Rotor assembly for an axial motor and axial motor

Abstract

The application discloses a rotor assembly for an axial motor and an axial motor, the rotor assembly for the axial motor comprising: a rotor disc, the rotor disc being provided with a mounting hole penetrating through the rotor disc, the mounting hole comprising a first opening and a second opening located on both sides of the axial direction of the rotor disc and being in communication with each other, projections of the first opening and the second opening in a plane perpendicular to the axis of the rotor disc at least partially not overlapping; and a plurality of magnetic steel sheets, the plurality of magnetic steel sheets being stacked along the radial direction of the rotor disc and being inserted into the mounting hole. According to the rotor assembly for the axial motor, the magnetic steel sheets can be fixed reliably, the structure is simple, the rotor assembly is convenient to process and assemble, and the rotor assembly occupies a small space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, and more particularly, to a rotor assembly for an axial electric machine and an axial electric machine. BACKGROUND

[0002] In some related technologies, the fixing of the magnetic steel on the rotor disc is realized through adhesion. The fixing of the magnetic steel by adhesion is unreliable, and the magnetic steel is prone to falling off when the rotor assembly rotates at high speed. In some other related technologies, the magnetic steel is fixed on the rotor disc through a fixing structure such as a support frame. The fixing structure is complex in structure and requires high machining precision, which makes the overall structure of the rotor assembly complex, increases the weight of the rotor assembly, increases the process difficulty of assembly, and increases the production cost. SUMMARY

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a rotor assembly for an axial electric machine, which can ensure reliable fixing of the magnetic steel sheet and is simple in structure, easy to process and assemble, and small in space occupation.

[0004] Another object of the present application is to provide an axial electric machine having the above rotor assembly.

[0005] The rotor assembly for an axial electric machine according to an embodiment of the present application comprises: a rotor disc, the rotor disc being provided with a mounting hole penetrating the rotor disc, the mounting hole comprising a first opening and a second opening located on both sides of the axial direction of the rotor disc and communicating with each other, projections of the first opening and the second opening in a plane perpendicular to the axis of the rotor disc at least partially not overlapping; and a plurality of magnetic steel sheets, the plurality of magnetic steel sheets being stacked along the radial direction of the rotor disc and inserted into the mounting hole.

[0006] The rotor assembly for an axial electric machine according to an embodiment of the present application, by the mounting hole comprising a first opening and a second opening located on both sides of the axial direction of the rotor disc and communicating with each other, projections of the first opening and the second opening in a plane perpendicular to the axis of the rotor disc at least partially not overlapping, so that the magnetic steel sheet can be inserted obliquely into the mounting hole, and the inner wall of the mounting hole can stop the magnetic steel sheet when the rotor assembly rotates at high speed, so that the rotor disc can support the magnetic steel sheet in the axial direction of the rotor disc, ensuring reliable fixing of the magnetic steel sheet on the rotor disc, preventing the magnetic steel sheet from falling off, and eliminating the fixing structure for fixing the magnetic steel in the related art, so that the structure of the rotor assembly is simple, the processing and assembly of the rotor assembly are facilitated, the overall space occupation of the rotor assembly is reduced, the reliability of the rotor assembly is improved, and the reliable operation of the axial electric machine is ensured.

[0007] In addition, the rotor assembly for an axial motor according to the above-mentioned embodiments of the present application can further have the following additional technical features.

[0008] According to some embodiments of the present application, the rotor assembly for an axial motor, the projection of the first opening and the second opening in a plane perpendicular to the rotor disc axis is completely non-overlapping.

[0009] According to some embodiments of the present application, in the radial direction of the rotor disc, at least one of the outer surface of the magnetic steel sheet at the radially outer end and the inner surface of the magnetic steel sheet at the radially inner end is arc-shaped in projection in a plane perpendicular to the rotor disc axis, and the center of the circle on which the arc-shaped surface lies is located on the axis of the rotor disc.

[0010] According to some embodiments of the present application, in the direction radially inward of the rotor disc, the width of the mounting hole in the circumferential direction of the rotor disc gradually decreases in any cross section perpendicular to the axial direction of the rotor disc.

[0011] According to some embodiments of the present application, in the direction radially inward of the rotor disc, the width of the two adjacent magnetic steel sheets in the circumferential direction of the rotor disc gradually decreases in any cross section perpendicular to the axial direction of the rotor disc.

[0012] According to some embodiments of the present application, the surface size and shape of the two adjacent magnetic steel sheets facing each other are the same and fit.

[0013] According to some embodiments of the present application, in the circumferential direction of the rotor disc, the two ends of the magnetic steel sheet located radially inward of the rotor disc of the two adjacent magnetic steel sheets are both inwardly recessed relative to the two ends of the magnetic steel sheet located radially outward of the rotor disc.

[0014] According to some embodiments of the present application, the two end faces of the plurality of magnetic steel sheets in the axial direction of the rotor disc are flush with the two end faces in the axial direction of the rotor disc, respectively.

[0015] According to some embodiments of the present application, the two adjacent magnetic steel sheets are connected by an adhesive.

[0016] According to some embodiments of the present application, the projection of the magnetic steel sheet in any plane perpendicular to the radial direction in which the magnetic steel sheet is located is a parallelogram.

[0017] According to some embodiments of the present application, the outer surface of the plurality of magnetic steel sheets corresponding to the inner wall of the mounting hole is connected to the inner wall of the mounting hole by an adhesive.

[0018] According to some embodiments of the present application, the mounting holes are multiple, the multiple mounting holes are spaced apart along the circumferential direction of the rotor disc, and multiple magnetic steel sheets are inserted into the multiple mounting holes.

[0019] The axial motor according to an embodiment of the present application comprises the rotor assembly for an axial motor according to an embodiment of the present application.

[0020] The axial motor according to an embodiment of the present application, by the mounting hole comprising the first opening and the second opening located on both sides of the axial direction of the rotor disc and communicating with each other, the projections of the first opening and the second opening in the plane perpendicular to the axis of the rotor disc at least partially do not overlap, so that the magnetic steel sheet can be obliquely inserted into the mounting hole, and the inner wall of the mounting hole can stop the magnetic steel sheet when the rotor assembly rotates at high speed, so that the rotor disc can support the magnetic steel sheet in the axial direction of the rotor disc, ensure that the magnetic steel sheet is fixed on the rotor disc reliably, prevent the magnetic steel sheet from falling off, and eliminate the fixing structure for fixing the magnetic steel in the related art, so that the structure of the rotor assembly is simple, the processing and assembly of the rotor assembly are facilitated, the overall occupied space of the rotor assembly is reduced, the reliability of the rotor assembly is improved, and the reliable operation of the axial motor is ensured.

[0021] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings, wherein:

[0023] Figure 1 is a schematic view of a partial structure of a rotor assembly according to an embodiment of the present application;

[0024] Figure 2 is a sectional view of a partial structure of a rotor assembly according to an embodiment of the present application;

[0025] Figure 3 is a front view of a rotor disc of a rotor assembly according to an embodiment of the present application;

[0026] Figure 4 is a schematic view of a structure of a rotor disc of a rotor assembly according to an embodiment of the present application;

[0027] Figure 5 is a schematic view of a structure of a magnetic steel of a rotor assembly according to an embodiment of the present application;

[0028] Figure 6 is a front view of a magnetic steel of a rotor assembly according to an embodiment of the present application;

[0029] Figure 7is a top view of a magnetic steel of a rotor assembly according to an embodiment of the present application.

[0030] Reference Signs:

[0031] 100, rotor assembly;

[0032] 10, rotor disc; 11, mounting hole; 111, first opening; 112, second opening;

[0033] 20, magnetic steel; 21, magnetic steel sheet;

[0034] 30, gap. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are for the purpose of explanation only, and should not be understood as limiting the present application.

[0036] In the description of the present application, "a first feature" and "a second feature" can include one or more of the features, the meaning of "a plurality of" is two or more, and "above" or "below" the second feature of the first feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature therebetween, "above", "over" and "on" the second feature of the first feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in terms of horizontal height.

[0037] A rotor assembly 100 for an axial motor according to an embodiment of the present application is described below with reference to the accompanying drawings.

[0038] Referring to Figures 1-4 As shown, the rotor assembly 100 for an axial motor according to an embodiment of the present application can include a rotor disc 10 and a plurality (equal to or more than two) of magnetic steel sheets 21.

[0039] Specifically, the rotor disc 10 is provided with a mounting hole 11 penetrating through the rotor disc 10, and the plurality of magnetic steel sheets 21 are stacked in the radial direction of the rotor disc 10 and inserted into the mounting hole 11, thereby assembling the rotor assembly 100, and the magnetic steel sheets 21 can reduce eddy current loss of the magnetic steel sheets 21 by being divided into blocks, thereby reducing the heat generation of the axial motor and improving the working efficiency of the axial motor. The rotor assembly 100 is used for an axial motor, which has the advantages of small size, light weight, high efficiency, compact structure and short axial length, and is beneficial to reducing the occupied space. The axial motor is an axial flux motor. For example, the magnetic steel sheet 21 can be like Figure 6The image shows twelve magnetic steel sheets 21.

[0040] In some related technologies, magnets are fixed to the rotor disk by bonding. However, bonding is an unreliable method for fixing magnets, and magnets are prone to falling off when the rotor assembly rotates at high speed. In other related technologies, magnets are fixed to the rotor disk by support frames or other fixing structures. These fixing structures are complex and require high machining precision, which makes the overall structure of the rotor assembly complex, increases the weight of the rotor assembly, increases the difficulty of assembly, and raises production costs.

[0041] Therefore, in this invention, as Figure 2 , Figure 4 , Figure 5 and Figure 7 As shown, the mounting hole 11 includes a first opening 111 and a second opening 112, the first opening 111 and the second opening 112 being located in the axial direction of the rotor disk 10 (e.g., Figure 1 The first opening 111 and the second opening 112 are connected to each other in the front and back directions shown in the figure. The projections of the first opening 111 and the second opening 112 in the plane perpendicular to the axis of the rotor disk 10 do not overlap at least partially, so that the magnet 21 can be obliquely inserted into the mounting hole 11 through the first opening 111 or the second opening 112. The magnet 21 can be fixed and limited through the mounting hole 11.

[0042] Since the magnetization direction of the magnet 21 is parallel to the axial direction of the rotor disk 10, when the rotor assembly 100 rotates at high speed, the magnet 21 will be subjected to a force along the axial direction of the rotor disk 10. Through the assembly method of the magnet 21 being obliquely inserted into the mounting hole 11, the inner wall of the mounting hole 11 can abut the magnet 21, allowing the rotor disk 10 to provide a certain degree of support for the magnet 21 along the axial direction of the rotor disk 10. This prevents the magnet 21 from shifting along the axial direction of the rotor disk 10, ensuring that the magnet 21 is reliably fixed on the rotor disk 10, preventing the magnet 21 from falling off, improving the reliability of the rotor assembly 100, and ensuring the reliable operation of the axial motor. At the same time, it eliminates the need for a fixing structure for the magnet in related technologies, simplifying the fixing method of the magnet 21, making the structure of the rotor assembly 100 simple, facilitating the processing and assembly of the rotor assembly 100, reducing the overall space occupied by the rotor assembly 100, and lowering production costs.

[0043] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0044] In some embodiments, the rotor disc 10 can be formed by steel machining addition, which is simple in structure and convenient for processing and manufacturing; or the rotor disc 10 can be formed by stacking and welding silicon steel sheets, which can ensure good performance of the rotor disc 10, thereby improving the working performance of the axial motor. For example, the rotor disc 10 can be formed by magnetically conductive structural steel machining.

[0045] In some embodiments, the rotor disc 10 is a magnetic conductive member, so that the magnetic field generated by the magnetic steel sheet 21 can pass through the rotor disc 10 in the axial direction of the rotor disc 10, ensuring reliable operation of the rotor assembly 100.

[0046] According to the rotor assembly 100 of the embodiment of the present application, the mounting hole 11 includes the first opening 111 and the second opening 112 located on both sides of the axial direction of the rotor disc 10 and communicating with each other, and the projections of the first opening 111 and the second opening 112 in the plane perpendicular to the axis of the rotor disc 10 at least partially do not overlap, so that the magnetic steel sheet 21 can be inserted obliquely into the mounting hole 11. When the rotor assembly 100 rotates at high speed, the inner wall of the mounting hole 11 can stop the magnetic steel sheet 21, so that the rotor disc 10 can support the magnetic steel sheet 21 in the axial direction of the rotor disc 10, ensuring reliable fixation of the magnetic steel sheet 21 on the rotor disc 10, preventing the magnetic steel sheet 21 from falling off, and eliminating the need for the fixing structure for fixing the magnetic steel in the related art, so that the structure of the rotor assembly 100 is simple, the processing and assembly of the rotor assembly 100 are facilitated, the overall occupied space of the rotor assembly 100 is reduced, the reliability of the rotor assembly 100 is improved, and reliable operation of the axial motor is ensured.

[0047] According to some embodiments of the present application, as shown in Figure 2 The projections of the first opening 111 and the second opening 112 in the plane perpendicular to the axis of the rotor disc 10 do not overlap at all, so that the contact area between the inner wall of the mounting hole 11 and the magnetic steel sheet 21 is larger, the stopping effect is better, the fixation of the magnetic steel sheet 21 in the mounting hole 11 is more reliable, and the magnetic steel sheet 21 is effectively prevented from falling off.

[0048] In some embodiments of the present application, as shown in Figure 6As shown, in the radial direction of the rotor disc 10, at least one of the outer surface of the magnetic steel sheet 21 at the radially outer end and the inner surface of the magnetic steel sheet 21 at the radially inner end is projected in the plane perpendicular to the axis of the rotor disc 10 as an arc, and the center of the circle where the arc is located is located on the axis of the rotor disc 10, which can improve the effective area of the magnetic steel sheet 21, ensure the reliable operation of the axial motor, and be beneficial to improve the working efficiency and performance of the axial motor. In other words, the outer surface of the magnetic steel sheet 21 at the radially outer end and the inner surface of the magnetic steel sheet 21 at the radially inner end are both projected in the plane perpendicular to the axis of the rotor disc 10 as an arc, or one of them is projected as an arc, which can both improve the effective area of the magnetic steel sheet 21. For example, the effective area of the plurality of magnetic steel sheets 21 can be like the area of the sector as shown in Figure 6 .

[0049] It can be understood that the radially outer end refers to the end away from the axis of the rotor disc 10 in the radial direction of the rotor disc 10, and the radially inner end refers to the end close to the axis of the rotor disc 10 in the radial direction of the rotor disc 10.

[0050] According to some embodiments of the present application, as shown in Figure 1 and Figure 2 , in the direction radially inward of the rotor disc 10, the width of the mounting hole 11 in the circumferential direction of the rotor disc 10 gradually decreases in any cross section perpendicular to the axial direction of the rotor disc 10, which can meet the shape requirements of the magnetic steel sheet 21 cooperating with the mounting hole 11, and be beneficial to ensure the effective area of the magnetic steel sheet 21.

[0051] In some embodiments, as shown in Figure 1 , Figure 2 , Figure 5 and Figure 6 , in the direction radially inward of the rotor disc 10, the width of the adjacent two magnetic steel sheets 21 in the circumferential direction of the rotor disc 10 gradually decreases in any cross section perpendicular to the axial direction of the rotor disc 10, which can meet the shape requirements of the plurality of magnetic steel sheets 21, ensure the effective area of the plurality of magnetic steel sheets 21, avoid reducing the effective area of the plurality of magnetic steel sheets 21, thereby avoiding weakening the torque performance of the axial motor, and ensuring the working performance of the axial motor.

[0052] In some embodiments of the present application, as shown in Figure 1 and Figure 2 , the two end faces of the plurality of magnetic steel sheets 21 in the axial direction of the rotor disc 10 are flush with the two end faces in the axial direction of the rotor disc 10, which avoids the magnetic steel sheet 21 protruding from the two end faces in the axial direction of the rotor disc 10, ensures the normal operation of the rotor assembly 100, and makes the operation of the axial motor reliable.

[0053] In some embodiments, the axial motor comprises a stator assembly, and the rotor assembly 100 has an air gap with the stator assembly. The two end faces of the plurality of magnetic steel sheets 21 in the axial direction of the rotor disc 10 are flush with the two end faces of the rotor disc 10, respectively, so that the air gap distance between the rotor assembly 100 and the stator assembly is the same, ensuring the working performance of the axial motor, and making the working of the axial motor more reliable.

[0054] In some specific embodiments, as shown in Figure 6 the outer surface of the magnetic steel sheet 21 at the radially outer end and the inner surface of the magnetic steel sheet 21 at the radially inner end are both arc-shaped in the projection in the plane perpendicular to the axis of the rotor disc 10 in the radial direction of the rotor disc 10. When the plurality of magnetic steel sheets 21 are assembled, the magnetic steel sheet 21 at the radially outer end and the magnetic steel sheet 21 at the radially inner end are inserted first, and then the magnetic steel sheet 21 between the two magnetic steel sheets 21 at the radially outer end and the radially inner end is inserted, so that the installation of the magnetic steel sheet 21 is more convenient, and the assembly efficiency of the rotor assembly 100 is improved.

[0055] In some embodiments of the present application, as shown in Figure 1 , Figure 2 , Figure 5 and Figure 6 the surface size and shape of the two adjacent magnetic steel sheets 21 facing each other are the same and fit, so that the outer wall surface of the plurality of stacked magnetic steel sheets 21 corresponding to the inner wall of the mounting hole 11 is smooth, the insertion of the magnetic steel sheet 21 into the mounting hole 11 is more convenient, the fixation of the magnetic steel sheet 21 is reliable, the normal working of the rotor assembly 100 is ensured, and the normal operation of the axial motor is ensured.

[0056] According to some embodiments of the present application, in the circumferential direction of the rotor disc 10, in the two adjacent magnetic steel sheets 21, the two ends of the magnetic steel sheet 21 at the radially inner side of the rotor disc 10 are both inwardly recessed relative to the two ends of the magnetic steel sheet 21 at the radially outer side of the rotor disc 10, which can meet the different structural requirements of the plurality of magnetic steel sheets 21; the magnetic steel sheet 21 has the same size in the thickness direction, which facilitates the processing and manufacturing of the magnetic steel sheet 21, improves the production efficiency, and reduces the production cost; and the outer wall surface of the stacked magnetic steel sheet 21 corresponding to the inner wall of the mounting hole 11 is not smooth, which can increase the bonding force between the outer wall surface and the inner wall of the mounting hole 11 through the adhesive.

[0057] According to some embodiments of the present application, the two adjacent magnetic steel sheets 21 can be connected through the adhesive, so that the plurality of magnetic steel sheets 21 can be bonded as a whole through the adhesive, ensuring the reliable connection of the plurality of magnetic steel sheets 21, the magnetic steel sheets 21 are not easy to separate, and the normal working of the rotor assembly 100 is ensured. For example, the adhesive can be magnetic steel adhesive.

[0058] In some embodiments, along the circumferential direction of the rotor disc 10, in two adjacent magnetic steel sheets 21, the two ends of the magnetic steel sheet 21 located on the radially inner side of the rotor disc 10 are both inwardly recessed relative to the two ends of the magnetic steel sheet 21 located on the radially outer side of the rotor disc 10, which can increase the contact area of the magnetic steel sheet 21 with the adhesive, so that the connection of the plurality of magnetic steel sheets 21 with the adhesive is more firm, and the fixation of the plurality of magnetic steel sheets 21 is ensured to be reliable.

[0059] In some embodiments of the present application, as shown in Figure 2 With Figure 7 It is shown that the projection of the magnetic steel sheet 21 on any plane perpendicular to the radial direction in which the magnetic steel sheet 21 is located is a parallelogram, which facilitates the processing and manufacturing of the magnetic steel sheet 21, can ensure the effective area of the magnetic steel sheet 21, and can ensure that the magnetic steel sheet 21 is fixed reliably in the mounting hole 11. The rotor disc 10 can provide certain support to the magnetic steel sheet 21 along the axial direction of the rotor disc 10, avoiding the magnetic steel sheet 21 from moving along the axial direction of the rotor disc 10, ensuring that the magnetic steel sheet 21 is fixed reliably on the rotor disc 10, and preventing the magnetic steel sheet 21 from falling off. For example, the projection of the magnetic steel sheet 21 on any plane perpendicular to the radial direction in which the magnetic steel sheet 21 is located is a rhombus.

[0060] According to some embodiments of the present application, the outer surface of the plurality of magnetic steel sheets 21 corresponding to the inner wall of the mounting hole 11 is connected with the inner wall of the mounting hole 11 through the adhesive, which can further improve the fixation effect of the magnetic steel sheet 21, ensure the fixation of the magnetic steel sheet 21 to be reliable, and ensure the normal operation of the rotor assembly 100.

[0061] In some embodiments, as shown in Figure 1 , Figure 2 , Figure 5 With Figure 6 It is shown that the projection of the magnetic steel sheet 21 on any plane perpendicular to the radial direction in which the magnetic steel sheet 21 is located is a parallelogram, which facilitates the processing and manufacturing of the magnetic steel sheet 21, can ensure the effective area of the magnetic steel sheet 21, and can ensure that the magnetic steel sheet 21 is fixed reliably in the mounting hole 11. The rotor disc 10 can provide certain support to the magnetic steel sheet 21 along the axial direction of the rotor disc 10, avoiding the magnetic steel sheet 21 from moving along the axial direction of the rotor disc 10, ensuring that the magnetic steel sheet 21 is fixed reliably on the rotor disc 10, and preventing the magnetic steel sheet 21 from falling off. For example, the projection of the magnetic steel sheet 21 on any plane perpendicular to the radial direction in which the magnetic steel sheet 21 is located is a rhombus.

[0062] In some embodiments, as shown in Figure 2As shown, the outer surface of the plurality of magnetic steel sheets 21 and the inner wall of the mounting hole 11 have a gap 30, which facilitates the insertion of the magnetic steel sheet 21 into the mounting hole 11, making the installation of the magnetic steel sheet 21 more convenient, and the adhesive can fill the gap 30, ensuring that the magnetic steel sheet 21 is reliably connected in the mounting hole 11, effectively improving the fixing effect of the magnetic steel sheet 21, and ensuring the normal operation of the rotor assembly 100. For example, the magnetic steel sheet 21 and the rotor disc 10 can be formed as a whole through the glue injection process.

[0063] In some embodiments of the present application, as Figure 3 With Figure 4 As shown, the mounting hole 11 can be multiple (greater than or equal to two), and the plurality of mounting holes 11 are spaced apart along the circumferential direction of the rotor disc 10, and a plurality of magnetic steel sheets 21 are inserted into the plurality of mounting holes 11, which can install the magnetic steel sheet 21 in the mounting hole 11, realize the assembly of the rotor assembly 100, and ensure the normal operation of the axial motor, and ensure better working performance.

[0064] The axial motor according to the embodiment of the present application comprises the rotor assembly 100 for the axial motor according to the embodiment of the present application. Since the rotor assembly 100 according to the embodiment of the present application has the above beneficial technical effects, the axial motor according to the embodiment of the present application, by the mounting hole 11 comprising the first opening 111 and the second opening 112 located on both sides of the axial direction of the rotor disc 10 and communicating with each other, the projection of the first opening 111 and the second opening 112 in the plane perpendicular to the axis of the rotor disc 10 at least partially does not overlap, so that the magnetic steel sheet 21 can be inserted obliquely into the mounting hole 11. When the rotor assembly 100 rotates at high speed, the inner wall of the mounting hole 11 can stop the magnetic steel sheet 21, so that the rotor disc 10 can play a certain supporting role on the magnetic steel sheet 21 along the axial direction of the rotor disc 10, ensuring that the magnetic steel sheet 21 is reliably fixed on the rotor disc 10, preventing the magnetic steel sheet 21 from falling off, and eliminating the fixing structure for fixing the magnetic steel in the related art, so that the structure of the rotor assembly 100 is simple, the processing and assembly of the rotor assembly 100 are facilitated, the overall occupied space of the rotor assembly 100 is reduced, the reliability of the rotor assembly 100 is improved, and the reliable operation of the axial motor is ensured.

[0065] The rotor assembly 100 according to the embodiment of the present application and the other components and operation of the axial motor are known to those skilled in the art, and will not be described in detail here.

[0066] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0067] In the description of the present application, the description of the terms "embodiment", "specific embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0068] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotor assembly for an axial motor, characterized by, The rotor assembly comprises: a rotor disc provided with a mounting hole penetrating through the rotor disc, the mounting hole comprising a first opening and a second opening located on both sides of the axial direction of the rotor disc and communicating with each other, projections of the first opening and the second opening in a plane perpendicular to the axis of the rotor disc at least partially do not overlap; and a plurality of magnetic steel sheets, the plurality of magnetic steel sheets are stacked along the radial direction of the rotor disc and inserted into the mounting hole, projections of the magnetic steel sheets in any plane perpendicular to the radial direction in which the magnetic steel sheets are located are all parallelogram.

2. A rotor assembly for an axial motor according to claim 1, characterized in that, The projections of the first opening and the second opening in the plane perpendicular to the axis of the rotor disc do not overlap at all.

3. A rotor assembly for an axial motor according to claim 1, characterized in that, In the radial direction of the rotor disc, at least one of the outer surface of the magnetic steel sheet located at the radially outer end and the inner surface of the magnetic steel sheet located at the radially inner end has a projection in a plane perpendicular to the axis of the rotor disc in the form of an arc, and the center of the circle on which the arc lies is located on the axis of the rotor disc.

4. The rotor assembly for an axial motor of claim 1, wherein, In the direction radially inward of the rotor disc, the width of the mounting hole in the circumferential direction of the rotor disc gradually decreases in any cross section perpendicular to the axial direction of the rotor disc.

5. The rotor assembly for an axial motor of claim 1, wherein, In the direction radially inward of the rotor disc, the width of the two adjacent magnetic steel sheets in the circumferential direction of the rotor disc gradually decreases in any cross section perpendicular to the axial direction of the rotor disc.

6. The rotor assembly for an axial motor of claim 1, wherein, The surface size and shape of the two adjacent magnetic steel sheets facing each other are the same and fit together.

7. The rotor assembly for an axial motor of claim 1, wherein, In the circumferential direction of the rotor disc, both ends of the magnetic steel sheet located radially inward of the rotor disc among the two adjacent magnetic steel sheets are inwardly recessed relative to both ends of the magnetic steel sheet located radially outward of the rotor disc.

8. The rotor assembly for an axial motor of claim 1, wherein, Both end faces of the plurality of magnetic steel sheets in the axial direction of the rotor disc are flush with both end faces in the axial direction of the rotor disc, respectively.

9. The rotor assembly for an axial motor of claim 1, wherein, The two adjacent magnetic steel sheets are connected by an adhesive.

10. The rotor assembly for an axial motor of claim 1, wherein, The outer surface of the plurality of magnetic steel sheets corresponding to the inner wall of the mounting hole is connected by an adhesive between the inner wall of the mounting hole.

11. A rotor assembly for an axial motor as claimed in claim 1, wherein, The mounting hole is a plurality of mounting holes, the plurality of mounting holes are spaced apart in the circumferential direction of the rotor disc, and a plurality of magnetic steel sheets are inserted into each of the plurality of mounting holes.

12. An axial motor, characterized by The rotor assembly comprises: a rotor disc provided with a mounting hole penetrating through the rotor disc, the mounting hole comprising a first opening and a second opening located on both sides of the axial direction of the rotor disc and communicating with each other, projections of the first opening and the second opening in a plane perpendicular to the axis of the rotor disc at least partially do not overlap; and a plurality of magnetic steel sheets, the plurality of magnetic steel sheets are stacked along the radial direction of the rotor disc and inserted into the mounting hole, projections of the magnetic steel sheets in any plane perpendicular to the radial direction in which the magnetic steel sheets are located are all parallelogram.

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