Glue injection and injection molding method for inductors

Abstract

The invention discloses a glue injection and injection molding method for inductors, which includes inner glue injection and outer injection molding. In inner glue injection, at least a through hole of one inductor is filled with a circular glue layer the same as the through hole in shape, two ends of the circular glue extend out of two end faces of the inductor, the outer peripheral face of the extension end is serrated, and accordingly a semi-finished inductor is obtained. In outer injection molding, subjecting the outer periphery and the through hole of the semi-finished inductor element are subjected to injection molding. A plastic layer at least covers an extension end of the circular glue, so that the plastic layer is meshed with the serrated outer periphery of the extension end. The inductors produced by the method are high in temperature and humidity resistance, fine in insulativity, stable in inductance and low in cost.

Description

Technical field: [0001] The invention relates to a method for manufacturing an inductance element, such as a method for manufacturing a current sensor and a voltage sensor, in particular to a method for injecting glue and molding an inductance element. Background technique: [0002] In the field of motor power applications, inductive components are widely used. Inductance components need to pass the test of high voltage insulation and high temperature and high humidity environment such as instantaneous lightning strike. In general high-pressure injection molding methods, due to the poor fluidity of plastic raw materials, extreme pressure (200bar to 1300bar) is required to force the injection. The molten plastic with extremely high pressure can easily pierce the tape, and the extruded coil will shift and the magnetic core will deform, resulting in inductance. Disadvantages such as low and poor precision, low yield rate, increased manufacturing costs, especially after long-te...

AI Technical Summary

Problems solved by technology

In general high-pressure injection molding methods, due to the poor fluidity of plastic raw materials, extreme pressure (200bar to 1300bar) is required to force the injection. The molten plastic with extremely high pressure can easily pierce the tape, and the extruded coil will shift and the magnetic core will deform, resulting in inductance. Disadvantages such as low and poor precision, low yield rate, increased manufacturing costs, especially after long-term use, latent sequelae are gradually exposed, which is a hidden worry in the industry, and due to the long cooling time of plastic raw materials, production is time-consuming, Shortcomings such as low output and high manufacturing costs restrict the development of the industry

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