An automated testing device for two-dimensional magnetic properties of a flat plate

Abstract

This invention discloses an automated testing device for the two-dimensional magnetic properties of a flat plate, specifically comprising a magnetic excitation module, a high-precision measurement module, a two-degree-of-freedom automatic control system, and a support and positioning module. The magnetic excitation module includes a magnetic yoke and an excitation coil. The yoke forms mutually perpendicular magnetic flux loops to ensure the strength of the test signal, while the excitation coil provides the excitation setting for the test magnetic field. The high-precision measurement module consists of a magnetic field strength coil and a magnetic induction intensity probe, which acquire magnetic field strength and magnetic induction intensity data in mutually perpendicular directions. The two-degree-of-freedom automatic control system uses a motor drive to achieve precise positioning and automatic measurement of the measurement module at any test point on the horizontal plane. The support and positioning module ensures the installation position between components and serves as a positioning reference for the test sample. This invention has a compact structure, is easy to operate, has wide applicability, and provides good testing results.

Description

Technical Field

[0001] This invention relates to the field of soft magnetic material testing, and in particular to an automated two-dimensional magnetic property testing device for testing soft magnetic materials with high permeability. Background Technology

[0002] Utilizing the high permeability of soft magnetic materials, most of the DC and low-frequency magnetic fields in the environment can be shunted and locked inside the soft magnetic material. Therefore, after constructing a closed structure using soft magnetic materials, a near-zero magnetic space can be obtained inside the closed structure due to the shunting effect. This enables highly efficient shielding against the external magnetic field environment. The constructed zero magnetic space can serve as a fundamental condition for ultra-sensitive measurements, deep space and deep earth exploration, and basic physics research. Therefore, soft magnetic materials play an important role in the field of magnetic shielding. The magnetic properties of soft magnetic materials, such as permeability, coercivity, and saturation magnetic induction, directly determine their magnetic shielding performance. Therefore, accurate, rapid, and comprehensive testing and evaluation of the magnetic properties of soft magnetic materials are of great significance.

[0003] Traditional soft magnetic measurement devices typically operate on specially designed standard test rings (GB / T13012-2008). Utilizing the transformer principle, excitation and test coils are uniformly and densely wound onto the test ring. After applying forward and reverse currents to the excitation coil via a power module, the induced magnetic field of the test coil is obtained using a data acquisition module, thus yielding the material's complete hysteresis loop, from which the material's magnetic properties can be calculated. The drawbacks of this type of testing device are: 1) It limits the test objects, requiring a specially designed standard test ring, and cannot directly reflect the material properties of flat plate structures (shielded mounting modules); 2) Each test requires winding, resulting in low testing efficiency and introducing human stress errors. To overcome the shortcomings of traditional soft magnetic measurement devices, some research teams have begun researching flat plate testing devices. Gmyrek's team used a high-permeability material to create an auxiliary magnetic yoke module, building a testing device that can directly obtain the magnetic properties of a flat plate. A coil wound around the flat plate sample provides the excitation magnetic field and acquires the test data (Gmyrek Z, Cavagnino A. Modified singlesheet tester system for engineering measurements [C] / / XXIIth International Conference on Electrical Machines (ICEM'2016). IEEE, 2016.). Mailhé's team designed a magnetic field strength testing coil based on the flat plate testing device to accurately obtain the magnetic field strength on the flat plate sample (BJ Mailhé, Elias R, Silva I, et al. Influence of Shielding on the Magnetic Field Measurement by Direct H-Coil Method in Double-Yoked SST [C] / / MOMAGPortoAlegre 2016.). The flat plate testing device can directly test the magnetic properties of the shielded mounting module, but it still has certain limitations: (1) The device needs to wind an induction coil on the flat plate sample, so the testing efficiency is still low and the winding stress is introduced; (2) The current flat plate testing device can only obtain the performance of the whole flat plate and cannot perform single-point or local evaluation, while single-point or local testing is of great significance for defect location. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes an automated testing device for the two-dimensional magnetic properties of a flat plate. This device enables automated testing of flat plate soft magnetic samples and allows for the measurement of the complete magnetic properties of the flat plate sample by changing the excitation direction of the applied two-dimensional magnetic field. The device has a simple structure, is easy to operate, and has strong applicability.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] An automated testing device for the two-dimensional magnetic properties of a flat plate includes a magnetic excitation module, a high-precision measurement module, a two-degree-of-freedom automatic control system, and a support and positioning module.

[0007] The magnetic excitation module is fixed to the support positioning module via a positioning groove on the support base. The non-magnetic slide rail in the two-degree-of-freedom automatic control system is fixed to the support positioning module by bolts. The high-precision measurement module can slide freely along the drive shaft direction by cooperating with the shaft hole of the drive shaft. The non-magnetic slider is fixedly connected to the drive shaft with screws. The horizontal two degrees of freedom of the high-precision measurement module is precisely controlled by manipulating the position of the non-magnetic slider in the two-degree-of-freedom automatic control system. The magnetic excitation module provides an excitation magnetic field for the test sample. The high-precision measurement module captures the magnetic field strength and magnetic induction intensity at each measurement point on the test sample. The two-degree-of-freedom automatic control system realizes automated measurement of each area of ​​the flat sample.

[0008] Furthermore, the magnetic excitation module consists of an upper magnetic yoke, an excitation coil, and a lower magnetic yoke. The lower magnetic yoke is fixed to the support positioning module by a positioning groove on the support base. The excitation coil is evenly wound on the upper and lower magnetic yokes. During the test, the test sample is first placed on the upper surface of the lower magnetic yoke, and then the magnetic yoke is pressed onto the test sample. The edges of the upper and lower magnetic yokes are kept symmetrically aligned. After the excitation current is applied to the excitation coil, the upper magnetic yoke, the lower magnetic yoke, and the test sample form a magnetic flux loop, thereby generating a uniform excitation magnetic field within the test sample.

[0009] Furthermore, the pressing force between the upper yoke and the test sample is 100–200 N; the upper and lower yokes are made of high-permeability soft magnetic materials.

[0010] Furthermore, the high-permeability soft magnetic material is a non-oriented silicon steel sheet or a high-permeability iron-nickel alloy.

[0011] Furthermore, by employing a two-dimensional structure with two pairs of mutually perpendicular magnetic yokes, the excitation amplitude of the magnetic field in two directions can be controlled by adjusting the current magnitude of the excitation coils on the two pairs of magnetic yokes, thereby controlling the direction and magnitude of the magnetic field entering the test sample and realizing two-dimensional magnetic property measurement.

[0012] Furthermore, to improve the magnetic field uniformity inside the test sample, the upper and lower magnetic yokes adopt a wide-side design, with the length K of the wide side being a reference dimension of 220–300 mm.

[0013] Furthermore, the two-degree-of-freedom automatic control system comprises a drive motor, a two-degree-of-freedom non-magnetic slide rail, a non-magnetic slider, a drive shaft, and a corresponding control system. The two-degree-of-freedom non-magnetic slide rail is fixedly connected to the support and positioning module via screws. The drive motor, through a drive screw transmission component, allows the non-magnetic slider to move freely on the non-magnetic slide rail. The non-magnetic slider is fixedly connected to the drive shaft with screws, thereby controlling the drive shaft to move within the planar two-degree-of-freedom region. The drive shaft and the measurement component are connected via a hole-shaft fit. The drive motor enables the high-precision measurement module to move at any position within the planar two-degree-of-freedom region, allowing selection of any measurement point on the test sample. The control system, in conjunction with the system, sets different testing schemes for different areas of the test sample, achieving fully automatic measurement. The shielded drive motor extends beyond the lower magnetic yoke.

[0014] Furthermore, the support positioning module includes a support base, alignment strips, and connecting shafts. There are two support bases, fixedly connected by bolts via the connecting shafts. There are four alignment strips, fixedly connected to the support bases by bolts. The support bases support the entire testing device, ensuring the relative positional relationship of the two pairs of vertical lower magnetic yokes through positioning grooves on the support bases. The stepped structure of the support bases controls the gap between the two pairs of lower magnetic yokes, facilitating heat dissipation from the excitation coils. The alignment strips are used for boundary-limited positioning of the test sample. As a positioning reference for the test sample, the alignment strips accurately obtain the relative positional relationship between each test point on the test sample and the measuring component 8, facilitating rapid location of test defect areas. The sides of the alignment strips cooperate with the upper and lower magnetic yokes, ensuring the installation positional relationship between the upper and lower magnetic yokes, reducing alignment errors, and ensuring magnetic flux continuity between the test sample and the upper and lower magnetic yokes at the contact position.

[0015] Furthermore, the high-precision measurement module includes a measurement component comprising a measurement base, a magnetic induction intensity probe, a magnetic field strength test coil, a drive slider, a guide shaft, and a non-magnetic electric actuator. The magnetic induction intensity probe is fixedly connected to the measurement base by adhesive, and the magnetic field strength test coil is fixedly connected to the measurement base by countersunk screws, thereby forming an integrated testing structure from the measurement base, the magnetic induction intensity probe, and the magnetic field strength test coil. One end of the non-magnetic electric actuator is fixedly connected to the drive slider via a flange, and the other end is connected to the measurement base via bolts. The guide shaft is connected to the drive slider... The measuring base, magnetic field strength test coil, and guide shaft are connected by a threaded connection, forming a precision hole-shaft fit. A non-magnetic electric actuator pushes the overall test structure, consisting of the measuring base, magnetic induction intensity probe, and magnetic field strength test coil, to move along the direction of the guide shaft, enabling the measuring components to approach the test sample for measurement. There are two pairs of magnetic induction intensity probes, which test the magnetic induction intensity in two perpendicular directions respectively. Driven by the non-magnetic electric actuator, the magnetic induction intensity probe tip contacts and contracts with the test sample, forming an electrical conduction path, obtaining the potential difference between the contact points, and further calculating the magnetic induction intensity between the test points.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. This invention tests flat plate samples and can obtain the true magnetic permeability of the actual installation structure of the sample without the need to separately manufacture a standard test ring.

[0018] 2. By introducing an automated structure, this invention enables automatic magnetic field excitation, automatic proximity of the measurement module to the sample, and automatic signal capture, eliminating the need for winding wires, reducing the impact of human factors during testing, and improving testing convenience and reliability.

[0019] 3. This invention uses a two-degree-of-freedom slide rail to achieve multi-point testing of the test sample, enabling separate testing of each area of ​​the test sample, obtaining local defects of the test sample, and making the test data more comprehensive and reliable.

[0020] 4. The present invention adopts a two-dimensional magnetic performance testing scheme. By adjusting the magnitude of the excitation magnetic field component and changing the direction of the excitation magnetic field, the anisotropic magnetic characteristic data of the test sample can be obtained, and the loss parameters under the rotating magnetic field can be obtained.

[0021] 5. The induction coil in this invention adopts a gradient pairing design structure, which improves the test accuracy.

[0022] 6. The present invention can adjust the test area of ​​the test sample according to the needs, and there is no limitation on the size of the test sample, which improves the applicability of the test object. Attached Figure Description

[0023] Figure 1This is a three-dimensional schematic diagram of the overall structure of an automated testing device for two-dimensional magnetic properties of a flat plate according to the present invention.

[0024] Figure 2 This is a schematic diagram of the magnetic excitation module of the present invention;

[0025] Figure 3 AA is a cross-sectional view of the present invention;

[0026] Figure 4 BB is a cross-sectional view of the present invention;

[0027] Figure 5 This is a schematic diagram of the high-precision measurement module of the present invention;

[0028] Figure 6 This is a schematic diagram of the testing operation of the high-precision measurement module of the present invention; wherein, Figure a shows the state in which the measurement module is far away from the sample to be tested, and Figure b shows the state in which the measurement module is close to the sample to be tested;

[0029] Figure 7 This is a schematic diagram illustrating the principle of magnetic field strength testing for the sample of the present invention.

[0030] Figure 8 This is a schematic diagram of the magnetic field strength testing coil of the present invention.

[0031] In the diagram: 1. Upper yoke; 2. Excitation coil; 3. Lower yoke; 4. Support base; 5. Alignment bar; 6. Connecting shaft; 7. Drive motor; 8. Measuring component; 9. Non-magnetic slider; 10. Drive shaft; 11. Non-magnetic slide rail; 12. Test sample; 13. First coil; 14. Second coil; 8-1. Measuring base; 8-2. Magnetic induction intensity probe; 8-3. Magnetic field strength test coil; 8-4. Drive slider; 8-5. Guide shaft; 8-6. Non-magnetic electric actuator. Detailed Implementation

[0032] The present invention will become clearer from the following detailed description with reference to the accompanying drawings and preferred embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0033] like Figures 1-5 As shown, the automated testing device for two-dimensional magnetic properties of a flat plate according to the present invention includes a magnetic excitation module, a high-precision measurement module, a two-degree-of-freedom automatic control system, and a support positioning module.

[0034] The connection relationships between the modules are as follows: the magnetic excitation module is fixed to the support positioning module through the positioning groove on the support base 4; the non-magnetic slide rail 11 in the two-degree-of-freedom automatic control system is fixed to the support positioning module by bolts; the high-precision measurement module can slide freely along the drive shaft direction by cooperating with the shaft hole of the drive shaft 10; the non-magnetic slider 9 is fixedly connected to the drive shaft 10 with screws; the horizontal two degrees of freedom of the high-precision measurement module can be precisely controlled by manipulating the position of the non-magnetic slider 9 in the two-degree-of-freedom automatic control system.

[0035] The working principle of the automated testing device for two-dimensional magnetic properties of a flat plate is as follows: the magnetic excitation module provides an excitation magnetic field to the test sample 12, the high-precision measurement module captures the magnetic field strength H and magnetic induction intensity B at each measurement point on the test sample 12, and the two-degree-of-freedom automatic control system realizes the automated measurement of each area of ​​the flat plate sample, thereby realizing the overall function of the automated testing device for two-dimensional magnetic properties of a flat plate.

[0036] like Figure 1 and Figure 2 As shown, the magnetic excitation module consists of an upper magnetic yoke 1, an excitation coil 2, and a lower magnetic yoke 3. The lower magnetic yoke 3 is fixed to the support positioning module via a positioning groove on the support base 4. The excitation coil 2 is positioned according to... Figure 2 The magnetic yoke 1 is uniformly wound around each yoke. During testing, the test sample 12 is first placed on the upper surface of the lower yoke 3, and then the yoke 1 is pressed onto the test sample. The edges of the upper and lower yokes should be symmetrically aligned. The pressing force between the upper yoke 1 and the test sample 12 is preferably 100-200 N. The upper yoke 1 and lower yoke 3 are made of high-permeability soft magnetic materials (including but not limited to non-oriented silicon steel sheets, high-permeability iron-nickel alloys, etc.). Figure 2 As shown, after applying an excitation current to the excitation coil 2, a magnetic flux loop is formed by the upper yoke 1, the lower yoke 3, and the test sample 12, thereby generating a uniform excitation magnetic field within the test sample. Figure 1 and Figure 3 As shown, to realize the magnetic properties of the test sample 12 under different excitation magnetic field directions, this invention uses two pairs of magnetic yokes placed perpendicularly to each other. By adjusting the current of the excitation coils 2 on the two pairs of magnetic yokes, the excitation amplitude of the magnetic field in two directions can be controlled, thereby controlling the direction and magnitude of the magnetic field entering the test sample 12 and realizing two-dimensional magnetic property measurement. To improve the magnetic field uniformity inside the test sample 12, the upper magnetic yoke 1 and the lower magnetic yoke 3 adopt a wide-side design, and the length K of the wide side is referenced to be 220-300 mm.

[0037] like Figure 3As shown, the two-degree-of-freedom automatic control system consists of a drive motor 7, a two-degree-of-freedom non-magnetic slide rail 11, a non-magnetic slider 9, a drive shaft 10, and a corresponding control system. The two-degree-of-freedom non-magnetic slide rail 11 is fixedly connected to the support and positioning module by screws. The drive motor 7 drives a lead screw transmission component, allowing the non-magnetic slider 9 to move freely on the non-magnetic slide rail 11. The non-magnetic slider 11 and the drive shaft 10 are fixedly connected by screws, thus the drive motor 7 can control the movement of the drive shaft 10 within the two-degree-of-freedom plane. The drive shaft 10 and the measuring component 8 are connected by a hole-shaft fit, therefore, the drive motor 7 can be used to move the measuring module at any position within the two-degree-of-freedom plane, used to select any measurement point on the test sample 12 (e.g., ...). Figure 4 (As shown). With the assistance of the control system, different testing schemes for different areas of the test sample 12 can be set, and fully automated measurement can be achieved. For example... Figure 3 As shown, the shielded drive motor 7 extends beyond the lower yoke 3. Through the further shielding effect of the yoke, the influence of the drive motor on the measuring component 8 is minimized.

[0038] like Figure 4 As shown, the support positioning module of the present invention includes a support base 4, alignment strips 5, and a connecting shaft 6. There are two support bases 4, which are fixedly connected by bolts via the connecting shaft 6. There are four alignment strips 5, which are fixedly connected to the support base 4 by bolts. The support base 4 supports the entire testing device. The positioning groove on the support base 4 ensures the relative positional relationship of the two pairs of vertical lower magnetic yokes 3, and the stepped structure of the support base 4 controls the gap between the two pairs of lower magnetic yokes 3, facilitating heat dissipation of the excitation coil 2. Since the alignment strips 5 provide boundary limits for the test sample 12, the alignment strips 5 can serve as a positioning reference for the test sample 12. This allows for precise acquisition of the relative positional relationship between each test point on the test sample 12 and the measuring component 8, facilitating rapid location of test defect areas. The sides of the alignment strip 5 are fitted with the upper yoke 1 and the lower yoke 3. Using the alignment strip 5 ensures the proper installation position of the upper yoke 1 and the lower yoke 3, thereby reducing alignment errors and ensuring magnetic flux continuity between the test sample 12 and the upper and lower yokes 1 and 3 at the contact point. The four alignment strips 5 can be selected and installed according to the size of the test sample 12 and the number of upper and lower yokes 1 and 3 used. After the connecting shaft 6 connects to the support base 4, it forms the support base structure for the test sample. Besides reducing weight and increasing the strength of the support base structure, the connecting shaft 6 also facilitates the handling of the testing device.

[0039] like Figure 5As shown, the high-precision measurement module mainly consists of measurement components 8, including a measurement base 8-1, a magnetic induction intensity probe 8-2, a magnetic field strength test coil 8-3, a drive slider 8-4, a guide shaft 8-5, and a non-magnetic electric push rod 8-6. The magnetic induction intensity probe 8-2 is fixedly connected to the measurement base 8-1 by adhesive, and the magnetic field strength test coil 8-3 is fixedly connected to the measurement base 8-1 by countersunk screws. Thus, the measurement base 8-1, the magnetic induction intensity probe 8-2, and the magnetic field strength test coil 8-3 form an integrated testing structure. One end of the non-magnetic electric actuator 8-6 is fixedly connected to the drive slider 8-4 via a flange, and the other end is connected to the measuring base 8-1 via bolts. The guide shaft 8-5 is threadedly connected to the drive slider. The measuring base 8-1, the magnetic field strength test coil 8-3, and the guide shaft 8-5 are precision-machined. Therefore, under the action of the non-magnetic electric actuator 8-6, the test structure consisting of the measuring base 8-1, the magnetic induction intensity probe 8-2, and the magnetic field strength test coil 8-3 can be pushed to move along the direction of the guide shaft 8-5, thereby realizing the measurement action of the measuring component 8 approaching the test sample 12. Figure 6 As shown in Figure a, where Figure a represents the state where the measuring component 8 is away from the test sample 12, and Figure b represents the state where the measuring component 8 is close to the test sample, it can be used with a two-degree-of-freedom automatic control system to achieve fully automatic measurement. The magnetic induction intensity probe 8-2 has two pairs (4 pins), which respectively measure the magnetic induction intensity B in two perpendicular directions. Driven by the non-magnetic electric actuator 8-6, the pin tip of the magnetic induction intensity probe 8-2 contacts and retracts with the test sample 12, forming an electrical conduction path. From this, the potential difference between the contact points can be obtained, and the magnetic induction intensity B between the test points can be further calculated.

[0040] According to the boundary conditions of Maxwell's equations, the magnetic field strength H is the same at the interface between different magnetic media of different media, and near the interface, the magnetic field strength H changes linearly with the distance L from the interface. Figure 7 As shown. Therefore, in order to improve the testing accuracy of the magnetic field strength testing coil, the magnetic field strength testing coil 8-3 is designed as two stacked layers, i.e., a magnetic field strength gradient structure. The distance between the upper coil and the test sample 12 is L1, and the obtained test signal is U1; the distance between the lower coil and the test sample 12 is L2, and the obtained test signal is U2, as shown. Figure 8 As shown, each layer is wound with two sets of mutually perpendicular first coils 13 and second coils 14, which are used to test the magnetic field strength H in two perpendicular directions of the test sample 12. The two layers of magnetic field strength test coils 8-3 stacked together can be used to correct the distance between the magnetic field strength and the measurement interface of the test sample 12, so as to obtain the true magnetic field strength of the test sample 12 and improve the test accuracy.

[0041] In practice, the number of magnetic yokes and test devices can be adjusted according to requirements to change to unidirectional magnetic property testing for testing of isotropic soft magnetic materials.

[0042] It will be understood by those skilled in the art that the above descriptions are merely preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. An automated testing device for the two-dimensional magnetic properties of a flat plate, characterized in that: It includes a magnetic excitation module, a high-precision measurement module, a two-degree-of-freedom automatic control system, and a support and positioning module; The magnetic excitation module is fixed to the support positioning module via a positioning groove on the support base. The non-magnetic slide rail in the two-degree-of-freedom automatic control system is fixed to the support positioning module by bolts. The high-precision measurement module can slide freely along the drive shaft direction by cooperating with the shaft hole of the drive shaft. The non-magnetic slider is fixedly connected to the drive shaft with screws. The horizontal two degrees of freedom of the high-precision measurement module is precisely controlled by manipulating the position of the non-magnetic slider in the two-degree-of-freedom automatic control system. The magnetic excitation module provides an excitation magnetic field for the test sample. The high-precision measurement module captures the magnetic field strength and magnetic induction intensity at each measurement point on the test sample. The two-degree-of-freedom automatic control system realizes automated measurement of each area of ​​the flat sample. The support positioning module includes a support base, alignment strips, and connecting shafts. There are two support bases, fixedly connected by bolts via the connecting shafts. There are four alignment strips, fixedly connected to the support bases by bolts. The support bases support the entire testing device, ensuring the relative position of the two pairs of vertical lower magnetic yokes through positioning grooves. The stepped structure of the support base controls the gap between the two pairs of lower magnetic yokes, facilitating heat dissipation from the excitation coil. The alignment strips are used for boundary-limited positioning of the test sample, serving as a positioning reference for the test sample. This allows for precise determination of the relative position of each test point on the test sample to the measuring components, facilitating rapid location of test defect areas. The sides of the alignment strips engage with the upper and lower magnetic yokes, ensuring the installation position of the upper and lower magnetic yokes, reducing alignment errors, and guaranteeing magnetic flux continuity between the test sample and the upper and lower magnetic yokes at the contact position.

2. The automated testing device for two-dimensional magnetic properties of a flat plate according to claim 1, characterized in that: The magnetic excitation module consists of an upper magnetic yoke, an excitation coil, and a lower magnetic yoke. The lower magnetic yoke is fixed to the support positioning module by a positioning groove on the support base. The excitation coil is evenly wound on the upper and lower magnetic yokes. During the test, the test sample is first placed on the upper surface of the lower magnetic yoke, and then the magnetic yoke is pressed onto the test sample. The edges of the upper and lower magnetic yokes are kept symmetrically aligned. After the excitation current is applied to the excitation coil, the upper magnetic yoke, the lower magnetic yoke, and the test sample form a magnetic flux loop, thereby generating a uniform excitation magnetic field in the test sample.

3. The automated testing device for two-dimensional magnetic properties of a flat plate according to claim 1, characterized in that: The pressing force between the upper yoke and the test sample is 100~200N; the upper and lower yokes are made of high-permeability soft magnetic materials.

4. The automated testing device for two-dimensional magnetic properties of a flat plate according to claim 3, characterized in that: The high-permeability soft magnetic material is a non-oriented silicon steel sheet or a high-permeability iron-nickel alloy.

5. The automated testing device for two-dimensional magnetic properties of a flat plate according to claim 1, characterized in that: A two-dimensional magnetic property measurement is achieved by using two pairs of mutually perpendicular magnetic yokes. By adjusting the current in the excitation coils on the two pairs of magnetic yokes, the excitation amplitude of the magnetic field in two directions is controlled, thereby controlling the direction and magnitude of the magnetic field entering the test sample.

6. The automated testing device for two-dimensional magnetic properties of a flat plate according to claim 1, characterized in that: To improve the uniformity of the magnetic field inside the test sample, the upper and lower magnetic yokes are designed with wide sides, with the length K of the wide side being 220~300mm.

7. The automated testing device for two-dimensional magnetic properties of a flat plate according to claim 1, characterized in that: The two-degree-of-freedom automatic control system consists of a drive motor, a two-degree-of-freedom non-magnetic slide rail, a non-magnetic slider, a drive shaft, and a corresponding control system. The two-degree-of-freedom non-magnetic slide rail is fixedly connected to the support and positioning module via screws. The drive motor, through a drive screw transmission component, allows the non-magnetic slider to move freely on the non-magnetic slide rail. The non-magnetic slider is fixedly connected to the drive shaft with screws, thereby controlling the drive shaft's movement within the two-degree-of-freedom plane. The drive shaft and the measurement component are connected via a hole-shaft fit. The drive motor enables the high-precision measurement module to move at any position within the two-degree-of-freedom plane, allowing selection of any measurement point on the test sample. With the assistance of the control system, different testing schemes for different areas of the test sample are set, achieving fully automatic measurement. The shielded drive motor extends beyond the lower magnetic yoke.

8. The automated testing device for two-dimensional magnetic properties of a flat plate according to claim 1, characterized in that: The high-precision measurement module includes a measurement component consisting of a measurement base, a magnetic induction intensity probe, a magnetic field strength test coil, a drive slider, a guide shaft, and a non-magnetic electric actuator. The magnetic induction intensity probe is fixedly connected to the measurement base by adhesive, and the magnetic field strength test coil is fixedly connected to the measurement base by countersunk screws, thus forming an integrated testing structure. One end of the non-magnetic electric actuator is fixedly connected to the drive slider by a flange, and the other end is connected to the measurement base by a bolt. The guide shaft is threadedly connected to the drive slider, and the measurement base, magnetic field strength test coil, and guide shaft are connected by a precision hole-shaft fit. The non-magnetic electric actuator pushes the integrated testing structure consisting of the measurement base, magnetic induction intensity probe, and magnetic field strength test coil to move along the direction of the guide shaft, realizing the measurement action of the measurement component approaching the test sample. There are two pairs of magnetic induction intensity probes, which test the magnetic induction intensity in two perpendicular directions respectively. Driven by the non-magnetic electric actuator, the magnetic induction intensity probe tip contacts and contracts with the test sample, forming an electrical conduction path, obtaining the potential difference between the contact points, and further calculating the magnetic induction intensity between the test points.

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