SU1564706A1 - Three-phase two-speed two-layer winding - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to reduce losses from higher spatial harmonics. The winding is made with the ratio of the numbers of pairs of poles P ₁ : P ₂ = 3: 2 and contains 44N coil groups of K = Z / 44N coils each, where Z is the number of coils of windings, N is an integer number, Nb is a group of integers from 1 to N. The coil groups are connected in two three-phase stars. The findings are made from the ends of the phases of the stars. The distribution of the coil groups over the phases of stars is given. 2 Il.

Description

The invention relates to electrical engineering, in particular to structural elements of the windings, and can be used in electrical engineering for the production of marine propulsion motors.

The aim of the invention is to reduce losses from higher spatial harmonics.

Fig. 1 shows the scheme of the proposed winding at P 3: 2 for the case of Fig. 2 — MDS curves along the winding sweep with two pole numbers equal to 6 and 4.

In Fig. 1, numbers from 1 to 44 show the numbers of coil groups, each of which may consist of one coil, and with a larger number Z, of several coils (even numbers in the drawing are omitted). For other values of n, for example, equal to 2 , the number of pairs of poles will be P4 6, Pt 4, n 1; 2, i.e.

n is equal to the number of numbers in group n or the last number in this group.

When P: P2 3: 2, for example n 1, (

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consists of a single coil. With n 1, Z 88, K 2, i.e. each group consists of two coils. With P.,: P2 6: 4 n 2j with Z 88, K 1, i.e., 0 each coil group consists of one coil, but n 1; 2, and the first phase of the first star is composed of coil groups numbered 1, 2, 2, 4, -38, -39, -40, -41 (here n) and 45, 46, 47, 48, -82, - 83, -84, -85 (here p 2).

To create a larger number of poles in an electric machine, both stars are connected to sources (source) of voltage so that the phase directions of the currents in them, calculated from the input terminals A, B t C 4, AV, B2, C, coincide with the SP

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yut. In the case of winding for the rotor, the phase directions of the induced currents coincide. In this case, the currents in the conductors constituting the sides of the coils create a rotating magnetic field with the number of poles 2P as a result of the joint action.

To create a smaller number of 2P poles in an electric machine, both stars are connected to voltage sources (source) in such a way that the phase directions of the currents in the second star are opposite to the directions that occurred with the number of poles 2P,.

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Both of these schemes can be carried out with the power supply of both half windings from one source as well as from two voltage sources, and in the case of using a winding for the rotor of a two-speed motor, when feeding the winding with currents induced from a two-speed stator winding.

In the VAT curves shown (Fig. 2), the horizontal row of the table shows the numbers of coil groups (consisting of each coil under the considered Z 44), the numbers of the vertical row show the winding phase numbers, the arrows show the direction of the MDS of each side of the coil at a certain moment time Step lines show the MDS at the location of each side of the coil with two numbers of poles: 1 - with 2P 6, 2 - with 2Pg 4. Curve 2 is constructed when the second star coils changed in reverse directions of MDS, indicated by curved lines.

The use of a winding performed with a number of grooves that is a multiple of 44, for example, on a rotor of an asynchronous-synchronous motor with an internal cascade in combination with typical most common stator with a number of grooves that are multiples of 18 or 24, reduces

Claims (1)

Invention Formula A three-phase, two-speed two-layer winding with a change in the direction of the current in part of the coils, with a ratio of 3: 2 pole pairs, characterized in that, in order to reduce losses from higher spatial harmonics, it contains 44p coil groups of K Z / 44n coils each with pitch, connected in two three-phase stars with their ends with conclusions from the beginnings, phases, in the first phase of the first star the coil groups with numbers 1 + 44 (n -1), 2 + 44 (n -1), 3 + 44 x x ( n -1), 4 + 44 (n1-21), - 38-44 (n -1), -39-44 (n -1) „-40-44 (n -1), -41-44 (n -1), in the first phase of the second star included reel g groups with numbers 16 + 44 (). 17 + 44 (n -1) 18 + 44 (), 19 + 44 (n -1), -9-44 (n -1), -10-44 (n -1), -26-44 (n - 1), in the second phase of the first star, the coil groups numbered 6 + 44 х х (п -1), 7 + 44 (n-l), 8 + 44 (n-l), 35 + 44 (n-l) are included , 36 + 44 (n-l), 37 + 44 (n-l), the second phase of the fluorine star includes coil groups with numbers. 20 + 44 (n -1), 21 + 44 (n -1) , 22 + 44 (p -1), 23 + 44- (p -P, 24 + 44 (p -1), 25 + 44 (p -1), -14-44 (p -1), -28- 44 x x (n -1), - 30-44 (n -1), in the third phase of the first star are included the coil groups with numbers 15 + 44 (n -1), 42 + 44x x (n - l), 43 + 44 (n -1), 44 + 44 (n -1), -5-44 (n-l), -31-44 (n -1), - 33-44x x (n -1), -34- 44 (n -t), the third phase of the second star includes the coil groups with numbers 11 + 44 (n -1), 12 + 44 (n -1), 13 + 44 (n -1), 27 + 44x х (n -1), (27 +44 (n -1), 28 + 44 (n -1), 29 + 44 (n -1), where the minus sign in front of the number of the coil group means its opposite inclusion relative to the coil group, denoted by F4 P4 com plus, n g- -, Z is the number of ka; winding carcasses, p - a group of integers from 1 to p. H F H F I Well Well but BW sg cha "M