RU2335073C2 - ELECTRIC MACHINE THREE-PHASE DOUBLE-LAYER WINDING IN z=144·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=48//11 and q=48/13). For this, the three-phase machine winding at 2p=22·c poles and with z=144c 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=48/11 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 54554554554 repeated 3·c times, i.e. in the first group 1"Г"...11"Г", the five-coil windings feature the coil pitch over the slots y_si= 11, 9, 7, 5, 3 with (1-x)w_c, w_c, w_c, w_c, (1-x)w_c turns, while the four-coil windings feature y_si = 10, 8, 6, 4 with w_c, w_c, (1+x)w_c, w_c turns at x=0.38, 2) at 2p=26·c poles with the number of slots per a phase and pole q=z/3p-48/13, the winding is made up of 3p·c coil groups with the numbers from 1"Г" to 39"Г" and the coil group in the series 4443443443443 repeated 3 c times, i.e. in the first group 1"Г"...13"Г", the four-coil windings feature the coil pitch over the slots y_si=9, 7, 5, 3 with (1-x)w_c, w_c, (1+x)w_c, (1-x)w_c turns, while the three-coil windings feature y'_si = 8, 6, 4 with w_c, (1+x)w_c, (1+x)w_c turns at x=0.40, where c=1, 2, 3,...; 2w_c is a number slot coils completely filled with 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 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, p.3 92-394]. Fractional windings with q = z / m'p = N / d and d≥2 not multiple of m = 3 create harmonic MDS in the series v = km '/ d ± 1 [ibid., P. 450], including lower v <1 with increasing differential scattering σ _d% , where ± k is an integer giving the order of harmonic v> 0 for forward (+) or counter (-) rotation.

The invention aims to reduce the differential scattering m '= 3-zone winding in z = 144 · c grooves at 2p = 22 · s and 2p = 26 · s poles, performed with q = z / 3p = 48 / p (N = 48 ) from 3p · s groups by well-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 = 144 · with grooves: 1) at 2p = 22 · with poles with the number of grooves per pole and phase q = 48/11, made of 3r · from the coil groups with numbers 1Г ... 33Г · s and the grouping of coils in a row 54554554554, repeated 3 · s times: in the first grouping 1Г ... 11Г groups of five-coil have the steps of the coils in grooves at _pi = 11, 9, 7, 5 , 3 s (1-x) w _k , w _k , w _k , w _k , (1-x) w _k turns, and four- _coil - y ' _pi = 10, 8, 6, 4 s w _k , w _k , (1 + x) w _to , w _to turns at x = 0.38;

2) at 2p = 26 · s poles with the number of grooves per pole and phase q = 48/13, made of 3p · s coil groups with numbers 1G ... 39G · s and grouping coils in a series 4443443443443, repeated 3 · s times : in the first grouping 1G ... 13G the four-coil groups have grooves in grooves at _pi = 9, 7, 5, 3 s (1-x) w _k , w _k , (1 + x) W _k , (1-x ) w _to turns, and three-coil at y ^' _pi = 8, 6, 4 s w _to , (1 + x) w _to , (1 + x) w _to , turns at x = 0.40, where c = 1 , 2, 3, ...; 2w _to - the number of turns of the 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 = 144 for 2p = 22 · with groups 1G ... 33G (numbered above) for z '= z / 3 = 48 grooves with numbers 1 ... 48 from the bottom, 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-x) 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 13G; 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 28G and z _e = 3 (Nx). 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 = 288.

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 = 7, y, τ _n = z / 2p = 72 / l1 and distribution K _p = sin (60) / Nsin60 ° / N is equal to K _ob = K _for K _p = 0.82214, and at x ≠ 0 to K _{ob is} added the value of the non-uniformity of the coils, determined according to Fig. 2 at α _p = 360 ° / z = 2.5 °: -x (0.480989 + 0.659346) (cos0.5α _p + cos1.5α _p ) = - x4.5559 for 1G + 25G + 28G + 31G, x0.991445 (1 + 2cosα _p + 2cos2α _n + 2cos3α _n) = - + h6,91372 to 13D + 4D + 7D + 22g + 19g + 10G + 16G when _yi = 0.480989 K (y _pi = 11) .659346 (y _pi = 6) , 0.991445 (y ' _pi = 6), K _about N = 39.46287, ∑x = + 2.35781 and

From the MDS polygons of FIGS. 3 and 4 (the unit vectors of the currents of the phase zones are shown in the center) according to the triangular grid and relations [Popov V. I. Definition and optimization of the parameters of three-phase windings by their MDS polygons // 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 = 48 groove points, R _o and K _rev are for harmonic v = 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 _dmin : K _rev = 0.84752, R ² _d = 605, 8824/48, R _o = 142.86 · 0.84752 / 11π, σ _{d% min} = 2.83 for z _e = 3 (N-4x) = 3 · 47.62 = 142.86, and at x = 0-σ _d% = 6.51, i.e., the value of σ _{d% of the} winding of Fig. 1 decreases by 6.51 / 2.83 = 2.30 times, and taking into account the increase in K _about, its efficiency is equal to K _eff = ( 0.84752 / 0.82214) (6.51 / 2.83) z _e / z = 2.35.

Similarly, in Fig. 5 ... 8 for 2p = 26: K _rev = (39.3592 + x4.72873) / (48-x), R ² _d = (438-12x + 146x ² ) / 48 and at x _opt = 0.4-K _rev = 0.8666, σ _{d% min} = 3.60 for z _e = 3 (Nx) -3 · 47.6 = 142.8, and at x = 0-σ _d% = 9.17, i.e. σ _{d% of the} winding of FIG. 5 decreases by 9.17 / 3.60 = 2.6 times due to elimination of harmonic MDS v = 1/13; K _eff = 2.67. Compared with m '= 6-zone winding at 2p = 26, z = 144, q = z / 6p = 24/13, for _k = 5, K _rev = 0.9439 and σ _d% = 5.33, m '= 3-zone winding has a reduced σ _d% , 5.33 / 3.60 = 1.48 times and 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 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 = 144 · c grooves at 2p = 22 · s poles with the number of grooves per pole and phase q = z / 3p = 48/11, made of 3p · s coil groups with numbers from 1G to 33G · With and the grouping of coils in a series of 5 4 5 5 4 5 5 4 5 5 4, repeated 3 · s times, characterized in that in the first group of 1G ... 11G groups of five-coil have the steps of the coils in grooves at _pi = 11, 9 , 7, 5, 3 s (1-x) w _k , w _k , w _k , w _k , (1-x) w _k turns, and four- _coil - y ' _pi = 10, 8, 6, 4 s w _k , w _k (1 + x) w _a, w _to a value of x = 0.38, and this distribution neravnovitkovyh coils is repeated in each subsequent GRU pirovke, where c = 1, 2, 3, ..., 2w _k - number of turns of winding is completely filled grooves. 2. Three-phase two-layer electric machine winding in z = 144 · c grooves at 2p = 26 · s poles with the number of grooves per pole and phase q = z / 3p = 48/13, made of 3p · s coil groups with numbers from 1G to 39G · With and grouping coils in a series of 4 4 4 3 4 4 3 4 4 3 4 4 3, repeated 3 · s times, characterized in that in the first group of 1G ... 13G four-coil groups have coil steps in grooves at _pi = 9 , 7, 5, 3 s (1-x) w _k , w _k , (1 + x) w _k , (1-x) w _k turns, and three-coil - y ' _pi = 8, 6, 4 s w _k , (1 + x) w _k , (1 + x) w _k turns at a value of x = 0.40, and such a distribution of unequal coils is repeated in each subsequent her group, where c = 1, 2, 3, ...; 2w _to - the number of turns of the grooves, completely filled with a winding.

Images