SU1128335A1 - Three-phase combined stator winding for a.c.electric machines - Google Patents

Abstract

THREE-PHASE COMBINATED STATOR FOR ELECTRIC AC MACHINES, for example, synchronous with the excitation of the third. harmonics of a magnetic field, bilayer, containing evenly distributed coil groups and connected into a star with two parallel branches and zero results, which are clamps for polarity, whose branches are made with different steps and numbers of turns so that their winding coefficients are equal to jia turns for polarity, p are equal, characterized in that, in order to simplify the design and manufacturing technology, increase the use of copper and improve the parameters, the winding contains 6p coil groups with k 3} with concentric coils in each of the bars U and Uz - 2 (i-1), connected in series into three subgroups, the first of which contains from adjacent coils, starting with the outer one. - from the coils starting with the number of the second c + 1, a third - the remaining coils of the group, subgroups of the same name are connected in chains and in the Calda phase are connected in series the chains of the second and first subgroups for one branch, the second and third for another branch, the beginnings of branches. the terminals of the phases, and the ends are connected to the indicated numerical leads, and in each phase the points of connection of the second subgroups with (N the first and the third are interconnected for the coils of the second subgroups, C as well as coils with the same numbers, the sides of which are located in common grooves The numbers of turns are equal to LM “, and for the first coils, subgroups Y. X of the third X, where Yc 3k is the pitch of the outer cartridges 1 1,2, .., k is the coil number in 00 00 00 SP group, k / 3 at 1 { a multiple of k + 1 2c with three, с -I- and other values of k, X is determined from the condition of equality of the products of the numbers of turns of the branches and their winding coefficients for polarity p.

Description

1 The invention relates to the core windings of alternating current machines and can be applied, for example, in synchronous machines with third-harmonic excitation of the magnetic field of single-machine frequency and number of phase converters. Combined windings of alternating current machines are known, made in the form of parapelle branches of polarity p, each of which consists of spatially shifted coils and has arcs of middle points appearing with the beginnings of polarity phases p. The angle between the axes of the coils of the branch is equal to rad, and the number of turns of the coils Р «+ Pg are proportional to the angle of shift of them relative to the axis of the branch lj. The disadvantages of these windings are the complexity of the design and manufacturing technology, the large losses from the balancing currents in the branches, and the limited scope of application. Combined windings with the Po / Pi 6 ratio are known. They are made of 12 evenly distributed Katushek groups connected in two parallel branches with zero points, which are clamps for polarity Prt and. A disadvantage of the windings is the limited field of application. Closest to the proposed technical entity is a synchronous machine with excitation from the third harmonic of a magnetic field on the stator of which a three-phase combined winding is laid, performing the functions of the main and additional windings with polarity p and Zp and containing evenly distributed coils connected in a star with two parallel branches and zero leads connected via a rectifier to the excitation winding of the rotor. The parallel branches are made with different steps and numbers of turns so that and their winding coefficients on the number of turns for a polarity p are equal, and for Zr there are different values of a. The disadvantages of the known machine are the complexity of the design and manufacturing technology due to the uneven distribution of raznougovykh katu necks, incomplete and uneven filling of the grooved layer, low winding coefficient and poor HC shape for polarity Sp. The purpose of the invention is to simplify the design and manufacturing technology by completely and uniformly filling the slot layer, increasing the winding coefficient and improving the shape of the HC curve for polarity Sp. This goal is achieved by the fact that the winding contains 6p coil groups with k 3 concentric coils each with steps jij 9 "(i-1) connected in series into three subgroups, the first of which contains adjacent coils starting from the outer, second from coils starting from numbers i Е + 1, third third coils of the group, subgroups of the same name are connected in a chain and in each phase there are connected in series the chains of the second and first subgroups for one branch, the second and third for the other branch, the beginning of the branches form phase clamps, and the ends are connected to the specified zero pins, in each phase the points of connection of the subgroups of the second with the first and the third are interconnected and for the coils of the second subgroups, as well as coils with the same numbers i, the sides of which are located in common grooves, the number of turns is W, and for the other coils of the first subgroups -W |; tx and third - W (jt X, where 3 k is 1 4 and 6 3k is the pitch of the outer coils, i 1,2, .. ,, k is the coil number in the group .-. When k is a multiple of three, 1II Lp C And C k - 2c for other values of k, X - is determined from the condition of equality of the products of the number of turns of the branches by their winding coefficients for yusnosti p. FIG. 1 is a diagram of the winding being presented with p 1 and k 3; FIG. 2 and 3 are diagrams of the emf of its phase for the polarity of p and 3p in FIG. 4 is a diagram of the proposed winding of FIG. 5 is a diagram of the emf of its phase for polarity p, in FIG. 6 is a diagram of the proposed winding 2p 3. The winding (figure 1) has p 1 ,, is three-phase, two-layer and contains 6p 6 coil groups with numbers from 1 to 6 and its coils are made with steps and 3k - 1 - 2 (; -1) 8, 6, 4, where 1, 2, 3 coil number in the group. In one of them, the middle and outer coils are included sequentially, and the middle and inner ones in the other. The beginning of the branches form the terminals of the phases, and the ends are connected to the two zero terminals O and O. In each phase, the points of connection of the middle coils with the outer and inner coils are interconnected. The upper row of arrows (Fig. 1,4,6) shows the direction of the currents when powering the winding through the C1, C2 SZ terminals with three-phase current (for the time when the current in the C1 phase has the maximum value), and the lower direction of the currents when the winding is supplied through the terminals O and O single-phase current. On the diagrams (FIGS. 2, 3, 5) the numbers of groups are assigned to the EMF vectors of the first subgroups, the same subgroups of the second subgroups, the same two-stroke numbers of the third subgroups. In the EMF diagram (Fig. 2), for polarity p, the magnitudes of the EMF vectors are proportional to the shortening coefficients of the coils K ,, p 0.985, 6.866, 0.643. The numbers of turns of the second subgroups of middle coils are equal to N У; , the first outer and the third inner x, where X is determined from the equality (W) ix) Kiip si K -xHyp, X 0.21L (,. Consequently, all the grooves and arcs have the same number of turns, the number of turns of the outer middle and inner coils ts in the ratio of 0.79: 1.0: 1.21, the winding coefficient for the polarity of p is equal to К „5„. 0.807. Oer In the diagram of FIG. 3 for polarity, Er the magnitudes of the vectors are proportional to the shortening coefficients 0.866, O, KJ, p 0.866.The second subgroups with K, j, j, O are taken out of the circuit between the terminals O and O, as a result of which the winding coefficient for polarity Zr 0.866 increases. product

ABOUT

-1 h

about

FIG. 0,807 0,866 0,7, characterizes the degree of use of copper winding (Fig. 1). Figure 4 shows an example of the implementation of the proposed winding with p 1 and k 6. Here, the coils are made with steps ij; 31 - 1 - 2 (a-1) 17, 15, 13, 11, 9, 7, where the number of the coil in the group. The first, second and third subgroups contain by. k / 3 2 coils and their shortening coefficients are equal; for poles of 0.996 + 0.966. 1.962, 0.906 -I- 0.819 1 ,, K ,, p K 0.707 + 0.574 1.281 (FIG. 5), for the polarity Cp - 0.966 - 0.707 1.673, K, p 0.259 + + 0.259 O, 0.707 + 0.966 1.673. The numbers of turns of the coils of the second subgroups are equal to W | j of the first subgroups and the third -Wj. + X, where V 0.21 W |. , as well as for the winding in FIG. Thus, the numbers of turns of the coils of the winding group (Fig. A) are in the ratio of 0.79: 0.79: 1.0: 1.0:: 1.21: 1.21 and all the slots have the same number of turns: 0.804 . 0.837 0.673. The winding (FIG. 6) is made with p 2 k 3 and has winding parameters phi d.1. Compared with the known winding having a p 2, the number of slots 36, the steps of coils 8 and 6, Kgg, p 0.881 0.244 0.215, in the proposed (FIG. 6) use of copper is 0.7: 0.215 3.26 times higher. In addition, the winding has a uniform and complete filling of the slot layer, the best forms of the NA curves, more technological in manufacturing and more reliable in operation. Winding can be used, for example, in single-machine frequency and phase converters, non-contact AC machines with a combined pathogen, etc.

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sg

one,

C} FIG. five

Claims (1)

THREE-PHASE COMBINED STATOR WINDING FOR ELECTRIC AC MACHINES, for example, synchronous with excitation from the third harmonic of the magnetic field, two-layer, containing uniformly distributed coil groups and connected to a star with two parallel branches and zero leads, which are clamps for the pole with Zp, steps and numbers of turns so that the products of their winding coefficients by the number of turns for the polar network p are equal, characterized in that, in order to simplify the design and manufacturing technology, increase the use of copper and improve the parameters winding comprises 6p coil groups with k 3 concentric coils in a kaeda with steps Y = Yμ - 2 (i-1) connected in series * into three subgroups, the first of which contains from adjacent coils ^ starting from the outer ^ the second - from * coils starting from numbers * = c + 1, the third - the remaining coils of the group, the subgroups of the same name are connected in a circuit and in each phase the chains of the subgroups of the second and first for one branch, the second and third for the other branch are connected in series, the beginning of the branches form phase clamps, and the ends are connected to the indicated zero conclusions, and in the cayed phase of the point the connections of the second subgroups with the first and third are interconnected for the coils of the second subgroups, as well as for the coils with the same numbers <, whose sides are in common grooves ^ the number of turns is V / j (and for the coils of the first, the subgroups ϊ · .χ, third, V / _K t X, where Зк — Ί '£ Уц £ Зк is the pitch of the external coils _χ 1 = 1,2, ... b is the number of the coil in the group, c = £ * = k /. 3 for% multiple three, c = - · and c * = k = 2s for other values of k, X is determined from the condition that the products of the numbers of turns of the branches are equal to their winding coefficients for the polarity p. .1128335 I