Hall Sensor Assembly for 3D Vector Measurement
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Solution Overview
Problem
Current Hall sensors face challenges in accurately measuring all three components of a magnetic field vector to an accuracy better than 1% due to limitations in measuring magnetic fields in a single point in space and time.
Innovation Solution
A Hall sensor assembly comprising multiple Hall sensors, each on a non-conducting, non-magnetic support part, forming groups to cover the three Cartesian directions, with active areas concentrated in a shared miniature volume of less than 200 μm×200 μm×200 μm, allowing for precise measurement of the magnetic field vector by averaging the output values from adjacent sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If Hall sensors are disposed in a larger volume to cover three Cartesian directions, then the measurement coverage is improved, but the measurement precision deteriorates due to averaging errors in non-linear magnetic fields
Solution Approach 1:
The patent implements nesting by placing multiple Hall sensor active areas within a nested configuration where smaller sensor elements are positioned within or adjacent to each other in a hierarchical arrangement. This allows the sensors to cover a three-dimensional volume while maintaining a compact overall footprint, resolving the contradiction between measurement coverage and precision by enabling dense packing of sensors in a nested spatial configuration
Solution Approach 2:
The patent transitions from two-dimensional sensor arrays to a three-dimensional configuration by utilizing vertical stacking and multi-level positioning of Hall sensors. The support parts are designed to hold sensors at different heights and orientations, enabling coverage of all three Cartesian directions (X, Y, Z) while concentrating the active measurement volume. This dimensional expansion allows comprehensive spatial coverage without increasing the planar footprint, thereby maintaining measurement precision in non-linear fields
2Measurement precision
If the Hall sensor active volume is reduced to improve measurement precision, then the accuracy in non-linear fields is improved, but the measurement coverage is reduced
Solution Approach 1:
The patent divides the measurement task into multiple segments by using several individual Hall sensors, each with a small active area, rather than relying on a single large sensor. Each sensor segment measures the magnetic field at its specific location, and the results are combined through averaging. This segmentation allows the system to achieve high precision in non-linear fields while collectively covering a larger three-dimensional volume through the distributed arrangement of multiple sensor segments
Solution Approach 2:
The patent merges the output signals from multiple individual Hall sensors to achieve a combined measurement that represents the full magnetic field vector. By combining the data from sensors positioned at different locations and orientations within the compact volume, the system achieves both comprehensive coverage and high precision through signal integration and averaging, resolving the contradiction between volume and precision
3Adaptability or versatility
If multiple Hall sensors are assembled to cover three Cartesian directions, then the ability to measure the full magnetic field vector is improved, but the device complexity increases
Solution Approach 1:
The patent implements universality by designing a modular support part structure that can hold Hall sensors oriented in different directions (X, Y, Z axes) using the same basic support component design. The support parts are engineered to be multi-functional, accommodating various sensor orientations and configurations without requiring entirely different structural solutions for each axis. This universal design approach reduces device complexity while maintaining the capability to measure all three components of the magnetic field vector
Solution Approach 2:
The patent applies preliminary action by pre-configuring the support parts with integrated mounting features, alignment structures, and positioning elements during the manufacturing stage. The support parts are designed and prepared in advance with built-in capabilities to hold and orient sensors correctly, eliminating the need for complex assembly procedures or additional alignment steps during final assembly. This preliminary preparation of support structures simplifies the overall device complexity while enabling versatile three-axis measurement capability
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 miniaturization of the Hall sensor active volume significantly improves accuracy, reducing errors in measurements of non-linear magnetic fields, achieving an accuracy of better than 10−3 and enabling instantaneous measurement of the full magnetic field vector in a single point.
Implementation Method 1
Hall sensors are known as sensors to measure the strength of a magnetic field by measuring a voltage. Different from inductive measurements, a Hall sensor can also sense DC magnetic fields since the voltage output of a Hall sensor under current is proportional to the current and the strength of the magnetic field.
Data Source
AI summary
An assembly of Hall sensors provides the following: the three averaged values for the magnetic field components are assigned to the same point in space, at the center of the Hall sensor assembly. This allows for the instantaneous measurement of the full field vector. With the appropriate electrical connections of the Hall elements from opposing surfaces of each pair, undesired planar Hall effect is practically cancelled out.