SU1539905A1 - Three-phase winding for combined electric machine - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to reduce losses in copper by reducing the EMF of mutual induction from the floor with a polarity of Pb = 1, as well as improving the electromagnetic parameters by increasing the winding coefficient and reducing the differential dissipation of the winding. The winding with the pole pair numbers of fields P = 7 and P = 1 is made two-layer with a pole P = 7 at Z = 54 slots of 6P = 42 coil groups with coils step of grooves Y _n = 3 and with the coil group for a number of 2,112,111 was repeated six times. Phases contain groups with numbers 1 + 3C, 3 + 3C, 5 + 3C, respectively, in the first, second, third phases, included in each phase successively with the opposite inclusion of even groups are relatively odd, where C = 0, 1, 2, ... (2P-1). For groups with numbers 516K, 6 + 7K, 7 + 7K, the coils each contain 1.1W _K turns, and for the other groups, the coils each contain 0.9W _K turns, where K = 1, 2, ... (P-2) and 2W _K is the number of turns in the slot. Winding is used in electric machines with two opposite-pole magnetic fields in a common magnetic circuit, for example, in single-machine frequency and phase converters. 4 il.

Description

The invention relates to the core windings of electrical alternating current machines with two opposite-pole magnetic fields in a common magnetic core and can be used, for example, in single-machine frequency and number phase converters.

The aim of the invention is to reduce copper losses by reducing the EMF of mutual induction from a field with a polarity p 1, as well as improving the electromagnetic parameters by increasing the winding coefficient and reducing the differential dissipation of the winding.

FIG. 1 shows alternations of phase winding zones; in fig. 2 and 3 are diagrams of emf of phase coils for, pole length p 7 (Fig. 2) and p 1 (Fig. 3); in fig. 4 - MDS winding polygon for polarity p 7.

The winding is made with polarity p 7 two-layer (Fig. 1), three-phase in the grooves of the coil groups with numbers from 1G to 42G with a step of coils in the grooves at 3, has the number of grooves per pole and Phase q 54/42 9/7 and grouping coils in groups according to row 2112111, repeated six times „phases contain groups with numbers

+ ZS, 3 + ZS, 5 + ZS, respectively, in the first and third phases, where with 0, 1, 2,, .., (2р-1 13), connected in each phase in series with the even inclusion of even groups, odd (groups 1G, 4G, 7G, SOUTH, 13G, 16G, 19 / G, 22G, 25G, 28G, 31G, 34G, 371% 40G in the first phase - in Fig. 1). Phase zones are designated as A and X in the first phase, B and Y in the second phase, C and Z in the third phase, where zones A, B, C correspond according to the sides of r | rupp included in the phases, and zones X, Y, Z - counter included; winding grooves are numbered from 1 to 54 numbers. In FIG. 2 and 3 the circle is divided into parts (d 360 ° / 54 20 ° / 3) and the number of slots of the upper layer of the coils is assigned to the EMF vectors.

From FIG. 2 that the EMF of mutual induction in the phase of the winding (zones A and X) of the TF field with polarity with equal-turn coils (w turns) is equal (the projection of the vectors on the symmetry axis): DE 4wK (0.5 + cos160 ° / 3 -cos80 ° - cos220 ° / 3 - cos80 ° / 3) sin (F 3/54) -0.1785wK, where 54/2 27 is the pole division for p 1,

/ Ut reduce this EMF coil windings are made of different turns (see Fig. 1). For groups with numbers 5 + 7k, b + 7k, 7 + 7k, the number of turns of the coils is xw ,, and for the remaining groups (with numbers 1 + 7k, 2 + 7k, 3 + 7k, 4 + 7k) the number of turns equal to ( 2 - x) w к, for EMF E., phases are obtained; DE (0.5 + cos160 ° / 3- (2-x) (cosSO0 + cos22073 + coc80 ° / 3) xsin (r3 / 54) (1.7026x - 1.8811) wk, whence we define x at LE7 0 1S1

and (2) 0.9. In this case, the EMF of the phase of the winding for the polarity P 7 (Fig. 2) is obtained equal to (projection of vectors nz symmetry axis): Е-, 4wfe 1, 140.5 + + cos40 ° / 3) + 0.9 (cos20 ° / 3 + cos 20 ° + + cos8073) Jtsin (fT7 / 54) 15.6526wK, t where 54/14 is the pole division for Winding coefficient is equal to

 5.6525wR / 17.4wK 0.8996, where w (1.1-6 + 0.9-12) wk 17.4wK is the number of turns of the phase.

The outer polygon MDS of the winding (figs 1) is constructed in FIG. 4 using an auxiliary triangular mesh; the layers of the groove with 1,1wp and 0,9wK turns correspond to 5.5 and 4.5 sides of the mesh; phase vector current vectors (FIG. 1) are depicted in the center of FIG. 4. According to FIG. 4 are determined: R2a 14.8. / 3 - the square of the average radius of the slot points; R2 (54x 0.8996 / 7U2 (17.4 / 18) 2 4,559782 - the square of the radius of the circle for the main harmonic MDS; bq (R2 / R2 - - 1) -100 8,192% is the differential scattering coefficient characterizing the percentage Higher (and lower) harmonic in the MDS winding curve. When winding Fig. 1 with raviovitka coils, its electromagnetic parameters are equal (on the inner polygon of Fig. 4, where one layer of the groove corresponds to two sides of the grid): K0b - m 0.8978; 16/3; R2 4.860163 and 736%

Thus, the proposed winding with the same copper consumption for the prototype copper consumption has a significantly lower EMF of mutual induction (LE "0 from the floor with p 1 and, therefore, lower copper losses from equalizing currents, as well as a higher winding ratio (0.8996 (/ 0.8978 times) and less differential scattering (9.736 / 8.192 1.19 times).

Claims (1)

Invention Formula The three-phase winding for an electric machine of the combined type with the numbers of pole pairs of fields p 7 and p 1 is double-layered in z 54 slots of k 54 coils with a step along the slots 3 and 6p of 42 coil groups with numbers from 1G to 42G, containing groups of 1 + 3k, 3 + 3k, 5 + 3k respectively in the first, second, and third phases, connected in each phase successively with the opposite inclusion of even groups of relatively odd and with the terminals of the beginnings and ends of the phases from the beginnings of groups 1G, 5G, 29G and 40G, 12, 261% characterized in that, in order to reduce copper losses By reducing the EMF of mutual induction from the floor with a pole ratio p 1, as well as by improving the electromagnetic parameters by increasing the winding coefficient and reducing the differential scattering of the winding, the groups with numbers 1 + 7c, 4 + 7c contain two coils, and the other groups contain one coil, and the number of turns coils are equal to XWK for groups with numbers 1 + 7s, 2 + 7s, 3 + 7s, 4 + 7s and (2-x) wK for groups with numbers 5 + 7s, 6 + 7s, 7 + 7s, where k 0, 1 , 2 (2p-1); with 0, 1, 2 (p-2), and the value x 0.85-0.95 and is selected from the condition of obtaining the target number of turns xwk. ff- V 7G SOUTH (ZG 1VG KG 21G 25G IG at G “IG 37G Sh t 3 f 7 $ I in IS I Y I I 23 25 2 29 I 33 3 17 39 1 43 $ 4G 9 I I f-i ,, l.-1-1. ., i. I .. -Ur m. H VSb--. g i-m-hi t l i i -. I I I T1. T I I11 ..; i y l y iЈ. M i I1 - ...- f r i l .-. ЛШрГсуМ г BM с в у фТТПуТТгг with fyu | dsc / il1g H ZM l-X kjgilPM lg gEli IJHL & "City / 7.f 25 27 0 //. J I Fy