Surface mount motor rotor, motor

Abstract

The present invention provides a surface-mounted motor rotor and a motor, wherein the surface-mounted motor rotor includes a rotating shaft having a central receiving hole extending along its axial direction, a solid cylindrical magnet being installed in the central receiving hole, an annular magnet being mounted on the rotating shaft, and the annular magnet being mounted on the radially outer peripheral side of the solid cylindrical magnet. According to the present invention, a solid cylindrical magnet disposed in the central hole of the rotating shaft in the prior art is divided into a solid cylindrical magnet disposed in the center and an annular magnet mounted around the outer portion thereof, that is, the large block of magnet is divided into a double-layer structure, effectively reducing eddy current loss inside the magnet, which is beneficial to reducing the heat generated by the rotor magnet, thereby reducing the temperature rise of the magnet, and can prevent the occurrence of irreversible demagnetization of the magnet to a certain extent. In addition, this double-layer magnet arrangement can improve the tensile strength of the rotor magnet while ensuring the magnetic properties of the motor, thereby significantly improving the upper limit of the speed.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor manufacturing, and in particular relates to a surface-mounted motor rotor and a motor. Background Art

[0002] The cooling problem is the cooling problem of the motor rotor, which has always been the focus and difficulty in the design and development of high-speed motors. In a specific surface-mounted rotor, a solid cylindrical magnet is installed in the center of its shaft in order to have higher electromagnetic performance. However, during high-speed rotation, a motor with this structure will cause a large amount of eddy current loss inside the rotor, which will cause its own temperature to rise too high. Once the cooling is not good, it is very likely that irreversible demagnetization of the magnet will occur, seriously affecting the performance of the motor. Therefore, how to ensure that the magnet is well cooled is a current problem. As far as the existing technology is concerned, the rotor is usually cooled by means of the air gap between the stator and the rotor, by rotating the impeller to supply air or by opening holes in the stator and the housing to achieve radial ventilation cooling. The air duct flows through the inside of the rotor to take away some heat. Obviously, the cooling is not sufficient, the internal magnet cannot be effectively cooled, and the problem of the temperature rise of the motor rotor cannot be solved. Summary of the Invention

[0003] Therefore, the present invention provides a surface-mounted motor rotor and motor, which can overcome the shortcomings of the related art in which a large amount of eddy current loss is generated inside the rotor of solid cylindrical magnetic steel, and insufficient cooling leads to temperature rise and the risk of irreversible demagnetization of the magnetic steel.

[0004] In order to solve the above problems, the present invention provides a surface-mounted motor rotor, including a rotating shaft, wherein the rotating shaft has a central accommodating hole extending along its axial direction, a solid cylindrical magnet is installed in the central accommodating hole, and an annular magnet is mounted on the rotating shaft, and the annular magnet is mounted on the radial outer peripheral side of the solid cylindrical magnet.

[0005] In some embodiments, the rotating shaft includes a first shaft section, the first shaft section includes a shoulder section for axially limiting the annular magnetic steel and a sleeve for at least partially accommodating the solid cylindrical magnetic steel, the shoulder section is coaxial with the sleeve and is arranged in sequence along the axial direction of the rotating shaft, the shoulder section has a first flow channel, the sleeve has a second flow channel on the barrel wall, the first end of the first flow channel is connected to the second flow channel, the second flow channel has a first flow hole connected to the outer circumferential wall of the solid cylindrical magnetic steel and a second flow hole connected to the inner circumferential wall of the annular magnetic steel.

[0006] In some embodiments, the second flow channel extends axially along the sleeve and has a plurality of second flow channels, and the plurality of second flow channels are spaced apart around the circumference of the sleeve. Each second flow channel has a plurality of first flow holes and second flow holes, and the plurality of first flow holes and second flow holes are spaced apart along the length direction of the second flow channel.

[0007] In some embodiments, the first flow channel extends axially along the shoulder section, the first flow channel is connected to a plurality of the second flow channels respectively through third flow channels, and the third flow channels extend radially along the rotating shaft.

[0008] In some embodiments, the outer circumferential wall of the sleeve has a fourth flow channel extending along its axial direction, the fourth flow channel is a groove opening toward the inner circumferential wall of the annular magnetic steel, and the second flow hole is connected to the fourth flow channel; and / or, the inner circumferential wall of the sleeve has a fifth flow channel extending along its axial direction, the fifth flow channel is a groove opening toward the outer circumferential wall of the solid cylindrical magnetic steel, and the first flow hole is connected to the fifth flow channel.

[0009] In some embodiments, the outer circumferential wall of the sleeve also has a plurality of first annular grooves, the first annular grooves extend along the circumference of the sleeve and connect the two adjacent fourth flow channels, and the plurality of first annular grooves are arranged at axial intervals along the rotating shaft; and / or, the inner circumferential wall of the sleeve also has a plurality of second annular grooves, the second annular grooves extend along the circumference of the sleeve and connect the two adjacent fifth flow channels, and the plurality of second annular grooves are arranged at axial intervals along the rotating shaft.

[0010] In some embodiments, the first end of the first flow channel is further connected to an end surface of the solid cylindrical magnetic steel.

[0011] In some embodiments, the bottom wall of the sleeve has a plurality of first end flow channels connected to the first end of the first flow channel, the first end flow channels extend radially along the sleeve, and the plurality of first end flow channels are arranged at intervals along the circumference of the sleeve.

[0012] In some embodiments, the sleeve further has a first end annular flow channel on the bottom wall, and the first end annular flow channel connects two adjacent first end flow channels; and / or the flow area on the radial outer side of the first end flow channel is larger than the flow area on the radial inner side.

[0013] In some embodiments, the first end of the first flow channel is further connected to an end surface of the annular magnetic steel.

[0014] In some embodiments, the shoulder segment has a plurality of second end flow channels connected to the first end of the first flow channel on the end surface that contacts and cooperates with one end surface of the annular magnetic steel, and the second end flow channels extend radially along the sleeve, and the plurality of second end flow channels are arranged at intervals along the circumference of the sleeve.

[0015] In some embodiments, the shoulder section further has a second end annular flow channel on the end face that contacts and cooperates with one end face of the annular magnetic steel, and the second end annular flow channel connects two adjacent second end flow channels; and / or, the flow area on the radial outside of the second end flow channel is larger than the flow area on the radial inside thereof.

[0016] In some embodiments, a sleeve is mounted on the outer circumferential wall of the annular magnetic steel and the shaft shoulder segment, and a third flow hole is provided at a position of the sleeve corresponding to the second end flow channel, and the third flow hole is connected to the second end flow channel.

[0017] In some embodiments, the rotating shaft includes two sections of the first shaft sections, which are relative to each other to form an axial clamp on the solid cylindrical magnetic steel, and the second flow channels respectively provided by the two sections of the first shaft sections are respectively connected to each other in the axial direction of the rotating shaft.

[0018] In some embodiments, an impeller or a joint with a rotating function is disposed in the second end of the first flow channel.

[0019] The present invention also provides a motor, comprising the above-mentioned surface-mounted motor rotor.

[0020] The present invention provides a surface-mounted motor rotor and motor, which divide a solid cylindrical magnet arranged in the center hole of the rotating shaft in the prior art into a centrally arranged solid cylindrical magnet and an annular magnet surrounding the solid cylindrical magnet, that is, the large block of magnet is divided into a double-layer structure, which effectively reduces the eddy current loss inside the magnet, which is conducive to reducing the heat generation of the rotor magnet and thus reducing the temperature rise of the magnet, and can prevent the occurrence of irreversible demagnetization of the magnet to a certain extent. In addition, this double-layer structure of the magnet arrangement can improve the tensile strength of the rotor magnet while ensuring the magnetic properties of the motor, so that the upper limit of the speed is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the three-dimensional structure of the surface-mounted motor rotor according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the surface-mount motor rotor;

[0023] Figure 3 for Figure 1Schematic diagram of the internal structure of the surface-mount motor rotor (longitudinal section);

[0024] Figure 4 for Figure 1 Schematic diagram of the internal structure of the surface-mount motor rotor (cross section);

[0025] Figure 5 for Figure 1 Schematic diagram of the internal structure of the first shaft segment (longitudinal section);

[0026] Figure 6 for Figure 5 Right side view;

[0027] Figure 7 for Figure 1 Schematic diagram of the three-dimensional structure of the first shaft segment.

[0028] The reference numerals indicate:

[0029] 1. Solid cylindrical magnet; 2. Annular magnet; 31. First shaft section; 311. Shoulder section; 312. Sleeve; 301. First flow channel; 302. Second flow channel; 303. Third flow channel; 304. Fourth flow channel; 305. Fifth flow channel; 41. First flow hole; 42. Second flow hole; 51. First annular groove; 52. Second annular groove; 61. First end flow channel; 62. First end annular flow channel; 63. Second end flow channel; 64. Second end annular flow channel; 7. Sleeve; 71. Third flow hole. DETAILED DESCRIPTION

[0030] See also Figures 1 to 7As shown, according to an embodiment of the present invention, a surface-mounted motor rotor is provided, comprising a rotating shaft (not labeled in the figure), the rotating shaft having a central accommodating hole (not labeled in the figure) extending along its axial direction, a solid cylindrical magnet 1 being mounted in the central accommodating hole, an annular magnet 2 being mounted on the rotating shaft, and the annular magnet 2 being mounted on the radially outer peripheral side of the solid cylindrical magnet 1. In this technical solution, a solid cylindrical magnet 1 disposed in the central hole of the rotating shaft in the prior art is divided into a centrally disposed solid cylindrical magnet 1 and an annular magnet 2 mounted around the outer portion thereof, that is, the large block of magnet is divided into a double-layer structure, which effectively reduces the eddy current loss inside the magnet, which is beneficial to reducing the heat generation of the rotor magnet, thereby reducing the temperature rise of the magnet, and can prevent the occurrence of irreversible demagnetization of the magnet to a certain extent. In addition, this double-layer magnet arrangement can improve the tensile strength of the rotor magnet while ensuring the magnetic properties of the motor, thereby significantly improving the upper speed limit. Specifically, when the rotor rotates at high speed, the magnet is greatly affected by tensile stress. As the speed increases, the tensile stress on the magnet also increases. When the tensile stress reaches the upper limit, the magnet will break. If the double-layer structure in the present invention is adopted, it is equivalent to dividing the magnet into two layers, inner and outer layers, both inner and outer layers are protected by short shafts and sheaths. Under the same interference fit, its compressive stress is greatly increased. Therefore, when rotating at high speed, the magnet can withstand higher tensile stress than a single solid large magnet, thereby improving the upper limit of the speed.

[0031] In some embodiments, the rotating shaft includes a first shaft section 31, the first shaft section 31 includes a shoulder section 311 for axially limiting the annular magnetic steel 2 and a sleeve 312 for at least partially accommodating the solid cylindrical magnetic steel 1, the shoulder section 311 and the sleeve 312 are coaxial and arranged in sequence along the axial direction of the rotating shaft, the shoulder section 311 has a first flow channel 301, the sleeve 312 has a second flow channel 302 on the wall, the first end of the first flow channel 301 is connected to the second flow channel 302, the second flow channel 302 has a first flow hole 41 connected to the outer circumferential wall of the solid cylindrical magnetic steel 1 and a second flow hole 42 connected to the inner circumferential wall of the annular magnetic steel 2. In this technical solution, the cooling fluid can enter the second flow channel 302 connected to the first flow channel 301 and be diverted within the second flow channel 302 through the first flow holes 41 and the second flow holes 42 to the solid cylindrical magnetic steel 1 and the annular magnetic steel 2 on the inner and outer sides of the sleeve 312, thereby effectively cooling the magnetic steel and reducing the occurrence of large temperature rise. In a preferred embodiment, the second flow channel 302 extends along the axial direction of the sleeve 312 and has multiple second flow channels 302. The multiple second flow channels 302 are arranged at intervals around the circumference of the sleeve 312. Each second flow channel 302 has multiple first flow holes 41 and second flow holes 42. The multiple first flow holes 41 and second flow holes 42 are arranged at intervals along the length direction of the second flow channel 302. In this way, a circumferential surround of the magnetic steel can be formed, further improving the cooling effect on the magnetic steel.

[0032] In some embodiments, the first flow channel 301 extends axially along the shoulder section 311. The first flow channel 301 is connected to each of the plurality of second flow channels 302 via a third flow channel 303, which extends radially along the shaft. In this technical solution, the third flow channel 303 provides a one-to-one flow distribution between the first flow channel 301 and the plurality of second flow channels 302, resulting in more balanced distribution of the cooling medium and a more uniform circumferential temperature of the rotor after cooling.

[0033] The outer circumferential wall of the sleeve 312 has a fourth flow channel 304 extending along its axial direction, and the fourth flow channel 304 is a groove opening toward the inner circumferential wall of the annular magnetic steel 2, and the second flow hole 42 is connected to the fourth flow channel 304; and / or, the inner circumferential wall of the sleeve 312 has a fifth flow channel 305 extending along its axial direction, and the fifth flow channel 305 is a groove opening toward the outer circumferential wall of the solid cylindrical magnetic steel 1, and the first flow hole 41 is connected to the fifth flow channel 305. Through the fourth flow channel 304, the cooling medium flowing into the second flow hole 42 can have a larger contact area with the inner circumferential wall of the annular magnetic steel 2. Similarly, through the fifth flow channel 305, the cooling medium flowing into the first flow hole 41 can have a larger contact area with the outer circumferential wall of the solid cylindrical magnetic steel 1, thereby improving the cooling effect.

[0034] In some embodiments, the outer circumferential wall of the sleeve 312 further has a plurality of first annular grooves 51, which extend along the circumference of the sleeve 312 and connect the two adjacent fourth flow channels 304, and the plurality of first annular grooves 51 are arranged at intervals along the axial direction of the rotating shaft. Similarly, the inner circumferential wall of the sleeve 312 further has a plurality of second annular grooves 52, which extend along the circumference of the sleeve 312 and connect the two adjacent fifth flow channels 305, and the plurality of second annular grooves 52 are arranged at intervals along the axial direction of the rotating shaft. The design of the first annular grooves 51 and the second annular grooves 52 can more comprehensively cool the corresponding magnetic steel.

[0035] In another embodiment, the first end of the first flow channel 301 is further connected to an end surface of the solid cylindrical magnetic steel 1, thereby effectively cooling the end of the solid cylindrical magnetic steel 1. Specifically, the bottom wall of the sleeve 312 is provided with multiple first end flow channels 61 connected to the first end of the first flow channel 301. The first end flow channels 61 extend radially along the sleeve 312 and are spaced apart circumferentially around the sleeve 312. The cooling medium in the first flow channel 301 is guided to the end of the magnetic steel through the multiple first end flow channels 61, effectively cooling the end of the magnetic steel. As a preferred embodiment, the bottom wall of the sleeve 312 is further provided with a first end annular flow channel 62, which connects the two adjacent first end flow channels 61, thereby increasing the contact area between the cooling medium and the end of the magnet, and improving the cooling effect; the flow area on the radial outer side of the first end flow channel 61 is larger than the flow area on the radial inner side, so that the contact area of ​​the cooling medium roughly matches the area of ​​the end face of the magnet, further ensuring the cooling of the end of the magnet.

[0036] In another preferred embodiment, the first end of the first flow channel 301 is also connected to an end face of the annular magnetic steel 2. Specifically, the end face of the shoulder section 311 that contacts and cooperates with an end face of the annular magnetic steel 2 has a plurality of second end flow channels 63 that are connected to the first end of the first flow channel 301. The second end flow channels 63 extend radially along the sleeve 312, and the plurality of second end flow channels 63 are arranged at intervals along the circumference of the sleeve 312. The cooling medium in the first flow channel 301 can be guided to the end of the magnetic steel through the plurality of second end flow channels 63, thereby achieving effective cooling of the end of the magnetic steel. As a preferred implementation, the shoulder section 311 further includes a second end annular flow channel 64 on the end surface that contacts one end of the annular magnet 2. This second end annular flow channel 64 connects to two adjacent second end flow channels 63, increasing the contact area between the cooling medium and the magnet end, thereby enhancing the cooling effect. The radially outer flow area of ​​the second end flow channel 63 is larger than the radially inner flow area, ensuring that the contact area of ​​the cooling medium roughly matches the area of ​​the magnet end, further ensuring cooling of the magnet end. In this way, the above-mentioned technical solution achieves all-round cooling of the circumferential sidewalls and ends of the magnet, providing more complete cooling and better cooling effects.

[0037] In some embodiments, a sleeve 7 is provided on the outer circumferential wall of the annular magnetic steel 2 and the shaft shoulder section 311. A third flow hole 71 is provided at a position of the sleeve 7 corresponding to the second end flow channel 63. The third flow hole 71 is connected to the second end flow channel 63. In this way, the cooling medium introduced into the first flow channel 301 can be discharged from the interior of the rotor through the third flow hole 71 after heat exchange with the solid cylindrical magnetic steel 1 and the annular magnetic steel 2, thereby realizing the circulation of the cooling medium.

[0038] The rotating shaft may include only one first shaft section 31. In this case, it is understood that the inner hole and the length of the wall of the sleeve 312 of the first shaft section 31 may match the length of the solid cylindrical magnetic steel 1 and the length of the annular magnetic steel 2 to ensure the relative stability of the two magnetic steels in the axial, radial and circumferential directions, and another shaft section is used to form a sealed connection with the open end of the sleeve 312 of the first shaft section 31. A corresponding cooling medium flow channel may also be provided on the shaft section to form an inlet and outlet circulation of the cooling medium. In another feasible embodiment, the rotating shaft includes two first shaft sections 31, and the two first shaft sections 31 The solid cylindrical magnetic steel 1 is axially clamped relative to each other, and the second flow channels 302 respectively provided on the two first shaft segments 31 are connected to each other in the axial direction of the rotating shaft. At this time, the first flow channel 301 provided on the first shaft segment 31 on one side serves as an inlet flow channel for the cooling medium, while the first flow channel 301 provided on the first shaft segment 31 on the other side serves as an outlet flow channel for the cooling medium. Of course, when the sheath 7 has a third flow hole 71, the first flow channels 301 respectively provided on the two segments can both serve as inlet flow channels for the cooling medium, while the third flow hole 71 serves as an outlet channel for the cooling medium.

[0039] The cooling medium can be, for example, relatively low-temperature compressed air or refrigerant, or in some cases, relatively low-temperature lubricating oil. As a specific implementation, an impeller (not shown) is disposed within the second end of the first flow channel, which rotates with the shaft to introduce airflow, or a rotating joint is provided to communicate with an external cooling medium.

[0040] It is understandable that due to the setting method of the sleeve 312, the first rotating shaft needs to use magnetic conductive materials to ensure efficient output of magnetic properties. At the same time, in order to reduce magnetic leakage, magnetic isolation rings and other parts can be added to the outer end surfaces of the two sections of the first rotating shaft away from the magnetic steel to prevent magnetic leakage.

[0041] The aforementioned solid cylindrical magnet 1 and annular magnet 2 can be made by sintering materials such as SmCo, rare earth NdFeB or ferrite. The material should be selected according to the actual application requirements of the rotor. The aforementioned magnet is radially parallel oriented. After the magnet is magnetized, it will generate an air gap magnetic field with good sinusoidality in the motor, reducing harmonics, vibration, etc. during the operation of the motor.

[0042] The sleeve 312 can be fitted with the solid cylindrical magnetic steel 1 and the annular magnetic steel 2 from a small gap to an interference fit. The higher the speed, the greater the interference fit. The sheath 7 can be made of a non-magnetic alloy or wrapped with carbon fiber to ensure rotor strength.

[0043] According to an embodiment of the present invention, a motor is further provided, comprising the above-mentioned surface-mounted motor rotor.

[0044] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A surface-mounted motor rotor, characterized in that: The invention relates to a rotating shaft, wherein the rotating shaft has a central accommodating hole extending along its axial direction, a solid cylindrical magnetic steel (1) is installed in the central accommodating hole, an annular magnetic steel (2) is sleeved on the rotating shaft, and the annular magnetic steel (2) is sleeved on the radial outer peripheral side of the solid cylindrical magnetic steel (1); the rotating shaft comprises a first shaft section (31), the first shaft section (31) comprises a shaft shoulder section (311) for axially limiting the annular magnetic steel (2), and the shaft shoulder section (311) has a first flow channel (301); a first end of the first flow channel (301) is communicated with an end face of the solid cylindrical magnetic steel (1); the first shaft section (31) further comprises a sleeve (312) for at least partially accommodating the solid cylindrical magnetic steel (1), the bottom wall of the sleeve (312) comprising a plurality of first end flow channels (61) connected to the first end of the first flow channel (301), the first end flow channels (61) extending radially along the sleeve (312), and the plurality of first end flow channels (61) being arranged at intervals along the circumference of the sleeve (312); the bottom wall of the sleeve (312) further comprising a first end annular flow channel (62), the first end annular flow channel (62) being connected to two adjacent first end flow channels (61).

2. The surface-mounted motor rotor according to claim 1, characterized in that: The shaft shoulder section (311) is coaxial with the sleeve (312) and is sequentially arranged along the axial direction of the rotating shaft. The sleeve (312) has a second flow channel (302) on its wall. The first end of the first flow channel (301) is in communication with the second flow channel (302). The second flow channel (302) has a first flow hole (41) in communication with the outer circumferential wall of the solid cylindrical magnetic steel (1) and a second flow hole (42) in communication with the inner circumferential wall of the annular magnetic steel (2).

3. The surface-mounted motor rotor according to claim 2, characterized in that: The second flow channel (302) extends along the axial direction of the sleeve (312) and has a plurality of second flow channels (302). The plurality of second flow channels (302) are arranged at intervals around the circumference of the sleeve (312). Each second flow channel (302) has a plurality of first flow holes (41) and second flow holes (42). The plurality of first flow holes (41) and second flow holes (42) are arranged at intervals along the length direction of the second flow channel (302).

4. The surface-mounted motor rotor according to claim 3, characterized in that: The first flow channel (301) extends axially along the shaft shoulder section (311), and the first flow channel (301) is connected to a plurality of the second flow channels (302) via third flow channels (303), respectively. The third flow channels (303) extend radially along the rotating shaft.

5. The surface-mounted motor rotor according to claim 3, characterized in that: The outer circumferential wall of the sleeve (312) has a fourth flow channel (304) extending along its axial direction, the fourth flow channel (304) is a groove opening toward the inner circumferential wall of the annular magnetic steel (2), and the second flow hole (42) is connected to the fourth flow channel (304); and / or, the inner circumferential wall of the sleeve (312) has a fifth flow channel (305) extending along its axial direction, the fifth flow channel (305) is a groove opening toward the outer circumferential wall of the solid cylindrical magnetic steel (1), and the first flow hole (41) is connected to the fifth flow channel (305).

6. The surface-mounted motor rotor according to claim 5, characterized in that: The outer circumferential wall of the sleeve (312) further comprises a plurality of first annular grooves (51), the first annular grooves (51) extending along the circumference of the sleeve (312) and connecting the two adjacent fourth flow channels (304), and the plurality of first annular grooves (51) are arranged at intervals along the axial direction of the rotating shaft; and / or, the inner circumferential wall of the sleeve (312) further comprises a plurality of second annular grooves (52), the second annular grooves (52) extending along the circumference of the sleeve (312) and connecting the two adjacent fifth flow channels (305), and the plurality of second annular grooves (52) are arranged at intervals along the axial direction of the rotating shaft.

7. The surface-mounted motor rotor according to claim 1, characterized in that: The flow area on the radially outer side of the first end flow channel (61) is larger than the flow area on the radially inner side thereof.

8. The surface-mounted motor rotor according to claim 1, characterized in that: The first end of the first flow channel (301) is also in communication with an end surface of the annular magnetic steel (2).

9. The surface-mounted motor rotor according to claim 8, characterized in that: The shoulder section (311) has a plurality of second end flow channels (63) on its end face that contacts and cooperates with one end face of the annular magnetic steel (2), which are connected to the first end of the first flow channel (301). The second end flow channels (63) extend radially along the sleeve (312), and the plurality of second end flow channels (63) are arranged at intervals along the circumference of the sleeve (312).

10. The surface-mounted motor rotor according to claim 9, characterized in that: The shoulder section (311) further comprises a second end annular flow channel (64) on the end face that contacts and cooperates with one end face of the annular magnetic steel (2), wherein the second end annular flow channel (64) is connected to two adjacent second end flow channels (63); and / or, the flow area on the radial outer side of the second end flow channel (63) is greater than the flow area on the radial inner side thereof.

11. The surface-mounted motor rotor according to claim 10, characterized in that: A sheath (7) is sleeved on the outer circumferential wall of the annular magnetic steel (2) and the shaft shoulder section (311); a third flow hole (71) is provided at a position of the sheath (7) corresponding to the second end flow channel (63); and the third flow hole (71) is communicated with the second end flow channel (63).

12. The surface-mounted motor rotor according to claim 1, characterized in that: The rotating shaft comprises two sections of the first shaft sections (31), the two sections of the first shaft sections (31) are relative to each other to form an axial clamping for the solid cylindrical magnetic steel (1), and the second flow channels (302) respectively provided in the two sections of the first shaft sections (31) are respectively connected and connected in the axial direction of the rotating shaft.

13. The surface-mounted motor rotor according to claim 1, characterized in that: An impeller or a joint with a rotating function is provided in the second end of the first flow channel.

14. A motor, characterized in that: A surface-mounted motor rotor comprising the rotor of any one of claims 1 to 13.

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