A single-air-gap inductor and electromagnetic detection and quantization device

Abstract

The present invention belongs to the field of inductance technology devices, and in particular relates to a single-air-gap inductor and an electromagnetic detection and quantification device. The single-air-gap inductor includes: a magnetic core, a magnetic conduction plate, and a coil winding. The coil winding is wound around the magnetic core. Two magnetic conduction plates are arranged at intervals and in parallel. The opposite ends of the magnetic core approach each other and are respectively connected to the two magnetic conduction plates, and the two magnetic conduction plates jointly define an air-gap notch. The present invention can prevent the magnetic field from diffusing into irrelevant areas, thereby improving the utilization efficiency of the magnetic field to achieve a more uniform magnetic field distribution at the air-gap notch.

Description

Technical Field

[0001] The present invention belongs to the field of inductance technology devices, and particularly relates to a single-air-gap inductor and an electromagnetic detection and quantification device. Background Art

[0002] An inductor is an electronic component used to store electromagnetic energy and resist changes in current. Together with resistors and capacitors, it forms a basic part of an electrical circuit. An inductor usually includes a coil winding and a magnetic core supported by magnetic material for generating inductance (also known as self-inductance). A commonly used inductor is a transformer.

[0003] A transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. Its main components include a primary coil, a secondary coil, and an iron core (magnetic core). In the iron core of a transformer, there are usually tiny gaps between the iron sheets of the core, and these gaps are called air gaps. The existence of air gaps results in an incomplete closed magnetic circuit in the transformer, thus affecting the magnetic resistance of the transformer. Magnetic resistance refers to the resistance encountered by a magnetic field when propagating in a magnetic circuit. Air gaps cause an increase in magnetic resistance, thereby affecting the magnetization and magnetic induction of the transformer. When the magnetic field in the iron core passes through the air gap, the distribution of the magnetic field at the air gap is non-uniform, which easily leads to magnetic leakage. Therefore, air gaps have an important impact on the performance and efficiency of transformers. In the field of transformers, when the air gap exceeds 2 mm, 50% of the energy at the air gap is lost, and magnetic leakage is more likely to occur. When the air gap increases to 3 mm, only 30% of the energy remains at the air gap. Usually, the width of the air gap in a transformer is only a few hundred micrometers, equivalent to the thickness of an A4 paper.

[0004] A CT scanning device (Computed Tomography) has a relatively large air gap similar to that of a transformer. A CT scanning device is a medical imaging technology that uses X-rays to project through the human body or an object at different angles and captures the information on a detector, and then reconstructs this information through a computer to generate detailed cross-sectional images. The CT scanning device has an air gap, and the air gap needs to meet the requirement for accommodating the human body, so the air gap width ranges from several hundred millimeters to even several thousand millimeters. A CT scanning device is a large-sized three-dimensional uniform magnetic field that needs to be powered by an external power supply and consumes a large amount of electricity.

[0005] Moreover, when using an inductor in cooperation with a target object, coils are usually arranged on opposite sides of the target object, and a magnetic core plate is arranged under each coil. In this way, a magnetic field is generated in cooperation with the coils. When it is necessary to reduce the size of the inductor, this structure of directly arranging coils on the target object is not conducive to operating on the target object, such as installing electrodes. Moreover, currently, there is no inductor whose air gap width dimension is between the air gap width of a transformer and the air gap width of a CT scanning device and can effectively reduce the magnetic leakage phenomenon at the air gap. Summary of the Invention

[0006] The purpose of the embodiment of the present application is to provide a single-air-gap inductor, aiming to solve the problem of how to reduce the magnetic leakage at the air gap notch while ensuring a certain air gap width.

[0007] To achieve the above purpose, the technical solution adopted in the present application is:

[0008] In the first aspect, a single-air-gap inductor is provided, which includes: a magnetic core, a magnetic conductive plate, and a coil winding. The coil winding is wound around the magnetic core. Two magnetic conductive plates are arranged at intervals and in parallel. The two ends of the magnetic core approach each other and are respectively connected to the two magnetic conductive plates, and the two magnetic conductive plates jointly define an air gap notch.

[0009] In some embodiments, the surface of the magnetic conductive plate is in mirror contact with the end surface of the magnetic core.

[0010] In some embodiments, the magnetic conductive plate includes a plurality of first sheets stacked in sequence, and the magnetic core includes a plurality of second sheets stacked in sequence. Any one of the second sheets is located between two adjacent first sheets, so that the two ends of the magnetic conductive plate respectively clamp the two ends of the magnetic core.

[0011] In some embodiments, the coil winding is wound at a position on the magnetic core away from the air gap notch, and the extension paths of the two magnetic conductive plates from the two ends of the magnetic core to the coil winding are the same.

[0012] In some embodiments, the extension path of one end of the magnetic core towards the other end is an arc.

[0013] In some embodiments, the magnetic core includes a first section where the coil winding is arranged, a second section connected to one of the magnetic conductive plates, and a third section connected to the other magnetic conductive plate. The two ends of the first section are respectively connected to the second section and the third section.

[0014] In some embodiments, the coil winding is wound around the central position of the first section.

[0015] In some embodiments, the second segment is a straight segment, and the length direction of the second segment is perpendicular to the plate surface of the corresponding magnetic conduction plate.

[0016] In some embodiments, the third segment is a straight segment, and the length direction of the third segment is perpendicular to the plate surface of the corresponding magnetic conduction plate.

[0017] In some embodiments, the second segment and the corresponding magnetic conduction plate are located in the same plane.

[0018] In some embodiments, the third segment and the corresponding magnetic conduction plate are located in the same plane.

[0019] In some embodiments, the second segment and the third segment are arranged in an outward expanding shape, and the distance between the second segment and the third segment gradually increases along the direction from the magnetic conduction plate to the first segment.

[0020] In some embodiments, the plate edges at the same end of the two magnetic conduction plates are respectively connected to the opposite ends of the magnetic core.

[0021] In some embodiments, the magnetic core is made of a first magnetic conduction material, the magnetic conduction plate is made of a second magnetic conduction material, and the magnetic permeability of the first magnetic conduction material is greater than that of the second magnetic conduction material.

[0022] In some embodiments, the distance between the two magnetic conduction plates is L, where L is greater than or equal to 2 mm and less than 10 mm, or L is greater than 10 mm and less than or equal to 50 mm.

[0023] In a second aspect, an electromagnetic detection and quantification device is provided, which includes the single-air-gap inductor.

[0024] The beneficial effect of the present application is that: by placing two magnetic conduction plates at the air-gap notch of the single-air-gap inductor, the magnetic flux generated by the coil winding in the magnetic core is guided through the magnetic conduction plates, and the two magnetic conduction plates can concentrate and guide the distribution of the magnetic field, making the magnetic field more concentrated in the area between the two magnetic conduction plates, reducing the leakage of the magnetic field, preventing the magnetic field from spreading to irrelevant areas, thereby improving the utilization efficiency of the magnetic field and achieving a more uniform magnetic field distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1It is a schematic diagram of the principle of the single-air-gap inductor provided by an embodiment of the present application;

[0027] Figure 2 It is a schematic diagram of the principle of the single-air-gap inductor provided by another embodiment of the present application;

[0028] Figure 3 It is a schematic diagram of the principle of the single-air-gap inductor provided by still another embodiment of the present application;

[0029] Figure 4 It is a schematic diagram of the principle of the single-air-gap inductor provided by yet another embodiment of the present application;

[0030] Figure 5 It is a schematic diagram of the principle of the single-air-gap inductor provided by still another embodiment of the present application;

[0031] Figure 6 It is a schematic diagram of the principle of the single-air-gap inductor provided by still another embodiment of the present application;

[0032] Figure 7 It is a schematic diagram of the principle of the electromagnetic detection and quantification device provided by an embodiment of the present application;

[0033] Figure 8 It is a schematic diagram of the principle of the electromagnetic detection and quantification device provided by another embodiment of the present application;

[0034] Figure 9 It is a schematic diagram of the principle of the electromagnetic detection and quantification device provided by still another embodiment of the present application.

[0035] Among them, each reference numeral in the figure:

[0036] 100, single-air-gap inductor; 200, magnetic core; 300, magnetic conductive plate; 400, coil winding; 201, air-gap notch; 210, first section; 220, second section; 230, third section; 401, water pipe; 500, detection and quantification circuit; 250, avoidance interval; Detailed implementation manners

[0037] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present application.

[0038] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component. The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. The terms "first" and "second" are only used for the purpose of convenient description, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. The meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0039] An inductor is an electronic component that operates based on the principle of electromagnetic induction and is mainly used to store electromagnetic energy and adjust the current in a circuit. The principle of the inductor is based on Faraday's law of electromagnetic induction, which states that a changing magnetic field can induce an electromotive force (voltage) in a closed circuit. When current passes through an electric coil (winding), the generated magnetic field changes with the change of the current, thereby generating an induced voltage in the electric coil. The operation of the inductor involves self-inductance and mutual inductance.

[0040] Self-inductance refers to the generation of an induced electromotive force in the coil winding itself when current passes through the coil winding of the inductor. Mutual inductance refers to the induced electromotive force generated in another adjacent winding when current passes through the winding of an inductor. When current passes through the winding of an inductor, a magnetic field is generated in the winding. This magnetic field stores electromagnetic energy, similar to the storage of electric charge in a capacitor. When the current changes, the energy of the magnetic field also changes accordingly.

[0041] An inductor with an air gap introduces one or more air gaps in the winding, which affects the distribution of the magnetic field at the air gap and the stored energy. The presence of the air gap causes the magnetic circuit not to be completely closed, thereby affecting the magnetic resistance of the inductor. Magnetic resistance refers to the resistance encountered by the magnetic field when propagating in the magnetic circuit. The air gap causes a break in the magnetic circuit. The magnetic permeability of air is lower than that of the magnetic core, and the magnetic field distribution at the air gap is non-uniform.

[0042] The single-air-gap inductor 100 provided in the embodiments of the present application can effectively improve the uniformity of the magnetic field strength at the air gap and effectively reduce the magnetic leakage phenomenon. The specific structure of the single-air-gap inductor 100 in the embodiments of the present application is as follows.

[0043] Please refer to Figures 1 to 3, embodiments of the present application provide a single air-gap inductor 100 and an electromagnetic detection and quantification device having the same. The single air-gap inductor 100 includes: a magnetic core 200, a magnetic conductive plate 300, and a coil winding 400. Both the magnetic core 200 and the magnetic conductive plate 300 are made of materials with good magnetic permeability. Two magnetic conductive plates 300 are arranged at intervals and in parallel. The two ends of the magnetic core 200 approach each other and are respectively connected to the two magnetic conductive plates 300, and the two magnetic conductive plates 300 jointly define an air-gap notch 201. It can be understood that the coil winding 400 is wound around the magnetic core 200. It can be understood that the coil winding 400 is wound around the outer side surface of the magnetic core 200 and is connected to a power source, so as to generate a magnetic field in the magnetic core 200, and the magnetic field is conducted through the magnetic core 200 to the air-gap notch 201. The two parallel magnetic conductive plates 300 can improve the uniformity of the magnetic field intensity distribution at the air-gap notch 201. It can be understood that the magnetic flux generated by the coil winding 400 is conducted through the magnetic core 200 to the magnetic conductive plate 300. The plate area of the magnetic conductive plate 300 is significantly larger than the cross-sectional area of the magnetic core 200, so that the magnetic flux is uniformly distributed on the two magnetic conductive plates 300, so that the magnetic field intensity at each position of the air-gap notch 201 is the same.

[0044] Please refer to Figures 1 to 3 , the single air-gap inductor 100 provided in this embodiment can not only define the air-gap notch 201 through two parallel magnetic conductive plates 300, but also guide the magnetic flux through the two magnetic conductive plates 300. And the two parallel magnetic conductive plates 300 can concentrate the magnetic field and guide the uniform distribution of the magnetic field, so that the magnetic field intensity has a high distribution consistency in the air-gap notch 201, thereby reducing the leakage of magnetic flux, preventing the magnetic field from spreading to irrelevant areas, improving the utilization efficiency of the magnetic field, and realizing a more uniform magnetic field distribution.

[0045] It can be understood that in the present application, by arranging two relatively parallel magnetic conductive plates 300, the consistency of the magnetic field intensity in the air-gap notch 201 is improved, so that the same magnetic field intensity can be generated with only a small excitation current, reducing the power consumption of the inductor, and it can work in an environment powered by a small-capacity battery, such as a No. 5 battery. It can be understood that improving the consistency of the magnetic induction intensity distribution at the air-gap notch 201 can avoid the magnetic flux density being higher in some areas of the magnetic circuit and lower in other areas, thereby avoiding non-uniform magnetization and local saturation, and thus reducing the coercive force. Moreover, the improvement of the uniformity of the magnetic field distribution at the air-gap notch 201 can also reduce the hysteresis loss and eddy current loss. When the magnetic flux density changes little near the air-gap notch 201, the magnetic core 200 can be prevented from entering the saturation state, thereby avoiding the increase of hysteresis loss and eddy current loss, and finally reducing the power consumption and energy consumption, so that the single air-gap inductor 100 meets the low-power requirements for outdoor use.

[0046] Optionally, when the single-air-gap inductor 100 is used in cooperation with the target object, the two magnetic conductive plates 300 are respectively located on both sides of the target object, so that at least part of the target object is located within the magnetic field, and the magnetic core 200 extends to one side of the target object for the coil winding 400 to be arranged. There is no need to directly place the coil winding 400 above the target object, enabling the coil winding 400 to have a certain distance from the target object, which is beneficial for operating on the target object, such as installing a motor, etc. Ultimately, it is beneficial for the miniaturization of the size of the single-air-gap inductor 100 and low cost.

[0047] It can be understood that the area of the end face of any end of the magnetic core 200 is much smaller than the area of the plate surface of the magnetic conductive plate 300, and the structural shapes of the two magnetic conductive plates 300 are the same.

[0048] Please refer to Figures 1 to 3 , in some embodiments, the plate surface of the magnetic conductive plate 300 is connected to the end face of the magnetic core 200, and a mirror contact is formed between the plate surface of the magnetic conductive plate 300 and the end face of the magnetic core 200. Optionally, the magnetic core 200 and the magnetic conductive plate 300 are made of amorphous alloy materials, such as nanocrystalline materials, thus having a smooth surface, making the plate surface of the magnetic conductive plate 300 for connecting the magnetic core 200 a smooth mirror surface, and the end face of the magnetic core 200 for connecting the magnetic conductive plate 300 also a smooth mirror surface.

[0049] The mirror contact between the end face of the magnetic core 200 and the plate surface of the magnetic conductive plate 300 has the following characteristics:

[0050] Maximize magnetic flux transfer: The smooth mirror surface can ensure that there is a minimum gap or avoid unevenness between the end face of the magnetic core 200 and the plate surface of the magnetic conductive plate 300, which helps to maximize the transfer of magnetic flux between the magnetic core 200 and the magnetic conductive plate 300, thereby improving the intensity and stability of the magnetic field.

[0051] Reduce losses: The smooth contact interface can reduce the contact losses between the magnetic core 200 and the magnetic conductive plate 300. The smaller contact resistance can reduce energy losses and improve efficiency. The smooth mirror surface can also reduce eddy current losses caused by magnetic field changes because the flow of eddy currents is blocked on the smooth surface, thereby reducing energy losses.

[0052] Optimize magnetic field distribution: The smooth mirror surface can better guide the magnetic field through the magnetic conductive plate 300, making the magnetic field more concentrated and uniformly pass through the air-gap notch 201, thereby improving the uniformity of the magnetic field at the air-gap notch 201 and the consistency of the magnetic field intensity at each position. The smooth mirror surface can ensure that the magnetic field distribution is better transmitted to the magnetic conductive plate 300, thereby enhancing the stability and consistency of the induced electromotive force.

[0053] Reduce magnetic field leakage: The smooth mirror surface can also reduce the magnetic field leakage, that is, prevent the magnetic field lines from escaping from the side of the magnetic conductive plate 300, thereby more effectively guiding the magnetic field through the air-gap notch 201.

[0054] Improve reliability: The smooth mirror surface can reduce the entry of dust, moisture or other external factors into the gap between the magnetic core 200 and the magnetic conduction plate 300, thereby reducing the possibility of corrosion, extending the service life and improving reliability. The smooth mirror surface can reduce the influence of external interference factors on the magnetic field on the magnetic conduction plate 300, thereby improving the sensitivity and stability of the single-air-gap inductor 100.

[0055] Please refer to Figure 6 , in some embodiments, the magnetic conduction plate 300 includes a plurality of first sheets 301 stacked in sequence, and the magnetic core 200 includes a plurality of second sheets 302 stacked in sequence. Any one of the second sheets 302 is located between two adjacent first sheets 301 so that both ends of the magnetic conduction plate 300 clamp both ends of the magnetic core 200 respectively.

[0056] Optionally, the materials of the first sheet 301 and the second sheet 302 can be ferromagnetic alloys. By processing the ferromagnetic alloy material into sheets and then stacking a plurality of sheets in sequence, the magnetic conduction plate 300 or the magnetic core 200 can be stacked. By clamping the first sheet 301 and the second sheet 302 alternately in sequence, that is, the second sheet 302 is clamped between two adjacent first sheets 301 or the first sheet 301 is clamped between two adjacent second sheets 302, the clamping connection between the magnetic conduction plate 300 and the magnetic core 200 can be realized.

[0057] Please refer to Figure 1 , in some embodiments, the extension path of one end of the magnetic core 200 towards the other end is an arc. That is, the magnetic core 200 is bent along an arc. The arc-shaped magnetic core 200 has the following characteristics:

[0058] Magnetic field closure: The arc-shaped magnetic core 200 can better form a complete closed magnetic circuit, so that the magnetic field lines form a closed loop inside the magnetic core 200.

[0059] Reduce magnetic leakage: Using the arc-shaped magnetic core 200 can better guide the magnetic field to conduct along the extension path of the magnetic core 200, reducing the possibility of magnetic leakage. The magnetic field is more likely to remain concentrated on the bent magnetic core 200, thereby improving the transfer efficiency of magnetic flux.

[0060] Improve magnetic field uniformity: Since the bent magnetic core 200 can better distribute the magnetic field, a more uniform magnetic field distribution can be generated. When the uniform magnetic field is conducted to the magnetic conduction plate 300, the distribution of the magnetic field conducted to the magnetic conduction plate 300 is also of the same size.

[0061] Size reduction: The bent magnetic core 200 can reduce the overall size to a certain extent, thereby achieving a higher magnetic flux density and induction effect in a limited space. Moreover, the structure of the arc-shaped magnetic core 200 is relatively simple, easy to manufacture and assemble, reducing production costs and manufacturing complexity.

[0062] In some embodiments, the coil winding 400 is wound at a position of the magnetic core 200 away from the air gap notch 201, and the two magnetic conduction plates 300 respectively extend along both ends of the magnetic core 200 to the coil winding 400 with the same extension path. Such a setting has the following characteristics:

[0063] Reduction of magnetic coupling loss: The increased distance between the coil winding 400 and the air gap notch 201 makes it difficult for the magnetic flux to form a closed path near the coil, thereby reducing the magnetic coupling loss, which is the energy loss generated by the interaction between the magnetic flux coils.

[0064] Reduction of the influence of the alternating magnetic field: Placing the coil winding 400 away from the air gap notch 201 helps reduce eddy current losses because it is more difficult for the magnetic field to form a closed loop near the coil winding 400, thereby avoiding the generation of eddy current losses by the alternating magnetic field around the magnetic conduction plates 300 and the magnetic core 200.

[0065] Reduction of external interference: The presence of the magnetic conduction plates 300 can isolate the interference between the coil winding 400 and the external environment to a certain extent. Therefore, the signal quality of the single air gap inductor 100 can be improved, and the influence of possible external interference can be reduced.

[0066] Please refer to Figures 2 to 4 , in some embodiments, the magnetic core 200 includes a first section 210, a second section 220, and a third section 230. The second section 220 and the third section 230 of the magnetic core 200 are respectively connected to both ends of the first section 210 of the magnetic core 200. The free ends of the second section 220 and the third section 230 of the magnetic core 200 are respectively connected to the two magnetic conduction plates 300, and the coil winding is located in the first section.

[0067] Optionally, the first section 210 can be a straight section or an arc section. The free ends of the second section 220 and the third section 230 are respectively connected to the two magnetic conduction plates 300, which can guide the magnetic flux to pass between the two magnetic conduction plates 300 and enhance the uniformity of the magnetic field at the air gap notch 201.

[0068] Improvement of magnetic flux transfer: The multi-section magnetic core 200 can provide a longer magnetic path, which helps increase the stable transfer of the magnetic flux within the magnetic core 200. By reasonably setting the sizes and connection methods of the first section 210, the second section 220, and the third section 230, the magnetic field distribution can be better controlled, and the magnetic core 200 can be adapted to different installation and use spaces. The size can be the length.

[0069] In some embodiments, the high magnetic permeability material is Permalloy, microcrystalline material or nanocrystalline material.

[0070] Optionally, Permalloy is a class of alloys composed of nickel (Ni) and iron (Fe), with excellent magnetic conductivity, especially high magnetic permeability and low coercivity. Permalloy includes nickel and iron, usually with nickel content between 75% and 80%, and the remaining part is iron. Sometimes it may also contain other trace elements. Permalloy has the following characteristics:

[0071] High magnetic permeability: Permalloy has extremely high magnetic permeability, which means it can effectively guide magnetic flux lines and make the magnetic field propagate more uniformly inside the material.

[0072] Low coercivity: The coercivity of Permalloy is very low, which means that the magnetic field strength required for magnetization and demagnetization is small. This makes it easier to achieve rapid magnetization and demagnetization processes in electromagnetic applications.

[0073] High saturation magnetic induction intensity: Permalloy has a high magnetic induction intensity when saturated magnetized, which means it can achieve a high magnetization level under a lower magnetic field.

[0074] Microcrystalline materials and nanocrystalline materials have excellent magnetic properties and magnetic conductivity. The "microcrystalline" and "nanocrystalline" in their names refer to their crystal structures, which endow them with excellent magnetic conductivity, low coercivity and high saturation magnetic induction intensity. Microcrystalline materials and nanocrystalline materials are mainly composed of iron (Fe)-based alloys, usually containing a small amount of elements such as silicon (Si) and boron (B). The addition of these elements and special heat treatment processes endow these materials with unique properties. Microcrystalline materials and nanocrystalline materials have the following characteristics:

[0075] High magnetic permeability: Microcrystalline materials and nanocrystalline materials have extremely high magnetic permeability, which can effectively guide magnetic flux lines, thus achieving a more uniform magnetic field distribution in electromagnetic components.

[0076] Low coercivity: The coercivity of these materials is very low, which means that the magnetic field strength required for magnetization and demagnetization is very small. This helps to achieve rapid magnetization and demagnetization processes in electromagnetic components.

[0077] High saturation magnetic induction intensity: Microcrystalline materials and nanocrystalline materials have a relatively high magnetic induction intensity when saturated magnetized, which enables them to achieve a high magnetization level under a lower magnetic field.

[0078] Due to the high magnetic permeability and excellent magnetic properties of microcrystalline materials and nanocrystalline materials, they can achieve higher efficiency and better performance in electromagnetic applications. The low coercivity and high saturation magnetic induction intensity of these materials make them particularly suitable for applications that require precise control of the magnetic field.

[0079] In some embodiments, the low magnetic permeability material is a pure iron material or a ferrite material.

[0080] Optionally, pure iron has the characteristics of rich resources and low cost.

[0081] The coercivity of pure iron is relatively high, and a relatively large magnetic field intensity is required during magnetization and demagnetization. The saturation magnetic induction intensity of pure iron is relatively low. At a given magnetic field intensity, the maximum magnetic induction intensity it can reach is small. The magnetic permeability characteristics of pure iron materials vary within the frequency range. At low frequencies, pure iron materials may exhibit high magnetic permeability, but as the frequency increases, the magnetic permeability may decrease. This is because at high frequencies, the propagation of magnetic flux lines is affected by more hysteresis and eddy current losses. In this application, the coil winding 400 can be connected to a high-frequency power supply.

[0082] Ferrite is a compound composed of iron (Fe) and oxygen (O) elements. Ferrite has magnetism and belongs to a kind of magnetic material, and it has the following characteristics:

[0083] Coercivity: The coercivity of ferrite is relatively low, which means that a relatively small magnetic field intensity is required during magnetization and demagnetization.

[0084] Saturation magnetic induction intensity: The saturation magnetic induction intensity of ferrite is also relatively low, which means that at a given magnetic field intensity, the maximum magnetic induction intensity it can reach is limited. Ferrite has various different crystal structures, such as magnetite structure and spinel structure, etc. These different structures may affect its magnetic properties. In practical applications, the appropriate type of ferrite can be selected according to needs to meet the required electromagnetic properties.

[0085] In one embodiment, the coil winding is wound around the center position of the first section 210, which helps to ensure the maximum contact between the coil winding 400 and the first section 210 of the high magnetic permeability material, improving the efficiency and performance of the single air-gap inductor 100. Since the first section 210 made of high magnetic permeability material can conduct magnetic flux better, placing the coil winding 400 at its center position can make the most of the characteristics of the high magnetic permeability material, thereby enhancing the magnetic induction intensity and response of the single air-gap inductor 100, helping to improve the sensitivity and accuracy of the single air-gap inductor 100. This arrangement can also reduce the magnetic resistance between the coil winding 400 and the low magnetic permeability material, reduce energy loss, and improve the efficiency of the single air-gap inductor 100.

[0086] It can also be understood that the target object to be measured is generally located between two magnetic conductive plates 300. The first section 210 is connected to the two magnetic conductive plates 300 through the second section 220 and the third section 230, so that there is a certain distance between the first section 210 and the target object. After the coil winding 400 is arranged on the first section 210, the coil winding 400 is far away from the magnetic conductive plates 300 and the target object, so that there is a certain working space between the target object and the coil winding 400. When the target object is used in cooperation with the single air-gap inductor 100, it is convenient to operate on the target object, such as connecting electrodes, etc., improving the convenience of operation and being able to adapt to target objects of different sizes.

[0087] Please refer to Figures 2 to 3 , in some embodiments, the second section 220 is a straight section, and the length direction of the second section 220 is perpendicular to the plate surface of the corresponding magnetic conductive plate 300, and / or the third section 230 is a straight section, and the length direction of the third section 230 is perpendicular to the plate surface of the corresponding magnetic conductive plate 300. It can be understood that both the second section 220 and the third section 230 are straight sections, or one of the second section 220 and the third section 230 is a straight section.

[0088] In this embodiment, both the second section 220 and the third section 230 are straight sections, and both the second section 220 and the third section 230 are arranged in the vertical direction, and the plate surfaces of the two magnetic conductive plates 300 are arranged in the horizontal direction. The second section 220 and the third section 230 are respectively perpendicular to the two magnetic conductive plates 300, so that the single air-gap inductor 100 has the following characteristics:

[0089] Improve magnetic field uniformity: By vertically placing the second section 220 and the third section 230, the magnetic field can be better guided through the two magnetic conductive plates 300 and the magnetic field leakage can be reduced, thereby improving the uniformity of the magnetic field at the air-gap notch 201.

[0090] Reduce magnetic field loss: Vertically placing the second section 220 and the third section 230 can reduce the friction and eddy current loss between the magnetic field and the magnetic conductive plates 300, thereby improving the stability of the magnetic field.

[0091] Please refer to Figure 4 , optionally, the second section 220 and the third section 230 are respectively connected to the two magnetic conductive plates 300, and the length directions of the second section 220 and the third section 230 are respectively parallel to the plate surfaces of the two magnetic conductive plates 300, so that the magnetic field distribution between the two magnetic conductive plates 300 is uniform.

[0092] Please refer to Figure 5, in some embodiments, the second section 220 and the third section 230 are arranged in an outwardly expanding shape, and the distance between the second section 220 and the third section 230 gradually increases in the direction from the magnetic conduction plate 300 towards the first section 210. The magnetic conduction plate 300 is horizontally arranged, the second section 220 and the third section 230 are located in a vertical plane, and there is an angle between the length direction of the second section 220 or the third section 230 and the plate surface of the magnetic conduction plate 300, and the angle is greater than zero and less than ninety degrees. Optionally, the second section 220 or the third section 230 is connected to the plate edge of the magnetic conduction plate 300, so that one end of the second section 220 or the third section 230 connected to the first section 210 expands outward, so that there is a certain avoidance interval 250 between the second section 220 and the third section 230. When placing an object between the two magnetic conduction plates 300, the avoidance interval 250 can facilitate the operation on the object, such as installing an electrode on the object, improving the convenience of the operation.

[0093] Please refer to Figure 3 , in some embodiments, the plate edges of the same ends of the two magnetic conduction plates 300 are respectively connected to the opposite ends of the magnetic core 200.

[0094] It can be understood that the second section 220 and the third section 230 are respectively connected to the plate edges of the two magnetic conduction plates 300, that is, the second section 220 and the third section 230 are respectively and simultaneously connected to the left ends of the two magnetic conduction plates 300, or are respectively and simultaneously connected to the right ends of the two magnetic conduction plates 300. Through this connection method, the single air-gap inductor 100 has the following characteristics:

[0095] Magnetic field control: By adjusting the position of the connection position of the second section 220 or the third section 230, the magnetic field intensity in a specific area of the corresponding magnetic conduction plate 300 can be controlled. This flexibility enables the distribution of the magnetic field between the two magnetic conduction plates 300 to be optimized according to specific needs to meet the accuracy and sensitivity requirements of the single air-gap inductor 100 in different application scenarios.

[0096] Space saving: Connecting the second section 220 or the third section 230 to the edge of one end of the magnetic conduction plate 300 can leave more space at the other end of the magnetic conduction plate 300 and the central area of the magnetic conduction plate 300 for arranging other components or devices, so as to realize more complex circuit installation and setting in a limited space.

[0097] Magnetic core 200 protection: By connecting to the edge of the magnetic conduction plate 300, excessive magnetic fields introduced in the central area of the magnetic conduction plate 300 can be avoided, thereby reducing the excessive magnetic field influence that the magnetic core 200 may receive at the center and improving the stability and service life of the magnetic core 200.

[0098] Please refer to Figure 2In some embodiments, the centers of the two magnetic conductive plates 300 are respectively connected to the opposite ends of the magnetic core 200. It can be understood that the second section 220 and the third section 230 are respectively connected to the centers of the two magnetic conductive plates 300, so that the single air gap inductor 100 has the following characteristics through this connection method:

[0099] Improved uniformity: The second section 220 or the third section 230 is connected to the center of the corresponding magnetic conductive plate 300, so that a more uniform magnetic field distribution can be achieved. Since the second section 220 or the third section 230 is connected to the center of the magnetic conductive plate 300, it will guide the magnetic flux to be evenly distributed and pass through the magnetic conductive plate 300 without deflecting to one side or one end of the magnetic conductive plate 300, thereby making the magnetic field distribution between the two magnetic conductive plates 300 more uniform.

[0100] Since the connection position of the second section 220 or the third section 230 is located at the center of the magnetic conductive plate 300, the magnetic field on the magnetic conductive plate 300 is distributed from the center to the surroundings, and no obvious magnetic field gradient will appear. The second section 220 or the third section 230 is connected to the center of the magnetic conductive plate 300, which can provide a shorter magnetic flux path. A shorter magnetic flux path can reduce energy loss and magnetic leakage during magnetic field transmission, and further enhance the uniformity of the magnetic field.

[0101] Reducing magnetic field interference: The second section 220 or the third section 230 connected to the center of the magnetic conductive plate 300 can make the magnetic field more uniformly distributed in the detection area, thereby reducing the magnetic field interference in the non-detection area, thereby improving the accuracy and stability of the single air gap inductor 100.

[0102] Structural stability: By connecting the second section 220 or the third section 230 to the center of the magnetic conductive plate 300, the structural stability of the single air-gap inductor 100 can be increased. This can reduce the problem of uneven magnetic field distribution caused by structural deformation or looseness, and ensure the stability and reliability of the performance of the single air-gap inductor 100 during long-term use.

[0103] See also Figures 2 to 4 In some embodiments, the magnetic core 200 is made of a first magnetic conductive material, and the magnetic conductive plate 300 is made of a second magnetic conductive material, and the magnetic permeability of the first magnetic conductive material is greater than the magnetic permeability of the second magnetic conductive material.

[0104] Optionally, the first magnetic conductive material is a high magnetic permeability material, which may be a Permalloy, a microcrystalline material, or an ultramicrocrystalline material.

[0105] Optionally, the second magnetic conductive material is a low magnetic permeability material, which may be a pure iron material or a ferrite material.

[0106] By making the magnetic core 200 of a first magnetic conductive material and the magnetic conductive plate 300 of a second magnetic conductive material, the single air-gap inductor 100 has the following characteristics:

[0107] Magnetic field regulation: By selecting appropriate materials for the magnetic core 200 and the magnetic conductive plate 300, the conduction and distribution of the magnetic field can be adjusted. The magnetic core 200 with high magnetic permeability can enhance the concentration and conduction effect of the magnetic field, while the magnetic conductive plate 300 with low magnetic permeability can weaken the propagation of the magnetic field, thereby adjusting the uniformity of the magnetic field distribution and making the magnetic field intensity between the two magnetic conductive plates 300 uniformly high.

[0108] Magnetic field concentration effect: The magnetic core 200 with high magnetic permeability will attract and concentrate the magnetic field, making it more concentrated at the air-gap notch 201. This can enhance the intensity of the magnetic field within the air-gap notch 201, thereby improving the sensitivity and accuracy of the device.

[0109] Structural optimization: By optimizing the material selection of the magnetic core 200 and the magnetic conductive plate 300, a more uniform and stable magnetic field distribution can be achieved. Using the magnetic conductive plate 300 with low magnetic permeability can also reduce costs.

[0110] Please refer to Figures 2 to 4 , it can be understood that the coil winding 400 is wound around the magnetic core 200, that is, the coil winding 400 is wound around the magnetic core 200 made of a high magnetic permeability material and becomes the generator of the main magnetic flux. Since the magnetic permeability of the magnetic core 200 is high, the leakage magnetic flux will be reduced. As the magnetic circuit extends, the end face of the magnetic core 200 and the plate surface of the magnetic conductive plate 300 are in mirror contact, and the high magnetic permeability material contacts the low magnetic permeability material. The magnetic core 200 made of a high magnetic permeability material conducts the magnetic flux to the magnetic conductive plate 300 made of a low magnetic permeability material, and at the air-gap notch 201, the obtained induced electromotive force value is the highest. And the cross-sectional area of the magnetic core 200 with high magnetic permeability is smaller than the area of the magnetic conductive plate 300 with low magnetic permeability, which can make more magnetic flux gather on the magnetic conductive plate 300, so that the magnetic field intensity at each position between the two magnetic conductive plates 300 is consistent.

[0111] Optionally, the cross-sectional shape of the magnetic core 200 is circular, polygonal or convex circular.

[0112] Please refer to Figures 2 to 4 , optionally, the second magnetic conductive material is a high remanence material, which is beneficial to reducing the power consumption of the power supply. In the high-frequency single air-gap inductor 100, the large single air-gap notch 201 is often divided into several small air-gap notches 201, and the small air-gap notches 201 adopt different distribution methods to reduce the leakage magnetic flux. In this embodiment, a single air-gap notch 201 is adopted, and a power supply with a frequency range of 1 - 20 KHz is used. Combined with appropriate structural dimensions and appropriate magnetic conductive materials, the combined magnet obtains the best matching effect, and the reduction of the leakage magnetic flux is also achieved.

[0113] Select a suitable thickness for low magnetic permeability. When the thickness of the magnetic conductive plate 300 is relatively thin, a relatively uniform magnetic circuit distribution can be obtained. Optionally, in this embodiment, the thickness range of the magnetic conductive plate 300 is 0 to 1 mm, such as 0.2 mm, 0.5 mm or 1 mm, which can be selected according to the actual situation and is not limited here.

[0114] Please refer to Figures 2 to 5 , the single air-gap inductor 100 provided in this embodiment can obtain a large inductance value at lower power consumption and smaller current. The large single air-gap design can be used as the single air-gap inductor 100 within a certain frequency range. The space of the single air-gap is large enough, from a few millimeters to dozens of millimeters (<100 mm), and a uniform magnetic field can be generated, and it can be used as a provider that needs to provide a uniform magnetic field in the use environment.

[0115] Please refer to Figure 1 , in some embodiments, the distance between the two magnetic conductive plates 300 is L, and the range of L is greater than or equal to 2 mm and less than 10 mm, or the range of L is greater than 10 mm and less than or equal to 50 mm. It can be understood that L can be 5 mm, 12 mm or 40 mm, which is not limited here and can be selected according to the actual situation.

[0116] In some embodiments, the magnetic conductive plate 300 is a rectangular plate, and its length and width are a and b respectively, where the value range of a is L < a < 50 mm, and the value range of b is: 5 mm < b < 20 mm.

[0117] Optionally, the value of L is 12 mm, the value of a is 45 mm, and the value of b is 15 mm, thereby defining the size of the air-gap notch 201 as a cuboid region of 12 mm * 45 mm * 15 mm.

[0118] Please refer to Figures 7 to 9 , the present invention also proposes an electromagnetic detection and quantification device. The electromagnetic detection and quantification device includes a single air-gap inductor 100. The specific structure of the single air-gap inductor 100 refers to the above embodiment. Since this electromagnetic detection and quantification device adopts all the technical solutions of the above all embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0119] According to Faraday's law of electromagnetic induction, when a conductor makes a cutting magnetic force movement in a magnetic field, an induced electromotive force will be generated at both ends. During the transmission of current, the magnetic field direction generated in the conductor and the current conduction direction are in a perpendicular intersection state. As long as the conductor continuously cuts the magnetic force lines and keeps the magnetic field direction and the current conduction direction perpendicular and unchanged, the induced electromotive force will always exist.

[0120] The working principle of the electromagnetic detection and quantification device is based on the above-mentioned Faraday's law of electromagnetic induction. When a conductive liquid passes through a magnetic field, an induced voltage is generated on the liquid. The magnitude of the voltage is proportional to the flow rate of the liquid, the length of the liquid, and the magnetic field strength.

[0121] Please refer to Figures 7 to 9 , the electromagnetic detection and quantification device can be used to detect a target object and quantify the detection result, where the target object can be a water pipe 401. The water pipe 401 is located between two magnetic conductive plates 300, so that the electromagnetic detection and quantification device can detect the flow rate of the liquid in the water pipe 401 and conduct quantitative analysis on the magnitude of the flow rate. It can be understood that since the air gap notch 201 provided in the embodiment of the present application has a relatively large spacing L, the size of the water pipe 401 can be enlarged, which is convenient for operating on the water pipe 401, such as coating the inner wall of the water pipe 401 with a lining for protecting the water pipe 401.

[0122] It can be understood that the electromagnetic detection and quantification device further includes a detection and quantification circuit 500. The detection and quantification circuit 500 is connected to the coil winding 400.

[0123] The above are only optional embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A single-air-gap inductor, characterized in that, Comprising: A magnetic core, a magnetic conduction plate, and a coil winding. The coil winding is wound around the magnetic core. Two magnetic conduction plates are arranged at intervals and in parallel. The opposite ends of the magnetic core approach each other and are respectively connected to the two magnetic conduction plates, and the two magnetic conduction plates jointly define an air gap notch. The magnetic field is conducted through the magnetic core to the air gap notch. The magnetic core is made of a first magnetic conduction material, the magnetic conduction plate is made of a second magnetic conduction material, the magnetic permeability of the first magnetic conduction material is greater than that of the second magnetic conduction material. The plate edges at the same end of the two magnetic conduction plates are respectively connected to the opposite ends of the magnetic core, and the cross-sectional area of the magnetic core is smaller than the area of the magnetic conduction plate.

2. The single air-gap inductor according to claim 1, wherein: The plate surface of the magnetic conduction plate is in mirror contact with the end surface of the magnetic core.

3. The single air-gap inductor according to claim 1, wherein: The magnetic conduction plate includes a plurality of first sheets arranged in sequence and stacked, and the magnetic core includes a plurality of second sheets arranged in sequence and stacked. Any one of the second sheets is located between two adjacent first sheets, so that the two ends of the magnetic conduction plate respectively clamp the two ends of the magnetic core.

4. The single-air-gap inductor according to claim 1, wherein: The coil winding is wound at a position of the magnetic core away from the air gap notch, and the extension paths of the two magnetic conduction plates from the two ends of the magnetic core to the coil winding are the same.

5. The single air-gap inductor according to any one of claims 1-4, characterized in that: The extension path of one end of the magnetic core towards the other end is an arc.

6. The single air-gap inductor according to any one of claims 1-4, characterized in that: The magnetic core includes a first section where the coil winding is arranged, a second section connected to one of the magnetic conduction plates, and a third section connected to the other magnetic conduction plate. The two ends of the first section are respectively connected to the second section and the third section.

7. The single air-gap inductor according to claim 6, wherein: The coil winding is wound around the central position of the first section.

8. The single air-gap inductor according to claim 6, wherein: The second section is a straight line segment, and the length direction of the second section is perpendicular to the plate surface of the corresponding magnetic conduction plate.

9. The single air-gap inductor according to claim 6, wherein: The third section is a straight line segment, and the length direction of the third section is perpendicular to the plate surface of the corresponding magnetic conduction plate.

10. The single-air-gap inductor according to claim 6, wherein: The second section and the corresponding magnetic conduction plate are in the same plane.

11. The single air-gap inductor according to claim 6, wherein: The third section and the corresponding magnetic conduction plate are in the same plane.

12. The single-air-gap inductor according to claim 6, wherein: The second section and the third section are arranged in an outward expanding shape, and the distance between the second section and the third section gradually increases along the direction from the magnetic conduction plate to the first section.

13. The single-air-gap inductor according to any one of claims 1-3, characterized in that: The first magnetic conduction material is permalloy, microcrystalline material or nanocrystalline material; the second magnetic conduction material is pure iron material or ferrite material.

14. The single-air-gap inductor according to any one of claims 1-4, characterized in that: The distance between the two magnetic conduction plates is L, and L is greater than or equal to 2 mm and less than 10 mm, or L is greater than 10 mm and less than or equal to 50 mm.

15. The single air-gap inductor according to claim 14, wherein: The shape of the magnetic conduction plate is rectangular, and the length range of the magnetic conduction plate is L - 50 mm, and the width range of the magnetic conduction plate is 5 - 20 mm.

16. An electromagnetic detection and quantification device, characterized in that, Including the single-air-gap inductor according to any one of claims 1 - 15.

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