Inductive Sensor Receive Coil Tilt Compensation
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Solution Overview
Problem
Existing inductive sensor devices are complex and costly due to the need for multiple receive coils with specific configurations to eliminate tilting errors, which complicates the determination of relative positions between a sensor unit and a scale.
Innovation Solution
An inductive sensor device design featuring a single transmit coil and multiple receive coils with varying loop areas in end sections compared to the middle section, allowing for compensation of misalignments such as tilting through adjustable loop area contributions to the receive signal, thereby reducing or eliminating signal offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple receive coils with specific configurations are used to eliminate tilting errors, then position determination accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies local quality by creating end sections of the receive coil with different loop area characteristics compared to the middle section. Specifically, the end sections have reduced loop area or are selectively deactivated to compensate for tilting effects at the coil ends, while the middle section maintains full loop area for optimal signal detection. This localized modification allows tilt compensation without requiring multiple separate receive coils, thus improving position accuracy while reducing device complexity.
2Measurement precision
If multiple receive coils with specific configurations are used to eliminate tilting errors, then position determination accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies local quality by creating end sections of the receive coil with different loop area characteristics compared to the middle section. Specifically, the end sections have reduced loop area or are selectively deactivated to compensate for tilting effects at the coil ends, while the middle section maintains full loop area for optimal signal detection. This localized modification allows tilt compensation without requiring multiple separate receive coils, thus improving position accuracy while reducing device complexity.
3Measurement precision
If receive coils are displaced by one half of the scale pitch to eliminate tilting errors, then measurement accuracy is improved, but phase errors are introduced
Solution Approach 1:
The patent applies segmentation by dividing the receive coil into distinct functional sections: end sections with reduced or deactivated loop areas for tilt compensation, and a middle section with full loop area for primary signal detection. This segmentation allows the coil to perform multiple functions (tilt compensation and position detection) simultaneously, eliminating the need for multiple displaced coils and their associated phase error problems.
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 simplifies the sensor device structure, reduces costs, and effectively compensates for misalignments like linear tilting, improving position determination accuracy without introducing phase errors.
Implementation Method 1
A transmit coil and a receive coil are provided. The transmit coil is adapted to create a magnetic field. The magnetic field created by the transmit coil is modified by means of the scale coils.
Implementation Method 2
The receive coil is adapted to detect the field pattern depending on the relative position between the sensor unit and the scale. The receive circuit is adapted to provide a receive signal characterizing the magnetic flux through the loops of the at least one receive coil.
Data Source
AI summary
An inductive sensor device has a scale with scale elements that provide a field pattern in at least one line extending in a measuring direction. The inductive sensor device contains at least one receive circuit with at least one receive coil. The receive coil and the scale are moveable relative to each other in the measuring direction. The receive coil extends from a first end to a second end in the measuring direction. It has a first end section directly adjacent to the first end and a second end section directly adjacent to the second end, and middle section. Each of the sections contains at least one loop of the receive coil. In the end sections the loop area decreases from loop to loop from the loop next to the middle section toward the respective end. Such a loop design compensates for misalignments between the receive coil and the scale.