Coaxial Magnetic Sensor Coil Layout for Reliable Field Detection
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Solution Overview
Problem
Existing magnetic sensor modules face challenges in efficiently detecting magnetic fields due to the design limitations of Hall elements and their encapsulating structures, which affect sensitivity and reliability.
Innovation Solution
A magnetic sensor chip design featuring a substrate with a detection coil and a test coil, where the coils are arranged coaxially with an insulating member in between, allowing for improved magnetic field detection and induced voltage generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Hall element and encapsulating resin structure is used, then magnetic field detection function is achieved, but sensitivity and reliability are insufficient
Solution Approach 1:
The patent replaces the traditional Hall element (mechanical/electronic component) with a coil-based electromagnetic induction system. The detection coil generates magnetic flux that interacts with the target magnetic field, inducing voltage signals that are detected by the pickup coil. This substitution of the detection mechanism improves both sensitivity and reliability by utilizing electromagnetic induction principles rather than Hall effect limitations.
Solution Approach 2:
The patent optimizes several parameters including the number of turns in the detection coil, the coil winding density, the core material permeability, and the gap dimensions. By adjusting these parameters, the magnetic flux density and induced voltage are maximized, thereby improving detection sensitivity and reliability without requiring a complete system redesign.
2Productivity
If conventional coil arrangement is used, then simple structure is maintained, but magnetic field detection efficiency is reduced
Solution Approach 1:
The patent implements a nested coil configuration where the pickup coil is positioned inside or concentric with the detection coil. This nested arrangement allows the pickup coil to efficiently capture the magnetic flux generated by the detection coil while maintaining a compact overall structure. The nesting principle improves detection efficiency by maximizing flux linkage without proportionally increasing device complexity.
Solution Approach 2:
The patent transitions from a planar coil arrangement to a three-dimensional coaxial configuration. The detection coil and pickup coil are arranged along the same axial direction with the detection coil having more turns and larger diameter. This dimensional optimization improves magnetic field detection efficiency by creating a stronger and more uniform magnetic flux distribution in the detection region.
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
Enhances the sensitivity and reliability of magnetic field detection by optimizing the coil configuration and insulation, thereby improving the performance of magnetic sensor modules.
Implementation Method 1
A magnetic sensor chip includes a detection coil 30, a detection terminal 50 used to detect an induced voltage generated by the detection coil 30, a test coil 40 disposed at a position spaced apart from the detection coil 30, and a test terminal 60 used to supply a test current to the test coil 40. The test coil 40 is arranged such that an induced voltage is generated in the detection coil 30 when a test current flows through the test coil 40.
Data Source
AI summary
A magnetic sensor chip includes a detection coil arranged with the X-direction as its axial direction, a detection terminal used to detect an induced voltage generated by the detection coil, a test coil disposed at a position spaced apart from the detection coil, and a test terminal used to supply a test current to the test coil. The test coil is disposed at a position where an induced voltage is generated in the detection coil when the test current flows through the test coil.