Flexible Rogowski Coil Sensor Alignment Mechanism
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Solution Overview
Problem
Traditional Rogowski coil current sensors face challenges in achieving accurate measurements due to non-uniformities in the coil loop closure region, leading to increased costs and the need for individual calibration, especially in portable applications where sensors must be re-tuned frequently.
Innovation Solution
A Rogowski coil sensor design featuring a flexible carrier with a combined cap, guide clip, and locking mechanism that aligns and locks the free and terminated ends of the coil into a closed loop configuration, ensuring a uniform turn density and constant spacing, thereby reducing the need for compensatory electronics and individual calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If compensatory electronics are used to reduce the impact of non-uniformities in the coil loop closure region, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces electronic compensation mechanisms with a mechanical alignment system. The guide clip structure with positioning features (such as ribs, grooves, or tapered surfaces) mechanically ensures uniform turn density and constant spacing in the coil loop closure region, eliminating the need for complex compensatory electronics while maintaining measurement accuracy.
2Measurement precision
If compensatory electronics and individual calibration are used to achieve accurate readings, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The mechanical alignment system provides inherent uniformity in the coil loop closure region through its geometric design, eliminating the need for individual calibration of each sensor. The guide clip structure ensures consistent turn density and spacing across all manufactured units, significantly reducing manufacturing costs while maintaining high measurement accuracy.
3Ease of operation
If the sensor is made flexible for portable applications, then ease of operation is improved, but manufacturing precision deteriorates due to frequent re-tuning requirements
Solution Approach 1:
The patent incorporates a reusable mechanical alignment system (guide clip with positioning features) that maintains precise geometric relationships even when the sensor is flexed and reconfigured. This mechanical solution ensures consistent turn density and uniform spacing across multiple deployments, eliminating the need for re-tuning after each installation while preserving sensor flexibility for portable applications.
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
The solution provides a low-cost, flexible, and portable Rogowski coil sensor that achieves high measurement accuracy with a reliable alignment mechanism, minimizing the impact of non-uniformities and eliminating the need for frequent recalibration in various conductor applications.
Implementation Method 1
Variations in the magnetic field surrounded by the turns of the coil 112—i.e., the magnetic field of the primary conductor 100—induce a voltage between the terminals 120, 122 of the measurement head
Data Source
AI summary
In various embodiments, a low-cost Rogowski coil sensor including a coil wound around a flexible carrier is provided with a reliable parallel-entry closure mechanism.