RU2270505C2 - ELECTRICAL-MACHINE THREE-PHASE DOUBLE-LAYER WINDING WITH 2p=10, z=84 (q=14.5) - 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= 84 slots and coils grouped in row 3 3 3 3 2 repeated six times is made of 6p = 30 coil groups numbered 1G through 30G at mean slot pitch y_s = 7. Novelty is that in order to reduce differential dissipation σ_d of electrical-machine m' = six-band fractional-pitch (q = 14/5) lap winding, coil groups 2G, 3G in first-grouping coil groups 1G through 5G have turn numbers (1 - x)w_c for third coil of coil group 2G and first coil for coil group 3G; coils of coil group 5G have turn numbers (1 + x)w_c at w_c turns in remaining coils of 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, where x = 0.23.

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 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 for its direct (+) or counter (-) rotation.

The invention aims to reduce the differential scattering m '= 6-zone fractional symmetrical winding at 2p = 10 poles, z = 84 grooves (q = z / 6p = 14/5, d = 5) with a group of coils in a series of 3 3 3 3 2 [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 = 84 with a grouping of 3 3 3 3 2, repeated 6 times, performed from 6p = 30 coil groups with numbers 1G ... 30G with an average step the coils in the grooves at _k = 7:

for groups 1G ... 5G of the first grouping, groups 2G and 3G have the number of turns in (1-x) w _{to the} coils of the third for 2G and the first for 3G, and the coils of 5G in (1-x) w _to turns for w _to turns in the remaining coils of the groups and 2w _{to the} turns of each groove, the indicated distribution of unequal coils being repeated in each subsequent grouping, where x = 0.23.

Figure 1 shows a scan of the groove layers of the proposed winding at 2p = 10, z = 84 with numbers 1 ... 84 and the numbers of coil groups from 1G to 30G (marked groups of the first phase 1G + 3 (s) G = 1G, 4G, 7G, ...), by alternating phase zones in the sequence of AZBXCY; figure 2 shows the diagram of the shift of the axes of the odd groups of the first phase relative to the axis of symmetry 25G for the pole p = 5 of the main harmonic ν = 1 (outer) and the pole of p _ν = νp = 1 lower harmonic ν = 1/5 (central); 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.

1 for winding the winding coils ravnovitkovyh coefficient (x = 0) by shortening K coefficients _y = sin (90 ° _{to the} y / τ _n) (y _k = 7, τ _p = z / 2p = 42/5) and distribution K _p = 0.5 / Nsin (30 ° / N) is equal to K _vol.o = K _y K _p = 0.922606. For unequal coils, a value is added to K _vol.o. , depending on the non- _uniformity index x of the phase groups in Fig. 2 for the angle of the shift of the grooves α _p = 360 ° / z = 30 ° / 7: 2x0,965926 (сs2,5α _p ) = + x1.898173 for 25G, -2x0.965926 cos (0.5-5) α _p = -x1.823443 for 7G + 13G at K _y = sin (90 ° y _p / τ _p ) = 0.965926 (y _p = 7), Σх / 14 = + х0.00534 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 = 0.51 is calculated, which corresponds to σ _{d% min} : for x _opt = 0.23-K _rev = 0.923834, R ² _d = 346.3992 / 14, R _o = 84 · 0.923834 / 5π and σ _{d% min} = 1.38, and at x = 0-σ _d% = 2.12, i.e. σ _d% at X _opt = 0.23 decreases by 2.12 / 1.38 = 1.54 times, which characterizes the effectiveness of the proposed winding.

This reduction in the differential scattering beacause 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 = 3 ° / 7: K _pν = ΣE _ν / 14 = -0.06014 and K _obνo = K _уν K _pν = -0.01557; 2x0.25882 (cos0.5α _p ) = + x0.5173 for 25G, 2x0.25882cos (0.5α _p -α _p + γ) = + x0.4383 for 7G + 13G at α _p = 360 ° / p = 72 ° and Σx / 14 = + x0.0683, then

whence, according to the condition K _obν = 0, the value x '= 0.23 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 = 0.23 in K _eff = 1.54 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 turns in z = 84 and q = 14/5 with a grouping of coils in a row 33332, repeated 6 times, is made of 6p = 30 coil groups with numbers 1G ... 30G with an average step coils of slots at _k = 7, characterized in that the coil groups 1G ... 5G first grouping coil group 2G and 3G have the number of turns (1-x) w _to the third coil to coil 2r group and the first coil to 3G coil group, and coils of the coil groups 5G have the number of turns (1 + x) w _to w if the number of turns _to the remaining coils katu echnyh groups and the number of turns _in each slot 2w, said distribution neravnovitkovyh coils is repeated in each successive grouping, where x = 0.23.

Images