A stator iron core structure of a hydrogenerator and a molding method thereof

Abstract

The invention discloses a stator iron core structure of a hydrogenerator and a molding method thereof. The stator iron core structure comprises a plurality of silicon steel sheets; according to the arrangement position of the silicon steel sheets on a stator base, the silicon steel sheets are divided into a middle iron core assembly and end iron core assemblies at the two axial ends; each siliconsteel sheet of the end iron core assembly is bonded and assembled into an integral annular structure according to the arrangement order, the silicon steel sheets of the middle iron core assembly are stacked and arranged between the end iron core assemblies of the integral annular structure at both ends in the arrangement order, and the end core assemblies at both ends respectively bear the axial locking force of the stator core pressing mechanism to the stator core structure in the axial direction. The present invention not only does not obviously increase the technical difficulty of processing and assembling the stator iron core structure, but also can meet the technical requirements of the service condition, and can effectively solve the technical problem that the axial locking force ofthe stator iron core structure on the stator frame is liable to be destroyed, which is favorable for the long-term safe and stable operation of the hydrogenerator.

Description

technical field [0001] The invention relates to a hydraulic generator, in particular to a new stator core structure of a hydraulic generator and a forming method of the stator core structure. Background technique [0002] The stator of the hydro-generator is the static part of the hydro-generator. It is mainly composed of the stator frame and the iron core and windings assembled on the stator frame. And the necessary electromagnetic part of the current path. [0003] The stator core structure of a hydroelectric generator is composed of a number of silicon steel sheets stacked on the stator frame according to the set arrangement sequence, especially the stator core structure of a large-scale hydroelectric generator. , each layer of silicon steel sheets is composed of several fan-shaped silicon steel sheets in a circumferential butt joint manner according to the set arrangement sequence. The stator core structure stacked and formed on the stator frame is fixed by the axial l...

AI Technical Summary

Problems solved by technology

Although this kind of stator core structure meets the technical requirements of processing, assembly and use conditions, it is inconsistent due to the inconsistency of the bearing force of the tensioning screws distributed in the circumferential direction, especially the silicon steel sheets of large-scale hydro-generators are fan-shaped and non-uniform. The full-circle forming structure, the split stacking structure between adjacent silicon steel sheets, and the fan-shaped non-full-circle forming structure of the finger plate that transmits the axial locking force make the axial locking force of the stator core structure increase with the service time. Due to the vibration of electromagnetic, mechanical and other forces, the axial locking force borne by the end of the stator core structure is differentiated in the circumferential direction. This difference will bring the stator core structure in the stator frame. Technical problems such as looseness, broken teeth, coil wear, coil blasting, etc., will even cause serious accidents such as stator core burnout, which is not conducive to the long-term, safe and stable operation of the hydro-generator set

[0004] If the silicon steel sheet at the end of the stator core structure of the hydroelectric generator and the finger pressure plates at both ends of the stator frame are directly formed in a round overall structure in the circumferential direction, the axial locking force will be enhanced in the circumferential direction. The balanced application of the stator core structure ensures the firm and stable long-term assembly quality of the stator core structure on the stator base, so as to improve the long-term safe and stable operation of the hydro-generator set; however, this will increase the stator iron of the hydro-generator. The processing and assembly technology of the core structure is difficult, and may even fail to meet the technical requirements of the working conditions

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