RU2268532C2 - THREE-PHASED TWO-LAYERED ELECTRO-MECHANICAL WINDING WITH 2p=14p POLES WITHIN z=54c 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=54c grooves with grouping of coils in accordance with row 3 3 2 3 2 3 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=4. In accordance to the invention, in first grouping 1Γ,...7Γ inner coils of groups 1Γ,2Γ,4Γ,6Γ with groove step values being equal to y_g=6,4,2 have (1-x)w_c coils each, and internal coils of groups 3Γ,5Γ,7Γ with groove step values being equal to y'_gi=5,3 have (1+x)w_c coils each, while remaining coils of groups have w_c coils each. Distribution of not even-coiled coils with coils unevenness coefficient being equal to value x=0,62, 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.

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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).

Known loop two-layer symmetrical m = 3-phase windings, 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'-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 with its direct (+) or counter (-) rotation.

The invention aims to reduce the differential scattering m '= 3-zone fractional symmetrical winding at 2p = 14s poles, z = 54s grooves (q = z / 3p = 18/7, d = 7) with a group of coils in a series of 3 3 2 3 2 3 2 [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 = 9/7 with the grouping 2112111, 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 = 14s, z = 54s with a group of 3 3 2 3 2 3 2, repeated 3s times, performed from 3p = 21s coil groups with numbers 1Г ... 21 (c) G with concentric coils at their average pitch along the grooves y _k = 4: in groups 1G ... 7G of the first grouping of groups 1G, 2G, 4G, 6G with steps y _m = 6, 4, 2 and 3G, 5G, 7G at y ' _pi = 5.3 have in the inner coil the number of turns (1-x) w _k for 1G, 2G, 4G, 6G and (1 + x) w _k for 3G, 5G, 7G with w _to turns in the rest coils of groups and the indicated distribution of unequal coils is repeated in each next grouping, where c = 1, 2, 3, ..., and x = 0.62.

Figure 1 shows a scan of the groove layers of the proposed winding with c = 1, 2p = 14, z = 54 with numbers 1 ... 54 and numbers of coil groups from 1G to 21G ... (groups 1G, 4G, 7G, 10G are marked , 13G, 16G, 19G of the first phase), by alternating phase zones in the sequence A-B-C of the upper, X, Y, Z lower layers, where the blackened grooves contain (2-x) w _to turns at 2w _to turns in the remaining grooves ; 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 with sequentially-consistent inclusion of groups in phases with their beginnings from the beginnings of groups 1G, 8G, 15G for I, II, III phases 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 = 54c = 108, 162, ... grooves.

For the winding of Fig. 1, the winding coefficient for equal-coil coils (x = 0) in terms of shortening coefficients K _y = sin (90 ° y _k / τ _p ) for y _k = 4 and τ _p = z / 2p = 27/7, distribution K _p = sin (60 °) / Nsin (60 ° / N) is equal to K _about.o = K _at K _p = 0.82606. For unequal coils, a value is added to K _r.o. , depending on the non- _uniformity index x of the phase groups in Fig. 2 with a symmetry axis of 19 D and a groove shift angle α _n = 360 ° / z = 20 ° / 3: x0.939693 (1+ 2cosα _n ) = + x 2.80637 for 19G + 7G + 10G, -x0.727374 · 2 (cos0.5α _n + cos1.5α _n ) = - x2.88493 for 1G + 16G + 4G + 13G at K _yi = sin (90 ° y _pi / τ _p ) = 0.727374 (y _pi = 2), 0.939693 (y ' _pi = 3), 0.998308 (y _pi = 4), then Σx = -x0.07856 and K _about when K _about.N = 14.86908 is equal to:

From the MDS polygons of FIGS. 3 and 4 (in the center, the unit vectors of the currents 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 = 0.62 is calculated, which corresponds to σ _{d% min} : for x _opt = 0.62-z _e = 3 (N-x) = 3 · 17.38 = 52.14 equivalent number of completely filled grooves, K _r = 0.85273, R ² _d = 79.8948 / 18, R _o = z _e K _r / pπ = 52, 14 · 0.85273 / 7π and σ _{d% min} = 8.59, and at x = 0 - σ _d% = 17.47, i.e. σ _d% at x _opt = 0.62 decreases by 17.47 / 8.59 = 2.03 times due to the elimination of the lowest ν = -1 / 7 harmonic MDS; taking into account K _about and z _{e, the} efficiency of the non-uniform winding is K _eff = (0.85273 / 0.82606) (17.47 / 8.59) (z _e / z) = 2.03.

Note that the m '= 6-zone winding at 2p = 14, z = 54, q = z / 6p = 9/7, and for _n = 3, the parameters K _ob = 0.8979, σ _d% = 9.72, those. the winding of figure 1 with x _opt = 0.62 exceeds it by 9.72 / 8.59 = 1.13 times.

Thus, the proposed m '= 3-zone winding is characterized by an increased K _rev , decreased σ _d% and more effective K _eff = 2.03 times in comparison with an equal-turn winding; it is simpler than m '= 6-zone winding in manufacturability due to the half as many (3p) coil groups, it exceeds its differential scattering by 1.13 times.

Claims (1)

Three-phase two-layer electric machine winding at 2p = 14s poles in z = 54c grooves with a grouping of concentric coils in a row 3 3 2 3 2 3 2, repeated 3s times, made of 3p = 21s coil groups with numbers 1G, ... 21 (s) T-consonant at successively switched in the phases and secondary groups of concentric coils of slots at step _k = 4, characterized in that the first grouping groups 1G ... 7D groups inner concentric coils 1D, 2D, 4D, 6D at steps along the grooves y _n = 6, 4, 2 each have (1-x) w _{to the} windings and the inner concentric coil groups 3G, 5G, 7G at steps by the groove y _'pi = 5,3 - by (1 + x) w with w _to coils _to coils of the remaining groups of concentric coils, said coils concentric neravnovitkovyh distribution coefficient neravnovitkovosti with x = 0.62 is repeated in each successive group of said concentric coils row, with c = 1, 2, 3 ....

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