SU687534A1 - Combined winding of ac electric machines - Google Patents

Description

one

The invention relates to windings of alternating current machines and can be used in single-machine frequency and number phase converters.

The C9-spaced windings of electrical machines of alternating current are known, made in the form of pairs of branches for one button, p, each of which consists of spatially shifted coils and has conclusions from the middle points, which are the beginning of the phases for the other palus pj 1.

The disadvantages of such windings are the complexity of the design and manufacturing technology.

Also known is the combined winding of electric alternating current multi-phase single-phase multiunia made of concentric coils forming 2 m identical coil groups, with coil groups shifted by 1G radian 2 included in each phase.

This winding is closest to the invention in its technical essence and the achieved result.

The purpose of the invention is to improve the use of copper.

This is achieved by the fact that both sides of the coils of each group occupy an area equal to the radian; with an odd number of coils in a group, the average coils of each group have twice the number of turns as compared with the external and internal coils, where

t is the number of phases, odd, greater than one, the internal coil has

0 half the number of turns and twice the cross section of the conductor compared with the other coils of the group.

FIG. 1 shows a winding diagram with a series connection of cat5 sheche 1X groups for a three-phase winding; in fig. 2 - integral curve of its magnetizing sy.py (ns); in fig. 3 is a three-phase winding circuit with two outputs of zero points; on

0 fig. 4 is an integral curve of the NS winding in FIG. 3 for P.J polarity; FIGS. 5 and 6 show EMF stars of coil groups for 2p 10 and 2p 2-pole fields; in fig. 7 - scheme

5 of the proposed winding; in fig. 8 curve of its magnetizing force; in fig. 9 is a diagram of the proposed winding with two zero leads; FIG. 10 shows its curvature N. for; poles

Q P.J 3; in fig. 11, 12 and 13 -

The emf of coil groups is similarly polarized for p 4, p 2. p, 3.

The winding (see Fig. 1) is three-phase (t 3), single-layer, made in Z 35 grooves and contains 2 t 6 equally distributed coil groups, each of which is made of three concentric

6

neighboring

coils and takes

2t

grooves. The coil groups of imimot numbers from 1 to b, the first and second groups of phase С 1-е 4 are shifted by 1Г radian and switched on counter (groups from numbers 1 and 4). Phases С2-С5 and СЗ-С6 are made in the same way and their groups alternate by d intervals in two groups. In each group, the average coil has twice the number of turns as compared to the other coils of the group.

The integral curve of the magnetizing force (see FIG. 2) is constructed for the point in time when the current in the C1-C4 phase has the maximum value. The ordinates of the curve n, p. proportional to the number of turns of the coils. The curve is decomposed into two oppositely rotating harmonics with pole numbers 2p 2 (t + 2) 10 and 2p.j 2 (t - 2) 2f for which the winding coefficients are: 0.793, Kosz 0.257 and KO, O 0.204, With equal turns The coils of the winding of FIG. 1 have: KOS.-IO 0.736, K 0.257 and KOS-IO OB.2 0.189.

The winding, shown in fig.Z, is made with two pins zero points. Here, for each phase, the beginning of the first group and the end of the second are connected to common points, which are the conclusions of the beginning of the phases (for example, dp of phase C1 is the beginning of group 1 and the end of group 4), and the beginning of groups of phases are combined into one (pin 01) and the ends of the first groups - to the other (conclusion 02) around the points, which are the conclusions of a dp pole of 2p 4in. 12, Thus, the winding works simultaneously as 2p 10, 2p2 2 and 2pj 12 - pole.

FIG. 4 shows the intrinsic curve of the n. The windings of FIG. 3 dp of polarity 2p 12, built in the direction of the currents in the winding feeding it through pins 01 and 02.

On the EMF stars (see FIGS. 5 and 6), the numbers of the coil winding groups are assigned to the vectors.

The winding of FIG. 7 is single-layered in Z 36 slots and contains b evenly distributed odioiakovy coil groups occupying each 2/6 of the adjacent grooves and having numbers from 1 to 6, each group is made of concentric coils, and the inner coil of the group has twice the number turns and double the conductor cross section

compared to other coil groups. In phase, the groups shifted by are connected in series. , and the beginning of the phases are shifted to 2nd / 3 rad., i.e. in phase-C1-C4 included according to group numbers 1 and 4, in phase C2C5 - groups 3 and b, and in phase SZ-Sat groups 5 and 2. Curve n.s. windings {shown in FIG. 8 for the point in time when the current in phase C1-C4 has

the maximum value, and is decomposed into two counter-rotating harmonics with a number of polarities 2p "8 and 2p ,, j 4. Winding factors for these harmonics are equal to Koe.s

 0.808, K05.4. Of542 and the amplitude of the 2p2 pole harmonic is 134% of the amplitude of the NS. c 2p V. The product 0.438 characterizes the use of copper winding (see Fig. 7), working as a combination with the numbers of pairs

poles 4 ti2. 2

FIG. 9 shows the scheme of the proposed winding, made with two

pins zero points. The beginnings of the katu (Shechniy groups 1 and 4, Zi6.5 and 2 are connected to common points, which are conclusions of the beginnings of phases C1, C2 and Sz. The ends of groups of neighboring phases are connected to pin 01 (ends of groups 4, b and 2) and 02

(the ends of the groups If 3 and 5). On terminals 01 and 02, there is no alternating voltage applied to terminals C1, C2 and C3, due to the symmetry of the parallel branches. Curve ns ,. windings of FIG. 9

when powered by single phase or direct current, is shown in FIG. 4. The winding of FIG. 3 is aligned for the poles of the p 4, p „2 and p 3, and for the poles of p, it

is single phase with respect to pins 01 and 02.

Claims (3)

1. The combined winding of electric machines of alternating current is multi-phase single-layer, made of concentric coils forming 0 2in identical coil groups, with coil groups shifted by 1 radian included in each phase, characterized in that, in order to improve the use of media, both sides of the coils of each group occupy an area equal to radians. 2. Winding POP.1, characterized in that with an odd number of coils in a group, the middle coils of each group and twice the pain, the neck number of turns compared with the external and internal coils, where m is the number of phases, odd, more than one. 3. POP.1 winding, differing from 5 to 5 with a &l; that the inner coil has half the number of viils and twice the conductor cross section as compared with the rest of the TyyUKtiMH group. Sources of information taken in the examination   7 43 FIG. 1. Authors certificate of the USSR 243033, cl. H 02 K 3/00, 1973. 2. Author's certificate of the USSR 532153, cl. H 02 K 3/28, 1976. J, J p (GS 35 f I 4rit 6 g FIG. 13