Ferromagnetic Field Concentrator for Low-Stray Magnetizing Regions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing magnetizing devices for testing value documents with magnetizable security elements suffer from a large stray field, which requires stronger and more expensive magnets, and can interfere with magnetic field sensors due to the lack of field concentration.
Innovation Solution
A magnetizing device comprising a magnet and a magnetic field concentrator made of ferromagnetic material, such as soft iron, positioned to amplify and focus the magnetic field within the magnetization region, reducing the stray field and allowing for more efficient magnetization with smaller magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnets are made stronger to overcome stray field losses, then magnetization effectiveness is improved, but device cost and complexity increase
Solution Approach 1:
A magnetic field concentrator made of ferromagnetic material is introduced as an intermediary component between the magnet and the security element. This concentrator guides and concentrates the magnetic field lines into the magnetization region, reducing stray field losses without requiring stronger magnets. The concentrator acts as a mediator that improves field utilization efficiency while keeping the magnet strength and device cost moderate.
Solution Approach 2:
The invention changes the magnetic field distribution parameters by introducing a ferromagnetic concentrator with specific permeability properties. This modifies how the magnetic field is distributed in space, concentrating it in the desired region and reducing stray fields. The parameter change in field distribution achieves better magnetization effectiveness without increasing magnet strength.
2Force
If magnets are made stronger to compensate for stray field, then magnetic field strength in target region is improved, but sensor interference increases
Solution Approach 1:
The magnetic field concentrator serves as an intermediary that shapes and directs the magnetic field. It confines the magnetic field lines primarily to the magnetization region, preventing excessive field spread that would interfere with sensors. The concentrator mediates between the magnet and the environment, providing strong localized field while minimizing harmful stray fields affecting sensors.
Solution Approach 2:
The invention applies local quality by creating a highly concentrated magnetic field in the specific magnetization region while maintaining low field strength in surrounding areas. The ferromagnetic concentrator provides different magnetic properties in different spatial locations: high permeability and field concentration in the target region, and field confinement elsewhere. This local field differentiation achieves strong magnetization without sensor interference.
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 effectively reduces the need for expensive magnets by concentrating the magnetic field, enhancing the detection of magnetic regions and minimizing sensor interference.
Implementation Method 1
The magnetic field concentrator is formed of a ferromagnetic material. The magnetic field concentrator is arranged in the magnetic field and amplifies and focuses the magnetic field in the magnetization region.
Data Source
AI summary
A magnetizing device includes a magnet and a magnetic field concentrator. The magnet has a magnetic field forming a magnetization region in which a magnetizable security element is exposed to a magnetic field strength having a defined magnetic field direction. The magnetic field concentrator is formed of a ferromagnetic material. The magnetic field concentrator is arranged in the magnetic field and amplifies and focuses the magnetic field in the magnetization region.