CN104122516A - Electrical sheet steel magnetostriction measurement system and method - Google Patents
Electrical sheet steel magnetostriction measurement system and method Download PDFInfo
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- CN104122516A CN104122516A CN201410354315.6A CN201410354315A CN104122516A CN 104122516 A CN104122516 A CN 104122516A CN 201410354315 A CN201410354315 A CN 201410354315A CN 104122516 A CN104122516 A CN 104122516A
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Abstract
The invention relates to an electrical sheet steel magnetostriction measurement system and method. A computer controls an arbitrary waveform generator to produce waveforms, the arbitrary waveform generator is controlled to change the waveforms according to data uploaded by a multi-channel data acquisition unit, an iterative algorithm is utilized to obtain expected waveforms of magnetic polarization intensity induced voltage, and a magnetostriction loop line of a measured sample is further calculated. A power amplifier performs amplification processing on a received signal, and an excitation device fixes the measured sample to enable the measured sample to work in the closed magnetic circuit condition and exerts stress in the magnetization direction. A laser vibration measurement instrument is used for measuring the vibration speed. The multi-channel data acquisition unit is used for acquiring voltage, current and the vibration speed. The electrical sheet steel magnetostriction measurement system and method achieves measurement of the electrical sheet steel magnetostriction loop line under the conditions of the closed magnetic circuit and the stress, meets a general using environment of an electrical sheet steel, utilizes the iteration method to enable the magnetic polarization intensity induced voltage waveforms to be sine waves, replaces a traditional analog feedback loop and has the advantages of being not prone to oscillation, wide in frequency range and the like.
Description
Technical field
The present invention relates to magnetic material magnetic energy fields of measurement, relate in particular to a kind of electrical sheet magnetostriction measurement system and method.
Background technology
Electrical sheet is the magnetically soft alloy of function admirable, comprises siliconized plate, permalloy, amorphous and the material such as nanocrystalline, is indispensable important magnetic material in various motors and transformer.The magnetostriction of electrical sheet refers under action of alternating magnetic field, the phenomenon that its volume changes with alternating magnetic field.It not only brings pollution from environmental noise, also can cause heating unshakable in one's determination, even produces resonance, causes electrical equipment fault.The magnetostriction coefficient of electrical sheet has become the important performance indexes of transformer, motor, and China is electrical sheet the first big producing country, and people more and more pay close attention to the Magnetostriction of electrical sheet.Therefore, adopt the magnetostriction loop line of system and method Measurement accuracy electrical sheet effectively reliably to seem particularly important.
At present, have in the world electrical sheet magnetostrictive measuring instrument commercialization instrument, the MST-400C magnetostriction testing meter that for example reason of Japan is ground, its adopts solenoid excitation, sample is not having free vibration under stress, utilizes laser displacement gauge to measure magnetostriction.But solenoid excitation is open-flux path working method, and the iron core that electrical sheet forms is operated under closed magnetic circuit condition mostly, and solenoid excitation mode has certain limitation.In addition, the production of electrical sheet and use producer are more concerned about Magnetostriction under stress condition, and above-mentioned measuring equipment does not have this function.
Another generally adopts in the world the SST single sheet measurement method of IEC60404-3 standard regulation to form closed-loop path and measures electrical sheet magnetic property.Its excitation unit is monolithic permeameter, has adopted two vertical yoke and a measurement wire frame.Although the monolithic permeameter measuring principle of IEC60404-3 standard regulation can be applicable in the magnetostrictive measuring instrument of electrical sheet, its magnetic yoke structure and slotted line mount structure are all not suitable for magnetostriction measurement under stress condition.
Summary of the invention
Technical matters to be solved by this invention is for the deficiencies in the prior art, a kind of electrical sheet magnetostriction measurement system and method is provided, solve magnetostriction measurement problem, improve China's electrical sheet amount and pass and quality inspection ability, meet the demand of the analysis to measure means of the advanced manufacturing industry urgent need of high-rating generator and transformer for the new material technology field such as high-performance electrician steel, national great power engineering.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of electrical sheet magnetostriction measurement system, comprises computing machine, AWG (Arbitrary Waveform Generator), power amplifier, excitation unit, laser vibration measurer and Multichannel data acquisition device;
Described computing machine, it produces expectation waveform for controlling AWG (Arbitrary Waveform Generator), and also the data analysis for Multichannel data acquisition device is uploaded, controls AWG (Arbitrary Waveform Generator) and change waveform, utilize iterative algorithm to obtain expectation waveform, and then calculate sample magnetostriction loop line;
Described AWG (Arbitrary Waveform Generator), it for producing random waveform and sending to power amplifier, also for Multichannel data acquisition device provides synchronous sampling signal under computer control;
Described power amplifier, it amplifies processing for the waveform that AWG (Arbitrary Waveform Generator) is sent, and then sends to excitation unit;
Described excitation unit, it,, for fixing sample, is operated under closed magnetic circuit condition sample, is sample excitation, simultaneously stress application in direction of magnetization;
Described laser vibration measurer, it vibrates speed for measuring the magnetostriction of excitation unit, and the vibration velocity of measurement is sent to Multichannel data acquisition device;
Described Multichannel data acquisition device, the vibration velocity that it sends for receiving laser vibration measurer, also for gathering the electric current and voltage data of excitation unit and processing, sends to computing machine by the data after processing.
The invention has the beneficial effects as follows: the fixing sample of excitation unit in the present invention, sample is operated under closed magnetic circuit condition, stress application in direction of magnetization, can be to sample excitation under magnetic polarization induced voltage sine condition, measure magnetostriction loop line, the measurement that excitation unit is sample provides suitable measurement environment, meets the general environment for use of electrical sheet; Adopt laser vibration measurer to measure magnetostriction vibration, the vibration velocity that records is processed to the displacement that is converted into sample through Multichannel data acquisition device sampling and computer data, and laser vibration measurer has the features such as high, the reproducible and magnitude tracing of accuracy of measurement facilitates; Described computing machine carries out digital frequency analysis to the data that gather, control AWG (Arbitrary Waveform Generator) and change waveform, utilize process of iteration to make magnetic polarization induction voltage waveform for sine wave, replace traditional analog feedback loop, there is the features such as little, the difficult concussion of waveform distortion and wide frequency range.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described excitation unit comprises that level " returns " shape yoke, measures wire frame, pressue device and pressure guide piece; Described level " is returned " laterally fixation measuring wire frame of shape yoke middle part, described pressure guide piece is hollow, rectangular structure, sample is fixed in pressure guide piece, and described pressure guide piece level is through measuring wire frame, and two ends ride over level and " return " in shape yoke.
Adopt the beneficial effect of above-mentioned further scheme to be: level of the present invention " is returned " shape yoke and provided closed magnetic circuit for sample, compare with traditional vertical yoke, the advantage such as have handling ease, not easy to crack, insulation resistance is high and end face is smooth is applicable to the magnetostriction measurement of electrical sheet very much; Described pressure guide piece plays pressure guide effect, makes sample free vibration in the longitudinal direction under compressive stress, does not produce in vertical direction distortion.
Further, described level " is returned " shape yoke and is adopted silicon steel laminations to form " returning " word shape, and its outer ring square length of side is 500mm, and the inner ring square length of side is 300mm, and lamination thickness is 25mm.
Further, described measurement wire frame comprises that described measurement wire frame comprises skeleton, armature winding, secondary winding, a H coil and the 2nd H coil; Described skeleton is rectangular hollow platy structure, its inner rectangular enclosure that forms, the one H coil and the 2nd H coil are installed respectively in the upper and lower both sides of skeleton, and take skeleton, a H coil and the 2nd H coil is axle coiling secondary winding, and then at the outside of secondary winding coiling armature winding.
Adopt the beneficial effect of above-mentioned further scheme to be: to measure wire frame and adopt upper and lower two H coils, H coil voltage and secondary induction voltage are input in Multichannel data acquisition device, by the analog subtracter in Multichannel data acquisition device, make secondary induction voltage deduct the coil-induced voltage of H, thereby obtain magnetic polarization induced voltage; Above-mentioned measurement wire frame has manufacture craft simply and debugs the advantages such as convenient.
Further, described skeleton internal cavities height is 5mm, and width is 106mm.
Adopt the beneficial effect of above-mentioned further scheme to be: to measure wire frame and adopt above-mentioned width, be conducive to coordinate with sample; Measure wire frame open height large, be convenient to the installation of pressue device.
Further, described pressure guide piece comprises upper mounted plate and bottom plate, sample is placed on bottom plate, upper mounted plate and sample keep certain interval, fixed plate is provided with reflective mirror mounting hole and fixture mounting hole, the reflective mirror that described reflective mirror mounting hole is used for laser vibration measurer is installed, described fixture mounting hole sectional fixture, for clamping one end of sample, the other end of sample connects pressue device.
Adopt the beneficial effect of above-mentioned further scheme: pressure guide effect is played in upper mounted plate and bottom plate cooperation, makes sample free vibration in the longitudinal direction under compressive stress, does not produce in vertical direction distortion.
Further, described bottom plate is smooth plates, and the gap between fixed plate and sample is 0.1mm, and fixed thickness of slab is 3mm, and bottom plate is thick is 0.1 to 1mm.
Adopt the beneficial effect of above-mentioned further scheme: bottom plate adopts smooth plates, to reduce the friction of sample and bottom plate, upper mounted plate prevent sample pressurize after perk in the vertical direction, bottom plate prevents that the sample and the yoke that are magnetized from holding.
Further, the electric current and voltage data of described Multichannel data acquisition device collection comprise elementary exciting current, the coil-induced voltage of H and secondary induction voltage, described Multichannel data acquisition device inside comprises analog subtracter, utilize analog subtracter to make secondary induction voltage deduct the coil-induced voltage of H, thereby obtain magnetic polarization induced voltage.
Adopt the beneficial effect of above-mentioned further scheme: the analog subtracter by Multichannel data acquisition device inside makes secondary induction voltage deduct the coil-induced voltage of H, thereby obtains the induced signal of magnetic polarization, realize air-gap flux compensation.
Another technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of electrical sheet magnetostriction measurement method, comprises the steps:
Step 1, computer control AWG (Arbitrary Waveform Generator) produces expectation waveform;
Step 2, expectation waveform is after power amplifier amplifies, to the sample excitation in excitation unit;
Step 3, laser vibration measurer is measured the magnetostriction vibration speed of excitation unit, and the vibration velocity of measurement is sent to Multichannel data acquisition device;
Step 4, Multichannel data acquisition device receives the magnetostriction vibration speed that laser vibration measurer sends, gather the coil-induced voltage of elementary exciting current, H and secondary induction voltage in excitation unit simultaneously, utilize its inner analog subtracter to make secondary induction voltage deduct the coil-induced voltage of H, obtain magnetic polarization induced voltage, and then send to computing machine;
Step 5, computing machine carries out digital frequency analysis to magnetic polarization induced voltage, controls AWG (Arbitrary Waveform Generator) and changes waveform, utilizes process of iteration to make magnetic polarization induction voltage waveform for expectation waveform;
Step 6, vibrates the magnetostriction loop line of speed, elementary exciting current and magnetic polarization calculation of lightning induced voltage sample at magnetic polarization induction voltage waveform for expecting under waveform strip part, utilize the magnetostriction now obtaining.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the specific implementation of calculating the magnetostriction loop line of sample in step 6 is: by magnetostriction vibration speed and magnetic polarization induced voltage numerical integration in one-period, thereby obtain magnetostrictive displacement waveform and magnetic polarization waveform; From waveform, obtain the loop line that magnetostriction changes with magnetic polarization; Calculate the product of one-period internal magnetic pole intensity induced voltage and elementary exciting current, thereby calculate sample loss.
Accompanying drawing explanation
Fig. 1 is a kind of electrical sheet magnetostriction measurement system chart of the present invention;
Fig. 2 a is excitation unit structural representation of the present invention;
Fig. 2 b is the perspective view that level of the present invention " is returned " shape yoke and measuring coil;
Fig. 3 a is that the master of measurement wire frame of the present invention looks cut-open view;
Fig. 3 b is the cut-open view along the AA ' direction of Fig. 3 a;
Fig. 4 a is the vertical view of pressure apparatus of the present invention and pressure guide piece;
Fig. 4 b is the cut-open view along the BB ' direction of Fig. 4 a;
Fig. 5 is a kind of electrical sheet magnetostriction measurement method flow diagram of the present invention.
In accompanying drawing, the list of parts of each label representative is as follows:
101, computing machine, 102, AWG (Arbitrary Waveform Generator), 103, power amplifier, 104, excitation unit, 105, laser vibration measurer, 106, Multichannel data acquisition device, 201, level " is returned " shape yoke, 202, measure wire frame, 203, pressue device, 204, pressure guide piece, 205, reflective mirror, 206, fixture, 301, skeleton, 302, armature winding, 303, secondary winding, 304, the one H coil, 305 the 2nd H coils, 401, upper mounted plate, 402, bottom plate, 403, reflective mirror mounting hole, 404, fixture mounting hole, 405, sample.
Embodiment
Below in conjunction with accompanying drawing, principle of the present invention and feature are described, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1, a kind of electrical sheet magnetostriction measurement system, comprises computing machine 101, AWG (Arbitrary Waveform Generator) 102, power amplifier 103, excitation unit 104, laser vibration measurer 105 and Multichannel data acquisition device 106; Described computing machine 101, it produces expectation waveform for controlling AWG (Arbitrary Waveform Generator), and also the data analysis for Multichannel data acquisition device is uploaded, controls AWG (Arbitrary Waveform Generator) and change waveform, utilize iterative algorithm to obtain expectation waveform, and then calculate sample magnetostriction loop line; Described AWG (Arbitrary Waveform Generator) 102, it for producing random waveform and sending to power amplifier, also for Multichannel data acquisition device provides synchronous sampling signal under computer control; Described power method device 103, it amplifies processing for the waveform that AWG (Arbitrary Waveform Generator) is sent, and then sends to excitation unit; Described excitation unit 104, it,, for fixing sample, is operated under closed magnetic circuit condition sample, is sample excitation, simultaneously stress application in direction of magnetization; Described laser vibration measurer 105, it vibrates speed for measuring the magnetostriction of excitation unit, and the vibration velocity of measurement is sent to Multichannel data acquisition device; Described Multichannel data acquisition device 106, the vibration velocity that it sends for receiving laser vibration measurer, also, for gathering the coil-induced voltage of elementary exciting current, H and the secondary induction voltage of excitation unit, sends to computing machine by the data of collection.
As shown in Fig. 2 a, 2b, described excitation unit comprises that level " returns " shape yoke 201, measures wire frame 202, pressue device 203 and pressure guide piece 204; Described level " is returned " the shape yoke 201 horizontal fixation measuring wire frames 202 in middle part, described pressure guide piece 204 is hollow, rectangular structure, sample is fixed in pressure guide piece 204, described pressure guide piece 204 levels are through measuring wire frame 202, two ends ride over level and " return " in shape yoke 201, and its one end connects pressue device 203.Level of the present invention " is returned " shape yoke 201, compares with traditional vertical yoke, and the advantage such as have handling ease, not easy to crack, insulation resistance is high and end face is smooth is applicable to the magnetostriction measurement of electrical sheet very much; Described pressure guide piece 204, makes sample free vibration in the longitudinal direction under compressive stress, does not produce in vertical direction distortion.
Traditional monolithic permeameter all adopts vertical yoke, and in the present invention, horizontal yoke is compared the advantage such as have handling ease, not easy to crack, insulation resistance is high and end face is smooth with traditional vertical yoke, is applicable to very much the magnetostriction measurement of electrical sheet.Horizontal yoke is used high-quality orientation silicon steel lamination to form " returning " word shape, and the outer ring square length of side is 500mm, and the inner ring square length of side is 300mm, and lamination thickness is 25mm.Horizontal yoke provides closed magnetic circuit for sample.
Wherein, described level " is returned " shape yoke and is adopted silicon steel laminations to form " returning " word shape, and its outer ring square length of side is 500mm, and the inner ring square length of side is 300mm, and lamination thickness is 25mm.
As shown in Fig. 3 a, 3b, described measurement wire frame comprises skeleton 301, armature winding 302, secondary winding 303, a H coil 304 and the 2nd H coil 305; Described skeleton is rectangular hollow platy structure, its inner rectangular enclosure that forms, at skeleton, Shang Xia 301, both sides are installed respectively by the one H coil 304 and the 2nd H coil 305, take skeleton 301, a H coil 304 and the 2nd H coil 305 as axle coiling secondary winding 304, and then at the outside of secondary winding coiling armature winding 302.Described measurement wire frame 202 adopts upper and lower two H coils, the coil-induced voltage of elementary exciting current, H and the secondary induction voltage that gather are input in Multichannel data acquisition device 106, by analog subtracter, make secondary winding voltage deduct the coil-induced voltage of H, thereby obtain the induced signal of magnetic polarization; Above-mentioned measurement wire frame has strong interference immunity, manufacture craft is simple and debug the advantages such as convenient.
Described skeleton 301 internal cavities height are 5mm, and width is 106mm, and the change of width is in order to be applicable to sample, because tested sample width is 100mm; Tradition permeameter height is generally the smaller the better, is generally less than 2mm, is convenient to air-gap flux compensation, and measurement wire frame open height of the present invention is large, is the use for the ease of pressue device.Owing to measuring, wire frame open height is large, traditional air-gap flux compensatory approach is no longer applicable, the present invention adopts upper and lower two H coils, be input in Multichannel data acquisition device, analog subtracter by Multichannel data acquisition device inside makes secondary induction voltage deduct the coil-induced voltage of H, thereby obtain the induced signal of magnetic polarization, realize air-gap flux compensation.The method is compared with conventional one-piece permeameter mutual inductance penalty method, has manufacture craft simply and debugs the advantages such as convenient.
As shown in Fig. 4 a, 4b, described pressure guide piece 204 comprises upper mounted plate 401 and bottom plate 402, sample is placed on bottom plate 402, upper mounted plate 401 keeps certain interval with sample, fixed plate 401 is provided with reflective mirror mounting hole 403 and fixture mounting hole 404, the reflective mirror that described reflective mirror mounting hole 403 is used for laser vibration measurer is installed, described fixture mounting hole 404 sectional fixtures, for clamping one end of sample, the other end of sample connects pressue device.
For pressue device of the present invention, source pressure is controlled in classical Pneumatic pressure, and the present invention is not repeating at this.The thickness of electrical sheet is generally being less than 0.5mm, and sample length is 500mm, and wide is 100mm, and the present invention applies tension and the compressive stress of 0-10MPa in the longitudinal direction.Tension implements easily, but the realization of compressive stress is key problem in technology.The present invention designs and has realized pressure guide housing 204, and wherein the upper mounted plate 401 of pressure guide piece is thick is 3mm, and bottom plate is thick is 0.1-1mm, and sample is placed on bottom plate 402, and upper mounted plate 401 is controlled at 0.1mm left and right with sample interval.Bottom plate 402 must be smooth flat board, and its integral body is placed on two ends yoke, measures on wire frame inside casing and the formed horizontal plane of fixture.On upper mounted plate, have two perforates, one is reflective mirror mounting hole 403, the reflective mirror using for laser vibration measurer is installed; Another perforate is fixture mounting hole 404, for sectional fixture, utilizes clamp electrical sheet.Adopting the object of pressure guide piece is to make sample free vibration in the longitudinal direction under compressive stress, does not produce in vertical direction distortion.
As shown in Figure 5, a kind of electrical sheet magnetostriction measurement method, comprises the steps:
Step 1, computer control AWG (Arbitrary Waveform Generator) produces expectation waveform;
Step 2, expectation waveform is after power amplifier amplifies, to the sample excitation in excitation unit;
Step 3, laser vibration measurer is measured the magnetostriction vibration speed of excitation unit, and the vibration velocity of measurement is sent to Multichannel data acquisition device;
Step 4, Multichannel data acquisition device receives the magnetostriction vibration speed that laser vibration measurer sends, gather the coil-induced voltage of elementary exciting current, H and secondary induction voltage in excitation unit simultaneously, utilize its inner analog subtracter to make secondary induction voltage deduct the coil-induced voltage of H, obtain magnetic polarization induced voltage, and then send to computing machine;
Step 5, computing machine carries out digital frequency analysis to magnetic polarization induced voltage, controls AWG (Arbitrary Waveform Generator) and changes waveform, utilizes process of iteration to make magnetic polarization induction voltage waveform for expectation waveform;
Step 6, vibrates the magnetostriction loop line of speed, elementary exciting current and magnetic polarization calculation of lightning induced voltage sample at magnetic polarization induction voltage waveform for expecting under waveform strip part, utilize the magnetostriction now obtaining.
Under same frequency and same magnetic polarization intensity peak condition, magnetostriction loop line is not unique, its shape is directly related with magnetic history, in order to emphasize comparability, necessarily require flux waveforms be sinusoidal (be magnetic polarization induction voltage waveform coefficient 1.1107 ± 1% in), make magnetostriction loop line unique.In the present invention by magnetic polarization induced signal is carried out to digital frequency analysis, then change AWG (Arbitrary Waveform Generator) waveform, utilize process of iteration to make magnetic polarization induced signal waveform sinusoidal, replace traditional analog feedback loop, there is the features such as little, the difficult concussion of waveform distortion and wide frequency range.
The specific implementation of calculating the magnetostriction loop line of sample in step 6 is: by magnetostriction vibration speed and magnetic polarization induced voltage numerical integration in one-period, thereby obtain magnetostrictive displacement waveform and magnetic polarization waveform; From waveform, obtain the loop line that magnetostriction changes with magnetic polarization; Calculate the product of one-period internal magnetic pole intensity induced voltage and elementary exciting current, thereby calculate sample loss.
In the present invention, sample is operated under closed magnetic circuit condition, and can in direction of magnetization, apply tension and the compressive stress of 0-10MPa, and survey frequency is 20Hz-400Hz, can, to sample excitation under sinusoidal waveform of magnetic flux condition, measure magnetostriction loop line.Magnetostriction vibration adopts laser vibration measurer to measure, and laser vibration measurer is measured the vibration velocity of gained and processed through Multichannel data acquisition device sampling and computer data the displacement that is converted into sample.Laser vibration measurer has the features such as high, the reproducible and magnitude tracing of accuracy of measurement is convenient.When adopting the tested siliconized plate of 500*100mm, survey frequency of the present invention is 20Hz-400Hz, and displacement measurement resolution reaches 3nm, and magnetostriction coefficient resolution is 1 * 10-8, and repdocutbility is better than 5%.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an electrical sheet magnetostriction measurement system, is characterized in that, comprises computing machine, AWG (Arbitrary Waveform Generator), power amplifier, excitation unit, laser vibration measurer and Multichannel data acquisition device;
Described computing machine, it produces waveform for controlling AWG (Arbitrary Waveform Generator), the data analysis for Multichannel data acquisition device is uploaded also, control AWG (Arbitrary Waveform Generator) and change waveform, utilize iterative algorithm to obtain the expectation waveform of magnetic polarization induced voltage, and then calculate sample magnetostriction loop line;
Described AWG (Arbitrary Waveform Generator), it for producing random waveform and sending to power amplifier, also for Multichannel data acquisition device provides synchronous sampling signal under computer control;
Described power amplifier, it amplifies processing for the waveform that AWG (Arbitrary Waveform Generator) is sent, and then sends to excitation unit;
Described excitation unit, it,, for fixing sample, is operated under closed magnetic circuit condition sample, is sample excitation, simultaneously stress application in direction of magnetization;
Described laser vibration measurer, it vibrates speed for measuring the magnetostriction of excitation unit, and the vibration velocity of measurement is sent to Multichannel data acquisition device;
Described Multichannel data acquisition device, the vibration velocity that it sends for receiving laser vibration measurer, also for gathering the electric current and voltage data of excitation unit and processing, sends to computing machine by the data after processing.
2. a kind of electrical sheet magnetostriction measurement system according to claim 1, is characterized in that, described excitation unit comprises that level " returns " shape yoke, measures wire frame, pressue device and pressure guide piece;
Described level " is returned " laterally fixation measuring wire frame of shape yoke middle part, described pressure guide piece is hollow, rectangular structure, sample is fixed in pressure guide piece, and described pressure guide piece level is through measuring wire frame, and two ends ride over level and " return " in shape yoke.
3. a kind of electrical sheet magnetostriction measurement system according to claim 2, it is characterized in that, described level " is returned " shape yoke and is adopted silicon steel laminations to form " returning " word shape, and its outer ring square length of side is 500mm, the inner ring square length of side is 300mm, and lamination thickness is 25mm.
4. a kind of electrical sheet magnetostriction measurement system according to claim 2, is characterized in that, described measurement wire frame comprises skeleton, armature winding, secondary winding, a H coil and the 2nd H coil; Described skeleton is rectangular hollow platy structure, its inner rectangular enclosure that forms, the one H coil and the 2nd H coil are installed respectively in the upper and lower both sides of skeleton, and take skeleton, a H coil and the 2nd H coil is axle coiling secondary winding, and then at the outside of secondary winding coiling armature winding.
5. a kind of electrical sheet magnetostriction measurement system according to claim 4, is characterized in that, described skeleton internal cavities height is 5mm, and width is 106mm.
6. a kind of electrical sheet magnetostriction measurement system according to claim 2, it is characterized in that, described pressure guide piece comprises upper mounted plate and bottom plate, sample is placed on bottom plate, upper mounted plate and sample keep certain interval, fixed plate is provided with reflective mirror mounting hole and fixture mounting hole, the reflective mirror that described reflective mirror mounting hole is used for laser vibration measurer is installed, described fixture mounting hole sectional fixture, for clamping one end of sample, the other end of sample connects pressue device.
7. a kind of electrical sheet magnetostriction measurement system according to claim 6, it is characterized in that, described bottom plate is smooth plates, and the gap between fixed plate and sample is 0.1mm, fixed thickness of slab is 3mm, and bottom plate is thick is 0.1 to 1mm.
8. a kind of electrical sheet magnetostriction measurement system according to claim 1, it is characterized in that, the electric current and voltage data of described Multichannel data acquisition device collection comprise elementary exciting current, the coil-induced voltage of H and secondary induction voltage, described Multichannel data acquisition device inside comprises analog subtracter, utilize analog subtracter to make secondary induction voltage deduct the coil-induced voltage of H, thereby obtain magnetic polarization induced voltage.
9. an electrical sheet magnetostriction measurement method, is characterized in that, comprises the steps:
Step 1, computer control AWG (Arbitrary Waveform Generator) produces expectation waveform;
Step 2, expectation waveform is after power amplifier amplifies, to the sample excitation in excitation unit;
Step 3, laser vibration measurer is measured the magnetostriction vibration speed of excitation unit, and the vibration velocity of measurement is sent to Multichannel data acquisition device;
Step 4, Multichannel data acquisition device receives the magnetostriction vibration speed that laser vibration measurer sends, gather the coil-induced voltage of elementary exciting current, H and secondary induction voltage in excitation unit simultaneously, utilize its inner analog subtracter to make secondary induction voltage deduct the coil-induced voltage of H, obtain magnetic polarization induced voltage, and then send to computing machine;
Step 5, computing machine carries out digital frequency analysis to magnetic polarization induced voltage, controls AWG (Arbitrary Waveform Generator) and changes waveform, utilizes process of iteration to make magnetic polarization induction voltage waveform for expectation waveform;
Step 6, vibrates the magnetostriction loop line of speed, elementary exciting current and magnetic polarization calculation of lightning induced voltage sample at magnetic polarization induction voltage waveform for expecting under waveform strip part, utilize the magnetostriction now obtaining.
10. a kind of electrical sheet magnetostriction measurement method according to claim 9, it is characterized in that, the specific implementation of calculating the magnetostriction loop line of sample in step 6 is: by magnetostriction vibration speed and magnetic polarization induced voltage numerical integration in one-period, thereby obtain magnetostrictive displacement waveform and magnetic polarization waveform; From waveform, obtain the loop line that magnetostriction changes with magnetic polarization; Calculate the product of a cycle internal magnetic pole intensity induced voltage and elementary exciting current, thereby calculate sample loss.
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