SU845125A1

SU845125A1 - Device for rejecting magnetic cores

Info

Publication number: SU845125A1
Application number: SU792794116A
Authority: SU
Inventors: Олег Георгиевич Ширинян; Борис Борисович Винокуров; Владимир Юрьевич Соснин
Priority date: 1979-07-13
Filing date: 1979-07-13
Publication date: 1981-07-07

Description

Изобретение относится к магнитным измерениям и предназначено для идентификации магнитных сердечников по совокупности магнитных параметров.The invention relates to magnetic measurements and is intended to identify magnetic cores by a combination of magnetic parameters.

Известно устройство для сортиров- * ки магнитопроводов, содержащее источник питания, последовательно соединенные намагничивающие обмотки испытуемого и эталонного магнитопроводов, вторичные обмотки которых вклю- ’С чены дифференциально, интегрирующий усилитель и осциллограф, которые в совокупности реализуют принцип выделения разности магнитных петель гистерезиса Г1Ц · •Однако известное устройство обладает невысокой точностью, так как идентификация магнитных сердечников в пары производится путем сравнения петель гистерезиса испытуемого и 20 эталонного сердечников на экране осциллографического индикатора и зависит от субъективных качеств оператора, что снижает надежность испытаний.A device is known for sorting magnetic cores *, containing a power source, magnetizing windings of the test and reference magnetic cores connected in series, the secondary windings of which are included differentially, an integrating amplifier and an oscilloscope, which together implement the principle of distinguishing the difference of the magnetic hysteresis loops G1C · • However, the known device has low accuracy, since the identification of magnetic cores in pairs is carried out by comparing the hysteresis loops tested emogo and cores 20 to reference oscillographic display screen depends on the subjective qualities of the operator, which lowers reliability of the tests.

Известно также устройство для сор-25 тировки магнитопроводов, содержащее источник питания, последовательно соединенные намагничивающие обмотки испытуемого и эталонного магнитопроводов, программный блок, коммутатор, . 30Also known is a device for sorting 25 magnetic cores, comprising a power source, serially connected magnetizing windings of the test and reference magnetic cores, a program unit, a switch,. thirty

......... ... ___________1.......... ... ___________1.

усилитель, амплитудный и временной селектор и блок индикации [2]. Однако это устройство обладает невысокой точностью, так как сортировка магнитопроводов производится по разностной. ЭДС, наводимой во вторичных обмотках сердечников, что неполно отражает магнитные свойства сердечников и снижает достоверность сортировки.amplifier, amplitude and time selector and indication unit [2]. However, this device has low accuracy, since the sorting of magnetic cores is made by difference. EMF induced in the secondary windings of the cores, which does not fully reflect the magnetic properties of the cores and reduces the reliability of sorting.

Известно также устройство, содержащее эталонное изделие, намагничивающие обмотки, соединенные последовательно с генератором тока и образцовым резистором, измерительные обмотки, соединенные дифференциально и подключенные ко входу интегратора, устройство выборки и запоминания, сигнальный вход которого подключен к выходу интегратора, а управлягацийк выходу формирователя стробимпульсов, подключенного своим входом к образцовому резистору, компаратор, первый вход которого связан с выходом устройства выборки и запоминания, а второй - с источником опорного сигнала, блок индикации и сигнализации и·.It is also known a device containing a reference product, magnetizing windings connected in series with a current generator and an exemplary resistor, measuring windings connected differentially and connected to the integrator input, a sampling and storage device, the signal input of which is connected to the integrator output, and the control input to the output of the strobe pulse generator, connected by its input to a model resistor, a comparator, the first input of which is connected to the output of the sampling and storage device, and the second to the regular enrollment of the reference signal, the display unit and the signaling and +.

Это устройство реализует контроль по разности мгновенных значений од ного из параметров динамического цикла перемагничивания, например, динамической остаточной индукции, что не позволяет говорить о полной идентичности подбираемых в пары магнитных сердечников.This device monitors the difference in instantaneous values of one of the parameters of the dynamic magnetization reversal cycle, for example, dynamic residual induction, which does not allow us to speak about the complete identity of the magnetic cores selected in pairs.

Целью настоящего изобретения является повышение достоверности идентификации магнитных сердечников.The aim of the present invention is to increase the reliability of the identification of magnetic cores.

Эта цель достигается За счет того, что устройство для разбраковки магнитных сердечников, содержащее две намагничивающие обмотки, соединенные последовательно с генератором тока и образцовым резистором, измерительные обмотки,, соединенные дифференциально и подключенные ко входу интегратора, блок выборки и запоминания, сигнальный вход которого подключен к выходу интегратора, а управляющий - к выходу формирователя стробимпульсов, подключенного своим входом к образцовому резистору,, компаратор, первый вход которого связан с выходом блока вы-, борки и· запоминания, а второй - с источником опорного сигнала, и блок сигнализации, снабжено вторым блоком выборки и запоминания, своим сигнальным входом подключенным к выходу интегратора, фазбзадатчиком, вторым формирователем стробимпульсов, соединенным своим входом через фазозадатчик с образцовым резистором, а выходом с управляющим входом второго блока выборки и запоминания, амплитудным детектором, вход которого подключен к выходу интегратора, вторйм и третьим компараторами, первые входы которых связаны соответственно с выходами второго блока выборки и запоминания и амплитудного детектора, а вторыесо вторым и третьим выходами источника опорных сигналов и логическим блоком, первый, второй и Третий входы которого подсоединены к выходам компараторов а его выход подключен ко входу блока сигнализации.This goal is achieved due to the fact that the device for sorting magnetic cores, containing two magnetizing windings connected in series with a current generator and an exemplary resistor, measuring windings, connected differentially and connected to the integrator input, a sampling and storage unit, the signal input of which is connected to the output of the integrator, and the control - to the output of the shaper pulse generator, connected by its input to the model resistor, a comparator, the first input of which is connected to the output of the block s-, bores and · storing, and the second with the source of the reference signal, and the signaling unit, is equipped with a second block of sampling and storing, its signal input connected to the output of the integrator, phase sensor, the second driver of the strobe pulses connected to the input through the phase sensor with a model resistor, and an output with a control input of the second block of sampling and storage, an amplitude detector, the input of which is connected to the output of the integrator, the second and third comparators, the first inputs of which are connected respectively with the outputs second sampling and memorizing unit and an amplitude detector, and second and third vtoryeso outputs a reference signal source and logic unit, the first, second and third inputs of which are connected to the outputs of the comparator and its output connected to the input of the alarm unit.

На фиг. 1 представлена структурная схема предлагаемого устройства; на фиг. 2 - разностная динамическая кривая перемагничивания для сравниваемых магнитных сердечников.In FIG. 1 presents a structural diagram of the proposed device; in FIG. 2 - differential dynamic magnetization reversal curve for compared magnetic cores.

Устройство для разбраковки магнитных сердечников содержит подключаемое к испытуемому изделию 1 эталонное изделие 2, источник намагничивающего поля в виде последовательно соединенных генератора тока 3, образцового резистора 4 и намагничивающих обмоток 5 и 6.A device for sorting magnetic cores contains a reference product 2 connected to the test product 1, a magnetizing field source in the form of a series current generator 3, a reference resistor 4 and magnetizing windings 5 and 6.

Измерительные обмотки 7 и 8, соединенные между собой дифференциально, подключены ко входу интегратора 9. к выходу которого подсоединены входы двух блоков 10 и 11 выборки и запоминания мгновенных значений аналоговых сигналов и вход амплитудного детектора 12. Управляющий вход блока 10 вы борки и запоминания через формирователь-13 стробимпульсов связан с образцовым резистором 4, а управляющий вход блока 11 выборки и запоминания связан с резистором 4 через фазозадатчик 14 и формирователь 15 стробимпульсов. Выходы блоков 10 и 11 выборки и запоминания и амплитудного детектора 12 подключены к первым . входам соответственно, компараторов 16-18, а их вторые входы связаны с источником 19 опорных сигналов. Выходы компараторов 16-18 соединены со входами логического блока 20, на выходе которого установлен блок 21 сигнализации.The measuring windings 7 and 8, which are connected differentially, are connected to the input of the integrator 9. To the output of which are connected the inputs of two blocks 10 and 11 of sampling and storing the instantaneous values of the analog signals and the input of the amplitude detector 12. The control input of the block 10 is sampled and stored through the former -13 strobe pulses is connected to the exemplary resistor 4, and the control input of the sampling and storage unit 11 is connected to the resistor 4 through the phase pickup 14 and the strobe generator 15. The outputs of the blocks 10 and 11 of the selection and storage and amplitude detector 12 are connected to the first. the inputs, respectively, of the comparators 16-18, and their second inputs are connected to the source 19 of the reference signals. The outputs of the comparators 16-18 are connected to the inputs of the logical unit 20, the output of which is installed block 21 alarm.

Устройство работает следующим образом.The device operates as follows.

Испытуемое 1 и эталонное 2 изделия, в частности магнитные' сердечники, перемагничиваются в переменном магнитном, поле, создаваемым генератором тока 3 и намагничивающими обмотками 5 и 6. Последовательно в намагничивающую цепь включен образцовый резистор 4, назначение'которого - создание опорных напряжений непосредственно для формирователя 13 стробимпульсов · и через фазозадатчик 14 - для формирователя 15 стробимпульсов. С дифференциально включенных измерительных обмоток 7 и 8 сигнал, пропорциональный разности ЭДС, поступает на вход интегратора 9, на выходе которого будет иметь место напряжение, пропорциональное разности мгновенных значений индукции испытуемого B_x(t) и эталонного Bg_kt) - 4B(t) = Βχ ч t) —Test 1 and reference 2 products, in particular magnetic cores, are magnetized in an alternating magnetic field created by a current generator 3 and magnetizing windings 5 and 6. A model resistor 4 is connected in series to the magnetizing circuit, the purpose of which is to create reference voltages directly for the shaper 13 strobe pulses · and through the phase pickup 14 - for the shaper 15 strobe pulses. From the differential windings 7 and 8, a signal proportional to the difference in the EMF is fed to the input of the integrator 9, the output of which will be a voltage proportional to the difference between the instantaneous values of the induction of the test B _x (t) and the reference Bg _k t) - 4B (t) = Βχ h t) -

В_э (t) . Это напряжение поступает на сигнальные входы блоков 10 и 11 выборки и запоминания мгновенных значений аналоговых сигналов и амплитудного детектора 12.In _e (t). This voltage is supplied to the signal inputs of blocks 10 and 11 of the sampling and storing instantaneous values of analog signals and amplitude detector 12.

Напряжение, снимаемое с блока 10 выборки и запоминания, пропорционально мгновенной разности индукции сравниваемых сердечников в момент перехода кривой намагничивающего тока через нуль, т. е. Δ B_rd (момент времени , Ц на фиг. 2). Это достигается тем, что на его управляющий вход поступает прямоугольный импульс (длительность Ъ = 1—5^С), соответствующий по времени моменту перехода Через нуль снимаемого с образцового резистора 4 (фиг. 1) опорного напряжения, а следовательно и намагничивающего тока.The voltage taken from the sampling and storing unit 10 is proportional to the instantaneous difference in the induction of the compared cores at the moment the magnetizing current curve passes through zero, that is, Δ B _r d (time instant, Ts in Fig. 2). This is achieved by the fact that a rectangular pulse (duration b = 1-5 ^ C) corresponding to the time of the transition through the zero of the reference voltage removed from the reference resistor 4 (Fig. 1) and, therefore, the magnetizing current, is supplied to its control input.

Напряжение, снимаемое с блока 11 выборки и запоминания, пропорционально разности максимальных индукций Δ В (момент времени t_a, на фиг. 2;. Это обеспечивается введением в структуру формирователя 15 стробимпульсов (фиг. 1) дополнительного фазозадатчика 14, создающего дополнительный 90-градусный сдвиг опорного напряжения, на входе собственного формирователя стробимпульсов.The voltage taken from the sampling and storing unit 11 is proportional to the difference of the maximum inductions Δ B (time t _a , in Fig. 2; this is achieved by introducing an additional phase detector 14 into the structure of the driver 15 (Fig. 1), creating an additional 90-degree a shift of the reference voltage at the input of its own shaper of strobe pulses.

Напряжение, снимаемое с амплитудного детектора 12, пропорционально максимальной разности мгновенных значений индукций Δ , точный момент времени которых может быть не определен (момент , t.¹ на фиг. 2). _The voltage taken from the amplitude detector 12 is proportional to the maximum difference in the instantaneous values of the inductions Δ, the exact time of which may not be determined (moment, t. ¹ in Fig. 2). _

Эти напряжения поступают на пер- ³вые входы компараторов 16-18, на каждый второй вход которых поступают опорные напряжения, вырабатываемые источником опорных сигналов „9. Зна- . _ чения опорных напряжений должны определяться конкретными допусками по контролируемым параметрам 4 Δ В_тб| л ли δ и устанавливаются расчетным или экспериментальным путем.These voltages are supplied to the first ³ inputs of comparators 16-18, for each second input of which reference voltages are generated by the reference signal source “9. Know. _ values of the reference voltages should be determined by specific tolerances for the controlled parameters 4 Δ In _tb | whether δ and are established by calculation or experimentally.

Если указанные выше параметры 15 не выходят э'а пределы допустимых^/ на выходе компараторов 16-18 появляются сигналы, логический блок 2Q, подключенный к Их выходам, формйрует сигнал на блок 21 сигнализации, ко- 20 торый в свою очередь выдает информацию о годности испытуемого изделия.If the above parameters 15 do not go out of range, the signals appear at the output of the comparators 16-18, the logic block 2Q, connected to their outputs, forms a signal to the signaling block 21, which in turn gives information about the validity test item.

При выходе хотя бы одного контролируемого ’параметра за допустимые пределы логический блок 20 не сраба- 25 тывает, а блок -21 сигнализации выдает информацию о негодности испытуемого изделия.If at least one parameter monitored beyond the permissible limits, the logic unit 20 does not work, and the signaling unit -21 gives information about the unsuitability of the tested product.

Использование в качестве информативных трех параметров динамических циклов перемагничивания при большой ³⁰производительности контроля значительно повышает достоверность идентификации магнитных сердечников.The use of informative three parameters of dynamic magnetization reversal cycles at a large ³⁰ monitoring performance significantly increases the reliability of the identification of magnetic cores.

Claims

The invention relates to magnetic measurements and is intended to identify magnetic cores by a combination of magnetic parameters. A device for sorting magnetic circuits is known, which contains a power source, serially connected magnetizing windings of the test and reference magnetic circuits, the secondary windings of which are included differentially, integrating an amplifier and an oscilloscope, which collectively realize principle of isolating the difference of hysteresis magnetic loops, isa fll. However, a known device about It lacks high accuracy, since the identification of magnetic cores in pairs is performed by comparing the hysteresis loops of the test and reference cores on the screen of the oscillographic indicator and depends on the subjective qualities of the operator, which reduces the reliability of the tests. connected magnetizing windings of test and reference magnetic circuits, program block, switch / amplifier, amplitude and time th selector and the block 2JOdnako display device has a low accuracy, since the sorting is performed by the magnetic cores of the difference. The emf induced in the secondary windings of the cores, which incompletely reflects the magnetic properties of the Nerdechnikov and reduces the reliability of sorting. It is also known a device containing a reference product, magnetized windings connected in series with a current generator and an exemplary resistor, measuring windings that are differentially connected and connected to the integrator input, a sampling and storage device, the signal input of which is connected to the output of the integrator, and control of the output of the gate driver. connected by its input to a reference resistor, a comparator, the first input of which is connected to the output of the sample and memory device, and the second - with the source of the reference signal, the Gz1 display and alarm unit This device implements the control by the difference of instantaneous values of one of the parameters of the dynamic cycle of magnetization reversal, for example, dynamic residual induction, which does not allow us to speak of the complete identity of magnetic cores matched in pairs. The purpose of the present invention is to increase the reliability of identification of magnetic polar detectors. This goal is achieved due to the fact that a device for sorting out magnetic cores containing two magnetizing windings connected in series with a current generator and a sample resistor, measuring windings that are differentially connected and connected to the integrator input, a sampling and storage unit, the signal input of which is connected to the output the integrator, and the control unit, to the output of the strobe pulse generator, connected by its input to the reference resistor, a comparator, the first input of which is connected to the output of the device ka you- borki i-memorization, and the second - with the source of the reference signal, and the signaling unit, is equipped with the second unit. of sampling and memorization, with its signal input connected to the output in-. tegratrra, phase of the second odds. strobe pulses connected via a phase generator with a sample resistor, and an output with a control input of the second sampling and storage unit, an amplitude detector whose input is connected to the integrator output, the second and third comparators, the first inputs of which are associated respectively with the outputs of the second sampling unit and memory and amplitude detector, and the second with the second and third outputs of the source of reference signals and logic unit, the first, second and third inputs of which are connected to the outputs of the comp ator; and its output is connected to the input of the alarm unit. FIG. 1 shows the structural scheme of the proposed arrangement in FIG. 2 - difference dynamic reversal curve for the compared magnetic cores. The device for screening magnetic cores contains a reference 2, connected to the tested product 1, a source of a magnetizing field in the form of a series-connected current generator 3, an exemplary resistor 4 and magnetizing windings 5 and 6. The measuring windings 7 and 8 connected differentially between connected to the input of the integrator 9. To the output of which are connected the inputs of two blocks 10 and 11 of sampling and storing the instantaneous values of the analog signals and the input of the amplitude detector 12. The control input of the tree 10 samples and storing through -13 generator of pulses associated with exemplary resistor 4, and the control unit input 11 and the sample storage coupled to resistor 4 through fazozadatchik shaper 14 and 15 of pulses. The outputs of blocks 10 and 11 of the sample and memory and amplitude detector 12 are connected to the first. inputs, respectively, of comparators 16–18, and their second inputs are connected to a source of 19 reference signals. The outputs of the Comparators 16-18 are connected to the inputs of the logic unit 20, the output of which is set alarm unit 21. The device works as follows. Test 1 and reference 2 products, in particular magnetic cores, are re-magnetized in an alternating magnetic field created by current generator 3 and magnetizing windings 5 and 6. Successively E magnetizing circuit is turned on exemplary resistor 4, the purpose of which is to create reference voltages directly for the former 13 strobes and through a phase encoder 14 - for a driver 15 strobes. From the differentially connected measuring windings 7 and 8, a signal proportional to the difference of the EMF is fed to the input of the integrator 9, the output of which will be a voltage proportional to the difference of the instantaneous values of the induction of the subject) and the reference Bgvt) - AB (t) BX t) - Bglt ). This voltage is applied to the signal inputs of blocks 10 and 11 of sampling and storing instantaneous values of analog signals and amplitude detector 12. The voltage taken from block 10 of sampling and storing is proportional to the instantaneous difference of induction of the compared cores at the moment of transition and magnetization curve of each current through zero, i.e. L V moment of time t- ,, t in FIG. 2). This is achieved by delivering a rectangular pulse (duration C 1-S / tC) to its control input, corresponding to the time at which the zero transition from the reference resistor 4 (Fig. 1) of the reference voltage, and therefore the magnetizing current, passes. The voltage removed from sampling and memorizing unit 11 is proportional to the difference in maximum inductions dB (time t, t in Fig. 2). This is ensured by introducing into the structure of the former 15 strobe pulses of Fig. 1 an additional phase generator 14, which creates an additional 90 degree shift of the reference voltage, at the input of its own gate driver. The voltage taken from the amplitude detector 12 is proportional to the maximum difference of the instantaneous values of the inductions JU, the exact time instant of which may not be determined by the V moment t., T. in fig. 2). These voltages are fed to the first inputs of the comparators 16-18, each second input of which receives the reference voltages produced by the source of the reference signals 1.9. The values of the reference voltages should be determined by specific tolerances on the monitored parameters 4 V., Ll l and set 7 by even or experimentally. If the above parameters do not go beyond the permissible limits, signals appear at the output of the comparators 16–18, logical block 2 (5 connected to their outputs, forming a signal to the alarm block 21, which in turn gives information about the validity of the subject When at least one monitored parameter exceeds the permissible limits, logic block 20 does not work, and the signaling block 21 gives information about the unsuitability of the tested product. A device for screening magnetic cores containing two magnetizing windings connected in series with a current generator and a reference resistor, 1 measuring windings that are differentially connected and connected to the input of the integrator, the sampling unit and memory, the signal input of which is connected to the integrator output, and the control one - to the output of the gate driver connected by its input to a sample resistor, a comparator, the first input of which is connected to the output of the sample and hold unit, and the second to the reference signal source, and an alarm unit, characterized in that, in order to increase the identification accuracy, it is equipped with a second unit sampling and storing, with its signal input connected to the integrator output, a phase generator, a second gate driver, a phase sensor connected to its input with a sample resistor, and the output with a control input and sampling and storing, by an amplitude detector whose input podklpchen to the output of the integrator, the second and third kompars; srami, the first inputs of which are, respectively, with the outputs of the second sampling and memory unit and the amplitude detector, and the second with the second and third outputs of the reference signal source, and the logic unit, the first, second and third inputs of which are connected to the outputs of the comparators, and its output is connected to the input of the alarm unit. Sources of information taken into account in the examination 1.Patent of Japan No. .49-20557, cl. G 01 R 33/12, 1974.

2. Authors certificate of the USSR 506815, cl. G 01 R 33/12, 1976.

3.Shirin N. G. Electromagnetic methods of quality control of products. Sat reports of the III All-Union Conference. Kuybaiev, 1978, p. 145 prototype)