Including drive motors with carbon fiber rotors, powertrains, and electric vehicles

Abstract

This application provides a drive motor, powertrain, and electric vehicle including a carbon fiber rotor. The drive motor includes a stator and a carbon fiber rotor. The carbon fiber rotor includes a rotor core, a rotor end plate, a fixing member, and a carbon fiber sleeve. Along the axial direction of the drive motor, the rotor end plate is positioned between the rotor core and the fixing member. The fixing member restricts the axial displacement of the rotor end plate relative to the rotor core. The side of the rotor end plate facing the rotor core includes an annular protrusion that abuts against the end face of the rotor core facing the rotor end plate. The carbon fiber sleeve is wound around the outer circumferential surface of the rotor core and the outer circumferential surface of the annular protrusion. The carbon fiber in this drive motor does not embed within the rotor and affect the rotor structure, thus improving the performance of the drive motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more particularly to a drive motor, powertrain, and electric vehicle including a carbon fiber rotor. Background Technology

[0002] With the development of new energy vehicles, the electric motors in the powertrain of electric vehicles are becoming increasingly high-speed, high-density, and miniaturized. An electric 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 that include carbon fiber sleeves, if the carbon fiber becomes embedded inside the rotor during the winding process, it can affect the rotor's safety and the motor's performance. In existing carbon fiber rotors, the two ends of the rotor core are fixed by end plates. If a gap appears between the end plate and the rotor core, the carbon fiber can enter the gap, affecting the motor's performance. Summary of the Invention

[0004] This application provides a drive motor, powertrain, and electric vehicle including a carbon fiber rotor. The carbon fiber in the drive motor does not embed itself in the rotor and affect the rotor structure, which is beneficial to improving the performance of the drive motor.

[0005] In a first aspect, embodiments of this application provide a drive motor including a carbon fiber rotor. The drive motor includes a stator and a carbon fiber rotor. A central hole in 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. Along the axial direction of the drive motor, a rotor end plate is arranged between a rotor core and a fixing member. The fixing member is used to limit the axial displacement of a rotor end plate relative to the rotor core. A side of the rotor end plate facing the rotor core includes an annular protrusion for abutting against the end face of the rotor core facing the rotor end plate. A carbon fiber sleeve is used to wrap around the outer peripheral surface of the rotor core and the outer peripheral surface of the annular protrusion.

[0006] The drive motor provided in this application embodiment has a rotor end plate arranged adjacent to the rotor core along the axial direction of the drive motor. The aforementioned annular protrusion abuts against the axial end face of the rotor core, and the space enclosed by the annular protrusion is used to maintain a distance between the center position of the rotor end plate and the rotor core. The center position of the rotor end plate is pressed against the rotor core by a fixing member, and the annular protrusion maintains contact with the rotor core, preventing the formation of a gap between the rotor end plate and the rotor core that communicates with the outer circumference of the rotor. During the process of winding carbon fiber onto the outer circumference of the rotor core to form a carbon fiber sleeve, carbon fiber will not be embedded in the aforementioned gap and enter the rotor interior, thereby ensuring the structural safety of the rotor and improving 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. Rotor end plates are arranged at one end of the rotor core, and the outer circumferential surface of the annular protrusion is adjacent to the outer circumferential surface of the rotor core for carbon fiber winding. During the process of winding carbon fiber from the outer circumferential surface of the rotor core to the annular protrusion to form a carbon fiber sleeve, no steps affecting the carbon fiber winding occur, reducing the winding difficulty. The outer diameter of the annular protrusion is equal to the outer diameter of the rotor core, and the outer circumferential surface of the annular protrusion and the outer circumferential surface of the rotor core maintain good continuity along the axial direction of the drive motor, facilitating carbon fiber winding and forming.

[0008] In one embodiment, the drive motor further includes another fixing member and another rotor end plate. Along the axial direction of the drive motor, the other rotor end plate is positioned between the other fixing member and one end of a rotor core facing away from the first rotor end plate. The other fixing member is used to limit the axial displacement of the first rotor end plate relative to the rotor core. The side of the other rotor end plate facing the first rotor core includes another annular protrusion for abutting against the end face of the first rotor core facing the other rotor end plate. A carbon fiber sleeve is also used to wrap around the outer peripheral surface of the other annular protrusion. The two fixing members respectively press the two rotor end plates against the rotor core. The annular protrusion of each rotor end plate prevents gaps from forming between the rotor core and the rotor end plates. During 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 rotor interior.

[0009] In one embodiment, along the radial direction of the drive motor, the inner diameter of an annular protrusion is larger than the outer diameter of a fixing member. The center position of the rotor end plate is pressed 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 impact of structural deformation caused by the force exerted by the fixing member on the rotor end plate on the contact between the annular protrusion and the rotor core.

[0010] In one embodiment, along the axial direction of the drive motor, a rotor end plate has a central groove on its end face opposite to a rotor core, the central groove accommodating a fixing member; along the radial direction of the drive motor, an annular protrusion has an inner diameter larger than the outer diameter of the central groove. The central groove causes the side of the rotor end plate opposite to the annular protrusion to form an annular boss, the annular boss being opposite to the annular protrusion along the circumferential direction 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 face 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, so as to ensure the structural strength of the rotor end plate.

[0012] In one embodiment, the outer diameter of the 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 opening of the central groove is larger than the area of ​​the bottom of the groove, providing better clamping 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 face of a rotor end plate opposite to a rotor core is greater than the axial height of an annular protrusion protruding from a rotor end plate. The groove depth of the central groove is greater than the axial height of the commutation protrusion, providing better clamping force for the annular protrusion to abut against the rotor core.

[0014] In one embodiment, a rotor end plate includes two adjacent structures along the axial direction of the drive motor, the two structures having different outer diameters. A step formed between the two end structures of the rotor end plate serves 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 arranged adjacently between a rotor core and the second structural segment. An annular protrusion is at least a portion of the first structural segment. The axial length of the second structural segment is greater than the axial height of the annular protrusion protruding from the rotor end plate, providing a greater clamping force for the annular protrusion. Furthermore, along the radial direction of the drive motor, the outer diameter of the end of the second structural segment facing the first structural segment 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 structural segment away from the first structural segment is smaller than the outer diameter of the end of the second structural segment facing the first structural segment to avoid the stator winding.

[0017] In one embodiment, the outer diameter of the end of the second structural segment opposite to the first structural segment is larger than the inner diameter of the annular protrusion, so as to maintain a continuous clamping 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 less 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, causing the circumferential edge of the rotor end plate to warp away from the rotor core. The different directions of the two forces cause the rotor end plate to experience a shear-like force, bringing the steps of the first and second structural segments closer to the rotor core relative to the fixing member, weakening the shearing effect and enhancing the pressing force of the annular protrusion on the rotor core.

[0019] In one embodiment, each rotor end plate includes multiple oil outlet holes, each oil outlet hole connecting two end faces of the rotor end plate along the axial direction of the drive motor, and each oil outlet hole is used to spray cooling oil from the rotor core out of the rotor end plate on the side away from one rotor core; along the radial direction of the drive motor, the sum of the distance between each oil outlet hole and the rotor axis and the diameter of the oil outlet hole is less than the distance between the inner circumferential surface of the annular protrusion and the rotor axis, and the structure of the annular protrusion avoids the oil outlet holes.

[0020] Secondly, embodiments of this application provide a powertrain including a reducer and any of the drive motors provided in the first aspect above, wherein the drive motor is connected to the reducer in a transmission manner.

[0021] Thirdly, embodiments of this application provide 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 second and third aspects mentioned above, please refer to the description of the technical effects achieved by the corresponding design scheme in the first aspect mentioned above. This application will not repeat them here. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an electric vehicle provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of a powertrain provided in an embodiment of this application;

[0025] Figure 3 A cross-sectional structural diagram of a drive motor provided in an embodiment of this application;

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

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

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

[0029] Figure 5a This is a partial structural cross-sectional schematic diagram of a carbon fiber rotor provided in an embodiment of this application;

[0030] Figure 5b This is a partial structural cross-sectional schematic diagram of a carbon fiber rotor provided in an embodiment of this application;

[0031] Figure 6This is a partial structural cross-sectional schematic diagram of a carbon fiber rotor provided in an embodiment of this application;

[0032] Figure 7 This is a partial structural cross-sectional schematic diagram of a carbon fiber rotor provided in an embodiment of this application;

[0033] Figure 8 This is a partial structural cross-sectional schematic diagram of a carbon fiber rotor provided in an embodiment of this application;

[0034] Figure 9 This is a partial structural cross-sectional schematic diagram of a carbon fiber rotor provided in an embodiment of this application;

[0035] Figure 10 This is a partial structural cross-sectional schematic diagram of a carbon fiber rotor provided in an embodiment of this application; Figure 11a This is a schematic diagram of the structure of the first end plate of a carbon fiber rotor provided in an embodiment of this application;

[0036] Figure 11b This is a schematic diagram of the structure of the first end plate of a carbon fiber rotor provided in an embodiment of this application;

[0037] Figure 11c This application provides a schematic cross-sectional view of a first end plate according to an embodiment;

[0038] Figure 12 This is a schematic diagram of the structure of the second end plate of a carbon fiber rotor provided in an embodiment of this application;

[0039] Figure 13 This is a cross-sectional structural diagram of a carbon fiber rotor provided in an embodiment of this application.

[0040] Figure label:

[0041] 1000 - Powertrain; 2000 - Transmission; 3000 - Wheels;

[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; 32-Annular protrusion; 33-Central groove; 34-Radial channel; 4-Pressure ring; 5-Carbon fiber sleeve;

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

[0046] In motors with carbon fiber sleeves, structural warping of the end plates fixing the rotor core can create gaps between the end plates and the rotor core. During the carbon fiber winding process, the carbon fiber can become embedded in these gaps, adversely affecting rotor performance and consequently, motor performance.

[0047] Based on this, embodiments of this application provide a drive motor, powertrain, and electric vehicle including a carbon fiber rotor, which prevents the carbon fiber from entering the gap between the rotor core and the rotor end plate, thus ensuring rotor safety and improving motor efficiency.

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0049] Figure 1 This is a schematic diagram of the structure of an electric vehicle provided in an embodiment of this application, such as... Figure 1 As shown, this electric vehicle is a wheeled device driven or towed by a power unit, including pure electric vehicles (pure EVs / battery EVs), hybrid electric vehicles (HEVs), range-extended electric vehicles (REEVs), and plug-in hybrid electric vehicles (PHEVs). The electric vehicle includes a powertrain 1000, a transmission mechanism 2000, and wheels 3000. The powertrain 1000 drives the wheels 3000 through the transmission mechanism 2000. The powertrain 1000 converts electrical energy into mechanical energy. The transmission mechanism 2000 connects the powertrain 1000 and the wheels 3000. The electric vehicle also includes a frame to withstand the loads from the internal and external environment and a battery to supply power to the powertrain 1000.

[0050] Figure 2 This is a schematic diagram of the powertrain 1000 provided in an embodiment of this application. Figure 2As shown, the powertrain 1000 includes a drive motor 100 and a motor controller 200. The motor controller 200 converts the direct current (DC) supplied by the battery into alternating current (AC) and delivers the AC power to the drive motor 100. In one embodiment, the powertrain 1000 further includes a reducer 300, through which the power output of the drive motor 100 is connected to the wheels 3000 of the electric vehicle. The reducer 300 is also referred to as a transmission. The drive motor 100 of the electric vehicle is typically a permanent magnet synchronous or AC asynchronous motor.

[0051] In one embodiment, the powertrain 1000 is a single-drive system, that is, the powertrain 1000 includes a 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 This is a schematic cross-sectional view of a drive motor 100. (See attached diagram.) Figure 3 As shown, the drive motor 100 includes a rotor 10 and a stator 20.

[0055] In one embodiment, the drive motor 100 further includes a housing 30, a stator 20, and a portion of a rotor 10 housed within the housing 30. One end of the rotor 10 is rotatably mounted to the housing 30, and the other end extends out of the housing 30 for transmission connection to a reducer 300. The end of the rotor 10 used for transmission connection to the reducer 300 is a power output terminal S, which is also the power output terminal of the drive motor 100. The stator 20 is sleeved around the rotor core 2, and the stator 20 includes a stator core 201 and a stator winding 202 wound around the stator core 201. Energizing the stator winding 202 causes the stator core 201 to generate a magnetic field that drives the rotor 10 to rotate and output power.

[0056] In this embodiment, the axial direction of the drive motor, the axial direction of the stator, and the axial direction of the rotor all 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 all 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 all 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. For example... Figure 4a and Figure 4bAs shown, the rotor 10 includes a rotor shaft 1, a rotor core 2, two rotor end plates 3, two fixing members 4, and a carbon fiber sleeve 5. The rotor shaft 1 is also the motor shaft of the drive motor 100, with one end of the rotor shaft 1 serving as a power output end S, which is used to connect to a reducer. The two rotor end plates 3 are arranged along the axial direction of the drive motor on both sides of the rotor core 2. The rotor core 2 and the two rotor end plates 3 are fixed to the rotor shaft 1 via keyway engagement. The two fixing members 4 are arranged along the axial direction of the drive motor on the side of the two rotor end plates 3 facing away from the rotor core 2, and each fixing member 4 is used to axially limit the rotor end plate 3 along the axial direction of the drive motor. The carbon fiber sleeve 5 wraps around the outer circumferential surface of the rotor core 2 and a portion of the outer circumferential surface of the two rotor end plates 3 along the circumferential direction of the drive motor. The carbon fiber sleeve 5 is formed by winding carbon fiber around the outer circumferential surfaces of the rotor core 2 and the two rotor end plates 3.

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

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

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

[0061] In one embodiment, the first fixing member 4a is an annular structure, which is used to fix the rotor shaft 1 by friction.

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

[0063] Figure 4c A schematic cross-sectional view of the rotor 10 is shown. Figure 4c As shown, the rotor core 2 and two rotor end plates 3 are assembled onto the rotor shaft 1. The first end plate 3a and the second end plate 3b are pressed against the two axial end faces of the rotor core 2 by the first fixing member 4a and the second fixing member 4b, respectively. A carbon fiber sleeve 5 is wrapped around the outer circumference of the rotor core 2 to protect it. The second end plate 3b, the rotor core 2, and the first end plate 3a are fitted onto the outer circumference of the rotor shaft 1 along the axial direction of the motor. The rotor shaft 1 is circumferentially fixed to the rotor core 2 and each rotor end plate 3 by a keyway fit. After the rotor core 2 and the two rotor end plates 3 are assembled, the side of the second end plate 3b facing away from the multiple rotor laminations 21 abuts against the second fixing member 4b of the rotor shaft 1. The first fixing member 4a is mounted on the side of the rotor shaft 1 away from the power output end S along the axial direction of the drive motor. The first fixing member 4a is pressed and fixed on the side of the first end plate 3a away from the multiple rotor laminations 21. The first fixing member 4a and the second fixing member 4b provide axial limiting for the multiple stator laminations 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 circumferential surface of the rotor core 2 to form a carbon fiber sleeve 5. Along the axial direction of the drive motor, both ends of the carbon fiber sleeve 5 extend beyond both ends of the rotor core 2 and partially extend to the outer circumferential surfaces of the first end plate 3a and 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 towards each other along the axial direction of the drive motor to press the first end plate 3a and the second end plate 3b against both ends of the rotor core 2.

[0065] like Figure 4cAs shown by the solid arrows, the first fixing member 4a applies a force close to the rotor core 2 to the first end plate 3a along the axial direction of the drive motor. The force on the first end plate 3a is uneven along the radial direction of the drive motor, causing the circumferential edge portion of the first end plate 3a to move away from the rotor core 2 along the axial direction of the drive motor, as shown by the dashed arrows. The middle part of the first end plate 3a is close to the rotor core 2, while the circumferential edge portion moves away from the rotor core 2. The circumferential edge of the first end plate 3a deforms and warps, resulting in a gap between the circumferential edge portion of the first end plate 3a and the rotor core 2. This gap communicates with the outer peripheral space of the rotor 10. Similarly, the second fixing member 4b is resisted by the second end plate 3b and applies a reaction force close to the rotor core 2 to the second end plate 3b in the opposite direction. The force on the second end plate 3b is uneven along the radial direction of the drive motor, causing the circumferential edge portion of the second end plate 3b to move away from the rotor core 2 along the axial direction of the drive motor, as shown by the dashed arrows. The middle part of the second end plate 3b is close to the rotor core 2, and the circumferential edge 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 of the second end plate 3b and the rotor core 2. This gap is connected to the outer circumferential space of the rotor 10.

[0066] If a gap is created between any rotor end plate 3 and rotor core 2 that communicates with the outer peripheral space of rotor 10, the carbon fibers of the carbon fiber sleeve 5 will become embedded in this gap during the winding process, adversely affecting the structure of rotor 10 and consequently affecting the performance of drive motor 100. One of the two rotor end plates 3 includes an annular protrusion 32 on the side facing rotor core 2. This annular protrusion 32 abuts against the end face of rotor core 2 facing rotor end plate 3. The carbon fiber sleeve 5 is used to wind around the outer peripheral surface of rotor core 2 and the outer peripheral surface of annular protrusion 32. Due to the presence of annular protrusion 32, a space j is formed between the end face of rotor end plate 3 facing rotor core 2, the inner peripheral surface of annular protrusion 32, and the axial end face of rotor core 2. The end face of rotor end plate 3 corresponding to this space j remains non-contacting with rotor core 2 under no force.

[0067] like Figure 5b As shown, the fixing member 4 limits the rotor end plate 3 along the axial direction of the drive motor. The fixing member 4 applies force to the rotor end plate 3, causing the structure of the rotor end plate 3 corresponding to space j to deform and move closer to the rotor core 2 as indicated by the dashed line. The aforementioned space j is used to accommodate the structural deformation of the rotor end plate 3, preventing the structural deformation of the rotor end plate 3 from causing warping in the direction away from the rotor core 2 as indicated by the dashed arrow, thus avoiding a gap between the outer periphery of the rotor end plate 3 and the outer periphery of the rotor core 2. During 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 embed between the rotor end plate 3 and the rotor core 2, affecting the performance of the rotor 10.

[0068] In one embodiment, the fixing member 4 is fitted onto the rotor shaft 1 to limit the axial displacement of the rotor end plate 3 relative to the rotor core 2. In another embodiment, the space enclosed by the inner circumferential surface of the annular protrusion 32 is the region where the center 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 of the rotor end plate 3. The annular protrusion 32 of the rotor end plate 3 surrounds the center of the fixing member 4. The center of the rotor end plate 3 is brought closer to the rotor core 2 by the force of the fixing member 4. The aforementioned space j accommodates the structural deformation of the rotor end plate 3, preventing the edge of the rotor end plate 3 from deforming and warping away from the rotor core 2, thus avoiding gaps.

[0069] In one embodiment, such as Figure 6 As shown, along the axial direction of the drive motor, the axial height h1 of the annular protrusion 32 protruding from the rotor end plate 3 is less than the distance h2 between the bottom of the annular protrusion 32 and the end face of the rotor end plate 3 away from the rotor core 2. The axial height h1 of the annular protrusion 32 protruding from the rotor end plate 3 is the axial length of this space.

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

[0071] In one embodiment, such as Figure 6 As shown, the inner diameter R12 of the annular protrusion 32 is larger than the outer diameter R4 of the aforementioned fixing member 4. Taking the axis Q of the rotor 10 as a reference, the distance from the inner circumference of the annular protrusion 32 along the radial direction of the drive motor to the axis Q is the inner diameter R12 of the annular protrusion 32, and the distance from the outer circumference of the fixing member 4 along the radial direction of the drive motor to the axis Q 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, reducing the impact of structural deformation caused by the force exerted by the fixing member 4 on the rotor end plate 3 on the contact between the annular protrusion 32 and the rotor core 2.

[0072] It should be understood that in the actual structure of rotor 10, the structural deformation of rotor end plate 3 caused by the clamping force of fixing member 4 along the axial direction of drive motor is small, and the space j formed by the enclosure between rotor end plate 3 and rotor core 2 is also small. Figure 5a , Figure 5b as well as Figure 6 The structural diagram in the image is enlarged to show the relative positions and connections 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 creating gaps between the rotor end plate 3 and the rotor core 2 that would lead to the embedding of carbon fibers.

[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 at least a portion of the outer circumferential surface of the rotor core 2 and the outer circumferential surface of the annular protrusion 32. During the process of winding the carbon fiber around the rotor core 2, the winding proceeds from one side of the rotor core 2 towards the side of the rotor end plate 3. If a step occurs between the rotor end plate 3 and the rotor core 2 due to a mismatch in 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. Specifically, with the axis Q of the rotor 10 as a reference, the distance from the outer circumferential surface of the annular protrusion 32 along the radial direction of the drive motor to the axis Q is the outer diameter R11 of the annular protrusion 32, and the distance from the outer circumferential surface of the rotor core 2 along the radial direction of the drive motor to the axis Q is the outer diameter R0 of the rotor core 2.

[0074] In one embodiment, combined with Figure 6 As shown, along the radial direction of the drive 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 drive motor. The end of the annular protrusion 32 facing the rotor core 2 abuts against the rotor core 2. The outer circumferential surface of the annular protrusion 32 and the outer circumferential surface of the rotor core 2 are adjacent to each other along the axial direction of the drive motor and remain relatively continuous. During the process of the carbon fiber winding from the rotor core 2 to the annular protrusion 32, the reference plane of the carbon fiber winding remains relatively continuous, improving the carbon fiber winding efficiency. The structure of the carbon fiber sleeve 5 formed by the carbon fiber winding will also be flatter, and the bond between the carbon fiber sleeve 5 and the rotor core 2 will be more reliable.

[0075] In one embodiment, combined with 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, which means the wall thickness of the annular protrusion 32 is 0.15mm-0.2mm. The structure of the annular protrusion 32 does 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 fine-tuning role in the assembly.

[0076] In some embodiments, 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, thereby forming a step 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 and prevent the carbon fiber sleeve 5 from coming off the rotor end plate 3 along the axial direction of the drive motor.

[0077] In one embodiment, such as Figure 7As shown, the rotor end plate 3 includes a first structural segment 301 and a second structural segment 302, which are arranged adjacent to the first structural segment 301 along the axial direction of the drive motor. Of course, the first end plate 3a is a one-piece structure; the structural division of the first structural segment 301 and the second structural segment 302 is only for illustrative purposes. Figure 6 The first structural segment 301 and the second structural segment 302 are divided by dashed lines. 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 face of the first structural segment 301 facing away from the second structural segment 302. Along the axial direction of the drive motor, the annular protrusion 32 protrudes from the rotor end plate 3 at a height 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 portion 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 smaller than the outer diameter of the second structural segment 302, and an annular step is formed between the first structural segment 301 and the second structural segment 302 surrounding the rotor end plate 3. In some embodiments, the outer peripheral surfaces of the first structural segment 301 and 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, forming 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 on the end face of the first structural segment 301 facing the rotor core 2 abuts against the rotor core 2. 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. During 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. The step between the second structural segment 302 and the first structural segment 301 axially limits the carbon fiber sleeve 5, preventing the carbon fiber sleeve 5 from coming off 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. 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. The second structural segment 302 with a smaller radial dimension is used to avoid the end winding of the stator 20, ensuring a safety distance and preventing electrical conduction between the rotor end plate 3 and the winding of the stator 20, which would affect the safe operation of the motor.

[0080] In one embodiment, along the axis 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. The end of the first structural segment 301 facing the rotor core 2 includes an annular protrusion 32. The second structural segment 302 provides clamping force to the annular protrusion 32 to ensure that there is no gap between the rotor end plate 3 and the rotor core 2.

[0081] To further avoid the end windings of the stator 20 in the drive motor 100, such as Figure 8 As shown, the radial dimension of the outer circumferential surface of the second structural segment 302 of the rotor end plate 3 varies along the axial direction of the drive motor, such 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 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 safe distance is maintained between the rotor 10 and the stator 20 along 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 from the rotor core 2 to the first end plate 3a.

[0083] In one embodiment, the outer peripheral surface of the second structural segment 302 forms an angle β with the axial direction of the drive motor, and the angle β ranges from 5° to 10°. During the rotation of the rotor 10, the external airflow acts on the outer peripheral surface of the second structural segment 302 to generate a component force along the axial direction of the drive motor pointing towards the rotor core 2, which also helps to maintain the contact between the rotor end plate 3 and the rotor core 2, and avoids the appearance of gaps between the rotor end plate 3 and the rotor core 2 for the embedded carbon fiber.

[0084] Referring to the overall structure of rotor 10, please continue to refer to... Figure 9 As shown, the outer diameter R221 of the end of the second structural segment 302 facing the first structural segment 301 is the largest outer diameter of the rotor end plate 3. This outer diameter R221 is greater than the outer diameter R0 of the rotor core 2 to axially limit the carbon fiber sleeve 5. This outer diameter R221 is less than or equal to the outer diameter of the carbon fiber sleeve 5 to avoid increasing 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 deformed by the clamping 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 prevents gaps from appearing between the rotor end plate 3 and the rotor core 2.

[0086] In some embodiments, such as Figure 10 The rotor end plate 3 shown has a central groove 33 on its end face away from the rotor core 2. The central groove 33 is used to accommodate the fixing member 4.

[0087] In the drive motor provided in this application embodiment, the rotor end plate 3 includes a first structural segment 301 and a second structural segment 302. A central groove 33 is located in the second structural segment 302, and the opening of the central groove 33 is located on the end face of the second structural segment 302 away from the first structural segment 301. In one embodiment, the central groove 33 is formed by recessing the end face of the second structural segment 302 in the direction of the drive motor axial direction toward the first structural segment 301.

[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, the groove wall b2 surrounding the rotor shaft 1.

[0089] The rotor end plate 3 is assembled 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 requirements of the force exerted by the fixing member 4 on 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 face of the rotor end plate 3 facing away from the rotor core 2.

[0090] In the drive motor provided in this embodiment, the structure between the groove wall b2 of the central groove 33 and the outer peripheral surface of the second structural segment 302 is equivalent to an annular boss on the rotor end plate 3. Along the axial direction of the drive motor, the annular protrusion 32 is opposite to this boss.

[0091] Along the axial direction of the drive 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. The axial distance between the groove bottom b1 of the central groove 33 and the end face of the first structural segment 301 facing 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. 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 drive motor, the groove wall b2 of the central groove 33 is set at an angle to the axial direction of the drive motor, such that the area of ​​the opening of the central groove 33 is larger than the area of ​​the groove bottom b1. Therefore, 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 segment 302 is similar to a trapezoid, which helps to enhance the structural strength of the first end plate 3a and provides better support for the annular protrusion 32 to abut against the rotor core 2.

[0093] like Figure 9 As shown, the annular protrusion 32 of the rotor end plate 3 abuts against one axial end face of the rotor core 2. The fixing member 4 is assembled on the side of the rotor end plate 3 facing away from the rotor core 2, and 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 frustoconical. The outer diameter R24 ​​of the central groove 33 facing the rotor core 2 is smaller than the outer diameter R23 of the central groove 33 facing 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 protrusion formed between the central groove 33 and the outer circumferential surface of the rotor end plate 3 is sufficiently large to provide better support for the annular protrusion 32. The fixing member 4 presses against the rotor end plate 3 to provide clamping force for the annular protrusion 32.

[0094] In one embodiment, along the axial direction of the drive motor, the fixing member 4 is partially received within the central groove 33 and partially protrudes from the central groove 33. In some embodiments, please continue to refer to... Figure 9 As shown, the distance h31 between the second structural segment 302 and the rotor core 2 is less than the distance between the fixing member 4 and the rotor core 2. In this embodiment, 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 against the rotor core 2. The circumferential edge of the rotor end plate 3 is 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 steps of the first structural segment 301 and the second structural segment 302 are brought closer to the fixing member 4 towards the rotor core 2, which weakens the shear force effect inside the rotor end plate 3 and enhances the clamping force.

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

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

[0098] In one embodiment, such as Figure 10 As shown, each oil outlet 31 is arranged radially along the drive motor between the inner circumferential surface of the annular protrusion 32 and the rotor shaft 1. Along the radial direction of the drive motor, the distance R12 between the inner circumferential surface of the annular protrusion 32 and the axis of the rotor 10 is greater than the sum of the distance between the oil outlet 31 and the axis of the rotor 10, and the diameter of the oil outlet 31, R3. The annular protrusion 32 and the oil outlet 31 are arranged radially along the drive motor to avoid obstructing the oil passage connection of the oil outlet 31.

[0099] In one embodiment, such as Figure 10 As shown, the distance between the outer diameter R4 of the fixing member 4 and the outer diameter R24 ​​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 spraying of the oil outlet holes 31. Along 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, both rotor end plates 3 of the rotor 10 provided in this application are the rotor end plates 3 including the annular protrusion 32 described above. The two rotor end plates 3 are pressed together with the rotor core 2 along the axial direction of the drive motor to avoid gaps communicating with the outer periphery of the rotor 10, so as to prevent the carbon fibers of the carbon fiber sleeve 5 from embedding into the rotor 10.

[0101] In one embodiment, such as Figure 11a The rotor 10 has two rotor end plates 3, including a first end plate 3a. The first end plate 3a includes a central hole k through which the rotor shaft 1 passes, the central hole k extending 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, each oil outlet hole 31 connecting two axial end faces of the first end plate 3a. In one embodiment, each oil outlet hole 31 extends 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 circumference of the drive motor. In another embodiment, the plurality of oil outlet holes 31 are arranged at intervals around the central hole k, and the shape of the oil outlet holes 31 is, for example, circular.

[0102] In one embodiment, Figure 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, which protrudes from the end face of the first end plate 3a along the axial direction of the drive motor. This annular protrusion 32 surrounds the central hole k circumferentially around the drive motor. Each of the aforementioned oil outlet holes 31 is arranged radially between the inner circumferential surface of the annular protrusion 32 and the central hole k. Along the radial direction of the drive motor, the distance between the inner circumferential surface of the annular protrusion 32 and the central hole k is greater than the sum of the distance between the opening of the oil outlet hole 31 on this end face and the central hole k, and the diameter of the oil outlet hole 31. The annular protrusion 32 and the oil outlet hole 31 are arranged radially to avoid interference with the oil passage connection of the oil outlet hole 31.

[0103] In one embodiment, the outer peripheral surface of the annular protrusion 32 is a portion of the outer peripheral surface of the first end plate 3a. In another embodiment, the end surface of the first end plate 3a includes a groove, and the structure formed between the sidewall of the groove and the outer peripheral surface of the first end plate 3a is the annular protrusion 32.

[0104] In one embodiment, the annular protrusion 32 continuously and uninterruptedly surrounds the outer periphery of the first end plate 3a.

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

[0106] like Figure 11b The other end face of the first end plate 3a shown, the end face of the first end plate 3a opposite to the rotor core 2 includes a central groove 33, which is used to accommodate the aforementioned first fixing member 4a.

[0107] Figure 11c The cross-sectional structure of the first end plate 3a is shown. The structure between the groove wall b2 of the central 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. The central groove 33 is frustoconical. For ease of understanding, the cross-section of the boss is shown in shaded form. Along the axial direction of the drive motor, the annular protrusion 32 is opposite to the annular protrusion formed between the groove wall b2 of the central groove 33 and the outer peripheral surface of the second structural segment 302. 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. 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 segment 302 is similar to a trapezoid, which helps to enhance the structural strength of the first end plate 3a and provides better support for the annular protrusion 32 to abut against the rotor core 2.

[0108] In one embodiment, such as Figure 12 This refers to the structure of the second end plate 3b among the two rotor end plates 3 of rotor 10. For example... Figure 12 As shown, the second end plate 3b has a similar structure to the first end plate 3a, also including a first structural segment 301 and a second structural segment 302. A step for axially limiting the carbon fiber sleeve 5 is formed between the first structural segment 301 and the second structural segment 302. One end of the second end plate 3b facing the rotor core 2 includes an annular protrusion 32, which 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 face of the rotor core 2 away from the first end plate 3a. The differences between the second end plate 3b and the first end plate 3a include that the second end plate 3b includes multiple radial channels 34, spaced apart along the circumference of the drive motor. Each radial channel 34 connects the central hole k of the second end plate 3b to an oil outlet hole 31 along the radial direction of the drive motor. These multiple radial channels 34 are used to transmit cooling oil into the rotor core 2.

[0109] It should be understood that when Figure 12 The second end plate 3b shown is assembled at another axial end face of the rotor core 2. Under the force of 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 at the center 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 there is no gap between the second end plate 3b and the rotor core 2 that communicates with the outer periphery of the rotor 10, preventing the carbon fiber 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 Figure 13 The example of a rotor 10 cross-sectional structure includes a rotor shaft 1 comprising an oil inlet channel formed by a combination of an axial flow channel d01 and a plurality of radial flow channels d02, which is used to supply oil to the interior of the rotor core 2.

[0111] In one embodiment, an axial flow channel d01 of the rotor shaft passes through the rotor shaft 1 along the axial direction of the drive motor, and multiple radial flow channels d02 are arranged at intervals along the circumference of the drive motor. Each radial flow channel d02 connects the outer circumferential 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, thereby supplying 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 31 of the first end plate 3a, and the other end of the oil cooling channel d1 is connected to an oil outlet 31 of the second end plate 3b through a radial channel 34, for realizing oil spraying at both ends of the rotor 10.

[0112] In one embodiment, the oil cooling circuit of rotor 10 is designed with the oil supply channel for rotor core 2 located within rotor core 2 itself. In another embodiment, the oil cooling circuit of rotor 10 is designed with the oil supply channel for rotor core 2 located within the first end plate 3a. In this embodiment, the oil cooling circuit of rotor 10 supplies cooling oil from rotor shaft 1 into rotor core 2 and discharges it from the rotor end plates 3 on both sides.

[0113] In summary, the drive motor 100 including a carbon fiber rotor provided in this application embodiment has an annular protrusion 32 at the end of at least one of the two rotor end plates 3 facing the rotor core 2 for abutting against the rotor core 2. This annular protrusion 32 abuts against the rotor core 2, causing the rotor end plate 3 to press tightly against the rotor core 2. This prevents warping of the circumferential edge of the rotor end plate 3 away from the rotor core 2, avoiding any gap between the rotor end plate 3 and the rotor core 2 that communicates with the outer periphery of the rotor 10. During the process of winding carbon fiber onto the outer circumferential surface of the rotor core 2 to form a carbon fiber sleeve 5, carbon fiber will not be embedded between the rotor end plate 3 and the rotor core 2, ensuring the structural stability of the rotor 10 and improving the performance of the drive motor 100.

[0114] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A drive motor comprising a carbon fiber rotor, characterized in that, The drive motor includes a stator and a carbon fiber rotor. A central hole in the stator accommodates the carbon fiber rotor. The carbon fiber rotor includes a rotor core, a rotor end plate, a fixing member, and a carbon fiber sleeve. Along the axial direction of the drive motor, the rotor end plate is arranged between the rotor core and the fixing member. The fixing member restricts the axial displacement of the rotor end plate relative to the rotor core. The rotor end plate includes an annular protrusion on the side facing the rotor core, the annular protrusion being used to abut against the end face of the rotor core facing the rotor end plate, and the carbon fiber sleeve being used to wrap around the outer peripheral surface of the rotor core and the outer peripheral surface of the annular protrusion.

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

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

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

5. The drive motor according to any one of claims 1-4, characterized in that, Along the axial direction of the drive motor, the end face of one rotor end plate opposite to the rotor core includes a central groove for accommodating the fixing member; Along the radial direction of the drive motor, the inner diameter of the annular protrusion is larger than the outer diameter of the central groove.

6. The drive motor as described in claim 4, characterized in that, Along the axial direction of the drive motor, the distance between the bottom of the central groove and the end face 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 as described in claim 5 or 6, characterized in that, The central groove includes an annular groove wall surrounding the groove bottom, the annular groove wall being connected between the groove bottom and the end face of the rotor end plate opposite to the rotor core; Along the radial direction of the drive motor, the outer diameter of the end of the annular sidewall connected to the bottom of the slot is smaller than the outer diameter of the end of the annular sidewall connected to the end face of the rotor end plate opposite to the rotor core.

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

9. The drive motor according to any one of claims 1-8, characterized in that, The rotor end plate includes a first structural segment and a second structural segment; Along the axial direction of the drive motor, the first structural segment is arranged adjacent to each other between the rotor core and the second structural segment, the 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 rotor end plate. Along the radial direction of the drive motor, the outer diameter of the end of the second structural segment facing the first structural segment is larger than the outer diameter of the first structural segment.

10. The drive motor as described in claim 9, characterized in that, Along the radial direction of the drive motor, the outer diameter of the end of the second structural segment away from the first structural segment is smaller than the outer diameter of the end of the second structural segment facing the first structural segment.

11. The drive motor as described in claim 9 or 10, characterized in that, Along the radial direction of the drive motor, the outer diameter of the end of the second structural segment opposite to the first structural segment is larger than the inner diameter of the annular protrusion.

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

13. The drive motor according to any one of claims 1-12, characterized in that, Each rotor end plate includes multiple oil outlet holes, each oil outlet hole connects two end faces of the rotor end plate along the circumference of the drive motor, and each oil outlet hole is used to spray the cooling oil in the rotor core out of the rotor end plate to the side away from the 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 less 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 powertrain includes a reducer and a drive motor as described in claim 13, wherein the drive motor is drive-connected to the reducer.

15. An electric vehicle, characterized in that, The electric vehicle includes wheels, a transmission mechanism, and a powertrain as described in claim 14, the powertrain driving the wheels via the transmission mechanism.

Images