Dynamic Magnetic Field Stabilization via Movable Elements
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Solution Overview
Problem
Permanent magnet assemblies face challenges in maintaining stable magnetic fields due to temperature variations, requiring substantial thermal insulation and active temperature control, which complicates device design and portability, especially for applications needing high homogeneity.
Innovation Solution
A mechanical mechanism with a sensor and algorithm for dynamically adjusting the position of magnetically active elements within the assembly to stabilize the magnetic field, allowing for continuous correction of field strength fluctuations without degrading homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If thermal insulation and active temperature control are added to maintain magnetic field stability, then magnetic field stability is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback control system where a sensor continuously monitors the magnetic field strength and provides real-time data to a controller. The controller automatically adjusts the position of magnetically active elements to counteract field drift caused by temperature variations, eliminating the need for complex thermal insulation and active temperature control systems.
Solution Approach 2:
The patent replaces thermal management systems (thermal insulation and active temperature control) with a mechanical adjustment system. Movable magnetically active elements are positioned by mechanical actuators based on sensor feedback, substituting the thermal control approach with a direct magnetic field adjustment mechanism.
2Stability of the object's composition
If thermal insulation and active temperature control are added to maintain magnetic field stability, then magnetic field stability is improved, but power consumption increases
Solution Approach 1:
The feedback control system uses power only when field drift is detected. The sensor monitors the magnetic field continuously, and the controller activates actuators only to correct detected deviations, significantly reducing average power consumption compared to continuous active temperature control.
Solution Approach 2:
The system uses the existing magnetic field sensor data to automatically control the magnetically active elements, making the system self-regulating. This eliminates the need for external thermal management power consumption while maintaining field stability through automatic adjustment.
3Adaptability or versatility
If magnetically active elements are made movable for dynamic adjustment, then magnetic field adjustability is improved, but device complexity increases
Solution Approach 1:
The patent introduces movable magnetically active elements that can be dynamically repositioned within the magnetic circuit. These elements are mounted on actuators that allow continuous adjustment of their position, enabling real-time optimization of the magnetic field for different operating conditions and temperature ranges.
Solution Approach 2:
The movable magnetically active elements serve multiple functions: they compensate for temperature-induced field drift, enable optimization of field strength for different applications, and provide adaptability across varying operating conditions. This single mechanism replaces what would otherwise require multiple specialized components.
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 approach enables rapid stabilization of magnetic fields, reducing the need for thermal insulation and power, effectively managing temperature-induced fluctuations and maintaining field stability during operation.
Implementation Method 1
a magnetically active element, the position of which within a regional location alters a magnetic flux path provided by the permanent magnet assembly
Data Source
AI summary
An apparatus and method for dynamically stabilizing the fields in a permanent magnet assembly, including a nuclear magnetic resonance machine. One or more magnetically active elements affect the fields of the magnet assembly. A mechanism controls and changes the position(s) of the magnetically active element(s) to affect and adjust the magnetic field strength in the working volume of the assembly. A sensor provides a control signal indicating the status of the magnetic field strength, and an algorithm is executed for determining, based on the signal, the manner in which the adjustment should be made. The adjustment may be continuous and dynamic, and stabilization of the field may occur during operation of the permanent magnet assembly. The adjustments of the position of the magnetically active element stabilize the field without unduly degrading the field homogeneity, even for high homogeneity magnets.