SU756547A1 - Winding switchable by 10-8-6 poles - Google Patents

Description

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

Known winding 12-10-8-6-4 5

poles, containing in phase 8 coil groups with a sinusoidal distribution of the coils in groups. At ten poles, it is included in the network according to the star or triangle pattern, at eight poles it is included in the network along. in the double star scheme, and at 6 poles it is included in the single-phase network by the combined beginnings and the combined ends of the 06- ^ 5 phase coil. , 2,3, s - successively takes values from 0 to 7, United-2Yen countering with the exception of (8t — 7) +3 and (8t-7) +6, and also (8t-7) +15 and (8t -7) +18, which are included according to each other.

25

A disadvantage of the known winding is that with a multiple of three poles, the motor works with a pulsating field and has low energy indices. thirty

2

Also known is the winding, which can also be at 10-8-6 poles, also containing in phase 8 coil groups, coils being distributed in groups also sinusoidally, and groups in semi-phases are connected in opposite directions, and semi-phases between themselves according to [2 ].

A disadvantage of the known winding is also that at 6 poles the engine works with low energy indices.

This solution is closest to the invention according to the technical essence and the problem to be solved.

The aim of the invention is to improve the energy performance of the engine at 6 poles.

The goal is achieved by the fact that (8t-7) + +9 coil group is connected in opposite (8t-7) +21 coil group, where m = 1,2,3.

FIG. 1 shows a detailed winding scheme; in fig. 2 - diagram of intraphase connections of coil groups; in fig. 3-6 - possible schemes for switching the winding into the network.

According to FIG. 1, the winding contains in three phases 24 uniformly distributed coil groups with sinus 3

756547

four

by the ideal law of distribution of coils per phase in 8 coil groups of the phase. The coil groups in phase are interconnected in the following sequence 8t-7, 8t-4,

8t-1, 8t + 2, 8t + 14, 8t + 12, 8t + 8.,

8t + 5. The outputs winding is divided into four equal parts. In total, the winding has 15 terminals A _1g A, C ^.

According to figure 2, the phase contains 8 coil groups. For the first phase it is 1,4,7,10,13,16,19 and 22 coil groups. The groups are interconnected with each other, while the beginning of the 10 group is connected with the beginning of the 22 group.

If the three-phase voltage is applied to the outputs with indices 1 and 3, connecting the winding, for example, with a triangle (fig. 3) we get 10 poles. When summing three-phase voltage on the output, labeled with the index 4, connecting the winding according to the scheme of a double star (figure 4), we get 8 poles. Finally, summing up the single-phase voltage to the combined leads marked with index 2 and the combined leads marked with index 4, connecting between the combined leads with indexes 1 and-3 of the phase-shifting element (figure 5), we get 6 poles. In this case . thanks to the proposed connection of the coil groups, the three-phase winding is converted to two-phase with a spatial phase shift of 90 °. With the help of a capacitor, it is possible to achieve a phase shift of the currents by 90 °, and therefore, a rotating magnetic field.

The parallel branches of the phases at 6 and 8 poles are balanced.

With the considered schemes of conjugation of phases and with the step indicated on

figure 1, the ratio of winding coefficients K ^ u / K ^ / K ^ b = 0.78 / 0.82 / 0.65. The ratio of inductions in the air gap is, ,,, / Ββ / Βί, = 1 / 0.86 / 0.84.

According to FIG. 6, the winding at 10 poles can also be turned on by a star, while the outputs А {, Βι, Οι can be combined and the phase shifting element C is attached to them. , B ^, C ₃ . For 8 and 6 poles, the winding is also turned on, as shown in figure 4 and figure 5. The circuit in FIG. 6 can be used, for example, with a step y = 5 for driving the fans.

Claims (1)

Claim A pole-switchable winding of 10-8-6 poles, containing 24 coil groups, including coil groups in phase, the numbers of which are determined from the expression (8t-7) + Zg, with the opposite inclusion of neighboring coil groups in semi-phases, characterized improve the energy performance with a multiple of three poles (8ш-7) +9 coil group is connected in opposite with (8ш-7) +21 coil group, where w = 1,2,3, I - consistently takes the value of 0,1,2, ..., 7.