SU855882A1 - Rotary transformer - Google Patents

Description

one

The invention relates to automatic control and regulation systems, in particular, to electrical elements such as a rotating pressure transformer.

Known rotary transformer containing on the rotor and stator of two quadrature zigzag windings p j.

The disadvantages of this device are the low accuracy of operation when connected to their output windings of the load and including them in cascade circuits, as well as the need for balancing windings to improve accuracy.

The closest to the invention to the technical essence and the achieved result is an eruptive transformer comprising rotor and stator magnetic cores carrying center-division sinusoidally distributed quadrature windings 2.

The disadvantage of this device is low accuracy.

when loading on the load, which is partially compensated by the implementation of the primary balancing, i.e. connecting to its quadrature winding reactive and active resistances. When using a transformer in the vector construction mode, when both excitation windings are powered from different electrical circuits, accurate balancing is not possible. This leads to a loss of accuracy. In addition, depending on the accuracy of the primary balancing when changing the angle of rotation of the rotor, the output resistances of the windings of this rotating transformer change, which also leads to a loss of accuracy when working on the load or in circuits that require stability of the parameters of the windings (for example, phase shifters)

Claims (2)

The purpose of the invention is to increase accuracy when working B cascade chains x 3 k when working on a load, eliminating symmetry and ensuring stability of parameters and accuracy. When working on a load without turning on gauging devices, this goal is achieved by using a quadrature winding excitement of two identical pairs a / was going to but of the disconnected sections, the axes of which are shifted among themselves by 90 el. The drawing shows a principle electrical circuit of a rotating transformer. The power transformer consists of two rotors of the rotor and a stator of Kasuishch with two quadrature windings Ki each. Two magnetic coils, for example, a stator, are equipped with two quadrature windings and 2 excitations, which are labeled with the corresponding values. Winding 1 consists of parallel sections 3 and 45 whose axes are mutually shifted by 90 el. The winding: 2 consists of sections 5 and 6 which are parallely included, the axes of which are also opposite:: -. All four sections of the windings 3-6 are the same, the axes of the sections of the windings 3 and 5, 4 and b of the park are the same. The polarity of mutual switching between windings 3 and 4 is anti-polar to the mutual inclusion: r1.h of windings 5 and 6, which excludes nojiyueHHe of mutual displacement of the axes of the current and 2 by 90 zl.grad. On the magnetic conductor of the rotor there are two quadrature transverse windings 7 and 8, the outputs of which are. are designated respectively C 2 (sine winding) and K, K (cosine winding). The device works as follows. When applied to a winding, B V. 7: -. An alternating current, the current of the section of coil 3 induces a magnetic flux, which is created in the output winding of C .; C 2 is proportional to sinews and in the output winding, a voltage proportional to cosdl ,. where 0 is the angle of rotation of the rotor in electric degrees, measured from position 5 at which the mutual induction of the windings and the section of the winding 3 is equal to zero. At the same time, the current of the winding section 4 creates in the winding CjjC a voltage proportional to 5In (cA. + 90), and in the winding KK, the voltage is cos (). Thus, the total voltage from the entire winding 1 on the winding is proportional to sind. + Sin (of + 90 °) yf sin (CO-45 °), (l) and on the winding K K, cosc (+ cos (i + 90) -V5 cos (). (2) When power is applied to the winding B, B, the current of the winding section 5 induces in the windings CjC and accordingly voltage proportional to slnd-H cos ai- The current of the winding section 6 induces in the windings and accordingly voltage , proportional to Hbie sin (d-90 °) cos (oi-90 °).). Signs - in these expressions due to the fact that the polarity of the connection of the winding section 6 relative to the winding section 5 is opposite to that when the winding sections 3 and 4 are mutually switched. Thus, the total voltage from the entire winding 2 is induced on the winding .nual sinct "-5in (c -90) - / 2 sin {of-45 °). (3) and on the co5d + cos winding (o (-90) -tT cos (Qf-45). (C From the expressions () - (4) it can be seen that the device, when powered from any of the excitation windings, and 2 solves the problem sine - cosine transform, i.e., the same task as a conventional four-winding sine-cosine rotating transformer when the origin of the angles is shifted by 45 degrees.Performing each of the excitation circuits in the form of two parallel inclusive windings shifted in position by 90 electrical compensation creates compensation for both the longitudinal and transverse components of the magnetic flux The load in the circuit of one of the output windings or the presence of asymmetrical loads in each output winding and resulting in reduced accuracy of the rotating transformer, since the demagnetizing effect of each of these magnetic flux components is compensated by an increase in the excitation current in the corresponding parallel branch of the excitation winding. on the value of the output resistance of the source supplying this winding, primary balancing, which leads to the constancy of the output resistance Single Doi output windings independently of the angular position of the rotor. This eliminates the errors of the transformer from the transformer from the connection of the loads. At the same time, it is not necessary to change the active and reactive symmetric β-resistances externally activated by symmetrization. Claims of the invention A rotating transformer containing rotor and stator magnetic cores carrying two quadrature windings, one of which has an excitation winding, and the other has an output winding, characterized in that, in order to improve accuracy, each of the quadrature excitation windings consists of two parallel sections, the axes of which are displaced among themselves by 90 el. Sources of information taken into account in the examination Sources of information taken into account during the examination. USSR Author's Certificate No. 230931, cl. H 01 F 40/0, 1966. 2. Khrushchev V.V. Electric micromachines. M.-L., Energie, 1969, p. 77-128.