Superconducting Coil Alignment for Uniform MRI Magnetic Fields
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Solution Overview
Problem
In MRI devices using superconducting coil devices, achieving high magnetic field uniformity is challenging due to misalignment of the mechanical center and magnetic field center caused by low roundness of the winding part, even with spigot joints, leading to non-uniform magnetic fields.
Innovation Solution
A superconducting coil device design that includes a position adjustment mechanism using a spigot joint with a large-diameter hole and small-diameter hole configuration, allowing for precise alignment of pancake coils to match the magnetic field centers, and a conductive separator to bypass current and reduce heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a spigot joint is provided in the winding frame to improve assembly accuracy, then the assembly precision of pancake coils is improved, but the magnetic field uniformity cannot be achieved due to misalignment between mechanical center and magnetic field center caused by low roundness of winding part
Solution Approach 1:
The spigot joint structure is designed with a large-diameter hole and small-diameter hole configuration, allowing the pancake coils to be adjustable rather than fixed. This dynamic adjustment capability enables alignment of magnetic field centers while accommodating variations in winding part roundness, thus resolving the contradiction between assembly precision and magnetic field uniformity.
Solution Approach 2:
The spigot joint acts as an intermediary mechanism between the winding frame and pancake coils. It provides a mechanical interface that facilitates both precise assembly and subsequent adjustment, mediating between the structural requirements for assembly accuracy and the functional requirements for magnetic field uniformity.
2Power
If pancake coils are stacked and connected to form a superconducting magnet, then the magnetic field strength is improved, but heat generation increases due to current path resistance
Solution Approach 1:
The separator is designed to extract and divert the current path, creating a bypass that separates the main current flow from the resistive connection points between pancake coils. This extraction of current through the separator reduces energy loss and heat generation while maintaining the stacked configuration for achieving high magnetic field strength.
Solution Approach 2:
The conductive separator serves as an intermediary for current flow between stacked pancake coils. By providing a dedicated current path through the separator, it mediates the electrical connection in a way that minimizes resistance and heat generation, enabling the stacking of multiple coils to achieve higher magnetic field strength without proportional increase in energy loss.
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 design achieves uniform magnetic fields by aligning the magnetic field centers of stacked pancake coils and reduces heat generation through current bypassing, enhancing the performance and reliability of the superconducting coil device.
Implementation Method 1
a superconducting coil device includes stacked pancake coils, each of the stacked pancake coils includes an inner frame, a separator disposed outside the inner frame, and a superconducting wire wound part formed on the separator
Implementation Method 2
A superconducting coil device design that includes a position adjustment mechanism using a spigot joint with a large-diameter hole and small-diameter hole configuration, allowing for precise alignment of pancake coils to match the magnetic field centers
Implementation Method 3
a conductive separator to bypass current and reduce heat generation
Data Source
AI summary
A superconducting coil device of an embodiment includes stacked pancake coils. Each of the stacked pancake coils includes an inner frame, a separator disposed outside the inner frame, and a superconducting wire wound part formed on the separator. The superconducting coil device further includes a position adjustment part configured to adjust relative positions of the stacked pancake coils.