CN114578272A - Device and method for measuring magnetic properties of magnetic material under stress action - Google Patents
Device and method for measuring magnetic properties of magnetic material under stress action Download PDFInfo
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- CN114578272A CN114578272A CN202210173961.7A CN202210173961A CN114578272A CN 114578272 A CN114578272 A CN 114578272A CN 202210173961 A CN202210173961 A CN 202210173961A CN 114578272 A CN114578272 A CN 114578272A
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Abstract
The invention relates to a device for measuring the magnetic property of a magnetic material under the action of stress, which comprises: the device comprises a coil group, a clamp group and a magnetic property tester; the coil group is wound outside the annular tested sample and is used for being connected with the magnetic characteristic tester through a test wire; the magnetic characteristic tester is used for providing exciting current for the coil assembly, detecting induced voltage of the tested sample and testing the magnetic characteristic of the tested sample under the action of stress in real time; the clamp group is used for being matched with a tested sample piece, stress is conveniently applied to the tested sample piece, and therefore stress of the coil group on the tested sample piece is avoided, and force can be uniformly applied to the sample piece. The technical scheme of the invention is convenient to obtain the magnetic properties of the magnetic material such as relative permeability under the action of different stresses, and the like, and obtains the corresponding rule through a plurality of tests, thereby playing an important guiding significance for the design and the construction process of the magnetic shielding device.
Description
Technical Field
The invention relates to the technical field of magnetic permeability measurement of a magnetic material under stress, in particular to a device and a method for measuring the magnetic property of the magnetic material under stress.
Background
For a large magnetic shielding cabin, in order to ensure the requirement of high shielding performance of the cabin on a very low frequency magnetic field, the shielding cabin is generally designed to adopt a multi-layer shielding structure formed by high magnetic conductive materials, and a frame is manufactured by aluminum alloy sections and used for fixing the positions of all shielding layers. Meanwhile, due to the limitation of a processing technology, the size of each magnetic shielding plate is limited, the shielding layer of the large magnetic shielding cabin is generally manufactured into a module in a multi-layer fixed edge distance laminating mode, and the module is fixed on an aluminum alloy frame through screws after a fixing hole and a positioning hole are reserved on the module. Therefore, in the process of building the magnetic shielding cabin, the magnetic shielding material can be influenced by assembling stress of different degrees. The inside of the large magnetic shielding cabin can be used for carrying out scientific experiments or medical examinations and the like, and equipment and personnel often enter and exit the large magnetic shielding cabin, so that extra pressure is introduced to the bottom shielding layer.
In summary, the magnetic materials in the magnetic shielding device are affected by different stresses, mainly in the form of tensile stress and compressive stress, and at this time, the arrangement of the internal magnetic domains of the magnetic materials is changed, so that the movement of the magnetic domain walls is hindered, the magnetic permeability is reduced, the coercive force is improved, and the overall performance of the shielding device is affected.
For permalloy and other high-permeability magnetic materials, the outer annular structure of the test sample piece needs to be wound uniformly around the annular sample piece, so that stress is not easily and directly applied to the tested sample piece, and the current test method can only test the magnetic properties of the magnetic materials in the conventional environment.
Disclosure of Invention
The device and the method for measuring the magnetic properties of the magnetic material under the stress action at least solve the problems that in the related art, the magnetic material is influenced by the stress, the arrangement of an internal magnetic domain is changed, the movement of the magnetic domain wall is hindered, the magnetic conductivity is reduced, the coercive force is improved, and the influence on the overall performance of a shielding device cannot be quantified.
The embodiment of the first aspect of the present application provides a device for measuring magnetic properties of a magnetic material under stress, where the device includes: the device comprises a coil group, a clamp group and a magnetic property tester;
the coil group is wound outside the annular tested sample and is used for being connected with the magnetic characteristic tester through a test wire;
the magnetic characteristic tester is used for providing exciting current for the coil assembly, detecting induced voltage of the tested sample and testing the direct current or alternating current magnetic characteristic of the tested sample under the action of stress in real time;
the clamp group is used for being matched with a tested sample piece, stress is conveniently applied to the tested sample piece, and therefore stress of the coil group on the tested sample piece is avoided, and force can be uniformly applied to the sample piece.
The embodiment of the second aspect of the present application provides a method for measuring magnetic properties of a magnetic material under a stress effect, where the method includes:
designing a tensile test clamp and a pressure test clamp with corresponding sizes according to the size of a sample to be tested;
according to the test requirements, winding is carried out on the tested sample and the clamp, and the excitation coil and the induction coil are respectively connected with a magnetic property tester;
mounting the manufactured sample piece to be tested and the clamp on corresponding tension calipers or pressure plates, and applying tension pressure in the test requirement;
after the tension pressure value is stable, the sample piece is demagnetized, and after the demagnetization is finished, the AC/DC magnetic characteristic of the sample piece to be tested is tested by a magnetic characteristic tester;
and recording the magnetic characteristics under the action of different stresses to obtain a corresponding rule between the measured characteristics of the magnetic material and the stresses.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
the invention provides a device and a method for measuring the magnetic property of a magnetic material under the action of stress, wherein the device comprises a coil group, a clamp group and a magnetic property tester; the coil group is wound outside the annular sample to be tested and is used for being connected with the magnetic characteristic tester through the test wire; the magnetic characteristic tester is used for providing exciting current for the coil assembly, detecting induced voltage of the tested sample and testing the magnetic characteristic of the tested sample under the action of stress in real time; the clamp group is used for being matched with a tested sample piece, stress is conveniently applied to the tested sample piece, and therefore stress of the coil group on the tested sample piece is avoided, and force can be uniformly applied to the sample piece. The technical scheme of the invention can conveniently obtain the relative permeability and other magnetic properties of the magnetic material under different stress effects, and obtain corresponding rules through multiple tests, thereby playing an important guiding significance for the design and construction process of the magnetic shielding device.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a structural diagram of a device for measuring magnetic properties of a magnetic material under stress when a tensile force is applied to a sample to be measured in an apparatus for measuring magnetic properties of a magnetic material under stress according to an embodiment of the present application;
fig. 2 is a structural diagram of a device for measuring the magnetic properties of a magnetic material under stress when pressure is applied to a sample to be measured in the device according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a tensile test fixture and a sample under test in a device for measuring magnetic properties of a magnetic material under stress according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a neutron tension test fixture of a device for measuring magnetic properties of a magnetic material under stress according to an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a pressure test fixture and a sample under test in a device for measuring magnetic properties of a magnetic material under stress according to an embodiment of the present application;
FIG. 6 is a schematic structural diagram of a neutron pressure test fixture of a device for measuring magnetic properties of a magnetic material under stress according to an embodiment of the present application;
FIG. 7 is a flow chart of a method for measuring magnetic properties of a magnetic material under stress according to one embodiment of the present application;
fig. 8 is a flowchart illustrating a method for measuring magnetic properties of a magnetic material under stress according to an embodiment of the present disclosure.
Description of the reference numerals:
a magnetic property tester-1; a tension and pressure loader-2; a tension caliper-3; a tensile test fixture-4; pressure test fixture-5; a pressure plate-6; a tested sample-7; a coil assembly-8; a loader housing-201; a first fixing plate-202; a second fixing plate-203; a sub-tension test fixture-401; inner surface-4011; outer surface-4012; a first mounting groove-4013; smooth-4014; sub-pressure test fixture-501; second mounting slot-5011; platen mounting bar-601.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The application provides a magnetic material magnetic property measuring device under stress effect, includes: a coil group, a clamp group and a magnetic characteristic tester 1; the coil group is wound outside the annular tested sample 7 and is used for being connected with the magnetic characteristic tester 1 through a test wire; the magnetic characteristic tester 1 is used for providing exciting current for the coil assembly, detecting induced voltage of the tested sample and testing the magnetic characteristic of the tested sample 7 under the action of stress in real time; the clamp group is used for being matched with the tested sample 7, stress is conveniently applied to the tested sample, and therefore stress of the coil group on the tested sample 7 is avoided, and force can be uniformly applied to the sample. The technical scheme of the invention is convenient to obtain the magnetic properties of the magnetic material such as relative permeability under the action of different stresses, and the like, and obtains the corresponding rule through a plurality of tests, thereby playing an important guiding significance for the design and the construction process of the magnetic shielding device.
Example 1
Fig. 1 is a structural diagram of a device for applying a tensile force to a sample to be measured in a device for measuring magnetic properties of a magnetic material under stress according to an embodiment of the present disclosure, as shown in fig. 1, the device includes: a coil group, a clamp group and a magnetic characteristic tester 1;
as shown in fig. 7 and 5, the coil assembly is wound around the outside of the ring-shaped sample 7 to be measured for connection to the magnetic characteristic tester 1 through a test wire.
In an embodiment of the present disclosure, the coil assembly includes: the excitation winding coil and the induction winding coil are uniformly and tightly wound on the whole circumference of the tested sample 7 as much as possible so as to reduce the influence of air gaps under the windings; the excitation winding coil wound on the sample 7 to be measured is connected to the magnetic characteristic tester 1 for generating a sufficient excitation magnetic field.
It should be noted that the coil assembly adopts the enameled wire, pay attention to the insulating layer of inspection enameled wire among wire winding and the test procedure, prevent that the coating from droing and leading to being surveyed sample and coil direct intercommunication, cause the short circuit.
The magnetic characteristic tester 1 is used for providing exciting current for the coil assembly, detecting induced voltage of the tested sample and testing the direct current or alternating current magnetic characteristic of the tested sample 7 under the action of stress in real time.
In the embodiment of the present disclosure, the magnetic property tester 1 includes: signal generator, power amplifier, power analyzer, etc., and in other embodiments of the present invention, the magnetic characteristic tester 1 includes, but is not limited to, a signal generator, a power amplifier, a power analyzer, etc.
The power analyzer is connected with the induction winding coil through a test wire and is used for detecting the induction voltage of the tested sample 7;
the signal generator is connected with the power amplifier, is connected with the exciting winding coil through a test wire and is used for applying alternating exciting current to the exciting winding coil, and the relation between the exciting current and the magnetic flux density of the magnetic field strength under different magnetic field strengths is obtained by adjusting the exciting current during testing, so that the power analyzer measures the direct current or alternating current magnetic characteristics of the tested sample 7 under the stress action at the moment.
The clamp group is used for being matched with the tested sample 7, stress is conveniently applied to the tested sample, and therefore stress of the coil group on the tested sample 7 is avoided, and the force can be uniformly applied to the tested sample 7.
In the embodiment of the present disclosure, the clamp group includes a tensile test clamp 4 and a pressure test clamp 5, in this embodiment, the tensile test clamp 4 and the pressure test clamp 5 are both made of a nonmagnetic material of polyetheretherketone, and have the characteristics of easy processing, high mechanical strength, and the like.
Fig. 3 is a schematic structural diagram of a tensile test fixture and a sample to be measured in a magnetic property measurement device for a magnetic material under stress according to an embodiment of the present application, and as shown in fig. 3, the tensile test fixture 4 is disposed in an annular sample to be measured 7 and is used for being matched with the sample to be measured 7 so as to facilitate a tensile force provided by a tensile and compressive loading instrument 7 to the sample to be measured 7.
Tensile test anchor clamps 4 includes two sub tensile test anchor clamps 401, and fig. 4 is according to the structure sketch map of sub tensile test anchor clamps in the magnetic material magnetic property measuring device under the stress effect that an embodiment of this application provided, as fig. 3 and fig. 4, every sub tensile test anchor clamps 401 has internal surface 4011 and surface 4012 just surface 4012 is the curved surface, and two sub tensile test anchor clamps 401 set up in annular tested sample 7 and two sub tensile test anchor clamps 401 have certain distance between in the direction that the surface deviates from relatively outside to guarantee every sub tensile test anchor clamps 401 curved surface and tested sample 7 internal surface adaptation.
A smooth part 4014 is arranged on the outer surface 4012 of each sub-tensile test fixture 401, and the smooth part 4014 is arranged in the middle of the outer surface 4012 along the length direction of the outer surface 4012 and is an installation position of the sample 7 to be tested, namely, the inner wall of the sample 7 to be tested corresponds to the smooth part 4014.
As shown in fig. 1, the tested sample 7 and the tensile test fixture 4 which are fixed together are installed on the tensile and compressive loading instrument 2, so that tensile force can be conveniently applied to the tested sample 7, the situations that the tested sample 7 is not uniformly stressed and a copper wire insulating layer is damaged due to overlarge pressure to cause short circuit when the tensile calipers are directly used for testing are avoided, the tensile test fixture 4 and the tested sample 7 which are fixed together are installed on the tensile and compressive loading instrument 2, the direct current or alternating current magnetic characteristic of the tested sample 7 under the action of tensile force is directly tested in real time through the magnetic characteristic tester 1 after the tensile force is applied to the tested sample 7, and the measurement operation is convenient.
Fig. 5 is a schematic structural view of a pressure test fixture and a sample to be measured in a magnetic material magnetic property measurement apparatus under stress action according to an embodiment of the present application, and as shown in fig. 5, the pressure test fixture 5 is used for being matched with the sample to be measured 7 so as to facilitate a tensile and compressive force loader 2 to provide a tensile and compressive force for the sample to be measured 7.
The second mounting groove 5011 is arranged according to the number of turns of the coil wound on the sample under test 7, the two sub-pressure testing clamps 501 are oppositely arranged in a mode that one side provided with the second mounting groove 5011 deviates, and the sample under test 7 is correspondingly arranged between the two sub-pressure testing clamps 5.
The second mounting slots 5011 are spaced at an angle to ensure that the coil assembly is uniformly wound around the entire circumference of the sample 7, and after the coil assembly is completely wound, the pressure testing fixture 5 is tightly connected to the sample 7.
An excitation winding coil and an induction winding coil are wound on two sub-pressure test fixtures 5 and a tested sample 7 positioned between the two sub-pressure test fixtures 5, the tested sample 7 and the pressure test fixtures 5 are fixed together under the matching action of a coil group and a second mounting groove 5011, the fixed tested sample 7 and the fixed pressure test fixtures 5 are mounted on a tension and pressure loader 2 so as to conveniently apply pressure on the tested sample 7, the situations that the tested sample 7 is unevenly stressed and a copper wire insulating layer is damaged due to overlarge pressure when a pressure plate is directly used for testing are avoided, the fixed pressure test fixtures 5 and the fixed tested sample 7 are mounted on the tension and pressure loader 2, the direct current or alternating current magnetic characteristic of the tested sample 7 under the pressure action is directly tested in real time through a magnetic characteristic tester 1 after the tested sample 7 is applied with pressure, the measurement operation is convenient.
In the embodiment of the present disclosure, the tension and compression force loader 2 is used for applying tension or compression force to the sample 7 to be measured placed inside. The tension and pressure loading instrument 2 is internally provided with a tension unit and a pressure unit, fig. 1 is a structural diagram of a device for applying tension to a sample to be measured in a magnetic property measuring device of a magnetic material under stress according to an embodiment of the present application, and fig. 2 is a structural diagram of a device for applying pressure to a sample to be measured in a magnetic property measuring device of a magnetic material under stress according to an embodiment of the present application, mainly note that fig. 1 only shows the tension unit, fig. 2 only shows the tension unit, and is not limited to the tension and pressure loading instrument 2, and the tension and pressure loading instrument 2 in the present embodiment includes both the tension unit and the pressure unit.
It should be noted that the tension unit and the pressure unit can only act independently and cannot work together, that is, the tension and pressure loading instrument 2 can only use one of the tension unit and the pressure unit at the same time.
Specifically, the tension and pressure loading instrument 2 includes a loading instrument housing 201, and a first fixing plate 202, a second fixing plate 203, a first hydraulic cylinder, and a second hydraulic cylinder (the first hydraulic cylinder and the second hydraulic cylinder are not shown in the figure) are arranged inside the loading instrument housing 201; the first hydraulic cylinder is arranged in the loader shell 201, a piston rod of the first hydraulic cylinder is connected with the first fixing plate 202, and the piston rod of the first hydraulic cylinder does telescopic motion so as to drive the first fixing plate 202 to move up and down in the loader shell 201; the second hydraulic cylinder is installed in loader casing 201, and the piston rod of second hydraulic cylinder links to each other with second fixed plate 203, thereby the piston rod of second hydraulic cylinder is telescopic motion enough to follow and drive first fixed plate 202 and reciprocate in loader casing 201.
It should be noted that, fig. 1 only shows the first fixing plate 202 and the first hydraulic cylinder for cooperating with the tension unit, and fig. 2 only shows the second fixing plate 203 and the second hydraulic cylinder for cooperating with the pressure unit, and fig. 1 and 2 are not limitations of the present application.
As shown in fig. 1, the tension unit includes a tension caliper set, a high-precision tension sensor and a tension and pressure loading system (the high-precision tension sensor and the tension and pressure loading system are not shown in the figure); the device comprises two tension calipers 3 which are correspondingly arranged up and down in a tension caliper group, each tension caliper 3 is used for clamping a sub-tension test fixture 401, the top of one tension caliper 3 which is positioned above in the tension caliper group is fixed at the top of a loader shell 201, one tension caliper 3 which is positioned below in the tension caliper group is installed on a first fixing plate 202, a first hydraulic cylinder piston rod is in telescopic motion so as to drive the first fixing plate 202 to move, and then the corresponding tension caliper 3 is driven to move away from or close to the other tension caliper 3, when the first hydraulic cylinder piston rod drives the first fixing plate 202 and the tension caliper 3 which is installed on the first fixing plate 202 to move away from the other tension caliper 3, tension is applied to the tension test fixtures 4 clamped by the two tension calipers 3; the tension loading system comprises a controller, wherein the controller controls a first hydraulic cylinder piston rod to move, the first hydraulic cylinder piston rod is controlled by the controller to drive the first fixing plate 202 to move through the first hydraulic cylinder piston rod, then the corresponding tension calipers 3 are driven to move to apply tension to the tension test clamp 4 which is used for clamping the two tension calipers 3, and the tension is applied to the tested sample piece 7 fixed with the tension test clamp 4. Namely, each tension caliper 7 fixes a sub-tension test fixture 401, and the tension caliper 7 positioned below in the tension caliper group moves away from the other tension caliper 7 under the action of the first hydraulic cylinder so as to provide tension for the tested sample 7 wound with the coil group. The high-precision tension sensor is connected with the tension caliper 3 and the tension and pressure loading system, and is used for measuring the tension value of the sample 7 to be measured at the moment, and the tension and pressure loading instrument 2, the tension caliper 3, the high-precision tension sensor, the tension and pressure loading system, the controller and the like are the prior art and are described in detail herein.
As shown in fig. 2, the pressure unit includes two pressure plates 6, a high-precision pressure sensor and a pull-pressure loading system (the high-precision pressure sensor and the pull-pressure loading system are not shown in the figure) which are arranged up and down correspondingly; the sample under test 7 and the pressure test jig 5 fixed together are positioned between the two platens 6, that is, the sample under test 7 and the pressure test jig 5 fixed together are placed on the lower one of the two platens 6, and the upper one of the two platens 6 is moved close to the other platen 6 to apply pressure to the sample under test 7 on which the coil assembly is wound. The pressure plate 6, the high-precision pressure sensor, the tension and pressure loading system, the controller and the like in the tension and pressure loading instrument 2 are prior art, and are described herein in detail.
Specifically, each pressure plate 6 is fixedly provided with a pressure plate mounting rod 601, one pressure plate 6 located above is mounted on the second fixing plate 203 through the pressure plate mounting rod 601, the second fixing plate 203 is connected with a piston rod of a second hydraulic cylinder, the piston rod of the second hydraulic cylinder does telescopic motion so as to drive the second fixing plate 203 to move up and down in the loader shell 201, so that the pressure plate 6 mounted on the second fixing plate 203 moves close to or away from the other pressure plate 6, and one pressure plate 6 located below is fixedly mounted at the bottom of the loader shell 201 through the pressure plate mounting rod 601; the controller of pulling force loading system control second pneumatic cylinder piston rod moves to drive second mounting panel 203 and install the pressure disk 6 motion on second mounting panel 203 through second pneumatic cylinder piston rod, when installing pressure disk 6 on second mounting panel 203 and do the motion of being close to another pressure disk 6, pulling force loading system exerts pressure to pressure test fixture 5 between two pressure disks 6, and then has the tested sample 7 of coil assembly to the winding fixed with pressure test fixture 5 and exert pressure. And the high-precision pressure sensor is connected with the pressure plate 6 and the tension pressure loading system and is used for measuring the pressure value of the sample 7 to be measured at the moment.
In the embodiment of the present disclosure, the tensile test fixture 4 and the compressive test fixture 5 are made of polyetheretherketone, which is a non-magnetic material with easy processing and high mechanical strength.
The magnetic property tester 1 includes: a signal generator, a power amplifier, a power analyzer, etc., and in other embodiments of the present invention, the magnetic characteristic tester 1 includes, but is not limited to including, a signal generator, a power amplifier, a power analyzer, etc.
The power analyzer is connected with the induction winding coil through a test wire and is used for detecting the induction voltage of the tested sample 7;
the signal generator is connected with the power amplifier and is connected with the exciting winding coil through a test wire and used for applying alternating exciting current to the exciting winding coil, the relation between the alternating exciting current and magnetic flux density of magnetic field strength under different magnetic field strengths is obtained by adjusting the exciting current during testing, and the tested sample piece 7 subjected to stress action in the tension and pressure loader 2 is directly measured and tested through the magnetic characteristic tester 1 to obtain the direct current and alternating current magnetic characteristics of the tested sample piece 7 under the stress action.
Specifically, after the tested sample 7 and the corresponding tension test fixture 4 or pressure test fixture 5 are installed, the fixture is placed in the tension and pressure loading instrument 2; when the tensile force is tested to act, the tensile caliper 3 clamps the sample tensile force test fixture 4, a tensile force with a certain value is applied, and the magnetic property of the sample under the tensile force is tested by the magnetic property tester 1; when the pressure testing force acts, the pressure testing clamp 5 of the tested sample 7 is placed between the pressure plates 6, pressure with a certain numerical value is applied to the tested sample 7 through the tension pressure loader 2, the magnetic characteristic of the sample under the pressure action is tested through the magnetic characteristic tester 1, the magnetic characteristic under different stress actions is recorded, and the corresponding rule between the testing characteristic and the stress of the magnetic material is obtained.
It should be noted that the sample 7 is demagnetized before the test.
The calculation formula of the stress sigma borne by the measured sample is as follows:
in the formula: f is the force applied to the sample to be measured; a is the cross-sectional area of the stressed part of the tested sample, the compressive stress corresponds to the radial surface area of the sample, and the tensile stress corresponds to the axial cross-sectional area.
The magnetic properties of the sample 7 to be measured are calculated as follows:
the direct-current magnetic field induced magnetic flux density B is calculated as follows:
the ac magnetic field induced magnetic flux density B is calculated as follows:
in the formula: a is the cross-sectional area of the annular measured sample; d is the outer diameter of the annular measured sample; d is the inner diameter of the annular measured sample; h is the height of the annular measured sample; h is the field strength of the excitation magnetic field; n is a radical of1Is the number of turns of the excitation winding; i is the excitation current; l is the average magnetic path length of the sample piece, N2Is the number of induction winding turns, v is the induction voltage, f the alternating current magnetic field frequency.
Because a clamp and an air gap exist between the coil group and the tested sample, the test result may be influenced, and the calculation formula of the corrected induced magnetic flux density B' is as follows:
in the formula: b' is the corrected induced magnetic flux density, μ0Is the magnetic constant, A1Is the total cross-sectional area of the induction winding.
In summary, the present application provides a device for measuring magnetic properties of a magnetic material under stress, including: a coil group, a clamp group and a magnetic characteristic tester 1; the coil group is wound outside the annular tested sample 7 and is used for being connected with the magnetic characteristic tester 1 through a test wire; the magnetic characteristic tester 1 is used for providing exciting current for the coil assembly, detecting induced voltage of the tested sample and testing the magnetic characteristic of the tested sample 7 under the action of stress in real time; the clamp group is used for being matched with the tested sample 7, stress is conveniently applied to the tested sample, and therefore stress of the coil group on the tested sample 7 is avoided, and force can be uniformly applied to the sample. The technical scheme of the invention is convenient to obtain the magnetic properties of the magnetic material such as relative permeability under the action of different stresses, and the like, and obtains the corresponding rule through a plurality of tests, thereby playing an important guiding significance for the design and the construction process of the magnetic shielding device.
Example 2
Fig. 7 is a flowchart of a method for measuring magnetic properties of a magnetic material under stress according to an embodiment of the present application, where the method includes:
step 1: designing a tensile test clamp 4 and a pressure test clamp 5 with corresponding sizes according to the size of a sample 7 to be tested;
and 2, step: according to the test requirements, winding is carried out on the tested sample 7 and the clamp, and the excitation coil and the induction coil are respectively connected with the magnetic property tester 1;
and step 3: mounting the manufactured tested sample 7 and the clamp on the corresponding tension caliper 3 or pressure plate 6, and applying tension pressure in the test requirement;
and 4, step 4: after the tension pressure value is stable, the tested sample 7 is demagnetized, and after the demagnetization is finished, the AC/DC magnetic characteristic of the tested sample 7 is tested by the magnetic characteristic tester 1;
and 5: and recording the magnetic characteristics under the action of different stresses to obtain a corresponding rule between the measured characteristics of the magnetic material and the stresses.
Fig. 8 is a specific flowchart of a method for measuring magnetic properties of a magnetic material under stress according to an embodiment of the present application, and as shown in fig. 8, the method specifically includes:
s1: preparing annular tested samples 7 made of materials such as permalloy, amorphous/nanocrystalline and the like;
s2: winding the tested sample 7 according to the requirement of the number of turns, and fixing the tested sample 7 and the tension test fixture 4 or the tension test fixture 5 in a matching way;
wherein, the excitation winding coil and the induction winding coil are wound on the whole circumference of the corresponding tested sample as closely as possible.
S3: installing a tested sample 7 and a tension test clamp 4 or a tension test clamp 5 fixed with the tested sample 7 in a tension and pressure loader 2;
specifically, after the tested sample 7 and the corresponding tension test fixture 4 or pressure test fixture 5 are installed, the fixtures are placed in a tension and pressure loader 2, and when a test tension acts, each tension caliper 7 fixes one sub-tension test fixture 401; when testing pressure effect and acting on, will be surveyed sample 7 and pressure test anchor clamps 5 and place two pressure disks 6 in the middle of, be about to be located on the pressure disk 6 of drawing pressure loading appearance 2 below by sample 7 and pressure test anchor clamps 5.
S4: connecting an excitation winding coil and an induction winding coil wound on a tested sample 7 with a magnetic characteristic tester 1;
wherein the magnetic property tester 2 includes: the power analyzer is connected with the induction winding coil through a test wire and is used for detecting the induction voltage of the tested sample 7; the signal generator is connected with the power amplifier and is connected with the exciting winding coil through a test wire and used for applying alternating exciting current to the exciting winding coil, the relation between the alternating exciting current and magnetic flux density of magnetic field strength under different magnetic field strengths is obtained by adjusting the exciting current during testing, and the tested sample piece 7 subjected to stress action in the tension and pressure loader 2 is directly measured and tested through the magnetic characteristic tester 1 to obtain the direct current and alternating current magnetic characteristics of the tested sample piece 7 under the stress action.
S5: starting the tension and pressure loading instrument 2 to apply tension or pressure to the sample 7 to be measured;
specifically, when the tensile force is tested to act, each tensile force caliper 7 fixes one sub-tensile force test fixture 401, and then the pressure loading instrument 2 is pulled to apply a tensile force with a certain numerical value, and the tensile force calipers 7 installed on the first fixing plate 202 in the tensile force caliper group move away from the other tensile force caliper 7 under the action of the first hydraulic cylinder so as to provide tensile force for the tested sample 7 wound with the coil group; when testing pressure effect and acting on, draw pressure loader 2 to add the pressure of certain numerical value, the second hydraulic cylinder piston rod is done and is driven the second hydraulic cylinder and drive second fixed plate 203 and install pressure disk 6 on second fixed plate 203 and carry out the motion that is close to another pressure disk 6 to exert pulling force to pressure test fixture 5 between two pressure disks 6, and then have the tested appearance piece 7 of coil assembly to the winding fixed with pressure test fixture 5 and exert pressure.
S6: demagnetizing the tested sample 7;
s7: starting the magnetic characteristic tester 1, clamping the sample piece tension test clamp 4 by the tension caliper 3 when the tension is tested to act, and testing the magnetic characteristic of the sample piece under the action of the tension by the magnetic characteristic tester 1; when the pressure testing force is used, the pressure testing clamp 5 of the tested sample 7 is placed in the middle of the pressure plate 6, pressure with a certain value is applied, the magnetic characteristic of the sample under the pressure action is tested through the magnetic characteristic tester 1, the magnetic characteristics under different stress actions are recorded, and the corresponding rule between the testing characteristic and the stress of the magnetic material is obtained. The magnetic characteristic tester 1 adopts an analog impact method to test parameters such as a magnetic hysteresis loop, a magnetization curve, magnetic permeability and the like of a tested sample 7 under a direct-current magnetic field, and adopts a voltammetry method and a digital integration method to measure parameters such as a dynamic magnetic hysteresis loop, amplitude magnetic permeability and the like under 0.01Hz-1 KHz.
In summary, the present application provides a device and a method for measuring magnetic properties of a magnetic material under stress, which can test the magnetic properties of a sample under a constant value stress in real time, and the accuracy of the measurement result is high; the invention discloses a device and a method for measuring the magnetic property of a magnetic material under the action of stress, and provides a special clamp. The clamp is simple to manufacture and convenient to use; the device and the method for measuring the magnetic property of the magnetic material under the stress can measure the alternating current-direct current magnetic property of permalloy and other magnetic shielding materials under the stress, and provide important guidance for the construction of various magnetic shielding cabins, particularly large spliced magnetic shielding cabins.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A device for measuring the magnetic properties of a magnetic material under stress, the device comprising: the device comprises a coil group, a clamp group and a magnetic property tester;
the coil group is wound outside the annular tested sample and is used for being connected with the magnetic characteristic tester through a test wire;
the magnetic characteristic tester is used for providing exciting current for the coil assembly, detecting induced voltage of the tested sample and testing the direct current or alternating current magnetic characteristic of the tested sample under the action of stress in real time;
the clamp group is used for being matched with a tested sample piece, stress is conveniently applied to the tested sample piece, and therefore the stress of the coil group on the tested sample piece is avoided, and the force can be uniformly applied to the tested sample piece.
2. The apparatus of claim 1, wherein the set of clamps comprises a tensile test clamp and a compressive test clamp;
the tensile test fixture is arranged in the annular tested sample and used for being matched with the tested sample to conveniently provide tensile force for the tested sample, and the pressure test fixture is used for being matched with the tested sample to conveniently provide tensile force for the tested sample.
3. The device according to claim 2, wherein the tensile test fixture comprises two sub tensile test fixtures, and the two sub tensile test fixtures are oppositely arranged in the annular tested sample in the direction of the outer surfaces deviating from each other;
the outer surface of each sub-tensile force test fixture is provided with a smooth part, and the smooth part is an installation position of a tested sample;
the first mounting grooves of a plurality of first mounting grooves and both sides are arranged on both sides of the smooth portion in a one-to-one correspondence mode, and the first mounting grooves are used for mounting coils wound on a tested sample piece, so that the tensile test fixture is fixed with the tested sample piece.
4. The device of claim 3, wherein the first mounting grooves are uniformly arranged on both sides of the smooth part arranged on the outer surface of the sub tensile testing jig, and the number of the first mounting grooves is set according to the number of turns of the coil wound on the sample piece to be tested.
5. The device according to claim 2, wherein the pressure test fixture comprises two sub-pressure test fixtures, and a plurality of second mounting grooves for the coil to pass through are formed in one surface of each sub-pressure test fixture in a circle, and the spacing angles of the second mounting grooves ensure that the coil is uniformly wound on the whole circumference of the sample to be tested;
the second mounting groove is arranged according to the number of turns of the coil wound on the sample piece to be tested, the two sub-pressure test fixtures are oppositely arranged in a mode that one surface provided with the second mounting groove is deviated, the sample piece to be tested is correspondingly arranged between the two sub-pressure test fixtures,
and the coil group is wound on the tested sample piece and the sub-pressure test fixture, and the tested sample piece and the pressure test fixture are fixed together under the matching action of the coil group and the second mounting groove.
6. The device of claim 1, further comprising a tension and pressure loading instrument, wherein a tension unit and a pressure unit are arranged in the tension and pressure loading instrument;
the tension unit comprises two tension calipers which are correspondingly arranged up and down, each tension caliper fixes one sub-tension test fixture, and at least one tension caliper moves away from the other tension caliper so as to provide tension for a tested sample wound with a coil group;
the pressure unit comprises two pressure plates which are oppositely arranged, a tested sample piece and a pressure testing clamp which are fixed together are positioned between the two pressure plates, and at least one pressure plate moves close to the other pressure plate so as to provide pressure for the tested sample piece wound with the coil group.
7. The device of claim 2, wherein the tensile test fixture and the compressive test fixture are made of polyetheretherketone, a non-magnetic material that is easy to machine and has high mechanical strength.
8. The apparatus of claim 1, wherein the coil assembly comprises: the device comprises an excitation winding coil and an induction winding coil, wherein the excitation winding coil and the induction winding coil are wound on the whole circumference of a sample to be measured.
9. The apparatus of claim 1, wherein the magnetic property tester comprises: the device comprises a signal generator, a power amplifier and a power analyzer;
the power analyzer is connected with the induction winding coil through a test wire and is used for detecting the induction voltage of the tested sample;
the signal generator is connected with the power amplifier and is connected with the exciting winding coil through a test wire, and the signal generator is used for applying a direct current and alternating current exciting magnetic field to the exciting winding coil and testing the direct current and alternating current magnetic characteristics of the tested sample under the action of stress.
10. The method for measuring the magnetic property of the magnetic material under stress according to any one of the preceding claims 1 to 9, wherein the method comprises:
designing a tensile test clamp and a pressure test clamp with corresponding sizes according to the size of a sample to be tested;
according to the test requirements, winding is carried out on the tested sample and the clamp, and the excitation coil and the induction coil are respectively connected with a magnetic property tester;
mounting the manufactured tested sample piece and the clamp on corresponding tension calipers or pressure plates, and applying tension pressure in the test requirement;
after the tension pressure value is stable, the sample piece is demagnetized, and after the demagnetization is finished, the AC/DC magnetic characteristic of the sample piece to be tested is tested by a magnetic characteristic tester;
and recording the magnetic characteristics under the action of different stresses to obtain a corresponding rule between the measured characteristics of the magnetic material and the stresses.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117054939A (en) * | 2023-06-29 | 2023-11-14 | 中南大学 | Device and method for measuring force-magnetic characteristics of magnetic material in real time |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117054939A (en) * | 2023-06-29 | 2023-11-14 | 中南大学 | Device and method for measuring force-magnetic characteristics of magnetic material in real time |
| CN117054939B (en) * | 2023-06-29 | 2024-03-29 | 中南大学 | Device and method for measuring force-magnetic characteristics of magnetic material in real time |
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