Inductive Position Sensor Angular Range Optimization
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Solution Overview
Problem
Existing inductive position sensors face challenges in minimizing angle determination errors while achieving the smallest possible size, as the exciter coil's influence on voltage signals in the receiving system can disrupt angle detection, requiring iterative design steps that increase costs and development time.
Innovation Solution
The position sensor is designed with the receiving system extending over a first angular range and the exciter coil over a second angular range, both as multiples of an unambiguous range, with the second range being greater, to minimize the exciter coil's influence and achieve a compact structural form, where m≥n and preferably m=n+1, optimizing the geometry of the rotor element and conductor loops to enhance signal strength and reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the exciter coil is made as large as possible relative to the receiving system, then the influence of the exciter coil on the voltage signals is minimized, but the overall size of the position sensor increases
Solution Approach 1:
The patent applies parameter changes by defining specific angular range relationships between the receiving system and exciter coil. The receiving system covers an angular range of N1=n×E and the exciter coil covers N2=m×E, where E is the unambiguous range, n≥1, m≥2, and m≥n. This mathematical parameterization transforms the design from iterative trial-and-error to a calculated optimization, minimizing the exciter coil's disruptive influence while maintaining compact dimensions.
2Measurement precision
If iterative design steps are used to optimize the position sensor, then the angle determination accuracy is improved, but development time and costs increase
Solution Approach 1:
The patent implements preliminary action by establishing the angular range relationship (N1=n×E and N2=m×E with m≥n) during the design phase rather than through iterative adjustments. This pre-calculated approach determines the optimal configuration before manufacturing, eliminating time-consuming trial-and-error development cycles while ensuring accurate angle determination.
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 design minimizes angle determination errors and achieves a compact form by ensuring the exciter coil's influence is minimized, reducing development effort and costs, while allowing for precise angle detection across the specified unambiguous range.
Implementation Method 1
a stator element having an exciter coil to which a periodic alternating voltage is applied and having a receiving system, wherein the signal of the exciter coil is inductively coupled into the receiving system
Implementation Method 2
a rotor element which influences the strength of the inductive coupling between the exciter coil and the receiving system according to its angular position relative to the stator element
Data Source
AI summary
An inductive position sensor including a stator element having an exciter coil to which a periodic alternating voltage is applied and having a receiving system, wherein the signal of the exciter coil is inductively coupled into the receiving system. A rotor element influences the strength of the inductive coupling between the exciter coil and the receiving system according to its angular position relative to the stator element. An evaluation circuit determines the angular position of the rotor element relative to the stator element from the voltage signals induced in the receiving system. The position sensor has an unambiguous range E, in which the angular position can be unambiguously determined. The receiving system extends over a first angular range, wherein the first angular range is N1=n*E where n≥1, and the exciter coil extends over a second angular range, wherein the second angular range is N2=m*E where m≥2.