Stress sensitivity test method for loss and magnetization characteristics of amorphous nanocrystalline iron core

Abstract

The invention discloses a stress sensitivity test method for loss and magnetization characteristics of an amorphous nanocrystalline iron core, and relates to the field of soft magnetic material performance tests.The method comprises the following steps that stress distribution and size parameters of the iron core are obtained through finite element simulation when different interference fit exists between the amorphous or nanocrystalline iron core and a titanium alloy sleeve set; processing according to the size parameters of the iron core to obtain an iron core sample; assembling the iron core sample, the titanium alloy sleeve group and the patch type pressure sensor; a soft magnetic material magnetic performance testing system is adopted to test loss characteristics and magnetization characteristics of iron core samples excited at different frequencies under different stresses; according to the invention, the stress of the iron core sample can be adjusted and measured, and the quantitative relation of the influence of the radial stress which is approximately uniformly distributed in the amorphous or nanocrystalline iron core on the loss and magnetization characteristics of the iron core can be accurately obtained; therefore, data support is provided for improving the accuracy of optimization design and performance analysis of equipment such as an amorphous alloy high-speed motor and a nanocrystalline high-frequency transformer.

Description

Technical Field

[0001] The present invention relates to the field of soft magnetic material performance testing, and in particular to a stress-sensitive testing method for loss and magnetization characteristics of an amorphous or nanocrystalline iron core. Background Art

[0002] With the advancement of intelligent industrial manufacturing technology, the development of motors towards higher efficiency, higher speed, and higher frequency is an inevitable trend in the future. Currently, non-oriented silicon steel is the most widely used soft magnetic material for motor cores. Its advantage lies in its high saturation magnetic induction intensity, but its high coercivity and conductivity lead to significant core losses. In particular, at high frequencies, the core losses of the motor stator increase dramatically, seriously affecting the efficiency and even safe operation of high-speed motors. However, iron-based amorphous and nanocrystalline alloys are a class of soft magnetic materials with long-range atomic disorder and short-range order. They combine high magnetic permeability with low losses and are considered to be among the soft magnetic materials with the best overall performance.

[0003] Although both iron-based amorphous alloys and nanocrystals have the advantages of low loss and high magnetic permeability, their loss and magnetization characteristics are sensitive to stress. That is, as the internal stress changes, the loss and magnetization characteristics of amorphous alloys and nanocrystal cores will be greatly affected.

[0004] Therefore, quantitative research on the influence of stress on the loss and magnetization characteristics of amorphous alloy and nanocrystalline cores is essential for improving the accuracy of the optimization design and performance analysis of amorphous alloy high-speed motors and nanocrystalline high-frequency transformers and high-frequency filter inductors.

[0005] A limited number of qualitative studies have examined the effects of stress on the core loss characteristics of amorphous alloys and nanocrystalline cores. These studies measured the change in stator core loss by adjusting the interference fit by adjusting the gap size in the aluminum casing. These studies only qualitatively measured how the overall core loss varied with the interference fit, without further investigating the stress distribution and loss magnitude of specific stator core locations. Consequently, it's impossible to quantitatively determine the relationship between stress and core loss. Furthermore, existing experiments show that the stress in the stator core is non-uniform, as is the magnetic flux density distribution within the stator core.

[0006] Therefore, a stress-sensitive testing method for loss and magnetization characteristics of an amorphous or nanocrystalline core is provided to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a stress-sensitive testing method for the loss and magnetization characteristics of an amorphous and nanocrystalline iron core, so as to achieve precise adjustment of the stress magnitude, make the stress of the amorphous and nanocrystalline iron core adjustable and measurable, and test and obtain the loss characteristics and magnetization characteristics of the iron core sample under different uniformly distributed stress conditions, so as to provide data support for improving the accuracy of the optimized design and performance analysis of amorphous alloy high-speed motors, nanocrystalline high-frequency transformers, nanocrystalline high-frequency filter inductors, etc., thereby giving full play to the advantages of low high-frequency loss of amorphous alloys and nanocrystallines.

[0008] To achieve the above objectives, the present invention provides a stress-sensitive testing method for loss and magnetization characteristics of an amorphous nanocrystalline core, comprising the following steps:

[0009] S1: The stress distribution of the annular amorphous or nanocrystalline core and the dimensional parameters of the annular amorphous or nanocrystalline core when there are different interference fits with the titanium alloy sleeve assembly are obtained through finite element simulation;

[0010] S2: Based on the dimensional parameters of the annular amorphous or nanocrystalline core, the core sample is processed according to the specified process, and the dimensional parameters and mass of the core sample are measured;

[0011] S3: Assemble the iron core sample, titanium alloy sleeve assembly and patch pressure sensor;

[0012] S4: Winding the primary winding and secondary winding for testing on the assembled titanium alloy sleeve set;

[0013] S5: Using the soft magnetic material magnetic properties AC test system, the loss characteristics and magnetization characteristics of the core samples with different stress distributions and different frequency excitations are tested.

[0014] Preferably, in step S1, the titanium alloy sleeve assembly includes a titanium alloy outer ring and a titanium alloy inner ring, and the titanium alloy outer ring and the titanium alloy inner ring are both configured as open circular rings, and the size parameters of the circular amorphous or nanocrystalline iron core include the inner diameter of the ring, the outer diameter of the ring and the axial height.

[0015] Preferably, step S1 specifically includes the following steps:

[0016] S11: Simulate the titanium alloy sleeve assembly consisting of a circular amorphous or nanocrystalline iron core, a titanium alloy outer ring, and a titanium alloy inner ring using a finite element model;

[0017] S12: Calculate the stress distribution of the annular amorphous or nanocrystalline core when it has different interference fits with the titanium alloy outer ring and titanium alloy inner ring;

[0018] S13: Evaluate the effects of different interference combinations on the internal stress uniformity of toroidal amorphous or nanocrystalline cores;

[0019] S14: Obtaining size parameters of the annular amorphous or nanocrystalline core according to the evaluation results.

[0020] Preferably, step S2 specifically includes the following steps:

[0021] S21: Selecting materials for the core sample, including iron-based amorphous alloy strips and nanocrystalline alloy strips;

[0022] S22: cutting, laminating, wire cutting, heat treatment, vacuum epoxy dipping, curing and drying, and high-precision grinding are performed on the selected material to obtain an iron core sample with the same size parameters as the annular amorphous or nanocrystalline iron core in step S14;

[0023] S23: Use a high-precision inside micrometer, a high-precision outside micrometer and a balance to measure the iron core sample.

[0024] Preferably, step S3 specifically includes the following steps:

[0025] S31: performing wire cutting on the titanium alloy outer ring and titanium alloy inner ring blanks after grinding with the iron core sample, removing the cylinder walls at both ends of the titanium alloy outer ring and titanium alloy inner ring blanks, retaining short flanges at both ends, and drilling the short flanges to obtain screw holes;

[0026] S32: Wire cutting is performed along the center line of the short flanges at both ends, penetrating the entire cylinder wall of the titanium alloy outer ring and the titanium alloy inner ring to form slender narrow slits on the titanium alloy outer ring and the titanium alloy inner ring respectively;

[0027] S33: Axially groove the inner wall of the titanium alloy outer ring and the outer wall of the titanium alloy inner ring by wire cutting technology to obtain at least one shallow groove, and place the patch pressure sensor in the shallow groove;

[0028] S34: Install the iron core sample in the annular space formed by the titanium alloy outer ring and the titanium alloy inner ring so that the axial center of the iron core sample is aligned with the axial center of the patch pressure sensor;

[0029] S35: Non-magnetic screws are set in the screw holes on both sides of the elongated narrow slot, and the non-magnetic screws are tightened according to the stress target value.

[0030] Preferably, in step S31, the titanium alloy outer ring and the titanium alloy inner ring after being ground with the iron core sample are subjected to wire cutting, and the specific grinding includes the following steps:

[0031] Step 1: Grind the inner diameter of the titanium alloy outer ring according to the outer diameter of the iron core sample, so that the inner diameter of the titanium alloy outer ring is larger than the outer diameter of the iron core sample;

[0032] Step 2: The outer diameter of the titanium alloy inner ring is ground to be smaller than the inner diameter of the core sample according to the inner diameter of the core sample;

[0033] Step 3: Ensure that a small tolerance is provided between the core sample and the titanium alloy outer ring and between the core sample and the titanium alloy inner ring.

[0034] Preferably, in step S33, the width of the shallow groove is greater than the width of the patch pressure sensor, and the depth of the shallow groove is less than the thickness of the patch pressure sensor.

[0035] Preferably, step S5 specifically comprises the following steps:

[0036] S51: Using a soft magnetic material magnetic property test system, the loss characteristics and magnetization characteristics of the core sample under different frequencies are scanned and tested by an amorphous nanocrystalline test method;

[0037] S52: After testing the interference amount corresponding to a group of narrow slit size combinations and the magnetic properties under a specific stress inside the core sample, the interference amount of the titanium alloy outer ring corresponding to another stress calculated in step S12 is adjusted, the non-magnetic screw is adjusted, the elongated narrow slit on the titanium alloy outer ring is contracted, the interference amount corresponding to the titanium alloy outer ring is obtained, and the stress size applied by the titanium alloy outer ring to the core sample is calculated through the reading of the patch pressure sensor on the titanium alloy outer ring;

[0038] S53, according to the interference amount of the titanium alloy inner ring corresponding to the same stress distribution in steps S12 and S52, the non-magnetic screw is adjusted, the elongated narrow slit on the titanium alloy inner ring is expanded, the interference amount corresponding to the titanium alloy inner ring is obtained, the stress size inside the core sample corresponding to different interference amounts is obtained, and the stress size applied by the titanium alloy inner ring to the core sample is calculated through the reading of the patch pressure sensor on the titanium alloy inner ring;

[0039] S54, according to the stress size applied by the titanium alloy outer ring to the core sample in step S52 and the stress size applied by the titanium alloy inner ring to the core sample in step S53, the width of the elongated narrow slit and the internal stress of the core sample are adjusted by adjusting the non-magnetic screw, and the loss characteristics and magnetization characteristics of the core sample under different stresses and different frequencies are repeatedly scanned and tested according to the amorphous nanocrystalline test method until all the interference amount combinations and the loss characteristics and magnetization characteristics of the core sample under different stresses are tested.

[0040] Therefore, the present application adopts the above-mentioned stress-sensitive test method for the loss and magnetization characteristics of the amorphous nanocrystalline core, and has the following beneficial effects:

[0041] (1) This scheme adjusts the size of the narrow gap of the titanium alloy outer ring and the narrow gap of the titanium alloy inner ring respectively, and can obtain different interference combinations between the iron core sample and the titanium alloy outer ring and the titanium alloy inner ring, as well as approximately uniformly distributed radial stress. The calculation results of the finite element stress distribution show that by adjusting the size of the interference combination, the radial stress deviation inside the iron core sample can be controlled within 3%;

[0042] (2) This solution installs patch pressure sensors on the titanium alloy outer ring and the titanium alloy inner ring respectively to directly measure the pressure applied by the titanium alloy outer ring and the titanium alloy inner ring to the iron core sample. After calculation, the stress can be accurately adjusted, and the stress of the iron core sample can be adjusted and measured;

[0043] (3) This scheme uses magnetic performance testing with adjustable radial stress to accurately obtain the quantitative relationship between the influence of radial stress with approximately uniform distribution inside the core sample on the core loss and magnetization characteristics, thereby giving full play to the advantages of low high-frequency loss of amorphous alloys and nanocrystallines, and providing data support for improving the accuracy of optimized design and performance analysis of amorphous alloy high-speed motors, nanocrystalline high-frequency transformers, nanocrystalline high-frequency filter inductors, etc.

[0044] The method scheme of the present invention is further described in detail below through the drawings and examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a flow chart of a stress-sensitive testing method for loss and magnetization characteristics of an amorphous nanocrystalline core according to the present invention;

[0046] Figure 2 A top view of an iron core sample installed in a titanium alloy sleeve assembly according to an embodiment of the present invention;

[0047] Figure 3 is a cross-sectional view of an iron core sample according to an embodiment of the present invention;

[0048] Figure 4 This is a front cross-sectional view of an iron core sample installed in a titanium alloy sleeve assembly according to an embodiment of the present invention;

[0049] Figure 5 This is a left side cross-sectional view of an iron core sample installed in a titanium alloy sleeve assembly according to an embodiment of the present invention;

[0050] Figure 6 This is a rear cross-sectional view of an iron core sample installed in a titanium alloy sleeve assembly according to an embodiment of the present invention;

[0051] Figure 7 This is a schematic diagram of an iron core sample and a patch pressure sensor installed in a titanium alloy sleeve assembly to wind primary and secondary windings in an embodiment of the present invention.

[0052] Among them: 1. Iron core sample; 2. Titanium alloy outer ring; 3. Titanium alloy inner ring; 4. First short flange; 5. First narrow slit; 6. Second short flange; 7. Second narrow slit; 8. First non-magnetic screw; 9. Second non-magnetic screw; 10. First screw hole; 11. Second screw hole; 12. First chip pressure sensor; 13. Second chip pressure sensor; 14. Primary winding; 15. Secondary winding. DETAILED DESCRIPTION

[0053] The method scheme of the present invention is further described below through the drawings and examples.

[0054] Unless otherwise defined, technical terms or scientific terms used in the present invention shall have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

[0055] The words “include” or “comprising” and similar words used in the present invention mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of also including other elements. The orientation or position relationship indicated by the terms “inside”, “outside”, “upper”, “lower”, etc. is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention 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. Therefore, it cannot be understood as a limitation of the present invention. When the absolute position of the described object changes, the relative position relationship may also change accordingly. In the present invention, unless otherwise clearly stipulated and limited, the terms such as “attachment” should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral whole; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0056] Example 1

[0057] like Figure 2-Figure 7 As shown, the testing device includes a titanium alloy outer ring 2, a titanium alloy inner ring 3 and an iron core sample 1 arranged between the titanium alloy outer ring 2 and the titanium alloy inner ring 3. A first narrow slit 5 is provided on the wall of the titanium alloy outer ring 2, and a second narrow slit 7 is provided on the wall of the titanium alloy inner ring 3.

[0058] A first short flange 4 is provided on the two end walls of the titanium alloy outer ring 2, and a second short flange 6 is provided on the two end walls of the titanium alloy inner ring 3. A first screw hole 10 is provided on the first short flange 4. The first non-magnetic screw 8 passes through the first screw hole 10, which can tighten the titanium alloy outer ring 2, thereby applying inward radial stress to the iron core sample 1; a second screw hole 11 is provided on the second short flange 6. The second non-magnetic screw 9 passes through the second screw hole 11, which can expand the titanium alloy inner ring 3, thereby applying outward radial stress to the iron core sample 1.

[0059] A first patch pressure sensor 12 is provided on the inner wall of the titanium alloy outer ring 2, a second patch pressure sensor 13 is provided on the outer wall of the titanium alloy inner ring 3, and a primary winding 14 and a secondary winding 15 are respectively provided on the titanium alloy sleeve group composed of the titanium alloy outer ring 2 and the titanium alloy inner ring 3.

[0060] like Figure 1 As shown, the present invention provides a stress-sensitive testing method for loss and magnetization characteristics of an amorphous nanocrystalline core, comprising the following steps:

[0061] S1: Finite element simulation was used to obtain the stress distribution and dimensional parameters of the annular nanocrystalline core when it had different interference fits with the titanium alloy sleeve assembly;

[0062] In step S1, the titanium alloy sleeve group includes a titanium alloy outer ring 2 and a titanium alloy inner ring 3. The titanium alloy outer ring 2 and the titanium alloy inner ring 3 are both set as open circular rings. The dimensional parameters of the core sample 1 include the inner diameter of the ring, the outer diameter of the ring and the axial height. The inner diameter, outer diameter and axial height of the core sample 1 are 80.0 mm, 90.0 mm and 12.0 mm respectively.

[0063] Step S1 specifically includes the following steps:

[0064] S11: Simulate the annular nanocrystalline core and titanium alloy sleeve assembly using a finite element model;

[0065] S12: Calculate the stress distribution of the annular nanocrystalline core with different interference fits with the titanium alloy sleeve assembly;

[0066] S13: Evaluate the effects of different interference combinations on the internal stress uniformity of nanocrystalline cores;

[0067] S14: Obtaining size parameters of the nanocrystalline core according to the evaluation results.

[0068] S2: Processing the core sample 1 according to the size parameters of the core in a certain process sequence, and measuring the size parameters and mass of the core sample 1;

[0069] Step S2 specifically includes the following steps:

[0070] S21: According to the outer diameter dimension parameter of the core sample 1 calculated in step S1, which is 90.0 mm, the width of the existing specification nanocrystalline alloy strip 1K107 is selected to be 100 mm.

[0071] S22: The selected strip is sequentially cut, laminated, wire-cut, heat-treated, vacuum epoxy-impregnated, cured and dried, and high-precision ground to obtain a core sample 1 consistent with the dimensional parameters of the nanocrystalline core calculated in step S1. In this embodiment, the inner diameter, outer diameter, and thickness of the core sample 1 are 80.0 mm, 90.0 mm, and 12.0 mm, respectively.

[0072] S23: Use a high-precision inside micrometer, a high-precision outside micrometer, and a balance to measure the iron core sample 1.

[0073] Step S23 specifically includes the following steps:

[0074] Step 1: Use a high-precision inside micrometer and outside micrometer to accurately measure the inner diameter, outer diameter and axial height of the core sample 1, so as to subsequently calculate the magnetic path length, magnetic path cross-sectional area, magnetic field strength and magnetic induction strength of the core sample 1;

[0075] Step 2: Use a balance to measure the mass of the iron core sample 1 so as to subsequently calculate the unit mass loss of the iron core sample 1.

[0076] S3: Assemble the iron core sample 1, the titanium alloy sleeve assembly, the first patch pressure sensor 12, and the second patch pressure sensor 13;

[0077] Step S3 specifically includes the following steps:

[0078] S31: Perform wire cutting on the blanks of the titanium alloy outer ring 2 and the titanium alloy inner ring 3 after being ground with the iron core sample 1, remove most of the cylinder wall at both ends of the blanks of the titanium alloy outer ring 2 and the titanium alloy inner ring 3, retain the first short flange 4 on the titanium alloy outer ring 2 and the second short flange 6 on the titanium alloy inner ring 3, and drill the first short flange 4 and the second short flange 6 to obtain a first screw hole 10 and a second screw hole 11, respectively. The axial length of the complete circular ring between the titanium alloy outer ring 2 and the titanium alloy inner ring 3 is 18.0 mm;

[0079] In step S31, the blanks of the titanium alloy outer ring 2 and the titanium alloy inner ring 3 after being ground with the iron core sample 1 are subjected to wire cutting and fine grinding. The specific grinding includes the following steps:

[0080] Step 1: Grind the inner diameter of the titanium alloy outer ring 2 according to the outer diameter of the iron core sample 1, so that the inner diameter of the titanium alloy outer ring 2 is slightly larger than the outer diameter of the iron core sample 1;

[0081] Step 2: Grind the outer diameter of the titanium alloy inner ring 3 according to the inner diameter of the iron core sample 1 so that the outer diameter of the titanium alloy inner ring 3 is slightly smaller than the inner diameter of the iron core sample 1;

[0082] Step 3: Ensure that there are slight tolerances between the iron core sample 1 and the titanium alloy outer ring 2, and between the iron core sample 1 and the titanium alloy inner ring 3, and both are loose fits.

[0083] S32: Performing wire cutting along the centerline of the first short flange 4 and the second short flange 6, penetrating the entire cylinder wall of the titanium alloy outer ring 2 and the titanium alloy inner ring 3, forming a first narrow slit 5 on the titanium alloy outer ring 2 and a second narrow slit 7 on the titanium alloy inner ring 3, and fine grinding the cylinder wall on both sides of the first narrow slit 5 and the second narrow slit 7 so that the sizes of the first narrow slit 5 and the second narrow slit 7 can be accurately measured with an inside micrometer;

[0084] S33: Axially groove the inner wall of the titanium alloy outer ring 2 and the outer wall of the titanium alloy inner ring 3 using a wire cutting technique to obtain three shallow grooves, respectively. The first patch pressure sensor 12 is disposed in the shallow groove on the titanium alloy outer ring 2, and the second patch pressure sensor 13 is disposed in the shallow groove on the titanium alloy inner ring 3, ensuring that the centers of the first patch pressure sensor 12 and the second patch pressure sensor 13 are both located at the axial center positions of the titanium alloy outer ring 2 and the titanium alloy inner ring 3.

[0085] In step S33 , the width of the shallow groove is slightly larger than the width of the first patch pressure sensor 12 and the second patch pressure sensor 13 , and the depth of the shallow groove is slightly smaller than the thickness of the first patch pressure sensor 12 and the second patch pressure sensor 13 .

[0086] S34: Install the iron core sample 1 in the annular space formed by the titanium alloy outer ring 2 and the titanium alloy inner ring 3, so that the axial center of the iron core sample 1 is aligned with the axial centers of the first patch pressure sensor 12 and the second patch pressure sensor 13;

[0087] S35: A first non-magnetic screw 8 is set in the first screw hole 10 on both sides of the first narrow slot 5, and a second non-magnetic screw 9 is set in the second screw hole 11 on both sides of the second narrow slot 7. The first non-magnetic screw 8 and the second non-magnetic screw 9 are tightened according to the stress target value to adjust the size of the first narrow slot 5 on the titanium alloy outer ring 2 and the size of the second narrow slot 7 on the titanium alloy inner ring 3.

[0088] S4: Winding a primary winding 14 and a secondary winding 15 for testing on the assembled titanium alloy sleeve assembly;

[0089] In step S4, when winding the primary winding 14 and the secondary winding 15 for testing on the titanium alloy sleeve group on which the iron core sample 1 is installed, ensure that the primary winding 14 and the secondary winding 15 are not wound too tightly on the titanium alloy outer ring 2 and the titanium alloy inner ring 3, and leave a small gap so that when the first narrow gap 5 is adjusted to shrink the titanium alloy outer ring 2 and the second narrow gap 7 is adjusted to expand the titanium alloy inner ring 3, the primary winding 14 and the secondary winding 15 will not be subjected to mechanical force to scratch the insulation layer of the electromagnetic wire.

[0090] S5: Using the soft magnetic material magnetic properties AC test system, the loss characteristics and magnetization characteristics of the core sample 1 with different stress distributions and different frequency excitations are tested.

[0091] Step S5 specifically includes the following steps:

[0092] S51: Using the soft magnetic material magnetic property test system and in accordance with the national standard "GB / T19346.1-2017 Test method for amorphous nanocrystals Part 1: AC magnetic properties of ring specimens", scan and test the loss characteristics and magnetization characteristics of the core sample 1 at different frequencies;

[0093] S52: After testing the interference fit corresponding to a set of size combinations of the first narrow slit 5 and the second narrow slit 7 in step S51 and the magnetic properties under a certain stress inside the iron core sample 1, according to the interference fit of the titanium alloy outer ring 2 corresponding to another stress calculated in step S12, the first non-magnetic screw 8 is used again to shrink the width of the first narrow slit 5 on the titanium alloy outer ring 2, and the interference fit between the titanium alloy outer ring 2 and the outer circle of the iron core sample 1 is adjusted to a certain calculated value. The specific stress applied by the titanium alloy outer ring 2 to the iron core sample 1 is calculated based on the reading of the first patch pressure sensor 12 on the titanium alloy outer ring 2;

[0094] S53: According to the interference of the titanium alloy inner ring 3 corresponding to the same stress as that in step S52 calculated in step S12, the second narrow slit 7 on the titanium alloy inner ring 3 is expanded using the second non-magnetic screw 9, thereby adjusting the interference between the titanium alloy inner ring 3 and the inner circle of the iron core sample 1 to another calculated value of the same interference combination calculated in step S12, thereby obtaining the stress magnitude of the iron core sample 1 that is approximately uniformly distributed corresponding to the set of interference magnitudes, and calculating the specific stress magnitude applied by the titanium alloy inner ring 3 on the iron core sample 1 through the reading of the second patch pressure sensor 13 on the titanium alloy inner ring 3;

[0095] S54: According to the calculated outer ring stress and inner ring stress size of the pressure tested in step S52 and step S53, the first non-magnetic screw 8 and the second non-magnetic screw 9 are further fine-tuned to fine-tune the width of the first narrow slit 5 on the titanium alloy outer ring 2 and the width of the second narrow slit 7 on the titanium alloy inner ring 3, so that the stress applied by the titanium alloy outer ring 2 and the titanium alloy inner ring 3 to the core sample 1 meets a certain interference amount combined stress size. Repeat the test method according to the national standard "GB / T19346.1-2017 Non-crystalline nanocrystalline test method Part 1: Ring sample alternating current magnetic properties", scan and test the loss characteristics and magnetization characteristics of the core sample 1 under different stresses and different frequencies, until all the calculated interference amount combinations corresponding to the loss characteristics and magnetization characteristics of the core sample 1 under different stresses inside are tested, including the core loss and magnetization characteristics of the core sample 1 when the titanium alloy outer ring 2, the titanium alloy inner ring 3 and the core sample 1 are in loose fit, that is, there is no interference amount.

[0096] Embodiment 2

[0097] The tested core sample 1 is set to be any one of an iron-based amorphous alloy, a permalloy core, a soft magnetic iron-cobalt-vanadium alloy core or a silicon steel sheet laminated core, and the rest of the specific embodiments are the same as embodiment 1.

[0098] Therefore, the stress sensitive test method for the loss and magnetization characteristics of the amorphous nanocrystalline core is adopted, the stress size is accurately adjusted, the stress inside the core sample is adjustable and measurable, the quantitative relationship between the approximately uniformly distributed radial stress inside the amorphous nanocrystalline core and the loss and magnetization characteristics of the core is accurately obtained, so that the advantages of low high-frequency loss of amorphous alloy and nanocrystalline are fully utilized, and data support is provided for improving the accuracy of optimization design and performance analysis of amorphous alloy high-speed motor, nanocrystalline high-frequency transformer, nanocrystalline high-frequency filter inductance, etc.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the method scheme of the present application, but not to limit it. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the method scheme of the present application can still be modified or equivalently replaced, and these modifications or equivalent replacements do not make the modified method scheme deviate from the spirit and scope of the method scheme of the present application.

Claims

1. A stress-sensitive test method for loss and magnetization characteristics of amorphous and nanocrystalline cores, characterized in that: The following steps are involved: S1: The stress distribution of the annular amorphous or nanocrystalline core and the dimensional parameters of the annular amorphous or nanocrystalline core when there are different interference fits with the titanium alloy sleeve assembly are obtained through finite element simulation; S2: Based on the dimensional parameters of the annular amorphous or nanocrystalline core, the core sample is processed according to the specified process, and the dimensional parameters and mass of the core sample are measured; S3: Assemble the iron core sample, titanium alloy sleeve assembly and patch pressure sensor; S4: Winding the primary winding and secondary winding for testing on the assembled titanium alloy sleeve set; S5: Using the soft magnetic material magnetic properties AC test system, the loss characteristics and magnetization characteristics of the core samples with different stress distributions and different frequency excitations are tested.

2. The stress-sensitive testing method for loss and magnetization characteristics of an amorphous nanocrystalline core according to claim 1, characterized in that: In step S1, the titanium alloy sleeve assembly includes a titanium alloy outer ring and a titanium alloy inner ring, both of which are configured as open circular rings, and the size parameters of the circular amorphous or nanocrystalline core include the inner diameter of the ring, the outer diameter of the ring and the axial height.

3. The stress-sensitive testing method for loss and magnetization characteristics of an amorphous nanocrystalline core according to claim 2, characterized in that: Step S1 specifically includes the following steps: S11: Simulate the titanium alloy sleeve assembly consisting of a circular amorphous or nanocrystalline iron core, a titanium alloy outer ring, and a titanium alloy inner ring using a finite element model; S12: Calculate the stress distribution of the annular amorphous or nanocrystalline core when it has different interference fits with the titanium alloy outer ring and titanium alloy inner ring; S13: Evaluate the effects of different interference combinations on the internal stress uniformity of toroidal amorphous or nanocrystalline cores; S14: Obtaining size parameters of the annular amorphous or nanocrystalline core according to the evaluation results.

4. The stress-sensitive testing method for loss and magnetization characteristics of an amorphous nanocrystalline core according to claim 3, characterized in that: Step S2 specifically includes the following steps: S21: Selecting materials for the core sample, including iron-based amorphous alloy strips and nanocrystalline alloy strips; S22: cutting, laminating, wire cutting, heat treatment, vacuum epoxy dipping, curing and drying, and high-precision grinding are performed on the selected material to obtain an iron core sample with the same size parameters as the annular amorphous or nanocrystalline iron core in step S14; S23: Use a high-precision inside micrometer, a high-precision outside micrometer and a balance to measure the iron core sample.

5. A stress-sensitive testing method for loss and magnetization characteristics of an amorphous nanocrystalline core according to claim 1 or claim 2, characterized in that: Step S3 specifically includes the following steps: S31: performing wire cutting on the titanium alloy outer ring and titanium alloy inner ring blanks after grinding with the iron core sample, removing the cylinder walls at both ends of the titanium alloy outer ring and titanium alloy inner ring blanks, retaining short flanges at both ends, and drilling the short flanges to obtain screw holes; S32: Wire cutting is performed along the center line of the short flanges at both ends, penetrating the entire cylinder wall of the titanium alloy outer ring and the titanium alloy inner ring to form slender narrow slits on the titanium alloy outer ring and the titanium alloy inner ring respectively; S33: Axially groove the inner wall of the titanium alloy outer ring and the outer wall of the titanium alloy inner ring by wire cutting technology to obtain at least one shallow groove, and place the patch pressure sensor in the shallow groove; S34: Install the iron core sample in the annular space formed by the titanium alloy outer ring and the titanium alloy inner ring so that the axial center of the iron core sample is aligned with the axial center of the patch pressure sensor; S35: Non-magnetic screws are set in the screw holes on both sides of the elongated narrow slot, and the non-magnetic screws are tightened according to the stress target value.

6. The stress-sensitive testing method for loss and magnetization characteristics of an amorphous nanocrystalline core according to claim 5, characterized in that: In step S31, the titanium alloy outer ring and the titanium alloy inner ring after being ground with the iron core sample are subjected to wire cutting. The specific grinding includes the following steps: Step 1: Grind the inner diameter of the titanium alloy outer ring according to the outer diameter of the iron core sample, so that the inner diameter of the titanium alloy outer ring is larger than the outer diameter of the iron core sample; Step 2: Grind the outer diameter of the titanium alloy inner ring according to the inner diameter of the iron core sample so that the outer diameter of the titanium alloy inner ring is smaller than the inner diameter of the iron core sample; Step 3: Ensure that there are small tolerances between the iron core sample and the titanium alloy outer ring, and between the iron core sample and the titanium alloy inner ring.

7. The stress-sensitive testing method for loss and magnetization characteristics of an amorphous nanocrystalline core according to claim 5, characterized in that: In step S33 , the width of the shallow groove is greater than the width of the patch pressure sensor, and the depth of the shallow groove is less than the thickness of the patch pressure sensor.

8. The stress-sensitive testing method for loss and magnetization characteristics of an amorphous nanocrystalline core according to claim 3, characterized in that: Step S5 specifically includes the following steps: S51: Using the soft magnetic material magnetic property test system, the loss characteristics and magnetization characteristics of the core samples at different frequencies were scanned and tested by the amorphous and nanocrystalline test method; S52: After testing the interference fit corresponding to a set of narrow slit size combinations and the magnetic properties under a specific stress inside the iron core sample, according to the interference fit of the titanium alloy outer ring corresponding to another stress calculated in step S12, the non-magnetic screw is adjusted to shrink the slender narrow slit on the titanium alloy outer ring to obtain the interference fit corresponding to the titanium alloy outer ring, and the stress applied by the titanium alloy outer ring to the iron core sample is calculated using the reading of the patch pressure sensor on the titanium alloy outer ring; S53, according to the interference of the titanium alloy inner ring corresponding to the same stress distribution in step S12 and step S52, adjusting the non-magnetic screw, expanding the slender narrow slit on the titanium alloy inner ring, obtaining the corresponding interference of the titanium alloy inner ring, obtaining the stress inside the iron core sample corresponding to different interferences, and calculating the stress exerted by the titanium alloy inner ring on the iron core sample through the reading of the patch pressure sensor on the titanium alloy inner ring; S54. According to the stress applied to the core sample by the titanium alloy outer ring in step S52 and the stress applied to the core sample by the titanium alloy inner ring in step S53, the width of the slender narrow gap and the internal stress of the core sample are adjusted by adjusting the non-magnetic screws. According to the amorphous nanocrystalline test method, the loss characteristics and magnetization characteristics of the core sample under different stresses and different frequencies are repeatedly scanned and tested until the loss characteristics and magnetization characteristics of the core sample with all interference combinations and different stresses are tested.

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