Inductive Ruler Position Detection via Alternating Magnetic Field

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Solution Overview

Problem

Magnetic rulers face challenges in precision and stability due to the need for thinning magnetic pole widths and issues with voltage phase shift, making them less precise and prone to assembly control problems, which hinders their scalability in high-end applications.

Innovation Solution

A magnetic position detecting device comprising an exciting element generating an alternating magnetic field, an inductive ruler with a pattern that generates an inductive voltage based on position changes, and a position resolving element that captures and processes this voltage to determine the position of the exciting element on the inductive ruler.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the magnetic pole width is thinned or miniaturized to improve position detection precision, then measurement precision is improved, but manufacturing complexity and assembly control difficulty increase

Engineering Contradiction:

Improveposition detection precisionVSAvoidassembly control difficulty

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces the traditional magnetic pole structure with an inductive ruler pattern that uses electromagnetic induction principles. Instead of relying on thin magnetic poles that require precise mechanical assembly, the system uses an exciting element to generate an alternating magnetic field that induces voltages in the inductive ruler pattern, enabling position detection through electrical signals rather than mechanical precision

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the detection parameter from direct magnetic field sensing by thin poles to voltage phase shift measurement in an inductive pattern. By measuring the phase difference between induced voltages at different positions, the system achieves high precision without requiring thin magnetic pole structures

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If the magnetic pole width is thinned or miniaturized to improve position detection precision, then measurement precision is improved, but stability deteriorates due to voltage phase shift issues

Engineering Contradiction:

Improveposition detection precisionVSAvoidstability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent replaces the unstable thin magnetic pole structure with a robust inductive pattern system that uses electromagnetic induction. The exciting element generates an alternating magnetic field that induces voltages in the inductive ruler, and position is determined by voltage phase shift rather than physical magnetic pole dimensions, eliminating the stability issues associated with thin magnetic poles

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If traditional magnetization processes are used to create high-order magnetic rulers, then measurement precision can be improved, but productivity decreases due to time-consuming magnetization

Engineering Contradiction:

Improvehigh-order detection precisionVSAvoidmanufacturing speed

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent replaces the time-consuming magnetization process with a direct fabrication of inductive patterns. Instead of magnetizing materials to create magnetic poles, the system fabricates conductive patterns on the inductive ruler that respond to the exciting element's magnetic field, eliminating the slow magnetization step while maintaining high detection precision

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fabrication approach from magnetic material processing to conductive pattern fabrication. By using standard printing or deposition techniques to create the inductive pattern rather than magnetization processes, the system achieves high precision detection with significantly improved manufacturing efficiency

Inventive Principle:

Principle #35Parameter changes

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 improves position detection precision and stability, allowing for easier scaling of magnetic rulers and addressing issues of time-consuming magnetization and voltage phase shift resolution, thereby enhancing the scalability and accuracy of magnetic position detection.

Implementation Method 1

an exciting element configured for generating an alternating magnetic field; an inductive ruler with a pattern and generating an inductive voltage based on a relative position change between the pattern and the exciting element

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS10948315B2Magnetic position detecting device and method

Publication Date: 2021.03.16 IND TECH RES INST

AI summary

A magnetic position detecting device and a method for detecting a magnetic position are provided. An induced voltage is generated by changing a position between a pattern of an inductive ruler and an alternating magnetic field of an exciting element. A position of the exciting element is resolved by a technical means of voltage resolution for positions.