SU1690108A1 - Sine-cosine rotary transformer - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to increase the accuracy of use of a rotating transformer in devices where there is a connection between the output windings between them. In a sine-cosine rotary transformer containing magnetic cores with field windings and non-uniformly distributed quadrature windings of the ring type, arranged in an even number of grooves, the number of conductors in the working grooves of the magnetic core, respectively, of the sinus Nci and cosine NKI output windings are: Nci {1/2 - -1 / 2 (-1) NmSln ai + (I - 1) 2 lr / z, NKi - 1/2 - -1/2 (-1) NmCOs ai + (I - 1) 2 lr / z, where i is the slot number , d is the angle between the origin of the angles on the bore of the magnetic core and the axis of symmetry of the first groove, p is the number of pairs of numbers, z is the number of slots m an assembly line carrying output windings, Nm is the maximum number of winding conductors in a groove. The indicated distribution of quadrature windings leads to a decrease in the capacitance between them and to an increase in the accuracy of use of the transformer. 1 hp f-ly, 3 silt, (L S

Description

The invention relates to electrical engineering and can be used to create high-precision electrical information machines.

The purpose of the invention is to improve the accuracy of using a rotating transformer (VT) in devices where there is a connection between the output windings between them.

FIG. Figure 1 shows the BT construction; in fig. 2 - electrical circuit in principle; in fig. 3 - scheme of using the VT in the phase shifter mode.

W consists of coaxially located stationary stator housing 1 (Fig. 1) carrying the magnetic core 2, and rotary housing 3 of the rotor carrying the magnetic core

4. On the magnetic cores 2 and 4 of the stator and the rotor windings are placed 5. One magnetic core (in the considered example of the rotor) bears on itself one or two excitation windings, the second (in the considered example of the stator) carries on itself two output windings.

Winding can have one pair of poles (bipolar VT), and more than one pair of poles (multipolar VT).

The rotor magnetic core 4 may have

any number of slots and carry any type

. (both drum and ring) windings

5. The magnetic field 2 of the stator must have a clear number of working slots and carry the output windings 5 of the ring type, the magnetic circuit 2 of the stator (since it carries the windings of the ring type) must have grooves as

ABOUT

oh oh

about

00

the side of the surface facing the magnetically conductor 4 of the rotor (working grooves) and the side facing the stator housing 1 (technological grooves).

On the rotor there are two quadrature windings b and 7 of excitation (Fig. 2), the conclusions of which are marked BiB2 and 8384. On the stator there are two quadrature output windings - sissus 8 and cosine 9, the conclusions of which are marked respectively CiC2 and KiKa.

In contrast to the known transformer, the output windings are distributed in the grooves of the magnetic circuit so that the numbers of the conductors of the sinus winding in the slots of the magnetic circuit are equal

Nci | - (1) NmSln 01+

+ (I

-1) .23B,

(D

and the number of conductors of the cosine winding in the slots of the magnetic circuit is equal to

NKI - - H JNmCost "1 +

0-1)

. 2 lr

z

.

(2)

where Nci, NK | - the number of conductors in the lth slot of the magnetic circuit, respectively, of the sinus and cosine windings;

I - slot number;

“1 is the angle between the origin of the angles on the bore of the magnetic core and the axis of symmetry of the first groove;

p is the number of pairs of poles;

z is the number of working slots of the magnetic circuit carrying the output windings;

Mm - the maximum number of conductors in the winding groove.

The VT can be used in the phase shifter mode (FIG. 3), while the RC-chain from the capacitor 10 and the resistor 11 is connected to the terminals. The connection of the output windings is indicated by the letter O.

The transformer works as follows.

When AC voltage is applied to the winding b and depending on the angular position of the rotor a, a voltage proportional to sinp a is induced on the sinus output winding 8, and a voltage proportional to cos a is induced on the cosine output winding 9.

When voltage is applied to the winding 7, the output windings 8 and 9 will respectively induce voltages proportional to sinp (a + 90 °) ncosp (a + 90 °).

This distribution of output windings when cosine and sine windings

placed in different grooves, provides virtually no capacitance between them, so when using such a CW with a closure between each other on one of the outputs of the output windings does not cause an additional current flowing through the windings through the interwinding capacitance and the connection point of the leads. Consequently, from the connection of the windings, there is no further reduction

precision VT, which is inherent in the famous transformer.

Claims (2)

1. A sine-cosine rotary transformer containing one magnetic conductor carrying the excitation windings and another magnetic circuit with an even number of grooves carrying unevenly distributed quadrature type output windings of the ring type, which is designed to improve accuracy when used in devices where there is a connection of the output windings to each other, the number of conductors in the working grooves of the magnetic circuit, respectively, of the sinus and cosine output windings are equal 35 (-1) NmSln ai + + (1-1) 2 r , 40 (-1) H 1 NmCOS ai + + 0: D Z & l where Ncf and NKI are the number of conductors in the lth slot of the magnetic circuit, respectively, of the sine and cosine windings; I - slot number; SC is the angle between the origin of the angles on the bore of the magnetic core and the axis of symmetry of the first groove; p is the number of pairs of poles; z is the number of working slots of the magnetic circuit carrying the output windings; Nm - the maximum number of conductors in the winding groove. 2. Transformer according to claim 1, characterized in that the angle b is determined by the expression oO% / 4- - P / z I J Phi.1 eight / / / 01 / 9.1 Fig.Z