RU2355097C1 - DOUBLE-WINDING STATOR WITH m=3-PHASE 2p1=6·k- AND 2p2=8·k-POLE LAP WINDINGS IN z=144·k SLOTS - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: present invention pertains to electric machine engineering. The invention seeks to simplify manufacturing and increase use of active materials, while reducing input of insulating materials and coefficient of differential scattering σ_d% m=3-phase 2p₁=6·k- and 2p₂=8·k- pole lap windings of a stator in z=144·k slots. The essence of the invention lies in that, the double-winding stator of an asynchronous motor has m=3-phase 2p₁=6·k- and 2p₂=8·k-pole lap windings in z=144·k slots, each of which is made symmetrical from m=6-zone from equally spaced coils, put into the slots in two layers. According to this invention: from K=z coils with numbers from 1K to (z)K, the 2p₁ pole winding relates to K/2 coils with odd numbers 1K, 3K,…(z-1)K, containing w_K1 turns and connected into 6p₁ coil semi-groups with q'₁=4 neighbouring coils in each. The 2p₂ pole winding relates to K/2 coils with even numbers 2K, 4K,…,(z)K, containing w_k2 turns and connected into 6p₂ coil semi-groups with q'₂=3 neighbouring coils in each. All coils have uneven spacing in the slots, equal to y_k=19, or y_k=21, where k=1, 2 given q'₁=z/12p₁ and q'₂=z/12p₂.

EFFECT: easier manufacturing and increases use of active materials, while reducing input of insulating materials and coefficient of differential scattering.

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Description

The invention relates to three-phase stator windings of two-speed HELL (asynchronous motors) with a squirrel-cage rotor.

Known symmetric loop bilayer (unilamellar) m = 3-phase 2p-pole winding, performed in z grooves m'p of the coil groups (semigroup) of coils with a pitch of grooves in _a close to pole pitch τ _p = z / 2p, the number of grooves per pole and phase q = z / m'p and phase zones per pair of poles m '= 6 (zones A, Z, B, X, C, Y) [Voldek AI Electric cars. L .: Energy, 1978, p.393]. For integers q, each coil group contains q neighboring coils, and for fractional q = z / m'p = N / d = b + c / d (for numbers d not multiple of m), the numbers of coils in the groups correspond to the winding grouping in the form number series, determined by the fractional part of s / d of q [Livshits-Garik M. Windings of AC machines / Per. from English L .: SEI, 1959, p.224].

On the stator of two-speed blood pressure with a ratio of speeds of 3: 2, 4: 3, etc. usually two separate three-phase, three-phase windings are used, which are made in the form of ordinary double-layer loops that form four groove layers after laying, which increases the consumption of insulating materials and increases the groove scattering of the winding located in the lower groove layers. Both windings can also be carried out like single-layer chains with the location of their grooves and frontal parts in two layers [Sergeev P.S. et al. Design of electrical machines. M .: Energy, 1970, p. 450-453].

The invention aims to simplify the manufacture and increase the use of active materials while reducing the consumption of insulating materials, groove and differential σ _d% , scattering of m = 3-phase 2p ₁ = 6 · k- and 2p ₂ = 8 · k-pole stator windings at z = 144 · k grooves.

The solution of this problem is achieved by the fact that for a stator with m = 3-phase 2p ₁ = 6 · k- and 2p ₂ = 8 · k-pole loop windings in z = 144 · k grooves, each of which is made symmetrical m '= 6 -zone of uniformly displaced coils, laid in grooves in two layers: from K = z coils with numbers from 1K to (z) K to 2p ₁ -pole winding includes K / 2 coils with odd numbers 1K, 3K, ..., (zl ) K, containing w _k1 coils 6p and connected to _one coil semigroup with q ₁ '= 4 adjacent each of its coils, and a winding 2p ₂ -polyusnoy include K / 2 coils with even numbers of 2K, 4K, ..., (z ) K containing by w _k2 turns and connected in 6p ₂ coil semigroup from q ₂ '= 3 adjacent its coils each, wherein all coils have odd step of slots equal to y _k = 19 or y _k = 21 where k = l, 2 at q ₁ '= z / 12p ₁ and q ₂ ' = z / 12p ₂ .

Figure 1 shows a scan of the groove layers of the proposed windings of a double-winding stator at z = 144 (k = l), for _k = 19 for z / 2 = 72 grooves with groove numbers 1 ... 72 from the bottom, coils 1K, 2K, ... from above with phase zones AZBXCY layers for 2p ₁ = 6-pole winding with q ₁ = 8 (odd coils), A'-Z'-B'-X'-C'-Y 'for 2p ₁ = 8-pole winding with q ₂ = 6 (even coils) and the frontal parts of the coils 1K and 2K are shown above; in Fig. 2, according to the alternations of the phase zones of Fig. 1, a triangular grid (with its side two units of length), MDS polygons are constructed for 2p ₁ = 6 (external), 2p ₂ = 8 (internal) with the numbering of the first q ₁ = z / 6p ₁ = 8, q ₂ = z / 6p ₂ = 6 groove points with unit current vectors of zones AZBXCY in the center; in Fig. 3, like in Fig. 2, MDS polygons are constructed for the step of the coils U _k = 21. At k = 2, the winding has 2p ₁ = 12 and 2p ₂ = 16 poles at z = 288 grooves.

The windings of Fig. 1 are connected in the usual way for m '= 6-zone windings, i.e. the semigroups of zones X, Y, Z are switched on in phases opposite to the semigroups of zones A, B, C, and their phases should be conjugated by a star. The sides of the coils in FIG. 1 occupy half of each groove, but may have cross sections large for one and accordingly smaller for the other winding for different numbers of turns w _k and cross-sections of the conductors of their coils. Such windings, like single-layer chains, are obtained as if built-in one into the other with two layers for their groove and frontal parts, which reduces the consumption of insulating materials and reduces groove scattering. For large AMs, the connections of the coils of opposite-pole parts can be performed on opposite sides of the stator.

The differential scattering coefficient σ _d% is determined from the polygon of the MDS winding using a triangular grid [V. Popov Determination and optimization of the parameters of three-phase windings according to their polygons MDS // Electricity, 1997, No. 9, p.53-55] according to the ratios

where R ² _d is the square of the average radius for j = 1 ... N = q · d of the groove points of one repeating part of the polygon; R ² _{j are} determined by the cosine theorem.

2p ₁ = 6-pole winding of Fig. 1 for q ₁ = z / 6p ¹ = 8, τ _p = 24, for _k = 19 it has the coefficients: shortening coils K _y = sin (90 ° 19/24) = sin (71 , 25 °), the distribution of K _p = 0.5 / 4sin7.5 ° and the winding K _about = K _at K _p = 0.90684. According to the outer polygon MDS figure 2: R ² _j = 3 · 8 ² = 192 for j = 1; R ² _j = 10 ² +6 ² + 10 · 6 = 196 for j = 2.8; R ² _j = 12 ² +4 ² + 12 · 4 = 208 for j = 3.7; R ² _j = 12 ² +2 ² + 12 · 2 = 172 for j = 4.6; R ² _j = 14 ² = 196 for j = 5, R ² _d = ΣR ² _j / 8 = 192.5 according to (1), R _o = 144 · 0.90684 / 3π and σ _d% = 0.274. For 2p ₂ = 8 with q ₂ = z / 6p ₂ = 6, τ _n = 18 along the inner polygon of the MDS of Fig. 2: K _y = sin95 °, K _p = 0.5 / 3sin10 °, K _rev = 0.95614 and R ² _d = ΣR ² _j / 3 = 724/6, R _o = 144 · 0.95614 / 4π and σ _d% = 0.517. Similarly, for y _k = 21 along the MDS polygons of FIG. 3: for 2p ₁ -K _ob = 0.93926, R _d ² = 206.5 and σ _d% = 0.269; for

2p ₂ -K _about = 0.9271, R ² _d = 680/6 and σ _d% = 0.415, i.e. the choice of step y _k = 19 or y _k = 21 is determined by the design conditions and the powers of the two-speed blood pressure.

The application of the proposed windings on the stator of two-speed squirrel-cage motor with a short-circuited rotor allows simplifying the manufacture, reducing the consumption of insulating materials, improving the electromagnetic parameters of the windings due to the reduction of their groove and differential scattering in comparison with conventional separate single-pole and double-layer windings.

Claims (1)

A double winding stator with m = 3-phase 2p ₁ = 6 · k- and 2p ₂ = 8 · k-pole loop windings in z = 144 · k grooves, each of which is made symmetrical m '= 6-zone of uniformly displaced coils, laid in grooves in two layers, characterized in that from K = z coils with numbers from 1K to (z) K, 2/ _1- pole windings include K / 2 coils with odd numbers 1K, 3K, ..., (z-1) K containing w _k1 turns and connected in 6p ₁ coil semigroups with q ' ₁ = 4 adjacent coils in each, and K / 2 coils with even numbers 2K, 4K, ..., (z) belong to the 2p _2- pole winding K, containing coils and w _k2 cos inyaemyh in 6p ₂ coil semigroup with q _'2 = 3 adjacent its coils each, wherein all coils have odd step of slots equal to y _k = 19 or y _k = 21 where k = 1, 2, with q' ₁ = z / 12p ₁ and q ' ₂ = z / 12p ₂ .

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