Rotor structure, motor and vehicle

Abstract

The invention relates to a rotor structure, a motor and a vehicle, and the rotor structure comprises a rotor iron core which comprises a central hole axially penetrating through the end faces of the two ends of the rotor iron core and a first groove body formed in the side wall of the central hole; 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 and comprises a cavity with an opening in one end; a second cooling channel is defined by the first groove body and the outer side wall of the rotating shaft and communicates with the cavity. The outer side wall of the rotating shaft comprises a second arc-shaped section and a second linear section, a heat dissipation structure composed of a plurality of protruding parts in interference fit with the outer side wall of the rotating shaft is formed in the first groove body, and the protruding parts are arranged at intervals in the extending direction of the first groove body; the distance between every two adjacent protruding parts is larger than the magnitude of interference between the protruding parts and the rotating shaft. Through the arrangement, the problem of motor vibration can be improved while the heat dissipation performance of the rotor structure is improved.

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] As a core component of new energy vehicles, the performance of the drive motor directly affects the overall performance of the vehicle. In related technologies, a cooling medium (such as lubricating oil) is typically introduced into the rotor shaft to cool the rotor assembly and reduce its temperature. However, this cooling capacity is relatively limited and cannot meet the requirements of high-speed rotors.

[0003] Furthermore, in related technologies, the industry's top-level speed is approximately 21,000~22,000 rpm. Existing connection solutions between the shaft 200 and the rotor core 100 can only meet the 21,000~22,000 rpm requirement, failing to address the issue of excessive motor vibration at further speed increases. Therefore, how to solve the vibration caused by the motor rotor structure at high speeds (>22,000 rpm) is a pressing technical problem that needs to be addressed. Summary of the Invention

[0004] The purpose of this disclosure is to provide a rotor structure, a motor, and a vehicle. This rotor structure, by incorporating a second cooling channel, improves heat dissipation, thereby enhancing the motor's power density and continuous performance. Furthermore, the rotor structure disclosed herein can be applied to high-speed drive motors. Through the structural design of curved and straight sections, it enables centering and torque transmission during installation, effectively mitigating motor vibration issues caused by the clearance between the rotor core and the shaft at high speeds.

[0005] To achieve the above objectives, according to a first aspect of this disclosure, a rotor structure is provided, comprising: The rotor core includes a central hole extending axially through its two end faces, and a first slot disposed on the sidewall of the central hole; the circumferential sidewall of the central hole includes a first arc-shaped segment and a first straight segment; and A rotating shaft is inserted into the central hole, including a cavity with one end open; The first groove and the outer wall of the rotating shaft form a second cooling channel. The second cooling channel is connected to the cavity, so that the cooling medium entering the cavity can enter the second cooling channel to cool the rotor core. The outer wall of the rotating shaft includes a second arc-shaped segment and a second straight segment. The second arc-shaped segment cooperates with the first arc-shaped segment for mounting and positioning 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. A heat dissipation structure is formed in the first groove. The heat dissipation structure includes a plurality of protrusions that extend toward the center of the central hole and are interference-fitted with the outer side wall of the rotating shaft. The plurality of protrusions are arranged at intervals along the extension direction of the first groove. The distance between two adjacent protrusions is greater than the interference fit between the protrusion and the shaft.

[0006] Optionally, the rotor core further includes a first cooling channel disposed between the central hole and the outer side wall of the rotor core; The first cooling channel communicates with the cavity, and the first and second cooling channels are connected in parallel, allowing the cooling medium entering the cavity to enter both the first and second cooling channels respectively to cool the rotor core. Thus, by connecting the first and second cooling channels in parallel, different parts of the rotor core can be cooled simultaneously, improving the heat dissipation performance of the rotor structure.

[0007] Optionally, the first cooling channel and / or the first groove extends axially through both end faces of the rotor core. This facilitates the opening at both ends of the first cooling channel to discharge the cooling medium, allowing the cooling medium to cool the central and outer regions of the rotor core. Furthermore, with the first groove extending axially through both end faces, after the stator core and shaft are assembled, the outer walls of the first groove and the shaft form a second cooling channel with openings at both ends. The cooling medium enters from the middle of the second cooling channel and exits from both ends, facilitating the cooling of the internal regions of the rotor core.

[0008] Optionally, the shaft includes a first radial hole that connects the second cooling channel and the cavity. This allows the cooling medium to pass through the first radial hole from the cavity into the second cooling channel to cool the internal region of the rotor core.

[0009] Optionally, a first gap is formed between the heat dissipation structure and the sidewall of the first tank to allow the cooling medium to flow. This first gap ensures the flow of the cooling medium and improves heat exchange efficiency.

[0010] Optionally, the first arc-shaped segment and the first straight segment extend axially along the central hole to the opposite end faces of the rotor core; The first groove is located on the first straight segment, and the first groove and the second straight segment together form the second cooling channel. Thus, by extending the first arc-shaped segment and the first straight segment axially along the central hole to the two opposite end faces of the rotor core, the contact length between the second straight segment of the shaft and the first straight segment within the central hole can be increased, further improving anti-torsion capability. Furthermore, by placing the first groove on the first straight segment, it is easier for the first groove and the second straight segment to form the second cooling channel.

[0011] Optionally, there are multiple first arc-shaped segments and multiple first straight segments, and the multiple first arc-shaped segments and first straight segments are arranged alternately along the circumference of the central hole; There are multiple second arc-shaped segments and multiple second straight segments, which are arranged alternately along the circumference of the axis of rotation; The first arc segment and the second arc segment correspond one-to-one; the first straight line segment and the second straight line segment correspond one-to-one. The first groove is formed on at least a portion of the first straight segment. Thus, multiple first arc segments, multiple first straight segments, multiple second arc segments, and multiple second straight segments are possible. The first arc segments and the second arc segments cooperate, and the first straight segments and the second straight segments cooperate. Through the structural design of the arc segments and straight segments, the centering and torque transmission functions during installation can be achieved.

[0012] Optionally, the number of the first arc-shaped segment and the first straight segment is the same as the number of pole pairs of the drive motor. This makes it easier to manufacture the rotor structure by ensuring that the number of the first arc-shaped segment and the first straight segment are the same as the number of pole pairs of the drive motor.

[0013] Optionally, the rotor core includes a plurality of iron chips stacked sequentially along the axial direction, each of the iron chips having an arc-shaped portion corresponding to the first arc segment and a straight portion corresponding to the first straight segment; Along the axial direction of the rotor core, in two adjacent iron chips, a first groove is formed in the straight segment of one iron chip, and a protruding spring piece is formed in the first groove; a second groove is formed in the straight segment of the other iron chip, corresponding to the first groove. The arcuate portions of the plurality of iron chips form the first arcuate segment, and the straight portions of the plurality of iron chips form the first straight segment; the first groove and the second groove form the first groove body; and the plurality of protruding spring pieces form the heat dissipation structure. Thus, by forming a first groove through a portion of the iron chips in the rotor core and a second groove corresponding to the first groove through another portion of the iron chips, it is convenient to form the first groove body through the first groove and the second groove, and the heat dissipation structure formed by the plurality of protruding spring pieces is disposed in the first groove body to improve heat dissipation capacity.

[0014] Optionally, the rotor structure further includes a first locking ring and a second locking ring disposed at the axial end of the rotor core. The first locking ring and the second locking ring are respectively fixedly connected to the rotating shaft to limit the axial position of the rotor core. Thus, by fixing the first locking ring and the second locking ring to the rotating shaft, the axial direction of the rotor core can be limited.

[0015] Optionally, a second groove is formed on the first locking ring, and the second groove and the axial end face of the rotor core form a third cooling channel; The rotating shaft is provided with a second radial hole, one end of the first cooling channel is connected to the third cooling channel, and the third cooling channel is connected to the cavity through the second radial hole. Thus, the second groove on the first locking ring facilitates the formation of a third cooling channel by the second groove and the axial end face of the rotor core. The second radial hole on the rotating shaft facilitates the connection between the first and third cooling channels, allowing the cooling medium in the cavity to enter the third cooling channel and cool the rotor core.

[0016] Optionally, the first cooling channel may be multiple; The second groove includes an annular groove and a plurality of radial grooves communicating with the annular groove, wherein one end of the radial groove away from the annular groove is connected to the second radial hole; Multiple first cooling channels are connected to the annular groove. Thus, the connection between the multiple first cooling channels and the multiple annular grooves facilitates the entry of cooling medium through the annular grooves into the first cooling channels to cool the rotor core.

[0017] Optionally, one end of the radial groove away from the second radial hole is connected to the middle of the annular groove between two adjacent first cooling channels. This allows the cooling medium entering the annular groove to flow evenly to both sides and distribute to the different first cooling channels, thereby improving cooling capacity.

[0018] Optionally, a first through hole is formed on the second locking ring, corresponding to the end of the first cooling channel away from the first locking ring, for discharging the cooling medium within the first cooling channel. This facilitates the convenient discharge of the cooling medium from the other end of the first cooling channel.

[0019] According to a second aspect of this disclosure, an electric motor is provided, which includes the rotor structure described above.

[0020] According to a third aspect of this disclosure, a vehicle is also provided, which includes the aforementioned motor.

[0021] The rotor structure disclosed herein, comprising a rotor core and a shaft, utilizes the above-described technical solution. A first groove is formed on the sidewall of the central hole. When the shaft is installed within the central hole of the rotor core, the first groove and the sidewall of the shaft form a second cooling channel, which communicates with the cavity, thereby improving the heat dissipation performance of the rotor structure. Furthermore, to further enhance heat dissipation, a heat dissipation structure is arranged within the first groove. This structure is constructed with multiple protrusions, which increase the heat exchange area and improve heat exchange efficiency. Thus, the arrangement of the second cooling channel and the heat dissipation structure enhances the heat dissipation and energy absorption of the motor, meeting the heat dissipation requirements of the motor rotor structure at high speeds. Furthermore, the shaft structure includes a first arc-shaped segment and a first straight segment on the circumferential sidewall of the central hole. The outer sidewall of the shaft includes a second arc-shaped segment that mates with the first arc-shaped segment and a second straight segment that mates with the first straight segment. These segments are constructed as multiple protrusions through a heat dissipation structure. The protrusions are press-fitted with the outer sidewall of the shaft, and the distance between adjacent protrusions is greater than the press-fit between the protrusions and the shaft. Through the structural design of the arc-shaped and straight segments, and the press-fit between the multiple protrusions and the outer sidewall of the shaft, the centering and torque transmission functions between the rotor core and the shaft during installation can be achieved. Thus, the press-fit between the protrusions and the outer sidewall of the shaft, along with the structural design of the arc-shaped and straight segments, can effectively improve the motor vibration problem caused by the clearance fit between the rotor core and the shaft at high speeds.

[0022] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0023] 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 accompanying drawings...

[0024] Figure 1 This is a structural diagram of a rotor structure provided in some embodiments of this disclosure.

[0025] Figure 2 This is an exploded view of a rotor structure provided in some embodiments of this disclosure.

[0026] Figure 3 This is a side view of a rotor structure provided in some embodiments of this disclosure.

[0027] Figure 4 This is an axial view of a rotor structure provided in some embodiments of this disclosure.

[0028] Figure 5 Based on Figure 4 Enlarged view of part I in the image.

[0029] Figure 6 Based on Figure 4 AA section view in the image.

[0030] Figure 7 Based on Figure 6 Enlarged view of Part II.

[0031] Figure 8 This is a schematic diagram of the cooling flow channel of the rotor structure provided in some embodiments of this disclosure.

[0032] Figure 9 This is an axial view of a rotor core provided in some embodiments of this disclosure.

[0033] Figure 10 Based on Figure 9 BB section view in the middle.

[0034] Figure 11 This is a structural diagram of the first iron chip provided in some embodiments of this disclosure.

[0035] Figure 12 This is a structural diagram of the second iron chip provided in some embodiments of this disclosure.

[0036] Figure 13 This is a structural diagram of a rotating shaft provided in some embodiments of this disclosure.

[0037] Figure 14 This is a side view of a rotating shaft provided in some embodiments of this disclosure.

[0038] Figure 15 Based on Figure 14 CC section view in the image.

[0039] Figure 16 Based on Figure 14 EE section view in the image.

[0040] Figure 17 This is an axial sectional view of a rotating shaft provided in some embodiments of this disclosure.

[0041] Figure 18 This is a structural diagram of the first locking ring provided in some embodiments of this disclosure.

[0042] Figure 19 This is a structural diagram of the second locking ring provided in some embodiments of this disclosure.

[0043] Explanation of reference numerals in the attached figures 100 - Rotor core; 110 - Center hole; 111 - First arc-shaped segment; 112 - First straight segment; 120 - Heat dissipation structure; 121 - Protrusion; 130 - First groove; 140 - Axial through hole; 101-First iron chip; 1011-Arc-shaped portion one; 1012-Straight portion one; 1013-Second groove; 1014-Protruding spring piece; 1015-Through hole one; 102-Second iron chip; 1021-Arc-shaped portion two; 1022-Straight portion two; 1023-First groove; 1024-Through hole two; 200 - Rotating shaft; 210 - Cavity; 2101 - Opening; 2102 - First radial hole; 2103 - Second radial hole; 221 - Second arc segment; 222 - Second straight segment; 300 - First locking ring; 310 - Second groove; 311 - Radial groove; 312 - Annular groove; 400 - Second locking ring; 410 - First through hole; G - First gap; Q1 - First cooling channel; Q2 - Second cooling channel; Q3 - Third cooling channel. Detailed Implementation

[0044] 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.

[0045] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" refer to the inner and outer contours of the corresponding components; "far" and "near" refer to the corresponding structure or component being away from or near another structure or component. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. Additionally, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0046] The purpose of this disclosure is to provide a rotor structure, a motor, and a vehicle, wherein the rotor structure, by providing a first cooling channel Q1 and a second cooling channel Q2, can further improve the heat dissipation performance of the rotor structure, which is beneficial to improving the power density and continuous performance of the motor.

[0047] To achieve the above objectives, such as Figures 1 to 19As shown, an embodiment of this disclosure provides a rotor structure, which includes a rotor core 100 and a shaft 200. The rotor core 100 includes a central hole 110 extending axially through its two end faces, a first cooling channel Q1 disposed between the central hole 110 and the outer wall of the rotor core 100, and a first groove 130 disposed on the side wall of the central hole 110. The shaft 200 is inserted into the central hole 110 and includes a cavity 210 with an opening 2101 at one end. The first groove 130 and the outer wall of the shaft 200 form a second cooling channel Q2. The first cooling channel Q1 and the second cooling channel Q2 are respectively connected to the cavity 210, allowing the cooling medium entering the cavity 210 to enter the first cooling channel Q1 and the second cooling channel Q2 respectively, for cooling the rotor core 100.

[0048] The rotor structure disclosed herein, comprising a rotor core 100 and a shaft 200, utilizes the above-described technical solution. A first cooling channel Q1 is formed between the central hole 110 and the outer side wall of the rotor core 100, and a first groove 130 is formed on the side wall of the central hole 110. When the shaft 200 is installed within the central hole 110 of the rotor core 100, the first groove 130 and the side wall of the shaft 200 form a second cooling channel Q2. Both the first cooling channel Q1 and the second cooling channel Q2 are connected to a cavity 210 with an opening 2101 at one end. This allows the cooling medium entering the cavity 210 to enter the first cooling channel Q1 and the second cooling channel Q2 respectively, thereby cooling the rotor core 100. The rotor structure of this disclosure, by incorporating the first cooling channel Q1 and the second cooling channel Q2, further enhances the heat dissipation performance of the rotor structure, thereby improving the motor's power density and continuous performance.

[0049] It should be noted that in the rotor structure of this disclosure, an axial through hole 140 is provided inside the rotor core 100 (i.e., between the central hole 110 and the outer wall of the rotor core 100), which forms a first cooling channel Q1. At the same time, a second cooling channel Q2 is provided between the rotor core 100 and the shaft 200. Both the first cooling channel Q1 and the second cooling channel Q2 are connected to the cavity 210 of the shaft 200, so that the cooling medium (e.g., lubricating oil) entering the cavity 210 through the opening 2101 can enter the first cooling channel Q1 and the second cooling channel Q2 respectively to cool the rotor core 100, thereby improving the cooling effect of the rotor structure and improving the working stability of the rotor structure.

[0050] It is understood that the second cooling channel Q2 of the first cooling channel Q1 can adopt any suitable structural form and can be connected to the cavity 210 in any suitable way. For example, it can be directly connected to the cavity 210 or indirectly connected to the cavity 210. For specific connection methods, please refer to some specific embodiments below.

[0051] In some embodiments, the first cooling channel Q1 and / or the first groove 130 axially penetrates both end faces of the rotor core 100. The first cooling channel Q1 can be a through-hole structure axially penetrating the opposite end faces of the rotor core 100, for example, it can be multiple weight-reducing holes axially extending through. For example, one end of the first cooling channel Q1 can communicate with the cavity 210, and the other end can be used to discharge the cooling medium; or, the middle position of the first cooling channel Q1 can communicate with the cavity 210, and the openings at opposite ends can be used to discharge the cooling medium. Both arrangements allow the cooling medium to flow through the first cooling channel Q1 to cool and reduce the temperature of the middle and outer regions of the rotor core 100.

[0052] In some embodiments, for example, the first groove 130 may also be a through groove extending axially through both end faces. After the stator core and the rotating shaft 200 are assembled, the first groove 130 and the outer wall of the rotating shaft 200 form a second cooling channel Q2 with openings 2101 at both ends. One end of the second cooling channel Q2 may be connected to the cavity 210, and the other end may be used to discharge the cooling medium. Alternatively, the middle position of the second cooling channel Q2 may be connected to the cavity 210, and the openings at opposite ends may be used to discharge the cooling medium. Both of these methods enable the cooling medium to flow through the second cooling channel Q2 to cool and reduce the internal area of ​​the rotor core 100.

[0053] like Figure 6 , Figures 13 to 17 As shown, optionally, the rotating shaft 200 may further include at least one first radial hole 2102, which connects the second cooling channel Q2 and the cavity 210. In some embodiments, the first radial hole 2102 is located in the middle of the rotating shaft 200 and is arranged radially along the rotating shaft 200. One end of the hole communicates with the cavity 210, and the other end extends through the outer side wall of the rotating shaft 200 and communicates with the second cooling channel Q2, thereby allowing the cooling medium to enter the second cooling channel Q2 from the cavity 210.

[0054] It is understood that in some embodiments, the sidewall of the central hole 110 is provided with multiple first grooves 130, which can form multiple second cooling channels Q2 with the rotating shaft 200. The rotating shaft 200 can also be provided with multiple first radial holes 2102, each corresponding to one of the multiple second cooling channels Q2. This allows the cooling medium in the cavity 210 to enter the multiple second cooling channels Q2 through the multiple first radial holes 2102 and exit from both ends of the second cooling channels Q2, thereby achieving cooling of the region of the rotor core 100 near the rotating shaft 200.

[0055] To further improve heat exchange efficiency, such as Figure 4 , Figure 5 , Figure 6 and Figure 9 As shown, in some embodiments of this disclosure, a heat dissipation structure 120 is formed within the first tank 130, and a first gap G is formed between the heat dissipation structure 120 and the sidewall of the first tank 130 to allow the cooling medium to flow. The heat dissipation structure 120 can be constructed using any suitable structure and is arranged inside the second cooling channel Q2 to increase the heat exchange area with the cooling medium and improve the heat exchange effect. It is understood that in order to ensure the flow of the cooling medium, the heat dissipation structure 120 needs to have a gap with the inner sidewall of the second cooling channel. For example, the heat dissipation structure 120 can form a first gap G with the sidewall of the first tank 130 to allow the cooling medium to flow inside the second cooling channel. Alternatively, the heat dissipation structure 120 can also form a first gap G with the portion of the rotating shaft 200 corresponding to the first tank 130, which can also allow the cooling medium to flow.

[0056] To further improve the connection reliability between the rotating shaft 200 and the rotor core 100, in some embodiments, the heat dissipation structure 120 extends towards the center of the central hole 110 and is interference-fitted with the outer side wall of the rotating shaft 200. The heat dissipation structure 120 not only increases the heat exchange area, but also, when the rotating shaft 200 is inserted into the central hole 110 of the rotor core 100, the heat dissipation structure 120 can be interference-fitted with the rotating shaft 200, ensuring that the rotor core 100 always maintains uniform contact with the surface of the rotating shaft 200 during high-speed rotation, thus guaranteeing stable rotor operation at high speeds.

[0057] The heat dissipation structure 120 can be constructed using any suitable structure. At least one heat dissipation structure 120 can be arranged along the axial direction to improve the interference fit with its corresponding rotating shaft 200. Of course, such as... Figure 6 and Figure 7 As shown, in some embodiments, the heat dissipation structure 120 may include a plurality of protrusions 121, which are spaced apart along the extending direction of the first groove 130. The plurality of protrusions 121 are used to further increase the heat exchange area and improve the heat dissipation effect.

[0058] The multiple protrusions 121 can be arranged along the extending direction of the first groove 130 (i.e., the second cooling channel Q2). It should be noted that each of the multiple first grooves 130 can be provided with a heat dissipation structure 120. For example, there can be multiple first grooves 130, which are arranged circumferentially at intervals along the central hole 110. The heat dissipation structure 120 can be arranged on at least some of the first grooves 130, or a heat dissipation structure 120 can be arranged inside each first groove 130, to further improve the stability of the rotor at high speed.

[0059] In some embodiments, the distance between two adjacent protrusions 121 is greater than the interference fit between the protrusion 121 and the rotating shaft 200. That is, in the same first groove 130, among the multiple protrusions 121 forming the heat dissipation structure 120, the axial distance between two adjacent protrusions 121 is greater than the interference fit between the protrusion 121 and the rotating shaft 200, which ensures the interference fit while providing sufficient space for the deformation of the protrusion 121.

[0060] In related technologies, the industry's top-level speed is approximately 21,000~22,000 rpm. Existing connection solutions between the shaft 200 and the rotor core 100 can only meet the 21,000~22,000 rpm requirement, and cannot address the issue of excessive motor vibration at further speed increases. Therefore, how to solve the vibration caused by the motor rotor structure at high speeds (>22,000 rpm) is a pressing technical problem that needs to be addressed.

[0061] The center hole 110 and the rotating shaft 200 can be constructed in any suitable manner, such as... Figure 9 and Figure 13 As shown, in some embodiments of this disclosure, the circumferential sidewall of the central hole 110 includes a first arcuate segment 111 and a first straight segment 112; the first arcuate segment 111 and the first straight segment 112 extend axially along the central hole 110 to opposite end faces of the rotor core 100; the outer sidewall of the rotating shaft 200 includes a second arcuate segment 221 and a second straight segment 222, the second arcuate segment 221 cooperating with the first arcuate segment 111 for mounting and positioning the rotating shaft 200 and the rotor core 100; the second straight segment 222 cooperating with the first straight segment 112 for limiting the circumferential rotation of the rotating shaft 200 and the rotor core 100. A first groove 130 is disposed on the first straight segment 112, and the first groove 130 and the second straight segment 222 form a second cooling channel Q2.

[0062] The rotor structure includes a rotor core 100 with a central hole 110 and a rotating shaft 200. The central hole 110 may include a first arc-shaped segment 111 and a first straight segment 112. The rotating shaft 200 may include a second arc-shaped segment 221 and a second straight segment 222. The first arc-shaped segment 111 and the second arc-shaped segment 221 cooperate for centering and positioning of the rotating shaft 200 and the rotor core 100 during installation. The first straight segment 112 and the second straight segment 222 cooperate to limit the circumferential rotation of the rotating shaft 200 and the rotor core 100, thereby ensuring torque transmission. The rotor structure disclosed herein can be applied to high-speed drive motors. Through the structural design of the arc-shaped and straight segments, it can achieve centering and positioning during installation and torque transmission, effectively improving the motor vibration problem caused by the clearance fit between the rotor core 100 and the rotating shaft 200 at high speeds.

[0063] It is understandable that the mating interface between the rotating shaft 200 and the rotor core 100 includes at least a straight section and an arc section. The straight section is used to transmit torque, while the arc section is used to facilitate the alignment and positioning of the two. The mating of the second arc section 221 on the rotating shaft 200 with the first arc section 111 on the rotor core 100, and the mating of the second straight section 222 on the rotating shaft 200 with the first straight section 112 on the rotor core 100, improves the motor vibration problem caused by the clearance fit between the rotor core 100 and the rotating shaft 200 at high speeds, thus meeting the requirements of high-speed motors.

[0064] The first arc-shaped segment 111 and the first straight segment 112 can extend through both axial end faces of the rotor core 100, that is, the first arc-shaped segment 111 and the first straight segment 112 extend axially along the center hole 110 to the two opposite end faces of the rotor core 100. Alternatively, the first arc-shaped segment 111 and the first straight segment 112 can also be partially axially positioned, serving the functions of centering and anti-torsion. The design of the first arc-shaped segment 111 and the first straight segment 112 extending axially along the center hole 110 to the two opposite end faces of the rotor core 100 increases the contact length between the second straight segment 222 of the shaft 200 and the first straight segment 112 within the center hole 110, further enhancing the anti-torsion capability.

[0065] There is at least one first arc-shaped segment 111 and one first straight segment 112 in the central hole 110 to achieve centering and anti-torsion functions, and the two can be arranged adjacently or at intervals, without specific limitations.

[0066] In some embodiments, optionally, there are multiple first arc-shaped segments 111 and multiple first straight segments 112, which are arranged alternately along the circumference of the central hole 110; there are multiple second arc-shaped segments 221 and multiple second straight segments 222, which are arranged alternately along the circumference of the rotating shaft 200; the first arc-shaped segments 111 and the second arc-shaped segments 221 correspond one-to-one; the first straight segments 112 and the second straight segments 222 correspond one-to-one; at least a portion of the first straight segments 112 have a first groove 130 formed on them. The first arc-shaped segments 111 and the second arc-shaped segments 221 are multiple and correspond one-to-one, and cooperate with each other after the rotating shaft 200 and the rotor core 100 are installed; the first straight segments 112 and the second straight segments 222 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.

[0067] Among the multiple first straight segments 112, some of the first straight segments 112 may be provided with the first groove 130, or all of the first straight segments 112 may be provided with the first groove 130. In addition, the first straight segment 112 may be provided with at least one first groove 130, or multiple first grooves 130 may be provided, which can be reasonably designed according to the specific dimensions of the first straight segment 112.

[0068] It should be noted that multiple first arc segments 111 and multiple first straight segments 112 are arranged alternately and connected end to end to form the inner wall of the central hole 110; while multiple second arc segments 221 and multiple first straight segments 112 can also be arranged alternately and connected end to end to form the outer wall of the part of the rotating shaft 200 that mates with the central hole 110.

[0069] It is understandable that the number of the first arc segment 111 and the second arc segment 221, as well as the number of the first straight segment 112 and the second straight segment 222, can be designed with any suitable number. Furthermore, the number of the first straight segment 112 can be the same as or different from the number of the first arc segment 111.

[0070] Considering that the rotor core 100 is usually formed by stacking multiple iron chips sequentially, for ease of manufacturing, in some embodiments, the number of the first arc segment 111 and the first straight segment 112 are the same as the number of pole pairs of the drive motor. The drive motor commonly uses 3 or 4 pole pairs; therefore, the first arc segment 111 and the first straight segment 112 of this disclosure can also be 3 or 4 segments.

[0071] For example, in one embodiment, there are three first arc-shaped segments 111 and three first straight segments 112, which are staggered circumferentially and connected sequentially to form the central hole 110; there are also three second arc-shaped segments 221 and three second straight segments 222, which are staggered circumferentially and connected sequentially. The three first arc-shaped segments 111 can be on the same circle centered on a point on the central axis of the central hole 110, and similarly, the three second arc-shaped segments 221 can be located at the same center of a circle centered on a point on the central axis of the rotating shaft 200, to facilitate alignment between the rotating shaft 200 and the rotor core 100.

[0072] The rotor core 100 can be constructed in any suitable manner. In some embodiments, the rotor core 100 includes a plurality of iron chips stacked sequentially along the axial direction. Each iron chip is provided with an arcuate portion corresponding to the first arcuate segment 111 and a straight portion corresponding to the first straight segment 112. Along the axial direction of the rotor core 100, in two adjacent iron chips, the straight segment of one iron chip forms a first groove 1023, and a protruding spring piece 1014 is formed in the first groove 1023. The straight segment of the other iron chip forms a second groove 1013 corresponding to the first groove 1023. The arcuate portions of the plurality of iron chips form the first arcuate segment 111, and the straight portions of the plurality of iron chips form the first straight segment 112. The first groove 1023 and the second groove 1013 form a first groove 130. The plurality of protruding spring pieces 1014 form a heat dissipation structure 120.

[0073] In some embodiments, along the axial direction of the rotor core 100, at least one of two adjacent iron cores has a raised spring tab 1014 formed on its straight portion, and the raised spring tab 1014 forms a protrusion 121. For example... Figure 11 and Figure 12 As shown, the iron chip may include a first iron chip 101 and a second iron chip 102. The first iron chip 101 includes an arc-shaped portion 1011 and a straight portion 1012. The second iron chip 102 includes an arc-shaped portion 1021 and a straight portion 1022. The straight portion 1022 of the second iron chip 102 has 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 chip 101. One end of a protruding spring piece 1014 is connected to the bottom of the groove of the second groove 1013, and the other end of the protruding spring piece 1014 extends toward the center of the first iron chip 101 and passes through the opening of the groove of the second groove 1013. Arc-shaped portion one 1011 and arc-shaped portion two 1021 form a first arc-shaped segment 111; straight portion one 1012 and straight portion two 1022 form a first straight segment 112; raised spring piece 1014 forms a raised portion 121; multiple raised spring pieces 1014 form a heat dissipation structure 120; first groove 1023 and second groove 1013 form a first groove 130. In addition, the first iron chip 101 also includes a through hole one 1015, and the second iron chip 102 also includes a through hole two 1024. Through hole one 1015 and through hole two 1024 form an axial through hole 140, i.e., a first cooling channel Q1.

[0074] For example, the rotor core 100 can be formed by stacking silicon steel sheets (iron chips). There are two types of silicon steel sheets. The two types of silicon steel sheets have the same shape and both have through holes. The inner sidewall of the through holes includes a straight part and an arc-shaped part. One type of silicon steel sheet includes a protruding spring piece 1014, and the protruding spring piece 1014 is disposed in the second groove 1013 of the straight section. The straight part of the other type of silicon steel sheet only has a first groove 1023 corresponding to the second groove 1013. Therefore, when multiple silicon steel sheets of different types are stacked together in an alternating manner, the through holes of multiple silicon steel sheets form the central hole 110 of the rotor core 100, the multiple straight parts form the first straight section 112, and the multiple arc-shaped parts form the first arc-shaped section 111. Between two adjacent silicon steel sheets with protruding spring tabs 1014, there is a silicon steel sheet without protruding spring tabs 1014. Therefore, there is a gap between the two adjacent protruding spring tabs 1014, and the size of this gap is greater than the interference fit between the protruding spring tab 1014 and the rotating shaft 200. In addition, both types of silicon steel sheets can be formed by lamination (i.e., stamping process to form their structural features).

[0075] Among them, the spring of the protruding spring 1014 protrudes to interfere with the second straight section 222 of the rotating shaft 200. The interference amount can be reasonably selected according to the design to ensure that the rotor core 100 always makes uniform contact with the surface of the rotating shaft 200 under high speed, thus ensuring the smooth operation of the rotor at high speed.

[0076] Two different silicon steel sheets are interlaced and stacked, arranged sequentially along the axial direction. The corresponding protruding spring pieces 1014 are grouped together along the axial direction. The number of groups is consistent with the number of the first straight segment 112. Alternatively, each first straight segment 112 may have at least one group of protruding spring pieces 1014, or more groups.

[0077] Currently, the rotor core 100 of mainstream drive motors all have segmented skew requirements. Therefore, the central hole 110 features of different segments of the rotor core 100 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.

[0078] like Figure 1 and Figure 2As shown, it should be noted that the rotor structure also includes a first locking ring 300 and a second locking ring 400 located at the axial ends of the rotor core 100. The first locking ring 300 and the second locking ring 400 are respectively fixedly connected to the rotating shaft 200 to limit the axial position of the rotor core 100. Specifically, the first locking ring 300 and the second locking ring 400 are located at both axial end faces of the rotor core 100 and fixedly connected to the rotating shaft 200, thereby limiting the axial movement of the rotor core 100. In the rotor structure, the rotor core 100 passes through the rotating shaft 200, and both ends are engaged with the rotating shaft 200 by the first locking ring 300 and the second locking ring 400, respectively, to axially lock and fix the rotor core 100. The first locking ring 300 and the second locking ring 400 can be fixed to the rotating shaft 200 using various methods, such as interference fit, threaded locking fit, riveting fit, etc. It is worth noting that in the embodiments of this disclosure, the first locking ring 300 and the second locking ring 400 may also have the function of weight reduction calibration dynamic balance.

[0079] One of the first locking ring 300 and the second locking ring 400 can form a connecting channel between the cavity 210 and the first cooling channel Q1, for example, as Figure 4 and Figure 18 As shown, in some embodiments, a second groove 310 is formed on the first locking ring 300, and the second groove 310 and the axial end face of the rotor core 100 form a third cooling channel Q3; a second radial hole 2103 is provided on the rotating shaft 200, one end of the first cooling channel Q1 is connected to the third cooling channel Q3, and the third cooling channel Q3 is connected to the cavity 210 through the second radial hole 2103.

[0080] The first locking ring 300 has a second groove 310 formed on its side facing the rotor core 100. When the first locking ring 300 is connected to the shaft 200 and abuts against the axial end face of the rotor core 100, the second groove 310 can form a third cooling channel Q3 with the axial end face of the rotor core 100. The shaft 200 has a second radial hole 2103. One end of the second radial hole 2103 communicates with the cavity 210 and the other end communicates with the third cooling channel Q3. The third cooling channel Q3 can also correspond to one end of the first cooling channel Q1 and communicate with the first cooling channel Q1, so that the cooling medium in the cavity 210 can enter the first cooling channel Q1 through the second radial hole 2103 and the third cooling channel Q3 to cool the rotor core 100. The first locking ring 300 and the rotor core 100 form a second cooling channel Q2 that connects the first cooling channel Q1 and the cavity 210, thus achieving the effect of connecting the two. That is, the cavity 210 and the first cooling channel Q1 are connected by an indirect connection scheme.

[0081] In some embodiments, there are multiple first cooling channels Q1, which can surround the circumference of the central hole 110 and axially penetrate both end faces of the rotor core 100. The second groove 310 can include an annular groove 312 and multiple radial grooves 311 communicating with the annular groove 312. One end of the radial groove 311 away from the annular groove 312 communicates with the second radial hole 2103; the multiple first cooling channels Q1 communicate with the annular groove 312. Specifically, one end of each of the multiple first cooling channels Q1 can correspond to and communicate with the annular groove 312, and one end of the radial groove 311 communicates with the annular groove 312, while the other end corresponds to the second radial hole 2103, thus achieving communication with the cavity 210.

[0082] It should be noted that, in order to achieve communication between the multiple first cooling channels Q1 and the annular groove 312, the annular groove 312 can have openings at the ends of the multiple first cooling channels Q1 in the axial direction. That is, the projection of the openings of the multiple first cooling channels Q1 near the annular groove 312 is located within the projected area of ​​the annular groove 312, so that the openings of the multiple first cooling channels Q1 are located between the two side walls of the annular groove 312, so as to facilitate the cooling medium to enter the first cooling channels Q1 better.

[0083] It should be noted that the widths of the annular groove 312 and the radial groove 311 can be the same, or they can be arranged with different widths. In addition, the first cooling channel Q1, the first radial hole 2102 and the second radial hole 2103 are, but are not limited to, circular holes, or other hole shapes.

[0084] To further improve the uniformity of cooling medium distribution, in some embodiments, one end of the radial groove 311 away from the second radial hole 2103 is connected to the middle of the annular groove 312 between two adjacent first cooling channels Q1. For example... Figure 18 As shown, the first locking ring 300 has an annular groove 312 and three radial grooves 311 communicating with the side of the annular groove 312. The three radial grooves 311 can be arranged in a centrally symmetrical manner. When the first locking ring 300 is installed on the rotating shaft 200, the connection between one of the radial grooves 311 and the annular groove 312 can be located between two adjacent first cooling channels Q1, so that the cooling medium entering the annular groove 312 can flow evenly to both sides to distribute to different first cooling channels Q1.

[0085] To facilitate the drainage of cooling medium at the other end of the first cooling channel Q1, such as Figure 19As shown, in some embodiments, a first through hole 410 is formed on the second locking ring 400. The first through hole 410 corresponds to the end of the first cooling channel Q1 away from the first locking ring 300, and is used for the discharge of cooling medium in the first cooling channel Q1. There can be multiple first through holes 410 on the second locking ring 400. The multiple first through holes 410 respectively correspond to the openings of multiple first cooling channels Q1 away from the first locking ring 300, so that the cooling medium in the first cooling channel Q1 can be discharged through the first through hole 410 for recycling.

[0086] The present disclosure provides an electric motor including a stator structure and the rotor structure described above. Since the rotor structure adopts the structure of the above embodiment, the electric motor also has all the advantages of the rotor structure described above.

[0087] Embodiments of this disclosure also provide a vehicle that includes the motor described above, and therefore the vehicle also possesses the advantages of the motor described above, which will not be repeated here.

[0088] The rotor structure, motor, and vehicle disclosed herein include a rotor core 100 and a shaft 200. A first cooling channel Q1 is formed between the central hole 110 of the rotor core 100 and its outer side wall, and a first groove 130 is formed on the side wall of the central hole 110. When the shaft 200 is installed in the central hole 110 of the rotor core 100, the first groove 130 and the side wall of the shaft 200 form a second cooling channel Q2. Both the first cooling channel Q1 and the second cooling channel Q2 are connected to a cavity 210 with an opening 2101 at one end, allowing the cooling medium entering the cavity 210 to enter the first cooling channel Q1 and the second cooling channel Q2 respectively to cool the rotor core 100. The rotor structure of this disclosure, due to the provision of the first cooling channel Q1 and the second cooling channel Q2, can further improve the heat dissipation performance of the rotor structure, which is beneficial for improving the power density and continuous performance of the motor.

[0089] Furthermore, by arranging the protruding springs 1014 of the heat dissipation structure 120 in the first cooling channel Q1, the heat exchange area is further increased, and the heat dissipation effect is improved.

[0090] Furthermore, the central hole 110 includes a first arc-shaped segment 111 and a first straight segment 112, and the rotating shaft 200 includes a second arc-shaped segment 221 and a second straight segment 222. The first arc-shaped segment 111 and the second arc-shaped segment 221 cooperate to center and position the rotating shaft 200 and the rotor core 100 during installation. The first straight segment 112 and the second straight segment 222 cooperate to limit the circumferential rotation of the rotating shaft 200 and the rotor core 100, thereby ensuring torque transmission. The rotor structure disclosed herein can be applied to high-speed drive motors. Through the structural design of the arc-shaped and straight segments, it can achieve centering and positioning during installation and torque transmission, effectively improving the motor vibration problem caused by the clearance fit between the rotor core 100 and the rotating shaft 200 at high speeds.

[0091] In addition, the heat dissipation structure 120 (protruding spring 1014) can achieve an interference fit with the outer wall of the rotating shaft 200, ensuring the stability of the rotor structure at high speed, thereby realizing the smooth operation of the rotor structure at high speed. The structure is simple and easy to produce and promote.

[0092] 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.

[0093] 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.

[0094] 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 in that, include: The rotor core includes a central hole extending axially through its two end faces, and a first slot disposed on the sidewall of the central hole; the circumferential sidewall of the central hole includes a first arc-shaped segment and a first straight segment; and A rotating shaft is inserted into the central hole and includes a cavity with one end open; the first groove and the outer wall of the rotating shaft form a second cooling channel, which communicates with the cavity, so that the cooling medium entering the cavity can enter the second cooling channel to cool the rotor core; The outer wall of the rotating shaft includes a second arc-shaped segment and a second straight segment. The second arc-shaped segment cooperates with the first arc-shaped segment for mounting and positioning 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. A heat dissipation structure is formed in the first groove. The heat dissipation structure includes a plurality of protrusions that extend toward the center of the central hole and are interference-fitted with the outer side wall of the rotating shaft. The plurality of protrusions are arranged at intervals along the extension direction of the first groove. The distance between two adjacent protrusions is greater than the interference fit between the protrusion and the shaft.

2. The rotor structure according to claim 1, characterized in that, The rotor core also includes a first cooling channel disposed between the central hole and the outer side wall of the rotor core; The first cooling channel is connected to the cavity, and the first cooling channel and the second cooling channel are connected in parallel, so that the cooling medium entering the cavity can enter the first cooling channel and the second cooling channel respectively to cool the rotor core.

3. The rotor structure according to claim 2, characterized in that, The first cooling channel and / or the first groove extends axially through both end faces of the rotor core.

4. The rotor structure according to claim 1, characterized in that, The shaft includes a first radial hole that connects the second cooling channel and the cavity.

5. The rotor structure according to claim 1, characterized in that, A first gap is formed between the heat dissipation structure and the side wall of the first tank to allow the cooling medium to flow.

6. The rotor structure according to claim 1, characterized in that, The first arc-shaped segment and the first straight segment extend axially along the central hole to the opposite end faces of the rotor core; The first tank is located on the first straight segment, and the first tank and the second straight segment form the second cooling channel.

7. The rotor structure according to claim 1, characterized in that, There are multiple first arc-shaped segments and multiple first straight segments, and the multiple first arc-shaped segments and first straight segments are arranged alternately along the circumference of the central hole; There are multiple second arc-shaped segments and multiple second straight segments, which are arranged alternately along the circumference of the axis of rotation; The first arc segment and the second arc segment correspond one-to-one; the first straight line segment and the second straight line segment correspond one-to-one. The first groove is formed on at least a portion of the first straight segment.

8. The rotor structure according to claim 7, characterized in that, The number of the first arc segment and the number of the first straight segment are the same as the number of pole pairs of the drive motor.

9. The rotor structure according to claim 1, characterized in that, The rotor core includes a plurality of iron chips stacked sequentially along the axial direction. Each iron chip is provided with an arc-shaped portion corresponding to the first arc segment and a straight portion corresponding to the first straight segment. Along the axial direction of the rotor core, in two adjacent iron chips, a first groove is formed in the straight segment of one iron chip, and a protruding spring piece is formed in the first groove; a second groove is formed in the straight segment of the other iron chip, corresponding to the first groove. The arc-shaped portions of the plurality of iron chips form the first arc-shaped segment, and the straight portions of the plurality of iron chips form the first straight segment; the first groove and the second groove form the first groove body; and the plurality of protruding spring pieces form the heat dissipation structure.

10. The rotor structure according to any one of claims 2-9, characterized in that, The rotor structure further includes a first locking ring and a second locking ring disposed at the axial end of the rotor core. The first locking ring and the second locking ring are respectively fixedly connected to the rotating shaft to limit the axial position of the rotor core.

11. The rotor structure according to claim 10, characterized in that, A second groove is formed on the first locking ring, and the second groove and the axial end face of the rotor core form a third cooling channel; The rotating shaft is provided with a second radial hole, one end of the first cooling channel is connected to the third cooling channel, and the third cooling channel is connected to the cavity through the second radial hole.

12. The rotor structure according to claim 11, characterized in that, The first cooling channel has multiple channels; The second groove includes an annular groove and a plurality of radial grooves communicating with the annular groove, wherein one end of the radial groove away from the annular groove is connected to the second radial hole; Multiple first cooling channels are connected to the annular groove.

13. The rotor structure according to claim 12, characterized in that, The end of the radial groove away from the second radial hole is connected to the middle of the annular groove between two adjacent first cooling channels.

14. The rotor structure according to claim 10, characterized in that, The second locking ring has a first through hole, which corresponds to the end of the first cooling channel away from the first locking ring, and is used for the discharge of cooling medium in the first cooling channel.

15. An electric motor, characterized in that, The rotor structure includes any one of claims 1-14.

16. A vehicle, characterized in that, Includes the motor as described in claim 15.

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