RU2268538C1 - THREE-PHASED TWO-LAYERED ELECTRO-MECHANICAL WINDING WITH 2p=2c POLES WITHIN z=21c 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 loop-like winding with 2p=2c poles within z=21c grooves is made of 6p alternating four- and three-coiled groups with concentric coils with their average groove step value being equal to y_c=7 and value c=1,2,3,... . Odd four-coiled groups with groove steps values being equal to y_c=10-2(i-1) and even three-coiled ones with groove steps values being equal to y'_gi=9-2(i'-1) have coil numbers (1+x)w_c each for coils with i=1,2, i'=1, and (1-x)w_c coils for coils with i=3,4, i'=3. Coils with i'=2 have (1-x)w_c coils. Within each grove 2w_c coils are present, i=1...4 and i'=1...3 - numbers of coils in groups, starting from external one, while x = 0,57.

EFFECT: decreased differential dissipation of σ_d m'=6-zoned electro-mechanical split (q=3,5) loop-like winding.

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Description

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

Known two-layer loop symmetric m = 3-phase windings are known, which are performed by 2-pole in z grooves from m'p coil groups with equal-step or concentric coils with their average step in grooves at _k = 2q ... 3q 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≥2 (not a multiple of the number of phases m = 3) create harmonic MDSs in the series ν = m'k / d ± 1 [ibid, p. 450], including even and lower (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 '= 6-zone fractional symmetrical winding at 2p = 2 · with poles and z = 21 · with grooves (q = z / 6p = 7/2, N = 7, d = 2) s grouping coils in a row 4 3 4 3 ... [Livshits-Garik M. Windings of AC machines / Per. from English M.-L .: SEI, 1959, p.224], performed by concentric coils with their average pitch of the grooves have _a = 2q = 7.

The solution of this problem is achieved by the fact that for a three-phase 2-layer winding at 2p = 2 · s, z = 21 · s, made up of 6p alternating four- and three-coil groups with concentric coils with their average pitch in grooves at _k = 2q = 7 :

the odd four- _coil groups with y _pi = 10-2 (i-1) and the even three-coil groups with y ' _m = 9-2 (i'-1) have numbers of turns in (1 + x) w _k for coils with i = 1, 2, i '= 1 and along (1-x) w _to turns for coils with i = 3, 4, i' = 3 for w _to turns for coils with i '= 2 and 2w _to turns in each groove, where i = 1 ... 4 and i '= 1 ... 3 are the numbers of coils in groups, starting from the outer, and x = 0.57.

Figure 1 shows a scan of the groove layers of the proposed winding with c = 1, 2p = 2 poles, z = 21 grooves with numbers 1 ... 21 (bottom) and numbers of coil groups from 1G to 6G (top), alternating phase zones in A-ZBXCY sequences of the upper and lower layers; in Fig.2 are built on a triangular grid polygons of the MDS winding of Fig.1 with x = 0 (internal) and x = 0.5 (external). Such an m '= 6-zone winding according to Fig. 1 is connected in the usual way when turning on and off in phases of even groups of relatively odd ones (1G, 4G for the first phase, 3G, 6G for the second phase, 5G, 2G for the third phase) with their beginnings from the beginnings of groups 1G, 3G, 5G for phases I, II, III, and the phases can be conjugated by a star or a triangle. With c = 2, 3, ... the winding has 2p = 2s = 4, 6, ... poles with z = 21c = 42, 63, ... grooves and 6p = 12 (1G ... 12G), 18 (1G ... 18G), ... reel groups.

For the winding of Fig. 1, the winding coefficient K _ob is determined by the shortening coefficients K _yi = sin (90 ° y _pi / τ _p ) (with pole division τ _p = z / 2p = _21/2 = 10.5) of concentric coils taking into account Inequality x:

K _yi = (1 + x) 0.997204 (y _pi = 10, i = 1), (1 + x) 0.930874 (y _pi = 8, i = 2), (1-х) 0.781831 ( for _pi = 6, i = 3), (1-x) 0.563320 (for _pi = 4, i = 4), for i = 1 ... 4 groups of four-coil; (1 + x) 0.974928 (y ' _pi = 9, i' = 1), 0.866024 (y ' _pi = 7, i' = 2), (1-x) 0.680173 (y ' _pi = 5, i = 3), for i '= 1 ... 3 groups of three-coil, then

Of the polygons of the MDS of figure 2 (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 triangular grid and 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 = 0.57 is calculated, which corresponds to σ _{d% min} : for x _opt = 0.57 - K _rev = 0 , 89923, R ² _d = 254.9392 / 7, R _o = 21 · 0.89923 / π and σ _{d% min} = 0.80, and at x = 0 - σ _d% = 1.253, i.e. σ _d% at x _opt = 0.57 decreases by 1.253 / 0.80 = 1.57 times, which characterizes its effectiveness; taking into account the increase in K _{about, the} efficiency of the non-uniform winding is equal to K _eff = (0.89923 / 0.827765) (1.253 / 0.80) = 1.70, and its average _groove pitch in the grooves is equal to _y.s. = (Σу _pi ) / 7 = 7 + 12x / 7 = 7.98.

Thus, the proposed m '= 6-zone winding is characterized by an increased K _rev , a decreased σ _d% and more efficient K _eff = 1.70 times in comparison with an equal-turn winding. Its application allows to reduce additional losses in the rotor and magnetic noise in asynchronous squirrel-cage motors, to improve the shape of the voltage curve in synchronous generators.

Claims (1)

Three-phase two-layer electromachine winding at 2p = 2s poles in z = 21c grooves, made of 6p alternating alternately in-grooves in the grooves of odd four- and even three-coil groups with concentric coils with an average groove step of _k = 7, characterized in that the odd four-coil and even three-coil groups have groove pitch for _pi = 10-2 (i-1) and y ' _pi = 9-2 (i'-1), and concentric coils with i = 1,2 and i' = 1 have by (1 + x) w _to turns, with i = 3,4 and i '= 3 - by (1-x) w _to turns and from i' = 2-w _to turns at 2w _to turns in each groove, where i = 1, ... 4 and i ' = 1, ... 3 are the numbers of concentric coils of the indicated odd and even four- and three-coil groups, respectively, starting from the outside, with the coefficient of unequality of the concentric coils x = 0.57 and c = 1, 2, 3 ....

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