RU2335063C2 - ELECTRIC MACHINE THREE-PHASE DOUBLE-LAYER WINDING WITH z=135·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=45/11 and q=45/13) poles. For this, the three-phase machine winding and z=135c slots feature the following, i.e. 1) at 2p=22·c poles with the number of slots per a pole and phase q=z/3p=45/11 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 54444444444 repeated 5c times in the first group 1"Г"...11"Г" wherein coils feature the pitch over the slots as follows, i.e. y_si=10, 8, 6, 4, 2 with (1-x)w_c, w_c, w_c, w_c, (1-x)w_c turns in 1"Г", y'_si=9, 7, 5, 3 with w_c, (1+x)w_c, w_c, (1-x)w_c in 6"Г",7"Г", y'_si=6, 6, 6, 6 with w_c, (1+x)w_c, w_c, (1-x)w_c in 2"Г", 3"Г", 4"Г", 5"Г" and with (1-x)w_c, w_c, (1+x)w_c, w_c in 8"Г", 9"Г", 10"Г", 11"Г" at x=0.48; 2) at 2p=26·c poles that feature the number of slots per a pole and phase q=z/3p=45/13 is made up of 3p c coil groups with numbers from 1 "Г" to 39"Г" c and the coils groups in the series 4343434343433 repeated 3 times in the first group 1"Г"...13"Г", i.e. the coils feature the pitch over the slots y_si=8, 6, 4, 2 with (1-x)w_c, w_c, w_c, (1-x)w_c turns in 1"Г", 11"Г" and (1-x)w_c, (1+x)w_c, w_c, (1-x)w_c in 3"Г", 5"Г", 7"Г", 9"Г", y'_si=7, 5, 3 with w_c, (1+x)w_c, w_c turns at the rest groups at x=0.44. 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 coil turns 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, 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 _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, p. 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 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 = 135 · c grooves at 2p = 22 · s and 2p = 26 · s poles performed with q = z / 3p = 45 / p (N = 45 ) from 3p · s groups by known groups [Livshits-Garik M. Windings of AC machines. / Transl. 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 = 135 · with grooves: 1) at 2p = 22 · with poles with the number of grooves per pole and phase q = 45/11, made of 3p · from the coil groups with numbers 1Г ... 33Г · s and the grouping of coils in a row 5 4 4 4 4 4 4 4 4 4 4 4 repeated 3 · s times: in the first group 1 G ... 11 G the coils have groove steps y _pi = 10, 8, 6, 4, 2 s (1-x) w _k , w _k , w _k , w _k , (1-x) w _k turns in 1Г, у _pi = 9, 7, 5 , 3 w _k (1 + x) w _k, w _k, (1-x) w _k in 6G, 7G, y _'pi = 6, 6, 6, 6 w _k (1 + x) w _k , w _k , (1-x) w _k in 2G, 3G, 4G, 5G and s (1-x) w _k , w _k, (1 + x) w _k , w _k in 8G, 9G, 10G, 11G with a value of x = 0.48;

2) at 2p = 26 · s poles with the number of grooves per pole and phase q = 45/13, made of 3p · s coil groups with numbers 1G ... 39G · s and grouping coils in a series 4 3 4 3 4 3 4 3 4 3 4 3 3 repeated 3 · s times: in the first group 1G ... 13G, the coils have groove steps y _pi = 8, 6, 4, 2 s (1-x) w _k , w _k , w _k , (1-x) w _to turns in 1G, 11G and (1-x) w _to , (1 + x) w _to , w _to , (1-x) w _to 3G, 5G, 7G, 9G, y ′ _Pi = 7, 5, 3 with w _k , (1 + x) w _k , w _k turns in the remaining groups with the value x = 0.44. 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 = 135 for 2p = 22 with groups 1G ... 33G (numbered above) for z = z / 3 = 45 grooves with numbers 1 ... 45 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-2x) 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 1G; Figures 3 and 4 along a triangular grid with its side per unit length are constructed polygons of the MDS winding of figure 1 at x = 0 (Fig. 3) and x = 0.5 (Fig. 4). Figure 5 ... 8 shows the same as figure 1 ... 4, but for winding at 2p = 26, the axis of symmetry in 19G, z _e = 3 (Nx). Such m '= 3-zone windings of FIGS. 1 and 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 = 270.

For winding 1, ravnovitkovoy (x = 0) _of the winding factor K by shortening K coefficients _y = sin (90 ° _{to the} y / τ _n) for _k = 6, y, τ _p = z / 2p = 135/22, the distribution of K _p = sin (60 °) / Nsin60 ° / N is equal to K _about = K _y K _p = 0,82656; when x ≠ 0, the value of non-uniformity of the coils, determined by FIG. 2, is added to K _about , when α _p = 360 ° / z = 8 ° / 3: -x (0.54951-0.99939 + 0.48989) = - x1 , 0394 to 1D, x2 (0,975662-0,694658) cos0,5 · α _n = h0,56186 to 7D + 28g, x0,99939 [cos (1,5-5,5) α _n -cos (1 5 + 16.5) α _p + cos (2.5-5.5) α _p -cos (2.5 + 16.5) α _p + cos (3.5-5.5) α _p - cos (3.5 + 16.5) α _p + cos (4.5-5.5) α _p -cos (4.5 + 16.5) α _p ] = + x 3.01469 for 4G + 31G + 10G + 25G + 13G + 22G + 16G + 19G at K _yi = 0.54951 (y _pi = 10), 0.99939 (at _pi = 6), 0.48989 (at _pi = 2), 0.975662 (y ′ _pi = 7), 0.694658 (y ′ _pi = 3), K _about N = 37.1954, Σx = + 2.53715 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 = 45 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 = 0.48 is calculated, corresponding to σ _{d% min} : K _rev = 87224, R ² _d = 514.3536 / 45, R _o = 132.12 · 0.87224 / 11π and σ _{d% min} = 2.78 for z _e = 3 (N-2x) = 3 · 44.04 = 132.12, and at x = 0- σ _d% = 5.50, i.e. the value of σ _{d% of the} winding, Fig. 1, decreases by 5.50 / 2.78 = 1.98 times, and taking into account the increase in K _, its efficiency is K _eff = (0.87224 / 0.82656) (5.50 / 2.78) z _e / z = 2.04.

Similarly, in Fig. 5 ... 8 for 2p = 26: K _about = (37.1551 + x3.4817) / (45-x), R ² _d = (З66-6х + 84х ² ) / 45 and at x _opt = 0.44-K _rev = 0.8682 and σ _{d% min} = 4.46 for z _e = 3 (Nx) = 3 · 44.56 = 133.68, and at x = 0-σ _d% = 9.19, i.e. σ _{d% of the} winding of FIG. 5 decreases by 9.19 / 4.46 = 2.06 times due to elimination of harmonic MDS ν = _1/13 at K _eff = 2.15.

Compared with m = 6-zone windings at 2p = 26, z = 135, q = z / 6p = 45/22 and 45/26, 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.

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, cosφ1, and in synchronous generators it improves the shape of the output voltage curve.

Claims (2)

1. Three-phase two-layer electromachine winding in z = 135 · c grooves at 2p = 22 · s poles with the number of grooves per pole and phase q = z / 3p = 45/11, made of 3p · s coil groups with numbers from 1G to 33G · With and grouping coils in a row 5 4 4 4 4 4 4 4 4 4 4 4 repeated 3 · c times, characterized in that in the first group 1G ... 11G coils have steps in the grooves y _pi = 10, 8, 6 4, 2 s (1-x) w _k , w _k , w _k , w _k (1-x) w _k turns in 1G, y ' _pi = 9, 7, 5, 3 s w _k , (1+ x) w _k , w _k , (1-x) w _k in 6Г, 7Г, у ' _ni = 6, 6, 6, 6 with w _к , (1 + x) w _к , w _к , (1-x ) w _k in 2G, 3G, 4G, 5G and s (1-x) w _k , w _k , (1 + x) w _k , w _k in 8G, 9G, 10G, 11G with x = 0.48, and such a distribution is unequal 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. 2. Three-phase two-layer electromachine winding in z = 135 · with grooves at 2р = 26 · with poles with the number of grooves per pole and phase q = z / 3p = 45/13, made of 3Р from coil groups with numbers from 1Г to 39Г · c and the grouping of coils in a series of 4 3 4 3 4 3 4 3 4 3 4 3 3, repeated 3 · s times, characterized in that in the first group of 1G ... 13G coils have groove steps in _pi = 8, 6, 4, 2 s (1-x) w _to , w _to , w _to , (1-x) w _to turns in 1G, 11G and (1-x) w _to , (1 + x) w _to , w _to , (1-x) w _k in 3G, 5G, 7G, 9G, y ' _pi = 7, 5, 3 s w _k (1 + x) w _k , w _k turns in the remaining groups with the value x = 0.44, and such a distribution of unequal coils is repeated in each osleduyuschey grouping, where c = 1, 2, 3; 2w _to - the number of turns of the grooves, completely filled with a winding.

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