SU1674320A1 - Three-phase two-layer pole-switched winding - Google Patents

Abstract

The invention relates to electrical engineering and can be used in electric motors with switching numbers of pole pairs. The purpose of the invention is to improve the use of active materials. The pole-winding winding with the ratio of the numbers of pole pairs 3Q / 4Q contains 72Q coils of the same pitch, evenly distributed across the magnetic core grooves, which connect three three-phase stars with nine additional branches to the circuit. Given the distribution of coils in the phases of stars and additional branches m. 5 Il.

Description

SP

with

The invention relates to electrical engineering and can be used, for example, in electric motors with switching numbers of pole pairs.

The aim of the invention is to expand the scope and improve the utilization of active materials.

FIG. 1, 2 shows the winding scheme; in fig. 3 is a diagram of the connection of the winding branches; in fig. 4 and 5 are the magnetizing force curves.

A three-phase two-layer pole-switchable winding with q 1 per ratio of pole pairs 3/4, in steps of q 12, consists of 72 coils, with serial numbers from 1 to 72, which are connected into a circuit with three three-phase stars and three groups of three additional parallel branches in each, in the first branch of the first star, the coils with

order numbers 1, 3, 19, 21 and post-back-counter to them are coils with pitch numbers 10, 12, coils with order numbers 25, 27, 43, 45 are in the second branch of the first star and successively to them are coils with serial numbers 34, 36. The third branch of the first star successively agrees with Kagushki with serial numbers 49.51, 67 69 and successively opposite them, coils with numbers 58, 60, in the feather branch of the second star, the coils with sequence numbers 55 57 and sequence-counter thereto - coil sequence numbers 48, 65, 64, 66, the second branch of the second star-sequentially according Ka tuiki included with the sequence numbers 7, 9 and successively opposite thereto - spool

СЬ VJ

WITH

go

about

serial numbers 72,17,16.18, in the third branch of the second star, the coils with serial numbers 31, 33 and in series, opposite to them, coils with serial numbers 24, 41, 40, 42, in the first branch of the third stars in series-according to included coils with serial numbers 37, 39 and series-opposite to them-coils with sequence numbers 29. 46, 28, 30, in the second branch of the third race, consistently included coils with sequence numbers 61, 63 and consistently, counter to them - to l. ears with order numbers 53, 70, 52 54, in the third branch of the third star, successively according to included coils with order numbers 13,15 and successively opposite to them coils with order numbers 5, 22, 4 , 6, in the first parallel branch of the first group of complementary avsvey- series-according to included coils with serial numbers 2, 38, in the second parallel branch in series-according to included coils with sequence numbers -11, -47, in the third parallel branch consistently according to the coil with order numbers 20, 56, the first parallel branch of the second group of additional branches are serially-consistently included ka i ears with serial numbers 26, 62, the second parallel branch of the serial-consistently includes coils with serial numbers -35, -71, the third parallel veggie sequentially-consistently coils with sequence numbers 8, 44 are included, in the first parallel branch of the third group of additional branches there are series-according coils with sequence numbers 14.50, the second parallel branch of series-according are included carcasses with serial numbers -23, -59, in the third parallel branch, the coils with serial numbers 32, 68 are included in the third parallel branch, the sign - with the serial number of the coils of additional branches corresponds to their counter-inclusion with respect to the coils, the numbers of which are given without sign.

FIG. 3 shows the electrical circuit of the pole-switched winding consisting of three three-phase stars and three groups of three additional parallel branches in each, with the beginning of the first branches of all stars and the ends of additional parallel branches with leads from the beginning of the 1st and from the ends of the 48th, 28 coils from the ends of the 38th, 56th and from the beginning of the 47th coils, the beginning of the second "branches of all the stars and the ends of the additional parallel branches with conclusions from the beginning of the 25th, 7th and from the end of the 52nd coils from the ends of the 44th, 62nd and from the beginning of the 71st coils, the beginning of the third branches of all the stars and the ends additional parallel branches with conclusions but the beginning of the 49th and from the ends of the 4th 24th coils, from the ends of the 50th, 68th and from the beginning of the 59th coils, respectively, are combined into common points. The node with a branch D is joined by the beginnings of parallel branches of the first group of additional branches with leads from the beginnings of the 2nd, 20th and from the end of the 11th coils, into the node with a branch E - the beginnings of parallel branches of the second group of additional branches with leads from the beginnings of 8 th, 26th and from the end of the 35th coils, and node F - the beginning of the parallel branches of the third group of additional branches with conclusions from the beginning of the 14th, 32nd and from the end of the 23rd coils, and the zero points are formed at the first stars (pin A) with leads from the ends of the 21st, 45th, 69th coils, of the second star (pin B) with conclusions from the beginnings of the 66th, 72nd, 4 The 2nd coil, the third star (conclusion C), the conclusions from the beginnings of 4b-th. 70th, 22nd coils.

When a three-phase power supply is connected to terminals A, B, C, a rotating rotational wave arises in the s / z gap, while an eight-pole rotational power is generated when the power supply terminals D, E, F are fed. The patterns of magnetizing forces produced by the pole-switched winding are shown in FIG. 4, 5.

When the number of poles is 2p2 8, all 72 coils are included in the circuit, in three additional parallel branches x of three groups, respectively, EMFs are created that coincide in phase and equal in magnitude. When the number of poles is 2p 6, coils connected to additional branches are de-energized and included in the circuit 54 coils which are combined into three three phase stars. In the contours formed by the coils of the additional branches, the equilibrium currents are absent for both numbers of poles.

The winding on the side of 3 pairs of poles is symmetrical, and on the side of 4 pairs of poles, the divergence of the EMF vectors (created by an eight-pole rotating magnetic field) of the branches of the second star of the same name with respect to the first, first relative to the third star is branches EMF the second and third stars are the same and exceed the emf of the branches of the first star by 1.2%. However, despite the indicated divergence of the EMF vectors in the branches of each of the phases, from the side of eight-points the winding is symmetrical with respect to the power source, as in the branches of x, respectively, the first, second, third three-phase stars and in groups of additional parallel branches of the EMF form perfectly symmetrical three-phase systems. The washing coefficients of the pole-switched winding with 2pi and 2p2 - pole side, respectively, are equal to К0бм.1 0.778 and Кобм.2 0.82.

Claims (1)

The winding connects three three-phase stars with nine additional branches to the circuit. Additional branches increase the number of turns of the phase of the winding from the side of greater polarity and allow to use one voltage as the nominal voltage of the winding from the side of both poles - the voltage of the industrial network, since in this case, the multiplicities of the numbers of pairs of poles and the numbers of turns corresponding to the magnitude of the phase voltage on each side of the winding coincide (these multiplicities, respectively, are 3: 4 and 18:24). The consequence of this is that it is possible to reconcile magnetic inductions, t, e, to choose the same value (adopted for machines of normal performance) magnetic field induction for both poles and thereby greatly improve the use of active materials of the electric machine. Three-phase two-layer pole-switchable winding consisting of uniformly distributed equal-turn coils of the same pitch, uniformly distributed in the grooves, grouped into a scheme, three three-phase stars and three groups of additional parallel branches in each, from common points of the beginning of additional parallel branches and zero points of three-phase stars the conclusions, the ends of the additional branches of the first, second and third groups and the beginning of the first, second and third branches of all three stars, respectively, are combined into common points, exc sistent with the fact that, in order to expand the field of application and improved use of active materials, a winding number ratio the pairs of poles 3q / 4q contain 72q coils and have three groups of three additional parallel branches each, and in the branches of the first star the coils with serial numbers N 72 (q - 1) + 1 + 2 (n - 1 + 12A), N - 72 (q - 1) + 19 + 2 (n - 1 + 12A) and coils with serial numbers N - 72 (q - 1) + 10 + 2 (n - 1 + 12A), in the branch of the second star, the coils with sequence numbers N - 72 (q - 1) + 55 + 2 (n - 1 + + 12A) are included in series and the coils with sequence numbers are in series with them N 72 (q-1) 448 + 17 (n-1) + 24A, N 72 (q-1) + + 64 + 2 (n - 1 + 12A), in the branches of the third star the coils are sequentially according to order with the numbers N 72 (q - 1) + + 37 + 2 (n - 1 + 12A) and successively to them there are coils with the order numbers N 72 (q - 1) + 29 + + 17 (n - 1) + 24A. N 72 (q-1) + 28 + 2 (n - 1 + + 12A) in additional parallel branches of the first group, in series-coils with sequence numbers N (-1) 5 + 2 72 x (q-1) + are included 2 + + 9S - 36 (n - 1), in additional parallel branches of the second group, coils with sequence numbers N (-1) (q-1 + 26 - (- 1) s + 29S + 36 (n -1), in additional parallel branches of the third group, coils with sequence numbers N (- 1) s + 2 x 72 (q - 1) + 14 + 9S + 36 (n - 1), where q 1, are included in series with 2, 3, ... (any integer), A S + + Zr - 3qt, S 0, 1.2, respectively, for the first, second and third branches of three-phase stars and the first, second and third additional branches of each group, t при at N 72q and t 1, if at t 0 N 72q, n takes the values 1 and 2, and r ranges from 0 to q - 1, the sign - at the order of the number of coils of additional branches corresponds to the counter-inclusion with respect to coils, the numbers of which are given without a sign. B Cbfq fig f To UOi69Kl999S9W (9i9 (9 09 6S 8S U 9S SS 4S 45 K IS 09 6 8 It M Sb W L NPKK LЈ g gff g l S  H F e Phage. five H FIG. four