SU1495915A1 - Armature three-phase-one-phase combined winding - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to expand the field of application by making 63 grooves in the windings, as well as improving the parameters by increasing the winding factors. The winding is made of twelve distributed coil groups with two-layer concentric coils and is connected in two parallel three-phase stars with three-phase clamps for polarity P ₁ = 2 and additional single-phase clamps for polarity P ₂ = 6 from the zero points of the stars. The first phase contains the first, fourth, seventh, tenth coil groups and their coils are connected in series to the branches of the stars and into an additional branch, the beginning of which forms the phase clamp, and its end is connected to the beginnings of the branches of the stars of the phase. The coils of the even coil groups are included in the branches opposite to odd, and for the other two phases, the numbers of the coil groups alternate with respect to the first phase at intervals of four and eight groups. The winding is 63 slots, the second, sixth, tenth of the coil groups contain six coils steps of grooves Y _n I = 16-2 (I-1), and the relative coil groups - of five coils Y = 15 pC 2 (K-1), where I = 1-6 and K = 1-5 are the numbers of the coils in the coil groups. In the branches of each phase, they are connected in series for its coil groups of the coil with the numbers K = 1 and I = 1.2 - in the branch of the first star, K = 4.5 and I = 6 - in the branch of the second star, and the remaining coils in the additional branch, 5 Il. 1 tab.

Description

The invention relates to core - windings of electric alternating current machines with two opposite pole magnetic fields in a common magnetic core and can be used, for example, in synchronous machines with excitation systems from a third harmonic magnetic field.

The purpose of the invention is to expand the field of application by performing in 63 slots, as well as improving the parameters by increasing the winding factors.

FIG. 1 shows the scheme of the proposed winding; in fig. 2 - up3149

puppy diagram of compounds of its phase C1; in fig. 3 and 4 are diagrams showing the shift of the axes of the coil groups for the polarity p, 2 and p 6, respectively; in fig. 5 polygon ncs for polarity .pi 2.

; The winding (fig. 1) is double-layered in 63 slots with numbers from 1 to 63, out of twelve coil groups (with numbers from 1G to 12G) with concentric coils. With steps along the grooves y. 16-2 (1-1) 16, 14, 12 | 10, 8, 6 for groups 2G, 6G, SOUTH and

UE 15-2 (k-1) - 15, 13, 11, 9, 7 for other groups, where i 1-6 and k 1-5 are the numbers of coils in the groups. It is connected in two parallel three-phase stars with three-phase

clips C1, C2, Sz for p, 2 and additional clips 01-02 for r. 6 from their zero points. The first phase contains groups 1G, 4G, 7G, and SOH and their coils are sequentially included in the branches of the stars and in the additional net, the beginning of which forms

press phase and its end is connected to the beginning of the branches of the stars of the phases (Fig. 2): coils numbered k 1 and i 1, 2 - to the branch of the first star, k 4, 5 and 1 6-3 branch of the second star, k 2,, 4, 5-in an additional branch, with coils of even groups included opposite relatively odd. For the other two phases, the group numbers alternate with respect to the first phase at intervals of four and eight groups. The axes of the groups are shifted by angles (in electrical degrees: 60 + o for p, 2 (Fig. 3; a (15Vq) and P2 6 (Fig. 4), where q 63/12 5.25 is the number of grooves per pole and phase The EMF of the coil groups form a three-phase system for Pj 2, symmetrical, and for p ,, 6 - a single-phase system with three branches. The EMF of the coils is proportional to their shortening coefficients К yj sin (iT-x. У / 15,75) and К у 11п (1Г.у „/ 5,25), where 63/4 T5.75 and 63/12 5.25 - pole divisions. The data are given in the table.

The emf of the phase branches (Fig. 2), taking into account the shift of the axes of the groups (Fig. 3), for p 2 are: C1 -01 branches, 9972 x (l + 2cosoO + 0.9997 + 0.98483W, 4.9736w, SG-02 branches - :( 0.7818+ ° +0.6428) (1 + 2cosoO + 0.5633.w 4.8336w, that is, they are almost the same and their average value is 4.9036w; branches C1 -СГ -С (0.9626 + + 0.8899) (1 + 2coso) + 0.9309 + 0.8400 + + 0.7.79 cw 8.0397 cw.

The ELS phase is (8.0397c + 4.9036) w when the number of turns in the phase is (9-sec +

+ 6) wj and at c 1.0 get an emf of phase equal to 12.9433wj, and the winding coefficient is equal to 12.9433 / 15 0.8629. For the EMF of the phase, (8, + 4.9036) 12.9433 / - / 3 are obtained / 3 times less, from which 0.32 and 7.4763 / 8.88 0.8419; with 0.5, K g: 0.8499 is obtained. ,

For chain 01-02 with a polarity of p 6, the emf is (0.9749 + 0.8660 + + 0.4339) (1 + 2cos3o () + 0.9972 + 0.8660 + + 0.9749} w, 9.611 7w. when the number of turns of the chain 01-02, equal to 12w ,, H then

5U

Winding Coeffs is equal to 9.6117 / 12 0.8010. Circuit parameters 01-02 do not depend on the coefficient c, and the cross section of the Katutseg wire of the additional branches of the phases varies inversely with this coefficient, and the coefficient c may have other values.

Thus, the proposed winding has electromagnetically independent opposite-pole clamps (the field with p 2 does not induce an emf at clamps 01-02, and the field with p 6 does not induce an emf at linear clamps C1, C2, C3), has an extended scope, as performed in 63 grooves, and higher values of winding coefficients than winding in GZ, for which the number of grooves is 39,, 90 and Koff is 0.706.

FIG. 1, the upper row of arrows shows the directions of the three-phase current when the winding is fed through C1, C2, NW (p 2), and the lower row shows the directions of the single-phase current when the winding is fed through 01-02 (pj 6).

FIG. 5 a polygon is constructed for the winding for p, 2 for sec. The numbers from 1 to 63 numbered the points corresponding to the winding grooves, used in the construction of an auxiliary triangular grid C2, the side of which depicts the vector of the phase zone current in one layer of the groove and taken two units of length (the AZBXCY vector in the center of Fig. 5 winding zones). Over the MDS polygon using

cosine theorem, determine the square of the average radius of the slot points of the polygon R 9726/63; square of the radius of a circle corresponding to the main harmonic GVA and the WG WG coefficient

 0.8629, - Rj f | -0.8629) z

 152,77288, where (9-2 + 12) 3/63

 90/63 — average value of the current of the groove (coils of additional branches of the phases are flowed around by twice the current compared to coils of the branches of stars); differential scattering coefficient characterizing the percentage of higher and lower harmonics in the MDS winding curve, 6d (R | 1) .100

Q C 20

25

ZO MQ

35

45

0

j

five

56

 1.0526%. Similarly, for a coefficient of 0.5, one gets:

Rj 4608/63; Rl (|| -0,8499) 2

 72.620131 and d 0.7198%. Thus, the proposed winding has significantly lower coefficient values of 4 2 GB winding} with 39 slots.

The proposed winding can be applied, for example, on the bark of synchronous machines with an excitation system from a third harmonic magnetic field. It replaces two separate windings of the core of a serial machine: a three-phase main with a polarity of p 2 and a single-phase additional with a polarity of p 6 that is connected through the excitation control unit with valves to the excitation winding of the rotor the reverse field of a single-phase circuit with p 6). The use of such a winding in generators allows to obtain positive effects: to simplify the design and manufacture of the machine, to reduce the consumption of copper and insulation on the core, to improve the shape of the output voltage curve (due to a decrease in the coefficient (), to sew overheating on the core and to increase the operational reliability cars.

Claims (1)

Formula of inventions Combined three-phase-single-phase root winding, for example, for a synchronous machine with a third harmonic excitation system of a 1Ск6й magnetic field, made of twelve coil groups with numbers from 1G to 12G, consisting of concentric coils connected in two parallel three-phase stars and three additional branches, the end of each additional branch is connected to the junction point of the star phases of the same name, the conclusions are made from the zero points of the stars and the beginnings of additional branches, with coils of even groups included in the branches x is opposite to the coils of odd groups, and the numbers of the groups of phases alternate relative; groups of the first phase with intervals of four groups for the phase of the second / hl) g of g cr h h g sr 6G 7g 8g south pg NW 01 n1