Magnetic induction current sensor for electric vehicle controller

Abstract

The invention relates to a magnetic induction current sensor for an electric vehicle controller, wherein a closed magnetic circuit is formed by a magnetic sensor, at least two magnetic ring sections are comprised, the magnetic sensor is arranged in a magnetic gap between the two magnetic ring sections, and an external lead wire passes through the closed magnetic circuit formed by the magnetic ring sections and the magnetic sensor. The invention provides the magnetic induction current sensor, which has the advantages of lower material cost, lower manufacturing requirements, better seismic resistance, better linearity and higher precision, and is more convenient to install and easier to regulate.

Description

Technical field: [0001] The invention relates to a current sensor, in particular to a magnetic induction current sensor used in an electric vehicle controller. Background technique: [0002] Currently, electric vehicles on the market use magnetic induction current sensors to measure large currents in wires, such as figure 1 Shown: The current of the measured wire passes through the magnetic ring with an opening, and the linear Hall chip is placed in the magnetic gap of the magnetic ring. The Hall chip requires that the magnetic induction generated by the magnetic ring varies with the measured current passing through the magnetic ring. Increase linearly, which requires the magnetic permeability of the magnetic ring to be very low, about ten times that of the air magnetic permeability, so the magnetic ring generally adopts a specially customized iron powder core material with a very low magnetic permeability. The characteristics of the magnetic ring material are very brittle,...

AI Technical Summary

Problems solved by technology

The characteristics of the magnetic ring material are very brittle, and the magnetic permeability is very low; after the magnetic gap of the magnetic ring is molded and customized, the size is fixed; the shock resistance is poor, and it is easy to be damaged during transportation and assembly

If an ordinary iron powder core or ferrite material with high magnetic permeability is used, a large magnetic gap needs to be opened, so that the linearity of the current sensor will decrease due to the edge effect of the magnetic flux, which will have a negative impact on the accuracy of current detection. greater impact

[0003] So far, there is no magnetic induction current sensor with lower material cost, lower production requirements, good shock resistance, convenient installation, easy adjustment, better linearity and higher precision in the market.

Images