RU2268535C2 - THREE-PHASED TWO-LAYERED ELECTRO-MECHANICAL WINDING WITH 2p=14c POLES WITHIN z=48c GROOVES - Google Patents

Abstract

FIELD: electric engineering, possible use for technologies of electro-mechanical engineering, engineering and production of three-phased asynchronous and synchronous devices.

SUBSTANCE: three-phased two-layered electro-mechanical winding having 2p=14c poles within z=48c grooves with grouping of coils in accordance with row 3 2 2 3 2 2 2, repeated further for 3c times, is made of 3p=21c coil groups with numbers 1Γ,... 21(c)Γ, with serial and matching connection of groups in phases and average step of concentric coils across grooves being equal to value y_c=3. In accordance to the invention, in first grouping 1Γ,...7Γ groups 1Γ,4Γ,5Γ,7Γ with groove step value being equal to y_g=3 groups 1Γ,4Γ have (1-x)w_c, w_c, (1-x)w_c coils each, group 5Γ has (1+x)w_c, w_c coils, group 7Γ has w_c, (1+x)w_c coils, and concentric groups 2Γ,3Γ,6Γ with groove step values being equal to y_gi=4,2 groups 2Γ,3Γ have (1+x)w_c, w_c coils, group 6Γ - (1+x)w_c, (1-x)w_c coils. Distribution of not even-coiled coils with coils unevenness coefficient being equal to value x=0,38, as described in detail above, is repeated for each following grouping of coils in accordance with aforementioned row, while c=1,2,3.

EFFECT: decreased differential dissipation.

4 dwg

Description

The invention relates to three-phase windings of electrical AC machines, can be used on a stator of three-phase asynchronous and synchronous machines, a phase rotor of asynchronous motors (HELL).

Loop double-layer symmetrical m = 3-phase windings are known, performed by 2-pole in z grooves from m'p coil groups with equal-step or concentric coils with their average step along grooves y _to ≈z / 2p and the number of grooves per pole and phase q = z / m'p whole or fractional, where m 'is the number of phase zones per pair of poles, equal to m' = m = 3-three-zone, or m '= 2m = 6-six-zone windings [Voldek A.I. Electric cars. L .: Energy, 1978, S. 392-393]. Fractional windings with q = z / m'p = N / d and d≥4 create harmonic MDSs in the series ν = m'k / d ± 1 [ibid, p. 450], including the lowest ones (ν <1 ) with a significant increase in differential scattering σ _d , where ± k is an integer giving the order of harmonic ν> 0 when it is forward (+), or counter (-) rotation.

The invention aims to reduce the differential scattering m '= 3-zone fractional symmetrical winding at 2p = 14 · with poles, z = 48 · with grooves (q = z / 3p = 16/7, d = 7) with a group of coils in a row 3223222 [Livshits-Garik M. Windings of AC machines / Per. from English M.-L .: SEI, 1959, p.224], equivalent to m '= 6-zone winding with q' = z / 6p = q / 2 = 8/7 with the grouping 2111111, but it is easier because of half the size number of groups.

The solution of this problem is achieved by the fact that for a three-phase 2-layer winding at 2p = 14 · s, z = 48 · s with a group of 3223222, repeated 3 · s times, performed from 3p = 21 · s of the coil groups with numbers 1Г .. .21 (s) D at the average step of the coils in the grooves y _k = 3: in groups 1G ... 7G of the first grouping, groups 1G, 4G, 5G, 7G at step y _p = 3 have the number of turns (1-x) w _to , w _k , (1-x) w _k for 1G, 4G, (1 + x) w _k , w _k for 5G and w _k , (1 + x) w _k for 7G, and concentric groups 2G, 3G, 6G at steps y _pi = 4, 2 have the number of turns (1 + x) w _k , w _k for 2G, 3G, (1 + x) w _k , (1-x) w _k for 6G and the indicated distribution of unequal coils repeat appears in each subsequent grouping, where c = 1, 2, 3, ..., 2w _k is the number of turns of each groove and x = 0.38.

Figure 1 shows a scan of the groove layers of the proposed winding with c = 1, 2p = 14, z = 48 with numbers 1 ... 48 and the numbers of coil groups from 1G to 21G (marked groups 1G, 4G, 7G, 10G, 13G, 16G, 19G of the first phase), by alternating phase zones in the sequence ABC of the upper, X, Y, Z lower layers; figure 2 shows a diagram of the shift of the axes of the groups of the first phase, and figure 3, 4 are built on a triangular grid polygons of the MDS winding of figure 1 at x = 0 (figure 3) and x = 0.5 (figure 4). Such an m '= 3-zone winding is connected in the usual way by sequentially switching on groups in phases with their beginnings from the beginning of groups 1G, 8G, 15G for phases I, II, III and phases can be conjugated by a star or a triangle. With c = 2, 3, ... the winding has 2p = 14s = 28, 42, ... poles with z = 48c = 96, 144, ... grooves.

1 for winding the winding coils ravnovitkovyh coefficient (x = 0) by shortening K coefficients _y = sin (90 ° _{to the} y / τ _n) for y = 3 _{to n} and τ = z / 2p = 24/7 allocation K _p = sin (60 °) / Nsin (60 ° / N) is equal to K _about.o = K _at K _p = 0.81163. For unequal coils, a value depending on the non- _uniformity index x of the phase groups in Fig. 2 is added to K _ob.o with a symmetry axis of 13G and a groove shift angle α _n = 360 ° / z = 7.5 °: x (0.965926- 0.793353) = + x0.1725725 for 13G, -x0.980785 · 2 [cos (0.5α _n + 7α _n ) + cos (0.5α _n -7α _n )] = - x2.3831436 for 1G + 14G , х0.965926 · 2cosα _p = + х1.9153244 for 10Г + 16Г, х0.980785 · 2cos (2-3.5) α _p = + х1.9238795 for 7Г + 19Г at K _yi = sin (90 ° y _pi / τ _p ) = 0.965926 (y _pi = 4), 0.793353 (at _pi = 2), 0.980785 (at _p = 3), then Σx / 16 = + x0.10790 and K _about is equal to:

From the MDS polygons of FIGS. 3 and 4 (in the center, the unit current vectors of the phase zones A-Z-B-X-C-Y are shown) is determined by the relations

differential scattering coefficient σ _d , characterizing the quality of the winding by the harmonic composition of its MDS, where R ² _d is the square of the average radius j = 1 ... N of the groove points, R _o is the radius of the circle for harmonic ν = 1 [Popov V.I. Determination and optimization of the parameters of three-phase windings along the MDS polygons // Electricity, 1997, No. 9, p. 53-55]:

then 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} ; at x _opt = 0.38-K _about = 0.85268, R ² d = 60.6384 / 16, R _o = 48 · 0.85268 / 7π and σ _{d% min} = 9.41, and at x = 0 -σ _d% = 19.47, i.e. σ _d% at x _opt = 0.38 decreases 19.47 / 9.41 = 2.07 times due to the elimination of the lowest ν = 1/7 harmonic MDS; taking into account the increase in K _{about the} efficiency of non-uniform winding is equal to K _eff = (0.85268 / 0.81168) (19.47 / 9.41) = 2.17.

Note that the m '= 6-zone winding at 2p = 14, z = 48, q = z / 6p = 8/7, and for _n = 3, the parameters correspond to K _ob = 0.9373, σ _d% = 13.50, those. the winding of figure 1 with x _opt = 0.38 exceeds it by 13.50 / 9.41 = 1.44 times.

Thus, the proposed m '= 3-zone winding is characterized by increased K _about , reduced σ _d% , and more effective in K _eff = 2.17 times in comparison with equal-turn; it is simpler than m '= 6-zone winding in manufacturability due to half the number (3p) of coil groups, it exceeds its differential scattering by 1.44 times.

Claims (1)

Three-phase two-layer electromachine winding at 2p = 14s poles in z = 48c grooves with a grouping of coils in a row 3223222, repeated 3s times, made of 3p = 21s coil groups with numbers 1G, ... 21 (s) G with sequentially-agreed inclusion in the phases of the groups and the average step of the coils in the grooves at _k = 3, characterized in that in the first group of groups 1G, ... 7G in groups 1G, 4G, 5G, 7G with a step in grooves at _n = 3 groups 1G, 4G have ( 1-x) w _to , w _to , (1-x) w _to turns, group 5G- (1 + x) w _to , w _to , turns, group 7G-w _to , (1 + x) w _to , turns , and in concentric groups 2G, 3G, 6G with steps along the grooves y _pi = 4, 2 groups 2G, 3G have (1 + x) w _k , w _k turns, the 6G group has (1 + x) w _k , (1-x) w _k turns, and the indicated distribution of unequal coils with an unequality coefficient x = 0.38 is repeated in each the subsequent grouping of coils in the specified row, with c = 1, 2, 3 ....

Images