SU1658305A1 - Two-step rotary transformer - Google Patents

Abstract

The invention relates to electrical engineering and can be used to create high-precision dual-count rotating transformers (DVT). The invention solves the problem of increasing the accuracy of a rough reference. DVT consists of an electromechanical part carrying the input and output windings, and an electronic part containing two adders and two subtraction circuits. One magnetic circuit carries an excitation winding, the other magnetic core is made with a number of grooves equal to twice the number of precise reference poles, and carries the output windings, made in the form of two pairs of windings, having a distribution of conductors in the magnetic grooves. Each pair of coils is connected to the inputs of one adder and one subtraction circuit, the outputs of the adders are respectively the sine and cosine outputs of the exact count, and the outputs of the subtraction circuits are respectively the outputs of a rough count 3 or

Description

The invention relates to electrical engineering, in particular, to electrical machines of automatic systems and computer technology, and can be used to create high-precision dual-count rotary transformers (DVT).

The aim of the invention is to improve the accuracy of a coarse reading of DVT.

FIG. Figure 1 shows a schematic diagram of the interconnection of a DVT element; in fig. 2 - the principle of construction of the design of the electromechanical part of the DVT; Fig. 3 is an electrical circuit of DVT windings.

The DVT consists of the electromechanical part 1 (Fig. 1) and the electronic part 2, which includes adders 3 and 4 and subtraction circuits 5 and 6. The electromechanical part consists of coaxially arranged stationary stator housing 7 (Fig. 2) carrying the magnetic core 8 and rotary housing of the rotor 9 carrying the magnetic conductor 10. On the magnetic conductors 8 and 10 of the stator and the rotor windings 11 are located. The windings of the excitation can be disposed like on a rotor and on the stator. In the described example of the implementation of DVT, the field windings are placed on the rotor, and the output windings are placed on the stator. The design of the excitation windings in the device in question can be any. There can be two quadrature windings of coarse and precise readings and there can be one general winding of excitation and coarse and exact readings (this compares the successive turn on of the windings of coarse and exact readings). The type of execution of the excitation windings (ring and drum) and the type of windings (sinusoidally distributed or concentrated or their combination) can also be any.

In the described example, the windings for both samples are made in the form of a common winding 12 (FIG. 2) located on

about

SL

00

her

about

SL

rotor magnetic core. The output windings of the DVT are made in the form of two pairs of functional ito distributed windings. The first winding 13 and the second winding 14 of the first pair have output voltages labeled U and U, respectively. The first winding 15 and the second winding 16 of the second pair have output voltages labeled L / 2 and U, respectively. Each pair of windings is connected to the inputs of one adder and one subtraction circuit, as shown in FIG. 1. The output of the adder 3, giving the sum of the voltages taken from the first and second windings of the first pair, and the output of the adder 4, giving the sum of the voltages taken from the first and second windings of the second pair, form respectively the sine and cosine outputs of the exact count. The output of subtraction circuit 5, giving the difference of voltages taken from the first and second windings of the first pair, and the output of subtraction circuit 6, giving the difference of voltages taken from the first and second windings of the second pair, form a rough reference outputs.

The distribution of conductors in the grooves of the DVT magnetic circuit is defined by the following expressions:

/ Vml - (-)

L /, | v1 (-1) +

+ (-1)

l + 1

2n., Sm-g-t

The adders and subtraction circuits, combined with the design of the output windings, have a higher accuracy in reproducing the voltages at the coarse reference output and ensure the performance of the DVT at any reduction (number of pole pairs) of the exact reference. Compared with other analogues, the proposed design releases a significant portion of the space in the magnetic cores from the output windings, which results in an increase in the energy parameters of the DVT and a decrease in the accuracy of the exact reading.

Claims (1)

Invention Formula five A two-count rotating transformer containing a magnetic core with a number of slots equal to 4p, where p is the number of pairs of precision reference poles carrying output windings using common sections for 0 exact and coarse readings, characterized in that, in order to improve the accuracy of the coarse counting, two adders and two subtraction circuits, the output windings are made in the form of two pairs of windings, having a distribution of conductors in the grooves of the magnetic circuit by the expressions: for the first pair of windings - (-) five ( - / -) + for the second pair of windings Na N -1) T + + (-1G + Where P -  t z - - winding number in pair; i - numbers of grooves of the main; ., i and Л, 2 - the number of conductors in the; -th slot of the p-th winding, respectively, of the first and second pairs of output windings; the maximum number of conductors of one pair of windings in the groove of the magnetic circuit; the number of grooves of the magnetic circuit carrying the output windings. DVT works as follows. When an alternating current excitation voltage is applied to the winding 12, depending on the angular position of the DVT rotor, the outputs of the adders 3 and 4 produce voltages proportional to sinpa and cospa respectively, and the outputs of the power supply circuits 5 and 6 are proportional to sina and cosa. DVT in contrast to the prototype by introducing + (-) l + l . 2l. Sin-i for the second pair of windings - h (-.) H + (-P + aA-, Where 0 L ,, five p is the number of the winding in the pair; / - numbers of the magnetic grooves; Nt2 - the number of conductors in the r-groove of the pn windings, respectively, of the first and second pairs of output windings; the maximum number of conductors of one pair of windings in the groove of the magnetic circuit; the number of grooves of the magnetic conductor carrying the output windings, each pair of windings is connected to the inputs of one adder and one subtraction circuit, the outputs of the adders are respectively the sine and cosine outputs of the exact count, and the outputs of the subtraction sorts are respectively the sine and cosine coarse outputs. Na z - 2 U Fig.Z