RU2331148C2 - THREE-PHASE TWO-LAYER ELECTRIC MACHINE WINDING IN z=138·c GROOVES AT 2p=22·c AND 2p=26·c POLES - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: application: electric machine engineering. Invention resolves the problem of differential scattering factor σ_d, symmetrical to m'=3-zone electric machine fractional (q=46/11 and q=46/13) loop winding. For this purpose three-phase electric machine winding in z=138c grooves: 1) at 2p=22·c poles with grooves number per each pole and phase q=z/3p·46/11 is arranged from 3p·c coil groups with numbers from 1"Г"...33"Г" c and coils arrangement according to 54444544444 line being repeated 3·c times: first group is five-coil 1"Г"...11"Г" group where coils are repeated in grooves in the following order y_Gi=10, 8, 6, 4, 2 c (1-x) w_k, w_k, w_k, W_k, (1-x) w_k as loops, whereas four-coil groups are as follows y'_Gi = 9, 7, 5, 3 c w_k, (1+x) w_k, w_k, (1-x) w_k in 3"Г", 4"Г", 9"Г", y'_Gi=6, 6, 6, 6 c w_k, (1+x) w_k, w_k, (1-x) w_k in 2"Г", 7"Г", 8"Г" and (1-x) w_k, w_k, (1+x) w_k, w_k in 5"Г", 10"Г", 11"Г" at x value =0,45; 2) at 2p=26·c poles with grooves number per each pole and phase q=z/3p=46/13 is arranged from 3p·c coil groups with numbers from 1"Г"...39"Г" c and coil arrangement according to 4434343434343 line being repeated 3·c times: first grouping includes 1"Г"...13"Г" four-coil groups with coil located in grooves in the following order y'_Gi = 8, 6, 4, 2 c w_k, w_k, w_k, (1-x) w_k as loops, and three-coil groups y'_Gi = 7, 5, 3 c w_k, (1+x) w_k, w_k as loops at x value = 0.63, where c = 1, 2, 3,...; 2w_k - number of groove loops fully filled with winding. The said distribution of uneven loop coils is repeated in each subsequent grouping.

EFFECT: production of three-phase two-layer electric machine winding being able to reduce differential scattering factor.

2 cl, 8 dwg

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 double-layer loop symmetric m = 3-phase, 2p-pole windings are known, performed in z grooves from m'p coil groups with coils of equal steps or concentric with an average pitch of grooves y _k ≈τ _П = z / 2p, the number of grooves per pole and phase q = z / m'p, where m '= 2m = 6 or m' = m = 3 is the number of phase zones per pair of poles [Voldek A.I. Electric cars. L .: Energy, 1978, S. 392-394]. Fractional windings at q = z / m'p = N / d and d≥2, not multiples of m = 3, create harmonic MDS in the series ν = km '/ d ± 1 [ibid, p. 450], including lower ν <1 with increasing differential scattering σ _d% , where ± k is an integer giving the order of harmonic ν> 0 for forward (+) or counter (-) rotation.

The invention aims to reduce the differential scattering m '= 3-zone winding in z = 138 with grooves at 2p = 22 · s and 2p = 26 · with poles, performed with q = z / 3p = 46 / p (N = 46) from 3r · s groups by known groups [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 electric machine winding in z = 138 · with grooves: 1) at 2p = 22 · with poles with the number of grooves per pole and phase q = 46/11, made of 3p · from coil groups with numbers 1Г ... 33Г · s and grouping coils in a row 54444544444 repeated 3 · c times: in the first grouping 1Г ... 11Г groups five-coil have coil steps in grooves y _Пi = 10, 8, 6, 4 , 2 s (1-x) w _k , w _k , w _k , w _k , (1-x) w _k turns, and four- _coil y ' _Пi = 9, 7, 5, 3 with w _k , (1+ x) w _k , w _k , (1-x) w _k in 3G, 4G, 9G, y ' _Пi = 6, 6, 6, 6 with w _k , (1 + x) w _k , w _k , (1 x) w _k in 2G, 7G, 8G and s (1-x) w _k , w _k , (1 + x) w _k , w _k in 5G, 10G, 11G with xenia x = 0.45;

2) at 2p = 26 · s poles with the number of grooves per pole and phase q = 46/13, made of 3p · s coil groups with numbers 1G ... 39G · s and grouping coils in a series 4434343434343, repeated 3 · c times : in the first grouping 1G ... 13G the four-coil groups have coil steps along the grooves y _Пi = 8, 6, 4, 2 with w _k , w _k , w _k , (1-x) w _k turns, and three-coil at y ' _Pi = 7, 5, 3 with w _k , (1 + x) w _k , w _k turns at a value of x = 0.63, where c = 1, 2, 3, ...; 2w _k is the number of turns of the grooves completely filled with the winding. The indicated distributions of unequal coils are repeated in each subsequent grouping.

Figure 1 shows a scan of the groove layers of the proposed winding with c = 1 and z = 138 for 2p = 22 with groups 1G ... 33G (numbered above) for z '= z / 3 = 46 grooves with numbers 1 ... 46 below, by alternating phase zones in the sequence ABC, XYZ in the upper and lower layer, where the blackened grooves are incomplete with equivalent z _e = 3 (N-4x) completely filled grooves; figure 2 shows a diagram of the shifts of the axes of the groups of zones And relative to the axis of symmetry 31G; figure 3, 4 on a triangular grid with its side per unit length constructed polygons of the MDS winding of figure 1 with x = 0 (figure 3) and x = 0.5 (figure 4). Figure 5 ... 8 shows the same as figure 1 ... 4, but for winding at 2p = 26, the axis of symmetry in 34G and z _e = 3 (Nx). Such m ′ = 3-zone windings of FIG. 1, FIG. 5 are connected by sequentially switching on the groups of zones A, B, C in phases I, II, III, and the phases can be mated in Y or Δ. With, for example, c = 2-z = 276.

For the winding of Fig. 1, equal-turn (x = 0), the winding coefficient K _ob for shortening coefficients K _y = sin (90 ° y _k / τ _P ) for y _k = 6, τ _P = z / 2p = 69/11 and the distribution K _p = sin (60 °) / Nsin60 ° / N is equal to K _ob = K _y K _p = 0.82514, and when x ≠ 0 to K _ob , the value of the non-uniformity of the coils, determined by figure 2 at α _П = 360 °, is added / z = 60 ° / 23: -x (0.595128 + 0.480157) cos0.5α _P = -x2.15001 for 1G + 28G, x (0.983462-0.682553) (l + 2cosα _P ) = + x 0.902102 for 31G + 4G + 25G, 2x0.997669 [cos (2-5.5) α _G -cos (2 + 16.5) α _P + cos (3-5.5) α _P -cos ( 3 + 16.5) α _П + cos (4-5.5) α _П -cos (4 + 16.5) α _П ] = x2.16808 for 7Г + 22Г + 10Г + 19Г + 13Г + 16Г at К _yi = 0.595128 (y _Pi = 10), 0.997669 (y _Pi = 6), 0.480157 (y _Pi = 2), 0.983462 (y ' _Pi = 7), 0.682553 (y' _Pi = 3), K _about N = 37.9563, Σx = 0.9202 and

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]

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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 = 46 groove points, R _о and К _ob - for harmonic ν = 1:

According to (1) - (3) from the condition d (σ _d ) / d (x) = 0, the optimal x _opt = 0.45 is calculated, corresponding to σ _{d% min} : K _rev = 0.86811, R ² _d = 524.085 / 46, R _o = 132.6 · 0.86811 / 11π, σ _{d% min} = 2.68 for z _e = 3 (N-4x) = 3 · 44.2 = 132.6, and at x = 0 - σ _d% = 5.72, i.e. the value of σ _{d% of the} winding of Fig. 1 decreases by 5.72 / 2.68 = 2.13 times, and taking into account the increase in K _, its efficiency is equal to K _eff = (0.86811 / 0.82514) (5.72 / 2 68) z _e / z = 2.16.

Similarly, in Fig. 5 ... 8 for 2p = 26: K _rev = (37.88735 + x2.06773) / (46-x), R ² _d = (388-14x + 44x ² ) / 46 and at x _opt = 0.63-K _rev = 0.8638, σ _{d% min} = 4.05 for z _e = 3 (Nx) = 3 · 45.37 = 36.11, and at x = 0 - σ _d% = 8.90, i.e. σ _{d% of the} winding of FIG. 5 decreases by 8.90 / 4.05 = 2.2 times due to the elimination of harmonic MDS ν = 1/13; K _eff = 2.27. Compared to m '= 6-zone winding at 2p-26, z = 138, q = z / 6p = 23/13, y _k = 4, K _rev = 0.8844 and σ _d% = 5.16, m '= 3-zone winding has a reduced σ _d% of 5.16 / 4.05 = 1.27 times and is much easier to manufacture due to half the number (3p) of groups.

The application of the proposed winding on the stator HELL allows you to reduce additional losses in steel and moments from harmonic fields, improve vibroacoustic characteristics, increase efficiency, cosφ ₁ , and in synchronous generators it improves the shape of the output voltage curve.

Claims (2)

1. Three-phase two-layer electric machine winding in z = 138 · c grooves at 2p = 22 · s poles with the number of grooves per pole and phase q = z / 3p = 46/11, made of 3p · s coil groups with numbers from 1G to 33G · With and grouping coils in a series of 5 4 4 4 4 5 4 4 4 4 4, repeated 3 · c times, characterized in that in the first group of 1G ... 11G five-coil groups have coil steps in grooves y _pi = 10, 8 , 6, 4, 2 s (1-x) w _k , w _k , w _k , w _k , (1-x) w _k turns, and four- _coil y ' _pi = 9, 7, 5, 3 s w _k , (1 + x) w _k , w _k , (1-x) w _k in 3G, 4G, 9G, y ' _pi = 6, 6, 6, 6 with w _k , (1 + x) w _k , w _k , (1-x) w _k in 2G, 7G, 8G and (1-x) w _k , w _k , (1 + x) w _k , w _k in 5G, 10G, 11G with x = 0.45 and such a distribution of unequal coils 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. 2. Three-phase two-layer electromachine winding in z = 138 · c grooves at 2p = 26 · s poles with the number of grooves per pole and phase q = z / 3p = 46/13, made of 3r · s coil groups with numbers from 1G to 39G · C and the grouping of coils in a row 4 4 3 4 3 4 3 4 3 4 3 4 3, repeated 3 · c times, characterized in that in the first group of 1G ... 13G groups, the four-coil ones have coil steps in grooves y _pi = 8 , 6, 4, 2 with w _k , w _k , w _k , (1-x) w _k turns, three-coil - y ' _pi = 7, 5, 3 with w _k , (1 + x) w _k , w _k turns at a value of x = 0.63 and this distribution of unequal coils 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.

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