Inductive Angle Sensor Clearance Compensation Circuit
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Solution Overview
Problem
Inductive angle sensors face inaccuracies in determining rotation angles due to variations in spatial clearance between the rotor and stator, which are difficult to measure and correct, leading to inconsistent signal strengths and reduced accuracy.
Innovation Solution
An inductive angle sensor design that includes a circuit to derive an induction strength signal and generate a clearance signal, allowing for the calculation of a calibrated rotation angle by accounting for spatial clearance, thereby improving accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the spatial clearance between rotor and stator is reduced to improve measurement precision, then the accuracy of rotation angle determination is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies preliminary action by measuring the spatial clearance between rotor and stator before the actual angle measurement process. The control unit obtains clearance information and uses it to compensate for measurement errors, ensuring high precision without requiring extremely tight mechanical tolerances during assembly.
Solution Approach 2:
The patent changes the parameter of spatial clearance from a fixed mechanical constraint to a variable parameter that is measured and compensated electronically. By obtaining clearance information and using it to correct measurement values, the system adapts to varying clearance conditions rather than requiring a single optimal fixed value.
2Ease of manufacture
If the spatial clearance between rotor and stator is fixed by construction technology, then the ease of manufacture is improved, but the measurement precision deteriorates due to clearance variations
Solution Approach 1:
The patent implements feedback by measuring the actual spatial clearance and using this information to compensate for measurement errors. The control unit receives clearance information and adjusts the measurement values accordingly, creating a closed-loop system that maintains precision despite variations in mechanical assembly.
Solution Approach 2:
The system performs self-calibration by automatically measuring its own spatial clearance and using this information to correct its measurements. The control unit obtains clearance information and independently calculates compensation values without requiring external calibration procedures.
3Measurement precision
If the number of components in the element is increased to improve measurement precision, then the accuracy is improved, but the ease of manufacture and cost increase
Solution Approach 1:
The patent introduces an intermediary parameter (spatial clearance information) that mediates between the mechanical structure and the measurement process. Rather than adding more sensors or components, the system uses clearance data as an intermediary to correct measurement errors, achieving improved precision through information processing rather than hardware multiplication.
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 solution enhances the precision of rotation angle determination by compensating for spatial clearance variations, resulting in more accurate and reliable angle measurements compared to conventional sensors.
Implementation Method 1
The excitation oscillating circuit can be energized with an alternating current, in order to induce an induction current in the target arrangement
Implementation Method 2
The target arrangement is, in turn, designed to generate a magnetic field in reaction to this induction current
Implementation Method 3
which magnetic field in turn generates induction signals in the pickup coil arrangement
Data Source
AI summary
An inductive angle sensor is provided with a stator with an excitation oscillating circuit and a pickup coil arrangement and also with a rotor which is arranged rotatably with respect to the stator and comprises an inductive target arrangement. The excitation oscillating circuit can be energizable with an alternating current, in order to induce an induction current in the target arrangement, and the target arrangement can be designed to generate a magnetic field in reaction to the induction current, which magnetic field in turn generates induction signals in the pickup coil arrangement. The angle sensor further comprises a circuit that is designed to derive an induction strength signal representing the signal strength of the induction signals from the induction signals and to ascertain the spatial clearance between the rotor and the stator on the basis of the induction strength signal, and to generate a corresponding clearance signal.