Current Sensor Asymmetric Support for Wire Diameter Variations
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Solution Overview
Problem
Current sensors with magnetic sensing elements face significant output fluctuations when their installation position is displaced relative to a wire, particularly due to differences in wire diameters, leading to inaccurate current measurements.
Innovation Solution
A current sensor design featuring a casing with a pair of arms and a support system that includes magneto-electric transducers arranged on a virtual ellipse, where the support is disposed obliquely relative to the major or minor axis of the ellipse, and a band is used to fasten the wire, minimizing sensitivity changes caused by wire diameter variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wire is pressed against the inner surface of the circular end of the slit for positioning and fixation, then the current sensor can be securely fixed to the wire, but the centers of wires having different diameters differ in position from one another when fixed, causing output fluctuation
Solution Approach 1:
The patent introduces an asymmetric support structure with an oblique surface that is not symmetric with respect to the wire center. This asymmetric design intentionally creates a fixed offset position for the wire center, transforming the variable positioning problem into a controlled, consistent position that eliminates output fluctuations while maintaining secure fixation for wires of different diameters.
Solution Approach 2:
The patent changes the geometric parameter of the support structure by introducing an oblique surface at a specific angle. This parameter change transforms the wire positioning from a variable center position (causing output fluctuation) to a fixed offset position (eliminating output fluctuation), while the oblique surface maintains secure contact for wires of different diameters.
2Adaptability or versatility
If the installation position of the current sensor is displaced relative to the wire, then the sensor can accommodate different wire positions, but the magnetic flux density at the position of the sensor significantly changes, causing output fluctuation
Solution Approach 1:
The patent replaces the traditional circular slit positioning mechanism with a mechanical support structure featuring an oblique surface. This mechanical support system actively compensates for installation position variations by providing a fixed offset position, thereby maintaining stable magnetic flux density and output while accommodating different wire positions and diameters.
3Device complexity
If a circular end slit is used for wire positioning, then the structure is simple, but it cannot compensate for wire diameter variations, leading to different wire center positions and output fluctuation
Solution Approach 1:
The patent modifies the simple circular slit structure by introducing an asymmetric oblique support surface. This minimal addition of asymmetry to the otherwise simple structure enables compensation for wire diameter variations while maintaining overall structural simplicity, eliminating output fluctuation without requiring a completely complex positioning system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration stabilizes the wire's center position, reducing sensitivity fluctuations and enhancing the accuracy of current measurements across various wire diameters, thereby improving measurement precision.
Implementation Method 1
a current sensor that allows magnetic sensor elements to detect a change in magnetic field caused by target current
Implementation Method 2
a band wound around a circumferential surface of the wire fastened between the arms, part of the band being caught by the support
Data Source
AI summary
A current sensor includes a casing including a pair of arms and coupling part, multiple magneto-electric transducers arranged on the circumference of a virtual ellipse whose major axis or minor axis extends between the arms, a support disposed obliquely relative to the major axis or the minor axis of the virtual ellipse within an angle formed by the major axis and the minor axis so as to be close to one of the arms when viewed from the center of a wire disposed and fastened between the arms, and a band wound around a circumferential surface of the wire fastened between the arms, part of the band being caught by the support, the wire being fastened by the band such that the central axis or center of the wire is held close to the support.