Iron core structure of distribution transformer special for electric vehicle

Abstract

The invention discloses an iron core structure of a distribution transformer special for an electric vehicle. A plurality of stacked iron core unit chips are arranged inside an iron core, are similar in shape and different in cross section area and are arranged in the axial direction of the iron core and wrapped with an insulation layer, the cross section of the iron core is of a long-circular structure, the insulation layer is also of a long-circular structure, and the insulation layer comprises arc segments and linear segments tangent to the arc segments. According to the iron core structure, a common iron core with a circular section is designed into the iron core with the long-circular section, and the material consumption of the iron core and the production cost are reduced on the basis that the effective section of the iron core is ensured. Linear air channels and stepped arc air channels are arranged among the iron core unit chips, so that the effective heat dissipation area of the iron core is increased, and the heat dissipation effect is enhanced; thus, the temperature rise of the iron core is relieved, the over-excitation running capability of the transformer is improved, and the service life of the transformer is prolonged.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a special distribution transformer iron core structure for electric vehicles. Background technique [0002] The iron core and winding of the traditional oil-immersed transformer are circular structures, for example, the application number is 2005200988031, and the invention name is high-frequency high-voltage transformer iron core. The weight of the iron core has a great relationship with the center distance of the yoke of the iron core. The larger the center distance of the iron yoke, the greater the weight of the iron core and the greater the loss. The cost of the iron core accounts for a relatively high proportion of the cost of the entire transformer. Therefore, in order to reduce the volume of the transformer and reduce the amount of silicon steel sheets without affecting the performance of the iron core, an oblong iron core structure is generally adopted. The applicat...

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Problems solved by technology

However, due to the large stack thickness of this oblong iron core structure, the heat dissipation in the thickness direction is slow, resulting in high temperature of the transformer and shortening the life of the transformer.

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