SU1554080A1 - Device for moulding and baking coils of frame insulation of electric machines - Google Patents

Abstract

The invention relates to electrical engineering, in particular to the technology of manufacturing electrical coils of field windings of a closed ring shape, and can be used in electrical engineering. The aim of the invention is to improve the quality of the coil by eliminating the deformation of the insulation. For this, the element for crimping the coil according to the inner diameter and the ends is made in the form of a set of sectors 2, which have a flange and an inner conical surface 3, and an insert 6 with an outer conical surface 7 in contact with the surface of 3 sectors. The insert is made of a material with a high coefficient of linear expansion. The coil 5 is placed on the sectors and a split ring 11 is placed on top of it. A band of 12 steel wires having a low coefficient of thermal expansion is applied to the ring. Using the studs 9 and the nuts 10 of the wedge mandrel formed by the sectors 2 and the insert 6, unclenched, presses the body insulation to the coil. When baking, the body insulation is pressed in all directions. 3 Il.

Description

Coil 5 is installed on a special groove in one of the sectors 2 (not shown). An insert 6 with an outer conical surface 7, made of a material with a high temperature coefficient of linear expansion (for example, brass) with respect to the material being pressed, is placed in a mandrel formed by sectors 2. A plate 8 is mounted on the protruding flange of the ring 6, connected to the plate 1 by pins 9 with nuts 10. On the outer surface of the coil 5 there is an oppression split ring 11 made of a steel strip 1.5 mm thick. A coil 12 is applied to the coil over the ring II with a tension of 60-100 kg of steel wire having a low linear expansion temperature coefficient compared to the material of the coil 5. The bushing 12 is fixed to the coil 5. At the junction of sectors 2, coil 5 side 13 has spring steel pads 13 with a thickness of 0.2 mm to prevent snacks and imprints on the body insulation from sector 2 joints. At the junction of the ring 11 there is also a gasket 13 from spring steel to avoid snacks on the insulation (not shown).

With the help of studs 9 and nuts 10 wedge mandrel, formed sector

2 and an insert 6, unclenched, pressing a case isolation to the coil.

The coil in the device is loaded into the oven and, baked according to the baking mode of the cabinet insulation, the cabinet insulation of the electric coil is simultaneously pressed along the inner contour with a mandrel due to the insert 6 having a high temperature coefficient of linear expansion, and along the outer contour with a band of 12 steel wire having a lower temperature coefficient of linear expansion than the material of the coil 5. From the ends of the coil 5, the body insulation is compressed due to

Q 5

0

.

0

lowering the height of the coil by the length of the sectors 2 and insert 6.

When using this device, leaks and wrinkles in the body insulation are eliminated, and the body insulation of the coil is prevented from buckling. The quality of the insulation and the reliability of the electric coils in severe and especially difficult working conditions are sharply increased.

When using this device, special high-temperature autoclaves and other special equipment are not required, and an electric furnace with an operating temperature of 300 ° C is sufficient.

Claims (1)

Invention Formula A device for crimping and baking the cabinet insulation of electric machine coils, comprising a split ring for crimping the coil in outer diameter, an element for crimping the coil in inner diameter and ends, and an overlay of elastic material, such as spring steel, for closing the joints, characterized in in order to improve the quality of the coil by eliminating defects in the deformations of the insulation, it is equipped with two plates interconnected by studs, a bandage made of a material with a low temperature coefficient linear expansion, the element for crimping the coil on the inner diameter and ends is made as a set of sectors forming a cylinder and having a conical inner surface and flanges, and a cylindrical insert with a flange and a conical surface in contact with the conical surface of the sectors made of a material with temperature coefficient of linear expansion, for example brass, with a bandage mounted on the split ring, sectors with their flanges are placed on one of the plates, and the other plate is placed on the insert flange. V ten de de D 5; s // / D / O / / 7/7 5719 2 7 / / /  / Ј 1 Fig.Z