Angle detection device

Abstract

The utility model provides an angle detection device. The angle detection device comprises a rotating shaft; the magnet is arranged on the rotating shaft and rotates along with the rotating shaft; and the Hall chip detection element is arranged on one side of the magnet. By arranging the magnet on the rotating shaft, detecting the variable quantity of the magnetic field intensity of the magnet through the Hall chip detection element and further converting the relationship between the magnetic field intensity and the angle variable quantity, the rotating angle of the rotating shaft is determined, and the shape of the magnet is further set, so that the change of the magnetic field of the magnet is conveniently judged; compared with a traditional magnet structure, the structure is simpler, and the detection structure is more accurate.

Description

Technical Field

[0001] This application relates to a detection device, and more particularly to an angle detection device. Background Technology

[0002] Existing magnetic angle sensors typically consist of one or more combinations of permanent magnets and Hall effect chip detection units. The Hall effect chip detects the magnetic field strength of the non-uniform magnetic field around the permanent magnet, and the angle change is calculated by the chip processor. The permanent magnet usually uses a bipolar magnet, and the magnetic field around it is non-uniformly distributed, which easily leads to low accuracy in repeatable measurements. Utility Model Content

[0003] This application provides an angle detection device to solve the problems existing in related technologies. The technical solution is as follows:

[0004] This application provides an angle detection device, including:

[0005] Rotation axis;

[0006] A magnet is mounted on a rotating shaft and rotates with the rotating shaft.

[0007] Hall effect chip detection element, which is located on one side of the magnet.

[0008] In one implementation, it further includes:

[0009] A fixing component is located below the Hall chip detection element.

[0010] In one implementation,

[0011] The cross-section of the magnet has a vortex-shaped structure.

[0012] In one implementation,

[0013] The thickness of the magnet is 1-5mm.

[0014] In one implementation,

[0015] The magnetic poles of the magnet are aligned with the wall thickness, and the wall thickness increases linearly along the circumference from the vortex initiation point to the puncture point.

[0016] In one implementation,

[0017] The Hall chip detection element is horizontally centered and fixed within a distance of 1 to 5 mm from the radial outer circumference of the magnet.

[0018] In one implementation,

[0019] The magnetic field strength distribution of the magnet is either N pole or S pole.

[0020] In one implementation,

[0021] The edges and corners of the magnet are not chamfered.

[0022] In one implementation,

[0023] The magnet is one of the following: flexible magnet, bonded magnet, or sintered magnet.

[0024] The advantages or beneficial effects of the above technical solutions include at least the following:

[0025] By placing a magnet on a rotating shaft, the change in the magnetic field strength of the magnet is detected by a Hall chip detection element, and the relationship between the magnetic field strength and the change in angle is further calculated to determine the rotation angle of the rotating shaft. This application further sets the shape of the magnet, which facilitates the judgment of the change in the magnetic field of the magnet and the judgment of the rotation angle of the rotating shaft. Compared with the traditional magnet structure, the structure is simpler and the detection structure is more accurate.

[0026] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0027] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0028] Figure 1 This is a schematic diagram of the structure of this utility model;

[0029] Figure 2 This is a top view of the magnet's structure.

[0030] Figure 3 This is a schematic diagram of the magnetic field strength distribution of a magnet;

[0031] Figure 4 This is a graph showing the theoretical relationship between the magnetic field strength of an angle sensor and the angle.

[0032] Figure 5 This is a top view of the magnet's structure.

[0033] Figure 6 This is a schematic diagram of a magnet located in a rectangular coordinate system.

[0034] Figure 7 This is a schematic diagram of the structure between the magnet, the rotating shaft, and the Hall chip detection element.

[0035] Figure 8 This is a schematic diagram of the initial state structure between the magnet and the Hall chip detection element;

[0036] Figure 9 This is a schematic diagram of the rotational structure between the magnet and the Hall chip detection element;

[0037] In the diagram: 1. Rotating shaft; 2. Magnet; 3. Hall effect chip detection element; 4. Fixed component. Detailed Implementation

[0038] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0039] Figures 1-9 This diagram illustrates the structure of an angle detection device according to an embodiment of this application. Figures 1-9 As shown, the detection device may include:

[0040] Rotation axis 1;

[0041] Magnet 2 is mounted on rotating shaft 1 and rotates with rotating shaft 1.

[0042] Hall chip detection element 3 is disposed on one side of magnet 2.

[0043] In this embodiment, the rotating shaft 1 can rotate axially and is coaxially assembled with the central hole of the magnet 2. The rotation angle change of the rotating shaft 1 is determined by the rise and fall of the magnetic field strength of the magnet 2. When the rotating shaft 1 rotates, the magnet 2 changes the relative distance with the Hall chip detection element 3. The Hall chip detection element 3 can determine the rotation angle of the rotating shaft 1 by detecting this change in magnetic field strength and further calculating the relationship between magnetic field strength and angle change.

[0044] Furthermore, the Hall chip detection element 3 is horizontally centered and fixed within a distance of 1 to 5 mm from the radial outer periphery of the magnet 2;

[0045] The distance from the Hall chip detection element 3 to the axis of the rotating shaft 1 is the distance from the Hall chip detection element 3 to the outer side of the magnet 2 plus the distance of the pole diameter at the corresponding position of the magnet 2.

[0046] The formula for the distance from Hall chip detection element 3 to the center of rotation axis 1 is:

[0047] d = L +r

[0048] Where d is the distance from the Hall chip detection element 3 to the center of the rotation axis 1. L The distance from the Hall chip detection element 3 to the outside of the magnet 2.

[0049] In this embodiment, the magnet 2 is fixedly mounted on the rotating shaft 1 component, and the Hall chip detection element 3 is mounted on the fixed component 4. The distance between the Hall chip detection element 3 and the outer periphery of the vortex magnet 2 is [missing information]. L Therefore, it can be seen that the distance from the Hall chip detection element 3 to the axis of the rotating shaft 1 is the distance from the Hall chip detection element 3 to the outer side of the magnet 2 plus the distance of the pole diameter at the corresponding position of the magnet 2.

[0050] The initial angle of rotation axis 1 is θ0 = 0. Rotation axis 1 rotates by an angle θ1. At this time, the distance between the Hall chip detection element 3 and the outer side of the magnet 2 is... L 0 becomes L 1. At this time, the magnetic field strength detected by Hall chip detection element 3 changes from B0 to B1;

[0051] Because the magnetic field strength B detected by the Hall chip detection element 3 is related to the distance... L It has a positive correlation, that is: B = k × L , through d= L +r, r=a+b×θ, from which we can deduce:

[0052]

[0053] Where a and b are constants, k is a constant, and d is a fixed value.

[0054] Furthermore, the rotation angle value can be expressed as:

[0055]

[0056] In this embodiment, a≥0, b≥0, d≥0, and ΔB is the change in magnetic field strength;

[0057] By placing magnet 2 on rotating shaft 1, the change in magnetic field strength of magnet 2 is detected by Hall chip detection element 3, and the relationship between magnetic field strength and angle change is further calculated to determine the rotation angle of rotating shaft 1. This application further sets the shape of magnet 2, which facilitates the judgment of changes in magnetic field of magnet 2 and the judgment of rotation angle of rotating shaft 1. Compared with the traditional magnet 2 structure, the structure is simpler and the detection structure is more accurate.

[0058] like Figure 1 In one embodiment, the method further includes:

[0059] Fixing component 4 is located below Hall chip detection element 3.

[0060] In this embodiment, the fixing component 4 is used to support and fix the Hall chip detection element 3. When the rotating shaft 1 rotates, the magnet 2 will change its relative distance with the Hall chip detection element 3. The Hall chip detection element 3 can determine the angle of the rotating shaft 1 relative to the fixing component 4 by detecting the change in magnetic field strength and further calculating the relationship between magnetic field strength and angle change.

[0061] like Figures 1-2 and Figures 5-9 As shown, in one embodiment,

[0062] The cross-section of magnet 2 has a vortex-shaped structure.

[0063] In this embodiment, the magnet 2 is integrally processed from permanent magnet material, has a vortex structure, a thickness of 1-5mm, the magnetic pole direction is the wall thickness direction, the wall thickness dimension increases linearly from the vortex start point to the end point along the circumference, and its magnetic field strength distribution has a unique linear relationship (the circumference is of the same polarity, both are N poles or S poles).

[0064] By setting the magnet 2 as a vortex magnet 2 structure, its magnetic field strength is linearly and uniformly distributed, and has a unique linear relationship with the angle within the rotation period. The signal processing is simple, the anti-interference ability is stronger, the detection results are more stable, and it has excellent angle repeatability detection accuracy.

[0065] Furthermore, the top view of magnet 2 is similar in shape to the top view of a snail shell;

[0066] The vortex magnet 2 is magnetized by a radial magnetizing coil. The magnetic field generated by the radial magnetizing coil will cause the magnetic domains inside the vortex magnet 2 to rotate, thereby making the outer periphery of the vortex magnet 2 exhibit a uniformly distributed magnetic field strength.

[0067] Specifically, the magnetic field exhibits a single polarity (N pole or S pole) along the outer periphery of the vortex magnet 2, while it exhibits the opposite polarity (S pole or N pole) at the center or the inner periphery of the central hole.

[0068] like Figures 1-2 As shown, in one embodiment,

[0069] Magnet 2 has a chamfered corner structure.

[0070] In this embodiment, the magnet 2 is processed by molding, injection molding or wire cutting, which is suitable for industrial mass production, with high efficiency and good product consistency.

[0071] like Figures 1-2 and Figures 5-9 As shown, in one embodiment,

[0072] Magnet 2 is one of the following: flexible magnet, bonded magnet, or sintered magnet.

[0073] In this embodiment, the material of the magnet 2 can be selected from various forms such as flexible magnet, bonded magnet, sintered magnet, etc., depending on the application scenario. The molding process is different for each type of magnet, and the magnetic field strength of the magnet 2 of the same size is also different.

[0074] Magnetization and energy enhancement: Magnet 2 is radially magnetized, so that the magnetic field strength has a unique linear relationship in the circumferential direction.

[0075] plan Material selection Molding process 1 Flexible magnet Compression molding 2 Sintered magnets Wire EDM forming 3 Bonded magnets Compression molding / injection molding

[0076] like Figures 5-9 As shown, during the processing of magnet 2,

[0077] Construct a rectangular coordinate system. The X-axis and Y-axis on the coordinate system correspond to the first preset constant and the second preset constant, respectively. The polar radius of magnet 2 moves with the origin of the coordinate system as one end. The angle between the polar radius and the X-axis is the polar angle. The path of the polar radius is the product of the first preset constant, the second preset constant, and the polar angle.

[0078] The formula for the processed shape of magnet 2 is:

[0079] r = a + b × θ

[0080] Where r represents the polar radius (r≥0), θ represents the polar angle (θ≥0), and a and b are constants (a≥0, b≥0), which control the position, size, and shape of the vortex curve, respectively. Adjusting the value of the constant a can shift the starting point of the curve outward by a units (a≥0).

[0081] Assuming a = 1 and b = 1, the equation becomes r = 1 + θ. Its characteristic is that, starting from a distance of 1 mm from the pole, the polar radius r also increases uniformly with the uniform increase of the polar angle. When θ = 0, r = 1; when θ = 2π, r = 1 + 2π; when θ = 4π, r = 1 + 4π.

[0082] The functions of each module in each device of this utility model embodiment can be found in the corresponding description in the above method, and will not be repeated here.

[0083] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0085] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An angle detection device, characterized in that, include: Rotation axis; A magnet is disposed on the rotating shaft and rotates with the rotating shaft. The cross-section of the magnet has a vortex structure. The magnetic pole direction of the magnet is the wall thickness direction, and the wall thickness increases linearly along the circumference from the vortex start point to the end point. A Hall chip detection element is disposed on one side of the magnet.

2. The angle detection device according to claim 1, characterized in that, Also includes: A fixing component is disposed below the Hall chip detection element.

3. The angle detection device according to claim 1, characterized in that, The thickness of the magnet is 1-5 mm.

4. The angle detection device according to claim 1, characterized in that, The Hall chip detection element is horizontally centered and fixed within a distance of 1-5 mm from the radial outer circumference of the magnet.

5. The angle detection device according to claim 1, characterized in that, The magnetic field strength distribution of the magnets is either N pole or S pole.

6. The angle detection device according to claim 1, characterized in that, The magnet has a chamfered corner structure.

7. The angle detection device according to claim 1, characterized in that, The magnet is one of the following: a flexible magnet, a bonded magnet, or a sintered magnet.

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