SU879712A1 - Three-phase combined winding of ac electric machines - Google Patents

Description

one

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 a magnetic field.

Combined windings of alternating current machines are known, made in the form of parallel branches of polarity P, each of which consists of spatially shifted coils and has the findings of midpoints, which are the beginning of the phases of polarity Pn. The angle between the two coils of the branch coil is equal to x rad.

and the number of turns of the coils is proportional to the angle of their shift relative to the axis

branches

Their disadvantages are the complexity of the design, the large losses from the balancing currents and the limited area of application. nothing

Known and combined winding with the ratio l ° made of 12 evenly distributed coil groups connected in two parallel branches with zero leads, is a clamp for polarity

РгСз. -.

Their disadvantage is limited use.

The third-harmonic excitation machine is also known to have a field, on the stator of which a three-phase winding is laid, which functions as the main and additional windings with a polarity of p and Ayr and containing evenly distributed coils connected in a star with two parallel branches and zero outputs connected through a rectifier with different steps and numbers of turns, so that the product of their winding coefficients and the number of turns for polarity p are equal, and for Zr - are different among themselves 3. Anchor15 for the winding of this machine are the closest to the invention in technical essence and the achieved result.

20

However, it has a number of drawbacks: the complexity of the design and manufacturing technology due to the uneven arrangement of the multi-step coils; and solitary and uneven

25 filling the groove layer; distinguishing between active and inductive resistances of branches; bad form of the NS curve and low about "5-winding polarity coefficient Зр; the inability to use to excite the energy of the first

thirty

harmonics floor, which degrades the performance of the machine at low loads; the impossibility of connecting the winding in a triangle, which limits its functional capabilities. The purpose of the invention is to simplify the construction and manufacturing technology, increase the use of copper and improve parameters by making coils uniformly curved, completely and evenly filling the groove layer, increasing the winding ratio and improving the NS curve for polarity, using the first harmonic of the field and eliminating EMF triple frequency at the terminals of the phase with pole size p.

This goal is achieved by the fact that the h ± o winding contains 6 coil groups with k 3 equal-turn concentric coils in each with steps Yj.2 ()) connected in series into three subgroups, the first of which contains the coils from the next with the outer coils, and the second coils starting from. the numbers i c + 1 third are the remaining coils of the group, the same subgroups are connected in a chain and in each phase there are connected in series the second, first and third subgroups in the first p groups of phase for one branch, the second, third and first subgroups in the second p groups of f For the other branch, the beginnings and ends of the branches form clamps of the beginnings and ends of the phases connected into a star or, at 3k-l, into a triangle, and in each phase the junction points of the second subgroups with the first and third are connected between each other and additional conclusions are made from the points of connection of the first subgroups with the third, where p is the winding pole for the first harmonic field; ЗЧ-1 $ Уц 3k - spacing of external coils i 1, .2, ... k - the number of the coil in the group / s with - R / 3 with a multiple of three, and with k - 2 with other values of k.

1 shows a diagram of the proposed winding with and in FIG. 2 and 3 are diagrams of the emf phase for the polarity of p and 3p; FIG. 4 is a diagram of the proposed winding with; and FIG. 5 is an emf phase diagram for polarity p; in fig. b and 7 - the same as in figure 4, 5, but for the winding with, and.

The winding (figure 1) is made of three-phase two-layer, and contains coil groups with numbers from 1 to 6. The groups are made of concentric coils with steps Yj 3k-l-2 (i-1) 8,6,4f where i 1,2 , 3 - number. Coils in groups In phase with the clips C1 - C4 coils of groups 1 and 4 are connected - middle, outer, inner coils for one

branches and middle inner outer coil for another branch. The points of connection of the middle coils with the external and internal coils are interconnected, and additional terminals 01-04 are made from the points of connection of the external to internal coils. Phase С2-С5 is made similarly with additional conclusions 02-05 groups, 3, b and SZ-Sat with additional conclusions 03-06 from groups 5.2.

On the EMF diagrams (Figures 2, 3, 5, 7, the EMF vectors of the first subgroups are assigned numbers of groups, the second subgroups are numbers with a stroke, and a third a subgroup are the same numbers with two strokes.

From the diagrams (phi9.2) for the polarity of p, it can be seen that at conclusions 01-04 this

c - Kur- U p .0 M.f.

I field induces EMF

tnill / J c / t, j) (t

FR

P SKvp FR

0

Efr, where Efr-EMF phase C1-C4, 0.985; 1 (;, p - 0.8bb; K1, p 0.643; shortening coefficients. EMF Ep phases form a three-phase symmetric system. The winding coefficient of the winding (Fig. For polarity p is equal to

 0.831.

TO

05Р

From the diagram (fig. 3} for the polarity Zr it is clear that this field is on the terminals

C1-C4 induces emf. - | .E, p-, o,

where Eflr- emf tripled frequency phase

01-04; CR -0.866; kA o;

0.866.

The second subgroups (middle coils) with are removed from the circuit between 01-04, which increases the winding coefficient for the polarity Zpcrr, p 0.866, the EMF form a single-phase system. Since the LRT winding can be connected in a triangle. The product KORR Kog ", 0.831-0.866 0.72 and describes the degree of use

winding (fig.) .. for winding (fig 4) and,

Kross 0828, Kog, p 0.837 and COBR-Ober OESE, Er 0.13GE (figure 5) 0.

For winding (fig. 6) with p 2, YI 3k-2 (i-l) 9, 7, 5, F.p- 0.0665 Efr Chfig. 7), E O, 0.9020.75 0.677. Since the length of the winding EZR ° ® ® can only be connected into a star.

In Figures 1, 4, 6, the upper row of arrows shows the direction of the currents when the winding is powered through the terminals

5 с1, С2, СЗ three-phase; - current (for the point in time when the current in the C1 phase has an amplitude value}, and the lower p dd is when the winding is supplied via additional terminals 01-04,

0 02-05, 03-06 with single-phase current.

Claims (3)

Compared to the prototype winding, having Z 36 36, steps B and 6, Kogp-0.881- 0.244 0.215, in the winding according to the invention, copper is 0.72: 0.215 3.35 times higher for winding in FIG. and 0.677: 0.215 3.15 times for winding in FIG. The winding is characterized by simplicity of design and manufacturing technology, it has a higher use of copper and better forms of NA curves compared to the prototype. It can also be connected in a triangle, which expands its functionality. The invention of the three-phase combined winding of electric machines of alternating current, for example, synchronous with third-harmonic excitation, is a two-layer field, containing uniformly distributed coil groups with different coils, connected in phase into two parallel branches with additional leads, characterized in that in order to control the construction design and technology of increasing the use of copper and improving the parameters, the winding contains 6p coil groups with k concentric coils in each step mi Y (i - 1) t connected in series into three subgroups, the first of which contains from neighboring coils, starting with the outer, the second from the coils, starting with the number t + 1, one third - the remaining coils of the group, the subgroups of the same name pi and in each phase are connected in series the chains of the second, first and third subgroups in the first p groups of phase for one branch, the second, third and first subgroups - in the second p groups for the other branch, the beginnings and ends of the branches form clamps of the beginnings and ends of the phases, in each phase, the connection points of the subgroups the first and the third are interconnected and additional leads are made from the connection points of the first subgroups with the third, where p is the winding pole for the first harmonic field; 3k - l YH - step of the outer coils; i 1} 2,.,. k is the coil number in the group; c, c, "k / 3 with k multiple of three, (ktl) / 3 and k-2c with other values of k. Sources; information taken into account during the examination 1. USSR author's certificate 243033, cl. H 03 K 3/00, 1973, 2. Authors certificate of the USSR 382198, cl. H 02 K 3/00, 1973. 3. USSR author's certificate №.313503, cl. H 02 K 19/36, 1975. .f Ipif f.jlffJ 04 .e ffff / ff TU