SU100029A1 - Apparatus for measuring instantaneous values of magnetizing current and magnetic induction - Google Patents

Description

The subject matter of the invention is a device for measuring instantaneous values of us; 1H10101H current and magnetic induction UHF, testing magnetic magnetic materials by induction method in non-magnetic mode, containing a control rectifier for cutting off the current in the arrays of the electrical measuring instrument.

A disadvantage of the known devices of the same purpose, in which mechanical rectifiers are used, is that they can operate only in a narrow frequency range.

The proposed device, which is free from this drawback, can operate in a gyroelectric dianzone frequency of magnetization reversal. This is due to the fact that an electronic-free inertia device controlled by a tiratron circuit is used as the above-rectified rectifier in the device.

The right part of the circuit (see drawing), separated by dashed lines, is the actual circuit of the proposed device, whose terms are as follows: L is an amplifying lamp, used to eliminate the influence of the i5 scattering by ignoring the pressure of the thyratron.

L - tiratron, osup; ustvl yuptii mp-juvenile dawn of the lamp Lz.

L ;; - TRTUDE performing the role

unnergypical machine.

LI - 15pyp) is destructive., Served .1, and as the amplitude limiter of the alternating voltage is zein of the anode of the thyratron.

The Chamia Lg Lee and L-7 enter the 1st unit and they are responsible for 5Mr less than AC and stabilizing the rectified voltage. R i C is denoted by C (X), respectively, sop) eotpvlenn and capacity, D - dross.

Measure. The tampon circuit is connected to the primary and secondary circuits by a magnetizer: voup, its devices are formed in the / - / and // - // terminals.

When the L-thyratron is not lit, the lamina of the grid of the Lz lamna will be sniffing and it can drop the current. Under such conditions, current can flow through it only. In those nanoperiods of change of emf. The measuring winding is shaped when, under its action, the potential of the anode of the lamp Lz becomes positive.

In the other half-period Lamna L, the current does not conduct. Since., MOVED IN PHASE, BUT TO APPARANT TOKV ON

The Lz cut and the zero-dimensional device always starts flowing from the moment of its non-current flowing through the amplitude value. By applying a grid of // 3 negative bias, it can be locked at any moment of a half-period. This way, the current flows through / 7з and the measuring device with intervals in one half-cycle, and the beginning of its flow always corresponds to the moment of transition by magnetizing 1, its current through maximum (negative or positive depending on the matching of the conclusions of the primary and secondary windings sample), and the cut-off time can be changed by changing the moment of locking the lamp // g.

The locking voltage of this lamp is given in dependence on the magnitude of the magnetic field strength of the sample, which is carried out as follows.

When the knife switch is closed, Р ,, is open, P and zero is optional, Jli on the grid (additional blending is set by a variable; resistance connected to the terminals /// - III, and monitored by a voltmeter V), the tiratron is initially mixed (potentiometers Rs and) in a mode close to iodzhiganiyu.

The moment of ignition of the thyratron is recorded by the deviation of the stre; When you turn on a ruby.tnik PI on the grid la.mpy // i voznankaet variable offset, put the hands on the initial and equal to i „R.

In those half-CRYSTALS, when the Imappa-ihchayugyyy current / flows in the direction indicated by an arrow in the drawing, the drop in voltage caused by R increases the negative bias, thereby removing the anode current of the T1 tampa. If with / „About the thyratron (the setting of the initial shift) was on T {Uit ignition, then at the moment of magnetizing current passing through zero value in the area, when its flow corresponds to the arrow indicated in the drawing, the tirotro and / kzhet.

Since when a thyratron is burning, the voltage drop in it is insignificant, then the B moment is ignited in the grid grid of the lamp L :, in relation to the cathode becomes negative and the lamp // is instantly locked.

In this case, the measuring device t A, connected to the circuit L - ,,, will measure the increment, induction B (exclude from saturation induction) corresponding to the zero value of the magnetic field strength in the sample.

By setting a different but absolute sign to the absolute value of the additional displacement t / ,;),., „, From a measured voltmeter V, you can change the moment of locking the lamp D-. If there is an additional charge, the lamp L - ,,, will be locked at those times when paiBeHCTBO comes

rn I

- - (o.G

Knowing the value of additional discrimination and resistance R, from equality

.- / Gnakhod t instantaneous value of 1-1e magnetizing 1; its current, at which the recording takes place.

The magnetizing principle of the magnetized zero in the sample, at which measurement B occurs, can be found from the expression

H PUL n - -,

(- /

Where:

Wi is the number of turns and the sample winding; If ,, is the average length of the magnetic field line of the sample in meters.

By means of additional mixing, it is possible to provide a cut-off of the current in the measuring winding of the sample at any time in the range of the modified magnetizing current from - ". ,, (at that moment to the ceyin lamp L; by way, point by point, remove half of the hysteresis loop. (The second is symmetry of the measured one).

The entire measurement process can be done only if the thyratron is periodically extinguished during those periods of change (2 "when the flow through the Dz lamp does not flow. Then in this case the following half-period