Disc type motor and rotor assembly thereof

Abstract

According to the disc type motor and the rotor assembly thereof provided by the invention, the permanent magnets and the magnetic conductive blocks are alternately arranged on the back plate, and the pressing plate is arranged between the permanent magnets and the magnetic conductive blocks. And the pressing plate is matched with the concave parts formed by the inclined surfaces of the two side walls of the permanent magnet and the magnetic conductive block by utilizing the convex parts formed by the inclined surfaces of the two side walls of the pressing plate, so that the permanent magnet and the magnetic conductive block are fixed on the back plate. On one hand, the slopes are arranged at the corners of the two sides of the magnetic conducting block, the situation that magnetic lines of force are concentrated at the right-angle side, magnetic density saturation is caused, and loss is sharply increased can be prevented, and meanwhile, the slopes are arranged on the two sides of the permanent magnet, axial force borne by the permanent magnet is converted into tangential force which is applied to the magnetic conducting block through the pressing plate; the two sides of the magnetic conductive block can be balanced after being subjected to symmetrical force, so that the rotor structure is stable. And on the other hand, the rotor structure adopts the alternative arrangement configuration of the permanent magnets and the magnetic conductive blocks, and the magnetic resistance torque is generated by making full use of asymmetry of magnetic circuits, so that the use amount of the permanent magnets of the disc type motor can be saved and the cost of the disc type motor can be reduced on the premise of not reducing the torque.

Description

Technical Field

[0001] The present invention belongs to the technical field of disc motors, and particularly relates to a disc motor and a rotor assembly thereof. Background Art

[0002] A disc motor (also known as an axial permanent magnet motor) has an axial magnetic flux direction, which determines that its structure is different from that of a common radial motor. The axial flux motor has many advantages such as small volume, low noise, high power density, and excellent heat dissipation performance. At present, most disc motors only use permanent magnets to generate permanent magnet torque. Since permanent magnets are expensive, the cost of a disc motor that only uses permanent magnets is relatively high under the same torque.

[0003] In addition, for the connection of permanent magnets, some solutions require using screws to lock the pressing plate to press the permanent magnets. For the rotor of a high-speed rotating motor, the screws are at risk of loosening and falling off, greatly reducing the reliability of the motor. In other solutions, only the connection method of gluing the magnetic conduction blocks is used, with low reliability and the risk of the permanent magnets falling off.

[0004] Therefore, how to save the amount of permanent magnets used in a disc motor without reducing the torque is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a disc motor and a rotor assembly thereof, which can save the amount of permanent magnets used in the disc motor and reduce the cost of the disc motor without reducing the torque.

[0006] To solve the above technical problems, the present invention provides a rotor assembly of a disc motor, including: a back plate, a plurality of permanent magnets, a plurality of magnetic conduction blocks, and a plurality of pressing plates;

[0007] The permanent magnets and the magnetic conduction blocks are alternately and spacedly arranged around the center of the back plate;

[0008] Both side walls of each pressing plate in the circumferential direction have inclined surfaces that are concave downward from top to bottom. The docking surfaces of the permanent magnets and the magnetic conduction blocks that cooperate with the pressing plates are both inclined surfaces that are concave upward from bottom to top. Adjacent two permanent magnets and the magnetic conduction blocks are fixed to the back plate through one pressing plate.

[0009] Optionally, in the rotor assembly of the above disc motor, each pressing plate is fixed to the back plate by screws.

[0010] Optionally, in the rotor assembly of the above disc motor, each pressing plate is provided with a through-radial slot on the side wall that cooperates with the magnetic conduction block. The slot is used to limit the axial displacement of the pressing plate and the magnetic conduction block, and the slot of the pressing plate can be connected to the magnetic conduction block along the radial direction.

[0011] Optionally, in the rotor assembly of the above-mentioned disc motor, the back plate is provided with avoidance grooves at the installation gaps of the pressing plates, for providing an avoidance space on the radial assembly path of the pressing plates.

[0012] Optionally, in the rotor assembly of the above-mentioned disc motor, the installation height of the permanent magnet on the back plate is lower than the installation height of the magnetic conduction block on the back plate.

[0013] Optionally, in the rotor assembly of the above-mentioned disc motor, it further includes a retaining ring arranged at the edge of the back plate for restricting the radial displacement of the permanent magnet and the magnetic conduction block.

[0014] Optionally, in the rotor assembly of the above-mentioned disc motor, the magnetic conduction block, the back plate and the retaining ring are of an integral structure;

[0015] or, the magnetic conduction block, the back plate and the retaining ring are of a split structure.

[0016] Optionally, in the rotor assembly of the above-mentioned disc motor, the magnetic conduction block is a magnetic conduction block made of magnetic conduction material, and / or, the back plate is a back plate made of magnetic conduction material, and / or, the retaining ring is a retaining ring made of steel or carbon fiber material.

[0017] The present invention provides a disc motor, including a rotating shaft, a stator assembly and the rotor assembly of the disc motor as described above;

[0018] The rotor assembly is sleeved on the rotating shaft, and the stator assembly is arranged on the outer peripheral side of the rotor assembly.

[0019] Optionally, in the above-mentioned disc motor, the disc motor is a double-stator single-rotor type disc motor, a single-stator single-rotor type disc motor, or a single-stator double-rotor type disc motor.

[0020] The present invention provides a rotor assembly of a disc motor, and its beneficial effects are as follows:

[0021] By alternately arranging permanent magnets and magnetic conduction blocks on the back plate, and arranging a pressing plate between the permanent magnets and the magnetic conduction blocks. The pressing plate uses the convex parts formed by the inclined surfaces on its two side walls to cooperate with the concave parts formed by the inclined surfaces on the two side walls of the permanent magnets and the magnetic conduction blocks, and fixes the permanent magnets and the magnetic conduction blocks on the back plate. On the one hand, inclined surfaces are provided at the two side corners of the magnetic conduction block, which can prevent the magnetic force lines from concentrating at the right-angle edges, causing magnetic density saturation at this place and resulting in a sharp increase in losses. At the same time, inclined surfaces are provided on both sides of the permanent magnet, converting the axial force received by the permanent magnet into a tangential force, and applying it to the magnetic conduction block through the pressing plate. After the two sides of the magnetic conduction block receive symmetrical forces, they can be in force balance, making the rotor structure stable. On the other hand, the rotor structure adopts an alternating arrangement configuration of permanent magnets and magnetic conduction blocks, making full use of the reluctance torque generated by the magnetic circuit asymmetry, and can save the permanent magnet usage of the disc motor and reduce the cost of the disc motor without reducing the torque.

[0022] The present invention also provides a disc motor having a rotor assembly, which has the same beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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 drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0024] Figure 1 It is a schematic structural diagram of an overall architecture of a disc motor provided by an embodiment of the present invention;

[0025] Figure 2 It is a front view of a rotor assembly provided by an embodiment of the present invention;

[0026] Figure 3 It is a schematic structural diagram of a rotor assembly provided by an embodiment of the present invention;

[0027] Figure 4 It is a partial enlarged view of a rotor assembly provided by an embodiment of the present invention;

[0028] Figure 5 It is a schematic structural diagram of the cooperation of a magnetic conduction block, a back plate and a retaining ring provided by an embodiment of the present invention;

[0029] Figure 6 It is a schematic structural diagram of a card slot provided by an embodiment of the present invention;

[0030] Figure 7 It is a schematic structural diagram of a permanent magnet provided by an embodiment of the present invention.

[0031] In the above figures:

[0032] 1 - Rotor assembly; 101 - Back plate; 1011 - Avoidance groove; 102 - Permanent magnet; 1021 - First inclined surface; 103 - Magnetic conduction block; 1031 - Second inclined surface; 104 - Pressure plate; 1041 - Card slot; 105 - Retaining ring; 106 - Pressure plate installation gap;

[0033] 2 - Stator assembly. Specific implementation manner

[0034] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as a limitation to the present invention.

[0035] The core of the present invention is to provide a disc motor and its rotor assembly, which can save the amount of permanent magnets used in the disc motor and reduce the cost of the disc motor without reducing the torque.

[0036] For the convenience of understanding, before the detailed description, the following concepts are introduced:

[0037] Magnetoresistance effect: The magnetic field lines always close along the path with the smallest magnetic resistance.

[0038] Magnetic conduction block: Made of magnetic conduction material, with high magnetic permeability and small magnetic resistance.

[0039] Permanent magnet: Made of permanent magnetic material, such as rare earth permanent magnet, ferrite, etc. Generates a permanent magnetic field, with a magnetic permeability close to that of air, low magnetic permeability and very large magnetic resistance.

[0040] d-axis: The central axis of the permanent magnet.

[0041] q-axis: The symmetry line between two adjacent d-axes, with a 90-degree electrical angle difference from the d-axis.

[0042] Magnetoresistance torque: Qualitative understanding: The torque generated based on the magnetoresistance effect. Quantitative understanding: (Ld - Lq) * id * iq, where Ld is the d-axis inductance, Lq is the q-axis inductance, id is the d-axis current, and iq is the q-axis current. Therefore, the greater the difference between the d-axis and q-axis inductances, the greater the magnetoresistance torque.

[0043] Salient pole property / salient pole effect: Refers to the inconsistency between the d-axis inductance and the q-axis inductance of a permanent magnet motor. The d-axis magnetic flux direction contains a permanent magnet, with a smaller magnetic permeability than the q-axis, so generally Ld is less than Lq. From the electromagnetic torque equation, it can be seen that if Ld is not equal to Lq, the torque output by the motor has an additional part called the magnetoresistance torque.

[0044] Meanwhile, to enable those skilled in the art to better understand the technical solution provided by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] Specifically, please refer to Figures 1-7 , a rotor assembly 1 of a disc motor provided by the present invention includes: a back plate 101, a plurality of permanent magnets 102, a plurality of magnetic conduction blocks 103, and a plurality of pressing plates 104.

[0046] Among them, the permanent magnets 102 and the magnetic conduction blocks 103 are alternately and spaced around the center of the back plate 101 to make full use of the reluctance torque generated by the magnetic circuit asymmetry. The principle is as follows: Since a permanent magnet 102 with a certain thickness is placed on the d-axis of the rotor assembly 1, the magnetic reluctance is very large, while the q-axis is a magnetic conduction block 103 with a very small magnetic reluctance. Therefore, this rotor structure makes the inductance difference between the d-axis and the q-axis extremely large, and makes full use of the inductance asymmetry between the d-axis and the q-axis to generate a reluctance torque. At the same time, the presence of the permanent magnet 102 will also generate a permanent magnet torque when interacting with the stator.

[0047] A pressing plate installation gap 106 for installing the pressing plate 104 is reserved between adjacent permanent magnets 102 and magnetic conduction blocks 103, and a pressing plate 104 is arranged on the pressing plate installation gap 106. The upper parts of the two side walls of the pressing plate 104 in the circumferential direction are inclined surfaces (forming convex parts) that are concave from top to bottom. The docking surfaces of the permanent magnet 102 and the magnetic conduction block 103 that cooperate with the pressing plate 104 are inclined surfaces (forming concave parts) that are concave from bottom to top. Each pressing plate 104 is respectively pressed between adjacent permanent magnets 102 and magnetic conduction blocks 103 to fix the permanent magnets 102 and the magnetic conduction blocks 103 on the back plate 101.

[0048] As Figure 7 shown, the inclined surfaces on the two side walls of the permanent magnet 102 are the first inclined surfaces 1021, and the inclination angle can be specifically 20°. As Figure 5 shown, the inclined surfaces on the two side walls of the magnetic conduction block 103 are the second inclined surfaces 1031.

[0049] It should be noted that the design concept of this application is as follows. In order to avoid magnetic flux concentration, on the two side walls in the circumferential direction of the magnetic conduction block 103, an inclined surface concave upward from bottom to top is respectively provided, and this inclined surface can greatly reduce the rotor loss. In order to make full use of the inclined surface design of the magnetic conduction block 103 and achieve connection and cooperation with the pressure plate 104, on the side wall of the pressure plate 104 opposite to the magnetic conduction block 103, an inclined surface concave downward from top to bottom is designed, so that the pressure plate 104 cooperates with the magnetic conduction block 103 to fix the magnetic conduction block 103 on the back plate 101. Similarly, on the two side walls in the circumferential direction of the permanent magnet 102, an inclined surface concave upward from bottom to top is respectively provided, and on the side wall of the pressure plate 104 opposite to the permanent magnet 102, an inclined surface concave downward from top to bottom is designed, so that the inclined surface of the permanent magnet 102 and the pressure plate 104 cooperate to convert the axial force received by the permanent magnet 102 into a tangential force acting on the magnetic conduction block 103, and the magnetic conduction block 103 is balanced in the left and right forces, greatly improving the fixing strength of the permanent magnet 102 and the reliability of the rotor structure.

[0050] A rotor assembly 1 of a disc motor provided by the present invention alternately arranges permanent magnets 102 and magnetic conduction blocks 103 on a back plate 101, and arranges a pressure plate 104 between the permanent magnets 102 and the magnetic conduction blocks 103. The convex part formed by the inclined surfaces on the two side walls of the pressure plate 104 cooperates with the concave part formed by the inclined surfaces on the two side walls of the permanent magnet 102 and the magnetic conduction block 103 to fix the permanent magnet 102 and the magnetic conduction block 103 on the back plate 101. On the one hand, inclined surfaces are provided at the two side corners of the magnetic conduction block 103, which can prevent magnetic lines of force from concentrating at the right-angle edges, causing magnetic flux saturation here and resulting in a sharp increase in losses. At the same time, inclined surfaces are provided on both sides of the permanent magnet 102 to convert the axial force received by the permanent magnet 102 into a tangential force, which is applied to the magnetic conduction block 103 through the pressure plate 104. After the magnetic conduction block 103 receives symmetric forces on both sides, it can be in force balance, making the rotor structure stable. On the other hand, the rotor structure adopts an alternating arrangement configuration of permanent magnets 102 and magnetic conduction blocks 103, making full use of the reluctance torque generated by the magnetic circuit asymmetry, and at the same time using the permanent magnets 102 to generate permanent magnet torque and the reluctance effect to generate reluctance torque, saving the amount of permanent magnets 102 used in the disc motor under the same torque and reducing the cost of the disc motor. At the same time, the increased rotor iron core when designing the reluctance torque is used to improve the stiffness and strength of the rotor assembly 1, so that the rotor assembly 1 can withstand higher speeds, greatly improving the power density of the motor.

[0051] There are various forms of the way the pressure plate 104 is fixed to the back plate 101.

[0052] In a specific embodiment, each pressing plate 104 can be fixed to the back plate 101 by screws, so that the permanent magnet 102 and the magnetic conduction block 103 can be stably connected to the back plate 101. Thus, the permanent magnet 102 and the magnetic conduction block 103 do not need to be fixed by screws. The axial force of the permanent magnet 102 is converted into a tangential force by the pressing plate 104 and acts on the magnetic conduction block 103. The magnetic conduction block 103 is balanced in the left and right forces, making the fixation of the permanent magnet 102 more reliable.

[0053] In another preferred specific embodiment, each pressing plate 104 is provided with a radially penetrating card slot 1041 on the side wall cooperating with the magnetic conduction block 103. The card slot 1041 is used to limit the axial displacement of the pressing plate 104 and the magnetic conduction block 103. The card slot 1041 of the pressing plate 104 can be connected to the magnetic conduction block 103 along the radial direction. Further, the back plate 101 is provided with a relief groove 1011 at each pressing plate installation gap 106 for providing a relief space on the radial assembly path of the pressing plate 104. The number of the relief grooves 1011 is multiple and corresponds to the pressing plates 104 one by one. Each relief groove 1011 extends radially on the back plate 101. The pressing plate 104 is inserted from the relief groove 1011 near the central shaft hole. The bottom of the pressing plate 104 slides in the relief groove 1011, providing guidance on the one hand and allowing the pressing plate 104 to sink a certain distance so that the card slot 1041 just cooperates with the magnetic conduction block 103 on the other hand. The pressing plate 104 is moved closer to the magnetic conduction block 103 along the radial direction until the magnetic conduction block 103 just cooperates with the inclined surface and the card slot 1041 of the pressing plate 104, ensuring that the pressing plate 104 exactly fixes the magnetic conduction blocks 103 and the permanent magnets 102 on both sides.

[0054] Particularly, the inclined surface of the pressing plate 104 cooperating with the magnetic conduction block 103 and the card slot 1041 form a concave structure.

[0055] With the above arrangement, only limited by the card slot 1041, there is no need to fix the pressing plate 104 with screws, and the reliability is high.

[0056] On the basis of the above specific embodiment, the installation height of the permanent magnet 102 on the back plate 101 is lower than the installation height of the magnetic conduction block 103 on the back plate 101. The top height of the permanent magnet 102 is lower than the top height of the magnetic conduction block 103. On the one hand, it makes the air gap at the magnetic conduction block 103 small and the air gap at the permanent magnet 102 large, further increasing the difference between the d-axis and q-axis inductances and increasing the asymmetry of the d-axis and q-axis inductances (magnetic circuits), thereby increasing the reluctance torque. On the other hand, since the assembly and processing accuracy of the permanent magnet 102 itself is not high, the height of the magnetic conduction block 103 is higher than that of the permanent magnet 102, avoiding stator scratching caused by low processing and assembly accuracy of the permanent magnet 102 and improving the overall flatness accuracy of the rotor.

[0057] This solution also includes a retaining ring 105 arranged at the edge of the back plate 101 for restricting the radial displacement of the permanent magnet 102 and the magnetic conduction block 103.

[0058] The magnetic conduction block 103, the back plate 101 and the retaining ring 105 can be of an integral structure, such as being fixed by integral injection molding. When an integral structure is adopted, the rotor assembly 1 has high structural strength, can operate at a higher rotational speed, and improves the motor power density.

[0059] Alternatively, the magnetic conduction block 103, the back plate 101 and the retaining ring 105 can also be of a split structure.

[0060] The magnetic conduction block 103 and the back plate 101 can be made of magnetic conduction materials, such as silicon steel sheets, steel, SMC, etc. When the magnetic conduction block 103, the back plate 101 and the retaining ring 105 are of an integral structure, the retaining ring 105 is made of magnetic conduction materials. When the magnetic conduction block 103, the back plate 101 and the retaining ring 105 are of a split structure, the retaining ring 105 can be made of high-strength materials, such as steel, carbon fiber and other materials.

[0061] When the rotor assembly 1 generates centrifugal force during rotation, the retaining ring 105 can limit the pressing plate 104, the magnetic conduction block 103 and the permanent magnet 102, preventing them from moving away from the central axis direction. In order to prevent loosening or falling off of the pressing plate 104 and the permanent magnet 102 during the assembly process, in one form, the pressing plate 104, the magnetic conduction block 103 and the permanent magnet 102 can be set to an interference fit to improve the fastening during connection; in another form, glue can be applied around the assembled pressing plate 104, magnetic conduction block 103 and permanent magnet 102 to further reinforce each component.

[0062] Specifically, the longitudinal cross-sections of the permanent magnet 102 and the magnetic conduction block 103 are both trapezoidal structures, and the cross-sectional areas gradually increase from top to bottom. The cross-sections of the permanent magnet 102 and the magnetic conduction block 103 are both fan-shaped structures.

[0063] For the consideration of torque density, the radian of the permanent magnet 102 can account for about 0.5 - 0.6 of the pole pitch.

[0064] In addition, the present invention also provides a disc motor, including a rotating shaft, a stator assembly 2 and the rotor assembly 1 of the disc motor as described in the above embodiments.

[0065] The rotor assembly 1 is sleeved on the rotating shaft, and the stator assembly 2 is arranged on the outer peripheral side of the rotor assembly 1.

[0066] Obviously, the disc motor with the above rotor assembly 1 has the same beneficial effects, which will not be elaborated here.

[0067] Furthermore, the disc motor can be a double-stator single-rotor type disc motor, a single-stator single-rotor type disc motor, or a single-stator double-rotor type disc motor.

[0068] Such as Figure 1The overall architecture of the motor shown adopts a dual-stator single-rotor scheme, including two stator assemblies 2 and one rotor assembly 1. The two stator assemblies 2 are on both sides, and the rotor assembly 1 is in the middle. Of course, it can also be extended to a single-stator single-rotor or single-stator dual-rotor, etc. The stator structure adopts a traditional configuration.

[0069] In the description of the present application, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0070] In the description of the present application, the meaning of "a plurality" is more than two. If the first and second are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0071] As shown in the present application and the claims, unless the context clearly indicates an exceptional situation, words such as "a", "an", "one", and / or "the" are not specifically singular, but may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. An element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, commodity or device including the element.

[0072] Among them, in the description of the embodiments of the present application, unless otherwise stated, " / " means "or". For example, A / B may mean A or B; "and / or" herein is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.

[0073] In the description of the present application, unless otherwise clearly defined, words such as "set", "install", "connect", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0074] In this specification, the various embodiments are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0075] In this article, specific examples are used to elaborate on the principles and implementation modes of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A rotor assembly of a disc motor, characterized in that, Comprising: A back plate, a plurality of permanent magnets, a plurality of magnetic conduction blocks and a plurality of pressing plates; The permanent magnets and the magnetic conduction blocks are alternately and spacedly arranged around the center of the back plate; Both side walls of each pressing plate have inclined surfaces that are concave downward from top to bottom in the circumferential direction. The docking surfaces of the permanent magnets and the magnetic conduction blocks that cooperate with the pressing plates are both inclined surfaces that are concave upward from bottom to top. Adjacent two of the permanent magnets and the magnetic conduction blocks are fixed to the back plate through one of the pressing plates.

2. The rotor assembly of the disc motor according to claim 1, characterized in that, Each of the pressing plates is fixed to the back plate by screws.

3. The rotor assembly of the disc-type motor according to claim 1, characterized in that, Each of the pressing plates is provided with a through-radial slot on the side wall that cooperates with the magnetic conduction block. The slot is used to limit the axial displacement of the pressing plate and the magnetic conduction block, and the slot of the pressing plate can be connected to the magnetic conduction block along the radial direction.

4. The rotor assembly of the disc motor according to claim 3, characterized in that, The back plate is provided with a relief groove at the installation gap of each pressing plate, for providing a relief space on the radial assembly path of the pressing plate.

5. The rotor assembly of the disc motor according to claim 1, characterized in that, The installation height of the permanent magnets on the back plate is lower than the installation height of the magnetic conduction blocks on the back plate.

6. The rotor assembly of the disc motor according to claim 1, characterized in that, It further includes a retaining ring arranged at the edge of the back plate for limiting the radial displacement of the permanent magnets and the magnetic conduction blocks; 7. The rotor assembly of the disc motor according to claim 6, characterized in that The magnetic conduction block, the back plate and the retaining ring are of an integral structure; Or, the magnetic conduction block, the back plate and the retaining ring are of a split structure.

8. The rotor assembly of the disc motor according to claim 6, wherein, The magnetic conduction block is a magnetic conduction block made of a magnetic conduction material, and / or, the back plate is a back plate made of a magnetic conduction material, and / or, the retaining ring is a retaining ring made of steel or carbon fiber material.

9. A disc motor, characterized in that, Comprising a rotating shaft, a stator assembly and a rotor assembly of the disc motor according to any one of claims 1-8; The rotor assembly is sleeved on the rotating shaft, and the stator assembly is arranged on the outer peripheral side of the rotor assembly.

10. The disc motor according to claim 9, wherein, The disc motor is a double-stator single-rotor type disc motor, a single-stator single-rotor type disc motor, or a single-stator double-rotor type disc motor.

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