Loss characteristic testing device and method of amorphous / nanocrystalline alloy core under complex working conditions

Abstract

The application provides a loss characteristic testing device and method of amorphous / nanocrystalline alloy core under complex working conditions, which is used for testing magnetic characteristics and loss characteristics under complex working conditions such as different stresses, temperatures, magnetic field frequencies and magnetic field strengths. The amorphous / nanocrystalline alloy core is very sensitive to stress, and stress is inevitably introduced in the processing process, interference assembly and actual use, which leads to the deterioration of loss performance. In addition, different working temperatures will change the loss performance of the amorphous / nanocrystalline alloy core. The current conventional testing method cannot obtain the influence degree and law of complex working conditions on the magnetic characteristics and loss characteristics of the amorphous / nanocrystalline alloy core. The device provided by the application comprises a high-low temperature box, a force applying device, a magnetic characteristic testing device and a special fixture for a sample, and can obtain the magnetic hysteresis loop, magnetization curve and loss curve of the amorphous / nanocrystalline alloy core sample when the stress and temperature change simultaneously. The device plays an important guiding significance for the design and application of the motor using the amorphous / nanocrystalline alloy core.

Description

Technical Field

[0001] This invention relates to the field of measurement technology for amorphous / nanocrystalline alloy cores, specifically to the testing and analysis of loss characteristics of amorphous / nanocrystalline alloy cores under complex operating conditions such as magnetic fields and temperature, and is applicable to, but not limited to, common grades of amorphous / nanocrystalline materials for motor cores. Background Technology

[0002] The properties of the iron core material are a common foundation for motor characteristic analysis and optimization design. Existing methods for calculating iron core losses are relatively complete, but they are mostly designed for silicon steel sheet cores. The material properties and operating condition sensitivity of amorphous / nanocrystalline alloy cores are significantly different from those of silicon steel. Amorphous / nanocrystalline alloy cores are highly sensitive to stress, and stress is inevitably introduced during processing, interference fits, and actual use, leading to deterioration in loss performance. Furthermore, different operating temperatures will alter the loss performance of amorphous / nanocrystalline alloy cores. The stress and temperature sensitivity of amorphous / nanocrystalline alloys make accurate calculation of core losses extremely difficult. The loss performance of amorphous / nanocrystalline alloy cores in actual use will be severely altered, and the loss characteristics of amorphous strip materials cannot be directly applied.

[0003] The performance of amorphous / nanocrystalline alloy cores is crucial to the entire amorphous / nanocrystalline alloy motor system. However, there is a lack of systematic and in-depth research on the magnetic and loss characteristics of amorphous / nanocrystalline alloy cores under complex operating conditions such as different stresses, temperatures, magnetic field strengths, and magnetic field frequencies. This can easily lead to loss calculation results that do not conform to reality. It is necessary to accurately analyze and characterize the magnetic and loss characteristics of amorphous / nanocrystalline alloy cores under complex operating conditions such as different stresses, temperatures, magnetic field frequencies, and magnetic field strengths, and to establish a more widely applicable and accurate material property model. Summary of the Invention

[0004] This invention provides a device and method for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions. Through this invention, the magnetic and loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions such as different stresses, temperatures, magnetic field frequencies, and magnetic field strengths can be obtained.

[0005] The specific content of this invention is as follows:

[0006] Devices and methods for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions, including a soft magnetic material tester, signal generator, power amplifier, digital power meter, oscilloscope, software control system and negative feedback adjustment system, high and low temperature universal mechanical testing machine, three-jaw chuck, pressure sensor, radial tensile clamp, radial pressure clamp and axial pressure clamp, etc.

[0007] The soft magnetic material tester can apply DC and AC excitation magnetic fields to the sample under test and test the DC and AC magnetic characteristics of the sample under stress.

[0008] When testing the magnetic properties of the soft magnetic material, an excitation coil and an induction coil need to be wound around it.

[0009] The high and low temperature universal mechanical testing machine can apply radial tensile force and axial pressure to the sample being tested, and can also provide a high and low temperature environment for the sample.

[0010] The three-jaw chuck provides radial pressure to the sample. The clamping force of the jaws on the sample is adjusted through the jaw adjustment port. The radial pressure fixture distributes the force evenly on the sample ring, and the corresponding pressure is measured by a pressure sensor. Simultaneously, based on the self-locking capability of the three-jaw chuck, the preload can be stabilized at a set value.

[0011] The three-jaw chuck is placed entirely into a high-low temperature universal testing machine. The three-jaw chuck provides radial pressure, while the universal testing machine provides axial pressure. Simultaneously, the temperature of the sample ring can be adjusted. By using this device to test the sample ring, the magnetic and loss characteristics under the corresponding conditions can be obtained.

[0012] The radial tension clamp, radial pressure clamp, and axial pressure clamp can solve the problems of coil deformation and uneven force distribution on the sample caused by directly applying force. To apply uniform force to the sample under test, a force application clamp is designed based on the typical dimensions of amorphous / nanocrystalline alloy core sample rings. The force application clamp can be made of polytetrafluoroethylene or other high-temperature resistant, high-strength, non-magnetic materials.

[0013] After the tensile, compressive, or temperature environmental parameters have stabilized, the sample should be demagnetized. The demagnetization frequency should be lower than the AC test frequency. After demagnetization, the AC and DC magnetic properties of the sample should be tested using a soft magnetic material tester.

[0014] Record the magnetic and loss characteristics under different stresses and temperatures to obtain the correspondence between the magnetic and loss characteristics of amorphous / nanocrystalline alloy cores and stress and temperature.

[0015] Beneficial effects:

[0016] 1. The present invention provides a device and method for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions, which can realize the testing of magnetic and loss characteristics of amorphous / nanocrystalline alloy cores under constant radial tensile stress, radial compressive stress and axial compressive stress.

[0017] 2. This invention relates to a device and method for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions. It proposes a dedicated fixture and radial pressure testing method. By using the fixture, three-jaw chuck, and high-low temperature universal mechanical testing machine, the force can be evenly applied to the sample while avoiding stress on the coil windings, thus preventing the sample from being affected by concentrated force. The fixture is simple to manufacture and easy to use.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention, the accompanying drawings used will be briefly described below.

[0020] Figure 1 This is a schematic diagram of the testing principle of the device and method for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions according to the present invention.

[0021] Figure 2 This is a schematic diagram of the device and method for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions according to the present invention, showing the application of radial tensile force or the coupling of radial tensile force with temperature.

[0022] Figure 3 This is a schematic diagram of the device and method for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions according to the present invention, which involves applying different temperatures or radial pressure coupled with temperature.

[0023] Figure 4 This is a schematic diagram of the device and method for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions according to the present invention, showing the application of different radial pressures.

[0024] Figure 5 This is a schematic diagram of the radial pressure clamp in this invention;

[0025] Figure 6 This is a test flowchart of the device and method for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions according to the present invention.

[0026] In the diagram: 1-Universal mechanical testing machine, 2-High and low temperature chamber, 3-Radial tensile clamp, 4-Tensile caliper, 5-Radial pressure device, 6-Base, 5-1-Three-jaw chuck, 5-2-Jaw, 5-3-Sample pad, 5-4-Pressure sensor, 5-5-Radial pressure clamp, 5-6-Sample under test, 5-7-Test coil. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] A testing device for the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions includes a soft magnetic material tester, a universal testing machine 1, a three-jaw chuck 5-1, a pressure sensor 5-4, a radial tensile clamp 3, and a radial pressure clamp 5-5. The soft magnetic material tester consists of a signal generator, a power amplifier, a digital power meter, and an oscilloscope.

[0029] like Figure 1 As shown, the present invention discloses a test apparatus and method for the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions. A soft magnetic material tester is constructed using a signal generator, a power amplifier, a digital power meter, and an oscilloscope. An excitation current is applied to the amorphous / nanocrystalline alloy core via an excitation coil, and a magnetic flux signal from the amorphous / nanocrystalline alloy core is sensed by an induction coil. Combined with a universal mechanical testing machine 1, a high and low temperature chamber 2, and a radial pressure device 5, the hysteresis loop, magnetization curve, and loss curve of the tested amorphous / nanocrystalline alloy core sample under simultaneous stress and temperature variations can be measured. This allows for the acquisition of the magnetic and loss characteristics of the amorphous / nanocrystalline alloy core under complex working conditions such as different stresses, temperatures, magnetic field frequencies, and magnetic field strengths. The signal generator is connected to the power amplifier. One end of the power amplifier is sequentially connected to the digital power meter, the excitation coil, and the other end of the power amplifier. The excitation coil is wound around the amorphous / nanocrystalline alloy core. An induction coil is also wound around the amorphous / nanocrystalline alloy core. One end of the induction coil is sequentially connected to the oscilloscope and the other end of the induction coil. The radial pressure device 5 consists of a radial pressure clamp 5-5 and a test sample 5-6.

[0030] The soft magnetic material tester can apply DC and AC excitation magnetic fields to the sample 5-6 under test to test the DC and AC magnetic properties of the sample under stress. The sample 5-6 under test is an amorphous / nanocrystalline alloy core.

[0031] The magnetic properties of the soft magnetic material need to be tested by winding an excitation coil and an induction coil around it. The test coil 5-7 consists of an excitation coil and an induction coil.

[0032] like Figure 2 As shown, this system enables the application of radial tensile force or radial tensile force coupled with temperature testing. The radial tensile force clamp 3 and the test sample 5-6 are installed in the tensile force caliper 4. A specified tensile force is applied through the universal testing machine 1. Figure 1 The soft magnetic material tester can test the magnetic and loss characteristics of amorphous / nanocrystalline alloy cores under different tensile stresses. The universal mechanical testing machine 1 contains a high and low temperature chamber 2. Tensile clamps 4 are located inside the high and low temperature chamber 2. Together with the high and low temperature chamber 2, the magnetic and loss characteristics of amorphous / nanocrystalline alloy cores under tensile stress and at different temperatures can be tested. The universal mechanical testing machine 1 is a high and low temperature universal mechanical testing machine 1. The high and low temperature universal mechanical testing machine 1 can apply radial tensile force and axial compressive force to the sample being tested, while the high and low temperature chamber 2 provides a high and low temperature environment for the sample. Figure 3-4As shown, radial pressure or radial pressure coupled with temperature testing can be performed. The three-jaw chuck 5-1 provides radial pressure to the sample under test. By adjusting the clamping force of the jaws 5-2, the force is evenly distributed on the sample 5-6 via the radial pressure fixture 5-5, and the corresponding pressure is measured by the pressure sensor 5-4. Simultaneously, based on the self-locking capability of the three-jaw chuck 5-1, the preload can be stabilized at a set value, allowing for the testing of the magnetic and loss characteristics of amorphous / nanocrystalline alloy cores under compressive stress. The entire three-jaw chuck 5-1 is placed in the high and low temperature universal testing machine 1. The radial pressure is provided by the three-jaw chuck, and the axial pressure is provided by the universal testing machine 1. The sample ring temperature can be adjusted simultaneously, allowing for the testing of the magnetic and loss characteristics of amorphous / nanocrystalline alloy cores under compressive stress and at different temperatures. A base 6 is provided in the high and low temperature chamber 2, and the radial pressure fixture is placed on the base 6. The three-jaw chuck 5-1 includes jaws 5-2, a sample pad 5-3, a pressure sensor 5-4, a radial pressure clamp 5-5, a sample to be tested 5-6, and a test coil 5-7. The three-jaw chuck 5-1 has a central annular radial pressure clamp 5-5, with an annular groove inside for placing the sample to be tested 5-6. The test coil 5-7 is wound around the sample to be tested 5-6. Multiple jaws 5-2 are evenly arranged on the outer periphery of the radial pressure clamp 5-5. The sample pad 5-3 is placed between the pressure clamp 5-5 and the jaws 5-2. A contact pressure sensor 5-4 is mounted on each jaw 5-2. The contact pressure sensor 5-4 is connected to the radial pressure clamp 5-5.

[0033] like Figure 5 As shown, to facilitate winding, the radial pressure fixture 5-5 has slots on its circumferential surface. The slots are left open at positions not in contact with the sample to facilitate winding. At the contact points with the sample, a certain distance is left between the slots and the surface to avoid concentrated stress on the sample from the fixture. The slot spacing angle is designed according to the required number of coil turns for the sample to ensure the coil is evenly wound around the sample. After the coil is wound, the fixture and the sample are tightly connected via the coil.

[0034] The size of the sample tensile test fixture is customized according to the size of the sample.

[0035] like Figure 6 As shown, the present invention uses the above-mentioned device for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions, and the method for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions of the present invention includes the following testing steps:

[0036] (1) Prepare a material ring sample of the required size and process a fixture of the corresponding size. Wind the sample according to the number of turns requirement. Connect the excitation coil and the induction coil to the magnetic property tester.

[0037] (2) According to the test requirements, the sample is matched with the radial pressure fixture and installed on the three-jaw chuck. The magnetic properties under radial pressure are tested. After the pressure value stabilizes, the sample is demagnetized. After demagnetization, the AC and DC magnetic properties of the sample are tested by a soft magnetic material tester.

[0038] (3) According to the test requirements, the sample is fitted with the radial tensile clamp and installed in the high and low temperature universal mechanical testing machine (0 to 50kN) to test the magnetic properties under radial tensile force. After the tensile force value stabilizes, the test steps are the same as step (2).

[0039] (4) According to the test requirements, place the sample in a high and low temperature chamber (-50℃ to 200℃) to provide different temperature environments and test the magnetic properties under different temperature environments. After the temperature value stabilizes, the test steps are the same as step (2).

[0040] (5) According to the test requirements, install the sample into the three-jaw chuck, put the whole into the high and low temperature chamber, provide different temperature environments through the high and low temperature chamber, test the magnetic properties under radial pressure and temperature environment, and after the pressure and temperature values ​​are stable, the test steps are the same as step (2).

[0041] (6) According to the test requirements, the sample is installed in the high and low temperature universal mechanical testing machine to apply tension. The machine provides different temperature environments through its own temperature chamber. The radial pressure and magnetic properties under temperature environment are tested. After the pressure and temperature values ​​are stable, the test steps are the same as step (2).

[0042] (7) By recording the magnetic properties and loss characteristics under different stresses and temperatures, the corresponding relationship between the loss characteristics of amorphous / nanocrystalline alloy cores and stress and temperature can be obtained.

[0043] The present invention provides a device and method for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions. It can measure the magnetic and loss characteristics of amorphous / nanocrystalline alloy core sample rings under high and low temperature environments when they are simultaneously subjected to radial and axial pressure or to radial and axial pressure alone.

[0044] 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. A device for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions, characterized in that, This includes a soft magnetic material tester, a universal mechanical testing machine, a three-jaw chuck, a pressure sensor, and a radial tensile clamp; The soft magnetic material tester is used to apply DC and AC excitation magnetic fields to the sample under test and test the DC and AC magnetic properties of the sample under stress. The universal mechanical testing machine is used to apply radial tensile force and axial compressive force to the sample under test, and can also provide a variable temperature environment for the sample; The three-jaw chuck is used to provide radial pressure to the sample under test. The clamping force of the jaws on the sample under test is adjusted by the jaw adjustment port. The radial pressure fixture distributes the force evenly on the sample ring, and the corresponding pressure is measured by the pressure sensor. The universal mechanical testing machine is equipped with a high and low temperature chamber. The tensile clamp is located in the high and low temperature chamber. The radial pressure fixture has grooves on its circumferential surface. The grooves are opened at the positions that do not contact the sample. The grooves at the positions that contact the sample are left with a distance from the surface to avoid the sample being subjected to concentrated stress from the fixture. The spacing angle between the grooves is designed according to the number of coil turns required by the sample to ensure that the coil is evenly wound around the sample. After the coil is wound, the fixture and the sample under test are connected together by the coil.

2. The apparatus according to claim 1, characterized in that, The three-jaw chuck has a self-locking capability, which can fix the preload force at a set value.

3. The apparatus according to claim 1, characterized in that, The soft magnetic material tester consists of a signal generator, a power amplifier, a digital power meter, and an oscilloscope. The signal generator is connected to the power amplifier. One end of the power amplifier is connected in sequence to the digital power meter, the excitation coil, and the other end of the power amplifier. The excitation coil is wound on an amorphous / nanocrystalline alloy core. An induction coil is also wound on the amorphous / nanocrystalline alloy core. One end of the induction coil is connected in sequence to the oscilloscope and the other end of the induction coil.

4. The apparatus according to claim 1, characterized in that, The radial tensile clamp and the sample under test are installed in the tensile caliper. A predetermined tensile force is applied by a universal testing machine, and the magnetic properties and loss characteristics of the amorphous / nanocrystalline alloy core under different tensile stresses are tested by a soft magnetic material tester.

5. The apparatus according to claim 1, characterized in that, The three-jaw chuck includes jaws, a sample pad, a pressure sensor, a radial pressure clamp, a sample to be tested, and a test coil. The three-jaw chuck has a central annular radial pressure clamp with an internal annular groove for placing the sample. The test coil is wound around the sample. Multiple jaws are evenly distributed around the outer circumference of the radial pressure clamp. A sample pad is placed between the pressure clamp and the jaws. A contact pressure sensor is mounted on the jaws and connected to the radial pressure clamp. The entire three-jaw chuck is placed in a high-low temperature universal testing machine, where the three-jaw chuck provides radial pressure and the universal testing machine provides axial pressure. The sample ring temperature can be adjusted simultaneously, enabling the testing of the magnetic and loss characteristics of amorphous / nanocrystalline alloy cores under compressive stress and at different temperatures.

6. A method for testing the loss characteristics of amorphous / nanocrystalline alloy cores under complex working conditions, characterized in that, Using the apparatus as described in any one of claims 1-5 includes the following steps: (1) Prepare a material ring sample of the required size and process a fixture of the corresponding size. Wind the sample according to the number of turns requirement. Connect the excitation coil and the induction coil to the magnetic property tester. (2) According to the test requirements, the sample is matched with the radial pressure fixture and installed on the three-jaw chuck. The magnetic properties under radial pressure are tested. After the pressure value stabilizes, the sample is demagnetized. After demagnetization, the AC and DC magnetic properties of the sample are tested by a soft magnetic material tester. (3) According to the test requirements, the sample is fitted with the radial tensile clamp and installed in the universal testing machine to test the magnetic properties under radial tensile force. After the tensile force value stabilizes, the sample is demagnetized first. After demagnetization, the AC and DC magnetic properties of the sample are tested by the soft magnetic material tester. (4) According to the test requirements, the sample is placed in a high and low temperature chamber to provide different temperature environments and test the magnetic properties under different temperature environments. After the temperature value stabilizes, the sample is demagnetized first. After demagnetization, the AC and DC magnetic properties of the sample are tested by a soft magnetic material tester. (5) According to the test requirements, install the sample into the three-jaw chuck, put the whole into the high and low temperature chamber, provide different temperature environments through the high and low temperature chamber, test the magnetic properties under radial pressure and temperature environment, after the pressure and temperature values ​​are stable, first demagnetize the sample, and after demagnetization, test the AC and DC magnetic properties of the sample under test through the soft magnetic material tester. (6) According to the test requirements, the sample is installed on the universal testing machine to apply tension. Different temperature environments are provided by the high and low temperature chamber of the testing machine and the temperature chamber. The magnetic properties under radial tension and temperature environment are tested. After the pressure and temperature values ​​are stable, the sample is demagnetized. After demagnetization, the AC and DC magnetic properties of the sample are tested by the soft magnetic material tester. (7) By recording the magnetic properties and loss characteristics under different stresses and temperatures, the corresponding relationship between the loss characteristics of amorphous / nanocrystalline alloy cores and stress and temperature can be obtained.

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