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 width of the fixing protrusions in the circumferential direction of the rotor punching sheet is recorded as w1, the length of the fixing protrusions in the direction from the mounting holes to the outer circumferential wall of the punching sheet body is recorded as b1, the number of the fixing protrusions is recorded as m1, the width of the connecting parts in the circumferential direction of the rotor punching sheet is recorded as w2, and the length of the connecting parts in the direction from the mounting holes to the outer circumferential wall of the punching sheet body is recorded as b2. The number of the connecting parts is recorded as m2, the distance from the center of the mounting hole to the outer peripheral wall of the punching sheet body is recorded as R1, the depth of the mounting groove in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is recorded as Wm, and the distance from the center of the mounting hole to the outer peripheral wall of the annular part is recorded as R2; wherein w1 * b1 * m1 + w2 * b2 * m2 < pi * ((R1-Wm) 2-R22).

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] Permanent magnet motors have the advantages of simple structure, low loss, and high efficiency. However, permanent magnet motors inevitably have cogging torque and torque pulsation problems. In the related art, the torque pulsation problem is solved by removing the inner magnetic bridge and forming the rotor core by injection molding. This setting 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, 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, the portion of the punching sheet body located between two adjacent mounting grooves is a pole portion, the portion of the punching sheet body located between the mounting hole and the mounting groove is an internal magnetic bridge, and the portion of the punching sheet body located between the mounting groove and the outer peripheral wall of the punching sheet body is an external magnetic bridge; the internal magnetic bridge comprises: an annular portion, the inner peripheral wall of the annular portion encloses the mounting hole, the outer peripheral wall of the annular portion is arranged at intervals with the pole portion to enclose an isolation groove, and the mounting groove is connected to the isolation groove; a plurality of fixing protrusions, the plurality of fixing protrusions are all connected to the outer peripheral wall of the annular 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 annular portion and the pole portion, and the plurality of connecting portions and the plurality of fixing protrusions are arranged in a staggered manner; the width of the fixing protrusion in the circumferential direction of the rotor punching sheet is recorded as w 1 The length of the fixing protrusion in the direction from the mounting hole to the outer peripheral wall of the punch body is recorded as b 1 , the number of fixed protrusions is denoted as m 1 The width of the connecting part in the circumferential direction of the rotor punching is recorded as w 2 The length of the connecting portion from the mounting hole to the outer peripheral wall of the punch body is recorded as b 2, the number of connecting parts is denoted as m 2 , the distance from the center of the mounting hole to the outer peripheral wall of the punching sheet body is denoted as R 1 , 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 part 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 ).

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

[0011] 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. The mounting grooves are used for mounting permanent magnets. The mounting grooves are arranged at intervals from the mounting hole, and the mounting grooves are arranged at intervals from 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 groove is an inner magnetic bridge, and the 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.

[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 punching sheet 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. 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 where the inner magnetic bridge is removed and the rotor punching is formed by injection molding, this setting can improve the structural strength of the rotor punching, reduce the occurrence probability of deformation of the rotor punching, and ensure the stability and reliability of the motor operation.

[0018] Optionally, the punching body is integrally formed with an inner magnetic bridge. This structural setting simplifies the forming process of the punching 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 can be guaranteed.

[0019] Furthermore, 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 related art in which the rotor iron core is formed by injection molding, 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 also 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 lines of force 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.

[0020] It can be understood that the installation groove communicates with the isolation groove. For example, the notch of the installation groove communicates with the isolation groove, and both the fixing protrusion and the connecting part are located at the isolation groove. In this way, it can be ensured that the fixing protrusion has the function of fixing the permanent magnet, and the use requirement that the connecting part is connected between the annular part and the pole part can also be satisfied.

[0021] It can be understood that the multiple connecting parts and the multiple fixing protrusions are arranged staggeredly. For example, the multiple connecting parts are arranged at intervals around the installation hole, the multiple fixing protrusions are arranged at intervals around the installation hole, and at least one fixing protrusion is arranged between any two adjacent connecting parts.

[0022] It can be understood that the punching sheet body is sectioned along the axial direction perpendicular to the rotor punching sheet. In the section, the contour line of the fixing convex part 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 punching sheet. The point on the first line segment is denoted as the first point, and along the circumferential direction of the rotor punching sheet, 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 w 1 。w 2 The determination of w is the same as that of w 1 , which will not be elaborated here.

[0023] It can be understood that the punching sheet body is sectioned along the axial direction perpendicular to the rotor punching sheet. In the section, the contour line of the fixing convex part 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 installation hole to the outer peripheral wall of the punching sheet body. The point on the third line segment is denoted as the third point, and along the direction from the installation hole to the outer peripheral wall of the punching sheet body, the point on the fourth line segment 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 b 1 。b 2 The determination of b is the same as that of b 1 , which will not be elaborated here.

[0024] It is understandable 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 installation groove is denoted as the fifth point. In the direction from the installation hole to the outer peripheral wall of the lamination body, the distance from the fifth point to the notch of the installation groove is denoted as W m .

[0025] According to the rotor lamination of the present application described above, the following additional technical features may also be provided:

[0026] In some embodiments, 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.

[0027] In this embodiment, the mating structure of the installation hole, the installation groove and the inner magnetic bridge is further defined, such that 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. 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, (w 1 ×b 1 ×m1 +w 2 ×b 2 ×m 2 ) / (π×((R 1 -W m ) 2 -R 2 2 )) = 0.4, (w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 ) / (π×((R 1 -W m ) 2 -R 2 2 )) = 0.3, (w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 ) / (π×((R 1 -W m ) 2 -R 2 2 )) = 0.2 and so on, which are not listed one by one here.

[0029] In some embodiments, 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.

[0030] In this embodiment, the mating structure of the mounting hole, the mounting groove and the inner magnetic bridge is further defined, such that w 1 , b 1 , m 1 , w 2 , b 2 , m 2 , R1 , W m and R 2 satisfy the relationship: 0 < (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m )) 2 - R 2 2 )) ≤ 0.3. 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.

[0031] Optionally, (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m )) 2 - R 2 2 )) = 0.25, (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m )) 2 - R 2 2 )) = 0.21, (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m )) 2 - R 2 2 )) = 0.15, etc., which are not listed one by one here.

[0032] In some embodiments, optionally, the width of the installation groove in the circumferential direction of the rotor punching sheet is denoted as L m , and the thickness of the punching sheet body is denoted as d, where d ≤ w 1 ≤ 0.75 × L m , 0 < b 1 ≤ R 1-R 2 -(2 × W m ) / 3。

[0033] In this embodiment, the mating structure of the punching sheet body is further defined such that the width of the mounting groove in the circumferential direction of the rotor punching sheet is L m , the thickness of the punching sheet body is denoted as d, and the relationship between L m and d satisfies: d ≤ w 1 ≤ 0.75 × L m , 0 < b 1 ≤ R 1 -R 2 -(2 × W m ) / 3。

[0034] Among them, d ≤ w 1 ≤ 0.75 × L m , that is, the relationship between the thicknesses of the mounting groove, the fixing protrusion, and the punching sheet body is defined. This setting can ensure the structural strength of the rotor punching sheet, avoid deformation of the rotor punching sheet, provide an effective and reliable structural support for ensuring the mating dimensions of the rotor punching sheet, the permanent magnet, and the rotating shaft, and also has the effects of reducing magnetic leakage, increasing the torque density, and suppressing torque ripple.

[0035] If w 1 is less than d, then the structural strength of the product is low, and it cannot effectively limit the permanent magnet, and the mating dimensions of the rotor punching sheet and the permanent magnet cannot be guaranteed.

[0036] If w 1 is greater than 0.75 × L m , then the size of the fixing protrusion is large, which will increase the mating dimension between the fixing protrusion and the permanent magnet. In this way, it will increase magnetic leakage, reduce the torque density, and increase torque ripple.

[0037] 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.

[0038] Among them, 0 < b 1 ≤ R 1 -R 2 -(2 × W m ) / 3. This setting can ensure the structural strength of the rotor punching sheet, avoid deformation of the rotor punching sheet, provide an effective and reliable structural support for ensuring the mating dimensions of the rotor punching sheet, the permanent magnet, and the rotating shaft, and also has the effects of reducing magnetic leakage, increasing the torque density, and suppressing torque ripple.

[0039] If b1 Greater than R 1 -R 2 -(2×W m ) / 3, then, the size of the fixing protrusion is relatively large, which will increase the mating size between the fixing protrusion and the permanent magnet. In this way, it will increase the magnetic leakage, reduce the torque density, and increase the torque ripple.

[0040] It can be understood that the lamination body is sectioned along the axial direction perpendicular to the rotor lamination. In the section, the contour lines of the two side walls of the installation 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 lamination, the point on the sixth line segment 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 .

[0041] In some embodiments, optionally, the circumferential width of the installation groove is denoted as L m , the thickness of the lamination body is denoted as d, where d ≤ w 2 ≤ 0.75×L m , 0 < b 2 ≤ R 1 -R 2 -W m .

[0042] In this embodiment, the structure of the lamination body is further defined such that the circumferential width of the installation groove is L m , the thickness of the lamination body is d, and the relationship between L m and d satisfies: d ≤ w 2 ≤ 0.75×L m , 0 < b 2 ≤ R 1 -R 2 -W m .

[0043] Among them, d ≤ w 2 ≤ 0.75×L m , that is, the relationship between the thicknesses of the installation groove, the connecting portion, and the lamination body is defined. This setting can ensure the structural strength of the rotor lamination, avoid deformation of the rotor lamination, provide an effective and reliable structural support for ensuring the mating dimensions of the rotor lamination, the permanent magnet, and the rotating shaft, and also has the effects of reducing magnetic leakage, increasing the torque density, and suppressing torque ripple.

[0044] If w 2 is less than d, then the structural strength of the product is low, and it cannot effectively limit the permanent magnet, and the mating dimensions of the rotor lamination and the permanent magnet cannot be guaranteed.

[0045] If w 2 is greater than 0.75×L m, then, the size of the connecting part is large, which will increase magnetic leakage, reduce torque density, and increase torque ripple.

[0046] 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.

[0047] Among them, 0 < b 2 ≤ R 1 - R 2 - W m , this setting can ensure the structural strength of the rotor punching sheet, avoid deformation of the rotor punching sheet, provide effective and reliable structural support for ensuring the matching dimensions of the rotor punching sheet, permanent magnet and rotating shaft, and also has the functions of reducing magnetic leakage, increasing torque density, and suppressing torque ripple.

[0048] If b 2 is greater than R 1 - R 2 - W m , then, the size of the connecting part is large, which will change the layout of the magnetic field lines, and thus, will increase magnetic leakage, reduce torque density, and increase torque ripple.

[0049] In some embodiments, optionally, the distance from the inner peripheral wall to the outer peripheral wall of the annular part is denoted as H 1 , the distance from the center of the mounting hole to the inner peripheral wall of the annular part is denoted as R 0 , among which, H 1 × (H 1 + 2 × R 0 ) < R 1 2 - R 0 2 .

[0050] In this embodiment, the structure of the punching sheet body is further defined such that the distance from the inner peripheral wall to the outer peripheral wall of the annular part is H 1 , the distance from the center of the mounting hole to the inner peripheral wall of the annular part is R 0 . Among them, the relationship between H 1 , R 0 and R 1 satisfies: H 1 × (H 1 + 2 × R 0 ) < R 1 2 - R 0 2 .

[0051] Further define the mating structure of the mounting hole, the outer peripheral wall of the punching sheet body, and the inner magnetic bridge, that is, further optimize the structure of the inner magnetic bridge (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 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 also 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 role of reasonably arranging the magnetic field lines can be played, 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.

[0052] 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.

[0053] 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.

[0054] In some embodiments, optionally, 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 peripheral wall 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 .

[0055] In this embodiment, the structure of the punching sheet body is further defined such that the distance from the portion of the outer peripheral wall of the punching sheet body opposite to the pole portion to the center of the mounting hole is R 11 and the distance from the portion of the outer peripheral wall of the punching sheet body opposite 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 R 3 and the width of the mounting groove in the circumferential direction of the punching sheet body is L m and the distance from the mounting groove to the outer peripheral wall of the punching sheet body is h. 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 m . That is to say, 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 related technology of forming the rotor iron core by injection molding, 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, this structural setting optimizes the structure of the outer 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.

[0056] Optionally, R 11 , R 22 , R 3 , L m , h and p satisfy: 0 < (4×p×L m ×h) / (π×(R 11 +R 22 +2×R 3 )×W m ) < 0.2.

[0057] Optionally, R 11 , R 22 , R 3 , L m , h and p satisfy: 0 < (4×p×L m ×h) / (π×(R 11 +R 22 +2×R 3 )×W m ) < 0.08.

[0058] It is understandable that the laminar body is sectioned along the axis 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 laminar body, the point on the contour line of the outer peripheral wall of the laminar body that is oppositely arranged with the seventh point is denoted as the eighth point, and the distance from the seventh point to the eighth point is denoted as h.

[0059] 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; wherein, p is the number of pole pairs of the motor.

[0060] In this embodiment, the relationship between m 1 , m 2 and p is further defined. Such 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.

[0061] Wherein, 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.

[0062] Wherein, 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.

[0063] 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.

[0064] In this embodiment, the shapes of the fixing protrusion and the connecting part are further defined.

[0065] Wherein, the fixing protrusion includes a strip segment and / or an arc segment. For example, the fixing protrusion includes a strip segment, for example, the fixing protrusion includes an arc segment, for example, the fixing protrusion includes a strip segment and an arc segment.

[0066] 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, for example, the connecting part includes an arc segment, for example, the connecting part includes a strip segment and an arc segment.

[0067] In some embodiments, optionally, at least two fixing protrusions are provided between any two adjacent connecting parts.

[0068] In this embodiment, a mating structure of a plurality of connecting portions and a plurality of fixing protrusions is defined, such that at least two fixing protrusions are provided between any two adjacent connecting portions. For example, three fixing protrusions are provided between any two adjacent connecting portions, or four fixing protrusions are provided between any two adjacent connecting portions, and so on, which will not be enumerated one by one here.

[0069] This setting can not only ensure the structural strength of the rotor punching sheet, but also reduce the number of connecting portions, which is beneficial to reducing the cost of the rotor punching sheet.

[0070] 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 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.

[0071] 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, therefore, it has all the beneficial effects of the above-mentioned rotor punching sheet, which will not be elaborated one by one here.

[0072] In some embodiments, optionally, in the rotor punching sheet, the part of the isolation groove located 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 is arranged opposite to the sub-groove of the second rotor punching sheet.

[0073] In this embodiment, in the rotor punching sheet, the part of the isolation groove located between two adjacent connecting portions is a sub-groove.

[0074] 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 portion of the second rotor punching sheet, and the connecting portion 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 the end leakage magnetic field and making the overall magnetic field line distribution more uniform.

[0075] In some embodiments, optionally, 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.

[0076] In this embodiment, that is, a mating structure of a plurality of first rotor punching sheets and a plurality of second rotor punching sheets is defined.

[0077] It can be understood that by rotating at least one of the plurality of rotor laminations, the plurality of rotor laminations are divided into a plurality of first rotor laminations and a plurality of second rotor laminations according to the placement position, so as to ensure the usage requirement that the connecting portion of the first rotor lamination and the sub-slot of the second rotor lamination are oppositely arranged.

[0078] Optionally, at least one second rotor lamination is stacked between two adjacent first rotor laminations.

[0079] Optionally, at least one first rotor lamination is stacked between two adjacent second rotor laminations.

[0080] In some other embodiments, the number of both the first rotor lamination and the second rotor lamination is one.

[0081] A third aspect of the present invention provides a motor, comprising: a rotor as in the first aspect.

[0082] 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, which will not be elaborated one by one herein.

[0083] A fourth aspect of the present invention provides a chassis system, comprising: a rotor as in the second aspect; or a motor as in the third aspect.

[0084] 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, which will not be elaborated one by one herein.

[0085] A fifth aspect of the present invention provides a vehicle, comprising: a rotor as in the second aspect; or a motor as in the third aspect; or a chassis system as in the fourth aspect.

[0086] The vehicle provided by the present invention includes the rotor as in the second aspect, or the motor as in the third aspect, or the chassis system as in the fourth aspect, and thus has all the beneficial effects of one of the above rotor, motor and chassis system, which will not be elaborated one by one herein.

[0087] 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.

[0088] 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

[0089] 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, wherein:

[0090] Figure 1 Shows a schematic structural diagram of a rotor punching sheet according to an embodiment of the present application;

[0091] Figure 2 Shows a schematic diagram of dimension markings of a rotor punching sheet according to an embodiment of the present application;

[0092] Figure 3 Shows a partial schematic structural diagram of a punching sheet body according to the first embodiment of the present application;

[0093] Figure 4 Shows a partial schematic structural diagram of a punching sheet body according to the second embodiment of the present application;

[0094] Figure 5 Shows a partial schematic structural diagram of a punching sheet body according to the third embodiment of the present application;

[0095] Figure 6 Shows a partial schematic structural diagram of a rotor core according to an embodiment of the present application;

[0096] Figure 7 Shows a data curve graph of the output torque and product cost of the motor of the present application.

[0097] Among them, Figures 1 to 6 The corresponding relationship between the reference numerals and the component names in is:

[0098] 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 Inner peripheral wall of the ring part, 414 Outer peripheral wall of the ring part, 420 Isolation groove, 430 Fixed protrusion, 440 Connection part, 500 Outer magnetic bridge, 600 Outer peripheral wall of the punching sheet body, 700 Sub-groove, 8 Rotor, 800 Rotor core, 900 Permanent magnet, 1000 Slot. Detailed implementation manners

[0099] In order to be able to more clearly understand the above-mentioned 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.

[0100] Many specific details are set forth in the following description in order to fully understand the present application. However, the present application may also 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.

[0101] The following refers to Figures 1 to 7Rotor punching sheet 1, rotor 8, motor, chassis system and vehicle according to some embodiments of the present application.

[0102] As Figure 1 shown, a rotor punching sheet 1 according to some embodiments of the present application, for a motor, the rotor punching sheet 1 includes a punching sheet body 10.

[0103] The punching sheet body 10 is provided with a mounting hole 100 and a plurality of mounting grooves 200.

[0104] The plurality of mounting grooves 200 are arranged at intervals around the mounting hole 100.

[0105] The part of the punching sheet body 10 between two adjacent mounting grooves 200 is a pole part 300.

[0106] The part of the punching sheet body 10 between the mounting hole 100 and the mounting grooves 200 is an inner magnetic bridge 400.

[0107] The part of the punching sheet body 10 between the mounting grooves 200 and the outer peripheral wall 600 of the punching sheet body is an outer magnetic bridge 500.

[0108] The inner magnetic bridge 400 includes an annular part 410, a plurality of fixing protrusions 430 and a plurality of connecting parts 440.

[0109] The inner peripheral wall 412 of the annular part surrounds the mounting hole 100.

[0110] The outer peripheral wall 414 of the annular part is arranged at intervals from the pole part 300 to enclose an isolation groove 420.

[0111] The mounting groove 200 communicates with the isolation groove 420.

[0112] The plurality of fixing protrusions 430 are all connected to the outer peripheral wall 414 of the annular part, and each mounting groove 200 is arranged opposite to at least one fixing protrusion 430.

[0113] Each connecting part 440 is connected between the outer peripheral wall 414 of the annular part and the pole part 300, and the plurality of connecting parts 440 and the plurality of fixing protrusions 430 are arranged staggeredly.

[0114] The width of the fixing protrusion 430 in the circumferential direction of the rotor punching sheet 1 is denoted as w 1 .

[0115] The length of the fixing protrusion 430 in the direction from the mounting hole 100 to the outer peripheral wall 600 of the punching sheet body is denoted as b 1 .

[0116] The number of the fixing protrusions 430 is denoted as m 1 .

[0117] The width of the connecting part 440 in the circumferential direction of the rotor punching sheet 1 is denoted as w 2。

[0118] The length of the connecting portion 440 in the direction from the mounting hole 100 to the outer peripheral wall 600 of the punching sheet body is denoted as b 2 。

[0119] The number of the connecting portions 440 is denoted as m 2 。

[0120] The distance from the center of the mounting hole 100 to the outer peripheral wall 600 of the punching sheet body is denoted as R 1 。

[0121] The depth of the mounting groove 200 in the direction from the mounting hole 100 to the outer peripheral wall 600 of the punching sheet body is denoted as W m 。

[0122] The distance from the center of the mounting hole 100 to the outer peripheral wall 414 of the annular portion is denoted as R 2 。

[0123] Wherein, w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 <π×((R 1 -W m ) 2 -R 2 2 )。

[0124] In this embodiment, a rotor punching sheet 1 provided by the present application includes a punching sheet body 10

[0125] The punching sheet body 10 is provided with a mounting hole 100 and a plurality of mounting grooves 200, and 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 600 of the punching sheet body (as Figure 1 shown, the dotted line represents the permanent magnet 900).

[0126] The portion of the punching sheet body 10 between two adjacent mounting grooves 200 is a pole portion 300, the portion of the punching sheet body 10 between the mounting hole 100 and the mounting groove 200 is an inner magnetic bridge 400, and the portion of the punching sheet body 10 between the mounting groove 200 and the outer peripheral wall 600 of the punching sheet body is an outer magnetic bridge 500

[0127] The inner magnetic bridge 400 includes an annular portion 410, a plurality of fixing protrusions 430 and a plurality of connecting portions 440

[0128] Among them, the annular portion 410 has an inner peripheral wall and an outer peripheral wall. The inner peripheral wall 412 of the annular portion defines an installation hole 100. The installation holes 100 of the plurality of rotor laminations 1 penetrate along the axial direction of the rotor 8 to form a shaft hole, and the rotating shaft of the motor is inserted into the shaft hole.

[0129] A plurality of fixing protrusions 430 are all connected to the outer peripheral wall 414 of the annular portion. Any one of the plurality of fixing protrusions 430 is connected to the outer peripheral wall 414 of the annular portion. Each installation groove 200 is disposed opposite to at least one fixing protrusion 430. That is to say, each installation groove 200 cooperates with at least one fixing protrusion 430. The fixing protrusion 430 has the function of supporting and fixing the permanent magnet 900 in the installation groove 200. In this way, the matching dimensions of the permanent magnet 900, the lamination body 10 and the rotating shaft can be ensured, providing a reliable structural support for the effectiveness and feasibility of the motor operation.

[0130] Any one of the plurality of connecting portions 440 is connected between the outer peripheral wall 414 of the annular portion and the pole portion 300. That is, the first end of the connecting portion 440 is connected to the outer peripheral wall 414 of the annular portion, and the second end of the connecting portion 440 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 440, and the matching dimensions of the rotating shaft, the lamination body 10 and the permanent magnet 900 can be ensured.

[0131] Compared with the related art in which the inner magnetic bridge is removed and the rotor lamination is formed by injection molding, this setting can improve the structural strength of the rotor lamination 1, reduce the occurrence probability of deformation of the rotor lamination 1, and ensure the stability and reliability of the motor operation.

[0132] Optionally, the lamination body 10 is integrally formed with an inner magnetic bridge 400. Since this structural setting omits the assembly process of the inner magnetic bridge 400, the forming process of the lamination body 10 is simplified, which is beneficial to improving the processing efficiency of the product. And the structural strength of the rotor lamination 1 can be ensured.

[0133] Furthermore, the matching structures of the fixing protrusion 430, the connecting portion 440, the installation hole 100 and the installation groove 200 are defined. Among them, the width of the fixing protrusion 430 in the circumferential direction of the rotor lamination 1 is w 1 , the length of the fixing protrusion 430 in the direction from the installation hole 100 to the outer peripheral wall 600 of the lamination body is b 1 , the number of the fixing protrusions 430 is m 1 , the width of the connecting portion 440 in the circumferential direction of the rotor lamination 1 is w 2 , the length of the connecting portion 440 in the direction from the installation hole 100 to the outer peripheral wall 600 of the lamination body is b 2 , the number of the connecting portions 440 is m 2The distance from the center of the mounting hole 100 to the outer peripheral wall 600 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 600 of the punch body is W m The distance from the center of the mounting hole 100 to the outer peripheral wall 414 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 sheet 1, the area of ​​the inner magnetic bridge 400 can be reduced), and on the basis of ensuring the effective assembly of the rotating shaft and the permanent magnet 900, the structural strength of the rotor sheet 1 can also be ensured, and the probability of deformation of the rotor sheet 1 can be reduced. Compared with the related art in which the rotor core is formed by injection molding, the matching dimensions of the rotor sheet 1, the permanent magnet 900 and the rotating shaft can be guaranteed, 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, and more specifically, optimizes the matching dimensions of the inner magnetic bridge 400 and the permanent magnet 900, so that it can play a role in the reasonable layout of the magnetic lines of force, which is conducive to reducing leakage magnetic field, achieving the effect of improving torque density and suppressing torque pulsation. In other words, this setting takes into account the production cost, structural strength and performance of the product, which is conducive to improving the market competitiveness of the product.

[0134] In some other embodiments, the punch body 10 is provided with a clamping portion, and the clamping portion is used to fix the permanent magnet 900 .

[0135] Optionally, the fixing protrusion 430 extends from the outer peripheral wall 414 of the annular portion toward the mounting groove 200 .

[0136] Optionally, the fixing protrusion 430 is located between the outer peripheral wall 414 of the annular portion and the mounting groove 200 .

[0137] Optionally, a portion of the fixing protrusion 430 extends into the mounting groove 200 .

[0138] It can be understood that the mounting groove 200 is connected to the isolation groove 420, for example, the notch of the mounting groove 200 is connected to the isolation groove 420, and the fixing protrusion 430 and the connecting portion 440 are both located at the isolation groove 420. In this way, it can be ensured that the fixing protrusion 430 has the function of fixing the permanent magnet 900, and can also meet the use requirement of the connecting portion 440 being connected between the annular portion 410 and the pole portion 300.

[0139] It is understandable that the multiple connecting parts 440 and the multiple fixing protrusions 430 are staggered, for example, the multiple connecting parts 440 are arranged at intervals around the mounting hole 100, and the multiple fixing protrusions 430 are arranged at intervals around the mounting hole 100, and at least one fixing protrusion 430 is provided between any two adjacent connecting parts 440.

[0140] In some embodiments, 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.

[0141] In this embodiment, the matching structure of the mounting hole 100, the mounting groove 200 and the inner magnetic bridge 400 is further defined so that 1 , b 1 、m 1 、w 2 , b 2 、m 2 , R 1 , W m and R 2 The relationship satisfies: 0<(w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 ) / (π×((R 1 -W m ) 2 -R 2 2)) ≤ 0.5. In this way, the structure of the inner magnetic bridge 400 is further optimized, thereby further optimizing the production cost, structural strength, and service performance of the product, which is conducive to enhancing the market competitiveness of the product.

[0142] Optionally, (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m ) 2 - R 2 2 )) = 0.4, (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m ) 2 - R 2 2 )) = 0.3, (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m ) 2 - R 2 2 )) = 0.2, etc., which are not listed one by one here.

[0143] In some embodiments, 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.

[0144] In this embodiment, the mating structure of the mounting hole 100, the mounting groove 200 and the inner magnetic bridge 400 is further defined, such that 1 , b 1 , m 1 , w 2 , b 2 , m 2 , R 1 , W m and R 2 satisfy the relationship: 0 < (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m )) 2 - R 2 2 )) ≤ 0.3. In this way, the structure of the inner magnetic bridge 400 is further optimized, and further, the production cost, the structural strength and the service performance of the product are optimized, which is beneficial to enhancing the market competitiveness of the product.

[0145] Optionally, (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m )) 2 - R 2 2 )) = 0.25, (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m )) 2 - R 2 2 )) = 0.21, (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) / (π × ((R 1 - W m )) 2 - R 2 2 )) = 0.15, etc., which are not listed one by one here.

[0146] In some embodiments, optionally, as Figure 1 and Figure 6 shown, the width of the installation groove 200 in the circumferential direction of the rotor punching sheet 1 is denoted as L m .

[0147] The thickness of the punching sheet body 10 is denoted as d.

[0148] Wherein, d ≤ w 1 ≤ 0.75×L m , 0 < b 1 ≤ R 1 -R 2 -(2×W m ) / 3.

[0149] In this embodiment, the mating structure of the punching sheet body 10 is further defined such that the width of the installation groove 200 in the circumferential direction of the rotor punching sheet 1 is L m , the thickness of the punching sheet body 10 is denoted as d, L m and the relationship between d satisfies: d ≤ w 1 ≤ 0.75×L m , 0 < b 1 ≤ R 1 -R 2 -(2×W m ) / 3.

[0150] Wherein, d ≤ w 1 ≤ 0.75×L m , that is, the relationship between the thicknesses of the installation groove 200, the fixing protrusion 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 mating 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.

[0151] 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 mating dimensions of the rotor punching sheet 1 and the permanent magnet 900 cannot be ensured.

[0152] If w 1 is greater than 0.75×L m , then the size of the fixing protrusion 430 is large, which will increase the mating dimension between the fixing protrusion 430 and the permanent magnet 900. In this way, it will increase magnetic leakage, reduce the torque density, and increase torque ripple.

[0153] Optionally, w 1 = 0.72×L m , w 1 = 0.7×Lm , w 1 = 0.68 × L m and so on. Details are not listed here one by one.

[0154] Among them, 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 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.

[0155] If b 1 is greater than R 1 -R 2 -(2 × W m ) / 3, then the size of the fixing protrusion 430 is relatively large, which will increase the matching dimension between the fixing protrusion 430 and the permanent magnet 900. In this way, it will increase the magnetic leakage, reduce the torque density, and increase the torque ripple.

[0156] In some embodiments, optionally, as Figure 1 shown, the circumferential width of the installation groove 200 is denoted as L m , the thickness of the punching sheet body 10 is denoted as d, among which, d ≤ w 2 ≤ 0.75 × L m , 0 < b 2 ≤ R 1 -R 2 -W m .

[0157] In this embodiment, the structure of the punching sheet body 10 is further defined, so that the circumferential width of the installation groove 200 is L m , the thickness of the punching sheet body 10 is d, and the relationship between L m and d satisfies: d ≤ w 2 ≤ 0.75 × L m , 0 < b 2 ≤ R 1 -R 2 -W m .

[0158] Among them, d ≤ w 2 ≤ 0.75 × L m , that is, the relationship between the thicknesses of the installation groove 200, the connecting portion 440 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 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.

[0159] 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 mating dimensions of the rotor punching sheet 1 and the permanent magnet 900 cannot be guaranteed.

[0160] If w 2 is greater than 0.75×L m , then the size of the connecting portion 440 is large. In this way, the magnetic leakage will increase, the torque density will decrease, and the torque ripple will increase.

[0161] 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.

[0162] Wherein, 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 mating 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.

[0163] If b 2 is greater than R 1 -R 2 -W m , then the size of the connecting portion 440 is 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.

[0164] In some embodiments, optionally, as Figure 1 shown, the distance from the inner peripheral wall 412 to the outer peripheral wall of the annular portion is denoted as H 1 .

[0165] The distance from the center of the mounting hole 100 to the inner peripheral wall 412 of the annular portion is denoted as R 0 .

[0166] Wherein, H 1 ×(H 1 +2×R 0 ) < R 1 2 -R 0 2 .

[0167] In this embodiment, the structure of the punching sheet body 10 is further defined such that the distance from the inner peripheral wall 412 to the outer peripheral wall of the annular portion is H 1 , and the distance from the center of the mounting hole 100 to the inner peripheral wall 412 of the annular portion is R 0 . Among them, H 1 , R 0 and R 1 satisfy the relationship: H 1 × (H 1 + 2 × R 0 ) < R 1 2 - R 0 2 .

[0168] The mating structure of the mounting hole 100, the outer peripheral wall 600 of the punching sheet body, and the inner magnetic bridge 400 is further defined. That is, the structure of the inner magnetic bridge 400 is further 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 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. More specifically, the mating dimensions of the inner magnetic bridge 400 and the permanent magnet 900 are optimized. 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.

[0169] 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.

[0170] 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。

[0171] In some embodiments, optionally, H 1 , R 0 and R 1 satisfy: 0 < H 1 / (R 1 -R 0 ) ≤ 0.45。

[0172] 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 412 to the outer peripheral wall of the annular portion, the distance from the center of the mounting hole 100 to the inner peripheral wall 412 of the annular portion, and the distance from the center of the mounting hole 100 to the outer peripheral wall 600 of the punching sheet body is defined.

[0173] When the above limitations are met, it has the effect of reducing magnetic leakage, increasing torque density, and suppressing torque ripple.

[0174] 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.

[0175] 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.

[0176] In some embodiments, optionally, the thickness of the punching sheet body 10 is denoted as d, where H 1 ≥ d.

[0177] 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 H 1 and d satisfy the relationship: H 1 ≥d.

[0178] 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 matching dimensions of the rotor punching sheet 1, the permanent magnet 900, and the rotating shaft.

[0179] If H 1 is less than d, then the structural strength of the product is low, and the rotor punching sheet 1 is prone to deformation, which will reduce the structural strength of the rotor punching sheet 1.

[0180] Optionally, H 1 = 1.2×d, H 1 = 1.5×d, H 1 = 1.8×d, and H 1 = 2×d, etc., which will not be listed one by one here.

[0181] In some embodiments, optionally, as Figure 1 and Figure 2 shown, the distance from the part of the outer peripheral wall 600 of the punching sheet body opposite to the pole part 300 to the center of the mounting hole 100 is denoted as R 11 .

[0182] The distance from the part of the outer peripheral wall 600 of the punching sheet body opposite to the mounting groove 200 to the center of the mounting hole 100 is denoted as R 22 .

[0183] The distance from the center of the mounting hole 100 to the pole part 300 is denoted as R 3 .

[0184] The width of the mounting groove 200 in the circumferential direction of the punching sheet body 10 is denoted as L m .

[0185] The distance from the mounting groove 200 to the outer peripheral wall 600 of the punching sheet body is denoted as h.

[0186] The number of pole pairs of the motor is denoted as p.

[0187] Among them, 4×p×L m ×h < π×(R 11 + R 22 + 2×R 3 )×W m .

[0188] In this embodiment, the structure of the punching sheet body 10 is further defined such that the distance from the portion of the outer peripheral wall 600 of the punching sheet body opposite to the pole portion 300 to the center of the mounting hole 100 is R 11 , the distance from the portion of the outer peripheral wall 600 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 portion 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 peripheral wall 600 of the punching sheet body is h. 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 m . That is to say, the structure of the outer magnetic bridge 500 is optimized (for example, while ensuring the structural strength of the rotor punching sheet 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 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 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 outer magnetic bridge 500, so that 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.

[0189] Optionally, R 11 , R 22 , R 3 , L m , h and p satisfy: 0 < (4×p×L m ×h) / (π×(R 11 + R 22 + 2×R 3 )×W m ) < 0.2.

[0190] Optionally, R 11 , R 22 , R 3 , L m , h and p satisfy: 0 < (4×p×L m ×h) / (π×(R 11+R 22 +2×R 3 )×W m )<0.08。

[0191] In some embodiments, optionally, m 1 and p satisfy: m 1 = 2×p.

[0192] m 2 and p satisfy: m 2 = p, or m 2 = 2×p.

[0193] Wherein, p is the number of pole pairs of the motor.

[0194] In this embodiment, the relationship between m 1 , m 2 and p is further defined. Such 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.

[0195] Wherein, m 1 = 2×p, in this way, each fixing protrusion 430 is matched with an installation groove 200, more specifically, each fixing protrusion 430 is used to limit a permanent magnet 900.

[0196] Wherein, m 2 = p, or m 2 = 2×p, that is, the relationship between the number of connecting portions 440 and the number of pole pairs of the motor is defined.

[0197] Optionally, at least one fixing protrusion 430 is provided between two adjacent connecting portions 440.

[0198] In some embodiments, optionally, as Figure 3 , Figure 4 and Figure 5 shown, the fixing protrusion 430 includes at least one of a strip segment and an arc segment.

[0199] and / or the connecting portion 440 includes at least one of a strip segment and an arc segment.

[0200] In this embodiment, the shapes of the fixing protrusion 430 and the connecting portion 440 are further defined.

[0201] Wherein, the fixing protrusion 430 includes a strip segment and / or an arc segment, for example, the fixing protrusion 430 includes a strip segment, for example, the fixing protrusion 430 includes an arc segment, for example, the fixing protrusion 430 includes a strip segment and an arc segment.

[0202] The connecting part 440 includes at least one of a strip segment and an arc segment. For example, the connecting part 440 includes a strip segment, for example, the connecting part 440 includes an arc segment, for example, the connecting part 440 includes a strip segment and an arc segment.

[0203] In some embodiments, optionally, at least two fixing protrusions 430 are provided between any two adjacent connecting parts 440.

[0204] In this embodiment, the cooperation structure of the plurality of connecting parts 440 and the plurality of fixing protrusions 430 is defined such that at least two fixing protrusions 430 are provided between any two adjacent connecting parts 440. For example, three fixing protrusions 430 are provided between any two adjacent connecting parts 440, for example, four fixing protrusions 430 are provided between any two adjacent connecting parts 440, and so on, which are not listed one by one here.

[0205] This setting can not only ensure the structural strength of the rotor punching sheet 1, but also reduce the number of connecting parts 440, which is beneficial to reducing the cost of the rotor punching sheet 1.

[0206] In some other embodiments, one fixing protrusion 430 is provided between any two adjacent connecting parts 440.

[0207] A rotor 8 according to another embodiment of the present application includes a rotor core 800 and a plurality of permanent magnets 900.

[0208] The rotor core 800 is formed by stacking a plurality of rotor punching sheets 1 as described in any of the above embodiments.

[0209] The installation grooves 200 of the plurality of rotor punching sheets 1 penetrate along the axial direction of the rotor core 800 to form a slot 1000.

[0210] For the plurality of permanent magnets 900, one permanent magnet 900 is provided in each slot 1000.

[0211] In this embodiment, the rotor 8 includes a rotor core 800 and a plurality of permanent magnets 900.

[0212] The rotor core 800 is formed by stacking a plurality of rotor punching sheets 1.

[0213] A rotor punching sheet 1 provided by the present application includes a punching sheet body 10.

[0214] The punching sheet body 10 is provided with an installation hole 100 and a plurality of installation grooves 200. The plurality of installation grooves 200 are arranged at intervals around the installation hole 100. The installation grooves 200 are used for installing the permanent magnets 900. The installation grooves 200 are arranged at intervals from the installation hole 100, and the installation grooves 200 are arranged at intervals from the outer peripheral wall 600 of the punching sheet body (such as Figure 1As shown, the dashed line represents the permanent magnet 900).

[0215] The part of the punching sheet body 10 between two adjacent mounting grooves 200 is the pole part 300. The part of the punching sheet body 10 between the mounting hole 100 and the mounting groove 200 is the inner magnetic bridge 400. The part of the punching sheet body 10 between the mounting groove 200 and the outer peripheral wall 600 of the punching sheet body is the outer magnetic bridge 500.

[0216] The inner magnetic bridge 400 includes an annular part 410, a plurality of fixing protrusions 430, and a plurality of connecting parts 440.

[0217] Among them, the annular part 410 has an inner peripheral wall and an outer peripheral wall. The inner peripheral wall 412 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 a shaft hole, and the rotating shaft of the motor is inserted into the shaft hole.

[0218] A plurality of fixing protrusions 430 are all connected to the outer peripheral wall 414 of the annular part. Any one of the plurality of fixing protrusions 430 is connected to the outer peripheral wall 414 of the annular part. Each mounting groove 200 is disposed opposite to at least one fixing protrusion 430. That is to say, each mounting groove 200 cooperates with at least one fixing protrusion 430. The fixing protrusion 430 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.

[0219] Any one of the plurality of connecting parts 440 is connected between the outer peripheral wall 414 of the annular part and the pole part 300. That is, the first end of the connecting part 440 is connected to the outer peripheral wall 414 of the annular part, and the second end of the connecting part 440 is connected to the pole part 300. It can also be said that the annular part 410 and the pole part 300 are assembled together through a plurality of connecting parts 440, which can guarantee the matching dimensions of the rotating shaft, the punching sheet body 10, and the permanent magnet 900.

[0220] Compared with the related technology 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 1, reduce the occurrence probability of deformation of the rotor punching sheet 1, and ensure the stability and reliability of the motor operation.

[0221] Optionally, the punching sheet body 10 is integrally formed with the 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 guaranteed.

[0222] Furthermore, the mating structure of the fixing protrusion 430, the connecting portion 440, the mounting hole 100, and the mounting groove 200 is defined. Among them, the width of the fixing protrusion 430 in the circumferential direction of the rotor punching sheet 1 is w 1 , the length of the fixing protrusion 430 in the direction from the mounting hole 100 to the outer peripheral wall 600 of the punching sheet body is b 1 , the number of the fixing protrusions 430 is m 1 , the width of the connecting portion 440 in the circumferential direction of the rotor punching sheet 1 is w 2 , the length of the connecting portion 440 in the direction from the mounting hole 100 to the outer peripheral wall 600 of the punching sheet body is b 2 , the number of the connecting portions 440 is m 2 , the distance from the center of the mounting hole 100 to the outer peripheral wall 600 of the punching sheet body is R 1 , the depth of the mounting groove 200 in the direction from the mounting hole 100 to the outer peripheral wall 600 of the punching sheet body is W m , the distance from the center of the mounting hole 100 to the outer peripheral wall 414 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 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 technology of forming the rotor core 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. More specifically, the mating dimensions of the inner magnetic bridge 400 and the permanent magnet 900 are optimized. In this way, the magnetic force lines can be reasonably arranged, which is beneficial to reducing magnetic leakage and achieving the effects 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.

[0223] In some embodiments, optionally, as Figure 6 shown, in the rotor punching sheet 1, the part of the isolation groove 420 between two adjacent connecting parts 440 is the sub-groove 700.

[0224] The multiple rotor punching sheets 1 include a first rotor punching sheet 1a and a second rotor punching sheet 1b.

[0225] The sub-groove 700 of the first rotor punching sheet 1a is disposed opposite to the connecting part 440 of the second rotor punching sheet 1b.

[0226] The connecting part 440 of the first rotor punching sheet 1a and the sub-groove 700 of the second rotor punching sheet 1b are disposed opposite to each other.

[0227] In this embodiment, in the rotor punching sheet 1, the part of the isolation groove 420 between two adjacent connecting parts 440 is the sub-groove 700.

[0228] And classify the types of the multiple rotor punching sheets 1. 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 700 of the first rotor punching sheet 1a is disposed opposite to the connecting part 440 of the second rotor punching sheet 1b, and the connecting part 440 of the first rotor punching sheet 1a and the sub-groove 700 of the second rotor punching sheet 1b are disposed opposite to each other. This setting is beneficial to eliminating the end leakage magnetic flux and making the overall magnetic field line distribution more uniform.

[0229] 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 arranged between any two adjacent first rotor punching sheets 1a. Or, at least one first rotor punching sheet 1a is arranged between any two adjacent second rotor punching sheets 1b.

[0230] A motor according to some other embodiments of the present application includes the rotor 8 in any of the above embodiments.

[0231] In this embodiment, the motor includes a rotor 8.

[0232] The rotor 8 includes a rotor core 800 and multiple permanent magnets 900.

[0233] The rotor core 800 is formed by stacking multiple rotor punching sheets 1.

[0234] A rotor punching sheet 1 provided by the present application includes a punching sheet body 10.

[0235] The punching sheet body 10 is provided with a mounting hole 100 and multiple mounting grooves 200. The multiple 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 with respect to the mounting hole 100, and the mounting grooves 200 are arranged at intervals with respect to the outer peripheral wall 600 of the punching sheet body (asFigure 1 As shown, the dashed line represents the permanent magnet 900).

[0236] The part of the punching sheet body 10 between two adjacent mounting grooves 200 is the pole part 300, the part of the punching sheet body 10 between the mounting hole 100 and the mounting groove 200 is the inner magnetic bridge 400, and the part of the punching sheet body 10 between the mounting groove 200 and the outer peripheral wall 600 of the punching sheet body is the outer magnetic bridge 500.

[0237] The inner magnetic bridge 400 includes an annular part 410, a plurality of fixing protrusions 430 and a plurality of connecting parts 440.

[0238] Among them, the annular part 410 has an inner peripheral wall and an outer peripheral wall. The inner peripheral wall 412 of the annular part encloses the mounting hole 100. The mounting holes 100 of the plurality of rotor punching sheets 1 penetrate along the axial direction of the rotor 8 to form a shaft hole, and the rotating shaft of the motor is inserted into the shaft hole.

[0239] The plurality of fixing protrusions 430 are all connected to the outer peripheral wall 414 of the annular part. Any one of the plurality of fixing protrusions 430 is connected to the outer peripheral wall 414 of the annular part, and each mounting groove 200 is disposed opposite to at least one fixing protrusion 430. That is to say, each mounting groove 200 cooperates with at least one fixing protrusion 430. The fixing protrusion 430 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.

[0240] Any one of the plurality of connecting parts 440 is connected between the outer peripheral wall 414 of the annular part and the pole part 300. That is, the first end of the connecting part 440 is connected to the outer peripheral wall 414 of the annular part, and the second end of the connecting part 440 is connected to the pole part 300. It can also be said that the annular part 410 and the pole part 300 are assembled together through the plurality of connecting parts 440, and the matching dimensions of the rotating shaft, the punching sheet body 10 and the permanent magnet 900 can be ensured.

[0241] Compared with the related technology 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 1, reduce the occurrence probability of deformation of the rotor punching sheet 1, and ensure the stability and reliability of the motor operation.

[0242] Optionally, the punching sheet body 10 is integrally formed with the 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.

[0243] Furthermore, the mating structure of the fixing protrusion 430, the connecting portion 440, the mounting hole 100, and the mounting groove 200 is defined. Among them, the width of the fixing protrusion 430 in the circumferential direction of the rotor punching 1 is w 1 , the length of the fixing protrusion 430 in the direction from the mounting hole 100 to the outer peripheral wall 600 of the punching body is b 1 , the number of the fixing protrusions 430 is m 1 , the width of the connecting portion 440 in the circumferential direction of the rotor punching 1 is w 2 , the length of the connecting portion 440 in the direction from the mounting hole 100 to the outer peripheral wall 600 of the punching body is b 2 , the number of the connecting portions 440 is m 2 , the distance from the center of the mounting hole 100 to the outer peripheral wall 600 of the punching body is R 1 , the depth of the mounting groove 200 in the direction from the mounting hole 100 to the outer peripheral wall 600 of the punching body is W m , the distance from the center of the mounting hole 100 to the outer peripheral wall 414 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 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 related technology of forming the rotor core by injection molding, the mating 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, this structural setting optimizes the structure of the inner magnetic bridge 400. More specifically, the mating dimensions of the inner magnetic bridge 400 and the permanent magnet 900 are optimized. In this way, the magnetic field lines can be reasonably arranged, 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.

[0244] A chassis system according to some further embodiments of the present application includes: a rotor 8 as in the above embodiments; or a motor as in the above embodiments.

[0245] In this embodiment, the chassis system includes the rotor 8 or the motor. Therefore, it has all the beneficial effects of the above rotor 8 or motor, which will not be elaborated one by one here.

[0246] Optionally, the chassis system includes a powertrain system, a running gear 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 vehicle engine and the assemblies of 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.

[0247] A vehicle according to some further 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.

[0248] In this embodiment, the vehicle includes the rotor 8 or the motor or the chassis system. Therefore, it has all the beneficial effects of one of the above rotor 8, motor, and chassis system, which will not be elaborated one by one here.

[0249] 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, and the plurality of mounting grooves 200 are circumferentially distributed along 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 600 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. An isolation groove 420 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 fixing protrusion 430, and a connecting part 440. The circumferential maximum width of the fixing protrusion 430 is denoted as w 1 , the radial length of the fixing protrusion 430 is denoted as b1, the circumferential maximum width of the connecting part 440 is denoted as w2, and the radial length of the connecting part 440 is denoted as b2, where 0 < (w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 ) / (π×((R 1 -W m )) ≤ 0.5, where m 2 -R 2 2 )) ≤ 0.5, where m 1The number of the fixing protrusions 430 is m 2 The number of the connecting parts 440 is R 1 It refers to the distance between the outer edge of the punching sheet body 10 and the center of the mounting hole 100. The distance from the joint of the annular part 410 and the isolation groove 420 to the center of the mounting hole 100 is denoted as R 2 , W m is the radial length of the mounting groove 200. The rotor punching sheet 1 provided by this application effectively improves the torque density and suppresses the torque ripple

[0250] 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 )

[0251] / (π×((R 1 -W m )) 2 -R 2 2 ) ≤ 0.3

[0252] w 1 and b 1 satisfy d ≤ w 1 ≤ 0.75×L m , 0 < b 1 ≤ R 1 -R 2 -(2×W m ) / 3, L m is the circumferential maximum width of the mounting groove 200, and d is the thickness of the punching sheet body 10

[0253] w2 and b2 satisfy d ≤ w 2 ≤ 0.75×L m , 0 < b 2 ≤ R 1 -R 2 -W m .

[0254] The number m of the fixing protrusions 430 1 = 2×p, where p is the number of pole pairs of the motor

[0255] The number m of the connecting parts 440 2 = p or m2 = 2p, where p is the number of pole pairs of the motor.

[0256] The fixing protrusion 430 includes at least one of a strip segment and an arc segment.

[0257] The connecting portion 440 includes at least one of a strip segment and an arc segment.

[0258] The rotor core 800 includes: a plurality of rotor punching sheets 1, which are stacked along the axis direction of the punching sheet body 10. The mounting holes 100 of the plurality of rotor punching sheets 1 communicate with each other to form a shaft hole, and the mounting grooves 200 of the plurality of rotor punching sheets 1 communicate with each other correspondingly to form a slot 1000; a plurality of permanent magnets 900, which are respectively accommodated in the plurality of slots 1000.

[0259] The plurality of rotor punching sheets 1 are stacked in a rotary manner. For example, in the rotor punching sheet 1, the part of the isolation groove 420 located between two adjacent connecting portions 440 is a sub-groove 700; the plurality of rotor punching sheets 1 include a first rotor punching sheet 1a and a second rotor punching sheet 1b, the sub-groove 700 of the first rotor punching sheet 1a is disposed opposite to the connecting portion 440 of the second rotor punching sheet 1b, and the connecting portion 440 of the first rotor punching sheet 1a and the sub-groove 700 of the second rotor punching sheet 1b are disposed opposite to each other.

[0260] The isolation groove 420 is filled with air or a non-magnetic material is filled in the isolation groove 420.

[0261] The (w 1 × b 1 × m 1 + w 2 × b 2 × m 2 ) and (π × ((R 1 - W m )) 2 - R 2 2 ) ratio is denoted as X1. Figure 7 Shows the trends of the output torque of the motor and the cost of the rotor 8 changing with the change of X1.

[0262] Taking a 12-slot 10-pole permanent magnet motor as an example, the number of pole pairs p of the motor = 5. Figure 7 The simulation results of the output torque, torque ripple and the cost of the rotor 8 under different X1 are shown. Among them, Te* and Cost* are per-unit values, Te* is the ratio of the output torque under different X1 to the output torque under the condition of X1 = 0.08, and Cost* is the ratio of the output torque under different X1 to the cost of the rotor 8 under the condition of X1 = 0.08. When 0 < (w 1 × b 1 × m 1 + w 2 × b2 ×m 2 ) / (π×((R 1 -W m )) 2 -R 2 2 )) ≤ 0.5 range, the output torque Te* of the motor > 0.7, Cost* < 1.20. At 0 < (w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 ) / (π×((R 1 -W m )) 2 -R 2 2 )) ≤ 0.3 range, the output torque Te* of the motor > 0.80, Cost* < 1.10, and the cost performance is better.

[0263] In this application, the term "a plurality of" means two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, "connected" 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 circumstances.

[0264] 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 descriptions of the above terms do not necessarily refer to the same embodiment or example. 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 modifications, equivalent replacements, improvements, 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, characterized in that: For a motor, the rotor punching sheet comprises: A punch body, wherein the punch 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, the portion of the punch body located between two adjacent mounting grooves is a pole portion, the portion of the punch body located between the mounting hole and the mounting groove is an inner magnetic bridge, and the portion of the punch body located between the mounting groove and the outer peripheral wall of the punch body is an outer magnetic bridge; The inner magnetic bridge comprises: An annular portion, wherein the inner peripheral wall of the annular portion encloses the mounting hole, the outer peripheral wall of the annular portion is spaced apart from the pole portion to enclose an isolation groove, and the mounting groove is connected to the isolation groove; A plurality of fixing protrusions, each of which is connected to the outer peripheral wall of the annular portion, and each of the mounting grooves is arranged opposite to at least one of the fixing protrusions; A plurality of connecting parts, each of which is connected between the outer peripheral wall of the annular part and the pole part, and the plurality of connecting parts and the plurality of fixing protrusions are arranged in a staggered manner; The width of the fixing protrusion in the circumferential direction of the rotor punch is recorded as w1, the length of the fixing protrusion in the direction from the mounting hole to the outer peripheral wall of the punch body is recorded as b1, the number of the fixing protrusions is recorded as m1, the width of the connecting portion in the circumferential direction of the rotor punch is recorded as w2, the length of the connecting portion in the direction from the mounting hole to the outer peripheral wall of the punch body is recorded as b2, the number of the connecting portions is recorded as m2, the distance from the center of the mounting hole to the outer peripheral wall of the punch body is recorded as R1, and the depth of the mounting groove in the direction from the mounting hole to the outer peripheral wall of the punch body is recorded as W m , the distance from the center of the mounting hole to the outer peripheral wall of the annular portion is recorded as R2; Among them, w1×b1×m1+w2×b2×m2<π×((R1-W m ) 2 -R2 2 ).

2. The rotor punching according to claim 1, characterized in that: w1, b1, m1, w2, b2, m2, R1, W m and R2 satisfies: 0<(w1×b1×m1+w2×b2×m2) / (π×((R1-W m ) 2 -R2 2 ))≤0.

5.

3. The rotor punching according to claim 2, characterized in that: w1, b1, m1, w2, b2, m2, R1, W m and R2 satisfies: 0<(w1×b1×m1+w2×b2×m2) / (π×((R1-W m ) 2 -R2 2 ))≤0.

3.

4. The rotor punching according to any one of claims 1 to 3, characterized in that: The width of the mounting groove in the circumferential direction of the rotor punching is denoted as L. m The thickness of the punch body is denoted as d, where d≤w1≤0.75×L m , 0<b1≤R1-R2-(2×W m ) / 3.

5. The rotor punching according to any one of claims 1 to 3, characterized in that: The circumferential width of the mounting groove is denoted as L m The thickness of the punch body is denoted as d, where d≤w2≤0.75×L m , 0<b2≤R1-R2-W m .

6. The rotor punching according to any one of claims 1 to 3, characterized in that: The distance from the inner circumferential wall to the outer circumferential wall of the annular portion is recorded as H1, and the distance from the center of the mounting hole to the inner circumferential wall of the annular portion is recorded as R0, wherein H1×(H1+2×R0)<R1 2 -R0 2 .

7. The rotor punching according to any one of claims 1 to 3, characterized in that: The distance from the outer peripheral wall of the punch body and the part opposite to the pole to the center of the mounting hole is recorded as R 11 The distance from the portion of the outer wall of the punch 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 is recorded as R3, and the width of the mounting groove in the circumferential direction of the punch body is recorded as L m , the distance from the mounting groove to the outer peripheral wall of the punch body is recorded as h, and the number of pole pairs of the motor is recorded as p, where 4×p×L m ×h<π×(R 11 +R 22 +2×R3)×W m .

8. The rotor punching according to any one of claims 1 to 3, characterized in that: m1 and p satisfy: m1 = 2 × p; m2 and p satisfy: m2 = p, or m2 = 2 × p; Where p is the number of pole pairs of the motor.

9. The rotor punching according to any one of claims 1 to 3, characterized in that: The fixing protrusion comprises 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. The rotor punching according to any one of claims 1 to 3, characterized in that: At least two fixing protrusions are arranged between any two adjacent connecting parts.

11. A rotor, characterized in that: include: A rotor core, wherein the rotor core is formed by stacking a plurality of rotor punchings according to any one of claims 1 to 10, and the mounting grooves of the plurality of rotor punchings penetrate the rotor core in an axial direction to form a slot; A plurality of permanent magnets, one of the permanent magnets is disposed in each of the slots.

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

13. The rotor according to claim 12, characterized in that The number of the first rotor punching sheets and the number of the second rotor punching sheets are both multiple; At least one of the second rotor punchings is stacked between two adjacent first rotor punchings, or at least one of the first rotor punchings is stacked between two adjacent second rotor punchings.

14. A motor, characterized in that: include: A rotor as claimed in any one of claims 11 to 13.

15. A chassis system, characterized in that: include: A rotor as claimed in any one of claims 11 to 13; or The electric machine as claimed in claim 14.

16. A vehicle, characterized in that: include: A rotor as claimed in any one of claims 11 to 13; or The motor as claimed in claim 14; or The chassis system of claim 15.

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