SU1403234A1 - Three-phase combination winding - Google Patents

Abstract

The invention relates to the field of combined windings of alternating current machines. The aim of the invention is to improve the use of the winding. The winding is made of the same spatially shifted 2.1 / 3 rad phase windings connected in a star and connected in series coil groups (G). The number of is equal to twelve. The number of coils in G corresponds to the range of 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1. The first phase includes according to G 1 and G 4, G 6, G 11, numbers groups of other phases alternate at intervals of four groups. The difference is given, the groove grooves. 5 il.

Description

SO YU 00 4 ::

FIG. i

The invention relates to combined windings of alternating current machines and can be used in single-machine frequency converters, in rotary windings of synchronous and asynchronous cascade and mainin double feed.

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

On -fig. 1 shows a circuit of a winding made in Z 30 slots; in fig. 2 - n. with. winding for the time t 0; in fig. 3 - decomposition of n. with. FIG. 2 for two harmonics; in fig. 4 - n. with. windings for the moment of time. t is happy; in fig. 5 - decomposition of n. with. FIG. 4 on D15e harmonics.

The three-phase winding with the ratio of the numbers of pairs of poles P2 / PI 5, is made single-layer of equal-turn coils combined into 12 coil groups with numbers from G 1 to G 12 (Fig. 1).

The number of coils in each coil group is determined by the numerical series 1, 2, 1, 1, I, 2, I, 1, 2, 1, 1.

At the same time, the coil groups G 1, G 5, G 9, i.e. the groups 1- | -4p, where, 1, 2, have a pitch at 71, the coil groups (2 + 4p) have a pitch at 8k, the other coil groups have a pitch at 3k. The winding of phase A consists of according to the included coil group G 1 and counter-included groups G 4, G 6, G 11. The winding of phase B consists of according to the included group G 5 and counter-included groups G 8, 7 10, D 3. The winding of phase C consists of according to the included group G 9 and counter-included groups G 12, G 2, G 7.

Thus, all phase windings; are the same and spatially shifted by

 3 rad., The phase group numbers alternate at intervals of 4 groups. Phase windings are connected to a star.

FIG. 2 shown n. with. The windings shown in FIG. 1, for the time t 0, when the current in phase A is maximum positive, that is, it flows from the beginning of the phase to the end, and the currents in phases B and C are half amplitude negative. Ordinates curve n. with. proportional to the number of turns of the coils and the magnitudes of the currents. FIG. 3 shows the decomposition of the resulting n. with. FIG. 2 on. two harmonics: the first and fifth. FIG. 4 depicted n. with. windings for time t | - glad when the current in phase B is maximum negative, and the currents in phases A and C of half amplitude are positive. FIG. 5 shows the decomposition of the resulting n. with. FIG. 4 for two harmonics: the first and fifth. From the comparison of FIG. 4 and 2, it can be seen that during the time t of the first and fifth harmonic lines n. with. shifted in opposite directions relative to the original position at a distance equal to - | - glad.

Consequently, when the three-phase voltage is connected to terminals A, B, C, the winding creates magnetic fields with numbers of poles 2pi and 2p2 rotating in opposite directions, while the amplitude value of the induction 2pi-pole field is 2 times the amplitude value of the induction 2p2-pole field.

The three-phase winding has winding factors, over a 2p1-pole field

Cob | 0.391 and across the 2p2-POLY field of Cobg

 0.799 and replaces two three-phase windings, a 2p | -pole winding with W | 2 and Cove | 0.96, occupying 1. slots 12 slots, and 2p2-pole winding with W2 5 and Ko «2 1, occupying 30 slots. Since the combined winding occupies only 30 notches instead of 42, saving copper wire is 28.5%.

Claims (1)

Invention Formula The three-phase coil of alternating current electrical current with the ratio of the number of pairs of poles p2 / pi 5/1, made of the same spatially shifted by 2 l; / 3 rad phase windings connected in a star and consisting of sequentially connected coil groups laid in thirty grooves numbers from 1 to 30, characterized in that, in order to improve utilization, the winding is made single-layer of equal-turn coils combined into 12 coil groups with numbers from G 1 to G 12 and with the number of coils in the coil group defined in accordance with the numerical series of 1, 2, 1, I, 1, 2, 1, 1, I, 2, 1, 1, while the coil groups 1 + 4 have a pitch at Ik, the coil groups 2 4-4p have a pitch g / 8y, the rest of the coil groups have a yoke at 3k, the coil group I is laid in slots 1 and 8, the coil group 2 in grooves 5, 6 and 13, 14, the coil group G 3 in grooves 7 and 10, the coil group Г 4 - in grooves 9 and 12, coil group G 5 - in grooves 11 and 18, coil group G 6 - in grooves 15, 16 and 23, 24, coil group G 7 - in grooves 17 and 20, coil group 8 - in grooves 19 and 22, the coil group G 9 - in the grooves 21 and 28, the coil group G 10 - in the grooves 25, 26, 3, 4, coil and group G 11 - in grooves 27 and 30, coil group G 12 - in grooves 29 and 2, in the first phase are included according to the coil group G 1 and head groups G 4, G 6, G 11, the numbers of groups of other phases alternate with an interval in 4 groups, where l O, 1, 2, BUT. // -cf at srig.2 qOu.3 Bg 4 СРе.5