SU1141516A1 - Three-phase - one-phase combined stator winding - Google Patents

Abstract

1. THREE-PHASE-ONE-PHASE COMBINED STATOR WINDING with pole pair numbers PI / Pj 1/6, made two-layer in twenty-four slots from six distributed coil groups with concentric coils and connected into two parallel three-phase stars, the beginnings of which form three-phase clamps for polarity p, and their zero points are two additional clamps for polarity p, characterized in that, in order to increase the use of copper and improve the parameters for polarity p and PJ, in each coil group containing four coils and with groove steps at 12–2 (k-1), coils numbered 1 and 3 are connected in a consistent manner and form the first subgroup, coil p numbered k 2 forms the second subgroup, coil numbered 4 forms the third subgroup, In the first phase, the first star includes the first and second subgroups of the first coil group and the third subgroup of the fourth coil group; in the first phase, the first and second subgroups of the fourth coil group and the third subgroup of the first coil group, o. the subgroups of the fourth coil group are included opposite to the subgroups of the first coil group, the end of the first subgroup of the first coil group and the beginning of the first subgroup of the fourth coil group are connected together, and the other phases are the same as the first phase and the numbers of their first coil groups SP phases with an interval of two groups for the second phase and four groups for O) of the third phase, where 1-4 is the number of the coil in the coil group. 2. Winding according to claim 1, of which is the number of turns of the coils numbered 1, 2, 3, 4, in each coil group are 2: 3: 2: 1 .

Description

1 The invention relates to windings of variable voltage electric machines and can be applied, for example, in single-machine converters of frequency and number of phases. Combined electric windings are known, made in the form of parallel branches for one pole of the p, each of which contains distributed coils and has outputs of middle points for the clamps of the phases of the other polarity of p. The angle between the axes of the branch coils is 2 l / (radians, and the number of turns of the coils is proportional to the angle of their shift relative to the axis of the branch Cl3. The disadvantages of such windings are the complexity of design and manufacture, large losses from equal currents in the branches x. Closest to the invention according to the technical entity is a three-phase winding with the number of pairs of poles Р / РЗ 1/6, made of six distributed coil groups connected in phases into two parallel branches, the top of which form three-phase clamps for polarity p, and their ends connected in two additional clamps for polarity PJ. The winding can be made from single-layer or double-layer C2 equal-step or concentric coils. A disadvantage of the known winding is the low winding coefficient for polarity pj, which degrades the winding parameters. copper and improvement of the parameters for polarity PI and RE by performing windings with differently concentric coils in the form of negative windings. This goal is achieved by the fact that in a three-phase-single-phase combined stator winding with the numbers of pole pairs 1/6; made in two-layer in twenty-four, grooves from W, there are distributed Katushek groups with concentric coils and connected, in two parallel three-phase stars, the beginnings of which form three-phase clamps for polarity p, and their zero points are two additional clamps for polarity of RZ, in each coil group containing four coils 62 with steps along grooves 12-2 (k-1), coils numbered k 1 and 3 are connected in series in accordance with and form the first subgroup, coil numbered 2 forms the second subgroup, coil c number to 4 forms the third subgroup, in the first phase the first and second subgroups of the coil group of the first and third subgroups of the coil group of the fourth are connected in series, in the first phase the first and second subgroups of the coil group of the fourth and third subgroups of the coil group of the first, in the first phase, moreover, the subgroups of the fourth coil group are included in opposition to the subgroups of the first coil group, the end of the first subgroup of the first coil group and the beginning of the first subgroup of the coil Fourth group are connected together, and other phases are made in the same way as the first phase and the numbers of their coil groups alternate relative to the first phase groups with an interval of two groups for the second phase and four groups for the third phase, where .1-4 - Coil number in the coil group. The numbers of turns of the coils numbered 1, 2, 3, 4 in each coil group are 21 3: 2: 1. FIG. 1 shows the unfolded; a circuit of a combined winding with p / p 1/6, made by limestone; in fig. 2 - scheme of the proposed winding; in fig. 3 and 4 - alternation of the phase zones of the proposed winding with equal-turn (Fig. 3) and different-turn (Fig. 4) coils; in fig. 5 VAT polygons windings of FIG. 1 and 2; in fig. 6 is a diagram of the ZDS of the proposed winding for polarity p 1. The winding (FIGS. 1 and 2) is made in twenty-four slots from six distributed coil groups with concentric coils (with numbers from 1 to 6). The groups are connected in two parallel three-phase stars, the beginnings of which are: three-phase clips Cl, C2, C3 form, for the polarity PJ 15 and their zero points are two additional terminals 01 and 02 for the polarity pj 6. In the winding of FIG. 1 performed in a known manner, single-layer equal turn coils have steps for

3ll / i

grooves y 11 and 9 (middle step y, 10). In the C1 phase, the first star includes the first group, and the second star - the fourth included group is counter. The numbers of groups of other phases alternate with respect to the groups of the first phase with an interval of two groups for phase C2 and four groups for phase C3. The winding coefficients of such a winding are: for polarity p, 1. oS-1 0.9577; for polarity p 6Kab4 0.707.

In the proposed winding (Fig. 2), the double-layer coils have groove steps of 12-2 (k-1) 12, 10, 8, 6, where to 1-4 is the coil number in the group The coils of each coil group are divided into three subgroups: the coils numbered 1 and 3 are connected in series in accordance with and form the first subgroup5; the coil numbered k 2 forms the second subgroup; the coil numbered 4 forms the third subgroup. In the Pevon Phase C1, the first and second subgroups of the first coil group and the third subgroup of the fourth coil group are connected in series to the first star; in the first phase, the first and second subgroups of the fourth coil group and the third subgroup of first coil group are included in the second phase, and the subgroups of the first coil the fourth group is included counter to the subgroups of the first coil group, the end of the first subgroup of the first coil group to the beginning of the first subgroup of the fourth coil group is connected together. The other two phases C2 and Sz are made the same as the phase C1 and the numbers of their coil groups alternate with respect to the groups of phase C1 with an interval of two groups for the phase C2 (groups with numbers 3 and -6) and four groups for the phase Sz (groups with numbers 5 and -2).

The upper row of arrows in FIG. 1 and 2 shows the directions of the currents during the supply of the winding through the clips C1, C2, Sz with a three-phase current (p 1), and the lower pW with the winding through the clips 01 and 02 with a single-phase current (p, 6). An alternating field with a polarity of p 1 at additional terminals 01 and 02 does not induce an emf ..

For the proposed winding of each coil group, there are shortening factors: for polarity

64

p, 1 - K ,,, 1,0; 0.9659; 0.866; 0.707; for polarity p 6 - K, 0; 1.0; 0; -1.0. The winding ratios of the winding of FIG. 2 are equal: with equal-turn coils (Fig. 3) - V.ST (1.0 + 0.9659 + 0.866 + 0.707) 4 0.8848 (middle step at 9), 1.0; with the number of turns of the coils in the ratio: 2: 3: 2: 1 - K, (2 1.0 + 3 0.9659+ + 2 0.866 + 0.707) 8 0.9171 (average pitch 9.5), 1.0. All grooves in the winding have the same number of turns.

Thus, in the proposed winding, the use of copper is higher than in the known one 10 (0.8848 1.0):: (0.9577 0.707) 9 1.45 times for,. equal winding winding and 10 (0.9171 1.0): (0.9577 0.707) 9.5 1.43 times with different-turn coils. Since half of the coils are removed from the circuit for the PJ 6 polarity (between terminals 01 and 02), the winding parameters for the PJ polarity are improved; noBbmia winding coefficient, copper losses are halved.

In the EMF diagram (FIG. 6), constructed for the polarity p 1 of the winding of FIG. 2, the EMF vectors of the first subgroups are assigned the number of the coil group, and the EMF vectors of the second and third subgroups are assigned the group number with a stroke and with two strokes.

FIG. 5, using an auxiliary triangular grid, we construct polygons MDS Sz 1 for the pole position p 1 of the winding of FIG. 1. (outer polygon "), the windings of FIG. 2 with isometric turns (FIG. 3) coils (internal 12-gon,), the windings of FIG. 2 with coils of different turns (FIG. 4) (24-gon coils). In the center of FIG. 5 shows the vectors of the phase zones (Fig. 3 and 4) A-Z-B-X-C-Y. The calculation of FIG. 5, the radii of the slot points of the polygons relative to the center, we obtain (the side of the grid is taken as two units) the values of the average radius for FIG. 5a - RJi 216; for figs. 184; for figs. 5c - R 197.5. The radius of the circle corresponding to the fundamental harmonic of the MDS (p 1) is G3 R2 / 4-4 Kob1 / equal to: for FIG. 5a is R2 214.0945; for FIG. 56R2, 182.7565; for FIG. 5c - R 196.3519. Using the values and R, we calculate the differential scattering coefficient of the winding 3 (;;

-t () - 1 100%: for the winding in FIG. 1-6, 0.889%, for the proposed winding (FIG. 2), equal-turn -6 e 0.679% and non-turn-wise 0.583%. .

Thus, the proposed winding as compared to the known one has a lower content of higher harmonics in the VAT curve for polarity P, 1 0.889: 0.679 1.31 times with ramps and 0.889: 0.583 1.53 times with coils of different turns,

In comparison with the known winding, the proposed winding has the best parameters for the polarity of p and Pj, as well as the best use of copper.

l

1. G. .T. .. .one.

Fyg. J

.one. .with. .i. .u .one. . FIG L

Claims (2)

1. THREE-PHASE-SINGLE-PHASE COMBINED STATOR WINDING with the numbers of pole pairs p ₇ / p ₂ = 1/6, made double-layer in twenty-four grooves from six distributed coils? <Groups with concentric coils and connected in two parallel three-phase stars, the beginnings of which form three-phase clamps to the polarity p _7, and their zero points - two additional clamping for the pole p _2, characterized in that, in order to increase and improve the use of copper for the polarity parameter p ₇ and p _2, each coil group containing four katu ki with steps along the grooves, at _R = 12 - 2 (k-1), coils with numbers k = 1 and 3 are connected in series, according to both of form a first subgroup, the coil r number k = 2 forms a second subgroup numeral coil to = 4 forms the third subgroup, in the first phase the first and second stars are therefore included in the first star. subgroups of the coil group — the first and third subgroups of the coil group of the fourth; in the first phase, the first and second subgroups of the coil group of the fourth and third subgroups of the coil group of the first are sequentially included in the second star; the coil group of the first and the beginning of the first subgroup of the coil group of the fourth are connected together, and the other phases are made in the same way as the first phase and the numbers of their coils groups of alternating relative to the groups of the first phase with an interval of two groups for the second phase and four groups for the third phase, where k = 1-4 is the number of the coil in the coil group. 2. Winding pop. 1, with the fact that, the number of turns of coils with numbers k = 1, 2, 3, 4, in each coil group are treated as 2: 3: 2: 1. - P ₂ = 1/6, of six distributed coil groups connected in phases to parallel branches, the beginning of which form three-phase clamps for and their ends are connected 1 1141516