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 distance from the part, opposite to the pole part, of the outer peripheral wall of the punching sheet body to the center of the mounting hole is recorded as R1, the distance from the part, opposite to the mounting groove, of the outer peripheral wall of the punching sheet body to the center of the mounting hole is recorded as R2, the distance from the center of the mounting hole to the pole part is recorded as R3, and the width of the mounting groove in the circumferential direction of the punching sheet body is recorded as Lm, the distance from the mounting groove to the outer peripheral wall of the punching sheet body is recorded as h, the number of pole pairs of the motor is recorded as p, and 4 * p * Lm * h is smaller than pi * (R1 + R2 + 2 * R3) * Wm.

Description

Technical Field

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

[0002] To solve the problems of cogging torque and torque ripple of permanent magnet motors, in the related art, the inner magnetic bridge of the permanent magnet motor is removed, and the rotor core is formed by injection molding. In this way, the production cost of the product will increase, and the strength of the rotor core will be reduced. 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 technologies.

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

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

[0006] A third aspect of the present application provides a 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, a first aspect of the present application provides a rotor punching sheet for a motor, the rotor punching sheet including: a punching sheet body, the punching sheet body being provided with a mounting hole and a plurality of mounting grooves, the plurality of mounting grooves being arranged at intervals around the mounting hole, a part of the punching sheet body between two adjacent mounting grooves being a pole part, a part of the punching sheet body between the mounting hole and the mounting groove being an inner magnetic bridge, and a part of the punching sheet body between the mounting groove and the outer peripheral wall of the punching sheet body being an outer magnetic bridge; the inner magnetic bridge including: an annular part, the annular part being arranged around the mounting hole, an outer peripheral wall of the annular part being spaced from the pole part to enclose an isolation groove, the mounting groove being communicated with the isolation groove; a plurality of fixing protrusions, the plurality of fixing protrusions being connected to the outer peripheral wall of the annular part, each mounting groove being arranged opposite to at least one fixing protrusion; a plurality of connecting parts, each connecting part being connected between the outer peripheral wall of the annular part and the pole part, the plurality of connecting parts and the plurality of fixing protrusions being arranged staggeredly; a distance from a 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 1 , a distance from a 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 2 , a distance from the center of the mounting hole to the pole part is denoted as R 3 , a width of the mounting groove in the circumferential direction of the punching sheet body is denoted as L m , a distance from the mounting groove to the outer peripheral wall of the punching sheet body is denoted as h, a number of pole pairs of the motor is denoted as p, and a 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 Wm , where 4×p×L m ×h < π×(R 1 + R 2 + 2×R 3 )×W m .

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

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

[0012] The part of the punching sheet body between two adjacent installation grooves is the pole part, the part of the punching sheet body between the installation hole and the installation grooves is the inner magnetic bridge, and the part of the punching sheet body between the installation grooves and the outer peripheral wall of the punching sheet body is the 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 installation hole. The installation holes of a plurality of rotor punching sheets penetrate along the axial direction of the rotor to form an axial hole, and the rotating shaft of the motor is inserted into the axial 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 installation groove is arranged opposite to at least one fixing protrusion. That is to say, each installation groove cooperates with at least one fixing protrusion. The fixing protrusion has the function of supporting and fixing the permanent magnet in the installation 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 to say, the first end of the connecting part is connected to the outer peripheral wall of the annular part, and the second end of the connecting part is connected to the pole part. It can also be said that the annular part and the pole part are assembled together through a plurality of connecting parts, which can guarantee the matching dimensions of the rotating shaft, the punching sheet body and the permanent magnet.

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

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

[0019] Further, 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 R 1 , 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 R 2 , the distance from the center of the mounting hole to the pole part is R 3 , the width of the mounting groove in the circumferential direction of the punching sheet body is L m , the distance from the mounting groove to the outer peripheral wall of the punching sheet body is h, the number of pole pairs of the motor is P, and 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 , 4×p×L m ×h<π×(R 1 +R 2 +2×R 3 )×W m . That is to say, the structure of the outer magnetic bridge is optimized (for example, while ensuring the structural strength of the rotor punching sheet, the area of the outer 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 guaranteed, and the probability of deformation of the rotor punching sheet can be reduced. Compared with the related technology of forming the rotor core by injection molding, the matching dimensions of the rotor punching sheet, the permanent magnet 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 outer magnetic bridge, so that it can play a role in reasonably distributing the magnetic force lines, which is beneficial to reducing magnetic leakage, achieving the effect of improving the torque density and suppressing torque ripple. That is to say, this setting takes into account the production cost, structural strength and service performance of the product, which is beneficial to enhancing the market competitiveness of the product.

[0020] It can be understood that the mounting groove communicates with the isolation groove. For example, the notch of the mounting groove communicates with the isolation groove, and both the fixing protrusion and the connecting 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 met.

[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 mounting hole, the multiple fixing protrusions are arranged at intervals around the mounting hole, and at least one fixing protrusion is arranged between any two adjacent connecting parts.

[0022] It can be understood that the lamination body is sectioned along the axis perpendicular to the rotor lamination. In the section, the contour lines of the two side walls of the mounting groove are respectively denoted as the fifth line segment and the sixth line segment, the point on the fifth line segment is denoted as the fifth point, and 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, and the distance from the fifth point to the sixth point is denoted as L. m .

[0023] It can be understood that the lamination body is sectioned along the axis perpendicular to the rotor lamination. In the section, the point on the contour line of the bottom wall of the mounting groove is denoted as the seventh point, and along the center of the mounting hole to the outer peripheral wall of the lamination body, the point on the outer peripheral wall of the lamination body opposite to the seventh point is denoted as the eighth point, and the distance from the seventh point to the eighth point is denoted as h.

[0024] According to the rotor lamination of the present application described above, it may further have the following additional technical features:

[0025] In some embodiments, optionally, R 1 , R 2 , R 3 , L m , h and p satisfy: 0 < (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m ) < 0.2.

[0026] In this embodiment, the structure of the lamination body is further defined such that R 1 , R 2 , R 3 , L m , h and p satisfy: 0 < (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m ) < 0.2. In this way, the structure of the outer magnetic bridge is further optimized, and further, the production cost, structural strength and service performance of the product are optimized, which is beneficial to improving the market competitiveness of the product.

[0027] In some embodiments, optionally, R 1 , R 2 , R 3 , L m , h and p satisfy: 0 < (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m ) < 0.08.

[0028] In this embodiment, the structure of the punching sheet body is further defined such that R 1 , R 2 , R 3 , L m , h and p satisfy the relationship: 0 < (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m ) < 0.08. In this way, the structure of the outer magnetic bridge is further optimized, and further, the production cost, structural strength and service performance of the product are optimized, which is beneficial to enhancing the market competitiveness of the product.

[0029] In some embodiments, optionally, R 1 and R 2 satisfy: 0.85 ≤ R 1 / R 2 ≤ 1.35.

[0030] In this embodiment, the structure of the punching sheet body is further defined such that the relationship between R 1 and R 2 satisfies: 0.85 ≤ R 1 / R 2 ≤ 1.35. In this way, the air-gap magnetic field is adjusted, the magnetic resistance is reduced, which is beneficial to reducing magnetic leakage, achieving the effect of increasing the torque density and suppressing torque ripple.

[0031] If R 1 / R 2 is greater than 1.35, then the gap between the stator and the rotor is too large, the magnetic resistance will increase, and further, the magnetic leakage will increase, and the torque density will decrease.

[0032] If R 1 / R 2 is less than 0.85, then the gap between the stator and the rotor is too large, the magnetic resistance will increase, and further, the magnetic leakage will increase, and the torque density will decrease.

[0033] In some embodiments, optionally, R 1 and R 2 satisfy: 0.96 ≤ R 1 / R 2 ≤ 1.1.

[0034] In this embodiment, the structure of the punching sheet body is further defined such that the relationship between R 1 and R 2 satisfies: 0.96 ≤ R 1 / R 2≤1.1. In this way, the air-gap magnetic field is further adjusted, the magnetic resistance is reduced, which is beneficial to reducing the leakage magnetic field, achieving the effect of improving the torque density and suppressing the torque ripple.

[0035] In some embodiments, optionally, the lamination body is sectioned along the axial direction perpendicular to the rotor lamination. In the section, the contour line of the lamination body includes a plurality of mating edges connected end to end in sequence; the mating edge includes a first curve segment, a second curve segment, a third curve segment, and a fourth curve segment connected in sequence. The fourth curve segment has a first end point and a second end point, and the first end point is connected to the third curve segment; two adjacent pole parts are respectively denoted as a first pole part and a second pole part. The first curve segment, the second curve segment, the third curve segment, and the first end point are all disposed opposite to the first pole part, and the second end point is disposed opposite to the second pole part; the distance from any one of the first curve segment, the second curve segment, and the third curve segment to the center of the mounting hole is greater than the distance from the fourth curve segment to the center of the mounting hole; the connection line between the intersection point of the first curve segment and the second curve segment and the center of the mounting hole is denoted as a first connection line, the connection line between the intersection point of the second curve segment and the third curve segment and the center of the mounting hole is denoted as a second connection line, the connection line between the first end point and the center of the mounting hole is denoted as a third connection line, the connection line between the end point of the first curve segment departing from the second curve segment and the center of the mounting hole is denoted as a fourth connection line, and the included angle between the first connection line and the second connection line is denoted as θ 1 , and the included angle between the third connection line and the fourth connection line is denoted as θ 2 , where 0 < θ 1 < θ 2 < π / p.

[0036] In this embodiment, the structure of the lamination body is further defined. The lamination body is sectioned along the axial direction perpendicular to the rotor lamination. In the section, the contour line of the lamination body includes a plurality of mating edges connected end to end in sequence. The contour line of the lamination body is divided. The contour line of the lamination body includes a plurality of mating edges, and the plurality of mating edges are connected end to end in sequence to form a closed structure.

[0037] Further, the mating edge is divided. Each mating edge includes a first curve segment, a second curve segment, a third curve segment, and a fourth curve segment connected in sequence. That is, the second curve segment is connected between the first curve segment and the third curve segment, and the fourth curve segment is connected to the side of the third curve segment departing from the second curve segment.

[0038] And the setting positions of the mating edge and the pole part are defined. Among them, two adjacent pole parts are respectively denoted as a first pole part and a second pole part. Any one of the first curve segment, the second curve segment, the third curve segment, and the first end point is disposed opposite to the first pole part, and the second end point is disposed opposite to the second pole part. That is to say, the first part of the fourth curve segment is disposed opposite to the first pole part, and the second part of the fourth curve segment is disposed opposite to the second pole part.

[0039] Among them, the line connecting the intersection point of the first curve segment and the second curve segment to the center of the mounting hole is the first connection line, the line connecting the intersection point of the second curve segment and the third curve segment to the center of the mounting hole is the second connection line, the line connecting the first end point to the center of the mounting hole is the third connection line, and the line connecting the end point of the first curve segment departing from the second curve segment to the center of the mounting hole is the fourth connection line. The included angle between the first connection line and the second connection line is θ 1 , and the included angle between the third connection line and the fourth connection line is θ 2 , θ 1 and θ 2 satisfy the relationship: 0 < θ 1 < θ 2 < π / p.

[0040] θ 1 , θ 2 , R 1 , R 2 , R 3 , L m , h and p cooperate to form a distance from a part of the mating edge to the center of the mounting hole, which is less than the distance from the other part of the mating edge to the center of the mounting hole. In other words, the mating edge is a curved edge arranged in a convex-concave manner. This setting is beneficial to reducing torque ripple. If the above limitations are not met, the torque ripple will deteriorate, thereby reducing the service performance of the product.

[0041] In some embodiments, optionally, the line connecting the midpoint of the second curve segment to the center of the mounting hole is denoted as the fifth connection line, and the first curve segment and the third curve segment are symmetrically arranged with respect to the fifth connection line; the second curve segment is symmetrically arranged with respect to the line connecting the midpoint of the second curve segment and the center of the mounting hole; the fourth curve segment is symmetrically arranged with respect to the line connecting the midpoint of the fourth curve segment and the center of the mounting hole.

[0042] In this embodiment, the mating structure of the first curve segment, the second curve segment and the third curve segment is further defined such that the line connecting the midpoint of the second curve segment to the center of the mounting hole is denoted as the fifth connection line, and the first curve segment and the third curve segment are symmetrically arranged with respect to the fifth connection line. This setting makes the magnetic field lines more evenly distributed, and the air-gap magnetic field more evenly and symmetrically distributed. In this way, the waveform distortion rate of the air-gap magnetic field is small, which can effectively improve the performance of the motor and effectively reduce the running noise of the motor.

[0043] The second curve segment is symmetrically arranged with respect to the line connecting the midpoint of the second curve segment and the center of the mounting hole, and the fourth curve segment is symmetrically arranged with respect to the line connecting the midpoint of the fourth curve segment and the center of the mounting hole. This setting makes the magnetic field lines more evenly distributed, and the air-gap magnetic field more evenly and symmetrically distributed. In this way, the waveform distortion rate of the air-gap magnetic field is small, which can effectively improve the performance of the motor and effectively reduce the running noise of the motor.

[0044] In some embodiments, optionally, the center of the mounting hole coincides with the center corresponding to the outer edge of the punching sheet body; when a cross-section of the punching sheet body is taken along the axial direction perpendicular to the rotor punching sheet, in the cross-section, the contour line of the mounting hole is a closed curve connected end to end, and the contour line of the outer edge of the punching sheet body is a closed curve connected end to end.

[0045] In this embodiment, the structure of the punching sheet body is further defined. Specifically, the center of the mounting hole is the first center, the center corresponding to the outer edge of the punching sheet body is the second center, and the first center and the second center coincide.

[0046] Moreover, when a cross-section of the punching sheet body is taken along the axial direction perpendicular to the rotor punching sheet, in the cross-section, the contour line of the mounting hole is a closed curve connected end to end, and the contour line of the punching sheet body is a closed curve connected end to end.

[0047] In some embodiments, optionally, the width of the fixing protrusion in the circumferential direction of the rotor punching sheet is denoted as w 1 , the length of the fixing protrusion in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is denoted as b 1 , the number of the fixing protrusions is denoted as m 1 , the width of the connecting portion in the circumferential direction of the rotor punching sheet is denoted as w 2 , the length of the connecting portion in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is denoted as b 2 , the number of the connecting portions is denoted as m 2 , the depth of the mounting groove in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is denoted as W m , the distance from the center of the mounting hole to the outer peripheral wall of the annular portion is denoted as R 4 ; wherein, w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 <π×((R 1 -W m ) 2 -R 4 2 ), w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 <π×((R 2 -W m ) 2 -R 4 2 ).

[0048] In this embodiment, the mating structure of the fixing protrusion, the connecting portion, the mounting hole, and the mounting groove is defined. Among them, the width of the fixing protrusion in the circumferential direction of the rotor punching sheet is w 1 , the length of the fixing protrusion in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is 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 sheet is w 2 , the length of the connecting portion in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is b 2 , the number of the connecting portions is m 2 , the depth of the mounting groove in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is W m , the distance from the center of the mounting hole to the outer peripheral wall of the annular portion is R 4 . w 1 , b 1 , m 1 , w 2 , b 2 , m 2 , R 1 , W m , R 2 and R 4 satisfy w 1 × b 1 × m 1 + w 2 × b 2 × m 2 < π × ((R 1 - W m )2 - R 4 2 ), w 1 × b 1 × m 1 + w 2 × b 2 × m 2 < π × ((R 2 - W m ) 2 - R 4 2) That is to say, the structure of the inner magnetic bridge is further 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 matching dimensions of the rotor punching sheet, the permanent magnet and the rotating shaft can be ensured, and the production cost of the product can be reduced. In addition, the structural setting optimizes the structure of the inner magnetic bridge. More specifically, the matching dimensions of the inner magnetic bridge and the permanent magnet are optimized. In this way, the magnetic force lines can be reasonably arranged, which is beneficial to reducing magnetic leakage, improving the torque density and suppressing torque ripple. That is to say, this setting takes into account the production cost, structural strength and service performance of the product, which is beneficial to enhancing the market competitiveness of the product.

[0049] 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 fixed protrusion 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 is determined in the same way as w 1 , which will not be elaborated here.

[0050] 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 fixed protrusion includes a third line segment and a fourth line segment, and the third line segment and the fourth line segment are arranged at intervals along the direction from the mounting hole to the outer peripheral wall of the punching sheet body. The point on the third line segment is denoted as the third point, and along the direction from the mounting hole to the outer peripheral wall of the 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 is determined in the same way as b 1 , which will not be elaborated here.

[0051] 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 point on the contour line of the bottom of the mounting groove is denoted as the fifth point, and along the direction from the mounting hole to the outer peripheral wall of the punching sheet body, the distance from the fifth point to the notch of the mounting groove is denoted as W m .

[0052] In some embodiments, optionally, the distance from the inner peripheral wall to the outer peripheral wall of the annular portion is denoted as H 1 , and the distance from the center of the mounting hole to the inner peripheral wall of the annular portion is denoted as R 0 , where H 1 ×(H 1 +2×R 0 )<R1 2 -R 0 2 ,H 1 ×(H 1 +2×R 0 ) < R 2 2 -R 0 2 。

[0053] In this embodiment, the structure of the inner magnetic bridge is further defined such that the distance from the inner peripheral wall to the outer peripheral wall of the annular portion is H 1 , and the distance from the center of the mounting hole to the inner peripheral wall of the annular portion is R 0 , where H 1 ×(H 1 +2×R 0 ) < R 1 2 -R 0 2 , H 1 ×(H 1 +2×R 0 ) < R 2 2 -R 0 2 . That is to say, the structure of the inner magnetic bridge is optimized (for example, while ensuring the structural strength of the rotor punching, 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 can also be ensured, and the probability of deformation of the rotor punching is reduced. Compared with the related art in which the rotor core is formed by injection molding, the matching dimensions of the rotor punching, the permanent magnet and the rotating shaft can be ensured, and the production cost of the product can be reduced. In addition, this structural setting optimizes the structure of the inner magnetic bridge. In this way, it can play a role in reasonably arranging the magnetic field lines, which is beneficial to reducing magnetic leakage, achieving the effect of improving the torque density and suppressing torque ripple. That is to say, this setting takes into account the production cost, structural strength and service performance of the product, which is beneficial to enhancing the market competitiveness of the product.

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

[0055] In this embodiment, the relationship between m 1 , m 2 and p is further defined. Such that m 1 and p satisfy: m 1 = 2×p; m 2 and p satisfy: m2 = p, or m 2 = 2 × p. The number of pole pairs of the motor is denoted as p.

[0056] Wherein, m 1 = 2 × p, so that each fixing protrusion cooperates with one mounting groove. More specifically, each fixing protrusion is used to limit a permanent magnet.

[0057] 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.

[0058] 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.

[0059] In this embodiment, the shapes of the fixing protrusion and the connecting part are further defined.

[0060] 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.

[0061] 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.

[0062] In some embodiments, optionally, at least two fixing protrusions are arranged between any two adjacent connecting parts.

[0063] In this embodiment, the cooperation structure of multiple connecting parts and multiple fixing protrusions is defined, so that at least two fixing protrusions are arranged between any two adjacent connecting parts. For example, three fixing protrusions are arranged between any two adjacent connecting parts, for example, four fixing protrusions are arranged between any two adjacent connecting parts, etc., which are not listed one by one here.

[0064] This setting can not only ensure the structural strength of the rotor punching sheet, but also reduce the number of connecting parts, which is beneficial to reducing the cost of the rotor punching sheet.

[0065] A second aspect of the present invention proposes 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 of 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.

[0066] 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 of the embodiments of the first aspect, it has all the beneficial effects of the above-mentioned rotor punching sheets, and will not be elaborated one by one here.

[0067] In some embodiments, optionally, in the rotor punching sheet, the part of the isolation groove located between two adjacent connecting parts is a sub-groove; the plurality of rotor punching sheets include a first rotor punching sheet and a second rotor punching sheet, the sub-groove of the first rotor punching sheet is disposed opposite to the connecting part of the second rotor punching sheet, and the connecting part of the first rotor punching sheet is disposed opposite to the sub-groove of the second rotor punching sheet.

[0068] In this embodiment, in the rotor punching sheet, the part of the isolation groove located between two adjacent connecting parts is a sub-groove.

[0069] And classify the types of the plurality of rotor punching sheets. 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 disposed opposite to the connecting part of the second rotor punching sheet, and the connecting part of the first rotor punching sheet is disposed opposite to the sub-groove of the second rotor punching sheet. This setting is beneficial to eliminating the magnetic leakage at the shaft end and making the overall magnetic field line distribution more uniform.

[0070] 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.

[0071] In this embodiment, that is, the mating structure of the plurality of first rotor punching sheets and the plurality of second rotor punching sheets is defined.

[0072] It can be understood that by rotating at least one of the plurality of rotor punching sheets, the plurality of rotor punching sheets are divided into a plurality of first rotor punching sheets and a plurality of second rotor punching sheets according to the placement positions to ensure the use requirement that the connecting part of the first rotor punching sheet is disposed opposite to the sub-groove of the second rotor punching sheet.

[0073] Optionally, at least one second rotor punching sheet is stacked between two adjacent first rotor punching sheets.

[0074] Optionally, at least one first rotor punching sheet is stacked between two adjacent second rotor punching sheets.

[0075] In some other embodiments, the number of the first rotor punching sheet and the second rotor punching sheet is both one. The third aspect of the present invention provides a motor, including: a rotor as in the second aspect.

[0076] The motor provided by the present invention includes a rotor as in the second aspect, and thus has all the beneficial effects of the above-mentioned rotor, and will not be elaborated one by one here.

[0077] The 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.

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

[0079] The 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.

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

[0081] It should be noted that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0082] 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

[0083] 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:

[0084] Figure 1 shows a schematic structural diagram of a rotor punching sheet according to an embodiment of the present application;

[0085] Figure 2 shows a schematic diagram of dimension markings of a rotor punching sheet according to an embodiment of the present application;

[0086] Figure 3 shows a partial schematic structural diagram of a rotor core according to an embodiment of the present application;

[0087] Figure 4 shows a data curve diagram of the average torque and torque ripple of the motor of the present application varying with the change of X;

[0088] Figure 5 shows a data curve diagram of the average torque and torque ripple of the motor of the present application varying with 1 / R 2 variation.

[0089] Wherein, Figures 1 to 3The corresponding relationship between the reference numerals in the drawings and the component names is as follows:

[0090] 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, 300a First pole part, 300b Second pole part, 400 Inner magnetic bridge, 410 Ring part, 412 Outer peripheral wall of the ring part, 414 Inner peripheral wall of the ring part, 420 Fixed protrusion, 430 Connecting part, 500 Outer magnetic bridge, 600 Isolation groove, 610 Sub-groove, 700 Outer peripheral wall of the punching sheet body, 800 Fitting edge, 810 First curve segment, 820 Second curve segment, 830 Third curve segment, 840 Fourth curve segment, 842 First end point, 844 Second end point, 9 Rotor, 900 Rotor core, 910 Slot, 1000 Permanent magnet, 1100 First connection line, 1200 Second connection line, 1300 Third connection line, 1400 Fourth connection line, 1500 Fifth connection line. Detailed implementation manners

[0091] In order to be able to more clearly understand the above objects, features and advantages of the present application, the present application will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0092] 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.

[0093] The following refers to Figures 1 to 5 A rotor punching sheet 1, a rotor 9, a motor, a chassis system and a vehicle according to some embodiments of the present application.

[0094] As Figure 1 And Figure 2 As shown, a rotor punching sheet 1 according to some embodiments of the present application is for a motor, and the rotor punching sheet 1 includes a punching sheet body 10.

[0095] The punching sheet body 10 is provided with a mounting hole 100 and a plurality of mounting grooves 200.

[0096] The plurality of mounting grooves 200 are arranged at intervals around the mounting hole 100.

[0097] The part of the punching sheet body 10 between two adjacent mounting grooves 200 is the pole part 300.

[0098] The part of the punching sheet body 10 between the mounting hole 100 and the mounting groove 200 is the inner magnetic bridge 400.

[0099] The part of the punching sheet body 10 between the installation groove 200 and the outer peripheral wall 700 of the punching sheet body is the outer magnetic bridge 500.

[0100] The inner magnetic bridge 400 includes an annular part 410, a plurality of fixing protrusions 420 and a plurality of connecting parts 430.

[0101] The annular part 410 is arranged around the installation hole 100.

[0102] The outer peripheral wall 412 of the annular part is arranged at an interval from the pole part 300 to enclose an isolation groove 600.

[0103] The installation groove 200 communicates with the isolation groove 600.

[0104] The plurality of fixing protrusions 420 are all connected to the outer peripheral wall 412 of the annular part.

[0105] Each installation groove 200 is arranged opposite to at least one fixing protrusion 420.

[0106] Each connecting part 430 is connected between the outer peripheral wall 412 of the annular part and the pole part 300.

[0107] The plurality of connecting parts 430 and the plurality of fixing protrusions 420 are arranged staggeredly.

[0108] The distance from the part of the outer peripheral wall 700 of the punching sheet body opposite to the pole part 300 to the center of the installation hole 100 is denoted as R 1 .

[0109] The distance from the part of the outer peripheral wall 700 of the punching sheet body opposite to the installation groove 200 to the center of the installation hole 100 is denoted as R 2 .

[0110] The distance from the center of the installation hole 100 to the pole part 300 is denoted as R 3 .

[0111] The width of the installation groove 200 in the circumferential direction of the punching sheet body 10 is denoted as L m .

[0112] The distance from the installation groove 200 to the outer peripheral wall 700 of the punching sheet body is denoted as h.

[0113] The number of pole pairs of the motor is denoted as p.

[0114] The depth of the installation groove 200 in the direction from the installation hole 100 to the outer peripheral wall 700 of the punching sheet body is denoted as W m .

[0115] Wherein, 4×p×L m ×h < π×(R 1 +R 2 +2×R 3 )×Wm 。

[0116] In this embodiment, the rotor punching sheet 1 includes a punching sheet body 10.

[0117] 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 1000. 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 700 of the punching sheet body.

[0118] 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 grooves 200 is an inner magnetic bridge 400, and the portion of the punching sheet body 10 between the mounting grooves 200 and the outer peripheral wall 700 of the punching sheet body is an outer magnetic bridge 500.

[0119] The inner magnetic bridge 400 includes an annular portion 410, a plurality of fixing protrusions 420, and a plurality of connecting portions 430.

[0120] Among them, the annular portion 410 has an inner peripheral wall and an outer peripheral wall. The inner peripheral wall 414 of the annular portion 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 9 to form a shaft hole, and the rotating shaft of the motor is inserted into the shaft hole.

[0121] The plurality of fixing protrusions 420 are all connected to the outer peripheral wall 412 of the annular portion. Any one of the plurality of fixing protrusions 420 is connected to the outer peripheral wall 412 of the annular portion. Each mounting groove 200 is disposed opposite to at least one fixing protrusion 420. That is to say, each mounting groove 200 cooperates with at least one fixing protrusion 420. The fixing protrusion 420 has the function of supporting and fixing the permanent magnet 1000 in the mounting groove 200. In this way, the matching dimensions of the permanent magnet 1000, 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.

[0122] Any one of the plurality of connecting portions 430 is connected between the outer peripheral wall 412 of the annular portion and the pole portion 300. That is, the first end of the connecting portion 430 is connected to the outer peripheral wall 412 of the annular portion, and the second end of the connecting portion 430 is connected to the pole portion 300. It can also be said that the annular portion 410 and the pole portion 300 are assembled together through the plurality of connecting portions 430, and the matching dimensions of the rotating shaft, the punching sheet body 10, and the permanent magnet 1000 can be ensured.

[0123] Compared with the related art in which the inner magnetic bridge is removed and the rotor punching sheet 1 is formed by injection molding, this setting can improve the structural strength of the rotor punching sheet 1, reduce the occurrence probability of deformation of the rotor punching sheet 1, and ensure the stability and reliability of the motor operation.

[0124] Optionally, an inner magnetic bridge 400 is integrally formed on the punching sheet body 10. 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. Moreover, the structural strength of the rotor punching sheet 1 can be ensured.

[0125] Further, the distance from the part of the outer peripheral wall 700 of the punching sheet body opposite to the pole part 300 to the center of the mounting hole 100 is R 1 The distance from the part of the outer peripheral wall 700 of the punching sheet body opposite to the mounting groove 200 to the center of the mounting hole 100 is R 2 The distance from the center of the mounting hole 100 to the pole part 300 is R 3 The width of the mounting groove 200 in the circumferential direction of the punching sheet body 10 is L m The distance from the mounting groove 200 to the outer peripheral wall 700 of the punching sheet body is h, the number of pole pairs of the motor is P, 4×p×L m ×h < π×(R 1 +R 2 +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 1000, 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 900 is formed by injection molding, the mating dimensions of the rotor punching sheet 1, the permanent magnet 1000, 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 500. 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.

[0126] In some other embodiments, the punching sheet body 10 is provided with a clamping portion for fixing the permanent magnet 1000.

[0127] Optionally, the fixing protrusion 420 extends from the outer peripheral wall 412 of the annular portion towards the mounting groove 200.

[0128] Optionally, the fixing protrusion 420 is located between the outer peripheral wall 412 of the annular portion and the mounting groove 200.

[0129] Optionally, a part of the fixing protrusion 420 extends into the mounting groove 200.

[0130] It can be understood that the installation groove 200 communicates with the isolation groove 600. For example, the notch of the installation groove 200 communicates with the isolation groove 600, and the fixing protrusion 420 and the connecting portion 430 are both located at the isolation groove 600. In this way, it can ensure that the fixing protrusion 420 functions to fix the permanent magnet 1000, and can also meet the usage requirements for the connecting portion 430 to be connected between the annular portion 410 and the pole portion 300.

[0131] It can be understood that the plurality of connecting portions 430 and the plurality of fixing protrusions 420 are arranged staggeredly. For example, the plurality of connecting portions 430 are arranged at intervals around the mounting hole 100, the plurality of fixing protrusions 420 are arranged at intervals around the mounting hole 100, and at least one fixing protrusion 420 is provided between any two adjacent connecting portions 430.

[0132] The connecting portion 430 and the fixing protrusion 420 will not interfere with each other.

[0133] In some embodiments, optionally, R 1 、R 2 、R 3 、L m 、h and p satisfy: 0 < (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m ) < 0.2.

[0134] In this embodiment, the structure of the punching sheet body 10 is further defined, such that R 1 、R 2 、R 3 、L m 、h and p satisfy the relationship: 0 < (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m ) < 0.2. In this way, the structure of the outer magnetic bridge 500 is further optimized, and further, the production cost, structural strength, and usage performance of the product are further optimized, which is beneficial to improving the market competitiveness of the product.

[0135] Optionally, (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m ) = 0.18, (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m) = 0.15, (4×p×L m ×h) / (π×(R 1 +R 2 +2×R 3 )×W m ) = 0.12, (4×p×L m ×h) / (π×(R 1 +R 2 +2×R 3 )×W m ) = 0.1 etc., not listed one by one here.

[0136] In some embodiments, optionally, R 1 , R 2 , R 3 , L m , h and p satisfy: 0 < (4×p×L m ×h) / (π×(R 1 +R 2 +2×R 3 )×W m ) < 0.08.

[0137] In this embodiment, the structure of the punching sheet body 10 is further defined, such that R 1 , R 2 , R 3 , L m , h and p satisfy the relationship: 0 < (4×p×L m ×h) / (π×(R 1 +R 2 +2×R 3 )×W m ) < 0.08. In this way, the structure of the outer magnetic bridge 500 is further optimized, and further, the production cost, structural strength and service performance of the product are optimized, which is beneficial to improving the market competitiveness of the product.

[0138] In some embodiments, optionally, as Figure 1 shown, R 1 and R 2 satisfy: 0.85 ≤ R 1 / R 2 ≤ 1.35.

[0139] In this embodiment, the structure of the punching sheet body 10 is further defined, such that the relationship between R 1 and R 2 satisfies: 0.85 ≤ R 1 / R 2 ≤ 1.35. In this way, the air-gap magnetic field is adjusted, the magnetic resistance will be reduced, which is beneficial to reducing magnetic leakage, achieving the effect of increasing the torque density and suppressing torque ripple.

[0140] If R 1 / R 2 is greater than 1.35, then the gap between the stator and rotor 9 is too large, which will increase the magnetic resistance, and further increase the magnetic leakage, and reduce the torque density.

[0141] If R 1 / R 2 is less than 0.85, then the gap between the stator and rotor 9 is too large, which will increase the magnetic resistance, and further increase the magnetic leakage, and reduce the torque density.

[0142] In some embodiments, optionally, R 1 and R 2 satisfy: 0.96 ≤ R 1 / R 2 ≤ 1.1.

[0143] In this embodiment, the structure of the punching sheet body 10 is further defined, such that the relationship between R 1 and R 2 satisfies: 0.96 ≤ R 1 / R 2 ≤ 1.1. In this way, the air-gap magnetic field is further adjusted, the magnetic resistance is reduced, which is beneficial to reducing the magnetic leakage, achieving the effect of improving the torque density and suppressing the torque ripple.

[0144] Optionally, R 1 / R 2 = 0.98, R 1 / R 2 = 0.99 and R 1 / R 2 = 1, etc., which will not be listed one by one here.

[0145] In some embodiments, optionally, as Figure 1 shown, the punching sheet body 10 is sectioned along the axial direction perpendicular to the rotor punching sheet 1. In the section, the contour line of the punching sheet body 10 includes a plurality of mating edges 800 connected end to end in sequence.

[0146] The mating edge 800 includes a first curve segment 810, a second curve segment 820, a third curve segment 830 and a fourth curve segment 840 connected in sequence.

[0147] The fourth curve segment 840 has a first end point 842 and a second end point 844.

[0148] The first end point 842 is connected to the third curve segment 830.

[0149] Two adjacent pole parts 300 are respectively denoted as a first pole part 300a and a second pole part 300b.

[0150] The first curved segment 810, the second curved segment 820, the third curved segment 830, and the first end point 842 are all disposed opposite to the first pole portion 300a, and the second end point 844 is disposed opposite to the second pole portion 300b.

[0151] The distance from any one of the first curved segment 810, the second curved segment 820, and the third curved segment 830 to the center of the mounting hole 100 is greater than the distance from the fourth curved segment 840 to the center of the mounting hole 100.

[0152] The line connecting the intersection point of the first curved segment 810 and the second curved segment 820 to the center of the mounting hole 100 is denoted as the first connection line 1100.

[0153] The line connecting the intersection point of the second curved segment 820 and the third curved segment 830 to the center of the mounting hole 100 is denoted as the second connection line 1200.

[0154] The line connecting the first end point 842 to the center of the mounting hole 100 is denoted as the third connection line 1300.

[0155] The line connecting the end point of the first curved segment 810 departing from the second curved segment 820 to the center of the mounting hole 100 is denoted as the fourth connection line 1400.

[0156] The included angle between the first connection line 1100 and the second connection line 1200 is denoted as θ 1 。

[0157] The included angle between the third connection line 1300 and the fourth connection line 1400 is denoted as θ 2 。

[0158] Wherein, 0 < θ 1 <θ 2 <π / p.

[0159] In this embodiment, the structure of the punching sheet body 10 is further defined. The punching sheet body 10 is sectioned along the axial direction perpendicular to the rotor punching sheet 1. In the section, the contour line of the punching sheet body 10 includes a plurality of mating edges 800 connected end to end in sequence. The contour line of the punching sheet body 10 is divided. The contour line of the punching sheet body 10 includes a plurality of mating edges 800, and the plurality of mating edges 800 are connected end to end in sequence to form a closed structure.

[0160] Further, the mating edge 800 is divided. Each mating edge 800 includes a first curved segment 810, a second curved segment 820, a third curved segment 830, and a fourth curved segment 840 connected in sequence. That is, the second curved segment 820 is connected between the first curved segment 810 and the third curved segment 830, and the fourth curved segment 840 is connected to the side of the third curved segment 830 departing from the second curved segment 820.

[0161] The setting positions of the mating edge 800 and the pole parts 300 are defined. Among them, two adjacent pole parts 300 are respectively denoted as the first pole part 300a and the second pole part 300b. Any one of the first curve segment 810, the second curve segment 820, the third curve segment 830, and the first end point 842 is arranged opposite to the first pole part 300a, and the second end point 844 is arranged opposite to the second pole part 300b. That is to say, the first part of the fourth curve segment 840 is arranged opposite to the first pole part 300a, and the second part of the fourth curve segment 840 is arranged opposite to the second pole part 300b.

[0162] Among them, the connection line between the intersection point of the first curve segment 810 and the second curve segment 820 and the center of the mounting hole 100 is the first connection line 1100, the connection line between the intersection point of the second curve segment 820 and the third curve segment 830 and the center of the mounting hole 100 is the second connection line 1200, the connection line between the first end point 842 and the center of the mounting hole 100 is the third connection line 1300, and the connection line between the end point of the first curve segment 810 departing from the second curve segment 820 and the center of the mounting hole 100 is the fourth connection line 1400. The included angle between the first connection line 1100 and the second connection line 1200 is θ 1 and the included angle between the third connection line 1300 and the fourth connection line 1400 is θ 2 , θ 1 and θ 2 The relationship of satisfies: 0 < θ 1 < θ 2 < π / p.

[0163] θ 1 , θ 2 , R 1 , R 2 , R 3 , L m , h and p cooperate to form that the distance from a part of the mating edge 800 to the center of the mounting hole 100 is less than the distance from the other part of the mating edge 800 to the center of the mounting hole 100. It can also be said that the mating edge 800 is a curved edge arranged in a concave-convex manner. This setting is beneficial to reducing torque ripple. If the above limitations are not met, the torque ripple will deteriorate, thereby reducing the service performance of the product.

[0164] In some embodiments, optionally, as Figure 1 shown, the connection line between the midpoint of the second curve segment 820 and the center of the mounting hole 100 is denoted as the fifth connection line 1500. The first curve segment 810 and the third curve segment 830 are symmetrically arranged with respect to the fifth connection line 1500; the second curve segment 820 is symmetrically arranged with respect to the connection line between the midpoint of the second curve segment 820 and the center of the mounting hole 100; the fourth curve segment 840 is symmetrically arranged with respect to the connection line between the midpoint of the fourth curve segment 840 and the center of the mounting hole 100.

[0165] In this embodiment, the mating structure of the first curve segment 810, the second curve segment 820, and the third curve segment 830 is further defined such that the line connecting the midpoint of the second curve segment 820 and the center of the mounting hole 100 is denoted as the fifth connection line 1500, and the first curve segment 810 and the third curve segment 830 are symmetrically arranged with respect to the fifth connection line 1500 as the axis of symmetry. This setting makes the magnetic field lines more evenly distributed, and the air-gap magnetic field more evenly and symmetrically distributed. In this way, the waveform distortion rate of the air-gap magnetic field is small, which can effectively improve the performance of the motor and effectively reduce the operating noise of the motor.

[0166] The second curve segment 820 is symmetrically arranged with respect to the line connecting the midpoint of the second curve segment 820 and the center of the mounting hole 100 as the axis of symmetry, and the fourth curve segment 840 is symmetrically arranged with respect to the line connecting the midpoint of the fourth curve segment 840 and the center of the mounting hole 100 as the axis of symmetry. This setting makes the magnetic field lines more evenly distributed, and the air-gap magnetic field more evenly and symmetrically distributed. In this way, the waveform distortion rate of the air-gap magnetic field is small, which can effectively improve the performance of the motor and effectively reduce the operating noise of the motor.

[0167] In some embodiments, optionally, the center of the mounting hole 100 coincides with the center corresponding to the outer edge of the punching sheet body 10.

[0168] The punching sheet body 10 is sectioned along the axis perpendicular to the rotor punching sheet 1. In the section, the contour line of the mounting hole 100 is a closed curve connected end to end.

[0169] The contour line of the outer edge of the punching sheet body 10 is a closed curve connected end to end.

[0170] In this embodiment, the structure of the punching sheet body 10 is further defined. Specifically, the center of the mounting hole 100 is the first center, and the center corresponding to the outer edge of the punching sheet body 10 is the second center, and the first center and the second center coincide.

[0171] Moreover, the punching sheet body 10 is sectioned along the axis perpendicular to the rotor punching sheet 1. In the section, the contour line of the mounting hole 100 is a closed curve connected end to end, and the contour line of the punching sheet body 10 is a closed curve connected end to end.

[0172] Optionally, the contour line of the mounting hole 100 includes a curve segment and / or a broken line segment.

[0173] Optionally, the contour line of the punching sheet body 10 includes a curve segment and / or a broken line segment.

[0174] In some embodiments, optionally, as Figure 1 and Figure 2 shown, the width of the fixing protrusion 420 in the circumferential direction of the rotor punching sheet 1 is denoted as w 1 .

[0175] The length of the fixing protrusion 420 in the direction from the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is denoted as b 1 .

[0176] The number of the fixing protrusions 420 is denoted as m 1 .

[0177] The width of the connecting portion 430 in the circumferential direction of the rotor punching sheet 1 is denoted as w 2 .

[0178] The length of the connecting portion 430 in the direction from the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is denoted as b 2 .

[0179] The number of the connecting portions 430 is denoted as m 2 .

[0180] The depth of the mounting groove 200 in the direction from the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is denoted as W m .

[0181] The distance from the center of the mounting hole 100 to the outer peripheral wall 412 of the annular portion is denoted as R 4 .

[0182] Wherein, w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 <π×((R 1 -W m ) 2 -R 4 2 ),w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 <π×((R 2 -W m ) 2 -R 4 2 ).

[0183] In this embodiment, the mating structure of the fixing protrusion 420, the connecting portion 430, the mounting hole 100 and the mounting groove 200 is defined. Among them, the width of the fixing protrusion 420 in the circumferential direction of the rotor punching sheet 1 is w 1 , the length of the fixing protrusion 420 in the direction from the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is b 1 , and the number of the fixing protrusions 420 is m 1, the width of the connecting portion 430 in the circumferential direction of the rotor punching sheet 1 is w 2 , the length of the connecting portion 430 in the direction from the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is b 2 , the number of the connecting portions 430 is m 2 , the depth of the mounting groove 200 in the direction from the mounting hole 100 to the outer peripheral wall 700 of the punching sheet body is W m , the distance from the center of the mounting hole 100 to the outer peripheral wall 412 of the annular portion is R 4 . w 1 , b 1 , m 1 , w 2 , b 2 , m 2 , R 1 , W m , R 2 and R 4 satisfy w 1 × b 1 × m 1 + w 2 × b 2 × m 2 < π × ((R 1 - W m ) 2 - R 4 2 ), w 1 × b 1 × m 1 + w 2 × b 2 × m 2 < π × ((R 2 - W m ) 2 - R 4 2 ). That is to say, 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 1000, 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 iron core 900 by injection molding, the matching dimensions of the rotor punching sheet 1, the permanent magnet 1000 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 matching dimensions of the inner magnetic bridge 400 and the permanent magnet 1000 are optimized. In this way, the magnetic field lines can be reasonably distributed, which is beneficial to reducing magnetic leakage, improving the torque density and suppressing torque ripple. That is to say, this setting takes into account the production cost, structural strength and service performance of the product, which is beneficial to enhancing the market competitiveness of the product.

[0184] In some embodiments, optionally, as Figure 1 and Figure 2 shown, the distance from the inner peripheral wall 414 to the outer peripheral wall of the annular portion is denoted as H 1 .

[0185] The distance from the center of the mounting hole 100 to the inner peripheral wall 414 of the annular portion is denoted as R 0 .

[0186] Wherein, H 1 ×(H 1 +2×R 0 ) < R 1 2 -R 0 2 , H 1 ×(H 1 +2×R 0 ) < R 2 2 -R 0 2 .

[0187] In this embodiment, the structure of the inner magnetic bridge 400 is further defined such that the distance from the inner peripheral wall 414 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 414 of the annular portion is R 0 , wherein, H 1 ×(H 1 +2×R 0 ) < R 1 2 -R 0 2 , H 1 ×(H 1 +2×R 0 ) < R 2 2 -R 0 2That is, the structure of the inner magnetic bridge 400 is optimized (for example, while ensuring the structural strength of the rotor punching 1, the area of the inner magnetic bridge 400 can be reduced). On the basis of ensuring the effective assembly of the rotating shaft and the permanent magnet 1000, the structural strength of the rotor punching 1 can also be ensured, and the probability of deformation of the rotor punching 1 can be reduced. Compared with the related art in which the rotor core 900 is formed by injection molding, the mating dimensions of the rotor punching 1, the permanent magnet 1000, and the rotating shaft can be ensured, and the production cost of the product can also be reduced. In addition, the structural setting optimizes the structure of the inner magnetic bridge 400. 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.

[0188] 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.

[0189] 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.

[0190] Among them, m 1 = 2×p. In this way, each fixing protrusion 420 is matched with one mounting groove 200. More specifically, each fixing protrusion 420 is used to limit one permanent magnet 1000.

[0191] Among them, m 2 = p, or m 2 = 2×p. That is, the relationship between the number of connecting portions 430 and the number of pole pairs of the motor is defined.

[0192] Optionally, at least one fixing protrusion 420 is provided between two adjacent connecting portions 430.

[0193] In some embodiments, optionally, the fixing protrusion 420 includes at least one of a strip segment and an arc segment; and / or the connecting portion 430 includes at least one of a strip segment and an arc segment.

[0194] In this embodiment, the shapes of the fixing protrusion 420 and the connecting portion 430 are further defined.

[0195] Among them, the fixing protrusion 420 includes a strip segment and / or an arc segment. For example, the fixing protrusion 420 includes a strip segment. For example, the fixing protrusion 420 includes an arc segment. For example, the fixing protrusion 420 includes a strip segment and an arc segment.

[0196] And / or the connecting portion 430 includes at least one of a strip segment and an arc segment. For example, the connecting portion 430 includes a strip segment. For example, the connecting portion 430 includes an arc segment. For example, the connecting portion 430 includes a strip segment and an arc segment.

[0197] In some embodiments, optionally, at least two fixing protrusions 420 are provided between any two adjacent connecting portions 430.

[0198] In this embodiment, the mating structure of the plurality of connecting portions 430 and the plurality of fixing protrusions 420 is defined such that at least two fixing protrusions 420 are provided between any two adjacent connecting portions 430. For example, three fixing protrusions 420 are provided between any two adjacent connecting portions 430. For example, four fixing protrusions 420 are provided between any two adjacent connecting portions 430, etc., which are not listed one by one here.

[0199] This setting can not only ensure the structural strength of the rotor punching sheet 1, but also reduce the number of connecting portions 430, which is beneficial to reducing the cost of the rotor punching sheet 1.

[0200] In some other embodiments, one fixing protrusion 420 is provided between any two adjacent connecting portions 430.

[0201] Such as Figure 3 As shown, a rotor 9 according to still some other embodiments of the present application, the rotor 9 includes a rotor core 900 and a plurality of permanent magnets 1000.

[0202] The rotor core 900 is formed by stacking a plurality of rotor punching sheets 1 as described in any of the above embodiments.

[0203] The mounting grooves 200 of the plurality of rotor punching sheets 1 penetrate along the axial direction of the rotor core 900 to form a slot 910.

[0204] One permanent magnet 1000 is disposed in each slot 910.

[0205] In this embodiment, the rotor 9 includes a rotor core 900 and a plurality of permanent magnets 1000.

[0206] The rotor punching sheet 1 includes a punching sheet body 10.

[0207] 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 1000. The mounting grooves 200 are arranged at intervals from the mounting hole 100, and the mounting grooves 200 are arranged at intervals from the outer peripheral wall 700 of the punching sheet body.

[0208] The part of the punching sheet body 10 between two adjacent mounting grooves 200 is a pole part 300, the part of the punching sheet body 10 between the mounting hole 100 and the mounting grooves 200 is an inner magnetic bridge 400, and the part of the punching sheet body 10 between the mounting grooves 200 and the outer peripheral wall 700 of the punching sheet body is an outer magnetic bridge 500.

[0209] The inner magnetic bridge 400 includes an annular part 410, a plurality of fixing protrusions 420 and a plurality of connecting parts 430.

[0210] Among them, the annular part 410 has an inner peripheral wall and an outer peripheral wall. The inner peripheral wall 414 of the annular part encloses the mounting hole 100. The mounting holes 100 of a plurality of rotor punching sheets 1 penetrate along the axial direction of the rotor 9 to form a shaft hole, and the rotating shaft of the motor is inserted into the shaft hole.

[0211] The plurality of fixing protrusions 420 are all connected to the outer peripheral wall 412 of the annular part. Any one of the plurality of fixing protrusions 420 is connected to the outer peripheral wall 412 of the annular part, and each mounting groove 200 is arranged opposite to at least one fixing protrusion 420. That is to say, each mounting groove 200 cooperates with at least one fixing protrusion 420. The fixing protrusion 420 has the function of supporting and fixing the permanent magnet 1000 in the mounting groove 200. In this way, the matching dimensions of the permanent magnet 1000, 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.

[0212] Any one of the plurality of connecting parts 430 is connected between the outer peripheral wall 412 of the annular part and the pole part 300. That is to say, the first end of the connecting part 430 is connected to the outer peripheral wall 412 of the annular part, and the second end of the connecting part 430 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 430, and the matching dimensions of the rotating shaft, the punching sheet body 10 and the permanent magnet 1000 can be guaranteed.

[0213] Compared with the related technology in which the inner magnetic bridge is removed and the rotor punching sheet 1 is formed by injection molding, this setting can improve the structural strength of the rotor punching sheet 1, reduce the occurrence probability of deformation of the rotor punching sheet 1, and ensure the stability and reliability of the motor operation.

[0214] Optionally, an inner magnetic bridge 400 is integrally formed on the punching sheet body 10. 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. Moreover, the structural strength of the rotor punching sheet 1 can be ensured.

[0215] Further, the distance from the part of the outer peripheral wall 700 of the punching sheet body opposite to the pole part 300 to the center of the mounting hole 100 is R 1 , the distance from the part of the outer peripheral wall 700 of the punching sheet body opposite to the mounting groove 200 to the center of the mounting hole 100 is R 2 , the distance from the center of the mounting hole 100 to the pole part 300 is R 3 , the width of the mounting groove 200 in the circumferential direction of the punching sheet body 10 is L m , the distance from the mounting groove 200 to the outer peripheral wall 700 of the punching sheet body is h, the number of pole pairs of the motor is P, 4×p×L m ×h < π×(R 1 +R 2 +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 1000, 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 in which the rotor core 900 is formed by injection molding, the matching dimensions of the rotor punching sheet 1, the permanent magnet 1000 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 500. 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.

[0216] In some embodiments, optionally, as Figure 3 shown, in the rotor punching sheet 1, the part of the isolation groove 600 located between two adjacent connecting parts 430 is the sub-groove 610.

[0217] The plurality of rotor punching sheets 1 include a first rotor punching sheet 1a and a second rotor punching sheet 1b.

[0218] The sub-groove 610 of the first rotor punching sheet 1a is disposed opposite to the connecting part 430 of the second rotor punching sheet 1b.

[0219] The connecting part 430 of the first rotor punching sheet 1a and the sub-groove 610 of the second rotor punching sheet 1b are disposed opposite to each other.

[0220] In this embodiment, in the rotor punching sheet 1, the part of the isolation groove 600 located between two adjacent connecting parts 430 is the sub-groove 610.

[0221] The types of multiple rotor punching sheets 1 are classified. The multiple rotor punching sheets 1 include a first rotor punching sheet 1a and a second rotor punching sheet 1b. Among them, the sub-groove 610 of the first rotor punching sheet 1a is disposed opposite to the connecting part 430 of the second rotor punching sheet 1b, and the connecting part 430 of the first rotor punching sheet 1a and the sub-groove 610 of the second rotor punching sheet 1b are disposed opposite to each other. This setting is beneficial to eliminating the end leakage magnetic flux and making the overall magnetic field line distribution more uniform.

[0222] 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 provided between any two adjacent first rotor punching sheets 1a. Or, at least one first rotor punching sheet 1a is provided between any two adjacent second rotor punching sheets 1b.

[0223] A motor according to some other embodiments of the present application includes: a rotor 9 as in the above embodiment.

[0224] In this embodiment, the motor includes a rotor 9. It has all the beneficial effects of the above rotor, and will not be elaborated one by one here.

[0225] A chassis system according to some other embodiments of the present application includes: a rotor 9 as in the above embodiment; or a motor as in the above embodiment.

[0226] In this embodiment, the chassis system includes a rotor 9 or a motor. Therefore, it has all the beneficial effects of the above rotor 9 or motor, and will not be elaborated one by one here.

[0227] A vehicle according to some other embodiments of the present application includes: a rotor 9 as in the above embodiment; or a motor as in the above embodiment; or a chassis system as in the above embodiment.

[0228] In this embodiment, the vehicle includes one of the rotor 9, the motor, and the chassis system in the above embodiment. Therefore, it has all the beneficial effects of one of the rotor 9, the motor, and the chassis system in the above embodiment, and will not be elaborated one by one here.

[0229] It should be noted that the vehicle can be a new energy vehicle. The new energy vehicle includes a pure electric vehicle, an extended-range electric vehicle, a hybrid electric vehicle, a fuel cell electric vehicle, a hydrogen engine vehicle, etc.

[0230] Optionally, the motor includes an electric power steering motor.

[0231] The rotor punching sheet 1 includes a punching sheet body 10, which includes: the punching sheet body 10 having 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 distributed circumferentially 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 700 of the punching sheet body is an outer magnetic bridge 500. An inner magnetic bridge 400 is provided at the inner end of the adjacent mounting grooves 200 and the pole part 300 between the adjacent mounting grooves 200, and an isolation groove 600 is provided between the inner magnetic bridge 400, the pole part 300 and the mounting groove 200. The inner magnetic bridge 400 includes an annular part 410, a plurality of fixing protrusions 420 and a plurality of connecting parts 430.

[0232] The radial width of the outer magnetic bridge 500 is h, satisfying 0 < (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m ) < 0.2, where R 1 is the maximum distance from the outer edge corresponding to the pole part 300 to the center of the mounting hole 100, R 2 is the maximum distance from the outer edge corresponding to the mounting groove 200 to the center of the mounting hole 100, R 3 is the maximum distance from the isolation groove 600 to the center of the mounting hole 100, W m is the radial length of the mounting groove 200, L m is the circumferential width of the mounting groove 200, and p is the number of pole pairs of the motor.

[0233] Taking a cross-section of the punching sheet body 10 along the axial direction perpendicular to the rotor punching sheet 1, in the cross-section, the contour line of the mounting hole 100 is a closed curve connected end to end, and the contour line of the outer edge of the punching sheet body 10 is a closed curve connected end to end. The center of the mounting hole 100 and the center corresponding to the outer edge of the punching sheet body 10 are co-point.

[0234] The rotor punching sheet 1 provided by this application effectively reduces the cogging torque, improves the torque density, suppresses the torque ripple, and thus improves the vibration and noise of the motor.

[0235] The radial width of the outer magnetic bridge 500 is h, satisfying 0 < (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m ) < 0.08.

[0236] Perform a cross-section on the lamination body 10 along the axis perpendicular to the rotor lamination 1. In the cross-section, the contour line of the lamination body 10 includes a plurality of mating edges 800 connected end to end in sequence. The mating edge 800 includes a first curve segment 810, a second curve segment 820, a third curve segment 830, and a fourth curve segment 840 connected in sequence.

[0237] The maximum distance from the outer edge corresponding to the pole part 300 to the center of the mounting hole 100 is R 1 , and the maximum distance from the outer edge corresponding to the mounting groove 200 to the center of the mounting hole 100 is R 2 , 0.85 ≤ R 1 / R 2 ≤ 1.35.

[0238] Optionally, R 1 and R 2 satisfy 0.96 ≤ R 1 / R 2 ≤ 1.1.

[0239] The connection line between the intersection point of the first curve segment 810 and the second curve segment 820 and the center of the mounting hole 100 is denoted as the first connection line 1100. The connection line between the intersection point of the second curve segment 820 and the third curve segment 830 and the center of the mounting hole 100 is denoted as the second connection line 1200. The connection line between the first end point 842 and the center of the mounting hole 100 is denoted as the third connection line 1300. The connection line between the end point of the first curve segment 810 departing from the second curve segment 820 and the center of the mounting hole 100 is denoted as the fourth connection line 1400. The included angle between the first connection line 1100 and the second connection line 1200 is denoted as θ 1 , and the included angle between the third connection line 1300 and the fourth connection line 1400 is denoted as θ 2 , where, 0 < θ 1 <θ 2 <π / p.

[0240] The magnetization direction of the permanent magnet 1000 is the tangential direction of the rotor lamination 1.

[0241] The number of pole pairs p of the motor is greater than or equal to 2.

[0242] Any one of the first curve segment 810, the second curve segment 820, the third curve segment 830, and the fourth curve segment 840 includes an arc and / or a straight line.

[0243] Perform a cross-section on the lamination body 10 along the axis perpendicular to the rotor lamination 1. In the cross-section, the inner contour line of the annular part 410 is circular, or the inner contour line of the annular part 410 includes one of an arc and a broken line.

[0244] The rotating shaft is in interference fit with the mounting hole 100.

[0245] The rotor core 900 includes a plurality of rotor punching sheets 1 which are stacked along the axis direction of the punching sheet body 10. Among them, the mounting holes 100 of the plurality of rotor punching sheets 1 communicate with each other to form a shaft hole, and each mounting groove 200 of the plurality of rotor punching sheets 1 communicates with each other to form a slot 910.

[0246] A plurality of permanent magnets 1000 are respectively received in the plurality of slots 910.

[0247] The plurality of rotor punching sheets 1 are stacked in a rotary manner. That is, the plurality of rotor punching sheets 1 include a first rotor punching sheet 1a and a second rotor punching sheet 1b. The sub-slot 610 of the first rotor punching sheet 1a is disposed opposite to the connecting portion 430 of the second rotor punching sheet 1b, and the connecting portion 430 of the first rotor punching sheet 1a and the sub-slot 610 of the second rotor punching sheet 1b are disposed opposite to each other.

[0248] The isolation groove 600 is filled with air or filled with a non-magnetic conductive material.

[0249] Denote the ratio of (4×p×L m ×h) and (π×(R 1 +R 2 +2×R 3 )×W m ) as X. Figure 4 Shows the trends of the average torque and torque ripple of the motor changing with the change of X.

[0250] Taking a 12-slot 10-pole permanent magnet motor as an example, the number of pole pairs p of the motor is 5. Figure 4 Shown are the simulation results of the average torque and torque ripple under different X. Among them, Te* and Tr* are per-unit values. Te* is the ratio of the average torque under different X to the average torque in the case of X = 0.018, and Tr* is the ratio of the torque ripple under different X to the torque ripple in the case of X = 0.018. By comprehensively comparing the results of the average torque and torque ripple, it can be found that when X is greater than 0 and less than or equal to 0.08, the performance of the motor is optimal and the cost performance is higher.

[0251] Figure 5 Shows the trends of the average torque and torque ripple of the motor changing with the ratio of R 1 / R 2 . Figure 5 Shows the simulation results of the average torque and torque ripple at different ratios of R 1 / R 2 . Among them, Te* and Tr* are both per-unit values. Te* is the ratio of the average torque under different R 1 / R 2 to the average torque in the case of R 1 / R 2 = 1.04, and Tr* is the average torque under different R1 / R 2 The torque ripple in the case of / R 1 / R 2 = 1.04 and the ratio of the torque ripple. By comprehensively comparing the results of the average torque and the torque ripple, when 0.96 ≤ R 1 / R 2 ≤ 1.1, the performance of the motor is optimal and the cost performance is higher.

[0252] The magnetization direction of the permanent magnet 1000 is tangential to the rotor punching sheet 1.

[0253] The number of pole pairs p of the motor is greater than or equal to 2.

[0254] Optionally, the chassis system includes a transmission system, a running system, a steering system (such as, an electric power steering system) and a braking system. The chassis system is used to support and install the assembly of the vehicle engine and its various components, form the overall shape of the vehicle, and receive the power of the engine to make the vehicle move and ensure normal driving.

[0255] In this application, the term "a plurality of" means two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected", "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 situations.

[0256] In the description of this specification, the description of terms such as "an embodiment", "some embodiments", "specific embodiments" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or 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 modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A rotor punching sheet, characterized in that, for a motor, the rotor punching sheet comprises: A punching sheet body, the punching sheet body is provided with a mounting hole and a plurality of mounting grooves, the plurality of mounting grooves are arranged at intervals around the mounting hole, a part of the punching sheet body between two adjacent mounting grooves is a pole part, a part of the punching sheet body between the mounting hole and the mounting groove is an inner magnetic bridge, and a part of the punching sheet body between the mounting groove and the outer peripheral wall of the punching sheet body is an outer magnetic bridge; The inner magnetic bridge comprises: A ring part, the ring part is arranged around the mounting hole, an outer peripheral wall of the ring part is arranged at intervals with the pole part to enclose an isolation groove, and the mounting groove communicates with the isolation groove; A plurality of fixing protrusions, the plurality of fixing protrusions are all connected to the outer peripheral wall of the ring part, and each mounting groove is arranged opposite to at least one fixing protrusion; A plurality of connecting parts, each connecting part is connected between the outer peripheral wall of the ring part and the pole part, and the plurality of connecting parts and the plurality of fixing protrusions are arranged staggeredly; 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 1 , 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 2 , 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, and 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 , where, 4×p×L m ×h < π×(R 1 +R 2 +2×R 3 )×W m .

2. The rotor punching sheet according to claim 1, characterized in that, R 1 、R 2 、R 3 、L m 、h, and p satisfy: 0 < (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m ) < 0.

2.

3. The rotor punching sheet according to claim 2, characterized in that, R 1 、R 2 、R 3 、L m 、h and p satisfy: 0 < (4 × p × L m × h) / (π × (R 1 + R 2 + 2 × R 3 ) × W m ) < 0.

08.

4. The rotor punching sheet according to any one of claims 1 to 3, characterized in that, R 1 and R 2 Satisfy: 0.85 ≤ R 1 / R 2 ≤ 1.

35.

5. The rotor punching sheet according to claim 4, characterized in that, R 1 and R 2 Satisfy: 0.96 ≤ R 1 / R 2 ≤ 1.1 6. The rotor punching sheet according to claim 4, characterized in that, When a cross-section is made of the punching sheet body along the axial direction perpendicular to the rotor punching sheet, in the cross-section, the contour line of the punching sheet body comprises a plurality of mating edges connected in sequence end to end; The mating edge comprises a first curve segment, a second curve segment, a third curve segment and a fourth curve segment connected in sequence, the fourth curve segment has a first end point and a second end point, and the first end point is connected to the third curve segment; Two adjacent pole parts are respectively denoted as a first pole part and a second pole part, the first curve segment, the second curve segment, the third curve segment and the first end point are all arranged opposite to the first pole part, and the second end point is arranged opposite to the second pole part; The distance from any one of the first curve segment, the second curve segment and the third curve segment to the center of the mounting hole is greater than the distance from the fourth curve segment to the center of the mounting hole; The line connecting the intersection point of the first curve segment and the second curve segment with the center of the mounting hole is denoted as the first connection line. The line connecting the intersection point of the second curve segment and the third curve segment with the center of the mounting hole is denoted as the second connection line. The line connecting the first endpoint with the center of the mounting hole is denoted as the third connection line. The line connecting the endpoint of the first curve segment away from the second curve segment with the center of the mounting hole is denoted as the fourth connection line. The angle between the first connection line and the second connection line is denoted as θ 1 , and the angle between the third connection line and the fourth connection line is denoted as θ 2 , where 0 < θ 1 < θ 2 < π / p.

7. The rotor punching sheet according to claim 6, characterized in that, A fifth connection line is denoted as the connection line between the midpoint of the second curve segment and the center of the mounting hole, and the first curve segment and the third curve segment are symmetrically arranged with respect to the fifth connection line; The second curve segment is symmetrically arranged with respect to the connection line between the midpoint of the second curve segment and the center of the mounting hole; The fourth curve segment is symmetrically arranged with respect to the connection line between the midpoint of the fourth curve segment and the center of the mounting hole.

8. The rotor punching sheet according to any one of claims 1 to 3, characterized in that, The center of the mounting hole coincides with the center corresponding to the outer edge of the punching sheet body; Perform a cross-section of the punching sheet body along the axis perpendicular to the rotor punching sheet. In the cross-section, the contour line of the mounting hole is a closed curve connected end to end, and the contour line of the outer edge of the punching sheet body is a closed curve connected end to end.

9. The rotor punching sheet according to any one of claims 1 to 3, characterized in that The width of the fixing protrusion in the circumferential direction of the rotor punching sheet is denoted as w 1 , the length of the fixing protrusion in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is denoted as b 1 , the number of the fixing protrusions is denoted as m 1 , the width of the connecting portion in the circumferential direction of the rotor punching sheet is denoted as w 2 , the length of the connecting portion in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is denoted as b 2 , the number of the connecting portions is denoted as m 2 , the depth of the mounting groove in the direction from the mounting hole to the outer peripheral wall of the punching sheet body is denoted as W m , the distance from the center of the mounting hole to the outer peripheral wall of the annular portion is denoted as R 4 ; where, w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 <π×((R 1 -W m ) 2 -R 4 2 ),w 1 ×b 1 ×m 1 +w 2 ×b 2 ×m 2 <π×((R 2 -W m ) 2 -R 4 2 )。 10. The rotor punching sheet according to claim 9, characterized in that m 1 and p satisfy: m 1 = 2 × p; m 2 and p satisfy: m 2 = p, or m 2 = 2 × p.

11. The rotor punching sheet according to any one of claims 1 to 3, characterized in that 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 , where H 1 ×(H 1 +2×R 0 ) < R 1 2 -R 0 2 , H 1 ×(H 1 +2×R 0 ) < R 2 2 -R 0 2 .

12. A rotor, characterized in that comprising: a rotor core, the rotor core is formed by stacking a plurality of rotor punching sheets according to any one of claims 1 to 11, and the mounting grooves of the plurality of rotor punching sheets penetrate along the axis of the rotor core to form slot holes; a plurality of permanent magnets, and one permanent magnet is arranged in each slot hole.

13. The rotor according to claim 12, characterized in that in the rotor punching sheet, the part of the isolation groove located between two adjacent connecting parts is a sub-groove; the plurality of rotor punching sheets include a first rotor punching sheet and a second rotor punching sheet, the sub-groove of the first rotor punching sheet is arranged opposite to the connecting part of the second rotor punching sheet, and the connecting part of the first rotor punching sheet and the sub-groove of the second rotor punching sheet are arranged opposite to each other.

14. The rotor according to claim 13, characterized in that the number of the first rotor punching sheets and the second rotor punching sheets are both multiple; 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.

15. An electric motor, characterized in that comprising: a rotor according to any one of claims 12 to 14.

16. A chassis system, characterized in that comprising: a rotor according to any one of claims 12 to 14; or an electric motor according to claim 15.

17. A vehicle, characterized in that comprising: a rotor according to any one of claims 12 to 14; or an electric motor according to claim 15; or a chassis system according to claim 16.

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