Inductive Position Sensing Layout for Passive 6-DoF Assemblies
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Solution Overview
Problem
Existing inductive position measuring devices require separate power supplies and data connections for both movable and stationary assemblies, leading to a complex configuration.
Innovation Solution
An inductive position measuring device with a first assembly connected to an active power supply and evaluation electronics, and a second assembly that interacts passively with the first assembly, allowing for position determination in multiple degrees of freedom without an independent power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both movable and stationary assemblies use electrical components connected to active electronics, then position measurement function is achieved, but device complexity increases significantly
Solution Approach 1:
The patent extracts the active electronics from the movable assembly, leaving only passive field interaction devices in the movable assembly while concentrating all active components (power supply, evaluation electronics) in the stationary assembly. This separation eliminates the need for power and data connections in the movable assembly, significantly reducing device complexity while maintaining position measurement functionality.
Solution Approach 2:
The patent introduces electromagnetic fields as an intermediary between the stationary and movable assemblies. The stationary assembly generates electromagnetic fields that interact with passive devices in the movable assembly, enabling position measurement without direct electrical connections to the movable assembly. This intermediary approach allows functional coupling while eliminating complex wiring.
2Adaptability or versatility
If both assemblies have separate power supplies and data connections, then independent operation is enabled, but manufacturing cost increases
Solution Approach 1:
The patent removes the power supply and evaluation electronics from the movable assembly, extracting these expensive components from the moving part. Only passive field interaction devices remain in the movable assembly, dramatically reducing manufacturing cost while the stationary assembly retains all active components needed for operation.
Solution Approach 2:
The stationary assembly serves multiple functions: it generates electromagnetic fields for position measurement, processes signals from the movable assembly, and provides all necessary power. This multi-functionality eliminates the need for separate power supplies in the movable assembly, reducing overall system cost while maintaining operational capability.
3Measurement precision
If multiple field interaction devices are arranged in specific configurations, then position determination in six degrees of freedom is achieved, but device complexity increases
Solution Approach 1:
The patent divides the field interaction devices into two distinct sets: multiple first field interaction devices in the stationary assembly and multiple second field interaction devices in the movable assembly. Each set is arranged in specific configurations (quadrilateral and grid patterns respectively) to enable six-degree-of-freedom position determination. This segmentation allows complex measurement capability while keeping each individual assembly's structure manageable.
Solution Approach 2:
The patent transitions from simple one-dimensional position measurement to six-degree-of-freedom measurement by adding spatial dimensions. The quadrilateral arrangement of first devices and grid arrangement of second devices create multi-dimensional measurement capabilities through their spatial relationships, enabling determination of position and orientation in three-dimensional space without requiring complex individual components.
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
Enables cost-effective production and efficient determination of the position and orientation of movable assemblies in six degrees of freedom by eliminating the need for active power and data connections in both assemblies.
Implementation Method 1
each first field interaction device includes at least one excitation device configured to generate an electromagnetic field and at least one receiver configured to receive an electromagnetic field
Implementation Method 2
at least one receiver configured to receive an electromagnetic field
Data Source
AI summary
An inductive position measuring device includes a first assembly having a first interaction surface and a second assembly having a second interaction surface. The two assemblies are arranged opposite each other in a third direction and are movable relative to each other. The first assembly includes multiple first field interaction devices arranged parallel to the first interaction surface and connected to evaluation electronics. The second assembly includes multiple second field interaction devices arranged in a flat manner distributed over the second interaction surface. The inductive position measuring device includes at least four first field interaction devices in the form of linear sensors arranged as a quadrilateral along a first and second direction, and the first field interaction devices overlap at least partially in the corners of the quadrilateral arrangement.