SU961049A1 - Electric machine stator winding rod - Google Patents

Description

The invention relates to electrical engineering, more specifically to the construction of a stator winding rod of an electrical machine with a baseless core.

The stator winding core of an electric machine with a non-core core is known, which contains round isolated from each other elementary transposed conductors and cooling tubes placed between conductors IJ.

However, this design is characterized by insufficient cooling efficiency of the core conductors due to the limited contact surface of the cooling tubes with conductive transposed bundles of elementary conductors. .

A stator winding core of an electric machine with a unlabeled core is known, which contains current-carrying strands enclosed in a cabinet insulation and insulated from each other, having a central cooling channel for passing refrigerant, and insulated circle. New elementary connected conductors. In this rod, the cooling fluid passes through the central KaeaJty, formed by strands of elementary conductors of the ring sector. The sealing of the cooling channel of each is carried out using an outer tube made of highly resistive metal or glass tape. The space between the strands is filled with resin for

10 creating a solid conductor 2.

However, in the indicated rods, due to the limited contact surface of the cooling tubes with conductive transposed beams of elementary conductors, there is an insufficient cooling efficiency of the core conductors. In addition, these rods are not technological enough, since

20, when crimping the rod to ensure its solidity, ch150schichnaya flattening of the cooling tubes placed between the bundles of conductors and closing

25 internal channels of tubes serving as a coolant passage.

Closest to the offer is the winding bar of the electric machine sector with a safe

30 core containing groups of round insulated transposed conductors with a cooling tube for the passage of refrigerant. Groups of conductors, having a central cooling tube and enclosed in a body insulation, form the strands of which the stator winding rod consists. The cooling effect is achieved due to the cooling insulated tube, on which several concentric rows of individual elemental conductors are wound, transported in adjacent rows by wound in different directions of the NW}. outer surface cooling. tubes with transposed conductors wound on them.

The purpose of the invention is to increase the cooling efficiency while reducing electromagnetic losses.

This goal is achieved by storing the stator winding of an electric machine with a gas-free core containing groups of round insulated transported conductors with a cooling tube for cooling, the agent last transported between Himself, and then transposed together with the cooling tube over the cross section of the rod.

FIG. 1 shows a braided stitch (transitions of conductors from a column to a column of the transposed rod length), top view; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a section b-B in FIG. one; in fig. 4 shows a section B-B in FIG. one.

The stator winding core of an AC electrical machine contains two columns isolated from each other and from the stator housing (not shown), groups or bundles of elementary transposed conductors 1 and cooling tubes 2, for example, groups of elementary conductors and cooling tubes in one column 3. and group elementary conductors and cooling tubes in j pyroM column 4. Each group or bundle of elementary insulated conductors arranged in columns one above the other (Fig. 2) are transposed between each other (Fig. 3). For example, (Fig. 2), the groups of elementary conductors 5 and b, according to the transposition, move to another column (Fig. 3). At the same time, each cooling tube in the column between the groups of elementary conductors (Fig. 2) is then transposed together with the groups of conductors (Fig. 4). For example (Fig. 3), the cooling tube 7 is transposed, with groups of conductors 5 and 6 and comes in a different column (Fig. 4).

The proposed rod design provides increased cooling efficiency and reduces the level of electromagnetic losses by 20-30% in an electric machine with a baseless core, which significantly improves the technical characteristics of the entire electric machine. These advantages are ensured by the fact that in the rod each group of individual elementary insulated conductors is transposed among themselves, which is then transposed together with the cooling tubes over the cross section of the rod. An increase in the cooling efficiency of the proposed rod in comparison with the known one is provided by direct contacting the outer surface of the cooling tubes with transposed groups of elementary insulated conductors.

In addition, the reduction of additional losses in the stator winding from circulation currents is achieved due to the fact that groups or bundles of elementary insulated conductors are transposed between each other and then jointly transposed with cooling tubes over the cross section of the rod.

The proposed solution can be used in a 300 MW cryogenic turbogenerator.

Claims (3)

1. US patent number 3743867, 310-52, 1973. kl 2. The patent of England No. 1360387, Н 2 А, 1974. kl 3. USSR author's certificate for application No. 2711981 / 24-07, by H 02 K 3/24, 1979. 5 l. Fig.G Aa 2 6-6 5 b 7 one 2 HUUUUU UU Ъ {UCH |