Current Sensor Bus Bar Recesses Reduce Electromagnetic Induction
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Solution Overview
Problem
Current sensors face challenges in reducing electromagnetic induction between adjacent bus bars, which affects the accuracy of current detection.
Innovation Solution
The design includes bus bars with recesses and detecting elements arranged in a specific configuration to increase the distance between adjacent detectors, using symmetric recess shapes and shield plates to minimize electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between adjacent bus bars is reduced to decrease sensor size, then the overall size of the current sensor is reduced, but electromagnetic induction between adjacent bus bars increases affecting detection accuracy
Solution Approach 1:
The patent introduces recesses in the bus bars as intermediary structural features that modify the electromagnetic field distribution between adjacent bus bars. These recesses act as mediators that reduce electromagnetic induction while allowing the bus bars to remain closely spaced, thus maintaining compact sensor size without sacrificing detection accuracy
Solution Approach 2:
The patent applies local quality by creating recesses only in specific locations on the bus bars - specifically in portions that overlap with detecting elements in the thickness direction. This localized modification affects only the critical regions where electromagnetic induction occurs, leaving other portions of the bus bars intact for current conduction
2Measurement precision
If the distance between adjacent detectors is increased to reduce electromagnetic induction, then electromagnetic interference is minimized, but the overall size of the current sensor increases
Solution Approach 1:
The recesses in the bus bars serve as intermediary structures that actively reduce electromagnetic induction between adjacent detectors. This allows detectors to be positioned closer together without experiencing excessive electromagnetic interference, as the recesses modify the field distribution to protect the detection regions
Solution Approach 2:
The patent utilizes the thickness direction (vertical dimension) to create recesses that extend downward from the bus bar surfaces. This three-dimensional approach allows electromagnetic induction to be reduced in the horizontal plane without increasing the horizontal distance between detectors, effectively using the vertical dimension to solve a horizontal spacing problem
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 effectively reduces electromagnetic induction, maintaining detection accuracy without increasing the overall size of the current sensor.
Implementation Method 1
three detectors configured to detect the electric current are disposed for the three bus bars
Data Source
AI summary
A current sensor includes three bus bars, each of which has recesses. The third bus bar is between the first and second bus bars. The recesses of the first and second bus bars are symmetrical about a virtual line that passes through the center of the third bus bar. The third bus bar has two recesses that are symmetrical about the same virtual line.