CS216702B1 - A method of producing winding insulation from insulating mica materials with a curable binder for highly stressed electric machines - Google Patents

Abstract

The essence of the invention is that instead of hot-ironed coils, groove insulation, mica insulation shaped into a trough according to the groove size are inserted into the grooves of the machine yoke, the coil is previously thinly stretched with glass cloth, hot-rubbed with epoxy and hot-cured in a preparation to the required size. An intermediate insert and another coil are inserted on top of this. After bending the mica insulation, groove insulation, inserting the inserts under the groove wedge and after driving the groove wedges in all the machine grooves, the entire wound part of the machine is heated to a temperature at which the binder from the mica insulation materials sticks to the coil, after which it hardens. This simultaneously pre-drys the entire winding and immediately impregnates it.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing coil insulation, in particular rotor coils and coil compensation coils of electrically and mechanically highly stressed rotating electrical machines.

The insulation of the rotor coils and the compensation coils of highly stressed electrical machines is still carried out by ironing mica insulation with a curable binder on a conductor or a compact bundle of wires, ie a coil on ironing machines with hot. In the warm state, the coil is compressed and the insulation is partially shaped and allowed to cool. Then the coils are inserted into the metal jigs - the curing templates and the binder cures at a specified temperature over a period of time. The coils produced in this way are inserted into the yoke grooves, which are insulated by a groove insulation which practically only protects the manufactured coil from mechanical damage. After inserting all coils, the entire winding in the machine is impregnated. The resulting insulation has excellent electrical properties and good heat transfer from the conductor through the insulation to the iron yoke of the machine.

Disadvantages of the described method of manufacture are unhygienic workplaces, a very laborious method of production with a large consumption of mica insulator, requiring expensive curing and measuring devices and aids, expensive ironing machines with a large consumption of electricity.

The aforementioned drawbacks are eliminated by the method of making winding insulation from mica insulating materials with curable binder for highly stressed electrical machines, both thermally and mechanically, in particular electric rotating machines according to the invention, which is based on the fact that mica insulation, made of mica materials with curable binder and trough shaped, inserts coil and intermediate lining and after closing the groove insulation in the groove by bending, inserting the insulation under the wedge and securing the groove wedge on all grooves of the yoke of the electric machine in which a binder of mica insulation materials adheres to the coil and then cures.

The object of the invention is apparent from the description and the accompanying drawings, in which Fig. 1 denotes an inserted groove insulation 1 shaped in a trough in the groove of the yoke of an electric machine. FIG. 2 shows the winding insulation already made of mica insulating materials with curable binder. Into the groove of the yoke of the electric machine is inserted a groove insulation 1, a mica insulation 6 and a made-up coil 2, which forms a compact bundle of conductors, e.g. pre-thinned with glass fiber, epoxy coated and heat cured in the fixture to the required size. Then, the intermediate liner χ and the other coil 2 are inserted. After the mica insulation 6 has been bent and the groove insulation 1 has been bent, the insulating insert is inserted under the groove wedge (6) and the groove wedge (6) is struck.

Then the entire wound part of the machine is heated to a temperature at which the binder of mica insulation materials adheres to the coil and cures. At the same time the entire winding is pre-dried and immediately impregnated.

Intermediate liner forms intermediate position insulation and is of mica insulator. It can be attenuated, as it is over-dimensioned in systems used up to now.

216 702

By utilizing the invention, the winding workplace hygiene is improved, the winding production process is simplified, and labor and savings on mica insulator consumption are saved, costly curing and measuring devices and utilities, and costly ironing machines with high electricity consumption.

Claims (1)

SUBJECT OF THE INVENTION Method for producing winding insulation of mica insulating materials with curable binder for thermally and mechanically highly stressed electrical machines, in particular rotating electrical machines, characterized in that, after insertion of groove insulation (1), mica insulation (4) of mica materials with curable binder and trough-shaped, insert spool (2) and intermediate liner (3) and after closing the groove insulation (1), mica insulation (4) in the groove by bending, inserting the insulating insert (5) under the groove wedge ( 6) and with a slot wedge (6) on all grooves of the yoke of the electric machine, the entire wound part of the machine is heated to a temperature at which the binder of mica insulation materials adheres to the coil (2) and then cures.