SU737895A1 - Device for measuring parameters of magnetically-hard materials - Google Patents

Description

(54) DEVICE FOR MEASUREMENT OF PARAMETERS OF MAGNETIC-SOLID MATERIALS

The invention relates to the field of magnetic measurements and is intended to study the parameters and characteristics of magnetically solid materials. A device for studying ferromagnetic materials is known. Contains electromagnet, induction and magnetic field sensors, magnetic induction and magnetic field measurement channels and recorder 1. However, this device does not allow automatic recording of magnetic field dependence on magnetic induction W (B) and determining the maximum energy WMOKC and coordinates of the point of the demagnetization curve (part of the hysteresis loop in the second quarter) with H and B, necessary for the calculation of magnetic systems, devices with constant magnets. The dependence of W (B),, Nd, and Bj in a known device is determined after the arithmetic code for multiplying H and B at points of the curve, demagnetizing and plotting the graph of W (B) according to points. The error of this definition is W-B ) and W (-. DEPENDS ON the subjective qualities of the operator and, at best, does not exceed ± 5%. The purpose of the invention is to improve the measurement accuracy. To this end, a device for measuring the pyramometer of hard magnetic materials containing an electromagnet, magnetic field the sender, the null tension body, the counter and the decoder connected to the counter input are series-connected units, determining and compensating the initial magnetization, the second amplifier, the zero magnetization body and the magnetizing current control unit, the second input of which through the integrator is connected to the second input of the determination unit and sensations of initial magnetization and the first input of a recording device, a magnetic induction sensor connected in series and a third amplifier connected to the integrator input, and the two keys to his v1yHbdMt podklyuchonShle Vgoru input recording device, introduced in series with the integrator of the first analogue converter code converter kod737895

analogue and unit for determining the first derivative of magnetic energy with respect to time, two — elements of a match, the first codes of which are connected to the output of said determination unit, two registers, the inputs of which are connected to the outputs of elements of coincidence, the second analog-code converter connected between the outputs of the first amplifier and the second input of the first element of coincidence, a null-body of magnetic induction connected between the integrator's output and the first input of the first key, as well as a trigger, whose inputs are connected to the output of the zero-organ namag ichennosti and decoder when etom.vtoroy input of the first key and the first input of the second switch connected to the outputs of the flip-flop, a second input of the second switch, the second input transducer perv.ogo code-to-analog and a second input of the second amplifier connected to

the output of the first amplifier, and the second input of the second matching element is connected to the first input of the code-analog converter.

. The block diagram of the described device is shown in FIG. one; dependence B (I) on FIG. 2. The device consists of the test sample 1, the control unit 2 of the magnetizing current; sensor a 3, the intensity of the magnetic field H, sensor 4 Magnetic induction B, elec. romagnet 5, channel amplifier b. measurements of the magnetic field H, zero-organ 7, analog-code converter 8, amplifier .9 magnetic induction B, integrator 10, converter 11 koi analog, converter 12 analog-code B, operational Amplification of the body 13 of magnetization J, null organ J 14, block 15 for determining and compensating for the magnetization of the sample under study, block 16 for determining the sign of the first derivative of the magnetic, in time, elements of coincidence And 17, 18, counter 19, decoder 20, trigger 21, zero-body B 22, keys 23 and 24, two-piece reconstructed device 25, registers 26, 27,

The device works as follows.

The test sample 1 of a hard magnetic material with a magnetic winding magnetic induction B deposited on it (induction sensor 4) is installed between the poles of the electromagnet 5, the current in the windings of which is regulated: by law, with

y h mi i Oj

i: const, by blocker, eg-: measures.

d-t

com 2 control namignificant current. Usually, in the initial state, the samples of a magnetically hard material are not fully demagnetized and the bladderite is residual magnetization. After determination and compensation of the initial magnetism of the sample under investigation.

four

block 15 outputs a voltage proportional to B to the operational amplifier 13, to the second input of which voltage is applied from the amplifier b, proportional to H,.

The output voltage of the amplifier 13 is proportional. At the time the null organ 14 outputs a signal for reversing the magnetizing current to the magnetizing current control unit 2 of the electromagnet 5, At the two-coordinate self-recording device 25, the dependence B (H) —the return curve — is recorded from point A, the main curve OA magnetization and hysteresis cycle A-B-B-D-A-B (FIG. 2). At this time, the key 24 is open, the key 23 is closed, At point B, the null-organ H is triggered once again, the counter 19 counts the impulse zero of the organ H, the decoder

20 changes state, trigger

21 changes its state, closes the key 24 and opens the key 23, thereby letting us write the dependence W (B) according to S1m. .

The voltage from the output of the converter multiplier code-analogue W 11, proportional (the analog input of converter 11 is supplied with voltage proportional to H from amplifier 6, its code B from digital converter 12 is transmitted to the digital input) through the key 23 to the two coordinate recording device 25 The dependence W (B) is recorded (Fig 2). At the same time, the voltage, proportional to W, is applied to the unit, 16, determining the sign of the first derivative of the magnetic energy over time.

Block 16 is made on the basis of the ADC. equilibration, Ilprf max inflection point of the curve W (B) (point d of fig. 2) block. 16 outputs a signal for printing resolution of the ADC proportional code and for entering into registers 26 and 27 through matching circuits 17 and 18 codes from analog-code converters 8 and 12, proportional respectively to H and B (coordinates of point D in FIG. 2) on the BE demagnetization curve with the maximum magnetic energy W, aKC. At point O of the curve W (B) S-D-O, the zero-organ B 22 is triggered, the key 23 is closed, the registration of the dependence W (B) is stopped,

Claims (1)

Invention Formula A device for measuring the parameters of a magnetically solid material containing an electromagnet, a magnetic field strength sensor connected in series, a first amplifier, a zero force body, a counter and a decoder connected to the counter input in series the connected unit for determining and compensating the initial magnetization, the second amplifier, the zero magnetization body and the control unit of the magnetizing current, the second input of which through the integrator is connected to the second input of the determining and compensation unit of the initial magnetized and the first input of the recording device, successively connected magnetic induction sensor and the third amplifier connected to the integrator input, as well as two keys connected to the second input of a recording device with its own output, different , That, in order to increase the measurement trchnosti, introduced into it in series with the first inverter analog integrator code kodanalog converter unit and determining the first derivative of the magnetic energy at the time of matching between the two elements, first inputs of which are connected to the output of said detecting unit. two registers whose inputs are connected to the outputs of the matching elements, the second analog-code converter connected between the output of the first amplifier and the second input of the first: a matching element, a zero-body of magnetic induction connected between the integrator's output and the first input of the first key, k also a trigger, inputs which are connected to the output of the zero-, organ of magnetization and the decoder, o while the second input of the first key and. The first input of the second key is connected to the trigger outputs, the second input of the second key, the second input of the first code-analog converter and the second 5 input of the second amplifier are connected to the output of the first amplifier, and the input of the second match element is connected to the first code-analog converter input. , 0 Sources of information taken in: vymanyyo During examination 1, USSR Author's Certificate 408246, cl. G 01 And 33/12, 1972,