SU752627A1 - Electric-machine stator winding bar - Google Patents

Description

(54) ELECTRIC STATOR WINDING STEM The invention relates to electrical engineering, more specifically to the design of the stator winding rod of a large, electrical AC machine, for example a turbo generator. The stator winding rod of an alternating current electric machine is known, in which the elementary conductors are transposed in the slot part by 360 and in each of the two frontal parts of the rod, the conductance is shifted by 180 ° 1 in a constant step. The disadvantage of this rod design is that it does not both compensate for the circulation losses in the frontal part of the rod from solid flows. The stator winding rod of an electric machine is also known, containing two rows of isolated elementary conductors, electrically connected at the ends and divided along the length of the slot part into three transposition sections, and at the extreme sections the transposition of the conductors is 180 degrees. In this rod, the conductors in the groove part are transposed by 540 °, the transposition sections are unequal in length, and at each section of the MACHINE the transposition is performed by 180 °, with the outer sections twice as long as the middle section and the transposition step in the extreme areas is 1 (540), and in the middle section health b. Thus, the transposition step in the extreme areas is half the transposition step of 360 ° with the same length of conductors and the same number of them 2. The disadvantage of this design lies in the fact that the transposition step is small at the extreme sections of the rod, therefore such a rod is difficult to manufacture, not technologically advanced and, moreover, not reliable enough, since the manufacture of such a rod with a small transposition step does not exclude the possibility of conductors at their sharp bends when transposed. The purpose of the invention is to increase reliability and manufacturability by increasing the pitch of the transposition. This goal is achieved by the fact that in the stator winding rod of an electric machine, containing two rows of insulated elementary conductors electrically connected at the ends and divided along the groove part into three sections of transposition, in the extreme sections the transfer of conductors is performed through 180 ° full transfer of conductors in the PA8OVOY part is made on 450, the transposition sections are made equal in length, with the middle section of the rod divided into three parts and on the middle part with a length equal to 1/6 of the slot length Asti rod transposition conductors 90 formed on and adjacent parts, the length equal to 1/12 of the length of the groove part, without transposition vsholneny conductors.

FIG. 1 schematically shows a stator winding rod, side view; in fig. 2 is a view A of FIG. 1 (rod end); in fig. 3 view B in FIG. 1 (rod end) 5 in FIG. 4 - stator winding rod, top view; on. FIG. 5 - the right row of elementary conductors of the rod; in fig. b - type C in FIG. 5 (the end of the right row of conductors at the beginning of the rod); FIG. 7, view G in FIG. 5 (the end of the right row of conductors at the end of the rod); in fig. 8 is a right side view of a series of elementary conductors of the rod; in fig. 9 - the left row of elementary conductors of the rod; in fig. 10 is a view of D in FIG. 9 (end of the left row of conductors at the beginning of the rod); in fig. 11 is a view E of FIG. 9 (the end, of a left-hand row of conductors at the end of the rod); FIG. 12 - the left row of elementary conductors of the rod, top view.

The stator winding rod of the electric machine contains two rows, left 1 and right 2, isolated between themselves elementary conductors 3, electrically connected at the ends of the rod. The rod is divided along the length of the slot part 1 of the transposition section 1,, 1, 1J, and at the extreme sections C and i, the conductance of the conductors is 180 °, i.e., the elementary conductor 3 of the terminals in these sections sequentially z. different positions in the groove height, i.e. half a turn In all the drawings, for the sake of consistency, the conductors in the groove are successively shown, one conductor is shown as dark. The transposition sections i 2 of the rod are made equal in length to the slot part 1. The middle section 1 is divided into three parts and

in the middle part 1d, with a length equal to 1/6 of the length of the 1st groove part, the conductors are transposed 90 °, and the adjacent parts Ig and) g long are avnoy 1/12 the length of the groove part 1, made without the transposition of the conductors.

The transposition step on all transposed areas is uniform and% 4tf). That is, 4/3 times more than a small step with a known

0 transposition of conductors in a groove at 540.

The described rod structure of the stator winding of an electric machine is more technological since it has

5 greater transposition step, and more

reliable, because when transposing conductors with a large pitch, there is less likelihood of self-insulation damage at the bends of the drivers. Therefore, this transposition can be applied to rods with a relatively small length and a large number of conductors.

Claims (2)

1..Patent of France No. 1.269541, 50 cells. H 02 k, 1960. 2.Dombrovsky V.V., Khutoretsky G.M. Basics of designing AC electric machines. LO, Energie, 1974, p. 122-123. "Yl and" 9