RU2335071C2 - ELECTRIC MACHINE THREE-PHASE DOUBLE-LAYER WINDING IN z=180·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 (q=60/11 and q=60/13) with m'=3-section. A three-phase double-layer winding laid in z=180c slots, i.e. 1) at 2p=22·poles with the number of slots per a pole and phase q=z/3p=60/11 is made up of 3p·c coil groups with numbers from 1 "Г" to 33 "Г" c and coils' group in the series 65656565655 repeated 3·c times, in the first group 1"Г"...11"Г" the concentric coils feature the pitch over the slots y_si=13-2(i-1) group of six- and y'_si=12-2(i'-1) five-coils with the number of coil turns (1-x)W_c i=1, 6, (1+x)W_c coils group i=3 group 3"Г", 5"Г", 7"Г" and coils i'=3 with turns w_c of the other coils of this group and with x=0.43; 2) at 2p=26·c poles with the number of slots per a pole and phase q=z/3p=60/13 is made up of 3p·c coil groups with numbers from 1 "Г" to 39"Г" c and coil group in the series 5545545455454 repeated 3 times, in the first group 1"Г"...13"Г" concentric coils feature the pitch over slots y_si=11-2(i-1) of the group of five- and y'_si=10-2(i'-1) four-coil with the number of coil turns (1-x)w_c i=1, 5, (1+x)W_c of coils i=3 and i'=3 at W_c turns of the other coils' groups and x=0.57, where c=1, 2, 3; i and i' is the numbers of coil groups starting from external coils, 2w_c is a number of slots filled completely with a winding. The aforesaid distributions of coils with unequal number of turns are repeated in every following group.

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 symmetric m = 3-phase. 2p-pole windings performed in z grooves from m'p coil groups with coils of equal steps or concentric with an average pitch of grooves y _to ≈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 with q = z / m'p = N / d and d≥2 not multiple of m = 3 create harmonic MDS 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 harmonic ν> 0 for forward (+) or counter (-) rotation.

The invention seeks to reduce the differential scattering m '= 3-zone winding in z = 180 ) of 3 r · c groups according to known groupings [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 = 180 · with grooves: 1) at 2р = 22 · with poles with the number of grooves per pole and phase q = 60/11, made of 3Р · from the coil groups with numbers 1Г ... 33Г · s and the grouping of coils in a row 6 6 5 6 6 5 6 6 5 6 5: repeated 3 · s times: in the first group 1Г ... 11Г concentric coils have steps along the grooves y _pi = 13-2 (i-1) for groups of six- and y ' _pi = 12-2 (i'-1) five-coil with the number of turns (1-x) w _{to the} coils i = 1,6, (1 + x ) w _{to the} coils i = 3 of groups 3G, 5G, 7G and coils i '= 3 with w _{to the} turns of the other coils of the groups and the value x = 0.43;

2) at 2p = 26 · c poles with the number of grooves per pole and phase with q = 60/13, made of 3 · p from the coil groups with numbers 1Г ... 39Г · s and the grouping of coils in a row 5 5 5 5 4 5 5 5 4 5 5 5 4, repeated 3 · s times: in the first group 1G ... 13G, the concentric coils have groove steps for _pi = 11-2 (i-1) groups of five- and y ' _pi 10-2 (i'-1) four-coil with the number of turns (1-x) w _{to the} coils i = 1,5, (1 + x) w _{to the} coils i = i '= 3 with w _{to the} turns of the other coils of the group and the value x = 0 , 57, where c = 1, 2, 3; i and i '- numbers of coils of groups, starting from the outer, 2w _to - the number of turns of grooves, completely filled with a 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 = 180 for 2p = 22 with groups 1G ... 33G (numbered above) for z = z / 3 = 60 grooves with numbers 1 ... 60 from the bottom , by alternating phase zones in the sequence ABC, XYZ in the upper and lower layer, where the blackened grooves are incomplete when the equivalent Z _e = 3 (Nx) 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 16G; in figure 3, 4 on a triangular grid with its side per unit length, the polygons of the MDS winding of figure 1 are constructed at 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 and z _e = 3 (N-3x). 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 = 360.

For winding 1 ravnovitkovoy (x = 0) _of the winding factor K kooeffitsientam by shortening K _y = sin (90 ° _{to the} y / τ _n) for _k = 8, y, τ _p = z / 2p = 90/11 and the distribution of K _p = sin (60 °) / Nsin60 ° / N is equal to K _rev = K _y K _p = 0.82653, and when x ≠ 0, the value of non-uniformity of the coils, determined by figure 2 at α _p = 360 ° /, is added to K _rev z = 2.0 °: -x2 (0.60182 + 0.54464) cos2α _n = -x2.287323 for 1Г + 31Г, -х (0.60182-0.987688 +0.54464) (1 + 2cosα _п ) = - x0.47610 for 16G + 7G + 25G, 2x0.999391 (cos0.5α _p + cos1.5α _p + cos2.5α _p ) = + x5.985695 for 4G + 28G + 10G + 22G + 13G + 19G at K _yi = 0.60182 (y _pi = 13, i = 1), 0.987688 (at _pi = 3, i = 3), 0.54464 (at _pi = 3, i = 6), 0.999391 (y ' _pi = 8, i' = 3) and K _about N = 49.59189, Σx = + 3.2223, 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 = 60 groove points, R _o and K _rev are for the 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 = 0.85576, R ² _d = 1197, 2174/60, R _o = 178.71 · 0.85576 / 11π and σ _{d% min} = 1.88 for z _e = 3 (Nx) = 3 · 59.57 = 178.71, and at x = 0- σ _d% = 3.86, i.e. the value of σ _{d% of the} winding of FIG. 1 decreases by 3.86 / 1.88 = 2.05 times, and taking into account the increase in K _, its efficiency is K _eff = (0.85576 / 0.82653) (3.86 / 1 88) z _e / z = 2.11.

Similarly, in Fig. 5 ... 8 for 2p = 26: K _rev = (49.6146 + x3.0404) / (60-3x), R ² _d = (840 + 8x + 84x ² ) / 60 and at x _opt = 0.57-K _rev = 0.8809, σ _{d% min} = 2.14 for z _e = 3 (N-3x) = 3 · 58.29 = 174.87, and at x = 0-σ _d% = 5.4, i.e. σ _{d% of the} winding of FIG. 5 decreases by 5.40 / 2.14 = 2.5 times due to the elimination of harmonic MDS ν = 1/13; K _eff = 2.61. Compared with m '= 6-winding band when 2p = 26, z = 180, q = z / 6p = 30/13, y _k = 5 and K = 0.8655 and _about σ _d% = 3,09, m '= 3-zone winding has a reduced σ _d% of 3.09 / 2.14 = 1.44 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 electromachine winding in z = 180 · c grooves at 2p = 22 · s poles with the number of grooves per pole and phase q = z / 3p = 60/11, made of 3p · s coil groups with numbers from 1G to 33G · With and the grouping of coils in a series of 6 5 6 5 6 5 6 5 6 5 5, repeated 3 · s times, characterized in that in the first group 1G ... 11G, concentric coils have _groove steps at _pi = 13-2 ( i-1) groups of six- and у ' _пi = 12-2 (i'-1) five-coil with the number of turns (1-x) w _to coils i = 1, 6, (1 + x) w _to coils i = 3 groups 3G, 5G, 7G and coils i '= 3 at w _{to the} turns of the remaining coils of the groups, and this distribution is unequal output coils is repeated in each subsequent grouping, where c = 1, 2, 3; i = 1 ... 6 and i '= 1 ... 5 is the number of the coil in the group, starting with the outer one, and 2w is _the number of turns completely filled with the winding of the grooves and the value x = 0.43. 2. Three-phase two-layer electromachine winding in z = 180 · with grooves at 2р = 26 · with poles with the number of grooves per pole and phase q = z / 3p = 60/13, made of 3Р · from coil groups with numbers from 1Г to 39Г · With and the grouping of coils in a series of 5 5 4 5 5 4 5 4 5 5 4 5 4, repeated 3 · c times, characterized in that in the first group 1G ... 13G, the concentric coils have groove steps at _pi = 11- 2 (i-1) groups of five- and y ' _pi = 10-2 (i'-1) four-coil with the number of turns (ix) w _to coils i = 1, 5, (1 + x) w _to coils i = i 'w = 3, with the remaining coils _to coils of groups, wherein such allocation neravnovitkovyh coils repeating tsya in each successive grouping, where c = 1, 2, 3; i = 1 ... 5 and i '= - 1 ... 4 is the number of the coil in the group, starting with the outer one, and 2w _k is the number of turns of the grooves completely filled by the winding and the value x = 0.57.

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