Vacuum pressure impregnation insulation process for stator strip coils of large high-voltage shielded motors

Abstract

The invention relates to a vacuum pressure impregnation insulation process for stator strip coils of a large-scale high-voltage shielded motor. The present invention divides the coil into 4 parts according to Fig. 1, namely coil conductor T, coil end A, coil straight line position B, coil conductor end A and coil conductor straight line B geometric tangent point C, according to the technology of the present invention, first Complete the insulation wrapping of the straight part B of the coil. In the present invention, no cracks will occur when the corners are stressed during wire embedding. After the wire embedding is completed, the end of the coil can be impregnated, thus ensuring the insulation of the entire winding coil after vacuum pressure impregnation and curing of the whole machine. The performance is the same as that of the overall vacuum pressure impregnation curing of the winding coil. The invention solves the problem that the insulation of the blank coil is not impregnated when the long iron core has no ventilation groove, and the thickness of the coil insulation is thicker when the molded coil insulation process is adopted, and the molded coil has been cured before use, and the coil is straight when embedding the wire. The problem of cracking when the insulation at the corner of the end is stressed.

Description

Technical field: [0001] The invention relates to a vacuum pressure impregnation insulation process for stator strip coils of a large-scale high-voltage shielded motor. Background technique: [0002] The large main pump shielded motor used in the primary circuit of the nuclear island of a nuclear power plant is used in the nuclear island. Due to the limited volume of the nuclear island, the volume of the motor must be reduced as much as possible while ensuring reliability. The motor is vertical, and the winding iron core is slender. In order to minimize its volume, the coil is designed as a strip coil, so that the diameter of the end of the winding is reduced by twice the diameter of the corner of the nose (about 100mm) compared with the conventional coil coil. , There is no gap between the hypotenuses of the adjacent coils of the winding, which is different from the requirement for a certain gap between the hypotenuses of the conventional winding coils. This requires a cert...

AI Technical Summary

Problems solved by technology

According to the conventional insulation technology, the coil can be manufactured into a molded coil, but the insulation of the molded coil is cured, and the deformation of the last few coils is large when the coil is inserted into the wire without gaps on the hypotenuse of the coil. At this time, the insulation at the corner will crack. , and the insulation thickness of the molded coil is thicker than that of the blank coil, and thicker insulation will increase the diameter of the iron core, so the insulation technology of the molded coil does not meet the requirements of this project

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