RU2362254C1 - DOUBLE-WINDING STARTOR WITH m=3-PHASE 2p1=8·k- AND 2р2=10·k-POLE LAP WINDINGS IN z=120·k SLOTS - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and electrical machine building and can be used in three-phase double-speed cage asynchronous motors. Each of the 3-phase windings with 2p₁=8·k- and 2p₂=10·k-pole lap windings in z=120 K slots of the double-winding stator of the asynchronous motor is symmetrical with m'=6-zone from uniformly displaced windings, placed in slots in two layers. Of the K = z windings with numbers from 1K to (z)K, the 2p₁ - pole winding relates to K/2 windings with odd numbers 1K, 3K, …, (z-1)K, each containing w_k1 turns and connected, when q₁=5/2, in 6p₁ alternating three- and two sub-groups of windings, and the 2p₂-pole winding relates to K/2 windings with even numbers 2K, 4K, …, (z)K, each containing wk turns and connected in 6p₂ sub-groups of windings with q'₂=2 neighbouring windings in each. All windings have slot pitch y_k= 15, where k=1, 2 when q'₁ = z/12p₁ and q'₂ = z/12p₂.

EFFECT: easier manufacture and increased use of active materials while reducing amount of insulating materials used and differential scattering coefficients.

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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 multiples of m), the numbers of coils in the groups correspond to the grouping of the winding in the form of a numerical series determined by the fractional part c / d of the number 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 2: 3, 3: 4, 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 m = 3-phase 2p ₁ = 8 · k- and 2p ₂ = 10 · k-pole stator loop windings at z = 120 · k grooves.

The solution of this problem is achieved by the fact that for a stator with m = 3-phase 2p ₁ = 8 · k- and 2p ₂ = 10 · k-pole loop windings in z = 120 · k grooves, each of which is made symmetrical m '= 6 -zone of uniformly shifted 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, ... (z- 1) K, containing w _k1 turns and connected at q'1 = 5/2 in 6p ₁ alternating three- and two-coil semigroups, and 2/ _2- pole windings include K / 2 coils with even numbers 2K, 4K, ..., (z) K containing w _k2 turns and connected in 6p ₂ coil semigroups with q ' ₂ = 2 its adjacent coils in each, while all coils have a pitch in grooves _k = 15, where k = 1, 2 at q'1 = z / 12р 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 = 120 (k = 1), for _k = 15 for z / 2 = 60 grooves with groove numbers 1 ... 60 from the bottom, coils 1K, 2K, ... from above with phase zones AZBXCY layers for 2p ₁ = 8-pole winding at q'1 = 5/2 (odd coils), A'-Z'-B'-X'-C'-Y 'for 2p ₂ = 10-pole winding at q'2 = 2 (even coils) and the frontal parts of the coils 1K, 2K are shown from above; figure 2 and 3 on the alternation of the phase zones of figure 1, a triangular grid (with its side in two units of length) are constructed MDS polygons for 2p ₁ = 8 (figure 2) and 2p ₂ = 10 (figure 3) with numbering first q ₁ = z / 6p ₁ = 5 and q ₂ = z / 6p ₂ = 4 groove points with unit current vectors of zones AZBXCY in the center. At k = 2, the windings have 2p ₁ = 16 and 2p ₂ = 20 poles at z = 240 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 = 8-pole winding, figure 1, with q ₁ = z / 6p ₁ = 5, τ _p = z / 2p ₁ = 15 = y _to has the coefficients: shortening coils K _y = 1,0, distribution K _p = 0.5 / 5sin6 ° and winding K _rev = K _at K _p = 0.9567. According to the polygon MDS, figure 2, R ² _j = 8 ² +2 ² + 8 · 2 = 84 for j = 1, 4; R ² _j = 6 ² +4 ² + 6 · 4 = 76 for j = 2, 3; R ² _j = 10 ² = 100 for j = 5 and R ² _d = ΣR ² _j / 5 = 84, according to (1) R _o = 120 · 0.9567 / 4π and σ _d% = 0.645. For 2p ₂ when q = 10 ₂ = z / 6p ₂ = 4, q _'2 = 2, τ _n = 12 polygon IBC 3: K _y = sin (90 ° _{to the} y / τ _n) = sin112,5 °, K _p = 0.5 / 3sin10 °, K _rev = 0.8924, R ² _d = ΣR ² _j / 4 = 47, R _o = 120 · 0.8967 / 5π and σ _d% = 1.124, t. e. the proposed windings of a double-winding stator have high K _about at low differential scattering coefficients.

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)

Double winding stator with m = 3-phase 2p ₁ = 8 · k- and 2p ₂ = 10 · k-pole loop windings in z = 120 · 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, to the 2p _1- pole winding are K / 2 coils with odd numbers 1K, 3K, ..., (z-1) K, containing w _k1 windings and connected with q _'1 = 5/2 ₁ 6p alternating three- and two coil semigroup, and by winding 2p ₂ -polyusnoy include K / 2 coils with even numbers 2K, 4K, ..., ( z) K containing w _k2 turns and co united in 6p ₂ coil semigroups with q ′ ₂ = 2 its adjacent coils in each, while all coils have a pitch in the grooves at _k = 15, where k = 1, 2 for q ′ ₁ = z / 12p ₁ and q ′ ₂ = z / 12p ₂ .

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