Rotor core, rotor, motor, chassis system and vehicle

Abstract

The invention provides a rotor core, a rotor, a motor, a chassis system and a vehicle. The rotor iron core comprises a first iron core structure and a second iron core structure. The first iron core structure comprises a first punching sheet, a first body of the first punching sheet is provided with a first installation hole and a plurality of first installation grooves, and the part, located between the first installation hole and the first installation grooves, of the first body comprises a first inner magnetic bridge and a first isolation groove. The part, located between the first mounting groove and the peripheral wall of the first body, of the first body is a first outer magnetic bridge; the second iron core structure comprises at least one of a second punching sheet and a third punching sheet; the second punching sheet comprises a first annular part and a second body, the second body surrounds the first annular part, the first annular part and the second body are arranged at an interval, and the second body is provided with a plurality of second mounting grooves; the third punching sheet comprises a second annular part and a plurality of installation structures, a third installation hole is defined by the inner circumferential wall of the second annular part, and the installation structures are arranged around the third installation hole at intervals.

Description

Technical Field

[0001] This application relates to the technical field of electric motors, and more specifically, to a rotor core, a rotor, an electric motor, a chassis system, and a vehicle. Background Art

[0002] In the related art, an electric motor includes a rotor core, and the rotor core includes an inner magnetic bridge and an outer magnetic bridge to meet the structural strength of the rotor core. However, this structural arrangement reduces the torque of the electric motor and degrades the performance of the product. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] To this end, a first aspect of this application provides a rotor core.

[0005] A second aspect of this application provides a rotor.

[0006] A third aspect of this application provides an electric motor.

[0007] A fourth aspect of this application provides a chassis system.

[0008] A fifth aspect of this application provides a vehicle.

[0009] In view of this, the present application provides a rotor core, comprising: a first core structure, the first core structure includes a first punching sheet, the first punching sheet includes a first body, the first body is provided with a first mounting hole and a plurality of first mounting grooves, the plurality of first mounting grooves are arranged at intervals around the first mounting hole, a portion of the first body between the first mounting hole and the first mounting grooves includes a first inner magnetic bridge and a first isolation groove, and a portion of the first body between the first mounting grooves and the outer peripheral wall of the first body is a first outer magnetic bridge; a second core structure, the second core structure is stacked with the first punching sheet, and the second core structure includes at least one of a second punching sheet and a third punching sheet; the second punching sheet includes a first annular portion and a second body, the second body surrounds the first annular portion, the first annular portion and the second body are arranged at intervals, an inner peripheral wall of the first annular portion encloses a second mounting hole, the second body is provided with a plurality of second mounting grooves, the plurality of second mounting grooves are arranged at intervals around the second mounting hole, the second mounting grooves extend from the inner peripheral wall of the second body to the outer peripheral wall of the second body, a portion of the second punching sheet between the second mounting hole and the second mounting grooves is a second inner magnetic bridge, and a portion of the second body between the second mounting grooves and the outer peripheral wall of the second body is a second outer magnetic bridge; the third punching sheet includes a second annular portion and a plurality of mounting structures, an inner peripheral wall of the second annular portion encloses a third mounting hole, the plurality of mounting structures are arranged at intervals around the third mounting hole, the mounting structures are connected to the outer peripheral wall of the second annular portion, and a portion of the third punching sheet between the third mounting hole and the third mounting grooves is a second isolation groove.

[0010] A rotor core provided by the present application includes a first core structure and a second core structure.

[0011] The first core structure includes a first punching sheet, and the second core structure is stacked with the first punching sheet.

[0012] The second core structure includes at least one of a second punching sheet and a third punching sheet, that is, the second core structure includes the second punching sheet, or the second core structure includes the third punching sheet, or the second core structure includes the second punching sheet and the third punching sheet. When the second core structure includes the second punching sheet and the third punching sheet, the first punching sheet, the second punching sheet, and the third punching sheet are stacked.

[0013] Specifically, the first punching sheet includes a first body, the first body is provided with a first mounting hole and a plurality of first mounting grooves, and the plurality of first mounting grooves are arranged at intervals around the first mounting hole. The first mounting grooves are used for mounting permanent magnets. The first mounting grooves are arranged at intervals from the first mounting hole, and the first mounting grooves are arranged at intervals from the outer peripheral wall of the first punching sheet.

[0014] The part of the first body located between two adjacent first mounting grooves is the first pole part. The part of the first body located between the first mounting hole and the first mounting groove includes a first inner magnetic bridge and a first isolation groove. The part of the first body located between the first mounting groove and the outer peripheral wall of the first body is the first outer magnetic bridge. In other words, the first mounting hole and the first mounting groove are connected by the first inner magnetic bridge, and the first mounting groove and the outer peripheral wall of the first body are connected by the first outer magnetic bridge.

[0015] Compared with the related art where the inner magnetic bridge is removed and the rotor punching is formed by injection molding, the structure of the first punching piece of the present application can improve the strength of the first iron core structure, reduce the occurrence probability of deformation of the rotor iron core, and ensure the stability and reliability of the motor operation.

[0016] Specifically, the second punching piece includes a first annular part and a second body. The second body surrounds the first annular part, and the first annular part and the second body are arranged at intervals. That is to say, the second body is of an annular structure and is arranged at intervals with the first annular part. In other words, the second body and the first annular part are disconnected. It can be understood that the inner peripheral wall of the first annular part encloses a second mounting hole, and the outer peripheral wall of the first annular part is disconnected from the inner peripheral wall of the second body.

[0017] A part of the inner peripheral wall of the second body is recessed towards the outer peripheral wall of the second body to form a second mounting groove. The number of the second mounting grooves is multiple, and the multiple second mounting grooves are arranged at intervals around the second mounting hole. The part of the second body located between two adjacent second mounting grooves is the second pole part. The part of the second body located between the second mounting groove and the outer peripheral wall of the second body is the second outer magnetic bridge. The part of the second punching piece located between the second mounting hole and the second mounting groove is the second inner magnetic bridge. In other words, the second mounting groove and the outer peripheral wall of the second body are connected by the second outer magnetic bridge. The second mounting groove is used for mounting a permanent magnet.

[0018] By reasonably setting the structure of the second punching piece, magnetic leakage can be reduced, the torque density of the motor can be improved, torque ripple and cogging torque can be reduced, which is beneficial to improving the use performance and market competitiveness of the product.

[0019] Specifically, the third punching piece includes a second annular part and a plurality of mounting structures. The inner peripheral wall of the second annular part encloses a third mounting hole, and the plurality of mounting structures are arranged at intervals around the third mounting hole. The mounting structures are connected to the outer peripheral wall of the second annular part. The second annular part and two adjacent mounting structures enclose a third mounting groove. That is to say, the part of the outer peripheral wall of the third punching piece opposite to the third mounting groove is disconnected to form a notch. The third mounting groove is used for mounting a permanent magnet. The mounting structures form a third pole part.

[0020] By reasonably setting the structure of the third punching sheet, the magnetic leakage can be reduced, and the rotor core has a good magnetic concentrating effect, enabling the motor to have a relatively high maximum output torque and a relatively low back electromotive force voltage. Moreover, it is beneficial to improve the power density of the motor, that is, while ensuring the usage requirements of the power density of the motor, it can increase the torque density of the motor, reduce the torque ripple and cogging torque, be beneficial to reduce the volume of the motor, and be beneficial to improve the stability and reliability of the motor during use.

[0021] It can be seen from this that by reasonably setting the structure of the rotor core, the rotor core includes a first punching sheet and a second punching sheet, or the rotor core includes a first punching sheet and a third punching sheet, or the rotor core includes a first punching sheet, a second punching sheet and a third punching sheet. This setting takes into account both the structural strength and the magnetic leakage. While ensuring the structural strength of the rotor core, it is beneficial to reduce the magnetic leakage, can increase the torque density of the motor, reduce the torque ripple and cogging torque, and is beneficial to improve the usage performance and market competitiveness of the product.

[0022] According to the rotor core of the present application described above, it may further have the following additional technical features:

[0023] In some embodiments, optionally, at least one of the second mounting hole and the third mounting hole penetrates axially along the rotor core with the first mounting hole to form a shaft hole, and at least one of the second mounting groove and the third mounting groove penetrates axially along the rotor core with the first mounting groove to form a slot; the height of the first iron core structure in the axial direction of the rotor core is denoted as L1, the width of the slot in the circumferential direction of the rotor core is denoted as Lm, the depth of the slot in the direction from the shaft hole to the outer peripheral wall of the rotor core is denoted as Wm, the axial height of the rotor core is denoted as H, and the distance from the center of the shaft hole to the outer peripheral wall of the rotor core is denoted as R1; wherein, L1×(Lm + Wm) < π×H×R1.

[0024] In this embodiment, the matching structure of the first iron core structure and the second iron core structure is further defined.

[0025] So that at least one of the second mounting hole and the third mounting hole penetrates axially along the rotor core with the first mounting hole to form a shaft hole, and at least one of the second mounting groove and the third mounting groove penetrates axially along the rotor core with the first mounting groove to form a slot. The shaft hole is used to cooperate with the rotating shaft of the motor, and a permanent magnet is arranged in the slot. The slot has the function of installing and fixing the permanent magnet. The slot wall can limit the permanent magnet in multiple directions, restrict the moving path of the permanent magnet, and avoid the situation that the permanent magnet shifts during the operation of the motor, resulting in an increase in the operating noise of the motor.

[0026] Further, along the axial direction of the rotor core, the height of the first core structure is denoted as L1. Along the circumferential direction of the rotor core, the width of the slot is denoted as Lm. Along the direction from the shaft hole to the outer peripheral wall of the rotor core, the depth of the slot is denoted as Wm. The axial height of the rotor core is denoted as H. The distance from the center of the shaft hole to the outer peripheral wall of the rotor core is denoted as R1. Among them, the relationship between L1, Lm, Wm, H, and R1 satisfies: L1×(Lm + Wm) < π×H×R1. This setting limits the material input of the first core structure relative to the second core structure. For example, it limits the proportion of the axial length of the first core structure, that is, it limits the material input ratio of the first core structure and the rotor core. In this way, it takes into account both the structural strength and the magnetic leakage. While ensuring the structural strength of the rotor core, it is beneficial to reduce the magnetic leakage, can improve the torque density of the motor, can reduce the torque ripple and cogging torque, and is beneficial to improving the use performance and market competitiveness of the product.

[0027] Taking a cross-section of the rotor core perpendicular to its axial direction, in the cross-section, the contour line of the slot includes a slot bottom and a slot opening, and the slot bottom and the slot opening are arranged at intervals along the direction from the shaft hole to the outer peripheral wall of the rotor core. The point on the slot bottom is denoted as the third point, and along the direction from the shaft hole to the outer peripheral wall of the rotor core, the point on the slot opening opposite to the third point is denoted as the fourth point, and the distance from the third point to the fourth point is denoted as Wm.

[0028] In some embodiments, optionally, L1, Lm, Wm, H, and R1 satisfy: 0 < (L1×(Lm + Wm)) / (π×H×R1) ≤ 0.6.

[0029] In this embodiment, the mating structure of the first core structure and the second core structure is further limited. The relationship between L1, Lm, Wm, H, and R1 is limited to satisfy: 0 < (L1×(Lm + Wm)) / (π×H×R1) ≤ 0.6.

[0030] This setting reduces the torque ripple and cogging torque while ensuring sufficient motor output torque, which is beneficial to reducing the running noise of the motor and is beneficial to improving the use performance and market competitiveness of the product.

[0031] Optionally, (L1×(Lm + Wm)) / (π×H×R1) = 0.3, (L1×(Lm + Wm)) / (π×H×R1) = 0.35, (L1×(Lm + Wm)) / (π×H×R1) = 0.4, (L1×(Lm + Wm)) / (π×H×R1) = 0.45, (L1×(Lm + Wm)) / (π×H×R1) = 0.5, (L1×(Lm + Wm)) / (π×H×R1) = 0.55, etc., which are not listed one by one here.

[0032] In some embodiments, optionally, L1, Lm, Wm, H, and R1 satisfy: 0 < (L1×(Lm + Wm)) / (π×H×R1) ≤ 0.26.

[0033] In this embodiment, the mating structure of the first iron core structure and the second iron core structure is further defined. The relationship between L1, Lm, Wm, H, and R1 is defined to satisfy: 0 < (L1×(Lm + Wm)) / (π×H×R1) ≤ 0.26.

[0034] This setting, while ensuring sufficient motor output torque, further optimizes torque ripple and cogging torque, which is beneficial to reducing the operating noise of the motor and improving the product's performance and market competitiveness.

[0035] In some embodiments, optionally, the first iron core structure includes a plurality of first punching sheets; along the axial direction of the rotor iron core, the plurality of first punching sheets are stacked on the same side of the second iron core structure.

[0036] In this embodiment, the mating structure of the first iron core structure and the second iron core structure is further defined. The first iron core structure includes a plurality of first punching sheets, and the plurality of first punching sheets are stacked on the same axial side of the second iron core structure. Specifically, along the axial direction of the rotor iron core, the plurality of first punching sheets are stacked on one side of the second iron core structure. That is, any one of the plurality of first punching sheets is located on one side of the axial direction of the second iron core structure.

[0037] In some embodiments, optionally, the first iron core structure includes a plurality of first punching sheets; along the axial direction of the rotor iron core, a part of the plurality of first punching sheets are stacked on one side of the second iron core structure, and another part of the plurality of first punching sheets are stacked on the other side of the second iron core structure.

[0038] In this embodiment, the mating structure of the first iron core structure and the second iron core structure is further defined. The first iron core structure includes a plurality of first punching sheets, a part of the plurality of first punching sheets are stacked on one side of the second iron core structure, and another part of the plurality of first punching sheets are stacked on the other side of the second iron core structure. That is to say, the second iron core structure is clamped in the middle of the plurality of first punching sheets. The plurality of first punching sheets fix the second punching sheet and / or the third punching sheet of the second iron core structure from multiple directions, increasing the contact area and contact angle between the first punching sheets and the second iron core structure, which is beneficial to improving the stability and reliability of the assembly of the first iron core structure and the second iron core structure.

[0039] In some embodiments, optionally, the portion of the first body located between two adjacent first mounting grooves is the first pole portion. The first inner magnetic bridge includes: an annular portion, the inner peripheral wall of the annular portion encloses a first mounting hole, the outer peripheral wall of the annular portion is spaced from the first pole portion to enclose a first isolation groove, and the first mounting groove communicates with the first isolation groove; a plurality of first fixing protrusions, the first fixing protrusions are connected to the outer peripheral wall of the annular portion, and the first fixing protrusions are arranged opposite to one first mounting groove; a plurality of first connecting portions, the first connecting portions are connected between the outer peripheral wall of the annular portion and the first pole portion, and the plurality of first connecting portions and the plurality of first fixing protrusions are arranged staggeredly; when the second iron core structure includes a third punching piece, the mounting structure includes: a second connecting portion; a magnetic pole portion, along the third mounting hole to the outer peripheral wall of the third punching piece, the second connecting portion is connected between the second annular portion and the magnetic pole portion; a first limiting section; a second limiting section, along the circumferential direction of the rotor iron core, the magnetic pole portion is connected between the first limiting section and the second limiting section, and either one of the first limiting section and the second limiting section is arranged away from the second annular portion; a plurality of second fixing protrusions are provided on the outer peripheral wall of the second annular portion, and the second fixing protrusions are arranged opposite to one third mounting groove.

[0040] In this embodiment, the structures of the first punching piece and the third punching piece are further defined.

[0041] The portion of the first body located between two adjacent first mounting grooves is the first pole portion, and the first inner magnetic bridge includes an annular portion, a plurality of first fixing protrusions and a plurality of first connecting portions.

[0042] The inner peripheral wall of the annular portion encloses a first mounting hole. The first fixing protrusion is connected to the outer peripheral wall of the annular portion. The first fixing protrusion is connected to the outer peripheral wall of the annular portion and is arranged opposite to one first mounting groove. That is to say, each first fixing protrusion cooperates with one first mounting groove. The first fixing protrusion has the function of supporting and fixing the permanent magnet in the first mounting groove. In this way, the matching dimensions between the permanent magnet and the rotating shaft can be ensured, providing a reliable structural support for the effectiveness and feasibility of the motor operation.

[0043] Any one of the plurality of first connecting portions is connected between the outer peripheral wall of the annular portion and the first pole portion. That is to say, the first end of the first connecting portion is connected to the outer peripheral wall of the annular portion, and the second end of the first connecting portion is connected to the first pole portion. It can also be said that the annular portion and the first pole portion are assembled together through the first connecting portion.

[0044] This setting can improve the structural strength of the rotor iron core, reduce the occurrence probability of deformation of the rotor iron core, and ensure the stability and reliability of the motor operation.

[0045] It can be understood that the first installation groove communicates with the first isolation groove. For example, the notch of the first installation groove communicates with the first isolation groove, and either the first fixing protrusion or the first connecting portion is located at the first isolation groove. In this way, it can ensure that the first fixing protrusion has the function of fixing the permanent magnet, and can also meet the use requirement that the first connecting portion is connected between the annular portion and the first pole portion.

[0046] It can be understood that the multiple first connecting portions and the multiple first fixing protrusions are arranged staggeredly. For example, the multiple first connecting portions are arranged at intervals around the first installation hole, the multiple first fixing protrusions are arranged at intervals around the first installation hole, and at least one first fixing protrusion is arranged between any two adjacent first connecting portions.

[0047] When the second iron core structure includes the third punching piece, the third punching piece includes an installation structure. The installation structure includes a second connecting portion, a magnetic pole portion, a first limiting section, and a second limiting section.

[0048] Along the third installation hole to the outer peripheral wall of the third punching piece, the second connecting portion is connected between the second annular portion and the magnetic pole portion. That is, the magnetic pole portion is connected to the second annular portion through the second connecting portion. Along the circumferential direction of the rotor iron core, the magnetic pole portion is connected between the first limiting section and the second limiting section, and either the first limiting section or the second limiting section is arranged away from the second annular portion. The third installation groove is enclosed by two adjacent magnetic pole portions, the second fixing protrusion, the first limiting section, and the second limiting section. It can also be said that two adjacent magnetic pole portions, the second fixing protrusion, the first limiting section, and the second limiting section cooperate to limit the permanent magnet in multiple directions together, avoiding the situation of the permanent magnet shifting, ensuring the running stability of the rotor iron core, and reducing the running noise of the motor.

[0049] It can be understood that the first limiting section encloses a part of the third installation groove, and the second limiting section encloses a part of the third installation groove. The first limiting section and the second limiting section are used to limit the permanent magnet along the radial direction of the rotor iron core, increasing the contact area and contact angle between the magnetic pole portion and the permanent magnet, and can limit the permanent magnet from multiple directions and multiple angles, avoiding the situation of the permanent magnet shifting relative to the rotor iron core during the operation of the motor.

[0050] The first limiting sections and the second limiting sections of two adjacent installation structures are arranged at intervals. In this way, the magnetic field generated by the permanent magnet can form a closed loop through the rotor iron core as fully as possible, suppressing the formation of a magnetic leakage path between the first limiting section and the second limiting section, further improving the magnetic leakage, and enhancing the power density of the motor.

[0051] Each second fixing protrusion is disposed opposite to a third mounting groove. That is, each second fixing protrusion cooperates with a third mounting groove. The second fixing protrusion has the function of supporting and fixing the permanent magnet in the third mounting groove. In this way, the matching dimension between the permanent magnet and the rotating shaft can be ensured, providing a reliable structural support for the effectiveness and feasibility of the motor operation.

[0052] In some embodiments, optionally, the number of the first fixing protrusions is denoted as n1, and the number of the second fixing protrusions is denoted as n2, where n1 + n2 ≥ p, and p is the number of pole pairs of the motor.

[0053] In this embodiment, the matching structure of the first fixing protrusion, the second fixing protrusion and the number of pole pairs of the motor is further defined. The number of the first fixing protrusions is denoted as n1, the number of the second fixing protrusions is denoted as n2, and the number of pole pairs of the motor is denoted as p. n1, n2 and p satisfy n1 + n2 ≥ p.

[0054] This setting ensures the matching relationship between the number of the first fixing protrusions and the second fixing protrusions and the permanent magnet. Each permanent magnet corresponds to a first fixing protrusion and / or a second fixing protrusion. The first fixing protrusion and the second fixing protrusion cooperate to effectively limit the permanent magnet. In this way, the matching dimension between the permanent magnet and the rotating shaft can be ensured, providing a reliable structural support for the effectiveness and feasibility of the motor operation, and being beneficial to reducing the running noise of the motor.

[0055] In some embodiments, optionally, the number of the first connecting portions is denoted as k1, where k1 = 2 × p, and p is the number of pole pairs of the motor.

[0056] In this embodiment, the matching structure of the first connecting portion and the number of pole pairs of the motor is further defined. The number of the first connecting portions is denoted as k1, and the number of pole pairs of the motor is denoted as p. The relationship between k1 and p satisfies k1 = 2 × p. That is, a first connecting portion is provided for cooperation with the first pole portion. In this way, while ensuring the structural strength of the rotor core, the material input of the first connecting portion is reduced, which is beneficial to reducing magnetic leakage, improving the torque density of the motor, and reducing torque ripple and cogging torque.

[0057] In some embodiments, optionally, the number of the second connecting portions is denoted as k2, where k2 = 2 × p, and p is the number of pole pairs of the motor.

[0058] In this embodiment, the mating structure between the second connecting portion and the number of pole pairs of the motor is further defined. Let the number of the second connecting portions be denoted as k2, and the number of pole pairs of the motor be denoted as p. The relationship between k2 and p satisfies k2 = 2×p. That is, one second connecting portion is provided for mating with the magnetic pole portion. In this way, while ensuring the structural strength of the rotor core, the material input of the second connecting portion is reduced, which is beneficial to reducing magnetic leakage, improving the torque density of the motor, and reducing torque ripple and cogging torque.

[0059] In some embodiments, optionally, any one of the first fixing protrusion and the second fixing protrusion includes at least one of a strip segment and an arc segment; and / or any one of the first connecting portion and the second connecting portion includes at least one of a strip segment and an arc segment.

[0060] In this embodiment, the shapes of the first fixing protrusion, the second fixing protrusion, the first connecting portion, and the second connecting portion are further defined.

[0061] Among them, the first fixing protrusion includes a strip segment and / or an arc segment. For example, the first fixing protrusion includes a strip segment, for example, the first fixing protrusion includes an arc segment, for example, the first fixing protrusion includes a strip segment and an arc segment.

[0062] Among them, the second fixing protrusion includes a strip segment and / or an arc segment. For example, the second fixing protrusion includes a strip segment, for example, the second fixing protrusion includes an arc segment, for example, the second fixing protrusion includes a strip segment and an arc segment.

[0063] Among them, the first connecting portion includes at least one of a strip segment and an arc segment. For example, the first connecting portion includes a strip segment, for example, the first connecting portion includes an arc segment, for example, the first connecting portion includes a strip segment and an arc segment.

[0064] Among them, the second connecting portion includes at least one of a strip segment and an arc segment. For example, the second connecting portion includes a strip segment, for example, the second connecting portion includes an arc segment, for example, the second connecting portion includes a strip segment and an arc segment.

[0065] In some embodiments, optionally, when the second iron core structure includes a second punching sheet, the distance from the center of the first mounting hole to the outer peripheral wall of the first punching sheet is greater than or equal to the distance from the center of the second mounting hole to the outer peripheral wall of the second punching sheet; when the second iron core structure includes a third punching sheet, the distance from the center of the first mounting hole to the outer peripheral wall of the first punching sheet is greater than or equal to the distance from the center of the third mounting hole to the outer peripheral wall of the third punching sheet.

[0066] In this embodiment, the structure of the rotor core is further defined, such that the distance from the center of the first mounting hole to the outer peripheral wall of the first punching sheet is denoted as d1, the distance from the center of the second mounting hole to the outer peripheral wall of the second punching sheet is denoted as d2, and the distance from the center of the third mounting hole to the outer peripheral wall of the third punching sheet is denoted as d3.

[0067] When the second iron core structure includes the second punching sheet, d1 ≥ d2. That is, along the axial direction of the rotor iron core, projecting onto the first punching sheet, in the projection, the contour line of the second punching sheet is located inside the contour line of the first punching sheet, or a part of the contour line of the second punching sheet coincides with the contour line of the first punching sheet. That is, the contour line of the second punching sheet does not exceed the contour line of the first punching sheet. This setting can ensure the mating dimensions between the rotor and the stator of the motor, providing structural support for ensuring the stable operation of the motor.

[0068] When the second iron core structure includes the third punching sheet, d1 ≥ d3. That is, along the axial direction of the rotor iron core, projecting onto the first punching sheet, in the projection, the contour line of the third punching sheet is located inside the contour line of the first punching sheet, or a part of the contour line of the third punching sheet coincides with the contour line of the first punching sheet. That is, the contour line of the third punching sheet does not exceed the contour line of the first punching sheet. This setting can ensure the mating dimensions between the rotor and the stator of the motor, providing structural support for ensuring the stable operation of the motor.

[0069] When the second iron core structure includes the second punching sheet and the third punching sheet, d1 ≥ d2, d1 ≥ d3.

[0070] A second aspect of the present invention provides a rotor, comprising: a rotor iron core as in any one of the embodiments of the first aspect; and a plurality of permanent magnets, with one permanent magnet arranged in any one of the plurality of slots of the rotor iron core.

[0071] The rotor provided by the present invention includes a rotor iron core and a plurality of permanent magnets. Since the rotor includes the rotor iron core as in any one of the embodiments of the first aspect, it thus has all the beneficial effects of the above rotor iron core, and will not be elaborated one by one here.

[0072] A third aspect of the present invention provides a motor, comprising: the rotor as in the second aspect.

[0073] The motor provided by the present invention includes the rotor as in the second aspect, and thus has all the beneficial effects of the above rotor, and will not be elaborated one by one here.

[0074] A fourth aspect of the present invention provides a chassis system, comprising: the rotor as in the second aspect; or the motor as in the third aspect.

[0075] The chassis system provided by the present invention includes the rotor as in the second aspect, or the motor as in the third aspect, and thus has all the beneficial effects of the above rotor or motor, and will not be elaborated one by one here.

[0076] A fifth aspect of the present invention provides a vehicle, comprising: the rotor as in the second aspect; or the motor as in the third aspect; or the chassis system as in the fourth aspect.

[0077] The vehicle provided by the present invention includes a rotor as in the second aspect, or a motor as in the third aspect, or a chassis system as in the fourth aspect. Therefore, it has all the beneficial effects of one of the above rotor, motor, and chassis system, and will not be elaborated one by one here.

[0078] It should be noted that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0079] The additional aspects and advantages of the present application will become apparent in the following description section or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] The above and / or additional aspects and advantages of the present application will become apparent and be easily understood from the description of the embodiments in conjunction with the following drawings, where:

[0081] Figure 1 shows a schematic structural diagram of a rotor core according to an embodiment of the present application;

[0082] Figure 2 shows an exploded view of a rotor core according to an embodiment of the present application;

[0083] Figure 3 shows a schematic structural diagram of a first punching piece according to the first embodiment of the present application;

[0084] Figure 4 shows a schematic structural diagram of a second punching piece according to an embodiment of the present application;

[0085] Figure 5 shows a schematic structural diagram of a third punching piece according to an embodiment of the present application;

[0086] Figure 6 shows a schematic structural diagram of a first punching piece according to the second embodiment of the present application;

[0087] Figure 7 shows a schematic structural diagram of a first punching piece according to the third embodiment of the present application;

[0088] Figure 8 shows a schematic structural diagram of a first punching piece according to the fourth embodiment of the present application;

[0089] Figure 9 shows a data curve graph of the cogging torque of the present application varying with X;

[0090] Figure 10 shows a data curve graph of the output torque of the present application varying with X.

[0091] Wherein, Figures 1 to 8The corresponding relationship between the reference numerals and the component names in the following is:

[0092] 1 Rotor core, 10 First core structure, 100 First punching sheet, 110 First body, 120 First mounting hole, 130 First mounting groove, 140 First inner magnetic bridge, 141 Annular portion, 143 First fixing protrusion, 144 First connecting portion, 150 First outer magnetic bridge, 160 First pole portion, 170 First isolation groove, 20 Second core structure, 200 Second punching sheet, 210 First annular portion, 220 Second body, 230 Second mounting hole, 240 Second mounting groove, 250 Second inner magnetic bridge, 260 Second outer magnetic bridge, 300 Third punching sheet, 310 Second annular portion, 320 Mounting structure, 321 Second connecting portion, 322 Magnetic pole portion, 323 First limiting section, 324 Second limiting section, 330 Third mounting hole, 340 Third mounting groove, 350 Second isolation groove, 360 Second fixing protrusion, 40 Shaft hole, 50 Slot. Detailed implementation manners

[0093] In order to more clearly understand the above objects, features, and advantages of the present application, the present application will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0094] Many specific details are set forth in the following description in order to fully understand the present application. However, the present application may be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0095] The following refers to Figures 1 to 10 A rotor core 1, a rotor, an electric motor, a chassis system, and a vehicle according to some embodiments of the present application.

[0096] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 shown, a rotor core 1 according to some embodiments of the present application includes a first core structure 10 and a second core structure 20.

[0097] The first core structure 10 includes a first punching sheet 100.

[0098] The first punching sheet 100 includes a first body 110.

[0099] The first body 110 is provided with a first mounting hole 120 and a plurality of first mounting grooves 130.

[0100] A plurality of first mounting grooves 130 are arranged at intervals around the first mounting hole 120.

[0101] The portion of the first body 110 between the first mounting hole 120 and the first mounting grooves 130 includes a first inner magnetic bridge 140 and a first isolation groove 170.

[0102] The portion of the first body 110 between the first mounting grooves 130 and the outer peripheral wall of the first body 110 is the first outer magnetic bridge 150.

[0103] The second iron core structure 20 is stacked with the first punching sheet 100.

[0104] The second iron core structure 20 includes at least one of a second punching sheet 200 and a third punching sheet 300.

[0105] The second punching sheet 200 includes a first annular portion 210 and a second body 220.

[0106] The second body 220 surrounds the first annular portion 210.

[0107] The first annular portion 210 and the second body 220 are arranged at intervals.

[0108] The inner peripheral wall of the first annular portion 210 encloses a second mounting hole 230.

[0109] The second body 220 is provided with a plurality of second mounting grooves 240.

[0110] A plurality of second mounting grooves 240 are arranged at intervals around the second mounting hole 230.

[0111] The second mounting grooves 240 extend from the inner peripheral wall of the second body 220 to the outer peripheral wall of the second body 220.

[0112] The portion of the second punching sheet 200 between the second mounting hole 230 and the second mounting grooves 240 is the second inner magnetic bridge 250.

[0113] The portion of the second body 220 between the second mounting grooves 240 and the outer peripheral wall of the second body 220 is the second outer magnetic bridge 260.

[0114] The third punching sheet 300 includes a second annular portion 310 and a plurality of mounting structures 320.

[0115] The inner peripheral wall of the second annular portion 310 encloses a third mounting hole 330.

[0116] A plurality of mounting structures 320 are arranged at intervals around the third mounting hole 330.

[0117] The mounting structures 320 are connected to the outer peripheral wall of the second annular portion 310.

[0118] The second annular portion 310 and two adjacent mounting structures 320 enclose a third mounting groove 340.

[0119] The portion of the third punching sheet 300 located between the third mounting hole 330 and the third mounting groove 340 is a second isolation groove 350.

[0120] A rotor core 1 provided by the present application includes a first core structure 10 and a second core structure 20.

[0121] The first core structure 10 includes a first punching sheet 100, and the second core structure 20 is stacked with the first punching sheet 100.

[0122] The second core structure 20 includes at least one of a second punching sheet 200 and a third punching sheet 300, that is, the second core structure 20 includes the second punching sheet 200, or the second core structure 20 includes the third punching sheet 300, or the second core structure 20 includes the second punching sheet 200 and the third punching sheet 300. When the second core structure 20 includes the second punching sheet 200 and the third punching sheet 300, the first punching sheet 100, the second punching sheet 200, and the third punching sheet 300 are stacked.

[0123] Specifically, the first punching sheet 100 includes a first body 110. The first body 110 is provided with a first mounting hole 120 and a plurality of first mounting grooves 130. The plurality of first mounting grooves 130 are arranged at intervals around the first mounting hole 120. The first mounting grooves 130 are used for mounting permanent magnets. The first mounting grooves 130 are arranged at intervals with respect to the first mounting hole 120, and the first mounting grooves 130 are arranged at intervals with respect to the outer peripheral wall of the first punching sheet 100.

[0124] The portion of the first body 110 located between two adjacent first mounting grooves 130 is a first pole portion 160. The portion of the first body 110 located between the first mounting hole 120 and the first mounting grooves 130 includes a first inner magnetic bridge 140 and a first isolation groove 170. The portion of the first body 110 located between the first mounting grooves 130 and the outer peripheral wall of the first body 110 is a first outer magnetic bridge 150. It can also be said that the first mounting hole 120 and the first mounting grooves 130 are connected by the first inner magnetic bridge 140, and the first mounting grooves 130 and the outer peripheral wall of the first body 110 are connected by the first outer magnetic bridge 150.

[0125] Compared with the related art in which the inner magnetic bridge is removed and the rotor punching sheet is formed by injection molding, the structure of the first punching sheet 100 of the present application can improve the strength of the first core structure 10, can reduce the occurrence probability of deformation of the rotor core 1, and can ensure the stability and reliability of the motor operation.

[0126] Specifically, the second punching sheet 200 includes a first annular portion 210 and a second body 220. The second body 220 surrounds the first annular portion 210, and the first annular portion 210 and the second body 220 are arranged at intervals. That is to say, the second body 220 is of an annular structure, and the second body 220 and the first annular portion 210 are arranged at intervals. In other words, the second body 220 and the first annular portion 210 are disconnected. It can be understood that the inner peripheral wall of the first annular portion 210 encloses a second mounting hole 230, and the outer peripheral wall of the first annular portion 210 is disconnected from the inner peripheral wall of the second body 220.

[0127] A part of the inner peripheral wall of the second body 220 is recessed towards the outer peripheral wall of the second body 220 to form a second mounting groove 240. The number of the second mounting grooves 240 is multiple, and the multiple second mounting grooves 240 are arranged at intervals around the second mounting hole 230. The portion of the second body 220 located between two adjacent second mounting grooves 240 is a second pole portion, and the portion of the second body 220 located between the second mounting groove 240 and the outer peripheral wall of the second body 220 is a second outer magnetic bridge 260. The portion of the second punching sheet 200 located between the second mounting hole 230 and the second mounting groove 240 is a second inner magnetic bridge 250. It can also be said that the second mounting groove 240 and the outer peripheral wall of the second body 220 are connected through the second outer magnetic bridge 260. The second mounting groove 240 is used for mounting a permanent magnet.

[0128] By reasonably setting the structure of the second punching sheet 200, magnetic leakage can be reduced, the torque density of the motor can be increased, torque ripple and cogging torque can be reduced, which is beneficial to improving the service performance and market competitiveness of the product.

[0129] Specifically, the third punching sheet 300 includes a second annular portion 310 and a plurality of mounting structures 320. The inner peripheral wall of the second annular portion 310 encloses a third mounting hole 330. The plurality of mounting structures 320 are arranged at intervals around the third mounting hole 330, and any one of the plurality of mounting structures 320 is connected to the outer peripheral wall of the second annular portion 310. The second annular portion 310 and two adjacent mounting structures 320 enclose a third mounting groove 340. That is to say, the portion of the outer peripheral wall of the third punching sheet 300 opposite to the third mounting groove 340 is disconnected to form a notch. The third mounting groove 340 is used for mounting a permanent magnet. The mounting structure 320 forms a third pole portion.

[0130] By reasonably setting the structure of the third punching sheet 300, magnetic leakage can be reduced, the magnetic flux concentrating effect of the rotor core 1 is good, so that the motor has a relatively high maximum output torque and a relatively low back electromotive force voltage. And it is beneficial to improve the power density of the motor. That is, while ensuring the service demand of the power density of the motor, the torque density of the motor can be increased, torque ripple and cogging torque can be reduced, which is beneficial to reducing the volume of the motor and improving the stability and reliability of the motor in use.

[0131] It can be seen from this that by reasonably setting the structure of the rotor core 1, the rotor core 1 includes the first punching sheet 100 and the second punching sheet 200, or the rotor core 1 includes the first punching sheet 100 and the third punching sheet 300, or the rotor core 1 includes the first punching sheet 100, the second punching sheet 200 and the third punching sheet 300. This setting takes into account both the structural strength and the magnetic leakage. While ensuring the structural strength of the rotor core 1, it is beneficial to reduce the magnetic leakage, can improve the torque density of the motor, can reduce the torque ripple and the cogging torque, and is beneficial to improving the performance and market competitiveness of the product.

[0132] Optionally, the first punching sheet 100 and the second punching sheet 200 are assembled and connected by at least one of riveting, welding and gluing.

[0133] Optionally, the first punching sheet 100 and the third punching sheet 300 are assembled and connected by at least one of riveting, welding and gluing.

[0134] Optionally, any two adjacent ones of the first punching sheet 100, the second punching sheet 200 and the third punching sheet 300 are assembled and connected by at least one of riveting, welding and gluing.

[0135] In some embodiments, optionally, as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 shown, at least one of the second mounting hole 230 and the third mounting hole 330 penetrates axially along the rotor core 1 with the first mounting hole 120 to form a shaft hole 40.

[0136] At least one of the second mounting groove 240 and the third mounting groove 340 penetrates axially along the rotor core 1 with the first mounting groove 130 to form a slot 50.

[0137] The height of the first core structure 10 in the axial direction of the rotor core 1 is denoted as L1.

[0138] The width of the slot 50 in the circumferential direction of the rotor core 1 is denoted as Lm.

[0139] The depth of the slot 50 in the direction from the shaft hole 40 to the outer peripheral wall of the rotor core 1 is denoted as Wm.

[0140] The axial height of the rotor core 1 is denoted as H.

[0141] The distance from the center of the shaft hole 40 to the outer peripheral wall of the rotor core 1 is denoted as R1.

[0142] Among them, L1×(Lm + Wm) < π×H×R1.

[0143] In this embodiment, the mating structure of the first iron core structure 10 and the second iron core structure 20 is further defined.

[0144] At least one of the second mounting holes 230 and the third mounting holes 330 penetrates axially along the rotor core 1 with the first mounting hole 120 to form a shaft hole 40, and at least one of the second mounting grooves 240 and the third mounting grooves 340 penetrates axially along the rotor core 1 with the first mounting groove 130 to form a slot 50. The shaft hole 40 is used to cooperate with the rotating shaft of the motor, and a permanent magnet is arranged in the slot 50. The slot 50 has the function of mounting and fixing the permanent magnet. The slot wall of the slot 50 can limit the permanent magnet in multiple directions, restrict the movement path of the permanent magnet, and avoid the situation that the permanent magnet shifts during the operation of the motor, resulting in an increase in the operating noise of the motor.

[0145] Further, along the axial direction of the rotor core 1, the height of the first iron core structure 10 is denoted as L1. Along the circumferential direction of the rotor core 1, the width of the slot 50 is denoted as Lm. Along the direction from the shaft hole 40 to the outer peripheral wall of the rotor core 1, the depth of the slot 50 is denoted as Wm. The axial height of the rotor core 1 is denoted as H. The distance from the center of the shaft hole 40 to the outer peripheral wall of the rotor core 1 is denoted as R1. Among them, the relationship between L1, Lm, Wm, H, and R1 satisfies: L1×(Lm + Wm) < π×H×R1. This setting limits the material input of the first iron core structure 10 relative to the second iron core structure 20. For example, it limits the proportion of the axial length of the first iron core structure 10, that is, it limits the material input ratio of the first iron core structure 10 and the rotor core 1. In this way, it takes into account both the structural strength and the magnetic leakage. While ensuring the structural strength of the rotor core 1, it is beneficial to reduce the magnetic leakage, can improve the torque density of the motor, can reduce the torque ripple and the cogging torque, and is beneficial to improving the use performance and market competitiveness of the product.

[0146] Optionally, as Figure 2 shown, L1 = L11 + L12. That is to say, when any one of the axial ends of the second iron core structure 20 is stacked with the first punching sheet 100, the axial height of the first iron core structure 10 is equal to the sum of the axial heights of the first punching sheets 100 on both sides. L11 represents the axial height of the first punching sheet 100 on one side, and L12 represents the axial height of the first punching sheet 100 on the other side.

[0147] The rotor core 1 is sectioned along the axial direction perpendicular to the rotor core 1. In the section, the contour line of the slot 50 includes a first line segment and a second line segment, and the first line segment and the second line segment are arranged at intervals along the circumferential direction of the rotor core 1. The point on the first line segment is denoted as the first point, and along the circumferential direction of the rotor core 1, the point on the second line segment opposite to the first point is denoted as the second point, and the distance from the first point to the second point is denoted as Lm.

[0148] Take a cross-section of the rotor core 1 along the axial direction perpendicular to the rotor core 1. In the cross-section, the contour line of the slot 50 includes a slot bottom and a slot opening, and the slot bottom and the slot opening are arranged at intervals along the direction from the shaft hole 40 to the outer peripheral wall of the rotor core 1. The point on the slot bottom is denoted as the third point, and along the direction from the shaft hole 40 to the outer peripheral wall of the rotor core 1, the point on the slot opening opposite to the third point is denoted as the fourth point, and the distance from the third point to the fourth point is denoted as Wm.

[0149] In some embodiments, optionally, L1, Lm, Wm, H, and R1 satisfy: 0 < (L1×(Lm + Wm)) / (π×H×R1) ≤ 0.6.

[0150] In this embodiment, the mating structure of the first iron core structure 10 and the second iron core structure 20 is further defined. The relationship of L1, Lm, Wm, H, and R1 is defined to satisfy: 0 < (L1×(Lm + Wm)) / (π×H×R1) ≤ 0.6.

[0151] This setting reduces the torque ripple and cogging torque while ensuring sufficient motor output torque, which is beneficial to reducing the running noise of the motor and improving the service performance and market competitiveness of the product.

[0152] Optionally, (L1×(Lm + Wm)) / (π×H×R1) = 0.3, (L1×(Lm + Wm)) / (π×H×R1) = 0.35, (L1×(Lm + Wm)) / (π×H×R1) = 0.4, (L1×(Lm + Wm)) / (π×H×R1) = 0.45, (L1×(Lm + Wm)) / (π×H×R1) = 0.5, (L1×(Lm + Wm)) / (π×H×R1) = 0.55, etc., which are not listed one by one here.

[0153] In some embodiments, optionally, L1, Lm, Wm, H, and R1 satisfy: 0 < (L1×(Lm + Wm)) / (π×H×R1) ≤ 0.26.

[0154] In this embodiment, the mating structure of the first iron core structure 10 and the second iron core structure 20 is further defined. The relationship of L1, Lm, Wm, H, and R1 is defined to satisfy: 0 < (L1×(Lm + Wm)) / (π×H×R1) ≤ 0.26.

[0155] This setting further optimizes the torque ripple and cogging torque while ensuring sufficient motor output torque, which is beneficial to reducing the running noise of the motor and improving the service performance and market competitiveness of the product.

[0156] Optionally, (L1×(Lm+Wm)) / (π×H×R1) = 0.5, (L1×(Lm+Wm)) / (π×H×R1) = 0.1, (L1×(Lm+Wm)) / (π×H×R1) = 0.13, (L1×(Lm+Wm)) / (π×H×R1) = 0.15, (L1×(Lm+Wm)) / (π×H×R1) = 0.2, (L1×(Lm+Wm)) / (π×H×R1) = 0.25, etc., which are not listed one by one here.

[0157] In some embodiments, optionally, the first iron core structure 10 includes a plurality of first punching sheets 100.

[0158] Axially along the rotor iron core 1, the plurality of first punching sheets 100 are stacked on the same side of the second iron core structure 20.

[0159] In this embodiment, the mating structure of the first iron core structure 10 and the second iron core structure 20 is further defined. The first iron core structure 10 includes a plurality of first punching sheets 100, and the plurality of first punching sheets 100 are stacked on the same axial side of the second iron core structure 20. Specifically, axially along the rotor iron core 1, the plurality of first punching sheets 100 are stacked on one side of the second iron core structure 20. That is to say, any one of the plurality of first punching sheets 100 is located on one side of the second iron core structure 20 in the axial direction.

[0160] In some embodiments, optionally, as Figure 2 shown, the first iron core structure 10 includes a plurality of first punching sheets 100.

[0161] Axially along the rotor iron core 1, a part of the plurality of first punching sheets 100 are stacked on one side of the second iron core structure 20.

[0162] Another part of the plurality of first punching sheets 100 are stacked on the other side of the second iron core structure 20.

[0163] In this embodiment, the mating structure of the first iron core structure 10 and the second iron core structure 20 is further defined. The first iron core structure 10 includes a plurality of first punching sheets 100, a part of the plurality of first punching sheets 100 are stacked on one side of the second iron core structure 20, and another part of the plurality of first punching sheets 100 are stacked on the other side of the second iron core structure 20. That is to say, the second iron core structure 20 is clamped in the middle of the plurality of first punching sheets 100. The plurality of first punching sheets 100 fix the second punching sheet 200 and / or the third punching sheet 300 of the second iron core structure 20 from multiple directions, increasing the contact area and contact angle between the first punching sheets 100 and the second iron core structure 20, which is beneficial to improving the stability and reliability of the assembly of the first iron core structure 10 and the second iron core structure 20.

[0164] Axially along the rotor core 1, the second core structure 20 has a first side and a second side.

[0165] Optionally, a first punching piece 100 is stacked on the first side of the second core structure 20, and a first punching piece 100 is stacked on the second side of the second core structure 20.

[0166] Optionally, a plurality of first punching pieces 100 are stacked on the first side of the second core structure 20, and a first punching piece 100 is stacked on the second side of the second core structure 20.

[0167] Optionally, a first punching piece 100 is stacked on the first side of the second core structure 20, and a plurality of first punching pieces 100 are stacked on the second side of the second core structure 20.

[0168] Optionally, a plurality of first punching pieces 100 are stacked on the first side of the second core structure 20, and a plurality of first punching pieces 100 are stacked on the second side of the second core structure 20.

[0169] It can be understood that "a plurality" refers to two or more.

[0170] In some embodiments, optionally, as Figure 3 , Figure 6 , Figure 7 and Figure 8 shown, the part of the first body 110 located between two adjacent first mounting grooves 130 is the first pole part 160.

[0171] The first inner magnetic bridge 140 includes an annular portion 141, a plurality of first fixing protrusions 143 and a plurality of first connecting portions 144.

[0172] The inner peripheral wall of the annular portion 141 encloses a first mounting hole 120.

[0173] The outer peripheral wall of the annular portion 141 is arranged at an interval from the first pole part 160 to enclose a first isolation groove 170.

[0174] The first mounting groove 130 communicates with the first isolation groove 170.

[0175] The first fixing protrusion 143 is connected to the outer peripheral wall of the annular portion 141.

[0176] The first fixing protrusion 143 is disposed opposite to a first mounting groove 130.

[0177] The first connecting portion 144 is connected between the outer peripheral wall of the annular portion 141 and the first pole part 160.

[0178] The plurality of first connecting portions 144 and the plurality of first fixing protrusions 143 are arranged staggeredly.

[0179] As Figure 5As shown, when the second iron core structure 20 includes the third punching sheet 300, the mounting structure 320 includes a second connecting portion 321, a magnetic pole portion 322, a first limiting section 323, and a second limiting section 324.

[0180] Along the outer peripheral wall of the third mounting hole 330 to the third punching sheet 300, the second connecting portion 321 is connected between the second annular portion 310 and the magnetic pole portion 322.

[0181] Along the circumferential direction of the rotor iron core 1, the magnetic pole portion 322 is connected between the first limiting section 323 and the second limiting section 324, and either the first limiting section 323 or the second limiting section 324 is arranged away from the second annular portion 310.

[0182] A plurality of second fixing protrusions 360 are provided on the outer peripheral wall of the second annular portion 310.

[0183] The second fixing protrusion 360 is arranged opposite to a third mounting groove 340.

[0184] In this embodiment, the structures of the first punching sheet 100 and the third punching sheet 300 are further defined.

[0185] The part of the first body 110 located between two adjacent first mounting grooves 130 is the first pole portion 160. The first inner magnetic bridge 140 includes an annular portion 141, a plurality of first fixing protrusions 143, and a plurality of first connecting portions 144.

[0186] The inner peripheral wall of the annular portion 141 encloses the first mounting hole 120. The first fixing protrusion 143 is connected to the outer peripheral wall of the annular portion 141. The first fixing protrusion 143 is connected to the outer peripheral wall of the annular portion 141, and the first fixing protrusion 143 is arranged opposite to a first mounting groove 130. That is to say, the first fixing protrusion 143 cooperates with a first mounting groove 130. The first fixing protrusion 143 has the function of supporting and fixing the permanent magnet in the first mounting groove 130. In this way, the matching dimensions of the permanent magnet and the rotating shaft can be ensured, providing a reliable structural support for the effectiveness and feasibility of the motor operation.

[0187] Any one of the plurality of first connecting portions 144 is connected between the outer peripheral wall of the annular portion 141 and the first pole portion 160. That is, the first end of the first connecting portion 144 is connected to the outer peripheral wall of the annular portion 141, and the second end of the first connecting portion 144 is connected to the first pole portion 160. It can also be said that the annular portion 141 and the first pole portion 160 are assembled together through the first connecting portion 144.

[0188] This setting can improve the structural strength of the rotor iron core 1, reduce the occurrence probability of deformation of the rotor iron core 1, and ensure the stability and reliability of the motor operation.

[0189] Optionally, the first fixing protrusion 143 extends from the outer peripheral wall of the annular portion 141 towards the first mounting groove 130.

[0190] Optionally, the first fixing protrusion 143 is located between the outer peripheral wall of the annular portion 141 and the first mounting groove 130.

[0191] Optionally, a part of the first fixing protrusion 143 extends into the mounting groove.

[0192] It can be understood that the first mounting groove 130 communicates with the first isolation groove 170. For example, the notch of the first mounting groove 130 communicates with the first isolation groove 170, and either the first fixing protrusion 143 or the first connecting portion 144 is located at the first isolation groove 170. In this way, it can be ensured that the first fixing protrusion 143 has the function of fixing the permanent magnet, and the use requirement that the first connecting portion 144 is connected between the annular portion 141 and the first pole portion 160 can also be satisfied.

[0193] It can be understood that the plurality of first connecting portions 144 and the plurality of first fixing protrusions 143 are arranged staggeredly. For example, the plurality of first connecting portions 144 are arranged at intervals around the first mounting hole 120, the plurality of first fixing protrusions 143 are arranged at intervals around the first mounting hole 120, and at least one first fixing protrusion 143 is provided between any two adjacent first connecting portions 144.

[0194] When the second iron core structure 20 includes the third punching sheet 300, the third punching sheet 300 includes a mounting structure 320. The mounting structure 320 includes a second connecting portion 321, a pole portion 322, a first limiting section 323, and a second limiting section 324.

[0195] Along the third mounting hole 330 to the outer peripheral wall of the third punching sheet 300, the second connecting portion 321 is connected between the second annular portion 310 and the pole portion 322. That is, the pole portion 322 is connected to the second annular portion 310 through the second connecting portion 321. Along the circumferential direction of the rotor iron core 1, the pole portion 322 is connected between the first limiting section 323 and the second limiting section 324, and either the first limiting section 323 or the second limiting section 324 is arranged away from the second annular portion 310. The adjacent two pole portions 322, the second fixing protrusion 360, the first limiting section 323, and the second limiting section 324 enclose a third mounting groove 340. It can also be said that the adjacent two pole portions 322, the second fixing protrusion 360, the first limiting section 323, and the second limiting section 324 cooperate to limit the permanent magnet in multiple directions together, avoid the situation of permanent magnet displacement, can ensure the running stability of the rotor iron core 1, and can reduce the running noise of the motor.

[0196] It can be understood that the first limiting section 323 encloses a part of the third installation groove 340, and the second limiting section 324 encloses a part of the third installation groove 340. The first limiting section 323 and the second limiting section 324 are used to limit the permanent magnet along the radial direction of the rotor core 1, increasing the contact area and contact angle between the magnetic pole portion 322 and the permanent magnet. The permanent magnet can be limited from multiple directions and angles, avoiding the situation that the permanent magnet shifts relative to the rotor core 1 during the operation of the motor.

[0197] The first limiting sections 323 and the second limiting sections 324 of two adjacent mounting structures 320 are arranged at intervals. In this way, the magnetic field generated by the permanent magnet can form a closed loop through the rotor core 1 as fully as possible, suppressing the formation of a magnetic leakage path between the first limiting section 323 and the second limiting section 324, and further improving the magnetic leakage and enhancing the power density of the motor.

[0198] The second fixing protrusion 360 is disposed opposite to a third installation groove 340. That is to say, the second fixing protrusion 360 cooperates with a third installation groove 340. The second fixing protrusion 360 has the function of supporting and fixing the permanent magnet in the third installation groove 340. In this way, the matching dimension between the permanent magnet and the rotating shaft can be ensured, providing a reliable structural support for the effectiveness and feasibility of the motor operation.

[0199] In some embodiments, optionally, the number of the first fixing protrusions 143 is denoted as n1.

[0200] The number of the second fixing protrusions 360 is denoted as n2.

[0201] Wherein, n1 + n2 ≥ p.

[0202] p is the number of pole pairs of the motor.

[0203] In this embodiment, the matching structure of the first fixing protrusion 143, the second fixing protrusion 360 and the number of pole pairs of the motor is further defined. The number of the first fixing protrusions 143 is denoted as n1, the number of the second fixing protrusions 360 is denoted as n2, and the number of pole pairs of the motor is denoted as p. n1, n2 and p satisfy n1 + n2 ≥ p.

[0204] This setting ensures the matching relationship between the number of the first fixing protrusions 143 and the second fixing protrusions 360 and the permanent magnet. The permanent magnet corresponds to one first fixing protrusion 143 and / or one second fixing protrusion 360. The first fixing protrusion 143 and the second fixing protrusion 360 cooperate to effectively limit the permanent magnet. In this way, the matching dimension between the permanent magnet and the rotating shaft can be ensured, providing a reliable structural support for the effectiveness and feasibility of the motor operation, and being beneficial to reducing the operation noise of the motor.

[0205] In some embodiments, optionally, the number of the first connecting portions 144 is denoted as k1.

[0206] Among them, k1 = 2×p.

[0207] p is the number of pole pairs of the motor.

[0208] In this embodiment, the matching structure of the first connecting portion 144 and the number of pole pairs of the motor is further defined. Let the number of the first connecting portions 144 be denoted as k1, the number of pole pairs of the motor be denoted as p, and the relationship between k1 and p satisfies k1 = 2×p. That is, one first connecting portion 144 is provided on the first pole portion 160 for matching therewith. In this way, while ensuring the structural strength of the rotor core 1, the material input of the first connecting portion 144 is reduced, which is beneficial to reducing magnetic leakage, improving the torque density of the motor, and reducing torque ripple and cogging torque.

[0209] In some embodiments, optionally, the number of the second connecting portions 321 is denoted as k2.

[0210] Among them, k2 = 2×p.

[0211] p is the number of pole pairs of the motor.

[0212] In this embodiment, the matching structure of the second connecting portion 321 and the number of pole pairs of the motor is further defined. Let the number of the second connecting portions 321 be denoted as k2, the number of pole pairs of the motor be denoted as p, and the relationship between k2 and p satisfies k2 = 2×p. That is, one second connecting portion 321 is provided on the magnetic pole portion 322 for matching therewith. In this way, while ensuring the structural strength of the rotor core 1, the material input of the second connecting portion 321 is reduced, which is beneficial to reducing magnetic leakage, improving the torque density of the motor, and reducing torque ripple and cogging torque.

[0213] In some embodiments, optionally, as Figure 3 , Figure 6 , Figure 7 and Figure 8 shown, any one of the first fixing protrusion 143 and the second fixing protrusion 360 includes at least one of a strip segment and an arc segment.

[0214] and / or any one of the first connecting portion 144 and the second connecting portion 321 includes at least one of a strip segment and an arc segment.

[0215] In this embodiment, the shapes of the first fixing protrusion 143, the second fixing protrusion 360, the first connecting portion 144 and the second connecting portion 321 are further defined.

[0216] Among them, the first fixing protrusion 143 includes a strip segment and / or an arc segment. For example, the first fixing protrusion 143 includes a strip segment, for example, the first fixing protrusion 143 includes an arc segment, for example, the first fixing protrusion 143 includes a strip segment and an arc segment.

[0217] Among them, the second fixing protrusion 360 includes a strip segment and / or an arc segment. For example, the second fixing protrusion 360 includes a strip segment. For example, the second fixing protrusion 360 includes an arc segment. For example, the second fixing protrusion 360 includes a strip segment and an arc segment.

[0218] Among them, the first connecting portion 144 includes at least one of a strip segment and an arc segment. For example, the first connecting portion 144 includes a strip segment. For example, the first connecting portion 144 includes an arc segment. For example, the first connecting portion 144 includes a strip segment and an arc segment.

[0219] Among them, the second connecting portion 321 includes at least one of a strip segment and an arc segment. For example, the second connecting portion 321 includes a strip segment. For example, the second connecting portion 321 includes an arc segment. For example, the second connecting portion 321 includes a strip segment and an arc segment.

[0220] In some embodiments, optionally, when the second iron core structure 20 includes the second punching sheet 200, the distance from the center of the first mounting hole 120 to the outer peripheral wall of the first punching sheet 100 is greater than or equal to the distance from the center of the second mounting hole 230 to the outer peripheral wall of the second punching sheet 200.

[0221] When the second iron core structure 20 includes the third punching sheet 300, the distance from the center of the first mounting hole 120 to the outer peripheral wall of the first punching sheet 100 is greater than or equal to the distance from the center of the third mounting hole 330 to the outer peripheral wall of the third punching sheet 300.

[0222] In this embodiment, the structure of the rotor iron core 1 is further defined such that the distance from the center of the first mounting hole 120 to the outer peripheral wall of the first punching sheet 100 is denoted as d1, the distance from the center of the second mounting hole 230 to the outer peripheral wall of the second punching sheet 200 is denoted as d2, and the distance from the center of the third mounting hole 330 to the outer peripheral wall of the third punching sheet 300 is denoted as d3.

[0223] When the second iron core structure 20 includes the second punching sheet 200, d1≥d2. That is, along the axial direction of the rotor iron core 1, when projected onto the first punching sheet 100, in the projection, the contour line of the second punching sheet 200 is located inside the contour line of the first punching sheet 100, or a part of the contour line of the second punching sheet 200 coincides with the contour line of the first punching sheet 100. That is, the contour line of the second punching sheet 200 does not exceed the contour line of the first punching sheet 100. This setting can ensure the matching dimensions between the rotor and the stator of the motor and provide structural support for ensuring the stable operation of the motor.

[0224] When the second iron core structure 20 includes the third punching sheet 300, d1≥d3. That is, along the axial direction of the rotor iron core 1, projecting onto the first punching sheet 100, in the projection, the contour line of the third punching sheet 300 is located inside the contour line of the first punching sheet 100, or a part of the contour line of the third punching sheet 300 coincides with the contour line of the first punching sheet 100. That is, the contour line of the third punching sheet 300 does not exceed the contour line of the first punching sheet 100. This setting can ensure the mating dimensions between the rotor and the stator of the motor, providing structural support for ensuring the stable operation of the motor.

[0225] When the second iron core structure 20 includes the second punching sheet 200 and the third punching sheet 300, d1≥d2, d1≥d3.

[0226] A rotor according to some other embodiments of the present application includes: a rotor iron core 1 as in any of the above embodiments and a plurality of permanent magnets.

[0227] One permanent magnet is arranged in any one of the plurality of slots 50 of the rotor iron core 1.

[0228] A rotor provided by the present application includes a rotor iron core 1 and a plurality of permanent magnets.

[0229] The rotor iron core 1 includes a first iron core structure 10 and a second iron core structure 20.

[0230] The first iron core structure 10 includes a first punching sheet 100, and the second iron core structure 20 is stacked with the first punching sheet 100.

[0231] The second iron core structure 20 includes at least one of the second punching sheet 200 and the third punching sheet 300. That is, the second iron core structure 20 includes the second punching sheet 200, or the second iron core structure 20 includes the third punching sheet 300, or the second iron core structure 20 includes the second punching sheet 200 and the third punching sheet 300. When the second iron core structure 20 includes the second punching sheet 200 and the third punching sheet 300, the first punching sheet 100, the second punching sheet 200, and the third punching sheet 300 are stacked.

[0232] Specifically, the first punching sheet 100 includes a first body 110. The first body 110 is provided with a first mounting hole 120 and a plurality of first mounting grooves 130. The plurality of first mounting grooves 130 are arranged at intervals around the first mounting hole 120. The first mounting grooves 130 are used for mounting permanent magnets. The first mounting grooves 130 are arranged at intervals with the first mounting hole 120, and the first mounting grooves 130 are arranged at intervals with the outer peripheral wall of the first punching sheet 100.

[0233] The part of the first body 110 located between two adjacent first mounting grooves 130 is the first pole part 160. The part of the first body 110 located between the first mounting hole 120 and the first mounting groove 130 is the first inner magnetic bridge 140. The part of the first body 110 located between the first mounting groove 130 and the outer peripheral wall of the first body 110 is the first outer magnetic bridge 150. In other words, the first mounting hole 120 and the first mounting groove 130 are connected by the first inner magnetic bridge 140, and the first mounting groove 130 and the outer peripheral wall of the first body 110 are connected by the first outer magnetic bridge 150.

[0234] Compared with the related art where the inner magnetic bridge is removed and the rotor punching is formed by injection molding, the structure of the first punching 100 of the present application can improve the strength of the first iron core structure 10, reduce the occurrence probability of deformation of the rotor iron core 1, and ensure the stability and reliability of the motor operation.

[0235] Specifically, the second punching 200 includes a first annular portion 210 and a second body 220. The second body 220 surrounds the first annular portion 210, and the first annular portion 210 and the second body 220 are arranged at intervals. That is, the second body 220 is of an annular structure and is arranged at intervals with the first annular portion 210. In other words, the second body 220 and the first annular portion 210 are disconnected. It can be understood that the inner peripheral wall of the first annular portion 210 encloses a second mounting hole 230, and the outer peripheral wall of the first annular portion 210 is disconnected from the inner peripheral wall of the second body 220.

[0236] A part of the inner peripheral wall of the second body 220 is recessed toward the outer peripheral wall of the second body 220 to form a second mounting groove 240. The number of the second mounting grooves 240 is multiple, and the multiple second mounting grooves 240 are arranged at intervals around the second mounting hole 230. The part of the second body 220 located between two adjacent second mounting grooves 240 is the second pole part. The part of the second body 220 located between the second mounting groove 240 and the outer peripheral wall of the second body 220 is the second outer magnetic bridge 260. The part of the second punching 200 located between the second mounting hole 230 and the second mounting groove 240 is the second inner magnetic bridge 250. In other words, the second mounting groove 240 and the outer peripheral wall of the second body 220 are connected by the second outer magnetic bridge 260. The second mounting groove 240 is used for mounting a permanent magnet.

[0237] By reasonably setting the structure of the second punching 200, magnetic leakage can be reduced, the torque density of the motor can be improved, torque ripple and cogging torque can be reduced, which is beneficial to improving the use performance and market competitiveness of the product.

[0238] Specifically, the third punching sheet 300 includes a second annular portion 310 and a plurality of mounting structures 320. The inner peripheral wall of the second annular portion 310 encloses a third mounting hole 330. The plurality of mounting structures 320 are arranged at intervals around the third mounting hole 330. Any one of the plurality of mounting structures 320 is connected to the outer peripheral wall of the second annular portion 310. The second annular portion 310 and two adjacent mounting structures 320 enclose a third mounting groove 340. That is to say, the part of the outer peripheral wall of the third punching sheet 300 opposite to the third mounting groove 340 is disconnected to form a notch. The third mounting groove 340 is used for mounting a permanent magnet. The mounting structure 320 forms a third pole portion.

[0239] By reasonably setting the structure of the third punching sheet 300, magnetic leakage can be reduced. The rotor core 1 has a good magnetic concentrating effect, enabling the motor to have a relatively high maximum output torque and a relatively low back electromotive force voltage. Moreover, it is beneficial to improve the power density of the motor. That is, while ensuring the usage requirements of the power density of the motor, the torque density of the motor can be increased, the torque ripple and cogging torque can be reduced, which is beneficial to reducing the volume of the motor and improving the stability and reliability of the motor during use.

[0240] It can be seen from this that by reasonably setting the structure of the rotor core 1, the rotor core 1 includes the first punching sheet 100 and the second punching sheet 200, or the rotor core 1 includes the first punching sheet 100 and the third punching sheet 300, or the rotor core 1 includes the first punching sheet 100, the second punching sheet 200 and the third punching sheet 300. This setting takes into account both the structural strength and magnetic leakage. While ensuring the structural strength of the rotor core 1, it is beneficial to reduce magnetic leakage, can increase the torque density of the motor, can reduce the torque ripple and cogging torque, and is beneficial to improving the usage performance and market competitiveness of the product.

[0241] According to an electric motor of some other embodiments of the present application, it includes: a rotor as in the above embodiments.

[0242] The rotor includes: a rotor core 1 as in any of the above embodiments and a plurality of permanent magnets.

[0243] One permanent magnet is arranged in each slot 50 of the rotor core 1.

[0244] A rotor provided by the present application includes a rotor core 1 and a plurality of permanent magnets.

[0245] The rotor core 1 includes a first iron core structure 10 and a second iron core structure 20.

[0246] The first iron core structure 10 includes a first punching sheet 100, and the second iron core structure 20 is stacked with the first punching sheet 100.

[0247] The second iron core structure 20 includes at least one of the second punching sheet 200 and the third punching sheet 300. That is, the second iron core structure 20 includes the second punching sheet 200, or the second iron core structure 20 includes the third punching sheet 300, or the second iron core structure 20 includes the second punching sheet 200 and the third punching sheet 300. When the second iron core structure 20 includes the second punching sheet 200 and the third punching sheet 300, the first punching sheet 100, the second punching sheet 200, and the third punching sheet 300 are stacked.

[0248] Specifically, the first punching sheet 100 includes a first body 110. The first body 110 is provided with a first mounting hole 120 and a plurality of first mounting grooves 130. The plurality of first mounting grooves 130 are arranged at intervals around the first mounting hole 120. The first mounting grooves 130 are used for mounting permanent magnets. The first mounting grooves 130 are arranged at intervals from the first mounting hole 120, and the first mounting grooves 130 are arranged at intervals from the outer peripheral wall of the first punching sheet 100.

[0249] The portion of the first body 110 between two adjacent first mounting grooves 130 is a first pole portion 160. The portion of the first body 110 between the first mounting hole 120 and the first mounting grooves 130 is a first inner magnetic bridge 140. The portion of the first body 110 between the first mounting grooves 130 and the outer peripheral wall of the first body 110 is a first outer magnetic bridge 150. It can also be said that the first mounting hole 120 and the first mounting grooves 130 are connected by the first inner magnetic bridge 140, and the first mounting grooves 130 and the outer peripheral wall of the first body 110 are connected by the first outer magnetic bridge 150.

[0250] Compared with the related art in which the inner magnetic bridge is removed and the rotor punching sheet is formed by injection molding, the structure of the first punching sheet 100 of the present application can improve the strength of the first iron core structure 10, can reduce the occurrence probability of deformation of the rotor iron core 1, and can ensure the stability and reliability of the motor operation.

[0251] Specifically, the second punching sheet 200 includes a first annular portion 210 and a second body 220. The second body 220 surrounds the first annular portion 210, and the first annular portion 210 and the second body 220 are arranged at intervals. That is, the second body 220 is a ring structure, and the second body 220 is arranged at intervals from the first annular portion 210. That is to say, the second body 220 and the first annular portion 210 are disconnected. It can be understood that the inner peripheral wall of the first annular portion 210 encloses a second mounting hole 230, and the outer peripheral wall of the first annular portion 210 is disconnected from the inner peripheral wall of the second body 220.

[0252] A part of the inner peripheral wall of the second body 220 is recessed towards the outer peripheral wall of the second body 220 to form a plurality of second mounting grooves 240. The number of the second mounting grooves 240 is multiple, and the multiple second mounting grooves 240 are arranged at intervals around the second mounting hole 230. The part of the second body 220 between two adjacent second mounting grooves 240 is the second pole part. The part of the second body 220 between the second mounting groove 240 and the outer peripheral wall of the second body 220 is the second outer magnetic bridge 260. The part of the second punching sheet 200 between the second mounting hole 230 and the second mounting groove 240 is the second inner magnetic bridge 250. In other words, the second mounting groove 240 and the outer peripheral wall of the second body 220 are connected by the second outer magnetic bridge 260. The second mounting groove 240 is used for mounting a permanent magnet.

[0253] By reasonably setting the structure of the second punching sheet 200, magnetic leakage can be reduced, the torque density of the motor can be increased, torque ripple and cogging torque can be reduced, which is beneficial to improving the use performance and market competitiveness of the product.

[0254] Specifically, the third punching sheet 300 includes a second annular portion 310 and a plurality of mounting structures 320. The inner peripheral wall of the second annular portion 310 encloses a third mounting hole 330. The plurality of mounting structures 320 are arranged at intervals around the third mounting hole 330. Any one of the plurality of mounting structures 320 is connected to the outer peripheral wall of the second annular portion 310. The second annular portion 310 and two adjacent mounting structures 320 enclose a third mounting groove 340. That is to say, the part of the outer peripheral wall of the third punching sheet 300 opposite to the third mounting groove 340 is disconnected to form a notch. The third mounting groove 340 is used for mounting a permanent magnet. The mounting structure 320 forms a third pole part.

[0255] By reasonably setting the structure of the third punching sheet 300, magnetic leakage can be reduced, the magnetic flux concentrating effect of the rotor core 1 is good, so that the motor has a higher maximum output torque and a lower back electromotive force voltage. And it is beneficial to improve the power density of the motor, that is, while ensuring the use requirements of the power density of the motor, the torque density of the motor can be increased, torque ripple and cogging torque can be reduced, which is beneficial to reducing the volume of the motor and improving the stability and reliability of the motor in use.

[0256] It can be seen from this that by reasonably setting the structure of the rotor core 1, the rotor core 1 includes the first punching sheet 100 and the second punching sheet 200, or the rotor core 1 includes the first punching sheet 100 and the third punching sheet 300, or the rotor core 1 includes the first punching sheet 100, the second punching sheet 200 and the third punching sheet 300. This setting takes into account both structural strength and magnetic leakage. While ensuring the structural strength of the rotor core 1, it is beneficial to reduce magnetic leakage, increase the torque density of the motor, reduce torque ripple and cogging torque, and improve the use performance and market competitiveness of the product.

[0257] A chassis system according to some further embodiments of the present application includes: a rotor as in the above embodiments; or a motor as in the above embodiments.

[0258] The rotor includes: a rotor core 1 as in any of the above embodiments and a plurality of permanent magnets.

[0259] One permanent magnet is disposed in each slot 50 of the rotor core 1.

[0260] A rotor provided by the present application includes a rotor core 1 and a plurality of permanent magnets.

[0261] The rotor core 1 includes a first core structure 10 and a second core structure 20.

[0262] The first core structure 10 includes a first punching sheet 100, and the second core structure 20 is stacked with the first punching sheet 100.

[0263] The second core structure 20 includes at least one of a second punching sheet 200 and a third punching sheet 300, that is, the second core structure 20 includes the second punching sheet 200, or the second core structure 20 includes the third punching sheet 300, or the second core structure 20 includes the second punching sheet 200 and the third punching sheet 300. When the second core structure 20 includes the second punching sheet 200 and the third punching sheet 300, the first punching sheet 100, the second punching sheet 200, and the third punching sheet 300 are stacked.

[0264] Specifically, the first punching sheet 100 includes a first body 110. The first body 110 is provided with a first mounting hole 120 and a plurality of first mounting grooves 130. The plurality of first mounting grooves 130 are arranged at intervals around the first mounting hole 120. The first mounting grooves 130 are used for mounting permanent magnets. The first mounting grooves 130 are arranged at intervals from the first mounting hole 120, and the first mounting grooves 130 are arranged at intervals from the outer peripheral wall of the first punching sheet 100.

[0265] The part of the first body 110 between two adjacent first mounting grooves 130 is a first pole part 160. The part of the first body 110 between the first mounting hole 120 and the first mounting groove 130 is a first inner magnetic bridge 140. The part of the first body 110 between the first mounting groove 130 and the outer peripheral wall of the first body 110 is a first outer magnetic bridge 150. It can also be said that the first mounting hole 120 and the first mounting groove 130 are connected by the first inner magnetic bridge 140, and the first mounting groove 130 and the outer peripheral wall of the first body 110 are connected by the first outer magnetic bridge 150.

[0266] Compared with the related art in which the inner magnetic bridge is removed and the rotor punching sheet is formed by injection molding, the structure of the first punching sheet 100 of the present application can improve the strength of the first core structure 10, can reduce the occurrence probability of deformation of the rotor core 1, and can ensure the stability and reliability of the motor operation.

[0267] Specifically, the second punching sheet 200 includes a first annular portion 210 and a second body 220. The second body 220 surrounds the first annular portion 210, and the first annular portion 210 and the second body 220 are arranged at intervals. That is to say, the second body 220 is of an annular structure, and the second body 220 and the first annular portion 210 are arranged at intervals. In other words, the second body 220 and the first annular portion 210 are disconnected. It can be understood that the inner peripheral wall of the first annular portion 210 encloses a second mounting hole 230, and the outer peripheral wall of the first annular portion 210 is disconnected from the inner peripheral wall of the second body 220.

[0268] A part of the inner peripheral wall of the second body 220 is recessed toward the outer peripheral wall of the second body 220 to form a second mounting groove 240. The number of the second mounting grooves 240 is multiple, and the multiple second mounting grooves 240 are arranged at intervals around the second mounting hole 230. The part of the second body 220 located between two adjacent second mounting grooves 240 is a second pole portion, and the part of the second body 220 located between the second mounting groove 240 and the outer peripheral wall of the second body 220 is a second outer magnetic bridge 260. The part of the second punching sheet 200 located between the second mounting hole 230 and the second mounting groove 240 is a second inner magnetic bridge 250. It can also be said that the second mounting groove 240 and the outer peripheral wall of the second body 220 are connected by the second outer magnetic bridge 260. The second mounting groove 240 is used for mounting a permanent magnet.

[0269] By reasonably setting the structure of the second punching sheet 200, magnetic leakage can be reduced, the torque density of the motor can be increased, the torque ripple and cogging torque can be reduced, which is beneficial to improving the service performance and market competitiveness of the product.

[0270] Specifically, the third punching sheet 300 includes a second annular portion 310 and a plurality of mounting structures 320. The inner peripheral wall of the second annular portion 310 encloses a third mounting hole 330. The plurality of mounting structures 320 are arranged at intervals around the third mounting hole 330. Any one of the plurality of mounting structures 320 is connected to the outer peripheral wall of the second annular portion 310. The second annular portion 310 and two adjacent mounting structures 320 enclose a third mounting groove 340. That is to say, the part of the outer peripheral wall of the third punching sheet 300 opposite to the third mounting groove 340 is disconnected to form a notch. The third mounting groove 340 is used for mounting a permanent magnet. The mounting structure 320 forms a third pole portion.

[0271] By reasonably setting the structure of the third punching sheet 300, magnetic leakage can be reduced, the magnetic flux concentrating effect of the rotor core 1 is good, enabling the motor to have a relatively high maximum output torque and a relatively low back electromotive force voltage. Moreover, it is beneficial to improve the power density of the motor, that is, while ensuring the usage requirements of the motor's power density, it can increase the torque density of the motor, reduce torque ripple and cogging torque, is conducive to reducing the volume of the motor, and is beneficial to enhancing the stability and reliability of the motor during use.

[0272] It can be seen from this that by reasonably setting the structure of the rotor core 1, the rotor core 1 includes the first punching sheet 100 and the second punching sheet 200, or the rotor core 1 includes the first punching sheet 100 and the third punching sheet 300, or the rotor core 1 includes the first punching sheet 100, the second punching sheet 200, and the third punching sheet 300. This setting takes into account both structural strength and magnetic leakage. While ensuring the structural strength of the rotor core 1, it is beneficial to reduce magnetic leakage, can increase the torque density of the motor, reduce torque ripple and cogging torque, and is conducive to enhancing the usage performance and market competitiveness of the product.

[0273] Optionally, the chassis system includes a drive system, a running system, a steering system (such as, an electric power steering system), and a braking system. The chassis system is used to support and install the assembly of the vehicle engine and its various components, form the overall shape of the vehicle, and receive the power of the engine to make the vehicle move and ensure normal driving.

[0274] A vehicle according to some other embodiments of the present application includes: a rotor as in the above embodiments; or an electric motor as in the above embodiments; or a chassis system as in the above embodiments.

[0275] The rotor core 1 includes at least one of a plurality of second punching sheets 200 and a plurality of third punching sheets 300 and a plurality of first punching sheets 100.

[0276] The first punching sheet 100 is provided with a first mounting hole 120 and a plurality of first mounting grooves 130. The plurality of first mounting grooves 130 are arranged at intervals around the first mounting hole 120. The part of the first punching sheet 100 between two adjacent first mounting grooves 130 is the first pole part 160. The part of the first punching sheet 100 between the first mounting hole 120 and the first mounting groove 130 is the first inner magnetic bridge 140. The part of the first punching sheet 100 between the first mounting groove 130 and the outer peripheral wall of the first punching sheet 100 is the first outer magnetic bridge 150.

[0277] The second punching sheet 200 is provided with a second mounting hole 230 and a plurality of second mounting grooves 240. The plurality of second mounting grooves 240 are arranged at intervals around the second mounting hole 230. The portion of the second punching sheet 200 between two adjacent second mounting grooves 240 is the second pole portion. The portion of the second punching sheet 200 between the second mounting hole 230 and the second mounting grooves 240 is the second inner magnetic bridge 250. The portion of the second punching sheet 200 between the second mounting grooves 240 and the outer peripheral wall of the second punching sheet 200 is the second outer magnetic bridge 260.

[0278] The third punching sheet 300 is provided with a third mounting hole 330 and a plurality of third mounting grooves 340. The plurality of third mounting grooves 340 are arranged at intervals around the third mounting hole 330. The portion of the third punching sheet 300 between two adjacent third mounting grooves 340 is the third pole portion. The portion of the third punching sheet 300 between the third mounting hole 330 and the third mounting grooves 340 is the second isolation groove 350. The portion of the third punching sheet 300 between the third mounting grooves 340 and the outer peripheral wall of the third punching sheet 300 is the opening portion.

[0279] The first inner magnetic bridge 140 includes an annular portion 141, a plurality of first connecting portions 144 and a plurality of first fixing protrusions 143. The second punching sheet 200 includes a first annular portion 210. The third punching sheet 300 includes a second annular portion 310, a plurality of second connecting portions 321 and a plurality of second fixing protrusions 360.

[0280] The height of the first iron core structure 10 in the axial direction of the rotor iron core 1 is denoted as L1. The width of the slot 50 in the circumferential direction of the rotor iron core 1 is denoted as Lm. The depth of the slot 50 in the direction from the shaft hole 40 to the outer peripheral wall of the rotor iron core 1 is denoted as Wm. The axial height of the rotor iron core 1 is denoted as H. The distance from the center of the shaft hole 40 to the outer peripheral wall of the rotor iron core 1 is denoted as R1. Wherein, L1×(Lm + Wm) < π×H×R1.

[0281] Specifically, 0 < (L1×(Lm + Wm)) / (π×H×R1) ≤ 0.6.

[0282] Specifically, 0 < (L1×(Lm + Wm)) / (π×H×R1) ≤ 0.26.

[0283] If the number of the first punching sheets 100 is m1, then L1 is the sum of the axial heights of m1 first punching sheets 100, and m1 ≥ 2.

[0284] The second iron core structure 20 has an axial first end and a second end. At least one first punching sheet 100 is arranged at the first end, and at least one first punching sheet 100 is arranged at the second end.

[0285] The number of the first fixing protrusions 143 is n1, and the number of the second fixing protrusions 360 is n2. n1 + n2 ≥ p, where p is the number of pole pairs of the motor.

[0286] The number of the first connecting parts 144 is k1, where k1 = 2×p and p is the number of pole pairs of the motor.

[0287] The number of the second connecting parts 321 is k2, where k2 = 2×p and p is the number of pole pairs of the motor.

[0288] When projected along the axial direction of the rotor core 1, the contour line of the second punching sheet 200 or the third punching sheet 300 does not exceed the contour line of the first punching sheet 100.

[0289] At least one of the first fixing protrusion 143 and the second fixing protrusion 360 is correspondingly arranged for each slot 50.

[0290] At least one of the second punching sheet 200 and the third punching sheet 300 is connected to the first punching sheet 100 by at least one of riveting, welding, and gluing.

[0291] The first isolation groove 170 is filled with air or non-magnetic material.

[0292] (L1×(Lm + Wm)) / (π×H×R1)=X. Figure 9 and Figure 10 shows the trends of the cogging torque, output torque, and torque ripple of the motor changing with the change of X.

[0293] Taking a 12-slot 10-pole permanent magnet motor as an example, the number of pole pairs p = 5. Figure 9 and Figure 10 shows the simulation results of the cogging torque, output torque, and torque ripple under different X values. Among them, Tcog*, Te*, and Tr* are per-unit values. Tcog* is the ratio of the cogging torque under different X values to the cogging torque of the motor in the related technology. Te* is the ratio of the output torque under different X values to the output torque of the motor in the related technology. Tr* is the ratio of the torque ripple under different X values to the torque ripple of the motor in the related technology. When X is greater than 0 and less than or equal to 0.6, while ensuring sufficient motor output torque Te*, the torque ripple Tr* < 1.15 and the cogging torque Tcog* < 1.3. When X is greater than 0 and less than or equal to 0.26, while ensuring sufficient motor output torque Te*, the torque ripple Tr* < 1.05 and the cogging torque Tcog* < 1.1, and the cost performance is better.

[0294] In this application, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "coupled" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0295] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. The above is only the preferred embodiment of this application and is not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A rotor core, characterized in that, Comprising: A first iron core structure, the first iron core structure includes a first punching sheet, the first punching sheet includes a first body, the first body is provided with a first mounting hole and a plurality of first mounting grooves, the plurality of first mounting grooves are arranged at intervals around the first mounting hole, a portion of the first body between the first mounting hole and the first mounting grooves includes a first inner magnetic bridge and a first isolation groove, and a portion of the first body between the first mounting grooves and the outer peripheral wall of the first body is a first outer magnetic bridge; A second iron core structure, the second iron core structure is stacked with the first punching sheet, and the second iron core structure includes at least one of a second punching sheet and a third punching sheet; The second punching sheet includes a first annular portion and a second body, the second body surrounds the first annular portion, the first annular portion and the second body are arranged at intervals, an inner peripheral wall of the first annular portion encloses a second mounting hole, the second body is provided with a plurality of second mounting grooves, the plurality of second mounting grooves are arranged at intervals around the second mounting hole, the second mounting grooves extend from the inner peripheral wall of the second body to the outer peripheral wall of the second body, a portion of the second punching sheet between the second mounting hole and the second mounting grooves is a second inner magnetic bridge, and a portion of the second body between the second mounting grooves and the outer peripheral wall of the second body is a second outer magnetic bridge; The third punching sheet includes a second annular portion and a plurality of mounting structures, an inner peripheral wall of the second annular portion encloses a third mounting hole, the plurality of mounting structures are arranged at intervals around the third mounting hole, the mounting structures are connected to the outer peripheral wall of the second annular portion, the second annular portion and two adjacent mounting structures enclose a third mounting groove, and a portion of the third punching sheet between the third mounting hole and the third mounting groove is a second isolation groove.

2. The rotor core according to claim 1, wherein At least one of the second mounting hole and the third mounting hole communicates axially with the first mounting hole along the rotor core to form an axial hole, and at least one of the second mounting grooves and the third mounting grooves communicates axially with the first mounting grooves along the rotor core to form a slot; A height of the first iron core structure in the axial direction of the rotor core is denoted as L1, a width of the slot in the circumferential direction of the rotor core is denoted as Lm, a depth of the slot in the direction from the axial hole to the outer peripheral wall of the rotor core is denoted as Wm, an axial height of the rotor core is denoted as H, and a distance from the center of the axial hole to the outer peripheral wall of the rotor core is denoted as R1; Wherein, L1×(Lm + Wm) < π×H×R1.

3. The rotor core according to claim 2, characterized in that, L1, Lm, Wm, H, and R1 satisfy: 0 < (L1×(Lm + Wm)) / (π×H×R1) ≤ 0.

6.

4. The rotor core according to claim 3, characterized in that L1, Lm, Wm, H, and R1 satisfy: 0 < (L1×(Lm + Wm)) / (π×H×R1) ≤ 0.

26.

5. The rotor core according to any one of claims 1 to 4, characterized in that, The first iron core structure includes a plurality of the first punching sheets; Along the axial direction of the rotor core, the plurality of first punching sheets are stacked on the same side of the second iron core structure.

6. The rotor core according to any one of claims 1 to 4, characterized in that, The first iron core structure includes a plurality of the first punching sheets; Axially along the rotor core, a part of the first punching sheets among the multiple first punching sheets is stacked on one side of the second iron core structure, and another part of the first punching sheets among the multiple first punching sheets is stacked on the other side of the second iron core structure.

7. The rotor core according to any one of claims 1 to 4, characterized in that The part of the first body located between two adjacent first mounting grooves is the first pole part, and the first inner magnetic bridge includes: A ring part, the inner peripheral wall of the ring part encloses the first mounting hole, and the outer peripheral wall of the ring part is spaced from the first pole part to enclose the first isolation groove, and the first mounting groove communicates with the first isolation groove; A plurality of first fixing protrusions, the first fixing protrusions are connected to the outer peripheral wall of the ring part, and the first fixing protrusions are disposed opposite to one of the first mounting grooves; A plurality of first connecting parts, the first connecting parts are connected between the outer peripheral wall of the ring part and the first pole part, and the plurality of first connecting parts and the plurality of first fixing protrusions are arranged staggeredly; When the second iron core structure includes the third punching sheet, the mounting structure includes: A second connecting part; A magnetic pole part, along from the third mounting hole to the outer peripheral wall of the third punching sheet, the second connecting part is connected between the second annular part and the magnetic pole part; A first limiting section; A second limiting section, circumferentially along the rotor core, the magnetic pole part is connected between the first limiting section and the second limiting section, and either the first limiting section or the second limiting section is arranged away from the second annular part; A plurality of second fixing protrusions are provided on the outer peripheral wall of the second annular part, and the second fixing protrusions are disposed opposite to one of the third mounting grooves.

8. The rotor core according to claim 7, wherein, The number of the first fixing protrusions is denoted as n1, and the number of the second fixing protrusions is denoted as n2, wherein n1 + n2 ≥ p, and p is the number of pole pairs of the motor.

9. The rotor core according to claim 7, characterized in that, The number of the first connecting parts is denoted as k1, wherein k1 = 2×p, and p is the number of pole pairs of the motor.

10. The rotor core according to claim 7, characterized in that, The number of the second connecting parts is denoted as k2, wherein k2 = 2×p, and p is the number of pole pairs of the motor.

11. The rotor core according to claim 7, characterized in that, Any one of the first fixing protrusion and the second fixing protrusion includes at least one of a strip segment and an arc segment; and / or Any one of the first connecting part and the second connecting part includes at least one of a strip segment and an arc segment.

12. The rotor core according to any one of claims 1 to 4, characterized in that, When the second iron core structure includes the second punching sheet, the distance from the center of the first mounting hole to the outer peripheral wall of the first punching sheet is greater than or equal to the distance from the center of the second mounting hole to the outer peripheral wall of the second punching sheet; When the second iron core structure includes the third punching sheet, the distance from the center of the first mounting hole to the outer peripheral wall of the first punching sheet is greater than or equal to the distance from the center of the third mounting hole to the outer peripheral wall of the third punching sheet.

13. A rotor, characterized in that, Including: The rotor core according to any one of claims 1 to 12; A plurality of permanent magnets, and one permanent magnet is disposed in any one of the plurality of slots of the rotor core.

14. A motor, characterized in that, Including: The rotor according to claim 13.

15. A chassis system, characterized in that, Including: The rotor according to claim 13; Or The motor according to claim 14.

16. A vehicle, characterized in that, Including: The rotor according to claim 13; Or The motor according to claim 14; Or The chassis system according to claim 15.

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