Electromagnetic Separator Drum with AC Solenoids
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromagnetic separators cannot effectively separate ferromagnetic parts containing copper from other ferromagnetic materials, leading to high manual operation costs and efficiency losses due to temperature-related decreases in magnetic field strength over time.
Innovation Solution
An electromagnetic separator with specifically chosen and set operation parameters for solenoids allows for the separation of ferromagnetic parts with negligible or null copper content, stabilizing the magnetic field and magnetomotive force to maintain optimal operation throughout the work cycle, using a drum with raised profiles and solenoids generating a controlled magnetic field to attract and separate materials based on copper content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic separators use conventional solenoids with continuous current, then ferromagnetic parts can be separated from non-ferromagnetic parts, but the magnetic field strength decreases over time due to Joule heating, reducing separation efficiency
Solution Approach 1:
The patent applies periodic action by using alternating current instead of continuous direct current to power the solenoids. The AC power supply creates a time-varying magnetic field that alternates in direction, which prevents the buildup of steady-state eddy currents in the drum and reduces Joule heating effects. This periodic excitation maintains magnetic field strength throughout the work cycle while reducing energy losses compared to continuous DC operation.
Solution Approach 2:
The patent employs parameter changes by varying the frequency and amplitude of the alternating current supplied to the solenoids. By adjusting these electrical parameters, the magnetic field characteristics can be optimized to maintain separation efficiency while minimizing thermal effects. The ability to dynamically adjust current parameters allows the system to compensate for temperature-related resistance changes and maintain stable operation throughout the work cycle.
2Productivity
If electromagnetic separators treat large amounts of material, then throughput is maintained, but manual separation operations are required for copper-containing parts, increasing operational costs
Solution Approach 1:
The patent applies local quality by creating zones with different magnetic field intensities along the drum surface. The raised profiles on the drum create localized regions where magnetic field concentration varies, allowing ferromagnetic parts with different copper contents to be deposited in different zones. This spatial differentiation enables automated or semi-automated collection of copper-containing parts from specific locations, reducing the need for manual inspection and separation while maintaining high throughput.
Solution Approach 2:
The patent uses segmentation by dividing the collection area into distinct zones corresponding to different magnetic attraction strengths. The drum surface is segmented with raised profiles that create discrete deposition regions, allowing the continuous material stream to be automatically sorted into different collection bins based on magnetic response. This segmentation transforms a single-stream processing system into a multi-zone system that reduces manual intervention requirements.
3Measurement precision
If the magnetic field is increased to improve separation of copper-containing parts, then separation precision improves, but energy consumption and heat generation increase
Solution Approach 1:
The patent applies dynamics by using a time-varying magnetic field through AC-powered solenoids instead of a static DC field. The dynamic nature of the alternating magnetic field allows for more efficient separation because it induces eddy currents in conductive materials like copper, creating opposing magnetic fields that enhance separation precision. The dynamic field also reduces net energy consumption compared to maintaining a high constant DC field, as the alternating nature allows energy recovery during field collapse and reduces resistive heating.
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 enables efficient separation of ferromagnetic parts with minimal manual intervention and maintains high separation efficiency by stabilizing the magnetic field and attraction force, reducing energy losses and operational costs.
Implementation Method 1
The inductive magnetic field is generated by means of solenoids connected to a power supply and powered with continuous current
Implementation Method 2
the ferromagnetic parts are subject to the magnetic field produced by the magnetic sector of the drum and are attracted onto the surface of the rotating drum
Implementation Method 3
a plurality of raised profiles 4, which are arranged along the longitudinal direction of the drum parallel to its axis and help to transport the ferromagnetic material attracted by drum 1 on the surface of shell 3 during the drum rotation
Implementation Method 4
During the rotation, the ferromagnetic material attracted onto the cylinder surface of the drum passes beyond the magnetic sector and falls by gravity into a different collection zone
Implementation Method 5
The material is conveyed towards the drum by means of a conveyor, e.g. a conveyor belt, a vibrating plane or a slide
Data Source
Figure 1
AI summary
Electromagnetic separator comprising two or more solenoids (6, 7) arranged inside a rotatable drum (1) and connected to a continuous current power supply (8) for generating a magnetic field suitable for separating ferromagnetic parts, wherein said power supply (8) supplies a current being substantially constant in time. The invention also relates to a separation method that can be carried out by means of said electromagnetic separator.