Electric Current Sensor Gap Optimization for Leakage Flux Resistance
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Solution Overview
Problem
Existing electric power devices face challenges in effectively utilizing the gap length of magnetic cores for detection elements due to the influence of ambient magnetic fields, leading to variations in sensitivity and linearity of current sensors.
Innovation Solution
The design includes a reactor with a winding part and two electric power lines extending perpendicular to its axial direction, featuring first and second electric current sensors with annular cores and gaps, where the distance between the detection element and the winding part's central position varies, and the gap lengths are adjusted based on the influence of leakage magnetic flux to optimize detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the gap length of electric current sensors is increased to reduce the influence of leakage magnetic flux, then the resistance to ambient magnetic field improves, but the detection sensitivity decreases
Solution Approach 1:
The patent applies local quality by setting different gap lengths for different electric current sensors based on their specific positions relative to the reactor. Sensors closer to the reactor (greater leakage magnetic flux influence) have smaller gap lengths to maintain sensitivity, while sensors farther away have larger gap lengths to reduce ambient field interference. This localized optimization resolves the contradiction between resistance to harmful magnetic factors and detection precision.
2Ease of manufacture
If uniform gap lengths are used for all electric current sensors, then manufacturing simplicity is maintained, but detection accuracy varies due to different positions relative to the reactor
Solution Approach 1:
The patent implements local quality by determining gap lengths individually for each sensor based on its position relative to the reactor and the maximum current it detects. This approach optimizes detection accuracy for each specific location while maintaining reasonable manufacturing simplicity through a systematic determination method rather than completely custom fabrication for each sensor.
3Measurement precision
If the gap length is decreased to improve detection sensitivity, then measurement precision improves, but the influence of leakage magnetic flux increases
Solution Approach 1:
The patent applies parameter changes by adjusting the gap length parameter of each electric current sensor according to its specific operating conditions, including position relative to the reactor and maximum current value. This systematic parameter optimization allows each sensor to achieve the best balance between detection sensitivity and resistance to leakage magnetic flux based on its local environment.
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 enhances the resistance of current sensors to leakage magnetic flux, improves sensitivity and linearity, and allows for effective use of gap lengths in magnetic cores, especially when the maximum current values differ between sensors.
Implementation Method 1
a first electric current sensor including a first detection element and an annular first core with a first gap for providing the first detection element, and being configured to detect first electric current flowing through the first electric power line
Implementation Method 2
a first detection element and an annular first core with a first gap for providing the first detection element, and being configured to detect first electric current
Data Source
AI summary
In an electric power device and a method of producing the electric power device, in an axial direction of a reactor, a distance between a detection element of a second electric current sensor and a central position of a winding part is shorter than a distance between a detection element of a first electric current sensor and a central position of a winding part. Further, a gap length of a core of the second electric current sensor is smaller than a gap length of a core of the first electric current sensor.