An assembling method for a disc-type motor rotor and the disc-type motor rotor

Abstract

The present invention discloses an assembling method for a disc motor rotor and a disc motor rotor. The disc motor rotor includes a sector-shaped permanent magnet, an annular iron core, a retaining ring and a rotor disc. The rotor disc includes a pressing block, a connecting rod and a rotor bracket, and the pressing block, the connecting rod and the rotor bracket are integrally formed. The pressing block, the sector-shaped permanent magnet, the annular iron core and the rotor bracket are arranged in sequence from top to bottom, and the sector-shaped permanent magnet and the annular iron core are respectively connected to the pressing block and the rotor bracket by hot pressing. For the disc motor rotor disclosed in this solution, the rotor disc is of an integral structure, and the sector-shaped permanent magnet and the annular iron core are connected to the rotor bracket and the pressing block by hot pressing. Since the rotor disc is of an integral structure, it can ensure that the sector-shaped permanent magnet and the annular iron core will not loosen or fall off under the action of axial suction force, and ensure the performance of the disc motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an assembling method of a disc motor rotor and a disc motor rotor. Background Art

[0002] Radial magnetic field motors and axial magnetic field motors (also called disc motors) are two major branches in the field of motors. Disc motors are increasingly widely used due to their higher core utilization, greater power density, and higher torque density.

[0003] In the prior art, the annular core is tightly attached to the rotor bracket, the sector magnet is directly bonded to the annular core, and the sector magnet is further limited by pressing the sector magnet with a light composite material plate, which is also bonded to the rotor bracket with glue. Due to the structural characteristics of the disc motor, the rotor bracket must withstand a large axial magnetic attraction. The annular core and the sector magnet are often under the working condition of axial magnetic attraction, and are prone to loosening and falling off, thereby affecting the performance of the disc motor.

[0004] Therefore, how to prevent the rotor of the disc motor from loosening and falling off to ensure the performance of the disc motor has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, the present invention provides a disc motor rotor to prevent the rotor of the disc motor from loosening and falling off, so as to ensure the performance of the disc motor.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A disc-type motor rotor comprises a sector-shaped magnetic steel, an annular iron core, a hoop and a rotor disc.

[0008] The rotor disk is an integrally formed rotor disk, comprising a pressing block, a connecting rod and a rotor bracket arranged in sequence from top to bottom, wherein the pressing blocks are evenly distributed along the circumference of the rotor bracket, and the pressing blocks are connected to the rotor bracket through the connecting rod.

[0009] There are multiple sector-shaped magnetic steels, and the multiple sector-shaped magnetic steels are located on the front side of the annular core and are evenly distributed along the circumference of the annular core. The sector-shaped magnetic steels are located between two adjacent pressing blocks and are hot-pressed with the pressing blocks.

[0010] The annular core is provided with a mounting hole matched with the connecting rod, the back side of the annular core is hot-pressedly connected with the front side of the rotor bracket, and the diameter of the annular core is smaller than the diameter of the rotor bracket.

[0011] The hoop is sleeved on the annular iron core. The height of the hoop along its own axis direction is greater than the thickness of the annular iron core and at most equal to the sum of the thickness of the annular iron core and the thickness of the sector-shaped permanent magnet. The hoop is used for radially limiting the sector-shaped permanent magnet.

[0012] Preferably, in the above-mentioned disc-type motor rotor, a shaft hole is provided on the annular iron core. A first annular boss and a second annular boss coaxial with the shaft hole are respectively provided on the front and back surfaces of the annular iron core. The outer wall of the first annular boss can abut against the inner arc of the sector-shaped permanent magnet.

[0013] The rotor bracket is an annular rotor bracket, and the annular rotor bracket is sleeved on the second annular boss.

[0014] Preferably, in the above-mentioned disc-type motor rotor, the rotor bracket is a resin bracket, and the pressing block is a resin pressing block.

[0015] Preferably, in the above-mentioned disc-type motor rotor, the front surface of the annular iron core is a plane for mounting the sector-shaped permanent magnet. The back surface of the annular iron core is provided with a magnetic conduction boss and a first groove. The mounting hole is provided on the magnetic conduction boss. The magnetic conduction boss and the first groove are circumferentially spaced along the annular iron core.

[0016] The front surface of the rotor bracket is provided with a second groove matching with the magnetic conduction boss and a boss matching with the first groove. The mounting hole is provided at the bottom of the second groove.

[0017] Preferably, in the above-mentioned disc-type motor rotor, the magnetic conduction boss is a rectangular boss. The magnetic conduction boss is arranged along the radial direction of the annular iron core. The first groove is formed between adjacent magnetic conduction bosses. The first groove is a triangular groove. The second groove is a rectangular groove. The boss is a triangular boss.

[0018] Preferably, in the above-mentioned disc-type motor rotor, heat dissipation holes are provided on the annular iron core.

[0019] Preferably, in the above-mentioned disc-type motor rotor, the width of the hoop along its own radial direction is at most equal to the radius difference between the annular iron core and the rotor bracket.

[0020] Preferably, in the above-mentioned disc-type motor rotor, the hoop is a carbon fiber hoop.

[0021] Preferably, in the above-mentioned disc-type motor rotor, the pressing block is a triangular prism-shaped pressing block. The shape of the pressing block is the same as the shape of the first groove. Pressing plates capable of pressing the edges of the sector-shaped permanent magnet are arranged on both sides of the upper end of the pressing block.

[0022] An assembly method for a disc-type motor rotor, which is applicable to the assembly of the disc-type motor rotor described in any of the above-mentioned solutions, includes the following steps:

[0023] 1) Place the sector-shaped permanent magnets circumferentially on the front of the annular iron core along the circumference of the annular iron core;

[0024] 2) Put the material for making the rotor bracket into the first mold for hot pressing the rotor bracket, put the material for making the pressing block into the second mold for hot pressing the pressing block, and then place the whole composed of the annular iron core and the sector-shaped permanent magnets between the first mold and the second mold. Part of the material enters the mounting holes of the annular iron core, and hot press to make the rotor bracket, the pressing block and the connecting rod, and at the same time realize the hot press connection between the rotor bracket and the annular iron core, and between the pressing block and the sector-shaped permanent magnets.

[0025] It can be seen from the above technical solutions that the disc-type motor rotor provided by the present invention includes a sector-shaped permanent magnet, an annular iron core, a hoop and a rotor disc. The rotor disc includes a pressing block, a connecting rod and a rotor bracket, and the pressing block, the connecting rod and the rotor bracket are integrally formed. The pressing block, the sector-shaped permanent magnet, the annular iron core and the rotor bracket are arranged in sequence from top to bottom, and the sector-shaped permanent magnet and the annular iron core are respectively hot press-connected to the pressing block and the rotor bracket. For the disc-type motor rotor disclosed in this solution, the rotor disc is of an integral structure, and the sector-shaped permanent magnet and the annular iron core are hot press-connected to the rotor bracket and the pressing block. Since the rotor disc is of an integral structure, it can ensure that the sector-shaped permanent magnet and the annular iron core will not loosen or fall off under the action of the axial suction force, and ensure the performance of the disc-type motor.

[0026] This solution also discloses an assembly method for a disc-type motor rotor, which is applicable to the assembly of the disc-type electronic rotor described in any of the above-mentioned solutions. Since the disc-type motor rotor has the above technical effects, the disc-type motor rotor assembled by this method also has the same technical effects, which will not be elaborated here. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention 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 invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is an exploded view of the disc-type motor rotor provided by the embodiment of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the rotor disc provided by the embodiment of the present invention;

[0030] Figure 3 It is a front structural schematic diagram of the annular iron core provided by the embodiment of the present invention;

[0031] Figure 4 Schematic diagram of the back structure of the toroidal iron core provided by an embodiment of the present invention;

[0032] Figure 5 Schematic diagram of the structure of the rotor bracket and the pressing block in cooperation provided by an embodiment of the present invention;

[0033] Figure 6 Schematic diagram of the structure of the pressing block provided by an embodiment of the present invention.

[0034] Among them,

[0035] 1. Sector magnet, 2. Ring hoop, 3. Rotor disk, 31. Pressing block, 32. Rotor bracket, 321. Second groove, 322. Boss, 4. Toroidal iron core, 41. Magnetic conduction boss, 42. First groove, 43. Heat dissipation hole. Detailed implementation manners

[0036] The present invention discloses a disc motor rotor to prevent the rotor of the disc motor from loosening and falling off, so as to ensure the performance of the disc motor.

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to Figures 1-6 .

[0039] The present invention discloses a disc motor rotor, including a sector magnet 1, a toroidal iron core 4, a ring hoop 2 and a rotor disk 3.

[0040] The rotor disk 3 is an integrally formed rotor disk 3. The rotor disk 3 includes a pressing block 31, a connecting rod and a rotor bracket 32 arranged in sequence from top to bottom. The rotor disk 3 disclosed in this solution is an integrally formed structure, and the connection is firm and reliable itself.

[0041] The disc motor rotor disclosed in this solution includes a pressing block 31, a sector magnet 1, a toroidal iron core 4 and a rotor bracket 32 in sequence from top to bottom.

[0042] The toroidal iron core 4 is a circular toroidal iron core. The sector magnet 1 is located on the front of the toroidal iron core 4. The number of the sector magnets 1 is multiple, and the multiple sector magnets 1 are evenly arranged along the circumferential direction of the toroidal iron core 4. As Figure 1As shown, the radial direction of the sector-shaped permanent magnet 1 is the same as the radial direction of the corresponding position of the annular iron core 4. It should be noted here that the front side of the annular iron core 4 is the side away from the rotor bracket 32.

[0043] As Figure 1 and 2 shown, the outer arc edge of the sector-shaped permanent magnet 1 is flush with the outer ring of the annular iron core 4.

[0044] After multiple sector-shaped permanent magnets 1 are fitted with the front side of the annular iron core 4, the rotor disc 3 is connected to the whole formed by the sector-shaped permanent magnets 1 and the annular iron core 4.

[0045] In this solution, the rotor bracket 32 and the pressure block 31 are respectively connected to the back side of the annular iron core 4 and the front side of the pressure block 31 by hot pressing. Specifically, the material for making the rotor bracket 32 is placed in the first mold for making the rotor bracket 32, the material for making the pressure block 31 is placed in the second mold for making the pressure block 31, then the whole formed by the annular iron core 4 and the sector-shaped permanent magnets 1 is placed between the first mold and the second mold, and finally hot pressing is carried out. During the hot pressing process, not only the hot pressing production of the rotor bracket 32 is realized, but also the hot pressing production of the pressure block 31 is realized. More importantly, the connection between the rotor bracket 32 and the annular iron core 4, and the connection between the pressure block 31 and the sector-shaped permanent magnets 1 are realized. At the same time, the connecting rod is also hot-pressed and formed in the mounting hole of the annular iron core 4 and is connected to the rotor bracket 32 and the pressure block 31.

[0046] The rotor bracket 32, the connecting rod and the pressure block 31 form an integral structure, that is, the connection is completed during the manufacturing process.

[0047] At least two connecting rods are arranged on each pressure block 31. The connecting rods not only play a role in connecting the rotor bracket 32 and the pressure block 31, but also play a role in circumferential and axial limiting of the annular iron core 4, preventing relative movement in the circumferential direction and the radial direction between the annular iron core 4 and the rotor bracket 32.

[0048] After the rotor disc 3 is manufactured, the pressure blocks 4 are evenly distributed along the circumference of the rotor bracket 32, and there is a sector-shaped permanent magnet 1 between two adjacent pressure blocks. The function of the pressure block 4 is to press the sector-shaped permanent magnet 1 tightly on the annular iron core 4.

[0049] In this solution, the annular iron core 4 and the rotor bracket 32 are coaxially arranged. The diameter of the rotor bracket 32 is larger than the diameter of the annular iron core 4. After the connection between the rotor bracket 32 and the annular iron core 4 is completed, the rotor bracket 32 wraps the outer circumference of the annular iron core 4 and the wrapping height is at least half of the thickness of the annular iron core 4. The rotor bracket 32 forms an L-shaped surface on the outer circumference of the annular iron core 4.

[0050] The hoop 2 is sleeved on the L-shaped surface, and the hoop 2 is used for radially limiting the sector magnet 1. In a specific embodiment of this solution, the height of the hoop 2 along its own axis is greater than the thickness of the annular iron core 4 and at most equal to the sum of the thicknesses of the annular iron core 4 and the sector magnet 1, ensuring the effective pressing of the hoop 2 on the sector magnet 1.

[0051] Preferably, the height of the hoop 2 along its own axis is equal to the sum of the thicknesses of the annular iron core 4 and the sector magnet 1.

[0052] The fixation of the sector magnet 1 on the annular iron core 4 is achieved through the cooperation of the hoop 2 and the pressing block 4. The hoop 2 can play a role in radially limiting the sector magnet 1 to prevent the sector magnet 1 from sliding out along the radial direction of the annular iron core 4, and the pressing block 31 realizes the pressing of the sector magnet 1 in the axial direction and the circumferential direction limiting along the annular iron core 4.

[0053] The disclosed disc motor rotor of this solution includes a sector magnet 1, an annular iron core 4, a hoop 2, and a rotor disc 3. The rotor disc 3 includes a pressing block 31, a connecting rod, and a rotor bracket 32, and the pressing block 31, the connecting rod, and the rotor bracket 32 are integrally formed. The pressing block 31, the sector magnet 1, the annular iron core 4, and the rotor bracket 32 are arranged in sequence from top to bottom, and the sector magnet 1 and the annular iron core 4 are respectively thermally pressed and connected to the pressing block 31 and the rotor bracket 32. In the disclosed disc motor rotor of this solution, the rotor disc 3 is an integral structure, and the sector magnet 1 and the annular iron core 4 are thermally pressed and connected to the rotor bracket 32 and the pressing block 31. Since the rotor disc 3 is an integral structure, it can ensure that the sector magnet 1 and the annular iron core 4 will not loosen and fall off under the action of the axial suction force, ensuring the performance of the disc motor.

[0054] In this solution, the connection between the sector magnet 1 and the annular iron core 4 is realized during the hot pressing process of the rotor bracket 32 and the pressing block 31, and the annular iron core 4 can serve as a hot pressing die for the connecting rod. The rotor bracket 32 and the pressing block 31 are simultaneously connected to the sector magnet 1 and the annular iron core 4 during the hot pressing process. Compared with the existing glue connection method, the connection strength is high and the connection is reliable.

[0055] In this solution, a shaft hole is provided on the annular iron core 4, and a first annular boss and a second annular boss coaxial with the shaft hole are respectively provided on the front and back surfaces of the annular iron core 4. The outer wall of the first annular boss can abut against the inner arc of the sector magnet 1.

[0056] The rotor bracket 32 is an annular rotor bracket. The width of the annular rotor bracket along its own radial direction is at least equal to the sum of the width of the sector magnet 1 and the thickness of the hoop 2. The inner circle of the annular rotor bracket is flush with the inner arc of the sector magnet 1, and the annular rotor bracket is sleeved on the second annular boss.

[0057] Such as Figure 3 And4 As shown, the inner circles of the first annular boss and the second annular boss are both the hole walls of the shaft hole.

[0058] It should be noted here that the first annular boss plays a circumferential and axial limiting role for the rotor bracket 32; when the sector magnet 1 is installed on the front of the annular iron core 4, the inner arc edge of the sector magnet 1 abuts against the second annular boss. After the hoop 2 is sleeved on the annular iron core, the outer arc edge of the sector magnet 1 abuts against the inner circle of the hoop, that is, the second annular boss and the hoop cooperate to fix the sector magnet 1 on the annular iron core 4 in the radial direction.

[0059] In this solution, the shaft hole of the disc motor rotor is arranged on the annular iron core 4, the rotor bracket 32 is installed on the annular iron core 4, and the sector magnet 1 is also installed on the annular iron core 4. The annular iron core 4 rotates with the rotating shaft, driving the rotor bracket 32 and the sector magnet 1 to rotate.

[0060] In a specific embodiment of this solution, the rotor bracket 32 is a resin bracket, and the pressing block 31 is a resin pressing block.

[0061] The rotor bracket 32 and the pressing block 31 are not limited to resin materials and can also be other high-strength composite materials.

[0062] Such as Figure 3 As shown, the front of the annular iron core 4 is a plane for installing the sector magnet 1; as Figure 4 As shown, the back of the annular iron core 4 is provided with magnetic conduction bosses 41 and first grooves 42, and the magnetic conduction bosses 41 and the first grooves 42 are distributed at intervals along the circumference of the annular iron core 4.

[0063] The shape of the back of the annular iron core 4 determines the front structure of the rotor bracket 32. The first mold is used to form the back of the rotor bracket 32. The annular iron core 4 cooperates with the first mold to form the front of the rotor bracket 32, and the front structure of the rotor bracket 32 is the same as the back structure of the annular iron core 4. In this solution, the back of the annular iron core 4 is provided with magnetic conduction bosses 41 and first grooves 42 arranged at intervals. Correspondingly, the front of the rotor bracket 32 is provided with second grooves 321 that cooperate with the magnetic conduction bosses 41, and bosses 322 that cooperate with the first grooves 42.

[0064] When the annular iron core 4 cooperates with the rotor bracket 32, the magnetic conduction bosses 41 of the annular iron core 4 are inserted into the second grooves 321 of the rotor bracket 32, and the bosses of the rotor bracket 32 are embedded in the first grooves 42 of the annular iron core 4. The annular iron core 4 and the rotor bracket 32 realize the circumferential and axial limiting of the annular iron core 4 by the cooperation of grooves and bosses, and at the same time increase the contact area between the annular iron core 4 and the rotor bracket 32, further enhancing the bonding degree of the annular iron core 4 and the rotor bracket 32 through hot pressing connection, and further preventing the annular iron core 4 from falling off the rotor bracket 32.

[0065] The thickness of the magnetic conduction boss 41 is half of the overall thickness of the toroidal iron core 4, that is, half of the thickness of the toroidal iron core 4 is embedded in the rotor bracket 32.

[0066] In a specific embodiment of this solution, the magnetic conduction boss 41 is a rectangular boss. The magnetic conduction boss 41 is arranged along the radial direction of the toroidal iron core 4. The length of the magnetic conduction boss 41 is equal to the width of the rotor bracket 32 along its own radial direction, that is, one end of the magnetic conduction boss 41 abuts against the first annular boss, and the other end of the magnetic conduction boss 41 is flush with the outer circumference of the toroidal iron core 4. A triangular first groove 42 is formed between two adjacent magnetic conduction bosses 41.

[0067] As Figure 4 shown, mounting holes are provided on the magnetic conduction boss 41. As Figure 5 shown, the bottom of the second groove 321 is connected to the connecting rod.

[0068] Correspondingly, the second groove 321 on the front surface of the rotor bracket 32 is a rectangular groove. The inner side of the rectangular groove communicates with the inner ring of the rotor bracket 32, that is, the rectangular groove has only three side walls, and the boss 322 is a triangular boss.

[0069] The shapes of the magnetic conduction boss 41, the first groove 42, the second groove 321 and the boss 322 are not limited to the above embodiments, and can also be other shapes, which are not specifically limited here.

[0070] The width of the hoop 2 along its own radial direction is at most equal to the radius difference between the toroidal iron core 4 and the rotor bracket 32, ensuring that after the hoop 2 is sleeved on the sector magnet 1, the outer circumference of the hoop 2 will not protrude beyond the outer circumference of the rotor bracket 32.

[0071] As Figure 3 and 4 shown, heat dissipation holes 43 are provided on the toroidal iron core 4. The heat dissipation holes 43 are opened along the axial direction of the iron core and penetrate through the toroidal iron core 4. The heat dissipation holes 43 are opened on the first annular boss of the toroidal iron core 4.

[0072] After the sector magnet 1 is fitted with the front surface of the toroidal iron core 4, the shape of the space of the toroidal iron core 4 located between two adjacent sector magnets 1 determines the shape of the pressing block 31. The second mold is used to form the front surface of the pressing block 31. The shape of the back surface of the pressing block 31 is the same as the shape of the space of the toroidal iron core 4 located between two adjacent sector magnets 1. In this solution, the shape between two adjacent sector magnets 1 is a triangular prism shape. In a specific embodiment of this solution, the pressing block 31 is a triangular prism-shaped pressing block. Pressing plates are provided at the upper ends of the two sides of the pressing block 31 that can contact the sector magnet 1. The pressing plates can press the front surface of the sector magnet 1, and the lower ends of the pressing plates can extend into the space between two adjacent sector magnets 1.

[0073] In this solution, the sector-shaped permanent magnet 1 and the annular iron core 2 not only play their own roles, but also can act as molds during the hot pressing process of the rotor disc 3.

[0074] Preferably, the pressing block 31 and the pressing plate are integrally formed during the hot pressing process. As Figure 6 shown, the connection position between the pressing plate and the pressing block 31 is an inclined surface.

[0075] In a specific embodiment of this solution, the hoop 2 is a carbon fiber hoop. In this solution, the hoop 2 is formed by carbon fiber winding.

[0076] This solution also discloses an assembly method for a disc motor rotor, which is applicable to the assembly of the disc motor rotor described in any of the above solutions. Since the disc motor rotor has the above technical effects, the disc motor rotor assembled by this method also has the same technical effects, which will not be elaborated here.

[0077] The specific steps are as follows:

[0078] 1) Place the sector-shaped permanent magnet along the circumferential direction of the annular iron core on the front surface of the annular iron core;

[0079] 2) Put the material for making the rotor bracket 32 into the first mold for hot pressing the rotor bracket 32, put the material for making the pressing block 31 into the second mold for hot pressing the pressing block 31, and then place the whole formed by the annular iron core 4 and the sector-shaped permanent magnet 1 between the first mold and the second mold. Part of the material enters the mounting hole of the annular iron core 4, and hot press to make the rotor bracket 32, the pressing block 31 and the connecting rod, and at the same time realize the hot pressing connection between the rotor bracket 32 and the annular iron core 4, and between the pressing block 31 and the sector-shaped permanent magnet 1.

[0080] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A disc-type motor rotor, characterized in that, It includes a sector-shaped permanent magnet (1), an annular iron core (4), a hoop (2) and a rotor disc (3). The rotor disc (3) is an integrally formed rotor disc (3), which includes a pressing block (31), a connecting rod and a rotor bracket (32) arranged in sequence from top to bottom. The pressing blocks (31) are evenly distributed along the circumference of the rotor bracket (32), and the pressing blocks (31) are connected to the rotor bracket (32) through the connecting rods. The number of the sector-shaped permanent magnets (1) is multiple. The multiple sector-shaped permanent magnets (1) are located on the front of the annular iron core (4) and are evenly distributed along the circumference of the annular iron core (4). The sector-shaped permanent magnets (1) are located between two adjacent pressing blocks (31) and are thermally pressed and connected to the pressing blocks (31). The annular iron core (4) is provided with mounting holes that cooperate with the connecting rods. The back of the annular iron core (4) is thermally pressed and connected to the front of the rotor bracket (32). The diameter of the annular iron core (4) is smaller than the diameter of the rotor bracket (32). The hoop (2) is sleeved on the annular iron core (4). The height of the hoop (2) along its own axis direction is greater than the thickness of the annular iron core (4) and at most equal to the sum of the thickness of the annular iron core (4) and the thickness of the sector-shaped permanent magnet (1). The hoop (2) is used for radially limiting the sector-shaped permanent magnet (1).

2. The disc-type motor rotor according to claim 1, wherein The annular iron core (4) is provided with a shaft hole. A first annular boss and a second annular boss coaxial with the shaft hole are respectively arranged on the front and back of the annular iron core (4). The outer wall of the first annular boss can abut against the inner arc of the sector-shaped permanent magnet (1). The rotor bracket (32) is an annular rotor bracket, and the annular rotor bracket is sleeved on the second annular boss.

3. The disc-type motor rotor according to claim 2, characterized in that, The rotor bracket (32) is a resin bracket, and the pressing block (31) is a resin pressing block.

4. The disc-type motor rotor according to claim 3, characterized in that, The front of the annular iron core (4) is a plane for mounting the sector-shaped permanent magnet (1). The back of the annular iron core (4) is provided with a magnetic conduction boss (41) and a first groove (42). The mounting hole is arranged on the magnetic conduction boss (41). The magnetic conduction boss (41) and the first groove (42) are circumferentially spaced apart along the annular iron core (4). The front of the rotor bracket (32) is provided with a second groove (321) that cooperates with the magnetic conduction boss (41), and a boss (322) that cooperates with the first groove (42). The mounting hole is arranged at the bottom of the second groove (321).

5. The disc-type motor rotor according to claim 4, characterized in that, The magnetic conduction boss (41) is a rectangular boss. The magnetic conduction boss (41) is arranged along the radial direction of the annular iron core (4). The first groove (42) is formed between adjacent magnetic conduction bosses (41). The first groove (42) is a triangular groove. The second groove (321) is a rectangular groove, and the boss is a triangular boss.

6. The disc-type motor rotor according to claim 2, wherein The annular iron core (4) is provided with heat dissipation holes (43).

7. The disk-type motor rotor according to claim 1, characterized in that, The width of the hoop (2) along its own radial direction is at most equal to the radius difference between the annular iron core (4) and the rotor bracket (32).

8. The disc-type motor rotor according to claim 1, characterized in that, The hoop (2) is a carbon fiber hoop.

9. The disc-type motor rotor according to claim 5, characterized in that, The briquette (31) is a triangular prism-shaped briquette, and the shape of the briquette (31) is the same as that of the first groove (42). Press plates capable of pressing the edges of the sector-shaped permanent magnet (1) are arranged on both sides of the upper end of the briquette (31).

10. A method for assembling a disc-type motor rotor, characterized in that It is applicable to the assembly of the disc-type motor rotor according to any one of claims 1-9, and comprises the following steps: 1) Place the sector-shaped permanent magnet (1) on the front of the annular iron core (4) along the circumferential direction of the annular iron core (4); 2) Place the material for manufacturing the rotor bracket (32) into the first mold for hot-pressing the rotor bracket (32), place the material for manufacturing the briquette (31) into the second mold for hot-pressing the briquette (31), then place the whole formed by the annular iron core (4) and the sector-shaped permanent magnet (1) between the first mold and the second mold. Part of the material enters the mounting hole of the annular iron core (4), and hot-press the rotor bracket (32), the briquette (31) and the connecting rod, and simultaneously realize the hot-pressing connection between the rotor bracket (32) and the annular iron core (4), and between the briquette (31) and the sector-shaped permanent magnet (1).

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