Axial motor rotor, axial motor, powertrain and vehicle

Abstract

This application provides an axial motor rotor, an axial motor, a powertrain, and a vehicle. The axial motor rotor includes a rotor support and a magnet structure. The rotor support includes a first support portion and a second support portion coaxially arranged. The first support portion is sleeved on the side of the second support portion away from its axis. Multiple magnet units in the magnet structure are arranged sequentially circumferentially, with each magnet unit located between the first and second support portions. The two ends of each magnet unit are fixed to the first and second support portions radially from the second support portion. At least a portion of the first soft magnet and at least a portion of the first permanent magnet in each magnet unit are stacked axially. This application simplifies the manufacturing process of each magnet unit by arranging multiple magnet units in a circular pattern, and improves reliability through rotor support fixation. The first soft magnet is used to concentrate magnetic lines of force, increase air gap magnetic flux density, increase output torque, and improve the performance of the axial motor.

Description

Technical Field

[0001] The present application relates to the technical field of axial motors, and in particular to an axial motor rotor, an axial motor, a powertrain and a vehicle. Background Art

[0002] Compared with the traditional radial magnetic field permanent magnet motor, the axial magnetic field permanent magnet motor has significant advantages such as compact structure, high torque density and high efficiency. In the prior art, the axial magnetic field permanent magnet motor has a low speed in practical applications, and the structure is mostly a surface-mounted structure. As the operating frequency of the rotor increases, the eddy current loss of the traditional surface-mounted permanent magnet rotor structure increases significantly, which will cause the motor performance to decline. At the same time, the rotor reluctance torque component is small, and the power drops quickly at high speeds. Considering the structural strength and the need to maintain a large power at high speeds, it is a preferred solution to make the rotor core into an integral annular structure and embed the magnetic steel in the rotor core. However, the annular core structure is generally wound by silicon steel sheets, and its inner ring wall is an Archimedean involute rather than a circle, which makes it difficult for the inner and outer ring walls of the rotor core to effectively cooperate with other motor rotor structural parts through interference, making the connection between the inner ring wall of the magnetic steel and the motor shaft unreliable and difficult to improve the structural strength. In addition, since the slots on the wound core are punched out by a single punch, their specifications and dimensions are fixed, which means that the magnetic steel cannot be fan-shaped, which will result in a smaller core size occupied by the magnetic steel at the outer diameter of the core and insufficient motor performance. Summary of the invention

[0003] The present application provides an axial motor rotor, an axial motor, a powertrain and a vehicle.

[0004] In a first aspect, the present application provides an axial motor rotor, which comprises a rotor support and a magnet structure; the rotor support comprises a first support portion and a second support portion which are coaxially arranged, and the first support portion is sleeved on a side of the second support portion which is away from the axis of the second support portion; the magnet structure comprises a plurality of magnet units, the plurality of magnet units are arranged in sequence along the circumference of the second support portion, and each of the plurality of magnet units is located between the first support portion and the second support portion, the magnet units are respectively fixed to the first support portion and the second support portion at both ends along the radial direction of the second support portion, the magnet unit comprises a first soft magnet and a first permanent magnet, and at least part of the first soft magnet and at least part of the first permanent magnet are stacked along the axial direction of the second support portion.

[0005] In the present application, on the first aspect, the magnet structure is fixed between the first support part and the second support part, and the two radial ends of the magnet unit along the second support part are respectively fixed to the first support part and the second support part, thereby improving the structural stability between the magnet structure and the rotor bracket, thereby increasing the overall reliability of the axial motor rotor; on the second aspect, the rotor bracket uses two coaxially arranged support parts to limit and fix the two radial ends of the magnet unit. The rotor bracket has a simple structure and saves space, so that the saved space can be used to fill the magnet unit, which is beneficial to increase the volume of the magnet unit, and then to increase the magnetic density, thereby improving the performance of the axial motor; on the third aspect, a plurality of magnet units surround the second support part to form an annular magnet structure, and each magnet unit only occupies the annular magnet structure. A part of the structure, compared with the overall annular magnet structure, the magnet structure formed by splicing a plurality of magnet units around is simpler to process and has higher processing accuracy, which is beneficial to improving the reliability of the axial motor; in the fourth aspect, each magnet unit includes a first soft magnet and a first permanent magnet that are at least partially stacked along the axial direction of the second support portion, the first soft magnet is conducive to the flow of magnetic lines of force, and provides a smooth flow path for the magnetic lines of force. When the first soft magnet is located on the side of the first permanent magnet away from the air gap, the magnetic lines of force flowing outward from the first permanent magnet can flow into the first permanent magnet in the adjacent magnet unit through the first soft magnet. Compared with the magnetic lines of force of the first permanent magnet flowing into the first permanent magnet in the connected magnet unit through the air, the first soft magnet is more conducive to the flow of magnetic lines of force than air, and can reduce magnetic flux loss.

[0006] In a possible implementation, the circumferential dimension of the magnet unit gradually increases from one end close to the second support portion to one end away from the second support portion. Since the second support portion is located on the inner side and the first support portion is located on the outer side, the circumferential dimension of the first support portion is greater than the circumferential dimension of the second support portion, so that the space between the first support portion and the second support portion gradually increases from the area close to the second support portion to the area close to the first support portion. In this embodiment, the magnet unit is arranged as above, so that the magnet unit is fan-shaped, so as to be able to adapt to the space between the first support portion and the second support portion, so that the magnet unit fills a larger area between the first support portion and the second support portion, making full use of the internal space of the rotor bracket, increasing the area of ​​the magnet unit, improving the magnetic density, and increasing the output torque.

[0007] In a possible implementation, the first permanent magnet is continuous along the radial direction of the second support portion. If the first permanent magnet is not continuous along the radial direction of the second support portion, but is arranged radially by a plurality of sub-magnet units, the permanent magnet generally has a high structural strength and is difficult to process. For example, if the permanent magnet is a magnetic steel, it is difficult to align the surfaces of the three permanent magnets along both sides of the circumference, and the processing cost is high. If the surfaces of the three permanent magnets along both sides of the circumference are not aligned, the space of the rotor bracket will be wasted, so that the filling amount of the permanent magnet is reduced, thereby reducing the performance of the axial motor; and the three sub-magnet units require three sets of stamping dies, and the amount of magnetic steel molds is relatively large. In order to ensure the coaxiality of the inner and outer arc walls of the three sub-magnet units, the processing accuracy requirements are high, which makes the processing technology complicated. In this implementation, the first permanent magnet is continuous along the radial direction of the second support portion, and the structure that is a continuous whole in the radial direction can align the surfaces of the first permanent magnet along both sides of the circumference, which is not only simple to process, but also conducive to increasing the volume of the magnet unit and improving the magnetic density.

[0008] In a possible implementation, the projection of the first permanent magnet on the first soft magnet along the axial direction of the second support portion is located inside the first soft magnet. The arrangement in this implementation makes the circumferential size of the first soft magnet larger than the circumferential size of the first permanent magnet, which is beneficial to gathering magnetic flux lines and conductive magnetism. In this implementation, the area of ​​the maximum surface of the first permanent magnet is smaller than the area of ​​the maximum surface of the first soft magnet, so that most or all of the magnetic lines of force flowing out of the first permanent magnet can enter the first soft magnet, gather through the first soft magnet, and flow into adjacent magnet units through the first soft magnet.

[0009] In a possible implementation, the magnet unit further includes a second soft magnet, the first permanent magnet includes a first main body, a first sub-part, and a second sub-part, the first soft magnet, the first main body, and the second soft magnet are stacked along the axial direction of the second support part, and the first sub-part and the second sub-part are arranged on both sides of the first main body and the second soft magnet along the circumferential direction of the second support part. In this embodiment, the first soft magnet and the second soft magnet are respectively arranged on both sides of the first permanent magnet along the axial direction, so that the magnetic lines of force on both sides of the first permanent magnet along the axial direction are gathered by the soft magnets, thereby increasing the air gap magnetic flux density. In this embodiment, the arrangement of the first sub-part and the second sub-part is conducive to gathering the magnetic lines of force. When the first sub-part and the second sub-part protrude toward one side of the air gap, the magnetic lines of force converge into the winding coil on the stator, so that the air gap magnetic flux waveform is close to a sine wave, which can increase the output torque and reduce the torque fluctuation.

[0010] In a possible implementation, the first permanent magnet is a magnetic steel, wherein the circumferential dimension of the first main body gradually increases from the end close to the second support portion to the end away from the second support portion. The first main body is fan-shaped, wherein the first main body is also a magnetic steel, and the magnetic steel is fan-shaped, which can make full use of the space in the rotor bracket, and will not cause the motor performance to be insufficient due to the small size of the magnet unit occupied by the magnetic steel at the outer diameter. The magnetic steel is fan-shaped, which can effectively improve the performance of the axial motor; and the magnetic steel adopts a solution built into the magnetic unit, which improves the magnetic resistance torque component of the axial motor, so that the axial motor can still maintain a large power under high-speed conditions.

[0011] In a possible implementation, in the first permanent magnet, the first main body, the first subsection and the second subsection are independent structures, which is convenient for processing. Exemplarily, when the first permanent magnet is a magnetic steel, the magnetic steel has a large strength and is not easy to shape. In this embodiment, three independent structures are used to form a first permanent magnet in a "U" shape, which is convenient for processing.

[0012] In a possible implementation, the magnet unit further includes a second permanent magnet, a surface of the second soft magnet facing away from the first main body is provided with a groove, and the second permanent magnet is located in the groove. In this embodiment, the second permanent magnet and the first permanent magnet are used together to generate magnetic lines of force, increase magnetic flux, increase output torque, and improve motor performance.

[0013] In a possible implementation, the projection of the second permanent magnet on the first main body along the axial direction of the second support portion is located inside the first main body. In this embodiment, the second permanent magnet and the first main body are arranged as above, so that the circumferential size of the second permanent magnet is smaller than the circumferential size of the first main body, and when the second permanent magnet is closer to the air gap than the first main body, the area of ​​the magnetic force lines of the second permanent magnet is smaller than the area of ​​the magnetic force lines of the first main body, and the magnetic force lines gradually gather from the first main body to the direction of the air gap, which is conducive to increasing the magnetic density passing through the air gap.

[0014] In a possible implementation, the curvature of the second permanent magnet along the circumference of the second support portion is smaller than the curvature of the first main body along the circumference of the second support portion. The circumference of the second support portion is also the circumference of the motor shaft, or is also the circumference of the first support portion, or is also the circumference of the magnet structure. As shown in the figure, the curvature of the second permanent magnet along the circumference is smaller than the curvature of the first main body along the circumference, so that the magnet unit is more conducive to gathering magnetic lines of force, so that the magnetic flux entering the air gap is closer to a sine wave.

[0015] In a possible implementation, the first soft magnet and the second soft magnet are soft magnetic composite magnets. Soft magnetic composite magnets refer to magnets formed by processing soft magnetic composite materials, which can reduce high-frequency eddy current losses and increase application frequency, and the soft magnetic composite materials are easy to shape and can be processed into soft magnetic structures of desired shapes. For example, a groove can be processed in the second soft magnet, wherein the groove matches the shape of the second permanent magnet, so that the second permanent magnet can be accommodated in the groove, and the two sides of the second permanent magnet along the circumferential direction are abutted by the two side walls of the groove, which can improve the stability of the second permanent magnet along the circumferential direction.

[0016] In a possible implementation, the magnet unit further includes a third soft magnet, the second permanent magnet includes a second main body, a third sub-part, and a fourth sub-part, the third soft magnet is located on a side of the second main body away from the second soft magnet, and the third sub-part and the fourth sub-part are arranged on both sides of the second main body and the third soft magnet along the first direction. In this embodiment, the third sub-part and the fourth sub-part of the second permanent magnet protrude toward the air gap relative to the second main body, thereby improving the effect of gathering magnetic lines of force, thereby making the air gap magnetic flux waveform closer to a sine wave, thereby improving the air gap magnetic flux.

[0017] In a possible implementation, at least one of the first soft magnet, the second soft magnet and the third soft magnet is a soft magnetic composite magnet. A soft magnetic composite magnet refers to a magnet formed by processing a soft magnetic composite material, which can reduce high-frequency eddy current loss and increase the application frequency. The soft magnetic composite material is easy to shape and can be processed into a soft magnetic structure of a desired shape.

[0018] In a possible implementation, the magnet unit further includes a second soft magnet and a second permanent magnet, the first soft magnet, the first permanent magnet and the second soft magnet are stacked along the axial direction of the second support portion, a groove is provided on the surface of the second soft magnet facing away from the first permanent magnet, the second permanent magnet is located in the groove, and the projection of the second permanent magnet on the first permanent magnet along the axial direction of the second support portion is located in the first permanent magnet. In this embodiment, the cross-section of the first permanent magnet and the second permanent magnet is an "I"-shaped structure, the second permanent magnet is located in the groove of the second soft magnet, and the second permanent magnet is covered by the second soft magnet on both sides along the circumferential direction, so that the magnetic lines of force flowing out from both sides of the second permanent magnet along the circumferential direction can be gathered by the second soft magnet, thereby increasing the air gap magnetic density.

[0019] In a possible implementation, the rotor bracket further includes a plurality of positioning posts, each of which has two ends fixedly connected to the first support portion and the second support portion, respectively, and the positioning posts separate two adjacent magnet units, and a portion of the first support portion and a portion of the second support portion between the two adjacent positioning posts and the two connected positioning posts enclose a receiving space, and the magnet unit is located in the receiving space. In this embodiment, the positioning posts are used to fix the first support portion and the second support portion to improve the stability between the first support portion and the second support portion; in addition, the rotor bracket composed of the first support portion, the second support portion and the positioning posts is a bracket structure, which has more space, which is conducive to heat dissipation of the magnet structure.

[0020] In a possible implementation manner, the magnet unit may be bonded to the first support portion, the second support portion, and the positioning post by adhesive.

[0021] In a possible implementation, after the magnet unit is mounted on the rotor bracket, adhesive may be filled in the gap between the magnet unit and the rotor bracket to enhance the bonding strength and improve the structural reliability.

[0022] In a possible implementation, the rotor support further includes limiting ribs, which are located on both sides of the positioning column along the circumferential direction, and the limiting ribs are provided on the opposite surfaces of two adjacent positioning columns, and the limiting ribs are used to be inserted into the limiting grooves of the magnet unit, thereby improving the structural reliability of the magnet unit and the rotor support.

[0023] In a possible implementation, a through hole extending radially along the second support portion is provided in the positioning column, and the through hole is conducive to heat dissipation.

[0024] In a possible implementation, the rotor bracket is a non-magnetic bracket. A non-magnetic bracket can reduce magnetic leakage and magnetic flux loss, so that most of the magnetic flux of two adjacent magnet units flows into the winding coil of the stator, increasing the output torque. If a magnetic bracket is used, the magnetic bracket will cause part of the magnetic flux to be dispersed from the rotor bracket in the radial direction, thereby consuming part of the magnetic flux, which will affect the performance of the axial motor.

[0025] In a possible implementation, the size of the cross section of the second permanent magnet gradually decreases from the end close to the first main body to the end away from the first main body. The cross section of the second permanent magnet refers to the cross section obtained by cutting the second permanent magnet along the axial direction of the second support portion with an arc line with the same arc as the second permanent magnet. In this embodiment, the size of the cross section of the second permanent magnet gradually decreases from the end close to the first main body to the end away from the first main body, so that the size of the end close to the air gap side is smaller than the size of the end away from the air gap side, so that the magnetic lines of force are more concentrated to one side of the air gap, so that the air gap magnetic flux waveform is closer to a sine wave, and the air gap magnetic flux is improved.

[0026] In a possible implementation, the magnet unit further includes a third soft magnet, the second permanent magnet includes a second main body, a third sub-part, and a fourth sub-part, the third soft magnet is located on a side of the second main body away from the second soft magnet, and the third sub-part and the fourth sub-part are arranged on both sides of the second main body and the third soft magnet along the circumference of the second support part. In this embodiment, the cross-section of the first permanent magnet is an "I"-shaped structure, and the cross-section of the second permanent magnet is a "U"-shaped structure. The third sub-part and the fourth sub-part of the second permanent magnet protrude toward the air gap side relative to the second main body, thereby enhancing the effect of gathering magnetic lines of force, thereby making the air gap magnetic flux waveform closer to a sine wave, thereby enhancing the air gap magnetic flux.

[0027] In a possible implementation, in the second permanent magnet, the angle between the third section and the fourth section and the second main body is greater than 90°; in the first permanent magnet, the angle between the first section and the second section and the first main body is greater than 90°.

[0028] In a second aspect, the present application provides an axial motor, comprising a motor shaft, a stator and an axial motor rotor as described in any one of the above items, wherein the stator is mounted on the motor shaft and rotatably connected to the motor shaft, the axial motor rotor is mounted on the motor shaft and fixedly connected to the motor shaft, and the first soft magnet is located on a side of the first permanent magnet facing away from the stator.

[0029] In a possible implementation, the axial motor includes two axial motor rotors, both of which are mounted on the motor shaft and fixedly connected to the motor shaft, and the two axial motor rotors are located on both sides of the stator along the axial direction of the motor shaft.

[0030] In a third aspect, the present application provides a power assembly, including a gearbox and an axial motor as described above, wherein the axial motor is drivingly connected to a power input shaft in the gearbox for outputting power to the power input shaft.

[0031] In a fourth aspect, the present application provides a vehicle, comprising a vehicle body and the axial motor as described above, wherein the axial motor is mounted on the vehicle body.

[0032] In a possible implementation, the vehicle further includes wheels, wherein the wheels are mounted on the vehicle body, and the axial motor is drivingly connected to the wheels for driving the wheels to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0034] Figure 1 is an overall schematic diagram of an axial motor provided by an embodiment of the present application;

[0035] Figure 2 This application Figure 1 An exploded view of the axial motor is provided;

[0036] Figure 3a It is a structural schematic diagram of an axial motor rotor and a stator in an axial motor provided in an embodiment of the present application;

[0037] Figure 3b is a side view of an axial motor rotor and a stator in an axial motor provided in an embodiment of the present application;

[0038] Figure 4 is a schematic diagram of the structure of a powertrain provided in one embodiment of the present application;

[0039] Figure 5 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0040] Figure 6 is a schematic structural diagram of an axial motor rotor provided in an embodiment of the present application;

[0041] Figure 7 is a schematic structural diagram of an axial motor rotor provided in an embodiment of the present application;

[0042] Figure 8a It is a structural schematic diagram of a rotor support in an axial motor rotor provided in an embodiment of the present application;

[0043] Figure 8b This application Figure 8a A partial enlarged view of the middle M part;

[0044] Fig. 9 It is a partial schematic diagram of a magnet structure in an axial motor rotor provided by an embodiment of the present application;

[0045] Fig.10is a structural schematic diagram of a magnet unit provided in one embodiment of the present application;

[0046] Fig.11 is a schematic structural diagram of two magnet units provided in one embodiment of the present application;

[0047] Fig.12 It is a schematic diagram of the structure of a discontinuous magnet unit;

[0048] Fig.13 is a structural schematic diagram of a magnet unit provided in one embodiment of the present application;

[0049] Fig.14 It is a structural schematic diagram of a first main body and a second permanent magnet in a first permanent magnet in a magnet unit provided in an embodiment of the present application;

[0050] Fig.15 is a magnetic circuit diagram of an axial motor provided in one embodiment of the present application;

[0051] Fig.16 This is an air gap magnetic flux waveform diagram of an axial motor provided by an embodiment of the present application;

[0052] Fig.17 This is the air gap flux density waveform of an axial motor using only magnetic steel;

[0053] Fig.18 is a schematic diagram of a magnet unit provided in one embodiment of the present application;

[0054] Fig.19 is a schematic structural diagram of a magnet unit in an axial motor rotor provided in an embodiment of the present application;

[0055] Fig. 20 is a magnetic circuit diagram of an axial motor rotor provided in one embodiment of the present application;

[0056] Fig.21 is a schematic structural diagram of a magnet unit in an axial motor rotor provided in an embodiment of the present application;

[0057] Fig. 22 is a magnetic circuit diagram of an axial motor rotor provided in one embodiment of the present application;

[0058] Fig.23 is a schematic structural diagram of a magnet unit in an axial motor rotor provided in an embodiment of the present application;

[0059] Fig.24 It is a magnetic circuit diagram of a magnet unit of two pairs of poles in an axial motor rotor provided by an embodiment of the present application;

[0060] Fig.25 is a schematic structural diagram of a magnet unit in an axial motor rotor provided in an embodiment of the present application;

[0061] Fig.26 It is a magnetic circuit diagram of a magnet unit of two pairs of poles in an axial motor rotor provided by an embodiment of the present application;

[0062] Fig. 27 is a schematic structural diagram of a magnet unit in an axial motor rotor provided in an embodiment of the present application;

[0063] Fig.28 This is a magnetic circuit diagram of a magnet unit with two pairs of poles in an axial motor rotor provided in an embodiment of the present application. DETAILED DESCRIPTION

[0064] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0065] In this document, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0066] In addition, in this article, directional terms such as "upper" and "lower" are defined relative to the orientation of the structure schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to the change of the orientation of the structure.

[0067] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0068] Soft magnetic composite material: SMC, the full name is soft magnetic composite. Soft magnetic composite material refers to a soft magnetic material formed by evenly dispersing magnetic particles in non-magnetic materials.

[0069] The present application provides an axial motor rotor, including a rotor support and a magnet structure, wherein the rotor support includes a first support portion and a second support portion that are coaxially arranged, the first support portion being sleeved on a side of the second support portion away from the axis of the second support portion; the magnet structure includes a plurality of magnet units, the plurality of magnet units being arranged in sequence along the circumference of the second support portion, and each of the plurality of magnet units being located between the first support portion and the second support portion, the magnet units being respectively fixed to the first support portion and the second support portion at both ends along the radial direction of the second support portion, the magnet unit including a first soft magnet and a first permanent magnet, and at least part of the first soft magnet and at least part of the first permanent magnet being stacked along the axial direction of the second support portion. The present application forms a magnet structure by arranging a plurality of magnet units in a surrounding manner, wherein each magnet unit is a part of an annular magnet structure. Compared with the magnet structure which is annular as a whole, the processing technology of each magnet unit is simpler. In the present application, each magnet unit includes a first soft magnet and a first permanent magnet which are stacked, wherein the first soft magnet is used to gather magnetic lines of force, provide a path for the magnetic lines of force, improve the air gap magnetic density, increase the output torque, and reduce the torque fluctuation. When the axial motor rotor of the present application is used in an axial motor, the performance of the axial motor can be improved.

[0070] See also Figure 1 and Figure 2 , Figure 1 An overall schematic diagram of an axial motor 1 provided in an embodiment of the present application, Figure 2 For this application Figure 1 An exploded diagram of an axial motor 1 is provided. The axial motor 1 includes an axial motor rotor 10, a motor shaft 11 and a stator 12, wherein the stator 12 is mounted on the motor shaft 11 and is rotationally connected to the motor shaft 11, and the axial motor rotor 10 is mounted on the motor shaft 11 and is fixedly connected to the motor shaft 11. When alternating current is passed through the armature winding of the stator 12, the generated alternating magnetic flux interacts with the permanent magnetic flux generated by the axial motor rotor 10, so that the axial motor rotor 10 rotates relative to the stator 12. The axial motor rotor 10 is fixedly connected to the motor shaft 11, so that the motor shaft 11 rotates following the axial motor rotor 10, and the stator 12 is rotationally connected to the motor shaft 11, so that the motor shaft 11 can rotate relative to the stator 12. When the axial motor 1 is working, the stator 12 is stationary, and the axial motor rotor 10 and the motor shaft 11 rotate synchronously. The output end of the motor shaft 11 is used to drive external components to rotate.

[0071] In a possible implementation, the axial motor 1 further includes a housing 13 and an end cover 14 (eg, Figure 2 As shown in FIG. 1 , the housing 13 is located outside the stator 12, and the end cover 14 is located on the side of the axial motor rotor 10 away from the stator 12. The end cover 14 is fixed to the housing 13, and the axial motor rotor 10 is located between the end cover 14 and the stator 12.

[0072] In a possible implementation, the axial motor 1 includes two axial motor rotors 10, both of which are mounted on the motor shaft 11 and fixedly connected to the motor shaft 11, and the two axial motor rotors 10 are located on both sides of the stator 12 along the axial direction of the motor shaft 11. The two axial motor rotors 10 improve the working efficiency of the axial motor 1. In this embodiment, the axial motor 1 includes two end covers 14, such as Figure 2 As shown, two end covers 14 and the housing 13 enclose a receiving space, and two axial motor rotors 10 and a stator 12 are located in the receiving space.

[0073] In a possible implementation, the motor shaft 11 includes a first motor half shaft 11a and a second motor half shaft 11b, wherein the first motor half shaft 11a and the second motor half shaft 11b are fixedly connected, and a first fixed disk 15 is provided on the first motor half shaft 11a, and the first fixed disk 15 is used to be fixedly connected to one of the axial motor rotors 10. Exemplarily, the first fixed disk 15 and the axial motor rotor 10 can be connected by screws; a bearing 16 is provided on the second motor half shaft 11b, and the stator 12 is sleeved on the motor shaft 11 through the bearing 16, wherein the stator 12 is rotatably connected to the motor shaft 11 through the bearing 16, and a second fixed disk 17 is also provided on the second motor half shaft 11b, and the second fixed disk 17 is used to be fixedly connected to another axial motor rotor 10. Exemplarily, the second fixed disk 17 and the axial motor rotor 10 can be connected by screws.

[0074] In some embodiments, the motor shaft 11 may also be an integral body, and a first fixing plate 15 , a bearing 16 and a second fixing plate 17 are provided on the motor shaft 11 .

[0075] In a possible implementation, the axial motor 1 includes an axial motor rotor 10 and a stator 12 .

[0076] In a possible implementation, the axial motor 1 includes an axial motor rotor 10 and two stators 12 . Along the axial direction of the motor shaft 11 , the two stators 12 are distributed on both sides of the axial motor rotor 10 .

[0077] In a possible implementation, the axial motor 1 includes a plurality of axial motor rotors 10 and a plurality of stators 12, which are alternately arranged in sequence along the axial direction of the motor shaft 11. Exemplarily, the axial motor 1 includes three axial motor rotors 10 and two stators 12.

[0078] In a possible implementation, the stator 12 may be a wound winding stator or a distributed winding stator. The wound winding stator refers to a stator core including a plurality of stator cores distributed around the motor shaft 11, and a winding is wound on each stator core to form a wound winding. Figure 2 The stator 12 shown is a wound winding stator. A distributed winding stator refers to a stator core that is arranged around the motor shaft 11 as a whole. The stator core is an integral structure, and winding grooves are punched on the stator core and the windings are wound in the winding grooves to form a distributed winding.

[0079] See also Figure 3a and Figure 3b , Figure 3a This is a schematic diagram of the structure of an axial motor rotor 10 and a stator 12 provided in an embodiment of the present application. Figure 3b for Figure 3a In this embodiment, there is an air gap Q between the stator 12 and the axial motor rotor 10, and the magnetic lines of force L generated in the axial motor rotor 10 enter the stator 12 through the air gap Q. In this embodiment, the gaps between the two axial motor rotors 10 and the stator 12 form two air gaps Q.

[0080] The axial motor 1 adopts the axial motor rotor 10 of the present application, and forms a magnet structure by arranging multiple magnet units in a circle. Each magnet unit is a part of the annular magnet structure. Compared with the magnet structure that is annular as a whole, the processing technology of each magnet unit is simpler; and each magnet unit includes a first soft magnet and a first permanent magnet that are stacked, wherein the first soft magnet is used to gather magnetic lines of force, and the first soft magnet is also used to provide a path for the magnetic lines of force, thereby increasing the air gap magnetic density, increasing the output torque, and reducing torque fluctuations, thereby improving the performance of the axial motor 1.

[0081] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of a powertrain 3 provided in an embodiment of the present application, wherein the powertrain 3 includes a gearbox 31 and the axial motor 1 as described above, wherein the axial motor 1 is transmission-connected to a power input shaft 32 in the gearbox 31 for outputting power to the power input shaft 32. In this embodiment, the gearbox 31 and the axial motor 1 in the powertrain 3 may be separate or integrated.

[0082] In a possible implementation, a wheel drive shaft (not shown) is provided in the gearbox 31, and the wheel drive shaft provides power to the wheel after receiving the power output by the axial motor 1. In this embodiment, a gear component is provided in the gearbox 31 to realize the power transmission between the axial motor 1 and the wheel drive shaft.

[0083] In a possible implementation, the powertrain 3 further includes an engine 33 and a generator 34. The engine 33 is connected to another power input shaft in the gearbox 31 for outputting power to the other power input shaft. The generator 34 is connected to the engine 33 through a gear component in the gearbox 31. The power output by the engine 33 is transmitted to the generator 34 through the gearbox 31. The generator 34 generates electricity and is used to store electrical energy in the power battery to charge the power battery. It should be noted that Figure 4 The powertrain 3 provided in the figure includes an engine 33 and a generator 34. The powertrain 3 is a hybrid power system. In some embodiments, the engine 33 and the generator 34 may not be provided, and only the axial motor 1 and the gearbox 31 are included. In this case, the powertrain 3 is a pure electric power system.

[0084] In a possible implementation, the powertrain 3 further includes at least one of MCU, OBC, DC-DC, PDU and BCU. MCU is a motor controller, which is called Motor Control Unit in English; OBC is an on-board charger, which is called On-Board Charger in English; DC-DC is a direct current converter; PDU is a power distribution unit, which is called Power Distribution Unit in English; BCU is a battery control unit, which is called Battery Control Unit in English. The powertrain 3 can integrate at least one of the above components as needed.

[0085] See also Figure 5 An embodiment of the present application provides a vehicle 2 , which includes a vehicle body 21 and the above-mentioned axial motor 1 , wherein the axial motor 1 is mounted on the vehicle body 21 .

[0086] The vehicle 2 includes a car, a robot or other forms of driving equipment, wherein the vehicle includes an electric vehicle / electric vehicle (EV), a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle, etc. In some embodiments, the vehicle includes a passenger car, various special operation vehicles with specific functions, such as an engineering rescue vehicle, a watering truck, a sewage suction truck, a cement mixer truck, a crane truck, a medical vehicle, etc.

[0087] For example, Figure 5 As shown, the vehicle 2 is a car, and the vehicle 2 also includes wheels 22, which are mounted on the vehicle body 21, and the axial motor 1 is connected to the wheels 22 for driving the wheels 22 to drive the vehicle to travel. In some embodiments, the vehicle 2 is provided with a powertrain 3 as described above, which is mounted on the vehicle body 21 and is used to drive the vehicle 2 to travel.

[0088] The axial motor rotor of the present application is described in detail below.

[0089] See also Figure 6 , Figure 7 and Figure 8a , Figure 6 This is a schematic diagram of the structure of the axial motor rotor 10 provided in the first embodiment of the present application. Figure 7 for Figure 6 A schematic diagram of the axial motor rotor 10 as seen from the side facing away from the stator 12, Figure 8a for Figure 6 Schematic diagram of the structure of the rotor support 100. In this embodiment, the axial motor rotor 10 includes a rotor support 100 and a magnet structure 200. The rotor support 100 includes a first support portion 110 and a second support portion 120 that are coaxially arranged, and the first support portion 110 is sleeved on a side of the second support portion 120 that is away from the axis of the second support portion 120 (such as Figure 8a As shown); the magnet structure 200 includes a plurality of magnet units 210 (as Figure 6 As shown), the plurality of magnet units 210 are sequentially arranged along the circumferential direction C of the second support portion 120, and each of the plurality of magnet units 210 is located between the first support portion 110 and the second support portion 120 (as shown). Figure 7 As shown), the two ends of the magnet unit 210 along the radial direction R of the second support part 120 are respectively fixed to the first support part 110 and the second support part 120, and the magnet unit 210 includes a first soft magnet 211 and a first permanent magnet 212 (as shown Fig. 9 , Fig.10 and Fig.11 As shown), at least part of the first soft magnetic body 211 and at least part of the first permanent magnet 212 are stacked along the axial direction of the second support portion 120.

[0090] The first support portion 110 and the second support portion 120 are in annular shape and are used to be sleeved on the motor shaft 11 and fixedly connected to the motor shaft 11. For example, a support fixing plate 121 is provided on the inner side of the second support portion 120, and the support fixing plate 121 is fixedly connected to the first fixing plate 15 on the motor shaft 11 by screws (such as Figure 2 shown).

[0091] In this embodiment, the axis of the second support portion 120 coincides with the axis of the motor shaft 11, the axial direction O of the second support portion 120 coincides with the axial direction of the motor shaft 11, and the extension direction of the axis of the second support portion 120 is the axial direction O of the second support portion 120, wherein the radial direction R of the second support portion 120 is the same as the radial direction of the motor shaft 11.

[0092] In this embodiment, a plurality of magnet units 210 are arranged in sequence along the circumferential direction C of the second support portion 120, wherein the circumferential direction C of the second support portion 120 refers to the direction surrounding the second support portion 120, and a plurality of magnet units 210 are arranged around the second support portion 120, and each magnet unit 210 is respectively fixed to the first support portion 110 and the second support portion 120 at both ends along the radial direction R of the second support portion 120, so that each magnet unit 210 is stably fixed between the first support portion 110 and the second support portion 120. Among them, the first support portion 110 and the second support portion 120 are spaced apart, and the space between the two is used to accommodate the magnet unit 210. In this application, the rotor bracket 100 limits and fixes the two ends of the magnet unit 210 along the radial direction R by two annular support portions 110 and 120. The rotor bracket 100 has a simple structure and saves space, so that the saved space can be used to fill the magnet unit 210, which is conducive to increasing the volume of the magnet unit 210, thereby facilitating the increase of the magnetic density, thereby improving the performance of the axial motor 1. Among them, the performance indicators of the axial motor include torque constant, back-electromotive force coefficient, permanent magnet usage, torque output, AC and DC axis inductance and other performance indicator parameters.

[0093] In this embodiment, a plurality of magnet units 210 surround the second support portion 120 to form an annular magnet structure 200, and each magnet unit 210 only occupies a portion of the annular magnet structure 200. Compared with the magnet structure that is annular as a whole, the magnet structure 200 formed by the plurality of magnet units 210 surrounding and splicing is simpler to process. For the magnet structure 200 that is annular as a whole, it needs to be sleeved on the motor shaft 11, and the inner wall of the overall annular magnet structure 200 needs to be processed into a circle in order to be well installed with the motor shaft 11, but it is generally difficult to make it into a circle, and the process accuracy is difficult to achieve. If the accuracy is not enough, the inner wall of the magnet structure 200 does not match the motor shaft 11, and the connection reliability between the axial motor rotor 10 and the motor shaft 11 deteriorates, thereby making the overall reliability of the axial motor 1 deteriorate and easy to be damaged. In the present application, the processing technology for each magnet unit 210 is simpler. The two ends of each magnet unit 210 along the radial direction R are arc-shaped. The arc shape is easier to process than the circle and has higher processing accuracy. The size of each magnet unit 210 can be the same. After the magnet unit 210 is processed, multiple magnet units 210 are spliced ​​around the first support part 110 and the second support part 120, wherein the size of the first support part 110 and the second support part 120 can be set according to the size of the magnet structure 200. It can be seen from this that the magnet structure 200 formed by multiple magnet units 210 surrounding the second support part 120 in the present application is easier to process and has higher processing accuracy, which is conducive to improving the reliability of the axial motor 1.

[0094] See also Fig. 9 , Fig.10 and Fig.11 ,in Fig. 9 is a partial schematic diagram of the magnet structure 200, Fig.10 is a schematic structural diagram of the magnet unit 210, Fig.11 Schematic diagram of the magnet unit 210 viewed from the side away from the axis. In this embodiment, each magnet unit 210 includes a first soft magnet 211 and a first permanent magnet 212 stacked at least partially along the axial direction O of the second support portion 120. The first soft magnet 211 facilitates the flow of magnetic lines of force L and provides a smooth flow path for the magnetic lines of force L. When the first soft magnet 211 is located on the side of the first permanent magnet 212 away from the air gap Q (such as Fig.11 As shown, the magnetic lines of force L flowing outward from the first permanent magnet 212 can flow into the first permanent magnet 212 in the adjacent magnet unit 210 through the first soft magnet 211. Compared with the magnetic lines of force L of the first permanent magnet 212 flowing into the first permanent magnet 212 in the connected magnet unit 210 through the air, the first soft magnet 211 is more conducive to the flow of the magnetic lines of force L than the air, thereby reducing the magnetic flux loss.

[0095] In a possible implementation, two adjacent magnet units 210 are a pair of polar magnet units, wherein the magnetization directions of the first permanent magnets 212 in the two adjacent magnet units 210 are opposite, so that the magnetic fluxes of the two adjacent magnet units 210 form a loop.

[0096] In one embodiment, the first permanent magnet 212 is also called magnetic steel. Commonly used permanent magnetic materials are divided into aluminum-nickel-cobalt permanent magnetic alloys, iron-chromium-cobalt permanent magnetic alloys, permanent magnetic ferrites, rare earth permanent magnetic materials (neodymium iron boron Nd2Fe14B) and composite permanent magnetic materials, etc.

[0097] See again Figure 6 and Figure 7 In a possible implementation, the circumferential dimension of the magnet unit 210 gradually increases from the end close to the second support portion 120 to the end away from the second support portion 120. Since the second support portion 120 is located on the inner side and the first support portion 110 is located on the outer side, the circumferential dimension of the first support portion 110 is greater than the circumferential dimension of the second support portion 120, so that the space between the first support portion 110 and the second support portion 120 gradually increases from the area close to the second support portion 120 to the area close to the first support portion 110. In this embodiment, the magnet unit 210 is arranged as above, so that the magnet unit 210 is fan-shaped, so as to be able to adapt to the space between the first support portion 110 and the second support portion 120, so that the magnet unit 210 fills a larger area between the first support portion 110 and the second support portion 120, fully utilizing the internal space of the rotor bracket 100, increasing the area of ​​the magnet unit 210, improving the magnetic density, and increasing the output torque.

[0098] In a possible implementation, the first permanent magnet 212 is continuous along the radial direction of the second support portion 120. If the first permanent magnet 212 is discontinuous along the radial direction of the second support portion 120, such as Fig.12 As shown, the permanent magnet includes three sub-magnet units 201 / 202 / 203 distributed in the radial direction. The permanent magnet generally has a high structural strength and is difficult to process. For example, if the permanent magnet is magnetic steel, it is difficult to align the surfaces of the three permanent magnets along the circumferential direction C on both sides, and the processing cost is high. If the surfaces of the three permanent magnets along the circumferential direction C on both sides are not aligned (such as Fig.12As shown), the space of the rotor bracket 100 will be wasted, the filling amount of the permanent magnet will be reduced, and the performance of the axial motor 1 will be reduced; and the three sub-magnet units require three sets of stamping dies, the amount of magnetic steel molds is relatively large, and in order to ensure the coaxiality of the inner and outer arc walls of the three sub-magnet units, the processing accuracy is required to be high, which makes the processing technology complicated. In this embodiment, the first permanent magnet 212 is continuous along the radial direction R of the second support part 120, and the continuous integral structure in the radial direction R can align the surfaces of the first permanent magnet 212 on both sides of the circumferential direction C, which is not only simple to process, but also conducive to increasing the volume of the magnet unit 210 and improving the magnetic density.

[0099] In a possible implementation, the projection of the first permanent magnet 212 on the first soft magnetic body 211 along the axial direction O of the second support portion 120 is located inside the first soft magnetic body 211 (eg, Fig.11 As shown). In the configuration of this embodiment, the circumferential dimension of the first soft magnet 211 is larger than the circumferential dimension of the first permanent magnet 212, which is beneficial to gather the magnetic flux lines L and facilitate magnetic conductivity. In this embodiment, the area of ​​the maximum surface of the first permanent magnet 212 is smaller than the area of ​​the maximum surface of the first soft magnet 211, so that most or all of the magnetic lines L flowing out of the first permanent magnet 212 can enter the first soft magnet 211, and be gathered through the first soft magnet 211, and flow into the adjacent magnet unit 210 through the first soft magnet 211. Among them, the maximum surface of the first soft magnet 211 and the maximum surface of the first permanent magnet 212 are perpendicular to the axial direction O of the second support portion 120.

[0100] Please continue reading Fig.10 and Fig.11 In a possible implementation, the magnet unit 210 further includes a second soft magnet 213, the first permanent magnet 212 includes a first main body 2121, a first sub-part 2122 and a second sub-part 2123, the first soft magnet 211, the first main body 2121 and the second soft magnet 213 are stacked along the axial direction O of the second support part 120, and the first sub-part 2122 and the second sub-part 2123 are arranged on both sides of the first main body 2121 and the second soft magnet 213 along the circumferential direction C of the second support part 120. Fig.13As shown, in the present embodiment, the first soft magnet 211 and the second soft magnet 213 are respectively arranged on both sides of the first permanent magnet 212 along the axial direction O, so that the magnetic lines of force L on both sides of the first permanent magnet 212 along the axial direction O are gathered by the soft magnets, thereby increasing the air gap magnetic flux density. In the present embodiment, the arrangement of the first subdivision 2122 and the second subdivision 2123 is conducive to gathering the magnetic lines of force L. When the first subdivision 2122 and the second subdivision 2123 protrude toward one side of the air gap Q, the magnetic lines of force L converge into the winding coil on the stator 12, so that the air gap magnetic flux waveform is close to a sine wave, which can increase the output torque and reduce the torque fluctuation. In the present embodiment, the cross-section of the first permanent magnet 212 is a "U" shape (such as Fig.13 shown).

[0101] In a possible implementation, the first permanent magnet 212 is a magnetic steel, wherein the circumferential dimension of the first main body 2121 gradually increases from the end close to the second support portion 120 to the end away from the second support portion 120. The first main body 2121 is fan-shaped, wherein the first main body 2121 is also a magnetic steel, and the magnetic steel is fan-shaped, which can fully utilize the space in the rotor bracket 100, and will not cause the magnet unit 210 occupied by the magnetic steel at the outer diameter to be small in size and cause insufficient motor performance. The magnetic steel is fan-shaped, which can effectively improve the performance of the axial motor; and the magnetic steel adopts a solution built into the magnet unit 210, which improves the magnetic resistance torque component of the axial motor 1, so that the axial motor 1 can still maintain a large power under high-speed conditions.

[0102] In a possible implementation, the magnetization direction of the first main body 2121 is the same as the axial direction O of the second support portion 120, and the magnetization directions of the first sub-part 2122 and the second sub-part 2123 intersect with the axial direction O of the second support portion 120. The magnetic lines of force L in the first sub-part 2122 and the second sub-part 2123 flow in or out from the middle of the two, and the magnetic lines of force L flowing in or out from the middle of the first sub-part 2122 and the second sub-part 2123 attract the magnetic lines of force flowing in or out of the first main body 2121 to be more concentrated, thereby making the magnetic flux waveform passing through the air gap close to a sine wave, which can increase the output torque and reduce the torque fluctuation. In this embodiment, the magnetization direction of the first main body 2121 is perpendicular to the maximum surface of the first main body 2121, the magnetization direction of the first sub-part 2122 is perpendicular to the maximum surface of the first sub-part 2122, and the magnetization direction of the second sub-part 2123 is perpendicular to the maximum surface of the second sub-part 2123.

[0103] In a possible implementation, in the first permanent magnet 212, the first main body 2121, the first subsection 2122 and the second subsection 2123 are independent structures, which is convenient for processing. For example, when the first permanent magnet 212 is a magnetic steel, the magnetic steel has a large strength and is not easy to shape. In this embodiment, three independent structures are used to form the first permanent magnet 212 in a "U" shape, which is convenient for processing.

[0104] Please continue reading Fig.13 In a possible implementation, the magnet unit 210 further includes a second permanent magnet 214, a surface of the second soft magnet 213 facing away from the first main body 2121 is provided with a groove 2131, and the second permanent magnet 214 is located in the groove 2131. In this embodiment, the second permanent magnet 214 and the first permanent magnet 212 are used together to generate magnetic lines of force L, increase magnetic flux, increase output torque, and improve motor performance.

[0105] In one embodiment, the magnetization direction of the second permanent magnet 214 is perpendicular to the maximum surface of the second permanent magnet 214, or the magnetization direction of the second permanent magnet 214 is axial O. In one embodiment, the first main body 2121 and the second permanent magnet 214 are axially magnetized permanent magnets, and the first sub-portion 2122 and the second sub-portion 2123 are tangentially magnetized permanent magnets.

[0106] In a possible implementation, the first soft magnetic body 211 and the second soft magnetic body 213 are soft magnetic composite magnets. Soft magnetic composite magnets refer to magnets formed by processing soft magnetic composite materials, which can reduce high-frequency eddy current losses and increase the application frequency. In addition, the soft magnetic composite material is easy to shape and can be processed into a soft magnetic structure of a desired shape. For example, the second soft magnetic body 213 can be processed into a groove 2131 (such as Fig.11 As shown), the groove 2131 matches the shape of the second permanent magnet 214, so that the second permanent magnet 214 can be accommodated in the groove 2131, and the second permanent magnet 214 is abutted on both sides of the circumferential direction C by the two side walls of the groove 2131, which can improve the stability of the second permanent magnet 214 on both sides of the circumferential direction C.

[0107] In a possible implementation, the first permanent magnet 212 and the second permanent magnet 214 are magnetic steel.

[0108] In a possible implementation, the projection of the second permanent magnet 214 on the first main body 2121 along the axial direction O of the second support portion 120 is located inside the first main body 2121 (eg, Fig.13As shown). In the present embodiment, the second permanent magnet 214 and the first main body 2121 are arranged as above, so that the size of the second permanent magnet 214 along the circumferential direction C is smaller than the size of the first main body 2121 along the circumferential direction C. When the second permanent magnet 214 is closer to the air gap Q than the first main body 2121, the area of ​​the magnetic force lines of the second permanent magnet 214 is smaller than the area of ​​the magnetic force lines L of the first main body 2121, and the magnetic force lines L gradually gather from the first main body 2121 to the direction of the air gap Q, which is conducive to increasing the magnetic flux density passing through the air gap Q. In the present embodiment, the maximum surface of the second permanent magnet 214 is smaller than the maximum surface of the first main body 2121, and the maximum surface of the second permanent magnet 214 and the maximum surface of the first main body 2121 both intersect with the axial direction O of the second support portion 120.

[0109] See also Fig.14 In a possible implementation, the curvature of the second permanent magnet 214 along the circumferential direction C of the second support portion 120 is smaller than the curvature of the first main body 2121 along the circumferential direction C of the second support portion 120. The circumferential direction C of the second support portion 120 is also the circumferential direction of the motor shaft 11, or the circumferential direction of the first support portion 110, or the circumferential direction of the magnet structure 200. Fig.13 As shown, the arc of the second permanent magnet 214 along the circumferential direction C is γ1, and the arc of the first main body 2121 along the circumferential direction C is γ2, wherein γ1 is smaller than γ2, so that the magnet unit 210 is more conducive to gathering magnetic lines of force, making the magnetic flux entering the air gap Q closer to a sine wave.

[0110] In one embodiment, the dimensional parameters of each part in the magnet unit 210 can be adjusted as needed, for example, the thickness, curvature, radial size and other parameters of the first permanent magnet 212 and the first main body 2121 can be set, as well as the thickness, radial size and width and other parameters of the first section 2122 and the second section 2123 can be set, and the thickness, curvature, radial size and other parameters of the first soft magnet 211 and the second soft magnet 213 can be set, so that the axial motor 1 has better performance, for example, the required permanent magnet usage, torque output, AC and DC axis inductance and other performance indicators can be obtained.

[0111] See also Figure 8a and Figure 8b , Figure 8a This is a schematic structural diagram of a rotor support 100 provided in an embodiment of the present application. Figure 8b for Figure 8aA partial enlarged view of the M portion in the figure. In a possible implementation, the rotor bracket 100 further includes a plurality of positioning posts 130, and both ends of each of the plurality of positioning posts 130 are fixedly connected to the first support portion 110 and the second support portion 120, respectively. The positioning posts 130 separate two adjacent magnet units 210, and a portion of the first support portion 110 and a portion of the second support portion 120 between two adjacent positioning posts 130 and two connected positioning posts 130 enclose a receiving space 140, and the magnet unit 210 is located in the receiving space 140. In this embodiment, the positioning posts 130 are used to fix the first support portion 110 and the second support portion 120, and to enhance the stability between the first support portion 110 and the second support portion 120; in addition, the rotor bracket 100 composed of the first support portion 110, the second support portion 120 and the positioning posts 130 is a bracket structure, which has more space, and is conducive to heat dissipation of the magnet structure 200.

[0112] In a possible implementation, the magnet unit 210 may be bonded to the first support portion 110 , the second support portion 120 , and the positioning post 130 by using adhesive.

[0113] In a possible implementation, after the magnet unit 210 is mounted on the rotor bracket 100 , adhesive may be filled in the gap between the magnet unit 210 and the rotor bracket 100 to enhance the bonding strength and improve the structural reliability.

[0114] In a possible implementation, the rotor support 100 further includes a limiting rib 150, which is located on both sides of the positioning column 130 along the circumferential direction C. The limiting rib 150 is provided on the opposite surfaces of two adjacent positioning columns 130, and the limiting rib 150 is used to be inserted into the limiting groove 230 of the magnet unit 210 (such as Fig.13 As shown), the structural reliability of the magnet unit 210 and the rotor bracket 100 is thereby improved.

[0115] For details, please refer to Fig.13 In this embodiment, in the axial direction O, there is a gap between the first section 2122 of the first permanent magnet 212 and the first soft magnetic body 211, and the first section 2122, the first soft magnetic body 211 and the first main body 2121 are arranged to form a limiting groove 230, and the limiting rib 150 is inserted into the limiting groove 230.

[0116] In other embodiments, other limiting structures may be further provided on the surfaces of the positioning column 130 , the first support portion 110 , and the second support portion 120 facing the receiving space 140 to position the magnet unit 210 and improve the structural reliability of the magnet unit 210 and the rotor bracket 100 .

[0117] In a possible implementation, the rotor bracket 100 is a non-magnetic bracket. The non-magnetic bracket can reduce magnetic leakage and magnetic flux loss, so that most of the magnetic flux of two adjacent magnet units 210 flows into the winding coil of the stator 12, increasing the output torque. If a magnetic bracket is used, the magnetic bracket will cause part of the magnetic flux to be dispersed from the rotor bracket 100 along the radial direction R, thereby consuming part of the magnetic flux, which will affect the performance of the axial motor 1.

[0118] Please continue reading Figure 8b In a possible implementation, a through hole 131 extending along the radial direction R of the second support portion 120 is provided in the positioning column 130. The through hole 131 is conducive to heat dissipation.

[0119] See also Fig.15 , Fig.15 This is a magnetic circuit diagram of the axial motor 1 provided in the first embodiment of the present application. In order to clearly illustrate the magnetic circuit diagram, Fig.15 The first soft magnetic body 211 and the second soft magnetic body 213 are omitted. In this embodiment, the axial motor 1 includes two axial motor rotors 10, wherein the structure of the magnet unit 210 in each axial motor rotor 10 is as follows: Fig. 9 , Fig.10 , Fig.11 as well as Fig.13 In this embodiment, the magnet unit 210 includes a first soft magnet 211, a first permanent magnet 212, a second soft magnet 213 and a second permanent magnet 214, wherein the first permanent magnet 212 includes a first main body 2121, a first subsection 2122 and a second subsection 2123, the size of the second permanent magnet 214 along the circumferential direction C is smaller than the size of the first main body 2121 along the circumferential direction C, and the first subsection 2122 and the second subsection 2123 protruding toward the air gap Q are arranged on both sides of the first main body 2121, and the magnet unit 210 with a magnetic field gathering effect composed of the first permanent magnet 212 and the second permanent magnet 214 makes the generated magnetic lines of force L gather and enter the air gap Q, so that the magnetic field waveform of the air gap Q is close to a sine wave, which can increase the output torque and reduce the torque fluctuation.

[0120] exist Fig.15 In FIG. 1 , a magnetic circuit diagram of a pair of pole magnet units 210 and a stator 12 in two axial motor rotors 10 is shown. Fig.15The two magnet units 210 in the axial motor rotor 10 in the upper part are a pair of pole magnet units, namely magnet unit 210a and magnet unit 210d, wherein the magnetization directions of magnet unit 210a and magnet unit 210d are opposite. Specifically, the magnetization directions of the first main body 2121 in the first permanent magnet 212 in magnet unit 210a and the second permanent magnet 214 in magnet unit 210a are the same, and the magnetization directions of the first main body 2121 in the first permanent magnet 212 in magnet unit 210d and the second permanent magnet 214 in magnet unit 210d are the same, but the magnetization directions of the first main body 2121 in the first permanent magnet 212 in magnet unit 210a and magnet unit 210d are opposite. The magnetization directions of the second permanent magnet 214 in the magnet unit 210a and the magnet unit 210d are opposite; the magnetization directions of the first section 2122 in the first permanent magnet 212 in the magnet unit 210a and the first section 2122 in the first permanent magnet 212 in the magnet unit 210d are opposite, and the magnetization directions of the second section 2123 in the first permanent magnet 212 in the magnet unit 210a and the second section 2123 in the first permanent magnet 212 in the magnet unit 210d are opposite.

[0121] exist Fig.15 The two magnet units 210 in the axial motor rotor 10 below are a pair of polar magnet units, namely magnet unit 210b and magnet unit 210c, wherein the magnetization directions of magnet unit 210b and magnet unit 210c are opposite. The magnetization directions of magnet unit 210b and magnet unit 210c can be understood by referring to the magnetization directions of magnet unit 210a and magnet unit 210d, which will not be repeated here.

[0122] When the winding coil in the stator 12 is energized, the generated magnetic lines of force interact with the magnetic lines of force in the magnet unit 210 to drive the axial motor rotor 10 to rotate. Fig.15 In the figure, the direction of one magnetic circuit diagram is: magnet unit 210a, magnet unit 210b, magnet unit 210c and magnet unit 210d, the magnetic lines of force L generated by the winding coils of the stator 12 pass through the air gap Q and enter the magnet unit 210b through the air gap Q, and enter the adjacent magnet unit 210c through the first soft magnet 211 outside the magnet unit 210b, the magnetic lines of force L generated by the magnet unit 210c enter the winding coils of the stator 12 through the air gap Q, the magnetic lines of force L generated by the winding coils of the stator 12 enter the magnet unit 210d through the air gap Q, and enter the adjacent magnet unit 210a through the first soft magnet 211 outside the magnet unit 210d, forming a magnetic circuit loop.

[0123] The air gap magnetic flux waveform in this embodiment is as follows: Fig.16 As shown, Fig.16 The horizontal axis represents the electrical angle, the unit of which is °, and the vertical axis represents the magnetic flux density (B), the unit of which is T. Fig.16 It can be seen that the waveform is close to a sine wave, and the magnetic flux density on both sides of the waveform is lower than the middle magnetic flux density, wherein the peak magnetic flux density of the waveform reaches 1.15T. It can be seen that the magnet unit 210 with a magnetic field focusing effect in this embodiment can make the air gap magnetic flux density waveform close to a sine wave, thereby increasing the output torque and reducing torque fluctuations.

[0124] See also Fig.17 , Fig.17 It is the magnetic density waveform of the magnetic steel as the magnet unit of the rotor. In this scheme, the rotor only contains magnetic steel, no soft magnet, and only one magnetic steel sheet. Fig.17 It can be seen that the air gap flux density waveform is closer to a square wave, which reduces the output torque and the performance of the axial motor 1. Fig.17 The peak magnetic density is 0.69T, which is less than Fig.15 It can be seen from this that the axial motor rotor 10 in the first embodiment can increase the air gap peak magnetic flux density by more than 30%.

[0125] See also Fig.18 , Fig.18 This is a schematic diagram of the structure of the axial motor rotor 10 provided in the second embodiment of the present application. In this embodiment, unlike the first embodiment, the size of the cross-section of the second permanent magnet 214 gradually decreases from the end close to the first main body 2121 to the end away from the first main body 2121, wherein the cross-section of the second permanent magnet 214 refers to the cross-section obtained by cutting the second permanent magnet 214 along the axial direction O of the second support portion 120 with an arc line having the same arc as the second permanent magnet 214.

[0126] In this embodiment, the cross-sectional dimensions of the second permanent magnet 214 gradually decrease from one end close to the first main body 2121 to one end away from the first main body 2121, so that the dimension of the end close to the air gap Q side is smaller than the dimension of the end away from the air gap Q side, so that the magnetic lines of force L are more gathered toward the air gap Q side, making the air gap magnetic flux waveform closer to a sine wave, thereby improving the air gap magnetic flux.

[0127] Fig.18A magnetic circuit diagram in one of the embodiments is shown, wherein the direction of the arrow is the direction of the magnetic lines of force. It should be noted that the description of the structure and position relationship between the rotor bracket 100 and the magnet structure 200 in the first embodiment is also applicable to the description of the structure and position relationship between the rotor bracket 100 and the magnet structure 200 in the second embodiment; the description of the joint position relationship between the rotor bracket 100, the first soft magnet 211, the first permanent magnet 212, the second permanent magnet 214, and the second soft magnet 213 in the first embodiment is also applicable to the description of the joint position relationship between the rotor bracket 100, the first soft magnet 211, the first permanent magnet 212, the second permanent magnet 214, and the second soft magnet 213 in the second embodiment, which will not be repeated here.

[0128] See also Fig.19 , Fig.19 A schematic diagram of the structure of the axial motor rotor 10 provided in the third embodiment of the present application. In this embodiment, unlike the first embodiment, the magnet unit 210 also includes a third soft magnet 215, the second permanent magnet 214 includes a second main body 2141, a third sub-section 2142 and a fourth sub-section 2143, the third soft magnet 215 is located on the side of the second main body 2141 away from the second soft magnet 213, and the third sub-section 2142 and the fourth sub-section 2143 are arranged on both sides of the second main body 2141 and the third soft magnet 215 along the circumferential direction C of the second support portion 120. In this embodiment, the third sub-section 2142 and the fourth sub-section 2143 in the second permanent magnet 214 protrude toward the air gap Q side relative to the second main body 2141, thereby enhancing the effect of gathering the magnetic lines of force L, thereby making the air gap magnetic flux waveform closer to a sine wave, thereby enhancing the air gap magnetic flux.

[0129] In a possible implementation, at least one of the first soft magnet 211, the second soft magnet 213 and the third soft magnet 215 is a soft magnetic composite magnet. In this embodiment, the first soft magnet 211, the second soft magnet 213 and the third soft magnet 215 are all soft magnetic composite magnets.

[0130] See also Fig. 20 , Fig. 20 It is a magnetic circuit diagram of the magnet unit 210 with two pairs of opposite poles of the two axial motor rotors 10, Fig. 20 FIG. 1 shows a magnetic circuit diagram in one embodiment, wherein the direction of the arrow is the direction of the magnetic force line L. In order to clearly illustrate the magnetic circuit diagram, Fig. 20 The first soft magnetic body 211, the second soft magnetic body 213, the third soft magnetic body 215 and the rotor support 100 are omitted. Fig. 20It is shown that two opposite-pole magnet units 210 form a magnetic circuit. It should be noted that the description of the structure and position relationship between the rotor support 100 and the magnet structure 200 in the first embodiment is also applicable to the description of the structure and position relationship between the rotor support 100 and the magnet structure 200 in the third embodiment; the structural relationship and description of the rotor support 100, the first soft magnet 211, the first permanent magnet 212, and the second soft magnet 213 in the first embodiment are also applicable to the structural relationship and description of the rotor support 100, the first soft magnet 211, the first permanent magnet 212, and the second soft magnet 213 in the third embodiment, which will not be repeated here.

[0131] See also Fig.21 , Fig.21 A schematic diagram of the structure of the axial motor rotor 10 provided in the fourth embodiment of the present application. In this embodiment, unlike the first embodiment, the cross-section of the first permanent magnet 212 and the second permanent magnet 214 is an "I"-shaped structure. Specifically, the magnet unit 210 includes a first soft magnet 211, a first permanent magnet 212, a second soft magnet 213 and a second permanent magnet 214. The first soft magnet 211, the first permanent magnet 212 and the second soft magnet 213 are stacked along the axial direction O of the second support portion 120. A groove 2131 is provided on the surface of the second soft magnet 213 away from the first permanent magnet 212. The second permanent magnet 214 is located in the groove 2131. The projection of the second permanent magnet 214 on the first permanent magnet 212 along the axial direction O of the second support portion 120 is located inside the first permanent magnet 212. In this embodiment, the second permanent magnet 214 is located in the groove 2131 of the second soft magnet 213, and the second permanent magnet 214 is covered by the second soft magnet 213 on both sides along the circumferential direction C, so that the magnetic lines of force flowing out from the two sides of the second permanent magnet 214 along the circumferential direction C can be gathered by the second soft magnet 213, thereby increasing the air gap magnetic density.

[0132] In a possible implementation, the projection of the second permanent magnet 214 on the first permanent magnet 212 along the axial direction O is located inside the first permanent magnet 212 . In one embodiment, the curvature of the second permanent magnet 214 is smaller than that of the first permanent magnet 212 . When the axial motor rotor 10 in this embodiment is installed on the axial motor 1, the second permanent magnet 214 is arranged closer to the stator 12 than the first permanent magnet 212, or the second permanent magnet 214 is arranged closer to the air gap Q than the first permanent magnet 212. The range of the magnetic lines of force L generated by the second permanent magnet 214 is smaller than the range of the magnetic lines of force L generated by the first permanent magnet 212, so that the magnetic lines of force L of the second permanent magnet 214 are more concentrated, and the more concentrated magnetic lines of force L of the second permanent magnet 214 will attract the magnetic lines of force L generated by the first permanent magnet 212, so that the magnetic lines of force L of the first permanent magnet 212 and the second permanent magnet 214 are more concentrated, thereby making more magnetic lines of force L enter the air gap, improving the air gap magnetic density, making the air gap magnetic density waveform closer to a sine wave, increasing the output torque, and improving the performance of the axial motor 1.

[0133] Fig. 22 It is a magnetic circuit diagram of two pairs of opposite poles of the magnet unit 210 of the two axial motor rotors 10. In order to clearly illustrate the magnetic circuit diagram, Fig. 22 The first soft magnetic body 211, the second soft magnetic body 213 and the rotor bracket 100 are omitted, the magnetization directions of the magnet units 210 of a pair of poles in one axial motor rotor 10 are opposite, the magnetization directions of the magnet units 210 of a pair of poles in another axial motor rotor 10 are opposite, and the magnetization directions of the magnet units 210 of the two pairs of poles in the two axial motor rotors 10 are satisfied to form a magnetic force line L circulation loop in the magnet units 210 of the two pairs of poles, and the magnetic force line L enters the winding coil in the middle stator 12, and Fig. 22 As shown in FIG. 2 , two magnet units 210 of opposite poles form a magnetic circuit.

[0134] It should be noted that the description of the structure and positional relationship between the rotor bracket 100 and the magnet structure 200 in the first embodiment is also applicable to the description of the structure and positional relationship between the rotor bracket 100 and the magnet structure 200 in the fourth embodiment; the structural relationship and description of the rotor bracket 100, the first soft magnet 211, and the second soft magnet 213 in the first embodiment are also applicable to the structural relationship and description of the rotor bracket 100, the first soft magnet 211, and the second soft magnet 213 in the fourth embodiment, which will not be repeated here.

[0135] See also Fig.23 , Fig.23A schematic diagram of the structure of the magnet unit 210 in the axial motor rotor 10 provided in the fifth embodiment of the present application. In this embodiment, unlike the first embodiment, the cross-section of the first permanent magnet 212 is an "I"-shaped structure, and the cross-section of the second permanent magnet 214 is a "U"-shaped structure. Specifically, the magnet unit 210 also includes a third soft magnet 215, and the second permanent magnet 214 includes a second main body 2141, a third sub-section 2142 and a fourth sub-section 2143. The third soft magnet 215 is located on a side of the second main body 2141 away from the second soft magnet 213, and the third sub-section 2142 and the fourth sub-section 2143 are arranged on both sides of the second main body 2141 and the third soft magnet 215 along the circumferential direction C of the second support portion 120. In this embodiment, the third section 2142 and the fourth section 2143 of the second permanent magnet 214 protrude toward the air gap Q relative to the second main body 2141, thereby enhancing the effect of gathering the magnetic lines of force L, thereby making the air gap magnetic flux waveform closer to a sine wave, thereby enhancing the air gap magnetic flux.

[0136] Fig.24 It is a magnetic circuit diagram of two pairs of opposite poles of the magnet unit 210 of the two axial motor rotors 10. In order to clearly illustrate the magnetic circuit diagram, Fig.24 The first soft magnetic body 211, the second soft magnetic body 213, the third soft magnetic body 215 and the rotor support 100 are omitted. Fig.24 , a magnetic circuit diagram in one of the embodiments is shown, wherein the direction of the arrow is the direction of the magnetic force line L. It should be noted that the description of the structure and position relationship between the rotor bracket 100 and the magnet structure 200 in the first embodiment is also applicable to the description of the structure and position relationship between the rotor bracket 100 and the magnet structure 200 in the fifth embodiment; the structural relationship and description of the rotor bracket 100, the first soft magnet 211, and the second soft magnet 213 in the first embodiment are also applicable to the structural relationship and description of the rotor bracket 100, the first soft magnet 211, and the second soft magnet 213 in the fifth embodiment, which will not be repeated here.

[0137] See also Fig.25 , Fig.25A schematic diagram of the structure of the magnet unit 210 in the axial motor rotor 10 provided for the sixth embodiment of the present application. In this embodiment, unlike the first embodiment, only the first permanent magnet 212 is included, and the cross-section of the first permanent magnet 212 is a "U"-shaped structure. Specifically, in this embodiment, the first permanent magnet 212 includes a first main body 2121, a first subdivision 2122, and a second subdivision 2123, and the first soft magnet 211, the first main body 2121, and the second soft magnet 213 are stacked along the axial direction O of the second support portion 120, and the first subdivision 2122 and the second subdivision 2123 are arranged on both sides of the first main body 2121 and the second soft magnet 213 along the circumferential direction C of the second support portion 120. In this embodiment, the first soft magnet 211 and the second soft magnet 213 are respectively arranged on both sides of the first permanent magnet 212 along the axial direction O, so that the magnetic lines of force on both sides of the first permanent magnet 212 along the axial direction O are gathered by the soft magnets, increasing the air gap magnetic density. In this embodiment, the arrangement of the first sub-portion 2122 and the second sub-portion 2123 is conducive to gathering the magnetic lines of force L. When the first sub-portion 2122 and the second sub-portion 2123 protrude toward one side of the stator 12, the magnetic lines of force L converge into the winding coil on the stator 12, so that the air gap magnetic flux waveform is close to a sine wave, which can increase the output torque and reduce the torque fluctuation. In this embodiment, the cross-section of the first permanent magnet 212 is "U" shaped.

[0138] Fig.26 It is a magnetic circuit diagram of two pairs of opposite poles of the magnet unit 210 of the two axial motor rotors 10. In order to clearly illustrate the magnetic circuit diagram, Fig.26 The first soft magnetic body 211, the second soft magnetic body 213 and the rotor support 100 are omitted. Fig.26 , a magnetic circuit diagram in one of the embodiments is shown, wherein the direction of the arrow is the direction of the magnetic force line L. It should be noted that the description of the structure and position relationship between the rotor bracket 100 and the magnet structure 200 in the first embodiment is also applicable to the description of the structure and position relationship between the rotor bracket 100 and the magnet structure 200 in the sixth embodiment; the structural relationship and description of the rotor bracket 100, the first soft magnet 211, and the second soft magnet 213 in the first embodiment are also applicable to the structural relationship and description of the rotor bracket 100, the first soft magnet 211, and the second soft magnet 213 in the sixth embodiment, which will not be repeated here.

[0139] See also Fig. 27 , Fig. 27A schematic diagram of the structure of the magnet unit 210 in the axial motor rotor 10 provided in the seventh embodiment of the present application. In this embodiment, unlike the first embodiment, the cross-section of the first permanent magnet 212 and the second permanent magnet 214 is "U"-shaped, and the angle between the middle branch of the first permanent magnet 212 and the main body is greater than 90°, and the angle between the middle branch of the second permanent magnet 214 and the main body is greater than 90°. Specifically, in this embodiment, the magnet unit 210 also includes a third soft magnet 215, the second permanent magnet 214 includes a second main body 2141, a third branch 2142 and a fourth branch 2143, the third soft magnet 215 is located on the side of the second main body 2141 away from the second soft magnet 213, and the third branch 2142 and the fourth branch 2143 are arranged on both sides of the second main body 2141 and the third soft magnet 215 along the circumferential direction C of the second support portion 120. In this embodiment, the third section 2142 and the fourth section 2143 of the second permanent magnet 214 protrude toward the air gap relative to the second main body 2141, thereby enhancing the effect of gathering magnetic lines of force, thereby making the air gap magnetic flux waveform closer to a sine wave, thereby enhancing the air gap magnetic flux.

[0140] In this embodiment, in the second permanent magnet 214, the angle between the third subsection 2142 and the fourth subsection 2143 and the second main body 2141 is greater than 90°; in the first permanent magnet 212, the angle between the first subsection 2122 and the second subsection 2123 and the first main body 2121 is greater than 90°. In some embodiments, the angle value between the third subsection 2142 and the fourth subsection 2143 and the second main body 2141 can be set as needed, and the angle value between the first subsection 2122 and the second subsection 2123 and the first main body 2121 can be set as needed, so that the magnet structure 200 meets the magnetic density requirements, output torque requirements, etc. of the axial motor 1.

[0141] In this embodiment, the shapes and sizes of the first soft magnet 211 , the second soft magnet 213 and the third soft magnet 215 can be set according to the shapes and sizes of the first permanent magnet 212 and the second permanent magnet 214 , so that the magnet unit 210 can be installed in the rotor holder 100 .

[0142] Fig.28 It is a magnetic circuit diagram of two pairs of opposite poles of the magnet unit 210 of the two axial motor rotors 10. In order to clearly illustrate the magnetic circuit diagram, Fig.28 The first soft magnetic body 211, the second soft magnetic body 213, the third soft magnetic body 215 and the rotor support 100 are omitted. Fig.28, a magnetic circuit diagram in one embodiment is shown, wherein the direction of the arrow is the direction of the magnetic force line L. It should be noted that the description of the structure and position relationship between the rotor support 100 and the magnet structure 200 in the first embodiment is also applicable to the description of the structure and position relationship between the rotor support 100 and the magnet structure 200 in the seventh embodiment.

[0143] The axial motor rotor, axial motor, powertrain and vehicle provided in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the ideas of the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An axial motor rotor, characterized in that: include; A rotor bracket, comprising a first support portion, a second support portion and a plurality of positioning columns, wherein the first support portion and the second support portion are coaxial, and the first support portion is sleeved on a side of the second support portion away from the axis of the second support portion, and both ends of each of the plurality of positioning columns are fixedly connected to the first support portion and the second support portion respectively; A magnet structure includes a plurality of magnet units, wherein the plurality of magnet units are arranged in sequence along the circumference of the second support portion, and each of the plurality of magnet units is located between the first support portion and the second support portion, and the two radial ends of the magnet unit along the second support portion are respectively fixed to the first support portion and the second support portion, and the magnet unit includes a first soft magnet and a first permanent magnet, and at least part of the first soft magnet and at least part of the first permanent magnet are stacked along the axial direction of the second support portion, and each of the positioning columns is arranged between the first permanent magnets in two adjacent magnet units along the circumference of the second support portion, and each of the positioning columns is used to separate the first permanent magnets in two adjacent magnet units, and each of the positioning columns is stacked on the first soft magnets in two adjacent magnet units along the axial direction of the second support portion.

2. The axial motor rotor according to claim 1, characterized in that: The rotor bracket also includes limiting ribs, which are located on both sides of the positioning column along the circumference of the second support part, and the limiting ribs are provided on the opposite surfaces of two adjacent positioning columns. A limiting groove is provided between the first permanent magnet and the first soft magnet of each magnet unit, and the notch of the limiting groove faces the positioning column along the circumference of the second support part, and the limiting ribs are used to be inserted into the limiting groove.

3. The axial motor rotor according to claim 2, characterized in that: The first permanent magnet includes a first main body, a first branch and a second branch. The first soft magnetic body and the first main body are stacked along the axial direction of the second support part. The first branch and the second branch are arranged on both sides of the first main body along the circumferential direction of the second support part. There is a gap between the first branch and the first soft magnetic body along the axial direction of the second support part. The first branch, the first soft magnetic body and the first main body are arranged to form the limiting groove.

4. The axial motor rotor according to claim 1, characterized in that: A flow hole extending radially along the second supporting portion is provided in the positioning column.

5. The axial motor rotor according to any one of claims 1 to 4, characterized in that: The circumferential dimension of the magnet unit gradually increases from an end close to the second supporting portion to an end away from the second supporting portion; The first permanent magnet is continuous along the radial direction of the second supporting portion; A projection of the first permanent magnet on the first soft magnetic body along the axial direction of the second supporting portion is located inside the first soft magnetic body.

6. The axial motor rotor according to claim 5, characterized in that: The first permanent magnet includes a first main body, a first sub-part, and a second sub-part, and the magnet unit also includes a second soft magnet, the first soft magnet, the first main body, and the second soft magnet are stacked along the axial direction of the second support portion, and the first sub-part and the second sub-part are arranged on both sides of the first main body and the second soft magnet along the circumferential direction of the second support portion; The magnet unit further includes a second permanent magnet, a surface of the second soft magnetic body facing away from the first main body is provided with a groove, and the second permanent magnet is located in the groove; A projection of the second permanent magnet on the first main body along the axial direction of the second supporting portion is located inside the first main body.

7. The axial motor rotor according to claim 6, characterized in that: The magnet unit further includes a third soft magnet, the second permanent magnet includes a second main body, a third sub-part, and a fourth sub-part, the third soft magnet is located on a side of the second main body away from the second soft magnet, and the third sub-part and the fourth sub-part are arranged on both sides of the second main body and the third soft magnet along the first direction; At least one of the first soft magnetic body, the second soft magnetic body and the third soft magnetic body is a soft magnetic composite material magnet.

8. The axial motor rotor according to any one of claims 1 to 4, characterized in that: The magnet unit also includes a second soft magnet and a second permanent magnet. The first soft magnet, the first permanent magnet and the second soft magnet are stacked along the axial direction of the second support part. A groove is provided on the surface of the second soft magnet facing away from the first permanent magnet. The second permanent magnet is located in the groove. The projection of the second permanent magnet on the first permanent magnet along the axial direction of the second support part is located in the first permanent magnet.

9. The axial motor rotor according to any one of claims 1 to 4, characterized in that: Two adjacent positioning posts and a portion of the first supporting portion and a portion of the second supporting portion between the two adjacent positioning posts form a receiving space, and the magnet unit is located in the receiving space.

10. The axial motor rotor according to any one of claims 1 to 4, characterized in that: The rotor bracket is a non-magnetic bracket.

11. An axial motor, characterized in that: The axial motor includes a motor shaft, a stator and an axial motor rotor as described in any one of claims 1 to 10, wherein the stator is mounted on the motor shaft and is rotatably connected to the motor shaft, the axial motor rotor is mounted on the motor shaft and is fixedly connected to the motor shaft, and the first soft magnet is located on a side of the first permanent magnet facing away from the stator.

12. The axial motor according to claim 11, characterized in that The axial motor comprises two axial motor rotors, both of which are mounted on the motor shaft and fixedly connected to the motor shaft, and the two axial motor rotors are located on both sides of the stator along the axial direction of the motor shaft.

13. A powertrain, characterized in that: It comprises a gearbox and an axial motor as claimed in claim 11, wherein the axial motor is drivingly connected to a power input shaft in the gearbox for outputting power to the power input shaft.

14. A vehicle, characterized in that: The vehicle comprises a vehicle body and the axial motor according to claim 11 or 12, wherein the axial motor is mounted on the vehicle body; or The vehicle comprises a vehicle body and the powertrain as claimed in claim 13, wherein the powertrain is mounted on the vehicle body.

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