Rotor structure, motor and vehicle

Abstract

The utility model relates to a rotor structure, a motor and a vehicle. The rotor structure comprises a rotor core and a rotating shaft. The rotor iron core comprises a center hole penetrating through the end faces of the two ends of the rotor iron core in the axial direction. The circumferential side wall of the center hole comprises a first arc-shaped section and a first linear section. The rotating shaft is inserted into the center hole, the outer side wall of the rotating shaft comprises a second arc-shaped section and a second linear section, and the second arc-shaped section is matched with the first arc-shaped section and used for installing and positioning the rotating shaft and the rotor core; and the second linear section is matched with the first linear section and is used for limiting circumferential rotation of the rotating shaft and the rotor core. The rotor structure is applied to a high-speed driving motor, and through the structural design of the arc-shaped sections and the linear sections, the problem of motor vibration caused by clearance fit between the rotor iron core and the rotating shaft at a high rotating speed can be effectively improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motors, and in particular, to a rotor structure, a motor and a vehicle. Background Art

[0002] As the core part of new energy vehicles, the drive motor has higher and higher requirements with the development of new energy vehicles. Increasing the motor speed is an effective way to increase the power density of the drive motor, but as the motor speed increases, the vibration between the motor shaft and the rotor core increases, which cannot meet the needs of high-speed motors. Utility Model Content

[0003] The purpose of the present disclosure is to provide a rotor structure, a motor and a vehicle. The rotor structure is applied to a high-speed drive motor. Through the structural design of arc segments and straight segments, the motor vibration problem caused by the clearance between the rotor core and the shaft at high speed can be effectively improved.

[0004] In order to achieve the above objective, according to a first aspect of the present disclosure, a rotor structure is provided, comprising:

[0005] The rotor core comprises a central hole axially penetrating through the end surfaces at both ends thereof, wherein the circumferential side wall of the central hole comprises a first arc segment and a first straight segment; and

[0006] A rotating shaft is inserted into the center hole, and the outer side wall of the rotating shaft includes a second arc segment and a second straight segment. The second arc segment cooperates with the first arc segment to be used for installation and positioning of the rotating shaft and the rotor core; the second straight segment cooperates with the first straight segment to limit the circumferential rotation of the rotating shaft and the rotor core.

[0007] Optionally, the first arc segment and the first straight segment extend along the axial direction of the center hole to two opposite end surfaces of the rotor core.

[0008] Optionally, there are multiple first arc segments and multiple first straight line segments, and the multiple first arc segments and the first straight line segments are arranged alternately along the circumference of the central hole;

[0009] There are a plurality of the second arc segments and the second straight line segments, and the plurality of the second arc segments and the second straight line segments are arranged alternately along the circumference of the rotating shaft;

[0010] The first arc segment and the second arc segment correspond one to one, and the first straight line segment and the second straight line segment correspond one to one.

[0011] Optionally, the number of the first arc segments and the second arc segments is the same and equal to the number of pole pairs of the drive motor.

[0012] Optionally, the number of the first arc segments and the number of the first straight segments are both three, which are staggered along the circumferential direction and sequentially connected to form the central hole;

[0013] There are three second arc segments and three second straight line segments, which are staggered and sequentially connected along the circumference of the rotating shaft.

[0014] Optionally, the rotor structure further includes a locking ring disposed at an end of the rotor core, wherein the locking ring is fixedly connected to the rotating shaft and is used to limit the axial position of the rotor core.

[0015] Optionally, the first straight line segment is formed with a protruding structure extending toward the center direction of the center hole, and the protruding structure is interference fit with the second straight line segment.

[0016] Optionally, the first straight line segment forms a first groove body, and the protruding structure is arranged in the first groove body.

[0017] Optionally, the protrusion structure includes a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the axial direction of the central hole on the first straight line segment.

[0018] Optionally, the distance between two adjacent protrusions is greater than the interference between the protrusion and the second straight line segment.

[0019] Optionally, along the circumference of the central hole, each of the first straight line segments is provided with at least one protruding structure.

[0020] Optionally, the rotor core includes a plurality of iron core sheets with through holes stacked in sequence, the inner side wall of the through hole of each iron core sheet includes an arc portion and a straight portion, the arc portions of the plurality of iron core sheets form the first arc segment, and the straight portions of the plurality of iron core sheets form the first straight segment.

[0021] Optionally, along the axial direction of the rotor core, in two adjacent core sheets, the straight portion of at least one core sheet is formed with a protruding spring sheet, and the protruding spring sheet forms the protruding portion.

[0022] Optionally, the core sheet includes a first core sheet and a second core sheet, the straight portion of the second core sheet is formed with a first groove; a second groove corresponding to the first groove is formed on the first core sheet, one end of the protruding spring sheet is connected to the bottom of the second groove, and the other end of the protruding spring sheet extends toward the center direction of the first core sheet and crosses the opening of the second groove;

[0023] The protruding spring piece forms the protruding portion, and a plurality of the protruding spring pieces form the protruding structure;

[0024] The first groove and the second groove form the first groove body.

[0025] According to a second aspect of the present disclosure, a motor is provided, comprising the above-mentioned rotor structure.

[0026] According to a third aspect of the present disclosure, a vehicle is also provided, comprising the above-mentioned motor.

[0027] Through the above technical solution, the rotor structure disclosed in the present invention includes a rotor core with a center hole and a rotating shaft, wherein the center hole includes a first arc segment and a first straight segment, and the rotating shaft includes a second arc segment and a second straight segment, wherein the first arc segment cooperates with the second arc segment to be used for centering and positioning the rotating shaft and the rotor core during installation, and the first straight segment cooperates with the second straight segment to limit the circumferential rotation of the rotating shaft and the rotor core to ensure the transmission torque. The rotor structure disclosed in the present invention is applied to high-speed drive motors, and through the structural design of the arc segment and the straight segment, the centering and torque transmission functions during installation can be realized, and the motor vibration problem caused by the clearance fit between the rotor core and the rotating shaft at high speeds can be effectively improved.

[0028] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0030] Figure 1 is a structural diagram of a rotor structure provided in some embodiments of the present disclosure.

[0031] Figure 2 is an exploded view of a rotor structure provided by some embodiments of the present disclosure.

[0032] Figure 3 is an axial view of a rotor structure provided by some embodiments of the present disclosure, wherein the locking ring is hidden.

[0033] Figure 4 is a cross-sectional view of a rotor structure provided by some embodiments of the present disclosure.

[0034] Figure 5 is based on Figure 4 Enlarged view of part I in .

[0035] Figure 6 It is a structural diagram of the rotor core of the rotor structure provided in some embodiments of the present disclosure.

[0036] Figure 7is an axial view of a rotor core of a rotor structure provided by some embodiments of the present disclosure.

[0037] Figure 8 is a cross-sectional view of a rotor structure provided by some embodiments of the present disclosure.

[0038] Fig. 9 is based on Figure 8 Enlarged view of Part II in .

[0039] Fig.10 It is a structural diagram of the first iron core sheet provided in some embodiments of the present disclosure.

[0040] Fig.11 It is a structural diagram of the second iron core sheet provided in some embodiments of the present disclosure.

[0041] Fig.12 It is a structural diagram of a rotating shaft provided in some embodiments of the present disclosure.

[0042] Fig.13 is an axial view of a rotating shaft provided in some embodiments of the present disclosure.

[0043] Description of Reference Numerals

[0044] 100-rotor core; 101-first core sheet; 1011-arc-shaped portion 1; 1012-straight portion 1; 1013-second groove; 1014-protruding spring piece; 102-second core sheet; 1021-arc-shaped portion 2; 1022-straight portion 2; 1023-first groove; 110-center hole; 111-first arc-shaped segment; 112-first straight segment; 120-protruding structure; 121-protruding portion; 130-first slot body;

[0045] 200 - rotating shaft; 211 - second arc segment; 212 - second straight segment;

[0046] 300-Locking ring. DETAILED DESCRIPTION

[0047] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0048] In the present disclosure, unless otherwise specified, the directional words used, such as "inside" and "outside", refer to the inside and outside of the outline of the corresponding component; "far" and "near" refer to the corresponding structure or the corresponding component being far away from or close to another structure or component. In addition, the terms "first", "second", etc. used in the present disclosure are to distinguish one element from another and do not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure and should not be construed as limitations on the present disclosure.

[0049] As the core part of new energy vehicles, the drive motor has higher and higher requirements with the development of new energy vehicles. Increasing the motor speed is an effective way to increase the power density of the drive motor, but as the motor speed increases, the vibration between the motor shaft and the rotor core increases, which cannot meet the needs of high-speed motors.

[0050] In the relevant technology, the industry's top speed level is about 21000~22000rpm. The existing connection solution between the shaft and the rotor core can only meet 21000rpm~22000rpm, which cannot meet the problem of excessive motor vibration when the speed is further increased. Therefore, how to solve the vibration caused by the motor rotor structure at high speed (>22000rpm) is a technical problem that needs to be solved urgently.

[0051] In view of this, the present disclosure provides a rotor structure, a motor and a vehicle. The rotor structure is applied to a high-speed drive motor. By adopting a structural design of arc segments and straight segments at the junction of the rotor core 100 and the rotating shaft 200, the motor vibration problem caused by the clearance fit between the rotor core 100 and the rotating shaft 200 at high speed can be effectively improved.

[0052] In order to achieve the above purpose, Figures 1 to 13 As shown, an embodiment of the present disclosure provides a rotor structure, which includes a rotor core 100 and a rotating shaft 200. The rotor core 100 includes a center hole 110 that runs through the end faces of both ends thereof in the axial direction, and the circumferential side wall of the center hole 110 includes a first arc segment 111 and a first straight segment 112; the rotating shaft 200 is inserted into the center hole 110, and the outer side wall of the rotating shaft 200 includes a second arc segment 211 and a second straight segment 212, and the second arc segment 211 cooperates with the first arc segment 111 to install and position the rotating shaft 200 and the rotor core 100; the second straight segment 212 cooperates with the first straight segment 112 to limit the circumferential rotation of the rotating shaft 200 and the rotor core 100.

[0053] Through the above technical solution, the rotor structure of the present invention includes a rotor core 100 with a center hole 110 and a rotating shaft 200, wherein the center hole 110 includes a first arc segment 111 and a first straight segment 112, and the rotating shaft 200 includes a second arc segment 211 and a second straight segment 212, wherein the first arc segment 111 cooperates with the second arc segment 211 to center the rotating shaft 200 and the rotor core 100 during installation, and the first straight segment 112 cooperates with the second straight segment 212 to limit the circumferential rotation of the rotating shaft 200 and the rotor core 100 to ensure the transmission torque. The rotor structure of the present invention is applied to high-speed drive motors, and through the structural design of the arc segment and the straight segment, the centering positioning and torque transmission functions during installation can be realized, and the motor vibration problem caused by the clearance fit between the rotor core 100 and the rotating shaft 200 at high speeds can be effectively improved.

[0054] It can be understood that the mating interface between the rotating shaft 200 and the rotor core 100 includes at least a straight segment and an arc segment, wherein the straight segment is used to transmit torque, and the arc segment is used to facilitate the centering positioning of the two. By the cooperation of the second arc segment 211 on the rotating shaft 200 and the first arc segment 111 on the rotor core 100, and the cooperation of the second straight segment 212 on the rotating shaft 200 and the first straight segment 112 on the rotor core 100, the motor vibration problem caused by the clearance fit between the rotor core 100 and the rotating shaft 200 at high speed is improved to meet the needs of high-speed motors.

[0055] It should be noted that if Figure 1 , Figure 2 As shown, the rotor structure also includes a locking ring 300 disposed at the end of the rotor core 100, and the locking ring 300 is fixedly connected to the rotating shaft 200, and is used to limit the axial position of the rotor core 100. Among them, there are two locking rings 300, which are respectively disposed at the two axial end surfaces of the rotor core 100, and are fixedly connected to the rotating shaft 200, so as to limit the axial position of the rotor core 100. In the rotor structure, the rotor core 100 is passed through by the rotating shaft 200, and the two ends are respectively matched with the rotating shaft 200 by the locking ring 300 to lock and fix the rotor core 100 in the axial direction. Among them, the locking ring 300 and the rotating shaft 200 can be fixed by a variety of schemes, such as interference fit, threaded locking fit, riveting fit, etc. It is worth noting that in the embodiment of the present disclosure, the locking ring 300 can also have the function of de-weighting and calibrating dynamic balance.

[0056] The first arc segment 111 and the first straight segment 112 may penetrate the two axial end faces of the rotor core 100 in the axial direction, that is, the first arc segment 111 and the first straight segment 112 extend along the axial direction of the center hole 110 to the two opposite end faces of the rotor core 100. In addition, the first arc segment 111 and the first straight segment 112 may also be arranged in a part of the axial direction, and may also play the role of centering and anti-twist. The design mode that the first arc segment 111 and the first straight segment 112 extend along the axial direction of the center hole 110 to the two opposite end faces of the rotor core 100 can increase the contact length between the second straight segment 212 of the rotating shaft 200 and the first straight segment 112 in the center hole 110, and further improve the anti-twist capability.

[0057] There are at least one first arc segment 111 and one first straight segment 112 in the center hole 110 to achieve the centering and anti-twist functions, and the two can be arranged adjacently or at intervals, which is not specifically limited here. In some embodiments, there are multiple first arc segments 111 and first straight segments 112, and the multiple first arc segments 111 and first straight segments 112 are arranged alternately along the circumference of the center hole 110; there are multiple second arc segments 211 and second straight segments 212, and the multiple second arc segments 211 and second straight segments 212 are arranged alternately along the circumference of the rotating shaft 200; the first arc segments 111 and the second arc segments 211 correspond one-to-one, and the first straight segments 112 and the second straight segments 212 correspond one-to-one.

[0058] Among them, the first arc segment 111 and the second arc segment 211 are both multiple and correspond one to one, and can cooperate with each other after the rotating shaft 200 and the rotor core 100 are installed; the first straight segment 112 and the second straight segment 212 are also multiple and correspond one to one, and can also cooperate with each other after the rotating shaft 200 and the rotor core 100 are installed.

[0059] It should be noted that the multiple first arc segments 111 and the multiple first straight segments 112 are arranged alternately in sequence and connected end to end to form the inner wall of the center hole 110; and the multiple second arc segments 211 and the multiple first straight segments 112 can also be arranged alternately in sequence and connected end to end to form the outer wall of the rotating shaft 200 that cooperates with the center hole 110.

[0060] It is understandable that the number of the first arc segments 111 and the second arc segments 211 and the number of the first straight segments 112 and the second straight segments 212 can be designed to be any appropriate number. The number of the first straight segments 112 can be the same as the number of the first arc segments 111 or different.

[0061] Considering that the rotor core 100 is usually formed by stacking a plurality of core sheets in sequence, for the convenience of manufacturing, in some embodiments, the number of the first arc segments 111 and the first arc segments 112 is the same and equal to the number of pole pairs of the drive motor. The number of pole pairs commonly used in the drive motor is 3 or 4, so the first arc segments 111 and the first straight segments 112 of the present disclosure can also be 3 or 4.

[0062] like Figure 3 , Figure 6 , Fig.12 and Fig.13 As shown, in one embodiment, there are three first arc segments 111 and three first straight segments 112, which are staggered and connected in sequence along the circumferential direction to form the center hole 110; there are three second arc segments 211 and three second straight segments 212, which are staggered and connected in sequence along the circumferential direction of the rotating shaft 200. The three first arc segments 111 can be on the same circle with a point on the central axis of the center hole 110 as the center, and similarly, the three second arc segments 211 can be located at the same center with a point on the central axis of the rotating shaft 200 as the center, so as to facilitate the alignment of the rotating shaft 200 and the rotor core 100.

[0063] In order to further improve the coordination between the first straight segment 112 and the second straight segment 212 and ensure the coordination between the rotor core 100 and the rotating shaft 200 at high speed, as shown in FIG. Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, the first straight segment 112 is formed with a protruding structure 120 extending toward the center direction of the center hole 110, and the protruding structure 120 is interference-fitted with the second straight segment 212. When the rotating shaft 200 is inserted into the center hole 110 of the rotor core 100, the protruding structure 120 in the first straight segment 112 can be interference-fitted with the second straight segment 212 of the rotating shaft 200, and in high-speed dynamic rotation, it is ensured that the rotor core 100 always uniformly contacts the surface of the rotating shaft 200 (i.e., the second straight segment 212), thereby ensuring the stable operation of the rotor at high speed.

[0064] It is understandable that the protruding structure 120 can be directly arranged on the first straight line segment 112 , or can be integrally formed with the first straight line segment 112 .

[0065] In some embodiments, the first straight segment 112 forms a first slot body 130, and the protruding structure 120 is disposed on the first slot body 130, that is, one end of the protruding structure 120 is connected to the bottom of the first slot body 130, and the other end extends out of the slot position of the first slot body 130, and can be interference fit with the second straight segment 212 of the rotating shaft 200, thereby achieving a more reliable connection between the rotating shaft 200 and the rotor core 100.

[0066] It should be noted that the protruding structure 120 can be arranged on at least one first straight line segment 112 to improve the interference fit with the second straight line segment 212 on the corresponding rotating shaft 200. Of course, the protruding structure 120 can be a plurality of co-protruding parts, and the plurality of protruding parts 121 are arranged at intervals on the plurality of first straight line segments 112 along the axial direction of the center hole 110. Among them, the plurality of protruding parts 121 can be arranged in plurality along the axial direction of the first straight line segment 112 to form the protruding structure 120. The plurality of first straight line segments 112 can be provided with the protruding structure 120. For example, if there are a plurality of first straight line segments 112, the protruding structure 120 can be arranged on at least part of the first straight line segments 112, or one protruding structure 120 can be arranged on each first straight line segment 112, so as to further improve the stability of the rotor at high speed.

[0067] In some embodiments, each first straight segment 112 is provided with at least one protruding structure 120 along the circumference of the center hole 110. In other words, each first straight segment 112 may be provided with one protruding structure 120, or may be provided with multiple protruding structures 120 spaced apart along the circumference, to ensure the interference fit between the first straight segment 112 and the second straight segment 212, and to improve the stability of the rotor under high-speed rotation. It is understandable that one protruding structure 120 may be provided on a portion of the first straight segment 112, and multiple protruding structures 120 may be provided on another portion of the first straight segment 112.

[0068] like Figure 4 , Figure 5 and Fig. 9 As shown, optionally, the distance D between two adjacent protrusions 121 is greater than the interference S between the protrusion 121 and the second straight segment 212. That is, in the same first straight segment 112, among the multiple protrusions 121 forming the protrusion structure 120, the axial distance D between two adjacent protrusions 121 is greater than the interference S between the protrusion 121 and the second straight segment 212, which can provide sufficient space for the deformation of the protrusion 121 while ensuring the interference fit.

[0069] The rotor core 100 can be constructed in any suitable manner. In some embodiments, the rotor core 100 includes a plurality of iron core sheets with through holes stacked in sequence, and the inner side wall of the through hole of each iron core sheet includes an arc portion and a straight portion. The arc portions of the plurality of iron core sheets form a first arc segment 111, and the straight portions of the plurality of iron core sheets form a first straight segment 112.

[0070] In some embodiments, along the axial direction of the rotor core 100, a straight portion of at least one of the two adjacent core sheets is formed with a protruding spring piece 1014, and the protruding spring piece 1014 forms a protruding portion 121. Fig.10 and Fig.11As shown, the iron core sheet may include a first iron core sheet 101 and a second iron core sheet 102, wherein the first iron core sheet 101 includes an arc portion 1011 and a straight portion 1012; the second iron core sheet 102 includes an arc portion 1021 and a straight portion 1022, and the straight portion 1022 of the second iron core sheet 102 is formed with a first groove 1023; a second groove 1013 corresponding to the first groove 1023 is formed on the straight portion 1012 of the first iron core sheet 101, one end of the protruding spring piece 1014 is connected to the bottom of the second groove 1013, and the other end of the protruding spring piece 1014 extends toward the center direction of the first iron core sheet 101 and crosses the opening of the second groove 1013. The arc portion 1011 and the arc portion 2 1021 form a first arc segment 111; the straight portion 1012 and the straight portion 2 1022 form a first straight segment 112, the protruding spring piece 1014 forms a protruding portion 121, and a plurality of protruding spring pieces 1014 form a protruding structure 120; the first groove 1023 and the second groove 1013 form a first groove body 130.

[0071] For example, the rotor core 100 can be formed by stacking silicon steel sheets one by one, wherein the silicon steel sheets include two types, the two silicon steel sheets have the same appearance, both have through holes, and the inner side walls of the through holes both include straight sections and arc sections, one silicon steel sheet includes a protruding spring sheet 1014, and the protruding spring sheet 1014 is arranged in the second groove 1013 of the straight section; the straight section of the other silicon steel sheet only has a first groove 1023 corresponding to the second groove 1013, therefore, when a plurality of silicon steel sheets of different types are stacked together in an interlaced manner, the through holes of the plurality of silicon steel sheets form the central hole 110 of the rotor core 100, the plurality of straight sections form the first straight section 112, and the plurality of arc sections form the first arc section 111. There is a silicon steel sheet without the protruding spring sheet 1014 between two adjacent silicon steel sheets with the protruding spring sheet 1014, therefore, there is a gap between the two adjacent protruding spring sheets 1014, and the size of the gap is greater than the interference between the protruding spring sheet 1014 and the rotating shaft 200. In addition, both types of silicon steel sheets can be punched (i.e., their structural features are formed by stamping process).

[0072] Among them, the spring piece of the protruding spring piece 1014 protrudes to interfere with the second straight section 212 of the rotating shaft 200, and the interference amount can be reasonably selected according to the design to ensure that under high-speed operation, the rotor core 100 always contacts the surface of the rotating shaft 200 evenly, ensuring smooth operation of the rotor under high speed.

[0073] Two different silicon steel sheets are interlaced and stacked, and are arranged in sequence along the axial direction. The axially corresponding protruding spring pieces 1014 are grouped together, and the number of groups is consistent with the first straight line segment 112, or each first straight line segment 112 is distributed with at least one group of protruding spring pieces 1014, and more groups can also be arranged.

[0074] Currently, the rotor core 100 of mainstream drive motors all have segmented skew requirements, so the center hole 110 features of the rotor core 100 of different segments can be rotated by a certain angle to arrange straight segments and arc segments, and then assembled into a rotor structure to form a skew angle.

[0075] It should be noted that this solution is also applicable to the currently popular oil-cooled rotor. That is, the rotating shaft 200 can also adopt a hollow shaft, and radial oil holes are set in the straight section to connect the first slot body 130, so that the first slot body 130 and the second straight section 212 form a cooling oil channel, and the radial oil holes are connected to the cavity of the hollow shaft and the cooling oil channel to complete the oil cooling of the rotor structure.

[0076] An embodiment of the present disclosure provides a motor, which includes a stator structure and the above-mentioned rotor structure. Since the rotor structure adopts the structure of the above-mentioned embodiment, the motor also has all the advantages of the above-mentioned rotor structure.

[0077] An embodiment of the present disclosure further provides a vehicle, which includes the above-mentioned motor, so the vehicle also has the advantages of the above-mentioned motor, which will not be repeated here.

[0078] The rotor structure, motor and vehicle disclosed in the present invention include a rotor core 100 with a center hole 110 and a rotating shaft 200, wherein the center hole 110 includes a first arc segment 111 and a first straight segment 112, and the rotating shaft 200 includes a second arc segment 211 and a second straight segment 212, wherein the first arc segment 111 cooperates with the second arc segment 211 to center the rotating shaft 200 and the rotor core 100 during installation, and the first straight segment 112 cooperates with the second straight segment 212 to limit the circumferential rotation of the rotating shaft 200 and the rotor core 100 to ensure the transmission torque. The rotor structure disclosed in the present invention is applied to high-speed drive motors, and through the structural design of the arc segment and the straight segment, the centering positioning and torque transmission functions during installation can be realized, and the motor vibration problem caused by the clearance fit between the rotor core 100 and the rotating shaft 200 at high speeds can be effectively improved.

[0079] Furthermore, by arranging the protruding structure 120 (protruding spring piece 1014) between the rotor core 100 and the rotating shaft 200, the stability of the rotor structure at high speed is ensured, thereby achieving smooth operation of the rotor structure at high speed, with a simple structure and easy production and promotion.

[0080] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0081] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0082] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A rotor structure, characterized in that: include: The rotor core comprises a central hole axially penetrating through the end surfaces at both ends thereof, wherein the circumferential side wall of the central hole comprises a first arc segment and a first straight segment; and A rotating shaft is inserted into the center hole, and the outer side wall of the rotating shaft includes a second arc segment and a second straight segment. The second arc segment cooperates with the first arc segment to be used for installation and positioning of the rotating shaft and the rotor core; the second straight segment cooperates with the first straight segment to limit the circumferential rotation of the rotating shaft and the rotor core.

2. The rotor structure according to claim 1, characterized in that: The first arc segment and the first straight segment extend along the axial direction of the central hole to two opposite end surfaces of the rotor core.

3. The rotor structure according to claim 1, characterized in that: There are a plurality of the first arc segments and the first straight line segments, and the plurality of the first arc segments and the first straight line segments are arranged alternately along the circumference of the central hole; There are a plurality of the second arc segments and the second straight line segments, and the plurality of the second arc segments and the second straight line segments are arranged alternately along the circumference of the rotating shaft; The first arc segment and the second arc segment correspond one to one, and the first straight line segment and the second straight line segment correspond one to one.

4. The rotor structure according to claim 3, characterized in that: The number of the first arc segments is the same as the number of the second arc segments, and is equal to the number of pole pairs of the drive motor.

5. The rotor structure according to claim 3, characterized in that: There are three first arc segments and three first straight segments, which are staggered along the circumferential direction and connected in sequence to form the central hole; There are three second arc segments and three second straight line segments, which are staggered and sequentially connected along the circumference of the rotating shaft.

6. The rotor structure according to claim 1, characterized in that: The rotor structure also includes a locking ring disposed at the end of the rotor core. The locking ring is fixedly connected to the rotating shaft and is used to limit the axial position of the rotor core.

7. The rotor structure according to any one of claims 1 to 6, characterized in that: The first straight line segment is formed with a protruding structure extending toward the center direction of the center hole, and the protruding structure is interference-fitted with the second straight line segment.

8. The rotor structure according to claim 7, characterized in that: The first straight line segment forms a first groove body, and the protruding structure is arranged in the first groove body.

9. The rotor structure according to claim 8, characterized in that: The protrusion structure includes a plurality of protrusions, and the plurality of protrusions are arranged at intervals on the first straight line segment along the axial direction of the central hole.

10. The rotor structure according to claim 9, characterized in that: The distance between two adjacent protrusions is greater than the interference between the protrusion and the second straight line segment.

11. The rotor structure according to claim 7, characterized in that: Along the circumference of the central hole, each of the first straight line segments is provided with at least one protruding structure.

12. The rotor structure according to claim 9, characterized in that: The rotor core includes a plurality of core sheets with through holes stacked in sequence, the inner side wall of the through hole of each core sheet includes an arc portion and a straight portion, the arc portions of the plurality of core sheets form the first arc segment, and the straight portions of the plurality of core sheets form the first straight segment.

13. The rotor structure according to claim 12, characterized in that: Along the axial direction of the rotor core, in two adjacent core sheets, a protruding spring piece is formed on the straight portion of at least one core sheet, and the protruding spring piece forms the protruding portion.

14. The rotor structure according to claim 13, characterized in that: The core sheet includes a first core sheet and a second core sheet, the straight portion of the second core sheet is formed with a first groove; the first core sheet is formed with a second groove corresponding to the first groove, one end of the protruding spring sheet is connected to the groove bottom of the second groove, and the other end of the protruding spring sheet extends toward the center direction of the first core sheet and crosses the opening of the second groove; The protruding spring piece forms the protruding portion, and a plurality of the protruding spring pieces form the protruding structure; The first groove and the second groove form the first groove body.

15. A motor, characterized in that: The motor comprises the rotor structure according to any one of claims 1-14.

16. A vehicle, characterized in that: The vehicle comprises the electric machine of claim 15 .

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