Stator coil end encapsulating and fixing method

Abstract

The invention provides a stator coil end encapsulating and fixing method which is characterized by comprising the following steps that: a large conical ring is fixed on the end of a stator coil; the inner side of the large conical ring is sequentially provided with a first resin rope layer, a lower layered bar, a second resin rope layer, arc-shaped pressure plates between layers, a third resin rope layer, an upper layered bar, a fourth resin rope layer and an upper layered arc-shaped pressure plate; and epoxy potting compound is cast between the lower layered bar and the upper layered bar. The method has the advantages that the arc-shaped pressure plates between layers are polypropylene arc-shaped pressure plates, have small proportion and light weight, can reduce the end weight of a generator, and can partially absorb vibration produced by the end when the generator works. The overall encapsulating form of the end not only ensures that the overall performance is excellent but also ensures that the end of the stator winding of a motor is not affected by the outside environment and oil leak in the insulation state. A parting belt is wrapped on the end of the stator coil, thereby ensuring that the bars are safely pulled out from the epoxy resin potting compound when the generator is repaired, and facilitating the repairing of the motor.

Description

technical field [0001] The invention relates to a method for fixing the stator coil end with glue, which is used for fixing the end of the stator coil of a large turbogenerator, so as to ensure that the wire rod bears the strong alternating vibration force during normal operation, and at the same time withstands the sudden short circuit The impact of powerful electromagnetic force belongs to the technical field of generators. Background technique [0002] In the field of large generators, the main insulation of the stator coil is directly related to the operational reliability, life and technical and economic indicators of the generator, and is a core component. As the unit capacity of the generator increases, the stator current also increases. The electromagnetic force that the stator coil receives in the iron core slot is proportional to the square of the current of the wire bar, so that the electromagnetic force in the slot increases sharply. Therefore, the fixing of th...

AI Technical Summary

Problems solved by technology

The main insulation of the stator bar in the slot causes local wear on the iron core, and the binding tape at the end of the stator is worn off, which seriously affects the service life of the motor; especially when the load changes or a short circuit occurs, the electromagnetic force acting on the stator bar Will exceed more than 100 times the rated state

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