Disc type motor rotor and disc type motor

Abstract

The utility model relates to the technical field of motors, and discloses a disc type motor rotor and a disc type motor. The disc type motor comprises a stator and a disc type motor rotor, the disc type motor rotor comprises a back plate, a plurality of magnetic conductive blocks and a plurality of permanent magnet assemblies, the back plate is made of non-magnetic conductive materials, the magnetic conductive blocks are installed on the same side of the back plate and distributed at intervals in the circumferential direction, limiting grooves are formed between the adjacent magnetic conductive blocks, and the permanent magnet assemblies are magnetized in the tangential direction. Each permanent magnet assembly is inserted into the corresponding limiting groove in the radial direction, and the groove walls of the limiting grooves abut against the corresponding permanent magnet assemblies to the back plate in the axial direction.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a disc motor rotor and a disc motor. Background Art

[0002] Disc motors have the advantages of compact structure, high power density and torque density, high acceleration and response speed, and are widely used in automobiles, industrial automation and other fields.

[0003] The disc motor includes a stator and a rotor. The stator includes a stator core and a stator winding. The stator winding can generate axial magnetic lines of force after being energized. The rotor includes a magnetizer and a permanent magnet. The magnetizer and the permanent magnet are alternately arranged along the circumferential direction. In some existing schemes, the permanent magnet is tangentially magnetized to cooperate with the axial magnetic lines of force, so that the disc motor has both permanent magnet torque and magnetic resistance torque. Therefore, when the maximum torque of the disc motor is the same, the amount of permanent magnet can be saved, which can not only reduce the cost of the disc motor, but also improve the high-speed performance of the disc motor.

[0004] Since the permanent magnets of the rotor are magnetized tangentially and are arranged in close proximity to the magnetizers, it is necessary to ensure that no two adjacent magnetizers are connected by magnetic conductive materials, otherwise the magnetic circuits of the adjacent permanent magnets will be short-circuited, thereby causing the performance of the motor to deteriorate. Therefore, in the prior art, connection structures are usually provided one by one for each permanent magnet and magnetizer, resulting in a complex disc motor rotor structure and inconvenient assembly. Utility Model Content

[0005] One purpose of the utility model is to provide a disc motor rotor, in which the limiting groove formed by the magnetic conductive block constrains the permanent magnet assembly in the axial direction, and there is no need to set up an additional axial constraint structure of the permanent magnet assembly, thereby simplifying the overall connection structure of the disc motor rotor and improving the assembly efficiency.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Disc motor rotor, comprising:

[0008] A back plate, made of non-magnetic conductive material;

[0009] A plurality of magnetic conductive blocks are installed on the same side of the back plate, the plurality of magnetic conductive blocks are arranged at intervals along the circumferential direction, and limiting grooves are formed between adjacent magnetic conductive blocks;

[0010] A plurality of permanent magnet components are tangentially magnetized, each of the permanent magnet components is radially inserted into one of the limiting grooves, and the groove wall of the limiting groove presses the corresponding permanent magnet component against the back plate along the axial direction.

[0011] As an alternative solution, two opposite sides of the magnetic conduction block in the circumferential direction are provided with a first side wall and a second side wall, and the first side wall, the second side wall of the adjacent magnetic conduction block and the back plate enclose to form the limiting groove, where:

[0012] At least one of the relatively arranged first side wall and the second side wall is an inclined surface, so that the magnetic conduction block axially presses the corresponding permanent magnet assembly against the back plate; or

[0013] At least one of the relatively arranged first side wall and the second side wall is in concave-convex fit with the corresponding permanent magnet assembly.

[0014] As an alternative solution, the magnetic conduction block is fixed to the back plate by bonding or by means of fasteners.

[0015] As an alternative solution, a first dovetail groove and a second dovetail groove are respectively arranged on one side of the magnetic conduction block and the back plate facing each other;

[0016] The disc-type motor rotor further includes a plug-in member, and two ends of the plug-in member in the axial direction are respectively plugged into the first dovetail groove and the second dovetail groove.

[0017] As an alternative solution, it further includes a pressing plate made of non-magnetic material, the pressing plate is connected to the back plate, and the inner circumferential surface of the magnetic conduction block and the inner circumferential surface of the permanent magnet assembly are both abutted against the pressing plate.

[0018] As an alternative solution, the pressing plate is annular, and the outer circumferential surface of the pressing plate includes a plurality of abutting surfaces and a plurality of first pressing inclined surfaces, and the abutting surfaces and the first pressing inclined surfaces are arranged alternately;

[0019] The inner circumferential surface of the permanent magnet assembly abuts against the abutting surface, and the inner circumferential surface of the magnetic conduction block is configured as a second pressing inclined surface, and the first pressing inclined surface abuts against the second pressing inclined surface, so that the pressing plate axially presses the magnetic conduction block against the back plate.

[0020] As an alternative solution, the pressing plate is bonded or connected to the back plate by means of fasteners.

[0021] As an alternative solution, the disc-type motor rotor further includes a retaining ring made of non-magnetic material, the retaining ring surrounds the outer circumference of the back plate, and the outer circumferential surface of the magnetic conduction block and the outer circumferential surface of the permanent magnet assembly both abut against the retaining ring.

[0022] Another object of the present invention is to provide a disc-type motor. By adopting the above-mentioned disc-type motor rotor, the structure is simple and the assembly is convenient.

[0023] To achieve this purpose, the present utility model adopts the following technical solutions:

[0024] A disc motor, comprising a stator and the disc motor rotor as described above, wherein the stator and the disc motor rotor are arranged circumferentially.

[0025] As an alternative solution, the pole-slot combination of the stator is 9N slots and 2N poles, where N is a positive integer.

[0026] The beneficial effects of the present utility model are as follows:

[0027] For the disc motor rotor of the present utility model, the back plate is made of non-magnetic conductive material. A plurality of magnetic conductive blocks are installed on the same side of the back plate, and the plurality of magnetic conductive blocks are arranged at intervals along the axial direction to form a plurality of limiting slots. After the permanent magnet assembly is inserted into the corresponding limiting slots, the slot walls of the limiting slots cooperate with the permanent magnets and press the permanent magnets against the back plate along the axial direction. That is, the magnetic conductive blocks themselves constitute the axial constraint structure of the permanent magnet assembly, which can simplify the overall connection structure of the disc motor rotor, with high assembly efficiency. Moreover, since the back plate is made of non-magnetic conductive material, the problem of magnetic circuit short circuit between adjacent permanent magnet assemblies can be avoided. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of the disc motor provided by the specific embodiment of the present utility model;

[0029] Figure 2 is a front view of the disc motor rotor provided by the specific embodiment of the present utility model;

[0030] Figure 3 is an exploded view of the disc motor rotor provided by the specific embodiment of the present utility model from one perspective;

[0031] Figure 4 is an exploded view of the disc motor rotor provided by the specific embodiment of the present utility model from another perspective.

[0032] In the figure:

[0033] 10. Disc motor rotor; 11. Back plate; 110. Limiting slot; 117. Second dovetail slot; 118. Central hole; 12. Magnetic conductive block; 125. First dovetail slot; 126. First side wall; 127. Second side wall; 128. Second pressing inclined surface; 13. Permanent magnet assembly; 14. Retaining ring; 15. Pressure plate; 151. Contact surface; 152. First pressing inclined surface; 18. Plug-in component;

[0034] 20. Stator;

[0035] 30. Output shaft. Specific Embodiments

[0036] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0037] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and over", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] This embodiment provides a disc motor rotor and a disc motor. As Figure 1 shown, the disc motor includes a disc motor rotor 10, a stator 20, and an output shaft 30. The stator 20 and the disc motor rotor 10 are arranged axially (i.e., the X direction in the figure), and the output shaft 30 is connected to the rotor. When the motor works, after the stator 20 is energized, a magnetic field is generated, and the disc motor rotor 10 drives the output shaft 30 to rotate under the action of the magnetic field.

[0041] In this embodiment, the disc motor includes a stator 20 and two disc motor rotors 10. The two disc motor rotors 10 are respectively arranged on both sides of the stator 20. The output shaft 30 penetrates through the stator 20 and is respectively connected to the two disc motor rotors 10 at both ends. In some embodiments, the disc motor includes one disc motor rotor 10 and two stators 20. The two stators 20 are respectively arranged on both sides of the disc motor rotor 10. In other embodiments, the disc motor may also include only one disc motor rotor 10 and one stator 20.

[0042] As Figure 2 shown, the disc motor rotor 10 includes a plurality of magnetic conduction blocks 12 and a plurality of permanent magnet assemblies 13. The magnetic conduction blocks 12 and the permanent magnet assemblies 13 are arranged alternately in the circumferential direction. The permanent magnet assemblies 13 are magnetized tangentially, and the magnetic pole directions of adjacent permanent magnet assemblies 13 are opposite. Therefore, in cooperation with the magnetic force lines in the axial direction of the stator 20, the disc motor has both a permanent magnet torque and a reluctance torque. When the maximum torque of the disc motor is the same, the amount of permanent magnet used can be saved, which can not only reduce the cost of the disc motor, but also improve the high-speed performance of the disc motor.

[0043] Preferably, the pole-slot combination of the stator 20 is 9N slots and 2N poles, where N is a positive integer. By setting the stator 20 to the above-mentioned pole-slot combination, the disc motor can have a higher reluctance torque, thereby further reducing the manufacturing cost of the disc motor and improving the high-speed performance of the disc motor. Optionally, N can be 1, 2, 3, or 4, and the corresponding pole-slot combinations are 9 slots and 2 poles, 18 slots and 4 poles, 27 slots and 6 poles, 36 slots and 8 poles. Of course, the value of N can also be 5 or larger, which is not specifically limited here. It should be noted that the stator 20 can obtain the above-mentioned pole-slot combination by selecting an appropriate winding method, and the corresponding winding method is the prior art and will not be elaborated here.

[0044] Since the permanent magnet assemblies 13 are magnetized tangentially and the permanent magnet assemblies 13 are arranged closely to the magnetic conduction blocks 12, it is necessary to ensure that the adjacent two magnetic conduction blocks 12 are not connected by a magnetic conduction material, otherwise the magnetic circuits of adjacent permanent magnets will be short-circuited. In the prior art, connection structures are usually set for each permanent magnet and magnetic conductor one by one, resulting in a complex structure of the disc motor rotor 10 and inconvenient assembly.

[0045] In response to this, as Figures 2 - 4As shown in the figure, the disc motor rotor 10 further includes a back plate 11 made of non-magnetic material. A plurality of magnetic conduction blocks 12 are installed on the same side of the back plate 11. The plurality of magnetic conduction blocks 12 are arranged at intervals in the circumferential direction, and a limiting groove 110 is formed between adjacent magnetic conduction blocks 12. Each permanent magnet assembly 13 is inserted into a limiting groove 110 in the radial direction, and the groove wall of the limiting groove 110 presses the corresponding permanent magnet against the back plate 11 in the axial direction. In the disc motor rotor 10 of this embodiment, the magnetic conduction blocks 12 themselves constitute the axial constraint structure of the permanent magnet assembly 13, which can simplify the overall connection structure of the disc motor rotor 10, and has high assembly efficiency. Moreover, since the back plate 11 is made of non-magnetic material, the problem of magnetic circuit short circuit between adjacent permanent magnet assemblies 13 can be avoided. By adopting the above disc motor rotor 10, the disc motor of this embodiment has a simple structure and is convenient to assemble.

[0046] In this embodiment, the back plate 11 is preferably made of high-strength non-magnetic material to prevent the back plate 11 from deforming during the operation of the motor. Optionally, the back plate 11 can be made of materials such as titanium alloy, aluminum alloy, glass fiber, and carbon fiber. Optionally, the magnetic conduction blocks 12 can be made of materials with good magnetic conduction performance such as silicon steel sheets, SMC materials, steel, iron, and amorphous alloys. Optionally, in some embodiments, the permanent magnet assembly 13 includes a single permanent magnet. In some embodiments, the permanent magnet assembly 13 includes a plurality of permanent magnets and a plurality of magnetic conductors. The magnetic pole directions of the plurality of permanent magnets are the same, and the permanent magnets and the magnetic conductors are arranged alternately in the circumferential direction to form an integral permanent magnet assembly 13.

[0047] In some embodiments, the magnetic conduction blocks 12 can be fixed to the back plate 11 by means of bonding, fastener connection, etc.

[0048] In some embodiments, such as Figure 3 and Figure 4 As shown, first dovetail grooves 125 and second dovetail grooves 117 are respectively provided on the sides of the magnetic conduction blocks 12 and the back plate 11 facing each other. The disc motor rotor 10 further includes a plug-in member 18. The two ends of the plug-in member 18 in the axial direction are respectively inserted into the first dovetail groove 125 and the second dovetail groove 117. By cooperating with the first dovetail groove 125 and the second dovetail groove 117 respectively, the plug-in member 18 can axially limit the magnetic conduction blocks 12 to the back plate 11. It is not only convenient to assemble, but also ensures the installation position accuracy of each magnetic conduction block 12, and further can ensure the installation position accuracy of each permanent magnet assembly 13. It should be noted that the circumferential dimension of the notch end of the first dovetail groove 125 is smaller than the circumferential dimension of the bottom end of the groove. The circumferential dimension of the notch end of the second dovetail groove 117 is smaller than the circumferential dimension of the bottom end of the groove. In addition, a central hole 118 is also provided on the back plate 11, and this central hole 118 is used for installing the output shaft 30.

[0049] Such as Figure 3As shown, the magnetic conduction block 12 has a first side wall 126 and a second side wall 127 on both sides in the circumferential direction. The first side wall 126, the second side wall 127 of the adjacent magnetic conduction block 12 and the back plate 11 enclose a limiting groove 110. The cross-section of the permanent magnet assembly 13 has the same shape and size as that of the limiting groove 110. At least one of the relatively arranged first side wall 126 and second side wall 127 is an inclined surface. Therefore, along the axial direction and away from the back plate 11, the dimension of the limiting groove 110 in the circumferential direction gradually decreases, so that the first side wall 126 and / or the second side wall 127 can axially press the permanent magnet assembly 13 against the back plate 11.

[0050] In this embodiment, the first side wall 126 of the magnetic conduction block 12 is opposite to the second side wall 127 of the adjacent magnetic conduction block 12, and both are inclined surfaces. At this time, the cross-section of the limiting groove 110 is trapezoidal, and both ends of the permanent magnet assembly 13 in the circumferential direction are pressed by the first side wall 126 and the second side wall 127 respectively, ensuring that the permanent magnet assembly 13 is firmly installed and uniformly stressed. In other embodiments, only the first side wall 126 or the second side wall 127 that encloses the limiting groove 110 can be set as an inclined surface. At this time, the cross-section of the limiting groove 110 is a right trapezoid.

[0051] In other embodiments (not shown), the magnetic conduction block has a first side wall and a second side wall on both sides in the circumferential direction. The first side wall, the second side wall of the adjacent magnetic conduction block and the back plate enclose a limiting groove. The cross-section of the permanent magnet assembly has the same shape and size as that of the limiting groove. At least one of the relatively arranged first side wall and second side wall is in concave-convex fit with the corresponding permanent magnet assembly. This method can better axially limit the permanent magnet assembly, but will correspondingly increase the processing difficulty of the permanent magnet assembly and the magnetic conduction block.

[0052] To axially fix the magnetic conduction block 12 and the permanent magnet assembly 13, as Figures 2 - 4 shown, the disc motor rotor 10 further includes a pressing plate 15 and a retaining ring 14. The pressing plate 15 is made of non-magnetic conductive material and is connected to the back plate 11. The inner circumferential surface of the magnetic conduction block 12 and the inner circumferential surface of the permanent magnet assembly 13 are in contact with the pressing plate 15. The retaining ring 14 is also made of non-magnetic conductive material. The retaining ring 14 surrounds the outer periphery of the back plate 11. The outer circumferential surfaces of the magnetic conduction block 12 and the permanent magnet assembly 13 are both in contact with the retaining ring 14, so as to realize the limit on the outer ends of the magnetic conduction block 12 and the permanent magnet assembly 13 in the radial direction. That is to say, through the pressing plate 15 and the retaining ring 14, the radial limits on the magnetic conduction block 12 and the permanent magnet assembly 13 can be realized.

[0053] Optionally, the pressing plate 15 is bonded or connected to the back plate 11 by fasteners. The pressing plate 15 is made of materials such as titanium alloy, aluminum alloy, glass fiber, and carbon fiber. In this embodiment, the pressing plate 15 is generally annular, and the hole in the center of the pressing plate 15 is used to avoid the output shaft 30.

[0054] During the high-speed rotation of the disc motor, the inner ends of the magnetic conduction blocks 12 and the permanent magnet assemblies 13 along the radial direction are prone to warping problems.

[0055] In this regard, as Figure 3 and Figure 4 shown, the outer circumferential surface of the pressing plate 15 includes a plurality of abutting surfaces 151 and a plurality of first pressing inclined surfaces 152. The abutting surfaces 151 and the first pressing inclined surfaces 152 are alternately arranged. The inner circumferential surface of the permanent magnet assembly 13 abuts against the abutting surface 151. The inner circumferential surface of the magnetic conduction block 12 is configured as a second pressing inclined surface 128. The first pressing inclined surface 152 abuts against the second pressing inclined surface 128, so that the pressing plate 15 axially presses the magnetic conduction block 12 against the back plate 11. The first pressing inclined surface 152 on the pressing plate 15 presses against the second pressing inclined surface 128 of the magnetic conduction block 12, which can avoid the problem that the inner end of the magnetic conduction block 12 along the radial direction warps during the high-speed rotation of the motor. Since the first side wall 126 and the second side wall 127 of the magnetic conduction block 12 axially press the permanent magnet assembly 13, therefore, the inner ring of the permanent magnet assembly 13 along the radial direction is not prone to the above-mentioned warping problem either.

[0056] Optionally, the retaining ring 14 can be made of materials such as titanium alloy, aluminum alloy, glass fiber, carbon fiber, etc. Preferably, the retaining ring 14 provides a radial clamping force to the magnetic conduction block 12 and the permanent magnet assembly 13. Therefore, during the rotation of the motor, this radial clamping force can balance the centrifugal forces of the magnetic conduction block 12 and the permanent magnet assembly 13, avoid the magnetic conduction block 12 or the permanent magnet assembly 13 from being thrown out during the rotation process, ensure the stable positions of the permanent magnet assembly 13 and the magnetic conduction block 12, and further enable the disc motor rotor 10 to adapt to higher-speed rotation. In some embodiments, the radial clamping force provided by the retaining ring 14 to the magnetic conduction block 12 is greater than the centrifugal force it receives at the highest rotational speed of the rotor, and the radial clamping force provided by the retaining ring 14 to the permanent magnet assembly 13 is greater than the centrifugal force it receives during the rotation at the highest rotational speed of the rotor.

[0057] In this embodiment, the retaining ring 14 is made of carbon fiber material. Based on this, the way the retaining ring 14 is installed at the back plate 11 can be one of the following: First, the carbon fiber infiltrated with the matrix material (which can be epoxy resin) is wound layer by layer around the outer circumference of the intermediate component (the component composed of the back plate 11, a plurality of magnetic conduction blocks 12 and a plurality of permanent magnet assemblies 13) with a preset tension, and after the winding is completed, it is heated and cured into shape. Second, the retaining ring 14 is directly formed first, and then the retaining ring 14 and the intermediate component are cold-mounted in a liquid nitrogen environment, so as to ensure that after returning to normal temperature, the retaining ring 14 and the intermediate component are in an interference fit, and further enable the retaining ring 14 to provide sufficient radial clamping force to the magnetic conduction block 12 and the permanent magnet assembly 13.

[0058] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation on the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A disc-type motor rotor, characterized in that: include: A back plate (11) made of a non-magnetic material; A plurality of magnetic conductive blocks (12) are installed on the same side of the back plate (11), the plurality of magnetic conductive blocks (12) are arranged at intervals along the circumferential direction, and limiting grooves (110) are formed between adjacent magnetic conductive blocks (12); A plurality of permanent magnet components (13) are tangentially magnetized, each of the permanent magnet components (13) is radially inserted into a limiting groove (110), and the groove wall of the limiting groove (110) presses the corresponding permanent magnet component (13) against the back plate (11) along the axial direction.

2. The disc motor rotor according to claim 1, characterized in that: The magnetic conductive block (12) has a first side wall (126) and a second side wall (127) on both sides along the circumferential direction, and the first side wall (126), the second side wall (127) adjacent to the magnetic conductive block (12) and the back plate (11) are arranged to form the limiting groove (110), wherein: At least one of the first side wall (126) and the second side wall (127) arranged opposite to each other is an inclined surface, so that the magnetic conductive block (12) presses the corresponding permanent magnet assembly (13) against the back plate (11) along the axial direction; or At least one of the first side wall (126) and the second side wall (127) that are arranged opposite to each other is concave-convexly matched with the corresponding permanent magnet assembly (13).

3. The disc motor rotor according to claim 1, characterized in that: The magnetic conductive block (12) is fixed to the back plate (11) by bonding or fastener connection.

4. The disc motor rotor according to claim 1, characterized in that: The magnetic conductive block (12) and the back plate (11) are respectively provided with a first dovetail groove (125) and a second dovetail groove (117) on one side facing each other; The disc-type motor rotor also includes a plug-in connector (18), and two ends of the plug-in connector (18) along the axial direction are respectively plugged into the first dovetail groove (125) and the second dovetail groove (117).

5. The disc motor rotor according to any one of claims 1 to 4, characterized in that: It also includes a pressure plate (15) made of non-magnetic material, the pressure plate (15) is connected to the back plate (11), and the inner circumferential surface of the magnetic conductive block (12) and the inner circumferential surface of the permanent magnet assembly (13) are evenly abutted against the pressure plate (15).

6. The disc motor rotor according to claim 5, characterized in that: The pressing plate (15) is annular, and the outer peripheral surface of the pressing plate (15) comprises a plurality of abutting surfaces (151) and a plurality of first abutting inclined surfaces (152), and the abutting surfaces (151) and the first abutting inclined surfaces (152) are arranged alternately; The inner circumferential surface of the permanent magnet assembly (13) abuts against the abutting surface (151), the inner circumferential surface of the magnetic conductive block (12) is configured as a second abutting inclined surface (128), and the first abutting inclined surface (152) abuts against the second abutting inclined surface (128), so that the pressure plate (15) presses the magnetic conductive block (12) against the back plate (11) along the axial direction.

7. The disc motor rotor according to claim 5, characterized in that: The pressing plate (15) and the back plate (11) are bonded or connected via fasteners.

8. The disc motor rotor according to any one of claims 1 to 4, characterized in that: It also includes a retaining ring (14) made of non-magnetic material, the retaining ring (14) surrounds the outer circumference of the back plate (11), and the outer circumferential surface of the magnetic conductive block (12) and the outer circumferential surface of the permanent magnet assembly (13) are both against the retaining ring (14).

9. A disc motor, characterized in that: It comprises a stator (20) and a disc-type motor rotor as claimed in any one of claims 1 to 8, wherein the stator (20) and the disc-type motor rotor are arranged in a circumferential direction.

10. The disk motor according to claim 9, characterized in that: The pole slots of the stator (20) are matched to form 9N slots and 2N poles, wherein N is a positive integer.

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