Sensor Lead Wire Routing to Reduce Magnetic Coupling
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Solution Overview
Problem
Existing position detection devices face issues with magnetic coupling between lead wires and coils, requiring oblique coil formation for reduced coupling, which complicates coordinate transformation, and necessitate multiple wiring layers, increasing production costs and parasitic resistance differences among coils, affecting accurate position detection.
Innovation Solution
A sensor design with lead wires arranged at an angle to both coil directions in a single layer, minimizing magnetic coupling and parasitic resistance differences by optimizing lead wire connections and coil configurations, allowing accurate position detection without oblique coil formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If lead wires are arranged parallel to coils to simplify wiring, then wiring complexity is reduced, but magnetic coupling between lead wires and coils increases causing signal superposition
Solution Approach 1:
The patent extracts the lead wire routing from the conventional parallel arrangement to an oblique arrangement at a predetermined angle (e.g., 45 degrees) relative to the coil extending direction. This separation of the lead wire path from the coil path reduces the magnetic coupling between them while maintaining wiring simplicity through systematic angular orientation.
Solution Approach 2:
The patent introduces an angular orientation (predetermined angle) as an intermediary parameter between the lead wire and coil directions. This angular relationship serves as a mediator that reduces magnetic coupling without requiring complex multi-layer wiring, thus resolving the contradiction between wiring simplicity and magnetic coupling reduction.
2Object-generated harmful factors
If coils are formed obliquely to reduce magnetic coupling, then magnetic coupling is reduced, but coordinate transformation is required complicating position calculation
Solution Approach 1:
Instead of obliquely forming the coils (which would require coordinate transformation), the patent inverts the approach by keeping the coils in standard orthogonal alignment and obliquely arranging the lead wires connected to them. This inversion maintains simple coordinate systems while achieving the same magnetic coupling reduction effect.
3Object-generated harmful factors
If lead wires are arranged obliquely to reduce magnetic coupling, then magnetic coupling is reduced, but two wiring layers are required increasing production cost
Solution Approach 1:
The patent resolves the layering issue by utilizing the planar dimension efficiently - lead wires extending in opposite directions from the same coil are routed in opposite oblique directions within the same wiring layer. This dimensional arrangement allows oblique routing without requiring additional wiring layers, thus reducing production costs while maintaining magnetic coupling reduction.
4Ease of manufacture
If lead wires are arranged obliquely in one layer, then production cost is reduced, but parasitic resistance differences among coils increase affecting position detection accuracy
Solution Approach 1:
The patent controls the parasitic resistance differences by carefully selecting and maintaining a predetermined angle (e.g., 45 degrees) for lead wire orientation. This parameter control ensures that lead wires of adjacent coils have comparable lengths, thereby minimizing parasitic resistance variations and maintaining position detection accuracy while using single-layer wiring.
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 reduces magnetic coupling and production costs, enables accurate position detection by minimizing parasitic resistance differences among coils, and allows for single-layer wiring of obliquely disposed lead wires, improving the overall efficiency and accuracy of position detection.
Implementation Method 1
a position detection device which detects, through a sensor, an alternating magnetic field sent from a position indicator
Implementation Method 2
an electro-magnetic resonance (EMR) (registered trademark) system, which causes power to be generated in the position indicator through an electromagnetic wave sent through the sensor from the position detection device
Data Source
AI summary
A sensor includes a plurality of coils including a plurality of first coils each extending in a first direction, and a plurality of second coils each extending in a second direction, a plurality of terminals provided for one ends and other ends of the plurality of coils, and a plurality of lead wires which connect the plurality of terminals to the corresponding one ends or other ends of the plurality of coils. The plurality of lead wires are arranged to extend along any of one or more directions which are at an angle relative to both the first direction and the second direction.