Magnetic core structure, winding method of magnetic core structure and fluxgate sensor

Abstract

The invention relates to a magnetic core structure, a winding method of the magnetic core structure and a fluxgate sensor. The magnetic core structure comprises at least two magnetic cores, an excitation coil assembly, an insulating part and an induction coil, the magnetic cores are annular, and the two magnetic cores are stacked in the axial direction; the excitation coil assembly comprises at least two excitation coils, and the excitation coils and the magnetic cores are wound on the magnetic cores in a one-to-one correspondence mode. The insulating part is arranged on the outer surface of the exciting coil assembly; the induction coil is wound on the insulating part. According to the magnetic core structure, the insulating part is arranged between the exciting coil assembly and the induction coil, so that an insulating effect is achieved. The excitation signal drives the excitation coil assembly, so that the magnetic core is in an excitation saturation state, and the induction coil generates an induction signal by utilizing the magnetic core in the excitation saturation state. According to the fluxgate sensor, the at least two excitation coils wound on the magnetic cores are axially stacked together with the corresponding magnetic cores, so that the magnetic induction capability of the magnetic core structure is improved, and the measurement precision of the fluxgate sensor is improved.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a magnetic core structure, a winding method of the magnetic core structure, and a fluxgate sensor. Background Art

[0002] The fluxgate sensor is a sensor that measures weak magnetic fields by utilizing the nonlinear relationship between the magnetic induction intensity and the magnetic field intensity of a high permeability core in the measured magnetic field under saturation excitation of an alternating magnetic field. It has the characteristics of high resolution, wide measurement range, high reliability, simple structure, economy and durability, and the ability to directly measure magnetic field components.

[0003] The magnetic core structure is the key component of the fluxgate sensor, which consists of the magnetic core, excitation coil, induction coil, etc. The traditional fluxgate sensor, due to the structural limitations of the magnetic core structure, has the problem of reduced measurement accuracy in a complex magnetic field environment. Summary of the invention

[0004] Based on this, it is necessary to provide a magnetic core structure, a winding method of the magnetic core structure and a fluxgate sensor, and improve the measurement accuracy of the fluxgate sensor by improving the magnetic core structure and the winding method.

[0005] In a first aspect, the present application provides a magnetic core structure, the magnetic core structure comprising:

[0006] At least two magnetic cores, each of which is arranged in a ring shape and is stacked in an axial direction;

[0007] An excitation coil assembly, comprising at least two excitation coils, wherein the excitation coils are wound on the magnetic core in a one-to-one correspondence with the magnetic core;

[0008] an insulating member, disposed on an outer surface of the excitation coil assembly; and

[0009] The induction coil is wound on the insulating member.

[0010] In some embodiments, the magnetic core structure further includes:

[0011] The reinforcing piece is arranged around the excitation coil assembly, and the induction coil is wound on the reinforcing piece.

[0012] In some embodiments, the reinforcement member includes:

[0013] An inner reinforcement plate, arranged on the inner side of the circumference of the excitation coil assembly;

[0014] An outer reinforcement plate is arranged outside the circumference of the excitation coil assembly;

[0015] A top reinforcement plate, arranged at the axial top of the excitation coil assembly;

[0016] A bottom reinforcement plate, arranged at the axial bottom of the excitation coil assembly;

[0017] The inner reinforcement plate, the outer reinforcement plate, the top reinforcement plate and the bottom reinforcement plate enclose a containing space, and the excitation coil assembly is arranged in the containing space.

[0018] In some embodiments, the inner reinforcement plate, the top reinforcement plate, the bottom reinforcement plate, and the outer reinforcement plate are connected as a whole via a plurality of connectors.

[0019] In some embodiments, the magnetic core structure further includes:

[0020] The first compensation coil is wound on the insulating member, and the first compensation coil is arranged between the insulating member and the induction coil.

[0021] In some embodiments, the magnetic core structure further includes:

[0022] The second compensation coil is wound on the outside of the induction coil, and the induction coil is arranged between the first compensation coil and the second compensation coil.

[0023] In a second aspect, the present application provides a method for winding a magnetic core structure, comprising:

[0024] Winding an excitation coil on a magnetic core, axially stacking at least two of the excitation coils wound on the magnetic core together with the corresponding magnetic core, so as to assemble the at least two excitation coils into an excitation coil assembly;

[0025] An insulating member is provided on the outer side of the excitation coil assembly;

[0026] An induction coil is wound on the insulating member.

[0027] In some embodiments, the step of providing an insulating member outside the excitation coil assembly specifically includes:

[0028] A reinforcing member is arranged around the outer side of the excitation coil assembly;

[0029] The insulating member is covered on the outer surface of the reinforcing member.

[0030] In some embodiments, the step of winding the induction coil on the insulating member specifically includes:

[0031] Winding a first compensation coil, the induction coil and a second compensation coil on the insulating member in sequence;

[0032] After the excitation coil is wound, the excitation coil is tested, and if the test result does not meet the preset requirements of the excitation coil, the excitation coil is rewound;

[0033] After the first compensation coil is wound, the first compensation coil is tested. If the test result does not meet the preset requirements of the first compensation coil, the first compensation coil is rewound. If the test result meets the test requirements of the first compensation coil, the induction coil is wound;

[0034] After the induction coil is wound, the induction coil is tested. If the test result does not meet the preset requirements of the induction coil, the induction coil is rewound. If the test result meets the test requirements of the induction coil, the second compensation coil is wound;

[0035] After the second compensation coil is wound, the second compensation coil is tested. If the test result does not meet the preset requirements of the second compensation coil, the second compensation coil is rewound.

[0036] In a third aspect, the present application provides a fluxgate sensor, comprising a magnetic core structure as in the above embodiment.

[0037] In the magnetic core structure and fluxgate sensor, the insulating member is arranged between the excitation coil assembly and the induction coil to play an insulating role. The excitation signal drives the excitation coil assembly to put the magnetic core in an excitation saturation state, and the induction coil generates an induction signal by using the magnetic core in the excitation saturation state. By axially stacking at least two excitation coils wound on the magnetic core together with the corresponding magnetic core, the magnetic sensitivity of the magnetic core structure is improved, thereby improving the measurement accuracy of the fluxgate sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] FIG. 1 is a schematic structural diagram of a magnetic core structure provided in an embodiment of the present application.

[0039] FIG. 2 is a schematic diagram of the cross-sectional structure of a magnetic core structure provided in an embodiment of the present application.

[0040] FIG. 3 is a schematic diagram of the structure of a reinforcement member provided in an embodiment of the present application.

[0041] FIG. 4 is a flow chart of a method for winding a magnetic core structure provided in an embodiment of the present application.

[0042] Reference numerals:

[0043] 100. Magnetic core structure;

[0044] 1. Magnetic core; 2. Excitation coil assembly; 21. Excitation coil; 3. Insulator; 4. Induction coil; 5. Reinforcement; 51. Inner reinforcement plate; 52. Outer reinforcement plate; 53. Top reinforcement plate; 54. Bottom reinforcement plate; 6. First compensation coil; 7. Second compensation coil. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0046] In the description of the present 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 the present 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 the present application.

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

[0048] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0049] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it 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. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in 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 a central 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 a central element at the same time. 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 implementation method.

[0051] Refer to Figure 1, which shows a schematic diagram of the structure of a magnetic core structure 100 provided in an embodiment of the present application. The present application embodiment provides a magnetic core structure 100 and a fluxgate sensor including the magnetic core structure 100. The magnetic core structure 100 is a key component of the fluxgate sensor. In some embodiments of the present application, the magnetic core structure 100 is mainly improved, and other components of the fluxgate sensor can adopt conventional structures, which will not be described in detail here.

[0052] The magnetic core structure 100 is configured as a ring shape, wherein the Z direction in Fig. 1 is the axial direction and the X direction is the radial direction. When the door sensor is detecting, the energized wire passes through the center of the ring shape to detect the magnetic field and calculate and measure the current and voltage in the wire.

[0053] Please refer to FIG. 2, which shows a schematic cross-sectional structure diagram of a magnetic core structure 100 provided in an embodiment of the present application. The magnetic core structure 100 includes at least two magnetic cores 1, an excitation coil assembly 2, an insulating member 3 and an induction coil 4. The magnetic core 1 is arranged in a ring shape, and the two magnetic cores 1 are stacked in the axial direction; the excitation coil assembly 2 includes at least two excitation coils 21, and the excitation coils 21 are wound on the magnetic core 1 in a one-to-one correspondence with the magnetic core 1; the insulating member 3 is arranged on the outer surface of the excitation coil assembly 2; and the induction coil 4 is wound on the insulating member 3. The insulating member 3 can be constructed as an insulating member 3 made of insulating copper foil.

[0054] The magnetic core structure 100 provided in the embodiment of the present application plays an insulating role by arranging the insulating member 3 between the excitation coil assembly 2 and the induction coil 4. The excitation signal drives the excitation coil assembly 2, so that the magnetic core 1 is in an excitation saturation state, and the induction coil 4 generates an induction signal by using the magnetic core 1 in the excitation saturation state. By axially stacking at least two excitation coils 21 wound on the magnetic core 1 together with the corresponding magnetic core 1, the magnetic sensitivity of the magnetic core structure 100 is improved, thereby improving the measurement accuracy of the fluxgate sensor.

[0055] 2 , two magnetic cores 1 are provided, and the excitation coils 21 are wound around the magnetic cores 1 and then stacked. In other embodiments, more than two magnetic cores 1 and corresponding excitation coils 21 may be provided as required.

[0056] In some embodiments, the excitation coil 21 may be made of enameled wire with a wire diameter of 0.2 mm. The excitation coil 21 is wound 120 turns on the surface of the magnetic core 1. The oscillation frequency of the excitation coil 21 is 6K and the inductance is 16 mT. Multiple excitation coils 21 are connected in series.

[0057] It is understandable that the wire diameter and the number of turns of the excitation coil 21 can be specifically set according to the performance requirements of the fluxgate sensor and are not limited here.

[0058] When the excitation coil 21 is wound, it is wound in an S shape between the outer and inner circles of the annular magnetic core 1 , and the excitation coil 21 is wound on the entire circumference of the magnetic core 1 , so that the excitation coil 21 has a greater length, which is more conducive to improving the magnetic sensitivity.

[0059] In some embodiments, the induction coil 4 may be made of enameled wire with a wire diameter of 0.25 mm. The number of turns of the induction coil 4 may be set to 250 turns. It is understood that the wire diameter and the number of turns of the induction coil 4 may be specifically set according to the performance requirements of the fluxgate sensor and are not limited here.

[0060] Please refer to Figures 2 and 3, Figure 3 shows a schematic diagram of the structure of a reinforcing member 5 provided in an embodiment of the present application. The magnetic core structure 100 further includes a reinforcing member 5, which is disposed around the excitation coil assembly 2, and the induction coil 4 is wound on the reinforcing member 5. By providing the reinforcing member 5, which is disposed around the outside of the excitation coil assembly 2, the reinforcing member 5 plays a role in structural reinforcement, so as to facilitate the winding of the induction coil 4.

[0061] Exemplarily, the reinforcing member 5 is constructed as a Permalloy member. Permalloy has good structural strength and processing performance, is easy to process into a shape that is convenient for winding the induction coil 4, and maintains the required structural shape for a long time. At the same time, Permalloy has good high magnetic permeability and low loss rate performance, which can prevent the reinforcing member 5 from weakening the magnetic induction performance of the magnetic core structure 100.

[0062] In some embodiments, please continue to refer to Figures 2 and 3, the reinforcement member 5 includes an inner reinforcement plate 51, an outer reinforcement plate 52, a top reinforcement plate 53 and a bottom reinforcement plate 54, the inner reinforcement plate 51 is arranged on the circumferential inner side of the excitation coil assembly 2; the outer reinforcement plate 52 is arranged on the circumferential outer side of the excitation coil assembly 2; the top reinforcement plate 53 is arranged at the axial top of the excitation coil assembly 2; the bottom reinforcement plate 54 is arranged at the axial bottom of the excitation coil assembly 2; wherein, the inner reinforcement plate 51, the outer reinforcement plate 52, the top reinforcement plate 53 and the bottom reinforcement plate 54 enclose a accommodating space, and the excitation coil assembly 2 is arranged in the accommodating space.

[0063] In one embodiment, the inner reinforcing plate 51, the outer reinforcing plate 52, the top reinforcing plate 53 and the bottom reinforcing plate 54 are provided as a split structure to facilitate the assembly of the reinforcing member 5 and the excitation coil assembly 2. After the excitation coil assembly 2 is processed, the inner reinforcing plate 51 and the outer reinforcing plate 52 are respectively sleeved on the inner and outer sides of the circumference of the annular excitation coil assembly 2, and then the top reinforcing plate 53 and the bottom reinforcing plate 54 are respectively installed on the top and bottom of the inner reinforcing plate 51 and the outer reinforcing plate 52.

[0064] Optionally, the inner reinforcing plate 51, the top reinforcing plate 53, the bottom reinforcing plate 54 and the outer reinforcing plate 52 are connected as a whole by a plurality of connectors to improve the structural strength of the reinforcing member 5. The connectors may be bolts or screws, or may be constructed by welding, bonding, or the like.

[0065] In another embodiment, only the bottom reinforcing plate 54 or the top reinforcing plate 53 is independently provided. When the bottom reinforcing plate 54 is independently provided, the inner reinforcing plate 51, the outer reinforcing plate 52 and the top reinforcing plate 53 are provided as an integrated structure, an opening is provided at the bottom, the magnetic core 1 and the excitation coil assembly 2 can be placed into the accommodation space from the opening, and the bottom reinforcing plate 54 is detachably covered at the opening. When the top reinforcing plate 53 is independently provided, the inner reinforcing plate 51, the outer reinforcing plate 52 and the bottom reinforcing plate 54 are provided as an integrated structure, an opening is provided at the top, the magnetic core 1 and the excitation coil assembly 2 can be placed into the accommodation space from the opening, and the top reinforcing plate 53 is detachably covered at the opening.

[0066] Optionally, when the bottom reinforcing plate 54 or the top reinforcing plate 53 is independently provided, the bottom reinforcing plate 54 or the top reinforcing plate 53 and the adjacent reinforcing plates are connected as one body by a plurality of connecting members. Similarly, the connecting members may be bolts or screws, or may be constructed by welding, bonding, etc.

[0067] In some embodiments, please continue to refer to FIG. 2 , the magnetic core structure 100 further includes a first compensation coil 6, which is wound on the insulating member 3 and disposed between the insulating member 3 and the induction coil 4. By arranging the first compensation coil 6 on the inner side of the induction coil 4, the induction coil 4 is compensated to improve the induction capability of the induction coil 4, thereby improving the induction signal strength generated by the induction coil 4.

[0068] Exemplarily, the first compensation coil 6 may be made of enameled wire with a wire diameter of 0.55 mm, and the number of winding turns may be set to 750 turns.

[0069] It is understandable that the wire diameter and the number of turns of the first compensation coil 6 can be specifically set according to the performance requirements of the fluxgate sensor and are not limited here.

[0070] In some embodiments, as shown in FIG2 , the magnetic core structure 100 further includes a second compensation coil 7, which is wound around the outside of the induction coil 4, and the induction coil 4 is disposed between the first compensation coil 6 and the second compensation coil 7. By arranging the second compensation coil 7 outside the induction coil 4, the induction coil 4 is further compensated, thereby further improving the induction capability of the induction coil 4.

[0071] Exemplarily, the second compensation coil 7 may be made of enameled wire with a wire diameter of 0.55 mm, and the number of winding turns may be set to 750 turns.

[0072] It is understandable that the wire diameter and the number of turns of the second compensation coil 7 can be specifically set according to the performance requirements of the fluxgate sensor and are not limited here.

[0073] The magnetic core structure 100 proposed in the embodiment of the present application includes two excitation coils 21 respectively wound on the magnetic core 1, and the two excitation coils 21 constitute an excitation coil assembly 2. A reinforcing member 5 is provided on the outside of the excitation coil assembly 2, and an insulating member 3, a first compensation coil 6, an induction coil 4, and a second compensation coil 7 are wound on the outside of the reinforcing member 5 in sequence. By providing two excitation coils 21, and providing the first compensation coil 6 and the second compensation coil 7, the magnetic sensitivity of the magnetic core structure 100 is improved, thereby improving the measurement accuracy of the fluxgate sensor. By providing the reinforcing member 5, it acts as a skeleton inside the magnetic core structure 100, facilitating the positioning of other structures; at the same time, the reinforcing member 5 is made of Permalloy, and in cooperation with the insulating member 3, it can effectively shield the influence of the external magnetic field on the measurement accuracy.

[0074] In some embodiments, the fluxgate sensor further includes a transfer wire and a PCB board, and the transfer wire connects the magnetic core structure 100 and the PCB board. Specifically, two ends of the transfer wire are respectively connected to the magnetic core structure 100 and the PCB board by welding.

[0075] Please refer to Figure 4, which shows a flow chart of a winding method of a magnetic core structure provided in an embodiment of the present application. The present application also provides a winding method of a magnetic core structure, comprising the following steps:

[0076] S1: Winding an excitation coil 21 on the magnetic core 1, axially stacking at least two excitation coils 21 wound on the magnetic core 1 together with the corresponding magnetic core 1, so as to assemble the at least two excitation coils 21 into an excitation coil assembly 2;

[0077] S2: an insulating member 3 is arranged outside the excitation coil assembly 2;

[0078] S3: Winding the induction coil 4 on the insulating member 3 .

[0079] In some embodiments, step S2 specifically includes:

[0080] A reinforcing member 5 is arranged around the outer side of the excitation coil assembly 2;

[0081] The insulating member 3 is covered on the outer surface of the reinforcing member 5 .

[0082] In some embodiments, step S3 specifically includes:

[0083] The first compensation coil 6 , the induction coil 4 and the second compensation coil 7 are wound on the insulating member 3 in sequence.

[0084] In some embodiments, in step S1, after the excitation coil 21 is wound, the excitation coil 21 is tested. If the test result does not meet the preset requirements of the excitation coil 21, the excitation coil 21 is rewound; this step is repeated until the number of turns, inductance and other parameters of the excitation coil 21 meet the preset requirements. After the test result of the excitation coil 21 meets the preset requirements, at least two excitation coils 21 wound on the magnetic core 1 are axially stacked to assemble into an excitation coil assembly 2.

[0085] In some embodiments, in step S3, after the first compensation coil 6 is wound, the first compensation coil 6 is tested. If the test result does not meet the preset requirements of the first compensation coil 6, the winding is re-performed. If it meets the test requirements of the first compensation coil 6, the induction coil 4 is wound.

[0086] In some embodiments, in step S3, after the induction coil 4 is wound, the induction coil 4 is tested. If the test result does not meet the preset requirements of the induction coil 4, the induction coil 4 is rewound. If the test result meets the test requirements of the induction coil 4, the second compensation coil 7 is wound.

[0087] In some embodiments, in step S3, after the second compensation coil 7 is wound, the second compensation coil 7 is tested, and if the test result does not meet the preset requirements of the second compensation coil 7, the second compensation coil 7 is rewound.

[0088] In some embodiments, the winding method of the magnetic core structure further includes the following steps:

[0089] S4: After step S3, welding the adapter wire on the magnetic core structure 100, and testing the magnetic core structure 100 welded with the adapter wire. If the test result does not meet the preset requirements, re-weld the adapter wire;

[0090] S5: Assemble the magnetic core structure 100 meeting the preset requirements in S4 with the PCB board.

[0091] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0092] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A magnetic core structure, characterized in that: The magnetic core structure comprises: At least two magnetic cores (1), the magnetic cores (1) being arranged in a ring shape, and the two magnetic cores (1) being arranged in a stacked manner along the axial direction; An excitation coil assembly (2) comprising at least two excitation coils (21), wherein the excitation coils (21) are wound on the magnetic core (1) in a one-to-one correspondence with the magnetic core (1); an insulating member (3) disposed on the outer surface of the excitation coil assembly (2); and The induction coil (4) is wound on the insulating member (3).

2. The magnetic core structure according to claim 1, characterized in that: The magnetic core structure also includes: A reinforcing member (5) is disposed around the excitation coil assembly (2), and the induction coil (4) is wound on the reinforcing member (5).

3. The magnetic core structure according to claim 2, characterized in that: The reinforcing member (5) comprises: An inner reinforcing plate (51) is arranged on the inner side of the circumference of the excitation coil assembly (2); An outer reinforcing plate (52) is arranged outside the circumference of the excitation coil assembly (2); A top reinforcement plate (53) disposed at the axial top of the excitation coil assembly (2); A bottom reinforcement plate (54) arranged at the axial bottom of the excitation coil assembly (2); The inner reinforcing plate (51), the outer reinforcing plate (52), the top reinforcing plate (53) and the bottom reinforcing plate (54) enclose a containing space, and the excitation coil assembly (2) is arranged in the containing space.

4. The magnetic core structure according to claim 3, characterized in that: The inner reinforcing plate (51), the top reinforcing plate (53), the bottom reinforcing plate (54), and the outer reinforcing plate (52) are connected as a whole via a plurality of connecting pieces.

5. The magnetic core structure according to any one of claims 1 to 4, characterized in that: The magnetic core structure also includes: A first compensation coil (6) is wound on the insulating member (3); the first compensation coil (6) is arranged between the insulating member (3) and the induction coil (4).

6. The magnetic core structure according to claim 5, characterized in that: The magnetic core structure also includes: The second compensation coil (7) is wound on the outside of the induction coil (4), and the induction coil (4) is arranged between the first compensation coil (6) and the second compensation coil (7).

7. A method for winding a magnetic core structure, characterized in that: include: Winding an excitation coil (21) on a magnetic core (1), and axially stacking at least two of the excitation coils (21) wound on the magnetic core (1) together with the corresponding magnetic core (1), so as to assemble the at least two excitation coils (21) into an excitation coil assembly (2); An insulating member (3) is arranged on the outside of the excitation coil assembly (2); An induction coil (4) is wound on the insulating member (3).

8. The method for winding a magnetic core structure according to claim 7, characterized in that: The step of arranging an insulating member (3) on the outside of the excitation coil assembly (2) specifically comprises: A reinforcing member (5) is arranged around the outer side of the excitation coil assembly (2); The insulating member (3) is covered on the outer surface of the reinforcing member (5).

9. The method for winding a magnetic core structure according to claim 8, characterized in that: The step of winding the induction coil (4) on the insulating member (3) specifically comprises: A first compensation coil (6), the induction coil (4) and a second compensation coil (7) are sequentially wound on the insulating member (3); After the excitation coil (21) is wound, the excitation coil (21) is tested, and if the test result does not meet the preset requirements of the excitation coil (21), the excitation coil (21) is rewound; After the first compensation coil (6) is wound, the first compensation coil (6) is tested, and if the test result does not meet the preset requirements of the first compensation coil (6), the first compensation coil (6) is rewound, and if the test result meets the test requirements of the first compensation coil (6), the induction coil (4) is wound; After the induction coil (4) is wound, the induction coil (4) is tested; if the test result does not meet the preset requirements of the induction coil (4), the induction coil (4) is rewound; if the test result meets the test requirements of the induction coil (4), the second compensation coil (7) is wound; After the second compensation coil (7) is wound, the second compensation coil (7) is tested, and if the test result does not meet the preset requirements of the second compensation coil (7), the second compensation coil (7) is rewound.

10. A fluxgate sensor, characterized in that: Comprising the magnetic core structure as described in any one of claims 1-6.

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