Rotor structure and motor

Abstract

The invention provides a rotor structure and a motor. The rotor structure comprises two groups of first rotor assemblies, each group of first rotor assemblies comprises a first rotor iron core and a first permanent magnet, the first rotor iron core and the first permanent magnet are adjacently arranged, the radial outer side of the first rotor iron core is provided with a protrusion extending in the radial direction of the first rotor iron core, and the first rotor iron core and the first permanent magnet are adjacent to each other. The first rotor core is provided with a first shaft hole through which the rotating shaft passes. The second rotor assembly comprises a second rotor iron core and second permanent magnets, the second rotor iron core is provided with a second shaft hole, a plurality of magnetic steel grooves are formed in the circumferential direction of the second rotor iron core, and one second permanent magnet is arranged in each magnetic steel groove. The two first rotor assemblies are arranged at the two ends of the second rotor assembly respectively, the second rotor iron core is arranged between the first permanent magnets of the two first rotor assemblies, and the problems that in the prior art, a multi-rotor assembly is large in assembling difficulty and low in motor reliability due to large repulsive force are solved.

Description

Technical Field

[0001] The present application relates to the technical field of permanent magnet motors, and in particular to a rotor structure and a motor. Background Art

[0002] Permanent magnet motors have the advantages of small size and high efficiency, and are widely used in air conditioners, industrial equipment, new energy vehicles and other fields. With the improvement of motor energy efficiency standards, higher requirements are put forward for the energy efficiency level of motors. For permanent magnet motors, it is necessary to further improve the efficiency and high torque density of motors. One of the main technical means to improve motor efficiency and torque density is to embed permanent magnets to obtain larger air gap magnetic density and larger magnetic flux, but due to the fixed rotor magnetic circuit structure, the energy efficiency improvement is limited; another means is to use the rotor structure to increase the motor salient pole ratio and increase the motor reluctance torque to make up for the lack of permanent magnet torque. Its efficiency can be comparable to that of permanent magnet motors, but it usually requires a larger rotor volume, which will make the motor torque density inferior to that of permanent magnet motors. For current permanent magnet motors, if we want to further achieve motor efficiency and high torque density, improving the rotor magnetic concentration effect is an effective way.

[0003] A new type of permanent magnet motor has emerged in the prior art, which improves the energy efficiency of the permanent magnet motor by combining multiple rotor components. However, its structure is complex, and there is repulsive force when assembling multiple rotor components, which leads to problems such as difficulty in assembly and low motor reliability.

[0004] The above problems have not yet been effectively solved. Summary of the invention

[0005] The main purpose of the present application is to provide a rotor structure and a motor to solve the problems of large repulsive force causing great difficulty in assembly and low motor reliability in the prior art multi-rotor assembly.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a rotor structure is provided, comprising: a first rotor assembly, the first rotor assembly is arranged in two groups, each group of the first rotor assembly comprises a first rotor core and a first permanent magnet, the first rotor core and the first permanent magnet are arranged adjacently, a radial outer side of the first rotor core is provided with a protrusion extending radially along the first rotor core, and the first rotor core is provided with a first axial hole for the shaft to pass through; a second rotor assembly, the second rotor assembly comprises a second rotor core and a second permanent magnet, the second rotor core is provided with a second axial hole, a plurality of magnetic steel slots are arranged in the circumference of the second rotor core, and a second permanent magnet is arranged in each magnetic steel slot. The two groups of the first rotor assemblies are respectively arranged at the two ends of the second rotor assembly, the second rotor core is arranged between the first permanent magnets of the two groups of the first rotor assemblies, and the first permanent magnet is arranged between the end of the second rotor assembly and the first rotor core.

[0007] Furthermore, the protrusion(s) extending radially outward along the first rotor core is / are one or more.

[0008] Furthermore, the number of protrusions 23 is a, and a / 4 is an integer.

[0009] Furthermore, when there are multiple protrusions and a projection is made on an axial end face of the rotor structure along the axial direction of the rotor structure, a line is connected between the geometric center of the protrusion or the geometric centers of adjacent protrusions and the central axis of the first rotor core, and the central angle formed between adjacent connecting lines is b. The number of pole pairs of the rotor structure is p. Among them, b / 360 / 2p = b0, and b0 is an integer.

[0010] Furthermore, b / (360 / 2p) = b0, and b0 is an odd number.

[0011] Furthermore, when a projection is made on an axial end face of the rotor structure along the axial direction of the rotor structure, the length of the line connected between the central axis of the first rotor core and any point on the outer circle of the first rotor core is c, and the length of the line connected between the central axis of the second rotor core and any point on the outer circle of the second rotor core is d. Among them, max(c) = max(d).

[0012] Furthermore, when a projection is made on an axial end face of the rotor structure along the axial direction of the rotor structure, the length of the line connected between the central axis of the first rotor core and any point on the outer circle of the first permanent magnet is e, the maximum value of the length between the central axis of the second rotor core and the end of the second permanent magnet far from the second shaft hole is f, and the length of the line connected between the central axis of the second rotor core and any point on the outer circle of the second rotor core is d. Among them, min(e) = f or max(e) ≤ max(d).

[0013] Furthermore, when there are multiple protrusions, the multiple protrusions are arranged in pairs along the circumferential direction of the first rotor core.

[0014] Furthermore, the first permanent magnet is of an integral disk structure and is divided into multiple different polarity regions according to the magnetization direction.

[0015] Furthermore, when a projection is made on an axial end face of the rotor structure along the axial direction of the rotor structure, the position of at least one pair of protrusions corresponds to the position of the magnetic pole demarcation line of adjacent polarity regions of the first permanent magnet.

[0016] Furthermore, adjacent pairs of protrusions are symmetrically arranged with respect to the center line of a polarity region of the first permanent magnet.

[0017] Furthermore, the length of the protrusion extending along the radial direction of the first rotor core is g, and the minimum thickness of the first rotor core in the axial direction is h. Among them, g ≥ 0.3*h.

[0018] Further, a projection is made on an axial end surface of the rotor structure along the axial direction of the rotor structure. The thickness of the second permanent magnet along its magnetization direction is i, and the interval width between adjacent protrusions along the tangential direction of the first rotor core is j, where j ≥ 0.25 * i.

[0019] Further, the first rotor core is provided with a limiting member, and the first permanent magnet is provided with a limiting structure, and the limiting member and the limiting structure are correspondingly arranged.

[0020] Further, there are multiple limiting members and multiple limiting structures, and the multiple limiting members and the multiple limiting structures are correspondingly arranged one by one.

[0021] Further, a boss is provided on the side of the first rotor core facing the first permanent magnet. The boss is provided with a first shaft hole for the shaft to pass through, and an avoidance channel is provided on the first permanent magnet, and part of the boss penetrates into the avoidance channel.

[0022] Further, a dynamic balance adjustment structure for the rotor assembly is provided on the first rotor core.

[0023] Further, both the first rotor core and the second rotor core are made of a magnetic conductive material.

[0024] Further, the first rotor core is formed by stamping a magnetic conductive steel plate, and the second rotor core is formed by laminating silicon steel sheets.

[0025] Further, a second rotor core lobe is formed between two adjacent magnetic steel grooves on the second rotor core. When the polar region of the first permanent magnet adjacent to the second rotor core lobe in the axial direction is of the first polarity, the polar regions of the two second permanent magnets adjacent to the second rotor core lobe in the circumferential direction are also of the first polarity.

[0026] According to another aspect of the present application, a motor is provided, including a rotor structure and a stator structure, and the rotor structure is the above-mentioned rotor structure.

[0027] Applying the technical solution of the present application, the rotor structure includes a first rotor assembly and a second rotor assembly. The magnetic force lines emitted from the axial direction of the first rotor assembly and the magnetic force lines emitted from the radial direction of the second rotor assembly are magnetically concentrated on the core of the rotor structure and then enter the air gap, which can greatly improve the magnetic concentration effect of the rotor structure. The first rotor assembly is set in two groups, and each group of the first rotor assemblies includes a first rotor core and a first permanent magnet. The first rotor core and the first permanent magnet are adjacent to each other. Protrusions extending along the circumferential direction of the first rotor core are provided on the circumferential direction of the first rotor core, which are used to conduct away part of the magnetic force lines of the first permanent magnet, so that the magnetic force lines directly pass through the air gap and enter the stator, which can reduce the repulsive force between the first rotor assembly and the second rotor assembly, reduce the assembly difficulty, and solve the problems in the prior art that the assembly difficulty is large and the motor reliability is low due to the large repulsive force of multiple rotor assemblies. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0029] Figure 1 shows a schematic structural diagram of a first embodiment of a rotor assembly according to this application;

[0030] Figure 2 shows a schematic structural diagram of a second embodiment of a rotor assembly according to this application;

[0031] Figure 3 shows a schematic structural diagram of a third embodiment of a rotor assembly according to this application;

[0032] Figure 4 shows a schematic structural diagram of a fourth embodiment of a rotor assembly according to this application;

[0033] Figure 5 shows a schematic structural diagram of a fifth embodiment of a rotor assembly according to this application;

[0034] Figure 6 shows a schematic structural diagram of a sixth embodiment of a rotor assembly according to this application;

[0035] Figure 7 shows a schematic structural diagram of a seventh embodiment of a rotor assembly according to this application;

[0036] Figure 8 shows a schematic structural diagram of an eighth embodiment of a rotor assembly according to this application;

[0037] Figure 9 shows a schematic structural diagram of a ninth embodiment of a rotor assembly according to this application;

[0038] Figure 10 shows a schematic structural diagram of a tenth embodiment of a rotor assembly according to this application;

[0039] Figure 11 shows a schematic structural diagram of an eleventh embodiment of a rotor assembly according to this application;

[0040] Figure 12 shows a schematic structural diagram of a twelfth embodiment of a rotor assembly according to this application;

[0041] Figure 13 shows a schematic structural diagram of a thirteenth embodiment of a rotor assembly according to this application;

[0042] Figure 14Shows a schematic comparison diagram of the rotor assembly according to the present application and the magnetic flux concentration technology of the prior art;

[0043] Figure 15 Shows a schematic comparison diagram of the no-load magnetic flux of the rotor assembly according to the present application and the prior art;

[0044] Figure 16 Shows a schematic comparison diagram of the air-gap magnetic flux density of the rotor assembly according to the present application and the prior art.

[0045] Among them, the above-mentioned drawings include the following reference numerals:

[0046] 10. Second rotor assembly;

[0047] 11. Second rotor iron core; 111. Second rotor iron core segment;

[0048] 12. Second permanent magnet;

[0049] 13. Second shaft hole;

[0050] 20. First rotor assembly;

[0051] 21. First rotor iron core;

[0052] 22. First shaft hole; 211. Limiting member;

[0053] 23. Protrusion;

[0054] 24. First permanent magnet; 241. Limiting structure; 242. Avoidance channel;

[0055] 25. Boss;

[0056] L. Central axis. Detailed implementation manners

[0057] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0058] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0059] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0060] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concept of these exemplary embodiments is fully conveyed to those of ordinary skill in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and thus their description will be omitted.

[0061] Combined with Figures 1 to 13 , in a specific embodiment of the present application, a rotor structure is provided.

[0062] Specifically, the rotor structure includes a first rotor assembly 20, and two sets of the first rotor assemblies 20 are provided. Each set of the first rotor assemblies 20 includes a first rotor core 21 and a first permanent magnet 24. The first rotor core 21 and the first permanent magnet 24 are arranged adjacent to each other. A protrusion 23 extending radially along the first rotor core 21 is provided on the radially outer side of the first rotor core 21. The first rotor core 21 is provided with a first shaft hole 22 for the shaft to pass through; a second rotor assembly 10, the second rotor assembly 10 includes a second rotor core 11 and a second permanent magnet 12. The second rotor core 11 is provided with a second shaft hole 13, and a plurality of magnet slots are provided in the circumferential direction of the second rotor core 11, and a second permanent magnet 12 is respectively arranged in each magnet slot. The two sets of the first rotor assemblies 20 are respectively arranged at both ends of the second rotor assembly 10, the second rotor core 11 is arranged between the first permanent magnets 24 of the two sets of the first rotor assemblies 20, and the first permanent magnet 24 is arranged between the end of the second rotor assembly 10 and the first rotor core 21.

[0063] The magnetic lines of force emitted from the first rotor assembly 20 in the axial direction and the magnetic lines of force emitted from the second rotor assembly 10 of the second rotor assembly 10 in the radial direction are magnetically concentrated on the iron core of the rotor structure and then enter the air gap, which can significantly improve the magnetic concentration effect of the rotor structure. The first rotor assembly 20 is provided in two groups, and each group of the first rotor assemblies 20 includes a first rotor iron core 21 and a first permanent magnet 24. The first rotor iron core 21 and the first permanent magnet 24 are arranged adjacent to each other. A protrusion 23 extending along the circumferential direction of the first rotor iron core 21 is provided on the circumference of the first rotor iron core 21, which is used to guide away part of the magnetic lines of force of the first permanent magnet 24, so that the magnetic lines of force directly pass through the air gap and enter the stator, which can reduce the repulsive force between the first rotor assembly 20 and the second rotor assembly 10 and reduce the assembly difficulty.

[0064] Combined Figure 1 As shown, in this embodiment, the rotor structure includes a first rotor assembly 20 and a second rotor assembly 10, which can significantly improve the magnetic concentration effect of the rotor structure. The first rotor assembly 20 is provided in two groups, and each group of the first rotor assemblies 20 includes a first rotor iron core 21 and a first permanent magnet 24. The first rotor iron core 21 and the first permanent magnet 24 are arranged adjacent to each other. A protrusion 23 extending along the radial direction of the first rotor iron core 21 is provided on the radial outer side of the first rotor iron core 21, which reduces the repulsive force between the rotor assemblies and reduces the assembly difficulty. The magnetic lines of force emitted from the first rotor assembly 20 in the axial direction and the magnetic lines of force emitted from the second rotor assembly 10 of the second rotor assembly 10 in the radial direction are magnetically concentrated on the first rotor iron core 21 and the second rotor iron core 11 and then enter the air gap, which can significantly improve the magnetic concentration effect of the rotor structure.

[0065] Furthermore, combined Figure 2 and Figure 7 As shown, the protrusion 23 extending outward along the radial direction of the first rotor iron core 21 is one or more.

[0066] In an embodiment of the present application, the number of the protrusions 23 provided on the first rotor iron core 21 is one. The protrusion 23 guides away part of the magnetic lines of force of the first permanent magnet 24, so that it directly passes through the air gap and enters the stator, which can reduce the repulsive force between the first rotor assembly 20 and the second rotor assembly 10 of the second rotor assembly 10 and reduce the assembly difficulty.

[0067] Furthermore, the number of the protrusions 23 is a, and a / 4 is an integer.

[0068] In another embodiment of the present application, the number of protrusions 23 provided on the first rotor core 21 is a multiple of 4 such as 4, 8, 12, 16, etc. Optimally, the number of protrusions 23 provided on the first rotor core 21 is four. An even number of protrusions 23 can make the interaction forces between the first rotor assembly 20 and the second rotor assembly 10 symmetrically distributed. However, too many protrusions 23 will reduce the number of magnetic lines of force of the first rotor assembly 20 entering the second rotor core 11 and reduce the magnetic focusing effect of the rotor assembly.

[0069] Further, there are multiple protrusions 23. When projected onto an axial end face of the rotor structure along the axial direction of the rotor structure, a line is connected between the geometric center of the protrusion 23 or the geometric centers of adjacent protrusions 23 and the central axis of the first rotor core 21. The central angle formed between adjacent connecting lines is b, and the number of pole pairs of the rotor structure is p. Among them, b / 360 / 2p = b0, and b0 is an integer.

[0070] Combined Figure 5 and Figure 9 As shown, the central angle between two adjacent protrusions 23 is b, and the number of pole pairs of the rotor structure is p. Among them, b / 360 / 2p = b0, and b0 is an integer. Such a setting can ensure the relative position of the protrusion 23 and the polar region of the first rotor assembly 20 and ensure that the protrusion 23 plays the most suitable role in reducing the repulsive force between the rotor assemblies.

[0071] Further, b / (360 / 2p) = b0, and b0 is an odd number.

[0072] In another embodiment of the present application, preferably, b / 360 / 2p = b0, and b0 is an odd number. Such a setting is beneficial. That b / (360 / 2p) is an odd number can ensure that the polar regions corresponding to each pair of protrusions are the same and improve the uniformity of the magnetic distribution.

[0073] Further, when projected onto an axial end face of the rotor structure along the axial direction of the rotor structure, the length of the line connecting any point on the outer circle of the first rotor core and the central axis of the first rotor core is c, and the length of the line connecting any point on the outer circle of the second rotor core and the central axis of the second rotor core is d. Among them, max(c) = max(d).

[0074] Combined Figure 3 and Figure 4As shown, in another embodiment of the present application, the length between the central axis of the first rotor core 21 and the outer circle of the first rotor core 21 is c, and the length between the central axis of the second rotor core 11 and the outer circle of the second rotor core 11 is d, where max(c) = max(d). In this embodiment, the setting of max(c) = max(d) ensures a certain air gap width between the rotor assembly and the stator assembly, improving the operating reliability of the motor and making the rotor structure more practical.

[0075] Further, when projected onto an axial end face of the rotor structure along the axial direction of the rotor structure, the length of the line connecting any point on the outer circle of the first permanent magnet 24 and the central axis of the first rotor core 21 is e, the length between the central axis of the second rotor core 11 and the end of the second permanent magnet 12 away from the second shaft hole 13 is f, and the length of the line connecting any point on the outer circle of the second rotor core 11 and the central axis of the second rotor core 11 is d, where min(e) = f or max(e) ≤ max(d). Such a setting can limit the distances of the first permanent magnet 24 and the second permanent magnet 12 from the central axis of the rotor, so as to achieve the mutual superposition of the magnetic lines of force of the first permanent magnet 24 and the second permanent magnet 12 in the radial direction of the rotor core and improve the magnetic flux concentrating effect of the motor.

[0076] Combined with Figure 3 and Figure 5 As shown, in an embodiment of the present application, the length between the central axis of the first rotor core 21 and the outer circle of the first permanent magnet 24 is e, and the length between the central axis of the second rotor core 11 and the end of the second permanent magnet 12 away from the second shaft hole 13 is f, where min(e) = f. Such a setting makes it easier for the protrusion 23 of the first rotor core 21 to conduct away part of the magnetic lines of force of the first permanent magnet 24, so as to reduce the repulsive force between the first rotor assembly 20 and the second rotor assembly 10, making the rotor structure more practical.

[0077] Combined with Figure 3 and Figure 5 As shown, in an embodiment of the present application, the length between the central axis of the first rotor core 21 and the outer circle of the first permanent magnet 24 is e, and the length between the central axis of the second rotor core 11 and the outer circle of the second rotor core 11 is d, where max(e) ≤ max(d). Such a setting makes it easier to reduce the repulsive force between the first rotor assembly 20 and the second rotor assembly 10 and avoid the problem of mutual repulsion between multiple rotor assemblies while improving the magnetic flux concentrating effect of the rotor structure by using multiple rotor assemblies.

[0078] Further, there are multiple protrusions 23, and the multiple protrusions 23 are arranged in pairs along the circumferential direction of the first rotor core 21.

[0079] Combined Figures 7 to 10 As shown, in this embodiment, a plurality of protrusions 23 are arranged in pairs along the circumferential direction of the first rotor core 21. The protrusions 23 can serve both the functions of circumferential positioning and fixing of the first rotor assembly 20. By means of the notches formed between the paired protrusions 23, the circumferential movement of the first rotor assembly 20 relative to the second rotor assembly 10 can be restricted. The protrusions 23 of the first rotor core 21 conduct part of the magnetic lines of force of the first permanent magnet 24, avoiding the difficulty in assembling the rotor structure caused by the repulsive force between the first rotor assembly 20 and the second rotor assembly 10.

[0080] Furthermore, the first permanent magnet 24 has an integral disc structure and is divided into a plurality of different polarity regions according to the magnetization direction. Such a setting can reduce the production and assembly costs of the first permanent magnet 24. After magnetization, different polarity regions are distributed to achieve the cooperation with the polarity of the second permanent magnet 12.

[0081] Furthermore, when projected onto an axial end face of the rotor structure along the axial direction of the rotor structure, the positions of at least one pair of protrusions 23 correspond to the positions of the magnetic pole dividing lines of the adjacent polarity regions of the first permanent magnet 24.

[0082] Combined Figure 6 As shown, in this embodiment, when projected onto an axial end face of the rotor structure along the axial direction of the rotor structure, the positions of at least one pair of protrusions 23 correspond to the positions of the magnetic pole dividing lines of the adjacent polarity regions of the first permanent magnet 24. Such a setting can ensure the uniqueness of the distribution of the polarity regions of the first rotor assembly 20.

[0083] Furthermore, two adjacent pairs of protrusions 23 are symmetrically arranged about the center line of a polarity region of the first permanent magnet 24.

[0084] Combined Figure 6 As shown, by symmetrically arranging two adjacent pairs of protrusions 23 about the center line of a polarity region of the first permanent magnet 24, it is helpful to conduct the magnetic lines of force of each polarity region to the stator, thereby reducing the repulsive force between the first rotor assembly 20 and the second rotor assembly 10 and enhancing the stability of the rotor structure.

[0085] Furthermore, the length of the protrusion 23 extending in the radial direction of the first rotor core 21 is g, and the minimum thickness of the first rotor core 21 in the axial direction is h, where g ≥ 0.3*h.

[0086] Combined Figure 9 and Figure 11As shown, in this embodiment, the length of the protrusion 23 extending in the radial direction of the first rotor core 21 is g, and the minimum thickness of the first rotor core 21 in the axial direction is h. The setting of g≥0.3*h is to strengthen the connection strength between the protrusion 23 and the first rotor core 21, limit the minimum size of the radial extension of the protrusion 23, and avoid the unclear guiding effect on the magnetic field of the first permanent magnet 24 due to its too small size, making the working state of the rotor structure more stable.

[0087] Further, when projected onto an axial end face of the rotor structure along the axial direction of the rotor structure, the thickness of the second permanent magnet 12 in its magnetization direction is i, and the interval width between each pair of protrusions 23 in the tangential direction of the first rotor core 21 is j, where j≥0.25*i.

[0088] Combined with Figure 3 and Figure 9 As shown, in this embodiment, when projected onto an axial end face of the rotor structure along the axial direction of the rotor structure, the thickness of the second permanent magnet 12 in its magnetization direction is i, and the interval width between each pair of protrusions 23 in the tangential direction of the first rotor core 21 is j. j≥0.25*i can ensure the relative interval distance between two adjacent protrusions 23. The protrusion 23 can take into account the circumferential fixing effect of the first rotor assembly 20, limit the minimum value of its tangential width, and avoid the low reliability of the fixing effect of the protrusion 23.

[0089] Further, the first rotor core 21 is provided with a limiting member 211, and the first permanent magnet 24 is provided with a limiting structure 241, and the limiting member 211 and the limiting structure 241 are correspondingly arranged.

[0090] In another embodiment of the present application, there are multiple limiting members 211 and multiple limiting structures 241, and the multiple limiting members 211 and the multiple limiting structures 241 are arranged in one-to-one correspondence. Such a setting can make the connection between the first rotor core 21 and the first permanent magnet 24 more stable.

[0091] Combined with Figure 8 and Figure 12 As shown, during the assembly process of the rotor structure, the limiting member 211 on the first rotor core 21 and the limiting structure 241 on the first permanent magnet 24 cooperate with each other to complete positioning, prevent the first rotor core 21 and the first permanent magnet 24 from moving and generating abnormal noises during the operation of the first rotor assembly 20, and reduce the friction and loss of the first rotor assembly 20.

[0092] Combined with Figure 1 and Figure 8As shown, in another embodiment of the present application, the limiting member 211 can be set as a protrusion extending along the axial direction of the first rotor core 21, and the limiting structure 241 is set as a positioning groove. Such a setting replaces the screw and bolt connections in the prior art, reduces the number of parts, reduces the production cost and the assembly time cost, and improves the economy of the rotor structure.

[0093] Furthermore, a boss 25 is provided on the side of the first rotor core 21 facing the first permanent magnet 24. The boss 25 is provided with a first shaft hole 2412 for the shaft to pass through. An avoidance channel 242 is provided on the first permanent magnet 24, and a part of the boss 25 penetrates into the avoidance channel 242.

[0094] Combined with Figure 10 As shown, in an embodiment of the present application, a boss 25 is provided on the side of the first rotor core 21 facing the first permanent magnet 24, and an avoidance channel 242 is provided on the first permanent magnet 24. The outer peripheral surface of the boss 25 located in the avoidance channel 242 is arranged at a distance from the side wall of the avoidance channel 242, which can realize the functions of positioning, supporting, and fixing the first rotor assembly 20 and the second rotor assembly 10 during the production and assembly process, reduce the assembly difficulty of the rotor structure, and increase the assembly efficiency of the rotor structure.

[0095] Furthermore, a through groove extending along the axial direction of the first rotor core 21 is provided on the outer peripheral side of the first rotor core 21. Combined with Figure 8 As shown, a through groove extending along the axial direction is provided on the outer peripheral surface of the first rotor core 21 along the circumferential direction of the first rotor core 21. Such a setting can reduce the volume and weight of the first rotor core 21 and save its material cost.

[0096] Furthermore, a dynamic balance adjustment structure for the rotor assembly is provided on the first rotor core 21.

[0097] In the above embodiment, in order to keep the first rotor assembly 20 in a dynamic balance during the working state, a dynamic balance adjustment structure for the rotor assembly is provided on the first rotor core 21. Such a setting can increase the reliability and stability of the first rotor assembly 20.

[0098] In an embodiment of the present application, both the first rotor core 21 and the second rotor core 11 are made of a magnetic conductive material.

[0099] In another embodiment of the present application, the first rotor core 21 is formed by stamping a magnetic conductive steel plate, which has the advantages of simple manufacturing, relatively low production cost, short production cycle, and better maintenance flexibility. The second rotor core 11 is formed by laminating silicon steel sheets. Since silicon steel sheets have the advantages of high magnetic permeability, low hysteresis loss, and low coercive force, they can reduce the energy loss of the motor and improve the efficiency of the motor. Moreover, silicon steel sheets have good mechanical strength and corrosion resistance, and can withstand the vibration and high temperature during the operation of the motor.

[0100] Further, as shown in Figure 13 When a second rotor core lobe 111 is formed between two adjacent magnetic steel grooves on the second rotor core 11, and the polar region of the first permanent magnet 24 adjacent to the second rotor core lobe 111 in the axial direction is of the first polarity, the polar regions of the two second permanent magnets 12 adjacent to the second rotor core lobe 111 in the circumferential direction are also of the first polarity. In another embodiment of the present application, the second rotor core 11 includes the second rotor core lobe 111, and a second rotor core lobe 111 is arranged between two adjacent magnetic steel grooves 212, wherein the polarities of the two adjacent magnetic steel grooves are the same as the polarity of the first permanent magnet 24 adjacent to the second rotor core lobe 111.

[0101] Preferably, the first permanent magnet 24 is magnetized with NS poles alternating in the axial direction, and the second permanent magnet 12 is magnetized with NS poles alternating in the tangential direction. Under a certain pole, the magnetization directions of both point to the second rotor core 11. In this magnetization mode, the magnetic flux linkage of the first permanent magnet 24 and the second permanent magnet 12 can be superimposed to improve the no-load magnetic flux linkage.

[0102] In another embodiment of the present application, the first rotor core 21 and the first permanent magnet 24 are fixedly connected. This setting can reduce the vibration and abnormal noise generated by the first rotor assembly 20 and make the operation of the rotor structure more stable and reliable. In the present application, the fixing method of the first permanent magnet 24 and the first rotor core 21 is not limited to adsorption, adhesion, or fixing through a mechanical structure, etc., as long as there is no relative movement between the first permanent magnet 24 and the first rotor core 21.

[0103] In another embodiment of the present application, a motor is further provided, which includes a rotor structure and a stator structure, and the rotor structure is the rotor structure in the above embodiment.

[0104] Specifically, the rotor structure includes a first rotor assembly 20, and the first rotor assembly 20 is provided in two groups. Each group of the first rotor assembly 20 includes a first rotor core 21 and a first permanent magnet 24. The first rotor core 21 and the first permanent magnet 24 are arranged adjacent to each other. A protrusion 23 extending radially along the first rotor core 21 is provided on the radially outer side of the first rotor core 21. The first rotor core 21 is provided with a first shaft hole 22 for the shaft to pass through; a second rotor assembly 10, the second rotor assembly 10 includes a second rotor core 11 and a second permanent magnet 12. The second rotor core 11 is provided with a second shaft hole 13. A plurality of magnet slots are provided in the circumferential direction of the second rotor core 11, and a second permanent magnet 12 is respectively arranged in each magnet slot. The two groups of the first rotor assemblies 20 are respectively arranged at both ends of the second rotor assembly 10. The second rotor core 11 is arranged between the first permanent magnets 24 of the two groups of the first rotor assemblies 20. The first permanent magnet 24 is arranged between the end of the second rotor assembly 10 and the first rotor core 21.

[0105] The magnetic field lines emitted from the first rotor assembly 20 in the axial direction and the magnetic field lines emitted from the second rotor assembly 10 of the second rotor assembly 10 in the radial direction are magnetically concentrated on the iron core of the rotor structure and then enter the air gap, which can greatly improve the magnetic concentration effect of the rotor structure. The first rotor assembly 20 is provided in two groups. Each group of the first rotor assembly 20 includes a first rotor core 21 and a first permanent magnet 24. The first rotor core 21 and the first permanent magnet 24 are arranged adjacent to each other. A protrusion 23 extending circumferentially along the first rotor core 21 is provided in the circumferential direction of the first rotor core 21, which is used to guide away part of the magnetic field lines of the first permanent magnet 24, so that the magnetic field lines directly pass through the air gap and enter the stator, which can reduce the repulsive force between the first rotor assembly 20 and the second rotor assembly 10 of the second rotor assembly 10 and reduce the assembly difficulty.

[0106] In this embodiment, the rotor structure includes a first rotor assembly 20 and a second rotor assembly 10, which can greatly improve the magnetic concentration effect of the rotor structure. The first rotor assembly 20 is provided in two groups. Each group of the first rotor assembly 20 includes a first rotor core 21 and a first permanent magnet 24. The first rotor core 21 and the first permanent magnet 24 are arranged adjacent to each other. A protrusion 23 extending circumferentially along the first rotor core 21 is provided in the circumferential direction of the first rotor core 21, which reduces the repulsive force between the rotor assemblies and reduces the assembly difficulty.

[0107] Combined Figures 14 to 16 As shown, compared with the prior art, the motor in the above embodiment has a significantly increased magnetic concentration coefficient, stronger no-load magnetism, and the air-gap magnetic density is basically between 0.2 mm and 0.4 mm, which can ensure the stability and efficiency of the motor at the same time.

[0108] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0109] The magnetic field lines emitted from the first rotor assembly 20 in the axial direction and the magnetic field lines emitted from the second rotor assembly 10 of the second rotor assembly 10 in the radial direction converge on the iron core of the rotor structure and then enter the air gap, which can significantly improve the magnetic field concentration effect of the rotor structure.

[0110] The first rotor assembly 20 is provided in two groups. Each group of the first rotor assemblies 20 includes a first rotor iron core 21 and a first permanent magnet 24. The first rotor iron core 21 and the first permanent magnet 24 are arranged adjacent to each other. A protrusion 23 extending radially along the first rotor iron core 21 is provided on the radially outer side of the first rotor iron core 21, which is used to guide away part of the magnetic field lines of the first permanent magnet 24, so that the magnetic field lines directly pass through the air gap and enter the stator, which can reduce the repulsive force between the first rotor assembly 20 and the second rotor assembly 10 of the second rotor assembly 10 and reduce the assembly difficulty.

[0111] The protrusion 23 provided on the first rotor iron core 21 helps to reduce the repulsive force between the first rotor assembly 20 and the second rotor assembly 10 of the second rotor assembly 10, reduces the assembly difficulty of the rotor structure, and increases the assembly efficiency of the rotor structure.

[0112] The first permanent magnet 24 is of an integral disc structure, or the first rotor iron core 21 and the first permanent magnet 24 are fixedly connected. Such a setting can reduce the vibration and abnormal noise generated by the first rotor assembly 20 and make the operation of the rotor structure more stable and reliable.

[0113] For the sake of description, spatial relative terms, such as "above...", "over...", "on the upper surface of...", "upper...", etc., can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure of the device. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "over other devices or structures" will be positioned as "below other devices or structures" or "under other devices or structures" afterwards. Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding explanations are made for the spatial relative descriptions used here.

[0114] In addition to the above, it should be noted that the "one embodiment", "another embodiment", "embodiment" and the like mentioned in this specification refer to the specific features, structures or characteristics described in connection with that embodiment being included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in connection with any one embodiment, it is intended that the implementation of such feature, structure or characteristic in combination with other embodiments also fall within the scope of this application.

[0115] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0116] The above are only the preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A rotor structure, characterized in that, it includes: A first rotor assembly (20), two sets of the first rotor assemblies (20) are provided, each set of the first rotor assemblies (20) includes a first rotor core (21) and a first permanent magnet (24), the first rotor core (21) and the first permanent magnet (24) are arranged adjacent to each other, a protrusion (23) extending radially along the first rotor core (21) is provided on the radially outer side of the first rotor core (21), and the first rotor core (21) is provided with a first shaft hole (22) for a rotating shaft to pass through; A second rotor assembly (10), the second rotor assembly (10) includes a second rotor core (11) and a second permanent magnet (12), the second rotor core (11) is provided with a second shaft hole (13), and a plurality of magnet slots are provided in the circumferential direction of the second rotor core (11), and each of the magnet slots is respectively provided with one of the second permanent magnets (12); The two sets of the first rotor assemblies (20) are respectively arranged at the axial two ends of the second rotor assembly (10), the second rotor core (11) is arranged between the first permanent magnets (24) of the two sets of the first rotor assemblies (20), and the first permanent magnet (24) is arranged between the end of the second rotor assembly (10) and the first rotor core (21).

2. The rotor structure according to claim 1, characterized in that, The protrusion (23) extending radially outward along the first rotor core (21) is one or more.

3. The rotor structure according to claim 2, characterized in that, The number of the protrusions (23) is a, and a / 4 is an integer.

4. The rotor structure according to claim 2, characterized in that, The protrusions (23) are multiple. When projected onto an axial end face of the rotor structure along the axial direction of the rotor structure, the geometric center of the protrusion (23) or the geometric centers of adjacent protrusions (23) are connected to the central axis of the first rotor core (21), and the central angle formed between adjacent connections is b, and the number of pole pairs of the rotor structure is p. Among them, b / (360 / 2p) = b0, and b0 is an integer.

5. The rotor structure according to claim 4, characterized in that, b / (360 / 2p) = b0, and b0 is an odd number.

6. The rotor structure according to claim 1, characterized in that, When projected onto an axial end face of the rotor structure along the axial direction of the rotor structure, the length of the connection line between the central axis of the first rotor core (21) and any point on the outer circle of the first rotor core (21) is c, and the length of the connection line between the central axis of the second rotor core (11) and any point on the outer circle of the second rotor core (11) is d. Among them, max(c) = max(d).

7. The rotor structure according to claim 1, characterized in that, Projecting along the axial direction of the rotor structure on an axial end face of the rotor structure, the length of the connection line between the central axis of the first rotor core (21) and any point on the outer circle of the first permanent magnet (24) is e, the length between the central axis of the second rotor core (11) and the center point of the end edge of the second permanent magnet (12) away from the second shaft hole (13) is f, and the length of the connection line between the central axis of the second rotor core (11) and any point on the outer circle of the second rotor core (11) is d, where min(e) = f or max(e) ≤ max(d).

8. The rotor structure according to claim 2, wherein, there are a plurality of the protrusions (23), and the plurality of the protrusions (23) are arranged in pairs along the circumferential direction of the first rotor core (21).

9. The rotor structure according to claim 1, wherein, the first permanent magnet (24) is of an integral disk structure and is divided into a plurality of different polarity regions according to the magnetization direction.

10. The rotor structure according to claim 8, wherein, Projecting along the axial direction of the rotor structure on an axial end face of the rotor structure, the positions of at least one pair of the protrusions (23) correspond to the positions of the magnetic pole dividing lines of the adjacent polarity regions of the first permanent magnet (24).

11. The rotor structure according to claim 8, wherein, adjacent pairs of the protrusions (23) are symmetrically arranged with respect to the center line of a polarity region of the first permanent magnet (24).

12. The rotor structure according to claim 1, wherein, the length of the protrusion (23) extending along the radial direction of the first rotor core (21) is g, and the minimum thickness of the first rotor core (21) in the axial direction is h, where g ≥ 0.3*h.

13. The rotor structure according to claim 1 or 8, wherein, Projecting along the axial direction of the rotor structure on an axial end face of the rotor structure, the thickness of the second permanent magnet (12) in its magnetization direction is i, and the interval width between adjacent protrusions (23) in the tangential direction of the first rotor core (21) is j, where j ≥ 0.25*i.

14. The rotor structure according to claim 1, wherein, the first rotor core (21) is provided with a limiting member (211), the first permanent magnet (24) is provided with a limiting structure (241), and the limiting member (211) and the limiting structure (241) are arranged correspondingly.

15. The rotor structure according to claim 14, wherein, there are a plurality of the limiting members (211) and a plurality of the limiting structures (241), and the plurality of the limiting members (211) and the plurality of the limiting structures (241) are arranged in one-to-one correspondence.

16. The rotor structure according to claim 11, wherein, A boss (25) is provided on one side of the first rotor core (21) facing the first permanent magnet (24). An avoidance channel (242) is provided on the first permanent magnet (24), and a part of the boss (25) penetrates through the avoidance channel (242).

17. The rotor structure according to claim 1, characterized in that, a rotor assembly dynamic balance adjustment structure is provided on the first rotor core (21).

18. The rotor structure according to claim 1, characterized in that, both the first rotor core (21) and the second rotor core (11) are made of a magnetic conductive material.

19. The rotor structure according to claim 18, characterized in that, the first rotor core (21) is formed by stamping a magnetic conductive steel plate, and the second rotor core (11) is formed by laminating silicon steel sheets.

20. The rotor structure according to claim 9, characterized in that, a second rotor core segment (111) is formed between two adjacent magnetic steel grooves on the second rotor core (11). When the polar region of the first permanent magnet (24) adjacent to the second rotor core segment (111) in the axial direction is of the first polarity, the polar regions of the two second permanent magnets (12) adjacent to the second rotor core segment (111) in the circumferential direction are also of the first polarity.

21. A motor, comprising a rotor structure and a stator structure, characterized in that, the rotor structure is the rotor structure according to any one of claims 1 to 20.

Images