SU1292052A1 - Device for converting d.c.to variable electromotive force - Google Patents

Abstract

The invention relates to electrical engineering and can be used as an element of automation, in particular, the conversion of direct current into a variable emf. The purpose of the invention is to improve the accuracy and increase the sensitivity of the device when converting a direct current into an emf variable. The device contains a magnetic system, made in the form of two C-shaped, parallel to the 5nep sections 1 and 2, interconnected by two ferromagnetic elements 3 and 4, which in turn are connected by a ferromagnetic detachable jumper 5. In each C-shaped section of the magnetic conductor from the end along its length, a through hole is made with the formation of two C-shaped rods on which the modulating windings 6–9 are placed. The ferromagnetic connecting elements 3 and 4 and the jumper 5 are made with through holes in length, through which the modulating windings 10-12 are passed. On the ferromagnetic connecting elements 3 and 4 are located the output windings 14 and 15. The conductor 13 is covered with C-shaped sections Qi 1 and 2. The presence of a removable jumper and the location of the output windings on the left and right side of the jumper provides mutual compensation of signals induced in output windings, which leads to an increase in the sensitivity and accuracy of this device. 1 il. C. 8. II. (About ffO1 l4D; j 7

Description

The invention relates to electrical engineering and can be used as an element of automation, in particular, in the conversion of direct current into an emf variable.

The aim of the invention is to improve the accuracy and increase the sensitivity of the device when converting a direct current into a variable ED

The drawing shows a structural diagram of the proposed device.

The device consists of a magnetic system made of two C-shaped parallel sections 1 and 2 interconnected by ferromagnetic elements 3 and 4, and in turn these ferromagnetic elements are provided with a removable ferromagnetic jumper 5, and in each C-shaped section with the end of the length of the through hole with the formation of two C-shaped rods, which are wound modulating windings 6 and 7, 8 and 9 and they are interconnected so that in the presence of a modulating current created magnetic fluxes are Only for modulating the magnetic resistances of the C-shaped sections of the magnetic circuits, and the ferromagnetic connecting elements and their jumpers are made with through-holes in length, through which the modulating windings 10-12 and are passed. they are interconnected in such a way that the flows created by the ampere turns of these windings serve only to modulate the magnetic resistances of the ferromagnetic connecting elements and their removable jumpers. The device also consists of a current lead 13, enclosed by C-shaped magnetic conductors, and output windings 14 and 15, located on one of the ferromagnetic connecting elements on the right and on the left side of the ferro-magnetic jumper, as shown in the drawing.

The principle of operation of the proposed device is as follows. When the modulating windings 6-12 are connected to an alternating current source in the magnetic system of the device, magnetic fluxes are created that serve only to modulate the magnetic resistances of the magnetic circuit of the magnetic system of the device and in the absence of convertible current in the conductor 13 at the output of the output windings 14

and 15 induced output emf

E. - equal to zero even with

v (x external magnetic fields because

the output windings 14 and 15 with respect to the external magnetic field are interconnected in series with each other and the induced EMF induced on the output windings are mutually compensated,

JO If the conductive current I ,, is passed through the conductor 13, then in C-shaped magnetic cores 1 and 2 magnetic fluxes F and F are created, equal in magnitude and closing the circuit through ferromagnetic connecting elements 3 and 4 and removable

/

jumper 5, and their direction in jumper 5 is the same.

Under the action of these fluxes Fd and F in the output windings, an emf e gjji is induced, which, taking into account the fact that Φ F Ф F and Wgj, | ,,;,, Wj ,,, - Wgj ,,, is expressed as

d P

OUT V1 (®OUT. dt

If we assume that the number of turns of the conductor W, (equal to unity () and the cross section of the magnetic cores along the entire path of the flows Fd and Fr, is the same, then expression (1) can be rewritten as follows:

ee. 2 W

out

with t. 4dt

where | Uo- magnetic ja nna j

1 is the path length of the magnetic flux F;

 cross section of the magnetic conductor of the flow path F;

p is the static magnetic permeability of the magnetic circuit, which is determined from the approximation formula for the f (H) curve.

From defined W (2) the effective value of the output voltage of the main harmonic

E, „Сl oScтCW. O) where is the coefficient defined by

modulating magnetic inductions and voltages for the considered device “0.45.

From (3) it can be seen that the output EMF is linearly related to the converted currents 1) (i.e., static characteristic 31122052

The tick of the device under consideration is linear,. because sensitivity

" ten

S ,, Г W6 ,,, u, .e is constant over the whole range of transformed-current 1. Given this expression, formula (3) can be rewritten as:

, W If it is required to double the sensitivity of the device, then the second ferromagnetic coupling element 3 is also supplied with two output windings, connected between themselves in a series-consistent manner. In this case, the total output emf is written in the form

ESMX 2 SI. (5) From (5) it can be seen that with an increase in the sensitivity twice as much, the total output emf also doubles.

From expressions (3) - (5) it can be seen that the proposed device can be successfully used to convert

20

Making a ferromagnetic plug-j removable allows you to convert DC current into an emf variable without breaking current-carrying parts, which saves time when switching from one limit of converting the DC current into an emf variable to another.

All the listed advantages of the races expand the field of application of the proposed device in a plant with various currents, in particular, for converting direct current into alternating voltage emf convenient for further processing, as well as a primary sensor for automatic control and regulation of direct currents.

The introduction of the invention, which has a higher accuracy and sensitivity than the well-known device, leads to an increase in the quality of the products produced and a single scrap, which in general leads to a definite 7 seconds

small and medium values of a constant economic effect.

current to variable emf having linear

and invention

F o rm y

A device for converting

static characteristic.

The technical and economic advantage of the invention as compared with the known device is a large precision current into the variable voltage, a low and low threshold of sensitivity holding the conductor passing through the work due to the modulation of the entire magnetic field. , made in the form of a magnetic conductor of the magnetic system and due to two C-arms parallel to the location of the use of a ferromagnetic, removable, loose section, connected between the terminals, which reduces to zero 35 bout with two ferromagnetic elements, the air gaps on the path permanent one of which two are located

magnetic fluxes.

The supply of the device with a removable jumper and the location of the output windings on the left and on the right side of the jumper ensures mutual compensation of signals induced in the output. windings under the influence of external magnetic fields. Which leads to an increase in the sensitivity and accuracy of this device.

Manufacturing magnetic cores of the magnetic system of the device with modulating windings and supplying the connecting ferromagnetic elements with removable ferromagnetic jumpers

simultaneously with an increase in sensitivity and accuracy, it ensures the repeatability of the static characteristic of the device from sample to sample. 55 with them.

VNIIPI Order 277/51 Circulation 6.99

Subscription

Random polygons pr-tie, Uzhgorod, st. Project, 4

ten

-

I

20

Making a ferromagnetic plug-j removable allows you to convert DC current into an emf variable without breaking current-carrying parts, which saves time when switching from one limit of converting the DC current into an emf variable to another.

All the listed advantages expand the field of application of the proposed device in a plant with various currents, in particular, for converting direct current into alternating voltage, suitable for further processing, as well as a primary sensor for automatic control and regulation of direct currents.

The introduction of the invention, which has a higher accuracy and sensitivity than the well-known device, leads to an increase in the quality of the products produced and a single scrap, which in general leads to a definite 7 seconds

and invention

F o rm y

A device for converting

This is the current in the alternating voltage EMF containing the current lead passing through the magnetic conductor, made in the form of two C-shaped parallel sections, connected between each other by two ferromagnetic elements, on one of which two

output windings connected in series according to modulating windings, characterized in that.

that, in order to increase the accuracy and increase the sensitivity, it is equipped with a ferromagnetic detachable jumper, in each C-shaped section of the magnetic conductor from the end along its length

a through hole with the formation of two C-shaped rods, on which one modulating windings are placed; ferromagnetic connected elements and re-shchka made with a through-p

openings on the side through which other modulating windings pass through, a removable ferromagnetic jumper is installed in the middle between the ferromagnetic elements and connected

Subscription

Claims (1)

Claim A device for converting direct current to alternating EMF, containing a current path passing through a magnetic circuit, made in the form of two C-shaped parallel sections, interconnected by two ferromagnetic elements, on one of which are two output windings connected in series according to modulating windings , characterized in that, in order to increase accuracy and increase sensitivity, it is equipped with a ferromagnetic removable · jumper, in each C-shaped section of the magnetic circuit with ca along the length of the through hole 45 formed to form two C-shaped bars, on which one modulating coil are located; ' ferromagnetic connected elements and a jumper are made with through holes along the length through which other modulating windings are passed, a removable ferromagnetic jumper is installed in the middle between two ferromagnetic elements and connected to them. VNIIIPI Order 277/51 Circulation 699 _________ Subscription Custom polygr. ave, city of Uzhhorod, st. Project, 4