SU6723A1 - Instrument for determining the number of short-circuited turns in coils of enameled wire - Google Patents

Description

The proposed device is intended to determine the number of short-circuited BITKOV in the enameled wire coils, which makes it possible to judge the quality of the enameled wire without unwinding it.

In the drawing there is a kena diagram of the proposed device, which consists of three main parts: an e-bone transformer, an induction transformer and an instrument for measuring small electromotive forces.

A capacitive transformer is designed to reduce the voltage of an external AC source; it consists of two series-connected capacitors C and Sc, of which GI has a bolgluito electrical capacity, 40 m C- ,. Then, when these are connected, eventually connected capacitors in cfiib-alternating current, a voltage of, for example, 130 V (lighting network) —the terminals of a capacitor having a large capacitance Cj, receive a lower AC voltage, the value of which is determined by the ratio tanks C and GS ,.

Induction transformer sufit FROM an iron round core a ,.

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At one end of which a coil L is worn, creating an alternating magnetic flux in the core, and closer to the other end is a thin layer of secondary winding B. Coil k is supplied with alternating current of low voltage, obtained from a capacitive transformer.

To measure the electromotive force at the ends of the secondary winding, a transformer uses a circuit for switching on a cathode lamp and a switch galvanometer of direct current. The anode and the grid of the cathode lamp I are connected together and are adapted to the minus of the galvanometer d plus which is connected to one cond of the secondary winding B, while its other end is connected to the minus of the naiuxia h battery of the lamp. Plus bata1 1M1 filament

h through regulating C0111) 1 TI1C11110

r, the value of which is chosen depending on the lamp used, is connected to the lamp thread and in parallel through the resistance R is supplied to the anode of the lamp.

If the ends of the coil k, through a capacitive transformer or by means of any other device for lowering the voltage, are connected

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to an external non-alternating current source, then a variable magnetic flux in the core will create at the ends of the secondary winding B an alternating electromotive force proportional to the magnitude of the magnetic flux, its frequency and the number of turns of the winding B. Cathode lamp I, the work in this case is the electronic rectifier, rectifying the variable electromotive force applied to it, will create a direct current proportional to it

, in the circuit: anode, thread, winding B and galvanometer, under which its arrow

. gal11 | 1a11 (1met) and deviates by some

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 angle.

Thu () D) s have opportunities iol it accurately

 measure the change in current in this circuit,

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. I anode of the lamp through a large adjustable "resistance E (20000-30000 Jfl)

i: connected to the battery pole of the heat, as a result of which a galvanometer is hooked, the winding L is passing some current

WITH

/. in the opposite direction to the rectified current. Self-induction resistance R should be enough f-. great not to skip ac se. The galvanometer will be under the action of two oppos. oppositely directed currents and, therefore, its deviation from the position

. -balance will be proportional to times

v. currents. i y

i Obtained with, therefore, ...:.

. 4) a surgical scheme is recommended for dl.). measurements of very fallen variables

; electromotive forces; and gives the ability to easily wear accuracy out of fi V

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When put on the heartspi; and the coil jK of the enamelled weed, which does not have a single shortly wound round, the arrow of the galvanometer does not change its position; but if there are short-circuited coils in the coil, then, due to a decrease in the electromotive force at the ends of winding B, the arrow of the galvanometer will deflect. This deviation will be the greater, the more short-circuited coils in the coil and the longer the resistance of the length of the wire wound on this coil than ueHbuie.

The subject of the patent.

A device for determining the number of icopot-closed loops in the coils of enameled wire, consisting of equipped with two windings, one fed by alternating current and the second connected to the measuring device, an iron core, on which the test coil is worn, characterized by measuring the electromotive force on a second galvanometer, connected in series with the Z cenotron, which is shunted by induction and ohmic resistance JS, connected to the current circuit Therefore, through the galvanometer circuit d, the resistance Js, the bulk battery h and the secondary winding pass the current in the direction back to the direction of the extracted current of the secondary winding K.

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to patent S.M.-Bragina No. 6723

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