A fiber sandwich transformer core and its stacking method

Abstract

The invention provides a fiber interlayer transformer iron core and a stacking method thereof. The method includes the steps of putting an insulating piece on a main clamping piece and a clamping iron plate, determining the installation positions of a core column of iron core stacking layers, inserting a positioning pin in a core penetrating hole in a stacking mode at the installation position at the minimum stage, completing stacking of all stages from bottom to top, and adding a fiber interlayer between every two adjacent stages; detaching the positioning pin after completing stacking, and putting the insulating piece; inserting a fastening screw in the core penetrating hole, assembling the main clamping piece through a yoke penetrating screw and an epoxy resin lashing band, and obtaining the fiber interlayer transformer iron core. The abrasion to a silicon steel sheet insulating coating is reduced; meanwhile, the distribution of pressure stress generated by iron core stacking can be improved, the damping performance of an iron core under miniature vibration is improved, and the problems of iron core bending vibration and radiation noise caused by magnetostriction of a silicon steel sheet can be effectively solved; meanwhile, due to the reasonable distribution of the fiber interlayers, the insulating performance between the interlayers can be improved, and the loss between every two adjacent iron core layer stages is reduced.

Description

technical field [0001] The invention belongs to the field of electrical equipment, and in particular relates to a fiber sandwich iron core and a stacking method thereof. Background technique [0002] The iron core is the main magnetic circuit part of the transformer. In order to reduce the eddy current loss caused by the variable magnetic flux in the iron core, it is usually made of hot-rolled or cold-rolled silicon steel with a high silicon content, a surface coated with insulating paint, and a thickness of 0.27-0.35mm. It is an electromagnetic component of a power transformer. The iron core and the coil on it form a complete electromagnetic induction system, which can go deep into the center of the load. [0003] However, under the working magnetization state, the silicon steel sheet undergoes magnetostriction (elongation parallel to the magnetization direction and contraction perpendicular to the magnetization direction), which causes the vibration of the stacked iron co...

AI Technical Summary

Problems solved by technology

In addition, due to the uneven distribution of magnetic flux density in the transformer laminated core, local flux distortion and temperature changes will cause the laminated core to be subjected to a random and non-uniform local pressure, which will affect the electromagnetic vibration noise of the overall core

When the clamping force of the iron core is not large enough, the flatness of the silicon steel sheet or the self-weight factor will cause the iron core to bend and deform, resulting in the intensification of the bending vibration of the iron core and the increase of radiation noise

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