Rotor, motor, electric power steering system and vehicle

Abstract

The invention provides a rotor, a motor, an electric power steering system and a vehicle. Wherein the rotor comprises a plurality of iron core groups, and each iron core group comprises an iron core and a plurality of permanent magnets. The iron core comprises an iron core body, a mounting hole and a plurality of magnetic steel grooves. The iron core body comprises a plurality of magnetic flux groups, each magnetic flux group comprises a magnetic flux shielding structure and a magnetic flux part, and each magnetic flux shielding structure comprises a main body part and two connecting end parts; the two permanent magnets which are oppositely arranged in any two adjacent iron core groups are arranged in a staggered manner in the circumferential direction of the rotor; in the iron core group, one of two adjacent permanent magnets is arranged opposite to one connecting end part of the magnetic flux shielding structure, and the other one of the two adjacent permanent magnets is arranged opposite to the other connecting end part of the magnetic flux shielding structure; the part, opposite to the permanent magnet, of the connecting end part comprises a first end part section and a second end part section; the distance from the outer peripheral wall of the first end section to the permanent magnet is smaller than the distance from the outer peripheral wall of the second end section to the permanent magnet.

Description

Technical Field

[0001] The present application relates to the field of motors, and more particularly, to a rotor, a motor, an electric power steering system, and a vehicle. Background Art

[0002] In the related art, a permanent magnet synchronous motor adopts a segmented skewed pole structure design. However, there is a certain degree of axial magnetic leakage in the permanent magnet synchronous motor with such a segmented skewed pole structure, which in turn leads to a decrease in the output torque. Summary of the Invention

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

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

[0005] A second aspect of the present application proposes a motor.

[0006] A third aspect of the present application proposes an electric power steering system.

[0007] A fourth aspect of the present application proposes a vehicle.

[0008] In view of this, a first aspect of the present application proposes a rotor, including: a plurality of iron core groups stacked on top of each other. Each iron core group includes an iron core and a plurality of permanent magnets. Each iron core includes: an iron core body; a mounting hole provided in the iron core body. The mounting holes of the plurality of iron core groups penetrate along the axial direction of the rotor to form an axial hole; a plurality of magnet slots provided in the iron core body. The plurality of magnet slots are arranged at intervals around the axial hole. One permanent magnet is provided in each magnet slot; the part of the iron core body between the magnet slot and the outer peripheral wall of the iron core body includes a plurality of magnetic flux groups arranged around the axial hole. Each magnetic flux group includes a magnetic flux shielding structure and a magnetic flux portion in the circumferential direction of the rotor. The magnetic flux shielding structure is connected to the circumferential side of the magnetic flux portion. Each magnetic flux portion is disposed opposite to one permanent magnet. Each magnetic flux shielding structure includes a main body portion and two connecting end portions. Along the circumferential direction of the rotor, the main body portion is connected between the two connecting end portions; the two permanent magnets disposed opposite to each other in any two adjacent iron core groups are staggered in the circumferential direction of the rotor; in the iron core group, one of the two adjacent permanent magnets is disposed opposite to one connecting end portion of the magnetic flux shielding structure, and the other of the two adjacent permanent magnets is disposed opposite to the other connecting end portion of the magnetic flux shielding structure; along the circumferential direction of the rotor, the part of the connecting end portion disposed opposite to the permanent magnet includes a first end segment and a second end segment; wherein, the distance from the outer peripheral wall of the first end segment to the permanent magnet is less than the distance from the outer peripheral wall of the second end segment to the permanent magnet.

[0009] In the core group, two adjacent permanent magnets are respectively recorded as the first permanent magnet and the second permanent magnet, and the two connecting ends of the magnetic flux shielding structure are respectively recorded as the first connecting end and the second connecting end, the first connecting end and the first permanent magnet are arranged oppositely, and the second connecting end and the second permanent magnet are arranged oppositely. In other words, the two connecting ends of the magnetic flux shielding structure are respectively arranged correspondingly to the two adjacent permanent magnets.

[0010] The structure of the connecting end is further defined, so that the portion of the connecting end opposite to the permanent magnet includes a first end section and a second end section, and the first end section and the second end section are arranged along the circumference of the rotor. The distance from the outer peripheral wall of the first end section to the permanent magnet is smaller than the distance from the outer peripheral wall of the second end section to the permanent magnet. That is, the wall surface enclosed by the outer peripheral wall of the first end section and the outer peripheral wall of the second end section is not parallel to the wall surface of the permanent magnet facing away from the shaft hole (that is, the radial outer wall surface of the permanent magnet).

[0011] That is to say, by limiting the structure of the outer peripheral wall of the core body to adjust the gap between the rotor and the stator of the motor and to adjust the direction of the magnetic lines of force, it is possible to effectively reduce leakage flux, suppress the decrease in the magnetic flux of the rotor, and suppress the decrease in the torque of the motor, which is beneficial to improving the output torque of the motor.

[0012] Optionally, the portion of the core body located between the magnetic steel slot and the outer peripheral wall of the core body includes a plurality of magnetic flux shielding structures and a plurality of magnetic flux portions. Along the circumference of the rotor, the plurality of magnetic flux shielding structures and the plurality of magnetic flux portions are arranged alternately, that is, a magnetic flux portion is provided between any two adjacent magnetic flux shielding structures.

[0013] It can be understood that the two permanent magnets arranged opposite to each other in any two adjacent core groups are staggered in the circumferential direction of the rotor. The two permanent magnets arranged opposite to each other in any two adjacent core groups are respectively recorded as the first permanent magnet and the second permanent magnet. A part of the first permanent magnet is arranged opposite to the second permanent magnet, and along the circumferential direction of the rotor, another part of the first permanent magnet extends out of the outer edge of the second permanent magnet. In other words, the center lines of the two corresponding permanent magnets in any two adjacent core groups are not overlapped, but staggered at a certain angle, so that the two corresponding permanent magnets in any two adjacent core groups do not completely overlap, but partially overlap and partially misaligned. In this way, the rotor has a segmented skew pole structure, which can effectively reduce the cogging torque and torque pulsation of the motor.

[0014] According to the above-mentioned rotor of the present application, the following additional technical features may also be provided:

[0015] In some embodiments, optionally, along the circumferential direction of the rotor, the portion of the connecting end portion opposite to the permanent magnet further includes a third end portion segment, and the first end portion segment is connected between the second end portion segment and the third end portion segment; wherein, the distance from the outer peripheral wall of the first end portion segment to the permanent magnet is less than the distance from the outer peripheral wall of the third end portion segment to the permanent magnet.

[0016] In this embodiment, the structure of the iron core body is further defined such that, along the circumferential direction of the rotor, the portion of the connecting end portion opposite to the permanent magnet further includes a third end portion segment, and the first end portion segment is connected between the second end portion segment and the third end portion segment. That is to say, the wall surface enclosed by the outer peripheral walls of the first end portion segment, the second end portion segment, and the third end portion segment is not parallel to the wall surface of the permanent magnet facing away from the shaft hole (i.e., the radially outer wall surface of the permanent magnet).

[0017] Wherein, the distance from the outer peripheral wall of the first end portion segment to the permanent magnet is less than the distance from the outer peripheral wall of the second end portion segment to the permanent magnet, and the distance from the outer peripheral wall of the first end portion segment to the permanent magnet is less than the distance from the outer peripheral wall of the third end portion segment to the permanent magnet. That is to say, the portion of the connecting end portion opposite to the permanent magnet has a structure that is thinner in the middle and thicker at both ends. This setting defines the structure of the outer peripheral wall of the iron core body to adjust the gap between the rotor and the stator of the motor, to adjust the direction of the magnetic flux lines, which can effectively reduce magnetic leakage, suppress the decrease of the magnetic flux portion of the rotor, and can suppress the decrease of the torque of the motor, which is beneficial to improving the output torque of the motor and solving problems such as the decrease of the output torque caused by segmented skewed poles.

[0018] Optionally, the distance from the outer peripheral wall of the second end portion segment to the permanent magnet is equal to the distance from the outer peripheral wall of the third end portion segment to the permanent magnet.

[0019] Optionally, the distance from the outer peripheral wall of the second end portion segment to the permanent magnet is greater than the distance from the outer peripheral wall of the third end portion segment to the permanent magnet.

[0020] Optionally, the distance from the outer peripheral wall of the second end portion segment to the permanent magnet is less than the distance from the outer peripheral wall of the third end portion segment to the permanent magnet.

[0021] In some embodiments, optionally, the connection between the outer peripheral walls of the first end portion segment and the second end portion segment has a smooth transition; and / or the connection between the outer peripheral walls of the first end portion segment and the third end portion segment has a smooth transition.

[0022] In this embodiment, the structure of the iron core body is further defined such that the connection between the outer peripheral walls of the first end portion segment and the second end portion segment has a smooth transition, and / or the connection between the outer peripheral walls of the first end portion segment and the third end portion segment has a smooth transition.

[0023] That is to say, the wall surface enclosed by the outer peripheral wall of the first end section and the outer peripheral wall of the second end section has a smooth transition. In this way, the problem of stress concentration will not occur, and the effective cooperation between the stator and the rotor during the operation of the motor can be ensured.

[0024] And / or the wall surface enclosed by the outer peripheral wall of the first end section and the outer peripheral wall of the third end section has a smooth transition. In this way, the problem of stress concentration will not occur, and the effective cooperation between the stator and the rotor during the operation of the motor can be ensured.

[0025] In some embodiments, optionally, the distance from the outer peripheral wall of the magnetic flux portion to the permanent magnet is greater than the distance from the outer peripheral wall of the connecting end portion to the permanent magnet.

[0026] In this embodiment, the structure of the iron core body is further defined such that the distance from the outer peripheral wall of the magnetic flux portion to the permanent magnet is greater than the distance from the outer peripheral wall of the connecting end portion to the permanent magnet. The magnetic flux portion and the magnetic flux shielding structure cooperate to define the structure of the outer peripheral wall of the iron core body. In this way, the gap between the rotor and the stator of the motor can be adjusted to adjust the direction of the magnetic field lines, effectively reducing magnetic leakage, suppressing the decrease of the magnetic flux portion of the rotor, and suppressing the decrease of the torque of the motor, which is beneficial to improving the output torque of the motor.

[0027] In some embodiments, optionally, the outer peripheral wall of the magnetic flux portion is a first arc-shaped wall protruding away from the shaft hole, the outer peripheral wall of the main body portion is a second arc-shaped wall protruding away from the shaft hole, and the outer peripheral wall of the connecting end portion is a third arc-shaped wall recessed towards the shaft hole; the center of the circle corresponding to the first arc-shaped wall is located on one side of the center of the shaft hole, and the center of the circle corresponding to the second arc-shaped wall coincides with the center of the shaft hole.

[0028] In this embodiment, the cooperation structure between the magnetic flux portion and the magnetic flux shielding structure is further defined. The outer peripheral wall of the magnetic flux portion is a first arc-shaped wall protruding away from the shaft hole. The outer peripheral wall of the main body portion is a second arc-shaped wall protruding away from the shaft hole. The outer peripheral wall of the connecting end portion is a third arc-shaped wall recessed towards the shaft hole.

[0029] Among them, the center of the circle corresponding to the first arc-shaped wall is located on one side of the center of the shaft hole, and the center of the circle corresponding to the second arc-shaped wall coincides with the center of the shaft hole. That is to say, the center of the circle corresponding to the first arc-shaped wall is set away from the center of the shaft hole.

[0030] In this way, the structure of the outer peripheral wall of the iron core body is defined. The purpose of adjusting the gap between the stator and the rotor can be achieved.

[0031] In some embodiments, optionally, the magnetic flux portions are symmetrically arranged along the center line of the corresponding magnetic poles; the magnetic flux shielding structures are symmetrically arranged along the center line between the poles.

[0032] In this embodiment, the magnetic flux portion is symmetrically arranged along the center line of the magnetic pole where it is located. That is, the center line of the magnetic flux portion coincides with the center line of the magnetic pole where it is located. The center line of the magnetic pole is simply referred to as the d-axis.

[0033] The magnetic flux shielding structure is symmetrically arranged along the center line between the poles. That is, the center line of the magnetic flux shielding structure coincides with the center line between the poles. The center line between the poles is simply referred to as the q-axis.

[0034] That is to say, the magnetic path where the magnetic flux portion is located is the d-axis magnetic path. The magnetic path where the magnetic flux shielding structure is located is the q-axis magnetic path. The structural setting of the magnetic flux portion can effectively reduce the main torque ripple order and radial electromagnetic force density of the motor under high torque conditions. The structural setting of the magnetic flux shielding structure can effectively reduce the main torque ripple order and radial electromagnetic force density of the motor under low torque conditions. And it has little influence on the magnitude of the output torque of the motor.

[0035] This setting causes the d-axis and q-axis inductances of the motor to decrease simultaneously. It not only does not affect the saliency ratio of the motor (the saliency ratio directly affects the torque output of the motor under high-speed performance), but also increases the peak power of the motor, reduces the armature reaction of the motor, and has little influence on the peak torque performance of the motor.

[0036] In some embodiments, optionally, the two connecting ends of each magnetic flux shielding structure are symmetrically arranged along the center line between the poles.

[0037] In this embodiment, the structure of the magnetic flux shielding structure is further defined.

[0038] Among them, the magnetic flux shielding structure includes a main body portion and two connecting ends. Along the circumferential direction of the rotor, the main body portion is connected between the two connecting ends, and the two connecting ends are symmetrically arranged along the center line between the poles. This setting can stabilize the performance of the motor during forward and reverse rotations and meet the diverse usage requirements of users.

[0039] At the same time, this structural setting has the effect of facilitating installation and improving assembly efficiency, and can ensure the yield rate of the product. If the shapes of the two connecting ends are different and the operator misassembles them, it will affect the performance of the motor.

[0040] And this structural setting makes the magnetic field lines distribute more uniformly, and the air-gap magnetic field distributes more uniformly and symmetrically. 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.

[0041] In addition, this structural setting can simplify the processing difficulty and is beneficial to improving the processing efficiency of the product.

[0042] In some embodiments, optionally, the number of iron core groups is greater than or equal to three; among three adjacent iron core groups, three relatively arranged magnetic flux groups are respectively denoted as a first magnetic flux group, a second magnetic flux group, and a third magnetic flux group, and the second magnetic flux group is located between the first magnetic flux group and the third magnetic flux group; a part of the magnetic flux shielding structure of the second magnetic flux group overlaps with the magnetic flux shielding structure of the first magnetic flux group, and a part of the magnetic flux portion of the second magnetic flux group overlaps with the magnetic flux shielding structure of the first magnetic flux group; a part of the magnetic flux shielding structure of the third magnetic flux group overlaps with the magnetic flux shielding structure of the second magnetic flux group, and a part of the magnetic flux portion of the third magnetic flux group overlaps with the magnetic flux shielding structure of the second magnetic flux group.

[0043] In this embodiment, the structure of the rotor is further defined.

[0044] The number of iron core groups is greater than or equal to three. Among three adjacent iron core groups, three relatively arranged magnetic flux groups are respectively denoted as a first magnetic flux group, a second magnetic flux group, and a third magnetic flux group. For example, among three adjacent iron core groups respectively denoted as a first iron core group, a second iron core group, and a third iron core group, the second iron core group is located between the first iron core group and the third iron core group. The three relatively arranged magnetic flux groups of the first iron core group, the second iron core group, and the third iron core group are respectively denoted as a first magnetic flux group, a second magnetic flux group, and a third magnetic flux group. The first iron core group includes the first magnetic flux group, the second iron core group includes the second magnetic flux group, and the third iron core group includes the third magnetic flux group.

[0045] Among them, a part of the magnetic flux shielding structure of the second magnetic flux group overlaps with the magnetic flux shielding structure of the first magnetic flux group, and a part of the magnetic flux portion of the second magnetic flux group overlaps with the magnetic flux shielding structure of the first magnetic flux group; a part of the magnetic flux shielding structure of the third magnetic flux group overlaps with the magnetic flux shielding structure of the second magnetic flux group, and a part of the magnetic flux portion of the third magnetic flux group overlaps with the magnetic flux shielding structure of the second magnetic flux group.

[0046] That is to say, along the axial direction of the rotor, in the projection of the first magnetic flux group on the second iron core group, a part of the magnetic flux shielding structure of the second magnetic flux group overlaps with the magnetic flux shielding structure of the first magnetic flux group, and a part of the magnetic flux portion of the second magnetic flux group overlaps with the magnetic flux shielding structure of the first magnetic flux group.

[0047] Along the axial direction of the rotor, in the projection of the third magnetic flux group on the second iron core group, a part of the magnetic flux shielding structure of the third magnetic flux group overlaps with the magnetic flux shielding structure of the second magnetic flux group, and a part of the magnetic flux portion of the third magnetic flux group overlaps with the magnetic flux shielding structure of the second magnetic flux group.

[0048] This setting can effectively reduce the torque ripple of the motor, effectively improve the effective utilization rate of the magnetic flux, reduce the leakage magnetic flux, and improve problems such as the output torque drop caused by the segmented skewed poles.

[0049] In some embodiments, optionally, the permanent magnet is a bar-shaped permanent magnet.

[0050] In this embodiment, the shape of the permanent magnet is defined. Specifically, the permanent magnet is a bar-shaped permanent magnet.

[0051] In some embodiments, optionally, the permanent magnet includes a plurality of first permanent magnet segments, and the plurality of first permanent magnet segments are arranged in a bar shape.

[0052] In this embodiment, the structure of the permanent magnet is further defined such that the permanent magnet includes a plurality of first permanent magnet segments, and the plurality of first permanent magnet segments are arranged in a bar shape. This setting enables the first permanent magnet segments made of the same material or different materials to be set according to specific actual usage requirements. In this way, the production cost and service performance of the rotor can be taken into account.

[0053] For example, a part of the first permanent magnet segments are made of a material with a higher cost, and another part of the first permanent magnet segments are made of a material with a lower cost. To reduce the production cost of the rotor while ensuring the service performance of the rotor.

[0054] In some embodiments, optionally, the permanent magnet includes two second permanent magnet segments, and each second permanent magnet segment includes a first permanent magnet end and a second permanent magnet end. The first permanent magnet end is located between the shaft hole and the second permanent magnet end. The first permanent magnet ends of the two second permanent magnet segments are adjacent to each other, and the second permanent magnet ends of the two second permanent magnet segments are away from each other.

[0055] In this embodiment, the structure of the permanent magnet is further defined such that the permanent magnet includes two second permanent magnet segments, and each second permanent magnet segment includes a first permanent magnet end and a second permanent magnet end.

[0056] Among them, the first permanent magnet end is located between the shaft hole and the second permanent magnet end. The first permanent magnet ends of the two second permanent magnet segments are adjacent to each other, and the second permanent magnet ends of the two second permanent magnet segments are away from each other.

[0057] That is to say, the two second permanent magnet segments are arranged in a "V" shape, and the opening of the "V" shape faces the outer edge of the iron core body.

[0058] In some embodiments, optionally, the second permanent magnet segment includes a plurality of sub-segments, and the plurality of sub-segments are arranged in a bar shape.

[0059] In this embodiment, the structure of the second permanent magnet segment is further defined such that the second permanent magnet segment includes a plurality of sub-segments, and the plurality of sub-segments are arranged in a bar shape. This setting enables the sub-segments made of the same material or different materials to be set according to specific actual usage requirements. In this way, the production cost and service performance of the rotor can be taken into account.

[0060] For example, a part of the sub-segments are made of a material with a higher cost, and another part of the sub-segments are made of a material with a lower cost. To reduce the production cost of the rotor while ensuring the service performance of the rotor.

[0061] In some embodiments, optionally, in the iron core group, the polarities of the end faces of two adjacent permanent magnets facing away from the shaft hole are different.

[0062] In this embodiment, the structure of the iron core group is defined such that, in the iron core group, the polarities of the end faces of two adjacent permanent magnets facing away from the shaft hole are different. For example, the plurality of permanent magnets include a plurality of first permanent magnets and a plurality of second permanent magnets, and the plurality of first permanent magnets and the plurality of second permanent magnets are arranged alternately. Along the direction from the shaft hole to the outer peripheral wall of the iron core body, the polarity of the end face of the first permanent magnet facing away from the shaft hole is opposite to the polarity of the end face of the second permanent magnet facing away from the shaft hole (denoted as the end face on the radially outer side).

[0063] Optionally, the plurality of magnetic flux portions include an N - pole magnetic flux portion and an S - pole magnetic flux portion. The radially outer surface of the N - pole magnetic flux portion is an N - pole. The radially outer surface of the S - pole magnetic flux portion is an S - pole. An N - pole magnetic flux portion is disposed radially outside the permanent magnet whose radially outer surface is an N - pole. And an S - pole magnetic flux portion is disposed radially outside the permanent magnet whose radially outer surface is an S - pole. Therefore, the plurality of N - pole magnetic flux portions and the plurality of S - pole magnetic flux portions are alternately arranged in the circumferential direction. That is, the radially outer magnetic poles of two adjacent magnetic flux portions of the plurality of N - pole magnetic flux portions and the plurality of S - pole magnetic flux portions separated by the magnetic flux shielding structure are different from each other.

[0064] A second aspect of the present invention provides a motor, comprising: a rotor as in the first aspect.

[0065] Since the motor provided by the present invention includes a rotor as in the first aspect, it has all the beneficial effects of the above - mentioned rotor, and will not be elaborated one by one here.

[0066] A third aspect of the present invention provides an electric power steering system, comprising: a rotor as in the first aspect; or a motor as in the second aspect.

[0067] Since the electric power steering system provided by the present invention includes a rotor as in the first aspect, or a motor as in the second aspect, it has all the beneficial effects of the above - mentioned rotor or motor, and will not be elaborated one by one here.

[0068] A fourth aspect of the present invention provides a vehicle, comprising: a rotor as in the first aspect; or a motor as in the second aspect; or an electric power steering system as in the third aspect.

[0069] Since the vehicle provided by the present invention includes a rotor as in the first aspect, or a motor as in the second aspect, or an electric power steering system as in the third aspect, it has all the beneficial effects of one of the above - mentioned rotor, motor, and electric power steering system, and will not be elaborated one by one here.

[0070] It should be noted that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0071] 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

[0072] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0073] Figure 1 A schematic structural view of a first perspective of a rotor according to an embodiment of the present application is shown;

[0074] Figure 2 A schematic structural view of a second perspective of a rotor according to an embodiment of the present application is shown;

[0075] Figure 3 is Figure 2 A partial enlarged view of the A position of the rotor shown;

[0076] Figure 4 A schematic structural view of a core group according to a first embodiment of the present application is shown;

[0077] Figure 5 is Figure 4 A partial enlarged view of the B position of the core group shown;

[0078] Figure 6 A schematic structural view of a core group according to a second embodiment of the present application is shown;

[0079] Figure 7 A schematic structural view of a core group according to a third embodiment of the present application is shown;

[0080] Figure 8 A schematic structural view of a core group according to a fourth embodiment of the present application is shown;

[0081] Figure 9 A data comparison curve graph showing the torque of the present application and a motor having only three-stage skewed poles is shown.

[0082] Wherein, Figures 1 to 8 The corresponding relationship between the reference numerals and the component names in

[0083] 1 Rotor, 10 Core groups, 10a First core group, 10b Second core group, 10c Third core group, 100 Core, 110 Core body, 120 Mounting hole, 130 Magnet slot, 132 First slot section, 134 Second slot section, 136 Third slot section, 200 Flux group, 200a First flux group, 200b Second flux group, 200c Third flux group, 210 Flux shielding structure, 212 Main body part, 214 Connecting end part, 2142 First end section, 2144 Second end section, 2146 Third end section, 220 Flux part, 300 Permanent magnet, 300a First permanent magnet, 300b Second permanent magnet, 310 First permanent magnet segment, 320 Second permanent magnet segment, 322 First permanent magnet end, 324 Second permanent magnet end, 326 Sub-segment, 400 Shaft hole. Detailed implementation manners

[0084] 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.

[0085] In the following description, many specific details are set forth 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.

[0086] The following refers to Figures 1 to 9 A rotor 1, a motor, an electric power steering system and a vehicle according to some embodiments of the present application.

[0087] As Figure 1 、 Figure 2 、 Figure 4 And Figure 5 As shown in, a rotor 1 according to some embodiments of the present application includes a plurality of core groups 10, and each core group 10 includes a core 100 and a plurality of permanent magnets 300.

[0088] The plurality of core groups 10 are stacked.

[0089] Each core group 10 includes a core 100 and a plurality of permanent magnets 300.

[0090] Each core 100 includes a core body 110, a mounting hole 120 and a plurality of magnet slots 130.

[0091] The mounting hole 120 is provided in the core body 110, and the mounting holes 120 of the plurality of core groups 10 penetrate along the axial direction of the rotor 1 to form a shaft hole 400.

[0092] A plurality of magnet slots 130 are provided in the iron core body 110. The plurality of magnet slots 130 are arranged at intervals around the shaft hole 400, and a permanent magnet 300 is arranged in each magnet slot 130.

[0093] The part of the iron core body 110 between the magnet slots 130 and the outer peripheral wall of the iron core body 110 includes a plurality of magnetic flux groups 200, and the plurality of magnetic flux groups 200 are arranged around the shaft hole 400.

[0094] Each magnetic flux group 200 includes a magnetic flux shielding structure 210 and a magnetic flux portion 220 in the circumferential direction of the rotor 1.

[0095] Each magnetic flux portion 220 is disposed opposite to a permanent magnet 300.

[0096] Each magnetic flux shielding structure 210 includes a main body portion 212 and two connecting end portions 214.

[0097] In the circumferential direction of the rotor 1, the main body portion 212 is connected between the two connecting end portions 214.

[0098] For any two adjacent iron core groups 10, the two permanent magnets 300 arranged opposite to each other are arranged staggeredly in the circumferential direction of the rotor 1.

[0099] In the iron core group 10, one of the two adjacent permanent magnets 300 is disposed opposite to a connecting end portion 214 of the magnetic flux shielding structure 210, and the other of the two adjacent permanent magnets 300 is disposed opposite to the other connecting end portion 214 of the magnetic flux shielding structure 210.

[0100] In the circumferential direction of the rotor 1, the portion of the connecting end portion 214 opposite to the permanent magnet 300 includes a first end segment 2142 and a second end segment 2144.

[0101] Wherein, the distance from the outer peripheral wall of the first end segment 2142 to the permanent magnet 300 is less than the distance from the outer peripheral wall of the second end segment 2144 to the permanent magnet 300.

[0102] In this embodiment, the rotor 1 includes a plurality of iron core groups 10, and each iron core group 10 includes an iron core 100 and a plurality of permanent magnets 300.

[0103] Each iron core 100 includes an iron core body 110, a mounting hole 120 and a plurality of magnet slots 130. The mounting holes 120 of the plurality of iron core groups 10 penetrate axially along the rotor 1 to form a shaft hole 400, and a permanent magnet 300 is arranged in each magnet slot 130 of the iron core 100.

[0104] The portion of the iron core body 110 located between the magnet slots 130 and the outer peripheral wall of the iron core body 110 includes a plurality of magnetic flux groups 200, and the plurality of magnetic flux groups 200 are arranged around the shaft hole 400. Each magnetic flux group 200 includes a magnetic flux shielding structure 210 and a magnetic flux portion 220, and the magnetic flux shielding structure 210 and the magnetic flux portion 220 are arranged along the circumferential direction of the rotor 1. Specifically, the magnetic flux shielding structure 210 is connected to one circumferential side of the magnetic flux portion 220.

[0105] The magnetic flux shielding structure 210 includes a main body portion 212 and two connecting end portions 214. Along the circumferential direction of the rotor 1, the main body portion 212 is connected between the two connecting end portions 214.

[0106] In the iron core group 10, two adjacent permanent magnets 300 are respectively denoted as the first permanent magnet 300a and the second permanent magnet 300b, and the two connecting end portions 214 of the magnetic flux shielding structure 210 are respectively denoted as the first connecting end portion and the second connecting end portion. The first connecting end portion is disposed opposite to the first permanent magnet 300a, and the second connecting end portion is disposed opposite to the second permanent magnet 300b. That is to say, the two connecting end portions 214 of the magnetic flux shielding structure 210 are respectively disposed corresponding to the two adjacent permanent magnets 300.

[0107] As Figure 4 shown, the structure of the connecting end portion 214 is further defined such that the portion of the connecting end portion 214 opposite to the permanent magnet 300 includes a first end segment 2142 and a second end segment 2144, and the first end segment 2142 and the second end segment 2144 are arranged along the circumferential direction of the rotor 1. Among them, the distance d2 from the outer peripheral wall of the first end segment 2142 to the permanent magnet 300 is less than the distance d4 from the outer peripheral wall of the second end segment 2144 to the permanent magnet 300 (or less than the distance d5 from the outer peripheral wall of the second end segment 2144 to the permanent magnet 300). That is, the wall surface enclosed by the outer peripheral walls of the first end segment 2142 and the second end segment 2144 is not parallel to the wall surface of the permanent magnet 300 facing away from the shaft hole 400 (that is, the radially outer wall surface of the permanent magnet 300).

[0108] It can be understood that, as Figure 4As shown, along the circumferential direction of the rotor 1, the magnet slot 130 includes a first slot section 132, a second slot section 134, and a third slot section 136. The first slot section 132 is connected between the second slot section 134 and the third slot section 136, and the permanent magnet 300 is disposed in the first slot section 132. A part of the main body 212 of the magnetic flux shielding structure 210 is disposed opposite to the third slot section 136 of a magnet slot 130, and another part of the main body 212 of the magnetic flux shielding structure 210 is disposed opposite to the second slot section 134 of an adjacent magnet slot 130. That is to say, the first slot section 132 of the magnet slot 130 is a magnetic section, and the second slot section 134 and the third slot section 136 are both non-magnetic sections. The two non-magnetic sections are located on the circumferential two sides of the magnetic section. Therefore, the non-magnetic sections suppress the magnetic flux leaking from the two circumferential ends of the permanent magnet 300.

[0109] Optionally, the non-magnetic section is a gap.

[0110] Optionally, a non-magnetic component such as resin is inserted into the non-magnetic section.

[0111] That is to say, by defining the structure of the outer peripheral wall of the iron core body 110 to adjust the gap between the rotor 1 and the stator of the motor, and to adjust the direction of the magnetic lines of force, the magnetic flux leakage can be effectively reduced, the decrease of the magnetic flux part 220 of the rotor 1 can be suppressed, and the decrease of the torque of the motor can be suppressed, which is beneficial to improving the output torque of the motor.

[0112] Optionally, the part between the magnet slot 130 and the outer peripheral wall of the iron core body 110 includes a plurality of magnetic flux shielding structures 210 and a plurality of magnetic flux parts 220. Along the circumferential direction of the rotor 1, the plurality of magnetic flux shielding structures 210 and the plurality of magnetic flux parts 220 are arranged alternately, that is, a magnetic flux part 220 is disposed between any two adjacent magnetic flux shielding structures 210.

[0113] It can be understood that the motor includes a rotating shaft, and the rotating shaft is inserted through the shaft hole 400.

[0114] It can be understood that two relatively arranged permanent magnets 300 in any two adjacent iron core groups 10 are arranged staggeredly in the circumferential direction of the rotor 1. The two relatively arranged permanent magnets 300 in any two adjacent iron core groups 10 are respectively denoted as the first permanent magnet 300a and the second permanent magnet 300b. A part of the first permanent magnet 300a is arranged opposite to the second permanent magnet 300b. Along the circumferential direction of the rotor 1, another part of the first permanent magnet 300a extends out of the outer edge of the second permanent magnet 300b. In other words, the center lines of the two corresponding permanent magnets 300 in any two adjacent iron core groups 10 do not overlap, but are offset by a certain angle, so that the two corresponding permanent magnets 300 in any two adjacent iron core groups 10 do not completely overlap, but partially overlap and partially stagger. In this way, the rotor 1 has a segmented skewed pole structure, which can effectively reduce the cogging torque and torque ripple of the motor used by the rotor 1, and can reduce magnetic leakage and improve the output torque of the motor.

[0115] It can be understood that each magnetic flux portion 220 is arranged opposite to a permanent magnet 300. The magnetic flux portion 220 is located on the side of the corresponding permanent magnet 300 away from the shaft hole 400, that is, the magnetic flux portion 220 is located on the radial outer side of the corresponding permanent magnet 300. The magnetic flux portion 220 serves as a magnetic path between the permanent magnet 300 located on its radial inner side and the outer peripheral wall of the iron core body 110, and the magnetic flux portion 220 has a magnetic conduction function.

[0116] Optionally, the first end segment 2142 is located between the second end segment 2144 and the main body portion 212.

[0117] Optionally, the second end segment 2144 is located between the first end segment 2142 and the magnetic flux portion 220.

[0118] In some embodiments, optionally, as Figure 4 and Figure 5 shown, along the circumferential direction of the rotor 1, the part of the connecting end 214 arranged opposite to the permanent magnet 300 further includes a third end segment 2146.

[0119] The first end segment 2142 is connected between the second end segment 2144 and the third end segment 2146.

[0120] Wherein, the distance from the outer peripheral wall of the first end segment 2142 to the permanent magnet 300 is less than the distance from the outer peripheral wall of the third end segment 2146 to the permanent magnet 300.

[0121] In this embodiment, the structure of the iron core body 110 is further defined such that, along the circumferential direction of the rotor 1, the portion of the connecting end portion 214 opposite to the permanent magnet 300 further includes a third end portion segment 2146, and the first end portion segment 2142 is connected between the second end portion segment 2144 and the third end portion segment 2146. That is to say, the wall surface enclosed by the outer peripheral walls of the first end portion segment 2142, the second end portion segment 2144, and the third end portion segment 2146 is not parallel to the wall surface of the permanent magnet 300 facing away from the shaft hole 400 (that is, the radially outer wall surface of the permanent magnet 300).

[0122] Wherein, as Figure 4 and Figure 5 shown, the distance d2 from the outer peripheral wall of the first end portion segment 2142 to the permanent magnet 300 is less than the distance d5 from the outer peripheral wall of the second end portion segment 2144 to the permanent magnet 300, and the distance d2 from the outer peripheral wall of the first end portion segment 2142 to the permanent magnet 300 is less than the distance d4 from the outer peripheral wall of the third end portion segment 2146 to the permanent magnet 300. That is to say, the portion of the connecting end portion 214 opposite to the permanent magnet 300 has a structure that is thin in the middle and thick at both ends. This setting defines the structure of the outer peripheral wall of the iron core body 110 to adjust the gap between the rotor 1 and the stator of the motor, to adjust the direction of the magnetic field lines, which can effectively reduce magnetic leakage, suppress the decrease of the magnetic flux portion 220 of the rotor 1, and can suppress the decrease of the torque of the motor, which is beneficial to improving the output torque of the motor and improving problems such as the decrease of the output torque caused by segmented skewed poles.

[0123] Optionally, the distance from the outer peripheral wall of the second end portion segment 2144 to the permanent magnet 300 is equal to the distance from the outer peripheral wall of the third end portion segment 2146 to the permanent magnet 300.

[0124] Optionally, the distance from the outer peripheral wall of the second end portion segment 2144 to the permanent magnet 300 is greater than the distance from the outer peripheral wall of the third end portion segment 2146 to the permanent magnet 300.

[0125] Optionally, the distance from the outer peripheral wall of the second end portion segment 2144 to the permanent magnet 300 is less than the distance from the outer peripheral wall of the third end portion segment 2146 to the permanent magnet 300.

[0126] In some embodiments, optionally, the connection between the outer peripheral walls of the first end portion segment 2142 and the second end portion segment 2144 has a smooth transition.

[0127] And / or the connection between the outer peripheral walls of the first end portion segment 2142 and the third end portion segment 2146 has a smooth transition.

[0128] In this embodiment, the structure of the iron core body 110 is further defined such that the connection between the outer peripheral walls of the first end portion segment 2142 and the second end portion segment 2144 has a smooth transition, and / or the connection between the outer peripheral walls of the first end portion segment 2142 and the third end portion segment 2146 has a smooth transition.

[0129] That is to say, the wall surface enclosed by the outer peripheral walls of the first end portion segment 2142 and the second end portion segment 2144 has a smooth transition. In this way, the problem of stress concentration will not occur, and the effective cooperation between the stator and the rotor 1 during the operation of the motor can be ensured.

[0130] And / or the wall surface enclosed by the outer peripheral walls of the first end portion segment 2142 and the third end portion segment 2146 has a smooth transition. In this way, the problem of stress concentration will not occur, and the effective cooperation between the stator and the rotor 1 during the operation of the motor can be ensured.

[0131] In some embodiments, optionally, as Figure 4 shown, the distance from the outer peripheral wall of the magnetic flux portion 220 to the permanent magnet 300 is greater than the distance from the outer peripheral wall of the connecting end portion 214 to the permanent magnet 300.

[0132] In this embodiment, the structure of the iron core body 110 is further defined such that the distance d1 from the outer peripheral wall of the magnetic flux portion 220 to the permanent magnet 300 is greater than the distance from the outer peripheral wall of the connecting end portion 214 to the permanent magnet 300. The magnetic flux portion 220 and the magnetic flux shielding structure 210 cooperate to define the structure of the outer peripheral wall of the iron core body 110. In this way, the gap between the rotor 1 and the stator of the motor can be adjusted to adjust the direction of the magnetic lines of force, effectively reducing magnetic leakage, suppressing the decrease of the magnetic flux portion 220 of the rotor 1, and suppressing the decrease of the torque of the motor, which is beneficial to improving the output torque of the motor.

[0133] Wherein, d1 is greater than d2, d1 is greater than d3, d1 is greater than d4, and d1 is greater than d5.

[0134] In some embodiments, optionally, the outer peripheral wall of the magnetic flux portion 220 is a first arc-shaped wall protruding in a direction away from the shaft hole 400.

[0135] The outer peripheral wall of the main body portion 212 is a second arc-shaped wall protruding in a direction away from the shaft hole 400.

[0136] The outer peripheral wall of the connecting end portion 214 is a third arc-shaped wall recessed in a direction towards the shaft hole 400.

[0137] The center of the circle corresponding to the first arc-shaped wall is located on one side of the center of the shaft hole 400, and the center of the circle corresponding to the second arc-shaped wall coincides with the center of the shaft hole 400.

[0138] In this embodiment, the mating structure of the magnetic flux portion 220 and the magnetic flux shielding structure 210 is further defined. The outer peripheral wall of the magnetic flux portion 220 is a first arc-shaped wall, and the first arc-shaped wall protrudes in a direction away from the shaft hole 400. The outer peripheral wall of the main body portion 212 is a second arc-shaped wall, and the second arc-shaped wall protrudes in a direction away from the shaft hole 400. The outer peripheral wall of the connecting end portion 214 is a third arc-shaped wall, and the third arc-shaped wall is recessed in a direction toward the shaft hole 400.

[0139] Among them, the center of the circle corresponding to the first arc-shaped wall is located on one side of the center of the shaft hole 400, and the center of the circle corresponding to the second arc-shaped wall coincides with the center of the shaft hole 400. That is, the center of the circle corresponding to the first arc-shaped wall is arranged away from the center of the shaft hole 400.

[0140] In this way, the structure of the outer peripheral wall of the iron core body 110 is defined. The purpose of adjusting the gap between the stator and the rotor 1 can be achieved.

[0141] In some embodiments, optionally, the magnetic flux portions 220 are symmetrically arranged along the center line of the corresponding magnetic pole.

[0142] In this embodiment, the magnetic flux portions 220 are symmetrically arranged along the center line of the corresponding magnetic pole, that is, the center line of the magnetic flux portion 220 coincides with the center line of the corresponding magnetic pole. The center line of the magnetic pole is simply referred to as the d-axis.

[0143] The magnetic flux shielding structures 210 are symmetrically arranged along the center line between the poles, that is, the center line of the magnetic flux shielding structure 210 coincides with the center line between the poles. The center line between the poles is simply referred to as the q-axis.

[0144] That is to say, the magnetic path where the magnetic flux portion 220 is located is the d-axis magnetic path. The magnetic path where the magnetic flux shielding structure 210 is located is the q-axis magnetic path. The structural setting of the magnetic flux portion 220 can effectively reduce the main torque ripple order and the radial electromagnetic force density under high torque conditions of the motor. The structural setting of the magnetic flux shielding structure 210 can effectively reduce the main torque ripple order and the radial electromagnetic force density under low torque conditions of the motor. And it has little influence on the magnitude of the output torque of the motor.

[0145] This setting causes the d-axis and q-axis inductances of the motor to decrease simultaneously. It not only does not affect the saliency ratio of the motor (the saliency ratio directly affects the torque output under high-speed performance of the motor), but also increases the peak power of the motor, reduces the armature reaction of the motor, and has little influence on the peak torque performance of the motor.

[0146] In some embodiments, optionally, the two connecting end portions 214 of each magnetic flux shielding structure 210 are symmetrically arranged along the center line between the poles.

[0147] In this embodiment, the structure of the magnetic flux shielding structure 210 is further defined.

[0148] Among them, the magnetic flux shielding structure 210 includes a main body portion 212 and two connecting end portions 214. Along the circumferential direction of the rotor 1, the main body portion 212 is connected between the two connecting end portions 214, and the two connecting end portions 214 are symmetrically arranged along the inter-pole center line. This setting can stabilize the performance of the motor during forward and reverse rotations and meet the diverse usage requirements of users.

[0149] At the same time, this structural setting facilitates installation and improves assembly efficiency, and can ensure the yield rate of products. If the shapes of the two connecting end portions 214 are different and the operator misinstalls them, it will affect the performance of the motor.

[0150] Moreover, this structural setting makes the magnetic field lines distribute more uniformly, and the air-gap magnetic field distributes more uniformly and symmetrically. 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.

[0151] In addition, this structural setting can simplify the processing difficulty and is conducive to improving the processing efficiency of products.

[0152] In some embodiments, optionally, as Figure 1 、 Figure 2 and Figure 3 shown, the number of the iron core groups 10 is greater than or equal to three.

[0153] Among three adjacent iron core groups 10, the three relatively arranged magnetic flux groups 200 are respectively denoted as a first magnetic flux group 200a, a second magnetic flux group 200b, and a third magnetic flux group 200c.

[0154] The second magnetic flux group 200b is located between the first magnetic flux group 200a and the third magnetic flux group 200c.

[0155] A part of the magnetic flux shielding structure 210 of the second magnetic flux group 200b overlaps with the magnetic flux shielding structure 210 of the first magnetic flux group 200a.

[0156] A part of the magnetic flux portion 220 of the second magnetic flux group 200b overlaps with the magnetic flux shielding structure 210 of the first magnetic flux group 200a.

[0157] A part of the magnetic flux shielding structure 210 of the third magnetic flux group 200c overlaps with the magnetic flux shielding structure 210 of the second magnetic flux group 200b.

[0158] A part of the magnetic flux portion 220 of the third magnetic flux group 200c overlaps with the magnetic flux shielding structure 210 of the second magnetic flux group 200b.

[0159] In this embodiment, the structure of the rotor 1 is further defined.

[0160] The number of the iron core groups 10 is greater than or equal to three. Among three adjacent iron core groups 10, three relatively arranged magnetic flux groups 200 are respectively denoted as a first magnetic flux group 200a, a second magnetic flux group 200b, and a third magnetic flux group 200c. For example, three adjacent iron core groups 10 are respectively denoted as a first iron core group 10a, a second iron core group 10b, and a third iron core group 10c, and the second iron core group 10b is located between the first iron core group 10a and the third iron core group 10c. Three relatively arranged magnetic flux groups 200 of the first iron core group 10a, the second iron core group 10b, and the third iron core group 10c are respectively denoted as the first magnetic flux group 200a, the second magnetic flux group 200b, and the third magnetic flux group 200c. The first iron core group 10a includes the first magnetic flux group 200a, the second iron core group 10b includes the second magnetic flux group 200b, and the third iron core group 10c includes the third magnetic flux group 200c.

[0161] Wherein, a part of the magnetic flux shielding structure 210 of the second magnetic flux group 200b overlaps with the magnetic flux shielding structure 210 of the first magnetic flux group 200a, and a part of the magnetic flux portion 220 of the second magnetic flux group 200b overlaps with the magnetic flux shielding structure 210 of the first magnetic flux group 200a; a part of the magnetic flux shielding structure 210 of the third magnetic flux group 200c overlaps with the magnetic flux shielding structure 210 of the second magnetic flux group 200b, and a part of the magnetic flux portion 220 of the third magnetic flux group 200c overlaps with the magnetic flux shielding structure 210 of the second magnetic flux group 200b.

[0162] That is to say, along the axial direction of the rotor 1, in the projection of the first magnetic flux group 200a on the second iron core group 10b, a part of the magnetic flux shielding structure 210 of the second magnetic flux group 200b overlaps with the magnetic flux shielding structure 210 of the first magnetic flux group 200a, and a part of the magnetic flux portion 220 of the second magnetic flux group 200b overlaps with the magnetic flux shielding structure 210 of the first magnetic flux group 200a.

[0163] Along the axial direction of the rotor 1, in the projection of the third magnetic flux group 200c on the second iron core group 10b, a part of the magnetic flux shielding structure 210 of the third magnetic flux group 200c overlaps with the magnetic flux shielding structure 210 of the second magnetic flux group 200b, and a part of the magnetic flux portion 220 of the third magnetic flux group 200c overlaps with the magnetic flux shielding structure 210 of the second magnetic flux group 200b.

[0164] This setting can effectively reduce the torque ripple of the motor, effectively improve the effective utilization rate of the magnetic flux, reduce the magnetic leakage, and improve problems such as the output torque drop caused by the segmented skewed poles.

[0165] In some embodiments, optionally, as Figure 4 shown, the permanent magnet 300 is a bar-shaped permanent magnet.

[0166] In this embodiment, the shape of the permanent magnet 300 is defined. Specifically, the permanent magnet 300 is a bar-shaped permanent magnet.

[0167] In some embodiments, optionally, as Figure 6 shown, the permanent magnet 300 includes a plurality of first permanent magnet segments 310.

[0168] The plurality of first permanent magnet segments 310 are arranged in a strip shape.

[0169] In this embodiment, the structure of the permanent magnet 300 is further defined such that the permanent magnet 300 includes a plurality of first permanent magnet segments 310, and the plurality of first permanent magnet segments 310 are arranged in a strip shape. This setting enables the first permanent magnet segments 310 made of the same material or different materials to be set according to specific actual usage requirements. In this way, the production cost and service performance of the rotor 1 can be taken into account.

[0170] For example, a part of the first permanent magnet segments 310 are made of a material with a higher cost, and another part of the first permanent magnet segments 310 are made of a material with a lower cost. To reduce the production cost of the rotor 1 while ensuring the service performance of the rotor 1.

[0171] In some embodiments, optionally, as Figure 7 shown, the permanent magnet 300 includes two second permanent magnet segments 320.

[0172] Each second permanent magnet segment 320 includes a first permanent magnet end 322 and a second permanent magnet end 324.

[0173] The first permanent magnet end 322 is located between the shaft hole 400 and the second permanent magnet end 324.

[0174] The first permanent magnet ends 322 of the two second permanent magnet segments 320 are adjacent to each other.

[0175] The second permanent magnet ends 324 of the two second permanent magnet segments 320 are away from each other.

[0176] In this embodiment, the structure of the permanent magnet 300 is further defined such that the permanent magnet 300 includes two second permanent magnet segments 320, and each second permanent magnet segment 320 includes a first permanent magnet end 322 and a second permanent magnet end 324.

[0177] Wherein, the first permanent magnet end 322 is located between the shaft hole 400 and the second permanent magnet end 324, the first permanent magnet ends 322 of the two second permanent magnet segments 320 are adjacent to each other, and the second permanent magnet ends 324 of the two second permanent magnet segments 320 are away from each other.

[0178] That is, the two second permanent magnet segments 320 are arranged in a "V" shape, and the opening of the "V" shape faces the outer edge of the iron core body 110.

[0179] In some embodiments, optionally, as Figure 8 shown, the second permanent magnet segment 320 includes a plurality of sub - segments 326, and the plurality of sub - segments 326 are arranged in a strip shape.

[0180] In this embodiment, the structure of the second permanent magnet segment 320 is further defined such that the second permanent magnet segment 320 includes a plurality of sub-segments 326, and the plurality of sub-segments 326 are arranged in a strip shape. This setting enables the sub-segments 326 made of the same or different materials to be set according to specific actual usage requirements. In this way, the production cost and service performance of the rotor 1 can be taken into account.

[0181] For example, some of the sub-segments 326 are made of materials with higher costs, and some of the sub-segments 326 are made of materials with lower costs. To reduce the production cost of the rotor 1 while ensuring the service performance of the rotor 1.

[0182] In some embodiments, optionally, in the iron core group 10, the polarities of the end faces of two adjacent permanent magnets 300 facing away from the shaft hole 400 are different.

[0183] In this embodiment, the structure of the iron core group 10 is defined such that in the iron core group 10, the polarities of the end faces of two adjacent permanent magnets 300 facing away from the shaft hole 400 are different. For example, the plurality of permanent magnets 300 include a plurality of first permanent magnets 300a and a plurality of second permanent magnets 300b, and the plurality of first permanent magnets 300a and the plurality of second permanent magnets 300b are arranged alternately. The polarity of the radially outer side surface of the first permanent magnet 300a is opposite to the polarity of the radially outer side surface of the second permanent magnet 300b.

[0184] Optionally, the plurality of magnetic flux portions 220 include an N-pole magnetic flux portion and an S-pole magnetic flux portion. The surface of the radially outer side of the N-pole magnetic flux portion is an N-pole. The surface of the radially outer side of the S-pole magnetic flux portion is an S-pole. An N-pole magnetic flux portion is arranged on the radially outer side of the permanent magnet 300 whose magnetic pole on the radially outer side surface is an N-pole. And, an S-pole magnetic flux portion is arranged on the radially outer side of the permanent magnet 300 whose magnetic pole on the radially outer side surface is an S-pole. Therefore, the plurality of N-pole magnetic flux portions and the plurality of S-pole magnetic flux portions are arranged alternately in the circumferential direction. That is, the magnetic poles on the radially outer sides of two adjacent magnetic flux portions 220 of the plurality of N-pole magnetic flux portions and the plurality of S-pole magnetic flux portions separated by the magnetic flux shielding structure 210 are different from each other.

[0185] According to another aspect of the present application, a motor includes: a rotor 1 as in any of the above embodiments.

[0186] The motor provided by the present invention includes the rotor 1 as in any of the above embodiments, and therefore has all the beneficial effects of the above rotor 1, which will not be elaborated one by one here.

[0187] The motor includes a rotor 1.

[0188] The rotor 1 includes a plurality of iron core groups 10, and each iron core group 10 includes an iron core 100 and a plurality of permanent magnets 300.

[0189] Each iron core 100 includes an iron core body 110, mounting holes 120, and a plurality of magnet slots 130. The mounting holes 120 of the plurality of iron core groups 10 penetrate axially along the rotor 1 to form an axial hole 400. A permanent magnet 300 is disposed in each magnet slot 130 of the iron core 100.

[0190] The portion of the iron core body 110 between the magnet slots 130 and the outer peripheral wall of the iron core body 110 includes a plurality of magnetic flux groups 200, and the plurality of magnetic flux groups 200 are arranged around the axial hole 400. Each magnetic flux group 200 includes a magnetic flux shielding structure 210 and a magnetic flux portion 220, and the magnetic flux shielding structure 210 and the magnetic flux portion 220 are arranged circumferentially along the rotor 1. Specifically, the magnetic flux shielding structure 210 is connected to the circumferential side of the magnetic flux portion 220.

[0191] The magnetic flux shielding structure 210 includes a main body portion 212 and two connecting end portions 214. Along the circumferential direction of the rotor 1, the main body portion 212 is connected between the two connecting end portions 214.

[0192] In the iron core group 10, two adjacent permanent magnets 300 are respectively denoted as a first permanent magnet 300a and a second permanent magnet 300b, and the two connecting end portions 214 of the magnetic flux shielding structure 210 are respectively denoted as a first connecting end portion and a second connecting end portion. The first connecting end portion and the first permanent magnet 300a are disposed opposite to each other, and the second connecting end portion and the second permanent magnet 300b are disposed opposite to each other. That is to say, the two connecting end portions 214 of the magnetic flux shielding structure 210 are respectively arranged corresponding to two adjacent permanent magnets 300.

[0193] As Figure 4 shown, the structure of the connecting end portion 214 is further defined such that the portion of the connecting end portion 214 opposite to the permanent magnet 300 includes a first end segment 2142 and a second end segment 2144, and the first end segment 2142 and the second end segment 2144 are arranged circumferentially along the rotor 1. Among them, the distance d2 from the outer peripheral wall of the first end segment 2142 to the permanent magnet 300 is less than the distance d4 from the outer peripheral wall of the second end segment 2144 to the permanent magnet 300 (or less than the distance d5 from the outer peripheral wall of the second end segment 2144 to the permanent magnet 300). That is, the wall surface enclosed by the outer peripheral walls of the first end segment 2142 and the second end segment 2144 is not parallel to the wall surface of the permanent magnet 300 facing away from the axial hole 400 (that is, the radially outer wall surface of the permanent magnet 300).

[0194] It can be understood that, as Figure 4As shown, along the circumferential direction of the rotor 1, the magnet slot 130 includes a first slot section 132, a second slot section 134, and a third slot section 136. The first slot section 132 is connected between the second slot section 134 and the third slot section 136, and the permanent magnet 300 is disposed in the first slot section 132. A part of the main body 212 of the magnetic flux shielding structure 210 is disposed opposite to the third slot section 136 of a magnet slot 130, and another part of the main body 212 of the magnetic flux shielding structure 210 is disposed opposite to the second slot section 134 of an adjacent magnet slot 130. That is to say, the first slot section 132 of the magnet slot 130 is a magnetic section, and the second slot section 134 and the third slot section 136 are both non-magnetic sections. The two non-magnetic sections are located on the circumferential two sides of the magnetic section. Therefore, the non-magnetic sections inhibit the magnetic flux leaking from the two circumferential ends of the permanent magnet 300.

[0195] Optionally, the non-magnetic section is a gap.

[0196] Optionally, non-magnetic components such as resin are inserted into the non-magnetic section.

[0197] That is to say, by defining the structure of the outer peripheral wall of the iron core body 110 to adjust the gap between the rotor 1 and the stator of the motor, and to adjust the direction of the magnetic lines of force, the magnetic leakage can be effectively reduced, the decrease of the magnetic flux part 220 of the rotor 1 can be inhibited, and the decrease of the torque of the motor can be inhibited, which is beneficial to improving the output torque of the motor.

[0198] Optionally, the part between the magnet slot 130 and the outer peripheral wall of the iron core body 110 includes a plurality of magnetic flux shielding structures 210 and a plurality of magnetic flux parts 220. Along the circumferential direction of the rotor 1, the plurality of magnetic flux shielding structures 210 and the plurality of magnetic flux parts 220 are arranged alternately, that is, a magnetic flux part 220 is disposed between any two adjacent magnetic flux shielding structures 210.

[0199] It can be understood that the motor includes a rotating shaft, and the rotating shaft is inserted through the shaft hole 400.

[0200] It can be understood that the two permanent magnets 300 arranged opposite to each other in any two adjacent core groups 10 are arranged alternately in the circumferential direction of the rotor 1. The two permanent magnets 300 arranged opposite to each other in any two adjacent core groups 10 are respectively recorded as the first permanent magnet 300a and the second permanent magnet 300b. A part of the first permanent magnet 300a is arranged opposite to the second permanent magnet 300b, and along the circumferential direction of the rotor 1, another part of the first permanent magnet 300a extends out of the outer edge of the second permanent magnet 300b. In other words, the center lines of the two corresponding permanent magnets 300 in any two adjacent core groups 10 are not overlapped, but staggered at a certain angle, so that the two corresponding permanent magnets 300 in any two adjacent core groups 10 are not completely overlapped, but partially overlapped and partially misaligned. In this way, the rotor 1 has a segmented oblique pole structure, which can effectively reduce the cogging torque and torque pulsation of the motor used by the rotor 1, and can reduce magnetic leakage and improve the output torque of the motor.

[0201] It can be understood that each magnetic flux portion 220 is arranged opposite to a permanent magnet 300, and the magnetic flux portion 220 is located on the side of the corresponding permanent magnet 300 away from the axial hole 400, that is, the magnetic flux portion 220 is located on the radial outside of the corresponding permanent magnet 300, and the magnetic flux portion 220 serves as a magnetic circuit between the permanent magnet 300 located on its radial inside and the outer peripheral wall of the core body 110, and the magnetic flux portion 220 has a magnetic conductivity function.

[0202] According to some further embodiments of the present application, an electric power steering system includes: a rotor 1 as in any of the above embodiments; or a motor as in the above embodiments.

[0203] The electric power steering system provided by the present invention includes the rotor 1 of any of the above embodiments, or the motor of the above embodiments, and therefore has all the beneficial effects of the above rotor 1 or motor, which are not described one by one here.

[0204] According to some further embodiments of the present application, a vehicle includes: a rotor 1 as in any of the above embodiments; or a motor as in the above embodiments; or an electric power steering system as in the above embodiments.

[0205] The vehicle provided by the present invention includes the rotor 1 as any one of the above embodiments, or the motor as the above embodiments, or the electric power steering system as the above embodiments, and therefore has all the beneficial effects of one of the above rotor 1, motor and electric power steering system, which are not described one by one here.

[0206] It is worth noting that the vehicle can be a new energy vehicle, which includes pure electric vehicles, extended-range electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0207] The rotor 1 includes a plurality of iron core groups 10, and each iron core group 10 includes an iron core 100 and a plurality of permanent magnets 300.

[0208] Each iron core 100 includes an iron core body 110, a mounting hole 120, and a plurality of magnet grooves 130. The mounting holes 120 of the plurality of iron core groups 10 penetrate axially along the rotor 1 to form a shaft hole 400, and one permanent magnet 300 is arranged in each magnet groove 130 of the iron core 100.

[0209] The portion of the iron core body 110 between the magnet groove 130 and the outer peripheral wall of the iron core body 110 includes a plurality of magnetic flux groups 200, and the plurality of magnetic flux groups 200 are arranged around the shaft hole 400. Each magnetic flux group 200 includes a magnetic flux shielding structure 210 and a magnetic flux portion 220, and the magnetic flux shielding structure 210 and the magnetic flux portion 220 are arranged circumferentially along the rotor 1. Specifically, the magnetic flux shielding structure 210 is connected to one circumferential side of the magnetic flux portion 220.

[0210] The magnetic flux shielding structure 210 includes a main body portion 212 and two connecting end portions 214. Along the circumferential direction of the rotor 1, the main body portion 212 is connected between the two connecting end portions 214.

[0211] In the iron core group 10, two adjacent permanent magnets 300 are respectively denoted as a first permanent magnet 300a and a second permanent magnet 300b, and the two connecting end portions 214 of the magnetic flux shielding structure 210 are respectively denoted as a first connecting end portion and a second connecting end portion. The first connecting end portion is disposed opposite to the first permanent magnet 300a, and the second connecting end portion is disposed opposite to the second permanent magnet 300b. That is to say, the two connecting end portions 214 of the magnetic flux shielding structure 210 are respectively disposed corresponding to two adjacent permanent magnets 300.

[0212] As Figure 4 shown, the structure of the connecting end portion 214 is further defined such that the portion of the connecting end portion 214 opposite to the permanent magnet 300 includes a first end segment 2142 and a second end segment 2144, and the first end segment 2142 and the second end segment 2144 are arranged circumferentially along the rotor 1. Among them, the distance d2 from the outer peripheral wall of the first end segment 2142 to the permanent magnet 300 is less than the distance d4 from the outer peripheral wall of the second end segment 2144 to the permanent magnet 300 (or less than the distance d5 from the outer peripheral wall of the second end segment 2144 to the permanent magnet 300). That is to say, the wall surface enclosed by the outer peripheral walls of the first end segment 2142 and the second end segment 2144 is not parallel to the wall surface of the permanent magnet 300 facing away from the shaft hole 400 (that is, the radially outer wall surface of the permanent magnet 300).

[0213] It can be understood that, as Figure 4As shown, along the circumferential direction of the rotor 1, the magnet slot 130 includes a first slot section 132, a second slot section 134, and a third slot section 136. The first slot section 132 is connected between the second slot section 134 and the third slot section 136, and the permanent magnet 300 is disposed in the first slot section 132. A part of the main body 212 of the magnetic flux shielding structure 210 is disposed opposite to the third slot section 136 of one magnet slot 130, and another part of the main body 212 of the magnetic flux shielding structure 210 is disposed opposite to the second slot section 134 of an adjacent magnet slot 130. That is to say, the first slot section 132 of the magnet slot 130 is a magnetic section, and both the second slot section 134 and the third slot section 136 are non-magnetic sections. The two non-magnetic sections are located on the circumferential two sides of the magnetic section. Therefore, the non-magnetic sections suppress the magnetic flux leaking from the two circumferential ends of the permanent magnet 300.

[0214] Optionally, the non-magnetic section is a gap.

[0215] Optionally, a non-magnetic component such as resin is inserted into the non-magnetic section.

[0216] That is to say, by defining the structure of the outer peripheral wall of the iron core body 110 to adjust the gap between the rotor 1 and the stator of the motor, so as to adjust the direction of the magnetic lines of force, the magnetic leakage can be effectively reduced, the decrease of the magnetic flux part 220 of the rotor 1 can be suppressed, and the decrease of the torque of the motor can be suppressed, which is beneficial to improving the output torque of the motor.

[0217] Optionally, the part between the magnet slot 130 and the outer peripheral wall of the iron core body 110 includes a plurality of magnetic flux shielding structures 210 and a plurality of magnetic flux parts 220. Along the circumferential direction of the rotor 1, the plurality of magnetic flux shielding structures 210 and the plurality of magnetic flux parts 220 are arranged alternately, that is, a magnetic flux part 220 is disposed between any two adjacent magnetic flux shielding structures 210.

[0218] It can be understood that the motor includes a rotating shaft, and the rotating shaft is inserted through the shaft hole 400.

[0219] It can be understood that the two permanent magnets 300 arranged opposite to each other in any two adjacent core groups 10 are arranged alternately in the circumferential direction of the rotor 1. The two permanent magnets 300 arranged opposite to each other in any two adjacent core groups 10 are respectively recorded as the first permanent magnet 300a and the second permanent magnet 300b. A part of the first permanent magnet 300a is arranged opposite to the second permanent magnet 300b, and along the circumferential direction of the rotor 1, another part of the first permanent magnet 300a extends out of the outer edge of the second permanent magnet 300b. In other words, the center lines of the two corresponding permanent magnets 300 in any two adjacent core groups 10 are not overlapped, but staggered at a certain angle, so that the two corresponding permanent magnets 300 in any two adjacent core groups 10 are not completely overlapped, but partially overlapped and partially misaligned. In this way, the rotor 1 has a segmented oblique pole structure, which can effectively reduce the cogging torque and torque pulsation of the motor used by the rotor 1, and can reduce magnetic leakage and improve the output torque of the motor.

[0220] It can be understood that each magnetic flux portion 220 is arranged opposite to a permanent magnet 300, and the magnetic flux portion 220 is located on the side of the corresponding permanent magnet 300 away from the axial hole 400, that is, the magnetic flux portion 220 is located on the radial outside of the corresponding permanent magnet 300, and the magnetic flux portion 220 serves as a magnetic circuit between the permanent magnet 300 located on its radial inside and the outer peripheral wall of the core body 110, and the magnetic flux portion 220 has a magnetic conductivity function.

[0221] Optionally, the motor (e.g., a rotating motor) includes a first core group 10a, a second core group 10b, and a third core group 10c. The first core group 10a, the second core group 10b, and the third core group 10c are arranged along the axial direction of the shaft hole 400. The shaft hole 400 is used to place the rotating shaft of the motor. The portion of the core body 110 between the shaft hole 400 and the outer peripheral wall is provided with a plurality of magnetic steel grooves 130, and the plurality of magnetic steel grooves 130 are arranged at intervals around the shaft hole 400. The magnetic steel grooves 130 are used to place the permanent magnets 300.

[0222] The portion of the core body 110 between the magnetic steel slot 130 and the outer peripheral wall of the core body 110 includes a plurality of magnetic flux groups 200, which are arranged around the circumference of the rotor 1, and each magnetic flux group 200 includes a magnetic flux shielding structure 210 and a magnetic flux portion 220. A magnetic flux portion 220 is provided between any two adjacent magnetic flux shielding structures 210.

[0223] The flux shielding structure 210 has connecting ends 214 at both ends thereof which are symmetrically arranged along the center line of the magnetic pole.

[0224] A part of the magnetic flux shielding structure 210 of the second magnetic flux group 200b overlaps with the magnetic flux shielding structure 210 of the first magnetic flux group 200a, and a part of the magnetic flux portion 220 of the second magnetic flux group 200b overlaps with the magnetic flux shielding structure 210 of the first magnetic flux group 200a; a part of the magnetic flux shielding structure 210 of the third magnetic flux group 200c overlaps with the magnetic flux shielding structure 210 of the second magnetic flux group 200b, and a part of the magnetic flux portion 220 of the third magnetic flux group 200c overlaps with the magnetic flux shielding structure 210 of the second magnetic flux group 200b.

[0225] In the first iron core group 10a, the second iron core group 10b, and the third iron core group 10c, the polarities of the radially overlapping magnetic flux portions 220 are the same. The magnetic flux portions 220 of each iron core group 10 have a certain phase relationship in space, which can effectively improve the torque ripple of the motor. The magnetic flux shielding structure 210 of each iron core group 10 and its end design can cleverly improve the leakage magnetic flux, suppress the decrease of the magnetic flux portion 220, and suppress the torque decrease of the rotating motor.

[0226] Optionally, the shape of the rotor 1 is a cylindrical structure.

[0227] Each iron core group 10 includes an iron core 100 and a plurality of permanent magnets 300. Each iron core 100 includes an iron core body 110, a mounting hole 120, and a plurality of magnetic steel grooves 130. The magnetic steel grooves 130 are formed on the iron core body 110, and the plurality of magnetic steel grooves 130 are arranged at equal intervals along the circumference of the mounting hole 120. Each magnetic steel groove 130 is provided with a permanent magnet 300. In the iron core group 10, the polarities of the radially outer sides of two adjacent permanent magnets 300 are different from each other.

[0228] A plurality of magnetic flux shielding structures 210 are magnetically saturated between the magnetic poles of the circumferentially adjacent permanent magnets 300, and the center line of the magnetic flux shielding structure 210 coincides with the q-axis.

[0229] The magnetic flux portion 220 is located radially outside the permanent magnet 300 and is a magnetic path between the permanent magnet 300 and the outer peripheral wall of the rotor 1. The center line of the magnetic flux portion 220 coincides with the d-axis.

[0230] A plurality of magnetic flux shielding structures 210 and a plurality of magnetic flux portions 220 are alternately arranged in the circumferential direction of the rotor 1.

[0231] The magnetic flux shielding structure 210 has connecting ends 214, and the connecting ends 214 are symmetrically distributed at both ends of the magnetic flux shielding structure 210. In the iron core group 10, one of two adjacent permanent magnets 300 is disposed opposite to one connecting end 214 of the magnetic flux shielding structure 210, and the other of the two adjacent permanent magnets 300 is disposed opposite to the other connecting end 214 of the magnetic flux shielding structure 210.

[0232] The distance between the radially outer surface of the permanent magnet 300 and the radially outer surface of the magnetic flux portion 220 is greater than the distance between the radially outer surface of the permanent magnet 300 and the radially outer surface of the connecting end portion 214.

[0233] The radially outer surface of the connecting end portion 214 is arranged non-parallel to the radially outer surface of the permanent magnet 300, and the radially outer surface of the connecting end portion 214 shows a tendency of being thinner in the middle and thicker at both ends.

[0234] The first iron core group 10a, the second iron core group 10b, and the third iron core group 10c are arranged in a segmented staggered pole structure. The so-called segmented staggered pole structure means that the permanent magnets 300 of the same polarity are sequentially staggered by a certain angular space along the circumferential direction inside each iron core group 10.

[0235] The shape of the permanent magnet 300 is a "one" - shaped structure. Or, the permanent magnet 300 includes a plurality of first permanent magnet segments 310, and the plurality of first permanent magnet segments 310 are arranged in a "one" - shaped layout.

[0236] The shape of the permanent magnet 300 is a "V" - shaped structure. Or, the permanent magnet 300 includes two second permanent magnet segments 320, and the two second permanent magnet segments 320 are configured into a "V" - shaped structure.

[0237] The q - axis is the center line between two adjacent opposite - polarity magnetic poles along the circumferential direction. The d - axis is the center line of a single magnetic pole.

[0238] The magnetic flux shielding structure 210 is magnetized to more than 70% of the saturation magnetization of the raw material constituting the iron core body 110.

[0239] The outer peripheral wall of the magnetic flux portion 220 is a first arc - shaped wall protruding in a direction away from the shaft hole 400, the outer peripheral wall of the main body portion 212 is a second arc - shaped wall protruding in a direction away from the shaft hole 400, and the outer peripheral wall of the connecting end portion 214 is a third arc - shaped wall recessed in a direction toward the shaft hole 400; the center of the circle corresponding to the first arc - shaped wall is located on one side of the center of the shaft hole 400, the center of the circle corresponding to the second arc - shaped wall coincides with the center of the shaft hole 400, and the center of the circle corresponding to the third arc - shaped wall is located outside the iron core body 110.

[0240] The rotating electrical machine further has an armature disposed radially outside the rotor 1.

[0241] The radially outer surface of the magnetic flux portion 220 protrudes radially outward more than the radially outer surface of the magnetic flux shielding structure 210.

[0242] The rotating electrical machine has a rotor 1 that rotates about the central axis.

[0243] A plurality of magnetic flux shielding structures 210 are magnetically saturated between the magnetic poles of the circumferentially adjacent permanent magnets 300, and the degree of saturation is more than 70%.

[0244] The rotating electrical machine is an electrical machine with an inner rotor 1.

[0245] A permanent magnet 300 is inserted into each magnet slot 130 to form a magnetic pole. The magnetic poles in two adjacent magnet slots 130 in the circumferential direction are of opposite polarities.

[0246] In addition to the magnetic holes for installing the permanent magnet 300, the magnet slot 130 also has non-magnetic holes, which are located on both circumferential sides of the magnetic holes. Therefore, the non-magnetic holes suppress the leakage of magnetic flux from both circumferential ends of the permanent magnet 300.

[0247] The magnetic flux portion 220 is located radially outside the permanent magnet 300. The magnetic flux portion 220 is a magnetic path between the permanent magnet 300 located radially inside it and the outer peripheral wall of the iron core body 110. The plurality of magnetic flux portions 220 include an N-pole magnetic flux portion and an S-pole magnetic flux portion. The outer peripheral wall, i.e., the radially outer surface of the N-pole magnetic flux portion, is an N-pole. The radially outer surface of the S-pole magnetic flux portion is an S-pole. The permanent magnet 300 with an N-pole on its radially outer surface is configured with an N-pole magnetic flux portion. The permanent magnet 300 with an S-pole on its radially outer surface is configured with an S-pole magnetic flux portion. Therefore, the plurality of N-pole magnetic flux portions and the plurality of S-pole magnetic flux portions are alternately arranged in the circumferential direction of the rotor 1. That is, the plurality of N-pole magnetic flux portions and the plurality of S-pole magnetic flux portions are arranged with a magnetic flux shielding structure 210 therebetween, and the radially outer magnetic poles of two adjacent magnetic flux portions 220 are different from each other in the circumferential direction of the rotor 1.

[0248] By reasonably setting the structure of the rotor 1 in this application, not only can the torque ripple be effectively reduced, but also the utilization rate of the magnetic flux portion 220 can be improved, which is beneficial to improving the performance such as the output torque of the electrical machine.

[0249] As Figure 9 shown, the solid line represents the data curve graph of an electrical machine with only three-stage skewing, and the dashed line represents the data curve graph of the electrical machine of this application. Among them, avg represents the average value of the output torque, and pkavg represents the torque ripple. By comparison, it can be seen that this application can effectively reduce the torque ripple of the electrical machine using the rotor 1 and can improve the output torque of the electrical machine.

[0250] In this application, the term "plurality" means two or more, unless otherwise clearly defined. Terms such as "install", "connect", "join", "fix", etc. should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" 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 the specific circumstances.

[0251] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The above is only the preferred embodiment of this application and is not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A rotor, characterized in that, it includes: a plurality of iron core groups which are stacked, each of the iron core groups includes an iron core and a plurality of permanent magnets, and each of the iron cores includes: an iron core body; a mounting hole provided in the iron core body, and the mounting holes of the plurality of iron core groups penetrate along the axial direction of the rotor to form a shaft hole; a plurality of magnet grooves provided in the iron core body, and the plurality of magnet grooves are arranged at intervals around the shaft hole, and one of the permanent magnets is arranged in each of the magnet grooves; the part of the iron core body between the magnet groove and the outer peripheral wall of the iron core body includes a plurality of magnetic flux groups, and the plurality of magnetic flux groups are arranged around the shaft hole, and each of the magnetic flux groups includes a magnetic flux shielding structure and a magnetic flux part in the circumferential direction of the rotor, each of the magnetic flux parts is arranged opposite to one of the permanent magnets, and each of the magnetic flux shielding structures includes a main body part and two connecting end parts, and along the circumferential direction of the rotor, the main body part is connected between the two connecting end parts; any two adjacent permanent magnets arranged opposite to each other in the two adjacent iron core groups are staggered in the circumferential direction of the rotor; in the iron core group, one of the two adjacent permanent magnets is arranged opposite to one of the connecting end parts of the magnetic flux shielding structure, and the other of the two adjacent permanent magnets is arranged opposite to the other connecting end part of the magnetic flux shielding structure; along the circumferential direction of the rotor, the part of the connecting end part opposite to the permanent magnet includes a first end segment and a second end segment; wherein, the distance from the outer peripheral wall of the first end segment to the permanent magnet is less than the distance from the outer peripheral wall of the second end segment to the permanent magnet.

2. The rotor according to claim 1, characterized in that, along the circumferential direction of the rotor, the part of the connecting end part opposite to the permanent magnet further includes a third end segment, and the first end segment is connected between the second end segment and the third end segment; wherein, the distance from the outer peripheral wall of the first end segment to the permanent magnet is less than the distance from the outer peripheral wall of the third end segment to the permanent magnet.

3. The rotor according to claim 2, characterized in that, the connection between the outer peripheral wall of the first end segment and the outer peripheral wall of the second end segment is smoothly transitioned; and / or the connection between the outer peripheral wall of the first end segment and the outer peripheral wall of the third end segment is smoothly transitioned.

4. The rotor according to any one of claims 1 to 3, characterized in that, the distance from the outer peripheral wall of the magnetic flux part to the permanent magnet is greater than the distance from the outer peripheral wall of the connecting end part to the permanent magnet.

5. The rotor according to claim 4, characterized in that, the outer peripheral wall of the magnetic flux part is a first arc-shaped wall protruding away from the shaft hole, the outer peripheral wall of the main body part is a second arc-shaped wall protruding away from the shaft hole, and the outer peripheral wall of the connecting end part is a third arc-shaped wall recessed towards the shaft hole; the center corresponding to the first arc-shaped wall is located on one side of the center of the shaft hole, and the center corresponding to the second arc-shaped wall coincides with the center of the shaft hole.

6. The rotor according to any one of claims 1 to 3, characterized in that, The magnetic flux portion is symmetrically arranged along the center line of the pole where it is located; The magnetic flux shielding structure is symmetrically arranged along the center line between the poles.

7. The rotor according to claim 6, wherein, The two connection ends of each of the magnetic flux shielding structures are symmetrically arranged along the center line between the poles.

8. The rotor according to any one of claims 1 to 3, wherein, The number of the iron core groups is greater than or equal to three; Among three adjacent iron core groups, three relatively arranged magnetic flux groups are respectively denoted as a first magnetic flux group, a second magnetic flux group and a third magnetic flux group, and the second magnetic flux group is located between the first magnetic flux group and the third magnetic flux group; A part of the magnetic flux shielding structure of the second magnetic flux group overlaps with the magnetic flux shielding structure of the first magnetic flux group, and a part of the magnetic flux portion of the second magnetic flux group overlaps with the magnetic flux shielding structure of the first magnetic flux group; A part of the magnetic flux shielding structure of the third magnetic flux group overlaps with the magnetic flux shielding structure of the second magnetic flux group, and a part of the magnetic flux portion of the third magnetic flux group overlaps with the magnetic flux shielding structure of the second magnetic flux group.

9. The rotor according to any one of claims 1 to 3, wherein, The permanent magnet is a bar-shaped permanent magnet.

10. The rotor according to claim 9, wherein, The permanent magnet includes a plurality of first permanent magnet segments, and the plurality of first permanent magnet segments are arranged in a bar shape.

11. The rotor according to any one of claims 1 to 3, wherein, The permanent magnet includes two second permanent magnet segments, each of the second permanent magnet segments includes a first permanent magnet end and a second permanent magnet end, the first permanent magnet end is located between the shaft hole and the second permanent magnet end, the first permanent magnet ends of the two second permanent magnet segments are adjacent to each other, and the second permanent magnet ends of the two second permanent magnet segments are away from each other.

12. The rotor according to claim 11, wherein, The second permanent magnet segment includes a plurality of sub-segments, and the plurality of sub-segments are arranged in a bar shape.

13. The rotor according to any one of claims 1 to 3, wherein, In the iron core group, the polarities of the end faces of two adjacent permanent magnets facing away from the shaft hole are different.

14. An electric machine, wherein, comprising: The rotor according to any one of claims 1 to 13.

15. An electric power steering system, wherein, comprising: The rotor according to any one of claims 1 to 13; or The electric machine according to claim 14.

16. A vehicle, wherein, comprising: The rotor according to any one of claims 1 to 13; or The electric machine according to claim 14; or The electric power steering system according to claim 15.

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