electric machine

Abstract

The application discloses a motor. The motor comprises a stator assembly and a rotor assembly, and the rotor assembly comprises a rotor core, a rotating shaft and an end plate. The rotor assembly is internally provided with a first oil conveying channel and a second oil conveying channel. The two side end faces of the rotor core are provided with a first oil outlet communicated with the first oil conveying channel and an oil inlet communicated with the second oil conveying channel. The side face of each end plate close to the rotor core is provided with a third oil conveying channel, and the two ends of the third oil conveying channel are communicated with the first oil outlet and the oil inlet respectively. The side face of the end plate is taken as a reference line with the end plate radius of the first connecting end as the reference line. In the direction from the first connecting end to the second connecting end, the third oil conveying channel gradually deviates from the reference line in the direction opposite to the rotating direction of the rotor assembly. Through the above structural design, the flow resistance of the cooling liquid can be reduced, so that the initial speed and flow of the cooling liquid when the cooling liquid is output from the rotor assembly and sprayed towards the stator assembly are enhanced, and the cooling effect is improved.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a motor. Background Technology

[0002] Currently, new energy vehicle motors are developing towards higher efficiency, higher power density, and higher volumetric density. To improve motor power and efficiency while reducing its size and weight, efficient cooling is necessary. For more effective motor cooling, the mainstream method is currently stator and rotor liquid cooling. Specifically: The heat generated by the stator and its windings requires liquid cooling. Therefore, flow path design and machining are necessary on the motor housing to create stator flow channels. Coolant is then transported through these channels, allowing the stator to be sprayed or immersed in the coolant for cooling. However, the stator flow channel structure is complex, resulting in significant processing difficulties and high production costs. Rotor flow channels are generally either axially cooled or naturally cooled. Axial cooling refers to the opening of rotor flow channels along the center line of the rotor shaft. When the coolant passes through the rotor flow channels, it can cool the rotor shaft, thereby cooling the entire rotor through the rotor shaft. Natural cooling refers to the use of rotor flow channels designed inside the rotor to allow air or other cooling media to flow naturally, thereby carrying away the heat generated by the rotor during operation and achieving passive heat dissipation without the need for additional power.

[0003] Whether it is shaft cooling or natural cooling, the rotor flow channel has the problems of complex structure and excessive length, resulting in high flow resistance, which deteriorates the cooling effect. Utility Model Content

[0004] In view of this, the purpose of this application is to provide an electric motor that can reduce the flow resistance of the coolant, thereby increasing the initial velocity and flow rate of the coolant when it is output from the rotor assembly and sprayed toward the stator assembly, and improving the cooling effect.

[0005] To achieve the above objectives, this application provides the following technical solution: An electric motor includes a stator assembly and a rotor assembly, the stator assembly being sleeved outside the rotor assembly, the rotor assembly comprising: Rotor core; The rotating shaft, located at the center of the rotor core, is used to drive the rotor core to rotate around its own central axis; End plates are located at both ends of the rotor core and are fixedly connected to at least one of the rotor core and the rotating shaft; The rotor assembly is provided with a first oil delivery channel and a second oil delivery channel inside. Both ends of the rotor core are provided with a first oil outlet communicating with the first oil delivery channel and an oil inlet communicating with the second oil delivery channel. Each end plate has a third oil channel on its side near the rotor core. The first connecting end of the third oil channel is connected to the first oil outlet, and the second connecting end of the third oil channel is connected to the oil inlet. Furthermore, taking the radius of the end plate passing through the first connecting end in the side of the end plate as a reference line, the third oil channel gradually deviates from the reference line in the direction from the first connecting end to the second connecting end in a direction opposite to the rotation direction of the rotor assembly.

[0006] Optionally, in the above-mentioned motor, the third oil delivery channel is a strip-shaped groove extending along the shape of a helical segment, and the rotation direction of the helical segment is opposite to the rotation direction of the rotor assembly.

[0007] Optionally, in the above-mentioned motor, the third oil delivery channel is a strip-shaped groove extending along a parabolic shape, and the opening direction of the parabola is opposite to the rotation direction of the rotor assembly.

[0008] Optionally, in the above-mentioned motor, the rotor core is sleeved on the rotating shaft through a first central hole, and the first oil delivery channel is formed between the inner wall of the first central hole and the side wall of the rotating shaft.

[0009] Optionally, in the above-mentioned motor, the inner wall of the first central hole includes a plurality of straight through slots spaced apart along the circumference, and the slot opening of each straight through slot respectively cooperates with the side wall of the rotating shaft to form the first oil delivery channel of the straight through hole structure.

[0010] Optionally, in the above-mentioned motor, the interior of the rotating shaft is provided with: The oil inlet channel extends axially along the shaft. The oil distribution channel is located at or near the axial center of the rotating shaft, extends radially along the rotating shaft, and is connected at one end to the oil inlet channel and at the other end to the first oil delivery channel.

[0011] Optionally, in the above-mentioned motor, the rotating shaft is provided with multiple oil distribution channels at circumferential intervals along the oil inlet channel.

[0012] Optionally, in the above-mentioned motor, the second oil delivery channel passes through both ends of the rotor core; One end of the second oil channel is the oil inlet, and the other end is the second oil outlet. The oil inlet and the second oil outlet are located on the two end faces of the rotor core, respectively. The end plate is provided with an oil outlet hole that runs through both sides of the end plate. One end of the oil outlet hole is connected to the second oil outlet, and the other end is open towards the stator assembly.

[0013] Optionally, in the above-mentioned motor, on one side end face of the rotor core, a plurality of oil inlets and a plurality of second oil outlets are arranged circumferentially around the rotating shaft; on the other side end face of the rotor core, a plurality of oil inlets and a plurality of second oil outlets are arranged circumferentially around the rotating shaft.

[0014] Optionally, in the above-mentioned motor, the inner wall of the oil outlet includes: The first inclined surface has one end connected to the second oil outlet and the other end extending into the oil outlet hole and extending towards the stator assembly. The first flat surface is located on the opposite side of the first inclined surface and is parallel to the central axis of the rotating shaft; The second inclined surface has one end connected to the first straight surface and the other end located on the side of the end plate away from the rotor core, and is closer to the stator assembly than the first straight surface. The second straight surface is located on the opposite side of the second inclined surface and is connected to the first inclined surface.

[0015] As can be seen from the above technical solution, during the operation of the motor provided in this application, the coolant can enter the rotor assembly through the internal oil passages of the shaft, or enter the rotor assembly from other locations within the rotor assembly. It is then output through the first oil delivery channel and the first oil outlet in the rotor core. After passing through the third oil delivery channel on the inner side of the end plate, it flows back to the second oil delivery channel located inside the rotor core, and is then output to the outside of the rotor assembly. During this process, because the third oil delivery channel in the end plates located at both ends of the rotor core extends and deflects along the direction of coolant ejection, its structure, relative to the channel extending radially along the rotor, can better reduce flow resistance as the coolant passes through the end plates and flows back into the rotor core. This helps to increase the initial velocity and flow rate of the coolant when it is output from the rotor assembly and sprayed towards the stator assembly, thus enhancing the cooling effect. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional view of a combined structure of a stator assembly and a rotor assembly provided in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the internal flow channel of a rotating shaft provided in an embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the inner side (the side end face near the rotor core) of a first end plate provided in an embodiment of this application.

[0020] Figure 4 This is a schematic diagram of the inner side (the side end face near the rotor core) of a second end plate provided in an embodiment of this application.

[0021] Figure 5 A cross-sectional view of an oil outlet hole located in a first end plate, provided for an embodiment of this application.

[0022] Figure 6 A cross-sectional view of an oil outlet hole located in the second end plate, provided for an embodiment of this application.

[0023] Figure 7 A schematic diagram of the side end face structure of a rotor core near the second end plate provided in an embodiment of this application (the dashed arrows in the figure indicate the flow path and direction of the coolant). Figure 8 This is a schematic diagram of a rotor core provided in an embodiment of this application. (The dashed arrows in the diagram indicate the flow path and direction of the coolant, and also the location of the second oil delivery channel.) Figure 9 for Figure 1 This diagram illustrates the flow path and direction of the coolant inside the motor. (The thick arrows in the diagram indicate the coolant flow path and direction.) in: 1-Stator assembly, 2-Rotor assembly, 21-Rotor core, 22-Shaft, 23-First end plate, 24-Second end plate, 211-First center hole, 231-Second center hole, 241-Third center hole, 311-Oil inlet channel, 312-Oil distribution channel, 321-Third oil delivery channel, 322-Oil outlet hole, 321a-First connecting end, 321b-Second connecting end, 3221-First inclined surface, 3222-First straight surface, 3223-Second inclined surface, 3224-Second inclined surface, 330-First oil delivery channel, 331-First oil outlet, 332-Oil inlet, 333-Second oil outlet. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Please see Figure 1 and Figure 3This application provides an electric motor, which includes a stator assembly 1 and a rotor assembly 2. The rotor assembly 2 is rotatably fitted inside the stator assembly 1. Specifically, the rotor assembly 2 includes a rotor core 21, a shaft 22, and end plates. The shaft 22 is located at the center of the rotor core 21 and is used to drive the rotor core 21 to rotate around its own central axis. The end plates include a first end plate 23 and a second end plate 24, which are located at both ends of the rotor core 21. The first end plate 23 and the second end plate 24 are fixedly connected to at least one of the rotor core 21 and the shaft 22, so that the shaft 22, the rotor core 21, the first end plate 23, and the second end plate 24 constitute an integral structural assembly, forming the main body of the rotor assembly 2.

[0026] The rotor assembly 2 has a first oil delivery channel 330 and a second oil delivery channel 334 inside. Both end faces of the rotor core 21 have a first oil outlet 331 and an oil inlet 332. The first oil outlet 331 is connected to the first oil delivery channel 330, and the oil inlet 332 is connected to the second oil delivery channel 334. It should be noted that... Figure 1 The second oil delivery channel 334 is not shown in the diagram. For the specific location of the second oil delivery channel 334, please refer to [reference needed]. Figure 8 The horizontal dashed arrow indicates the location of the arrow and the coolant path and direction within the second oil channel 334. Additionally, please refer to... Figure 3 and Figure 4 ,as well as Figure 8 In the first end plate 23 and the second end plate 24, each end plate has a third oil channel 321 on its side near the rotor core 21. The first connecting end 321a of the third oil channel 321 is used to communicate with the first oil outlet 331 on the rotor core 21, and the second connecting end 321b of the third oil channel 321 is used to communicate with the oil inlet 332 on the rotor core 21. Furthermore, taking the radius of the end plate passing through the first connecting end 321a on the side of the end plate as the reference line L, in the direction from the first connecting end 321a to the second connecting end 321b, the third oil channel 321 gradually deviates from the reference line L in a direction opposite to the rotation direction f of the rotor assembly 2; in other words, the line connecting the first connecting end 321a and the second connecting end 321b deflects relative to the aforementioned reference line L by a preset angle z greater than zero, and its deflection direction is opposite to the rotation direction f of the rotor assembly 2. Wherein, the distance r2 between the second connecting end 321b and the center Q of the end plate is greater than the distance r1 between the first connecting end 321a and the center Q of the end plate; and, in the direction opposite to the rotation direction f of the rotor assembly 2, the line connecting the second connecting end 321b and the center Q of the end plate is deflected by a preset angle δ greater than zero relative to the line connecting the first connecting end 321a and the center Q of the end plate.

[0027] In some embodiments, each end plate near the rotor core 21 has multiple grooved third oil channels 321 arranged circumferentially around the shaft 22. Each third oil channel 321 is a curved groove extending in the form of a spiral or parabolic segment, or each third oil channel 321 can be an inclined straight groove. The inclination direction (or deflection direction) of each third oil channel 321 is opposite to the rotor rotation direction f, so as to conform to the deflection direction of the coolant when it flows out of the rotor core end face, thereby helping to reduce flow resistance.

[0028] In the motor provided in this embodiment, during operation, coolant can enter the rotor assembly 2 through the internal oil passages of the shaft 22, or enter the rotor assembly 2 from other locations within the rotor assembly 2. It is then output through the first oil delivery channel 330 and the first oil outlet 331 in the rotor core 21. After passing through the third oil delivery channel 321 on the inner side of the end plate, it flows back to the second oil delivery channel 334 located inside the rotor core 21, and is then output to the outside of the rotor assembly 2. During this process, because the third oil delivery channel 321 for conveying coolant in the first end plate 23 and the second end plate 24 located at both ends of the rotor core 21 extends and deflects along the coolant ejection direction, its flow resistance is better reduced compared to the flow channel structure extending radially along the rotor, as it flows back through the end plate to the inside of the rotor core 21. This helps increase the initial velocity and flow rate of the coolant when it is output from the rotor assembly 2 and sprayed towards the stator assembly 1, thus enhancing the cooling effect.

[0029] In some embodiments, the third oil delivery channel 321 is a strip-shaped groove extending along a helical segment, the rotation direction of which is opposite to the rotation direction f of the rotor assembly 2. Specifically, see [link to relevant documentation]. Figure 3 and combined Figure 7 and Figure 8It can be seen that the two ends of the third oil delivery channel 321 extending along the spiral segment shape are the first connecting end 321a and the second connecting end 321b, respectively. The first connecting end 321a is connected to the first oil outlet 331, and the second connecting end 321b is connected to the oil inlet 332. The rotation direction of the spiral segment (that is, the deflection direction of the spiral segment) is opposite to the rotation direction f of the rotor assembly 2. Furthermore, in the extension direction from the first connecting end 321a to the second connecting end 321b, the radius of the spiral segment gradually increases, that is, the distance between any point in the third oil delivery channel 321 and the central axis of the rotating shaft gradually increases. Here, "spiral segment" refers to a finite curve segment cut from a spiral. A spiral is a curve formed by spiraling outward from a fixed point, and its shape is similar to that of a mosquito coil or record pattern. When the extension trajectory of the third oil channel 321 is a spiral segment, the polar angle and polar diameter of any point on the extension trajectory and its adjacent points can be calculated. If the polar diameter changes monotonically with the polar angle (increasing or decreasing) and there is no foldback or self-intersection, then the third oil channel 321 can be considered to extend along the spiral segment shape.

[0030] In some embodiments, the third oil delivery channel 321 is a strip-shaped groove extending along a parabolic shape, with the opening direction of the parabola opposite to the rotation direction f of the rotor assembly 2. Specifically, the connection method and bending direction of the parabolic third oil delivery channel 321 are the same as those of the helical segment-shaped third oil delivery channel 321, and therefore can also be referred to... Figure 3 as well as Figure 7 and Figure 8 It can be seen that the two ends of the third oil delivery channel 321, which extends along a parabolic shape, are the first connecting end 321a and the second connecting end 321b, respectively. The first connecting end 321a is connected to the first oil outlet 331 on the rotor core 21, and the second connecting end 321b is connected to the oil inlet 332. The opening direction of the parabola (i.e., the deflection direction of the parabola) is opposite to the rotation direction f of the rotor assembly 2. Furthermore, in the extension direction from the first connecting end 321a to the second connecting end 321b, the distance between any point in the third oil delivery channel 321 and the central axis of the rotating shaft gradually increases. Here, "parabola" refers to the locus of points in a plane that are equidistant from a fixed point (foci) and a fixed straight line (directrix). When the extension trajectory of the third oil delivery channel 321 is a parabola, if the curve formed by the extension trajectory can be expressed in the form y=ax 2 +bx+c or x=ay 2 If the equation is described by a quadratic equation (where a, b, and c are constants, and a ≠ 0), then the third oil channel 321 can be considered to extend along a parabolic shape.

[0031] Please see Figure 1In some embodiments, the rotor core 21 has an annular structure, which is fitted onto the rotating shaft 22 through the first central hole 211 of the annular structure. The inner wall of the first central hole 211 of the rotor core 21 and the side wall of the rotating shaft 22 cooperate to form a first oil delivery channel 330. For example, in a specific implementation, the first oil delivery channel 330 can be formed by providing linear through-slots (straight or curved) on the inner wall of the first central hole 211. In this case, the inner wall of the first central hole 211 of the rotor core 21 includes multiple linear through-slots spaced circumferentially. The opening of each linear through-slot (an opening extending along the length of the through-slot) cooperates with the side wall of the rotating shaft 22, and the other areas of the inner wall of the first central hole 211 outside the linear through-slots are tightly fitted with the side wall of the rotating shaft 22, thereby allowing the oil to flow through the linear through-slots on the inner wall of the first central hole 211. The first oil channel 330, which forms a straight through-hole structure with the side wall of the matching rotating shaft 22, has its two ends located on the two end faces of the rotor core 22, forming a first oil outlet 331 for connecting with the third oil channel 321 on the inner side of the end plate. Thus, the coolant sequentially passes through the first oil channel 330, the first oil outlet 331, the third oil channel 321, the oil inlet 332, and the second oil channel 334 (located inside the rotor core). For details on the specific structure and location of the first oil channel 330 and the first oil outlet 331, please refer to [reference needed]. Figure 1 and Figure 7 For information on coolant flow path and direction, please refer to [link / reference]. Figures 7 to 9 In the diagram, both the dashed arrows and the large arrows indicate the flow path and direction of the coolant.

[0032] However, this is not the only option. In other embodiments, the first oil channel 330 can also be formed by creating linear grooves on the sidewall of the rotating shaft 22. In this case, multiple linear grooves (straight or curved) are spaced circumferentially on the sidewall of the rotating shaft 22. The opening of each linear groove (an opening extending along the length of the groove) mates with the inner wall of the first central hole 211. Furthermore, other areas on either side of the linear grooves on the sidewall of the rotating shaft 22 are tightly fitted to the inner wall of the first central hole 211. Thus, the linear grooves on the sidewall of the rotating shaft 22 and the inner wall of the matching first central hole 211 form a through-hole structure for the first oil channel 330. The two ends of the first oil channel 330 are located on the two end faces of the rotor core 22, forming a first oil outlet 331, which communicates with the third oil channel 321 on the inner side of the end plate. The coolant flow path and direction are consistent with... Figure 3 , Figure 4 and Figure 8 The coolant flow paths and directions shown are basically the same.

[0033] Please see Figure 2In some embodiments, the interior of the rotating shaft 22 is provided with an oil inlet channel 311 and multiple oil distribution channels 312. The multiple oil distribution channels 312 are arranged circumferentially around the oil inlet channel 311 to uniformly distribute the coolant. The oil inlet channel 311 extends along the axial direction of the rotating shaft 22. Each oil distribution channel 312 is located in the central section of the rotating shaft 22 (i.e., near the axial center of the rotating shaft 22), extends radially along the rotating shaft 22, and is perpendicular to the axial direction of the rotating shaft 22. One end of each oil distribution channel 312 is connected to the oil inlet channel 311, and the other end is connected to the first oil delivery channel 330 located between the rotating shaft 22 and the rotor core 21. Therefore, during motor operation, coolant can enter the rotor assembly 2 through the oil inlet channel 311 inside the shaft 22, and then diffuse around the shaft 22 through the oil distribution channel 312. After passing through the first oil supply channel 330, the first oil outlet 331, the third oil supply channel 321, the second oil supply channel 334, and the oil outlet hole 322 located in the end plate, it is sprayed onto the stator assembly 1, thereby cooling the rotor assembly 2 and the stator assembly 1. Since the first oil supply channel 330, the first oil outlet 331, the third oil supply channel 321, the second oil supply channel 334, and the oil outlet hole 322 are all circumferentially spaced and equidistantly arranged around the rotor's central axis, the coolant can be evenly distributed in the rotor assembly 2, and evenly distributed to the first end plate 23, the second end plate 24, and the end windings of the stator assembly 1, achieving uniform heat dissipation inside the motor.

[0034] In some embodiments, the second oil delivery channel 334 extends through both ends of the rotor core 21; correspondingly, a second oil outlet 333 and an oil inlet 332 are provided on both end faces of the rotor core 21, and the second oil outlet 333 and the oil inlet 332 are located at both ends of the second oil delivery channel 334 and are connected to the second oil delivery channel 334. See details... Figure 7 and Figure 8 Each of the second oil delivery channels 334 has an oil inlet 332 at one end and a second oil outlet 333 at the other end, meaning the oil inlet 332 and the second oil outlet 333 are located on opposite end faces of the rotor core 21. The coolant flows in opposite directions within adjacent second oil delivery channels 334. Therefore, as... Figure 7 and Figure 8 As shown, the oil inlet 332 and the second oil outlet 333 located on the same side end face of the rotor core 21 are arranged circumferentially around the rotating shaft 22. That is, on one side end face of the rotor core 21, multiple oil inlets 332 and multiple second oil outlets 333 are arranged circumferentially around the rotating shaft 22; on the other side end face of the rotor core 21, multiple oil inlets 332 and multiple second oil outlets 333 are arranged circumferentially around the rotating shaft 22.

[0035] Correspondingly, the first end plate 23 and the second end plate 24 are respectively provided with oil outlet holes 322 penetrating both sides of the end plate. One end of the oil outlet hole 322 is located on the inner side of the end face and communicates with the second oil outlet 333 located on the side end face of the rotor core 21; the other end of the oil outlet hole 322 is located on the outer side of the end face and its opening faces the stator assembly 1, and is used to spray coolant onto the stator assembly 1.

[0036] In some embodiments, in the first end plate 23 and the second end plate 24, at least a portion of the inner wall of the oil outlet 322 is a guide slope. For example, please refer to... Figure 5 and Figure 6 Each oil outlet 322 has a rectangular opening (or a trapezoidal opening) for both its inlet and outlet. The inner wall of each oil outlet 322 includes a first inclined surface 3221, a first straight surface 3222, a second inclined surface 3223, and a second straight surface 3224. One end of the first inclined surface 3221 is connected to the second oil outlet 333, and the other end extends into the oil outlet 322 and towards the stator assembly 1. The first straight surface 3222 is located on the opposite side of the first inclined surface 3221 and is parallel to the central axis of the rotating shaft 22. One end of the second inclined surface 3223 is connected to the first straight surface 3222, and the other end is located on the side of the end plate away from the rotor core 21 and is closer to the stator assembly 1 than the first straight surface 3222. The second straight surface 3224 is located on the opposite side of the second inclined surface 3223 and is connected to the first inclined surface 3221. During motor operation, the first inclined surface 3221 and the second inclined surface 3223 within the oil outlet 322 guide the coolant to be sprayed more precisely onto the stator assembly 1, while also reducing flow resistance and shortening the flow channel length. Specifically, during rotor assembly 2 rotation, the coolant flowing from the second oil outlet 333 of the rotor core 21 enters the oil outlet 322 within the end plate, first contacting the first inclined surface 3221 and the first flat surface 3222, and then contacting the second inclined surface 3223 and the second flat surface 3224. Under the action of centrifugal force and the guiding effect of the first inclined surface 3221 and the second inclined surface 3223, the coolant is thrown towards both ends of the stator assembly 1, thereby cooling the stator assembly 1. In this process, the first inclined surface 3221 and the second inclined surface 3223 help reduce flow resistance and increase coolant flow rate. It should be noted that the inclination angle of the above-mentioned inclined surface (especially the second inclined surface 3223) needs to be specifically designed according to the location of the end winding of the stator assembly 1 and its relative position with the outer side of the end plate. The purpose is to allow the coolant to be directly thrown towards the end winding of the stator assembly 1 along the inclination angle of the second inclined surface 3223, so as to cool the end winding of the stator assembly 1.

[0037] In the motor provided in this application, the above-mentioned structural design enables the coolant to be sprayed evenly onto the windings of the stator assembly 1 and the rotor core 21, thereby eliminating the need for a separate cooling system in the stator assembly 1. Cooling is achieved entirely by the liquid jetting from the rotor assembly 2. The system is simple and helps to reduce manufacturing costs and design difficulty.

[0038] In summary, the path of the internal coolant of the motor provided in this application during operation can be found in [reference needed]. Figure 1 and Figure 9 The coolant enters the rotor assembly 2 from one end of the shaft 22. After passing through the oil inlet channel 311 inside the shaft 22, it is divided by multiple oil distribution channels 312 and enters multiple first oil delivery channels 330 inside the rotor core 21. At the connection between the oil distribution channel 312 and the first oil delivery channel 330, it flows in two directions along the first oil delivery channel 330 to both ends of the rotor core 21. When the coolant encounters the first end plate 23 / second end plate 24, it first enters the third oil delivery channel 321 and is guided by the third oil delivery channel 321 into the second oil delivery channel 334. It passes through the entire rotor core 21 until it enters the oil outlet hole 322 of the second end plate 24 / first end plate 23. At this time, the coolant is guided by the ramp in the oil outlet hole 322 to adjust the angle and is thrown onto the windings of the stator assembly 1 and the rotor core 21. Thus, the rotor assembly 2 and the stator assembly 1 can be cooled synchronously through one cycle. It should be noted that during the above process, the first end plate 23 and the second end plate 24 respectively throw coolant to both ends of the rotor assembly 2.

[0039] As can be seen, in the motor provided by the embodiments of this application, not only is the flow channel structure for the coolant in the rotor assembly 2 simple, but the stator assembly 1 can also be without a flow channel, thereby reducing the amount of flow channel processing and reducing flow resistance. At the same time, it can also ensure that the coolant is evenly distributed inside the rotor assembly 2 and flows evenly to both ends of the rotor core 21, making the cooling effect more uniform and efficient, and avoiding the risk of demagnetization of the magnets due to insufficient cooling.

[0040] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed.

[0041] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electric motor comprising a stator assembly (1) and a rotor assembly (2), the stator assembly (1) being sleeved on the rotor assembly (2), the rotor assembly (2) comprising: Rotor core (21); The rotating shaft (22) is located at the center of the rotor core (21) and is used to drive the rotor core (21) to rotate around its own central axis; End plates are located at both ends of the rotor core (21) and are fixedly connected to at least one of the rotor core (21) and the rotating shaft (22); Its features are, The rotor assembly (2) is provided with a first oil delivery channel (330) and a second oil delivery channel (334) inside. Both ends of the rotor core (21) are provided with a first oil outlet (331) communicating with the first oil delivery channel (330) and an oil inlet (332) communicating with the second oil delivery channel (334). Each end plate has a third oil channel (321) on its side near the rotor core (21). The first connecting end (321a) of the third oil channel (321) is connected to the first oil outlet (331), and the second connecting end (321b) of the third oil channel (321) is connected to the oil inlet (332). Furthermore, with the radius of the end plate passing through the first connecting end (321a) on the side of the end plate as the reference line (L), the third oil channel (321) gradually deviates from the reference line (L) in the direction from the first connecting end (321a) to the second connecting end (321b) in the opposite direction to the rotation direction (f) of the rotor assembly (2).

2. The motor according to claim 1, characterized in that, The third oil delivery channel (321) is a strip-shaped groove extending along the shape of a spiral segment, the rotation direction of which is opposite to the rotation direction (f) of the rotor assembly (2).

3. The motor according to claim 1, characterized in that, The third oil delivery channel (321) is a strip-shaped groove extending along a parabolic shape, and the opening direction of the parabola is opposite to the rotation direction (f) of the rotor assembly (2).

4. The motor according to claim 1, characterized in that, The rotor core (21) is sleeved on the rotating shaft (22) through the first central hole (211), and the first oil delivery channel (330) is formed between the inner wall of the first central hole (211) and the side wall of the rotating shaft (22).

5. The motor according to claim 4, characterized in that, The inner wall of the first central hole (211) includes a plurality of straight through slots spaced apart along the circumference. The opening of each straight through slot is respectively engaged with the side wall of the rotating shaft (22) to form the first oil delivery channel (330) with a straight through hole structure.

6. The motor according to claim 1, characterized in that, The internal structure of the rotating shaft (22) includes: The oil inlet channel (311) extends axially along the rotating shaft (22); The oil distribution channel (312) is located at or near the axial center of the rotating shaft (22), extends radially along the rotating shaft (22), and is connected at one end to the oil inlet channel (311) and at the other end to the first oil delivery channel (330).

7. The motor according to claim 6, characterized in that, In the rotating shaft (22), multiple oil distribution channels (312) are arranged at circumferential intervals along the oil inlet channel (311).

8. The motor according to any one of claims 1 to 7, characterized in that, The second oil delivery channel (334) passes through both ends of the rotor core (21); One end of the second oil channel (334) is the oil inlet (332), and the other end is the second oil outlet (333). The oil inlet (332) and the second oil outlet (333) are located on the two end faces of the rotor core (21), respectively. The end plate is provided with an oil outlet hole (322) that runs through both sides of the end plate. One end of the oil outlet hole (322) is connected to the second oil outlet (333), and the other end is open towards the stator assembly (1).

9. The motor according to claim 8, characterized in that, On one side end face of the rotor core (21), a plurality of oil inlets (332) and a plurality of second oil outlets (333) are arranged circumferentially around the rotating shaft (22); On the other end face of the rotor core (21), a plurality of oil inlets (332) and a plurality of second oil outlets (333) are arranged circumferentially around the rotating shaft (22).

10. The motor according to claim 8, characterized in that, The inner wall of the oil outlet (322) includes: The first inclined surface (3221) is connected at one end to the second oil outlet (333), and the other end extends into the oil outlet (322) and extends toward the stator assembly (1); The first flat surface (3222) is located on the opposite side of the first inclined surface (3221) and is parallel to the central axis of the rotating shaft (22); The second inclined surface (3223) is connected at one end to the first flat surface (3222) and at the other end to the side of the end plate away from the rotor core (21), and is closer to the stator assembly (1) than the first flat surface (3222). The second flat surface (3224) is located on the opposite side of the second inclined surface (3223) and is connected to the first inclined surface (3221).

Images