RU2324273C2 - THREE-PHASE DOUBLE-LAYERED ELECTRIC MACHINE WINDING IN z=102·c SLOTS WITH 2p=26·c POLES (q=34/13) - Google Patents

Abstract

FIELD: electric machinery industry.

SUBSTANCE: three-phase double-layered electric machine winding in z=102·c slots with 2р=26·C poles with number of slots per pole and phase q=z/3p=34/13 is composed of 3р·c coil groups with numbers from 1G to 39G·c and coil grouping as 3323323233232 sequence repeated 3·c times: In 1G...13G groups of the first grouping concentric coils have slot pitches of У_si=6, 4, 2 with (l-x)w_K, (l+x) w_K, (l-x)w_K turns for three-coil groups and y'_si=5, 3 with w_K, (l+x)w_K turns for two-coil groups at х=0.56, where c=1, 2, 3, ...; 2w_K is the number of turns in those slots that are completely filled with winding. This distribution of coils with different number of turns is repeated in every next grouping.

EFFECT: lowering of differential scattering factor σ_d of asymmetric t'=3-zone fractional-slot (q=34/13) lap winding of electric machinery.

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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 _to ≈τ _p = z / 2p, the number of grooves per pole and phase q = z / m'p whole or fractional, where m '= 2m = 6 or m' = m = 3 is the number of phase zones per pair of poles [A. Voldek 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, with a symmetric sinusoidal current, harmonic MDSs 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 the harmonic ν> 0 with its direct (+) or counter (-) rotation.

The invention aims to reduce the differential scattering m '= 3-zone two-layer winding in z = 102c grooves at 2p = 26 · with poles performed with q = z / 3p = 34/13 (N = 34, d = 13) of 3p · From coil groups with a grouping in the series 3323323233232, repeated 3 · s times [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 = 102 · c grooves at 2р = 26 · with poles with the number of grooves per pole and phase q = 34/13, made of 3Р · с coil groups with numbers 1G ... 39G · s and a grouping of coils in a series of 3323323233232, repeated 3 · s times:

in groups 1G ... 13G of the first grouping, concentric coils have _groove steps for _Pi = 6, 4, 2 s (1-x) w _k , (1 + x) w _k , (1-x) w _k turns for groups three-coil and y ' _Pi = 5, 3 with w _k , (1 + x) w _k turns for two-coil, and this distribution of unequal coils is repeated in each subsequent grouping, where c = 1, 2, 3, ...; 2w _to - the number of turns of the grooves, completely filled with a winding, and the value of x = 0.56.

Figure 1 shows a scan of the groove layers of the proposed winding at c = 1 and z = 102 with groups 1G ... 39G (numbered above) for z '= z / 3 = 34 grooves with numbers 1 ... 34 (bottom) and alternating phase zones in the sequence ABC and XYZ in the upper and lower layer, where the blackened grooves are incomplete when equivalent z _e = 3 (N-3x) grooves are completely filled with a winding; figure 2 shows a diagram of the shifts of the axes of the groups of zones A relative to the axis of symmetry 16G; figure 3, 4 on a triangular grid with its side per unit length constructed polygons MDS winding figure 1 at x = 0 (figure 3), x = 0.5 (figure 4). Such an m '= 3-zone winding is connected in the usual way with sequentially-consistent inclusion in the phases of the groups 1Г + (3к) Г = 1Г, 4Г, 7Г, ..., 14Г + (3к) Г = 14Г, 17Г, 20Г,. .., 27Г + (3к) Г = 27Г, 30Г, 33Г, ... in phases I, II, III, and the phases can mate in a star or a triangle. With, for example, c = 2, the winding is performed in z = 204 grooves and 2p = 52 poles out of 78 coil groups 1G ... 78G.

For winding 1 ravnovitkovoy (x = 0), the winding factor K _{is about} by shortening K coefficients _y = sin (90 ° _{to the} y / τ _n) as y _k = 4, τ _n = 2p = 51/13, the distribution of K _p = sin (60 °) / Nsin (60 ° / N) is equal to K _ob = K _for K _p = 0.82673, and when x ≠ 0, the value of the non-uniformity of the coils of the groups, determined by figure 2 with α _p = 360, is added to K _ob ° / z = 60 ° / 17: -2x (0.673696-0.999526 + 0.717912) (cos0.5α _n + cos1.5α _n + cos2.5α _n + cos3.5α _n ) = - x3.105503 for (1G + 31G) + (4G + 28G) + (7G + 25G) + (10G + 22G), x0.93247 (1 + 2cosα _n + 2cos2α _n ) = x4.64469 for 16G + (13G + 19G) + (34g + 37g) with _yi = 0.673696 K (y _pi = 6) 0.999526 (y _pi = 4) 0.717912 (y _pi = 2) 0.93247 (y _'pi = 3) K _about N = 28.10888, ∑x = + 1.53919 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 = 34 groove points, R _o and K _rev are for harmonic ν = 1:

According to (1) - (3) from the condition d (σ _d ) / d (x) = 0, the optimal x _opt = 0.56 is calculated, corresponding to σ _{d% min} : K _rev = 0.89638, R ² _d = 164, 3856/34, R _o = 96.96 · 0.89638 / 13π and σ _d% = 6.76 (for equivalent grooves z _e = 3 (N-3x) = 3-32.32 = 96.96, completely filled winding), and at x = 0-σ _d% = 16.60, i.e. the value of σ _d% at x _opt = 0.56 decreases by 16.60 / 6.76 = 2.45 times due to the elimination of harmonic MDS ν = 1/13; taking into account the increase in K _about its efficiency is equal to K _eff = (0.89638 / 0.82673) (16.60 / 6.76) z _e / z = 2.62 in comparison with the equal-coil (x = 0) winding; compared with m '= 6-zone winding at 2p = 26, z = 102, q = z / 6p = 17/13, Y _k = 3, K _rev = 0.8906, σ _d% = 9.39 and grouped 2112112112111, the proposed m '= 3-zone winding is characterized by a reduced σ _d% of 9.39 / 6.76 = 1.39 times and is much easier to manufacture due to half the number (3p) of coil groups.

The application of the proposed winding on the stator HELL allows you to reduce additional losses in steel and asynchronous moments from harmonic fields, improve vibroacoustic characteristics, increase efficiency and cosφ ₁ , the overload capacity of the machine, and in synchronous generators improves the shape of the output voltage curve.

Claims (1)

Three-phase two-layer electromachine winding in z = 102 · c grooves at 2p = 26 · s poles with the number of grooves per pole and phase q = z / 3p = 34/13, made of 3p · s coil groups with numbers from 1G to 39G · s and grouping coils in a series of 3323323233232, repeated 3 · s times, characterized in that in groups 1G ... 13G of the first grouping, concentric coils have _groove steps at _pi = 6, 4, 2 s (1-x) w _k , ( 1 + x) w _to , (1-x) w _to turns for groups of three-coil and y ' _pi = 5, 3 with w _to , (1 + x) w _to turns for two-coil, and this distribution of unequal coils is repeated in each subsequent grouper ovke, where c = 1, 2, 3, ...; 2w _to - the number of turns of the grooves, completely filled with a winding, and the value of x = 0.56.

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