a current sensor

Abstract

The invention provides a current sensor, belonging to the technical field of sensors, comprising: a housing with a built-in cavity, wherein a first positioning part is provided on the cavity bottom of the cavity; an iron core is nested with the first positioning part The iron core is fitted with an air gap, wherein an exposed part is provided on one side of the air gap on the iron core, and a covering part is formed between the iron core and the shell on the side opposite to the exposed part. . The current sensor provided by the present invention can better complete the positioning and fixing of the iron core and the shell before injection molding. In addition, the iron core and the shell in the present invention are integrally injection molded, which reduces the number of injection molding and Avoid the disadvantages brought by the glue filling process and reduce the production cost of the product.

Description

technical field [0001] The invention belongs to the technical field of sensors and relates to a current sensor. Background technique [0002] The principle of the open-loop direct current sensor is to place the sensitive device in the air gap of the annular iron core to detect the change of the magnetic field to realize the detection of the current. With the continuous development of electronic technology, higher requirements are put forward for current sensors, and miniaturization and integration are the future development direction. [0003] Chinese patent (202010853719.5) discloses a manufacturing method of a multi-channel current sensor for new energy vehicles, in which the iron core is subjected to electrophoresis treatment and is firstly coated with injection molding, and then the casing is subjected to secondary integral injection molding. In addition, for Eliminate the influence of the thimble hole of the iron core positioning during the thermoplastic molding proces...

AI Technical Summary

Problems solved by technology

[0009] First, the air gap size of the iron core needs to be guaranteed by the adhesive, which puts forward high requirements for the performance of the adhesive, the location of the adhesive application and the application process, and the air gap size of the iron core is easily affected by the ambient temperature. Influence, and then affect the measurement accuracy;

[0010] Second, there needs to be a filling channel between the iron core and the shell for glue filling, so there is a large gap between the iron core and the shell, which makes it difficult for the sensor to be miniaturized and lightweight;

[0011] Third, the glue pouring process is complicated and the curing time is long, which is not conducive to the automatic assembly line of the product, and at the same time prolongs the production cycle and increases the production cost. In addition, poor glue curing can easily cause problems such as moisture absorption and stress, which will affect the accuracy of the product.

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