Rotary Inductive Sensor Coil Layout for Offset Error Reduction
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Solution Overview
Problem
Rotary inductive sensors face accuracy issues due to electromagnetic interference and cornering effects in the configuration of their inductive coil circuits, which can lead to offset errors in measurement signals.
Innovation Solution
The configuration of a rotary inductive sensor includes a dual coil circuit with coils of opposite polarity, positioned on a printed circuit board opposite a rotary inductive sensor target, to reduce offset errors by minimizing magnetic field interaction and coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between traces and coils is increased to reduce electromagnetic interference, then measurement accuracy is improved, but device complexity and manufacturing precision requirements increase
Solution Approach 1:
The patent applies differential measurement technique where the harmful electromagnetic interference and cornering effects are converted into a beneficial cancellation mechanism. By measuring both affected coils and computing the difference between their outputs, the common-mode interference is eliminated while the useful signal is preserved, thus improving measurement accuracy without increasing physical spacing or complexity
2Measurement precision
If spaced apart traces or coils are implemented to reduce interference, then measurement accuracy is improved, but coupling factor between components increases
Solution Approach 1:
The differential measurement approach converts the harmful crosstalk and coupling effects into beneficial common-mode signals that are rejected during differential computation. The interference affecting both coils similarly is transformed into a cancelable component, improving accuracy while maintaining compact component spacing
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 configuration effectively reduces offset errors in the receiving coil signal, improving the accuracy of rotary inductive sensors by minimizing electromagnetic interference and cornering effects.
Implementation Method 1
an induced change in an electromagnetic field of the inductive coil circuits is generated in response to a rotational movement of the target and the resulting current and/or voltage signal is output by the sensor
Implementation Method 2
an induced change in an electromagnetic field of the inductive coil circuits is generated in response to a rotational movement of the target
Data Source
AI summary
Systems and methods for a vehicle pedal assembly and an inductive sensor assembly thereof. The inductive sensor assembly includes a rotary inductive sensor target and a printed circuit board (PCB) positioned opposite the rotary inductive sensor target. The inductive sensor assembly includes a first inductive sensor circuit defined on the PCB. The first inductive sensor circuit includes a first coil circuit including a first coil having a first electrical current in a first flow direction and a second electrical coil having a second current in a second flow direction opposite to the first flow direction. The first inductive sensor circuit is configured such that a rotation of the rotary inductive sensor target induces a change in the first electrical current and the second electrical current within the first coil and the second coil.