Inductive Position Sensor Coil Layout for Dead Band-Free Welding Control
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Solution Overview
Problem
Conventional welding systems using potentiometers and switches for on/off and output control face issues with dead band wastage, mechanical tolerance stack-up, and susceptibility to common-mode interference, leading to reduced reliability and increased costs.
Innovation Solution
The use of inductive sensors with non-uniformly spaced coils, where a conductive target's movement along the coils changes resonant frequencies, allowing for both switching and potentiometer functions, reducing dead band issues and common-mode interference through dual-coil or single-coil configurations with specific geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional potentiometers and switches are used for welding control, then on/off switching and output control functions are achieved, but dead band wastage and mechanical tolerance stack-up occur reducing reliability
Solution Approach 1:
The patent replaces mechanical potentiometers and switches with an inductive sensor system that uses electromagnetic fields to detect the position of a conductive target. This substitution eliminates mechanical contact, dead band wastage, and mechanical tolerance stack-up, thereby improving control reliability while maintaining both on/off switching and output control functions.
Solution Approach 2:
The patent introduces a conductive target as an intermediary element that moves within the magnetic field of the inductive sensor. This intermediary allows the system to detect position changes without direct mechanical contact between the sensor and the control mechanism, eliminating dead band issues and mechanical wear while preserving switching and control capabilities.
2Measurement precision
If conventional switches and potentiometers are used, then control functions are achieved, but mechanical tolerance stack-up reduces precision
Solution Approach 1:
The patent replaces the complex mechanical assembly of switches and potentiometers with a simplified inductive sensor system. The electromagnetic field-based detection eliminates mechanical tolerance stack-up, providing higher position detection precision without the complexity of multiple mechanical components and their associated tolerances.
3Reliability
If conventional mechanical control systems are used, then switching and control functions are achieved, but susceptibility to common-mode interference increases
Solution Approach 1:
The patent replaces mechanical control systems with an inductive sensing system that uses electromagnetic fields. This substitution eliminates susceptibility to common-mode interference that affects mechanical and electrical contact-based systems, improving control stability and reliability in electrically noisy welding environments.
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 solution provides reliable and cost-effective switching and control in welding systems by eliminating dead band wastage and common-mode errors, enhancing the reliability and efficiency of welding control mechanisms.
Implementation Method 1
inductive sensors with non-uniformly spaced coils, where a conductive target's movement along the coils changes resonant frequencies
Implementation Method 2
inductive position sensor with switch function
Implementation Method 3
a conductive target's movement along the coils changes resonant frequencies
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
An inductive sensor which includes one or more inductive coils and an inductance to digital converter. The output of the inductive sensor may be used to replace the functions of a switch and a potentiometer to initiate and control various outputs in welding-type systems and applications.