CN2171119Y - Soft magnetic material dynamic parameter measuring device by computer - Google Patents

Abstract

The utility model relates to an MCY-1 type measuring device for the dynamic parameters of magnetic materials, which can test and print the records of the magnetization curves, the dynamic hystersis loops and the relevant parameters of various soft magnetic materials of which the saturation magnetization current is less than 10A. The device organically combines a one-board computer, a screen display, a keyboard printer, a high-speed high-precision sampling A/D conversion interface board and an audio signal source. Moreover, a set of application software is configured to realize the direct measurement on the magnetization curves, the hysteresis loops, the dynamic parameters of Br, Hc, Bs, and the areas S of the loops of the soft magnetic materials and components.

Description

Soft magnetic material dynamic parameter measuring device by computer

The present invention relates to soft magnetic material dynamic parameter microcomputer measuring equipment, be suitable for magnetic material and components and parts are carried out dynamic parameter measurement.

At present, magnetic material is carried out dynamic magnetization measure, generally adopt voltammetry, the AC potentiometer method is measured with ac magnetization automatic measurement or soft magnetism audio frequency measurement mechanism, or is measured with oscilloscope method.But they all can't directly measure dynamic parameter.Though the ac magnetization automatic measuring instrument can be measured curve, concrete parameter also needs to find out according to curve the coordinate position of parameter point, can obtain through numerous and diverse mathematical computations again.Thereby all can't be guaranteed in precision, aspect repeated.

It is lower that task of the present utility model provides a kind of compared with prior art cost, can directly measure the dynamic parameter of soft magnetic material, and can observe and print the microcomputer measuring equipment of curve and parameter.

Task of the present utility model is achieved in that a single board computer, screen display, keyboard, printer and high-speed, high precision sampling A/D transfer interface board and audio signal source organically make up and dispose a cover application software, realize the direct measurement of magnetization curve, magnetic hysteresis loop and dynamic parameter Br, Hc, Bs and the loop line area S of soft magnetic material and components and parts.

The ultimate principle that realizes hysteresis measurement is, magnetic cell after adding the ac magnetization electric current that makes it saturated, voltage signal of secondary side coil induction.Magnetization current signal and induced signal, after amplification or attenuation processing, by computing machine a cycle is carried out 640 pointwise samplings, change corresponding binary data into through high-precision A/D again, computing machine is handled these group data, can calculate corresponding magnetic induction density and magnetic field intensity according to following formula:

$\mathrm{Bt}=\frac{\mathrm{<figure-callout\; id="4"\; label="E"\; filenames="922323909\_DRIMG4.png,922323909\_DRIMG5.png"\; state="\{\{state\}\}">E</figure-callout>}}{4\mathrm{\&Omega;fAe}{N}_2}---\left(1\right)$

Wherein: the magnetic induction density when Bt is t

E: be the half period average voltage

F: be frequency

Ae: be average cross-section

N ₂: be number of secondary turns

$\mathrm{Ht}=\frac{\mathrm{Nlit}}{l_e}---\left(2\right)$

Ht: the magnetic field intensity during for t

N ₁: be primary turns

i _t: the current value during for t

l _e: the average magnetic circuit that is measured device is long

The utility model can be depicted as BH curve according to 640 B that gather, the data of H correspondence, and from these two groups of data, obtain the value of corresponding Br, Hc, Bs and S correspondence, utilize the aforementioned calculation formula to calculate the actual value of Br, Hc, Bs and S and be presented on the display again.Wherein Br is that H is 0 o'clock B value, is 0 o'clock H value and Hc is B, the B value when Bs is saturated, and S is the loop line area.The relation curve of the variation between magnetization curve reflection magnetic induction amplitude Bm and the magnetic field amplitude Hm.Progressively adjust magnetization current, variation with electric current, magnetic cell produces different current signal and induced voltage signal, the current amplitude of a series of variations of this of computer acquisition and the amplitude of induced voltage convert corresponding a series of binary number to through A/D, computing machine is handled this series data, it is magnetization curve that each point value of gathering is depicted as corresponding Hm-Bm curve, calculates corresponding Bm, Hm actual value according to above-mentioned formula, and display shows pointwise.All the time show last group data.Above-mentioned two kinds of curves and parameter can start and print on demand.

This covering device adopts computing machine to carry out the calculating of parameters, the computational accuracy height, and speed is fast.Whole test process only needs one minute.Good reproducibility, applicability is strong.A lot of functions are pressed the convenient realization of customer requirements, and system architecture is simple, cost is low, stability is high, be convenient to maintenance.

Accompanying drawing: Fig. 1 is the measuring system block scheme

Fig. 2 is a peak detector circuit for PH figure

Fig. 3 is the sampling holder circuit for SH figure

Fig. 4 is the time schedule controller clock circuit for CLK figure

Fig. 5 is the time schedule controller frequency divider for F figure

Fig. 6 is a time schedule controller sampling controller circuit for CC figure

Fig. 7 is an A/D transfer interface board circuit for AD figure

Narrate the implementation process of this patent in conjunction with the accompanying drawings:

FS is an audio signal source in the accompanying drawing, and therefrom exporting five kinds of frequencies is respectively 50H ₂, 100H ₂, 500H ₂, 1KH ₂, 10KH ₂The 0-10A sinusoidal ac signal, output voltage is divided into third gear, 0-10V, 0-50V, 0-100V, optional one grade as required.

The two ends that detected element L receives audio-source by elementary winding ab and sampling resistor R, by secondary around and cd insert input amplifier.

Artificial setting signal frequency before the energising is selected output voltage input amplifier enlargement factor.Energising aft engine CPU starts, read in frequency f, multiplying power k, pass through CRT monitor, keyboard B utilizes Chinese character base to carry out man-machine conversation, and imports necessary parameter according to the menu that CRT shows with keyboard B, and deposit internal memory in by CPU, enter the test of magnetization curve or magnetic hysteresis loop then.Progressively adjust the input current of FS, electric current flows through the former limit of L, is paying the limit generation induced voltage vb, and electric current flows through sampling resistor R, produces a pressure drop Vh.Vb and Vh are through amplifier and amplification or decay formation, Vbi and Vhi.And through peak-holding circuit PH ₁And PH ₂Preserve its crest voltage Vbp and Vhp.As survey magnetization curve CPU by time schedule controller CC selector switch SW ₁And SW ₂Applied signal voltage Vbp and Vhp are through sampling holder SH ₁And SH ₂To A/D converter AD ₁And AD ₂CPU is by time schedule controller CC conversion command, convert signal voltage Vbp and Vhp to data, deliver to internal memory, by formula calculate Bm and Hm value, on CRT, the Bm of this point and this point and Hm value and added current peak Im value are shown at CRT with control language.Constantly sampling shows according to this, will demonstrate a curve on CRT, is magnetization curve.Bm, the Hm that shows, Bm, Hm, the Im value that Im value is last point forever are as reaching when saturated, by the keyboard B end of ordering.Print if desired, printer LP prints curve and necessary parameter.

If survey magnetic hysteresis loop, when magnetization current transfers to the operator when approving, the counter of CPU in time schedule controller CC send a binary number, one-period divides which point is surveyed just give which number at 640, just send 3 when for example surveying at the 3rd, clock on the time schedule controller and frequency divider F enter work, allow counter do subtraction most 0, start selector switch SW ₁, SW ₂Send sampling holder SH with the signal Vbi and the Vhi of input ₁, SH ₂Store, and start A/D, conversion AD ₁, AD ₂Convert Vbi, Vhi to 12 bit binary data, CPU deposits these data in database.640 have all been gathered the back and calculated Bt, Ht respective value at 640, and demonstrating the B-H relation curve by CRT is magnetic hysteresis loop, and finding out H with program is that 0 o'clock B value is Br, and B is that 0 o'clock H value is the maximal value Bs value of Hc and B.The Br that CPU goes out computing machine, the actual value of Hc, Bs is by showing on the CRT.As calculating loop line area CPU, obtain the loop line area and show by CRT to whole loop line area integral.As selective printing, start typewriter loop line and parameter Print All thereof are gone out.Repeat to get final product when need under the situation of parameter unanimity, testing again by keyboard B.The everything of CPU is realized by corresponding program in the whole process.Native system is the utility model device by hardware combinations.And dispose corresponding software, realize the measuring process of its knot soft magnetic material dynamic parameter.

Claims (2)

1, soft magnetic material dynamic parameter microcomputer measuring equipment is characterized in that it is made up of one board microcomputer, screen display, keyboard, printer, high-speed, high precision sampling A/D conversion equipment and high-power audio signal source.

2, soft magnetic material dynamic parameter microcomputer measuring equipment according to claim 1 is characterized in that high-speed, high precision sampling A/D transfer interface board is made up of peak detctor, time schedule controller, sampling controller, sampling holder, 12 A/D converters.

Images