RU2270514C2 - ELECTRICAL-MACHINE THREE-PHASE DOUBLE-LAYER WINDING WITH 2p=10, z=96 (q=16/5) - 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 poles in z= 96 slots and coils grouped in row 4 3 3 3 3 repeated six times is made of 6p = 30 coil groups numbered 1G through 30G at mean slot pitch y_s = 8. Novelty is that in order to reduce differential dissipation σ_d of electrical-machine m' = six-band fractional-pitch (q = 16/5) lap winding, coil group 1G out of first-grouping coil groups 1G through 5G has turn numbers (1 - x)w_c in first and fourth coils and coil groups 3G, 4G have turn numbers (1 + x)w_c in intermediate coil at w_c turns in remaining coil groups and at turn number 2w_c in each slot. Mentioned distribution of coils with unequal turn number is repeated in each next grouping at index of inequality of phase groups x = 0.24.

EFFECT: reduced differential dissipation in electrical-machine 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 y _to ≈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 at 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 for its direct (+) or counter (-) rotation.

The invention aims to reduce the differential scattering m '= 6-zone symmetrical fractional winding at 2p = 10 poles, z = 96 grooves (q = z / 6p = 16/5, d = 5) with a group of coils in a series of 4 3 3 3 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 two-layer winding at 2p = 10, z = 96 with a grouping of 4 3 3 3 3, repeated 6 times, performed from 6p = 30 coil groups with numbers 1 G ... 30 G with an average step of coils in the grooves y _k = 8:

for groups 1G ... 5G of the first group, group 1G has the number of turns in (1-x) w _{to the} coils of the first and fourth, and groups 3G and 4G - in (1 + x) w _{to the} turns in the middle coil with w _to 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 = 0.24.

Figure 1 shows a scan of the groove layers of the proposed winding at 2p = 10, z = 96 with numbers 1 ... 96 (for z '= z / 2 = 48 grooves) and numbers of coil groups from 1G to 30G (the 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 1G for the pole p = 5 main ν = 1 (outer) and p _ν = νp = 1 lower ν = 1/5 (central) harmonic: figure 3 polygons of the MDS winding of Fig. 1 are constructed on a triangular grid 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.

1 for winding the winding coils ravnovitkovyh coefficient (x = 0) by shortening K coefficients _y = sin (90 ° _{to the} y / τ _n) (y _k = 8, τ _p = z / 2p = 48/5) and distribution K _p = 0.5 / Nsin (30 ° / N) is equal to K _vol . _O = K _y K _p = 0.922556. For unequal coils, a value is added to K _vol.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 _n = 360 ° / z = 3.75 °: -2x0.965926 (cos7.5α _n ) = -x1.703741 for 1G and 2x0.965926 cos (0.5α _p ) = + x1.930817 for 13G + 19G at K _y = sin (90 ° y _p / τ _p ) = 0.965926 (y _p = 8 ), ∑х / 16 = + х0.01419 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. Definition and optimization of the parameters of three-phase windings along 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 = 0.24 is calculated, corresponding to σ _{d% min} : for x _opt = 0.24-K _rev = 0 , 92596, R ² _d = 517.6528 / 16, R ₀ = 96 · 0.92596 / 5π and σ _{d% min} = 1.03, and at x = 0σ _d% = 1.64, i.e. σ _d% for x = 0.24 is reduced _wholesale 1.64 / 1.03 = 1.59 times that characterize the high efficiency of the proposed winding.

-2x0,25882cos1,5α_п=-x0,5152 для 1Г, -2x0,25882cos(0,5α_Г-γ)=-x0,4208 для 13Г+19Г при α_Г=360°/p=72° и ∑х/16=-х0,05849, тогдаThis reduction in the differential scattering due to the elimination of IBC 1 winding lower harmonic ν = 1/5, the pole p _ν = νp = 1, for which, at the central diagram of Figure 2 when K _yν = sin (ν90 ° _to y / τ _n) = 0.25882, angle γ = α _n / 2d = 0.375 °: K _pν = ∑E _ν / 16 = 0.055365 and

-2x0.25882cos1.5α _n = -x0.5152 for 1Г, -2x0.25882cos (0.5α _Г -γ) = - x0.4208 for 13Г + 19Г with α _Г = 360 ° / p = 72 ° and ∑х / 16 = -x0.05849, then

определяется значение х'=0,24, при котором из МДС обмотки фиг.1 полностью устраняется низшая гармоническая ν=1/5.where by condition

the value x '= 0.24 is determined, in which the lowest harmonic ν = 1/5 is completely eliminated from the winding of the 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 = 0.24 in K _eff = 1.60 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 fields, improve vibroacoustic characteristics, increase efficiency and cosφ ₁ , overload capacity of the machine.

Claims (1)

A three-phase two-layer electromachine winding with the number of poles 2p = 10, the number of grooves z = 96, q = 16/5 with the grouping of coils in a row 4 3 3 3 3, repeated 6 times, made of 6p = 30 coil groups with numbers 1Г ... 30G with an average pitch of the coils in the grooves y _k = 8, characterized in that in the coil groups 1G ... 5G of the first group, the coil group 1G has the number of turns (1-x) w _k in the first and fourth, and the coil groups 3G and 4G have (1 + x) w _k turns in the middle coil with the number of turns w _k in the remaining coils of the coil groups and with the number of turns 2w _to each groove, The distribution of unequal coils is repeated in each subsequent grouping, where x = 0.24 is an indicator of the unevenness of the phase groups.

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