Motor, chassis system and vehicle

Abstract

The invention provides a motor, a chassis system and a vehicle. The motor comprises: a stator core; the rotor iron core is rotatably connected with the stator iron core, the rotor iron core is provided with a mounting hole and a plurality of magnet grooves, and the plurality of magnet grooves are arranged around the mounting hole at intervals; in the axial direction of the stator core, the height of the stator core is marked as H1, and the height of the rotor core is marked as H2; the width of each magnet groove in the circumferential direction of the rotor iron core is marked as Lm, the depth of each magnet groove in the direction from the mounting hole to the outer circumferential wall of the rotor iron core is marked as Wm, and the distance from the center of the mounting hole to the outer circumferential wall of the rotor iron core is marked as R1; wherein H1-H2 * (Wm + Lm) < pi * R1 * (H1 + H2).

Description

Technical Field

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

[0002] In the related art, the end leakage magnetic field of the motor is serious, which affects the output torque and torque ripple of the motor, and deteriorates the mechanical vibration and noise of the motor. Summary of the Invention

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

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

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

[0006] A third aspect of the present application provides a vehicle.

[0007] In view of this, a first aspect of the present application provides a motor, including: a stator core; a rotor core, rotatably connected to the stator core, the rotor core being provided with a mounting hole and a plurality of magnet slots, the plurality of magnet slots being arranged at intervals around the mounting hole; along the axial direction of the stator core, the height of the stator core is denoted as H1, and the height of the rotor core is denoted as H2; the width of the magnet slot in the circumferential direction of the rotor core is denoted as Lm, the depth of the magnet slot in the direction from the mounting hole to the outer peripheral wall of the rotor core is denoted as Wm, and the distance from the center of the mounting hole to the outer peripheral wall of the rotor core is denoted as R1; wherein, |H1 - H2|×(Wm + Lm) < π×R1×(H1 + H2).

[0008] A motor provided by the present application includes a stator core and a rotor core.

[0009] The rotor core is rotatably connected to the stator core, that is, the rotor core can rotate relative to the stator core.

[0010] The rotor core is provided with a mounting hole and a plurality of magnet slots, the plurality of magnet slots being arranged at intervals around the mounting hole, and the magnet slots are used for mounting and fixing permanent magnets. It can be understood that along the axial direction of the rotor core, the mounting hole penetrates the rotor core, and the magnet slots penetrate the rotor core.

[0011] The present application reasonably sets the matching structure of the stator core and the rotor core. Specifically, along the axial direction of the stator core, the height of the stator core is denoted as H1, and the height of the rotor core is denoted as H2. That is, the axial height of the stator core is H1, and the axial height of the rotor core is H2. Along the circumferential direction of the rotor core, the width of the magnet slot is Lm. Along the direction from the mounting hole to the outer peripheral wall of the rotor core, the depth of the magnet slot is Wm, and the distance from the center of the mounting hole to the outer peripheral wall of the rotor core is R1. And the relationship among H1, H2, Wm, Lm and R1 is defined to satisfy: |H1 - H2|×(Wm + Lm) < π×R1×(H1 + H2). That is, the axial heights of the stator core and the rotor core are different. In other words, after the stator core and the rotor core are assembled, there is a height difference between the stator core and the rotor core in the axial direction of the stator core. In this way, the problem of end leakage magnetic field of the motor can be improved, the torque is increased, the torque ripple is suppressed, which is beneficial to reducing the vibration and noise of the motor and improving the service performance and market competitiveness of the product.

[0012] It can be understood that along the axial direction of the stator core, the rotor core has a first end face and a second end face, and the stator core has a third end face and a fourth end face. The third end face is located at the first end face, and the fourth end face is located at the second end face. There is a height difference between the first end face and the third end face, and / or there is a height difference between the second end face and the fourth end face.

[0013] Optionally, the stator core is provided with a first installation cavity, the rotor core is arranged in the first installation cavity, and the rotor core is rotatably connected with the stator core.

[0014] Optionally, the rotor core is provided with a second installation cavity, the stator core is arranged in the second installation cavity, and the rotor core is rotatably connected with the stator core.

[0015] It can be understood that when the rotor core is sectioned along the direction perpendicular to its axial direction, in the section, the contour line of the magnet slot includes a first line segment and a second line segment, and the first line segment and the second line segment are arranged at intervals along the circumferential direction of the rotor core. The point on the first line segment is denoted as the first point, and along the circumferential direction of the rotor core, the point on the second line segment opposite to the first point is denoted as the second point, and the distance from the first point to the second point is denoted as Lm.

[0016] It can be understood that when the rotor core is sectioned along the direction perpendicular to its axial direction, in the section, the contour line of the magnet slot includes a third line segment and a slot opening, and the third line segment and the slot opening are arranged at intervals along the direction from the mounting hole to the outer peripheral wall of the rotor core. 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 rotor core, the point on the slot opening opposite to the third point is denoted as the fourth point, and the distance from the third point to the fourth point is denoted as Wm.

[0017] It can be understood that when the motor is of an inner rotor structure, the mounting hole is used to accommodate the rotating shaft of the motor. When the motor is of an outer rotor structure, the mounting hole is used to accommodate the stator.

[0018] According to the motor described above in the present application, it may further have the following additional technical features:

[0019] In some embodiments, optionally, H1, H2, Wm, Lm, and R1 satisfy: 0 < (|H1 - H2| × (Wm + Lm)) / (π × R1 × (H1 + H2)) ≤ 0.1.

[0020] In this embodiment, the matching structure of the stator core and the rotor core is further defined. The relationship between H1, H2, Wm, Lm, and R1 is defined to satisfy: 0 < (|H1 - H2| × (Wm + Lm)) / (π × R1 × (H1 + H2)) ≤ 0.1.

[0021] This setting further defines the axial height relationship between the stator core and the rotor core. After the stator core and the rotor core are assembled, in the axial direction of the stator core, there is a height difference between the stator core and the rotor core. In this way, the problem of end leakage magnetic flux of the motor can be improved, the torque is increased, the torque ripple is suppressed, which is beneficial to reducing the vibration and noise of the motor, and improving the use performance and market competitiveness of the product.

[0022] Optionally, (|H1 - H2| × (Wm + Lm)) / (π × R1 × (H1 + H2)) = 0.09, (|H1 - H2| × (Wm + Lm)) / (π × R1 × (H1 + H2)) = 0.08, (|H1 - H2| × (Wm + Lm)) / (π × R1 × (H1 + H2)) = 0.07, and (|H1 - H2| × (Wm + Lm)) / (π × R1 × (H1 + H2)) = 0.06, etc., which are not listed one by one here.

[0023] In some embodiments, optionally, H1, H2, Wm, Lm, and R1 satisfy: 0 < (|H1 - H2| × (Wm + Lm)) / (π × R1 × (H1 + H2)) ≤ 0.05.

[0024] In this embodiment, the matching structure of the stator core and the rotor core is further defined. The relationship between H1, H2, Wm, Lm, and R1 is defined to satisfy: 0 < (|H1 - H2| × (Wm + Lm)) / (π × R1 × (H1 + H2)) ≤ 0.05.

[0025] This setting further defines the axial height relationship between the stator core and the rotor core. After the stator core and the rotor core are assembled, there is a height difference between the stator core and the rotor core in the axial direction of the stator core. In this way, the problem of end leakage flux of the motor can be improved, the torque is increased, the torque ripple is suppressed, which is beneficial to reducing the vibration and noise of the motor and enhancing the service performance and market competitiveness of the product.

[0026] Optionally, (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) = 0.04, (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) = 0.03, (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) = 0.02, (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) = 0.01, etc., which are not listed one by one here.

[0027] In some embodiments, optionally, along the direction from the mounting hole to the outer peripheral wall of the rotor core, the minimum value of the air gap between the stator core and the rotor core is denoted as lg, where 0 < (2×π×lg) / (H1 + H2) ≤ 0.5.

[0028] In this embodiment, the mating structure of the rotor core and the stator core is further defined, so that along the direction from the mounting hole to the outer peripheral wall of the rotor core, the minimum value of the air gap between the stator core and the rotor core is lg, and the relationship between lg, H1 and H2 is defined to satisfy 0 < (2×π×lg) / (H1 + H2) ≤ 0.5. In this way, while ensuring the effectiveness and feasibility of the rotational connection between the stator core and the rotor core, a better torque can be obtained and the torque ripple will be suppressed.

[0029] If (2×π×lg) / (H1 + H2) > 0.5, the torque will decrease and the requirements for the service performance of the motor cannot be met.

[0030] Optionally, (2×π×lg) / (H1 + H2) = 0.4, (2×π×lg) / (H1 + H2) = 0.3, (2×π×lg) / (H1 + H2) = 0.2, etc., which are not listed one by one here.

[0031] Optionally, when the motor is an inner rotor structure, the motor is sectioned along the axial direction perpendicular to the rotor core. In the section, the point on the outer contour line of the rotor core is denoted as the fifth point, and along the direction from the mounting hole to the outer peripheral wall of the rotor core, the point on the inner peripheral wall contour line of the stator core 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 lg.

[0032] In some embodiments, optionally, the central axis of the stator core coincides with the center of the mounting hole.

[0033] In this embodiment, the mating structure of the rotor core and the stator core is further defined such that the central axis of the stator core coincides with the center of the mounting hole. In this way, the rotor core can rotate effectively relative to the stator core, avoiding interference between the rotor core and the stator core, and providing a reliable structural support for ensuring the effective operation of the motor.

[0034] In some embodiments, optionally, the rotor core includes: m rotor punching sheets, the m rotor punching sheets are stacked, and either the mounting hole or the magnet slot penetrates through the m rotor punching sheets; in at least a part of the m rotor punching sheets, the part of the rotor punching sheet located between the magnet slot and the outer peripheral wall of the rotor punching sheet is an outer magnetic bridge; the number of outer magnetic bridges on the i-th rotor punching sheet is denoted as Ni, where i ≤ m; among them, p is the number of pole pairs of the motor.

[0035] In this embodiment, the structure of the rotor core is further defined. The rotor core includes m rotor punching sheets, and the rotor punching sheets are stacked.

[0036] Either the mounting hole or the magnet slot penetrates through the m rotor punching sheets, that is, the mounting hole penetrates through the m rotor punching sheets, and the magnet slot penetrates through the m rotor punching sheets.

[0037] Among them, in at least a part of the m rotor punching sheets, the mounting groove is arranged at an interval from the outer peripheral wall of the rotor punching sheet, and the part of the rotor punching sheet located between the magnet slot and the outer peripheral wall of the rotor punching sheet is an outer magnetic bridge.

[0038] For example, the number of outer magnetic bridges on the first rotor punching sheet is denoted as N1, the number of outer magnetic bridges on the second rotor punching sheet is denoted as N2, the number of outer magnetic bridges on the third rotor punching sheet is denoted as N3,..., and the number of outer magnetic bridges on the i-th rotor punching sheet is denoted as Ni. Among them, i ≤ m.

[0039] And the relationship between Ni and the number of pole pairs p of the motor is defined to satisfy: In this way, the relationship between the number of outer magnetic bridges and the number of permanent magnets located in the magnet slots can be ensured, so that any one of the multiple magnet slots can have at least one outer magnetic bridge to cooperate with it. In this way, the permanent magnets can be effectively limited in position, avoiding the displacement of the permanent magnets, ensuring the running stability of the rotor core, and reducing the running noise of the motor.

[0040] It can be understood that by rotating the installation angle of at least a part of the m rotor punching sheets, any one of the multiple magnet slots can have at least one outer magnetic bridge to cooperate with it.

[0041] It can be understood that, in at least a part of the m rotor laminations, the part of the rotor lamination located between the mounting groove and the outer peripheral wall of the rotor lamination is the outer magnetic bridge. A part of the m rotor laminations has an outer magnetic bridge. Or any one of the multiple rotor laminations has an outer magnetic bridge.

[0042] In some embodiments, optionally, the rotor core includes: m rotor laminations, which are stacked; in at least a part of the m rotor laminations, the rotor lamination includes: an annular part, the inner peripheral walls of the m annular parts penetrate along the axial direction of the rotor core to form a mounting hole; a lamination body, the lamination body is arranged along the circumferential direction of the annular part, the lamination body is arranged at an interval from the annular part, the lamination body is provided with a mounting groove, and the mounting grooves of the m rotor laminations penetrate along the axial direction of the rotor core to form a magnet groove; a connecting part, the outer peripheral wall of the annular part and the lamination body are connected through the connecting part; the number of connecting parts on the i-th rotor lamination is denoted as Ai, i ≤ m; where, p is the number of pole pairs of the motor.

[0043] In this embodiment, the structure of the rotor core is further defined. The rotor core includes m rotor laminations, and the rotor laminations are stacked.

[0044] In at least a part of the m rotor laminations, the rotor lamination includes an annular part, a lamination body and a connecting part. Wherein, the inner peripheral walls of the m annular parts penetrate along the axial direction of the rotor core to form a mounting hole. The lamination body is provided with a mounting groove, and the mounting groove penetrates along the axial direction of the rotor core to form a magnet groove. The lamination body is arranged at an interval from the annular part, and the outer peripheral wall of the annular part and the lamination body are connected through the connecting part.

[0045] For example, the number of connecting parts on the first rotor lamination is denoted as A1, the number of connecting parts on the second rotor lamination is denoted as A2, the number of connecting parts on the third rotor lamination is denoted as A3,..., and the number of connecting parts on the i-th rotor lamination is denoted as Ai. Wherein, i ≤ m.

[0046] And the relationship between Ai and the number of pole pairs p of the motor is defined to satisfy: In this way, the area of the connection region between the annular part and the lamination body is ensured, the strength of the rotor core can be improved, the occurrence probability of deformation of the rotor core can be reduced, and the stability and reliability of the motor operation can be ensured.

[0047] It can be understood that, in at least a part of the m rotor laminations, the rotor lamination includes an annular part, a lamination body and a connecting part. A part of the m rotor laminations includes an annular part, a lamination body and a connecting part. Or any one of the multiple rotor laminations includes an annular part, a lamination body and a connecting part.

[0048] In some embodiments, optionally, the punching sheet body includes: a plurality of first magnetic pole portions, the plurality of first magnetic pole portions are arranged at intervals along the circumferential direction of the annular portion, any one of the plurality of first magnetic pole portions includes a magnetic pole body, a first limiting section and a second limiting section, the magnetic pole body of the first magnetic pole portion is connected to the outer peripheral wall of the annular portion through a connecting portion, along the circumferential direction of the rotor core, the magnetic pole body is connected between the first limiting section and the second limiting section, and any one of the first limiting section and the second limiting section is arranged away from the annular portion; wherein, an installation groove is defined by two adjacent first magnetic pole portions.

[0049] In this embodiment, the structure of the punching sheet body is further defined such that the punching sheet body includes a plurality of first magnetic pole portions, and the plurality of first magnetic pole portions are arranged at intervals along the circumferential direction of the annular portion.

[0050] Any one of the plurality of first magnetic pole portions includes a magnetic pole body, a first limiting section and a second limiting section. The magnetic pole body of the first magnetic pole portion is connected to the outer peripheral wall of the annular portion through a connecting portion. Along the circumferential direction of the rotor core, the magnetic pole body is connected between the first limiting section and the second limiting section, and any one of the first limiting section and the second limiting section is arranged away from the annular portion. It can also be said that two adjacent first magnetic pole portions cooperate to limit the permanent magnet in multiple directions together, avoiding the situation of permanent magnet displacement, ensuring the running stability of the rotor core, and reducing the running noise of the motor.

[0051] It can be understood that the first limiting section and the second limiting section cooperate to limit the permanent magnet along the direction from the installation hole to the outer peripheral wall of the rotor core.

[0052] It can be understood that the first limiting sections and the second limiting sections of two adjacent first magnetic pole portions are arranged at intervals. In this way, the magnetic field generated by the permanent magnet can form a closed loop through the rotor core as fully as possible, suppressing the formation of magnetic leakage paths between the first limiting section and the second limiting section, further improving magnetic leakage, and enhancing the power density of the motor.

[0053] In some embodiments, optionally, the punching sheet body includes: a plurality of second magnetic pole portions, the plurality of second magnetic pole portions are arranged at intervals along the circumferential direction of the annular portion; an installation groove is provided between two adjacent second magnetic pole portions; the part of the punching sheet body between the installation groove and the outer peripheral wall of the punching sheet body is an outer magnetic bridge, and any two adjacent second magnetic pole portions are connected through an outer magnetic bridge; at least a part of the plurality of second magnetic pole portions is connected to the outer peripheral wall of the annular portion through a connecting portion.

[0054] In this embodiment, the structure of the punching sheet body is further defined such that the punching sheet body includes a plurality of second magnetic pole portions, and the part of the punching sheet body between the installation groove and the outer peripheral wall of the punching sheet body is an outer magnetic bridge. The plurality of second magnetic pole portions are arranged at intervals along the circumferential direction of the annular portion, and any two adjacent second magnetic pole portions are connected through an outer magnetic bridge.

[0055] It can be understood that an installation groove is defined by two adjacent second magnetic pole portions and the outer magnetic bridge. It can be understood that the outer magnetic bridge forms the bottom of the installation groove, and two adjacent second magnetic pole portions form the side walls and the opening of the installation groove. This arrangement can enhance the structural strength of the punching sheet body, and thus enhance the structural strength of the rotor core, reduce the probability of deformation of the rotor core, and ensure the stability and reliability of the motor operation.

[0056] Optionally, any one of the plurality of second magnetic pole portions is connected to the outer peripheral wall of the annular portion through a connecting portion.

[0057] Optionally, a part of the plurality of second magnetic pole portions is connected to the outer peripheral wall of the annular portion through a connecting portion.

[0058] In some embodiments, optionally, the rotor core includes: m rotor punching sheets, which are stacked; in at least a part of the m rotor punching sheets, the rotor punching sheet includes: an annular portion, the inner peripheral walls of the m annular portions penetrate along the axial direction of the rotor core to form a mounting hole, and a positioning protrusion is provided on the outer peripheral wall of the annular portion; a punching sheet body, the punching sheet body is arranged along the circumferential direction of the annular portion, the punching sheet body is arranged at an interval from the annular portion, the punching sheet body is provided with an installation groove, and the installation grooves of the m rotor punching sheets penetrate along the axial direction of the rotor core to form a magnet groove, and the positioning protrusion is arranged opposite to the installation groove; the number of positioning protrusions on the i-th rotor punching sheet is denoted as Bi, where i ≤ m; among them, p is the number of pole pairs of the motor.

[0059] In this embodiment, the structure of the rotor core is further defined such that the rotor core includes m rotor punching sheets, which are stacked.

[0060] In at least a part of the m rotor punching sheets, the rotor punching sheet includes an annular portion and a punching sheet body. The punching sheet body is arranged along the circumferential direction of the annular portion, and the punching sheet body is arranged at an interval from the annular portion. The inner peripheral walls of the m annular portions penetrate along the axial direction of the rotor core to form a mounting hole. The punching sheet body is provided with an installation groove, and the installation groove penetrates along the axial direction of the rotor core to form a magnet groove.

[0061] The positioning protrusion is arranged opposite to the installation groove, and the positioning protrusion has the function of restricting the displacement of the permanent magnet in the magnet groove. In this way, the matching dimensions between the permanent magnet and the rotating shaft can be ensured, providing a reliable structural support for the effectiveness and feasibility of the motor operation.

[0062] For example, the number of positioning protrusions on the first rotor punching sheet is denoted as B1, the number of positioning protrusions on the second rotor punching sheet is denoted as B2, the number of positioning protrusions on the third rotor punching sheet is denoted as B3, …, and the number of positioning protrusions on the i-th rotor punching sheet is denoted as Bi. Among them, i ≤ m.

[0063] And define the relationship between Bi and the number of pole pairs p of the motor to satisfy: In this way, it is possible to ensure the relationship between the number of positioning protrusions and the number of permanent magnets located in the magnet slots, so that any one of the multiple magnet slots can have at least one positioning protrusion to cooperate with it. In this way, the permanent magnets can be effectively limited in position, avoiding the displacement of the permanent magnets, ensuring the running stability of the rotor core, and reducing the running noise of the motor.

[0064] It can be understood that the installation angle of at least a part of the m rotor punching sheets can be rotated so that any one of the multiple magnet slots can have at least one positioning protrusion to cooperate with it.

[0065] It can be understood that among at least a part of the m rotor punching sheets, the rotor punching sheet includes an annular portion and a punching sheet body. A part of the m rotor punching sheets includes an annular portion and a punching sheet body. Alternatively, any one of the multiple rotor punching sheets includes an annular portion and a punching sheet body.

[0066] In some embodiments, optionally, the rotor core includes: m rotor punching sheets, the m rotor punching sheets are stacked, at least a part of the m rotor punching sheets includes an annular portion, the inner peripheral wall of the annular portion forms a part of the hole wall of the mounting hole, and the magnet slots are located on one side of the inner peripheral wall of the annular portion; the number of the annular portions is denoted as C, where C ≥ 0.25×m.

[0067] In this embodiment, the structure of the rotor core is further defined such that the rotor core includes m rotor punching sheets, and the m rotor punching sheets are stacked.

[0068] At least a part of the m rotor punching sheets includes an annular portion, the inner peripheral wall of the annular portion forms a part of the hole wall of the mounting hole, and the magnet slots are located on one side of the inner peripheral wall of the annular portion. This setting can ensure the mating area between the rotor core and the rotating shaft of the motor, providing structural support for ensuring the effective operation of the motor.

[0069] It can be understood that the magnet slots are arranged at intervals from the inner peripheral wall of the annular portion.

[0070] It can be understood that at least a part of the m rotor punching sheets includes an annular portion. A part of the m rotor punching sheets includes an annular portion. Alternatively, any one of the multiple rotor punching sheets includes an annular portion.

[0071] The second aspect of the present invention proposes a chassis system, including: the motor as in the first aspect.

[0072] The chassis system provided by the present invention includes the motor as in the first aspect, and therefore has all the beneficial effects of the above motor, which will not be elaborated one by one here.

[0073] A third aspect of the present invention provides a vehicle, comprising: an electric motor as in the first aspect; or a chassis system as in the second aspect.

[0074] Since the vehicle provided by the present invention includes an electric motor as in the first aspect or a chassis system as in the second aspect, it has all the beneficial effects of one of the above-mentioned electric motors and chassis systems, which will not be elaborated one by one herein.

[0075] It should be noted that the vehicle can be a new energy vehicle. New energy vehicles include battery electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0076] 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

[0077] 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, where:

[0078] Figure 1 FIG. 1 shows a schematic structural view of a first part of an electric motor according to an embodiment of the present application;

[0079] Figure 2 FIG. 1 shows a schematic structural view of a first part of an electric motor according to an embodiment of the present application;

[0080] Figure 3 FIG. 2 shows a schematic structural view of a rotor punching sheet according to a first embodiment of the present application;

[0081] Figure 4 FIG. 3 shows a schematic structural view of a rotor punching sheet according to a second embodiment of the present application;

[0082] Figure 5 FIG. 4 shows a schematic structural view of a rotor punching sheet according to a third embodiment of the present application;

[0083] Figure 6 FIG. 5 shows a schematic structural view of a rotor punching sheet according to a fourth embodiment of the present application;

[0084] Figure 7 FIG. 6 shows a schematic structural view of a rotor punching sheet according to a fifth embodiment of the present application;

[0085] Figure 8 FIG. 7 shows a schematic structural view of a rotor punching sheet according to a sixth embodiment of the present application;

[0086] Figure 9 FIG. 8 shows a schematic structural view of a rotor punching sheet according to a seventh embodiment of the present application;

[0087] Figure 10Shows a schematic structural diagram of a rotor punching sheet according to the eighth embodiment of the present application;

[0088] Figure 11 Shows a data curve graph of the output torque and cost of the present application varying with the change of X;

[0089] Figure 12 Shows a data curve graph of the torque ripple of the present application varying with the change of X.

[0090] Among them, Figures 1 to 10 The corresponding relationship between the reference numerals and component names in the

[0091] 1 is a motor, 10 is a stator core, 110 is a first mounting cavity, 120 is a stator tooth, 130 is a stator yoke, 20 is a rotor core, 200 is a mounting hole, 300 is a magnet slot, 400 is a rotor punching sheet, 410 is an outer magnetic bridge, 420 is an annular part, 430 is a punching sheet body, 432 is a mounting groove, 434 is a first magnetic pole part, 4342 is a magnetic pole body, 4344 is a first limiting section, 4346 is a second limiting section, 436 is a second magnetic pole part, 440 is a connecting part, 450 is a positioning protrusion. Detailed implementation manners

[0092] 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.

[0093] Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can 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.

[0094] The following refers to Figures 1 to 12 A motor 1, a chassis system and a vehicle according to some embodiments of the present application.

[0095] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 And Figure 7 Shown, a motor 1 according to some embodiments of the present application includes a stator core 10 and a rotor core 20.

[0096] The rotor core 20 is rotatably connected to the stator core 10.

[0097] The rotor core 20 is provided with a mounting hole 200 and a plurality of magnet slots 300.

[0098] A plurality of magnet slots 300 are arranged at intervals around the mounting hole 200.

[0099] Along the axial direction of the stator core 10, the height of the stator core 10 is denoted as H1, and the height of the rotor core 20 is denoted as H2.

[0100] The width of the magnet slot 300 in the circumferential direction of the rotor core 20 is denoted as Lm.

[0101] The depth of the magnet slot 300 in the direction from the mounting hole 200 to the outer peripheral wall of the rotor core 20 is denoted as Wm.

[0102] The distance from the center of the mounting hole 200 to the outer peripheral wall of the rotor core 20 is denoted as R1.

[0103] Wherein, |H1 - H2|×(Wm + Lm) < π×R1×(H1 + H2).

[0104] An electric machine 1 provided by the present application includes a stator core 10 and a rotor core 20.

[0105] The rotor core 20 is rotatably connected to the stator core 10, that is, the rotor core 20 can rotate relative to the stator core 10.

[0106] The rotor core 20 is provided with a mounting hole 200 and a plurality of magnet slots 300. The plurality of magnet slots 300 are arranged at intervals around the mounting hole 200, and the magnet slots 300 are used for mounting and fixing permanent magnets. It can be understood that along the axial direction of the rotor core 20, the mounting hole 200 penetrates through the rotor core 20, and the magnet slots 300 penetrate through the rotor core 20.

[0107] The present application reasonably sets the matching structure of the stator core 10 and the rotor core 20. Specifically, along the axial direction of the stator core 10, the height of the stator core 10 is denoted as H1, and the height of the rotor core 20 is denoted as H2. That is, the axial height of the stator core 10 is H1, and the axial height of the rotor core 20 is H2. Along the circumferential direction of the rotor core 20, the width of the magnet slot 300 is Lm. Along the direction from the mounting hole 200 to the outer peripheral wall of the rotor core 20, the depth of the magnet slot 300 is Wm, and the distance from the center of the mounting hole 200 to the outer peripheral wall of the rotor core 20 is R1. And the relationship among H1, H2, Wm, Lm and R1 is defined to satisfy: |H1 - H2|×(Wm + Lm) < π×R1×(H1 + H2). That is, the axial heights of the stator core 10 and the rotor core 20 are different. It can also be said that after the stator core 10 and the rotor core 20 are assembled, in the axial direction of the stator core 10, there is a height difference between the stator core 10 and the rotor core 20. In this way, the problem of end leakage magnetic flux of the electric machine 1 can be improved, the torque is increased, the torque ripple is suppressed, which is beneficial to reducing the vibration and noise of the electric machine 1, and the use performance and market competitiveness of the product are improved.

[0108] It can be understood that along the axial direction of the stator core 10, the rotor core 20 has a first end face and a second end face, and the stator core 10 has a third end face and a fourth end face. The third end face is located at the first end face, and the fourth end face is located at the second end face. There is a height difference between the first end face and the third end face, and / or there is a height difference between the second end face and the fourth end face.

[0109] Optionally, the stator core 10 is provided with a first installation cavity 110, the rotor core 20 is arranged in the first installation cavity 110, and the rotor core 20 is rotatably connected to the stator core 10.

[0110] Optionally, the rotor core 20 is provided with a second installation cavity, the stator core 10 is arranged in the second installation cavity, and the rotor core 20 is rotatably connected to the stator core 10.

[0111] It can be understood that when the rotor core 20 is sectioned along the axial direction perpendicular to the rotor core 20, in the section, the contour line of the magnet slot 300 includes a first line segment and a second line segment, and the first line segment and the second line segment are arranged at intervals along the circumferential direction of the rotor core 20. The point on the first line segment is denoted as the first point, and along the circumferential direction of the rotor core 20, the point on the second line segment opposite to the first point is denoted as the second point, and the distance from the first point to the second point is denoted as Lm.

[0112] It can be understood that when the rotor core 20 is sectioned along the axial direction perpendicular to the rotor core 20, in the section, the contour line of the magnet slot 300 includes a third line segment and a notch, and the third line segment and the notch are arranged at intervals along the direction from the mounting hole 200 to the outer peripheral wall of the rotor core 20. The point on the third line segment is denoted as the third point, and along the direction from the mounting hole 200 to the outer peripheral wall of the rotor core 20, the point on the notch opposite to the third point is denoted as the fourth point, and the distance from the third point to the fourth point is denoted as Wm.

[0113] In some embodiments, optionally, H1, H2, Wm, Lm, and R1 satisfy: 0 < (|H1 - H2| × (Wm + Lm)) / (π × R1 × (H1 + H2)) ≤ 0.1.

[0114] In this embodiment, the mating structure of the stator core 10 and the rotor core 20 is further defined. The relationship between H1, H2, Wm, Lm, and R1 is defined to satisfy: 0 < (|H1 - H2| × (Wm + Lm)) / (π × R1 × (H1 + H2)) ≤ 0.1.

[0115] This setting further defines the axial height relationship between the stator core 10 and the rotor core 20, such that after the stator core 10 and the rotor core 20 are assembled, there is a height difference between the stator core 10 and the rotor core 20 in the axial direction of the stator core 10. In this way, the problem of end leakage magnetic flux of the motor 1 can be improved, the torque is increased, the torque ripple is suppressed, which is beneficial to reducing the vibration and noise of the motor 1, and the service performance and market competitiveness of the product are enhanced.

[0116] Optionally, (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) = 0.09, (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) = 0.08, (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) = 0.07, and (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) = 0.06, etc., which are not listed one by one here.

[0117] In some embodiments, optionally, H1, H2, Wm, Lm, and R1 satisfy: 0 < (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) ≤ 0.05.

[0118] In this embodiment, the mating structure of the stator core 10 and the rotor core 20 is further defined. The relationship of H1, H2, Wm, Lm, and R1 is defined to satisfy: 0 < (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) ≤ 0.05.

[0119] This setting further defines the axial height relationship between the stator core 10 and the rotor core 20, such that after the stator core 10 and the rotor core 20 are assembled, there is a height difference between the stator core 10 and the rotor core 20 in the axial direction of the stator core 10. In this way, the problem of end leakage magnetic flux of the motor 1 can be improved, the torque is increased, the torque ripple is suppressed, which is beneficial to reducing the vibration and noise of the motor 1, and the service performance and market competitiveness of the product are enhanced.

[0120] Optionally, (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) = 0.04, (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) = 0.03, (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) = 0.02, and (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) = 0.01, etc., which are not listed one by one here.

[0121] In some embodiments, optionally, such as Figure 1 and Figure 2As shown, along the installation hole 200 to the outer peripheral wall of the rotor core 20, the minimum value of the air gap between the stator core 10 and the rotor core 20 is denoted as lg.

[0122] Among them, 0 < (2×π×lg) / (H1 + H2) ≤ 0.5.

[0123] In this embodiment, the mating structure of the rotor core 20 and the stator core 10 is further defined such that along the direction from the installation hole 200 to the outer peripheral wall of the rotor core 20, the minimum value of the air gap between the stator core 10 and the rotor core 20 is lg, and the relationship between lg, H1, and H2 is defined to satisfy 0 < (2×π×lg) / (H1 + H2) ≤ 0.5. In this way, while ensuring the effectiveness and feasibility of the rotational connection between the stator core 10 and the rotor core 20, a relatively optimal torque can be obtained, and torque ripple will be suppressed.

[0124] If (2×π×lg) / (H1 + H2) > 0.5, the torque will decrease and cannot meet the requirements of the operating performance of the motor 1.

[0125] Optionally, (2×π×lg) / (H1 + H2) = 0.4, (2×π×lg) / (H1 + H2) = 0.3, (2×π×lg) / (H1 + H2) = 0.2, etc., which are not listed one by one here.

[0126] Optionally, when the motor 1 is an inner rotor structure, the motor 1 is sectioned along the axis perpendicular to the rotor core 20. In the section, the point on the outer contour line of the rotor core 20 is denoted as the fifth point, and along the direction from the installation hole 200 to the outer peripheral wall of the rotor core 20, the point on the contour line of the inner peripheral wall of the stator core 10 that is 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 lg.

[0127] In some embodiments, optionally, the central axis of the stator core 10 coincides with the center of the installation hole 200.

[0128] In this embodiment, the mating structure of the rotor core 20 and the stator core 10 is further defined such that the central axis of the stator core 10 coincides with the center of the installation hole 200. In this way, the rotor core 20 can rotate effectively relative to the stator core 10, avoiding interference between the rotor core 20 and the stator core 10, and providing a reliable structural support for ensuring the effective operation of the motor 1.

[0129] In some embodiments, optionally, as Figure 3 、 Figure 4 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 shown, the rotor core 20 includes m rotor laminations 400.

[0130] m rotor punching sheets 400 are stacked.

[0131] Either the mounting holes 200 or the magnet grooves 300 penetrate through the m rotor punching sheets 400.

[0132] In at least a part of the m rotor punching sheets 400, the part of the rotor punching sheet 400 located between the magnet groove 300 and the outer peripheral wall of the rotor punching sheet 400 is the outer magnetic bridge 410.

[0133] The number of the outer magnetic bridges 410 on the i-th rotor punching sheet 400 is denoted as Ni, where i ≤ m.

[0134] Among them, p is the number of pole pairs of the motor 1.

[0135] In this embodiment, the structure of the rotor core 20 is further defined. The rotor core 20 includes m rotor punching sheets 400, and the rotor punching sheets 400 are stacked.

[0136] Either the mounting holes 200 or the magnet grooves 300 penetrate through the m rotor punching sheets 400, that is, the mounting holes 200 penetrate through the m rotor punching sheets 400, and the magnet grooves 300 penetrate through the m rotor punching sheets 400.

[0137] Among them, in at least a part of the m rotor punching sheets 400, the mounting grooves 432 are arranged at intervals with the outer peripheral wall of the rotor punching sheet 400, and the part of the rotor punching sheet 400 located between the magnet groove 300 and the outer peripheral wall of the rotor punching sheet 400 is the outer magnetic bridge 410.

[0138] For example, the number of the outer magnetic bridges 410 on the first rotor punching sheet 400 is denoted as N1, the number of the outer magnetic bridges 410 on the second rotor punching sheet 400 is denoted as N2, the number of the outer magnetic bridges 410 on the third rotor punching sheet 400 is denoted as N3,..., and the number of the outer magnetic bridges 410 on the i-th rotor punching sheet 400 is denoted as Ni. Among them, i ≤ m.

[0139] And the relationship between Ni and the number of pole pairs p of the motor 1 is defined to satisfy: In this way, it can ensure the relationship between the number of the outer magnetic bridges 410 and the number of the permanent magnets located in the magnet grooves 300, so that any one of the multiple magnet grooves 300 can have at least one outer magnetic bridge 410 to cooperate with it. In this way, it can effectively limit the permanent magnets, avoid the displacement of the permanent magnets, ensure the running stability of the rotor core 20, and reduce the running noise of the motor 1.

[0140] It can be understood that the installation angle of at least a part of the m rotor laminations 400 can be rotated so that any one of the multiple magnet slots 300 can have at least one external magnetic bridge 410 to cooperate with it.

[0141] It can be understood that in at least a part of the m rotor laminations 400, the part of the rotor lamination 400 between the installation groove 432 and the outer peripheral wall of the rotor lamination 400 is the external magnetic bridge 410. A part of the m rotor laminations 400 has an external magnetic bridge 410. Or any one of the multiple rotor laminations 400 has an external magnetic bridge 410.

[0142] In some embodiments, optionally, as Figure 3 , Figure 5 , Figure 6 , Figure 8 , Figure 9 and Figure 10 shown, the rotor core 20 includes m rotor laminations 400.

[0143] The m rotor laminations 400 are stacked.

[0144] In at least a part of the m rotor laminations 400, the rotor lamination 400 includes an annular portion 420, a lamination body 430, and a connecting portion 440.

[0145] The inner peripheral walls of the m annular portions 420 penetrate axially along the rotor core 20 to form an installation hole 200.

[0146] The lamination body 430 is arranged circumferentially along the annular portion 420.

[0147] The lamination body 430 is arranged at an interval from the annular portion 420.

[0148] The lamination body 430 is provided with an installation groove 432.

[0149] The installation grooves 432 of the m rotor laminations 400 penetrate axially along the rotor core 20 to form magnet slots 300.

[0150] The outer peripheral wall of the annular portion 420 and the lamination body 430 are connected by the connecting portion 440.

[0151] The number of the connecting portions 440 on the i-th rotor lamination 400 is denoted as Ai, where i ≤ m.

[0152] Wherein, p is the number of pole pairs of the motor 1.

[0153] In this embodiment, the structure of the rotor core 20 is further defined. The rotor core 20 includes m rotor laminations 400, and the rotor laminations 400 are stacked.

[0154] In at least a part of the m rotor laminations 400, the rotor lamination 400 includes an annular portion 420, a lamination body 430, and a connecting portion 440. Among them, the inner peripheral walls of the m annular portions 420 penetrate along the axial direction of the rotor core 20 to form a mounting hole 200. The lamination body 430 is provided with a mounting groove 432, and the mounting groove 432 penetrates along the axial direction of the rotor core 20 to form a magnet groove 300. The lamination body 430 and the annular portion 420 are arranged at intervals, and the outer peripheral wall of the annular portion 420 and the lamination body 430 are connected by the connecting portion 440.

[0155] For example, the number of the connecting portions 440 on the first rotor lamination 400 is denoted as A1, the number of the connecting portions 440 on the second rotor lamination 400 is denoted as A2, the number of the connecting portions 440 on the third rotor lamination 400 is denoted as A3,..., and the number of the connecting portions 440 on the i-th rotor lamination 400 is denoted as Ai. Among them, i ≤ m.

[0156] And the relationship between Ai and the pole pair number p of the motor 1 is defined to satisfy: In this way, the area of the connection region between the annular portion 420 and the lamination body 430 is ensured, the strength of the rotor core 20 can be improved, the occurrence probability of deformation of the rotor core 20 can be reduced, and the stability and reliability of the operation of the motor 1 can be ensured.

[0157] It can be understood that in at least a part of the m rotor laminations 400, the rotor lamination 400 includes an annular portion 420, a lamination body 430, and a connecting portion 440. A part of the m rotor laminations 400 includes an annular portion 420, a lamination body 430, and a connecting portion 440. Or any one of the multiple rotor laminations 400 includes an annular portion 420, a lamination body 430, and a connecting portion 440.

[0158] In some embodiments, optionally, as Figure 5 shown, the lamination body 430 includes a plurality of first magnetic pole portions 434.

[0159] The plurality of first magnetic pole portions 434 are arranged at intervals along the circumferential direction of the annular portion 420.

[0160] Any one of the plurality of first magnetic pole portions 434 includes a magnetic pole body 4342, a first limiting section 4344, and a second limiting section 4346.

[0161] The magnetic pole body 4342 of the first magnetic pole portion 434 is connected to the outer peripheral wall of the annular portion 420 through a connecting portion 440.

[0162] Along the circumferential direction of the rotor core 20, the magnetic pole body 4342 is connected between the first limiting section 4344 and the second limiting section 4346.

[0163] Either the first limiting section 4344 or the second limiting section 4346 is arranged away from the annular portion 420.

[0164] Wherein, two adjacent first magnetic pole portions 434 enclose an installation groove 432.

[0165] In this embodiment, the structure of the punching sheet body 430 is further defined such that the punching sheet body 430 includes a plurality of first magnetic pole portions 434, and the plurality of first magnetic pole portions 434 are arranged at intervals along the circumferential direction of the annular portion 420.

[0166] Any one of the plurality of first magnetic pole portions 434 includes a magnetic pole body 4342, a first limiting section 4344 and a second limiting section 4346. The magnetic pole body 4342 of the first magnetic pole portion 434 is connected to the outer peripheral wall of the annular portion 420 through a connecting portion 440. Along the circumferential direction of the rotor core 20, the magnetic pole body 4342 is connected between the first limiting section 4344 and the second limiting section 4346, and either the first limiting section 4344 or the second limiting section 4346 is arranged away from the annular portion 420. That is to say, two adjacent first magnetic pole portions 434 cooperate to limit the permanent magnet in multiple directions together, avoiding the situation of permanent magnet displacement, ensuring the running stability of the rotor core 20, and reducing the running noise of the motor 1.

[0167] It can be understood that the first limiting section 4344 and the second limiting section 4346 cooperate to limit the permanent magnet along the direction from the mounting hole 200 to the outer peripheral wall of the rotor core 20.

[0168] It can be understood that the first limiting sections 4344 and the second limiting sections 4346 of two adjacent first magnetic pole portions 434 are arranged at intervals. In this way, the magnetic field generated by the permanent magnet can form a closed loop through the rotor core 20 as fully as possible, suppressing the formation of magnetic leakage paths between the first limiting section 4344 and the second limiting section 4346, further improving magnetic leakage, and enhancing the power density of the motor 1.

[0169] In some embodiments, optionally, as Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 shown, the punching sheet body 430 includes a plurality of second magnetic pole portions 436.

[0170] The plurality of second magnetic pole portions 436 are arranged at intervals along the circumferential direction of the annular portion 420.

[0171] An installation groove 432 is arranged between two adjacent second magnetic pole portions 436.

[0172] The part of the punching sheet body 430 located between the installation groove 432 and the outer peripheral wall of the punching sheet body 430 is the outer magnetic bridge 410.

[0173] Any two adjacent second magnetic pole parts 436 are connected by an outer magnetic bridge 410.

[0174] At least a part of the plurality of second magnetic pole parts 436 is connected to the outer peripheral wall of the annular part 420 through the connecting part 440.

[0175] In this embodiment, the structure of the punching sheet body 430 is further defined such that the punching sheet body 430 includes a plurality of second magnetic pole parts 436, and the part of the punching sheet body 430 located between the installation groove 432 and the outer peripheral wall of the punching sheet body 430 is the outer magnetic bridge 410. The plurality of second magnetic pole parts 436 are arranged at intervals along the circumferential direction of the annular part 420, and any two adjacent second magnetic pole parts 436 are connected by an outer magnetic bridge 410.

[0176] It can be understood that the installation groove 432 is enclosed by two adjacent second magnetic pole parts 436 and the outer magnetic bridge 410. It can be understood that the outer magnetic bridge 410 forms the bottom of the installation groove 432, and two adjacent second magnetic pole parts 436 form the side wall and the notch of the installation groove 432. This setting can enhance the structural strength of the punching sheet body 430, and further enhance the structural strength of the rotor core 20, reduce the probability of deformation of the rotor core 20, and ensure the stability and reliability of the operation of the motor 1.

[0177] Optionally, any one of the plurality of second magnetic pole parts 436 is connected to the outer peripheral wall of the annular part 420 through a connecting part 440.

[0178] Optionally, a part of the plurality of second magnetic pole parts 436 is connected to the outer peripheral wall of the annular part 420 through the connecting part 440.

[0179] In some embodiments, optionally, as Figure 3 , Figure 5 , Figure 6 , Figure 8 , Figure 9 and Figure 10 shown, the rotor core 20 includes m rotor punching sheets 400.

[0180] The m rotor punching sheets 400 are stacked.

[0181] In at least a part of the m rotor punching sheets 400, the rotor punching sheet 400 includes an annular part 420 and a punching sheet body 430.

[0182] The inner peripheral walls of the m annular parts 420 are axially penetrated along the rotor core 20 to form an installation hole 200.

[0183] The outer peripheral wall of the annular portion 420 is provided with a positioning protrusion 450.

[0184] The punching sheet body 430 is arranged along the circumferential direction of the annular portion 420.

[0185] The punching sheet body 430 and the annular portion 420 are arranged at intervals.

[0186] The punching sheet body 430 is provided with a mounting groove 432.

[0187] The mounting grooves 432 of the m rotor punching sheets 400 penetrate axially along the rotor core 20 to form magnet grooves 300.

[0188] The positioning protrusion 450 and the mounting groove 432 are arranged opposite to each other.

[0189] The number of the positioning protrusions 450 on the i-th rotor punching sheet 400 is denoted as Bi, where i ≤ m.

[0190] Among them, p is the number of pole pairs of the motor 1.

[0191] In this embodiment, the structure of the rotor core 20 is further defined such that the rotor core 20 includes m rotor punching sheets 400, and the m rotor punching sheets 400 are stacked.

[0192] In at least a part of the m rotor punching sheets 400, the rotor punching sheet 400 includes an annular portion 420 and a punching sheet body 430. The punching sheet body 430 is arranged along the circumferential direction of the annular portion 420, and the punching sheet body 430 and the annular portion 420 are arranged at intervals. The inner peripheral walls of the m annular portions 420 penetrate axially along the rotor core 20 to form mounting holes 200. The punching sheet body 430 is provided with a mounting groove 432, and the mounting groove 432 penetrates axially along the rotor core 20 to form magnet grooves 300.

[0193] The positioning protrusion 450 and the mounting groove 432 are arranged opposite to each other, and the positioning protrusion 450 functions to limit the displacement of the permanent magnet in the magnet groove 300. In this way, the matching dimensions between the permanent magnet and the rotating shaft can be ensured, providing a reliable structural support for the effectiveness and feasibility of the operation of the motor 1.

[0194] For example, the number of the positioning protrusions 450 on the first rotor punching sheet 400 is denoted as B1, the number of the positioning protrusions 450 on the second rotor punching sheet 400 is denoted as B2, the number of the positioning protrusions 450 on the third rotor punching sheet 400 is denoted as B3,..., and the number of the positioning protrusions 450 on the i-th rotor punching sheet 400 is denoted as Bi. Among them, i ≤ m.

[0195] And the relationship between Bi and the number of pole pairs p of the motor 1 is defined to satisfy: In this way, the relationship between the number of positioning protrusions 450 and the number of permanent magnets located in the magnet slots 300 can be ensured, so that any one of the multiple magnet slots 300 can have at least one positioning protrusion 450 to cooperate with it. In this way, the permanent magnets can be effectively limited in position, avoiding displacement of the permanent magnets, ensuring the running stability of the rotor core 20, and reducing the running noise of the motor 1.

[0196] It can be understood that by rotating the installation angles of at least some of the m rotor punching sheets 400, any one of the multiple magnet slots 300 can have at least one positioning protrusion 450 to cooperate with it.

[0197] It can be understood that among at least some of the m rotor punching sheets 400, the rotor punching sheet 400 includes an annular portion 420 and a punching sheet body 430. Some of the m rotor punching sheets 400 include an annular portion 420 and a punching sheet body 430. Alternatively, any one of the multiple rotor punching sheets 400 includes an annular portion 420 and a punching sheet body 430.

[0198] In some embodiments, optionally, as Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 8 、 Figure 9 and Figure 10 shown, the rotor core 20 includes m rotor punching sheets 400.

[0199] The m rotor punching sheets 400 are stacked.

[0200] At least some of the m rotor punching sheets 400 include an annular portion 420. The inner peripheral wall of the annular portion 420 forms part of the hole wall of the mounting hole 200.

[0201] The magnet slots 300 are located on one side of the inner peripheral wall of the annular portion 420.

[0202] The number of the annular portions 420 is denoted as C, where C≥0.25×m.

[0203] In this embodiment, the structure of the rotor core 20 is further defined such that the rotor core 20 includes m rotor punching sheets 400, and the m rotor punching sheets 400 are stacked.

[0204] At least some of the m rotor punching sheets 400 include an annular portion 420. The inner peripheral wall of the annular portion 420 forms part of the hole wall of the mounting hole 200, and the magnet slots 300 are located on one side of the inner peripheral wall of the annular portion 420. This setting can ensure the fitting area between the rotor core 20 and the rotating shaft of the motor 1, providing structural support for ensuring the effective operation of the motor 1.

[0205] It can be understood that the magnet slots 300 are arranged at intervals from the inner peripheral wall of the annular portion 420.

[0206] It can be understood that at least a part of the m rotor laminations 400 includes the annular portion 420. A part of the m rotor laminations 400 includes the annular portion 420. Alternatively, any one of the multiple rotor laminations 400 includes the annular portion 420.

[0207] A chassis system according to some other embodiments of the present application includes: the motor 1 in any of the above embodiments.

[0208] A chassis system provided by the present application includes the motor 1.

[0209] The motor 1 includes a stator core 10 and a rotor core 20.

[0210] The rotor core 20 is rotatably connected to the stator core 10, that is, the rotor core 20 can rotate relative to the stator core 10.

[0211] The rotor core 20 is provided with mounting holes 200 and a plurality of magnet slots 300. The plurality of magnet slots 300 are arranged at intervals around the mounting holes 200. The magnet slots 300 are used to mount and fix permanent magnets. It can be understood that along the axial direction of the rotor core 20, the mounting holes 200 penetrate through the rotor core 20, and the magnet slots 300 penetrate through the rotor core 20.

[0212] The present application reasonably sets the matching structure of the stator core 10 and the rotor core 20. Specifically, along the axial direction of the stator core 10, the height of the stator core 10 is denoted as H1, and the height of the rotor core 20 is denoted as H2. That is, the axial height of the stator core 10 is H1, and the axial height of the rotor core 20 is H2. Along the circumferential direction of the rotor core 20, the width of the magnet slot 300 is Lm. Along the direction from the mounting hole 200 to the outer peripheral wall of the rotor core 20, the depth of the magnet slot 300 is Wm, and the distance from the center of the mounting hole 200 to the outer peripheral wall of the rotor core 20 is R1. And the relationship of H1, H2, Wm, Lm, and R1 is defined to satisfy: |H1 - H2|×(Wm + Lm) < π×R1×(H1 + H2). That is, the axial heights of the stator core 10 and the rotor core 20 are different. It can also be said that after the stator core 10 and the rotor core 20 are assembled, in the axial direction of the stator core 10, there is a height difference between the stator core 10 and the rotor core 20. In this way, the problem of end leakage magnetic flux of the motor 1 can be improved, the torque is increased, the torque ripple is suppressed, which is beneficial to reducing the vibration and noise of the motor 1, and the use performance and market competitiveness of the product are improved.

[0213] It can be understood that along the axial direction of the stator core 10, the rotor core 20 has a first end face and a second end face, and the stator core 10 has a third end face and a fourth end face. The third end face is located at the first end face, and the fourth end face is located at the second end face. There is a height difference between the first end face and the third end face, and / or there is a height difference between the second end face and the fourth end face.

[0214] A vehicle according to some further embodiments of the present application includes: the motor 1 in any of the above embodiments, or the chassis system as described in the above embodiments.

[0215] A vehicle provided by the present application includes the motor 1 or the chassis system.

[0216] The motor 1 includes a stator core 10 and a rotor core 20.

[0217] The rotor core 20 is rotatably connected to the stator core 10, that is, the rotor core 20 can rotate relative to the stator core 10.

[0218] The rotor core 20 is provided with a mounting hole 200 and a plurality of magnet slots 300. The plurality of magnet slots 300 are arranged at intervals around the mounting hole 200. The magnet slots 300 are used to mount and fix permanent magnets. It can be understood that along the axial direction of the rotor core 20, the mounting hole 200 penetrates the rotor core 20, and the magnet slots 300 penetrate the rotor core 20.

[0219] The present application reasonably sets the matching structure of the stator core 10 and the rotor core 20. Specifically, along the axial direction of the stator core 10, the height of the stator core 10 is denoted as H1, and the height of the rotor core 20 is denoted as H2. That is, the axial height of the stator core 10 is H1, and the axial height of the rotor core 20 is H2. Along the circumferential direction of the rotor core 20, the width of the magnet slot 300 is Lm. Along the direction from the mounting hole 200 to the outer peripheral wall of the rotor core 20, the depth of the magnet slot 300 is Wm, and the distance from the center of the mounting hole 200 to the outer peripheral wall of the rotor core 20 is R1. And the relationship between H1, H2, Wm, Lm and R1 is defined to satisfy: |H1 - H2|×(Wm + Lm) < π×R1×(H1 + H2). That is, the axial heights of the stator core 10 and the rotor core 20 are different. It can also be said that after the stator core 10 and the rotor core 20 are assembled, in the axial direction of the stator core 10, there is a height difference between the stator core 10 and the rotor core 20. In this way, the problem of end leakage magnetic flux of the motor 1 can be improved, the torque is increased, the torque ripple is suppressed, which is beneficial to reducing the vibration and noise of the motor 1, and the use performance and market competitiveness of the product are improved.

[0220] It can be understood that along the axial direction of the stator core 10, the rotor core 20 has a first end face and a second end face, and the stator core 10 has a third end face and a fourth end face. The third end face is located at the first end face, and the fourth end face is located at the second end face. There is a height difference between the first end face and the third end face, and / or there is a height difference between the second end face and the fourth end face.

[0221] It is worth noting that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0222] Optionally, the chassis system includes a powertrain system, a running gear system, a steering system (such as an electric power steering system), and a braking system. The chassis system is used to support and install the 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.

[0223] Optionally, by reasonably setting the matching structure of the stator core 10 and the rotor core 20 in the present application, the problem of performance degradation caused by end leakage flux of the motor 1 (such as the permanent magnet motor 1) can be effectively solved, the cogging torque is reduced, the torque is increased, the torque ripple is suppressed, and the vibration and noise of the motor 1 are improved.

[0224] The motor 1 includes a stator core 10 and a rotor core 20. The stator core 10 includes stator teeth 120 and a stator yoke 130. The rotor core 20 includes a plurality of first magnetic pole portions 434 or a plurality of second magnetic pole portions 436. A magnet slot 300 is provided between two adjacent first magnetic pole portions 434, or a magnet slot 300 is provided between two adjacent second magnetic pole portions 436. The magnet slot 300 is used to accommodate a permanent magnet.

[0225] There is an air gap between the stator core 10 and the rotor core 20.

[0226] The axial height of the stator core 10 is H1, the axial height of the rotor core 20 is H2, the circumferential width of the magnet slot 300 is denoted as Lm, the depth of the magnet slot 300 in the direction from the mounting hole 200 to the outer peripheral wall of the rotor core 20 is denoted as Wm, and the distance from the mounting hole 200 to the outer peripheral wall of the rotor core 20 is denoted as R1, where 0 < (|H1 - H2| × (Wm + Lm)) / (π × R1 × (H1 + H2)) ≤ 0.1.

[0227] H1, H2, Wm, Lm, and R1 satisfy: 0 < (|H1 - H2| × (Wm + Lm)) / (π × R1 × (H1 + H2)) ≤ 0.05.

[0228] There is an air gap between the stator core 10 and the rotor core 20, and the minimum value of the air gap is lg, where 0 < (2×π×lg) / (H1 + H2) ≤ 0.5.

[0229] The central axis of the stator core 10 overlaps with the center of the mounting hole 200 of the rotor core 20.

[0230] The rotor core 20 includes m rotor punching sheets 400, and the m rotor punching sheets 400 are axially laminated. The number of the outer magnetic bridges 410 on the first rotor punching sheet 400 is denoted as N1, the number of the outer magnetic bridges 410 on the second rotor punching sheet 400 is denoted as N2,..., and the number of the outer magnetic bridges 410 on the i-th rotor punching sheet 400 is denoted as Ni, i ≤ m. Among them, p is the number of pole pairs of the motor 1.

[0231] The rotor core 20 includes m rotor punching sheets 400, and the m rotor punching sheets 400 are axially laminated. The number of the connecting parts 440 on the first rotor punching sheet 400 is denoted as A1, the number of the connecting parts 440 on the second rotor punching sheet 400 is denoted as A2,..., and the number of the connecting parts 440 on the i-th rotor punching sheet 400 is denoted as Ai, i ≤ m, where p is the number of pole pairs of the motor 1.

[0232] The rotor core 20 includes m rotor punching sheets 400, and the m rotor punching sheets 400 are axially laminated. The number of the positioning protrusions 450 on the first rotor punching sheet 400 is denoted as B1, the number of the positioning protrusions 450 on the second rotor punching sheet 400 is denoted as B2,..., and the number of the positioning protrusions 450 on the i-th rotor punching sheet 400 is denoted as Bi, i ≤ m. Among them, p is the number of pole pairs of the motor 1.

[0233] Among them, p is the number of pole pairs of the motor 1. At least a part of the m rotor punching sheets 400 includes an annular part 420, and the number of the annular parts 420 is denoted as C, where C ≥ 0.25×m.

[0234] The positioning protrusion 450 includes at least one of a strip segment and an arc segment.

[0235] The connecting part 440 includes at least one of a strip segment and an arc segment.

[0236] Any one of the plurality of magnet slots 300 has at least one positioning protrusion 450 corresponding to it.

[0237] The plurality of rotor punching sheets 400 are assembled together by rivets, welding and gluing.

[0238] Among them, (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) = X. Figure 11and Figure 12 shows the trends of the cogging torque, output torque, and torque ripple of the motor 1 changing with the change of X.

[0239] Taking the permanent magnet motor 1 with 12 slots and 10 poles as an example, the number of pole pairs p of the motor 1 is 5. Figure 11 and Figure 12 shows the simulation results of the cogging torque, output torque, and torque ripple under different X values. Among them, Cost*, Te*, and Tr* are per-unit values. Cost* is the ratio of the cost under different X values to the cost when X = 0. Te* is the ratio of the output torque under different X values to the output torque when X = 0. Tr* is the ratio of the torque ripple under different X values to the torque ripple when X = 0. When 0 < X < 0.05, the cost performance of the motor 1 is better.

[0240] The stator core 10 and the rotor core 20.

[0241] The rotor core 20 is rotatably connected to the stator core 10, that is, the rotor core 20 can rotate relative to the stator core 10.

[0242] The rotor core 20 is provided with an installation hole 200 and a plurality of magnet slots 300. The plurality of magnet slots 300 are arranged at intervals around the installation hole 200. The magnet slots 300 are used to install and fix the permanent magnets. It can be understood that along the axial direction of the rotor core 20, the installation hole 200 penetrates through the rotor core 20, and the magnet slots 300 penetrate through the rotor core 20.

[0243] This application reasonably sets the matching structure of the stator core 10 and the rotor core 20. Specifically, along the axial direction of the stator core 10, the height of the stator core 10 is denoted as H1, and the height of the rotor core 20 is denoted as H2. That is, the axial height of the stator core 10 is H1, and the axial height of the rotor core 20 is H2. Along the circumferential direction of the rotor core 20, the width of the magnet slot 300 is Lm. Along the direction from the installation hole 200 to the outer peripheral wall of the rotor core 20, the depth of the magnet slot 300 is Wm, and the distance from the center of the installation hole 200 to the outer peripheral wall of the rotor core 20 is R1. And the relationship between H1, H2, Wm, Lm, and R1 is defined to satisfy: |H1 - H2|×(Wm + Lm) < π×R1×(H1 + H2). That is, the axial heights of the stator core 10 and the rotor core 20 are different. It can also be said that after the stator core 10 and the rotor core 20 are assembled, in the axial direction of the stator core 10, there is a height difference between the stator core 10 and the rotor core 20. In this way, the problem of end leakage magnetic flux of the motor 1 can be improved, the torque is increased, the torque ripple is suppressed, which is beneficial to reducing the vibration and noise of the motor 1, and improving the use performance and market competitiveness of the product.

[0244] It can be understood that along the axial direction of the stator core 10, the rotor core 20 has a first end face and a second end face, and the stator core 10 has a third end face and a fourth end face. The third end face is located at the first end face, and the fourth end face is located at the second end face. There is a height difference between the first end face and the third end face, and / or there is a height difference between the second end face and the fourth end face.

[0245] In this application, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "mounted", "connected", "connected to", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0246] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. 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 motor, characterized in that, Comprising: A stator core; A rotor core, the rotor core being rotatably connected to the stator core, the rotor core being provided with a mounting hole and a plurality of magnet slots, the plurality of magnet slots being arranged at intervals around the mounting hole; Along the axial direction of the stator core, the height of the stator core is denoted as H1, and the height of the rotor core is denoted as H2; The width of the magnet slot in the circumferential direction of the rotor core is denoted as Lm, the depth of the magnet slot in the direction from the mounting hole to the outer peripheral wall of the rotor core is denoted as Wm, and the distance from the center of the mounting hole to the outer peripheral wall of the rotor core is denoted as R1; Wherein, |H1 - H2|×(Wm + Lm) < π×R1×(H1 + H2).

2. The motor according to claim 1, characterized in that, H1, H2, Wm, Lm and R1 satisfy: 0 < (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) ≤ 0.

1.

3. The motor according to claim 2, characterized in that, H1, H2, Wm, Lm and R1 satisfy: 0 < (|H1 - H2|×(Wm + Lm)) / (π×R1×(H1 + H2)) ≤ 0.

05.

4. The electric machine according to any one of claims 1 to 3, characterized in that Along the direction from the mounting hole to the outer peripheral wall of the rotor core, the minimum value of the air gap between the stator core and the rotor core is denoted as lg, wherein, 0 < (2×π×lg) / (H1 + H2) ≤ 0.

5.

5. The electric machine according to any one of claims 1 to 3, characterized in that The central axis of the stator core coincides with the center of the mounting hole.

6. The electric machine according to any one of claims 1 to 3, characterized in that, The rotor core includes: m rotor punching sheets, the m rotor punching sheets being stacked, and any one of the mounting hole and the magnet slots penetrates through the m rotor punching sheets; In at least a part of the m rotor punching sheets, the part of the rotor punching sheet between the magnet slot and the outer peripheral wall of the rotor punching sheet is an outer magnetic bridge; The number of the outer magnetic bridges on the i-th rotor punching sheet is denoted as Ni, i ≤ m; Among them, p is the number of pole pairs of the motor.

7. The electric machine according to any one of claims 1 to 3, characterized in that, The rotor core includes: m rotor punching sheets, the m rotor punching sheets being stacked; In at least a part of the m rotor punching sheets, the rotor punching sheet includes: An annular portion, the inner peripheral walls of the m annular portions penetrate along the axial direction of the rotor core to form the mounting hole; A punching sheet body, the punching sheet body being arranged along the circumferential direction of the annular portion, the punching sheet body being spaced apart from the annular portion, the punching sheet body being provided with a mounting groove, and the mounting grooves of the m rotor punching sheets penetrate along the axial direction of the rotor core to form the magnet slots; A connecting portion, the outer peripheral wall of the annular portion and the punching sheet body are connected by the connecting portion; The number of the connecting portions on the i-th rotor punching sheet is denoted as Ai, i ≤ m; Among them, p is the number of pole pairs of the motor.

8. The motor according to claim 7, characterized in that, The punching sheet body includes: A plurality of first magnetic pole portions, the plurality of first magnetic pole portions being arranged at intervals along the circumferential direction of the annular portion, any one of the plurality of first magnetic pole portions includes a magnetic pole body, a first limiting section and a second limiting section, the magnetic pole body of the first magnetic pole portion is connected to the outer peripheral wall of the annular portion through one of the connecting portions, along the circumferential direction of the rotor core, the magnetic pole body is connected between the first limiting section and the second limiting section, and any one of the first limiting section and the second limiting section is arranged away from the annular portion; Wherein, the installation groove is defined by two adjacent ones of the first magnetic pole portions.

9. The motor according to claim 7, characterized in that, The punching sheet body includes: a plurality of second magnetic pole portions which are arranged at intervals along the circumferential direction of the annular portion; one installation groove is arranged between two adjacent ones of the second magnetic pole portions; a portion of the punching sheet body between the installation groove and the outer peripheral wall of the punching sheet body is an outer magnetic bridge, and any two adjacent ones of the second magnetic pole portions are connected by one outer magnetic bridge; at least a part of the plurality of second magnetic pole portions is connected to the outer peripheral wall of the annular portion through the connecting portion.

10. The electric machine according to any one of claims 1 to 3, characterized in that, The rotor core includes: m rotor punching sheets which are stacked; in at least a part of the m rotor punching sheets, the rotor punching sheet includes: an annular portion, the inner peripheral walls of the m annular portions penetrate along the axial direction of the rotor core to form the installation hole, and the outer peripheral wall of the annular portion is provided with positioning protrusions; a punching sheet body which is arranged along the circumferential direction of the annular portion, the punching sheet body is arranged at an interval from the annular portion, the punching sheet body is provided with an installation groove, and the installation grooves of the m rotor punching sheets penetrate along the axial direction of the rotor core to form the magnet groove, and the positioning protrusions are arranged opposite to the installation grooves; the number of the positioning protrusions on the i-th rotor punching sheet is denoted as Bi, where i ≤ m; Among them, p is the number of pole pairs of the motor.

11. The electric machine according to any one of claims 1 to 3, characterized in that, The rotor core includes: m rotor punching sheets which are stacked, and at least a part of the m rotor punching sheets includes an annular portion, the inner peripheral wall of the annular portion forms a part of the hole wall of the installation hole, and the magnet groove is located on one side of the inner peripheral wall of the annular portion; the number of the annular portions is denoted as C, wherein C ≥ 0.25 × m.

12. A chassis system, characterized in that, Including: The motor according to any one of claims 1 to 11.

13. A vehicle, characterized in that, Including: The motor according to any one of claims 1 to 11; Or The chassis system according to claim 12.

Images