Novel permanent magnet wheel structure

Abstract

The utility model discloses a novel permanent magnet wheel structure which comprises a permanent magnet, and two magnetizer bodies are symmetrically arranged on the two sides of the permanent magnet. A first groove body is formed in the outer side of the magnetizer body, a shaft hole is formed in the middle of the magnetizer body, a mounting hole is formed in the magnetizer body and located between the shaft hole and the first groove body, and a second groove body is formed in the inner side of the magnetizer body. According to the novel permanent magnet wheel structure provided by the utility model, through the structural design, the size of the optimized magnetic wheel is smaller than or equal to that of the original magnetic wheel, and the size of the optimized magnetic force is larger than or equal to the magnetic adsorption force of the original magnetic wheel.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet wheels, in particular to a novel permanent magnet wheel structure. Background Art

[0002] Regarding magnetic adsorption, researchers have primarily studied permanent magnets and electromagnets. Permanent magnets are suitable for magnetically conductive walls, while electromagnets are not restricted by wall materials. Negative pressure adsorption uses negative pressure generated by the suction cup to adhere to the wall. This has the advantage of not being restricted by wall materials, but requires a high level of air pressure.

[0003] The permanent magnet wheel is composed of a permanent magnet and two conductive magnets on the left and right. The permanent magnet in the center is ring-shaped, and the conductive magnets on both sides are also ring-shaped. The permanent magnet wheel is symmetrical as a whole. The function of the permanent magnet is to provide magnetic adsorption force, and the function of the conductive magnets on both sides is to plan, guide and gather the lines of magnetic force of the permanent magnet, so that the magnetic field generated by the magnetic force lines emitted by the permanent magnet in the permanent magnet wheel is stronger and the magnetic attraction generated is greater.

[0004] The permanent magnets are made of NdFeB, a rare earth material with high residual magnetic induction and coercive force. The permanent magnets are made of N35 NdFeB and are magnetized using parallel magnetization. Due to its high magnetic product energy and coercive force, and its relatively low price, it is widely used.

[0005] Taking the wall-climbing robot as the research object, the adsorption force problem was studied. Based on the principle of permanent magnetic adsorption, the system simulation research was carried out using Maxwell electromagnetic simulation software. The influencing factors such as the thickness of the magnetic wheel's conductive magnet were optimized to find the optimal design solution.

[0006] The goal of optimization is to reduce the volume of the magnet. While reducing both mass and volume, the magnetic wheel's magnetic attraction to the steel wall must not be reduced. This is because the magnet is made of steel and is relatively heavy. Minimizing the weight of the magnetic wheel while allowing the cart to carry more items is crucial. To this end, this application proposes a novel permanent magnet wheel structure. Utility Model Content

[0007] Based on this, it is necessary to provide a new permanent magnet wheel structure to address the above technical problems. Through the structural design of the magnet body, the volume of the optimized magnetic wheel is less than or equal to the volume of the original magnetic wheel, and the magnitude of the optimized magnetic force is greater than or equal to the magnetic adsorption force of the original magnetic wheel.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A novel permanent magnet wheel structure is applied to permanent magnet wheel structures.

[0010] The novel permanent magnet wheel structure specifically includes:

[0011] A permanent magnet, wherein two magnet bodies are symmetrically arranged on both sides of the permanent magnet; a slot body 1 is provided on the outer side of the magnet body, an axial hole is provided in the middle of the magnet body, a mounting hole is provided on the magnet body and located between the axial hole and the slot body 1, and a slot body 2 is provided on the inner side of the magnet body.

[0012] As a preferred embodiment of the novel permanent magnet wheel structure provided by the present invention, there are multiple mounting holes, and the multiple mounting holes are arranged in a ring array.

[0013] As a preferred embodiment of the novel permanent magnet wheel structure provided by the present invention, the outer radius of the second groove body is 25 mm, the inner radius of the second groove body is 16 mm, and the depth of the second groove body is 5 mm.

[0014] As a preferred embodiment of the novel permanent magnet wheel structure provided by the present invention, the depth of the groove body 1 is 3 mm, the outer radius of the groove body 1 is 36-38 mm, and the inner radius of the groove body 1 is 28 mm.

[0015] As a preferred embodiment of the novel permanent magnet wheel structure provided by the present invention, the radius of the shaft hole is 16 mm.

[0016] As a preferred embodiment of the novel permanent magnet wheel structure provided by the present invention, the radius of the magnetizer body is 41 mm.

[0017] As a preferred embodiment of the novel permanent magnet wheel structure provided by the present invention, the inner diameter of the permanent magnet is 50 mm, the outer diameter of the permanent magnet is 80 mm, and the thickness of the permanent magnet is 6 mm.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The novel permanent magnet wheel structure provided by the utility model has a structure design of a magnetizer body, so that the volume of the optimized magnetic wheel is smaller than or equal to the volume of the original magnetic wheel, and the magnitude of the optimized magnetic force is greater than or equal to the magnetic adsorption force of the original magnetic wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the solutions in the present invention, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the overall structure of the new permanent magnet wheel after optimization of the structure provided by the utility model;

[0022] Figure 2 This is a side view of the overall structure of the new permanent magnet wheel provided by the utility model after optimization;

[0023] Figure 3 This is a cross-sectional view of the overall structure of the new permanent magnet wheel provided by the utility model after optimization;

[0024] Figure 4 This is a plan view of the original permanent magnetic wheel of the new permanent magnetic wheel structure provided by the utility model;

[0025] Figure 5 A planar side view of the original permanent magnetic wheel of the novel permanent magnetic wheel structure provided by the utility model;

[0026] Figure 6 A cross-sectional view of the main structure of the magnetizer after the new permanent magnet wheel structure is optimized provided by the utility model;

[0027] Figure 7 is a graph showing the change of variable $w length with magnetic force;

[0028] Figure 8 is a graph showing the change in length of variable $a with magnetic force;

[0029] Figure 9 is a graph showing the change of variable $e length with magnetic force;

[0030] Figure 10 This is a graph showing the change of $w length with magnetic force based on the optimization of variables $a and $e;

[0031] Figure 11 This is an enlarged view of the optimized broken line changes.

[0032] The markings in the figure are as follows:

[0033] 1. Magnetic conductor body; 2. Slot body 1; 3. Axis hole; 4. Mounting hole; 5. Slot body 2. DETAILED DESCRIPTION

[0034] In order to help those skilled in the art better understand the present invention, the following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0035] As described in the background art, factors such as the thickness of the magnetic conductor of the magnetic wheel and other influencing factors are optimized to seek the optimal design solution.

[0036] In order to solve this technical problem, the utility model provides a novel permanent magnet wheel structure, which is applied to the permanent magnet wheel structure.

[0037] Specifically, please refer to Figure 1 - Figure 3 , the novel permanent magnet wheel structure specifically includes:

[0038] Permanent magnet, two magnet bodies 1 are symmetrically arranged on both sides of the permanent magnet; a slot body 2 is opened on the outer side of the magnet body 1, an axial hole 3 is opened in the middle of the magnet body 1, a mounting hole 4 is opened on the magnet body 1 and located between the axial hole 3 and the slot body 2, and a slot body 2 is opened on the inner side of the magnet body 1.

[0039] The novel permanent magnet wheel structure provided by the present invention has a structure design of the magnetizer body 1, so that the volume of the optimized magnetic wheel is smaller than or equal to the volume of the original magnetic wheel, and the magnitude of the optimized magnetic force is greater than or equal to the magnetic adsorption force of the original magnetic wheel.

[0040] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0041] Initial setting of magnetic wheel structure:

[0042] Use Maxwell electromagnetic simulation software, start and create a new 3D project, execute the menu command Solution-Type, and select the Magnetostatic option.

[0043] The initial dimensions of the permanent magnet are set to an inner diameter of d = 50 mm, an outer diameter of D = 80 mm, and a thickness of A = 6 mm. Parallel magnetization is used. The guide magnets on both sides are cylindrical with an outer radius of r1 = 41 mm and a thickness of h1 = 8 mm. Because the magnetic wheel is mounted on the shaft, a circular hole with a radius of r2 = 16 mm needs to be left in the guide magnet. The volume of the guide magnet at this time is:

[0044] V1=π(r1-r2) 2 h1=3.14*(41 2 -16 2 )*8=35796mm 3

[0045] In order to ensure a secure installation, the magnetic wheel's conductive magnet must be provided with screw holes and nut holes. The radius of the screw hole is r3 = 2mm, and the depth is h1 = 8mm. The nut hole is located at the top of the screw hole and will overlap with part of the volume of the screw hole. The nut radius is r4 = 3mm, and the depth is h2 = 0.5mm. The volume of a single screw hole and nut hole is V2:

[0046]

[0047] The volume of a single magnet is:

[0048] V3=V1-4V2=35796-4*108.33=35362.68mm 3

[0049] The outer diameter of the conductive magnet needs to be slightly larger than that of the permanent magnet. This is to protect the permanent magnet and reduce wear on the permanent magnet. The conductive material is steel-1008. Since it is a steel structure, the surface is painted to prevent rust. In addition, due to wind and sun, the surface of the steel structure will have rust, which prevents the permanent magnet wheel from directly contacting the wall. Here, the air gap L = 0.5mm is set. The steel wall is replaced by a steel wall with a radius of 60mm and a thickness of 15mm. The material is steel-1008. The initial setting of the permanent magnet structure parameters is shown in the figure below. Figure 4 and Figure 5 shown.

[0050] Based on this structure, the electromagnetic simulation software Maxwell was used for simulation, and the force parameters of the wall were set to simulate the magnitude of the magnetic force generated by the permanent magnet of the magnetic wheel on the steel wall under the guidance of the magnetic lines of force by the guide magnet. On this basis, simulation was performed and the magnetic force parameters of the steel metal plate were set to simulate the magnitude of the magnetic force F1 = 402.53N on the steel plate surface.

[0051] The goal of optimization is to reduce the volume of the magnet. While reducing both mass and volume, the magnetic wheel's magnetic attraction to the steel wall must not be reduced. This is because the magnet is made of steel and is relatively heavy. Minimizing the weight of the magnetic wheel allows the cart to carry more items. In short, the volume of the optimized magnetic wheel must be less than or equal to the original volume, while the magnetic attraction must be greater than or equal to the original magnetic wheel's magnetic attraction.

[0052] Since the optimization of the permanent magnet wheel structure in this application primarily focuses on the magnets of the magnetic wheel, the permanent magnets remain unchanged, and all parameters remain the same as the original permanent magnets. The shape of the magnets was improved, and the axle portion with minimal correlation to the magnets and magnetic conductivity was simplified to reduce its volume. The shape of the portion with a greater correlation to magnetic conductivity was modified to further explore the impact of each component on magnetic conductivity.

[0053] Optimized rear magnetic wheel structure:

[0054] 1. Magnetic conductor body; 2. Slot body 1; 3. Axis hole; 4. Mounting hole; 5. Slot body 2.

[0055] Please refer to Figure 1 - Figure 3 , a new type of permanent magnet wheel structure, which includes:

[0056] Permanent magnet, wherein the inner diameter of the permanent magnet is 50mm, the outer diameter of the permanent magnet is 80mm, the thickness of the permanent magnet is 6mm, and two magnetizer bodies 1 are symmetrically arranged on both sides of the permanent magnet, wherein the radius of the magnetizer body 1 is 41mm; a groove body 2 is opened on the outside of the magnetizer body 1, wherein the depth of the groove body 2 is 3mm, the outer radius of the groove body 2 is 36-38mm, the inner radius of the groove body 2 is 28mm, and the magnetizer body 1 is provided with a plurality of grooves 2, 36-38mm, and the inner radius of the groove body 2 is 28mm. An axial hole 3 is provided in the middle of the main body 1, wherein the radius of the axial hole 3 is 16 mm, and a mounting hole 4 is provided on the magnetic conductive body 1 and located between the axial hole 3 and the slot body 1 2, wherein the number of the mounting holes 4 is multiple, and the multiple mounting holes 4 are arranged in a circular array, and a slot body 2 5 is provided on the inner side of the magnetic conductive body 1, wherein the outer radius of the slot body 2 5 is 25 mm, the inner radius of the slot body 2 5 is 16 mm, and the depth of the slot body 2 5 is 5 mm.

[0057] The side of the magnetizer body 1 in the permanent magnet wheel structure close to the permanent magnet is the inner side. A circular volume slot body 2 5 is designed to be removed from the wheel axle part, with an outer radius r5 = 25 mm, an inner radius r2 = 16 mm, and a depth h3 = 5 mm. A slot body 2 with a depth of h5 = 3 mm is opened on the outside of the magnetizer body 1 at a distance of h4 = 5 mm from the outer edge. The outer radius of the slot body 2 is r6 = 36 mm, and the inner diameter of the slot body 2 is r7 = 28 mm.

[0058] The volume removed from the inner side of the magnetizer body 1 is:

[0059]

[0060] The volume removed from the outside of the magnetizer body 1 is:

[0061]

[0062] The volume of a single magnetizer body 1 after preliminary optimization:

[0063] V 初优 =V1-V 内 -V 外1=35796-5793.3-4823.04=25179.66mm 3

[0064] After the optimization design, simulation data revealed that the optimized volume was smaller than the original volume, and the magnetic attraction of the optimized magnetic wheel to the steel wall was greater than the original magnetic attraction. This initially achieved the optimization goal, proving the optimization direction was correct. Further optimization is required to improve the magnetic attraction force / volume (mass) ratio and maximize the performance of the magnetic wheel.

[0065] In order to better study the influence of each key part of the magnet on the magnetic performance, the magnet body 1 is cross-sectioned, which makes it easier to set variables and observe the variables. Variables are set in these three parts of the magnetic wheel, such as Figure 6 shown.

[0066] In the Maxwell software, set three variables $w, $e, and $a. Then assign them to the variables Y, X, and Z respectively. Simulate each variable and observe the change in magnetic force when the variable changes. The simulation table is as follows:

[0067] Simulation variable setting parameter table

[0068]

[0069] Simulate each variable and observe the change of magnetic force when the variable changes. The simulation diagram is as follows: Figure 7-Figure 9 shown.

[0070] As can be seen from the image, among the three variables, the magnetic force increases the most when the $w variable increases by 1 mm. Therefore, the next step is to find the optimal parameter values ​​of $a and $e, and then increase the value of $w to increase the magnetic conductivity of the magnetic wheel. This maximizes the magnetic adsorption force while keeping the volume of the magnetizer body 1 no larger than that of the original magnetic wheel.

[0071] Further simulation experiments for parameter optimization: Figure 10-11 shown.

[0072] The simulation results show that this top-level line is based on the two optimal variables, $a and $e, and then observes the effect of changes in $w on the magnetic force. When $a = 7mm and $e = 5mm, these two variables reach their optimal state, forming the top-level line. The simulation results show that the line diverges at $w = 10, leading to a line optimized for $a = 9mm and $e = 10mm. However, with this parameter set, the volume of the magnetizer 1 increases dramatically, while the magnetic attraction of the magnetic wheel increases minimally. Therefore, the optimal set of parameters is $a = 7mm, $e = 5mm, and $w = 10mm.

[0073] After the second optimization, r6=36mm becomes r8=34mm.

[0074]

[0075] The volume of a single nut and screw hole is: V2 = 108.33 mm3

[0076] When $w is 9mm, $w increases by 5mm on the original volume, and the increased volume is ΔV:

[0077]

[0078] The optimized volume is:

[0079] V 最优 =V1-V 内 -V 外2 -4*V2+ΔV w

[0080] =35796-5793.3-3504.24-4*108.33+8242.5

[0081] =34307.64mm 3

[0082] V3=35362.68mm 3 <V 最优 =34307.64mm 3

[0083] Calculations show that the volume of the optimized magnetic wheel's magnetizer is smaller than that of the original, while its magnetic attraction is significantly greater. The optimized attraction reaches F2 = 516.74 N. While the magnetizer's volume is reduced, the magnetic attraction of the magnetic wheel to the steel wall increases by 114.53 N. This completes the optimization goal.

Claims

1. A new type of permanent magnet wheel structure, characterized in that: include: A permanent magnet, wherein two magnet bodies (1) are symmetrically arranged on both sides of the permanent magnet; a slot body (2) is provided on the outer side of the magnet body (1), an axial hole (3) is provided in the middle of the magnet body (1), a mounting hole (4) is provided on the magnet body (1) and located between the axial hole (3) and the slot body (2), and a slot body (5) is provided on the inner side of the magnet body (1).

2. The novel permanent magnet wheel structure according to claim 1 is characterized in that: There are a plurality of mounting holes (4), and the plurality of mounting holes (4) are arranged in a ring array.

3. The novel permanent magnet wheel structure according to claim 1 is characterized in that: The outer radius of the second groove body (5) is 25 mm, the inner radius of the second groove body (5) is 16 mm, and the depth of the second groove body (5) is 5 mm.

4. The novel permanent magnet wheel structure according to claim 1 is characterized in that: The depth of the groove body 1 (2) is 3 mm, the outer radius of the groove body 1 (2) is 36-38 mm, and the inner radius of the groove body 1 (2) is 28 mm.

5. The novel permanent magnet wheel structure according to claim 1 is characterized in that: The radius of the axial hole (3) is 16 mm.

6. The novel permanent magnet wheel structure according to claim 1 is characterized in that: The radius of the magnetic conductor body (1) is 41 mm.

7. The novel permanent magnet wheel structure according to claim 2 is characterized in that: The inner diameter of the permanent magnet is 50 mm, the outer diameter of the permanent magnet is 80 mm, and the thickness of the permanent magnet is 6 mm.

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