RU1803953C - Double-layer multiphase winding of ac machine - Google Patents

Abstract

Usage: in medium power asynchronous motors with mechanized laying of windings. SUMMARY OF THE INVENTION: a winding in each phase contains 2p identical coil groups of q concentric coils in each. The largest step of the coils is q-1, and the sides of the coils of the same phase with this step are located in adjacent grooves. 3 silt, 2 tablets

Description

The invention relates to electrical engineering, in particular to medium-power induction motors of general industrial and special purpose with mechanized stator placement

WINDING.

The aim of the invention is to increase the use of the active volume of the mine by uniformly filling p and the basics and to improve the use of copper winding by reducing the average pitch of its turns.

This goal is achieved by the fact that in the well-known multiphase two-layer winding of an alternating current machine, each of the m-phases contains 2p identical coil groups consisting of q concentric multi-turn and multi-step coils, and the step of each subsequent coil is less than two groove step divisions of the previous coil, the number of turns of the I-uh coil is made in accordance with the ratio

(121-1 2q

With

),

and the step of the i-th coil is made equal to yi mq-2i + 1,

where Wn is the permissible number of turns in each of the grooves according to the conditions of their filling;

, 2, ..., q is the number of the coil in the coil group at the beginning of their numbering from the coil of the largest step;

m 2 is the number of winding phases;

p 1 - the number of pairs of poles of the winding;

I nt - operator to round the number in braces to the nearest integer,

In FIG. 1 schematically shows the structure of one of the coil groups of a multiphase two-layer winding of an alternating current machine with an arbitrary number of phases m and the number of grooves per pole and phase q, indicating the steps of the coils yi expressed in groove divisions; in FIG. 2 - laying scheme

00

about

CJ H)

ate

with

transition winding coil groups for the case of FIG. 3 shows the structure of the phase zone of the winding and the snapping of the coordinate system.

A multiphase two-layer winding of an alternating current machine contains 2p identical coil groups (Fig. 1). Each coil group consists of concentrically arranged coils (1, 2, ........ q).

Number 1 is assigned to the coil with the largest step yi mq-1, the remaining coils are assigned numbers in decreasing order of steps 2, 3, ..., q, and since the step of each subsequent coil is two groove divisions smaller than the step of the previous coil, then the step of the coil with arbitrary number i satisfies the relation

yi mq-2i + 1.

The number of turns of the i-th coil is made according to the ratio

Wi (121-1 2q

)

The magnitude of the steps of the coils in the groove divisions and their number of turns W i, expressed as a fraction of the number of turns of the groove Wn (W i

Wi2 i - 1 TT7 1) for the most

wide three-phase windings with different numbers of grooves per pole and phase q are given in table. 1,

The proposed winding is characterized by uniform filling of the grooves with conductors, because the number of turns of the coils satisfy the ratio

Wi + Wq-i + 1 Wn COnSt,

really:

Wi + Wq-i + 1 „nm-i l-M- -, +) - and Laying in the grooves of the proposed winding is carried out according to well-known algorithms for laying conventional two-layer concentric windings for mechanized laying.

As an example in FIG. 2 shows transition stacking for case i. Such a winding is laid in Z 2mpq 2-3-2 grooves in four transitions, for each of which 2tr / 4 2 3-2 / 4 3 coil groups are stacked with a pitch between them

5

0 5

0

5

0

5

0

5

0

5

 , and a step between transitions.

To indicate the belonging of the coil groups to the individual phases in Fig. 2, different hatching was used: washing - phase A; braid cell - phase C; the direct cell is phase B. The slots from number 27 to number 42 in Fig. 2 are not shown according to the dimensions of the drawing.

For the first transition, three coil groups are stacked, in each of which coils with a step between the coil groups, respectively, belonging to phases A, C, B and located in the grooves:

1 cat. group - grooves 1, 2, 3, 4, 9, 10, 11, 12 (A);

2 cat. group - grooves 17,18,19,20,25, 26, 27, 28 (C);

3rd cat. group - grooves 33, 34, 35, 36.41, 42.43.44 (6).

The stacking of the three coil groups of the second transition begins with a groove 1+, while the groups belonging to phases C, B, A are stacked, respectively, in the grooves

4 cat. group - grooves 5, 6, 7, 8, 13, 14, 15, 16 (C);

5 cat. group - grooves 21,22,23,24,29, 30, 31, 32 (B);

6 cat. group - grooves 37, 38, 39,40, 45, 46, 47, 48 (A).

Laying of the coil groups of the third transition begins with a groove 1 + 2UP 9, while the coil groups fit into the grooves:

7th cat. group grooves 9, 10, 11, 12, 17, 18.19.20 (8);

8 cat. group - grooves 25, 26, 27, 28.33, 34, 35, 36 (A);

9 cat. group - grooves 41, 42, 43, 44.1, 2, 3.4 (C).

Laying of the coil groups of the fourth transition belonging to phases A, C, B, respectively, starts from groove 1 + Zup 13, while the coil groups fit into grooves:

10-a cat, a group of grooves 13, 14, 15, 16, 21,22,23,24 (A);

11 cat. group - grooves 29, 30, 31, 32, 37,38,39,40 (0);

12 cat. group - grooves 45, 46,47,48,5, 6, 7, 8 (B).

At the end of the fourth transition, all coil groups are stacked in the grooves, while the total number of turns in each of the grooves is the same and equal to Wn. Coil groups belonging to each of the phases are connected in series and / or in parallel, forming the required number of parallel branches of the winding. Winding phases

star or triangle connected.

When the winding is connected to a symmetric m-phase current source, the currents flow through the coils of the phase zones formed by two adjacent sides of the pole-coil groups (Fig. 3).

N.S. v -th spatial harmonic created by the i -th groove of an arbitrary phase zone of the winding is determined by the expression

F v (")

Wj

V71

 (a-yi) 1

it follows that the winding coefficient for the vth harmonic of the proposed winding is determined by the expression

"- & - & +5 -5

10

2q

After calculating the sum q of the members of the arithmetic-trigonometric series, we finally obtain

P

where y - (I- 1/2) is the angular coordinate

i-groove, glad. email .;

and - the current coordinate of the bore, glad. email .;

Im is the amplitude of the phase current, A; v 1,2, .. harmonic order. N.S. the v-th spatial harmony | created by two i-th bases symmetrically located relative to the point О is

F2v (a) r Csinv (a-yi) + sin vx

V7t

x (a + yi) 2

 about wi ln

V7t

 cosvy sin va.

Amplitude N.S. q groove pairs of one phase zone of the winding will be determined by the expression

F l wi cosvyi

I 1

 , |, (- (-)

The total number of conductors of one phase zone Mfz of the proposed winding p & obviously

  () qWn.

i 1

 1

2q

.-.

If all the conductors of the phase zone of the UVFs were concentrated in one groove, then the amplitude of the NS of the vth harmonic of such a wrap would be determined by the expression

  УУфз Im Wn Im ЧМ л, тг Ч ---

V31

Vjt

5

sin

Kwj) (

LU

2 m

q sin

nv 2 m q

cos

Vjl

2 m q

The values of the proposed winding in the case of m 3 for the standard composition of harmonics v 2mK + 1,, ± 1, ± 2, ..., are given in table. 2.

Compared with the prototype, the proposed winding is characterized by a lower average step of the coil, the value of which is determined by the formula

-t, -Ts ± 1,

35

i 1

45

fifty

55

40

which leads to a corresponding shortening of the length of the frontal parts of the winding and, consequently, to a reduction in copper consumption due to the uniform filling of the grooves with windings of the winding, the use of the active motor volume by 6-16% is improved (depending on the value of q).

With the same complexity of laying as for conventional concentric two-layer windings, the proposed winding reduces the influence of higher spatial harmonics on the technical and economic performance of the machine.

Claims (1)

SUMMARY OF THE INVENTION A multiphase two-layer winding of an alternating current machine containing in each of m phases 2p identical coil groups consisting of q concentric new-coil and multi-step coils, the step of each subsequent coil being less than two groove divisions of the step of the previous coil, distinguishing that, in order to improve the use of copper windings by reducing the average pitch of the coil and improving the use of the area of the grooves by uniformly filling the winding conductors, the pitch of the coils of the largest pitch is made equal, the sides of the coils of two adjacent groups belonging to the same phase are located in two adjacent grooves, and the number of turns i th coils are made in accordance with the ratio (12i -1 2q ), Steps and number of turns of coils of a coil group of a multiphase two-layer winding machine AC at The values of the coefficients of the proposed winding at and different q 0 where m 2 is the number of winding phases;  - the number of grooves per pole and phase; p 1 - the number of pairs of poles of the winding; Wn is the number of turns of each of the grooves ps under the conditions of the permissible value of the groove fill factor; , 2, ... q - the number of the coil in the coil group at the beginning of their numbering from the coil of the largest step; Int - operator to round the number in square brackets to the nearest integer, Table 1 table 2 i. Uj- td.-1 G - mq. Pazo numbers8 1 3 5 7 3 11 73 75 77 19 t I luyygyyyyyuiyyynyyyi I II fi 2.1 .ll it NepexaioS rooms % r.2