Movable Permanent Magnets for Tristable Magnetic Field Control
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Solution Overview
Problem
Existing magnetic field generation and control technologies, such as permanent magnets, electromagnets, electropermanent magnets, and superconducting magnets, face challenges in terms of control complexity, energy efficiency, and cost, limiting their practical applications.
Innovation Solution
A tristable system using movably mounted permanent magnets, preferably neodymium magnets, generates three stable magnetic field states through superposition of partial magnetic fields, requiring energy only for switching, and utilizing ferrofluid bearings for low-friction movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If permanent magnets are used to generate magnetic fields, then the apparatus is simple and requires no continuous energy supply, but the magnetic fields cannot be controlled or deactivated
Solution Approach 1:
The patent makes the permanent magnets movable rather than fixed, allowing them to be repositioned into different stable orientations. This dynamic capability enables control of the magnetic field state while maintaining the energy efficiency of permanent magnets, as no continuous energy supply is needed to maintain the field - only to reposition the magnets between states.
Solution Approach 2:
The patent changes the spatial parameter (position/orientation) of the permanent magnets to control the magnetic field. By moving the magnets between discrete stable positions, the system can switch between different magnetic field states (on, off, or different polarities) without requiring continuous energy input, thus resolving the contradiction between control capability and energy efficiency.
2Ease of operation
If electromagnets are used to control magnetic fields precisely, then the magnetic fields can be precisely controlled and deactivated, but continuous energy supply is required to maintain the magnetic field
Solution Approach 1:
The patent extracts the control function from the magnetic field generation itself and separates it into a mechanical repositioning action. The permanent magnets generate the field without energy input, while a separate repositioning mechanism (ferrofluid bearing) enables discrete switching between controlled states. This separation eliminates the need for continuous energy consumption while maintaining control precision.
Solution Approach 2:
Instead of continuous energy supply, the system uses periodic or discrete repositioning actions to switch between magnetic field states. The magnets are moved only when state changes are needed, and once positioned, they remain stable without energy input. This periodic control action dramatically reduces energy consumption compared to continuous electromagnet operation.
3Use of energy by moving object
If electropermanent magnets are used to improve energy efficiency, then energy consumption is reduced compared to electromagnets, but the manufacturing complexity increases due to switching and stabilization requirements
Solution Approach 1:
The patent uses movable permanent magnets that can be repositioned between stable states, achieving energy efficiency similar to electropermanent magnets but with simpler construction. The dynamic repositioning capability is achieved through a ferrofluid bearing, which provides a straightforward implementation compared to the complex switching and stabilization circuits required in electropermanent magnets.
Solution Approach 2:
The patent introduces a ferrofluid bearing as an intermediary mechanism to enable movement and positioning of the permanent magnets. This intermediary provides a simple, reliable method for achieving controlled repositioning without complex electronics or switching mechanisms, thereby reducing manufacturing complexity while maintaining energy efficiency.
4Stability of the object's composition
If superconducting magnets are used to generate strong and stable magnetic fields, then the magnetic fields are strong and stable, but very low temperatures and special materials are required, limiting applications and increasing cost
Solution Approach 1:
The patent uses conventional permanent magnets instead of expensive superconducting materials, accepting that the magnets are simpler and more accessible components. While superconducting magnets provide continuous stability, the permanent magnets achieve sufficient stability for the application through their inherent magnetic properties and controlled repositioning, eliminating the need for costly cryogenic systems and special materials.
Solution Approach 2:
The permanent magnets are self-stabilizing in their positioned states, requiring no external energy input or active control systems to maintain their magnetic field. Once positioned on the ferrofluid bearing, they remain stable without temperature control or additional power supplies, making the system simpler and more broadly applicable than superconducting magnets.
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
Achieves energy-efficient, precise, and interference-free magnetic field control with increased system efficiency and compactness, suitable for space travel and other applications like medical technology, robotics, and economic research.
Implementation Method 1
Each permanent magnet generates a partial magnetic field
Implementation Method 2
The magnetic nanoparticles in the ferrofluid are attracted to the magnetic poles and thus form a cushion that has its own pressure, namely the magnetic pressure of the liquid
Data Source
AI summary
An apparatus for generating and controlling magnetic fields is proposed, which comprises at least two permanent magnets, wherein each permanent magnet generates a partial magnetic field, and wherein the permanent magnets are each movably mounted, so that each permanent magnet can be brought into at least two positions and the apparatus is formed to generate at least three different magnetic field states as a superposition of the partial magnetic fields.