Driving motor comprising carbon fiber rotor, power assembly and electric vehicle

Abstract

The invention provides a driving motor comprising a carbon fiber rotor, a power assembly and an electric vehicle. The driving motor comprises a stator and a carbon fiber rotor, the carbon fiber rotor comprises a rotor iron core, a rotor end plate, a fixing piece and a carbon fiber sleeve, and the rotor end plate is arranged between the rotor iron core and the fixing piece in the axial direction of the driving motor. One fixing piece is used for limiting the axial displacement of one rotor end plate relative to the rotor iron core, one side, facing one rotor iron core, of one rotor end plate comprises an annular protrusion, and one annular protrusion is used for abutting against the end face, facing one rotor end plate, of one rotor iron core; a carbon fiber sleeve is used for winding the outer circumferential surface of a rotor core and the outer circumferential surface of an annular protrusion. The carbon fibers of the driving motor cannot be embedded into the rotor to influence the rotor structure, and the performance of the driving motor is improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a drive motor, a powertrain and an electric vehicle including a carbon fiber rotor. Background Art

[0002] With the development of new energy vehicles, the motors in the powertrain of electric vehicles are developing towards high speed, high density and miniaturization. The motor consists of a rotor and a stator. The stator generates a magnetic field to drive the rotor to rotate and output power.

[0003] For motors including carbon fiber sleeves, if the carbon fiber is embedded in the rotor during the winding process, it will affect the safety of the rotor and the performance of the motor. In the existing carbon fiber rotor, the two ends of the rotor core are fixed by end plates. If there is a gap between the end plate and the rotor core, the carbon fiber will enter the gap and affect the performance of the motor. Summary of the invention

[0004] The present application provides a drive motor, a powertrain and an electric vehicle including a carbon fiber rotor. The carbon fiber of the drive motor will not be embedded in the rotor to affect the rotor structure, which is beneficial to improving the performance of the drive motor.

[0005] In a first aspect, an embodiment of the present application provides a drive motor including a carbon fiber rotor. The drive motor includes a stator and a carbon fiber rotor, the center hole of the stator is used to accommodate the carbon fiber rotor, the carbon fiber rotor includes a rotor core, a rotor end plate, a fixing member and a carbon fiber sleeve, a rotor end plate is arranged between a rotor core and a fixing member along the axial direction of the drive motor, a fixing member is used to limit the axial displacement of a rotor end plate relative to the rotor core, wherein: a rotor end plate includes an annular protrusion on one side facing a rotor core, an annular protrusion is used to abut against the end face of a rotor core facing a rotor end plate, and a carbon fiber sleeve is used to wrap around the outer peripheral surface of a rotor core and the outer peripheral surface of an annular protrusion.

[0006] In the drive motor provided by the embodiment of the present application, the rotor end plate is arranged adjacent to the rotor core along the axial direction of the drive motor, the annular protrusion abuts against the axial end face of the rotor core, and the space enclosed by the annular protrusion is used to keep the center position of the rotor end plate spaced from the rotor core. The center position of the rotor end plate is pressed against the rotor core by the fixing member, and the annular protrusion maintains contact with the rotor core to prevent the formation of a gap between the rotor end plate and the rotor core that is connected to the outer periphery of the rotor. In the process of winding the carbon fiber onto the outer peripheral surface of the rotor core to form a carbon fiber sleeve, the carbon fiber will not be embedded in the above-mentioned gap and enter the interior of the rotor, thereby ensuring the structural safety of the rotor and facilitating the improvement of the performance of the drive motor.

[0007] In one embodiment, along the radial direction of the drive motor, the outer diameter of the annular protrusion is less than or equal to the outer diameter of a rotor core. The rotor end plate is arranged at one end of the rotor core, and the outer peripheral surface of the annular protrusion is arranged adjacent to the outer peripheral surface of the rotor core for carbon fiber winding. In the process of winding carbon fiber from the outer peripheral surface of the rotor core to the annular protrusion to form a carbon fiber sleeve, no steps that affect the carbon fiber winding will appear, reducing the difficulty of winding. The outer diameter of the annular protrusion is equal to the outer diameter of the rotor core, and the outer peripheral surface of the annular protrusion and the outer peripheral surface of the rotor core maintain good continuity along the axial direction of the drive motor, which is convenient for carbon fiber winding molding.

[0008] In one embodiment, the drive motor further includes another fixing member and another rotor end plate. The other rotor end plate is arranged between another fixing member and one end of a rotor core away from one rotor end plate along the axial direction of the drive motor. The other fixing member is used to limit the axial displacement of one rotor end plate relative to the rotor core. The other rotor end plate includes another annular protrusion on one side facing the rotor core. The other annular protrusion is used to abut against the end face of one rotor core facing the other rotor end plate. A carbon fiber sleeve is also used to wrap around the outer peripheral surface of another annular protrusion. The two fixing members respectively press the two rotor end plates to the rotor core. The annular protrusion of each rotor end plate prevents a gap from being generated between the rotor core and the rotor end plates. In the process of the carbon fiber sleeve winding from the rotor core to the rotor end plates at both ends, the carbon fiber will not enter the inside of the rotor.

[0009] In one embodiment, along the radial direction of the drive motor, the inner diameter of an annular protrusion is greater than the outer diameter of a fixing member. The center of the rotor end plate is squeezed by the fixing member, and the contact area of ​​the fixing member on the rotor end plate is smaller than the area of ​​the space enclosed by the annular protrusion, thereby reducing the influence of the structural deformation caused by the force on the rotor end plate by the fixing member on the abutment between the annular protrusion and the rotor core.

[0010] In one embodiment, along the axial direction of the drive motor, an end surface of a rotor end plate facing away from a rotor core includes a central groove, and the central groove is used to accommodate a fixing member; along the radial direction of the drive motor, an inner diameter of an annular protrusion is larger than an outer diameter of a central groove. The central groove forms an annular boss on the side of the rotor end plate facing away from the annular protrusion, and the annular boss is opposite to the annular protrusion along the circumference of the drive motor, providing stable support for the annular protrusion to abut against the rotor core.

[0011] In one embodiment, along the axial direction of the drive motor, the distance between the bottom of a central groove and the end surface of a rotor end plate facing a rotor core is greater than the axial height of an annular protrusion protruding from a rotor end plate to ensure the structural strength of the rotor end plate.

[0012] In one embodiment, the outer diameter of a central groove facing the rotor core is smaller than the outer diameter of the central groove facing away from the rotor core. The area of ​​the mouth of the central groove is larger than the area of ​​the groove bottom, providing better pressing force for the annular protrusion to abut against the rotor core.

[0013] In one embodiment, along the axial direction of the drive motor, the distance between the bottom of a central groove and the end surface of a rotor end plate facing away from a rotor core is greater than the axial height of an annular protrusion protruding from a rotor end plate. The depth of the central groove is greater than the axial height of the reversing protrusion, providing a better pressing force for the annular protrusion to abut against the rotor core.

[0014] In one embodiment, a rotor end plate includes two adjacent sections along the axial direction of the drive motor, and the two sections have different outer diameters. The step formed between the two end structures of the rotor end plate is used to axially limit the carbon fiber sleeve.

[0015] In one embodiment, the rotor end plate includes a first structural segment and a second structural segment adjacent to each other along the axial direction of the drive motor, the first structural segment is adjacently arranged between a rotor core and the second structural segment, an annular protrusion is at least a part of the first structural segment, and the axial length of the second structural segment is greater than the axial height of the annular protrusion protruding from a rotor end plate, providing a greater pressing force for the annular protrusion. In the radial direction of the drive motor, the outer diameter of the second structural segment at one end facing the first circumferential surface is greater than the outer diameter of the first structural segment.

[0016] In one embodiment, along the radial direction of the drive motor, the outer diameter of the end of the second structure segment facing away from the first structure segment is smaller than the outer diameter of the end of the second structure segment facing the first structure segment to avoid the stator winding.

[0017] In one embodiment, the outer diameter of the end of the second structural segment facing away from the first structural segment is larger than the inner diameter of the annular protrusion, so as to maintain a continuous pressing force on the annular protrusion along the axial direction of the drive motor.

[0018] In one embodiment, along the axial direction of the drive motor, the distance between the second structural segment and a rotor core is smaller than the distance between a fixing member and a rotor core. The fixing member applies force to press the rotor end plate at the center of the rotor end plate, and the circumferential edge of the rotor end plate warps away from the rotor core. The different directions of the two forces cause the rotor end plate to bear a shear-like force, and the step between the first structural segment and the second structural segment is moved closer to the rotor core relative to the fixing member, thereby weakening the shear effect and enhancing the pressing force of the annular protrusion on the rotor core.

[0019] In one embodiment, each rotor end plate includes a plurality of oil outlet holes, each oil outlet hole is connected to two end surfaces of the rotor end plate along the axial direction of the drive motor, and each oil outlet hole is used to spray the cooling oil in the rotor core out of the side of the rotor end plate away from one of the rotor cores; along the radial direction of the drive motor, the sum of the distance between each oil outlet hole and the axis of the rotor and the aperture of the oil outlet hole is smaller than the distance between the inner circumferential surface of the annular protrusion and the axis of the rotor, and the structure of the annular protrusion avoids the oil outlet hole.

[0020] In a second aspect, an embodiment of the present application provides a power assembly, which includes a reducer and any one of the drive motors provided in the first aspect, and the drive motor is transmission-connected to the reducer.

[0021] In a third aspect, an embodiment of the present application provides an electric vehicle, which includes wheels, a transmission mechanism, and the powertrain provided in the second aspect above, wherein the powertrain drives the wheels through the transmission mechanism.

[0022] For the technical effects achieved by the above-mentioned second and third aspects, please refer to the description of the technical effects achieved by the corresponding design schemes in the above-mentioned first aspect, and this application will not repeat them here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the structure of a powertrain provided in an embodiment of the present application;

[0025] Figure 3 A schematic cross-sectional structure diagram of a drive motor provided in an embodiment of the present application;

[0026] Figure 4a A schematic diagram of the structure of a carbon fiber rotor provided in an embodiment of the present application;

[0027] Figure 4b An exploded view of a carbon fiber rotor provided in an embodiment of the present application;

[0028] Figure 4c A schematic diagram of the cross-sectional structure of a carbon fiber rotor provided in an embodiment of the present application;

[0029] Figure 5a A schematic cross-sectional view of a portion of the structure of a carbon fiber rotor provided in an embodiment of the present application;

[0030] Figure 5b A schematic cross-sectional view of a portion of the structure of a carbon fiber rotor provided in an embodiment of the present application;

[0031] Figure 6A schematic cross-sectional view of a portion of the structure of a carbon fiber rotor provided in an embodiment of the present application;

[0032] Figure 7 A schematic cross-sectional view of a portion of the structure of a carbon fiber rotor provided in an embodiment of the present application;

[0033] Figure 8 A schematic cross-sectional view of a portion of the structure of a carbon fiber rotor provided in an embodiment of the present application;

[0034] Fig. 9 A schematic cross-sectional view of a portion of the structure of a carbon fiber rotor provided in an embodiment of the present application;

[0035] Fig.10 A schematic cross-sectional view of a portion of the structure of a carbon fiber rotor provided in an embodiment of the present application; Fig.11a A schematic structural diagram of a first end plate of a carbon fiber rotor provided in an embodiment of the present application;

[0036] Fig.11b A schematic structural diagram of a first end plate of a carbon fiber rotor provided in an embodiment of the present application;

[0037] Fig.11c A schematic cross-sectional structure diagram of a first end plate provided in an embodiment of the present application;

[0038] Fig.12 A schematic structural diagram of a second end plate of a carbon fiber rotor provided in an embodiment of the present application;

[0039] Fig.13 A schematic diagram of the cross-sectional structure of a carbon fiber rotor provided in an embodiment of the present application.

[0040] Reference numerals:

[0041] 1000-powertrain; 2000-transmission mechanism; 3000-wheel;

[0042] 100-motor; 200-motor controller; 300-reducer;

[0043] 10-rotor; 20-stator; 201-stator core; 202-stator winding; 30-housing;

[0044] 1- rotor shaft; 11- annular shoulder; 2- rotor core; 3- rotor end plate; 3a- first end plate; 3b- second end plate; 301- first structural section; 302- second structural section; 31- oil outlet hole; 32- annular protrusion; 33- center groove; 34- radial channel; 4- pressure ring; 5- carbon fiber sleeve;

[0045] b1-groove bottom; b2-groove wall; d01-axial channel; d02-radial channel; d1-oil cooling channel; k-center hole; j-space. DETAILED DESCRIPTION

[0046] In motors with carbon fiber sleeves, the end plates fixed at both ends of the rotor core are warped, which will cause gaps between the end plates and the rotor core. During the carbon fiber winding process, the carbon fiber is embedded in these gaps, which has an adverse effect on the performance of the rotor and also affects the performance of the motor.

[0047] Based on this, the embodiments of the present application provide a drive motor, a powertrain and an electric vehicle including a carbon fiber rotor, which prevents a gap from appearing between the rotor core and the rotor end plate, causing the carbon fiber to enter the gap, which is beneficial to ensuring the safety of the rotor and improving the efficiency of the motor.

[0048] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0049] Figure 1 A schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the electric vehicle is a wheeled device driven or towed by a power device, including a pure electric vehicle (pure electric vehicle / battery electric vehicle, pure EV / battery EV), a hybrid electric vehicle (hybrid electric vehicle, HEV), a range extended electric vehicle (range extended electric vehicle, REEV) or a plug-in hybrid electric vehicle (plug-in hybrid electric vehicle, PHEV), etc. The electric vehicle includes a powertrain 1000, a transmission mechanism 2000 and a wheel 3000. The powertrain 1000 drives the wheel 3000 through the transmission mechanism 2000. Among them, the powertrain 1000 is used to convert electrical energy into mechanical energy. The transmission mechanism 2000 is used to transmit and connect the powertrain 1000 and the wheel 3000. Of course, the electric vehicle also includes a frame that withstands the internal and external environmental loads of the vehicle and a battery for supplying power to the powertrain 1000.

[0050] Figure 2 This is a schematic diagram of the structure of the powertrain 1000 provided in the embodiment of the present application. Figure 2As shown, the powertrain 1000 includes a drive motor 100 and a motor controller 200. The motor controller 200 is used to convert the direct current provided by the battery into alternating current, and transmit the alternating current to the drive motor 100. In one embodiment, the powertrain 1000 also includes a reducer 300, and the power output end of the drive motor 100 is connected to the wheel 3000 of the electric vehicle through the reducer 300. The reducer 300 is also called a transmission. The drive motor 100 of the electric vehicle is usually a permanent magnet synchronous or AC asynchronous motor.

[0051] In one embodiment, the power assembly 1000 is a single-drive system, that is, the power assembly 1000 includes one drive motor 100 .

[0052] In one embodiment, the powertrain 1000 is a dual-drive system, that is, the powertrain 1000 includes two drive motors 100 .

[0053] In one embodiment, the powertrain 1000 is an all-in-one system, that is, the motor controller 200, the drive motor 100 and the reducer 300 are integrated together.

[0054] Figure 3 FIG. 1 is a schematic diagram of a cross-sectional structure of a driving motor 100. Figure 3 As shown, the driving motor 100 includes a rotor 10 and a stator 20 .

[0055] In one embodiment, the drive motor 100 further includes a housing 30, and a stator 20 and a portion of the rotor 10 are accommodated in the housing 30. One end of the rotor 10 is rotatably mounted on the housing 30, and the other end extends out of the housing 30 for transmission connection to the reducer 300. One end of the rotor 10 for transmission connection to the reducer 300 is a power output end S, which is also the power output end of the drive motor 100. The stator 20 is sleeved outside the rotor core 2, and the stator 20 includes a stator core 201 and a stator winding 202 wound on the stator core 201. When the stator winding 202 is energized, the stator core 201 generates a magnetic field to drive the rotor 10 to rotate to output power.

[0056] In the embodiment of the present application, the axial direction of the drive motor, the axial direction of the stator, and the axial direction of the rotor refer to the same direction, the circumferential direction of the drive motor, the circumferential direction of the stator, and the circumferential direction of the rotor refer to the same direction, and the radial direction of the drive motor, the radial direction of the stator, and the radial direction of the rotor refer to the same direction. For ease of understanding, the axial direction of the drive motor 100 is represented by the letter A, and the radial direction of the drive motor 100 is represented by the letter R.

[0057] In one embodiment, the rotor 10 included in the drive motor 100 is a carbon fiber rotor. Figure 4a and Figure 4bAs shown, the rotor 10 includes a rotor shaft 1, a rotor core 2, two rotor end plates 3, two fixings 4 and a carbon fiber sleeve 5. The rotor shaft 1 is also the motor shaft of the drive motor 100, and one end of the rotor shaft 1 is a power output end S, which is used for transmission connection to the reducer. The two rotor end plates 3 are arranged on both sides of the rotor core 2 along the axial direction of the drive motor. The rotor core 2 and the two rotor end plates 3 are fixed to the rotor shaft 1 by keyway matching. The two fixings 4 are respectively arranged on the side of the two rotor end plates 3 away from the rotor core 2 along the axial direction of the drive motor, and each fixing 4 is used to axially limit the rotor end plate 3 along the axial direction of the drive motor. The carbon fiber sleeve 5 is wrapped around the outer circumference of the rotor core 2 and a part of the outer circumference of the two rotor end plates 3 along the circumference of the drive motor. Among them, the carbon fiber sleeve 5 is formed by winding carbon fiber around the outer circumference of the rotor core 2 and the two rotor end plates 3.

[0058] In one embodiment, an oil cooling circuit for cooling oil flow is formed inside the rotor 10. The rotor 10 includes a plurality of liquid outlet holes 31 connected to the internal oil cooling circuit on both sides along the axial direction of the drive motor. The plurality of liquid outlet holes 31 are used to spray the cooling oil in the oil cooling circuit out to the side of the two rotor end plates 3 facing away from the rotor core 2, thereby achieving oil spraying at both ends of the rotor 10.

[0059] In one embodiment, a portion of the liquid outlet holes 31 are distributed on a side of one rotor end plate 3 away from the rotor core 2 , and a portion of the liquid outlet holes 31 are distributed on a side of another rotor end plate 3 away from the rotor core 2 .

[0060] For the convenience of description, Figure 4b As shown, of the two rotor end plates 3, the end plate 3 on the side close to the power output end S is set as the second end plate 3b, and the end plate 3 on the side away from the power output end S is set as the first end plate 3a. The two fixing members 4 are used to limit and fix the rotor core 2 and the first end plate 3a and the second end plate 3b along the axial direction of the oil-cooled motor. One of the fixing members 4 is the first fixing member 4a, which is arranged on the side of the first end plate 3a away from the rotor core 2 along the axial direction of the oil-cooled motor. The other fixing member 4 is the second fixing member 4b, which is arranged on the side of the second end plate 3b away from the rotor core 2 along the axial direction of the oil-cooled motor.

[0061] In one embodiment, the first fixing member 4a is an annular structure member, and the annular structure member is used to be fitted on the rotor shaft 1 through friction force to achieve fixation.

[0062] In one embodiment, the second fixing member 4b is a part of the rotor shaft 1. In one embodiment, the second fixing member 4b and the rotor shaft 1 are an integral structure. In one embodiment, the second fixing member 4b is an annular shoulder protruding from the outer circumference of the rotor shaft 1.

[0063] Figure 4c FIG. 2 shows a schematic cross-sectional structure diagram of the rotor 10. Figure 4c As shown, the rotor core 2 and the two rotor end plates 3 are assembled on the rotor shaft 1, and the first end plate 3a and the second end plate 3b of the end plate press the two axial end faces of the rotor core 2 toward each other through the first fixing member 4a and the second fixing member 4b respectively. The carbon fiber sleeve 5 is wrapped around the outer peripheral surface of the rotor core 2 to protect the rotor core 2. The second end plate 3b, the rotor core 2, and the first end plate 3a are sleeved on the outer peripheral surface of the rotor shaft 1 along the axial direction of the motor, and the rotor shaft 1 is circumferentially fixed to the rotor core 2 and each rotor end plate 3 respectively through keyway matching. After the rotor core 2 and the two rotor end plates 3 are assembled, the side of the second end plate 3b away from the multiple rotor punchings 21 abuts against the second fixing member 4b of the rotor shaft 1. The first fixing member 4a is inserted into the rotor shaft 1 along the axial direction of the driving motor and is away from the power output end S. The first fixing member 4a is pressed and fixed to the side of the first end plate 3a away from the multiple rotor punchings 21. The first fixing member 4a and the second fixing member 4b provide axial limitation for the multiple stator punchings 21 and the two end plates 3 along the axial direction of the motor.

[0064] like Figure 4c As shown, carbon fiber is wound around the outer circumference of the rotor core 2 to form a carbon fiber sleeve 5. Along the axial direction of the drive motor, the two ends of the carbon fiber sleeve 5 extend out of the two ends of the rotor core 2 and partially extend to the outer circumference of the first end plate 3a and the outer circumference of the second end plate 3b. In order to axially fix the rotor core 2 and the first end plate 3a and the second end plate 3b, the first fixing member 4a and the second fixing member 4b apply force toward each other along the axial direction of the drive motor to press the first end plate 3a and the second end plate 3b to the two ends of the rotor core 2.

[0065] like Figure 4cAs shown by the solid arrow, the first fixing member 4a applies a force to the first end plate 3a in the axial direction of the drive motor to approach the rotor core 2. The force on the first end plate 3a in the radial direction of the drive motor is unbalanced, so that the circumferential edge of the first end plate 3a moves away from the rotor core 2 in the axial direction of the drive motor, as shown by the dotted arrow. The middle part of the first end plate 3a is close to the rotor core 2, and the circumferential edge is far away from the rotor core 2. The circumferential edge of the first end plate 3a is deformed and warped, resulting in a gap between the circumferential edge of the first end plate 3a and the rotor core 2, and the gap is connected to the outer peripheral space of the rotor 10. Similarly, the second fixing member 4b is pressed against by the second end plate 3b and applies a reaction force to the second end plate 3b in the reverse direction to approach the rotor core 2. The force on the second end plate 3b in the radial direction of the drive motor is unbalanced, so that the circumferential edge of the second end plate 3b moves away from the rotor core 2 in the axial direction of the drive motor, as shown by the dotted arrow. The middle part of the second end plate 3b is close to the rotor core 2, and the circumferential edge part is far away from the rotor core 2. The circumferential edge of the second end plate 3b is deformed and warped, resulting in a gap between the circumferential edge part of the second end plate 3b and the rotor core 2, and the gap is connected to the peripheral space of the rotor 10.

[0066] If a gap is formed between any rotor end plate 3 and the rotor core 2 that is connected to the outer peripheral space of the rotor 10, the carbon fibers of the carbon fiber sleeve 5 will be embedded in the gap during the winding process, which will have an adverse effect on the structure of the rotor 10, and further affect the performance of the drive motor 100. One of the two rotor end plates 3 includes an annular protrusion 32 on the side facing the rotor core 2, and the annular protrusion 32 is used to abut the end surface of the rotor core 2 facing the rotor end plate 3, and the carbon fiber sleeve 5 is used to wind the outer peripheral surface of the rotor core 2 and the outer peripheral surface of the annular protrusion 32. Due to the presence of the annular protrusion 32, a space j is formed between the end surface of the rotor end plate 3 facing the rotor core 2, the inner peripheral surface of the annular protrusion 32, and the axial end surface of the rotor core 2, and the end surface of the rotor end plate 3 corresponding to the space j remains non-contact with the rotor core 2 when no force is applied.

[0067] like Figure 5b As shown, the fixing member 4 limits the rotor end plate 3 along the axial direction of the driving motor, and the fixing member 4 applies force to the rotor end plate 3, so that the structure of the rotor end plate 3 corresponding to the space j is deformed and approaches the rotor core 2 as shown by the dotted line. The above-mentioned space j is used to accommodate the structural deformation of the rotor end plate 3, so as to prevent the structural deformation of the rotor end plate 3 from causing deformation and warping in the direction away from the rotor core 2 as shown by the dotted arrow, and a gap is formed between the outer periphery of the rotor end plate 3 and the outer periphery of the rotor core 2. In the process of winding carbon fiber around the outer periphery of the rotor core 2 to form the carbon fiber sleeve 5, the carbon fiber will not be embedded between the rotor end plate 3 and the rotor core 2 to affect the performance of the rotor 10.

[0068] In one embodiment, the fixing member 4 is mounted on the rotor shaft 1 to limit the axial displacement of the rotor end plate 3 relative to the rotor core 2. In one embodiment, the space enclosed by the inner circumference of the annular protrusion 32 is the area where the center position of the rotor end plate 3 is located. The fixing member 4 presses the rotor end plate 3 along the axial direction of the drive motor, and the fixing member 4 acts on the center position of the rotor end plate 3. The annular protrusion 32 of the rotor end plate 3 surrounds the center position where the fixing member 4 acts. The center position of the rotor end plate 3 is approached to the rotor core 2 by the force of the fixing member 4, and the above-mentioned space j accommodates the structural deformation of the rotor end plate 3 to prevent the edge position of the rotor end plate 3 from deforming and warping in the direction away from the rotor core 2 and forming a gap.

[0069] In one embodiment, Figure 6 As shown, along the axial direction of the driving motor, the axial height h1 of the annular protrusion 32 protruding from the rotor end plate 3 is smaller than the distance h2 between the bottom of the annular protrusion 32 and the end surface of the rotor end plate 3 facing away from the rotor core 2, and the axial height h1 of the annular protrusion 32 protruding from the rotor end plate 3 is the axial length of the space.

[0070] In one embodiment, along the axial direction of the drive motor, the axial height h1 of the annular protrusion 32 protruding from the first end plate 3a is 0.15mm-0.2mm. The structure of the annular protrusion 32 will not affect the assembly between the overall structure of the rotor end plate 3 and the rotor core 2, and the annular protrusion 32 plays a role of fine-tuning during assembly.

[0071] In one embodiment, Figure 6 As shown, the inner diameter R12 of the annular protrusion 32 is greater than the outer diameter R4 of the above-mentioned fixing member 4. With the axis Q of the rotor 10 as a reference, the distance from the inner circumference of the annular protrusion 32 to the axis Q along the radial direction of the driving motor is the inner diameter R12 of the annular protrusion 32, and the distance from the outer circumference of the fixing member 4 to the axis Q along the radial direction of the driving motor is the outer diameter R4 of the fixing member 4. The contact area between the fixing member 4 and the rotor end plate 3 is smaller than the area of ​​the space enclosed by the annular protrusion 32, which reduces the influence of the structural deformation caused by the force of the fixing member 4 on the rotor end plate 3 on the abutment between the annular protrusion 32 and the rotor core 2.

[0072] It should be understood that in the actual structure of the rotor 10, the structural deformation of the rotor end plate 3 caused by the pressing force of the fixing member 4 along the axial direction of the driving motor is small, and the space j enclosed between the rotor end plate 3 and the rotor core 2 is also small. Figure 5a , Figure 5b as well as Figure 6 The structural diagram in the figure magnifies the relative positions and connection relationships between the various structures, so as to facilitate understanding that the annular protrusion 32 of the rotor end plate 3 abuts against the rotor core 2 to avoid the generation of gaps between the rotor end plate 3 and the rotor core 2 that may cause carbon fiber embedding.

[0073] Please continue to refer to Figure 6 As shown, when carbon fiber is wound around the rotor core 2 to form a carbon fiber sleeve 5, the carbon fiber sleeve 5 is used to wind the outer circumference of the rotor core 2 and at least a portion of the outer circumference of the annular protrusion 32. In the process of carbon fiber winding around the rotor core 2, it is wound from one side of the rotor core 2 to the side of the rotor end plate 3. If a step appears between the rotor end plate 3 and the rotor core 2 due to the mismatch of radial dimensions, it will affect the winding preparation of the carbon fiber. Based on this, along the radial direction of the drive motor, the outer diameter R11 of the annular protrusion 32 is configured to be less than or equal to the outer diameter R0 of the rotor core 2. Among them, taking the axis Q of the rotor 10 as a reference, the distance from the outer circumference of the annular protrusion 32 to the axis Q along the radial direction of the drive motor is the outer diameter R11 of the annular protrusion 32, and the distance from the outer circumference of the rotor core 2 to the axis Q along the radial direction of the drive motor is the outer diameter R0 of the rotor core 2.

[0074] In one embodiment, combining Figure 6 As shown, along the radial direction of the driving motor, the outer diameter R11 of the annular protrusion 32 is configured to be equal to the outer diameter R0 of the rotor core 2, the annular protrusion 32 and the rotor core 2 are arranged adjacent to each other along the axial direction of the driving motor, one end of the annular protrusion 32 facing the rotor core 2 abuts against the rotor core 2, and the outer peripheral surface of the annular protrusion 32 is adjacent to the outer peripheral surface of the rotor core 2 along the axial direction of the driving motor and remains relatively continuous. In the process of carbon fiber winding from the rotor core 2 to the annular protrusion 32, the reference surface of the carbon fiber winding remains relatively continuous, which improves the carbon fiber winding efficiency, and the structure of the carbon fiber sleeve 5 formed by the carbon fiber winding will also be flatter, and the combination of the carbon fiber sleeve 5 and the rotor core 2 will be more reliable.

[0075] In one embodiment, combining Figure 6 As shown, along the radial direction of the drive motor, the difference between the outer diameter R11 and the inner diameter R12 of the annular protrusion 32 is 0.15mm-0.2mm, that is, the wall thickness of the annular protrusion 32 is 0.15mm-0.2mm. The structure of the annular protrusion 32 will not affect the assembly between the overall structure of the first end plate 3a and the rotor core 2, and the annular protrusion 32 plays a role of fine adjustment in the assembly.

[0076] In some embodiments, the structure of the rotor end plate 3 is divided into two sections along the axial direction of the drive motor, and the outer diameters of the two sections are different, so that a step is formed on the outer peripheral surface of the rotor end plate 3. The step on the outer peripheral surface of the rotor end plate 3 is used to axially limit the carbon fiber sleeve 5 to prevent the carbon fiber sleeve 5 from escaping from the rotor end plate 3 along the axial direction of the drive motor.

[0077] In one embodiment, Figure 7As shown, the rotor end plate 3 includes a first structural segment 301 and a second structural segment 302, and the second structural segment 302 is arranged adjacent to the first structural segment 301 along the axial direction of the drive motor. Of course, the first end plate 3a is an integrated structure, and the structural division of the first structural segment 301 and the second structural segment 302 is only for convenience of description. Figure 6 The first structural segment 301 and the second structural segment 302 are divided by a dotted line. The first structural segment 301 of the rotor end plate 3 faces the rotor core 2, and the annular protrusion 32 is located on the end surface of the first structural segment 301 away from the second structural segment 302. Along the axial direction of the drive motor, the axial height of the annular protrusion 32 protruding from the rotor end plate 3 is less than the axial length of the first structural segment 301, and the outer peripheral surface of the annular protrusion 32 is at least a part of the outer peripheral surface of the first structural segment 301. Along the radial direction of the drive motor, the outer diameter of the first structural segment 301 is less than the outer diameter of the second structural segment 302, and an annular step surrounding the rotor end plate 3 is formed between the first structural segment 301 and the second structural segment 302. In some embodiments, the outer peripheral surface of the first structural segment 301 and the outer peripheral surface of the second structural segment 302 are not continuous, and the outer diameter of the end of the second structural segment 302 facing the first structural segment 301 is configured to be larger than the outer diameter of the end of the first structural segment 301 facing the second structural segment 302, so as to form a step between the first structural segment 301 and the second structural segment 302.

[0078] Please continue to refer to Figure 6 As shown, the first structural segment 301 faces the rotor core 2, and the annular protrusion 32 included in the end surface of the first structural segment 301 facing the rotor core 2 abuts against the rotor core 2, and the outer peripheral surface of the annular protrusion 32 is a part of the outer peripheral surface of the first structural segment 301. In one embodiment, along the radial direction of the drive motor, the outer diameter R21 of the first structural segment 301 is configured to be less than or equal to the outer diameter R0 of the rotor core 2, and in the process of winding carbon fiber to form the carbon fiber sleeve 5, the carbon fiber is wound to the outer peripheral surface of the first structural segment 301. Along the radial direction of the drive motor, the outer diameter R22 of the second structural segment 302 is configured to be greater than the outer diameter R0 of the rotor core 2, and the step between the second structural segment 302 and the first structural segment 301 axially limits the carbon fiber sleeve 5 to prevent the carbon fiber sleeve 5 from slipping out of the rotor end plate 3 along the axial direction of the drive motor.

[0079] In one embodiment, the outer diameter R22 of the second structural segment 302 is less than or equal to the outer diameter R5 of the carbon fiber sleeve 5, and the second structural segment 302 axially limits the carbon fiber sleeve 5, but does not increase the outer diameter of the rotor 10. The rotor end plate 3 is located at the end winding of the stator 20, and the second structural segment 302 with a smaller radial size is used to avoid the end winding of the stator 20, ensure the safety distance, and avoid electrical conduction between the rotor end plate 3 and the winding of the stator 20, which affects the safe operation of the motor.

[0080] In one embodiment, along the axial direction of the drive motor, the axial length of the second structural segment 302 is greater than the axial length of the first structural segment 301, and the first structural segment 301 includes an annular protrusion 32 at one end facing the rotor core 2, and the second structural segment 302 provides a clamping force for the annular protrusion 32 to ensure that no gap appears between the rotor end plate 3 and the rotor core 2.

[0081] In order to further avoid the end windings of the stator 20 in the drive motor 100, as shown in FIG. Figure 8 As shown, the radial dimension of the outer peripheral surface of the second structural segment 302 of the rotor end plate 3 changes along the axial direction of the drive motor, so that the outer diameter R221 of the end of the second structural segment 302 facing the first structural segment 301 is greater than the outer diameter R222 of the end of the second structural segment 302 facing away from the first structural segment 301. The second structural segment 302 of the rotor end plate 3 is used to avoid the end winding of the stator 20, so that a sufficient safety distance is maintained between the rotor 10 and the stator 20 in the radial direction of the drive motor.

[0082] In one embodiment, the outer peripheral surface of the second structural segment 302 of the rotor end plate 3 is inclined so that the outer diameter of the second structural segment 302 decreases along the direction of the rotor core 2 pointing to the first end plate 3a.

[0083] In one embodiment, an angle β is formed between the outer circumference of the second structural segment 302 and the axial direction of the drive motor, and the angle β is in the range of 5°-10°. During the rotation of the rotor 10, the external airflow acts on the outer circumference of the second structural segment 302 to generate a component force pointing to the rotor core 2 along the axial direction of the drive motor, which also helps to maintain the contact between the rotor end plate 3 and the rotor core 2, and avoid the appearance of a gap between the rotor end plate 3 and the rotor core 2 where the carbon fiber is embedded.

[0084] Please refer to the overall structure of the rotor 10. Fig. 9 As shown, the outer diameter R221 of one end of the second structural segment 302 facing the first structural segment 301 is the maximum outer diameter of the rotor end plate 3, and the outer diameter R221 is larger than the outer diameter R0 of the rotor core 2 to axially limit the carbon fiber sleeve 5, and the outer diameter R221 is smaller than or equal to the outer diameter of the carbon fiber sleeve 5 so as not to increase the outer circumferential size of the rotor 10.

[0085] In some embodiments, the outer diameter R222 of the end of the second structural segment 302 away from the first structural segment 301 is greater than or equal to the inner diameter R12 of the annular protrusion 32, so that the second structural segment 302 maintains sufficient structural strength. Even if the rotor end plate 3 is compressed and deformed by the fixing member 4, the structure of the second structural segment 302 provides continuous support for the annular protrusion 32 along the axial direction of the drive motor, which helps the annular protrusion 32 to abut against the rotor core 2 and prevent a gap from appearing between the rotor end plate 3 and the rotor core 2.

[0086] In some embodiments, such as Fig.10 A rotor end plate 3 is shown, and the end surface of the rotor end plate 3 facing away from the rotor core 2 includes a central groove 33 , and the central groove 33 is used to accommodate the fixing member 4 .

[0087] In the drive motor provided in the embodiment of the present application, the rotor end plate 3 includes a first structural segment 301 and a second structural segment 302, the central groove 33 is located in the second structural segment 302, and the mouth of the central groove 33 is located at the end surface of the second structural segment 302 away from the first structural segment 301. In one embodiment, the central groove 33 is formed by the end surface of the second structural segment 302 being recessed in the direction of the first structural segment 301 along the axial direction of the drive motor.

[0088] In one embodiment, the central groove 33 includes a groove bottom b1 located at the center of the rotor end plate 3 and a groove wall b2 surrounding the outer periphery of the groove bottom b1 , and the groove wall b2 surrounds the rotor shaft 1 .

[0089] The rotor end plate 3 is mounted at one end of the rotor core 2, and the central groove 33 is used to accommodate the fixing member 4. The thickness of the rotor end plate 3 at the central groove 33 needs to meet the strength requirement of the force applied by the fixing member 4 to the rotor end plate 3, and the groove depth of the central groove 33 needs to meet the requirement of at least partially accommodating the fixing member 4. In one embodiment, the groove depth of the central groove 33 is the distance between the groove bottom b1 along the axial direction of the drive motor and the end surface of the rotor end plate 3 away from the rotor core 2.

[0090] In the drive motor provided by the embodiment of the present application, the structure between the groove wall b2 of the central groove 33 and the outer peripheral surface of the second structural section 302 is equivalent to an annular boss of the rotor end plate 3. Along the axial direction of the drive motor, the annular protrusion 32 is separated from the boss.

[0091] Along the axial direction of the driving motor, the groove depth of the central groove 33 is greater than the axial height of the annular protrusion 32 protruding from the first structural segment 301, and the axial distance between the groove bottom b1 of the central groove 33 and the end surface of the first structural segment 301 away from the second structural segment 302 is greater than the axial height of the annular protrusion 32 protruding from the first structural segment 301. The first end plate 3a is arranged at one end of the rotor core 2, the groove bottom b1 of the central groove 33 is squeezed by the fixing member 4, and the structure between the groove wall b2 of the central groove 33 and the outer peripheral surface of the second structural segment 302 provides stable support for the annular protrusion 32 to abut against the rotor core 2.

[0092] In some embodiments, the groove wall b2 of the central groove 33 is an inclined surface. Along the axial direction of the driving motor, the groove wall b2 of the central groove 33 is set at an angle with the axial direction of the driving motor, so that the area of ​​the mouth of the central groove 33 is larger than the area of ​​the groove bottom b1, and the cross section of the boss between the groove wall b2 of the central groove 33 and the outer peripheral surface of the second structural section 302 is similar to a trapezoid, which is conducive to enhancing the structural strength of the first end plate 3a and providing better support for the annular protrusion 32 to abut against the rotor core 2.

[0093] like Fig. 9 As shown, the annular protrusion 32 of the rotor end plate 3 abuts against an axial end face of the rotor core 2. The fixing member 4 is assembled on the side of the rotor end plate 3 away from the rotor core 2, and the fixing member 4 is accommodated in the central groove 33 of the first end plate 3a. Along the radial direction of the drive motor, the central groove 33 of the first end plate 3a is in a truncated cone shape, and the outer diameter R24 ​​of the central groove 33 at one end facing the rotor core 2 is smaller than the outer diameter R23 of the central groove 33 at one end away from the rotor core 2. The outer diameter R4 of the fixing member 4 is smaller than the outer diameter R24, and the inner diameter R12 of the annular protrusion 32 is larger than the outer diameter R23. The volume of the annular boss formed between the central groove 33 and the outer peripheral surface of the rotor end plate 3 is large enough to provide better support for the annular protrusion 32, and the fixing member 4 presses the rotor end plate 3 to provide a pressing force for the annular protrusion 32.

[0094] In one embodiment, along the axial direction of the driving motor, the fixing member 4 is partially accommodated in the central groove 33 and partially protrudes from the central groove 33. In some embodiments, please continue to refer to Fig. 9 As shown, the distance h31 between the second structural segment 302 and the rotor core 2 is smaller than the distance between the fixing member 4 and the rotor core 2. In the embodiment of the present application, the distance h31 between the second structural segment 302 and the rotor core 2 is the axial length of the first structural segment 301, and the distance h31 between the fixing member 4 and the rotor core 2 is the axial distance between the bottom of the central groove 33 and the rotor core 2.

[0095] The fixing member 4 presses the rotor end plate 3 toward the rotor core 2. The circumferential edge of the rotor end plate 3 is equivalent to being subjected to a reaction force away from the rotor core 2. The force at the center of the rotor end plate 3 is different from the force at the axial edge, and a shear-like force is formed inside the rotor end plate 3. The step between the first structural segment 301 and the second structural segment 302 is moved closer to the rotor core 2 relative to the fixing member 4, so as to weaken the shear force effect inside the rotor end plate 3 and enhance the clamping force.

[0096] In some embodiments, the rotor 10 is cooled by oil cooling, such as Fig.10 As shown, the rotor end plate 3 includes a plurality of oil outlet holes 31 for discharging cooling oil from the inside of the rotor 10 , and each oil outlet hole 31 is connected to two axial end surfaces of the rotor end plate 3 .

[0097] In one embodiment, each oil outlet hole 31 penetrates the rotor end plate 3 along the axial direction of the drive motor and communicates with the groove bottom b1 of the central groove 33. Each oil outlet hole 31 is arranged between the rotor shaft 1 and the groove wall b2 of the central groove 33 along the radial direction of the drive motor.

[0098] In one embodiment, Fig.10 As shown, each oil outlet hole 31 is arranged between the inner circumference of the annular protrusion 32 and the rotor shaft 1 along the radial direction of the drive motor. Along the radial direction of the drive motor, the distance R12 between the inner circumference of the annular protrusion 32 and the axis of the rotor 10 is greater than the sum R3 of the distance between the oil outlet hole 31 and the axis of the rotor 10 and the diameter of the oil outlet hole 31. The annular protrusion 32 and the oil outlet hole 31 avoid each other along the radial structure of the drive motor, and will not affect the oil path connection of the oil outlet hole 31.

[0099] In one embodiment, Fig.10 As shown, the distance between the outer diameter R4 of the fixing member 4 and the outer diameter R24 ​​of the end of the central groove 33 facing the rotor core 2 needs to be sufficient to arrange the oil outlet holes 31 of the rotor end plate 3 to prevent the pressure ring 4 from affecting the oil outlet holes 31 from spraying oil. In the radial direction of the drive motor, the outer diameter R4 of the fixing member 4 is less than or equal to the distance between each oil outlet hole 31 and the axis Q of the rotor 10, and the fixing member 4 avoids the oil outlet holes 31.

[0100] In one embodiment, the two rotor end plates 3 of the rotor 10 provided in the embodiment of the present application are both the above-mentioned rotor end plates 3 including the annular protrusion 32. The two rotor end plates 3 are pressed against the rotor core 2 along the axial direction of the drive motor to avoid the formation of a gap connected to the outer periphery of the rotor 10, so as to prevent the carbon fibers of the carbon fiber sleeve 5 from being embedded in the rotor 10.

[0101] In one embodiment, Fig.11a The two rotor end plates 3 of the rotor 10 include a first end plate 3a, the first end plate 3a includes a center hole k for the rotor shaft 1 to pass through, and the center hole k passes through the first end plate 3a along the axial direction of the drive motor. The first end plate 3a includes a plurality of oil outlet holes 31, and each oil outlet hole 31 is connected to the two axial end faces of the first end plate 3a. In one embodiment, each oil outlet hole 31 passes through the first end plate 3a along the axial direction of the drive motor, and the plurality of oil outlet holes 31 are arranged at intervals along the circumferential direction of the drive motor. In one embodiment, the plurality of oil outlet holes 31 are arranged at intervals around the center hole k, and the shape of the oil outlet holes 31 is circular.

[0102] In one embodiment, Fig.11aThe end face of the first end plate 3a shown is the end face of the first end plate 3a facing the rotor core 2. The end of the first end plate 3a facing the rotor core 2 includes an annular protrusion 32, and the annular protrusion 32 protrudes from the end face of the first end plate 3a along the axial direction of the drive motor. The annular protrusion 32 surrounds the center hole k along the circumference of the drive motor, and each of the above-mentioned oil outlet holes 31 is arranged between the inner circumferential surface of the annular protrusion 32 and the center hole k along the radial direction of the drive motor. Along the radial direction of the drive motor, the distance between the inner circumferential surface of the annular protrusion 32 and the center hole k is greater than the sum of the distance between the opening of the oil outlet hole 31 at the end face and the center hole k and the aperture of the oil outlet hole 31. The annular protrusion 32 and the oil outlet hole 31 avoid each other along the radial structure of the drive motor, and will not affect the oil path connection of the oil outlet hole 31.

[0103] In one embodiment, the outer circumference of the annular protrusion 32 is a part of the outer circumference of the first end plate 3a. In one embodiment, the end surface of the first end plate 3a includes a groove, and the structure formed between the side wall of the groove and the outer circumference of the first end plate 3a is the annular protrusion 32.

[0104] In one embodiment, the annular protrusion 32 is continuous and uninterrupted along the outer circumference of the first end plate 3a.

[0105] In one embodiment, the first end plate 3 a includes a first structural segment 301 and a second structural segment 302 , and the second structural segment 302 and the first structural segment 301 are arranged adjacent to each other along the axial direction of the driving motor.

[0106] like Fig.11b The other end surface of the first end plate 3 a shown, the end surface of the first end plate 3 a facing away from the rotor core 2 includes a central groove 33 , and the central groove 33 is used to accommodate the above-mentioned first fixing member 4 a.

[0107] Fig.11c The cross-sectional structure of the first end plate 3a is shown. The structure between the groove wall b2 of the center groove 33 and the outer peripheral surface of the second structural segment 302 is equivalent to an annular boss of the first end plate 3a, and the center groove 33 is in the shape of a truncated cone. For ease of understanding, the cross section of the boss is shown in shadow. Along the axial direction of the drive motor, the annular protrusion 32 and the annular convexity formed between the groove wall b2 of the center groove 33 and the outer peripheral surface of the second structural segment 302 are separated from each other, and the structure between the groove wall b2 of the center groove 33 and the outer peripheral surface of the second structural segment 302 provides stable support for the annular protrusion 32 to abut against the rotor core 2. The cross section of the boss between the groove wall b2 of the center groove 33 and the outer peripheral surface of the second structural segment 302 is similar to a trapezoid, which is conducive to enhancing the structural strength of the first end plate 3a and providing better support for the annular protrusion 32 to abut against the rotor core 2.

[0108] In one embodiment, Fig.12 The structure of the second end plate 3b of the two rotor end plates 3 of the rotor 10. Fig.12 As shown, the second end plate 3b has a similar structure to the first end plate 3a, and also includes a first structural segment 301 and a second structural segment 302, and a step of the axially limiting carbon fiber sleeve 5 is formed between the first structural segment 301 and the second structural segment 302. The second end plate 3b includes an annular protrusion 32 at one end facing the rotor core 2, and the annular protrusion 32 protrudes from the surface of the second end plate 3b facing the rotor core 2. The annular protrusion 32 is used to abut against the other axial end surface of the rotor core 2 away from the first end plate 3a. Compared with the first end plate 3a, the second end plate 3b is different in that the second end plate 3b includes a plurality of radial channels 34, which are arranged at intervals along the circumference of the drive motor, and each radial channel 34 connects the center hole k of the second end plate 3b with an oil outlet hole 31 along the radial direction of the drive motor, and the plurality of radial channels 34 are used to transmit cooling oil to the inside of the rotor core 2.

[0109] It should be understood that when Fig.12 The second end plate 3b shown is assembled at the other axial end face of the rotor core 2. Under the force applied by the second fixing member 4b of the rotor shaft 1, the space enclosed by the annular protrusion 32 is used to accommodate the structural deformation of the center position of the second end plate 3b. The annular protrusion 32 always abuts against the axial end face of the rotor core 2. The annular protrusion 32 abuts against the rotor core 2 so that no gap connecting to the outer periphery of the rotor 10 appears between the second end plate 3b and the rotor core 2, thereby preventing the carbon fibers of the carbon fiber sleeve 5 from entering between the second end plate 3b and the rotor core 2 and affecting the safety of the rotor 10.

[0110] like Fig.13 In the cross-sectional structure of a rotor 10 illustrated in the example, the rotor shaft 1 includes an oil inlet channel formed by an axial flow channel d01 and a plurality of radial flow channels d02 , and the oil inlet channel is used to supply oil to the inside of the rotor core 2 .

[0111] In one embodiment, the axial flow channel d01 of the rotor shaft penetrates the rotor shaft 1 along the axial direction of the drive motor, and a plurality of radial flow channels d02 are arranged at intervals along the circumferential direction of the drive motor, and each radial flow channel d02 connects the outer peripheral surface of the rotor shaft 1 and the axial flow channel d01 along the radial direction of the drive motor. Along the radial direction of the drive motor, each radial flow channel d02 is connected to a radial channel 34 of the second end plate 3b, so as to supply cooling oil to an oil cooling channel d1 of the rotor core 2. One end of an oil cooling channel d1 is connected to an oil outlet hole 31 of the first end plate 3a, and the other end of the oil cooling channel d1 is connected to an oil outlet hole 31 of the second end plate 3b through a radial channel 34, so as to realize oil spraying at both ends of the rotor 10.

[0112] In one embodiment, the oil cooling circuit design of the rotor 10 designs a channel for supplying oil to the rotor core 2 in the rotor core 2 itself. In one embodiment, the oil cooling circuit of the rotor 10 designs a channel for supplying oil to the rotor core 2 in the first end plate 3a. In the embodiment of the present application, the oil cooling circuit of the rotor 10 supplies the cooling oil provided by the rotor shaft 1 into the rotor core 2 and discharges it from the rotor end plates 3 on both sides.

[0113] In summary, the embodiment of the present application provides a driving motor 100 including a carbon fiber rotor, wherein at least one of the two rotor end plates 3 of the rotor 10 includes an annular protrusion 32 for abutting against the rotor core 2 at one end facing the rotor core 2, and the rotor core 2 is abutted by the annular protrusion 32, so that the rotor end plate 3 presses the rotor core 2, and the circumferential edge of the rotor end plate 3 does not warp away from the rotor core 2, thereby avoiding the appearance of a gap between the rotor end plate 3 and the rotor core 2 that is connected to the outer periphery of the rotor 10. In the process of winding the carbon fiber onto the outer peripheral surface of the rotor core 2 to form the carbon fiber sleeve 5, the carbon fiber will not be embedded between the rotor end plate 3 and the rotor core 2, which is used to ensure the stability of the rotor 10 structure and is conducive to improving the performance of the driving motor 100.

[0114] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A drive motor comprising a carbon fiber rotor, characterized in that: The drive motor comprises a stator and a carbon fiber rotor, wherein the central hole of the stator is used to accommodate the carbon fiber rotor, and the carbon fiber rotor comprises a rotor core, a rotor end plate, a fixing member and a carbon fiber sleeve, wherein the rotor end plate is arranged between the rotor core and the fixing member in the axial direction of the drive motor, and the fixing member is used to limit the axial displacement of the rotor end plate relative to the rotor core, wherein: The side of the rotor end plate facing the rotor core includes an annular protrusion, and the annular protrusion is used to abut the end surface of the rotor core facing the rotor end plate. The carbon fiber sleeve is used to wrap around the outer circumferential surface of the rotor core and the outer circumferential surface of the annular protrusion.

2. The drive motor according to claim 1, characterized in that: Along the radial direction of the drive motor, the outer diameter of the annular protrusion is less than or equal to the outer diameter of the rotor core.

3. The drive motor according to claim 1 or 2, characterized in that: The drive motor further comprises another fixing member and another rotor end plate, wherein the other rotor end plate is arranged between the other fixing member and an end of the one rotor core away from the one rotor end plate along the axial direction of the drive motor, and the other fixing member is used to limit the axial displacement of the one rotor end plate relative to the rotor core; The other rotor end plate includes another annular protrusion on one side facing the one rotor core, and the other annular protrusion is used to abut against the end surface of the one rotor core facing the other rotor end plate, and the one carbon fiber sleeve is also used to wrap around the outer peripheral surface of the other annular protrusion.

4. The drive motor according to any one of claims 1 to 3, characterized in that: Along the radial direction of the drive motor, the inner diameter of the annular protrusion is greater than the outer diameter of the fixing member.

5. The drive motor according to any one of claims 1 to 4, characterized in that: Along the axial direction of the drive motor, the end surface of the rotor end plate facing away from the rotor core includes a central groove, and the central groove is used to accommodate the fixing member; Along the radial direction of the drive motor, the inner diameter of the one annular protrusion is greater than the outer diameter of the one central groove.

6. The driving motor according to claim 4, characterized in that: Along the axial direction of the drive motor, the distance between the groove bottom of the central groove and the end surface of the rotor end plate facing the rotor core is greater than the axial height of the annular protrusion protruding from the rotor end plate.

7. The drive motor according to claim 5 or 6, characterized in that: The central groove comprises an annular groove wall surrounding the groove bottom, wherein the annular groove wall is connected between the groove bottom and an end surface of the rotor end plate facing away from the rotor core; Along the radial direction of the drive motor, the outer diameter of one end of the annular side wall connected to the slot bottom is smaller than the outer diameter of one end of the annular side wall connected to the end surface of one rotor end plate away from one rotor core.

8. The driving motor according to any one of claims 5 to 7, characterized in that: Along the axial direction of the drive motor, the distance between the groove bottom of the central groove and the end surface of the rotor end plate away from the rotor core is greater than the axial height of the annular protrusion protruding from the rotor end plate.

9. The driving motor according to any one of claims 1 to 8, characterized in that: The one rotor end plate comprises a first structural segment and a second structural segment; Along the axial direction of the drive motor, the first structural segment is adjacently arranged between the one rotor core and the second structural segment, the one annular protrusion is at least a part of the first structural segment, and the axial length of the second structural segment is greater than the axial height of the annular protrusion protruding from the one rotor end plate; Along the radial direction of the drive motor, an outer diameter of an end of the second structure segment facing the first circumferential surface is larger than an outer diameter of the first structure segment.

10. The driving motor according to claim 9, characterized in that: Along the radial direction of the drive motor, an outer diameter of an end of the second structure segment facing away from the first structure segment is smaller than an outer diameter of an end of the second structure segment facing the first structure segment.

11. The drive motor according to claim 9 or 10, characterized in that: Along the radial direction of the drive motor, an outer diameter of an end of the second structure segment facing away from the first structure segment is larger than an inner diameter of the annular protrusion.

12. The driving motor according to any one of claims 9 to 11, characterized in that: Along the axial direction of the drive motor, the distance between the second structure segment and the one rotor core is smaller than the distance between the one fixing member and the one rotor core.

13. The driving motor according to any one of claims 1 to 12, characterized in that: Each of the rotor end plates comprises a plurality of oil outlet holes, each of the oil outlet holes being connected to two end surfaces of the balancing end plate along the circumference of the drive motor, and each of the oil outlet holes being used to spray the cooling oil in the rotor core out of a side of the balancing end plate away from the one rotor core; Along the radial direction of the drive motor, the sum of the distance between each oil outlet hole and the axis of the rotor and the diameter of the oil outlet hole is smaller than the distance between the inner circumferential surface of the annular protrusion and the axis of the rotor.

14. A powertrain, characterized in that: The power assembly includes a reducer and a drive motor as claimed in claim 13, and the drive motor is drivingly connected to the reducer.

15. An electric vehicle, characterized in that: The electric vehicle comprises wheels, a transmission mechanism and the powertrain as claimed in claim 14, wherein the powertrain drives the wheels through the transmission mechanism.

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