Inductor and handwriting pen

Abstract

The inductor comprises a magnetic core and a plurality of winding coils, the magnetic core is provided with a plurality of partition plates, the partition plates are arranged at intervals in the axial direction of the magnetic core, and a winding groove is formed between every two adjacent partition plates; the number of the winding coils corresponds to the number of the winding grooves, and the winding coils are wound in the corresponding winding grooves respectively; each winding coil comprises a coil wire, and the coil wire is provided with at least one layer in the radial direction of the magnetic core. The multiple partition plates are arranged, the partition plates and the winding grooves can form a step structure, the magnetic core can absorb an external magnetic field, the magnetic flux of the inductor is enhanced, and therefore the inductance value of the inductor can be increased; according to the inductor provided by the invention, by arranging the winding groove, winding and positioning of the coil wire can be more accurate, the phenomenon of displacement of the coil wire can be prevented, and the performance of the inductor can be improved, so that more accurate positioning and smoother writing can be realized, and the user experience is improved.

Description

Technical Field

[0001] The present application relates to the field of inductor technology, and in particular to an inductor and a stylus. Background Art

[0002] With the advancement of technology, digital electronic information devices have the function of trajectory input, which is usually realized by handwriting input. As a stylus pen in digital electronic information devices, it has been widely used. It can not only input text through handwriting, but also realize drawing, point control operation, etc.

[0003] Most styluses in related technologies use an inductive touch solution. Crucial components of this inductive touch solution are the electromagnetic induction circuit and the inductor. The inductor consists of a fixed magnetic core and a coil wound around it, with the electromagnetic induction circuit electrically connected to the coil. The stylus's electromagnetic induction circuit reacts with the signal measurement device on the accompanying touch panel, generating a signal corresponding to the handwritten trace. This trace is then recorded and converted into text or graphics corresponding to the handwritten trace using other devices, such as a computer.

[0004] However, in specific applications of the stylus in the related art, the coil wire is prone to displacement and the product performance is poor, which seriously affects the use effect of the stylus. Summary of the Invention

[0005] Based on this, it is necessary to provide an inductor and a stylus that can prevent the displacement of the coil wire, achieve more precise positioning and smoother writing, and enhance the user experience.

[0006] An inductor comprising:

[0007] A magnetic core, wherein a plurality of partitions are provided on the magnetic core, the plurality of partitions are spaced apart along the axial direction of the magnetic core, and a winding slot is formed between two adjacent partitions;

[0008] A plurality of winding coils, wherein the plurality of winding coils are arranged corresponding to the number of the plurality of winding slots, and the plurality of winding coils are respectively wound in the corresponding winding slots;

[0009] Each of the wound coils includes a coil conductor, and the coil conductor has at least one layer in the radial direction of the magnetic core.

[0010] In the above scheme, by setting up multiple partitions, the partitions and the winding grooves can form a stepped structure, which can enable the magnetic core to absorb the external magnetic field, enhance the magnetic flux of the inductor, and thus increase the inductance value of the inductor; by setting up the winding grooves, the winding positioning of the coil wire can be made more precise, and the phenomenon of coil wire displacement can be prevented, which can improve the performance of the inductor, and thus achieve more precise positioning and smoother writing, thereby improving the user experience.

[0011] In one embodiment, the layer of the coil wire farthest from the magnetic core is the outermost layer, and the layer of the coil wire closest to the magnetic core is the innermost layer; a connector is connected between the outermost layer of each wound coil and the innermost layer of the adjacent wound coil, and the connector is located between the two adjacent wound coils.

[0012] By setting up a connecting piece, the circuit can be circulated so that the coil wire generates a self-inductance voltage; by setting up the connecting piece between two adjacent wound coils, the connection between the two adjacent wound coils can be facilitated, and when the coil wire is multi-layered, the connecting piece and the winding of the coil wire do not affect each other, which can improve production efficiency.

[0013] In one embodiment, the two opposite sides of the connecting member protrude to form a first protrusion and a second protrusion, respectively, the first protrusion is connected to the outermost layer of the winding coil, and the second protrusion is connected to the innermost layer of the winding coil adjacent to the winding coil connected to the first protrusion.

[0014] In one embodiment, the partition is disposed around the outer wall of the magnetic core, and a clearance gap is formed on the partition, and the connecting member is located in the clearance gap.

[0015] By providing the clearance gap, the connecting piece can connect two adjacent winding coils and the overall structure can be made more compact.

[0016] In one embodiment, the winding direction of the coil wire in each of the wound coils is the same.

[0017] In one embodiment, the number of layers of the coil wire in each of the wound coils is the same.

[0018] By setting the winding direction of the coil wire in each wound coil to be the same, it can be ensured that the current on the coil wire in each wound coil flows in one direction; by setting the number of layers of the coil wire in each wound coil to be the same, the uniformity and stability of the inductance can be ensured.

[0019] In one embodiment, the distance between two adjacent partitions is 0.03 mm to 2 mm.

[0020] In one embodiment, the distance between two adjacent partitions is 0.3 mm to 0.5 mm.

[0021] In one embodiment, the diameter of the coil wire is 0.005 mm to 2 mm.

[0022] In one embodiment, the material used for the magnetic core includes ferrite or powder magnetic core.

[0023] It should be noted that ferrite is a soft magnetic material, typically sintered with iron oxide and other metal oxides (such as zinc, manganese, and nickel), with iron oxide as the primary component. Ferrite's magnetism stems from two magnetic moments in different directions: one aligned in one direction, and the other aligned in the opposite direction. The difference between the two moments produces spontaneous magnetization, hence the name "ferrimagnetism." Ferrite has a much higher resistivity than single metals or alloy magnetic materials, and also exhibits high dielectric properties. At high frequencies, it exhibits high magnetic permeability, making it a magnetic semiconductor. It performs well in high-frequency applications and is primarily used in switching power supplies and high-frequency transformers.

[0024] For example, manganese zinc ferrite has higher magnetic permeability and is suitable for low-frequency (below 1 MHz) applications, such as transformers and inductors. Nickel zinc ferrite has better high-frequency characteristics and is suitable for MHz to GHz applications, such as RF transformers and filters.

[0025] It should be noted that powder cores are made by mixing and pressing metal powder (such as iron, nickel-iron alloy, etc.) with insulating materials. Due to the insulating layer between the particles, they have good hysteresis loss characteristics and are suitable for high-frequency applications.

[0026] Exemplarily, the powdered magnetic core is an iron powder core. Iron powder cores are made from high-purity iron powder or hydroxyl iron powder through batching, pressing, and coating. The production process is relatively simple, the raw materials are inexpensive, and they come in a variety of specifications, ranging from low to high permeability materials, suitable for a variety of applications. Composite iron powder cores, which incorporate an appropriate amount of ferrite, can compensate for the lower permeability to a certain extent and are commonly used in switching power supplies and power inductors. Powdered magnetic cores are alloy powder cores. Alloy powder cores have higher magnetic permeability and are suitable for higher frequency and power applications.

[0027] In one embodiment, the coil conductor is a single-strand wire or a multi-strand wire, and the multi-strand wire and the single-strand wire are arranged with the same cross-section.

[0028] In one embodiment, the multi-strand wire is a Litz wire.

[0029] It should be noted that Litz wire is a specialized wire structure used in electromagnetic applications. It is composed of numerous finely insulated conductors braided together. This wire structure is designed to reduce the skin effect and the accumulator effect during high-frequency current transmission. These effects cause current to be deflected toward the surface of the wire during high-frequency signal transmission, increasing resistance and energy loss. The advantage of Litz wire in high-frequency applications lies in its ability to reduce the conductor's alternating current resistance (AC resistance), thereby improving transmission efficiency.

[0030] The present application also provides a stylus, comprising the inductor, a shell, and an electromagnetic induction circuit as described above, wherein the inductor is disposed inside the shell and connected to the electromagnetic induction circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] Figure 1 FIG. 1 is a schematic structural diagram of an inductor according to an embodiment of the present application at a first viewing angle.

[0034] Figure 2 FIG. 1 is a cross-sectional structural diagram of an inductor according to an embodiment of the present application.

[0035] Figure 3 FIG. 1 is a schematic structural diagram of an inductor according to an embodiment of the present application at a second viewing angle.

[0036] Figure 4 This is a schematic structural diagram of two adjacent wound coils and a connecting piece shown in an embodiment of the present application.

[0037] Figure 5 FIG. 1 is a partial structural diagram of an inductor according to an embodiment of the present application.

[0038] Figure 6 Schematic diagram of the structure of a magnetic core shown in one embodiment of the present application.

[0039] Figure 7 This is a top view of the magnetic core shown in an embodiment of the present application.

[0040] Figure 8Graph showing the inductance L of the inductor in the present application and the inductor in the comparative example.

[0041] Figure 9 1 is a resistance R curve diagram of the inductor in the present application and the inductor in the comparative example.

[0042] Figure 10 1 is a quality factor Q curve diagram of the inductor in the present application and the inductor in the comparative example.

[0043] Reference numerals:

[0044] 10. Inductor; 100. Magnetic core; 110. Partition; 120. Notch; 200. Coil conductor; 210. Connector; 211. First protrusion; 212. Second protrusion; 220. Outermost layer; 230. Innermost layer. DETAILED DESCRIPTION

[0045] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0046] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0047] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0048] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0049] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0050] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0051] With the advancement of technology, digital electronic information devices have the function of trajectory input, which is usually realized by handwriting input. As a stylus pen in digital electronic information devices, it has been widely used. It can not only input text through handwriting, but also realize drawing, point control operation, etc.

[0052] The stylus in the related art generally adopts an inductive touch solution, a capacitive touch solution, and a resistive touch solution.

[0053] Crucial components in inductive touch solutions are the electromagnetic induction circuit and inductor. The inductor consists of a fixed magnetic core and a coil wound around it, with the electromagnetic induction circuit and coil electrically connected. The stylus's electromagnetic induction circuit interacts with the signal measurement device on the accompanying touch panel, generating a signal corresponding to the handwriting trajectory. This trace is then recorded and converted into text or graphics corresponding to the handwriting trajectory by other devices such as computers.

[0054] The characteristics of inductive touch solutions are: a stylus is required as an input device; finger touch is ineffective; high accuracy makes it suitable for high-precision applications such as drawing and writing; and it is unaffected by external interference and has strong anti-interference capabilities. Application scenarios for inductive touch solutions: They are typically used in electronic drawing tablets, electronic signature devices, and other applications requiring precise input.

[0055] Capacitive touch detects touch location by measuring the capacitance between the human body and the touch panel. When a finger touches the touch panel screen, the capacitance of the touch panel changes. The system determines the location of the touch point by measuring these changes.

[0056] Capacitive touch solutions offer multi-touch functionality, support for gestures, and a smooth user experience. They require a conductive object (such as a finger) for touch control and are not compatible with gloves or regular pens. Accuracy may be affected by environmental factors (such as humidity and temperature), but they offer good scratch resistance. Capacitive touch solutions are widely used in consumer electronics such as smartphones, tablets, and laptops.

[0057] The resistive touch solution detects the touch position by contacting the upper and lower resistive layers. The pressure applied during touch causes the upper and lower conductive layers to come into contact, thereby determining the position. The characteristics of the resistive touch solution are:

[0058] Resistive touch solutions can be touched with a finger, stylus, or other object, regardless of conductive material limitations. They are insensitive to external interference and suitable for industrial environments. However, they have low sensitivity, do not support multi-touch, and are susceptible to wear. Application scenarios for resistive touch solutions include ATMs, industrial control equipment, medical devices, and other applications requiring reliable input.

[0059] From the above, we can see that inductive touch solutions are suitable for high-precision input, capacitive touch solutions are suitable for multi-touch and consumer electronics, and resistive touch solutions are suitable for single-touch applications in industrial and special environments.

[0060] However, most styluses in related technologies use inductive touch solutions. In specific applications, the existing coil wires are prone to displacement, resulting in poor product performance, which in turn seriously affects the stability of the stylus.

[0061] To solve the above problem, please refer to Figure 1 、 Figure 2 and Figure 5 The embodiment of the present application relates to an inductor 10, comprising a magnetic core 100 and a plurality of winding coils, wherein the plurality of winding coils are wound on the magnetic core 100. In this embodiment, the magnetic core 100 is a cylindrical structure.

[0062] The magnetic core 100 is provided with a plurality of partitions 110, spaced axially along the magnetic core 100, with winding slots formed between adjacent partitions 110. Specifically, the partitions 110 are disposed on the outer sidewalls of the magnetic core 100. It should be noted that this application does not impose a limit on the number of partitions 110, and the number can be set based on actual use.

[0063] In this embodiment, the plurality of wound coils almost wrap the magnetic core 100 , thereby improving the shielding effect against electromagnetic interference.

[0064] The number of winding coils corresponds to the number of winding slots, and the winding coils are respectively wound in the corresponding winding slots. Each winding coil includes a coil wire 200, and the coil wire 200 has at least one layer in the radial direction of the magnetic core 100.

[0065] In one embodiment, the coil wire 200 is wound in one layer in the radial direction of the magnetic core 100 .

[0066] In other embodiments, the coil wire 200 is wound in two, three, four or even more layers in the radial direction of the magnetic core 100 . In this embodiment, the coil wire 200 is wound in two layers in the radial direction of the magnetic core 100 .

[0067] By providing multiple partitions 110, the partitions 110 and the winding grooves can form a stepped structure, which can enable the magnetic core 100 to absorb the external magnetic field, enhance the magnetic flux of the inductor 10, and thus improve the inductance value of the inductor 10; by providing winding grooves, the winding positioning of the coil wire 200 can be made more precise, and the displacement of the coil wire 200 can be prevented, which can improve the performance of the inductor 10, thereby achieving more precise positioning and smoother writing, thereby enhancing the user experience.

[0068] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 According to some embodiments of the present application, optionally, the layer of coil wire 200 farthest from magnetic core 100 is an outermost layer 220, and the layer of coil wire 200 closest to magnetic core 100 is an innermost layer 230. A connector 210 is connected between the outermost layer 220 of each wound coil and the innermost layer 230 of an adjacent wound coil, and the connector 210 is located between the two adjacent wound coils.

[0069] Specifically, two adjacent wound coils are electrically connected via a connector 210 .

[0070] By providing the connector 210, a circuit can be established, allowing the coil conductor 200 to generate a self-inductance voltage. By providing the connector 210 between two adjacent wound coils, the connection between the two adjacent wound coils can be facilitated. Furthermore, when the coil conductor 200 is multi-layered, the connector 210 and the winding of the coil conductor 200 do not affect each other, thereby improving production efficiency.

[0071] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 According to some embodiments of the present application, optionally, the two opposite sides of the connecting member 210 protrude to form a first protrusion 211 and a second protrusion 212, respectively. The first protrusion 211 is connected to the outermost layer 220 of the wound coil, and the second protrusion 212 is connected to the innermost layer 230 of the wound coil adjacent to the wound coil connected to the first protrusion 211.

[0072] See also Figure 1 、 Figure 3 、 Figure 6 and Figure 7 According to some embodiments of the present application, optionally, the partition 110 is disposed around the outer wall of the magnetic core 100 , and a clearance gap 120 is opened on the partition 110 . The connecting member 210 is located in the clearance gap 120 .

[0073] By providing the clearance gap 120 , the connecting member 210 can connect two adjacent wound coils, and the overall structure can be made more compact.

[0074] See also Figure 1 、 Figure 2 and Figure 3 According to some embodiments of the present application, optionally, the winding direction of the coil wire 200 in each wound coil is the same.

[0075] By setting the winding direction of the coil wire 200 in each wound coil to be the same, it can be ensured that the current on the coil wire 200 in each wound coil flows in one direction.

[0076] See also Figure 1 、 Figure 2 and Figure 3 According to some embodiments of the present application, optionally, the number of layers of the coil wire 200 in each wound coil is the same.

[0077] By setting the number of layers of the coil conductor 200 in each wound coil to be the same, the uniformity and stability of the inductance can be ensured.

[0078] See also Figure 1 、 Figure 2 and Figure 3According to some embodiments of the present application, optionally, the spacing between two adjacent separators 110 is 0.03 mm to 2 mm. Specifically, the spacing between two adjacent separators 110 is 0.3 mm to 0.5 mm.

[0079] It should be noted that the present application does not limit the spacing between two adjacent partitions 110 and can be set according to actual use requirements. For example, the spacing between two adjacent partitions 110 is 0.4 mm.

[0080] See also Figure 1 、 Figure 2 and Figure 3 According to some embodiments of the present application, optionally, the diameter of the coil wire 200 is 0.005 mm to 2 mm.

[0081] It should be noted that the present application does not limit the diameter of the coil wire 200 and can be set according to actual use requirements. For example, the diameter of the coil wire 200 is 0.01 mm.

[0082] See also Figure 1 、 Figure 2 and Figure 3 According to some embodiments of the present application, optionally, the material used for the magnetic core 100 includes ferrite or powder magnetic core.

[0083] It should be noted that ferrite is a soft magnetic material, typically sintered with iron oxide and other metal oxides (such as zinc, manganese, and nickel), with iron oxide as the primary component. Ferrite's magnetism stems from two magnetic moments in different directions: one aligned in one direction, and the other aligned in the opposite direction. The difference between the two moments produces spontaneous magnetization, hence the name "ferrimagnetism." Ferrite has a much higher resistivity than single metals or alloy magnetic materials, and also exhibits high dielectric properties. At high frequencies, it exhibits high magnetic permeability, making it a magnetic semiconductor. It performs well in high-frequency applications and is primarily used in switching power supplies and high-frequency transformers.

[0084] For example, manganese zinc ferrite has a higher magnetic permeability and is suitable for low-frequency (below 1 MHz) applications, such as transformers and inductors 10. Nickel zinc ferrite has better high-frequency characteristics and is suitable for MHz to GHz applications, such as radio frequency transformers and filters.

[0085] It should be noted that powder cores are made by mixing and pressing metal powder (such as iron, nickel-iron alloy, etc.) with insulating materials. Due to the insulating layer between the particles, they have good hysteresis loss characteristics and are suitable for high-frequency applications.

[0086] Exemplarily, the powdered magnetic core is an iron powder core. Iron powder cores are made from high-purity iron powder or hydroxyl iron powder through batching, pressing, and coating. The production process is relatively simple, the raw materials are inexpensive, and they come in a variety of specifications, ranging from low to high permeability materials, suitable for a variety of applications. Composite iron powder cores, which incorporate an appropriate amount of ferrite, can compensate for the lower permeability to a certain extent and are commonly used in switching power supplies and power inductors. Powdered magnetic cores are alloy powder cores. Alloy powder cores have higher magnetic permeability and are suitable for higher frequency and power applications.

[0087] See also Figure 1 、 Figure 2 and Figure 3 According to some embodiments of the present application, coil conductor 200 may optionally be a single-stranded wire or a multi-stranded wire, with the multi-stranded wire and the single-stranded wire having the same cross-section. In this embodiment, the multi-stranded wire is a Litz wire. In other embodiments, the material used for coil conductor 200 may also be ordinary wire.

[0088] It should be noted that Litz wire is a specialized wire structure used in electromagnetic applications. It is composed of numerous finely insulated conductors braided together. This wire structure is designed to reduce the skin effect and the accumulator effect during high-frequency current transmission. These effects cause current to be deflected toward the surface of the wire during high-frequency signal transmission, increasing resistance and energy loss. The advantage of Litz wire in high-frequency applications lies in its ability to reduce the conductor's alternating current resistance (AC resistance), thereby improving transmission efficiency.

[0089] See also Figure 1 、 Figure 2 and Figure 3 The present application also provides a stylus, comprising the inductor 10, a shell, and an electromagnetic induction circuit as described above. The inductor 10 is disposed inside the shell and connected to the electromagnetic induction circuit.

[0090] The performance of the inductor 10 in the present application and the inductor in the comparative example were simulated. Specifically, the inductor in the comparative example includes a fixed magnetic core and a winding coil wound around the outer wall of the magnetic core.

[0091] See also Figure 8 、 Figure 9 and Figure 10 The operating frequency band of the stylus is 500kHz to 1MHz. The inductance L, resistance R and quality factor Q of the inductor 10 in the present application are compared with those of the inductor in the comparative example.

[0092] See also Figure 8 、 Figure 9 and Figure 10The inductance L of the inductor 10 in the present application is increased by 10% relative to that of the inductor in the comparative example, while the resistance R of the inductor 10 in the present application is lower relative to that of the inductor in the comparative example, and the quality factor Q of the inductor 10 in the present application is higher relative to that of the inductor in the comparative example.

[0093] According to the above data, the present application increases the inductance value and reduces the heat generation, thereby improving the performance of the inductor 10, thereby achieving more precise positioning and smoother writing, and improving the user experience.

[0094] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An inductor, characterized in that: include: A magnetic core, wherein a plurality of partitions are provided on the magnetic core, the plurality of partitions are spaced apart along the axial direction of the magnetic core, and a winding slot is formed between two adjacent partitions; A plurality of winding coils, wherein the plurality of winding coils are arranged corresponding to the number of the plurality of winding slots, and the plurality of winding coils are respectively wound in the corresponding winding slots; Each of the wound coils includes a coil conductor, and the coil conductor has at least one layer in the radial direction of the magnetic core.

2. The inductor according to claim 1, wherein The layer of the coil wire farthest from the magnetic core is the outermost layer, and the layer of the coil wire closest to the magnetic core is the innermost layer; a connector is connected between the outermost layer of each wound coil and the innermost layer of the adjacent wound coil, and the connector is located between two adjacent wound coils.

3. The inductor according to claim 2, wherein: The two opposite sides of the connecting member protrude to form a first protrusion and a second protrusion respectively. The first protrusion is connected to the outermost layer of the winding coil, and the second protrusion is connected to the innermost layer of the winding coil adjacent to the winding coil connected to the first protrusion.

4. The inductor according to claim 2, wherein: The partition is disposed around the outer side wall of the magnetic core, and a clearance gap is formed on the partition, and the connecting member is located in the clearance gap.

5. The inductor according to claim 1, wherein The number of layers of the coil conductor in each of the wound coils is the same.

6. The inductor according to claim 1, wherein The winding direction of the coil wire in each of the wound coils is the same.

7. The inductor according to claim 1, wherein The distance between two adjacent partitions is 0.03 mm to 2 mm.

8. The inductor according to claim 1, wherein The distance between two adjacent partitions is 0.3 mm to 0.5 mm.

9. The inductor according to claim 1, wherein: The diameter of the coil wire is 0.005 mm to 2 mm.

10. The inductor according to claim 1, wherein The material used for the magnetic core includes ferrite or powder magnetic core.

11. The inductor according to claim 1, wherein The coil conductor is a single-strand wire or a multi-strand wire, and the multi-strand wire and the single-strand wire are arranged with the same cross-section.

12. The inductor according to claim 11, wherein: The multi-strand wires are Litz wires.

13. A stylus pen, characterized in that: The invention comprises the inductor according to any one of claims 1 to 12, a housing, and an electromagnetic induction circuit, wherein the inductor is arranged inside the housing, and the inductor is connected to the electromagnetic induction circuit.

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