SU756546A1 - Winding switchable by 10-2 poles - Google Patents

Description

The invention relates to electrical engineering and can be used to create multi-speed electric motors.

A three-phase pole-selectable winding for 10–2 poles is known, containing 30 coil phases in three phases, two coils in each group, with six coil groups divided into two semi-coil groups each £!]. The winding has six leads and each phase consists of eight identical coil groups with an integer number of coils and four semi-coil groups also with the same number of coils.

However, the known winding is feasible only at 60 or when the number of slots on the stator is a multiple of 60.

Also known is a 10-2 pole winding consisting of 30 coil groups with different numbers of coils in groups [2].

In each phase there are 10 coil groups whose numbers can be determined from the Expression (81-7) + 3ι, where 1 = 1,2,3 is the phase number, ι - takes successively 0 »1, ... g 9.

However, this winding is feasible only when the number of slots ND stator is equal to

2

72. In each phase in this case, in 10 coil groups 24 coils are distributed as follows. 1-3-4-3-1-1-1-3-4-3-1. When switching to two poles, the current 5 is reversed in those groups where the number of coils is three. With such a switch, the same number of coils is included in both parallel branches. With smaller numbers of grooves, it is not possible to achieve equality of the coils in parallel branches.

Also known is a winding of 10-2 poles, three-phase, containing 24 15 coil groups with successive alternation of two coil groups with the number of coils determined by the closest integer from the ratio 2/56, and two coil groups with the number of cables of 20 carcasses determined by the closest integer from. ratios 18/18, with the first coil group containing the number of coils closest to 2/56, and the second and third coil groups 25 contain the number of coils closest to 2/18 pins from 8 ϊ - 7 coil groups [3].

This winding is closest to the invention of the technical essence 30 and the achieved result.

3

756546

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A disadvantage of the known winding is a large number of conclusions and a relatively low distribution coefficient, affecting the consumption of the magnet wire.

The aim of the invention is to reduce the number of conclusions from the winding and reduce the consumption of ^ winding wire.

The goal is achieved by the fact that in phase the coil groups in the sequence 8ϊ-7, 81-2, 81 + 5, 8 (+10, 81 + 12,

8Ϊ + 7, 81, 81-5, with additional conclusions taken from 81-5 and 81 + 10 coil groups, where 1 is the phase number, Ζ is the number of coils in the winding.

In FIG. 1 shows the unfolded winding pattern) of FIG. 2 - the scheme of intraphase connections? in fig. 3 and 4 - curves of magnetizing forces.

The coil consists of 24 coil groups (Fig. 1) with successive alternation of two groups with the number of coils equal to £ / 36 = 1, and two groups with the number of coils equal to 7./18 = 2.

The winding contains nine conclusions (A |, g, B |, B?,, C ι, (-2> Cd),

what provides switching under the scheme ψ / dd. When switching circuits Υ /, the winding can have six pins. The phase includes (figure 2, groups in a single-turn design) alternately according to and counter-coil groups, the numbers of which are determined in accordance with the series 81-7, 81-2, 81 + 5, 81 + 10, 81 + 12, 81 +7, 8ί, 81-5, where 1 is the number of the corresponding phase. For the first phase, these are 1,6,13, 18,20,15,8 and '3 coil groups.

FIG. 3 and 4 give a visual representation of the forms of magnetizing forces. The curves are plotted for the point in time when the current in phase A is maximum. The recommended step is y = 11, with the highest-quality harmonic composition of the curves of magnetizing forces taking place at a value of winding coefficients K _{S) o} = 0.9 3 and K _OBg = 0.67.

The ratio of induction in the air gap with switching schemes γ / dd V _{| 0} / V ₂ = 1 / 0.9, and when U / ΥΥ = 1/0, 0.56.

To reduce the lower parasitic harmonics at 2p = 10 and eliminate equalizing currents in parallel branches at 2p = 2, the number of turns in the coils of the coil groups of 1 coil should be approximately 83% of the number of turns in the coils of the coil groups of 2 coils.

Claims (1)

Claim A pole-switched winding 10-2 poles, three-phase, consisting of 24 coil groups with successive alternation of two coil groups with the number of coils determined by the closest integer from the ratio 2/2> 6, and two hatchez groups with the number of coils defined by the closest integer from ratios 2/18, while the first coil group contains the number of coils, the nearest κΖ / Fb, and the second and third coil groups contain the number of coils, the closest κΖ / Ι8ο conclusions from 81-7 coil groups, characterized in that, in order to reduce the numberConclusions and consumption of the magnet wire, the phase included in series alternately according to and meet the coil groups, whose numbers are determined in accordance with the numerical series: 81-7, 81—2, 81 + 5, 81 + 10, 81 + 12, 81 + 7 , 8Ϊ, 8 <-5, and the conclusions are from 81 - 5 th 81 + 10 coil groups, where ί is the phase number; 1 - the number of coils g winding.