RU2335077C2 - ELECTRIC MACHINE THREE-PHASE DOUBLE-LAYER WINDING AT 2p=16·c POLES IN z=3(8·b+5) ·c SLOTS - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: winding incorporates 2p=16·c poles made up of 3p·c coil groups with the numbers from 1"Г" to 24"Г"·c in z=3(8·b+5)·c=63·c slots, or in z=87·c, or in z=111·c slots at b = 2, 3, 4 and with the number of the slots per a pole and phase q=z/3p=21/8, or q=29/8, or q=37/8. In compliance with the first version, the winding is made in z=63·c slots with q=21/8 and the coil group 3 3 2 3 3 2 3 2 in the series repeated 3·c times. Note, that in the first group 3"Г"...8"Г", the three-coil windings feature the coil pitch over the slots y_si=6, 4, 2 and are made with (1-x)w_c, (1+x)w_c, (1-x)w_c turns while the two-coil groups feature the coil pitch over the slots y'_si=5, 3 are furnished with w_c, (1+x)w_c turns at x=0.56. In compliance with the second version, the winding is laid in z=87·c slots with q = 29/8 and the coil group 4 4 3 4 4 3 4 3 in the series repeated 3·c times. Note that in the first group 1"Г"...8"Г", the four-coil windings feature the coil pitch over the slots y_si=8, 6, 4, 2 and are made with (1-x)w_c, (1+x)w_c, w_c, (1-x)w_c turns while the three-coil windings feature the coil pitch over the slots y'_si=7, 5, 3 are made with w_c, (1+x)w_c, w_c turns at x = 0.58. In compliance with the third version, the winding is made in z=111·c slots with q = 37/8 and the coil group 5 5 4 5 5 4 5 4 in the series repeated 3·c times. Note that in the first group 1"Г"...8"Г", the five-coil windings feature the coil pitch over the slots y_si=11, 9, 7, 5, 3 and are made with (1-x)w_c, w_c, (1+x)w_c, w_c, (1-x)w_c turns, while the four-coil groups feature the coil pitch y'_si = 10, 8, 6, 4 and are made with w_c, w_c, (1+x)w_c, w_c turns at x = 0.57. The aforesaid distributions of coils with unequal number of turns are repeated in every following group, where c=1, 2, 3...; 2w_c is a number of slots filled completely with the winding.

EFFECT: reducing winding differential dissipation factor.

4 cl, 10 dwg

Description

The invention relates to three-phase windings of electrical AC machines, can be used on a stator of asynchronous and synchronous machines, a phase rotor of asynchronous motors (HELL).

Known loop two-layer symmetrical m = 3-phase, 2p-pole windings, performed in z grooves from m'p coil groups with coils of equal steps or concentric with an average pitch of grooves y _to ≈τ _p = z / 2p, the number of grooves per pole and phase q = z / m'p, where m '= 2m = 6 or m' = m = 3 is the number of phase zones per pair of poles [Voldek A.I. Electric cars. L .: Energy, 1978, S. 392-394]. Fractional windings with q = z / m'p = N / d and d≥2 not multiple of m = 3 create harmonic MDS in the series ν = km '/ d ± 1 [ibid, p. 450], including the lower ν <1 with increasing differential scattering σ _d% , where ± k is an integer giving the order of harmonic ν> 0 for forward (+) or counter (-) rotation.

The invention aims to reduce the differential scattering m '= 3-zone winding at 2p = 16 · with poles in z = 3 (8 · b + 5) · with grooves at b = 2, 3, 4, made of 3p · from the coil groups with q = z / 3p = N / 8 (N = 21, 29, 37) according to well-known groupings of coils in groups [Livshits-Garik M. Windings of AC machines. / Per. from English L .: SEI, 1959, p.225], repeated 3 · s times.

The solution of this problem is achieved by the fact that for m = 3-phase two-layer electric machine winding at 2p = 16 · with poles

1) at z = 63 · with a groove q = 21/8 and a group of 33233232: in the first group of 1G ... 8G, the three-coil groups have grooves in grooves at _pi = 6, 4, 2 s (1-x) w _k , (1 + x) w _to , (1-x) w _to turns, and double-coil to y ' _pi = 5, 3 s w _to , (1 + x) w _to turns at x = 0.56,

2) in z = 87 · c grooves with q = 29/8 and grouping 44344343: in the first grouping 1G ... 8G the four-coil groups have grooves in grooves for _pi = 8, 6, 4, 2 s (1-x) w _to , (1 + x) w _to , w _to , (1-x) w _to turns, and three-coil - to ' _Пi = 7, 5, 3 with w _to , (1 + x) w _to , w _to turns with a value of x = 0.58;

3) in z = 111 · with grooves with q = 37/8 and group 55455454: in the first group 1G ... 8G of the group, the five-coil ones have coil steps along the grooves for _pi = 11, 9, 7, 5, 3 s (1- x) w _to , w _to , (1 + x) w _to , w _to , (1-x) w _to turns and four- _coil - at ' _Пi = 10, 8, 6, 4 with w _to , w _to , (1 + x) w _to , w _to turns at a value of x = 0.57. Such distributions of unequal coils are repeated in each subsequent grouping, where c = 1, 2, 3 ...; 2w _to - the number of turns of the grooves, completely filled with a winding.

Figure 1 shows a scan of the groove layers of the proposed winding with c = 1 and 2p = 16, z = 63 with groups 1G ... 24G (numbered above) for z '= z / 3 = 21 grooves with 1 numbers 1 ... 21 from below, by alternating phase zones in the sequence ABC and X-YZ in the upper and lower layer, where the blackened grooves are incomplete when equivalent z _e = 3 (N-2x) completely filled grooves; figure 2 shows a diagram of the shifts of the axes of the groups of zones And relative to the axis of symmetry 7G and 19G; Figures 3 and 4 along a triangular grid with its side per unit length are the polygons of the MDS winding of figure 1 at x = 0 of figure 3, x = 0.5 of figure 4. Figure 5, 6, 7 shows the same as figure 1, 3, 4, but with z = 87 for z '= z /' 3 = 29. In Figs. 8, 9, 10 - the same as in Figs. 1, 3, 4, but with z = 111 for z '= z / 3 = 37. Such m ′ = 3-zone windings according to FIGS. 1, 5, 8 are connected when the groups of zones A, B, C in phases I, II, III are connected in series, and the phases can be mated in Y or Δ; with, for example, c = 2, the windings have 2p = 32 poles with z = 126, 174, 222 grooves.

For the winding of Fig. 1, equal-turn (x = 0) winding coefficient K _ob for shortening coefficients K _y = sin (90 °) for _k / τ _p ) for y _k = 4, τ _p = z / 2p = 63/16, distribution To _p = sin (60 °) / Nsin60 ° / N is equal to K _about = K _at K _p = 0,82708; when x ≠ 0 is added to the K value _about neravnovitkovosti coils defined by _claim 2, when α = 360 ° / z = 40 ° / 7: -x (0,680173-0,99969-0,715867) (1 + 2cosα _n + 2cos2α _n) = - x1,9621 to 7D + 1D + 13D + 4D + 10D, x0,930874 (1 + 2cosα _n) = x2,78337 to 19g + 22g + 16G when _yi = 0.680173 K (y _pi = 6), 0.99969 (for _pi = 4), 0.715867 (for _pi = 2), 0.930874 (y ' _pi = 3), K _about N = 17.3687 and ∑x = + 0.8213 then

Of the polygons of the MDS of Figs. 3 and 4 (in the center, the unit vectors of the currents of the phase zones are shown) according to a triangular grid and relations [Popov V.I. Determination and optimization of the parameters of three-phase windings according to their polygons MDS // Electricity, 1997, No. 9, p.53-55]

the differential scattering coefficient σ _d% is determined that characterizes the quality of the winding according to the harmonic composition of the MDS, where R ² _d is the square of the average radius j = ... N = 21 groove points, R _о and К _ob - for harmonic v = 1:

According to (1) - (3) from the condition d (σ _d ) / d (x) = 0, the optimal X _opt = 0.56 is calculated, corresponding to σ _{d% min} : K _rev = 0.8968, R ² _d = 101, 4608/21, R _o = 59.64 0.8968 / 8π and σ _{d% min} = 6.68 for z _e = 3 (N-2x) = 3 · 19.88 · 3 = 59.64, and at x = 0-σ _d% = 16.33, i.e. the value of σ _{d% of the} winding of FIG. 1 decreases by 16.33 / 6.68 = 2.44 times due to the elimination of harmonic MDS ν = 1/8; subject to changes in K _about and z _{e the} effectiveness of such a winding is equal to K _eff = (0.8968 / 0.8271) (16.33 / 6.68) z _e / z = 2.51.

Similarly: in Fig.5 ... 7: K _about = (23.7970 + x1.4906) / (29-2x), R ² _d = (254-8x-34x ² ), x _opt = 0.58 and σ _{d% min} = 3.78, and at x = 0-σ _d% = 8.55 and K _eff = 2.35; in Fig.8 ... 10: K _rev = (30.5998 + x1.7620) / (37-2x), R ² _d = (520 + 2x + 51x ² ), x _opt = 0.57, σ _{d % min} = 2.12, and at x = 0-σ _d% = 5.34 and K _eff = 2.61. Compared to m '= 6-zone windings at 2p = 16, q = z / 6p = N / 16 (N = 1, 29, 37), m' = 3-zone windings have lower σ _d% and are much simpler to manufacture due to half the number (3p) of groups.

The application of the proposed winding on the stator HELL allows you to reduce additional losses in steel and moments from harmonic fields, improve vibration-acoustic characteristics, increase efficiency and cosφ ₁ , and in synchronous generators it improves the shape of the output voltage curve.

Claims (3)

1. Three-phase two-layer electromachine winding at 2p = 16 · with poles in z = 3 (8 · b + 5) · with grooves, made of 3p · s coil groups with numbers from 1G to 24G · s, characterized in that at b = 2, z = 63 · s, q = z / 3p = 21/8 and the grouping of coils in a row 3 3 2 3 3 2 3 2 repeated 3 · c times, in the first grouping of 1G ... 8G three-coil groups have steps the coils in the grooves at _pi = 6, 4, 2 s (1-x) w _to , (1 + x) w _to , (1-x) w _{to the} turns, and double-coil - at ' _pi = 5, 3 with w _to , (1-x) w _to turns at a value of x = 0.56, and such a distribution of unequal coils is repeated in each subsequent grouping, where c = 1, 2, 3 ...; 2w _to - the number of turns of the grooves, completely filled with a winding. 2. Three-phase two-layer electromachine winding at 2p = 16 · with poles in z = 3 (8 · b + 5) · with grooves, made of 3p · from coil groups with numbers from 1G to 24G · s, characterized in that at b = 3, z = 87 · s, q = z / 3p = 29/8 and the grouping of coils in a row 4 4 3 4 4 3 4 3, repeated 3 · c times, in the first grouping of 1G ... 8G four-coil groups have steps the coils in the grooves at _pi = 8, 6, 4, 2 s (1-x) w _to , (1 + x) w _to , w _to , (1-x) w _{to the} turns, and the three-coil ones - at ' _pi = 7 , 5, 3 with w _k , (1 + x) w _k , w _k turns at a value of x = 0.58, and such a distribution of unequal coils is repeated in each subsequent grouping, where c = 1, 2, 3 ...; 2w _to - the number of turns of the grooves, completely filled with a winding. 3. Three-phase two-layer electric machine winding at 2p = 16 · with poles in z = 3 (8 · b + 5) · with grooves, made of 3p · s coil groups with numbers from 1G to 24G · s, characterized in that at b = 4, z = 111 · s, q = z / 3p = 37/8, the grouping of coils in a row 5 5 4 5 5 4 5 4, repeated 3 · s times, in the first grouping of 1G ... 8G five-coil groups have steps the coils in the grooves at _pi = 11, 9, 7, 5, 3 · s (1-x) w _k , w _k , (1 + x) w _k , w _k , (1-x) w _k turns, and four-coil - y ' _pi = 10, 8, 6, 4 · s w _k , w _k , (1 + x) w _k , w _k turns at a value of x = 0.57 and this distribution of unequal coils is repeated in each subsequent grouping where c = 1, 2, 3 ...; 2w _to - the number of turns completely filled with winding grooves.

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