Programmable Electromagnet Arrays for Stable Touchless Metal Handling
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Solution Overview
Problem
Existing technologies lack programmability and control over magnetic fields for manipulating non-ferrous materials, particularly in applications requiring touchless transportation, heating, and shaping of conductive materials, such as aluminum, which are not effectively addressed by current linear induction motors or inductive heaters.
Innovation Solution
A system comprising multiple independently controlled electromagnets with programmable modulation of magnetic flux density, allowing for touchless transportation, heating, and shaping of conductive materials by generating dynamic magnetic fields using amplitude and phase modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If simple sinusoidal current is input to an electromagnet for sorting, then aluminum can be repelled, but the repulsive force is unstable and lacks keeping forces on the target material
Solution Approach 1:
The electromagnet system is divided into multiple independently controllable coil segments arranged in an array. Each coil can be individually controlled to generate specific magnetic field patterns, allowing creation of stable equilibrium points that provide both repulsive and keeping forces on nonferrous materials.
Solution Approach 2:
The system uses dynamic control of current amplitude and phase in each coil segment to create time-varying magnetic fields. This dynamic control enables the generation of stable repulsive forces with keeping forces, transforming the unstable simple sinusoidal force into a controllable and reliable force field.
2Power
If off-the-shelf induction heaters are used for heating metals, then high frequency sinusoidal power output can be achieved, but there is no option to coordinate with other coils
Solution Approach 1:
The induction heating system is segmented into multiple independently controllable coil units. Each coil can be individually addressed and coordinated with others through programmable control, enabling complex heating patterns and multi-coil coordination that off-the-shelf single-unit heaters cannot provide.
Solution Approach 2:
The electromagnet array system serves multiple functions: it can sort nonferrous materials through repulsive forces, heat conductive materials through induced currents, and shape materials through controlled magnetic fields. This multi-functionality replaces the need for separate specialized devices.
3Ease of operation
If linear induction motors are used for manipulating conductive materials, then touchless transportation is achieved, but there is lack of programmability and control
Solution Approach 1:
The system uses dynamic, programmable control of current amplitude and phase in each coil segment to create reconfigurable magnetic field patterns. This enables the same physical hardware to perform different manipulation tasks through software control, providing high programmability while maintaining touchless transportation capability.
Solution Approach 2:
The system controls multiple parameters including current amplitude, frequency, and phase for each coil independently. By programmatically changing these parameters, the system can adapt to different manipulation requirements for various conductive materials, achieving high versatility and control.
4Force
If simple electromagnet configurations are used, then basic electromagnetic forces are generated, but there is little reprogrammability or control
Solution Approach 1:
The electromagnet is segmented into an array of independently controllable coils. Each coil can be individually programmed and controlled, allowing the system to generate complex, reconfigurable electromagnetic force patterns that can be adapted to different applications through software control.
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
Enables precise control over the manipulation of conductive materials without mechanical contact, achieving efficient recycling, shaping, and heating with high throughput and efficiency, suitable for terrestrial and space applications.
Implementation Method 1
A changing magnetic field induces eddy currents in a conductor, which exerts electromagnetic or Lorentz force opposing the changing magnetic field
Implementation Method 2
Electromagnets are used extensively in a wide variety of manufacturing processes today
Implementation Method 3
Alternating currents in a wire coil create a time-varying magnetic field which induces eddy currents in conductive material. The internal resistance of the material generates heat
Implementation Method 4
A changing magnetic field induces eddy currents in a conductor, which exerts electromagnetic or Lorentz force opposing the changing magnetic field
Data Source
AI summary
A system and method for manipulating or heating conductive material. The system comprises: a first electromagnet; a second electromagnet; the first electromagnet and the second electromagnet each comprising: a body; a first pole, the first pole proximal to a working surface; a second pole, the second pole distal to a working surface; a coil at least partially disposed around the body; a modulating controller configured to selectively apply a current to the first or the second electromagnet; the current configured to produce a time-varying flux density at the first pole; and a working volume in communication with the first pole. Manipulation of the material may be contactless and may include, but is not limited to, rotating, levitating, moving, and/or shaping the conductive material.