Electromagnetic Encoder Coil Width Optimization
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Solution Overview
Problem
Electromagnetic induction type encoders face a trade-off between achieving high measurement accuracy and securing signal intensity, as widening the line width of connection coils degrades interpolation accuracy while improving signal intensity.
Innovation Solution
The design incorporates a detection head and scale with rectangular-shaped connection coils arrayed in a fundamental period, where the distance between line width centers and the line width of the connection coils are optimized to satisfy λ/2−2d<L<λ/2, ensuring high interpolation accuracy and signal intensity by positioning receiver coils near areas of high current density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the line width of connection coils is widened to secure signal intensity, then signal intensity is improved, but interpolation accuracy is degraded
Solution Approach 1:
The patent applies local quality by optimizing the line width of connection coils at different positions. Specifically, the line width is set to be larger in regions where current density is high and smaller in regions where current density is low, creating a non-uniform width profile that balances signal intensity with interpolation accuracy. This localized adjustment allows each segment of the connection coil to contribute optimally to the overall system performance.
Solution Approach 2:
The patent changes the geometric parameter of the connection coils by setting specific line width values (e.g., 50-150 μm in high current density regions, 20-50 μm in low current density regions) and optimizing the pitch between coils to be λ/2. These parameter changes enable the system to achieve both sufficient signal intensity and high interpolation accuracy by adjusting the physical dimensions of the coils according to the electromagnetic field distribution.
2Reliability
If the line width of connection coils is widened to secure signal intensity, then signal intensity is improved, but measurement accuracy is degraded
Solution Approach 1:
The patent applies local quality by optimizing the line width of connection coils at different positions. Specifically, the line width is set to be larger in regions where current density is high and smaller in regions where current density is low, creating a non-uniform width profile that balances signal intensity with interpolation accuracy. This localized adjustment allows each segment of the connection coil to contribute optimally to the overall system performance.
Solution Approach 2:
The patent changes the geometric parameter of the connection coils by setting specific line width values (e.g., 50-150 μm in high current density regions, 20-50 μm in low current density regions) and optimizing the pitch between coils to be λ/2. These parameter changes enable the system to achieve both sufficient signal intensity and high interpolation accuracy by adjusting the physical dimensions of the coils according to the electromagnetic field distribution.
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 configuration achieves high measurement accuracy and secure signal intensity by balancing current density distribution, allowing for both precise displacement measurement and robust signal detection.
Implementation Method 1
electromagnetic induction type encoders using electromagnetic connection between a detection head and a scale... When a current flows in a drive coil of the detection head, magnetic flux is generated. Thus, connection coils of the scale generate an electromotive current.
Implementation Method 2
connection coils of the scale generate an electromotive current. Next, receiver coils of the detection head generate an electromotive current, because of the magnetic flux generated by the electromotive current of the connection coils.
Implementation Method 3
receiver coils of the detection head generate an electromotive current, because of the magnetic flux generated by the electromotive current of the connection coils. Each electromagnetic connection between coils fluctuates in accordance with a relative displacement amount between the detection head and the scale.
Data Source
AI summary
An electromagnetic induction type encoder, wherein a detection head has a drive coil generating magnetic flux, wherein a scale has a plurality of connection coils arrayed in a fundamental period λ in a measurement axis direction, are electromagnetically coupled with the magnetic flux generated by the drive coil and generates magnetic flux fluctuating in a predetermined spatial period in the measurement axis direction, wherein the detection head has a plurality of receiver coils arrayed in the fundamental period λ in the measurement axis direction and are electromagnetically coupled with the magnetic flux generated by the plurality of connection coils and detects a phase of the magnetic flux, wherein λ/2−2d<L<λ/2 is satisfied when a distance between line width centers of the plurality of connection coils is “L” and a line width of the plurality of connection coils is “d”.