Rotor structure, motor and vehicle

Abstract

This disclosure relates to a rotor structure, a motor, and a vehicle. The rotor structure includes a shaft and a rotor core. The rotor core has a through hole extending along its own axial direction. The shaft passes through the through hole. One of the outer wall of the shaft and the wall of the through hole in the rotor core has a protruding structure, and the other of the outer wall of the shaft and the wall of the through hole in the rotor core has a recessed structure. The protruding structure can deform when the shaft passes through the through hole to fit into and abut against the recessed structure. When the motor operates at high speed, the combined action of multiple recessed structures and multiple protruding structures allows the protruding structure to abut against the recessed structure, ensuring that the protruding structure maintains close contact with the recessed structure at all times. This effectively limits the relative movement between the rotor core and the shaft. For example, when the motor rotor rotates at high speed and generates centrifugal force and torque, this avoids motor vibration problems caused by relative movement.

Description

Technical Field

[0001] This disclosure relates to the field of electric motor technology, and more specifically, to a rotor structure, an electric motor, and a vehicle. Background Technology

[0002] Electric motors, as indispensable power equipment in modern industry, are widely used in various fields. During motor operation, rotational speed is a key performance indicator; high-speed motors can provide greater power density and higher efficiency. However, when a motor operates at high speeds, relative movement occurs between the rotor core and the shaft, leading to motor vibration and severely affecting its performance and lifespan. Utility Model Content

[0003] To overcome the problems existing in the related technologies, this disclosure provides a rotor structure, an electric motor, and a vehicle.

[0004] According to a first aspect of the present disclosure, a rotor structure is provided, including a rotating shaft and a rotor core, wherein the rotor core has a through hole extending along its own axial direction, and the rotating shaft passes through the through hole;

[0005] One of the outer wall of the rotating shaft and the hole wall of the through hole of the rotor core has a protruding structure, and one of the outer wall of the rotating shaft and the hole wall of the through hole of the rotor core has a recessed structure.

[0006] The protruding structure can deform when the rotating shaft passes through the through hole, so as to be embedded and abut against the recessed structure.

[0007] In some possible implementations, there are multiple protrusion structures, and the multiple protrusion structures are equally spaced around the circumference of the rotating shaft or the circumference of the rotor core.

[0008] The recessed structure is multiple, and the multiple recessed structures are equally spaced around the circumference of the rotating shaft or the circumference of the rotor core.

[0009] Each of the protruding structures can be embedded in and abut against each of the corresponding recessed structures when the rotating shaft passes through the through hole.

[0010] When the motor is running, the rotor core needs to transmit torque to the shaft to drive it to rotate. The evenly distributed protrusions and recesses help to balance the centrifugal force of the rotor core in the circumferential direction, so that the torque can be evenly transmitted from the rotor core to the shaft in the circumferential direction. This reduces the unbalanced centrifugal force caused by uneven mass distribution, thereby reducing the additional vibration and impact caused by uneven torque, and further improving the stability of motor operation.

[0011] In some possible implementations, one of the outer wall of the rotating shaft and the hole wall of the through hole of the rotor core is formed with a plurality of recessed structure groups, each recessed structure group including two recessed structures, and the two recessed structures in each recessed structure group are symmetrically arranged about the central axis of the through hole or the central axis of the rotating shaft.

[0012] One of the outer wall of the rotating shaft and the hole wall of the through hole of the rotor core is formed with a plurality of protrusion structure groups. Each protrusion structure group includes two protrusion structures, and the two protrusion structures in each protrusion structure group are symmetrically arranged about the central axis of the through hole or the central axis of the rotating shaft.

[0013] When the motor is running, the rotor core needs to transmit torque to the shaft to drive it to rotate. The equally spaced protrusions and recesses help to balance the centrifugal force of the rotor core in the circumferential direction, so that the torque can be evenly transmitted from the rotor core to the shaft in the circumferential direction. This reduces the unbalanced centrifugal force caused by uneven mass distribution, thereby reducing the additional vibration and impact caused by uneven torque, and further improving the stability of motor operation.

[0014] In some possible implementations, each of the protrusion structures includes a plurality of protrusions spaced apart along the axial direction of the through hole.

[0015] The axially spaced protrusions provide more reliable axial positioning, preventing axial displacement of the rotor core. Furthermore, when the rotor core transmits torque to the shaft, the multiple protrusions embedded in the recessed structure can share the torque, thereby better resisting axial impact and vibration and improving the overall stability of the rotor structure.

[0016] In some possible implementations, the plurality of the protrusions are arranged in a straight line along the axial direction of the through hole. When the shaft rotates and transmits torque to the rotor core through the protrusions, the linearly arranged protrusions can work together in the same axial line, avoiding the problem of torque transmission dispersion or unevenness caused by irregular arrangement of the protrusions.

[0017] In addition, the multiple protrusions arranged in a straight line along the axial direction of the through hole make it easier to assemble the shaft and the rotor core.

[0018] In some possible implementations, the protruding structure is formed as an elastic element, which is in a pre-compressed state when embedded in the recessed structure.

[0019] On the one hand, it can ensure close contact between the elastic element and the recessed structure. On the other hand, when the motor vibrates at high speed, the elastic element can absorb and dissipate vibration energy through its own deformation, thereby improving the overall stability and reliability of the rotor structure.

[0020] In some possible implementations, the protrusion is formed on the wall of a through hole in the rotor core, and the protrusion is integrally formed with the rotor core.

[0021] By integrally molding the raised structure with the rotor core, the rotor core and the raised structure form a complete whole structure, which can withstand greater centrifugal force and torque. Furthermore, the integral molding manufacturing method can make the connection between the raised structure and the rotor core stronger, which can prevent the breakage at the connection between the two under stress.

[0022] In some possible implementations, the number of the recessed structures is an integer multiple of the number of stages of the rotor core;

[0023] The number of the protrusions is an integer multiple of the number of stages in the rotor core.

[0024] The number of recessed and raised structures corresponds to the number of poles of the rotor core, which, in combination with the recessed and raised structures, improves the connection stability between the rotor core and the shaft at the location of the magnetic poles (windings).

[0025] In some possible implementations, the rotor structure further includes a plurality of magnetic poles circumferentially spaced around the rotor core, each magnetic pole having at least one protruding structure or recessed structure corresponding to its position.

[0026] In other words, each magnetic pole has at least one or more corresponding protrusions or recesses. On the one hand, during the high-speed rotation of the rotor structure, the rotor core at the magnetic pole has a greater weight and a greater centrifugal force. By setting at least one protrusion or recess to correspond to the position of the magnetic pole, the connection stability between the rotor core and the shaft at this point can be improved through the combined action of the protrusion and recess.

[0027] In some possible implementations, the rotor core is made of multiple silicon steel sheets stacked together, each of the silicon steel sheets having an opening in the middle, the openings of the multiple silicon steel sheets being interconnected and forming the through hole, and the protrusion structure being connected to the silicon steel sheets.

[0028] The protruding structure is connected to the silicon steel sheet. The side of the protruding structure facing away from the silicon steel sheet is embedded in the corresponding recessed groove, thereby realizing the connection between the silicon steel sheet and the rotating shaft. In the above connection process, no other connection structure is introduced. While simplifying the overall structure, it also avoids interference with the magnetism of the rotor structure caused by the introduction of other connection structures.

[0029] In some possible implementations, each of the protrusion structures includes a plurality of protrusion tabs, each of the protrusion tabs being connected to one of the silicon steel sheets and located at least partially within the opening;

[0030] The recessed structure is a recessed groove, and each of the protruding pieces is embedded in the corresponding recessed groove.

[0031] Each protrusion is connected to a silicon steel sheet in a one-to-one manner and can be embedded in its corresponding recessed groove when the shaft passes through the through hole. This multi-piece interlocking structure increases the contact area and friction between the rotor core and the shaft. When the motor is running, it can transmit torque more effectively, so that the rotor core can drive the shaft to rotate more stably.

[0032] In some possible implementations, the plurality of silicon steel sheets include a plurality of first stacks and a plurality of second stacks, which are stacked along their own thickness direction, with at least one second stack between every two adjacent first stacks, and the protrusions are connected to the first stacks.

[0033] Since silicon steel sheets have a certain degree of elasticity, the protrusions are connected to the first stack of sheets and at least one second stack of sheets is provided between each pair of adjacent first stacks of sheets. In this way, when the silicon steel sheets are assembled into the recessed groove, the gap between the two adjacent first stacks of sheets can provide a certain space for the deformation of the silicon steel sheets, thereby facilitating the assembly of the protrusions connected to the first stack of sheets into the recessed groove.

[0034] In some possible implementations, the height dimension H of the protrusion structure in the depth direction of the recess is greater than the depth dimension D of the recess.

[0035] When the height H of the protruding structure in the depth direction of the recessed groove is greater than the depth D of the recessed groove, the protruding structure will be deformed by the compression of the recessed groove during the process of inserting the shaft into the through hole of the rotor core. This allows the protruding structure to tightly abut against the groove wall. This tight connection can effectively prevent relative movement between the shaft and the rotor core, avoid motor vibration problems caused by relative movement, and improve the stability of motor operation.

[0036] In some possible implementations, the spacing between two adjacent first laminations is L, and the difference between the height dimension H of the protrusion structure in the depth direction of the recess and the depth dimension D of the recess is less than or equal to L.

[0037] On the one hand, the space formed by the gap L between two adjacent first laminations provides space for the part of the protrusion structure that is larger than the recessed groove to deform, and allows the protrusion structure to have enough space to elastically deform when squeezed, avoiding the problem of damage to the protrusion structure or assembly difficulties due to lack of deformation space.

[0038] On the other hand, during motor operation, especially at high speeds, the rotor is subjected to various forces such as centrifugal force, and the protruding structure may further deform. The deformation space provided by the spacing L between adjacent first laminations can accommodate the deformation of the protruding structure during operation, avoiding damage to the protruding structure due to the deformation having nowhere to be released.

[0039] According to a second aspect of the present disclosure, an electric motor is provided, including the rotor structure described above.

[0040] According to a third aspect of the present disclosure, a vehicle is provided, including the rotor structure described above or the motor described above.

[0041] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0042] The outer wall of the shaft and the wall of the through hole in the rotor core are respectively provided with recessed and raised structures. The cooperation between the raised and recessed structures can prevent the rotor core from sliding circumferentially or moving axially relative to the shaft, making the connection between the shaft and the rotor core tighter and more stable. In this way, during motor operation, especially at high speed, the relative movement between the rotor core and the shaft can be effectively restricted. While reducing motor vibration and absorbing and dissipating vibration energy through its own deformation, it can also enable the shaft to transmit torque to the rotor core more effectively, thereby further improving the efficiency of the motor.

[0043] Furthermore, since the protruding structure can deform when installed in the through hole, the elastic restoring force generated after the deformation of the protruding structure during the rotation of the rotor structure can make the protruding structure abut against the inner wall of the groove structure, thereby ensuring that the protruding structure and the groove structure always maintain a close contact state, further improving the connection stability of the two.

[0044] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0045] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0046] Figure 1 This is an exploded view of a rotor structure provided in an exemplary embodiment of this disclosure;

[0047] Figure 2 This is a top view of a rotor structure provided in an exemplary embodiment of this disclosure;

[0048] Figure 3 This is a partially enlarged view of the rotor core of a rotor structure provided in an exemplary embodiment of this disclosure;

[0049] Figure 4 This is a partially enlarged view of the shaft of a rotor structure provided in an exemplary embodiment of this disclosure;

[0050] Figure 5 This is a top view of the first lamination of a rotor structure provided in an exemplary embodiment of this disclosure;

[0051] Figure 6 This is a top view of the second lamination of a rotor structure provided in an exemplary embodiment of this disclosure.

[0052] Explanation of reference numerals in the attached figures

[0053] 1-Rotor structure; 10-Shaft; 12-Recessed structure; 120-Recessed groove; 20-Rotor core; 21-Through hole; 22-Protruding structure; 220-Protruding piece; 23-Silicon steel sheet; 230-Opening; 231-First lamination; 232-Second lamination; 30-Locking ring. Detailed Implementation

[0054] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0055] In this disclosure, unless otherwise stated, directional terms are used only for the convenience of describing the disclosure and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or a specific orientation construction and operation, and therefore should not be construed as a limitation of the disclosure. "Inner" and "outer" refer to the inner and outer contours of the corresponding components. In addition, the terms "first," "second," etc., are used to distinguish one element from another and do not have any sequential or importance.

[0056] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connect," "link," and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0057] Research has shown that in related technologies, when the motor rotates at high speed (>22000rpm), it has a large centrifugal force, which will cause relative movement between the shaft and the rotor core, resulting in motor vibration.

[0058] In view of this, such as Figures 1 to 6 As shown, according to a first aspect of the present disclosure, a rotor structure 1 is provided, including a rotating shaft 10 and a rotor core 20. The rotor core 20 has a through hole 21 extending along its own axial direction. The rotating shaft 10 passes through the through hole 21. One of the outer wall of the rotating shaft 10 and the hole wall of the through hole 21 of the rotor core 20 is formed with a protruding structure 22. The other of the outer wall of the rotating shaft 10 and the hole wall of the through hole 21 of the rotor core 20 is formed with a recessed structure 12. The protruding structure 22 can deform when the rotating shaft 10 passes through the through hole 21 so as to be embedded and abut against the recessed structure 12.

[0059] A recessed structure 12 and a raised structure 22 are respectively provided on the outer wall of the rotating shaft 10 and the hole wall of the through hole 21 of the rotor core 20. The cooperation between the raised structure 22 and the recessed structure 12 can prevent the rotor core 20 from sliding circumferentially or moving axially relative to the rotating shaft 10, making the connection between the rotating shaft 10 and the rotor core 20 tighter and more stable. In this way, during the operation of the motor, especially at high speed, the relative movement between the rotor core 20 and the rotating shaft 10 can be effectively restricted. While reducing motor vibration and absorbing and dissipating vibration energy through its own deformation, it can also enable the rotating shaft 10 to transmit torque to the rotor core 20 more effectively, thereby further improving the efficiency of the motor.

[0060] Furthermore, since the protruding structure 22 can deform when installed in the through hole 21, the elastic restoring force generated after the deformation of the protruding structure 22 during the rotation of the rotor structure 1 can make the protruding structure 22 abut against the inner wall of the groove structure, thereby enabling the protruding structure 22 to always maintain a close contact with the recessed structure 12, further improving the connection stability between the two.

[0061] It should be noted that the outer wall of the shaft 10 and the hole wall of the through hole 21 of the rotor core 20 mentioned above are provided with a protruding structure 22, and the outer wall of the shaft 10 and the hole wall of the through hole 21 of the rotor core 20 are provided with a recessed structure 12. This can be understood as the recessed structure 12 and the protruding structure 22 being formed on the hole wall of the through hole 21 or on the outer wall of the shaft 10, or both the recessed structure 12 and the protruding structure 22 being formed on the hole wall of the through hole 21 and the outer wall of the shaft 10.

[0062] To further improve the stability of rotor structure 1, in the embodiments provided in this disclosure, such as Figure 2 , Figure 5 As shown, there are multiple protruding structures 22, which are evenly spaced around the circumference of the rotating shaft 10 or the rotor core 20. Similarly, there are multiple recessed structures 12, also evenly spaced around the circumference of the rotating shaft 10 or the rotor core 20. Each protruding structure 22 can be embedded in and abut against its corresponding recessed structure 12 when the rotating shaft 10 passes through the through hole 21. The multiple recessed structures 12 and the multiple protruding structures 22 are evenly spaced. When the motor is running, the rotor core 20 needs to transmit torque to the rotating shaft 10 to drive its rotation. The evenly spaced protruding structures 22 and recessed structures 12 help balance the centrifugal force of the rotor core 20 in the circumferential direction, enabling the torque to be evenly transmitted from the rotor core 20 to the rotating shaft 10 in the circumferential direction. This reduces the unbalanced centrifugal force caused by uneven mass distribution, thereby reducing additional vibration and impact caused by uneven torque, and further improving the stability of motor operation.

[0063] In some possible implementations, such as Figure 2 As shown, one of the outer wall of the rotating shaft 10 and the hole wall of the through hole 21 of the rotor core 20 can be formed with multiple recessed structure groups. Each recessed structure group includes two recessed structures 12. The two recessed structures 12 in each recessed structure group are symmetrically arranged about the central axis of the through hole 21 or the central axis of the rotating shaft 10. One of the outer wall of the rotating shaft 10 and the hole wall of the through hole 21 of the rotor core 20 can be formed with multiple protruding structure groups. Each protruding structure group includes two protruding structures 22. The two protruding structures 22 in each protruding structure group are symmetrically arranged about the central axis of the through hole 21 or the central axis of the rotating shaft 10. The two recessed structures 12 and two protruding structures 22 in each recessed structure group and protruding structure group are symmetrically arranged about the central axis. That is, the two protruding structures 22 or the two protruding structures 22 in the same group are completely overlapped after rotating 180° around the central axis. This centrally symmetrical torque transmission method allows them to cooperate with each other when subjected to radial force, and distribute the force evenly on the entire circumference, thereby avoiding the problem of local stress concentration caused by uneven torque transmission.

[0064] It should be noted that when the rotating shaft 10 is installed in the through hole 21 of the rotor core 20, the central axis of the through hole 21 mentioned above is collinear with the central axis of the rotating shaft 10, that is, the central axis of the through hole 21 and the central axis of the rotating shaft 10 are completely coincident.

[0065] In some possible implementations, such as Figure 1 , Figure 2 as well as Figure 5 As shown, each protrusion structure 22 may include multiple protrusions 220, which are spaced apart axially along the through hole 21. The axially spaced protrusions 220 can provide more reliable axial positioning, preventing the rotor core 20 from displacing axially. Furthermore, when the rotor core 20 transmits torque to the shaft 10, the multiple protrusions 220 embedded in the recessed structure 12 can share the torque, thereby better resisting axial impact and vibration and improving the overall stability of the rotor structure 1.

[0066] This disclosure does not limit the specific arrangement of the multiple protrusions 220, for example, such as Figure 1 As shown, in some possible embodiments, multiple protrusions 220 are arranged in a straight line along the axial direction of the through hole 21. When the shaft 10 rotates and transmits torque to the rotor core 20 through the protrusions 220, the linearly arranged protrusions 220 can work together in the same axial line, avoiding the problem of torque transmission dispersion or unevenness caused by irregular arrangement of the protrusions 220.

[0067] In addition, the multiple protrusions 220 arranged in a straight line along the axial direction of the through hole 21 make it easier to assemble the rotating shaft 10 and the rotor core 20.

[0068] To further enhance the vibration reduction effect of rotor structure 1, in one embodiment provided in this disclosure, the protruding structure 22 can be formed as an elastic element, which is in a pre-compressed state when embedded in the recessed structure 12. Since the elastic element is embedded in the recessed structure 12 and is in a pre-compressed state, that is, the elastic element can always apply a certain clamping force to the recessed structure 12. On the one hand, this ensures close contact between the elastic element and the recessed structure 12; on the other hand, when the motor vibrates at high speed, the elastic element can absorb and dissipate vibration energy through its own deformation, thereby improving the overall stability and reliability of rotor structure 1.

[0069] This disclosure does not limit the specific material and structure of the elastic element. For example, the elastic element can be a metal sheet, such as the silicon steel sheet 23 mentioned below, or a spring or other related structure that can generate elastic force when it abuts against the recessed structure 12.

[0070] In some possible implementations, such as Figure 3 As shown, the protrusion structure 22 is formed on the wall of the through hole 21 of the rotor core 20, and the protrusion structure 22 and the rotor core 20 are manufactured as a single piece. Manufacturing the protrusion structure 22 and the rotor core 20 as a single piece allows them to form a complete integral structure, capable of withstanding greater centrifugal force and torque. Furthermore, the integral manufacturing method increases the connection strength between the protrusion structure 22 and the rotor core 20, preventing breakage at the connection point under stress.

[0071] In addition, the one-piece molding manufacturing method reduces additional assembly steps and simplifies the manufacturing process, which can effectively reduce production and processing costs.

[0072] Alternatively, in other embodiments provided in this disclosure, the protrusion structure 22 may be connected to the rotor core 20 by a detachable method such as snap-fit, or the protrusion structure 22 may be connected to the rotor core 20 by a non-detachable method such as riveting or welding. This disclosure does not limit this.

[0073] In the embodiment described below, where the rotor core 20 is composed of multiple silicon steel sheets 23 stacked together, the protrusion structure 22 can be integrally formed with the silicon steel sheets 23.

[0074] The number of poles in the rotor core 20 is closely related to the magnetic field distribution of the motor. In some possible implementations, the number of recessed structures 12 can be an integer multiple of the number of poles in the rotor core 20, and the number of protruding structures 22 can be an integer multiple of the number of poles in the rotor core 20. The number of recessed structures 12 and protruding structures 22 corresponds to the number of poles in the rotor core 20, which, with the cooperation of the recessed structures 12 and protruding structures 22, improves the connection stability between the rotor core 20 where the magnetic poles (windings) are located and the rotating shaft 10.

[0075] Furthermore, when the number of recessed structures 12 and raised structures 22 is an integer multiple of the number of rotor core 20, the magnetic circuit of the motor can be made more symmetrical. During motor operation, the symmetrical magnetic circuit helps to reduce magnetic field distortion and reduce harmonic content. This can make the electromagnetic torque of the motor more stable, reduce torque fluctuation, thereby improving the motor's operating stability and efficiency, reducing the vibration and noise level of the motor during operation, and improving the overall performance of the motor.

[0076] In some possible embodiments, the rotor structure 1 further includes a plurality of magnetic poles (not shown), which are circumferentially spaced around the rotor core 20. Each magnetic pole has at least one protruding structure 22 or recessed structure 12 corresponding to its position. That is, each magnetic pole has at least one or more corresponding protruding structures 22 or recessed structures 12. On the one hand, during the high-speed rotation of the rotor structure 1, the rotor core 20 at the location of the magnetic pole has a greater weight and a greater centrifugal force. By setting at least one protruding structure 22 or recessed structure 12 to correspond to the position of the magnetic pole, the connection stability between the rotor core 20 and the shaft 10 at this location can be improved through the combined action of the protruding structure 22 and the recessed structure 12.

[0077] It should be noted that, in the embodiment where each magnetic pole corresponds to one protrusion 22 or recess 12, the number of recess 12 or protrusion 22 is the same as the number of magnetic poles, and the magnetic pole and the protrusion 22 or recess 12 are located on the straight line of the radius of the through hole 21. In the embodiment where each magnetic pole corresponds to two protrusion 22 or two recess 12, the two protrusion 22 or two recess 12 can be symmetrically arranged on both sides of the magnetic pole.

[0078] In one embodiment provided in this disclosure, such as Figure 5 , Figure 6 As shown, the rotor core 20 can be formed by stacking multiple silicon steel sheets 23. Each silicon steel sheet 23 has an opening 230 in its center. The openings 230 of the multiple silicon steel sheets 23 are interconnected and together form a through hole 21. A protruding structure 22 is connected to the silicon steel sheet 23. The side of the protruding structure 22 facing away from the silicon steel sheet 23 is embedded in the corresponding recess 120, thereby realizing the connection between the silicon steel sheet 23 and the rotating shaft 10. In the above connection process, no other connecting structures are introduced, which simplifies the overall structure and avoids interference with the magnetism of the rotor structure 1 caused by the introduction of other connecting structures.

[0079] It should be noted that the connection between the protruding structure 22 and the silicon steel sheet 23 mentioned above can be that the protruding structure 22 is connected to one of the multiple silicon steel sheets 23, or the protruding structure 22 can be connected to multiple silicon steel sheets 23. This disclosure does not limit this.

[0080] In some possible implementations, such as Figure 5 , Figure 6As shown, each protruding structure 22 may include multiple protruding pieces 220. Each protruding piece 220 is connected to a silicon steel sheet 23 and is at least partially located within the opening 230. The recessed structure 12 is a recessed groove 120, and each protruding piece 220 is embedded in its corresponding recessed groove 120. That is, each protruding piece 220 is connected one-to-one with each silicon steel sheet 23 and can be embedded in its corresponding recessed groove 120 when the rotating shaft 10 passes through the through hole 21. This multi-piece embedded structure increases the contact area and friction between the rotor core 20 and the rotating shaft 10. During motor operation, it can transmit torque more effectively, enabling the rotor core 20 to drive the rotating shaft 10 to rotate more stably.

[0081] It should be noted that, in the embodiment where the protruding structure 22 and the rotor core 20 are integrally formed, the silicon steel sheet 23 can be integrally formed with the protruding sheet 220.

[0082] In the implementation of the related technology where the rotor core 20 has segmented skew requirements, the silicon steel sheets 23 of different segments of the rotor core 20 can be rotated by a certain angle (such as when they are at a skew angle) before the protrusions 220 are arranged, so that all the protrusions 220 are still arranged in a straight line.

[0083] In some possible implementations, such as Figure 5 , Figure 6 As shown, the plurality of silicon steel sheets 23 may include a plurality of first stacked sheets 231 and a plurality of second stacked sheets 232. The plurality of first stacked sheets 231 and the plurality of second stacked sheets 232 are stacked along their own thickness direction. At least one second stacked sheet 232 is provided between every two adjacent first stacked sheets 231. The protruding sheet 220 is connected to the first stacked sheet 231. Since the silicon steel sheet 23 has a certain elasticity, and the protruding sheet 220 is connected to the first stacked sheet 231 and at least one second stacked sheet 232 is provided between every two adjacent first stacked sheets 231, when the silicon steel sheet 23 is assembled into the recessed groove 120, the gap between two adjacent first stacked sheets 231 can provide a certain space for the deformation of the silicon steel sheet 23, thereby facilitating the assembly of the protruding sheet 220 connected to the first stacked sheet 231 into the recessed groove 120.

[0084] In some possible implementations, such as Figure 3 , Figure 4As shown, the height dimension H of the protrusion 22 in the depth direction of the recessed groove 120 is greater than the depth dimension D of the recessed groove 120. When the height dimension H of the protrusion 22 in the depth direction of the recessed groove 120 is greater than the depth dimension D of the recessed groove 120, during the process of inserting the rotating shaft 10 into the through hole 21 of the rotor core 20, the protrusion 22 will be deformed by the compression of the recessed groove 120, so that the protrusion 22 can tightly abut against the groove wall of the recessed groove 120. This tight connection can effectively prevent relative movement between the rotating shaft 10 and the rotor core 20, avoid motor vibration problems caused by relative movement, and improve the stability of motor operation.

[0085] Furthermore, since the protrusions 22 are circumferentially spaced around the shaft 10 or the rotor core 20, the interference fit between the multiple protrusions 22 and the recesses 120 will constrain the shaft 10 and the rotor core 20 at multiple circumferential positions. This multi-directional constraint further enhances the reliability of the connection between the two, so that the shaft 10 and the rotor core 20 can remain relatively fixed in all directions, and better resist the action of various forces generated at high speeds.

[0086] It should be noted that this disclosure does not limit the specific number of second stacked sheets 232 set between two adjacent first stacked sheets 231. For example, only one second stacked sheet 232 may be set between two adjacent first stacked sheets 231, or two, three or more second stacked sheets 232 may be set between two adjacent first stacked sheets 231.

[0087] Since the height H of the protrusion 22 is greater than the depth D of the recess 120, the protrusion 22 will inevitably be compressed and deformed during the process of inserting the rotating shaft 10 into the through hole 21 of the rotor core 20 and embedding the protrusion 22 into the recess 120. Therefore, in one embodiment provided in this disclosure, the distance between two adjacent first laminations 231 is L, and the difference between the height H of the protrusion 22 in the depth direction of the recess 120 and the depth D of the recess 120 is less than or equal to L. On the one hand, the space formed by the distance L between two adjacent first laminations 231 provides space for the portion of the protrusion 22 that is larger than the recess 120 to deform, and allows the protrusion 22 sufficient space for elastic deformation when compressed, avoiding damage to the protrusion 22 or difficulties in assembly due to lack of deformation space.

[0088] On the other hand, during the operation of the motor, especially at high speeds, the rotor is subjected to various forces such as centrifugal force, and the protrusion structure 22 may further deform. The deformation space provided by the spacing L between adjacent first laminations 231 can accommodate the deformation of the protrusion structure 22 during operation, and avoid damage to the protrusion structure 22 due to the deformation having nowhere to be released.

[0089] Furthermore, this disclosure does not limit the connection relationship and connection method between the rotating shaft 10 and the rotor core 20. For example, the rotating shaft 10 and the rotor core 20 can be connected by interference fit, threaded locking fit, riveting fit, etc.

[0090] In one exemplary embodiment provided in this disclosure, such as Figure 1 As shown, the rotor structure 1 may also include a locking ring 30, which is sleeved on the outer periphery of the rotating shaft 10 and used to lock the rotating shaft 10 onto the rotor core 20.

[0091] According to a second aspect of the present disclosure, an electric motor is provided, including the rotor structure 1 as described above. This electric motor possesses all the beneficial effects of the rotor structure 1 described above, which will not be further described in this disclosure.

[0092] Furthermore, it should be noted that the motor provided in this disclosure can be used in any field, and this disclosure does not limit it. For example, in one exemplary embodiment provided in this disclosure, the motor can be used in the fields of pumps, power generation, medical and electronic equipment, aerospace, etc.

[0093] Alternatively, according to a third aspect of the embodiments of this disclosure, a vehicle is provided, including the rotor structure 1 as described above or the motor as described above. The vehicle provided by this disclosure has all the beneficial effects of the rotor structure 1 and the motor described above, which will not be described in detail here.

[0094] Furthermore, this disclosure does not limit the type of vehicle; it can be any vehicle suitable for employing the vehicle thermal management system. For example, the vehicle can be a sedan, truck, van, or other similar vehicle, or a pure electric vehicle, a hybrid electric vehicle (range-extended electric vehicle), etc.

[0095] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0096] 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, this disclosure will not describe the various possible combinations separately.

[0097] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A rotor structure, characterized by, It includes a rotating shaft and a rotor core, wherein the rotor core has a through hole extending along its own axial direction, and the rotating shaft passes through the through hole; One of the outer wall of the rotating shaft and the hole wall of the through hole of the rotor core has a protruding structure, and one of the outer wall of the rotating shaft and the hole wall of the through hole of the rotor core has a recessed structure. The protruding structure can deform when the rotating shaft passes through the through hole, so as to be embedded and abut against the recessed structure.

2. The rotor structure of claim 1, wherein The protruding structure is multiple, and the multiple protruding structures are equally spaced around the circumference of the rotating shaft or the circumference of the rotor core. The recessed structure is multiple, and the multiple recessed structures are equally spaced around the circumference of the rotating shaft or the circumference of the rotor core. Each of the protruding structures can be embedded in and abut against each of the corresponding recessed structures when the rotating shaft passes through the through hole.

3. The rotor structure of claim 1, wherein One of the outer wall of the rotating shaft and the hole wall of the through hole of the rotor core is formed with a plurality of recessed structure groups, each recessed structure group including two recessed structures, and the two recessed structures in each recessed structure group are symmetrically arranged about the central axis of the through hole or the central axis of the rotating shaft. One of the outer wall of the rotating shaft and the hole wall of the through hole of the rotor core is formed with a plurality of protrusion structure groups. Each protrusion structure group includes two protrusion structures, and the two protrusion structures in each protrusion structure group are symmetrically arranged about the central axis of the through hole or the central axis of the rotating shaft.

4. The rotor structure of claim 1, wherein Each of the protrusion structures includes a plurality of protrusions, which are spaced apart along the axial direction of the through hole.

5. The rotor structure of claim 4, wherein The plurality of the protrusions are arranged in a straight line along the axial direction of the through hole.

6. The rotor structure of claim 1, wherein The protruding structure is formed as an elastic element, and the elastic element is in a pre-compression state when it is embedded in the recessed structure.

7. The rotor structure of claim 1, wherein The protruding structure is formed on the wall of the through hole in the rotor core, and the protruding structure and the rotor core are manufactured as a single piece.

8. The rotor structure of any one of claims 1-7, wherein, The number of the recessed structures is an integer multiple of the number of stages of the rotor core; The number of the protrusions is an integer multiple of the number of stages in the rotor core.

9. The rotor structure of claim 8, wherein The rotor structure also includes multiple magnetic poles, which are circumferentially spaced around the rotor core. Each magnetic pole has at least one protruding structure or recessed structure corresponding to its position.

10. The rotor structure of any one of claims 1-7, wherein, The rotor core is made of multiple silicon steel sheets stacked together. Each silicon steel sheet has an opening in the middle. The openings of the multiple silicon steel sheets are interconnected and together form the through hole. The protruding structure is connected to the silicon steel sheets.

11. The rotor structure of claim 10, wherein Each of the protrusion structures includes a plurality of protrusions, each of the protrusions being connected to one of the silicon steel sheets and located at least partially within the opening; The recessed structure is a recessed groove, and each of the protruding pieces is embedded in the corresponding recessed groove.

12. The rotor structure of claim 11, wherein The plurality of silicon steel sheets include a plurality of first stacked sheets and a plurality of second stacked sheets, which are stacked along their own thickness direction. At least one second stacked sheet is provided between every two adjacent first stacked sheets, and the protrusion is connected to the first stacked sheets.

13. The rotor structure of claim 12, wherein A height dimension H of the protruding structure in a depth direction of the recessed groove is greater than a depth dimension D of the recessed groove.

14. The rotor structure of claim 13, wherein A difference between a height dimension H of the protruding structure in a depth direction of the recessed groove and a depth dimension D of the recessed groove is less than or equal to L.

15. An electric machine characterized by A rotor structure comprising any one of claims 1-14.

16. A vehicle characterized by comprising: An electric machine comprising any one of claims 1-14 or the rotor structure of claim 15.

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