Flat ultra-thin disc type motor rotor with low iron loss

Abstract

The invention relates to the field of disc type motors, in particular to a low-iron-loss flat ultra-thin disc type motor rotor which comprises a rotor mechanism, magnetic steel and an isolation mechanism. The magnetic steel is arranged on the rotor mechanism; the rotor mechanism is used for reducing eddy current loss; the isolation mechanism is arranged on the rotor mechanism, and the isolation mechanism is used for reducing iron loss; the rotor mechanism comprises a first bracket and a second bracket, the first bracket is in glued connection with the second bracket through an insulating part, the magnetic steel is fixedly mounted on the first bracket, and a surrounding edge is arranged at the side part of the second bracket; when the first bracket is installed in place, the surface of the first bracket is flush with the edge of the surrounding edge. According to the invention, an axial conductive path between the first bracket and the second bracket can be blocked, eddy current is prevented from penetrating up and down to form a large loop, and iron loss is reduced in the axial direction.

Description

A low-iron-loss, flat, ultra-thin disc motor rotor Technical Field

[0001] This invention belongs to the field of disc motor technology, and specifically relates to a low-iron-loss, flat, ultra-thin disc motor rotor. Background Technology

[0002] Disc motors have advantages such as flat and ultra-thin structure, high power density, and short axial dimension, and are increasingly widely used in space-constrained transmission applications. Among them, the rotor of the disc motor, as the core of the magnetic circuit and torque output component, directly affects the iron loss, temperature rise, transmission reliability, and service life of the motor.

[0003] A search revealed a patent document titled "Disc Motor Rotor," with citation publication number CN112865369B and publication date of April 11, 2025. The document includes: a rotor bracket comprising a bracket body, the bracket body being a circular plate structure with a central shaft hole; multiple grooves corresponding to the upper and lower end faces of the bracket body, arranged circumferentially along the bracket body; grooves extending axially along the bracket body, forming openings at the outer edge of the bracket body; and multiple magnets of matching shape to the grooves, inserted into the corresponding grooves through the openings; and an annular clamp fixedly fitted around the outer periphery of the rotor bracket. A first extension plate and a second extension plate are respectively arranged around the outer edges of the upper and lower end faces of the annular clamp. The upper end face of the first extension plate has a first blade, and the lower end face of the second extension plate has a second blade. The disc motor rotor of this invention is easy and quick to install, the magnets are not easy to fall off, and the heat dissipation effect is good.

[0004] Most existing flat, ultra-thin disc motor rotors adopt an integral iron core structure. During motor operation, the alternating magnetic field generated by the stator will induce circumferential and axial eddy currents inside the rotor iron core. Especially in the area where the magnets are installed, the magnetic flux density is high and the magnetic field is intensely alternating, which can easily form a large area of ​​closed eddy current path, resulting in large rotor iron loss and affecting motor efficiency and operational stability. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a low-iron-loss, flat, ultra-thin disc motor rotor, comprising a rotor mechanism, magnets, and an isolation mechanism; the magnets are disposed on the rotor mechanism; the rotor mechanism is used to reduce eddy current losses; the isolation mechanism is disposed on the rotor mechanism and is used to reduce iron losses; the rotor mechanism includes a first bracket and a second bracket, the first bracket being glued to the second bracket via an insulating component, the magnets being fixedly mounted on the first bracket, and the second bracket having a surrounding edge on its side; when the first bracket is installed in place, the surface of the first bracket is flush with the edge of the surrounding edge.

[0006] In one embodiment of this application, the isolation mechanism includes a spacer and a strip groove, the strip groove being formed on the first bracket, and the spacer being disposed within the strip groove.

[0007] In one embodiment of this application, a plurality of strip grooves are provided, and the strip grooves are arranged in a circular array on the first bracket. The first bracket is divided into a plurality of support blocks by the strip grooves, and the magnet is fixedly installed on the support blocks.

[0008] In one embodiment of this application, the first bracket has a protruding tooth on the side away from the magnet, and the second bracket has a groove on its side that engages with the protruding tooth; when the first bracket and the second bracket are in contact, the protruding tooth engages with the groove; when the first bracket and the second bracket are separated, the protruding tooth separates from the groove.

[0009] In one embodiment of this application, a boss is provided at the center of the second bracket, and a second through hole is provided at the center of the second bracket, passing through the boss, and an arc-shaped groove is provided on the inner wall of the second through hole.

[0010] In one embodiment of this application, a first through hole is provided at the center of the first bracket, a guide groove is provided on the inner wall of the first through hole, a guide block is provided on the side wall of the boss, the guide block is slidably engaged with the guide groove, and the first through hole is slidably engaged with the boss.

[0011] In one embodiment of this application, the first bracket has a first groove, the magnet is embedded in the first groove, and the distance between the two sides of the first groove and the adjacent strip groove is the same.

[0012] In one embodiment of this application, a second groove is provided on the side of the support block, and the inner wall of the first groove is in contact with the bottom of the second groove.

[0013] In one embodiment of this application, the end of the strip groove near the center of the first bracket is provided with an insertion hole, one end of the spacer is inserted into the insertion hole, and a sliding groove is provided on the side wall of the strip groove, and the edge of the spacer is slidably installed in the sliding groove.

[0014] In one embodiment of this application, the spacer has a first heat-conducting hole in its axial direction, and a second heat-conducting hole is provided on the side of the spacer away from the second bracket. The first heat-conducting hole and the second heat-conducting hole are connected, and a heat dissipation hole is provided on the side of the edging that is connected to the first heat-conducting hole.

[0015] The beneficial effects of the present invention are: 1. By dividing the rotor into a first bracket and a second bracket and bonding them together with epoxy glue, the strong eddy current region is separated separately. By separating the first bracket and the second bracket with epoxy glue, the axial conductive path between the first bracket and the second bracket can be blocked, preventing the eddy current from forming a large loop by passing through it vertically, thereby reducing iron loss axially.

[0016] 2. By creating strip grooves on the first bracket, the first bracket is circumferentially divided into blocks. Based on a layered structure, only the first bracket where eddy currents are concentrated is cut into blocks to block the eddy currents. A large current path cannot be formed circumferentially, while the second bracket remains intact. This achieves eddy current suppression in the strong eddy current region. While ensuring low iron loss, the structural strength of the lower second bracket is preserved, significantly reducing the processing difficulty. Through interlayer insulation, the axial conductive path between the first and second brackets is blocked, cutting off the eddy current path axially. Combined with the strip grooves to divide the first bracket into blocks, circumferential and axial dual separation of eddy currents is achieved, which can reduce the overall iron loss of the rotor.

[0017] 3. When the first bracket is fixed on the second bracket, the protruding teeth engage in the groove. During the gluing and fixing, the contact area between the first bracket and the second bracket can be increased, thereby increasing the stability and gluing strength after gluing. When the rotor rotates, the protruding teeth engage in the groove, thereby increasing the friction between the first bracket and the second bracket during rotation, thus maintaining the stability of the first bracket during rotation.

[0018] 4. By using the boss, the contact range between the second bracket and the output shaft can be increased. The arc groove and the boss are in contact, and the arc groove and the boss are interference-fitted. Compared with the direct interference fit between the round hole and the round shaft, the use of the arc groove and the boss can effectively improve the torque transmission and improve the transmission reliability of the rotor and the shaft. It is less likely to slip under high speed and high temperature conditions.

[0019] 5. When the rotor rotates, the centrifugal force generated by the rotor rotation forms an active convection heat dissipation channel with axial air intake and radial air exhaust, which can dissipate the heat of the magnet and support block area, reduce the rotor temperature rise, and improve the reliability of the magnet and the bonding structure.

[0020] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 shows a schematic diagram of the structure according to an embodiment of the present invention.

[0023] Figure 2 shows an exploded view of the first bracket and the second bracket according to an embodiment of the present invention.

[0024] Figure 3 shows an isometric schematic diagram of the first bracket according to an embodiment of the present invention.

[0025] Figure 4 shows a schematic diagram of the perimeter isometric projection according to an embodiment of the present invention.

[0026] Figure 5 shows an isometric schematic diagram of the spacer bar according to an embodiment of the present invention.

[0027] Figure 6 shows a schematic diagram of part A in Figure 3 according to an embodiment of the present invention.

[0028] Figure 7 shows a schematic diagram of part B in Figure 3 according to an embodiment of the present invention.

[0029] Figure 8 shows an exploded view of the boss and output shaft according to an embodiment of the present invention.

[0030] Figure 9 shows a schematic diagram of section C in Figure 4 according to an embodiment of the present invention.

[0031] In the diagram: 1. Rotor mechanism; 101. First bracket; 1011. Raised tooth; 1012. Groove; 102. Second bracket; 1021. Boss; 1022. Second through hole; 1023. Arc groove; 103. Surrounding edge; 104. Insulating component; 2. Magnet; 3. Isolation mechanism; 301. Spacer bar; 302. Strip groove; 4. First through hole; 5. Guide groove; 6. Guide block; 7. First recessed groove; 8. Support block; 9. Second recessed groove; 11. Insertion hole; 12. First heat conduction hole; 13. Second heat conduction hole; 14. Heat dissipation hole; 15. Output shaft; 16. Protrusion; 17. Slide groove. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] This invention provides a low-iron-loss, flat, ultra-thin disc motor rotor, as shown in Figures 1-9. It includes a rotor mechanism 1, magnets 2, and an isolation mechanism 3. The magnets 2 are mounted on the rotor mechanism 1. The rotor mechanism 1 is used to reduce eddy current losses. The isolation mechanism 3 is mounted on the rotor mechanism 1 and is used to reduce iron losses. The rotor mechanism 1 includes a first bracket 101 and a second bracket 102. The first bracket 101 is glued to the second bracket 102 via an insulating member 104. The magnets 2 are fixedly mounted on the first bracket 101. The side of the second bracket 102 is provided with a surrounding edge 103. When the first bracket 101 is installed in place, the surface of the first bracket 101 is flush with the edge of the surrounding edge 103.

[0034] It should be noted that the insulating component 104 is made of epoxy resin.

[0035] By adopting the above scheme, the rotor is divided into a first bracket 101 and a second bracket 102 and glued together with epoxy resin. The strong eddy current region is separated separately (i.e., the first bracket 101 on which the magnet 2 is installed). By separating the first bracket 101 and the second bracket 102 with epoxy resin, the axial conductive path between the first bracket 101 and the second bracket 102 can be blocked, preventing the eddy current from forming a large loop by passing through it vertically, thereby reducing iron loss axially.

[0036] For example, referring to Figures 2, 3, 4 and 8, the isolation mechanism 3 includes a spacer 301 and a strip groove 302. The strip groove 302 is formed on the first bracket 101, and the spacer 301 is disposed in the strip groove 302.

[0037] It should be noted that the spacer 301 is set as an insulating strip; after the spacer 301 fills the strip groove 302, it can block the local conductive connection of the support blocks 8 on both sides of the strip groove 302, prevent the eddy current path from recovering, ensure that the strip groove 302 can cut the strong eddy current area, and ensure that the strip groove 302 can block the recovery of the eddy current path; the strip groove 302 forms an insulating gap between magnets, which is used to block the transverse local eddy current path formed between adjacent magnets on the surface of the support block 8, and suppress the local eddy current loss caused by the alternating magnetic flux between magnets; the spacer 301 is set in the strip groove 302 to keep the gap insulating, prevent the inter-pole eddy current path from recovering and conducting, thereby reducing the iron loss in the magnet installation area; there are a number of strip grooves 302, and the strip grooves 302 are arranged in a ring array on the first bracket 101. The first bracket 101 is divided into a number of support blocks 8 by the strip grooves 302, and the magnets 2 are fixedly installed on the support blocks 8.

[0038] It should be noted that the number of strip grooves 302 is the same as the number of spacers 301.

[0039] By adopting the above scheme, the first bracket 101 is divided into circumferential blocks by opening a strip groove 302 on the first bracket 101. Based on the layered structure, only the magnet 2 mounting layer (i.e., the first bracket 101) where eddy currents are concentrated is cut into blocks to block the eddy currents. A large current path cannot be formed in the circumferential direction, and the second bracket 102 remains intact, thereby suppressing the eddy currents in the strong eddy current region. While ensuring low iron loss, the structural strength of the lower second bracket is preserved, which greatly reduces the processing difficulty. Through interlayer insulation, the axial conductive path between the first bracket 101 and the second bracket 102 is blocked, and the eddy current path is cut off from the axial direction. With the help of the strip groove 302 to divide the first bracket 101 into blocks, the eddy current treatment is achieved by separating the circumferential and axial directions, which can reduce the overall iron loss of the rotor.

[0040] Specifically, the first bracket 101 has a protruding tooth 1011 on the side away from the magnet 2, and the second bracket 102 has a groove 1012 on its side that engages with the protruding tooth 1011; when the first bracket 101 and the second bracket 102 are in contact, the protruding tooth 1011 engages with the groove 1012; when the first bracket 101 and the second bracket 102 are separated, the protruding tooth 1011 separates from the groove 1012.

[0041] Using the above scheme, when the first bracket 101 is fixed on the second bracket 102, the protruding teeth 1011 engage in the groove 1012. During the gluing and fixing, the contact area between the first bracket 101 and the second bracket 102 can be increased, thereby increasing the stability and gluing strength after gluing. When the rotor rotates, the protruding teeth 1011 engage in the groove 1012, thereby increasing the friction between the first bracket 101 and the second bracket 102 during rotation, thus maintaining the stability of the first bracket 101 during rotation.

[0042] Specifically, a boss 1021 is provided at the center of the second bracket 102, and a second through hole 1022 is provided at the center of the second bracket 102, which passes through the boss 1021. An arc-shaped groove 1023 is provided on the inner wall of the second through hole 1022.

[0043] It should be noted that the boss 1021 and the second bracket 102 are integrated into one structure; the output shaft 15, which is connected to the boss 1021, is provided with a protrusion 16 that fits into the arc groove 1023; during installation, the output shaft 15 is inserted into the second through hole 1022, the protrusion 16 on the surface of the output shaft 15 slides into the arc groove 1023, and the boss 1021 is fixed on the output shaft 15 by interference fit.

[0044] By adopting the above solution, the contact range between the second bracket 102 and the output shaft 15 can be increased by using the boss 1021. The arc groove 1023 is attached to the boss 16, and the arc groove 1023 and the boss 16 are interference-fitted. Compared with the direct interference fit between the round hole and the round shaft, the use of the arc groove 1023 and the boss 16 can effectively improve the torque transmission and enhance the transmission reliability of the rotor and the shaft. Slippage is less likely to occur under high speed and high temperature conditions.

[0045] Specifically, referring to Figures 6 and 9, a first through hole 4 is provided at the center of the first bracket 101, and a guide groove 5 is provided on the inner wall of the first through hole 4. A guide block 6 is provided on the side wall of the boss 1021. The guide block 6 is slidably engaged with the guide groove 5, and the first through hole 4 is slidably engaged with the boss 1021. The first bracket 101 can be assembled onto the second bracket 102 by sliding the first through hole 4 onto the boss 1021 and then inserting the guide block 6 into the guide groove 5. When transmitting power to the output shaft 15, the boss 1021 acts as the main transmission body to drive the output shaft 15 to rotate, while the first bracket 101 transmits power through the glued part, the tooth 1011 and the groove 1012, and the guide block 6 and the guide groove 5, so that the second bracket 102 can transmit torque.

[0046] Specifically, referring to Figures 2 and 3, the first bracket 101 has a first groove 7, and the magnet 2 is embedded in the first groove 7. The distance between the two sides of the first groove 7 and the adjacent strip groove 302 is the same. The side of the support block 8 is provided with a second groove 9, and the inner wall of the first groove 7 is in contact with the bottom of the second groove 9. In order to increase the strength of the first bracket 101 and the second bracket 102 after bonding, by adding the first groove 7 and the second groove 9 to the first bracket 101 and the second bracket 102, the contact area of ​​the first bracket 101 and the second bracket 102 can be increased, thereby further increasing the bonding area of ​​the first bracket 101 and the second bracket 102 and improving the stability of the first bracket 101 and the second bracket 102 after bonding.

[0047] Specifically, referring to Figures 6 and 7, the end of the strip groove 302 near the center of the first bracket 101 is provided with an insertion hole 11. One end of the spacer 301 is inserted into the insertion hole 11. A sliding groove 17 is provided on the side wall of the strip groove 302, and the edge of the spacer 301 is slidably installed in the sliding groove 17. When installing the spacer 301, insert the spacer 301 into the strip groove 302 along the sliding groove 17, and then insert the end of the spacer 301 into the insertion hole 11 and tighten it. After installation, the first bracket 101 is fixed in the second bracket 102, and the inner wall of the rim 103 is attached to one end of the spacer 301, restricting the spacer 301 in the strip groove 302, which makes it convenient for the user to install the spacer 301.

[0048] For example, referring to Figures 5 and 8, the spacer 301 has a first heat conduction hole 12 in its axial direction, and a second heat conduction hole 13 is provided on the side of the spacer 301 away from the second bracket 102. The first heat conduction hole 12 and the second heat conduction hole 13 are connected. The side of the circumference 103 has a heat dissipation hole 14 that is connected to the first heat conduction hole 12.

[0049] By adopting the above scheme, when the rotor rotates, the centrifugal force generated by the rotor rotation forms an active convection heat dissipation channel with axial air intake and radial air exhaust, which can dissipate the heat in the area of ​​magnet 2 and support block 8, reduce rotor temperature rise, and improve the reliability of magnet 2 and bonding structure.

[0050] In summary, this application has the following beneficial effects: by dividing the rotor into a first bracket 101 and a second bracket 102 and bonding them together with epoxy resin, the strong eddy current region is separated. By separating the first bracket 101 and the second bracket 102 with epoxy resin, the axial conductive path between the first bracket 101 and the second bracket 102 can be blocked, preventing the eddy current from forming a large loop and reducing iron loss axially. By opening a strip groove 302 on the first bracket 101, the first bracket 101 is circumferentially divided into blocks, based on a layered structure, only... The first bracket 101, where eddy currents are concentrated, is cut into sections to block the eddy currents, preventing the formation of a large current path in the circumferential direction. The second bracket 102 remains intact, achieving eddy current suppression in the strong eddy current region. While ensuring low iron loss, the structural strength of the lower second bracket is preserved, significantly reducing processing difficulty. Through interlayer insulation, the axial conductive path between the first bracket 101 and the second bracket 102 is blocked, cutting off the eddy current path axially. Combined with the strip groove 302, the first bracket 101 is divided into sections, achieving dual circumferential and axial eddy current separation treatment, which can reduce the overall iron loss of the rotor. When the first bracket 101 is fixed to the second bracket 102, the protruding teeth 1011 engage in the groove 1012. During the gluing process, this increases the contact area between the first bracket 101 and the second bracket 102, thereby increasing the stability and strength of the bond. When the rotor rotates, the protruding teeth 1011 engage in the groove 1012, increasing the friction between the first bracket 101 and the second bracket 102 during rotation, thus maintaining the stability of the first bracket 101 during rotation. Furthermore, the centrifugal force generated by the rotor rotation during rotation creates an active axial air intake and radial air exhaust system. The convection heat dissipation channel can dissipate heat from the area of ​​magnet 2 and support block 8, reduce rotor temperature rise, and improve the reliability of magnet 2 and bonding structure. The use of boss 1021 can increase the contact range between second support 102 and output shaft 15. The arc groove 1023 is attached to the boss 16, and the arc groove 1023 and the boss 16 are interference connected. Compared with the direct interference fit between round hole and round shaft, the use of arc groove 1023 and boss 16 can effectively improve torque transmission and improve the transmission reliability of rotor and shaft. It is less likely to slip under high speed and high temperature conditions.

[0051] Based on the aforementioned low-iron-loss flat ultra-thin disc motor rotor, this invention also proposes an assembly method for a low-iron-loss flat ultra-thin disc motor rotor. Exemplarily, the assembly method includes: when assembling the rotor, inserting the spacer 301 along the sliding groove 17 into the strip groove 302, and then inserting the end of the spacer 301 into the insertion hole 11 and tightening it; then embedding the magnet into the first groove of the first bracket; coating the surface of the second bracket and the inner wall of the surrounding edge with epoxy resin, with a thickness of 0.6-1mm; aligning the guide groove with the guide block, pushing the first through hole of the first bracket onto the boss, pushing the first bracket so that the first bracket and the second bracket are tightly attached, and then pressing the first bracket so that the surface of the first bracket is flush with the edge of the surrounding edge; after the epoxy resin dries, removing excess epoxy resin to ensure unobstructed heat dissipation holes.

[0052] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-iron-loss, flat, ultra-thin disc motor rotor, characterized in that: The system includes a rotor mechanism (1), a magnet (2), and an isolation mechanism (3); the magnet (2) is disposed on the rotor mechanism (1); the rotor mechanism (1) is used to reduce eddy current losses; the isolation mechanism (3) is disposed on the rotor mechanism (1) and is used to reduce iron losses; the rotor mechanism (1) includes a first bracket (101) and a second bracket (102), the first bracket (101) being glued to the second bracket (102) by an insulating member (104). The magnet (2) is fixedly installed on the first bracket (101), and the side of the second bracket (102) is provided with a rim (103); when the first bracket (101) is installed in place, the surface of the first bracket (101) is flush with the edge of the rim (103); the isolation mechanism (3) includes a spacer (301) and a strip groove (302), the strip groove (302) is opened on the first bracket (101), and the spacer (301) is disposed in the strip groove (302).

2. The low-iron-loss, flat, ultra-thin disc motor rotor according to claim 1, characterized in that: The strip groove (302) is provided in a plurality of ways, and the strip groove (302) is arranged in a ring array on the first bracket (101). The first bracket (101) is divided into a plurality of support blocks (8) by the strip groove (302), and the magnet (2) is fixedly installed on the support block (8).

3. The low-iron-loss, flat, ultra-thin disc motor rotor according to claim 1, characterized in that: The first bracket (101) has a protruding tooth (1011) on the side away from the magnet (2), and the second bracket (102) has a groove (1012) on its side that engages with the protruding tooth (1011); when the first bracket (101) and the second bracket (102) are in contact, the protruding tooth (1011) engages with the groove (1012); when the first bracket (101) and the second bracket (102) are separated, the protruding tooth (1011) separates from the groove (1012).

4. The low-iron-loss, flat, ultra-thin disc motor rotor according to claim 1, characterized in that: The second bracket (102) has a boss (1021) at its center, and a second through hole (1022) is provided at the center of the second bracket (102) through the boss (1021). An arc groove (1023) is provided on the inner wall of the second through hole (1022).

5. A low-iron-loss, flat, ultra-thin disc motor rotor according to claim 4, characterized in that: The first bracket (101) has a first through hole (4) at its center. The inner wall of the first through hole (4) has a guide groove (5). The side wall of the boss (1021) has a guide block (6). The guide block (6) is slidably engaged with the guide groove (5). The first through hole (4) is slidably engaged with the boss (1021).

6. A low-iron-loss, flat, ultra-thin disc motor rotor according to claim 2, characterized in that: The first bracket (101) has a first groove (7) and the magnet (2) is embedded in the first groove (7). The distance between the two sides of the first groove (7) and the adjacent strip groove (302) is the same.

7. A low-iron-loss, flat, ultra-thin disc motor rotor according to claim 6, characterized in that: The side of the support block (8) is provided with a second groove (9), and the inner wall of the first groove (7) is in contact with the bottom of the second groove (9).

8. A low-iron-loss, flat, ultra-thin disc motor rotor according to claim 1, characterized in that: The strip groove (302) is provided with an insertion hole (11) at the end near the center of the first bracket (101). One end of the spacer (301) is inserted into the insertion hole (11). A sliding groove (17) is provided on the side wall of the strip groove (302). The edge of the spacer (301) is slidably installed in the sliding groove (17).

9. A low-iron-loss, flat, ultra-thin disc motor rotor according to claim 1, characterized in that: The spacer (301) has a first heat-conducting hole (12) in its axial direction, and a second heat-conducting hole (13) is provided on the side of the spacer (301) away from the second bracket (102). The first heat-conducting hole (12) and the second heat-conducting hole (13) are connected. The side of the circumference (103) has a heat dissipation hole (14) that is connected to the first heat-conducting hole (12).

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