Rotor punching sheet, rotor, motor, chassis system and vehicle

Abstract

The invention provides a rotor punching sheet, a rotor, a motor, a chassis system and a vehicle. The rotor punching sheet comprises a punching sheet body, and an inner magnetic bridge of the punching sheet body comprises an annular part, a plurality of fixed bulges and a plurality of connecting parts. The annular part is arranged around the mounting hole, the peripheral wall of the annular part and the pole part are arranged at intervals to define an isolation groove, and the mounting groove is communicated with the isolation groove; the multiple fixing protrusions are connected to the peripheral wall of the annular part, and each mounting groove is arranged opposite to at least one fixing protrusion; each connecting part is connected between the peripheral wall of the annular part and the pole part, and the connecting parts and the fixing protrusions are arranged in a staggered mode; the distance from the inner peripheral wall to the outer peripheral wall of the annular part is recorded as H1, the distance from the center of the mounting hole to the inner peripheral wall of the annular part is recorded as R0, the distance from the center of the mounting hole to the outer peripheral wall of the punching sheet body is recorded as R1, and H1 * (H1 + 2 * R0) < R12-R02.

Description

Technical Field

[0001] The present application relates to the field of motors, and in particular, to a rotor punching sheet, a rotor, a motor, a chassis system and a vehicle. Background Art

[0002] In the related art, the permanent magnet motor removes the inner magnetic bridge and uses injection molding to form the rotor core to solve the torque pulsation problem. This arrangement increases the manufacturing cost, reduces the strength of the rotor core, and reduces the performance of the product. Summary of the invention

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

[0004] To this end, a first aspect of the present application proposes a rotor punching sheet.

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

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

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

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

[0009] In view of this, the first aspect of the present application proposes a rotor punching sheet for use in a motor, wherein the rotor punching sheet comprises: a punching sheet body, wherein the punching sheet body is provided with a mounting hole and a plurality of mounting grooves, wherein the plurality of mounting grooves are arranged at intervals around the mounting hole, wherein the portion of the punching sheet body located between two adjacent mounting grooves is a pole portion, wherein the portion of the punching sheet body located between the mounting hole and the mounting groove is an inner magnetic bridge, and wherein the portion of the punching sheet body located between the mounting groove and the outer peripheral wall of the punching sheet body is an outer magnetic bridge; wherein the inner magnetic bridge comprises: an annular portion, wherein the annular portion is arranged around the mounting hole, wherein the outer peripheral wall of the annular portion is arranged at intervals with the pole portion to enclose an isolation groove, wherein the mounting groove is connected with the isolation groove; wherein the plurality of fixing protrusions are all connected to the outer peripheral wall of the annular portion, wherein each mounting groove is arranged opposite to at least one fixing protrusion; wherein the plurality of connecting portions are each connected between the outer peripheral wall of the annular portion and the pole portion, wherein the plurality of connecting portions and the plurality of fixing protrusions are arranged in a staggered manner; wherein the distance from the inner peripheral wall to the outer peripheral wall of the annular portion is denoted as H 1 The distance from the center of the mounting hole to the inner wall of the annular portion is denoted as R 0 The distance from the center of the mounting hole to the outer wall of the punch body is recorded as R 1 , where H 1 ×(H 1 +2×R 0 )<R 1 2 -R 0 2 .

[0010] A rotor punching sheet provided by the present application includes a punching sheet body.

[0011] The punching sheet body is provided with a mounting hole and a plurality of mounting grooves, and the plurality of mounting grooves are arranged at intervals around the mounting hole. The mounting grooves are used for mounting permanent magnets. The mounting grooves are arranged at intervals with the mounting hole, and the mounting grooves are arranged at intervals with the outer peripheral wall of the punching sheet body.

[0012] The part of the punching sheet body between two adjacent mounting grooves is a pole part, the part of the punching sheet body between the mounting hole and the mounting grooves is an inner magnetic bridge, and the part of the punching sheet body between the mounting grooves and the outer peripheral wall of the punching sheet body is an outer magnetic bridge.

[0013] The inner magnetic bridge includes an annular part, a plurality of fixing protrusions and a plurality of connecting parts.

[0014] Among them, the annular part has an inner peripheral wall and an outer peripheral wall. The inner peripheral wall of the annular part encloses the mounting hole. The mounting holes of a plurality of rotor punching sheets penetrate along the axial direction of the rotor to form a shaft hole, and the rotating shaft of the motor is inserted into the shaft hole.

[0015] The plurality of fixing protrusions are all connected to the outer peripheral wall of the annular part. Any one of the plurality of fixing protrusions is connected to the outer peripheral wall of the annular part, and each mounting groove is arranged opposite to at least one fixing protrusion. That is to say, each mounting groove cooperates with at least one fixing protrusion. The fixing protrusion has the function of supporting and fixing the permanent magnet in the mounting groove. In this way, the matching dimensions of the permanent magnet punching sheet body and the rotating shaft can be guaranteed, providing a reliable structural support for the effectiveness and feasibility of the motor operation.

[0016] Any one of the plurality of connecting parts is connected between the outer peripheral wall of the annular part and the pole part. That is, the first end of the connecting part is connected to the outer peripheral wall of the annular part, and the second end of the connecting part is connected to the pole part. It can also be said that the annular part and the pole part are assembled together through a plurality of connecting parts, which can guarantee the matching dimensions of the rotating shaft, the punching sheet body and the permanent magnet.

[0017] Compared with the related art in which the inner magnetic bridge is removed and the rotor punching sheet is formed by injection molding, this setting can improve the structural strength of the rotor punching sheet, reduce the occurrence probability of deformation of the rotor punching sheet, and ensure the stability and reliability of the motor operation.

[0018] Optionally, the punching sheet body is integrally formed with an inner magnetic bridge. This structural setting simplifies the forming process of the punching sheet body because the assembly process of the inner magnetic bridge is omitted, which is beneficial to improving the processing efficiency of the product. And the structural strength of the rotor punching sheet can be guaranteed.

[0019] Among them, the structure of the inner magnetic bridge is further defined such that the distance from the inner peripheral wall to the outer peripheral wall of the annular part is H 1 , and the distance from the center of the mounting hole to the inner peripheral wall of the annular part is R 0, the distance from the center of the mounting hole to the outer peripheral wall of the punching sheet body is R 1 , H 1 ×(H 1 +2×R 0 ) < R 1 2 -R 0 2 . That is to say, the structure of the inner magnetic bridge is optimized (for example, while ensuring the structural strength of the rotor punching sheet, the area of the inner magnetic bridge can be reduced). On the basis of ensuring the effective assembly of the rotating shaft and the permanent magnet, the structural strength of the rotor punching sheet can also be ensured, and the probability of deformation of the rotor punching sheet can be reduced. Compared with the formation of the rotor core by injection molding in the related art, the matching dimensions of the rotor punching sheet, the permanent magnet and the rotating shaft can be ensured, and the production cost of the product can be reduced. In addition, the structural setting optimizes the structure of the inner magnetic bridge. In this way, it can play a role in reasonably arranging the magnetic force lines, which is beneficial to reducing magnetic leakage, achieving the effect of improving the torque density and suppressing torque ripple. That is to say, this setting takes into account the production cost, structural strength and service performance of the product, which is beneficial to enhancing the market competitiveness of the product.

[0020] Optionally, the fixing protrusion extends from the outer peripheral wall of the annular portion towards the mounting groove.

[0021] Optionally, the fixing protrusion is located between the outer peripheral wall of the annular portion and the mounting groove.

[0022] Optionally, a part of the fixing protrusion extends into the mounting groove.

[0023] It can be understood that the mounting groove communicates with the isolation groove. For example, the notch of the mounting groove communicates with the isolation groove, and both the fixing protrusion and the connecting portion are located at the isolation groove. In this way, it can ensure that the fixing protrusion has the function of fixing the permanent magnet, and can also meet the use requirement that the connecting portion is connected between the annular portion and the pole portion.

[0024] It can be understood that the plurality of connecting portions and the plurality of fixing protrusions are arranged staggeredly. For example, the plurality of connecting portions are arranged at intervals around the mounting hole, the plurality of fixing protrusions are arranged at intervals around the mounting hole, and at least one fixing protrusion is arranged between any two adjacent connecting portions.

[0025] According to the rotor punching sheet of the present application described above, it may also have the following additional technical features:

[0026] In some embodiments, optionally, H 1 , R 0 and R 1 satisfy: 0 < (H 1 ×(H 1 +2×R 0 )) / (R 1 2 -R 02 ) ≤ 0.5.

[0027] In this embodiment, the structure of the inner magnetic bridge is further defined, such that H 1 , R 0 and R 1 satisfy the relationship: 0 < (H 1 × (H 1 + 2 × R 0 )) / (R 1 2 - R 0 2 ) ≤ 0.5. In this way, the structure of the inner magnetic bridge is further optimized, and thus the production cost, structural strength, and service performance of the product are further optimized, which is beneficial to enhancing the market competitiveness of the product.

[0028] Optionally, (H 1 × (H 1 + 2 × R 0 )) / (R 1 2 - R 0 2 ) = 0.45, (H 1 × (H 1 + 2 × R 0 )) / (R 1 2 - R 0 2 ) = 0.4, (H 1 × (H 1 + 2 × R 0 )) / (R 1 2 - R 0 2 ) = 0.35, (H 1 × (H 1 + 2 × R 0 )) / (R 1 2 - R 0 2 ) = 0.3, (H 1 × (H 1 + 2 × R 0 )) / (R 1 2 - R 0 2 ) = 0.25, etc., which are not listed one by one here.

[0029] In some embodiments, optionally, H 1 , R 0 and R 1 satisfy: 0 < (H 1 × (H1 +2×R 0 )) / (R 1 2 -R 0 2 ) ≤ 0.33。

[0030] In this embodiment, the structure of the inner magnetic bridge is further defined, such that H 1 , R 0 and R 1 satisfy the relationship: 0 < (H 1 × (H 1 + 2×R 0 )) / (R 1 2 -R 0 2 ) ≤ 0.33. In this way, the structure of the inner magnetic bridge is further optimized, and further, the production cost, structural strength and service performance of the product are optimized, which is beneficial to enhancing the market competitiveness of the product.

[0031] In some embodiments, optionally, H 1 , R 0 and R 1 satisfy: 0 < H 1 / (R 1 -R 0 ) ≤ 0.45.

[0032] In this embodiment, the structure of the inner magnetic bridge is further defined, such that H 1 , R 0 and R 1 satisfy the relationship: 0 < H 1 / (R 1 -R 0 ) ≤ 0.45. That is, the relationship between the distance from the inner peripheral wall to the outer peripheral wall of the annular portion, the distance from the center of the mounting hole to the inner peripheral wall of the annular portion, and the distance from the center of the mounting hole to the outer peripheral wall of the punching sheet body is defined.

[0033] When the above limitations are met, it has the effects of reducing magnetic leakage, increasing torque density, and suppressing torque ripple.

[0034] If H 1 / (R 1 -R 0 ) is greater than 0.45, then the size setting of the annular portion is unreasonable. In this way, magnetic leakage will increase, torque density will decrease, and torque ripple will increase.

[0035] Optionally, H 1 / (R 1 -R 0 ) = 0.42, H 1 / (R1 -R 0 ) = 0.4, H 1 / (R 1 -R 0 ) = 0.36, H 1 / (R 1 -R 0 ) = 0.35, H 1 / (R 1 -R 0 ) = 0.3, H 1 / (R 1 -R 0 ) = 0.28, etc., which are not listed one by one here.

[0036] In some embodiments, optionally, the thickness of the punching sheet body is denoted as d, where H 1 ≥d.

[0037] In this embodiment, the structure of the punching sheet body is further defined such that the thickness of the punching sheet body is d, where H 1 and the relationship between d satisfies: H 1 ≥d.

[0038] This setting can ensure the structural strength of the rotor punching sheet, avoid deformation of the rotor punching sheet, and provide effective and reliable structural support for ensuring the matching dimensions of the rotor punching sheet, permanent magnet, and rotating shaft.

[0039] If H 1 is less than d, then the structural strength of the product is low, the rotor punching sheet is prone to deformation, and the structural strength of the rotor punching sheet will be reduced.

[0040] Optionally, H 1 = 1.2×d, H 1 = 1.5×d, H 1 = 1.8×d, and H 1 = 2×d, etc., which are not listed one by one here.

[0041] In some embodiments, optionally, the width of the fixing protrusion in the circumferential direction of the rotor punching sheet is denoted as w 1 , the length of the fixing protrusion in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is denoted as b 1 , the number of the fixing protrusions is denoted as m 1 , the width of the connecting portion in the circumferential direction of the rotor punching sheet is denoted as w 2 , the length of the connecting portion in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is denoted as b 2 , the number of the connecting portions is denoted as m 2 , the depth of the mounting groove in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is denoted as W m , the distance from the center of the mounting hole to the outer peripheral wall of the annular portion is denoted as R2 ; where w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 <π×((R 1 -W m ) 2 -R 2 2 ).

[0042] In this embodiment, the mating structure of the fixing protrusion, the connecting portion, the mounting hole, and the mounting groove is defined. Among them, the width of the fixing protrusion in the circumferential direction of the rotor punching is w 1 , the length of the fixing protrusion in the direction from the mounting hole to the outer peripheral wall of the punching body is b 1 , the number of the fixing protrusions is m 1 , the width of the connecting portion in the circumferential direction of the rotor punching is w 2 , the length of the connecting portion in the direction from the mounting hole to the outer peripheral wall of the punching body is b 2 , the number of the connecting portions is m 2 , the distance from the center of the mounting hole to the outer peripheral wall of the punching body is R 1 , the depth of the mounting groove in the direction from the mounting hole to the outer peripheral wall of the punching body is W m , the distance from the center of the mounting hole to the outer peripheral wall of the annular portion is R 2 . w 1 , b 1 , m 1 , w 2 , b 2 , m 2 , R 1 , W m and R 2 satisfy w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 <π×((R 1 -W m ) 2 -R 2 2) That is to say, the structure of the inner magnetic bridge is optimized (for example, while ensuring the structural strength of the rotor punching sheet, the area of the inner magnetic bridge can be reduced). On the basis of ensuring the effective assembly of the rotating shaft and the permanent magnet, the structural strength of the rotor punching sheet can also be ensured, and the probability of deformation of the rotor punching sheet can be reduced. Compared with the method of forming the rotor iron core by injection molding in the related art, the mating dimensions of the rotor punching sheet, the permanent magnet and the rotating shaft can be ensured, and the production cost of the product can be reduced. In addition, the structural setting optimizes the structure of the inner magnetic bridge. More specifically, the mating dimensions of the inner magnetic bridge and the permanent magnet are optimized. In this way, the magnetic force lines can be reasonably arranged, which is beneficial to reducing magnetic leakage, improving the torque density and suppressing torque ripple. That is to say, this setting takes into account the production cost, structural strength and service performance of the product, which is beneficial to enhancing the market competitiveness of the product.

[0043] Optionally, w 1 , b 1 , m 1 , w 2 , b 2 , m 2 , R 1 , W m and R 2 satisfy: 0 < (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m ) 2 - R 2 2 )) ≤ 0.5.

[0044] Optionally, w 1 , b 1 , m 1 , w 2 , b 2 , m 2 , R 1 , W m and R 2 satisfy: 0 < (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m ) 2 - R 2 2 )) ≤ 0.3.

[0045] It can be understood that the lamination body is sectioned along the axis perpendicular to the rotor lamination. In the section, the contour line of the fixed convex portion 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 lamination. The point on the first line segment is denoted as the first point, and along the circumferential direction of the rotor lamination, the point on the second line segment that is oppositely arranged with respect to the first point is denoted as the second point, and the distance from the first point to the second point is denoted as w 1 . w 2 is determined in the same way as w 1 , which will not be elaborated here.

[0046] It can be understood that the lamination body is sectioned along the axis perpendicular to the rotor lamination. In the section, the contour line of the fixed convex portion includes a third line segment and a fourth line segment, and the third line segment and the fourth line segment are arranged at intervals along the direction from the mounting hole to the outer peripheral wall of the lamination body. The point on the third line segment is denoted as the third point, and along the direction from the mounting hole to the outer peripheral wall of the lamination body, the point on the fourth line segment that is oppositely arranged with respect to the third point is denoted as the fourth point, and the distance from the third point to the fourth point is denoted as b 1 . b 2 is determined in the same way as b 1 , which will not be elaborated here.

[0047] It can be understood that the lamination body is sectioned along the axis perpendicular to the rotor lamination. In the section, the point on the contour line of the bottom of the mounting groove is denoted as the fifth point, and along the direction from the mounting hole to the outer peripheral wall of the lamination body, the distance from the fifth point to the notch of the mounting groove is denoted as W m .

[0048] In some embodiments, optionally, the distance from the part of the outer peripheral wall of the lamination body that is oppositely arranged with respect to the pole portion to the center of the mounting hole is denoted as R 11 , the distance from the part of the outer peripheral wall of the lamination body that is oppositely arranged with respect to the mounting groove to the center of the mounting hole is denoted as R 22 , the distance from the center of the mounting hole to the pole portion is denoted as R 3 , the width of the mounting groove in the circumferential direction of the lamination body is denoted as L m , the distance from the mounting groove to the outer edge of the lamination body is denoted as h, and the number of pole pairs of the motor is denoted as p, where 4 × p × L m × h < π × (R 11 + R 22 + 2 × R 3 ) × W m .

[0049] In some embodiments, optionally, the mating structure of the lamination body is further defined such that the distance from the part of the outer peripheral wall of the lamination body that is oppositely arranged with respect to the pole portion to the center of the mounting hole is R 11 , the distance from the part of the outer peripheral wall of the lamination body that is oppositely arranged with respect to the mounting groove to the center of the mounting hole is R 22 , and the distance from the center of the mounting hole to the pole portion is R3 , the width of the installation groove in the circumferential direction of the punching sheet body is L m , the distance from the installation groove to the outer edge of the punching sheet body is h, and the number of pole pairs of the motor is P. Among them, p, L m , h, R 11 , R 22 , R 3 and W m satisfy the relationship: 4×p×L m ×h < π×(R 11 + R 22 + 2×R 3 )×W m . That is, the structure of the inner magnetic bridge is optimized (such as, the structure of the outer magnetic bridge is optimized). On the basis of ensuring the effective assembly of the rotating shaft and the permanent magnet, the structural strength of the rotor punching sheet can also be ensured, and the probability of deformation of the rotor punching sheet can be reduced. Compared with the formation of the rotor iron core by injection molding in the related technology, the matching dimensions of the rotor punching sheet, the permanent magnet and the rotating shaft can be ensured, and the production cost of the product can also be reduced. In addition, the structural setting optimizes the structure of the outer magnetic bridge. In this way, it can play a role in reasonably arranging the magnetic field lines, which is beneficial to reducing magnetic leakage, achieving the effect of improving the torque density and suppressing torque ripple. That is to say, this setting takes into account the production cost, structural strength and service performance of the product, which is beneficial to enhancing the market competitiveness of the product.

[0050] Optionally, R 1 , R 2 , R 3 , L m , h and p satisfy: 0 < (4×p×L m ×h) / (π×(R 1 + R 2 + 2×R 3 )×W m ) < 0.2.

[0051] Optionally, R 1 , R 2 , R 3 , L m , h and p satisfy: 0 < (4×p×L m ×h) / (π×(R 1 + R 2 + 2×R 3 )×W m ) < 0.08.

[0052] It can be understood that the laminating core body is sectioned along the axial direction perpendicular to the rotor laminations. In the section, the contour lines of the two side walls of the mounting groove are respectively denoted as the fifth line segment and the sixth line segment. The point on the fifth line segment is denoted as the fifth point. Along the circumferential direction of the rotor laminations, the point on the sixth line segment that is opposite to the fifth point is denoted as the sixth point. The distance from the fifth point to the sixth point is denoted as L. m .

[0053] It can be understood that the laminating core body is sectioned along the axial direction perpendicular to the rotor laminations. In the section, the point on the contour line of the bottom wall of the mounting groove is denoted as the seventh point. Along the center of the mounting hole to the outer peripheral wall of the laminating core body, the point on the contour line of the outer peripheral wall of the laminating core body that is opposite to the seventh point is denoted as the eighth point. The distance from the seventh point to the eighth point is denoted as h.

[0054] In some embodiments, optionally, m 1 and p satisfy: m 1 = 2×p; m 2 and p satisfy: m 2 = p, or m 2 = 2×p.

[0055] In this embodiment, the relationship between m 1 , m 2 and p is further defined. So that m 1 and p satisfy: m 1 = 2×p; m 2 and p satisfy: m 2 = p, or m 2 = 2×p. The number of pole pairs of the motor is denoted as p.

[0056] Among them, m 1 = 2×p. In this way, each fixing protrusion is matched with a mounting groove. More specifically, each fixing protrusion is used to limit a permanent magnet.

[0057] Among them, m 2 = p, or m 2 = 2×p, that is, the relationship between the number of connecting parts and the number of pole pairs of the motor is defined.

[0058] Optionally, at least one fixing protrusion is arranged between two adjacent connecting parts.

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

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

[0061] Among them, the fixing protrusions include strip segments and / or arc segments. For example, the fixing protrusions include strip segments, or the fixing protrusions include arc segments, or the fixing protrusions include strip segments and arc segments.

[0062] And / or the connecting part includes at least one of a strip segment and an arc segment. For example, the connecting part includes a strip segment, or the connecting part includes an arc segment, or the connecting part includes a strip segment and an arc segment.

[0063] In some embodiments, optionally, at least two fixing protrusions are provided between any two adjacent connecting parts.

[0064] In this embodiment, the matching structure of multiple connecting parts and multiple fixing protrusions is defined such that at least two fixing protrusions are provided between any two adjacent connecting parts. For example, three fixing protrusions are provided between any two adjacent connecting parts, or four fixing protrusions are provided between any two adjacent connecting parts, etc., which are not listed one by one here.

[0065] This setting can not only ensure the structural strength of the rotor punching sheet, but also reduce the number of connecting parts, which is beneficial to reducing the cost of the rotor punching sheet.

[0066] A second aspect of the present invention provides a rotor, including: a rotor core, the rotor core is formed by stacking a plurality of rotor punching sheets as in any one of the embodiments in the first aspect, and the installation grooves of the plurality of rotor punching sheets penetrate along the axial direction of the rotor core to form slots; a plurality of permanent magnets, and one permanent magnet is arranged in each slot.

[0067] The rotor provided by the present invention includes a rotor core and a plurality of permanent magnets. Since the rotor core is formed by stacking a plurality of rotor punching sheets as in any one of the embodiments in the first aspect, it has all the beneficial effects of the above-mentioned rotor punching sheet, which will not be elaborated one by one here.

[0068] In some embodiments, optionally, in the rotor punching sheet, the part of the isolation groove located between two adjacent connecting parts is a sub-groove; the plurality of rotor punching sheets include a first rotor punching sheet and a second rotor punching sheet, the sub-groove of the first rotor punching sheet is arranged opposite to the connecting part of the second rotor punching sheet, and the connecting part of the first rotor punching sheet is arranged opposite to the sub-groove of the second rotor punching sheet.

[0069] In this embodiment, in the rotor punching sheet, the part of the isolation groove located between two adjacent connecting parts is a sub-groove.

[0070] And the types of the plurality of rotor punching sheets are classified. The plurality of rotor punching sheets include a first rotor punching sheet and a second rotor punching sheet. Among them, the sub-groove of the first rotor punching sheet is arranged opposite to the connecting part of the second rotor punching sheet, and the connecting part of the first rotor punching sheet is arranged opposite to the sub-groove of the second rotor punching sheet. This setting is beneficial to eliminating magnetic leakage at the shaft end and making the overall magnetic field line distribution more uniform.

[0071] In some embodiments, optionally, the number of the first rotor laminations and the second rotor laminations is multiple; at least one second rotor lamination is stacked between two adjacent first rotor laminations, or at least one first rotor lamination is stacked between two adjacent second rotor laminations.

[0072] In this embodiment, that is, the mating structure of the multiple first rotor laminations and the multiple second rotor laminations is defined.

[0073] It can be understood that by rotating at least one of the multiple rotor laminations, the multiple rotor laminations are divided into multiple first rotor laminations and multiple second rotor laminations according to the placement positions, so as to meet the usage requirement that the connecting portion of the first rotor lamination and the sub-slot of the second rotor lamination are oppositely arranged.

[0074] Optionally, at least one second rotor lamination is stacked between two adjacent first rotor laminations.

[0075] Optionally, at least one first rotor lamination is stacked between two adjacent second rotor laminations.

[0076] In some other embodiments, the number of the first rotor lamination and the second rotor lamination is one each.

[0077] A third aspect of the present invention provides a motor, including: a rotor as in the second aspect.

[0078] Since the motor provided by the present invention includes a rotor as in the second aspect, it has all the beneficial effects of the above-mentioned rotor, and will not be elaborated one by one here.

[0079] A fourth aspect of the present invention provides a chassis system, including: a rotor as in the second aspect; or a motor as in the third aspect.

[0080] Since the chassis system provided by the present invention includes a rotor as in the second aspect, or a motor as in the third aspect, it has all the beneficial effects of the above-mentioned rotor or motor, and will not be elaborated one by one here.

[0081] A fifth aspect of the present invention provides a vehicle, including: a rotor as in the second aspect; or a motor as in the third aspect; or a chassis system as in the fourth aspect.

[0082] Since 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, it has all the beneficial effects of one of the above-mentioned rotor, motor and chassis system, and will not be elaborated one by one here.

[0083] 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 electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0084] 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

[0085] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0086] Figure 1 The structural schematic diagram of the rotor punching sheet of an embodiment of the present application is shown;

[0087] Figure 2 The dimension marking schematic diagram of the rotor punching sheet of an embodiment of the present application is shown;

[0088] Figure 3 The partial structural schematic diagram of the rotor core of an embodiment of the present application is shown;

[0089] Figure 4 The data curve diagram showing the variation of the output torque and product cost of the motor of the present application with the change of X1 is shown;

[0090] Figure 5 The data curve diagram showing the variation of the output torque and product cost of the motor of the present application with the change of X2 is shown.

[0091] Wherein, Figures 1 to 3 The corresponding relationship between the reference numerals in the drawings and the component names is as follows:

[0092] 1 Rotor punching sheet, 1a First rotor punching sheet, 1b Second rotor punching sheet, 10 Punching sheet body, 100 Mounting hole, 200 Mounting groove, 300 Pole part, 400 Inner magnetic bridge, 410 Ring part, 412 Outer peripheral wall of the ring part, 414 Inner peripheral wall of the ring part, 420 Fixed protrusion, 430 Connecting part, 500 Outer magnetic bridge, 600 Isolation groove, 610 Sub-groove, 700 Outer peripheral wall of the punching sheet body, 8 Rotor, 800 Rotor core, 810 Slot, 900 Permanent magnet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[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 in conjunction with the drawings and specific embodiments. 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] In the following description, numerous specific details are set forth to provide a thorough understanding of the present application. However, the present application may be practiced in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0095] Reference is made below Figures 1 to 5 A rotor punching sheet 1, a rotor 8, an electric motor, a chassis system, and a vehicle according to some embodiments of the present application.

[0096] As Figure 1 shown, a rotor punching sheet 1 according to some embodiments of the present application is for an electric motor, and the rotor punching sheet 1 includes a punching sheet body 10.

[0097] The punching sheet body 10 is provided with a mounting hole 100 and a plurality of mounting grooves 200.

[0098] The plurality of mounting grooves 200 are arranged at intervals around the mounting hole 100.

[0099] The portion of the punching sheet body 10 between two adjacent mounting grooves 200 is a pole portion 300.

[0100] The portion of the punching sheet body 10 between the mounting hole 100 and the mounting groove 200 is an inner magnetic bridge 400.

[0101] The portion of the punching sheet body 10 between the mounting groove 200 and the outer peripheral wall 700 of the punching sheet body is an outer magnetic bridge 500.

[0102] The inner magnetic bridge 400 includes an annular portion 410, a plurality of fixing protrusions 420, and a plurality of connecting portions 430.

[0103] The annular portion 410 is arranged around the mounting hole 100.

[0104] The outer peripheral wall 412 of the annular portion is arranged at intervals from the pole portion 300 to enclose an isolation groove 600.

[0105] The mounting groove 200 communicates with the isolation groove 600.

[0106] The plurality of fixing protrusions 420 are all connected to the outer peripheral wall 412 of the annular portion, and each mounting groove 200 is disposed opposite to at least one fixing protrusion 420.

[0107] The plurality of connecting portions 430, each connecting portion 430 is connected between the outer peripheral wall 412 of the annular portion and the pole portion 300, and the plurality of connecting portions 430 and the plurality of fixing protrusions 420 are arranged staggeredly.

[0108] The distance from the inner peripheral wall 414 to the outer peripheral wall of the annular portion is denoted as H 1 .

[0109] The distance from the center of the mounting hole 100 to the inner peripheral wall 414 of the annular portion is denoted as R0 .

[0110] The distance from the center of the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is denoted as R 1 .

[0111] Among them, H 1 ×(H 1 +2×R 0 ) < R 1 2 -R 0 2 .

[0112] A rotor punching sheet 1 provided in this application includes a punching sheet body 10

[0113] The punching sheet body 10 is provided with a mounting hole 100 and a plurality of mounting grooves 200. The plurality of mounting grooves 200 are arranged at intervals around the mounting hole 100. The mounting grooves 200 are used for mounting permanent magnets 900. The mounting grooves 200 are arranged at intervals from the mounting hole 100, and the mounting grooves 200 are arranged at intervals from the outer peripheral wall 700 of the punching sheet body

[0114] The part of the punching sheet body 10 between two adjacent mounting grooves 200 is a pole part 300. The part of the punching sheet body 10 between the mounting hole 100 and the mounting groove 200 is an inner magnetic bridge 400. The part of the punching sheet body 10 between the mounting groove 200 and the outer peripheral wall 700 of the punching sheet body is an outer magnetic bridge 500

[0115] The inner magnetic bridge 400 includes an annular part 410, a plurality of fixing protrusions 420 and a plurality of connecting parts 430

[0116] Among them, the annular part 410 has an inner peripheral wall and an outer peripheral wall. The inner peripheral wall 414 of the annular part encloses the mounting hole 100. The mounting holes 100 of a plurality of rotor punching sheets 1 penetrate along the axial direction of the rotor 8 to form an axial hole, and the rotating shaft of the motor is inserted into the axial hole

[0117] A plurality of fixing protrusions 420 are all connected to the outer peripheral wall 412 of the annular part. Any one of the plurality of fixing protrusions 420 is connected to the outer peripheral wall 412 of the annular part. Each mounting groove 200 is arranged opposite to at least one fixing protrusion 420. That is to say, each mounting groove 200 cooperates with at least one fixing protrusion 420. The fixing protrusion 420 has the function of supporting and fixing the permanent magnet 900 in the mounting groove 200. In this way, the matching dimensions of the permanent magnet 900, the punching sheet body 10 and the rotating shaft can be guaranteed, providing a reliable structural support for the effectiveness and feasibility of the motor operation

[0118] Any one of the plurality of connecting portions 430 is connected between the outer peripheral wall 412 of the annular portion and the pole portion 300. That is, the first end of the connecting portion 430 is connected to the outer peripheral wall 412 of the annular portion, and the second end of the connecting portion 430 is connected to the pole portion 300. It can also be said that the annular portion 410 and the pole portion 300 are assembled together through a plurality of connecting portions 430, which can ensure the mating dimensions of the rotating shaft, the punching sheet body 10, and the permanent magnet 900.

[0119] Compared with the related art in which the inner magnetic bridge 400 is removed and the rotor punching sheet 1 is formed by injection molding, this setting can improve the structural strength of the rotor punching sheet 1, reduce the occurrence probability of deformation of the rotor punching sheet 1, and ensure the stability and reliability of the motor operation.

[0120] Optionally, the punching sheet body 10 is integrally formed with an inner magnetic bridge 400. This structural setting simplifies the forming process of the punching sheet body 10 because the assembly process of the inner magnetic bridge 400 is omitted, which is beneficial to improving the processing efficiency of the product. And the structural strength of the rotor punching sheet 1 can be ensured.

[0121] Among them, the structure of the inner magnetic bridge 400 is further defined such that the distance from the inner peripheral wall 414 of the annular portion to the outer peripheral wall is H 1 , the distance from the center of the mounting hole 100 to the inner peripheral wall 414 of the annular portion is R 0 , the distance from the center of the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is R 1 , H 1 ×(H 1 +2×R 0 )<R 1 2 -R 0 2 . That is, the structure of the inner magnetic bridge 400 is optimized (for example, while ensuring the structural strength of the rotor punching sheet 1, the area of the inner magnetic bridge 400 can be reduced). On the basis of ensuring the effective assembly of the rotating shaft and the permanent magnet 900, the structural strength of the rotor punching sheet 1 can also be ensured, and the probability of deformation of the rotor punching sheet 1 can be reduced. Compared with the related art in which the rotor iron core is formed by injection molding, the mating dimensions of the rotor punching sheet 1, the permanent magnet 900, and the rotating shaft can be ensured, and the production cost of the product can also be reduced. In addition, this structural setting optimizes the structure of the inner magnetic bridge 400. In this way, it can play a role in reasonably arranging the magnetic field lines, which is beneficial to reducing magnetic leakage, achieving the effect of improving the torque density and suppressing torque ripple. That is to say, this setting takes into account the production cost, structural strength, and service performance of the product, which is beneficial to enhancing the market competitiveness of the product.

[0122] In some other embodiments, the punching sheet body 10 is provided with a clamping portion for fixing the permanent magnet 900.

[0123] Optionally, the fixing protrusion 420 extends from the outer peripheral wall 412 of the annular portion towards the mounting groove 200.

[0124] Optionally, the fixing protrusion 420 is located between the outer peripheral wall 412 of the annular portion and the mounting groove 200.

[0125] Optionally, a part of the fixing protrusion 420 extends into the mounting groove 200.

[0126] It can be understood that the mounting groove 200 communicates with the isolation groove 600. For example, the notch of the mounting groove 200 communicates with the isolation groove 600, and both the fixing protrusion 420 and the connecting portion 430 are located at the isolation groove 600. In this way, it can be ensured that the fixing protrusion 420 functions to fix the permanent magnet 900, and the usage requirements for connecting the connecting portion 430 between the annular portion 410 and the pole portion 300 can also be met.

[0127] It can be understood that the plurality of connecting portions 430 and the plurality of fixing protrusions 420 are arranged staggeredly. For example, the plurality of connecting portions 430 are arranged at intervals around the mounting hole 100, the plurality of fixing protrusions 420 are arranged at intervals around the mounting hole 100, and at least one fixing protrusion 420 is provided between any two adjacent connecting portions 430.

[0128] There is no interference between the connecting portion 430 and the fixing protrusion 420.

[0129] In some embodiments, optionally, H 1 , R 0 and R 1 satisfy: 0 < (H 1 ×(H 1 +2×R 0 )) / (R 1 2 -R 0 2 ) ≤ 0.5.

[0130] In this embodiment, the structure of the inner magnetic bridge 400 is further defined, such that H 1 , R 0 and R 1 satisfy: 0 < (H 1 ×(H 1 +2×R 0 )) / (R 1 2 -R 0 2 ) ≤ 0.5. In this way, the structure of the inner magnetic bridge 400 is further optimized, and further, the production cost, structural strength, and service performance of the product are further optimized, which is beneficial to enhancing the market competitiveness of the product.

[0131] Optionally, (H 1 ×(H1 +2×R 0 )) / (R 1 2 -R 0 2 ) = 0.45, (H 1 ×(H 1 +2×R 0 )) / (R 1 2 -R 0 2 ) = 0.4, (H 1 ×(H 1 +2×R 0 )) / (R 1 2 -R 0 2 ) = 0.35, (H 1 ×(H 1 +2×R 0 )) / (R 1 2 -R 0 2 ) = 0.3, (H 1 ×(H 1 +2×R 0 )) / (R 1 2 -R 0 2 ) = 0.25 and so on, which are not listed one by one here.

[0132] In some embodiments, optionally, H 1 , R 0 and R 1 satisfy: 0 < (H 1 ×(H 1 +2×R 0 )) / (R 1 2 -R 0 2 ) ≤ 0.33.

[0133] In this embodiment, the structure of the inner magnetic bridge 400 is further defined such that the relationship between H 1 , R 0 and R 1 satisfies: 0 < (H 1 ×(H 1 +2×R 0 )) / (R 1 2 -R 0 2) ≤ 0.33. In this way, the structure of the inner magnetic bridge 400 is further optimized, and further, the production cost, structural strength, and service performance of the product are optimized, which is beneficial to enhancing the market competitiveness of the product.

[0134] In some embodiments, optionally, as Figure 1 shown, H 1 , R 0 and R 1 satisfy: 0 < H 1 / (R 1 -R 0 ) ≤ 0.45.

[0135] In this embodiment, the structure of the inner magnetic bridge 400 is further defined such that the relationship between H 1 , R 0 and R 1 satisfies: 0 < H 1 / (R 1 -R 0 ) ≤ 0.45. That is, the relationship between the distance from the inner peripheral wall 414 to the outer peripheral wall of the annular portion, the distance from the center of the mounting hole 100 to the inner peripheral wall 414 of the annular portion, and the distance from the center of the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is defined.

[0136] When the above limitations are met, it has the effects of reducing magnetic leakage, increasing torque density, and suppressing torque ripple.

[0137] If H 1 / (R 1 -R 0 ) is greater than 0.45, then the size setting of the annular portion 410 is unreasonable. In this way, magnetic leakage will increase, torque density will decrease, and torque ripple will increase.

[0138] Optionally, H 1 / (R 1 -R 0 ) = 0.42, H 1 / (R 1 -R 0 ) = 0.4, H 1 / (R 1 -R 0 ) = 0.36, H 1 / (R 1 -R 0 ) = 0.35, H 1 / (R 1 -R 0 ) = 0.3, H 1 / (R 1 -R 0 ) = 0.28, etc., which are not listed one by one here.

[0139] In some embodiments, optionally, as Figure 3 shown, the thickness of the punching sheet body 10 is denoted as d.

[0140] Among them, H 1 ≥d.

[0141] In this embodiment, the structure of the punching sheet body 10 is further defined such that the thickness of the punching sheet body 10 is d, where the relationship between H 1 and d satisfies: H 1 ≥d.

[0142] This setting can ensure the structural strength of the rotor punching sheet 1, avoid deformation of the rotor punching sheet 1, and provide an effective and reliable structural support for ensuring the mating dimensions of the rotor punching sheet 1, the permanent magnet 900, and the rotating shaft.

[0143] If H 1 is less than d, then the structural strength of the product is low, the rotor punching sheet 1 is prone to deformation, and the structural strength of the rotor punching sheet 1 will be reduced.

[0144] Optionally, H 1 = 1.2×d, H 1 = 1.5×d, H 1 = 1.8×d, and H 1 = 2×d, etc., which are not listed one by one here.

[0145] In some embodiments, optionally, as Figure 1 and Figure 2 shown, the width of the fixing protrusion 420 in the circumferential direction of the rotor punching sheet 1 is denoted as w 1 .

[0146] The length of the fixing protrusion 420 in the direction from the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is denoted as b 1 .

[0147] The number of the fixing protrusions 420 is denoted as m 1 .

[0148] The width of the connecting portion 430 in the circumferential direction of the rotor punching sheet 1 is denoted as w 2 .

[0149] The length of the connecting portion 430 in the direction from the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is denoted as b 2 .

[0150] The number of the connecting portions 430 is denoted as m 2 .

[0151] The depth of the mounting groove 200 in the direction from the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is denoted as W m .

[0152] The distance from the center of the mounting hole 100 to the outer peripheral wall 412 of the annular portion is denoted as R. 2 .

[0153] Among them, w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 <π×((R 1 -W m ) 2 -R 2 2 ).

[0154] In this embodiment, the matching structure of the fixing protrusion 420, the connecting portion 430, the mounting hole 100 and the mounting groove 200 is defined. The width of the fixing protrusion 420 in the circumferential direction of the rotor punching 1 is w 1 The length of the fixing protrusion 420 in the direction from the mounting hole 100 to the outer peripheral wall 700 of the punch body is b. 1 , the number of the fixing protrusions 420 is m 1 The width of the connecting portion 430 in the circumferential direction of the rotor sheet 1 is w 2 The length of the connecting portion 430 in the direction from the mounting hole 100 to the outer peripheral wall 700 of the punch body is b. 2 , the number of the connecting parts 430 is m 2 The distance from the center of the mounting hole 100 to the outer peripheral wall 700 of the punch body is R 1 The depth of the mounting groove 200 in the direction from the mounting hole 100 to the outer peripheral wall 700 of the punch body is W m The distance from the center of the mounting hole 100 to the outer peripheral wall 412 of the annular portion is R 2 .w 1 , b 1 、m 1 、w 2 、b 2 、m 2 , R 1 , W m and R 2 Satisfy w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 <π×((R 1 -W m ) 2 -R 2 2) That is, the structure of the inner magnetic bridge 400 is optimized (for example, while ensuring the structural strength of the rotor punching 1, the area of the inner magnetic bridge 400 can be reduced). On the basis of ensuring the effective assembly of the rotating shaft and the permanent magnet 900, the structural strength of the rotor punching 1 can also be ensured, and the probability of deformation of the rotor punching 1 can be reduced. Compared with the formation of the rotor core by injection molding in the related art, the matching dimensions of the rotor punching 1, the permanent magnet 900, and the rotating shaft can be ensured, and the production cost of the product can also be reduced. In addition, the structural setting optimizes the structure of the inner magnetic bridge 400. More specifically, the matching dimensions of the inner magnetic bridge 400 and the permanent magnet 900 are optimized. In this way, the magnetic field lines can be reasonably distributed, which is beneficial to reducing magnetic leakage, improving the torque density, and suppressing torque ripple. That is to say, this setting takes into account the production cost, structural strength, and service performance of the product, which is beneficial to enhancing the market competitiveness of the product.

[0155] Optionally, w 1 , b 1 , m 1 , w 2 , b 2 , m 2 , R 1 , W m and R 2 satisfy: 0 < (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m )) 2 - R 2 2 )) ≤ 0.5.

[0156] Optionally, w 1 , b 1 , m 1 , w 2 , b 2 , m 2 , R 1 , W m and R 2 satisfy: 0 < (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m )) 2 - R 2 2 )) ≤ 0.3.

[0157] In some embodiments, optionally, as Figure 2 shown, the distance from the part of the outer peripheral wall 700 of the punching sheet body opposite to the pole part 300 to the center of the mounting hole 100 is denoted as R 11 .

[0158] The distance from the part of the outer peripheral wall 700 of the punching sheet body opposite to the mounting groove 200 to the center of the mounting hole 100 is denoted as R 22 .

[0159] The distance from the center of the mounting hole 100 to the pole part 300 is denoted as R 3 .

[0160] The width of the mounting groove 200 in the circumferential direction of the punching sheet body 10 is denoted as L m .

[0161] The distance from the mounting groove 200 to the outer edge of the punching sheet body 10 is denoted as h.

[0162] The number of pole pairs of the motor is denoted as p.

[0163] Wherein, 4 × p × L m × h < π × (R 11 + R 22 + 2 × R 3 ) × W m .

[0164] In some embodiments, optionally, the mating structure of the punching sheet body 10 is further defined such that the distance from the part of the outer peripheral wall 700 of the punching sheet body opposite to the pole part 300 to the center of the mounting hole 100 is R 11 , the distance from the part of the outer peripheral wall 700 of the punching sheet body opposite to the mounting groove 200 to the center of the mounting hole 100 is R 22 , the distance from the center of the mounting hole 100 to the pole part 300 is R 3 , the width of the mounting groove 200 in the circumferential direction of the punching sheet body 10 is L m , the distance from the mounting groove 200 to the outer edge of the punching sheet body 10 is h, and the number of pole pairs of the motor is P. Wherein, p, L m , h, R 11 , R 22 , R 3 and W m satisfy the relationship: 4 × p × L m × h < π × (R 11 + R 22 + 2 × R 3 ) × W mThat is, the structure of the outer magnetic bridge 500 is optimized (for example, while ensuring the structural strength of the rotor punching 1, the area of the outer magnetic bridge 500 can be reduced). On the basis of ensuring the effective assembly of the rotating shaft and the permanent magnet 900, the structural strength of the rotor punching 1 can also be ensured, and the probability of deformation of the rotor punching 1 can be reduced. Compared with the related art in which the rotor iron core is formed by injection molding, the matching dimensions of the rotor punching 1, the permanent magnet 900 and the rotating shaft can be ensured, and the production cost of the product can also be reduced. In addition, the structural setting optimizes the structure of the outer magnetic bridge 500. In this way, the magnetic field lines can be reasonably distributed, which is beneficial to reducing magnetic leakage, improving the torque density and suppressing torque ripple. That is to say, this setting takes into account the production cost, structural strength and service performance of the product, which is beneficial to enhancing the market competitiveness of the product.

[0165] Optionally, R 1 , R 2 , R 3 , L m , h and p satisfy: 0 < (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m ) < 0.2.

[0166] Optionally, R 1 , R 2 , R 3 , L m , h and p satisfy: 0 < (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m ) < 0.08.

[0167] In some embodiments, optionally, m 1 and p satisfy: m 1 = 2 × p; m 2 and p satisfy: m 2 = p, or m 2 = 2 × p.

[0168] In this embodiment, the relationship between m 1 , m 2 and p is further defined. So that m 1 and p satisfy: m 1 = 2 × p; m 2 and p satisfy: m 2 = p, or m 2 = 2 × p. The number of pole pairs of the motor is denoted as p.

[0169] where m 1 = 2×p, so that each fixing protrusion 420 cooperates with one mounting groove 200. More specifically, each fixing protrusion 420 is used to limit a permanent magnet 900.

[0170] where m 2 = p, or m 2 = 2×p, that is, the relationship between the number of connecting portions 430 and the number of pole pairs of the motor is defined.

[0171] Optionally, at least one fixing protrusion 420 is provided between two adjacent connecting portions 430.

[0172] In some embodiments, optionally, the fixing protrusion 420 includes at least one of a strip segment and an arc segment; and / or the connecting portion 430 includes at least one of a strip segment and an arc segment.

[0173] In this embodiment, the shapes of the fixing protrusion 420 and the connecting portion 430 are further defined.

[0174] where the fixing protrusion 420 includes a strip segment and / or an arc segment. For example, the fixing protrusion 420 includes a strip segment, for example, the fixing protrusion 420 includes an arc segment, for example, the fixing protrusion 420 includes a strip segment and an arc segment.

[0175] and / or the connecting portion 430 includes at least one of a strip segment and an arc segment. For example, the connecting portion 430 includes a strip segment, for example, the connecting portion 430 includes an arc segment, for example, the connecting portion 430 includes a strip segment and an arc segment.

[0176] In some embodiments, optionally, at least two fixing protrusions 420 are provided between any two adjacent connecting portions 430.

[0177] In this embodiment, the matching structure of the plurality of connecting portions 430 and the plurality of fixing protrusions 420 is defined, so that at least two fixing protrusions 420 are provided between any two adjacent connecting portions 430. For example, three fixing protrusions 420 are provided between any two adjacent connecting portions 430, for example, four fixing protrusions 420 are provided between any two adjacent connecting portions 430, etc., which are not listed one by one here.

[0178] This setting can not only ensure the structural strength of the rotor punching sheet 1, but also reduce the number of connecting portions 430, which is beneficial to reducing the cost of the rotor punching sheet 1.

[0179] In some other embodiments, one fixing protrusion 420 is provided between any two adjacent connecting portions 430.

[0180] Such as Figure 3As shown, a rotor 8 according to some other embodiments of the present application includes a rotor core 800 and a plurality of permanent magnets 900.

[0181] The rotor core 800 is formed by stacking a plurality of rotor punching sheets 1 as in any of the above embodiments.

[0182] The mounting grooves 200 of the plurality of rotor punching sheets 1 penetrate axially along the rotor core 800 to form a slot 810.

[0183] One permanent magnet 900 is disposed in each slot 810.

[0184] A rotor 8 provided by the present application includes a rotor core 800 and a plurality of permanent magnets 900.

[0185] The rotor core 800 includes a plurality of rotor punching sheets 1.

[0186] The rotor punching sheet 1 includes a punching sheet body 10.

[0187] The punching sheet body 10 is provided with a mounting hole 100 and a plurality of mounting grooves 200. The plurality of mounting grooves 200 are arranged at intervals around the mounting hole 100. The mounting grooves 200 are used for mounting the permanent magnets 900. The mounting grooves 200 are arranged at intervals from the mounting hole 100, and the mounting grooves 200 are arranged at intervals from the outer peripheral wall 700 of the punching sheet body.

[0188] The part of the punching sheet body 10 between two adjacent mounting grooves 200 is a pole part 300. The part of the punching sheet body 10 between the mounting hole 100 and the mounting grooves 200 is an inner magnetic bridge 400. The part of the punching sheet body 10 between the mounting grooves 200 and the outer peripheral wall 700 of the punching sheet body is an outer magnetic bridge 500.

[0189] The inner magnetic bridge 400 includes an annular part 410, a plurality of fixing protrusions 420 and a plurality of connecting parts 430.

[0190] Among them, the annular part 410 has an inner peripheral wall and an outer peripheral wall. The inner peripheral wall 414 of the annular part encloses the mounting hole 100. The mounting holes 100 of the plurality of rotor punching sheets 1 penetrate axially along the rotor 8 to form a shaft hole, and the rotating shaft of the motor is inserted into the shaft hole.

[0191] The plurality of fixing protrusions 420 are all connected to the outer peripheral wall 412 of the annular part. Any one of the plurality of fixing protrusions 420 is connected to the outer peripheral wall 412 of the annular part. Each mounting groove 200 is disposed opposite to at least one fixing protrusion 420. That is to say, each mounting groove 200 cooperates with at least one fixing protrusion 420. The fixing protrusion 420 has the function of supporting and fixing the permanent magnet 900 in the mounting groove 200. In this way, the matching dimensions of the permanent magnet 900, the punching sheet body 10 and the rotating shaft can be ensured, providing a reliable structural support for the effectiveness and feasibility of the motor operation.

[0192] Any one of the plurality of connecting portions 430 is connected between the outer peripheral wall 412 of the annular portion and the pole portion 300. That is, the first end of the connecting portion 430 is connected to the outer peripheral wall 412 of the annular portion, and the second end of the connecting portion 430 is connected to the pole portion 300. It can also be said that the annular portion 410 and the pole portion 300 are assembled together through a plurality of connecting portions 430, which can ensure the matching dimensions of the rotating shaft, the punching sheet body 10, and the permanent magnet 900.

[0193] Compared with the related art in which the inner magnetic bridge 400 is removed and the rotor punching sheet 1 is formed by injection molding, this setting can improve the structural strength of the rotor punching sheet 1, reduce the occurrence probability of deformation of the rotor punching sheet 1, and ensure the stability and reliability of the motor operation.

[0194] Optionally, the punching sheet body 10 is integrally formed with an inner magnetic bridge 400. This structural setting simplifies the forming process of the punching sheet body 10 because the assembly process of the inner magnetic bridge 400 is omitted, which is beneficial to improving the processing efficiency of the product. And the structural strength of the rotor punching sheet 1 can be ensured.

[0195] Among them, the structure of the inner magnetic bridge 400 is further defined such that the distance from the inner peripheral wall 414 of the annular portion to the outer peripheral wall is H 1 , the distance from the center of the mounting hole 100 to the inner peripheral wall 414 of the annular portion is R 0 , the distance from the center of the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is R 1 , H 1 ×(H 1 +2×R 0 )<R 1 2 -R 0 2 . That is, the structure of the inner magnetic bridge 400 is optimized (for example, while ensuring the structural strength of the rotor punching sheet 1, the area of the inner magnetic bridge 400 can be reduced). On the basis of ensuring the effective assembly of the rotating shaft and the permanent magnet 900, the structural strength of the rotor punching sheet 1 can be ensured, and the probability of deformation of the rotor punching sheet 1 can be reduced. Compared with the related art in which the rotor iron core is formed by injection molding, the matching dimensions of the rotor punching sheet 1, the permanent magnet 900, and the rotating shaft can be ensured, and the production cost of the product can be reduced. In addition, this structural setting optimizes the structure of the inner magnetic bridge 400. In this way, it can play a role in reasonably arranging the magnetic force lines, which is beneficial to reducing magnetic leakage, achieving the effect of improving the torque density and suppressing torque ripple. That is to say, this setting takes into account the production cost, structural strength, and service performance of the product, which is beneficial to enhancing the market competitiveness of the product.

[0196] In some embodiments, optionally, such as Figure 3As shown, in the rotor punching sheet 1, the part of the isolation groove 600 located between two adjacent connecting parts 430 is the sub-groove 610.

[0197] The multiple rotor punching sheets 1 include a first rotor punching sheet 1a and a second rotor punching sheet 1b.

[0198] The sub-groove 610 of the first rotor punching sheet 1a is disposed opposite to the connecting part 430 of the second rotor punching sheet 1b.

[0199] The connecting part 430 of the first rotor punching sheet 1a and the sub-groove 610 of the second rotor punching sheet 1b are disposed opposite to each other.

[0200] In this embodiment, in the rotor punching sheet 1, the part of the isolation groove located between two adjacent connecting parts 430 is the sub-groove 610.

[0201] And the types of the multiple rotor punching sheets 1 are divided. The multiple rotor punching sheets 1 include a first rotor punching sheet 1a and a second rotor punching sheet 1b. Among them, the sub-groove 610 of the first rotor punching sheet 1a is disposed opposite to the connecting part 430 of the second rotor punching sheet 1b, and the connecting part 430 of the first rotor punching sheet 1a and the sub-groove 610 of the second rotor punching sheet 1b are disposed opposite to each other. This setting is beneficial to eliminating the magnetic leakage at the shaft end and making the overall magnetic force line distribution more uniform.

[0202] Optionally, the number of the first rotor punching sheets 1a is multiple, and the number of the second rotor punching sheets 1b is multiple. At least one second rotor punching sheet 1b is disposed between any two adjacent first rotor punching sheets 1a. Or, at least one first rotor punching sheet 1a is disposed between any two adjacent second rotor punching sheets 1b.

[0203] A motor according to some other embodiments of the present application includes a rotor 8 as in any of the above embodiments.

[0204] A motor provided by the present application includes a rotor 8. Therefore, it has all the beneficial effects of the above rotor 8, and will not be elaborated one by one here.

[0205] A chassis system according to some other embodiments of the present application includes a rotor 8 as in any of the above embodiments; or a motor as in the above embodiments.

[0206] A chassis system provided by the present application includes a rotor 8 and a motor. Therefore, it has all the beneficial effects of the above rotor 8 or the motor, and will not be elaborated one by one here.

[0207] A vehicle according to some other embodiments of the present application includes a rotor 8 as in the above embodiments; or a motor as in the above embodiments; or a chassis system as in the above embodiments.

[0208] A vehicle provided by the present application includes a rotor 8, or the vehicle includes an electric motor, or the vehicle includes a chassis system. Therefore, all the beneficial effects of one of the above-mentioned rotor, electric motor, and chassis system are achieved, and will not be elaborated one by one herein.

[0209] It should be noted that the vehicle can be a new energy vehicle. New energy vehicles include battery electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0210] Optionally, the rotor punching sheet 1 includes: a punching sheet body 10, the punching sheet body 10 has a mounting hole 100, a plurality of mounting grooves 200, and an inner magnetic bridge 400 surrounding the mounting hole 100. The plurality of mounting grooves 200 are distributed along the circumferential direction of the punching sheet body 10. The part of the punching sheet body 10 between adjacent mounting grooves 200 is a pole part 300, and the part of the punching sheet body 10 at the outer end of the mounting groove 200 and the outer peripheral wall 700 of the punching sheet body is an outer magnetic bridge 500. An inner magnetic bridge 400 is provided at the inner end of the adjacent mounting grooves 200 and the pole part 300 between the adjacent mounting grooves 200, and an isolation groove 600 is provided between the inner magnetic bridge 400, the pole part 300, and the mounting groove 200. The inner magnetic bridge 400 includes an annular part 410, a plurality of fixing protrusions 420, and a plurality of connecting parts 430.

[0211] The distance from the inner peripheral wall 414 to the outer peripheral wall of the annular part 410 is denoted as H 1 , satisfying 0 < (H 1 ×(H 1 + 2×R 0 )) / (R 1 2 - R 0 2 ) ≤ 0.5, where the distance from the center of the mounting hole 100 to the inner peripheral wall 414 of the annular part is denoted as R 0 , and the distance from the center of the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is denoted as R 1 . The rotor punching sheet 1 provided by the present application effectively improves the torque density and suppresses the torque ripple.

[0212] H 1 , R 0 and R 1 satisfy: 0 < (H 1 ×(H 1 + 2×R 0 )) / (R 1 2 - R 0 2 ) ≤ 0.33.

[0213] H 1 satisfies 0 < H 1 / (R 1 - R0 ) ≤ 0.45.

[0214] H1 satisfies H 1 ≥ d, where d is the thickness of the punching sheet body 10.

[0215] The number of the connecting parts 430 is p or 2p, where p is the number of pole pairs of the motor.

[0216] The number of the fixing protrusions 420 is 2p.

[0217] The rotor core 800 includes: a plurality of rotor punching sheets 1, which are stacked along the axial direction of the punching sheet body 10. Among them, the mounting holes 100 of the plurality of rotor punching sheets 1 communicate with each other to form a shaft hole, and each mounting groove 200 of the plurality of rotor punching sheets 1 communicates with each other to form a slot 810.

[0218] A plurality of permanent magnets 900 are respectively accommodated in the plurality of slots 810.

[0219] The plurality of rotor punching sheets 1 are stacked in a rotary manner. That is to say, the plurality of rotor punching sheets 1 include a first rotor punching sheet 1a and a second rotor punching sheet 1b. The sub-slot 610 of the first rotor punching sheet 1a is disposed opposite to the connecting part 430 of the second rotor punching sheet 1b, and the connecting part 430 of the first rotor punching sheet 1a and the sub-slot 610 of the second rotor punching sheet 1b are disposed opposite to each other.

[0220] The isolation groove 600 is filled with air or a non-magnetic conductive material.

[0221] Take (H 1 × (H 1 + 2 × R 0 )) and (R 1 2 - R 0 2 ) ratio is denoted as X1. Figure 4 Shows the trend of the output torque of the motor and the cost of the rotor 8 changing with the change of X1.

[0222] Taking a 12-slot 10-pole permanent magnet motor as an example, the number of pole pairs p of the motor = 5. Figure 4 Shows the simulation results of the output torque, torque ripple and the cost of the rotor 8 under different X1. Among them, Te* and Cost* are per-unit values. Te* is the ratio of the output torque under different X1 to the output torque when X1 = 0, and Cost* is the ratio of the output torque under different X1 to the cost of the rotor 8 when X1 = 0. When 0 < (H 1 × (H 1 + 2 × R 0 )) / (R 1 2 - R 0 2) ≤ 0.5 range, the output torque Te* of the motor > 0.7, Cost* < 1.35. When 0 < (H 1 ×(H 1 +2×R 0 )) / (R 1 2 -R 0 2 ) ≤ 0.33 range, the output torque Te* of the motor > 0.85, Cost* < 1.2, and the cost performance is better.

[0223] Denote the ratio of H 1 and (R 1 -R 0 ) as X2. Figure 5 Shows the trends of the output torque of the motor and the cost of the rotor 8 changing with X2.

[0224] Taking a 12-slot 10-pole permanent magnet motor as an example, the number of pole pairs p of the motor = 5. Figure 5 The simulation results of the output torque, torque ripple, and the cost of the rotor 8 under different X2 are shown. Among them, both Te* and Cost* are per-unit values. Te* is the ratio of the output torque under different X1 to the output torque when X2 = 0, and Cost* is the ratio of the output torque under different X2 to the cost of the rotor 8 when X2 = 0. When 0 < H 1 / (R 1 -R 0 ) ≤ 0.45 range, the output torque Te* of the motor > 0.86, Cost* < 1.2, and the cost performance is better.

[0225] Optionally, the number of connecting parts 430 is 2p, where p is the number of pole pairs of the motor.

[0226] Optionally, denote the width of the mounting groove 200 in the circumferential direction of the punching sheet body 10 as L m , and denote the thickness of the punching sheet body 10 as d. Among them, d ≤ w 1 ≤ 0.75×L m , 0 < b 1 ≤ R 1 -R 2 -(2×W m ) / 3.

[0227] Further limit the mating structure of the punching sheet body 10 so that the width of the mounting groove 200 in the circumferential direction of the punching sheet body 10 is L m , and denote the thickness of the punching sheet body 10 as d. The relationship between L m and d satisfies: d ≤ w 1 ≤ 0.75×L m , 0 < b 1 ≤ R 1 -R2 -(2 × W m ) / 3。

[0228] Wherein, d ≤ w 1 ≤ 0.75 × L m , that is, the relationship between the thicknesses of the installation groove 200, the fixing protrusion 420, and the punching sheet body 10 is defined. This setting can ensure the structural strength of the rotor punching sheet 1, avoid deformation of the rotor punching sheet 1, provide an effective and reliable structural support for ensuring the fitting dimensions of the rotor punching sheet 1, the permanent magnet 900, and the rotating shaft, and also has the effects of reducing magnetic leakage, increasing torque density, and suppressing torque ripple.

[0229] If w 1 is less than d, then the structural strength of the product is low, and it cannot effectively limit the permanent magnet 900, and the fitting dimensions of the rotor punching sheet 1 and the permanent magnet 900 cannot be ensured.

[0230] If w 1 is greater than 0.75 × L m , then the size of the fixing protrusion 420 is large, which will increase the fitting dimension between the fixing protrusion 420 and the permanent magnet 900. In this way, magnetic leakage will increase, torque density will decrease, and torque ripple will increase.

[0231] Optionally, w 1 = 0.72 × L m , w 1 = 0.7 × L m , w 1 = 0.68 × L m and so on, which will not be listed one by one here.

[0232] Wherein, 0 < b 1 ≤ R 1 - R 2 -(2 × W m ) / 3. This setting can ensure the structural strength of the rotor punching sheet 1, avoid deformation of the rotor punching sheet 1, provide an effective and reliable structural support for ensuring the fitting dimensions of the rotor punching sheet 1, the permanent magnet 900, and the rotating shaft, and also has the effects of reducing magnetic leakage, increasing torque density, and suppressing torque ripple.

[0233] If b 1 is greater than R 1 - R 2 -(2 × W m ) / 3, then the size of the fixing protrusion 420 is large, which will increase the fitting dimension between the fixing protrusion 420 and the permanent magnet 900. In this way, magnetic leakage will increase, torque density will decrease, and torque ripple will increase.

[0234] Optionally, the width of the installation groove 200 in the circumferential direction of the punching sheet body 10 is L m, the thickness of the punching sheet body 10 is denoted as d, where d ≤ w 2 ≤ 0.75×L m , 0 < b 2 ≤ R 1 -R 2 -W m .

[0235] In this embodiment, the structure of the punching sheet body 10 is further defined such that the circumferential width of the installation groove 200 is L m , the thickness of the punching sheet body 10 is d, L m and the relationship between d satisfies: d ≤ w 2 ≤ 0.75×L m , 0 < b 2 ≤ R 1 -R 2 -W m .

[0236] Among them, d ≤ w 2 ≤ 0.75×L m , that is, the relationship between the thicknesses of the installation groove 200, the connecting portion 430 and the punching sheet body 10 is defined. This setting can ensure the structural strength of the rotor punching sheet 1, avoid deformation of the rotor punching sheet 1, provide an effective and reliable structural support for ensuring the fitting dimensions of the rotor punching sheet 1, the permanent magnet 900 and the rotating shaft, and also has the effects of reducing magnetic leakage, increasing the torque density, and suppressing torque ripple.

[0237] If w 2 is less than d, then the structural strength of the product is low, and it cannot effectively limit the permanent magnet 900, and the fitting dimensions of the rotor punching sheet 1 and the permanent magnet 900 cannot be guaranteed.

[0238] If w 2 is greater than 0.75×L m , then the size of the connecting portion 430 is large. In this way, magnetic leakage will increase, the torque density will decrease, and torque ripple will increase.

[0239] Optionally, w 2 = 0.72×L m , w 2 = 0.7×L m , w 2 = 0.68×L m and so on, which will not be listed one by one here.

[0240] Among them, 0 < b 2 ≤ R 1 -R 2 -W m, this setting can ensure the structural strength of the rotor punching sheet 1, avoid deformation of the rotor punching sheet 1, provide an effective and reliable structural support for ensuring the matching dimensions of the rotor punching sheet 1, the permanent magnet 900 and the rotating shaft, and also has the effects of reducing magnetic leakage, increasing the torque density, and suppressing torque ripple.

[0241] If b 2 is greater than R 1 -R 2 -W m , then the size of the connecting portion 430 is relatively large, which will change the layout of the magnetic field lines. In this way, the magnetic leakage will increase, the torque density will decrease, and the torque ripple will increase.

[0242] Among them, Figure 1 the dotted line in represents the permanent magnet 900. Optionally, the chassis system includes a transmission 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.

[0243] In this application, the term "a plurality of" means two or more, unless otherwise clearly defined. Terms such as "install", "connect", "connection", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be directly connected or indirectly connected 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 situations.

[0244] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments" and the like 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 are only the preferred embodiments of this application and are 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 in the protection scope of this application.

Claims

1. A rotor punching sheet, characterized in that, for a motor, the rotor punching sheet comprises: a punching sheet body, the punching sheet body is provided with a mounting hole and a plurality of mounting grooves, the plurality of mounting grooves are arranged at intervals around the mounting hole, a part of the punching sheet body between two adjacent mounting grooves is a pole part, a part of the punching sheet body between the mounting hole and the mounting groove is an inner magnetic bridge, and a part of the punching sheet body between the mounting groove and the outer peripheral wall of the punching sheet body is an outer magnetic bridge; The inner magnetic bridge includes: a ring portion, the ring portion is arranged around the mounting hole, an outer peripheral wall of the ring portion is arranged at an interval from the pole part to enclose an isolation groove, and the mounting groove communicates with the isolation groove; a plurality of fixing protrusions, the plurality of fixing protrusions are all connected to the outer peripheral wall of the ring portion, and each mounting groove is arranged opposite to at least one fixing protrusion; a plurality of connecting portions, each connecting portion is connected between the outer peripheral wall of the ring portion and the pole part, and the plurality of connecting portions and the plurality of fixing protrusions are arranged staggeredly; The distance from the inner peripheral wall to the outer peripheral wall of the annular portion is denoted as H 1 , the distance from the center of the mounting hole to the inner peripheral wall of the annular portion is denoted as R 0 , the distance from the center of the mounting hole to the outer peripheral wall of the punching sheet body is denoted as R 1 , where, H 1 ×(H 1 +2×R 0 ) < R 1 2 -R 0 2 .

2. The rotor punching sheet according to claim 1, characterized in that, H 1 、R 0 and R 1 satisfy: 0 < (H 1 × (H 1 + 2 × R 0 )) / (R 1 2 - R 0 2 ) ≤ 0.

5.

3. The rotor punching sheet according to claim 1, characterized in that, H 1 , R 0 and R 1 satisfy: 0 < (H 1 × (H 1 + 2 × R 0 )) / (R 1 2 - R 0 2 ) ≤ 0.33 4. The rotor punching sheet according to any one of claims 1 to 3, characterized in that, H 1 、R 0 and R 1 satisfy: 0 < H 1 / (R 1 - R 0 ) ≤ 0.

45.

5. The rotor punching sheet according to any one of claims 1 to 3, characterized in that, The thickness of the punching sheet body is denoted as d, where H 1 ≥ d.

6. The rotor punching sheet according to any one of claims 1 to 3, characterized in that, The width of the fixing protrusion in the circumferential direction of the rotor punching sheet is denoted as w 1 The length of the fixing protrusion in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is denoted as b 1 The number of the fixing protrusions is denoted as m 1 The width of the connecting portion in the circumferential direction of the rotor punching sheet is denoted as w 2 The length of the connecting portion in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is denoted as b 2 The number of the connecting portions is denoted as m 2 The depth of the mounting groove in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is denoted as W m The distance from the center of the mounting hole to the outer peripheral wall of the annular portion is denoted as R 2 ; where w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 <π×((R 1 -W m ) 2 -R 2 2 )。 7. The rotor punching sheet according to claim 6, characterized in that, The distance from the part of the outer peripheral wall of the punching sheet body opposite to the pole part to the center of the mounting hole is denoted as R 11 , the distance from the part of the outer peripheral wall of the punching sheet body opposite to the mounting groove to the center of the mounting hole is denoted as R 22 , the distance from the center of the mounting hole to the pole part is denoted as R 3 , the width of the mounting groove in the circumferential direction of the punching sheet body is denoted as L m , the distance from the mounting groove to the outer edge of the punching sheet body is denoted as h, the number of pole pairs of the motor is denoted as p, where 4 × p × L m × h < π × (R 11 + R 22 + 2 × R 3 ) × W m .

8. The rotor punching sheet according to claim 7, characterized in that, m 1 and p satisfy: m 1 = 2 × p; m 2 and p satisfy: m 2 = p, or m 2 = 2 × p.

9. The rotor punching sheet according to any one of claims 1 to 3, characterized in that, the fixing protrusion includes at least one of a strip segment and an arc segment; and / or the connecting portion includes at least one of a strip segment and an arc segment.

10. A rotor, characterized in that, comprises: a rotor core, the rotor core is formed by stacking a plurality of rotor punching sheets according to any one of claims 1 to 9, and the mounting grooves of the plurality of rotor punching sheets penetrate along the axial direction of the rotor core to form slots; a plurality of permanent magnets, and one permanent magnet is arranged in each slot.

11. The rotor according to claim 10, characterized in that, in the rotor punching sheet, a part of the isolation groove between two adjacent connecting portions is a sub-groove; the plurality of rotor punching sheets include a first rotor punching sheet and a second rotor punching sheet, the sub-groove of the first rotor punching sheet is arranged opposite to the connecting portion of the second rotor punching sheet, and the connecting portion of the first rotor punching sheet and the sub-groove of the second rotor punching sheet are arranged opposite to each other.

12. The rotor according to claim 11, characterized in that, the number of the first rotor punching sheets and the second rotor punching sheets is both a plurality; at least one second rotor punching sheet is stacked between two adjacent first rotor punching sheets, or at least one first rotor punching sheet is stacked between two adjacent second rotor punching sheets.

13. A motor, characterized in that, comprises: a rotor according to any one of claims 10 to 12.

14. A chassis system, It is characterized in that including: a rotor as described in any one of claims 10 to 12; or an electric machine as described in claim 13.

15. A vehicle It is characterized in that including: a rotor as described in any one of claims 10 to 12; or an electric machine as described in claim 13; or a chassis system as described in claim 14.

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