RU2335074C2 - ELECTRIC MACHINE THREE-PHASE DOUBLE-LAYER WINDING IN z=141·c SLOTS AT 2p=22·c AND 2p=26·c POLES - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and aims at reducing differential dissipation factor σ_d of the electric machine symmetric divided loop with m'=3-section furnished with (q=47/11 and q=47/13). The three-phase machine winding at z=141c slots, is as follows, i.e 1) at 2p=22·c poles with the number of slots per a phase and pole q=z/3p=47/11, it is made up of 3p·c coil groups with the numbers from 1"Г" to 33"Г"·c and the coil group in the series 54454445444 repeated 3c times, i.e. in the first group 1"Г"...11"Г" the concentric coils feature the pitch over slots y_si=10, 8, 6, 4, 2 with (1-x)w_c, w_c, w_c, w_c, (1-x)w_c turns in five-coil groups and y'_si=9, 7, 5, 3 with w_c, (1+x)w_c, w_c, (1-x)w_c turns in the four-coil groups at x=0.43, 2) at 2p=26·c poles with the number of slots per a phase and pole q=z/3p=47/13 the winding is made up of 3p·c coil groups with the numbers from 1"Г" to 39"Г" c and the coil group in the series 4434434344343, repeated 3·c times, i.e. in the first group 1"Г"...13"Г", the concentric coils feature the pitch over the slots y_si=8, 6, 4, 2 with (1-x)w_c, (1+x)w_c, w_c, (1-x)w_c turns in the four-coil group and y_si=7, 5, 3 with w_c, (1+x)w_c, w_c turns in the three-coil group at x=0.58. The aforesaid distributions of coils with unequal number of turns are repeated in every following group, where c=1, 2, 3...; 2w_c is a number of slots filled completely with the winding.

EFFECT: reducing winding differential dissipation 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 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, 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 = 141c grooves at 2p = 22 · s and 2p = 26 · s poles, performed with q = z / 3p = 47 / p (N = 47) from 3p · s groups by known groups [Livshits-Garik M. Windings of AC machines. / Per. 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 = 141 · with grooves: 1) at 2p = 22 · with poles with the number of grooves per pole and phase q = 47/11, made of 3р · from the coil groups with numbers 1Г ... 33Г · s and the grouping of coils in a row 5 4 4 5 4 4 4 5 4 4 4, repeated 3 · s times: in the first group 1Г ... 11Г concentric coils have groove steps _pi = 10, 8, 6, 4, 2 s (1-x) w _k , w _k , w _k , w _k , (1) w _k turns in five-coil groups and y ' _pi = 9, 7, 5 , 3 s w _k , (1 + x) w _k , w _k , (1-x) w _k turns into four-coil with x = 0.43;

2) at 2p = 26 · s poles with the number of grooves per pole and phase q = 47/13, made of 3p · s coil groups with numbers 1Г ... 39Г · s and grouping coils in a series 4 4 3 4 4 3 4 3 4 4 3 4 3, repeated 3 · s times: in the first group 1G ... 13G, the concentric coils have groove steps at _pi = 8, 6, 4, 2 s (1-x) w _k , (1 + x ) w _to , w _to , (1-x) w _to turns in groups of four- _coil and y ' _pi = 7, 5, 3 with w _to , (1 + x) w _to , w _to turns in four-coil at a value of x = 0 , 58. The indicated distributions of unequal coils are repeated in each subsequent grouping, where c = 1, 2, 3; 2w _to - the number of turns of the grooves, completely filled with a winding.

Figure 1 shows a scan of the groove layers of the proposed winding with c = 1 and z = 141 for 2p = 22 with groups 1G ... 33G (numbered above) for z '= z / 3 = 47 grooves with numbers 1 ... 47 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-6x) 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 19G; 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 is 16G, z _e = 3 (N-3x). Such m ′ = 3-zone windings of FIG. 1, FIG. 5 are connected by series-consonant inclusion of 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 = 282.

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 = 6, y, τ _p = z / 2p = 141/22, the distribution of K _p = sin (60 °) / Nsin60 ° / N is equal to K _about = K _at K _p = 0,82291; when x ≠ 0 is added to the K value _about neravnovitkovosti coils defined by _claim 2, when α = 360 ° / z = 120 ° / 47: -x (0,637081 + 0,470783) (1 + 2cosα _n) = - x3.3214 for 19G + 1G + 4G, x2 (0.98953-0.670785) (cos0.5α _n + cos1.5α _n + cos2.5α _n + cos3.5α _n ) = x2.6105 for 7G + 31G + 10G + 28g + 13D + 25G + 16G + _yi 22g when K = 0.637081 (y _pi = 10) .470783 (y _pi = 2) 0.98953 (y _'pi = 7) 0.670785 ( y ' _pi = 3), K _about N = 38.6767, ∑х = -0.7009 and 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 = 47 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 = 0.43 is calculated, corresponding to σ _{d% min} : K _rev = 0.86392, R ² _d = 536, 1761/47, R _o = 133.26 · 0.86392 / 11π and σ _{d% min} = 2.79 for z _e = 3 (N-6x) = 3 · 44.42 = 133.26, and at x = 0-σ _d% = 5.88, i.e. the value of σ _{d% of the} winding of Fig. 1 decreases by 5.88 / 2.79 = 2.11 times, and taking into account the increase in K _, its efficiency is K _eff = (0.86392 / 0.82291) (5.88 / 2 79) z _e / z = 2.10.

Similarly, in Fig. 5 ... 8 for 2p = 26: K _about = (38.5804 + x0.59594) / (47-3x), R ² _d = (410-10x + 56x ² ) / 47 and at x _opt = 0.58-K _r = 0.8858, σ _{d% min} = 3.80 for z _e = 3 (N-3x) · 3 · 44.26 = 135.88, and at x = 0-σ _d% = 8.62, i.e. σ _{d% of the} winding of FIG. 5 decreases by 8.62 / 3.80 = 2.27 times due to the elimination of harmonic MDS ν = _1/13 and K _eff = 2.36.

Compared with m '= 6-zone windings at 2p = 26, z = 141, q = z / 6p = 47/22 and 47/26, the proposed m' = 3-zone windings have a reduced σ _d% and are much simpler to manufacture due to half the number (3p) of coil groups.

The application of the proposed winding on the stator HELL allows you to reduce additional losses in steel and moments from harmonic fields, to improve vibration and acoustic 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 electromachine winding in z = 141 · c grooves at 2р = 22 · с poles with the number of grooves per pole and phase q = z / 3p = 47/11, made of 3Р · с coil groups with numbers from 1Г to 33Г · With and grouping coils in a series of 5 4 4 5 4 4 4 5 4 4 4, repeated 3 · s times, characterized in that in the first group 1G ... 11G concentric coils have _groove steps in the grooves at _pi = 10, 8, 6, 4, 2 s (1-x) w _k , w _k , w _k , w _k , (1-x) w _k turns in groups of five-coil and y ' _pi = 9, 7, 5, 3 s w _k , (1 + x) w _to , w _to (1-x) w _to turns in four-coil at a value of x = 0.43, and this distribution of non-uniform coils is repeated are 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 = 141 · with grooves at 2р = 26 · with poles with the number of grooves per pole and phase q = z / 3p = 47/13, made of 3Р · s coil groups with numbers from 1Г to 39Г · With and grouping coils in a series of 4 4 3 4 4 3 4 3 4 4 3 4 3, repeated 3 · s times, characterized in that in the first group 1G ... 13G, concentric coils have groove steps at _pi = 8, 6, 4, 2 s (1-x) w _k , (1 + x) w _k , w _k , (1-x) w _k turns in groups of four- _coil and y ' _pi = 7, 5, 3 s w _k , (1 + x) w _a, w _a three-coil windings into a value of x = 0.58, and this distribution is repeated in neravnovitkovyh coils to zhdoy subsequent grouping, where c = 1, 2, 3, 2w _k - number of slots turns completely filled winding.

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