SU1495920A1 - Three-phase winding for combined electric machine - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to simplify the design of the winding and its manufacture, as well as to reduce copper losses. The winding for the electric combined machine with the numbers of pole pairs of the fields P ₁ / P ₂ = 1/5 is made with the pole strength P ₂ = 5 in Z = 48 slots of 3P ₂ = 15 coil groups with numbers 1 + 3K in the first phase, 2 + 3K in the second phase and 3 + 3K in the third phase, included in each phase sequentially-according, where K = 0, 1, 2 ... (P ₂ -1 = 4). Each group comprises two coils - one-layer and two-layer with the numbers of turns, respectively 2W _K and W _K in increments of grooves Y _n = 5 for ravnoshagovyh coils third, fourth, eighth, the ninth, thirteenth and fourteenth groups and Y _n = 5 and 3 for concentric outer single-layer and inner double-layer coils of other groups. In the first phase, the shift angle relative to the axis of the first group for the axes of the seventh and tenth groups is ± 19Α, and for the axes of the two-layer and single-layer coils of the fourth and thirteenth groups, respectively, ± 9Α and ± 10Α, where Α = 360 ° / Z = 7.5 ° , the sign (+) means a shift clockwise, and the sign (-) - counterclockwise. In the other two phases, the numbers of the groups alternate with respect to the groups of the first phase with intervals of five groups for the second phase and ten groups for the third phase and their axes are offset with respect to the axes of the groups of the first phase by an angle of ± 16. The clamps of the phases started from the beginnings of the first, second and third groups. Grooves with numbers 10, 13, 26, 29, 42, 45 contain W _K turns and are filled with winding half. 7 il.

Description

This invention relates to windings of electric machines of alternating current with two polarized magnetic fields in a common magnetic core.

and can occur, for example, in single-machine frequency and number phase converters.

3, 149

The purpose of the invention is to simplify the design of the winding and its manufacture, as well as improve the electromagnetic parameters and reduce losses in copper.

FIG. 1 shows the scheme of the proposed winding; FIGS. 2 and 3 show alternating phase zones of the proposed and known two-layer windings, respectively; in fig. 4 is a diagram of the shift of the axes of the coil groups of the proposed winding for the fullness of p 5; Fig. 5 shows the EMF diagram of coil groups-phases of the proposed winding for polarity p t; in fig. 6 and 7 - j MDS polygons of the proposed and known two-layer windings, respectively.

The winding (fig. 1) is three-phase symmetric with pole length j p 5 in Z 48 phases with numbers from 1 to 48 out of 3p 15 coil groups (with numbers from 1g to 15g) with two I coils each - single-layer with the number of turns 2w c, and double-layer c; the number of turns wjj. The first phase contains groups 1g, 4g, 7g, South, 13g,: the second phase - groups 2g, 5g, 8g, Ig: 14g, the third phase - the groups Зг, 6g, I 9g, 12g, 15g, included in each phase ; in series with the clips of the beginning of the phases from groups 1g, 2g, 3g, denoted by C1, C2, Sz (in: FIG, phase 1 are connected into a star). For

equal-step coils of the Zg, 4g, 8 groups; 9g, 13g, 14g grooved step is equal; y, 5. For concentric outer single-layer and inner two-layer coils of all other groups, the groove steps are equal to y 5 and 3. In the first phase, the angle of shift relative to the axis of the first group for axes of groups 7g and South is + 19 ° (, and for axes of two-layer and single-layer coils of groups 4g and 13g are equal, respectively, where eats 7.5% means a clockwise shift and a sign - against the arrow. In the other two phases, the numbers of the groups alternate with those of the first phase with intervals of five groups for the second phases and ten groups dp of the third phase and their axes are shifted tnosktel- axes but groups of the first phase angle + 16Y ± 120 ° (for the polarity p 5, this angle is increased in the time slots 5 p numbers 10, 13, 26, 29, 42, 45 comprise coils and filled w

winding half (in FIG. 2, these grooves are shaded). In FIG. 1, the arrows show the directions of the three-phase current when powering the winding through the clamps C1, C2, C3 (p 5) and they correspond to alternating phase zones. in fig. 2, denoted (and in FIG. 3) by A-Z-B-X-C-Y; Goks of the phase zones are depicted by vectors in the center of FIG. 6 and 7 „

The emf of the coil groups is proportional to the coefficients of the shortening of their coils and for polarities p, 5 (with a pole division of 48/10 4.8); equal: 2sin (7-5 / 9.6) + sin (if - 3 / 9.6) 2.8272 - for groups with Eur 5 and 3 dp 2W | and w | coils; s in C 5 / 9.6) 0.9979 and 2sin (, 6) 1.9957 for coils of the two-layer and single-layer groups with yj, 5 with W and coils. According to the diagram of FIG. 4, the shifts of the axes of the groups for polarity p 5 of line 01, 07, 010 correspond to the axes of the Ir, 7g, South groups, and the lines 04, 013, 04, 013 to the axes of the two-layer and single-layer coils of the 4g and 13g respectively. For groups 1g, 7g South, the EMF vector coincides with line 01 and is 2.8272 (1 + 2-cos 7.5) 8.4332; for groups 4g and 13g, the EMF vector has a line direction in the middle of lines 01 and 07 and is equal to 2 ( 3 (0.9979) cos 18.75 ° 5.6695, and the EMF of the phase (by the cosine theorem) is equal to

E5p 48.43322 + 5.66952 + 2-8.4332

and 5.6695.cos 3, 14.0954 and then the winding coefficient is equal to Kogg 14.0954 / 15 0.9397, and the middle step of the coils along the grooves is y = (5.6 + 3-3 + 5-6) / 15 69/15 4, BCF-filled 45 slots from 48). The emf of all three phases is the same and shifted to angles of 120 ° (electric degrees with P2 5) i For PY 1 polarity, the EMF of the coil groups is: 2sin (7.5 / 48) -t sin (t 3/48) 0.8380 - dl groups with packs 5 and 3 | sin (5/48) 0,, 3214, and 2sin (ir-5/48) 0.6429 for cathek groups with y 5, In the diagram of FIG. 5 shift the EMF of the phase groups of the winding of FIG. 1 for the polarity of the p., 1, the emf of the mutual inductance ЬЕ, 0.8380 (1-2x008 37.5) + + 2-О-3214 cos 67.5 + 2-0.6429 XCOS 75 0.0871 O, t is determined. e. the winding has a mutual inductance. with a field of polarity p 1,

R

 B, 49132, where k06 5 0.9536; G 5.991%; The emf gf of such a winding, defined as the winding of FIG. 1, is equal to AC, 0.339.

Thus, the proposed winding (FIG. 1) is much simpler in design and manufacture than the winding is known (FIG. 3). In addition, it has better electromagnetic parameters, since for it there is significantly less EMF & E, (0.339 / / 0.087 3.9 times) and, therefore, less copper loss from equalizing currents caused by EMF

five

The MDS polygons (Figs. 6 and 7) are constructed using an auxiliary triangular mesh and its reversal is taken as 0.5 units. The differential dispersion coefficient C d, C3S, which characterizes the quality of the winding according to the level of the highest and lowest harmonics in its MDS curve, is determined from the NTC polygon. 6 for the proposed winding (Fig. 1) are defined as R: R |

1 -2lR 7.75 - square of average

the radius of the slot points (i 1-48); R2 (z Kc6 / P fr) 2 (45-0.9397 / 5 v lr) 7.24709 - the square of the radius of the circle for the main harmonic

MDS (z 45 - the number of winding-filled manholes); With d () - About IES 6.939%. For a two-layer winding prototype with p. 5, Z 48, Pack 2 5 and the alternation of the phase zones of FIG. 3, of FIG. 7, 9.0; R2 (48-0.9536 / 5-7) 2

field operation with pole p

,

combined magnetic circuit; higher degree of use of copper (in 0.9397) f v5 / 0j9536 4.6 (1.071 times). In this case, the quality of the winding deteriorates somewhat due to the larger value of the coefficient bd.

The proposed winding is used in asynchronous single-machine frequency converters, the stator of which has 48 slots. Such a converter has on the stator two separate three-phase windings - a motor winding with a polarity of p, 1 and a generator with a polarity of p, j 5, and

a rotor with slip rings - one phase winding connected; type 2J,

The use of a pre / shorted winding allows to simplify the design of the converter and the manufacture of its stator; Copper consumption and insulation (slot and frontal parts), as in 36 slots of 48, the winding has single-layer coils and in them ot-. there is no interlayer insulation; to improve the energy indices of the machine, since the EMF E is significantly reduced, the induction in the phases is mutually inductive by the field with pole 1, and copper winding losses are reduced. The proposed winding can also be used in other types of combined electric machines.

Claims (1)

Invention Formula Three-phase winding for an electric combined machine with the numbers of pole pairs of fields 1/5, made in 48 slots with numbers from 1 to 48 of Zr2 15 coil tubes with numbers from 1g to 15g, containing; When the groups with numbers 1 + 3k are in the first phase, 2 + 3k are in the second phase, 34-3k are in the third phase, connected in each phase sequentially, consistent with the phases from the beginnings of groups 1d, 2d and 3g and the ends of groups 13g, 14g and 15g, which means that, in order to simplify the design and manufacture, as well as reduce copper losses, each coil group contains two coils with groove steps j 5 trt equalstage coils of the Zg, 4g, 8g, 9g, 13g and 14g groups and 5 and 3 for the concentrating coils of the other groups, the coils of the 1g-5g groups contain respectively 2w turns 2wn. and w, 2wn and w. and, 2w t and Wfc and their numbers tc and k W | the initial sides are laid in the slots with numbers 1 and 2, 4 and 5, 7 and 8, 10 and 11, 14 and 15, respectively, with: than the specified number of turns and ways-. each coil is repeated for groups 6g-South with an offset of the slots by 16 noers, and for groups 11g-15g with a mixture of the grooves by 32 numbers, where k  0,1,2, .. ,, (p - 1).     2g 3r rSr Br 7r Sr Eg South Pg) Zr S3 ,. / ". , . D / . hL Jc FIG L