the root of the positioning protrusion with the mating area between the shaft and the stator core.

[0024] Understandably, the smaller the Hb value, the larger the radius of the second arc segment, the smoother the structure at the root of the positioning protrusion, and the better the stiffness transition. However, this reduces the area of ​​the shaft hole wall, resulting in a smaller contact area between the shaft and the rotor core. Consequently, this reduces the stability and reliability of the assembly of the shaft and the rotor core.

[0025] Therefore, this application reasonably limits the fitting dimensions of the shaft hole and the second arc segment, which can ensure the assembly stability of the shaft and the rotor core while meeting the low stress design requirements of the rotor under the combined action of centrifugal force load and torque load.

[0026] Specifically, The values ​​include 0.6, 0.7, 0.8, and 0.9, etc., which will not be listed here.

[0027] In any of the above technical solutions, the arc segment closest to the hole wall of the shaft hole among the multiple arc segments is referred to as the third arc segment, and the third arc segment bends toward the axis of the shaft hole.

[0028] In this technical solution, by rationally setting up a structure with multiple arc segments, the arc segment closest to the hole wall of the shaft hole is designated as the third arc segment. This third arc segment bends towards the axis of the shaft hole, while the first and second arc segments both bend towards the outer peripheral wall of the lamination body. That is, the first and third arc segments bend in opposite directions, as do the second and third arc segments. The third arc segment ensures a smooth transition at the connection between the recess and the hole wall of the shaft hole, avoiding the formation of sharp corners and preventing the shaft from contacting the recess. Furthermore, there is no interference between the recess and the mounting groove and positioning protrusion of the shaft.

[0029] In any of the above technical solutions, further, along the circumferential direction of the shaft hole, the arc length of either the first arc segment or the second arc segment is greater than the arc length of the third arc segment.

[0030] In this technical solution, the mating structure of the first, second, and third circular arc segments is further defined. Specifically, along the circumference of the shaft hole, the arc length of the first circular arc segment is greater than that of the third circular arc segment, and the arc length of the second circular arc segment is greater than that of the third circular arc segment. That is, along the circumference of the shaft hole, the arc lengths of both the first and second circular arc segments are greater than the arc length of the third circular arc segment. The smaller arc length of the third circular arc segment, while avoiding the formation of sharp corners at the connection between the recess and the shaft hole wall, increases the contact area and contact angle between the rotor core and the shaft, ensuring the mating stability of the rotor core and shaft, and thus contributing to the rotor's torque transmission capability.

[0031] In any of the above technical solutions, further, along the circumferential direction of the shaft hole, the positioning protrusion has a first side surface and a second side surface, either the first side surface or the second side surface is perpendicular to the outer peripheral segment, and the distance from the first side surface to the second side surface is W; the radius of the third arc segment is Rc, and the distance from the axis of the shaft hole to the center of the first arc segment is Ha; wherein, Ra≤Rb, La≤Lb, Hb=k4×Ri, 1≤k1≤2.5, 1.5≤k2≤2.5, 0.1≤k3≤3, 0.3<k4<1.

[0032] In this technical solution, the positioning protrusion has a first side surface and a second side surface, which are arranged at intervals in the circumferential direction of the shaft hole. The first side surface is perpendicular to the outer peripheral section of the positioning protrusion, and the second side surface is perpendicular to the outer peripheral section of the positioning protrusion. Alternatively, the first side surface is perpendicular to the side of the positioning protrusion facing the axis of the shaft hole, and the second side surface is perpendicular to the side of the positioning protrusion facing the axis of the shaft hole.

[0033] Furthermore, the mating dimensions of the recess, the positioning protrusion, and the shaft hole are defined such that the distance W from the first side to the second side, the radius Ra of the first arc, the radius Rb of the second arc segment, the radius Rc of the third arc segment, the distance Ha from the axis of the shaft hole to the center of the first arc segment, the distance Hb from the axis of the shaft hole to the center of the second arc segment, the distance La from the center of the first arc segment to the preset plane, and the distance Lb from the center of the second arc segment to the preset plane satisfy the following: Ra≤Rb, La≤Lb, Hb=k4×Ri, 1≤k1≤2.5, 1.5≤k2≤2.5, 0.1≤k3≤3, 0.3<k4<1. This configuration ensures uniform deformation and stress distribution of the rotor core under centrifugal load, alleviating stress concentration issues on the rotor core. While achieving low-stress design, this structure ensures no structural interference between the mounting groove and the positioning protrusion on the shaft; that is, the outer side of the mounting groove on the shaft does not contact the root of the positioning protrusion. Furthermore, this structural design guarantees an effective contact area between the rotor core and the shaft, ensuring low-stress design requirements at the positioning protrusion of the rotor core after the initial assembly load is applied.

[0034] Specifically, the rotor laminations of this application are directly compatible with design requirements for different inner diameters, peak torques, and peak speeds. By adjusting coefficients k1, k2, k3, and k4, the usage requirements of motors with different speeds can be met, achieving platform compatibility. This enables the design requirements of low stress, long lifespan, cooling, and installation positioning for rotor cores with different inner diameters to be met.

[0035] In any of the above technical solutions, the number of any one of the positioning protrusions and recesses is multiple, with each positioning protrusion located between two recesses; wherein, the multiple positioning protrusions are arranged at intervals along the circumferential direction of the shaft hole.

[0036] In this technical solution, the mating structure of the positioning protrusions and recesses is further defined. There are multiple positioning protrusions and multiple recesses, with the multiple positioning protrusions arranged at intervals along the circumference of the shaft hole, and each positioning protrusion located between two recesses.

[0037] Multiple positioning protrusions are evenly distributed on the wall of the shaft hole.

[0038] In any of the above technical solutions, the rotor lamination further includes: multiple slot groups disposed on the lamination body, the multiple slot groups being arranged at intervals around the shaft hole, each slot group including multiple permanent magnet slots, the multiple permanent magnet slots being arranged at radial intervals along the shaft hole, each permanent magnet slot including two slot bodies, each slot body including a first end and a second end, the first end being closer to the shaft hole than the second end; the first ends of the two slot bodies of each permanent magnet slot being arranged adjacent to each other, the second ends of the two slot bodies of each permanent magnet slot being arranged far apart; and a positioning protrusion being arranged correspondingly to the two first ends of the permanent magnet slot.

[0039] In this technical solution, the rotor lamination also includes multiple slot groups, each slot group comprising multiple permanent magnet slots. Each permanent magnet slot includes two slot bodies, each slot body including a first end and a second end. The first ends of the two slot bodies of each permanent magnet slot are arranged adjacent to each other, while the second ends of the two slot bodies of each permanent magnet slot are arranged away from each other. That is, the two slot bodies of each permanent 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 shaft hole.

[0040] The positioning protrusion and the two first ends of the permanent magnet slot are correspondingly positioned, thus defining the mating structure between the positioning protrusion and the permanent magnet slot. When machining the rotor laminations, the permanent magnet slot can serve as a reference for machining the positioning protrusion, reducing the machining difficulty of the rotor laminations. This provides structural assurance for the effective assembly of multiple rotor laminations to form the rotor core.

[0041] Understandably, the portion of the lamination body located at the two first ends of the permanent magnet slot constitutes the positioning area. The positioning protrusion of one of the multiple rotor laminations forming the rotor core is located directly below the positioning area of ​​a permanent magnet slot. The positioning protrusions of the remaining rotor laminations are offset at different angles relative to the positioning area.

[0042] In any of the above technical solutions, the rotor lamination further includes: a plurality of first weight-reducing holes, wherein at least one first weight-reducing hole is provided in the portion of the lamination body located between any two adjacent slot groups; a plurality of second weight-reducing holes, wherein at least one second weight-reducing hole is provided in the portion of the lamination body located between the shaft hole and each slot group; wherein the positioning protrusion is located between the second weight-reducing hole and the shaft hole.

[0043] In this technical solution, the rotor lamination also includes multiple first weight reduction holes and multiple second weight reduction holes.

[0044] The portion of the lamination body located between any two adjacent slot groups is provided with at least one first weight reduction hole, and the portion of the lamination body located between the shaft hole and each slot group is provided with at least one second weight reduction hole.

[0045] The placement of the first weight-reduction hole reduces the weight of the lamination body, and the alignment of the first weight-reduction hole, the permanent magnet slot, and the shaft hole ensures the uniformity of regional deformation of the lamination body, resulting in a relatively uniform stress distribution. This keeps the total stress level relatively low. Simultaneously, the weight-reduction area where the first weight-reduction hole is located has minimal impact on the magnetic flux distribution on the lamination body, thus not affecting the original electromagnetic properties of the lamination body. In other words, while meeting weight reduction requirements, the requirements for rotor stress and fatigue life are also satisfied.

[0046] Since the magnetic bridge region near the two slots of each permanent 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 the second weight-reducing hole, shaft hole, permanent magnet slot and first weight-reducing hole, the deformation of the magnetic bridge region 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.

[0047] Furthermore, the positioning protrusion is located between the second weight-reducing hole and the shaft hole, defining the mating structure of the positioning protrusion and the second weight-reducing hole. During rotor lamination machining, the second weight-reducing hole can serve as a reference for machining the positioning protrusion, reducing the machining difficulty of the rotor laminations. This provides structural assurance for the effective assembly of multiple rotor laminations to form the rotor core.

[0048] In any of the above technical solutions, the rotor lamination further includes: at least one positioning groove provided on the wall of the shaft hole.

[0049] In this technical solution, by reasonably setting the structure of the rotor lamination, the rotor lamination also includes at least one positioning groove. The positioning groove is located on the wall of the shaft hole and has a positioning function. In this way, it can be used as a positioning reference for processing the rotor lamination and can ensure the matching dimensions of the multiple rotor laminations that make up the rotor core.

[0050] In any of the above technical solutions, the rotor lamination further includes: a plurality of arc-cut grooves, which are distributed circumferentially along the shaft hole on the outer peripheral wall of the lamination body; and a plurality of snap-fit ​​parts, which are provided on the lamination body and are used for the installation and positioning of the lamination body.

[0051] In this technical solution, the rotor lamination also includes multiple serrated grooves, which are distributed circumferentially along the shaft hole on the outer peripheral wall of the lamination body.

[0052] Rotor laminations are used in motors, and the torque ripple of the motor is related to the non-sinusoidal air gap magnetic field. The higher the harmonic content in the air gap magnetic field, the worse the output torque waveform of the motor, the greater the ripple, and the greater the NVH (Noise, Vibration, and Harshness).

[0053] Therefore, multiple arc-cut grooves are distributed circumferentially along the outer peripheral wall of the lamination body. This effectively reduces the harmonic content in the air gap magnetic field, thereby improving the sinusoidality of the air gap magnetic flux density waveform, improving the torque pulsation of the motor, reducing the radial force caused by harmonics, reducing the operating noise of the motor, and improving NVH performance, so as to enhance the performance and market competitiveness of the product.

[0054] The arc-cutting groove not only effectively improves the motor's output performance but also helps reduce motor costs. Simultaneously, the arc-cutting groove can partially adjust the no-load back EMF waveform and radial force, reducing the motor's maximum no-load line back EMF and lowering controller costs. Without changing the motor's average air gap length and ensuring no reduction in output torque, it effectively improves the air gap magnetic field, increasing the air gap magnetic flux density and the sinusoidal nature of the back EMF waveform, reducing harmonic content, and thus reducing torque ripple, significantly lowering motor vibration and noise.

[0055] Furthermore, multiple snap-fit ​​parts are provided on the lamination body, allowing any two adjacent rotor laminations to be assembled together. In other words, multiple snap-fit ​​parts can assemble multiple lamination bodies together. This design ensures the stability of the assembly of any two adjacent rotor laminations while increasing the mating area between them, enabling multi-directional and multi-angle limiting functions. This improves the effectiveness and feasibility of assembling multiple rotor laminations and prevents them from scattering. Additionally, this design achieves proper positioning between the multiple rotor laminations, preventing relative movement between any two adjacent laminations. This avoids potential misalignment of the rotor laminations during operation and contributes to improving the overall stability of the rotor.

[0056] According to a second aspect of the present invention, a rotor core is provided, comprising: a plurality of rotor laminations as described in any of the technical solutions in the first aspect, wherein the plurality of rotor laminations are stacked.

[0057] The rotor core provided by the present invention includes rotor laminations as described in any of the technical solutions in the first aspect, and therefore has all the beneficial effects of the aforementioned rotor laminations, which will not be described in detail here.

[0058] Specifically, the positioning protrusions of multiple rotor laminations are arranged along the axial direction of the lamination body, and the positioning protrusions of multiple rotor laminations together form a flat key structure.

[0059] According to a third aspect of the invention, a rotor is provided, comprising: a shaft having a mounting groove; and a rotor core as in the second aspect, wherein a portion of the shaft is located within a shaft hole and a positioning protrusion is capable of being inserted into the mounting groove.

[0060] The rotor provided by the present invention includes a rotor core as described in the second aspect, and therefore has all the beneficial effects of the rotor core described above, which will not be described in detail here.

[0061] In the above technical solution, the mounting groove further engages with the positioning protrusion of each rotor lamination so that any two adjacent rotor laminations are staggered in the circumferential direction of the rotating shaft.

[0062] In this technical solution, by reasonably setting the matching structure of the rotating shaft and multiple rotor laminations, the mounting groove matches the positioning protrusion of each rotor lamination, so that any two adjacent rotor laminations are staggered in the circumferential direction of the rotating shaft.

[0063] The rotor is used in electric motors. Any two adjacent rotor laminations are staggered circumferentially around the shaft; that is, the rotor is segmented with skewed poles, and any two adjacent rotor laminations have a relative rotational angle. This allows the harmonic magnetic fields on different rotor laminations to partially cancel each other out, suppressing harmonic components of specific octaves in the motor, effectively reducing noise during operation, and improving product performance and market competitiveness.

[0064] Specifically, multiple rotor laminations are stacked along the axial direction of the rotor shaft, with the outer peripheral walls of all rotor laminations completely overlapping. This stacked assembly arrangement can reduce eddy current losses in the rotor core.

[0065] According to a fourth aspect of the present invention, an electric motor is provided, comprising: a rotor as described in any of the technical solutions in the third aspect.

[0066] The motor provided by the present invention includes a rotor as described in any of the technical solutions in the third aspect, and therefore has all the beneficial effects of the rotor described above, which will not be described one by one here.

[0067] According to a fifth aspect of the invention, a vehicle is provided, comprising: an electric motor as described in the fourth aspect.

[0068] The vehicle provided by the present invention includes an electric motor as described in the fourth aspect, and therefore has all the beneficial effects of the aforementioned electric motor, which will not be described in detail here.

[0069] 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.

[0070] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0071] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0072] Figure 1 A partial structural schematic diagram of a rotor according to an embodiment of the present invention is shown;

[0073] Figure 2 A schematic diagram of the rotor core according to an embodiment of the present invention is shown;

[0074] Figure 3 A schematic diagram of the rotor lamination structure according to an embodiment of the present invention is shown;

[0075] Figure 4 A schematic diagram of the structure of the first part of the rotor lamination according to an embodiment of the present invention is shown;

[0076] Figure 5 A schematic diagram of the structure of the second part of the rotor lamination according to an embodiment of the present invention is shown;

[0077] Figure 6 for Figure 5 A magnified view of part A of the rotor lamination shown;

[0078] Figure 7 A schematic diagram of the stress distribution gradient of the positioning protrusion of the rotor core under centrifugal force and torque load according to an embodiment of the present invention is shown.

[0079] in, Figures 1 to 7 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0080] 100 Rotor lamination, 110 Lamination body, 112 First end face, 114 Second end face, 120 Shaft hole, 130 Positioning protrusion, 132 First side face, 134 Second side face, 136 Outer periphery, 140 Recess, 142 First arc segment, 144 Second arc segment, 146 Third arc segment, 150 Preset plane, 158 Slot group, 160 Permanent magnet slot, 162 Slot body, 164 First end, 166 Second end, 170 First weight reduction hole, 180 Second weight reduction hole, 190 Positioning slot, 200 Curved groove, 210 Snap-fit ​​part, 300 Rotor core, 400 Rotor, 410 Shaft, 412 Mounting slot. Detailed Implementation

[0081] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention 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.

[0082] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0083] The following reference Figures 1 to 7 The invention describes a rotor lamination 100, a rotor core 300, a rotor, a motor, and a vehicle according to some embodiments of the invention.

[0084] Example 1:

[0085] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, an embodiment of the first aspect of the present invention provides a rotor lamination 100, which includes a lamination body 110, a shaft hole 120, a positioning protrusion 130, and a recess 140.

[0086] Along the axial direction of the rotor lamination 100, the lamination body 110 has a first end face 112 and a second end face 114.

[0087] The shaft hole 120 passes through the first end face 112 and the second end face 114.

[0088] The positioning protrusion 130 is provided on the hole wall of the shaft hole 120.

[0089] The recess 140 is connected between the positioning protrusion 130 and the hole wall of the shaft hole 120. Along the circumference of the shaft hole 120, the recess 140 includes a plurality of connected arc segments. The arc segments extend from the first end face 112 to the second end face 114. Among the plurality of arc segments, the arc segment closer to the positioning protrusion 130 is referred to as the first arc segment 142, and the arc segment connected to the first arc segment 142 away from the positioning protrusion 130 is referred to as the second arc segment 144.

[0090] Either the first arc segment 142 or the second arc segment 144 bends toward the outer peripheral wall of the stamping body 110.

[0091] The radius Ra of the first arc is smaller than the radius Rb of the second arc segment 144.

[0092] The distance La from the center of the first arc segment 142 to the preset plane 150 is less than the distance Lb from the center of the second arc segment 144 to the preset plane 150.

[0093] The outer surface of the positioning protrusion 130 includes an outer peripheral section 136 on the axial end face, and the preset plane 150 passes through the midpoint of the outer peripheral section 136 and the axis of the shaft hole 120, and the outer peripheral section 136 is perpendicular to the preset plane 150.

[0094] In detail, the rotor lamination 100 includes a lamination body 110, a shaft hole 120, a positioning protrusion 130, and a recess 140.

[0095] The lamination body 110 includes a first end face 112 and a second end face 114. The first end face 112 and the second end face 114 are arranged at intervals along the axial direction of the rotor lamination 100, and the shaft hole 120 passes through the first end face 112 and the second end face 114.

[0096] A positioning protrusion 130 is provided on the wall of the shaft hole 120, and the positioning protrusion 130 extends from the first end face 112 to the second end face 114. The rotor includes a rotor core 300 and a rotating shaft 410. The rotor core 300 includes a plurality of rotor laminations 100. When the rotor core 300 and the rotating shaft 410 are assembled, the positioning protrusion 130 can be inserted into the mounting groove 412.

[0097] By rationally configuring the structure of the rotor lamination 100, the recess 140 is connected between the positioning protrusion 130 and the wall of the shaft hole 120. The recess 140 includes multiple connected arc segments in the circumferential direction of the shaft hole 120. At least a portion of these arc segments are divided, such that the arc segment closer to the positioning protrusion 130 is designated as the first arc segment 142, and the arc segment connecting to the first arc segment 142 and away from the positioning protrusion 130 is designated as the second arc segment 144. That is, the first arc segment 142 is located between the second arc segment 144 and the positioning protrusion 130.

[0098] Furthermore, the mating dimensions of the first arc segment 142 and the second arc segment 144 are defined such that the radius Ra of the first arc is smaller than the radius Rb of the second arc segment 144, and the distance La from the center of the first arc segment 142 to the preset plane 150 is smaller than the distance Lb from the center of the second arc segment 144 to the preset plane 150. In other words, the structure of the lamination body 110 at the root of the positioning protrusion 130 is changed. This configuration achieves a gradual change in stiffness of the rotor lamination 100 at the positioning protrusion 130, thereby enabling the rotor to meet the low-stress design requirements under the combined action of centrifugal force and torque loads during operation, and thus meeting the requirements for a long rotor lifespan.

[0099] This design significantly reduces the root stress level of the positioning protrusion 130 of the rotor lamination 100 without altering the original electromagnetic properties of the rotor core 300. This ensures that the stress and fatigue life of the rotor lamination 100 meet usage requirements, thereby improving product performance and market competitiveness. Simultaneously, it allows for the platform-based design of the rotor core 300 under different design requirements, accommodating high-speed and high-torque needs.

[0100] Understandably, the first arc segment 142 bends towards the outer peripheral wall of the lamination body 110, and the second arc segment 144 bends towards the outer peripheral wall of the lamination body 110. That is, along the radial direction of the rotor lamination 100, the first arc segment 142 is closer to the outer peripheral wall of the lamination body 110 than the side of the positioning protrusion 130 that is away from the shaft hole 120. After the shaft 410 and the rotor core 300 are assembled, the first arc segment 142 and the second arc segment 144 enclose a space for avoiding the shaft 410. The shaft 410 will not contact the recess 140, and the recess 140 does not interfere with the mounting groove 412 and the positioning protrusion 130 of the shaft 410. That is, the outer side of the mounting groove 412 of the shaft 410 does not contact or interfere with the root of the positioning protrusion 130.

[0101] Figure 7 The stress gradient distribution of the positioning protrusion 130 of the rotor lamination 100 of this application under centrifugal load and torque load is shown. High stress is uniformly distributed in the area near the positioning protrusion 130, and the stress level at the positioning protrusion 130 is low.

[0102] Example 2:

[0103] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, based on Embodiment 1, Embodiment 2 provides a rotor lamination 100, which includes a lamination body 110, a shaft hole 120, a positioning protrusion 130, and a recess 140.

[0104] Along the axial direction of the rotor lamination 100, the lamination body 110 has a first end face 112 and a second end face 114.

[0105] The shaft hole 120 passes through the first end face 112 and the second end face 114.

[0106] The positioning protrusion 130 is provided on the hole wall of the shaft hole 120.

[0107] The recess 140 is connected between the positioning protrusion 130 and the hole wall of the shaft hole 120. Along the circumference of the shaft hole 120, the recess 140 includes a plurality of connected arc segments. The arc segments extend from the first end face 112 to the second end face 114. Among the plurality of arc segments, the arc segment closer to the positioning protrusion 130 is referred to as the first arc segment 142, and the arc segment connected to the first arc segment 142 away from the positioning protrusion 130 is referred to as the second arc segment 144.

[0108] Either the first arc segment 142 or the second arc segment 144 bends toward the outer peripheral wall of the stamping body 110.

[0109] The radius Ra of the first arc is smaller than the radius Rb of the second arc segment 144.

[0110] The distance La from the center of the first arc segment 142 to the preset plane 150 is less than the distance Lb from the center of the second arc segment 144 to the preset plane 150.

[0111] The outer surface of the positioning protrusion 130 includes an outer peripheral section 136 on the axial end face, and the preset plane 150 passes through the midpoint of the outer peripheral section 136 and the axis of the shaft hole 120, and the outer peripheral section 136 is perpendicular to the preset plane 150.

[0112] Furthermore, along the circumference of the shaft hole 120, the arc length of the first arc segment 142 is less than the arc length of the second arc segment 144.

[0113] In detail, the mating dimensions of the first arc segment 142 and the second arc segment 144 are further defined, such that the arc length of the first arc segment 142 is less than the arc length of the second arc segment 144 along the circumference of the shaft hole 120. This setting makes the stiffness transition at the root of the positioning protrusion 130 smoother, which can greatly alleviate the high stress concentration phenomenon at the root of the positioning protrusion 130, thereby simultaneously meeting the stress and torque transmission requirements of the high-speed rotor.

[0114] Specifically, the number of arc segments is greater than or equal to 2.

[0115] When there are two arc segments, the two arc segments are respectively denoted as the first arc segment 142 and the second arc segment 144.

[0116] When there are multiple arc segments, the multiple arc segments include the first arc segment 142, the second arc segment 144 and other arc segments.

[0117] Example 3:

[0118] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, based on Embodiment 1 or Embodiment 2, Embodiment 3 provides a rotor lamination 100, which includes a lamination body 110, a shaft hole 120, a positioning protrusion 130, and a recess 140.

[0119] Along the axial direction of the rotor lamination 100, the lamination body 110 has a first end face 112 and a second end face 114.

[0120] The shaft hole 120 passes through the first end face 112 and the second end face 114.

[0121] The positioning protrusion 130 is provided on the hole wall of the shaft hole 120.

[0122] The recess 140 is connected between the positioning protrusion 130 and the hole wall of the shaft hole 120. Along the circumference of the shaft hole 120, the recess 140 includes a plurality of connected arc segments. The arc segments extend from the first end face 112 to the second end face 114. Among the plurality of arc segments, the arc segment closer to the positioning protrusion 130 is referred to as the first arc segment 142, and the arc segment connected to the first arc segment 142 away from the positioning protrusion 130 is referred to as the second arc segment 144.

[0123] Either the first arc segment 142 or the second arc segment 144 bends toward the outer peripheral wall of the stamping body 110.

[0124] The radius Ra of the first arc is smaller than the radius Rb of the second arc segment 144.

[0125] The distance La from the center of the first arc segment 142 to the preset plane 150 is less than the distance Lb from the center of the second arc segment 144 to the preset plane 150.

[0126] The outer surface of the positioning protrusion 130 includes an outer peripheral section 136 on the axial end face, and the preset plane 150 passes through the midpoint of the outer peripheral section 136 and the axis of the shaft hole 120, and the outer peripheral section 136 is perpendicular to the preset plane 150.

[0127] Furthermore, such as Figure 5 As shown, the distance from the axis of the shaft hole 120 to the center of the second circular arc segment 144 is Hb, and the radius of the shaft hole 120 is Ri.

[0128] In detail, the mating structure of the shaft hole 120 and the second arc segment 144 is further defined such that the distance from the axis of the shaft hole 120 to the center of the second arc segment 144 is Hb, the radius of the shaft hole 120 is Ri, and the values ​​of Hb and Ri satisfy the following conditions: This design can balance the smooth transition of rigidity at the root of the positioning protrusion 130 with the mating area between the rotating shaft 410 and the stator core.

[0129] Understandably, the smaller the value of Hb, the larger the radius of the second arc segment 144, the smoother the structure at the root of the positioning protrusion 130, and the better the stiffness transition. However, this reduces the area of ​​the hole wall of the shaft hole 120, thus reducing the contact area between the rotating shaft 410 and the rotor core 300. This, in turn, reduces the stability and reliability of the assembly of the rotating shaft 410 and the rotor core 300.

[0130] Therefore, this application reasonably limits the mating dimensions of the shaft hole 120 and the second arc segment 144, which ensures the assembly stability of the rotating shaft 410 and the rotor core 300 while meeting the low stress design requirements of the rotor under the combined action of centrifugal force load and torque load.

[0131] Specifically, The values ​​include 0.6, 0.7, 0.8, and 0.9, etc., which will not be listed here.

[0132] Example 4:

[0133] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, based on Embodiment 3, Embodiment 4 provides a rotor lamination 100, which includes a lamination body 110, a shaft hole 120, a positioning protrusion 130, and a recess 140.

[0134] Along the axial direction of the rotor lamination 100, the lamination body 110 has a first end face 112 and a second end face 114.

[0135] The shaft hole 120 passes through the first end face 112 and the second end face 114.

[0136] The positioning protrusion 130 is provided on the hole wall of the shaft hole 120.

[0137] The recess 140 is connected between the positioning protrusion 130 and the hole wall of the shaft hole 120. Along the circumference of the shaft hole 120, the recess 140 includes a plurality of connected arc segments. The arc segments extend from the first end face 112 to the second end face 114. Among the plurality of arc segments, the arc segment closer to the positioning protrusion 130 is referred to as the first arc segment 142, and the arc segment connected to the first arc segment 142 away from the positioning protrusion 130 is referred to as the second arc segment 144.

[0138] Either the first arc segment 142 or the second arc segment 144 bends toward the outer peripheral wall of the stamping body 110.

[0139] The radius Ra of the first arc is smaller than the radius Rb of the second arc segment 144.

[0140] The distance La from the center of the first arc segment 142 to the preset plane 150 is less than the distance Lb from the center of the second arc segment 144 to the preset plane 150.

[0141] The outer surface of the positioning protrusion 130 includes an outer peripheral section 136 on the axial end face, and the preset plane 150 passes through the midpoint of the outer peripheral section 136 and the axis of the shaft hole 120, and the outer peripheral section 136 is perpendicular to the preset plane 150.

[0142] The distance from the axis of the shaft hole 120 to the center of the second circular arc segment 144 is Hb, and the radius of the shaft hole 120 is Ri, where,

[0143] Furthermore, such as Figure 6 As shown, the arc segment closest to the hole wall of the shaft hole 120 among the multiple arc segments is designated as the third arc segment 146, and the third arc segment 146 bends toward the axis of the shaft hole 120.

[0144] In detail, by reasonably arranging the structure of multiple arc segments, the arc segment closest to the hole wall of the shaft hole 120 is designated as the third arc segment 146. The third arc segment 146 bends towards the axis of the shaft hole 120, while the first arc segment 142 and the second arc segment 144 both bend towards the outer peripheral wall of the lamination body 110. That is, the bending directions of the first arc segment 142 and the third arc segment 146 are opposite, and the bending directions of the second arc segment 144 and the third arc segment 146 are also opposite. The arrangement of the third arc segment 146 ensures a smooth transition at the connection between the recess 140 and the hole wall of the shaft hole 120, avoiding the formation of sharp corners, preventing the rotating shaft 410 from contacting the recess 140, and ensuring no interference between the recess 140 and the mounting groove 412 and positioning protrusion 130 of the rotating shaft 410.

[0145] In this embodiment, there are three arc segments along the circumference of the shaft hole 120. The three arc segments are the first arc segment 142, the second arc segment 144, and the third arc segment 146.

[0146] In some other embodiments, the number of multiple arc segments is greater than three. Along the circumference of the shaft hole 120, the multiple arc segments include a first arc segment 142, a second arc segment 144, a third arc segment 146, and multiple remaining arc segments, which are located between the second arc segment 144 and the third arc segment 146.

[0147] Furthermore, along the circumference of the shaft hole 120, the arc length of either the first arc segment 142 or the second arc segment 144 is greater than the arc length of the third arc segment 146.

[0148] The fit structure of the first arc segment 142, the second arc segment 144, and the third arc segment 146 is further defined. Specifically, along the circumference of the shaft hole 120, the arc length of the first arc segment 142 is greater than the arc length of the third arc segment 146, and the arc length of the second arc segment 144 is greater than the arc length of the third arc segment 146. In other words, along the circumference of the shaft hole 120, the arc lengths of both the first and second arc segments 142 and 144 are greater than the arc length of the third arc segment 146. The smaller arc length of the third arc segment 146, while avoiding the formation of sharp angles at the connection between the recess 140 and the hole wall of the shaft hole 120, increases the contact area and contact angle between the rotor core 300 and the shaft 410, ensuring the fit stability of the rotor core 300 and the shaft 410, and thus contributing to the rotor's torque transmission capability.

[0149] Example 5:

[0150] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, based on Embodiment 4, Embodiment 5 provides a rotor lamination 100, which includes a lamination body 110, a shaft hole 120, a positioning protrusion 130, and a recess 140.

[0151] Along the axial direction of the rotor lamination 100, the lamination body 110 has a first end face 112 and a second end face 114.

[0152] The shaft hole 120 passes through the first end face 112 and the second end face 114.

[0153] The positioning protrusion 130 is provided on the hole wall of the shaft hole 120.

[0154] The recess 140 is connected between the positioning protrusion 130 and the hole wall of the shaft hole 120. Along the circumference of the shaft hole 120, the recess 140 includes a plurality of connected arc segments. The arc segments extend from the first end face 112 to the second end face 114. Among the plurality of arc segments, the arc segment closer to the positioning protrusion 130 is referred to as the first arc segment 142, and the arc segment connected to the first arc segment 142 away from the positioning protrusion 130 is referred to as the second arc segment 144.

[0155] Either the first arc segment 142 or the second arc segment 144 bends toward the outer peripheral wall of the stamping body 110.

[0156] The radius Ra of the first arc is smaller than the radius Rb of the second arc segment 144.

[0157] The distance La from the center of the first arc segment 142 to the preset plane 150 is less than the distance Lb from the center of the second arc segment 144 to the preset plane 150.

[0158] The outer surface of the positioning protrusion 130 includes an outer peripheral section 136 on the axial end face, and the preset plane 150 passes through the midpoint of the outer peripheral section 136 and the axis of the shaft hole 120, and the outer peripheral section 136 is perpendicular to the preset plane 150.

[0159] The distance from the axis of the shaft hole 120 to the center of the second circular arc segment 144 is Hb, and the radius of the shaft hole 120 is Ri, where,

[0160] The arc segment closest to the hole wall of the shaft hole 120 among the multiple arc segments is designated as the third arc segment 146, and the third arc segment 146 bends toward the axis of the shaft hole 120.

[0161] Furthermore, such as Figure 5 and Figure 6As shown, along the circumference of the shaft hole 120, the positioning protrusion 130 has a first side surface 132 and a second side surface 134.

[0162] Either the first side 132 or the second side 134 is perpendicular to the outer peripheral segment 136.

[0163] The distance W between the first side 132 and the second side 134.

[0164] The radius of the third arc segment 146 is Rc.

[0165] The distance from the axis of the shaft hole 120 to the center of the first circular arc segment 142 is Ha.

[0166] in, Ra≤Rb, La≤Lb, Hb=k4×Ri, 1≤k1≤2.5, 1.5≤k2≤2.5, 0.1≤k3≤3, 0.3 <K4<1。

[0167] In detail, the positioning protrusion 130 has a first side surface 132 and a second side surface 134, which are spaced apart in the circumferential direction of the shaft hole 120. The first side surface 132 is perpendicular to the outer peripheral segment 136 of the positioning protrusion 130, and the second side surface 134 is perpendicular to the outer peripheral segment 136 of the positioning protrusion 130. Alternatively, the first side surface 132 is perpendicular to the side of the positioning protrusion 130 facing the axis of the shaft hole 120, and the second side surface 134 is perpendicular to the side of the positioning protrusion 130 facing the axis of the shaft hole 120.

[0168] Furthermore, the mating dimensions of the recess 140, the positioning protrusion 130, and the shaft hole 120 are defined such that the distance W from the first side surface 132 to the second side surface 134, the radius Ra of the first arc, the radius Rb of the second arc segment 144, the radius Rc of the third arc segment 146, the distance Ha from the axis of the shaft hole 120 to the center of the first arc segment 142, the distance Hb from the axis of the shaft hole 120 to the center of the second arc segment 144, the distance La from the center of the first arc segment 142 to the preset plane 150, and the distance Lb from the center of the second arc segment 144 to the preset plane 150 satisfy the following: Ra≤Rb, La≤Lb, Hb=k4×Ri, 1≤k1≤2.5, 1.5≤k2≤2.5, 0.1≤k3≤3, 0.3<k4<1. This configuration ensures uniform deformation and stress distribution of the rotor core 300 under centrifugal load, thus alleviating stress concentration on the rotor core 300. While achieving low-stress design, this structure ensures no structural interference between the mounting groove 412 and the positioning protrusion 130 on the shaft 410; that is, the outer side of the mounting groove 412 on the shaft 410 does not contact the root of the positioning protrusion 130. Furthermore, this structural configuration ensures an effective contact area of ​​interference fit between the rotor core 300 and the shaft 410, guaranteeing the low-stress design requirements at the positioning protrusion 130 of the rotor core 300 after the initial assembly load is applied.

[0169] Specifically, the rotor lamination 100 of this application is directly compatible with design requirements for different inner diameters, peak torques, and peak speeds. By adjusting coefficients k1, k2, k3, and k4, the usage requirements of motors with different speeds can be met, achieving platform compatibility. This enables the design requirements of low stress, long life, cooling, and installation positioning for rotor core 300 with different inner diameter requirements to be met.

[0170] Specifically, the values ​​of k1 include 1.2, 1.4, 1.5, 1.6, 1.8, 2, 2.2, and 2.4, etc., which will not be listed here.

[0171] Specifically, the values ​​of k2 include 1.6, 1.8, 2, 2.2, and 2.4, etc., which will not be listed here.

[0172] Specifically, the values ​​of k3 include 0.2, 0.4, 0.6, 0.8, 1, 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.4, 2.6 and 2.8, etc., which will not be listed here.

[0173] Specifically, the values ​​of k4 include 0.6, 0.7, and 0.8, etc., which will not be listed here.

[0174] In this embodiment, the first side 132 is a plane, and the second side 134 is a plane.

[0175] In some other embodiments, the first side surface 132 includes any one or a combination of the following: a plane, a curved surface, and a folded surface. The second side surface 134 includes any one or a combination of the following: a plane, a curved surface, and a folded surface.

[0176] In this embodiment, the side of the positioning protrusion 130 facing the axis of the shaft hole 120 is a plane.

[0177] In other embodiments, the side of the positioning protrusion 130 facing the axis of the shaft hole 120 includes any one or a combination of the following: a plane, a curved surface, and a folded surface.

[0178] Example 6:

[0179] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, based on any of the above embodiments, Embodiment 6 provides a rotor lamination 100, which includes a lamination body 110, a shaft hole 120, a positioning protrusion 130, and a recess 140.

[0180] Along the axial direction of the rotor lamination 100, the lamination body 110 has a first end face 112 and a second end face 114.

[0181] The shaft hole 120 passes through the first end face 112 and the second end face 114.

[0182] The positioning protrusion 130 is provided on the hole wall of the shaft hole 120.

[0183] The recess 140 is connected between the positioning protrusion 130 and the hole wall of the shaft hole 120. Along the circumference of the shaft hole 120, the recess 140 includes a plurality of connected arc segments. The arc segments extend from the first end face 112 to the second end face 114. Among the plurality of arc segments, the arc segment closer to the positioning protrusion 130 is referred to as the first arc segment 142, and the arc segment connected to the first arc segment 142 away from the positioning protrusion 130 is referred to as the second arc segment 144.

[0184] Either the first arc segment 142 or the second arc segment 144 bends toward the outer peripheral wall of the stamping body 110.

[0185] The radius Ra of the first arc is smaller than the radius Rb of the second arc segment 144.

[0186] The distance La from the center of the first arc segment 142 to the preset plane 150 is less than the distance Lb from the center of the second arc segment 144 to the preset plane 150.

[0187] The outer surface of the positioning protrusion 130 includes an outer peripheral section 136 on the axial end face, and the preset plane 150 passes through the midpoint of the outer peripheral section 136 and the axis of the shaft hole 120, and the outer peripheral section 136 is perpendicular to the preset plane 150.

[0188] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, there are multiple positioning protrusions 130 and recesses 140, with each positioning protrusion 130 located between two recesses 140.

[0189] Multiple positioning protrusions 130 are arranged at circumferential intervals along the shaft hole 120.

[0190] In detail, the mating structure of the positioning protrusions 130 and the recesses 140 is further defined. There are multiple positioning protrusions 130 and multiple recesses 140. The multiple positioning protrusions 130 are arranged at intervals along the circumference of the shaft hole 120, and each positioning protrusion 130 is located between two recesses 140.

[0191] Multiple positioning protrusions 130 are evenly distributed on the wall of the shaft hole 120.

[0192] In this embodiment, there are two positioning protrusions 130.

[0193] In some other embodiments, the number of positioning protrusions 130 is one.

[0194] In some other embodiments, the number of positioning protrusions 130 is greater than two, such as three, four, five, six, etc., which will not be listed here.

[0195] Example 7:

[0196] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, based on any of the above embodiments, Embodiment 7 provides a rotor lamination 100, which includes a lamination body 110, a shaft hole 120, a positioning protrusion 130, and a recess 140.

[0197] Along the axial direction of the rotor lamination 100, the lamination body 110 has a first end face 112 and a second end face 114.

[0198] The shaft hole 120 passes through the first end face 112 and the second end face 114.

[0199] The positioning protrusion 130 is provided on the hole wall of the shaft hole 120.

[0200] The recess 140 is connected between the positioning protrusion 130 and the hole wall of the shaft hole 120. Along the circumference of the shaft hole 120, the recess 140 includes a plurality of connected arc segments. The arc segments extend from the first end face 112 to the second end face 114. Among the plurality of arc segments, the arc segment closer to the positioning protrusion 130 is referred to as the first arc segment 142, and the arc segment connected to the first arc segment 142 away from the positioning protrusion 130 is referred to as the second arc segment 144.

[0201] Either the first arc segment 142 or the second arc segment 144 bends toward the outer peripheral wall of the stamping body 110.

[0202] The radius Ra of the first arc is smaller than the radius Rb of the second arc segment 144.

[0203] The distance La from the center of the first arc segment 142 to the preset plane 150 is less than the distance Lb from the center of the second arc segment 144 to the preset plane 150.

[0204] The outer surface of the positioning protrusion 130 includes an outer peripheral section 136 on the axial end face, and the preset plane 150 passes through the midpoint of the outer peripheral section 136 and the axis of the shaft hole 120, and the outer peripheral section 136 is perpendicular to the preset plane 150.

[0205] Furthermore, such as Figure 1 , Figure 2 and Figure 3 As shown, the rotor lamination 100 also includes multiple slot groups 158.

[0206] Multiple slots 158 are provided on the lamination body.

[0207] Multiple slot groups 158 are arranged at intervals around the shaft hole 120. Each slot group 158 includes multiple permanent magnet slots 160. The multiple permanent magnet slots 160 are arranged at radial intervals along the shaft hole 120. Each permanent magnet slot 160 includes two slot bodies 162. Each slot body 162 includes a first end 164 and a second end 166. The first end 164 is closer to the shaft hole 120 than the second end 166.

[0208] The first ends 164 of the two slots 162 of each permanent magnet slot 160 are arranged close to each other, and the second ends 166 of the two slots 162 of each permanent magnet slot 160 are arranged far apart.

[0209] The positioning protrusion 130 is correspondingly provided with the two first ends 164 of the permanent magnet groove 160.

[0210] In detail, the rotor lamination 100 also includes a plurality of slot groups 158, each slot group 158 including a plurality of permanent magnet slots 160. Each permanent magnet slot 160 includes two slot bodies 162, each slot body 162 including a first end 164 and a second end 166. The first ends 164 of the two slot bodies 162 of each permanent magnet slot 160 are arranged adjacent to each other, and the second ends 166 of the two slot bodies 162 of each permanent magnet slot 160 are arranged away from each other. That is, the two slot bodies 162 of each permanent magnet slot 160 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 shaft hole 120.

[0211] The positioning protrusion 130 is correspondingly positioned at its two first ends 164 of the permanent magnet groove 160, thus defining the mating structure between the positioning protrusion 130 and the permanent magnet groove 160. When machining the rotor lamination 100, the permanent magnet groove 160 can serve as a reference for machining the positioning protrusion 130, reducing the machining difficulty of the rotor lamination 100. This provides structural assurance for the effective assembly of multiple rotor laminations 100 to form the rotor core 300.

[0212] Understandably, the portion of the lamination body 110 located at the two first ends 164 of the permanent magnet slot 160 constitutes a positioning area. The positioning protrusion 130 of one of the multiple rotor laminations 100 constituting the rotor core 300 is located directly below the positioning area of ​​one of the permanent magnet slots 160. The positioning protrusions 130 of the remaining rotor laminations 100 are offset at different angles relative to their positioning areas.

[0213] Furthermore, such as Figure 1 , Figure 2 and Figure 3 As shown, the rotor lamination 100 also includes a plurality of first weight reduction holes 170 and a plurality of second weight reduction holes 180.

[0214] The portion of the lamination body located between any two adjacent slot groups 158 is provided with at least one first weight reduction hole 170.

[0215] The portion of the lamination body located between the shaft hole 120 and each slot group 158 is provided with at least one second weight reduction hole 180.

[0216] The positioning protrusion 130 is located between the second weight reduction hole 180 and the shaft hole 120.

[0217] The rotor lamination 100 also includes multiple first weight reduction holes 170 and multiple second weight reduction holes 180.

[0218] The portion of the lamination body located between any two adjacent slot groups 158 is provided with at least one first weight reduction hole 170, and the portion of the lamination body located between the shaft hole 120 and each slot group 158 is provided with at least one second weight reduction hole 180.

[0219] The placement of the first weight-reducing hole 170 reduces the weight of the lamination body. Furthermore, the alignment of the first weight-reducing hole 170, the permanent magnet slot 160, and the shaft hole 120 ensures balanced deformation of the lamination body, resulting in a relatively uniform stress distribution and maintaining a relatively low overall stress level. Simultaneously, the weight-reducing area containing the first weight-reducing hole 170 has minimal impact on the magnetic flux distribution on the lamination body, thus not affecting the original electromagnetic properties of the lamination body. In other words, while meeting weight reduction requirements, the requirements for rotor stress and fatigue life are also satisfied.

[0220] Since the magnetic bridge region near the two slots 162 of each permanent magnet slot 160 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 the second weight reduction hole 180, shaft hole 120, permanent magnet slot 160 and first weight reduction hole 170, the deformation of the magnetic bridge region of the lamination body can be ensured to be balanced, so that the stress is relatively uniformly distributed, and the influence on the magnetic flux distribution on the lamination body can be effectively reduced.

[0221] Furthermore, the positioning protrusion 130 is located between the second weight-reducing hole 180 and the shaft hole 120, defining the mating structure of the positioning protrusion 130 and the second weight-reducing hole 180. When machining the rotor lamination 100, the second weight-reducing hole 180 can serve as a reference for machining the positioning protrusion 130, reducing the machining difficulty of the rotor lamination 100. This provides structural assurance for the effective assembly of multiple rotor laminations 100 to form the rotor core 300.

[0222] Specifically, a cross-section is made of the lamination body along the axial direction perpendicular to the shaft hole 120. In the cross-section, the shape of the outline of the first weight reduction hole 170 includes a trapezoid, and the shape of the outline of the second weight reduction hole 180 includes a circle.

[0223] Of course, the shape of the outline of the first weight reduction hole 170 is not limited to trapezoid, but can also be rectangular, elliptical, pentagonal, etc., which will not be listed here.

[0224] Of course, the shape of the outline of the second weight reduction hole 180 is not limited to a circle, but can also be a rectangle, trapezoid, pentagon, etc., which will not be listed here.

[0225] When the outline of the weight reduction hole is trapezoidal, rectangular, or pentagonal, the connection between two adjacent sides is smoothly transitioned.

[0226] Specifically, the portion of the lamination body located between the shaft hole 120 and each permanent magnet slot 160 is provided with a second weight-reducing hole 180. The positioning protrusion 130 of one of the plurality of rotor laminations 100 constituting the rotor core 300 is located directly below the second weight-reducing hole 180. The positioning protrusions 130 of the remaining rotor laminations 100 are offset at different angles relative to the second weight-reducing hole 180.

[0227] Example 8:

[0228] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, based on any of the above embodiments, Embodiment 8 provides a rotor lamination 100, which includes a lamination body 110, a shaft hole 120, a positioning protrusion 130, and a recess 140.

[0229] Along the axial direction of the rotor lamination 100, the lamination body 110 has a first end face 112 and a second end face 114.

[0230] The shaft hole 120 passes through the first end face 112 and the second end face 114.

[0231] The positioning protrusion 130 is provided on the hole wall of the shaft hole 120.

[0232] The recess 140 is connected between the positioning protrusion 130 and the hole wall of the shaft hole 120. Along the circumference of the shaft hole 120, the recess 140 includes a plurality of connected arc segments. The arc segments extend from the first end face 112 to the second end face 114. Among the plurality of arc segments, the arc segment closer to the positioning protrusion 130 is referred to as the first arc segment 142, and the arc segment connected to the first arc segment 142 away from the positioning protrusion 130 is referred to as the second arc segment 144.

[0233] Either the first arc segment 142 or the second arc segment 144 bends toward the outer peripheral wall of the stamping body 110.

[0234] The radius Ra of the first arc is smaller than the radius Rb of the second arc segment 144.

[0235] The distance La from the center of the first arc segment 142 to the preset plane 150 is less than the distance Lb from the center of the second arc segment 144 to the preset plane 150.

[0236] The outer surface of the positioning protrusion 130 includes an outer peripheral section 136 on the axial end face, and the preset plane 150 passes through the midpoint of the outer peripheral section 136 and the axis of the shaft hole 120, and the outer peripheral section 136 is perpendicular to the preset plane 150.

[0237] Furthermore, such as Figure 3 and Figure 4 As shown, the rotor lamination 100 also includes at least one positioning groove 190, which is disposed on the wall of the shaft hole 120.

[0238] In detail, by reasonably setting the structure of the rotor lamination 100, the rotor lamination 100 also includes at least one positioning groove 190. The at least one positioning groove 190 is provided on the hole wall of the shaft hole 120. The positioning groove 190 has a positioning function, so it can be used as a positioning reference for machining the rotor lamination 100, and can ensure the matching dimensions of the multiple rotor laminations 100 that make up the rotor core 300.

[0239] Example 9:

[0240] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, based on any of the above embodiments, Embodiment 9 provides a rotor lamination 100, which includes a lamination body 110, a shaft hole 120, a positioning protrusion 130, and a recess 140.

[0241] Along the axial direction of the rotor lamination 100, the lamination body 110 has a first end face 112 and a second end face 114.

[0242] The shaft hole 120 passes through the first end face 112 and the second end face 114.

[0243] The positioning protrusion 130 is provided on the hole wall of the shaft hole 120.

[0244] The recess 140 is connected between the positioning protrusion 130 and the hole wall of the shaft hole 120. Along the circumference of the shaft hole 120, the recess 140 includes a plurality of connected arc segments. The arc segments extend from the first end face 112 to the second end face 114. Among the plurality of arc segments, the arc segment closer to the positioning protrusion 130 is referred to as the first arc segment 142, and the arc segment connected to the first arc segment 142 away from the positioning protrusion 130 is referred to as the second arc segment 144.

[0245] Either the first arc segment 142 or the second arc segment 144 bends toward the outer peripheral wall of the stamping body 110.

[0246] The radius Ra of the first arc is smaller than the radius Rb of the second arc segment 144.

[0247] The distance La from the center of the first arc segment 142 to the preset plane 150 is less than the distance Lb from the center of the second arc segment 144 to the preset plane 150.

[0248] The outer surface of the positioning protrusion 130 includes an outer peripheral section 136 on the axial end face, and the preset plane 150 passes through the midpoint of the outer peripheral section 136 and the axis of the shaft hole 120, and the outer peripheral section 136 is perpendicular to the preset plane 150.

[0249] Furthermore, such as Figure 1 , Figure 2 and Figure 3 As shown, the rotor lamination 100 also includes a plurality of shaving grooves 200, which are distributed circumferentially along the shaft hole 120 on the outer peripheral wall of the lamination body.

[0250] In detail, the rotor lamination 100 also includes a plurality of serrated grooves 200, which are distributed circumferentially along the shaft hole 120 on the outer peripheral wall of the lamination body.

[0251] The rotor lamination 100 is used in motors, and the torque ripple of the motor is related to the non-sinusoidal air gap magnetic field. The higher the harmonic content in the air gap magnetic field, the worse the output torque waveform of the motor, the greater the ripple, and the greater the NVH (Noise, Vibration, and Harshness).

[0252] Therefore, multiple arc-cutting grooves 200 are distributed circumferentially along the shaft hole 120 on the outer peripheral wall of the lamination body. This can effectively reduce the harmonic content in the air gap magnetic field, thereby improving the sinusoidality of the air gap magnetic flux density waveform, improving the torque pulsation of the motor, reducing the radial force caused by harmonics, reducing the operating noise of the motor, improving NVH performance, and thus enhancing the product's performance and market competitiveness.

[0253] The 200-sharpened groove not only effectively improves the motor's output performance but also helps reduce motor costs. Simultaneously, the 200-sharpened groove can partially adjust the no-load back EMF waveform and radial force, reducing the motor's maximum no-load line back EMF and lowering controller costs. Without changing the motor's average air gap length and ensuring no reduction in output torque, it effectively improves the air gap magnetic field, increasing the air gap magnetic flux density and the sinusoidal nature of the back EMF waveform, reducing harmonic content, and thus reducing torque ripple, significantly lowering motor vibration and noise.

[0254] Specifically, the portion of the lamination body located between the two second ends 166 of the permanent magnet groove 160 is correspondingly provided with at least one arc-cutting groove 200.

[0255] Furthermore, such as Figure 1 , Figure 2 and Figure 3 As shown, the rotor lamination 100 also includes a plurality of snap-fit ​​parts 210, which are disposed on the lamination body and are used for mounting and positioning the lamination body.

[0256] Multiple snap-fit ​​parts 210 are provided on the lamination body, allowing any two adjacent rotor laminations 100 to be assembled together. In other words, the multiple snap-fit ​​parts 210 can assemble multiple lamination bodies together. This design ensures the stability of the assembly of any two adjacent rotor laminations 100 while increasing the mating area between them, enabling multi-directional and multi-angle limiting functions. This improves the effectiveness and feasibility of assembling multiple rotor laminations 100 and prevents them from scattering. Furthermore, this design achieves proper positioning between the multiple rotor laminations 100, preventing relative movement between any two adjacent rotor laminations 100. This avoids potential misalignment of the rotor laminations 100 during operation and contributes to improving the overall stability of the rotor.

[0257] Example 10:

[0258] like Figure 1 As shown, an embodiment of the second aspect of the present invention provides a rotor core 300, comprising: a plurality of rotor laminations 100 as in any embodiment of the first aspect, wherein the plurality of rotor laminations 100 are stacked.

[0259] In detail, the rotor core 300 includes the rotor laminations 100 as described in the first aspect, and therefore has all the beneficial effects of the rotor laminations 100, which will not be described in detail here.

[0260] Specifically, the positioning protrusions 130 of multiple rotor laminations 100 are arranged along the axial direction of the lamination body, and the positioning protrusions 130 of multiple rotor laminations 100 together form a flat key structure.

[0261] Example 11:

[0262] like Figure 1 As shown, an embodiment of the third aspect of the present invention provides a rotor 400, which includes a shaft 410 and a rotor core 300 as described in the second aspect.

[0263] The rotating shaft 410 is provided with a mounting groove 412.

[0264] A portion of the rotating shaft 410 is located within the shaft hole 120, and the positioning protrusion 130 can be inserted into the mounting groove 412.

[0265] In detail, since the rotor includes the rotor core 300 as described in the second aspect, it has all the beneficial effects of the rotor core 300 described above, which will not be described one by one here.

[0266] Furthermore, the mounting groove 412 engages with the positioning protrusion 130 of each rotor lamination 100 so that any two adjacent rotor laminations 100 are staggered in the circumferential direction of the shaft 410.

[0267] By reasonably setting the mating structure between the rotating shaft 410 and multiple rotor laminations 100, the mounting groove 412 is mated with the positioning protrusion 130 of each rotor lamination 100, so that any two adjacent rotor laminations 100 are staggered in the circumferential direction of the rotating shaft 410.

[0268] The rotor 400 is used in the motor. Any two adjacent rotor laminations 100 are staggered circumferentially on the shaft 410, meaning the rotor is segmented with skewed poles, and any two adjacent rotor laminations 100 have a relative rotational angle. This allows the harmonic magnetic fields on different rotor laminations 100 to partially cancel each other out, suppressing harmonic components of specific octaves in the motor, effectively reducing noise during motor operation, and improving product performance and market competitiveness.

[0269] Specifically, multiple rotor laminations 100 are stacked along the axial direction of the shaft 410, and the outer peripheral walls of all rotor laminations 100 completely overlap. This stacked assembly arrangement can reduce eddy current losses in the rotor core 300.

[0270] Example 12:

[0271] An embodiment of the fourth aspect of the present invention provides an electric motor comprising: a rotor 400 as described in any embodiment of the third aspect.

[0272] In detail, since the motor includes a rotor 400 as described in the third aspect, it has all the beneficial effects of the rotor 400 described above, which will not be described one by one here.

[0273] Example 13:

[0274] A fifth aspect of the invention provides a vehicle comprising: an electric motor as described in the fourth aspect.

[0275] In detail, since the vehicle includes an electric motor as described in the fourth aspect, it has all the beneficial effects of the aforementioned electric motor, which will not be elaborated here.

[0276] 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.

[0277] Example 14:

[0278] This application defines a rotor, which includes a rotor core 300, magnets, and a rotating shaft 410. The rotor core 300 is provided with a plurality of slot groups 158, the slot groups 158 having a double V structure, and the plurality of slot groups 158 are arranged at intervals around the shaft hole 120.

[0279] The rotor core 300 has multiple first weight reduction holes 170 and multiple second weight reduction holes 180 distributed on it. The multiple first weight reduction holes 170 are arranged at intervals along the circumference of the shaft hole 120, and the multiple second weight reduction holes 180 are arranged at intervals along the circumference of the shaft hole 120.

[0280] The inner side of the rotor core 300 has multiple positioning protrusions 130 and multiple recesses 140 evenly distributed, with each positioning protrusion 130 located between two recesses 140. That is, the positioning protrusions 130 and the inner side of the rotor core 300 adopt a multi-segment arc structure for smooth transition, achieving a gradual change in stiffness, thereby ensuring low stress design of the rotor under the combined action of centrifugal force load and torque load.

[0281] Specifically, the weight-reducing holes can be used for structural weight reduction, cooling, and positioning. Torque is transmitted between the rotor core 300 and the shaft 410 using a flat key (i.e., a positioning protrusion).

[0282] Specifically, the rotor core 300 is provided with double V-shaped magnets, and multiple double V-shaped magnets are arranged at equal intervals along the circumference of the shaft hole 120. A second weight reduction hole 180 is provided on the lower side of the double V-shaped magnet, and the second weight reduction hole 180 is located at the center position directly below the double V-shaped magnet.

[0283] Specifically, there are two positioning protrusions 130, which are arranged at equal intervals along the circumference of the shaft hole 120. One of the positioning protrusions 130 is located directly below the circular weight-reducing hole.

[0284] The positioning protrusion 130 and the inner side of the rotor core 300 are transitionally fitted with a concave portion 140 having multiple arc segments. This design makes the stiffness transition at the root of the positioning protrusion 130 smooth, which can greatly alleviate the high stress concentration phenomenon at the root of the positioning protrusion 130.

[0285] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" 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 invention according to the specific circumstances.

[0286] 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 the present invention. 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.

[0287] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rotor lamination, characterized in that, include: The lamination body, along the axial direction of the rotor lamination, has a first end face and a second end face; A shaft hole penetrates both the first end face and the second end face; A positioning protrusion is provided on the wall of the shaft hole; A recess is connected between the positioning protrusion and the hole wall of the shaft hole. Along the circumference of the shaft hole, the recess includes a plurality of connected arc segments. The arc segments extend from the first end face to the second end face. Among the plurality of arc segments, the arc segment closer to the positioning protrusion is referred to as the first arc segment, and the arc segment connected to the first arc segment away from the positioning protrusion is referred to as the second arc segment. Either the first arc segment or the second arc segment bends toward the outer peripheral wall of the lamination body; The radius Ra of the first arc segment is smaller than the radius Rb of the second arc segment; The distance La from the center of the first arc segment to the preset plane is less than the distance Lb from the center of the second arc segment to the preset plane; The outer surface of the positioning protrusion includes an outer peripheral segment on the axial end face, the preset plane passes through the midpoint of the outer peripheral segment and the axis of the shaft hole, and the outer peripheral segment is perpendicular to the preset plane; The arc segment closest to the hole wall of the shaft hole among the plurality of arc segments is referred to as the third arc segment, and the third arc segment bends toward the axis of the shaft hole; Along the circumferential direction of the shaft hole, the positioning protrusion has a first side surface and a second side surface, either the first side surface or the second side surface is perpendicular to the outer peripheral segment, and the distance from the first side surface to the second side surface is W; The distance from the axis of the shaft hole to the center of the second arc segment is Hb, the radius of the shaft hole is Ri, the radius of the third arc segment is Rc, and the distance from the axis of the shaft hole to the center of the first arc segment is Ha; in, , , , , , , , , , .

2. The rotor lamination according to claim 1, characterized in that, Along the circumference of the shaft hole, the arc length of the first arc segment is less than the arc length of the second arc segment.

3. The rotor lamination according to claim 1 or 2, characterized in that, 0.3≤ ≤1。 4. The rotor lamination according to claim 1, characterized in that, Along the circumference of the shaft hole, the arc length of either the first arc segment or the second arc segment is greater than the arc length of the third arc segment.

5. The rotor lamination according to claim 1 or 2, characterized in that, The number of either the positioning protrusion or the recess is multiple, and each positioning protrusion is located between two recesses; The plurality of positioning protrusions are arranged at circumferential intervals along the shaft hole.

6. The rotor lamination according to claim 1 or 2, characterized in that, Also includes: Multiple slot groups are provided on the lamination body. The multiple slot groups are arranged at intervals around the shaft hole. Each slot group includes multiple permanent magnet slots. The multiple permanent magnet slots are arranged at intervals along the radial direction of the shaft hole. Each permanent magnet slot includes two slot bodies. Each slot body includes a first end and a second end. The first end is closer to the shaft hole than the second end. The first ends of the two slots of each permanent magnet slot are arranged close to each other, and the second ends of the two slots of each permanent magnet slot are arranged far apart; The positioning protrusion is provided corresponding to the two first ends of the permanent magnet groove.

7. The rotor lamination according to claim 6, characterized in that, Also includes: Multiple first weight reduction holes are provided, and at least one first weight reduction hole is provided on the portion of the lamination body located between any two adjacent slot groups; Multiple second weight-reducing holes are provided, with at least one second weight-reducing hole provided in the portion of the lamination body located between the shaft hole and each of the slot groups; The positioning protrusion is located between the second weight-reducing hole and the shaft hole.

8. The rotor lamination according to claim 1 or 2, characterized in that, Also includes: At least one positioning groove is provided on the wall of the shaft hole.

9. The rotor lamination according to claim 1 or 2, characterized in that, Also includes: Multiple arc-cutting grooves are distributed at intervals along the circumference of the shaft hole on the outer peripheral wall of the lamination body; Multiple latching parts are provided on the stamping body, and the latching parts are used for the installation and positioning of the stamping body.

10. A rotor core, characterized in that, include: A plurality of rotor laminations as described in any one of claims 1 to 9, wherein the plurality of rotor laminations are stacked.

11. A rotor, characterized in that, include: A rotating shaft, wherein the rotating shaft is provided with a mounting groove; and As in claim 10, a portion of the rotating shaft is located within the shaft hole, and the positioning protrusion is capable of being inserted into the mounting groove.

12. The rotor according to claim 11, characterized in that, The mounting groove engages with the positioning protrusion of each rotor lamination to allow any two adjacent rotor laminations to be staggered in the circumferential direction of the shaft.

13. An electric motor, characterized in that, include: The rotor as described in claim 11 or 12.

14. A vehicle, characterized in that, include: The motor as described in claim 13.

Images