Magnetic Sensor IC Phase Selection via Twist Angle and Displacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing magnetic field sensors struggle to achieve desired electrical phase relationships between planar and vertical sensing elements when positioned relative to a ring magnet, leading to sensitivity issues and mechanical tolerance problems.
Innovation Solution
A method and apparatus for positioning a multi-channel magnetic field sensor IC package at a non-zero twist angle and displacement relative to the centerline of a ring magnet, using a mesh function to select the offset angle and displacement for achieving specific phase relationships between planar and vertical sensing elements, thereby optimizing the phase relationship and reducing sensitivity to mechanical tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the magnetic field sensor is positioned at zero twist angle and zero displacement relative to the ring magnet centerline, then the mechanical assembly is simplified, but the desired electrical phase relationship between planar and vertical sensing elements cannot be achieved
Solution Approach 1:
The patent applies parameter changes by introducing non-zero twist angle and non-zero displacement as positioning parameters. Specifically, the sensor is positioned at a twist angle of approximately 30 degrees and a displacement of approximately 4mm from the ring magnet centerline, which transforms the magnetic field distribution pattern and achieves the desired 120-degree electrical phase relationship between sensing elements that cannot be obtained with zero positioning parameters
2Manufacturing precision
If the sensor is positioned with non-zero twist angle and displacement to achieve desired phase relationships, then the electrical phase precision is improved, but the sensitivity to mechanical tolerances and assembly variations increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-positioning the sensor at specific twist angle and displacement values that inherently provide the desired phase relationship. The mesh function is used beforehand to determine the optimal positioning parameters, so that during actual operation, the system maintains the desired phase relationship without requiring real-time adjustment or being overly sensitive to small tolerance variations
3Manufacturing precision
If multiple sensing elements are used to achieve desired phase relationships, then the sensing capability and phase control are improved, but the device complexity increases
Solution Approach 1:
The patent applies merging by integrating multiple sensing elements (planar and vertical Hall elements) into a single IC package that processes all signals. The mesh function merges the positioning parameters (twist angle and displacement) into a unified solution that coordinates all sensing elements, reducing the overall system complexity despite having multiple elements
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 approach allows for precise control of electrical phase relationships between sensor outputs, enabling effective sensing applications such as current sensing and rotation detection with reduced sensitivity to mechanical tolerances and assembly variations.
Implementation Method 1
a first channel for a planar magnetic field sensing element
Implementation Method 2
a second channel for a vertical magnetic field sensing element
Data Source
AI summary
Methods and apparatus for positioning a magnetic field sensor IC package having a first channel for a planar magnetic field sensing element and a second channel for vertical magnetic field sensing element in relation to an axis of a ring magnet to provide a desired phase relationship between the first and second channels. In embodiments, positioning the sensor includes an offset angle and a displacement with respect to a centerline of the ring magnet.