RU2268539C1 - THREE-PHASED ONE-LAYERED ELECTRO-MECHANICAL WINDING WITH 2p=2c POLES WITHIN z-36c GROOVES - Google Patents

Abstract

FIELD: electric engineering, can be used for technologies of electro-mechanical engineering, for engineering and construction of asynchronous and synchronous machines.

SUBSTANCE: three-phased one-layered loop-like winding with 2p=2c poles within z=36c grooves and with q=z/6p=6 is made chained with K=18 from evenly displaced coils with their groove step value being equal to y_c<3q and c=1,2,3,... . Each q/2=3 adjacent coils are connected serially and in matched manner as 6p coil semi-groups with opposite connection in each phase of even semi-groups relatively to odd ones, where groove step value is equal to y_c=2,5q=15.

EFFECT: decreased differential dissipation σ_d of m'=6-zoned one-layered electro-mechanical loop-like winding with q=6.

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Description

The invention relates to three-phase windings of electrical AC machines, can be used on a stator of three-phase asynchronous and synchronous machines, a phase rotor of asynchronous motors (HELL).

Loop single-layer symmetrical m = 3-phase, m '= 2m = 6-zone windings are known, which are 2-pole in z grooves with an integer number of grooves per pole and the phase q = z / 6p from 3p coil groups with q is equal to step or concentric coils at their average step along the grooves y _k = 3q [Voldek AI Electric cars. L .: Energy, 1978, p. 415-422].

Three-phase loop single-layer windings are also known, performed at even numbers q = z / 6p = 4 ... 8 when dividing each group into two halves with bending the frontal parts of their coils in different directions (windings "in a fork") with an average pitch of coils at _to <q and shorter frontal part, but the equivalent electromagnetic properties diametrical step in _to = 3q. All these windings are characterized by continuous phase zones and MDS polygons in the form of symmetrical hexagons. in contrast to shortened chain windings with discontinuous phase zones and an odd pitch y _to <3q coils [ibid., pp. 419-422], in which the harmonic composition of the MDS and the differential scattering σ _d can be improved.

The invention aims to reduce the differential scattering m '= 6-zone loop symmetrical single-layer winding at 2p = 2 · c poles and z = 36 · with grooves (q = z / 6p = 6), performed according to the circuit winding with a shortened odd step coils at _k = 3q.

The solution of this problem is achieved by the fact that for a three-phase single-layer winding at 2p = 2 · s, z = 36 · s and q = z / 6p = 6, performed by a chain of K = 18 · s uniformly displaced coils with their pitch in grooves y _to <3q: every q / 2 = 3 adjacent coils are connected in series according to 6p-semigroup reel counter at each phase is turned on in even-odd semigroup relatively where coils move along the grooves is equal _to y = 2,5q = 15.

Figure 1 shows a scan of the groove layer of the proposed winding with c = 1.2p = 2 poles, z = 36 grooves with numbers 1 ... 36 (bottom) and numbers of coil semigroups from 1P to 6P (top), alternating non-continuous phase zones in the sequence AZBXCY with step coils y _k = 15; figure 2 on a triangular grid (with its side in two units of length) built polygon MDS winding figure 1. Such an m '= 6-zone single-layer winding according to Fig. 1 is connected in the usual way when sequentially turned on in phases of even semigroups with respect to odd ones (1P, 4P for the first phase, 3P, 6P for the second phase, 5P and 2P for the third phase) s their beginnings from the beginnings of semigroups 1P, 3P, 5P for phases I, II, III, and the phases can be conjugated by a star or a triangle. At c = 2.3, ... the winding has 2p = 2c-4.6, ... poles at z = 36c = 72, 108, ... grooves, 6p = 12 (1P ... 12P), 18 (1P ... 18P), ... reel semigroups.

For winding 1 _of the winding ratio K = K _y K _p is determined by the coefficients of coils By shortening _y = sin (90 ° _{to the} y / τ _n) = sin (75 °) (with y _k = 15 and the pole pitch τ _p = z / 2p = 18), distributions K _p = [sin (3α _to / 2)] / 3sin (α _to / 2) (with an electric angle of shear shift α _to = 360 ° r / K = 20 °): To _about = 0.9271.

From the polygon MDS figure 2 (in the center shows the unit vectors of the currents of the phase zones A-Z-B-X-C-Y) is determined by a triangular grid and the relations

differential scattering coefficient σ _d characterizing the quality of the winding according to the harmonic composition of the MDS, where R ² _d is the square of the average radius j = 1 ... q of the groove points, R _o is the radius of the circle for the main harmonic [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) - (2) with K _about = 0.9271 are calculated: R _o = 36 · 0.9271 / π and σ _d% = 0.415.

For a single-layer “winding” winding, performed at 2p = 2, z = 36, y _k = 15, K _rev = 0.9561, which has continuous phase zones along the MDS polygon of FIG. 2, with a shift to the apex of the groove point 4 ' are determined by R ² _d = 724/6 and σ _d% = 0.525, i.e. σ _{d% of the} chain winding of FIG. 1 decreases by 0.525 / 0.415 = 1.27 times, which characterizes its effectiveness; taking into account the decrease in K _{about the} efficiency of the winding of Fig. 1 is equal to K _eff = (0.9271 / 0.9561) (0.525 / 0.415) = 1.23 with the same step of the coils at _k = 15 and the flow rate of the copper winding wires.

Thus, the proposed m '= 6-zone single-layer shortened chain winding is characterized by a reduced σ _d% and is more effective in K _eff = 1.23 times and compared with the “break-up” winding. Its application allows to reduce additional losses in the rotor and magnetic noise in asynchronous squirrel-cage motors, to improve the shape of the voltage curve in synchronous generators.

Claims (1)

The three-phase single-layer dynamoelectric winding at 2p = 2c poles at z = 36c grooves and q = z / 6p = 6 performed by a chain of K = 18c uniformly spaced coils with their pitch along the slots have _a <3q, characterized in that every q / 2 = 3 adjacent coils are connected sequentially in accordance with 6p coil semigroups when the opposite switching in each phase of even semigroups is relatively odd, where the pitch of the coils in the grooves is equal to _k = 2.5q = 15 and c = 1, 2, 3, ....

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