Offset MR Angle Sensor Layout for Accurate Out-of-Shaft Sensing
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Solution Overview
Problem
Magneto resistive (MR) angle sensor systems face reduced measurement accuracy in the out-of-shaft (OOS) configuration due to geometrical restrictions, leading to unsuitable applications where high accuracy is required.
Innovation Solution
Positioning the sensitive plane of the MR sensor with an offset to the center of the magnet in the OOS configuration, ensuring equal amplitudes of magnetic field components in both directions, thereby improving the accuracy of rotational angle measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the magnet is arranged at the surrounding surface of the rotating component in an OOS configuration, then geometrical restrictions are satisfied, but measurement accuracy is reduced
Solution Approach 1:
The patent changes the spatial parameter by introducing an offset between the sensitive plane of the MR sensor and the center of the magnet. This offset parameter is specifically designed to equalize the amplitudes of the magnetic field components in the x and y directions, thereby restoring measurement accuracy in the OOS configuration while maintaining adaptability to geometrical restrictions
2Measurement precision
If the magnet is arranged at the end of the shaft in an EOS configuration, then measurement accuracy is maintained, but geometrical restrictions cannot be satisfied
Solution Approach 1:
The patent introduces asymmetry into the OOS configuration by deliberately offsetting the sensitive plane from the magnet center. This asymmetric arrangement compensates for the geometric constraints by creating a specific spatial relationship that equalizes magnetic field components, achieving both geometric adaptability and measurement accuracy
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 high-accuracy rotational angle measurement in the OOS configuration, comparable to the end-of-shaft (EOS) configuration, by equalizing the amplitudes of magnetic field components, thus overcoming the limitations of conventional OOS setups.
Implementation Method 1
Magnetoresistance is the tendency of a material to change the value of its electrical resistance in an externally-applied magnetic field. There are a variety of effects that can be called magnetoresistance, for example AMR, anisotropic magnetoresistance; GMR, giant magnetoresistance; and TMR, tunnel magnetoresistance.
Implementation Method 2
a magnet, which is attached to the rotating component, and a magneto resistive sensor. A sensitive plane of the MR sensor is positioned with an offset to the center of the magnet in an offset direction.
Data Source
AI summary
A magneto-resistive angle sensor system for measuring a rotational angle of a rotating component in an out-of-shaft configuration. The magneto-resistive angle sensor system including a magnet, which is attached to the rotating component. The magneto-resistive angle sensor system further including a magneto resistive sensor. A sensitive plane of the magneto-resistive sensor is positioned with an offset to the center of the magnet in an offset direction.