RU2270507C2 - ELECTRICAL-MACHINE THREE-PHASE DOUBLE-LAYER WINDING WITH 2p=10, z=108 (q=18/5) - Google Patents

Abstract

FIELD: electrical and electromechanical engineering; three-phase induction and synchronous machines.

SUBSTANCE: proposed three-phase double-layer lap winding with 2p = 10 in z = 108 slots and coils grouped in row 4 4 3 4 3 repeated 6 times is made of 6p = 30 coil groups numbered 1G through 30G at mean slot pitch of coils y_c = 9. Novelty is that in order to reduce differential dissipation σ_d in m' = six-band fractional-pitch (q = 18/5) lap winding, coil groups 1G and 2G in first-grouping coil groups 1G through 5G have turn numbers (1 - x)w_c in first coil of coil group 1G and in fourth coil of coil group 2G, and coil groups 3G and 5G have turn numbers (1 + x)w_c in intermediate coil at turn number w_c in remaining coil groups with 2w_c turns in each slot. Mentioned distribution of coils with unequal turn number is repeated in each next grouping at x = 0.28.

EFFECT: reduced differential dissipation in fractional-pitch lap winding.

1 cl, 3 dwg

Description

The invention relates to the windings of electrical 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, m '= 2m = 6-zone windings, performed by 2-pole in z grooves from 6p coil groups with equal-step or concentric coils with their average step in grooves at _k ≈z / 2p, number grooves per pole and phase q = z / 6p whole or fractional [Voldek AI Electric cars. L .: Energy, 1978, S. 392-393]. Fractional windings with q = z / 6p = N / d and d> 4 create harmonic MDSs in the series ν = 6k / d ± 1 [ibid, p. 450], including lower ones (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 '= 6-zone symmetrical fractional winding at 2p = 10 poles and z = 108 grooves (q = z / 6p = 18/5, d = 5) with a group of coils in a series of 4 4 3 4 3 [Livshits-Garik M. Windings of AC machines. M. - L .: SEI. 1959, p. 224].

The solution of this problem is achieved by the fact that for a three-phase 2-layer winding at 2p = 10, z = 108 with a grouping of 4 4 3 4 3, repeated 6 times, performed from 6p = 30 coil groups with numbers 1G ... 30G with an average step coils in the grooves of _k = 9:

for groups 1G ... 5G of the first group, groups 1G and 2G have the number of turns in (1-x) w _{to the} coils of the first for 1G and fourth for 2G, and the groups of 3G and 5G have (1 + x) w _to turns in the middle the coil at w _{to the} turns in the remaining coils of the groups and 2w _{to the} turns of each groove, and the indicated distribution of unequal coils is repeated in each subsequent grouping, where x = 0.28.

Figure 1 shows a scan of the groove layers of the proposed winding at 2p = 10, z = 108 with numbers 1 ... 108 (for z '= z / 2 = 54 grooves) and numbers of coil groups from 1G to 30G (groups of the first phase are marked 1G + 3 (s) G = 1G, 4G, 7G, ...), by alternating phase zones in the sequence AZBXCY; figure 2 shows a diagram of the shift of the axes of the odd groups of the first phase relative to the axis of symmetry 19G for the pole p = 5 main ν = 1 (external) and p _ν = νр = 1 lower ν = 1/5 (central) harmonic; figure 3 are built on a triangular grid polygons of the MDS winding of figure 1 with x = 0 (internal), x = 0.25 (external). Such an m '= 6-zone winding according to Fig. 1 is connected in the usual way when they are turned on in phases of even groups with respect to odd ones with their beginnings from the beginning of groups 1G, 11G, 21G for phases I, II, III, and the phases can be conjugated by a star or a triangle.

For the winding of Fig. 1, the winding coefficient with equal-coil coils (x = 0) by the shortening coefficients K _y = sin (90 ° y _k / τ _p ) (y _k = 9, τ _p = z / 2p = 54/5) and the distribution K _p = 0.5 / Nsin (30 ° / N) is equal to K _vol . _O = K _y K _p = 0.92252. For unequal coils, a value is added to K _r.o. , depending on the non- _uniformity index x of the phase groups of FIG. 2 for the angle of the shift of the grooves α _p = 360 ° / z = 10 ° / 3: 2x0.965926 [-cos (1 + 7 5) α _p + cos (0.5α _p )] = + x0.230616 at К _у = sin (90 ° y _к / τ _п ) = 0.965926 (y _п = 9), Σx / 18 = + x0, 01281 and then

From the MDS polygons of Fig. 3 (in the center, the unit current vectors of 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 = 0.28 is calculated, which corresponds to σ _{d% min} : for x _opt = 0.28-K _rev = 0 , 92611, R ² _Д = 735.9648 / 18, R _о = 108 · 0.92611 / 5π and σ _{d% min} = 0.84, and at x = 0-σ _d% = 1.09, i.e. . σ _d% at x _opt = 0.28 decreases by 1.09 / 0.84 = 1.30 times, which characterizes the high efficiency of the proposed winding.

This decrease in differential scattering is due to the limitation in the MDC of the winding of Fig. 1 of the lower harmonic ν = 1/5 with a pole of p _ν = νp = 1, for which, according to the central diagram of Fig. 2, when K _yν = sin (ν90 ° y _k / τ _p ) = 0.25882, angle γ = α _n / 2d = 1 ° / 3: K _yν = ΣE _ν / 18 = -0.02926 and K _obνo = K _уν K _pν = -0.00757; 2x0,25882 [cos (α _n -γ) + cos (0,5α _n + 1,5α _n + 2γ)] = + h0,5495 at α _p = 360 ° / p = 72 ° and Σx / 18 = + x0 , 0305 then

whence, by condition K _obν , the value x '= 0.25 is determined, at which the lowest harmonic ν = _1/5 is completely eliminated from the MDS winding of Fig. 1.

Thus, the proposed winding is characterized by a reduced coefficient of differential scattering σ _d% , increased K _about and more efficient at x _opt = 0.28 in K _eff = 1.30 times in comparison with an equal-turn winding; its application, for example, on the HELL stator, allows to reduce additional losses in steel and asynchronous moments from harmonic components of the field, to improve vibroacoustic characteristics, to increase efficiency and cosφ ₁ , overload capacity of the machine.

Claims (1)

A three-phase two-layer electric machine winding with the number of poles 2p = 10, the number of grooves z = 108, q = 18/5 with a grouping of coils in a row 4 4 3 4 3, repeated 6 times, made of 6p = 30 coil groups with numbers 1Г ... 30G with an average pitch of the coils in grooves, y _k = 9, characterized in that in the coil groups 1G ... 5G of the first group, the coil groups 1G and 2G have the number of turns (1-x) w _k for the first coil for the coil group 1G and the fourth coil for the 2G coil group, and the 3G and 5G coil groups have in number (1 + x) w _k turns in the middle coil with the number of turns w _k in the rest 's coils and coil groups including 2w _{to the} coils of each slot, said distribution neravnovitkovyh coils is repeated in each successive grouping, where x = 0.28.

Images