SU1495914A1 - Armature combined winding - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to expand the field of application by winding 63 grooves, as well as improving the parameters by increasing the winding factors for each pole. The winding is made of twelve distributed coil groups with two-layer concentric coils and is connected in two parallel three-phase stars with three-phase clamps for polarity P ₁ = 2 and additional single-phase clamps for polarity P ₂ = 6 from their zero points. The first phase contains the first, fourth, seventh, tenth coil groups, their coils are connected in series to the branches of the stars and to the additional branch, the beginning of which forms the phase clamp, and its end is connected to the beginnings of the branches of the stars of the phase. The coils of the even coil groups are included in the branches opposite to the odd, and for the other two phases, the numbers of the coil groups alternate over the first phase with intervals of four and eight groups. The winding is made in 63 grooves, the second, the pole and the tenth coil groups each contain six coils with dampers in the slots JI = 17-2 (I-1), and the remaining coil groups in five coils with JI = 16-2 (K -1), where I = 1-6 and K = 1-5 are the numbers of coils in the catholic groups. In the branches of each phase, for its coil groups, the coils with the numbers K = 1 are included in the branch of the first star, K = 5 and I = 6 in the branch of the second star, and the remaining coils in the additional branch. 5 il. 1 tab.

Description

The invention relates to coils of alternating-current AC electric machines with two polarized magnetic fields in a common magnetic conductor and can be used, for example, in synchronous machines with an excitation system from a third harmonic magnetic field, in single-machine frequency and number phase converters. et al. The purpose of the invention is to expand the field of application by winding in 63 slots, as well as improving the electromagnetic parameters by increasing the winding coefficients.

FIG. 1 shows the scheme of the proposed winding; FIG. 2 is a simplified wiring diagram of its phase C1; in fig. 3 and 4 - shift diagrams

3149

the axes of the coil groups for the polarity p 2 and p 6, respectively; FIG. 5 shows the polygon of the AA winding for polarity p 2,

The winding (fig. 1) is made double-layered in 63 slots with numbers from 1 | Up to 63 of twelve jrpynn coils (with numbers from 1Г to 12Г) with concentric coils with steps

10 grooves y 17-2 (1-1) 17, 15, 13 11, 9, 7 for groups 2G, 6G, SOUTH and y 16-2 (k-1) 16, 14, 12, 10, 8 p other groups, where i 1-6 and

 1–5 are the numbers of coils in six to 1 n ticking groups. It connects two parallel three-phase drives with three-phase terminals C1, 12, Sz for p 2 and additional (single-phase clamps 01-02 for p 6 of their zero points. Phase 1 contains groups 1G, 4G, 7G, SOH and their " Atushki included in series

branches of stars and an additional ETT, the beginning of which forms a clip) of the basics and its end is connected to the beginnings of the Zetway of the stars of the phases (FIG. 2): coil “with numbers k 1 - to the branch of the first entry, with numbers

0

five

in the branch, the second star, with the numbers k 2, 3, 4 and i 1, 2, 3, 4, 5 - in the additional branch. The coils of even groups are included in the branches x are relatively odd. For the other two phases, the group numbers alternate with respect to the first phase at intervals of four and eight groups. The axes of adjacent coil groups are shifted by angles (in electrical degrees) o (for p 1 2 (Fig. 3; of 15 ° / 5.25) and 180 ° ± 3 s for t (Fig. 4), their vectors form a three-phase symmetric a system for p 2 and a single-phase system with three branches for p 6. In Fig. 1, the upper row of arrows shows the directions of the three-phase current when the winding is fed through C1, C2, C3 (p 2), and the lower row is the voltage of a single phase current when power winding through 01-02 (p 6).

The EMF of the coils is proportional to their coefficients of shortening K at sin (1G.up / 15.75) and Ku # sint JT, 25), where 63/4 15,75 and 63/12 5.25 are pole divisions. The data are given in the table.

The emf of the phase branches (fig. 2) for 1C 2 (fig. 3) is equal to: branches C1 -01 - 0.9997 (1 + 2cosoOwj 2.9966W (, branches C1 -02 - 0.7159 (1 + 2cosoO +0, 2.7887w., I.e. they are practically the same and their average value is 2.8927w; branches C1-C1 - (0.9848 + 0.9309 4- 0.840) (1 + 2cosoO + 0.9922 + 0.9972 4- 0.9626 + 0.8899 + 0.7818jcw, f

55

12.8839cwj; The phase EMF is equal to (12.8839-с + + 2.8927) .W | j with the number of turns in the phase equal to (14 s + 3.5) w ,, and then for c 1.0 get an emf of phase equal to 15 , 7766wj, and the winding coefficient is Ko8-, 15.7766 / 17.5 0.9015. The CL emf phase is smaller by - / 3 times get (12.8839.c + 2.8927) 15.7766 / Uz, from where it is found from 0.48 and К pjr

51

 9.077 / 10.22 0.8882; with 0.5, Kpg 0.8890 is obtained.

The EMF of the chain 01-02 for the polarity of P2 6 does not depend on the coefficient c and is equal to (0.9972 + 0.6802) (1 + 2 CONZ + 0.8660 wj 5.8607.Wj with the number of turns of this circuit 7w., And is equal to g 5,8607 / 7 0.8372 ..

When the coefficient changes from inversely proportional to it, the cross section of the wire of the coils of the additional branches of the phases should be changed, as a result of which the filling factor of copper remains the same for all the slots. The coefficient c may have other values.

Thus, the proposed winding has electromagnetically independent opposite pole clamps (the field with p 2 does not induce an emf at the clamps. 01-02, and the field with p 6 does not induce the emf at the linear clamps C1, C2, C3). Compared to windings made

in 39 grooves with K 6-0.90 and KOG 0.70, it has an extended range of application, since it is performed in 63 grooves, as well as higher values

winding coefficients.

FIG. 5 numbers from 1 to 63 indicate the slot points of the MDS polygon and used its construction to use an auxiliary triangular grid, the side of which depicts the phase zone current vector of one slot layer and is taken for two units of length (phase zone current vectors are shown in the center of Fig. 5) like AZBXCY). By the VDS polygon (at c 1.0), the following is determined: the square of the average radius of the slot points — at 1 320/63; square of the radius of the circle corresponding to the main harmonic EF with a winding coefficient K (g 0.9015, - Rj

 (|| o.9015- ||) 2 226,96052, where

(14-2 + 7) 3/63 105/63 - the average value of the groove current (in each phase 14. coils, in addition, branches flow around twice as much current as the other 7 coils of star branches); differential scattering coefficient characterizing the percentage of higher and lower harmonic winding MDS, do

 R / R - 1) -100 1.549%. With

0

five

20 25

-zp

, „

35

0

five

146

0.5 is determined in the same way: R 5037/63; Rj ||. 0.8890)

 79.455669 and nd 0.6251%. Thus, the proposed winding has the best indicators on the quality of the MDS curve as compared with the known winding, since for it the coefficients ba are much smaller. This circumstance leads to an improvement in the sine curve of the output voltage curve of a generator with such a winding.

The proposed winding can be applied on the bark of synchronous machines (up to 100 kW) with the excitation system from the third harmonic field and replaces the two-separate main windings of the serial machine: a three-phase main with pole p, 2 and an additional single-phase with pole P2 6, connected through the excitation control unit with valves to the excitation winding of the rotor. The use of such a winding in generators leads to a simplification of the design of machines and its manufacture, a reduction in copper consumption and insulation on the core, an improvement in the electromagnetic parameters and an increase in the operational reliability of the machine. The simplification of manufacturing the combined winding of the winding winding coils is continuous; the phases on the template are continuously wound, which leads to a decrease in the number of pelvic joints.

Claims (1)

Invention Formula The combined root winding, for example for a synchronous machine with an excitation system from the third Harmonic magnetic field, is made of twelve coil groups with numbers from 1G to 12G, made of two-layer, concentric coils, the coils are connected into two parallel three-phase stars and three additional branches, the end of each additional branch is connected to the junction point of the star phases of the same name, the conclusions are made from the zero points of the stars and the beginnings of additional branches, with the coils of even groups included in the branches X is opposite to the coils of odd groups, and the numbers of the groups of phases alternate relative to the groups in G 9 D) FG Jtr , 35 3f Fie.b