High-speed axial motor and rotor thereof

Abstract

The utility model discloses a high-speed axial motor rotor, which comprises magnetic conduction back iron, a rotating shaft and magnetic steel, the magnetic steel is fixedly connected to the end face, close to a stator, of the magnetic conduction back iron, and the magnetic conduction back iron is connected to the rotating shaft through a pressing plate; the side face of the magnetic conduction back iron is provided with a limiting flange, the height of the limiting flange is larger than that of the end face, connected with the magnetic steel, of the magnetic conduction back iron, the inner side face of the limiting flange makes contact with the side face, away from the rotating shaft, of the magnetic steel, and the height of the limiting flange is smaller than that of the magnetic steel. The high-speed axial motor rotor provided by the utility model has the advantages of high rotor strength, low eddy-current loss and small temperature rise, and is not easy to deform during operation. The utility model also discloses a high-speed axial motor.

Description

Technical Field

[0001] The utility model relates to the technical field of axial motors, and particularly relates to a high-speed axial motor and its rotor. Background Art

[0002] The axial flux motor is simply called the axial motor, which has a compact structure, a large power density, and high efficiency. Increasing the rotational speed can improve the power density of the motor. Therefore, the high-speed development of the motor has become a trend. However, the high-speed operation of the motor requires a higher structural strength of the rotor. At the same time, high speed will cause the frequency of the motor to increase and the rotor loss to increase. For a double-stator single-rotor structure motor, the internal space of the rotor is narrow, and it is difficult to dissipate heat, which easily leads to the risk of demagnetization of the magnetic steel due to too high temperature.

[0003] For a conventional axial motor with a double-stator single-rotor structure, the rotor structure includes a magnetic steel 02, a cage 01, a sheath 03, and a rotating shaft 04, as Figure 1 shown. When the axial motor runs at a high speed, the centrifugal force is large, and the large centrifugal force easily deforms the cage. Therefore, a cage made of a metal material is generally used for a high-speed axial motor. The cage 01 of the rotor of the axial motor is in the same plane as the magnetic steel 02, so that the cage 01 is close to the stator side. The closer to the stator side, the stronger the action of the stator-side magnetic field on the rotor. Since the cage 01 is made of a metal material, a large eddy current loss will be generated in the cage 01, resulting in an increase in the rotor temperature rise. Summary of the Utility Model

[0004] In view of this, the utility model provides a rotor of a high-speed axial motor, which has high strength, is not easily deformed during operation, has low eddy current loss, and has a small rotor temperature rise.

[0005] The utility model also provides a high-speed axial motor.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] A rotor of a high-speed axial motor includes a magnetic conductive back iron, a rotating shaft, and a magnetic steel. The magnetic steel is fixedly connected to the end face of the magnetic conductive back iron close to the stator, and the magnetic conductive back iron is connected to the rotating shaft through a pressing plate; a limiting flange is arranged on the side surface of the magnetic conductive back iron. The height of the limiting flange is higher than the height of the end face of the magnetic conductive back iron connecting the magnetic steel. The inner side surface of the limiting flange is in contact with the side surface of the magnetic steel away from the rotating shaft, and the height of the limiting flange is lower than the height of the magnetic steel.

[0008] Optionally, a groove is arranged on the limiting flange. The groove is arranged at a position corresponding to the gap between two adjacent magnetic steels on the limiting flange, and the width of the groove is smaller than the width of the gap between two adjacent magnetic steels.

[0009] Optionally, the permanent magnet includes a plurality of first permanent magnets and a plurality of second permanent magnets. A plurality of the first permanent magnets are fixedly connected to one end face of the magnetic conduction back iron, and a plurality of the second permanent magnets are fixedly connected to the other end face of the magnetic conduction back iron. The first permanent magnets and the second permanent magnets are arranged in one-to-one correspondence along the axial direction of the rotating shaft.

[0010] Optionally, a first through hole for connecting with the rotating shaft is provided on the magnetic conduction back iron. A plurality of second through holes are uniformly arranged around the first through hole. A connecting member for connecting the pressing plate and the rotating shaft is disposed in the second through holes.

[0011] Optionally, a connecting flange is provided on the rotating shaft. A first connecting hole is provided on the connecting flange. One end of the magnetic conduction back iron is in contact with the connecting flange, and the other end is in contact with the pressing plate;

[0012] A second connecting hole is provided on the pressing plate. The second connecting hole is correspondingly arranged with the first connecting hole. The connecting member is connected in the first connecting hole and the second connecting hole.

[0013] Optionally, the second connecting hole is a clearance hole, and the first connecting hole is a clearance hole or a threaded hole.

[0014] Optionally, a heat conducting member for transferring the heat of the permanent magnet to the rotating shaft is provided in the magnetic conduction back iron. The end portion of the heat conducting member close to the rotating shaft extends out of the magnetic conduction back iron and is in contact with the rotating shaft. A cooling chamber for conveying a cooling fluid is provided in the rotating shaft. The cooling chamber is a through cavity arranged along the axial direction of the rotating shaft.

[0015] Optionally, the magnetic conduction back iron includes a first sub-back iron and a second sub-back iron stacked together;

[0016] The first permanent magnets are connected to the end face of the first sub-back iron away from the second sub-back iron. A first placement groove is provided on the end face of the first sub-back iron close to the second sub-back iron;

[0017] The second permanent magnets are connected to the end face of the second sub-back iron away from the first sub-back iron. A second placement groove is provided on the end face of the second sub-back iron close to the first sub-back iron;

[0018] The first placement groove and the second placement groove are correspondingly arranged. The first placement groove and the second placement groove are spliced into a heat conducting groove. The heat conducting member is disposed in the heat conducting groove.

[0019] Optionally, one end of the heat conducting groove away from the rotating shaft is a sealed structure, and the end close to the rotating shaft is an open structure. One end portion of the heat conducting member is in contact with the outer surface of the rotating shaft through the open structure of the heat conducting groove.

[0020] As can be seen from the above technical solution, for the high-speed axial motor rotor provided by the present utility model, the magnetic conductive back iron of the rotor disc is a metal structure, which effectively improves the strength of the rotor. By fixedly connecting the magnetic steel to the end face of the magnetic conductive back iron, that is, placing the magnetic steel on the face of the magnetic conductive back iron close to the stator, the magnetic conductive back iron is away from the stator air gap face, weakening the influence of the stator magnetic field on the rotor back iron and reducing the eddy current loss generated by the stator side harmonics in the back iron. To protect the magnetic steel and prevent excessive centrifugal force from affecting the structural reliability of the rotor, the outer diameter of the magnetic conductive back iron is larger than the outer diameter of the magnetic steel, and a limiting flange is provided on the magnetic conductive back iron to limit the outer diameter of the magnetic steel, enabling the rotor to withstand greater centrifugal force. The protruding height of the limiting flange is lower than the surface of the magnetic steel to reduce the eddy current loss at this position, weakening the eddy current loss of the magnetic conductive back iron, avoiding the increase in rotor temperature rise, and preventing the magnetic steel from demagnetizing due to excessive temperature.

[0021] The present utility model also provides a high-speed axial motor, including a rotor and a stator. The rotor is the high-speed axial motor rotor described above, and thus has the advantages of the above rotor, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of the rotor of an axial motor in the prior art;

[0024] Figure 2 It is a schematic installation structure diagram of the high-speed axial motor rotor provided by an embodiment of the present utility model;

[0025] Figure 3 It is an exploded structural diagram of the high-speed axial motor rotor provided by an embodiment of the present utility model;

[0026] Figure 4 It is a sectional structural diagram of the high-speed axial motor rotor provided by an embodiment of the present utility model;

[0027] Figure 5 It is a magnetic circuit structural diagram of the high-speed axial motor rotor provided by an embodiment of the present utility model;

[0028] Figure 6 It is a structural diagram of the magnetic conductive back iron from an angle provided by an embodiment of the present utility model;

[0029] Figure 7Schematic diagram of the magnetic back iron provided by the embodiment of the present utility model from another angle;

[0030] Figure 8 For Figure 7 Schematic diagram of the sectional structure at the A-A position in

[0031] Figure 9 Schematic diagram of the structure of the rotating shaft provided by the embodiment of the present utility model from one angle;

[0032] Figure 10 Schematic diagram of the structure of the rotating shaft provided by the embodiment of the present utility model from another angle;

[0033] Figure 11 Schematic diagram of the sectional structure of the rotating shaft provided by the embodiment of the present utility model;

[0034] Figure 12 Explosion structure diagram of the magnetic back iron of the high-speed axial motor rotor provided by another embodiment of the present utility model;

[0035] Figure 13 For Figure 12 Schematic diagram of the structure of the first sub-back iron in the embodiment.

[0036] Wherein:

[0037] 01. Cage, 02. Magnet, 03. Sheath, 04. Rotating shaft,

[0038] 1. Magnetic back iron,

[0039] 100. First sub-back iron, 1001. First placement groove, 1002. Third connection hole, 1003. Fifth connection hole,

[0040] 200. Second sub-back iron, 2001. Second placement groove, 2002. Fourth connection hole, 2003. Sixth connection hole,

[0041] 101. Groove, 102. First through hole, 103. Second through hole, 104. Limit flange,

[0042] 2. Connecting piece,

[0043] 3. Pressure plate,

[0044] 301. Second connection hole,

[0045] 4. Rotating shaft,

[0046] 401. Cooling chamber, 402. Connecting flange, 403. First connection hole,

[0047] 5. First magnet,

[0048] 6. Second magnet,

[0049] 7. Stator

[0050] 8. Heat conducting member Detailed implementation manners

[0051] The utility model discloses a high-speed axial motor rotor, which has high rotor strength, is not easily deformed during operation, has low eddy current loss, and small rotor temperature rise.

[0052] The utility model also discloses a high-speed axial motor.

[0053] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0054] Referring to Figures 2 to 13 , the high-speed axial motor rotor of the present utility model includes a magnetic conductive back iron 1, a rotating shaft 4 and a magnetic steel. The magnetic steel is fixedly connected to the end face of the magnetic conductive back iron 1 close to the stator 7, and the magnetic conductive back iron 1 is connected to the rotating shaft 4 through a pressing plate 3. A limiting flange 104 is provided on the side surface of the magnetic conductive back iron 1. The height of the limiting flange 104 is higher than the height of the end face of the magnetic conductive back iron 1 connecting the magnetic steel. The inner side surface of the limiting flange 104 is in contact with the side surface of the magnetic steel away from the rotating shaft 4, so as to facilitate the limitation of the magnetic steel, enabling the rotor to withstand greater centrifugal force and thus being applicable to higher rotational speeds. The height of the limiting flange 104 is lower than the height of the magnetic steel.

[0055] Among them, the high-speed axial motor rotor is the rotor of an axial motor with double stators and a single rotor. The magnetic conductive back iron 1 is used to support the magnetic steel, which is equivalent to the cage in a conventional motor. A plurality of magnetic steels are provided, and the plurality of magnetic steels are radially and evenly spaced around the axis of the magnetic conductive back iron 1 on the end face of the magnetic conductive back iron 1.

[0056] The high-speed axial motor rotor of the present utility model has a rotor disc magnetic conductive back iron 1 made of a metal structure, which effectively improves the strength of the rotor. By fixedly connecting the magnetic steel to the end face of the magnetic conductive back iron 1, that is, placing the magnetic steel on the face of the magnetic conductive back iron 1 close to the stator 7, the magnetic conductive back iron 1 is away from the stator air gap face, weakening the influence of the stator magnetic field on the rotor back iron 1 and reducing the eddy current loss generated by the stator-side harmonics in the back iron. To protect the magnetic steel and prevent excessive centrifugal force from affecting the structural reliability of the rotor, the outer diameter of the magnetic conductive back iron 1 is larger than the outer diameter of the magnetic steel. The magnetic conductive back iron 1 is provided with a limiting flange 104 to limit the outer diameter of the magnetic steel, enabling the rotor to withstand greater centrifugal force. The protruding height of the limiting flange 104 is lower than the surface of the magnetic steel to reduce the eddy current loss at this position, weaken the eddy current loss of the magnetic conductive back iron 1, avoid the increase in rotor temperature rise, and avoid the demagnetization of the magnetic steel due to excessive temperature.

[0057] To reduce the magnetic leakage between the magnetic steels, the limiting flange 104 is provided with a groove 101. The groove 101 is arranged at the position corresponding to the gap between two adjacent magnetic steels on the limiting flange 104, and the width of the groove 101 is smaller than the width of the gap between two adjacent magnetic steels, as Figures 6 to 8 shown. In one embodiment, the groove 101 is cut on the limiting flange 104, and the groove depth of the groove 101 is the same as the height of the limiting flange 104.

[0058] In one embodiment, as Figure 3 shown, the magnetic steel includes a plurality of first magnetic steels 5 and a plurality of second magnetic steels 6. A plurality of first magnetic steels 5 are fixedly connected to one end face of the magnetic conductive back iron 1, and a plurality of second magnetic steels 6 are fixedly connected to the other end face of the magnetic conductive back iron 1. Among them, the first magnetic steels 5 and the second magnetic steels 6 are arranged in one-to-one correspondence along the axial direction of the rotating shaft 4, that is, the magnetic steels on the two end faces of the magnetic conductive back iron 1 are arranged in corresponding positions.

[0059] To facilitate the installation with the rotating shaft 4, the magnetic conductive back iron 1 is provided with a first through hole 102 for connecting with the rotating shaft 4, and the rotating shaft 4 passes through the first through hole 102. To facilitate the positioning of the magnetic conductive back iron 1, a plurality of second through holes 103 are evenly arranged around the first through hole 102, and a connecting member 2 for connecting the pressing plate 3 and the rotating shaft 4 is inserted into the second through holes 103. The connecting member 2 connects the pressing plate 3, the magnetic conductive back iron 1, and the rotating shaft 4 together.

[0060] To facilitate the positioning of the magnetic conductive back iron 1, the rotating shaft 4 is provided with a connecting flange 402, as Figures 9 to 11, a first connection hole 403 is provided on the connecting flange 402. One end of the magnetic conductive back iron 1 is in contact with the connecting flange 402, and the other end is in contact with the pressing plate 3. The connecting flange 402 limits one end of the magnetic conductive back iron 1, and the pressing plate 3 limits the other end of the magnetic conductive back iron 1, realizing reliable positioning of the magnetic conductive back iron 1. It can be understood that the diameter of the pressing plate 3 is smaller than the spacing distance between the two relatively arranged magnetic steels at the same end, so as to facilitate the pressing plate 3 to be pressed on the magnetic conductive back iron 1. For the convenience of the connecting member 2 to pass through, a second connection hole 301 is provided on the pressing plate 3. The second connection hole 301, the second through hole 103 and the first connection hole 403 are correspondingly arranged, and the number of the three is the same and the diameters correspond. The connecting member 2 is sequentially passed through the second connection hole 301, the second through hole 103 and the first connection hole 403.

[0061] Further, the second connection hole 301 is a smooth hole, and the first connection hole 403 is a smooth hole or a threaded hole. In one embodiment, the first connection hole 403 is a smooth hole, the connecting member 2 is a connecting bolt, and the tail end of the connecting bolt passes through the second connection hole 301, the second through hole 103 and the first connection hole 403 and is limited by a connecting nut. In another embodiment, the first connection hole 403 is a threaded hole, the connecting member 2 is a connecting bolt, and the tail end of the connecting bolt passes through the second connection hole 301 and the second through hole 103 and is threadedly connected to the first connection hole 403.

[0062] In order to improve the heat dissipation capacity of the rotor, in one embodiment, a heat conducting member 8 for transferring the heat of the magnetic steel to the rotating shaft 4 is arranged in the magnetic conductive back iron 1. The heat conducting member 8 is a component with good heat conductivity, preferably a heat pipe or a ceramic sheet. The end of the heat conducting member 8 close to the rotating shaft 4 extends out of the magnetic conductive back iron 1 and is in contact with the outer surface of the rotating shaft 4, and the end far from the rotating shaft 4 is arranged inside the magnetic conductive back iron 1. The heat conducting member 8 is arranged close to the magnetic steel, so as to facilitate the conduction of the heat of the magnetic steel to the rotating shaft 4 for dissipation. At the same time, the heat on the magnetic conductive back iron 1 will also be conducted to the rotating shaft 4 through the heat conducting member 8. In order to quickly dissipate the heat on the rotating shaft 4, a cooling chamber 401 for conveying a cooling fluid is arranged in the rotating shaft 4. The cooling chamber 401 is a through cavity arranged along the axial direction of the rotating shaft 4. One end of the cooling chamber 401 is the inlet of the cooling fluid, and the other end is the outlet of the cooling fluid. The cooling chamber 401 is communicated with an external cooling pipeline, and a fluid power device is arranged on the cooling pipeline. The cooling fluid is cold water or flowing air, and the fluid power device is a water pump or an air pump.

[0063] In order to facilitate the installation of the heat conducting member 8 in the magnetic conductive back iron 1, the magnetic conductive back iron 1 includes a stacked first sub-back iron 100 and a second sub-back iron 200. The first sub-back iron 100 and the second sub-back iron 200 are spliced into the magnetic conductive back iron 1, as Figure 12As shown. Specifically, a first magnetic steel 5 is connected to the end face of the first split back iron 100 away from the second split back iron 200. A first placement groove 1001 is provided on the end face of the first split back iron 100 close to the second split back iron 200. Refer to Figure 13 As shown, the first placement groove 1001 is arranged along the radial direction of the first split back iron 100. Correspondingly, a second magnetic steel 6 is connected to the end face of the second split back iron 200 away from the first split back iron 100. A second placement groove 2001 is provided on the end face of the second split back iron 200 close to the first split back iron 100. As Figure 12 shown, the second placement groove 2001 is arranged along the radial direction of the second split back iron 200. In order to be mounted on the rotating shaft 4, a third connection hole 1002 is provided on the first split back iron 100, and a fourth connection hole 2002 is provided on the second split back iron 200. After the third connection hole 1002 and the fourth connection hole 2002 are spliced, they correspond to the first through hole 102 in the above embodiment. The rotating shaft 4 passes through the third connection hole 1002 and the fourth connection hole 2002. The first placement groove 1001 and the second placement groove 2001 are arranged corresponding to each other, and the groove openings of the first placement groove 1001 and the second placement groove 2001 are arranged corresponding to each other, and are spliced into an integral heat conduction groove. The heat conduction member 8 is arranged in the heat conduction groove. The first placement groove 1001 is arranged on the corresponding surface of the gap position between two adjacent first magnetic steels 5 of the first split back iron 100, and the second placement groove 2001 is arranged on the corresponding surface of the gap position between two adjacent second magnetic steels 6 of the second split back iron 200.

[0064] Further, one end of the heat conduction groove away from the rotating shaft 4 is a sealed structure, and one end close to the rotating shaft 4 is an open structure. The end of the heat conduction member 8 close to the rotating shaft 4 is in contact with the outer surface of the rotating shaft 4 through the open structure of the heat conduction groove, so as to transfer the heat on the magnetic conduction back iron 1 and the magnetic steel to the rotating shaft 4 as soon as possible, and the heat is dissipated by the rotating shaft 4.

[0065] In order to facilitate the connection between the first split back iron 100 and the second split back iron 200, a fifth connection hole 1003 is provided on the first split back iron 100, and a sixth connection hole 2003 is provided on the second split back iron 200. The fifth connection hole 1003 and the sixth connection hole 2003 are arranged corresponding to each other. The connecting member 2 passes through the fifth connection hole 1003 and the sixth connection hole 2003, and connects the first split back iron 100 and the second split back iron 200 to the connection flange 402 of the rotating shaft 4. A limiting flange 104 is provided on the surface of the first split back iron 100 and the second split back iron 200 for connecting the magnetic steel. A groove 101 is provided on the limiting flange 104. The specific structure refers to the previous embodiment and will not be elaborated here.

[0066] For the high-speed axial motor rotor in this embodiment, a heat conducting member 8 is arranged inside the back iron at the middle position between two adjacent magnetic steels. The heat generated by the magnetic steels and the back iron is transferred to the rotating shaft 4 of the motor through the heat conducting member 8 for cooling and heat dissipation. The inside of the cooling chamber 401 of the rotating shaft 4 adopts air cooling or liquid cooling to improve the heat dissipation effect. The heat conducting member 8 is arranged inside the magnetic conducting back iron 1 at the middle position between the adjacent magnetic steels, and its shape is not limited. The heat conducting member 8 cannot be placed at the position axially opposite to the magnetic steel to avoid affecting the main magnetic circuit and reducing the output performance of the motor. To facilitate the placement of the heat conducting member 8, the magnetic conducting back iron 1 is made into a split structure including a first split back iron 100 and a second split back iron 200. A heat conducting groove for accommodating heat conducting material is arranged inside the magnetic conducting back iron 1. The heat conducting member 8 is placed in the heat conducting groove of the back iron. The sides of the outer circles of the first split back iron 100 and the second split back iron 200 can be fixed by welding, and the inner circles are further fixed by a pressing plate 3 and a connecting member 2.

[0067] For the high-speed axial motor rotor of the present utility model, the magnetic conducting back iron 1 is used to install the magnetic steel, which can effectively improve the strength of the rotor and effectively solve the problem of rotor disk deformation caused by high-speed centrifugal force. The magnetic steels of the rotor are arranged on both sides of the magnetic conducting back iron 1 in a magnetic circuit structure, so that the magnetic conducting back iron 1 is far from the stator side, weakening the eddy current loss in the magnetic conducting back iron 1. Grooves 101 are arranged at the radial positions of the corresponding back iron between the adjacent magnetic steels on the same side, effectively reducing the magnetic leakage between the magnetic steels. By arranging the heat conducting member 8 made of high heat conducting material inside the magnetic conducting back iron 1, it is beneficial to transfer the temperature of the rotor disk to the rotating shaft 4 for heat dissipation, effectively reducing the rotor temperature rise and preventing the magnetic steel from demagnetizing. At the same time, the heat conducting member 8 is arranged at the internal position of the back iron, which can effectively reduce the magnetic leakage between the magnetic steels.

[0068] The present utility model also provides a high-speed axial motor, including a rotor and a stator, and the rotor is the high-speed axial motor rotor described above.

[0069] In the description of this solution, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to this solution.

[0070] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this solution, "a plurality" means two or more, unless otherwise specifically defined.

[0071] In the present specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference may be made to each other.

[0072] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-speed axial motor rotor, characterized in that, It includes a magnetic conductive back iron, a rotating shaft and a permanent magnet. The permanent magnet is fixedly connected to the end face of the magnetic conductive back iron close to the stator, and the magnetic conductive back iron is connected to the rotating shaft through a pressing plate. A limiting flange is arranged on the side surface of the magnetic conductive back iron. The height of the limiting flange is higher than the height of the end face of the magnetic conductive back iron connecting the permanent magnet. The inner side surface of the limiting flange is in contact with the side surface of the permanent magnet far from the rotating shaft, and the height of the limiting flange is lower than the height of the permanent magnet.

2. The high-speed axial motor rotor according to claim 1, wherein A groove is arranged on the limiting flange. The groove is arranged at the position corresponding to the gap between two adjacent permanent magnets on the limiting flange, and the width of the groove is smaller than the width of the gap between two adjacent permanent magnets.

3. The high-speed axial motor rotor according to claim 1 or 2, characterized in that The permanent magnet includes a plurality of first permanent magnets and a plurality of second permanent magnets. A plurality of the first permanent magnets are fixedly connected to one end face of the magnetic conductive back iron, and a plurality of the second permanent magnets are fixedly connected to the other end face of the magnetic conductive back iron. The first permanent magnets and the second permanent magnets are arranged in one-to-one correspondence along the axial direction of the rotating shaft.

4. The high-speed axial motor rotor according to claim 1 or 2, characterized in that, A first through hole for connecting with the rotating shaft is arranged on the magnetic conductive back iron. A plurality of second through holes are uniformly arranged around the first through hole. A connecting piece for connecting the pressing plate and the rotating shaft is arranged in the second through holes.

5. The high-speed axial motor rotor according to claim 4, characterized in that A connecting flange is arranged on the rotating shaft. A first connecting hole is arranged on the connecting flange. One end of the magnetic conductive back iron is in contact with the connecting flange, and the other end is in contact with the pressing plate. A second connecting hole is arranged on the pressing plate. The second connecting hole is arranged corresponding to the first connecting hole, and the connecting piece is connected in the first connecting hole and the second connecting hole.

6. The high-speed axial motor rotor according to claim 5, characterized in that, The second connecting hole is a clearance hole, and the first connecting hole is a clearance hole or a threaded hole.

7. The high-speed axial motor rotor according to claim 1, characterized in that, A heat conducting piece for transferring the heat of the permanent magnet to the rotating shaft is arranged in the magnetic conductive back iron. The end part of the heat conducting piece close to the rotating shaft extends out of the magnetic conductive back iron and is in contact with the rotating shaft. A cooling cavity for conveying a cooling fluid is arranged in the rotating shaft, and the cooling cavity is a through cavity arranged along the axial direction of the rotating shaft.

8. The high-speed axial motor rotor according to claim 7, characterized in that, The magnetic conductive back iron includes a first sub-back iron and a second sub-back iron which are stacked. The first permanent magnet is connected to the end face of the first sub-back iron far from the second sub-back iron, and a first placement groove is arranged on the end face of the first sub-back iron close to the second sub-back iron. The second permanent magnet is connected to the end face of the second sub-back iron far from the first sub-back iron, and a second placement groove is arranged on the end face of the second sub-back iron close to the first sub-back iron. The first placement groove and the second placement groove are arranged corresponding to each other, and the first placement groove and the second placement groove are spliced into a heat conducting groove, and the heat conducting piece is arranged in the heat conducting groove.

9. The high-speed axial motor rotor according to claim 8, wherein One end of the heat conducting groove far from the rotating shaft is a sealed structure, and one end close to the rotating shaft is an open structure. One end part of the heat conducting piece is in contact with the outer surface of the rotating shaft through the open structure of the heat conducting groove.

10. A high-speed axial motor, comprising a rotor and a stator, characterized in that, The rotor is the high-speed axial motor rotor according to any one of claims 1-9.

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