Segmented Magnetic Field Generator for Air-Cooled Molten Metal Drive
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Solution Overview
Problem
Conventional magnetic field generation devices for molten metal drive systems require high water-cooling facilities due to increased copper loss, leading to management difficulties and high maintenance costs, hindering their widespread adoption.
Innovation Solution
A magnetic field generation device with ring-shaped or U-shaped iron cores arranged at gaps, featuring a series connection of coils and a specific magnetic pole configuration, which reduces eddy currents and heat generation, allowing for efficient air-cooling and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a large current is caused to flow in the coil to generate a strong moving magnetic field, then the magnetic field strength is improved, but the calorific value (copper loss) of the coil increases requiring powerful water-cooling facilities
Solution Approach 1:
The patent divides the iron core into multiple segments (first to sixth iron cores) arranged at gaps from each other. This segmentation reduces the overall copper loss by optimizing the magnetic path and reducing eddy currents, while still generating a strong moving magnetic field through coordinated energizing of coils wound around each segment.
Solution Approach 2:
The patent applies local quality by creating magnetic pole groups (first to sixth magnetic pole groups) with specific arrangements of magnetic poles on each iron core segment. This local optimization of magnetic field distribution improves overall magnetic field strength while reducing energy losses in specific regions.
2Temperature
If water-cooling facilities are installed to manage coil heat dissipation, then heat dissipation is improved, but water quality management becomes difficult and maintenance cost increases
Solution Approach 1:
The patent extracts the water-cooling system from the design and replaces it with air-cooling. By taking out the complex water quality management and cooling facility requirements, the invention simplifies the overall system while still achieving adequate heat dissipation through the segmented iron core structure that inherently reduces copper loss and heat generation.
3Loss of energy
If multiple iron cores are arranged at gaps from each other to reduce eddy currents, then heat generation is reduced, but the device complexity increases
Solution Approach 1:
The patent merges multiple iron core segments (first to sixth iron cores) into a coordinated system where each segment contributes to the overall moving magnetic field generation. By combining these segments with gaps between them, the design reduces eddy currents and heat generation while maintaining a unified functional structure that doesn't excessively increase complexity.
Solution Approach 2:
Each iron core segment serves multiple functions: it creates local magnetic poles, contributes to the overall moving magnetic field, provides structural support, and facilitates heat dissipation through its gap-separated arrangement. This multi-functionality reduces the need for additional components, thereby controlling overall device complexity.
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 the generation of a strong magnetic field with improved heat dissipation, reducing maintenance costs and weight, while maintaining magnetic field strength, and allowing for easier handling and installation.
Implementation Method 1
a magnetic field generation device (AC magnetic field device) that is supplied with an AC current and generates a moving magnetic field
Implementation Method 2
When the moving magnetic field runs in the molten metal, an eddy current is generated in the molten metal, an electromagnetic force acts on the molten metal by the eddy current
Implementation Method 3
an electromagnetic force acts on the molten metal by the eddy current, and the molten metal is driven
Data Source
AI summary
A magnetic field generation device according to an embodiment includes a plurality of iron cores arranged at gaps from each other, coils and for energizing an R-phase current, coils for energizing an S-phase current, and coils for energizing a T-phase current. The magnetic poles of each iron core are arranged along a predetermined direction to constitute first to sixth magnetic pole groups, respectively. The coils are wound around each of the first to sixth magnetic pole groups.