RU2335076C2 - ELECTRIC MACHINE THREE-PHASE DOUBLE-LAYER WINDING IN z=177·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=59/11 and q=59/13). The invention novelty consists in that the aforesaid winding is made in z=177·c slots at 2p=22·c poles with the number of slots per a pole and phase q=59/11 up of 3p·c coil groups with the numbers 1"Г"...33"Г"·c and the coil group in the series 6 5 6 5 5 6 5 5 6 5 5 repeated 3·c times. Note, that in compliance with the first version, in the first group 1"Г"...11"Г", the group coils feature the pitch over the slots y=13-2 (i-1) four six-coil groups and y'=12-2 (i'-1) for five-coil groups with the number of turns as follows, i.e. (1-x)w_c in coils i=1, 6; (1+x)w_c in coils i'=3 and w_c turns in the remaining coil groups at x=0.38. In compliance with the second version, the proposed winding is made in z=177·c slots at 2p=26·c poles with the number of clots per a phase and pole q=59/13 from 3p·c coil groups with the numbers 1"Г"...39"Г"·c and the coil group in the series 5 5 4 5 4 5 4 5 4 5 4 5 4, repeated 3·c times. Note that in the first group 1"Г"...13"Г", the group coils feature the pitch over slots y=11-2(i-1) for five-coil groups and y'=10-2(i'-1) for four-coil groups with the number of turns as follows, i.e. for four-coil groups with the number of turns (1-x)w in coils i=1, 5; (1+x)w_c in coils i=i^'=3 and w turns in the remaining coil groups at x=0.55. 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 = 177 · s grooves at 2p = 22 · s, 2p = 26 · c poles, performed with q = z / 3p = 59 / p (N = 59 ) from 3p · from coil groups according to known groupings of coils in groups [Livshits-Garik M. Windings of alternating current machines / Transl. from English L .: SEI, 1959, p.225], repeated 3 · s times.

The solution of this problem is achieved by the fact that for m = 3-phase two-layer electric machine winding in z = 177 · c grooves: 1) at 2p = 22 · c poles with the number of grooves per pole and phase q = 59/11, made of 3р · from the coil groups with numbers 1Г ... 33Г · s and grouping in a row 65655655655: in the first grouping 1Г ... 11Г, the coils have _groove steps at _pi = 13-2 (i-1) for six- and у ' _pi = 12-2 (i'-1) for five-coil groups with the number of turns (1) w _k in coils i = 1,6, (1 + x) w _k in coils i '= 3 and w _to coils in other coils groups at x = 0.38;

2) at 2p = 26 · with poles with the number of grooves per pole and phase q = 59/13, made of 3p · from coil groups with numbers 1G ... 39G · s and grouping in a row 5545454545454: in the first group 1G .. .13Г coils have groove steps for _pi = 11-2 (i-1) for five- and y ' _pi = 10-2 (i'-1) for four-coil groups with the number of turns (1-x) w _k in the coils i = 1.5, (1 + x) w _x in the coils i = i '= 3 and w _{to the} turns in the remaining coils of the groups with the value x = 0.55. Such distributions of unequal coils are repeated in each subsequent grouping, where c = 1, 2, 3; i and i 'are the numbers of concentric coils in groups, starting from the outer, and 2w _k is the number of turns of the grooves completely filled with the winding.

Figure 1 shows a scan of the groove layers of the proposed winding with c = 1 and z = 177, 2p = 22 with groups 1G ... 33G (numbered above) for z '= z / 3 = 59 grooves with numbers 1 ... 59 below, by alternating phase zones in the sequence ABC and XYZ in the upper and lower layers, where the blackened grooves are incomplete with equivalent z _e = 3 (N-x) completely filled grooves; figure 2 shows a diagram of the shifts of the axes of the groups of zones A relative to the axis of symmetry 13G and figure 3, 4 on a triangular grid with its side per unit length constructed polygons MDS winding according to figure 1 with x = 0 (figure 3) = 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 34G, z _e = 3 (Nx). Such m ′ = 3-zone windings of FIGS. 1, 5 are connected when series groups of zones A, B, C are connected in phases I, II, III, and the phases can be mated in Y or Δ; with, for example, c = 2-z = 354 with 2p = 44 and 2p = 52.

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 = 8, y, τ _p = z / 2p = 177/22, the distribution of K _p sin (60 °) / Nsin60 ° / N is equal to K _about = K _at K _p = 0.8270; when x ≠ 0 is added to the K value _about neravnovitkovosti coils defined by _claim 2, when α = 360 ° / z = 120 ° / 59: -2x (0,56750 + 0,55280) ( cos0,5 = α _n + cos1.5α _n ) = - x4.4777 for 1G + 25G + 28G + 31G, x0.999961 (1 + 2cosα _n + 2cos2α _n + 2cos3α _n ) = x6.9821 for 13G + 4G + 22G + 7G + 19G + 10G + 16G at K _yi = 0.5675 (y _pi = 13, i = 1), 0.5528 (y _pi = 3, i = 6), 0.999961 (y ' _pi = 8, i' = 3), To _both N = 48.7933 and Σx = + 2.5044, 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 = 59 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 = 0.38 is calculated, corresponding to σ _{d% min} : K _rev = 0.8486, R ² _d = 1120, 3908/59, R _o = 175.86 · 0.8486 / 11π, σ _{d% min} = 1.83 for z _e = 3 (Nx) = 3 · 58.62 = 175.86, and at x = 0- σ _d% = 3.92, i.e. the value of σ _{d% of the} winding of FIG. 1 decreases by 3.92 / 1.83 = 2.14 times (due to the elimination of harmonic MDS ν = 1/11), and taking into account changes in K _about and z _e its efficiency is K _eff = (0.8486 / 0.8270) (3.92 / 1.83) z _e / z = 2.18.

Similarly, in Fig. 5 ... 8 for 2p = 26: K _rev = (48.7472 + x4.4418) / (59th), R ² _d = (800 + 46x + 93x ² ) / 59 and for x _opt = 0.55-K _r = 0.8758 and σ _{d% min} = 2.30 for z _e = 3 (Nx) = 3 · 58.45 = 175.35, and at x = 0 - σ _d% = 5.75, i.e. σ _{d% of the} winding of FIG. 5 decreases by 5.75 / 2.30 = 2.50 times with the efficiency coefficient K _eff = 2.62.

Compared with m '= 6-zone windings at z = 177, q = z / 6p = 59/22 and 59/26, the proposed m' = 3-zone windings have lower σ _d% and are much simpler to manufacture due to half as much 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 MDS 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 electromachine winding in z = 177 · with grooves at 2р = 22 · with poles with the number of grooves per pole and phase q = z / 3p = 59/11, made of 3Р · s coil groups with numbers from 1Г to 33Г · With and the grouping of coils in a series of 6 5 6 5 5 6 5 5 6 5 5, repeated 3 · s times, characterized in that in the first group 1G ... 11G the coils of the groups have _groove steps at _pi = 13-2 ( i-1) for six - and y ' _pi = 12-2 (i'-1) for five-coil with the number of turns: (1-x) w _k in the coils i = 1, 6; (1 + x) w _k in the coils i '= 3 and w _k turns in the remaining coils of the groups with a value of x = 0.38, and this distribution of non-coils is repeated in each subsequent grouping, where c = 1, 2, 3; i = 1 ... 6 and i '= 1 ... 5 are the numbers of concentric coils of the groups, starting from the outer one, and 2w _k is the number of turns of the grooves completely filled with the winding. 2. Three-phase two-layer electromachine winding in z = 177 · with grooves at 2р = 26 · with poles with the number of grooves per pole and phase q = z / 3p = 59/13, made from Зр · from coil groups with numbers from 1Г to 39Г · With and grouping coils in a series of 5 5 4 5 4 5 4 5 4 5 4 5 4, repeated 3 · c times, characterized in that in the first group 1G ... 13G, the coils of the groups have groove steps in _pi = 11 = 2 (i-1) for five - and y ' _pi = 10-2 (i-1) for four- _coil with the number of turns: (ix) w _to in the coils i = 1, 5; (1 + x) w _k in the coils i = i '= 3 and w _k turns in the remaining coils of the groups with a value of x = 0.55, and this distribution of unequal coils is repeated in each subsequent grouping, where c = 1, 2, 3 ; i = 1 ... 5 and i '= 1 ... 4 are the numbers of concentric coils in the groups, starting from the outer one, and 2w _к is the number of turns of the slots completely filled with the winding.

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