Hall Sensor Non-Orthogonality Compensation System
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Solution Overview
Problem
Inaccurate position detection due to non-orthogonality between hall effect devices in position sensing systems, leading to errors in magnetic field angle calculation.
Innovation Solution
A position sensing system comprising a sensing unit with first and second sensors, an exciting unit to apply an excitation current, a trim unit to compensate non-orthogonality by trimming hall voltage signals, and a signal processing unit to generate position information, utilizing a control unit to manage current direction and spinning schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If one pair or two pairs of vertical hall effect devices are placed in perpendicular with each other for position sensing, then the position detection function is achieved, but fabrication errors cause the devices to be non-orthogonal, leading to inaccurate detection
Solution Approach 1:
The patent applies preliminary calibration to determine compensation coefficients before actual position sensing operations. The system pre-characterizes the non-orthogonality errors of each sensor pair and stores compensation coefficients that will be used during operation to correct the measurement errors, thus resolving the contradiction between manufacturing imprecision and measurement precision
Solution Approach 2:
The patent changes the parameters of the sensing system by introducing compensation coefficients that modify the raw sensor outputs. By applying these coefficients to correct the non-orthogonality effects, the system transforms the inaccurate measurements into accurate position information, effectively resolving the contradiction between manufacturing variability and measurement accuracy
2Adaptability or versatility
If hall effect devices are used for position sensing, then position detection is enabled, but non-orthogonality between devices causes errors in magnetic field angle calculation
Solution Approach 1:
The patent implements a feedback mechanism where the system uses predetermined compensation coefficients to correct the output signals from non-orthogonal sensors. The compensation process feeds back corrected values that account for the geometric errors, thereby maintaining measurement precision while preserving the versatility of the position sensing capability
Solution Approach 2:
The patent explicitly addresses the asymmetric error introduced by non-orthogonal sensor placement. By determining separate compensation coefficients for each sensor pair based on their specific angular deviations, the system handles the asymmetric manufacturing errors individually, resolving the contradiction between maintaining sensing versatility and achieving accurate angle calculation
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
Significantly improves the accuracy of position sensing by compensating for non-orthogonality between sensors, leading to more precise magnetic field angle calculations.
Implementation Method 1
Hall effect devices are used in various applications. One of the applications is in the area of position sensor.
Data Source
AI summary
A position sensing system has a trim unit to trim hall voltages generated by a first sensor and a second sensor in response to an excitation current, to compensate a non-orthogonality of the first sensor and the second sensor.