SU63387A1 - Device for compensatory measurements of magnetic flux - Google Patents

Description

With the existing Methods of measuring the magnetic flux (and through it induction, sex, etc.), using a ballistic galamometer, two quantities are subject to determination: the debris of a ballistic galvanometer and the so-called bilistic constant, determining: a. galvanometer sensitivity. The latter depend on the values of the resistance to which the galvanometer is closed, and therefore, when changing the measuring coils of sludge and changing the control resistances, it is determined anew each time, which takes a lot of time and requires special equipment of the coil-mutual induction and suitable 10 ammeter first class accuracy. Accurate reading of large waste of a ballistic galvanometer is also very tedious for the observer, not to say that “Paragranal” operation of the galvanometer at large angles of inclination creates high demands on the galvanometer itself (regarding the uniformity of the floor in the mirror of its measuring system) All distant galvanic anometers, manufactured by our industry, are satisfied.

Similar difficulties in measuring the range of electrical quantities (resistivity, - for example | Eugene, etc.) were successfully obtained by introducing the compensatory principle. At the same time, the galvanometer transforms, als -from an accurate instrument into the instrument-pointer, from which only sufficiently high sensitivity is required, but the constancy of this sensitivity and correct operation with large debris is not required. The measured value in this case is counted directly on the compensator curbels (potentiometer, bridge, etc.), which unloads the cost of the worker.

The same compensation principle can also be applied (and applied) in ballistic measurements. For this in; the usual. The ballistic-lvanometry chain must also be supplemented by an additional adjustable source of magnetic flux. In which: simultaneously with a change in the measured flow, a change in flow would be caused. The direction is opposite to the measured flow. In this case, with the n-Eravenoty of these flows; the galvanometer will give waste to one side or the other (B WA: depending on the difference in flow) and when they are equal, C Twe remains. HL “HLE, regardless of its sensitivity.

The source of such a compensating flow could be a conventional coil of mutual induction, silt (without a ferromagnetic core) in which the magnetic flux could be regulated - by changing the current in its primary winding. But it would require a change of the power current in a very wide range and the use of devices to accurately measure the POWER of this current. This is cumbersome, inconvenient and practically “not applied.,

According to the present iso: breteyia, in the proposed device, the kurbel magnetic flux shop is used as a magnetic flux standard, consisting of a tofferoidal ferromagnetic

the core, "ai which wound the primary and a number of secondary windings, the ends of which are led to the lam. l m of the switch.

The core may consist of any ferromagnetic material (if possible, SOFT) and have the form of a closed ring with a constant cross-section of the neck. To reduce: - Foucault currents, this core should be composed of n (310 layers of sheet material 1: or wire-I. Pervi "the winding is evenly distributed across the whole, circumference. Core And should contain; from dogtupnyh sources (for example, conventional, batteries, sch) ditch, could magnetize, the core rather close to the luster. Then a small additional field, the intensity of the preceding magnetization: the heart. events, all. VIDEO., Magnitsgo - po.sdedeyTVI - i.-, t. D, already: not-be. practically scored on - a- r. resilient) of the induction of the T core. Minor changes. E € I-le namapNichIvayuschego, current bu.; Give, here., Change, resulting ndukts; And: U also weighted; weakness So. that on M1arnichiva11Oshky current can be here; K0 | ntroli | ova5gb € p |} and the help-ig y Vicheskoro: ammeter (instead of

first class device required; when working on a conventional induction coil).

Under these conditions | And x the flux of induction in the core of this coil will have a very high-stability - And can be pro-etalon. If such a core is wound with a secondary obm-otka from sections with decadic subdivisions, to which (the fingers are diverted to tripping switches, then it can be introduced from it (when switching current in the primary winding) into the circuit of a galvanically galvanized gauge

impulse from flow equal to twice the flow of induction of the core, multiplied by; any integer (from il to the total number of turns wound on the secondary winding). This number can be conveniently adjusted by means of Kurbels and, therefore, selected when observing pulse compensation from the measured magnetic flux, similarly to the selection of resistance, 3 washables of the kurbel type. After the compensation is selected, the magnitude of the measured magnetic flux from is read directly on the delivery of Kurbeli. For convenience, 31a further calculations (it is desirable that the induction flux in the core should be some circular value (for example, 500 or SCO Maxwell); this is achieved by approximating the required cross-section of the core and precisely fitting ET: C using, selecting the strength of the pick-up current in the primary winding (this force; current: it is chosen - once and for all, with calibration; the model will be effected: - above the kit, from this coil and a certain ammeter H connected to it, the primary area and - will be,., a-,. from the set-up of the “on-line” reading of an ammeter, at which the induction of the induction of the BI core reaches its nominal value; this indication of the ammeter can be.: 0тд11, on its scale it is black -T01Y) .:

See enclosed, schematic drawing-and. | for the time being (but the device of the two-decade Store- (for simplification of the drawing, only two decades are reflected: section Ci - by ten turns and section Ci by one turn; in practical use, the number of decades is four or five) , and the scheme of its inclusion when shooting with a snagging (switching) curve of magnetiz "; nI | B1a; nor from an arbitrary sample - In an open solenoid or a conventional permeameter. At the same time, there is a rigid mechanical connection between the cross over | chain permeame Tra P and Store M ensures simultaneous current switching (In both chains, which is important for quiet operation of the BG galvanometer. Galvanometer period: must be large enough so that some difference in pulses, resulting from the non-identity of both chains, does not yet cause double galvanometer twitching when switching.If the observation of proiZ | VOD TC

not when switching current, but when saving coils from the coil from the unit, a rigid connection must be established between the resetting mechanism and the switch in the primary circuit of the magazine to ensure possible simultaneous pulses in the galvanometer circuit.

In addition to the objectives of compensation for measurements, the proposed store can replace a set of conventional mutual induction coils for iscex measurements on a constant current.

Present Invention

A device for compensatory measurements of magnetic fluxes using the Ballystatic method, of which: it uses the Kurbel magnetic flux core consisting of a Hi3 toroidal-ferromagnetic core as the magnetic flux standard. in which there are amotaines of the primary and a number of secondary windings, the ends of which are connected to the lamellas of the kurchel switch.

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