SU1026101A1 - Aggregating magnetic amplifire core checking method - Google Patents

Abstract

METHOD FOR CONTROL OF CORES FOR ACCUMULATION OF MAGNETIC AMPLIFIER, comprising peremagnychivanii serdechyikov on frequency cycle and the measurement of the strength of the magnetization-reversal field, characterized in that, in order to increase the accuracy of control, remagnetized cores sequence of alternating, rectangular pulses emf with a predetermined amplitude of induction, isolated one from the half-periods of the intensity of the reversal field, they form a rectangular pulse with an amplitude proportional to the average value of the voltage Values on the selected half-period, and synchronous with the magnetizing emf, compare the intensity of the magnetization reversal field with the Formed pulse and the amplitude of the mean value of their difference over the half-period is the magnetizing permeability of the core.

Description

The invention relates to magnetic measurements and is intended to monitor cores used to manufacture storage magnetic amplifiers. The ammeter-voltmeter method is known, based on controlling cores by basic magnetic parameters, such as saturation induction Bd, residual induction B, -, coercive force Hp, which is determined by a measured voltage value proportional to the magnetizing current and voltage induced in the measuring winding, when the monitored core is re-magnified by the limiting hysteresis loop 1. However, this method is characterized by the fact that its measurement accuracy is not sufficient. The known method 2j of controlling the ferromagnetic cores by the average permeability in the frequency cycle, consisting in the reversal of the controlled ferromagnetic core through partial cycles vC, measuring stresses proportional to the induction increment and the field intensity in the core. With respect to the magnitude of the voltage proportional to the increment of induction of the core to the magnitude of the voltage proportional to the increment of the intensity of the remagnetizing field, the value of the permeability ratio p of the ferromagnetic core on the private cycle bg-Bi 00 pcr-cTc / Ch where l is B, jH - accordingly, the induction increments and the tension in the floor in the core during the magnetic reversal of the core along the partial cycle. The disadvantage of this sp-singa is the low accuracy of control of the cores used for the manufacture of storage magnetic amplifiers. This is due to the fact that the average magnetic permeability by which the quality of the core is judged by a known method, ambiguously characterizes the maximum magnetic permeability, which is the main magnetic parameter determining the characteristics of the storage magnetic amplifier. The ambiguity of the mean and maximal permeability of magnetic permeability is illustrated in FIG. 1a and b, which shows two partial hysteresis cycles having the same values of W (.p and different values. The purpose of the invention is to improve the accuracy of control of cores for storage magnetic amplifiers. This goal is achieved due to the method of testing cores of SLE for accumulative magnetic amplifiers, concluding in re-magnetization of the cores in a particular cycle and measuring the intensity of the re-magnetizing field, the cores are re-magnetized by a sequence of alternating, rectangular EMF pulses with a given amplitude of induction, one of the half-periods of the intensity of the reversing magnetic field, forming a rectangular pulse with an amplitude proportional to the average value of the stress on the selected half-period, and synchronous with the reversing EMF, are compared. the values of their half-period differences judge the magnetic permeability of the core. Fig. 1 shows partial cycles of hysteresis; in fig. 2 — timing charts explaining the operation of the method; in fig. 3 - a device that implements this method; in fig. 4 timing diagrams explaining the operation of the device. The remagnetization of the core along a symmetric partial cycle with a predetermined amplitude of induction D.V const corresponds to its operating mode of the magnetization reversal in a storage magnetic amplifier. In this case, as follows from expression (1), the magnetic permeability is uniquely determined by the difference in the strengths of LN. Moreover, to determine the magnetic permeability on the upward (downward) branch of the partial cycle, it is necessary to determine (the difference in the strengths of the DN, corresponding to the selected area (for the upstream part of the cycle in Fig. 1 - iH). This difference can be determined from the current value of the intensity. As can be seen from Fig. 2, and the time diagrams of the magnetization reversal cores are shown for the individual EMF cycles (t ) and April field strength H in the core (-t), and the difference L H (t) and the average znache.ni u) at a positive half cycle, overspeed. is equal to twice the maximum value of the difference of the current intensity at the half-period ti C ls corresponding to the relevant part of the cycle (ascending, descending), and its average value at this half-peru. in view of what has been said, for the maximum absolute magnetic permeability of the core per hour 1 cycle, expression (1) takes the form Iff n Ne ftnaxLM (i) -Hcfl .lt; .tH; 4l. j-mQx H (t) .t, .f J (2) where k is a constant coefficient. The device contains a source of 1 EMF pulses connected via shunt-2 to magnetizing winding 3, summing amplifier 4, one of the outputs of which is connected to shunt 2, the other to the output of amplifier 5 with adjustable transmission coefficient, input of amplifier 5 is connected to one of the source 1, the integrator 6, whose input through the switch 7 is connected to the output of summing amplifier 4 / zero organ 8, the input of which through the switch 9 is connected to the output of the integrator 6, control circuit 10, the input of which is connected to one of the source outputs 1, and the output - to the control inputs of the keys 7 and 9, amplitudnay De 1tektor 11 / whose input is connected to the output of the integrator 6, the measuring device 12 connected to the output of the amplitude detector 11. Namagnichivayuscha winding 3 is applied to the core 13. troliruemy con. .In FIG. Figure 4 shows the time diagrams of operation of the device for three values of voltage Uj at the output of amplifier 5 with adjustable transmission coefficient: the voltage Ug at the output of amplifier 5 is less than / the voltage corresponding to the average value of the field voltage in the core for the selected half period ( ), the voltage and 5 on the output of the amplifier l 5 is equal to the voltage corresponding to the average value of the voltage for the half period () voltage I) 5-at the output of the amplifier 5 is greater than the voltage corresponding to the average value of the voltage of the floor for the half period (it ). The method is carried out as follows. The core 13 from the source 1 of the rectangular pulses of the EMF is re-magnetized in partial cycles with a given amplitude of induction, this mode corresponds to the operating mode of the re-magnetization of the core of the memory card. The voltage U | {(Fig. 4), proportional to the magnetizing current and, consequently, the field voltage in the core 13, is removed from the shunt .2 and fed to one and the inputs of the summing amplifier 4. To the other input of the amplifier 4 from the output of amplifier 5 With an adjustable transfer ratio, the voltage Uf is magnified by the value of the field in the core for the selected half period, which is proportional to the average value of the voltage, and by the opposite polarity of the loading voltage Ots. The sign on which the gain ratio of amplifier 5 is set in such a way that the amplitude of the voltage at its output is proportional to the average value of the voltage on the selected half-period is the equality of the voltage U to the output of the integrator b for the selected half-period - zero (Fig. 3 at C it with ± 2). The selection of one of the half-periods of the voltage Uy proportional to the difference B - Hcr: or Hc - I) is made by key 7. The choice of one or another half-cycle essentially determines that part of the private cycle (upstream, or downstream), where the measurement is made magnetic permeability. The sampling voltage Ugc of the integrator b at the end of the half-period at the input of the zero-organ 8 is performed by the key 9. The operation of the keys 7. and 9 is controlled by the circuit 10, whose operation is synchronized by the source 1. The amplitude of the voltage U at the output of the integrator b is converted by the amplitude detector 11 into constant voltage and is measured by the device 12. It should be noted that the shape of a real private cycle is somewhat different from its approximation jot (Fig. 1) and the current field voltage in the heart is close in shape to Up (Fig. 4). Therefore, the magnetic permeability and the core are judged not by the amplitude of the difference H - which the Knife should be measured at the output of summing amplifier 4, but by the amplitude of the average value of this dimension. In this case, the voltage t / 4 at the output of the amplitude detector 11 is related to the difference in voltage by the expression: & cp-GgTv UN, 0625. where K ,, K are, respectively, the transfer coefficients of the summing amplifier 4. and the amplitude detector 11, W (j, Ver — respectively, the number of turns of the winding 3 on the controlled core 13 and the length of the average magnetic power line of the core 13 / duration the period of rectangular impulses emf source 1,. {-6 constant of time integrator 6,

Ut is the resistance of the shunt 2, K is a constant coefficient.

Thus, the proposed method of controlling cores allows determining the maximum magnetic permeability and, re-loosing on private cycles and, consequently, increasing the accuracy of monitoring cores for magnetic magnetic amplifiers. In addition, it allows the monitoring of cores; nose to core is only one winding with a small number of turns, which can be made of a detachable structure, which allows to increase productivity and reduces the cost of winding materials.

Ng

CP ъ

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N /

Fi9.2

Ej

Uch

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itz

7 V

S

t t

Tv

I

FIG.

Claims (1)

METHOD OF CORE CONTROL FOR ACCUMULATING MAGNETIC AMPLIFIERS, which consists in magnetization reversal of the cores according to the frequency cycle and measurement of the magnetizing field strength, characterized in that, in order to increase the control accuracy, the cores are magnetized by a sequence of alternating, rectangular emf pulses from the emf from the remagnetizing field strengths. A rectangular pulse is formed with an amplitude proportional to the average value of the intensity on a dedicated poluperiodo and synchronous with remagnetizing EMF, comparing the intensity of the magnetization reversal field with the generated pulse and the amplitude average value of the difference of half period are judged on the magnetic permeability of the core. FIG. 4 Go 1920 G those>