Rotor, electric machine and drive system

Abstract

The utility model discloses a rotor, motor and driving system relates to motor technical field, and the rotor includes annular main part and a plurality of permanent magnet, wherein, annular main part is provided with at least one hollow area, and the hollow area is provided with mesh structure, and the mesh structure includes a plurality of recessed meshes, and the recessed mesh includes connecting beam and arc beam, and the arc beam is provided with two, and two arc beams are oppositely arranged, and all are inwards recessed mesh inside recessed arrangement, and the both ends of two arc beams are connected through two connecting beams to make arc beam and connecting beam surround recessed mesh, and a plurality of permanent magnets are arranged in the inside of annular main part. The utility model provides technical scheme through setting up the dilatancy type dot matrix structure with recessed arc beam on the rotor shell, can realize the lightweight of rotor at the same time, and gives consideration to high -efficient heat dissipation performance and excellent mechanical bearing capacity.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a rotor, motor and drive system. Background Technology

[0002] As a key rotating component in the motor system responsible for energy conversion, the outer rotor of a permanent magnet brushless motor primarily serves to provide a mounting platform for the permanent magnets and works in conjunction with the stator core to construct a complete electromagnetic circuit. Due to its high torque density and flexible structural layout, permanent magnet brushless motors have been widely deployed in applications such as UAV propulsion systems, industrial robot joint drives, new energy vehicle wheel hub motors, and aerospace precision actuators.

[0003] In existing permanent magnet brushless motors, the rotor is typically composed of a one-piece molded magnetically conductive metal shell, forming a closed or semi-closed rotary cylindrical structure. Several permanent magnets are arranged circumferentially along the inner wall of the shell and fixed by adhesive or clamping. During motor operation, heat continuously accumulates inside the rotor and is then gradually transferred to the outer surface via thermal conduction through the rotor shell metal, before being dissipated into the surrounding environment.

[0004] However, due to the single heat dissipation channel and relatively long conduction path inside the rotor, the overall thermal resistance is relatively high. As a result, the heat that continuously accumulates inside the rotor is difficult to be quickly dissipated to the outer surface. Local temperature concentrations are easily formed on the back of the permanent magnet and in the inner layer of the rotor, which may cause irreversible demagnetization of the permanent magnet, thereby affecting the effective utilization of the motor's power density and the operational stability and reliability during long-term service. Utility Model Content

[0005] The main purpose of this invention is to propose a rotor, motor and drive system that aims to achieve lightweighting, efficient heat dissipation and excellent mechanical properties of the rotor from a structural perspective.

[0006] To achieve the above objectives, this utility model proposes a rotor comprising: A ring-shaped main body has at least one hollow area with a mesh structure comprising multiple concave mesh holes. Each concave mesh hole includes connecting beams and arc-shaped beams. Two arc-shaped beams are arranged opposite each other and are both recessed into the concave mesh holes. The two ends of the two arc-shaped beams are connected by two connecting beams, so that the arc-shaped beams and the connecting beams form the concave mesh holes. Multiple permanent magnets are disposed on the inner side of the annular body.

[0007] In one embodiment, the plurality of concave mesh holes are arranged in multiple rows along the circumference of the annular body, and each row of the concave mesh holes includes a plurality of concave mesh holes distributed along the axial direction of the annular body, with the concave mesh holes in adjacent rows being staggered along the axial direction of the annular body.

[0008] In one embodiment, each of the connecting beams is connected at both ends to the middle of two of the arc-shaped beams in an adjacent row, and the arc-shaped portion of the arc-shaped beam is spaced apart from the arc-shaped beams in the adjacent row.

[0009] In one embodiment, the two ends of the connecting beam are respectively connected to the deepest recess of the two arc-shaped beams in adjacent rows.

[0010] In one embodiment, adjacent concave mesh openings in the same row share the same connecting beam.

[0011] In one embodiment, multiple hollow areas are provided, and the multiple hollow areas are distributed along the circumferential direction of the annular body. There is a gap between adjacent hollow areas to form a solid area on the annular body.

[0012] In one embodiment, the permanent magnet is positioned corresponding to the hollowed-out area.

[0013] In one embodiment, the permanent magnet covers the corresponding hollow area.

[0014] This utility model also proposes an electric motor, including the aforementioned rotor.

[0015] This utility model also proposes a drive system, including the aforementioned motor.

[0016] In the technical solution provided by this utility model, by setting a hollow area with concave mesh holes formed by arc-shaped beams and connecting beams on the annular body, the annular body forms a tensile lattice structure. On the one hand, the high perforation rate design of the hollowed-out area can significantly reduce the amount of material used while ensuring structural rigidity and strength, thereby effectively reducing the rotor's moment of inertia and improving the motor's dynamic response capability. On the other hand, the arc-shaped beam is recessed into the concave mesh, giving the mesh structure a tensile mechanical property with a negative Poisson's ratio. Under load, the arc-shaped beam transmits stress evenly through progressive bending deformation, effectively avoiding the problem of stress concentration at sharp corners that leads to fatigue failure in traditional zigzag structures. Thus, it has good rigidity, strength, and impact toughness under complex working conditions. Furthermore, the through-hole network formed by multiple concave meshes provides abundant heat dissipation channels and a large internal surface area. When the rotor rotates, it can actively drive the cooling medium to flow through the porous network to achieve forced convection heat dissipation, fundamentally improving the passive heat dissipation mode of traditional solid rotors that rely solely on heat conduction, effectively reducing the operating temperature of the permanent magnet and ensuring the thermal stability of the permanent magnet. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of an embodiment of the rotor provided by this utility model; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 A schematic diagram of the structure of an embodiment of the motor provided by this utility model; Figure 4 for Figure 3 A schematic diagram of the explosion structure.

[0019] Explanation of icon numbers: 100. Rotor; 1. Annular body; 11. Hollowed-out area; 12. Solid area; 21. Concave mesh; 211. Arc beam; 212. Connecting beam; 3. Permanent magnet; 200. Motor; 4. Stator; 5. Support shaft; 6. Bearing; 7. Base; 8. Top cover.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] Permanent magnet brushless motors, with their excellent comprehensive performance, have been widely used in high-end fields such as UAV propulsion systems, industrial robot joint drives, new energy vehicles, and aerospace. However, the outer rotor of traditional permanent magnet brushless motors usually adopts a one-piece molded homogeneous magnetic conductive metal shell, which is a closed or semi-closed rotary cylindrical structure. When the motor operates at high power density, this structure faces three core contradictions: First, the rotational inertia of the homogeneous solid shell is relatively large, resulting in insufficient dynamic response capability of the motor; second, the internal heat dissipation path of the rotor is single and the thermal resistance is high, making it easy for local overheating to occur in the back area of ​​the permanent magnet, which can lead to irreversible demagnetization; third, it is difficult for homogeneous materials to simultaneously achieve high stiffness, high toughness, and fatigue resistance under complex loads.

[0025] To solve the above-mentioned technical problems, this utility model provides a rotor 100, which achieves synergistic optimization of lightweight, efficient heat dissipation and mechanical performance from the structural body level by setting a hollow area 11 with a tensile lattice topology on the annular body 1.

[0026] Please see Figures 1 to 2 The rotor 100 includes an annular body 1 and multiple permanent magnets 3. The annular body 1 is a rotating structure, generally in the shape of an annular cylinder. The annular body 1 has at least one hollow area 11, which has a mesh structure. The multiple permanent magnets 3 are disposed on the inner side of the annular body 1 and arranged at intervals along the circumference of the annular body 1. Exemplarily, the permanent magnets 3 can be fixed to the inner wall of the annular body 1 by adhesive bonding, installed on the inner wall of the annular body 1 by snap-fit, or positioned on the inner side of the annular body 1 by embedding. The permanent magnets 3 can be made of high-performance permanent magnet materials such as neodymium iron boron magnets, ferrite magnets, or samarium cobalt magnets.

[0027] The mesh structure includes multiple concave mesh openings 21, each of which is formed by connecting beams 212 and arc-shaped beams 211. Specifically, each concave mesh opening 21 includes two arc-shaped beams 211 and two connecting beams 212. The two arc-shaped beams 211 are arranged opposite each other and are both recessed into the interior of the concave mesh opening 21. The two ends of the two arc-shaped beams 211 are connected by the two connecting beams 212. That is, one end of one arc-shaped beam 211 is connected to one end of another arc-shaped beam 211 by a connecting beam 212, and the other end of the arc-shaped beam 211 is connected to the other end of the other arc-shaped beam 211 by another connecting beam 212, so that the two arc-shaped beams 211 and the two connecting beams 212 together form the concave mesh opening 21. Therefore, each concave mesh opening 21 has a shape with concave sides.

[0028] In the technical solution provided by this utility model, by setting a hollow area 11 with a mesh structure on the annular body 1 and setting multiple permanent magnets 3 on the inner side of the annular body 1, the annular body 1 forms an integrated topological configuration that combines a load-bearing frame and a porous heat dissipation channel. Specifically, the concave mesh 21 is formed by two opposing arc-shaped beams 211, both of which are concave inward, and two connecting beams 212, so that each concave mesh 21 is concave on both sides. On the one hand, the high-permeability porous network composed of multiple concave meshes 21 significantly reduces material usage while ensuring structural rigidity, effectively reducing the mass and moment of inertia of the annular body 1, thereby improving the dynamic response capability of the motor. On the other hand, the concave shape of the arc beam 211 endows the mesh structure with tensile mechanical properties of negative Poisson's ratio. Under load, the arc beam 211 transmits stress uniformly with continuous and smooth bending deformation, without stress singularities at the sharp corners of the broken lines, thus effectively avoiding fatigue failure caused by stress concentration. This allows the rotor 100 to have good rigidity, strength, and impact toughness under complex working conditions such as high-speed rotation, multi-axis vibration, and impact loads. Furthermore, the through-hole network formed by multiple concave meshes 21 provides abundant heat dissipation channels and a large heat exchange wall area. When the rotor 100 rotates, it can drive the cooling medium to flow through the mesh structure to achieve forced convection heat dissipation, fundamentally changing the passive heat dissipation mode of traditional solid rotors that rely solely on heat conduction through the metal walls. This effectively reduces the operating temperature of the permanent magnet 3, ensuring the thermal stability of the permanent magnet 3 and the long-term operational reliability of the motor.

[0029] In the technical solution of this utility model, the arc-shaped beam 211 adopts an inwardly concave, smooth circular arc shape, which is the core structural basis for realizing the tensile expansion effect (negative Poisson's ratio effect). The following is a detailed description of the shape and technical effects of the arc-shaped beam 211.

[0030] The arc beam 211 is a continuous and smooth circular arc curve structure, without any sharp corners, broken lines or other geometric abrupt changes throughout the entire structure. When the rotor 100 is subjected to axial force, centrifugal force or impact load during operation, the concave geometry of the arc beam 211 causes each concave mesh 21 to undergo arc edge bending deformation under axial force, and the concave mesh 21 as a whole expands or contracts laterally, thereby generating a negative Poisson's ratio (tensile expansion) effect.

[0031] Specifically, the smooth circular arc configuration of the curved beam 211 brings the following three technical benefits: Firstly, the stress is evenly distributed. The smooth arc surface of the arc beam 211 has no stress singularities (i.e., no sharp corners). Under load, the stress is evenly distributed and transmitted along the arc length. The maximum stress value is significantly reduced compared to the broken line structure of the same size, effectively avoiding the serious stress concentration problem caused by sharp corners.

[0032] Secondly, the tensile expansion effect is stable throughout the entire process. Since the curvature of the arc beam 211 is continuous and constant, the opening angle of the concave mesh 21 changes linearly and continuously with the axial displacement throughout the entire process of external force loading. This allows the structure to maintain a negative Poisson's ratio stably throughout the entire load range from initial loading to ultimate compression, and the tensile expansion effect is stable and without abrupt changes.

[0033] Third, energy absorption is stable and efficient. The curved beam 211 exhibits a progressive bending deformation mode under load, and its stress-strain curve has an ultra-long stable plateau segment, which can achieve continuous and stable energy absorption.

[0034] Furthermore, the continuous smooth arc configuration of the arc beam 211 provides excellent fatigue resistance for the mesh structure. Under long-term cyclic load conditions of high-speed motor rotation, the arc beam 211, due to the absence of stress concentration points and strong deformation reversibility, can undergo repeated tensile and axial deformation without crack initiation, thus avoiding the defect of fatigue failure under low-cycle loading caused by repeated stress concentration at sharp corners in the polygonal structure.

[0035] The connecting beam 212 is a structural beam connecting the ends of two arc-shaped beams 211 to form a closed mesh profile. For example, the connecting beam 212 can be arranged as a straight segment to serve as the upper and lower boundary edges of the concave mesh 21, providing vertical load-bearing and limiting functions for the concave mesh 21; the connecting beam 212 can also be arranged in a slightly arc shape to form a smoother transition profile with the arc-shaped beams 211.

[0036] In embodiments of this invention, multiple concave mesh holes 21 are arranged in multiple rows along the circumference of the annular body 1, and each row of concave mesh holes 21 includes multiple concave mesh holes 21 distributed along the axial direction of the annular body 1. This arrangement results in a two-dimensional periodic arrangement of the mesh structure within the hollow area 11 of the annular body 1, forming a continuous porous network in both the circumferential and axial dimensions of the annular body 1.

[0037] Furthermore, the concave mesh 21 located in adjacent rows are offset in the axial direction of the annular body 1. That is, the concave mesh 21 in adjacent rows are not directly aligned in the axial direction, but are offset from each other by a certain distance in the axial direction. For example, the offset distance can be half the axial length of a single concave mesh 21, so that the concave mesh 21 in adjacent rows are arranged in a staggered manner. This arrangement, on the one hand, makes the load transmission path more diverse, and the external force can be distributed and transmitted in multiple paths in the transverse and longitudinal directions, avoiding through-force damage in a single direction; on the other hand, the staggered arrangement allows the arc-shaped beams 211 in adjacent rows to constrain and couple with each other during deformation, forming a more coordinated overall deformation mode, which is conducive to maintaining a consistent negative Poisson's ratio effect throughout the entire domain.

[0038] In this embodiment of the invention, both ends of each connecting beam 212 are respectively connected to the middle of two arc-shaped beams 211 in an adjacent row. That is, the upper end of an arc-shaped beam 211 in the current row is connected to the middle of an arc-shaped beam 211 in the adjacent row above, and the lower end of the arc-shaped beam 211 is connected to the middle of another arc-shaped beam 211 in the adjacent row below. This arrangement forms a chain-like interlocking network of all arc-shaped beams 211. Each arc-shaped beam 211 belongs to the sidewall of the concave mesh 21 in its own row, and also forms a force transmission node with the arc-shaped beams 211 in the adjacent row through the connection relationship of its ends, thereby realizing continuous load bearing and coordinated deformation of the mesh structure throughout the entire range.

[0039] Meanwhile, the arc-shaped portion of the arc-shaped beam 211 (i.e., the main body of the arc-shaped segment of the arc-shaped beam 211) is spaced apart from the adjacent rows of arc-shaped beams 211. That is, although the ends of the arc-shaped beam 211 connect to the adjacent rows of arc-shaped beams 211, the main body of the arc-shaped segment of the arc-shaped beam 211 does not directly contact or overlap with the adjacent rows of arc-shaped beams 211; a certain distance is maintained between them to form a through space for the mesh. This arrangement ensures structural connectivity between adjacent rows of mesh, forming a heat dissipation channel, while also preventing direct collisions or interference between the arc-shaped segments of adjacent arc-shaped beams 211 during deformation, ensuring that each arc-shaped beam 211 can freely bend and deform to achieve a tensile expansion effect. Furthermore, when the rotor 100 rotates, airflow can also gather and rotate within this through space, further increasing the heat dissipation effect.

[0040] Furthermore, in this embodiment of the invention, the two ends of the connecting beam 212 are respectively connected to the deepest recesses of two adjacent rows of arc-shaped beams 211. The deepest recess is the position where the radial concavity of the arc-shaped beam 211 is the greatest, that is, the narrowest part of the arc-shaped profile of the arc-shaped beam 211. With this arrangement, the end connection points of the connecting beam 212 are located precisely at the position of maximum curvature of the adjacent rows of arc-shaped beams 211. On the one hand, connecting at this position can maximize the use of the entire arc length of the arc-shaped beam 211 for bending deformation, thereby maximizing the tensile deformation range of the mesh; on the other hand, connecting at the deepest recess makes the force transmission path between adjacent rows of mesh the shortest and most direct, resulting in higher mechanical efficiency; in addition, since the deepest recess is the center of symmetry of the arc-shaped beam 211, connecting at this position can also ensure the overall topological symmetry of the mesh structure, making the bidirectional force performance of the arc-shaped beam 211 highly balanced and significantly reducing mechanical anisotropy.

[0041] In this embodiment of the invention, adjacent concave mesh openings 21 in the same row share the same connecting beam 212. That is, between two adjacent concave mesh openings 21 arranged along the axial direction of the annular body 1 in the same row, the connecting beam 212 of one concave mesh opening 21 also serves as the connecting beam 212 of the adjacent concave mesh opening 21. This arrangement reduces redundant material in the structure, further reducing the overall mass and moment of inertia of the annular body 1; on the other hand, the shared connecting beam 212 forms a continuous load-bearing skeleton in the vertical direction, connecting multiple concave mesh openings 21 in the same row into an integrated load-bearing chain, improving the overall structural continuity and load-bearing efficiency of the mesh structure along the axial direction.

[0042] In embodiments of this utility model, multiple hollow areas 11 are provided, and the multiple hollow areas 11 are distributed along the circumferential direction of the annular body 1. Exemplarily, the multiple hollow areas 11 can be evenly spaced along the circumference of the annular body 1, or they can be non-uniformly distributed along the circumference according to the magnetic pole distribution and mechanical requirements, or they can be symmetrically distributed along the circumference.

[0043] There are gaps between adjacent hollow areas 11 to form a solid area 12 on the annular body 1. The solid area 12 is a high-density area of ​​material without hollowing, and its circumferential width and axial range can be designed according to the specific application scenario. The solid area 12 serves as the main load-bearing skeleton of the annular body 1 in the circumferential direction, ensuring the overall mechanical strength and assembly rigidity of the rotor 100.

[0044] In this configuration, the hollowed-out area 11 and the solid area 12 are alternately arranged on the annular main body 1, forming an integrated topological structure that deeply integrates the lightweight porous area and the high-density solid load-bearing area. The mesh structure within the hollowed-out area 11 completes the functions of weight reduction, moment of inertia reduction, and heat dissipation of the rotor 100; the solid area 12 ensures the structural rigidity and load-bearing reliability of the rotor 100. The two are periodically and compositely distributed, jointly forming a functionally coordinated integrated rotor skeleton.

[0045] In this embodiment of the invention, the permanent magnet 3 corresponds to the hollow area 11. That is, the installation position of the permanent magnet 3 on the inner wall of the annular body 1 corresponds radially to the hollow area 11. This arrangement allows the airflow to directly carry away the heat generated by the permanent magnet 3 when the rotor 100 rotates, significantly improving the heat dissipation efficiency of the back area of ​​the permanent magnet 3.

[0046] Furthermore, in this embodiment of the invention, the permanent magnet 3 covers the corresponding hollow area 11. That is, the mounting area of ​​the permanent magnet 3 on the inner wall of the annular body 1 completely covers the corresponding hollow area 11 in both the axial and circumferential directions. The permanent magnet 3 forms an inner shield for the hollow area 11, preventing external debris from directly intruding into the motor through the hollow area 11 and affecting the operation of internal components such as the permanent magnet 3 and the stator 4.

[0047] The following is a detailed explanation of the heat dissipation principle of rotor 100 during operation.

[0048] When the annular body 1 rotates at high speed, the air inside the concave mesh 21 of the mesh structure is subjected to centrifugal force and is thrown out radially. At the same time, new cold air is drawn in from the inside of the annular body 1 to replenish it, thereby forming a forced convection circulation inside the porous network. This achieves direct convection cooling of the back area of ​​the permanent magnet 3.

[0049] Furthermore, the numerous inner wall surfaces formed by multiple concave mesh holes 21 in the mesh structure provide a huge heat exchange area, further increasing the heat dissipation efficiency.

[0050] This utility model also provides a motor 200. Please refer to [link / reference]. Figure 3 and Figure 4 The motor 200 includes the rotor 100 of the above embodiments, as well as the stator 4, the supporting shaft 5, the bearing 6, the base 7 and the upper end cover 8.

[0051] The stator 4 is located inside the rotor 100, with an air gap between it and the annular body 1 of the rotor 100. The stator winding is embedded inside the stator 4. When the stator winding is energized, it generates an alternating rotating magnetic field, which produces an electromagnetic coupling force with the constant excitation magnetic field constructed by the permanent magnet 3, driving the rotor 100 to rotate and output electromagnetic torque.

[0052] The supporting shaft 5 is rigidly fixed on the base 7, providing an assembly positioning reference for the stator 4. At the same time, it serves as the bearing base for the inner ring of the bearing 6, ensuring the coaxiality of the assembly between the stator 4 and the rotor 100, and keeping the air gap of the motor 200 uniform and stable throughout the entire process.

[0053] The bearing 6 provides rotational support for the rotor 100 and its rotating components, such as the permanent magnet 3, ensuring smooth coaxial operation of the rotating parts along the support shaft 5. It also effectively reduces frictional losses and bears the radial and axial loads during the operation of the entire machine. For example, the bearing 6 can be a deep groove ball bearing, an angular contact ball bearing, or a tapered roller bearing, with the specific type selected based on the operating parameters of the motor 200, such as its speed and load.

[0054] The base 7 serves as the fixed load-bearing foundation for the entire motor 200, used to assemble and fix the motor 200 to the external equipment platform. It also provides a load-bearing reference for supporting the rotating shaft 5 and the stator 4, ensuring the installation stability and mechanical rigidity of the entire structure.

[0055] The upper cover 8 is used to seal the upper end of the cavity of the motor 200, to isolate external dust, impurities and other environmental factors from corroding the internal electromagnetic components and structural components. At the same time, it works in conjunction with the base 7 to complete the axial limit of the bearing 6, so as to constrain the axial position of the rotor 100 under all working conditions.

[0056] Since the motor 200 adopts all the technical solutions of the rotor 100 in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments. Further details are omitted here.

[0057] The type of motor 200 is not limited. For example, motor 200 can be an external rotor permanent magnet brushless DC motor, an external rotor permanent magnet synchronous motor, or an external rotor brushless AC motor, etc. Any motor that uses the rotor 100 of the above embodiments belongs to the motor 200 mentioned in this utility model. Motor 200 can be applied to application scenarios such as UAV propulsion systems, industrial robot joint drives, new energy vehicle wheel hub motors, electric aircraft power units, or precision servo control systems.

[0058] This utility model also provides a drive system, which includes the motor 200 described above. The specific structure of the drive system is as described in the above embodiments. Since this drive system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0059] For example, the drive system can be a propulsion drive system for a drone, a joint drive system for an articulated robot, or a wheel hub drive system for a new energy vehicle. In addition to the motor 200, the drive system may also include one or more of the following: an electronic speed controller, a reduction mechanism, a transmission mechanism, and a controller used in conjunction with the motor 200, to form a complete power output and control loop. Any drive system that includes the motor 200 of the above embodiments falls under the category of drive systems described in this utility model.

[0060] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A rotor, characterized in that, include: A ring-shaped main body has at least one hollow area with a mesh structure comprising multiple concave mesh holes. Each concave mesh hole includes connecting beams and arc-shaped beams. Two arc-shaped beams are arranged opposite each other and are both recessed into the concave mesh holes, giving the mesh structure a negative Poisson's ratio tensile mechanical property. Under load, the arc-shaped beams uniformly transmit stress through progressive bending deformation. The two ends of the two arc-shaped beams are connected by two connecting beams, forming the concave mesh holes. Multiple permanent magnets are disposed on the inner side of the annular body.

2. The rotor as claimed in claim 1, characterized in that, The concave mesh holes are arranged in multiple rows along the circumference of the annular body. Each row of concave mesh holes includes multiple concave mesh holes distributed along the axial direction of the annular body. The concave mesh holes in adjacent rows are staggered along the axial direction of the annular body.

3. The rotor as described in claim 2, characterized in that, Each of the connecting beams is connected at both ends to the middle of two adjacent arc-shaped beams, and the arc-shaped portion of the arc-shaped beam is spaced apart from the arc-shaped beams in the adjacent row.

4. The rotor as described in claim 3, characterized in that, The two ends of the connecting beam are respectively connected to the deepest recess of the two arc-shaped beams in the adjacent row.

5. The rotor as described in claim 2, characterized in that, The concave meshes in the same row and adjacent to each other share the same connecting beam.

6. The rotor as claimed in any one of claims 1 to 5, characterized in that, The hollowed-out areas are provided in multiple ways, and the multiple hollowed-out areas are distributed along the circumferential direction of the annular body. There are gaps between adjacent hollowed-out areas to form solid areas on the annular body.

7. The rotor as claimed in claim 6, characterized in that, The permanent magnet is positioned corresponding to the hollowed-out area.

8. The rotor as claimed in claim 7, characterized in that, The permanent magnet covers the corresponding hollow area.

9. An electric motor, characterized in that, Includes a rotor as described in any one of claims 1 to 8.

10. A drive system, characterized in that: Includes the motor as described in claim 9.

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