SU1504737A1 - Three-phase asymmetrical electric machine winding - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to simplify the design and manufacture, as well as reduce copper losses. The winding for the combined electric machines with the numbers of pole pairs of fields P ₁ / P ₂ = 1/3 is made with pole strength P ₂ = 3 in Z = 48 slots from 6P ₂ = 18 coil groups with concentric coils, with numbers of groups 1 + 3 _k in the first phase, 3 + 3 _k in the second phase, 5 + 3 _k in the third phase, connected in series in the slots with the opposite inclusion of even groups are relatively odd, where K = 0.12, ..., (2P ₂ -1 = 5) . The pole, twelve, eighteen groups contain one single-layer coil with a step along the grooves Y _N = 7 and the number of turns 2W _K and their axes are offset relative to the axes of the two groups on either side of each of them by an angle of 3α, where α = 360 ° / Z = 7.5 °. All other groups contain two coils with steps along the grooves Y _N = 7 and 5 for odd groups and Y _N = 8 and 6 for the other even groups and their axes are offset relative to each other by an angle of 2.5α. For the third, ninth, and fifteenth groups, the single-layer outer and two-layer inner coils contain 2W _K and W _K turns, respectively, and for the remaining odd groups, both two-layer coils contain W _K turns. For the remaining even groups, the double-layer outer and single-layer inner coils contain W _K and 2W _K turns, respectively. Grooves with numbers 3, 16, 19, 32, 35, 48 contain W _K turns and are filled with winding half. 6 Il.

Description

 K 4 4i4i4i 4k

SP

h

O8

figure 1

31504

The nadtsa contain one single-layer coil with a step along the slots Ur, 7 and the number of turns 2w 1 and their axes are offset from the axes of the two groups on either side of each of them at an angle of 3oi, where o (360 ° / z 7.5. All others the groups contain two coils with groove steps and 5 for odd groups and and 6 for the other even groups and their axes are offset from each other by an angle of 2.5 °. For groups of the third, ninth, fifteenth

The invention relates to electrical engineering, in particular to the windings of electric machines of alternating current with two polarized magnetic fields in a common magnetic circuit, and can be used, for example, in single-machine frequency and number of phase converters.

The purpose of the invention is to simplify the structure of the winding and its manufacture, as well as the reduction of copper losses and the improvement of the electromagnetic parameters of Fig. I, the diagram of the proposed winding; in fig. 2 is an alternation of the phase zones of the proposed winding; FIG. 3 - alternation of phase zones of the known two-layer winding; in fig. 4 - vector EMF diagram of the proposed winding for polarity p, 5; FIG. 5 shows a polygon MDS of the proposed winding; FIG. Fig, 6 - MDS polygon known two-layer winding,

The winding (FIG.) Is made of a three-phase state: symmetric with pole values of p 3 in with numbers from up to 48 slots from coil groups with numbers from 1G to 18G, the First phase contains groups of 1 G, 4G, 7G, SOUTH, 1 SG, 1 61 second Phase - ZG, 6G, 9G, 2G, 15G and ISr groups, the third phase - 5G, 8G, 14G, 17G and 2G groups, connected in phases successively with the opposite inclusion of even groups of relatively odd ones. and 5G and are designated as C1, C2 and Sz. The phases are connected into a star (Fig. 1), but a connection in a triangle is also allowed. Groups 6G, 12G and 18G contain one single-layer coil with a step along the grooves equal to 7 and the number of turns equal to 2w, while their axes are offset from

single-layer outer and double-layer inner coils contain respectively 2W | for coils, and for other odd groups both bilayer coils contain w turns. The 11 remaining even-numbered double-layered outer and single-layer inner coils contain V7 and 2h 1 turns, respectively. The grooves with numbers 3,16,19,32,35,48 contain w turns and are filled with a winding half. 6 nl.

two adjacent groups on either side of each of them at the angle Z0 /, where

ci 360 / z 7, 5 °. All other groups contain two concentric coils with agami in grooves, different lv 7 and, for odd groups and with steps in grooves equal to and, for

the other even groups, while their axes are displaced relative to each other by an angle of 2.5 ° (o (. For the ZG, 9G, and 15G groups, the single-layer outer and two-layer inner coils contain

respectively, 2w and w turns, and for the remaining odd groups, both two-layer coils each contain w turns,. For the other even groups (except 6G, 16Gi and 18G), there are two-layer outer and

single-layer inner coils contain, respectively, w and 2w turns. The grooves with numbers 3, 16,19,32,35 and 48 contain w. Turns and are filled with a winding half (on

FIG. 2 these grooves are shaded).

Winding (figure 1) works as follows.

The arrows in Fig. 1 show the directions of the three-phase current when the winding is supplied through Ci, C2 and C3 () and they correspond to the alternation of the phase connections indicated in Figs. 2 (as in FIG. L) through A-Z-B-X-C-Y, Zone current vectors are depicted in the center of FIG. 4 5 and FIG. 6.

The emf of coil groups is proportional to the shortening coefficients of their coils and for pole position (with pole division) are: 2sin (i 7/16), 9616 for groups 6Г, 12Г and 18Г (7 for 2Wj turns); 2sLn () + sin (f ((2.7930 - for groups ZG, 9G and 15G (y, 7 and y for 5w c and W 1 turns) ;, sin (ff-7/16) +

+ 81d (((5 / 1b) 1, 8123 - for the remaining odd groups (and with w c turns); sin (; -8/16) + 2sin (tf.6 / l6) 2.8478 - for the other even groups (y, 8 and with w and 2w turns). FIG. 4 shows the division of the circle into parts (o (7.5) and depicts the EMF of the groups for the pole, which correspond to the ANGLES about (2, 5, -5 ° and o ((p 2.5 7,, 25 (in electrical degrees)). For the first phase, the groups Г, 7Г and 1ЗГ (displaced relative to each other by angles of 7.53) correspond to Vectra 01, equal to 3, 8, 4369 , and groups 4G, YG and 16G (also shifted by 360 electrical degrees) correspond to the vector 04, equal to 3-2,, 5434. So to The lines 01 and 04 are shifted by an angle of 56 °, 75 °, then the emf of the first phase is determined by the OA vector, which is (by the cosine theorem), 13.9163, and the angle (by the sine theorem) is 37 03 corresponds to ZG, 9G and 5G groups and is equal to 3, 2, ..., 3790, Group 6G, 12G, and 18G is vector and is equal to 3 liters, 8848, and the phase EMF is determined by the OT vector and equals, 3790 + 5.8848 14, 2638, For the third phase (similarly to the first phase} vector 05 corresponds to groups 5G, and 17G and is equal to 34,, 4369, vector 02 - to groups 2G, 8G and 14G and is equal to 3-2, 9163, a, 37. Fig, 4, the angles of shift of the vectors of the EMF of the phases are equal ((+ ,, 19,37 °

6

 ov xii, -4, 19.3 / And g-P, 25 +2 4,, 24 °, Average value of the winding coefficient As per FIG. 5, for the proposed winding (FIG. 1), the following is determined:

of the slot and the step of the coils in the grooves are (2 13.9163 + 14.2638), 9355 and 45 Yncp t (7 + 5) 12 + 7 12 + 5-3J / 45 29l / 45 4,467 (45 slots out of 48 are used) .LINE1 EMF windings (fig.I) are equal

(by the cosine theorem), 3287

"/, -P 19.95126 - the square of the radius of the circle, and 2529 and the coefficient k" asym- "of the main harmonic GVA metrics. for them are determined by the formulas

2 1 i

R - 21 P. .20,4375 - square of media Z, I

of the radius of the slot points () R (z - K (p / p.f) (45 0.9355 / 311 f

(z 45 - the number of filled slots);

(Rj / R), 437%, ZtnH iz e s tny; two-layer around-55 coils (fig.Z) of FIG. 6 determine

S a + b + c 72.9103; A (, 3291;

(S-2a) (S-2b) (S-2c) / 6

“295.3265; , 3034;

E, 05in;

 (E / D), 210%.

For the well-known two-layer winding with and alternation of phase, zones, shown in Fig. 3, (by the row 323233332), we get the following analogous recounts: linear

, Q EMF equal, 6883; , 8927; , 932; , 25 4, H CA 120,875; , 527%.

If we consider the winding (fig, 1) in a field with a polarity of p, 1 (in combination 5 schennm magnetic conductor c), then for this pole odd groups of the first phase are shifted by angles in (for groups G, 7G and 1 SG) by the same angles are offset and even

20 groups 4G, SOUTH and 16G and, therefore, the sum of their EMF LE from a floor with polarities p, 1 is LU, 0, the same is true for the other two phases. Thus, the winding (FIG. 1)

25 does not have an inductance coupling with a field of polarity p 1, while for a known winding such a connection is even more / 1E, 0 (up to 7-10% of the EMF of the main pole) 5 in copper from equalizing currents.

The quality of the proposed winding is estimated by the coefficient 6 differential35

40

the total content of the higher and lower harmonics in its MDS curve, the Coefficient (J., determined by the MDS polygon, which is constructed using an auxiliary triangular grid, taking its side as a unit of length (Fig.5 and Fig.6 ),

In FIG. 5, for the proposed winding (FIG. 1), the following is determined:

45

2 1 i

R - 21 P. .20,4375 - squared media - Z, I

its radius of the slot points (); R (z - K (p / p.f) (45 0.9355 / 311 f

-n 19.95126 - square of radius, circumferential „main harmonic GVA

(z 45 - the number of filled slots);

(Rj / R), 437%, ZtnH iz e s tny; two-layer around-55 coils (fig.Z) of FIG. 6 determine

Rd 23.25i

R (48 0.9320 / 3 i), 53056; 6j.3.193%.

Thus, the proposed winding is simpler in design and manufacture than the two-layer winding is known, and also surpasses it in electromagnetic parameters: it has lower values of K, p (n 0.527 / 0.210-2.51 times and coefficient yd (3.193 / 2, , 31 times), has a better use of copper because of a smaller pitch value of 0.93557 / 0.9320v &, 467, 09 times};

The proposed winding is used in asynchronous single-frequency converters for which the stator has 48 slots. Such a converter (at a power of 8.0; 16.0; 24,05 and 40,0 kW) contains on the stator two separate three-phase windings - motor with a plus and a generator with a polarity of P2 3, and on the rotor with contact rings - one use of the proposed winding simplifies the construction of the stator and its manufacture, reduces the consumption of copper and the slot insulation on the stator, improves the electromagnetic parameters by reducing the asymmetry factor of phase voltages and a decrease in the differential scattering and eliminates losses edi winding of equalizing currents due ZDS vzaimoiE pike-tion of the floor. In addition, the winding may be used in other types of combined electrical,

Claims (1)

Invention Formula Three-phase asymmetric electric winding for a combined electric machine with the number of pole pairs of fields, made in 48 slots with numbers from 1 to 48 of 6p. coil groups with numbers from 1G to 18G, containing groups with numbers 1 + 3; in the first phase, 3 + 3 c - in the second phase, 5 + 3, - in the third phase, connected in each phase consistently with the opposite inclusion of even groups of relatively odd n with the conclusions of the phases from groups 1G, SG, 5G and 16G ,, 8G (2G, different with TeMj that, in order to simplify the design and manufacture, as well as reduce copper losses and improve the electromagnetic parameters, groups 6G, | 12G, 1VG contain a coil with a step along the slots yJ, -7, and all others the groups contain two concentric coils with groove steps y and 5 for odd groups and U, 8 and 6 for others: x even groups, groups of coils of 1G, 2G, ZG, 4G, 5G, bG groups; contain respectively numbers turns V7j 2w, and w, -w and 2v, 2w and w  . ,:, K WK initial cTopoHb; respectively laid in the grooves with numbers 1 and 2,: 3 and 4, 6 and 7, 8 and 9, 11 and 12, 14J and the indicated number of turns and laying of the coils are repeated for groups 7G, 8G, 9G, YH, IG, 12G with offset of the grooves by 16 numbers , and for groups 13Г, 14Г, 15Г, 16Г, 17Г, 18Г - with offset slots by 32 numbers, where, 1,2 ,,,. s2po-. 2Fuy; g lil ifO 39 FIG. 20