Rotor assembly and disc type motor

Abstract

The invention discloses a rotor assembly and a disc type motor, and relates to the technical field of motors. The rotor assembly comprises a magnetic conductive part, a permanent magnet part and a connecting part. The magnetic conductive parts are made of magnetic conductive materials, the permanent magnet parts are made of permanent magnet materials, the multiple magnetic conductive parts and the multiple permanent magnet parts are alternately arranged to form the rotor disc of an annular structure, and the connecting parts are used for achieving reliable connection of the magnetic conductive parts and the permanent magnet parts. According to the rotor assembly disclosed by the invention, the permanent magnet part is utilized to generate the permanent magnet torque, and the reluctance effect is utilized to generate the reluctance torque, so that the use amount of the permanent magnet part is saved under the same torque, and the production cost of the disc type motor is reduced.

Description

Technical Field

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

[0002] The magnetic lines of force of a disc motor are along the axial direction. At present, most disc motors only use the permanent magnet part to generate permanent magnet torque. However, due to the high cost of the permanent magnet part, the cost of this solution is relatively high under the same torque. In addition, in some existing technologies, the magnetic steel (permanent magnet part) is fixed by using screws to lock the pressure plate. For a motor rotor rotating at high speed, the screws are at risk of loosening and falling off, greatly reducing the reliability of the motor; in some other existing technologies, the magnetic steel is only glued, and the connection reliability is low, and the magnetic steel is also at risk of falling off.

[0003] Therefore, how to solve at least one of the above problems has become an urgent technical problem for those skilled in the art. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a rotor assembly to reduce the production cost of a disc motor and improve the reliability of the permanent magnet part fixation.

[0005] Another object of the present invention is to provide a disc motor including the above rotor assembly.

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

[0007] A rotor assembly includes:

[0008] A plurality of magnetic conduction parts, which are made of magnetic conduction materials;

[0009] A plurality of permanent magnet parts, which are made of permanent magnet materials, and the permanent magnet parts and the magnetic conduction parts are alternately arranged to form a rotor disc with an annular structure;

[0010] A connection part for connecting the magnetic conduction part and the permanent magnet part.

[0011] Optionally, in the above rotor assembly, the connection part includes:

[0012] A basic fixing part, and both the magnetic conduction part and the permanent magnet part are arranged on the end face of the basic fixing part;

[0013] An injection molding shell, which is arranged on the basic fixing part and is used to press the magnetic conduction part and the permanent magnet part onto the basic fixing part.

[0014] Optionally, in the above-mentioned rotor assembly, the magnetic conduction part extends along the radial direction of the rotor disc, and the two side edges facing away from the base fixing part are arranged as a first inclined surface structure, and the first inclined surface structure is used to avoid the concentration of magnetic lines of force.

[0015] Optionally, in the above-mentioned rotor assembly, the permanent magnet part extends along the radial direction of the rotor disc, and the two side edges facing away from the base fixing part are arranged as a second inclined surface structure, and the second inclined surface structure is used for the injection molded housing to be pressed tightly.

[0016] Optionally, in the above-mentioned rotor assembly, along the axial direction of the rotor disc, the extension length of the magnetic conduction part is greater than the extension length of the permanent magnet part; and / or,

[0017] Along the axial direction of the rotor disc, one side of the magnetic conduction part and the permanent magnet part facing away from the base fixing part protrudes from the injection molded housing.

[0018] Optionally, in the above-mentioned rotor assembly, the base fixing part includes:

[0019] An annular part, which is an annular plate-like structure, the magnetic conduction part and the permanent magnet part are both arranged on the end surface of the annular part, and the injection molded housing is arranged on the surface of the annular part;

[0020] A retaining ring part, which is arranged on the outer ring of the annular part and extends along the axial direction of the annular part, and is used for abutting and limiting each of the magnetic conduction parts and the permanent magnet parts.

[0021] Optionally, in the above-mentioned rotor assembly, the injection molded housing includes a first housing and a second housing, and the first housing and the second housing are respectively arranged on the two end surfaces of the annular part;

[0022] An injection hole is formed on the annular part, and the first housing and the second housing are injection connected at the injection hole, and / or, the first housing and the second housing both extend to the side wall of the retaining ring part facing away from the annular part and are connected.

[0023] Optionally, in the above-mentioned rotor assembly, the injection hole includes:

[0024] The first injection hole, there are multiple ones, the magnetic conduction parts and the permanent magnet parts are arranged at intervals, and the first injection hole is located between the magnetic conduction parts and the permanent magnet parts;

[0025] The second injection hole, there are multiple ones, and the second injection hole is closer to the annular inner hole of the annular part than the rotor disc.

[0026] Optionally, in the above-mentioned rotor assembly, the annular part and the retaining ring part are of an integral structure or a split structure; and / or,

[0027] The magnetic conduction part and the annular part are of an integral structure or a split structure.

[0028] Optionally, in the above rotor assembly, one end of the permanent magnet part facing the retaining ring part is a curved surface structure that closely fits the side wall of the retaining ring part; or,

[0029] The side wall of the retaining ring part facing the permanent magnet part is provided with a positioning profile for cooperating with the permanent magnet part.

[0030] Optionally, in the above rotor assembly, the connecting part is an injection molded housing, and the injection molded housing is used to injection mold the magnetic conduction part and the permanent magnet part into an integral structure.

[0031] A disc motor includes the above rotor assembly.

[0032] The rotor assembly provided by the present invention includes a magnetic conduction part, a permanent magnet part, and a connecting part. The magnetic conduction part is prepared from a magnetic conduction material, the permanent magnet part is prepared from a permanent magnet material, both the magnetic conduction part and the permanent magnet part are multiple, and they are alternately arranged to form a rotor disc with an annular structure. The connecting part is used to realize the reliable connection between the magnetic conduction part and the permanent magnet part. The d-axis is the central axis of the permanent magnet part, the q-axis is the symmetry line of two adjacent d-axes and is 90 electrical degrees different from the d-axis. The central axis of the magnetic conduction part coincides with the q-axis. By setting a permanent magnet part with a certain thickness and a very large magnetic resistance on the d-axis, and a magnetic conduction part with a very small magnetic resistance on the q-axis, the inductance difference between the d-axis and the q-axis is extremely large, so as to make full use of the magnetic resistance torque generated by the inductance asymmetry between the d-axis and the q-axis. At the same time, the presence of the permanent magnet part will also generate a permanent magnet torque when interacting with the stator assembly.

[0033] Compared with the prior art, the rotor assembly provided by the present invention utilizes the permanent magnet torque generated by the permanent magnet part and the magnetic resistance torque generated by the magnetic resistance effect, saves the usage amount of the permanent magnet part under the same torque, and reduces the production cost of the disc motor.

[0034] The disc motor provided by the present invention includes the above rotor assembly, so it also has the above structure and beneficial effects, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 It is a schematic diagram of the relative positions of the stator assembly and the rotor assembly disclosed in the embodiments of the present invention;

[0037] Figure 2 is Figure 1 exploded view of;

[0038] Figure 3 is the front view of the rotor assembly disclosed in the embodiment of the present invention;

[0039] Figure 4 is the front view of the rotor assembly without the injection - molded housing in the embodiment of the present invention;

[0040] Figure 5 is the side view of the rotor assembly without the injection - molded housing in the embodiment of the present invention;

[0041] Figure 6 is the partial exploded view of the rotor assembly without the injection - molded housing in the embodiment of the present invention;

[0042] Figure 7 is the structural schematic diagram of the rotor core of the rotor assembly disclosed in the embodiment of the present invention;

[0043] Figure 8 is the structural schematic diagram of the injection - molded housing of the rotor assembly disclosed in the embodiment of the present invention.

[0044] Among them, 100 is the rotor assembly, 110 is the annular part, 111 is the annular inner hole, 112 is the first injection hole, 113 is the first injection hole, 120 is the permanent - magnet part, 121 is the second inclined - surface structure, 130 is the magnetic - conducting part, 131 is the first inclined - surface structure, 140 is the injection - molded housing, 141 is the injection - molded inner ring, 142 is the injection - molded outer ring, 143 is the first injection - connecting part, 144 is the second injection - connecting part, 150 is the retaining - ring part;

[0045] 200 is the stator assembly. Detailed implementation manners

[0046] The core of the present invention lies in disclosing a rotor assembly to reduce the production cost of the disc - type motor and improve the reliability of the permanent - magnet part fixation.

[0047] Another object of the present invention is to provide a disc - type motor including the above - mentioned rotor assembly.

[0048] Hereinafter, the embodiments will be described with reference to the drawings. In addition, the embodiments shown below do not impose any limitation on the content of the invention described in the claims. Further, all the contents of the configurations shown in the following embodiments are not necessarily essential for the solution of the invention described in the claims. It should be noted that, for the sake of description, only the parts related to the relevant invention are shown in the drawings. Without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0049] Combined with Figure 3, the rotor assembly 100 disclosed in the embodiments of the present invention includes a magnetic conductive part 130, a permanent magnetic part 120, and a connecting part. The magnetic conductive part 130 is made of a magnetic conductive material, the permanent magnetic part 120 is made of a permanent magnetic material, both the magnetic conductive part 130 and the permanent magnetic part 120 are multiple, and they are alternately arranged to form a rotor disc with an annular structure. The connecting part is used to realize the reliable connection between the magnetic conductive part 130 and the permanent magnetic part 120.

[0050] The d-axis is the central axis of the permanent magnetic part 120, the q-axis is the symmetry line of two adjacent d-axes, and it is 90 electrical degrees different from the d-axis. The central axis of the magnetic conductive part 130 coincides with the q-axis. By setting the permanent magnetic part 120 with a certain thickness and a very large magnetic resistance on the d-axis, and the magnetic conductive part 130 with a very small magnetic resistance on the q-axis, the inductance gap between the d-axis and the q-axis is extremely large, so as to make full use of the magnetic resistance torque generated by the inductance asymmetry between the d-axis and the q-axis. At the same time, the existence of the permanent magnetic part 120 will also generate a permanent magnetic torque when interacting with the stator assembly 200.

[0051] Compared with the prior art, the rotor assembly 100 disclosed in the embodiments of the present invention uses the permanent magnetic part 120 to generate a permanent magnetic torque and the magnetoresistive effect to generate a magnetoresistive torque, saving the amount of the permanent magnetic part 120 under the same torque and reducing the production cost of the disc motor.

[0052] Specifically, the magnetic conductive part 130 is made of a magnetic conductive material with a high magnetic permeability and has a small magnetic resistance. The permanent magnetic part 120 is composed of permanent magnetic materials such as rare earth permanent magnets and ferrite, which is used to generate a permanent magnetic field, has a very low magnetic permeability, is close to air, and has a very large magnetic resistance. Through the symmetrical and alternating arrangement of the permanent magnetic part 120 and the magnetic conductive part 130, the magnetic resistance torque generated by the asymmetry of the magnetic circuit can be fully utilized.

[0053] Combined with Figure 3 , both the permanent magnetic part 120 and the magnetic conductive part 130 are arc-shaped structures to enclose the rotor disc with an annular structure. Considering the torque density, the radian of the permanent magnetic part 120 can account for about 0.5 - 0.6 of the pole pitch. If the permanent magnetic part 120 is replaced with air, the rotor assembly 100 and the stator assembly 200 can only generate a magnetic resistance torque when interacting, and cannot generate a permanent magnetic torque, but the production cost can be further reduced.

[0054] In order to realize the reliable fixation of the permanent magnetic part 120 and the magnetic conductive part 130, in a specific embodiment disclosed in the present invention, the connecting part includes a basic fixing part and an injection molding housing 140. Both the permanent magnetic part 120 and the magnetic conductive part 130 are arranged on the end surface of the basic fixing part. The injection molding housing 140 is injection molded on the basic fixing part and presses the permanent magnetic part 120 and the magnetic conductive part 130 on the basic fixing part. Specifically, the injection molding housing 140 realizes the fixed connection between the permanent magnetic part 120 and the magnetic conductive part 130 and the basic fixing part by injecting on the edge positions of the permanent magnetic part 120 and the magnetic conductive part 130 and the outer surface of the basic fixing part.

[0055] In this embodiment, the magnetic conduction part 130 and the permanent magnet part 120 are fixed on the basic fixing part by injection molding, without using screws to fix the pressing plate. The structure has higher reliability. Moreover, the injection molding shell 140 can fill the concave and uneven parts on the rotor disc, reduce the wind abrasion during the rotation of the rotor assembly 100, improve the motor efficiency, and extend the service life.

[0056] Combined with the actual layout of the rotor assembly 100 and the stator assembly 200, the rotor disc (magnetic conduction part 130 and permanent magnet part 120) can be arranged on only one end face of the basic fixing part or on both end faces of the basic fixing part at the same time. When rotor discs are arranged on both end faces of the basic fixing part, the rotor discs at both ends of the basic fixing part are symmetrical to each other.

[0057] For example, when it is a single stator and single rotor structure, the rotor assembly 100 is provided with a rotor disc only on one end face facing the stator assembly 200; combined Figure 1 and Figure 2 , when it is a double stator and single rotor structure, rotor discs are provided on both end faces of the rotor assembly 100.

[0058] Since the magnetic lines of force will concentrate at the right-angle edges of the magnetic conduction part 130, causing magnetic density saturation and a sharp increase in losses, the magnetic conduction part 130 is arranged to extend along the radial direction of the basic fixing part or the rotor disc, and both side edges facing away from the basic fixing part are inclined-plane structures. This inclined-plane structure is defined as the first inclined-plane structure 131. Combined Figure 4 , the first inclined-plane structure 131 is inclined from the side far from the basic fixing part to the side close to the basic fixing part, which can avoid the concentration of magnetic lines of force.

[0059] Since the magnetic conduction part 130 and the basic fixing part can be an integral structure or a split structure, when the magnetic conduction part 130 and the basic fixing part are a split structure, the first inclined-plane structure 131 can also be used for the injection molding shell 140 to press tightly, so that the pressing force of the injection molding shell 140 on the magnetic conduction part 130 changes from an axial force to a tangential force, realizing the reliable fixation of the magnetic conduction part 130 and the basic fixing part.

[0060] Among them, the inclination angle of the first inclined-plane structure 131 can be set to 20°±10°, and the two first inclined-plane structures 131 on each magnetic conduction part 130 are symmetrical to each other, so as to ensure that when the injection molding shell 140 presses tightly on the magnetic conduction part 130, the magnetic conduction part 130 can be in force balance and ensure the stability of the structure of the rotor assembly 100.

[0061] The permanent magnet part 120 can be pressed tightly on the basic fixing part by the injection molding shell 140 in various ways. For example, the permanent magnet part 120 is pressed tightly by the injection molding shell 140 by setting an inclined plane on the side of the permanent magnet part 120 facing away from the basic fixing part.

[0062] Specifically, the permanent magnet part 120 extends along the radial direction of the base fixing part or the rotor disk, and both side edges facing away from the base fixing part are provided with a second inclined surface structure 121. The second inclined surface structure 121 inclines from the side of the permanent magnet part 120 away from the base fixing part to the side close to the base fixing part, and the injection molded housing 140 can be pressed against the second inclined surface structure 121. The two second inclined surface structures 121 on each permanent magnet part 120 are symmetrical to each other to ensure the structural stability of the rotor assembly 100, and the inclination angle of the second inclined surface structure 121 can be freely set.

[0063] To increase the reluctance of the permanent magnet part 120, combined with Figure 5 , in the axial direction of the rotor disk, the extending length of the magnetic conduction part 130 is greater than that of the permanent magnet part 120 (that is, the magnetic conduction part 130 has a greater thickness than the permanent magnet part 120), so that after assembly, the air gap size between the magnetic conduction part 130 and the stator assembly 200 is smaller than the air gap between the permanent magnet part 120 and the stator assembly 200, so as to further increase the inductance difference between the d-axis and the q-axis, increase the asymmetry between the d-axis and the q-axis, and thus increase the reluctance torque. At the same time, due to the low machining accuracy of the permanent magnet parts 120 such as magnetic steel, adopting this kind of structural setting can ensure the flatness accuracy of the whole rotor assembly 100 and avoid scratching.

[0064] Furthermore, in the axial direction of the rotor disk, both the magnetic conduction part 130 and the permanent magnet part 120 protrude and are exposed outside the injection molded housing 140 on the side facing away from the base fixing part, so as to reduce the machining accuracy of the injection molded housing 140 and avoid affecting the air gap between the stator assembly 200 and the rotor assembly 100.

[0065] In the circumferential direction of the rotor disk, the permanent magnet part 120 and the magnetic conduction part 130 can be arranged in a fitting manner or at intervals. Preferably, arranging the permanent magnet part 120 and the magnetic conduction part 130 at intervals can reduce losses.

[0066] Combined with Figure 7 , the base fixing part includes an annular part 110 and a retaining ring part 150. The annular part 110 is an annular plate-like structure. The magnetic conduction part 130 and the permanent magnet part 120 are alternately arranged on the end face of the annular part 110. The inner circle (annular inner hole 111) of the annular part 110 is used for the transmission shaft to pass through and extends along the axial direction of the annular part 110, and is used for abutting and limiting each magnetic conduction part 130 and permanent magnet part 120, that is, for abutting and limiting the outer ring of the rotor disk to limit the radial displacement of the magnetic conduction part 130 and the permanent magnet part 120. The injection molded housing 140 is injection molded on the (partial) surfaces of the annular part 110, the magnetic conduction part 130 and the permanent magnet part 120, and can be filled in the uneven parts between the annular part 110 and the rotor disk, improving the flatness of the rotor assembly 100 and having reliable fixation.

[0067] Specifically, when the rotor disk is only disposed on one end face of the annular portion 110, the retaining ring portion 150 can extend only towards the end of the annular portion 110 where the rotor disk is disposed, so as to abut and limit the magnetic conduction portion 130 and the permanent magnetic portion 120 near the outer ring of the annular portion 110; when the rotor disk is disposed on both end faces of the annular portion 110, the retaining ring portion 150 extends towards both ends in the axial direction of the annular portion 110, so as to simultaneously abut and limit the magnetic conduction portion 130 and the permanent magnetic portion 120 located at both ends of the annular portion 110.

[0068] In order to facilitate the positioning and cooperation between the retaining ring portion 150 and the permanent magnetic portion 120 (and the magnetic conduction portion 130), when the retaining ring portion 150 is an annular structure, the end of the permanent magnetic portion 120 (and the magnetic conduction portion 130) facing the retaining ring portion 150 is a curved surface structure that closely fits the inner wall of the retaining ring portion 150, or, if the end of the permanent magnetic portion 120 (and the magnetic conduction portion 130) facing the retaining ring portion 150 is a flat surface structure, a positioning surface for cooperating with the permanent magnetic portion 120 (and the magnetic conduction portion 130) is provided on the side wall of the retaining ring portion 150 facing the permanent magnetic portion 120.

[0069] It is defined that the injection molded housing 140 includes two parts, a first housing and a second housing. The first housing and the second housing are respectively disposed on both side end faces of the annular portion 110, and the first housing and the second housing are connected and integrally injection molded. While the first housing and the second housing press the permanent magnetic portion 120 and the magnetic conduction portion 130, they can be mutually tightened through the connection of the first housing and the second housing, improving the reliability of fixation.

[0070] Specifically, in order to achieve the reliable connection between the first housing and the second housing, an injection hole is provided on the annular portion 110, and the first housing and the second housing are injection connected at the injection hole. By the method of opening a hole and injecting on the annular portion 110, the first housing and the second housing can be tightened on both sides and the rotor disk can be axially fixed, and all processing can be completed only with a milling cutter without machining the side, and the process is simple.

[0071] In a specific embodiment disclosed in the present invention, in combination with Figure 4 and Figure 6 , the injection hole includes a first injection hole 113 and a second injection hole 112. The first injection hole 113 is plural. The magnetic conduction portion 130 and the permanent magnetic portion 120 are arranged at intervals. The first injection hole 113 is located between the magnetic conduction portion 130 and the permanent magnetic portion 120 to avoid the positions where the magnetic conduction portion 130 and the permanent magnetic portion 120 are located and does not affect the injection molding of the injection molded housing 140. The second injection hole 112 is plural, and the second injection hole 112 is closer to the inner ring (annular inner hole 111) of the annular portion 110 than the rotor disk.

[0072] Among them, both the first injection hole 113 and the second injection hole 112 are circumferentially and uniformly arranged around the center of the annular portion 110.

[0073] In combination withFigure 7 The positions where the first injection hole 113 and the second injection hole 112 are arranged are both close to the positions where the magnetic conduction part 130 and the permanent magnet part 120 are located, and can cooperate with the retaining ring part 150 to achieve the circumferential surrounding of each magnetic conduction part 130 and permanent magnet part 120 in four directions, ensuring the fixing effect on each magnetic conduction part 130 and permanent magnet part 120.

[0074] In one embodiment, combined with Figure 7 The first housing and the second housing both extend to and are connected to the outer peripheral side wall of the retaining ring part 150 facing away from the annular part 110, that is, the outer diameter of the injection-molded housing 140 is larger than the outer diameter of the retaining ring part 150, and the injection-molded housing 140 is in close fit with the outer wall of the retaining ring part 150. The first housing and the second housing are connected as a whole at the outer peripheral side wall of the retaining ring part 150, thereby strengthening the bonding strength of the first housing and the second housing in the axial direction.

[0075] Correspondingly, combined with Figure 8 The first housing and the second housing both include an injection-molded inner ring 141, a transition part, and an injection-molded outer ring 142. The injection-molded inner rings 141 of the first housing and the second housing are both connected to the injection-molded outer ring 142 through the transition part, and the injection-molded inner ring 141 of the first housing and the injection-molded inner ring 141 of the second housing are connected through the first injection connection part 143. The transition part of the first housing and the transition part of the second housing are connected through the second injection connection part 144. The injection-molded outer rings 142 of the first housing and the second housing both extend to and are connected to the outer peripheral side wall of the retaining ring part 150. Among them, the first injection connection part 143 passes through the first injection hole 113, the second injection connection part 144 passes through the second injection hole 112, and both the first injection connection part 143 and the second injection connection part 144 are integrally injection-molded with the injection-molded housing 140.

[0076] Define the inner hole of the annular part 110 as the annular inner hole 111. The injection-molded housing 140 is integrally annular in structure and is concentrically arranged with the annular part 110. The inner diameter of the injection-molded housing 140 (injection-molded inner ring 141) is larger than the aperture of the annular inner hole 111, so that an installation space for installing a transmission shaft can be reserved at the inner ring position of the annular part 110.

[0077] The annular part 110 and the retaining ring part 150 can be set as an integral structure or a split structure, and the magnetic conduction part 130 and the annular part 110 can be set as an integral structure or a split structure. Define the magnetic conduction part 130, the annular part 110, and the retaining ring part 150 as the rotor core of the rotor assembly 100. When the magnetic conduction part 130, the annular part 110, and the retaining ring part 150 are of an integral structure, that is, when the rotor core is integrally formed, the structural strength and stiffness of the rotor assembly 100 can be improved. At this time, the rotor core can be prepared from magnetic conduction materials such as silicon steel sheets, steel, and SMC (soft magnetic composite materials), so that the rotor assembly 100 can operate at a higher speed and improve the power density of the motor.

[0078] When the magnetic conduction part 130 and the annular part 110 are of a split structure, the magnetic conduction part 130 is still prepared from a magnetic conductive material, and the annular part 110 can be prepared from high-strength materials such as steel and carbon fiber.

[0079] It should be noted that for the double-rotor single-stator structure, the basic fixing part may not be provided either. In this case, the magnetic conduction part 130 and the permanent magnet part 120 can be directly fixed into an integral rotor disc structure by injection molding. For the single-stator single-rotor and single-stator double-rotor structures, the basic fixing part (annular part 110) made of a magnetic conductive material cannot be cancelled to form a complete magnetic circuit.

[0080] The disc motor disclosed in the embodiments of the present invention includes the above-mentioned rotor assembly 100, so it also has the structures and beneficial effects of the above embodiments, which will not be elaborated here.

[0081] In one embodiment, in combination with Figure 1 and Figure 2 , the disc motor includes the above-mentioned rotor assembly 100 and stator assembly 200. The stator assembly 200 adopts an existing structure, and the numbers of the rotor assembly 100 and the stator assembly 200 are arranged according to actual needs, and configurations of double-stator single-rotor, single-stator single-rotor, and single-stator double-rotor can be formed.

[0082] 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. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Specific technical means in some embodiments can be partially or wholly incorporated into another embodiment on the premise that they are not explicitly excluded by another embodiment. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotor assembly, characterized in that, Including: A plurality of magnetic conduction parts (130), which are made of magnetic conduction materials; A plurality of permanent magnet parts (120), which are made of permanent magnet materials, and the permanent magnet parts (120) and the magnetic conduction parts (130) are alternately arranged to form a rotor disc with an annular structure; A connecting part for connecting the magnetic conduction part (130) and the permanent magnet part (120).

2. The rotor assembly according to claim 1, wherein, The connecting part includes: A basic fixing part, and both the magnetic conduction part (130) and the permanent magnet part (120) are arranged on the end face of the basic fixing part; An injection molding housing (140), which is arranged on the basic fixing part and is used to press the magnetic conduction part (130) and the permanent magnet part (120) onto the basic fixing part.

3. The rotor assembly according to claim 2, wherein, The magnetic conduction part (130) extends along the radial direction of the rotor disc, and the two side edges facing away from the basic fixing part are provided with a first inclined surface structure (131), and the first inclined surface structure (131) is used to avoid the concentration of magnetic lines of force.

4. The rotor assembly according to claim 2, wherein, The permanent magnet part (120) extends along the radial direction of the rotor disc, and the two side edges facing away from the basic fixing part are provided with a second inclined surface structure (121), and the second inclined surface structure (121) is used for the injection molding housing (140) to press.

5. The rotor assembly according to claim 2, characterized in that, Axially along the rotor disc, the extending length of the magnetic conduction part (130) is greater than the extending length of the permanent magnet part (120); and / or, Axially along the rotor disc, one side of the magnetic conduction part (130) and the permanent magnet part (120) facing away from the basic fixing part protrudes from the injection molding housing (140).

6. The rotor assembly according to claim 2, characterized in that, The basic fixing part includes: An annular part (110), which is an annular plate-like structure, both the magnetic conduction part (130) and the permanent magnet part (120) are arranged on the end face of the annular part (110), and the injection molding housing (140) is arranged on the surface of the annular part (110); A retaining ring part (150), which is arranged on the outer ring of the annular part (110) and extends along the axial direction of the annular part (110) for abutting and limiting each of the magnetic conduction parts (130) and the permanent magnet parts (120).

7. The rotor assembly according to claim 6, characterized in that, The injection molding housing (140) includes a first housing and a second housing, and the first housing and the second housing are respectively arranged on the two end faces of the annular part (110); An injection molding hole is formed in the annular part (110), and the first housing and the second housing are injection-connected at the injection molding hole, and / or, both the first housing and the second housing extend to the side wall of the retaining ring part (150) facing away from the annular part (110) and are connected.

8. The rotor assembly according to claim 7, wherein, The injection molding hole includes: A plurality of first injection molding holes (113), the magnetic conduction parts (130) and the permanent magnet parts (120) are arranged at intervals, and the first injection molding holes (113) are located between the magnetic conduction parts (130) and the permanent magnet parts (120); A plurality of second injection molding holes (112), and the second injection molding holes (112) are closer to the annular inner hole (111) of the annular part (110) than the rotor disc.

9. The rotor assembly according to claim 7, characterized in that, The annular part (110) and the retaining ring part (150) are of an integral structure or a split structure; and / or, The magnetic conduction part (130) and the annular part (110) are of an integral structure or a split structure.

10. The rotor assembly according to claim 6, wherein, One end of the permanent magnet part (120) facing the retaining ring part (150) is a curved surface structure that closely fits the side wall of the retaining ring part (150); or, The side wall of the retaining ring part (150) facing the permanent magnet part (120) is provided with a positioning surface for cooperating with the permanent magnet part (120).

11. The rotor assembly according to claim 1, wherein, The connecting part is an injection molded housing (140), and the injection molded housing (140) is used to injection mold the magnetic conduction part (130) and the permanent magnet part (120) into an integral structure.

12. A disc motor, characterized in that, It includes the rotor assembly (100) according to any one of claims 1 to 11.

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