RU2324274C2 - THREE-PHASE DOUBLE-LAYERED ELECTRIC MACHINE WINDING IN z=66·c SLOTS WITH 2p=26·c POLES (q=22/13) - Google Patents

Abstract

FIELD: electric machinery industry.

SUBSTANCE: three-phase double-layered electric machine winding in z=66·c slots with 2р=26·c poles with number of slots per pole and phase defined as q=z/3p=22/13 is comprised of Зр·c coil groups numbered from 1G to 39G c and coil grouping as 2221221221221 sequence repeated 3·c times. At that, in the first grouping, 1G...13G, two-coil groups have coil slot pitches of y_si=3, 3·with numbers of turns of (l-x)w_K, w_K in the 1G group and w_K, (l-x)w_K in the 3G group, y_si=4, 2 with numbers of turns of (l-x)w_K, (l+x)w_K in the 2G group and (l-x)w_K, w_K in 5G, 6G, 8G, 9G, 11G, 12G groups, while one-coil groups, 4G, 7G, 10G, 13G, have У_s=3-(1+х)w_K turns, where c=1, 2, 3, ...; 2w_K is the number of turns in those slots that are completely filled with winding, and х=0.47. This distribution of coils with different number of turns is repeated in every next grouping.

EFFECT: lowering of differential scattering factor σ_d of asymmetric t'=3-zone fractional-slot (q=22/13) lap winding of electric machinery.

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Description

The invention relates to three-phase windings of electrical AC machines, can be used on a stator of asynchronous and synchronous machines, a phase rotor of asynchronous motors (HELL).

Known loop two-layer symmetrical m = 3-phase, 2p-pole windings, made in z grooves from m'p coil groups with coils of equal steps or concentric with an average pitch of grooves y _to ≈τ _p = z / 2p, the number of grooves per pole and phase q = z / m'p whole or fractional, where m '= 2m = 6 or m' = m = 3 is the number of phase zones per pair of poles [A. Voldek Electric cars. L .: Energy, 1978, S. 392-394]. Fractional windings with q = z / m'p = N / d and d≥2 not multiple of m = 3 create, with a symmetric sinusoidal current, harmonic MDSs in the series ν = km '/ d ± 1 [ibid, p. 450], including the lowest (ν <1) with increasing differential scattering σ _d , where ± k is an integer giving the order of the harmonic ν> 0 when it is forward (+) or counter (-) rotation.

The invention aims to reduce the differential scattering m '= 3-zone two-layer winding in z = 66 · with grooves at 2p = 26 · with poles performed with q = z / 3p = 22/13 (N = 22, d = 13) from 3p · from coil groups with a grouping in a series of 2221221221221, repeated 3 · times [Livshits-Garik M. Windings of AC machines / Trans. from English L .: SEI, 1959, p.225].

The solution of this problem is achieved by the fact that for m = 3-phase two-layer electromachine winding in z = 66 · s grooves at 2p = 26 · s poles with the number of grooves per pole and phase q = 22/13, made of 3p · s coil groups with numbers 1G ... 39G · s and a grouping of coils in a series of 2221221221221, repeated 3 · s times:

for the first group of 1G ... 13G groups, the two-coil groups have coil steps in grooves at _pi = 3, 3 with the numbers of turns (1-x) w _k , w _k in 1G and w _k , (1-x) w _k in 3G, at _pi = 4, 2 with the number of turns (1-x) w _to , (1 + x) w _to 2G and (1-x) w _to , w _to 5G, 6G, 8G, 9G, 11G, 12G, and single-coil 4G, 7G, 10G, 13G with y _n = 3- (1 + x) w _to turns and such a distribution of non-equal coil is repeated in each subsequent grouping, where c = 1, 2, 3, ...; 2w _to - the number of turns of the grooves, completely filled with a winding, and the value of x = 0.47.

Figure 1 shows a scan of the groove layers of the proposed winding with c = 1 and z = 66 with groups 1G ... 39G (numbered above) for z '= z / 3 = 22 grooves with numbers 1 ... 22 (bottom) and alternating phase zones in the sequence ABC and XYZ in the upper and lower layer, where the blackened grooves are incomplete with equivalent z _e = 3 (N-4x) grooves completely filled with a winding; figure 2 shows a diagram of the shifts of the axes of the groups of zones And relative to the axis of symmetry 28G; figure 3, 4 on a triangular grid with its side per unit length constructed polygons MDS winding figure 1 at x = 0 (figure 3), x = 0.5 (figure 4). Such an m '= 3-zone winding is connected in the usual way when series-consonant inclusion in the phases of the groups 1G + (3k) G = 1G, 4G, 7G, ..., 14G + (3k) G = 14G, 17G, 20G,. .., 27Г + (3к) Г = 27Г, 30Г, 33Г, ... in phases I, II, III, and the phases can mate in a star or a triangle. With, for example, c = 2, the winding is performed in z = 132 grooves and 2p = 52 poles out of 78 coil groups 1G ... 78G.

For winding 1 ravnovitkovoy (x = 0), the winding factor K _{is about} by shortening K coefficients _y = sin (90 ° _{to the} y / τ _n) for _k = 3, y, τ _p = z / 2p = 33/13, the distribution of K _p = sin (60 °) / Nsin (60 ° / N) is equal to _about K = K _y K _p = 0.79380, and when x ≠ 0 is added to the K value _about neravnovitkovosti groups of coils defined by _claim 2, when α = 360 / z = 60 ° / 11: -2x0.959493cos (4 + 6.5) α _n = -x1.037482 for 1G + 16G, x (0.945001-0.618159) = + x0.326842 for 28G , -x0.618159 (cosα _n + cos2α _n + cos3α _n ) = - x3.6309343 for 19G + 37G + 22G + 34G + 25G + 31G, + 2x0.959493 (cos0.5α _n + cos1.5α _n ) = + h3,816266 to 4D 7D + 13D + 10D + _yi when K = 0.618159 (y _pi = 4) 0.945001 (y _pi = 2) 0.959493 (y _n = 3) to _an N = 17 , 46347 and ∑х = -0.52531 then

Of the polygons of the MDS of Figs. 3 and 4 (in the center, the unit vectors of the currents of the phase zones are shown) according to a triangular grid and relations [Popov V.I. Determination and optimization of the parameters of three-phase windings according to their polygons MDS // Electricity, 1997, No. 9, p.53-55]

the differential scattering coefficient σ _d% is determined, which characterizes the quality of the winding according to the harmonic composition of the MDS, where R ² _d is the square of the average radius j = 1 ... N = 22 groove points, R _o and K _rev are for harmonic ν = 1:

According to (1) - (3) from the condition d (σ _d ) / d (x) = 0, the optimal x _opt = 0.47 is calculated, corresponding to σ _{d% min} : K _rev = 0.85570, R ² _d = 42, 0432/22, R _o = 60.36 · 0.85570 / 13π and σ _{d% min} = 19.49 (for equivalent grooves z _e = 3 (N-4x) = 3 · 20.12 = 60.36, completely filled with a winding); at x = 0-σ _d% = 49.16, i.e. the value of σ _d% , when x _opt = 0.47 decreases by 49.16 / 19.49 = 2.52 times due to the elimination of the harmonic MDS ν = 1/13, and taking into account the increase in K _about its effectiveness is equal to K _eff = (0.85570 / 0.79380) (49.16 / 19.49) z _e / z = 2.49 in comparison with an equal-turn (x = 0) winding; compared with m '= 6-zone winding at 2p = 26, z = 66 and q = z / 6p = 11/13 <1, the proposed m' = 3-zone winding is characterized by a reduced σ _d% and is much simpler to manufacture from - for half the number (3p) of coil groups.

The application of the proposed winding on the HF stator allows reducing additional losses in steel and asynchronous moments from harmonic MDS fields, improving vibro-acoustic characteristics, increasing efficiency and cosφ ₁ , overload capacity of the machine, and in synchronous low-power generators it improves the shape of the output voltage curve.

Claims (1)

Three-phase two-layer electromachine winding in z = 66 · c grooves at 2p = 26 · s poles with the number of grooves per pole and phase q = z / 3p = 22/13, made of 3p · s coil groups with numbers from 1G to 39G · s and grouping the coils in a row 2 2 2 1 2 2 1 2 2 1 2 2 1 repeated 3 · s times, characterized in that for the first group of the 1G ... 13G group, the two coils have coil steps in grooves y _pi = 3, 3 with the numbers of turns (1-x) w _k , w _k , w _k in 1G and w _k , (1-x) w _k in 3G, y _pi = 4, 2 with the numbers of turns (1-x) w _k (1 + x) w _k in 2G and (1-x) w _k , w _k in 5G, 6G, 8G, 9G, 11G, 12G, and single-coil 4G, 7G, 10G, 13G with y _n = 3- (1 + x ) w _{to the} coils wherein such distribution ix neravnovitkovyh coils is repeated in each subsequent group, wherein a = 1, 2, 3, ...; 2w _to - the number of turns of the grooves, completely filled with a winding, and the value of x = 0.47.

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