SU1539899A1 - Three-phase winding of combined machine armature - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to reduce losses in copper by reducing the EMF of mutual induction from the winding floor with a polarity of Pb = 1, as well as improving the electromagnetic parameters by increasing the winding coefficient and reducing the differential scattering. A three-phase windings of the armature of the combined machine with pole pair numbers of fields P = 7 and P = 1 is formed with a pole P = 7, bilayer at Z = 48 slots of 6P = 42 coil groups with coils step of grooves Y _n = 4 and a group of coil groups range 2111111 repeated six times. The phases contain groups with the numbers 1 + 3K, 3 + 3K, 5 + 3K, respectively, in the first, second, and third phases, connected in each phase successively with the opposite inclusion of even coil groups with respect to the odd ones, where K = 0, 1, 2, .. . (2P-1). New is that the coils contain 0.7 ^. W _K turns - for groups with numbers 1 + 7K, 1,0W _K turns - for groups with numbers 1 + 7K ± 1 and 1 + 7K ± 2, 1.3 ^. W _K turns for groups with numbers 1 + 7K ± 3, where 2W _K is the number of turns in the slot. The winding is used for electric machines of alternating current of the combined type with two opposite-pole magnetic fields in a common magnetic circuit, for example, for single-machine frequency converters and number of phases. 4 il.

Description

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

The aim of the invention is to reduce losses in the copper winding by reducing the emf of mutual induction from the field.

with a polarity of p 1, as well as an improvement in the electromagnetic parameters by increasing the circumferential coefficient and reducing the differential scattering.

FIG. 1 shows alternations of phase winding zones; in fig. 2 and 3 are diagrams of the emf of the phase coils for the polarity p 7 (Fig. 2) and p 1 (bi 3);

in fig. 4 - MDS winding polygon for polarity p 7.

The winding is made with polarity p 7 double-layer (Fig. 1), three-phase in z 48 grooves from 6p 42 coil groups with numbers from 1G to 42G with coil pitch along grooves yn 4, has qz () 7 and grouping coil groups by row 2111111 (repeated six times). Phases contain groups with numbers 1 + 3k, 3 + 3k, 5 + 3k respectively in the first - third phases (groups 1G, 4G, 7G, SOUTH, 13G, 16G, 19G, 22G, 25G, 28G, 31G, 34G, 37G, 40G in the first phase - in Fig. 1), where k 0,1,2, ..., (). In each phase, the groups are connected in series with the opposite inclusion of even groups with respect to odd ones. Phases of the winding zone are designated as in the first phase, B-Y in the second phase, C-Z in the third phase and their alternation is shown in FIG. one,

ten

xsin (F-4-7 / 48) 14.8859 WK, where 48/14 is the pole division for p 7; winding winding coefficient K 06-7 E7 / 16 wk 0,9304.

Similarly, two other phases are performed, the group numbers of which alternate with respect to the groups of the first phase at intervals of ten groups for the second phase and twenty groups for the third phase. The coil groups with numbers 1 + 7k correspond to katuiki with 0, coils, the groups with numbers 1 + 7k ± 2 - coils with WK coils - 15 ka, the groups with numbers 1 + 7k + 3 - coils with 1,3 WK coils.

The MDS winding polygon (outer in FIG. 4) is constructed in accordance with FIG. 1 using an auxiliary triangular mesh: layers of notches with 0.7 WK; 1.0 WH; 1.3 wk turns correspond to 3.5; 5.0; 6.5 sides of the grid. According to FIG. 4 are defined: R

20

 4.47625 is the square of the average radius, where the numbers from 1 to 48 are numbered; the 25 grooves of the polygon relate the slots of the winding. Zone A, B, C, respectively, of its center (points with numbers are shown according to those included in fa-1-48); R (48 -0.9304 / 7 if) 4,12407- Zah to the sides of the coil groups, and the squares of the square of the radius of the circle for the base, X, Y, Z - opposite to included. The harmonic MDS; 6 "l (Ra / R)

100 8.54% is the differential scattering coefficient characterizing the content level of the highest and lowest

The EMF tori in FIG. 2 and 3 are assigned the slot numbers of the upper layer of the coils and the circle is divided into z 48 parts (d 360/48 S0).

From FIG. 3 it can be seen that the EMF of mutual induction in the phase of the winding from the floor with a polarity of p 1 with equal-turn coils is equal to: 4Е, 4w K (cos 3.75 +

thirty

harmonic in the MDS winding curve. When performing the winding of FIG. 1 with equal-turn coils, its electromagnetic parameters are equal (see the inner polygon in FIG. 4, for

+ cos 48,75 ° - cos 78,75 ° - cos 26,75) of which one layer of the groove corresponds to xsin (TT4 / 2-24) 0.585 w., where 2w - 2.0 sides of the grid: k0S7 0, 9231;

the number of turns in the groove. - pole- ... Rq 4.75; R - 4,05917 and C-17.02%.

I. t

Thus, the proposed winding with the same copper consumption as the prototype copper flow has a significantly lower EMF of mutual induction (AE, 0) from the floor with pole p 1 and green division for p f 1. To reduce the EMF of the LE1 winding coils are made of different turns (see Fig. 1). Accepted in the coils of the first phase (zones A through X) for groups 1G and 22G of xwk rolls,

for groups 4G, 19G, 25G, 40G - (2-x) wK is convincingly, smaller losses in copper from

equalizing currents, as well as improved electromagnetic parameters: a higher winding ratio (0.9304 / 0.9231 times) and a smaller differential scattering coefficient (17.0 / 8.54 0.2 times).

The use of the proposed winding in a combined electric machine allows to improve the electromagnetic

DE, 0. At the same time, the phase EMF for the pole-55 parameters, to reduce the losses in median p 7 (see Fig. 2) is obtained (due to a decrease in the balancing currents) equal to: E7 4 wk (193 cos 3,75 ° + and in steel (due to a decrease in the content - + cos 11.25 ° + cos 18.75 ° + cos 26.25 °) nor higher harmonic MDS), turns, turns, and for the other groups of this phase -WK turns, for EMF 4E we obtain: DE, cos 3.75 ° + (cos 48.75 ° - - cos 78.75 °) - (2-x) cos 26.25 ° xsin (TG-4/48) (1e9616 x - 1 , 3764) -wK, whence with DЕ, 0 we define x 0.7 and (2) 1,3. This ratio of the number of turns of the coils provides the same number of turns of 2wk in all slots and

0

xsin (F-4-7 / 48) 14.8859 WK, where 48/14 is the pole division for p 7; winding winding coefficient K 06-7 E7 / 16 wk 0,9304.

Similarly, two other phases are performed, the group numbers of which alternate with respect to the groups of the first phase at intervals of ten groups for the second phase and twenty groups for the third phase. The coil groups with numbers 1 + 7k correspond to katuiki with 0, coils, the groups with numbers 1 + 7k ± 2 - coils with WK turns 5 ka, groups with numbers 1 + 7k + 3 - coils with 1,3 WK coils.

The MDS winding polygon (outer in FIG. 4) is constructed in accordance with FIG. 1 using an auxiliary triangular mesh: layers of notches with 0.7 WK; 1.0 WH; 1.3 wk turns correspond to 3.5; 5.0; 6.5 sides of the grid. According to FIG. 4 are defined: R

0

harmonic in the MDS winding curve. When performing the winding of FIG. 1 with equal-turn coils, its electromagnetic parameters are equal (see intraRq 4.75; R — 4.05917 and C- 17.02%.

  t

Thus, the proposed winding, with the same copper consumption as the prototype winding, has a significantly lower EMF of mutual induction (AE, 0) from the floor with polarity p 1 and the efficiency of the combined electric machine.

Claims (1)

Invention Formula 1 Three-phase winding of the core of a combined machine with the numbers of pole pairs of fields p 7 and p 1, made two-layer in z 48 grooves of k 48 coils with a step along the slots 4 and 6p 42 coil groups with numbers from 1G to 42G, containing groups 1 + 3k, 3 + 3k, 5 + 3k, respectively, in the first, second, and third phases, connected in each phase successively with the opposite inclusion of even groups of relatively odd and with terminals of the beginnings and ends of the phases from the beginnings of groups 1G, 15G, 29G and 40G, 12G, 26G, characterized in that, in order to reduce losses in copper by reducing the EMF of mutual induction from the winding floor with polarity pg 1, as well as improving the electromagnetic parameters by increasing the winding coefficient and reducing the differential scattering, the 1 + 7c groups contain two coils the number of turns in each xw, and the remaining groups contain one coil with the number of turns WK for groups with numbers 2 + 7s, 3 + 7s, 6 + 7s, 7 + 7s and (2-x) -wk for groups with numbers 4 + 7s , 5 + 7s, where k is 0,1,2 ..., (2р-1), с 0,1,2,.;., (Р-2), and the value is x 0,65-0,75 and is selected from the condition of obtaining integer on the number of windings x WK when the number of turns in the slot equal to 2 wk. 1Г Г 7Г fOr Ш Ш 9Г 22Г 25Г 28Г Ж 34Г J7f Wf 1 I S 9 П 13 15 17 19 21 23 25 27 23 J /. JS 37 J9 41 3 45 47 ЈE F Ј E 48 & h Јfe yj cw 36