Magnetic Angle Sensor Error Cancellation
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Solution Overview
Problem
Existing magnetic angle sensor systems are vulnerable to assembly tolerances and background magnetic field disturbances, which affect the accuracy of rotational position determination.
Innovation Solution
A magnetic angle sensor arrangement using two magnetic angle sensors with diametrically opposed magnetic field components, where the magnetic fields applied to each sensor are anti-parallel or differ by a significant angle, allowing for the combination of output signals to cancel out errors caused by background fields and improve robustness against assembly inaccuracies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single magnetic angle sensor is used, then the device complexity is low, but the measurement precision is reduced due to vulnerability to assembly tolerances and background magnetic field disturbances
Solution Approach 1:
The system divides the measurement function into two separate magnetic angle sensors instead of using one sensor, allowing each sensor to contribute to the final measurement. This segmentation enables error cancellation through signal combination while maintaining functional simplicity
Solution Approach 2:
The patent converts the harmful effect of background magnetic fields and assembly tolerances into a beneficial error cancellation mechanism. By arranging sensors to experience opposite diametrical field components and combining their signals, the system transforms disturbances that would normally degrade precision into canceling errors that improve measurement accuracy
2Reliability
If two magnetic angle sensors with anti-parallel magnetic fields are used, then the reliability against disturbance fields is improved, but the device complexity increases
Solution Approach 1:
The system introduces asymmetry in the magnetic field arrangement by using anti-parallel or significantly angled diametrical field components between the two sensors. This asymmetric configuration ensures that background fields and assembly errors affect each sensor differently, enabling error cancellation when signals are combined
Solution Approach 2:
The two-magnetic angle sensor arrangement serves multiple functions simultaneously: it provides redundant measurement capability, enables error cancellation through signal combination, and maintains compatibility with standard magnetic field geometries. This multi-functionality achieves improved reliability without requiring fundamentally new sensor types
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 system effectively cancels out angle errors due to disturbance fields and is robust against assembly tolerances, maintaining high accuracy in determining rotational positions despite varying background magnetic conditions.
Implementation Method 1
the at least one permanent magnet is arranged to apply magnetic fields at the two magnetic angle sensors with different directions of diametrical magnetic field components
Data Source
AI summary
A magnetic angle sensor device is suggested comprising a shaft that is arranged rotatably around a rotation axis, at least one permanent magnet, a stator and two magnetic angle sensors, which are fixed to the stator, wherein the shaft is arranged rotatably against the stator, wherein the at least one permanent magnet is connected to the shaft, and wherein the at least one permanent magnet is arranged to apply magnetic fields at the two magnetic angle sensors with different directions of diametrical magnetic field components.