A sheet-like ferromagnetic strip detection apparatus

Abstract

This application provides a testing device for sheet-like ferromagnetic magnetic materials, relating to the field of magnetic measurement equipment technology. The testing device includes a coupling magnetic yoke, a first excitation winding, a second excitation winding, a sample, and a testing component. The coupling magnetic yoke includes a connecting portion, a first excitation terminal, and a second excitation terminal. The first excitation terminal is symmetrically arranged in the connecting portion along a first direction, and the second excitation terminal is symmetrically arranged in the connecting portion along a second direction. The first excitation winding is wound around the first excitation terminal. The second excitation winding is wound around the second excitation terminal. The sample is connected to both the first and second excitation terminals to form a spatially coupled magnetic circuit. The testing component is connected to both the first and second excitation windings to simultaneously detect the magnetic parameters of the sample in the first and second directions. This device achieves the effect of synchronously detecting the magnetic parameters of sheet-like ferromagnetic magnetic materials in different directions.

Description

Technical Field

[0001] This application relates to the field of magnetic measurement equipment technology, and in particular to a testing device for sheet-like ferromagnetic magnetic materials. Background Technology

[0002] Ferromagnetic sheet strips are core magnetic materials for power equipment and electronic components such as power transformers, motors, and inductors. Their magnetic properties directly affect the energy efficiency, power density, and operational stability of the equipment. Due to the strong texture formed during the rolling process, these materials exhibit significant anisotropy in their magnetic properties along the rolling direction (RD) and the transverse direction (TD).

[0003] In related technologies, Epstein square coils or monolithic magnetometers are typically used to measure the total magnetic flux along a specific path by winding excitation and induction coils, and then calculate the average magnetic parameters.

[0004] However, the above-mentioned tests can only detect the overall magnetic properties of a material in a single direction, and cannot achieve simultaneous detection of magnetic parameters of the material in different directions. Summary of the Invention

[0005] This application provides a testing device for sheet-like ferromagnetic magnetic materials, which can achieve the effect of synchronous detection of magnetic parameters in different directions of sheet-like ferromagnetic magnetic materials.

[0006] This application provides a testing device for sheet-like ferromagnetic magnetic materials, including:

[0007] A coupling magnetic yoke, the coupling magnetic yoke including a connecting portion, at least two first excitation terminals and at least two second excitation terminals, the first excitation terminals being symmetrically arranged in the connecting portion along a first direction, and the second excitation terminals being symmetrically arranged in the connecting portion along a second direction;

[0008] The first excitation winding is wound on the first excitation terminal;

[0009] The second excitation winding is wound around the second excitation terminal, and the coupled magnetic circuit formed by the second excitation winding is symmetrical to the coupled magnetic circuit formed by the first excitation winding.

[0010] The sample is connected to the first excitation terminal and the second excitation terminal respectively to form a spatially coupled magnetic circuit;

[0011] A detection component is connected to the first excitation winding and the second excitation winding respectively to synchronously detect the magnetic parameters of the sample in the first and second directions.

[0012] In one possible implementation, the first direction and the second direction are arranged orthogonally, so that the coupled magnetic circuit formed by the second excitation winding is orthogonally arranged with the coupled magnetic circuit formed by the first excitation winding.

[0013] In one possible implementation, the coupling yoke further includes a plurality of support terminals disposed on the connection portion, the support terminals being disposed between the first excitation terminal and the second excitation terminal, and the sample being disposed on the support terminals.

[0014] In one possible implementation, the support terminal, the first excitation terminal, and the second excitation terminal are arranged to form a regular octagon.

[0015] In one possible implementation, the first excitation winding is wound in opposite directions at two oppositely arranged first excitation terminals, and the second excitation winding is wound in opposite directions at two oppositely arranged second excitation terminals.

[0016] In one possible implementation, both the first excitation winding and the second excitation winding have N turns.

[0017]

[0018] in, Minimum excitation current; The cross-sectional area of ​​the connection part is the flow passage area. The cross-sectional area of ​​the sample is the flow passage. R is the permeability of the coupled yoke; R is the magnetic reluctance in the magnetic circuit. This represents the maximum magnetic field strength in the linear region of the coupled magnetic yoke; It is the minimum detectable magnetic flux density.

[0019] In one possible implementation, the sheet-like ferromagnetic magnetic material testing device further includes two sets of excitation power supplies, which are electrically connected to the first excitation winding and the second excitation winding, respectively. Each excitation power supply includes a waveform generator and a linear power amplifier. The waveform generator is electrically connected to the linear power amplifier, and the linear power amplifier is electrically connected to either the first excitation winding or the second excitation winding.

[0020] In one possible implementation, the sheet ferromagnetic magnetic material testing device further includes two sets of current-regulating resistors, which are connected in series with the first excitation winding and the second excitation winding, respectively, and connected in series with the excitation power supply to form an excitation circuit.

[0021] In one possible implementation, the detection component includes a data acquisition unit and two detection probes, the detection probes being electrically connected to the data acquisition unit and to the first excitation winding and the second excitation winding, respectively.

[0022] In one possible implementation, the end of the sample extends beyond the first excitation terminal or the second excitation terminal.

[0023] This application provides a testing device for sheet-like ferromagnetic magnetic materials. By symmetrically arranging a first excitation terminal and a second excitation terminal on a coupled magnetic yoke, and winding the first excitation winding and the second excitation winding around them respectively, the sample is connected to the first excitation terminal and the second excitation terminal to form a mutually coupled spatial magnetic circuit. This constructs two symmetrical and coupled excitation magnetic circuits, allowing for the simultaneous application of excitation magnetic fields in the first and second directions, achieving two-dimensional synchronous excitation. The detection components simultaneously acquire the magnetic parameters of the sample in the first and second directions, thereby enabling the synchronous detection of the anisotropic magnetic properties of the ferromagnetic magnetic material in a plane. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] Figure 1 A schematic diagram of the magnetic circuit structure in the sheet ferromagnetic magnetic material testing equipment provided in this application;

[0026] Figure 2 for Figure 1 Explosion-proof diagram of the central magnetic circuit;

[0027] Figure 3 for Figure 1 Schematic diagram of the orientation and position of the middle magnetic loop;

[0028] Figure 4 for Figure 1 Topological structure diagram of the intermediate magnetic circuit;

[0029] Figure 5 for Figure 4 A simplified schematic diagram of the topology of the intermediate magnetic loop;

[0030] Figure 6 A schematic diagram of the connection structure of the sheet ferromagnetic magnetic material testing equipment provided in this application;

[0031] Figure 7 for Figure 6 A schematic diagram of the connection structure of the intermediate excitation power supply.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100, Coupling yoke; 110, Connecting part; 120, First excitation terminal; 130, Second excitation terminal; 140, Support terminal;

[0034] 200. First excitation winding;

[0035] 300. Second excitation winding;

[0036] 400, Sample Images;

[0037] 500. Detection component; 510. Data acquisition unit; 520. Detection probe;

[0038] 600. Excitation power supply; 610. Waveform generator; 620. Linear power amplifier;

[0039] 700, current regulating resistor.

[0040] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0041] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0042] Ferromagnetic sheet strips develop a strong texture during the rolling process, resulting in significant anisotropic differences in their magnetic properties in the rolling direction (RD) and the transverse direction (TD).

[0043] Existing measurement methods primarily rely on Epstein square coils or monolithic permeameters. These methods involve winding excitation and induction coils around a sample to measure the total magnetic flux in a specific magnetic circuit, thereby calculating the material's average magnetic parameters. However, these methods are essentially one-dimensional point or volume-average measurements, only able to obtain the overall magnetic properties of the material in a single direction (usually the rolling direction RD) or the entire magnetic circuit. They cannot independently and synchronously measure and compare the magnetic properties in different directions within a plane (such as RD and transverse TD), thus making it difficult to accurately characterize and quantify the material's two-dimensional magnetic anisotropy. Furthermore, the methods require cutting, stacking, or winding coils on the sample, constituting contact-based destructive testing. This is not only cumbersome but may also introduce mechanical stress that disturbs the material's intrinsic magnetic properties, affecting the accuracy and reliability of the measurement results.

[0044] This application provides a testing device for sheet-like ferromagnetic magnetic materials. By symmetrically arranging a first excitation terminal and a second excitation terminal on a coupled magnetic yoke, and winding the first excitation winding and the second excitation winding around them respectively, the sample is connected to the first excitation terminal and the second excitation terminal to form a mutually coupled spatial magnetic circuit. This constructs two symmetrical and coupled excitation magnetic circuits, allowing for the simultaneous application of excitation magnetic fields in the first and second directions, achieving two-dimensional synchronous excitation. The detection components simultaneously acquire the magnetic parameters of the sample in the first and second directions, thereby enabling the synchronous detection of the anisotropic magnetic properties of the ferromagnetic magnetic material in a plane.

[0045] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0046] This application provides a testing device for sheet-like ferromagnetic magnetic materials, referring to... Figure 1 , Figure 2 and Figure 3 The sheet ferromagnetic material testing equipment includes a coupling magnetic yoke 100, a first excitation winding 200, a second excitation winding 300, a sample sheet 400, and a testing component 500.

[0047] The coupling yoke 100 includes a connecting portion 110, at least two first excitation terminals 120 and at least two second excitation terminals 130. The first excitation terminals 120 are symmetrically arranged in the connecting portion 110 along a first direction, and the second excitation terminals 130 are symmetrically arranged in the connecting portion 110 along a second direction.

[0048] The first excitation winding 200 is wound on the first excitation terminal 120. The second excitation winding 300 is wound on the second excitation terminal 130, and the coupled magnetic circuit formed by the second excitation winding 300 is symmetrical to the coupled magnetic circuit formed by the first excitation winding 200.

[0049] Sample 400 is connected to the first excitation terminal 120 and the second excitation terminal 130 respectively to form a spatially coupled magnetic circuit.

[0050] The detection component 500 is connected to the first excitation winding 200 and the second excitation winding 300 respectively to synchronously detect the magnetic parameters of the sample 400 in the first and second directions.

[0051] By symmetrically arranging the first excitation terminal 120 and the second excitation terminal 130 on the coupling yoke 100, and winding the first excitation winding 200 and the second excitation winding 300 respectively, the sample 400 is connected to the first excitation terminal 120 and the second excitation terminal 130 to form a mutually coupled spatial magnetic circuit. This constructs two symmetrical and coupled excitation magnetic circuits, allowing for the synchronous application of excitation magnetic fields in the first and second directions, achieving two-dimensional synchronous excitation. The detection component 500 synchronously acquires the magnetic parameters of the sample 400 in the first and second directions, thereby enabling synchronous detection of the anisotropic magnetic properties of the ferromagnetic magnetic material in the plane.

[0052] For example, there are two first excitation terminals 120, which are symmetrically arranged on the connecting part 110. Similarly, there are two second excitation terminals 130, which are symmetrically arranged on the connecting part 110. The connection between the two first excitation terminals 120 and the connection between the two second excitation terminals 130 are arranged to cross each other.

[0053] For example, the connecting part 110 is a ring-shaped structure with its ends connected. The connecting part 110 can be a circular ring, an arc-shaped ring, a polygonal ring, etc.

[0054] In one possible implementation, refer to Figure 1 , Figure 2 and Figure 3 The first direction and the second direction are arranged orthogonally, so that the coupled magnetic circuit formed by the second excitation winding 300 is orthogonally set to the coupled magnetic circuit formed by the first excitation winding 200.

[0055] In the embodiments of this application, reference is made to Figure 1 and Figure 3 The first direction is the x-direction, and the second direction is the y-direction. The first and second directions are perpendicular to each other on the same plane. With one end of the first direction as 0°, the first excitation terminal 120 is located at 0° and 180°, and the second excitation terminal 130 is located at 90° and 270°.

[0056] In one possible implementation, the coupling yoke 100 further includes a plurality of support terminals 140, which are disposed on the connecting portion 110 and between the first excitation terminal 120 and the second excitation terminal 130, and the sample 400 is disposed on the support terminals 140.

[0057] Multiple support terminals 140 added to the coupling yoke 100 are located in the connecting portion 110 and arranged between the first excitation terminal 120 and the second excitation terminal 130 to stably support the sample 400. This not only ensures that the sample 400 maintains a precise spatial position and good contact during two-dimensional excitation, reducing magnetic circuit asymmetry caused by offset or deformation, but also effectively isolates the influence of mechanical stress on the magnetic properties of the sample 400, thereby improving the uniformity of the excitation magnetic field and the stability of the detection signal, providing reliable mechanical and magnetic circuit support for achieving synchronous two-dimensional magnetic parameter measurement.

[0058] In one possible implementation, the support terminal 140, the first excitation terminal 120, and the second excitation terminal 130 are arranged to form a regular octagon.

[0059] It provides balanced and symmetrical support and magnetic flux path for the sample 400. The regular octagonal structure helps ensure that the sample 400 receives uniform physical support in all directions, reducing deformation or stress concentration caused by uneven pressure distribution, thereby maintaining the magnetic properties of the sample 400 in its natural state. Furthermore, during excitation, the symmetrical distribution of the terminals along the regular octagon facilitates the formation of a more uniform and symmetrical magnetic field environment, resulting in more consistent excitation effects in the first and second directions, further improving the accuracy and reliability of two-dimensional synchronous detection. It also helps optimize space utilization, making the overall equipment design more compact and efficient, while facilitating the installation and removal of the sample 400.

[0060] In the example of this application, the connecting portion 110 is also configured as a regular octagon. The first excitation terminal 120, the second excitation terminal 130, and the support terminal 140 are respectively disposed on one side of the connecting portion 110.

[0061] For example, the support terminal 140 is located on the connecting portion 110 at positions of 45°, 135°, 225°, and 315°.

[0062] For example, the first excitation terminal 120, the second excitation terminal 130, the support terminal 140 and the connecting part 110 are all made of the same material, such as pure iron or silicon steel sheet.

[0063] For example, the sample 400 is in the shape of a star. Each side of the sample 400 is placed on top of the first excitation terminal 120, the second excitation terminal 130, and the support terminal 140 respectively.

[0064] The sample 400 is placed directly on top of the first excitation terminal 120, the second excitation terminal 130, and the support terminal 140, forming an open edge structure. This means the sample 400 is not completely enclosed but partially exposed. This allows for the direct application of controllable mechanical stress to its edge area without disassembling the sample 400 or interfering with the magnetic circuit. The open edge structure also avoids the non-uniform clamping force or localized plastic deformation that may be introduced by traditional closed clamping methods, helping to maintain the authenticity of the intrinsic magnetic state of the sample 400.

[0065] By adopting the above technical solution, the first excitation winding 200 and the second excitation winding 300 generate a uniform circular rotating magnetic field in the circular region at the center of the sample 400. This achieves local excitation measurement, applying an efficient and concentrated excitation magnetic field only to the central region of the sample 400, improving the magnetic field uniformity of the excitation region, and reducing the required excitation power.

[0066] In one possible implementation, the first excitation winding 200 is wound in opposite directions at two oppositely arranged first excitation terminals 120, and the second excitation winding 300 is wound in opposite directions at two oppositely arranged second excitation terminals 130.

[0067] When the first direction is perpendicular to the second direction, the first excitation winding 200 and the second excitation winding 300 form a spatially orthogonal alternating magnetic field.

[0068] The first excitation winding 200 is wound in opposite directions on two oppositely arranged first excitation terminals 120, and the second excitation winding 300 is also wound in opposite directions on two oppositely arranged second excitation terminals 130. This symmetrical anti-winding structure allows the mutual inductance flux generated by the two excitation currents to cancel each other out in the coupling yoke 100, thereby reducing the mutual inductance reactance between the windings. This effectively reduces the phase shift in the excitation circuit and improves the synchronization and linearity between the excitation current and the magnetic induction intensity.

[0069] For example, the excitation coils of the first excitation winding 200 and the second excitation winding 300 are uniformly wound on the first excitation terminal 120 and the second excitation terminal 130, respectively. Furthermore, the coils of the first excitation winding 200 and the second excitation winding 300 are both formed by winding a single complete wire.

[0070] In one possible implementation, the number of turns in both the first excitation winding 200 and the second excitation winding 300 is N.

[0071]

[0072] This formula represents the estimated upper and lower limits of the number of coil turns under minimum excitation current conditions. Minimum excitation current; The cross-sectional area of ​​the connection part is the flow passage area. The cross-sectional area of ​​the sample is the flow passage. R is the permeability of the coupled yoke; R is the magnetic reluctance in the magnetic circuit. This represents the maximum magnetic field strength in the linear region of the coupled magnetic yoke; It is the minimum detectable magnetic flux density.

[0073] Specifically, the formula is derived as follows:

[0074]

[0075] Where F is the magnetomotive force. For current, R is the magnetic flux, and R is the magnetic reluctance.

[0076]

[0077] Where B is the magnetic flux density and S is the cross-sectional area of ​​the flow path.

[0078]

[0079] in, The length of the magnetic circuit. is the magnetic permeability.

[0080] By combining the above formulas, we can obtain the following:

[0081]

[0082] Therefore, the number of turns is determined by the magnetic induction intensity, magnetic reluctance, and excitation current.

[0083] In the example where the first and second directions are orthogonal, the magnetic flux amplitudes in the first and second directions are equal, but their phases differ by 90 degrees. Therefore, the maximum magnetic flux in the coupled yoke 100 is... The magnetic flux of a single magnetic circuit is doubled. Since both magnetic circuits have two coils, the number of turns in each coil is half the total number of turns. Therefore, the number of turns wound on the first excitation terminal 120 or the second excitation terminal 130 has a coefficient. .

[0084] In the example of this application, the coupled magnetic flux loop of the overall structure constitutes Figure 4 The topology shown can be simplified to the following based on symmetry: Figure 5 In the topology shown, the four excitation sources correspond to the four excitation coils of the first excitation winding 200 and the second excitation winding 300, distributed on two spatially orthogonal branches. The connecting part 110 forms a bridge capable of coupling the two orthogonal magnetic circuits. The magnetic reluctance is for the first excitation terminal 120, the second excitation terminal 130, or the support terminal 140. The magnetic resistance of the connecting portion 110 at the connection point of the first excitation terminal 120, the second excitation terminal 130, or the support terminal 140.

[0085] The topology formed in this embodiment is compact and magnetically coupled, which can reduce power loss on the yoke, increase the excitation power ratio on sample 400, and generate a highly uniform local excitation region.

[0086] In one possible implementation, refer to Figure 6 The sheet-like ferromagnetic magnetic material testing equipment also includes two sets of excitation power supplies 600. The two sets of excitation power supplies 600 are electrically connected to the first excitation winding 200 and the second excitation winding 300, respectively. The excitation power supply 600 includes a waveform generator 610 and a linear power amplifier 620. The waveform generator 610 is electrically connected to the linear power amplifier 620, and the linear power amplifier 620 is electrically connected to the first excitation winding 200 or the second excitation winding 300.

[0087] Two independent excitation power supplies 600 are electrically connected to the first excitation winding 200 and the second excitation winding 300, respectively. A waveform generator 610 can precisely set the frequency, amplitude, and waveform of the excitation signal, which is then driven by a high-fidelity, low-distortion linear power amplifier 620. This achieves independent and precise control of the excitation signals in two orthogonal directions, ensuring the timing consistency and waveform accuracy of two-dimensional synchronous excitation. It also effectively suppresses harmonic distortion and phase drift, improving the repeatability and dynamic response of magnetic parameter measurements, and providing a high-quality excitation basis for comprehensively characterizing the in-plane anisotropic magnetic properties of materials.

[0088] For example, waveform generator 610 is a dual-channel output waveform generator 610. Linear power amplifier 620 is a dual-channel linear power amplifier 620.

[0089] For example, the angle between the first direction and the second direction is θ. And the excitation voltage amplitude is equal, and it is connected in series with the excitation coils on the two spatially orthogonal branches, which can generate a uniform circular rotating magnetic field in the circular region at the center of the sample 400.

[0090] In this example, the magnetic flux density in both directions is:

[0091]

[0092]

[0093] In the example of this application, the dual channels of the waveform generator 610 generate sinusoidal AC voltages with a 90-degree phase difference. The waveform coefficient of the excitation voltage is within the range of ±1% of 1.11, and the amplitude of the excitation voltage is equal. When connected in series with the excitation coils on two spatially orthogonal branches, a uniform circular rotating magnetic field can be generated in the circular region at the center of the sample 400.

[0094] In this example, refer to Figure 5 and Figure 6 The magnetic induction intensity in both directions is:

[0095]

[0096]

[0097] In one possible implementation, the sheet ferromagnetic magnetic material testing device further includes two sets of current regulating resistors 700, which are connected in series with the first excitation winding 200 and the second excitation winding 300, respectively, and are connected in series with the excitation power supply 600 to form an excitation circuit.

[0098] Two sets of current-regulating resistors 700 are connected in series to the first excitation winding 200 and the second excitation winding 300, respectively, and together with the corresponding excitation power supply 600, they form an independent excitation circuit. By adjusting the resistance value of the current-regulating resistors 700, the amplitude of the excitation current flowing through each winding can be controlled. This ensures stable output of the waveform generator 610 and the linear power amplifier 620, while achieving precise matching and independent adjustment of the magnetic field strength in two orthogonal directions.

[0099] In one possible implementation, refer to Figure 6 and Figure 7 The detection component 500 includes a data acquisition unit 510 and two detection probes 520. The detection probes 520 are electrically connected to the data acquisition unit 510 and to the first excitation winding 200 and the second excitation winding 300, respectively.

[0100] Two detection probes 520 can sense the local magnetic response signals generated by the sample 400 under the excitation in the first and second directions in real time and synchronously, and perform synchronous sampling and digital processing through the data acquisition unit 510. Since the probes are directly associated with the magnetic circuit excited by the excitation winding, they can effectively capture the dynamic magnetic flux changes in each direction, avoid signal crosstalk, and thus achieve independent, synchronous, and high-fidelity detection of the two-dimensional magnetic parameters in the ferromagnetic magnetic material, improving the accuracy and efficiency of anisotropy characterization.

[0101] In one possible implementation, the end of the sample 400 extends beyond the first excitation terminal 120 or the second excitation terminal 130.

[0102] The end of the sample 400 extends beyond the first excitation terminal 120 or the second excitation terminal 130, forming an exposed free edge region. This facilitates the application of localized mechanical stress to the sample 400 without interfering with the main magnetic circuit. Furthermore, the extended portion can serve as an access point for electrical or optical measurements, facilitating the integration of additional sensors (such as strain gauges, Hall probes, or fiber optic gratings) for simultaneous multi-physics monitoring. It also avoids the terminals covering the entire area of ​​the sample 400, reducing interference from edge magnetic flux distortion and end leakage magnetic field on the effective measurement area. This helps improve the uniformity and controllability of the magnetic field distribution within the localized excitation region, further enhancing the accuracy and repeatability of two-dimensional magnetic property detection.

[0103] For example, one end of the sample 400 disposed on the support terminal 140 also extends beyond the support terminal 140. The distance from the end of the sample 400 to the support terminal 140, the first excitation terminal 120, or the second excitation terminal 130 is L.

[0104] In the example of this application, L ≥ 1 cm.

[0105] This application provides a sheet-like ferromagnetic magnetic material testing device. By symmetrically arranging a first excitation terminal 120 and a second excitation terminal 130 on a coupling magnetic yoke 100, and respectively winding a first excitation winding 200 and a second excitation winding 300, the sample 400 is connected to the first excitation terminal 120 and the second excitation terminal 130 to form a mutually coupled spatial magnetic circuit. This constructs two symmetrical and coupled excitation magnetic circuits, allowing for the synchronous application of excitation magnetic fields in the first and second directions, achieving two-dimensional synchronous excitation. The detection component 500 synchronously acquires the magnetic parameters of the sample 400 in the first and second directions, thereby enabling synchronous detection of the anisotropic magnetic properties of the ferromagnetic magnetic material in a plane.

[0106] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and alterations may be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A testing device for sheet-like ferromagnetic magnetic materials, characterized in that, include: A coupling yoke (100) includes a connecting portion (110), at least two first excitation terminals (120) and at least two second excitation terminals (130), wherein the first excitation terminals (120) are symmetrically arranged on the connecting portion (110) along a first direction, and the second excitation terminals (130) are symmetrically arranged on the connecting portion (110) along a second direction; The first excitation winding (200) is wound on the first excitation terminal (120); The second excitation winding (300) is wound around the second excitation terminal (130), and the coupled magnetic circuit formed by the second excitation winding (300) is symmetrical to the coupled magnetic circuit formed by the first excitation winding (200). Sample (400), wherein the sample (400) is connected to the first excitation terminal (120) and the second excitation terminal (130) respectively to form a spatially coupled magnetic circuit; A detection component (500) is connected to the first excitation winding (200) and the second excitation winding (300) respectively to synchronously detect the magnetic parameters of the sample (400) in the first and second directions.

2. The sheet-like ferromagnetic magnetic material testing equipment according to claim 1, characterized in that, The first direction and the second direction are arranged orthogonally, so that the coupled magnetic circuit formed by the second excitation winding (300) is orthogonally arranged with the coupled magnetic circuit formed by the first excitation winding (200).

3. The sheet-like ferromagnetic magnetic material testing equipment according to claim 1, characterized in that, The coupling yoke (100) also includes a plurality of support terminals (140), the support terminals (140) are disposed on the connecting part (110), the support terminals (140) are disposed between the first excitation terminal (120) and the second excitation terminal (130), and the sample (400) is disposed on the support terminals (140).

4. The sheet-like ferromagnetic magnetic material testing equipment according to claim 3, characterized in that, The support terminal (140), the first excitation terminal (120) and the second excitation terminal (130) are arranged to form a regular octagon.

5. The testing equipment for sheet-like ferromagnetic magnetic materials according to any one of claims 1-4, characterized in that, The first excitation winding (200) is wound in opposite directions at two oppositely arranged first excitation terminals (120), and the second excitation winding (300) is wound in opposite directions at two oppositely arranged second excitation terminals (130).

6. The sheet-like ferromagnetic magnetic material testing device according to any one of claims 1-4, characterized in that, The number of turns in both the first excitation winding (200) and the second excitation winding (300) is N. in, Minimum excitation current; The cross-sectional area of ​​the connecting part (110) is the flow passage area; The cross-sectional area of ​​the sample (400) is the flow passage area. R is the permeability of the coupled magnetic yoke (100); R is the magnetic reluctance in the magnetic circuit; The maximum magnetic field strength in the linear region of the coupled magnetic yoke (100); It is the minimum detectable magnetic flux density.

7. The sheet-like ferromagnetic magnetic material testing device according to any one of claims 1-4, characterized in that, It also includes two sets of excitation power supplies (600), which are electrically connected to the first excitation winding (200) and the second excitation winding (300) respectively. Each excitation power supply (600) includes a waveform generator (610) and a linear power amplifier (620). The waveform generator (610) is electrically connected to the linear power amplifier (620), and the linear power amplifier (620) is electrically connected to either the first excitation winding (200) or the second excitation winding (300).

8. The sheet-like ferromagnetic magnetic material testing equipment according to claim 7, characterized in that, It also includes two sets of current regulating resistors (700), which are connected in series with the first excitation winding (200) and the second excitation winding (300), respectively, and are connected in series with the excitation power supply (600) to form an excitation circuit.

9. The testing equipment for sheet-like ferromagnetic magnetic materials according to any one of claims 1-4, characterized in that, The detection component (500) includes a data acquisition unit (510) and two detection probes (520). The detection probes (520) are electrically connected to the data acquisition unit (510) and to the first excitation winding (200) and the second excitation winding (300), respectively.

10. The testing equipment for sheet-like ferromagnetic magnetic materials according to any one of claims 1-4, characterized in that, The end of the sample (400) extends beyond the first excitation terminal (120) or the second excitation terminal (130).

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